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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
43b2e5d8 | 40 | #include "md.h" |
ef740c37 CH |
41 | #include "raid1.h" |
42 | #include "bitmap.h" | |
191ea9b2 | 43 | |
1da177e4 LT |
44 | /* |
45 | * Number of guaranteed r1bios in case of extreme VM load: | |
46 | */ | |
47 | #define NR_RAID1_BIOS 256 | |
48 | ||
34db0cd6 N |
49 | /* When there are this many requests queue to be written by |
50 | * the raid1 thread, we become 'congested' to provide back-pressure | |
51 | * for writeback. | |
52 | */ | |
53 | static int max_queued_requests = 1024; | |
1da177e4 | 54 | |
e8096360 N |
55 | static void allow_barrier(struct r1conf *conf); |
56 | static void lower_barrier(struct r1conf *conf); | |
1da177e4 | 57 | |
dd0fc66f | 58 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
59 | { |
60 | struct pool_info *pi = data; | |
9f2c9d12 | 61 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
62 | |
63 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 64 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
65 | } |
66 | ||
67 | static void r1bio_pool_free(void *r1_bio, void *data) | |
68 | { | |
69 | kfree(r1_bio); | |
70 | } | |
71 | ||
72 | #define RESYNC_BLOCK_SIZE (64*1024) | |
73 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
74 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
75 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
76 | #define RESYNC_WINDOW (2048*1024) | |
77 | ||
dd0fc66f | 78 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
79 | { |
80 | struct pool_info *pi = data; | |
81 | struct page *page; | |
9f2c9d12 | 82 | struct r1bio *r1_bio; |
1da177e4 LT |
83 | struct bio *bio; |
84 | int i, j; | |
85 | ||
86 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 87 | if (!r1_bio) |
1da177e4 | 88 | return NULL; |
1da177e4 LT |
89 | |
90 | /* | |
91 | * Allocate bios : 1 for reading, n-1 for writing | |
92 | */ | |
93 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 94 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
95 | if (!bio) |
96 | goto out_free_bio; | |
97 | r1_bio->bios[j] = bio; | |
98 | } | |
99 | /* | |
100 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
101 | * the first bio. |
102 | * If this is a user-requested check/repair, allocate | |
103 | * RESYNC_PAGES for each bio. | |
1da177e4 | 104 | */ |
d11c171e N |
105 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
106 | j = pi->raid_disks; | |
107 | else | |
108 | j = 1; | |
109 | while(j--) { | |
110 | bio = r1_bio->bios[j]; | |
111 | for (i = 0; i < RESYNC_PAGES; i++) { | |
112 | page = alloc_page(gfp_flags); | |
113 | if (unlikely(!page)) | |
114 | goto out_free_pages; | |
115 | ||
116 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 117 | bio->bi_vcnt = i+1; |
d11c171e N |
118 | } |
119 | } | |
120 | /* If not user-requests, copy the page pointers to all bios */ | |
121 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
122 | for (i=0; i<RESYNC_PAGES ; i++) | |
123 | for (j=1; j<pi->raid_disks; j++) | |
124 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
125 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
126 | } |
127 | ||
128 | r1_bio->master_bio = NULL; | |
129 | ||
130 | return r1_bio; | |
131 | ||
132 | out_free_pages: | |
303a0e11 N |
133 | for (j=0 ; j < pi->raid_disks; j++) |
134 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
135 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 136 | j = -1; |
1da177e4 LT |
137 | out_free_bio: |
138 | while ( ++j < pi->raid_disks ) | |
139 | bio_put(r1_bio->bios[j]); | |
140 | r1bio_pool_free(r1_bio, data); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
145 | { | |
146 | struct pool_info *pi = data; | |
d11c171e | 147 | int i,j; |
9f2c9d12 | 148 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 149 | |
d11c171e N |
150 | for (i = 0; i < RESYNC_PAGES; i++) |
151 | for (j = pi->raid_disks; j-- ;) { | |
152 | if (j == 0 || | |
153 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
154 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 155 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 156 | } |
1da177e4 LT |
157 | for (i=0 ; i < pi->raid_disks; i++) |
158 | bio_put(r1bio->bios[i]); | |
159 | ||
160 | r1bio_pool_free(r1bio, data); | |
161 | } | |
162 | ||
e8096360 | 163 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
164 | { |
165 | int i; | |
166 | ||
167 | for (i = 0; i < conf->raid_disks; i++) { | |
168 | struct bio **bio = r1_bio->bios + i; | |
4367af55 | 169 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
170 | bio_put(*bio); |
171 | *bio = NULL; | |
172 | } | |
173 | } | |
174 | ||
9f2c9d12 | 175 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 176 | { |
e8096360 | 177 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 178 | |
1da177e4 LT |
179 | put_all_bios(conf, r1_bio); |
180 | mempool_free(r1_bio, conf->r1bio_pool); | |
181 | } | |
182 | ||
9f2c9d12 | 183 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 184 | { |
e8096360 | 185 | struct r1conf *conf = r1_bio->mddev->private; |
3e198f78 N |
186 | int i; |
187 | ||
188 | for (i=0; i<conf->raid_disks; i++) { | |
189 | struct bio *bio = r1_bio->bios[i]; | |
190 | if (bio->bi_end_io) | |
191 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
192 | } | |
1da177e4 LT |
193 | |
194 | mempool_free(r1_bio, conf->r1buf_pool); | |
195 | ||
17999be4 | 196 | lower_barrier(conf); |
1da177e4 LT |
197 | } |
198 | ||
9f2c9d12 | 199 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
200 | { |
201 | unsigned long flags; | |
fd01b88c | 202 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 203 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
204 | |
205 | spin_lock_irqsave(&conf->device_lock, flags); | |
206 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 207 | conf->nr_queued ++; |
1da177e4 LT |
208 | spin_unlock_irqrestore(&conf->device_lock, flags); |
209 | ||
17999be4 | 210 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
211 | md_wakeup_thread(mddev->thread); |
212 | } | |
213 | ||
214 | /* | |
215 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
216 | * operation and are ready to return a success/failure code to the buffer | |
217 | * cache layer. | |
218 | */ | |
9f2c9d12 | 219 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
220 | { |
221 | struct bio *bio = r1_bio->master_bio; | |
222 | int done; | |
e8096360 | 223 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
224 | |
225 | if (bio->bi_phys_segments) { | |
226 | unsigned long flags; | |
227 | spin_lock_irqsave(&conf->device_lock, flags); | |
228 | bio->bi_phys_segments--; | |
229 | done = (bio->bi_phys_segments == 0); | |
230 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
231 | } else | |
232 | done = 1; | |
233 | ||
234 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
235 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
236 | if (done) { | |
237 | bio_endio(bio, 0); | |
238 | /* | |
239 | * Wake up any possible resync thread that waits for the device | |
240 | * to go idle. | |
241 | */ | |
242 | allow_barrier(conf); | |
243 | } | |
244 | } | |
245 | ||
9f2c9d12 | 246 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
247 | { |
248 | struct bio *bio = r1_bio->master_bio; | |
249 | ||
4b6d287f N |
250 | /* if nobody has done the final endio yet, do it now */ |
251 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
252 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
253 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
254 | (unsigned long long) bio->bi_sector, | |
255 | (unsigned long long) bio->bi_sector + | |
256 | (bio->bi_size >> 9) - 1); | |
4b6d287f | 257 | |
d2eb35ac | 258 | call_bio_endio(r1_bio); |
4b6d287f | 259 | } |
1da177e4 LT |
260 | free_r1bio(r1_bio); |
261 | } | |
262 | ||
263 | /* | |
264 | * Update disk head position estimator based on IRQ completion info. | |
265 | */ | |
9f2c9d12 | 266 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 267 | { |
e8096360 | 268 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
269 | |
270 | conf->mirrors[disk].head_position = | |
271 | r1_bio->sector + (r1_bio->sectors); | |
272 | } | |
273 | ||
ba3ae3be NK |
274 | /* |
275 | * Find the disk number which triggered given bio | |
276 | */ | |
9f2c9d12 | 277 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
278 | { |
279 | int mirror; | |
30194636 N |
280 | struct r1conf *conf = r1_bio->mddev->private; |
281 | int raid_disks = conf->raid_disks; | |
ba3ae3be NK |
282 | |
283 | for (mirror = 0; mirror < raid_disks; mirror++) | |
284 | if (r1_bio->bios[mirror] == bio) | |
285 | break; | |
286 | ||
287 | BUG_ON(mirror == raid_disks); | |
288 | update_head_pos(mirror, r1_bio); | |
289 | ||
290 | return mirror; | |
291 | } | |
292 | ||
6712ecf8 | 293 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
294 | { |
295 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 296 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 297 | int mirror; |
e8096360 | 298 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 299 | |
1da177e4 LT |
300 | mirror = r1_bio->read_disk; |
301 | /* | |
302 | * this branch is our 'one mirror IO has finished' event handler: | |
303 | */ | |
ddaf22ab N |
304 | update_head_pos(mirror, r1_bio); |
305 | ||
dd00a99e N |
306 | if (uptodate) |
307 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
308 | else { | |
309 | /* If all other devices have failed, we want to return | |
310 | * the error upwards rather than fail the last device. | |
311 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 312 | */ |
dd00a99e N |
313 | unsigned long flags; |
314 | spin_lock_irqsave(&conf->device_lock, flags); | |
315 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
316 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
317 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
318 | uptodate = 1; | |
319 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
320 | } | |
1da177e4 | 321 | |
dd00a99e | 322 | if (uptodate) |
1da177e4 | 323 | raid_end_bio_io(r1_bio); |
dd00a99e | 324 | else { |
1da177e4 LT |
325 | /* |
326 | * oops, read error: | |
327 | */ | |
328 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
329 | printk_ratelimited( |
330 | KERN_ERR "md/raid1:%s: %s: " | |
331 | "rescheduling sector %llu\n", | |
332 | mdname(conf->mddev), | |
333 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
334 | b), | |
335 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 336 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 LT |
337 | reschedule_retry(r1_bio); |
338 | } | |
339 | ||
340 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
341 | } |
342 | ||
9f2c9d12 | 343 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
344 | { |
345 | /* it really is the end of this request */ | |
346 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
347 | /* free extra copy of the data pages */ | |
348 | int i = r1_bio->behind_page_count; | |
349 | while (i--) | |
350 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
351 | kfree(r1_bio->behind_bvecs); | |
352 | r1_bio->behind_bvecs = NULL; | |
353 | } | |
354 | /* clear the bitmap if all writes complete successfully */ | |
355 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
356 | r1_bio->sectors, | |
357 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
358 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
359 | md_write_end(r1_bio->mddev); | |
360 | } | |
361 | ||
9f2c9d12 | 362 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 363 | { |
cd5ff9a1 N |
364 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
365 | return; | |
366 | ||
367 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
368 | reschedule_retry(r1_bio); | |
369 | else { | |
370 | close_write(r1_bio); | |
4367af55 N |
371 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
372 | reschedule_retry(r1_bio); | |
373 | else | |
374 | raid_end_bio_io(r1_bio); | |
4e78064f N |
375 | } |
376 | } | |
377 | ||
6712ecf8 | 378 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
379 | { |
380 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 381 | struct r1bio *r1_bio = bio->bi_private; |
a9701a30 | 382 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 383 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 384 | struct bio *to_put = NULL; |
1da177e4 | 385 | |
ba3ae3be | 386 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 387 | |
e9c7469b TH |
388 | /* |
389 | * 'one mirror IO has finished' event handler: | |
390 | */ | |
e9c7469b | 391 | if (!uptodate) { |
cd5ff9a1 N |
392 | set_bit(WriteErrorSeen, |
393 | &conf->mirrors[mirror].rdev->flags); | |
394 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 395 | } else { |
1da177e4 | 396 | /* |
e9c7469b TH |
397 | * Set R1BIO_Uptodate in our master bio, so that we |
398 | * will return a good error code for to the higher | |
399 | * levels even if IO on some other mirrored buffer | |
400 | * fails. | |
401 | * | |
402 | * The 'master' represents the composite IO operation | |
403 | * to user-side. So if something waits for IO, then it | |
404 | * will wait for the 'master' bio. | |
1da177e4 | 405 | */ |
4367af55 N |
406 | sector_t first_bad; |
407 | int bad_sectors; | |
408 | ||
cd5ff9a1 N |
409 | r1_bio->bios[mirror] = NULL; |
410 | to_put = bio; | |
e9c7469b TH |
411 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
412 | ||
4367af55 N |
413 | /* Maybe we can clear some bad blocks. */ |
414 | if (is_badblock(conf->mirrors[mirror].rdev, | |
415 | r1_bio->sector, r1_bio->sectors, | |
416 | &first_bad, &bad_sectors)) { | |
417 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
418 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
419 | } | |
420 | } | |
421 | ||
e9c7469b TH |
422 | if (behind) { |
423 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
424 | atomic_dec(&r1_bio->behind_remaining); | |
425 | ||
426 | /* | |
427 | * In behind mode, we ACK the master bio once the I/O | |
428 | * has safely reached all non-writemostly | |
429 | * disks. Setting the Returned bit ensures that this | |
430 | * gets done only once -- we don't ever want to return | |
431 | * -EIO here, instead we'll wait | |
432 | */ | |
433 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
434 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
435 | /* Maybe we can return now */ | |
436 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
437 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
438 | pr_debug("raid1: behind end write sectors" |
439 | " %llu-%llu\n", | |
440 | (unsigned long long) mbio->bi_sector, | |
441 | (unsigned long long) mbio->bi_sector + | |
442 | (mbio->bi_size >> 9) - 1); | |
d2eb35ac | 443 | call_bio_endio(r1_bio); |
4b6d287f N |
444 | } |
445 | } | |
446 | } | |
4367af55 N |
447 | if (r1_bio->bios[mirror] == NULL) |
448 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
449 | conf->mddev); | |
e9c7469b | 450 | |
1da177e4 | 451 | /* |
1da177e4 LT |
452 | * Let's see if all mirrored write operations have finished |
453 | * already. | |
454 | */ | |
af6d7b76 | 455 | r1_bio_write_done(r1_bio); |
c70810b3 | 456 | |
04b857f7 N |
457 | if (to_put) |
458 | bio_put(to_put); | |
1da177e4 LT |
459 | } |
460 | ||
461 | ||
462 | /* | |
463 | * This routine returns the disk from which the requested read should | |
464 | * be done. There is a per-array 'next expected sequential IO' sector | |
465 | * number - if this matches on the next IO then we use the last disk. | |
466 | * There is also a per-disk 'last know head position' sector that is | |
467 | * maintained from IRQ contexts, both the normal and the resync IO | |
468 | * completion handlers update this position correctly. If there is no | |
469 | * perfect sequential match then we pick the disk whose head is closest. | |
470 | * | |
471 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
472 | * because position is mirror, not device based. | |
473 | * | |
474 | * The rdev for the device selected will have nr_pending incremented. | |
475 | */ | |
e8096360 | 476 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 477 | { |
af3a2cd6 | 478 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
479 | int sectors; |
480 | int best_good_sectors; | |
f3ac8bf7 | 481 | int start_disk; |
76073054 | 482 | int best_disk; |
f3ac8bf7 | 483 | int i; |
76073054 | 484 | sector_t best_dist; |
3cb03002 | 485 | struct md_rdev *rdev; |
f3ac8bf7 | 486 | int choose_first; |
1da177e4 LT |
487 | |
488 | rcu_read_lock(); | |
489 | /* | |
8ddf9efe | 490 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
491 | * device if no resync is going on, or below the resync window. |
492 | * We take the first readable disk when above the resync window. | |
493 | */ | |
494 | retry: | |
d2eb35ac | 495 | sectors = r1_bio->sectors; |
76073054 N |
496 | best_disk = -1; |
497 | best_dist = MaxSector; | |
d2eb35ac N |
498 | best_good_sectors = 0; |
499 | ||
1da177e4 LT |
500 | if (conf->mddev->recovery_cp < MaxSector && |
501 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
502 | choose_first = 1; |
503 | start_disk = 0; | |
504 | } else { | |
505 | choose_first = 0; | |
506 | start_disk = conf->last_used; | |
1da177e4 LT |
507 | } |
508 | ||
f3ac8bf7 | 509 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 510 | sector_t dist; |
d2eb35ac N |
511 | sector_t first_bad; |
512 | int bad_sectors; | |
513 | ||
f3ac8bf7 N |
514 | int disk = start_disk + i; |
515 | if (disk >= conf->raid_disks) | |
516 | disk -= conf->raid_disks; | |
517 | ||
518 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
519 | if (r1_bio->bios[disk] == IO_BLOCKED | |
520 | || rdev == NULL | |
76073054 | 521 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 522 | continue; |
76073054 N |
523 | if (!test_bit(In_sync, &rdev->flags) && |
524 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 525 | continue; |
76073054 N |
526 | if (test_bit(WriteMostly, &rdev->flags)) { |
527 | /* Don't balance among write-mostly, just | |
528 | * use the first as a last resort */ | |
529 | if (best_disk < 0) | |
530 | best_disk = disk; | |
531 | continue; | |
532 | } | |
533 | /* This is a reasonable device to use. It might | |
534 | * even be best. | |
535 | */ | |
d2eb35ac N |
536 | if (is_badblock(rdev, this_sector, sectors, |
537 | &first_bad, &bad_sectors)) { | |
538 | if (best_dist < MaxSector) | |
539 | /* already have a better device */ | |
540 | continue; | |
541 | if (first_bad <= this_sector) { | |
542 | /* cannot read here. If this is the 'primary' | |
543 | * device, then we must not read beyond | |
544 | * bad_sectors from another device.. | |
545 | */ | |
546 | bad_sectors -= (this_sector - first_bad); | |
547 | if (choose_first && sectors > bad_sectors) | |
548 | sectors = bad_sectors; | |
549 | if (best_good_sectors > sectors) | |
550 | best_good_sectors = sectors; | |
551 | ||
552 | } else { | |
553 | sector_t good_sectors = first_bad - this_sector; | |
554 | if (good_sectors > best_good_sectors) { | |
555 | best_good_sectors = good_sectors; | |
556 | best_disk = disk; | |
557 | } | |
558 | if (choose_first) | |
559 | break; | |
560 | } | |
561 | continue; | |
562 | } else | |
563 | best_good_sectors = sectors; | |
564 | ||
76073054 N |
565 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
566 | if (choose_first | |
567 | /* Don't change to another disk for sequential reads */ | |
568 | || conf->next_seq_sect == this_sector | |
569 | || dist == 0 | |
570 | /* If device is idle, use it */ | |
571 | || atomic_read(&rdev->nr_pending) == 0) { | |
572 | best_disk = disk; | |
1da177e4 LT |
573 | break; |
574 | } | |
76073054 N |
575 | if (dist < best_dist) { |
576 | best_dist = dist; | |
577 | best_disk = disk; | |
1da177e4 | 578 | } |
f3ac8bf7 | 579 | } |
1da177e4 | 580 | |
76073054 N |
581 | if (best_disk >= 0) { |
582 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
583 | if (!rdev) |
584 | goto retry; | |
585 | atomic_inc(&rdev->nr_pending); | |
76073054 | 586 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
587 | /* cannot risk returning a device that failed |
588 | * before we inc'ed nr_pending | |
589 | */ | |
03c902e1 | 590 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
591 | goto retry; |
592 | } | |
d2eb35ac | 593 | sectors = best_good_sectors; |
8ddf9efe | 594 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 595 | conf->last_used = best_disk; |
1da177e4 LT |
596 | } |
597 | rcu_read_unlock(); | |
d2eb35ac | 598 | *max_sectors = sectors; |
1da177e4 | 599 | |
76073054 | 600 | return best_disk; |
1da177e4 LT |
601 | } |
602 | ||
fd01b88c | 603 | int md_raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 604 | { |
e8096360 | 605 | struct r1conf *conf = mddev->private; |
0d129228 N |
606 | int i, ret = 0; |
607 | ||
34db0cd6 N |
608 | if ((bits & (1 << BDI_async_congested)) && |
609 | conf->pending_count >= max_queued_requests) | |
610 | return 1; | |
611 | ||
0d129228 | 612 | rcu_read_lock(); |
30194636 | 613 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 614 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 615 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 616 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 617 | |
1ed7242e JB |
618 | BUG_ON(!q); |
619 | ||
0d129228 N |
620 | /* Note the '|| 1' - when read_balance prefers |
621 | * non-congested targets, it can be removed | |
622 | */ | |
91a9e99d | 623 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
624 | ret |= bdi_congested(&q->backing_dev_info, bits); |
625 | else | |
626 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
627 | } | |
628 | } | |
629 | rcu_read_unlock(); | |
630 | return ret; | |
631 | } | |
1ed7242e | 632 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 633 | |
1ed7242e JB |
634 | static int raid1_congested(void *data, int bits) |
635 | { | |
fd01b88c | 636 | struct mddev *mddev = data; |
1ed7242e JB |
637 | |
638 | return mddev_congested(mddev, bits) || | |
639 | md_raid1_congested(mddev, bits); | |
640 | } | |
0d129228 | 641 | |
e8096360 | 642 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
643 | { |
644 | /* Any writes that have been queued but are awaiting | |
645 | * bitmap updates get flushed here. | |
a35e63ef | 646 | */ |
a35e63ef N |
647 | spin_lock_irq(&conf->device_lock); |
648 | ||
649 | if (conf->pending_bio_list.head) { | |
650 | struct bio *bio; | |
651 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 652 | conf->pending_count = 0; |
a35e63ef N |
653 | spin_unlock_irq(&conf->device_lock); |
654 | /* flush any pending bitmap writes to | |
655 | * disk before proceeding w/ I/O */ | |
656 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 657 | wake_up(&conf->wait_barrier); |
a35e63ef N |
658 | |
659 | while (bio) { /* submit pending writes */ | |
660 | struct bio *next = bio->bi_next; | |
661 | bio->bi_next = NULL; | |
662 | generic_make_request(bio); | |
663 | bio = next; | |
664 | } | |
a35e63ef N |
665 | } else |
666 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
667 | } |
668 | ||
17999be4 N |
669 | /* Barriers.... |
670 | * Sometimes we need to suspend IO while we do something else, | |
671 | * either some resync/recovery, or reconfigure the array. | |
672 | * To do this we raise a 'barrier'. | |
673 | * The 'barrier' is a counter that can be raised multiple times | |
674 | * to count how many activities are happening which preclude | |
675 | * normal IO. | |
676 | * We can only raise the barrier if there is no pending IO. | |
677 | * i.e. if nr_pending == 0. | |
678 | * We choose only to raise the barrier if no-one is waiting for the | |
679 | * barrier to go down. This means that as soon as an IO request | |
680 | * is ready, no other operations which require a barrier will start | |
681 | * until the IO request has had a chance. | |
682 | * | |
683 | * So: regular IO calls 'wait_barrier'. When that returns there | |
684 | * is no backgroup IO happening, It must arrange to call | |
685 | * allow_barrier when it has finished its IO. | |
686 | * backgroup IO calls must call raise_barrier. Once that returns | |
687 | * there is no normal IO happeing. It must arrange to call | |
688 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
689 | */ |
690 | #define RESYNC_DEPTH 32 | |
691 | ||
e8096360 | 692 | static void raise_barrier(struct r1conf *conf) |
1da177e4 LT |
693 | { |
694 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
695 | |
696 | /* Wait until no block IO is waiting */ | |
697 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 698 | conf->resync_lock, ); |
17999be4 N |
699 | |
700 | /* block any new IO from starting */ | |
701 | conf->barrier++; | |
702 | ||
046abeed | 703 | /* Now wait for all pending IO to complete */ |
17999be4 N |
704 | wait_event_lock_irq(conf->wait_barrier, |
705 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 706 | conf->resync_lock, ); |
17999be4 N |
707 | |
708 | spin_unlock_irq(&conf->resync_lock); | |
709 | } | |
710 | ||
e8096360 | 711 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
712 | { |
713 | unsigned long flags; | |
709ae487 | 714 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
715 | spin_lock_irqsave(&conf->resync_lock, flags); |
716 | conf->barrier--; | |
717 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
718 | wake_up(&conf->wait_barrier); | |
719 | } | |
720 | ||
e8096360 | 721 | static void wait_barrier(struct r1conf *conf) |
17999be4 N |
722 | { |
723 | spin_lock_irq(&conf->resync_lock); | |
724 | if (conf->barrier) { | |
725 | conf->nr_waiting++; | |
726 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
727 | conf->resync_lock, | |
c3b328ac | 728 | ); |
17999be4 | 729 | conf->nr_waiting--; |
1da177e4 | 730 | } |
17999be4 | 731 | conf->nr_pending++; |
1da177e4 LT |
732 | spin_unlock_irq(&conf->resync_lock); |
733 | } | |
734 | ||
e8096360 | 735 | static void allow_barrier(struct r1conf *conf) |
17999be4 N |
736 | { |
737 | unsigned long flags; | |
738 | spin_lock_irqsave(&conf->resync_lock, flags); | |
739 | conf->nr_pending--; | |
740 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
741 | wake_up(&conf->wait_barrier); | |
742 | } | |
743 | ||
e8096360 | 744 | static void freeze_array(struct r1conf *conf) |
ddaf22ab N |
745 | { |
746 | /* stop syncio and normal IO and wait for everything to | |
747 | * go quite. | |
748 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
749 | * wait until nr_pending match nr_queued+1 |
750 | * This is called in the context of one normal IO request | |
751 | * that has failed. Thus any sync request that might be pending | |
752 | * will be blocked by nr_pending, and we need to wait for | |
753 | * pending IO requests to complete or be queued for re-try. | |
754 | * Thus the number queued (nr_queued) plus this request (1) | |
755 | * must match the number of pending IOs (nr_pending) before | |
756 | * we continue. | |
ddaf22ab N |
757 | */ |
758 | spin_lock_irq(&conf->resync_lock); | |
759 | conf->barrier++; | |
760 | conf->nr_waiting++; | |
761 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 762 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 763 | conf->resync_lock, |
c3b328ac | 764 | flush_pending_writes(conf)); |
ddaf22ab N |
765 | spin_unlock_irq(&conf->resync_lock); |
766 | } | |
e8096360 | 767 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
768 | { |
769 | /* reverse the effect of the freeze */ | |
770 | spin_lock_irq(&conf->resync_lock); | |
771 | conf->barrier--; | |
772 | conf->nr_waiting--; | |
773 | wake_up(&conf->wait_barrier); | |
774 | spin_unlock_irq(&conf->resync_lock); | |
775 | } | |
776 | ||
17999be4 | 777 | |
4e78064f | 778 | /* duplicate the data pages for behind I/O |
4e78064f | 779 | */ |
9f2c9d12 | 780 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
781 | { |
782 | int i; | |
783 | struct bio_vec *bvec; | |
2ca68f5e | 784 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 785 | GFP_NOIO); |
2ca68f5e | 786 | if (unlikely(!bvecs)) |
af6d7b76 | 787 | return; |
4b6d287f | 788 | |
4b6d287f | 789 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
790 | bvecs[i] = *bvec; |
791 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
792 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 793 | goto do_sync_io; |
2ca68f5e N |
794 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
795 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
796 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
797 | kunmap(bvec->bv_page); |
798 | } | |
2ca68f5e | 799 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
800 | r1_bio->behind_page_count = bio->bi_vcnt; |
801 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
802 | return; | |
4b6d287f N |
803 | |
804 | do_sync_io: | |
af6d7b76 | 805 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
806 | if (bvecs[i].bv_page) |
807 | put_page(bvecs[i].bv_page); | |
808 | kfree(bvecs); | |
36a4e1fe | 809 | pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
810 | } |
811 | ||
b4fdcb02 | 812 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 813 | { |
e8096360 | 814 | struct r1conf *conf = mddev->private; |
0f6d02d5 | 815 | struct mirror_info *mirror; |
9f2c9d12 | 816 | struct r1bio *r1_bio; |
1da177e4 | 817 | struct bio *read_bio; |
1f68f0c4 | 818 | int i, disks; |
84255d10 | 819 | struct bitmap *bitmap; |
191ea9b2 | 820 | unsigned long flags; |
a362357b | 821 | const int rw = bio_data_dir(bio); |
2c7d46ec | 822 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 823 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
3cb03002 | 824 | struct md_rdev *blocked_rdev; |
c3b328ac | 825 | int plugged; |
1f68f0c4 N |
826 | int first_clone; |
827 | int sectors_handled; | |
828 | int max_sectors; | |
191ea9b2 | 829 | |
1da177e4 LT |
830 | /* |
831 | * Register the new request and wait if the reconstruction | |
832 | * thread has put up a bar for new requests. | |
833 | * Continue immediately if no resync is active currently. | |
834 | */ | |
62de608d | 835 | |
3d310eb7 N |
836 | md_write_start(mddev, bio); /* wait on superblock update early */ |
837 | ||
6eef4b21 N |
838 | if (bio_data_dir(bio) == WRITE && |
839 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
840 | bio->bi_sector < mddev->suspend_hi) { | |
841 | /* As the suspend_* range is controlled by | |
842 | * userspace, we want an interruptible | |
843 | * wait. | |
844 | */ | |
845 | DEFINE_WAIT(w); | |
846 | for (;;) { | |
847 | flush_signals(current); | |
848 | prepare_to_wait(&conf->wait_barrier, | |
849 | &w, TASK_INTERRUPTIBLE); | |
850 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
851 | bio->bi_sector >= mddev->suspend_hi) | |
852 | break; | |
853 | schedule(); | |
854 | } | |
855 | finish_wait(&conf->wait_barrier, &w); | |
856 | } | |
62de608d | 857 | |
17999be4 | 858 | wait_barrier(conf); |
1da177e4 | 859 | |
84255d10 N |
860 | bitmap = mddev->bitmap; |
861 | ||
1da177e4 LT |
862 | /* |
863 | * make_request() can abort the operation when READA is being | |
864 | * used and no empty request is available. | |
865 | * | |
866 | */ | |
867 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
868 | ||
869 | r1_bio->master_bio = bio; | |
870 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 871 | r1_bio->state = 0; |
1da177e4 LT |
872 | r1_bio->mddev = mddev; |
873 | r1_bio->sector = bio->bi_sector; | |
874 | ||
d2eb35ac N |
875 | /* We might need to issue multiple reads to different |
876 | * devices if there are bad blocks around, so we keep | |
877 | * track of the number of reads in bio->bi_phys_segments. | |
878 | * If this is 0, there is only one r1_bio and no locking | |
879 | * will be needed when requests complete. If it is | |
880 | * non-zero, then it is the number of not-completed requests. | |
881 | */ | |
882 | bio->bi_phys_segments = 0; | |
883 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
884 | ||
a362357b | 885 | if (rw == READ) { |
1da177e4 LT |
886 | /* |
887 | * read balancing logic: | |
888 | */ | |
d2eb35ac N |
889 | int rdisk; |
890 | ||
891 | read_again: | |
892 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
893 | |
894 | if (rdisk < 0) { | |
895 | /* couldn't find anywhere to read from */ | |
896 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 897 | return; |
1da177e4 LT |
898 | } |
899 | mirror = conf->mirrors + rdisk; | |
900 | ||
e555190d N |
901 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
902 | bitmap) { | |
903 | /* Reading from a write-mostly device must | |
904 | * take care not to over-take any writes | |
905 | * that are 'behind' | |
906 | */ | |
907 | wait_event(bitmap->behind_wait, | |
908 | atomic_read(&bitmap->behind_writes) == 0); | |
909 | } | |
1da177e4 LT |
910 | r1_bio->read_disk = rdisk; |
911 | ||
a167f663 | 912 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
913 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
914 | max_sectors); | |
1da177e4 LT |
915 | |
916 | r1_bio->bios[rdisk] = read_bio; | |
917 | ||
918 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
919 | read_bio->bi_bdev = mirror->rdev->bdev; | |
920 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 921 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
922 | read_bio->bi_private = r1_bio; |
923 | ||
d2eb35ac N |
924 | if (max_sectors < r1_bio->sectors) { |
925 | /* could not read all from this device, so we will | |
926 | * need another r1_bio. | |
927 | */ | |
d2eb35ac N |
928 | |
929 | sectors_handled = (r1_bio->sector + max_sectors | |
930 | - bio->bi_sector); | |
931 | r1_bio->sectors = max_sectors; | |
932 | spin_lock_irq(&conf->device_lock); | |
933 | if (bio->bi_phys_segments == 0) | |
934 | bio->bi_phys_segments = 2; | |
935 | else | |
936 | bio->bi_phys_segments++; | |
937 | spin_unlock_irq(&conf->device_lock); | |
938 | /* Cannot call generic_make_request directly | |
939 | * as that will be queued in __make_request | |
940 | * and subsequent mempool_alloc might block waiting | |
941 | * for it. So hand bio over to raid1d. | |
942 | */ | |
943 | reschedule_retry(r1_bio); | |
944 | ||
945 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
946 | ||
947 | r1_bio->master_bio = bio; | |
948 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
949 | r1_bio->state = 0; | |
950 | r1_bio->mddev = mddev; | |
951 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
952 | goto read_again; | |
953 | } else | |
954 | generic_make_request(read_bio); | |
5a7bbad2 | 955 | return; |
1da177e4 LT |
956 | } |
957 | ||
958 | /* | |
959 | * WRITE: | |
960 | */ | |
34db0cd6 N |
961 | if (conf->pending_count >= max_queued_requests) { |
962 | md_wakeup_thread(mddev->thread); | |
963 | wait_event(conf->wait_barrier, | |
964 | conf->pending_count < max_queued_requests); | |
965 | } | |
1f68f0c4 | 966 | /* first select target devices under rcu_lock and |
1da177e4 LT |
967 | * inc refcount on their rdev. Record them by setting |
968 | * bios[x] to bio | |
1f68f0c4 N |
969 | * If there are known/acknowledged bad blocks on any device on |
970 | * which we have seen a write error, we want to avoid writing those | |
971 | * blocks. | |
972 | * This potentially requires several writes to write around | |
973 | * the bad blocks. Each set of writes gets it's own r1bio | |
974 | * with a set of bios attached. | |
1da177e4 | 975 | */ |
c3b328ac N |
976 | plugged = mddev_check_plugged(mddev); |
977 | ||
1da177e4 | 978 | disks = conf->raid_disks; |
6bfe0b49 DW |
979 | retry_write: |
980 | blocked_rdev = NULL; | |
1da177e4 | 981 | rcu_read_lock(); |
1f68f0c4 | 982 | max_sectors = r1_bio->sectors; |
1da177e4 | 983 | for (i = 0; i < disks; i++) { |
3cb03002 | 984 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
985 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
986 | atomic_inc(&rdev->nr_pending); | |
987 | blocked_rdev = rdev; | |
988 | break; | |
989 | } | |
1f68f0c4 N |
990 | r1_bio->bios[i] = NULL; |
991 | if (!rdev || test_bit(Faulty, &rdev->flags)) { | |
992 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
993 | continue; | |
994 | } | |
995 | ||
996 | atomic_inc(&rdev->nr_pending); | |
997 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
998 | sector_t first_bad; | |
999 | int bad_sectors; | |
1000 | int is_bad; | |
1001 | ||
1002 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1003 | max_sectors, | |
1004 | &first_bad, &bad_sectors); | |
1005 | if (is_bad < 0) { | |
1006 | /* mustn't write here until the bad block is | |
1007 | * acknowledged*/ | |
1008 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1009 | blocked_rdev = rdev; | |
1010 | break; | |
1011 | } | |
1012 | if (is_bad && first_bad <= r1_bio->sector) { | |
1013 | /* Cannot write here at all */ | |
1014 | bad_sectors -= (r1_bio->sector - first_bad); | |
1015 | if (bad_sectors < max_sectors) | |
1016 | /* mustn't write more than bad_sectors | |
1017 | * to other devices yet | |
1018 | */ | |
1019 | max_sectors = bad_sectors; | |
03c902e1 | 1020 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1021 | /* We don't set R1BIO_Degraded as that |
1022 | * only applies if the disk is | |
1023 | * missing, so it might be re-added, | |
1024 | * and we want to know to recover this | |
1025 | * chunk. | |
1026 | * In this case the device is here, | |
1027 | * and the fact that this chunk is not | |
1028 | * in-sync is recorded in the bad | |
1029 | * block log | |
1030 | */ | |
1031 | continue; | |
964147d5 | 1032 | } |
1f68f0c4 N |
1033 | if (is_bad) { |
1034 | int good_sectors = first_bad - r1_bio->sector; | |
1035 | if (good_sectors < max_sectors) | |
1036 | max_sectors = good_sectors; | |
1037 | } | |
1038 | } | |
1039 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1040 | } |
1041 | rcu_read_unlock(); | |
1042 | ||
6bfe0b49 DW |
1043 | if (unlikely(blocked_rdev)) { |
1044 | /* Wait for this device to become unblocked */ | |
1045 | int j; | |
1046 | ||
1047 | for (j = 0; j < i; j++) | |
1048 | if (r1_bio->bios[j]) | |
1049 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1050 | r1_bio->state = 0; |
6bfe0b49 DW |
1051 | allow_barrier(conf); |
1052 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1053 | wait_barrier(conf); | |
1054 | goto retry_write; | |
1055 | } | |
1056 | ||
1f68f0c4 N |
1057 | if (max_sectors < r1_bio->sectors) { |
1058 | /* We are splitting this write into multiple parts, so | |
1059 | * we need to prepare for allocating another r1_bio. | |
1060 | */ | |
1061 | r1_bio->sectors = max_sectors; | |
1062 | spin_lock_irq(&conf->device_lock); | |
1063 | if (bio->bi_phys_segments == 0) | |
1064 | bio->bi_phys_segments = 2; | |
1065 | else | |
1066 | bio->bi_phys_segments++; | |
1067 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1068 | } |
1f68f0c4 | 1069 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1070 | |
4e78064f | 1071 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1072 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1073 | |
1f68f0c4 | 1074 | first_clone = 1; |
1da177e4 LT |
1075 | for (i = 0; i < disks; i++) { |
1076 | struct bio *mbio; | |
1077 | if (!r1_bio->bios[i]) | |
1078 | continue; | |
1079 | ||
a167f663 | 1080 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1081 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1082 | ||
1083 | if (first_clone) { | |
1084 | /* do behind I/O ? | |
1085 | * Not if there are too many, or cannot | |
1086 | * allocate memory, or a reader on WriteMostly | |
1087 | * is waiting for behind writes to flush */ | |
1088 | if (bitmap && | |
1089 | (atomic_read(&bitmap->behind_writes) | |
1090 | < mddev->bitmap_info.max_write_behind) && | |
1091 | !waitqueue_active(&bitmap->behind_wait)) | |
1092 | alloc_behind_pages(mbio, r1_bio); | |
1093 | ||
1094 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1095 | r1_bio->sectors, | |
1096 | test_bit(R1BIO_BehindIO, | |
1097 | &r1_bio->state)); | |
1098 | first_clone = 0; | |
1099 | } | |
2ca68f5e | 1100 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1101 | struct bio_vec *bvec; |
1102 | int j; | |
1103 | ||
1104 | /* Yes, I really want the '__' version so that | |
1105 | * we clear any unused pointer in the io_vec, rather | |
1106 | * than leave them unchanged. This is important | |
1107 | * because when we come to free the pages, we won't | |
046abeed | 1108 | * know the original bi_idx, so we just free |
4b6d287f N |
1109 | * them all |
1110 | */ | |
1111 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1112 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1113 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1114 | atomic_inc(&r1_bio->behind_remaining); | |
1115 | } | |
1116 | ||
1f68f0c4 N |
1117 | r1_bio->bios[i] = mbio; |
1118 | ||
1119 | mbio->bi_sector = (r1_bio->sector + | |
1120 | conf->mirrors[i].rdev->data_offset); | |
1121 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1122 | mbio->bi_end_io = raid1_end_write_request; | |
1123 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; | |
1124 | mbio->bi_private = r1_bio; | |
1125 | ||
1da177e4 | 1126 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
1127 | spin_lock_irqsave(&conf->device_lock, flags); |
1128 | bio_list_add(&conf->pending_bio_list, mbio); | |
34db0cd6 | 1129 | conf->pending_count++; |
4e78064f | 1130 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1131 | } |
079fa166 N |
1132 | /* Mustn't call r1_bio_write_done before this next test, |
1133 | * as it could result in the bio being freed. | |
1134 | */ | |
1f68f0c4 | 1135 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1136 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1137 | /* We need another r1_bio. It has already been counted |
1138 | * in bio->bi_phys_segments | |
1139 | */ | |
1140 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1141 | r1_bio->master_bio = bio; | |
1142 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1143 | r1_bio->state = 0; | |
1144 | r1_bio->mddev = mddev; | |
1145 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1146 | goto retry_write; | |
1147 | } | |
1148 | ||
079fa166 N |
1149 | r1_bio_write_done(r1_bio); |
1150 | ||
1151 | /* In case raid1d snuck in to freeze_array */ | |
1152 | wake_up(&conf->wait_barrier); | |
1153 | ||
c3b328ac | 1154 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 1155 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
1156 | } |
1157 | ||
fd01b88c | 1158 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1159 | { |
e8096360 | 1160 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1161 | int i; |
1162 | ||
1163 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1164 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1165 | rcu_read_lock(); |
1166 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1167 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1168 | seq_printf(seq, "%s", |
ddac7c7e N |
1169 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1170 | } | |
1171 | rcu_read_unlock(); | |
1da177e4 LT |
1172 | seq_printf(seq, "]"); |
1173 | } | |
1174 | ||
1175 | ||
fd01b88c | 1176 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1177 | { |
1178 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1179 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1180 | |
1181 | /* | |
1182 | * If it is not operational, then we have already marked it as dead | |
1183 | * else if it is the last working disks, ignore the error, let the | |
1184 | * next level up know. | |
1185 | * else mark the drive as failed | |
1186 | */ | |
b2d444d7 | 1187 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1188 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1189 | /* |
1190 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1191 | * normal single drive. |
1192 | * However don't try a recovery from this drive as | |
1193 | * it is very likely to fail. | |
1da177e4 | 1194 | */ |
5389042f | 1195 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1196 | return; |
4044ba58 | 1197 | } |
de393cde | 1198 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1199 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1200 | unsigned long flags; | |
1201 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1202 | mddev->degraded++; |
dd00a99e | 1203 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1204 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1205 | /* |
1206 | * if recovery is running, make sure it aborts. | |
1207 | */ | |
dfc70645 | 1208 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1209 | } else |
1210 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1211 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1212 | printk(KERN_ALERT |
1213 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1214 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1215 | mdname(mddev), bdevname(rdev->bdev, b), |
1216 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1217 | } |
1218 | ||
e8096360 | 1219 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1220 | { |
1221 | int i; | |
1da177e4 | 1222 | |
9dd1e2fa | 1223 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1224 | if (!conf) { |
9dd1e2fa | 1225 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1226 | return; |
1227 | } | |
9dd1e2fa | 1228 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1229 | conf->raid_disks); |
1230 | ||
ddac7c7e | 1231 | rcu_read_lock(); |
1da177e4 LT |
1232 | for (i = 0; i < conf->raid_disks; i++) { |
1233 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1234 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1235 | if (rdev) |
9dd1e2fa | 1236 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1237 | i, !test_bit(In_sync, &rdev->flags), |
1238 | !test_bit(Faulty, &rdev->flags), | |
1239 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1240 | } |
ddac7c7e | 1241 | rcu_read_unlock(); |
1da177e4 LT |
1242 | } |
1243 | ||
e8096360 | 1244 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1245 | { |
17999be4 N |
1246 | wait_barrier(conf); |
1247 | allow_barrier(conf); | |
1da177e4 LT |
1248 | |
1249 | mempool_destroy(conf->r1buf_pool); | |
1250 | conf->r1buf_pool = NULL; | |
1251 | } | |
1252 | ||
fd01b88c | 1253 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1254 | { |
1255 | int i; | |
e8096360 | 1256 | struct r1conf *conf = mddev->private; |
6b965620 N |
1257 | int count = 0; |
1258 | unsigned long flags; | |
1da177e4 LT |
1259 | |
1260 | /* | |
1261 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1262 | * and mark them readable. |
1263 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1264 | */ |
1265 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1266 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
ddac7c7e N |
1267 | if (rdev |
1268 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1269 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1270 | count++; |
654e8b5a | 1271 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1272 | } |
1273 | } | |
6b965620 N |
1274 | spin_lock_irqsave(&conf->device_lock, flags); |
1275 | mddev->degraded -= count; | |
1276 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1277 | |
1278 | print_conf(conf); | |
6b965620 | 1279 | return count; |
1da177e4 LT |
1280 | } |
1281 | ||
1282 | ||
fd01b88c | 1283 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1284 | { |
e8096360 | 1285 | struct r1conf *conf = mddev->private; |
199050ea | 1286 | int err = -EEXIST; |
41158c7e | 1287 | int mirror = 0; |
0f6d02d5 | 1288 | struct mirror_info *p; |
6c2fce2e | 1289 | int first = 0; |
30194636 | 1290 | int last = conf->raid_disks - 1; |
1da177e4 | 1291 | |
5389042f N |
1292 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1293 | return -EBUSY; | |
1294 | ||
6c2fce2e NB |
1295 | if (rdev->raid_disk >= 0) |
1296 | first = last = rdev->raid_disk; | |
1297 | ||
1298 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1299 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1300 | ||
8f6c2e4b MP |
1301 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1302 | rdev->data_offset << 9); | |
627a2d3c N |
1303 | /* as we don't honour merge_bvec_fn, we must |
1304 | * never risk violating it, so limit | |
1305 | * ->max_segments to one lying with a single | |
1306 | * page, as a one page request is never in | |
1307 | * violation. | |
1da177e4 | 1308 | */ |
627a2d3c N |
1309 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1310 | blk_queue_max_segments(mddev->queue, 1); | |
1311 | blk_queue_segment_boundary(mddev->queue, | |
1312 | PAGE_CACHE_SIZE - 1); | |
1313 | } | |
1da177e4 LT |
1314 | |
1315 | p->head_position = 0; | |
1316 | rdev->raid_disk = mirror; | |
199050ea | 1317 | err = 0; |
6aea114a N |
1318 | /* As all devices are equivalent, we don't need a full recovery |
1319 | * if this was recently any drive of the array | |
1320 | */ | |
1321 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1322 | conf->fullsync = 1; |
d6065f7b | 1323 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1324 | break; |
1325 | } | |
ac5e7113 | 1326 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1327 | print_conf(conf); |
199050ea | 1328 | return err; |
1da177e4 LT |
1329 | } |
1330 | ||
b8321b68 | 1331 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1332 | { |
e8096360 | 1333 | struct r1conf *conf = mddev->private; |
1da177e4 | 1334 | int err = 0; |
b8321b68 | 1335 | int number = rdev->raid_disk; |
0f6d02d5 | 1336 | struct mirror_info *p = conf->mirrors+ number; |
1da177e4 LT |
1337 | |
1338 | print_conf(conf); | |
b8321b68 | 1339 | if (rdev == p->rdev) { |
b2d444d7 | 1340 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1341 | atomic_read(&rdev->nr_pending)) { |
1342 | err = -EBUSY; | |
1343 | goto abort; | |
1344 | } | |
046abeed | 1345 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1346 | * is not possible. |
1347 | */ | |
1348 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1349 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1350 | mddev->degraded < conf->raid_disks) { |
1351 | err = -EBUSY; | |
1352 | goto abort; | |
1353 | } | |
1da177e4 | 1354 | p->rdev = NULL; |
fbd568a3 | 1355 | synchronize_rcu(); |
1da177e4 LT |
1356 | if (atomic_read(&rdev->nr_pending)) { |
1357 | /* lost the race, try later */ | |
1358 | err = -EBUSY; | |
1359 | p->rdev = rdev; | |
ac5e7113 | 1360 | goto abort; |
1da177e4 | 1361 | } |
a91a2785 | 1362 | err = md_integrity_register(mddev); |
1da177e4 LT |
1363 | } |
1364 | abort: | |
1365 | ||
1366 | print_conf(conf); | |
1367 | return err; | |
1368 | } | |
1369 | ||
1370 | ||
6712ecf8 | 1371 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1372 | { |
9f2c9d12 | 1373 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1374 | |
0fc280f6 | 1375 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1376 | |
1da177e4 LT |
1377 | /* |
1378 | * we have read a block, now it needs to be re-written, | |
1379 | * or re-read if the read failed. | |
1380 | * We don't do much here, just schedule handling by raid1d | |
1381 | */ | |
69382e85 | 1382 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1383 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1384 | |
1385 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1386 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1387 | } |
1388 | ||
6712ecf8 | 1389 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1390 | { |
1391 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1392 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1393 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1394 | struct r1conf *conf = mddev->private; |
1da177e4 | 1395 | int mirror=0; |
4367af55 N |
1396 | sector_t first_bad; |
1397 | int bad_sectors; | |
1da177e4 | 1398 | |
ba3ae3be NK |
1399 | mirror = find_bio_disk(r1_bio, bio); |
1400 | ||
6b1117d5 | 1401 | if (!uptodate) { |
57dab0bd | 1402 | sector_t sync_blocks = 0; |
6b1117d5 N |
1403 | sector_t s = r1_bio->sector; |
1404 | long sectors_to_go = r1_bio->sectors; | |
1405 | /* make sure these bits doesn't get cleared. */ | |
1406 | do { | |
5e3db645 | 1407 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1408 | &sync_blocks, 1); |
1409 | s += sync_blocks; | |
1410 | sectors_to_go -= sync_blocks; | |
1411 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1412 | set_bit(WriteErrorSeen, |
1413 | &conf->mirrors[mirror].rdev->flags); | |
1414 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 N |
1415 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1416 | r1_bio->sector, | |
1417 | r1_bio->sectors, | |
3a9f28a5 N |
1418 | &first_bad, &bad_sectors) && |
1419 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1420 | r1_bio->sector, | |
1421 | r1_bio->sectors, | |
1422 | &first_bad, &bad_sectors) | |
1423 | ) | |
4367af55 | 1424 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1425 | |
1da177e4 | 1426 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1427 | int s = r1_bio->sectors; |
d8f05d29 N |
1428 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1429 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1430 | reschedule_retry(r1_bio); |
1431 | else { | |
1432 | put_buf(r1_bio); | |
1433 | md_done_sync(mddev, s, uptodate); | |
1434 | } | |
1da177e4 | 1435 | } |
1da177e4 LT |
1436 | } |
1437 | ||
3cb03002 | 1438 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1439 | int sectors, struct page *page, int rw) |
1440 | { | |
1441 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1442 | /* success */ | |
1443 | return 1; | |
1444 | if (rw == WRITE) | |
1445 | set_bit(WriteErrorSeen, &rdev->flags); | |
1446 | /* need to record an error - either for the block or the device */ | |
1447 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1448 | md_error(rdev->mddev, rdev); | |
1449 | return 0; | |
1450 | } | |
1451 | ||
9f2c9d12 | 1452 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1453 | { |
a68e5870 N |
1454 | /* Try some synchronous reads of other devices to get |
1455 | * good data, much like with normal read errors. Only | |
1456 | * read into the pages we already have so we don't | |
1457 | * need to re-issue the read request. | |
1458 | * We don't need to freeze the array, because being in an | |
1459 | * active sync request, there is no normal IO, and | |
1460 | * no overlapping syncs. | |
06f60385 N |
1461 | * We don't need to check is_badblock() again as we |
1462 | * made sure that anything with a bad block in range | |
1463 | * will have bi_end_io clear. | |
a68e5870 | 1464 | */ |
fd01b88c | 1465 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1466 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1467 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1468 | sector_t sect = r1_bio->sector; | |
1469 | int sectors = r1_bio->sectors; | |
1470 | int idx = 0; | |
1471 | ||
1472 | while(sectors) { | |
1473 | int s = sectors; | |
1474 | int d = r1_bio->read_disk; | |
1475 | int success = 0; | |
3cb03002 | 1476 | struct md_rdev *rdev; |
78d7f5f7 | 1477 | int start; |
a68e5870 N |
1478 | |
1479 | if (s > (PAGE_SIZE>>9)) | |
1480 | s = PAGE_SIZE >> 9; | |
1481 | do { | |
1482 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1483 | /* No rcu protection needed here devices | |
1484 | * can only be removed when no resync is | |
1485 | * active, and resync is currently active | |
1486 | */ | |
1487 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1488 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1489 | bio->bi_io_vec[idx].bv_page, |
1490 | READ, false)) { | |
1491 | success = 1; | |
1492 | break; | |
1493 | } | |
1494 | } | |
1495 | d++; | |
1496 | if (d == conf->raid_disks) | |
1497 | d = 0; | |
1498 | } while (!success && d != r1_bio->read_disk); | |
1499 | ||
78d7f5f7 | 1500 | if (!success) { |
a68e5870 | 1501 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1502 | int abort = 0; |
1503 | /* Cannot read from anywhere, this block is lost. | |
1504 | * Record a bad block on each device. If that doesn't | |
1505 | * work just disable and interrupt the recovery. | |
1506 | * Don't fail devices as that won't really help. | |
1507 | */ | |
a68e5870 N |
1508 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1509 | " for block %llu\n", | |
1510 | mdname(mddev), | |
1511 | bdevname(bio->bi_bdev, b), | |
1512 | (unsigned long long)r1_bio->sector); | |
3a9f28a5 N |
1513 | for (d = 0; d < conf->raid_disks; d++) { |
1514 | rdev = conf->mirrors[d].rdev; | |
1515 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1516 | continue; | |
1517 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1518 | abort = 1; | |
1519 | } | |
1520 | if (abort) { | |
d890fa2b N |
1521 | conf->recovery_disabled = |
1522 | mddev->recovery_disabled; | |
3a9f28a5 N |
1523 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1524 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1525 | put_buf(r1_bio); | |
1526 | return 0; | |
1527 | } | |
1528 | /* Try next page */ | |
1529 | sectors -= s; | |
1530 | sect += s; | |
1531 | idx++; | |
1532 | continue; | |
d11c171e | 1533 | } |
78d7f5f7 N |
1534 | |
1535 | start = d; | |
1536 | /* write it back and re-read */ | |
1537 | while (d != r1_bio->read_disk) { | |
1538 | if (d == 0) | |
1539 | d = conf->raid_disks; | |
1540 | d--; | |
1541 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1542 | continue; | |
1543 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1544 | if (r1_sync_page_io(rdev, sect, s, |
1545 | bio->bi_io_vec[idx].bv_page, | |
1546 | WRITE) == 0) { | |
78d7f5f7 N |
1547 | r1_bio->bios[d]->bi_end_io = NULL; |
1548 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1549 | } |
78d7f5f7 N |
1550 | } |
1551 | d = start; | |
1552 | while (d != r1_bio->read_disk) { | |
1553 | if (d == 0) | |
1554 | d = conf->raid_disks; | |
1555 | d--; | |
1556 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1557 | continue; | |
1558 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1559 | if (r1_sync_page_io(rdev, sect, s, |
1560 | bio->bi_io_vec[idx].bv_page, | |
1561 | READ) != 0) | |
9d3d8011 | 1562 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1563 | } |
a68e5870 N |
1564 | sectors -= s; |
1565 | sect += s; | |
1566 | idx ++; | |
1567 | } | |
78d7f5f7 | 1568 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1569 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1570 | return 1; |
1571 | } | |
1572 | ||
9f2c9d12 | 1573 | static int process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1574 | { |
1575 | /* We have read all readable devices. If we haven't | |
1576 | * got the block, then there is no hope left. | |
1577 | * If we have, then we want to do a comparison | |
1578 | * and skip the write if everything is the same. | |
1579 | * If any blocks failed to read, then we need to | |
1580 | * attempt an over-write | |
1581 | */ | |
fd01b88c | 1582 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1583 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1584 | int primary; |
1585 | int i; | |
1586 | ||
78d7f5f7 | 1587 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1588 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1589 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1590 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1591 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1592 | break; | |
1593 | } | |
1594 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1595 | for (i = 0; i < conf->raid_disks; i++) { |
1596 | int j; | |
1597 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1598 | struct bio *pbio = r1_bio->bios[primary]; | |
1599 | struct bio *sbio = r1_bio->bios[i]; | |
1600 | int size; | |
a68e5870 | 1601 | |
78d7f5f7 N |
1602 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1603 | continue; | |
1604 | ||
1605 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1606 | for (j = vcnt; j-- ; ) { | |
1607 | struct page *p, *s; | |
1608 | p = pbio->bi_io_vec[j].bv_page; | |
1609 | s = sbio->bi_io_vec[j].bv_page; | |
1610 | if (memcmp(page_address(p), | |
1611 | page_address(s), | |
1612 | PAGE_SIZE)) | |
1613 | break; | |
69382e85 | 1614 | } |
78d7f5f7 N |
1615 | } else |
1616 | j = 0; | |
1617 | if (j >= 0) | |
1618 | mddev->resync_mismatches += r1_bio->sectors; | |
1619 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1620 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1621 | /* No need to write to this device. */ | |
1622 | sbio->bi_end_io = NULL; | |
1623 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1624 | continue; | |
1625 | } | |
1626 | /* fixup the bio for reuse */ | |
1627 | sbio->bi_vcnt = vcnt; | |
1628 | sbio->bi_size = r1_bio->sectors << 9; | |
1629 | sbio->bi_idx = 0; | |
1630 | sbio->bi_phys_segments = 0; | |
1631 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1632 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1633 | sbio->bi_next = NULL; | |
1634 | sbio->bi_sector = r1_bio->sector + | |
1635 | conf->mirrors[i].rdev->data_offset; | |
1636 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1637 | size = sbio->bi_size; | |
1638 | for (j = 0; j < vcnt ; j++) { | |
1639 | struct bio_vec *bi; | |
1640 | bi = &sbio->bi_io_vec[j]; | |
1641 | bi->bv_offset = 0; | |
1642 | if (size > PAGE_SIZE) | |
1643 | bi->bv_len = PAGE_SIZE; | |
1644 | else | |
1645 | bi->bv_len = size; | |
1646 | size -= PAGE_SIZE; | |
1647 | memcpy(page_address(bi->bv_page), | |
1648 | page_address(pbio->bi_io_vec[j].bv_page), | |
1649 | PAGE_SIZE); | |
69382e85 | 1650 | } |
78d7f5f7 | 1651 | } |
a68e5870 N |
1652 | return 0; |
1653 | } | |
1654 | ||
9f2c9d12 | 1655 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 1656 | { |
e8096360 | 1657 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1658 | int i; |
1659 | int disks = conf->raid_disks; | |
1660 | struct bio *bio, *wbio; | |
1661 | ||
1662 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1663 | ||
a68e5870 N |
1664 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1665 | /* ouch - failed to read all of that. */ | |
1666 | if (!fix_sync_read_error(r1_bio)) | |
1667 | return; | |
7ca78d57 N |
1668 | |
1669 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1670 | if (process_checks(r1_bio) < 0) | |
1671 | return; | |
d11c171e N |
1672 | /* |
1673 | * schedule writes | |
1674 | */ | |
1da177e4 LT |
1675 | atomic_set(&r1_bio->remaining, 1); |
1676 | for (i = 0; i < disks ; i++) { | |
1677 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1678 | if (wbio->bi_end_io == NULL || |
1679 | (wbio->bi_end_io == end_sync_read && | |
1680 | (i == r1_bio->read_disk || | |
1681 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1682 | continue; |
1683 | ||
3e198f78 N |
1684 | wbio->bi_rw = WRITE; |
1685 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1686 | atomic_inc(&r1_bio->remaining); |
1687 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1688 | |
1da177e4 LT |
1689 | generic_make_request(wbio); |
1690 | } | |
1691 | ||
1692 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1693 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1694 | md_done_sync(mddev, r1_bio->sectors, 1); |
1695 | put_buf(r1_bio); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * This is a kernel thread which: | |
1701 | * | |
1702 | * 1. Retries failed read operations on working mirrors. | |
1703 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1704 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1705 | */ |
1706 | ||
e8096360 | 1707 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
1708 | sector_t sect, int sectors) |
1709 | { | |
fd01b88c | 1710 | struct mddev *mddev = conf->mddev; |
867868fb N |
1711 | while(sectors) { |
1712 | int s = sectors; | |
1713 | int d = read_disk; | |
1714 | int success = 0; | |
1715 | int start; | |
3cb03002 | 1716 | struct md_rdev *rdev; |
867868fb N |
1717 | |
1718 | if (s > (PAGE_SIZE>>9)) | |
1719 | s = PAGE_SIZE >> 9; | |
1720 | ||
1721 | do { | |
1722 | /* Note: no rcu protection needed here | |
1723 | * as this is synchronous in the raid1d thread | |
1724 | * which is the thread that might remove | |
1725 | * a device. If raid1d ever becomes multi-threaded.... | |
1726 | */ | |
d2eb35ac N |
1727 | sector_t first_bad; |
1728 | int bad_sectors; | |
1729 | ||
867868fb N |
1730 | rdev = conf->mirrors[d].rdev; |
1731 | if (rdev && | |
1732 | test_bit(In_sync, &rdev->flags) && | |
d2eb35ac N |
1733 | is_badblock(rdev, sect, s, |
1734 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
1735 | sync_page_io(rdev, sect, s<<9, |
1736 | conf->tmppage, READ, false)) | |
867868fb N |
1737 | success = 1; |
1738 | else { | |
1739 | d++; | |
1740 | if (d == conf->raid_disks) | |
1741 | d = 0; | |
1742 | } | |
1743 | } while (!success && d != read_disk); | |
1744 | ||
1745 | if (!success) { | |
d8f05d29 | 1746 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 1747 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
1748 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
1749 | md_error(mddev, rdev); | |
867868fb N |
1750 | break; |
1751 | } | |
1752 | /* write it back and re-read */ | |
1753 | start = d; | |
1754 | while (d != read_disk) { | |
1755 | if (d==0) | |
1756 | d = conf->raid_disks; | |
1757 | d--; | |
1758 | rdev = conf->mirrors[d].rdev; | |
1759 | if (rdev && | |
d8f05d29 N |
1760 | test_bit(In_sync, &rdev->flags)) |
1761 | r1_sync_page_io(rdev, sect, s, | |
1762 | conf->tmppage, WRITE); | |
867868fb N |
1763 | } |
1764 | d = start; | |
1765 | while (d != read_disk) { | |
1766 | char b[BDEVNAME_SIZE]; | |
1767 | if (d==0) | |
1768 | d = conf->raid_disks; | |
1769 | d--; | |
1770 | rdev = conf->mirrors[d].rdev; | |
1771 | if (rdev && | |
1772 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
1773 | if (r1_sync_page_io(rdev, sect, s, |
1774 | conf->tmppage, READ)) { | |
867868fb N |
1775 | atomic_add(s, &rdev->corrected_errors); |
1776 | printk(KERN_INFO | |
9dd1e2fa | 1777 | "md/raid1:%s: read error corrected " |
867868fb N |
1778 | "(%d sectors at %llu on %s)\n", |
1779 | mdname(mddev), s, | |
969b755a RD |
1780 | (unsigned long long)(sect + |
1781 | rdev->data_offset), | |
867868fb N |
1782 | bdevname(rdev->bdev, b)); |
1783 | } | |
1784 | } | |
1785 | } | |
1786 | sectors -= s; | |
1787 | sect += s; | |
1788 | } | |
1789 | } | |
1790 | ||
cd5ff9a1 N |
1791 | static void bi_complete(struct bio *bio, int error) |
1792 | { | |
1793 | complete((struct completion *)bio->bi_private); | |
1794 | } | |
1795 | ||
1796 | static int submit_bio_wait(int rw, struct bio *bio) | |
1797 | { | |
1798 | struct completion event; | |
1799 | rw |= REQ_SYNC; | |
1800 | ||
1801 | init_completion(&event); | |
1802 | bio->bi_private = &event; | |
1803 | bio->bi_end_io = bi_complete; | |
1804 | submit_bio(rw, bio); | |
1805 | wait_for_completion(&event); | |
1806 | ||
1807 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1808 | } | |
1809 | ||
9f2c9d12 | 1810 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 1811 | { |
fd01b88c | 1812 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1813 | struct r1conf *conf = mddev->private; |
3cb03002 | 1814 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
1815 | int vcnt, idx; |
1816 | struct bio_vec *vec; | |
1817 | ||
1818 | /* bio has the data to be written to device 'i' where | |
1819 | * we just recently had a write error. | |
1820 | * We repeatedly clone the bio and trim down to one block, | |
1821 | * then try the write. Where the write fails we record | |
1822 | * a bad block. | |
1823 | * It is conceivable that the bio doesn't exactly align with | |
1824 | * blocks. We must handle this somehow. | |
1825 | * | |
1826 | * We currently own a reference on the rdev. | |
1827 | */ | |
1828 | ||
1829 | int block_sectors; | |
1830 | sector_t sector; | |
1831 | int sectors; | |
1832 | int sect_to_write = r1_bio->sectors; | |
1833 | int ok = 1; | |
1834 | ||
1835 | if (rdev->badblocks.shift < 0) | |
1836 | return 0; | |
1837 | ||
1838 | block_sectors = 1 << rdev->badblocks.shift; | |
1839 | sector = r1_bio->sector; | |
1840 | sectors = ((sector + block_sectors) | |
1841 | & ~(sector_t)(block_sectors - 1)) | |
1842 | - sector; | |
1843 | ||
1844 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
1845 | vcnt = r1_bio->behind_page_count; | |
1846 | vec = r1_bio->behind_bvecs; | |
1847 | idx = 0; | |
1848 | while (vec[idx].bv_page == NULL) | |
1849 | idx++; | |
1850 | } else { | |
1851 | vcnt = r1_bio->master_bio->bi_vcnt; | |
1852 | vec = r1_bio->master_bio->bi_io_vec; | |
1853 | idx = r1_bio->master_bio->bi_idx; | |
1854 | } | |
1855 | while (sect_to_write) { | |
1856 | struct bio *wbio; | |
1857 | if (sectors > sect_to_write) | |
1858 | sectors = sect_to_write; | |
1859 | /* Write at 'sector' for 'sectors'*/ | |
1860 | ||
1861 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
1862 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
1863 | wbio->bi_sector = r1_bio->sector; | |
1864 | wbio->bi_rw = WRITE; | |
1865 | wbio->bi_vcnt = vcnt; | |
1866 | wbio->bi_size = r1_bio->sectors << 9; | |
1867 | wbio->bi_idx = idx; | |
1868 | ||
1869 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
1870 | wbio->bi_sector += rdev->data_offset; | |
1871 | wbio->bi_bdev = rdev->bdev; | |
1872 | if (submit_bio_wait(WRITE, wbio) == 0) | |
1873 | /* failure! */ | |
1874 | ok = rdev_set_badblocks(rdev, sector, | |
1875 | sectors, 0) | |
1876 | && ok; | |
1877 | ||
1878 | bio_put(wbio); | |
1879 | sect_to_write -= sectors; | |
1880 | sector += sectors; | |
1881 | sectors = block_sectors; | |
1882 | } | |
1883 | return ok; | |
1884 | } | |
1885 | ||
e8096360 | 1886 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
1887 | { |
1888 | int m; | |
1889 | int s = r1_bio->sectors; | |
1890 | for (m = 0; m < conf->raid_disks ; m++) { | |
3cb03002 | 1891 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
1892 | struct bio *bio = r1_bio->bios[m]; |
1893 | if (bio->bi_end_io == NULL) | |
1894 | continue; | |
1895 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1896 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
1897 | rdev_clear_badblocks(rdev, r1_bio->sector, s); | |
1898 | } | |
1899 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1900 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
1901 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
1902 | md_error(conf->mddev, rdev); | |
1903 | } | |
1904 | } | |
1905 | put_buf(r1_bio); | |
1906 | md_done_sync(conf->mddev, s, 1); | |
1907 | } | |
1908 | ||
e8096360 | 1909 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
1910 | { |
1911 | int m; | |
1912 | for (m = 0; m < conf->raid_disks ; m++) | |
1913 | if (r1_bio->bios[m] == IO_MADE_GOOD) { | |
3cb03002 | 1914 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
1915 | rdev_clear_badblocks(rdev, |
1916 | r1_bio->sector, | |
1917 | r1_bio->sectors); | |
1918 | rdev_dec_pending(rdev, conf->mddev); | |
1919 | } else if (r1_bio->bios[m] != NULL) { | |
1920 | /* This drive got a write error. We need to | |
1921 | * narrow down and record precise write | |
1922 | * errors. | |
1923 | */ | |
1924 | if (!narrow_write_error(r1_bio, m)) { | |
1925 | md_error(conf->mddev, | |
1926 | conf->mirrors[m].rdev); | |
1927 | /* an I/O failed, we can't clear the bitmap */ | |
1928 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1929 | } | |
1930 | rdev_dec_pending(conf->mirrors[m].rdev, | |
1931 | conf->mddev); | |
1932 | } | |
1933 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1934 | close_write(r1_bio); | |
1935 | raid_end_bio_io(r1_bio); | |
1936 | } | |
1937 | ||
e8096360 | 1938 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
1939 | { |
1940 | int disk; | |
1941 | int max_sectors; | |
fd01b88c | 1942 | struct mddev *mddev = conf->mddev; |
62096bce N |
1943 | struct bio *bio; |
1944 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1945 | struct md_rdev *rdev; |
62096bce N |
1946 | |
1947 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
1948 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1949 | * the block and we can fix it. | |
1950 | * We freeze all other IO, and try reading the block from | |
1951 | * other devices. When we find one, we re-write | |
1952 | * and check it that fixes the read error. | |
1953 | * This is all done synchronously while the array is | |
1954 | * frozen | |
1955 | */ | |
1956 | if (mddev->ro == 0) { | |
1957 | freeze_array(conf); | |
1958 | fix_read_error(conf, r1_bio->read_disk, | |
1959 | r1_bio->sector, r1_bio->sectors); | |
1960 | unfreeze_array(conf); | |
1961 | } else | |
1962 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1963 | ||
1964 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1965 | bdevname(bio->bi_bdev, b); | |
1966 | read_more: | |
1967 | disk = read_balance(conf, r1_bio, &max_sectors); | |
1968 | if (disk == -1) { | |
1969 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
1970 | " read error for block %llu\n", | |
1971 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
1972 | raid_end_bio_io(r1_bio); | |
1973 | } else { | |
1974 | const unsigned long do_sync | |
1975 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
1976 | if (bio) { | |
1977 | r1_bio->bios[r1_bio->read_disk] = | |
1978 | mddev->ro ? IO_BLOCKED : NULL; | |
1979 | bio_put(bio); | |
1980 | } | |
1981 | r1_bio->read_disk = disk; | |
1982 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
1983 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
1984 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1985 | rdev = conf->mirrors[disk].rdev; | |
1986 | printk_ratelimited(KERN_ERR | |
1987 | "md/raid1:%s: redirecting sector %llu" | |
1988 | " to other mirror: %s\n", | |
1989 | mdname(mddev), | |
1990 | (unsigned long long)r1_bio->sector, | |
1991 | bdevname(rdev->bdev, b)); | |
1992 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1993 | bio->bi_bdev = rdev->bdev; | |
1994 | bio->bi_end_io = raid1_end_read_request; | |
1995 | bio->bi_rw = READ | do_sync; | |
1996 | bio->bi_private = r1_bio; | |
1997 | if (max_sectors < r1_bio->sectors) { | |
1998 | /* Drat - have to split this up more */ | |
1999 | struct bio *mbio = r1_bio->master_bio; | |
2000 | int sectors_handled = (r1_bio->sector + max_sectors | |
2001 | - mbio->bi_sector); | |
2002 | r1_bio->sectors = max_sectors; | |
2003 | spin_lock_irq(&conf->device_lock); | |
2004 | if (mbio->bi_phys_segments == 0) | |
2005 | mbio->bi_phys_segments = 2; | |
2006 | else | |
2007 | mbio->bi_phys_segments++; | |
2008 | spin_unlock_irq(&conf->device_lock); | |
2009 | generic_make_request(bio); | |
2010 | bio = NULL; | |
2011 | ||
2012 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2013 | ||
2014 | r1_bio->master_bio = mbio; | |
2015 | r1_bio->sectors = (mbio->bi_size >> 9) | |
2016 | - sectors_handled; | |
2017 | r1_bio->state = 0; | |
2018 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2019 | r1_bio->mddev = mddev; | |
2020 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2021 | ||
2022 | goto read_more; | |
2023 | } else | |
2024 | generic_make_request(bio); | |
2025 | } | |
2026 | } | |
2027 | ||
fd01b88c | 2028 | static void raid1d(struct mddev *mddev) |
1da177e4 | 2029 | { |
9f2c9d12 | 2030 | struct r1bio *r1_bio; |
1da177e4 | 2031 | unsigned long flags; |
e8096360 | 2032 | struct r1conf *conf = mddev->private; |
1da177e4 | 2033 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2034 | struct blk_plug plug; |
1da177e4 LT |
2035 | |
2036 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2037 | |
2038 | blk_start_plug(&plug); | |
1da177e4 | 2039 | for (;;) { |
191ea9b2 | 2040 | |
c3b328ac N |
2041 | if (atomic_read(&mddev->plug_cnt) == 0) |
2042 | flush_pending_writes(conf); | |
191ea9b2 | 2043 | |
a35e63ef N |
2044 | spin_lock_irqsave(&conf->device_lock, flags); |
2045 | if (list_empty(head)) { | |
2046 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2047 | break; |
a35e63ef | 2048 | } |
9f2c9d12 | 2049 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2050 | list_del(head->prev); |
ddaf22ab | 2051 | conf->nr_queued--; |
1da177e4 LT |
2052 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2053 | ||
2054 | mddev = r1_bio->mddev; | |
070ec55d | 2055 | conf = mddev->private; |
4367af55 | 2056 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2057 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2058 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2059 | handle_sync_write_finished(conf, r1_bio); | |
2060 | else | |
4367af55 | 2061 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2062 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2063 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2064 | handle_write_finished(conf, r1_bio); | |
2065 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2066 | handle_read_error(conf, r1_bio); | |
2067 | else | |
d2eb35ac N |
2068 | /* just a partial read to be scheduled from separate |
2069 | * context | |
2070 | */ | |
2071 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2072 | |
1d9d5241 | 2073 | cond_resched(); |
de393cde N |
2074 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2075 | md_check_recovery(mddev); | |
1da177e4 | 2076 | } |
e1dfa0a2 | 2077 | blk_finish_plug(&plug); |
1da177e4 LT |
2078 | } |
2079 | ||
2080 | ||
e8096360 | 2081 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2082 | { |
2083 | int buffs; | |
2084 | ||
2085 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2086 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2087 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2088 | conf->poolinfo); | |
2089 | if (!conf->r1buf_pool) | |
2090 | return -ENOMEM; | |
2091 | conf->next_resync = 0; | |
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | /* | |
2096 | * perform a "sync" on one "block" | |
2097 | * | |
2098 | * We need to make sure that no normal I/O request - particularly write | |
2099 | * requests - conflict with active sync requests. | |
2100 | * | |
2101 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2102 | * that can be installed to exclude normal IO requests. | |
2103 | */ | |
2104 | ||
fd01b88c | 2105 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2106 | { |
e8096360 | 2107 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2108 | struct r1bio *r1_bio; |
1da177e4 LT |
2109 | struct bio *bio; |
2110 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2111 | int disk = -1; |
1da177e4 | 2112 | int i; |
3e198f78 N |
2113 | int wonly = -1; |
2114 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2115 | sector_t sync_blocks; |
e3b9703e | 2116 | int still_degraded = 0; |
06f60385 N |
2117 | int good_sectors = RESYNC_SECTORS; |
2118 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2119 | |
2120 | if (!conf->r1buf_pool) | |
2121 | if (init_resync(conf)) | |
57afd89f | 2122 | return 0; |
1da177e4 | 2123 | |
58c0fed4 | 2124 | max_sector = mddev->dev_sectors; |
1da177e4 | 2125 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2126 | /* If we aborted, we need to abort the |
2127 | * sync on the 'current' bitmap chunk (there will | |
2128 | * only be one in raid1 resync. | |
2129 | * We can find the current addess in mddev->curr_resync | |
2130 | */ | |
6a806c51 N |
2131 | if (mddev->curr_resync < max_sector) /* aborted */ |
2132 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2133 | &sync_blocks, 1); |
6a806c51 | 2134 | else /* completed sync */ |
191ea9b2 | 2135 | conf->fullsync = 0; |
6a806c51 N |
2136 | |
2137 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2138 | close_sync(conf); |
2139 | return 0; | |
2140 | } | |
2141 | ||
07d84d10 N |
2142 | if (mddev->bitmap == NULL && |
2143 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2144 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2145 | conf->fullsync == 0) { |
2146 | *skipped = 1; | |
2147 | return max_sector - sector_nr; | |
2148 | } | |
6394cca5 N |
2149 | /* before building a request, check if we can skip these blocks.. |
2150 | * This call the bitmap_start_sync doesn't actually record anything | |
2151 | */ | |
e3b9703e | 2152 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2153 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2154 | /* We can skip this block, and probably several more */ |
2155 | *skipped = 1; | |
2156 | return sync_blocks; | |
2157 | } | |
1da177e4 | 2158 | /* |
17999be4 N |
2159 | * If there is non-resync activity waiting for a turn, |
2160 | * and resync is going fast enough, | |
2161 | * then let it though before starting on this new sync request. | |
1da177e4 | 2162 | */ |
17999be4 | 2163 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2164 | msleep_interruptible(1000); |
17999be4 | 2165 | |
b47490c9 | 2166 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2167 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2168 | raise_barrier(conf); |
2169 | ||
2170 | conf->next_resync = sector_nr; | |
1da177e4 | 2171 | |
3e198f78 | 2172 | rcu_read_lock(); |
1da177e4 | 2173 | /* |
3e198f78 N |
2174 | * If we get a correctably read error during resync or recovery, |
2175 | * we might want to read from a different device. So we | |
2176 | * flag all drives that could conceivably be read from for READ, | |
2177 | * and any others (which will be non-In_sync devices) for WRITE. | |
2178 | * If a read fails, we try reading from something else for which READ | |
2179 | * is OK. | |
1da177e4 | 2180 | */ |
1da177e4 | 2181 | |
1da177e4 LT |
2182 | r1_bio->mddev = mddev; |
2183 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2184 | r1_bio->state = 0; |
1da177e4 | 2185 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
2186 | |
2187 | for (i=0; i < conf->raid_disks; i++) { | |
3cb03002 | 2188 | struct md_rdev *rdev; |
1da177e4 LT |
2189 | bio = r1_bio->bios[i]; |
2190 | ||
2191 | /* take from bio_init */ | |
2192 | bio->bi_next = NULL; | |
db8d9d35 | 2193 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2194 | bio->bi_flags |= 1 << BIO_UPTODATE; |
802ba064 | 2195 | bio->bi_rw = READ; |
1da177e4 LT |
2196 | bio->bi_vcnt = 0; |
2197 | bio->bi_idx = 0; | |
2198 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2199 | bio->bi_size = 0; |
2200 | bio->bi_end_io = NULL; | |
2201 | bio->bi_private = NULL; | |
2202 | ||
3e198f78 N |
2203 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2204 | if (rdev == NULL || | |
06f60385 | 2205 | test_bit(Faulty, &rdev->flags)) { |
e3b9703e | 2206 | still_degraded = 1; |
3e198f78 | 2207 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2208 | bio->bi_rw = WRITE; |
2209 | bio->bi_end_io = end_sync_write; | |
2210 | write_targets ++; | |
3e198f78 N |
2211 | } else { |
2212 | /* may need to read from here */ | |
06f60385 N |
2213 | sector_t first_bad = MaxSector; |
2214 | int bad_sectors; | |
2215 | ||
2216 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2217 | &first_bad, &bad_sectors)) { | |
2218 | if (first_bad > sector_nr) | |
2219 | good_sectors = first_bad - sector_nr; | |
2220 | else { | |
2221 | bad_sectors -= (sector_nr - first_bad); | |
2222 | if (min_bad == 0 || | |
2223 | min_bad > bad_sectors) | |
2224 | min_bad = bad_sectors; | |
2225 | } | |
2226 | } | |
2227 | if (sector_nr < first_bad) { | |
2228 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2229 | if (wonly < 0) | |
2230 | wonly = i; | |
2231 | } else { | |
2232 | if (disk < 0) | |
2233 | disk = i; | |
2234 | } | |
2235 | bio->bi_rw = READ; | |
2236 | bio->bi_end_io = end_sync_read; | |
2237 | read_targets++; | |
3e198f78 | 2238 | } |
3e198f78 | 2239 | } |
06f60385 N |
2240 | if (bio->bi_end_io) { |
2241 | atomic_inc(&rdev->nr_pending); | |
2242 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2243 | bio->bi_bdev = rdev->bdev; | |
2244 | bio->bi_private = r1_bio; | |
2245 | } | |
1da177e4 | 2246 | } |
3e198f78 N |
2247 | rcu_read_unlock(); |
2248 | if (disk < 0) | |
2249 | disk = wonly; | |
2250 | r1_bio->read_disk = disk; | |
191ea9b2 | 2251 | |
06f60385 N |
2252 | if (read_targets == 0 && min_bad > 0) { |
2253 | /* These sectors are bad on all InSync devices, so we | |
2254 | * need to mark them bad on all write targets | |
2255 | */ | |
2256 | int ok = 1; | |
2257 | for (i = 0 ; i < conf->raid_disks ; i++) | |
2258 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { | |
3cb03002 | 2259 | struct md_rdev *rdev = |
06f60385 N |
2260 | rcu_dereference(conf->mirrors[i].rdev); |
2261 | ok = rdev_set_badblocks(rdev, sector_nr, | |
2262 | min_bad, 0 | |
2263 | ) && ok; | |
2264 | } | |
2265 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2266 | *skipped = 1; | |
2267 | put_buf(r1_bio); | |
2268 | ||
2269 | if (!ok) { | |
2270 | /* Cannot record the badblocks, so need to | |
2271 | * abort the resync. | |
2272 | * If there are multiple read targets, could just | |
2273 | * fail the really bad ones ??? | |
2274 | */ | |
2275 | conf->recovery_disabled = mddev->recovery_disabled; | |
2276 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2277 | return 0; | |
2278 | } else | |
2279 | return min_bad; | |
2280 | ||
2281 | } | |
2282 | if (min_bad > 0 && min_bad < good_sectors) { | |
2283 | /* only resync enough to reach the next bad->good | |
2284 | * transition */ | |
2285 | good_sectors = min_bad; | |
2286 | } | |
2287 | ||
3e198f78 N |
2288 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2289 | /* extra read targets are also write targets */ | |
2290 | write_targets += read_targets-1; | |
2291 | ||
2292 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2293 | /* There is nowhere to write, so all non-sync |
2294 | * drives must be failed - so we are finished | |
2295 | */ | |
57afd89f N |
2296 | sector_t rv = max_sector - sector_nr; |
2297 | *skipped = 1; | |
1da177e4 | 2298 | put_buf(r1_bio); |
1da177e4 LT |
2299 | return rv; |
2300 | } | |
2301 | ||
c6207277 N |
2302 | if (max_sector > mddev->resync_max) |
2303 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2304 | if (max_sector > sector_nr + good_sectors) |
2305 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2306 | nr_sectors = 0; |
289e99e8 | 2307 | sync_blocks = 0; |
1da177e4 LT |
2308 | do { |
2309 | struct page *page; | |
2310 | int len = PAGE_SIZE; | |
2311 | if (sector_nr + (len>>9) > max_sector) | |
2312 | len = (max_sector - sector_nr) << 9; | |
2313 | if (len == 0) | |
2314 | break; | |
6a806c51 N |
2315 | if (sync_blocks == 0) { |
2316 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2317 | &sync_blocks, still_degraded) && |
2318 | !conf->fullsync && | |
2319 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2320 | break; |
9e77c485 | 2321 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2322 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2323 | len = sync_blocks<<9; |
ab7a30c7 | 2324 | } |
191ea9b2 | 2325 | |
1da177e4 LT |
2326 | for (i=0 ; i < conf->raid_disks; i++) { |
2327 | bio = r1_bio->bios[i]; | |
2328 | if (bio->bi_end_io) { | |
d11c171e | 2329 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2330 | if (bio_add_page(bio, page, len, 0) == 0) { |
2331 | /* stop here */ | |
d11c171e | 2332 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2333 | while (i > 0) { |
2334 | i--; | |
2335 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2336 | if (bio->bi_end_io==NULL) |
2337 | continue; | |
1da177e4 LT |
2338 | /* remove last page from this bio */ |
2339 | bio->bi_vcnt--; | |
2340 | bio->bi_size -= len; | |
2341 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2342 | } | |
2343 | goto bio_full; | |
2344 | } | |
2345 | } | |
2346 | } | |
2347 | nr_sectors += len>>9; | |
2348 | sector_nr += len>>9; | |
191ea9b2 | 2349 | sync_blocks -= (len>>9); |
1da177e4 LT |
2350 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2351 | bio_full: | |
1da177e4 LT |
2352 | r1_bio->sectors = nr_sectors; |
2353 | ||
d11c171e N |
2354 | /* For a user-requested sync, we read all readable devices and do a |
2355 | * compare | |
2356 | */ | |
2357 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2358 | atomic_set(&r1_bio->remaining, read_targets); | |
2359 | for (i=0; i<conf->raid_disks; i++) { | |
2360 | bio = r1_bio->bios[i]; | |
2361 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 2362 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2363 | generic_make_request(bio); |
2364 | } | |
2365 | } | |
2366 | } else { | |
2367 | atomic_set(&r1_bio->remaining, 1); | |
2368 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2369 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2370 | generic_make_request(bio); |
1da177e4 | 2371 | |
d11c171e | 2372 | } |
1da177e4 LT |
2373 | return nr_sectors; |
2374 | } | |
2375 | ||
fd01b88c | 2376 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2377 | { |
2378 | if (sectors) | |
2379 | return sectors; | |
2380 | ||
2381 | return mddev->dev_sectors; | |
2382 | } | |
2383 | ||
e8096360 | 2384 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2385 | { |
e8096360 | 2386 | struct r1conf *conf; |
709ae487 | 2387 | int i; |
0f6d02d5 | 2388 | struct mirror_info *disk; |
3cb03002 | 2389 | struct md_rdev *rdev; |
709ae487 | 2390 | int err = -ENOMEM; |
1da177e4 | 2391 | |
e8096360 | 2392 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2393 | if (!conf) |
709ae487 | 2394 | goto abort; |
1da177e4 | 2395 | |
9ffae0cf | 2396 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
2397 | GFP_KERNEL); |
2398 | if (!conf->mirrors) | |
709ae487 | 2399 | goto abort; |
1da177e4 | 2400 | |
ddaf22ab N |
2401 | conf->tmppage = alloc_page(GFP_KERNEL); |
2402 | if (!conf->tmppage) | |
709ae487 | 2403 | goto abort; |
ddaf22ab | 2404 | |
709ae487 | 2405 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2406 | if (!conf->poolinfo) |
709ae487 | 2407 | goto abort; |
1da177e4 LT |
2408 | conf->poolinfo->raid_disks = mddev->raid_disks; |
2409 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2410 | r1bio_pool_free, | |
2411 | conf->poolinfo); | |
2412 | if (!conf->r1bio_pool) | |
709ae487 N |
2413 | goto abort; |
2414 | ||
ed9bfdf1 | 2415 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2416 | |
e7e72bf6 | 2417 | spin_lock_init(&conf->device_lock); |
159ec1fc | 2418 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 2419 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2420 | if (disk_idx >= mddev->raid_disks |
2421 | || disk_idx < 0) | |
2422 | continue; | |
2423 | disk = conf->mirrors + disk_idx; | |
2424 | ||
2425 | disk->rdev = rdev; | |
1da177e4 LT |
2426 | |
2427 | disk->head_position = 0; | |
1da177e4 LT |
2428 | } |
2429 | conf->raid_disks = mddev->raid_disks; | |
2430 | conf->mddev = mddev; | |
1da177e4 | 2431 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2432 | |
2433 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2434 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2435 | |
191ea9b2 | 2436 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2437 | conf->pending_count = 0; |
d890fa2b | 2438 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2439 | |
709ae487 | 2440 | conf->last_used = -1; |
1da177e4 LT |
2441 | for (i = 0; i < conf->raid_disks; i++) { |
2442 | ||
2443 | disk = conf->mirrors + i; | |
2444 | ||
5fd6c1dc N |
2445 | if (!disk->rdev || |
2446 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2447 | disk->head_position = 0; |
918f0238 N |
2448 | if (disk->rdev) |
2449 | conf->fullsync = 1; | |
709ae487 N |
2450 | } else if (conf->last_used < 0) |
2451 | /* | |
2452 | * The first working device is used as a | |
2453 | * starting point to read balancing. | |
2454 | */ | |
2455 | conf->last_used = i; | |
1da177e4 | 2456 | } |
709ae487 N |
2457 | |
2458 | err = -EIO; | |
2459 | if (conf->last_used < 0) { | |
9dd1e2fa | 2460 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
2461 | mdname(mddev)); |
2462 | goto abort; | |
2463 | } | |
2464 | err = -ENOMEM; | |
2465 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
2466 | if (!conf->thread) { | |
2467 | printk(KERN_ERR | |
9dd1e2fa | 2468 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2469 | mdname(mddev)); |
2470 | goto abort; | |
11ce99e6 | 2471 | } |
1da177e4 | 2472 | |
709ae487 N |
2473 | return conf; |
2474 | ||
2475 | abort: | |
2476 | if (conf) { | |
2477 | if (conf->r1bio_pool) | |
2478 | mempool_destroy(conf->r1bio_pool); | |
2479 | kfree(conf->mirrors); | |
2480 | safe_put_page(conf->tmppage); | |
2481 | kfree(conf->poolinfo); | |
2482 | kfree(conf); | |
2483 | } | |
2484 | return ERR_PTR(err); | |
2485 | } | |
2486 | ||
fd01b88c | 2487 | static int run(struct mddev *mddev) |
709ae487 | 2488 | { |
e8096360 | 2489 | struct r1conf *conf; |
709ae487 | 2490 | int i; |
3cb03002 | 2491 | struct md_rdev *rdev; |
709ae487 N |
2492 | |
2493 | if (mddev->level != 1) { | |
9dd1e2fa | 2494 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2495 | mdname(mddev), mddev->level); |
2496 | return -EIO; | |
2497 | } | |
2498 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2499 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2500 | mdname(mddev)); |
2501 | return -EIO; | |
2502 | } | |
1da177e4 | 2503 | /* |
709ae487 N |
2504 | * copy the already verified devices into our private RAID1 |
2505 | * bookkeeping area. [whatever we allocate in run(), | |
2506 | * should be freed in stop()] | |
1da177e4 | 2507 | */ |
709ae487 N |
2508 | if (mddev->private == NULL) |
2509 | conf = setup_conf(mddev); | |
2510 | else | |
2511 | conf = mddev->private; | |
1da177e4 | 2512 | |
709ae487 N |
2513 | if (IS_ERR(conf)) |
2514 | return PTR_ERR(conf); | |
1da177e4 | 2515 | |
709ae487 | 2516 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1ed7242e JB |
2517 | if (!mddev->gendisk) |
2518 | continue; | |
709ae487 N |
2519 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2520 | rdev->data_offset << 9); | |
2521 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
2522 | * violating it, so limit ->max_segments to 1 lying within |
2523 | * a single page, as a one page request is never in violation. | |
709ae487 | 2524 | */ |
627a2d3c N |
2525 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
2526 | blk_queue_max_segments(mddev->queue, 1); | |
2527 | blk_queue_segment_boundary(mddev->queue, | |
2528 | PAGE_CACHE_SIZE - 1); | |
2529 | } | |
1da177e4 | 2530 | } |
191ea9b2 | 2531 | |
709ae487 N |
2532 | mddev->degraded = 0; |
2533 | for (i=0; i < conf->raid_disks; i++) | |
2534 | if (conf->mirrors[i].rdev == NULL || | |
2535 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2536 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2537 | mddev->degraded++; | |
2538 | ||
2539 | if (conf->raid_disks - mddev->degraded == 1) | |
2540 | mddev->recovery_cp = MaxSector; | |
2541 | ||
8c6ac868 | 2542 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2543 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2544 | " -- starting background reconstruction\n", |
2545 | mdname(mddev)); | |
1da177e4 | 2546 | printk(KERN_INFO |
9dd1e2fa | 2547 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2548 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2549 | mddev->raid_disks); | |
709ae487 | 2550 | |
1da177e4 LT |
2551 | /* |
2552 | * Ok, everything is just fine now | |
2553 | */ | |
709ae487 N |
2554 | mddev->thread = conf->thread; |
2555 | conf->thread = NULL; | |
2556 | mddev->private = conf; | |
2557 | ||
1f403624 | 2558 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2559 | |
1ed7242e JB |
2560 | if (mddev->queue) { |
2561 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2562 | mddev->queue->backing_dev_info.congested_data = mddev; | |
2563 | } | |
a91a2785 | 2564 | return md_integrity_register(mddev); |
1da177e4 LT |
2565 | } |
2566 | ||
fd01b88c | 2567 | static int stop(struct mddev *mddev) |
1da177e4 | 2568 | { |
e8096360 | 2569 | struct r1conf *conf = mddev->private; |
4b6d287f | 2570 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2571 | |
2572 | /* wait for behind writes to complete */ | |
e555190d | 2573 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2574 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2575 | mdname(mddev)); | |
4b6d287f | 2576 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2577 | wait_event(bitmap->behind_wait, |
2578 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2579 | } |
1da177e4 | 2580 | |
409c57f3 N |
2581 | raise_barrier(conf); |
2582 | lower_barrier(conf); | |
2583 | ||
01f96c0a | 2584 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2585 | if (conf->r1bio_pool) |
2586 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2587 | kfree(conf->mirrors); |
2588 | kfree(conf->poolinfo); | |
1da177e4 LT |
2589 | kfree(conf); |
2590 | mddev->private = NULL; | |
2591 | return 0; | |
2592 | } | |
2593 | ||
fd01b88c | 2594 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2595 | { |
2596 | /* no resync is happening, and there is enough space | |
2597 | * on all devices, so we can resize. | |
2598 | * We need to make sure resync covers any new space. | |
2599 | * If the array is shrinking we should possibly wait until | |
2600 | * any io in the removed space completes, but it hardly seems | |
2601 | * worth it. | |
2602 | */ | |
1f403624 | 2603 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2604 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2605 | return -EINVAL; | |
f233ea5c | 2606 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2607 | revalidate_disk(mddev->gendisk); |
b522adcd | 2608 | if (sectors > mddev->dev_sectors && |
b098636c | 2609 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2610 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2611 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2612 | } | |
b522adcd | 2613 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2614 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2615 | return 0; |
2616 | } | |
2617 | ||
fd01b88c | 2618 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
2619 | { |
2620 | /* We need to: | |
2621 | * 1/ resize the r1bio_pool | |
2622 | * 2/ resize conf->mirrors | |
2623 | * | |
2624 | * We allocate a new r1bio_pool if we can. | |
2625 | * Then raise a device barrier and wait until all IO stops. | |
2626 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2627 | * |
2628 | * At the same time, we "pack" the devices so that all the missing | |
2629 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2630 | */ |
2631 | mempool_t *newpool, *oldpool; | |
2632 | struct pool_info *newpoolinfo; | |
0f6d02d5 | 2633 | struct mirror_info *newmirrors; |
e8096360 | 2634 | struct r1conf *conf = mddev->private; |
63c70c4f | 2635 | int cnt, raid_disks; |
c04be0aa | 2636 | unsigned long flags; |
b5470dc5 | 2637 | int d, d2, err; |
1da177e4 | 2638 | |
63c70c4f | 2639 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2640 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2641 | mddev->layout != mddev->new_layout || |
2642 | mddev->level != mddev->new_level) { | |
664e7c41 | 2643 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2644 | mddev->new_layout = mddev->layout; |
2645 | mddev->new_level = mddev->level; | |
2646 | return -EINVAL; | |
2647 | } | |
2648 | ||
b5470dc5 DW |
2649 | err = md_allow_write(mddev); |
2650 | if (err) | |
2651 | return err; | |
2a2275d6 | 2652 | |
63c70c4f N |
2653 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2654 | ||
6ea9c07c N |
2655 | if (raid_disks < conf->raid_disks) { |
2656 | cnt=0; | |
2657 | for (d= 0; d < conf->raid_disks; d++) | |
2658 | if (conf->mirrors[d].rdev) | |
2659 | cnt++; | |
2660 | if (cnt > raid_disks) | |
1da177e4 | 2661 | return -EBUSY; |
6ea9c07c | 2662 | } |
1da177e4 LT |
2663 | |
2664 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2665 | if (!newpoolinfo) | |
2666 | return -ENOMEM; | |
2667 | newpoolinfo->mddev = mddev; | |
2668 | newpoolinfo->raid_disks = raid_disks; | |
2669 | ||
2670 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2671 | r1bio_pool_free, newpoolinfo); | |
2672 | if (!newpool) { | |
2673 | kfree(newpoolinfo); | |
2674 | return -ENOMEM; | |
2675 | } | |
9ffae0cf | 2676 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2677 | if (!newmirrors) { |
2678 | kfree(newpoolinfo); | |
2679 | mempool_destroy(newpool); | |
2680 | return -ENOMEM; | |
2681 | } | |
1da177e4 | 2682 | |
17999be4 | 2683 | raise_barrier(conf); |
1da177e4 LT |
2684 | |
2685 | /* ok, everything is stopped */ | |
2686 | oldpool = conf->r1bio_pool; | |
2687 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2688 | |
a88aa786 | 2689 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 2690 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 2691 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 2692 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2693 | rdev->raid_disk = d2; |
36fad858 NK |
2694 | sysfs_unlink_rdev(mddev, rdev); |
2695 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2696 | printk(KERN_WARNING |
36fad858 NK |
2697 | "md/raid1:%s: cannot register rd%d\n", |
2698 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2699 | } |
a88aa786 N |
2700 | if (rdev) |
2701 | newmirrors[d2++].rdev = rdev; | |
2702 | } | |
1da177e4 LT |
2703 | kfree(conf->mirrors); |
2704 | conf->mirrors = newmirrors; | |
2705 | kfree(conf->poolinfo); | |
2706 | conf->poolinfo = newpoolinfo; | |
2707 | ||
c04be0aa | 2708 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2709 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2710 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2711 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2712 | mddev->delta_disks = 0; |
1da177e4 | 2713 | |
6ea9c07c | 2714 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2715 | lower_barrier(conf); |
1da177e4 LT |
2716 | |
2717 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2718 | md_wakeup_thread(mddev->thread); | |
2719 | ||
2720 | mempool_destroy(oldpool); | |
2721 | return 0; | |
2722 | } | |
2723 | ||
fd01b88c | 2724 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 2725 | { |
e8096360 | 2726 | struct r1conf *conf = mddev->private; |
36fa3063 N |
2727 | |
2728 | switch(state) { | |
6eef4b21 N |
2729 | case 2: /* wake for suspend */ |
2730 | wake_up(&conf->wait_barrier); | |
2731 | break; | |
9e6603da | 2732 | case 1: |
17999be4 | 2733 | raise_barrier(conf); |
36fa3063 | 2734 | break; |
9e6603da | 2735 | case 0: |
17999be4 | 2736 | lower_barrier(conf); |
36fa3063 N |
2737 | break; |
2738 | } | |
36fa3063 N |
2739 | } |
2740 | ||
fd01b88c | 2741 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
2742 | { |
2743 | /* raid1 can take over: | |
2744 | * raid5 with 2 devices, any layout or chunk size | |
2745 | */ | |
2746 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 2747 | struct r1conf *conf; |
709ae487 N |
2748 | mddev->new_level = 1; |
2749 | mddev->new_layout = 0; | |
2750 | mddev->new_chunk_sectors = 0; | |
2751 | conf = setup_conf(mddev); | |
2752 | if (!IS_ERR(conf)) | |
2753 | conf->barrier = 1; | |
2754 | return conf; | |
2755 | } | |
2756 | return ERR_PTR(-EINVAL); | |
2757 | } | |
1da177e4 | 2758 | |
84fc4b56 | 2759 | static struct md_personality raid1_personality = |
1da177e4 LT |
2760 | { |
2761 | .name = "raid1", | |
2604b703 | 2762 | .level = 1, |
1da177e4 LT |
2763 | .owner = THIS_MODULE, |
2764 | .make_request = make_request, | |
2765 | .run = run, | |
2766 | .stop = stop, | |
2767 | .status = status, | |
2768 | .error_handler = error, | |
2769 | .hot_add_disk = raid1_add_disk, | |
2770 | .hot_remove_disk= raid1_remove_disk, | |
2771 | .spare_active = raid1_spare_active, | |
2772 | .sync_request = sync_request, | |
2773 | .resize = raid1_resize, | |
80c3a6ce | 2774 | .size = raid1_size, |
63c70c4f | 2775 | .check_reshape = raid1_reshape, |
36fa3063 | 2776 | .quiesce = raid1_quiesce, |
709ae487 | 2777 | .takeover = raid1_takeover, |
1da177e4 LT |
2778 | }; |
2779 | ||
2780 | static int __init raid_init(void) | |
2781 | { | |
2604b703 | 2782 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2783 | } |
2784 | ||
2785 | static void raid_exit(void) | |
2786 | { | |
2604b703 | 2787 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2788 | } |
2789 | ||
2790 | module_init(raid_init); | |
2791 | module_exit(raid_exit); | |
2792 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2793 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2794 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2795 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2796 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
2797 | |
2798 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |