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> |
69b00b5b | 32 | #include <linux/interval_tree_generic.h> |
3f07c014 | 33 | |
109e3765 | 34 | #include <trace/events/block.h> |
3f07c014 | 35 | |
43b2e5d8 | 36 | #include "md.h" |
ef740c37 | 37 | #include "raid1.h" |
935fe098 | 38 | #include "md-bitmap.h" |
191ea9b2 | 39 | |
394ed8e4 SL |
40 | #define UNSUPPORTED_MDDEV_FLAGS \ |
41 | ((1L << MD_HAS_JOURNAL) | \ | |
ea0213e0 | 42 | (1L << MD_JOURNAL_CLEAN) | \ |
ddc08823 PB |
43 | (1L << MD_HAS_PPL) | \ |
44 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 45 | |
fd76863e | 46 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr); |
47 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr); | |
1da177e4 | 48 | |
578b54ad N |
49 | #define raid1_log(md, fmt, args...) \ |
50 | do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) | |
51 | ||
fb0eb5df ML |
52 | #include "raid1-10.c" |
53 | ||
69b00b5b GJ |
54 | #define START(node) ((node)->start) |
55 | #define LAST(node) ((node)->last) | |
56 | INTERVAL_TREE_DEFINE(struct serial_info, node, sector_t, _subtree_last, | |
57 | START, LAST, static inline, raid1_rb); | |
58 | ||
d0d2d8ba GJ |
59 | static int check_and_add_serial(struct md_rdev *rdev, struct r1bio *r1_bio, |
60 | struct serial_info *si, int idx) | |
3e148a32 | 61 | { |
3e148a32 GJ |
62 | unsigned long flags; |
63 | int ret = 0; | |
d0d2d8ba GJ |
64 | sector_t lo = r1_bio->sector; |
65 | sector_t hi = lo + r1_bio->sectors; | |
025471f9 | 66 | struct serial_in_rdev *serial = &rdev->serial[idx]; |
3e148a32 | 67 | |
69b00b5b GJ |
68 | spin_lock_irqsave(&serial->serial_lock, flags); |
69 | /* collision happened */ | |
70 | if (raid1_rb_iter_first(&serial->serial_rb, lo, hi)) | |
71 | ret = -EBUSY; | |
d0d2d8ba | 72 | else { |
69b00b5b GJ |
73 | si->start = lo; |
74 | si->last = hi; | |
75 | raid1_rb_insert(si, &serial->serial_rb); | |
d0d2d8ba | 76 | } |
69b00b5b | 77 | spin_unlock_irqrestore(&serial->serial_lock, flags); |
3e148a32 GJ |
78 | |
79 | return ret; | |
80 | } | |
81 | ||
d0d2d8ba GJ |
82 | static void wait_for_serialization(struct md_rdev *rdev, struct r1bio *r1_bio) |
83 | { | |
84 | struct mddev *mddev = rdev->mddev; | |
85 | struct serial_info *si; | |
86 | int idx = sector_to_idx(r1_bio->sector); | |
87 | struct serial_in_rdev *serial = &rdev->serial[idx]; | |
88 | ||
89 | if (WARN_ON(!mddev->serial_info_pool)) | |
90 | return; | |
91 | si = mempool_alloc(mddev->serial_info_pool, GFP_NOIO); | |
92 | wait_event(serial->serial_io_wait, | |
93 | check_and_add_serial(rdev, r1_bio, si, idx) == 0); | |
94 | } | |
95 | ||
404659cf | 96 | static void remove_serial(struct md_rdev *rdev, sector_t lo, sector_t hi) |
3e148a32 | 97 | { |
69b00b5b | 98 | struct serial_info *si; |
3e148a32 GJ |
99 | unsigned long flags; |
100 | int found = 0; | |
101 | struct mddev *mddev = rdev->mddev; | |
025471f9 GJ |
102 | int idx = sector_to_idx(lo); |
103 | struct serial_in_rdev *serial = &rdev->serial[idx]; | |
69b00b5b GJ |
104 | |
105 | spin_lock_irqsave(&serial->serial_lock, flags); | |
106 | for (si = raid1_rb_iter_first(&serial->serial_rb, lo, hi); | |
107 | si; si = raid1_rb_iter_next(si, lo, hi)) { | |
108 | if (si->start == lo && si->last == hi) { | |
109 | raid1_rb_remove(si, &serial->serial_rb); | |
110 | mempool_free(si, mddev->serial_info_pool); | |
3e148a32 GJ |
111 | found = 1; |
112 | break; | |
113 | } | |
69b00b5b | 114 | } |
3e148a32 | 115 | if (!found) |
404659cf | 116 | WARN(1, "The write IO is not recorded for serialization\n"); |
69b00b5b GJ |
117 | spin_unlock_irqrestore(&serial->serial_lock, flags); |
118 | wake_up(&serial->serial_io_wait); | |
3e148a32 GJ |
119 | } |
120 | ||
98d30c58 ML |
121 | /* |
122 | * for resync bio, r1bio pointer can be retrieved from the per-bio | |
123 | * 'struct resync_pages'. | |
124 | */ | |
125 | static inline struct r1bio *get_resync_r1bio(struct bio *bio) | |
126 | { | |
127 | return get_resync_pages(bio)->raid_bio; | |
128 | } | |
129 | ||
dd0fc66f | 130 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
131 | { |
132 | struct pool_info *pi = data; | |
9f2c9d12 | 133 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
134 | |
135 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 136 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
137 | } |
138 | ||
8e005f7c | 139 | #define RESYNC_DEPTH 32 |
1da177e4 | 140 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
8e005f7c | 141 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
142 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
c40f341f GR |
143 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
144 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
1da177e4 | 145 | |
dd0fc66f | 146 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
147 | { |
148 | struct pool_info *pi = data; | |
9f2c9d12 | 149 | struct r1bio *r1_bio; |
1da177e4 | 150 | struct bio *bio; |
da1aab3d | 151 | int need_pages; |
98d30c58 ML |
152 | int j; |
153 | struct resync_pages *rps; | |
1da177e4 LT |
154 | |
155 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 156 | if (!r1_bio) |
1da177e4 | 157 | return NULL; |
1da177e4 | 158 | |
6da2ec56 KC |
159 | rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), |
160 | gfp_flags); | |
98d30c58 ML |
161 | if (!rps) |
162 | goto out_free_r1bio; | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * Allocate bios : 1 for reading, n-1 for writing | |
166 | */ | |
167 | for (j = pi->raid_disks ; j-- ; ) { | |
066ff571 | 168 | bio = bio_kmalloc(RESYNC_PAGES, gfp_flags); |
1da177e4 LT |
169 | if (!bio) |
170 | goto out_free_bio; | |
066ff571 | 171 | bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0); |
1da177e4 LT |
172 | r1_bio->bios[j] = bio; |
173 | } | |
174 | /* | |
175 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
176 | * the first bio. |
177 | * If this is a user-requested check/repair, allocate | |
178 | * RESYNC_PAGES for each bio. | |
1da177e4 | 179 | */ |
d11c171e | 180 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 181 | need_pages = pi->raid_disks; |
d11c171e | 182 | else |
da1aab3d | 183 | need_pages = 1; |
98d30c58 ML |
184 | for (j = 0; j < pi->raid_disks; j++) { |
185 | struct resync_pages *rp = &rps[j]; | |
186 | ||
d11c171e | 187 | bio = r1_bio->bios[j]; |
d11c171e | 188 | |
98d30c58 ML |
189 | if (j < need_pages) { |
190 | if (resync_alloc_pages(rp, gfp_flags)) | |
191 | goto out_free_pages; | |
192 | } else { | |
193 | memcpy(rp, &rps[0], sizeof(*rp)); | |
194 | resync_get_all_pages(rp); | |
195 | } | |
196 | ||
98d30c58 ML |
197 | rp->raid_bio = r1_bio; |
198 | bio->bi_private = rp; | |
1da177e4 LT |
199 | } |
200 | ||
201 | r1_bio->master_bio = NULL; | |
202 | ||
203 | return r1_bio; | |
204 | ||
da1aab3d | 205 | out_free_pages: |
491221f8 | 206 | while (--j >= 0) |
98d30c58 | 207 | resync_free_pages(&rps[j]); |
da1aab3d | 208 | |
1da177e4 | 209 | out_free_bio: |
066ff571 CH |
210 | while (++j < pi->raid_disks) { |
211 | bio_uninit(r1_bio->bios[j]); | |
212 | kfree(r1_bio->bios[j]); | |
213 | } | |
98d30c58 ML |
214 | kfree(rps); |
215 | ||
216 | out_free_r1bio: | |
c7afa803 | 217 | rbio_pool_free(r1_bio, data); |
1da177e4 LT |
218 | return NULL; |
219 | } | |
220 | ||
221 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
222 | { | |
223 | struct pool_info *pi = data; | |
98d30c58 | 224 | int i; |
9f2c9d12 | 225 | struct r1bio *r1bio = __r1_bio; |
98d30c58 | 226 | struct resync_pages *rp = NULL; |
1da177e4 | 227 | |
98d30c58 ML |
228 | for (i = pi->raid_disks; i--; ) { |
229 | rp = get_resync_pages(r1bio->bios[i]); | |
230 | resync_free_pages(rp); | |
066ff571 CH |
231 | bio_uninit(r1bio->bios[i]); |
232 | kfree(r1bio->bios[i]); | |
98d30c58 ML |
233 | } |
234 | ||
235 | /* resync pages array stored in the 1st bio's .bi_private */ | |
236 | kfree(rp); | |
1da177e4 | 237 | |
c7afa803 | 238 | rbio_pool_free(r1bio, data); |
1da177e4 LT |
239 | } |
240 | ||
e8096360 | 241 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
242 | { |
243 | int i; | |
244 | ||
8f19ccb2 | 245 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 246 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 247 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
248 | bio_put(*bio); |
249 | *bio = NULL; | |
250 | } | |
251 | } | |
252 | ||
9f2c9d12 | 253 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 254 | { |
e8096360 | 255 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 256 | |
1da177e4 | 257 | put_all_bios(conf, r1_bio); |
afeee514 | 258 | mempool_free(r1_bio, &conf->r1bio_pool); |
1da177e4 LT |
259 | } |
260 | ||
9f2c9d12 | 261 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 262 | { |
e8096360 | 263 | struct r1conf *conf = r1_bio->mddev->private; |
af5f42a7 | 264 | sector_t sect = r1_bio->sector; |
3e198f78 N |
265 | int i; |
266 | ||
8f19ccb2 | 267 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
268 | struct bio *bio = r1_bio->bios[i]; |
269 | if (bio->bi_end_io) | |
270 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
271 | } | |
1da177e4 | 272 | |
afeee514 | 273 | mempool_free(r1_bio, &conf->r1buf_pool); |
1da177e4 | 274 | |
af5f42a7 | 275 | lower_barrier(conf, sect); |
1da177e4 LT |
276 | } |
277 | ||
9f2c9d12 | 278 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
279 | { |
280 | unsigned long flags; | |
fd01b88c | 281 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 282 | struct r1conf *conf = mddev->private; |
fd76863e | 283 | int idx; |
1da177e4 | 284 | |
fd76863e | 285 | idx = sector_to_idx(r1_bio->sector); |
1da177e4 LT |
286 | spin_lock_irqsave(&conf->device_lock, flags); |
287 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
824e47da | 288 | atomic_inc(&conf->nr_queued[idx]); |
1da177e4 LT |
289 | spin_unlock_irqrestore(&conf->device_lock, flags); |
290 | ||
17999be4 | 291 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
292 | md_wakeup_thread(mddev->thread); |
293 | } | |
294 | ||
295 | /* | |
296 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
297 | * operation and are ready to return a success/failure code to the buffer | |
298 | * cache layer. | |
299 | */ | |
9f2c9d12 | 300 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
301 | { |
302 | struct bio *bio = r1_bio->master_bio; | |
d2eb35ac N |
303 | |
304 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4e4cbee9 | 305 | bio->bi_status = BLK_STS_IOERR; |
4246a0b6 | 306 | |
a0159832 GJ |
307 | if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
308 | bio_end_io_acct(bio, r1_bio->start_time); | |
37011e3a | 309 | bio_endio(bio); |
d2eb35ac N |
310 | } |
311 | ||
9f2c9d12 | 312 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
313 | { |
314 | struct bio *bio = r1_bio->master_bio; | |
c91114c2 | 315 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 316 | |
4b6d287f N |
317 | /* if nobody has done the final endio yet, do it now */ |
318 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
319 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
320 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
321 | (unsigned long long) bio->bi_iter.bi_sector, |
322 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 323 | |
d2eb35ac | 324 | call_bio_endio(r1_bio); |
4b6d287f | 325 | } |
c91114c2 DJ |
326 | /* |
327 | * Wake up any possible resync thread that waits for the device | |
328 | * to go idle. All I/Os, even write-behind writes, are done. | |
329 | */ | |
330 | allow_barrier(conf, r1_bio->sector); | |
331 | ||
1da177e4 LT |
332 | free_r1bio(r1_bio); |
333 | } | |
334 | ||
335 | /* | |
336 | * Update disk head position estimator based on IRQ completion info. | |
337 | */ | |
9f2c9d12 | 338 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 339 | { |
e8096360 | 340 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
341 | |
342 | conf->mirrors[disk].head_position = | |
343 | r1_bio->sector + (r1_bio->sectors); | |
344 | } | |
345 | ||
ba3ae3be NK |
346 | /* |
347 | * Find the disk number which triggered given bio | |
348 | */ | |
9f2c9d12 | 349 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
350 | { |
351 | int mirror; | |
30194636 N |
352 | struct r1conf *conf = r1_bio->mddev->private; |
353 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 354 | |
8f19ccb2 | 355 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
356 | if (r1_bio->bios[mirror] == bio) |
357 | break; | |
358 | ||
8f19ccb2 | 359 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
360 | update_head_pos(mirror, r1_bio); |
361 | ||
362 | return mirror; | |
363 | } | |
364 | ||
4246a0b6 | 365 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 366 | { |
4e4cbee9 | 367 | int uptodate = !bio->bi_status; |
9f2c9d12 | 368 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 369 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 370 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 371 | |
1da177e4 LT |
372 | /* |
373 | * this branch is our 'one mirror IO has finished' event handler: | |
374 | */ | |
e5872d58 | 375 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 376 | |
dd00a99e N |
377 | if (uptodate) |
378 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
379 | else if (test_bit(FailFast, &rdev->flags) && |
380 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
381 | /* This was a fail-fast read so we definitely | |
382 | * want to retry */ | |
383 | ; | |
dd00a99e N |
384 | else { |
385 | /* If all other devices have failed, we want to return | |
386 | * the error upwards rather than fail the last device. | |
387 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 388 | */ |
dd00a99e N |
389 | unsigned long flags; |
390 | spin_lock_irqsave(&conf->device_lock, flags); | |
391 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
392 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 393 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
394 | uptodate = 1; |
395 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
396 | } | |
1da177e4 | 397 | |
7ad4d4a6 | 398 | if (uptodate) { |
1da177e4 | 399 | raid_end_bio_io(r1_bio); |
e5872d58 | 400 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 401 | } else { |
1da177e4 LT |
402 | /* |
403 | * oops, read error: | |
404 | */ | |
913cce5a | 405 | pr_err_ratelimited("md/raid1:%s: %pg: rescheduling sector %llu\n", |
1d41c216 | 406 | mdname(conf->mddev), |
913cce5a | 407 | rdev->bdev, |
1d41c216 | 408 | (unsigned long long)r1_bio->sector); |
d2eb35ac | 409 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 410 | reschedule_retry(r1_bio); |
7ad4d4a6 | 411 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 412 | } |
1da177e4 LT |
413 | } |
414 | ||
9f2c9d12 | 415 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
416 | { |
417 | /* it really is the end of this request */ | |
418 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
419 | bio_free_pages(r1_bio->behind_master_bio); |
420 | bio_put(r1_bio->behind_master_bio); | |
421 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
422 | } |
423 | /* clear the bitmap if all writes complete successfully */ | |
e64e4018 AS |
424 | md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
425 | r1_bio->sectors, | |
426 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
427 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
cd5ff9a1 N |
428 | md_write_end(r1_bio->mddev); |
429 | } | |
430 | ||
9f2c9d12 | 431 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 432 | { |
cd5ff9a1 N |
433 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
434 | return; | |
435 | ||
436 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
437 | reschedule_retry(r1_bio); | |
438 | else { | |
439 | close_write(r1_bio); | |
4367af55 N |
440 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
441 | reschedule_retry(r1_bio); | |
442 | else | |
443 | raid_end_bio_io(r1_bio); | |
4e78064f N |
444 | } |
445 | } | |
446 | ||
4246a0b6 | 447 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 448 | { |
9f2c9d12 | 449 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 450 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 451 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 452 | struct bio *to_put = NULL; |
e5872d58 N |
453 | int mirror = find_bio_disk(r1_bio, bio); |
454 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd | 455 | bool discard_error; |
69df9cfc GJ |
456 | sector_t lo = r1_bio->sector; |
457 | sector_t hi = r1_bio->sector + r1_bio->sectors; | |
e3f948cd | 458 | |
4e4cbee9 | 459 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 460 | |
e9c7469b TH |
461 | /* |
462 | * 'one mirror IO has finished' event handler: | |
463 | */ | |
4e4cbee9 | 464 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
465 | set_bit(WriteErrorSeen, &rdev->flags); |
466 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
467 | set_bit(MD_RECOVERY_NEEDED, & |
468 | conf->mddev->recovery); | |
469 | ||
212e7eb7 N |
470 | if (test_bit(FailFast, &rdev->flags) && |
471 | (bio->bi_opf & MD_FAILFAST) && | |
472 | /* We never try FailFast to WriteMostly devices */ | |
473 | !test_bit(WriteMostly, &rdev->flags)) { | |
474 | md_error(r1_bio->mddev, rdev); | |
eeba6809 YY |
475 | } |
476 | ||
477 | /* | |
478 | * When the device is faulty, it is not necessary to | |
479 | * handle write error. | |
eeba6809 YY |
480 | */ |
481 | if (!test_bit(Faulty, &rdev->flags)) | |
212e7eb7 | 482 | set_bit(R1BIO_WriteError, &r1_bio->state); |
eeba6809 | 483 | else { |
2417b986 PC |
484 | /* Fail the request */ |
485 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
eeba6809 YY |
486 | /* Finished with this branch */ |
487 | r1_bio->bios[mirror] = NULL; | |
488 | to_put = bio; | |
489 | } | |
4367af55 | 490 | } else { |
1da177e4 | 491 | /* |
e9c7469b TH |
492 | * Set R1BIO_Uptodate in our master bio, so that we |
493 | * will return a good error code for to the higher | |
494 | * levels even if IO on some other mirrored buffer | |
495 | * fails. | |
496 | * | |
497 | * The 'master' represents the composite IO operation | |
498 | * to user-side. So if something waits for IO, then it | |
499 | * will wait for the 'master' bio. | |
1da177e4 | 500 | */ |
4367af55 N |
501 | sector_t first_bad; |
502 | int bad_sectors; | |
503 | ||
cd5ff9a1 N |
504 | r1_bio->bios[mirror] = NULL; |
505 | to_put = bio; | |
3056e3ae AL |
506 | /* |
507 | * Do not set R1BIO_Uptodate if the current device is | |
508 | * rebuilding or Faulty. This is because we cannot use | |
509 | * such device for properly reading the data back (we could | |
510 | * potentially use it, if the current write would have felt | |
511 | * before rdev->recovery_offset, but for simplicity we don't | |
512 | * check this here. | |
513 | */ | |
e5872d58 N |
514 | if (test_bit(In_sync, &rdev->flags) && |
515 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 516 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 517 | |
4367af55 | 518 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 519 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 520 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
521 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
522 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
523 | } | |
524 | } | |
525 | ||
e9c7469b | 526 | if (behind) { |
69df9cfc | 527 | if (test_bit(CollisionCheck, &rdev->flags)) |
404659cf | 528 | remove_serial(rdev, lo, hi); |
e5872d58 | 529 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
530 | atomic_dec(&r1_bio->behind_remaining); |
531 | ||
532 | /* | |
533 | * In behind mode, we ACK the master bio once the I/O | |
534 | * has safely reached all non-writemostly | |
535 | * disks. Setting the Returned bit ensures that this | |
536 | * gets done only once -- we don't ever want to return | |
537 | * -EIO here, instead we'll wait | |
538 | */ | |
539 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
540 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
541 | /* Maybe we can return now */ | |
542 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
543 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
544 | pr_debug("raid1: behind end write sectors" |
545 | " %llu-%llu\n", | |
4f024f37 KO |
546 | (unsigned long long) mbio->bi_iter.bi_sector, |
547 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 548 | call_bio_endio(r1_bio); |
4b6d287f N |
549 | } |
550 | } | |
69df9cfc GJ |
551 | } else if (rdev->mddev->serialize_policy) |
552 | remove_serial(rdev, lo, hi); | |
4367af55 | 553 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 554 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 555 | |
1da177e4 | 556 | /* |
1da177e4 LT |
557 | * Let's see if all mirrored write operations have finished |
558 | * already. | |
559 | */ | |
af6d7b76 | 560 | r1_bio_write_done(r1_bio); |
c70810b3 | 561 | |
04b857f7 N |
562 | if (to_put) |
563 | bio_put(to_put); | |
1da177e4 LT |
564 | } |
565 | ||
fd76863e | 566 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
567 | sector_t sectors) | |
568 | { | |
569 | sector_t len; | |
570 | ||
571 | WARN_ON(sectors == 0); | |
572 | /* | |
573 | * len is the number of sectors from start_sector to end of the | |
574 | * barrier unit which start_sector belongs to. | |
575 | */ | |
576 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
577 | start_sector; | |
578 | ||
579 | if (len > sectors) | |
580 | len = sectors; | |
581 | ||
582 | return len; | |
583 | } | |
584 | ||
1da177e4 LT |
585 | /* |
586 | * This routine returns the disk from which the requested read should | |
587 | * be done. There is a per-array 'next expected sequential IO' sector | |
588 | * number - if this matches on the next IO then we use the last disk. | |
589 | * There is also a per-disk 'last know head position' sector that is | |
590 | * maintained from IRQ contexts, both the normal and the resync IO | |
591 | * completion handlers update this position correctly. If there is no | |
592 | * perfect sequential match then we pick the disk whose head is closest. | |
593 | * | |
594 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
595 | * because position is mirror, not device based. | |
596 | * | |
597 | * The rdev for the device selected will have nr_pending incremented. | |
598 | */ | |
e8096360 | 599 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 600 | { |
af3a2cd6 | 601 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
602 | int sectors; |
603 | int best_good_sectors; | |
9dedf603 SL |
604 | int best_disk, best_dist_disk, best_pending_disk; |
605 | int has_nonrot_disk; | |
be4d3280 | 606 | int disk; |
76073054 | 607 | sector_t best_dist; |
9dedf603 | 608 | unsigned int min_pending; |
3cb03002 | 609 | struct md_rdev *rdev; |
f3ac8bf7 | 610 | int choose_first; |
12cee5a8 | 611 | int choose_next_idle; |
1da177e4 LT |
612 | |
613 | rcu_read_lock(); | |
614 | /* | |
8ddf9efe | 615 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
616 | * device if no resync is going on, or below the resync window. |
617 | * We take the first readable disk when above the resync window. | |
618 | */ | |
619 | retry: | |
d2eb35ac | 620 | sectors = r1_bio->sectors; |
76073054 | 621 | best_disk = -1; |
9dedf603 | 622 | best_dist_disk = -1; |
76073054 | 623 | best_dist = MaxSector; |
9dedf603 SL |
624 | best_pending_disk = -1; |
625 | min_pending = UINT_MAX; | |
d2eb35ac | 626 | best_good_sectors = 0; |
9dedf603 | 627 | has_nonrot_disk = 0; |
12cee5a8 | 628 | choose_next_idle = 0; |
2e52d449 | 629 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 630 | |
7d49ffcf GR |
631 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
632 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 633 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
634 | this_sector + sectors))) |
635 | choose_first = 1; | |
636 | else | |
637 | choose_first = 0; | |
1da177e4 | 638 | |
be4d3280 | 639 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 640 | sector_t dist; |
d2eb35ac N |
641 | sector_t first_bad; |
642 | int bad_sectors; | |
9dedf603 | 643 | unsigned int pending; |
12cee5a8 | 644 | bool nonrot; |
d2eb35ac | 645 | |
f3ac8bf7 N |
646 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
647 | if (r1_bio->bios[disk] == IO_BLOCKED | |
648 | || rdev == NULL | |
76073054 | 649 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 650 | continue; |
76073054 N |
651 | if (!test_bit(In_sync, &rdev->flags) && |
652 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 653 | continue; |
76073054 N |
654 | if (test_bit(WriteMostly, &rdev->flags)) { |
655 | /* Don't balance among write-mostly, just | |
656 | * use the first as a last resort */ | |
d1901ef0 | 657 | if (best_dist_disk < 0) { |
307729c8 N |
658 | if (is_badblock(rdev, this_sector, sectors, |
659 | &first_bad, &bad_sectors)) { | |
816b0acf | 660 | if (first_bad <= this_sector) |
307729c8 N |
661 | /* Cannot use this */ |
662 | continue; | |
663 | best_good_sectors = first_bad - this_sector; | |
664 | } else | |
665 | best_good_sectors = sectors; | |
d1901ef0 TH |
666 | best_dist_disk = disk; |
667 | best_pending_disk = disk; | |
307729c8 | 668 | } |
76073054 N |
669 | continue; |
670 | } | |
671 | /* This is a reasonable device to use. It might | |
672 | * even be best. | |
673 | */ | |
d2eb35ac N |
674 | if (is_badblock(rdev, this_sector, sectors, |
675 | &first_bad, &bad_sectors)) { | |
676 | if (best_dist < MaxSector) | |
677 | /* already have a better device */ | |
678 | continue; | |
679 | if (first_bad <= this_sector) { | |
680 | /* cannot read here. If this is the 'primary' | |
681 | * device, then we must not read beyond | |
682 | * bad_sectors from another device.. | |
683 | */ | |
684 | bad_sectors -= (this_sector - first_bad); | |
685 | if (choose_first && sectors > bad_sectors) | |
686 | sectors = bad_sectors; | |
687 | if (best_good_sectors > sectors) | |
688 | best_good_sectors = sectors; | |
689 | ||
690 | } else { | |
691 | sector_t good_sectors = first_bad - this_sector; | |
692 | if (good_sectors > best_good_sectors) { | |
693 | best_good_sectors = good_sectors; | |
694 | best_disk = disk; | |
695 | } | |
696 | if (choose_first) | |
697 | break; | |
698 | } | |
699 | continue; | |
d82dd0e3 TM |
700 | } else { |
701 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
702 | best_disk = -1; | |
d2eb35ac | 703 | best_good_sectors = sectors; |
d82dd0e3 | 704 | } |
d2eb35ac | 705 | |
2e52d449 N |
706 | if (best_disk >= 0) |
707 | /* At least two disks to choose from so failfast is OK */ | |
708 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
709 | ||
10f0d2a5 | 710 | nonrot = bdev_nonrot(rdev->bdev); |
12cee5a8 | 711 | has_nonrot_disk |= nonrot; |
9dedf603 | 712 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 713 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 714 | if (choose_first) { |
76073054 | 715 | best_disk = disk; |
1da177e4 LT |
716 | break; |
717 | } | |
12cee5a8 SL |
718 | /* Don't change to another disk for sequential reads */ |
719 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
720 | || dist == 0) { | |
721 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
722 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
723 | ||
724 | best_disk = disk; | |
725 | /* | |
726 | * If buffered sequential IO size exceeds optimal | |
727 | * iosize, check if there is idle disk. If yes, choose | |
728 | * the idle disk. read_balance could already choose an | |
729 | * idle disk before noticing it's a sequential IO in | |
730 | * this disk. This doesn't matter because this disk | |
731 | * will idle, next time it will be utilized after the | |
732 | * first disk has IO size exceeds optimal iosize. In | |
733 | * this way, iosize of the first disk will be optimal | |
734 | * iosize at least. iosize of the second disk might be | |
735 | * small, but not a big deal since when the second disk | |
736 | * starts IO, the first disk is likely still busy. | |
737 | */ | |
738 | if (nonrot && opt_iosize > 0 && | |
739 | mirror->seq_start != MaxSector && | |
740 | mirror->next_seq_sect > opt_iosize && | |
741 | mirror->next_seq_sect - opt_iosize >= | |
742 | mirror->seq_start) { | |
743 | choose_next_idle = 1; | |
744 | continue; | |
745 | } | |
746 | break; | |
747 | } | |
12cee5a8 SL |
748 | |
749 | if (choose_next_idle) | |
750 | continue; | |
9dedf603 SL |
751 | |
752 | if (min_pending > pending) { | |
753 | min_pending = pending; | |
754 | best_pending_disk = disk; | |
755 | } | |
756 | ||
76073054 N |
757 | if (dist < best_dist) { |
758 | best_dist = dist; | |
9dedf603 | 759 | best_dist_disk = disk; |
1da177e4 | 760 | } |
f3ac8bf7 | 761 | } |
1da177e4 | 762 | |
9dedf603 SL |
763 | /* |
764 | * If all disks are rotational, choose the closest disk. If any disk is | |
765 | * non-rotational, choose the disk with less pending request even the | |
766 | * disk is rotational, which might/might not be optimal for raids with | |
767 | * mixed ratation/non-rotational disks depending on workload. | |
768 | */ | |
769 | if (best_disk == -1) { | |
2e52d449 | 770 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
771 | best_disk = best_pending_disk; |
772 | else | |
773 | best_disk = best_dist_disk; | |
774 | } | |
775 | ||
76073054 N |
776 | if (best_disk >= 0) { |
777 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
778 | if (!rdev) |
779 | goto retry; | |
780 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 781 | sectors = best_good_sectors; |
12cee5a8 SL |
782 | |
783 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
784 | conf->mirrors[best_disk].seq_start = this_sector; | |
785 | ||
be4d3280 | 786 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
787 | } |
788 | rcu_read_unlock(); | |
d2eb35ac | 789 | *max_sectors = sectors; |
1da177e4 | 790 | |
76073054 | 791 | return best_disk; |
1da177e4 LT |
792 | } |
793 | ||
673ca68d N |
794 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
795 | { | |
796 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
e64e4018 | 797 | md_bitmap_unplug(conf->mddev->bitmap); |
673ca68d N |
798 | wake_up(&conf->wait_barrier); |
799 | ||
800 | while (bio) { /* submit pending writes */ | |
801 | struct bio *next = bio->bi_next; | |
309dca30 | 802 | struct md_rdev *rdev = (void *)bio->bi_bdev; |
673ca68d | 803 | bio->bi_next = NULL; |
74d46992 | 804 | bio_set_dev(bio, rdev->bdev); |
673ca68d | 805 | if (test_bit(Faulty, &rdev->flags)) { |
6308d8e3 | 806 | bio_io_error(bio); |
673ca68d | 807 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
70200574 | 808 | !bdev_max_discard_sectors(bio->bi_bdev))) |
673ca68d N |
809 | /* Just ignore it */ |
810 | bio_endio(bio); | |
811 | else | |
ed00aabd | 812 | submit_bio_noacct(bio); |
673ca68d | 813 | bio = next; |
5fa4f8ba | 814 | cond_resched(); |
673ca68d N |
815 | } |
816 | } | |
817 | ||
e8096360 | 818 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
819 | { |
820 | /* Any writes that have been queued but are awaiting | |
821 | * bitmap updates get flushed here. | |
a35e63ef | 822 | */ |
a35e63ef N |
823 | spin_lock_irq(&conf->device_lock); |
824 | ||
825 | if (conf->pending_bio_list.head) { | |
18022a1b | 826 | struct blk_plug plug; |
a35e63ef | 827 | struct bio *bio; |
18022a1b | 828 | |
a35e63ef | 829 | bio = bio_list_get(&conf->pending_bio_list); |
a35e63ef | 830 | spin_unlock_irq(&conf->device_lock); |
474beb57 N |
831 | |
832 | /* | |
833 | * As this is called in a wait_event() loop (see freeze_array), | |
834 | * current->state might be TASK_UNINTERRUPTIBLE which will | |
835 | * cause a warning when we prepare to wait again. As it is | |
836 | * rare that this path is taken, it is perfectly safe to force | |
837 | * us to go around the wait_event() loop again, so the warning | |
838 | * is a false-positive. Silence the warning by resetting | |
839 | * thread state | |
840 | */ | |
841 | __set_current_state(TASK_RUNNING); | |
18022a1b | 842 | blk_start_plug(&plug); |
673ca68d | 843 | flush_bio_list(conf, bio); |
18022a1b | 844 | blk_finish_plug(&plug); |
a35e63ef N |
845 | } else |
846 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
847 | } |
848 | ||
17999be4 N |
849 | /* Barriers.... |
850 | * Sometimes we need to suspend IO while we do something else, | |
851 | * either some resync/recovery, or reconfigure the array. | |
852 | * To do this we raise a 'barrier'. | |
853 | * The 'barrier' is a counter that can be raised multiple times | |
854 | * to count how many activities are happening which preclude | |
855 | * normal IO. | |
856 | * We can only raise the barrier if there is no pending IO. | |
857 | * i.e. if nr_pending == 0. | |
858 | * We choose only to raise the barrier if no-one is waiting for the | |
859 | * barrier to go down. This means that as soon as an IO request | |
860 | * is ready, no other operations which require a barrier will start | |
861 | * until the IO request has had a chance. | |
862 | * | |
863 | * So: regular IO calls 'wait_barrier'. When that returns there | |
864 | * is no backgroup IO happening, It must arrange to call | |
865 | * allow_barrier when it has finished its IO. | |
866 | * backgroup IO calls must call raise_barrier. Once that returns | |
867 | * there is no normal IO happeing. It must arrange to call | |
868 | * lower_barrier when the particular background IO completes. | |
4675719d HT |
869 | * |
870 | * If resync/recovery is interrupted, returns -EINTR; | |
871 | * Otherwise, returns 0. | |
1da177e4 | 872 | */ |
4675719d | 873 | static int raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 874 | { |
fd76863e | 875 | int idx = sector_to_idx(sector_nr); |
876 | ||
1da177e4 | 877 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
878 | |
879 | /* Wait until no block IO is waiting */ | |
824e47da | 880 | wait_event_lock_irq(conf->wait_barrier, |
881 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 882 | conf->resync_lock); |
17999be4 N |
883 | |
884 | /* block any new IO from starting */ | |
824e47da | 885 | atomic_inc(&conf->barrier[idx]); |
886 | /* | |
887 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
888 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
889 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
890 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
891 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
892 | * there will be a race between raise_barrier() and _wait_barrier(). | |
893 | */ | |
894 | smp_mb__after_atomic(); | |
17999be4 | 895 | |
79ef3a8a | 896 | /* For these conditions we must wait: |
897 | * A: while the array is in frozen state | |
fd76863e | 898 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
899 | * existing in corresponding I/O barrier bucket. | |
900 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
901 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 902 | */ |
17999be4 | 903 | wait_event_lock_irq(conf->wait_barrier, |
8c242593 | 904 | (!conf->array_frozen && |
824e47da | 905 | !atomic_read(&conf->nr_pending[idx]) && |
8c242593 YY |
906 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || |
907 | test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), | |
eed8c02e | 908 | conf->resync_lock); |
17999be4 | 909 | |
8c242593 YY |
910 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
911 | atomic_dec(&conf->barrier[idx]); | |
912 | spin_unlock_irq(&conf->resync_lock); | |
913 | wake_up(&conf->wait_barrier); | |
914 | return -EINTR; | |
915 | } | |
916 | ||
43ac9b84 | 917 | atomic_inc(&conf->nr_sync_pending); |
17999be4 | 918 | spin_unlock_irq(&conf->resync_lock); |
8c242593 YY |
919 | |
920 | return 0; | |
17999be4 N |
921 | } |
922 | ||
fd76863e | 923 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 924 | { |
fd76863e | 925 | int idx = sector_to_idx(sector_nr); |
926 | ||
824e47da | 927 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 928 | |
824e47da | 929 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 930 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
931 | wake_up(&conf->wait_barrier); |
932 | } | |
933 | ||
5aa70503 | 934 | static bool _wait_barrier(struct r1conf *conf, int idx, bool nowait) |
17999be4 | 935 | { |
5aa70503 VV |
936 | bool ret = true; |
937 | ||
824e47da | 938 | /* |
939 | * We need to increase conf->nr_pending[idx] very early here, | |
940 | * then raise_barrier() can be blocked when it waits for | |
941 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
942 | * conf->resync_lock when there is no barrier raised in same | |
943 | * barrier unit bucket. Also if the array is frozen, I/O | |
944 | * should be blocked until array is unfrozen. | |
945 | */ | |
946 | atomic_inc(&conf->nr_pending[idx]); | |
947 | /* | |
948 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
949 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
950 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
951 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
952 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
953 | * will be a race between _wait_barrier() and raise_barrier(). | |
954 | */ | |
955 | smp_mb__after_atomic(); | |
79ef3a8a | 956 | |
824e47da | 957 | /* |
958 | * Don't worry about checking two atomic_t variables at same time | |
959 | * here. If during we check conf->barrier[idx], the array is | |
960 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
961 | * 0, it is safe to return and make the I/O continue. Because the | |
962 | * array is frozen, all I/O returned here will eventually complete | |
963 | * or be queued, no race will happen. See code comment in | |
964 | * frozen_array(). | |
965 | */ | |
966 | if (!READ_ONCE(conf->array_frozen) && | |
967 | !atomic_read(&conf->barrier[idx])) | |
5aa70503 | 968 | return ret; |
79ef3a8a | 969 | |
824e47da | 970 | /* |
971 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
972 | * should be decreased before waiting for barrier to drop. | |
973 | * Otherwise, we may encounter a race condition because | |
974 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
975 | * to be 0 at same time. | |
976 | */ | |
977 | spin_lock_irq(&conf->resync_lock); | |
978 | atomic_inc(&conf->nr_waiting[idx]); | |
979 | atomic_dec(&conf->nr_pending[idx]); | |
980 | /* | |
981 | * In case freeze_array() is waiting for | |
982 | * get_unqueued_pending() == extra | |
983 | */ | |
984 | wake_up(&conf->wait_barrier); | |
985 | /* Wait for the barrier in same barrier unit bucket to drop. */ | |
5aa70503 VV |
986 | |
987 | /* Return false when nowait flag is set */ | |
988 | if (nowait) { | |
989 | ret = false; | |
990 | } else { | |
991 | wait_event_lock_irq(conf->wait_barrier, | |
992 | !conf->array_frozen && | |
993 | !atomic_read(&conf->barrier[idx]), | |
994 | conf->resync_lock); | |
995 | atomic_inc(&conf->nr_pending[idx]); | |
996 | } | |
997 | ||
824e47da | 998 | atomic_dec(&conf->nr_waiting[idx]); |
fd76863e | 999 | spin_unlock_irq(&conf->resync_lock); |
5aa70503 | 1000 | return ret; |
79ef3a8a | 1001 | } |
1002 | ||
5aa70503 | 1003 | static bool wait_read_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) |
79ef3a8a | 1004 | { |
fd76863e | 1005 | int idx = sector_to_idx(sector_nr); |
5aa70503 | 1006 | bool ret = true; |
79ef3a8a | 1007 | |
824e47da | 1008 | /* |
1009 | * Very similar to _wait_barrier(). The difference is, for read | |
1010 | * I/O we don't need wait for sync I/O, but if the whole array | |
1011 | * is frozen, the read I/O still has to wait until the array is | |
1012 | * unfrozen. Since there is no ordering requirement with | |
1013 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
1014 | */ | |
1015 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 1016 | |
824e47da | 1017 | if (!READ_ONCE(conf->array_frozen)) |
5aa70503 | 1018 | return ret; |
824e47da | 1019 | |
1020 | spin_lock_irq(&conf->resync_lock); | |
1021 | atomic_inc(&conf->nr_waiting[idx]); | |
1022 | atomic_dec(&conf->nr_pending[idx]); | |
1023 | /* | |
1024 | * In case freeze_array() is waiting for | |
1025 | * get_unqueued_pending() == extra | |
1026 | */ | |
1027 | wake_up(&conf->wait_barrier); | |
1028 | /* Wait for array to be unfrozen */ | |
5aa70503 VV |
1029 | |
1030 | /* Return false when nowait flag is set */ | |
1031 | if (nowait) { | |
1032 | /* Return false when nowait flag is set */ | |
1033 | ret = false; | |
1034 | } else { | |
1035 | wait_event_lock_irq(conf->wait_barrier, | |
1036 | !conf->array_frozen, | |
1037 | conf->resync_lock); | |
1038 | atomic_inc(&conf->nr_pending[idx]); | |
1039 | } | |
1040 | ||
824e47da | 1041 | atomic_dec(&conf->nr_waiting[idx]); |
1da177e4 | 1042 | spin_unlock_irq(&conf->resync_lock); |
5aa70503 | 1043 | return ret; |
1da177e4 LT |
1044 | } |
1045 | ||
5aa70503 | 1046 | static bool wait_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) |
17999be4 | 1047 | { |
fd76863e | 1048 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 1049 | |
5aa70503 | 1050 | return _wait_barrier(conf, idx, nowait); |
fd76863e | 1051 | } |
1052 | ||
fd76863e | 1053 | static void _allow_barrier(struct r1conf *conf, int idx) |
17999be4 | 1054 | { |
824e47da | 1055 | atomic_dec(&conf->nr_pending[idx]); |
17999be4 N |
1056 | wake_up(&conf->wait_barrier); |
1057 | } | |
1058 | ||
fd76863e | 1059 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
1060 | { | |
1061 | int idx = sector_to_idx(sector_nr); | |
1062 | ||
1063 | _allow_barrier(conf, idx); | |
1064 | } | |
1065 | ||
fd76863e | 1066 | /* conf->resync_lock should be held */ |
1067 | static int get_unqueued_pending(struct r1conf *conf) | |
1068 | { | |
1069 | int idx, ret; | |
1070 | ||
43ac9b84 XN |
1071 | ret = atomic_read(&conf->nr_sync_pending); |
1072 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1073 | ret += atomic_read(&conf->nr_pending[idx]) - |
1074 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1075 | |
1076 | return ret; | |
1077 | } | |
1078 | ||
e2d59925 | 1079 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1080 | { |
fd76863e | 1081 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1082 | * go quiet. |
fd76863e | 1083 | * This is called in two situations: |
1084 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1085 | * 2) one normal I/O request failed. | |
1086 | ||
1087 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1088 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1089 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1090 | * queued. When everything goes quite, there are only queued I/Os left. | |
1091 | ||
1092 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1093 | * barrier bucket index which this I/O request hits. When all sync and | |
1094 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1095 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1096 | * in handle_read_error(), we may call freeze_array() before trying to | |
1097 | * fix the read error. In this case, the error read I/O is not queued, | |
1098 | * so get_unqueued_pending() == 1. | |
1099 | * | |
1100 | * Therefore before this function returns, we need to wait until | |
1101 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1102 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1103 | */ |
1104 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1105 | conf->array_frozen = 1; |
578b54ad | 1106 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1107 | wait_event_lock_irq_cmd( |
1108 | conf->wait_barrier, | |
1109 | get_unqueued_pending(conf) == extra, | |
1110 | conf->resync_lock, | |
1111 | flush_pending_writes(conf)); | |
ddaf22ab N |
1112 | spin_unlock_irq(&conf->resync_lock); |
1113 | } | |
e8096360 | 1114 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1115 | { |
1116 | /* reverse the effect of the freeze */ | |
1117 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1118 | conf->array_frozen = 0; |
ddaf22ab | 1119 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1120 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1121 | } |
1122 | ||
16d56e2f | 1123 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1124 | struct bio *bio) |
4b6d287f | 1125 | { |
cb83efcf | 1126 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1127 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1128 | int i = 0; | |
1129 | struct bio *behind_bio = NULL; | |
1130 | ||
609be106 CH |
1131 | behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO, |
1132 | &r1_bio->mddev->bio_set); | |
841c1316 | 1133 | if (!behind_bio) |
16d56e2f | 1134 | return; |
4b6d287f | 1135 | |
41743c1f | 1136 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1137 | if (!bio_has_data(bio)) { |
1138 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1139 | goto skip_copy; |
16d56e2f | 1140 | } |
41743c1f | 1141 | |
841c1316 ML |
1142 | while (i < vcnt && size) { |
1143 | struct page *page; | |
1144 | int len = min_t(int, PAGE_SIZE, size); | |
1145 | ||
1146 | page = alloc_page(GFP_NOIO); | |
1147 | if (unlikely(!page)) | |
1148 | goto free_pages; | |
1149 | ||
1150 | bio_add_page(behind_bio, page, len, 0); | |
1151 | ||
1152 | size -= len; | |
1153 | i++; | |
4b6d287f | 1154 | } |
841c1316 | 1155 | |
cb83efcf | 1156 | bio_copy_data(behind_bio, bio); |
41743c1f | 1157 | skip_copy: |
56a64c17 | 1158 | r1_bio->behind_master_bio = behind_bio; |
af6d7b76 | 1159 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1160 | |
16d56e2f | 1161 | return; |
841c1316 ML |
1162 | |
1163 | free_pages: | |
4f024f37 KO |
1164 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1165 | bio->bi_iter.bi_size); | |
841c1316 | 1166 | bio_free_pages(behind_bio); |
16d56e2f | 1167 | bio_put(behind_bio); |
4b6d287f N |
1168 | } |
1169 | ||
f54a9d0e N |
1170 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) |
1171 | { | |
1172 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1173 | cb); | |
1174 | struct mddev *mddev = plug->cb.data; | |
1175 | struct r1conf *conf = mddev->private; | |
1176 | struct bio *bio; | |
1177 | ||
874807a8 | 1178 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1179 | spin_lock_irq(&conf->device_lock); |
1180 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
f54a9d0e | 1181 | spin_unlock_irq(&conf->device_lock); |
ee0b0244 | 1182 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1183 | md_wakeup_thread(mddev->thread); |
1184 | kfree(plug); | |
1185 | return; | |
1186 | } | |
1187 | ||
1188 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1189 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1190 | flush_bio_list(conf, bio); |
f54a9d0e N |
1191 | kfree(plug); |
1192 | } | |
1193 | ||
689389a0 N |
1194 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1195 | { | |
1196 | r1_bio->master_bio = bio; | |
1197 | r1_bio->sectors = bio_sectors(bio); | |
1198 | r1_bio->state = 0; | |
1199 | r1_bio->mddev = mddev; | |
1200 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1201 | } | |
1202 | ||
fd76863e | 1203 | static inline struct r1bio * |
689389a0 | 1204 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1205 | { |
1206 | struct r1conf *conf = mddev->private; | |
1207 | struct r1bio *r1_bio; | |
1208 | ||
afeee514 | 1209 | r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); |
689389a0 N |
1210 | /* Ensure no bio records IO_BLOCKED */ |
1211 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1212 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1213 | return r1_bio; |
1214 | } | |
1215 | ||
c230e7e5 | 1216 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1217 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1218 | { |
e8096360 | 1219 | struct r1conf *conf = mddev->private; |
0eaf822c | 1220 | struct raid1_info *mirror; |
1da177e4 | 1221 | struct bio *read_bio; |
3b046a97 | 1222 | struct bitmap *bitmap = mddev->bitmap; |
3c5e514d BVA |
1223 | const enum req_op op = bio_op(bio); |
1224 | const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC; | |
3b046a97 RL |
1225 | int max_sectors; |
1226 | int rdisk; | |
9b8ae7b9 | 1227 | bool r1bio_existed = !!r1_bio; |
689389a0 | 1228 | char b[BDEVNAME_SIZE]; |
3b046a97 | 1229 | |
fd76863e | 1230 | /* |
689389a0 N |
1231 | * If r1_bio is set, we are blocking the raid1d thread |
1232 | * so there is a tiny risk of deadlock. So ask for | |
1233 | * emergency memory if needed. | |
fd76863e | 1234 | */ |
689389a0 | 1235 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1236 | |
9b8ae7b9 | 1237 | if (r1bio_existed) { |
689389a0 N |
1238 | /* Need to get the block device name carefully */ |
1239 | struct md_rdev *rdev; | |
1240 | rcu_read_lock(); | |
1241 | rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); | |
1242 | if (rdev) | |
900d156b | 1243 | snprintf(b, sizeof(b), "%pg", rdev->bdev); |
689389a0 N |
1244 | else |
1245 | strcpy(b, "???"); | |
1246 | rcu_read_unlock(); | |
1247 | } | |
3b046a97 | 1248 | |
fd76863e | 1249 | /* |
fd76863e | 1250 | * Still need barrier for READ in case that whole |
1251 | * array is frozen. | |
fd76863e | 1252 | */ |
5aa70503 VV |
1253 | if (!wait_read_barrier(conf, bio->bi_iter.bi_sector, |
1254 | bio->bi_opf & REQ_NOWAIT)) { | |
1255 | bio_wouldblock_error(bio); | |
1256 | return; | |
1257 | } | |
fd76863e | 1258 | |
689389a0 N |
1259 | if (!r1_bio) |
1260 | r1_bio = alloc_r1bio(mddev, bio); | |
1261 | else | |
1262 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1263 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1264 | |
1265 | /* | |
1266 | * make_request() can abort the operation when read-ahead is being | |
1267 | * used and no empty request is available. | |
1268 | */ | |
3b046a97 RL |
1269 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1270 | ||
1271 | if (rdisk < 0) { | |
1272 | /* couldn't find anywhere to read from */ | |
9b8ae7b9 | 1273 | if (r1bio_existed) { |
689389a0 N |
1274 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
1275 | mdname(mddev), | |
1276 | b, | |
1277 | (unsigned long long)r1_bio->sector); | |
1278 | } | |
3b046a97 RL |
1279 | raid_end_bio_io(r1_bio); |
1280 | return; | |
1281 | } | |
1282 | mirror = conf->mirrors + rdisk; | |
1283 | ||
9b8ae7b9 | 1284 | if (r1bio_existed) |
913cce5a | 1285 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %pg\n", |
689389a0 N |
1286 | mdname(mddev), |
1287 | (unsigned long long)r1_bio->sector, | |
913cce5a | 1288 | mirror->rdev->bdev); |
689389a0 | 1289 | |
3b046a97 RL |
1290 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1291 | bitmap) { | |
1292 | /* | |
1293 | * Reading from a write-mostly device must take care not to | |
1294 | * over-take any writes that are 'behind' | |
1295 | */ | |
1296 | raid1_log(mddev, "wait behind writes"); | |
1297 | wait_event(bitmap->behind_wait, | |
1298 | atomic_read(&bitmap->behind_writes) == 0); | |
1299 | } | |
c230e7e5 N |
1300 | |
1301 | if (max_sectors < bio_sectors(bio)) { | |
1302 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1303 | gfp, &conf->bio_split); |
c230e7e5 | 1304 | bio_chain(split, bio); |
ed00aabd | 1305 | submit_bio_noacct(bio); |
c230e7e5 N |
1306 | bio = split; |
1307 | r1_bio->master_bio = bio; | |
1308 | r1_bio->sectors = max_sectors; | |
1309 | } | |
1310 | ||
3b046a97 | 1311 | r1_bio->read_disk = rdisk; |
3b046a97 | 1312 | |
a0159832 GJ |
1313 | if (!r1bio_existed && blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
1314 | r1_bio->start_time = bio_start_io_acct(bio); | |
1315 | ||
abfc426d CH |
1316 | read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp, |
1317 | &mddev->bio_set); | |
3b046a97 RL |
1318 | |
1319 | r1_bio->bios[rdisk] = read_bio; | |
1320 | ||
1321 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1322 | mirror->rdev->data_offset; | |
3b046a97 | 1323 | read_bio->bi_end_io = raid1_end_read_request; |
c34b7ac6 | 1324 | read_bio->bi_opf = op | do_sync; |
3b046a97 RL |
1325 | if (test_bit(FailFast, &mirror->rdev->flags) && |
1326 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1327 | read_bio->bi_opf |= MD_FAILFAST; | |
1328 | read_bio->bi_private = r1_bio; | |
1329 | ||
1330 | if (mddev->gendisk) | |
1c02fca6 CH |
1331 | trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), |
1332 | r1_bio->sector); | |
3b046a97 | 1333 | |
ed00aabd | 1334 | submit_bio_noacct(read_bio); |
3b046a97 RL |
1335 | } |
1336 | ||
c230e7e5 N |
1337 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1338 | int max_write_sectors) | |
3b046a97 RL |
1339 | { |
1340 | struct r1conf *conf = mddev->private; | |
fd76863e | 1341 | struct r1bio *r1_bio; |
1f68f0c4 | 1342 | int i, disks; |
3b046a97 | 1343 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1344 | unsigned long flags; |
3cb03002 | 1345 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1346 | struct blk_plug_cb *cb; |
1347 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 | 1348 | int first_clone; |
1f68f0c4 | 1349 | int max_sectors; |
6607cd31 | 1350 | bool write_behind = false; |
191ea9b2 | 1351 | |
b3143b9a | 1352 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1353 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1354 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 | 1355 | |
6eef4b21 | 1356 | DEFINE_WAIT(w); |
5aa70503 VV |
1357 | if (bio->bi_opf & REQ_NOWAIT) { |
1358 | bio_wouldblock_error(bio); | |
1359 | return; | |
1360 | } | |
6eef4b21 | 1361 | for (;;) { |
6eef4b21 | 1362 | prepare_to_wait(&conf->wait_barrier, |
ae89fd3d | 1363 | &w, TASK_IDLE); |
f81f7302 | 1364 | if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
385f4d7f | 1365 | bio->bi_iter.bi_sector, |
b3143b9a | 1366 | bio_end_sector(bio))) |
6eef4b21 N |
1367 | break; |
1368 | schedule(); | |
1369 | } | |
1370 | finish_wait(&conf->wait_barrier, &w); | |
1371 | } | |
f81f7302 GJ |
1372 | |
1373 | /* | |
1374 | * Register the new request and wait if the reconstruction | |
1375 | * thread has put up a bar for new requests. | |
1376 | * Continue immediately if no resync is active currently. | |
1377 | */ | |
5aa70503 VV |
1378 | if (!wait_barrier(conf, bio->bi_iter.bi_sector, |
1379 | bio->bi_opf & REQ_NOWAIT)) { | |
1380 | bio_wouldblock_error(bio); | |
1381 | return; | |
1382 | } | |
fd76863e | 1383 | |
689389a0 | 1384 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1385 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1386 | |
1f68f0c4 | 1387 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1388 | * inc refcount on their rdev. Record them by setting |
1389 | * bios[x] to bio | |
1f68f0c4 N |
1390 | * If there are known/acknowledged bad blocks on any device on |
1391 | * which we have seen a write error, we want to avoid writing those | |
1392 | * blocks. | |
1393 | * This potentially requires several writes to write around | |
1394 | * the bad blocks. Each set of writes gets it's own r1bio | |
1395 | * with a set of bios attached. | |
1da177e4 | 1396 | */ |
c3b328ac | 1397 | |
8f19ccb2 | 1398 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1399 | retry_write: |
1400 | blocked_rdev = NULL; | |
1da177e4 | 1401 | rcu_read_lock(); |
1f68f0c4 | 1402 | max_sectors = r1_bio->sectors; |
1da177e4 | 1403 | for (i = 0; i < disks; i++) { |
3cb03002 | 1404 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6607cd31 GJ |
1405 | |
1406 | /* | |
1407 | * The write-behind io is only attempted on drives marked as | |
1408 | * write-mostly, which means we could allocate write behind | |
1409 | * bio later. | |
1410 | */ | |
1411 | if (rdev && test_bit(WriteMostly, &rdev->flags)) | |
1412 | write_behind = true; | |
1413 | ||
6bfe0b49 DW |
1414 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1415 | atomic_inc(&rdev->nr_pending); | |
1416 | blocked_rdev = rdev; | |
1417 | break; | |
1418 | } | |
1f68f0c4 | 1419 | r1_bio->bios[i] = NULL; |
8ae12666 | 1420 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1421 | if (i < conf->raid_disks) |
1422 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1423 | continue; |
1424 | } | |
1425 | ||
1426 | atomic_inc(&rdev->nr_pending); | |
1427 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1428 | sector_t first_bad; | |
1429 | int bad_sectors; | |
1430 | int is_bad; | |
1431 | ||
3b046a97 | 1432 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1433 | &first_bad, &bad_sectors); |
1434 | if (is_bad < 0) { | |
1435 | /* mustn't write here until the bad block is | |
1436 | * acknowledged*/ | |
1437 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1438 | blocked_rdev = rdev; | |
1439 | break; | |
1440 | } | |
1441 | if (is_bad && first_bad <= r1_bio->sector) { | |
1442 | /* Cannot write here at all */ | |
1443 | bad_sectors -= (r1_bio->sector - first_bad); | |
1444 | if (bad_sectors < max_sectors) | |
1445 | /* mustn't write more than bad_sectors | |
1446 | * to other devices yet | |
1447 | */ | |
1448 | max_sectors = bad_sectors; | |
03c902e1 | 1449 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1450 | /* We don't set R1BIO_Degraded as that |
1451 | * only applies if the disk is | |
1452 | * missing, so it might be re-added, | |
1453 | * and we want to know to recover this | |
1454 | * chunk. | |
1455 | * In this case the device is here, | |
1456 | * and the fact that this chunk is not | |
1457 | * in-sync is recorded in the bad | |
1458 | * block log | |
1459 | */ | |
1460 | continue; | |
964147d5 | 1461 | } |
1f68f0c4 N |
1462 | if (is_bad) { |
1463 | int good_sectors = first_bad - r1_bio->sector; | |
1464 | if (good_sectors < max_sectors) | |
1465 | max_sectors = good_sectors; | |
1466 | } | |
1467 | } | |
1468 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1469 | } |
1470 | rcu_read_unlock(); | |
1471 | ||
6bfe0b49 DW |
1472 | if (unlikely(blocked_rdev)) { |
1473 | /* Wait for this device to become unblocked */ | |
1474 | int j; | |
1475 | ||
1476 | for (j = 0; j < i; j++) | |
1477 | if (r1_bio->bios[j]) | |
1478 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1479 | r1_bio->state = 0; |
fd76863e | 1480 | allow_barrier(conf, bio->bi_iter.bi_sector); |
5aa70503 VV |
1481 | |
1482 | if (bio->bi_opf & REQ_NOWAIT) { | |
1483 | bio_wouldblock_error(bio); | |
1484 | return; | |
1485 | } | |
578b54ad | 1486 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1487 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
5aa70503 | 1488 | wait_barrier(conf, bio->bi_iter.bi_sector, false); |
6bfe0b49 DW |
1489 | goto retry_write; |
1490 | } | |
1491 | ||
6607cd31 GJ |
1492 | /* |
1493 | * When using a bitmap, we may call alloc_behind_master_bio below. | |
1494 | * alloc_behind_master_bio allocates a copy of the data payload a page | |
1495 | * at a time and thus needs a new bio that can fit the whole payload | |
1496 | * this bio in page sized chunks. | |
1497 | */ | |
1498 | if (write_behind && bitmap) | |
1499 | max_sectors = min_t(int, max_sectors, | |
1500 | BIO_MAX_VECS * (PAGE_SIZE >> 9)); | |
c230e7e5 N |
1501 | if (max_sectors < bio_sectors(bio)) { |
1502 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1503 | GFP_NOIO, &conf->bio_split); |
c230e7e5 | 1504 | bio_chain(split, bio); |
ed00aabd | 1505 | submit_bio_noacct(bio); |
c230e7e5 N |
1506 | bio = split; |
1507 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1508 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1509 | } |
4b6d287f | 1510 | |
a0159832 GJ |
1511 | if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) |
1512 | r1_bio->start_time = bio_start_io_acct(bio); | |
4e78064f | 1513 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1514 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1515 | |
1f68f0c4 | 1516 | first_clone = 1; |
d8c84c4f | 1517 | |
1da177e4 | 1518 | for (i = 0; i < disks; i++) { |
8e58e327 | 1519 | struct bio *mbio = NULL; |
69df9cfc | 1520 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
1da177e4 LT |
1521 | if (!r1_bio->bios[i]) |
1522 | continue; | |
1523 | ||
46669e86 | 1524 | if (first_clone) { |
1f68f0c4 N |
1525 | /* do behind I/O ? |
1526 | * Not if there are too many, or cannot | |
1527 | * allocate memory, or a reader on WriteMostly | |
1528 | * is waiting for behind writes to flush */ | |
1529 | if (bitmap && | |
46669e86 | 1530 | test_bit(WriteMostly, &rdev->flags) && |
1f68f0c4 N |
1531 | (atomic_read(&bitmap->behind_writes) |
1532 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1533 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1534 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1535 | } |
1f68f0c4 | 1536 | |
e64e4018 AS |
1537 | md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, |
1538 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1f68f0c4 N |
1539 | first_clone = 0; |
1540 | } | |
8e58e327 | 1541 | |
841c1316 | 1542 | if (r1_bio->behind_master_bio) { |
abfc426d CH |
1543 | mbio = bio_alloc_clone(rdev->bdev, |
1544 | r1_bio->behind_master_bio, | |
1545 | GFP_NOIO, &mddev->bio_set); | |
69df9cfc | 1546 | if (test_bit(CollisionCheck, &rdev->flags)) |
d0d2d8ba | 1547 | wait_for_serialization(rdev, r1_bio); |
3e148a32 | 1548 | if (test_bit(WriteMostly, &rdev->flags)) |
4b6d287f | 1549 | atomic_inc(&r1_bio->behind_remaining); |
abfc426d CH |
1550 | } else { |
1551 | mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, | |
1552 | &mddev->bio_set); | |
1553 | ||
1554 | if (mddev->serialize_policy) | |
1555 | wait_for_serialization(rdev, r1_bio); | |
1556 | } | |
4b6d287f | 1557 | |
1f68f0c4 N |
1558 | r1_bio->bios[i] = mbio; |
1559 | ||
2e94275e | 1560 | mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset); |
1f68f0c4 | 1561 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1562 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
2e94275e GJ |
1563 | if (test_bit(FailFast, &rdev->flags) && |
1564 | !test_bit(WriteMostly, &rdev->flags) && | |
212e7eb7 N |
1565 | conf->raid_disks - mddev->degraded > 1) |
1566 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1567 | mbio->bi_private = r1_bio; |
1568 | ||
1da177e4 | 1569 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1570 | |
109e3765 | 1571 | if (mddev->gendisk) |
1c02fca6 | 1572 | trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), |
109e3765 N |
1573 | r1_bio->sector); |
1574 | /* flush_pending_writes() needs access to the rdev so...*/ | |
2e94275e | 1575 | mbio->bi_bdev = (void *)rdev; |
109e3765 | 1576 | |
f54a9d0e N |
1577 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); |
1578 | if (cb) | |
1579 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1580 | else | |
1581 | plug = NULL; | |
f54a9d0e N |
1582 | if (plug) { |
1583 | bio_list_add(&plug->pending, mbio); | |
f54a9d0e | 1584 | } else { |
23b245c0 | 1585 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e | 1586 | bio_list_add(&conf->pending_bio_list, mbio); |
23b245c0 | 1587 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1588 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1589 | } |
1da177e4 | 1590 | } |
1f68f0c4 | 1591 | |
079fa166 N |
1592 | r1_bio_write_done(r1_bio); |
1593 | ||
1594 | /* In case raid1d snuck in to freeze_array */ | |
1595 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1596 | } |
1597 | ||
cc27b0c7 | 1598 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1599 | { |
fd76863e | 1600 | sector_t sectors; |
3b046a97 | 1601 | |
775d7831 DJ |
1602 | if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
1603 | && md_flush_request(mddev, bio)) | |
cc27b0c7 | 1604 | return true; |
3b046a97 | 1605 | |
c230e7e5 N |
1606 | /* |
1607 | * There is a limit to the maximum size, but | |
1608 | * the read/write handler might find a lower limit | |
1609 | * due to bad blocks. To avoid multiple splits, | |
1610 | * we pass the maximum number of sectors down | |
1611 | * and let the lower level perform the split. | |
1612 | */ | |
1613 | sectors = align_to_barrier_unit_end( | |
1614 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1615 | |
c230e7e5 | 1616 | if (bio_data_dir(bio) == READ) |
689389a0 | 1617 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1618 | else { |
1619 | if (!md_write_start(mddev,bio)) | |
1620 | return false; | |
c230e7e5 | 1621 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1622 | } |
1623 | return true; | |
3b046a97 RL |
1624 | } |
1625 | ||
849674e4 | 1626 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1627 | { |
e8096360 | 1628 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1629 | int i; |
1630 | ||
1631 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1632 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1633 | rcu_read_lock(); |
1634 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1635 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1636 | seq_printf(seq, "%s", |
ddac7c7e N |
1637 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1638 | } | |
1639 | rcu_read_unlock(); | |
1da177e4 LT |
1640 | seq_printf(seq, "]"); |
1641 | } | |
1642 | ||
9631abdb MT |
1643 | /** |
1644 | * raid1_error() - RAID1 error handler. | |
1645 | * @mddev: affected md device. | |
1646 | * @rdev: member device to fail. | |
1647 | * | |
1648 | * The routine acknowledges &rdev failure and determines new @mddev state. | |
1649 | * If it failed, then: | |
1650 | * - &MD_BROKEN flag is set in &mddev->flags. | |
1651 | * - recovery is disabled. | |
1652 | * Otherwise, it must be degraded: | |
1653 | * - recovery is interrupted. | |
1654 | * - &mddev->degraded is bumped. | |
1655 | * | |
1656 | * @rdev is marked as &Faulty excluding case when array is failed and | |
1657 | * &mddev->fail_last_dev is off. | |
1658 | */ | |
849674e4 | 1659 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1660 | { |
e8096360 | 1661 | struct r1conf *conf = mddev->private; |
423f04d6 | 1662 | unsigned long flags; |
1da177e4 | 1663 | |
2e52d449 | 1664 | spin_lock_irqsave(&conf->device_lock, flags); |
9631abdb MT |
1665 | |
1666 | if (test_bit(In_sync, &rdev->flags) && | |
1667 | (conf->raid_disks - mddev->degraded) == 1) { | |
1668 | set_bit(MD_BROKEN, &mddev->flags); | |
1669 | ||
1670 | if (!mddev->fail_last_dev) { | |
1671 | conf->recovery_disabled = mddev->recovery_disabled; | |
1672 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1673 | return; | |
1674 | } | |
4044ba58 | 1675 | } |
de393cde | 1676 | set_bit(Blocked, &rdev->flags); |
ebda52fa | 1677 | if (test_and_clear_bit(In_sync, &rdev->flags)) |
1da177e4 | 1678 | mddev->degraded++; |
ebda52fa | 1679 | set_bit(Faulty, &rdev->flags); |
423f04d6 | 1680 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1681 | /* |
1682 | * if recovery is running, make sure it aborts. | |
1683 | */ | |
1684 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1685 | set_mask_bits(&mddev->sb_flags, 0, |
1686 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
913cce5a | 1687 | pr_crit("md/raid1:%s: Disk failure on %pg, disabling device.\n" |
1d41c216 | 1688 | "md/raid1:%s: Operation continuing on %d devices.\n", |
913cce5a | 1689 | mdname(mddev), rdev->bdev, |
1d41c216 | 1690 | mdname(mddev), conf->raid_disks - mddev->degraded); |
1da177e4 LT |
1691 | } |
1692 | ||
e8096360 | 1693 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1694 | { |
1695 | int i; | |
1da177e4 | 1696 | |
1d41c216 | 1697 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1698 | if (!conf) { |
1d41c216 | 1699 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1700 | return; |
1701 | } | |
1d41c216 N |
1702 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1703 | conf->raid_disks); | |
1da177e4 | 1704 | |
ddac7c7e | 1705 | rcu_read_lock(); |
1da177e4 | 1706 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1707 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1708 | if (rdev) |
913cce5a | 1709 | pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n", |
1d41c216 N |
1710 | i, !test_bit(In_sync, &rdev->flags), |
1711 | !test_bit(Faulty, &rdev->flags), | |
913cce5a | 1712 | rdev->bdev); |
1da177e4 | 1713 | } |
ddac7c7e | 1714 | rcu_read_unlock(); |
1da177e4 LT |
1715 | } |
1716 | ||
e8096360 | 1717 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1718 | { |
f6eca2d4 ND |
1719 | int idx; |
1720 | ||
1721 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { | |
5aa70503 | 1722 | _wait_barrier(conf, idx, false); |
f6eca2d4 ND |
1723 | _allow_barrier(conf, idx); |
1724 | } | |
1da177e4 | 1725 | |
afeee514 | 1726 | mempool_exit(&conf->r1buf_pool); |
1da177e4 LT |
1727 | } |
1728 | ||
fd01b88c | 1729 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1730 | { |
1731 | int i; | |
e8096360 | 1732 | struct r1conf *conf = mddev->private; |
6b965620 N |
1733 | int count = 0; |
1734 | unsigned long flags; | |
1da177e4 LT |
1735 | |
1736 | /* | |
f72ffdd6 | 1737 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1738 | * and mark them readable. |
1739 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1740 | * device_lock used to avoid races with raid1_end_read_request |
1741 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1742 | */ |
423f04d6 | 1743 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1744 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1745 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1746 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1747 | if (repl | |
1aee41f6 | 1748 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1749 | && repl->recovery_offset == MaxSector |
1750 | && !test_bit(Faulty, &repl->flags) | |
1751 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1752 | /* replacement has just become active */ | |
1753 | if (!rdev || | |
1754 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1755 | count++; | |
1756 | if (rdev) { | |
1757 | /* Replaced device not technically | |
1758 | * faulty, but we need to be sure | |
1759 | * it gets removed and never re-added | |
1760 | */ | |
1761 | set_bit(Faulty, &rdev->flags); | |
1762 | sysfs_notify_dirent_safe( | |
1763 | rdev->sysfs_state); | |
1764 | } | |
1765 | } | |
ddac7c7e | 1766 | if (rdev |
61e4947c | 1767 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1768 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1769 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1770 | count++; |
654e8b5a | 1771 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1772 | } |
1773 | } | |
6b965620 N |
1774 | mddev->degraded -= count; |
1775 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1776 | |
1777 | print_conf(conf); | |
6b965620 | 1778 | return count; |
1da177e4 LT |
1779 | } |
1780 | ||
fd01b88c | 1781 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1782 | { |
e8096360 | 1783 | struct r1conf *conf = mddev->private; |
199050ea | 1784 | int err = -EEXIST; |
41158c7e | 1785 | int mirror = 0; |
0eaf822c | 1786 | struct raid1_info *p; |
6c2fce2e | 1787 | int first = 0; |
30194636 | 1788 | int last = conf->raid_disks - 1; |
1da177e4 | 1789 | |
5389042f N |
1790 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1791 | return -EBUSY; | |
1792 | ||
1501efad DW |
1793 | if (md_integrity_add_rdev(rdev, mddev)) |
1794 | return -ENXIO; | |
1795 | ||
6c2fce2e NB |
1796 | if (rdev->raid_disk >= 0) |
1797 | first = last = rdev->raid_disk; | |
1798 | ||
70bcecdb GR |
1799 | /* |
1800 | * find the disk ... but prefer rdev->saved_raid_disk | |
1801 | * if possible. | |
1802 | */ | |
1803 | if (rdev->saved_raid_disk >= 0 && | |
1804 | rdev->saved_raid_disk >= first && | |
9e753ba9 | 1805 | rdev->saved_raid_disk < conf->raid_disks && |
70bcecdb GR |
1806 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1807 | first = last = rdev->saved_raid_disk; | |
1808 | ||
7ef449d1 | 1809 | for (mirror = first; mirror <= last; mirror++) { |
ebfeb444 | 1810 | p = conf->mirrors + mirror; |
7ef449d1 | 1811 | if (!p->rdev) { |
9092c02d JB |
1812 | if (mddev->gendisk) |
1813 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1814 | rdev->data_offset << 9); | |
1da177e4 LT |
1815 | |
1816 | p->head_position = 0; | |
1817 | rdev->raid_disk = mirror; | |
199050ea | 1818 | err = 0; |
6aea114a N |
1819 | /* As all devices are equivalent, we don't need a full recovery |
1820 | * if this was recently any drive of the array | |
1821 | */ | |
1822 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1823 | conf->fullsync = 1; |
d6065f7b | 1824 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1825 | break; |
1826 | } | |
7ef449d1 N |
1827 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1828 | p[conf->raid_disks].rdev == NULL) { | |
1829 | /* Add this device as a replacement */ | |
1830 | clear_bit(In_sync, &rdev->flags); | |
1831 | set_bit(Replacement, &rdev->flags); | |
1832 | rdev->raid_disk = mirror; | |
1833 | err = 0; | |
1834 | conf->fullsync = 1; | |
1835 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1836 | break; | |
1837 | } | |
1838 | } | |
1da177e4 | 1839 | print_conf(conf); |
199050ea | 1840 | return err; |
1da177e4 LT |
1841 | } |
1842 | ||
b8321b68 | 1843 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1844 | { |
e8096360 | 1845 | struct r1conf *conf = mddev->private; |
1da177e4 | 1846 | int err = 0; |
b8321b68 | 1847 | int number = rdev->raid_disk; |
0eaf822c | 1848 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1849 | |
b014f14c N |
1850 | if (rdev != p->rdev) |
1851 | p = conf->mirrors + conf->raid_disks + number; | |
1852 | ||
1da177e4 | 1853 | print_conf(conf); |
b8321b68 | 1854 | if (rdev == p->rdev) { |
b2d444d7 | 1855 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1856 | atomic_read(&rdev->nr_pending)) { |
1857 | err = -EBUSY; | |
1858 | goto abort; | |
1859 | } | |
046abeed | 1860 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1861 | * is not possible. |
1862 | */ | |
1863 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1864 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1865 | mddev->degraded < conf->raid_disks) { |
1866 | err = -EBUSY; | |
1867 | goto abort; | |
1868 | } | |
1da177e4 | 1869 | p->rdev = NULL; |
d787be40 N |
1870 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1871 | synchronize_rcu(); | |
1872 | if (atomic_read(&rdev->nr_pending)) { | |
1873 | /* lost the race, try later */ | |
1874 | err = -EBUSY; | |
1875 | p->rdev = rdev; | |
1876 | goto abort; | |
1877 | } | |
1878 | } | |
1879 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1880 | /* We just removed a device that is being replaced. |
1881 | * Move down the replacement. We drain all IO before | |
1882 | * doing this to avoid confusion. | |
1883 | */ | |
1884 | struct md_rdev *repl = | |
1885 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1886 | freeze_array(conf, 0); |
3de59bb9 YY |
1887 | if (atomic_read(&repl->nr_pending)) { |
1888 | /* It means that some queued IO of retry_list | |
1889 | * hold repl. Thus, we cannot set replacement | |
1890 | * as NULL, avoiding rdev NULL pointer | |
1891 | * dereference in sync_request_write and | |
1892 | * handle_write_finished. | |
1893 | */ | |
1894 | err = -EBUSY; | |
1895 | unfreeze_array(conf); | |
1896 | goto abort; | |
1897 | } | |
8c7a2c2b N |
1898 | clear_bit(Replacement, &repl->flags); |
1899 | p->rdev = repl; | |
1900 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1901 | unfreeze_array(conf); |
e5bc9c3c GJ |
1902 | } |
1903 | ||
1904 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1905 | err = md_integrity_register(mddev); |
1da177e4 LT |
1906 | } |
1907 | abort: | |
1908 | ||
1909 | print_conf(conf); | |
1910 | return err; | |
1911 | } | |
1912 | ||
4246a0b6 | 1913 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1914 | { |
98d30c58 | 1915 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1916 | |
0fc280f6 | 1917 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1918 | |
1da177e4 LT |
1919 | /* |
1920 | * we have read a block, now it needs to be re-written, | |
1921 | * or re-read if the read failed. | |
1922 | * We don't do much here, just schedule handling by raid1d | |
1923 | */ | |
4e4cbee9 | 1924 | if (!bio->bi_status) |
1da177e4 | 1925 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1926 | |
1927 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1928 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1929 | } |
1930 | ||
dfcc34c9 ND |
1931 | static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) |
1932 | { | |
1933 | sector_t sync_blocks = 0; | |
1934 | sector_t s = r1_bio->sector; | |
1935 | long sectors_to_go = r1_bio->sectors; | |
1936 | ||
1937 | /* make sure these bits don't get cleared. */ | |
1938 | do { | |
1939 | md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); | |
1940 | s += sync_blocks; | |
1941 | sectors_to_go -= sync_blocks; | |
1942 | } while (sectors_to_go > 0); | |
1943 | } | |
1944 | ||
449808a2 HT |
1945 | static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) |
1946 | { | |
1947 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
1948 | struct mddev *mddev = r1_bio->mddev; | |
1949 | int s = r1_bio->sectors; | |
1950 | ||
1951 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
1952 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1953 | reschedule_retry(r1_bio); | |
1954 | else { | |
1955 | put_buf(r1_bio); | |
1956 | md_done_sync(mddev, s, uptodate); | |
1957 | } | |
1958 | } | |
1959 | } | |
1960 | ||
4246a0b6 | 1961 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1962 | { |
4e4cbee9 | 1963 | int uptodate = !bio->bi_status; |
98d30c58 | 1964 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1965 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1966 | struct r1conf *conf = mddev->private; |
4367af55 N |
1967 | sector_t first_bad; |
1968 | int bad_sectors; | |
854abd75 | 1969 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1970 | |
6b1117d5 | 1971 | if (!uptodate) { |
dfcc34c9 | 1972 | abort_sync_write(mddev, r1_bio); |
854abd75 N |
1973 | set_bit(WriteErrorSeen, &rdev->flags); |
1974 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1975 | set_bit(MD_RECOVERY_NEEDED, & |
1976 | mddev->recovery); | |
d8f05d29 | 1977 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1978 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1979 | &first_bad, &bad_sectors) && |
1980 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1981 | r1_bio->sector, | |
1982 | r1_bio->sectors, | |
1983 | &first_bad, &bad_sectors) | |
1984 | ) | |
4367af55 | 1985 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1986 | |
449808a2 | 1987 | put_sync_write_buf(r1_bio, uptodate); |
1da177e4 LT |
1988 | } |
1989 | ||
3cb03002 | 1990 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
4ce4c73f | 1991 | int sectors, struct page *page, int rw) |
d8f05d29 | 1992 | { |
4ce4c73f | 1993 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) |
d8f05d29 N |
1994 | /* success */ |
1995 | return 1; | |
19d67169 | 1996 | if (rw == WRITE) { |
d8f05d29 | 1997 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1998 | if (!test_and_set_bit(WantReplacement, |
1999 | &rdev->flags)) | |
2000 | set_bit(MD_RECOVERY_NEEDED, & | |
2001 | rdev->mddev->recovery); | |
2002 | } | |
d8f05d29 N |
2003 | /* need to record an error - either for the block or the device */ |
2004 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
2005 | md_error(rdev->mddev, rdev); | |
2006 | return 0; | |
2007 | } | |
2008 | ||
9f2c9d12 | 2009 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 2010 | { |
a68e5870 N |
2011 | /* Try some synchronous reads of other devices to get |
2012 | * good data, much like with normal read errors. Only | |
2013 | * read into the pages we already have so we don't | |
2014 | * need to re-issue the read request. | |
2015 | * We don't need to freeze the array, because being in an | |
2016 | * active sync request, there is no normal IO, and | |
2017 | * no overlapping syncs. | |
06f60385 N |
2018 | * We don't need to check is_badblock() again as we |
2019 | * made sure that anything with a bad block in range | |
2020 | * will have bi_end_io clear. | |
a68e5870 | 2021 | */ |
fd01b88c | 2022 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2023 | struct r1conf *conf = mddev->private; |
a68e5870 | 2024 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 2025 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
2026 | sector_t sect = r1_bio->sector; |
2027 | int sectors = r1_bio->sectors; | |
2028 | int idx = 0; | |
2e52d449 N |
2029 | struct md_rdev *rdev; |
2030 | ||
2031 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
2032 | if (test_bit(FailFast, &rdev->flags)) { | |
2033 | /* Don't try recovering from here - just fail it | |
2034 | * ... unless it is the last working device of course */ | |
2035 | md_error(mddev, rdev); | |
2036 | if (test_bit(Faulty, &rdev->flags)) | |
2037 | /* Don't try to read from here, but make sure | |
2038 | * put_buf does it's thing | |
2039 | */ | |
2040 | bio->bi_end_io = end_sync_write; | |
2041 | } | |
a68e5870 N |
2042 | |
2043 | while(sectors) { | |
2044 | int s = sectors; | |
2045 | int d = r1_bio->read_disk; | |
2046 | int success = 0; | |
78d7f5f7 | 2047 | int start; |
a68e5870 N |
2048 | |
2049 | if (s > (PAGE_SIZE>>9)) | |
2050 | s = PAGE_SIZE >> 9; | |
2051 | do { | |
2052 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
2053 | /* No rcu protection needed here devices | |
2054 | * can only be removed when no resync is | |
2055 | * active, and resync is currently active | |
2056 | */ | |
2057 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 2058 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 2059 | pages[idx], |
4ce4c73f | 2060 | REQ_OP_READ, false)) { |
a68e5870 N |
2061 | success = 1; |
2062 | break; | |
2063 | } | |
2064 | } | |
2065 | d++; | |
8f19ccb2 | 2066 | if (d == conf->raid_disks * 2) |
a68e5870 N |
2067 | d = 0; |
2068 | } while (!success && d != r1_bio->read_disk); | |
2069 | ||
78d7f5f7 | 2070 | if (!success) { |
3a9f28a5 N |
2071 | int abort = 0; |
2072 | /* Cannot read from anywhere, this block is lost. | |
2073 | * Record a bad block on each device. If that doesn't | |
2074 | * work just disable and interrupt the recovery. | |
2075 | * Don't fail devices as that won't really help. | |
2076 | */ | |
ac483eb3 CH |
2077 | pr_crit_ratelimited("md/raid1:%s: %pg: unrecoverable I/O read error for block %llu\n", |
2078 | mdname(mddev), bio->bi_bdev, | |
1d41c216 | 2079 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 2080 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
2081 | rdev = conf->mirrors[d].rdev; |
2082 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
2083 | continue; | |
2084 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
2085 | abort = 1; | |
2086 | } | |
2087 | if (abort) { | |
d890fa2b N |
2088 | conf->recovery_disabled = |
2089 | mddev->recovery_disabled; | |
3a9f28a5 N |
2090 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2091 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2092 | put_buf(r1_bio); | |
2093 | return 0; | |
2094 | } | |
2095 | /* Try next page */ | |
2096 | sectors -= s; | |
2097 | sect += s; | |
2098 | idx++; | |
2099 | continue; | |
d11c171e | 2100 | } |
78d7f5f7 N |
2101 | |
2102 | start = d; | |
2103 | /* write it back and re-read */ | |
2104 | while (d != r1_bio->read_disk) { | |
2105 | if (d == 0) | |
8f19ccb2 | 2106 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2107 | d--; |
2108 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2109 | continue; | |
2110 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2111 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2112 | pages[idx], |
d8f05d29 | 2113 | WRITE) == 0) { |
78d7f5f7 N |
2114 | r1_bio->bios[d]->bi_end_io = NULL; |
2115 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2116 | } |
78d7f5f7 N |
2117 | } |
2118 | d = start; | |
2119 | while (d != r1_bio->read_disk) { | |
2120 | if (d == 0) | |
8f19ccb2 | 2121 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2122 | d--; |
2123 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2124 | continue; | |
2125 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2126 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2127 | pages[idx], |
d8f05d29 | 2128 | READ) != 0) |
9d3d8011 | 2129 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2130 | } |
a68e5870 N |
2131 | sectors -= s; |
2132 | sect += s; | |
2133 | idx ++; | |
2134 | } | |
78d7f5f7 | 2135 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2136 | bio->bi_status = 0; |
a68e5870 N |
2137 | return 1; |
2138 | } | |
2139 | ||
c95e6385 | 2140 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2141 | { |
2142 | /* We have read all readable devices. If we haven't | |
2143 | * got the block, then there is no hope left. | |
2144 | * If we have, then we want to do a comparison | |
2145 | * and skip the write if everything is the same. | |
2146 | * If any blocks failed to read, then we need to | |
2147 | * attempt an over-write | |
2148 | */ | |
fd01b88c | 2149 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2150 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2151 | int primary; |
2152 | int i; | |
f4380a91 | 2153 | int vcnt; |
a68e5870 | 2154 | |
30bc9b53 N |
2155 | /* Fix variable parts of all bios */ |
2156 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2157 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2158 | blk_status_t status; |
30bc9b53 | 2159 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2160 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2161 | if (b->bi_end_io != end_sync_read) |
2162 | continue; | |
4246a0b6 | 2163 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2164 | status = b->bi_status; |
a7c50c94 | 2165 | bio_reset(b, conf->mirrors[i].rdev->bdev, REQ_OP_READ); |
4e4cbee9 | 2166 | b->bi_status = status; |
4f024f37 | 2167 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2168 | conf->mirrors[i].rdev->data_offset; |
30bc9b53 | 2169 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2170 | rp->raid_bio = r1_bio; |
2171 | b->bi_private = rp; | |
30bc9b53 | 2172 | |
fb0eb5df ML |
2173 | /* initialize bvec table again */ |
2174 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2175 | } |
8f19ccb2 | 2176 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2177 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2178 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2179 | r1_bio->bios[primary]->bi_end_io = NULL; |
2180 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2181 | break; | |
2182 | } | |
2183 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2184 | for (i = 0; i < conf->raid_disks * 2; i++) { |
2b070cfe | 2185 | int j = 0; |
78d7f5f7 N |
2186 | struct bio *pbio = r1_bio->bios[primary]; |
2187 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2188 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2189 | struct page **ppages = get_resync_pages(pbio)->pages; |
2190 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2191 | struct bio_vec *bi; |
8fc04e6e | 2192 | int page_len[RESYNC_PAGES] = { 0 }; |
6dc4f100 | 2193 | struct bvec_iter_all iter_all; |
a68e5870 | 2194 | |
2aabaa65 | 2195 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2196 | continue; |
4246a0b6 | 2197 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2198 | sbio->bi_status = 0; |
78d7f5f7 | 2199 | |
2b070cfe CH |
2200 | bio_for_each_segment_all(bi, sbio, iter_all) |
2201 | page_len[j++] = bi->bv_len; | |
60928a91 | 2202 | |
4e4cbee9 | 2203 | if (!status) { |
78d7f5f7 | 2204 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2205 | if (memcmp(page_address(ppages[j]), |
2206 | page_address(spages[j]), | |
60928a91 | 2207 | page_len[j])) |
78d7f5f7 | 2208 | break; |
69382e85 | 2209 | } |
78d7f5f7 N |
2210 | } else |
2211 | j = 0; | |
2212 | if (j >= 0) | |
7f7583d4 | 2213 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2214 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2215 | && !status)) { |
78d7f5f7 N |
2216 | /* No need to write to this device. */ |
2217 | sbio->bi_end_io = NULL; | |
2218 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2219 | continue; | |
2220 | } | |
d3b45c2a KO |
2221 | |
2222 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2223 | } |
a68e5870 N |
2224 | } |
2225 | ||
9f2c9d12 | 2226 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2227 | { |
e8096360 | 2228 | struct r1conf *conf = mddev->private; |
a68e5870 | 2229 | int i; |
8f19ccb2 | 2230 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2231 | struct bio *wbio; |
a68e5870 | 2232 | |
a68e5870 N |
2233 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2234 | /* ouch - failed to read all of that. */ | |
2235 | if (!fix_sync_read_error(r1_bio)) | |
2236 | return; | |
7ca78d57 N |
2237 | |
2238 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2239 | process_checks(r1_bio); |
2240 | ||
d11c171e N |
2241 | /* |
2242 | * schedule writes | |
2243 | */ | |
1da177e4 LT |
2244 | atomic_set(&r1_bio->remaining, 1); |
2245 | for (i = 0; i < disks ; i++) { | |
2246 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2247 | if (wbio->bi_end_io == NULL || |
2248 | (wbio->bi_end_io == end_sync_read && | |
2249 | (i == r1_bio->read_disk || | |
2250 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2251 | continue; |
dfcc34c9 ND |
2252 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { |
2253 | abort_sync_write(mddev, r1_bio); | |
0c9d5b12 | 2254 | continue; |
dfcc34c9 | 2255 | } |
1da177e4 | 2256 | |
c34b7ac6 | 2257 | wbio->bi_opf = REQ_OP_WRITE; |
212e7eb7 N |
2258 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2259 | wbio->bi_opf |= MD_FAILFAST; | |
2260 | ||
3e198f78 | 2261 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2262 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2263 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2264 | |
ed00aabd | 2265 | submit_bio_noacct(wbio); |
1da177e4 LT |
2266 | } |
2267 | ||
449808a2 | 2268 | put_sync_write_buf(r1_bio, 1); |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | /* | |
2272 | * This is a kernel thread which: | |
2273 | * | |
2274 | * 1. Retries failed read operations on working mirrors. | |
2275 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2276 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2277 | */ |
2278 | ||
e8096360 | 2279 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2280 | sector_t sect, int sectors) |
2281 | { | |
fd01b88c | 2282 | struct mddev *mddev = conf->mddev; |
867868fb N |
2283 | while(sectors) { |
2284 | int s = sectors; | |
2285 | int d = read_disk; | |
2286 | int success = 0; | |
2287 | int start; | |
3cb03002 | 2288 | struct md_rdev *rdev; |
867868fb N |
2289 | |
2290 | if (s > (PAGE_SIZE>>9)) | |
2291 | s = PAGE_SIZE >> 9; | |
2292 | ||
2293 | do { | |
d2eb35ac N |
2294 | sector_t first_bad; |
2295 | int bad_sectors; | |
2296 | ||
707a6a42 N |
2297 | rcu_read_lock(); |
2298 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2299 | if (rdev && |
da8840a7 | 2300 | (test_bit(In_sync, &rdev->flags) || |
2301 | (!test_bit(Faulty, &rdev->flags) && | |
2302 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2303 | is_badblock(rdev, sect, s, |
707a6a42 N |
2304 | &first_bad, &bad_sectors) == 0) { |
2305 | atomic_inc(&rdev->nr_pending); | |
2306 | rcu_read_unlock(); | |
2307 | if (sync_page_io(rdev, sect, s<<9, | |
4ce4c73f | 2308 | conf->tmppage, REQ_OP_READ, false)) |
707a6a42 N |
2309 | success = 1; |
2310 | rdev_dec_pending(rdev, mddev); | |
2311 | if (success) | |
2312 | break; | |
2313 | } else | |
2314 | rcu_read_unlock(); | |
2315 | d++; | |
2316 | if (d == conf->raid_disks * 2) | |
2317 | d = 0; | |
867868fb N |
2318 | } while (!success && d != read_disk); |
2319 | ||
2320 | if (!success) { | |
d8f05d29 | 2321 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2322 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2323 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2324 | md_error(mddev, rdev); | |
867868fb N |
2325 | break; |
2326 | } | |
2327 | /* write it back and re-read */ | |
2328 | start = d; | |
2329 | while (d != read_disk) { | |
2330 | if (d==0) | |
8f19ccb2 | 2331 | d = conf->raid_disks * 2; |
867868fb | 2332 | d--; |
707a6a42 N |
2333 | rcu_read_lock(); |
2334 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2335 | if (rdev && |
707a6a42 N |
2336 | !test_bit(Faulty, &rdev->flags)) { |
2337 | atomic_inc(&rdev->nr_pending); | |
2338 | rcu_read_unlock(); | |
d8f05d29 N |
2339 | r1_sync_page_io(rdev, sect, s, |
2340 | conf->tmppage, WRITE); | |
707a6a42 N |
2341 | rdev_dec_pending(rdev, mddev); |
2342 | } else | |
2343 | rcu_read_unlock(); | |
867868fb N |
2344 | } |
2345 | d = start; | |
2346 | while (d != read_disk) { | |
867868fb | 2347 | if (d==0) |
8f19ccb2 | 2348 | d = conf->raid_disks * 2; |
867868fb | 2349 | d--; |
707a6a42 N |
2350 | rcu_read_lock(); |
2351 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2352 | if (rdev && |
b8cb6b4c | 2353 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2354 | atomic_inc(&rdev->nr_pending); |
2355 | rcu_read_unlock(); | |
d8f05d29 N |
2356 | if (r1_sync_page_io(rdev, sect, s, |
2357 | conf->tmppage, READ)) { | |
867868fb | 2358 | atomic_add(s, &rdev->corrected_errors); |
913cce5a | 2359 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %pg)\n", |
1d41c216 N |
2360 | mdname(mddev), s, |
2361 | (unsigned long long)(sect + | |
2362 | rdev->data_offset), | |
913cce5a | 2363 | rdev->bdev); |
867868fb | 2364 | } |
707a6a42 N |
2365 | rdev_dec_pending(rdev, mddev); |
2366 | } else | |
2367 | rcu_read_unlock(); | |
867868fb N |
2368 | } |
2369 | sectors -= s; | |
2370 | sect += s; | |
2371 | } | |
2372 | } | |
2373 | ||
9f2c9d12 | 2374 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2375 | { |
fd01b88c | 2376 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2377 | struct r1conf *conf = mddev->private; |
3cb03002 | 2378 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2379 | |
2380 | /* bio has the data to be written to device 'i' where | |
2381 | * we just recently had a write error. | |
2382 | * We repeatedly clone the bio and trim down to one block, | |
2383 | * then try the write. Where the write fails we record | |
2384 | * a bad block. | |
2385 | * It is conceivable that the bio doesn't exactly align with | |
2386 | * blocks. We must handle this somehow. | |
2387 | * | |
2388 | * We currently own a reference on the rdev. | |
2389 | */ | |
2390 | ||
2391 | int block_sectors; | |
2392 | sector_t sector; | |
2393 | int sectors; | |
2394 | int sect_to_write = r1_bio->sectors; | |
2395 | int ok = 1; | |
2396 | ||
2397 | if (rdev->badblocks.shift < 0) | |
2398 | return 0; | |
2399 | ||
ab713cdc ND |
2400 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2401 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2402 | sector = r1_bio->sector; |
2403 | sectors = ((sector + block_sectors) | |
2404 | & ~(sector_t)(block_sectors - 1)) | |
2405 | - sector; | |
2406 | ||
cd5ff9a1 N |
2407 | while (sect_to_write) { |
2408 | struct bio *wbio; | |
2409 | if (sectors > sect_to_write) | |
2410 | sectors = sect_to_write; | |
2411 | /* Write at 'sector' for 'sectors'*/ | |
2412 | ||
b783863f | 2413 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
abfc426d CH |
2414 | wbio = bio_alloc_clone(rdev->bdev, |
2415 | r1_bio->behind_master_bio, | |
2416 | GFP_NOIO, &mddev->bio_set); | |
b783863f | 2417 | } else { |
abfc426d CH |
2418 | wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio, |
2419 | GFP_NOIO, &mddev->bio_set); | |
b783863f KO |
2420 | } |
2421 | ||
c34b7ac6 | 2422 | wbio->bi_opf = REQ_OP_WRITE; |
4f024f37 KO |
2423 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2424 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2425 | |
6678d83f | 2426 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2427 | wbio->bi_iter.bi_sector += rdev->data_offset; |
4e49ea4a MC |
2428 | |
2429 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2430 | /* failure! */ |
2431 | ok = rdev_set_badblocks(rdev, sector, | |
2432 | sectors, 0) | |
2433 | && ok; | |
2434 | ||
2435 | bio_put(wbio); | |
2436 | sect_to_write -= sectors; | |
2437 | sector += sectors; | |
2438 | sectors = block_sectors; | |
2439 | } | |
2440 | return ok; | |
2441 | } | |
2442 | ||
e8096360 | 2443 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2444 | { |
2445 | int m; | |
2446 | int s = r1_bio->sectors; | |
8f19ccb2 | 2447 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2448 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2449 | struct bio *bio = r1_bio->bios[m]; |
2450 | if (bio->bi_end_io == NULL) | |
2451 | continue; | |
4e4cbee9 | 2452 | if (!bio->bi_status && |
62096bce | 2453 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2454 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2455 | } |
4e4cbee9 | 2456 | if (bio->bi_status && |
62096bce N |
2457 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2458 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2459 | md_error(conf->mddev, rdev); | |
2460 | } | |
2461 | } | |
2462 | put_buf(r1_bio); | |
2463 | md_done_sync(conf->mddev, s, 1); | |
2464 | } | |
2465 | ||
e8096360 | 2466 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2467 | { |
fd76863e | 2468 | int m, idx; |
55ce74d4 | 2469 | bool fail = false; |
fd76863e | 2470 | |
8f19ccb2 | 2471 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2472 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2473 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2474 | rdev_clear_badblocks(rdev, |
2475 | r1_bio->sector, | |
c6563a8c | 2476 | r1_bio->sectors, 0); |
62096bce N |
2477 | rdev_dec_pending(rdev, conf->mddev); |
2478 | } else if (r1_bio->bios[m] != NULL) { | |
2479 | /* This drive got a write error. We need to | |
2480 | * narrow down and record precise write | |
2481 | * errors. | |
2482 | */ | |
55ce74d4 | 2483 | fail = true; |
62096bce N |
2484 | if (!narrow_write_error(r1_bio, m)) { |
2485 | md_error(conf->mddev, | |
2486 | conf->mirrors[m].rdev); | |
2487 | /* an I/O failed, we can't clear the bitmap */ | |
2488 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2489 | } | |
2490 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2491 | conf->mddev); | |
2492 | } | |
55ce74d4 N |
2493 | if (fail) { |
2494 | spin_lock_irq(&conf->device_lock); | |
2495 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2496 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2497 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2498 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2499 | /* |
2500 | * In case freeze_array() is waiting for condition | |
2501 | * get_unqueued_pending() == extra to be true. | |
2502 | */ | |
2503 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2504 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2505 | } else { |
2506 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2507 | close_write(r1_bio); | |
55ce74d4 | 2508 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2509 | } |
62096bce N |
2510 | } |
2511 | ||
e8096360 | 2512 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2513 | { |
fd01b88c | 2514 | struct mddev *mddev = conf->mddev; |
62096bce | 2515 | struct bio *bio; |
3cb03002 | 2516 | struct md_rdev *rdev; |
62096bce N |
2517 | |
2518 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2519 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2520 | * the block and we can fix it. | |
2521 | * We freeze all other IO, and try reading the block from | |
2522 | * other devices. When we find one, we re-write | |
2523 | * and check it that fixes the read error. | |
2524 | * This is all done synchronously while the array is | |
2525 | * frozen | |
2526 | */ | |
7449f699 TM |
2527 | |
2528 | bio = r1_bio->bios[r1_bio->read_disk]; | |
7449f699 TM |
2529 | bio_put(bio); |
2530 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2531 | ||
2e52d449 N |
2532 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2533 | if (mddev->ro == 0 | |
2534 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2535 | freeze_array(conf, 1); |
62096bce N |
2536 | fix_read_error(conf, r1_bio->read_disk, |
2537 | r1_bio->sector, r1_bio->sectors); | |
2538 | unfreeze_array(conf); | |
b33d1062 GK |
2539 | } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { |
2540 | md_error(mddev, rdev); | |
7449f699 TM |
2541 | } else { |
2542 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2543 | } | |
2544 | ||
2e52d449 | 2545 | rdev_dec_pending(rdev, conf->mddev); |
689389a0 N |
2546 | allow_barrier(conf, r1_bio->sector); |
2547 | bio = r1_bio->master_bio; | |
62096bce | 2548 | |
689389a0 N |
2549 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2550 | r1_bio->state = 0; | |
2551 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
62096bce N |
2552 | } |
2553 | ||
4ed8731d | 2554 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2555 | { |
4ed8731d | 2556 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2557 | struct r1bio *r1_bio; |
1da177e4 | 2558 | unsigned long flags; |
e8096360 | 2559 | struct r1conf *conf = mddev->private; |
1da177e4 | 2560 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2561 | struct blk_plug plug; |
fd76863e | 2562 | int idx; |
1da177e4 LT |
2563 | |
2564 | md_check_recovery(mddev); | |
e1dfa0a2 | 2565 | |
55ce74d4 | 2566 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2567 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2568 | LIST_HEAD(tmp); |
2569 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2570 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2571 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2572 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2573 | while (!list_empty(&tmp)) { | |
a452744b MP |
2574 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2575 | retry_list); | |
55ce74d4 | 2576 | list_del(&r1_bio->retry_list); |
fd76863e | 2577 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2578 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2579 | if (mddev->degraded) |
2580 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2581 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2582 | close_write(r1_bio); | |
55ce74d4 N |
2583 | raid_end_bio_io(r1_bio); |
2584 | } | |
2585 | } | |
2586 | ||
e1dfa0a2 | 2587 | blk_start_plug(&plug); |
1da177e4 | 2588 | for (;;) { |
191ea9b2 | 2589 | |
0021b7bc | 2590 | flush_pending_writes(conf); |
191ea9b2 | 2591 | |
a35e63ef N |
2592 | spin_lock_irqsave(&conf->device_lock, flags); |
2593 | if (list_empty(head)) { | |
2594 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2595 | break; |
a35e63ef | 2596 | } |
9f2c9d12 | 2597 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2598 | list_del(head->prev); |
fd76863e | 2599 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2600 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2601 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2602 | ||
2603 | mddev = r1_bio->mddev; | |
070ec55d | 2604 | conf = mddev->private; |
4367af55 | 2605 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2606 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2607 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2608 | handle_sync_write_finished(conf, r1_bio); | |
2609 | else | |
4367af55 | 2610 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2611 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2612 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2613 | handle_write_finished(conf, r1_bio); | |
2614 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2615 | handle_read_error(conf, r1_bio); | |
2616 | else | |
c230e7e5 | 2617 | WARN_ON_ONCE(1); |
62096bce | 2618 | |
1d9d5241 | 2619 | cond_resched(); |
2953079c | 2620 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2621 | md_check_recovery(mddev); |
1da177e4 | 2622 | } |
e1dfa0a2 | 2623 | blk_finish_plug(&plug); |
1da177e4 LT |
2624 | } |
2625 | ||
e8096360 | 2626 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2627 | { |
2628 | int buffs; | |
2629 | ||
2630 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
afeee514 KO |
2631 | BUG_ON(mempool_initialized(&conf->r1buf_pool)); |
2632 | ||
2633 | return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, | |
2634 | r1buf_pool_free, conf->poolinfo); | |
1da177e4 LT |
2635 | } |
2636 | ||
208410b5 SL |
2637 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2638 | { | |
afeee514 | 2639 | struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); |
208410b5 SL |
2640 | struct resync_pages *rps; |
2641 | struct bio *bio; | |
2642 | int i; | |
2643 | ||
2644 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2645 | bio = r1bio->bios[i]; | |
2646 | rps = bio->bi_private; | |
a7c50c94 | 2647 | bio_reset(bio, NULL, 0); |
208410b5 SL |
2648 | bio->bi_private = rps; |
2649 | } | |
2650 | r1bio->master_bio = NULL; | |
2651 | return r1bio; | |
2652 | } | |
2653 | ||
1da177e4 LT |
2654 | /* |
2655 | * perform a "sync" on one "block" | |
2656 | * | |
2657 | * We need to make sure that no normal I/O request - particularly write | |
2658 | * requests - conflict with active sync requests. | |
2659 | * | |
2660 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2661 | * that can be installed to exclude normal IO requests. | |
2662 | */ | |
2663 | ||
849674e4 SL |
2664 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2665 | int *skipped) | |
1da177e4 | 2666 | { |
e8096360 | 2667 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2668 | struct r1bio *r1_bio; |
1da177e4 LT |
2669 | struct bio *bio; |
2670 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2671 | int disk = -1; |
1da177e4 | 2672 | int i; |
3e198f78 N |
2673 | int wonly = -1; |
2674 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2675 | sector_t sync_blocks; |
e3b9703e | 2676 | int still_degraded = 0; |
06f60385 N |
2677 | int good_sectors = RESYNC_SECTORS; |
2678 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2679 | int idx = sector_to_idx(sector_nr); |
022e510f | 2680 | int page_idx = 0; |
1da177e4 | 2681 | |
afeee514 | 2682 | if (!mempool_initialized(&conf->r1buf_pool)) |
1da177e4 | 2683 | if (init_resync(conf)) |
57afd89f | 2684 | return 0; |
1da177e4 | 2685 | |
58c0fed4 | 2686 | max_sector = mddev->dev_sectors; |
1da177e4 | 2687 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2688 | /* If we aborted, we need to abort the |
2689 | * sync on the 'current' bitmap chunk (there will | |
2690 | * only be one in raid1 resync. | |
2691 | * We can find the current addess in mddev->curr_resync | |
2692 | */ | |
6a806c51 | 2693 | if (mddev->curr_resync < max_sector) /* aborted */ |
e64e4018 AS |
2694 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
2695 | &sync_blocks, 1); | |
6a806c51 | 2696 | else /* completed sync */ |
191ea9b2 | 2697 | conf->fullsync = 0; |
6a806c51 | 2698 | |
e64e4018 | 2699 | md_bitmap_close_sync(mddev->bitmap); |
1da177e4 | 2700 | close_sync(conf); |
c40f341f GR |
2701 | |
2702 | if (mddev_is_clustered(mddev)) { | |
2703 | conf->cluster_sync_low = 0; | |
2704 | conf->cluster_sync_high = 0; | |
c40f341f | 2705 | } |
1da177e4 LT |
2706 | return 0; |
2707 | } | |
2708 | ||
07d84d10 N |
2709 | if (mddev->bitmap == NULL && |
2710 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2711 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2712 | conf->fullsync == 0) { |
2713 | *skipped = 1; | |
2714 | return max_sector - sector_nr; | |
2715 | } | |
6394cca5 N |
2716 | /* before building a request, check if we can skip these blocks.. |
2717 | * This call the bitmap_start_sync doesn't actually record anything | |
2718 | */ | |
e64e4018 | 2719 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2720 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2721 | /* We can skip this block, and probably several more */ |
2722 | *skipped = 1; | |
2723 | return sync_blocks; | |
2724 | } | |
17999be4 | 2725 | |
7ac50447 TM |
2726 | /* |
2727 | * If there is non-resync activity waiting for a turn, then let it | |
2728 | * though before starting on this new sync request. | |
2729 | */ | |
824e47da | 2730 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2731 | schedule_timeout_uninterruptible(1); |
2732 | ||
c40f341f GR |
2733 | /* we are incrementing sector_nr below. To be safe, we check against |
2734 | * sector_nr + two times RESYNC_SECTORS | |
2735 | */ | |
2736 | ||
e64e4018 | 2737 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
c40f341f | 2738 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
17999be4 | 2739 | |
8c242593 YY |
2740 | |
2741 | if (raise_barrier(conf, sector_nr)) | |
2742 | return 0; | |
2743 | ||
2744 | r1_bio = raid1_alloc_init_r1buf(conf); | |
1da177e4 | 2745 | |
3e198f78 | 2746 | rcu_read_lock(); |
1da177e4 | 2747 | /* |
3e198f78 N |
2748 | * If we get a correctably read error during resync or recovery, |
2749 | * we might want to read from a different device. So we | |
2750 | * flag all drives that could conceivably be read from for READ, | |
2751 | * and any others (which will be non-In_sync devices) for WRITE. | |
2752 | * If a read fails, we try reading from something else for which READ | |
2753 | * is OK. | |
1da177e4 | 2754 | */ |
1da177e4 | 2755 | |
1da177e4 LT |
2756 | r1_bio->mddev = mddev; |
2757 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2758 | r1_bio->state = 0; |
1da177e4 | 2759 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2760 | /* make sure good_sectors won't go across barrier unit boundary */ |
2761 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2762 | |
8f19ccb2 | 2763 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2764 | struct md_rdev *rdev; |
1da177e4 | 2765 | bio = r1_bio->bios[i]; |
1da177e4 | 2766 | |
3e198f78 N |
2767 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2768 | if (rdev == NULL || | |
06f60385 | 2769 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2770 | if (i < conf->raid_disks) |
2771 | still_degraded = 1; | |
3e198f78 | 2772 | } else if (!test_bit(In_sync, &rdev->flags)) { |
c34b7ac6 | 2773 | bio->bi_opf = REQ_OP_WRITE; |
1da177e4 LT |
2774 | bio->bi_end_io = end_sync_write; |
2775 | write_targets ++; | |
3e198f78 N |
2776 | } else { |
2777 | /* may need to read from here */ | |
06f60385 N |
2778 | sector_t first_bad = MaxSector; |
2779 | int bad_sectors; | |
2780 | ||
2781 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2782 | &first_bad, &bad_sectors)) { | |
2783 | if (first_bad > sector_nr) | |
2784 | good_sectors = first_bad - sector_nr; | |
2785 | else { | |
2786 | bad_sectors -= (sector_nr - first_bad); | |
2787 | if (min_bad == 0 || | |
2788 | min_bad > bad_sectors) | |
2789 | min_bad = bad_sectors; | |
2790 | } | |
2791 | } | |
2792 | if (sector_nr < first_bad) { | |
2793 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2794 | if (wonly < 0) | |
2795 | wonly = i; | |
2796 | } else { | |
2797 | if (disk < 0) | |
2798 | disk = i; | |
2799 | } | |
c34b7ac6 | 2800 | bio->bi_opf = REQ_OP_READ; |
06f60385 N |
2801 | bio->bi_end_io = end_sync_read; |
2802 | read_targets++; | |
d57368af AL |
2803 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2804 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2805 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2806 | /* | |
2807 | * The device is suitable for reading (InSync), | |
2808 | * but has bad block(s) here. Let's try to correct them, | |
2809 | * if we are doing resync or repair. Otherwise, leave | |
2810 | * this device alone for this sync request. | |
2811 | */ | |
c34b7ac6 | 2812 | bio->bi_opf = REQ_OP_WRITE; |
d57368af AL |
2813 | bio->bi_end_io = end_sync_write; |
2814 | write_targets++; | |
3e198f78 | 2815 | } |
3e198f78 | 2816 | } |
028288df | 2817 | if (rdev && bio->bi_end_io) { |
06f60385 | 2818 | atomic_inc(&rdev->nr_pending); |
4f024f37 | 2819 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2820 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2821 | if (test_bit(FailFast, &rdev->flags)) |
2822 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2823 | } |
1da177e4 | 2824 | } |
3e198f78 N |
2825 | rcu_read_unlock(); |
2826 | if (disk < 0) | |
2827 | disk = wonly; | |
2828 | r1_bio->read_disk = disk; | |
191ea9b2 | 2829 | |
06f60385 N |
2830 | if (read_targets == 0 && min_bad > 0) { |
2831 | /* These sectors are bad on all InSync devices, so we | |
2832 | * need to mark them bad on all write targets | |
2833 | */ | |
2834 | int ok = 1; | |
8f19ccb2 | 2835 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2836 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2837 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2838 | ok = rdev_set_badblocks(rdev, sector_nr, |
2839 | min_bad, 0 | |
2840 | ) && ok; | |
2841 | } | |
2953079c | 2842 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2843 | *skipped = 1; |
2844 | put_buf(r1_bio); | |
2845 | ||
2846 | if (!ok) { | |
2847 | /* Cannot record the badblocks, so need to | |
2848 | * abort the resync. | |
2849 | * If there are multiple read targets, could just | |
2850 | * fail the really bad ones ??? | |
2851 | */ | |
2852 | conf->recovery_disabled = mddev->recovery_disabled; | |
2853 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2854 | return 0; | |
2855 | } else | |
2856 | return min_bad; | |
2857 | ||
2858 | } | |
2859 | if (min_bad > 0 && min_bad < good_sectors) { | |
2860 | /* only resync enough to reach the next bad->good | |
2861 | * transition */ | |
2862 | good_sectors = min_bad; | |
2863 | } | |
2864 | ||
3e198f78 N |
2865 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2866 | /* extra read targets are also write targets */ | |
2867 | write_targets += read_targets-1; | |
2868 | ||
2869 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2870 | /* There is nowhere to write, so all non-sync |
2871 | * drives must be failed - so we are finished | |
2872 | */ | |
b7219ccb N |
2873 | sector_t rv; |
2874 | if (min_bad > 0) | |
2875 | max_sector = sector_nr + min_bad; | |
2876 | rv = max_sector - sector_nr; | |
57afd89f | 2877 | *skipped = 1; |
1da177e4 | 2878 | put_buf(r1_bio); |
1da177e4 LT |
2879 | return rv; |
2880 | } | |
2881 | ||
c6207277 N |
2882 | if (max_sector > mddev->resync_max) |
2883 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2884 | if (max_sector > sector_nr + good_sectors) |
2885 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2886 | nr_sectors = 0; |
289e99e8 | 2887 | sync_blocks = 0; |
1da177e4 LT |
2888 | do { |
2889 | struct page *page; | |
2890 | int len = PAGE_SIZE; | |
2891 | if (sector_nr + (len>>9) > max_sector) | |
2892 | len = (max_sector - sector_nr) << 9; | |
2893 | if (len == 0) | |
2894 | break; | |
6a806c51 | 2895 | if (sync_blocks == 0) { |
e64e4018 AS |
2896 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
2897 | &sync_blocks, still_degraded) && | |
e5de485f N |
2898 | !conf->fullsync && |
2899 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2900 | break; |
7571ae88 | 2901 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2902 | len = sync_blocks<<9; |
ab7a30c7 | 2903 | } |
191ea9b2 | 2904 | |
8f19ccb2 | 2905 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2906 | struct resync_pages *rp; |
2907 | ||
1da177e4 | 2908 | bio = r1_bio->bios[i]; |
98d30c58 | 2909 | rp = get_resync_pages(bio); |
1da177e4 | 2910 | if (bio->bi_end_io) { |
022e510f | 2911 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2912 | |
2913 | /* | |
2914 | * won't fail because the vec table is big | |
2915 | * enough to hold all these pages | |
2916 | */ | |
2917 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
2918 | } |
2919 | } | |
2920 | nr_sectors += len>>9; | |
2921 | sector_nr += len>>9; | |
191ea9b2 | 2922 | sync_blocks -= (len>>9); |
022e510f | 2923 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2924 | |
1da177e4 LT |
2925 | r1_bio->sectors = nr_sectors; |
2926 | ||
c40f341f GR |
2927 | if (mddev_is_clustered(mddev) && |
2928 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2929 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2930 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2931 | /* Send resync message */ | |
2932 | md_cluster_ops->resync_info_update(mddev, | |
2933 | conf->cluster_sync_low, | |
2934 | conf->cluster_sync_high); | |
2935 | } | |
2936 | ||
d11c171e N |
2937 | /* For a user-requested sync, we read all readable devices and do a |
2938 | * compare | |
2939 | */ | |
2940 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2941 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2942 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2943 | bio = r1_bio->bios[i]; |
2944 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2945 | read_targets--; |
74d46992 | 2946 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2947 | if (read_targets == 1) |
2948 | bio->bi_opf &= ~MD_FAILFAST; | |
ed00aabd | 2949 | submit_bio_noacct(bio); |
d11c171e N |
2950 | } |
2951 | } | |
2952 | } else { | |
2953 | atomic_set(&r1_bio->remaining, 1); | |
2954 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2955 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2956 | if (read_targets == 1) |
2957 | bio->bi_opf &= ~MD_FAILFAST; | |
ed00aabd | 2958 | submit_bio_noacct(bio); |
d11c171e | 2959 | } |
1da177e4 LT |
2960 | return nr_sectors; |
2961 | } | |
2962 | ||
fd01b88c | 2963 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2964 | { |
2965 | if (sectors) | |
2966 | return sectors; | |
2967 | ||
2968 | return mddev->dev_sectors; | |
2969 | } | |
2970 | ||
e8096360 | 2971 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2972 | { |
e8096360 | 2973 | struct r1conf *conf; |
709ae487 | 2974 | int i; |
0eaf822c | 2975 | struct raid1_info *disk; |
3cb03002 | 2976 | struct md_rdev *rdev; |
709ae487 | 2977 | int err = -ENOMEM; |
1da177e4 | 2978 | |
e8096360 | 2979 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2980 | if (!conf) |
709ae487 | 2981 | goto abort; |
1da177e4 | 2982 | |
fd76863e | 2983 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2984 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2985 | if (!conf->nr_pending) |
2986 | goto abort; | |
2987 | ||
2988 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2989 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2990 | if (!conf->nr_waiting) |
2991 | goto abort; | |
2992 | ||
2993 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2994 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2995 | if (!conf->nr_queued) |
2996 | goto abort; | |
2997 | ||
2998 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2999 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 3000 | if (!conf->barrier) |
3001 | goto abort; | |
3002 | ||
6396bb22 KC |
3003 | conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
3004 | mddev->raid_disks, 2), | |
3005 | GFP_KERNEL); | |
1da177e4 | 3006 | if (!conf->mirrors) |
709ae487 | 3007 | goto abort; |
1da177e4 | 3008 | |
ddaf22ab N |
3009 | conf->tmppage = alloc_page(GFP_KERNEL); |
3010 | if (!conf->tmppage) | |
709ae487 | 3011 | goto abort; |
ddaf22ab | 3012 | |
709ae487 | 3013 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 3014 | if (!conf->poolinfo) |
709ae487 | 3015 | goto abort; |
8f19ccb2 | 3016 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
3f677f9c | 3017 | err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 3018 | rbio_pool_free, conf->poolinfo); |
afeee514 | 3019 | if (err) |
709ae487 N |
3020 | goto abort; |
3021 | ||
afeee514 KO |
3022 | err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
3023 | if (err) | |
c230e7e5 N |
3024 | goto abort; |
3025 | ||
ed9bfdf1 | 3026 | conf->poolinfo->mddev = mddev; |
1da177e4 | 3027 | |
c19d5798 | 3028 | err = -EINVAL; |
e7e72bf6 | 3029 | spin_lock_init(&conf->device_lock); |
dafb20fa | 3030 | rdev_for_each(rdev, mddev) { |
709ae487 | 3031 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
3032 | if (disk_idx >= mddev->raid_disks |
3033 | || disk_idx < 0) | |
3034 | continue; | |
c19d5798 | 3035 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 3036 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
3037 | else |
3038 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 3039 | |
c19d5798 N |
3040 | if (disk->rdev) |
3041 | goto abort; | |
1da177e4 | 3042 | disk->rdev = rdev; |
1da177e4 | 3043 | disk->head_position = 0; |
12cee5a8 | 3044 | disk->seq_start = MaxSector; |
1da177e4 LT |
3045 | } |
3046 | conf->raid_disks = mddev->raid_disks; | |
3047 | conf->mddev = mddev; | |
1da177e4 | 3048 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 3049 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
3050 | |
3051 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 3052 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 3053 | |
191ea9b2 | 3054 | bio_list_init(&conf->pending_bio_list); |
d890fa2b | 3055 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 3056 | |
c19d5798 | 3057 | err = -EIO; |
8f19ccb2 | 3058 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
3059 | |
3060 | disk = conf->mirrors + i; | |
3061 | ||
c19d5798 N |
3062 | if (i < conf->raid_disks && |
3063 | disk[conf->raid_disks].rdev) { | |
3064 | /* This slot has a replacement. */ | |
3065 | if (!disk->rdev) { | |
3066 | /* No original, just make the replacement | |
3067 | * a recovering spare | |
3068 | */ | |
3069 | disk->rdev = | |
3070 | disk[conf->raid_disks].rdev; | |
3071 | disk[conf->raid_disks].rdev = NULL; | |
3072 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
3073 | /* Original is not in_sync - bad */ | |
3074 | goto abort; | |
3075 | } | |
3076 | ||
5fd6c1dc N |
3077 | if (!disk->rdev || |
3078 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3079 | disk->head_position = 0; |
4f0a5e01 JB |
3080 | if (disk->rdev && |
3081 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3082 | conf->fullsync = 1; |
be4d3280 | 3083 | } |
1da177e4 | 3084 | } |
709ae487 | 3085 | |
709ae487 | 3086 | err = -ENOMEM; |
0232605d | 3087 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 3088 | if (!conf->thread) |
709ae487 | 3089 | goto abort; |
1da177e4 | 3090 | |
709ae487 N |
3091 | return conf; |
3092 | ||
3093 | abort: | |
3094 | if (conf) { | |
afeee514 | 3095 | mempool_exit(&conf->r1bio_pool); |
709ae487 N |
3096 | kfree(conf->mirrors); |
3097 | safe_put_page(conf->tmppage); | |
3098 | kfree(conf->poolinfo); | |
fd76863e | 3099 | kfree(conf->nr_pending); |
3100 | kfree(conf->nr_waiting); | |
3101 | kfree(conf->nr_queued); | |
3102 | kfree(conf->barrier); | |
afeee514 | 3103 | bioset_exit(&conf->bio_split); |
709ae487 N |
3104 | kfree(conf); |
3105 | } | |
3106 | return ERR_PTR(err); | |
3107 | } | |
3108 | ||
afa0f557 | 3109 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3110 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3111 | { |
e8096360 | 3112 | struct r1conf *conf; |
709ae487 | 3113 | int i; |
3cb03002 | 3114 | struct md_rdev *rdev; |
5220ea1e | 3115 | int ret; |
709ae487 N |
3116 | |
3117 | if (mddev->level != 1) { | |
1d41c216 N |
3118 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3119 | mdname(mddev), mddev->level); | |
709ae487 N |
3120 | return -EIO; |
3121 | } | |
3122 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3123 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3124 | mdname(mddev)); | |
709ae487 N |
3125 | return -EIO; |
3126 | } | |
a415c0f1 N |
3127 | if (mddev_init_writes_pending(mddev) < 0) |
3128 | return -ENOMEM; | |
1da177e4 | 3129 | /* |
709ae487 N |
3130 | * copy the already verified devices into our private RAID1 |
3131 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3132 | * should be freed in raid1_free()] |
1da177e4 | 3133 | */ |
709ae487 N |
3134 | if (mddev->private == NULL) |
3135 | conf = setup_conf(mddev); | |
3136 | else | |
3137 | conf = mddev->private; | |
1da177e4 | 3138 | |
709ae487 N |
3139 | if (IS_ERR(conf)) |
3140 | return PTR_ERR(conf); | |
1da177e4 | 3141 | |
10fa225c | 3142 | if (mddev->queue) |
3deff1a7 | 3143 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 3144 | |
dafb20fa | 3145 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3146 | if (!mddev->gendisk) |
3147 | continue; | |
709ae487 N |
3148 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3149 | rdev->data_offset << 9); | |
1da177e4 | 3150 | } |
191ea9b2 | 3151 | |
709ae487 | 3152 | mddev->degraded = 0; |
ebfeb444 | 3153 | for (i = 0; i < conf->raid_disks; i++) |
709ae487 N |
3154 | if (conf->mirrors[i].rdev == NULL || |
3155 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3156 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3157 | mddev->degraded++; | |
07f1a685 YY |
3158 | /* |
3159 | * RAID1 needs at least one disk in active | |
3160 | */ | |
3161 | if (conf->raid_disks - mddev->degraded < 1) { | |
b611ad14 | 3162 | md_unregister_thread(&conf->thread); |
07f1a685 YY |
3163 | ret = -EINVAL; |
3164 | goto abort; | |
3165 | } | |
709ae487 N |
3166 | |
3167 | if (conf->raid_disks - mddev->degraded == 1) | |
3168 | mddev->recovery_cp = MaxSector; | |
3169 | ||
8c6ac868 | 3170 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3171 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3172 | mdname(mddev)); | |
3173 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3174 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3175 | mddev->raid_disks); |
709ae487 | 3176 | |
1da177e4 LT |
3177 | /* |
3178 | * Ok, everything is just fine now | |
3179 | */ | |
709ae487 N |
3180 | mddev->thread = conf->thread; |
3181 | conf->thread = NULL; | |
3182 | mddev->private = conf; | |
46533ff7 | 3183 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3184 | |
1f403624 | 3185 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3186 | |
ebfeb444 | 3187 | ret = md_integrity_register(mddev); |
5aa61f42 N |
3188 | if (ret) { |
3189 | md_unregister_thread(&mddev->thread); | |
07f1a685 | 3190 | goto abort; |
5aa61f42 | 3191 | } |
07f1a685 YY |
3192 | return 0; |
3193 | ||
3194 | abort: | |
3195 | raid1_free(mddev, conf); | |
5220ea1e | 3196 | return ret; |
1da177e4 LT |
3197 | } |
3198 | ||
afa0f557 | 3199 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3200 | { |
afa0f557 | 3201 | struct r1conf *conf = priv; |
409c57f3 | 3202 | |
afeee514 | 3203 | mempool_exit(&conf->r1bio_pool); |
990a8baf | 3204 | kfree(conf->mirrors); |
0fea7ed8 | 3205 | safe_put_page(conf->tmppage); |
990a8baf | 3206 | kfree(conf->poolinfo); |
fd76863e | 3207 | kfree(conf->nr_pending); |
3208 | kfree(conf->nr_waiting); | |
3209 | kfree(conf->nr_queued); | |
3210 | kfree(conf->barrier); | |
afeee514 | 3211 | bioset_exit(&conf->bio_split); |
1da177e4 | 3212 | kfree(conf); |
1da177e4 LT |
3213 | } |
3214 | ||
fd01b88c | 3215 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3216 | { |
3217 | /* no resync is happening, and there is enough space | |
3218 | * on all devices, so we can resize. | |
3219 | * We need to make sure resync covers any new space. | |
3220 | * If the array is shrinking we should possibly wait until | |
3221 | * any io in the removed space completes, but it hardly seems | |
3222 | * worth it. | |
3223 | */ | |
a4a6125a N |
3224 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3225 | if (mddev->external_size && | |
3226 | mddev->array_sectors > newsize) | |
b522adcd | 3227 | return -EINVAL; |
a4a6125a | 3228 | if (mddev->bitmap) { |
e64e4018 | 3229 | int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
a4a6125a N |
3230 | if (ret) |
3231 | return ret; | |
3232 | } | |
3233 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3234 | if (sectors > mddev->dev_sectors && |
b098636c | 3235 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3236 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3237 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3238 | } | |
b522adcd | 3239 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3240 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3241 | return 0; |
3242 | } | |
3243 | ||
fd01b88c | 3244 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3245 | { |
3246 | /* We need to: | |
3247 | * 1/ resize the r1bio_pool | |
3248 | * 2/ resize conf->mirrors | |
3249 | * | |
3250 | * We allocate a new r1bio_pool if we can. | |
3251 | * Then raise a device barrier and wait until all IO stops. | |
3252 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3253 | * |
3254 | * At the same time, we "pack" the devices so that all the missing | |
3255 | * devices have the higher raid_disk numbers. | |
1da177e4 | 3256 | */ |
afeee514 | 3257 | mempool_t newpool, oldpool; |
1da177e4 | 3258 | struct pool_info *newpoolinfo; |
0eaf822c | 3259 | struct raid1_info *newmirrors; |
e8096360 | 3260 | struct r1conf *conf = mddev->private; |
63c70c4f | 3261 | int cnt, raid_disks; |
c04be0aa | 3262 | unsigned long flags; |
2214c260 | 3263 | int d, d2; |
afeee514 KO |
3264 | int ret; |
3265 | ||
3266 | memset(&newpool, 0, sizeof(newpool)); | |
3267 | memset(&oldpool, 0, sizeof(oldpool)); | |
1da177e4 | 3268 | |
63c70c4f | 3269 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3270 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3271 | mddev->layout != mddev->new_layout || |
3272 | mddev->level != mddev->new_level) { | |
664e7c41 | 3273 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3274 | mddev->new_layout = mddev->layout; |
3275 | mddev->new_level = mddev->level; | |
3276 | return -EINVAL; | |
3277 | } | |
3278 | ||
2214c260 AP |
3279 | if (!mddev_is_clustered(mddev)) |
3280 | md_allow_write(mddev); | |
2a2275d6 | 3281 | |
63c70c4f N |
3282 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3283 | ||
6ea9c07c N |
3284 | if (raid_disks < conf->raid_disks) { |
3285 | cnt=0; | |
3286 | for (d= 0; d < conf->raid_disks; d++) | |
3287 | if (conf->mirrors[d].rdev) | |
3288 | cnt++; | |
3289 | if (cnt > raid_disks) | |
1da177e4 | 3290 | return -EBUSY; |
6ea9c07c | 3291 | } |
1da177e4 LT |
3292 | |
3293 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3294 | if (!newpoolinfo) | |
3295 | return -ENOMEM; | |
3296 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3297 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 | 3298 | |
3f677f9c | 3299 | ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 3300 | rbio_pool_free, newpoolinfo); |
afeee514 | 3301 | if (ret) { |
1da177e4 | 3302 | kfree(newpoolinfo); |
afeee514 | 3303 | return ret; |
1da177e4 | 3304 | } |
6396bb22 KC |
3305 | newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
3306 | raid_disks, 2), | |
8f19ccb2 | 3307 | GFP_KERNEL); |
1da177e4 LT |
3308 | if (!newmirrors) { |
3309 | kfree(newpoolinfo); | |
afeee514 | 3310 | mempool_exit(&newpool); |
1da177e4 LT |
3311 | return -ENOMEM; |
3312 | } | |
1da177e4 | 3313 | |
e2d59925 | 3314 | freeze_array(conf, 0); |
1da177e4 LT |
3315 | |
3316 | /* ok, everything is stopped */ | |
3317 | oldpool = conf->r1bio_pool; | |
3318 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3319 | |
a88aa786 | 3320 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3321 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3322 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3323 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3324 | rdev->raid_disk = d2; |
36fad858 NK |
3325 | sysfs_unlink_rdev(mddev, rdev); |
3326 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3327 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3328 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3329 | } |
a88aa786 N |
3330 | if (rdev) |
3331 | newmirrors[d2++].rdev = rdev; | |
3332 | } | |
1da177e4 LT |
3333 | kfree(conf->mirrors); |
3334 | conf->mirrors = newmirrors; | |
3335 | kfree(conf->poolinfo); | |
3336 | conf->poolinfo = newpoolinfo; | |
3337 | ||
c04be0aa | 3338 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3339 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3340 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3341 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3342 | mddev->delta_disks = 0; |
1da177e4 | 3343 | |
e2d59925 | 3344 | unfreeze_array(conf); |
1da177e4 | 3345 | |
985ca973 | 3346 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3347 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3348 | md_wakeup_thread(mddev->thread); | |
3349 | ||
afeee514 | 3350 | mempool_exit(&oldpool); |
1da177e4 LT |
3351 | return 0; |
3352 | } | |
3353 | ||
b03e0ccb | 3354 | static void raid1_quiesce(struct mddev *mddev, int quiesce) |
36fa3063 | 3355 | { |
e8096360 | 3356 | struct r1conf *conf = mddev->private; |
36fa3063 | 3357 | |
b03e0ccb | 3358 | if (quiesce) |
07169fd4 | 3359 | freeze_array(conf, 0); |
b03e0ccb | 3360 | else |
07169fd4 | 3361 | unfreeze_array(conf); |
36fa3063 N |
3362 | } |
3363 | ||
fd01b88c | 3364 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3365 | { |
3366 | /* raid1 can take over: | |
3367 | * raid5 with 2 devices, any layout or chunk size | |
3368 | */ | |
3369 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3370 | struct r1conf *conf; |
709ae487 N |
3371 | mddev->new_level = 1; |
3372 | mddev->new_layout = 0; | |
3373 | mddev->new_chunk_sectors = 0; | |
3374 | conf = setup_conf(mddev); | |
6995f0b2 | 3375 | if (!IS_ERR(conf)) { |
07169fd4 | 3376 | /* Array must appear to be quiesced */ |
3377 | conf->array_frozen = 1; | |
394ed8e4 SL |
3378 | mddev_clear_unsupported_flags(mddev, |
3379 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3380 | } |
709ae487 N |
3381 | return conf; |
3382 | } | |
3383 | return ERR_PTR(-EINVAL); | |
3384 | } | |
1da177e4 | 3385 | |
84fc4b56 | 3386 | static struct md_personality raid1_personality = |
1da177e4 LT |
3387 | { |
3388 | .name = "raid1", | |
2604b703 | 3389 | .level = 1, |
1da177e4 | 3390 | .owner = THIS_MODULE, |
849674e4 SL |
3391 | .make_request = raid1_make_request, |
3392 | .run = raid1_run, | |
afa0f557 | 3393 | .free = raid1_free, |
849674e4 SL |
3394 | .status = raid1_status, |
3395 | .error_handler = raid1_error, | |
1da177e4 LT |
3396 | .hot_add_disk = raid1_add_disk, |
3397 | .hot_remove_disk= raid1_remove_disk, | |
3398 | .spare_active = raid1_spare_active, | |
849674e4 | 3399 | .sync_request = raid1_sync_request, |
1da177e4 | 3400 | .resize = raid1_resize, |
80c3a6ce | 3401 | .size = raid1_size, |
63c70c4f | 3402 | .check_reshape = raid1_reshape, |
36fa3063 | 3403 | .quiesce = raid1_quiesce, |
709ae487 | 3404 | .takeover = raid1_takeover, |
1da177e4 LT |
3405 | }; |
3406 | ||
3407 | static int __init raid_init(void) | |
3408 | { | |
2604b703 | 3409 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3410 | } |
3411 | ||
3412 | static void raid_exit(void) | |
3413 | { | |
2604b703 | 3414 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3415 | } |
3416 | ||
3417 | module_init(raid_init); | |
3418 | module_exit(raid_exit); | |
3419 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3420 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3421 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3422 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3423 | MODULE_ALIAS("md-level-1"); |