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 | ||
191ea9b2 | 34 | #include "dm-bio-list.h" |
25570727 | 35 | #include <linux/delay.h> |
1da177e4 | 36 | #include <linux/raid/raid1.h> |
191ea9b2 N |
37 | #include <linux/raid/bitmap.h> |
38 | ||
39 | #define DEBUG 0 | |
40 | #if DEBUG | |
41 | #define PRINTK(x...) printk(x) | |
42 | #else | |
43 | #define PRINTK(x...) | |
44 | #endif | |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Number of guaranteed r1bios in case of extreme VM load: | |
48 | */ | |
49 | #define NR_RAID1_BIOS 256 | |
50 | ||
1da177e4 LT |
51 | |
52 | static void unplug_slaves(mddev_t *mddev); | |
53 | ||
17999be4 N |
54 | static void allow_barrier(conf_t *conf); |
55 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 56 | |
dd0fc66f | 57 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
58 | { |
59 | struct pool_info *pi = data; | |
60 | r1bio_t *r1_bio; | |
61 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); | |
62 | ||
63 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
9ffae0cf N |
64 | r1_bio = kzalloc(size, gfp_flags); |
65 | if (!r1_bio) | |
1da177e4 LT |
66 | unplug_slaves(pi->mddev); |
67 | ||
68 | return r1_bio; | |
69 | } | |
70 | ||
71 | static void r1bio_pool_free(void *r1_bio, void *data) | |
72 | { | |
73 | kfree(r1_bio); | |
74 | } | |
75 | ||
76 | #define RESYNC_BLOCK_SIZE (64*1024) | |
77 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
78 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
79 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
80 | #define RESYNC_WINDOW (2048*1024) | |
81 | ||
dd0fc66f | 82 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
83 | { |
84 | struct pool_info *pi = data; | |
85 | struct page *page; | |
86 | r1bio_t *r1_bio; | |
87 | struct bio *bio; | |
88 | int i, j; | |
89 | ||
90 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
91 | if (!r1_bio) { | |
92 | unplug_slaves(pi->mddev); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Allocate bios : 1 for reading, n-1 for writing | |
98 | */ | |
99 | for (j = pi->raid_disks ; j-- ; ) { | |
100 | bio = bio_alloc(gfp_flags, RESYNC_PAGES); | |
101 | if (!bio) | |
102 | goto out_free_bio; | |
103 | r1_bio->bios[j] = bio; | |
104 | } | |
105 | /* | |
106 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
107 | * the first bio. |
108 | * If this is a user-requested check/repair, allocate | |
109 | * RESYNC_PAGES for each bio. | |
1da177e4 | 110 | */ |
d11c171e N |
111 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
112 | j = pi->raid_disks; | |
113 | else | |
114 | j = 1; | |
115 | while(j--) { | |
116 | bio = r1_bio->bios[j]; | |
117 | for (i = 0; i < RESYNC_PAGES; i++) { | |
118 | page = alloc_page(gfp_flags); | |
119 | if (unlikely(!page)) | |
120 | goto out_free_pages; | |
121 | ||
122 | bio->bi_io_vec[i].bv_page = page; | |
123 | } | |
124 | } | |
125 | /* If not user-requests, copy the page pointers to all bios */ | |
126 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
127 | for (i=0; i<RESYNC_PAGES ; i++) | |
128 | for (j=1; j<pi->raid_disks; j++) | |
129 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
130 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
131 | } |
132 | ||
133 | r1_bio->master_bio = NULL; | |
134 | ||
135 | return r1_bio; | |
136 | ||
137 | out_free_pages: | |
d11c171e N |
138 | for (i=0; i < RESYNC_PAGES ; i++) |
139 | for (j=0 ; j < pi->raid_disks; j++) | |
1345b1d8 | 140 | safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 141 | j = -1; |
1da177e4 LT |
142 | out_free_bio: |
143 | while ( ++j < pi->raid_disks ) | |
144 | bio_put(r1_bio->bios[j]); | |
145 | r1bio_pool_free(r1_bio, data); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
150 | { | |
151 | struct pool_info *pi = data; | |
d11c171e | 152 | int i,j; |
1da177e4 | 153 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 154 | |
d11c171e N |
155 | for (i = 0; i < RESYNC_PAGES; i++) |
156 | for (j = pi->raid_disks; j-- ;) { | |
157 | if (j == 0 || | |
158 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
159 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 160 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 161 | } |
1da177e4 LT |
162 | for (i=0 ; i < pi->raid_disks; i++) |
163 | bio_put(r1bio->bios[i]); | |
164 | ||
165 | r1bio_pool_free(r1bio, data); | |
166 | } | |
167 | ||
168 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
169 | { | |
170 | int i; | |
171 | ||
172 | for (i = 0; i < conf->raid_disks; i++) { | |
173 | struct bio **bio = r1_bio->bios + i; | |
cf30a473 | 174 | if (*bio && *bio != IO_BLOCKED) |
1da177e4 LT |
175 | bio_put(*bio); |
176 | *bio = NULL; | |
177 | } | |
178 | } | |
179 | ||
858119e1 | 180 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 181 | { |
1da177e4 LT |
182 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
183 | ||
184 | /* | |
185 | * Wake up any possible resync thread that waits for the device | |
186 | * to go idle. | |
187 | */ | |
17999be4 | 188 | allow_barrier(conf); |
1da177e4 LT |
189 | |
190 | put_all_bios(conf, r1_bio); | |
191 | mempool_free(r1_bio, conf->r1bio_pool); | |
192 | } | |
193 | ||
858119e1 | 194 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 LT |
195 | { |
196 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
3e198f78 N |
197 | int i; |
198 | ||
199 | for (i=0; i<conf->raid_disks; i++) { | |
200 | struct bio *bio = r1_bio->bios[i]; | |
201 | if (bio->bi_end_io) | |
202 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
203 | } | |
1da177e4 LT |
204 | |
205 | mempool_free(r1_bio, conf->r1buf_pool); | |
206 | ||
17999be4 | 207 | lower_barrier(conf); |
1da177e4 LT |
208 | } |
209 | ||
210 | static void reschedule_retry(r1bio_t *r1_bio) | |
211 | { | |
212 | unsigned long flags; | |
213 | mddev_t *mddev = r1_bio->mddev; | |
214 | conf_t *conf = mddev_to_conf(mddev); | |
215 | ||
216 | spin_lock_irqsave(&conf->device_lock, flags); | |
217 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 218 | conf->nr_queued ++; |
1da177e4 LT |
219 | spin_unlock_irqrestore(&conf->device_lock, flags); |
220 | ||
17999be4 | 221 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
222 | md_wakeup_thread(mddev->thread); |
223 | } | |
224 | ||
225 | /* | |
226 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
227 | * operation and are ready to return a success/failure code to the buffer | |
228 | * cache layer. | |
229 | */ | |
230 | static void raid_end_bio_io(r1bio_t *r1_bio) | |
231 | { | |
232 | struct bio *bio = r1_bio->master_bio; | |
233 | ||
4b6d287f N |
234 | /* if nobody has done the final endio yet, do it now */ |
235 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
236 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
237 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
238 | (unsigned long long) bio->bi_sector, | |
239 | (unsigned long long) bio->bi_sector + | |
240 | (bio->bi_size >> 9) - 1); | |
241 | ||
6712ecf8 | 242 | bio_endio(bio, |
4b6d287f N |
243 | test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); |
244 | } | |
1da177e4 LT |
245 | free_r1bio(r1_bio); |
246 | } | |
247 | ||
248 | /* | |
249 | * Update disk head position estimator based on IRQ completion info. | |
250 | */ | |
251 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
252 | { | |
253 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
254 | ||
255 | conf->mirrors[disk].head_position = | |
256 | r1_bio->sector + (r1_bio->sectors); | |
257 | } | |
258 | ||
6712ecf8 | 259 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
260 | { |
261 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
262 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
263 | int mirror; | |
264 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
265 | ||
1da177e4 LT |
266 | mirror = r1_bio->read_disk; |
267 | /* | |
268 | * this branch is our 'one mirror IO has finished' event handler: | |
269 | */ | |
ddaf22ab N |
270 | update_head_pos(mirror, r1_bio); |
271 | ||
dd00a99e N |
272 | if (uptodate) |
273 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
274 | else { | |
275 | /* If all other devices have failed, we want to return | |
276 | * the error upwards rather than fail the last device. | |
277 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 278 | */ |
dd00a99e N |
279 | unsigned long flags; |
280 | spin_lock_irqsave(&conf->device_lock, flags); | |
281 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
282 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
283 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
284 | uptodate = 1; | |
285 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
286 | } | |
1da177e4 | 287 | |
dd00a99e | 288 | if (uptodate) |
1da177e4 | 289 | raid_end_bio_io(r1_bio); |
dd00a99e | 290 | else { |
1da177e4 LT |
291 | /* |
292 | * oops, read error: | |
293 | */ | |
294 | char b[BDEVNAME_SIZE]; | |
295 | if (printk_ratelimit()) | |
296 | printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n", | |
297 | bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); | |
298 | reschedule_retry(r1_bio); | |
299 | } | |
300 | ||
301 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
302 | } |
303 | ||
6712ecf8 | 304 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
305 | { |
306 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
307 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
a9701a30 | 308 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
1da177e4 | 309 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
04b857f7 | 310 | struct bio *to_put = NULL; |
1da177e4 | 311 | |
1da177e4 LT |
312 | |
313 | for (mirror = 0; mirror < conf->raid_disks; mirror++) | |
314 | if (r1_bio->bios[mirror] == bio) | |
315 | break; | |
316 | ||
bea27718 | 317 | if (error == -EOPNOTSUPP && test_bit(R1BIO_Barrier, &r1_bio->state)) { |
a9701a30 N |
318 | set_bit(BarriersNotsupp, &conf->mirrors[mirror].rdev->flags); |
319 | set_bit(R1BIO_BarrierRetry, &r1_bio->state); | |
320 | r1_bio->mddev->barriers_work = 0; | |
5e7dd2ab | 321 | /* Don't rdev_dec_pending in this branch - keep it for the retry */ |
a9701a30 | 322 | } else { |
1da177e4 | 323 | /* |
a9701a30 | 324 | * this branch is our 'one mirror IO has finished' event handler: |
1da177e4 | 325 | */ |
a9701a30 | 326 | r1_bio->bios[mirror] = NULL; |
04b857f7 | 327 | to_put = bio; |
a9701a30 N |
328 | if (!uptodate) { |
329 | md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); | |
330 | /* an I/O failed, we can't clear the bitmap */ | |
331 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
332 | } else | |
333 | /* | |
334 | * Set R1BIO_Uptodate in our master bio, so that | |
335 | * we will return a good error code for to the higher | |
336 | * levels even if IO on some other mirrored buffer fails. | |
337 | * | |
338 | * The 'master' represents the composite IO operation to | |
339 | * user-side. So if something waits for IO, then it will | |
340 | * wait for the 'master' bio. | |
341 | */ | |
342 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
343 | ||
344 | update_head_pos(mirror, r1_bio); | |
345 | ||
346 | if (behind) { | |
347 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
348 | atomic_dec(&r1_bio->behind_remaining); | |
349 | ||
350 | /* In behind mode, we ACK the master bio once the I/O has safely | |
351 | * reached all non-writemostly disks. Setting the Returned bit | |
352 | * ensures that this gets done only once -- we don't ever want to | |
353 | * return -EIO here, instead we'll wait */ | |
354 | ||
355 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
356 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
357 | /* Maybe we can return now */ | |
358 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
359 | struct bio *mbio = r1_bio->master_bio; | |
360 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
361 | (unsigned long long) mbio->bi_sector, | |
362 | (unsigned long long) mbio->bi_sector + | |
363 | (mbio->bi_size >> 9) - 1); | |
6712ecf8 | 364 | bio_endio(mbio, 0); |
a9701a30 | 365 | } |
4b6d287f N |
366 | } |
367 | } | |
5e7dd2ab | 368 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
4b6d287f | 369 | } |
1da177e4 LT |
370 | /* |
371 | * | |
372 | * Let's see if all mirrored write operations have finished | |
373 | * already. | |
374 | */ | |
375 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
c70810b3 | 376 | if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) |
a9701a30 | 377 | reschedule_retry(r1_bio); |
c70810b3 N |
378 | else { |
379 | /* it really is the end of this request */ | |
380 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
381 | /* free extra copy of the data pages */ | |
382 | int i = bio->bi_vcnt; | |
383 | while (i--) | |
384 | safe_put_page(bio->bi_io_vec[i].bv_page); | |
385 | } | |
386 | /* clear the bitmap if all writes complete successfully */ | |
387 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
388 | r1_bio->sectors, | |
389 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
390 | behind); | |
391 | md_write_end(r1_bio->mddev); | |
392 | raid_end_bio_io(r1_bio); | |
4b6d287f | 393 | } |
1da177e4 | 394 | } |
c70810b3 | 395 | |
04b857f7 N |
396 | if (to_put) |
397 | bio_put(to_put); | |
1da177e4 LT |
398 | } |
399 | ||
400 | ||
401 | /* | |
402 | * This routine returns the disk from which the requested read should | |
403 | * be done. There is a per-array 'next expected sequential IO' sector | |
404 | * number - if this matches on the next IO then we use the last disk. | |
405 | * There is also a per-disk 'last know head position' sector that is | |
406 | * maintained from IRQ contexts, both the normal and the resync IO | |
407 | * completion handlers update this position correctly. If there is no | |
408 | * perfect sequential match then we pick the disk whose head is closest. | |
409 | * | |
410 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
411 | * because position is mirror, not device based. | |
412 | * | |
413 | * The rdev for the device selected will have nr_pending incremented. | |
414 | */ | |
415 | static int read_balance(conf_t *conf, r1bio_t *r1_bio) | |
416 | { | |
417 | const unsigned long this_sector = r1_bio->sector; | |
418 | int new_disk = conf->last_used, disk = new_disk; | |
8ddf9efe | 419 | int wonly_disk = -1; |
1da177e4 LT |
420 | const int sectors = r1_bio->sectors; |
421 | sector_t new_distance, current_distance; | |
8ddf9efe | 422 | mdk_rdev_t *rdev; |
1da177e4 LT |
423 | |
424 | rcu_read_lock(); | |
425 | /* | |
8ddf9efe | 426 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
427 | * device if no resync is going on, or below the resync window. |
428 | * We take the first readable disk when above the resync window. | |
429 | */ | |
430 | retry: | |
431 | if (conf->mddev->recovery_cp < MaxSector && | |
432 | (this_sector + sectors >= conf->next_resync)) { | |
433 | /* Choose the first operation device, for consistancy */ | |
434 | new_disk = 0; | |
435 | ||
d6065f7b | 436 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
cf30a473 | 437 | r1_bio->bios[new_disk] == IO_BLOCKED || |
b2d444d7 | 438 | !rdev || !test_bit(In_sync, &rdev->flags) |
8ddf9efe | 439 | || test_bit(WriteMostly, &rdev->flags); |
d6065f7b | 440 | rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) { |
8ddf9efe | 441 | |
cf30a473 N |
442 | if (rdev && test_bit(In_sync, &rdev->flags) && |
443 | r1_bio->bios[new_disk] != IO_BLOCKED) | |
8ddf9efe N |
444 | wonly_disk = new_disk; |
445 | ||
446 | if (new_disk == conf->raid_disks - 1) { | |
447 | new_disk = wonly_disk; | |
1da177e4 LT |
448 | break; |
449 | } | |
450 | } | |
451 | goto rb_out; | |
452 | } | |
453 | ||
454 | ||
455 | /* make sure the disk is operational */ | |
d6065f7b | 456 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
cf30a473 | 457 | r1_bio->bios[new_disk] == IO_BLOCKED || |
b2d444d7 | 458 | !rdev || !test_bit(In_sync, &rdev->flags) || |
8ddf9efe | 459 | test_bit(WriteMostly, &rdev->flags); |
d6065f7b | 460 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) { |
8ddf9efe | 461 | |
cf30a473 N |
462 | if (rdev && test_bit(In_sync, &rdev->flags) && |
463 | r1_bio->bios[new_disk] != IO_BLOCKED) | |
8ddf9efe N |
464 | wonly_disk = new_disk; |
465 | ||
1da177e4 LT |
466 | if (new_disk <= 0) |
467 | new_disk = conf->raid_disks; | |
468 | new_disk--; | |
469 | if (new_disk == disk) { | |
8ddf9efe N |
470 | new_disk = wonly_disk; |
471 | break; | |
1da177e4 LT |
472 | } |
473 | } | |
8ddf9efe N |
474 | |
475 | if (new_disk < 0) | |
476 | goto rb_out; | |
477 | ||
1da177e4 LT |
478 | disk = new_disk; |
479 | /* now disk == new_disk == starting point for search */ | |
480 | ||
481 | /* | |
482 | * Don't change to another disk for sequential reads: | |
483 | */ | |
484 | if (conf->next_seq_sect == this_sector) | |
485 | goto rb_out; | |
486 | if (this_sector == conf->mirrors[new_disk].head_position) | |
487 | goto rb_out; | |
488 | ||
489 | current_distance = abs(this_sector - conf->mirrors[disk].head_position); | |
490 | ||
491 | /* Find the disk whose head is closest */ | |
492 | ||
493 | do { | |
494 | if (disk <= 0) | |
495 | disk = conf->raid_disks; | |
496 | disk--; | |
497 | ||
d6065f7b | 498 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
8ddf9efe | 499 | |
cf30a473 | 500 | if (!rdev || r1_bio->bios[disk] == IO_BLOCKED || |
b2d444d7 | 501 | !test_bit(In_sync, &rdev->flags) || |
8ddf9efe | 502 | test_bit(WriteMostly, &rdev->flags)) |
1da177e4 LT |
503 | continue; |
504 | ||
505 | if (!atomic_read(&rdev->nr_pending)) { | |
506 | new_disk = disk; | |
1da177e4 LT |
507 | break; |
508 | } | |
509 | new_distance = abs(this_sector - conf->mirrors[disk].head_position); | |
510 | if (new_distance < current_distance) { | |
511 | current_distance = new_distance; | |
512 | new_disk = disk; | |
1da177e4 LT |
513 | } |
514 | } while (disk != conf->last_used); | |
515 | ||
8ddf9efe | 516 | rb_out: |
1da177e4 LT |
517 | |
518 | ||
519 | if (new_disk >= 0) { | |
d6065f7b | 520 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
8ddf9efe N |
521 | if (!rdev) |
522 | goto retry; | |
523 | atomic_inc(&rdev->nr_pending); | |
b2d444d7 | 524 | if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
525 | /* cannot risk returning a device that failed |
526 | * before we inc'ed nr_pending | |
527 | */ | |
03c902e1 | 528 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
529 | goto retry; |
530 | } | |
8ddf9efe N |
531 | conf->next_seq_sect = this_sector + sectors; |
532 | conf->last_used = new_disk; | |
1da177e4 LT |
533 | } |
534 | rcu_read_unlock(); | |
535 | ||
536 | return new_disk; | |
537 | } | |
538 | ||
539 | static void unplug_slaves(mddev_t *mddev) | |
540 | { | |
541 | conf_t *conf = mddev_to_conf(mddev); | |
542 | int i; | |
543 | ||
544 | rcu_read_lock(); | |
545 | for (i=0; i<mddev->raid_disks; i++) { | |
d6065f7b | 546 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
b2d444d7 | 547 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { |
165125e1 | 548 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
1da177e4 LT |
549 | |
550 | atomic_inc(&rdev->nr_pending); | |
551 | rcu_read_unlock(); | |
552 | ||
2ad8b1ef | 553 | blk_unplug(r_queue); |
1da177e4 LT |
554 | |
555 | rdev_dec_pending(rdev, mddev); | |
556 | rcu_read_lock(); | |
557 | } | |
558 | } | |
559 | rcu_read_unlock(); | |
560 | } | |
561 | ||
165125e1 | 562 | static void raid1_unplug(struct request_queue *q) |
1da177e4 | 563 | { |
191ea9b2 N |
564 | mddev_t *mddev = q->queuedata; |
565 | ||
566 | unplug_slaves(mddev); | |
567 | md_wakeup_thread(mddev->thread); | |
1da177e4 LT |
568 | } |
569 | ||
0d129228 N |
570 | static int raid1_congested(void *data, int bits) |
571 | { | |
572 | mddev_t *mddev = data; | |
573 | conf_t *conf = mddev_to_conf(mddev); | |
574 | int i, ret = 0; | |
575 | ||
576 | rcu_read_lock(); | |
577 | for (i = 0; i < mddev->raid_disks; i++) { | |
578 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
579 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
165125e1 | 580 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 N |
581 | |
582 | /* Note the '|| 1' - when read_balance prefers | |
583 | * non-congested targets, it can be removed | |
584 | */ | |
585 | if ((bits & (1<<BDI_write_congested)) || 1) | |
586 | ret |= bdi_congested(&q->backing_dev_info, bits); | |
587 | else | |
588 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
589 | } | |
590 | } | |
591 | rcu_read_unlock(); | |
592 | return ret; | |
593 | } | |
594 | ||
595 | ||
a35e63ef N |
596 | static int flush_pending_writes(conf_t *conf) |
597 | { | |
598 | /* Any writes that have been queued but are awaiting | |
599 | * bitmap updates get flushed here. | |
600 | * We return 1 if any requests were actually submitted. | |
601 | */ | |
602 | int rv = 0; | |
603 | ||
604 | spin_lock_irq(&conf->device_lock); | |
605 | ||
606 | if (conf->pending_bio_list.head) { | |
607 | struct bio *bio; | |
608 | bio = bio_list_get(&conf->pending_bio_list); | |
609 | blk_remove_plug(conf->mddev->queue); | |
610 | spin_unlock_irq(&conf->device_lock); | |
611 | /* flush any pending bitmap writes to | |
612 | * disk before proceeding w/ I/O */ | |
613 | bitmap_unplug(conf->mddev->bitmap); | |
614 | ||
615 | while (bio) { /* submit pending writes */ | |
616 | struct bio *next = bio->bi_next; | |
617 | bio->bi_next = NULL; | |
618 | generic_make_request(bio); | |
619 | bio = next; | |
620 | } | |
621 | rv = 1; | |
622 | } else | |
623 | spin_unlock_irq(&conf->device_lock); | |
624 | return rv; | |
625 | } | |
626 | ||
17999be4 N |
627 | /* Barriers.... |
628 | * Sometimes we need to suspend IO while we do something else, | |
629 | * either some resync/recovery, or reconfigure the array. | |
630 | * To do this we raise a 'barrier'. | |
631 | * The 'barrier' is a counter that can be raised multiple times | |
632 | * to count how many activities are happening which preclude | |
633 | * normal IO. | |
634 | * We can only raise the barrier if there is no pending IO. | |
635 | * i.e. if nr_pending == 0. | |
636 | * We choose only to raise the barrier if no-one is waiting for the | |
637 | * barrier to go down. This means that as soon as an IO request | |
638 | * is ready, no other operations which require a barrier will start | |
639 | * until the IO request has had a chance. | |
640 | * | |
641 | * So: regular IO calls 'wait_barrier'. When that returns there | |
642 | * is no backgroup IO happening, It must arrange to call | |
643 | * allow_barrier when it has finished its IO. | |
644 | * backgroup IO calls must call raise_barrier. Once that returns | |
645 | * there is no normal IO happeing. It must arrange to call | |
646 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
647 | */ |
648 | #define RESYNC_DEPTH 32 | |
649 | ||
17999be4 | 650 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
651 | { |
652 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
653 | |
654 | /* Wait until no block IO is waiting */ | |
655 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
656 | conf->resync_lock, | |
657 | raid1_unplug(conf->mddev->queue)); | |
658 | ||
659 | /* block any new IO from starting */ | |
660 | conf->barrier++; | |
661 | ||
662 | /* No wait for all pending IO to complete */ | |
663 | wait_event_lock_irq(conf->wait_barrier, | |
664 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
665 | conf->resync_lock, | |
666 | raid1_unplug(conf->mddev->queue)); | |
667 | ||
668 | spin_unlock_irq(&conf->resync_lock); | |
669 | } | |
670 | ||
671 | static void lower_barrier(conf_t *conf) | |
672 | { | |
673 | unsigned long flags; | |
674 | spin_lock_irqsave(&conf->resync_lock, flags); | |
675 | conf->barrier--; | |
676 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
677 | wake_up(&conf->wait_barrier); | |
678 | } | |
679 | ||
680 | static void wait_barrier(conf_t *conf) | |
681 | { | |
682 | spin_lock_irq(&conf->resync_lock); | |
683 | if (conf->barrier) { | |
684 | conf->nr_waiting++; | |
685 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
686 | conf->resync_lock, | |
687 | raid1_unplug(conf->mddev->queue)); | |
688 | conf->nr_waiting--; | |
1da177e4 | 689 | } |
17999be4 | 690 | conf->nr_pending++; |
1da177e4 LT |
691 | spin_unlock_irq(&conf->resync_lock); |
692 | } | |
693 | ||
17999be4 N |
694 | static void allow_barrier(conf_t *conf) |
695 | { | |
696 | unsigned long flags; | |
697 | spin_lock_irqsave(&conf->resync_lock, flags); | |
698 | conf->nr_pending--; | |
699 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
700 | wake_up(&conf->wait_barrier); | |
701 | } | |
702 | ||
ddaf22ab N |
703 | static void freeze_array(conf_t *conf) |
704 | { | |
705 | /* stop syncio and normal IO and wait for everything to | |
706 | * go quite. | |
707 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
708 | * wait until nr_pending match nr_queued+1 |
709 | * This is called in the context of one normal IO request | |
710 | * that has failed. Thus any sync request that might be pending | |
711 | * will be blocked by nr_pending, and we need to wait for | |
712 | * pending IO requests to complete or be queued for re-try. | |
713 | * Thus the number queued (nr_queued) plus this request (1) | |
714 | * must match the number of pending IOs (nr_pending) before | |
715 | * we continue. | |
ddaf22ab N |
716 | */ |
717 | spin_lock_irq(&conf->resync_lock); | |
718 | conf->barrier++; | |
719 | conf->nr_waiting++; | |
720 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 721 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 722 | conf->resync_lock, |
a35e63ef N |
723 | ({ flush_pending_writes(conf); |
724 | raid1_unplug(conf->mddev->queue); })); | |
ddaf22ab N |
725 | spin_unlock_irq(&conf->resync_lock); |
726 | } | |
727 | static void unfreeze_array(conf_t *conf) | |
728 | { | |
729 | /* reverse the effect of the freeze */ | |
730 | spin_lock_irq(&conf->resync_lock); | |
731 | conf->barrier--; | |
732 | conf->nr_waiting--; | |
733 | wake_up(&conf->wait_barrier); | |
734 | spin_unlock_irq(&conf->resync_lock); | |
735 | } | |
736 | ||
17999be4 | 737 | |
4b6d287f N |
738 | /* duplicate the data pages for behind I/O */ |
739 | static struct page **alloc_behind_pages(struct bio *bio) | |
740 | { | |
741 | int i; | |
742 | struct bio_vec *bvec; | |
9ffae0cf | 743 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *), |
4b6d287f N |
744 | GFP_NOIO); |
745 | if (unlikely(!pages)) | |
746 | goto do_sync_io; | |
747 | ||
4b6d287f N |
748 | bio_for_each_segment(bvec, bio, i) { |
749 | pages[i] = alloc_page(GFP_NOIO); | |
750 | if (unlikely(!pages[i])) | |
751 | goto do_sync_io; | |
752 | memcpy(kmap(pages[i]) + bvec->bv_offset, | |
753 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
754 | kunmap(pages[i]); | |
755 | kunmap(bvec->bv_page); | |
756 | } | |
757 | ||
758 | return pages; | |
759 | ||
760 | do_sync_io: | |
761 | if (pages) | |
762 | for (i = 0; i < bio->bi_vcnt && pages[i]; i++) | |
2d1f3b5d | 763 | put_page(pages[i]); |
4b6d287f N |
764 | kfree(pages); |
765 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); | |
766 | return NULL; | |
767 | } | |
768 | ||
165125e1 | 769 | static int make_request(struct request_queue *q, struct bio * bio) |
1da177e4 LT |
770 | { |
771 | mddev_t *mddev = q->queuedata; | |
772 | conf_t *conf = mddev_to_conf(mddev); | |
773 | mirror_info_t *mirror; | |
774 | r1bio_t *r1_bio; | |
775 | struct bio *read_bio; | |
191ea9b2 | 776 | int i, targets = 0, disks; |
84255d10 | 777 | struct bitmap *bitmap; |
191ea9b2 N |
778 | unsigned long flags; |
779 | struct bio_list bl; | |
4b6d287f | 780 | struct page **behind_pages = NULL; |
a362357b | 781 | const int rw = bio_data_dir(bio); |
e3881a68 | 782 | const int do_sync = bio_sync(bio); |
c9959059 | 783 | int cpu, do_barriers; |
6bfe0b49 | 784 | mdk_rdev_t *blocked_rdev; |
191ea9b2 | 785 | |
1da177e4 LT |
786 | /* |
787 | * Register the new request and wait if the reconstruction | |
788 | * thread has put up a bar for new requests. | |
789 | * Continue immediately if no resync is active currently. | |
62de608d N |
790 | * We test barriers_work *after* md_write_start as md_write_start |
791 | * may cause the first superblock write, and that will check out | |
792 | * if barriers work. | |
1da177e4 | 793 | */ |
62de608d | 794 | |
3d310eb7 N |
795 | md_write_start(mddev, bio); /* wait on superblock update early */ |
796 | ||
62de608d N |
797 | if (unlikely(!mddev->barriers_work && bio_barrier(bio))) { |
798 | if (rw == WRITE) | |
799 | md_write_end(mddev); | |
6712ecf8 | 800 | bio_endio(bio, -EOPNOTSUPP); |
62de608d N |
801 | return 0; |
802 | } | |
803 | ||
17999be4 | 804 | wait_barrier(conf); |
1da177e4 | 805 | |
84255d10 N |
806 | bitmap = mddev->bitmap; |
807 | ||
074a7aca TH |
808 | cpu = part_stat_lock(); |
809 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
810 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
811 | bio_sectors(bio)); | |
812 | part_stat_unlock(); | |
1da177e4 LT |
813 | |
814 | /* | |
815 | * make_request() can abort the operation when READA is being | |
816 | * used and no empty request is available. | |
817 | * | |
818 | */ | |
819 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
820 | ||
821 | r1_bio->master_bio = bio; | |
822 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 823 | r1_bio->state = 0; |
1da177e4 LT |
824 | r1_bio->mddev = mddev; |
825 | r1_bio->sector = bio->bi_sector; | |
826 | ||
a362357b | 827 | if (rw == READ) { |
1da177e4 LT |
828 | /* |
829 | * read balancing logic: | |
830 | */ | |
831 | int rdisk = read_balance(conf, r1_bio); | |
832 | ||
833 | if (rdisk < 0) { | |
834 | /* couldn't find anywhere to read from */ | |
835 | raid_end_bio_io(r1_bio); | |
836 | return 0; | |
837 | } | |
838 | mirror = conf->mirrors + rdisk; | |
839 | ||
840 | r1_bio->read_disk = rdisk; | |
841 | ||
842 | read_bio = bio_clone(bio, GFP_NOIO); | |
843 | ||
844 | r1_bio->bios[rdisk] = read_bio; | |
845 | ||
846 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
847 | read_bio->bi_bdev = mirror->rdev->bdev; | |
848 | read_bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 849 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
850 | read_bio->bi_private = r1_bio; |
851 | ||
852 | generic_make_request(read_bio); | |
853 | return 0; | |
854 | } | |
855 | ||
856 | /* | |
857 | * WRITE: | |
858 | */ | |
859 | /* first select target devices under spinlock and | |
860 | * inc refcount on their rdev. Record them by setting | |
861 | * bios[x] to bio | |
862 | */ | |
863 | disks = conf->raid_disks; | |
191ea9b2 N |
864 | #if 0 |
865 | { static int first=1; | |
866 | if (first) printk("First Write sector %llu disks %d\n", | |
867 | (unsigned long long)r1_bio->sector, disks); | |
868 | first = 0; | |
869 | } | |
870 | #endif | |
6bfe0b49 DW |
871 | retry_write: |
872 | blocked_rdev = NULL; | |
1da177e4 LT |
873 | rcu_read_lock(); |
874 | for (i = 0; i < disks; i++) { | |
6bfe0b49 DW |
875 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
876 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
877 | atomic_inc(&rdev->nr_pending); | |
878 | blocked_rdev = rdev; | |
879 | break; | |
880 | } | |
881 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
1da177e4 | 882 | atomic_inc(&rdev->nr_pending); |
b2d444d7 | 883 | if (test_bit(Faulty, &rdev->flags)) { |
03c902e1 | 884 | rdev_dec_pending(rdev, mddev); |
1da177e4 LT |
885 | r1_bio->bios[i] = NULL; |
886 | } else | |
887 | r1_bio->bios[i] = bio; | |
191ea9b2 | 888 | targets++; |
1da177e4 LT |
889 | } else |
890 | r1_bio->bios[i] = NULL; | |
891 | } | |
892 | rcu_read_unlock(); | |
893 | ||
6bfe0b49 DW |
894 | if (unlikely(blocked_rdev)) { |
895 | /* Wait for this device to become unblocked */ | |
896 | int j; | |
897 | ||
898 | for (j = 0; j < i; j++) | |
899 | if (r1_bio->bios[j]) | |
900 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
901 | ||
902 | allow_barrier(conf); | |
903 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
904 | wait_barrier(conf); | |
905 | goto retry_write; | |
906 | } | |
907 | ||
4b6d287f N |
908 | BUG_ON(targets == 0); /* we never fail the last device */ |
909 | ||
191ea9b2 N |
910 | if (targets < conf->raid_disks) { |
911 | /* array is degraded, we will not clear the bitmap | |
912 | * on I/O completion (see raid1_end_write_request) */ | |
913 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
914 | } | |
915 | ||
4b6d287f N |
916 | /* do behind I/O ? */ |
917 | if (bitmap && | |
918 | atomic_read(&bitmap->behind_writes) < bitmap->max_write_behind && | |
919 | (behind_pages = alloc_behind_pages(bio)) != NULL) | |
920 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
921 | ||
191ea9b2 | 922 | atomic_set(&r1_bio->remaining, 0); |
4b6d287f | 923 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 924 | |
04b857f7 | 925 | do_barriers = bio_barrier(bio); |
a9701a30 N |
926 | if (do_barriers) |
927 | set_bit(R1BIO_Barrier, &r1_bio->state); | |
928 | ||
191ea9b2 | 929 | bio_list_init(&bl); |
1da177e4 LT |
930 | for (i = 0; i < disks; i++) { |
931 | struct bio *mbio; | |
932 | if (!r1_bio->bios[i]) | |
933 | continue; | |
934 | ||
935 | mbio = bio_clone(bio, GFP_NOIO); | |
936 | r1_bio->bios[i] = mbio; | |
937 | ||
938 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; | |
939 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
940 | mbio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 941 | mbio->bi_rw = WRITE | do_barriers | do_sync; |
1da177e4 LT |
942 | mbio->bi_private = r1_bio; |
943 | ||
4b6d287f N |
944 | if (behind_pages) { |
945 | struct bio_vec *bvec; | |
946 | int j; | |
947 | ||
948 | /* Yes, I really want the '__' version so that | |
949 | * we clear any unused pointer in the io_vec, rather | |
950 | * than leave them unchanged. This is important | |
951 | * because when we come to free the pages, we won't | |
952 | * know the originial bi_idx, so we just free | |
953 | * them all | |
954 | */ | |
955 | __bio_for_each_segment(bvec, mbio, j, 0) | |
956 | bvec->bv_page = behind_pages[j]; | |
957 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) | |
958 | atomic_inc(&r1_bio->behind_remaining); | |
959 | } | |
960 | ||
1da177e4 | 961 | atomic_inc(&r1_bio->remaining); |
1da177e4 | 962 | |
191ea9b2 | 963 | bio_list_add(&bl, mbio); |
1da177e4 | 964 | } |
4b6d287f | 965 | kfree(behind_pages); /* the behind pages are attached to the bios now */ |
1da177e4 | 966 | |
4b6d287f N |
967 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
968 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
191ea9b2 N |
969 | spin_lock_irqsave(&conf->device_lock, flags); |
970 | bio_list_merge(&conf->pending_bio_list, &bl); | |
971 | bio_list_init(&bl); | |
972 | ||
973 | blk_plug_device(mddev->queue); | |
974 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
975 | ||
a35e63ef N |
976 | /* In case raid1d snuck into freeze_array */ |
977 | wake_up(&conf->wait_barrier); | |
978 | ||
e3881a68 LE |
979 | if (do_sync) |
980 | md_wakeup_thread(mddev->thread); | |
191ea9b2 N |
981 | #if 0 |
982 | while ((bio = bio_list_pop(&bl)) != NULL) | |
983 | generic_make_request(bio); | |
984 | #endif | |
985 | ||
1da177e4 LT |
986 | return 0; |
987 | } | |
988 | ||
989 | static void status(struct seq_file *seq, mddev_t *mddev) | |
990 | { | |
991 | conf_t *conf = mddev_to_conf(mddev); | |
992 | int i; | |
993 | ||
994 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 995 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
996 | rcu_read_lock(); |
997 | for (i = 0; i < conf->raid_disks; i++) { | |
998 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 999 | seq_printf(seq, "%s", |
ddac7c7e N |
1000 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1001 | } | |
1002 | rcu_read_unlock(); | |
1da177e4 LT |
1003 | seq_printf(seq, "]"); |
1004 | } | |
1005 | ||
1006 | ||
1007 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1008 | { | |
1009 | char b[BDEVNAME_SIZE]; | |
1010 | conf_t *conf = mddev_to_conf(mddev); | |
1011 | ||
1012 | /* | |
1013 | * If it is not operational, then we have already marked it as dead | |
1014 | * else if it is the last working disks, ignore the error, let the | |
1015 | * next level up know. | |
1016 | * else mark the drive as failed | |
1017 | */ | |
b2d444d7 | 1018 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1019 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1020 | /* |
1021 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1022 | * normal single drive. |
1023 | * However don't try a recovery from this drive as | |
1024 | * it is very likely to fail. | |
1da177e4 | 1025 | */ |
4044ba58 | 1026 | mddev->recovery_disabled = 1; |
1da177e4 | 1027 | return; |
4044ba58 | 1028 | } |
c04be0aa N |
1029 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1030 | unsigned long flags; | |
1031 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1032 | mddev->degraded++; |
dd00a99e | 1033 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1034 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1035 | /* |
1036 | * if recovery is running, make sure it aborts. | |
1037 | */ | |
dfc70645 | 1038 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1039 | } else |
1040 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1041 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
d7a420c9 NA |
1042 | printk(KERN_ALERT "raid1: Disk failure on %s, disabling device.\n" |
1043 | "raid1: Operation continuing on %d devices.\n", | |
11ce99e6 | 1044 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | static void print_conf(conf_t *conf) | |
1048 | { | |
1049 | int i; | |
1da177e4 LT |
1050 | |
1051 | printk("RAID1 conf printout:\n"); | |
1052 | if (!conf) { | |
1053 | printk("(!conf)\n"); | |
1054 | return; | |
1055 | } | |
11ce99e6 | 1056 | printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1057 | conf->raid_disks); |
1058 | ||
ddac7c7e | 1059 | rcu_read_lock(); |
1da177e4 LT |
1060 | for (i = 0; i < conf->raid_disks; i++) { |
1061 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
1062 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1063 | if (rdev) | |
1da177e4 | 1064 | printk(" disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1065 | i, !test_bit(In_sync, &rdev->flags), |
1066 | !test_bit(Faulty, &rdev->flags), | |
1067 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1068 | } |
ddac7c7e | 1069 | rcu_read_unlock(); |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | static void close_sync(conf_t *conf) | |
1073 | { | |
17999be4 N |
1074 | wait_barrier(conf); |
1075 | allow_barrier(conf); | |
1da177e4 LT |
1076 | |
1077 | mempool_destroy(conf->r1buf_pool); | |
1078 | conf->r1buf_pool = NULL; | |
1079 | } | |
1080 | ||
1081 | static int raid1_spare_active(mddev_t *mddev) | |
1082 | { | |
1083 | int i; | |
1084 | conf_t *conf = mddev->private; | |
1da177e4 LT |
1085 | |
1086 | /* | |
1087 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1088 | * and mark them readable. |
1089 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1090 | */ |
1091 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1092 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1093 | if (rdev | |
1094 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa N |
1095 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
1096 | unsigned long flags; | |
1097 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1098 | mddev->degraded--; |
c04be0aa | 1099 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1100 | } |
1101 | } | |
1102 | ||
1103 | print_conf(conf); | |
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | ||
1108 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1109 | { | |
1110 | conf_t *conf = mddev->private; | |
199050ea | 1111 | int err = -EEXIST; |
41158c7e | 1112 | int mirror = 0; |
1da177e4 | 1113 | mirror_info_t *p; |
6c2fce2e NB |
1114 | int first = 0; |
1115 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1116 | |
6c2fce2e NB |
1117 | if (rdev->raid_disk >= 0) |
1118 | first = last = rdev->raid_disk; | |
1119 | ||
1120 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1121 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1122 | ||
1123 | blk_queue_stack_limits(mddev->queue, | |
1124 | rdev->bdev->bd_disk->queue); | |
1125 | /* as we don't honour merge_bvec_fn, we must never risk | |
1126 | * violating it, so limit ->max_sector to one PAGE, as | |
1127 | * a one page request is never in violation. | |
1128 | */ | |
1129 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1130 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1131 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1132 | ||
1133 | p->head_position = 0; | |
1134 | rdev->raid_disk = mirror; | |
199050ea | 1135 | err = 0; |
6aea114a N |
1136 | /* As all devices are equivalent, we don't need a full recovery |
1137 | * if this was recently any drive of the array | |
1138 | */ | |
1139 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1140 | conf->fullsync = 1; |
d6065f7b | 1141 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1142 | break; |
1143 | } | |
1144 | ||
1145 | print_conf(conf); | |
199050ea | 1146 | return err; |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1150 | { | |
1151 | conf_t *conf = mddev->private; | |
1152 | int err = 0; | |
1153 | mdk_rdev_t *rdev; | |
1154 | mirror_info_t *p = conf->mirrors+ number; | |
1155 | ||
1156 | print_conf(conf); | |
1157 | rdev = p->rdev; | |
1158 | if (rdev) { | |
b2d444d7 | 1159 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1160 | atomic_read(&rdev->nr_pending)) { |
1161 | err = -EBUSY; | |
1162 | goto abort; | |
1163 | } | |
dfc70645 N |
1164 | /* Only remove non-faulty devices is recovery |
1165 | * is not possible. | |
1166 | */ | |
1167 | if (!test_bit(Faulty, &rdev->flags) && | |
1168 | mddev->degraded < conf->raid_disks) { | |
1169 | err = -EBUSY; | |
1170 | goto abort; | |
1171 | } | |
1da177e4 | 1172 | p->rdev = NULL; |
fbd568a3 | 1173 | synchronize_rcu(); |
1da177e4 LT |
1174 | if (atomic_read(&rdev->nr_pending)) { |
1175 | /* lost the race, try later */ | |
1176 | err = -EBUSY; | |
1177 | p->rdev = rdev; | |
1178 | } | |
1179 | } | |
1180 | abort: | |
1181 | ||
1182 | print_conf(conf); | |
1183 | return err; | |
1184 | } | |
1185 | ||
1186 | ||
6712ecf8 | 1187 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1188 | { |
1da177e4 | 1189 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
d11c171e | 1190 | int i; |
1da177e4 | 1191 | |
d11c171e N |
1192 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1193 | if (r1_bio->bios[i] == bio) | |
1194 | break; | |
1195 | BUG_ON(i < 0); | |
1196 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1197 | /* |
1198 | * we have read a block, now it needs to be re-written, | |
1199 | * or re-read if the read failed. | |
1200 | * We don't do much here, just schedule handling by raid1d | |
1201 | */ | |
69382e85 | 1202 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1203 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1204 | |
1205 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1206 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1207 | } |
1208 | ||
6712ecf8 | 1209 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1210 | { |
1211 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1212 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
1213 | mddev_t *mddev = r1_bio->mddev; | |
1214 | conf_t *conf = mddev_to_conf(mddev); | |
1215 | int i; | |
1216 | int mirror=0; | |
1217 | ||
1da177e4 LT |
1218 | for (i = 0; i < conf->raid_disks; i++) |
1219 | if (r1_bio->bios[i] == bio) { | |
1220 | mirror = i; | |
1221 | break; | |
1222 | } | |
6b1117d5 N |
1223 | if (!uptodate) { |
1224 | int sync_blocks = 0; | |
1225 | sector_t s = r1_bio->sector; | |
1226 | long sectors_to_go = r1_bio->sectors; | |
1227 | /* make sure these bits doesn't get cleared. */ | |
1228 | do { | |
5e3db645 | 1229 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1230 | &sync_blocks, 1); |
1231 | s += sync_blocks; | |
1232 | sectors_to_go -= sync_blocks; | |
1233 | } while (sectors_to_go > 0); | |
1da177e4 | 1234 | md_error(mddev, conf->mirrors[mirror].rdev); |
6b1117d5 | 1235 | } |
e3b9703e | 1236 | |
1da177e4 LT |
1237 | update_head_pos(mirror, r1_bio); |
1238 | ||
1239 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
73d5c38a | 1240 | sector_t s = r1_bio->sectors; |
1da177e4 | 1241 | put_buf(r1_bio); |
73d5c38a | 1242 | md_done_sync(mddev, s, uptodate); |
1da177e4 | 1243 | } |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1247 | { | |
1248 | conf_t *conf = mddev_to_conf(mddev); | |
1249 | int i; | |
1250 | int disks = conf->raid_disks; | |
1251 | struct bio *bio, *wbio; | |
1252 | ||
1253 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1254 | ||
69382e85 | 1255 | |
d11c171e N |
1256 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
1257 | /* We have read all readable devices. If we haven't | |
1258 | * got the block, then there is no hope left. | |
1259 | * If we have, then we want to do a comparison | |
1260 | * and skip the write if everything is the same. | |
1261 | * If any blocks failed to read, then we need to | |
1262 | * attempt an over-write | |
1263 | */ | |
1264 | int primary; | |
1265 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
1266 | for (i=0; i<mddev->raid_disks; i++) | |
1267 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) | |
1268 | md_error(mddev, conf->mirrors[i].rdev); | |
1269 | ||
1270 | md_done_sync(mddev, r1_bio->sectors, 1); | |
1271 | put_buf(r1_bio); | |
1272 | return; | |
1273 | } | |
1274 | for (primary=0; primary<mddev->raid_disks; primary++) | |
1275 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && | |
1276 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1277 | r1_bio->bios[primary]->bi_end_io = NULL; | |
03c902e1 | 1278 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); |
d11c171e N |
1279 | break; |
1280 | } | |
1281 | r1_bio->read_disk = primary; | |
1282 | for (i=0; i<mddev->raid_disks; i++) | |
ed456662 | 1283 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) { |
d11c171e N |
1284 | int j; |
1285 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1286 | struct bio *pbio = r1_bio->bios[primary]; | |
1287 | struct bio *sbio = r1_bio->bios[i]; | |
ed456662 MA |
1288 | |
1289 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1290 | for (j = vcnt; j-- ; ) { | |
1291 | struct page *p, *s; | |
1292 | p = pbio->bi_io_vec[j].bv_page; | |
1293 | s = sbio->bi_io_vec[j].bv_page; | |
1294 | if (memcmp(page_address(p), | |
1295 | page_address(s), | |
1296 | PAGE_SIZE)) | |
1297 | break; | |
1298 | } | |
1299 | } else | |
1300 | j = 0; | |
d11c171e N |
1301 | if (j >= 0) |
1302 | mddev->resync_mismatches += r1_bio->sectors; | |
cf7a4416 N |
1303 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1304 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
d11c171e | 1305 | sbio->bi_end_io = NULL; |
03c902e1 N |
1306 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); |
1307 | } else { | |
d11c171e | 1308 | /* fixup the bio for reuse */ |
698b18c1 | 1309 | int size; |
d11c171e N |
1310 | sbio->bi_vcnt = vcnt; |
1311 | sbio->bi_size = r1_bio->sectors << 9; | |
1312 | sbio->bi_idx = 0; | |
1313 | sbio->bi_phys_segments = 0; | |
d11c171e N |
1314 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); |
1315 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1316 | sbio->bi_next = NULL; | |
1317 | sbio->bi_sector = r1_bio->sector + | |
1318 | conf->mirrors[i].rdev->data_offset; | |
1319 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
698b18c1 N |
1320 | size = sbio->bi_size; |
1321 | for (j = 0; j < vcnt ; j++) { | |
1322 | struct bio_vec *bi; | |
1323 | bi = &sbio->bi_io_vec[j]; | |
1324 | bi->bv_offset = 0; | |
1325 | if (size > PAGE_SIZE) | |
1326 | bi->bv_len = PAGE_SIZE; | |
1327 | else | |
1328 | bi->bv_len = size; | |
1329 | size -= PAGE_SIZE; | |
1330 | memcpy(page_address(bi->bv_page), | |
3eda22d1 N |
1331 | page_address(pbio->bi_io_vec[j].bv_page), |
1332 | PAGE_SIZE); | |
698b18c1 | 1333 | } |
3eda22d1 | 1334 | |
d11c171e N |
1335 | } |
1336 | } | |
1337 | } | |
1da177e4 | 1338 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
69382e85 N |
1339 | /* ouch - failed to read all of that. |
1340 | * Try some synchronous reads of other devices to get | |
1341 | * good data, much like with normal read errors. Only | |
ddac7c7e | 1342 | * read into the pages we already have so we don't |
69382e85 N |
1343 | * need to re-issue the read request. |
1344 | * We don't need to freeze the array, because being in an | |
1345 | * active sync request, there is no normal IO, and | |
1346 | * no overlapping syncs. | |
1da177e4 | 1347 | */ |
69382e85 N |
1348 | sector_t sect = r1_bio->sector; |
1349 | int sectors = r1_bio->sectors; | |
1350 | int idx = 0; | |
1351 | ||
1352 | while(sectors) { | |
1353 | int s = sectors; | |
1354 | int d = r1_bio->read_disk; | |
1355 | int success = 0; | |
1356 | mdk_rdev_t *rdev; | |
1357 | ||
1358 | if (s > (PAGE_SIZE>>9)) | |
1359 | s = PAGE_SIZE >> 9; | |
1360 | do { | |
1361 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
ddac7c7e N |
1362 | /* No rcu protection needed here devices |
1363 | * can only be removed when no resync is | |
1364 | * active, and resync is currently active | |
1365 | */ | |
69382e85 N |
1366 | rdev = conf->mirrors[d].rdev; |
1367 | if (sync_page_io(rdev->bdev, | |
1368 | sect + rdev->data_offset, | |
1369 | s<<9, | |
1370 | bio->bi_io_vec[idx].bv_page, | |
1371 | READ)) { | |
1372 | success = 1; | |
1373 | break; | |
1374 | } | |
1375 | } | |
1376 | d++; | |
1377 | if (d == conf->raid_disks) | |
1378 | d = 0; | |
1379 | } while (!success && d != r1_bio->read_disk); | |
1380 | ||
1381 | if (success) { | |
097426f6 | 1382 | int start = d; |
69382e85 N |
1383 | /* write it back and re-read */ |
1384 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
1385 | while (d != r1_bio->read_disk) { | |
1386 | if (d == 0) | |
1387 | d = conf->raid_disks; | |
1388 | d--; | |
1389 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1390 | continue; | |
1391 | rdev = conf->mirrors[d].rdev; | |
4dbcdc75 | 1392 | atomic_add(s, &rdev->corrected_errors); |
69382e85 N |
1393 | if (sync_page_io(rdev->bdev, |
1394 | sect + rdev->data_offset, | |
1395 | s<<9, | |
1396 | bio->bi_io_vec[idx].bv_page, | |
097426f6 N |
1397 | WRITE) == 0) |
1398 | md_error(mddev, rdev); | |
1399 | } | |
1400 | d = start; | |
1401 | while (d != r1_bio->read_disk) { | |
1402 | if (d == 0) | |
1403 | d = conf->raid_disks; | |
1404 | d--; | |
1405 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1406 | continue; | |
1407 | rdev = conf->mirrors[d].rdev; | |
1408 | if (sync_page_io(rdev->bdev, | |
69382e85 N |
1409 | sect + rdev->data_offset, |
1410 | s<<9, | |
1411 | bio->bi_io_vec[idx].bv_page, | |
097426f6 | 1412 | READ) == 0) |
69382e85 | 1413 | md_error(mddev, rdev); |
69382e85 N |
1414 | } |
1415 | } else { | |
1416 | char b[BDEVNAME_SIZE]; | |
1417 | /* Cannot read from anywhere, array is toast */ | |
1418 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1419 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" | |
1420 | " for block %llu\n", | |
1421 | bdevname(bio->bi_bdev,b), | |
1422 | (unsigned long long)r1_bio->sector); | |
1423 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1424 | put_buf(r1_bio); | |
1425 | return; | |
1426 | } | |
1427 | sectors -= s; | |
1428 | sect += s; | |
1429 | idx ++; | |
1430 | } | |
1da177e4 | 1431 | } |
d11c171e N |
1432 | |
1433 | /* | |
1434 | * schedule writes | |
1435 | */ | |
1da177e4 LT |
1436 | atomic_set(&r1_bio->remaining, 1); |
1437 | for (i = 0; i < disks ; i++) { | |
1438 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1439 | if (wbio->bi_end_io == NULL || |
1440 | (wbio->bi_end_io == end_sync_read && | |
1441 | (i == r1_bio->read_disk || | |
1442 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1443 | continue; |
1444 | ||
3e198f78 N |
1445 | wbio->bi_rw = WRITE; |
1446 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1447 | atomic_inc(&r1_bio->remaining); |
1448 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1449 | |
1da177e4 LT |
1450 | generic_make_request(wbio); |
1451 | } | |
1452 | ||
1453 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1454 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1455 | md_done_sync(mddev, r1_bio->sectors, 1); |
1456 | put_buf(r1_bio); | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | /* | |
1461 | * This is a kernel thread which: | |
1462 | * | |
1463 | * 1. Retries failed read operations on working mirrors. | |
1464 | * 2. Updates the raid superblock when problems encounter. | |
1465 | * 3. Performs writes following reads for array syncronising. | |
1466 | */ | |
1467 | ||
867868fb N |
1468 | static void fix_read_error(conf_t *conf, int read_disk, |
1469 | sector_t sect, int sectors) | |
1470 | { | |
1471 | mddev_t *mddev = conf->mddev; | |
1472 | while(sectors) { | |
1473 | int s = sectors; | |
1474 | int d = read_disk; | |
1475 | int success = 0; | |
1476 | int start; | |
1477 | mdk_rdev_t *rdev; | |
1478 | ||
1479 | if (s > (PAGE_SIZE>>9)) | |
1480 | s = PAGE_SIZE >> 9; | |
1481 | ||
1482 | do { | |
1483 | /* Note: no rcu protection needed here | |
1484 | * as this is synchronous in the raid1d thread | |
1485 | * which is the thread that might remove | |
1486 | * a device. If raid1d ever becomes multi-threaded.... | |
1487 | */ | |
1488 | rdev = conf->mirrors[d].rdev; | |
1489 | if (rdev && | |
1490 | test_bit(In_sync, &rdev->flags) && | |
1491 | sync_page_io(rdev->bdev, | |
1492 | sect + rdev->data_offset, | |
1493 | s<<9, | |
1494 | conf->tmppage, READ)) | |
1495 | success = 1; | |
1496 | else { | |
1497 | d++; | |
1498 | if (d == conf->raid_disks) | |
1499 | d = 0; | |
1500 | } | |
1501 | } while (!success && d != read_disk); | |
1502 | ||
1503 | if (!success) { | |
1504 | /* Cannot read from anywhere -- bye bye array */ | |
1505 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1506 | break; | |
1507 | } | |
1508 | /* write it back and re-read */ | |
1509 | start = d; | |
1510 | while (d != read_disk) { | |
1511 | if (d==0) | |
1512 | d = conf->raid_disks; | |
1513 | d--; | |
1514 | rdev = conf->mirrors[d].rdev; | |
1515 | if (rdev && | |
1516 | test_bit(In_sync, &rdev->flags)) { | |
1517 | if (sync_page_io(rdev->bdev, | |
1518 | sect + rdev->data_offset, | |
1519 | s<<9, conf->tmppage, WRITE) | |
1520 | == 0) | |
1521 | /* Well, this device is dead */ | |
1522 | md_error(mddev, rdev); | |
1523 | } | |
1524 | } | |
1525 | d = start; | |
1526 | while (d != read_disk) { | |
1527 | char b[BDEVNAME_SIZE]; | |
1528 | if (d==0) | |
1529 | d = conf->raid_disks; | |
1530 | d--; | |
1531 | rdev = conf->mirrors[d].rdev; | |
1532 | if (rdev && | |
1533 | test_bit(In_sync, &rdev->flags)) { | |
1534 | if (sync_page_io(rdev->bdev, | |
1535 | sect + rdev->data_offset, | |
1536 | s<<9, conf->tmppage, READ) | |
1537 | == 0) | |
1538 | /* Well, this device is dead */ | |
1539 | md_error(mddev, rdev); | |
1540 | else { | |
1541 | atomic_add(s, &rdev->corrected_errors); | |
1542 | printk(KERN_INFO | |
1543 | "raid1:%s: read error corrected " | |
1544 | "(%d sectors at %llu on %s)\n", | |
1545 | mdname(mddev), s, | |
969b755a RD |
1546 | (unsigned long long)(sect + |
1547 | rdev->data_offset), | |
867868fb N |
1548 | bdevname(rdev->bdev, b)); |
1549 | } | |
1550 | } | |
1551 | } | |
1552 | sectors -= s; | |
1553 | sect += s; | |
1554 | } | |
1555 | } | |
1556 | ||
1da177e4 LT |
1557 | static void raid1d(mddev_t *mddev) |
1558 | { | |
1559 | r1bio_t *r1_bio; | |
1560 | struct bio *bio; | |
1561 | unsigned long flags; | |
1562 | conf_t *conf = mddev_to_conf(mddev); | |
1563 | struct list_head *head = &conf->retry_list; | |
1564 | int unplug=0; | |
1565 | mdk_rdev_t *rdev; | |
1566 | ||
1567 | md_check_recovery(mddev); | |
1da177e4 LT |
1568 | |
1569 | for (;;) { | |
1570 | char b[BDEVNAME_SIZE]; | |
191ea9b2 | 1571 | |
a35e63ef | 1572 | unplug += flush_pending_writes(conf); |
191ea9b2 | 1573 | |
a35e63ef N |
1574 | spin_lock_irqsave(&conf->device_lock, flags); |
1575 | if (list_empty(head)) { | |
1576 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 1577 | break; |
a35e63ef | 1578 | } |
1da177e4 LT |
1579 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
1580 | list_del(head->prev); | |
ddaf22ab | 1581 | conf->nr_queued--; |
1da177e4 LT |
1582 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1583 | ||
1584 | mddev = r1_bio->mddev; | |
1585 | conf = mddev_to_conf(mddev); | |
1586 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { | |
1587 | sync_request_write(mddev, r1_bio); | |
1588 | unplug = 1; | |
a9701a30 N |
1589 | } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) { |
1590 | /* some requests in the r1bio were BIO_RW_BARRIER | |
bea27718 | 1591 | * requests which failed with -EOPNOTSUPP. Hohumm.. |
a9701a30 N |
1592 | * Better resubmit without the barrier. |
1593 | * We know which devices to resubmit for, because | |
1594 | * all others have had their bios[] entry cleared. | |
5e7dd2ab | 1595 | * We already have a nr_pending reference on these rdevs. |
a9701a30 N |
1596 | */ |
1597 | int i; | |
e3881a68 | 1598 | const int do_sync = bio_sync(r1_bio->master_bio); |
a9701a30 N |
1599 | clear_bit(R1BIO_BarrierRetry, &r1_bio->state); |
1600 | clear_bit(R1BIO_Barrier, &r1_bio->state); | |
2f889129 N |
1601 | for (i=0; i < conf->raid_disks; i++) |
1602 | if (r1_bio->bios[i]) | |
1603 | atomic_inc(&r1_bio->remaining); | |
a9701a30 N |
1604 | for (i=0; i < conf->raid_disks; i++) |
1605 | if (r1_bio->bios[i]) { | |
1606 | struct bio_vec *bvec; | |
1607 | int j; | |
1608 | ||
1609 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1610 | /* copy pages from the failed bio, as | |
1611 | * this might be a write-behind device */ | |
1612 | __bio_for_each_segment(bvec, bio, j, 0) | |
1613 | bvec->bv_page = bio_iovec_idx(r1_bio->bios[i], j)->bv_page; | |
1614 | bio_put(r1_bio->bios[i]); | |
1615 | bio->bi_sector = r1_bio->sector + | |
1616 | conf->mirrors[i].rdev->data_offset; | |
1617 | bio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1618 | bio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 1619 | bio->bi_rw = WRITE | do_sync; |
a9701a30 N |
1620 | bio->bi_private = r1_bio; |
1621 | r1_bio->bios[i] = bio; | |
1622 | generic_make_request(bio); | |
1623 | } | |
1da177e4 LT |
1624 | } else { |
1625 | int disk; | |
ddaf22ab N |
1626 | |
1627 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1628 | * the block and we can fix it. | |
1629 | * We freeze all other IO, and try reading the block from | |
1630 | * other devices. When we find one, we re-write | |
1631 | * and check it that fixes the read error. | |
1632 | * This is all done synchronously while the array is | |
1633 | * frozen | |
1634 | */ | |
867868fb N |
1635 | if (mddev->ro == 0) { |
1636 | freeze_array(conf); | |
1637 | fix_read_error(conf, r1_bio->read_disk, | |
1638 | r1_bio->sector, | |
1639 | r1_bio->sectors); | |
1640 | unfreeze_array(conf); | |
ddaf22ab N |
1641 | } |
1642 | ||
1da177e4 | 1643 | bio = r1_bio->bios[r1_bio->read_disk]; |
4706b349 N |
1644 | if ((disk=read_balance(conf, r1_bio)) == -1 || |
1645 | disk == r1_bio->read_disk) { | |
1da177e4 LT |
1646 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O" |
1647 | " read error for block %llu\n", | |
1648 | bdevname(bio->bi_bdev,b), | |
1649 | (unsigned long long)r1_bio->sector); | |
1650 | raid_end_bio_io(r1_bio); | |
1651 | } else { | |
e3881a68 | 1652 | const int do_sync = bio_sync(r1_bio->master_bio); |
cf30a473 N |
1653 | r1_bio->bios[r1_bio->read_disk] = |
1654 | mddev->ro ? IO_BLOCKED : NULL; | |
1da177e4 LT |
1655 | r1_bio->read_disk = disk; |
1656 | bio_put(bio); | |
1657 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1658 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1659 | rdev = conf->mirrors[disk].rdev; | |
1660 | if (printk_ratelimit()) | |
1661 | printk(KERN_ERR "raid1: %s: redirecting sector %llu to" | |
1662 | " another mirror\n", | |
1663 | bdevname(rdev->bdev,b), | |
1664 | (unsigned long long)r1_bio->sector); | |
1665 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1666 | bio->bi_bdev = rdev->bdev; | |
1667 | bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 1668 | bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1669 | bio->bi_private = r1_bio; |
1670 | unplug = 1; | |
1671 | generic_make_request(bio); | |
1672 | } | |
1673 | } | |
1674 | } | |
1da177e4 LT |
1675 | if (unplug) |
1676 | unplug_slaves(mddev); | |
1677 | } | |
1678 | ||
1679 | ||
1680 | static int init_resync(conf_t *conf) | |
1681 | { | |
1682 | int buffs; | |
1683 | ||
1684 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 1685 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
1686 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
1687 | conf->poolinfo); | |
1688 | if (!conf->r1buf_pool) | |
1689 | return -ENOMEM; | |
1690 | conf->next_resync = 0; | |
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * perform a "sync" on one "block" | |
1696 | * | |
1697 | * We need to make sure that no normal I/O request - particularly write | |
1698 | * requests - conflict with active sync requests. | |
1699 | * | |
1700 | * This is achieved by tracking pending requests and a 'barrier' concept | |
1701 | * that can be installed to exclude normal IO requests. | |
1702 | */ | |
1703 | ||
57afd89f | 1704 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 LT |
1705 | { |
1706 | conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
1707 | r1bio_t *r1_bio; |
1708 | struct bio *bio; | |
1709 | sector_t max_sector, nr_sectors; | |
3e198f78 | 1710 | int disk = -1; |
1da177e4 | 1711 | int i; |
3e198f78 N |
1712 | int wonly = -1; |
1713 | int write_targets = 0, read_targets = 0; | |
191ea9b2 | 1714 | int sync_blocks; |
e3b9703e | 1715 | int still_degraded = 0; |
1da177e4 LT |
1716 | |
1717 | if (!conf->r1buf_pool) | |
191ea9b2 N |
1718 | { |
1719 | /* | |
1720 | printk("sync start - bitmap %p\n", mddev->bitmap); | |
1721 | */ | |
1da177e4 | 1722 | if (init_resync(conf)) |
57afd89f | 1723 | return 0; |
191ea9b2 | 1724 | } |
1da177e4 LT |
1725 | |
1726 | max_sector = mddev->size << 1; | |
1727 | if (sector_nr >= max_sector) { | |
191ea9b2 N |
1728 | /* If we aborted, we need to abort the |
1729 | * sync on the 'current' bitmap chunk (there will | |
1730 | * only be one in raid1 resync. | |
1731 | * We can find the current addess in mddev->curr_resync | |
1732 | */ | |
6a806c51 N |
1733 | if (mddev->curr_resync < max_sector) /* aborted */ |
1734 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 1735 | &sync_blocks, 1); |
6a806c51 | 1736 | else /* completed sync */ |
191ea9b2 | 1737 | conf->fullsync = 0; |
6a806c51 N |
1738 | |
1739 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
1740 | close_sync(conf); |
1741 | return 0; | |
1742 | } | |
1743 | ||
07d84d10 N |
1744 | if (mddev->bitmap == NULL && |
1745 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 1746 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
1747 | conf->fullsync == 0) { |
1748 | *skipped = 1; | |
1749 | return max_sector - sector_nr; | |
1750 | } | |
6394cca5 N |
1751 | /* before building a request, check if we can skip these blocks.. |
1752 | * This call the bitmap_start_sync doesn't actually record anything | |
1753 | */ | |
e3b9703e | 1754 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 1755 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
1756 | /* We can skip this block, and probably several more */ |
1757 | *skipped = 1; | |
1758 | return sync_blocks; | |
1759 | } | |
1da177e4 | 1760 | /* |
17999be4 N |
1761 | * If there is non-resync activity waiting for a turn, |
1762 | * and resync is going fast enough, | |
1763 | * then let it though before starting on this new sync request. | |
1da177e4 | 1764 | */ |
17999be4 | 1765 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 1766 | msleep_interruptible(1000); |
17999be4 | 1767 | |
b47490c9 | 1768 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
17999be4 N |
1769 | raise_barrier(conf); |
1770 | ||
1771 | conf->next_resync = sector_nr; | |
1da177e4 | 1772 | |
3e198f78 N |
1773 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
1774 | rcu_read_lock(); | |
1da177e4 | 1775 | /* |
3e198f78 N |
1776 | * If we get a correctably read error during resync or recovery, |
1777 | * we might want to read from a different device. So we | |
1778 | * flag all drives that could conceivably be read from for READ, | |
1779 | * and any others (which will be non-In_sync devices) for WRITE. | |
1780 | * If a read fails, we try reading from something else for which READ | |
1781 | * is OK. | |
1da177e4 | 1782 | */ |
1da177e4 | 1783 | |
1da177e4 LT |
1784 | r1_bio->mddev = mddev; |
1785 | r1_bio->sector = sector_nr; | |
191ea9b2 | 1786 | r1_bio->state = 0; |
1da177e4 | 1787 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
1788 | |
1789 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 1790 | mdk_rdev_t *rdev; |
1da177e4 LT |
1791 | bio = r1_bio->bios[i]; |
1792 | ||
1793 | /* take from bio_init */ | |
1794 | bio->bi_next = NULL; | |
1795 | bio->bi_flags |= 1 << BIO_UPTODATE; | |
802ba064 | 1796 | bio->bi_rw = READ; |
1da177e4 LT |
1797 | bio->bi_vcnt = 0; |
1798 | bio->bi_idx = 0; | |
1799 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
1800 | bio->bi_size = 0; |
1801 | bio->bi_end_io = NULL; | |
1802 | bio->bi_private = NULL; | |
1803 | ||
3e198f78 N |
1804 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
1805 | if (rdev == NULL || | |
1806 | test_bit(Faulty, &rdev->flags)) { | |
e3b9703e N |
1807 | still_degraded = 1; |
1808 | continue; | |
3e198f78 | 1809 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
1810 | bio->bi_rw = WRITE; |
1811 | bio->bi_end_io = end_sync_write; | |
1812 | write_targets ++; | |
3e198f78 N |
1813 | } else { |
1814 | /* may need to read from here */ | |
1815 | bio->bi_rw = READ; | |
1816 | bio->bi_end_io = end_sync_read; | |
1817 | if (test_bit(WriteMostly, &rdev->flags)) { | |
1818 | if (wonly < 0) | |
1819 | wonly = i; | |
1820 | } else { | |
1821 | if (disk < 0) | |
1822 | disk = i; | |
1823 | } | |
1824 | read_targets++; | |
1825 | } | |
1826 | atomic_inc(&rdev->nr_pending); | |
1827 | bio->bi_sector = sector_nr + rdev->data_offset; | |
1828 | bio->bi_bdev = rdev->bdev; | |
1da177e4 LT |
1829 | bio->bi_private = r1_bio; |
1830 | } | |
3e198f78 N |
1831 | rcu_read_unlock(); |
1832 | if (disk < 0) | |
1833 | disk = wonly; | |
1834 | r1_bio->read_disk = disk; | |
191ea9b2 | 1835 | |
3e198f78 N |
1836 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
1837 | /* extra read targets are also write targets */ | |
1838 | write_targets += read_targets-1; | |
1839 | ||
1840 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
1841 | /* There is nowhere to write, so all non-sync |
1842 | * drives must be failed - so we are finished | |
1843 | */ | |
57afd89f N |
1844 | sector_t rv = max_sector - sector_nr; |
1845 | *skipped = 1; | |
1da177e4 | 1846 | put_buf(r1_bio); |
1da177e4 LT |
1847 | return rv; |
1848 | } | |
1849 | ||
c6207277 N |
1850 | if (max_sector > mddev->resync_max) |
1851 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
1da177e4 | 1852 | nr_sectors = 0; |
289e99e8 | 1853 | sync_blocks = 0; |
1da177e4 LT |
1854 | do { |
1855 | struct page *page; | |
1856 | int len = PAGE_SIZE; | |
1857 | if (sector_nr + (len>>9) > max_sector) | |
1858 | len = (max_sector - sector_nr) << 9; | |
1859 | if (len == 0) | |
1860 | break; | |
6a806c51 N |
1861 | if (sync_blocks == 0) { |
1862 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
1863 | &sync_blocks, still_degraded) && |
1864 | !conf->fullsync && | |
1865 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 1866 | break; |
9e77c485 | 1867 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
6a806c51 N |
1868 | if (len > (sync_blocks<<9)) |
1869 | len = sync_blocks<<9; | |
ab7a30c7 | 1870 | } |
191ea9b2 | 1871 | |
1da177e4 LT |
1872 | for (i=0 ; i < conf->raid_disks; i++) { |
1873 | bio = r1_bio->bios[i]; | |
1874 | if (bio->bi_end_io) { | |
d11c171e | 1875 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
1876 | if (bio_add_page(bio, page, len, 0) == 0) { |
1877 | /* stop here */ | |
d11c171e | 1878 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
1879 | while (i > 0) { |
1880 | i--; | |
1881 | bio = r1_bio->bios[i]; | |
6a806c51 N |
1882 | if (bio->bi_end_io==NULL) |
1883 | continue; | |
1da177e4 LT |
1884 | /* remove last page from this bio */ |
1885 | bio->bi_vcnt--; | |
1886 | bio->bi_size -= len; | |
1887 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1888 | } | |
1889 | goto bio_full; | |
1890 | } | |
1891 | } | |
1892 | } | |
1893 | nr_sectors += len>>9; | |
1894 | sector_nr += len>>9; | |
191ea9b2 | 1895 | sync_blocks -= (len>>9); |
1da177e4 LT |
1896 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1897 | bio_full: | |
1da177e4 LT |
1898 | r1_bio->sectors = nr_sectors; |
1899 | ||
d11c171e N |
1900 | /* For a user-requested sync, we read all readable devices and do a |
1901 | * compare | |
1902 | */ | |
1903 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1904 | atomic_set(&r1_bio->remaining, read_targets); | |
1905 | for (i=0; i<conf->raid_disks; i++) { | |
1906 | bio = r1_bio->bios[i]; | |
1907 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 1908 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
1909 | generic_make_request(bio); |
1910 | } | |
1911 | } | |
1912 | } else { | |
1913 | atomic_set(&r1_bio->remaining, 1); | |
1914 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 1915 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 1916 | generic_make_request(bio); |
1da177e4 | 1917 | |
d11c171e | 1918 | } |
1da177e4 LT |
1919 | return nr_sectors; |
1920 | } | |
1921 | ||
1922 | static int run(mddev_t *mddev) | |
1923 | { | |
1924 | conf_t *conf; | |
1925 | int i, j, disk_idx; | |
1926 | mirror_info_t *disk; | |
1927 | mdk_rdev_t *rdev; | |
1da177e4 LT |
1928 | |
1929 | if (mddev->level != 1) { | |
1930 | printk("raid1: %s: raid level not set to mirroring (%d)\n", | |
1931 | mdname(mddev), mddev->level); | |
1932 | goto out; | |
1933 | } | |
f6705578 N |
1934 | if (mddev->reshape_position != MaxSector) { |
1935 | printk("raid1: %s: reshape_position set but not supported\n", | |
1936 | mdname(mddev)); | |
1937 | goto out; | |
1938 | } | |
1da177e4 LT |
1939 | /* |
1940 | * copy the already verified devices into our private RAID1 | |
1941 | * bookkeeping area. [whatever we allocate in run(), | |
1942 | * should be freed in stop()] | |
1943 | */ | |
9ffae0cf | 1944 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 LT |
1945 | mddev->private = conf; |
1946 | if (!conf) | |
1947 | goto out_no_mem; | |
1948 | ||
9ffae0cf | 1949 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
1950 | GFP_KERNEL); |
1951 | if (!conf->mirrors) | |
1952 | goto out_no_mem; | |
1953 | ||
ddaf22ab N |
1954 | conf->tmppage = alloc_page(GFP_KERNEL); |
1955 | if (!conf->tmppage) | |
1956 | goto out_no_mem; | |
1957 | ||
1da177e4 LT |
1958 | conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1959 | if (!conf->poolinfo) | |
1960 | goto out_no_mem; | |
1961 | conf->poolinfo->mddev = mddev; | |
1962 | conf->poolinfo->raid_disks = mddev->raid_disks; | |
1963 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
1964 | r1bio_pool_free, | |
1965 | conf->poolinfo); | |
1966 | if (!conf->r1bio_pool) | |
1967 | goto out_no_mem; | |
1968 | ||
e7e72bf6 NB |
1969 | spin_lock_init(&conf->device_lock); |
1970 | mddev->queue->queue_lock = &conf->device_lock; | |
1971 | ||
159ec1fc | 1972 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
1973 | disk_idx = rdev->raid_disk; |
1974 | if (disk_idx >= mddev->raid_disks | |
1975 | || disk_idx < 0) | |
1976 | continue; | |
1977 | disk = conf->mirrors + disk_idx; | |
1978 | ||
1979 | disk->rdev = rdev; | |
1980 | ||
1981 | blk_queue_stack_limits(mddev->queue, | |
1982 | rdev->bdev->bd_disk->queue); | |
1983 | /* as we don't honour merge_bvec_fn, we must never risk | |
1984 | * violating it, so limit ->max_sector to one PAGE, as | |
1985 | * a one page request is never in violation. | |
1986 | */ | |
1987 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1988 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1989 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1990 | ||
1991 | disk->head_position = 0; | |
1da177e4 LT |
1992 | } |
1993 | conf->raid_disks = mddev->raid_disks; | |
1994 | conf->mddev = mddev; | |
1da177e4 | 1995 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
1996 | |
1997 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 1998 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 1999 | |
191ea9b2 N |
2000 | bio_list_init(&conf->pending_bio_list); |
2001 | bio_list_init(&conf->flushing_bio_list); | |
2002 | ||
1da177e4 LT |
2003 | |
2004 | mddev->degraded = 0; | |
2005 | for (i = 0; i < conf->raid_disks; i++) { | |
2006 | ||
2007 | disk = conf->mirrors + i; | |
2008 | ||
5fd6c1dc N |
2009 | if (!disk->rdev || |
2010 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 LT |
2011 | disk->head_position = 0; |
2012 | mddev->degraded++; | |
918f0238 N |
2013 | if (disk->rdev) |
2014 | conf->fullsync = 1; | |
1da177e4 LT |
2015 | } |
2016 | } | |
11ce99e6 N |
2017 | if (mddev->degraded == conf->raid_disks) { |
2018 | printk(KERN_ERR "raid1: no operational mirrors for %s\n", | |
2019 | mdname(mddev)); | |
2020 | goto out_free_conf; | |
2021 | } | |
2022 | if (conf->raid_disks - mddev->degraded == 1) | |
2023 | mddev->recovery_cp = MaxSector; | |
1da177e4 LT |
2024 | |
2025 | /* | |
2026 | * find the first working one and use it as a starting point | |
2027 | * to read balancing. | |
2028 | */ | |
2029 | for (j = 0; j < conf->raid_disks && | |
2030 | (!conf->mirrors[j].rdev || | |
b2d444d7 | 2031 | !test_bit(In_sync, &conf->mirrors[j].rdev->flags)) ; j++) |
1da177e4 LT |
2032 | /* nothing */; |
2033 | conf->last_used = j; | |
2034 | ||
2035 | ||
191ea9b2 N |
2036 | mddev->thread = md_register_thread(raid1d, mddev, "%s_raid1"); |
2037 | if (!mddev->thread) { | |
2038 | printk(KERN_ERR | |
2039 | "raid1: couldn't allocate thread for %s\n", | |
2040 | mdname(mddev)); | |
2041 | goto out_free_conf; | |
1da177e4 | 2042 | } |
191ea9b2 | 2043 | |
1da177e4 LT |
2044 | printk(KERN_INFO |
2045 | "raid1: raid set %s active with %d out of %d mirrors\n", | |
2046 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
2047 | mddev->raid_disks); | |
2048 | /* | |
2049 | * Ok, everything is just fine now | |
2050 | */ | |
f233ea5c | 2051 | mddev->array_sectors = mddev->size * 2; |
1da177e4 | 2052 | |
7a5febe9 | 2053 | mddev->queue->unplug_fn = raid1_unplug; |
0d129228 N |
2054 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; |
2055 | mddev->queue->backing_dev_info.congested_data = mddev; | |
7a5febe9 | 2056 | |
1da177e4 LT |
2057 | return 0; |
2058 | ||
2059 | out_no_mem: | |
2060 | printk(KERN_ERR "raid1: couldn't allocate memory for %s\n", | |
2061 | mdname(mddev)); | |
2062 | ||
2063 | out_free_conf: | |
2064 | if (conf) { | |
2065 | if (conf->r1bio_pool) | |
2066 | mempool_destroy(conf->r1bio_pool); | |
990a8baf | 2067 | kfree(conf->mirrors); |
1345b1d8 | 2068 | safe_put_page(conf->tmppage); |
990a8baf | 2069 | kfree(conf->poolinfo); |
1da177e4 LT |
2070 | kfree(conf); |
2071 | mddev->private = NULL; | |
2072 | } | |
2073 | out: | |
2074 | return -EIO; | |
2075 | } | |
2076 | ||
2077 | static int stop(mddev_t *mddev) | |
2078 | { | |
2079 | conf_t *conf = mddev_to_conf(mddev); | |
4b6d287f N |
2080 | struct bitmap *bitmap = mddev->bitmap; |
2081 | int behind_wait = 0; | |
2082 | ||
2083 | /* wait for behind writes to complete */ | |
2084 | while (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
2085 | behind_wait++; | |
2086 | printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait); | |
2087 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2088 | schedule_timeout(HZ); /* wait a second */ | |
2089 | /* need to kick something here to make sure I/O goes? */ | |
2090 | } | |
1da177e4 LT |
2091 | |
2092 | md_unregister_thread(mddev->thread); | |
2093 | mddev->thread = NULL; | |
2094 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
2095 | if (conf->r1bio_pool) | |
2096 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2097 | kfree(conf->mirrors); |
2098 | kfree(conf->poolinfo); | |
1da177e4 LT |
2099 | kfree(conf); |
2100 | mddev->private = NULL; | |
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2105 | { | |
2106 | /* no resync is happening, and there is enough space | |
2107 | * on all devices, so we can resize. | |
2108 | * We need to make sure resync covers any new space. | |
2109 | * If the array is shrinking we should possibly wait until | |
2110 | * any io in the removed space completes, but it hardly seems | |
2111 | * worth it. | |
2112 | */ | |
f233ea5c AN |
2113 | mddev->array_sectors = sectors; |
2114 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
44ce6294 | 2115 | mddev->changed = 1; |
f233ea5c AN |
2116 | if (mddev->array_sectors / 2 > mddev->size && |
2117 | mddev->recovery_cp == MaxSector) { | |
1da177e4 LT |
2118 | mddev->recovery_cp = mddev->size << 1; |
2119 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2120 | } | |
f233ea5c | 2121 | mddev->size = mddev->array_sectors / 2; |
4b5c7ae8 | 2122 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2123 | return 0; |
2124 | } | |
2125 | ||
63c70c4f | 2126 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2127 | { |
2128 | /* We need to: | |
2129 | * 1/ resize the r1bio_pool | |
2130 | * 2/ resize conf->mirrors | |
2131 | * | |
2132 | * We allocate a new r1bio_pool if we can. | |
2133 | * Then raise a device barrier and wait until all IO stops. | |
2134 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2135 | * |
2136 | * At the same time, we "pack" the devices so that all the missing | |
2137 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2138 | */ |
2139 | mempool_t *newpool, *oldpool; | |
2140 | struct pool_info *newpoolinfo; | |
2141 | mirror_info_t *newmirrors; | |
2142 | conf_t *conf = mddev_to_conf(mddev); | |
63c70c4f | 2143 | int cnt, raid_disks; |
c04be0aa | 2144 | unsigned long flags; |
b5470dc5 | 2145 | int d, d2, err; |
1da177e4 | 2146 | |
63c70c4f N |
2147 | /* Cannot change chunk_size, layout, or level */ |
2148 | if (mddev->chunk_size != mddev->new_chunk || | |
2149 | mddev->layout != mddev->new_layout || | |
2150 | mddev->level != mddev->new_level) { | |
2151 | mddev->new_chunk = mddev->chunk_size; | |
2152 | mddev->new_layout = mddev->layout; | |
2153 | mddev->new_level = mddev->level; | |
2154 | return -EINVAL; | |
2155 | } | |
2156 | ||
b5470dc5 DW |
2157 | err = md_allow_write(mddev); |
2158 | if (err) | |
2159 | return err; | |
2a2275d6 | 2160 | |
63c70c4f N |
2161 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2162 | ||
6ea9c07c N |
2163 | if (raid_disks < conf->raid_disks) { |
2164 | cnt=0; | |
2165 | for (d= 0; d < conf->raid_disks; d++) | |
2166 | if (conf->mirrors[d].rdev) | |
2167 | cnt++; | |
2168 | if (cnt > raid_disks) | |
1da177e4 | 2169 | return -EBUSY; |
6ea9c07c | 2170 | } |
1da177e4 LT |
2171 | |
2172 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2173 | if (!newpoolinfo) | |
2174 | return -ENOMEM; | |
2175 | newpoolinfo->mddev = mddev; | |
2176 | newpoolinfo->raid_disks = raid_disks; | |
2177 | ||
2178 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2179 | r1bio_pool_free, newpoolinfo); | |
2180 | if (!newpool) { | |
2181 | kfree(newpoolinfo); | |
2182 | return -ENOMEM; | |
2183 | } | |
9ffae0cf | 2184 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2185 | if (!newmirrors) { |
2186 | kfree(newpoolinfo); | |
2187 | mempool_destroy(newpool); | |
2188 | return -ENOMEM; | |
2189 | } | |
1da177e4 | 2190 | |
17999be4 | 2191 | raise_barrier(conf); |
1da177e4 LT |
2192 | |
2193 | /* ok, everything is stopped */ | |
2194 | oldpool = conf->r1bio_pool; | |
2195 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2196 | |
a88aa786 N |
2197 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2198 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2199 | if (rdev && rdev->raid_disk != d2) { | |
2200 | char nm[20]; | |
2201 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2202 | sysfs_remove_link(&mddev->kobj, nm); | |
2203 | rdev->raid_disk = d2; | |
2204 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2205 | sysfs_remove_link(&mddev->kobj, nm); | |
2206 | if (sysfs_create_link(&mddev->kobj, | |
2207 | &rdev->kobj, nm)) | |
2208 | printk(KERN_WARNING | |
2209 | "md/raid1: cannot register " | |
2210 | "%s for %s\n", | |
2211 | nm, mdname(mddev)); | |
6ea9c07c | 2212 | } |
a88aa786 N |
2213 | if (rdev) |
2214 | newmirrors[d2++].rdev = rdev; | |
2215 | } | |
1da177e4 LT |
2216 | kfree(conf->mirrors); |
2217 | conf->mirrors = newmirrors; | |
2218 | kfree(conf->poolinfo); | |
2219 | conf->poolinfo = newpoolinfo; | |
2220 | ||
c04be0aa | 2221 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2222 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2223 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2224 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2225 | mddev->delta_disks = 0; |
1da177e4 | 2226 | |
6ea9c07c | 2227 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2228 | lower_barrier(conf); |
1da177e4 LT |
2229 | |
2230 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2231 | md_wakeup_thread(mddev->thread); | |
2232 | ||
2233 | mempool_destroy(oldpool); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
500af87a | 2237 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 N |
2238 | { |
2239 | conf_t *conf = mddev_to_conf(mddev); | |
2240 | ||
2241 | switch(state) { | |
9e6603da | 2242 | case 1: |
17999be4 | 2243 | raise_barrier(conf); |
36fa3063 | 2244 | break; |
9e6603da | 2245 | case 0: |
17999be4 | 2246 | lower_barrier(conf); |
36fa3063 N |
2247 | break; |
2248 | } | |
36fa3063 N |
2249 | } |
2250 | ||
1da177e4 | 2251 | |
2604b703 | 2252 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2253 | { |
2254 | .name = "raid1", | |
2604b703 | 2255 | .level = 1, |
1da177e4 LT |
2256 | .owner = THIS_MODULE, |
2257 | .make_request = make_request, | |
2258 | .run = run, | |
2259 | .stop = stop, | |
2260 | .status = status, | |
2261 | .error_handler = error, | |
2262 | .hot_add_disk = raid1_add_disk, | |
2263 | .hot_remove_disk= raid1_remove_disk, | |
2264 | .spare_active = raid1_spare_active, | |
2265 | .sync_request = sync_request, | |
2266 | .resize = raid1_resize, | |
63c70c4f | 2267 | .check_reshape = raid1_reshape, |
36fa3063 | 2268 | .quiesce = raid1_quiesce, |
1da177e4 LT |
2269 | }; |
2270 | ||
2271 | static int __init raid_init(void) | |
2272 | { | |
2604b703 | 2273 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2274 | } |
2275 | ||
2276 | static void raid_exit(void) | |
2277 | { | |
2604b703 | 2278 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2279 | } |
2280 | ||
2281 | module_init(raid_init); | |
2282 | module_exit(raid_exit); | |
2283 | MODULE_LICENSE("GPL"); | |
2284 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ | |
d9d166c2 | 2285 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2286 | MODULE_ALIAS("md-level-1"); |