Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
43b2e5d8 | 40 | #include "md.h" |
ef740c37 CH |
41 | #include "raid1.h" |
42 | #include "bitmap.h" | |
191ea9b2 | 43 | |
1da177e4 LT |
44 | /* |
45 | * Number of guaranteed r1bios in case of extreme VM load: | |
46 | */ | |
47 | #define NR_RAID1_BIOS 256 | |
48 | ||
473e87ce JB |
49 | /* when we get a read error on a read-only array, we redirect to another |
50 | * device without failing the first device, or trying to over-write to | |
51 | * correct the read error. To keep track of bad blocks on a per-bio | |
52 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
53 | */ | |
54 | #define IO_BLOCKED ((struct bio *)1) | |
55 | /* When we successfully write to a known bad-block, we need to remove the | |
56 | * bad-block marking which must be done from process context. So we record | |
57 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
58 | */ | |
59 | #define IO_MADE_GOOD ((struct bio *)2) | |
60 | ||
61 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
62 | ||
34db0cd6 N |
63 | /* When there are this many requests queue to be written by |
64 | * the raid1 thread, we become 'congested' to provide back-pressure | |
65 | * for writeback. | |
66 | */ | |
67 | static int max_queued_requests = 1024; | |
1da177e4 | 68 | |
e8096360 N |
69 | static void allow_barrier(struct r1conf *conf); |
70 | static void lower_barrier(struct r1conf *conf); | |
1da177e4 | 71 | |
dd0fc66f | 72 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
73 | { |
74 | struct pool_info *pi = data; | |
9f2c9d12 | 75 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
76 | |
77 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 78 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
79 | } |
80 | ||
81 | static void r1bio_pool_free(void *r1_bio, void *data) | |
82 | { | |
83 | kfree(r1_bio); | |
84 | } | |
85 | ||
86 | #define RESYNC_BLOCK_SIZE (64*1024) | |
87 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
88 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
89 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
90 | #define RESYNC_WINDOW (2048*1024) | |
91 | ||
dd0fc66f | 92 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
93 | { |
94 | struct pool_info *pi = data; | |
95 | struct page *page; | |
9f2c9d12 | 96 | struct r1bio *r1_bio; |
1da177e4 LT |
97 | struct bio *bio; |
98 | int i, j; | |
99 | ||
100 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 101 | if (!r1_bio) |
1da177e4 | 102 | return NULL; |
1da177e4 LT |
103 | |
104 | /* | |
105 | * Allocate bios : 1 for reading, n-1 for writing | |
106 | */ | |
107 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 108 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
109 | if (!bio) |
110 | goto out_free_bio; | |
111 | r1_bio->bios[j] = bio; | |
112 | } | |
113 | /* | |
114 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
115 | * the first bio. |
116 | * If this is a user-requested check/repair, allocate | |
117 | * RESYNC_PAGES for each bio. | |
1da177e4 | 118 | */ |
d11c171e N |
119 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
120 | j = pi->raid_disks; | |
121 | else | |
122 | j = 1; | |
123 | while(j--) { | |
124 | bio = r1_bio->bios[j]; | |
125 | for (i = 0; i < RESYNC_PAGES; i++) { | |
126 | page = alloc_page(gfp_flags); | |
127 | if (unlikely(!page)) | |
128 | goto out_free_pages; | |
129 | ||
130 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 131 | bio->bi_vcnt = i+1; |
d11c171e N |
132 | } |
133 | } | |
134 | /* If not user-requests, copy the page pointers to all bios */ | |
135 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
136 | for (i=0; i<RESYNC_PAGES ; i++) | |
137 | for (j=1; j<pi->raid_disks; j++) | |
138 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
139 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
140 | } |
141 | ||
142 | r1_bio->master_bio = NULL; | |
143 | ||
144 | return r1_bio; | |
145 | ||
146 | out_free_pages: | |
303a0e11 N |
147 | for (j=0 ; j < pi->raid_disks; j++) |
148 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
149 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 150 | j = -1; |
1da177e4 | 151 | out_free_bio: |
8f19ccb2 | 152 | while (++j < pi->raid_disks) |
1da177e4 LT |
153 | bio_put(r1_bio->bios[j]); |
154 | r1bio_pool_free(r1_bio, data); | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
159 | { | |
160 | struct pool_info *pi = data; | |
d11c171e | 161 | int i,j; |
9f2c9d12 | 162 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 163 | |
d11c171e N |
164 | for (i = 0; i < RESYNC_PAGES; i++) |
165 | for (j = pi->raid_disks; j-- ;) { | |
166 | if (j == 0 || | |
167 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
168 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 169 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 170 | } |
1da177e4 LT |
171 | for (i=0 ; i < pi->raid_disks; i++) |
172 | bio_put(r1bio->bios[i]); | |
173 | ||
174 | r1bio_pool_free(r1bio, data); | |
175 | } | |
176 | ||
e8096360 | 177 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
178 | { |
179 | int i; | |
180 | ||
8f19ccb2 | 181 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 182 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 183 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
184 | bio_put(*bio); |
185 | *bio = NULL; | |
186 | } | |
187 | } | |
188 | ||
9f2c9d12 | 189 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 190 | { |
e8096360 | 191 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 192 | |
1da177e4 LT |
193 | put_all_bios(conf, r1_bio); |
194 | mempool_free(r1_bio, conf->r1bio_pool); | |
195 | } | |
196 | ||
9f2c9d12 | 197 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 198 | { |
e8096360 | 199 | struct r1conf *conf = r1_bio->mddev->private; |
3e198f78 N |
200 | int i; |
201 | ||
8f19ccb2 | 202 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
203 | struct bio *bio = r1_bio->bios[i]; |
204 | if (bio->bi_end_io) | |
205 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
206 | } | |
1da177e4 LT |
207 | |
208 | mempool_free(r1_bio, conf->r1buf_pool); | |
209 | ||
17999be4 | 210 | lower_barrier(conf); |
1da177e4 LT |
211 | } |
212 | ||
9f2c9d12 | 213 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
214 | { |
215 | unsigned long flags; | |
fd01b88c | 216 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 217 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
218 | |
219 | spin_lock_irqsave(&conf->device_lock, flags); | |
220 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 221 | conf->nr_queued ++; |
1da177e4 LT |
222 | spin_unlock_irqrestore(&conf->device_lock, flags); |
223 | ||
17999be4 | 224 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
225 | md_wakeup_thread(mddev->thread); |
226 | } | |
227 | ||
228 | /* | |
229 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
230 | * operation and are ready to return a success/failure code to the buffer | |
231 | * cache layer. | |
232 | */ | |
9f2c9d12 | 233 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
234 | { |
235 | struct bio *bio = r1_bio->master_bio; | |
236 | int done; | |
e8096360 | 237 | struct r1conf *conf = r1_bio->mddev->private; |
d2eb35ac N |
238 | |
239 | if (bio->bi_phys_segments) { | |
240 | unsigned long flags; | |
241 | spin_lock_irqsave(&conf->device_lock, flags); | |
242 | bio->bi_phys_segments--; | |
243 | done = (bio->bi_phys_segments == 0); | |
244 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
245 | } else | |
246 | done = 1; | |
247 | ||
248 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
249 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
250 | if (done) { | |
251 | bio_endio(bio, 0); | |
252 | /* | |
253 | * Wake up any possible resync thread that waits for the device | |
254 | * to go idle. | |
255 | */ | |
256 | allow_barrier(conf); | |
257 | } | |
258 | } | |
259 | ||
9f2c9d12 | 260 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
261 | { |
262 | struct bio *bio = r1_bio->master_bio; | |
263 | ||
4b6d287f N |
264 | /* if nobody has done the final endio yet, do it now */ |
265 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
266 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
267 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
268 | (unsigned long long) bio->bi_sector, | |
269 | (unsigned long long) bio->bi_sector + | |
270 | (bio->bi_size >> 9) - 1); | |
4b6d287f | 271 | |
d2eb35ac | 272 | call_bio_endio(r1_bio); |
4b6d287f | 273 | } |
1da177e4 LT |
274 | free_r1bio(r1_bio); |
275 | } | |
276 | ||
277 | /* | |
278 | * Update disk head position estimator based on IRQ completion info. | |
279 | */ | |
9f2c9d12 | 280 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 281 | { |
e8096360 | 282 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
283 | |
284 | conf->mirrors[disk].head_position = | |
285 | r1_bio->sector + (r1_bio->sectors); | |
286 | } | |
287 | ||
ba3ae3be NK |
288 | /* |
289 | * Find the disk number which triggered given bio | |
290 | */ | |
9f2c9d12 | 291 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
292 | { |
293 | int mirror; | |
30194636 N |
294 | struct r1conf *conf = r1_bio->mddev->private; |
295 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 296 | |
8f19ccb2 | 297 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
298 | if (r1_bio->bios[mirror] == bio) |
299 | break; | |
300 | ||
8f19ccb2 | 301 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
302 | update_head_pos(mirror, r1_bio); |
303 | ||
304 | return mirror; | |
305 | } | |
306 | ||
6712ecf8 | 307 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
308 | { |
309 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 310 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 311 | int mirror; |
e8096360 | 312 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 313 | |
1da177e4 LT |
314 | mirror = r1_bio->read_disk; |
315 | /* | |
316 | * this branch is our 'one mirror IO has finished' event handler: | |
317 | */ | |
ddaf22ab N |
318 | update_head_pos(mirror, r1_bio); |
319 | ||
dd00a99e N |
320 | if (uptodate) |
321 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
322 | else { | |
323 | /* If all other devices have failed, we want to return | |
324 | * the error upwards rather than fail the last device. | |
325 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 326 | */ |
dd00a99e N |
327 | unsigned long flags; |
328 | spin_lock_irqsave(&conf->device_lock, flags); | |
329 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
330 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
331 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
332 | uptodate = 1; | |
333 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
334 | } | |
1da177e4 | 335 | |
dd00a99e | 336 | if (uptodate) |
1da177e4 | 337 | raid_end_bio_io(r1_bio); |
dd00a99e | 338 | else { |
1da177e4 LT |
339 | /* |
340 | * oops, read error: | |
341 | */ | |
342 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
343 | printk_ratelimited( |
344 | KERN_ERR "md/raid1:%s: %s: " | |
345 | "rescheduling sector %llu\n", | |
346 | mdname(conf->mddev), | |
347 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
348 | b), | |
349 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 350 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 LT |
351 | reschedule_retry(r1_bio); |
352 | } | |
353 | ||
354 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
355 | } |
356 | ||
9f2c9d12 | 357 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
358 | { |
359 | /* it really is the end of this request */ | |
360 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
361 | /* free extra copy of the data pages */ | |
362 | int i = r1_bio->behind_page_count; | |
363 | while (i--) | |
364 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
365 | kfree(r1_bio->behind_bvecs); | |
366 | r1_bio->behind_bvecs = NULL; | |
367 | } | |
368 | /* clear the bitmap if all writes complete successfully */ | |
369 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
370 | r1_bio->sectors, | |
371 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
372 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
373 | md_write_end(r1_bio->mddev); | |
374 | } | |
375 | ||
9f2c9d12 | 376 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 377 | { |
cd5ff9a1 N |
378 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
379 | return; | |
380 | ||
381 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
382 | reschedule_retry(r1_bio); | |
383 | else { | |
384 | close_write(r1_bio); | |
4367af55 N |
385 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
386 | reschedule_retry(r1_bio); | |
387 | else | |
388 | raid_end_bio_io(r1_bio); | |
4e78064f N |
389 | } |
390 | } | |
391 | ||
6712ecf8 | 392 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
393 | { |
394 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 395 | struct r1bio *r1_bio = bio->bi_private; |
a9701a30 | 396 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 397 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 398 | struct bio *to_put = NULL; |
1da177e4 | 399 | |
ba3ae3be | 400 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 401 | |
e9c7469b TH |
402 | /* |
403 | * 'one mirror IO has finished' event handler: | |
404 | */ | |
e9c7469b | 405 | if (!uptodate) { |
cd5ff9a1 N |
406 | set_bit(WriteErrorSeen, |
407 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
408 | if (!test_and_set_bit(WantReplacement, |
409 | &conf->mirrors[mirror].rdev->flags)) | |
410 | set_bit(MD_RECOVERY_NEEDED, & | |
411 | conf->mddev->recovery); | |
412 | ||
cd5ff9a1 | 413 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 | 414 | } else { |
1da177e4 | 415 | /* |
e9c7469b TH |
416 | * Set R1BIO_Uptodate in our master bio, so that we |
417 | * will return a good error code for to the higher | |
418 | * levels even if IO on some other mirrored buffer | |
419 | * fails. | |
420 | * | |
421 | * The 'master' represents the composite IO operation | |
422 | * to user-side. So if something waits for IO, then it | |
423 | * will wait for the 'master' bio. | |
1da177e4 | 424 | */ |
4367af55 N |
425 | sector_t first_bad; |
426 | int bad_sectors; | |
427 | ||
cd5ff9a1 N |
428 | r1_bio->bios[mirror] = NULL; |
429 | to_put = bio; | |
e9c7469b TH |
430 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
431 | ||
4367af55 N |
432 | /* Maybe we can clear some bad blocks. */ |
433 | if (is_badblock(conf->mirrors[mirror].rdev, | |
434 | r1_bio->sector, r1_bio->sectors, | |
435 | &first_bad, &bad_sectors)) { | |
436 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
437 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
438 | } | |
439 | } | |
440 | ||
e9c7469b TH |
441 | if (behind) { |
442 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
443 | atomic_dec(&r1_bio->behind_remaining); | |
444 | ||
445 | /* | |
446 | * In behind mode, we ACK the master bio once the I/O | |
447 | * has safely reached all non-writemostly | |
448 | * disks. Setting the Returned bit ensures that this | |
449 | * gets done only once -- we don't ever want to return | |
450 | * -EIO here, instead we'll wait | |
451 | */ | |
452 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
453 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
454 | /* Maybe we can return now */ | |
455 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
456 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
457 | pr_debug("raid1: behind end write sectors" |
458 | " %llu-%llu\n", | |
459 | (unsigned long long) mbio->bi_sector, | |
460 | (unsigned long long) mbio->bi_sector + | |
461 | (mbio->bi_size >> 9) - 1); | |
d2eb35ac | 462 | call_bio_endio(r1_bio); |
4b6d287f N |
463 | } |
464 | } | |
465 | } | |
4367af55 N |
466 | if (r1_bio->bios[mirror] == NULL) |
467 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
468 | conf->mddev); | |
e9c7469b | 469 | |
1da177e4 | 470 | /* |
1da177e4 LT |
471 | * Let's see if all mirrored write operations have finished |
472 | * already. | |
473 | */ | |
af6d7b76 | 474 | r1_bio_write_done(r1_bio); |
c70810b3 | 475 | |
04b857f7 N |
476 | if (to_put) |
477 | bio_put(to_put); | |
1da177e4 LT |
478 | } |
479 | ||
480 | ||
481 | /* | |
482 | * This routine returns the disk from which the requested read should | |
483 | * be done. There is a per-array 'next expected sequential IO' sector | |
484 | * number - if this matches on the next IO then we use the last disk. | |
485 | * There is also a per-disk 'last know head position' sector that is | |
486 | * maintained from IRQ contexts, both the normal and the resync IO | |
487 | * completion handlers update this position correctly. If there is no | |
488 | * perfect sequential match then we pick the disk whose head is closest. | |
489 | * | |
490 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
491 | * because position is mirror, not device based. | |
492 | * | |
493 | * The rdev for the device selected will have nr_pending incremented. | |
494 | */ | |
e8096360 | 495 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 496 | { |
af3a2cd6 | 497 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
498 | int sectors; |
499 | int best_good_sectors; | |
9dedf603 SL |
500 | int best_disk, best_dist_disk, best_pending_disk; |
501 | int has_nonrot_disk; | |
be4d3280 | 502 | int disk; |
76073054 | 503 | sector_t best_dist; |
9dedf603 | 504 | unsigned int min_pending; |
3cb03002 | 505 | struct md_rdev *rdev; |
f3ac8bf7 | 506 | int choose_first; |
1da177e4 LT |
507 | |
508 | rcu_read_lock(); | |
509 | /* | |
8ddf9efe | 510 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
511 | * device if no resync is going on, or below the resync window. |
512 | * We take the first readable disk when above the resync window. | |
513 | */ | |
514 | retry: | |
d2eb35ac | 515 | sectors = r1_bio->sectors; |
76073054 | 516 | best_disk = -1; |
9dedf603 | 517 | best_dist_disk = -1; |
76073054 | 518 | best_dist = MaxSector; |
9dedf603 SL |
519 | best_pending_disk = -1; |
520 | min_pending = UINT_MAX; | |
d2eb35ac | 521 | best_good_sectors = 0; |
9dedf603 | 522 | has_nonrot_disk = 0; |
d2eb35ac | 523 | |
1da177e4 | 524 | if (conf->mddev->recovery_cp < MaxSector && |
be4d3280 | 525 | (this_sector + sectors >= conf->next_resync)) |
f3ac8bf7 | 526 | choose_first = 1; |
be4d3280 | 527 | else |
f3ac8bf7 | 528 | choose_first = 0; |
1da177e4 | 529 | |
be4d3280 | 530 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 531 | sector_t dist; |
d2eb35ac N |
532 | sector_t first_bad; |
533 | int bad_sectors; | |
9dedf603 | 534 | unsigned int pending; |
d2eb35ac | 535 | |
f3ac8bf7 N |
536 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
537 | if (r1_bio->bios[disk] == IO_BLOCKED | |
538 | || rdev == NULL | |
6b740b8d | 539 | || test_bit(Unmerged, &rdev->flags) |
76073054 | 540 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 541 | continue; |
76073054 N |
542 | if (!test_bit(In_sync, &rdev->flags) && |
543 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 544 | continue; |
76073054 N |
545 | if (test_bit(WriteMostly, &rdev->flags)) { |
546 | /* Don't balance among write-mostly, just | |
547 | * use the first as a last resort */ | |
307729c8 N |
548 | if (best_disk < 0) { |
549 | if (is_badblock(rdev, this_sector, sectors, | |
550 | &first_bad, &bad_sectors)) { | |
551 | if (first_bad < this_sector) | |
552 | /* Cannot use this */ | |
553 | continue; | |
554 | best_good_sectors = first_bad - this_sector; | |
555 | } else | |
556 | best_good_sectors = sectors; | |
76073054 | 557 | best_disk = disk; |
307729c8 | 558 | } |
76073054 N |
559 | continue; |
560 | } | |
561 | /* This is a reasonable device to use. It might | |
562 | * even be best. | |
563 | */ | |
d2eb35ac N |
564 | if (is_badblock(rdev, this_sector, sectors, |
565 | &first_bad, &bad_sectors)) { | |
566 | if (best_dist < MaxSector) | |
567 | /* already have a better device */ | |
568 | continue; | |
569 | if (first_bad <= this_sector) { | |
570 | /* cannot read here. If this is the 'primary' | |
571 | * device, then we must not read beyond | |
572 | * bad_sectors from another device.. | |
573 | */ | |
574 | bad_sectors -= (this_sector - first_bad); | |
575 | if (choose_first && sectors > bad_sectors) | |
576 | sectors = bad_sectors; | |
577 | if (best_good_sectors > sectors) | |
578 | best_good_sectors = sectors; | |
579 | ||
580 | } else { | |
581 | sector_t good_sectors = first_bad - this_sector; | |
582 | if (good_sectors > best_good_sectors) { | |
583 | best_good_sectors = good_sectors; | |
584 | best_disk = disk; | |
585 | } | |
586 | if (choose_first) | |
587 | break; | |
588 | } | |
589 | continue; | |
590 | } else | |
591 | best_good_sectors = sectors; | |
592 | ||
9dedf603 SL |
593 | has_nonrot_disk |= blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
594 | pending = atomic_read(&rdev->nr_pending); | |
76073054 N |
595 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
596 | if (choose_first | |
597 | /* Don't change to another disk for sequential reads */ | |
be4d3280 | 598 | || conf->mirrors[disk].next_seq_sect == this_sector |
76073054 N |
599 | || dist == 0 |
600 | /* If device is idle, use it */ | |
9dedf603 | 601 | || pending == 0) { |
76073054 | 602 | best_disk = disk; |
1da177e4 LT |
603 | break; |
604 | } | |
9dedf603 SL |
605 | |
606 | if (min_pending > pending) { | |
607 | min_pending = pending; | |
608 | best_pending_disk = disk; | |
609 | } | |
610 | ||
76073054 N |
611 | if (dist < best_dist) { |
612 | best_dist = dist; | |
9dedf603 | 613 | best_dist_disk = disk; |
1da177e4 | 614 | } |
f3ac8bf7 | 615 | } |
1da177e4 | 616 | |
9dedf603 SL |
617 | /* |
618 | * If all disks are rotational, choose the closest disk. If any disk is | |
619 | * non-rotational, choose the disk with less pending request even the | |
620 | * disk is rotational, which might/might not be optimal for raids with | |
621 | * mixed ratation/non-rotational disks depending on workload. | |
622 | */ | |
623 | if (best_disk == -1) { | |
624 | if (has_nonrot_disk) | |
625 | best_disk = best_pending_disk; | |
626 | else | |
627 | best_disk = best_dist_disk; | |
628 | } | |
629 | ||
76073054 N |
630 | if (best_disk >= 0) { |
631 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
632 | if (!rdev) |
633 | goto retry; | |
634 | atomic_inc(&rdev->nr_pending); | |
76073054 | 635 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
636 | /* cannot risk returning a device that failed |
637 | * before we inc'ed nr_pending | |
638 | */ | |
03c902e1 | 639 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
640 | goto retry; |
641 | } | |
d2eb35ac | 642 | sectors = best_good_sectors; |
be4d3280 | 643 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
644 | } |
645 | rcu_read_unlock(); | |
d2eb35ac | 646 | *max_sectors = sectors; |
1da177e4 | 647 | |
76073054 | 648 | return best_disk; |
1da177e4 LT |
649 | } |
650 | ||
6b740b8d N |
651 | static int raid1_mergeable_bvec(struct request_queue *q, |
652 | struct bvec_merge_data *bvm, | |
653 | struct bio_vec *biovec) | |
654 | { | |
655 | struct mddev *mddev = q->queuedata; | |
656 | struct r1conf *conf = mddev->private; | |
657 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); | |
658 | int max = biovec->bv_len; | |
659 | ||
660 | if (mddev->merge_check_needed) { | |
661 | int disk; | |
662 | rcu_read_lock(); | |
663 | for (disk = 0; disk < conf->raid_disks * 2; disk++) { | |
664 | struct md_rdev *rdev = rcu_dereference( | |
665 | conf->mirrors[disk].rdev); | |
666 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
667 | struct request_queue *q = | |
668 | bdev_get_queue(rdev->bdev); | |
669 | if (q->merge_bvec_fn) { | |
670 | bvm->bi_sector = sector + | |
671 | rdev->data_offset; | |
672 | bvm->bi_bdev = rdev->bdev; | |
673 | max = min(max, q->merge_bvec_fn( | |
674 | q, bvm, biovec)); | |
675 | } | |
676 | } | |
677 | } | |
678 | rcu_read_unlock(); | |
679 | } | |
680 | return max; | |
681 | ||
682 | } | |
683 | ||
fd01b88c | 684 | int md_raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 685 | { |
e8096360 | 686 | struct r1conf *conf = mddev->private; |
0d129228 N |
687 | int i, ret = 0; |
688 | ||
34db0cd6 N |
689 | if ((bits & (1 << BDI_async_congested)) && |
690 | conf->pending_count >= max_queued_requests) | |
691 | return 1; | |
692 | ||
0d129228 | 693 | rcu_read_lock(); |
f53e29fc | 694 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 695 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 696 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 697 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 698 | |
1ed7242e JB |
699 | BUG_ON(!q); |
700 | ||
0d129228 N |
701 | /* Note the '|| 1' - when read_balance prefers |
702 | * non-congested targets, it can be removed | |
703 | */ | |
91a9e99d | 704 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
705 | ret |= bdi_congested(&q->backing_dev_info, bits); |
706 | else | |
707 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
708 | } | |
709 | } | |
710 | rcu_read_unlock(); | |
711 | return ret; | |
712 | } | |
1ed7242e | 713 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 714 | |
1ed7242e JB |
715 | static int raid1_congested(void *data, int bits) |
716 | { | |
fd01b88c | 717 | struct mddev *mddev = data; |
1ed7242e JB |
718 | |
719 | return mddev_congested(mddev, bits) || | |
720 | md_raid1_congested(mddev, bits); | |
721 | } | |
0d129228 | 722 | |
e8096360 | 723 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
724 | { |
725 | /* Any writes that have been queued but are awaiting | |
726 | * bitmap updates get flushed here. | |
a35e63ef | 727 | */ |
a35e63ef N |
728 | spin_lock_irq(&conf->device_lock); |
729 | ||
730 | if (conf->pending_bio_list.head) { | |
731 | struct bio *bio; | |
732 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 733 | conf->pending_count = 0; |
a35e63ef N |
734 | spin_unlock_irq(&conf->device_lock); |
735 | /* flush any pending bitmap writes to | |
736 | * disk before proceeding w/ I/O */ | |
737 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 738 | wake_up(&conf->wait_barrier); |
a35e63ef N |
739 | |
740 | while (bio) { /* submit pending writes */ | |
741 | struct bio *next = bio->bi_next; | |
742 | bio->bi_next = NULL; | |
743 | generic_make_request(bio); | |
744 | bio = next; | |
745 | } | |
a35e63ef N |
746 | } else |
747 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
748 | } |
749 | ||
17999be4 N |
750 | /* Barriers.... |
751 | * Sometimes we need to suspend IO while we do something else, | |
752 | * either some resync/recovery, or reconfigure the array. | |
753 | * To do this we raise a 'barrier'. | |
754 | * The 'barrier' is a counter that can be raised multiple times | |
755 | * to count how many activities are happening which preclude | |
756 | * normal IO. | |
757 | * We can only raise the barrier if there is no pending IO. | |
758 | * i.e. if nr_pending == 0. | |
759 | * We choose only to raise the barrier if no-one is waiting for the | |
760 | * barrier to go down. This means that as soon as an IO request | |
761 | * is ready, no other operations which require a barrier will start | |
762 | * until the IO request has had a chance. | |
763 | * | |
764 | * So: regular IO calls 'wait_barrier'. When that returns there | |
765 | * is no backgroup IO happening, It must arrange to call | |
766 | * allow_barrier when it has finished its IO. | |
767 | * backgroup IO calls must call raise_barrier. Once that returns | |
768 | * there is no normal IO happeing. It must arrange to call | |
769 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
770 | */ |
771 | #define RESYNC_DEPTH 32 | |
772 | ||
e8096360 | 773 | static void raise_barrier(struct r1conf *conf) |
1da177e4 LT |
774 | { |
775 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
776 | |
777 | /* Wait until no block IO is waiting */ | |
778 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 779 | conf->resync_lock, ); |
17999be4 N |
780 | |
781 | /* block any new IO from starting */ | |
782 | conf->barrier++; | |
783 | ||
046abeed | 784 | /* Now wait for all pending IO to complete */ |
17999be4 N |
785 | wait_event_lock_irq(conf->wait_barrier, |
786 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 787 | conf->resync_lock, ); |
17999be4 N |
788 | |
789 | spin_unlock_irq(&conf->resync_lock); | |
790 | } | |
791 | ||
e8096360 | 792 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
793 | { |
794 | unsigned long flags; | |
709ae487 | 795 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
796 | spin_lock_irqsave(&conf->resync_lock, flags); |
797 | conf->barrier--; | |
798 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
799 | wake_up(&conf->wait_barrier); | |
800 | } | |
801 | ||
e8096360 | 802 | static void wait_barrier(struct r1conf *conf) |
17999be4 N |
803 | { |
804 | spin_lock_irq(&conf->resync_lock); | |
805 | if (conf->barrier) { | |
806 | conf->nr_waiting++; | |
d6b42dcb N |
807 | /* Wait for the barrier to drop. |
808 | * However if there are already pending | |
809 | * requests (preventing the barrier from | |
810 | * rising completely), and the | |
811 | * pre-process bio queue isn't empty, | |
812 | * then don't wait, as we need to empty | |
813 | * that queue to get the nr_pending | |
814 | * count down. | |
815 | */ | |
816 | wait_event_lock_irq(conf->wait_barrier, | |
817 | !conf->barrier || | |
818 | (conf->nr_pending && | |
819 | current->bio_list && | |
820 | !bio_list_empty(current->bio_list)), | |
17999be4 | 821 | conf->resync_lock, |
d6b42dcb | 822 | ); |
17999be4 | 823 | conf->nr_waiting--; |
1da177e4 | 824 | } |
17999be4 | 825 | conf->nr_pending++; |
1da177e4 LT |
826 | spin_unlock_irq(&conf->resync_lock); |
827 | } | |
828 | ||
e8096360 | 829 | static void allow_barrier(struct r1conf *conf) |
17999be4 N |
830 | { |
831 | unsigned long flags; | |
832 | spin_lock_irqsave(&conf->resync_lock, flags); | |
833 | conf->nr_pending--; | |
834 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
835 | wake_up(&conf->wait_barrier); | |
836 | } | |
837 | ||
e8096360 | 838 | static void freeze_array(struct r1conf *conf) |
ddaf22ab N |
839 | { |
840 | /* stop syncio and normal IO and wait for everything to | |
841 | * go quite. | |
842 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
843 | * wait until nr_pending match nr_queued+1 |
844 | * This is called in the context of one normal IO request | |
845 | * that has failed. Thus any sync request that might be pending | |
846 | * will be blocked by nr_pending, and we need to wait for | |
847 | * pending IO requests to complete or be queued for re-try. | |
848 | * Thus the number queued (nr_queued) plus this request (1) | |
849 | * must match the number of pending IOs (nr_pending) before | |
850 | * we continue. | |
ddaf22ab N |
851 | */ |
852 | spin_lock_irq(&conf->resync_lock); | |
853 | conf->barrier++; | |
854 | conf->nr_waiting++; | |
855 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 856 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 857 | conf->resync_lock, |
c3b328ac | 858 | flush_pending_writes(conf)); |
ddaf22ab N |
859 | spin_unlock_irq(&conf->resync_lock); |
860 | } | |
e8096360 | 861 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
862 | { |
863 | /* reverse the effect of the freeze */ | |
864 | spin_lock_irq(&conf->resync_lock); | |
865 | conf->barrier--; | |
866 | conf->nr_waiting--; | |
867 | wake_up(&conf->wait_barrier); | |
868 | spin_unlock_irq(&conf->resync_lock); | |
869 | } | |
870 | ||
17999be4 | 871 | |
4e78064f | 872 | /* duplicate the data pages for behind I/O |
4e78064f | 873 | */ |
9f2c9d12 | 874 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
875 | { |
876 | int i; | |
877 | struct bio_vec *bvec; | |
2ca68f5e | 878 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 879 | GFP_NOIO); |
2ca68f5e | 880 | if (unlikely(!bvecs)) |
af6d7b76 | 881 | return; |
4b6d287f | 882 | |
4b6d287f | 883 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
884 | bvecs[i] = *bvec; |
885 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
886 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 887 | goto do_sync_io; |
2ca68f5e N |
888 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
889 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
890 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
891 | kunmap(bvec->bv_page); |
892 | } | |
2ca68f5e | 893 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
894 | r1_bio->behind_page_count = bio->bi_vcnt; |
895 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
896 | return; | |
4b6d287f N |
897 | |
898 | do_sync_io: | |
af6d7b76 | 899 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
900 | if (bvecs[i].bv_page) |
901 | put_page(bvecs[i].bv_page); | |
902 | kfree(bvecs); | |
36a4e1fe | 903 | pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
904 | } |
905 | ||
b4fdcb02 | 906 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 907 | { |
e8096360 | 908 | struct r1conf *conf = mddev->private; |
0eaf822c | 909 | struct raid1_info *mirror; |
9f2c9d12 | 910 | struct r1bio *r1_bio; |
1da177e4 | 911 | struct bio *read_bio; |
1f68f0c4 | 912 | int i, disks; |
84255d10 | 913 | struct bitmap *bitmap; |
191ea9b2 | 914 | unsigned long flags; |
a362357b | 915 | const int rw = bio_data_dir(bio); |
2c7d46ec | 916 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 917 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
3cb03002 | 918 | struct md_rdev *blocked_rdev; |
1f68f0c4 N |
919 | int first_clone; |
920 | int sectors_handled; | |
921 | int max_sectors; | |
191ea9b2 | 922 | |
1da177e4 LT |
923 | /* |
924 | * Register the new request and wait if the reconstruction | |
925 | * thread has put up a bar for new requests. | |
926 | * Continue immediately if no resync is active currently. | |
927 | */ | |
62de608d | 928 | |
3d310eb7 N |
929 | md_write_start(mddev, bio); /* wait on superblock update early */ |
930 | ||
6eef4b21 N |
931 | if (bio_data_dir(bio) == WRITE && |
932 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
933 | bio->bi_sector < mddev->suspend_hi) { | |
934 | /* As the suspend_* range is controlled by | |
935 | * userspace, we want an interruptible | |
936 | * wait. | |
937 | */ | |
938 | DEFINE_WAIT(w); | |
939 | for (;;) { | |
940 | flush_signals(current); | |
941 | prepare_to_wait(&conf->wait_barrier, | |
942 | &w, TASK_INTERRUPTIBLE); | |
943 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
944 | bio->bi_sector >= mddev->suspend_hi) | |
945 | break; | |
946 | schedule(); | |
947 | } | |
948 | finish_wait(&conf->wait_barrier, &w); | |
949 | } | |
62de608d | 950 | |
17999be4 | 951 | wait_barrier(conf); |
1da177e4 | 952 | |
84255d10 N |
953 | bitmap = mddev->bitmap; |
954 | ||
1da177e4 LT |
955 | /* |
956 | * make_request() can abort the operation when READA is being | |
957 | * used and no empty request is available. | |
958 | * | |
959 | */ | |
960 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
961 | ||
962 | r1_bio->master_bio = bio; | |
963 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 964 | r1_bio->state = 0; |
1da177e4 LT |
965 | r1_bio->mddev = mddev; |
966 | r1_bio->sector = bio->bi_sector; | |
967 | ||
d2eb35ac N |
968 | /* We might need to issue multiple reads to different |
969 | * devices if there are bad blocks around, so we keep | |
970 | * track of the number of reads in bio->bi_phys_segments. | |
971 | * If this is 0, there is only one r1_bio and no locking | |
972 | * will be needed when requests complete. If it is | |
973 | * non-zero, then it is the number of not-completed requests. | |
974 | */ | |
975 | bio->bi_phys_segments = 0; | |
976 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
977 | ||
a362357b | 978 | if (rw == READ) { |
1da177e4 LT |
979 | /* |
980 | * read balancing logic: | |
981 | */ | |
d2eb35ac N |
982 | int rdisk; |
983 | ||
984 | read_again: | |
985 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
986 | |
987 | if (rdisk < 0) { | |
988 | /* couldn't find anywhere to read from */ | |
989 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 990 | return; |
1da177e4 LT |
991 | } |
992 | mirror = conf->mirrors + rdisk; | |
993 | ||
e555190d N |
994 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
995 | bitmap) { | |
996 | /* Reading from a write-mostly device must | |
997 | * take care not to over-take any writes | |
998 | * that are 'behind' | |
999 | */ | |
1000 | wait_event(bitmap->behind_wait, | |
1001 | atomic_read(&bitmap->behind_writes) == 0); | |
1002 | } | |
1da177e4 LT |
1003 | r1_bio->read_disk = rdisk; |
1004 | ||
a167f663 | 1005 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
1006 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
1007 | max_sectors); | |
1da177e4 LT |
1008 | |
1009 | r1_bio->bios[rdisk] = read_bio; | |
1010 | ||
1011 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
1012 | read_bio->bi_bdev = mirror->rdev->bdev; | |
1013 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1014 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1015 | read_bio->bi_private = r1_bio; |
1016 | ||
d2eb35ac N |
1017 | if (max_sectors < r1_bio->sectors) { |
1018 | /* could not read all from this device, so we will | |
1019 | * need another r1_bio. | |
1020 | */ | |
d2eb35ac N |
1021 | |
1022 | sectors_handled = (r1_bio->sector + max_sectors | |
1023 | - bio->bi_sector); | |
1024 | r1_bio->sectors = max_sectors; | |
1025 | spin_lock_irq(&conf->device_lock); | |
1026 | if (bio->bi_phys_segments == 0) | |
1027 | bio->bi_phys_segments = 2; | |
1028 | else | |
1029 | bio->bi_phys_segments++; | |
1030 | spin_unlock_irq(&conf->device_lock); | |
1031 | /* Cannot call generic_make_request directly | |
1032 | * as that will be queued in __make_request | |
1033 | * and subsequent mempool_alloc might block waiting | |
1034 | * for it. So hand bio over to raid1d. | |
1035 | */ | |
1036 | reschedule_retry(r1_bio); | |
1037 | ||
1038 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1039 | ||
1040 | r1_bio->master_bio = bio; | |
1041 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1042 | r1_bio->state = 0; | |
1043 | r1_bio->mddev = mddev; | |
1044 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1045 | goto read_again; | |
1046 | } else | |
1047 | generic_make_request(read_bio); | |
5a7bbad2 | 1048 | return; |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | /* | |
1052 | * WRITE: | |
1053 | */ | |
34db0cd6 N |
1054 | if (conf->pending_count >= max_queued_requests) { |
1055 | md_wakeup_thread(mddev->thread); | |
1056 | wait_event(conf->wait_barrier, | |
1057 | conf->pending_count < max_queued_requests); | |
1058 | } | |
1f68f0c4 | 1059 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1060 | * inc refcount on their rdev. Record them by setting |
1061 | * bios[x] to bio | |
1f68f0c4 N |
1062 | * If there are known/acknowledged bad blocks on any device on |
1063 | * which we have seen a write error, we want to avoid writing those | |
1064 | * blocks. | |
1065 | * This potentially requires several writes to write around | |
1066 | * the bad blocks. Each set of writes gets it's own r1bio | |
1067 | * with a set of bios attached. | |
1da177e4 | 1068 | */ |
c3b328ac | 1069 | |
8f19ccb2 | 1070 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1071 | retry_write: |
1072 | blocked_rdev = NULL; | |
1da177e4 | 1073 | rcu_read_lock(); |
1f68f0c4 | 1074 | max_sectors = r1_bio->sectors; |
1da177e4 | 1075 | for (i = 0; i < disks; i++) { |
3cb03002 | 1076 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1077 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1078 | atomic_inc(&rdev->nr_pending); | |
1079 | blocked_rdev = rdev; | |
1080 | break; | |
1081 | } | |
1f68f0c4 | 1082 | r1_bio->bios[i] = NULL; |
6b740b8d N |
1083 | if (!rdev || test_bit(Faulty, &rdev->flags) |
1084 | || test_bit(Unmerged, &rdev->flags)) { | |
8f19ccb2 N |
1085 | if (i < conf->raid_disks) |
1086 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1087 | continue; |
1088 | } | |
1089 | ||
1090 | atomic_inc(&rdev->nr_pending); | |
1091 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1092 | sector_t first_bad; | |
1093 | int bad_sectors; | |
1094 | int is_bad; | |
1095 | ||
1096 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1097 | max_sectors, | |
1098 | &first_bad, &bad_sectors); | |
1099 | if (is_bad < 0) { | |
1100 | /* mustn't write here until the bad block is | |
1101 | * acknowledged*/ | |
1102 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1103 | blocked_rdev = rdev; | |
1104 | break; | |
1105 | } | |
1106 | if (is_bad && first_bad <= r1_bio->sector) { | |
1107 | /* Cannot write here at all */ | |
1108 | bad_sectors -= (r1_bio->sector - first_bad); | |
1109 | if (bad_sectors < max_sectors) | |
1110 | /* mustn't write more than bad_sectors | |
1111 | * to other devices yet | |
1112 | */ | |
1113 | max_sectors = bad_sectors; | |
03c902e1 | 1114 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1115 | /* We don't set R1BIO_Degraded as that |
1116 | * only applies if the disk is | |
1117 | * missing, so it might be re-added, | |
1118 | * and we want to know to recover this | |
1119 | * chunk. | |
1120 | * In this case the device is here, | |
1121 | * and the fact that this chunk is not | |
1122 | * in-sync is recorded in the bad | |
1123 | * block log | |
1124 | */ | |
1125 | continue; | |
964147d5 | 1126 | } |
1f68f0c4 N |
1127 | if (is_bad) { |
1128 | int good_sectors = first_bad - r1_bio->sector; | |
1129 | if (good_sectors < max_sectors) | |
1130 | max_sectors = good_sectors; | |
1131 | } | |
1132 | } | |
1133 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1134 | } |
1135 | rcu_read_unlock(); | |
1136 | ||
6bfe0b49 DW |
1137 | if (unlikely(blocked_rdev)) { |
1138 | /* Wait for this device to become unblocked */ | |
1139 | int j; | |
1140 | ||
1141 | for (j = 0; j < i; j++) | |
1142 | if (r1_bio->bios[j]) | |
1143 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1144 | r1_bio->state = 0; |
6bfe0b49 DW |
1145 | allow_barrier(conf); |
1146 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1147 | wait_barrier(conf); | |
1148 | goto retry_write; | |
1149 | } | |
1150 | ||
1f68f0c4 N |
1151 | if (max_sectors < r1_bio->sectors) { |
1152 | /* We are splitting this write into multiple parts, so | |
1153 | * we need to prepare for allocating another r1_bio. | |
1154 | */ | |
1155 | r1_bio->sectors = max_sectors; | |
1156 | spin_lock_irq(&conf->device_lock); | |
1157 | if (bio->bi_phys_segments == 0) | |
1158 | bio->bi_phys_segments = 2; | |
1159 | else | |
1160 | bio->bi_phys_segments++; | |
1161 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1162 | } |
1f68f0c4 | 1163 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1164 | |
4e78064f | 1165 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1166 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1167 | |
1f68f0c4 | 1168 | first_clone = 1; |
1da177e4 LT |
1169 | for (i = 0; i < disks; i++) { |
1170 | struct bio *mbio; | |
1171 | if (!r1_bio->bios[i]) | |
1172 | continue; | |
1173 | ||
a167f663 | 1174 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1175 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1176 | ||
1177 | if (first_clone) { | |
1178 | /* do behind I/O ? | |
1179 | * Not if there are too many, or cannot | |
1180 | * allocate memory, or a reader on WriteMostly | |
1181 | * is waiting for behind writes to flush */ | |
1182 | if (bitmap && | |
1183 | (atomic_read(&bitmap->behind_writes) | |
1184 | < mddev->bitmap_info.max_write_behind) && | |
1185 | !waitqueue_active(&bitmap->behind_wait)) | |
1186 | alloc_behind_pages(mbio, r1_bio); | |
1187 | ||
1188 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1189 | r1_bio->sectors, | |
1190 | test_bit(R1BIO_BehindIO, | |
1191 | &r1_bio->state)); | |
1192 | first_clone = 0; | |
1193 | } | |
2ca68f5e | 1194 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1195 | struct bio_vec *bvec; |
1196 | int j; | |
1197 | ||
1198 | /* Yes, I really want the '__' version so that | |
1199 | * we clear any unused pointer in the io_vec, rather | |
1200 | * than leave them unchanged. This is important | |
1201 | * because when we come to free the pages, we won't | |
046abeed | 1202 | * know the original bi_idx, so we just free |
4b6d287f N |
1203 | * them all |
1204 | */ | |
1205 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1206 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1207 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1208 | atomic_inc(&r1_bio->behind_remaining); | |
1209 | } | |
1210 | ||
1f68f0c4 N |
1211 | r1_bio->bios[i] = mbio; |
1212 | ||
1213 | mbio->bi_sector = (r1_bio->sector + | |
1214 | conf->mirrors[i].rdev->data_offset); | |
1215 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1216 | mbio->bi_end_io = raid1_end_write_request; | |
1217 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; | |
1218 | mbio->bi_private = r1_bio; | |
1219 | ||
1da177e4 | 1220 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
1221 | spin_lock_irqsave(&conf->device_lock, flags); |
1222 | bio_list_add(&conf->pending_bio_list, mbio); | |
34db0cd6 | 1223 | conf->pending_count++; |
4e78064f | 1224 | spin_unlock_irqrestore(&conf->device_lock, flags); |
b357f04a N |
1225 | if (!mddev_check_plugged(mddev)) |
1226 | md_wakeup_thread(mddev->thread); | |
1da177e4 | 1227 | } |
079fa166 N |
1228 | /* Mustn't call r1_bio_write_done before this next test, |
1229 | * as it could result in the bio being freed. | |
1230 | */ | |
1f68f0c4 | 1231 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1232 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1233 | /* We need another r1_bio. It has already been counted |
1234 | * in bio->bi_phys_segments | |
1235 | */ | |
1236 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1237 | r1_bio->master_bio = bio; | |
1238 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1239 | r1_bio->state = 0; | |
1240 | r1_bio->mddev = mddev; | |
1241 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1242 | goto retry_write; | |
1243 | } | |
1244 | ||
079fa166 N |
1245 | r1_bio_write_done(r1_bio); |
1246 | ||
1247 | /* In case raid1d snuck in to freeze_array */ | |
1248 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1249 | } |
1250 | ||
fd01b88c | 1251 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1252 | { |
e8096360 | 1253 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1254 | int i; |
1255 | ||
1256 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1257 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1258 | rcu_read_lock(); |
1259 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1260 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1261 | seq_printf(seq, "%s", |
ddac7c7e N |
1262 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1263 | } | |
1264 | rcu_read_unlock(); | |
1da177e4 LT |
1265 | seq_printf(seq, "]"); |
1266 | } | |
1267 | ||
1268 | ||
fd01b88c | 1269 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1270 | { |
1271 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1272 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1273 | |
1274 | /* | |
1275 | * If it is not operational, then we have already marked it as dead | |
1276 | * else if it is the last working disks, ignore the error, let the | |
1277 | * next level up know. | |
1278 | * else mark the drive as failed | |
1279 | */ | |
b2d444d7 | 1280 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1281 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1282 | /* |
1283 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1284 | * normal single drive. |
1285 | * However don't try a recovery from this drive as | |
1286 | * it is very likely to fail. | |
1da177e4 | 1287 | */ |
5389042f | 1288 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1289 | return; |
4044ba58 | 1290 | } |
de393cde | 1291 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1292 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1293 | unsigned long flags; | |
1294 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1295 | mddev->degraded++; |
dd00a99e | 1296 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1297 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1298 | /* |
1299 | * if recovery is running, make sure it aborts. | |
1300 | */ | |
dfc70645 | 1301 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1302 | } else |
1303 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1304 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1305 | printk(KERN_ALERT |
1306 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1307 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1308 | mdname(mddev), bdevname(rdev->bdev, b), |
1309 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1310 | } |
1311 | ||
e8096360 | 1312 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1313 | { |
1314 | int i; | |
1da177e4 | 1315 | |
9dd1e2fa | 1316 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1317 | if (!conf) { |
9dd1e2fa | 1318 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1319 | return; |
1320 | } | |
9dd1e2fa | 1321 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1322 | conf->raid_disks); |
1323 | ||
ddac7c7e | 1324 | rcu_read_lock(); |
1da177e4 LT |
1325 | for (i = 0; i < conf->raid_disks; i++) { |
1326 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1327 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1328 | if (rdev) |
9dd1e2fa | 1329 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1330 | i, !test_bit(In_sync, &rdev->flags), |
1331 | !test_bit(Faulty, &rdev->flags), | |
1332 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1333 | } |
ddac7c7e | 1334 | rcu_read_unlock(); |
1da177e4 LT |
1335 | } |
1336 | ||
e8096360 | 1337 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1338 | { |
17999be4 N |
1339 | wait_barrier(conf); |
1340 | allow_barrier(conf); | |
1da177e4 LT |
1341 | |
1342 | mempool_destroy(conf->r1buf_pool); | |
1343 | conf->r1buf_pool = NULL; | |
1344 | } | |
1345 | ||
fd01b88c | 1346 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1347 | { |
1348 | int i; | |
e8096360 | 1349 | struct r1conf *conf = mddev->private; |
6b965620 N |
1350 | int count = 0; |
1351 | unsigned long flags; | |
1da177e4 LT |
1352 | |
1353 | /* | |
1354 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1355 | * and mark them readable. |
1356 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1357 | */ |
1358 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1359 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1360 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1361 | if (repl | |
1362 | && repl->recovery_offset == MaxSector | |
1363 | && !test_bit(Faulty, &repl->flags) | |
1364 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1365 | /* replacement has just become active */ | |
1366 | if (!rdev || | |
1367 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1368 | count++; | |
1369 | if (rdev) { | |
1370 | /* Replaced device not technically | |
1371 | * faulty, but we need to be sure | |
1372 | * it gets removed and never re-added | |
1373 | */ | |
1374 | set_bit(Faulty, &rdev->flags); | |
1375 | sysfs_notify_dirent_safe( | |
1376 | rdev->sysfs_state); | |
1377 | } | |
1378 | } | |
ddac7c7e N |
1379 | if (rdev |
1380 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1381 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1382 | count++; |
654e8b5a | 1383 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1384 | } |
1385 | } | |
6b965620 N |
1386 | spin_lock_irqsave(&conf->device_lock, flags); |
1387 | mddev->degraded -= count; | |
1388 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1389 | |
1390 | print_conf(conf); | |
6b965620 | 1391 | return count; |
1da177e4 LT |
1392 | } |
1393 | ||
1394 | ||
fd01b88c | 1395 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1396 | { |
e8096360 | 1397 | struct r1conf *conf = mddev->private; |
199050ea | 1398 | int err = -EEXIST; |
41158c7e | 1399 | int mirror = 0; |
0eaf822c | 1400 | struct raid1_info *p; |
6c2fce2e | 1401 | int first = 0; |
30194636 | 1402 | int last = conf->raid_disks - 1; |
6b740b8d | 1403 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
1da177e4 | 1404 | |
5389042f N |
1405 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1406 | return -EBUSY; | |
1407 | ||
6c2fce2e NB |
1408 | if (rdev->raid_disk >= 0) |
1409 | first = last = rdev->raid_disk; | |
1410 | ||
6b740b8d N |
1411 | if (q->merge_bvec_fn) { |
1412 | set_bit(Unmerged, &rdev->flags); | |
1413 | mddev->merge_check_needed = 1; | |
1414 | } | |
1415 | ||
7ef449d1 N |
1416 | for (mirror = first; mirror <= last; mirror++) { |
1417 | p = conf->mirrors+mirror; | |
1418 | if (!p->rdev) { | |
1da177e4 | 1419 | |
8f6c2e4b MP |
1420 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1421 | rdev->data_offset << 9); | |
1da177e4 LT |
1422 | |
1423 | p->head_position = 0; | |
1424 | rdev->raid_disk = mirror; | |
199050ea | 1425 | err = 0; |
6aea114a N |
1426 | /* As all devices are equivalent, we don't need a full recovery |
1427 | * if this was recently any drive of the array | |
1428 | */ | |
1429 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1430 | conf->fullsync = 1; |
d6065f7b | 1431 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1432 | break; |
1433 | } | |
7ef449d1 N |
1434 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1435 | p[conf->raid_disks].rdev == NULL) { | |
1436 | /* Add this device as a replacement */ | |
1437 | clear_bit(In_sync, &rdev->flags); | |
1438 | set_bit(Replacement, &rdev->flags); | |
1439 | rdev->raid_disk = mirror; | |
1440 | err = 0; | |
1441 | conf->fullsync = 1; | |
1442 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1443 | break; | |
1444 | } | |
1445 | } | |
6b740b8d N |
1446 | if (err == 0 && test_bit(Unmerged, &rdev->flags)) { |
1447 | /* Some requests might not have seen this new | |
1448 | * merge_bvec_fn. We must wait for them to complete | |
1449 | * before merging the device fully. | |
1450 | * First we make sure any code which has tested | |
1451 | * our function has submitted the request, then | |
1452 | * we wait for all outstanding requests to complete. | |
1453 | */ | |
1454 | synchronize_sched(); | |
1455 | raise_barrier(conf); | |
1456 | lower_barrier(conf); | |
1457 | clear_bit(Unmerged, &rdev->flags); | |
1458 | } | |
ac5e7113 | 1459 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1460 | print_conf(conf); |
199050ea | 1461 | return err; |
1da177e4 LT |
1462 | } |
1463 | ||
b8321b68 | 1464 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1465 | { |
e8096360 | 1466 | struct r1conf *conf = mddev->private; |
1da177e4 | 1467 | int err = 0; |
b8321b68 | 1468 | int number = rdev->raid_disk; |
0eaf822c | 1469 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1470 | |
b014f14c N |
1471 | if (rdev != p->rdev) |
1472 | p = conf->mirrors + conf->raid_disks + number; | |
1473 | ||
1da177e4 | 1474 | print_conf(conf); |
b8321b68 | 1475 | if (rdev == p->rdev) { |
b2d444d7 | 1476 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1477 | atomic_read(&rdev->nr_pending)) { |
1478 | err = -EBUSY; | |
1479 | goto abort; | |
1480 | } | |
046abeed | 1481 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1482 | * is not possible. |
1483 | */ | |
1484 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1485 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1486 | mddev->degraded < conf->raid_disks) { |
1487 | err = -EBUSY; | |
1488 | goto abort; | |
1489 | } | |
1da177e4 | 1490 | p->rdev = NULL; |
fbd568a3 | 1491 | synchronize_rcu(); |
1da177e4 LT |
1492 | if (atomic_read(&rdev->nr_pending)) { |
1493 | /* lost the race, try later */ | |
1494 | err = -EBUSY; | |
1495 | p->rdev = rdev; | |
ac5e7113 | 1496 | goto abort; |
8c7a2c2b N |
1497 | } else if (conf->mirrors[conf->raid_disks + number].rdev) { |
1498 | /* We just removed a device that is being replaced. | |
1499 | * Move down the replacement. We drain all IO before | |
1500 | * doing this to avoid confusion. | |
1501 | */ | |
1502 | struct md_rdev *repl = | |
1503 | conf->mirrors[conf->raid_disks + number].rdev; | |
1504 | raise_barrier(conf); | |
1505 | clear_bit(Replacement, &repl->flags); | |
1506 | p->rdev = repl; | |
1507 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
1508 | lower_barrier(conf); | |
1509 | clear_bit(WantReplacement, &rdev->flags); | |
1510 | } else | |
b014f14c | 1511 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1512 | err = md_integrity_register(mddev); |
1da177e4 LT |
1513 | } |
1514 | abort: | |
1515 | ||
1516 | print_conf(conf); | |
1517 | return err; | |
1518 | } | |
1519 | ||
1520 | ||
6712ecf8 | 1521 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1522 | { |
9f2c9d12 | 1523 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1524 | |
0fc280f6 | 1525 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1526 | |
1da177e4 LT |
1527 | /* |
1528 | * we have read a block, now it needs to be re-written, | |
1529 | * or re-read if the read failed. | |
1530 | * We don't do much here, just schedule handling by raid1d | |
1531 | */ | |
69382e85 | 1532 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1533 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1534 | |
1535 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1536 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1537 | } |
1538 | ||
6712ecf8 | 1539 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1540 | { |
1541 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1542 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1543 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1544 | struct r1conf *conf = mddev->private; |
1da177e4 | 1545 | int mirror=0; |
4367af55 N |
1546 | sector_t first_bad; |
1547 | int bad_sectors; | |
1da177e4 | 1548 | |
ba3ae3be NK |
1549 | mirror = find_bio_disk(r1_bio, bio); |
1550 | ||
6b1117d5 | 1551 | if (!uptodate) { |
57dab0bd | 1552 | sector_t sync_blocks = 0; |
6b1117d5 N |
1553 | sector_t s = r1_bio->sector; |
1554 | long sectors_to_go = r1_bio->sectors; | |
1555 | /* make sure these bits doesn't get cleared. */ | |
1556 | do { | |
5e3db645 | 1557 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1558 | &sync_blocks, 1); |
1559 | s += sync_blocks; | |
1560 | sectors_to_go -= sync_blocks; | |
1561 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1562 | set_bit(WriteErrorSeen, |
1563 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
1564 | if (!test_and_set_bit(WantReplacement, |
1565 | &conf->mirrors[mirror].rdev->flags)) | |
1566 | set_bit(MD_RECOVERY_NEEDED, & | |
1567 | mddev->recovery); | |
d8f05d29 | 1568 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 N |
1569 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1570 | r1_bio->sector, | |
1571 | r1_bio->sectors, | |
3a9f28a5 N |
1572 | &first_bad, &bad_sectors) && |
1573 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1574 | r1_bio->sector, | |
1575 | r1_bio->sectors, | |
1576 | &first_bad, &bad_sectors) | |
1577 | ) | |
4367af55 | 1578 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1579 | |
1da177e4 | 1580 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1581 | int s = r1_bio->sectors; |
d8f05d29 N |
1582 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1583 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1584 | reschedule_retry(r1_bio); |
1585 | else { | |
1586 | put_buf(r1_bio); | |
1587 | md_done_sync(mddev, s, uptodate); | |
1588 | } | |
1da177e4 | 1589 | } |
1da177e4 LT |
1590 | } |
1591 | ||
3cb03002 | 1592 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1593 | int sectors, struct page *page, int rw) |
1594 | { | |
1595 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1596 | /* success */ | |
1597 | return 1; | |
19d67169 | 1598 | if (rw == WRITE) { |
d8f05d29 | 1599 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1600 | if (!test_and_set_bit(WantReplacement, |
1601 | &rdev->flags)) | |
1602 | set_bit(MD_RECOVERY_NEEDED, & | |
1603 | rdev->mddev->recovery); | |
1604 | } | |
d8f05d29 N |
1605 | /* need to record an error - either for the block or the device */ |
1606 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1607 | md_error(rdev->mddev, rdev); | |
1608 | return 0; | |
1609 | } | |
1610 | ||
9f2c9d12 | 1611 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1612 | { |
a68e5870 N |
1613 | /* Try some synchronous reads of other devices to get |
1614 | * good data, much like with normal read errors. Only | |
1615 | * read into the pages we already have so we don't | |
1616 | * need to re-issue the read request. | |
1617 | * We don't need to freeze the array, because being in an | |
1618 | * active sync request, there is no normal IO, and | |
1619 | * no overlapping syncs. | |
06f60385 N |
1620 | * We don't need to check is_badblock() again as we |
1621 | * made sure that anything with a bad block in range | |
1622 | * will have bi_end_io clear. | |
a68e5870 | 1623 | */ |
fd01b88c | 1624 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1625 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1626 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1627 | sector_t sect = r1_bio->sector; | |
1628 | int sectors = r1_bio->sectors; | |
1629 | int idx = 0; | |
1630 | ||
1631 | while(sectors) { | |
1632 | int s = sectors; | |
1633 | int d = r1_bio->read_disk; | |
1634 | int success = 0; | |
3cb03002 | 1635 | struct md_rdev *rdev; |
78d7f5f7 | 1636 | int start; |
a68e5870 N |
1637 | |
1638 | if (s > (PAGE_SIZE>>9)) | |
1639 | s = PAGE_SIZE >> 9; | |
1640 | do { | |
1641 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1642 | /* No rcu protection needed here devices | |
1643 | * can only be removed when no resync is | |
1644 | * active, and resync is currently active | |
1645 | */ | |
1646 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1647 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1648 | bio->bi_io_vec[idx].bv_page, |
1649 | READ, false)) { | |
1650 | success = 1; | |
1651 | break; | |
1652 | } | |
1653 | } | |
1654 | d++; | |
8f19ccb2 | 1655 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1656 | d = 0; |
1657 | } while (!success && d != r1_bio->read_disk); | |
1658 | ||
78d7f5f7 | 1659 | if (!success) { |
a68e5870 | 1660 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1661 | int abort = 0; |
1662 | /* Cannot read from anywhere, this block is lost. | |
1663 | * Record a bad block on each device. If that doesn't | |
1664 | * work just disable and interrupt the recovery. | |
1665 | * Don't fail devices as that won't really help. | |
1666 | */ | |
a68e5870 N |
1667 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1668 | " for block %llu\n", | |
1669 | mdname(mddev), | |
1670 | bdevname(bio->bi_bdev, b), | |
1671 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 1672 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1673 | rdev = conf->mirrors[d].rdev; |
1674 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1675 | continue; | |
1676 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1677 | abort = 1; | |
1678 | } | |
1679 | if (abort) { | |
d890fa2b N |
1680 | conf->recovery_disabled = |
1681 | mddev->recovery_disabled; | |
3a9f28a5 N |
1682 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1683 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1684 | put_buf(r1_bio); | |
1685 | return 0; | |
1686 | } | |
1687 | /* Try next page */ | |
1688 | sectors -= s; | |
1689 | sect += s; | |
1690 | idx++; | |
1691 | continue; | |
d11c171e | 1692 | } |
78d7f5f7 N |
1693 | |
1694 | start = d; | |
1695 | /* write it back and re-read */ | |
1696 | while (d != r1_bio->read_disk) { | |
1697 | if (d == 0) | |
8f19ccb2 | 1698 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1699 | d--; |
1700 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1701 | continue; | |
1702 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1703 | if (r1_sync_page_io(rdev, sect, s, |
1704 | bio->bi_io_vec[idx].bv_page, | |
1705 | WRITE) == 0) { | |
78d7f5f7 N |
1706 | r1_bio->bios[d]->bi_end_io = NULL; |
1707 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1708 | } |
78d7f5f7 N |
1709 | } |
1710 | d = start; | |
1711 | while (d != r1_bio->read_disk) { | |
1712 | if (d == 0) | |
8f19ccb2 | 1713 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1714 | d--; |
1715 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1716 | continue; | |
1717 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1718 | if (r1_sync_page_io(rdev, sect, s, |
1719 | bio->bi_io_vec[idx].bv_page, | |
1720 | READ) != 0) | |
9d3d8011 | 1721 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1722 | } |
a68e5870 N |
1723 | sectors -= s; |
1724 | sect += s; | |
1725 | idx ++; | |
1726 | } | |
78d7f5f7 | 1727 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1728 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1729 | return 1; |
1730 | } | |
1731 | ||
9f2c9d12 | 1732 | static int process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1733 | { |
1734 | /* We have read all readable devices. If we haven't | |
1735 | * got the block, then there is no hope left. | |
1736 | * If we have, then we want to do a comparison | |
1737 | * and skip the write if everything is the same. | |
1738 | * If any blocks failed to read, then we need to | |
1739 | * attempt an over-write | |
1740 | */ | |
fd01b88c | 1741 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1742 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1743 | int primary; |
1744 | int i; | |
f4380a91 | 1745 | int vcnt; |
a68e5870 | 1746 | |
8f19ccb2 | 1747 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 N |
1748 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1749 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1750 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1751 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1752 | break; | |
1753 | } | |
1754 | r1_bio->read_disk = primary; | |
f4380a91 | 1755 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); |
8f19ccb2 | 1756 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 1757 | int j; |
78d7f5f7 N |
1758 | struct bio *pbio = r1_bio->bios[primary]; |
1759 | struct bio *sbio = r1_bio->bios[i]; | |
1760 | int size; | |
a68e5870 | 1761 | |
78d7f5f7 N |
1762 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1763 | continue; | |
1764 | ||
1765 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1766 | for (j = vcnt; j-- ; ) { | |
1767 | struct page *p, *s; | |
1768 | p = pbio->bi_io_vec[j].bv_page; | |
1769 | s = sbio->bi_io_vec[j].bv_page; | |
1770 | if (memcmp(page_address(p), | |
1771 | page_address(s), | |
5020ad7d | 1772 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 1773 | break; |
69382e85 | 1774 | } |
78d7f5f7 N |
1775 | } else |
1776 | j = 0; | |
1777 | if (j >= 0) | |
1778 | mddev->resync_mismatches += r1_bio->sectors; | |
1779 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1780 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1781 | /* No need to write to this device. */ | |
1782 | sbio->bi_end_io = NULL; | |
1783 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1784 | continue; | |
1785 | } | |
1786 | /* fixup the bio for reuse */ | |
1787 | sbio->bi_vcnt = vcnt; | |
1788 | sbio->bi_size = r1_bio->sectors << 9; | |
1789 | sbio->bi_idx = 0; | |
1790 | sbio->bi_phys_segments = 0; | |
1791 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1792 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1793 | sbio->bi_next = NULL; | |
1794 | sbio->bi_sector = r1_bio->sector + | |
1795 | conf->mirrors[i].rdev->data_offset; | |
1796 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1797 | size = sbio->bi_size; | |
1798 | for (j = 0; j < vcnt ; j++) { | |
1799 | struct bio_vec *bi; | |
1800 | bi = &sbio->bi_io_vec[j]; | |
1801 | bi->bv_offset = 0; | |
1802 | if (size > PAGE_SIZE) | |
1803 | bi->bv_len = PAGE_SIZE; | |
1804 | else | |
1805 | bi->bv_len = size; | |
1806 | size -= PAGE_SIZE; | |
1807 | memcpy(page_address(bi->bv_page), | |
1808 | page_address(pbio->bi_io_vec[j].bv_page), | |
1809 | PAGE_SIZE); | |
69382e85 | 1810 | } |
78d7f5f7 | 1811 | } |
a68e5870 N |
1812 | return 0; |
1813 | } | |
1814 | ||
9f2c9d12 | 1815 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 1816 | { |
e8096360 | 1817 | struct r1conf *conf = mddev->private; |
a68e5870 | 1818 | int i; |
8f19ccb2 | 1819 | int disks = conf->raid_disks * 2; |
a68e5870 N |
1820 | struct bio *bio, *wbio; |
1821 | ||
1822 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1823 | ||
a68e5870 N |
1824 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1825 | /* ouch - failed to read all of that. */ | |
1826 | if (!fix_sync_read_error(r1_bio)) | |
1827 | return; | |
7ca78d57 N |
1828 | |
1829 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1830 | if (process_checks(r1_bio) < 0) | |
1831 | return; | |
d11c171e N |
1832 | /* |
1833 | * schedule writes | |
1834 | */ | |
1da177e4 LT |
1835 | atomic_set(&r1_bio->remaining, 1); |
1836 | for (i = 0; i < disks ; i++) { | |
1837 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1838 | if (wbio->bi_end_io == NULL || |
1839 | (wbio->bi_end_io == end_sync_read && | |
1840 | (i == r1_bio->read_disk || | |
1841 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1842 | continue; |
1843 | ||
3e198f78 N |
1844 | wbio->bi_rw = WRITE; |
1845 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1846 | atomic_inc(&r1_bio->remaining); |
1847 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1848 | |
1da177e4 LT |
1849 | generic_make_request(wbio); |
1850 | } | |
1851 | ||
1852 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1853 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
1854 | int s = r1_bio->sectors; |
1855 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
1856 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1857 | reschedule_retry(r1_bio); | |
1858 | else { | |
1859 | put_buf(r1_bio); | |
1860 | md_done_sync(mddev, s, 1); | |
1861 | } | |
1da177e4 LT |
1862 | } |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * This is a kernel thread which: | |
1867 | * | |
1868 | * 1. Retries failed read operations on working mirrors. | |
1869 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1870 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1871 | */ |
1872 | ||
e8096360 | 1873 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
1874 | sector_t sect, int sectors) |
1875 | { | |
fd01b88c | 1876 | struct mddev *mddev = conf->mddev; |
867868fb N |
1877 | while(sectors) { |
1878 | int s = sectors; | |
1879 | int d = read_disk; | |
1880 | int success = 0; | |
1881 | int start; | |
3cb03002 | 1882 | struct md_rdev *rdev; |
867868fb N |
1883 | |
1884 | if (s > (PAGE_SIZE>>9)) | |
1885 | s = PAGE_SIZE >> 9; | |
1886 | ||
1887 | do { | |
1888 | /* Note: no rcu protection needed here | |
1889 | * as this is synchronous in the raid1d thread | |
1890 | * which is the thread that might remove | |
1891 | * a device. If raid1d ever becomes multi-threaded.... | |
1892 | */ | |
d2eb35ac N |
1893 | sector_t first_bad; |
1894 | int bad_sectors; | |
1895 | ||
867868fb N |
1896 | rdev = conf->mirrors[d].rdev; |
1897 | if (rdev && | |
da8840a7 | 1898 | (test_bit(In_sync, &rdev->flags) || |
1899 | (!test_bit(Faulty, &rdev->flags) && | |
1900 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac N |
1901 | is_badblock(rdev, sect, s, |
1902 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
1903 | sync_page_io(rdev, sect, s<<9, |
1904 | conf->tmppage, READ, false)) | |
867868fb N |
1905 | success = 1; |
1906 | else { | |
1907 | d++; | |
8f19ccb2 | 1908 | if (d == conf->raid_disks * 2) |
867868fb N |
1909 | d = 0; |
1910 | } | |
1911 | } while (!success && d != read_disk); | |
1912 | ||
1913 | if (!success) { | |
d8f05d29 | 1914 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 1915 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
1916 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
1917 | md_error(mddev, rdev); | |
867868fb N |
1918 | break; |
1919 | } | |
1920 | /* write it back and re-read */ | |
1921 | start = d; | |
1922 | while (d != read_disk) { | |
1923 | if (d==0) | |
8f19ccb2 | 1924 | d = conf->raid_disks * 2; |
867868fb N |
1925 | d--; |
1926 | rdev = conf->mirrors[d].rdev; | |
1927 | if (rdev && | |
d8f05d29 N |
1928 | test_bit(In_sync, &rdev->flags)) |
1929 | r1_sync_page_io(rdev, sect, s, | |
1930 | conf->tmppage, WRITE); | |
867868fb N |
1931 | } |
1932 | d = start; | |
1933 | while (d != read_disk) { | |
1934 | char b[BDEVNAME_SIZE]; | |
1935 | if (d==0) | |
8f19ccb2 | 1936 | d = conf->raid_disks * 2; |
867868fb N |
1937 | d--; |
1938 | rdev = conf->mirrors[d].rdev; | |
1939 | if (rdev && | |
1940 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
1941 | if (r1_sync_page_io(rdev, sect, s, |
1942 | conf->tmppage, READ)) { | |
867868fb N |
1943 | atomic_add(s, &rdev->corrected_errors); |
1944 | printk(KERN_INFO | |
9dd1e2fa | 1945 | "md/raid1:%s: read error corrected " |
867868fb N |
1946 | "(%d sectors at %llu on %s)\n", |
1947 | mdname(mddev), s, | |
969b755a RD |
1948 | (unsigned long long)(sect + |
1949 | rdev->data_offset), | |
867868fb N |
1950 | bdevname(rdev->bdev, b)); |
1951 | } | |
1952 | } | |
1953 | } | |
1954 | sectors -= s; | |
1955 | sect += s; | |
1956 | } | |
1957 | } | |
1958 | ||
cd5ff9a1 N |
1959 | static void bi_complete(struct bio *bio, int error) |
1960 | { | |
1961 | complete((struct completion *)bio->bi_private); | |
1962 | } | |
1963 | ||
1964 | static int submit_bio_wait(int rw, struct bio *bio) | |
1965 | { | |
1966 | struct completion event; | |
1967 | rw |= REQ_SYNC; | |
1968 | ||
1969 | init_completion(&event); | |
1970 | bio->bi_private = &event; | |
1971 | bio->bi_end_io = bi_complete; | |
1972 | submit_bio(rw, bio); | |
1973 | wait_for_completion(&event); | |
1974 | ||
1975 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1976 | } | |
1977 | ||
9f2c9d12 | 1978 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 1979 | { |
fd01b88c | 1980 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1981 | struct r1conf *conf = mddev->private; |
3cb03002 | 1982 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
1983 | int vcnt, idx; |
1984 | struct bio_vec *vec; | |
1985 | ||
1986 | /* bio has the data to be written to device 'i' where | |
1987 | * we just recently had a write error. | |
1988 | * We repeatedly clone the bio and trim down to one block, | |
1989 | * then try the write. Where the write fails we record | |
1990 | * a bad block. | |
1991 | * It is conceivable that the bio doesn't exactly align with | |
1992 | * blocks. We must handle this somehow. | |
1993 | * | |
1994 | * We currently own a reference on the rdev. | |
1995 | */ | |
1996 | ||
1997 | int block_sectors; | |
1998 | sector_t sector; | |
1999 | int sectors; | |
2000 | int sect_to_write = r1_bio->sectors; | |
2001 | int ok = 1; | |
2002 | ||
2003 | if (rdev->badblocks.shift < 0) | |
2004 | return 0; | |
2005 | ||
2006 | block_sectors = 1 << rdev->badblocks.shift; | |
2007 | sector = r1_bio->sector; | |
2008 | sectors = ((sector + block_sectors) | |
2009 | & ~(sector_t)(block_sectors - 1)) | |
2010 | - sector; | |
2011 | ||
2012 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
2013 | vcnt = r1_bio->behind_page_count; | |
2014 | vec = r1_bio->behind_bvecs; | |
2015 | idx = 0; | |
2016 | while (vec[idx].bv_page == NULL) | |
2017 | idx++; | |
2018 | } else { | |
2019 | vcnt = r1_bio->master_bio->bi_vcnt; | |
2020 | vec = r1_bio->master_bio->bi_io_vec; | |
2021 | idx = r1_bio->master_bio->bi_idx; | |
2022 | } | |
2023 | while (sect_to_write) { | |
2024 | struct bio *wbio; | |
2025 | if (sectors > sect_to_write) | |
2026 | sectors = sect_to_write; | |
2027 | /* Write at 'sector' for 'sectors'*/ | |
2028 | ||
2029 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2030 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2031 | wbio->bi_sector = r1_bio->sector; | |
2032 | wbio->bi_rw = WRITE; | |
2033 | wbio->bi_vcnt = vcnt; | |
2034 | wbio->bi_size = r1_bio->sectors << 9; | |
2035 | wbio->bi_idx = idx; | |
2036 | ||
2037 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
2038 | wbio->bi_sector += rdev->data_offset; | |
2039 | wbio->bi_bdev = rdev->bdev; | |
2040 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2041 | /* failure! */ | |
2042 | ok = rdev_set_badblocks(rdev, sector, | |
2043 | sectors, 0) | |
2044 | && ok; | |
2045 | ||
2046 | bio_put(wbio); | |
2047 | sect_to_write -= sectors; | |
2048 | sector += sectors; | |
2049 | sectors = block_sectors; | |
2050 | } | |
2051 | return ok; | |
2052 | } | |
2053 | ||
e8096360 | 2054 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2055 | { |
2056 | int m; | |
2057 | int s = r1_bio->sectors; | |
8f19ccb2 | 2058 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2059 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2060 | struct bio *bio = r1_bio->bios[m]; |
2061 | if (bio->bi_end_io == NULL) | |
2062 | continue; | |
2063 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2064 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
c6563a8c | 2065 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce N |
2066 | } |
2067 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2068 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
2069 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2070 | md_error(conf->mddev, rdev); | |
2071 | } | |
2072 | } | |
2073 | put_buf(r1_bio); | |
2074 | md_done_sync(conf->mddev, s, 1); | |
2075 | } | |
2076 | ||
e8096360 | 2077 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2078 | { |
2079 | int m; | |
8f19ccb2 | 2080 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2081 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2082 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2083 | rdev_clear_badblocks(rdev, |
2084 | r1_bio->sector, | |
c6563a8c | 2085 | r1_bio->sectors, 0); |
62096bce N |
2086 | rdev_dec_pending(rdev, conf->mddev); |
2087 | } else if (r1_bio->bios[m] != NULL) { | |
2088 | /* This drive got a write error. We need to | |
2089 | * narrow down and record precise write | |
2090 | * errors. | |
2091 | */ | |
2092 | if (!narrow_write_error(r1_bio, m)) { | |
2093 | md_error(conf->mddev, | |
2094 | conf->mirrors[m].rdev); | |
2095 | /* an I/O failed, we can't clear the bitmap */ | |
2096 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2097 | } | |
2098 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2099 | conf->mddev); | |
2100 | } | |
2101 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2102 | close_write(r1_bio); | |
2103 | raid_end_bio_io(r1_bio); | |
2104 | } | |
2105 | ||
e8096360 | 2106 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2107 | { |
2108 | int disk; | |
2109 | int max_sectors; | |
fd01b88c | 2110 | struct mddev *mddev = conf->mddev; |
62096bce N |
2111 | struct bio *bio; |
2112 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2113 | struct md_rdev *rdev; |
62096bce N |
2114 | |
2115 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2116 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2117 | * the block and we can fix it. | |
2118 | * We freeze all other IO, and try reading the block from | |
2119 | * other devices. When we find one, we re-write | |
2120 | * and check it that fixes the read error. | |
2121 | * This is all done synchronously while the array is | |
2122 | * frozen | |
2123 | */ | |
2124 | if (mddev->ro == 0) { | |
2125 | freeze_array(conf); | |
2126 | fix_read_error(conf, r1_bio->read_disk, | |
2127 | r1_bio->sector, r1_bio->sectors); | |
2128 | unfreeze_array(conf); | |
2129 | } else | |
2130 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
2131 | ||
2132 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2133 | bdevname(bio->bi_bdev, b); | |
2134 | read_more: | |
2135 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2136 | if (disk == -1) { | |
2137 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
2138 | " read error for block %llu\n", | |
2139 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
2140 | raid_end_bio_io(r1_bio); | |
2141 | } else { | |
2142 | const unsigned long do_sync | |
2143 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
2144 | if (bio) { | |
2145 | r1_bio->bios[r1_bio->read_disk] = | |
2146 | mddev->ro ? IO_BLOCKED : NULL; | |
2147 | bio_put(bio); | |
2148 | } | |
2149 | r1_bio->read_disk = disk; | |
2150 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2151 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
2152 | r1_bio->bios[r1_bio->read_disk] = bio; | |
2153 | rdev = conf->mirrors[disk].rdev; | |
2154 | printk_ratelimited(KERN_ERR | |
2155 | "md/raid1:%s: redirecting sector %llu" | |
2156 | " to other mirror: %s\n", | |
2157 | mdname(mddev), | |
2158 | (unsigned long long)r1_bio->sector, | |
2159 | bdevname(rdev->bdev, b)); | |
2160 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
2161 | bio->bi_bdev = rdev->bdev; | |
2162 | bio->bi_end_io = raid1_end_read_request; | |
2163 | bio->bi_rw = READ | do_sync; | |
2164 | bio->bi_private = r1_bio; | |
2165 | if (max_sectors < r1_bio->sectors) { | |
2166 | /* Drat - have to split this up more */ | |
2167 | struct bio *mbio = r1_bio->master_bio; | |
2168 | int sectors_handled = (r1_bio->sector + max_sectors | |
2169 | - mbio->bi_sector); | |
2170 | r1_bio->sectors = max_sectors; | |
2171 | spin_lock_irq(&conf->device_lock); | |
2172 | if (mbio->bi_phys_segments == 0) | |
2173 | mbio->bi_phys_segments = 2; | |
2174 | else | |
2175 | mbio->bi_phys_segments++; | |
2176 | spin_unlock_irq(&conf->device_lock); | |
2177 | generic_make_request(bio); | |
2178 | bio = NULL; | |
2179 | ||
2180 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2181 | ||
2182 | r1_bio->master_bio = mbio; | |
2183 | r1_bio->sectors = (mbio->bi_size >> 9) | |
2184 | - sectors_handled; | |
2185 | r1_bio->state = 0; | |
2186 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2187 | r1_bio->mddev = mddev; | |
2188 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2189 | ||
2190 | goto read_more; | |
2191 | } else | |
2192 | generic_make_request(bio); | |
2193 | } | |
2194 | } | |
2195 | ||
fd01b88c | 2196 | static void raid1d(struct mddev *mddev) |
1da177e4 | 2197 | { |
9f2c9d12 | 2198 | struct r1bio *r1_bio; |
1da177e4 | 2199 | unsigned long flags; |
e8096360 | 2200 | struct r1conf *conf = mddev->private; |
1da177e4 | 2201 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2202 | struct blk_plug plug; |
1da177e4 LT |
2203 | |
2204 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2205 | |
2206 | blk_start_plug(&plug); | |
1da177e4 | 2207 | for (;;) { |
191ea9b2 | 2208 | |
c3b328ac N |
2209 | if (atomic_read(&mddev->plug_cnt) == 0) |
2210 | flush_pending_writes(conf); | |
191ea9b2 | 2211 | |
a35e63ef N |
2212 | spin_lock_irqsave(&conf->device_lock, flags); |
2213 | if (list_empty(head)) { | |
2214 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2215 | break; |
a35e63ef | 2216 | } |
9f2c9d12 | 2217 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2218 | list_del(head->prev); |
ddaf22ab | 2219 | conf->nr_queued--; |
1da177e4 LT |
2220 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2221 | ||
2222 | mddev = r1_bio->mddev; | |
070ec55d | 2223 | conf = mddev->private; |
4367af55 | 2224 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2225 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2226 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2227 | handle_sync_write_finished(conf, r1_bio); | |
2228 | else | |
4367af55 | 2229 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2230 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2231 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2232 | handle_write_finished(conf, r1_bio); | |
2233 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2234 | handle_read_error(conf, r1_bio); | |
2235 | else | |
d2eb35ac N |
2236 | /* just a partial read to be scheduled from separate |
2237 | * context | |
2238 | */ | |
2239 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2240 | |
1d9d5241 | 2241 | cond_resched(); |
de393cde N |
2242 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2243 | md_check_recovery(mddev); | |
1da177e4 | 2244 | } |
e1dfa0a2 | 2245 | blk_finish_plug(&plug); |
1da177e4 LT |
2246 | } |
2247 | ||
2248 | ||
e8096360 | 2249 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2250 | { |
2251 | int buffs; | |
2252 | ||
2253 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2254 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2255 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2256 | conf->poolinfo); | |
2257 | if (!conf->r1buf_pool) | |
2258 | return -ENOMEM; | |
2259 | conf->next_resync = 0; | |
2260 | return 0; | |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * perform a "sync" on one "block" | |
2265 | * | |
2266 | * We need to make sure that no normal I/O request - particularly write | |
2267 | * requests - conflict with active sync requests. | |
2268 | * | |
2269 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2270 | * that can be installed to exclude normal IO requests. | |
2271 | */ | |
2272 | ||
fd01b88c | 2273 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2274 | { |
e8096360 | 2275 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2276 | struct r1bio *r1_bio; |
1da177e4 LT |
2277 | struct bio *bio; |
2278 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2279 | int disk = -1; |
1da177e4 | 2280 | int i; |
3e198f78 N |
2281 | int wonly = -1; |
2282 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2283 | sector_t sync_blocks; |
e3b9703e | 2284 | int still_degraded = 0; |
06f60385 N |
2285 | int good_sectors = RESYNC_SECTORS; |
2286 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2287 | |
2288 | if (!conf->r1buf_pool) | |
2289 | if (init_resync(conf)) | |
57afd89f | 2290 | return 0; |
1da177e4 | 2291 | |
58c0fed4 | 2292 | max_sector = mddev->dev_sectors; |
1da177e4 | 2293 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2294 | /* If we aborted, we need to abort the |
2295 | * sync on the 'current' bitmap chunk (there will | |
2296 | * only be one in raid1 resync. | |
2297 | * We can find the current addess in mddev->curr_resync | |
2298 | */ | |
6a806c51 N |
2299 | if (mddev->curr_resync < max_sector) /* aborted */ |
2300 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2301 | &sync_blocks, 1); |
6a806c51 | 2302 | else /* completed sync */ |
191ea9b2 | 2303 | conf->fullsync = 0; |
6a806c51 N |
2304 | |
2305 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2306 | close_sync(conf); |
2307 | return 0; | |
2308 | } | |
2309 | ||
07d84d10 N |
2310 | if (mddev->bitmap == NULL && |
2311 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2312 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2313 | conf->fullsync == 0) { |
2314 | *skipped = 1; | |
2315 | return max_sector - sector_nr; | |
2316 | } | |
6394cca5 N |
2317 | /* before building a request, check if we can skip these blocks.. |
2318 | * This call the bitmap_start_sync doesn't actually record anything | |
2319 | */ | |
e3b9703e | 2320 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2321 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2322 | /* We can skip this block, and probably several more */ |
2323 | *skipped = 1; | |
2324 | return sync_blocks; | |
2325 | } | |
1da177e4 | 2326 | /* |
17999be4 N |
2327 | * If there is non-resync activity waiting for a turn, |
2328 | * and resync is going fast enough, | |
2329 | * then let it though before starting on this new sync request. | |
1da177e4 | 2330 | */ |
17999be4 | 2331 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2332 | msleep_interruptible(1000); |
17999be4 | 2333 | |
b47490c9 | 2334 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2335 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2336 | raise_barrier(conf); |
2337 | ||
2338 | conf->next_resync = sector_nr; | |
1da177e4 | 2339 | |
3e198f78 | 2340 | rcu_read_lock(); |
1da177e4 | 2341 | /* |
3e198f78 N |
2342 | * If we get a correctably read error during resync or recovery, |
2343 | * we might want to read from a different device. So we | |
2344 | * flag all drives that could conceivably be read from for READ, | |
2345 | * and any others (which will be non-In_sync devices) for WRITE. | |
2346 | * If a read fails, we try reading from something else for which READ | |
2347 | * is OK. | |
1da177e4 | 2348 | */ |
1da177e4 | 2349 | |
1da177e4 LT |
2350 | r1_bio->mddev = mddev; |
2351 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2352 | r1_bio->state = 0; |
1da177e4 | 2353 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 | 2354 | |
8f19ccb2 | 2355 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2356 | struct md_rdev *rdev; |
1da177e4 LT |
2357 | bio = r1_bio->bios[i]; |
2358 | ||
2359 | /* take from bio_init */ | |
2360 | bio->bi_next = NULL; | |
db8d9d35 | 2361 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2362 | bio->bi_flags |= 1 << BIO_UPTODATE; |
802ba064 | 2363 | bio->bi_rw = READ; |
1da177e4 LT |
2364 | bio->bi_vcnt = 0; |
2365 | bio->bi_idx = 0; | |
2366 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2367 | bio->bi_size = 0; |
2368 | bio->bi_end_io = NULL; | |
2369 | bio->bi_private = NULL; | |
2370 | ||
3e198f78 N |
2371 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2372 | if (rdev == NULL || | |
06f60385 | 2373 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2374 | if (i < conf->raid_disks) |
2375 | still_degraded = 1; | |
3e198f78 | 2376 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2377 | bio->bi_rw = WRITE; |
2378 | bio->bi_end_io = end_sync_write; | |
2379 | write_targets ++; | |
3e198f78 N |
2380 | } else { |
2381 | /* may need to read from here */ | |
06f60385 N |
2382 | sector_t first_bad = MaxSector; |
2383 | int bad_sectors; | |
2384 | ||
2385 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2386 | &first_bad, &bad_sectors)) { | |
2387 | if (first_bad > sector_nr) | |
2388 | good_sectors = first_bad - sector_nr; | |
2389 | else { | |
2390 | bad_sectors -= (sector_nr - first_bad); | |
2391 | if (min_bad == 0 || | |
2392 | min_bad > bad_sectors) | |
2393 | min_bad = bad_sectors; | |
2394 | } | |
2395 | } | |
2396 | if (sector_nr < first_bad) { | |
2397 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2398 | if (wonly < 0) | |
2399 | wonly = i; | |
2400 | } else { | |
2401 | if (disk < 0) | |
2402 | disk = i; | |
2403 | } | |
2404 | bio->bi_rw = READ; | |
2405 | bio->bi_end_io = end_sync_read; | |
2406 | read_targets++; | |
3e198f78 | 2407 | } |
3e198f78 | 2408 | } |
06f60385 N |
2409 | if (bio->bi_end_io) { |
2410 | atomic_inc(&rdev->nr_pending); | |
2411 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2412 | bio->bi_bdev = rdev->bdev; | |
2413 | bio->bi_private = r1_bio; | |
2414 | } | |
1da177e4 | 2415 | } |
3e198f78 N |
2416 | rcu_read_unlock(); |
2417 | if (disk < 0) | |
2418 | disk = wonly; | |
2419 | r1_bio->read_disk = disk; | |
191ea9b2 | 2420 | |
06f60385 N |
2421 | if (read_targets == 0 && min_bad > 0) { |
2422 | /* These sectors are bad on all InSync devices, so we | |
2423 | * need to mark them bad on all write targets | |
2424 | */ | |
2425 | int ok = 1; | |
8f19ccb2 | 2426 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2427 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2428 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2429 | ok = rdev_set_badblocks(rdev, sector_nr, |
2430 | min_bad, 0 | |
2431 | ) && ok; | |
2432 | } | |
2433 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2434 | *skipped = 1; | |
2435 | put_buf(r1_bio); | |
2436 | ||
2437 | if (!ok) { | |
2438 | /* Cannot record the badblocks, so need to | |
2439 | * abort the resync. | |
2440 | * If there are multiple read targets, could just | |
2441 | * fail the really bad ones ??? | |
2442 | */ | |
2443 | conf->recovery_disabled = mddev->recovery_disabled; | |
2444 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2445 | return 0; | |
2446 | } else | |
2447 | return min_bad; | |
2448 | ||
2449 | } | |
2450 | if (min_bad > 0 && min_bad < good_sectors) { | |
2451 | /* only resync enough to reach the next bad->good | |
2452 | * transition */ | |
2453 | good_sectors = min_bad; | |
2454 | } | |
2455 | ||
3e198f78 N |
2456 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2457 | /* extra read targets are also write targets */ | |
2458 | write_targets += read_targets-1; | |
2459 | ||
2460 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2461 | /* There is nowhere to write, so all non-sync |
2462 | * drives must be failed - so we are finished | |
2463 | */ | |
57afd89f N |
2464 | sector_t rv = max_sector - sector_nr; |
2465 | *skipped = 1; | |
1da177e4 | 2466 | put_buf(r1_bio); |
1da177e4 LT |
2467 | return rv; |
2468 | } | |
2469 | ||
c6207277 N |
2470 | if (max_sector > mddev->resync_max) |
2471 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2472 | if (max_sector > sector_nr + good_sectors) |
2473 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2474 | nr_sectors = 0; |
289e99e8 | 2475 | sync_blocks = 0; |
1da177e4 LT |
2476 | do { |
2477 | struct page *page; | |
2478 | int len = PAGE_SIZE; | |
2479 | if (sector_nr + (len>>9) > max_sector) | |
2480 | len = (max_sector - sector_nr) << 9; | |
2481 | if (len == 0) | |
2482 | break; | |
6a806c51 N |
2483 | if (sync_blocks == 0) { |
2484 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2485 | &sync_blocks, still_degraded) && |
2486 | !conf->fullsync && | |
2487 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2488 | break; |
9e77c485 | 2489 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2490 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2491 | len = sync_blocks<<9; |
ab7a30c7 | 2492 | } |
191ea9b2 | 2493 | |
8f19ccb2 | 2494 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2495 | bio = r1_bio->bios[i]; |
2496 | if (bio->bi_end_io) { | |
d11c171e | 2497 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2498 | if (bio_add_page(bio, page, len, 0) == 0) { |
2499 | /* stop here */ | |
d11c171e | 2500 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2501 | while (i > 0) { |
2502 | i--; | |
2503 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2504 | if (bio->bi_end_io==NULL) |
2505 | continue; | |
1da177e4 LT |
2506 | /* remove last page from this bio */ |
2507 | bio->bi_vcnt--; | |
2508 | bio->bi_size -= len; | |
2509 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2510 | } | |
2511 | goto bio_full; | |
2512 | } | |
2513 | } | |
2514 | } | |
2515 | nr_sectors += len>>9; | |
2516 | sector_nr += len>>9; | |
191ea9b2 | 2517 | sync_blocks -= (len>>9); |
1da177e4 LT |
2518 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2519 | bio_full: | |
1da177e4 LT |
2520 | r1_bio->sectors = nr_sectors; |
2521 | ||
d11c171e N |
2522 | /* For a user-requested sync, we read all readable devices and do a |
2523 | * compare | |
2524 | */ | |
2525 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2526 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2527 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2528 | bio = r1_bio->bios[i]; |
2529 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2530 | read_targets--; |
ddac7c7e | 2531 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2532 | generic_make_request(bio); |
2533 | } | |
2534 | } | |
2535 | } else { | |
2536 | atomic_set(&r1_bio->remaining, 1); | |
2537 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2538 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2539 | generic_make_request(bio); |
1da177e4 | 2540 | |
d11c171e | 2541 | } |
1da177e4 LT |
2542 | return nr_sectors; |
2543 | } | |
2544 | ||
fd01b88c | 2545 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2546 | { |
2547 | if (sectors) | |
2548 | return sectors; | |
2549 | ||
2550 | return mddev->dev_sectors; | |
2551 | } | |
2552 | ||
e8096360 | 2553 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2554 | { |
e8096360 | 2555 | struct r1conf *conf; |
709ae487 | 2556 | int i; |
0eaf822c | 2557 | struct raid1_info *disk; |
3cb03002 | 2558 | struct md_rdev *rdev; |
709ae487 | 2559 | int err = -ENOMEM; |
1da177e4 | 2560 | |
e8096360 | 2561 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2562 | if (!conf) |
709ae487 | 2563 | goto abort; |
1da177e4 | 2564 | |
0eaf822c | 2565 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2566 | * mddev->raid_disks * 2, |
1da177e4 LT |
2567 | GFP_KERNEL); |
2568 | if (!conf->mirrors) | |
709ae487 | 2569 | goto abort; |
1da177e4 | 2570 | |
ddaf22ab N |
2571 | conf->tmppage = alloc_page(GFP_KERNEL); |
2572 | if (!conf->tmppage) | |
709ae487 | 2573 | goto abort; |
ddaf22ab | 2574 | |
709ae487 | 2575 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2576 | if (!conf->poolinfo) |
709ae487 | 2577 | goto abort; |
8f19ccb2 | 2578 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2579 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2580 | r1bio_pool_free, | |
2581 | conf->poolinfo); | |
2582 | if (!conf->r1bio_pool) | |
709ae487 N |
2583 | goto abort; |
2584 | ||
ed9bfdf1 | 2585 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2586 | |
c19d5798 | 2587 | err = -EINVAL; |
e7e72bf6 | 2588 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2589 | rdev_for_each(rdev, mddev) { |
aba336bd | 2590 | struct request_queue *q; |
709ae487 | 2591 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2592 | if (disk_idx >= mddev->raid_disks |
2593 | || disk_idx < 0) | |
2594 | continue; | |
c19d5798 N |
2595 | if (test_bit(Replacement, &rdev->flags)) |
2596 | disk = conf->mirrors + conf->raid_disks + disk_idx; | |
2597 | else | |
2598 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2599 | |
c19d5798 N |
2600 | if (disk->rdev) |
2601 | goto abort; | |
1da177e4 | 2602 | disk->rdev = rdev; |
aba336bd N |
2603 | q = bdev_get_queue(rdev->bdev); |
2604 | if (q->merge_bvec_fn) | |
2605 | mddev->merge_check_needed = 1; | |
1da177e4 LT |
2606 | |
2607 | disk->head_position = 0; | |
1da177e4 LT |
2608 | } |
2609 | conf->raid_disks = mddev->raid_disks; | |
2610 | conf->mddev = mddev; | |
1da177e4 | 2611 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2612 | |
2613 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2614 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2615 | |
191ea9b2 | 2616 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2617 | conf->pending_count = 0; |
d890fa2b | 2618 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2619 | |
c19d5798 | 2620 | err = -EIO; |
8f19ccb2 | 2621 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2622 | |
2623 | disk = conf->mirrors + i; | |
2624 | ||
c19d5798 N |
2625 | if (i < conf->raid_disks && |
2626 | disk[conf->raid_disks].rdev) { | |
2627 | /* This slot has a replacement. */ | |
2628 | if (!disk->rdev) { | |
2629 | /* No original, just make the replacement | |
2630 | * a recovering spare | |
2631 | */ | |
2632 | disk->rdev = | |
2633 | disk[conf->raid_disks].rdev; | |
2634 | disk[conf->raid_disks].rdev = NULL; | |
2635 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2636 | /* Original is not in_sync - bad */ | |
2637 | goto abort; | |
2638 | } | |
2639 | ||
5fd6c1dc N |
2640 | if (!disk->rdev || |
2641 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2642 | disk->head_position = 0; |
4f0a5e01 JB |
2643 | if (disk->rdev && |
2644 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2645 | conf->fullsync = 1; |
be4d3280 | 2646 | } |
1da177e4 | 2647 | } |
709ae487 | 2648 | |
709ae487 | 2649 | err = -ENOMEM; |
0232605d | 2650 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
709ae487 N |
2651 | if (!conf->thread) { |
2652 | printk(KERN_ERR | |
9dd1e2fa | 2653 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2654 | mdname(mddev)); |
2655 | goto abort; | |
11ce99e6 | 2656 | } |
1da177e4 | 2657 | |
709ae487 N |
2658 | return conf; |
2659 | ||
2660 | abort: | |
2661 | if (conf) { | |
2662 | if (conf->r1bio_pool) | |
2663 | mempool_destroy(conf->r1bio_pool); | |
2664 | kfree(conf->mirrors); | |
2665 | safe_put_page(conf->tmppage); | |
2666 | kfree(conf->poolinfo); | |
2667 | kfree(conf); | |
2668 | } | |
2669 | return ERR_PTR(err); | |
2670 | } | |
2671 | ||
5220ea1e | 2672 | static int stop(struct mddev *mddev); |
fd01b88c | 2673 | static int run(struct mddev *mddev) |
709ae487 | 2674 | { |
e8096360 | 2675 | struct r1conf *conf; |
709ae487 | 2676 | int i; |
3cb03002 | 2677 | struct md_rdev *rdev; |
5220ea1e | 2678 | int ret; |
709ae487 N |
2679 | |
2680 | if (mddev->level != 1) { | |
9dd1e2fa | 2681 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2682 | mdname(mddev), mddev->level); |
2683 | return -EIO; | |
2684 | } | |
2685 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2686 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2687 | mdname(mddev)); |
2688 | return -EIO; | |
2689 | } | |
1da177e4 | 2690 | /* |
709ae487 N |
2691 | * copy the already verified devices into our private RAID1 |
2692 | * bookkeeping area. [whatever we allocate in run(), | |
2693 | * should be freed in stop()] | |
1da177e4 | 2694 | */ |
709ae487 N |
2695 | if (mddev->private == NULL) |
2696 | conf = setup_conf(mddev); | |
2697 | else | |
2698 | conf = mddev->private; | |
1da177e4 | 2699 | |
709ae487 N |
2700 | if (IS_ERR(conf)) |
2701 | return PTR_ERR(conf); | |
1da177e4 | 2702 | |
dafb20fa | 2703 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
2704 | if (!mddev->gendisk) |
2705 | continue; | |
709ae487 N |
2706 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2707 | rdev->data_offset << 9); | |
1da177e4 | 2708 | } |
191ea9b2 | 2709 | |
709ae487 N |
2710 | mddev->degraded = 0; |
2711 | for (i=0; i < conf->raid_disks; i++) | |
2712 | if (conf->mirrors[i].rdev == NULL || | |
2713 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2714 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2715 | mddev->degraded++; | |
2716 | ||
2717 | if (conf->raid_disks - mddev->degraded == 1) | |
2718 | mddev->recovery_cp = MaxSector; | |
2719 | ||
8c6ac868 | 2720 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2721 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2722 | " -- starting background reconstruction\n", |
2723 | mdname(mddev)); | |
1da177e4 | 2724 | printk(KERN_INFO |
9dd1e2fa | 2725 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2726 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2727 | mddev->raid_disks); | |
709ae487 | 2728 | |
1da177e4 LT |
2729 | /* |
2730 | * Ok, everything is just fine now | |
2731 | */ | |
709ae487 N |
2732 | mddev->thread = conf->thread; |
2733 | conf->thread = NULL; | |
2734 | mddev->private = conf; | |
2735 | ||
1f403624 | 2736 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2737 | |
1ed7242e JB |
2738 | if (mddev->queue) { |
2739 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2740 | mddev->queue->backing_dev_info.congested_data = mddev; | |
6b740b8d | 2741 | blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); |
1ed7242e | 2742 | } |
5220ea1e | 2743 | |
2744 | ret = md_integrity_register(mddev); | |
2745 | if (ret) | |
2746 | stop(mddev); | |
2747 | return ret; | |
1da177e4 LT |
2748 | } |
2749 | ||
fd01b88c | 2750 | static int stop(struct mddev *mddev) |
1da177e4 | 2751 | { |
e8096360 | 2752 | struct r1conf *conf = mddev->private; |
4b6d287f | 2753 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2754 | |
2755 | /* wait for behind writes to complete */ | |
e555190d | 2756 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2757 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2758 | mdname(mddev)); | |
4b6d287f | 2759 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2760 | wait_event(bitmap->behind_wait, |
2761 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2762 | } |
1da177e4 | 2763 | |
409c57f3 N |
2764 | raise_barrier(conf); |
2765 | lower_barrier(conf); | |
2766 | ||
01f96c0a | 2767 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2768 | if (conf->r1bio_pool) |
2769 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2770 | kfree(conf->mirrors); |
2771 | kfree(conf->poolinfo); | |
1da177e4 LT |
2772 | kfree(conf); |
2773 | mddev->private = NULL; | |
2774 | return 0; | |
2775 | } | |
2776 | ||
fd01b88c | 2777 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2778 | { |
2779 | /* no resync is happening, and there is enough space | |
2780 | * on all devices, so we can resize. | |
2781 | * We need to make sure resync covers any new space. | |
2782 | * If the array is shrinking we should possibly wait until | |
2783 | * any io in the removed space completes, but it hardly seems | |
2784 | * worth it. | |
2785 | */ | |
a4a6125a N |
2786 | sector_t newsize = raid1_size(mddev, sectors, 0); |
2787 | if (mddev->external_size && | |
2788 | mddev->array_sectors > newsize) | |
b522adcd | 2789 | return -EINVAL; |
a4a6125a N |
2790 | if (mddev->bitmap) { |
2791 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
2792 | if (ret) | |
2793 | return ret; | |
2794 | } | |
2795 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 2796 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2797 | revalidate_disk(mddev->gendisk); |
b522adcd | 2798 | if (sectors > mddev->dev_sectors && |
b098636c | 2799 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2800 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2801 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2802 | } | |
b522adcd | 2803 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2804 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2805 | return 0; |
2806 | } | |
2807 | ||
fd01b88c | 2808 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
2809 | { |
2810 | /* We need to: | |
2811 | * 1/ resize the r1bio_pool | |
2812 | * 2/ resize conf->mirrors | |
2813 | * | |
2814 | * We allocate a new r1bio_pool if we can. | |
2815 | * Then raise a device barrier and wait until all IO stops. | |
2816 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2817 | * |
2818 | * At the same time, we "pack" the devices so that all the missing | |
2819 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2820 | */ |
2821 | mempool_t *newpool, *oldpool; | |
2822 | struct pool_info *newpoolinfo; | |
0eaf822c | 2823 | struct raid1_info *newmirrors; |
e8096360 | 2824 | struct r1conf *conf = mddev->private; |
63c70c4f | 2825 | int cnt, raid_disks; |
c04be0aa | 2826 | unsigned long flags; |
b5470dc5 | 2827 | int d, d2, err; |
1da177e4 | 2828 | |
63c70c4f | 2829 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2830 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2831 | mddev->layout != mddev->new_layout || |
2832 | mddev->level != mddev->new_level) { | |
664e7c41 | 2833 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2834 | mddev->new_layout = mddev->layout; |
2835 | mddev->new_level = mddev->level; | |
2836 | return -EINVAL; | |
2837 | } | |
2838 | ||
b5470dc5 DW |
2839 | err = md_allow_write(mddev); |
2840 | if (err) | |
2841 | return err; | |
2a2275d6 | 2842 | |
63c70c4f N |
2843 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2844 | ||
6ea9c07c N |
2845 | if (raid_disks < conf->raid_disks) { |
2846 | cnt=0; | |
2847 | for (d= 0; d < conf->raid_disks; d++) | |
2848 | if (conf->mirrors[d].rdev) | |
2849 | cnt++; | |
2850 | if (cnt > raid_disks) | |
1da177e4 | 2851 | return -EBUSY; |
6ea9c07c | 2852 | } |
1da177e4 LT |
2853 | |
2854 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2855 | if (!newpoolinfo) | |
2856 | return -ENOMEM; | |
2857 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 2858 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
2859 | |
2860 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2861 | r1bio_pool_free, newpoolinfo); | |
2862 | if (!newpool) { | |
2863 | kfree(newpoolinfo); | |
2864 | return -ENOMEM; | |
2865 | } | |
0eaf822c | 2866 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 2867 | GFP_KERNEL); |
1da177e4 LT |
2868 | if (!newmirrors) { |
2869 | kfree(newpoolinfo); | |
2870 | mempool_destroy(newpool); | |
2871 | return -ENOMEM; | |
2872 | } | |
1da177e4 | 2873 | |
17999be4 | 2874 | raise_barrier(conf); |
1da177e4 LT |
2875 | |
2876 | /* ok, everything is stopped */ | |
2877 | oldpool = conf->r1bio_pool; | |
2878 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2879 | |
a88aa786 | 2880 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 2881 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 2882 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 2883 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2884 | rdev->raid_disk = d2; |
36fad858 NK |
2885 | sysfs_unlink_rdev(mddev, rdev); |
2886 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2887 | printk(KERN_WARNING |
36fad858 NK |
2888 | "md/raid1:%s: cannot register rd%d\n", |
2889 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2890 | } |
a88aa786 N |
2891 | if (rdev) |
2892 | newmirrors[d2++].rdev = rdev; | |
2893 | } | |
1da177e4 LT |
2894 | kfree(conf->mirrors); |
2895 | conf->mirrors = newmirrors; | |
2896 | kfree(conf->poolinfo); | |
2897 | conf->poolinfo = newpoolinfo; | |
2898 | ||
c04be0aa | 2899 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2900 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2901 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2902 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2903 | mddev->delta_disks = 0; |
1da177e4 | 2904 | |
17999be4 | 2905 | lower_barrier(conf); |
1da177e4 LT |
2906 | |
2907 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2908 | md_wakeup_thread(mddev->thread); | |
2909 | ||
2910 | mempool_destroy(oldpool); | |
2911 | return 0; | |
2912 | } | |
2913 | ||
fd01b88c | 2914 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 2915 | { |
e8096360 | 2916 | struct r1conf *conf = mddev->private; |
36fa3063 N |
2917 | |
2918 | switch(state) { | |
6eef4b21 N |
2919 | case 2: /* wake for suspend */ |
2920 | wake_up(&conf->wait_barrier); | |
2921 | break; | |
9e6603da | 2922 | case 1: |
17999be4 | 2923 | raise_barrier(conf); |
36fa3063 | 2924 | break; |
9e6603da | 2925 | case 0: |
17999be4 | 2926 | lower_barrier(conf); |
36fa3063 N |
2927 | break; |
2928 | } | |
36fa3063 N |
2929 | } |
2930 | ||
fd01b88c | 2931 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
2932 | { |
2933 | /* raid1 can take over: | |
2934 | * raid5 with 2 devices, any layout or chunk size | |
2935 | */ | |
2936 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 2937 | struct r1conf *conf; |
709ae487 N |
2938 | mddev->new_level = 1; |
2939 | mddev->new_layout = 0; | |
2940 | mddev->new_chunk_sectors = 0; | |
2941 | conf = setup_conf(mddev); | |
2942 | if (!IS_ERR(conf)) | |
2943 | conf->barrier = 1; | |
2944 | return conf; | |
2945 | } | |
2946 | return ERR_PTR(-EINVAL); | |
2947 | } | |
1da177e4 | 2948 | |
84fc4b56 | 2949 | static struct md_personality raid1_personality = |
1da177e4 LT |
2950 | { |
2951 | .name = "raid1", | |
2604b703 | 2952 | .level = 1, |
1da177e4 LT |
2953 | .owner = THIS_MODULE, |
2954 | .make_request = make_request, | |
2955 | .run = run, | |
2956 | .stop = stop, | |
2957 | .status = status, | |
2958 | .error_handler = error, | |
2959 | .hot_add_disk = raid1_add_disk, | |
2960 | .hot_remove_disk= raid1_remove_disk, | |
2961 | .spare_active = raid1_spare_active, | |
2962 | .sync_request = sync_request, | |
2963 | .resize = raid1_resize, | |
80c3a6ce | 2964 | .size = raid1_size, |
63c70c4f | 2965 | .check_reshape = raid1_reshape, |
36fa3063 | 2966 | .quiesce = raid1_quiesce, |
709ae487 | 2967 | .takeover = raid1_takeover, |
1da177e4 LT |
2968 | }; |
2969 | ||
2970 | static int __init raid_init(void) | |
2971 | { | |
2604b703 | 2972 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2973 | } |
2974 | ||
2975 | static void raid_exit(void) | |
2976 | { | |
2604b703 | 2977 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2978 | } |
2979 | ||
2980 | module_init(raid_init); | |
2981 | module_exit(raid_exit); | |
2982 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2983 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2984 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2985 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2986 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
2987 | |
2988 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |