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 | |
37011e3a | 307 | bio_endio(bio); |
d2eb35ac N |
308 | } |
309 | ||
9f2c9d12 | 310 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
311 | { |
312 | struct bio *bio = r1_bio->master_bio; | |
c91114c2 | 313 | struct r1conf *conf = r1_bio->mddev->private; |
c5d736f5 | 314 | sector_t sector = r1_bio->sector; |
1da177e4 | 315 | |
4b6d287f N |
316 | /* if nobody has done the final endio yet, do it now */ |
317 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
318 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
319 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
320 | (unsigned long long) bio->bi_iter.bi_sector, |
321 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 322 | |
d2eb35ac | 323 | call_bio_endio(r1_bio); |
4b6d287f | 324 | } |
c5d736f5 XH |
325 | |
326 | free_r1bio(r1_bio); | |
c91114c2 DJ |
327 | /* |
328 | * Wake up any possible resync thread that waits for the device | |
329 | * to go idle. All I/Os, even write-behind writes, are done. | |
330 | */ | |
c5d736f5 | 331 | allow_barrier(conf, sector); |
1da177e4 LT |
332 | } |
333 | ||
334 | /* | |
335 | * Update disk head position estimator based on IRQ completion info. | |
336 | */ | |
9f2c9d12 | 337 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 338 | { |
e8096360 | 339 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
340 | |
341 | conf->mirrors[disk].head_position = | |
342 | r1_bio->sector + (r1_bio->sectors); | |
343 | } | |
344 | ||
ba3ae3be NK |
345 | /* |
346 | * Find the disk number which triggered given bio | |
347 | */ | |
9f2c9d12 | 348 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
349 | { |
350 | int mirror; | |
30194636 N |
351 | struct r1conf *conf = r1_bio->mddev->private; |
352 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 353 | |
8f19ccb2 | 354 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
355 | if (r1_bio->bios[mirror] == bio) |
356 | break; | |
357 | ||
8f19ccb2 | 358 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
359 | update_head_pos(mirror, r1_bio); |
360 | ||
361 | return mirror; | |
362 | } | |
363 | ||
4246a0b6 | 364 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 365 | { |
4e4cbee9 | 366 | int uptodate = !bio->bi_status; |
9f2c9d12 | 367 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 368 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 369 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 370 | |
1da177e4 LT |
371 | /* |
372 | * this branch is our 'one mirror IO has finished' event handler: | |
373 | */ | |
e5872d58 | 374 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 375 | |
dd00a99e N |
376 | if (uptodate) |
377 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
2e52d449 N |
378 | else if (test_bit(FailFast, &rdev->flags) && |
379 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
380 | /* This was a fail-fast read so we definitely | |
381 | * want to retry */ | |
382 | ; | |
dd00a99e N |
383 | else { |
384 | /* If all other devices have failed, we want to return | |
385 | * the error upwards rather than fail the last device. | |
386 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 387 | */ |
dd00a99e N |
388 | unsigned long flags; |
389 | spin_lock_irqsave(&conf->device_lock, flags); | |
390 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
391 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 392 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
393 | uptodate = 1; |
394 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
395 | } | |
1da177e4 | 396 | |
7ad4d4a6 | 397 | if (uptodate) { |
1da177e4 | 398 | raid_end_bio_io(r1_bio); |
e5872d58 | 399 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 400 | } else { |
1da177e4 LT |
401 | /* |
402 | * oops, read error: | |
403 | */ | |
913cce5a | 404 | pr_err_ratelimited("md/raid1:%s: %pg: rescheduling sector %llu\n", |
1d41c216 | 405 | mdname(conf->mddev), |
913cce5a | 406 | rdev->bdev, |
1d41c216 | 407 | (unsigned long long)r1_bio->sector); |
d2eb35ac | 408 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 409 | reschedule_retry(r1_bio); |
7ad4d4a6 | 410 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 411 | } |
1da177e4 LT |
412 | } |
413 | ||
9f2c9d12 | 414 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
415 | { |
416 | /* it really is the end of this request */ | |
417 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
841c1316 ML |
418 | bio_free_pages(r1_bio->behind_master_bio); |
419 | bio_put(r1_bio->behind_master_bio); | |
420 | r1_bio->behind_master_bio = NULL; | |
cd5ff9a1 N |
421 | } |
422 | /* clear the bitmap if all writes complete successfully */ | |
e64e4018 AS |
423 | md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, |
424 | r1_bio->sectors, | |
425 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
426 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
cd5ff9a1 N |
427 | md_write_end(r1_bio->mddev); |
428 | } | |
429 | ||
9f2c9d12 | 430 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 431 | { |
cd5ff9a1 N |
432 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
433 | return; | |
434 | ||
435 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
436 | reschedule_retry(r1_bio); | |
437 | else { | |
438 | close_write(r1_bio); | |
4367af55 N |
439 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
440 | reschedule_retry(r1_bio); | |
441 | else | |
442 | raid_end_bio_io(r1_bio); | |
4e78064f N |
443 | } |
444 | } | |
445 | ||
4246a0b6 | 446 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 447 | { |
9f2c9d12 | 448 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 449 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 450 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 451 | struct bio *to_put = NULL; |
e5872d58 N |
452 | int mirror = find_bio_disk(r1_bio, bio); |
453 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd | 454 | bool discard_error; |
69df9cfc GJ |
455 | sector_t lo = r1_bio->sector; |
456 | sector_t hi = r1_bio->sector + r1_bio->sectors; | |
e3f948cd | 457 | |
4e4cbee9 | 458 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 459 | |
e9c7469b TH |
460 | /* |
461 | * 'one mirror IO has finished' event handler: | |
462 | */ | |
4e4cbee9 | 463 | if (bio->bi_status && !discard_error) { |
e5872d58 N |
464 | set_bit(WriteErrorSeen, &rdev->flags); |
465 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
466 | set_bit(MD_RECOVERY_NEEDED, & |
467 | conf->mddev->recovery); | |
468 | ||
212e7eb7 N |
469 | if (test_bit(FailFast, &rdev->flags) && |
470 | (bio->bi_opf & MD_FAILFAST) && | |
471 | /* We never try FailFast to WriteMostly devices */ | |
472 | !test_bit(WriteMostly, &rdev->flags)) { | |
473 | md_error(r1_bio->mddev, rdev); | |
eeba6809 YY |
474 | } |
475 | ||
476 | /* | |
477 | * When the device is faulty, it is not necessary to | |
478 | * handle write error. | |
eeba6809 YY |
479 | */ |
480 | if (!test_bit(Faulty, &rdev->flags)) | |
212e7eb7 | 481 | set_bit(R1BIO_WriteError, &r1_bio->state); |
eeba6809 | 482 | else { |
2417b986 PC |
483 | /* Fail the request */ |
484 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
eeba6809 YY |
485 | /* Finished with this branch */ |
486 | r1_bio->bios[mirror] = NULL; | |
487 | to_put = bio; | |
488 | } | |
4367af55 | 489 | } else { |
1da177e4 | 490 | /* |
e9c7469b TH |
491 | * Set R1BIO_Uptodate in our master bio, so that we |
492 | * will return a good error code for to the higher | |
493 | * levels even if IO on some other mirrored buffer | |
494 | * fails. | |
495 | * | |
496 | * The 'master' represents the composite IO operation | |
497 | * to user-side. So if something waits for IO, then it | |
498 | * will wait for the 'master' bio. | |
1da177e4 | 499 | */ |
4367af55 N |
500 | sector_t first_bad; |
501 | int bad_sectors; | |
502 | ||
cd5ff9a1 N |
503 | r1_bio->bios[mirror] = NULL; |
504 | to_put = bio; | |
3056e3ae AL |
505 | /* |
506 | * Do not set R1BIO_Uptodate if the current device is | |
507 | * rebuilding or Faulty. This is because we cannot use | |
508 | * such device for properly reading the data back (we could | |
509 | * potentially use it, if the current write would have felt | |
510 | * before rdev->recovery_offset, but for simplicity we don't | |
511 | * check this here. | |
512 | */ | |
e5872d58 N |
513 | if (test_bit(In_sync, &rdev->flags) && |
514 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 515 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 516 | |
4367af55 | 517 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 518 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 519 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
520 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
521 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
522 | } | |
523 | } | |
524 | ||
e9c7469b | 525 | if (behind) { |
69df9cfc | 526 | if (test_bit(CollisionCheck, &rdev->flags)) |
404659cf | 527 | remove_serial(rdev, lo, hi); |
e5872d58 | 528 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
529 | atomic_dec(&r1_bio->behind_remaining); |
530 | ||
531 | /* | |
532 | * In behind mode, we ACK the master bio once the I/O | |
533 | * has safely reached all non-writemostly | |
534 | * disks. Setting the Returned bit ensures that this | |
535 | * gets done only once -- we don't ever want to return | |
536 | * -EIO here, instead we'll wait | |
537 | */ | |
538 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
539 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
540 | /* Maybe we can return now */ | |
541 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
542 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
543 | pr_debug("raid1: behind end write sectors" |
544 | " %llu-%llu\n", | |
4f024f37 KO |
545 | (unsigned long long) mbio->bi_iter.bi_sector, |
546 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 547 | call_bio_endio(r1_bio); |
4b6d287f N |
548 | } |
549 | } | |
69df9cfc GJ |
550 | } else if (rdev->mddev->serialize_policy) |
551 | remove_serial(rdev, lo, hi); | |
4367af55 | 552 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 553 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 554 | |
1da177e4 | 555 | /* |
1da177e4 LT |
556 | * Let's see if all mirrored write operations have finished |
557 | * already. | |
558 | */ | |
af6d7b76 | 559 | r1_bio_write_done(r1_bio); |
c70810b3 | 560 | |
04b857f7 N |
561 | if (to_put) |
562 | bio_put(to_put); | |
1da177e4 LT |
563 | } |
564 | ||
fd76863e | 565 | static sector_t align_to_barrier_unit_end(sector_t start_sector, |
566 | sector_t sectors) | |
567 | { | |
568 | sector_t len; | |
569 | ||
570 | WARN_ON(sectors == 0); | |
571 | /* | |
572 | * len is the number of sectors from start_sector to end of the | |
573 | * barrier unit which start_sector belongs to. | |
574 | */ | |
575 | len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - | |
576 | start_sector; | |
577 | ||
578 | if (len > sectors) | |
579 | len = sectors; | |
580 | ||
581 | return len; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | /* |
585 | * This routine returns the disk from which the requested read should | |
586 | * be done. There is a per-array 'next expected sequential IO' sector | |
587 | * number - if this matches on the next IO then we use the last disk. | |
588 | * There is also a per-disk 'last know head position' sector that is | |
589 | * maintained from IRQ contexts, both the normal and the resync IO | |
590 | * completion handlers update this position correctly. If there is no | |
591 | * perfect sequential match then we pick the disk whose head is closest. | |
592 | * | |
593 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
594 | * because position is mirror, not device based. | |
595 | * | |
596 | * The rdev for the device selected will have nr_pending incremented. | |
597 | */ | |
e8096360 | 598 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 599 | { |
af3a2cd6 | 600 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
601 | int sectors; |
602 | int best_good_sectors; | |
9dedf603 SL |
603 | int best_disk, best_dist_disk, best_pending_disk; |
604 | int has_nonrot_disk; | |
be4d3280 | 605 | int disk; |
76073054 | 606 | sector_t best_dist; |
9dedf603 | 607 | unsigned int min_pending; |
3cb03002 | 608 | struct md_rdev *rdev; |
f3ac8bf7 | 609 | int choose_first; |
12cee5a8 | 610 | int choose_next_idle; |
1da177e4 | 611 | |
1da177e4 | 612 | /* |
8ddf9efe | 613 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
614 | * device if no resync is going on, or below the resync window. |
615 | * We take the first readable disk when above the resync window. | |
616 | */ | |
617 | retry: | |
d2eb35ac | 618 | sectors = r1_bio->sectors; |
76073054 | 619 | best_disk = -1; |
9dedf603 | 620 | best_dist_disk = -1; |
76073054 | 621 | best_dist = MaxSector; |
9dedf603 SL |
622 | best_pending_disk = -1; |
623 | min_pending = UINT_MAX; | |
d2eb35ac | 624 | best_good_sectors = 0; |
9dedf603 | 625 | has_nonrot_disk = 0; |
12cee5a8 | 626 | choose_next_idle = 0; |
2e52d449 | 627 | clear_bit(R1BIO_FailFast, &r1_bio->state); |
d2eb35ac | 628 | |
7d49ffcf GR |
629 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
630 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 631 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
632 | this_sector + sectors))) |
633 | choose_first = 1; | |
634 | else | |
635 | choose_first = 0; | |
1da177e4 | 636 | |
be4d3280 | 637 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 638 | sector_t dist; |
d2eb35ac N |
639 | sector_t first_bad; |
640 | int bad_sectors; | |
9dedf603 | 641 | unsigned int pending; |
12cee5a8 | 642 | bool nonrot; |
d2eb35ac | 643 | |
2d32777d | 644 | rdev = conf->mirrors[disk].rdev; |
f3ac8bf7 N |
645 | if (r1_bio->bios[disk] == IO_BLOCKED |
646 | || rdev == NULL | |
76073054 | 647 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 648 | continue; |
76073054 N |
649 | if (!test_bit(In_sync, &rdev->flags) && |
650 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 651 | continue; |
76073054 N |
652 | if (test_bit(WriteMostly, &rdev->flags)) { |
653 | /* Don't balance among write-mostly, just | |
654 | * use the first as a last resort */ | |
d1901ef0 | 655 | if (best_dist_disk < 0) { |
307729c8 N |
656 | if (is_badblock(rdev, this_sector, sectors, |
657 | &first_bad, &bad_sectors)) { | |
816b0acf | 658 | if (first_bad <= this_sector) |
307729c8 N |
659 | /* Cannot use this */ |
660 | continue; | |
661 | best_good_sectors = first_bad - this_sector; | |
662 | } else | |
663 | best_good_sectors = sectors; | |
d1901ef0 TH |
664 | best_dist_disk = disk; |
665 | best_pending_disk = disk; | |
307729c8 | 666 | } |
76073054 N |
667 | continue; |
668 | } | |
669 | /* This is a reasonable device to use. It might | |
670 | * even be best. | |
671 | */ | |
d2eb35ac N |
672 | if (is_badblock(rdev, this_sector, sectors, |
673 | &first_bad, &bad_sectors)) { | |
674 | if (best_dist < MaxSector) | |
675 | /* already have a better device */ | |
676 | continue; | |
677 | if (first_bad <= this_sector) { | |
678 | /* cannot read here. If this is the 'primary' | |
679 | * device, then we must not read beyond | |
680 | * bad_sectors from another device.. | |
681 | */ | |
682 | bad_sectors -= (this_sector - first_bad); | |
683 | if (choose_first && sectors > bad_sectors) | |
684 | sectors = bad_sectors; | |
685 | if (best_good_sectors > sectors) | |
686 | best_good_sectors = sectors; | |
687 | ||
688 | } else { | |
689 | sector_t good_sectors = first_bad - this_sector; | |
690 | if (good_sectors > best_good_sectors) { | |
691 | best_good_sectors = good_sectors; | |
692 | best_disk = disk; | |
693 | } | |
694 | if (choose_first) | |
695 | break; | |
696 | } | |
697 | continue; | |
d82dd0e3 TM |
698 | } else { |
699 | if ((sectors > best_good_sectors) && (best_disk >= 0)) | |
700 | best_disk = -1; | |
d2eb35ac | 701 | best_good_sectors = sectors; |
d82dd0e3 | 702 | } |
d2eb35ac | 703 | |
2e52d449 N |
704 | if (best_disk >= 0) |
705 | /* At least two disks to choose from so failfast is OK */ | |
706 | set_bit(R1BIO_FailFast, &r1_bio->state); | |
707 | ||
10f0d2a5 | 708 | nonrot = bdev_nonrot(rdev->bdev); |
12cee5a8 | 709 | has_nonrot_disk |= nonrot; |
9dedf603 | 710 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 711 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 712 | if (choose_first) { |
76073054 | 713 | best_disk = disk; |
1da177e4 LT |
714 | break; |
715 | } | |
12cee5a8 SL |
716 | /* Don't change to another disk for sequential reads */ |
717 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
718 | || dist == 0) { | |
719 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
720 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
721 | ||
722 | best_disk = disk; | |
723 | /* | |
724 | * If buffered sequential IO size exceeds optimal | |
725 | * iosize, check if there is idle disk. If yes, choose | |
726 | * the idle disk. read_balance could already choose an | |
727 | * idle disk before noticing it's a sequential IO in | |
728 | * this disk. This doesn't matter because this disk | |
729 | * will idle, next time it will be utilized after the | |
730 | * first disk has IO size exceeds optimal iosize. In | |
731 | * this way, iosize of the first disk will be optimal | |
732 | * iosize at least. iosize of the second disk might be | |
733 | * small, but not a big deal since when the second disk | |
734 | * starts IO, the first disk is likely still busy. | |
735 | */ | |
736 | if (nonrot && opt_iosize > 0 && | |
737 | mirror->seq_start != MaxSector && | |
738 | mirror->next_seq_sect > opt_iosize && | |
739 | mirror->next_seq_sect - opt_iosize >= | |
740 | mirror->seq_start) { | |
741 | choose_next_idle = 1; | |
742 | continue; | |
743 | } | |
744 | break; | |
745 | } | |
12cee5a8 SL |
746 | |
747 | if (choose_next_idle) | |
748 | continue; | |
9dedf603 SL |
749 | |
750 | if (min_pending > pending) { | |
751 | min_pending = pending; | |
752 | best_pending_disk = disk; | |
753 | } | |
754 | ||
76073054 N |
755 | if (dist < best_dist) { |
756 | best_dist = dist; | |
9dedf603 | 757 | best_dist_disk = disk; |
1da177e4 | 758 | } |
f3ac8bf7 | 759 | } |
1da177e4 | 760 | |
9dedf603 SL |
761 | /* |
762 | * If all disks are rotational, choose the closest disk. If any disk is | |
763 | * non-rotational, choose the disk with less pending request even the | |
764 | * disk is rotational, which might/might not be optimal for raids with | |
765 | * mixed ratation/non-rotational disks depending on workload. | |
766 | */ | |
767 | if (best_disk == -1) { | |
2e52d449 | 768 | if (has_nonrot_disk || min_pending == 0) |
9dedf603 SL |
769 | best_disk = best_pending_disk; |
770 | else | |
771 | best_disk = best_dist_disk; | |
772 | } | |
773 | ||
76073054 | 774 | if (best_disk >= 0) { |
2d32777d | 775 | rdev = conf->mirrors[best_disk].rdev; |
8ddf9efe N |
776 | if (!rdev) |
777 | goto retry; | |
778 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 779 | sectors = best_good_sectors; |
12cee5a8 SL |
780 | |
781 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
782 | conf->mirrors[best_disk].seq_start = this_sector; | |
783 | ||
be4d3280 | 784 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 | 785 | } |
d2eb35ac | 786 | *max_sectors = sectors; |
1da177e4 | 787 | |
76073054 | 788 | return best_disk; |
1da177e4 LT |
789 | } |
790 | ||
21bd9a68 JW |
791 | static void wake_up_barrier(struct r1conf *conf) |
792 | { | |
793 | if (wq_has_sleeper(&conf->wait_barrier)) | |
794 | wake_up(&conf->wait_barrier); | |
795 | } | |
796 | ||
673ca68d N |
797 | static void flush_bio_list(struct r1conf *conf, struct bio *bio) |
798 | { | |
799 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
9efcc2c3 | 800 | raid1_prepare_flush_writes(conf->mddev->bitmap); |
21bd9a68 | 801 | wake_up_barrier(conf); |
673ca68d N |
802 | |
803 | while (bio) { /* submit pending writes */ | |
804 | struct bio *next = bio->bi_next; | |
8295efbe YK |
805 | |
806 | raid1_submit_write(bio); | |
673ca68d | 807 | bio = next; |
5fa4f8ba | 808 | cond_resched(); |
673ca68d N |
809 | } |
810 | } | |
811 | ||
e8096360 | 812 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
813 | { |
814 | /* Any writes that have been queued but are awaiting | |
815 | * bitmap updates get flushed here. | |
a35e63ef | 816 | */ |
a35e63ef N |
817 | spin_lock_irq(&conf->device_lock); |
818 | ||
819 | if (conf->pending_bio_list.head) { | |
18022a1b | 820 | struct blk_plug plug; |
a35e63ef | 821 | struct bio *bio; |
18022a1b | 822 | |
a35e63ef | 823 | bio = bio_list_get(&conf->pending_bio_list); |
a35e63ef | 824 | spin_unlock_irq(&conf->device_lock); |
474beb57 N |
825 | |
826 | /* | |
827 | * As this is called in a wait_event() loop (see freeze_array), | |
828 | * current->state might be TASK_UNINTERRUPTIBLE which will | |
829 | * cause a warning when we prepare to wait again. As it is | |
830 | * rare that this path is taken, it is perfectly safe to force | |
831 | * us to go around the wait_event() loop again, so the warning | |
832 | * is a false-positive. Silence the warning by resetting | |
833 | * thread state | |
834 | */ | |
835 | __set_current_state(TASK_RUNNING); | |
18022a1b | 836 | blk_start_plug(&plug); |
673ca68d | 837 | flush_bio_list(conf, bio); |
18022a1b | 838 | blk_finish_plug(&plug); |
a35e63ef N |
839 | } else |
840 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
841 | } |
842 | ||
17999be4 N |
843 | /* Barriers.... |
844 | * Sometimes we need to suspend IO while we do something else, | |
845 | * either some resync/recovery, or reconfigure the array. | |
846 | * To do this we raise a 'barrier'. | |
847 | * The 'barrier' is a counter that can be raised multiple times | |
848 | * to count how many activities are happening which preclude | |
849 | * normal IO. | |
850 | * We can only raise the barrier if there is no pending IO. | |
851 | * i.e. if nr_pending == 0. | |
852 | * We choose only to raise the barrier if no-one is waiting for the | |
853 | * barrier to go down. This means that as soon as an IO request | |
854 | * is ready, no other operations which require a barrier will start | |
855 | * until the IO request has had a chance. | |
856 | * | |
857 | * So: regular IO calls 'wait_barrier'. When that returns there | |
858 | * is no backgroup IO happening, It must arrange to call | |
859 | * allow_barrier when it has finished its IO. | |
860 | * backgroup IO calls must call raise_barrier. Once that returns | |
861 | * there is no normal IO happeing. It must arrange to call | |
862 | * lower_barrier when the particular background IO completes. | |
4675719d HT |
863 | * |
864 | * If resync/recovery is interrupted, returns -EINTR; | |
865 | * Otherwise, returns 0. | |
1da177e4 | 866 | */ |
4675719d | 867 | static int raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 | 868 | { |
fd76863e | 869 | int idx = sector_to_idx(sector_nr); |
870 | ||
1da177e4 | 871 | spin_lock_irq(&conf->resync_lock); |
17999be4 N |
872 | |
873 | /* Wait until no block IO is waiting */ | |
824e47da | 874 | wait_event_lock_irq(conf->wait_barrier, |
875 | !atomic_read(&conf->nr_waiting[idx]), | |
eed8c02e | 876 | conf->resync_lock); |
17999be4 N |
877 | |
878 | /* block any new IO from starting */ | |
824e47da | 879 | atomic_inc(&conf->barrier[idx]); |
880 | /* | |
881 | * In raise_barrier() we firstly increase conf->barrier[idx] then | |
882 | * check conf->nr_pending[idx]. In _wait_barrier() we firstly | |
883 | * increase conf->nr_pending[idx] then check conf->barrier[idx]. | |
884 | * A memory barrier here to make sure conf->nr_pending[idx] won't | |
885 | * be fetched before conf->barrier[idx] is increased. Otherwise | |
886 | * there will be a race between raise_barrier() and _wait_barrier(). | |
887 | */ | |
888 | smp_mb__after_atomic(); | |
17999be4 | 889 | |
79ef3a8a | 890 | /* For these conditions we must wait: |
891 | * A: while the array is in frozen state | |
fd76863e | 892 | * B: while conf->nr_pending[idx] is not 0, meaning regular I/O |
893 | * existing in corresponding I/O barrier bucket. | |
894 | * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches | |
895 | * max resync count which allowed on current I/O barrier bucket. | |
79ef3a8a | 896 | */ |
17999be4 | 897 | wait_event_lock_irq(conf->wait_barrier, |
8c242593 | 898 | (!conf->array_frozen && |
824e47da | 899 | !atomic_read(&conf->nr_pending[idx]) && |
8c242593 YY |
900 | atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || |
901 | test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), | |
eed8c02e | 902 | conf->resync_lock); |
17999be4 | 903 | |
8c242593 YY |
904 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { |
905 | atomic_dec(&conf->barrier[idx]); | |
906 | spin_unlock_irq(&conf->resync_lock); | |
907 | wake_up(&conf->wait_barrier); | |
908 | return -EINTR; | |
909 | } | |
910 | ||
43ac9b84 | 911 | atomic_inc(&conf->nr_sync_pending); |
17999be4 | 912 | spin_unlock_irq(&conf->resync_lock); |
8c242593 YY |
913 | |
914 | return 0; | |
17999be4 N |
915 | } |
916 | ||
fd76863e | 917 | static void lower_barrier(struct r1conf *conf, sector_t sector_nr) |
17999be4 | 918 | { |
fd76863e | 919 | int idx = sector_to_idx(sector_nr); |
920 | ||
824e47da | 921 | BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); |
fd76863e | 922 | |
824e47da | 923 | atomic_dec(&conf->barrier[idx]); |
43ac9b84 | 924 | atomic_dec(&conf->nr_sync_pending); |
17999be4 N |
925 | wake_up(&conf->wait_barrier); |
926 | } | |
927 | ||
5aa70503 | 928 | static bool _wait_barrier(struct r1conf *conf, int idx, bool nowait) |
17999be4 | 929 | { |
5aa70503 VV |
930 | bool ret = true; |
931 | ||
824e47da | 932 | /* |
933 | * We need to increase conf->nr_pending[idx] very early here, | |
934 | * then raise_barrier() can be blocked when it waits for | |
935 | * conf->nr_pending[idx] to be 0. Then we can avoid holding | |
936 | * conf->resync_lock when there is no barrier raised in same | |
937 | * barrier unit bucket. Also if the array is frozen, I/O | |
938 | * should be blocked until array is unfrozen. | |
939 | */ | |
940 | atomic_inc(&conf->nr_pending[idx]); | |
941 | /* | |
942 | * In _wait_barrier() we firstly increase conf->nr_pending[idx], then | |
943 | * check conf->barrier[idx]. In raise_barrier() we firstly increase | |
944 | * conf->barrier[idx], then check conf->nr_pending[idx]. A memory | |
945 | * barrier is necessary here to make sure conf->barrier[idx] won't be | |
946 | * fetched before conf->nr_pending[idx] is increased. Otherwise there | |
947 | * will be a race between _wait_barrier() and raise_barrier(). | |
948 | */ | |
949 | smp_mb__after_atomic(); | |
79ef3a8a | 950 | |
824e47da | 951 | /* |
952 | * Don't worry about checking two atomic_t variables at same time | |
953 | * here. If during we check conf->barrier[idx], the array is | |
954 | * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is | |
955 | * 0, it is safe to return and make the I/O continue. Because the | |
956 | * array is frozen, all I/O returned here will eventually complete | |
957 | * or be queued, no race will happen. See code comment in | |
958 | * frozen_array(). | |
959 | */ | |
960 | if (!READ_ONCE(conf->array_frozen) && | |
961 | !atomic_read(&conf->barrier[idx])) | |
5aa70503 | 962 | return ret; |
79ef3a8a | 963 | |
824e47da | 964 | /* |
965 | * After holding conf->resync_lock, conf->nr_pending[idx] | |
966 | * should be decreased before waiting for barrier to drop. | |
967 | * Otherwise, we may encounter a race condition because | |
968 | * raise_barrer() might be waiting for conf->nr_pending[idx] | |
969 | * to be 0 at same time. | |
970 | */ | |
971 | spin_lock_irq(&conf->resync_lock); | |
972 | atomic_inc(&conf->nr_waiting[idx]); | |
973 | atomic_dec(&conf->nr_pending[idx]); | |
974 | /* | |
975 | * In case freeze_array() is waiting for | |
976 | * get_unqueued_pending() == extra | |
977 | */ | |
21bd9a68 | 978 | wake_up_barrier(conf); |
824e47da | 979 | /* Wait for the barrier in same barrier unit bucket to drop. */ |
5aa70503 VV |
980 | |
981 | /* Return false when nowait flag is set */ | |
982 | if (nowait) { | |
983 | ret = false; | |
984 | } else { | |
985 | wait_event_lock_irq(conf->wait_barrier, | |
986 | !conf->array_frozen && | |
987 | !atomic_read(&conf->barrier[idx]), | |
988 | conf->resync_lock); | |
989 | atomic_inc(&conf->nr_pending[idx]); | |
990 | } | |
991 | ||
824e47da | 992 | atomic_dec(&conf->nr_waiting[idx]); |
fd76863e | 993 | spin_unlock_irq(&conf->resync_lock); |
5aa70503 | 994 | return ret; |
79ef3a8a | 995 | } |
996 | ||
5aa70503 | 997 | static bool wait_read_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) |
79ef3a8a | 998 | { |
fd76863e | 999 | int idx = sector_to_idx(sector_nr); |
5aa70503 | 1000 | bool ret = true; |
79ef3a8a | 1001 | |
824e47da | 1002 | /* |
1003 | * Very similar to _wait_barrier(). The difference is, for read | |
1004 | * I/O we don't need wait for sync I/O, but if the whole array | |
1005 | * is frozen, the read I/O still has to wait until the array is | |
1006 | * unfrozen. Since there is no ordering requirement with | |
1007 | * conf->barrier[idx] here, memory barrier is unnecessary as well. | |
1008 | */ | |
1009 | atomic_inc(&conf->nr_pending[idx]); | |
79ef3a8a | 1010 | |
824e47da | 1011 | if (!READ_ONCE(conf->array_frozen)) |
5aa70503 | 1012 | return ret; |
824e47da | 1013 | |
1014 | spin_lock_irq(&conf->resync_lock); | |
1015 | atomic_inc(&conf->nr_waiting[idx]); | |
1016 | atomic_dec(&conf->nr_pending[idx]); | |
1017 | /* | |
1018 | * In case freeze_array() is waiting for | |
1019 | * get_unqueued_pending() == extra | |
1020 | */ | |
21bd9a68 | 1021 | wake_up_barrier(conf); |
824e47da | 1022 | /* Wait for array to be unfrozen */ |
5aa70503 VV |
1023 | |
1024 | /* Return false when nowait flag is set */ | |
1025 | if (nowait) { | |
1026 | /* Return false when nowait flag is set */ | |
1027 | ret = false; | |
1028 | } else { | |
1029 | wait_event_lock_irq(conf->wait_barrier, | |
1030 | !conf->array_frozen, | |
1031 | conf->resync_lock); | |
1032 | atomic_inc(&conf->nr_pending[idx]); | |
1033 | } | |
1034 | ||
824e47da | 1035 | atomic_dec(&conf->nr_waiting[idx]); |
1da177e4 | 1036 | spin_unlock_irq(&conf->resync_lock); |
5aa70503 | 1037 | return ret; |
1da177e4 LT |
1038 | } |
1039 | ||
5aa70503 | 1040 | static bool wait_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) |
17999be4 | 1041 | { |
fd76863e | 1042 | int idx = sector_to_idx(sector_nr); |
79ef3a8a | 1043 | |
5aa70503 | 1044 | return _wait_barrier(conf, idx, nowait); |
fd76863e | 1045 | } |
1046 | ||
fd76863e | 1047 | static void _allow_barrier(struct r1conf *conf, int idx) |
17999be4 | 1048 | { |
824e47da | 1049 | atomic_dec(&conf->nr_pending[idx]); |
21bd9a68 | 1050 | wake_up_barrier(conf); |
17999be4 N |
1051 | } |
1052 | ||
fd76863e | 1053 | static void allow_barrier(struct r1conf *conf, sector_t sector_nr) |
1054 | { | |
1055 | int idx = sector_to_idx(sector_nr); | |
1056 | ||
1057 | _allow_barrier(conf, idx); | |
1058 | } | |
1059 | ||
fd76863e | 1060 | /* conf->resync_lock should be held */ |
1061 | static int get_unqueued_pending(struct r1conf *conf) | |
1062 | { | |
1063 | int idx, ret; | |
1064 | ||
43ac9b84 XN |
1065 | ret = atomic_read(&conf->nr_sync_pending); |
1066 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) | |
824e47da | 1067 | ret += atomic_read(&conf->nr_pending[idx]) - |
1068 | atomic_read(&conf->nr_queued[idx]); | |
fd76863e | 1069 | |
1070 | return ret; | |
1071 | } | |
1072 | ||
e2d59925 | 1073 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab | 1074 | { |
fd76863e | 1075 | /* Stop sync I/O and normal I/O and wait for everything to |
11353b9d | 1076 | * go quiet. |
fd76863e | 1077 | * This is called in two situations: |
1078 | * 1) management command handlers (reshape, remove disk, quiesce). | |
1079 | * 2) one normal I/O request failed. | |
1080 | ||
1081 | * After array_frozen is set to 1, new sync IO will be blocked at | |
1082 | * raise_barrier(), and new normal I/O will blocked at _wait_barrier() | |
1083 | * or wait_read_barrier(). The flying I/Os will either complete or be | |
1084 | * queued. When everything goes quite, there are only queued I/Os left. | |
1085 | ||
1086 | * Every flying I/O contributes to a conf->nr_pending[idx], idx is the | |
1087 | * barrier bucket index which this I/O request hits. When all sync and | |
1088 | * normal I/O are queued, sum of all conf->nr_pending[] will match sum | |
1089 | * of all conf->nr_queued[]. But normal I/O failure is an exception, | |
1090 | * in handle_read_error(), we may call freeze_array() before trying to | |
1091 | * fix the read error. In this case, the error read I/O is not queued, | |
1092 | * so get_unqueued_pending() == 1. | |
1093 | * | |
1094 | * Therefore before this function returns, we need to wait until | |
1095 | * get_unqueued_pendings(conf) gets equal to extra. For | |
1096 | * normal I/O context, extra is 1, in rested situations extra is 0. | |
ddaf22ab N |
1097 | */ |
1098 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1099 | conf->array_frozen = 1; |
578b54ad | 1100 | raid1_log(conf->mddev, "wait freeze"); |
fd76863e | 1101 | wait_event_lock_irq_cmd( |
1102 | conf->wait_barrier, | |
1103 | get_unqueued_pending(conf) == extra, | |
1104 | conf->resync_lock, | |
1105 | flush_pending_writes(conf)); | |
ddaf22ab N |
1106 | spin_unlock_irq(&conf->resync_lock); |
1107 | } | |
e8096360 | 1108 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
1109 | { |
1110 | /* reverse the effect of the freeze */ | |
1111 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 1112 | conf->array_frozen = 0; |
ddaf22ab | 1113 | spin_unlock_irq(&conf->resync_lock); |
824e47da | 1114 | wake_up(&conf->wait_barrier); |
ddaf22ab N |
1115 | } |
1116 | ||
16d56e2f | 1117 | static void alloc_behind_master_bio(struct r1bio *r1_bio, |
cb83efcf | 1118 | struct bio *bio) |
4b6d287f | 1119 | { |
cb83efcf | 1120 | int size = bio->bi_iter.bi_size; |
841c1316 ML |
1121 | unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1122 | int i = 0; | |
1123 | struct bio *behind_bio = NULL; | |
1124 | ||
609be106 CH |
1125 | behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO, |
1126 | &r1_bio->mddev->bio_set); | |
4b6d287f | 1127 | |
41743c1f | 1128 | /* discard op, we don't support writezero/writesame yet */ |
16d56e2f SL |
1129 | if (!bio_has_data(bio)) { |
1130 | behind_bio->bi_iter.bi_size = size; | |
41743c1f | 1131 | goto skip_copy; |
16d56e2f | 1132 | } |
41743c1f | 1133 | |
841c1316 ML |
1134 | while (i < vcnt && size) { |
1135 | struct page *page; | |
1136 | int len = min_t(int, PAGE_SIZE, size); | |
1137 | ||
1138 | page = alloc_page(GFP_NOIO); | |
1139 | if (unlikely(!page)) | |
1140 | goto free_pages; | |
1141 | ||
b42473cd JT |
1142 | if (!bio_add_page(behind_bio, page, len, 0)) { |
1143 | put_page(page); | |
1144 | goto free_pages; | |
1145 | } | |
841c1316 ML |
1146 | |
1147 | size -= len; | |
1148 | i++; | |
4b6d287f | 1149 | } |
841c1316 | 1150 | |
cb83efcf | 1151 | bio_copy_data(behind_bio, bio); |
41743c1f | 1152 | skip_copy: |
56a64c17 | 1153 | r1_bio->behind_master_bio = behind_bio; |
af6d7b76 | 1154 | set_bit(R1BIO_BehindIO, &r1_bio->state); |
4b6d287f | 1155 | |
16d56e2f | 1156 | return; |
841c1316 ML |
1157 | |
1158 | free_pages: | |
4f024f37 KO |
1159 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1160 | bio->bi_iter.bi_size); | |
841c1316 | 1161 | bio_free_pages(behind_bio); |
16d56e2f | 1162 | bio_put(behind_bio); |
4b6d287f N |
1163 | } |
1164 | ||
f54a9d0e N |
1165 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) |
1166 | { | |
1167 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1168 | cb); | |
1169 | struct mddev *mddev = plug->cb.data; | |
1170 | struct r1conf *conf = mddev->private; | |
1171 | struct bio *bio; | |
1172 | ||
9efcc2c3 | 1173 | if (from_schedule) { |
f54a9d0e N |
1174 | spin_lock_irq(&conf->device_lock); |
1175 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
f54a9d0e | 1176 | spin_unlock_irq(&conf->device_lock); |
21bd9a68 | 1177 | wake_up_barrier(conf); |
f54a9d0e N |
1178 | md_wakeup_thread(mddev->thread); |
1179 | kfree(plug); | |
1180 | return; | |
1181 | } | |
1182 | ||
1183 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1184 | bio = bio_list_get(&plug->pending); | |
673ca68d | 1185 | flush_bio_list(conf, bio); |
f54a9d0e N |
1186 | kfree(plug); |
1187 | } | |
1188 | ||
689389a0 N |
1189 | static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) |
1190 | { | |
1191 | r1_bio->master_bio = bio; | |
1192 | r1_bio->sectors = bio_sectors(bio); | |
1193 | r1_bio->state = 0; | |
1194 | r1_bio->mddev = mddev; | |
1195 | r1_bio->sector = bio->bi_iter.bi_sector; | |
1196 | } | |
1197 | ||
fd76863e | 1198 | static inline struct r1bio * |
689389a0 | 1199 | alloc_r1bio(struct mddev *mddev, struct bio *bio) |
fd76863e | 1200 | { |
1201 | struct r1conf *conf = mddev->private; | |
1202 | struct r1bio *r1_bio; | |
1203 | ||
afeee514 | 1204 | r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); |
689389a0 N |
1205 | /* Ensure no bio records IO_BLOCKED */ |
1206 | memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); | |
1207 | init_r1bio(r1_bio, mddev, bio); | |
fd76863e | 1208 | return r1_bio; |
1209 | } | |
1210 | ||
c230e7e5 | 1211 | static void raid1_read_request(struct mddev *mddev, struct bio *bio, |
689389a0 | 1212 | int max_read_sectors, struct r1bio *r1_bio) |
1da177e4 | 1213 | { |
e8096360 | 1214 | struct r1conf *conf = mddev->private; |
0eaf822c | 1215 | struct raid1_info *mirror; |
1da177e4 | 1216 | struct bio *read_bio; |
3b046a97 | 1217 | struct bitmap *bitmap = mddev->bitmap; |
3c5e514d BVA |
1218 | const enum req_op op = bio_op(bio); |
1219 | const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC; | |
3b046a97 RL |
1220 | int max_sectors; |
1221 | int rdisk; | |
9b8ae7b9 | 1222 | bool r1bio_existed = !!r1_bio; |
689389a0 | 1223 | char b[BDEVNAME_SIZE]; |
3b046a97 | 1224 | |
fd76863e | 1225 | /* |
689389a0 N |
1226 | * If r1_bio is set, we are blocking the raid1d thread |
1227 | * so there is a tiny risk of deadlock. So ask for | |
1228 | * emergency memory if needed. | |
fd76863e | 1229 | */ |
689389a0 | 1230 | gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; |
fd76863e | 1231 | |
9b8ae7b9 | 1232 | if (r1bio_existed) { |
689389a0 | 1233 | /* Need to get the block device name carefully */ |
2d32777d YK |
1234 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1235 | ||
689389a0 | 1236 | if (rdev) |
900d156b | 1237 | snprintf(b, sizeof(b), "%pg", rdev->bdev); |
689389a0 N |
1238 | else |
1239 | strcpy(b, "???"); | |
689389a0 | 1240 | } |
3b046a97 | 1241 | |
fd76863e | 1242 | /* |
fd76863e | 1243 | * Still need barrier for READ in case that whole |
1244 | * array is frozen. | |
fd76863e | 1245 | */ |
5aa70503 VV |
1246 | if (!wait_read_barrier(conf, bio->bi_iter.bi_sector, |
1247 | bio->bi_opf & REQ_NOWAIT)) { | |
1248 | bio_wouldblock_error(bio); | |
1249 | return; | |
1250 | } | |
fd76863e | 1251 | |
689389a0 N |
1252 | if (!r1_bio) |
1253 | r1_bio = alloc_r1bio(mddev, bio); | |
1254 | else | |
1255 | init_r1bio(r1_bio, mddev, bio); | |
c230e7e5 | 1256 | r1_bio->sectors = max_read_sectors; |
fd76863e | 1257 | |
1258 | /* | |
1259 | * make_request() can abort the operation when read-ahead is being | |
1260 | * used and no empty request is available. | |
1261 | */ | |
3b046a97 RL |
1262 | rdisk = read_balance(conf, r1_bio, &max_sectors); |
1263 | ||
1264 | if (rdisk < 0) { | |
1265 | /* couldn't find anywhere to read from */ | |
9b8ae7b9 | 1266 | if (r1bio_existed) { |
689389a0 N |
1267 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
1268 | mdname(mddev), | |
1269 | b, | |
1270 | (unsigned long long)r1_bio->sector); | |
1271 | } | |
3b046a97 RL |
1272 | raid_end_bio_io(r1_bio); |
1273 | return; | |
1274 | } | |
1275 | mirror = conf->mirrors + rdisk; | |
1276 | ||
9b8ae7b9 | 1277 | if (r1bio_existed) |
913cce5a | 1278 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %pg\n", |
689389a0 N |
1279 | mdname(mddev), |
1280 | (unsigned long long)r1_bio->sector, | |
913cce5a | 1281 | mirror->rdev->bdev); |
689389a0 | 1282 | |
3b046a97 RL |
1283 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1284 | bitmap) { | |
1285 | /* | |
1286 | * Reading from a write-mostly device must take care not to | |
1287 | * over-take any writes that are 'behind' | |
1288 | */ | |
1289 | raid1_log(mddev, "wait behind writes"); | |
1290 | wait_event(bitmap->behind_wait, | |
1291 | atomic_read(&bitmap->behind_writes) == 0); | |
1292 | } | |
c230e7e5 N |
1293 | |
1294 | if (max_sectors < bio_sectors(bio)) { | |
1295 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1296 | gfp, &conf->bio_split); |
c230e7e5 | 1297 | bio_chain(split, bio); |
ed00aabd | 1298 | submit_bio_noacct(bio); |
c230e7e5 N |
1299 | bio = split; |
1300 | r1_bio->master_bio = bio; | |
1301 | r1_bio->sectors = max_sectors; | |
1302 | } | |
1303 | ||
3b046a97 | 1304 | r1_bio->read_disk = rdisk; |
bb2a9ace YK |
1305 | if (!r1bio_existed) { |
1306 | md_account_bio(mddev, &bio); | |
1307 | r1_bio->master_bio = bio; | |
1308 | } | |
abfc426d CH |
1309 | read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp, |
1310 | &mddev->bio_set); | |
3b046a97 RL |
1311 | |
1312 | r1_bio->bios[rdisk] = read_bio; | |
1313 | ||
1314 | read_bio->bi_iter.bi_sector = r1_bio->sector + | |
1315 | mirror->rdev->data_offset; | |
3b046a97 | 1316 | read_bio->bi_end_io = raid1_end_read_request; |
c34b7ac6 | 1317 | read_bio->bi_opf = op | do_sync; |
3b046a97 RL |
1318 | if (test_bit(FailFast, &mirror->rdev->flags) && |
1319 | test_bit(R1BIO_FailFast, &r1_bio->state)) | |
1320 | read_bio->bi_opf |= MD_FAILFAST; | |
1321 | read_bio->bi_private = r1_bio; | |
1322 | ||
1323 | if (mddev->gendisk) | |
1c02fca6 CH |
1324 | trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), |
1325 | r1_bio->sector); | |
3b046a97 | 1326 | |
ed00aabd | 1327 | submit_bio_noacct(read_bio); |
3b046a97 RL |
1328 | } |
1329 | ||
c230e7e5 N |
1330 | static void raid1_write_request(struct mddev *mddev, struct bio *bio, |
1331 | int max_write_sectors) | |
3b046a97 RL |
1332 | { |
1333 | struct r1conf *conf = mddev->private; | |
fd76863e | 1334 | struct r1bio *r1_bio; |
1f68f0c4 | 1335 | int i, disks; |
3b046a97 | 1336 | struct bitmap *bitmap = mddev->bitmap; |
191ea9b2 | 1337 | unsigned long flags; |
3cb03002 | 1338 | struct md_rdev *blocked_rdev; |
1f68f0c4 | 1339 | int first_clone; |
1f68f0c4 | 1340 | int max_sectors; |
6607cd31 | 1341 | bool write_behind = false; |
9e55a22f | 1342 | bool is_discard = (bio_op(bio) == REQ_OP_DISCARD); |
191ea9b2 | 1343 | |
b3143b9a | 1344 | if (mddev_is_clustered(mddev) && |
90382ed9 | 1345 | md_cluster_ops->area_resyncing(mddev, WRITE, |
b3143b9a | 1346 | bio->bi_iter.bi_sector, bio_end_sector(bio))) { |
3b046a97 | 1347 | |
6eef4b21 | 1348 | DEFINE_WAIT(w); |
5aa70503 VV |
1349 | if (bio->bi_opf & REQ_NOWAIT) { |
1350 | bio_wouldblock_error(bio); | |
1351 | return; | |
1352 | } | |
6eef4b21 | 1353 | for (;;) { |
6eef4b21 | 1354 | prepare_to_wait(&conf->wait_barrier, |
ae89fd3d | 1355 | &w, TASK_IDLE); |
f81f7302 | 1356 | if (!md_cluster_ops->area_resyncing(mddev, WRITE, |
385f4d7f | 1357 | bio->bi_iter.bi_sector, |
b3143b9a | 1358 | bio_end_sector(bio))) |
6eef4b21 N |
1359 | break; |
1360 | schedule(); | |
1361 | } | |
1362 | finish_wait(&conf->wait_barrier, &w); | |
1363 | } | |
f81f7302 GJ |
1364 | |
1365 | /* | |
1366 | * Register the new request and wait if the reconstruction | |
1367 | * thread has put up a bar for new requests. | |
1368 | * Continue immediately if no resync is active currently. | |
1369 | */ | |
5aa70503 VV |
1370 | if (!wait_barrier(conf, bio->bi_iter.bi_sector, |
1371 | bio->bi_opf & REQ_NOWAIT)) { | |
1372 | bio_wouldblock_error(bio); | |
1373 | return; | |
1374 | } | |
fd76863e | 1375 | |
992db13a | 1376 | retry_write: |
689389a0 | 1377 | r1_bio = alloc_r1bio(mddev, bio); |
c230e7e5 | 1378 | r1_bio->sectors = max_write_sectors; |
1da177e4 | 1379 | |
1f68f0c4 | 1380 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1381 | * inc refcount on their rdev. Record them by setting |
1382 | * bios[x] to bio | |
1f68f0c4 N |
1383 | * If there are known/acknowledged bad blocks on any device on |
1384 | * which we have seen a write error, we want to avoid writing those | |
1385 | * blocks. | |
1386 | * This potentially requires several writes to write around | |
1387 | * the bad blocks. Each set of writes gets it's own r1bio | |
1388 | * with a set of bios attached. | |
1da177e4 | 1389 | */ |
c3b328ac | 1390 | |
8f19ccb2 | 1391 | disks = conf->raid_disks * 2; |
6bfe0b49 | 1392 | blocked_rdev = NULL; |
1f68f0c4 | 1393 | max_sectors = r1_bio->sectors; |
1da177e4 | 1394 | for (i = 0; i < disks; i++) { |
2d32777d | 1395 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
6607cd31 GJ |
1396 | |
1397 | /* | |
1398 | * The write-behind io is only attempted on drives marked as | |
1399 | * write-mostly, which means we could allocate write behind | |
1400 | * bio later. | |
1401 | */ | |
9e55a22f | 1402 | if (!is_discard && rdev && test_bit(WriteMostly, &rdev->flags)) |
6607cd31 GJ |
1403 | write_behind = true; |
1404 | ||
6bfe0b49 DW |
1405 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1406 | atomic_inc(&rdev->nr_pending); | |
1407 | blocked_rdev = rdev; | |
1408 | break; | |
1409 | } | |
1f68f0c4 | 1410 | r1_bio->bios[i] = NULL; |
8ae12666 | 1411 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1412 | if (i < conf->raid_disks) |
1413 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1414 | continue; |
1415 | } | |
1416 | ||
1417 | atomic_inc(&rdev->nr_pending); | |
1418 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1419 | sector_t first_bad; | |
1420 | int bad_sectors; | |
1421 | int is_bad; | |
1422 | ||
3b046a97 | 1423 | is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, |
1f68f0c4 N |
1424 | &first_bad, &bad_sectors); |
1425 | if (is_bad < 0) { | |
1426 | /* mustn't write here until the bad block is | |
1427 | * acknowledged*/ | |
1428 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1429 | blocked_rdev = rdev; | |
1430 | break; | |
1431 | } | |
1432 | if (is_bad && first_bad <= r1_bio->sector) { | |
1433 | /* Cannot write here at all */ | |
1434 | bad_sectors -= (r1_bio->sector - first_bad); | |
1435 | if (bad_sectors < max_sectors) | |
1436 | /* mustn't write more than bad_sectors | |
1437 | * to other devices yet | |
1438 | */ | |
1439 | max_sectors = bad_sectors; | |
03c902e1 | 1440 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1441 | /* We don't set R1BIO_Degraded as that |
1442 | * only applies if the disk is | |
1443 | * missing, so it might be re-added, | |
1444 | * and we want to know to recover this | |
1445 | * chunk. | |
1446 | * In this case the device is here, | |
1447 | * and the fact that this chunk is not | |
1448 | * in-sync is recorded in the bad | |
1449 | * block log | |
1450 | */ | |
1451 | continue; | |
964147d5 | 1452 | } |
1f68f0c4 N |
1453 | if (is_bad) { |
1454 | int good_sectors = first_bad - r1_bio->sector; | |
1455 | if (good_sectors < max_sectors) | |
1456 | max_sectors = good_sectors; | |
1457 | } | |
1458 | } | |
1459 | r1_bio->bios[i] = bio; | |
1da177e4 | 1460 | } |
1da177e4 | 1461 | |
6bfe0b49 DW |
1462 | if (unlikely(blocked_rdev)) { |
1463 | /* Wait for this device to become unblocked */ | |
1464 | int j; | |
1465 | ||
1466 | for (j = 0; j < i; j++) | |
1467 | if (r1_bio->bios[j]) | |
1468 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
992db13a | 1469 | free_r1bio(r1_bio); |
fd76863e | 1470 | allow_barrier(conf, bio->bi_iter.bi_sector); |
5aa70503 VV |
1471 | |
1472 | if (bio->bi_opf & REQ_NOWAIT) { | |
1473 | bio_wouldblock_error(bio); | |
1474 | return; | |
1475 | } | |
578b54ad | 1476 | raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 | 1477 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
5aa70503 | 1478 | wait_barrier(conf, bio->bi_iter.bi_sector, false); |
6bfe0b49 DW |
1479 | goto retry_write; |
1480 | } | |
1481 | ||
6607cd31 GJ |
1482 | /* |
1483 | * When using a bitmap, we may call alloc_behind_master_bio below. | |
1484 | * alloc_behind_master_bio allocates a copy of the data payload a page | |
1485 | * at a time and thus needs a new bio that can fit the whole payload | |
1486 | * this bio in page sized chunks. | |
1487 | */ | |
1488 | if (write_behind && bitmap) | |
1489 | max_sectors = min_t(int, max_sectors, | |
1490 | BIO_MAX_VECS * (PAGE_SIZE >> 9)); | |
c230e7e5 N |
1491 | if (max_sectors < bio_sectors(bio)) { |
1492 | struct bio *split = bio_split(bio, max_sectors, | |
afeee514 | 1493 | GFP_NOIO, &conf->bio_split); |
c230e7e5 | 1494 | bio_chain(split, bio); |
ed00aabd | 1495 | submit_bio_noacct(bio); |
c230e7e5 N |
1496 | bio = split; |
1497 | r1_bio->master_bio = bio; | |
1f68f0c4 | 1498 | r1_bio->sectors = max_sectors; |
191ea9b2 | 1499 | } |
4b6d287f | 1500 | |
bb2a9ace YK |
1501 | md_account_bio(mddev, &bio); |
1502 | r1_bio->master_bio = bio; | |
4e78064f | 1503 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1504 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1505 | |
1f68f0c4 | 1506 | first_clone = 1; |
d8c84c4f | 1507 | |
1da177e4 | 1508 | for (i = 0; i < disks; i++) { |
8e58e327 | 1509 | struct bio *mbio = NULL; |
69df9cfc | 1510 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
1da177e4 LT |
1511 | if (!r1_bio->bios[i]) |
1512 | continue; | |
1513 | ||
46669e86 | 1514 | if (first_clone) { |
1f68f0c4 N |
1515 | /* do behind I/O ? |
1516 | * Not if there are too many, or cannot | |
1517 | * allocate memory, or a reader on WriteMostly | |
1518 | * is waiting for behind writes to flush */ | |
6b2460e6 | 1519 | if (bitmap && write_behind && |
1f68f0c4 N |
1520 | (atomic_read(&bitmap->behind_writes) |
1521 | < mddev->bitmap_info.max_write_behind) && | |
8e58e327 | 1522 | !waitqueue_active(&bitmap->behind_wait)) { |
16d56e2f | 1523 | alloc_behind_master_bio(r1_bio, bio); |
8e58e327 | 1524 | } |
1f68f0c4 | 1525 | |
e64e4018 AS |
1526 | md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, |
1527 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1f68f0c4 N |
1528 | first_clone = 0; |
1529 | } | |
8e58e327 | 1530 | |
841c1316 | 1531 | if (r1_bio->behind_master_bio) { |
abfc426d CH |
1532 | mbio = bio_alloc_clone(rdev->bdev, |
1533 | r1_bio->behind_master_bio, | |
1534 | GFP_NOIO, &mddev->bio_set); | |
69df9cfc | 1535 | if (test_bit(CollisionCheck, &rdev->flags)) |
d0d2d8ba | 1536 | wait_for_serialization(rdev, r1_bio); |
3e148a32 | 1537 | if (test_bit(WriteMostly, &rdev->flags)) |
4b6d287f | 1538 | atomic_inc(&r1_bio->behind_remaining); |
abfc426d CH |
1539 | } else { |
1540 | mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, | |
1541 | &mddev->bio_set); | |
1542 | ||
1543 | if (mddev->serialize_policy) | |
1544 | wait_for_serialization(rdev, r1_bio); | |
1545 | } | |
4b6d287f | 1546 | |
1f68f0c4 N |
1547 | r1_bio->bios[i] = mbio; |
1548 | ||
2e94275e | 1549 | mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset); |
1f68f0c4 | 1550 | mbio->bi_end_io = raid1_end_write_request; |
a682e003 | 1551 | mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); |
2e94275e GJ |
1552 | if (test_bit(FailFast, &rdev->flags) && |
1553 | !test_bit(WriteMostly, &rdev->flags) && | |
212e7eb7 N |
1554 | conf->raid_disks - mddev->degraded > 1) |
1555 | mbio->bi_opf |= MD_FAILFAST; | |
1f68f0c4 N |
1556 | mbio->bi_private = r1_bio; |
1557 | ||
1da177e4 | 1558 | atomic_inc(&r1_bio->remaining); |
f54a9d0e | 1559 | |
109e3765 | 1560 | if (mddev->gendisk) |
1c02fca6 | 1561 | trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), |
109e3765 N |
1562 | r1_bio->sector); |
1563 | /* flush_pending_writes() needs access to the rdev so...*/ | |
2e94275e | 1564 | mbio->bi_bdev = (void *)rdev; |
460af1f9 | 1565 | if (!raid1_add_bio_to_plug(mddev, mbio, raid1_unplug, disks)) { |
23b245c0 | 1566 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e | 1567 | bio_list_add(&conf->pending_bio_list, mbio); |
23b245c0 | 1568 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a | 1569 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1570 | } |
1da177e4 | 1571 | } |
1f68f0c4 | 1572 | |
079fa166 N |
1573 | r1_bio_write_done(r1_bio); |
1574 | ||
1575 | /* In case raid1d snuck in to freeze_array */ | |
21bd9a68 | 1576 | wake_up_barrier(conf); |
1da177e4 LT |
1577 | } |
1578 | ||
cc27b0c7 | 1579 | static bool raid1_make_request(struct mddev *mddev, struct bio *bio) |
3b046a97 | 1580 | { |
fd76863e | 1581 | sector_t sectors; |
3b046a97 | 1582 | |
775d7831 DJ |
1583 | if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
1584 | && md_flush_request(mddev, bio)) | |
cc27b0c7 | 1585 | return true; |
3b046a97 | 1586 | |
c230e7e5 N |
1587 | /* |
1588 | * There is a limit to the maximum size, but | |
1589 | * the read/write handler might find a lower limit | |
1590 | * due to bad blocks. To avoid multiple splits, | |
1591 | * we pass the maximum number of sectors down | |
1592 | * and let the lower level perform the split. | |
1593 | */ | |
1594 | sectors = align_to_barrier_unit_end( | |
1595 | bio->bi_iter.bi_sector, bio_sectors(bio)); | |
61eb2b43 | 1596 | |
c230e7e5 | 1597 | if (bio_data_dir(bio) == READ) |
689389a0 | 1598 | raid1_read_request(mddev, bio, sectors, NULL); |
cc27b0c7 N |
1599 | else { |
1600 | if (!md_write_start(mddev,bio)) | |
1601 | return false; | |
c230e7e5 | 1602 | raid1_write_request(mddev, bio, sectors); |
cc27b0c7 N |
1603 | } |
1604 | return true; | |
3b046a97 RL |
1605 | } |
1606 | ||
849674e4 | 1607 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1608 | { |
e8096360 | 1609 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1610 | int i; |
1611 | ||
2d32777d YK |
1612 | lockdep_assert_held(&mddev->lock); |
1613 | ||
1da177e4 | 1614 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, |
11ce99e6 | 1615 | conf->raid_disks - mddev->degraded); |
ddac7c7e | 1616 | for (i = 0; i < conf->raid_disks; i++) { |
2d32777d YK |
1617 | struct md_rdev *rdev = READ_ONCE(conf->mirrors[i].rdev); |
1618 | ||
1da177e4 | 1619 | seq_printf(seq, "%s", |
ddac7c7e N |
1620 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1621 | } | |
1da177e4 LT |
1622 | seq_printf(seq, "]"); |
1623 | } | |
1624 | ||
9631abdb MT |
1625 | /** |
1626 | * raid1_error() - RAID1 error handler. | |
1627 | * @mddev: affected md device. | |
1628 | * @rdev: member device to fail. | |
1629 | * | |
1630 | * The routine acknowledges &rdev failure and determines new @mddev state. | |
1631 | * If it failed, then: | |
1632 | * - &MD_BROKEN flag is set in &mddev->flags. | |
1633 | * - recovery is disabled. | |
1634 | * Otherwise, it must be degraded: | |
1635 | * - recovery is interrupted. | |
1636 | * - &mddev->degraded is bumped. | |
1637 | * | |
1638 | * @rdev is marked as &Faulty excluding case when array is failed and | |
1639 | * &mddev->fail_last_dev is off. | |
1640 | */ | |
849674e4 | 1641 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1642 | { |
e8096360 | 1643 | struct r1conf *conf = mddev->private; |
423f04d6 | 1644 | unsigned long flags; |
1da177e4 | 1645 | |
2e52d449 | 1646 | spin_lock_irqsave(&conf->device_lock, flags); |
9631abdb MT |
1647 | |
1648 | if (test_bit(In_sync, &rdev->flags) && | |
1649 | (conf->raid_disks - mddev->degraded) == 1) { | |
1650 | set_bit(MD_BROKEN, &mddev->flags); | |
1651 | ||
1652 | if (!mddev->fail_last_dev) { | |
1653 | conf->recovery_disabled = mddev->recovery_disabled; | |
1654 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1655 | return; | |
1656 | } | |
4044ba58 | 1657 | } |
de393cde | 1658 | set_bit(Blocked, &rdev->flags); |
ebda52fa | 1659 | if (test_and_clear_bit(In_sync, &rdev->flags)) |
1da177e4 | 1660 | mddev->degraded++; |
ebda52fa | 1661 | set_bit(Faulty, &rdev->flags); |
423f04d6 | 1662 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1663 | /* |
1664 | * if recovery is running, make sure it aborts. | |
1665 | */ | |
1666 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2953079c SL |
1667 | set_mask_bits(&mddev->sb_flags, 0, |
1668 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
913cce5a | 1669 | pr_crit("md/raid1:%s: Disk failure on %pg, disabling device.\n" |
1d41c216 | 1670 | "md/raid1:%s: Operation continuing on %d devices.\n", |
913cce5a | 1671 | mdname(mddev), rdev->bdev, |
1d41c216 | 1672 | mdname(mddev), conf->raid_disks - mddev->degraded); |
1da177e4 LT |
1673 | } |
1674 | ||
e8096360 | 1675 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1676 | { |
1677 | int i; | |
1da177e4 | 1678 | |
1d41c216 | 1679 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1680 | if (!conf) { |
1d41c216 | 1681 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1682 | return; |
1683 | } | |
1d41c216 N |
1684 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1685 | conf->raid_disks); | |
1da177e4 | 1686 | |
2d32777d | 1687 | lockdep_assert_held(&conf->mddev->reconfig_mutex); |
1da177e4 | 1688 | for (i = 0; i < conf->raid_disks; i++) { |
2d32777d | 1689 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
ddac7c7e | 1690 | if (rdev) |
913cce5a | 1691 | pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n", |
1d41c216 N |
1692 | i, !test_bit(In_sync, &rdev->flags), |
1693 | !test_bit(Faulty, &rdev->flags), | |
913cce5a | 1694 | rdev->bdev); |
1da177e4 LT |
1695 | } |
1696 | } | |
1697 | ||
e8096360 | 1698 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1699 | { |
f6eca2d4 ND |
1700 | int idx; |
1701 | ||
1702 | for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { | |
5aa70503 | 1703 | _wait_barrier(conf, idx, false); |
f6eca2d4 ND |
1704 | _allow_barrier(conf, idx); |
1705 | } | |
1da177e4 | 1706 | |
afeee514 | 1707 | mempool_exit(&conf->r1buf_pool); |
1da177e4 LT |
1708 | } |
1709 | ||
fd01b88c | 1710 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1711 | { |
1712 | int i; | |
e8096360 | 1713 | struct r1conf *conf = mddev->private; |
6b965620 N |
1714 | int count = 0; |
1715 | unsigned long flags; | |
1da177e4 LT |
1716 | |
1717 | /* | |
f72ffdd6 | 1718 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1719 | * and mark them readable. |
1720 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1721 | * device_lock used to avoid races with raid1_end_read_request |
1722 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1723 | */ |
423f04d6 | 1724 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1725 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1726 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1727 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1728 | if (repl | |
1aee41f6 | 1729 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1730 | && repl->recovery_offset == MaxSector |
1731 | && !test_bit(Faulty, &repl->flags) | |
1732 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1733 | /* replacement has just become active */ | |
1734 | if (!rdev || | |
1735 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1736 | count++; | |
1737 | if (rdev) { | |
1738 | /* Replaced device not technically | |
1739 | * faulty, but we need to be sure | |
1740 | * it gets removed and never re-added | |
1741 | */ | |
1742 | set_bit(Faulty, &rdev->flags); | |
1743 | sysfs_notify_dirent_safe( | |
1744 | rdev->sysfs_state); | |
1745 | } | |
1746 | } | |
ddac7c7e | 1747 | if (rdev |
61e4947c | 1748 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1749 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1750 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1751 | count++; |
654e8b5a | 1752 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1753 | } |
1754 | } | |
6b965620 N |
1755 | mddev->degraded -= count; |
1756 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1757 | |
1758 | print_conf(conf); | |
6b965620 | 1759 | return count; |
1da177e4 LT |
1760 | } |
1761 | ||
fd01b88c | 1762 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1763 | { |
e8096360 | 1764 | struct r1conf *conf = mddev->private; |
199050ea | 1765 | int err = -EEXIST; |
ffb1e7a0 | 1766 | int mirror = 0, repl_slot = -1; |
0eaf822c | 1767 | struct raid1_info *p; |
6c2fce2e | 1768 | int first = 0; |
30194636 | 1769 | int last = conf->raid_disks - 1; |
1da177e4 | 1770 | |
5389042f N |
1771 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1772 | return -EBUSY; | |
1773 | ||
1501efad DW |
1774 | if (md_integrity_add_rdev(rdev, mddev)) |
1775 | return -ENXIO; | |
1776 | ||
6c2fce2e NB |
1777 | if (rdev->raid_disk >= 0) |
1778 | first = last = rdev->raid_disk; | |
1779 | ||
70bcecdb GR |
1780 | /* |
1781 | * find the disk ... but prefer rdev->saved_raid_disk | |
1782 | * if possible. | |
1783 | */ | |
1784 | if (rdev->saved_raid_disk >= 0 && | |
1785 | rdev->saved_raid_disk >= first && | |
9e753ba9 | 1786 | rdev->saved_raid_disk < conf->raid_disks && |
70bcecdb GR |
1787 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1788 | first = last = rdev->saved_raid_disk; | |
1789 | ||
7ef449d1 | 1790 | for (mirror = first; mirror <= last; mirror++) { |
ebfeb444 | 1791 | p = conf->mirrors + mirror; |
7ef449d1 | 1792 | if (!p->rdev) { |
9092c02d JB |
1793 | if (mddev->gendisk) |
1794 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1795 | rdev->data_offset << 9); | |
1da177e4 LT |
1796 | |
1797 | p->head_position = 0; | |
1798 | rdev->raid_disk = mirror; | |
199050ea | 1799 | err = 0; |
6aea114a N |
1800 | /* As all devices are equivalent, we don't need a full recovery |
1801 | * if this was recently any drive of the array | |
1802 | */ | |
1803 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1804 | conf->fullsync = 1; |
2d32777d | 1805 | WRITE_ONCE(p->rdev, rdev); |
1da177e4 LT |
1806 | break; |
1807 | } | |
7ef449d1 | 1808 | if (test_bit(WantReplacement, &p->rdev->flags) && |
ffb1e7a0 LN |
1809 | p[conf->raid_disks].rdev == NULL && repl_slot < 0) |
1810 | repl_slot = mirror; | |
7ef449d1 | 1811 | } |
ffb1e7a0 LN |
1812 | |
1813 | if (err && repl_slot >= 0) { | |
1814 | /* Add this device as a replacement */ | |
1815 | p = conf->mirrors + repl_slot; | |
1816 | clear_bit(In_sync, &rdev->flags); | |
1817 | set_bit(Replacement, &rdev->flags); | |
1818 | rdev->raid_disk = repl_slot; | |
1819 | err = 0; | |
1820 | conf->fullsync = 1; | |
2d32777d | 1821 | WRITE_ONCE(p[conf->raid_disks].rdev, rdev); |
ffb1e7a0 LN |
1822 | } |
1823 | ||
1da177e4 | 1824 | print_conf(conf); |
199050ea | 1825 | return err; |
1da177e4 LT |
1826 | } |
1827 | ||
b8321b68 | 1828 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1829 | { |
e8096360 | 1830 | struct r1conf *conf = mddev->private; |
1da177e4 | 1831 | int err = 0; |
b8321b68 | 1832 | int number = rdev->raid_disk; |
df203da4 | 1833 | struct raid1_info *p = conf->mirrors + number; |
8b0472b5 ZS |
1834 | |
1835 | if (unlikely(number >= conf->raid_disks)) | |
1836 | goto abort; | |
1837 | ||
b014f14c N |
1838 | if (rdev != p->rdev) |
1839 | p = conf->mirrors + conf->raid_disks + number; | |
1840 | ||
1da177e4 | 1841 | print_conf(conf); |
b8321b68 | 1842 | if (rdev == p->rdev) { |
b2d444d7 | 1843 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1844 | atomic_read(&rdev->nr_pending)) { |
1845 | err = -EBUSY; | |
1846 | goto abort; | |
1847 | } | |
046abeed | 1848 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1849 | * is not possible. |
1850 | */ | |
1851 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1852 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1853 | mddev->degraded < conf->raid_disks) { |
1854 | err = -EBUSY; | |
1855 | goto abort; | |
1856 | } | |
2d32777d | 1857 | WRITE_ONCE(p->rdev, NULL); |
d787be40 | 1858 | if (conf->mirrors[conf->raid_disks + number].rdev) { |
8c7a2c2b N |
1859 | /* We just removed a device that is being replaced. |
1860 | * Move down the replacement. We drain all IO before | |
1861 | * doing this to avoid confusion. | |
1862 | */ | |
1863 | struct md_rdev *repl = | |
1864 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1865 | freeze_array(conf, 0); |
3de59bb9 YY |
1866 | if (atomic_read(&repl->nr_pending)) { |
1867 | /* It means that some queued IO of retry_list | |
1868 | * hold repl. Thus, we cannot set replacement | |
1869 | * as NULL, avoiding rdev NULL pointer | |
1870 | * dereference in sync_request_write and | |
1871 | * handle_write_finished. | |
1872 | */ | |
1873 | err = -EBUSY; | |
1874 | unfreeze_array(conf); | |
1875 | goto abort; | |
1876 | } | |
8c7a2c2b | 1877 | clear_bit(Replacement, &repl->flags); |
2d32777d | 1878 | WRITE_ONCE(p->rdev, repl); |
8c7a2c2b | 1879 | conf->mirrors[conf->raid_disks + number].rdev = NULL; |
e2d59925 | 1880 | unfreeze_array(conf); |
e5bc9c3c GJ |
1881 | } |
1882 | ||
1883 | clear_bit(WantReplacement, &rdev->flags); | |
a91a2785 | 1884 | err = md_integrity_register(mddev); |
1da177e4 LT |
1885 | } |
1886 | abort: | |
1887 | ||
1888 | print_conf(conf); | |
1889 | return err; | |
1890 | } | |
1891 | ||
4246a0b6 | 1892 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1893 | { |
98d30c58 | 1894 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
1da177e4 | 1895 | |
0fc280f6 | 1896 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1897 | |
1da177e4 LT |
1898 | /* |
1899 | * we have read a block, now it needs to be re-written, | |
1900 | * or re-read if the read failed. | |
1901 | * We don't do much here, just schedule handling by raid1d | |
1902 | */ | |
4e4cbee9 | 1903 | if (!bio->bi_status) |
1da177e4 | 1904 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1905 | |
1906 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1907 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1908 | } |
1909 | ||
dfcc34c9 ND |
1910 | static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) |
1911 | { | |
1912 | sector_t sync_blocks = 0; | |
1913 | sector_t s = r1_bio->sector; | |
1914 | long sectors_to_go = r1_bio->sectors; | |
1915 | ||
1916 | /* make sure these bits don't get cleared. */ | |
1917 | do { | |
1918 | md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); | |
1919 | s += sync_blocks; | |
1920 | sectors_to_go -= sync_blocks; | |
1921 | } while (sectors_to_go > 0); | |
1922 | } | |
1923 | ||
449808a2 HT |
1924 | static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) |
1925 | { | |
1926 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
1927 | struct mddev *mddev = r1_bio->mddev; | |
1928 | int s = r1_bio->sectors; | |
1929 | ||
1930 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
1931 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1932 | reschedule_retry(r1_bio); | |
1933 | else { | |
1934 | put_buf(r1_bio); | |
1935 | md_done_sync(mddev, s, uptodate); | |
1936 | } | |
1937 | } | |
1938 | } | |
1939 | ||
4246a0b6 | 1940 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1941 | { |
4e4cbee9 | 1942 | int uptodate = !bio->bi_status; |
98d30c58 | 1943 | struct r1bio *r1_bio = get_resync_r1bio(bio); |
fd01b88c | 1944 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1945 | struct r1conf *conf = mddev->private; |
4367af55 N |
1946 | sector_t first_bad; |
1947 | int bad_sectors; | |
854abd75 | 1948 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1949 | |
6b1117d5 | 1950 | if (!uptodate) { |
dfcc34c9 | 1951 | abort_sync_write(mddev, r1_bio); |
854abd75 N |
1952 | set_bit(WriteErrorSeen, &rdev->flags); |
1953 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1954 | set_bit(MD_RECOVERY_NEEDED, & |
1955 | mddev->recovery); | |
d8f05d29 | 1956 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1957 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1958 | &first_bad, &bad_sectors) && |
1959 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1960 | r1_bio->sector, | |
1961 | r1_bio->sectors, | |
1962 | &first_bad, &bad_sectors) | |
1963 | ) | |
4367af55 | 1964 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1965 | |
449808a2 | 1966 | put_sync_write_buf(r1_bio, uptodate); |
1da177e4 LT |
1967 | } |
1968 | ||
3cb03002 | 1969 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
4ce4c73f | 1970 | int sectors, struct page *page, int rw) |
d8f05d29 | 1971 | { |
4ce4c73f | 1972 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) |
d8f05d29 N |
1973 | /* success */ |
1974 | return 1; | |
19d67169 | 1975 | if (rw == WRITE) { |
d8f05d29 | 1976 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1977 | if (!test_and_set_bit(WantReplacement, |
1978 | &rdev->flags)) | |
1979 | set_bit(MD_RECOVERY_NEEDED, & | |
1980 | rdev->mddev->recovery); | |
1981 | } | |
d8f05d29 N |
1982 | /* need to record an error - either for the block or the device */ |
1983 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1984 | md_error(rdev->mddev, rdev); | |
1985 | return 0; | |
1986 | } | |
1987 | ||
9f2c9d12 | 1988 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1989 | { |
a68e5870 N |
1990 | /* Try some synchronous reads of other devices to get |
1991 | * good data, much like with normal read errors. Only | |
1992 | * read into the pages we already have so we don't | |
1993 | * need to re-issue the read request. | |
1994 | * We don't need to freeze the array, because being in an | |
1995 | * active sync request, there is no normal IO, and | |
1996 | * no overlapping syncs. | |
06f60385 N |
1997 | * We don't need to check is_badblock() again as we |
1998 | * made sure that anything with a bad block in range | |
1999 | * will have bi_end_io clear. | |
a68e5870 | 2000 | */ |
fd01b88c | 2001 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2002 | struct r1conf *conf = mddev->private; |
a68e5870 | 2003 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
44cf0f4d | 2004 | struct page **pages = get_resync_pages(bio)->pages; |
a68e5870 N |
2005 | sector_t sect = r1_bio->sector; |
2006 | int sectors = r1_bio->sectors; | |
2007 | int idx = 0; | |
2e52d449 N |
2008 | struct md_rdev *rdev; |
2009 | ||
2010 | rdev = conf->mirrors[r1_bio->read_disk].rdev; | |
2011 | if (test_bit(FailFast, &rdev->flags)) { | |
2012 | /* Don't try recovering from here - just fail it | |
2013 | * ... unless it is the last working device of course */ | |
2014 | md_error(mddev, rdev); | |
2015 | if (test_bit(Faulty, &rdev->flags)) | |
2016 | /* Don't try to read from here, but make sure | |
2017 | * put_buf does it's thing | |
2018 | */ | |
2019 | bio->bi_end_io = end_sync_write; | |
2020 | } | |
a68e5870 N |
2021 | |
2022 | while(sectors) { | |
2023 | int s = sectors; | |
2024 | int d = r1_bio->read_disk; | |
2025 | int success = 0; | |
78d7f5f7 | 2026 | int start; |
a68e5870 N |
2027 | |
2028 | if (s > (PAGE_SIZE>>9)) | |
2029 | s = PAGE_SIZE >> 9; | |
2030 | do { | |
2031 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
2032 | /* No rcu protection needed here devices | |
2033 | * can only be removed when no resync is | |
2034 | * active, and resync is currently active | |
2035 | */ | |
2036 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 2037 | if (sync_page_io(rdev, sect, s<<9, |
44cf0f4d | 2038 | pages[idx], |
4ce4c73f | 2039 | REQ_OP_READ, false)) { |
a68e5870 N |
2040 | success = 1; |
2041 | break; | |
2042 | } | |
2043 | } | |
2044 | d++; | |
8f19ccb2 | 2045 | if (d == conf->raid_disks * 2) |
a68e5870 N |
2046 | d = 0; |
2047 | } while (!success && d != r1_bio->read_disk); | |
2048 | ||
78d7f5f7 | 2049 | if (!success) { |
3a9f28a5 N |
2050 | int abort = 0; |
2051 | /* Cannot read from anywhere, this block is lost. | |
2052 | * Record a bad block on each device. If that doesn't | |
2053 | * work just disable and interrupt the recovery. | |
2054 | * Don't fail devices as that won't really help. | |
2055 | */ | |
ac483eb3 CH |
2056 | pr_crit_ratelimited("md/raid1:%s: %pg: unrecoverable I/O read error for block %llu\n", |
2057 | mdname(mddev), bio->bi_bdev, | |
1d41c216 | 2058 | (unsigned long long)r1_bio->sector); |
8f19ccb2 | 2059 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
2060 | rdev = conf->mirrors[d].rdev; |
2061 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
2062 | continue; | |
2063 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
2064 | abort = 1; | |
2065 | } | |
2066 | if (abort) { | |
d890fa2b N |
2067 | conf->recovery_disabled = |
2068 | mddev->recovery_disabled; | |
3a9f28a5 N |
2069 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
2070 | md_done_sync(mddev, r1_bio->sectors, 0); | |
2071 | put_buf(r1_bio); | |
2072 | return 0; | |
2073 | } | |
2074 | /* Try next page */ | |
2075 | sectors -= s; | |
2076 | sect += s; | |
2077 | idx++; | |
2078 | continue; | |
d11c171e | 2079 | } |
78d7f5f7 N |
2080 | |
2081 | start = d; | |
2082 | /* write it back and re-read */ | |
2083 | while (d != r1_bio->read_disk) { | |
2084 | if (d == 0) | |
8f19ccb2 | 2085 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2086 | d--; |
2087 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2088 | continue; | |
2089 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2090 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2091 | pages[idx], |
d8f05d29 | 2092 | WRITE) == 0) { |
78d7f5f7 N |
2093 | r1_bio->bios[d]->bi_end_io = NULL; |
2094 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 2095 | } |
78d7f5f7 N |
2096 | } |
2097 | d = start; | |
2098 | while (d != r1_bio->read_disk) { | |
2099 | if (d == 0) | |
8f19ccb2 | 2100 | d = conf->raid_disks * 2; |
78d7f5f7 N |
2101 | d--; |
2102 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
2103 | continue; | |
2104 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 | 2105 | if (r1_sync_page_io(rdev, sect, s, |
44cf0f4d | 2106 | pages[idx], |
d8f05d29 | 2107 | READ) != 0) |
9d3d8011 | 2108 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 2109 | } |
a68e5870 N |
2110 | sectors -= s; |
2111 | sect += s; | |
2112 | idx ++; | |
2113 | } | |
78d7f5f7 | 2114 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4e4cbee9 | 2115 | bio->bi_status = 0; |
a68e5870 N |
2116 | return 1; |
2117 | } | |
2118 | ||
c95e6385 | 2119 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
2120 | { |
2121 | /* We have read all readable devices. If we haven't | |
2122 | * got the block, then there is no hope left. | |
2123 | * If we have, then we want to do a comparison | |
2124 | * and skip the write if everything is the same. | |
2125 | * If any blocks failed to read, then we need to | |
2126 | * attempt an over-write | |
2127 | */ | |
fd01b88c | 2128 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2129 | struct r1conf *conf = mddev->private; |
a68e5870 N |
2130 | int primary; |
2131 | int i; | |
f4380a91 | 2132 | int vcnt; |
a68e5870 | 2133 | |
30bc9b53 N |
2134 | /* Fix variable parts of all bios */ |
2135 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
2136 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
4e4cbee9 | 2137 | blk_status_t status; |
30bc9b53 | 2138 | struct bio *b = r1_bio->bios[i]; |
98d30c58 | 2139 | struct resync_pages *rp = get_resync_pages(b); |
30bc9b53 N |
2140 | if (b->bi_end_io != end_sync_read) |
2141 | continue; | |
4246a0b6 | 2142 | /* fixup the bio for reuse, but preserve errno */ |
4e4cbee9 | 2143 | status = b->bi_status; |
a7c50c94 | 2144 | bio_reset(b, conf->mirrors[i].rdev->bdev, REQ_OP_READ); |
4e4cbee9 | 2145 | b->bi_status = status; |
4f024f37 | 2146 | b->bi_iter.bi_sector = r1_bio->sector + |
30bc9b53 | 2147 | conf->mirrors[i].rdev->data_offset; |
30bc9b53 | 2148 | b->bi_end_io = end_sync_read; |
98d30c58 ML |
2149 | rp->raid_bio = r1_bio; |
2150 | b->bi_private = rp; | |
30bc9b53 | 2151 | |
fb0eb5df ML |
2152 | /* initialize bvec table again */ |
2153 | md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); | |
30bc9b53 | 2154 | } |
8f19ccb2 | 2155 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 2156 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4e4cbee9 | 2157 | !r1_bio->bios[primary]->bi_status) { |
a68e5870 N |
2158 | r1_bio->bios[primary]->bi_end_io = NULL; |
2159 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
2160 | break; | |
2161 | } | |
2162 | r1_bio->read_disk = primary; | |
8f19ccb2 | 2163 | for (i = 0; i < conf->raid_disks * 2; i++) { |
2b070cfe | 2164 | int j = 0; |
78d7f5f7 N |
2165 | struct bio *pbio = r1_bio->bios[primary]; |
2166 | struct bio *sbio = r1_bio->bios[i]; | |
4e4cbee9 | 2167 | blk_status_t status = sbio->bi_status; |
44cf0f4d ML |
2168 | struct page **ppages = get_resync_pages(pbio)->pages; |
2169 | struct page **spages = get_resync_pages(sbio)->pages; | |
60928a91 | 2170 | struct bio_vec *bi; |
8fc04e6e | 2171 | int page_len[RESYNC_PAGES] = { 0 }; |
6dc4f100 | 2172 | struct bvec_iter_all iter_all; |
a68e5870 | 2173 | |
2aabaa65 | 2174 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2175 | continue; |
4246a0b6 | 2176 | /* Now we can 'fixup' the error value */ |
4e4cbee9 | 2177 | sbio->bi_status = 0; |
78d7f5f7 | 2178 | |
2b070cfe CH |
2179 | bio_for_each_segment_all(bi, sbio, iter_all) |
2180 | page_len[j++] = bi->bv_len; | |
60928a91 | 2181 | |
4e4cbee9 | 2182 | if (!status) { |
78d7f5f7 | 2183 | for (j = vcnt; j-- ; ) { |
44cf0f4d ML |
2184 | if (memcmp(page_address(ppages[j]), |
2185 | page_address(spages[j]), | |
60928a91 | 2186 | page_len[j])) |
78d7f5f7 | 2187 | break; |
69382e85 | 2188 | } |
78d7f5f7 N |
2189 | } else |
2190 | j = 0; | |
2191 | if (j >= 0) | |
7f7583d4 | 2192 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2193 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4e4cbee9 | 2194 | && !status)) { |
78d7f5f7 N |
2195 | /* No need to write to this device. */ |
2196 | sbio->bi_end_io = NULL; | |
2197 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2198 | continue; | |
2199 | } | |
d3b45c2a KO |
2200 | |
2201 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2202 | } |
a68e5870 N |
2203 | } |
2204 | ||
9f2c9d12 | 2205 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2206 | { |
e8096360 | 2207 | struct r1conf *conf = mddev->private; |
a68e5870 | 2208 | int i; |
8f19ccb2 | 2209 | int disks = conf->raid_disks * 2; |
037d2ff6 | 2210 | struct bio *wbio; |
a68e5870 | 2211 | |
a68e5870 N |
2212 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2213 | /* ouch - failed to read all of that. */ | |
2214 | if (!fix_sync_read_error(r1_bio)) | |
2215 | return; | |
7ca78d57 N |
2216 | |
2217 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2218 | process_checks(r1_bio); |
2219 | ||
d11c171e N |
2220 | /* |
2221 | * schedule writes | |
2222 | */ | |
1da177e4 LT |
2223 | atomic_set(&r1_bio->remaining, 1); |
2224 | for (i = 0; i < disks ; i++) { | |
2225 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2226 | if (wbio->bi_end_io == NULL || |
2227 | (wbio->bi_end_io == end_sync_read && | |
2228 | (i == r1_bio->read_disk || | |
2229 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 | 2230 | continue; |
dfcc34c9 ND |
2231 | if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { |
2232 | abort_sync_write(mddev, r1_bio); | |
0c9d5b12 | 2233 | continue; |
dfcc34c9 | 2234 | } |
1da177e4 | 2235 | |
c34b7ac6 | 2236 | wbio->bi_opf = REQ_OP_WRITE; |
212e7eb7 N |
2237 | if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) |
2238 | wbio->bi_opf |= MD_FAILFAST; | |
2239 | ||
3e198f78 | 2240 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2241 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2242 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2243 | |
ed00aabd | 2244 | submit_bio_noacct(wbio); |
1da177e4 LT |
2245 | } |
2246 | ||
449808a2 | 2247 | put_sync_write_buf(r1_bio, 1); |
1da177e4 LT |
2248 | } |
2249 | ||
2250 | /* | |
2251 | * This is a kernel thread which: | |
2252 | * | |
2253 | * 1. Retries failed read operations on working mirrors. | |
2254 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2255 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2256 | */ |
2257 | ||
e8096360 | 2258 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2259 | sector_t sect, int sectors) |
2260 | { | |
fd01b88c | 2261 | struct mddev *mddev = conf->mddev; |
867868fb N |
2262 | while(sectors) { |
2263 | int s = sectors; | |
2264 | int d = read_disk; | |
2265 | int success = 0; | |
2266 | int start; | |
3cb03002 | 2267 | struct md_rdev *rdev; |
867868fb N |
2268 | |
2269 | if (s > (PAGE_SIZE>>9)) | |
2270 | s = PAGE_SIZE >> 9; | |
2271 | ||
2272 | do { | |
d2eb35ac N |
2273 | sector_t first_bad; |
2274 | int bad_sectors; | |
2275 | ||
2d32777d | 2276 | rdev = conf->mirrors[d].rdev; |
867868fb | 2277 | if (rdev && |
da8840a7 | 2278 | (test_bit(In_sync, &rdev->flags) || |
2279 | (!test_bit(Faulty, &rdev->flags) && | |
2280 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2281 | is_badblock(rdev, sect, s, |
707a6a42 N |
2282 | &first_bad, &bad_sectors) == 0) { |
2283 | atomic_inc(&rdev->nr_pending); | |
707a6a42 | 2284 | if (sync_page_io(rdev, sect, s<<9, |
4ce4c73f | 2285 | conf->tmppage, REQ_OP_READ, false)) |
707a6a42 N |
2286 | success = 1; |
2287 | rdev_dec_pending(rdev, mddev); | |
2288 | if (success) | |
2289 | break; | |
2d32777d YK |
2290 | } |
2291 | ||
707a6a42 N |
2292 | d++; |
2293 | if (d == conf->raid_disks * 2) | |
2294 | d = 0; | |
02c67a3b | 2295 | } while (d != read_disk); |
867868fb N |
2296 | |
2297 | if (!success) { | |
d8f05d29 | 2298 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2299 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2300 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2301 | md_error(mddev, rdev); | |
867868fb N |
2302 | break; |
2303 | } | |
2304 | /* write it back and re-read */ | |
2305 | start = d; | |
2306 | while (d != read_disk) { | |
2307 | if (d==0) | |
8f19ccb2 | 2308 | d = conf->raid_disks * 2; |
867868fb | 2309 | d--; |
2d32777d | 2310 | rdev = conf->mirrors[d].rdev; |
867868fb | 2311 | if (rdev && |
707a6a42 N |
2312 | !test_bit(Faulty, &rdev->flags)) { |
2313 | atomic_inc(&rdev->nr_pending); | |
d8f05d29 N |
2314 | r1_sync_page_io(rdev, sect, s, |
2315 | conf->tmppage, WRITE); | |
707a6a42 | 2316 | rdev_dec_pending(rdev, mddev); |
2d32777d | 2317 | } |
867868fb N |
2318 | } |
2319 | d = start; | |
2320 | while (d != read_disk) { | |
867868fb | 2321 | if (d==0) |
8f19ccb2 | 2322 | d = conf->raid_disks * 2; |
867868fb | 2323 | d--; |
2d32777d | 2324 | rdev = conf->mirrors[d].rdev; |
867868fb | 2325 | if (rdev && |
b8cb6b4c | 2326 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 | 2327 | atomic_inc(&rdev->nr_pending); |
d8f05d29 N |
2328 | if (r1_sync_page_io(rdev, sect, s, |
2329 | conf->tmppage, READ)) { | |
867868fb | 2330 | atomic_add(s, &rdev->corrected_errors); |
913cce5a | 2331 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %pg)\n", |
1d41c216 N |
2332 | mdname(mddev), s, |
2333 | (unsigned long long)(sect + | |
2334 | rdev->data_offset), | |
913cce5a | 2335 | rdev->bdev); |
867868fb | 2336 | } |
707a6a42 | 2337 | rdev_dec_pending(rdev, mddev); |
2d32777d | 2338 | } |
867868fb N |
2339 | } |
2340 | sectors -= s; | |
2341 | sect += s; | |
2342 | } | |
2343 | } | |
2344 | ||
9f2c9d12 | 2345 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2346 | { |
fd01b88c | 2347 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2348 | struct r1conf *conf = mddev->private; |
3cb03002 | 2349 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2350 | |
2351 | /* bio has the data to be written to device 'i' where | |
2352 | * we just recently had a write error. | |
2353 | * We repeatedly clone the bio and trim down to one block, | |
2354 | * then try the write. Where the write fails we record | |
2355 | * a bad block. | |
2356 | * It is conceivable that the bio doesn't exactly align with | |
2357 | * blocks. We must handle this somehow. | |
2358 | * | |
2359 | * We currently own a reference on the rdev. | |
2360 | */ | |
2361 | ||
2362 | int block_sectors; | |
2363 | sector_t sector; | |
2364 | int sectors; | |
2365 | int sect_to_write = r1_bio->sectors; | |
2366 | int ok = 1; | |
2367 | ||
2368 | if (rdev->badblocks.shift < 0) | |
2369 | return 0; | |
2370 | ||
ab713cdc ND |
2371 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2372 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2373 | sector = r1_bio->sector; |
2374 | sectors = ((sector + block_sectors) | |
2375 | & ~(sector_t)(block_sectors - 1)) | |
2376 | - sector; | |
2377 | ||
cd5ff9a1 N |
2378 | while (sect_to_write) { |
2379 | struct bio *wbio; | |
2380 | if (sectors > sect_to_write) | |
2381 | sectors = sect_to_write; | |
2382 | /* Write at 'sector' for 'sectors'*/ | |
2383 | ||
b783863f | 2384 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
abfc426d CH |
2385 | wbio = bio_alloc_clone(rdev->bdev, |
2386 | r1_bio->behind_master_bio, | |
2387 | GFP_NOIO, &mddev->bio_set); | |
b783863f | 2388 | } else { |
abfc426d CH |
2389 | wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio, |
2390 | GFP_NOIO, &mddev->bio_set); | |
b783863f KO |
2391 | } |
2392 | ||
c34b7ac6 | 2393 | wbio->bi_opf = REQ_OP_WRITE; |
4f024f37 KO |
2394 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2395 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2396 | |
6678d83f | 2397 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2398 | wbio->bi_iter.bi_sector += rdev->data_offset; |
4e49ea4a MC |
2399 | |
2400 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2401 | /* failure! */ |
2402 | ok = rdev_set_badblocks(rdev, sector, | |
2403 | sectors, 0) | |
2404 | && ok; | |
2405 | ||
2406 | bio_put(wbio); | |
2407 | sect_to_write -= sectors; | |
2408 | sector += sectors; | |
2409 | sectors = block_sectors; | |
2410 | } | |
2411 | return ok; | |
2412 | } | |
2413 | ||
e8096360 | 2414 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2415 | { |
2416 | int m; | |
2417 | int s = r1_bio->sectors; | |
8f19ccb2 | 2418 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2419 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2420 | struct bio *bio = r1_bio->bios[m]; |
2421 | if (bio->bi_end_io == NULL) | |
2422 | continue; | |
4e4cbee9 | 2423 | if (!bio->bi_status && |
62096bce | 2424 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2425 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2426 | } |
4e4cbee9 | 2427 | if (bio->bi_status && |
62096bce N |
2428 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2429 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2430 | md_error(conf->mddev, rdev); | |
2431 | } | |
2432 | } | |
2433 | put_buf(r1_bio); | |
2434 | md_done_sync(conf->mddev, s, 1); | |
2435 | } | |
2436 | ||
e8096360 | 2437 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2438 | { |
fd76863e | 2439 | int m, idx; |
55ce74d4 | 2440 | bool fail = false; |
fd76863e | 2441 | |
8f19ccb2 | 2442 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2443 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2444 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2445 | rdev_clear_badblocks(rdev, |
2446 | r1_bio->sector, | |
c6563a8c | 2447 | r1_bio->sectors, 0); |
62096bce N |
2448 | rdev_dec_pending(rdev, conf->mddev); |
2449 | } else if (r1_bio->bios[m] != NULL) { | |
2450 | /* This drive got a write error. We need to | |
2451 | * narrow down and record precise write | |
2452 | * errors. | |
2453 | */ | |
55ce74d4 | 2454 | fail = true; |
62096bce N |
2455 | if (!narrow_write_error(r1_bio, m)) { |
2456 | md_error(conf->mddev, | |
2457 | conf->mirrors[m].rdev); | |
2458 | /* an I/O failed, we can't clear the bitmap */ | |
2459 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2460 | } | |
2461 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2462 | conf->mddev); | |
2463 | } | |
55ce74d4 N |
2464 | if (fail) { |
2465 | spin_lock_irq(&conf->device_lock); | |
2466 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
fd76863e | 2467 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2468 | atomic_inc(&conf->nr_queued[idx]); |
55ce74d4 | 2469 | spin_unlock_irq(&conf->device_lock); |
824e47da | 2470 | /* |
2471 | * In case freeze_array() is waiting for condition | |
2472 | * get_unqueued_pending() == extra to be true. | |
2473 | */ | |
2474 | wake_up(&conf->wait_barrier); | |
55ce74d4 | 2475 | md_wakeup_thread(conf->mddev->thread); |
bd8688a1 N |
2476 | } else { |
2477 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2478 | close_write(r1_bio); | |
55ce74d4 | 2479 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2480 | } |
62096bce N |
2481 | } |
2482 | ||
e8096360 | 2483 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce | 2484 | { |
fd01b88c | 2485 | struct mddev *mddev = conf->mddev; |
62096bce | 2486 | struct bio *bio; |
3cb03002 | 2487 | struct md_rdev *rdev; |
c069da44 | 2488 | sector_t sector; |
62096bce N |
2489 | |
2490 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2491 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2492 | * the block and we can fix it. | |
2493 | * We freeze all other IO, and try reading the block from | |
2494 | * other devices. When we find one, we re-write | |
2495 | * and check it that fixes the read error. | |
2496 | * This is all done synchronously while the array is | |
2497 | * frozen | |
2498 | */ | |
7449f699 TM |
2499 | |
2500 | bio = r1_bio->bios[r1_bio->read_disk]; | |
7449f699 TM |
2501 | bio_put(bio); |
2502 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2503 | ||
2e52d449 N |
2504 | rdev = conf->mirrors[r1_bio->read_disk].rdev; |
2505 | if (mddev->ro == 0 | |
2506 | && !test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2507 | freeze_array(conf, 1); |
62096bce N |
2508 | fix_read_error(conf, r1_bio->read_disk, |
2509 | r1_bio->sector, r1_bio->sectors); | |
2510 | unfreeze_array(conf); | |
b33d1062 GK |
2511 | } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { |
2512 | md_error(mddev, rdev); | |
7449f699 TM |
2513 | } else { |
2514 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2515 | } | |
2516 | ||
2e52d449 | 2517 | rdev_dec_pending(rdev, conf->mddev); |
c069da44 | 2518 | sector = r1_bio->sector; |
689389a0 | 2519 | bio = r1_bio->master_bio; |
62096bce | 2520 | |
689389a0 N |
2521 | /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ |
2522 | r1_bio->state = 0; | |
2523 | raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); | |
c069da44 | 2524 | allow_barrier(conf, sector); |
62096bce N |
2525 | } |
2526 | ||
4ed8731d | 2527 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2528 | { |
4ed8731d | 2529 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2530 | struct r1bio *r1_bio; |
1da177e4 | 2531 | unsigned long flags; |
e8096360 | 2532 | struct r1conf *conf = mddev->private; |
1da177e4 | 2533 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2534 | struct blk_plug plug; |
fd76863e | 2535 | int idx; |
1da177e4 LT |
2536 | |
2537 | md_check_recovery(mddev); | |
e1dfa0a2 | 2538 | |
55ce74d4 | 2539 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2540 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
55ce74d4 N |
2541 | LIST_HEAD(tmp); |
2542 | spin_lock_irqsave(&conf->device_lock, flags); | |
fd76863e | 2543 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) |
2544 | list_splice_init(&conf->bio_end_io_list, &tmp); | |
55ce74d4 N |
2545 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2546 | while (!list_empty(&tmp)) { | |
a452744b MP |
2547 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2548 | retry_list); | |
55ce74d4 | 2549 | list_del(&r1_bio->retry_list); |
fd76863e | 2550 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2551 | atomic_dec(&conf->nr_queued[idx]); |
bd8688a1 N |
2552 | if (mddev->degraded) |
2553 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2554 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2555 | close_write(r1_bio); | |
55ce74d4 N |
2556 | raid_end_bio_io(r1_bio); |
2557 | } | |
2558 | } | |
2559 | ||
e1dfa0a2 | 2560 | blk_start_plug(&plug); |
1da177e4 | 2561 | for (;;) { |
191ea9b2 | 2562 | |
0021b7bc | 2563 | flush_pending_writes(conf); |
191ea9b2 | 2564 | |
a35e63ef N |
2565 | spin_lock_irqsave(&conf->device_lock, flags); |
2566 | if (list_empty(head)) { | |
2567 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2568 | break; |
a35e63ef | 2569 | } |
9f2c9d12 | 2570 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2571 | list_del(head->prev); |
fd76863e | 2572 | idx = sector_to_idx(r1_bio->sector); |
824e47da | 2573 | atomic_dec(&conf->nr_queued[idx]); |
1da177e4 LT |
2574 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2575 | ||
2576 | mddev = r1_bio->mddev; | |
070ec55d | 2577 | conf = mddev->private; |
4367af55 | 2578 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2579 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2580 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2581 | handle_sync_write_finished(conf, r1_bio); | |
2582 | else | |
4367af55 | 2583 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2584 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2585 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2586 | handle_write_finished(conf, r1_bio); | |
2587 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2588 | handle_read_error(conf, r1_bio); | |
2589 | else | |
c230e7e5 | 2590 | WARN_ON_ONCE(1); |
62096bce | 2591 | |
1d9d5241 | 2592 | cond_resched(); |
2953079c | 2593 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2594 | md_check_recovery(mddev); |
1da177e4 | 2595 | } |
e1dfa0a2 | 2596 | blk_finish_plug(&plug); |
1da177e4 LT |
2597 | } |
2598 | ||
e8096360 | 2599 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2600 | { |
2601 | int buffs; | |
2602 | ||
2603 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
afeee514 KO |
2604 | BUG_ON(mempool_initialized(&conf->r1buf_pool)); |
2605 | ||
2606 | return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, | |
2607 | r1buf_pool_free, conf->poolinfo); | |
1da177e4 LT |
2608 | } |
2609 | ||
208410b5 SL |
2610 | static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) |
2611 | { | |
afeee514 | 2612 | struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); |
208410b5 SL |
2613 | struct resync_pages *rps; |
2614 | struct bio *bio; | |
2615 | int i; | |
2616 | ||
2617 | for (i = conf->poolinfo->raid_disks; i--; ) { | |
2618 | bio = r1bio->bios[i]; | |
2619 | rps = bio->bi_private; | |
a7c50c94 | 2620 | bio_reset(bio, NULL, 0); |
208410b5 SL |
2621 | bio->bi_private = rps; |
2622 | } | |
2623 | r1bio->master_bio = NULL; | |
2624 | return r1bio; | |
2625 | } | |
2626 | ||
1da177e4 LT |
2627 | /* |
2628 | * perform a "sync" on one "block" | |
2629 | * | |
2630 | * We need to make sure that no normal I/O request - particularly write | |
2631 | * requests - conflict with active sync requests. | |
2632 | * | |
2633 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2634 | * that can be installed to exclude normal IO requests. | |
2635 | */ | |
2636 | ||
849674e4 SL |
2637 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2638 | int *skipped) | |
1da177e4 | 2639 | { |
e8096360 | 2640 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2641 | struct r1bio *r1_bio; |
1da177e4 LT |
2642 | struct bio *bio; |
2643 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2644 | int disk = -1; |
1da177e4 | 2645 | int i; |
3e198f78 N |
2646 | int wonly = -1; |
2647 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2648 | sector_t sync_blocks; |
e3b9703e | 2649 | int still_degraded = 0; |
06f60385 N |
2650 | int good_sectors = RESYNC_SECTORS; |
2651 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
fd76863e | 2652 | int idx = sector_to_idx(sector_nr); |
022e510f | 2653 | int page_idx = 0; |
1da177e4 | 2654 | |
afeee514 | 2655 | if (!mempool_initialized(&conf->r1buf_pool)) |
1da177e4 | 2656 | if (init_resync(conf)) |
57afd89f | 2657 | return 0; |
1da177e4 | 2658 | |
58c0fed4 | 2659 | max_sector = mddev->dev_sectors; |
1da177e4 | 2660 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2661 | /* If we aborted, we need to abort the |
2662 | * sync on the 'current' bitmap chunk (there will | |
2663 | * only be one in raid1 resync. | |
2664 | * We can find the current addess in mddev->curr_resync | |
2665 | */ | |
6a806c51 | 2666 | if (mddev->curr_resync < max_sector) /* aborted */ |
e64e4018 AS |
2667 | md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, |
2668 | &sync_blocks, 1); | |
6a806c51 | 2669 | else /* completed sync */ |
191ea9b2 | 2670 | conf->fullsync = 0; |
6a806c51 | 2671 | |
e64e4018 | 2672 | md_bitmap_close_sync(mddev->bitmap); |
1da177e4 | 2673 | close_sync(conf); |
c40f341f GR |
2674 | |
2675 | if (mddev_is_clustered(mddev)) { | |
2676 | conf->cluster_sync_low = 0; | |
2677 | conf->cluster_sync_high = 0; | |
c40f341f | 2678 | } |
1da177e4 LT |
2679 | return 0; |
2680 | } | |
2681 | ||
07d84d10 N |
2682 | if (mddev->bitmap == NULL && |
2683 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2684 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2685 | conf->fullsync == 0) { |
2686 | *skipped = 1; | |
2687 | return max_sector - sector_nr; | |
2688 | } | |
6394cca5 N |
2689 | /* before building a request, check if we can skip these blocks.. |
2690 | * This call the bitmap_start_sync doesn't actually record anything | |
2691 | */ | |
e64e4018 | 2692 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2693 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2694 | /* We can skip this block, and probably several more */ |
2695 | *skipped = 1; | |
2696 | return sync_blocks; | |
2697 | } | |
17999be4 | 2698 | |
7ac50447 TM |
2699 | /* |
2700 | * If there is non-resync activity waiting for a turn, then let it | |
2701 | * though before starting on this new sync request. | |
2702 | */ | |
824e47da | 2703 | if (atomic_read(&conf->nr_waiting[idx])) |
7ac50447 TM |
2704 | schedule_timeout_uninterruptible(1); |
2705 | ||
c40f341f GR |
2706 | /* we are incrementing sector_nr below. To be safe, we check against |
2707 | * sector_nr + two times RESYNC_SECTORS | |
2708 | */ | |
2709 | ||
e64e4018 | 2710 | md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, |
c40f341f | 2711 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); |
17999be4 | 2712 | |
8c242593 YY |
2713 | |
2714 | if (raise_barrier(conf, sector_nr)) | |
2715 | return 0; | |
2716 | ||
2717 | r1_bio = raid1_alloc_init_r1buf(conf); | |
1da177e4 LT |
2718 | |
2719 | /* | |
3e198f78 N |
2720 | * If we get a correctably read error during resync or recovery, |
2721 | * we might want to read from a different device. So we | |
2722 | * flag all drives that could conceivably be read from for READ, | |
2723 | * and any others (which will be non-In_sync devices) for WRITE. | |
2724 | * If a read fails, we try reading from something else for which READ | |
2725 | * is OK. | |
1da177e4 | 2726 | */ |
1da177e4 | 2727 | |
1da177e4 LT |
2728 | r1_bio->mddev = mddev; |
2729 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2730 | r1_bio->state = 0; |
1da177e4 | 2731 | set_bit(R1BIO_IsSync, &r1_bio->state); |
fd76863e | 2732 | /* make sure good_sectors won't go across barrier unit boundary */ |
2733 | good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); | |
1da177e4 | 2734 | |
8f19ccb2 | 2735 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2736 | struct md_rdev *rdev; |
1da177e4 | 2737 | bio = r1_bio->bios[i]; |
1da177e4 | 2738 | |
2d32777d | 2739 | rdev = conf->mirrors[i].rdev; |
3e198f78 | 2740 | if (rdev == NULL || |
06f60385 | 2741 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2742 | if (i < conf->raid_disks) |
2743 | still_degraded = 1; | |
3e198f78 | 2744 | } else if (!test_bit(In_sync, &rdev->flags)) { |
c34b7ac6 | 2745 | bio->bi_opf = REQ_OP_WRITE; |
1da177e4 LT |
2746 | bio->bi_end_io = end_sync_write; |
2747 | write_targets ++; | |
3e198f78 N |
2748 | } else { |
2749 | /* may need to read from here */ | |
06f60385 N |
2750 | sector_t first_bad = MaxSector; |
2751 | int bad_sectors; | |
2752 | ||
2753 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2754 | &first_bad, &bad_sectors)) { | |
2755 | if (first_bad > sector_nr) | |
2756 | good_sectors = first_bad - sector_nr; | |
2757 | else { | |
2758 | bad_sectors -= (sector_nr - first_bad); | |
2759 | if (min_bad == 0 || | |
2760 | min_bad > bad_sectors) | |
2761 | min_bad = bad_sectors; | |
2762 | } | |
2763 | } | |
2764 | if (sector_nr < first_bad) { | |
2765 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2766 | if (wonly < 0) | |
2767 | wonly = i; | |
2768 | } else { | |
2769 | if (disk < 0) | |
2770 | disk = i; | |
2771 | } | |
c34b7ac6 | 2772 | bio->bi_opf = REQ_OP_READ; |
06f60385 N |
2773 | bio->bi_end_io = end_sync_read; |
2774 | read_targets++; | |
d57368af AL |
2775 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2776 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2777 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2778 | /* | |
2779 | * The device is suitable for reading (InSync), | |
2780 | * but has bad block(s) here. Let's try to correct them, | |
2781 | * if we are doing resync or repair. Otherwise, leave | |
2782 | * this device alone for this sync request. | |
2783 | */ | |
c34b7ac6 | 2784 | bio->bi_opf = REQ_OP_WRITE; |
d57368af AL |
2785 | bio->bi_end_io = end_sync_write; |
2786 | write_targets++; | |
3e198f78 | 2787 | } |
3e198f78 | 2788 | } |
028288df | 2789 | if (rdev && bio->bi_end_io) { |
06f60385 | 2790 | atomic_inc(&rdev->nr_pending); |
4f024f37 | 2791 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
74d46992 | 2792 | bio_set_dev(bio, rdev->bdev); |
2e52d449 N |
2793 | if (test_bit(FailFast, &rdev->flags)) |
2794 | bio->bi_opf |= MD_FAILFAST; | |
06f60385 | 2795 | } |
1da177e4 | 2796 | } |
3e198f78 N |
2797 | if (disk < 0) |
2798 | disk = wonly; | |
2799 | r1_bio->read_disk = disk; | |
191ea9b2 | 2800 | |
06f60385 N |
2801 | if (read_targets == 0 && min_bad > 0) { |
2802 | /* These sectors are bad on all InSync devices, so we | |
2803 | * need to mark them bad on all write targets | |
2804 | */ | |
2805 | int ok = 1; | |
8f19ccb2 | 2806 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2807 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2808 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2809 | ok = rdev_set_badblocks(rdev, sector_nr, |
2810 | min_bad, 0 | |
2811 | ) && ok; | |
2812 | } | |
2953079c | 2813 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
06f60385 N |
2814 | *skipped = 1; |
2815 | put_buf(r1_bio); | |
2816 | ||
2817 | if (!ok) { | |
2818 | /* Cannot record the badblocks, so need to | |
2819 | * abort the resync. | |
2820 | * If there are multiple read targets, could just | |
2821 | * fail the really bad ones ??? | |
2822 | */ | |
2823 | conf->recovery_disabled = mddev->recovery_disabled; | |
2824 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2825 | return 0; | |
2826 | } else | |
2827 | return min_bad; | |
2828 | ||
2829 | } | |
2830 | if (min_bad > 0 && min_bad < good_sectors) { | |
2831 | /* only resync enough to reach the next bad->good | |
2832 | * transition */ | |
2833 | good_sectors = min_bad; | |
2834 | } | |
2835 | ||
3e198f78 N |
2836 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2837 | /* extra read targets are also write targets */ | |
2838 | write_targets += read_targets-1; | |
2839 | ||
2840 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2841 | /* There is nowhere to write, so all non-sync |
2842 | * drives must be failed - so we are finished | |
2843 | */ | |
b7219ccb N |
2844 | sector_t rv; |
2845 | if (min_bad > 0) | |
2846 | max_sector = sector_nr + min_bad; | |
2847 | rv = max_sector - sector_nr; | |
57afd89f | 2848 | *skipped = 1; |
1da177e4 | 2849 | put_buf(r1_bio); |
1da177e4 LT |
2850 | return rv; |
2851 | } | |
2852 | ||
c6207277 N |
2853 | if (max_sector > mddev->resync_max) |
2854 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2855 | if (max_sector > sector_nr + good_sectors) |
2856 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2857 | nr_sectors = 0; |
289e99e8 | 2858 | sync_blocks = 0; |
1da177e4 LT |
2859 | do { |
2860 | struct page *page; | |
2861 | int len = PAGE_SIZE; | |
2862 | if (sector_nr + (len>>9) > max_sector) | |
2863 | len = (max_sector - sector_nr) << 9; | |
2864 | if (len == 0) | |
2865 | break; | |
6a806c51 | 2866 | if (sync_blocks == 0) { |
e64e4018 AS |
2867 | if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, |
2868 | &sync_blocks, still_degraded) && | |
e5de485f N |
2869 | !conf->fullsync && |
2870 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2871 | break; |
7571ae88 | 2872 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2873 | len = sync_blocks<<9; |
ab7a30c7 | 2874 | } |
191ea9b2 | 2875 | |
8f19ccb2 | 2876 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
98d30c58 ML |
2877 | struct resync_pages *rp; |
2878 | ||
1da177e4 | 2879 | bio = r1_bio->bios[i]; |
98d30c58 | 2880 | rp = get_resync_pages(bio); |
1da177e4 | 2881 | if (bio->bi_end_io) { |
022e510f | 2882 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
2883 | |
2884 | /* | |
2885 | * won't fail because the vec table is big | |
2886 | * enough to hold all these pages | |
2887 | */ | |
f8312322 | 2888 | __bio_add_page(bio, page, len, 0); |
1da177e4 LT |
2889 | } |
2890 | } | |
2891 | nr_sectors += len>>9; | |
2892 | sector_nr += len>>9; | |
191ea9b2 | 2893 | sync_blocks -= (len>>9); |
022e510f | 2894 | } while (++page_idx < RESYNC_PAGES); |
98d30c58 | 2895 | |
1da177e4 LT |
2896 | r1_bio->sectors = nr_sectors; |
2897 | ||
c40f341f GR |
2898 | if (mddev_is_clustered(mddev) && |
2899 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2900 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2901 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2902 | /* Send resync message */ | |
2903 | md_cluster_ops->resync_info_update(mddev, | |
2904 | conf->cluster_sync_low, | |
2905 | conf->cluster_sync_high); | |
2906 | } | |
2907 | ||
d11c171e N |
2908 | /* For a user-requested sync, we read all readable devices and do a |
2909 | * compare | |
2910 | */ | |
2911 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2912 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2913 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2914 | bio = r1_bio->bios[i]; |
2915 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2916 | read_targets--; |
74d46992 | 2917 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2918 | if (read_targets == 1) |
2919 | bio->bi_opf &= ~MD_FAILFAST; | |
ed00aabd | 2920 | submit_bio_noacct(bio); |
d11c171e N |
2921 | } |
2922 | } | |
2923 | } else { | |
2924 | atomic_set(&r1_bio->remaining, 1); | |
2925 | bio = r1_bio->bios[r1_bio->read_disk]; | |
74d46992 | 2926 | md_sync_acct_bio(bio, nr_sectors); |
2e52d449 N |
2927 | if (read_targets == 1) |
2928 | bio->bi_opf &= ~MD_FAILFAST; | |
ed00aabd | 2929 | submit_bio_noacct(bio); |
d11c171e | 2930 | } |
1da177e4 LT |
2931 | return nr_sectors; |
2932 | } | |
2933 | ||
fd01b88c | 2934 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2935 | { |
2936 | if (sectors) | |
2937 | return sectors; | |
2938 | ||
2939 | return mddev->dev_sectors; | |
2940 | } | |
2941 | ||
e8096360 | 2942 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2943 | { |
e8096360 | 2944 | struct r1conf *conf; |
709ae487 | 2945 | int i; |
0eaf822c | 2946 | struct raid1_info *disk; |
3cb03002 | 2947 | struct md_rdev *rdev; |
709ae487 | 2948 | int err = -ENOMEM; |
1da177e4 | 2949 | |
e8096360 | 2950 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2951 | if (!conf) |
709ae487 | 2952 | goto abort; |
1da177e4 | 2953 | |
fd76863e | 2954 | conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, |
824e47da | 2955 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2956 | if (!conf->nr_pending) |
2957 | goto abort; | |
2958 | ||
2959 | conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2960 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2961 | if (!conf->nr_waiting) |
2962 | goto abort; | |
2963 | ||
2964 | conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2965 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2966 | if (!conf->nr_queued) |
2967 | goto abort; | |
2968 | ||
2969 | conf->barrier = kcalloc(BARRIER_BUCKETS_NR, | |
824e47da | 2970 | sizeof(atomic_t), GFP_KERNEL); |
fd76863e | 2971 | if (!conf->barrier) |
2972 | goto abort; | |
2973 | ||
6396bb22 KC |
2974 | conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
2975 | mddev->raid_disks, 2), | |
2976 | GFP_KERNEL); | |
1da177e4 | 2977 | if (!conf->mirrors) |
709ae487 | 2978 | goto abort; |
1da177e4 | 2979 | |
ddaf22ab N |
2980 | conf->tmppage = alloc_page(GFP_KERNEL); |
2981 | if (!conf->tmppage) | |
709ae487 | 2982 | goto abort; |
ddaf22ab | 2983 | |
709ae487 | 2984 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2985 | if (!conf->poolinfo) |
709ae487 | 2986 | goto abort; |
8f19ccb2 | 2987 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
3f677f9c | 2988 | err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 2989 | rbio_pool_free, conf->poolinfo); |
afeee514 | 2990 | if (err) |
709ae487 N |
2991 | goto abort; |
2992 | ||
afeee514 KO |
2993 | err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); |
2994 | if (err) | |
c230e7e5 N |
2995 | goto abort; |
2996 | ||
ed9bfdf1 | 2997 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2998 | |
c19d5798 | 2999 | err = -EINVAL; |
e7e72bf6 | 3000 | spin_lock_init(&conf->device_lock); |
dafb20fa | 3001 | rdev_for_each(rdev, mddev) { |
709ae487 | 3002 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
3003 | if (disk_idx >= mddev->raid_disks |
3004 | || disk_idx < 0) | |
3005 | continue; | |
c19d5798 | 3006 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 3007 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
3008 | else |
3009 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 3010 | |
c19d5798 N |
3011 | if (disk->rdev) |
3012 | goto abort; | |
1da177e4 | 3013 | disk->rdev = rdev; |
1da177e4 | 3014 | disk->head_position = 0; |
12cee5a8 | 3015 | disk->seq_start = MaxSector; |
1da177e4 LT |
3016 | } |
3017 | conf->raid_disks = mddev->raid_disks; | |
3018 | conf->mddev = mddev; | |
1da177e4 | 3019 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 3020 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
3021 | |
3022 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 3023 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 3024 | |
191ea9b2 | 3025 | bio_list_init(&conf->pending_bio_list); |
d890fa2b | 3026 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 3027 | |
c19d5798 | 3028 | err = -EIO; |
8f19ccb2 | 3029 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
3030 | |
3031 | disk = conf->mirrors + i; | |
3032 | ||
c19d5798 N |
3033 | if (i < conf->raid_disks && |
3034 | disk[conf->raid_disks].rdev) { | |
3035 | /* This slot has a replacement. */ | |
3036 | if (!disk->rdev) { | |
3037 | /* No original, just make the replacement | |
3038 | * a recovering spare | |
3039 | */ | |
3040 | disk->rdev = | |
3041 | disk[conf->raid_disks].rdev; | |
3042 | disk[conf->raid_disks].rdev = NULL; | |
3043 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
3044 | /* Original is not in_sync - bad */ | |
3045 | goto abort; | |
3046 | } | |
3047 | ||
5fd6c1dc N |
3048 | if (!disk->rdev || |
3049 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 3050 | disk->head_position = 0; |
4f0a5e01 JB |
3051 | if (disk->rdev && |
3052 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 3053 | conf->fullsync = 1; |
be4d3280 | 3054 | } |
1da177e4 | 3055 | } |
709ae487 | 3056 | |
709ae487 | 3057 | err = -ENOMEM; |
44693154 YK |
3058 | rcu_assign_pointer(conf->thread, |
3059 | md_register_thread(raid1d, mddev, "raid1")); | |
1d41c216 | 3060 | if (!conf->thread) |
709ae487 | 3061 | goto abort; |
1da177e4 | 3062 | |
709ae487 N |
3063 | return conf; |
3064 | ||
3065 | abort: | |
3066 | if (conf) { | |
afeee514 | 3067 | mempool_exit(&conf->r1bio_pool); |
709ae487 N |
3068 | kfree(conf->mirrors); |
3069 | safe_put_page(conf->tmppage); | |
3070 | kfree(conf->poolinfo); | |
fd76863e | 3071 | kfree(conf->nr_pending); |
3072 | kfree(conf->nr_waiting); | |
3073 | kfree(conf->nr_queued); | |
3074 | kfree(conf->barrier); | |
afeee514 | 3075 | bioset_exit(&conf->bio_split); |
709ae487 N |
3076 | kfree(conf); |
3077 | } | |
3078 | return ERR_PTR(err); | |
3079 | } | |
3080 | ||
afa0f557 | 3081 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 3082 | static int raid1_run(struct mddev *mddev) |
709ae487 | 3083 | { |
e8096360 | 3084 | struct r1conf *conf; |
709ae487 | 3085 | int i; |
3cb03002 | 3086 | struct md_rdev *rdev; |
5220ea1e | 3087 | int ret; |
709ae487 N |
3088 | |
3089 | if (mddev->level != 1) { | |
1d41c216 N |
3090 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
3091 | mdname(mddev), mddev->level); | |
709ae487 N |
3092 | return -EIO; |
3093 | } | |
3094 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
3095 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
3096 | mdname(mddev)); | |
709ae487 N |
3097 | return -EIO; |
3098 | } | |
b8494823 | 3099 | |
1da177e4 | 3100 | /* |
709ae487 N |
3101 | * copy the already verified devices into our private RAID1 |
3102 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 3103 | * should be freed in raid1_free()] |
1da177e4 | 3104 | */ |
709ae487 N |
3105 | if (mddev->private == NULL) |
3106 | conf = setup_conf(mddev); | |
3107 | else | |
3108 | conf = mddev->private; | |
1da177e4 | 3109 | |
709ae487 N |
3110 | if (IS_ERR(conf)) |
3111 | return PTR_ERR(conf); | |
1da177e4 | 3112 | |
10fa225c | 3113 | if (mddev->queue) |
3deff1a7 | 3114 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
5026d7a9 | 3115 | |
dafb20fa | 3116 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
3117 | if (!mddev->gendisk) |
3118 | continue; | |
709ae487 N |
3119 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
3120 | rdev->data_offset << 9); | |
1da177e4 | 3121 | } |
191ea9b2 | 3122 | |
709ae487 | 3123 | mddev->degraded = 0; |
ebfeb444 | 3124 | for (i = 0; i < conf->raid_disks; i++) |
709ae487 N |
3125 | if (conf->mirrors[i].rdev == NULL || |
3126 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
3127 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
3128 | mddev->degraded++; | |
07f1a685 YY |
3129 | /* |
3130 | * RAID1 needs at least one disk in active | |
3131 | */ | |
3132 | if (conf->raid_disks - mddev->degraded < 1) { | |
7eb8ff02 | 3133 | md_unregister_thread(mddev, &conf->thread); |
07f1a685 YY |
3134 | ret = -EINVAL; |
3135 | goto abort; | |
3136 | } | |
709ae487 N |
3137 | |
3138 | if (conf->raid_disks - mddev->degraded == 1) | |
3139 | mddev->recovery_cp = MaxSector; | |
3140 | ||
8c6ac868 | 3141 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
3142 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
3143 | mdname(mddev)); | |
3144 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 3145 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 3146 | mddev->raid_disks); |
709ae487 | 3147 | |
1da177e4 LT |
3148 | /* |
3149 | * Ok, everything is just fine now | |
3150 | */ | |
44693154 YK |
3151 | rcu_assign_pointer(mddev->thread, conf->thread); |
3152 | rcu_assign_pointer(conf->thread, NULL); | |
709ae487 | 3153 | mddev->private = conf; |
46533ff7 | 3154 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
709ae487 | 3155 | |
1f403624 | 3156 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 3157 | |
ebfeb444 | 3158 | ret = md_integrity_register(mddev); |
5aa61f42 | 3159 | if (ret) { |
7eb8ff02 | 3160 | md_unregister_thread(mddev, &mddev->thread); |
07f1a685 | 3161 | goto abort; |
5aa61f42 | 3162 | } |
07f1a685 YY |
3163 | return 0; |
3164 | ||
3165 | abort: | |
3166 | raid1_free(mddev, conf); | |
5220ea1e | 3167 | return ret; |
1da177e4 LT |
3168 | } |
3169 | ||
afa0f557 | 3170 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 3171 | { |
afa0f557 | 3172 | struct r1conf *conf = priv; |
409c57f3 | 3173 | |
afeee514 | 3174 | mempool_exit(&conf->r1bio_pool); |
990a8baf | 3175 | kfree(conf->mirrors); |
0fea7ed8 | 3176 | safe_put_page(conf->tmppage); |
990a8baf | 3177 | kfree(conf->poolinfo); |
fd76863e | 3178 | kfree(conf->nr_pending); |
3179 | kfree(conf->nr_waiting); | |
3180 | kfree(conf->nr_queued); | |
3181 | kfree(conf->barrier); | |
afeee514 | 3182 | bioset_exit(&conf->bio_split); |
1da177e4 | 3183 | kfree(conf); |
1da177e4 LT |
3184 | } |
3185 | ||
fd01b88c | 3186 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
3187 | { |
3188 | /* no resync is happening, and there is enough space | |
3189 | * on all devices, so we can resize. | |
3190 | * We need to make sure resync covers any new space. | |
3191 | * If the array is shrinking we should possibly wait until | |
3192 | * any io in the removed space completes, but it hardly seems | |
3193 | * worth it. | |
3194 | */ | |
a4a6125a N |
3195 | sector_t newsize = raid1_size(mddev, sectors, 0); |
3196 | if (mddev->external_size && | |
3197 | mddev->array_sectors > newsize) | |
b522adcd | 3198 | return -EINVAL; |
a4a6125a | 3199 | if (mddev->bitmap) { |
e64e4018 | 3200 | int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); |
a4a6125a N |
3201 | if (ret) |
3202 | return ret; | |
3203 | } | |
3204 | md_set_array_sectors(mddev, newsize); | |
b522adcd | 3205 | if (sectors > mddev->dev_sectors && |
b098636c | 3206 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3207 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3208 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3209 | } | |
b522adcd | 3210 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3211 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3212 | return 0; |
3213 | } | |
3214 | ||
fd01b88c | 3215 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3216 | { |
3217 | /* We need to: | |
3218 | * 1/ resize the r1bio_pool | |
3219 | * 2/ resize conf->mirrors | |
3220 | * | |
3221 | * We allocate a new r1bio_pool if we can. | |
3222 | * Then raise a device barrier and wait until all IO stops. | |
3223 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3224 | * |
3225 | * At the same time, we "pack" the devices so that all the missing | |
3226 | * devices have the higher raid_disk numbers. | |
1da177e4 | 3227 | */ |
afeee514 | 3228 | mempool_t newpool, oldpool; |
1da177e4 | 3229 | struct pool_info *newpoolinfo; |
0eaf822c | 3230 | struct raid1_info *newmirrors; |
e8096360 | 3231 | struct r1conf *conf = mddev->private; |
63c70c4f | 3232 | int cnt, raid_disks; |
c04be0aa | 3233 | unsigned long flags; |
2214c260 | 3234 | int d, d2; |
afeee514 KO |
3235 | int ret; |
3236 | ||
3237 | memset(&newpool, 0, sizeof(newpool)); | |
3238 | memset(&oldpool, 0, sizeof(oldpool)); | |
1da177e4 | 3239 | |
63c70c4f | 3240 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3241 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3242 | mddev->layout != mddev->new_layout || |
3243 | mddev->level != mddev->new_level) { | |
664e7c41 | 3244 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3245 | mddev->new_layout = mddev->layout; |
3246 | mddev->new_level = mddev->level; | |
3247 | return -EINVAL; | |
3248 | } | |
3249 | ||
2214c260 AP |
3250 | if (!mddev_is_clustered(mddev)) |
3251 | md_allow_write(mddev); | |
2a2275d6 | 3252 | |
63c70c4f N |
3253 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3254 | ||
6ea9c07c N |
3255 | if (raid_disks < conf->raid_disks) { |
3256 | cnt=0; | |
3257 | for (d= 0; d < conf->raid_disks; d++) | |
3258 | if (conf->mirrors[d].rdev) | |
3259 | cnt++; | |
3260 | if (cnt > raid_disks) | |
1da177e4 | 3261 | return -EBUSY; |
6ea9c07c | 3262 | } |
1da177e4 LT |
3263 | |
3264 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3265 | if (!newpoolinfo) | |
3266 | return -ENOMEM; | |
3267 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3268 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 | 3269 | |
3f677f9c | 3270 | ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, |
c7afa803 | 3271 | rbio_pool_free, newpoolinfo); |
afeee514 | 3272 | if (ret) { |
1da177e4 | 3273 | kfree(newpoolinfo); |
afeee514 | 3274 | return ret; |
1da177e4 | 3275 | } |
6396bb22 KC |
3276 | newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), |
3277 | raid_disks, 2), | |
8f19ccb2 | 3278 | GFP_KERNEL); |
1da177e4 LT |
3279 | if (!newmirrors) { |
3280 | kfree(newpoolinfo); | |
afeee514 | 3281 | mempool_exit(&newpool); |
1da177e4 LT |
3282 | return -ENOMEM; |
3283 | } | |
1da177e4 | 3284 | |
e2d59925 | 3285 | freeze_array(conf, 0); |
1da177e4 LT |
3286 | |
3287 | /* ok, everything is stopped */ | |
3288 | oldpool = conf->r1bio_pool; | |
3289 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3290 | |
a88aa786 | 3291 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3292 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3293 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3294 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3295 | rdev->raid_disk = d2; |
36fad858 NK |
3296 | sysfs_unlink_rdev(mddev, rdev); |
3297 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3298 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3299 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3300 | } |
a88aa786 N |
3301 | if (rdev) |
3302 | newmirrors[d2++].rdev = rdev; | |
3303 | } | |
1da177e4 LT |
3304 | kfree(conf->mirrors); |
3305 | conf->mirrors = newmirrors; | |
3306 | kfree(conf->poolinfo); | |
3307 | conf->poolinfo = newpoolinfo; | |
3308 | ||
c04be0aa | 3309 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3310 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3311 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3312 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3313 | mddev->delta_disks = 0; |
1da177e4 | 3314 | |
e2d59925 | 3315 | unfreeze_array(conf); |
1da177e4 | 3316 | |
985ca973 | 3317 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3318 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3319 | md_wakeup_thread(mddev->thread); | |
3320 | ||
afeee514 | 3321 | mempool_exit(&oldpool); |
1da177e4 LT |
3322 | return 0; |
3323 | } | |
3324 | ||
b03e0ccb | 3325 | static void raid1_quiesce(struct mddev *mddev, int quiesce) |
36fa3063 | 3326 | { |
e8096360 | 3327 | struct r1conf *conf = mddev->private; |
36fa3063 | 3328 | |
b03e0ccb | 3329 | if (quiesce) |
07169fd4 | 3330 | freeze_array(conf, 0); |
b03e0ccb | 3331 | else |
07169fd4 | 3332 | unfreeze_array(conf); |
36fa3063 N |
3333 | } |
3334 | ||
fd01b88c | 3335 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3336 | { |
3337 | /* raid1 can take over: | |
3338 | * raid5 with 2 devices, any layout or chunk size | |
3339 | */ | |
3340 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3341 | struct r1conf *conf; |
709ae487 N |
3342 | mddev->new_level = 1; |
3343 | mddev->new_layout = 0; | |
3344 | mddev->new_chunk_sectors = 0; | |
3345 | conf = setup_conf(mddev); | |
6995f0b2 | 3346 | if (!IS_ERR(conf)) { |
07169fd4 | 3347 | /* Array must appear to be quiesced */ |
3348 | conf->array_frozen = 1; | |
394ed8e4 SL |
3349 | mddev_clear_unsupported_flags(mddev, |
3350 | UNSUPPORTED_MDDEV_FLAGS); | |
6995f0b2 | 3351 | } |
709ae487 N |
3352 | return conf; |
3353 | } | |
3354 | return ERR_PTR(-EINVAL); | |
3355 | } | |
1da177e4 | 3356 | |
84fc4b56 | 3357 | static struct md_personality raid1_personality = |
1da177e4 LT |
3358 | { |
3359 | .name = "raid1", | |
2604b703 | 3360 | .level = 1, |
1da177e4 | 3361 | .owner = THIS_MODULE, |
849674e4 SL |
3362 | .make_request = raid1_make_request, |
3363 | .run = raid1_run, | |
afa0f557 | 3364 | .free = raid1_free, |
849674e4 SL |
3365 | .status = raid1_status, |
3366 | .error_handler = raid1_error, | |
1da177e4 LT |
3367 | .hot_add_disk = raid1_add_disk, |
3368 | .hot_remove_disk= raid1_remove_disk, | |
3369 | .spare_active = raid1_spare_active, | |
849674e4 | 3370 | .sync_request = raid1_sync_request, |
1da177e4 | 3371 | .resize = raid1_resize, |
80c3a6ce | 3372 | .size = raid1_size, |
63c70c4f | 3373 | .check_reshape = raid1_reshape, |
36fa3063 | 3374 | .quiesce = raid1_quiesce, |
709ae487 | 3375 | .takeover = raid1_takeover, |
1da177e4 LT |
3376 | }; |
3377 | ||
3378 | static int __init raid_init(void) | |
3379 | { | |
2604b703 | 3380 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3381 | } |
3382 | ||
3383 | static void raid_exit(void) | |
3384 | { | |
2604b703 | 3385 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3386 | } |
3387 | ||
3388 | module_init(raid_init); | |
3389 | module_exit(raid_exit); | |
3390 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3391 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3392 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3393 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3394 | MODULE_ALIAS("md-level-1"); |