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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
43b2e5d8 | 40 | #include "md.h" |
ef740c37 CH |
41 | #include "raid1.h" |
42 | #include "bitmap.h" | |
191ea9b2 | 43 | |
1da177e4 LT |
44 | /* |
45 | * Number of guaranteed r1bios in case of extreme VM load: | |
46 | */ | |
47 | #define NR_RAID1_BIOS 256 | |
48 | ||
473e87ce JB |
49 | /* when we get a read error on a read-only array, we redirect to another |
50 | * device without failing the first device, or trying to over-write to | |
51 | * correct the read error. To keep track of bad blocks on a per-bio | |
52 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
53 | */ | |
54 | #define IO_BLOCKED ((struct bio *)1) | |
55 | /* When we successfully write to a known bad-block, we need to remove the | |
56 | * bad-block marking which must be done from process context. So we record | |
57 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
58 | */ | |
59 | #define IO_MADE_GOOD ((struct bio *)2) | |
60 | ||
61 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
62 | ||
34db0cd6 N |
63 | /* When there are this many requests queue to be written by |
64 | * the raid1 thread, we become 'congested' to provide back-pressure | |
65 | * for writeback. | |
66 | */ | |
67 | static int max_queued_requests = 1024; | |
1da177e4 | 68 | |
e8096360 N |
69 | static void allow_barrier(struct r1conf *conf); |
70 | static void lower_barrier(struct r1conf *conf); | |
1da177e4 | 71 | |
dd0fc66f | 72 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
73 | { |
74 | struct pool_info *pi = data; | |
9f2c9d12 | 75 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
76 | |
77 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 78 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
79 | } |
80 | ||
81 | static void r1bio_pool_free(void *r1_bio, void *data) | |
82 | { | |
83 | kfree(r1_bio); | |
84 | } | |
85 | ||
86 | #define RESYNC_BLOCK_SIZE (64*1024) | |
87 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
88 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
89 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
90 | #define RESYNC_WINDOW (2048*1024) | |
91 | ||
dd0fc66f | 92 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
93 | { |
94 | struct pool_info *pi = data; | |
9f2c9d12 | 95 | struct r1bio *r1_bio; |
1da177e4 LT |
96 | struct bio *bio; |
97 | int i, j; | |
98 | ||
99 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 100 | if (!r1_bio) |
1da177e4 | 101 | return NULL; |
1da177e4 LT |
102 | |
103 | /* | |
104 | * Allocate bios : 1 for reading, n-1 for writing | |
105 | */ | |
106 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 107 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
108 | if (!bio) |
109 | goto out_free_bio; | |
110 | r1_bio->bios[j] = bio; | |
111 | } | |
112 | /* | |
113 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
114 | * the first bio. |
115 | * If this is a user-requested check/repair, allocate | |
116 | * RESYNC_PAGES for each bio. | |
1da177e4 | 117 | */ |
d11c171e N |
118 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
119 | j = pi->raid_disks; | |
120 | else | |
121 | j = 1; | |
122 | while(j--) { | |
123 | bio = r1_bio->bios[j]; | |
a0787606 | 124 | bio->bi_vcnt = RESYNC_PAGES; |
d11c171e | 125 | |
a0787606 KO |
126 | if (bio_alloc_pages(bio, gfp_flags)) |
127 | goto out_free_bio; | |
d11c171e N |
128 | } |
129 | /* If not user-requests, copy the page pointers to all bios */ | |
130 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
131 | for (i=0; i<RESYNC_PAGES ; i++) | |
132 | for (j=1; j<pi->raid_disks; j++) | |
133 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
134 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
135 | } |
136 | ||
137 | r1_bio->master_bio = NULL; | |
138 | ||
139 | return r1_bio; | |
140 | ||
1da177e4 | 141 | out_free_bio: |
8f19ccb2 | 142 | while (++j < pi->raid_disks) |
1da177e4 LT |
143 | bio_put(r1_bio->bios[j]); |
144 | r1bio_pool_free(r1_bio, data); | |
145 | return NULL; | |
146 | } | |
147 | ||
148 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
149 | { | |
150 | struct pool_info *pi = data; | |
d11c171e | 151 | int i,j; |
9f2c9d12 | 152 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 153 | |
d11c171e N |
154 | for (i = 0; i < RESYNC_PAGES; i++) |
155 | for (j = pi->raid_disks; j-- ;) { | |
156 | if (j == 0 || | |
157 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
158 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 159 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 160 | } |
1da177e4 LT |
161 | for (i=0 ; i < pi->raid_disks; i++) |
162 | bio_put(r1bio->bios[i]); | |
163 | ||
164 | r1bio_pool_free(r1bio, data); | |
165 | } | |
166 | ||
e8096360 | 167 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
168 | { |
169 | int i; | |
170 | ||
8f19ccb2 | 171 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 172 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 173 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
174 | bio_put(*bio); |
175 | *bio = NULL; | |
176 | } | |
177 | } | |
178 | ||
9f2c9d12 | 179 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 180 | { |
e8096360 | 181 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 182 | |
1da177e4 LT |
183 | put_all_bios(conf, r1_bio); |
184 | mempool_free(r1_bio, conf->r1bio_pool); | |
185 | } | |
186 | ||
9f2c9d12 | 187 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 188 | { |
e8096360 | 189 | struct r1conf *conf = r1_bio->mddev->private; |
3e198f78 N |
190 | int i; |
191 | ||
8f19ccb2 | 192 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
193 | struct bio *bio = r1_bio->bios[i]; |
194 | if (bio->bi_end_io) | |
195 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
196 | } | |
1da177e4 LT |
197 | |
198 | mempool_free(r1_bio, conf->r1buf_pool); | |
199 | ||
17999be4 | 200 | lower_barrier(conf); |
1da177e4 LT |
201 | } |
202 | ||
9f2c9d12 | 203 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
204 | { |
205 | unsigned long flags; | |
fd01b88c | 206 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 207 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
208 | |
209 | spin_lock_irqsave(&conf->device_lock, flags); | |
210 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 211 | conf->nr_queued ++; |
1da177e4 LT |
212 | spin_unlock_irqrestore(&conf->device_lock, flags); |
213 | ||
17999be4 | 214 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
215 | md_wakeup_thread(mddev->thread); |
216 | } | |
217 | ||
218 | /* | |
219 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
220 | * operation and are ready to return a success/failure code to the buffer | |
221 | * cache layer. | |
222 | */ | |
9f2c9d12 | 223 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
224 | { |
225 | struct bio *bio = r1_bio->master_bio; | |
226 | int done; | |
e8096360 | 227 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
228 | |
229 | if (bio->bi_phys_segments) { | |
230 | unsigned long flags; | |
231 | spin_lock_irqsave(&conf->device_lock, flags); | |
232 | bio->bi_phys_segments--; | |
233 | done = (bio->bi_phys_segments == 0); | |
234 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
235 | } else | |
236 | done = 1; | |
237 | ||
238 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
239 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
240 | if (done) { | |
241 | bio_endio(bio, 0); | |
242 | /* | |
243 | * Wake up any possible resync thread that waits for the device | |
244 | * to go idle. | |
245 | */ | |
246 | allow_barrier(conf); | |
247 | } | |
248 | } | |
249 | ||
9f2c9d12 | 250 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
251 | { |
252 | struct bio *bio = r1_bio->master_bio; | |
253 | ||
4b6d287f N |
254 | /* if nobody has done the final endio yet, do it now */ |
255 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
256 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
257 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
258 | (unsigned long long) bio->bi_sector, | |
259 | (unsigned long long) bio->bi_sector + | |
aa8b57aa | 260 | bio_sectors(bio) - 1); |
4b6d287f | 261 | |
d2eb35ac | 262 | call_bio_endio(r1_bio); |
4b6d287f | 263 | } |
1da177e4 LT |
264 | free_r1bio(r1_bio); |
265 | } | |
266 | ||
267 | /* | |
268 | * Update disk head position estimator based on IRQ completion info. | |
269 | */ | |
9f2c9d12 | 270 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 271 | { |
e8096360 | 272 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
273 | |
274 | conf->mirrors[disk].head_position = | |
275 | r1_bio->sector + (r1_bio->sectors); | |
276 | } | |
277 | ||
ba3ae3be NK |
278 | /* |
279 | * Find the disk number which triggered given bio | |
280 | */ | |
9f2c9d12 | 281 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
282 | { |
283 | int mirror; | |
30194636 N |
284 | struct r1conf *conf = r1_bio->mddev->private; |
285 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 286 | |
8f19ccb2 | 287 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
288 | if (r1_bio->bios[mirror] == bio) |
289 | break; | |
290 | ||
8f19ccb2 | 291 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
292 | update_head_pos(mirror, r1_bio); |
293 | ||
294 | return mirror; | |
295 | } | |
296 | ||
6712ecf8 | 297 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
298 | { |
299 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 300 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 301 | int mirror; |
e8096360 | 302 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 303 | |
1da177e4 LT |
304 | mirror = r1_bio->read_disk; |
305 | /* | |
306 | * this branch is our 'one mirror IO has finished' event handler: | |
307 | */ | |
ddaf22ab N |
308 | update_head_pos(mirror, r1_bio); |
309 | ||
dd00a99e N |
310 | if (uptodate) |
311 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
312 | else { | |
313 | /* If all other devices have failed, we want to return | |
314 | * the error upwards rather than fail the last device. | |
315 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 316 | */ |
dd00a99e N |
317 | unsigned long flags; |
318 | spin_lock_irqsave(&conf->device_lock, flags); | |
319 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
320 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
321 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
322 | uptodate = 1; | |
323 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
324 | } | |
1da177e4 | 325 | |
7ad4d4a6 | 326 | if (uptodate) { |
1da177e4 | 327 | raid_end_bio_io(r1_bio); |
7ad4d4a6 N |
328 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
329 | } else { | |
1da177e4 LT |
330 | /* |
331 | * oops, read error: | |
332 | */ | |
333 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
334 | printk_ratelimited( |
335 | KERN_ERR "md/raid1:%s: %s: " | |
336 | "rescheduling sector %llu\n", | |
337 | mdname(conf->mddev), | |
338 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
339 | b), | |
340 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 341 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 342 | reschedule_retry(r1_bio); |
7ad4d4a6 | 343 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 344 | } |
1da177e4 LT |
345 | } |
346 | ||
9f2c9d12 | 347 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
348 | { |
349 | /* it really is the end of this request */ | |
350 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
351 | /* free extra copy of the data pages */ | |
352 | int i = r1_bio->behind_page_count; | |
353 | while (i--) | |
354 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
355 | kfree(r1_bio->behind_bvecs); | |
356 | r1_bio->behind_bvecs = NULL; | |
357 | } | |
358 | /* clear the bitmap if all writes complete successfully */ | |
359 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
360 | r1_bio->sectors, | |
361 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
362 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
363 | md_write_end(r1_bio->mddev); | |
364 | } | |
365 | ||
9f2c9d12 | 366 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 367 | { |
cd5ff9a1 N |
368 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
369 | return; | |
370 | ||
371 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
372 | reschedule_retry(r1_bio); | |
373 | else { | |
374 | close_write(r1_bio); | |
4367af55 N |
375 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
376 | reschedule_retry(r1_bio); | |
377 | else | |
378 | raid_end_bio_io(r1_bio); | |
4e78064f N |
379 | } |
380 | } | |
381 | ||
6712ecf8 | 382 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
383 | { |
384 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 385 | struct r1bio *r1_bio = bio->bi_private; |
a9701a30 | 386 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 387 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 388 | struct bio *to_put = NULL; |
1da177e4 | 389 | |
ba3ae3be | 390 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 391 | |
e9c7469b TH |
392 | /* |
393 | * 'one mirror IO has finished' event handler: | |
394 | */ | |
e9c7469b | 395 | if (!uptodate) { |
cd5ff9a1 N |
396 | set_bit(WriteErrorSeen, |
397 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
398 | if (!test_and_set_bit(WantReplacement, |
399 | &conf->mirrors[mirror].rdev->flags)) | |
400 | set_bit(MD_RECOVERY_NEEDED, & | |
401 | conf->mddev->recovery); | |
402 | ||
cd5ff9a1 | 403 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 | 404 | } else { |
1da177e4 | 405 | /* |
e9c7469b TH |
406 | * Set R1BIO_Uptodate in our master bio, so that we |
407 | * will return a good error code for to the higher | |
408 | * levels even if IO on some other mirrored buffer | |
409 | * fails. | |
410 | * | |
411 | * The 'master' represents the composite IO operation | |
412 | * to user-side. So if something waits for IO, then it | |
413 | * will wait for the 'master' bio. | |
1da177e4 | 414 | */ |
4367af55 N |
415 | sector_t first_bad; |
416 | int bad_sectors; | |
417 | ||
cd5ff9a1 N |
418 | r1_bio->bios[mirror] = NULL; |
419 | to_put = bio; | |
3056e3ae AL |
420 | /* |
421 | * Do not set R1BIO_Uptodate if the current device is | |
422 | * rebuilding or Faulty. This is because we cannot use | |
423 | * such device for properly reading the data back (we could | |
424 | * potentially use it, if the current write would have felt | |
425 | * before rdev->recovery_offset, but for simplicity we don't | |
426 | * check this here. | |
427 | */ | |
428 | if (test_bit(In_sync, &conf->mirrors[mirror].rdev->flags) && | |
429 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)) | |
430 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
e9c7469b | 431 | |
4367af55 N |
432 | /* Maybe we can clear some bad blocks. */ |
433 | if (is_badblock(conf->mirrors[mirror].rdev, | |
434 | r1_bio->sector, r1_bio->sectors, | |
435 | &first_bad, &bad_sectors)) { | |
436 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
437 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
438 | } | |
439 | } | |
440 | ||
e9c7469b TH |
441 | if (behind) { |
442 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
443 | atomic_dec(&r1_bio->behind_remaining); | |
444 | ||
445 | /* | |
446 | * In behind mode, we ACK the master bio once the I/O | |
447 | * has safely reached all non-writemostly | |
448 | * disks. Setting the Returned bit ensures that this | |
449 | * gets done only once -- we don't ever want to return | |
450 | * -EIO here, instead we'll wait | |
451 | */ | |
452 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
453 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
454 | /* Maybe we can return now */ | |
455 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
456 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
457 | pr_debug("raid1: behind end write sectors" |
458 | " %llu-%llu\n", | |
459 | (unsigned long long) mbio->bi_sector, | |
460 | (unsigned long long) mbio->bi_sector + | |
aa8b57aa | 461 | bio_sectors(mbio) - 1); |
d2eb35ac | 462 | call_bio_endio(r1_bio); |
4b6d287f N |
463 | } |
464 | } | |
465 | } | |
4367af55 N |
466 | if (r1_bio->bios[mirror] == NULL) |
467 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
468 | conf->mddev); | |
e9c7469b | 469 | |
1da177e4 | 470 | /* |
1da177e4 LT |
471 | * Let's see if all mirrored write operations have finished |
472 | * already. | |
473 | */ | |
af6d7b76 | 474 | r1_bio_write_done(r1_bio); |
c70810b3 | 475 | |
04b857f7 N |
476 | if (to_put) |
477 | bio_put(to_put); | |
1da177e4 LT |
478 | } |
479 | ||
480 | ||
481 | /* | |
482 | * This routine returns the disk from which the requested read should | |
483 | * be done. There is a per-array 'next expected sequential IO' sector | |
484 | * number - if this matches on the next IO then we use the last disk. | |
485 | * There is also a per-disk 'last know head position' sector that is | |
486 | * maintained from IRQ contexts, both the normal and the resync IO | |
487 | * completion handlers update this position correctly. If there is no | |
488 | * perfect sequential match then we pick the disk whose head is closest. | |
489 | * | |
490 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
491 | * because position is mirror, not device based. | |
492 | * | |
493 | * The rdev for the device selected will have nr_pending incremented. | |
494 | */ | |
e8096360 | 495 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 496 | { |
af3a2cd6 | 497 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
498 | int sectors; |
499 | int best_good_sectors; | |
9dedf603 SL |
500 | int best_disk, best_dist_disk, best_pending_disk; |
501 | int has_nonrot_disk; | |
be4d3280 | 502 | int disk; |
76073054 | 503 | sector_t best_dist; |
9dedf603 | 504 | unsigned int min_pending; |
3cb03002 | 505 | struct md_rdev *rdev; |
f3ac8bf7 | 506 | int choose_first; |
12cee5a8 | 507 | int choose_next_idle; |
1da177e4 LT |
508 | |
509 | rcu_read_lock(); | |
510 | /* | |
8ddf9efe | 511 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
512 | * device if no resync is going on, or below the resync window. |
513 | * We take the first readable disk when above the resync window. | |
514 | */ | |
515 | retry: | |
d2eb35ac | 516 | sectors = r1_bio->sectors; |
76073054 | 517 | best_disk = -1; |
9dedf603 | 518 | best_dist_disk = -1; |
76073054 | 519 | best_dist = MaxSector; |
9dedf603 SL |
520 | best_pending_disk = -1; |
521 | min_pending = UINT_MAX; | |
d2eb35ac | 522 | best_good_sectors = 0; |
9dedf603 | 523 | has_nonrot_disk = 0; |
12cee5a8 | 524 | choose_next_idle = 0; |
d2eb35ac | 525 | |
1da177e4 | 526 | if (conf->mddev->recovery_cp < MaxSector && |
be4d3280 | 527 | (this_sector + sectors >= conf->next_resync)) |
f3ac8bf7 | 528 | choose_first = 1; |
be4d3280 | 529 | else |
f3ac8bf7 | 530 | choose_first = 0; |
1da177e4 | 531 | |
be4d3280 | 532 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 533 | sector_t dist; |
d2eb35ac N |
534 | sector_t first_bad; |
535 | int bad_sectors; | |
9dedf603 | 536 | unsigned int pending; |
12cee5a8 | 537 | bool nonrot; |
d2eb35ac | 538 | |
f3ac8bf7 N |
539 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
540 | if (r1_bio->bios[disk] == IO_BLOCKED | |
541 | || rdev == NULL | |
6b740b8d | 542 | || test_bit(Unmerged, &rdev->flags) |
76073054 | 543 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 544 | continue; |
76073054 N |
545 | if (!test_bit(In_sync, &rdev->flags) && |
546 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 547 | continue; |
76073054 N |
548 | if (test_bit(WriteMostly, &rdev->flags)) { |
549 | /* Don't balance among write-mostly, just | |
550 | * use the first as a last resort */ | |
307729c8 N |
551 | if (best_disk < 0) { |
552 | if (is_badblock(rdev, this_sector, sectors, | |
553 | &first_bad, &bad_sectors)) { | |
554 | if (first_bad < this_sector) | |
555 | /* Cannot use this */ | |
556 | continue; | |
557 | best_good_sectors = first_bad - this_sector; | |
558 | } else | |
559 | best_good_sectors = sectors; | |
76073054 | 560 | best_disk = disk; |
307729c8 | 561 | } |
76073054 N |
562 | continue; |
563 | } | |
564 | /* This is a reasonable device to use. It might | |
565 | * even be best. | |
566 | */ | |
d2eb35ac N |
567 | if (is_badblock(rdev, this_sector, sectors, |
568 | &first_bad, &bad_sectors)) { | |
569 | if (best_dist < MaxSector) | |
570 | /* already have a better device */ | |
571 | continue; | |
572 | if (first_bad <= this_sector) { | |
573 | /* cannot read here. If this is the 'primary' | |
574 | * device, then we must not read beyond | |
575 | * bad_sectors from another device.. | |
576 | */ | |
577 | bad_sectors -= (this_sector - first_bad); | |
578 | if (choose_first && sectors > bad_sectors) | |
579 | sectors = bad_sectors; | |
580 | if (best_good_sectors > sectors) | |
581 | best_good_sectors = sectors; | |
582 | ||
583 | } else { | |
584 | sector_t good_sectors = first_bad - this_sector; | |
585 | if (good_sectors > best_good_sectors) { | |
586 | best_good_sectors = good_sectors; | |
587 | best_disk = disk; | |
588 | } | |
589 | if (choose_first) | |
590 | break; | |
591 | } | |
592 | continue; | |
593 | } else | |
594 | best_good_sectors = sectors; | |
595 | ||
12cee5a8 SL |
596 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
597 | has_nonrot_disk |= nonrot; | |
9dedf603 | 598 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 599 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 600 | if (choose_first) { |
76073054 | 601 | best_disk = disk; |
1da177e4 LT |
602 | break; |
603 | } | |
12cee5a8 SL |
604 | /* Don't change to another disk for sequential reads */ |
605 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
606 | || dist == 0) { | |
607 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
608 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
609 | ||
610 | best_disk = disk; | |
611 | /* | |
612 | * If buffered sequential IO size exceeds optimal | |
613 | * iosize, check if there is idle disk. If yes, choose | |
614 | * the idle disk. read_balance could already choose an | |
615 | * idle disk before noticing it's a sequential IO in | |
616 | * this disk. This doesn't matter because this disk | |
617 | * will idle, next time it will be utilized after the | |
618 | * first disk has IO size exceeds optimal iosize. In | |
619 | * this way, iosize of the first disk will be optimal | |
620 | * iosize at least. iosize of the second disk might be | |
621 | * small, but not a big deal since when the second disk | |
622 | * starts IO, the first disk is likely still busy. | |
623 | */ | |
624 | if (nonrot && opt_iosize > 0 && | |
625 | mirror->seq_start != MaxSector && | |
626 | mirror->next_seq_sect > opt_iosize && | |
627 | mirror->next_seq_sect - opt_iosize >= | |
628 | mirror->seq_start) { | |
629 | choose_next_idle = 1; | |
630 | continue; | |
631 | } | |
632 | break; | |
633 | } | |
634 | /* If device is idle, use it */ | |
635 | if (pending == 0) { | |
636 | best_disk = disk; | |
637 | break; | |
638 | } | |
639 | ||
640 | if (choose_next_idle) | |
641 | continue; | |
9dedf603 SL |
642 | |
643 | if (min_pending > pending) { | |
644 | min_pending = pending; | |
645 | best_pending_disk = disk; | |
646 | } | |
647 | ||
76073054 N |
648 | if (dist < best_dist) { |
649 | best_dist = dist; | |
9dedf603 | 650 | best_dist_disk = disk; |
1da177e4 | 651 | } |
f3ac8bf7 | 652 | } |
1da177e4 | 653 | |
9dedf603 SL |
654 | /* |
655 | * If all disks are rotational, choose the closest disk. If any disk is | |
656 | * non-rotational, choose the disk with less pending request even the | |
657 | * disk is rotational, which might/might not be optimal for raids with | |
658 | * mixed ratation/non-rotational disks depending on workload. | |
659 | */ | |
660 | if (best_disk == -1) { | |
661 | if (has_nonrot_disk) | |
662 | best_disk = best_pending_disk; | |
663 | else | |
664 | best_disk = best_dist_disk; | |
665 | } | |
666 | ||
76073054 N |
667 | if (best_disk >= 0) { |
668 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
669 | if (!rdev) |
670 | goto retry; | |
671 | atomic_inc(&rdev->nr_pending); | |
76073054 | 672 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
673 | /* cannot risk returning a device that failed |
674 | * before we inc'ed nr_pending | |
675 | */ | |
03c902e1 | 676 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
677 | goto retry; |
678 | } | |
d2eb35ac | 679 | sectors = best_good_sectors; |
12cee5a8 SL |
680 | |
681 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
682 | conf->mirrors[best_disk].seq_start = this_sector; | |
683 | ||
be4d3280 | 684 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
685 | } |
686 | rcu_read_unlock(); | |
d2eb35ac | 687 | *max_sectors = sectors; |
1da177e4 | 688 | |
76073054 | 689 | return best_disk; |
1da177e4 LT |
690 | } |
691 | ||
6b740b8d N |
692 | static int raid1_mergeable_bvec(struct request_queue *q, |
693 | struct bvec_merge_data *bvm, | |
694 | struct bio_vec *biovec) | |
695 | { | |
696 | struct mddev *mddev = q->queuedata; | |
697 | struct r1conf *conf = mddev->private; | |
698 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); | |
699 | int max = biovec->bv_len; | |
700 | ||
701 | if (mddev->merge_check_needed) { | |
702 | int disk; | |
703 | rcu_read_lock(); | |
704 | for (disk = 0; disk < conf->raid_disks * 2; disk++) { | |
705 | struct md_rdev *rdev = rcu_dereference( | |
706 | conf->mirrors[disk].rdev); | |
707 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
708 | struct request_queue *q = | |
709 | bdev_get_queue(rdev->bdev); | |
710 | if (q->merge_bvec_fn) { | |
711 | bvm->bi_sector = sector + | |
712 | rdev->data_offset; | |
713 | bvm->bi_bdev = rdev->bdev; | |
714 | max = min(max, q->merge_bvec_fn( | |
715 | q, bvm, biovec)); | |
716 | } | |
717 | } | |
718 | } | |
719 | rcu_read_unlock(); | |
720 | } | |
721 | return max; | |
722 | ||
723 | } | |
724 | ||
fd01b88c | 725 | int md_raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 726 | { |
e8096360 | 727 | struct r1conf *conf = mddev->private; |
0d129228 N |
728 | int i, ret = 0; |
729 | ||
34db0cd6 N |
730 | if ((bits & (1 << BDI_async_congested)) && |
731 | conf->pending_count >= max_queued_requests) | |
732 | return 1; | |
733 | ||
0d129228 | 734 | rcu_read_lock(); |
f53e29fc | 735 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 736 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 737 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 738 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 739 | |
1ed7242e JB |
740 | BUG_ON(!q); |
741 | ||
0d129228 N |
742 | /* Note the '|| 1' - when read_balance prefers |
743 | * non-congested targets, it can be removed | |
744 | */ | |
91a9e99d | 745 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
746 | ret |= bdi_congested(&q->backing_dev_info, bits); |
747 | else | |
748 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
749 | } | |
750 | } | |
751 | rcu_read_unlock(); | |
752 | return ret; | |
753 | } | |
1ed7242e | 754 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 755 | |
1ed7242e JB |
756 | static int raid1_congested(void *data, int bits) |
757 | { | |
fd01b88c | 758 | struct mddev *mddev = data; |
1ed7242e JB |
759 | |
760 | return mddev_congested(mddev, bits) || | |
761 | md_raid1_congested(mddev, bits); | |
762 | } | |
0d129228 | 763 | |
e8096360 | 764 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
765 | { |
766 | /* Any writes that have been queued but are awaiting | |
767 | * bitmap updates get flushed here. | |
a35e63ef | 768 | */ |
a35e63ef N |
769 | spin_lock_irq(&conf->device_lock); |
770 | ||
771 | if (conf->pending_bio_list.head) { | |
772 | struct bio *bio; | |
773 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 774 | conf->pending_count = 0; |
a35e63ef N |
775 | spin_unlock_irq(&conf->device_lock); |
776 | /* flush any pending bitmap writes to | |
777 | * disk before proceeding w/ I/O */ | |
778 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 779 | wake_up(&conf->wait_barrier); |
a35e63ef N |
780 | |
781 | while (bio) { /* submit pending writes */ | |
782 | struct bio *next = bio->bi_next; | |
783 | bio->bi_next = NULL; | |
2ff8cc2c SL |
784 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
785 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
786 | /* Just ignore it */ | |
787 | bio_endio(bio, 0); | |
788 | else | |
789 | generic_make_request(bio); | |
a35e63ef N |
790 | bio = next; |
791 | } | |
a35e63ef N |
792 | } else |
793 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
794 | } |
795 | ||
17999be4 N |
796 | /* Barriers.... |
797 | * Sometimes we need to suspend IO while we do something else, | |
798 | * either some resync/recovery, or reconfigure the array. | |
799 | * To do this we raise a 'barrier'. | |
800 | * The 'barrier' is a counter that can be raised multiple times | |
801 | * to count how many activities are happening which preclude | |
802 | * normal IO. | |
803 | * We can only raise the barrier if there is no pending IO. | |
804 | * i.e. if nr_pending == 0. | |
805 | * We choose only to raise the barrier if no-one is waiting for the | |
806 | * barrier to go down. This means that as soon as an IO request | |
807 | * is ready, no other operations which require a barrier will start | |
808 | * until the IO request has had a chance. | |
809 | * | |
810 | * So: regular IO calls 'wait_barrier'. When that returns there | |
811 | * is no backgroup IO happening, It must arrange to call | |
812 | * allow_barrier when it has finished its IO. | |
813 | * backgroup IO calls must call raise_barrier. Once that returns | |
814 | * there is no normal IO happeing. It must arrange to call | |
815 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
816 | */ |
817 | #define RESYNC_DEPTH 32 | |
818 | ||
e8096360 | 819 | static void raise_barrier(struct r1conf *conf) |
1da177e4 LT |
820 | { |
821 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
822 | |
823 | /* Wait until no block IO is waiting */ | |
824 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
eed8c02e | 825 | conf->resync_lock); |
17999be4 N |
826 | |
827 | /* block any new IO from starting */ | |
828 | conf->barrier++; | |
829 | ||
046abeed | 830 | /* Now wait for all pending IO to complete */ |
17999be4 N |
831 | wait_event_lock_irq(conf->wait_barrier, |
832 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
eed8c02e | 833 | conf->resync_lock); |
17999be4 N |
834 | |
835 | spin_unlock_irq(&conf->resync_lock); | |
836 | } | |
837 | ||
e8096360 | 838 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
839 | { |
840 | unsigned long flags; | |
709ae487 | 841 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
842 | spin_lock_irqsave(&conf->resync_lock, flags); |
843 | conf->barrier--; | |
844 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
845 | wake_up(&conf->wait_barrier); | |
846 | } | |
847 | ||
e8096360 | 848 | static void wait_barrier(struct r1conf *conf) |
17999be4 N |
849 | { |
850 | spin_lock_irq(&conf->resync_lock); | |
851 | if (conf->barrier) { | |
852 | conf->nr_waiting++; | |
d6b42dcb N |
853 | /* Wait for the barrier to drop. |
854 | * However if there are already pending | |
855 | * requests (preventing the barrier from | |
856 | * rising completely), and the | |
857 | * pre-process bio queue isn't empty, | |
858 | * then don't wait, as we need to empty | |
859 | * that queue to get the nr_pending | |
860 | * count down. | |
861 | */ | |
862 | wait_event_lock_irq(conf->wait_barrier, | |
863 | !conf->barrier || | |
864 | (conf->nr_pending && | |
865 | current->bio_list && | |
866 | !bio_list_empty(current->bio_list)), | |
eed8c02e | 867 | conf->resync_lock); |
17999be4 | 868 | conf->nr_waiting--; |
1da177e4 | 869 | } |
17999be4 | 870 | conf->nr_pending++; |
1da177e4 LT |
871 | spin_unlock_irq(&conf->resync_lock); |
872 | } | |
873 | ||
e8096360 | 874 | static void allow_barrier(struct r1conf *conf) |
17999be4 N |
875 | { |
876 | unsigned long flags; | |
877 | spin_lock_irqsave(&conf->resync_lock, flags); | |
878 | conf->nr_pending--; | |
879 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
880 | wake_up(&conf->wait_barrier); | |
881 | } | |
882 | ||
e2d59925 | 883 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab N |
884 | { |
885 | /* stop syncio and normal IO and wait for everything to | |
886 | * go quite. | |
887 | * We increment barrier and nr_waiting, and then | |
e2d59925 | 888 | * wait until nr_pending match nr_queued+extra |
1c830532 N |
889 | * This is called in the context of one normal IO request |
890 | * that has failed. Thus any sync request that might be pending | |
891 | * will be blocked by nr_pending, and we need to wait for | |
892 | * pending IO requests to complete or be queued for re-try. | |
e2d59925 | 893 | * Thus the number queued (nr_queued) plus this request (extra) |
1c830532 N |
894 | * must match the number of pending IOs (nr_pending) before |
895 | * we continue. | |
ddaf22ab N |
896 | */ |
897 | spin_lock_irq(&conf->resync_lock); | |
898 | conf->barrier++; | |
899 | conf->nr_waiting++; | |
eed8c02e | 900 | wait_event_lock_irq_cmd(conf->wait_barrier, |
e2d59925 | 901 | conf->nr_pending == conf->nr_queued+extra, |
eed8c02e LC |
902 | conf->resync_lock, |
903 | flush_pending_writes(conf)); | |
ddaf22ab N |
904 | spin_unlock_irq(&conf->resync_lock); |
905 | } | |
e8096360 | 906 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
907 | { |
908 | /* reverse the effect of the freeze */ | |
909 | spin_lock_irq(&conf->resync_lock); | |
910 | conf->barrier--; | |
911 | conf->nr_waiting--; | |
912 | wake_up(&conf->wait_barrier); | |
913 | spin_unlock_irq(&conf->resync_lock); | |
914 | } | |
915 | ||
17999be4 | 916 | |
4e78064f | 917 | /* duplicate the data pages for behind I/O |
4e78064f | 918 | */ |
9f2c9d12 | 919 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
920 | { |
921 | int i; | |
922 | struct bio_vec *bvec; | |
2ca68f5e | 923 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 924 | GFP_NOIO); |
2ca68f5e | 925 | if (unlikely(!bvecs)) |
af6d7b76 | 926 | return; |
4b6d287f | 927 | |
cb34e057 | 928 | bio_for_each_segment_all(bvec, bio, i) { |
2ca68f5e N |
929 | bvecs[i] = *bvec; |
930 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
931 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 932 | goto do_sync_io; |
2ca68f5e N |
933 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
934 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
935 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
936 | kunmap(bvec->bv_page); |
937 | } | |
2ca68f5e | 938 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
939 | r1_bio->behind_page_count = bio->bi_vcnt; |
940 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
941 | return; | |
4b6d287f N |
942 | |
943 | do_sync_io: | |
af6d7b76 | 944 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
945 | if (bvecs[i].bv_page) |
946 | put_page(bvecs[i].bv_page); | |
947 | kfree(bvecs); | |
36a4e1fe | 948 | pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
949 | } |
950 | ||
f54a9d0e N |
951 | struct raid1_plug_cb { |
952 | struct blk_plug_cb cb; | |
953 | struct bio_list pending; | |
954 | int pending_cnt; | |
955 | }; | |
956 | ||
957 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
958 | { | |
959 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
960 | cb); | |
961 | struct mddev *mddev = plug->cb.data; | |
962 | struct r1conf *conf = mddev->private; | |
963 | struct bio *bio; | |
964 | ||
874807a8 | 965 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
966 | spin_lock_irq(&conf->device_lock); |
967 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
968 | conf->pending_count += plug->pending_cnt; | |
969 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 970 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
971 | md_wakeup_thread(mddev->thread); |
972 | kfree(plug); | |
973 | return; | |
974 | } | |
975 | ||
976 | /* we aren't scheduling, so we can do the write-out directly. */ | |
977 | bio = bio_list_get(&plug->pending); | |
978 | bitmap_unplug(mddev->bitmap); | |
979 | wake_up(&conf->wait_barrier); | |
980 | ||
981 | while (bio) { /* submit pending writes */ | |
982 | struct bio *next = bio->bi_next; | |
983 | bio->bi_next = NULL; | |
32f9f570 SL |
984 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
985 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
986 | /* Just ignore it */ | |
987 | bio_endio(bio, 0); | |
988 | else | |
989 | generic_make_request(bio); | |
f54a9d0e N |
990 | bio = next; |
991 | } | |
992 | kfree(plug); | |
993 | } | |
994 | ||
b4fdcb02 | 995 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 996 | { |
e8096360 | 997 | struct r1conf *conf = mddev->private; |
0eaf822c | 998 | struct raid1_info *mirror; |
9f2c9d12 | 999 | struct r1bio *r1_bio; |
1da177e4 | 1000 | struct bio *read_bio; |
1f68f0c4 | 1001 | int i, disks; |
84255d10 | 1002 | struct bitmap *bitmap; |
191ea9b2 | 1003 | unsigned long flags; |
a362357b | 1004 | const int rw = bio_data_dir(bio); |
2c7d46ec | 1005 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 1006 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
2ff8cc2c SL |
1007 | const unsigned long do_discard = (bio->bi_rw |
1008 | & (REQ_DISCARD | REQ_SECURE)); | |
c8dc9c65 | 1009 | const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME); |
3cb03002 | 1010 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1011 | struct blk_plug_cb *cb; |
1012 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 N |
1013 | int first_clone; |
1014 | int sectors_handled; | |
1015 | int max_sectors; | |
191ea9b2 | 1016 | |
1da177e4 LT |
1017 | /* |
1018 | * Register the new request and wait if the reconstruction | |
1019 | * thread has put up a bar for new requests. | |
1020 | * Continue immediately if no resync is active currently. | |
1021 | */ | |
62de608d | 1022 | |
3d310eb7 N |
1023 | md_write_start(mddev, bio); /* wait on superblock update early */ |
1024 | ||
6eef4b21 | 1025 | if (bio_data_dir(bio) == WRITE && |
f73a1c7d | 1026 | bio_end_sector(bio) > mddev->suspend_lo && |
6eef4b21 N |
1027 | bio->bi_sector < mddev->suspend_hi) { |
1028 | /* As the suspend_* range is controlled by | |
1029 | * userspace, we want an interruptible | |
1030 | * wait. | |
1031 | */ | |
1032 | DEFINE_WAIT(w); | |
1033 | for (;;) { | |
1034 | flush_signals(current); | |
1035 | prepare_to_wait(&conf->wait_barrier, | |
1036 | &w, TASK_INTERRUPTIBLE); | |
f73a1c7d | 1037 | if (bio_end_sector(bio) <= mddev->suspend_lo || |
6eef4b21 N |
1038 | bio->bi_sector >= mddev->suspend_hi) |
1039 | break; | |
1040 | schedule(); | |
1041 | } | |
1042 | finish_wait(&conf->wait_barrier, &w); | |
1043 | } | |
62de608d | 1044 | |
17999be4 | 1045 | wait_barrier(conf); |
1da177e4 | 1046 | |
84255d10 N |
1047 | bitmap = mddev->bitmap; |
1048 | ||
1da177e4 LT |
1049 | /* |
1050 | * make_request() can abort the operation when READA is being | |
1051 | * used and no empty request is available. | |
1052 | * | |
1053 | */ | |
1054 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1055 | ||
1056 | r1_bio->master_bio = bio; | |
aa8b57aa | 1057 | r1_bio->sectors = bio_sectors(bio); |
191ea9b2 | 1058 | r1_bio->state = 0; |
1da177e4 LT |
1059 | r1_bio->mddev = mddev; |
1060 | r1_bio->sector = bio->bi_sector; | |
1061 | ||
d2eb35ac N |
1062 | /* We might need to issue multiple reads to different |
1063 | * devices if there are bad blocks around, so we keep | |
1064 | * track of the number of reads in bio->bi_phys_segments. | |
1065 | * If this is 0, there is only one r1_bio and no locking | |
1066 | * will be needed when requests complete. If it is | |
1067 | * non-zero, then it is the number of not-completed requests. | |
1068 | */ | |
1069 | bio->bi_phys_segments = 0; | |
1070 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
1071 | ||
a362357b | 1072 | if (rw == READ) { |
1da177e4 LT |
1073 | /* |
1074 | * read balancing logic: | |
1075 | */ | |
d2eb35ac N |
1076 | int rdisk; |
1077 | ||
1078 | read_again: | |
1079 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
1080 | |
1081 | if (rdisk < 0) { | |
1082 | /* couldn't find anywhere to read from */ | |
1083 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 1084 | return; |
1da177e4 LT |
1085 | } |
1086 | mirror = conf->mirrors + rdisk; | |
1087 | ||
e555190d N |
1088 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1089 | bitmap) { | |
1090 | /* Reading from a write-mostly device must | |
1091 | * take care not to over-take any writes | |
1092 | * that are 'behind' | |
1093 | */ | |
1094 | wait_event(bitmap->behind_wait, | |
1095 | atomic_read(&bitmap->behind_writes) == 0); | |
1096 | } | |
1da177e4 LT |
1097 | r1_bio->read_disk = rdisk; |
1098 | ||
a167f663 | 1099 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
1100 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
1101 | max_sectors); | |
1da177e4 LT |
1102 | |
1103 | r1_bio->bios[rdisk] = read_bio; | |
1104 | ||
1105 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
1106 | read_bio->bi_bdev = mirror->rdev->bdev; | |
1107 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1108 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1109 | read_bio->bi_private = r1_bio; |
1110 | ||
d2eb35ac N |
1111 | if (max_sectors < r1_bio->sectors) { |
1112 | /* could not read all from this device, so we will | |
1113 | * need another r1_bio. | |
1114 | */ | |
d2eb35ac N |
1115 | |
1116 | sectors_handled = (r1_bio->sector + max_sectors | |
1117 | - bio->bi_sector); | |
1118 | r1_bio->sectors = max_sectors; | |
1119 | spin_lock_irq(&conf->device_lock); | |
1120 | if (bio->bi_phys_segments == 0) | |
1121 | bio->bi_phys_segments = 2; | |
1122 | else | |
1123 | bio->bi_phys_segments++; | |
1124 | spin_unlock_irq(&conf->device_lock); | |
1125 | /* Cannot call generic_make_request directly | |
1126 | * as that will be queued in __make_request | |
1127 | * and subsequent mempool_alloc might block waiting | |
1128 | * for it. So hand bio over to raid1d. | |
1129 | */ | |
1130 | reschedule_retry(r1_bio); | |
1131 | ||
1132 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1133 | ||
1134 | r1_bio->master_bio = bio; | |
aa8b57aa | 1135 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
d2eb35ac N |
1136 | r1_bio->state = 0; |
1137 | r1_bio->mddev = mddev; | |
1138 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1139 | goto read_again; | |
1140 | } else | |
1141 | generic_make_request(read_bio); | |
5a7bbad2 | 1142 | return; |
1da177e4 LT |
1143 | } |
1144 | ||
1145 | /* | |
1146 | * WRITE: | |
1147 | */ | |
34db0cd6 N |
1148 | if (conf->pending_count >= max_queued_requests) { |
1149 | md_wakeup_thread(mddev->thread); | |
1150 | wait_event(conf->wait_barrier, | |
1151 | conf->pending_count < max_queued_requests); | |
1152 | } | |
1f68f0c4 | 1153 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1154 | * inc refcount on their rdev. Record them by setting |
1155 | * bios[x] to bio | |
1f68f0c4 N |
1156 | * If there are known/acknowledged bad blocks on any device on |
1157 | * which we have seen a write error, we want to avoid writing those | |
1158 | * blocks. | |
1159 | * This potentially requires several writes to write around | |
1160 | * the bad blocks. Each set of writes gets it's own r1bio | |
1161 | * with a set of bios attached. | |
1da177e4 | 1162 | */ |
c3b328ac | 1163 | |
8f19ccb2 | 1164 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1165 | retry_write: |
1166 | blocked_rdev = NULL; | |
1da177e4 | 1167 | rcu_read_lock(); |
1f68f0c4 | 1168 | max_sectors = r1_bio->sectors; |
1da177e4 | 1169 | for (i = 0; i < disks; i++) { |
3cb03002 | 1170 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1171 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1172 | atomic_inc(&rdev->nr_pending); | |
1173 | blocked_rdev = rdev; | |
1174 | break; | |
1175 | } | |
1f68f0c4 | 1176 | r1_bio->bios[i] = NULL; |
6b740b8d N |
1177 | if (!rdev || test_bit(Faulty, &rdev->flags) |
1178 | || test_bit(Unmerged, &rdev->flags)) { | |
8f19ccb2 N |
1179 | if (i < conf->raid_disks) |
1180 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1181 | continue; |
1182 | } | |
1183 | ||
1184 | atomic_inc(&rdev->nr_pending); | |
1185 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1186 | sector_t first_bad; | |
1187 | int bad_sectors; | |
1188 | int is_bad; | |
1189 | ||
1190 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1191 | max_sectors, | |
1192 | &first_bad, &bad_sectors); | |
1193 | if (is_bad < 0) { | |
1194 | /* mustn't write here until the bad block is | |
1195 | * acknowledged*/ | |
1196 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1197 | blocked_rdev = rdev; | |
1198 | break; | |
1199 | } | |
1200 | if (is_bad && first_bad <= r1_bio->sector) { | |
1201 | /* Cannot write here at all */ | |
1202 | bad_sectors -= (r1_bio->sector - first_bad); | |
1203 | if (bad_sectors < max_sectors) | |
1204 | /* mustn't write more than bad_sectors | |
1205 | * to other devices yet | |
1206 | */ | |
1207 | max_sectors = bad_sectors; | |
03c902e1 | 1208 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1209 | /* We don't set R1BIO_Degraded as that |
1210 | * only applies if the disk is | |
1211 | * missing, so it might be re-added, | |
1212 | * and we want to know to recover this | |
1213 | * chunk. | |
1214 | * In this case the device is here, | |
1215 | * and the fact that this chunk is not | |
1216 | * in-sync is recorded in the bad | |
1217 | * block log | |
1218 | */ | |
1219 | continue; | |
964147d5 | 1220 | } |
1f68f0c4 N |
1221 | if (is_bad) { |
1222 | int good_sectors = first_bad - r1_bio->sector; | |
1223 | if (good_sectors < max_sectors) | |
1224 | max_sectors = good_sectors; | |
1225 | } | |
1226 | } | |
1227 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1228 | } |
1229 | rcu_read_unlock(); | |
1230 | ||
6bfe0b49 DW |
1231 | if (unlikely(blocked_rdev)) { |
1232 | /* Wait for this device to become unblocked */ | |
1233 | int j; | |
1234 | ||
1235 | for (j = 0; j < i; j++) | |
1236 | if (r1_bio->bios[j]) | |
1237 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1238 | r1_bio->state = 0; |
6bfe0b49 DW |
1239 | allow_barrier(conf); |
1240 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1241 | wait_barrier(conf); | |
1242 | goto retry_write; | |
1243 | } | |
1244 | ||
1f68f0c4 N |
1245 | if (max_sectors < r1_bio->sectors) { |
1246 | /* We are splitting this write into multiple parts, so | |
1247 | * we need to prepare for allocating another r1_bio. | |
1248 | */ | |
1249 | r1_bio->sectors = max_sectors; | |
1250 | spin_lock_irq(&conf->device_lock); | |
1251 | if (bio->bi_phys_segments == 0) | |
1252 | bio->bi_phys_segments = 2; | |
1253 | else | |
1254 | bio->bi_phys_segments++; | |
1255 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1256 | } |
1f68f0c4 | 1257 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1258 | |
4e78064f | 1259 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1260 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1261 | |
1f68f0c4 | 1262 | first_clone = 1; |
1da177e4 LT |
1263 | for (i = 0; i < disks; i++) { |
1264 | struct bio *mbio; | |
1265 | if (!r1_bio->bios[i]) | |
1266 | continue; | |
1267 | ||
a167f663 | 1268 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1269 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1270 | ||
1271 | if (first_clone) { | |
1272 | /* do behind I/O ? | |
1273 | * Not if there are too many, or cannot | |
1274 | * allocate memory, or a reader on WriteMostly | |
1275 | * is waiting for behind writes to flush */ | |
1276 | if (bitmap && | |
1277 | (atomic_read(&bitmap->behind_writes) | |
1278 | < mddev->bitmap_info.max_write_behind) && | |
1279 | !waitqueue_active(&bitmap->behind_wait)) | |
1280 | alloc_behind_pages(mbio, r1_bio); | |
1281 | ||
1282 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1283 | r1_bio->sectors, | |
1284 | test_bit(R1BIO_BehindIO, | |
1285 | &r1_bio->state)); | |
1286 | first_clone = 0; | |
1287 | } | |
2ca68f5e | 1288 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1289 | struct bio_vec *bvec; |
1290 | int j; | |
1291 | ||
cb34e057 KO |
1292 | /* |
1293 | * We trimmed the bio, so _all is legit | |
4b6d287f | 1294 | */ |
d74c6d51 | 1295 | bio_for_each_segment_all(bvec, mbio, j) |
2ca68f5e | 1296 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1297 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1298 | atomic_inc(&r1_bio->behind_remaining); | |
1299 | } | |
1300 | ||
1f68f0c4 N |
1301 | r1_bio->bios[i] = mbio; |
1302 | ||
1303 | mbio->bi_sector = (r1_bio->sector + | |
1304 | conf->mirrors[i].rdev->data_offset); | |
1305 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1306 | mbio->bi_end_io = raid1_end_write_request; | |
c8dc9c65 JL |
1307 | mbio->bi_rw = |
1308 | WRITE | do_flush_fua | do_sync | do_discard | do_same; | |
1f68f0c4 N |
1309 | mbio->bi_private = r1_bio; |
1310 | ||
1da177e4 | 1311 | atomic_inc(&r1_bio->remaining); |
f54a9d0e N |
1312 | |
1313 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); | |
1314 | if (cb) | |
1315 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1316 | else | |
1317 | plug = NULL; | |
4e78064f | 1318 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1319 | if (plug) { |
1320 | bio_list_add(&plug->pending, mbio); | |
1321 | plug->pending_cnt++; | |
1322 | } else { | |
1323 | bio_list_add(&conf->pending_bio_list, mbio); | |
1324 | conf->pending_count++; | |
1325 | } | |
4e78064f | 1326 | spin_unlock_irqrestore(&conf->device_lock, flags); |
f54a9d0e | 1327 | if (!plug) |
b357f04a | 1328 | md_wakeup_thread(mddev->thread); |
1da177e4 | 1329 | } |
079fa166 N |
1330 | /* Mustn't call r1_bio_write_done before this next test, |
1331 | * as it could result in the bio being freed. | |
1332 | */ | |
aa8b57aa | 1333 | if (sectors_handled < bio_sectors(bio)) { |
079fa166 | 1334 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1335 | /* We need another r1_bio. It has already been counted |
1336 | * in bio->bi_phys_segments | |
1337 | */ | |
1338 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1339 | r1_bio->master_bio = bio; | |
aa8b57aa | 1340 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
1f68f0c4 N |
1341 | r1_bio->state = 0; |
1342 | r1_bio->mddev = mddev; | |
1343 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1344 | goto retry_write; | |
1345 | } | |
1346 | ||
079fa166 N |
1347 | r1_bio_write_done(r1_bio); |
1348 | ||
1349 | /* In case raid1d snuck in to freeze_array */ | |
1350 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1351 | } |
1352 | ||
fd01b88c | 1353 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1354 | { |
e8096360 | 1355 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1356 | int i; |
1357 | ||
1358 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1359 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1360 | rcu_read_lock(); |
1361 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1362 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1363 | seq_printf(seq, "%s", |
ddac7c7e N |
1364 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1365 | } | |
1366 | rcu_read_unlock(); | |
1da177e4 LT |
1367 | seq_printf(seq, "]"); |
1368 | } | |
1369 | ||
1370 | ||
fd01b88c | 1371 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1372 | { |
1373 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1374 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1375 | |
1376 | /* | |
1377 | * If it is not operational, then we have already marked it as dead | |
1378 | * else if it is the last working disks, ignore the error, let the | |
1379 | * next level up know. | |
1380 | * else mark the drive as failed | |
1381 | */ | |
b2d444d7 | 1382 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1383 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1384 | /* |
1385 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1386 | * normal single drive. |
1387 | * However don't try a recovery from this drive as | |
1388 | * it is very likely to fail. | |
1da177e4 | 1389 | */ |
5389042f | 1390 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1391 | return; |
4044ba58 | 1392 | } |
de393cde | 1393 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1394 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1395 | unsigned long flags; | |
1396 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1397 | mddev->degraded++; |
dd00a99e | 1398 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1399 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1400 | /* |
1401 | * if recovery is running, make sure it aborts. | |
1402 | */ | |
dfc70645 | 1403 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1404 | } else |
1405 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1406 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1407 | printk(KERN_ALERT |
1408 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1409 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1410 | mdname(mddev), bdevname(rdev->bdev, b), |
1411 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1412 | } |
1413 | ||
e8096360 | 1414 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1415 | { |
1416 | int i; | |
1da177e4 | 1417 | |
9dd1e2fa | 1418 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1419 | if (!conf) { |
9dd1e2fa | 1420 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1421 | return; |
1422 | } | |
9dd1e2fa | 1423 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1424 | conf->raid_disks); |
1425 | ||
ddac7c7e | 1426 | rcu_read_lock(); |
1da177e4 LT |
1427 | for (i = 0; i < conf->raid_disks; i++) { |
1428 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1429 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1430 | if (rdev) |
9dd1e2fa | 1431 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1432 | i, !test_bit(In_sync, &rdev->flags), |
1433 | !test_bit(Faulty, &rdev->flags), | |
1434 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1435 | } |
ddac7c7e | 1436 | rcu_read_unlock(); |
1da177e4 LT |
1437 | } |
1438 | ||
e8096360 | 1439 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1440 | { |
17999be4 N |
1441 | wait_barrier(conf); |
1442 | allow_barrier(conf); | |
1da177e4 LT |
1443 | |
1444 | mempool_destroy(conf->r1buf_pool); | |
1445 | conf->r1buf_pool = NULL; | |
1446 | } | |
1447 | ||
fd01b88c | 1448 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1449 | { |
1450 | int i; | |
e8096360 | 1451 | struct r1conf *conf = mddev->private; |
6b965620 N |
1452 | int count = 0; |
1453 | unsigned long flags; | |
1da177e4 LT |
1454 | |
1455 | /* | |
1456 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1457 | * and mark them readable. |
1458 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1459 | */ |
1460 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1461 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1462 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1463 | if (repl | |
1464 | && repl->recovery_offset == MaxSector | |
1465 | && !test_bit(Faulty, &repl->flags) | |
1466 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1467 | /* replacement has just become active */ | |
1468 | if (!rdev || | |
1469 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1470 | count++; | |
1471 | if (rdev) { | |
1472 | /* Replaced device not technically | |
1473 | * faulty, but we need to be sure | |
1474 | * it gets removed and never re-added | |
1475 | */ | |
1476 | set_bit(Faulty, &rdev->flags); | |
1477 | sysfs_notify_dirent_safe( | |
1478 | rdev->sysfs_state); | |
1479 | } | |
1480 | } | |
ddac7c7e N |
1481 | if (rdev |
1482 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1483 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1484 | count++; |
654e8b5a | 1485 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1486 | } |
1487 | } | |
6b965620 N |
1488 | spin_lock_irqsave(&conf->device_lock, flags); |
1489 | mddev->degraded -= count; | |
1490 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1491 | |
1492 | print_conf(conf); | |
6b965620 | 1493 | return count; |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | ||
fd01b88c | 1497 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1498 | { |
e8096360 | 1499 | struct r1conf *conf = mddev->private; |
199050ea | 1500 | int err = -EEXIST; |
41158c7e | 1501 | int mirror = 0; |
0eaf822c | 1502 | struct raid1_info *p; |
6c2fce2e | 1503 | int first = 0; |
30194636 | 1504 | int last = conf->raid_disks - 1; |
6b740b8d | 1505 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
1da177e4 | 1506 | |
5389042f N |
1507 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1508 | return -EBUSY; | |
1509 | ||
6c2fce2e NB |
1510 | if (rdev->raid_disk >= 0) |
1511 | first = last = rdev->raid_disk; | |
1512 | ||
6b740b8d N |
1513 | if (q->merge_bvec_fn) { |
1514 | set_bit(Unmerged, &rdev->flags); | |
1515 | mddev->merge_check_needed = 1; | |
1516 | } | |
1517 | ||
7ef449d1 N |
1518 | for (mirror = first; mirror <= last; mirror++) { |
1519 | p = conf->mirrors+mirror; | |
1520 | if (!p->rdev) { | |
1da177e4 | 1521 | |
9092c02d JB |
1522 | if (mddev->gendisk) |
1523 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1524 | rdev->data_offset << 9); | |
1da177e4 LT |
1525 | |
1526 | p->head_position = 0; | |
1527 | rdev->raid_disk = mirror; | |
199050ea | 1528 | err = 0; |
6aea114a N |
1529 | /* As all devices are equivalent, we don't need a full recovery |
1530 | * if this was recently any drive of the array | |
1531 | */ | |
1532 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1533 | conf->fullsync = 1; |
d6065f7b | 1534 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1535 | break; |
1536 | } | |
7ef449d1 N |
1537 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1538 | p[conf->raid_disks].rdev == NULL) { | |
1539 | /* Add this device as a replacement */ | |
1540 | clear_bit(In_sync, &rdev->flags); | |
1541 | set_bit(Replacement, &rdev->flags); | |
1542 | rdev->raid_disk = mirror; | |
1543 | err = 0; | |
1544 | conf->fullsync = 1; | |
1545 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1546 | break; | |
1547 | } | |
1548 | } | |
6b740b8d N |
1549 | if (err == 0 && test_bit(Unmerged, &rdev->flags)) { |
1550 | /* Some requests might not have seen this new | |
1551 | * merge_bvec_fn. We must wait for them to complete | |
1552 | * before merging the device fully. | |
1553 | * First we make sure any code which has tested | |
1554 | * our function has submitted the request, then | |
1555 | * we wait for all outstanding requests to complete. | |
1556 | */ | |
1557 | synchronize_sched(); | |
e2d59925 N |
1558 | freeze_array(conf, 0); |
1559 | unfreeze_array(conf); | |
6b740b8d N |
1560 | clear_bit(Unmerged, &rdev->flags); |
1561 | } | |
ac5e7113 | 1562 | md_integrity_add_rdev(rdev, mddev); |
9092c02d | 1563 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2ff8cc2c | 1564 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1565 | print_conf(conf); |
199050ea | 1566 | return err; |
1da177e4 LT |
1567 | } |
1568 | ||
b8321b68 | 1569 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1570 | { |
e8096360 | 1571 | struct r1conf *conf = mddev->private; |
1da177e4 | 1572 | int err = 0; |
b8321b68 | 1573 | int number = rdev->raid_disk; |
0eaf822c | 1574 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1575 | |
b014f14c N |
1576 | if (rdev != p->rdev) |
1577 | p = conf->mirrors + conf->raid_disks + number; | |
1578 | ||
1da177e4 | 1579 | print_conf(conf); |
b8321b68 | 1580 | if (rdev == p->rdev) { |
b2d444d7 | 1581 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1582 | atomic_read(&rdev->nr_pending)) { |
1583 | err = -EBUSY; | |
1584 | goto abort; | |
1585 | } | |
046abeed | 1586 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1587 | * is not possible. |
1588 | */ | |
1589 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1590 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1591 | mddev->degraded < conf->raid_disks) { |
1592 | err = -EBUSY; | |
1593 | goto abort; | |
1594 | } | |
1da177e4 | 1595 | p->rdev = NULL; |
fbd568a3 | 1596 | synchronize_rcu(); |
1da177e4 LT |
1597 | if (atomic_read(&rdev->nr_pending)) { |
1598 | /* lost the race, try later */ | |
1599 | err = -EBUSY; | |
1600 | p->rdev = rdev; | |
ac5e7113 | 1601 | goto abort; |
8c7a2c2b N |
1602 | } else if (conf->mirrors[conf->raid_disks + number].rdev) { |
1603 | /* We just removed a device that is being replaced. | |
1604 | * Move down the replacement. We drain all IO before | |
1605 | * doing this to avoid confusion. | |
1606 | */ | |
1607 | struct md_rdev *repl = | |
1608 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1609 | freeze_array(conf, 0); |
8c7a2c2b N |
1610 | clear_bit(Replacement, &repl->flags); |
1611 | p->rdev = repl; | |
1612 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1613 | unfreeze_array(conf); |
8c7a2c2b N |
1614 | clear_bit(WantReplacement, &rdev->flags); |
1615 | } else | |
b014f14c | 1616 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1617 | err = md_integrity_register(mddev); |
1da177e4 LT |
1618 | } |
1619 | abort: | |
1620 | ||
1621 | print_conf(conf); | |
1622 | return err; | |
1623 | } | |
1624 | ||
1625 | ||
6712ecf8 | 1626 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1627 | { |
9f2c9d12 | 1628 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1629 | |
0fc280f6 | 1630 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1631 | |
1da177e4 LT |
1632 | /* |
1633 | * we have read a block, now it needs to be re-written, | |
1634 | * or re-read if the read failed. | |
1635 | * We don't do much here, just schedule handling by raid1d | |
1636 | */ | |
69382e85 | 1637 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1638 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1639 | |
1640 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1641 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1642 | } |
1643 | ||
6712ecf8 | 1644 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1645 | { |
1646 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1647 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1648 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1649 | struct r1conf *conf = mddev->private; |
1da177e4 | 1650 | int mirror=0; |
4367af55 N |
1651 | sector_t first_bad; |
1652 | int bad_sectors; | |
1da177e4 | 1653 | |
ba3ae3be NK |
1654 | mirror = find_bio_disk(r1_bio, bio); |
1655 | ||
6b1117d5 | 1656 | if (!uptodate) { |
57dab0bd | 1657 | sector_t sync_blocks = 0; |
6b1117d5 N |
1658 | sector_t s = r1_bio->sector; |
1659 | long sectors_to_go = r1_bio->sectors; | |
1660 | /* make sure these bits doesn't get cleared. */ | |
1661 | do { | |
5e3db645 | 1662 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1663 | &sync_blocks, 1); |
1664 | s += sync_blocks; | |
1665 | sectors_to_go -= sync_blocks; | |
1666 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1667 | set_bit(WriteErrorSeen, |
1668 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
1669 | if (!test_and_set_bit(WantReplacement, |
1670 | &conf->mirrors[mirror].rdev->flags)) | |
1671 | set_bit(MD_RECOVERY_NEEDED, & | |
1672 | mddev->recovery); | |
d8f05d29 | 1673 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 N |
1674 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1675 | r1_bio->sector, | |
1676 | r1_bio->sectors, | |
3a9f28a5 N |
1677 | &first_bad, &bad_sectors) && |
1678 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1679 | r1_bio->sector, | |
1680 | r1_bio->sectors, | |
1681 | &first_bad, &bad_sectors) | |
1682 | ) | |
4367af55 | 1683 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1684 | |
1da177e4 | 1685 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1686 | int s = r1_bio->sectors; |
d8f05d29 N |
1687 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1688 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1689 | reschedule_retry(r1_bio); |
1690 | else { | |
1691 | put_buf(r1_bio); | |
1692 | md_done_sync(mddev, s, uptodate); | |
1693 | } | |
1da177e4 | 1694 | } |
1da177e4 LT |
1695 | } |
1696 | ||
3cb03002 | 1697 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1698 | int sectors, struct page *page, int rw) |
1699 | { | |
1700 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1701 | /* success */ | |
1702 | return 1; | |
19d67169 | 1703 | if (rw == WRITE) { |
d8f05d29 | 1704 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1705 | if (!test_and_set_bit(WantReplacement, |
1706 | &rdev->flags)) | |
1707 | set_bit(MD_RECOVERY_NEEDED, & | |
1708 | rdev->mddev->recovery); | |
1709 | } | |
d8f05d29 N |
1710 | /* need to record an error - either for the block or the device */ |
1711 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1712 | md_error(rdev->mddev, rdev); | |
1713 | return 0; | |
1714 | } | |
1715 | ||
9f2c9d12 | 1716 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1717 | { |
a68e5870 N |
1718 | /* Try some synchronous reads of other devices to get |
1719 | * good data, much like with normal read errors. Only | |
1720 | * read into the pages we already have so we don't | |
1721 | * need to re-issue the read request. | |
1722 | * We don't need to freeze the array, because being in an | |
1723 | * active sync request, there is no normal IO, and | |
1724 | * no overlapping syncs. | |
06f60385 N |
1725 | * We don't need to check is_badblock() again as we |
1726 | * made sure that anything with a bad block in range | |
1727 | * will have bi_end_io clear. | |
a68e5870 | 1728 | */ |
fd01b88c | 1729 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1730 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1731 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1732 | sector_t sect = r1_bio->sector; | |
1733 | int sectors = r1_bio->sectors; | |
1734 | int idx = 0; | |
1735 | ||
1736 | while(sectors) { | |
1737 | int s = sectors; | |
1738 | int d = r1_bio->read_disk; | |
1739 | int success = 0; | |
3cb03002 | 1740 | struct md_rdev *rdev; |
78d7f5f7 | 1741 | int start; |
a68e5870 N |
1742 | |
1743 | if (s > (PAGE_SIZE>>9)) | |
1744 | s = PAGE_SIZE >> 9; | |
1745 | do { | |
1746 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1747 | /* No rcu protection needed here devices | |
1748 | * can only be removed when no resync is | |
1749 | * active, and resync is currently active | |
1750 | */ | |
1751 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1752 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1753 | bio->bi_io_vec[idx].bv_page, |
1754 | READ, false)) { | |
1755 | success = 1; | |
1756 | break; | |
1757 | } | |
1758 | } | |
1759 | d++; | |
8f19ccb2 | 1760 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1761 | d = 0; |
1762 | } while (!success && d != r1_bio->read_disk); | |
1763 | ||
78d7f5f7 | 1764 | if (!success) { |
a68e5870 | 1765 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1766 | int abort = 0; |
1767 | /* Cannot read from anywhere, this block is lost. | |
1768 | * Record a bad block on each device. If that doesn't | |
1769 | * work just disable and interrupt the recovery. | |
1770 | * Don't fail devices as that won't really help. | |
1771 | */ | |
a68e5870 N |
1772 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1773 | " for block %llu\n", | |
1774 | mdname(mddev), | |
1775 | bdevname(bio->bi_bdev, b), | |
1776 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 1777 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1778 | rdev = conf->mirrors[d].rdev; |
1779 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1780 | continue; | |
1781 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1782 | abort = 1; | |
1783 | } | |
1784 | if (abort) { | |
d890fa2b N |
1785 | conf->recovery_disabled = |
1786 | mddev->recovery_disabled; | |
3a9f28a5 N |
1787 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1788 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1789 | put_buf(r1_bio); | |
1790 | return 0; | |
1791 | } | |
1792 | /* Try next page */ | |
1793 | sectors -= s; | |
1794 | sect += s; | |
1795 | idx++; | |
1796 | continue; | |
d11c171e | 1797 | } |
78d7f5f7 N |
1798 | |
1799 | start = d; | |
1800 | /* write it back and re-read */ | |
1801 | while (d != r1_bio->read_disk) { | |
1802 | if (d == 0) | |
8f19ccb2 | 1803 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1804 | d--; |
1805 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1806 | continue; | |
1807 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1808 | if (r1_sync_page_io(rdev, sect, s, |
1809 | bio->bi_io_vec[idx].bv_page, | |
1810 | WRITE) == 0) { | |
78d7f5f7 N |
1811 | r1_bio->bios[d]->bi_end_io = NULL; |
1812 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1813 | } |
78d7f5f7 N |
1814 | } |
1815 | d = start; | |
1816 | while (d != r1_bio->read_disk) { | |
1817 | if (d == 0) | |
8f19ccb2 | 1818 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1819 | d--; |
1820 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1821 | continue; | |
1822 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1823 | if (r1_sync_page_io(rdev, sect, s, |
1824 | bio->bi_io_vec[idx].bv_page, | |
1825 | READ) != 0) | |
9d3d8011 | 1826 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1827 | } |
a68e5870 N |
1828 | sectors -= s; |
1829 | sect += s; | |
1830 | idx ++; | |
1831 | } | |
78d7f5f7 | 1832 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1833 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1834 | return 1; |
1835 | } | |
1836 | ||
9f2c9d12 | 1837 | static int process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1838 | { |
1839 | /* We have read all readable devices. If we haven't | |
1840 | * got the block, then there is no hope left. | |
1841 | * If we have, then we want to do a comparison | |
1842 | * and skip the write if everything is the same. | |
1843 | * If any blocks failed to read, then we need to | |
1844 | * attempt an over-write | |
1845 | */ | |
fd01b88c | 1846 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1847 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1848 | int primary; |
1849 | int i; | |
f4380a91 | 1850 | int vcnt; |
a68e5870 | 1851 | |
30bc9b53 N |
1852 | /* Fix variable parts of all bios */ |
1853 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
1854 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
1855 | int j; | |
1856 | int size; | |
1857 | struct bio *b = r1_bio->bios[i]; | |
1858 | if (b->bi_end_io != end_sync_read) | |
1859 | continue; | |
1860 | /* fixup the bio for reuse */ | |
1861 | bio_reset(b); | |
1862 | b->bi_vcnt = vcnt; | |
1863 | b->bi_size = r1_bio->sectors << 9; | |
1864 | b->bi_sector = r1_bio->sector + | |
1865 | conf->mirrors[i].rdev->data_offset; | |
1866 | b->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1867 | b->bi_end_io = end_sync_read; | |
1868 | b->bi_private = r1_bio; | |
1869 | ||
1870 | size = b->bi_size; | |
1871 | for (j = 0; j < vcnt ; j++) { | |
1872 | struct bio_vec *bi; | |
1873 | bi = &b->bi_io_vec[j]; | |
1874 | bi->bv_offset = 0; | |
1875 | if (size > PAGE_SIZE) | |
1876 | bi->bv_len = PAGE_SIZE; | |
1877 | else | |
1878 | bi->bv_len = size; | |
1879 | size -= PAGE_SIZE; | |
1880 | } | |
1881 | } | |
8f19ccb2 | 1882 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 N |
1883 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1884 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1885 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1886 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1887 | break; | |
1888 | } | |
1889 | r1_bio->read_disk = primary; | |
8f19ccb2 | 1890 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 1891 | int j; |
78d7f5f7 N |
1892 | struct bio *pbio = r1_bio->bios[primary]; |
1893 | struct bio *sbio = r1_bio->bios[i]; | |
a68e5870 | 1894 | |
2aabaa65 | 1895 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 N |
1896 | continue; |
1897 | ||
1898 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1899 | for (j = vcnt; j-- ; ) { | |
1900 | struct page *p, *s; | |
1901 | p = pbio->bi_io_vec[j].bv_page; | |
1902 | s = sbio->bi_io_vec[j].bv_page; | |
1903 | if (memcmp(page_address(p), | |
1904 | page_address(s), | |
5020ad7d | 1905 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 1906 | break; |
69382e85 | 1907 | } |
78d7f5f7 N |
1908 | } else |
1909 | j = 0; | |
1910 | if (j >= 0) | |
7f7583d4 | 1911 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 N |
1912 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1913 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1914 | /* No need to write to this device. */ | |
1915 | sbio->bi_end_io = NULL; | |
1916 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1917 | continue; | |
1918 | } | |
d3b45c2a KO |
1919 | |
1920 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 1921 | } |
a68e5870 N |
1922 | return 0; |
1923 | } | |
1924 | ||
9f2c9d12 | 1925 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 1926 | { |
e8096360 | 1927 | struct r1conf *conf = mddev->private; |
a68e5870 | 1928 | int i; |
8f19ccb2 | 1929 | int disks = conf->raid_disks * 2; |
a68e5870 N |
1930 | struct bio *bio, *wbio; |
1931 | ||
1932 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1933 | ||
a68e5870 N |
1934 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1935 | /* ouch - failed to read all of that. */ | |
1936 | if (!fix_sync_read_error(r1_bio)) | |
1937 | return; | |
7ca78d57 N |
1938 | |
1939 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1940 | if (process_checks(r1_bio) < 0) | |
1941 | return; | |
d11c171e N |
1942 | /* |
1943 | * schedule writes | |
1944 | */ | |
1da177e4 LT |
1945 | atomic_set(&r1_bio->remaining, 1); |
1946 | for (i = 0; i < disks ; i++) { | |
1947 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1948 | if (wbio->bi_end_io == NULL || |
1949 | (wbio->bi_end_io == end_sync_read && | |
1950 | (i == r1_bio->read_disk || | |
1951 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1952 | continue; |
1953 | ||
3e198f78 N |
1954 | wbio->bi_rw = WRITE; |
1955 | wbio->bi_end_io = end_sync_write; | |
1da177e4 | 1956 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 1957 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 1958 | |
1da177e4 LT |
1959 | generic_make_request(wbio); |
1960 | } | |
1961 | ||
1962 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1963 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
1964 | int s = r1_bio->sectors; |
1965 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
1966 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1967 | reschedule_retry(r1_bio); | |
1968 | else { | |
1969 | put_buf(r1_bio); | |
1970 | md_done_sync(mddev, s, 1); | |
1971 | } | |
1da177e4 LT |
1972 | } |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * This is a kernel thread which: | |
1977 | * | |
1978 | * 1. Retries failed read operations on working mirrors. | |
1979 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1980 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1981 | */ |
1982 | ||
e8096360 | 1983 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
1984 | sector_t sect, int sectors) |
1985 | { | |
fd01b88c | 1986 | struct mddev *mddev = conf->mddev; |
867868fb N |
1987 | while(sectors) { |
1988 | int s = sectors; | |
1989 | int d = read_disk; | |
1990 | int success = 0; | |
1991 | int start; | |
3cb03002 | 1992 | struct md_rdev *rdev; |
867868fb N |
1993 | |
1994 | if (s > (PAGE_SIZE>>9)) | |
1995 | s = PAGE_SIZE >> 9; | |
1996 | ||
1997 | do { | |
1998 | /* Note: no rcu protection needed here | |
1999 | * as this is synchronous in the raid1d thread | |
2000 | * which is the thread that might remove | |
2001 | * a device. If raid1d ever becomes multi-threaded.... | |
2002 | */ | |
d2eb35ac N |
2003 | sector_t first_bad; |
2004 | int bad_sectors; | |
2005 | ||
867868fb N |
2006 | rdev = conf->mirrors[d].rdev; |
2007 | if (rdev && | |
da8840a7 | 2008 | (test_bit(In_sync, &rdev->flags) || |
2009 | (!test_bit(Faulty, &rdev->flags) && | |
2010 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac N |
2011 | is_badblock(rdev, sect, s, |
2012 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
2013 | sync_page_io(rdev, sect, s<<9, |
2014 | conf->tmppage, READ, false)) | |
867868fb N |
2015 | success = 1; |
2016 | else { | |
2017 | d++; | |
8f19ccb2 | 2018 | if (d == conf->raid_disks * 2) |
867868fb N |
2019 | d = 0; |
2020 | } | |
2021 | } while (!success && d != read_disk); | |
2022 | ||
2023 | if (!success) { | |
d8f05d29 | 2024 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2025 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2026 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2027 | md_error(mddev, rdev); | |
867868fb N |
2028 | break; |
2029 | } | |
2030 | /* write it back and re-read */ | |
2031 | start = d; | |
2032 | while (d != read_disk) { | |
2033 | if (d==0) | |
8f19ccb2 | 2034 | d = conf->raid_disks * 2; |
867868fb N |
2035 | d--; |
2036 | rdev = conf->mirrors[d].rdev; | |
2037 | if (rdev && | |
d8f05d29 N |
2038 | test_bit(In_sync, &rdev->flags)) |
2039 | r1_sync_page_io(rdev, sect, s, | |
2040 | conf->tmppage, WRITE); | |
867868fb N |
2041 | } |
2042 | d = start; | |
2043 | while (d != read_disk) { | |
2044 | char b[BDEVNAME_SIZE]; | |
2045 | if (d==0) | |
8f19ccb2 | 2046 | d = conf->raid_disks * 2; |
867868fb N |
2047 | d--; |
2048 | rdev = conf->mirrors[d].rdev; | |
2049 | if (rdev && | |
2050 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
2051 | if (r1_sync_page_io(rdev, sect, s, |
2052 | conf->tmppage, READ)) { | |
867868fb N |
2053 | atomic_add(s, &rdev->corrected_errors); |
2054 | printk(KERN_INFO | |
9dd1e2fa | 2055 | "md/raid1:%s: read error corrected " |
867868fb N |
2056 | "(%d sectors at %llu on %s)\n", |
2057 | mdname(mddev), s, | |
969b755a RD |
2058 | (unsigned long long)(sect + |
2059 | rdev->data_offset), | |
867868fb N |
2060 | bdevname(rdev->bdev, b)); |
2061 | } | |
2062 | } | |
2063 | } | |
2064 | sectors -= s; | |
2065 | sect += s; | |
2066 | } | |
2067 | } | |
2068 | ||
9f2c9d12 | 2069 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2070 | { |
fd01b88c | 2071 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2072 | struct r1conf *conf = mddev->private; |
3cb03002 | 2073 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2074 | |
2075 | /* bio has the data to be written to device 'i' where | |
2076 | * we just recently had a write error. | |
2077 | * We repeatedly clone the bio and trim down to one block, | |
2078 | * then try the write. Where the write fails we record | |
2079 | * a bad block. | |
2080 | * It is conceivable that the bio doesn't exactly align with | |
2081 | * blocks. We must handle this somehow. | |
2082 | * | |
2083 | * We currently own a reference on the rdev. | |
2084 | */ | |
2085 | ||
2086 | int block_sectors; | |
2087 | sector_t sector; | |
2088 | int sectors; | |
2089 | int sect_to_write = r1_bio->sectors; | |
2090 | int ok = 1; | |
2091 | ||
2092 | if (rdev->badblocks.shift < 0) | |
2093 | return 0; | |
2094 | ||
2095 | block_sectors = 1 << rdev->badblocks.shift; | |
2096 | sector = r1_bio->sector; | |
2097 | sectors = ((sector + block_sectors) | |
2098 | & ~(sector_t)(block_sectors - 1)) | |
2099 | - sector; | |
2100 | ||
cd5ff9a1 N |
2101 | while (sect_to_write) { |
2102 | struct bio *wbio; | |
2103 | if (sectors > sect_to_write) | |
2104 | sectors = sect_to_write; | |
2105 | /* Write at 'sector' for 'sectors'*/ | |
2106 | ||
b783863f KO |
2107 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
2108 | unsigned vcnt = r1_bio->behind_page_count; | |
2109 | struct bio_vec *vec = r1_bio->behind_bvecs; | |
2110 | ||
2111 | while (!vec->bv_page) { | |
2112 | vec++; | |
2113 | vcnt--; | |
2114 | } | |
2115 | ||
2116 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2117 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2118 | ||
2119 | wbio->bi_vcnt = vcnt; | |
2120 | } else { | |
2121 | wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2122 | } | |
2123 | ||
cd5ff9a1 | 2124 | wbio->bi_rw = WRITE; |
b783863f | 2125 | wbio->bi_sector = r1_bio->sector; |
cd5ff9a1 | 2126 | wbio->bi_size = r1_bio->sectors << 9; |
cd5ff9a1 N |
2127 | |
2128 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
2129 | wbio->bi_sector += rdev->data_offset; | |
2130 | wbio->bi_bdev = rdev->bdev; | |
2131 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2132 | /* failure! */ | |
2133 | ok = rdev_set_badblocks(rdev, sector, | |
2134 | sectors, 0) | |
2135 | && ok; | |
2136 | ||
2137 | bio_put(wbio); | |
2138 | sect_to_write -= sectors; | |
2139 | sector += sectors; | |
2140 | sectors = block_sectors; | |
2141 | } | |
2142 | return ok; | |
2143 | } | |
2144 | ||
e8096360 | 2145 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2146 | { |
2147 | int m; | |
2148 | int s = r1_bio->sectors; | |
8f19ccb2 | 2149 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2150 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2151 | struct bio *bio = r1_bio->bios[m]; |
2152 | if (bio->bi_end_io == NULL) | |
2153 | continue; | |
2154 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2155 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
c6563a8c | 2156 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce N |
2157 | } |
2158 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2159 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
2160 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2161 | md_error(conf->mddev, rdev); | |
2162 | } | |
2163 | } | |
2164 | put_buf(r1_bio); | |
2165 | md_done_sync(conf->mddev, s, 1); | |
2166 | } | |
2167 | ||
e8096360 | 2168 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2169 | { |
2170 | int m; | |
8f19ccb2 | 2171 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2172 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2173 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2174 | rdev_clear_badblocks(rdev, |
2175 | r1_bio->sector, | |
c6563a8c | 2176 | r1_bio->sectors, 0); |
62096bce N |
2177 | rdev_dec_pending(rdev, conf->mddev); |
2178 | } else if (r1_bio->bios[m] != NULL) { | |
2179 | /* This drive got a write error. We need to | |
2180 | * narrow down and record precise write | |
2181 | * errors. | |
2182 | */ | |
2183 | if (!narrow_write_error(r1_bio, m)) { | |
2184 | md_error(conf->mddev, | |
2185 | conf->mirrors[m].rdev); | |
2186 | /* an I/O failed, we can't clear the bitmap */ | |
2187 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2188 | } | |
2189 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2190 | conf->mddev); | |
2191 | } | |
2192 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2193 | close_write(r1_bio); | |
2194 | raid_end_bio_io(r1_bio); | |
2195 | } | |
2196 | ||
e8096360 | 2197 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2198 | { |
2199 | int disk; | |
2200 | int max_sectors; | |
fd01b88c | 2201 | struct mddev *mddev = conf->mddev; |
62096bce N |
2202 | struct bio *bio; |
2203 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2204 | struct md_rdev *rdev; |
62096bce N |
2205 | |
2206 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2207 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2208 | * the block and we can fix it. | |
2209 | * We freeze all other IO, and try reading the block from | |
2210 | * other devices. When we find one, we re-write | |
2211 | * and check it that fixes the read error. | |
2212 | * This is all done synchronously while the array is | |
2213 | * frozen | |
2214 | */ | |
2215 | if (mddev->ro == 0) { | |
e2d59925 | 2216 | freeze_array(conf, 1); |
62096bce N |
2217 | fix_read_error(conf, r1_bio->read_disk, |
2218 | r1_bio->sector, r1_bio->sectors); | |
2219 | unfreeze_array(conf); | |
2220 | } else | |
2221 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
7ad4d4a6 | 2222 | rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); |
62096bce N |
2223 | |
2224 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2225 | bdevname(bio->bi_bdev, b); | |
2226 | read_more: | |
2227 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2228 | if (disk == -1) { | |
2229 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
2230 | " read error for block %llu\n", | |
2231 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
2232 | raid_end_bio_io(r1_bio); | |
2233 | } else { | |
2234 | const unsigned long do_sync | |
2235 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
2236 | if (bio) { | |
2237 | r1_bio->bios[r1_bio->read_disk] = | |
2238 | mddev->ro ? IO_BLOCKED : NULL; | |
2239 | bio_put(bio); | |
2240 | } | |
2241 | r1_bio->read_disk = disk; | |
2242 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2243 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
2244 | r1_bio->bios[r1_bio->read_disk] = bio; | |
2245 | rdev = conf->mirrors[disk].rdev; | |
2246 | printk_ratelimited(KERN_ERR | |
2247 | "md/raid1:%s: redirecting sector %llu" | |
2248 | " to other mirror: %s\n", | |
2249 | mdname(mddev), | |
2250 | (unsigned long long)r1_bio->sector, | |
2251 | bdevname(rdev->bdev, b)); | |
2252 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
2253 | bio->bi_bdev = rdev->bdev; | |
2254 | bio->bi_end_io = raid1_end_read_request; | |
2255 | bio->bi_rw = READ | do_sync; | |
2256 | bio->bi_private = r1_bio; | |
2257 | if (max_sectors < r1_bio->sectors) { | |
2258 | /* Drat - have to split this up more */ | |
2259 | struct bio *mbio = r1_bio->master_bio; | |
2260 | int sectors_handled = (r1_bio->sector + max_sectors | |
2261 | - mbio->bi_sector); | |
2262 | r1_bio->sectors = max_sectors; | |
2263 | spin_lock_irq(&conf->device_lock); | |
2264 | if (mbio->bi_phys_segments == 0) | |
2265 | mbio->bi_phys_segments = 2; | |
2266 | else | |
2267 | mbio->bi_phys_segments++; | |
2268 | spin_unlock_irq(&conf->device_lock); | |
2269 | generic_make_request(bio); | |
2270 | bio = NULL; | |
2271 | ||
2272 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2273 | ||
2274 | r1_bio->master_bio = mbio; | |
aa8b57aa | 2275 | r1_bio->sectors = bio_sectors(mbio) - sectors_handled; |
62096bce N |
2276 | r1_bio->state = 0; |
2277 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2278 | r1_bio->mddev = mddev; | |
2279 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2280 | ||
2281 | goto read_more; | |
2282 | } else | |
2283 | generic_make_request(bio); | |
2284 | } | |
2285 | } | |
2286 | ||
4ed8731d | 2287 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2288 | { |
4ed8731d | 2289 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2290 | struct r1bio *r1_bio; |
1da177e4 | 2291 | unsigned long flags; |
e8096360 | 2292 | struct r1conf *conf = mddev->private; |
1da177e4 | 2293 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2294 | struct blk_plug plug; |
1da177e4 LT |
2295 | |
2296 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2297 | |
2298 | blk_start_plug(&plug); | |
1da177e4 | 2299 | for (;;) { |
191ea9b2 | 2300 | |
0021b7bc | 2301 | flush_pending_writes(conf); |
191ea9b2 | 2302 | |
a35e63ef N |
2303 | spin_lock_irqsave(&conf->device_lock, flags); |
2304 | if (list_empty(head)) { | |
2305 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2306 | break; |
a35e63ef | 2307 | } |
9f2c9d12 | 2308 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2309 | list_del(head->prev); |
ddaf22ab | 2310 | conf->nr_queued--; |
1da177e4 LT |
2311 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2312 | ||
2313 | mddev = r1_bio->mddev; | |
070ec55d | 2314 | conf = mddev->private; |
4367af55 | 2315 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2316 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2317 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2318 | handle_sync_write_finished(conf, r1_bio); | |
2319 | else | |
4367af55 | 2320 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2321 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2322 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2323 | handle_write_finished(conf, r1_bio); | |
2324 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2325 | handle_read_error(conf, r1_bio); | |
2326 | else | |
d2eb35ac N |
2327 | /* just a partial read to be scheduled from separate |
2328 | * context | |
2329 | */ | |
2330 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2331 | |
1d9d5241 | 2332 | cond_resched(); |
de393cde N |
2333 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2334 | md_check_recovery(mddev); | |
1da177e4 | 2335 | } |
e1dfa0a2 | 2336 | blk_finish_plug(&plug); |
1da177e4 LT |
2337 | } |
2338 | ||
2339 | ||
e8096360 | 2340 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2341 | { |
2342 | int buffs; | |
2343 | ||
2344 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2345 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2346 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2347 | conf->poolinfo); | |
2348 | if (!conf->r1buf_pool) | |
2349 | return -ENOMEM; | |
2350 | conf->next_resync = 0; | |
2351 | return 0; | |
2352 | } | |
2353 | ||
2354 | /* | |
2355 | * perform a "sync" on one "block" | |
2356 | * | |
2357 | * We need to make sure that no normal I/O request - particularly write | |
2358 | * requests - conflict with active sync requests. | |
2359 | * | |
2360 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2361 | * that can be installed to exclude normal IO requests. | |
2362 | */ | |
2363 | ||
fd01b88c | 2364 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2365 | { |
e8096360 | 2366 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2367 | struct r1bio *r1_bio; |
1da177e4 LT |
2368 | struct bio *bio; |
2369 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2370 | int disk = -1; |
1da177e4 | 2371 | int i; |
3e198f78 N |
2372 | int wonly = -1; |
2373 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2374 | sector_t sync_blocks; |
e3b9703e | 2375 | int still_degraded = 0; |
06f60385 N |
2376 | int good_sectors = RESYNC_SECTORS; |
2377 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2378 | |
2379 | if (!conf->r1buf_pool) | |
2380 | if (init_resync(conf)) | |
57afd89f | 2381 | return 0; |
1da177e4 | 2382 | |
58c0fed4 | 2383 | max_sector = mddev->dev_sectors; |
1da177e4 | 2384 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2385 | /* If we aborted, we need to abort the |
2386 | * sync on the 'current' bitmap chunk (there will | |
2387 | * only be one in raid1 resync. | |
2388 | * We can find the current addess in mddev->curr_resync | |
2389 | */ | |
6a806c51 N |
2390 | if (mddev->curr_resync < max_sector) /* aborted */ |
2391 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2392 | &sync_blocks, 1); |
6a806c51 | 2393 | else /* completed sync */ |
191ea9b2 | 2394 | conf->fullsync = 0; |
6a806c51 N |
2395 | |
2396 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2397 | close_sync(conf); |
2398 | return 0; | |
2399 | } | |
2400 | ||
07d84d10 N |
2401 | if (mddev->bitmap == NULL && |
2402 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2403 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2404 | conf->fullsync == 0) { |
2405 | *skipped = 1; | |
2406 | return max_sector - sector_nr; | |
2407 | } | |
6394cca5 N |
2408 | /* before building a request, check if we can skip these blocks.. |
2409 | * This call the bitmap_start_sync doesn't actually record anything | |
2410 | */ | |
e3b9703e | 2411 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2412 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2413 | /* We can skip this block, and probably several more */ |
2414 | *skipped = 1; | |
2415 | return sync_blocks; | |
2416 | } | |
1da177e4 | 2417 | /* |
17999be4 N |
2418 | * If there is non-resync activity waiting for a turn, |
2419 | * and resync is going fast enough, | |
2420 | * then let it though before starting on this new sync request. | |
1da177e4 | 2421 | */ |
17999be4 | 2422 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2423 | msleep_interruptible(1000); |
17999be4 | 2424 | |
b47490c9 | 2425 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2426 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2427 | raise_barrier(conf); |
2428 | ||
2429 | conf->next_resync = sector_nr; | |
1da177e4 | 2430 | |
3e198f78 | 2431 | rcu_read_lock(); |
1da177e4 | 2432 | /* |
3e198f78 N |
2433 | * If we get a correctably read error during resync or recovery, |
2434 | * we might want to read from a different device. So we | |
2435 | * flag all drives that could conceivably be read from for READ, | |
2436 | * and any others (which will be non-In_sync devices) for WRITE. | |
2437 | * If a read fails, we try reading from something else for which READ | |
2438 | * is OK. | |
1da177e4 | 2439 | */ |
1da177e4 | 2440 | |
1da177e4 LT |
2441 | r1_bio->mddev = mddev; |
2442 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2443 | r1_bio->state = 0; |
1da177e4 | 2444 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 | 2445 | |
8f19ccb2 | 2446 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2447 | struct md_rdev *rdev; |
1da177e4 | 2448 | bio = r1_bio->bios[i]; |
2aabaa65 | 2449 | bio_reset(bio); |
1da177e4 | 2450 | |
3e198f78 N |
2451 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2452 | if (rdev == NULL || | |
06f60385 | 2453 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2454 | if (i < conf->raid_disks) |
2455 | still_degraded = 1; | |
3e198f78 | 2456 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2457 | bio->bi_rw = WRITE; |
2458 | bio->bi_end_io = end_sync_write; | |
2459 | write_targets ++; | |
3e198f78 N |
2460 | } else { |
2461 | /* may need to read from here */ | |
06f60385 N |
2462 | sector_t first_bad = MaxSector; |
2463 | int bad_sectors; | |
2464 | ||
2465 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2466 | &first_bad, &bad_sectors)) { | |
2467 | if (first_bad > sector_nr) | |
2468 | good_sectors = first_bad - sector_nr; | |
2469 | else { | |
2470 | bad_sectors -= (sector_nr - first_bad); | |
2471 | if (min_bad == 0 || | |
2472 | min_bad > bad_sectors) | |
2473 | min_bad = bad_sectors; | |
2474 | } | |
2475 | } | |
2476 | if (sector_nr < first_bad) { | |
2477 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2478 | if (wonly < 0) | |
2479 | wonly = i; | |
2480 | } else { | |
2481 | if (disk < 0) | |
2482 | disk = i; | |
2483 | } | |
2484 | bio->bi_rw = READ; | |
2485 | bio->bi_end_io = end_sync_read; | |
2486 | read_targets++; | |
d57368af AL |
2487 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2488 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2489 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2490 | /* | |
2491 | * The device is suitable for reading (InSync), | |
2492 | * but has bad block(s) here. Let's try to correct them, | |
2493 | * if we are doing resync or repair. Otherwise, leave | |
2494 | * this device alone for this sync request. | |
2495 | */ | |
2496 | bio->bi_rw = WRITE; | |
2497 | bio->bi_end_io = end_sync_write; | |
2498 | write_targets++; | |
3e198f78 | 2499 | } |
3e198f78 | 2500 | } |
06f60385 N |
2501 | if (bio->bi_end_io) { |
2502 | atomic_inc(&rdev->nr_pending); | |
2503 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2504 | bio->bi_bdev = rdev->bdev; | |
2505 | bio->bi_private = r1_bio; | |
2506 | } | |
1da177e4 | 2507 | } |
3e198f78 N |
2508 | rcu_read_unlock(); |
2509 | if (disk < 0) | |
2510 | disk = wonly; | |
2511 | r1_bio->read_disk = disk; | |
191ea9b2 | 2512 | |
06f60385 N |
2513 | if (read_targets == 0 && min_bad > 0) { |
2514 | /* These sectors are bad on all InSync devices, so we | |
2515 | * need to mark them bad on all write targets | |
2516 | */ | |
2517 | int ok = 1; | |
8f19ccb2 | 2518 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2519 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2520 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2521 | ok = rdev_set_badblocks(rdev, sector_nr, |
2522 | min_bad, 0 | |
2523 | ) && ok; | |
2524 | } | |
2525 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2526 | *skipped = 1; | |
2527 | put_buf(r1_bio); | |
2528 | ||
2529 | if (!ok) { | |
2530 | /* Cannot record the badblocks, so need to | |
2531 | * abort the resync. | |
2532 | * If there are multiple read targets, could just | |
2533 | * fail the really bad ones ??? | |
2534 | */ | |
2535 | conf->recovery_disabled = mddev->recovery_disabled; | |
2536 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2537 | return 0; | |
2538 | } else | |
2539 | return min_bad; | |
2540 | ||
2541 | } | |
2542 | if (min_bad > 0 && min_bad < good_sectors) { | |
2543 | /* only resync enough to reach the next bad->good | |
2544 | * transition */ | |
2545 | good_sectors = min_bad; | |
2546 | } | |
2547 | ||
3e198f78 N |
2548 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2549 | /* extra read targets are also write targets */ | |
2550 | write_targets += read_targets-1; | |
2551 | ||
2552 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2553 | /* There is nowhere to write, so all non-sync |
2554 | * drives must be failed - so we are finished | |
2555 | */ | |
b7219ccb N |
2556 | sector_t rv; |
2557 | if (min_bad > 0) | |
2558 | max_sector = sector_nr + min_bad; | |
2559 | rv = max_sector - sector_nr; | |
57afd89f | 2560 | *skipped = 1; |
1da177e4 | 2561 | put_buf(r1_bio); |
1da177e4 LT |
2562 | return rv; |
2563 | } | |
2564 | ||
c6207277 N |
2565 | if (max_sector > mddev->resync_max) |
2566 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2567 | if (max_sector > sector_nr + good_sectors) |
2568 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2569 | nr_sectors = 0; |
289e99e8 | 2570 | sync_blocks = 0; |
1da177e4 LT |
2571 | do { |
2572 | struct page *page; | |
2573 | int len = PAGE_SIZE; | |
2574 | if (sector_nr + (len>>9) > max_sector) | |
2575 | len = (max_sector - sector_nr) << 9; | |
2576 | if (len == 0) | |
2577 | break; | |
6a806c51 N |
2578 | if (sync_blocks == 0) { |
2579 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2580 | &sync_blocks, still_degraded) && |
2581 | !conf->fullsync && | |
2582 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2583 | break; |
9e77c485 | 2584 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2585 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2586 | len = sync_blocks<<9; |
ab7a30c7 | 2587 | } |
191ea9b2 | 2588 | |
8f19ccb2 | 2589 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2590 | bio = r1_bio->bios[i]; |
2591 | if (bio->bi_end_io) { | |
d11c171e | 2592 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2593 | if (bio_add_page(bio, page, len, 0) == 0) { |
2594 | /* stop here */ | |
d11c171e | 2595 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2596 | while (i > 0) { |
2597 | i--; | |
2598 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2599 | if (bio->bi_end_io==NULL) |
2600 | continue; | |
1da177e4 LT |
2601 | /* remove last page from this bio */ |
2602 | bio->bi_vcnt--; | |
2603 | bio->bi_size -= len; | |
2604 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2605 | } | |
2606 | goto bio_full; | |
2607 | } | |
2608 | } | |
2609 | } | |
2610 | nr_sectors += len>>9; | |
2611 | sector_nr += len>>9; | |
191ea9b2 | 2612 | sync_blocks -= (len>>9); |
1da177e4 LT |
2613 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2614 | bio_full: | |
1da177e4 LT |
2615 | r1_bio->sectors = nr_sectors; |
2616 | ||
d11c171e N |
2617 | /* For a user-requested sync, we read all readable devices and do a |
2618 | * compare | |
2619 | */ | |
2620 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2621 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2622 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2623 | bio = r1_bio->bios[i]; |
2624 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2625 | read_targets--; |
ddac7c7e | 2626 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2627 | generic_make_request(bio); |
2628 | } | |
2629 | } | |
2630 | } else { | |
2631 | atomic_set(&r1_bio->remaining, 1); | |
2632 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2633 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2634 | generic_make_request(bio); |
1da177e4 | 2635 | |
d11c171e | 2636 | } |
1da177e4 LT |
2637 | return nr_sectors; |
2638 | } | |
2639 | ||
fd01b88c | 2640 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2641 | { |
2642 | if (sectors) | |
2643 | return sectors; | |
2644 | ||
2645 | return mddev->dev_sectors; | |
2646 | } | |
2647 | ||
e8096360 | 2648 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2649 | { |
e8096360 | 2650 | struct r1conf *conf; |
709ae487 | 2651 | int i; |
0eaf822c | 2652 | struct raid1_info *disk; |
3cb03002 | 2653 | struct md_rdev *rdev; |
709ae487 | 2654 | int err = -ENOMEM; |
1da177e4 | 2655 | |
e8096360 | 2656 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2657 | if (!conf) |
709ae487 | 2658 | goto abort; |
1da177e4 | 2659 | |
0eaf822c | 2660 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2661 | * mddev->raid_disks * 2, |
1da177e4 LT |
2662 | GFP_KERNEL); |
2663 | if (!conf->mirrors) | |
709ae487 | 2664 | goto abort; |
1da177e4 | 2665 | |
ddaf22ab N |
2666 | conf->tmppage = alloc_page(GFP_KERNEL); |
2667 | if (!conf->tmppage) | |
709ae487 | 2668 | goto abort; |
ddaf22ab | 2669 | |
709ae487 | 2670 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2671 | if (!conf->poolinfo) |
709ae487 | 2672 | goto abort; |
8f19ccb2 | 2673 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2674 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2675 | r1bio_pool_free, | |
2676 | conf->poolinfo); | |
2677 | if (!conf->r1bio_pool) | |
709ae487 N |
2678 | goto abort; |
2679 | ||
ed9bfdf1 | 2680 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2681 | |
c19d5798 | 2682 | err = -EINVAL; |
e7e72bf6 | 2683 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2684 | rdev_for_each(rdev, mddev) { |
aba336bd | 2685 | struct request_queue *q; |
709ae487 | 2686 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2687 | if (disk_idx >= mddev->raid_disks |
2688 | || disk_idx < 0) | |
2689 | continue; | |
c19d5798 | 2690 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2691 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2692 | else |
2693 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2694 | |
c19d5798 N |
2695 | if (disk->rdev) |
2696 | goto abort; | |
1da177e4 | 2697 | disk->rdev = rdev; |
aba336bd N |
2698 | q = bdev_get_queue(rdev->bdev); |
2699 | if (q->merge_bvec_fn) | |
2700 | mddev->merge_check_needed = 1; | |
1da177e4 LT |
2701 | |
2702 | disk->head_position = 0; | |
12cee5a8 | 2703 | disk->seq_start = MaxSector; |
1da177e4 LT |
2704 | } |
2705 | conf->raid_disks = mddev->raid_disks; | |
2706 | conf->mddev = mddev; | |
1da177e4 | 2707 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2708 | |
2709 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2710 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2711 | |
191ea9b2 | 2712 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2713 | conf->pending_count = 0; |
d890fa2b | 2714 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2715 | |
c19d5798 | 2716 | err = -EIO; |
8f19ccb2 | 2717 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2718 | |
2719 | disk = conf->mirrors + i; | |
2720 | ||
c19d5798 N |
2721 | if (i < conf->raid_disks && |
2722 | disk[conf->raid_disks].rdev) { | |
2723 | /* This slot has a replacement. */ | |
2724 | if (!disk->rdev) { | |
2725 | /* No original, just make the replacement | |
2726 | * a recovering spare | |
2727 | */ | |
2728 | disk->rdev = | |
2729 | disk[conf->raid_disks].rdev; | |
2730 | disk[conf->raid_disks].rdev = NULL; | |
2731 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2732 | /* Original is not in_sync - bad */ | |
2733 | goto abort; | |
2734 | } | |
2735 | ||
5fd6c1dc N |
2736 | if (!disk->rdev || |
2737 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2738 | disk->head_position = 0; |
4f0a5e01 JB |
2739 | if (disk->rdev && |
2740 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2741 | conf->fullsync = 1; |
be4d3280 | 2742 | } |
1da177e4 | 2743 | } |
709ae487 | 2744 | |
709ae487 | 2745 | err = -ENOMEM; |
0232605d | 2746 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
709ae487 N |
2747 | if (!conf->thread) { |
2748 | printk(KERN_ERR | |
9dd1e2fa | 2749 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2750 | mdname(mddev)); |
2751 | goto abort; | |
11ce99e6 | 2752 | } |
1da177e4 | 2753 | |
709ae487 N |
2754 | return conf; |
2755 | ||
2756 | abort: | |
2757 | if (conf) { | |
2758 | if (conf->r1bio_pool) | |
2759 | mempool_destroy(conf->r1bio_pool); | |
2760 | kfree(conf->mirrors); | |
2761 | safe_put_page(conf->tmppage); | |
2762 | kfree(conf->poolinfo); | |
2763 | kfree(conf); | |
2764 | } | |
2765 | return ERR_PTR(err); | |
2766 | } | |
2767 | ||
5220ea1e | 2768 | static int stop(struct mddev *mddev); |
fd01b88c | 2769 | static int run(struct mddev *mddev) |
709ae487 | 2770 | { |
e8096360 | 2771 | struct r1conf *conf; |
709ae487 | 2772 | int i; |
3cb03002 | 2773 | struct md_rdev *rdev; |
5220ea1e | 2774 | int ret; |
2ff8cc2c | 2775 | bool discard_supported = false; |
709ae487 N |
2776 | |
2777 | if (mddev->level != 1) { | |
9dd1e2fa | 2778 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2779 | mdname(mddev), mddev->level); |
2780 | return -EIO; | |
2781 | } | |
2782 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2783 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2784 | mdname(mddev)); |
2785 | return -EIO; | |
2786 | } | |
1da177e4 | 2787 | /* |
709ae487 N |
2788 | * copy the already verified devices into our private RAID1 |
2789 | * bookkeeping area. [whatever we allocate in run(), | |
2790 | * should be freed in stop()] | |
1da177e4 | 2791 | */ |
709ae487 N |
2792 | if (mddev->private == NULL) |
2793 | conf = setup_conf(mddev); | |
2794 | else | |
2795 | conf = mddev->private; | |
1da177e4 | 2796 | |
709ae487 N |
2797 | if (IS_ERR(conf)) |
2798 | return PTR_ERR(conf); | |
1da177e4 | 2799 | |
c8dc9c65 | 2800 | if (mddev->queue) |
5026d7a9 PA |
2801 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
2802 | ||
dafb20fa | 2803 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
2804 | if (!mddev->gendisk) |
2805 | continue; | |
709ae487 N |
2806 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2807 | rdev->data_offset << 9); | |
2ff8cc2c SL |
2808 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2809 | discard_supported = true; | |
1da177e4 | 2810 | } |
191ea9b2 | 2811 | |
709ae487 N |
2812 | mddev->degraded = 0; |
2813 | for (i=0; i < conf->raid_disks; i++) | |
2814 | if (conf->mirrors[i].rdev == NULL || | |
2815 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2816 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2817 | mddev->degraded++; | |
2818 | ||
2819 | if (conf->raid_disks - mddev->degraded == 1) | |
2820 | mddev->recovery_cp = MaxSector; | |
2821 | ||
8c6ac868 | 2822 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2823 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2824 | " -- starting background reconstruction\n", |
2825 | mdname(mddev)); | |
1da177e4 | 2826 | printk(KERN_INFO |
9dd1e2fa | 2827 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2828 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2829 | mddev->raid_disks); | |
709ae487 | 2830 | |
1da177e4 LT |
2831 | /* |
2832 | * Ok, everything is just fine now | |
2833 | */ | |
709ae487 N |
2834 | mddev->thread = conf->thread; |
2835 | conf->thread = NULL; | |
2836 | mddev->private = conf; | |
2837 | ||
1f403624 | 2838 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2839 | |
1ed7242e JB |
2840 | if (mddev->queue) { |
2841 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2842 | mddev->queue->backing_dev_info.congested_data = mddev; | |
6b740b8d | 2843 | blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); |
2ff8cc2c SL |
2844 | |
2845 | if (discard_supported) | |
2846 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
2847 | mddev->queue); | |
2848 | else | |
2849 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
2850 | mddev->queue); | |
1ed7242e | 2851 | } |
5220ea1e | 2852 | |
2853 | ret = md_integrity_register(mddev); | |
2854 | if (ret) | |
2855 | stop(mddev); | |
2856 | return ret; | |
1da177e4 LT |
2857 | } |
2858 | ||
fd01b88c | 2859 | static int stop(struct mddev *mddev) |
1da177e4 | 2860 | { |
e8096360 | 2861 | struct r1conf *conf = mddev->private; |
4b6d287f | 2862 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2863 | |
2864 | /* wait for behind writes to complete */ | |
e555190d | 2865 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2866 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2867 | mdname(mddev)); | |
4b6d287f | 2868 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2869 | wait_event(bitmap->behind_wait, |
2870 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2871 | } |
1da177e4 | 2872 | |
409c57f3 N |
2873 | raise_barrier(conf); |
2874 | lower_barrier(conf); | |
2875 | ||
01f96c0a | 2876 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2877 | if (conf->r1bio_pool) |
2878 | mempool_destroy(conf->r1bio_pool); | |
990a8baf | 2879 | kfree(conf->mirrors); |
0fea7ed8 | 2880 | safe_put_page(conf->tmppage); |
990a8baf | 2881 | kfree(conf->poolinfo); |
1da177e4 LT |
2882 | kfree(conf); |
2883 | mddev->private = NULL; | |
2884 | return 0; | |
2885 | } | |
2886 | ||
fd01b88c | 2887 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2888 | { |
2889 | /* no resync is happening, and there is enough space | |
2890 | * on all devices, so we can resize. | |
2891 | * We need to make sure resync covers any new space. | |
2892 | * If the array is shrinking we should possibly wait until | |
2893 | * any io in the removed space completes, but it hardly seems | |
2894 | * worth it. | |
2895 | */ | |
a4a6125a N |
2896 | sector_t newsize = raid1_size(mddev, sectors, 0); |
2897 | if (mddev->external_size && | |
2898 | mddev->array_sectors > newsize) | |
b522adcd | 2899 | return -EINVAL; |
a4a6125a N |
2900 | if (mddev->bitmap) { |
2901 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
2902 | if (ret) | |
2903 | return ret; | |
2904 | } | |
2905 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 2906 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2907 | revalidate_disk(mddev->gendisk); |
b522adcd | 2908 | if (sectors > mddev->dev_sectors && |
b098636c | 2909 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2910 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2911 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2912 | } | |
b522adcd | 2913 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2914 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2915 | return 0; |
2916 | } | |
2917 | ||
fd01b88c | 2918 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
2919 | { |
2920 | /* We need to: | |
2921 | * 1/ resize the r1bio_pool | |
2922 | * 2/ resize conf->mirrors | |
2923 | * | |
2924 | * We allocate a new r1bio_pool if we can. | |
2925 | * Then raise a device barrier and wait until all IO stops. | |
2926 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2927 | * |
2928 | * At the same time, we "pack" the devices so that all the missing | |
2929 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2930 | */ |
2931 | mempool_t *newpool, *oldpool; | |
2932 | struct pool_info *newpoolinfo; | |
0eaf822c | 2933 | struct raid1_info *newmirrors; |
e8096360 | 2934 | struct r1conf *conf = mddev->private; |
63c70c4f | 2935 | int cnt, raid_disks; |
c04be0aa | 2936 | unsigned long flags; |
b5470dc5 | 2937 | int d, d2, err; |
1da177e4 | 2938 | |
63c70c4f | 2939 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2940 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2941 | mddev->layout != mddev->new_layout || |
2942 | mddev->level != mddev->new_level) { | |
664e7c41 | 2943 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2944 | mddev->new_layout = mddev->layout; |
2945 | mddev->new_level = mddev->level; | |
2946 | return -EINVAL; | |
2947 | } | |
2948 | ||
b5470dc5 DW |
2949 | err = md_allow_write(mddev); |
2950 | if (err) | |
2951 | return err; | |
2a2275d6 | 2952 | |
63c70c4f N |
2953 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2954 | ||
6ea9c07c N |
2955 | if (raid_disks < conf->raid_disks) { |
2956 | cnt=0; | |
2957 | for (d= 0; d < conf->raid_disks; d++) | |
2958 | if (conf->mirrors[d].rdev) | |
2959 | cnt++; | |
2960 | if (cnt > raid_disks) | |
1da177e4 | 2961 | return -EBUSY; |
6ea9c07c | 2962 | } |
1da177e4 LT |
2963 | |
2964 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2965 | if (!newpoolinfo) | |
2966 | return -ENOMEM; | |
2967 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 2968 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
2969 | |
2970 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2971 | r1bio_pool_free, newpoolinfo); | |
2972 | if (!newpool) { | |
2973 | kfree(newpoolinfo); | |
2974 | return -ENOMEM; | |
2975 | } | |
0eaf822c | 2976 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 2977 | GFP_KERNEL); |
1da177e4 LT |
2978 | if (!newmirrors) { |
2979 | kfree(newpoolinfo); | |
2980 | mempool_destroy(newpool); | |
2981 | return -ENOMEM; | |
2982 | } | |
1da177e4 | 2983 | |
e2d59925 | 2984 | freeze_array(conf, 0); |
1da177e4 LT |
2985 | |
2986 | /* ok, everything is stopped */ | |
2987 | oldpool = conf->r1bio_pool; | |
2988 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2989 | |
a88aa786 | 2990 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 2991 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 2992 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 2993 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2994 | rdev->raid_disk = d2; |
36fad858 NK |
2995 | sysfs_unlink_rdev(mddev, rdev); |
2996 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2997 | printk(KERN_WARNING |
36fad858 NK |
2998 | "md/raid1:%s: cannot register rd%d\n", |
2999 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3000 | } |
a88aa786 N |
3001 | if (rdev) |
3002 | newmirrors[d2++].rdev = rdev; | |
3003 | } | |
1da177e4 LT |
3004 | kfree(conf->mirrors); |
3005 | conf->mirrors = newmirrors; | |
3006 | kfree(conf->poolinfo); | |
3007 | conf->poolinfo = newpoolinfo; | |
3008 | ||
c04be0aa | 3009 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3010 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3011 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3012 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3013 | mddev->delta_disks = 0; |
1da177e4 | 3014 | |
e2d59925 | 3015 | unfreeze_array(conf); |
1da177e4 LT |
3016 | |
3017 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3018 | md_wakeup_thread(mddev->thread); | |
3019 | ||
3020 | mempool_destroy(oldpool); | |
3021 | return 0; | |
3022 | } | |
3023 | ||
fd01b88c | 3024 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3025 | { |
e8096360 | 3026 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3027 | |
3028 | switch(state) { | |
6eef4b21 N |
3029 | case 2: /* wake for suspend */ |
3030 | wake_up(&conf->wait_barrier); | |
3031 | break; | |
9e6603da | 3032 | case 1: |
17999be4 | 3033 | raise_barrier(conf); |
36fa3063 | 3034 | break; |
9e6603da | 3035 | case 0: |
17999be4 | 3036 | lower_barrier(conf); |
36fa3063 N |
3037 | break; |
3038 | } | |
36fa3063 N |
3039 | } |
3040 | ||
fd01b88c | 3041 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3042 | { |
3043 | /* raid1 can take over: | |
3044 | * raid5 with 2 devices, any layout or chunk size | |
3045 | */ | |
3046 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3047 | struct r1conf *conf; |
709ae487 N |
3048 | mddev->new_level = 1; |
3049 | mddev->new_layout = 0; | |
3050 | mddev->new_chunk_sectors = 0; | |
3051 | conf = setup_conf(mddev); | |
3052 | if (!IS_ERR(conf)) | |
3053 | conf->barrier = 1; | |
3054 | return conf; | |
3055 | } | |
3056 | return ERR_PTR(-EINVAL); | |
3057 | } | |
1da177e4 | 3058 | |
84fc4b56 | 3059 | static struct md_personality raid1_personality = |
1da177e4 LT |
3060 | { |
3061 | .name = "raid1", | |
2604b703 | 3062 | .level = 1, |
1da177e4 LT |
3063 | .owner = THIS_MODULE, |
3064 | .make_request = make_request, | |
3065 | .run = run, | |
3066 | .stop = stop, | |
3067 | .status = status, | |
3068 | .error_handler = error, | |
3069 | .hot_add_disk = raid1_add_disk, | |
3070 | .hot_remove_disk= raid1_remove_disk, | |
3071 | .spare_active = raid1_spare_active, | |
3072 | .sync_request = sync_request, | |
3073 | .resize = raid1_resize, | |
80c3a6ce | 3074 | .size = raid1_size, |
63c70c4f | 3075 | .check_reshape = raid1_reshape, |
36fa3063 | 3076 | .quiesce = raid1_quiesce, |
709ae487 | 3077 | .takeover = raid1_takeover, |
1da177e4 LT |
3078 | }; |
3079 | ||
3080 | static int __init raid_init(void) | |
3081 | { | |
2604b703 | 3082 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3083 | } |
3084 | ||
3085 | static void raid_exit(void) | |
3086 | { | |
2604b703 | 3087 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3088 | } |
3089 | ||
3090 | module_init(raid_init); | |
3091 | module_exit(raid_exit); | |
3092 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3093 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3094 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3095 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3096 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3097 | |
3098 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |