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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> |
bff61975 | 37 | #include <linux/seq_file.h> |
8bda470e | 38 | #include <linux/ratelimit.h> |
43b2e5d8 | 39 | #include "md.h" |
ef740c37 CH |
40 | #include "raid1.h" |
41 | #include "bitmap.h" | |
191ea9b2 | 42 | |
1da177e4 LT |
43 | /* |
44 | * Number of guaranteed r1bios in case of extreme VM load: | |
45 | */ | |
46 | #define NR_RAID1_BIOS 256 | |
47 | ||
1da177e4 | 48 | |
17999be4 N |
49 | static void allow_barrier(conf_t *conf); |
50 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 51 | |
dd0fc66f | 52 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
53 | { |
54 | struct pool_info *pi = data; | |
9f2c9d12 | 55 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
56 | |
57 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 58 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
59 | } |
60 | ||
61 | static void r1bio_pool_free(void *r1_bio, void *data) | |
62 | { | |
63 | kfree(r1_bio); | |
64 | } | |
65 | ||
66 | #define RESYNC_BLOCK_SIZE (64*1024) | |
67 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
68 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
69 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
70 | #define RESYNC_WINDOW (2048*1024) | |
71 | ||
dd0fc66f | 72 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
73 | { |
74 | struct pool_info *pi = data; | |
75 | struct page *page; | |
9f2c9d12 | 76 | struct r1bio *r1_bio; |
1da177e4 LT |
77 | struct bio *bio; |
78 | int i, j; | |
79 | ||
80 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 81 | if (!r1_bio) |
1da177e4 | 82 | return NULL; |
1da177e4 LT |
83 | |
84 | /* | |
85 | * Allocate bios : 1 for reading, n-1 for writing | |
86 | */ | |
87 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 88 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
89 | if (!bio) |
90 | goto out_free_bio; | |
91 | r1_bio->bios[j] = bio; | |
92 | } | |
93 | /* | |
94 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
95 | * the first bio. |
96 | * If this is a user-requested check/repair, allocate | |
97 | * RESYNC_PAGES for each bio. | |
1da177e4 | 98 | */ |
d11c171e N |
99 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
100 | j = pi->raid_disks; | |
101 | else | |
102 | j = 1; | |
103 | while(j--) { | |
104 | bio = r1_bio->bios[j]; | |
105 | for (i = 0; i < RESYNC_PAGES; i++) { | |
106 | page = alloc_page(gfp_flags); | |
107 | if (unlikely(!page)) | |
108 | goto out_free_pages; | |
109 | ||
110 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 111 | bio->bi_vcnt = i+1; |
d11c171e N |
112 | } |
113 | } | |
114 | /* If not user-requests, copy the page pointers to all bios */ | |
115 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
116 | for (i=0; i<RESYNC_PAGES ; i++) | |
117 | for (j=1; j<pi->raid_disks; j++) | |
118 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
119 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
120 | } |
121 | ||
122 | r1_bio->master_bio = NULL; | |
123 | ||
124 | return r1_bio; | |
125 | ||
126 | out_free_pages: | |
303a0e11 N |
127 | for (j=0 ; j < pi->raid_disks; j++) |
128 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
129 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 130 | j = -1; |
1da177e4 LT |
131 | out_free_bio: |
132 | while ( ++j < pi->raid_disks ) | |
133 | bio_put(r1_bio->bios[j]); | |
134 | r1bio_pool_free(r1_bio, data); | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
139 | { | |
140 | struct pool_info *pi = data; | |
d11c171e | 141 | int i,j; |
9f2c9d12 | 142 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 143 | |
d11c171e N |
144 | for (i = 0; i < RESYNC_PAGES; i++) |
145 | for (j = pi->raid_disks; j-- ;) { | |
146 | if (j == 0 || | |
147 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
148 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 149 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 150 | } |
1da177e4 LT |
151 | for (i=0 ; i < pi->raid_disks; i++) |
152 | bio_put(r1bio->bios[i]); | |
153 | ||
154 | r1bio_pool_free(r1bio, data); | |
155 | } | |
156 | ||
9f2c9d12 | 157 | static void put_all_bios(conf_t *conf, struct r1bio *r1_bio) |
1da177e4 LT |
158 | { |
159 | int i; | |
160 | ||
161 | for (i = 0; i < conf->raid_disks; i++) { | |
162 | struct bio **bio = r1_bio->bios + i; | |
4367af55 | 163 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
164 | bio_put(*bio); |
165 | *bio = NULL; | |
166 | } | |
167 | } | |
168 | ||
9f2c9d12 | 169 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 170 | { |
070ec55d | 171 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 172 | |
1da177e4 LT |
173 | put_all_bios(conf, r1_bio); |
174 | mempool_free(r1_bio, conf->r1bio_pool); | |
175 | } | |
176 | ||
9f2c9d12 | 177 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 178 | { |
070ec55d | 179 | conf_t *conf = r1_bio->mddev->private; |
3e198f78 N |
180 | int i; |
181 | ||
182 | for (i=0; i<conf->raid_disks; i++) { | |
183 | struct bio *bio = r1_bio->bios[i]; | |
184 | if (bio->bi_end_io) | |
185 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
186 | } | |
1da177e4 LT |
187 | |
188 | mempool_free(r1_bio, conf->r1buf_pool); | |
189 | ||
17999be4 | 190 | lower_barrier(conf); |
1da177e4 LT |
191 | } |
192 | ||
9f2c9d12 | 193 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
194 | { |
195 | unsigned long flags; | |
fd01b88c | 196 | struct mddev *mddev = r1_bio->mddev; |
070ec55d | 197 | conf_t *conf = mddev->private; |
1da177e4 LT |
198 | |
199 | spin_lock_irqsave(&conf->device_lock, flags); | |
200 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 201 | conf->nr_queued ++; |
1da177e4 LT |
202 | spin_unlock_irqrestore(&conf->device_lock, flags); |
203 | ||
17999be4 | 204 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
205 | md_wakeup_thread(mddev->thread); |
206 | } | |
207 | ||
208 | /* | |
209 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
210 | * operation and are ready to return a success/failure code to the buffer | |
211 | * cache layer. | |
212 | */ | |
9f2c9d12 | 213 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
214 | { |
215 | struct bio *bio = r1_bio->master_bio; | |
216 | int done; | |
217 | conf_t *conf = r1_bio->mddev->private; | |
218 | ||
219 | if (bio->bi_phys_segments) { | |
220 | unsigned long flags; | |
221 | spin_lock_irqsave(&conf->device_lock, flags); | |
222 | bio->bi_phys_segments--; | |
223 | done = (bio->bi_phys_segments == 0); | |
224 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
225 | } else | |
226 | done = 1; | |
227 | ||
228 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
229 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
230 | if (done) { | |
231 | bio_endio(bio, 0); | |
232 | /* | |
233 | * Wake up any possible resync thread that waits for the device | |
234 | * to go idle. | |
235 | */ | |
236 | allow_barrier(conf); | |
237 | } | |
238 | } | |
239 | ||
9f2c9d12 | 240 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
241 | { |
242 | struct bio *bio = r1_bio->master_bio; | |
243 | ||
4b6d287f N |
244 | /* if nobody has done the final endio yet, do it now */ |
245 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
246 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
247 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
248 | (unsigned long long) bio->bi_sector, | |
249 | (unsigned long long) bio->bi_sector + | |
250 | (bio->bi_size >> 9) - 1); | |
4b6d287f | 251 | |
d2eb35ac | 252 | call_bio_endio(r1_bio); |
4b6d287f | 253 | } |
1da177e4 LT |
254 | free_r1bio(r1_bio); |
255 | } | |
256 | ||
257 | /* | |
258 | * Update disk head position estimator based on IRQ completion info. | |
259 | */ | |
9f2c9d12 | 260 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 261 | { |
070ec55d | 262 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
263 | |
264 | conf->mirrors[disk].head_position = | |
265 | r1_bio->sector + (r1_bio->sectors); | |
266 | } | |
267 | ||
ba3ae3be NK |
268 | /* |
269 | * Find the disk number which triggered given bio | |
270 | */ | |
9f2c9d12 | 271 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
272 | { |
273 | int mirror; | |
274 | int raid_disks = r1_bio->mddev->raid_disks; | |
275 | ||
276 | for (mirror = 0; mirror < raid_disks; mirror++) | |
277 | if (r1_bio->bios[mirror] == bio) | |
278 | break; | |
279 | ||
280 | BUG_ON(mirror == raid_disks); | |
281 | update_head_pos(mirror, r1_bio); | |
282 | ||
283 | return mirror; | |
284 | } | |
285 | ||
6712ecf8 | 286 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
287 | { |
288 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 289 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 290 | int mirror; |
070ec55d | 291 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 292 | |
1da177e4 LT |
293 | mirror = r1_bio->read_disk; |
294 | /* | |
295 | * this branch is our 'one mirror IO has finished' event handler: | |
296 | */ | |
ddaf22ab N |
297 | update_head_pos(mirror, r1_bio); |
298 | ||
dd00a99e N |
299 | if (uptodate) |
300 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
301 | else { | |
302 | /* If all other devices have failed, we want to return | |
303 | * the error upwards rather than fail the last device. | |
304 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 305 | */ |
dd00a99e N |
306 | unsigned long flags; |
307 | spin_lock_irqsave(&conf->device_lock, flags); | |
308 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
309 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
310 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
311 | uptodate = 1; | |
312 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
313 | } | |
1da177e4 | 314 | |
dd00a99e | 315 | if (uptodate) |
1da177e4 | 316 | raid_end_bio_io(r1_bio); |
dd00a99e | 317 | else { |
1da177e4 LT |
318 | /* |
319 | * oops, read error: | |
320 | */ | |
321 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
322 | printk_ratelimited( |
323 | KERN_ERR "md/raid1:%s: %s: " | |
324 | "rescheduling sector %llu\n", | |
325 | mdname(conf->mddev), | |
326 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
327 | b), | |
328 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 329 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 LT |
330 | reschedule_retry(r1_bio); |
331 | } | |
332 | ||
333 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
334 | } |
335 | ||
9f2c9d12 | 336 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
337 | { |
338 | /* it really is the end of this request */ | |
339 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
340 | /* free extra copy of the data pages */ | |
341 | int i = r1_bio->behind_page_count; | |
342 | while (i--) | |
343 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
344 | kfree(r1_bio->behind_bvecs); | |
345 | r1_bio->behind_bvecs = NULL; | |
346 | } | |
347 | /* clear the bitmap if all writes complete successfully */ | |
348 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
349 | r1_bio->sectors, | |
350 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
351 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
352 | md_write_end(r1_bio->mddev); | |
353 | } | |
354 | ||
9f2c9d12 | 355 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 356 | { |
cd5ff9a1 N |
357 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
358 | return; | |
359 | ||
360 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
361 | reschedule_retry(r1_bio); | |
362 | else { | |
363 | close_write(r1_bio); | |
4367af55 N |
364 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
365 | reschedule_retry(r1_bio); | |
366 | else | |
367 | raid_end_bio_io(r1_bio); | |
4e78064f N |
368 | } |
369 | } | |
370 | ||
6712ecf8 | 371 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
372 | { |
373 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 374 | struct r1bio *r1_bio = bio->bi_private; |
a9701a30 | 375 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
070ec55d | 376 | conf_t *conf = r1_bio->mddev->private; |
04b857f7 | 377 | struct bio *to_put = NULL; |
1da177e4 | 378 | |
ba3ae3be | 379 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 380 | |
e9c7469b TH |
381 | /* |
382 | * 'one mirror IO has finished' event handler: | |
383 | */ | |
e9c7469b | 384 | if (!uptodate) { |
cd5ff9a1 N |
385 | set_bit(WriteErrorSeen, |
386 | &conf->mirrors[mirror].rdev->flags); | |
387 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 388 | } else { |
1da177e4 | 389 | /* |
e9c7469b TH |
390 | * Set R1BIO_Uptodate in our master bio, so that we |
391 | * will return a good error code for to the higher | |
392 | * levels even if IO on some other mirrored buffer | |
393 | * fails. | |
394 | * | |
395 | * The 'master' represents the composite IO operation | |
396 | * to user-side. So if something waits for IO, then it | |
397 | * will wait for the 'master' bio. | |
1da177e4 | 398 | */ |
4367af55 N |
399 | sector_t first_bad; |
400 | int bad_sectors; | |
401 | ||
cd5ff9a1 N |
402 | r1_bio->bios[mirror] = NULL; |
403 | to_put = bio; | |
e9c7469b TH |
404 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
405 | ||
4367af55 N |
406 | /* Maybe we can clear some bad blocks. */ |
407 | if (is_badblock(conf->mirrors[mirror].rdev, | |
408 | r1_bio->sector, r1_bio->sectors, | |
409 | &first_bad, &bad_sectors)) { | |
410 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
411 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
412 | } | |
413 | } | |
414 | ||
e9c7469b TH |
415 | if (behind) { |
416 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
417 | atomic_dec(&r1_bio->behind_remaining); | |
418 | ||
419 | /* | |
420 | * In behind mode, we ACK the master bio once the I/O | |
421 | * has safely reached all non-writemostly | |
422 | * disks. Setting the Returned bit ensures that this | |
423 | * gets done only once -- we don't ever want to return | |
424 | * -EIO here, instead we'll wait | |
425 | */ | |
426 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
427 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
428 | /* Maybe we can return now */ | |
429 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
430 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
431 | pr_debug("raid1: behind end write sectors" |
432 | " %llu-%llu\n", | |
433 | (unsigned long long) mbio->bi_sector, | |
434 | (unsigned long long) mbio->bi_sector + | |
435 | (mbio->bi_size >> 9) - 1); | |
d2eb35ac | 436 | call_bio_endio(r1_bio); |
4b6d287f N |
437 | } |
438 | } | |
439 | } | |
4367af55 N |
440 | if (r1_bio->bios[mirror] == NULL) |
441 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
442 | conf->mddev); | |
e9c7469b | 443 | |
1da177e4 | 444 | /* |
1da177e4 LT |
445 | * Let's see if all mirrored write operations have finished |
446 | * already. | |
447 | */ | |
af6d7b76 | 448 | r1_bio_write_done(r1_bio); |
c70810b3 | 449 | |
04b857f7 N |
450 | if (to_put) |
451 | bio_put(to_put); | |
1da177e4 LT |
452 | } |
453 | ||
454 | ||
455 | /* | |
456 | * This routine returns the disk from which the requested read should | |
457 | * be done. There is a per-array 'next expected sequential IO' sector | |
458 | * number - if this matches on the next IO then we use the last disk. | |
459 | * There is also a per-disk 'last know head position' sector that is | |
460 | * maintained from IRQ contexts, both the normal and the resync IO | |
461 | * completion handlers update this position correctly. If there is no | |
462 | * perfect sequential match then we pick the disk whose head is closest. | |
463 | * | |
464 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
465 | * because position is mirror, not device based. | |
466 | * | |
467 | * The rdev for the device selected will have nr_pending incremented. | |
468 | */ | |
9f2c9d12 | 469 | static int read_balance(conf_t *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 470 | { |
af3a2cd6 | 471 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
472 | int sectors; |
473 | int best_good_sectors; | |
f3ac8bf7 | 474 | int start_disk; |
76073054 | 475 | int best_disk; |
f3ac8bf7 | 476 | int i; |
76073054 | 477 | sector_t best_dist; |
3cb03002 | 478 | struct md_rdev *rdev; |
f3ac8bf7 | 479 | int choose_first; |
1da177e4 LT |
480 | |
481 | rcu_read_lock(); | |
482 | /* | |
8ddf9efe | 483 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
484 | * device if no resync is going on, or below the resync window. |
485 | * We take the first readable disk when above the resync window. | |
486 | */ | |
487 | retry: | |
d2eb35ac | 488 | sectors = r1_bio->sectors; |
76073054 N |
489 | best_disk = -1; |
490 | best_dist = MaxSector; | |
d2eb35ac N |
491 | best_good_sectors = 0; |
492 | ||
1da177e4 LT |
493 | if (conf->mddev->recovery_cp < MaxSector && |
494 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
495 | choose_first = 1; |
496 | start_disk = 0; | |
497 | } else { | |
498 | choose_first = 0; | |
499 | start_disk = conf->last_used; | |
1da177e4 LT |
500 | } |
501 | ||
f3ac8bf7 | 502 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 503 | sector_t dist; |
d2eb35ac N |
504 | sector_t first_bad; |
505 | int bad_sectors; | |
506 | ||
f3ac8bf7 N |
507 | int disk = start_disk + i; |
508 | if (disk >= conf->raid_disks) | |
509 | disk -= conf->raid_disks; | |
510 | ||
511 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
512 | if (r1_bio->bios[disk] == IO_BLOCKED | |
513 | || rdev == NULL | |
76073054 | 514 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 515 | continue; |
76073054 N |
516 | if (!test_bit(In_sync, &rdev->flags) && |
517 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 518 | continue; |
76073054 N |
519 | if (test_bit(WriteMostly, &rdev->flags)) { |
520 | /* Don't balance among write-mostly, just | |
521 | * use the first as a last resort */ | |
522 | if (best_disk < 0) | |
523 | best_disk = disk; | |
524 | continue; | |
525 | } | |
526 | /* This is a reasonable device to use. It might | |
527 | * even be best. | |
528 | */ | |
d2eb35ac N |
529 | if (is_badblock(rdev, this_sector, sectors, |
530 | &first_bad, &bad_sectors)) { | |
531 | if (best_dist < MaxSector) | |
532 | /* already have a better device */ | |
533 | continue; | |
534 | if (first_bad <= this_sector) { | |
535 | /* cannot read here. If this is the 'primary' | |
536 | * device, then we must not read beyond | |
537 | * bad_sectors from another device.. | |
538 | */ | |
539 | bad_sectors -= (this_sector - first_bad); | |
540 | if (choose_first && sectors > bad_sectors) | |
541 | sectors = bad_sectors; | |
542 | if (best_good_sectors > sectors) | |
543 | best_good_sectors = sectors; | |
544 | ||
545 | } else { | |
546 | sector_t good_sectors = first_bad - this_sector; | |
547 | if (good_sectors > best_good_sectors) { | |
548 | best_good_sectors = good_sectors; | |
549 | best_disk = disk; | |
550 | } | |
551 | if (choose_first) | |
552 | break; | |
553 | } | |
554 | continue; | |
555 | } else | |
556 | best_good_sectors = sectors; | |
557 | ||
76073054 N |
558 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
559 | if (choose_first | |
560 | /* Don't change to another disk for sequential reads */ | |
561 | || conf->next_seq_sect == this_sector | |
562 | || dist == 0 | |
563 | /* If device is idle, use it */ | |
564 | || atomic_read(&rdev->nr_pending) == 0) { | |
565 | best_disk = disk; | |
1da177e4 LT |
566 | break; |
567 | } | |
76073054 N |
568 | if (dist < best_dist) { |
569 | best_dist = dist; | |
570 | best_disk = disk; | |
1da177e4 | 571 | } |
f3ac8bf7 | 572 | } |
1da177e4 | 573 | |
76073054 N |
574 | if (best_disk >= 0) { |
575 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
576 | if (!rdev) |
577 | goto retry; | |
578 | atomic_inc(&rdev->nr_pending); | |
76073054 | 579 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
580 | /* cannot risk returning a device that failed |
581 | * before we inc'ed nr_pending | |
582 | */ | |
03c902e1 | 583 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
584 | goto retry; |
585 | } | |
d2eb35ac | 586 | sectors = best_good_sectors; |
8ddf9efe | 587 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 588 | conf->last_used = best_disk; |
1da177e4 LT |
589 | } |
590 | rcu_read_unlock(); | |
d2eb35ac | 591 | *max_sectors = sectors; |
1da177e4 | 592 | |
76073054 | 593 | return best_disk; |
1da177e4 LT |
594 | } |
595 | ||
fd01b88c | 596 | int md_raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 597 | { |
070ec55d | 598 | conf_t *conf = mddev->private; |
0d129228 N |
599 | int i, ret = 0; |
600 | ||
601 | rcu_read_lock(); | |
602 | for (i = 0; i < mddev->raid_disks; i++) { | |
3cb03002 | 603 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 604 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 605 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 606 | |
1ed7242e JB |
607 | BUG_ON(!q); |
608 | ||
0d129228 N |
609 | /* Note the '|| 1' - when read_balance prefers |
610 | * non-congested targets, it can be removed | |
611 | */ | |
91a9e99d | 612 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
613 | ret |= bdi_congested(&q->backing_dev_info, bits); |
614 | else | |
615 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
616 | } | |
617 | } | |
618 | rcu_read_unlock(); | |
619 | return ret; | |
620 | } | |
1ed7242e | 621 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 622 | |
1ed7242e JB |
623 | static int raid1_congested(void *data, int bits) |
624 | { | |
fd01b88c | 625 | struct mddev *mddev = data; |
1ed7242e JB |
626 | |
627 | return mddev_congested(mddev, bits) || | |
628 | md_raid1_congested(mddev, bits); | |
629 | } | |
0d129228 | 630 | |
7eaceacc | 631 | static void flush_pending_writes(conf_t *conf) |
a35e63ef N |
632 | { |
633 | /* Any writes that have been queued but are awaiting | |
634 | * bitmap updates get flushed here. | |
a35e63ef | 635 | */ |
a35e63ef N |
636 | spin_lock_irq(&conf->device_lock); |
637 | ||
638 | if (conf->pending_bio_list.head) { | |
639 | struct bio *bio; | |
640 | bio = bio_list_get(&conf->pending_bio_list); | |
a35e63ef N |
641 | spin_unlock_irq(&conf->device_lock); |
642 | /* flush any pending bitmap writes to | |
643 | * disk before proceeding w/ I/O */ | |
644 | bitmap_unplug(conf->mddev->bitmap); | |
645 | ||
646 | while (bio) { /* submit pending writes */ | |
647 | struct bio *next = bio->bi_next; | |
648 | bio->bi_next = NULL; | |
649 | generic_make_request(bio); | |
650 | bio = next; | |
651 | } | |
a35e63ef N |
652 | } else |
653 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
654 | } |
655 | ||
17999be4 N |
656 | /* Barriers.... |
657 | * Sometimes we need to suspend IO while we do something else, | |
658 | * either some resync/recovery, or reconfigure the array. | |
659 | * To do this we raise a 'barrier'. | |
660 | * The 'barrier' is a counter that can be raised multiple times | |
661 | * to count how many activities are happening which preclude | |
662 | * normal IO. | |
663 | * We can only raise the barrier if there is no pending IO. | |
664 | * i.e. if nr_pending == 0. | |
665 | * We choose only to raise the barrier if no-one is waiting for the | |
666 | * barrier to go down. This means that as soon as an IO request | |
667 | * is ready, no other operations which require a barrier will start | |
668 | * until the IO request has had a chance. | |
669 | * | |
670 | * So: regular IO calls 'wait_barrier'. When that returns there | |
671 | * is no backgroup IO happening, It must arrange to call | |
672 | * allow_barrier when it has finished its IO. | |
673 | * backgroup IO calls must call raise_barrier. Once that returns | |
674 | * there is no normal IO happeing. It must arrange to call | |
675 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
676 | */ |
677 | #define RESYNC_DEPTH 32 | |
678 | ||
17999be4 | 679 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
680 | { |
681 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
682 | |
683 | /* Wait until no block IO is waiting */ | |
684 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 685 | conf->resync_lock, ); |
17999be4 N |
686 | |
687 | /* block any new IO from starting */ | |
688 | conf->barrier++; | |
689 | ||
046abeed | 690 | /* Now wait for all pending IO to complete */ |
17999be4 N |
691 | wait_event_lock_irq(conf->wait_barrier, |
692 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 693 | conf->resync_lock, ); |
17999be4 N |
694 | |
695 | spin_unlock_irq(&conf->resync_lock); | |
696 | } | |
697 | ||
698 | static void lower_barrier(conf_t *conf) | |
699 | { | |
700 | unsigned long flags; | |
709ae487 | 701 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
702 | spin_lock_irqsave(&conf->resync_lock, flags); |
703 | conf->barrier--; | |
704 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
705 | wake_up(&conf->wait_barrier); | |
706 | } | |
707 | ||
708 | static void wait_barrier(conf_t *conf) | |
709 | { | |
710 | spin_lock_irq(&conf->resync_lock); | |
711 | if (conf->barrier) { | |
712 | conf->nr_waiting++; | |
713 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
714 | conf->resync_lock, | |
c3b328ac | 715 | ); |
17999be4 | 716 | conf->nr_waiting--; |
1da177e4 | 717 | } |
17999be4 | 718 | conf->nr_pending++; |
1da177e4 LT |
719 | spin_unlock_irq(&conf->resync_lock); |
720 | } | |
721 | ||
17999be4 N |
722 | static void allow_barrier(conf_t *conf) |
723 | { | |
724 | unsigned long flags; | |
725 | spin_lock_irqsave(&conf->resync_lock, flags); | |
726 | conf->nr_pending--; | |
727 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
728 | wake_up(&conf->wait_barrier); | |
729 | } | |
730 | ||
ddaf22ab N |
731 | static void freeze_array(conf_t *conf) |
732 | { | |
733 | /* stop syncio and normal IO and wait for everything to | |
734 | * go quite. | |
735 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
736 | * wait until nr_pending match nr_queued+1 |
737 | * This is called in the context of one normal IO request | |
738 | * that has failed. Thus any sync request that might be pending | |
739 | * will be blocked by nr_pending, and we need to wait for | |
740 | * pending IO requests to complete or be queued for re-try. | |
741 | * Thus the number queued (nr_queued) plus this request (1) | |
742 | * must match the number of pending IOs (nr_pending) before | |
743 | * we continue. | |
ddaf22ab N |
744 | */ |
745 | spin_lock_irq(&conf->resync_lock); | |
746 | conf->barrier++; | |
747 | conf->nr_waiting++; | |
748 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 749 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 750 | conf->resync_lock, |
c3b328ac | 751 | flush_pending_writes(conf)); |
ddaf22ab N |
752 | spin_unlock_irq(&conf->resync_lock); |
753 | } | |
754 | static void unfreeze_array(conf_t *conf) | |
755 | { | |
756 | /* reverse the effect of the freeze */ | |
757 | spin_lock_irq(&conf->resync_lock); | |
758 | conf->barrier--; | |
759 | conf->nr_waiting--; | |
760 | wake_up(&conf->wait_barrier); | |
761 | spin_unlock_irq(&conf->resync_lock); | |
762 | } | |
763 | ||
17999be4 | 764 | |
4e78064f | 765 | /* duplicate the data pages for behind I/O |
4e78064f | 766 | */ |
9f2c9d12 | 767 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
768 | { |
769 | int i; | |
770 | struct bio_vec *bvec; | |
2ca68f5e | 771 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 772 | GFP_NOIO); |
2ca68f5e | 773 | if (unlikely(!bvecs)) |
af6d7b76 | 774 | return; |
4b6d287f | 775 | |
4b6d287f | 776 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
777 | bvecs[i] = *bvec; |
778 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
779 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 780 | goto do_sync_io; |
2ca68f5e N |
781 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
782 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
783 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
784 | kunmap(bvec->bv_page); |
785 | } | |
2ca68f5e | 786 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
787 | r1_bio->behind_page_count = bio->bi_vcnt; |
788 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
789 | return; | |
4b6d287f N |
790 | |
791 | do_sync_io: | |
af6d7b76 | 792 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
793 | if (bvecs[i].bv_page) |
794 | put_page(bvecs[i].bv_page); | |
795 | kfree(bvecs); | |
36a4e1fe | 796 | pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
797 | } |
798 | ||
fd01b88c | 799 | static int make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 800 | { |
070ec55d | 801 | conf_t *conf = mddev->private; |
0f6d02d5 | 802 | struct mirror_info *mirror; |
9f2c9d12 | 803 | struct r1bio *r1_bio; |
1da177e4 | 804 | struct bio *read_bio; |
1f68f0c4 | 805 | int i, disks; |
84255d10 | 806 | struct bitmap *bitmap; |
191ea9b2 | 807 | unsigned long flags; |
a362357b | 808 | const int rw = bio_data_dir(bio); |
2c7d46ec | 809 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 810 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
3cb03002 | 811 | struct md_rdev *blocked_rdev; |
c3b328ac | 812 | int plugged; |
1f68f0c4 N |
813 | int first_clone; |
814 | int sectors_handled; | |
815 | int max_sectors; | |
191ea9b2 | 816 | |
1da177e4 LT |
817 | /* |
818 | * Register the new request and wait if the reconstruction | |
819 | * thread has put up a bar for new requests. | |
820 | * Continue immediately if no resync is active currently. | |
821 | */ | |
62de608d | 822 | |
3d310eb7 N |
823 | md_write_start(mddev, bio); /* wait on superblock update early */ |
824 | ||
6eef4b21 N |
825 | if (bio_data_dir(bio) == WRITE && |
826 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
827 | bio->bi_sector < mddev->suspend_hi) { | |
828 | /* As the suspend_* range is controlled by | |
829 | * userspace, we want an interruptible | |
830 | * wait. | |
831 | */ | |
832 | DEFINE_WAIT(w); | |
833 | for (;;) { | |
834 | flush_signals(current); | |
835 | prepare_to_wait(&conf->wait_barrier, | |
836 | &w, TASK_INTERRUPTIBLE); | |
837 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
838 | bio->bi_sector >= mddev->suspend_hi) | |
839 | break; | |
840 | schedule(); | |
841 | } | |
842 | finish_wait(&conf->wait_barrier, &w); | |
843 | } | |
62de608d | 844 | |
17999be4 | 845 | wait_barrier(conf); |
1da177e4 | 846 | |
84255d10 N |
847 | bitmap = mddev->bitmap; |
848 | ||
1da177e4 LT |
849 | /* |
850 | * make_request() can abort the operation when READA is being | |
851 | * used and no empty request is available. | |
852 | * | |
853 | */ | |
854 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
855 | ||
856 | r1_bio->master_bio = bio; | |
857 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 858 | r1_bio->state = 0; |
1da177e4 LT |
859 | r1_bio->mddev = mddev; |
860 | r1_bio->sector = bio->bi_sector; | |
861 | ||
d2eb35ac N |
862 | /* We might need to issue multiple reads to different |
863 | * devices if there are bad blocks around, so we keep | |
864 | * track of the number of reads in bio->bi_phys_segments. | |
865 | * If this is 0, there is only one r1_bio and no locking | |
866 | * will be needed when requests complete. If it is | |
867 | * non-zero, then it is the number of not-completed requests. | |
868 | */ | |
869 | bio->bi_phys_segments = 0; | |
870 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
871 | ||
a362357b | 872 | if (rw == READ) { |
1da177e4 LT |
873 | /* |
874 | * read balancing logic: | |
875 | */ | |
d2eb35ac N |
876 | int rdisk; |
877 | ||
878 | read_again: | |
879 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
880 | |
881 | if (rdisk < 0) { | |
882 | /* couldn't find anywhere to read from */ | |
883 | raid_end_bio_io(r1_bio); | |
884 | return 0; | |
885 | } | |
886 | mirror = conf->mirrors + rdisk; | |
887 | ||
e555190d N |
888 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
889 | bitmap) { | |
890 | /* Reading from a write-mostly device must | |
891 | * take care not to over-take any writes | |
892 | * that are 'behind' | |
893 | */ | |
894 | wait_event(bitmap->behind_wait, | |
895 | atomic_read(&bitmap->behind_writes) == 0); | |
896 | } | |
1da177e4 LT |
897 | r1_bio->read_disk = rdisk; |
898 | ||
a167f663 | 899 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
900 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
901 | max_sectors); | |
1da177e4 LT |
902 | |
903 | r1_bio->bios[rdisk] = read_bio; | |
904 | ||
905 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
906 | read_bio->bi_bdev = mirror->rdev->bdev; | |
907 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 908 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
909 | read_bio->bi_private = r1_bio; |
910 | ||
d2eb35ac N |
911 | if (max_sectors < r1_bio->sectors) { |
912 | /* could not read all from this device, so we will | |
913 | * need another r1_bio. | |
914 | */ | |
d2eb35ac N |
915 | |
916 | sectors_handled = (r1_bio->sector + max_sectors | |
917 | - bio->bi_sector); | |
918 | r1_bio->sectors = max_sectors; | |
919 | spin_lock_irq(&conf->device_lock); | |
920 | if (bio->bi_phys_segments == 0) | |
921 | bio->bi_phys_segments = 2; | |
922 | else | |
923 | bio->bi_phys_segments++; | |
924 | spin_unlock_irq(&conf->device_lock); | |
925 | /* Cannot call generic_make_request directly | |
926 | * as that will be queued in __make_request | |
927 | * and subsequent mempool_alloc might block waiting | |
928 | * for it. So hand bio over to raid1d. | |
929 | */ | |
930 | reschedule_retry(r1_bio); | |
931 | ||
932 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
933 | ||
934 | r1_bio->master_bio = bio; | |
935 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
936 | r1_bio->state = 0; | |
937 | r1_bio->mddev = mddev; | |
938 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
939 | goto read_again; | |
940 | } else | |
941 | generic_make_request(read_bio); | |
1da177e4 LT |
942 | return 0; |
943 | } | |
944 | ||
945 | /* | |
946 | * WRITE: | |
947 | */ | |
1f68f0c4 | 948 | /* first select target devices under rcu_lock and |
1da177e4 LT |
949 | * inc refcount on their rdev. Record them by setting |
950 | * bios[x] to bio | |
1f68f0c4 N |
951 | * If there are known/acknowledged bad blocks on any device on |
952 | * which we have seen a write error, we want to avoid writing those | |
953 | * blocks. | |
954 | * This potentially requires several writes to write around | |
955 | * the bad blocks. Each set of writes gets it's own r1bio | |
956 | * with a set of bios attached. | |
1da177e4 | 957 | */ |
c3b328ac N |
958 | plugged = mddev_check_plugged(mddev); |
959 | ||
1da177e4 | 960 | disks = conf->raid_disks; |
6bfe0b49 DW |
961 | retry_write: |
962 | blocked_rdev = NULL; | |
1da177e4 | 963 | rcu_read_lock(); |
1f68f0c4 | 964 | max_sectors = r1_bio->sectors; |
1da177e4 | 965 | for (i = 0; i < disks; i++) { |
3cb03002 | 966 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
967 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
968 | atomic_inc(&rdev->nr_pending); | |
969 | blocked_rdev = rdev; | |
970 | break; | |
971 | } | |
1f68f0c4 N |
972 | r1_bio->bios[i] = NULL; |
973 | if (!rdev || test_bit(Faulty, &rdev->flags)) { | |
974 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
975 | continue; | |
976 | } | |
977 | ||
978 | atomic_inc(&rdev->nr_pending); | |
979 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
980 | sector_t first_bad; | |
981 | int bad_sectors; | |
982 | int is_bad; | |
983 | ||
984 | is_bad = is_badblock(rdev, r1_bio->sector, | |
985 | max_sectors, | |
986 | &first_bad, &bad_sectors); | |
987 | if (is_bad < 0) { | |
988 | /* mustn't write here until the bad block is | |
989 | * acknowledged*/ | |
990 | set_bit(BlockedBadBlocks, &rdev->flags); | |
991 | blocked_rdev = rdev; | |
992 | break; | |
993 | } | |
994 | if (is_bad && first_bad <= r1_bio->sector) { | |
995 | /* Cannot write here at all */ | |
996 | bad_sectors -= (r1_bio->sector - first_bad); | |
997 | if (bad_sectors < max_sectors) | |
998 | /* mustn't write more than bad_sectors | |
999 | * to other devices yet | |
1000 | */ | |
1001 | max_sectors = bad_sectors; | |
03c902e1 | 1002 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1003 | /* We don't set R1BIO_Degraded as that |
1004 | * only applies if the disk is | |
1005 | * missing, so it might be re-added, | |
1006 | * and we want to know to recover this | |
1007 | * chunk. | |
1008 | * In this case the device is here, | |
1009 | * and the fact that this chunk is not | |
1010 | * in-sync is recorded in the bad | |
1011 | * block log | |
1012 | */ | |
1013 | continue; | |
964147d5 | 1014 | } |
1f68f0c4 N |
1015 | if (is_bad) { |
1016 | int good_sectors = first_bad - r1_bio->sector; | |
1017 | if (good_sectors < max_sectors) | |
1018 | max_sectors = good_sectors; | |
1019 | } | |
1020 | } | |
1021 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1022 | } |
1023 | rcu_read_unlock(); | |
1024 | ||
6bfe0b49 DW |
1025 | if (unlikely(blocked_rdev)) { |
1026 | /* Wait for this device to become unblocked */ | |
1027 | int j; | |
1028 | ||
1029 | for (j = 0; j < i; j++) | |
1030 | if (r1_bio->bios[j]) | |
1031 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1032 | r1_bio->state = 0; |
6bfe0b49 DW |
1033 | allow_barrier(conf); |
1034 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1035 | wait_barrier(conf); | |
1036 | goto retry_write; | |
1037 | } | |
1038 | ||
1f68f0c4 N |
1039 | if (max_sectors < r1_bio->sectors) { |
1040 | /* We are splitting this write into multiple parts, so | |
1041 | * we need to prepare for allocating another r1_bio. | |
1042 | */ | |
1043 | r1_bio->sectors = max_sectors; | |
1044 | spin_lock_irq(&conf->device_lock); | |
1045 | if (bio->bi_phys_segments == 0) | |
1046 | bio->bi_phys_segments = 2; | |
1047 | else | |
1048 | bio->bi_phys_segments++; | |
1049 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1050 | } |
1f68f0c4 | 1051 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1052 | |
4e78064f | 1053 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1054 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1055 | |
1f68f0c4 | 1056 | first_clone = 1; |
1da177e4 LT |
1057 | for (i = 0; i < disks; i++) { |
1058 | struct bio *mbio; | |
1059 | if (!r1_bio->bios[i]) | |
1060 | continue; | |
1061 | ||
a167f663 | 1062 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1063 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1064 | ||
1065 | if (first_clone) { | |
1066 | /* do behind I/O ? | |
1067 | * Not if there are too many, or cannot | |
1068 | * allocate memory, or a reader on WriteMostly | |
1069 | * is waiting for behind writes to flush */ | |
1070 | if (bitmap && | |
1071 | (atomic_read(&bitmap->behind_writes) | |
1072 | < mddev->bitmap_info.max_write_behind) && | |
1073 | !waitqueue_active(&bitmap->behind_wait)) | |
1074 | alloc_behind_pages(mbio, r1_bio); | |
1075 | ||
1076 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1077 | r1_bio->sectors, | |
1078 | test_bit(R1BIO_BehindIO, | |
1079 | &r1_bio->state)); | |
1080 | first_clone = 0; | |
1081 | } | |
2ca68f5e | 1082 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1083 | struct bio_vec *bvec; |
1084 | int j; | |
1085 | ||
1086 | /* Yes, I really want the '__' version so that | |
1087 | * we clear any unused pointer in the io_vec, rather | |
1088 | * than leave them unchanged. This is important | |
1089 | * because when we come to free the pages, we won't | |
046abeed | 1090 | * know the original bi_idx, so we just free |
4b6d287f N |
1091 | * them all |
1092 | */ | |
1093 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1094 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1095 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1096 | atomic_inc(&r1_bio->behind_remaining); | |
1097 | } | |
1098 | ||
1f68f0c4 N |
1099 | r1_bio->bios[i] = mbio; |
1100 | ||
1101 | mbio->bi_sector = (r1_bio->sector + | |
1102 | conf->mirrors[i].rdev->data_offset); | |
1103 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1104 | mbio->bi_end_io = raid1_end_write_request; | |
1105 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; | |
1106 | mbio->bi_private = r1_bio; | |
1107 | ||
1da177e4 | 1108 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
1109 | spin_lock_irqsave(&conf->device_lock, flags); |
1110 | bio_list_add(&conf->pending_bio_list, mbio); | |
4e78064f | 1111 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1112 | } |
079fa166 N |
1113 | /* Mustn't call r1_bio_write_done before this next test, |
1114 | * as it could result in the bio being freed. | |
1115 | */ | |
1f68f0c4 | 1116 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1117 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1118 | /* We need another r1_bio. It has already been counted |
1119 | * in bio->bi_phys_segments | |
1120 | */ | |
1121 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1122 | r1_bio->master_bio = bio; | |
1123 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1124 | r1_bio->state = 0; | |
1125 | r1_bio->mddev = mddev; | |
1126 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1127 | goto retry_write; | |
1128 | } | |
1129 | ||
079fa166 N |
1130 | r1_bio_write_done(r1_bio); |
1131 | ||
1132 | /* In case raid1d snuck in to freeze_array */ | |
1133 | wake_up(&conf->wait_barrier); | |
1134 | ||
c3b328ac | 1135 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 1136 | md_wakeup_thread(mddev->thread); |
191ea9b2 | 1137 | |
1da177e4 LT |
1138 | return 0; |
1139 | } | |
1140 | ||
fd01b88c | 1141 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1142 | { |
070ec55d | 1143 | conf_t *conf = mddev->private; |
1da177e4 LT |
1144 | int i; |
1145 | ||
1146 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1147 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1148 | rcu_read_lock(); |
1149 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1150 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1151 | seq_printf(seq, "%s", |
ddac7c7e N |
1152 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1153 | } | |
1154 | rcu_read_unlock(); | |
1da177e4 LT |
1155 | seq_printf(seq, "]"); |
1156 | } | |
1157 | ||
1158 | ||
fd01b88c | 1159 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1160 | { |
1161 | char b[BDEVNAME_SIZE]; | |
070ec55d | 1162 | conf_t *conf = mddev->private; |
1da177e4 LT |
1163 | |
1164 | /* | |
1165 | * If it is not operational, then we have already marked it as dead | |
1166 | * else if it is the last working disks, ignore the error, let the | |
1167 | * next level up know. | |
1168 | * else mark the drive as failed | |
1169 | */ | |
b2d444d7 | 1170 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1171 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1172 | /* |
1173 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1174 | * normal single drive. |
1175 | * However don't try a recovery from this drive as | |
1176 | * it is very likely to fail. | |
1da177e4 | 1177 | */ |
5389042f | 1178 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1179 | return; |
4044ba58 | 1180 | } |
de393cde | 1181 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1182 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1183 | unsigned long flags; | |
1184 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1185 | mddev->degraded++; |
dd00a99e | 1186 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1187 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1188 | /* |
1189 | * if recovery is running, make sure it aborts. | |
1190 | */ | |
dfc70645 | 1191 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1192 | } else |
1193 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1194 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1195 | printk(KERN_ALERT |
1196 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1197 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1198 | mdname(mddev), bdevname(rdev->bdev, b), |
1199 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | static void print_conf(conf_t *conf) | |
1203 | { | |
1204 | int i; | |
1da177e4 | 1205 | |
9dd1e2fa | 1206 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1207 | if (!conf) { |
9dd1e2fa | 1208 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1209 | return; |
1210 | } | |
9dd1e2fa | 1211 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1212 | conf->raid_disks); |
1213 | ||
ddac7c7e | 1214 | rcu_read_lock(); |
1da177e4 LT |
1215 | for (i = 0; i < conf->raid_disks; i++) { |
1216 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1217 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1218 | if (rdev) |
9dd1e2fa | 1219 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1220 | i, !test_bit(In_sync, &rdev->flags), |
1221 | !test_bit(Faulty, &rdev->flags), | |
1222 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1223 | } |
ddac7c7e | 1224 | rcu_read_unlock(); |
1da177e4 LT |
1225 | } |
1226 | ||
1227 | static void close_sync(conf_t *conf) | |
1228 | { | |
17999be4 N |
1229 | wait_barrier(conf); |
1230 | allow_barrier(conf); | |
1da177e4 LT |
1231 | |
1232 | mempool_destroy(conf->r1buf_pool); | |
1233 | conf->r1buf_pool = NULL; | |
1234 | } | |
1235 | ||
fd01b88c | 1236 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1237 | { |
1238 | int i; | |
1239 | conf_t *conf = mddev->private; | |
6b965620 N |
1240 | int count = 0; |
1241 | unsigned long flags; | |
1da177e4 LT |
1242 | |
1243 | /* | |
1244 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1245 | * and mark them readable. |
1246 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1247 | */ |
1248 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1249 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
ddac7c7e N |
1250 | if (rdev |
1251 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1252 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1253 | count++; |
654e8b5a | 1254 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1255 | } |
1256 | } | |
6b965620 N |
1257 | spin_lock_irqsave(&conf->device_lock, flags); |
1258 | mddev->degraded -= count; | |
1259 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1260 | |
1261 | print_conf(conf); | |
6b965620 | 1262 | return count; |
1da177e4 LT |
1263 | } |
1264 | ||
1265 | ||
fd01b88c | 1266 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1267 | { |
1268 | conf_t *conf = mddev->private; | |
199050ea | 1269 | int err = -EEXIST; |
41158c7e | 1270 | int mirror = 0; |
0f6d02d5 | 1271 | struct mirror_info *p; |
6c2fce2e NB |
1272 | int first = 0; |
1273 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1274 | |
5389042f N |
1275 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1276 | return -EBUSY; | |
1277 | ||
6c2fce2e NB |
1278 | if (rdev->raid_disk >= 0) |
1279 | first = last = rdev->raid_disk; | |
1280 | ||
1281 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1282 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1283 | ||
8f6c2e4b MP |
1284 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1285 | rdev->data_offset << 9); | |
627a2d3c N |
1286 | /* as we don't honour merge_bvec_fn, we must |
1287 | * never risk violating it, so limit | |
1288 | * ->max_segments to one lying with a single | |
1289 | * page, as a one page request is never in | |
1290 | * violation. | |
1da177e4 | 1291 | */ |
627a2d3c N |
1292 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1293 | blk_queue_max_segments(mddev->queue, 1); | |
1294 | blk_queue_segment_boundary(mddev->queue, | |
1295 | PAGE_CACHE_SIZE - 1); | |
1296 | } | |
1da177e4 LT |
1297 | |
1298 | p->head_position = 0; | |
1299 | rdev->raid_disk = mirror; | |
199050ea | 1300 | err = 0; |
6aea114a N |
1301 | /* As all devices are equivalent, we don't need a full recovery |
1302 | * if this was recently any drive of the array | |
1303 | */ | |
1304 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1305 | conf->fullsync = 1; |
d6065f7b | 1306 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1307 | break; |
1308 | } | |
ac5e7113 | 1309 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1310 | print_conf(conf); |
199050ea | 1311 | return err; |
1da177e4 LT |
1312 | } |
1313 | ||
fd01b88c | 1314 | static int raid1_remove_disk(struct mddev *mddev, int number) |
1da177e4 LT |
1315 | { |
1316 | conf_t *conf = mddev->private; | |
1317 | int err = 0; | |
3cb03002 | 1318 | struct md_rdev *rdev; |
0f6d02d5 | 1319 | struct mirror_info *p = conf->mirrors+ number; |
1da177e4 LT |
1320 | |
1321 | print_conf(conf); | |
1322 | rdev = p->rdev; | |
1323 | if (rdev) { | |
b2d444d7 | 1324 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1325 | atomic_read(&rdev->nr_pending)) { |
1326 | err = -EBUSY; | |
1327 | goto abort; | |
1328 | } | |
046abeed | 1329 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1330 | * is not possible. |
1331 | */ | |
1332 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1333 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1334 | mddev->degraded < conf->raid_disks) { |
1335 | err = -EBUSY; | |
1336 | goto abort; | |
1337 | } | |
1da177e4 | 1338 | p->rdev = NULL; |
fbd568a3 | 1339 | synchronize_rcu(); |
1da177e4 LT |
1340 | if (atomic_read(&rdev->nr_pending)) { |
1341 | /* lost the race, try later */ | |
1342 | err = -EBUSY; | |
1343 | p->rdev = rdev; | |
ac5e7113 | 1344 | goto abort; |
1da177e4 | 1345 | } |
a91a2785 | 1346 | err = md_integrity_register(mddev); |
1da177e4 LT |
1347 | } |
1348 | abort: | |
1349 | ||
1350 | print_conf(conf); | |
1351 | return err; | |
1352 | } | |
1353 | ||
1354 | ||
6712ecf8 | 1355 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1356 | { |
9f2c9d12 | 1357 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1358 | |
0fc280f6 | 1359 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1360 | |
1da177e4 LT |
1361 | /* |
1362 | * we have read a block, now it needs to be re-written, | |
1363 | * or re-read if the read failed. | |
1364 | * We don't do much here, just schedule handling by raid1d | |
1365 | */ | |
69382e85 | 1366 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1367 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1368 | |
1369 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1370 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1371 | } |
1372 | ||
6712ecf8 | 1373 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1374 | { |
1375 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1376 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1377 | struct mddev *mddev = r1_bio->mddev; |
070ec55d | 1378 | conf_t *conf = mddev->private; |
1da177e4 | 1379 | int mirror=0; |
4367af55 N |
1380 | sector_t first_bad; |
1381 | int bad_sectors; | |
1da177e4 | 1382 | |
ba3ae3be NK |
1383 | mirror = find_bio_disk(r1_bio, bio); |
1384 | ||
6b1117d5 | 1385 | if (!uptodate) { |
57dab0bd | 1386 | sector_t sync_blocks = 0; |
6b1117d5 N |
1387 | sector_t s = r1_bio->sector; |
1388 | long sectors_to_go = r1_bio->sectors; | |
1389 | /* make sure these bits doesn't get cleared. */ | |
1390 | do { | |
5e3db645 | 1391 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1392 | &sync_blocks, 1); |
1393 | s += sync_blocks; | |
1394 | sectors_to_go -= sync_blocks; | |
1395 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1396 | set_bit(WriteErrorSeen, |
1397 | &conf->mirrors[mirror].rdev->flags); | |
1398 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 N |
1399 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1400 | r1_bio->sector, | |
1401 | r1_bio->sectors, | |
3a9f28a5 N |
1402 | &first_bad, &bad_sectors) && |
1403 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1404 | r1_bio->sector, | |
1405 | r1_bio->sectors, | |
1406 | &first_bad, &bad_sectors) | |
1407 | ) | |
4367af55 | 1408 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1409 | |
1da177e4 | 1410 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1411 | int s = r1_bio->sectors; |
d8f05d29 N |
1412 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1413 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1414 | reschedule_retry(r1_bio); |
1415 | else { | |
1416 | put_buf(r1_bio); | |
1417 | md_done_sync(mddev, s, uptodate); | |
1418 | } | |
1da177e4 | 1419 | } |
1da177e4 LT |
1420 | } |
1421 | ||
3cb03002 | 1422 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1423 | int sectors, struct page *page, int rw) |
1424 | { | |
1425 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1426 | /* success */ | |
1427 | return 1; | |
1428 | if (rw == WRITE) | |
1429 | set_bit(WriteErrorSeen, &rdev->flags); | |
1430 | /* need to record an error - either for the block or the device */ | |
1431 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1432 | md_error(rdev->mddev, rdev); | |
1433 | return 0; | |
1434 | } | |
1435 | ||
9f2c9d12 | 1436 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1437 | { |
a68e5870 N |
1438 | /* Try some synchronous reads of other devices to get |
1439 | * good data, much like with normal read errors. Only | |
1440 | * read into the pages we already have so we don't | |
1441 | * need to re-issue the read request. | |
1442 | * We don't need to freeze the array, because being in an | |
1443 | * active sync request, there is no normal IO, and | |
1444 | * no overlapping syncs. | |
06f60385 N |
1445 | * We don't need to check is_badblock() again as we |
1446 | * made sure that anything with a bad block in range | |
1447 | * will have bi_end_io clear. | |
a68e5870 | 1448 | */ |
fd01b88c | 1449 | struct mddev *mddev = r1_bio->mddev; |
070ec55d | 1450 | conf_t *conf = mddev->private; |
a68e5870 N |
1451 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1452 | sector_t sect = r1_bio->sector; | |
1453 | int sectors = r1_bio->sectors; | |
1454 | int idx = 0; | |
1455 | ||
1456 | while(sectors) { | |
1457 | int s = sectors; | |
1458 | int d = r1_bio->read_disk; | |
1459 | int success = 0; | |
3cb03002 | 1460 | struct md_rdev *rdev; |
78d7f5f7 | 1461 | int start; |
a68e5870 N |
1462 | |
1463 | if (s > (PAGE_SIZE>>9)) | |
1464 | s = PAGE_SIZE >> 9; | |
1465 | do { | |
1466 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1467 | /* No rcu protection needed here devices | |
1468 | * can only be removed when no resync is | |
1469 | * active, and resync is currently active | |
1470 | */ | |
1471 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1472 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1473 | bio->bi_io_vec[idx].bv_page, |
1474 | READ, false)) { | |
1475 | success = 1; | |
1476 | break; | |
1477 | } | |
1478 | } | |
1479 | d++; | |
1480 | if (d == conf->raid_disks) | |
1481 | d = 0; | |
1482 | } while (!success && d != r1_bio->read_disk); | |
1483 | ||
78d7f5f7 | 1484 | if (!success) { |
a68e5870 | 1485 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1486 | int abort = 0; |
1487 | /* Cannot read from anywhere, this block is lost. | |
1488 | * Record a bad block on each device. If that doesn't | |
1489 | * work just disable and interrupt the recovery. | |
1490 | * Don't fail devices as that won't really help. | |
1491 | */ | |
a68e5870 N |
1492 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1493 | " for block %llu\n", | |
1494 | mdname(mddev), | |
1495 | bdevname(bio->bi_bdev, b), | |
1496 | (unsigned long long)r1_bio->sector); | |
3a9f28a5 N |
1497 | for (d = 0; d < conf->raid_disks; d++) { |
1498 | rdev = conf->mirrors[d].rdev; | |
1499 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1500 | continue; | |
1501 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1502 | abort = 1; | |
1503 | } | |
1504 | if (abort) { | |
1505 | mddev->recovery_disabled = 1; | |
1506 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1507 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1508 | put_buf(r1_bio); | |
1509 | return 0; | |
1510 | } | |
1511 | /* Try next page */ | |
1512 | sectors -= s; | |
1513 | sect += s; | |
1514 | idx++; | |
1515 | continue; | |
d11c171e | 1516 | } |
78d7f5f7 N |
1517 | |
1518 | start = d; | |
1519 | /* write it back and re-read */ | |
1520 | while (d != r1_bio->read_disk) { | |
1521 | if (d == 0) | |
1522 | d = conf->raid_disks; | |
1523 | d--; | |
1524 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1525 | continue; | |
1526 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1527 | if (r1_sync_page_io(rdev, sect, s, |
1528 | bio->bi_io_vec[idx].bv_page, | |
1529 | WRITE) == 0) { | |
78d7f5f7 N |
1530 | r1_bio->bios[d]->bi_end_io = NULL; |
1531 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1532 | } |
78d7f5f7 N |
1533 | } |
1534 | d = start; | |
1535 | while (d != r1_bio->read_disk) { | |
1536 | if (d == 0) | |
1537 | d = conf->raid_disks; | |
1538 | d--; | |
1539 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1540 | continue; | |
1541 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1542 | if (r1_sync_page_io(rdev, sect, s, |
1543 | bio->bi_io_vec[idx].bv_page, | |
1544 | READ) != 0) | |
9d3d8011 | 1545 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1546 | } |
a68e5870 N |
1547 | sectors -= s; |
1548 | sect += s; | |
1549 | idx ++; | |
1550 | } | |
78d7f5f7 | 1551 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1552 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1553 | return 1; |
1554 | } | |
1555 | ||
9f2c9d12 | 1556 | static int process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1557 | { |
1558 | /* We have read all readable devices. If we haven't | |
1559 | * got the block, then there is no hope left. | |
1560 | * If we have, then we want to do a comparison | |
1561 | * and skip the write if everything is the same. | |
1562 | * If any blocks failed to read, then we need to | |
1563 | * attempt an over-write | |
1564 | */ | |
fd01b88c | 1565 | struct mddev *mddev = r1_bio->mddev; |
a68e5870 N |
1566 | conf_t *conf = mddev->private; |
1567 | int primary; | |
1568 | int i; | |
1569 | ||
78d7f5f7 | 1570 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1571 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1572 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1573 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1574 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1575 | break; | |
1576 | } | |
1577 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1578 | for (i = 0; i < conf->raid_disks; i++) { |
1579 | int j; | |
1580 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1581 | struct bio *pbio = r1_bio->bios[primary]; | |
1582 | struct bio *sbio = r1_bio->bios[i]; | |
1583 | int size; | |
a68e5870 | 1584 | |
78d7f5f7 N |
1585 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1586 | continue; | |
1587 | ||
1588 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1589 | for (j = vcnt; j-- ; ) { | |
1590 | struct page *p, *s; | |
1591 | p = pbio->bi_io_vec[j].bv_page; | |
1592 | s = sbio->bi_io_vec[j].bv_page; | |
1593 | if (memcmp(page_address(p), | |
1594 | page_address(s), | |
1595 | PAGE_SIZE)) | |
1596 | break; | |
69382e85 | 1597 | } |
78d7f5f7 N |
1598 | } else |
1599 | j = 0; | |
1600 | if (j >= 0) | |
1601 | mddev->resync_mismatches += r1_bio->sectors; | |
1602 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1603 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1604 | /* No need to write to this device. */ | |
1605 | sbio->bi_end_io = NULL; | |
1606 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1607 | continue; | |
1608 | } | |
1609 | /* fixup the bio for reuse */ | |
1610 | sbio->bi_vcnt = vcnt; | |
1611 | sbio->bi_size = r1_bio->sectors << 9; | |
1612 | sbio->bi_idx = 0; | |
1613 | sbio->bi_phys_segments = 0; | |
1614 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1615 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1616 | sbio->bi_next = NULL; | |
1617 | sbio->bi_sector = r1_bio->sector + | |
1618 | conf->mirrors[i].rdev->data_offset; | |
1619 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1620 | size = sbio->bi_size; | |
1621 | for (j = 0; j < vcnt ; j++) { | |
1622 | struct bio_vec *bi; | |
1623 | bi = &sbio->bi_io_vec[j]; | |
1624 | bi->bv_offset = 0; | |
1625 | if (size > PAGE_SIZE) | |
1626 | bi->bv_len = PAGE_SIZE; | |
1627 | else | |
1628 | bi->bv_len = size; | |
1629 | size -= PAGE_SIZE; | |
1630 | memcpy(page_address(bi->bv_page), | |
1631 | page_address(pbio->bi_io_vec[j].bv_page), | |
1632 | PAGE_SIZE); | |
69382e85 | 1633 | } |
78d7f5f7 | 1634 | } |
a68e5870 N |
1635 | return 0; |
1636 | } | |
1637 | ||
9f2c9d12 | 1638 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 N |
1639 | { |
1640 | conf_t *conf = mddev->private; | |
1641 | int i; | |
1642 | int disks = conf->raid_disks; | |
1643 | struct bio *bio, *wbio; | |
1644 | ||
1645 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1646 | ||
a68e5870 N |
1647 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1648 | /* ouch - failed to read all of that. */ | |
1649 | if (!fix_sync_read_error(r1_bio)) | |
1650 | return; | |
7ca78d57 N |
1651 | |
1652 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1653 | if (process_checks(r1_bio) < 0) | |
1654 | return; | |
d11c171e N |
1655 | /* |
1656 | * schedule writes | |
1657 | */ | |
1da177e4 LT |
1658 | atomic_set(&r1_bio->remaining, 1); |
1659 | for (i = 0; i < disks ; i++) { | |
1660 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1661 | if (wbio->bi_end_io == NULL || |
1662 | (wbio->bi_end_io == end_sync_read && | |
1663 | (i == r1_bio->read_disk || | |
1664 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1665 | continue; |
1666 | ||
3e198f78 N |
1667 | wbio->bi_rw = WRITE; |
1668 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1669 | atomic_inc(&r1_bio->remaining); |
1670 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1671 | |
1da177e4 LT |
1672 | generic_make_request(wbio); |
1673 | } | |
1674 | ||
1675 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1676 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1677 | md_done_sync(mddev, r1_bio->sectors, 1); |
1678 | put_buf(r1_bio); | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * This is a kernel thread which: | |
1684 | * | |
1685 | * 1. Retries failed read operations on working mirrors. | |
1686 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1687 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1688 | */ |
1689 | ||
867868fb N |
1690 | static void fix_read_error(conf_t *conf, int read_disk, |
1691 | sector_t sect, int sectors) | |
1692 | { | |
fd01b88c | 1693 | struct mddev *mddev = conf->mddev; |
867868fb N |
1694 | while(sectors) { |
1695 | int s = sectors; | |
1696 | int d = read_disk; | |
1697 | int success = 0; | |
1698 | int start; | |
3cb03002 | 1699 | struct md_rdev *rdev; |
867868fb N |
1700 | |
1701 | if (s > (PAGE_SIZE>>9)) | |
1702 | s = PAGE_SIZE >> 9; | |
1703 | ||
1704 | do { | |
1705 | /* Note: no rcu protection needed here | |
1706 | * as this is synchronous in the raid1d thread | |
1707 | * which is the thread that might remove | |
1708 | * a device. If raid1d ever becomes multi-threaded.... | |
1709 | */ | |
d2eb35ac N |
1710 | sector_t first_bad; |
1711 | int bad_sectors; | |
1712 | ||
867868fb N |
1713 | rdev = conf->mirrors[d].rdev; |
1714 | if (rdev && | |
1715 | test_bit(In_sync, &rdev->flags) && | |
d2eb35ac N |
1716 | is_badblock(rdev, sect, s, |
1717 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
1718 | sync_page_io(rdev, sect, s<<9, |
1719 | conf->tmppage, READ, false)) | |
867868fb N |
1720 | success = 1; |
1721 | else { | |
1722 | d++; | |
1723 | if (d == conf->raid_disks) | |
1724 | d = 0; | |
1725 | } | |
1726 | } while (!success && d != read_disk); | |
1727 | ||
1728 | if (!success) { | |
d8f05d29 | 1729 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 1730 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
1731 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
1732 | md_error(mddev, rdev); | |
867868fb N |
1733 | break; |
1734 | } | |
1735 | /* write it back and re-read */ | |
1736 | start = d; | |
1737 | while (d != read_disk) { | |
1738 | if (d==0) | |
1739 | d = conf->raid_disks; | |
1740 | d--; | |
1741 | rdev = conf->mirrors[d].rdev; | |
1742 | if (rdev && | |
d8f05d29 N |
1743 | test_bit(In_sync, &rdev->flags)) |
1744 | r1_sync_page_io(rdev, sect, s, | |
1745 | conf->tmppage, WRITE); | |
867868fb N |
1746 | } |
1747 | d = start; | |
1748 | while (d != read_disk) { | |
1749 | char b[BDEVNAME_SIZE]; | |
1750 | if (d==0) | |
1751 | d = conf->raid_disks; | |
1752 | d--; | |
1753 | rdev = conf->mirrors[d].rdev; | |
1754 | if (rdev && | |
1755 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
1756 | if (r1_sync_page_io(rdev, sect, s, |
1757 | conf->tmppage, READ)) { | |
867868fb N |
1758 | atomic_add(s, &rdev->corrected_errors); |
1759 | printk(KERN_INFO | |
9dd1e2fa | 1760 | "md/raid1:%s: read error corrected " |
867868fb N |
1761 | "(%d sectors at %llu on %s)\n", |
1762 | mdname(mddev), s, | |
969b755a RD |
1763 | (unsigned long long)(sect + |
1764 | rdev->data_offset), | |
867868fb N |
1765 | bdevname(rdev->bdev, b)); |
1766 | } | |
1767 | } | |
1768 | } | |
1769 | sectors -= s; | |
1770 | sect += s; | |
1771 | } | |
1772 | } | |
1773 | ||
cd5ff9a1 N |
1774 | static void bi_complete(struct bio *bio, int error) |
1775 | { | |
1776 | complete((struct completion *)bio->bi_private); | |
1777 | } | |
1778 | ||
1779 | static int submit_bio_wait(int rw, struct bio *bio) | |
1780 | { | |
1781 | struct completion event; | |
1782 | rw |= REQ_SYNC; | |
1783 | ||
1784 | init_completion(&event); | |
1785 | bio->bi_private = &event; | |
1786 | bio->bi_end_io = bi_complete; | |
1787 | submit_bio(rw, bio); | |
1788 | wait_for_completion(&event); | |
1789 | ||
1790 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1791 | } | |
1792 | ||
9f2c9d12 | 1793 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 1794 | { |
fd01b88c | 1795 | struct mddev *mddev = r1_bio->mddev; |
cd5ff9a1 | 1796 | conf_t *conf = mddev->private; |
3cb03002 | 1797 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
1798 | int vcnt, idx; |
1799 | struct bio_vec *vec; | |
1800 | ||
1801 | /* bio has the data to be written to device 'i' where | |
1802 | * we just recently had a write error. | |
1803 | * We repeatedly clone the bio and trim down to one block, | |
1804 | * then try the write. Where the write fails we record | |
1805 | * a bad block. | |
1806 | * It is conceivable that the bio doesn't exactly align with | |
1807 | * blocks. We must handle this somehow. | |
1808 | * | |
1809 | * We currently own a reference on the rdev. | |
1810 | */ | |
1811 | ||
1812 | int block_sectors; | |
1813 | sector_t sector; | |
1814 | int sectors; | |
1815 | int sect_to_write = r1_bio->sectors; | |
1816 | int ok = 1; | |
1817 | ||
1818 | if (rdev->badblocks.shift < 0) | |
1819 | return 0; | |
1820 | ||
1821 | block_sectors = 1 << rdev->badblocks.shift; | |
1822 | sector = r1_bio->sector; | |
1823 | sectors = ((sector + block_sectors) | |
1824 | & ~(sector_t)(block_sectors - 1)) | |
1825 | - sector; | |
1826 | ||
1827 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
1828 | vcnt = r1_bio->behind_page_count; | |
1829 | vec = r1_bio->behind_bvecs; | |
1830 | idx = 0; | |
1831 | while (vec[idx].bv_page == NULL) | |
1832 | idx++; | |
1833 | } else { | |
1834 | vcnt = r1_bio->master_bio->bi_vcnt; | |
1835 | vec = r1_bio->master_bio->bi_io_vec; | |
1836 | idx = r1_bio->master_bio->bi_idx; | |
1837 | } | |
1838 | while (sect_to_write) { | |
1839 | struct bio *wbio; | |
1840 | if (sectors > sect_to_write) | |
1841 | sectors = sect_to_write; | |
1842 | /* Write at 'sector' for 'sectors'*/ | |
1843 | ||
1844 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
1845 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
1846 | wbio->bi_sector = r1_bio->sector; | |
1847 | wbio->bi_rw = WRITE; | |
1848 | wbio->bi_vcnt = vcnt; | |
1849 | wbio->bi_size = r1_bio->sectors << 9; | |
1850 | wbio->bi_idx = idx; | |
1851 | ||
1852 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
1853 | wbio->bi_sector += rdev->data_offset; | |
1854 | wbio->bi_bdev = rdev->bdev; | |
1855 | if (submit_bio_wait(WRITE, wbio) == 0) | |
1856 | /* failure! */ | |
1857 | ok = rdev_set_badblocks(rdev, sector, | |
1858 | sectors, 0) | |
1859 | && ok; | |
1860 | ||
1861 | bio_put(wbio); | |
1862 | sect_to_write -= sectors; | |
1863 | sector += sectors; | |
1864 | sectors = block_sectors; | |
1865 | } | |
1866 | return ok; | |
1867 | } | |
1868 | ||
9f2c9d12 | 1869 | static void handle_sync_write_finished(conf_t *conf, struct r1bio *r1_bio) |
62096bce N |
1870 | { |
1871 | int m; | |
1872 | int s = r1_bio->sectors; | |
1873 | for (m = 0; m < conf->raid_disks ; m++) { | |
3cb03002 | 1874 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
1875 | struct bio *bio = r1_bio->bios[m]; |
1876 | if (bio->bi_end_io == NULL) | |
1877 | continue; | |
1878 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1879 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
1880 | rdev_clear_badblocks(rdev, r1_bio->sector, s); | |
1881 | } | |
1882 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1883 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
1884 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
1885 | md_error(conf->mddev, rdev); | |
1886 | } | |
1887 | } | |
1888 | put_buf(r1_bio); | |
1889 | md_done_sync(conf->mddev, s, 1); | |
1890 | } | |
1891 | ||
9f2c9d12 | 1892 | static void handle_write_finished(conf_t *conf, struct r1bio *r1_bio) |
62096bce N |
1893 | { |
1894 | int m; | |
1895 | for (m = 0; m < conf->raid_disks ; m++) | |
1896 | if (r1_bio->bios[m] == IO_MADE_GOOD) { | |
3cb03002 | 1897 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
1898 | rdev_clear_badblocks(rdev, |
1899 | r1_bio->sector, | |
1900 | r1_bio->sectors); | |
1901 | rdev_dec_pending(rdev, conf->mddev); | |
1902 | } else if (r1_bio->bios[m] != NULL) { | |
1903 | /* This drive got a write error. We need to | |
1904 | * narrow down and record precise write | |
1905 | * errors. | |
1906 | */ | |
1907 | if (!narrow_write_error(r1_bio, m)) { | |
1908 | md_error(conf->mddev, | |
1909 | conf->mirrors[m].rdev); | |
1910 | /* an I/O failed, we can't clear the bitmap */ | |
1911 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1912 | } | |
1913 | rdev_dec_pending(conf->mirrors[m].rdev, | |
1914 | conf->mddev); | |
1915 | } | |
1916 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1917 | close_write(r1_bio); | |
1918 | raid_end_bio_io(r1_bio); | |
1919 | } | |
1920 | ||
9f2c9d12 | 1921 | static void handle_read_error(conf_t *conf, struct r1bio *r1_bio) |
62096bce N |
1922 | { |
1923 | int disk; | |
1924 | int max_sectors; | |
fd01b88c | 1925 | struct mddev *mddev = conf->mddev; |
62096bce N |
1926 | struct bio *bio; |
1927 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1928 | struct md_rdev *rdev; |
62096bce N |
1929 | |
1930 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
1931 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1932 | * the block and we can fix it. | |
1933 | * We freeze all other IO, and try reading the block from | |
1934 | * other devices. When we find one, we re-write | |
1935 | * and check it that fixes the read error. | |
1936 | * This is all done synchronously while the array is | |
1937 | * frozen | |
1938 | */ | |
1939 | if (mddev->ro == 0) { | |
1940 | freeze_array(conf); | |
1941 | fix_read_error(conf, r1_bio->read_disk, | |
1942 | r1_bio->sector, r1_bio->sectors); | |
1943 | unfreeze_array(conf); | |
1944 | } else | |
1945 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1946 | ||
1947 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1948 | bdevname(bio->bi_bdev, b); | |
1949 | read_more: | |
1950 | disk = read_balance(conf, r1_bio, &max_sectors); | |
1951 | if (disk == -1) { | |
1952 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
1953 | " read error for block %llu\n", | |
1954 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
1955 | raid_end_bio_io(r1_bio); | |
1956 | } else { | |
1957 | const unsigned long do_sync | |
1958 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
1959 | if (bio) { | |
1960 | r1_bio->bios[r1_bio->read_disk] = | |
1961 | mddev->ro ? IO_BLOCKED : NULL; | |
1962 | bio_put(bio); | |
1963 | } | |
1964 | r1_bio->read_disk = disk; | |
1965 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
1966 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
1967 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1968 | rdev = conf->mirrors[disk].rdev; | |
1969 | printk_ratelimited(KERN_ERR | |
1970 | "md/raid1:%s: redirecting sector %llu" | |
1971 | " to other mirror: %s\n", | |
1972 | mdname(mddev), | |
1973 | (unsigned long long)r1_bio->sector, | |
1974 | bdevname(rdev->bdev, b)); | |
1975 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1976 | bio->bi_bdev = rdev->bdev; | |
1977 | bio->bi_end_io = raid1_end_read_request; | |
1978 | bio->bi_rw = READ | do_sync; | |
1979 | bio->bi_private = r1_bio; | |
1980 | if (max_sectors < r1_bio->sectors) { | |
1981 | /* Drat - have to split this up more */ | |
1982 | struct bio *mbio = r1_bio->master_bio; | |
1983 | int sectors_handled = (r1_bio->sector + max_sectors | |
1984 | - mbio->bi_sector); | |
1985 | r1_bio->sectors = max_sectors; | |
1986 | spin_lock_irq(&conf->device_lock); | |
1987 | if (mbio->bi_phys_segments == 0) | |
1988 | mbio->bi_phys_segments = 2; | |
1989 | else | |
1990 | mbio->bi_phys_segments++; | |
1991 | spin_unlock_irq(&conf->device_lock); | |
1992 | generic_make_request(bio); | |
1993 | bio = NULL; | |
1994 | ||
1995 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1996 | ||
1997 | r1_bio->master_bio = mbio; | |
1998 | r1_bio->sectors = (mbio->bi_size >> 9) | |
1999 | - sectors_handled; | |
2000 | r1_bio->state = 0; | |
2001 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2002 | r1_bio->mddev = mddev; | |
2003 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2004 | ||
2005 | goto read_more; | |
2006 | } else | |
2007 | generic_make_request(bio); | |
2008 | } | |
2009 | } | |
2010 | ||
fd01b88c | 2011 | static void raid1d(struct mddev *mddev) |
1da177e4 | 2012 | { |
9f2c9d12 | 2013 | struct r1bio *r1_bio; |
1da177e4 | 2014 | unsigned long flags; |
070ec55d | 2015 | conf_t *conf = mddev->private; |
1da177e4 | 2016 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2017 | struct blk_plug plug; |
1da177e4 LT |
2018 | |
2019 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2020 | |
2021 | blk_start_plug(&plug); | |
1da177e4 | 2022 | for (;;) { |
191ea9b2 | 2023 | |
c3b328ac N |
2024 | if (atomic_read(&mddev->plug_cnt) == 0) |
2025 | flush_pending_writes(conf); | |
191ea9b2 | 2026 | |
a35e63ef N |
2027 | spin_lock_irqsave(&conf->device_lock, flags); |
2028 | if (list_empty(head)) { | |
2029 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2030 | break; |
a35e63ef | 2031 | } |
9f2c9d12 | 2032 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2033 | list_del(head->prev); |
ddaf22ab | 2034 | conf->nr_queued--; |
1da177e4 LT |
2035 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2036 | ||
2037 | mddev = r1_bio->mddev; | |
070ec55d | 2038 | conf = mddev->private; |
4367af55 | 2039 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2040 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2041 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2042 | handle_sync_write_finished(conf, r1_bio); | |
2043 | else | |
4367af55 | 2044 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2045 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2046 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2047 | handle_write_finished(conf, r1_bio); | |
2048 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2049 | handle_read_error(conf, r1_bio); | |
2050 | else | |
d2eb35ac N |
2051 | /* just a partial read to be scheduled from separate |
2052 | * context | |
2053 | */ | |
2054 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2055 | |
1d9d5241 | 2056 | cond_resched(); |
de393cde N |
2057 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2058 | md_check_recovery(mddev); | |
1da177e4 | 2059 | } |
e1dfa0a2 | 2060 | blk_finish_plug(&plug); |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | ||
2064 | static int init_resync(conf_t *conf) | |
2065 | { | |
2066 | int buffs; | |
2067 | ||
2068 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2069 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2070 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2071 | conf->poolinfo); | |
2072 | if (!conf->r1buf_pool) | |
2073 | return -ENOMEM; | |
2074 | conf->next_resync = 0; | |
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * perform a "sync" on one "block" | |
2080 | * | |
2081 | * We need to make sure that no normal I/O request - particularly write | |
2082 | * requests - conflict with active sync requests. | |
2083 | * | |
2084 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2085 | * that can be installed to exclude normal IO requests. | |
2086 | */ | |
2087 | ||
fd01b88c | 2088 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2089 | { |
070ec55d | 2090 | conf_t *conf = mddev->private; |
9f2c9d12 | 2091 | struct r1bio *r1_bio; |
1da177e4 LT |
2092 | struct bio *bio; |
2093 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2094 | int disk = -1; |
1da177e4 | 2095 | int i; |
3e198f78 N |
2096 | int wonly = -1; |
2097 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2098 | sector_t sync_blocks; |
e3b9703e | 2099 | int still_degraded = 0; |
06f60385 N |
2100 | int good_sectors = RESYNC_SECTORS; |
2101 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2102 | |
2103 | if (!conf->r1buf_pool) | |
2104 | if (init_resync(conf)) | |
57afd89f | 2105 | return 0; |
1da177e4 | 2106 | |
58c0fed4 | 2107 | max_sector = mddev->dev_sectors; |
1da177e4 | 2108 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2109 | /* If we aborted, we need to abort the |
2110 | * sync on the 'current' bitmap chunk (there will | |
2111 | * only be one in raid1 resync. | |
2112 | * We can find the current addess in mddev->curr_resync | |
2113 | */ | |
6a806c51 N |
2114 | if (mddev->curr_resync < max_sector) /* aborted */ |
2115 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2116 | &sync_blocks, 1); |
6a806c51 | 2117 | else /* completed sync */ |
191ea9b2 | 2118 | conf->fullsync = 0; |
6a806c51 N |
2119 | |
2120 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2121 | close_sync(conf); |
2122 | return 0; | |
2123 | } | |
2124 | ||
07d84d10 N |
2125 | if (mddev->bitmap == NULL && |
2126 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2127 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2128 | conf->fullsync == 0) { |
2129 | *skipped = 1; | |
2130 | return max_sector - sector_nr; | |
2131 | } | |
6394cca5 N |
2132 | /* before building a request, check if we can skip these blocks.. |
2133 | * This call the bitmap_start_sync doesn't actually record anything | |
2134 | */ | |
e3b9703e | 2135 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2136 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2137 | /* We can skip this block, and probably several more */ |
2138 | *skipped = 1; | |
2139 | return sync_blocks; | |
2140 | } | |
1da177e4 | 2141 | /* |
17999be4 N |
2142 | * If there is non-resync activity waiting for a turn, |
2143 | * and resync is going fast enough, | |
2144 | * then let it though before starting on this new sync request. | |
1da177e4 | 2145 | */ |
17999be4 | 2146 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2147 | msleep_interruptible(1000); |
17999be4 | 2148 | |
b47490c9 | 2149 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2150 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2151 | raise_barrier(conf); |
2152 | ||
2153 | conf->next_resync = sector_nr; | |
1da177e4 | 2154 | |
3e198f78 | 2155 | rcu_read_lock(); |
1da177e4 | 2156 | /* |
3e198f78 N |
2157 | * If we get a correctably read error during resync or recovery, |
2158 | * we might want to read from a different device. So we | |
2159 | * flag all drives that could conceivably be read from for READ, | |
2160 | * and any others (which will be non-In_sync devices) for WRITE. | |
2161 | * If a read fails, we try reading from something else for which READ | |
2162 | * is OK. | |
1da177e4 | 2163 | */ |
1da177e4 | 2164 | |
1da177e4 LT |
2165 | r1_bio->mddev = mddev; |
2166 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2167 | r1_bio->state = 0; |
1da177e4 | 2168 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
2169 | |
2170 | for (i=0; i < conf->raid_disks; i++) { | |
3cb03002 | 2171 | struct md_rdev *rdev; |
1da177e4 LT |
2172 | bio = r1_bio->bios[i]; |
2173 | ||
2174 | /* take from bio_init */ | |
2175 | bio->bi_next = NULL; | |
db8d9d35 | 2176 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2177 | bio->bi_flags |= 1 << BIO_UPTODATE; |
db8d9d35 | 2178 | bio->bi_comp_cpu = -1; |
802ba064 | 2179 | bio->bi_rw = READ; |
1da177e4 LT |
2180 | bio->bi_vcnt = 0; |
2181 | bio->bi_idx = 0; | |
2182 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2183 | bio->bi_size = 0; |
2184 | bio->bi_end_io = NULL; | |
2185 | bio->bi_private = NULL; | |
2186 | ||
3e198f78 N |
2187 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2188 | if (rdev == NULL || | |
06f60385 | 2189 | test_bit(Faulty, &rdev->flags)) { |
e3b9703e | 2190 | still_degraded = 1; |
3e198f78 | 2191 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2192 | bio->bi_rw = WRITE; |
2193 | bio->bi_end_io = end_sync_write; | |
2194 | write_targets ++; | |
3e198f78 N |
2195 | } else { |
2196 | /* may need to read from here */ | |
06f60385 N |
2197 | sector_t first_bad = MaxSector; |
2198 | int bad_sectors; | |
2199 | ||
2200 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2201 | &first_bad, &bad_sectors)) { | |
2202 | if (first_bad > sector_nr) | |
2203 | good_sectors = first_bad - sector_nr; | |
2204 | else { | |
2205 | bad_sectors -= (sector_nr - first_bad); | |
2206 | if (min_bad == 0 || | |
2207 | min_bad > bad_sectors) | |
2208 | min_bad = bad_sectors; | |
2209 | } | |
2210 | } | |
2211 | if (sector_nr < first_bad) { | |
2212 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2213 | if (wonly < 0) | |
2214 | wonly = i; | |
2215 | } else { | |
2216 | if (disk < 0) | |
2217 | disk = i; | |
2218 | } | |
2219 | bio->bi_rw = READ; | |
2220 | bio->bi_end_io = end_sync_read; | |
2221 | read_targets++; | |
3e198f78 | 2222 | } |
3e198f78 | 2223 | } |
06f60385 N |
2224 | if (bio->bi_end_io) { |
2225 | atomic_inc(&rdev->nr_pending); | |
2226 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2227 | bio->bi_bdev = rdev->bdev; | |
2228 | bio->bi_private = r1_bio; | |
2229 | } | |
1da177e4 | 2230 | } |
3e198f78 N |
2231 | rcu_read_unlock(); |
2232 | if (disk < 0) | |
2233 | disk = wonly; | |
2234 | r1_bio->read_disk = disk; | |
191ea9b2 | 2235 | |
06f60385 N |
2236 | if (read_targets == 0 && min_bad > 0) { |
2237 | /* These sectors are bad on all InSync devices, so we | |
2238 | * need to mark them bad on all write targets | |
2239 | */ | |
2240 | int ok = 1; | |
2241 | for (i = 0 ; i < conf->raid_disks ; i++) | |
2242 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { | |
3cb03002 | 2243 | struct md_rdev *rdev = |
06f60385 N |
2244 | rcu_dereference(conf->mirrors[i].rdev); |
2245 | ok = rdev_set_badblocks(rdev, sector_nr, | |
2246 | min_bad, 0 | |
2247 | ) && ok; | |
2248 | } | |
2249 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2250 | *skipped = 1; | |
2251 | put_buf(r1_bio); | |
2252 | ||
2253 | if (!ok) { | |
2254 | /* Cannot record the badblocks, so need to | |
2255 | * abort the resync. | |
2256 | * If there are multiple read targets, could just | |
2257 | * fail the really bad ones ??? | |
2258 | */ | |
2259 | conf->recovery_disabled = mddev->recovery_disabled; | |
2260 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2261 | return 0; | |
2262 | } else | |
2263 | return min_bad; | |
2264 | ||
2265 | } | |
2266 | if (min_bad > 0 && min_bad < good_sectors) { | |
2267 | /* only resync enough to reach the next bad->good | |
2268 | * transition */ | |
2269 | good_sectors = min_bad; | |
2270 | } | |
2271 | ||
3e198f78 N |
2272 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2273 | /* extra read targets are also write targets */ | |
2274 | write_targets += read_targets-1; | |
2275 | ||
2276 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2277 | /* There is nowhere to write, so all non-sync |
2278 | * drives must be failed - so we are finished | |
2279 | */ | |
57afd89f N |
2280 | sector_t rv = max_sector - sector_nr; |
2281 | *skipped = 1; | |
1da177e4 | 2282 | put_buf(r1_bio); |
1da177e4 LT |
2283 | return rv; |
2284 | } | |
2285 | ||
c6207277 N |
2286 | if (max_sector > mddev->resync_max) |
2287 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2288 | if (max_sector > sector_nr + good_sectors) |
2289 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2290 | nr_sectors = 0; |
289e99e8 | 2291 | sync_blocks = 0; |
1da177e4 LT |
2292 | do { |
2293 | struct page *page; | |
2294 | int len = PAGE_SIZE; | |
2295 | if (sector_nr + (len>>9) > max_sector) | |
2296 | len = (max_sector - sector_nr) << 9; | |
2297 | if (len == 0) | |
2298 | break; | |
6a806c51 N |
2299 | if (sync_blocks == 0) { |
2300 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2301 | &sync_blocks, still_degraded) && |
2302 | !conf->fullsync && | |
2303 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2304 | break; |
9e77c485 | 2305 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2306 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2307 | len = sync_blocks<<9; |
ab7a30c7 | 2308 | } |
191ea9b2 | 2309 | |
1da177e4 LT |
2310 | for (i=0 ; i < conf->raid_disks; i++) { |
2311 | bio = r1_bio->bios[i]; | |
2312 | if (bio->bi_end_io) { | |
d11c171e | 2313 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2314 | if (bio_add_page(bio, page, len, 0) == 0) { |
2315 | /* stop here */ | |
d11c171e | 2316 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2317 | while (i > 0) { |
2318 | i--; | |
2319 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2320 | if (bio->bi_end_io==NULL) |
2321 | continue; | |
1da177e4 LT |
2322 | /* remove last page from this bio */ |
2323 | bio->bi_vcnt--; | |
2324 | bio->bi_size -= len; | |
2325 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2326 | } | |
2327 | goto bio_full; | |
2328 | } | |
2329 | } | |
2330 | } | |
2331 | nr_sectors += len>>9; | |
2332 | sector_nr += len>>9; | |
191ea9b2 | 2333 | sync_blocks -= (len>>9); |
1da177e4 LT |
2334 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2335 | bio_full: | |
1da177e4 LT |
2336 | r1_bio->sectors = nr_sectors; |
2337 | ||
d11c171e N |
2338 | /* For a user-requested sync, we read all readable devices and do a |
2339 | * compare | |
2340 | */ | |
2341 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2342 | atomic_set(&r1_bio->remaining, read_targets); | |
2343 | for (i=0; i<conf->raid_disks; i++) { | |
2344 | bio = r1_bio->bios[i]; | |
2345 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 2346 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2347 | generic_make_request(bio); |
2348 | } | |
2349 | } | |
2350 | } else { | |
2351 | atomic_set(&r1_bio->remaining, 1); | |
2352 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2353 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2354 | generic_make_request(bio); |
1da177e4 | 2355 | |
d11c171e | 2356 | } |
1da177e4 LT |
2357 | return nr_sectors; |
2358 | } | |
2359 | ||
fd01b88c | 2360 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2361 | { |
2362 | if (sectors) | |
2363 | return sectors; | |
2364 | ||
2365 | return mddev->dev_sectors; | |
2366 | } | |
2367 | ||
fd01b88c | 2368 | static conf_t *setup_conf(struct mddev *mddev) |
1da177e4 LT |
2369 | { |
2370 | conf_t *conf; | |
709ae487 | 2371 | int i; |
0f6d02d5 | 2372 | struct mirror_info *disk; |
3cb03002 | 2373 | struct md_rdev *rdev; |
709ae487 | 2374 | int err = -ENOMEM; |
1da177e4 | 2375 | |
9ffae0cf | 2376 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 | 2377 | if (!conf) |
709ae487 | 2378 | goto abort; |
1da177e4 | 2379 | |
9ffae0cf | 2380 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
2381 | GFP_KERNEL); |
2382 | if (!conf->mirrors) | |
709ae487 | 2383 | goto abort; |
1da177e4 | 2384 | |
ddaf22ab N |
2385 | conf->tmppage = alloc_page(GFP_KERNEL); |
2386 | if (!conf->tmppage) | |
709ae487 | 2387 | goto abort; |
ddaf22ab | 2388 | |
709ae487 | 2389 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2390 | if (!conf->poolinfo) |
709ae487 | 2391 | goto abort; |
1da177e4 LT |
2392 | conf->poolinfo->raid_disks = mddev->raid_disks; |
2393 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2394 | r1bio_pool_free, | |
2395 | conf->poolinfo); | |
2396 | if (!conf->r1bio_pool) | |
709ae487 N |
2397 | goto abort; |
2398 | ||
ed9bfdf1 | 2399 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2400 | |
e7e72bf6 | 2401 | spin_lock_init(&conf->device_lock); |
159ec1fc | 2402 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 2403 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2404 | if (disk_idx >= mddev->raid_disks |
2405 | || disk_idx < 0) | |
2406 | continue; | |
2407 | disk = conf->mirrors + disk_idx; | |
2408 | ||
2409 | disk->rdev = rdev; | |
1da177e4 LT |
2410 | |
2411 | disk->head_position = 0; | |
1da177e4 LT |
2412 | } |
2413 | conf->raid_disks = mddev->raid_disks; | |
2414 | conf->mddev = mddev; | |
1da177e4 | 2415 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2416 | |
2417 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2418 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2419 | |
191ea9b2 | 2420 | bio_list_init(&conf->pending_bio_list); |
191ea9b2 | 2421 | |
709ae487 | 2422 | conf->last_used = -1; |
1da177e4 LT |
2423 | for (i = 0; i < conf->raid_disks; i++) { |
2424 | ||
2425 | disk = conf->mirrors + i; | |
2426 | ||
5fd6c1dc N |
2427 | if (!disk->rdev || |
2428 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2429 | disk->head_position = 0; |
918f0238 N |
2430 | if (disk->rdev) |
2431 | conf->fullsync = 1; | |
709ae487 N |
2432 | } else if (conf->last_used < 0) |
2433 | /* | |
2434 | * The first working device is used as a | |
2435 | * starting point to read balancing. | |
2436 | */ | |
2437 | conf->last_used = i; | |
1da177e4 | 2438 | } |
709ae487 N |
2439 | |
2440 | err = -EIO; | |
2441 | if (conf->last_used < 0) { | |
9dd1e2fa | 2442 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
2443 | mdname(mddev)); |
2444 | goto abort; | |
2445 | } | |
2446 | err = -ENOMEM; | |
2447 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
2448 | if (!conf->thread) { | |
2449 | printk(KERN_ERR | |
9dd1e2fa | 2450 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2451 | mdname(mddev)); |
2452 | goto abort; | |
11ce99e6 | 2453 | } |
1da177e4 | 2454 | |
709ae487 N |
2455 | return conf; |
2456 | ||
2457 | abort: | |
2458 | if (conf) { | |
2459 | if (conf->r1bio_pool) | |
2460 | mempool_destroy(conf->r1bio_pool); | |
2461 | kfree(conf->mirrors); | |
2462 | safe_put_page(conf->tmppage); | |
2463 | kfree(conf->poolinfo); | |
2464 | kfree(conf); | |
2465 | } | |
2466 | return ERR_PTR(err); | |
2467 | } | |
2468 | ||
fd01b88c | 2469 | static int run(struct mddev *mddev) |
709ae487 N |
2470 | { |
2471 | conf_t *conf; | |
2472 | int i; | |
3cb03002 | 2473 | struct md_rdev *rdev; |
709ae487 N |
2474 | |
2475 | if (mddev->level != 1) { | |
9dd1e2fa | 2476 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2477 | mdname(mddev), mddev->level); |
2478 | return -EIO; | |
2479 | } | |
2480 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2481 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2482 | mdname(mddev)); |
2483 | return -EIO; | |
2484 | } | |
1da177e4 | 2485 | /* |
709ae487 N |
2486 | * copy the already verified devices into our private RAID1 |
2487 | * bookkeeping area. [whatever we allocate in run(), | |
2488 | * should be freed in stop()] | |
1da177e4 | 2489 | */ |
709ae487 N |
2490 | if (mddev->private == NULL) |
2491 | conf = setup_conf(mddev); | |
2492 | else | |
2493 | conf = mddev->private; | |
1da177e4 | 2494 | |
709ae487 N |
2495 | if (IS_ERR(conf)) |
2496 | return PTR_ERR(conf); | |
1da177e4 | 2497 | |
709ae487 | 2498 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1ed7242e JB |
2499 | if (!mddev->gendisk) |
2500 | continue; | |
709ae487 N |
2501 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2502 | rdev->data_offset << 9); | |
2503 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
2504 | * violating it, so limit ->max_segments to 1 lying within |
2505 | * a single page, as a one page request is never in violation. | |
709ae487 | 2506 | */ |
627a2d3c N |
2507 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
2508 | blk_queue_max_segments(mddev->queue, 1); | |
2509 | blk_queue_segment_boundary(mddev->queue, | |
2510 | PAGE_CACHE_SIZE - 1); | |
2511 | } | |
1da177e4 | 2512 | } |
191ea9b2 | 2513 | |
709ae487 N |
2514 | mddev->degraded = 0; |
2515 | for (i=0; i < conf->raid_disks; i++) | |
2516 | if (conf->mirrors[i].rdev == NULL || | |
2517 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2518 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2519 | mddev->degraded++; | |
2520 | ||
2521 | if (conf->raid_disks - mddev->degraded == 1) | |
2522 | mddev->recovery_cp = MaxSector; | |
2523 | ||
8c6ac868 | 2524 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2525 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2526 | " -- starting background reconstruction\n", |
2527 | mdname(mddev)); | |
1da177e4 | 2528 | printk(KERN_INFO |
9dd1e2fa | 2529 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2530 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2531 | mddev->raid_disks); | |
709ae487 | 2532 | |
1da177e4 LT |
2533 | /* |
2534 | * Ok, everything is just fine now | |
2535 | */ | |
709ae487 N |
2536 | mddev->thread = conf->thread; |
2537 | conf->thread = NULL; | |
2538 | mddev->private = conf; | |
2539 | ||
1f403624 | 2540 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2541 | |
1ed7242e JB |
2542 | if (mddev->queue) { |
2543 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2544 | mddev->queue->backing_dev_info.congested_data = mddev; | |
2545 | } | |
a91a2785 | 2546 | return md_integrity_register(mddev); |
1da177e4 LT |
2547 | } |
2548 | ||
fd01b88c | 2549 | static int stop(struct mddev *mddev) |
1da177e4 | 2550 | { |
070ec55d | 2551 | conf_t *conf = mddev->private; |
4b6d287f | 2552 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2553 | |
2554 | /* wait for behind writes to complete */ | |
e555190d | 2555 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2556 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2557 | mdname(mddev)); | |
4b6d287f | 2558 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2559 | wait_event(bitmap->behind_wait, |
2560 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2561 | } |
1da177e4 | 2562 | |
409c57f3 N |
2563 | raise_barrier(conf); |
2564 | lower_barrier(conf); | |
2565 | ||
01f96c0a | 2566 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2567 | if (conf->r1bio_pool) |
2568 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2569 | kfree(conf->mirrors); |
2570 | kfree(conf->poolinfo); | |
1da177e4 LT |
2571 | kfree(conf); |
2572 | mddev->private = NULL; | |
2573 | return 0; | |
2574 | } | |
2575 | ||
fd01b88c | 2576 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2577 | { |
2578 | /* no resync is happening, and there is enough space | |
2579 | * on all devices, so we can resize. | |
2580 | * We need to make sure resync covers any new space. | |
2581 | * If the array is shrinking we should possibly wait until | |
2582 | * any io in the removed space completes, but it hardly seems | |
2583 | * worth it. | |
2584 | */ | |
1f403624 | 2585 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2586 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2587 | return -EINVAL; | |
f233ea5c | 2588 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2589 | revalidate_disk(mddev->gendisk); |
b522adcd | 2590 | if (sectors > mddev->dev_sectors && |
b098636c | 2591 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2592 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2593 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2594 | } | |
b522adcd | 2595 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2596 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2597 | return 0; |
2598 | } | |
2599 | ||
fd01b88c | 2600 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
2601 | { |
2602 | /* We need to: | |
2603 | * 1/ resize the r1bio_pool | |
2604 | * 2/ resize conf->mirrors | |
2605 | * | |
2606 | * We allocate a new r1bio_pool if we can. | |
2607 | * Then raise a device barrier and wait until all IO stops. | |
2608 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2609 | * |
2610 | * At the same time, we "pack" the devices so that all the missing | |
2611 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2612 | */ |
2613 | mempool_t *newpool, *oldpool; | |
2614 | struct pool_info *newpoolinfo; | |
0f6d02d5 | 2615 | struct mirror_info *newmirrors; |
070ec55d | 2616 | conf_t *conf = mddev->private; |
63c70c4f | 2617 | int cnt, raid_disks; |
c04be0aa | 2618 | unsigned long flags; |
b5470dc5 | 2619 | int d, d2, err; |
1da177e4 | 2620 | |
63c70c4f | 2621 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2622 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2623 | mddev->layout != mddev->new_layout || |
2624 | mddev->level != mddev->new_level) { | |
664e7c41 | 2625 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2626 | mddev->new_layout = mddev->layout; |
2627 | mddev->new_level = mddev->level; | |
2628 | return -EINVAL; | |
2629 | } | |
2630 | ||
b5470dc5 DW |
2631 | err = md_allow_write(mddev); |
2632 | if (err) | |
2633 | return err; | |
2a2275d6 | 2634 | |
63c70c4f N |
2635 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2636 | ||
6ea9c07c N |
2637 | if (raid_disks < conf->raid_disks) { |
2638 | cnt=0; | |
2639 | for (d= 0; d < conf->raid_disks; d++) | |
2640 | if (conf->mirrors[d].rdev) | |
2641 | cnt++; | |
2642 | if (cnt > raid_disks) | |
1da177e4 | 2643 | return -EBUSY; |
6ea9c07c | 2644 | } |
1da177e4 LT |
2645 | |
2646 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2647 | if (!newpoolinfo) | |
2648 | return -ENOMEM; | |
2649 | newpoolinfo->mddev = mddev; | |
2650 | newpoolinfo->raid_disks = raid_disks; | |
2651 | ||
2652 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2653 | r1bio_pool_free, newpoolinfo); | |
2654 | if (!newpool) { | |
2655 | kfree(newpoolinfo); | |
2656 | return -ENOMEM; | |
2657 | } | |
9ffae0cf | 2658 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2659 | if (!newmirrors) { |
2660 | kfree(newpoolinfo); | |
2661 | mempool_destroy(newpool); | |
2662 | return -ENOMEM; | |
2663 | } | |
1da177e4 | 2664 | |
17999be4 | 2665 | raise_barrier(conf); |
1da177e4 LT |
2666 | |
2667 | /* ok, everything is stopped */ | |
2668 | oldpool = conf->r1bio_pool; | |
2669 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2670 | |
a88aa786 | 2671 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 2672 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 2673 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 2674 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2675 | rdev->raid_disk = d2; |
36fad858 NK |
2676 | sysfs_unlink_rdev(mddev, rdev); |
2677 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2678 | printk(KERN_WARNING |
36fad858 NK |
2679 | "md/raid1:%s: cannot register rd%d\n", |
2680 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2681 | } |
a88aa786 N |
2682 | if (rdev) |
2683 | newmirrors[d2++].rdev = rdev; | |
2684 | } | |
1da177e4 LT |
2685 | kfree(conf->mirrors); |
2686 | conf->mirrors = newmirrors; | |
2687 | kfree(conf->poolinfo); | |
2688 | conf->poolinfo = newpoolinfo; | |
2689 | ||
c04be0aa | 2690 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2691 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2692 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2693 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2694 | mddev->delta_disks = 0; |
1da177e4 | 2695 | |
6ea9c07c | 2696 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2697 | lower_barrier(conf); |
1da177e4 LT |
2698 | |
2699 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2700 | md_wakeup_thread(mddev->thread); | |
2701 | ||
2702 | mempool_destroy(oldpool); | |
2703 | return 0; | |
2704 | } | |
2705 | ||
fd01b88c | 2706 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 2707 | { |
070ec55d | 2708 | conf_t *conf = mddev->private; |
36fa3063 N |
2709 | |
2710 | switch(state) { | |
6eef4b21 N |
2711 | case 2: /* wake for suspend */ |
2712 | wake_up(&conf->wait_barrier); | |
2713 | break; | |
9e6603da | 2714 | case 1: |
17999be4 | 2715 | raise_barrier(conf); |
36fa3063 | 2716 | break; |
9e6603da | 2717 | case 0: |
17999be4 | 2718 | lower_barrier(conf); |
36fa3063 N |
2719 | break; |
2720 | } | |
36fa3063 N |
2721 | } |
2722 | ||
fd01b88c | 2723 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
2724 | { |
2725 | /* raid1 can take over: | |
2726 | * raid5 with 2 devices, any layout or chunk size | |
2727 | */ | |
2728 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
2729 | conf_t *conf; | |
2730 | mddev->new_level = 1; | |
2731 | mddev->new_layout = 0; | |
2732 | mddev->new_chunk_sectors = 0; | |
2733 | conf = setup_conf(mddev); | |
2734 | if (!IS_ERR(conf)) | |
2735 | conf->barrier = 1; | |
2736 | return conf; | |
2737 | } | |
2738 | return ERR_PTR(-EINVAL); | |
2739 | } | |
1da177e4 | 2740 | |
2604b703 | 2741 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2742 | { |
2743 | .name = "raid1", | |
2604b703 | 2744 | .level = 1, |
1da177e4 LT |
2745 | .owner = THIS_MODULE, |
2746 | .make_request = make_request, | |
2747 | .run = run, | |
2748 | .stop = stop, | |
2749 | .status = status, | |
2750 | .error_handler = error, | |
2751 | .hot_add_disk = raid1_add_disk, | |
2752 | .hot_remove_disk= raid1_remove_disk, | |
2753 | .spare_active = raid1_spare_active, | |
2754 | .sync_request = sync_request, | |
2755 | .resize = raid1_resize, | |
80c3a6ce | 2756 | .size = raid1_size, |
63c70c4f | 2757 | .check_reshape = raid1_reshape, |
36fa3063 | 2758 | .quiesce = raid1_quiesce, |
709ae487 | 2759 | .takeover = raid1_takeover, |
1da177e4 LT |
2760 | }; |
2761 | ||
2762 | static int __init raid_init(void) | |
2763 | { | |
2604b703 | 2764 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2765 | } |
2766 | ||
2767 | static void raid_exit(void) | |
2768 | { | |
2604b703 | 2769 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2770 | } |
2771 | ||
2772 | module_init(raid_init); | |
2773 | module_exit(raid_exit); | |
2774 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2775 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2776 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2777 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2778 | MODULE_ALIAS("md-level-1"); |