Commit | Line | Data |
---|---|---|
af1a8899 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * raid1.c : Multiple Devices driver for Linux | |
4 | * | |
5 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
6 | * | |
7 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
8 | * | |
9 | * RAID-1 management functions. | |
10 | * | |
11 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
12 | * | |
96de0e25 | 13 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
14 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
15 | * | |
191ea9b2 N |
16 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
17 | * bitmapped intelligence in resync: | |
18 | * | |
19 | * - bitmap marked during normal i/o | |
20 | * - bitmap used to skip nondirty blocks during sync | |
21 | * | |
22 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
23 | * - persistent bitmap code | |
1da177e4 LT |
24 | */ |
25 | ||
5a0e3ad6 | 26 | #include <linux/slab.h> |
25570727 | 27 | #include <linux/delay.h> |
bff61975 | 28 | #include <linux/blkdev.h> |
056075c7 | 29 | #include <linux/module.h> |
bff61975 | 30 | #include <linux/seq_file.h> |
8bda470e | 31 | #include <linux/ratelimit.h> |
3f07c014 | 32 | |
109e3765 | 33 | #include <trace/events/block.h> |
3f07c014 | 34 | |
43b2e5d8 | 35 | #include "md.h" |
ef740c37 | 36 | #include "raid1.h" |
935fe098 | 37 | #include "md-bitmap.h" |
191ea9b2 | 38 | |
394ed8e4 SL |
39 | #define UNSUPPORTED_MDDEV_FLAGS \ |
40 | ((1L << MD_HAS_JOURNAL) | \ | |
ea0213e0 | 41 | (1L << MD_JOURNAL_CLEAN) | \ |
ddc08823 PB |
42 | (1L << MD_HAS_PPL) | \ |
43 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 44 | |
fd76863e | 45 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr); |
46 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr); | |
1da177e4 | 47 | |
578b54ad N |
48 | #define raid1_log(md, fmt, args...) \ |
49 | do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) | |
50 | ||
fb0eb5df ML |
51 | #include "raid1-10.c" |
52 | ||
3e148a32 GJ |
53 | static int check_and_add_wb(struct md_rdev *rdev, sector_t lo, sector_t hi) |
54 | { | |
55 | struct wb_info *wi, *temp_wi; | |
56 | unsigned long flags; | |
57 | int ret = 0; | |
58 | struct mddev *mddev = rdev->mddev; | |
59 | ||
60 | wi = mempool_alloc(mddev->wb_info_pool, GFP_NOIO); | |
61 | ||
62 | spin_lock_irqsave(&rdev->wb_list_lock, flags); | |
63 | list_for_each_entry(temp_wi, &rdev->wb_list, list) { | |
64 | /* collision happened */ | |
65 | if (hi > temp_wi->lo && lo < temp_wi->hi) { | |
66 | ret = -EBUSY; | |
67 | break; | |
68 | } | |
69 | } | |
70 | ||
71 | if (!ret) { | |
72 | wi->lo = lo; | |
73 | wi->hi = hi; | |
74 | list_add(&wi->list, &rdev->wb_list); | |
75 | } else | |
76 | mempool_free(wi, mddev->wb_info_pool); | |
77 | spin_unlock_irqrestore(&rdev->wb_list_lock, flags); | |
78 | ||
79 | return ret; | |
80 | } | |
81 | ||
82 | static void remove_wb(struct md_rdev *rdev, sector_t lo, sector_t hi) | |
83 | { | |
84 | struct wb_info *wi; | |
85 | unsigned long flags; | |
86 | int found = 0; | |
87 | struct mddev *mddev = rdev->mddev; | |
88 | ||
89 | spin_lock_irqsave(&rdev->wb_list_lock, flags); | |
90 | list_for_each_entry(wi, &rdev->wb_list, list) | |
91 | if (hi == wi->hi && lo == wi->lo) { | |
92 | list_del(&wi->list); | |
93 | mempool_free(wi, mddev->wb_info_pool); | |
94 | found = 1; | |
95 | break; | |
96 | } | |
97 | ||
98 | if (!found) | |
16d4b746 | 99 | WARN(1, "The write behind IO is not recorded\n"); |
3e148a32 GJ |
100 | spin_unlock_irqrestore(&rdev->wb_list_lock, flags); |
101 | wake_up(&rdev->wb_io_wait); | |
102 | } | |
103 | ||
98d30c58 ML |
104 | /* |
105 | * for resync bio, r1bio pointer can be retrieved from the per-bio | |
106 | * 'struct resync_pages'. | |
107 | */ | |
108 | static inline struct r1bio *get_resync_r1bio(struct bio *bio) | |
109 | { | |
110 | return get_resync_pages(bio)->raid_bio; | |
111 | } | |
112 | ||
dd0fc66f | 113 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
114 | { |
115 | struct pool_info *pi = data; | |
9f2c9d12 | 116 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
117 | |
118 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 119 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
120 | } |
121 | ||
8e005f7c | 122 | #define RESYNC_DEPTH 32 |
1da177e4 | 123 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 124 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
125 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
126 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
127 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 128 | |
dd0fc66f | 129 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
130 | { |
131 | struct pool_info *pi = data; | |
9f2c9d12 | 132 | struct r1bio *r1_bio; |
1da177e4 | 133 | struct bio *bio; |
da1aab3d | 134 | int need_pages; |
98d30c58 ML |
135 | int j; |
136 | struct resync_pages *rps; | |
1da177e4 LT |
137 | |
138 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 139 | if (!r1_bio) |
1da177e4 | 140 | return NULL; |
1da177e4 | 141 | |
6da2ec56 KC |
142 | rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), |
143 | gfp_flags); | |
98d30c58 ML |
144 | if (!rps) |
145 | goto out_free_r1bio; | |
146 | ||
1da177e4 LT |
147 | /* |
148 | * Allocate bios : 1 for reading, n-1 for writing | |
149 | */ | |
150 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 151 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
152 | if (!bio) |
153 | goto out_free_bio; | |
154 | r1_bio->bios[j] = bio; | |
155 | } | |
156 | /* | |
157 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
158 | * the first bio. |
159 | * If this is a user-requested check/repair, allocate | |
160 | * RESYNC_PAGES for each bio. | |
1da177e4 | 161 | */ |
d11c171e | 162 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 163 | need_pages = pi->raid_disks; |
d11c171e | 164 | else |
da1aab3d | 165 | need_pages = 1; |
98d30c58 ML |
166 | for (j = 0; j < pi->raid_disks; j++) { |
167 | struct resync_pages *rp = &rps[j]; | |
168 | ||
d11c171e | 169 | bio = r1_bio->bios[j]; |
d11c171e | 170 | |
98d30c58 ML |
171 | if (j < need_pages) { |
172 | if (resync_alloc_pages(rp, gfp_flags)) | |
173 | goto out_free_pages; | |
174 | } else { | |
175 | memcpy(rp, &rps[0], sizeof(*rp)); | |
176 | resync_get_all_pages(rp); | |
177 | } | |
178 | ||
98d30c58 ML |
179 | rp->raid_bio = r1_bio; |
180 | bio->bi_private = rp; | |
1da177e4 LT |
181 | } |
182 | ||
183 | r1_bio->master_bio = NULL; | |
184 | ||
185 | return r1_bio; | |
186 | ||
da1aab3d | 187 | out_free_pages: |
491221f8 | 188 | while (--j >= 0) |
98d30c58 | 189 | resync_free_pages(&rps[j]); |
da1aab3d | 190 | |
1da177e4 | 191 | out_free_bio: |
8f19ccb2 | 192 | while (++j < pi->raid_disks) |
1da177e4 | 193 | bio_put(r1_bio->bios[j]); |
98d30c58 ML |
194 | kfree(rps); |
195 | ||
196 | out_free_r1bio: | |
c7afa803 | 197 | rbio_pool_free(r1_bio, data); |
1da177e4 LT |
198 | return NULL; |
199 | } | |
200 | ||
201 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
202 | { | |
203 | struct pool_info *pi = data; | |
98d30c58 | 204 | int i; |
9f2c9d12 | 205 | struct r1bio *r1bio = __r1_bio; |
98d30c58 | 206 | struct resync_pages *rp = NULL; |
1da177e4 | 207 | |
98d30c58 ML |
208 | for (i = pi->raid_disks; i--; ) { |
209 | rp = get_resync_pages(r1bio->bios[i]); | |
210 | resync_free_pages(rp); | |
1da177e4 | 211 | bio_put(r1bio->bios[i]); |
98d30c58 ML |
212 | } |
213 | ||
214 | /* resync pages array stored in the 1st bio's .bi_private */ | |
215 | kfree(rp); | |
1da177e4 | 216 | |
c7afa803 | 217 | rbio_pool_free(r1bio, data); |
1da177e4 LT |
218 | } |
219 | ||
e8096360 | 220 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
221 | { |
222 | int i; | |
223 | ||
8f19ccb2 | 224 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 225 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 226 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
227 | bio_put(*bio); |
228 | *bio = NULL; | |
229 | } | |
230 | } | |
231 | ||
9f2c9d12 | 232 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 233 | { |
e8096360 | 234 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 235 | |
1da177e4 | 236 | put_all_bios(conf, r1_bio); |
afeee514 | 237 | mempool_free(r1_bio, &conf->r1bio_pool); |
1da177e4 LT |
238 | } |
239 | ||
9f2c9d12 | 240 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 241 | { |
e8096360 | 242 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 243 | sector_t sect = r1_bio->sector; |
3e198f78 N |
244 | int i; |
245 | ||
8f19ccb2 | 246 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
247 | struct bio *bio = r1_bio->bios[i]; |
248 | if (bio->bi_end_io) | |
249 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
250 | } | |
1da177e4 | 251 | |
afeee514 | 252 | mempool_free(r1_bio, &conf->r1buf_pool); |
1da177e4 | 253 | |
af5f42a7 | 254 | lower_barrier(conf, sect); |
1da177e4 LT |
255 | } |
256 | ||
9f2c9d12 | 257 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
258 | { |
259 | unsigned long flags; | |
fd01b88c | 260 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 261 | struct r1conf *conf = mddev->private; |
fd76863e | 262 | int idx; |
1da177e4 | 263 | |
fd76863e | 264 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
265 | spin_lock_irqsave(&conf->device_lock, flags); |
266 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 267 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
268 | spin_unlock_irqrestore(&conf->device_lock, flags); |
269 | ||
17999be4 | 270 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
271 | md_wakeup_thread(mddev->thread); |
272 | } | |
273 | ||
274 | /* | |
275 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
276 | * operation and are ready to return a success/failure code to the buffer | |
277 | * cache layer. | |
278 | */ | |
9f2c9d12 | 279 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
280 | { |
281 | struct bio *bio = r1_bio->master_bio; | |
e8096360 | 282 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
283 | |
284 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4e4cbee9 | 285 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 286 | |
37011e3a N |
287 | bio_endio(bio); |
288 | /* | |
289 | * Wake up any possible resync thread that waits for the device | |
290 | * to go idle. | |
291 | */ | |
292 | allow_barrier(conf, r1_bio->sector); | |
d2eb35ac N |
293 | } |
294 | ||
9f2c9d12 | 295 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
296 | { |
297 | struct bio *bio = r1_bio->master_bio; | |
298 | ||
4b6d287f N |
299 | /* if nobody has done the final endio yet, do it now */ |
300 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
301 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
302 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
303 | (unsigned long long) bio->bi_iter.bi_sector, |
304 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 305 | |
d2eb35ac | 306 | call_bio_endio(r1_bio); |
4b6d287f | 307 | } |
1da177e4 LT |
308 | free_r1bio(r1_bio); |
309 | } | |
310 | ||
311 | /* | |
312 | * Update disk head position estimator based on IRQ completion info. | |
313 | */ | |
9f2c9d12 | 314 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 315 | { |
e8096360 | 316 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
317 | |
318 | conf->mirrors[disk].head_position = | |
319 | r1_bio->sector + (r1_bio->sectors); | |
320 | } | |
321 | ||
ba3ae3be NK |
322 | /* |
323 | * Find the disk number which triggered given bio | |
324 | */ | |
9f2c9d12 | 325 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
326 | { |
327 | int mirror; | |
30194636 N |
328 | struct r1conf *conf = r1_bio->mddev->private; |
329 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 330 | |
8f19ccb2 | 331 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
332 | if (r1_bio->bios[mirror] == bio) |
333 | break; | |
334 | ||
8f19ccb2 | 335 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
336 | update_head_pos(mirror, r1_bio); |
337 | ||
338 | return mirror; | |
339 | } | |
340 | ||
4246a0b6 | 341 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 342 | { |
4e4cbee9 | 343 | int uptodate = !bio->bi_status; |
9f2c9d12 | 344 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 345 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 346 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 347 | |
1da177e4 LT |
348 | /* |
349 | * this branch is our 'one mirror IO has finished' event handler: | |
350 | */ | |
e5872d58 | 351 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 352 | |
dd00a99e N |
353 | if (uptodate) |
354 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
355 | else if (test_bit(FailFast, &rdev->flags) && |
356 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
357 | /* This was a fail-fast read so we definitely | |
358 | * want to retry */ | |
359 | ; | |
dd00a99e N |
360 | else { |
361 | /* If all other devices have failed, we want to return | |
362 | * the error upwards rather than fail the last device. | |
363 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 364 | */ |
dd00a99e N |
365 | unsigned long flags; |
366 | spin_lock_irqsave(&conf->device_lock, flags); | |
367 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
368 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 369 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
370 | uptodate = 1; |
371 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
372 | } | |
1da177e4 | 373 | |
7ad4d4a6 | 374 | if (uptodate) { |
1da177e4 | 375 | raid_end_bio_io(r1_bio); |
e5872d58 | 376 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 377 | } else { |
1da177e4 LT |
378 | /* |
379 | * oops, read error: | |
380 | */ | |
381 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
382 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
383 | mdname(conf->mddev), | |
384 | bdevname(rdev->bdev, b), | |
385 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 386 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 387 | reschedule_retry(r1_bio); |
7ad4d4a6 | 388 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 389 | } |
1da177e4 LT |
390 | } |
391 | ||
9f2c9d12 | 392 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
393 | { |
394 | /* it really is the end of this request */ | |
395 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
396 | bio_free_pages(r1_bio->behind_master_bio); |
397 | bio_put(r1_bio->behind_master_bio); | |
398 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
399 | } |
400 | /* clear the bitmap if all writes complete successfully */ | |
e64e4018 AS |
401 | md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
402 | r1_bio->sectors, | |
403 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
404 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
cd5ff9a1 N |
405 | md_write_end(r1_bio->mddev); |
406 | } | |
407 | ||
9f2c9d12 | 408 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 409 | { |
cd5ff9a1 N |
410 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
411 | return; | |
412 | ||
413 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
414 | reschedule_retry(r1_bio); | |
415 | else { | |
416 | close_write(r1_bio); | |
4367af55 N |
417 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
418 | reschedule_retry(r1_bio); | |
419 | else | |
420 | raid_end_bio_io(r1_bio); | |
4e78064f N |
421 | } |
422 | } | |
423 | ||
4246a0b6 | 424 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 425 | { |
9f2c9d12 | 426 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 427 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 428 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 429 | struct bio *to_put = NULL; |
e5872d58 N |
430 | int mirror = find_bio_disk(r1_bio, bio); |
431 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
432 | bool discard_error; |
433 | ||
4e4cbee9 | 434 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 435 | |
e9c7469b TH |
436 | /* |
437 | * 'one mirror IO has finished' event handler: | |
438 | */ | |
4e4cbee9 | 439 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
440 | set_bit(WriteErrorSeen, &rdev->flags); |
441 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
442 | set_bit(MD_RECOVERY_NEEDED, & |
443 | conf->mddev->recovery); | |
444 | ||
212e7eb7 N |
445 | if (test_bit(FailFast, &rdev->flags) && |
446 | (bio->bi_opf & MD_FAILFAST) && | |
447 | /* We never try FailFast to WriteMostly devices */ | |
448 | !test_bit(WriteMostly, &rdev->flags)) { | |
449 | md_error(r1_bio->mddev, rdev); | |
450 | if (!test_bit(Faulty, &rdev->flags)) | |
451 | /* This is the only remaining device, | |
452 | * We need to retry the write without | |
453 | * FailFast | |
454 | */ | |
455 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
456 | else { | |
457 | /* Finished with this branch */ | |
458 | r1_bio->bios[mirror] = NULL; | |
459 | to_put = bio; | |
460 | } | |
461 | } else | |
462 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 463 | } else { |
1da177e4 | 464 | /* |
e9c7469b TH |
465 | * Set R1BIO_Uptodate in our master bio, so that we |
466 | * will return a good error code for to the higher | |
467 | * levels even if IO on some other mirrored buffer | |
468 | * fails. | |
469 | * | |
470 | * The 'master' represents the composite IO operation | |
471 | * to user-side. So if something waits for IO, then it | |
472 | * will wait for the 'master' bio. | |
1da177e4 | 473 | */ |
4367af55 N |
474 | sector_t first_bad; |
475 | int bad_sectors; | |
476 | ||
cd5ff9a1 N |
477 | r1_bio->bios[mirror] = NULL; |
478 | to_put = bio; | |
3056e3ae AL |
479 | /* |
480 | * Do not set R1BIO_Uptodate if the current device is | |
481 | * rebuilding or Faulty. This is because we cannot use | |
482 | * such device for properly reading the data back (we could | |
483 | * potentially use it, if the current write would have felt | |
484 | * before rdev->recovery_offset, but for simplicity we don't | |
485 | * check this here. | |
486 | */ | |
e5872d58 N |
487 | if (test_bit(In_sync, &rdev->flags) && |
488 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 489 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 490 | |
4367af55 | 491 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 492 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 493 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
494 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
495 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
496 | } | |
497 | } | |
498 | ||
e9c7469b | 499 | if (behind) { |
3e148a32 GJ |
500 | if (test_bit(WBCollisionCheck, &rdev->flags)) { |
501 | sector_t lo = r1_bio->sector; | |
502 | sector_t hi = r1_bio->sector + r1_bio->sectors; | |
503 | ||
504 | remove_wb(rdev, lo, hi); | |
505 | } | |
e5872d58 | 506 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
507 | atomic_dec(&r1_bio->behind_remaining); |
508 | ||
509 | /* | |
510 | * In behind mode, we ACK the master bio once the I/O | |
511 | * has safely reached all non-writemostly | |
512 | * disks. Setting the Returned bit ensures that this | |
513 | * gets done only once -- we don't ever want to return | |
514 | * -EIO here, instead we'll wait | |
515 | */ | |
516 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
517 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
518 | /* Maybe we can return now */ | |
519 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
520 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
521 | pr_debug("raid1: behind end write sectors" |
522 | " %llu-%llu\n", | |
4f024f37 KO |
523 | (unsigned long long) mbio->bi_iter.bi_sector, |
524 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 525 | call_bio_endio(r1_bio); |
4b6d287f N |
526 | } |
527 | } | |
528 | } | |
4367af55 | 529 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 530 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 531 | |
1da177e4 | 532 | /* |
1da177e4 LT |
533 | * Let's see if all mirrored write operations have finished |
534 | * already. | |
535 | */ | |
af6d7b76 | 536 | r1_bio_write_done(r1_bio); |
c70810b3 | 537 | |
04b857f7 N |
538 | if (to_put) |
539 | bio_put(to_put); | |
1da177e4 LT |
540 | } |
541 | ||
fd76863e | 542 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
543 | sector_t sectors) | |
544 | { | |
545 | sector_t len; | |
546 | ||
547 | WARN_ON(sectors == 0); | |
548 | /* | |
549 | * len is the number of sectors from start_sector to end of the | |
550 | * barrier unit which start_sector belongs to. | |
551 | */ | |
552 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
553 | start_sector; | |
554 | ||
555 | if (len > sectors) | |
556 | len = sectors; | |
557 | ||
558 | return len; | |
559 | } | |
560 | ||
1da177e4 LT |
561 | /* |
562 | * This routine returns the disk from which the requested read should | |
563 | * be done. There is a per-array 'next expected sequential IO' sector | |
564 | * number - if this matches on the next IO then we use the last disk. | |
565 | * There is also a per-disk 'last know head position' sector that is | |
566 | * maintained from IRQ contexts, both the normal and the resync IO | |
567 | * completion handlers update this position correctly. If there is no | |
568 | * perfect sequential match then we pick the disk whose head is closest. | |
569 | * | |
570 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
571 | * because position is mirror, not device based. | |
572 | * | |
573 | * The rdev for the device selected will have nr_pending incremented. | |
574 | */ | |
e8096360 | 575 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 576 | { |
af3a2cd6 | 577 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
578 | int sectors; |
579 | int best_good_sectors; | |
9dedf603 SL |
580 | int best_disk, best_dist_disk, best_pending_disk; |
581 | int has_nonrot_disk; | |
be4d3280 | 582 | int disk; |
76073054 | 583 | sector_t best_dist; |
9dedf603 | 584 | unsigned int min_pending; |
3cb03002 | 585 | struct md_rdev *rdev; |
f3ac8bf7 | 586 | int choose_first; |
12cee5a8 | 587 | int choose_next_idle; |
1da177e4 LT |
588 | |
589 | rcu_read_lock(); | |
590 | /* | |
8ddf9efe | 591 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
592 | * device if no resync is going on, or below the resync window. |
593 | * We take the first readable disk when above the resync window. | |
594 | */ | |
595 | retry: | |
d2eb35ac | 596 | sectors = r1_bio->sectors; |
76073054 | 597 | best_disk = -1; |
9dedf603 | 598 | best_dist_disk = -1; |
76073054 | 599 | best_dist = MaxSector; |
9dedf603 SL |
600 | best_pending_disk = -1; |
601 | min_pending = UINT_MAX; | |
d2eb35ac | 602 | best_good_sectors = 0; |
9dedf603 | 603 | has_nonrot_disk = 0; |
12cee5a8 | 604 | choose_next_idle = 0; |
2e52d449 | 605 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 606 | |
7d49ffcf GR |
607 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
608 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 609 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
610 | this_sector + sectors))) |
611 | choose_first = 1; | |
612 | else | |
613 | choose_first = 0; | |
1da177e4 | 614 | |
be4d3280 | 615 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 616 | sector_t dist; |
d2eb35ac N |
617 | sector_t first_bad; |
618 | int bad_sectors; | |
9dedf603 | 619 | unsigned int pending; |
12cee5a8 | 620 | bool nonrot; |
d2eb35ac | 621 | |
f3ac8bf7 N |
622 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
623 | if (r1_bio->bios[disk] == IO_BLOCKED | |
624 | || rdev == NULL | |
76073054 | 625 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 626 | continue; |
76073054 N |
627 | if (!test_bit(In_sync, &rdev->flags) && |
628 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 629 | continue; |
76073054 N |
630 | if (test_bit(WriteMostly, &rdev->flags)) { |
631 | /* Don't balance among write-mostly, just | |
632 | * use the first as a last resort */ | |
d1901ef0 | 633 | if (best_dist_disk < 0) { |
307729c8 N |
634 | if (is_badblock(rdev, this_sector, sectors, |
635 | &first_bad, &bad_sectors)) { | |
816b0acf | 636 | if (first_bad <= this_sector) |
307729c8 N |
637 | /* Cannot use this */ |
638 | continue; | |
639 | best_good_sectors = first_bad - this_sector; | |
640 | } else | |
641 | best_good_sectors = sectors; | |
d1901ef0 TH |
642 | best_dist_disk = disk; |
643 | best_pending_disk = disk; | |
307729c8 | 644 | } |
76073054 N |
645 | continue; |
646 | } | |
647 | /* This is a reasonable device to use. It might | |
648 | * even be best. | |
649 | */ | |
d2eb35ac N |
650 | if (is_badblock(rdev, this_sector, sectors, |
651 | &first_bad, &bad_sectors)) { | |
652 | if (best_dist < MaxSector) | |
653 | /* already have a better device */ | |
654 | continue; | |
655 | if (first_bad <= this_sector) { | |
656 | /* cannot read here. If this is the 'primary' | |
657 | * device, then we must not read beyond | |
658 | * bad_sectors from another device.. | |
659 | */ | |
660 | bad_sectors -= (this_sector - first_bad); | |
661 | if (choose_first && sectors > bad_sectors) | |
662 | sectors = bad_sectors; | |
663 | if (best_good_sectors > sectors) | |
664 | best_good_sectors = sectors; | |
665 | ||
666 | } else { | |
667 | sector_t good_sectors = first_bad - this_sector; | |
668 | if (good_sectors > best_good_sectors) { | |
669 | best_good_sectors = good_sectors; | |
670 | best_disk = disk; | |
671 | } | |
672 | if (choose_first) | |
673 | break; | |
674 | } | |
675 | continue; | |
d82dd0e3 TM |
676 | } else { |
677 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
678 | best_disk = -1; | |
d2eb35ac | 679 | best_good_sectors = sectors; |
d82dd0e3 | 680 | } |
d2eb35ac | 681 | |
2e52d449 N |
682 | if (best_disk >= 0) |
683 | /* At least two disks to choose from so failfast is OK */ | |
684 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
685 | ||
12cee5a8 SL |
686 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
687 | has_nonrot_disk |= nonrot; | |
9dedf603 | 688 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 689 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 690 | if (choose_first) { |
76073054 | 691 | best_disk = disk; |
1da177e4 LT |
692 | break; |
693 | } | |
12cee5a8 SL |
694 | /* Don't change to another disk for sequential reads */ |
695 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
696 | || dist == 0) { | |
697 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
698 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
699 | ||
700 | best_disk = disk; | |
701 | /* | |
702 | * If buffered sequential IO size exceeds optimal | |
703 | * iosize, check if there is idle disk. If yes, choose | |
704 | * the idle disk. read_balance could already choose an | |
705 | * idle disk before noticing it's a sequential IO in | |
706 | * this disk. This doesn't matter because this disk | |
707 | * will idle, next time it will be utilized after the | |
708 | * first disk has IO size exceeds optimal iosize. In | |
709 | * this way, iosize of the first disk will be optimal | |
710 | * iosize at least. iosize of the second disk might be | |
711 | * small, but not a big deal since when the second disk | |
712 | * starts IO, the first disk is likely still busy. | |
713 | */ | |
714 | if (nonrot && opt_iosize > 0 && | |
715 | mirror->seq_start != MaxSector && | |
716 | mirror->next_seq_sect > opt_iosize && | |
717 | mirror->next_seq_sect - opt_iosize >= | |
718 | mirror->seq_start) { | |
719 | choose_next_idle = 1; | |
720 | continue; | |
721 | } | |
722 | break; | |
723 | } | |
12cee5a8 SL |
724 | |
725 | if (choose_next_idle) | |
726 | continue; | |
9dedf603 SL |
727 | |
728 | if (min_pending > pending) { | |
729 | min_pending = pending; | |
730 | best_pending_disk = disk; | |
731 | } | |
732 | ||
76073054 N |
733 | if (dist < best_dist) { |
734 | best_dist = dist; | |
9dedf603 | 735 | best_dist_disk = disk; |
1da177e4 | 736 | } |
f3ac8bf7 | 737 | } |
1da177e4 | 738 | |
9dedf603 SL |
739 | /* |
740 | * If all disks are rotational, choose the closest disk. If any disk is | |
741 | * non-rotational, choose the disk with less pending request even the | |
742 | * disk is rotational, which might/might not be optimal for raids with | |
743 | * mixed ratation/non-rotational disks depending on workload. | |
744 | */ | |
745 | if (best_disk == -1) { | |
2e52d449 | 746 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
747 | best_disk = best_pending_disk; |
748 | else | |
749 | best_disk = best_dist_disk; | |
750 | } | |
751 | ||
76073054 N |
752 | if (best_disk >= 0) { |
753 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
754 | if (!rdev) |
755 | goto retry; | |
756 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 757 | sectors = best_good_sectors; |
12cee5a8 SL |
758 | |
759 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
760 | conf->mirrors[best_disk].seq_start = this_sector; | |
761 | ||
be4d3280 | 762 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
763 | } |
764 | rcu_read_unlock(); | |
d2eb35ac | 765 | *max_sectors = sectors; |
1da177e4 | 766 | |
76073054 | 767 | return best_disk; |
1da177e4 LT |
768 | } |
769 | ||
5c675f83 | 770 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 771 | { |
e8096360 | 772 | struct r1conf *conf = mddev->private; |
0d129228 N |
773 | int i, ret = 0; |
774 | ||
4452226e | 775 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
776 | conf->pending_count >= max_queued_requests) |
777 | return 1; | |
778 | ||
0d129228 | 779 | rcu_read_lock(); |
f53e29fc | 780 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 781 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 782 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 783 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 784 | |
1ed7242e JB |
785 | BUG_ON(!q); |
786 | ||
0d129228 N |
787 | /* Note the '|| 1' - when read_balance prefers |
788 | * non-congested targets, it can be removed | |
789 | */ | |
4452226e | 790 | if ((bits & (1 << WB_async_congested)) || 1) |
dc3b17cc | 791 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 | 792 | else |
dc3b17cc | 793 | ret &= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
794 | } |
795 | } | |
796 | rcu_read_unlock(); | |
797 | return ret; | |
798 | } | |
0d129228 | 799 | |
673ca68d N |
800 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
801 | { | |
802 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
e64e4018 | 803 | md_bitmap_unplug(conf->mddev->bitmap); |
673ca68d N |
804 | wake_up(&conf->wait_barrier); |
805 | ||
806 | while (bio) { /* submit pending writes */ | |
807 | struct bio *next = bio->bi_next; | |
74d46992 | 808 | struct md_rdev *rdev = (void *)bio->bi_disk; |
673ca68d | 809 | bio->bi_next = NULL; |
74d46992 | 810 | bio_set_dev(bio, rdev->bdev); |
673ca68d | 811 | if (test_bit(Faulty, &rdev->flags)) { |
6308d8e3 | 812 | bio_io_error(bio); |
673ca68d | 813 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
74d46992 | 814 | !blk_queue_discard(bio->bi_disk->queue))) |
673ca68d N |
815 | /* Just ignore it */ |
816 | bio_endio(bio); | |
817 | else | |
818 | generic_make_request(bio); | |
819 | bio = next; | |
820 | } | |
821 | } | |
822 | ||
e8096360 | 823 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
824 | { |
825 | /* Any writes that have been queued but are awaiting | |
826 | * bitmap updates get flushed here. | |
a35e63ef | 827 | */ |
a35e63ef N |
828 | spin_lock_irq(&conf->device_lock); |
829 | ||
830 | if (conf->pending_bio_list.head) { | |
18022a1b | 831 | struct blk_plug plug; |
a35e63ef | 832 | struct bio *bio; |
18022a1b | 833 | |
a35e63ef | 834 | bio = bio_list_get(&conf->pending_bio_list); |
34db0cd6 | 835 | conf->pending_count = 0; |
a35e63ef | 836 | spin_unlock_irq(&conf->device_lock); |
474beb57 N |
837 | |
838 | /* | |
839 | * As this is called in a wait_event() loop (see freeze_array), | |
840 | * current->state might be TASK_UNINTERRUPTIBLE which will | |
841 | * cause a warning when we prepare to wait again. As it is | |
842 | * rare that this path is taken, it is perfectly safe to force | |
843 | * us to go around the wait_event() loop again, so the warning | |
844 | * is a false-positive. Silence the warning by resetting | |
845 | * thread state | |
846 | */ | |
847 | __set_current_state(TASK_RUNNING); | |
18022a1b | 848 | blk_start_plug(&plug); |
673ca68d | 849 | flush_bio_list(conf, bio); |
18022a1b | 850 | blk_finish_plug(&plug); |
a35e63ef N |
851 | } else |
852 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
853 | } |
854 | ||
17999be4 N |
855 | /* Barriers.... |
856 | * Sometimes we need to suspend IO while we do something else, | |
857 | * either some resync/recovery, or reconfigure the array. | |
858 | * To do this we raise a 'barrier'. | |
859 | * The 'barrier' is a counter that can be raised multiple times | |
860 | * to count how many activities are happening which preclude | |
861 | * normal IO. | |
862 | * We can only raise the barrier if there is no pending IO. | |
863 | * i.e. if nr_pending == 0. | |
864 | * We choose only to raise the barrier if no-one is waiting for the | |
865 | * barrier to go down. This means that as soon as an IO request | |
866 | * is ready, no other operations which require a barrier will start | |
867 | * until the IO request has had a chance. | |
868 | * | |
869 | * So: regular IO calls 'wait_barrier'. When that returns there | |
870 | * is no backgroup IO happening, It must arrange to call | |
871 | * allow_barrier when it has finished its IO. | |
872 | * backgroup IO calls must call raise_barrier. Once that returns | |
873 | * there is no normal IO happeing. It must arrange to call | |
874 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 875 | */ |
8c242593 | 876 | static sector_t raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 877 | { |
fd76863e | 878 | int idx = sector_to_idx(sector_nr); |
879 | ||
1da177e4 | 880 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
881 | |
882 | /* Wait until no block IO is waiting */ | |
824e47da | 883 | wait_event_lock_irq(conf->wait_barrier, |
884 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 885 | conf->resync_lock); |
17999be4 N |
886 | |
887 | /* block any new IO from starting */ | |
824e47da | 888 | atomic_inc(&conf->barrier[idx]); |
889 | /* | |
890 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
891 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
892 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
893 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
894 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
895 | * there will be a race between raise_barrier() and _wait_barrier(). | |
896 | */ | |
897 | smp_mb__after_atomic(); | |
17999be4 | 898 | |
79ef3a8a | 899 | /* For these conditions we must wait: |
900 | * A: while the array is in frozen state | |
fd76863e | 901 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
902 | * existing in corresponding I/O barrier bucket. | |
903 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
904 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 905 | */ |
17999be4 | 906 | wait_event_lock_irq(conf->wait_barrier, |
8c242593 | 907 | (!conf->array_frozen && |
824e47da | 908 | !atomic_read(&conf->nr_pending[idx]) && |
8c242593 YY |
909 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || |
910 | test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), | |
eed8c02e | 911 | conf->resync_lock); |
17999be4 | 912 | |
8c242593 YY |
913 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
914 | atomic_dec(&conf->barrier[idx]); | |
915 | spin_unlock_irq(&conf->resync_lock); | |
916 | wake_up(&conf->wait_barrier); | |
917 | return -EINTR; | |
918 | } | |
919 | ||
43ac9b84 | 920 | atomic_inc(&conf->nr_sync_pending); |
17999be4 | 921 | spin_unlock_irq(&conf->resync_lock); |
8c242593 YY |
922 | |
923 | return 0; | |
17999be4 N |
924 | } |
925 | ||
fd76863e | 926 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 927 | { |
fd76863e | 928 | int idx = sector_to_idx(sector_nr); |
929 | ||
824e47da | 930 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 931 | |
824e47da | 932 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 933 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
934 | wake_up(&conf->wait_barrier); |
935 | } | |
936 | ||
fd76863e | 937 | static void _wait_barrier(struct r1conf *conf, int idx) |
17999be4 | 938 | { |
824e47da | 939 | /* |
940 | * We need to increase conf->nr_pending[idx] very early here, | |
941 | * then raise_barrier() can be blocked when it waits for | |
942 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
943 | * conf->resync_lock when there is no barrier raised in same | |
944 | * barrier unit bucket. Also if the array is frozen, I/O | |
945 | * should be blocked until array is unfrozen. | |
946 | */ | |
947 | atomic_inc(&conf->nr_pending[idx]); | |
948 | /* | |
949 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
950 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
951 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
952 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
953 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
954 | * will be a race between _wait_barrier() and raise_barrier(). | |
955 | */ | |
956 | smp_mb__after_atomic(); | |
79ef3a8a | 957 | |
824e47da | 958 | /* |
959 | * Don't worry about checking two atomic_t variables at same time | |
960 | * here. If during we check conf->barrier[idx], the array is | |
961 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
962 | * 0, it is safe to return and make the I/O continue. Because the | |
963 | * array is frozen, all I/O returned here will eventually complete | |
964 | * or be queued, no race will happen. See code comment in | |
965 | * frozen_array(). | |
966 | */ | |
967 | if (!READ_ONCE(conf->array_frozen) && | |
968 | !atomic_read(&conf->barrier[idx])) | |
969 | return; | |
79ef3a8a | 970 | |
824e47da | 971 | /* |
972 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
973 | * should be decreased before waiting for barrier to drop. | |
974 | * Otherwise, we may encounter a race condition because | |
975 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
976 | * to be 0 at same time. | |
977 | */ | |
978 | spin_lock_irq(&conf->resync_lock); | |
979 | atomic_inc(&conf->nr_waiting[idx]); | |
980 | atomic_dec(&conf->nr_pending[idx]); | |
981 | /* | |
982 | * In case freeze_array() is waiting for | |
983 | * get_unqueued_pending() == extra | |
984 | */ | |
985 | wake_up(&conf->wait_barrier); | |
986 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
987 | wait_event_lock_irq(conf->wait_barrier, | |
988 | !conf->array_frozen && | |
989 | !atomic_read(&conf->barrier[idx]), | |
990 | conf->resync_lock); | |
991 | atomic_inc(&conf->nr_pending[idx]); | |
992 | atomic_dec(&conf->nr_waiting[idx]); | |
fd76863e | 993 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 994 | } |
995 | ||
fd76863e | 996 | static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
79ef3a8a | 997 | { |
fd76863e | 998 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 999 | |
824e47da | 1000 | /* |
1001 | * Very similar to _wait_barrier(). The difference is, for read | |
1002 | * I/O we don't need wait for sync I/O, but if the whole array | |
1003 | * is frozen, the read I/O still has to wait until the array is | |
1004 | * unfrozen. Since there is no ordering requirement with | |
1005 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
1006 | */ | |
1007 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 1008 | |
824e47da | 1009 | if (!READ_ONCE(conf->array_frozen)) |
1010 | return; | |
1011 | ||
1012 | spin_lock_irq(&conf->resync_lock); | |
1013 | atomic_inc(&conf->nr_waiting[idx]); | |
1014 | atomic_dec(&conf->nr_pending[idx]); | |
1015 | /* | |
1016 | * In case freeze_array() is waiting for | |
1017 | * get_unqueued_pending() == extra | |
1018 | */ | |
1019 | wake_up(&conf->wait_barrier); | |
1020 | /* Wait for array to be unfrozen */ | |
1021 | wait_event_lock_irq(conf->wait_barrier, | |
1022 | !conf->array_frozen, | |
1023 | conf->resync_lock); | |
1024 | atomic_inc(&conf->nr_pending[idx]); | |
1025 | atomic_dec(&conf->nr_waiting[idx]); | |
1da177e4 LT |
1026 | spin_unlock_irq(&conf->resync_lock); |
1027 | } | |
1028 | ||
fd76863e | 1029 | static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 1030 | { |
fd76863e | 1031 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 1032 | |
fd76863e | 1033 | _wait_barrier(conf, idx); |
1034 | } | |
1035 | ||
fd76863e | 1036 | static void _allow_barrier(struct r1conf *conf, int idx) |
17999be4 | 1037 | { |
824e47da | 1038 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
1039 | wake_up(&conf->wait_barrier); |
1040 | } | |
1041 | ||
fd76863e | 1042 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
1043 | { | |
1044 | int idx = sector_to_idx(sector_nr); | |
1045 | ||
1046 | _allow_barrier(conf, idx); | |
1047 | } | |
1048 | ||
fd76863e | 1049 | /* conf->resync_lock should be held */ |
1050 | static int get_unqueued_pending(struct r1conf *conf) | |
1051 | { | |
1052 | int idx, ret; | |
1053 | ||
43ac9b84 XN |
1054 | ret = atomic_read(&conf->nr_sync_pending); |
1055 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1056 | ret += atomic_read(&conf->nr_pending[idx]) - |
1057 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1058 | |
1059 | return ret; | |
1060 | } | |
1061 | ||
e2d59925 | 1062 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1063 | { |
fd76863e | 1064 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1065 | * go quiet. |
fd76863e | 1066 | * This is called in two situations: |
1067 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1068 | * 2) one normal I/O request failed. | |
1069 | ||
1070 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1071 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1072 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1073 | * queued. When everything goes quite, there are only queued I/Os left. | |
1074 | ||
1075 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1076 | * barrier bucket index which this I/O request hits. When all sync and | |
1077 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1078 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1079 | * in handle_read_error(), we may call freeze_array() before trying to | |
1080 | * fix the read error. In this case, the error read I/O is not queued, | |
1081 | * so get_unqueued_pending() == 1. | |
1082 | * | |
1083 | * Therefore before this function returns, we need to wait until | |
1084 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1085 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1086 | */ |
1087 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1088 | conf->array_frozen = 1; |
578b54ad | 1089 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1090 | wait_event_lock_irq_cmd( |
1091 | conf->wait_barrier, | |
1092 | get_unqueued_pending(conf) == extra, | |
1093 | conf->resync_lock, | |
1094 | flush_pending_writes(conf)); | |
ddaf22ab N |
1095 | spin_unlock_irq(&conf->resync_lock); |
1096 | } | |
e8096360 | 1097 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1098 | { |
1099 | /* reverse the effect of the freeze */ | |
1100 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1101 | conf->array_frozen = 0; |
ddaf22ab | 1102 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1103 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1104 | } |
1105 | ||
16d56e2f | 1106 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1107 | struct bio *bio) |
4b6d287f | 1108 | { |
cb83efcf | 1109 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1110 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1111 | int i = 0; | |
1112 | struct bio *behind_bio = NULL; | |
1113 | ||
1114 | behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); | |
1115 | if (!behind_bio) | |
16d56e2f | 1116 | return; |
4b6d287f | 1117 | |
41743c1f | 1118 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1119 | if (!bio_has_data(bio)) { |
1120 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1121 | goto skip_copy; |
16d56e2f | 1122 | } |
41743c1f | 1123 | |
dba40d46 MD |
1124 | behind_bio->bi_write_hint = bio->bi_write_hint; |
1125 | ||
841c1316 ML |
1126 | while (i < vcnt && size) { |
1127 | struct page *page; | |
1128 | int len = min_t(int, PAGE_SIZE, size); | |
1129 | ||
1130 | page = alloc_page(GFP_NOIO); | |
1131 | if (unlikely(!page)) | |
1132 | goto free_pages; | |
1133 | ||
1134 | bio_add_page(behind_bio, page, len, 0); | |
1135 | ||
1136 | size -= len; | |
1137 | i++; | |
4b6d287f | 1138 | } |
841c1316 | 1139 | |
cb83efcf | 1140 | bio_copy_data(behind_bio, bio); |
41743c1f | 1141 | skip_copy: |
56a64c17 | 1142 | r1_bio->behind_master_bio = behind_bio; |
af6d7b76 | 1143 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1144 | |
16d56e2f | 1145 | return; |
841c1316 ML |
1146 | |
1147 | free_pages: | |
4f024f37 KO |
1148 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1149 | bio->bi_iter.bi_size); | |
841c1316 | 1150 | bio_free_pages(behind_bio); |
16d56e2f | 1151 | bio_put(behind_bio); |
4b6d287f N |
1152 | } |
1153 | ||
f54a9d0e N |
1154 | struct raid1_plug_cb { |
1155 | struct blk_plug_cb cb; | |
1156 | struct bio_list pending; | |
1157 | int pending_cnt; | |
1158 | }; | |
1159 | ||
1160 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1161 | { | |
1162 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1163 | cb); | |
1164 | struct mddev *mddev = plug->cb.data; | |
1165 | struct r1conf *conf = mddev->private; | |
1166 | struct bio *bio; | |
1167 | ||
874807a8 | 1168 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1169 | spin_lock_irq(&conf->device_lock); |
1170 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1171 | conf->pending_count += plug->pending_cnt; | |
1172 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1173 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1174 | md_wakeup_thread(mddev->thread); |
1175 | kfree(plug); | |
1176 | return; | |
1177 | } | |
1178 | ||
1179 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1180 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1181 | flush_bio_list(conf, bio); |
f54a9d0e N |
1182 | kfree(plug); |
1183 | } | |
1184 | ||
689389a0 N |
1185 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1186 | { | |
1187 | r1_bio->master_bio = bio; | |
1188 | r1_bio->sectors = bio_sectors(bio); | |
1189 | r1_bio->state = 0; | |
1190 | r1_bio->mddev = mddev; | |
1191 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1192 | } | |
1193 | ||
fd76863e | 1194 | static inline struct r1bio * |
689389a0 | 1195 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1196 | { |
1197 | struct r1conf *conf = mddev->private; | |
1198 | struct r1bio *r1_bio; | |
1199 | ||
afeee514 | 1200 | r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); |
689389a0 N |
1201 | /* Ensure no bio records IO_BLOCKED */ |
1202 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1203 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1204 | return r1_bio; |
1205 | } | |
1206 | ||
c230e7e5 | 1207 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1208 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1209 | { |
e8096360 | 1210 | struct r1conf *conf = mddev->private; |
0eaf822c | 1211 | struct raid1_info *mirror; |
1da177e4 | 1212 | struct bio *read_bio; |
3b046a97 RL |
1213 | struct bitmap *bitmap = mddev->bitmap; |
1214 | const int op = bio_op(bio); | |
1215 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
3b046a97 RL |
1216 | int max_sectors; |
1217 | int rdisk; | |
689389a0 N |
1218 | bool print_msg = !!r1_bio; |
1219 | char b[BDEVNAME_SIZE]; | |
3b046a97 | 1220 | |
fd76863e | 1221 | /* |
689389a0 N |
1222 | * If r1_bio is set, we are blocking the raid1d thread |
1223 | * so there is a tiny risk of deadlock. So ask for | |
1224 | * emergency memory if needed. | |
fd76863e | 1225 | */ |
689389a0 | 1226 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1227 | |
689389a0 N |
1228 | if (print_msg) { |
1229 | /* Need to get the block device name carefully */ | |
1230 | struct md_rdev *rdev; | |
1231 | rcu_read_lock(); | |
1232 | rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); | |
1233 | if (rdev) | |
1234 | bdevname(rdev->bdev, b); | |
1235 | else | |
1236 | strcpy(b, "???"); | |
1237 | rcu_read_unlock(); | |
1238 | } | |
3b046a97 | 1239 | |
fd76863e | 1240 | /* |
fd76863e | 1241 | * Still need barrier for READ in case that whole |
1242 | * array is frozen. | |
fd76863e | 1243 | */ |
fd76863e | 1244 | wait_read_barrier(conf, bio->bi_iter.bi_sector); |
1245 | ||
689389a0 N |
1246 | if (!r1_bio) |
1247 | r1_bio = alloc_r1bio(mddev, bio); | |
1248 | else | |
1249 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1250 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1251 | |
1252 | /* | |
1253 | * make_request() can abort the operation when read-ahead is being | |
1254 | * used and no empty request is available. | |
1255 | */ | |
3b046a97 RL |
1256 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1257 | ||
1258 | if (rdisk < 0) { | |
1259 | /* couldn't find anywhere to read from */ | |
689389a0 N |
1260 | if (print_msg) { |
1261 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", | |
1262 | mdname(mddev), | |
1263 | b, | |
1264 | (unsigned long long)r1_bio->sector); | |
1265 | } | |
3b046a97 RL |
1266 | raid_end_bio_io(r1_bio); |
1267 | return; | |
1268 | } | |
1269 | mirror = conf->mirrors + rdisk; | |
1270 | ||
689389a0 N |
1271 | if (print_msg) |
1272 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", | |
1273 | mdname(mddev), | |
1274 | (unsigned long long)r1_bio->sector, | |
1275 | bdevname(mirror->rdev->bdev, b)); | |
1276 | ||
3b046a97 RL |
1277 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1278 | bitmap) { | |
1279 | /* | |
1280 | * Reading from a write-mostly device must take care not to | |
1281 | * over-take any writes that are 'behind' | |
1282 | */ | |
1283 | raid1_log(mddev, "wait behind writes"); | |
1284 | wait_event(bitmap->behind_wait, | |
1285 | atomic_read(&bitmap->behind_writes) == 0); | |
1286 | } | |
c230e7e5 N |
1287 | |
1288 | if (max_sectors < bio_sectors(bio)) { | |
1289 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1290 | gfp, &conf->bio_split); |
c230e7e5 N |
1291 | bio_chain(split, bio); |
1292 | generic_make_request(bio); | |
1293 | bio = split; | |
1294 | r1_bio->master_bio = bio; | |
1295 | r1_bio->sectors = max_sectors; | |
1296 | } | |
1297 | ||
3b046a97 | 1298 | r1_bio->read_disk = rdisk; |
3b046a97 | 1299 | |
afeee514 | 1300 | read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); |
3b046a97 RL |
1301 | |
1302 | r1_bio->bios[rdisk] = read_bio; | |
1303 | ||
1304 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1305 | mirror->rdev->data_offset; | |
74d46992 | 1306 | bio_set_dev(read_bio, mirror->rdev->bdev); |
3b046a97 RL |
1307 | read_bio->bi_end_io = raid1_end_read_request; |
1308 | bio_set_op_attrs(read_bio, op, do_sync); | |
1309 | if (test_bit(FailFast, &mirror->rdev->flags) && | |
1310 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1311 | read_bio->bi_opf |= MD_FAILFAST; | |
1312 | read_bio->bi_private = r1_bio; | |
1313 | ||
1314 | if (mddev->gendisk) | |
74d46992 CH |
1315 | trace_block_bio_remap(read_bio->bi_disk->queue, read_bio, |
1316 | disk_devt(mddev->gendisk), r1_bio->sector); | |
3b046a97 | 1317 | |
c230e7e5 | 1318 | generic_make_request(read_bio); |
3b046a97 RL |
1319 | } |
1320 | ||
c230e7e5 N |
1321 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1322 | int max_write_sectors) | |
3b046a97 RL |
1323 | { |
1324 | struct r1conf *conf = mddev->private; | |
fd76863e | 1325 | struct r1bio *r1_bio; |
1f68f0c4 | 1326 | int i, disks; |
3b046a97 | 1327 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1328 | unsigned long flags; |
3cb03002 | 1329 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1330 | struct blk_plug_cb *cb; |
1331 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 | 1332 | int first_clone; |
1f68f0c4 | 1333 | int max_sectors; |
191ea9b2 | 1334 | |
b3143b9a | 1335 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1336 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1337 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 | 1338 | |
6eef4b21 N |
1339 | DEFINE_WAIT(w); |
1340 | for (;;) { | |
6eef4b21 | 1341 | prepare_to_wait(&conf->wait_barrier, |
ae89fd3d | 1342 | &w, TASK_IDLE); |
f81f7302 | 1343 | if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
385f4d7f | 1344 | bio->bi_iter.bi_sector, |
b3143b9a | 1345 | bio_end_sector(bio))) |
6eef4b21 N |
1346 | break; |
1347 | schedule(); | |
1348 | } | |
1349 | finish_wait(&conf->wait_barrier, &w); | |
1350 | } | |
f81f7302 GJ |
1351 | |
1352 | /* | |
1353 | * Register the new request and wait if the reconstruction | |
1354 | * thread has put up a bar for new requests. | |
1355 | * Continue immediately if no resync is active currently. | |
1356 | */ | |
fd76863e | 1357 | wait_barrier(conf, bio->bi_iter.bi_sector); |
1358 | ||
689389a0 | 1359 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1360 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1361 | |
34db0cd6 N |
1362 | if (conf->pending_count >= max_queued_requests) { |
1363 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1364 | raid1_log(mddev, "wait queued"); |
34db0cd6 N |
1365 | wait_event(conf->wait_barrier, |
1366 | conf->pending_count < max_queued_requests); | |
1367 | } | |
1f68f0c4 | 1368 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1369 | * inc refcount on their rdev. Record them by setting |
1370 | * bios[x] to bio | |
1f68f0c4 N |
1371 | * If there are known/acknowledged bad blocks on any device on |
1372 | * which we have seen a write error, we want to avoid writing those | |
1373 | * blocks. | |
1374 | * This potentially requires several writes to write around | |
1375 | * the bad blocks. Each set of writes gets it's own r1bio | |
1376 | * with a set of bios attached. | |
1da177e4 | 1377 | */ |
c3b328ac | 1378 | |
8f19ccb2 | 1379 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1380 | retry_write: |
1381 | blocked_rdev = NULL; | |
1da177e4 | 1382 | rcu_read_lock(); |
1f68f0c4 | 1383 | max_sectors = r1_bio->sectors; |
1da177e4 | 1384 | for (i = 0; i < disks; i++) { |
3cb03002 | 1385 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1386 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1387 | atomic_inc(&rdev->nr_pending); | |
1388 | blocked_rdev = rdev; | |
1389 | break; | |
1390 | } | |
1f68f0c4 | 1391 | r1_bio->bios[i] = NULL; |
8ae12666 | 1392 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1393 | if (i < conf->raid_disks) |
1394 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1395 | continue; |
1396 | } | |
1397 | ||
1398 | atomic_inc(&rdev->nr_pending); | |
1399 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1400 | sector_t first_bad; | |
1401 | int bad_sectors; | |
1402 | int is_bad; | |
1403 | ||
3b046a97 | 1404 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1405 | &first_bad, &bad_sectors); |
1406 | if (is_bad < 0) { | |
1407 | /* mustn't write here until the bad block is | |
1408 | * acknowledged*/ | |
1409 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1410 | blocked_rdev = rdev; | |
1411 | break; | |
1412 | } | |
1413 | if (is_bad && first_bad <= r1_bio->sector) { | |
1414 | /* Cannot write here at all */ | |
1415 | bad_sectors -= (r1_bio->sector - first_bad); | |
1416 | if (bad_sectors < max_sectors) | |
1417 | /* mustn't write more than bad_sectors | |
1418 | * to other devices yet | |
1419 | */ | |
1420 | max_sectors = bad_sectors; | |
03c902e1 | 1421 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1422 | /* We don't set R1BIO_Degraded as that |
1423 | * only applies if the disk is | |
1424 | * missing, so it might be re-added, | |
1425 | * and we want to know to recover this | |
1426 | * chunk. | |
1427 | * In this case the device is here, | |
1428 | * and the fact that this chunk is not | |
1429 | * in-sync is recorded in the bad | |
1430 | * block log | |
1431 | */ | |
1432 | continue; | |
964147d5 | 1433 | } |
1f68f0c4 N |
1434 | if (is_bad) { |
1435 | int good_sectors = first_bad - r1_bio->sector; | |
1436 | if (good_sectors < max_sectors) | |
1437 | max_sectors = good_sectors; | |
1438 | } | |
1439 | } | |
1440 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1441 | } |
1442 | rcu_read_unlock(); | |
1443 | ||
6bfe0b49 DW |
1444 | if (unlikely(blocked_rdev)) { |
1445 | /* Wait for this device to become unblocked */ | |
1446 | int j; | |
1447 | ||
1448 | for (j = 0; j < i; j++) | |
1449 | if (r1_bio->bios[j]) | |
1450 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1451 | r1_bio->state = 0; |
fd76863e | 1452 | allow_barrier(conf, bio->bi_iter.bi_sector); |
578b54ad | 1453 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1454 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
fd76863e | 1455 | wait_barrier(conf, bio->bi_iter.bi_sector); |
6bfe0b49 DW |
1456 | goto retry_write; |
1457 | } | |
1458 | ||
c230e7e5 N |
1459 | if (max_sectors < bio_sectors(bio)) { |
1460 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1461 | GFP_NOIO, &conf->bio_split); |
c230e7e5 N |
1462 | bio_chain(split, bio); |
1463 | generic_make_request(bio); | |
1464 | bio = split; | |
1465 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1466 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1467 | } |
4b6d287f | 1468 | |
4e78064f | 1469 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1470 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1471 | |
1f68f0c4 | 1472 | first_clone = 1; |
d8c84c4f | 1473 | |
1da177e4 | 1474 | for (i = 0; i < disks; i++) { |
8e58e327 | 1475 | struct bio *mbio = NULL; |
1da177e4 LT |
1476 | if (!r1_bio->bios[i]) |
1477 | continue; | |
1478 | ||
1f68f0c4 N |
1479 | if (first_clone) { |
1480 | /* do behind I/O ? | |
1481 | * Not if there are too many, or cannot | |
1482 | * allocate memory, or a reader on WriteMostly | |
1483 | * is waiting for behind writes to flush */ | |
1484 | if (bitmap && | |
1485 | (atomic_read(&bitmap->behind_writes) | |
1486 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1487 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1488 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1489 | } |
1f68f0c4 | 1490 | |
e64e4018 AS |
1491 | md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, |
1492 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1f68f0c4 N |
1493 | first_clone = 0; |
1494 | } | |
8e58e327 | 1495 | |
16d56e2f SL |
1496 | if (r1_bio->behind_master_bio) |
1497 | mbio = bio_clone_fast(r1_bio->behind_master_bio, | |
afeee514 | 1498 | GFP_NOIO, &mddev->bio_set); |
16d56e2f | 1499 | else |
afeee514 | 1500 | mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
8e58e327 | 1501 | |
841c1316 | 1502 | if (r1_bio->behind_master_bio) { |
3e148a32 GJ |
1503 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
1504 | ||
1505 | if (test_bit(WBCollisionCheck, &rdev->flags)) { | |
1506 | sector_t lo = r1_bio->sector; | |
1507 | sector_t hi = r1_bio->sector + r1_bio->sectors; | |
1508 | ||
1509 | wait_event(rdev->wb_io_wait, | |
1510 | check_and_add_wb(rdev, lo, hi) == 0); | |
1511 | } | |
1512 | if (test_bit(WriteMostly, &rdev->flags)) | |
4b6d287f N |
1513 | atomic_inc(&r1_bio->behind_remaining); |
1514 | } | |
1515 | ||
1f68f0c4 N |
1516 | r1_bio->bios[i] = mbio; |
1517 | ||
4f024f37 | 1518 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 | 1519 | conf->mirrors[i].rdev->data_offset); |
74d46992 | 1520 | bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); |
1f68f0c4 | 1521 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1522 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
212e7eb7 N |
1523 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
1524 | !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && | |
1525 | conf->raid_disks - mddev->degraded > 1) | |
1526 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1527 | mbio->bi_private = r1_bio; |
1528 | ||
1da177e4 | 1529 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1530 | |
109e3765 | 1531 | if (mddev->gendisk) |
74d46992 | 1532 | trace_block_bio_remap(mbio->bi_disk->queue, |
109e3765 N |
1533 | mbio, disk_devt(mddev->gendisk), |
1534 | r1_bio->sector); | |
1535 | /* flush_pending_writes() needs access to the rdev so...*/ | |
74d46992 | 1536 | mbio->bi_disk = (void *)conf->mirrors[i].rdev; |
109e3765 | 1537 | |
f54a9d0e N |
1538 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1539 | if (cb) | |
1540 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1541 | else | |
1542 | plug = NULL; | |
f54a9d0e N |
1543 | if (plug) { |
1544 | bio_list_add(&plug->pending, mbio); | |
1545 | plug->pending_cnt++; | |
1546 | } else { | |
23b245c0 | 1547 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1548 | bio_list_add(&conf->pending_bio_list, mbio); |
1549 | conf->pending_count++; | |
23b245c0 | 1550 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1551 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1552 | } |
1da177e4 | 1553 | } |
1f68f0c4 | 1554 | |
079fa166 N |
1555 | r1_bio_write_done(r1_bio); |
1556 | ||
1557 | /* In case raid1d snuck in to freeze_array */ | |
1558 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1559 | } |
1560 | ||
cc27b0c7 | 1561 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1562 | { |
fd76863e | 1563 | sector_t sectors; |
3b046a97 | 1564 | |
aff8da09 SL |
1565 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
1566 | md_flush_request(mddev, bio); | |
cc27b0c7 | 1567 | return true; |
aff8da09 | 1568 | } |
3b046a97 | 1569 | |
c230e7e5 N |
1570 | /* |
1571 | * There is a limit to the maximum size, but | |
1572 | * the read/write handler might find a lower limit | |
1573 | * due to bad blocks. To avoid multiple splits, | |
1574 | * we pass the maximum number of sectors down | |
1575 | * and let the lower level perform the split. | |
1576 | */ | |
1577 | sectors = align_to_barrier_unit_end( | |
1578 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1579 | |
c230e7e5 | 1580 | if (bio_data_dir(bio) == READ) |
689389a0 | 1581 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1582 | else { |
1583 | if (!md_write_start(mddev,bio)) | |
1584 | return false; | |
c230e7e5 | 1585 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1586 | } |
1587 | return true; | |
3b046a97 RL |
1588 | } |
1589 | ||
849674e4 | 1590 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1591 | { |
e8096360 | 1592 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1593 | int i; |
1594 | ||
1595 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1596 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1597 | rcu_read_lock(); |
1598 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1599 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1600 | seq_printf(seq, "%s", |
ddac7c7e N |
1601 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1602 | } | |
1603 | rcu_read_unlock(); | |
1da177e4 LT |
1604 | seq_printf(seq, "]"); |
1605 | } | |
1606 | ||
849674e4 | 1607 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1608 | { |
1609 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1610 | struct r1conf *conf = mddev->private; |
423f04d6 | 1611 | unsigned long flags; |
1da177e4 LT |
1612 | |
1613 | /* | |
1614 | * If it is not operational, then we have already marked it as dead | |
1615 | * else if it is the last working disks, ignore the error, let the | |
1616 | * next level up know. | |
1617 | * else mark the drive as failed | |
1618 | */ | |
2e52d449 | 1619 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1620 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1621 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1622 | /* |
1623 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1624 | * normal single drive. |
1625 | * However don't try a recovery from this drive as | |
1626 | * it is very likely to fail. | |
1da177e4 | 1627 | */ |
5389042f | 1628 | conf->recovery_disabled = mddev->recovery_disabled; |
2e52d449 | 1629 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1630 | return; |
4044ba58 | 1631 | } |
de393cde | 1632 | set_bit(Blocked, &rdev->flags); |
ebda52fa | 1633 | if (test_and_clear_bit(In_sync, &rdev->flags)) |
1da177e4 | 1634 | mddev->degraded++; |
ebda52fa | 1635 | set_bit(Faulty, &rdev->flags); |
423f04d6 | 1636 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1637 | /* |
1638 | * if recovery is running, make sure it aborts. | |
1639 | */ | |
1640 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1641 | set_mask_bits(&mddev->sb_flags, 0, |
1642 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
1d41c216 N |
1643 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1644 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1645 | mdname(mddev), bdevname(rdev->bdev, b), | |
1646 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1647 | } |
1648 | ||
e8096360 | 1649 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1650 | { |
1651 | int i; | |
1da177e4 | 1652 | |
1d41c216 | 1653 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1654 | if (!conf) { |
1d41c216 | 1655 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1656 | return; |
1657 | } | |
1d41c216 N |
1658 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1659 | conf->raid_disks); | |
1da177e4 | 1660 | |
ddac7c7e | 1661 | rcu_read_lock(); |
1da177e4 LT |
1662 | for (i = 0; i < conf->raid_disks; i++) { |
1663 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1664 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1665 | if (rdev) |
1d41c216 N |
1666 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1667 | i, !test_bit(In_sync, &rdev->flags), | |
1668 | !test_bit(Faulty, &rdev->flags), | |
1669 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1670 | } |
ddac7c7e | 1671 | rcu_read_unlock(); |
1da177e4 LT |
1672 | } |
1673 | ||
e8096360 | 1674 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1675 | { |
f6eca2d4 ND |
1676 | int idx; |
1677 | ||
1678 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { | |
1679 | _wait_barrier(conf, idx); | |
1680 | _allow_barrier(conf, idx); | |
1681 | } | |
1da177e4 | 1682 | |
afeee514 | 1683 | mempool_exit(&conf->r1buf_pool); |
1da177e4 LT |
1684 | } |
1685 | ||
fd01b88c | 1686 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1687 | { |
1688 | int i; | |
e8096360 | 1689 | struct r1conf *conf = mddev->private; |
6b965620 N |
1690 | int count = 0; |
1691 | unsigned long flags; | |
1da177e4 LT |
1692 | |
1693 | /* | |
f72ffdd6 | 1694 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1695 | * and mark them readable. |
1696 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1697 | * device_lock used to avoid races with raid1_end_read_request |
1698 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1699 | */ |
423f04d6 | 1700 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1701 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1702 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1703 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1704 | if (repl | |
1aee41f6 | 1705 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1706 | && repl->recovery_offset == MaxSector |
1707 | && !test_bit(Faulty, &repl->flags) | |
1708 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1709 | /* replacement has just become active */ | |
1710 | if (!rdev || | |
1711 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1712 | count++; | |
1713 | if (rdev) { | |
1714 | /* Replaced device not technically | |
1715 | * faulty, but we need to be sure | |
1716 | * it gets removed and never re-added | |
1717 | */ | |
1718 | set_bit(Faulty, &rdev->flags); | |
1719 | sysfs_notify_dirent_safe( | |
1720 | rdev->sysfs_state); | |
1721 | } | |
1722 | } | |
ddac7c7e | 1723 | if (rdev |
61e4947c | 1724 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1725 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1726 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1727 | count++; |
654e8b5a | 1728 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1729 | } |
1730 | } | |
6b965620 N |
1731 | mddev->degraded -= count; |
1732 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1733 | |
1734 | print_conf(conf); | |
6b965620 | 1735 | return count; |
1da177e4 LT |
1736 | } |
1737 | ||
fd01b88c | 1738 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1739 | { |
e8096360 | 1740 | struct r1conf *conf = mddev->private; |
199050ea | 1741 | int err = -EEXIST; |
41158c7e | 1742 | int mirror = 0; |
0eaf822c | 1743 | struct raid1_info *p; |
6c2fce2e | 1744 | int first = 0; |
30194636 | 1745 | int last = conf->raid_disks - 1; |
1da177e4 | 1746 | |
5389042f N |
1747 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1748 | return -EBUSY; | |
1749 | ||
1501efad DW |
1750 | if (md_integrity_add_rdev(rdev, mddev)) |
1751 | return -ENXIO; | |
1752 | ||
6c2fce2e NB |
1753 | if (rdev->raid_disk >= 0) |
1754 | first = last = rdev->raid_disk; | |
1755 | ||
70bcecdb GR |
1756 | /* |
1757 | * find the disk ... but prefer rdev->saved_raid_disk | |
1758 | * if possible. | |
1759 | */ | |
1760 | if (rdev->saved_raid_disk >= 0 && | |
1761 | rdev->saved_raid_disk >= first && | |
9e753ba9 | 1762 | rdev->saved_raid_disk < conf->raid_disks && |
70bcecdb GR |
1763 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1764 | first = last = rdev->saved_raid_disk; | |
1765 | ||
7ef449d1 | 1766 | for (mirror = first; mirror <= last; mirror++) { |
ebfeb444 | 1767 | p = conf->mirrors + mirror; |
7ef449d1 | 1768 | if (!p->rdev) { |
9092c02d JB |
1769 | if (mddev->gendisk) |
1770 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1771 | rdev->data_offset << 9); | |
1da177e4 LT |
1772 | |
1773 | p->head_position = 0; | |
1774 | rdev->raid_disk = mirror; | |
199050ea | 1775 | err = 0; |
6aea114a N |
1776 | /* As all devices are equivalent, we don't need a full recovery |
1777 | * if this was recently any drive of the array | |
1778 | */ | |
1779 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1780 | conf->fullsync = 1; |
d6065f7b | 1781 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1782 | break; |
1783 | } | |
7ef449d1 N |
1784 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1785 | p[conf->raid_disks].rdev == NULL) { | |
1786 | /* Add this device as a replacement */ | |
1787 | clear_bit(In_sync, &rdev->flags); | |
1788 | set_bit(Replacement, &rdev->flags); | |
1789 | rdev->raid_disk = mirror; | |
1790 | err = 0; | |
1791 | conf->fullsync = 1; | |
1792 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1793 | break; | |
1794 | } | |
1795 | } | |
9092c02d | 1796 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
8b904b5b | 1797 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1798 | print_conf(conf); |
199050ea | 1799 | return err; |
1da177e4 LT |
1800 | } |
1801 | ||
b8321b68 | 1802 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1803 | { |
e8096360 | 1804 | struct r1conf *conf = mddev->private; |
1da177e4 | 1805 | int err = 0; |
b8321b68 | 1806 | int number = rdev->raid_disk; |
0eaf822c | 1807 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1808 | |
b014f14c N |
1809 | if (rdev != p->rdev) |
1810 | p = conf->mirrors + conf->raid_disks + number; | |
1811 | ||
1da177e4 | 1812 | print_conf(conf); |
b8321b68 | 1813 | if (rdev == p->rdev) { |
b2d444d7 | 1814 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1815 | atomic_read(&rdev->nr_pending)) { |
1816 | err = -EBUSY; | |
1817 | goto abort; | |
1818 | } | |
046abeed | 1819 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1820 | * is not possible. |
1821 | */ | |
1822 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1823 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1824 | mddev->degraded < conf->raid_disks) { |
1825 | err = -EBUSY; | |
1826 | goto abort; | |
1827 | } | |
1da177e4 | 1828 | p->rdev = NULL; |
d787be40 N |
1829 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1830 | synchronize_rcu(); | |
1831 | if (atomic_read(&rdev->nr_pending)) { | |
1832 | /* lost the race, try later */ | |
1833 | err = -EBUSY; | |
1834 | p->rdev = rdev; | |
1835 | goto abort; | |
1836 | } | |
1837 | } | |
1838 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1839 | /* We just removed a device that is being replaced. |
1840 | * Move down the replacement. We drain all IO before | |
1841 | * doing this to avoid confusion. | |
1842 | */ | |
1843 | struct md_rdev *repl = | |
1844 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1845 | freeze_array(conf, 0); |
3de59bb9 YY |
1846 | if (atomic_read(&repl->nr_pending)) { |
1847 | /* It means that some queued IO of retry_list | |
1848 | * hold repl. Thus, we cannot set replacement | |
1849 | * as NULL, avoiding rdev NULL pointer | |
1850 | * dereference in sync_request_write and | |
1851 | * handle_write_finished. | |
1852 | */ | |
1853 | err = -EBUSY; | |
1854 | unfreeze_array(conf); | |
1855 | goto abort; | |
1856 | } | |
8c7a2c2b N |
1857 | clear_bit(Replacement, &repl->flags); |
1858 | p->rdev = repl; | |
1859 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1860 | unfreeze_array(conf); |
e5bc9c3c GJ |
1861 | } |
1862 | ||
1863 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1864 | err = md_integrity_register(mddev); |
1da177e4 LT |
1865 | } |
1866 | abort: | |
1867 | ||
1868 | print_conf(conf); | |
1869 | return err; | |
1870 | } | |
1871 | ||
4246a0b6 | 1872 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1873 | { |
98d30c58 | 1874 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1875 | |
0fc280f6 | 1876 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1877 | |
1da177e4 LT |
1878 | /* |
1879 | * we have read a block, now it needs to be re-written, | |
1880 | * or re-read if the read failed. | |
1881 | * We don't do much here, just schedule handling by raid1d | |
1882 | */ | |
4e4cbee9 | 1883 | if (!bio->bi_status) |
1da177e4 | 1884 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1885 | |
1886 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1887 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1888 | } |
1889 | ||
dfcc34c9 ND |
1890 | static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) |
1891 | { | |
1892 | sector_t sync_blocks = 0; | |
1893 | sector_t s = r1_bio->sector; | |
1894 | long sectors_to_go = r1_bio->sectors; | |
1895 | ||
1896 | /* make sure these bits don't get cleared. */ | |
1897 | do { | |
1898 | md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); | |
1899 | s += sync_blocks; | |
1900 | sectors_to_go -= sync_blocks; | |
1901 | } while (sectors_to_go > 0); | |
1902 | } | |
1903 | ||
4246a0b6 | 1904 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1905 | { |
4e4cbee9 | 1906 | int uptodate = !bio->bi_status; |
98d30c58 | 1907 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1908 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1909 | struct r1conf *conf = mddev->private; |
4367af55 N |
1910 | sector_t first_bad; |
1911 | int bad_sectors; | |
854abd75 | 1912 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1913 | |
6b1117d5 | 1914 | if (!uptodate) { |
dfcc34c9 | 1915 | abort_sync_write(mddev, r1_bio); |
854abd75 N |
1916 | set_bit(WriteErrorSeen, &rdev->flags); |
1917 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1918 | set_bit(MD_RECOVERY_NEEDED, & |
1919 | mddev->recovery); | |
d8f05d29 | 1920 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1921 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1922 | &first_bad, &bad_sectors) && |
1923 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1924 | r1_bio->sector, | |
1925 | r1_bio->sectors, | |
1926 | &first_bad, &bad_sectors) | |
1927 | ) | |
4367af55 | 1928 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1929 | |
1da177e4 | 1930 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1931 | int s = r1_bio->sectors; |
d8f05d29 N |
1932 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1933 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1934 | reschedule_retry(r1_bio); |
1935 | else { | |
1936 | put_buf(r1_bio); | |
1937 | md_done_sync(mddev, s, uptodate); | |
1938 | } | |
1da177e4 | 1939 | } |
1da177e4 LT |
1940 | } |
1941 | ||
3cb03002 | 1942 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1943 | int sectors, struct page *page, int rw) |
1944 | { | |
796a5cf0 | 1945 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1946 | /* success */ |
1947 | return 1; | |
19d67169 | 1948 | if (rw == WRITE) { |
d8f05d29 | 1949 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1950 | if (!test_and_set_bit(WantReplacement, |
1951 | &rdev->flags)) | |
1952 | set_bit(MD_RECOVERY_NEEDED, & | |
1953 | rdev->mddev->recovery); | |
1954 | } | |
d8f05d29 N |
1955 | /* need to record an error - either for the block or the device */ |
1956 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1957 | md_error(rdev->mddev, rdev); | |
1958 | return 0; | |
1959 | } | |
1960 | ||
9f2c9d12 | 1961 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1962 | { |
a68e5870 N |
1963 | /* Try some synchronous reads of other devices to get |
1964 | * good data, much like with normal read errors. Only | |
1965 | * read into the pages we already have so we don't | |
1966 | * need to re-issue the read request. | |
1967 | * We don't need to freeze the array, because being in an | |
1968 | * active sync request, there is no normal IO, and | |
1969 | * no overlapping syncs. | |
06f60385 N |
1970 | * We don't need to check is_badblock() again as we |
1971 | * made sure that anything with a bad block in range | |
1972 | * will have bi_end_io clear. | |
a68e5870 | 1973 | */ |
fd01b88c | 1974 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1975 | struct r1conf *conf = mddev->private; |
a68e5870 | 1976 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 1977 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
1978 | sector_t sect = r1_bio->sector; |
1979 | int sectors = r1_bio->sectors; | |
1980 | int idx = 0; | |
2e52d449 N |
1981 | struct md_rdev *rdev; |
1982 | ||
1983 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
1984 | if (test_bit(FailFast, &rdev->flags)) { | |
1985 | /* Don't try recovering from here - just fail it | |
1986 | * ... unless it is the last working device of course */ | |
1987 | md_error(mddev, rdev); | |
1988 | if (test_bit(Faulty, &rdev->flags)) | |
1989 | /* Don't try to read from here, but make sure | |
1990 | * put_buf does it's thing | |
1991 | */ | |
1992 | bio->bi_end_io = end_sync_write; | |
1993 | } | |
a68e5870 N |
1994 | |
1995 | while(sectors) { | |
1996 | int s = sectors; | |
1997 | int d = r1_bio->read_disk; | |
1998 | int success = 0; | |
78d7f5f7 | 1999 | int start; |
a68e5870 N |
2000 | |
2001 | if (s > (PAGE_SIZE>>9)) | |
2002 | s = PAGE_SIZE >> 9; | |
2003 | do { | |
2004 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
2005 | /* No rcu protection needed here devices | |
2006 | * can only be removed when no resync is | |
2007 | * active, and resync is currently active | |
2008 | */ | |
2009 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 2010 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 2011 | pages[idx], |
796a5cf0 | 2012 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
2013 | success = 1; |
2014 | break; | |
2015 | } | |
2016 | } | |
2017 | d++; | |
8f19ccb2 | 2018 | if (d == conf->raid_disks * 2) |
a68e5870 N |
2019 | d = 0; |
2020 | } while (!success && d != r1_bio->read_disk); | |
2021 | ||
78d7f5f7 | 2022 | if (!success) { |
a68e5870 | 2023 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
2024 | int abort = 0; |
2025 | /* Cannot read from anywhere, this block is lost. | |
2026 | * Record a bad block on each device. If that doesn't | |
2027 | * work just disable and interrupt the recovery. | |
2028 | * Don't fail devices as that won't really help. | |
2029 | */ | |
1d41c216 | 2030 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
74d46992 | 2031 | mdname(mddev), bio_devname(bio, b), |
1d41c216 | 2032 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 2033 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
2034 | rdev = conf->mirrors[d].rdev; |
2035 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
2036 | continue; | |
2037 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
2038 | abort = 1; | |
2039 | } | |
2040 | if (abort) { | |
d890fa2b N |
2041 | conf->recovery_disabled = |
2042 | mddev->recovery_disabled; | |
3a9f28a5 N |
2043 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2044 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2045 | put_buf(r1_bio); | |
2046 | return 0; | |
2047 | } | |
2048 | /* Try next page */ | |
2049 | sectors -= s; | |
2050 | sect += s; | |
2051 | idx++; | |
2052 | continue; | |
d11c171e | 2053 | } |
78d7f5f7 N |
2054 | |
2055 | start = d; | |
2056 | /* write it back and re-read */ | |
2057 | while (d != r1_bio->read_disk) { | |
2058 | if (d == 0) | |
8f19ccb2 | 2059 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2060 | d--; |
2061 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2062 | continue; | |
2063 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2064 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2065 | pages[idx], |
d8f05d29 | 2066 | WRITE) == 0) { |
78d7f5f7 N |
2067 | r1_bio->bios[d]->bi_end_io = NULL; |
2068 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2069 | } |
78d7f5f7 N |
2070 | } |
2071 | d = start; | |
2072 | while (d != r1_bio->read_disk) { | |
2073 | if (d == 0) | |
8f19ccb2 | 2074 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2075 | d--; |
2076 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2077 | continue; | |
2078 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2079 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2080 | pages[idx], |
d8f05d29 | 2081 | READ) != 0) |
9d3d8011 | 2082 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2083 | } |
a68e5870 N |
2084 | sectors -= s; |
2085 | sect += s; | |
2086 | idx ++; | |
2087 | } | |
78d7f5f7 | 2088 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2089 | bio->bi_status = 0; |
a68e5870 N |
2090 | return 1; |
2091 | } | |
2092 | ||
c95e6385 | 2093 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2094 | { |
2095 | /* We have read all readable devices. If we haven't | |
2096 | * got the block, then there is no hope left. | |
2097 | * If we have, then we want to do a comparison | |
2098 | * and skip the write if everything is the same. | |
2099 | * If any blocks failed to read, then we need to | |
2100 | * attempt an over-write | |
2101 | */ | |
fd01b88c | 2102 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2103 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2104 | int primary; |
2105 | int i; | |
f4380a91 | 2106 | int vcnt; |
a68e5870 | 2107 | |
30bc9b53 N |
2108 | /* Fix variable parts of all bios */ |
2109 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2110 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2111 | blk_status_t status; |
30bc9b53 | 2112 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2113 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2114 | if (b->bi_end_io != end_sync_read) |
2115 | continue; | |
4246a0b6 | 2116 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2117 | status = b->bi_status; |
30bc9b53 | 2118 | bio_reset(b); |
4e4cbee9 | 2119 | b->bi_status = status; |
4f024f37 | 2120 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2121 | conf->mirrors[i].rdev->data_offset; |
74d46992 | 2122 | bio_set_dev(b, conf->mirrors[i].rdev->bdev); |
30bc9b53 | 2123 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2124 | rp->raid_bio = r1_bio; |
2125 | b->bi_private = rp; | |
30bc9b53 | 2126 | |
fb0eb5df ML |
2127 | /* initialize bvec table again */ |
2128 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2129 | } |
8f19ccb2 | 2130 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2131 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2132 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2133 | r1_bio->bios[primary]->bi_end_io = NULL; |
2134 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2135 | break; | |
2136 | } | |
2137 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2138 | for (i = 0; i < conf->raid_disks * 2; i++) { |
2b070cfe | 2139 | int j = 0; |
78d7f5f7 N |
2140 | struct bio *pbio = r1_bio->bios[primary]; |
2141 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2142 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2143 | struct page **ppages = get_resync_pages(pbio)->pages; |
2144 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2145 | struct bio_vec *bi; |
8fc04e6e | 2146 | int page_len[RESYNC_PAGES] = { 0 }; |
6dc4f100 | 2147 | struct bvec_iter_all iter_all; |
a68e5870 | 2148 | |
2aabaa65 | 2149 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2150 | continue; |
4246a0b6 | 2151 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2152 | sbio->bi_status = 0; |
78d7f5f7 | 2153 | |
2b070cfe CH |
2154 | bio_for_each_segment_all(bi, sbio, iter_all) |
2155 | page_len[j++] = bi->bv_len; | |
60928a91 | 2156 | |
4e4cbee9 | 2157 | if (!status) { |
78d7f5f7 | 2158 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2159 | if (memcmp(page_address(ppages[j]), |
2160 | page_address(spages[j]), | |
60928a91 | 2161 | page_len[j])) |
78d7f5f7 | 2162 | break; |
69382e85 | 2163 | } |
78d7f5f7 N |
2164 | } else |
2165 | j = 0; | |
2166 | if (j >= 0) | |
7f7583d4 | 2167 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2168 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2169 | && !status)) { |
78d7f5f7 N |
2170 | /* No need to write to this device. */ |
2171 | sbio->bi_end_io = NULL; | |
2172 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2173 | continue; | |
2174 | } | |
d3b45c2a KO |
2175 | |
2176 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2177 | } |
a68e5870 N |
2178 | } |
2179 | ||
9f2c9d12 | 2180 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2181 | { |
e8096360 | 2182 | struct r1conf *conf = mddev->private; |
a68e5870 | 2183 | int i; |
8f19ccb2 | 2184 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2185 | struct bio *wbio; |
a68e5870 | 2186 | |
a68e5870 N |
2187 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2188 | /* ouch - failed to read all of that. */ | |
2189 | if (!fix_sync_read_error(r1_bio)) | |
2190 | return; | |
7ca78d57 N |
2191 | |
2192 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2193 | process_checks(r1_bio); |
2194 | ||
d11c171e N |
2195 | /* |
2196 | * schedule writes | |
2197 | */ | |
1da177e4 LT |
2198 | atomic_set(&r1_bio->remaining, 1); |
2199 | for (i = 0; i < disks ; i++) { | |
2200 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2201 | if (wbio->bi_end_io == NULL || |
2202 | (wbio->bi_end_io == end_sync_read && | |
2203 | (i == r1_bio->read_disk || | |
2204 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2205 | continue; |
dfcc34c9 ND |
2206 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { |
2207 | abort_sync_write(mddev, r1_bio); | |
0c9d5b12 | 2208 | continue; |
dfcc34c9 | 2209 | } |
1da177e4 | 2210 | |
796a5cf0 | 2211 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
212e7eb7 N |
2212 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2213 | wbio->bi_opf |= MD_FAILFAST; | |
2214 | ||
3e198f78 | 2215 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2216 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2217 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2218 | |
1da177e4 LT |
2219 | generic_make_request(wbio); |
2220 | } | |
2221 | ||
2222 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2223 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2224 | int s = r1_bio->sectors; |
2225 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2226 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2227 | reschedule_retry(r1_bio); | |
2228 | else { | |
2229 | put_buf(r1_bio); | |
2230 | md_done_sync(mddev, s, 1); | |
2231 | } | |
1da177e4 LT |
2232 | } |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * This is a kernel thread which: | |
2237 | * | |
2238 | * 1. Retries failed read operations on working mirrors. | |
2239 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2240 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2241 | */ |
2242 | ||
e8096360 | 2243 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2244 | sector_t sect, int sectors) |
2245 | { | |
fd01b88c | 2246 | struct mddev *mddev = conf->mddev; |
867868fb N |
2247 | while(sectors) { |
2248 | int s = sectors; | |
2249 | int d = read_disk; | |
2250 | int success = 0; | |
2251 | int start; | |
3cb03002 | 2252 | struct md_rdev *rdev; |
867868fb N |
2253 | |
2254 | if (s > (PAGE_SIZE>>9)) | |
2255 | s = PAGE_SIZE >> 9; | |
2256 | ||
2257 | do { | |
d2eb35ac N |
2258 | sector_t first_bad; |
2259 | int bad_sectors; | |
2260 | ||
707a6a42 N |
2261 | rcu_read_lock(); |
2262 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2263 | if (rdev && |
da8840a7 | 2264 | (test_bit(In_sync, &rdev->flags) || |
2265 | (!test_bit(Faulty, &rdev->flags) && | |
2266 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2267 | is_badblock(rdev, sect, s, |
707a6a42 N |
2268 | &first_bad, &bad_sectors) == 0) { |
2269 | atomic_inc(&rdev->nr_pending); | |
2270 | rcu_read_unlock(); | |
2271 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2272 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2273 | success = 1; |
2274 | rdev_dec_pending(rdev, mddev); | |
2275 | if (success) | |
2276 | break; | |
2277 | } else | |
2278 | rcu_read_unlock(); | |
2279 | d++; | |
2280 | if (d == conf->raid_disks * 2) | |
2281 | d = 0; | |
867868fb N |
2282 | } while (!success && d != read_disk); |
2283 | ||
2284 | if (!success) { | |
d8f05d29 | 2285 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2286 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2287 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2288 | md_error(mddev, rdev); | |
867868fb N |
2289 | break; |
2290 | } | |
2291 | /* write it back and re-read */ | |
2292 | start = d; | |
2293 | while (d != read_disk) { | |
2294 | if (d==0) | |
8f19ccb2 | 2295 | d = conf->raid_disks * 2; |
867868fb | 2296 | d--; |
707a6a42 N |
2297 | rcu_read_lock(); |
2298 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2299 | if (rdev && |
707a6a42 N |
2300 | !test_bit(Faulty, &rdev->flags)) { |
2301 | atomic_inc(&rdev->nr_pending); | |
2302 | rcu_read_unlock(); | |
d8f05d29 N |
2303 | r1_sync_page_io(rdev, sect, s, |
2304 | conf->tmppage, WRITE); | |
707a6a42 N |
2305 | rdev_dec_pending(rdev, mddev); |
2306 | } else | |
2307 | rcu_read_unlock(); | |
867868fb N |
2308 | } |
2309 | d = start; | |
2310 | while (d != read_disk) { | |
2311 | char b[BDEVNAME_SIZE]; | |
2312 | if (d==0) | |
8f19ccb2 | 2313 | d = conf->raid_disks * 2; |
867868fb | 2314 | d--; |
707a6a42 N |
2315 | rcu_read_lock(); |
2316 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2317 | if (rdev && |
b8cb6b4c | 2318 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2319 | atomic_inc(&rdev->nr_pending); |
2320 | rcu_read_unlock(); | |
d8f05d29 N |
2321 | if (r1_sync_page_io(rdev, sect, s, |
2322 | conf->tmppage, READ)) { | |
867868fb | 2323 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2324 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2325 | mdname(mddev), s, | |
2326 | (unsigned long long)(sect + | |
2327 | rdev->data_offset), | |
2328 | bdevname(rdev->bdev, b)); | |
867868fb | 2329 | } |
707a6a42 N |
2330 | rdev_dec_pending(rdev, mddev); |
2331 | } else | |
2332 | rcu_read_unlock(); | |
867868fb N |
2333 | } |
2334 | sectors -= s; | |
2335 | sect += s; | |
2336 | } | |
2337 | } | |
2338 | ||
9f2c9d12 | 2339 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2340 | { |
fd01b88c | 2341 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2342 | struct r1conf *conf = mddev->private; |
3cb03002 | 2343 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2344 | |
2345 | /* bio has the data to be written to device 'i' where | |
2346 | * we just recently had a write error. | |
2347 | * We repeatedly clone the bio and trim down to one block, | |
2348 | * then try the write. Where the write fails we record | |
2349 | * a bad block. | |
2350 | * It is conceivable that the bio doesn't exactly align with | |
2351 | * blocks. We must handle this somehow. | |
2352 | * | |
2353 | * We currently own a reference on the rdev. | |
2354 | */ | |
2355 | ||
2356 | int block_sectors; | |
2357 | sector_t sector; | |
2358 | int sectors; | |
2359 | int sect_to_write = r1_bio->sectors; | |
2360 | int ok = 1; | |
2361 | ||
2362 | if (rdev->badblocks.shift < 0) | |
2363 | return 0; | |
2364 | ||
ab713cdc ND |
2365 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2366 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2367 | sector = r1_bio->sector; |
2368 | sectors = ((sector + block_sectors) | |
2369 | & ~(sector_t)(block_sectors - 1)) | |
2370 | - sector; | |
2371 | ||
cd5ff9a1 N |
2372 | while (sect_to_write) { |
2373 | struct bio *wbio; | |
2374 | if (sectors > sect_to_write) | |
2375 | sectors = sect_to_write; | |
2376 | /* Write at 'sector' for 'sectors'*/ | |
2377 | ||
b783863f | 2378 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
841c1316 ML |
2379 | wbio = bio_clone_fast(r1_bio->behind_master_bio, |
2380 | GFP_NOIO, | |
afeee514 | 2381 | &mddev->bio_set); |
b783863f | 2382 | } else { |
d7a10308 | 2383 | wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
afeee514 | 2384 | &mddev->bio_set); |
b783863f KO |
2385 | } |
2386 | ||
796a5cf0 | 2387 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2388 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2389 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2390 | |
6678d83f | 2391 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2392 | wbio->bi_iter.bi_sector += rdev->data_offset; |
74d46992 | 2393 | bio_set_dev(wbio, rdev->bdev); |
4e49ea4a MC |
2394 | |
2395 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2396 | /* failure! */ |
2397 | ok = rdev_set_badblocks(rdev, sector, | |
2398 | sectors, 0) | |
2399 | && ok; | |
2400 | ||
2401 | bio_put(wbio); | |
2402 | sect_to_write -= sectors; | |
2403 | sector += sectors; | |
2404 | sectors = block_sectors; | |
2405 | } | |
2406 | return ok; | |
2407 | } | |
2408 | ||
e8096360 | 2409 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2410 | { |
2411 | int m; | |
2412 | int s = r1_bio->sectors; | |
8f19ccb2 | 2413 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2414 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2415 | struct bio *bio = r1_bio->bios[m]; |
2416 | if (bio->bi_end_io == NULL) | |
2417 | continue; | |
4e4cbee9 | 2418 | if (!bio->bi_status && |
62096bce | 2419 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2420 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2421 | } |
4e4cbee9 | 2422 | if (bio->bi_status && |
62096bce N |
2423 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2424 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2425 | md_error(conf->mddev, rdev); | |
2426 | } | |
2427 | } | |
2428 | put_buf(r1_bio); | |
2429 | md_done_sync(conf->mddev, s, 1); | |
2430 | } | |
2431 | ||
e8096360 | 2432 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2433 | { |
fd76863e | 2434 | int m, idx; |
55ce74d4 | 2435 | bool fail = false; |
fd76863e | 2436 | |
8f19ccb2 | 2437 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2438 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2439 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2440 | rdev_clear_badblocks(rdev, |
2441 | r1_bio->sector, | |
c6563a8c | 2442 | r1_bio->sectors, 0); |
62096bce N |
2443 | rdev_dec_pending(rdev, conf->mddev); |
2444 | } else if (r1_bio->bios[m] != NULL) { | |
2445 | /* This drive got a write error. We need to | |
2446 | * narrow down and record precise write | |
2447 | * errors. | |
2448 | */ | |
55ce74d4 | 2449 | fail = true; |
62096bce N |
2450 | if (!narrow_write_error(r1_bio, m)) { |
2451 | md_error(conf->mddev, | |
2452 | conf->mirrors[m].rdev); | |
2453 | /* an I/O failed, we can't clear the bitmap */ | |
2454 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2455 | } | |
2456 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2457 | conf->mddev); | |
2458 | } | |
55ce74d4 N |
2459 | if (fail) { |
2460 | spin_lock_irq(&conf->device_lock); | |
2461 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2462 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2463 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2464 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2465 | /* |
2466 | * In case freeze_array() is waiting for condition | |
2467 | * get_unqueued_pending() == extra to be true. | |
2468 | */ | |
2469 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2470 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2471 | } else { |
2472 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2473 | close_write(r1_bio); | |
55ce74d4 | 2474 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2475 | } |
62096bce N |
2476 | } |
2477 | ||
e8096360 | 2478 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2479 | { |
fd01b88c | 2480 | struct mddev *mddev = conf->mddev; |
62096bce | 2481 | struct bio *bio; |
3cb03002 | 2482 | struct md_rdev *rdev; |
62096bce N |
2483 | |
2484 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2485 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2486 | * the block and we can fix it. | |
2487 | * We freeze all other IO, and try reading the block from | |
2488 | * other devices. When we find one, we re-write | |
2489 | * and check it that fixes the read error. | |
2490 | * This is all done synchronously while the array is | |
2491 | * frozen | |
2492 | */ | |
7449f699 TM |
2493 | |
2494 | bio = r1_bio->bios[r1_bio->read_disk]; | |
7449f699 TM |
2495 | bio_put(bio); |
2496 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2497 | ||
2e52d449 N |
2498 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2499 | if (mddev->ro == 0 | |
2500 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2501 | freeze_array(conf, 1); |
62096bce N |
2502 | fix_read_error(conf, r1_bio->read_disk, |
2503 | r1_bio->sector, r1_bio->sectors); | |
2504 | unfreeze_array(conf); | |
b33d1062 GK |
2505 | } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { |
2506 | md_error(mddev, rdev); | |
7449f699 TM |
2507 | } else { |
2508 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2509 | } | |
2510 | ||
2e52d449 | 2511 | rdev_dec_pending(rdev, conf->mddev); |
689389a0 N |
2512 | allow_barrier(conf, r1_bio->sector); |
2513 | bio = r1_bio->master_bio; | |
62096bce | 2514 | |
689389a0 N |
2515 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2516 | r1_bio->state = 0; | |
2517 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
62096bce N |
2518 | } |
2519 | ||
4ed8731d | 2520 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2521 | { |
4ed8731d | 2522 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2523 | struct r1bio *r1_bio; |
1da177e4 | 2524 | unsigned long flags; |
e8096360 | 2525 | struct r1conf *conf = mddev->private; |
1da177e4 | 2526 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2527 | struct blk_plug plug; |
fd76863e | 2528 | int idx; |
1da177e4 LT |
2529 | |
2530 | md_check_recovery(mddev); | |
e1dfa0a2 | 2531 | |
55ce74d4 | 2532 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2533 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2534 | LIST_HEAD(tmp); |
2535 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2536 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2537 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2538 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2539 | while (!list_empty(&tmp)) { | |
a452744b MP |
2540 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2541 | retry_list); | |
55ce74d4 | 2542 | list_del(&r1_bio->retry_list); |
fd76863e | 2543 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2544 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2545 | if (mddev->degraded) |
2546 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2547 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2548 | close_write(r1_bio); | |
55ce74d4 N |
2549 | raid_end_bio_io(r1_bio); |
2550 | } | |
2551 | } | |
2552 | ||
e1dfa0a2 | 2553 | blk_start_plug(&plug); |
1da177e4 | 2554 | for (;;) { |
191ea9b2 | 2555 | |
0021b7bc | 2556 | flush_pending_writes(conf); |
191ea9b2 | 2557 | |
a35e63ef N |
2558 | spin_lock_irqsave(&conf->device_lock, flags); |
2559 | if (list_empty(head)) { | |
2560 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2561 | break; |
a35e63ef | 2562 | } |
9f2c9d12 | 2563 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2564 | list_del(head->prev); |
fd76863e | 2565 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2566 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2567 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2568 | ||
2569 | mddev = r1_bio->mddev; | |
070ec55d | 2570 | conf = mddev->private; |
4367af55 | 2571 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2572 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2573 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2574 | handle_sync_write_finished(conf, r1_bio); | |
2575 | else | |
4367af55 | 2576 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2577 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2578 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2579 | handle_write_finished(conf, r1_bio); | |
2580 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2581 | handle_read_error(conf, r1_bio); | |
2582 | else | |
c230e7e5 | 2583 | WARN_ON_ONCE(1); |
62096bce | 2584 | |
1d9d5241 | 2585 | cond_resched(); |
2953079c | 2586 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2587 | md_check_recovery(mddev); |
1da177e4 | 2588 | } |
e1dfa0a2 | 2589 | blk_finish_plug(&plug); |
1da177e4 LT |
2590 | } |
2591 | ||
e8096360 | 2592 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2593 | { |
2594 | int buffs; | |
2595 | ||
2596 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
afeee514 KO |
2597 | BUG_ON(mempool_initialized(&conf->r1buf_pool)); |
2598 | ||
2599 | return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, | |
2600 | r1buf_pool_free, conf->poolinfo); | |
1da177e4 LT |
2601 | } |
2602 | ||
208410b5 SL |
2603 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2604 | { | |
afeee514 | 2605 | struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); |
208410b5 SL |
2606 | struct resync_pages *rps; |
2607 | struct bio *bio; | |
2608 | int i; | |
2609 | ||
2610 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2611 | bio = r1bio->bios[i]; | |
2612 | rps = bio->bi_private; | |
2613 | bio_reset(bio); | |
2614 | bio->bi_private = rps; | |
2615 | } | |
2616 | r1bio->master_bio = NULL; | |
2617 | return r1bio; | |
2618 | } | |
2619 | ||
1da177e4 LT |
2620 | /* |
2621 | * perform a "sync" on one "block" | |
2622 | * | |
2623 | * We need to make sure that no normal I/O request - particularly write | |
2624 | * requests - conflict with active sync requests. | |
2625 | * | |
2626 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2627 | * that can be installed to exclude normal IO requests. | |
2628 | */ | |
2629 | ||
849674e4 SL |
2630 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2631 | int *skipped) | |
1da177e4 | 2632 | { |
e8096360 | 2633 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2634 | struct r1bio *r1_bio; |
1da177e4 LT |
2635 | struct bio *bio; |
2636 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2637 | int disk = -1; |
1da177e4 | 2638 | int i; |
3e198f78 N |
2639 | int wonly = -1; |
2640 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2641 | sector_t sync_blocks; |
e3b9703e | 2642 | int still_degraded = 0; |
06f60385 N |
2643 | int good_sectors = RESYNC_SECTORS; |
2644 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2645 | int idx = sector_to_idx(sector_nr); |
022e510f | 2646 | int page_idx = 0; |
1da177e4 | 2647 | |
afeee514 | 2648 | if (!mempool_initialized(&conf->r1buf_pool)) |
1da177e4 | 2649 | if (init_resync(conf)) |
57afd89f | 2650 | return 0; |
1da177e4 | 2651 | |
58c0fed4 | 2652 | max_sector = mddev->dev_sectors; |
1da177e4 | 2653 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2654 | /* If we aborted, we need to abort the |
2655 | * sync on the 'current' bitmap chunk (there will | |
2656 | * only be one in raid1 resync. | |
2657 | * We can find the current addess in mddev->curr_resync | |
2658 | */ | |
6a806c51 | 2659 | if (mddev->curr_resync < max_sector) /* aborted */ |
e64e4018 AS |
2660 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
2661 | &sync_blocks, 1); | |
6a806c51 | 2662 | else /* completed sync */ |
191ea9b2 | 2663 | conf->fullsync = 0; |
6a806c51 | 2664 | |
e64e4018 | 2665 | md_bitmap_close_sync(mddev->bitmap); |
1da177e4 | 2666 | close_sync(conf); |
c40f341f GR |
2667 | |
2668 | if (mddev_is_clustered(mddev)) { | |
2669 | conf->cluster_sync_low = 0; | |
2670 | conf->cluster_sync_high = 0; | |
c40f341f | 2671 | } |
1da177e4 LT |
2672 | return 0; |
2673 | } | |
2674 | ||
07d84d10 N |
2675 | if (mddev->bitmap == NULL && |
2676 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2677 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2678 | conf->fullsync == 0) { |
2679 | *skipped = 1; | |
2680 | return max_sector - sector_nr; | |
2681 | } | |
6394cca5 N |
2682 | /* before building a request, check if we can skip these blocks.. |
2683 | * This call the bitmap_start_sync doesn't actually record anything | |
2684 | */ | |
e64e4018 | 2685 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2686 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2687 | /* We can skip this block, and probably several more */ |
2688 | *skipped = 1; | |
2689 | return sync_blocks; | |
2690 | } | |
17999be4 | 2691 | |
7ac50447 TM |
2692 | /* |
2693 | * If there is non-resync activity waiting for a turn, then let it | |
2694 | * though before starting on this new sync request. | |
2695 | */ | |
824e47da | 2696 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2697 | schedule_timeout_uninterruptible(1); |
2698 | ||
c40f341f GR |
2699 | /* we are incrementing sector_nr below. To be safe, we check against |
2700 | * sector_nr + two times RESYNC_SECTORS | |
2701 | */ | |
2702 | ||
e64e4018 | 2703 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
c40f341f | 2704 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
17999be4 | 2705 | |
8c242593 YY |
2706 | |
2707 | if (raise_barrier(conf, sector_nr)) | |
2708 | return 0; | |
2709 | ||
2710 | r1_bio = raid1_alloc_init_r1buf(conf); | |
1da177e4 | 2711 | |
3e198f78 | 2712 | rcu_read_lock(); |
1da177e4 | 2713 | /* |
3e198f78 N |
2714 | * If we get a correctably read error during resync or recovery, |
2715 | * we might want to read from a different device. So we | |
2716 | * flag all drives that could conceivably be read from for READ, | |
2717 | * and any others (which will be non-In_sync devices) for WRITE. | |
2718 | * If a read fails, we try reading from something else for which READ | |
2719 | * is OK. | |
1da177e4 | 2720 | */ |
1da177e4 | 2721 | |
1da177e4 LT |
2722 | r1_bio->mddev = mddev; |
2723 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2724 | r1_bio->state = 0; |
1da177e4 | 2725 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2726 | /* make sure good_sectors won't go across barrier unit boundary */ |
2727 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2728 | |
8f19ccb2 | 2729 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2730 | struct md_rdev *rdev; |
1da177e4 | 2731 | bio = r1_bio->bios[i]; |
1da177e4 | 2732 | |
3e198f78 N |
2733 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2734 | if (rdev == NULL || | |
06f60385 | 2735 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2736 | if (i < conf->raid_disks) |
2737 | still_degraded = 1; | |
3e198f78 | 2738 | } else if (!test_bit(In_sync, &rdev->flags)) { |
796a5cf0 | 2739 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
2740 | bio->bi_end_io = end_sync_write; |
2741 | write_targets ++; | |
3e198f78 N |
2742 | } else { |
2743 | /* may need to read from here */ | |
06f60385 N |
2744 | sector_t first_bad = MaxSector; |
2745 | int bad_sectors; | |
2746 | ||
2747 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2748 | &first_bad, &bad_sectors)) { | |
2749 | if (first_bad > sector_nr) | |
2750 | good_sectors = first_bad - sector_nr; | |
2751 | else { | |
2752 | bad_sectors -= (sector_nr - first_bad); | |
2753 | if (min_bad == 0 || | |
2754 | min_bad > bad_sectors) | |
2755 | min_bad = bad_sectors; | |
2756 | } | |
2757 | } | |
2758 | if (sector_nr < first_bad) { | |
2759 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2760 | if (wonly < 0) | |
2761 | wonly = i; | |
2762 | } else { | |
2763 | if (disk < 0) | |
2764 | disk = i; | |
2765 | } | |
796a5cf0 | 2766 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
2767 | bio->bi_end_io = end_sync_read; |
2768 | read_targets++; | |
d57368af AL |
2769 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2770 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2771 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2772 | /* | |
2773 | * The device is suitable for reading (InSync), | |
2774 | * but has bad block(s) here. Let's try to correct them, | |
2775 | * if we are doing resync or repair. Otherwise, leave | |
2776 | * this device alone for this sync request. | |
2777 | */ | |
796a5cf0 | 2778 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
2779 | bio->bi_end_io = end_sync_write; |
2780 | write_targets++; | |
3e198f78 | 2781 | } |
3e198f78 | 2782 | } |
06f60385 N |
2783 | if (bio->bi_end_io) { |
2784 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2785 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2786 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2787 | if (test_bit(FailFast, &rdev->flags)) |
2788 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2789 | } |
1da177e4 | 2790 | } |
3e198f78 N |
2791 | rcu_read_unlock(); |
2792 | if (disk < 0) | |
2793 | disk = wonly; | |
2794 | r1_bio->read_disk = disk; | |
191ea9b2 | 2795 | |
06f60385 N |
2796 | if (read_targets == 0 && min_bad > 0) { |
2797 | /* These sectors are bad on all InSync devices, so we | |
2798 | * need to mark them bad on all write targets | |
2799 | */ | |
2800 | int ok = 1; | |
8f19ccb2 | 2801 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2802 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2803 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2804 | ok = rdev_set_badblocks(rdev, sector_nr, |
2805 | min_bad, 0 | |
2806 | ) && ok; | |
2807 | } | |
2953079c | 2808 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2809 | *skipped = 1; |
2810 | put_buf(r1_bio); | |
2811 | ||
2812 | if (!ok) { | |
2813 | /* Cannot record the badblocks, so need to | |
2814 | * abort the resync. | |
2815 | * If there are multiple read targets, could just | |
2816 | * fail the really bad ones ??? | |
2817 | */ | |
2818 | conf->recovery_disabled = mddev->recovery_disabled; | |
2819 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2820 | return 0; | |
2821 | } else | |
2822 | return min_bad; | |
2823 | ||
2824 | } | |
2825 | if (min_bad > 0 && min_bad < good_sectors) { | |
2826 | /* only resync enough to reach the next bad->good | |
2827 | * transition */ | |
2828 | good_sectors = min_bad; | |
2829 | } | |
2830 | ||
3e198f78 N |
2831 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2832 | /* extra read targets are also write targets */ | |
2833 | write_targets += read_targets-1; | |
2834 | ||
2835 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2836 | /* There is nowhere to write, so all non-sync |
2837 | * drives must be failed - so we are finished | |
2838 | */ | |
b7219ccb N |
2839 | sector_t rv; |
2840 | if (min_bad > 0) | |
2841 | max_sector = sector_nr + min_bad; | |
2842 | rv = max_sector - sector_nr; | |
57afd89f | 2843 | *skipped = 1; |
1da177e4 | 2844 | put_buf(r1_bio); |
1da177e4 LT |
2845 | return rv; |
2846 | } | |
2847 | ||
c6207277 N |
2848 | if (max_sector > mddev->resync_max) |
2849 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2850 | if (max_sector > sector_nr + good_sectors) |
2851 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2852 | nr_sectors = 0; |
289e99e8 | 2853 | sync_blocks = 0; |
1da177e4 LT |
2854 | do { |
2855 | struct page *page; | |
2856 | int len = PAGE_SIZE; | |
2857 | if (sector_nr + (len>>9) > max_sector) | |
2858 | len = (max_sector - sector_nr) << 9; | |
2859 | if (len == 0) | |
2860 | break; | |
6a806c51 | 2861 | if (sync_blocks == 0) { |
e64e4018 AS |
2862 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
2863 | &sync_blocks, still_degraded) && | |
e5de485f N |
2864 | !conf->fullsync && |
2865 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2866 | break; |
7571ae88 | 2867 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2868 | len = sync_blocks<<9; |
ab7a30c7 | 2869 | } |
191ea9b2 | 2870 | |
8f19ccb2 | 2871 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2872 | struct resync_pages *rp; |
2873 | ||
1da177e4 | 2874 | bio = r1_bio->bios[i]; |
98d30c58 | 2875 | rp = get_resync_pages(bio); |
1da177e4 | 2876 | if (bio->bi_end_io) { |
022e510f | 2877 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2878 | |
2879 | /* | |
2880 | * won't fail because the vec table is big | |
2881 | * enough to hold all these pages | |
2882 | */ | |
2883 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2884 | } |
2885 | } | |
2886 | nr_sectors += len>>9; | |
2887 | sector_nr += len>>9; | |
191ea9b2 | 2888 | sync_blocks -= (len>>9); |
022e510f | 2889 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2890 | |
1da177e4 LT |
2891 | r1_bio->sectors = nr_sectors; |
2892 | ||
c40f341f GR |
2893 | if (mddev_is_clustered(mddev) && |
2894 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2895 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2896 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2897 | /* Send resync message */ | |
2898 | md_cluster_ops->resync_info_update(mddev, | |
2899 | conf->cluster_sync_low, | |
2900 | conf->cluster_sync_high); | |
2901 | } | |
2902 | ||
d11c171e N |
2903 | /* For a user-requested sync, we read all readable devices and do a |
2904 | * compare | |
2905 | */ | |
2906 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2907 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2908 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2909 | bio = r1_bio->bios[i]; |
2910 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2911 | read_targets--; |
74d46992 | 2912 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2913 | if (read_targets == 1) |
2914 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e N |
2915 | generic_make_request(bio); |
2916 | } | |
2917 | } | |
2918 | } else { | |
2919 | atomic_set(&r1_bio->remaining, 1); | |
2920 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2921 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2922 | if (read_targets == 1) |
2923 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e | 2924 | generic_make_request(bio); |
d11c171e | 2925 | } |
1da177e4 LT |
2926 | return nr_sectors; |
2927 | } | |
2928 | ||
fd01b88c | 2929 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2930 | { |
2931 | if (sectors) | |
2932 | return sectors; | |
2933 | ||
2934 | return mddev->dev_sectors; | |
2935 | } | |
2936 | ||
e8096360 | 2937 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2938 | { |
e8096360 | 2939 | struct r1conf *conf; |
709ae487 | 2940 | int i; |
0eaf822c | 2941 | struct raid1_info *disk; |
3cb03002 | 2942 | struct md_rdev *rdev; |
709ae487 | 2943 | int err = -ENOMEM; |
1da177e4 | 2944 | |
e8096360 | 2945 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2946 | if (!conf) |
709ae487 | 2947 | goto abort; |
1da177e4 | 2948 | |
fd76863e | 2949 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2950 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2951 | if (!conf->nr_pending) |
2952 | goto abort; | |
2953 | ||
2954 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2955 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2956 | if (!conf->nr_waiting) |
2957 | goto abort; | |
2958 | ||
2959 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2960 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2961 | if (!conf->nr_queued) |
2962 | goto abort; | |
2963 | ||
2964 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2965 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2966 | if (!conf->barrier) |
2967 | goto abort; | |
2968 | ||
6396bb22 KC |
2969 | conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
2970 | mddev->raid_disks, 2), | |
2971 | GFP_KERNEL); | |
1da177e4 | 2972 | if (!conf->mirrors) |
709ae487 | 2973 | goto abort; |
1da177e4 | 2974 | |
ddaf22ab N |
2975 | conf->tmppage = alloc_page(GFP_KERNEL); |
2976 | if (!conf->tmppage) | |
709ae487 | 2977 | goto abort; |
ddaf22ab | 2978 | |
709ae487 | 2979 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2980 | if (!conf->poolinfo) |
709ae487 | 2981 | goto abort; |
8f19ccb2 | 2982 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
3f677f9c | 2983 | err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 2984 | rbio_pool_free, conf->poolinfo); |
afeee514 | 2985 | if (err) |
709ae487 N |
2986 | goto abort; |
2987 | ||
afeee514 KO |
2988 | err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
2989 | if (err) | |
c230e7e5 N |
2990 | goto abort; |
2991 | ||
ed9bfdf1 | 2992 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2993 | |
c19d5798 | 2994 | err = -EINVAL; |
e7e72bf6 | 2995 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2996 | rdev_for_each(rdev, mddev) { |
709ae487 | 2997 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2998 | if (disk_idx >= mddev->raid_disks |
2999 | || disk_idx < 0) | |
3000 | continue; | |
c19d5798 | 3001 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 3002 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
3003 | else |
3004 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 3005 | |
c19d5798 N |
3006 | if (disk->rdev) |
3007 | goto abort; | |
1da177e4 | 3008 | disk->rdev = rdev; |
1da177e4 | 3009 | disk->head_position = 0; |
12cee5a8 | 3010 | disk->seq_start = MaxSector; |
1da177e4 LT |
3011 | } |
3012 | conf->raid_disks = mddev->raid_disks; | |
3013 | conf->mddev = mddev; | |
1da177e4 | 3014 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 3015 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
3016 | |
3017 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 3018 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 3019 | |
191ea9b2 | 3020 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 3021 | conf->pending_count = 0; |
d890fa2b | 3022 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 3023 | |
c19d5798 | 3024 | err = -EIO; |
8f19ccb2 | 3025 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
3026 | |
3027 | disk = conf->mirrors + i; | |
3028 | ||
c19d5798 N |
3029 | if (i < conf->raid_disks && |
3030 | disk[conf->raid_disks].rdev) { | |
3031 | /* This slot has a replacement. */ | |
3032 | if (!disk->rdev) { | |
3033 | /* No original, just make the replacement | |
3034 | * a recovering spare | |
3035 | */ | |
3036 | disk->rdev = | |
3037 | disk[conf->raid_disks].rdev; | |
3038 | disk[conf->raid_disks].rdev = NULL; | |
3039 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
3040 | /* Original is not in_sync - bad */ | |
3041 | goto abort; | |
3042 | } | |
3043 | ||
5fd6c1dc N |
3044 | if (!disk->rdev || |
3045 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3046 | disk->head_position = 0; |
4f0a5e01 JB |
3047 | if (disk->rdev && |
3048 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3049 | conf->fullsync = 1; |
be4d3280 | 3050 | } |
1da177e4 | 3051 | } |
709ae487 | 3052 | |
709ae487 | 3053 | err = -ENOMEM; |
0232605d | 3054 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 3055 | if (!conf->thread) |
709ae487 | 3056 | goto abort; |
1da177e4 | 3057 | |
709ae487 N |
3058 | return conf; |
3059 | ||
3060 | abort: | |
3061 | if (conf) { | |
afeee514 | 3062 | mempool_exit(&conf->r1bio_pool); |
709ae487 N |
3063 | kfree(conf->mirrors); |
3064 | safe_put_page(conf->tmppage); | |
3065 | kfree(conf->poolinfo); | |
fd76863e | 3066 | kfree(conf->nr_pending); |
3067 | kfree(conf->nr_waiting); | |
3068 | kfree(conf->nr_queued); | |
3069 | kfree(conf->barrier); | |
afeee514 | 3070 | bioset_exit(&conf->bio_split); |
709ae487 N |
3071 | kfree(conf); |
3072 | } | |
3073 | return ERR_PTR(err); | |
3074 | } | |
3075 | ||
afa0f557 | 3076 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3077 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3078 | { |
e8096360 | 3079 | struct r1conf *conf; |
709ae487 | 3080 | int i; |
3cb03002 | 3081 | struct md_rdev *rdev; |
5220ea1e | 3082 | int ret; |
2ff8cc2c | 3083 | bool discard_supported = false; |
709ae487 N |
3084 | |
3085 | if (mddev->level != 1) { | |
1d41c216 N |
3086 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3087 | mdname(mddev), mddev->level); | |
709ae487 N |
3088 | return -EIO; |
3089 | } | |
3090 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3091 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3092 | mdname(mddev)); | |
709ae487 N |
3093 | return -EIO; |
3094 | } | |
a415c0f1 N |
3095 | if (mddev_init_writes_pending(mddev) < 0) |
3096 | return -ENOMEM; | |
1da177e4 | 3097 | /* |
709ae487 N |
3098 | * copy the already verified devices into our private RAID1 |
3099 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3100 | * should be freed in raid1_free()] |
1da177e4 | 3101 | */ |
709ae487 N |
3102 | if (mddev->private == NULL) |
3103 | conf = setup_conf(mddev); | |
3104 | else | |
3105 | conf = mddev->private; | |
1da177e4 | 3106 | |
709ae487 N |
3107 | if (IS_ERR(conf)) |
3108 | return PTR_ERR(conf); | |
1da177e4 | 3109 | |
3deff1a7 | 3110 | if (mddev->queue) { |
5026d7a9 | 3111 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 CH |
3112 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
3113 | } | |
5026d7a9 | 3114 | |
dafb20fa | 3115 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3116 | if (!mddev->gendisk) |
3117 | continue; | |
709ae487 N |
3118 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3119 | rdev->data_offset << 9); | |
2ff8cc2c SL |
3120 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
3121 | discard_supported = true; | |
1da177e4 | 3122 | } |
191ea9b2 | 3123 | |
709ae487 | 3124 | mddev->degraded = 0; |
ebfeb444 | 3125 | for (i = 0; i < conf->raid_disks; i++) |
709ae487 N |
3126 | if (conf->mirrors[i].rdev == NULL || |
3127 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3128 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3129 | mddev->degraded++; | |
3130 | ||
3131 | if (conf->raid_disks - mddev->degraded == 1) | |
3132 | mddev->recovery_cp = MaxSector; | |
3133 | ||
8c6ac868 | 3134 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3135 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3136 | mdname(mddev)); | |
3137 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3138 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3139 | mddev->raid_disks); |
709ae487 | 3140 | |
1da177e4 LT |
3141 | /* |
3142 | * Ok, everything is just fine now | |
3143 | */ | |
709ae487 N |
3144 | mddev->thread = conf->thread; |
3145 | conf->thread = NULL; | |
3146 | mddev->private = conf; | |
46533ff7 | 3147 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3148 | |
1f403624 | 3149 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3150 | |
1ed7242e | 3151 | if (mddev->queue) { |
2ff8cc2c | 3152 | if (discard_supported) |
8b904b5b | 3153 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, |
2ff8cc2c SL |
3154 | mddev->queue); |
3155 | else | |
8b904b5b | 3156 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, |
2ff8cc2c | 3157 | mddev->queue); |
1ed7242e | 3158 | } |
5220ea1e | 3159 | |
ebfeb444 | 3160 | ret = md_integrity_register(mddev); |
5aa61f42 N |
3161 | if (ret) { |
3162 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 3163 | raid1_free(mddev, conf); |
5aa61f42 | 3164 | } |
5220ea1e | 3165 | return ret; |
1da177e4 LT |
3166 | } |
3167 | ||
afa0f557 | 3168 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3169 | { |
afa0f557 | 3170 | struct r1conf *conf = priv; |
409c57f3 | 3171 | |
afeee514 | 3172 | mempool_exit(&conf->r1bio_pool); |
990a8baf | 3173 | kfree(conf->mirrors); |
0fea7ed8 | 3174 | safe_put_page(conf->tmppage); |
990a8baf | 3175 | kfree(conf->poolinfo); |
fd76863e | 3176 | kfree(conf->nr_pending); |
3177 | kfree(conf->nr_waiting); | |
3178 | kfree(conf->nr_queued); | |
3179 | kfree(conf->barrier); | |
afeee514 | 3180 | bioset_exit(&conf->bio_split); |
1da177e4 | 3181 | kfree(conf); |
1da177e4 LT |
3182 | } |
3183 | ||
fd01b88c | 3184 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3185 | { |
3186 | /* no resync is happening, and there is enough space | |
3187 | * on all devices, so we can resize. | |
3188 | * We need to make sure resync covers any new space. | |
3189 | * If the array is shrinking we should possibly wait until | |
3190 | * any io in the removed space completes, but it hardly seems | |
3191 | * worth it. | |
3192 | */ | |
a4a6125a N |
3193 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3194 | if (mddev->external_size && | |
3195 | mddev->array_sectors > newsize) | |
b522adcd | 3196 | return -EINVAL; |
a4a6125a | 3197 | if (mddev->bitmap) { |
e64e4018 | 3198 | int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
a4a6125a N |
3199 | if (ret) |
3200 | return ret; | |
3201 | } | |
3202 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3203 | if (sectors > mddev->dev_sectors && |
b098636c | 3204 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3205 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3206 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3207 | } | |
b522adcd | 3208 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3209 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3210 | return 0; |
3211 | } | |
3212 | ||
fd01b88c | 3213 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3214 | { |
3215 | /* We need to: | |
3216 | * 1/ resize the r1bio_pool | |
3217 | * 2/ resize conf->mirrors | |
3218 | * | |
3219 | * We allocate a new r1bio_pool if we can. | |
3220 | * Then raise a device barrier and wait until all IO stops. | |
3221 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3222 | * |
3223 | * At the same time, we "pack" the devices so that all the missing | |
3224 | * devices have the higher raid_disk numbers. | |
1da177e4 | 3225 | */ |
afeee514 | 3226 | mempool_t newpool, oldpool; |
1da177e4 | 3227 | struct pool_info *newpoolinfo; |
0eaf822c | 3228 | struct raid1_info *newmirrors; |
e8096360 | 3229 | struct r1conf *conf = mddev->private; |
63c70c4f | 3230 | int cnt, raid_disks; |
c04be0aa | 3231 | unsigned long flags; |
2214c260 | 3232 | int d, d2; |
afeee514 KO |
3233 | int ret; |
3234 | ||
3235 | memset(&newpool, 0, sizeof(newpool)); | |
3236 | memset(&oldpool, 0, sizeof(oldpool)); | |
1da177e4 | 3237 | |
63c70c4f | 3238 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3239 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3240 | mddev->layout != mddev->new_layout || |
3241 | mddev->level != mddev->new_level) { | |
664e7c41 | 3242 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3243 | mddev->new_layout = mddev->layout; |
3244 | mddev->new_level = mddev->level; | |
3245 | return -EINVAL; | |
3246 | } | |
3247 | ||
2214c260 AP |
3248 | if (!mddev_is_clustered(mddev)) |
3249 | md_allow_write(mddev); | |
2a2275d6 | 3250 | |
63c70c4f N |
3251 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3252 | ||
6ea9c07c N |
3253 | if (raid_disks < conf->raid_disks) { |
3254 | cnt=0; | |
3255 | for (d= 0; d < conf->raid_disks; d++) | |
3256 | if (conf->mirrors[d].rdev) | |
3257 | cnt++; | |
3258 | if (cnt > raid_disks) | |
1da177e4 | 3259 | return -EBUSY; |
6ea9c07c | 3260 | } |
1da177e4 LT |
3261 | |
3262 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3263 | if (!newpoolinfo) | |
3264 | return -ENOMEM; | |
3265 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3266 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 | 3267 | |
3f677f9c | 3268 | ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 3269 | rbio_pool_free, newpoolinfo); |
afeee514 | 3270 | if (ret) { |
1da177e4 | 3271 | kfree(newpoolinfo); |
afeee514 | 3272 | return ret; |
1da177e4 | 3273 | } |
6396bb22 KC |
3274 | newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
3275 | raid_disks, 2), | |
8f19ccb2 | 3276 | GFP_KERNEL); |
1da177e4 LT |
3277 | if (!newmirrors) { |
3278 | kfree(newpoolinfo); | |
afeee514 | 3279 | mempool_exit(&newpool); |
1da177e4 LT |
3280 | return -ENOMEM; |
3281 | } | |
1da177e4 | 3282 | |
e2d59925 | 3283 | freeze_array(conf, 0); |
1da177e4 LT |
3284 | |
3285 | /* ok, everything is stopped */ | |
3286 | oldpool = conf->r1bio_pool; | |
3287 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3288 | |
a88aa786 | 3289 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3290 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3291 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3292 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3293 | rdev->raid_disk = d2; |
36fad858 NK |
3294 | sysfs_unlink_rdev(mddev, rdev); |
3295 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3296 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3297 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3298 | } |
a88aa786 N |
3299 | if (rdev) |
3300 | newmirrors[d2++].rdev = rdev; | |
3301 | } | |
1da177e4 LT |
3302 | kfree(conf->mirrors); |
3303 | conf->mirrors = newmirrors; | |
3304 | kfree(conf->poolinfo); | |
3305 | conf->poolinfo = newpoolinfo; | |
3306 | ||
c04be0aa | 3307 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3308 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3309 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3310 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3311 | mddev->delta_disks = 0; |
1da177e4 | 3312 | |
e2d59925 | 3313 | unfreeze_array(conf); |
1da177e4 | 3314 | |
985ca973 | 3315 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3316 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3317 | md_wakeup_thread(mddev->thread); | |
3318 | ||
afeee514 | 3319 | mempool_exit(&oldpool); |
1da177e4 LT |
3320 | return 0; |
3321 | } | |
3322 | ||
b03e0ccb | 3323 | static void raid1_quiesce(struct mddev *mddev, int quiesce) |
36fa3063 | 3324 | { |
e8096360 | 3325 | struct r1conf *conf = mddev->private; |
36fa3063 | 3326 | |
b03e0ccb | 3327 | if (quiesce) |
07169fd4 | 3328 | freeze_array(conf, 0); |
b03e0ccb | 3329 | else |
07169fd4 | 3330 | unfreeze_array(conf); |
36fa3063 N |
3331 | } |
3332 | ||
fd01b88c | 3333 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3334 | { |
3335 | /* raid1 can take over: | |
3336 | * raid5 with 2 devices, any layout or chunk size | |
3337 | */ | |
3338 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3339 | struct r1conf *conf; |
709ae487 N |
3340 | mddev->new_level = 1; |
3341 | mddev->new_layout = 0; | |
3342 | mddev->new_chunk_sectors = 0; | |
3343 | conf = setup_conf(mddev); | |
6995f0b2 | 3344 | if (!IS_ERR(conf)) { |
07169fd4 | 3345 | /* Array must appear to be quiesced */ |
3346 | conf->array_frozen = 1; | |
394ed8e4 SL |
3347 | mddev_clear_unsupported_flags(mddev, |
3348 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3349 | } |
709ae487 N |
3350 | return conf; |
3351 | } | |
3352 | return ERR_PTR(-EINVAL); | |
3353 | } | |
1da177e4 | 3354 | |
84fc4b56 | 3355 | static struct md_personality raid1_personality = |
1da177e4 LT |
3356 | { |
3357 | .name = "raid1", | |
2604b703 | 3358 | .level = 1, |
1da177e4 | 3359 | .owner = THIS_MODULE, |
849674e4 SL |
3360 | .make_request = raid1_make_request, |
3361 | .run = raid1_run, | |
afa0f557 | 3362 | .free = raid1_free, |
849674e4 SL |
3363 | .status = raid1_status, |
3364 | .error_handler = raid1_error, | |
1da177e4 LT |
3365 | .hot_add_disk = raid1_add_disk, |
3366 | .hot_remove_disk= raid1_remove_disk, | |
3367 | .spare_active = raid1_spare_active, | |
849674e4 | 3368 | .sync_request = raid1_sync_request, |
1da177e4 | 3369 | .resize = raid1_resize, |
80c3a6ce | 3370 | .size = raid1_size, |
63c70c4f | 3371 | .check_reshape = raid1_reshape, |
36fa3063 | 3372 | .quiesce = raid1_quiesce, |
709ae487 | 3373 | .takeover = raid1_takeover, |
5c675f83 | 3374 | .congested = raid1_congested, |
1da177e4 LT |
3375 | }; |
3376 | ||
3377 | static int __init raid_init(void) | |
3378 | { | |
2604b703 | 3379 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3380 | } |
3381 | ||
3382 | static void raid_exit(void) | |
3383 | { | |
2604b703 | 3384 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3385 | } |
3386 | ||
3387 | module_init(raid_init); | |
3388 | module_exit(raid_exit); | |
3389 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3390 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3391 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3392 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3393 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3394 | |
3395 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |