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 | |
7ad4d4a6 | 336 | if (uptodate) { |
1da177e4 | 337 | raid_end_bio_io(r1_bio); |
7ad4d4a6 N |
338 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
339 | } else { | |
1da177e4 LT |
340 | /* |
341 | * oops, read error: | |
342 | */ | |
343 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
344 | printk_ratelimited( |
345 | KERN_ERR "md/raid1:%s: %s: " | |
346 | "rescheduling sector %llu\n", | |
347 | mdname(conf->mddev), | |
348 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
349 | b), | |
350 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 351 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 352 | reschedule_retry(r1_bio); |
7ad4d4a6 | 353 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 354 | } |
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; |
12cee5a8 | 507 | int choose_next_idle; |
1da177e4 LT |
508 | |
509 | rcu_read_lock(); | |
510 | /* | |
8ddf9efe | 511 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
512 | * device if no resync is going on, or below the resync window. |
513 | * We take the first readable disk when above the resync window. | |
514 | */ | |
515 | retry: | |
d2eb35ac | 516 | sectors = r1_bio->sectors; |
76073054 | 517 | best_disk = -1; |
9dedf603 | 518 | best_dist_disk = -1; |
76073054 | 519 | best_dist = MaxSector; |
9dedf603 SL |
520 | best_pending_disk = -1; |
521 | min_pending = UINT_MAX; | |
d2eb35ac | 522 | best_good_sectors = 0; |
9dedf603 | 523 | has_nonrot_disk = 0; |
12cee5a8 | 524 | choose_next_idle = 0; |
d2eb35ac | 525 | |
1da177e4 | 526 | if (conf->mddev->recovery_cp < MaxSector && |
be4d3280 | 527 | (this_sector + sectors >= conf->next_resync)) |
f3ac8bf7 | 528 | choose_first = 1; |
be4d3280 | 529 | else |
f3ac8bf7 | 530 | choose_first = 0; |
1da177e4 | 531 | |
be4d3280 | 532 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 533 | sector_t dist; |
d2eb35ac N |
534 | sector_t first_bad; |
535 | int bad_sectors; | |
9dedf603 | 536 | unsigned int pending; |
12cee5a8 | 537 | bool nonrot; |
d2eb35ac | 538 | |
f3ac8bf7 N |
539 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
540 | if (r1_bio->bios[disk] == IO_BLOCKED | |
541 | || rdev == NULL | |
6b740b8d | 542 | || test_bit(Unmerged, &rdev->flags) |
76073054 | 543 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 544 | continue; |
76073054 N |
545 | if (!test_bit(In_sync, &rdev->flags) && |
546 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 547 | continue; |
76073054 N |
548 | if (test_bit(WriteMostly, &rdev->flags)) { |
549 | /* Don't balance among write-mostly, just | |
550 | * use the first as a last resort */ | |
307729c8 N |
551 | if (best_disk < 0) { |
552 | if (is_badblock(rdev, this_sector, sectors, | |
553 | &first_bad, &bad_sectors)) { | |
554 | if (first_bad < this_sector) | |
555 | /* Cannot use this */ | |
556 | continue; | |
557 | best_good_sectors = first_bad - this_sector; | |
558 | } else | |
559 | best_good_sectors = sectors; | |
76073054 | 560 | best_disk = disk; |
307729c8 | 561 | } |
76073054 N |
562 | continue; |
563 | } | |
564 | /* This is a reasonable device to use. It might | |
565 | * even be best. | |
566 | */ | |
d2eb35ac N |
567 | if (is_badblock(rdev, this_sector, sectors, |
568 | &first_bad, &bad_sectors)) { | |
569 | if (best_dist < MaxSector) | |
570 | /* already have a better device */ | |
571 | continue; | |
572 | if (first_bad <= this_sector) { | |
573 | /* cannot read here. If this is the 'primary' | |
574 | * device, then we must not read beyond | |
575 | * bad_sectors from another device.. | |
576 | */ | |
577 | bad_sectors -= (this_sector - first_bad); | |
578 | if (choose_first && sectors > bad_sectors) | |
579 | sectors = bad_sectors; | |
580 | if (best_good_sectors > sectors) | |
581 | best_good_sectors = sectors; | |
582 | ||
583 | } else { | |
584 | sector_t good_sectors = first_bad - this_sector; | |
585 | if (good_sectors > best_good_sectors) { | |
586 | best_good_sectors = good_sectors; | |
587 | best_disk = disk; | |
588 | } | |
589 | if (choose_first) | |
590 | break; | |
591 | } | |
592 | continue; | |
593 | } else | |
594 | best_good_sectors = sectors; | |
595 | ||
12cee5a8 SL |
596 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
597 | has_nonrot_disk |= nonrot; | |
9dedf603 | 598 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 599 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 600 | if (choose_first) { |
76073054 | 601 | best_disk = disk; |
1da177e4 LT |
602 | break; |
603 | } | |
12cee5a8 SL |
604 | /* Don't change to another disk for sequential reads */ |
605 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
606 | || dist == 0) { | |
607 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
608 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
609 | ||
610 | best_disk = disk; | |
611 | /* | |
612 | * If buffered sequential IO size exceeds optimal | |
613 | * iosize, check if there is idle disk. If yes, choose | |
614 | * the idle disk. read_balance could already choose an | |
615 | * idle disk before noticing it's a sequential IO in | |
616 | * this disk. This doesn't matter because this disk | |
617 | * will idle, next time it will be utilized after the | |
618 | * first disk has IO size exceeds optimal iosize. In | |
619 | * this way, iosize of the first disk will be optimal | |
620 | * iosize at least. iosize of the second disk might be | |
621 | * small, but not a big deal since when the second disk | |
622 | * starts IO, the first disk is likely still busy. | |
623 | */ | |
624 | if (nonrot && opt_iosize > 0 && | |
625 | mirror->seq_start != MaxSector && | |
626 | mirror->next_seq_sect > opt_iosize && | |
627 | mirror->next_seq_sect - opt_iosize >= | |
628 | mirror->seq_start) { | |
629 | choose_next_idle = 1; | |
630 | continue; | |
631 | } | |
632 | break; | |
633 | } | |
634 | /* If device is idle, use it */ | |
635 | if (pending == 0) { | |
636 | best_disk = disk; | |
637 | break; | |
638 | } | |
639 | ||
640 | if (choose_next_idle) | |
641 | continue; | |
9dedf603 SL |
642 | |
643 | if (min_pending > pending) { | |
644 | min_pending = pending; | |
645 | best_pending_disk = disk; | |
646 | } | |
647 | ||
76073054 N |
648 | if (dist < best_dist) { |
649 | best_dist = dist; | |
9dedf603 | 650 | best_dist_disk = disk; |
1da177e4 | 651 | } |
f3ac8bf7 | 652 | } |
1da177e4 | 653 | |
9dedf603 SL |
654 | /* |
655 | * If all disks are rotational, choose the closest disk. If any disk is | |
656 | * non-rotational, choose the disk with less pending request even the | |
657 | * disk is rotational, which might/might not be optimal for raids with | |
658 | * mixed ratation/non-rotational disks depending on workload. | |
659 | */ | |
660 | if (best_disk == -1) { | |
661 | if (has_nonrot_disk) | |
662 | best_disk = best_pending_disk; | |
663 | else | |
664 | best_disk = best_dist_disk; | |
665 | } | |
666 | ||
76073054 N |
667 | if (best_disk >= 0) { |
668 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
669 | if (!rdev) |
670 | goto retry; | |
671 | atomic_inc(&rdev->nr_pending); | |
76073054 | 672 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
673 | /* cannot risk returning a device that failed |
674 | * before we inc'ed nr_pending | |
675 | */ | |
03c902e1 | 676 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
677 | goto retry; |
678 | } | |
d2eb35ac | 679 | sectors = best_good_sectors; |
12cee5a8 SL |
680 | |
681 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
682 | conf->mirrors[best_disk].seq_start = this_sector; | |
683 | ||
be4d3280 | 684 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
685 | } |
686 | rcu_read_unlock(); | |
d2eb35ac | 687 | *max_sectors = sectors; |
1da177e4 | 688 | |
76073054 | 689 | return best_disk; |
1da177e4 LT |
690 | } |
691 | ||
6b740b8d N |
692 | static int raid1_mergeable_bvec(struct request_queue *q, |
693 | struct bvec_merge_data *bvm, | |
694 | struct bio_vec *biovec) | |
695 | { | |
696 | struct mddev *mddev = q->queuedata; | |
697 | struct r1conf *conf = mddev->private; | |
698 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); | |
699 | int max = biovec->bv_len; | |
700 | ||
701 | if (mddev->merge_check_needed) { | |
702 | int disk; | |
703 | rcu_read_lock(); | |
704 | for (disk = 0; disk < conf->raid_disks * 2; disk++) { | |
705 | struct md_rdev *rdev = rcu_dereference( | |
706 | conf->mirrors[disk].rdev); | |
707 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
708 | struct request_queue *q = | |
709 | bdev_get_queue(rdev->bdev); | |
710 | if (q->merge_bvec_fn) { | |
711 | bvm->bi_sector = sector + | |
712 | rdev->data_offset; | |
713 | bvm->bi_bdev = rdev->bdev; | |
714 | max = min(max, q->merge_bvec_fn( | |
715 | q, bvm, biovec)); | |
716 | } | |
717 | } | |
718 | } | |
719 | rcu_read_unlock(); | |
720 | } | |
721 | return max; | |
722 | ||
723 | } | |
724 | ||
fd01b88c | 725 | int md_raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 726 | { |
e8096360 | 727 | struct r1conf *conf = mddev->private; |
0d129228 N |
728 | int i, ret = 0; |
729 | ||
34db0cd6 N |
730 | if ((bits & (1 << BDI_async_congested)) && |
731 | conf->pending_count >= max_queued_requests) | |
732 | return 1; | |
733 | ||
0d129228 | 734 | rcu_read_lock(); |
f53e29fc | 735 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 736 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 737 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 738 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 739 | |
1ed7242e JB |
740 | BUG_ON(!q); |
741 | ||
0d129228 N |
742 | /* Note the '|| 1' - when read_balance prefers |
743 | * non-congested targets, it can be removed | |
744 | */ | |
91a9e99d | 745 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
746 | ret |= bdi_congested(&q->backing_dev_info, bits); |
747 | else | |
748 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
749 | } | |
750 | } | |
751 | rcu_read_unlock(); | |
752 | return ret; | |
753 | } | |
1ed7242e | 754 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 755 | |
1ed7242e JB |
756 | static int raid1_congested(void *data, int bits) |
757 | { | |
fd01b88c | 758 | struct mddev *mddev = data; |
1ed7242e JB |
759 | |
760 | return mddev_congested(mddev, bits) || | |
761 | md_raid1_congested(mddev, bits); | |
762 | } | |
0d129228 | 763 | |
e8096360 | 764 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
765 | { |
766 | /* Any writes that have been queued but are awaiting | |
767 | * bitmap updates get flushed here. | |
a35e63ef | 768 | */ |
a35e63ef N |
769 | spin_lock_irq(&conf->device_lock); |
770 | ||
771 | if (conf->pending_bio_list.head) { | |
772 | struct bio *bio; | |
773 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 774 | conf->pending_count = 0; |
a35e63ef N |
775 | spin_unlock_irq(&conf->device_lock); |
776 | /* flush any pending bitmap writes to | |
777 | * disk before proceeding w/ I/O */ | |
778 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 779 | wake_up(&conf->wait_barrier); |
a35e63ef N |
780 | |
781 | while (bio) { /* submit pending writes */ | |
782 | struct bio *next = bio->bi_next; | |
783 | bio->bi_next = NULL; | |
2ff8cc2c SL |
784 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
785 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
786 | /* Just ignore it */ | |
787 | bio_endio(bio, 0); | |
788 | else | |
789 | generic_make_request(bio); | |
a35e63ef N |
790 | bio = next; |
791 | } | |
a35e63ef N |
792 | } else |
793 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
794 | } |
795 | ||
17999be4 N |
796 | /* Barriers.... |
797 | * Sometimes we need to suspend IO while we do something else, | |
798 | * either some resync/recovery, or reconfigure the array. | |
799 | * To do this we raise a 'barrier'. | |
800 | * The 'barrier' is a counter that can be raised multiple times | |
801 | * to count how many activities are happening which preclude | |
802 | * normal IO. | |
803 | * We can only raise the barrier if there is no pending IO. | |
804 | * i.e. if nr_pending == 0. | |
805 | * We choose only to raise the barrier if no-one is waiting for the | |
806 | * barrier to go down. This means that as soon as an IO request | |
807 | * is ready, no other operations which require a barrier will start | |
808 | * until the IO request has had a chance. | |
809 | * | |
810 | * So: regular IO calls 'wait_barrier'. When that returns there | |
811 | * is no backgroup IO happening, It must arrange to call | |
812 | * allow_barrier when it has finished its IO. | |
813 | * backgroup IO calls must call raise_barrier. Once that returns | |
814 | * there is no normal IO happeing. It must arrange to call | |
815 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
816 | */ |
817 | #define RESYNC_DEPTH 32 | |
818 | ||
e8096360 | 819 | static void raise_barrier(struct r1conf *conf) |
1da177e4 LT |
820 | { |
821 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
822 | |
823 | /* Wait until no block IO is waiting */ | |
824 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
eed8c02e | 825 | conf->resync_lock); |
17999be4 N |
826 | |
827 | /* block any new IO from starting */ | |
828 | conf->barrier++; | |
829 | ||
046abeed | 830 | /* Now wait for all pending IO to complete */ |
17999be4 N |
831 | wait_event_lock_irq(conf->wait_barrier, |
832 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
eed8c02e | 833 | conf->resync_lock); |
17999be4 N |
834 | |
835 | spin_unlock_irq(&conf->resync_lock); | |
836 | } | |
837 | ||
e8096360 | 838 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
839 | { |
840 | unsigned long flags; | |
709ae487 | 841 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
842 | spin_lock_irqsave(&conf->resync_lock, flags); |
843 | conf->barrier--; | |
844 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
845 | wake_up(&conf->wait_barrier); | |
846 | } | |
847 | ||
e8096360 | 848 | static void wait_barrier(struct r1conf *conf) |
17999be4 N |
849 | { |
850 | spin_lock_irq(&conf->resync_lock); | |
851 | if (conf->barrier) { | |
852 | conf->nr_waiting++; | |
d6b42dcb N |
853 | /* Wait for the barrier to drop. |
854 | * However if there are already pending | |
855 | * requests (preventing the barrier from | |
856 | * rising completely), and the | |
857 | * pre-process bio queue isn't empty, | |
858 | * then don't wait, as we need to empty | |
859 | * that queue to get the nr_pending | |
860 | * count down. | |
861 | */ | |
862 | wait_event_lock_irq(conf->wait_barrier, | |
863 | !conf->barrier || | |
864 | (conf->nr_pending && | |
865 | current->bio_list && | |
866 | !bio_list_empty(current->bio_list)), | |
eed8c02e | 867 | conf->resync_lock); |
17999be4 | 868 | conf->nr_waiting--; |
1da177e4 | 869 | } |
17999be4 | 870 | conf->nr_pending++; |
1da177e4 LT |
871 | spin_unlock_irq(&conf->resync_lock); |
872 | } | |
873 | ||
e8096360 | 874 | static void allow_barrier(struct r1conf *conf) |
17999be4 N |
875 | { |
876 | unsigned long flags; | |
877 | spin_lock_irqsave(&conf->resync_lock, flags); | |
878 | conf->nr_pending--; | |
879 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
880 | wake_up(&conf->wait_barrier); | |
881 | } | |
882 | ||
e8096360 | 883 | static void freeze_array(struct r1conf *conf) |
ddaf22ab N |
884 | { |
885 | /* stop syncio and normal IO and wait for everything to | |
886 | * go quite. | |
887 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
888 | * wait until nr_pending match nr_queued+1 |
889 | * This is called in the context of one normal IO request | |
890 | * that has failed. Thus any sync request that might be pending | |
891 | * will be blocked by nr_pending, and we need to wait for | |
892 | * pending IO requests to complete or be queued for re-try. | |
893 | * Thus the number queued (nr_queued) plus this request (1) | |
894 | * must match the number of pending IOs (nr_pending) before | |
895 | * we continue. | |
ddaf22ab N |
896 | */ |
897 | spin_lock_irq(&conf->resync_lock); | |
898 | conf->barrier++; | |
899 | conf->nr_waiting++; | |
eed8c02e LC |
900 | wait_event_lock_irq_cmd(conf->wait_barrier, |
901 | conf->nr_pending == conf->nr_queued+1, | |
902 | conf->resync_lock, | |
903 | flush_pending_writes(conf)); | |
ddaf22ab N |
904 | spin_unlock_irq(&conf->resync_lock); |
905 | } | |
e8096360 | 906 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
907 | { |
908 | /* reverse the effect of the freeze */ | |
909 | spin_lock_irq(&conf->resync_lock); | |
910 | conf->barrier--; | |
911 | conf->nr_waiting--; | |
912 | wake_up(&conf->wait_barrier); | |
913 | spin_unlock_irq(&conf->resync_lock); | |
914 | } | |
915 | ||
17999be4 | 916 | |
4e78064f | 917 | /* duplicate the data pages for behind I/O |
4e78064f | 918 | */ |
9f2c9d12 | 919 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
920 | { |
921 | int i; | |
922 | struct bio_vec *bvec; | |
2ca68f5e | 923 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 924 | GFP_NOIO); |
2ca68f5e | 925 | if (unlikely(!bvecs)) |
af6d7b76 | 926 | return; |
4b6d287f | 927 | |
4b6d287f | 928 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
929 | bvecs[i] = *bvec; |
930 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
931 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 932 | goto do_sync_io; |
2ca68f5e N |
933 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
934 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
935 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
936 | kunmap(bvec->bv_page); |
937 | } | |
2ca68f5e | 938 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
939 | r1_bio->behind_page_count = bio->bi_vcnt; |
940 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
941 | return; | |
4b6d287f N |
942 | |
943 | do_sync_io: | |
af6d7b76 | 944 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
945 | if (bvecs[i].bv_page) |
946 | put_page(bvecs[i].bv_page); | |
947 | kfree(bvecs); | |
36a4e1fe | 948 | pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
949 | } |
950 | ||
f54a9d0e N |
951 | struct raid1_plug_cb { |
952 | struct blk_plug_cb cb; | |
953 | struct bio_list pending; | |
954 | int pending_cnt; | |
955 | }; | |
956 | ||
957 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
958 | { | |
959 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
960 | cb); | |
961 | struct mddev *mddev = plug->cb.data; | |
962 | struct r1conf *conf = mddev->private; | |
963 | struct bio *bio; | |
964 | ||
874807a8 | 965 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
966 | spin_lock_irq(&conf->device_lock); |
967 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
968 | conf->pending_count += plug->pending_cnt; | |
969 | spin_unlock_irq(&conf->device_lock); | |
970 | md_wakeup_thread(mddev->thread); | |
971 | kfree(plug); | |
972 | return; | |
973 | } | |
974 | ||
975 | /* we aren't scheduling, so we can do the write-out directly. */ | |
976 | bio = bio_list_get(&plug->pending); | |
977 | bitmap_unplug(mddev->bitmap); | |
978 | wake_up(&conf->wait_barrier); | |
979 | ||
980 | while (bio) { /* submit pending writes */ | |
981 | struct bio *next = bio->bi_next; | |
982 | bio->bi_next = NULL; | |
983 | generic_make_request(bio); | |
984 | bio = next; | |
985 | } | |
986 | kfree(plug); | |
987 | } | |
988 | ||
b4fdcb02 | 989 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 990 | { |
e8096360 | 991 | struct r1conf *conf = mddev->private; |
0eaf822c | 992 | struct raid1_info *mirror; |
9f2c9d12 | 993 | struct r1bio *r1_bio; |
1da177e4 | 994 | struct bio *read_bio; |
1f68f0c4 | 995 | int i, disks; |
84255d10 | 996 | struct bitmap *bitmap; |
191ea9b2 | 997 | unsigned long flags; |
a362357b | 998 | const int rw = bio_data_dir(bio); |
2c7d46ec | 999 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 1000 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
2ff8cc2c SL |
1001 | const unsigned long do_discard = (bio->bi_rw |
1002 | & (REQ_DISCARD | REQ_SECURE)); | |
c8dc9c65 | 1003 | const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME); |
3cb03002 | 1004 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1005 | struct blk_plug_cb *cb; |
1006 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 N |
1007 | int first_clone; |
1008 | int sectors_handled; | |
1009 | int max_sectors; | |
191ea9b2 | 1010 | |
1da177e4 LT |
1011 | /* |
1012 | * Register the new request and wait if the reconstruction | |
1013 | * thread has put up a bar for new requests. | |
1014 | * Continue immediately if no resync is active currently. | |
1015 | */ | |
62de608d | 1016 | |
3d310eb7 N |
1017 | md_write_start(mddev, bio); /* wait on superblock update early */ |
1018 | ||
6eef4b21 N |
1019 | if (bio_data_dir(bio) == WRITE && |
1020 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
1021 | bio->bi_sector < mddev->suspend_hi) { | |
1022 | /* As the suspend_* range is controlled by | |
1023 | * userspace, we want an interruptible | |
1024 | * wait. | |
1025 | */ | |
1026 | DEFINE_WAIT(w); | |
1027 | for (;;) { | |
1028 | flush_signals(current); | |
1029 | prepare_to_wait(&conf->wait_barrier, | |
1030 | &w, TASK_INTERRUPTIBLE); | |
1031 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
1032 | bio->bi_sector >= mddev->suspend_hi) | |
1033 | break; | |
1034 | schedule(); | |
1035 | } | |
1036 | finish_wait(&conf->wait_barrier, &w); | |
1037 | } | |
62de608d | 1038 | |
17999be4 | 1039 | wait_barrier(conf); |
1da177e4 | 1040 | |
84255d10 N |
1041 | bitmap = mddev->bitmap; |
1042 | ||
1da177e4 LT |
1043 | /* |
1044 | * make_request() can abort the operation when READA is being | |
1045 | * used and no empty request is available. | |
1046 | * | |
1047 | */ | |
1048 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1049 | ||
1050 | r1_bio->master_bio = bio; | |
1051 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 1052 | r1_bio->state = 0; |
1da177e4 LT |
1053 | r1_bio->mddev = mddev; |
1054 | r1_bio->sector = bio->bi_sector; | |
1055 | ||
d2eb35ac N |
1056 | /* We might need to issue multiple reads to different |
1057 | * devices if there are bad blocks around, so we keep | |
1058 | * track of the number of reads in bio->bi_phys_segments. | |
1059 | * If this is 0, there is only one r1_bio and no locking | |
1060 | * will be needed when requests complete. If it is | |
1061 | * non-zero, then it is the number of not-completed requests. | |
1062 | */ | |
1063 | bio->bi_phys_segments = 0; | |
1064 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
1065 | ||
a362357b | 1066 | if (rw == READ) { |
1da177e4 LT |
1067 | /* |
1068 | * read balancing logic: | |
1069 | */ | |
d2eb35ac N |
1070 | int rdisk; |
1071 | ||
1072 | read_again: | |
1073 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
1074 | |
1075 | if (rdisk < 0) { | |
1076 | /* couldn't find anywhere to read from */ | |
1077 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 1078 | return; |
1da177e4 LT |
1079 | } |
1080 | mirror = conf->mirrors + rdisk; | |
1081 | ||
e555190d N |
1082 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1083 | bitmap) { | |
1084 | /* Reading from a write-mostly device must | |
1085 | * take care not to over-take any writes | |
1086 | * that are 'behind' | |
1087 | */ | |
1088 | wait_event(bitmap->behind_wait, | |
1089 | atomic_read(&bitmap->behind_writes) == 0); | |
1090 | } | |
1da177e4 LT |
1091 | r1_bio->read_disk = rdisk; |
1092 | ||
a167f663 | 1093 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
1094 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
1095 | max_sectors); | |
1da177e4 LT |
1096 | |
1097 | r1_bio->bios[rdisk] = read_bio; | |
1098 | ||
1099 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
1100 | read_bio->bi_bdev = mirror->rdev->bdev; | |
1101 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1102 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1103 | read_bio->bi_private = r1_bio; |
1104 | ||
d2eb35ac N |
1105 | if (max_sectors < r1_bio->sectors) { |
1106 | /* could not read all from this device, so we will | |
1107 | * need another r1_bio. | |
1108 | */ | |
d2eb35ac N |
1109 | |
1110 | sectors_handled = (r1_bio->sector + max_sectors | |
1111 | - bio->bi_sector); | |
1112 | r1_bio->sectors = max_sectors; | |
1113 | spin_lock_irq(&conf->device_lock); | |
1114 | if (bio->bi_phys_segments == 0) | |
1115 | bio->bi_phys_segments = 2; | |
1116 | else | |
1117 | bio->bi_phys_segments++; | |
1118 | spin_unlock_irq(&conf->device_lock); | |
1119 | /* Cannot call generic_make_request directly | |
1120 | * as that will be queued in __make_request | |
1121 | * and subsequent mempool_alloc might block waiting | |
1122 | * for it. So hand bio over to raid1d. | |
1123 | */ | |
1124 | reschedule_retry(r1_bio); | |
1125 | ||
1126 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1127 | ||
1128 | r1_bio->master_bio = bio; | |
1129 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1130 | r1_bio->state = 0; | |
1131 | r1_bio->mddev = mddev; | |
1132 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1133 | goto read_again; | |
1134 | } else | |
1135 | generic_make_request(read_bio); | |
5a7bbad2 | 1136 | return; |
1da177e4 LT |
1137 | } |
1138 | ||
1139 | /* | |
1140 | * WRITE: | |
1141 | */ | |
34db0cd6 N |
1142 | if (conf->pending_count >= max_queued_requests) { |
1143 | md_wakeup_thread(mddev->thread); | |
1144 | wait_event(conf->wait_barrier, | |
1145 | conf->pending_count < max_queued_requests); | |
1146 | } | |
1f68f0c4 | 1147 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1148 | * inc refcount on their rdev. Record them by setting |
1149 | * bios[x] to bio | |
1f68f0c4 N |
1150 | * If there are known/acknowledged bad blocks on any device on |
1151 | * which we have seen a write error, we want to avoid writing those | |
1152 | * blocks. | |
1153 | * This potentially requires several writes to write around | |
1154 | * the bad blocks. Each set of writes gets it's own r1bio | |
1155 | * with a set of bios attached. | |
1da177e4 | 1156 | */ |
c3b328ac | 1157 | |
8f19ccb2 | 1158 | disks = conf->raid_disks * 2; |
6bfe0b49 DW |
1159 | retry_write: |
1160 | blocked_rdev = NULL; | |
1da177e4 | 1161 | rcu_read_lock(); |
1f68f0c4 | 1162 | max_sectors = r1_bio->sectors; |
1da177e4 | 1163 | for (i = 0; i < disks; i++) { |
3cb03002 | 1164 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1165 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1166 | atomic_inc(&rdev->nr_pending); | |
1167 | blocked_rdev = rdev; | |
1168 | break; | |
1169 | } | |
1f68f0c4 | 1170 | r1_bio->bios[i] = NULL; |
6b740b8d N |
1171 | if (!rdev || test_bit(Faulty, &rdev->flags) |
1172 | || test_bit(Unmerged, &rdev->flags)) { | |
8f19ccb2 N |
1173 | if (i < conf->raid_disks) |
1174 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1175 | continue; |
1176 | } | |
1177 | ||
1178 | atomic_inc(&rdev->nr_pending); | |
1179 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1180 | sector_t first_bad; | |
1181 | int bad_sectors; | |
1182 | int is_bad; | |
1183 | ||
1184 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1185 | max_sectors, | |
1186 | &first_bad, &bad_sectors); | |
1187 | if (is_bad < 0) { | |
1188 | /* mustn't write here until the bad block is | |
1189 | * acknowledged*/ | |
1190 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1191 | blocked_rdev = rdev; | |
1192 | break; | |
1193 | } | |
1194 | if (is_bad && first_bad <= r1_bio->sector) { | |
1195 | /* Cannot write here at all */ | |
1196 | bad_sectors -= (r1_bio->sector - first_bad); | |
1197 | if (bad_sectors < max_sectors) | |
1198 | /* mustn't write more than bad_sectors | |
1199 | * to other devices yet | |
1200 | */ | |
1201 | max_sectors = bad_sectors; | |
03c902e1 | 1202 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1203 | /* We don't set R1BIO_Degraded as that |
1204 | * only applies if the disk is | |
1205 | * missing, so it might be re-added, | |
1206 | * and we want to know to recover this | |
1207 | * chunk. | |
1208 | * In this case the device is here, | |
1209 | * and the fact that this chunk is not | |
1210 | * in-sync is recorded in the bad | |
1211 | * block log | |
1212 | */ | |
1213 | continue; | |
964147d5 | 1214 | } |
1f68f0c4 N |
1215 | if (is_bad) { |
1216 | int good_sectors = first_bad - r1_bio->sector; | |
1217 | if (good_sectors < max_sectors) | |
1218 | max_sectors = good_sectors; | |
1219 | } | |
1220 | } | |
1221 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1222 | } |
1223 | rcu_read_unlock(); | |
1224 | ||
6bfe0b49 DW |
1225 | if (unlikely(blocked_rdev)) { |
1226 | /* Wait for this device to become unblocked */ | |
1227 | int j; | |
1228 | ||
1229 | for (j = 0; j < i; j++) | |
1230 | if (r1_bio->bios[j]) | |
1231 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1232 | r1_bio->state = 0; |
6bfe0b49 DW |
1233 | allow_barrier(conf); |
1234 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1235 | wait_barrier(conf); | |
1236 | goto retry_write; | |
1237 | } | |
1238 | ||
1f68f0c4 N |
1239 | if (max_sectors < r1_bio->sectors) { |
1240 | /* We are splitting this write into multiple parts, so | |
1241 | * we need to prepare for allocating another r1_bio. | |
1242 | */ | |
1243 | r1_bio->sectors = max_sectors; | |
1244 | spin_lock_irq(&conf->device_lock); | |
1245 | if (bio->bi_phys_segments == 0) | |
1246 | bio->bi_phys_segments = 2; | |
1247 | else | |
1248 | bio->bi_phys_segments++; | |
1249 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1250 | } |
1f68f0c4 | 1251 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1252 | |
4e78064f | 1253 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1254 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1255 | |
1f68f0c4 | 1256 | first_clone = 1; |
1da177e4 LT |
1257 | for (i = 0; i < disks; i++) { |
1258 | struct bio *mbio; | |
1259 | if (!r1_bio->bios[i]) | |
1260 | continue; | |
1261 | ||
a167f663 | 1262 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1263 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1264 | ||
1265 | if (first_clone) { | |
1266 | /* do behind I/O ? | |
1267 | * Not if there are too many, or cannot | |
1268 | * allocate memory, or a reader on WriteMostly | |
1269 | * is waiting for behind writes to flush */ | |
1270 | if (bitmap && | |
1271 | (atomic_read(&bitmap->behind_writes) | |
1272 | < mddev->bitmap_info.max_write_behind) && | |
1273 | !waitqueue_active(&bitmap->behind_wait)) | |
1274 | alloc_behind_pages(mbio, r1_bio); | |
1275 | ||
1276 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1277 | r1_bio->sectors, | |
1278 | test_bit(R1BIO_BehindIO, | |
1279 | &r1_bio->state)); | |
1280 | first_clone = 0; | |
1281 | } | |
2ca68f5e | 1282 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1283 | struct bio_vec *bvec; |
1284 | int j; | |
1285 | ||
1286 | /* Yes, I really want the '__' version so that | |
1287 | * we clear any unused pointer in the io_vec, rather | |
1288 | * than leave them unchanged. This is important | |
1289 | * because when we come to free the pages, we won't | |
046abeed | 1290 | * know the original bi_idx, so we just free |
4b6d287f N |
1291 | * them all |
1292 | */ | |
1293 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1294 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1295 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1296 | atomic_inc(&r1_bio->behind_remaining); | |
1297 | } | |
1298 | ||
1f68f0c4 N |
1299 | r1_bio->bios[i] = mbio; |
1300 | ||
1301 | mbio->bi_sector = (r1_bio->sector + | |
1302 | conf->mirrors[i].rdev->data_offset); | |
1303 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1304 | mbio->bi_end_io = raid1_end_write_request; | |
c8dc9c65 JL |
1305 | mbio->bi_rw = |
1306 | WRITE | do_flush_fua | do_sync | do_discard | do_same; | |
1f68f0c4 N |
1307 | mbio->bi_private = r1_bio; |
1308 | ||
1da177e4 | 1309 | atomic_inc(&r1_bio->remaining); |
f54a9d0e N |
1310 | |
1311 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); | |
1312 | if (cb) | |
1313 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1314 | else | |
1315 | plug = NULL; | |
4e78064f | 1316 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1317 | if (plug) { |
1318 | bio_list_add(&plug->pending, mbio); | |
1319 | plug->pending_cnt++; | |
1320 | } else { | |
1321 | bio_list_add(&conf->pending_bio_list, mbio); | |
1322 | conf->pending_count++; | |
1323 | } | |
4e78064f | 1324 | spin_unlock_irqrestore(&conf->device_lock, flags); |
f54a9d0e | 1325 | if (!plug) |
b357f04a | 1326 | md_wakeup_thread(mddev->thread); |
1da177e4 | 1327 | } |
079fa166 N |
1328 | /* Mustn't call r1_bio_write_done before this next test, |
1329 | * as it could result in the bio being freed. | |
1330 | */ | |
1f68f0c4 | 1331 | if (sectors_handled < (bio->bi_size >> 9)) { |
079fa166 | 1332 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1333 | /* We need another r1_bio. It has already been counted |
1334 | * in bio->bi_phys_segments | |
1335 | */ | |
1336 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1337 | r1_bio->master_bio = bio; | |
1338 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1339 | r1_bio->state = 0; | |
1340 | r1_bio->mddev = mddev; | |
1341 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1342 | goto retry_write; | |
1343 | } | |
1344 | ||
079fa166 N |
1345 | r1_bio_write_done(r1_bio); |
1346 | ||
1347 | /* In case raid1d snuck in to freeze_array */ | |
1348 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1349 | } |
1350 | ||
fd01b88c | 1351 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1352 | { |
e8096360 | 1353 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1354 | int i; |
1355 | ||
1356 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1357 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1358 | rcu_read_lock(); |
1359 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1360 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1361 | seq_printf(seq, "%s", |
ddac7c7e N |
1362 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1363 | } | |
1364 | rcu_read_unlock(); | |
1da177e4 LT |
1365 | seq_printf(seq, "]"); |
1366 | } | |
1367 | ||
1368 | ||
fd01b88c | 1369 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1370 | { |
1371 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1372 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1373 | |
1374 | /* | |
1375 | * If it is not operational, then we have already marked it as dead | |
1376 | * else if it is the last working disks, ignore the error, let the | |
1377 | * next level up know. | |
1378 | * else mark the drive as failed | |
1379 | */ | |
b2d444d7 | 1380 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1381 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1382 | /* |
1383 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1384 | * normal single drive. |
1385 | * However don't try a recovery from this drive as | |
1386 | * it is very likely to fail. | |
1da177e4 | 1387 | */ |
5389042f | 1388 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1389 | return; |
4044ba58 | 1390 | } |
de393cde | 1391 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1392 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1393 | unsigned long flags; | |
1394 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1395 | mddev->degraded++; |
dd00a99e | 1396 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1397 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1398 | /* |
1399 | * if recovery is running, make sure it aborts. | |
1400 | */ | |
dfc70645 | 1401 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1402 | } else |
1403 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1404 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1405 | printk(KERN_ALERT |
1406 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1407 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1408 | mdname(mddev), bdevname(rdev->bdev, b), |
1409 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1410 | } |
1411 | ||
e8096360 | 1412 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1413 | { |
1414 | int i; | |
1da177e4 | 1415 | |
9dd1e2fa | 1416 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1417 | if (!conf) { |
9dd1e2fa | 1418 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1419 | return; |
1420 | } | |
9dd1e2fa | 1421 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1422 | conf->raid_disks); |
1423 | ||
ddac7c7e | 1424 | rcu_read_lock(); |
1da177e4 LT |
1425 | for (i = 0; i < conf->raid_disks; i++) { |
1426 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1427 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1428 | if (rdev) |
9dd1e2fa | 1429 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1430 | i, !test_bit(In_sync, &rdev->flags), |
1431 | !test_bit(Faulty, &rdev->flags), | |
1432 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1433 | } |
ddac7c7e | 1434 | rcu_read_unlock(); |
1da177e4 LT |
1435 | } |
1436 | ||
e8096360 | 1437 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1438 | { |
17999be4 N |
1439 | wait_barrier(conf); |
1440 | allow_barrier(conf); | |
1da177e4 LT |
1441 | |
1442 | mempool_destroy(conf->r1buf_pool); | |
1443 | conf->r1buf_pool = NULL; | |
1444 | } | |
1445 | ||
fd01b88c | 1446 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1447 | { |
1448 | int i; | |
e8096360 | 1449 | struct r1conf *conf = mddev->private; |
6b965620 N |
1450 | int count = 0; |
1451 | unsigned long flags; | |
1da177e4 LT |
1452 | |
1453 | /* | |
1454 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1455 | * and mark them readable. |
1456 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1457 | */ |
1458 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1459 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1460 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1461 | if (repl | |
1462 | && repl->recovery_offset == MaxSector | |
1463 | && !test_bit(Faulty, &repl->flags) | |
1464 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1465 | /* replacement has just become active */ | |
1466 | if (!rdev || | |
1467 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1468 | count++; | |
1469 | if (rdev) { | |
1470 | /* Replaced device not technically | |
1471 | * faulty, but we need to be sure | |
1472 | * it gets removed and never re-added | |
1473 | */ | |
1474 | set_bit(Faulty, &rdev->flags); | |
1475 | sysfs_notify_dirent_safe( | |
1476 | rdev->sysfs_state); | |
1477 | } | |
1478 | } | |
ddac7c7e N |
1479 | if (rdev |
1480 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1481 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1482 | count++; |
654e8b5a | 1483 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1484 | } |
1485 | } | |
6b965620 N |
1486 | spin_lock_irqsave(&conf->device_lock, flags); |
1487 | mddev->degraded -= count; | |
1488 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1489 | |
1490 | print_conf(conf); | |
6b965620 | 1491 | return count; |
1da177e4 LT |
1492 | } |
1493 | ||
1494 | ||
fd01b88c | 1495 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1496 | { |
e8096360 | 1497 | struct r1conf *conf = mddev->private; |
199050ea | 1498 | int err = -EEXIST; |
41158c7e | 1499 | int mirror = 0; |
0eaf822c | 1500 | struct raid1_info *p; |
6c2fce2e | 1501 | int first = 0; |
30194636 | 1502 | int last = conf->raid_disks - 1; |
6b740b8d | 1503 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
1da177e4 | 1504 | |
5389042f N |
1505 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1506 | return -EBUSY; | |
1507 | ||
6c2fce2e NB |
1508 | if (rdev->raid_disk >= 0) |
1509 | first = last = rdev->raid_disk; | |
1510 | ||
6b740b8d N |
1511 | if (q->merge_bvec_fn) { |
1512 | set_bit(Unmerged, &rdev->flags); | |
1513 | mddev->merge_check_needed = 1; | |
1514 | } | |
1515 | ||
7ef449d1 N |
1516 | for (mirror = first; mirror <= last; mirror++) { |
1517 | p = conf->mirrors+mirror; | |
1518 | if (!p->rdev) { | |
1da177e4 | 1519 | |
8f6c2e4b MP |
1520 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1521 | rdev->data_offset << 9); | |
1da177e4 LT |
1522 | |
1523 | p->head_position = 0; | |
1524 | rdev->raid_disk = mirror; | |
199050ea | 1525 | err = 0; |
6aea114a N |
1526 | /* As all devices are equivalent, we don't need a full recovery |
1527 | * if this was recently any drive of the array | |
1528 | */ | |
1529 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1530 | conf->fullsync = 1; |
d6065f7b | 1531 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1532 | break; |
1533 | } | |
7ef449d1 N |
1534 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1535 | p[conf->raid_disks].rdev == NULL) { | |
1536 | /* Add this device as a replacement */ | |
1537 | clear_bit(In_sync, &rdev->flags); | |
1538 | set_bit(Replacement, &rdev->flags); | |
1539 | rdev->raid_disk = mirror; | |
1540 | err = 0; | |
1541 | conf->fullsync = 1; | |
1542 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1543 | break; | |
1544 | } | |
1545 | } | |
6b740b8d N |
1546 | if (err == 0 && test_bit(Unmerged, &rdev->flags)) { |
1547 | /* Some requests might not have seen this new | |
1548 | * merge_bvec_fn. We must wait for them to complete | |
1549 | * before merging the device fully. | |
1550 | * First we make sure any code which has tested | |
1551 | * our function has submitted the request, then | |
1552 | * we wait for all outstanding requests to complete. | |
1553 | */ | |
1554 | synchronize_sched(); | |
1555 | raise_barrier(conf); | |
1556 | lower_barrier(conf); | |
1557 | clear_bit(Unmerged, &rdev->flags); | |
1558 | } | |
ac5e7113 | 1559 | md_integrity_add_rdev(rdev, mddev); |
2ff8cc2c SL |
1560 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
1561 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); | |
1da177e4 | 1562 | print_conf(conf); |
199050ea | 1563 | return err; |
1da177e4 LT |
1564 | } |
1565 | ||
b8321b68 | 1566 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1567 | { |
e8096360 | 1568 | struct r1conf *conf = mddev->private; |
1da177e4 | 1569 | int err = 0; |
b8321b68 | 1570 | int number = rdev->raid_disk; |
0eaf822c | 1571 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1572 | |
b014f14c N |
1573 | if (rdev != p->rdev) |
1574 | p = conf->mirrors + conf->raid_disks + number; | |
1575 | ||
1da177e4 | 1576 | print_conf(conf); |
b8321b68 | 1577 | if (rdev == p->rdev) { |
b2d444d7 | 1578 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1579 | atomic_read(&rdev->nr_pending)) { |
1580 | err = -EBUSY; | |
1581 | goto abort; | |
1582 | } | |
046abeed | 1583 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1584 | * is not possible. |
1585 | */ | |
1586 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1587 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1588 | mddev->degraded < conf->raid_disks) { |
1589 | err = -EBUSY; | |
1590 | goto abort; | |
1591 | } | |
1da177e4 | 1592 | p->rdev = NULL; |
fbd568a3 | 1593 | synchronize_rcu(); |
1da177e4 LT |
1594 | if (atomic_read(&rdev->nr_pending)) { |
1595 | /* lost the race, try later */ | |
1596 | err = -EBUSY; | |
1597 | p->rdev = rdev; | |
ac5e7113 | 1598 | goto abort; |
8c7a2c2b N |
1599 | } else if (conf->mirrors[conf->raid_disks + number].rdev) { |
1600 | /* We just removed a device that is being replaced. | |
1601 | * Move down the replacement. We drain all IO before | |
1602 | * doing this to avoid confusion. | |
1603 | */ | |
1604 | struct md_rdev *repl = | |
1605 | conf->mirrors[conf->raid_disks + number].rdev; | |
1606 | raise_barrier(conf); | |
1607 | clear_bit(Replacement, &repl->flags); | |
1608 | p->rdev = repl; | |
1609 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
1610 | lower_barrier(conf); | |
1611 | clear_bit(WantReplacement, &rdev->flags); | |
1612 | } else | |
b014f14c | 1613 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1614 | err = md_integrity_register(mddev); |
1da177e4 LT |
1615 | } |
1616 | abort: | |
1617 | ||
1618 | print_conf(conf); | |
1619 | return err; | |
1620 | } | |
1621 | ||
1622 | ||
6712ecf8 | 1623 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1624 | { |
9f2c9d12 | 1625 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1626 | |
0fc280f6 | 1627 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1628 | |
1da177e4 LT |
1629 | /* |
1630 | * we have read a block, now it needs to be re-written, | |
1631 | * or re-read if the read failed. | |
1632 | * We don't do much here, just schedule handling by raid1d | |
1633 | */ | |
69382e85 | 1634 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1635 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1636 | |
1637 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1638 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1639 | } |
1640 | ||
6712ecf8 | 1641 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1642 | { |
1643 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1644 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1645 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1646 | struct r1conf *conf = mddev->private; |
1da177e4 | 1647 | int mirror=0; |
4367af55 N |
1648 | sector_t first_bad; |
1649 | int bad_sectors; | |
1da177e4 | 1650 | |
ba3ae3be NK |
1651 | mirror = find_bio_disk(r1_bio, bio); |
1652 | ||
6b1117d5 | 1653 | if (!uptodate) { |
57dab0bd | 1654 | sector_t sync_blocks = 0; |
6b1117d5 N |
1655 | sector_t s = r1_bio->sector; |
1656 | long sectors_to_go = r1_bio->sectors; | |
1657 | /* make sure these bits doesn't get cleared. */ | |
1658 | do { | |
5e3db645 | 1659 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1660 | &sync_blocks, 1); |
1661 | s += sync_blocks; | |
1662 | sectors_to_go -= sync_blocks; | |
1663 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1664 | set_bit(WriteErrorSeen, |
1665 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
1666 | if (!test_and_set_bit(WantReplacement, |
1667 | &conf->mirrors[mirror].rdev->flags)) | |
1668 | set_bit(MD_RECOVERY_NEEDED, & | |
1669 | mddev->recovery); | |
d8f05d29 | 1670 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 N |
1671 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1672 | r1_bio->sector, | |
1673 | r1_bio->sectors, | |
3a9f28a5 N |
1674 | &first_bad, &bad_sectors) && |
1675 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1676 | r1_bio->sector, | |
1677 | r1_bio->sectors, | |
1678 | &first_bad, &bad_sectors) | |
1679 | ) | |
4367af55 | 1680 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1681 | |
1da177e4 | 1682 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1683 | int s = r1_bio->sectors; |
d8f05d29 N |
1684 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1685 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1686 | reschedule_retry(r1_bio); |
1687 | else { | |
1688 | put_buf(r1_bio); | |
1689 | md_done_sync(mddev, s, uptodate); | |
1690 | } | |
1da177e4 | 1691 | } |
1da177e4 LT |
1692 | } |
1693 | ||
3cb03002 | 1694 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1695 | int sectors, struct page *page, int rw) |
1696 | { | |
1697 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1698 | /* success */ | |
1699 | return 1; | |
19d67169 | 1700 | if (rw == WRITE) { |
d8f05d29 | 1701 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1702 | if (!test_and_set_bit(WantReplacement, |
1703 | &rdev->flags)) | |
1704 | set_bit(MD_RECOVERY_NEEDED, & | |
1705 | rdev->mddev->recovery); | |
1706 | } | |
d8f05d29 N |
1707 | /* need to record an error - either for the block or the device */ |
1708 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1709 | md_error(rdev->mddev, rdev); | |
1710 | return 0; | |
1711 | } | |
1712 | ||
9f2c9d12 | 1713 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1714 | { |
a68e5870 N |
1715 | /* Try some synchronous reads of other devices to get |
1716 | * good data, much like with normal read errors. Only | |
1717 | * read into the pages we already have so we don't | |
1718 | * need to re-issue the read request. | |
1719 | * We don't need to freeze the array, because being in an | |
1720 | * active sync request, there is no normal IO, and | |
1721 | * no overlapping syncs. | |
06f60385 N |
1722 | * We don't need to check is_badblock() again as we |
1723 | * made sure that anything with a bad block in range | |
1724 | * will have bi_end_io clear. | |
a68e5870 | 1725 | */ |
fd01b88c | 1726 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1727 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1728 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1729 | sector_t sect = r1_bio->sector; | |
1730 | int sectors = r1_bio->sectors; | |
1731 | int idx = 0; | |
1732 | ||
1733 | while(sectors) { | |
1734 | int s = sectors; | |
1735 | int d = r1_bio->read_disk; | |
1736 | int success = 0; | |
3cb03002 | 1737 | struct md_rdev *rdev; |
78d7f5f7 | 1738 | int start; |
a68e5870 N |
1739 | |
1740 | if (s > (PAGE_SIZE>>9)) | |
1741 | s = PAGE_SIZE >> 9; | |
1742 | do { | |
1743 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1744 | /* No rcu protection needed here devices | |
1745 | * can only be removed when no resync is | |
1746 | * active, and resync is currently active | |
1747 | */ | |
1748 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1749 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1750 | bio->bi_io_vec[idx].bv_page, |
1751 | READ, false)) { | |
1752 | success = 1; | |
1753 | break; | |
1754 | } | |
1755 | } | |
1756 | d++; | |
8f19ccb2 | 1757 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1758 | d = 0; |
1759 | } while (!success && d != r1_bio->read_disk); | |
1760 | ||
78d7f5f7 | 1761 | if (!success) { |
a68e5870 | 1762 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1763 | int abort = 0; |
1764 | /* Cannot read from anywhere, this block is lost. | |
1765 | * Record a bad block on each device. If that doesn't | |
1766 | * work just disable and interrupt the recovery. | |
1767 | * Don't fail devices as that won't really help. | |
1768 | */ | |
a68e5870 N |
1769 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1770 | " for block %llu\n", | |
1771 | mdname(mddev), | |
1772 | bdevname(bio->bi_bdev, b), | |
1773 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 1774 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1775 | rdev = conf->mirrors[d].rdev; |
1776 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1777 | continue; | |
1778 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1779 | abort = 1; | |
1780 | } | |
1781 | if (abort) { | |
d890fa2b N |
1782 | conf->recovery_disabled = |
1783 | mddev->recovery_disabled; | |
3a9f28a5 N |
1784 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1785 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1786 | put_buf(r1_bio); | |
1787 | return 0; | |
1788 | } | |
1789 | /* Try next page */ | |
1790 | sectors -= s; | |
1791 | sect += s; | |
1792 | idx++; | |
1793 | continue; | |
d11c171e | 1794 | } |
78d7f5f7 N |
1795 | |
1796 | start = d; | |
1797 | /* write it back and re-read */ | |
1798 | while (d != r1_bio->read_disk) { | |
1799 | if (d == 0) | |
8f19ccb2 | 1800 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1801 | d--; |
1802 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1803 | continue; | |
1804 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1805 | if (r1_sync_page_io(rdev, sect, s, |
1806 | bio->bi_io_vec[idx].bv_page, | |
1807 | WRITE) == 0) { | |
78d7f5f7 N |
1808 | r1_bio->bios[d]->bi_end_io = NULL; |
1809 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1810 | } |
78d7f5f7 N |
1811 | } |
1812 | d = start; | |
1813 | while (d != r1_bio->read_disk) { | |
1814 | if (d == 0) | |
8f19ccb2 | 1815 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1816 | d--; |
1817 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1818 | continue; | |
1819 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1820 | if (r1_sync_page_io(rdev, sect, s, |
1821 | bio->bi_io_vec[idx].bv_page, | |
1822 | READ) != 0) | |
9d3d8011 | 1823 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1824 | } |
a68e5870 N |
1825 | sectors -= s; |
1826 | sect += s; | |
1827 | idx ++; | |
1828 | } | |
78d7f5f7 | 1829 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1830 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1831 | return 1; |
1832 | } | |
1833 | ||
9f2c9d12 | 1834 | static int process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1835 | { |
1836 | /* We have read all readable devices. If we haven't | |
1837 | * got the block, then there is no hope left. | |
1838 | * If we have, then we want to do a comparison | |
1839 | * and skip the write if everything is the same. | |
1840 | * If any blocks failed to read, then we need to | |
1841 | * attempt an over-write | |
1842 | */ | |
fd01b88c | 1843 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1844 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1845 | int primary; |
1846 | int i; | |
f4380a91 | 1847 | int vcnt; |
a68e5870 | 1848 | |
8f19ccb2 | 1849 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 N |
1850 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1851 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1852 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1853 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1854 | break; | |
1855 | } | |
1856 | r1_bio->read_disk = primary; | |
f4380a91 | 1857 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); |
8f19ccb2 | 1858 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 1859 | int j; |
78d7f5f7 N |
1860 | struct bio *pbio = r1_bio->bios[primary]; |
1861 | struct bio *sbio = r1_bio->bios[i]; | |
1862 | int size; | |
a68e5870 | 1863 | |
78d7f5f7 N |
1864 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1865 | continue; | |
1866 | ||
1867 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1868 | for (j = vcnt; j-- ; ) { | |
1869 | struct page *p, *s; | |
1870 | p = pbio->bi_io_vec[j].bv_page; | |
1871 | s = sbio->bi_io_vec[j].bv_page; | |
1872 | if (memcmp(page_address(p), | |
1873 | page_address(s), | |
5020ad7d | 1874 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 1875 | break; |
69382e85 | 1876 | } |
78d7f5f7 N |
1877 | } else |
1878 | j = 0; | |
1879 | if (j >= 0) | |
7f7583d4 | 1880 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 N |
1881 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1882 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1883 | /* No need to write to this device. */ | |
1884 | sbio->bi_end_io = NULL; | |
1885 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1886 | continue; | |
1887 | } | |
1888 | /* fixup the bio for reuse */ | |
1889 | sbio->bi_vcnt = vcnt; | |
1890 | sbio->bi_size = r1_bio->sectors << 9; | |
1891 | sbio->bi_idx = 0; | |
1892 | sbio->bi_phys_segments = 0; | |
1893 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1894 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1895 | sbio->bi_next = NULL; | |
1896 | sbio->bi_sector = r1_bio->sector + | |
1897 | conf->mirrors[i].rdev->data_offset; | |
1898 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1899 | size = sbio->bi_size; | |
1900 | for (j = 0; j < vcnt ; j++) { | |
1901 | struct bio_vec *bi; | |
1902 | bi = &sbio->bi_io_vec[j]; | |
1903 | bi->bv_offset = 0; | |
1904 | if (size > PAGE_SIZE) | |
1905 | bi->bv_len = PAGE_SIZE; | |
1906 | else | |
1907 | bi->bv_len = size; | |
1908 | size -= PAGE_SIZE; | |
1909 | memcpy(page_address(bi->bv_page), | |
1910 | page_address(pbio->bi_io_vec[j].bv_page), | |
1911 | PAGE_SIZE); | |
69382e85 | 1912 | } |
78d7f5f7 | 1913 | } |
a68e5870 N |
1914 | return 0; |
1915 | } | |
1916 | ||
9f2c9d12 | 1917 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 1918 | { |
e8096360 | 1919 | struct r1conf *conf = mddev->private; |
a68e5870 | 1920 | int i; |
8f19ccb2 | 1921 | int disks = conf->raid_disks * 2; |
a68e5870 N |
1922 | struct bio *bio, *wbio; |
1923 | ||
1924 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1925 | ||
a68e5870 N |
1926 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1927 | /* ouch - failed to read all of that. */ | |
1928 | if (!fix_sync_read_error(r1_bio)) | |
1929 | return; | |
7ca78d57 N |
1930 | |
1931 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1932 | if (process_checks(r1_bio) < 0) | |
1933 | return; | |
d11c171e N |
1934 | /* |
1935 | * schedule writes | |
1936 | */ | |
1da177e4 LT |
1937 | atomic_set(&r1_bio->remaining, 1); |
1938 | for (i = 0; i < disks ; i++) { | |
1939 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1940 | if (wbio->bi_end_io == NULL || |
1941 | (wbio->bi_end_io == end_sync_read && | |
1942 | (i == r1_bio->read_disk || | |
1943 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1944 | continue; |
1945 | ||
3e198f78 N |
1946 | wbio->bi_rw = WRITE; |
1947 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1948 | atomic_inc(&r1_bio->remaining); |
1949 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1950 | |
1da177e4 LT |
1951 | generic_make_request(wbio); |
1952 | } | |
1953 | ||
1954 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1955 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
1956 | int s = r1_bio->sectors; |
1957 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
1958 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
1959 | reschedule_retry(r1_bio); | |
1960 | else { | |
1961 | put_buf(r1_bio); | |
1962 | md_done_sync(mddev, s, 1); | |
1963 | } | |
1da177e4 LT |
1964 | } |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * This is a kernel thread which: | |
1969 | * | |
1970 | * 1. Retries failed read operations on working mirrors. | |
1971 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1972 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1973 | */ |
1974 | ||
e8096360 | 1975 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
1976 | sector_t sect, int sectors) |
1977 | { | |
fd01b88c | 1978 | struct mddev *mddev = conf->mddev; |
867868fb N |
1979 | while(sectors) { |
1980 | int s = sectors; | |
1981 | int d = read_disk; | |
1982 | int success = 0; | |
1983 | int start; | |
3cb03002 | 1984 | struct md_rdev *rdev; |
867868fb N |
1985 | |
1986 | if (s > (PAGE_SIZE>>9)) | |
1987 | s = PAGE_SIZE >> 9; | |
1988 | ||
1989 | do { | |
1990 | /* Note: no rcu protection needed here | |
1991 | * as this is synchronous in the raid1d thread | |
1992 | * which is the thread that might remove | |
1993 | * a device. If raid1d ever becomes multi-threaded.... | |
1994 | */ | |
d2eb35ac N |
1995 | sector_t first_bad; |
1996 | int bad_sectors; | |
1997 | ||
867868fb N |
1998 | rdev = conf->mirrors[d].rdev; |
1999 | if (rdev && | |
da8840a7 | 2000 | (test_bit(In_sync, &rdev->flags) || |
2001 | (!test_bit(Faulty, &rdev->flags) && | |
2002 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac N |
2003 | is_badblock(rdev, sect, s, |
2004 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
2005 | sync_page_io(rdev, sect, s<<9, |
2006 | conf->tmppage, READ, false)) | |
867868fb N |
2007 | success = 1; |
2008 | else { | |
2009 | d++; | |
8f19ccb2 | 2010 | if (d == conf->raid_disks * 2) |
867868fb N |
2011 | d = 0; |
2012 | } | |
2013 | } while (!success && d != read_disk); | |
2014 | ||
2015 | if (!success) { | |
d8f05d29 | 2016 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2017 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2018 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2019 | md_error(mddev, rdev); | |
867868fb N |
2020 | break; |
2021 | } | |
2022 | /* write it back and re-read */ | |
2023 | start = d; | |
2024 | while (d != read_disk) { | |
2025 | if (d==0) | |
8f19ccb2 | 2026 | d = conf->raid_disks * 2; |
867868fb N |
2027 | d--; |
2028 | rdev = conf->mirrors[d].rdev; | |
2029 | if (rdev && | |
d8f05d29 N |
2030 | test_bit(In_sync, &rdev->flags)) |
2031 | r1_sync_page_io(rdev, sect, s, | |
2032 | conf->tmppage, WRITE); | |
867868fb N |
2033 | } |
2034 | d = start; | |
2035 | while (d != read_disk) { | |
2036 | char b[BDEVNAME_SIZE]; | |
2037 | if (d==0) | |
8f19ccb2 | 2038 | d = conf->raid_disks * 2; |
867868fb N |
2039 | d--; |
2040 | rdev = conf->mirrors[d].rdev; | |
2041 | if (rdev && | |
2042 | test_bit(In_sync, &rdev->flags)) { | |
d8f05d29 N |
2043 | if (r1_sync_page_io(rdev, sect, s, |
2044 | conf->tmppage, READ)) { | |
867868fb N |
2045 | atomic_add(s, &rdev->corrected_errors); |
2046 | printk(KERN_INFO | |
9dd1e2fa | 2047 | "md/raid1:%s: read error corrected " |
867868fb N |
2048 | "(%d sectors at %llu on %s)\n", |
2049 | mdname(mddev), s, | |
969b755a RD |
2050 | (unsigned long long)(sect + |
2051 | rdev->data_offset), | |
867868fb N |
2052 | bdevname(rdev->bdev, b)); |
2053 | } | |
2054 | } | |
2055 | } | |
2056 | sectors -= s; | |
2057 | sect += s; | |
2058 | } | |
2059 | } | |
2060 | ||
cd5ff9a1 N |
2061 | static void bi_complete(struct bio *bio, int error) |
2062 | { | |
2063 | complete((struct completion *)bio->bi_private); | |
2064 | } | |
2065 | ||
2066 | static int submit_bio_wait(int rw, struct bio *bio) | |
2067 | { | |
2068 | struct completion event; | |
2069 | rw |= REQ_SYNC; | |
2070 | ||
2071 | init_completion(&event); | |
2072 | bio->bi_private = &event; | |
2073 | bio->bi_end_io = bi_complete; | |
2074 | submit_bio(rw, bio); | |
2075 | wait_for_completion(&event); | |
2076 | ||
2077 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
2078 | } | |
2079 | ||
9f2c9d12 | 2080 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2081 | { |
fd01b88c | 2082 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2083 | struct r1conf *conf = mddev->private; |
3cb03002 | 2084 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2085 | int vcnt, idx; |
2086 | struct bio_vec *vec; | |
2087 | ||
2088 | /* bio has the data to be written to device 'i' where | |
2089 | * we just recently had a write error. | |
2090 | * We repeatedly clone the bio and trim down to one block, | |
2091 | * then try the write. Where the write fails we record | |
2092 | * a bad block. | |
2093 | * It is conceivable that the bio doesn't exactly align with | |
2094 | * blocks. We must handle this somehow. | |
2095 | * | |
2096 | * We currently own a reference on the rdev. | |
2097 | */ | |
2098 | ||
2099 | int block_sectors; | |
2100 | sector_t sector; | |
2101 | int sectors; | |
2102 | int sect_to_write = r1_bio->sectors; | |
2103 | int ok = 1; | |
2104 | ||
2105 | if (rdev->badblocks.shift < 0) | |
2106 | return 0; | |
2107 | ||
2108 | block_sectors = 1 << rdev->badblocks.shift; | |
2109 | sector = r1_bio->sector; | |
2110 | sectors = ((sector + block_sectors) | |
2111 | & ~(sector_t)(block_sectors - 1)) | |
2112 | - sector; | |
2113 | ||
2114 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
2115 | vcnt = r1_bio->behind_page_count; | |
2116 | vec = r1_bio->behind_bvecs; | |
2117 | idx = 0; | |
2118 | while (vec[idx].bv_page == NULL) | |
2119 | idx++; | |
2120 | } else { | |
2121 | vcnt = r1_bio->master_bio->bi_vcnt; | |
2122 | vec = r1_bio->master_bio->bi_io_vec; | |
2123 | idx = r1_bio->master_bio->bi_idx; | |
2124 | } | |
2125 | while (sect_to_write) { | |
2126 | struct bio *wbio; | |
2127 | if (sectors > sect_to_write) | |
2128 | sectors = sect_to_write; | |
2129 | /* Write at 'sector' for 'sectors'*/ | |
2130 | ||
2131 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2132 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2133 | wbio->bi_sector = r1_bio->sector; | |
2134 | wbio->bi_rw = WRITE; | |
2135 | wbio->bi_vcnt = vcnt; | |
2136 | wbio->bi_size = r1_bio->sectors << 9; | |
2137 | wbio->bi_idx = idx; | |
2138 | ||
2139 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
2140 | wbio->bi_sector += rdev->data_offset; | |
2141 | wbio->bi_bdev = rdev->bdev; | |
2142 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2143 | /* failure! */ | |
2144 | ok = rdev_set_badblocks(rdev, sector, | |
2145 | sectors, 0) | |
2146 | && ok; | |
2147 | ||
2148 | bio_put(wbio); | |
2149 | sect_to_write -= sectors; | |
2150 | sector += sectors; | |
2151 | sectors = block_sectors; | |
2152 | } | |
2153 | return ok; | |
2154 | } | |
2155 | ||
e8096360 | 2156 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2157 | { |
2158 | int m; | |
2159 | int s = r1_bio->sectors; | |
8f19ccb2 | 2160 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2161 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2162 | struct bio *bio = r1_bio->bios[m]; |
2163 | if (bio->bi_end_io == NULL) | |
2164 | continue; | |
2165 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2166 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
c6563a8c | 2167 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce N |
2168 | } |
2169 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2170 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
2171 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2172 | md_error(conf->mddev, rdev); | |
2173 | } | |
2174 | } | |
2175 | put_buf(r1_bio); | |
2176 | md_done_sync(conf->mddev, s, 1); | |
2177 | } | |
2178 | ||
e8096360 | 2179 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2180 | { |
2181 | int m; | |
8f19ccb2 | 2182 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2183 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2184 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2185 | rdev_clear_badblocks(rdev, |
2186 | r1_bio->sector, | |
c6563a8c | 2187 | r1_bio->sectors, 0); |
62096bce N |
2188 | rdev_dec_pending(rdev, conf->mddev); |
2189 | } else if (r1_bio->bios[m] != NULL) { | |
2190 | /* This drive got a write error. We need to | |
2191 | * narrow down and record precise write | |
2192 | * errors. | |
2193 | */ | |
2194 | if (!narrow_write_error(r1_bio, m)) { | |
2195 | md_error(conf->mddev, | |
2196 | conf->mirrors[m].rdev); | |
2197 | /* an I/O failed, we can't clear the bitmap */ | |
2198 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2199 | } | |
2200 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2201 | conf->mddev); | |
2202 | } | |
2203 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2204 | close_write(r1_bio); | |
2205 | raid_end_bio_io(r1_bio); | |
2206 | } | |
2207 | ||
e8096360 | 2208 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2209 | { |
2210 | int disk; | |
2211 | int max_sectors; | |
fd01b88c | 2212 | struct mddev *mddev = conf->mddev; |
62096bce N |
2213 | struct bio *bio; |
2214 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2215 | struct md_rdev *rdev; |
62096bce N |
2216 | |
2217 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2218 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2219 | * the block and we can fix it. | |
2220 | * We freeze all other IO, and try reading the block from | |
2221 | * other devices. When we find one, we re-write | |
2222 | * and check it that fixes the read error. | |
2223 | * This is all done synchronously while the array is | |
2224 | * frozen | |
2225 | */ | |
2226 | if (mddev->ro == 0) { | |
2227 | freeze_array(conf); | |
2228 | fix_read_error(conf, r1_bio->read_disk, | |
2229 | r1_bio->sector, r1_bio->sectors); | |
2230 | unfreeze_array(conf); | |
2231 | } else | |
2232 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
7ad4d4a6 | 2233 | rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); |
62096bce N |
2234 | |
2235 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2236 | bdevname(bio->bi_bdev, b); | |
2237 | read_more: | |
2238 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2239 | if (disk == -1) { | |
2240 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
2241 | " read error for block %llu\n", | |
2242 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
2243 | raid_end_bio_io(r1_bio); | |
2244 | } else { | |
2245 | const unsigned long do_sync | |
2246 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
2247 | if (bio) { | |
2248 | r1_bio->bios[r1_bio->read_disk] = | |
2249 | mddev->ro ? IO_BLOCKED : NULL; | |
2250 | bio_put(bio); | |
2251 | } | |
2252 | r1_bio->read_disk = disk; | |
2253 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2254 | md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); | |
2255 | r1_bio->bios[r1_bio->read_disk] = bio; | |
2256 | rdev = conf->mirrors[disk].rdev; | |
2257 | printk_ratelimited(KERN_ERR | |
2258 | "md/raid1:%s: redirecting sector %llu" | |
2259 | " to other mirror: %s\n", | |
2260 | mdname(mddev), | |
2261 | (unsigned long long)r1_bio->sector, | |
2262 | bdevname(rdev->bdev, b)); | |
2263 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
2264 | bio->bi_bdev = rdev->bdev; | |
2265 | bio->bi_end_io = raid1_end_read_request; | |
2266 | bio->bi_rw = READ | do_sync; | |
2267 | bio->bi_private = r1_bio; | |
2268 | if (max_sectors < r1_bio->sectors) { | |
2269 | /* Drat - have to split this up more */ | |
2270 | struct bio *mbio = r1_bio->master_bio; | |
2271 | int sectors_handled = (r1_bio->sector + max_sectors | |
2272 | - mbio->bi_sector); | |
2273 | r1_bio->sectors = max_sectors; | |
2274 | spin_lock_irq(&conf->device_lock); | |
2275 | if (mbio->bi_phys_segments == 0) | |
2276 | mbio->bi_phys_segments = 2; | |
2277 | else | |
2278 | mbio->bi_phys_segments++; | |
2279 | spin_unlock_irq(&conf->device_lock); | |
2280 | generic_make_request(bio); | |
2281 | bio = NULL; | |
2282 | ||
2283 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2284 | ||
2285 | r1_bio->master_bio = mbio; | |
2286 | r1_bio->sectors = (mbio->bi_size >> 9) | |
2287 | - sectors_handled; | |
2288 | r1_bio->state = 0; | |
2289 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2290 | r1_bio->mddev = mddev; | |
2291 | r1_bio->sector = mbio->bi_sector + sectors_handled; | |
2292 | ||
2293 | goto read_more; | |
2294 | } else | |
2295 | generic_make_request(bio); | |
2296 | } | |
2297 | } | |
2298 | ||
4ed8731d | 2299 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2300 | { |
4ed8731d | 2301 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2302 | struct r1bio *r1_bio; |
1da177e4 | 2303 | unsigned long flags; |
e8096360 | 2304 | struct r1conf *conf = mddev->private; |
1da177e4 | 2305 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2306 | struct blk_plug plug; |
1da177e4 LT |
2307 | |
2308 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2309 | |
2310 | blk_start_plug(&plug); | |
1da177e4 | 2311 | for (;;) { |
191ea9b2 | 2312 | |
0021b7bc | 2313 | flush_pending_writes(conf); |
191ea9b2 | 2314 | |
a35e63ef N |
2315 | spin_lock_irqsave(&conf->device_lock, flags); |
2316 | if (list_empty(head)) { | |
2317 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2318 | break; |
a35e63ef | 2319 | } |
9f2c9d12 | 2320 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2321 | list_del(head->prev); |
ddaf22ab | 2322 | conf->nr_queued--; |
1da177e4 LT |
2323 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2324 | ||
2325 | mddev = r1_bio->mddev; | |
070ec55d | 2326 | conf = mddev->private; |
4367af55 | 2327 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2328 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2329 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2330 | handle_sync_write_finished(conf, r1_bio); | |
2331 | else | |
4367af55 | 2332 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2333 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2334 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2335 | handle_write_finished(conf, r1_bio); | |
2336 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2337 | handle_read_error(conf, r1_bio); | |
2338 | else | |
d2eb35ac N |
2339 | /* just a partial read to be scheduled from separate |
2340 | * context | |
2341 | */ | |
2342 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2343 | |
1d9d5241 | 2344 | cond_resched(); |
de393cde N |
2345 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2346 | md_check_recovery(mddev); | |
1da177e4 | 2347 | } |
e1dfa0a2 | 2348 | blk_finish_plug(&plug); |
1da177e4 LT |
2349 | } |
2350 | ||
2351 | ||
e8096360 | 2352 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2353 | { |
2354 | int buffs; | |
2355 | ||
2356 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2357 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2358 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2359 | conf->poolinfo); | |
2360 | if (!conf->r1buf_pool) | |
2361 | return -ENOMEM; | |
2362 | conf->next_resync = 0; | |
2363 | return 0; | |
2364 | } | |
2365 | ||
2366 | /* | |
2367 | * perform a "sync" on one "block" | |
2368 | * | |
2369 | * We need to make sure that no normal I/O request - particularly write | |
2370 | * requests - conflict with active sync requests. | |
2371 | * | |
2372 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2373 | * that can be installed to exclude normal IO requests. | |
2374 | */ | |
2375 | ||
fd01b88c | 2376 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2377 | { |
e8096360 | 2378 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2379 | struct r1bio *r1_bio; |
1da177e4 LT |
2380 | struct bio *bio; |
2381 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2382 | int disk = -1; |
1da177e4 | 2383 | int i; |
3e198f78 N |
2384 | int wonly = -1; |
2385 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2386 | sector_t sync_blocks; |
e3b9703e | 2387 | int still_degraded = 0; |
06f60385 N |
2388 | int good_sectors = RESYNC_SECTORS; |
2389 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2390 | |
2391 | if (!conf->r1buf_pool) | |
2392 | if (init_resync(conf)) | |
57afd89f | 2393 | return 0; |
1da177e4 | 2394 | |
58c0fed4 | 2395 | max_sector = mddev->dev_sectors; |
1da177e4 | 2396 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2397 | /* If we aborted, we need to abort the |
2398 | * sync on the 'current' bitmap chunk (there will | |
2399 | * only be one in raid1 resync. | |
2400 | * We can find the current addess in mddev->curr_resync | |
2401 | */ | |
6a806c51 N |
2402 | if (mddev->curr_resync < max_sector) /* aborted */ |
2403 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2404 | &sync_blocks, 1); |
6a806c51 | 2405 | else /* completed sync */ |
191ea9b2 | 2406 | conf->fullsync = 0; |
6a806c51 N |
2407 | |
2408 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2409 | close_sync(conf); |
2410 | return 0; | |
2411 | } | |
2412 | ||
07d84d10 N |
2413 | if (mddev->bitmap == NULL && |
2414 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2415 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2416 | conf->fullsync == 0) { |
2417 | *skipped = 1; | |
2418 | return max_sector - sector_nr; | |
2419 | } | |
6394cca5 N |
2420 | /* before building a request, check if we can skip these blocks.. |
2421 | * This call the bitmap_start_sync doesn't actually record anything | |
2422 | */ | |
e3b9703e | 2423 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2424 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2425 | /* We can skip this block, and probably several more */ |
2426 | *skipped = 1; | |
2427 | return sync_blocks; | |
2428 | } | |
1da177e4 | 2429 | /* |
17999be4 N |
2430 | * If there is non-resync activity waiting for a turn, |
2431 | * and resync is going fast enough, | |
2432 | * then let it though before starting on this new sync request. | |
1da177e4 | 2433 | */ |
17999be4 | 2434 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2435 | msleep_interruptible(1000); |
17999be4 | 2436 | |
b47490c9 | 2437 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2438 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2439 | raise_barrier(conf); |
2440 | ||
2441 | conf->next_resync = sector_nr; | |
1da177e4 | 2442 | |
3e198f78 | 2443 | rcu_read_lock(); |
1da177e4 | 2444 | /* |
3e198f78 N |
2445 | * If we get a correctably read error during resync or recovery, |
2446 | * we might want to read from a different device. So we | |
2447 | * flag all drives that could conceivably be read from for READ, | |
2448 | * and any others (which will be non-In_sync devices) for WRITE. | |
2449 | * If a read fails, we try reading from something else for which READ | |
2450 | * is OK. | |
1da177e4 | 2451 | */ |
1da177e4 | 2452 | |
1da177e4 LT |
2453 | r1_bio->mddev = mddev; |
2454 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2455 | r1_bio->state = 0; |
1da177e4 | 2456 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 | 2457 | |
8f19ccb2 | 2458 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2459 | struct md_rdev *rdev; |
1da177e4 LT |
2460 | bio = r1_bio->bios[i]; |
2461 | ||
2462 | /* take from bio_init */ | |
2463 | bio->bi_next = NULL; | |
db8d9d35 | 2464 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2465 | bio->bi_flags |= 1 << BIO_UPTODATE; |
802ba064 | 2466 | bio->bi_rw = READ; |
1da177e4 LT |
2467 | bio->bi_vcnt = 0; |
2468 | bio->bi_idx = 0; | |
2469 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2470 | bio->bi_size = 0; |
2471 | bio->bi_end_io = NULL; | |
2472 | bio->bi_private = NULL; | |
2473 | ||
3e198f78 N |
2474 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2475 | if (rdev == NULL || | |
06f60385 | 2476 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2477 | if (i < conf->raid_disks) |
2478 | still_degraded = 1; | |
3e198f78 | 2479 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2480 | bio->bi_rw = WRITE; |
2481 | bio->bi_end_io = end_sync_write; | |
2482 | write_targets ++; | |
3e198f78 N |
2483 | } else { |
2484 | /* may need to read from here */ | |
06f60385 N |
2485 | sector_t first_bad = MaxSector; |
2486 | int bad_sectors; | |
2487 | ||
2488 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2489 | &first_bad, &bad_sectors)) { | |
2490 | if (first_bad > sector_nr) | |
2491 | good_sectors = first_bad - sector_nr; | |
2492 | else { | |
2493 | bad_sectors -= (sector_nr - first_bad); | |
2494 | if (min_bad == 0 || | |
2495 | min_bad > bad_sectors) | |
2496 | min_bad = bad_sectors; | |
2497 | } | |
2498 | } | |
2499 | if (sector_nr < first_bad) { | |
2500 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2501 | if (wonly < 0) | |
2502 | wonly = i; | |
2503 | } else { | |
2504 | if (disk < 0) | |
2505 | disk = i; | |
2506 | } | |
2507 | bio->bi_rw = READ; | |
2508 | bio->bi_end_io = end_sync_read; | |
2509 | read_targets++; | |
d57368af AL |
2510 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2511 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2512 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2513 | /* | |
2514 | * The device is suitable for reading (InSync), | |
2515 | * but has bad block(s) here. Let's try to correct them, | |
2516 | * if we are doing resync or repair. Otherwise, leave | |
2517 | * this device alone for this sync request. | |
2518 | */ | |
2519 | bio->bi_rw = WRITE; | |
2520 | bio->bi_end_io = end_sync_write; | |
2521 | write_targets++; | |
3e198f78 | 2522 | } |
3e198f78 | 2523 | } |
06f60385 N |
2524 | if (bio->bi_end_io) { |
2525 | atomic_inc(&rdev->nr_pending); | |
2526 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2527 | bio->bi_bdev = rdev->bdev; | |
2528 | bio->bi_private = r1_bio; | |
2529 | } | |
1da177e4 | 2530 | } |
3e198f78 N |
2531 | rcu_read_unlock(); |
2532 | if (disk < 0) | |
2533 | disk = wonly; | |
2534 | r1_bio->read_disk = disk; | |
191ea9b2 | 2535 | |
06f60385 N |
2536 | if (read_targets == 0 && min_bad > 0) { |
2537 | /* These sectors are bad on all InSync devices, so we | |
2538 | * need to mark them bad on all write targets | |
2539 | */ | |
2540 | int ok = 1; | |
8f19ccb2 | 2541 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2542 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2543 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2544 | ok = rdev_set_badblocks(rdev, sector_nr, |
2545 | min_bad, 0 | |
2546 | ) && ok; | |
2547 | } | |
2548 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2549 | *skipped = 1; | |
2550 | put_buf(r1_bio); | |
2551 | ||
2552 | if (!ok) { | |
2553 | /* Cannot record the badblocks, so need to | |
2554 | * abort the resync. | |
2555 | * If there are multiple read targets, could just | |
2556 | * fail the really bad ones ??? | |
2557 | */ | |
2558 | conf->recovery_disabled = mddev->recovery_disabled; | |
2559 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2560 | return 0; | |
2561 | } else | |
2562 | return min_bad; | |
2563 | ||
2564 | } | |
2565 | if (min_bad > 0 && min_bad < good_sectors) { | |
2566 | /* only resync enough to reach the next bad->good | |
2567 | * transition */ | |
2568 | good_sectors = min_bad; | |
2569 | } | |
2570 | ||
3e198f78 N |
2571 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2572 | /* extra read targets are also write targets */ | |
2573 | write_targets += read_targets-1; | |
2574 | ||
2575 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2576 | /* There is nowhere to write, so all non-sync |
2577 | * drives must be failed - so we are finished | |
2578 | */ | |
b7219ccb N |
2579 | sector_t rv; |
2580 | if (min_bad > 0) | |
2581 | max_sector = sector_nr + min_bad; | |
2582 | rv = max_sector - sector_nr; | |
57afd89f | 2583 | *skipped = 1; |
1da177e4 | 2584 | put_buf(r1_bio); |
1da177e4 LT |
2585 | return rv; |
2586 | } | |
2587 | ||
c6207277 N |
2588 | if (max_sector > mddev->resync_max) |
2589 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2590 | if (max_sector > sector_nr + good_sectors) |
2591 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2592 | nr_sectors = 0; |
289e99e8 | 2593 | sync_blocks = 0; |
1da177e4 LT |
2594 | do { |
2595 | struct page *page; | |
2596 | int len = PAGE_SIZE; | |
2597 | if (sector_nr + (len>>9) > max_sector) | |
2598 | len = (max_sector - sector_nr) << 9; | |
2599 | if (len == 0) | |
2600 | break; | |
6a806c51 N |
2601 | if (sync_blocks == 0) { |
2602 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2603 | &sync_blocks, still_degraded) && |
2604 | !conf->fullsync && | |
2605 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2606 | break; |
9e77c485 | 2607 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2608 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2609 | len = sync_blocks<<9; |
ab7a30c7 | 2610 | } |
191ea9b2 | 2611 | |
8f19ccb2 | 2612 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2613 | bio = r1_bio->bios[i]; |
2614 | if (bio->bi_end_io) { | |
d11c171e | 2615 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2616 | if (bio_add_page(bio, page, len, 0) == 0) { |
2617 | /* stop here */ | |
d11c171e | 2618 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2619 | while (i > 0) { |
2620 | i--; | |
2621 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2622 | if (bio->bi_end_io==NULL) |
2623 | continue; | |
1da177e4 LT |
2624 | /* remove last page from this bio */ |
2625 | bio->bi_vcnt--; | |
2626 | bio->bi_size -= len; | |
2627 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2628 | } | |
2629 | goto bio_full; | |
2630 | } | |
2631 | } | |
2632 | } | |
2633 | nr_sectors += len>>9; | |
2634 | sector_nr += len>>9; | |
191ea9b2 | 2635 | sync_blocks -= (len>>9); |
1da177e4 LT |
2636 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2637 | bio_full: | |
1da177e4 LT |
2638 | r1_bio->sectors = nr_sectors; |
2639 | ||
d11c171e N |
2640 | /* For a user-requested sync, we read all readable devices and do a |
2641 | * compare | |
2642 | */ | |
2643 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2644 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2645 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2646 | bio = r1_bio->bios[i]; |
2647 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2648 | read_targets--; |
ddac7c7e | 2649 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2650 | generic_make_request(bio); |
2651 | } | |
2652 | } | |
2653 | } else { | |
2654 | atomic_set(&r1_bio->remaining, 1); | |
2655 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2656 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2657 | generic_make_request(bio); |
1da177e4 | 2658 | |
d11c171e | 2659 | } |
1da177e4 LT |
2660 | return nr_sectors; |
2661 | } | |
2662 | ||
fd01b88c | 2663 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2664 | { |
2665 | if (sectors) | |
2666 | return sectors; | |
2667 | ||
2668 | return mddev->dev_sectors; | |
2669 | } | |
2670 | ||
e8096360 | 2671 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2672 | { |
e8096360 | 2673 | struct r1conf *conf; |
709ae487 | 2674 | int i; |
0eaf822c | 2675 | struct raid1_info *disk; |
3cb03002 | 2676 | struct md_rdev *rdev; |
709ae487 | 2677 | int err = -ENOMEM; |
1da177e4 | 2678 | |
e8096360 | 2679 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2680 | if (!conf) |
709ae487 | 2681 | goto abort; |
1da177e4 | 2682 | |
0eaf822c | 2683 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2684 | * mddev->raid_disks * 2, |
1da177e4 LT |
2685 | GFP_KERNEL); |
2686 | if (!conf->mirrors) | |
709ae487 | 2687 | goto abort; |
1da177e4 | 2688 | |
ddaf22ab N |
2689 | conf->tmppage = alloc_page(GFP_KERNEL); |
2690 | if (!conf->tmppage) | |
709ae487 | 2691 | goto abort; |
ddaf22ab | 2692 | |
709ae487 | 2693 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2694 | if (!conf->poolinfo) |
709ae487 | 2695 | goto abort; |
8f19ccb2 | 2696 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2697 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2698 | r1bio_pool_free, | |
2699 | conf->poolinfo); | |
2700 | if (!conf->r1bio_pool) | |
709ae487 N |
2701 | goto abort; |
2702 | ||
ed9bfdf1 | 2703 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2704 | |
c19d5798 | 2705 | err = -EINVAL; |
e7e72bf6 | 2706 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2707 | rdev_for_each(rdev, mddev) { |
aba336bd | 2708 | struct request_queue *q; |
709ae487 | 2709 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2710 | if (disk_idx >= mddev->raid_disks |
2711 | || disk_idx < 0) | |
2712 | continue; | |
c19d5798 | 2713 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2714 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2715 | else |
2716 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2717 | |
c19d5798 N |
2718 | if (disk->rdev) |
2719 | goto abort; | |
1da177e4 | 2720 | disk->rdev = rdev; |
aba336bd N |
2721 | q = bdev_get_queue(rdev->bdev); |
2722 | if (q->merge_bvec_fn) | |
2723 | mddev->merge_check_needed = 1; | |
1da177e4 LT |
2724 | |
2725 | disk->head_position = 0; | |
12cee5a8 | 2726 | disk->seq_start = MaxSector; |
1da177e4 LT |
2727 | } |
2728 | conf->raid_disks = mddev->raid_disks; | |
2729 | conf->mddev = mddev; | |
1da177e4 | 2730 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2731 | |
2732 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2733 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2734 | |
191ea9b2 | 2735 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2736 | conf->pending_count = 0; |
d890fa2b | 2737 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2738 | |
c19d5798 | 2739 | err = -EIO; |
8f19ccb2 | 2740 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2741 | |
2742 | disk = conf->mirrors + i; | |
2743 | ||
c19d5798 N |
2744 | if (i < conf->raid_disks && |
2745 | disk[conf->raid_disks].rdev) { | |
2746 | /* This slot has a replacement. */ | |
2747 | if (!disk->rdev) { | |
2748 | /* No original, just make the replacement | |
2749 | * a recovering spare | |
2750 | */ | |
2751 | disk->rdev = | |
2752 | disk[conf->raid_disks].rdev; | |
2753 | disk[conf->raid_disks].rdev = NULL; | |
2754 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2755 | /* Original is not in_sync - bad */ | |
2756 | goto abort; | |
2757 | } | |
2758 | ||
5fd6c1dc N |
2759 | if (!disk->rdev || |
2760 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2761 | disk->head_position = 0; |
4f0a5e01 JB |
2762 | if (disk->rdev && |
2763 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2764 | conf->fullsync = 1; |
be4d3280 | 2765 | } |
1da177e4 | 2766 | } |
709ae487 | 2767 | |
709ae487 | 2768 | err = -ENOMEM; |
0232605d | 2769 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
709ae487 N |
2770 | if (!conf->thread) { |
2771 | printk(KERN_ERR | |
9dd1e2fa | 2772 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2773 | mdname(mddev)); |
2774 | goto abort; | |
11ce99e6 | 2775 | } |
1da177e4 | 2776 | |
709ae487 N |
2777 | return conf; |
2778 | ||
2779 | abort: | |
2780 | if (conf) { | |
2781 | if (conf->r1bio_pool) | |
2782 | mempool_destroy(conf->r1bio_pool); | |
2783 | kfree(conf->mirrors); | |
2784 | safe_put_page(conf->tmppage); | |
2785 | kfree(conf->poolinfo); | |
2786 | kfree(conf); | |
2787 | } | |
2788 | return ERR_PTR(err); | |
2789 | } | |
2790 | ||
5220ea1e | 2791 | static int stop(struct mddev *mddev); |
fd01b88c | 2792 | static int run(struct mddev *mddev) |
709ae487 | 2793 | { |
e8096360 | 2794 | struct r1conf *conf; |
709ae487 | 2795 | int i; |
3cb03002 | 2796 | struct md_rdev *rdev; |
5220ea1e | 2797 | int ret; |
2ff8cc2c | 2798 | bool discard_supported = false; |
709ae487 N |
2799 | |
2800 | if (mddev->level != 1) { | |
9dd1e2fa | 2801 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2802 | mdname(mddev), mddev->level); |
2803 | return -EIO; | |
2804 | } | |
2805 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2806 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2807 | mdname(mddev)); |
2808 | return -EIO; | |
2809 | } | |
1da177e4 | 2810 | /* |
709ae487 N |
2811 | * copy the already verified devices into our private RAID1 |
2812 | * bookkeeping area. [whatever we allocate in run(), | |
2813 | * should be freed in stop()] | |
1da177e4 | 2814 | */ |
709ae487 N |
2815 | if (mddev->private == NULL) |
2816 | conf = setup_conf(mddev); | |
2817 | else | |
2818 | conf = mddev->private; | |
1da177e4 | 2819 | |
709ae487 N |
2820 | if (IS_ERR(conf)) |
2821 | return PTR_ERR(conf); | |
1da177e4 | 2822 | |
c8dc9c65 JL |
2823 | if (mddev->queue) |
2824 | blk_queue_max_write_same_sectors(mddev->queue, | |
2825 | mddev->chunk_sectors); | |
dafb20fa | 2826 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
2827 | if (!mddev->gendisk) |
2828 | continue; | |
709ae487 N |
2829 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2830 | rdev->data_offset << 9); | |
2ff8cc2c SL |
2831 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2832 | discard_supported = true; | |
1da177e4 | 2833 | } |
191ea9b2 | 2834 | |
709ae487 N |
2835 | mddev->degraded = 0; |
2836 | for (i=0; i < conf->raid_disks; i++) | |
2837 | if (conf->mirrors[i].rdev == NULL || | |
2838 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2839 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2840 | mddev->degraded++; | |
2841 | ||
2842 | if (conf->raid_disks - mddev->degraded == 1) | |
2843 | mddev->recovery_cp = MaxSector; | |
2844 | ||
8c6ac868 | 2845 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2846 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2847 | " -- starting background reconstruction\n", |
2848 | mdname(mddev)); | |
1da177e4 | 2849 | printk(KERN_INFO |
9dd1e2fa | 2850 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2851 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2852 | mddev->raid_disks); | |
709ae487 | 2853 | |
1da177e4 LT |
2854 | /* |
2855 | * Ok, everything is just fine now | |
2856 | */ | |
709ae487 N |
2857 | mddev->thread = conf->thread; |
2858 | conf->thread = NULL; | |
2859 | mddev->private = conf; | |
2860 | ||
1f403624 | 2861 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2862 | |
1ed7242e JB |
2863 | if (mddev->queue) { |
2864 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2865 | mddev->queue->backing_dev_info.congested_data = mddev; | |
6b740b8d | 2866 | blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); |
2ff8cc2c SL |
2867 | |
2868 | if (discard_supported) | |
2869 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
2870 | mddev->queue); | |
2871 | else | |
2872 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
2873 | mddev->queue); | |
1ed7242e | 2874 | } |
5220ea1e | 2875 | |
2876 | ret = md_integrity_register(mddev); | |
2877 | if (ret) | |
2878 | stop(mddev); | |
2879 | return ret; | |
1da177e4 LT |
2880 | } |
2881 | ||
fd01b88c | 2882 | static int stop(struct mddev *mddev) |
1da177e4 | 2883 | { |
e8096360 | 2884 | struct r1conf *conf = mddev->private; |
4b6d287f | 2885 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2886 | |
2887 | /* wait for behind writes to complete */ | |
e555190d | 2888 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2889 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2890 | mdname(mddev)); | |
4b6d287f | 2891 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2892 | wait_event(bitmap->behind_wait, |
2893 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2894 | } |
1da177e4 | 2895 | |
409c57f3 N |
2896 | raise_barrier(conf); |
2897 | lower_barrier(conf); | |
2898 | ||
01f96c0a | 2899 | md_unregister_thread(&mddev->thread); |
1da177e4 LT |
2900 | if (conf->r1bio_pool) |
2901 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2902 | kfree(conf->mirrors); |
2903 | kfree(conf->poolinfo); | |
1da177e4 LT |
2904 | kfree(conf); |
2905 | mddev->private = NULL; | |
2906 | return 0; | |
2907 | } | |
2908 | ||
fd01b88c | 2909 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2910 | { |
2911 | /* no resync is happening, and there is enough space | |
2912 | * on all devices, so we can resize. | |
2913 | * We need to make sure resync covers any new space. | |
2914 | * If the array is shrinking we should possibly wait until | |
2915 | * any io in the removed space completes, but it hardly seems | |
2916 | * worth it. | |
2917 | */ | |
a4a6125a N |
2918 | sector_t newsize = raid1_size(mddev, sectors, 0); |
2919 | if (mddev->external_size && | |
2920 | mddev->array_sectors > newsize) | |
b522adcd | 2921 | return -EINVAL; |
a4a6125a N |
2922 | if (mddev->bitmap) { |
2923 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
2924 | if (ret) | |
2925 | return ret; | |
2926 | } | |
2927 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 2928 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2929 | revalidate_disk(mddev->gendisk); |
b522adcd | 2930 | if (sectors > mddev->dev_sectors && |
b098636c | 2931 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2932 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2933 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2934 | } | |
b522adcd | 2935 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2936 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2937 | return 0; |
2938 | } | |
2939 | ||
fd01b88c | 2940 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
2941 | { |
2942 | /* We need to: | |
2943 | * 1/ resize the r1bio_pool | |
2944 | * 2/ resize conf->mirrors | |
2945 | * | |
2946 | * We allocate a new r1bio_pool if we can. | |
2947 | * Then raise a device barrier and wait until all IO stops. | |
2948 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2949 | * |
2950 | * At the same time, we "pack" the devices so that all the missing | |
2951 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2952 | */ |
2953 | mempool_t *newpool, *oldpool; | |
2954 | struct pool_info *newpoolinfo; | |
0eaf822c | 2955 | struct raid1_info *newmirrors; |
e8096360 | 2956 | struct r1conf *conf = mddev->private; |
63c70c4f | 2957 | int cnt, raid_disks; |
c04be0aa | 2958 | unsigned long flags; |
b5470dc5 | 2959 | int d, d2, err; |
1da177e4 | 2960 | |
63c70c4f | 2961 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2962 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2963 | mddev->layout != mddev->new_layout || |
2964 | mddev->level != mddev->new_level) { | |
664e7c41 | 2965 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2966 | mddev->new_layout = mddev->layout; |
2967 | mddev->new_level = mddev->level; | |
2968 | return -EINVAL; | |
2969 | } | |
2970 | ||
b5470dc5 DW |
2971 | err = md_allow_write(mddev); |
2972 | if (err) | |
2973 | return err; | |
2a2275d6 | 2974 | |
63c70c4f N |
2975 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2976 | ||
6ea9c07c N |
2977 | if (raid_disks < conf->raid_disks) { |
2978 | cnt=0; | |
2979 | for (d= 0; d < conf->raid_disks; d++) | |
2980 | if (conf->mirrors[d].rdev) | |
2981 | cnt++; | |
2982 | if (cnt > raid_disks) | |
1da177e4 | 2983 | return -EBUSY; |
6ea9c07c | 2984 | } |
1da177e4 LT |
2985 | |
2986 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2987 | if (!newpoolinfo) | |
2988 | return -ENOMEM; | |
2989 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 2990 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
2991 | |
2992 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2993 | r1bio_pool_free, newpoolinfo); | |
2994 | if (!newpool) { | |
2995 | kfree(newpoolinfo); | |
2996 | return -ENOMEM; | |
2997 | } | |
0eaf822c | 2998 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 2999 | GFP_KERNEL); |
1da177e4 LT |
3000 | if (!newmirrors) { |
3001 | kfree(newpoolinfo); | |
3002 | mempool_destroy(newpool); | |
3003 | return -ENOMEM; | |
3004 | } | |
1da177e4 | 3005 | |
17999be4 | 3006 | raise_barrier(conf); |
1da177e4 LT |
3007 | |
3008 | /* ok, everything is stopped */ | |
3009 | oldpool = conf->r1bio_pool; | |
3010 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3011 | |
a88aa786 | 3012 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3013 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3014 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3015 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3016 | rdev->raid_disk = d2; |
36fad858 NK |
3017 | sysfs_unlink_rdev(mddev, rdev); |
3018 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 3019 | printk(KERN_WARNING |
36fad858 NK |
3020 | "md/raid1:%s: cannot register rd%d\n", |
3021 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3022 | } |
a88aa786 N |
3023 | if (rdev) |
3024 | newmirrors[d2++].rdev = rdev; | |
3025 | } | |
1da177e4 LT |
3026 | kfree(conf->mirrors); |
3027 | conf->mirrors = newmirrors; | |
3028 | kfree(conf->poolinfo); | |
3029 | conf->poolinfo = newpoolinfo; | |
3030 | ||
c04be0aa | 3031 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3032 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3033 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3034 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3035 | mddev->delta_disks = 0; |
1da177e4 | 3036 | |
17999be4 | 3037 | lower_barrier(conf); |
1da177e4 LT |
3038 | |
3039 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3040 | md_wakeup_thread(mddev->thread); | |
3041 | ||
3042 | mempool_destroy(oldpool); | |
3043 | return 0; | |
3044 | } | |
3045 | ||
fd01b88c | 3046 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3047 | { |
e8096360 | 3048 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3049 | |
3050 | switch(state) { | |
6eef4b21 N |
3051 | case 2: /* wake for suspend */ |
3052 | wake_up(&conf->wait_barrier); | |
3053 | break; | |
9e6603da | 3054 | case 1: |
17999be4 | 3055 | raise_barrier(conf); |
36fa3063 | 3056 | break; |
9e6603da | 3057 | case 0: |
17999be4 | 3058 | lower_barrier(conf); |
36fa3063 N |
3059 | break; |
3060 | } | |
36fa3063 N |
3061 | } |
3062 | ||
fd01b88c | 3063 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3064 | { |
3065 | /* raid1 can take over: | |
3066 | * raid5 with 2 devices, any layout or chunk size | |
3067 | */ | |
3068 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3069 | struct r1conf *conf; |
709ae487 N |
3070 | mddev->new_level = 1; |
3071 | mddev->new_layout = 0; | |
3072 | mddev->new_chunk_sectors = 0; | |
3073 | conf = setup_conf(mddev); | |
3074 | if (!IS_ERR(conf)) | |
3075 | conf->barrier = 1; | |
3076 | return conf; | |
3077 | } | |
3078 | return ERR_PTR(-EINVAL); | |
3079 | } | |
1da177e4 | 3080 | |
84fc4b56 | 3081 | static struct md_personality raid1_personality = |
1da177e4 LT |
3082 | { |
3083 | .name = "raid1", | |
2604b703 | 3084 | .level = 1, |
1da177e4 LT |
3085 | .owner = THIS_MODULE, |
3086 | .make_request = make_request, | |
3087 | .run = run, | |
3088 | .stop = stop, | |
3089 | .status = status, | |
3090 | .error_handler = error, | |
3091 | .hot_add_disk = raid1_add_disk, | |
3092 | .hot_remove_disk= raid1_remove_disk, | |
3093 | .spare_active = raid1_spare_active, | |
3094 | .sync_request = sync_request, | |
3095 | .resize = raid1_resize, | |
80c3a6ce | 3096 | .size = raid1_size, |
63c70c4f | 3097 | .check_reshape = raid1_reshape, |
36fa3063 | 3098 | .quiesce = raid1_quiesce, |
709ae487 | 3099 | .takeover = raid1_takeover, |
1da177e4 LT |
3100 | }; |
3101 | ||
3102 | static int __init raid_init(void) | |
3103 | { | |
2604b703 | 3104 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3105 | } |
3106 | ||
3107 | static void raid_exit(void) | |
3108 | { | |
2604b703 | 3109 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3110 | } |
3111 | ||
3112 | module_init(raid_init); | |
3113 | module_exit(raid_exit); | |
3114 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3115 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3116 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3117 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3118 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3119 | |
3120 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |