Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
bff61975 | 37 | #include <linux/seq_file.h> |
8bda470e | 38 | #include <linux/ratelimit.h> |
43b2e5d8 | 39 | #include "md.h" |
ef740c37 CH |
40 | #include "raid1.h" |
41 | #include "bitmap.h" | |
191ea9b2 N |
42 | |
43 | #define DEBUG 0 | |
d2eb35ac | 44 | #define PRINTK(x...) do { if (DEBUG) printk(x); } while (0) |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Number of guaranteed r1bios in case of extreme VM load: | |
48 | */ | |
49 | #define NR_RAID1_BIOS 256 | |
50 | ||
1da177e4 | 51 | |
17999be4 N |
52 | static void allow_barrier(conf_t *conf); |
53 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 54 | |
dd0fc66f | 55 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
56 | { |
57 | struct pool_info *pi = data; | |
1da177e4 LT |
58 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); |
59 | ||
60 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 61 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
62 | } |
63 | ||
64 | static void r1bio_pool_free(void *r1_bio, void *data) | |
65 | { | |
66 | kfree(r1_bio); | |
67 | } | |
68 | ||
69 | #define RESYNC_BLOCK_SIZE (64*1024) | |
70 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
71 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
72 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
73 | #define RESYNC_WINDOW (2048*1024) | |
74 | ||
dd0fc66f | 75 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
76 | { |
77 | struct pool_info *pi = data; | |
78 | struct page *page; | |
79 | r1bio_t *r1_bio; | |
80 | struct bio *bio; | |
81 | int i, j; | |
82 | ||
83 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 84 | if (!r1_bio) |
1da177e4 | 85 | return NULL; |
1da177e4 LT |
86 | |
87 | /* | |
88 | * Allocate bios : 1 for reading, n-1 for writing | |
89 | */ | |
90 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 91 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
92 | if (!bio) |
93 | goto out_free_bio; | |
94 | r1_bio->bios[j] = bio; | |
95 | } | |
96 | /* | |
97 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
98 | * the first bio. |
99 | * If this is a user-requested check/repair, allocate | |
100 | * RESYNC_PAGES for each bio. | |
1da177e4 | 101 | */ |
d11c171e N |
102 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
103 | j = pi->raid_disks; | |
104 | else | |
105 | j = 1; | |
106 | while(j--) { | |
107 | bio = r1_bio->bios[j]; | |
108 | for (i = 0; i < RESYNC_PAGES; i++) { | |
109 | page = alloc_page(gfp_flags); | |
110 | if (unlikely(!page)) | |
111 | goto out_free_pages; | |
112 | ||
113 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 114 | bio->bi_vcnt = i+1; |
d11c171e N |
115 | } |
116 | } | |
117 | /* If not user-requests, copy the page pointers to all bios */ | |
118 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
119 | for (i=0; i<RESYNC_PAGES ; i++) | |
120 | for (j=1; j<pi->raid_disks; j++) | |
121 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
122 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
123 | } |
124 | ||
125 | r1_bio->master_bio = NULL; | |
126 | ||
127 | return r1_bio; | |
128 | ||
129 | out_free_pages: | |
303a0e11 N |
130 | for (j=0 ; j < pi->raid_disks; j++) |
131 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
132 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 133 | j = -1; |
1da177e4 LT |
134 | out_free_bio: |
135 | while ( ++j < pi->raid_disks ) | |
136 | bio_put(r1_bio->bios[j]); | |
137 | r1bio_pool_free(r1_bio, data); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
142 | { | |
143 | struct pool_info *pi = data; | |
d11c171e | 144 | int i,j; |
1da177e4 | 145 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 146 | |
d11c171e N |
147 | for (i = 0; i < RESYNC_PAGES; i++) |
148 | for (j = pi->raid_disks; j-- ;) { | |
149 | if (j == 0 || | |
150 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
151 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 152 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 153 | } |
1da177e4 LT |
154 | for (i=0 ; i < pi->raid_disks; i++) |
155 | bio_put(r1bio->bios[i]); | |
156 | ||
157 | r1bio_pool_free(r1bio, data); | |
158 | } | |
159 | ||
160 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
161 | { | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < conf->raid_disks; i++) { | |
165 | struct bio **bio = r1_bio->bios + i; | |
4367af55 | 166 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
167 | bio_put(*bio); |
168 | *bio = NULL; | |
169 | } | |
170 | } | |
171 | ||
858119e1 | 172 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 173 | { |
070ec55d | 174 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 175 | |
1da177e4 LT |
176 | put_all_bios(conf, r1_bio); |
177 | mempool_free(r1_bio, conf->r1bio_pool); | |
178 | } | |
179 | ||
858119e1 | 180 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 | 181 | { |
070ec55d | 182 | conf_t *conf = r1_bio->mddev->private; |
3e198f78 N |
183 | int i; |
184 | ||
185 | for (i=0; i<conf->raid_disks; i++) { | |
186 | struct bio *bio = r1_bio->bios[i]; | |
187 | if (bio->bi_end_io) | |
188 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
189 | } | |
1da177e4 LT |
190 | |
191 | mempool_free(r1_bio, conf->r1buf_pool); | |
192 | ||
17999be4 | 193 | lower_barrier(conf); |
1da177e4 LT |
194 | } |
195 | ||
196 | static void reschedule_retry(r1bio_t *r1_bio) | |
197 | { | |
198 | unsigned long flags; | |
199 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 200 | conf_t *conf = mddev->private; |
1da177e4 LT |
201 | |
202 | spin_lock_irqsave(&conf->device_lock, flags); | |
203 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 204 | conf->nr_queued ++; |
1da177e4 LT |
205 | spin_unlock_irqrestore(&conf->device_lock, flags); |
206 | ||
17999be4 | 207 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
208 | md_wakeup_thread(mddev->thread); |
209 | } | |
210 | ||
211 | /* | |
212 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
213 | * operation and are ready to return a success/failure code to the buffer | |
214 | * cache layer. | |
215 | */ | |
d2eb35ac N |
216 | static void call_bio_endio(r1bio_t *r1_bio) |
217 | { | |
218 | struct bio *bio = r1_bio->master_bio; | |
219 | int done; | |
220 | conf_t *conf = r1_bio->mddev->private; | |
221 | ||
222 | if (bio->bi_phys_segments) { | |
223 | unsigned long flags; | |
224 | spin_lock_irqsave(&conf->device_lock, flags); | |
225 | bio->bi_phys_segments--; | |
226 | done = (bio->bi_phys_segments == 0); | |
227 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
228 | } else | |
229 | done = 1; | |
230 | ||
231 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
232 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
233 | if (done) { | |
234 | bio_endio(bio, 0); | |
235 | /* | |
236 | * Wake up any possible resync thread that waits for the device | |
237 | * to go idle. | |
238 | */ | |
239 | allow_barrier(conf); | |
240 | } | |
241 | } | |
242 | ||
1da177e4 LT |
243 | static void raid_end_bio_io(r1bio_t *r1_bio) |
244 | { | |
245 | struct bio *bio = r1_bio->master_bio; | |
246 | ||
4b6d287f N |
247 | /* if nobody has done the final endio yet, do it now */ |
248 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
249 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
250 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
251 | (unsigned long long) bio->bi_sector, | |
252 | (unsigned long long) bio->bi_sector + | |
253 | (bio->bi_size >> 9) - 1); | |
254 | ||
d2eb35ac | 255 | call_bio_endio(r1_bio); |
4b6d287f | 256 | } |
1da177e4 LT |
257 | free_r1bio(r1_bio); |
258 | } | |
259 | ||
260 | /* | |
261 | * Update disk head position estimator based on IRQ completion info. | |
262 | */ | |
263 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
264 | { | |
070ec55d | 265 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
266 | |
267 | conf->mirrors[disk].head_position = | |
268 | r1_bio->sector + (r1_bio->sectors); | |
269 | } | |
270 | ||
ba3ae3be NK |
271 | /* |
272 | * Find the disk number which triggered given bio | |
273 | */ | |
274 | static int find_bio_disk(r1bio_t *r1_bio, struct bio *bio) | |
275 | { | |
276 | int mirror; | |
277 | int raid_disks = r1_bio->mddev->raid_disks; | |
278 | ||
279 | for (mirror = 0; mirror < raid_disks; mirror++) | |
280 | if (r1_bio->bios[mirror] == bio) | |
281 | break; | |
282 | ||
283 | BUG_ON(mirror == raid_disks); | |
284 | update_head_pos(mirror, r1_bio); | |
285 | ||
286 | return mirror; | |
287 | } | |
288 | ||
6712ecf8 | 289 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
290 | { |
291 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 292 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 293 | int mirror; |
070ec55d | 294 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 295 | |
1da177e4 LT |
296 | mirror = r1_bio->read_disk; |
297 | /* | |
298 | * this branch is our 'one mirror IO has finished' event handler: | |
299 | */ | |
ddaf22ab N |
300 | update_head_pos(mirror, r1_bio); |
301 | ||
dd00a99e N |
302 | if (uptodate) |
303 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
304 | else { | |
305 | /* If all other devices have failed, we want to return | |
306 | * the error upwards rather than fail the last device. | |
307 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 308 | */ |
dd00a99e N |
309 | unsigned long flags; |
310 | spin_lock_irqsave(&conf->device_lock, flags); | |
311 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
312 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
313 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
314 | uptodate = 1; | |
315 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
316 | } | |
1da177e4 | 317 | |
dd00a99e | 318 | if (uptodate) |
1da177e4 | 319 | raid_end_bio_io(r1_bio); |
dd00a99e | 320 | else { |
1da177e4 LT |
321 | /* |
322 | * oops, read error: | |
323 | */ | |
324 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
325 | printk_ratelimited( |
326 | KERN_ERR "md/raid1:%s: %s: " | |
327 | "rescheduling sector %llu\n", | |
328 | mdname(conf->mddev), | |
329 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
330 | b), | |
331 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 332 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 LT |
333 | reschedule_retry(r1_bio); |
334 | } | |
335 | ||
336 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
337 | } |
338 | ||
cd5ff9a1 N |
339 | static void close_write(r1bio_t *r1_bio) |
340 | { | |
341 | /* it really is the end of this request */ | |
342 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
343 | /* free extra copy of the data pages */ | |
344 | int i = r1_bio->behind_page_count; | |
345 | while (i--) | |
346 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
347 | kfree(r1_bio->behind_bvecs); | |
348 | r1_bio->behind_bvecs = NULL; | |
349 | } | |
350 | /* clear the bitmap if all writes complete successfully */ | |
351 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
352 | r1_bio->sectors, | |
353 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
354 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
355 | md_write_end(r1_bio->mddev); | |
356 | } | |
357 | ||
af6d7b76 | 358 | static void r1_bio_write_done(r1bio_t *r1_bio) |
4e78064f | 359 | { |
cd5ff9a1 N |
360 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
361 | return; | |
362 | ||
363 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
364 | reschedule_retry(r1_bio); | |
365 | else { | |
366 | close_write(r1_bio); | |
4367af55 N |
367 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
368 | reschedule_retry(r1_bio); | |
369 | else | |
370 | raid_end_bio_io(r1_bio); | |
4e78064f N |
371 | } |
372 | } | |
373 | ||
6712ecf8 | 374 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
375 | { |
376 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 377 | r1bio_t *r1_bio = bio->bi_private; |
a9701a30 | 378 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
070ec55d | 379 | conf_t *conf = r1_bio->mddev->private; |
04b857f7 | 380 | struct bio *to_put = NULL; |
1da177e4 | 381 | |
ba3ae3be | 382 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 383 | |
e9c7469b TH |
384 | /* |
385 | * 'one mirror IO has finished' event handler: | |
386 | */ | |
e9c7469b | 387 | if (!uptodate) { |
cd5ff9a1 N |
388 | set_bit(WriteErrorSeen, |
389 | &conf->mirrors[mirror].rdev->flags); | |
390 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 391 | } else { |
1da177e4 | 392 | /* |
e9c7469b TH |
393 | * Set R1BIO_Uptodate in our master bio, so that we |
394 | * will return a good error code for to the higher | |
395 | * levels even if IO on some other mirrored buffer | |
396 | * fails. | |
397 | * | |
398 | * The 'master' represents the composite IO operation | |
399 | * to user-side. So if something waits for IO, then it | |
400 | * will wait for the 'master' bio. | |
1da177e4 | 401 | */ |
4367af55 N |
402 | sector_t first_bad; |
403 | int bad_sectors; | |
404 | ||
cd5ff9a1 N |
405 | r1_bio->bios[mirror] = NULL; |
406 | to_put = bio; | |
e9c7469b TH |
407 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
408 | ||
4367af55 N |
409 | /* Maybe we can clear some bad blocks. */ |
410 | if (is_badblock(conf->mirrors[mirror].rdev, | |
411 | r1_bio->sector, r1_bio->sectors, | |
412 | &first_bad, &bad_sectors)) { | |
413 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
414 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
415 | } | |
416 | } | |
417 | ||
e9c7469b TH |
418 | if (behind) { |
419 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
420 | atomic_dec(&r1_bio->behind_remaining); | |
421 | ||
422 | /* | |
423 | * In behind mode, we ACK the master bio once the I/O | |
424 | * has safely reached all non-writemostly | |
425 | * disks. Setting the Returned bit ensures that this | |
426 | * gets done only once -- we don't ever want to return | |
427 | * -EIO here, instead we'll wait | |
428 | */ | |
429 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
430 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
431 | /* Maybe we can return now */ | |
432 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
433 | struct bio *mbio = r1_bio->master_bio; | |
434 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
435 | (unsigned long long) mbio->bi_sector, | |
436 | (unsigned long long) mbio->bi_sector + | |
437 | (mbio->bi_size >> 9) - 1); | |
d2eb35ac | 438 | call_bio_endio(r1_bio); |
4b6d287f N |
439 | } |
440 | } | |
441 | } | |
4367af55 N |
442 | if (r1_bio->bios[mirror] == NULL) |
443 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
444 | conf->mddev); | |
e9c7469b | 445 | |
1da177e4 | 446 | /* |
1da177e4 LT |
447 | * Let's see if all mirrored write operations have finished |
448 | * already. | |
449 | */ | |
af6d7b76 | 450 | r1_bio_write_done(r1_bio); |
c70810b3 | 451 | |
04b857f7 N |
452 | if (to_put) |
453 | bio_put(to_put); | |
1da177e4 LT |
454 | } |
455 | ||
456 | ||
457 | /* | |
458 | * This routine returns the disk from which the requested read should | |
459 | * be done. There is a per-array 'next expected sequential IO' sector | |
460 | * number - if this matches on the next IO then we use the last disk. | |
461 | * There is also a per-disk 'last know head position' sector that is | |
462 | * maintained from IRQ contexts, both the normal and the resync IO | |
463 | * completion handlers update this position correctly. If there is no | |
464 | * perfect sequential match then we pick the disk whose head is closest. | |
465 | * | |
466 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
467 | * because position is mirror, not device based. | |
468 | * | |
469 | * The rdev for the device selected will have nr_pending incremented. | |
470 | */ | |
d2eb35ac | 471 | static int read_balance(conf_t *conf, r1bio_t *r1_bio, int *max_sectors) |
1da177e4 | 472 | { |
af3a2cd6 | 473 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
474 | int sectors; |
475 | int best_good_sectors; | |
f3ac8bf7 | 476 | int start_disk; |
76073054 | 477 | int best_disk; |
f3ac8bf7 | 478 | int i; |
76073054 | 479 | sector_t best_dist; |
8ddf9efe | 480 | mdk_rdev_t *rdev; |
f3ac8bf7 | 481 | int choose_first; |
1da177e4 LT |
482 | |
483 | rcu_read_lock(); | |
484 | /* | |
8ddf9efe | 485 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
486 | * device if no resync is going on, or below the resync window. |
487 | * We take the first readable disk when above the resync window. | |
488 | */ | |
489 | retry: | |
d2eb35ac | 490 | sectors = r1_bio->sectors; |
76073054 N |
491 | best_disk = -1; |
492 | best_dist = MaxSector; | |
d2eb35ac N |
493 | best_good_sectors = 0; |
494 | ||
1da177e4 LT |
495 | if (conf->mddev->recovery_cp < MaxSector && |
496 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
497 | choose_first = 1; |
498 | start_disk = 0; | |
499 | } else { | |
500 | choose_first = 0; | |
501 | start_disk = conf->last_used; | |
1da177e4 LT |
502 | } |
503 | ||
f3ac8bf7 | 504 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 505 | sector_t dist; |
d2eb35ac N |
506 | sector_t first_bad; |
507 | int bad_sectors; | |
508 | ||
f3ac8bf7 N |
509 | int disk = start_disk + i; |
510 | if (disk >= conf->raid_disks) | |
511 | disk -= conf->raid_disks; | |
512 | ||
513 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
514 | if (r1_bio->bios[disk] == IO_BLOCKED | |
515 | || rdev == NULL | |
76073054 | 516 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 517 | continue; |
76073054 N |
518 | if (!test_bit(In_sync, &rdev->flags) && |
519 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 520 | continue; |
76073054 N |
521 | if (test_bit(WriteMostly, &rdev->flags)) { |
522 | /* Don't balance among write-mostly, just | |
523 | * use the first as a last resort */ | |
524 | if (best_disk < 0) | |
525 | best_disk = disk; | |
526 | continue; | |
527 | } | |
528 | /* This is a reasonable device to use. It might | |
529 | * even be best. | |
530 | */ | |
d2eb35ac N |
531 | if (is_badblock(rdev, this_sector, sectors, |
532 | &first_bad, &bad_sectors)) { | |
533 | if (best_dist < MaxSector) | |
534 | /* already have a better device */ | |
535 | continue; | |
536 | if (first_bad <= this_sector) { | |
537 | /* cannot read here. If this is the 'primary' | |
538 | * device, then we must not read beyond | |
539 | * bad_sectors from another device.. | |
540 | */ | |
541 | bad_sectors -= (this_sector - first_bad); | |
542 | if (choose_first && sectors > bad_sectors) | |
543 | sectors = bad_sectors; | |
544 | if (best_good_sectors > sectors) | |
545 | best_good_sectors = sectors; | |
546 | ||
547 | } else { | |
548 | sector_t good_sectors = first_bad - this_sector; | |
549 | if (good_sectors > best_good_sectors) { | |
550 | best_good_sectors = good_sectors; | |
551 | best_disk = disk; | |
552 | } | |
553 | if (choose_first) | |
554 | break; | |
555 | } | |
556 | continue; | |
557 | } else | |
558 | best_good_sectors = sectors; | |
559 | ||
76073054 N |
560 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
561 | if (choose_first | |
562 | /* Don't change to another disk for sequential reads */ | |
563 | || conf->next_seq_sect == this_sector | |
564 | || dist == 0 | |
565 | /* If device is idle, use it */ | |
566 | || atomic_read(&rdev->nr_pending) == 0) { | |
567 | best_disk = disk; | |
1da177e4 LT |
568 | break; |
569 | } | |
76073054 N |
570 | if (dist < best_dist) { |
571 | best_dist = dist; | |
572 | best_disk = disk; | |
1da177e4 | 573 | } |
f3ac8bf7 | 574 | } |
1da177e4 | 575 | |
76073054 N |
576 | if (best_disk >= 0) { |
577 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
578 | if (!rdev) |
579 | goto retry; | |
580 | atomic_inc(&rdev->nr_pending); | |
76073054 | 581 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
582 | /* cannot risk returning a device that failed |
583 | * before we inc'ed nr_pending | |
584 | */ | |
03c902e1 | 585 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
586 | goto retry; |
587 | } | |
d2eb35ac | 588 | sectors = best_good_sectors; |
8ddf9efe | 589 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 590 | conf->last_used = best_disk; |
1da177e4 LT |
591 | } |
592 | rcu_read_unlock(); | |
d2eb35ac | 593 | *max_sectors = sectors; |
1da177e4 | 594 | |
76073054 | 595 | return best_disk; |
1da177e4 LT |
596 | } |
597 | ||
1ed7242e | 598 | int md_raid1_congested(mddev_t *mddev, int bits) |
0d129228 | 599 | { |
070ec55d | 600 | conf_t *conf = mddev->private; |
0d129228 N |
601 | int i, ret = 0; |
602 | ||
603 | rcu_read_lock(); | |
604 | for (i = 0; i < mddev->raid_disks; i++) { | |
605 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
606 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
165125e1 | 607 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 608 | |
1ed7242e JB |
609 | BUG_ON(!q); |
610 | ||
0d129228 N |
611 | /* Note the '|| 1' - when read_balance prefers |
612 | * non-congested targets, it can be removed | |
613 | */ | |
91a9e99d | 614 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
615 | ret |= bdi_congested(&q->backing_dev_info, bits); |
616 | else | |
617 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
618 | } | |
619 | } | |
620 | rcu_read_unlock(); | |
621 | return ret; | |
622 | } | |
1ed7242e | 623 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 624 | |
1ed7242e JB |
625 | static int raid1_congested(void *data, int bits) |
626 | { | |
627 | mddev_t *mddev = data; | |
628 | ||
629 | return mddev_congested(mddev, bits) || | |
630 | md_raid1_congested(mddev, bits); | |
631 | } | |
0d129228 | 632 | |
7eaceacc | 633 | static void flush_pending_writes(conf_t *conf) |
a35e63ef N |
634 | { |
635 | /* Any writes that have been queued but are awaiting | |
636 | * bitmap updates get flushed here. | |
a35e63ef | 637 | */ |
a35e63ef N |
638 | spin_lock_irq(&conf->device_lock); |
639 | ||
640 | if (conf->pending_bio_list.head) { | |
641 | struct bio *bio; | |
642 | bio = bio_list_get(&conf->pending_bio_list); | |
a35e63ef N |
643 | spin_unlock_irq(&conf->device_lock); |
644 | /* flush any pending bitmap writes to | |
645 | * disk before proceeding w/ I/O */ | |
646 | bitmap_unplug(conf->mddev->bitmap); | |
647 | ||
648 | while (bio) { /* submit pending writes */ | |
649 | struct bio *next = bio->bi_next; | |
650 | bio->bi_next = NULL; | |
651 | generic_make_request(bio); | |
652 | bio = next; | |
653 | } | |
a35e63ef N |
654 | } else |
655 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
656 | } |
657 | ||
17999be4 N |
658 | /* Barriers.... |
659 | * Sometimes we need to suspend IO while we do something else, | |
660 | * either some resync/recovery, or reconfigure the array. | |
661 | * To do this we raise a 'barrier'. | |
662 | * The 'barrier' is a counter that can be raised multiple times | |
663 | * to count how many activities are happening which preclude | |
664 | * normal IO. | |
665 | * We can only raise the barrier if there is no pending IO. | |
666 | * i.e. if nr_pending == 0. | |
667 | * We choose only to raise the barrier if no-one is waiting for the | |
668 | * barrier to go down. This means that as soon as an IO request | |
669 | * is ready, no other operations which require a barrier will start | |
670 | * until the IO request has had a chance. | |
671 | * | |
672 | * So: regular IO calls 'wait_barrier'. When that returns there | |
673 | * is no backgroup IO happening, It must arrange to call | |
674 | * allow_barrier when it has finished its IO. | |
675 | * backgroup IO calls must call raise_barrier. Once that returns | |
676 | * there is no normal IO happeing. It must arrange to call | |
677 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
678 | */ |
679 | #define RESYNC_DEPTH 32 | |
680 | ||
17999be4 | 681 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
682 | { |
683 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
684 | |
685 | /* Wait until no block IO is waiting */ | |
686 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 687 | conf->resync_lock, ); |
17999be4 N |
688 | |
689 | /* block any new IO from starting */ | |
690 | conf->barrier++; | |
691 | ||
046abeed | 692 | /* Now wait for all pending IO to complete */ |
17999be4 N |
693 | wait_event_lock_irq(conf->wait_barrier, |
694 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 695 | conf->resync_lock, ); |
17999be4 N |
696 | |
697 | spin_unlock_irq(&conf->resync_lock); | |
698 | } | |
699 | ||
700 | static void lower_barrier(conf_t *conf) | |
701 | { | |
702 | unsigned long flags; | |
709ae487 | 703 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
704 | spin_lock_irqsave(&conf->resync_lock, flags); |
705 | conf->barrier--; | |
706 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
707 | wake_up(&conf->wait_barrier); | |
708 | } | |
709 | ||
710 | static void wait_barrier(conf_t *conf) | |
711 | { | |
712 | spin_lock_irq(&conf->resync_lock); | |
713 | if (conf->barrier) { | |
714 | conf->nr_waiting++; | |
715 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
716 | conf->resync_lock, | |
c3b328ac | 717 | ); |
17999be4 | 718 | conf->nr_waiting--; |
1da177e4 | 719 | } |
17999be4 | 720 | conf->nr_pending++; |
1da177e4 LT |
721 | spin_unlock_irq(&conf->resync_lock); |
722 | } | |
723 | ||
17999be4 N |
724 | static void allow_barrier(conf_t *conf) |
725 | { | |
726 | unsigned long flags; | |
727 | spin_lock_irqsave(&conf->resync_lock, flags); | |
728 | conf->nr_pending--; | |
729 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
730 | wake_up(&conf->wait_barrier); | |
731 | } | |
732 | ||
ddaf22ab N |
733 | static void freeze_array(conf_t *conf) |
734 | { | |
735 | /* stop syncio and normal IO and wait for everything to | |
736 | * go quite. | |
737 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
738 | * wait until nr_pending match nr_queued+1 |
739 | * This is called in the context of one normal IO request | |
740 | * that has failed. Thus any sync request that might be pending | |
741 | * will be blocked by nr_pending, and we need to wait for | |
742 | * pending IO requests to complete or be queued for re-try. | |
743 | * Thus the number queued (nr_queued) plus this request (1) | |
744 | * must match the number of pending IOs (nr_pending) before | |
745 | * we continue. | |
ddaf22ab N |
746 | */ |
747 | spin_lock_irq(&conf->resync_lock); | |
748 | conf->barrier++; | |
749 | conf->nr_waiting++; | |
750 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 751 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 752 | conf->resync_lock, |
c3b328ac | 753 | flush_pending_writes(conf)); |
ddaf22ab N |
754 | spin_unlock_irq(&conf->resync_lock); |
755 | } | |
756 | static void unfreeze_array(conf_t *conf) | |
757 | { | |
758 | /* reverse the effect of the freeze */ | |
759 | spin_lock_irq(&conf->resync_lock); | |
760 | conf->barrier--; | |
761 | conf->nr_waiting--; | |
762 | wake_up(&conf->wait_barrier); | |
763 | spin_unlock_irq(&conf->resync_lock); | |
764 | } | |
765 | ||
17999be4 | 766 | |
4e78064f | 767 | /* duplicate the data pages for behind I/O |
4e78064f | 768 | */ |
af6d7b76 | 769 | static void alloc_behind_pages(struct bio *bio, r1bio_t *r1_bio) |
4b6d287f N |
770 | { |
771 | int i; | |
772 | struct bio_vec *bvec; | |
2ca68f5e | 773 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 774 | GFP_NOIO); |
2ca68f5e | 775 | if (unlikely(!bvecs)) |
af6d7b76 | 776 | return; |
4b6d287f | 777 | |
4b6d287f | 778 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
779 | bvecs[i] = *bvec; |
780 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
781 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 782 | goto do_sync_io; |
2ca68f5e N |
783 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
784 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
785 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
786 | kunmap(bvec->bv_page); |
787 | } | |
2ca68f5e | 788 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
789 | r1_bio->behind_page_count = bio->bi_vcnt; |
790 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
791 | return; | |
4b6d287f N |
792 | |
793 | do_sync_io: | |
af6d7b76 | 794 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
795 | if (bvecs[i].bv_page) |
796 | put_page(bvecs[i].bv_page); | |
797 | kfree(bvecs); | |
4b6d287f | 798 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
799 | } |
800 | ||
21a52c6d | 801 | static int make_request(mddev_t *mddev, struct bio * bio) |
1da177e4 | 802 | { |
070ec55d | 803 | conf_t *conf = mddev->private; |
1da177e4 LT |
804 | mirror_info_t *mirror; |
805 | r1bio_t *r1_bio; | |
806 | struct bio *read_bio; | |
1f68f0c4 | 807 | int i, disks; |
84255d10 | 808 | struct bitmap *bitmap; |
191ea9b2 | 809 | unsigned long flags; |
a362357b | 810 | const int rw = bio_data_dir(bio); |
2c7d46ec | 811 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 812 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
6bfe0b49 | 813 | mdk_rdev_t *blocked_rdev; |
c3b328ac | 814 | int plugged; |
1f68f0c4 N |
815 | int first_clone; |
816 | int sectors_handled; | |
817 | int max_sectors; | |
191ea9b2 | 818 | |
1da177e4 LT |
819 | /* |
820 | * Register the new request and wait if the reconstruction | |
821 | * thread has put up a bar for new requests. | |
822 | * Continue immediately if no resync is active currently. | |
823 | */ | |
62de608d | 824 | |
3d310eb7 N |
825 | md_write_start(mddev, bio); /* wait on superblock update early */ |
826 | ||
6eef4b21 N |
827 | if (bio_data_dir(bio) == WRITE && |
828 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
829 | bio->bi_sector < mddev->suspend_hi) { | |
830 | /* As the suspend_* range is controlled by | |
831 | * userspace, we want an interruptible | |
832 | * wait. | |
833 | */ | |
834 | DEFINE_WAIT(w); | |
835 | for (;;) { | |
836 | flush_signals(current); | |
837 | prepare_to_wait(&conf->wait_barrier, | |
838 | &w, TASK_INTERRUPTIBLE); | |
839 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
840 | bio->bi_sector >= mddev->suspend_hi) | |
841 | break; | |
842 | schedule(); | |
843 | } | |
844 | finish_wait(&conf->wait_barrier, &w); | |
845 | } | |
62de608d | 846 | |
17999be4 | 847 | wait_barrier(conf); |
1da177e4 | 848 | |
84255d10 N |
849 | bitmap = mddev->bitmap; |
850 | ||
1da177e4 LT |
851 | /* |
852 | * make_request() can abort the operation when READA is being | |
853 | * used and no empty request is available. | |
854 | * | |
855 | */ | |
856 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
857 | ||
858 | r1_bio->master_bio = bio; | |
859 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 860 | r1_bio->state = 0; |
1da177e4 LT |
861 | r1_bio->mddev = mddev; |
862 | r1_bio->sector = bio->bi_sector; | |
863 | ||
d2eb35ac N |
864 | /* We might need to issue multiple reads to different |
865 | * devices if there are bad blocks around, so we keep | |
866 | * track of the number of reads in bio->bi_phys_segments. | |
867 | * If this is 0, there is only one r1_bio and no locking | |
868 | * will be needed when requests complete. If it is | |
869 | * non-zero, then it is the number of not-completed requests. | |
870 | */ | |
871 | bio->bi_phys_segments = 0; | |
872 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
873 | ||
a362357b | 874 | if (rw == READ) { |
1da177e4 LT |
875 | /* |
876 | * read balancing logic: | |
877 | */ | |
d2eb35ac N |
878 | int rdisk; |
879 | ||
880 | read_again: | |
881 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
882 | |
883 | if (rdisk < 0) { | |
884 | /* couldn't find anywhere to read from */ | |
885 | raid_end_bio_io(r1_bio); | |
886 | return 0; | |
887 | } | |
888 | mirror = conf->mirrors + rdisk; | |
889 | ||
e555190d N |
890 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
891 | bitmap) { | |
892 | /* Reading from a write-mostly device must | |
893 | * take care not to over-take any writes | |
894 | * that are 'behind' | |
895 | */ | |
896 | wait_event(bitmap->behind_wait, | |
897 | atomic_read(&bitmap->behind_writes) == 0); | |
898 | } | |
1da177e4 LT |
899 | r1_bio->read_disk = rdisk; |
900 | ||
a167f663 | 901 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
902 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
903 | max_sectors); | |
1da177e4 LT |
904 | |
905 | r1_bio->bios[rdisk] = read_bio; | |
906 | ||
907 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
908 | read_bio->bi_bdev = mirror->rdev->bdev; | |
909 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 910 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
911 | read_bio->bi_private = r1_bio; |
912 | ||
d2eb35ac N |
913 | if (max_sectors < r1_bio->sectors) { |
914 | /* could not read all from this device, so we will | |
915 | * need another r1_bio. | |
916 | */ | |
d2eb35ac N |
917 | |
918 | sectors_handled = (r1_bio->sector + max_sectors | |
919 | - bio->bi_sector); | |
920 | r1_bio->sectors = max_sectors; | |
921 | spin_lock_irq(&conf->device_lock); | |
922 | if (bio->bi_phys_segments == 0) | |
923 | bio->bi_phys_segments = 2; | |
924 | else | |
925 | bio->bi_phys_segments++; | |
926 | spin_unlock_irq(&conf->device_lock); | |
927 | /* Cannot call generic_make_request directly | |
928 | * as that will be queued in __make_request | |
929 | * and subsequent mempool_alloc might block waiting | |
930 | * for it. So hand bio over to raid1d. | |
931 | */ | |
932 | reschedule_retry(r1_bio); | |
933 | ||
934 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
935 | ||
936 | r1_bio->master_bio = bio; | |
937 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
938 | r1_bio->state = 0; | |
939 | r1_bio->mddev = mddev; | |
940 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
941 | goto read_again; | |
942 | } else | |
943 | generic_make_request(read_bio); | |
1da177e4 LT |
944 | return 0; |
945 | } | |
946 | ||
947 | /* | |
948 | * WRITE: | |
949 | */ | |
1f68f0c4 | 950 | /* first select target devices under rcu_lock and |
1da177e4 LT |
951 | * inc refcount on their rdev. Record them by setting |
952 | * bios[x] to bio | |
1f68f0c4 N |
953 | * If there are known/acknowledged bad blocks on any device on |
954 | * which we have seen a write error, we want to avoid writing those | |
955 | * blocks. | |
956 | * This potentially requires several writes to write around | |
957 | * the bad blocks. Each set of writes gets it's own r1bio | |
958 | * with a set of bios attached. | |
1da177e4 | 959 | */ |
c3b328ac N |
960 | plugged = mddev_check_plugged(mddev); |
961 | ||
1da177e4 | 962 | disks = conf->raid_disks; |
6bfe0b49 DW |
963 | retry_write: |
964 | blocked_rdev = NULL; | |
1da177e4 | 965 | rcu_read_lock(); |
1f68f0c4 | 966 | max_sectors = r1_bio->sectors; |
1da177e4 | 967 | for (i = 0; i < disks; i++) { |
6bfe0b49 DW |
968 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
969 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
970 | atomic_inc(&rdev->nr_pending); | |
971 | blocked_rdev = rdev; | |
972 | break; | |
973 | } | |
1f68f0c4 N |
974 | r1_bio->bios[i] = NULL; |
975 | if (!rdev || test_bit(Faulty, &rdev->flags)) { | |
976 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
977 | continue; | |
978 | } | |
979 | ||
980 | atomic_inc(&rdev->nr_pending); | |
981 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
982 | sector_t first_bad; | |
983 | int bad_sectors; | |
984 | int is_bad; | |
985 | ||
986 | is_bad = is_badblock(rdev, r1_bio->sector, | |
987 | max_sectors, | |
988 | &first_bad, &bad_sectors); | |
989 | if (is_bad < 0) { | |
990 | /* mustn't write here until the bad block is | |
991 | * acknowledged*/ | |
992 | set_bit(BlockedBadBlocks, &rdev->flags); | |
993 | blocked_rdev = rdev; | |
994 | break; | |
995 | } | |
996 | if (is_bad && first_bad <= r1_bio->sector) { | |
997 | /* Cannot write here at all */ | |
998 | bad_sectors -= (r1_bio->sector - first_bad); | |
999 | if (bad_sectors < max_sectors) | |
1000 | /* mustn't write more than bad_sectors | |
1001 | * to other devices yet | |
1002 | */ | |
1003 | max_sectors = bad_sectors; | |
03c902e1 | 1004 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1005 | /* We don't set R1BIO_Degraded as that |
1006 | * only applies if the disk is | |
1007 | * missing, so it might be re-added, | |
1008 | * and we want to know to recover this | |
1009 | * chunk. | |
1010 | * In this case the device is here, | |
1011 | * and the fact that this chunk is not | |
1012 | * in-sync is recorded in the bad | |
1013 | * block log | |
1014 | */ | |
1015 | continue; | |
964147d5 | 1016 | } |
1f68f0c4 N |
1017 | if (is_bad) { |
1018 | int good_sectors = first_bad - r1_bio->sector; | |
1019 | if (good_sectors < max_sectors) | |
1020 | max_sectors = good_sectors; | |
1021 | } | |
1022 | } | |
1023 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1024 | } |
1025 | rcu_read_unlock(); | |
1026 | ||
6bfe0b49 DW |
1027 | if (unlikely(blocked_rdev)) { |
1028 | /* Wait for this device to become unblocked */ | |
1029 | int j; | |
1030 | ||
1031 | for (j = 0; j < i; j++) | |
1032 | if (r1_bio->bios[j]) | |
1033 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1034 | r1_bio->state = 0; |
6bfe0b49 DW |
1035 | allow_barrier(conf); |
1036 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1037 | wait_barrier(conf); | |
1038 | goto retry_write; | |
1039 | } | |
1040 | ||
1f68f0c4 N |
1041 | if (max_sectors < r1_bio->sectors) { |
1042 | /* We are splitting this write into multiple parts, so | |
1043 | * we need to prepare for allocating another r1_bio. | |
1044 | */ | |
1045 | r1_bio->sectors = max_sectors; | |
1046 | spin_lock_irq(&conf->device_lock); | |
1047 | if (bio->bi_phys_segments == 0) | |
1048 | bio->bi_phys_segments = 2; | |
1049 | else | |
1050 | bio->bi_phys_segments++; | |
1051 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1052 | } |
1f68f0c4 | 1053 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1054 | |
4e78064f | 1055 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1056 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1057 | |
1f68f0c4 | 1058 | first_clone = 1; |
1da177e4 LT |
1059 | for (i = 0; i < disks; i++) { |
1060 | struct bio *mbio; | |
1061 | if (!r1_bio->bios[i]) | |
1062 | continue; | |
1063 | ||
a167f663 | 1064 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1065 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1066 | ||
1067 | if (first_clone) { | |
1068 | /* do behind I/O ? | |
1069 | * Not if there are too many, or cannot | |
1070 | * allocate memory, or a reader on WriteMostly | |
1071 | * is waiting for behind writes to flush */ | |
1072 | if (bitmap && | |
1073 | (atomic_read(&bitmap->behind_writes) | |
1074 | < mddev->bitmap_info.max_write_behind) && | |
1075 | !waitqueue_active(&bitmap->behind_wait)) | |
1076 | alloc_behind_pages(mbio, r1_bio); | |
1077 | ||
1078 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1079 | r1_bio->sectors, | |
1080 | test_bit(R1BIO_BehindIO, | |
1081 | &r1_bio->state)); | |
1082 | first_clone = 0; | |
1083 | } | |
2ca68f5e | 1084 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1085 | struct bio_vec *bvec; |
1086 | int j; | |
1087 | ||
1088 | /* Yes, I really want the '__' version so that | |
1089 | * we clear any unused pointer in the io_vec, rather | |
1090 | * than leave them unchanged. This is important | |
1091 | * because when we come to free the pages, we won't | |
046abeed | 1092 | * know the original bi_idx, so we just free |
4b6d287f N |
1093 | * them all |
1094 | */ | |
1095 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1096 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1097 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1098 | atomic_inc(&r1_bio->behind_remaining); | |
1099 | } | |
1100 | ||
1f68f0c4 N |
1101 | r1_bio->bios[i] = mbio; |
1102 | ||
1103 | mbio->bi_sector = (r1_bio->sector + | |
1104 | conf->mirrors[i].rdev->data_offset); | |
1105 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1106 | mbio->bi_end_io = raid1_end_write_request; | |
1107 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; | |
1108 | mbio->bi_private = r1_bio; | |
1109 | ||
1da177e4 | 1110 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
1111 | spin_lock_irqsave(&conf->device_lock, flags); |
1112 | bio_list_add(&conf->pending_bio_list, mbio); | |
4e78064f | 1113 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1114 | } |
079fa166 N |
1115 | /* Mustn't call r1_bio_write_done before this next test, |
1116 | * as it could result in the bio being freed. | |
1117 | */ | |
1f68f0c4 | 1118 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1119 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1120 | /* We need another r1_bio. It has already been counted |
1121 | * in bio->bi_phys_segments | |
1122 | */ | |
1123 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1124 | r1_bio->master_bio = bio; | |
1125 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1126 | r1_bio->state = 0; | |
1127 | r1_bio->mddev = mddev; | |
1128 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1129 | goto retry_write; | |
1130 | } | |
1131 | ||
079fa166 N |
1132 | r1_bio_write_done(r1_bio); |
1133 | ||
1134 | /* In case raid1d snuck in to freeze_array */ | |
1135 | wake_up(&conf->wait_barrier); | |
1136 | ||
c3b328ac | 1137 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 1138 | md_wakeup_thread(mddev->thread); |
191ea9b2 | 1139 | |
1da177e4 LT |
1140 | return 0; |
1141 | } | |
1142 | ||
1143 | static void status(struct seq_file *seq, mddev_t *mddev) | |
1144 | { | |
070ec55d | 1145 | conf_t *conf = mddev->private; |
1da177e4 LT |
1146 | int i; |
1147 | ||
1148 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1149 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1150 | rcu_read_lock(); |
1151 | for (i = 0; i < conf->raid_disks; i++) { | |
1152 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 1153 | seq_printf(seq, "%s", |
ddac7c7e N |
1154 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1155 | } | |
1156 | rcu_read_unlock(); | |
1da177e4 LT |
1157 | seq_printf(seq, "]"); |
1158 | } | |
1159 | ||
1160 | ||
1161 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1162 | { | |
1163 | char b[BDEVNAME_SIZE]; | |
070ec55d | 1164 | conf_t *conf = mddev->private; |
1da177e4 LT |
1165 | |
1166 | /* | |
1167 | * If it is not operational, then we have already marked it as dead | |
1168 | * else if it is the last working disks, ignore the error, let the | |
1169 | * next level up know. | |
1170 | * else mark the drive as failed | |
1171 | */ | |
b2d444d7 | 1172 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1173 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1174 | /* |
1175 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1176 | * normal single drive. |
1177 | * However don't try a recovery from this drive as | |
1178 | * it is very likely to fail. | |
1da177e4 | 1179 | */ |
5389042f | 1180 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1181 | return; |
4044ba58 | 1182 | } |
de393cde | 1183 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1184 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1185 | unsigned long flags; | |
1186 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1187 | mddev->degraded++; |
dd00a99e | 1188 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1189 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1190 | /* |
1191 | * if recovery is running, make sure it aborts. | |
1192 | */ | |
dfc70645 | 1193 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1194 | } else |
1195 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1196 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1197 | printk(KERN_ALERT |
1198 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1199 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1200 | mdname(mddev), bdevname(rdev->bdev, b), |
1201 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | static void print_conf(conf_t *conf) | |
1205 | { | |
1206 | int i; | |
1da177e4 | 1207 | |
9dd1e2fa | 1208 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1209 | if (!conf) { |
9dd1e2fa | 1210 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1211 | return; |
1212 | } | |
9dd1e2fa | 1213 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1214 | conf->raid_disks); |
1215 | ||
ddac7c7e | 1216 | rcu_read_lock(); |
1da177e4 LT |
1217 | for (i = 0; i < conf->raid_disks; i++) { |
1218 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
1219 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1220 | if (rdev) | |
9dd1e2fa | 1221 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1222 | i, !test_bit(In_sync, &rdev->flags), |
1223 | !test_bit(Faulty, &rdev->flags), | |
1224 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1225 | } |
ddac7c7e | 1226 | rcu_read_unlock(); |
1da177e4 LT |
1227 | } |
1228 | ||
1229 | static void close_sync(conf_t *conf) | |
1230 | { | |
17999be4 N |
1231 | wait_barrier(conf); |
1232 | allow_barrier(conf); | |
1da177e4 LT |
1233 | |
1234 | mempool_destroy(conf->r1buf_pool); | |
1235 | conf->r1buf_pool = NULL; | |
1236 | } | |
1237 | ||
1238 | static int raid1_spare_active(mddev_t *mddev) | |
1239 | { | |
1240 | int i; | |
1241 | conf_t *conf = mddev->private; | |
6b965620 N |
1242 | int count = 0; |
1243 | unsigned long flags; | |
1da177e4 LT |
1244 | |
1245 | /* | |
1246 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1247 | * and mark them readable. |
1248 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1249 | */ |
1250 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1251 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1252 | if (rdev | |
1253 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1254 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1255 | count++; |
654e8b5a | 1256 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1257 | } |
1258 | } | |
6b965620 N |
1259 | spin_lock_irqsave(&conf->device_lock, flags); |
1260 | mddev->degraded -= count; | |
1261 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1262 | |
1263 | print_conf(conf); | |
6b965620 | 1264 | return count; |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | ||
1268 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1269 | { | |
1270 | conf_t *conf = mddev->private; | |
199050ea | 1271 | int err = -EEXIST; |
41158c7e | 1272 | int mirror = 0; |
1da177e4 | 1273 | mirror_info_t *p; |
6c2fce2e NB |
1274 | int first = 0; |
1275 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1276 | |
5389042f N |
1277 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1278 | return -EBUSY; | |
1279 | ||
6c2fce2e NB |
1280 | if (rdev->raid_disk >= 0) |
1281 | first = last = rdev->raid_disk; | |
1282 | ||
1283 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1284 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1285 | ||
8f6c2e4b MP |
1286 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1287 | rdev->data_offset << 9); | |
627a2d3c N |
1288 | /* as we don't honour merge_bvec_fn, we must |
1289 | * never risk violating it, so limit | |
1290 | * ->max_segments to one lying with a single | |
1291 | * page, as a one page request is never in | |
1292 | * violation. | |
1da177e4 | 1293 | */ |
627a2d3c N |
1294 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1295 | blk_queue_max_segments(mddev->queue, 1); | |
1296 | blk_queue_segment_boundary(mddev->queue, | |
1297 | PAGE_CACHE_SIZE - 1); | |
1298 | } | |
1da177e4 LT |
1299 | |
1300 | p->head_position = 0; | |
1301 | rdev->raid_disk = mirror; | |
199050ea | 1302 | err = 0; |
6aea114a N |
1303 | /* As all devices are equivalent, we don't need a full recovery |
1304 | * if this was recently any drive of the array | |
1305 | */ | |
1306 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1307 | conf->fullsync = 1; |
d6065f7b | 1308 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1309 | break; |
1310 | } | |
ac5e7113 | 1311 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1312 | print_conf(conf); |
199050ea | 1313 | return err; |
1da177e4 LT |
1314 | } |
1315 | ||
1316 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1317 | { | |
1318 | conf_t *conf = mddev->private; | |
1319 | int err = 0; | |
1320 | mdk_rdev_t *rdev; | |
1321 | mirror_info_t *p = conf->mirrors+ number; | |
1322 | ||
1323 | print_conf(conf); | |
1324 | rdev = p->rdev; | |
1325 | if (rdev) { | |
b2d444d7 | 1326 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1327 | atomic_read(&rdev->nr_pending)) { |
1328 | err = -EBUSY; | |
1329 | goto abort; | |
1330 | } | |
046abeed | 1331 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1332 | * is not possible. |
1333 | */ | |
1334 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1335 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1336 | mddev->degraded < conf->raid_disks) { |
1337 | err = -EBUSY; | |
1338 | goto abort; | |
1339 | } | |
1da177e4 | 1340 | p->rdev = NULL; |
fbd568a3 | 1341 | synchronize_rcu(); |
1da177e4 LT |
1342 | if (atomic_read(&rdev->nr_pending)) { |
1343 | /* lost the race, try later */ | |
1344 | err = -EBUSY; | |
1345 | p->rdev = rdev; | |
ac5e7113 | 1346 | goto abort; |
1da177e4 | 1347 | } |
a91a2785 | 1348 | err = md_integrity_register(mddev); |
1da177e4 LT |
1349 | } |
1350 | abort: | |
1351 | ||
1352 | print_conf(conf); | |
1353 | return err; | |
1354 | } | |
1355 | ||
1356 | ||
6712ecf8 | 1357 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1358 | { |
7b92813c | 1359 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 1360 | |
ba3ae3be NK |
1361 | /* this will call update_head_pos() */ |
1362 | find_bio_disk(r1_bio, bio); | |
1363 | ||
1da177e4 LT |
1364 | /* |
1365 | * we have read a block, now it needs to be re-written, | |
1366 | * or re-read if the read failed. | |
1367 | * We don't do much here, just schedule handling by raid1d | |
1368 | */ | |
69382e85 | 1369 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1370 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1371 | |
1372 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1373 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1374 | } |
1375 | ||
6712ecf8 | 1376 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1377 | { |
1378 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 1379 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 1380 | mddev_t *mddev = r1_bio->mddev; |
070ec55d | 1381 | conf_t *conf = mddev->private; |
1da177e4 | 1382 | int mirror=0; |
4367af55 N |
1383 | sector_t first_bad; |
1384 | int bad_sectors; | |
1da177e4 | 1385 | |
ba3ae3be NK |
1386 | mirror = find_bio_disk(r1_bio, bio); |
1387 | ||
6b1117d5 | 1388 | if (!uptodate) { |
57dab0bd | 1389 | sector_t sync_blocks = 0; |
6b1117d5 N |
1390 | sector_t s = r1_bio->sector; |
1391 | long sectors_to_go = r1_bio->sectors; | |
1392 | /* make sure these bits doesn't get cleared. */ | |
1393 | do { | |
5e3db645 | 1394 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1395 | &sync_blocks, 1); |
1396 | s += sync_blocks; | |
1397 | sectors_to_go -= sync_blocks; | |
1398 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1399 | set_bit(WriteErrorSeen, |
1400 | &conf->mirrors[mirror].rdev->flags); | |
1401 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 N |
1402 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1403 | r1_bio->sector, | |
1404 | r1_bio->sectors, | |
3a9f28a5 N |
1405 | &first_bad, &bad_sectors) && |
1406 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1407 | r1_bio->sector, | |
1408 | r1_bio->sectors, | |
1409 | &first_bad, &bad_sectors) | |
1410 | ) | |
4367af55 | 1411 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1412 | |
1da177e4 | 1413 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1414 | int s = r1_bio->sectors; |
d8f05d29 N |
1415 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1416 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1417 | reschedule_retry(r1_bio); |
1418 | else { | |
1419 | put_buf(r1_bio); | |
1420 | md_done_sync(mddev, s, uptodate); | |
1421 | } | |
1da177e4 | 1422 | } |
1da177e4 LT |
1423 | } |
1424 | ||
d8f05d29 N |
1425 | static int r1_sync_page_io(mdk_rdev_t *rdev, sector_t sector, |
1426 | int sectors, struct page *page, int rw) | |
1427 | { | |
1428 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1429 | /* success */ | |
1430 | return 1; | |
1431 | if (rw == WRITE) | |
1432 | set_bit(WriteErrorSeen, &rdev->flags); | |
1433 | /* need to record an error - either for the block or the device */ | |
1434 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1435 | md_error(rdev->mddev, rdev); | |
1436 | return 0; | |
1437 | } | |
1438 | ||
a68e5870 | 1439 | static int fix_sync_read_error(r1bio_t *r1_bio) |
1da177e4 | 1440 | { |
a68e5870 N |
1441 | /* Try some synchronous reads of other devices to get |
1442 | * good data, much like with normal read errors. Only | |
1443 | * read into the pages we already have so we don't | |
1444 | * need to re-issue the read request. | |
1445 | * We don't need to freeze the array, because being in an | |
1446 | * active sync request, there is no normal IO, and | |
1447 | * no overlapping syncs. | |
06f60385 N |
1448 | * We don't need to check is_badblock() again as we |
1449 | * made sure that anything with a bad block in range | |
1450 | * will have bi_end_io clear. | |
a68e5870 N |
1451 | */ |
1452 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 1453 | conf_t *conf = mddev->private; |
a68e5870 N |
1454 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1455 | sector_t sect = r1_bio->sector; | |
1456 | int sectors = r1_bio->sectors; | |
1457 | int idx = 0; | |
1458 | ||
1459 | while(sectors) { | |
1460 | int s = sectors; | |
1461 | int d = r1_bio->read_disk; | |
1462 | int success = 0; | |
1463 | mdk_rdev_t *rdev; | |
78d7f5f7 | 1464 | int start; |
a68e5870 N |
1465 | |
1466 | if (s > (PAGE_SIZE>>9)) | |
1467 | s = PAGE_SIZE >> 9; | |
1468 | do { | |
1469 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1470 | /* No rcu protection needed here devices | |
1471 | * can only be removed when no resync is | |
1472 | * active, and resync is currently active | |
1473 | */ | |
1474 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1475 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1476 | bio->bi_io_vec[idx].bv_page, |
1477 | READ, false)) { | |
1478 | success = 1; | |
1479 | break; | |
1480 | } | |
1481 | } | |
1482 | d++; | |
1483 | if (d == conf->raid_disks) | |
1484 | d = 0; | |
1485 | } while (!success && d != r1_bio->read_disk); | |
1486 | ||
78d7f5f7 | 1487 | if (!success) { |
a68e5870 | 1488 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1489 | int abort = 0; |
1490 | /* Cannot read from anywhere, this block is lost. | |
1491 | * Record a bad block on each device. If that doesn't | |
1492 | * work just disable and interrupt the recovery. | |
1493 | * Don't fail devices as that won't really help. | |
1494 | */ | |
a68e5870 N |
1495 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1496 | " for block %llu\n", | |
1497 | mdname(mddev), | |
1498 | bdevname(bio->bi_bdev, b), | |
1499 | (unsigned long long)r1_bio->sector); | |
3a9f28a5 N |
1500 | for (d = 0; d < conf->raid_disks; d++) { |
1501 | rdev = conf->mirrors[d].rdev; | |
1502 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1503 | continue; | |
1504 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1505 | abort = 1; | |
1506 | } | |
1507 | if (abort) { | |
1508 | mddev->recovery_disabled = 1; | |
1509 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1510 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1511 | put_buf(r1_bio); | |
1512 | return 0; | |
1513 | } | |
1514 | /* Try next page */ | |
1515 | sectors -= s; | |
1516 | sect += s; | |
1517 | idx++; | |
1518 | continue; | |
d11c171e | 1519 | } |
78d7f5f7 N |
1520 | |
1521 | start = d; | |
1522 | /* write it back and re-read */ | |
1523 | while (d != r1_bio->read_disk) { | |
1524 | if (d == 0) | |
1525 | d = conf->raid_disks; | |
1526 | d--; | |
1527 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1528 | continue; | |
1529 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1530 | if (r1_sync_page_io(rdev, sect, s, |
1531 | bio->bi_io_vec[idx].bv_page, | |
1532 | WRITE) == 0) { | |
78d7f5f7 N |
1533 | r1_bio->bios[d]->bi_end_io = NULL; |
1534 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1535 | } |
78d7f5f7 N |
1536 | } |
1537 | d = start; | |
1538 | while (d != r1_bio->read_disk) { | |
1539 | if (d == 0) | |
1540 | d = conf->raid_disks; | |
1541 | d--; | |
1542 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1543 | continue; | |
1544 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1545 | if (r1_sync_page_io(rdev, sect, s, |
1546 | bio->bi_io_vec[idx].bv_page, | |
1547 | READ) != 0) | |
9d3d8011 | 1548 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1549 | } |
a68e5870 N |
1550 | sectors -= s; |
1551 | sect += s; | |
1552 | idx ++; | |
1553 | } | |
78d7f5f7 | 1554 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1555 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1556 | return 1; |
1557 | } | |
1558 | ||
1559 | static int process_checks(r1bio_t *r1_bio) | |
1560 | { | |
1561 | /* We have read all readable devices. If we haven't | |
1562 | * got the block, then there is no hope left. | |
1563 | * If we have, then we want to do a comparison | |
1564 | * and skip the write if everything is the same. | |
1565 | * If any blocks failed to read, then we need to | |
1566 | * attempt an over-write | |
1567 | */ | |
1568 | mddev_t *mddev = r1_bio->mddev; | |
1569 | conf_t *conf = mddev->private; | |
1570 | int primary; | |
1571 | int i; | |
1572 | ||
78d7f5f7 | 1573 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1574 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1575 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1576 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1577 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1578 | break; | |
1579 | } | |
1580 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1581 | for (i = 0; i < conf->raid_disks; i++) { |
1582 | int j; | |
1583 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1584 | struct bio *pbio = r1_bio->bios[primary]; | |
1585 | struct bio *sbio = r1_bio->bios[i]; | |
1586 | int size; | |
a68e5870 | 1587 | |
78d7f5f7 N |
1588 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1589 | continue; | |
1590 | ||
1591 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1592 | for (j = vcnt; j-- ; ) { | |
1593 | struct page *p, *s; | |
1594 | p = pbio->bi_io_vec[j].bv_page; | |
1595 | s = sbio->bi_io_vec[j].bv_page; | |
1596 | if (memcmp(page_address(p), | |
1597 | page_address(s), | |
1598 | PAGE_SIZE)) | |
1599 | break; | |
69382e85 | 1600 | } |
78d7f5f7 N |
1601 | } else |
1602 | j = 0; | |
1603 | if (j >= 0) | |
1604 | mddev->resync_mismatches += r1_bio->sectors; | |
1605 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1606 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1607 | /* No need to write to this device. */ | |
1608 | sbio->bi_end_io = NULL; | |
1609 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1610 | continue; | |
1611 | } | |
1612 | /* fixup the bio for reuse */ | |
1613 | sbio->bi_vcnt = vcnt; | |
1614 | sbio->bi_size = r1_bio->sectors << 9; | |
1615 | sbio->bi_idx = 0; | |
1616 | sbio->bi_phys_segments = 0; | |
1617 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1618 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1619 | sbio->bi_next = NULL; | |
1620 | sbio->bi_sector = r1_bio->sector + | |
1621 | conf->mirrors[i].rdev->data_offset; | |
1622 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1623 | size = sbio->bi_size; | |
1624 | for (j = 0; j < vcnt ; j++) { | |
1625 | struct bio_vec *bi; | |
1626 | bi = &sbio->bi_io_vec[j]; | |
1627 | bi->bv_offset = 0; | |
1628 | if (size > PAGE_SIZE) | |
1629 | bi->bv_len = PAGE_SIZE; | |
1630 | else | |
1631 | bi->bv_len = size; | |
1632 | size -= PAGE_SIZE; | |
1633 | memcpy(page_address(bi->bv_page), | |
1634 | page_address(pbio->bi_io_vec[j].bv_page), | |
1635 | PAGE_SIZE); | |
69382e85 | 1636 | } |
78d7f5f7 | 1637 | } |
a68e5870 N |
1638 | return 0; |
1639 | } | |
1640 | ||
1641 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1642 | { | |
1643 | conf_t *conf = mddev->private; | |
1644 | int i; | |
1645 | int disks = conf->raid_disks; | |
1646 | struct bio *bio, *wbio; | |
1647 | ||
1648 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1649 | ||
a68e5870 N |
1650 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1651 | /* ouch - failed to read all of that. */ | |
1652 | if (!fix_sync_read_error(r1_bio)) | |
1653 | return; | |
7ca78d57 N |
1654 | |
1655 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1656 | if (process_checks(r1_bio) < 0) | |
1657 | return; | |
d11c171e N |
1658 | /* |
1659 | * schedule writes | |
1660 | */ | |
1da177e4 LT |
1661 | atomic_set(&r1_bio->remaining, 1); |
1662 | for (i = 0; i < disks ; i++) { | |
1663 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1664 | if (wbio->bi_end_io == NULL || |
1665 | (wbio->bi_end_io == end_sync_read && | |
1666 | (i == r1_bio->read_disk || | |
1667 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1668 | continue; |
1669 | ||
3e198f78 N |
1670 | wbio->bi_rw = WRITE; |
1671 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1672 | atomic_inc(&r1_bio->remaining); |
1673 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1674 | |
1da177e4 LT |
1675 | generic_make_request(wbio); |
1676 | } | |
1677 | ||
1678 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1679 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1680 | md_done_sync(mddev, r1_bio->sectors, 1); |
1681 | put_buf(r1_bio); | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | /* | |
1686 | * This is a kernel thread which: | |
1687 | * | |
1688 | * 1. Retries failed read operations on working mirrors. | |
1689 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1690 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1691 | */ |
1692 | ||
867868fb N |
1693 | static void fix_read_error(conf_t *conf, int read_disk, |
1694 | sector_t sect, int sectors) | |
1695 | { | |
1696 | mddev_t *mddev = conf->mddev; | |
1697 | while(sectors) { | |
1698 | int s = sectors; | |
1699 | int d = read_disk; | |
1700 | int success = 0; | |
1701 | int start; | |
1702 | mdk_rdev_t *rdev; | |
1703 | ||
1704 | if (s > (PAGE_SIZE>>9)) | |
1705 | s = PAGE_SIZE >> 9; | |
1706 | ||
1707 | do { | |
1708 | /* Note: no rcu protection needed here | |
1709 | * as this is synchronous in the raid1d thread | |
1710 | * which is the thread that might remove | |
1711 | * a device. If raid1d ever becomes multi-threaded.... | |
1712 | */ | |
d2eb35ac N |
1713 | sector_t first_bad; |
1714 | int bad_sectors; | |
1715 | ||
867868fb N |
1716 | rdev = conf->mirrors[d].rdev; |
1717 | if (rdev && | |
1718 | test_bit(In_sync, &rdev->flags) && | |
d2eb35ac N |
1719 | is_badblock(rdev, sect, s, |
1720 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
1721 | sync_page_io(rdev, sect, s<<9, |
1722 | conf->tmppage, READ, false)) | |
867868fb N |
1723 | success = 1; |
1724 | else { | |
1725 | d++; | |
1726 | if (d == conf->raid_disks) | |
1727 | d = 0; | |
1728 | } | |
1729 | } while (!success && d != read_disk); | |
1730 | ||
1731 | if (!success) { | |
d8f05d29 N |
1732 | /* Cannot read from anywhere - mark it bad */ |
1733 | mdk_rdev_t *rdev = conf->mirrors[read_disk].rdev; | |
1734 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1735 | md_error(mddev, rdev); | |
867868fb N |
1736 | break; |
1737 | } | |
1738 | /* write it back and re-read */ | |
1739 | start = d; | |
1740 | while (d != read_disk) { | |
1741 | if (d==0) | |
1742 | d = conf->raid_disks; | |
1743 | d--; | |
1744 | rdev = conf->mirrors[d].rdev; | |
1745 | if (rdev && | |
d8f05d29 N |
1746 | test_bit(In_sync, &rdev->flags)) |
1747 | r1_sync_page_io(rdev, sect, s, | |
1748 | conf->tmppage, WRITE); | |
867868fb N |
1749 | } |
1750 | d = start; | |
1751 | while (d != read_disk) { | |
1752 | char b[BDEVNAME_SIZE]; | |
1753 | if (d==0) | |
1754 | d = conf->raid_disks; | |
1755 | d--; | |
1756 | rdev = conf->mirrors[d].rdev; | |
1757 | if (rdev && | |
1758 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
1759 | if (r1_sync_page_io(rdev, sect, s, |
1760 | conf->tmppage, READ)) { | |
867868fb N |
1761 | atomic_add(s, &rdev->corrected_errors); |
1762 | printk(KERN_INFO | |
9dd1e2fa | 1763 | "md/raid1:%s: read error corrected " |
867868fb N |
1764 | "(%d sectors at %llu on %s)\n", |
1765 | mdname(mddev), s, | |
969b755a RD |
1766 | (unsigned long long)(sect + |
1767 | rdev->data_offset), | |
867868fb N |
1768 | bdevname(rdev->bdev, b)); |
1769 | } | |
1770 | } | |
1771 | } | |
1772 | sectors -= s; | |
1773 | sect += s; | |
1774 | } | |
1775 | } | |
1776 | ||
cd5ff9a1 N |
1777 | static void bi_complete(struct bio *bio, int error) |
1778 | { | |
1779 | complete((struct completion *)bio->bi_private); | |
1780 | } | |
1781 | ||
1782 | static int submit_bio_wait(int rw, struct bio *bio) | |
1783 | { | |
1784 | struct completion event; | |
1785 | rw |= REQ_SYNC; | |
1786 | ||
1787 | init_completion(&event); | |
1788 | bio->bi_private = &event; | |
1789 | bio->bi_end_io = bi_complete; | |
1790 | submit_bio(rw, bio); | |
1791 | wait_for_completion(&event); | |
1792 | ||
1793 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1794 | } | |
1795 | ||
1796 | static int narrow_write_error(r1bio_t *r1_bio, int i) | |
1797 | { | |
1798 | mddev_t *mddev = r1_bio->mddev; | |
1799 | conf_t *conf = mddev->private; | |
1800 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; | |
1801 | int vcnt, idx; | |
1802 | struct bio_vec *vec; | |
1803 | ||
1804 | /* bio has the data to be written to device 'i' where | |
1805 | * we just recently had a write error. | |
1806 | * We repeatedly clone the bio and trim down to one block, | |
1807 | * then try the write. Where the write fails we record | |
1808 | * a bad block. | |
1809 | * It is conceivable that the bio doesn't exactly align with | |
1810 | * blocks. We must handle this somehow. | |
1811 | * | |
1812 | * We currently own a reference on the rdev. | |
1813 | */ | |
1814 | ||
1815 | int block_sectors; | |
1816 | sector_t sector; | |
1817 | int sectors; | |
1818 | int sect_to_write = r1_bio->sectors; | |
1819 | int ok = 1; | |
1820 | ||
1821 | if (rdev->badblocks.shift < 0) | |
1822 | return 0; | |
1823 | ||
1824 | block_sectors = 1 << rdev->badblocks.shift; | |
1825 | sector = r1_bio->sector; | |
1826 | sectors = ((sector + block_sectors) | |
1827 | & ~(sector_t)(block_sectors - 1)) | |
1828 | - sector; | |
1829 | ||
1830 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
1831 | vcnt = r1_bio->behind_page_count; | |
1832 | vec = r1_bio->behind_bvecs; | |
1833 | idx = 0; | |
1834 | while (vec[idx].bv_page == NULL) | |
1835 | idx++; | |
1836 | } else { | |
1837 | vcnt = r1_bio->master_bio->bi_vcnt; | |
1838 | vec = r1_bio->master_bio->bi_io_vec; | |
1839 | idx = r1_bio->master_bio->bi_idx; | |
1840 | } | |
1841 | while (sect_to_write) { | |
1842 | struct bio *wbio; | |
1843 | if (sectors > sect_to_write) | |
1844 | sectors = sect_to_write; | |
1845 | /* Write at 'sector' for 'sectors'*/ | |
1846 | ||
1847 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
1848 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
1849 | wbio->bi_sector = r1_bio->sector; | |
1850 | wbio->bi_rw = WRITE; | |
1851 | wbio->bi_vcnt = vcnt; | |
1852 | wbio->bi_size = r1_bio->sectors << 9; | |
1853 | wbio->bi_idx = idx; | |
1854 | ||
1855 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
1856 | wbio->bi_sector += rdev->data_offset; | |
1857 | wbio->bi_bdev = rdev->bdev; | |
1858 | if (submit_bio_wait(WRITE, wbio) == 0) | |
1859 | /* failure! */ | |
1860 | ok = rdev_set_badblocks(rdev, sector, | |
1861 | sectors, 0) | |
1862 | && ok; | |
1863 | ||
1864 | bio_put(wbio); | |
1865 | sect_to_write -= sectors; | |
1866 | sector += sectors; | |
1867 | sectors = block_sectors; | |
1868 | } | |
1869 | return ok; | |
1870 | } | |
1871 | ||
62096bce N |
1872 | static void handle_sync_write_finished(conf_t *conf, r1bio_t *r1_bio) |
1873 | { | |
1874 | int m; | |
1875 | int s = r1_bio->sectors; | |
1876 | for (m = 0; m < conf->raid_disks ; m++) { | |
1877 | mdk_rdev_t *rdev = conf->mirrors[m].rdev; | |
1878 | struct bio *bio = r1_bio->bios[m]; | |
1879 | if (bio->bi_end_io == NULL) | |
1880 | continue; | |
1881 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1882 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
1883 | rdev_clear_badblocks(rdev, r1_bio->sector, s); | |
1884 | } | |
1885 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
1886 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
1887 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
1888 | md_error(conf->mddev, rdev); | |
1889 | } | |
1890 | } | |
1891 | put_buf(r1_bio); | |
1892 | md_done_sync(conf->mddev, s, 1); | |
1893 | } | |
1894 | ||
1895 | static void handle_write_finished(conf_t *conf, r1bio_t *r1_bio) | |
1896 | { | |
1897 | int m; | |
1898 | for (m = 0; m < conf->raid_disks ; m++) | |
1899 | if (r1_bio->bios[m] == IO_MADE_GOOD) { | |
1900 | mdk_rdev_t *rdev = conf->mirrors[m].rdev; | |
1901 | rdev_clear_badblocks(rdev, | |
1902 | r1_bio->sector, | |
1903 | r1_bio->sectors); | |
1904 | rdev_dec_pending(rdev, conf->mddev); | |
1905 | } else if (r1_bio->bios[m] != NULL) { | |
1906 | /* This drive got a write error. We need to | |
1907 | * narrow down and record precise write | |
1908 | * errors. | |
1909 | */ | |
1910 | if (!narrow_write_error(r1_bio, m)) { | |
1911 | md_error(conf->mddev, | |
1912 | conf->mirrors[m].rdev); | |
1913 | /* an I/O failed, we can't clear the bitmap */ | |
1914 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1915 | } | |
1916 | rdev_dec_pending(conf->mirrors[m].rdev, | |
1917 | conf->mddev); | |
1918 | } | |
1919 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1920 | close_write(r1_bio); | |
1921 | raid_end_bio_io(r1_bio); | |
1922 | } | |
1923 | ||
1924 | static void handle_read_error(conf_t *conf, r1bio_t *r1_bio) | |
1925 | { | |
1926 | int disk; | |
1927 | int max_sectors; | |
1928 | mddev_t *mddev = conf->mddev; | |
1929 | struct bio *bio; | |
1930 | char b[BDEVNAME_SIZE]; | |
1931 | mdk_rdev_t *rdev; | |
1932 | ||
1933 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
1934 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1935 | * the block and we can fix it. | |
1936 | * We freeze all other IO, and try reading the block from | |
1937 | * other devices. When we find one, we re-write | |
1938 | * and check it that fixes the read error. | |
1939 | * This is all done synchronously while the array is | |
1940 | * frozen | |
1941 | */ | |
1942 | if (mddev->ro == 0) { | |
1943 | freeze_array(conf); | |
1944 | fix_read_error(conf, r1_bio->read_disk, | |
1945 | r1_bio->sector, r1_bio->sectors); | |
1946 | unfreeze_array(conf); | |
1947 | } else | |
1948 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1949 | ||
1950 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1951 | bdevname(bio->bi_bdev, b); | |
1952 | read_more: | |
1953 | disk = read_balance(conf, r1_bio, &max_sectors); | |
1954 | if (disk == -1) { | |
1955 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
1956 | " read error for block %llu\n", | |
1957 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
1958 | raid_end_bio_io(r1_bio); | |
1959 | } else { | |
1960 | const unsigned long do_sync | |
1961 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
1962 | if (bio) { | |
1963 | r1_bio->bios[r1_bio->read_disk] = | |
1964 | mddev->ro ? IO_BLOCKED : NULL; | |
1965 | bio_put(bio); | |
1966 | } | |
1967 | r1_bio->read_disk = disk; | |
1968 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
1969 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
1970 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1971 | rdev = conf->mirrors[disk].rdev; | |
1972 | printk_ratelimited(KERN_ERR | |
1973 | "md/raid1:%s: redirecting sector %llu" | |
1974 | " to other mirror: %s\n", | |
1975 | mdname(mddev), | |
1976 | (unsigned long long)r1_bio->sector, | |
1977 | bdevname(rdev->bdev, b)); | |
1978 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1979 | bio->bi_bdev = rdev->bdev; | |
1980 | bio->bi_end_io = raid1_end_read_request; | |
1981 | bio->bi_rw = READ | do_sync; | |
1982 | bio->bi_private = r1_bio; | |
1983 | if (max_sectors < r1_bio->sectors) { | |
1984 | /* Drat - have to split this up more */ | |
1985 | struct bio *mbio = r1_bio->master_bio; | |
1986 | int sectors_handled = (r1_bio->sector + max_sectors | |
1987 | - mbio->bi_sector); | |
1988 | r1_bio->sectors = max_sectors; | |
1989 | spin_lock_irq(&conf->device_lock); | |
1990 | if (mbio->bi_phys_segments == 0) | |
1991 | mbio->bi_phys_segments = 2; | |
1992 | else | |
1993 | mbio->bi_phys_segments++; | |
1994 | spin_unlock_irq(&conf->device_lock); | |
1995 | generic_make_request(bio); | |
1996 | bio = NULL; | |
1997 | ||
1998 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1999 | ||
2000 | r1_bio->master_bio = mbio; | |
2001 | r1_bio->sectors = (mbio->bi_size >> 9) | |
2002 | - sectors_handled; | |
2003 | r1_bio->state = 0; | |
2004 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2005 | r1_bio->mddev = mddev; | |
2006 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2007 | ||
2008 | goto read_more; | |
2009 | } else | |
2010 | generic_make_request(bio); | |
2011 | } | |
2012 | } | |
2013 | ||
1da177e4 LT |
2014 | static void raid1d(mddev_t *mddev) |
2015 | { | |
2016 | r1bio_t *r1_bio; | |
1da177e4 | 2017 | unsigned long flags; |
070ec55d | 2018 | conf_t *conf = mddev->private; |
1da177e4 | 2019 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2020 | struct blk_plug plug; |
1da177e4 LT |
2021 | |
2022 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2023 | |
2024 | blk_start_plug(&plug); | |
1da177e4 | 2025 | for (;;) { |
191ea9b2 | 2026 | |
c3b328ac N |
2027 | if (atomic_read(&mddev->plug_cnt) == 0) |
2028 | flush_pending_writes(conf); | |
191ea9b2 | 2029 | |
a35e63ef N |
2030 | spin_lock_irqsave(&conf->device_lock, flags); |
2031 | if (list_empty(head)) { | |
2032 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2033 | break; |
a35e63ef | 2034 | } |
1da177e4 LT |
2035 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
2036 | list_del(head->prev); | |
ddaf22ab | 2037 | conf->nr_queued--; |
1da177e4 LT |
2038 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2039 | ||
2040 | mddev = r1_bio->mddev; | |
070ec55d | 2041 | conf = mddev->private; |
4367af55 | 2042 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2043 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2044 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2045 | handle_sync_write_finished(conf, r1_bio); | |
2046 | else | |
4367af55 | 2047 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2048 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2049 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2050 | handle_write_finished(conf, r1_bio); | |
2051 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2052 | handle_read_error(conf, r1_bio); | |
2053 | else | |
d2eb35ac N |
2054 | /* just a partial read to be scheduled from separate |
2055 | * context | |
2056 | */ | |
2057 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2058 | |
1d9d5241 | 2059 | cond_resched(); |
de393cde N |
2060 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2061 | md_check_recovery(mddev); | |
1da177e4 | 2062 | } |
e1dfa0a2 | 2063 | blk_finish_plug(&plug); |
1da177e4 LT |
2064 | } |
2065 | ||
2066 | ||
2067 | static int init_resync(conf_t *conf) | |
2068 | { | |
2069 | int buffs; | |
2070 | ||
2071 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2072 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2073 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2074 | conf->poolinfo); | |
2075 | if (!conf->r1buf_pool) | |
2076 | return -ENOMEM; | |
2077 | conf->next_resync = 0; | |
2078 | return 0; | |
2079 | } | |
2080 | ||
2081 | /* | |
2082 | * perform a "sync" on one "block" | |
2083 | * | |
2084 | * We need to make sure that no normal I/O request - particularly write | |
2085 | * requests - conflict with active sync requests. | |
2086 | * | |
2087 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2088 | * that can be installed to exclude normal IO requests. | |
2089 | */ | |
2090 | ||
57afd89f | 2091 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2092 | { |
070ec55d | 2093 | conf_t *conf = mddev->private; |
1da177e4 LT |
2094 | r1bio_t *r1_bio; |
2095 | struct bio *bio; | |
2096 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2097 | int disk = -1; |
1da177e4 | 2098 | int i; |
3e198f78 N |
2099 | int wonly = -1; |
2100 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2101 | sector_t sync_blocks; |
e3b9703e | 2102 | int still_degraded = 0; |
06f60385 N |
2103 | int good_sectors = RESYNC_SECTORS; |
2104 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2105 | |
2106 | if (!conf->r1buf_pool) | |
2107 | if (init_resync(conf)) | |
57afd89f | 2108 | return 0; |
1da177e4 | 2109 | |
58c0fed4 | 2110 | max_sector = mddev->dev_sectors; |
1da177e4 | 2111 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2112 | /* If we aborted, we need to abort the |
2113 | * sync on the 'current' bitmap chunk (there will | |
2114 | * only be one in raid1 resync. | |
2115 | * We can find the current addess in mddev->curr_resync | |
2116 | */ | |
6a806c51 N |
2117 | if (mddev->curr_resync < max_sector) /* aborted */ |
2118 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2119 | &sync_blocks, 1); |
6a806c51 | 2120 | else /* completed sync */ |
191ea9b2 | 2121 | conf->fullsync = 0; |
6a806c51 N |
2122 | |
2123 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2124 | close_sync(conf); |
2125 | return 0; | |
2126 | } | |
2127 | ||
07d84d10 N |
2128 | if (mddev->bitmap == NULL && |
2129 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2130 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2131 | conf->fullsync == 0) { |
2132 | *skipped = 1; | |
2133 | return max_sector - sector_nr; | |
2134 | } | |
6394cca5 N |
2135 | /* before building a request, check if we can skip these blocks.. |
2136 | * This call the bitmap_start_sync doesn't actually record anything | |
2137 | */ | |
e3b9703e | 2138 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2139 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2140 | /* We can skip this block, and probably several more */ |
2141 | *skipped = 1; | |
2142 | return sync_blocks; | |
2143 | } | |
1da177e4 | 2144 | /* |
17999be4 N |
2145 | * If there is non-resync activity waiting for a turn, |
2146 | * and resync is going fast enough, | |
2147 | * then let it though before starting on this new sync request. | |
1da177e4 | 2148 | */ |
17999be4 | 2149 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2150 | msleep_interruptible(1000); |
17999be4 | 2151 | |
b47490c9 | 2152 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2153 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2154 | raise_barrier(conf); |
2155 | ||
2156 | conf->next_resync = sector_nr; | |
1da177e4 | 2157 | |
3e198f78 | 2158 | rcu_read_lock(); |
1da177e4 | 2159 | /* |
3e198f78 N |
2160 | * If we get a correctably read error during resync or recovery, |
2161 | * we might want to read from a different device. So we | |
2162 | * flag all drives that could conceivably be read from for READ, | |
2163 | * and any others (which will be non-In_sync devices) for WRITE. | |
2164 | * If a read fails, we try reading from something else for which READ | |
2165 | * is OK. | |
1da177e4 | 2166 | */ |
1da177e4 | 2167 | |
1da177e4 LT |
2168 | r1_bio->mddev = mddev; |
2169 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2170 | r1_bio->state = 0; |
1da177e4 | 2171 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
2172 | |
2173 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 2174 | mdk_rdev_t *rdev; |
1da177e4 LT |
2175 | bio = r1_bio->bios[i]; |
2176 | ||
2177 | /* take from bio_init */ | |
2178 | bio->bi_next = NULL; | |
db8d9d35 | 2179 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2180 | bio->bi_flags |= 1 << BIO_UPTODATE; |
db8d9d35 | 2181 | bio->bi_comp_cpu = -1; |
802ba064 | 2182 | bio->bi_rw = READ; |
1da177e4 LT |
2183 | bio->bi_vcnt = 0; |
2184 | bio->bi_idx = 0; | |
2185 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2186 | bio->bi_size = 0; |
2187 | bio->bi_end_io = NULL; | |
2188 | bio->bi_private = NULL; | |
2189 | ||
3e198f78 N |
2190 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2191 | if (rdev == NULL || | |
06f60385 | 2192 | test_bit(Faulty, &rdev->flags)) { |
e3b9703e | 2193 | still_degraded = 1; |
3e198f78 | 2194 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2195 | bio->bi_rw = WRITE; |
2196 | bio->bi_end_io = end_sync_write; | |
2197 | write_targets ++; | |
3e198f78 N |
2198 | } else { |
2199 | /* may need to read from here */ | |
06f60385 N |
2200 | sector_t first_bad = MaxSector; |
2201 | int bad_sectors; | |
2202 | ||
2203 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2204 | &first_bad, &bad_sectors)) { | |
2205 | if (first_bad > sector_nr) | |
2206 | good_sectors = first_bad - sector_nr; | |
2207 | else { | |
2208 | bad_sectors -= (sector_nr - first_bad); | |
2209 | if (min_bad == 0 || | |
2210 | min_bad > bad_sectors) | |
2211 | min_bad = bad_sectors; | |
2212 | } | |
2213 | } | |
2214 | if (sector_nr < first_bad) { | |
2215 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2216 | if (wonly < 0) | |
2217 | wonly = i; | |
2218 | } else { | |
2219 | if (disk < 0) | |
2220 | disk = i; | |
2221 | } | |
2222 | bio->bi_rw = READ; | |
2223 | bio->bi_end_io = end_sync_read; | |
2224 | read_targets++; | |
3e198f78 | 2225 | } |
3e198f78 | 2226 | } |
06f60385 N |
2227 | if (bio->bi_end_io) { |
2228 | atomic_inc(&rdev->nr_pending); | |
2229 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2230 | bio->bi_bdev = rdev->bdev; | |
2231 | bio->bi_private = r1_bio; | |
2232 | } | |
1da177e4 | 2233 | } |
3e198f78 N |
2234 | rcu_read_unlock(); |
2235 | if (disk < 0) | |
2236 | disk = wonly; | |
2237 | r1_bio->read_disk = disk; | |
191ea9b2 | 2238 | |
06f60385 N |
2239 | if (read_targets == 0 && min_bad > 0) { |
2240 | /* These sectors are bad on all InSync devices, so we | |
2241 | * need to mark them bad on all write targets | |
2242 | */ | |
2243 | int ok = 1; | |
2244 | for (i = 0 ; i < conf->raid_disks ; i++) | |
2245 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { | |
2246 | mdk_rdev_t *rdev = | |
2247 | rcu_dereference(conf->mirrors[i].rdev); | |
2248 | ok = rdev_set_badblocks(rdev, sector_nr, | |
2249 | min_bad, 0 | |
2250 | ) && ok; | |
2251 | } | |
2252 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2253 | *skipped = 1; | |
2254 | put_buf(r1_bio); | |
2255 | ||
2256 | if (!ok) { | |
2257 | /* Cannot record the badblocks, so need to | |
2258 | * abort the resync. | |
2259 | * If there are multiple read targets, could just | |
2260 | * fail the really bad ones ??? | |
2261 | */ | |
2262 | conf->recovery_disabled = mddev->recovery_disabled; | |
2263 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2264 | return 0; | |
2265 | } else | |
2266 | return min_bad; | |
2267 | ||
2268 | } | |
2269 | if (min_bad > 0 && min_bad < good_sectors) { | |
2270 | /* only resync enough to reach the next bad->good | |
2271 | * transition */ | |
2272 | good_sectors = min_bad; | |
2273 | } | |
2274 | ||
3e198f78 N |
2275 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2276 | /* extra read targets are also write targets */ | |
2277 | write_targets += read_targets-1; | |
2278 | ||
2279 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2280 | /* There is nowhere to write, so all non-sync |
2281 | * drives must be failed - so we are finished | |
2282 | */ | |
57afd89f N |
2283 | sector_t rv = max_sector - sector_nr; |
2284 | *skipped = 1; | |
1da177e4 | 2285 | put_buf(r1_bio); |
1da177e4 LT |
2286 | return rv; |
2287 | } | |
2288 | ||
c6207277 N |
2289 | if (max_sector > mddev->resync_max) |
2290 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2291 | if (max_sector > sector_nr + good_sectors) |
2292 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2293 | nr_sectors = 0; |
289e99e8 | 2294 | sync_blocks = 0; |
1da177e4 LT |
2295 | do { |
2296 | struct page *page; | |
2297 | int len = PAGE_SIZE; | |
2298 | if (sector_nr + (len>>9) > max_sector) | |
2299 | len = (max_sector - sector_nr) << 9; | |
2300 | if (len == 0) | |
2301 | break; | |
6a806c51 N |
2302 | if (sync_blocks == 0) { |
2303 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2304 | &sync_blocks, still_degraded) && |
2305 | !conf->fullsync && | |
2306 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2307 | break; |
9e77c485 | 2308 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2309 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2310 | len = sync_blocks<<9; |
ab7a30c7 | 2311 | } |
191ea9b2 | 2312 | |
1da177e4 LT |
2313 | for (i=0 ; i < conf->raid_disks; i++) { |
2314 | bio = r1_bio->bios[i]; | |
2315 | if (bio->bi_end_io) { | |
d11c171e | 2316 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2317 | if (bio_add_page(bio, page, len, 0) == 0) { |
2318 | /* stop here */ | |
d11c171e | 2319 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2320 | while (i > 0) { |
2321 | i--; | |
2322 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2323 | if (bio->bi_end_io==NULL) |
2324 | continue; | |
1da177e4 LT |
2325 | /* remove last page from this bio */ |
2326 | bio->bi_vcnt--; | |
2327 | bio->bi_size -= len; | |
2328 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2329 | } | |
2330 | goto bio_full; | |
2331 | } | |
2332 | } | |
2333 | } | |
2334 | nr_sectors += len>>9; | |
2335 | sector_nr += len>>9; | |
191ea9b2 | 2336 | sync_blocks -= (len>>9); |
1da177e4 LT |
2337 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2338 | bio_full: | |
1da177e4 LT |
2339 | r1_bio->sectors = nr_sectors; |
2340 | ||
d11c171e N |
2341 | /* For a user-requested sync, we read all readable devices and do a |
2342 | * compare | |
2343 | */ | |
2344 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2345 | atomic_set(&r1_bio->remaining, read_targets); | |
2346 | for (i=0; i<conf->raid_disks; i++) { | |
2347 | bio = r1_bio->bios[i]; | |
2348 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 2349 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2350 | generic_make_request(bio); |
2351 | } | |
2352 | } | |
2353 | } else { | |
2354 | atomic_set(&r1_bio->remaining, 1); | |
2355 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2356 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2357 | generic_make_request(bio); |
1da177e4 | 2358 | |
d11c171e | 2359 | } |
1da177e4 LT |
2360 | return nr_sectors; |
2361 | } | |
2362 | ||
80c3a6ce DW |
2363 | static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) |
2364 | { | |
2365 | if (sectors) | |
2366 | return sectors; | |
2367 | ||
2368 | return mddev->dev_sectors; | |
2369 | } | |
2370 | ||
709ae487 | 2371 | static conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
2372 | { |
2373 | conf_t *conf; | |
709ae487 | 2374 | int i; |
1da177e4 LT |
2375 | mirror_info_t *disk; |
2376 | mdk_rdev_t *rdev; | |
709ae487 | 2377 | int err = -ENOMEM; |
1da177e4 | 2378 | |
9ffae0cf | 2379 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 | 2380 | if (!conf) |
709ae487 | 2381 | goto abort; |
1da177e4 | 2382 | |
9ffae0cf | 2383 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
2384 | GFP_KERNEL); |
2385 | if (!conf->mirrors) | |
709ae487 | 2386 | goto abort; |
1da177e4 | 2387 | |
ddaf22ab N |
2388 | conf->tmppage = alloc_page(GFP_KERNEL); |
2389 | if (!conf->tmppage) | |
709ae487 | 2390 | goto abort; |
ddaf22ab | 2391 | |
709ae487 | 2392 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2393 | if (!conf->poolinfo) |
709ae487 | 2394 | goto abort; |
1da177e4 LT |
2395 | conf->poolinfo->raid_disks = mddev->raid_disks; |
2396 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2397 | r1bio_pool_free, | |
2398 | conf->poolinfo); | |
2399 | if (!conf->r1bio_pool) | |
709ae487 N |
2400 | goto abort; |
2401 | ||
ed9bfdf1 | 2402 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2403 | |
e7e72bf6 | 2404 | spin_lock_init(&conf->device_lock); |
159ec1fc | 2405 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 2406 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2407 | if (disk_idx >= mddev->raid_disks |
2408 | || disk_idx < 0) | |
2409 | continue; | |
2410 | disk = conf->mirrors + disk_idx; | |
2411 | ||
2412 | disk->rdev = rdev; | |
1da177e4 LT |
2413 | |
2414 | disk->head_position = 0; | |
1da177e4 LT |
2415 | } |
2416 | conf->raid_disks = mddev->raid_disks; | |
2417 | conf->mddev = mddev; | |
1da177e4 | 2418 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2419 | |
2420 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2421 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2422 | |
191ea9b2 | 2423 | bio_list_init(&conf->pending_bio_list); |
191ea9b2 | 2424 | |
709ae487 | 2425 | conf->last_used = -1; |
1da177e4 LT |
2426 | for (i = 0; i < conf->raid_disks; i++) { |
2427 | ||
2428 | disk = conf->mirrors + i; | |
2429 | ||
5fd6c1dc N |
2430 | if (!disk->rdev || |
2431 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2432 | disk->head_position = 0; |
918f0238 N |
2433 | if (disk->rdev) |
2434 | conf->fullsync = 1; | |
709ae487 N |
2435 | } else if (conf->last_used < 0) |
2436 | /* | |
2437 | * The first working device is used as a | |
2438 | * starting point to read balancing. | |
2439 | */ | |
2440 | conf->last_used = i; | |
1da177e4 | 2441 | } |
709ae487 N |
2442 | |
2443 | err = -EIO; | |
2444 | if (conf->last_used < 0) { | |
9dd1e2fa | 2445 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
2446 | mdname(mddev)); |
2447 | goto abort; | |
2448 | } | |
2449 | err = -ENOMEM; | |
2450 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
2451 | if (!conf->thread) { | |
2452 | printk(KERN_ERR | |
9dd1e2fa | 2453 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2454 | mdname(mddev)); |
2455 | goto abort; | |
11ce99e6 | 2456 | } |
1da177e4 | 2457 | |
709ae487 N |
2458 | return conf; |
2459 | ||
2460 | abort: | |
2461 | if (conf) { | |
2462 | if (conf->r1bio_pool) | |
2463 | mempool_destroy(conf->r1bio_pool); | |
2464 | kfree(conf->mirrors); | |
2465 | safe_put_page(conf->tmppage); | |
2466 | kfree(conf->poolinfo); | |
2467 | kfree(conf); | |
2468 | } | |
2469 | return ERR_PTR(err); | |
2470 | } | |
2471 | ||
2472 | static int run(mddev_t *mddev) | |
2473 | { | |
2474 | conf_t *conf; | |
2475 | int i; | |
2476 | mdk_rdev_t *rdev; | |
2477 | ||
2478 | if (mddev->level != 1) { | |
9dd1e2fa | 2479 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2480 | mdname(mddev), mddev->level); |
2481 | return -EIO; | |
2482 | } | |
2483 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2484 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2485 | mdname(mddev)); |
2486 | return -EIO; | |
2487 | } | |
1da177e4 | 2488 | /* |
709ae487 N |
2489 | * copy the already verified devices into our private RAID1 |
2490 | * bookkeeping area. [whatever we allocate in run(), | |
2491 | * should be freed in stop()] | |
1da177e4 | 2492 | */ |
709ae487 N |
2493 | if (mddev->private == NULL) |
2494 | conf = setup_conf(mddev); | |
2495 | else | |
2496 | conf = mddev->private; | |
1da177e4 | 2497 | |
709ae487 N |
2498 | if (IS_ERR(conf)) |
2499 | return PTR_ERR(conf); | |
1da177e4 | 2500 | |
709ae487 | 2501 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1ed7242e JB |
2502 | if (!mddev->gendisk) |
2503 | continue; | |
709ae487 N |
2504 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2505 | rdev->data_offset << 9); | |
2506 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
2507 | * violating it, so limit ->max_segments to 1 lying within |
2508 | * a single page, as a one page request is never in violation. | |
709ae487 | 2509 | */ |
627a2d3c N |
2510 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
2511 | blk_queue_max_segments(mddev->queue, 1); | |
2512 | blk_queue_segment_boundary(mddev->queue, | |
2513 | PAGE_CACHE_SIZE - 1); | |
2514 | } | |
1da177e4 | 2515 | } |
191ea9b2 | 2516 | |
709ae487 N |
2517 | mddev->degraded = 0; |
2518 | for (i=0; i < conf->raid_disks; i++) | |
2519 | if (conf->mirrors[i].rdev == NULL || | |
2520 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2521 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2522 | mddev->degraded++; | |
2523 | ||
2524 | if (conf->raid_disks - mddev->degraded == 1) | |
2525 | mddev->recovery_cp = MaxSector; | |
2526 | ||
8c6ac868 | 2527 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2528 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2529 | " -- starting background reconstruction\n", |
2530 | mdname(mddev)); | |
1da177e4 | 2531 | printk(KERN_INFO |
9dd1e2fa | 2532 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2533 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2534 | mddev->raid_disks); | |
709ae487 | 2535 | |
1da177e4 LT |
2536 | /* |
2537 | * Ok, everything is just fine now | |
2538 | */ | |
709ae487 N |
2539 | mddev->thread = conf->thread; |
2540 | conf->thread = NULL; | |
2541 | mddev->private = conf; | |
2542 | ||
1f403624 | 2543 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2544 | |
1ed7242e JB |
2545 | if (mddev->queue) { |
2546 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2547 | mddev->queue->backing_dev_info.congested_data = mddev; | |
2548 | } | |
a91a2785 | 2549 | return md_integrity_register(mddev); |
1da177e4 LT |
2550 | } |
2551 | ||
2552 | static int stop(mddev_t *mddev) | |
2553 | { | |
070ec55d | 2554 | conf_t *conf = mddev->private; |
4b6d287f | 2555 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2556 | |
2557 | /* wait for behind writes to complete */ | |
e555190d | 2558 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2559 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2560 | mdname(mddev)); | |
4b6d287f | 2561 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2562 | wait_event(bitmap->behind_wait, |
2563 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2564 | } |
1da177e4 | 2565 | |
409c57f3 N |
2566 | raise_barrier(conf); |
2567 | lower_barrier(conf); | |
2568 | ||
01f96c0a | 2569 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2570 | if (conf->r1bio_pool) |
2571 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2572 | kfree(conf->mirrors); |
2573 | kfree(conf->poolinfo); | |
1da177e4 LT |
2574 | kfree(conf); |
2575 | mddev->private = NULL; | |
2576 | return 0; | |
2577 | } | |
2578 | ||
2579 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2580 | { | |
2581 | /* no resync is happening, and there is enough space | |
2582 | * on all devices, so we can resize. | |
2583 | * We need to make sure resync covers any new space. | |
2584 | * If the array is shrinking we should possibly wait until | |
2585 | * any io in the removed space completes, but it hardly seems | |
2586 | * worth it. | |
2587 | */ | |
1f403624 | 2588 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2589 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2590 | return -EINVAL; | |
f233ea5c | 2591 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2592 | revalidate_disk(mddev->gendisk); |
b522adcd | 2593 | if (sectors > mddev->dev_sectors && |
b098636c | 2594 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2595 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2596 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2597 | } | |
b522adcd | 2598 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2599 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2600 | return 0; |
2601 | } | |
2602 | ||
63c70c4f | 2603 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2604 | { |
2605 | /* We need to: | |
2606 | * 1/ resize the r1bio_pool | |
2607 | * 2/ resize conf->mirrors | |
2608 | * | |
2609 | * We allocate a new r1bio_pool if we can. | |
2610 | * Then raise a device barrier and wait until all IO stops. | |
2611 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2612 | * |
2613 | * At the same time, we "pack" the devices so that all the missing | |
2614 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2615 | */ |
2616 | mempool_t *newpool, *oldpool; | |
2617 | struct pool_info *newpoolinfo; | |
2618 | mirror_info_t *newmirrors; | |
070ec55d | 2619 | conf_t *conf = mddev->private; |
63c70c4f | 2620 | int cnt, raid_disks; |
c04be0aa | 2621 | unsigned long flags; |
b5470dc5 | 2622 | int d, d2, err; |
1da177e4 | 2623 | |
63c70c4f | 2624 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2625 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2626 | mddev->layout != mddev->new_layout || |
2627 | mddev->level != mddev->new_level) { | |
664e7c41 | 2628 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2629 | mddev->new_layout = mddev->layout; |
2630 | mddev->new_level = mddev->level; | |
2631 | return -EINVAL; | |
2632 | } | |
2633 | ||
b5470dc5 DW |
2634 | err = md_allow_write(mddev); |
2635 | if (err) | |
2636 | return err; | |
2a2275d6 | 2637 | |
63c70c4f N |
2638 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2639 | ||
6ea9c07c N |
2640 | if (raid_disks < conf->raid_disks) { |
2641 | cnt=0; | |
2642 | for (d= 0; d < conf->raid_disks; d++) | |
2643 | if (conf->mirrors[d].rdev) | |
2644 | cnt++; | |
2645 | if (cnt > raid_disks) | |
1da177e4 | 2646 | return -EBUSY; |
6ea9c07c | 2647 | } |
1da177e4 LT |
2648 | |
2649 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2650 | if (!newpoolinfo) | |
2651 | return -ENOMEM; | |
2652 | newpoolinfo->mddev = mddev; | |
2653 | newpoolinfo->raid_disks = raid_disks; | |
2654 | ||
2655 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2656 | r1bio_pool_free, newpoolinfo); | |
2657 | if (!newpool) { | |
2658 | kfree(newpoolinfo); | |
2659 | return -ENOMEM; | |
2660 | } | |
9ffae0cf | 2661 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2662 | if (!newmirrors) { |
2663 | kfree(newpoolinfo); | |
2664 | mempool_destroy(newpool); | |
2665 | return -ENOMEM; | |
2666 | } | |
1da177e4 | 2667 | |
17999be4 | 2668 | raise_barrier(conf); |
1da177e4 LT |
2669 | |
2670 | /* ok, everything is stopped */ | |
2671 | oldpool = conf->r1bio_pool; | |
2672 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2673 | |
a88aa786 N |
2674 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2675 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2676 | if (rdev && rdev->raid_disk != d2) { | |
36fad858 | 2677 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2678 | rdev->raid_disk = d2; |
36fad858 NK |
2679 | sysfs_unlink_rdev(mddev, rdev); |
2680 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2681 | printk(KERN_WARNING |
36fad858 NK |
2682 | "md/raid1:%s: cannot register rd%d\n", |
2683 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2684 | } |
a88aa786 N |
2685 | if (rdev) |
2686 | newmirrors[d2++].rdev = rdev; | |
2687 | } | |
1da177e4 LT |
2688 | kfree(conf->mirrors); |
2689 | conf->mirrors = newmirrors; | |
2690 | kfree(conf->poolinfo); | |
2691 | conf->poolinfo = newpoolinfo; | |
2692 | ||
c04be0aa | 2693 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2694 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2695 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2696 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2697 | mddev->delta_disks = 0; |
1da177e4 | 2698 | |
6ea9c07c | 2699 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2700 | lower_barrier(conf); |
1da177e4 LT |
2701 | |
2702 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2703 | md_wakeup_thread(mddev->thread); | |
2704 | ||
2705 | mempool_destroy(oldpool); | |
2706 | return 0; | |
2707 | } | |
2708 | ||
500af87a | 2709 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 | 2710 | { |
070ec55d | 2711 | conf_t *conf = mddev->private; |
36fa3063 N |
2712 | |
2713 | switch(state) { | |
6eef4b21 N |
2714 | case 2: /* wake for suspend */ |
2715 | wake_up(&conf->wait_barrier); | |
2716 | break; | |
9e6603da | 2717 | case 1: |
17999be4 | 2718 | raise_barrier(conf); |
36fa3063 | 2719 | break; |
9e6603da | 2720 | case 0: |
17999be4 | 2721 | lower_barrier(conf); |
36fa3063 N |
2722 | break; |
2723 | } | |
36fa3063 N |
2724 | } |
2725 | ||
709ae487 N |
2726 | static void *raid1_takeover(mddev_t *mddev) |
2727 | { | |
2728 | /* raid1 can take over: | |
2729 | * raid5 with 2 devices, any layout or chunk size | |
2730 | */ | |
2731 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
2732 | conf_t *conf; | |
2733 | mddev->new_level = 1; | |
2734 | mddev->new_layout = 0; | |
2735 | mddev->new_chunk_sectors = 0; | |
2736 | conf = setup_conf(mddev); | |
2737 | if (!IS_ERR(conf)) | |
2738 | conf->barrier = 1; | |
2739 | return conf; | |
2740 | } | |
2741 | return ERR_PTR(-EINVAL); | |
2742 | } | |
1da177e4 | 2743 | |
2604b703 | 2744 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2745 | { |
2746 | .name = "raid1", | |
2604b703 | 2747 | .level = 1, |
1da177e4 LT |
2748 | .owner = THIS_MODULE, |
2749 | .make_request = make_request, | |
2750 | .run = run, | |
2751 | .stop = stop, | |
2752 | .status = status, | |
2753 | .error_handler = error, | |
2754 | .hot_add_disk = raid1_add_disk, | |
2755 | .hot_remove_disk= raid1_remove_disk, | |
2756 | .spare_active = raid1_spare_active, | |
2757 | .sync_request = sync_request, | |
2758 | .resize = raid1_resize, | |
80c3a6ce | 2759 | .size = raid1_size, |
63c70c4f | 2760 | .check_reshape = raid1_reshape, |
36fa3063 | 2761 | .quiesce = raid1_quiesce, |
709ae487 | 2762 | .takeover = raid1_takeover, |
1da177e4 LT |
2763 | }; |
2764 | ||
2765 | static int __init raid_init(void) | |
2766 | { | |
2604b703 | 2767 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2768 | } |
2769 | ||
2770 | static void raid_exit(void) | |
2771 | { | |
2604b703 | 2772 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2773 | } |
2774 | ||
2775 | module_init(raid_init); | |
2776 | module_exit(raid_exit); | |
2777 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2778 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2779 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2780 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2781 | MODULE_ALIAS("md-level-1"); |