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 | ||
98d30c58 ML |
53 | /* |
54 | * for resync bio, r1bio pointer can be retrieved from the per-bio | |
55 | * 'struct resync_pages'. | |
56 | */ | |
57 | static inline struct r1bio *get_resync_r1bio(struct bio *bio) | |
58 | { | |
59 | return get_resync_pages(bio)->raid_bio; | |
60 | } | |
61 | ||
dd0fc66f | 62 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
63 | { |
64 | struct pool_info *pi = data; | |
9f2c9d12 | 65 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
66 | |
67 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 68 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
69 | } |
70 | ||
71 | static void r1bio_pool_free(void *r1_bio, void *data) | |
72 | { | |
73 | kfree(r1_bio); | |
74 | } | |
75 | ||
8e005f7c | 76 | #define RESYNC_DEPTH 32 |
1da177e4 | 77 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 78 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
79 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
80 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
81 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 82 | |
dd0fc66f | 83 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
84 | { |
85 | struct pool_info *pi = data; | |
9f2c9d12 | 86 | struct r1bio *r1_bio; |
1da177e4 | 87 | struct bio *bio; |
da1aab3d | 88 | int need_pages; |
98d30c58 ML |
89 | int j; |
90 | struct resync_pages *rps; | |
1da177e4 LT |
91 | |
92 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 93 | if (!r1_bio) |
1da177e4 | 94 | return NULL; |
1da177e4 | 95 | |
6da2ec56 KC |
96 | rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), |
97 | gfp_flags); | |
98d30c58 ML |
98 | if (!rps) |
99 | goto out_free_r1bio; | |
100 | ||
1da177e4 LT |
101 | /* |
102 | * Allocate bios : 1 for reading, n-1 for writing | |
103 | */ | |
104 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 105 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
106 | if (!bio) |
107 | goto out_free_bio; | |
108 | r1_bio->bios[j] = bio; | |
109 | } | |
110 | /* | |
111 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
112 | * the first bio. |
113 | * If this is a user-requested check/repair, allocate | |
114 | * RESYNC_PAGES for each bio. | |
1da177e4 | 115 | */ |
d11c171e | 116 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 117 | need_pages = pi->raid_disks; |
d11c171e | 118 | else |
da1aab3d | 119 | need_pages = 1; |
98d30c58 ML |
120 | for (j = 0; j < pi->raid_disks; j++) { |
121 | struct resync_pages *rp = &rps[j]; | |
122 | ||
d11c171e | 123 | bio = r1_bio->bios[j]; |
d11c171e | 124 | |
98d30c58 ML |
125 | if (j < need_pages) { |
126 | if (resync_alloc_pages(rp, gfp_flags)) | |
127 | goto out_free_pages; | |
128 | } else { | |
129 | memcpy(rp, &rps[0], sizeof(*rp)); | |
130 | resync_get_all_pages(rp); | |
131 | } | |
132 | ||
98d30c58 ML |
133 | rp->raid_bio = r1_bio; |
134 | bio->bi_private = rp; | |
1da177e4 LT |
135 | } |
136 | ||
137 | r1_bio->master_bio = NULL; | |
138 | ||
139 | return r1_bio; | |
140 | ||
da1aab3d | 141 | out_free_pages: |
491221f8 | 142 | while (--j >= 0) |
98d30c58 | 143 | resync_free_pages(&rps[j]); |
da1aab3d | 144 | |
1da177e4 | 145 | out_free_bio: |
8f19ccb2 | 146 | while (++j < pi->raid_disks) |
1da177e4 | 147 | bio_put(r1_bio->bios[j]); |
98d30c58 ML |
148 | kfree(rps); |
149 | ||
150 | out_free_r1bio: | |
1da177e4 LT |
151 | r1bio_pool_free(r1_bio, data); |
152 | return NULL; | |
153 | } | |
154 | ||
155 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
156 | { | |
157 | struct pool_info *pi = data; | |
98d30c58 | 158 | int i; |
9f2c9d12 | 159 | struct r1bio *r1bio = __r1_bio; |
98d30c58 | 160 | struct resync_pages *rp = NULL; |
1da177e4 | 161 | |
98d30c58 ML |
162 | for (i = pi->raid_disks; i--; ) { |
163 | rp = get_resync_pages(r1bio->bios[i]); | |
164 | resync_free_pages(rp); | |
1da177e4 | 165 | bio_put(r1bio->bios[i]); |
98d30c58 ML |
166 | } |
167 | ||
168 | /* resync pages array stored in the 1st bio's .bi_private */ | |
169 | kfree(rp); | |
1da177e4 LT |
170 | |
171 | r1bio_pool_free(r1bio, data); | |
172 | } | |
173 | ||
e8096360 | 174 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
175 | { |
176 | int i; | |
177 | ||
8f19ccb2 | 178 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 179 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 180 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
181 | bio_put(*bio); |
182 | *bio = NULL; | |
183 | } | |
184 | } | |
185 | ||
9f2c9d12 | 186 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 187 | { |
e8096360 | 188 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 189 | |
1da177e4 | 190 | put_all_bios(conf, r1_bio); |
afeee514 | 191 | mempool_free(r1_bio, &conf->r1bio_pool); |
1da177e4 LT |
192 | } |
193 | ||
9f2c9d12 | 194 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 195 | { |
e8096360 | 196 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 197 | sector_t sect = r1_bio->sector; |
3e198f78 N |
198 | int i; |
199 | ||
8f19ccb2 | 200 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
201 | struct bio *bio = r1_bio->bios[i]; |
202 | if (bio->bi_end_io) | |
203 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
204 | } | |
1da177e4 | 205 | |
afeee514 | 206 | mempool_free(r1_bio, &conf->r1buf_pool); |
1da177e4 | 207 | |
af5f42a7 | 208 | lower_barrier(conf, sect); |
1da177e4 LT |
209 | } |
210 | ||
9f2c9d12 | 211 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
212 | { |
213 | unsigned long flags; | |
fd01b88c | 214 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 215 | struct r1conf *conf = mddev->private; |
fd76863e | 216 | int idx; |
1da177e4 | 217 | |
fd76863e | 218 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
219 | spin_lock_irqsave(&conf->device_lock, flags); |
220 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 221 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
222 | spin_unlock_irqrestore(&conf->device_lock, flags); |
223 | ||
17999be4 | 224 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
225 | md_wakeup_thread(mddev->thread); |
226 | } | |
227 | ||
228 | /* | |
229 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
230 | * operation and are ready to return a success/failure code to the buffer | |
231 | * cache layer. | |
232 | */ | |
9f2c9d12 | 233 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
234 | { |
235 | struct bio *bio = r1_bio->master_bio; | |
e8096360 | 236 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
237 | |
238 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4e4cbee9 | 239 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 240 | |
37011e3a N |
241 | bio_endio(bio); |
242 | /* | |
243 | * Wake up any possible resync thread that waits for the device | |
244 | * to go idle. | |
245 | */ | |
246 | allow_barrier(conf, r1_bio->sector); | |
d2eb35ac N |
247 | } |
248 | ||
9f2c9d12 | 249 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
250 | { |
251 | struct bio *bio = r1_bio->master_bio; | |
252 | ||
4b6d287f N |
253 | /* if nobody has done the final endio yet, do it now */ |
254 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
255 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
256 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
257 | (unsigned long long) bio->bi_iter.bi_sector, |
258 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 259 | |
d2eb35ac | 260 | call_bio_endio(r1_bio); |
4b6d287f | 261 | } |
1da177e4 LT |
262 | free_r1bio(r1_bio); |
263 | } | |
264 | ||
265 | /* | |
266 | * Update disk head position estimator based on IRQ completion info. | |
267 | */ | |
9f2c9d12 | 268 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 269 | { |
e8096360 | 270 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
271 | |
272 | conf->mirrors[disk].head_position = | |
273 | r1_bio->sector + (r1_bio->sectors); | |
274 | } | |
275 | ||
ba3ae3be NK |
276 | /* |
277 | * Find the disk number which triggered given bio | |
278 | */ | |
9f2c9d12 | 279 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
280 | { |
281 | int mirror; | |
30194636 N |
282 | struct r1conf *conf = r1_bio->mddev->private; |
283 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 284 | |
8f19ccb2 | 285 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
286 | if (r1_bio->bios[mirror] == bio) |
287 | break; | |
288 | ||
8f19ccb2 | 289 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
290 | update_head_pos(mirror, r1_bio); |
291 | ||
292 | return mirror; | |
293 | } | |
294 | ||
4246a0b6 | 295 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 296 | { |
4e4cbee9 | 297 | int uptodate = !bio->bi_status; |
9f2c9d12 | 298 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 299 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 300 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 301 | |
1da177e4 LT |
302 | /* |
303 | * this branch is our 'one mirror IO has finished' event handler: | |
304 | */ | |
e5872d58 | 305 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 306 | |
dd00a99e N |
307 | if (uptodate) |
308 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
309 | else if (test_bit(FailFast, &rdev->flags) && |
310 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
311 | /* This was a fail-fast read so we definitely | |
312 | * want to retry */ | |
313 | ; | |
dd00a99e N |
314 | else { |
315 | /* If all other devices have failed, we want to return | |
316 | * the error upwards rather than fail the last device. | |
317 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 318 | */ |
dd00a99e N |
319 | unsigned long flags; |
320 | spin_lock_irqsave(&conf->device_lock, flags); | |
321 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
322 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 323 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
324 | uptodate = 1; |
325 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
326 | } | |
1da177e4 | 327 | |
7ad4d4a6 | 328 | if (uptodate) { |
1da177e4 | 329 | raid_end_bio_io(r1_bio); |
e5872d58 | 330 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 331 | } else { |
1da177e4 LT |
332 | /* |
333 | * oops, read error: | |
334 | */ | |
335 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
336 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
337 | mdname(conf->mddev), | |
338 | bdevname(rdev->bdev, b), | |
339 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 340 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 341 | reschedule_retry(r1_bio); |
7ad4d4a6 | 342 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 343 | } |
1da177e4 LT |
344 | } |
345 | ||
9f2c9d12 | 346 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
347 | { |
348 | /* it really is the end of this request */ | |
349 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
350 | bio_free_pages(r1_bio->behind_master_bio); |
351 | bio_put(r1_bio->behind_master_bio); | |
352 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
353 | } |
354 | /* clear the bitmap if all writes complete successfully */ | |
e64e4018 AS |
355 | md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
356 | r1_bio->sectors, | |
357 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
358 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
cd5ff9a1 N |
359 | md_write_end(r1_bio->mddev); |
360 | } | |
361 | ||
9f2c9d12 | 362 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 363 | { |
cd5ff9a1 N |
364 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
365 | return; | |
366 | ||
367 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
368 | reschedule_retry(r1_bio); | |
369 | else { | |
370 | close_write(r1_bio); | |
4367af55 N |
371 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
372 | reschedule_retry(r1_bio); | |
373 | else | |
374 | raid_end_bio_io(r1_bio); | |
4e78064f N |
375 | } |
376 | } | |
377 | ||
4246a0b6 | 378 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 379 | { |
9f2c9d12 | 380 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 381 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 382 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 383 | struct bio *to_put = NULL; |
e5872d58 N |
384 | int mirror = find_bio_disk(r1_bio, bio); |
385 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
386 | bool discard_error; |
387 | ||
4e4cbee9 | 388 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 389 | |
e9c7469b TH |
390 | /* |
391 | * 'one mirror IO has finished' event handler: | |
392 | */ | |
4e4cbee9 | 393 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
394 | set_bit(WriteErrorSeen, &rdev->flags); |
395 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
396 | set_bit(MD_RECOVERY_NEEDED, & |
397 | conf->mddev->recovery); | |
398 | ||
212e7eb7 N |
399 | if (test_bit(FailFast, &rdev->flags) && |
400 | (bio->bi_opf & MD_FAILFAST) && | |
401 | /* We never try FailFast to WriteMostly devices */ | |
402 | !test_bit(WriteMostly, &rdev->flags)) { | |
403 | md_error(r1_bio->mddev, rdev); | |
404 | if (!test_bit(Faulty, &rdev->flags)) | |
405 | /* This is the only remaining device, | |
406 | * We need to retry the write without | |
407 | * FailFast | |
408 | */ | |
409 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
410 | else { | |
411 | /* Finished with this branch */ | |
412 | r1_bio->bios[mirror] = NULL; | |
413 | to_put = bio; | |
414 | } | |
415 | } else | |
416 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 417 | } else { |
1da177e4 | 418 | /* |
e9c7469b TH |
419 | * Set R1BIO_Uptodate in our master bio, so that we |
420 | * will return a good error code for to the higher | |
421 | * levels even if IO on some other mirrored buffer | |
422 | * fails. | |
423 | * | |
424 | * The 'master' represents the composite IO operation | |
425 | * to user-side. So if something waits for IO, then it | |
426 | * will wait for the 'master' bio. | |
1da177e4 | 427 | */ |
4367af55 N |
428 | sector_t first_bad; |
429 | int bad_sectors; | |
430 | ||
cd5ff9a1 N |
431 | r1_bio->bios[mirror] = NULL; |
432 | to_put = bio; | |
3056e3ae AL |
433 | /* |
434 | * Do not set R1BIO_Uptodate if the current device is | |
435 | * rebuilding or Faulty. This is because we cannot use | |
436 | * such device for properly reading the data back (we could | |
437 | * potentially use it, if the current write would have felt | |
438 | * before rdev->recovery_offset, but for simplicity we don't | |
439 | * check this here. | |
440 | */ | |
e5872d58 N |
441 | if (test_bit(In_sync, &rdev->flags) && |
442 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 443 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 444 | |
4367af55 | 445 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 446 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 447 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
448 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
449 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
450 | } | |
451 | } | |
452 | ||
e9c7469b | 453 | if (behind) { |
e5872d58 | 454 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
455 | atomic_dec(&r1_bio->behind_remaining); |
456 | ||
457 | /* | |
458 | * In behind mode, we ACK the master bio once the I/O | |
459 | * has safely reached all non-writemostly | |
460 | * disks. Setting the Returned bit ensures that this | |
461 | * gets done only once -- we don't ever want to return | |
462 | * -EIO here, instead we'll wait | |
463 | */ | |
464 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
465 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
466 | /* Maybe we can return now */ | |
467 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
468 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
469 | pr_debug("raid1: behind end write sectors" |
470 | " %llu-%llu\n", | |
4f024f37 KO |
471 | (unsigned long long) mbio->bi_iter.bi_sector, |
472 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 473 | call_bio_endio(r1_bio); |
4b6d287f N |
474 | } |
475 | } | |
476 | } | |
4367af55 | 477 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 478 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 479 | |
1da177e4 | 480 | /* |
1da177e4 LT |
481 | * Let's see if all mirrored write operations have finished |
482 | * already. | |
483 | */ | |
af6d7b76 | 484 | r1_bio_write_done(r1_bio); |
c70810b3 | 485 | |
04b857f7 N |
486 | if (to_put) |
487 | bio_put(to_put); | |
1da177e4 LT |
488 | } |
489 | ||
fd76863e | 490 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
491 | sector_t sectors) | |
492 | { | |
493 | sector_t len; | |
494 | ||
495 | WARN_ON(sectors == 0); | |
496 | /* | |
497 | * len is the number of sectors from start_sector to end of the | |
498 | * barrier unit which start_sector belongs to. | |
499 | */ | |
500 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
501 | start_sector; | |
502 | ||
503 | if (len > sectors) | |
504 | len = sectors; | |
505 | ||
506 | return len; | |
507 | } | |
508 | ||
1da177e4 LT |
509 | /* |
510 | * This routine returns the disk from which the requested read should | |
511 | * be done. There is a per-array 'next expected sequential IO' sector | |
512 | * number - if this matches on the next IO then we use the last disk. | |
513 | * There is also a per-disk 'last know head position' sector that is | |
514 | * maintained from IRQ contexts, both the normal and the resync IO | |
515 | * completion handlers update this position correctly. If there is no | |
516 | * perfect sequential match then we pick the disk whose head is closest. | |
517 | * | |
518 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
519 | * because position is mirror, not device based. | |
520 | * | |
521 | * The rdev for the device selected will have nr_pending incremented. | |
522 | */ | |
e8096360 | 523 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 524 | { |
af3a2cd6 | 525 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
526 | int sectors; |
527 | int best_good_sectors; | |
9dedf603 SL |
528 | int best_disk, best_dist_disk, best_pending_disk; |
529 | int has_nonrot_disk; | |
be4d3280 | 530 | int disk; |
76073054 | 531 | sector_t best_dist; |
9dedf603 | 532 | unsigned int min_pending; |
3cb03002 | 533 | struct md_rdev *rdev; |
f3ac8bf7 | 534 | int choose_first; |
12cee5a8 | 535 | int choose_next_idle; |
1da177e4 LT |
536 | |
537 | rcu_read_lock(); | |
538 | /* | |
8ddf9efe | 539 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
540 | * device if no resync is going on, or below the resync window. |
541 | * We take the first readable disk when above the resync window. | |
542 | */ | |
543 | retry: | |
d2eb35ac | 544 | sectors = r1_bio->sectors; |
76073054 | 545 | best_disk = -1; |
9dedf603 | 546 | best_dist_disk = -1; |
76073054 | 547 | best_dist = MaxSector; |
9dedf603 SL |
548 | best_pending_disk = -1; |
549 | min_pending = UINT_MAX; | |
d2eb35ac | 550 | best_good_sectors = 0; |
9dedf603 | 551 | has_nonrot_disk = 0; |
12cee5a8 | 552 | choose_next_idle = 0; |
2e52d449 | 553 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 554 | |
7d49ffcf GR |
555 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
556 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 557 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
558 | this_sector + sectors))) |
559 | choose_first = 1; | |
560 | else | |
561 | choose_first = 0; | |
1da177e4 | 562 | |
be4d3280 | 563 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 564 | sector_t dist; |
d2eb35ac N |
565 | sector_t first_bad; |
566 | int bad_sectors; | |
9dedf603 | 567 | unsigned int pending; |
12cee5a8 | 568 | bool nonrot; |
d2eb35ac | 569 | |
f3ac8bf7 N |
570 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
571 | if (r1_bio->bios[disk] == IO_BLOCKED | |
572 | || rdev == NULL | |
76073054 | 573 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 574 | continue; |
76073054 N |
575 | if (!test_bit(In_sync, &rdev->flags) && |
576 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 577 | continue; |
76073054 N |
578 | if (test_bit(WriteMostly, &rdev->flags)) { |
579 | /* Don't balance among write-mostly, just | |
580 | * use the first as a last resort */ | |
d1901ef0 | 581 | if (best_dist_disk < 0) { |
307729c8 N |
582 | if (is_badblock(rdev, this_sector, sectors, |
583 | &first_bad, &bad_sectors)) { | |
816b0acf | 584 | if (first_bad <= this_sector) |
307729c8 N |
585 | /* Cannot use this */ |
586 | continue; | |
587 | best_good_sectors = first_bad - this_sector; | |
588 | } else | |
589 | best_good_sectors = sectors; | |
d1901ef0 TH |
590 | best_dist_disk = disk; |
591 | best_pending_disk = disk; | |
307729c8 | 592 | } |
76073054 N |
593 | continue; |
594 | } | |
595 | /* This is a reasonable device to use. It might | |
596 | * even be best. | |
597 | */ | |
d2eb35ac N |
598 | if (is_badblock(rdev, this_sector, sectors, |
599 | &first_bad, &bad_sectors)) { | |
600 | if (best_dist < MaxSector) | |
601 | /* already have a better device */ | |
602 | continue; | |
603 | if (first_bad <= this_sector) { | |
604 | /* cannot read here. If this is the 'primary' | |
605 | * device, then we must not read beyond | |
606 | * bad_sectors from another device.. | |
607 | */ | |
608 | bad_sectors -= (this_sector - first_bad); | |
609 | if (choose_first && sectors > bad_sectors) | |
610 | sectors = bad_sectors; | |
611 | if (best_good_sectors > sectors) | |
612 | best_good_sectors = sectors; | |
613 | ||
614 | } else { | |
615 | sector_t good_sectors = first_bad - this_sector; | |
616 | if (good_sectors > best_good_sectors) { | |
617 | best_good_sectors = good_sectors; | |
618 | best_disk = disk; | |
619 | } | |
620 | if (choose_first) | |
621 | break; | |
622 | } | |
623 | continue; | |
d82dd0e3 TM |
624 | } else { |
625 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
626 | best_disk = -1; | |
d2eb35ac | 627 | best_good_sectors = sectors; |
d82dd0e3 | 628 | } |
d2eb35ac | 629 | |
2e52d449 N |
630 | if (best_disk >= 0) |
631 | /* At least two disks to choose from so failfast is OK */ | |
632 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
633 | ||
12cee5a8 SL |
634 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
635 | has_nonrot_disk |= nonrot; | |
9dedf603 | 636 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 637 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 638 | if (choose_first) { |
76073054 | 639 | best_disk = disk; |
1da177e4 LT |
640 | break; |
641 | } | |
12cee5a8 SL |
642 | /* Don't change to another disk for sequential reads */ |
643 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
644 | || dist == 0) { | |
645 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
646 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
647 | ||
648 | best_disk = disk; | |
649 | /* | |
650 | * If buffered sequential IO size exceeds optimal | |
651 | * iosize, check if there is idle disk. If yes, choose | |
652 | * the idle disk. read_balance could already choose an | |
653 | * idle disk before noticing it's a sequential IO in | |
654 | * this disk. This doesn't matter because this disk | |
655 | * will idle, next time it will be utilized after the | |
656 | * first disk has IO size exceeds optimal iosize. In | |
657 | * this way, iosize of the first disk will be optimal | |
658 | * iosize at least. iosize of the second disk might be | |
659 | * small, but not a big deal since when the second disk | |
660 | * starts IO, the first disk is likely still busy. | |
661 | */ | |
662 | if (nonrot && opt_iosize > 0 && | |
663 | mirror->seq_start != MaxSector && | |
664 | mirror->next_seq_sect > opt_iosize && | |
665 | mirror->next_seq_sect - opt_iosize >= | |
666 | mirror->seq_start) { | |
667 | choose_next_idle = 1; | |
668 | continue; | |
669 | } | |
670 | break; | |
671 | } | |
12cee5a8 SL |
672 | |
673 | if (choose_next_idle) | |
674 | continue; | |
9dedf603 SL |
675 | |
676 | if (min_pending > pending) { | |
677 | min_pending = pending; | |
678 | best_pending_disk = disk; | |
679 | } | |
680 | ||
76073054 N |
681 | if (dist < best_dist) { |
682 | best_dist = dist; | |
9dedf603 | 683 | best_dist_disk = disk; |
1da177e4 | 684 | } |
f3ac8bf7 | 685 | } |
1da177e4 | 686 | |
9dedf603 SL |
687 | /* |
688 | * If all disks are rotational, choose the closest disk. If any disk is | |
689 | * non-rotational, choose the disk with less pending request even the | |
690 | * disk is rotational, which might/might not be optimal for raids with | |
691 | * mixed ratation/non-rotational disks depending on workload. | |
692 | */ | |
693 | if (best_disk == -1) { | |
2e52d449 | 694 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
695 | best_disk = best_pending_disk; |
696 | else | |
697 | best_disk = best_dist_disk; | |
698 | } | |
699 | ||
76073054 N |
700 | if (best_disk >= 0) { |
701 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
702 | if (!rdev) |
703 | goto retry; | |
704 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 705 | sectors = best_good_sectors; |
12cee5a8 SL |
706 | |
707 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
708 | conf->mirrors[best_disk].seq_start = this_sector; | |
709 | ||
be4d3280 | 710 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
711 | } |
712 | rcu_read_unlock(); | |
d2eb35ac | 713 | *max_sectors = sectors; |
1da177e4 | 714 | |
76073054 | 715 | return best_disk; |
1da177e4 LT |
716 | } |
717 | ||
5c675f83 | 718 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 719 | { |
e8096360 | 720 | struct r1conf *conf = mddev->private; |
0d129228 N |
721 | int i, ret = 0; |
722 | ||
4452226e | 723 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
724 | conf->pending_count >= max_queued_requests) |
725 | return 1; | |
726 | ||
0d129228 | 727 | rcu_read_lock(); |
f53e29fc | 728 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 729 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 730 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 731 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 732 | |
1ed7242e JB |
733 | BUG_ON(!q); |
734 | ||
0d129228 N |
735 | /* Note the '|| 1' - when read_balance prefers |
736 | * non-congested targets, it can be removed | |
737 | */ | |
4452226e | 738 | if ((bits & (1 << WB_async_congested)) || 1) |
dc3b17cc | 739 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 | 740 | else |
dc3b17cc | 741 | ret &= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
742 | } |
743 | } | |
744 | rcu_read_unlock(); | |
745 | return ret; | |
746 | } | |
0d129228 | 747 | |
673ca68d N |
748 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
749 | { | |
750 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
e64e4018 | 751 | md_bitmap_unplug(conf->mddev->bitmap); |
673ca68d N |
752 | wake_up(&conf->wait_barrier); |
753 | ||
754 | while (bio) { /* submit pending writes */ | |
755 | struct bio *next = bio->bi_next; | |
74d46992 | 756 | struct md_rdev *rdev = (void *)bio->bi_disk; |
673ca68d | 757 | bio->bi_next = NULL; |
74d46992 | 758 | bio_set_dev(bio, rdev->bdev); |
673ca68d | 759 | if (test_bit(Faulty, &rdev->flags)) { |
6308d8e3 | 760 | bio_io_error(bio); |
673ca68d | 761 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
74d46992 | 762 | !blk_queue_discard(bio->bi_disk->queue))) |
673ca68d N |
763 | /* Just ignore it */ |
764 | bio_endio(bio); | |
765 | else | |
766 | generic_make_request(bio); | |
767 | bio = next; | |
768 | } | |
769 | } | |
770 | ||
e8096360 | 771 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
772 | { |
773 | /* Any writes that have been queued but are awaiting | |
774 | * bitmap updates get flushed here. | |
a35e63ef | 775 | */ |
a35e63ef N |
776 | spin_lock_irq(&conf->device_lock); |
777 | ||
778 | if (conf->pending_bio_list.head) { | |
18022a1b | 779 | struct blk_plug plug; |
a35e63ef | 780 | struct bio *bio; |
18022a1b | 781 | |
a35e63ef | 782 | bio = bio_list_get(&conf->pending_bio_list); |
34db0cd6 | 783 | conf->pending_count = 0; |
a35e63ef | 784 | spin_unlock_irq(&conf->device_lock); |
474beb57 N |
785 | |
786 | /* | |
787 | * As this is called in a wait_event() loop (see freeze_array), | |
788 | * current->state might be TASK_UNINTERRUPTIBLE which will | |
789 | * cause a warning when we prepare to wait again. As it is | |
790 | * rare that this path is taken, it is perfectly safe to force | |
791 | * us to go around the wait_event() loop again, so the warning | |
792 | * is a false-positive. Silence the warning by resetting | |
793 | * thread state | |
794 | */ | |
795 | __set_current_state(TASK_RUNNING); | |
18022a1b | 796 | blk_start_plug(&plug); |
673ca68d | 797 | flush_bio_list(conf, bio); |
18022a1b | 798 | blk_finish_plug(&plug); |
a35e63ef N |
799 | } else |
800 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
801 | } |
802 | ||
17999be4 N |
803 | /* Barriers.... |
804 | * Sometimes we need to suspend IO while we do something else, | |
805 | * either some resync/recovery, or reconfigure the array. | |
806 | * To do this we raise a 'barrier'. | |
807 | * The 'barrier' is a counter that can be raised multiple times | |
808 | * to count how many activities are happening which preclude | |
809 | * normal IO. | |
810 | * We can only raise the barrier if there is no pending IO. | |
811 | * i.e. if nr_pending == 0. | |
812 | * We choose only to raise the barrier if no-one is waiting for the | |
813 | * barrier to go down. This means that as soon as an IO request | |
814 | * is ready, no other operations which require a barrier will start | |
815 | * until the IO request has had a chance. | |
816 | * | |
817 | * So: regular IO calls 'wait_barrier'. When that returns there | |
818 | * is no backgroup IO happening, It must arrange to call | |
819 | * allow_barrier when it has finished its IO. | |
820 | * backgroup IO calls must call raise_barrier. Once that returns | |
821 | * there is no normal IO happeing. It must arrange to call | |
822 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 823 | */ |
8c242593 | 824 | static sector_t raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 825 | { |
fd76863e | 826 | int idx = sector_to_idx(sector_nr); |
827 | ||
1da177e4 | 828 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
829 | |
830 | /* Wait until no block IO is waiting */ | |
824e47da | 831 | wait_event_lock_irq(conf->wait_barrier, |
832 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 833 | conf->resync_lock); |
17999be4 N |
834 | |
835 | /* block any new IO from starting */ | |
824e47da | 836 | atomic_inc(&conf->barrier[idx]); |
837 | /* | |
838 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
839 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
840 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
841 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
842 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
843 | * there will be a race between raise_barrier() and _wait_barrier(). | |
844 | */ | |
845 | smp_mb__after_atomic(); | |
17999be4 | 846 | |
79ef3a8a | 847 | /* For these conditions we must wait: |
848 | * A: while the array is in frozen state | |
fd76863e | 849 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
850 | * existing in corresponding I/O barrier bucket. | |
851 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
852 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 853 | */ |
17999be4 | 854 | wait_event_lock_irq(conf->wait_barrier, |
8c242593 | 855 | (!conf->array_frozen && |
824e47da | 856 | !atomic_read(&conf->nr_pending[idx]) && |
8c242593 YY |
857 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || |
858 | test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), | |
eed8c02e | 859 | conf->resync_lock); |
17999be4 | 860 | |
8c242593 YY |
861 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
862 | atomic_dec(&conf->barrier[idx]); | |
863 | spin_unlock_irq(&conf->resync_lock); | |
864 | wake_up(&conf->wait_barrier); | |
865 | return -EINTR; | |
866 | } | |
867 | ||
43ac9b84 | 868 | atomic_inc(&conf->nr_sync_pending); |
17999be4 | 869 | spin_unlock_irq(&conf->resync_lock); |
8c242593 YY |
870 | |
871 | return 0; | |
17999be4 N |
872 | } |
873 | ||
fd76863e | 874 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 875 | { |
fd76863e | 876 | int idx = sector_to_idx(sector_nr); |
877 | ||
824e47da | 878 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 879 | |
824e47da | 880 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 881 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
882 | wake_up(&conf->wait_barrier); |
883 | } | |
884 | ||
fd76863e | 885 | static void _wait_barrier(struct r1conf *conf, int idx) |
17999be4 | 886 | { |
824e47da | 887 | /* |
888 | * We need to increase conf->nr_pending[idx] very early here, | |
889 | * then raise_barrier() can be blocked when it waits for | |
890 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
891 | * conf->resync_lock when there is no barrier raised in same | |
892 | * barrier unit bucket. Also if the array is frozen, I/O | |
893 | * should be blocked until array is unfrozen. | |
894 | */ | |
895 | atomic_inc(&conf->nr_pending[idx]); | |
896 | /* | |
897 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
898 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
899 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
900 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
901 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
902 | * will be a race between _wait_barrier() and raise_barrier(). | |
903 | */ | |
904 | smp_mb__after_atomic(); | |
79ef3a8a | 905 | |
824e47da | 906 | /* |
907 | * Don't worry about checking two atomic_t variables at same time | |
908 | * here. If during we check conf->barrier[idx], the array is | |
909 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
910 | * 0, it is safe to return and make the I/O continue. Because the | |
911 | * array is frozen, all I/O returned here will eventually complete | |
912 | * or be queued, no race will happen. See code comment in | |
913 | * frozen_array(). | |
914 | */ | |
915 | if (!READ_ONCE(conf->array_frozen) && | |
916 | !atomic_read(&conf->barrier[idx])) | |
917 | return; | |
79ef3a8a | 918 | |
824e47da | 919 | /* |
920 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
921 | * should be decreased before waiting for barrier to drop. | |
922 | * Otherwise, we may encounter a race condition because | |
923 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
924 | * to be 0 at same time. | |
925 | */ | |
926 | spin_lock_irq(&conf->resync_lock); | |
927 | atomic_inc(&conf->nr_waiting[idx]); | |
928 | atomic_dec(&conf->nr_pending[idx]); | |
929 | /* | |
930 | * In case freeze_array() is waiting for | |
931 | * get_unqueued_pending() == extra | |
932 | */ | |
933 | wake_up(&conf->wait_barrier); | |
934 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
935 | wait_event_lock_irq(conf->wait_barrier, | |
936 | !conf->array_frozen && | |
937 | !atomic_read(&conf->barrier[idx]), | |
938 | conf->resync_lock); | |
939 | atomic_inc(&conf->nr_pending[idx]); | |
940 | atomic_dec(&conf->nr_waiting[idx]); | |
fd76863e | 941 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 942 | } |
943 | ||
fd76863e | 944 | static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) |
79ef3a8a | 945 | { |
fd76863e | 946 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 947 | |
824e47da | 948 | /* |
949 | * Very similar to _wait_barrier(). The difference is, for read | |
950 | * I/O we don't need wait for sync I/O, but if the whole array | |
951 | * is frozen, the read I/O still has to wait until the array is | |
952 | * unfrozen. Since there is no ordering requirement with | |
953 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
954 | */ | |
955 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 956 | |
824e47da | 957 | if (!READ_ONCE(conf->array_frozen)) |
958 | return; | |
959 | ||
960 | spin_lock_irq(&conf->resync_lock); | |
961 | atomic_inc(&conf->nr_waiting[idx]); | |
962 | atomic_dec(&conf->nr_pending[idx]); | |
963 | /* | |
964 | * In case freeze_array() is waiting for | |
965 | * get_unqueued_pending() == extra | |
966 | */ | |
967 | wake_up(&conf->wait_barrier); | |
968 | /* Wait for array to be unfrozen */ | |
969 | wait_event_lock_irq(conf->wait_barrier, | |
970 | !conf->array_frozen, | |
971 | conf->resync_lock); | |
972 | atomic_inc(&conf->nr_pending[idx]); | |
973 | atomic_dec(&conf->nr_waiting[idx]); | |
1da177e4 LT |
974 | spin_unlock_irq(&conf->resync_lock); |
975 | } | |
976 | ||
fd76863e | 977 | static void wait_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 978 | { |
fd76863e | 979 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 980 | |
fd76863e | 981 | _wait_barrier(conf, idx); |
982 | } | |
983 | ||
fd76863e | 984 | static void _allow_barrier(struct r1conf *conf, int idx) |
17999be4 | 985 | { |
824e47da | 986 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
987 | wake_up(&conf->wait_barrier); |
988 | } | |
989 | ||
fd76863e | 990 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
991 | { | |
992 | int idx = sector_to_idx(sector_nr); | |
993 | ||
994 | _allow_barrier(conf, idx); | |
995 | } | |
996 | ||
fd76863e | 997 | /* conf->resync_lock should be held */ |
998 | static int get_unqueued_pending(struct r1conf *conf) | |
999 | { | |
1000 | int idx, ret; | |
1001 | ||
43ac9b84 XN |
1002 | ret = atomic_read(&conf->nr_sync_pending); |
1003 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1004 | ret += atomic_read(&conf->nr_pending[idx]) - |
1005 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1006 | |
1007 | return ret; | |
1008 | } | |
1009 | ||
e2d59925 | 1010 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1011 | { |
fd76863e | 1012 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1013 | * go quiet. |
fd76863e | 1014 | * This is called in two situations: |
1015 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1016 | * 2) one normal I/O request failed. | |
1017 | ||
1018 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1019 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1020 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1021 | * queued. When everything goes quite, there are only queued I/Os left. | |
1022 | ||
1023 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1024 | * barrier bucket index which this I/O request hits. When all sync and | |
1025 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1026 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1027 | * in handle_read_error(), we may call freeze_array() before trying to | |
1028 | * fix the read error. In this case, the error read I/O is not queued, | |
1029 | * so get_unqueued_pending() == 1. | |
1030 | * | |
1031 | * Therefore before this function returns, we need to wait until | |
1032 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1033 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1034 | */ |
1035 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1036 | conf->array_frozen = 1; |
578b54ad | 1037 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1038 | wait_event_lock_irq_cmd( |
1039 | conf->wait_barrier, | |
1040 | get_unqueued_pending(conf) == extra, | |
1041 | conf->resync_lock, | |
1042 | flush_pending_writes(conf)); | |
ddaf22ab N |
1043 | spin_unlock_irq(&conf->resync_lock); |
1044 | } | |
e8096360 | 1045 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1046 | { |
1047 | /* reverse the effect of the freeze */ | |
1048 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1049 | conf->array_frozen = 0; |
ddaf22ab | 1050 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1051 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1052 | } |
1053 | ||
16d56e2f | 1054 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1055 | struct bio *bio) |
4b6d287f | 1056 | { |
cb83efcf | 1057 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1058 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1059 | int i = 0; | |
1060 | struct bio *behind_bio = NULL; | |
1061 | ||
1062 | behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); | |
1063 | if (!behind_bio) | |
16d56e2f | 1064 | return; |
4b6d287f | 1065 | |
41743c1f | 1066 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1067 | if (!bio_has_data(bio)) { |
1068 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1069 | goto skip_copy; |
16d56e2f | 1070 | } |
41743c1f | 1071 | |
dba40d46 MD |
1072 | behind_bio->bi_write_hint = bio->bi_write_hint; |
1073 | ||
841c1316 ML |
1074 | while (i < vcnt && size) { |
1075 | struct page *page; | |
1076 | int len = min_t(int, PAGE_SIZE, size); | |
1077 | ||
1078 | page = alloc_page(GFP_NOIO); | |
1079 | if (unlikely(!page)) | |
1080 | goto free_pages; | |
1081 | ||
1082 | bio_add_page(behind_bio, page, len, 0); | |
1083 | ||
1084 | size -= len; | |
1085 | i++; | |
4b6d287f | 1086 | } |
841c1316 | 1087 | |
cb83efcf | 1088 | bio_copy_data(behind_bio, bio); |
41743c1f | 1089 | skip_copy: |
56a64c17 | 1090 | r1_bio->behind_master_bio = behind_bio; |
af6d7b76 | 1091 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1092 | |
16d56e2f | 1093 | return; |
841c1316 ML |
1094 | |
1095 | free_pages: | |
4f024f37 KO |
1096 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1097 | bio->bi_iter.bi_size); | |
841c1316 | 1098 | bio_free_pages(behind_bio); |
16d56e2f | 1099 | bio_put(behind_bio); |
4b6d287f N |
1100 | } |
1101 | ||
f54a9d0e N |
1102 | struct raid1_plug_cb { |
1103 | struct blk_plug_cb cb; | |
1104 | struct bio_list pending; | |
1105 | int pending_cnt; | |
1106 | }; | |
1107 | ||
1108 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1109 | { | |
1110 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1111 | cb); | |
1112 | struct mddev *mddev = plug->cb.data; | |
1113 | struct r1conf *conf = mddev->private; | |
1114 | struct bio *bio; | |
1115 | ||
874807a8 | 1116 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1117 | spin_lock_irq(&conf->device_lock); |
1118 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1119 | conf->pending_count += plug->pending_cnt; | |
1120 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1121 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1122 | md_wakeup_thread(mddev->thread); |
1123 | kfree(plug); | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1128 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1129 | flush_bio_list(conf, bio); |
f54a9d0e N |
1130 | kfree(plug); |
1131 | } | |
1132 | ||
689389a0 N |
1133 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1134 | { | |
1135 | r1_bio->master_bio = bio; | |
1136 | r1_bio->sectors = bio_sectors(bio); | |
1137 | r1_bio->state = 0; | |
1138 | r1_bio->mddev = mddev; | |
1139 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1140 | } | |
1141 | ||
fd76863e | 1142 | static inline struct r1bio * |
689389a0 | 1143 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1144 | { |
1145 | struct r1conf *conf = mddev->private; | |
1146 | struct r1bio *r1_bio; | |
1147 | ||
afeee514 | 1148 | r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); |
689389a0 N |
1149 | /* Ensure no bio records IO_BLOCKED */ |
1150 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1151 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1152 | return r1_bio; |
1153 | } | |
1154 | ||
c230e7e5 | 1155 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1156 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1157 | { |
e8096360 | 1158 | struct r1conf *conf = mddev->private; |
0eaf822c | 1159 | struct raid1_info *mirror; |
1da177e4 | 1160 | struct bio *read_bio; |
3b046a97 RL |
1161 | struct bitmap *bitmap = mddev->bitmap; |
1162 | const int op = bio_op(bio); | |
1163 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
3b046a97 RL |
1164 | int max_sectors; |
1165 | int rdisk; | |
689389a0 N |
1166 | bool print_msg = !!r1_bio; |
1167 | char b[BDEVNAME_SIZE]; | |
3b046a97 | 1168 | |
fd76863e | 1169 | /* |
689389a0 N |
1170 | * If r1_bio is set, we are blocking the raid1d thread |
1171 | * so there is a tiny risk of deadlock. So ask for | |
1172 | * emergency memory if needed. | |
fd76863e | 1173 | */ |
689389a0 | 1174 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1175 | |
689389a0 N |
1176 | if (print_msg) { |
1177 | /* Need to get the block device name carefully */ | |
1178 | struct md_rdev *rdev; | |
1179 | rcu_read_lock(); | |
1180 | rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); | |
1181 | if (rdev) | |
1182 | bdevname(rdev->bdev, b); | |
1183 | else | |
1184 | strcpy(b, "???"); | |
1185 | rcu_read_unlock(); | |
1186 | } | |
3b046a97 | 1187 | |
fd76863e | 1188 | /* |
fd76863e | 1189 | * Still need barrier for READ in case that whole |
1190 | * array is frozen. | |
fd76863e | 1191 | */ |
fd76863e | 1192 | wait_read_barrier(conf, bio->bi_iter.bi_sector); |
1193 | ||
689389a0 N |
1194 | if (!r1_bio) |
1195 | r1_bio = alloc_r1bio(mddev, bio); | |
1196 | else | |
1197 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1198 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1199 | |
1200 | /* | |
1201 | * make_request() can abort the operation when read-ahead is being | |
1202 | * used and no empty request is available. | |
1203 | */ | |
3b046a97 RL |
1204 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1205 | ||
1206 | if (rdisk < 0) { | |
1207 | /* couldn't find anywhere to read from */ | |
689389a0 N |
1208 | if (print_msg) { |
1209 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", | |
1210 | mdname(mddev), | |
1211 | b, | |
1212 | (unsigned long long)r1_bio->sector); | |
1213 | } | |
3b046a97 RL |
1214 | raid_end_bio_io(r1_bio); |
1215 | return; | |
1216 | } | |
1217 | mirror = conf->mirrors + rdisk; | |
1218 | ||
689389a0 N |
1219 | if (print_msg) |
1220 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", | |
1221 | mdname(mddev), | |
1222 | (unsigned long long)r1_bio->sector, | |
1223 | bdevname(mirror->rdev->bdev, b)); | |
1224 | ||
3b046a97 RL |
1225 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1226 | bitmap) { | |
1227 | /* | |
1228 | * Reading from a write-mostly device must take care not to | |
1229 | * over-take any writes that are 'behind' | |
1230 | */ | |
1231 | raid1_log(mddev, "wait behind writes"); | |
1232 | wait_event(bitmap->behind_wait, | |
1233 | atomic_read(&bitmap->behind_writes) == 0); | |
1234 | } | |
c230e7e5 N |
1235 | |
1236 | if (max_sectors < bio_sectors(bio)) { | |
1237 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1238 | gfp, &conf->bio_split); |
c230e7e5 N |
1239 | bio_chain(split, bio); |
1240 | generic_make_request(bio); | |
1241 | bio = split; | |
1242 | r1_bio->master_bio = bio; | |
1243 | r1_bio->sectors = max_sectors; | |
1244 | } | |
1245 | ||
3b046a97 | 1246 | r1_bio->read_disk = rdisk; |
3b046a97 | 1247 | |
afeee514 | 1248 | read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); |
3b046a97 RL |
1249 | |
1250 | r1_bio->bios[rdisk] = read_bio; | |
1251 | ||
1252 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1253 | mirror->rdev->data_offset; | |
74d46992 | 1254 | bio_set_dev(read_bio, mirror->rdev->bdev); |
3b046a97 RL |
1255 | read_bio->bi_end_io = raid1_end_read_request; |
1256 | bio_set_op_attrs(read_bio, op, do_sync); | |
1257 | if (test_bit(FailFast, &mirror->rdev->flags) && | |
1258 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1259 | read_bio->bi_opf |= MD_FAILFAST; | |
1260 | read_bio->bi_private = r1_bio; | |
1261 | ||
1262 | if (mddev->gendisk) | |
74d46992 CH |
1263 | trace_block_bio_remap(read_bio->bi_disk->queue, read_bio, |
1264 | disk_devt(mddev->gendisk), r1_bio->sector); | |
3b046a97 | 1265 | |
c230e7e5 | 1266 | generic_make_request(read_bio); |
3b046a97 RL |
1267 | } |
1268 | ||
c230e7e5 N |
1269 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1270 | int max_write_sectors) | |
3b046a97 RL |
1271 | { |
1272 | struct r1conf *conf = mddev->private; | |
fd76863e | 1273 | struct r1bio *r1_bio; |
1f68f0c4 | 1274 | int i, disks; |
3b046a97 | 1275 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1276 | unsigned long flags; |
3cb03002 | 1277 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1278 | struct blk_plug_cb *cb; |
1279 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 | 1280 | int first_clone; |
1f68f0c4 | 1281 | int max_sectors; |
191ea9b2 | 1282 | |
b3143b9a | 1283 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1284 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1285 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 | 1286 | |
6eef4b21 N |
1287 | DEFINE_WAIT(w); |
1288 | for (;;) { | |
6eef4b21 | 1289 | prepare_to_wait(&conf->wait_barrier, |
ae89fd3d | 1290 | &w, TASK_IDLE); |
f81f7302 | 1291 | if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
385f4d7f | 1292 | bio->bi_iter.bi_sector, |
b3143b9a | 1293 | bio_end_sector(bio))) |
6eef4b21 N |
1294 | break; |
1295 | schedule(); | |
1296 | } | |
1297 | finish_wait(&conf->wait_barrier, &w); | |
1298 | } | |
f81f7302 GJ |
1299 | |
1300 | /* | |
1301 | * Register the new request and wait if the reconstruction | |
1302 | * thread has put up a bar for new requests. | |
1303 | * Continue immediately if no resync is active currently. | |
1304 | */ | |
fd76863e | 1305 | wait_barrier(conf, bio->bi_iter.bi_sector); |
1306 | ||
689389a0 | 1307 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1308 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1309 | |
34db0cd6 N |
1310 | if (conf->pending_count >= max_queued_requests) { |
1311 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1312 | raid1_log(mddev, "wait queued"); |
34db0cd6 N |
1313 | wait_event(conf->wait_barrier, |
1314 | conf->pending_count < max_queued_requests); | |
1315 | } | |
1f68f0c4 | 1316 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1317 | * inc refcount on their rdev. Record them by setting |
1318 | * bios[x] to bio | |
1f68f0c4 N |
1319 | * If there are known/acknowledged bad blocks on any device on |
1320 | * which we have seen a write error, we want to avoid writing those | |
1321 | * blocks. | |
1322 | * This potentially requires several writes to write around | |
1323 | * the bad blocks. Each set of writes gets it's own r1bio | |
1324 | * with a set of bios attached. | |
1da177e4 | 1325 | */ |
c3b328ac | 1326 | |
8f19ccb2 | 1327 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1328 | retry_write: |
1329 | blocked_rdev = NULL; | |
1da177e4 | 1330 | rcu_read_lock(); |
1f68f0c4 | 1331 | max_sectors = r1_bio->sectors; |
1da177e4 | 1332 | for (i = 0; i < disks; i++) { |
3cb03002 | 1333 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1334 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1335 | atomic_inc(&rdev->nr_pending); | |
1336 | blocked_rdev = rdev; | |
1337 | break; | |
1338 | } | |
1f68f0c4 | 1339 | r1_bio->bios[i] = NULL; |
8ae12666 | 1340 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1341 | if (i < conf->raid_disks) |
1342 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1343 | continue; |
1344 | } | |
1345 | ||
1346 | atomic_inc(&rdev->nr_pending); | |
1347 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1348 | sector_t first_bad; | |
1349 | int bad_sectors; | |
1350 | int is_bad; | |
1351 | ||
3b046a97 | 1352 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1353 | &first_bad, &bad_sectors); |
1354 | if (is_bad < 0) { | |
1355 | /* mustn't write here until the bad block is | |
1356 | * acknowledged*/ | |
1357 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1358 | blocked_rdev = rdev; | |
1359 | break; | |
1360 | } | |
1361 | if (is_bad && first_bad <= r1_bio->sector) { | |
1362 | /* Cannot write here at all */ | |
1363 | bad_sectors -= (r1_bio->sector - first_bad); | |
1364 | if (bad_sectors < max_sectors) | |
1365 | /* mustn't write more than bad_sectors | |
1366 | * to other devices yet | |
1367 | */ | |
1368 | max_sectors = bad_sectors; | |
03c902e1 | 1369 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1370 | /* We don't set R1BIO_Degraded as that |
1371 | * only applies if the disk is | |
1372 | * missing, so it might be re-added, | |
1373 | * and we want to know to recover this | |
1374 | * chunk. | |
1375 | * In this case the device is here, | |
1376 | * and the fact that this chunk is not | |
1377 | * in-sync is recorded in the bad | |
1378 | * block log | |
1379 | */ | |
1380 | continue; | |
964147d5 | 1381 | } |
1f68f0c4 N |
1382 | if (is_bad) { |
1383 | int good_sectors = first_bad - r1_bio->sector; | |
1384 | if (good_sectors < max_sectors) | |
1385 | max_sectors = good_sectors; | |
1386 | } | |
1387 | } | |
1388 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1389 | } |
1390 | rcu_read_unlock(); | |
1391 | ||
6bfe0b49 DW |
1392 | if (unlikely(blocked_rdev)) { |
1393 | /* Wait for this device to become unblocked */ | |
1394 | int j; | |
1395 | ||
1396 | for (j = 0; j < i; j++) | |
1397 | if (r1_bio->bios[j]) | |
1398 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1399 | r1_bio->state = 0; |
fd76863e | 1400 | allow_barrier(conf, bio->bi_iter.bi_sector); |
578b54ad | 1401 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1402 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
fd76863e | 1403 | wait_barrier(conf, bio->bi_iter.bi_sector); |
6bfe0b49 DW |
1404 | goto retry_write; |
1405 | } | |
1406 | ||
c230e7e5 N |
1407 | if (max_sectors < bio_sectors(bio)) { |
1408 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1409 | GFP_NOIO, &conf->bio_split); |
c230e7e5 N |
1410 | bio_chain(split, bio); |
1411 | generic_make_request(bio); | |
1412 | bio = split; | |
1413 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1414 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1415 | } |
4b6d287f | 1416 | |
4e78064f | 1417 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1418 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1419 | |
1f68f0c4 | 1420 | first_clone = 1; |
d8c84c4f | 1421 | |
1da177e4 | 1422 | for (i = 0; i < disks; i++) { |
8e58e327 | 1423 | struct bio *mbio = NULL; |
1da177e4 LT |
1424 | if (!r1_bio->bios[i]) |
1425 | continue; | |
1426 | ||
1f68f0c4 N |
1427 | |
1428 | if (first_clone) { | |
1429 | /* do behind I/O ? | |
1430 | * Not if there are too many, or cannot | |
1431 | * allocate memory, or a reader on WriteMostly | |
1432 | * is waiting for behind writes to flush */ | |
1433 | if (bitmap && | |
1434 | (atomic_read(&bitmap->behind_writes) | |
1435 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1436 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1437 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1438 | } |
1f68f0c4 | 1439 | |
e64e4018 AS |
1440 | md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, |
1441 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1f68f0c4 N |
1442 | first_clone = 0; |
1443 | } | |
8e58e327 | 1444 | |
16d56e2f SL |
1445 | if (r1_bio->behind_master_bio) |
1446 | mbio = bio_clone_fast(r1_bio->behind_master_bio, | |
afeee514 | 1447 | GFP_NOIO, &mddev->bio_set); |
16d56e2f | 1448 | else |
afeee514 | 1449 | mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); |
8e58e327 | 1450 | |
841c1316 | 1451 | if (r1_bio->behind_master_bio) { |
4b6d287f N |
1452 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1453 | atomic_inc(&r1_bio->behind_remaining); | |
1454 | } | |
1455 | ||
1f68f0c4 N |
1456 | r1_bio->bios[i] = mbio; |
1457 | ||
4f024f37 | 1458 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 | 1459 | conf->mirrors[i].rdev->data_offset); |
74d46992 | 1460 | bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); |
1f68f0c4 | 1461 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1462 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
212e7eb7 N |
1463 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && |
1464 | !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && | |
1465 | conf->raid_disks - mddev->degraded > 1) | |
1466 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1467 | mbio->bi_private = r1_bio; |
1468 | ||
1da177e4 | 1469 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1470 | |
109e3765 | 1471 | if (mddev->gendisk) |
74d46992 | 1472 | trace_block_bio_remap(mbio->bi_disk->queue, |
109e3765 N |
1473 | mbio, disk_devt(mddev->gendisk), |
1474 | r1_bio->sector); | |
1475 | /* flush_pending_writes() needs access to the rdev so...*/ | |
74d46992 | 1476 | mbio->bi_disk = (void *)conf->mirrors[i].rdev; |
109e3765 | 1477 | |
f54a9d0e N |
1478 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1479 | if (cb) | |
1480 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1481 | else | |
1482 | plug = NULL; | |
f54a9d0e N |
1483 | if (plug) { |
1484 | bio_list_add(&plug->pending, mbio); | |
1485 | plug->pending_cnt++; | |
1486 | } else { | |
23b245c0 | 1487 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1488 | bio_list_add(&conf->pending_bio_list, mbio); |
1489 | conf->pending_count++; | |
23b245c0 | 1490 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1491 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1492 | } |
1da177e4 | 1493 | } |
1f68f0c4 | 1494 | |
079fa166 N |
1495 | r1_bio_write_done(r1_bio); |
1496 | ||
1497 | /* In case raid1d snuck in to freeze_array */ | |
1498 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1499 | } |
1500 | ||
cc27b0c7 | 1501 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1502 | { |
fd76863e | 1503 | sector_t sectors; |
3b046a97 | 1504 | |
aff8da09 SL |
1505 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
1506 | md_flush_request(mddev, bio); | |
cc27b0c7 | 1507 | return true; |
aff8da09 | 1508 | } |
3b046a97 | 1509 | |
c230e7e5 N |
1510 | /* |
1511 | * There is a limit to the maximum size, but | |
1512 | * the read/write handler might find a lower limit | |
1513 | * due to bad blocks. To avoid multiple splits, | |
1514 | * we pass the maximum number of sectors down | |
1515 | * and let the lower level perform the split. | |
1516 | */ | |
1517 | sectors = align_to_barrier_unit_end( | |
1518 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1519 | |
c230e7e5 | 1520 | if (bio_data_dir(bio) == READ) |
689389a0 | 1521 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1522 | else { |
1523 | if (!md_write_start(mddev,bio)) | |
1524 | return false; | |
c230e7e5 | 1525 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1526 | } |
1527 | return true; | |
3b046a97 RL |
1528 | } |
1529 | ||
849674e4 | 1530 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1531 | { |
e8096360 | 1532 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1533 | int i; |
1534 | ||
1535 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1536 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1537 | rcu_read_lock(); |
1538 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1539 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1540 | seq_printf(seq, "%s", |
ddac7c7e N |
1541 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1542 | } | |
1543 | rcu_read_unlock(); | |
1da177e4 LT |
1544 | seq_printf(seq, "]"); |
1545 | } | |
1546 | ||
849674e4 | 1547 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1548 | { |
1549 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1550 | struct r1conf *conf = mddev->private; |
423f04d6 | 1551 | unsigned long flags; |
1da177e4 LT |
1552 | |
1553 | /* | |
1554 | * If it is not operational, then we have already marked it as dead | |
1555 | * else if it is the last working disks, ignore the error, let the | |
1556 | * next level up know. | |
1557 | * else mark the drive as failed | |
1558 | */ | |
2e52d449 | 1559 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1560 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1561 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1562 | /* |
1563 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1564 | * normal single drive. |
1565 | * However don't try a recovery from this drive as | |
1566 | * it is very likely to fail. | |
1da177e4 | 1567 | */ |
5389042f | 1568 | conf->recovery_disabled = mddev->recovery_disabled; |
2e52d449 | 1569 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1570 | return; |
4044ba58 | 1571 | } |
de393cde | 1572 | set_bit(Blocked, &rdev->flags); |
ebda52fa | 1573 | if (test_and_clear_bit(In_sync, &rdev->flags)) |
1da177e4 | 1574 | mddev->degraded++; |
ebda52fa | 1575 | set_bit(Faulty, &rdev->flags); |
423f04d6 | 1576 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1577 | /* |
1578 | * if recovery is running, make sure it aborts. | |
1579 | */ | |
1580 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1581 | set_mask_bits(&mddev->sb_flags, 0, |
1582 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
1d41c216 N |
1583 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1584 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1585 | mdname(mddev), bdevname(rdev->bdev, b), | |
1586 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1587 | } |
1588 | ||
e8096360 | 1589 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1590 | { |
1591 | int i; | |
1da177e4 | 1592 | |
1d41c216 | 1593 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1594 | if (!conf) { |
1d41c216 | 1595 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1596 | return; |
1597 | } | |
1d41c216 N |
1598 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1599 | conf->raid_disks); | |
1da177e4 | 1600 | |
ddac7c7e | 1601 | rcu_read_lock(); |
1da177e4 LT |
1602 | for (i = 0; i < conf->raid_disks; i++) { |
1603 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1604 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1605 | if (rdev) |
1d41c216 N |
1606 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1607 | i, !test_bit(In_sync, &rdev->flags), | |
1608 | !test_bit(Faulty, &rdev->flags), | |
1609 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1610 | } |
ddac7c7e | 1611 | rcu_read_unlock(); |
1da177e4 LT |
1612 | } |
1613 | ||
e8096360 | 1614 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1615 | { |
f6eca2d4 ND |
1616 | int idx; |
1617 | ||
1618 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { | |
1619 | _wait_barrier(conf, idx); | |
1620 | _allow_barrier(conf, idx); | |
1621 | } | |
1da177e4 | 1622 | |
afeee514 | 1623 | mempool_exit(&conf->r1buf_pool); |
1da177e4 LT |
1624 | } |
1625 | ||
fd01b88c | 1626 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1627 | { |
1628 | int i; | |
e8096360 | 1629 | struct r1conf *conf = mddev->private; |
6b965620 N |
1630 | int count = 0; |
1631 | unsigned long flags; | |
1da177e4 LT |
1632 | |
1633 | /* | |
f72ffdd6 | 1634 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1635 | * and mark them readable. |
1636 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1637 | * device_lock used to avoid races with raid1_end_read_request |
1638 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1639 | */ |
423f04d6 | 1640 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1641 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1642 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1643 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1644 | if (repl | |
1aee41f6 | 1645 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1646 | && repl->recovery_offset == MaxSector |
1647 | && !test_bit(Faulty, &repl->flags) | |
1648 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1649 | /* replacement has just become active */ | |
1650 | if (!rdev || | |
1651 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1652 | count++; | |
1653 | if (rdev) { | |
1654 | /* Replaced device not technically | |
1655 | * faulty, but we need to be sure | |
1656 | * it gets removed and never re-added | |
1657 | */ | |
1658 | set_bit(Faulty, &rdev->flags); | |
1659 | sysfs_notify_dirent_safe( | |
1660 | rdev->sysfs_state); | |
1661 | } | |
1662 | } | |
ddac7c7e | 1663 | if (rdev |
61e4947c | 1664 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1665 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1666 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1667 | count++; |
654e8b5a | 1668 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1669 | } |
1670 | } | |
6b965620 N |
1671 | mddev->degraded -= count; |
1672 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1673 | |
1674 | print_conf(conf); | |
6b965620 | 1675 | return count; |
1da177e4 LT |
1676 | } |
1677 | ||
fd01b88c | 1678 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1679 | { |
e8096360 | 1680 | struct r1conf *conf = mddev->private; |
199050ea | 1681 | int err = -EEXIST; |
41158c7e | 1682 | int mirror = 0; |
0eaf822c | 1683 | struct raid1_info *p; |
6c2fce2e | 1684 | int first = 0; |
30194636 | 1685 | int last = conf->raid_disks - 1; |
1da177e4 | 1686 | |
5389042f N |
1687 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1688 | return -EBUSY; | |
1689 | ||
1501efad DW |
1690 | if (md_integrity_add_rdev(rdev, mddev)) |
1691 | return -ENXIO; | |
1692 | ||
6c2fce2e NB |
1693 | if (rdev->raid_disk >= 0) |
1694 | first = last = rdev->raid_disk; | |
1695 | ||
70bcecdb GR |
1696 | /* |
1697 | * find the disk ... but prefer rdev->saved_raid_disk | |
1698 | * if possible. | |
1699 | */ | |
1700 | if (rdev->saved_raid_disk >= 0 && | |
1701 | rdev->saved_raid_disk >= first && | |
9e753ba9 | 1702 | rdev->saved_raid_disk < conf->raid_disks && |
70bcecdb GR |
1703 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1704 | first = last = rdev->saved_raid_disk; | |
1705 | ||
7ef449d1 N |
1706 | for (mirror = first; mirror <= last; mirror++) { |
1707 | p = conf->mirrors+mirror; | |
1708 | if (!p->rdev) { | |
1da177e4 | 1709 | |
9092c02d JB |
1710 | if (mddev->gendisk) |
1711 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1712 | rdev->data_offset << 9); | |
1da177e4 LT |
1713 | |
1714 | p->head_position = 0; | |
1715 | rdev->raid_disk = mirror; | |
199050ea | 1716 | err = 0; |
6aea114a N |
1717 | /* As all devices are equivalent, we don't need a full recovery |
1718 | * if this was recently any drive of the array | |
1719 | */ | |
1720 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1721 | conf->fullsync = 1; |
d6065f7b | 1722 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1723 | break; |
1724 | } | |
7ef449d1 N |
1725 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1726 | p[conf->raid_disks].rdev == NULL) { | |
1727 | /* Add this device as a replacement */ | |
1728 | clear_bit(In_sync, &rdev->flags); | |
1729 | set_bit(Replacement, &rdev->flags); | |
1730 | rdev->raid_disk = mirror; | |
1731 | err = 0; | |
1732 | conf->fullsync = 1; | |
1733 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1734 | break; | |
1735 | } | |
1736 | } | |
9092c02d | 1737 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
8b904b5b | 1738 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1739 | print_conf(conf); |
199050ea | 1740 | return err; |
1da177e4 LT |
1741 | } |
1742 | ||
b8321b68 | 1743 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1744 | { |
e8096360 | 1745 | struct r1conf *conf = mddev->private; |
1da177e4 | 1746 | int err = 0; |
b8321b68 | 1747 | int number = rdev->raid_disk; |
0eaf822c | 1748 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1749 | |
b014f14c N |
1750 | if (rdev != p->rdev) |
1751 | p = conf->mirrors + conf->raid_disks + number; | |
1752 | ||
1da177e4 | 1753 | print_conf(conf); |
b8321b68 | 1754 | if (rdev == p->rdev) { |
b2d444d7 | 1755 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1756 | atomic_read(&rdev->nr_pending)) { |
1757 | err = -EBUSY; | |
1758 | goto abort; | |
1759 | } | |
046abeed | 1760 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1761 | * is not possible. |
1762 | */ | |
1763 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1764 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1765 | mddev->degraded < conf->raid_disks) { |
1766 | err = -EBUSY; | |
1767 | goto abort; | |
1768 | } | |
1da177e4 | 1769 | p->rdev = NULL; |
d787be40 N |
1770 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1771 | synchronize_rcu(); | |
1772 | if (atomic_read(&rdev->nr_pending)) { | |
1773 | /* lost the race, try later */ | |
1774 | err = -EBUSY; | |
1775 | p->rdev = rdev; | |
1776 | goto abort; | |
1777 | } | |
1778 | } | |
1779 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1780 | /* We just removed a device that is being replaced. |
1781 | * Move down the replacement. We drain all IO before | |
1782 | * doing this to avoid confusion. | |
1783 | */ | |
1784 | struct md_rdev *repl = | |
1785 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1786 | freeze_array(conf, 0); |
3de59bb9 YY |
1787 | if (atomic_read(&repl->nr_pending)) { |
1788 | /* It means that some queued IO of retry_list | |
1789 | * hold repl. Thus, we cannot set replacement | |
1790 | * as NULL, avoiding rdev NULL pointer | |
1791 | * dereference in sync_request_write and | |
1792 | * handle_write_finished. | |
1793 | */ | |
1794 | err = -EBUSY; | |
1795 | unfreeze_array(conf); | |
1796 | goto abort; | |
1797 | } | |
8c7a2c2b N |
1798 | clear_bit(Replacement, &repl->flags); |
1799 | p->rdev = repl; | |
1800 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1801 | unfreeze_array(conf); |
e5bc9c3c GJ |
1802 | } |
1803 | ||
1804 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1805 | err = md_integrity_register(mddev); |
1da177e4 LT |
1806 | } |
1807 | abort: | |
1808 | ||
1809 | print_conf(conf); | |
1810 | return err; | |
1811 | } | |
1812 | ||
4246a0b6 | 1813 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1814 | { |
98d30c58 | 1815 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1816 | |
0fc280f6 | 1817 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1818 | |
1da177e4 LT |
1819 | /* |
1820 | * we have read a block, now it needs to be re-written, | |
1821 | * or re-read if the read failed. | |
1822 | * We don't do much here, just schedule handling by raid1d | |
1823 | */ | |
4e4cbee9 | 1824 | if (!bio->bi_status) |
1da177e4 | 1825 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1826 | |
1827 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1828 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1829 | } |
1830 | ||
dfcc34c9 ND |
1831 | static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) |
1832 | { | |
1833 | sector_t sync_blocks = 0; | |
1834 | sector_t s = r1_bio->sector; | |
1835 | long sectors_to_go = r1_bio->sectors; | |
1836 | ||
1837 | /* make sure these bits don't get cleared. */ | |
1838 | do { | |
1839 | md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); | |
1840 | s += sync_blocks; | |
1841 | sectors_to_go -= sync_blocks; | |
1842 | } while (sectors_to_go > 0); | |
1843 | } | |
1844 | ||
4246a0b6 | 1845 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1846 | { |
4e4cbee9 | 1847 | int uptodate = !bio->bi_status; |
98d30c58 | 1848 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1849 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1850 | struct r1conf *conf = mddev->private; |
4367af55 N |
1851 | sector_t first_bad; |
1852 | int bad_sectors; | |
854abd75 | 1853 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1854 | |
6b1117d5 | 1855 | if (!uptodate) { |
dfcc34c9 | 1856 | abort_sync_write(mddev, r1_bio); |
854abd75 N |
1857 | set_bit(WriteErrorSeen, &rdev->flags); |
1858 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1859 | set_bit(MD_RECOVERY_NEEDED, & |
1860 | mddev->recovery); | |
d8f05d29 | 1861 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1862 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1863 | &first_bad, &bad_sectors) && |
1864 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1865 | r1_bio->sector, | |
1866 | r1_bio->sectors, | |
1867 | &first_bad, &bad_sectors) | |
1868 | ) | |
4367af55 | 1869 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1870 | |
1da177e4 | 1871 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1872 | int s = r1_bio->sectors; |
d8f05d29 N |
1873 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1874 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1875 | reschedule_retry(r1_bio); |
1876 | else { | |
1877 | put_buf(r1_bio); | |
1878 | md_done_sync(mddev, s, uptodate); | |
1879 | } | |
1da177e4 | 1880 | } |
1da177e4 LT |
1881 | } |
1882 | ||
3cb03002 | 1883 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1884 | int sectors, struct page *page, int rw) |
1885 | { | |
796a5cf0 | 1886 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1887 | /* success */ |
1888 | return 1; | |
19d67169 | 1889 | if (rw == WRITE) { |
d8f05d29 | 1890 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1891 | if (!test_and_set_bit(WantReplacement, |
1892 | &rdev->flags)) | |
1893 | set_bit(MD_RECOVERY_NEEDED, & | |
1894 | rdev->mddev->recovery); | |
1895 | } | |
d8f05d29 N |
1896 | /* need to record an error - either for the block or the device */ |
1897 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1898 | md_error(rdev->mddev, rdev); | |
1899 | return 0; | |
1900 | } | |
1901 | ||
9f2c9d12 | 1902 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1903 | { |
a68e5870 N |
1904 | /* Try some synchronous reads of other devices to get |
1905 | * good data, much like with normal read errors. Only | |
1906 | * read into the pages we already have so we don't | |
1907 | * need to re-issue the read request. | |
1908 | * We don't need to freeze the array, because being in an | |
1909 | * active sync request, there is no normal IO, and | |
1910 | * no overlapping syncs. | |
06f60385 N |
1911 | * We don't need to check is_badblock() again as we |
1912 | * made sure that anything with a bad block in range | |
1913 | * will have bi_end_io clear. | |
a68e5870 | 1914 | */ |
fd01b88c | 1915 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1916 | struct r1conf *conf = mddev->private; |
a68e5870 | 1917 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 1918 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
1919 | sector_t sect = r1_bio->sector; |
1920 | int sectors = r1_bio->sectors; | |
1921 | int idx = 0; | |
2e52d449 N |
1922 | struct md_rdev *rdev; |
1923 | ||
1924 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
1925 | if (test_bit(FailFast, &rdev->flags)) { | |
1926 | /* Don't try recovering from here - just fail it | |
1927 | * ... unless it is the last working device of course */ | |
1928 | md_error(mddev, rdev); | |
1929 | if (test_bit(Faulty, &rdev->flags)) | |
1930 | /* Don't try to read from here, but make sure | |
1931 | * put_buf does it's thing | |
1932 | */ | |
1933 | bio->bi_end_io = end_sync_write; | |
1934 | } | |
a68e5870 N |
1935 | |
1936 | while(sectors) { | |
1937 | int s = sectors; | |
1938 | int d = r1_bio->read_disk; | |
1939 | int success = 0; | |
78d7f5f7 | 1940 | int start; |
a68e5870 N |
1941 | |
1942 | if (s > (PAGE_SIZE>>9)) | |
1943 | s = PAGE_SIZE >> 9; | |
1944 | do { | |
1945 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1946 | /* No rcu protection needed here devices | |
1947 | * can only be removed when no resync is | |
1948 | * active, and resync is currently active | |
1949 | */ | |
1950 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1951 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 1952 | pages[idx], |
796a5cf0 | 1953 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
1954 | success = 1; |
1955 | break; | |
1956 | } | |
1957 | } | |
1958 | d++; | |
8f19ccb2 | 1959 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1960 | d = 0; |
1961 | } while (!success && d != r1_bio->read_disk); | |
1962 | ||
78d7f5f7 | 1963 | if (!success) { |
a68e5870 | 1964 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1965 | int abort = 0; |
1966 | /* Cannot read from anywhere, this block is lost. | |
1967 | * Record a bad block on each device. If that doesn't | |
1968 | * work just disable and interrupt the recovery. | |
1969 | * Don't fail devices as that won't really help. | |
1970 | */ | |
1d41c216 | 1971 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
74d46992 | 1972 | mdname(mddev), bio_devname(bio, b), |
1d41c216 | 1973 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 1974 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1975 | rdev = conf->mirrors[d].rdev; |
1976 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1977 | continue; | |
1978 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1979 | abort = 1; | |
1980 | } | |
1981 | if (abort) { | |
d890fa2b N |
1982 | conf->recovery_disabled = |
1983 | mddev->recovery_disabled; | |
3a9f28a5 N |
1984 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1985 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1986 | put_buf(r1_bio); | |
1987 | return 0; | |
1988 | } | |
1989 | /* Try next page */ | |
1990 | sectors -= s; | |
1991 | sect += s; | |
1992 | idx++; | |
1993 | continue; | |
d11c171e | 1994 | } |
78d7f5f7 N |
1995 | |
1996 | start = d; | |
1997 | /* write it back and re-read */ | |
1998 | while (d != r1_bio->read_disk) { | |
1999 | if (d == 0) | |
8f19ccb2 | 2000 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2001 | d--; |
2002 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2003 | continue; | |
2004 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2005 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2006 | pages[idx], |
d8f05d29 | 2007 | WRITE) == 0) { |
78d7f5f7 N |
2008 | r1_bio->bios[d]->bi_end_io = NULL; |
2009 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2010 | } |
78d7f5f7 N |
2011 | } |
2012 | d = start; | |
2013 | while (d != r1_bio->read_disk) { | |
2014 | if (d == 0) | |
8f19ccb2 | 2015 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2016 | d--; |
2017 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2018 | continue; | |
2019 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2020 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2021 | pages[idx], |
d8f05d29 | 2022 | READ) != 0) |
9d3d8011 | 2023 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2024 | } |
a68e5870 N |
2025 | sectors -= s; |
2026 | sect += s; | |
2027 | idx ++; | |
2028 | } | |
78d7f5f7 | 2029 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2030 | bio->bi_status = 0; |
a68e5870 N |
2031 | return 1; |
2032 | } | |
2033 | ||
c95e6385 | 2034 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2035 | { |
2036 | /* We have read all readable devices. If we haven't | |
2037 | * got the block, then there is no hope left. | |
2038 | * If we have, then we want to do a comparison | |
2039 | * and skip the write if everything is the same. | |
2040 | * If any blocks failed to read, then we need to | |
2041 | * attempt an over-write | |
2042 | */ | |
fd01b88c | 2043 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2044 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2045 | int primary; |
2046 | int i; | |
f4380a91 | 2047 | int vcnt; |
a68e5870 | 2048 | |
30bc9b53 N |
2049 | /* Fix variable parts of all bios */ |
2050 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2051 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2052 | blk_status_t status; |
30bc9b53 | 2053 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2054 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2055 | if (b->bi_end_io != end_sync_read) |
2056 | continue; | |
4246a0b6 | 2057 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2058 | status = b->bi_status; |
30bc9b53 | 2059 | bio_reset(b); |
4e4cbee9 | 2060 | b->bi_status = status; |
4f024f37 | 2061 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2062 | conf->mirrors[i].rdev->data_offset; |
74d46992 | 2063 | bio_set_dev(b, conf->mirrors[i].rdev->bdev); |
30bc9b53 | 2064 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2065 | rp->raid_bio = r1_bio; |
2066 | b->bi_private = rp; | |
30bc9b53 | 2067 | |
fb0eb5df ML |
2068 | /* initialize bvec table again */ |
2069 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2070 | } |
8f19ccb2 | 2071 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2072 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2073 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2074 | r1_bio->bios[primary]->bi_end_io = NULL; |
2075 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2076 | break; | |
2077 | } | |
2078 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2079 | for (i = 0; i < conf->raid_disks * 2; i++) { |
2b070cfe | 2080 | int j = 0; |
78d7f5f7 N |
2081 | struct bio *pbio = r1_bio->bios[primary]; |
2082 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2083 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2084 | struct page **ppages = get_resync_pages(pbio)->pages; |
2085 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2086 | struct bio_vec *bi; |
8fc04e6e | 2087 | int page_len[RESYNC_PAGES] = { 0 }; |
6dc4f100 | 2088 | struct bvec_iter_all iter_all; |
a68e5870 | 2089 | |
2aabaa65 | 2090 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2091 | continue; |
4246a0b6 | 2092 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2093 | sbio->bi_status = 0; |
78d7f5f7 | 2094 | |
2b070cfe CH |
2095 | bio_for_each_segment_all(bi, sbio, iter_all) |
2096 | page_len[j++] = bi->bv_len; | |
60928a91 | 2097 | |
4e4cbee9 | 2098 | if (!status) { |
78d7f5f7 | 2099 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2100 | if (memcmp(page_address(ppages[j]), |
2101 | page_address(spages[j]), | |
60928a91 | 2102 | page_len[j])) |
78d7f5f7 | 2103 | break; |
69382e85 | 2104 | } |
78d7f5f7 N |
2105 | } else |
2106 | j = 0; | |
2107 | if (j >= 0) | |
7f7583d4 | 2108 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2109 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2110 | && !status)) { |
78d7f5f7 N |
2111 | /* No need to write to this device. */ |
2112 | sbio->bi_end_io = NULL; | |
2113 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2114 | continue; | |
2115 | } | |
d3b45c2a KO |
2116 | |
2117 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2118 | } |
a68e5870 N |
2119 | } |
2120 | ||
9f2c9d12 | 2121 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2122 | { |
e8096360 | 2123 | struct r1conf *conf = mddev->private; |
a68e5870 | 2124 | int i; |
8f19ccb2 | 2125 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2126 | struct bio *wbio; |
a68e5870 | 2127 | |
a68e5870 N |
2128 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2129 | /* ouch - failed to read all of that. */ | |
2130 | if (!fix_sync_read_error(r1_bio)) | |
2131 | return; | |
7ca78d57 N |
2132 | |
2133 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2134 | process_checks(r1_bio); |
2135 | ||
d11c171e N |
2136 | /* |
2137 | * schedule writes | |
2138 | */ | |
1da177e4 LT |
2139 | atomic_set(&r1_bio->remaining, 1); |
2140 | for (i = 0; i < disks ; i++) { | |
2141 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2142 | if (wbio->bi_end_io == NULL || |
2143 | (wbio->bi_end_io == end_sync_read && | |
2144 | (i == r1_bio->read_disk || | |
2145 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2146 | continue; |
dfcc34c9 ND |
2147 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { |
2148 | abort_sync_write(mddev, r1_bio); | |
0c9d5b12 | 2149 | continue; |
dfcc34c9 | 2150 | } |
1da177e4 | 2151 | |
796a5cf0 | 2152 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
212e7eb7 N |
2153 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2154 | wbio->bi_opf |= MD_FAILFAST; | |
2155 | ||
3e198f78 | 2156 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2157 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2158 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2159 | |
1da177e4 LT |
2160 | generic_make_request(wbio); |
2161 | } | |
2162 | ||
2163 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2164 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2165 | int s = r1_bio->sectors; |
2166 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2167 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2168 | reschedule_retry(r1_bio); | |
2169 | else { | |
2170 | put_buf(r1_bio); | |
2171 | md_done_sync(mddev, s, 1); | |
2172 | } | |
1da177e4 LT |
2173 | } |
2174 | } | |
2175 | ||
2176 | /* | |
2177 | * This is a kernel thread which: | |
2178 | * | |
2179 | * 1. Retries failed read operations on working mirrors. | |
2180 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2181 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2182 | */ |
2183 | ||
e8096360 | 2184 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2185 | sector_t sect, int sectors) |
2186 | { | |
fd01b88c | 2187 | struct mddev *mddev = conf->mddev; |
867868fb N |
2188 | while(sectors) { |
2189 | int s = sectors; | |
2190 | int d = read_disk; | |
2191 | int success = 0; | |
2192 | int start; | |
3cb03002 | 2193 | struct md_rdev *rdev; |
867868fb N |
2194 | |
2195 | if (s > (PAGE_SIZE>>9)) | |
2196 | s = PAGE_SIZE >> 9; | |
2197 | ||
2198 | do { | |
d2eb35ac N |
2199 | sector_t first_bad; |
2200 | int bad_sectors; | |
2201 | ||
707a6a42 N |
2202 | rcu_read_lock(); |
2203 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2204 | if (rdev && |
da8840a7 | 2205 | (test_bit(In_sync, &rdev->flags) || |
2206 | (!test_bit(Faulty, &rdev->flags) && | |
2207 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2208 | is_badblock(rdev, sect, s, |
707a6a42 N |
2209 | &first_bad, &bad_sectors) == 0) { |
2210 | atomic_inc(&rdev->nr_pending); | |
2211 | rcu_read_unlock(); | |
2212 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2213 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2214 | success = 1; |
2215 | rdev_dec_pending(rdev, mddev); | |
2216 | if (success) | |
2217 | break; | |
2218 | } else | |
2219 | rcu_read_unlock(); | |
2220 | d++; | |
2221 | if (d == conf->raid_disks * 2) | |
2222 | d = 0; | |
867868fb N |
2223 | } while (!success && d != read_disk); |
2224 | ||
2225 | if (!success) { | |
d8f05d29 | 2226 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2227 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2228 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2229 | md_error(mddev, rdev); | |
867868fb N |
2230 | break; |
2231 | } | |
2232 | /* write it back and re-read */ | |
2233 | start = d; | |
2234 | while (d != read_disk) { | |
2235 | if (d==0) | |
8f19ccb2 | 2236 | d = conf->raid_disks * 2; |
867868fb | 2237 | d--; |
707a6a42 N |
2238 | rcu_read_lock(); |
2239 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2240 | if (rdev && |
707a6a42 N |
2241 | !test_bit(Faulty, &rdev->flags)) { |
2242 | atomic_inc(&rdev->nr_pending); | |
2243 | rcu_read_unlock(); | |
d8f05d29 N |
2244 | r1_sync_page_io(rdev, sect, s, |
2245 | conf->tmppage, WRITE); | |
707a6a42 N |
2246 | rdev_dec_pending(rdev, mddev); |
2247 | } else | |
2248 | rcu_read_unlock(); | |
867868fb N |
2249 | } |
2250 | d = start; | |
2251 | while (d != read_disk) { | |
2252 | char b[BDEVNAME_SIZE]; | |
2253 | if (d==0) | |
8f19ccb2 | 2254 | d = conf->raid_disks * 2; |
867868fb | 2255 | d--; |
707a6a42 N |
2256 | rcu_read_lock(); |
2257 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2258 | if (rdev && |
b8cb6b4c | 2259 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2260 | atomic_inc(&rdev->nr_pending); |
2261 | rcu_read_unlock(); | |
d8f05d29 N |
2262 | if (r1_sync_page_io(rdev, sect, s, |
2263 | conf->tmppage, READ)) { | |
867868fb | 2264 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2265 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2266 | mdname(mddev), s, | |
2267 | (unsigned long long)(sect + | |
2268 | rdev->data_offset), | |
2269 | bdevname(rdev->bdev, b)); | |
867868fb | 2270 | } |
707a6a42 N |
2271 | rdev_dec_pending(rdev, mddev); |
2272 | } else | |
2273 | rcu_read_unlock(); | |
867868fb N |
2274 | } |
2275 | sectors -= s; | |
2276 | sect += s; | |
2277 | } | |
2278 | } | |
2279 | ||
9f2c9d12 | 2280 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2281 | { |
fd01b88c | 2282 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2283 | struct r1conf *conf = mddev->private; |
3cb03002 | 2284 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2285 | |
2286 | /* bio has the data to be written to device 'i' where | |
2287 | * we just recently had a write error. | |
2288 | * We repeatedly clone the bio and trim down to one block, | |
2289 | * then try the write. Where the write fails we record | |
2290 | * a bad block. | |
2291 | * It is conceivable that the bio doesn't exactly align with | |
2292 | * blocks. We must handle this somehow. | |
2293 | * | |
2294 | * We currently own a reference on the rdev. | |
2295 | */ | |
2296 | ||
2297 | int block_sectors; | |
2298 | sector_t sector; | |
2299 | int sectors; | |
2300 | int sect_to_write = r1_bio->sectors; | |
2301 | int ok = 1; | |
2302 | ||
2303 | if (rdev->badblocks.shift < 0) | |
2304 | return 0; | |
2305 | ||
ab713cdc ND |
2306 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2307 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2308 | sector = r1_bio->sector; |
2309 | sectors = ((sector + block_sectors) | |
2310 | & ~(sector_t)(block_sectors - 1)) | |
2311 | - sector; | |
2312 | ||
cd5ff9a1 N |
2313 | while (sect_to_write) { |
2314 | struct bio *wbio; | |
2315 | if (sectors > sect_to_write) | |
2316 | sectors = sect_to_write; | |
2317 | /* Write at 'sector' for 'sectors'*/ | |
2318 | ||
b783863f | 2319 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
841c1316 ML |
2320 | wbio = bio_clone_fast(r1_bio->behind_master_bio, |
2321 | GFP_NOIO, | |
afeee514 | 2322 | &mddev->bio_set); |
b783863f | 2323 | } else { |
d7a10308 | 2324 | wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, |
afeee514 | 2325 | &mddev->bio_set); |
b783863f KO |
2326 | } |
2327 | ||
796a5cf0 | 2328 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2329 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2330 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2331 | |
6678d83f | 2332 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2333 | wbio->bi_iter.bi_sector += rdev->data_offset; |
74d46992 | 2334 | bio_set_dev(wbio, rdev->bdev); |
4e49ea4a MC |
2335 | |
2336 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2337 | /* failure! */ |
2338 | ok = rdev_set_badblocks(rdev, sector, | |
2339 | sectors, 0) | |
2340 | && ok; | |
2341 | ||
2342 | bio_put(wbio); | |
2343 | sect_to_write -= sectors; | |
2344 | sector += sectors; | |
2345 | sectors = block_sectors; | |
2346 | } | |
2347 | return ok; | |
2348 | } | |
2349 | ||
e8096360 | 2350 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2351 | { |
2352 | int m; | |
2353 | int s = r1_bio->sectors; | |
8f19ccb2 | 2354 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2355 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2356 | struct bio *bio = r1_bio->bios[m]; |
2357 | if (bio->bi_end_io == NULL) | |
2358 | continue; | |
4e4cbee9 | 2359 | if (!bio->bi_status && |
62096bce | 2360 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2361 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2362 | } |
4e4cbee9 | 2363 | if (bio->bi_status && |
62096bce N |
2364 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2365 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2366 | md_error(conf->mddev, rdev); | |
2367 | } | |
2368 | } | |
2369 | put_buf(r1_bio); | |
2370 | md_done_sync(conf->mddev, s, 1); | |
2371 | } | |
2372 | ||
e8096360 | 2373 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2374 | { |
fd76863e | 2375 | int m, idx; |
55ce74d4 | 2376 | bool fail = false; |
fd76863e | 2377 | |
8f19ccb2 | 2378 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2379 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2380 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2381 | rdev_clear_badblocks(rdev, |
2382 | r1_bio->sector, | |
c6563a8c | 2383 | r1_bio->sectors, 0); |
62096bce N |
2384 | rdev_dec_pending(rdev, conf->mddev); |
2385 | } else if (r1_bio->bios[m] != NULL) { | |
2386 | /* This drive got a write error. We need to | |
2387 | * narrow down and record precise write | |
2388 | * errors. | |
2389 | */ | |
55ce74d4 | 2390 | fail = true; |
62096bce N |
2391 | if (!narrow_write_error(r1_bio, m)) { |
2392 | md_error(conf->mddev, | |
2393 | conf->mirrors[m].rdev); | |
2394 | /* an I/O failed, we can't clear the bitmap */ | |
2395 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2396 | } | |
2397 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2398 | conf->mddev); | |
2399 | } | |
55ce74d4 N |
2400 | if (fail) { |
2401 | spin_lock_irq(&conf->device_lock); | |
2402 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2403 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2404 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2405 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2406 | /* |
2407 | * In case freeze_array() is waiting for condition | |
2408 | * get_unqueued_pending() == extra to be true. | |
2409 | */ | |
2410 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2411 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2412 | } else { |
2413 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2414 | close_write(r1_bio); | |
55ce74d4 | 2415 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2416 | } |
62096bce N |
2417 | } |
2418 | ||
e8096360 | 2419 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2420 | { |
fd01b88c | 2421 | struct mddev *mddev = conf->mddev; |
62096bce | 2422 | struct bio *bio; |
3cb03002 | 2423 | struct md_rdev *rdev; |
62096bce N |
2424 | |
2425 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2426 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2427 | * the block and we can fix it. | |
2428 | * We freeze all other IO, and try reading the block from | |
2429 | * other devices. When we find one, we re-write | |
2430 | * and check it that fixes the read error. | |
2431 | * This is all done synchronously while the array is | |
2432 | * frozen | |
2433 | */ | |
7449f699 TM |
2434 | |
2435 | bio = r1_bio->bios[r1_bio->read_disk]; | |
7449f699 TM |
2436 | bio_put(bio); |
2437 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2438 | ||
2e52d449 N |
2439 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2440 | if (mddev->ro == 0 | |
2441 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2442 | freeze_array(conf, 1); |
62096bce N |
2443 | fix_read_error(conf, r1_bio->read_disk, |
2444 | r1_bio->sector, r1_bio->sectors); | |
2445 | unfreeze_array(conf); | |
b33d1062 GK |
2446 | } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { |
2447 | md_error(mddev, rdev); | |
7449f699 TM |
2448 | } else { |
2449 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2450 | } | |
2451 | ||
2e52d449 | 2452 | rdev_dec_pending(rdev, conf->mddev); |
689389a0 N |
2453 | allow_barrier(conf, r1_bio->sector); |
2454 | bio = r1_bio->master_bio; | |
62096bce | 2455 | |
689389a0 N |
2456 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2457 | r1_bio->state = 0; | |
2458 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
62096bce N |
2459 | } |
2460 | ||
4ed8731d | 2461 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2462 | { |
4ed8731d | 2463 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2464 | struct r1bio *r1_bio; |
1da177e4 | 2465 | unsigned long flags; |
e8096360 | 2466 | struct r1conf *conf = mddev->private; |
1da177e4 | 2467 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2468 | struct blk_plug plug; |
fd76863e | 2469 | int idx; |
1da177e4 LT |
2470 | |
2471 | md_check_recovery(mddev); | |
e1dfa0a2 | 2472 | |
55ce74d4 | 2473 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2474 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2475 | LIST_HEAD(tmp); |
2476 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2477 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2478 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2479 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2480 | while (!list_empty(&tmp)) { | |
a452744b MP |
2481 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2482 | retry_list); | |
55ce74d4 | 2483 | list_del(&r1_bio->retry_list); |
fd76863e | 2484 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2485 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2486 | if (mddev->degraded) |
2487 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2488 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2489 | close_write(r1_bio); | |
55ce74d4 N |
2490 | raid_end_bio_io(r1_bio); |
2491 | } | |
2492 | } | |
2493 | ||
e1dfa0a2 | 2494 | blk_start_plug(&plug); |
1da177e4 | 2495 | for (;;) { |
191ea9b2 | 2496 | |
0021b7bc | 2497 | flush_pending_writes(conf); |
191ea9b2 | 2498 | |
a35e63ef N |
2499 | spin_lock_irqsave(&conf->device_lock, flags); |
2500 | if (list_empty(head)) { | |
2501 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2502 | break; |
a35e63ef | 2503 | } |
9f2c9d12 | 2504 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2505 | list_del(head->prev); |
fd76863e | 2506 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2507 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2508 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2509 | ||
2510 | mddev = r1_bio->mddev; | |
070ec55d | 2511 | conf = mddev->private; |
4367af55 | 2512 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2513 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2514 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2515 | handle_sync_write_finished(conf, r1_bio); | |
2516 | else | |
4367af55 | 2517 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2518 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2519 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2520 | handle_write_finished(conf, r1_bio); | |
2521 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2522 | handle_read_error(conf, r1_bio); | |
2523 | else | |
c230e7e5 | 2524 | WARN_ON_ONCE(1); |
62096bce | 2525 | |
1d9d5241 | 2526 | cond_resched(); |
2953079c | 2527 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2528 | md_check_recovery(mddev); |
1da177e4 | 2529 | } |
e1dfa0a2 | 2530 | blk_finish_plug(&plug); |
1da177e4 LT |
2531 | } |
2532 | ||
e8096360 | 2533 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2534 | { |
2535 | int buffs; | |
2536 | ||
2537 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
afeee514 KO |
2538 | BUG_ON(mempool_initialized(&conf->r1buf_pool)); |
2539 | ||
2540 | return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, | |
2541 | r1buf_pool_free, conf->poolinfo); | |
1da177e4 LT |
2542 | } |
2543 | ||
208410b5 SL |
2544 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2545 | { | |
afeee514 | 2546 | struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); |
208410b5 SL |
2547 | struct resync_pages *rps; |
2548 | struct bio *bio; | |
2549 | int i; | |
2550 | ||
2551 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2552 | bio = r1bio->bios[i]; | |
2553 | rps = bio->bi_private; | |
2554 | bio_reset(bio); | |
2555 | bio->bi_private = rps; | |
2556 | } | |
2557 | r1bio->master_bio = NULL; | |
2558 | return r1bio; | |
2559 | } | |
2560 | ||
1da177e4 LT |
2561 | /* |
2562 | * perform a "sync" on one "block" | |
2563 | * | |
2564 | * We need to make sure that no normal I/O request - particularly write | |
2565 | * requests - conflict with active sync requests. | |
2566 | * | |
2567 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2568 | * that can be installed to exclude normal IO requests. | |
2569 | */ | |
2570 | ||
849674e4 SL |
2571 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2572 | int *skipped) | |
1da177e4 | 2573 | { |
e8096360 | 2574 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2575 | struct r1bio *r1_bio; |
1da177e4 LT |
2576 | struct bio *bio; |
2577 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2578 | int disk = -1; |
1da177e4 | 2579 | int i; |
3e198f78 N |
2580 | int wonly = -1; |
2581 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2582 | sector_t sync_blocks; |
e3b9703e | 2583 | int still_degraded = 0; |
06f60385 N |
2584 | int good_sectors = RESYNC_SECTORS; |
2585 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2586 | int idx = sector_to_idx(sector_nr); |
022e510f | 2587 | int page_idx = 0; |
1da177e4 | 2588 | |
afeee514 | 2589 | if (!mempool_initialized(&conf->r1buf_pool)) |
1da177e4 | 2590 | if (init_resync(conf)) |
57afd89f | 2591 | return 0; |
1da177e4 | 2592 | |
58c0fed4 | 2593 | max_sector = mddev->dev_sectors; |
1da177e4 | 2594 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2595 | /* If we aborted, we need to abort the |
2596 | * sync on the 'current' bitmap chunk (there will | |
2597 | * only be one in raid1 resync. | |
2598 | * We can find the current addess in mddev->curr_resync | |
2599 | */ | |
6a806c51 | 2600 | if (mddev->curr_resync < max_sector) /* aborted */ |
e64e4018 AS |
2601 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
2602 | &sync_blocks, 1); | |
6a806c51 | 2603 | else /* completed sync */ |
191ea9b2 | 2604 | conf->fullsync = 0; |
6a806c51 | 2605 | |
e64e4018 | 2606 | md_bitmap_close_sync(mddev->bitmap); |
1da177e4 | 2607 | close_sync(conf); |
c40f341f GR |
2608 | |
2609 | if (mddev_is_clustered(mddev)) { | |
2610 | conf->cluster_sync_low = 0; | |
2611 | conf->cluster_sync_high = 0; | |
c40f341f | 2612 | } |
1da177e4 LT |
2613 | return 0; |
2614 | } | |
2615 | ||
07d84d10 N |
2616 | if (mddev->bitmap == NULL && |
2617 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2618 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2619 | conf->fullsync == 0) { |
2620 | *skipped = 1; | |
2621 | return max_sector - sector_nr; | |
2622 | } | |
6394cca5 N |
2623 | /* before building a request, check if we can skip these blocks.. |
2624 | * This call the bitmap_start_sync doesn't actually record anything | |
2625 | */ | |
e64e4018 | 2626 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2627 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2628 | /* We can skip this block, and probably several more */ |
2629 | *skipped = 1; | |
2630 | return sync_blocks; | |
2631 | } | |
17999be4 | 2632 | |
7ac50447 TM |
2633 | /* |
2634 | * If there is non-resync activity waiting for a turn, then let it | |
2635 | * though before starting on this new sync request. | |
2636 | */ | |
824e47da | 2637 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2638 | schedule_timeout_uninterruptible(1); |
2639 | ||
c40f341f GR |
2640 | /* we are incrementing sector_nr below. To be safe, we check against |
2641 | * sector_nr + two times RESYNC_SECTORS | |
2642 | */ | |
2643 | ||
e64e4018 | 2644 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
c40f341f | 2645 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
17999be4 | 2646 | |
8c242593 YY |
2647 | |
2648 | if (raise_barrier(conf, sector_nr)) | |
2649 | return 0; | |
2650 | ||
2651 | r1_bio = raid1_alloc_init_r1buf(conf); | |
1da177e4 | 2652 | |
3e198f78 | 2653 | rcu_read_lock(); |
1da177e4 | 2654 | /* |
3e198f78 N |
2655 | * If we get a correctably read error during resync or recovery, |
2656 | * we might want to read from a different device. So we | |
2657 | * flag all drives that could conceivably be read from for READ, | |
2658 | * and any others (which will be non-In_sync devices) for WRITE. | |
2659 | * If a read fails, we try reading from something else for which READ | |
2660 | * is OK. | |
1da177e4 | 2661 | */ |
1da177e4 | 2662 | |
1da177e4 LT |
2663 | r1_bio->mddev = mddev; |
2664 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2665 | r1_bio->state = 0; |
1da177e4 | 2666 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2667 | /* make sure good_sectors won't go across barrier unit boundary */ |
2668 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2669 | |
8f19ccb2 | 2670 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2671 | struct md_rdev *rdev; |
1da177e4 | 2672 | bio = r1_bio->bios[i]; |
1da177e4 | 2673 | |
3e198f78 N |
2674 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2675 | if (rdev == NULL || | |
06f60385 | 2676 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2677 | if (i < conf->raid_disks) |
2678 | still_degraded = 1; | |
3e198f78 | 2679 | } else if (!test_bit(In_sync, &rdev->flags)) { |
796a5cf0 | 2680 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
2681 | bio->bi_end_io = end_sync_write; |
2682 | write_targets ++; | |
3e198f78 N |
2683 | } else { |
2684 | /* may need to read from here */ | |
06f60385 N |
2685 | sector_t first_bad = MaxSector; |
2686 | int bad_sectors; | |
2687 | ||
2688 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2689 | &first_bad, &bad_sectors)) { | |
2690 | if (first_bad > sector_nr) | |
2691 | good_sectors = first_bad - sector_nr; | |
2692 | else { | |
2693 | bad_sectors -= (sector_nr - first_bad); | |
2694 | if (min_bad == 0 || | |
2695 | min_bad > bad_sectors) | |
2696 | min_bad = bad_sectors; | |
2697 | } | |
2698 | } | |
2699 | if (sector_nr < first_bad) { | |
2700 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2701 | if (wonly < 0) | |
2702 | wonly = i; | |
2703 | } else { | |
2704 | if (disk < 0) | |
2705 | disk = i; | |
2706 | } | |
796a5cf0 | 2707 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
2708 | bio->bi_end_io = end_sync_read; |
2709 | read_targets++; | |
d57368af AL |
2710 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2711 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2712 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2713 | /* | |
2714 | * The device is suitable for reading (InSync), | |
2715 | * but has bad block(s) here. Let's try to correct them, | |
2716 | * if we are doing resync or repair. Otherwise, leave | |
2717 | * this device alone for this sync request. | |
2718 | */ | |
796a5cf0 | 2719 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
2720 | bio->bi_end_io = end_sync_write; |
2721 | write_targets++; | |
3e198f78 | 2722 | } |
3e198f78 | 2723 | } |
06f60385 N |
2724 | if (bio->bi_end_io) { |
2725 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2726 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2727 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2728 | if (test_bit(FailFast, &rdev->flags)) |
2729 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2730 | } |
1da177e4 | 2731 | } |
3e198f78 N |
2732 | rcu_read_unlock(); |
2733 | if (disk < 0) | |
2734 | disk = wonly; | |
2735 | r1_bio->read_disk = disk; | |
191ea9b2 | 2736 | |
06f60385 N |
2737 | if (read_targets == 0 && min_bad > 0) { |
2738 | /* These sectors are bad on all InSync devices, so we | |
2739 | * need to mark them bad on all write targets | |
2740 | */ | |
2741 | int ok = 1; | |
8f19ccb2 | 2742 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2743 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2744 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2745 | ok = rdev_set_badblocks(rdev, sector_nr, |
2746 | min_bad, 0 | |
2747 | ) && ok; | |
2748 | } | |
2953079c | 2749 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2750 | *skipped = 1; |
2751 | put_buf(r1_bio); | |
2752 | ||
2753 | if (!ok) { | |
2754 | /* Cannot record the badblocks, so need to | |
2755 | * abort the resync. | |
2756 | * If there are multiple read targets, could just | |
2757 | * fail the really bad ones ??? | |
2758 | */ | |
2759 | conf->recovery_disabled = mddev->recovery_disabled; | |
2760 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2761 | return 0; | |
2762 | } else | |
2763 | return min_bad; | |
2764 | ||
2765 | } | |
2766 | if (min_bad > 0 && min_bad < good_sectors) { | |
2767 | /* only resync enough to reach the next bad->good | |
2768 | * transition */ | |
2769 | good_sectors = min_bad; | |
2770 | } | |
2771 | ||
3e198f78 N |
2772 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2773 | /* extra read targets are also write targets */ | |
2774 | write_targets += read_targets-1; | |
2775 | ||
2776 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2777 | /* There is nowhere to write, so all non-sync |
2778 | * drives must be failed - so we are finished | |
2779 | */ | |
b7219ccb N |
2780 | sector_t rv; |
2781 | if (min_bad > 0) | |
2782 | max_sector = sector_nr + min_bad; | |
2783 | rv = max_sector - sector_nr; | |
57afd89f | 2784 | *skipped = 1; |
1da177e4 | 2785 | put_buf(r1_bio); |
1da177e4 LT |
2786 | return rv; |
2787 | } | |
2788 | ||
c6207277 N |
2789 | if (max_sector > mddev->resync_max) |
2790 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2791 | if (max_sector > sector_nr + good_sectors) |
2792 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2793 | nr_sectors = 0; |
289e99e8 | 2794 | sync_blocks = 0; |
1da177e4 LT |
2795 | do { |
2796 | struct page *page; | |
2797 | int len = PAGE_SIZE; | |
2798 | if (sector_nr + (len>>9) > max_sector) | |
2799 | len = (max_sector - sector_nr) << 9; | |
2800 | if (len == 0) | |
2801 | break; | |
6a806c51 | 2802 | if (sync_blocks == 0) { |
e64e4018 AS |
2803 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
2804 | &sync_blocks, still_degraded) && | |
e5de485f N |
2805 | !conf->fullsync && |
2806 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2807 | break; |
7571ae88 | 2808 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2809 | len = sync_blocks<<9; |
ab7a30c7 | 2810 | } |
191ea9b2 | 2811 | |
8f19ccb2 | 2812 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2813 | struct resync_pages *rp; |
2814 | ||
1da177e4 | 2815 | bio = r1_bio->bios[i]; |
98d30c58 | 2816 | rp = get_resync_pages(bio); |
1da177e4 | 2817 | if (bio->bi_end_io) { |
022e510f | 2818 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2819 | |
2820 | /* | |
2821 | * won't fail because the vec table is big | |
2822 | * enough to hold all these pages | |
2823 | */ | |
2824 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2825 | } |
2826 | } | |
2827 | nr_sectors += len>>9; | |
2828 | sector_nr += len>>9; | |
191ea9b2 | 2829 | sync_blocks -= (len>>9); |
022e510f | 2830 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2831 | |
1da177e4 LT |
2832 | r1_bio->sectors = nr_sectors; |
2833 | ||
c40f341f GR |
2834 | if (mddev_is_clustered(mddev) && |
2835 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2836 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2837 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2838 | /* Send resync message */ | |
2839 | md_cluster_ops->resync_info_update(mddev, | |
2840 | conf->cluster_sync_low, | |
2841 | conf->cluster_sync_high); | |
2842 | } | |
2843 | ||
d11c171e N |
2844 | /* For a user-requested sync, we read all readable devices and do a |
2845 | * compare | |
2846 | */ | |
2847 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2848 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2849 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2850 | bio = r1_bio->bios[i]; |
2851 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2852 | read_targets--; |
74d46992 | 2853 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2854 | if (read_targets == 1) |
2855 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e N |
2856 | generic_make_request(bio); |
2857 | } | |
2858 | } | |
2859 | } else { | |
2860 | atomic_set(&r1_bio->remaining, 1); | |
2861 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2862 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2863 | if (read_targets == 1) |
2864 | bio->bi_opf &= ~MD_FAILFAST; | |
d11c171e | 2865 | generic_make_request(bio); |
1da177e4 | 2866 | |
d11c171e | 2867 | } |
1da177e4 LT |
2868 | return nr_sectors; |
2869 | } | |
2870 | ||
fd01b88c | 2871 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2872 | { |
2873 | if (sectors) | |
2874 | return sectors; | |
2875 | ||
2876 | return mddev->dev_sectors; | |
2877 | } | |
2878 | ||
e8096360 | 2879 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2880 | { |
e8096360 | 2881 | struct r1conf *conf; |
709ae487 | 2882 | int i; |
0eaf822c | 2883 | struct raid1_info *disk; |
3cb03002 | 2884 | struct md_rdev *rdev; |
709ae487 | 2885 | int err = -ENOMEM; |
1da177e4 | 2886 | |
e8096360 | 2887 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2888 | if (!conf) |
709ae487 | 2889 | goto abort; |
1da177e4 | 2890 | |
fd76863e | 2891 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2892 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2893 | if (!conf->nr_pending) |
2894 | goto abort; | |
2895 | ||
2896 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2897 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2898 | if (!conf->nr_waiting) |
2899 | goto abort; | |
2900 | ||
2901 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2902 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2903 | if (!conf->nr_queued) |
2904 | goto abort; | |
2905 | ||
2906 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2907 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2908 | if (!conf->barrier) |
2909 | goto abort; | |
2910 | ||
6396bb22 KC |
2911 | conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
2912 | mddev->raid_disks, 2), | |
2913 | GFP_KERNEL); | |
1da177e4 | 2914 | if (!conf->mirrors) |
709ae487 | 2915 | goto abort; |
1da177e4 | 2916 | |
ddaf22ab N |
2917 | conf->tmppage = alloc_page(GFP_KERNEL); |
2918 | if (!conf->tmppage) | |
709ae487 | 2919 | goto abort; |
ddaf22ab | 2920 | |
709ae487 | 2921 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2922 | if (!conf->poolinfo) |
709ae487 | 2923 | goto abort; |
8f19ccb2 | 2924 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
3f677f9c | 2925 | err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, |
afeee514 KO |
2926 | r1bio_pool_free, conf->poolinfo); |
2927 | if (err) | |
709ae487 N |
2928 | goto abort; |
2929 | ||
afeee514 KO |
2930 | err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
2931 | if (err) | |
c230e7e5 N |
2932 | goto abort; |
2933 | ||
ed9bfdf1 | 2934 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2935 | |
c19d5798 | 2936 | err = -EINVAL; |
e7e72bf6 | 2937 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2938 | rdev_for_each(rdev, mddev) { |
709ae487 | 2939 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2940 | if (disk_idx >= mddev->raid_disks |
2941 | || disk_idx < 0) | |
2942 | continue; | |
c19d5798 | 2943 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2944 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2945 | else |
2946 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2947 | |
c19d5798 N |
2948 | if (disk->rdev) |
2949 | goto abort; | |
1da177e4 | 2950 | disk->rdev = rdev; |
1da177e4 | 2951 | disk->head_position = 0; |
12cee5a8 | 2952 | disk->seq_start = MaxSector; |
1da177e4 LT |
2953 | } |
2954 | conf->raid_disks = mddev->raid_disks; | |
2955 | conf->mddev = mddev; | |
1da177e4 | 2956 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 2957 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
2958 | |
2959 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2960 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2961 | |
191ea9b2 | 2962 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2963 | conf->pending_count = 0; |
d890fa2b | 2964 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2965 | |
c19d5798 | 2966 | err = -EIO; |
8f19ccb2 | 2967 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2968 | |
2969 | disk = conf->mirrors + i; | |
2970 | ||
c19d5798 N |
2971 | if (i < conf->raid_disks && |
2972 | disk[conf->raid_disks].rdev) { | |
2973 | /* This slot has a replacement. */ | |
2974 | if (!disk->rdev) { | |
2975 | /* No original, just make the replacement | |
2976 | * a recovering spare | |
2977 | */ | |
2978 | disk->rdev = | |
2979 | disk[conf->raid_disks].rdev; | |
2980 | disk[conf->raid_disks].rdev = NULL; | |
2981 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2982 | /* Original is not in_sync - bad */ | |
2983 | goto abort; | |
2984 | } | |
2985 | ||
5fd6c1dc N |
2986 | if (!disk->rdev || |
2987 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2988 | disk->head_position = 0; |
4f0a5e01 JB |
2989 | if (disk->rdev && |
2990 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2991 | conf->fullsync = 1; |
be4d3280 | 2992 | } |
1da177e4 | 2993 | } |
709ae487 | 2994 | |
709ae487 | 2995 | err = -ENOMEM; |
0232605d | 2996 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 2997 | if (!conf->thread) |
709ae487 | 2998 | goto abort; |
1da177e4 | 2999 | |
709ae487 N |
3000 | return conf; |
3001 | ||
3002 | abort: | |
3003 | if (conf) { | |
afeee514 | 3004 | mempool_exit(&conf->r1bio_pool); |
709ae487 N |
3005 | kfree(conf->mirrors); |
3006 | safe_put_page(conf->tmppage); | |
3007 | kfree(conf->poolinfo); | |
fd76863e | 3008 | kfree(conf->nr_pending); |
3009 | kfree(conf->nr_waiting); | |
3010 | kfree(conf->nr_queued); | |
3011 | kfree(conf->barrier); | |
afeee514 | 3012 | bioset_exit(&conf->bio_split); |
709ae487 N |
3013 | kfree(conf); |
3014 | } | |
3015 | return ERR_PTR(err); | |
3016 | } | |
3017 | ||
afa0f557 | 3018 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3019 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3020 | { |
e8096360 | 3021 | struct r1conf *conf; |
709ae487 | 3022 | int i; |
3cb03002 | 3023 | struct md_rdev *rdev; |
5220ea1e | 3024 | int ret; |
2ff8cc2c | 3025 | bool discard_supported = false; |
709ae487 N |
3026 | |
3027 | if (mddev->level != 1) { | |
1d41c216 N |
3028 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3029 | mdname(mddev), mddev->level); | |
709ae487 N |
3030 | return -EIO; |
3031 | } | |
3032 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3033 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3034 | mdname(mddev)); | |
709ae487 N |
3035 | return -EIO; |
3036 | } | |
a415c0f1 N |
3037 | if (mddev_init_writes_pending(mddev) < 0) |
3038 | return -ENOMEM; | |
1da177e4 | 3039 | /* |
709ae487 N |
3040 | * copy the already verified devices into our private RAID1 |
3041 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3042 | * should be freed in raid1_free()] |
1da177e4 | 3043 | */ |
709ae487 N |
3044 | if (mddev->private == NULL) |
3045 | conf = setup_conf(mddev); | |
3046 | else | |
3047 | conf = mddev->private; | |
1da177e4 | 3048 | |
709ae487 N |
3049 | if (IS_ERR(conf)) |
3050 | return PTR_ERR(conf); | |
1da177e4 | 3051 | |
3deff1a7 | 3052 | if (mddev->queue) { |
5026d7a9 | 3053 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 CH |
3054 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
3055 | } | |
5026d7a9 | 3056 | |
dafb20fa | 3057 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3058 | if (!mddev->gendisk) |
3059 | continue; | |
709ae487 N |
3060 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3061 | rdev->data_offset << 9); | |
2ff8cc2c SL |
3062 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
3063 | discard_supported = true; | |
1da177e4 | 3064 | } |
191ea9b2 | 3065 | |
709ae487 N |
3066 | mddev->degraded = 0; |
3067 | for (i=0; i < conf->raid_disks; i++) | |
3068 | if (conf->mirrors[i].rdev == NULL || | |
3069 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3070 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3071 | mddev->degraded++; | |
3072 | ||
3073 | if (conf->raid_disks - mddev->degraded == 1) | |
3074 | mddev->recovery_cp = MaxSector; | |
3075 | ||
8c6ac868 | 3076 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3077 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3078 | mdname(mddev)); | |
3079 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3080 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3081 | mddev->raid_disks); |
709ae487 | 3082 | |
1da177e4 LT |
3083 | /* |
3084 | * Ok, everything is just fine now | |
3085 | */ | |
709ae487 N |
3086 | mddev->thread = conf->thread; |
3087 | conf->thread = NULL; | |
3088 | mddev->private = conf; | |
46533ff7 | 3089 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3090 | |
1f403624 | 3091 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3092 | |
1ed7242e | 3093 | if (mddev->queue) { |
2ff8cc2c | 3094 | if (discard_supported) |
8b904b5b | 3095 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, |
2ff8cc2c SL |
3096 | mddev->queue); |
3097 | else | |
8b904b5b | 3098 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, |
2ff8cc2c | 3099 | mddev->queue); |
1ed7242e | 3100 | } |
5220ea1e | 3101 | |
3102 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
3103 | if (ret) { |
3104 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 3105 | raid1_free(mddev, conf); |
5aa61f42 | 3106 | } |
5220ea1e | 3107 | return ret; |
1da177e4 LT |
3108 | } |
3109 | ||
afa0f557 | 3110 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3111 | { |
afa0f557 | 3112 | struct r1conf *conf = priv; |
409c57f3 | 3113 | |
afeee514 | 3114 | mempool_exit(&conf->r1bio_pool); |
990a8baf | 3115 | kfree(conf->mirrors); |
0fea7ed8 | 3116 | safe_put_page(conf->tmppage); |
990a8baf | 3117 | kfree(conf->poolinfo); |
fd76863e | 3118 | kfree(conf->nr_pending); |
3119 | kfree(conf->nr_waiting); | |
3120 | kfree(conf->nr_queued); | |
3121 | kfree(conf->barrier); | |
afeee514 | 3122 | bioset_exit(&conf->bio_split); |
1da177e4 | 3123 | kfree(conf); |
1da177e4 LT |
3124 | } |
3125 | ||
fd01b88c | 3126 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3127 | { |
3128 | /* no resync is happening, and there is enough space | |
3129 | * on all devices, so we can resize. | |
3130 | * We need to make sure resync covers any new space. | |
3131 | * If the array is shrinking we should possibly wait until | |
3132 | * any io in the removed space completes, but it hardly seems | |
3133 | * worth it. | |
3134 | */ | |
a4a6125a N |
3135 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3136 | if (mddev->external_size && | |
3137 | mddev->array_sectors > newsize) | |
b522adcd | 3138 | return -EINVAL; |
a4a6125a | 3139 | if (mddev->bitmap) { |
e64e4018 | 3140 | int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
a4a6125a N |
3141 | if (ret) |
3142 | return ret; | |
3143 | } | |
3144 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3145 | if (sectors > mddev->dev_sectors && |
b098636c | 3146 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3147 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3148 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3149 | } | |
b522adcd | 3150 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3151 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3152 | return 0; |
3153 | } | |
3154 | ||
fd01b88c | 3155 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3156 | { |
3157 | /* We need to: | |
3158 | * 1/ resize the r1bio_pool | |
3159 | * 2/ resize conf->mirrors | |
3160 | * | |
3161 | * We allocate a new r1bio_pool if we can. | |
3162 | * Then raise a device barrier and wait until all IO stops. | |
3163 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3164 | * |
3165 | * At the same time, we "pack" the devices so that all the missing | |
3166 | * devices have the higher raid_disk numbers. | |
1da177e4 | 3167 | */ |
afeee514 | 3168 | mempool_t newpool, oldpool; |
1da177e4 | 3169 | struct pool_info *newpoolinfo; |
0eaf822c | 3170 | struct raid1_info *newmirrors; |
e8096360 | 3171 | struct r1conf *conf = mddev->private; |
63c70c4f | 3172 | int cnt, raid_disks; |
c04be0aa | 3173 | unsigned long flags; |
2214c260 | 3174 | int d, d2; |
afeee514 KO |
3175 | int ret; |
3176 | ||
3177 | memset(&newpool, 0, sizeof(newpool)); | |
3178 | memset(&oldpool, 0, sizeof(oldpool)); | |
1da177e4 | 3179 | |
63c70c4f | 3180 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3181 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3182 | mddev->layout != mddev->new_layout || |
3183 | mddev->level != mddev->new_level) { | |
664e7c41 | 3184 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3185 | mddev->new_layout = mddev->layout; |
3186 | mddev->new_level = mddev->level; | |
3187 | return -EINVAL; | |
3188 | } | |
3189 | ||
2214c260 AP |
3190 | if (!mddev_is_clustered(mddev)) |
3191 | md_allow_write(mddev); | |
2a2275d6 | 3192 | |
63c70c4f N |
3193 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3194 | ||
6ea9c07c N |
3195 | if (raid_disks < conf->raid_disks) { |
3196 | cnt=0; | |
3197 | for (d= 0; d < conf->raid_disks; d++) | |
3198 | if (conf->mirrors[d].rdev) | |
3199 | cnt++; | |
3200 | if (cnt > raid_disks) | |
1da177e4 | 3201 | return -EBUSY; |
6ea9c07c | 3202 | } |
1da177e4 LT |
3203 | |
3204 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3205 | if (!newpoolinfo) | |
3206 | return -ENOMEM; | |
3207 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3208 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 | 3209 | |
3f677f9c | 3210 | ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, |
afeee514 KO |
3211 | r1bio_pool_free, newpoolinfo); |
3212 | if (ret) { | |
1da177e4 | 3213 | kfree(newpoolinfo); |
afeee514 | 3214 | return ret; |
1da177e4 | 3215 | } |
6396bb22 KC |
3216 | newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
3217 | raid_disks, 2), | |
8f19ccb2 | 3218 | GFP_KERNEL); |
1da177e4 LT |
3219 | if (!newmirrors) { |
3220 | kfree(newpoolinfo); | |
afeee514 | 3221 | mempool_exit(&newpool); |
1da177e4 LT |
3222 | return -ENOMEM; |
3223 | } | |
1da177e4 | 3224 | |
e2d59925 | 3225 | freeze_array(conf, 0); |
1da177e4 LT |
3226 | |
3227 | /* ok, everything is stopped */ | |
3228 | oldpool = conf->r1bio_pool; | |
3229 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3230 | |
a88aa786 | 3231 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3232 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3233 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3234 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3235 | rdev->raid_disk = d2; |
36fad858 NK |
3236 | sysfs_unlink_rdev(mddev, rdev); |
3237 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3238 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3239 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3240 | } |
a88aa786 N |
3241 | if (rdev) |
3242 | newmirrors[d2++].rdev = rdev; | |
3243 | } | |
1da177e4 LT |
3244 | kfree(conf->mirrors); |
3245 | conf->mirrors = newmirrors; | |
3246 | kfree(conf->poolinfo); | |
3247 | conf->poolinfo = newpoolinfo; | |
3248 | ||
c04be0aa | 3249 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3250 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3251 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3252 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3253 | mddev->delta_disks = 0; |
1da177e4 | 3254 | |
e2d59925 | 3255 | unfreeze_array(conf); |
1da177e4 | 3256 | |
985ca973 | 3257 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3258 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3259 | md_wakeup_thread(mddev->thread); | |
3260 | ||
afeee514 | 3261 | mempool_exit(&oldpool); |
1da177e4 LT |
3262 | return 0; |
3263 | } | |
3264 | ||
b03e0ccb | 3265 | static void raid1_quiesce(struct mddev *mddev, int quiesce) |
36fa3063 | 3266 | { |
e8096360 | 3267 | struct r1conf *conf = mddev->private; |
36fa3063 | 3268 | |
b03e0ccb | 3269 | if (quiesce) |
07169fd4 | 3270 | freeze_array(conf, 0); |
b03e0ccb | 3271 | else |
07169fd4 | 3272 | unfreeze_array(conf); |
36fa3063 N |
3273 | } |
3274 | ||
fd01b88c | 3275 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3276 | { |
3277 | /* raid1 can take over: | |
3278 | * raid5 with 2 devices, any layout or chunk size | |
3279 | */ | |
3280 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3281 | struct r1conf *conf; |
709ae487 N |
3282 | mddev->new_level = 1; |
3283 | mddev->new_layout = 0; | |
3284 | mddev->new_chunk_sectors = 0; | |
3285 | conf = setup_conf(mddev); | |
6995f0b2 | 3286 | if (!IS_ERR(conf)) { |
07169fd4 | 3287 | /* Array must appear to be quiesced */ |
3288 | conf->array_frozen = 1; | |
394ed8e4 SL |
3289 | mddev_clear_unsupported_flags(mddev, |
3290 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3291 | } |
709ae487 N |
3292 | return conf; |
3293 | } | |
3294 | return ERR_PTR(-EINVAL); | |
3295 | } | |
1da177e4 | 3296 | |
84fc4b56 | 3297 | static struct md_personality raid1_personality = |
1da177e4 LT |
3298 | { |
3299 | .name = "raid1", | |
2604b703 | 3300 | .level = 1, |
1da177e4 | 3301 | .owner = THIS_MODULE, |
849674e4 SL |
3302 | .make_request = raid1_make_request, |
3303 | .run = raid1_run, | |
afa0f557 | 3304 | .free = raid1_free, |
849674e4 SL |
3305 | .status = raid1_status, |
3306 | .error_handler = raid1_error, | |
1da177e4 LT |
3307 | .hot_add_disk = raid1_add_disk, |
3308 | .hot_remove_disk= raid1_remove_disk, | |
3309 | .spare_active = raid1_spare_active, | |
849674e4 | 3310 | .sync_request = raid1_sync_request, |
1da177e4 | 3311 | .resize = raid1_resize, |
80c3a6ce | 3312 | .size = raid1_size, |
63c70c4f | 3313 | .check_reshape = raid1_reshape, |
36fa3063 | 3314 | .quiesce = raid1_quiesce, |
709ae487 | 3315 | .takeover = raid1_takeover, |
5c675f83 | 3316 | .congested = raid1_congested, |
1da177e4 LT |
3317 | }; |
3318 | ||
3319 | static int __init raid_init(void) | |
3320 | { | |
2604b703 | 3321 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3322 | } |
3323 | ||
3324 | static void raid_exit(void) | |
3325 | { | |
2604b703 | 3326 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3327 | } |
3328 | ||
3329 | module_init(raid_init); | |
3330 | module_exit(raid_exit); | |
3331 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3332 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3333 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3334 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3335 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3336 | |
3337 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |