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" |
1da177e4 | 35 | #include <linux/raid/raid1.h> |
191ea9b2 N |
36 | #include <linux/raid/bitmap.h> |
37 | ||
38 | #define DEBUG 0 | |
39 | #if DEBUG | |
40 | #define PRINTK(x...) printk(x) | |
41 | #else | |
42 | #define PRINTK(x...) | |
43 | #endif | |
1da177e4 LT |
44 | |
45 | /* | |
46 | * Number of guaranteed r1bios in case of extreme VM load: | |
47 | */ | |
48 | #define NR_RAID1_BIOS 256 | |
49 | ||
1da177e4 LT |
50 | |
51 | static void unplug_slaves(mddev_t *mddev); | |
52 | ||
17999be4 N |
53 | static void allow_barrier(conf_t *conf); |
54 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 55 | |
dd0fc66f | 56 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
57 | { |
58 | struct pool_info *pi = data; | |
59 | r1bio_t *r1_bio; | |
60 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); | |
61 | ||
62 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
9ffae0cf N |
63 | r1_bio = kzalloc(size, gfp_flags); |
64 | if (!r1_bio) | |
1da177e4 LT |
65 | unplug_slaves(pi->mddev); |
66 | ||
67 | return r1_bio; | |
68 | } | |
69 | ||
70 | static void r1bio_pool_free(void *r1_bio, void *data) | |
71 | { | |
72 | kfree(r1_bio); | |
73 | } | |
74 | ||
75 | #define RESYNC_BLOCK_SIZE (64*1024) | |
76 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
77 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
78 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
79 | #define RESYNC_WINDOW (2048*1024) | |
80 | ||
dd0fc66f | 81 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
82 | { |
83 | struct pool_info *pi = data; | |
84 | struct page *page; | |
85 | r1bio_t *r1_bio; | |
86 | struct bio *bio; | |
87 | int i, j; | |
88 | ||
89 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
90 | if (!r1_bio) { | |
91 | unplug_slaves(pi->mddev); | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | /* | |
96 | * Allocate bios : 1 for reading, n-1 for writing | |
97 | */ | |
98 | for (j = pi->raid_disks ; j-- ; ) { | |
99 | bio = bio_alloc(gfp_flags, RESYNC_PAGES); | |
100 | if (!bio) | |
101 | goto out_free_bio; | |
102 | r1_bio->bios[j] = bio; | |
103 | } | |
104 | /* | |
105 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
106 | * the first bio. |
107 | * If this is a user-requested check/repair, allocate | |
108 | * RESYNC_PAGES for each bio. | |
1da177e4 | 109 | */ |
d11c171e N |
110 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
111 | j = pi->raid_disks; | |
112 | else | |
113 | j = 1; | |
114 | while(j--) { | |
115 | bio = r1_bio->bios[j]; | |
116 | for (i = 0; i < RESYNC_PAGES; i++) { | |
117 | page = alloc_page(gfp_flags); | |
118 | if (unlikely(!page)) | |
119 | goto out_free_pages; | |
120 | ||
121 | bio->bi_io_vec[i].bv_page = page; | |
122 | } | |
123 | } | |
124 | /* If not user-requests, copy the page pointers to all bios */ | |
125 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
126 | for (i=0; i<RESYNC_PAGES ; i++) | |
127 | for (j=1; j<pi->raid_disks; j++) | |
128 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
129 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
130 | } |
131 | ||
132 | r1_bio->master_bio = NULL; | |
133 | ||
134 | return r1_bio; | |
135 | ||
136 | out_free_pages: | |
d11c171e N |
137 | for (i=0; i < RESYNC_PAGES ; i++) |
138 | for (j=0 ; j < pi->raid_disks; j++) | |
1345b1d8 | 139 | safe_put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 140 | j = -1; |
1da177e4 LT |
141 | out_free_bio: |
142 | while ( ++j < pi->raid_disks ) | |
143 | bio_put(r1_bio->bios[j]); | |
144 | r1bio_pool_free(r1_bio, data); | |
145 | return NULL; | |
146 | } | |
147 | ||
148 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
149 | { | |
150 | struct pool_info *pi = data; | |
d11c171e | 151 | int i,j; |
1da177e4 | 152 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 153 | |
d11c171e N |
154 | for (i = 0; i < RESYNC_PAGES; i++) |
155 | for (j = pi->raid_disks; j-- ;) { | |
156 | if (j == 0 || | |
157 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
158 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 159 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 160 | } |
1da177e4 LT |
161 | for (i=0 ; i < pi->raid_disks; i++) |
162 | bio_put(r1bio->bios[i]); | |
163 | ||
164 | r1bio_pool_free(r1bio, data); | |
165 | } | |
166 | ||
167 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
168 | { | |
169 | int i; | |
170 | ||
171 | for (i = 0; i < conf->raid_disks; i++) { | |
172 | struct bio **bio = r1_bio->bios + i; | |
cf30a473 | 173 | if (*bio && *bio != IO_BLOCKED) |
1da177e4 LT |
174 | bio_put(*bio); |
175 | *bio = NULL; | |
176 | } | |
177 | } | |
178 | ||
858119e1 | 179 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 180 | { |
1da177e4 LT |
181 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
182 | ||
183 | /* | |
184 | * Wake up any possible resync thread that waits for the device | |
185 | * to go idle. | |
186 | */ | |
17999be4 | 187 | allow_barrier(conf); |
1da177e4 LT |
188 | |
189 | put_all_bios(conf, r1_bio); | |
190 | mempool_free(r1_bio, conf->r1bio_pool); | |
191 | } | |
192 | ||
858119e1 | 193 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 LT |
194 | { |
195 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
3e198f78 N |
196 | int i; |
197 | ||
198 | for (i=0; i<conf->raid_disks; i++) { | |
199 | struct bio *bio = r1_bio->bios[i]; | |
200 | if (bio->bi_end_io) | |
201 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
202 | } | |
1da177e4 LT |
203 | |
204 | mempool_free(r1_bio, conf->r1buf_pool); | |
205 | ||
17999be4 | 206 | lower_barrier(conf); |
1da177e4 LT |
207 | } |
208 | ||
209 | static void reschedule_retry(r1bio_t *r1_bio) | |
210 | { | |
211 | unsigned long flags; | |
212 | mddev_t *mddev = r1_bio->mddev; | |
213 | conf_t *conf = mddev_to_conf(mddev); | |
214 | ||
215 | spin_lock_irqsave(&conf->device_lock, flags); | |
216 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 217 | conf->nr_queued ++; |
1da177e4 LT |
218 | spin_unlock_irqrestore(&conf->device_lock, flags); |
219 | ||
17999be4 | 220 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
221 | md_wakeup_thread(mddev->thread); |
222 | } | |
223 | ||
224 | /* | |
225 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
226 | * operation and are ready to return a success/failure code to the buffer | |
227 | * cache layer. | |
228 | */ | |
229 | static void raid_end_bio_io(r1bio_t *r1_bio) | |
230 | { | |
231 | struct bio *bio = r1_bio->master_bio; | |
232 | ||
4b6d287f N |
233 | /* if nobody has done the final endio yet, do it now */ |
234 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
235 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
236 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
237 | (unsigned long long) bio->bi_sector, | |
238 | (unsigned long long) bio->bi_sector + | |
239 | (bio->bi_size >> 9) - 1); | |
240 | ||
6712ecf8 | 241 | bio_endio(bio, |
4b6d287f N |
242 | test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); |
243 | } | |
1da177e4 LT |
244 | free_r1bio(r1_bio); |
245 | } | |
246 | ||
247 | /* | |
248 | * Update disk head position estimator based on IRQ completion info. | |
249 | */ | |
250 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
251 | { | |
252 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
253 | ||
254 | conf->mirrors[disk].head_position = | |
255 | r1_bio->sector + (r1_bio->sectors); | |
256 | } | |
257 | ||
6712ecf8 | 258 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
259 | { |
260 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
261 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
262 | int mirror; | |
263 | conf_t *conf = mddev_to_conf(r1_bio->mddev); | |
264 | ||
1da177e4 LT |
265 | mirror = r1_bio->read_disk; |
266 | /* | |
267 | * this branch is our 'one mirror IO has finished' event handler: | |
268 | */ | |
ddaf22ab N |
269 | update_head_pos(mirror, r1_bio); |
270 | ||
dd00a99e N |
271 | if (uptodate) |
272 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
273 | else { | |
274 | /* If all other devices have failed, we want to return | |
275 | * the error upwards rather than fail the last device. | |
276 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 277 | */ |
dd00a99e N |
278 | unsigned long flags; |
279 | spin_lock_irqsave(&conf->device_lock, flags); | |
280 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
281 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
282 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
283 | uptodate = 1; | |
284 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
285 | } | |
1da177e4 | 286 | |
dd00a99e | 287 | if (uptodate) |
1da177e4 | 288 | raid_end_bio_io(r1_bio); |
dd00a99e | 289 | else { |
1da177e4 LT |
290 | /* |
291 | * oops, read error: | |
292 | */ | |
293 | char b[BDEVNAME_SIZE]; | |
294 | if (printk_ratelimit()) | |
295 | printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n", | |
296 | bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); | |
297 | reschedule_retry(r1_bio); | |
298 | } | |
299 | ||
300 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
301 | } |
302 | ||
6712ecf8 | 303 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
304 | { |
305 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
306 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
a9701a30 | 307 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
1da177e4 | 308 | conf_t *conf = mddev_to_conf(r1_bio->mddev); |
04b857f7 | 309 | struct bio *to_put = NULL; |
1da177e4 | 310 | |
1da177e4 LT |
311 | |
312 | for (mirror = 0; mirror < conf->raid_disks; mirror++) | |
313 | if (r1_bio->bios[mirror] == bio) | |
314 | break; | |
315 | ||
bea27718 | 316 | if (error == -EOPNOTSUPP && test_bit(R1BIO_Barrier, &r1_bio->state)) { |
a9701a30 N |
317 | set_bit(BarriersNotsupp, &conf->mirrors[mirror].rdev->flags); |
318 | set_bit(R1BIO_BarrierRetry, &r1_bio->state); | |
319 | r1_bio->mddev->barriers_work = 0; | |
5e7dd2ab | 320 | /* Don't rdev_dec_pending in this branch - keep it for the retry */ |
a9701a30 | 321 | } else { |
1da177e4 | 322 | /* |
a9701a30 | 323 | * this branch is our 'one mirror IO has finished' event handler: |
1da177e4 | 324 | */ |
a9701a30 | 325 | r1_bio->bios[mirror] = NULL; |
04b857f7 | 326 | to_put = bio; |
a9701a30 N |
327 | if (!uptodate) { |
328 | md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); | |
329 | /* an I/O failed, we can't clear the bitmap */ | |
330 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
331 | } else | |
332 | /* | |
333 | * Set R1BIO_Uptodate in our master bio, so that | |
334 | * we will return a good error code for to the higher | |
335 | * levels even if IO on some other mirrored buffer fails. | |
336 | * | |
337 | * The 'master' represents the composite IO operation to | |
338 | * user-side. So if something waits for IO, then it will | |
339 | * wait for the 'master' bio. | |
340 | */ | |
341 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
342 | ||
343 | update_head_pos(mirror, r1_bio); | |
344 | ||
345 | if (behind) { | |
346 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
347 | atomic_dec(&r1_bio->behind_remaining); | |
348 | ||
349 | /* In behind mode, we ACK the master bio once the I/O has safely | |
350 | * reached all non-writemostly disks. Setting the Returned bit | |
351 | * ensures that this gets done only once -- we don't ever want to | |
352 | * return -EIO here, instead we'll wait */ | |
353 | ||
354 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
355 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
356 | /* Maybe we can return now */ | |
357 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
358 | struct bio *mbio = r1_bio->master_bio; | |
359 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
360 | (unsigned long long) mbio->bi_sector, | |
361 | (unsigned long long) mbio->bi_sector + | |
362 | (mbio->bi_size >> 9) - 1); | |
6712ecf8 | 363 | bio_endio(mbio, 0); |
a9701a30 | 364 | } |
4b6d287f N |
365 | } |
366 | } | |
5e7dd2ab | 367 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
4b6d287f | 368 | } |
1da177e4 LT |
369 | /* |
370 | * | |
371 | * Let's see if all mirrored write operations have finished | |
372 | * already. | |
373 | */ | |
374 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
c70810b3 | 375 | if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) |
a9701a30 | 376 | reschedule_retry(r1_bio); |
c70810b3 N |
377 | else { |
378 | /* it really is the end of this request */ | |
379 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
380 | /* free extra copy of the data pages */ | |
381 | int i = bio->bi_vcnt; | |
382 | while (i--) | |
383 | safe_put_page(bio->bi_io_vec[i].bv_page); | |
384 | } | |
385 | /* clear the bitmap if all writes complete successfully */ | |
386 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
387 | r1_bio->sectors, | |
388 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
389 | behind); | |
390 | md_write_end(r1_bio->mddev); | |
391 | raid_end_bio_io(r1_bio); | |
4b6d287f | 392 | } |
1da177e4 | 393 | } |
c70810b3 | 394 | |
04b857f7 N |
395 | if (to_put) |
396 | bio_put(to_put); | |
1da177e4 LT |
397 | } |
398 | ||
399 | ||
400 | /* | |
401 | * This routine returns the disk from which the requested read should | |
402 | * be done. There is a per-array 'next expected sequential IO' sector | |
403 | * number - if this matches on the next IO then we use the last disk. | |
404 | * There is also a per-disk 'last know head position' sector that is | |
405 | * maintained from IRQ contexts, both the normal and the resync IO | |
406 | * completion handlers update this position correctly. If there is no | |
407 | * perfect sequential match then we pick the disk whose head is closest. | |
408 | * | |
409 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
410 | * because position is mirror, not device based. | |
411 | * | |
412 | * The rdev for the device selected will have nr_pending incremented. | |
413 | */ | |
414 | static int read_balance(conf_t *conf, r1bio_t *r1_bio) | |
415 | { | |
416 | const unsigned long this_sector = r1_bio->sector; | |
417 | int new_disk = conf->last_used, disk = new_disk; | |
8ddf9efe | 418 | int wonly_disk = -1; |
1da177e4 LT |
419 | const int sectors = r1_bio->sectors; |
420 | sector_t new_distance, current_distance; | |
8ddf9efe | 421 | mdk_rdev_t *rdev; |
1da177e4 LT |
422 | |
423 | rcu_read_lock(); | |
424 | /* | |
8ddf9efe | 425 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
426 | * device if no resync is going on, or below the resync window. |
427 | * We take the first readable disk when above the resync window. | |
428 | */ | |
429 | retry: | |
430 | if (conf->mddev->recovery_cp < MaxSector && | |
431 | (this_sector + sectors >= conf->next_resync)) { | |
432 | /* Choose the first operation device, for consistancy */ | |
433 | new_disk = 0; | |
434 | ||
d6065f7b | 435 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
cf30a473 | 436 | r1_bio->bios[new_disk] == IO_BLOCKED || |
b2d444d7 | 437 | !rdev || !test_bit(In_sync, &rdev->flags) |
8ddf9efe | 438 | || test_bit(WriteMostly, &rdev->flags); |
d6065f7b | 439 | rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) { |
8ddf9efe | 440 | |
cf30a473 N |
441 | if (rdev && test_bit(In_sync, &rdev->flags) && |
442 | r1_bio->bios[new_disk] != IO_BLOCKED) | |
8ddf9efe N |
443 | wonly_disk = new_disk; |
444 | ||
445 | if (new_disk == conf->raid_disks - 1) { | |
446 | new_disk = wonly_disk; | |
1da177e4 LT |
447 | break; |
448 | } | |
449 | } | |
450 | goto rb_out; | |
451 | } | |
452 | ||
453 | ||
454 | /* make sure the disk is operational */ | |
d6065f7b | 455 | for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
cf30a473 | 456 | r1_bio->bios[new_disk] == IO_BLOCKED || |
b2d444d7 | 457 | !rdev || !test_bit(In_sync, &rdev->flags) || |
8ddf9efe | 458 | test_bit(WriteMostly, &rdev->flags); |
d6065f7b | 459 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) { |
8ddf9efe | 460 | |
cf30a473 N |
461 | if (rdev && test_bit(In_sync, &rdev->flags) && |
462 | r1_bio->bios[new_disk] != IO_BLOCKED) | |
8ddf9efe N |
463 | wonly_disk = new_disk; |
464 | ||
1da177e4 LT |
465 | if (new_disk <= 0) |
466 | new_disk = conf->raid_disks; | |
467 | new_disk--; | |
468 | if (new_disk == disk) { | |
8ddf9efe N |
469 | new_disk = wonly_disk; |
470 | break; | |
1da177e4 LT |
471 | } |
472 | } | |
8ddf9efe N |
473 | |
474 | if (new_disk < 0) | |
475 | goto rb_out; | |
476 | ||
1da177e4 LT |
477 | disk = new_disk; |
478 | /* now disk == new_disk == starting point for search */ | |
479 | ||
480 | /* | |
481 | * Don't change to another disk for sequential reads: | |
482 | */ | |
483 | if (conf->next_seq_sect == this_sector) | |
484 | goto rb_out; | |
485 | if (this_sector == conf->mirrors[new_disk].head_position) | |
486 | goto rb_out; | |
487 | ||
488 | current_distance = abs(this_sector - conf->mirrors[disk].head_position); | |
489 | ||
490 | /* Find the disk whose head is closest */ | |
491 | ||
492 | do { | |
493 | if (disk <= 0) | |
494 | disk = conf->raid_disks; | |
495 | disk--; | |
496 | ||
d6065f7b | 497 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
8ddf9efe | 498 | |
cf30a473 | 499 | if (!rdev || r1_bio->bios[disk] == IO_BLOCKED || |
b2d444d7 | 500 | !test_bit(In_sync, &rdev->flags) || |
8ddf9efe | 501 | test_bit(WriteMostly, &rdev->flags)) |
1da177e4 LT |
502 | continue; |
503 | ||
504 | if (!atomic_read(&rdev->nr_pending)) { | |
505 | new_disk = disk; | |
1da177e4 LT |
506 | break; |
507 | } | |
508 | new_distance = abs(this_sector - conf->mirrors[disk].head_position); | |
509 | if (new_distance < current_distance) { | |
510 | current_distance = new_distance; | |
511 | new_disk = disk; | |
1da177e4 LT |
512 | } |
513 | } while (disk != conf->last_used); | |
514 | ||
8ddf9efe | 515 | rb_out: |
1da177e4 LT |
516 | |
517 | ||
518 | if (new_disk >= 0) { | |
d6065f7b | 519 | rdev = rcu_dereference(conf->mirrors[new_disk].rdev); |
8ddf9efe N |
520 | if (!rdev) |
521 | goto retry; | |
522 | atomic_inc(&rdev->nr_pending); | |
b2d444d7 | 523 | if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
524 | /* cannot risk returning a device that failed |
525 | * before we inc'ed nr_pending | |
526 | */ | |
03c902e1 | 527 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
528 | goto retry; |
529 | } | |
8ddf9efe N |
530 | conf->next_seq_sect = this_sector + sectors; |
531 | conf->last_used = new_disk; | |
1da177e4 LT |
532 | } |
533 | rcu_read_unlock(); | |
534 | ||
535 | return new_disk; | |
536 | } | |
537 | ||
538 | static void unplug_slaves(mddev_t *mddev) | |
539 | { | |
540 | conf_t *conf = mddev_to_conf(mddev); | |
541 | int i; | |
542 | ||
543 | rcu_read_lock(); | |
544 | for (i=0; i<mddev->raid_disks; i++) { | |
d6065f7b | 545 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
b2d444d7 | 546 | if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { |
165125e1 | 547 | struct request_queue *r_queue = bdev_get_queue(rdev->bdev); |
1da177e4 LT |
548 | |
549 | atomic_inc(&rdev->nr_pending); | |
550 | rcu_read_unlock(); | |
551 | ||
2ad8b1ef | 552 | blk_unplug(r_queue); |
1da177e4 LT |
553 | |
554 | rdev_dec_pending(rdev, mddev); | |
555 | rcu_read_lock(); | |
556 | } | |
557 | } | |
558 | rcu_read_unlock(); | |
559 | } | |
560 | ||
165125e1 | 561 | static void raid1_unplug(struct request_queue *q) |
1da177e4 | 562 | { |
191ea9b2 N |
563 | mddev_t *mddev = q->queuedata; |
564 | ||
565 | unplug_slaves(mddev); | |
566 | md_wakeup_thread(mddev->thread); | |
1da177e4 LT |
567 | } |
568 | ||
0d129228 N |
569 | static int raid1_congested(void *data, int bits) |
570 | { | |
571 | mddev_t *mddev = data; | |
572 | conf_t *conf = mddev_to_conf(mddev); | |
573 | int i, ret = 0; | |
574 | ||
575 | rcu_read_lock(); | |
576 | for (i = 0; i < mddev->raid_disks; i++) { | |
577 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
578 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
165125e1 | 579 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 N |
580 | |
581 | /* Note the '|| 1' - when read_balance prefers | |
582 | * non-congested targets, it can be removed | |
583 | */ | |
584 | if ((bits & (1<<BDI_write_congested)) || 1) | |
585 | ret |= bdi_congested(&q->backing_dev_info, bits); | |
586 | else | |
587 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
588 | } | |
589 | } | |
590 | rcu_read_unlock(); | |
591 | return ret; | |
592 | } | |
593 | ||
594 | ||
a35e63ef N |
595 | static int flush_pending_writes(conf_t *conf) |
596 | { | |
597 | /* Any writes that have been queued but are awaiting | |
598 | * bitmap updates get flushed here. | |
599 | * We return 1 if any requests were actually submitted. | |
600 | */ | |
601 | int rv = 0; | |
602 | ||
603 | spin_lock_irq(&conf->device_lock); | |
604 | ||
605 | if (conf->pending_bio_list.head) { | |
606 | struct bio *bio; | |
607 | bio = bio_list_get(&conf->pending_bio_list); | |
608 | blk_remove_plug(conf->mddev->queue); | |
609 | spin_unlock_irq(&conf->device_lock); | |
610 | /* flush any pending bitmap writes to | |
611 | * disk before proceeding w/ I/O */ | |
612 | bitmap_unplug(conf->mddev->bitmap); | |
613 | ||
614 | while (bio) { /* submit pending writes */ | |
615 | struct bio *next = bio->bi_next; | |
616 | bio->bi_next = NULL; | |
617 | generic_make_request(bio); | |
618 | bio = next; | |
619 | } | |
620 | rv = 1; | |
621 | } else | |
622 | spin_unlock_irq(&conf->device_lock); | |
623 | return rv; | |
624 | } | |
625 | ||
17999be4 N |
626 | /* Barriers.... |
627 | * Sometimes we need to suspend IO while we do something else, | |
628 | * either some resync/recovery, or reconfigure the array. | |
629 | * To do this we raise a 'barrier'. | |
630 | * The 'barrier' is a counter that can be raised multiple times | |
631 | * to count how many activities are happening which preclude | |
632 | * normal IO. | |
633 | * We can only raise the barrier if there is no pending IO. | |
634 | * i.e. if nr_pending == 0. | |
635 | * We choose only to raise the barrier if no-one is waiting for the | |
636 | * barrier to go down. This means that as soon as an IO request | |
637 | * is ready, no other operations which require a barrier will start | |
638 | * until the IO request has had a chance. | |
639 | * | |
640 | * So: regular IO calls 'wait_barrier'. When that returns there | |
641 | * is no backgroup IO happening, It must arrange to call | |
642 | * allow_barrier when it has finished its IO. | |
643 | * backgroup IO calls must call raise_barrier. Once that returns | |
644 | * there is no normal IO happeing. It must arrange to call | |
645 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
646 | */ |
647 | #define RESYNC_DEPTH 32 | |
648 | ||
17999be4 | 649 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
650 | { |
651 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
652 | |
653 | /* Wait until no block IO is waiting */ | |
654 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
655 | conf->resync_lock, | |
656 | raid1_unplug(conf->mddev->queue)); | |
657 | ||
658 | /* block any new IO from starting */ | |
659 | conf->barrier++; | |
660 | ||
661 | /* No wait for all pending IO to complete */ | |
662 | wait_event_lock_irq(conf->wait_barrier, | |
663 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
664 | conf->resync_lock, | |
665 | raid1_unplug(conf->mddev->queue)); | |
666 | ||
667 | spin_unlock_irq(&conf->resync_lock); | |
668 | } | |
669 | ||
670 | static void lower_barrier(conf_t *conf) | |
671 | { | |
672 | unsigned long flags; | |
673 | spin_lock_irqsave(&conf->resync_lock, flags); | |
674 | conf->barrier--; | |
675 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
676 | wake_up(&conf->wait_barrier); | |
677 | } | |
678 | ||
679 | static void wait_barrier(conf_t *conf) | |
680 | { | |
681 | spin_lock_irq(&conf->resync_lock); | |
682 | if (conf->barrier) { | |
683 | conf->nr_waiting++; | |
684 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
685 | conf->resync_lock, | |
686 | raid1_unplug(conf->mddev->queue)); | |
687 | conf->nr_waiting--; | |
1da177e4 | 688 | } |
17999be4 | 689 | conf->nr_pending++; |
1da177e4 LT |
690 | spin_unlock_irq(&conf->resync_lock); |
691 | } | |
692 | ||
17999be4 N |
693 | static void allow_barrier(conf_t *conf) |
694 | { | |
695 | unsigned long flags; | |
696 | spin_lock_irqsave(&conf->resync_lock, flags); | |
697 | conf->nr_pending--; | |
698 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
699 | wake_up(&conf->wait_barrier); | |
700 | } | |
701 | ||
ddaf22ab N |
702 | static void freeze_array(conf_t *conf) |
703 | { | |
704 | /* stop syncio and normal IO and wait for everything to | |
705 | * go quite. | |
706 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
707 | * wait until nr_pending match nr_queued+1 |
708 | * This is called in the context of one normal IO request | |
709 | * that has failed. Thus any sync request that might be pending | |
710 | * will be blocked by nr_pending, and we need to wait for | |
711 | * pending IO requests to complete or be queued for re-try. | |
712 | * Thus the number queued (nr_queued) plus this request (1) | |
713 | * must match the number of pending IOs (nr_pending) before | |
714 | * we continue. | |
ddaf22ab N |
715 | */ |
716 | spin_lock_irq(&conf->resync_lock); | |
717 | conf->barrier++; | |
718 | conf->nr_waiting++; | |
719 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 720 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 721 | conf->resync_lock, |
a35e63ef N |
722 | ({ flush_pending_writes(conf); |
723 | raid1_unplug(conf->mddev->queue); })); | |
ddaf22ab N |
724 | spin_unlock_irq(&conf->resync_lock); |
725 | } | |
726 | static void unfreeze_array(conf_t *conf) | |
727 | { | |
728 | /* reverse the effect of the freeze */ | |
729 | spin_lock_irq(&conf->resync_lock); | |
730 | conf->barrier--; | |
731 | conf->nr_waiting--; | |
732 | wake_up(&conf->wait_barrier); | |
733 | spin_unlock_irq(&conf->resync_lock); | |
734 | } | |
735 | ||
17999be4 | 736 | |
4b6d287f N |
737 | /* duplicate the data pages for behind I/O */ |
738 | static struct page **alloc_behind_pages(struct bio *bio) | |
739 | { | |
740 | int i; | |
741 | struct bio_vec *bvec; | |
9ffae0cf | 742 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *), |
4b6d287f N |
743 | GFP_NOIO); |
744 | if (unlikely(!pages)) | |
745 | goto do_sync_io; | |
746 | ||
4b6d287f N |
747 | bio_for_each_segment(bvec, bio, i) { |
748 | pages[i] = alloc_page(GFP_NOIO); | |
749 | if (unlikely(!pages[i])) | |
750 | goto do_sync_io; | |
751 | memcpy(kmap(pages[i]) + bvec->bv_offset, | |
752 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
753 | kunmap(pages[i]); | |
754 | kunmap(bvec->bv_page); | |
755 | } | |
756 | ||
757 | return pages; | |
758 | ||
759 | do_sync_io: | |
760 | if (pages) | |
761 | for (i = 0; i < bio->bi_vcnt && pages[i]; i++) | |
2d1f3b5d | 762 | put_page(pages[i]); |
4b6d287f N |
763 | kfree(pages); |
764 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); | |
765 | return NULL; | |
766 | } | |
767 | ||
165125e1 | 768 | static int make_request(struct request_queue *q, struct bio * bio) |
1da177e4 LT |
769 | { |
770 | mddev_t *mddev = q->queuedata; | |
771 | conf_t *conf = mddev_to_conf(mddev); | |
772 | mirror_info_t *mirror; | |
773 | r1bio_t *r1_bio; | |
774 | struct bio *read_bio; | |
191ea9b2 | 775 | int i, targets = 0, disks; |
1da177e4 | 776 | mdk_rdev_t *rdev; |
191ea9b2 N |
777 | struct bitmap *bitmap = mddev->bitmap; |
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); |
a9701a30 | 783 | int do_barriers; |
191ea9b2 | 784 | |
1da177e4 LT |
785 | /* |
786 | * Register the new request and wait if the reconstruction | |
787 | * thread has put up a bar for new requests. | |
788 | * Continue immediately if no resync is active currently. | |
62de608d N |
789 | * We test barriers_work *after* md_write_start as md_write_start |
790 | * may cause the first superblock write, and that will check out | |
791 | * if barriers work. | |
1da177e4 | 792 | */ |
62de608d | 793 | |
3d310eb7 N |
794 | md_write_start(mddev, bio); /* wait on superblock update early */ |
795 | ||
62de608d N |
796 | if (unlikely(!mddev->barriers_work && bio_barrier(bio))) { |
797 | if (rw == WRITE) | |
798 | md_write_end(mddev); | |
6712ecf8 | 799 | bio_endio(bio, -EOPNOTSUPP); |
62de608d N |
800 | return 0; |
801 | } | |
802 | ||
17999be4 | 803 | wait_barrier(conf); |
1da177e4 | 804 | |
a362357b JA |
805 | disk_stat_inc(mddev->gendisk, ios[rw]); |
806 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); | |
1da177e4 LT |
807 | |
808 | /* | |
809 | * make_request() can abort the operation when READA is being | |
810 | * used and no empty request is available. | |
811 | * | |
812 | */ | |
813 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
814 | ||
815 | r1_bio->master_bio = bio; | |
816 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 817 | r1_bio->state = 0; |
1da177e4 LT |
818 | r1_bio->mddev = mddev; |
819 | r1_bio->sector = bio->bi_sector; | |
820 | ||
a362357b | 821 | if (rw == READ) { |
1da177e4 LT |
822 | /* |
823 | * read balancing logic: | |
824 | */ | |
825 | int rdisk = read_balance(conf, r1_bio); | |
826 | ||
827 | if (rdisk < 0) { | |
828 | /* couldn't find anywhere to read from */ | |
829 | raid_end_bio_io(r1_bio); | |
830 | return 0; | |
831 | } | |
832 | mirror = conf->mirrors + rdisk; | |
833 | ||
834 | r1_bio->read_disk = rdisk; | |
835 | ||
836 | read_bio = bio_clone(bio, GFP_NOIO); | |
837 | ||
838 | r1_bio->bios[rdisk] = read_bio; | |
839 | ||
840 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
841 | read_bio->bi_bdev = mirror->rdev->bdev; | |
842 | read_bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 843 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
844 | read_bio->bi_private = r1_bio; |
845 | ||
846 | generic_make_request(read_bio); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | /* | |
851 | * WRITE: | |
852 | */ | |
853 | /* first select target devices under spinlock and | |
854 | * inc refcount on their rdev. Record them by setting | |
855 | * bios[x] to bio | |
856 | */ | |
857 | disks = conf->raid_disks; | |
191ea9b2 N |
858 | #if 0 |
859 | { static int first=1; | |
860 | if (first) printk("First Write sector %llu disks %d\n", | |
861 | (unsigned long long)r1_bio->sector, disks); | |
862 | first = 0; | |
863 | } | |
864 | #endif | |
1da177e4 LT |
865 | rcu_read_lock(); |
866 | for (i = 0; i < disks; i++) { | |
d6065f7b | 867 | if ((rdev=rcu_dereference(conf->mirrors[i].rdev)) != NULL && |
b2d444d7 | 868 | !test_bit(Faulty, &rdev->flags)) { |
1da177e4 | 869 | atomic_inc(&rdev->nr_pending); |
b2d444d7 | 870 | if (test_bit(Faulty, &rdev->flags)) { |
03c902e1 | 871 | rdev_dec_pending(rdev, mddev); |
1da177e4 LT |
872 | r1_bio->bios[i] = NULL; |
873 | } else | |
874 | r1_bio->bios[i] = bio; | |
191ea9b2 | 875 | targets++; |
1da177e4 LT |
876 | } else |
877 | r1_bio->bios[i] = NULL; | |
878 | } | |
879 | rcu_read_unlock(); | |
880 | ||
4b6d287f N |
881 | BUG_ON(targets == 0); /* we never fail the last device */ |
882 | ||
191ea9b2 N |
883 | if (targets < conf->raid_disks) { |
884 | /* array is degraded, we will not clear the bitmap | |
885 | * on I/O completion (see raid1_end_write_request) */ | |
886 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
887 | } | |
888 | ||
4b6d287f N |
889 | /* do behind I/O ? */ |
890 | if (bitmap && | |
891 | atomic_read(&bitmap->behind_writes) < bitmap->max_write_behind && | |
892 | (behind_pages = alloc_behind_pages(bio)) != NULL) | |
893 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
894 | ||
191ea9b2 | 895 | atomic_set(&r1_bio->remaining, 0); |
4b6d287f | 896 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 897 | |
04b857f7 | 898 | do_barriers = bio_barrier(bio); |
a9701a30 N |
899 | if (do_barriers) |
900 | set_bit(R1BIO_Barrier, &r1_bio->state); | |
901 | ||
191ea9b2 | 902 | bio_list_init(&bl); |
1da177e4 LT |
903 | for (i = 0; i < disks; i++) { |
904 | struct bio *mbio; | |
905 | if (!r1_bio->bios[i]) | |
906 | continue; | |
907 | ||
908 | mbio = bio_clone(bio, GFP_NOIO); | |
909 | r1_bio->bios[i] = mbio; | |
910 | ||
911 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; | |
912 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
913 | mbio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 914 | mbio->bi_rw = WRITE | do_barriers | do_sync; |
1da177e4 LT |
915 | mbio->bi_private = r1_bio; |
916 | ||
4b6d287f N |
917 | if (behind_pages) { |
918 | struct bio_vec *bvec; | |
919 | int j; | |
920 | ||
921 | /* Yes, I really want the '__' version so that | |
922 | * we clear any unused pointer in the io_vec, rather | |
923 | * than leave them unchanged. This is important | |
924 | * because when we come to free the pages, we won't | |
925 | * know the originial bi_idx, so we just free | |
926 | * them all | |
927 | */ | |
928 | __bio_for_each_segment(bvec, mbio, j, 0) | |
929 | bvec->bv_page = behind_pages[j]; | |
930 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) | |
931 | atomic_inc(&r1_bio->behind_remaining); | |
932 | } | |
933 | ||
1da177e4 | 934 | atomic_inc(&r1_bio->remaining); |
1da177e4 | 935 | |
191ea9b2 | 936 | bio_list_add(&bl, mbio); |
1da177e4 | 937 | } |
4b6d287f | 938 | kfree(behind_pages); /* the behind pages are attached to the bios now */ |
1da177e4 | 939 | |
4b6d287f N |
940 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
941 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
191ea9b2 N |
942 | spin_lock_irqsave(&conf->device_lock, flags); |
943 | bio_list_merge(&conf->pending_bio_list, &bl); | |
944 | bio_list_init(&bl); | |
945 | ||
946 | blk_plug_device(mddev->queue); | |
947 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
948 | ||
a35e63ef N |
949 | /* In case raid1d snuck into freeze_array */ |
950 | wake_up(&conf->wait_barrier); | |
951 | ||
e3881a68 LE |
952 | if (do_sync) |
953 | md_wakeup_thread(mddev->thread); | |
191ea9b2 N |
954 | #if 0 |
955 | while ((bio = bio_list_pop(&bl)) != NULL) | |
956 | generic_make_request(bio); | |
957 | #endif | |
958 | ||
1da177e4 LT |
959 | return 0; |
960 | } | |
961 | ||
962 | static void status(struct seq_file *seq, mddev_t *mddev) | |
963 | { | |
964 | conf_t *conf = mddev_to_conf(mddev); | |
965 | int i; | |
966 | ||
967 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 968 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
969 | rcu_read_lock(); |
970 | for (i = 0; i < conf->raid_disks; i++) { | |
971 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 972 | seq_printf(seq, "%s", |
ddac7c7e N |
973 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
974 | } | |
975 | rcu_read_unlock(); | |
1da177e4 LT |
976 | seq_printf(seq, "]"); |
977 | } | |
978 | ||
979 | ||
980 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
981 | { | |
982 | char b[BDEVNAME_SIZE]; | |
983 | conf_t *conf = mddev_to_conf(mddev); | |
984 | ||
985 | /* | |
986 | * If it is not operational, then we have already marked it as dead | |
987 | * else if it is the last working disks, ignore the error, let the | |
988 | * next level up know. | |
989 | * else mark the drive as failed | |
990 | */ | |
b2d444d7 | 991 | if (test_bit(In_sync, &rdev->flags) |
11ce99e6 | 992 | && (conf->raid_disks - mddev->degraded) == 1) |
1da177e4 LT |
993 | /* |
994 | * Don't fail the drive, act as though we were just a | |
995 | * normal single drive | |
996 | */ | |
997 | return; | |
c04be0aa N |
998 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
999 | unsigned long flags; | |
1000 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1001 | mddev->degraded++; |
dd00a99e | 1002 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1003 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1004 | /* |
1005 | * if recovery is running, make sure it aborts. | |
1006 | */ | |
1007 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
dd00a99e N |
1008 | } else |
1009 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1010 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 LT |
1011 | printk(KERN_ALERT "raid1: Disk failure on %s, disabling device. \n" |
1012 | " Operation continuing on %d devices\n", | |
11ce99e6 | 1013 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | static void print_conf(conf_t *conf) | |
1017 | { | |
1018 | int i; | |
1da177e4 LT |
1019 | |
1020 | printk("RAID1 conf printout:\n"); | |
1021 | if (!conf) { | |
1022 | printk("(!conf)\n"); | |
1023 | return; | |
1024 | } | |
11ce99e6 | 1025 | printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1026 | conf->raid_disks); |
1027 | ||
ddac7c7e | 1028 | rcu_read_lock(); |
1da177e4 LT |
1029 | for (i = 0; i < conf->raid_disks; i++) { |
1030 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
1031 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1032 | if (rdev) | |
1da177e4 | 1033 | printk(" disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1034 | i, !test_bit(In_sync, &rdev->flags), |
1035 | !test_bit(Faulty, &rdev->flags), | |
1036 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1037 | } |
ddac7c7e | 1038 | rcu_read_unlock(); |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | static void close_sync(conf_t *conf) | |
1042 | { | |
17999be4 N |
1043 | wait_barrier(conf); |
1044 | allow_barrier(conf); | |
1da177e4 LT |
1045 | |
1046 | mempool_destroy(conf->r1buf_pool); | |
1047 | conf->r1buf_pool = NULL; | |
1048 | } | |
1049 | ||
1050 | static int raid1_spare_active(mddev_t *mddev) | |
1051 | { | |
1052 | int i; | |
1053 | conf_t *conf = mddev->private; | |
1da177e4 LT |
1054 | |
1055 | /* | |
1056 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1057 | * and mark them readable. |
1058 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1059 | */ |
1060 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1061 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1062 | if (rdev | |
1063 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa N |
1064 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
1065 | unsigned long flags; | |
1066 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1067 | mddev->degraded--; |
c04be0aa | 1068 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1069 | } |
1070 | } | |
1071 | ||
1072 | print_conf(conf); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | ||
1077 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1078 | { | |
1079 | conf_t *conf = mddev->private; | |
1080 | int found = 0; | |
41158c7e | 1081 | int mirror = 0; |
1da177e4 LT |
1082 | mirror_info_t *p; |
1083 | ||
1084 | for (mirror=0; mirror < mddev->raid_disks; mirror++) | |
1085 | if ( !(p=conf->mirrors+mirror)->rdev) { | |
1086 | ||
1087 | blk_queue_stack_limits(mddev->queue, | |
1088 | rdev->bdev->bd_disk->queue); | |
1089 | /* as we don't honour merge_bvec_fn, we must never risk | |
1090 | * violating it, so limit ->max_sector to one PAGE, as | |
1091 | * a one page request is never in violation. | |
1092 | */ | |
1093 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1094 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1095 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1096 | ||
1097 | p->head_position = 0; | |
1098 | rdev->raid_disk = mirror; | |
1099 | found = 1; | |
6aea114a N |
1100 | /* As all devices are equivalent, we don't need a full recovery |
1101 | * if this was recently any drive of the array | |
1102 | */ | |
1103 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1104 | conf->fullsync = 1; |
d6065f7b | 1105 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1106 | break; |
1107 | } | |
1108 | ||
1109 | print_conf(conf); | |
1110 | return found; | |
1111 | } | |
1112 | ||
1113 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1114 | { | |
1115 | conf_t *conf = mddev->private; | |
1116 | int err = 0; | |
1117 | mdk_rdev_t *rdev; | |
1118 | mirror_info_t *p = conf->mirrors+ number; | |
1119 | ||
1120 | print_conf(conf); | |
1121 | rdev = p->rdev; | |
1122 | if (rdev) { | |
b2d444d7 | 1123 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1124 | atomic_read(&rdev->nr_pending)) { |
1125 | err = -EBUSY; | |
1126 | goto abort; | |
1127 | } | |
1128 | p->rdev = NULL; | |
fbd568a3 | 1129 | synchronize_rcu(); |
1da177e4 LT |
1130 | if (atomic_read(&rdev->nr_pending)) { |
1131 | /* lost the race, try later */ | |
1132 | err = -EBUSY; | |
1133 | p->rdev = rdev; | |
1134 | } | |
1135 | } | |
1136 | abort: | |
1137 | ||
1138 | print_conf(conf); | |
1139 | return err; | |
1140 | } | |
1141 | ||
1142 | ||
6712ecf8 | 1143 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1144 | { |
1da177e4 | 1145 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
d11c171e | 1146 | int i; |
1da177e4 | 1147 | |
d11c171e N |
1148 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1149 | if (r1_bio->bios[i] == bio) | |
1150 | break; | |
1151 | BUG_ON(i < 0); | |
1152 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1153 | /* |
1154 | * we have read a block, now it needs to be re-written, | |
1155 | * or re-read if the read failed. | |
1156 | * We don't do much here, just schedule handling by raid1d | |
1157 | */ | |
69382e85 | 1158 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1159 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1160 | |
1161 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1162 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1163 | } |
1164 | ||
6712ecf8 | 1165 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1166 | { |
1167 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1168 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
1169 | mddev_t *mddev = r1_bio->mddev; | |
1170 | conf_t *conf = mddev_to_conf(mddev); | |
1171 | int i; | |
1172 | int mirror=0; | |
1173 | ||
1da177e4 LT |
1174 | for (i = 0; i < conf->raid_disks; i++) |
1175 | if (r1_bio->bios[i] == bio) { | |
1176 | mirror = i; | |
1177 | break; | |
1178 | } | |
6b1117d5 N |
1179 | if (!uptodate) { |
1180 | int sync_blocks = 0; | |
1181 | sector_t s = r1_bio->sector; | |
1182 | long sectors_to_go = r1_bio->sectors; | |
1183 | /* make sure these bits doesn't get cleared. */ | |
1184 | do { | |
5e3db645 | 1185 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1186 | &sync_blocks, 1); |
1187 | s += sync_blocks; | |
1188 | sectors_to_go -= sync_blocks; | |
1189 | } while (sectors_to_go > 0); | |
1da177e4 | 1190 | md_error(mddev, conf->mirrors[mirror].rdev); |
6b1117d5 | 1191 | } |
e3b9703e | 1192 | |
1da177e4 LT |
1193 | update_head_pos(mirror, r1_bio); |
1194 | ||
1195 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
1196 | md_done_sync(mddev, r1_bio->sectors, uptodate); | |
1197 | put_buf(r1_bio); | |
1198 | } | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1202 | { | |
1203 | conf_t *conf = mddev_to_conf(mddev); | |
1204 | int i; | |
1205 | int disks = conf->raid_disks; | |
1206 | struct bio *bio, *wbio; | |
1207 | ||
1208 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1209 | ||
69382e85 | 1210 | |
d11c171e N |
1211 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
1212 | /* We have read all readable devices. If we haven't | |
1213 | * got the block, then there is no hope left. | |
1214 | * If we have, then we want to do a comparison | |
1215 | * and skip the write if everything is the same. | |
1216 | * If any blocks failed to read, then we need to | |
1217 | * attempt an over-write | |
1218 | */ | |
1219 | int primary; | |
1220 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
1221 | for (i=0; i<mddev->raid_disks; i++) | |
1222 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) | |
1223 | md_error(mddev, conf->mirrors[i].rdev); | |
1224 | ||
1225 | md_done_sync(mddev, r1_bio->sectors, 1); | |
1226 | put_buf(r1_bio); | |
1227 | return; | |
1228 | } | |
1229 | for (primary=0; primary<mddev->raid_disks; primary++) | |
1230 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && | |
1231 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1232 | r1_bio->bios[primary]->bi_end_io = NULL; | |
03c902e1 | 1233 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); |
d11c171e N |
1234 | break; |
1235 | } | |
1236 | r1_bio->read_disk = primary; | |
1237 | for (i=0; i<mddev->raid_disks; i++) | |
ed456662 | 1238 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) { |
d11c171e N |
1239 | int j; |
1240 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1241 | struct bio *pbio = r1_bio->bios[primary]; | |
1242 | struct bio *sbio = r1_bio->bios[i]; | |
ed456662 MA |
1243 | |
1244 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1245 | for (j = vcnt; j-- ; ) { | |
1246 | struct page *p, *s; | |
1247 | p = pbio->bi_io_vec[j].bv_page; | |
1248 | s = sbio->bi_io_vec[j].bv_page; | |
1249 | if (memcmp(page_address(p), | |
1250 | page_address(s), | |
1251 | PAGE_SIZE)) | |
1252 | break; | |
1253 | } | |
1254 | } else | |
1255 | j = 0; | |
d11c171e N |
1256 | if (j >= 0) |
1257 | mddev->resync_mismatches += r1_bio->sectors; | |
cf7a4416 N |
1258 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1259 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
d11c171e | 1260 | sbio->bi_end_io = NULL; |
03c902e1 N |
1261 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); |
1262 | } else { | |
d11c171e N |
1263 | /* fixup the bio for reuse */ |
1264 | sbio->bi_vcnt = vcnt; | |
1265 | sbio->bi_size = r1_bio->sectors << 9; | |
1266 | sbio->bi_idx = 0; | |
1267 | sbio->bi_phys_segments = 0; | |
1268 | sbio->bi_hw_segments = 0; | |
1269 | sbio->bi_hw_front_size = 0; | |
1270 | sbio->bi_hw_back_size = 0; | |
1271 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1272 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1273 | sbio->bi_next = NULL; | |
1274 | sbio->bi_sector = r1_bio->sector + | |
1275 | conf->mirrors[i].rdev->data_offset; | |
1276 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
3eda22d1 N |
1277 | for (j = 0; j < vcnt ; j++) |
1278 | memcpy(page_address(sbio->bi_io_vec[j].bv_page), | |
1279 | page_address(pbio->bi_io_vec[j].bv_page), | |
1280 | PAGE_SIZE); | |
1281 | ||
d11c171e N |
1282 | } |
1283 | } | |
1284 | } | |
1da177e4 | 1285 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
69382e85 N |
1286 | /* ouch - failed to read all of that. |
1287 | * Try some synchronous reads of other devices to get | |
1288 | * good data, much like with normal read errors. Only | |
ddac7c7e | 1289 | * read into the pages we already have so we don't |
69382e85 N |
1290 | * need to re-issue the read request. |
1291 | * We don't need to freeze the array, because being in an | |
1292 | * active sync request, there is no normal IO, and | |
1293 | * no overlapping syncs. | |
1da177e4 | 1294 | */ |
69382e85 N |
1295 | sector_t sect = r1_bio->sector; |
1296 | int sectors = r1_bio->sectors; | |
1297 | int idx = 0; | |
1298 | ||
1299 | while(sectors) { | |
1300 | int s = sectors; | |
1301 | int d = r1_bio->read_disk; | |
1302 | int success = 0; | |
1303 | mdk_rdev_t *rdev; | |
1304 | ||
1305 | if (s > (PAGE_SIZE>>9)) | |
1306 | s = PAGE_SIZE >> 9; | |
1307 | do { | |
1308 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
ddac7c7e N |
1309 | /* No rcu protection needed here devices |
1310 | * can only be removed when no resync is | |
1311 | * active, and resync is currently active | |
1312 | */ | |
69382e85 N |
1313 | rdev = conf->mirrors[d].rdev; |
1314 | if (sync_page_io(rdev->bdev, | |
1315 | sect + rdev->data_offset, | |
1316 | s<<9, | |
1317 | bio->bi_io_vec[idx].bv_page, | |
1318 | READ)) { | |
1319 | success = 1; | |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | d++; | |
1324 | if (d == conf->raid_disks) | |
1325 | d = 0; | |
1326 | } while (!success && d != r1_bio->read_disk); | |
1327 | ||
1328 | if (success) { | |
097426f6 | 1329 | int start = d; |
69382e85 N |
1330 | /* write it back and re-read */ |
1331 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
1332 | while (d != r1_bio->read_disk) { | |
1333 | if (d == 0) | |
1334 | d = conf->raid_disks; | |
1335 | d--; | |
1336 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1337 | continue; | |
1338 | rdev = conf->mirrors[d].rdev; | |
4dbcdc75 | 1339 | atomic_add(s, &rdev->corrected_errors); |
69382e85 N |
1340 | if (sync_page_io(rdev->bdev, |
1341 | sect + rdev->data_offset, | |
1342 | s<<9, | |
1343 | bio->bi_io_vec[idx].bv_page, | |
097426f6 N |
1344 | WRITE) == 0) |
1345 | md_error(mddev, rdev); | |
1346 | } | |
1347 | d = start; | |
1348 | while (d != r1_bio->read_disk) { | |
1349 | if (d == 0) | |
1350 | d = conf->raid_disks; | |
1351 | d--; | |
1352 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1353 | continue; | |
1354 | rdev = conf->mirrors[d].rdev; | |
1355 | if (sync_page_io(rdev->bdev, | |
69382e85 N |
1356 | sect + rdev->data_offset, |
1357 | s<<9, | |
1358 | bio->bi_io_vec[idx].bv_page, | |
097426f6 | 1359 | READ) == 0) |
69382e85 | 1360 | md_error(mddev, rdev); |
69382e85 N |
1361 | } |
1362 | } else { | |
1363 | char b[BDEVNAME_SIZE]; | |
1364 | /* Cannot read from anywhere, array is toast */ | |
1365 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1366 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" | |
1367 | " for block %llu\n", | |
1368 | bdevname(bio->bi_bdev,b), | |
1369 | (unsigned long long)r1_bio->sector); | |
1370 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1371 | put_buf(r1_bio); | |
1372 | return; | |
1373 | } | |
1374 | sectors -= s; | |
1375 | sect += s; | |
1376 | idx ++; | |
1377 | } | |
1da177e4 | 1378 | } |
d11c171e N |
1379 | |
1380 | /* | |
1381 | * schedule writes | |
1382 | */ | |
1da177e4 LT |
1383 | atomic_set(&r1_bio->remaining, 1); |
1384 | for (i = 0; i < disks ; i++) { | |
1385 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1386 | if (wbio->bi_end_io == NULL || |
1387 | (wbio->bi_end_io == end_sync_read && | |
1388 | (i == r1_bio->read_disk || | |
1389 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1390 | continue; |
1391 | ||
3e198f78 N |
1392 | wbio->bi_rw = WRITE; |
1393 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1394 | atomic_inc(&r1_bio->remaining); |
1395 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1396 | |
1da177e4 LT |
1397 | generic_make_request(wbio); |
1398 | } | |
1399 | ||
1400 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1401 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1402 | md_done_sync(mddev, r1_bio->sectors, 1); |
1403 | put_buf(r1_bio); | |
1404 | } | |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * This is a kernel thread which: | |
1409 | * | |
1410 | * 1. Retries failed read operations on working mirrors. | |
1411 | * 2. Updates the raid superblock when problems encounter. | |
1412 | * 3. Performs writes following reads for array syncronising. | |
1413 | */ | |
1414 | ||
867868fb N |
1415 | static void fix_read_error(conf_t *conf, int read_disk, |
1416 | sector_t sect, int sectors) | |
1417 | { | |
1418 | mddev_t *mddev = conf->mddev; | |
1419 | while(sectors) { | |
1420 | int s = sectors; | |
1421 | int d = read_disk; | |
1422 | int success = 0; | |
1423 | int start; | |
1424 | mdk_rdev_t *rdev; | |
1425 | ||
1426 | if (s > (PAGE_SIZE>>9)) | |
1427 | s = PAGE_SIZE >> 9; | |
1428 | ||
1429 | do { | |
1430 | /* Note: no rcu protection needed here | |
1431 | * as this is synchronous in the raid1d thread | |
1432 | * which is the thread that might remove | |
1433 | * a device. If raid1d ever becomes multi-threaded.... | |
1434 | */ | |
1435 | rdev = conf->mirrors[d].rdev; | |
1436 | if (rdev && | |
1437 | test_bit(In_sync, &rdev->flags) && | |
1438 | sync_page_io(rdev->bdev, | |
1439 | sect + rdev->data_offset, | |
1440 | s<<9, | |
1441 | conf->tmppage, READ)) | |
1442 | success = 1; | |
1443 | else { | |
1444 | d++; | |
1445 | if (d == conf->raid_disks) | |
1446 | d = 0; | |
1447 | } | |
1448 | } while (!success && d != read_disk); | |
1449 | ||
1450 | if (!success) { | |
1451 | /* Cannot read from anywhere -- bye bye array */ | |
1452 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1453 | break; | |
1454 | } | |
1455 | /* write it back and re-read */ | |
1456 | start = d; | |
1457 | while (d != read_disk) { | |
1458 | if (d==0) | |
1459 | d = conf->raid_disks; | |
1460 | d--; | |
1461 | rdev = conf->mirrors[d].rdev; | |
1462 | if (rdev && | |
1463 | test_bit(In_sync, &rdev->flags)) { | |
1464 | if (sync_page_io(rdev->bdev, | |
1465 | sect + rdev->data_offset, | |
1466 | s<<9, conf->tmppage, WRITE) | |
1467 | == 0) | |
1468 | /* Well, this device is dead */ | |
1469 | md_error(mddev, rdev); | |
1470 | } | |
1471 | } | |
1472 | d = start; | |
1473 | while (d != read_disk) { | |
1474 | char b[BDEVNAME_SIZE]; | |
1475 | if (d==0) | |
1476 | d = conf->raid_disks; | |
1477 | d--; | |
1478 | rdev = conf->mirrors[d].rdev; | |
1479 | if (rdev && | |
1480 | test_bit(In_sync, &rdev->flags)) { | |
1481 | if (sync_page_io(rdev->bdev, | |
1482 | sect + rdev->data_offset, | |
1483 | s<<9, conf->tmppage, READ) | |
1484 | == 0) | |
1485 | /* Well, this device is dead */ | |
1486 | md_error(mddev, rdev); | |
1487 | else { | |
1488 | atomic_add(s, &rdev->corrected_errors); | |
1489 | printk(KERN_INFO | |
1490 | "raid1:%s: read error corrected " | |
1491 | "(%d sectors at %llu on %s)\n", | |
1492 | mdname(mddev), s, | |
969b755a RD |
1493 | (unsigned long long)(sect + |
1494 | rdev->data_offset), | |
867868fb N |
1495 | bdevname(rdev->bdev, b)); |
1496 | } | |
1497 | } | |
1498 | } | |
1499 | sectors -= s; | |
1500 | sect += s; | |
1501 | } | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | static void raid1d(mddev_t *mddev) |
1505 | { | |
1506 | r1bio_t *r1_bio; | |
1507 | struct bio *bio; | |
1508 | unsigned long flags; | |
1509 | conf_t *conf = mddev_to_conf(mddev); | |
1510 | struct list_head *head = &conf->retry_list; | |
1511 | int unplug=0; | |
1512 | mdk_rdev_t *rdev; | |
1513 | ||
1514 | md_check_recovery(mddev); | |
1da177e4 LT |
1515 | |
1516 | for (;;) { | |
1517 | char b[BDEVNAME_SIZE]; | |
191ea9b2 | 1518 | |
a35e63ef | 1519 | unplug += flush_pending_writes(conf); |
191ea9b2 | 1520 | |
a35e63ef N |
1521 | spin_lock_irqsave(&conf->device_lock, flags); |
1522 | if (list_empty(head)) { | |
1523 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 1524 | break; |
a35e63ef | 1525 | } |
1da177e4 LT |
1526 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
1527 | list_del(head->prev); | |
ddaf22ab | 1528 | conf->nr_queued--; |
1da177e4 LT |
1529 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1530 | ||
1531 | mddev = r1_bio->mddev; | |
1532 | conf = mddev_to_conf(mddev); | |
1533 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { | |
1534 | sync_request_write(mddev, r1_bio); | |
1535 | unplug = 1; | |
a9701a30 N |
1536 | } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) { |
1537 | /* some requests in the r1bio were BIO_RW_BARRIER | |
bea27718 | 1538 | * requests which failed with -EOPNOTSUPP. Hohumm.. |
a9701a30 N |
1539 | * Better resubmit without the barrier. |
1540 | * We know which devices to resubmit for, because | |
1541 | * all others have had their bios[] entry cleared. | |
5e7dd2ab | 1542 | * We already have a nr_pending reference on these rdevs. |
a9701a30 N |
1543 | */ |
1544 | int i; | |
e3881a68 | 1545 | const int do_sync = bio_sync(r1_bio->master_bio); |
a9701a30 N |
1546 | clear_bit(R1BIO_BarrierRetry, &r1_bio->state); |
1547 | clear_bit(R1BIO_Barrier, &r1_bio->state); | |
2f889129 N |
1548 | for (i=0; i < conf->raid_disks; i++) |
1549 | if (r1_bio->bios[i]) | |
1550 | atomic_inc(&r1_bio->remaining); | |
a9701a30 N |
1551 | for (i=0; i < conf->raid_disks; i++) |
1552 | if (r1_bio->bios[i]) { | |
1553 | struct bio_vec *bvec; | |
1554 | int j; | |
1555 | ||
1556 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1557 | /* copy pages from the failed bio, as | |
1558 | * this might be a write-behind device */ | |
1559 | __bio_for_each_segment(bvec, bio, j, 0) | |
1560 | bvec->bv_page = bio_iovec_idx(r1_bio->bios[i], j)->bv_page; | |
1561 | bio_put(r1_bio->bios[i]); | |
1562 | bio->bi_sector = r1_bio->sector + | |
1563 | conf->mirrors[i].rdev->data_offset; | |
1564 | bio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1565 | bio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 1566 | bio->bi_rw = WRITE | do_sync; |
a9701a30 N |
1567 | bio->bi_private = r1_bio; |
1568 | r1_bio->bios[i] = bio; | |
1569 | generic_make_request(bio); | |
1570 | } | |
1da177e4 LT |
1571 | } else { |
1572 | int disk; | |
ddaf22ab N |
1573 | |
1574 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1575 | * the block and we can fix it. | |
1576 | * We freeze all other IO, and try reading the block from | |
1577 | * other devices. When we find one, we re-write | |
1578 | * and check it that fixes the read error. | |
1579 | * This is all done synchronously while the array is | |
1580 | * frozen | |
1581 | */ | |
867868fb N |
1582 | if (mddev->ro == 0) { |
1583 | freeze_array(conf); | |
1584 | fix_read_error(conf, r1_bio->read_disk, | |
1585 | r1_bio->sector, | |
1586 | r1_bio->sectors); | |
1587 | unfreeze_array(conf); | |
ddaf22ab N |
1588 | } |
1589 | ||
1da177e4 LT |
1590 | bio = r1_bio->bios[r1_bio->read_disk]; |
1591 | if ((disk=read_balance(conf, r1_bio)) == -1) { | |
1592 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O" | |
1593 | " read error for block %llu\n", | |
1594 | bdevname(bio->bi_bdev,b), | |
1595 | (unsigned long long)r1_bio->sector); | |
1596 | raid_end_bio_io(r1_bio); | |
1597 | } else { | |
e3881a68 | 1598 | const int do_sync = bio_sync(r1_bio->master_bio); |
cf30a473 N |
1599 | r1_bio->bios[r1_bio->read_disk] = |
1600 | mddev->ro ? IO_BLOCKED : NULL; | |
1da177e4 LT |
1601 | r1_bio->read_disk = disk; |
1602 | bio_put(bio); | |
1603 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1604 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1605 | rdev = conf->mirrors[disk].rdev; | |
1606 | if (printk_ratelimit()) | |
1607 | printk(KERN_ERR "raid1: %s: redirecting sector %llu to" | |
1608 | " another mirror\n", | |
1609 | bdevname(rdev->bdev,b), | |
1610 | (unsigned long long)r1_bio->sector); | |
1611 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1612 | bio->bi_bdev = rdev->bdev; | |
1613 | bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 1614 | bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1615 | bio->bi_private = r1_bio; |
1616 | unplug = 1; | |
1617 | generic_make_request(bio); | |
1618 | } | |
1619 | } | |
1620 | } | |
1da177e4 LT |
1621 | if (unplug) |
1622 | unplug_slaves(mddev); | |
1623 | } | |
1624 | ||
1625 | ||
1626 | static int init_resync(conf_t *conf) | |
1627 | { | |
1628 | int buffs; | |
1629 | ||
1630 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 1631 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
1632 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
1633 | conf->poolinfo); | |
1634 | if (!conf->r1buf_pool) | |
1635 | return -ENOMEM; | |
1636 | conf->next_resync = 0; | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * perform a "sync" on one "block" | |
1642 | * | |
1643 | * We need to make sure that no normal I/O request - particularly write | |
1644 | * requests - conflict with active sync requests. | |
1645 | * | |
1646 | * This is achieved by tracking pending requests and a 'barrier' concept | |
1647 | * that can be installed to exclude normal IO requests. | |
1648 | */ | |
1649 | ||
57afd89f | 1650 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 LT |
1651 | { |
1652 | conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
1653 | r1bio_t *r1_bio; |
1654 | struct bio *bio; | |
1655 | sector_t max_sector, nr_sectors; | |
3e198f78 | 1656 | int disk = -1; |
1da177e4 | 1657 | int i; |
3e198f78 N |
1658 | int wonly = -1; |
1659 | int write_targets = 0, read_targets = 0; | |
191ea9b2 | 1660 | int sync_blocks; |
e3b9703e | 1661 | int still_degraded = 0; |
1da177e4 LT |
1662 | |
1663 | if (!conf->r1buf_pool) | |
191ea9b2 N |
1664 | { |
1665 | /* | |
1666 | printk("sync start - bitmap %p\n", mddev->bitmap); | |
1667 | */ | |
1da177e4 | 1668 | if (init_resync(conf)) |
57afd89f | 1669 | return 0; |
191ea9b2 | 1670 | } |
1da177e4 LT |
1671 | |
1672 | max_sector = mddev->size << 1; | |
1673 | if (sector_nr >= max_sector) { | |
191ea9b2 N |
1674 | /* If we aborted, we need to abort the |
1675 | * sync on the 'current' bitmap chunk (there will | |
1676 | * only be one in raid1 resync. | |
1677 | * We can find the current addess in mddev->curr_resync | |
1678 | */ | |
6a806c51 N |
1679 | if (mddev->curr_resync < max_sector) /* aborted */ |
1680 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 1681 | &sync_blocks, 1); |
6a806c51 | 1682 | else /* completed sync */ |
191ea9b2 | 1683 | conf->fullsync = 0; |
6a806c51 N |
1684 | |
1685 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
1686 | close_sync(conf); |
1687 | return 0; | |
1688 | } | |
1689 | ||
07d84d10 N |
1690 | if (mddev->bitmap == NULL && |
1691 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 1692 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
1693 | conf->fullsync == 0) { |
1694 | *skipped = 1; | |
1695 | return max_sector - sector_nr; | |
1696 | } | |
6394cca5 N |
1697 | /* before building a request, check if we can skip these blocks.. |
1698 | * This call the bitmap_start_sync doesn't actually record anything | |
1699 | */ | |
e3b9703e | 1700 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 1701 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
1702 | /* We can skip this block, and probably several more */ |
1703 | *skipped = 1; | |
1704 | return sync_blocks; | |
1705 | } | |
1da177e4 | 1706 | /* |
17999be4 N |
1707 | * If there is non-resync activity waiting for a turn, |
1708 | * and resync is going fast enough, | |
1709 | * then let it though before starting on this new sync request. | |
1da177e4 | 1710 | */ |
17999be4 | 1711 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 1712 | msleep_interruptible(1000); |
17999be4 | 1713 | |
b47490c9 | 1714 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
17999be4 N |
1715 | raise_barrier(conf); |
1716 | ||
1717 | conf->next_resync = sector_nr; | |
1da177e4 | 1718 | |
3e198f78 N |
1719 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
1720 | rcu_read_lock(); | |
1da177e4 | 1721 | /* |
3e198f78 N |
1722 | * If we get a correctably read error during resync or recovery, |
1723 | * we might want to read from a different device. So we | |
1724 | * flag all drives that could conceivably be read from for READ, | |
1725 | * and any others (which will be non-In_sync devices) for WRITE. | |
1726 | * If a read fails, we try reading from something else for which READ | |
1727 | * is OK. | |
1da177e4 | 1728 | */ |
1da177e4 | 1729 | |
1da177e4 LT |
1730 | r1_bio->mddev = mddev; |
1731 | r1_bio->sector = sector_nr; | |
191ea9b2 | 1732 | r1_bio->state = 0; |
1da177e4 | 1733 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
1734 | |
1735 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 1736 | mdk_rdev_t *rdev; |
1da177e4 LT |
1737 | bio = r1_bio->bios[i]; |
1738 | ||
1739 | /* take from bio_init */ | |
1740 | bio->bi_next = NULL; | |
1741 | bio->bi_flags |= 1 << BIO_UPTODATE; | |
802ba064 | 1742 | bio->bi_rw = READ; |
1da177e4 LT |
1743 | bio->bi_vcnt = 0; |
1744 | bio->bi_idx = 0; | |
1745 | bio->bi_phys_segments = 0; | |
1746 | bio->bi_hw_segments = 0; | |
1747 | bio->bi_size = 0; | |
1748 | bio->bi_end_io = NULL; | |
1749 | bio->bi_private = NULL; | |
1750 | ||
3e198f78 N |
1751 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
1752 | if (rdev == NULL || | |
1753 | test_bit(Faulty, &rdev->flags)) { | |
e3b9703e N |
1754 | still_degraded = 1; |
1755 | continue; | |
3e198f78 | 1756 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
1757 | bio->bi_rw = WRITE; |
1758 | bio->bi_end_io = end_sync_write; | |
1759 | write_targets ++; | |
3e198f78 N |
1760 | } else { |
1761 | /* may need to read from here */ | |
1762 | bio->bi_rw = READ; | |
1763 | bio->bi_end_io = end_sync_read; | |
1764 | if (test_bit(WriteMostly, &rdev->flags)) { | |
1765 | if (wonly < 0) | |
1766 | wonly = i; | |
1767 | } else { | |
1768 | if (disk < 0) | |
1769 | disk = i; | |
1770 | } | |
1771 | read_targets++; | |
1772 | } | |
1773 | atomic_inc(&rdev->nr_pending); | |
1774 | bio->bi_sector = sector_nr + rdev->data_offset; | |
1775 | bio->bi_bdev = rdev->bdev; | |
1da177e4 LT |
1776 | bio->bi_private = r1_bio; |
1777 | } | |
3e198f78 N |
1778 | rcu_read_unlock(); |
1779 | if (disk < 0) | |
1780 | disk = wonly; | |
1781 | r1_bio->read_disk = disk; | |
191ea9b2 | 1782 | |
3e198f78 N |
1783 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
1784 | /* extra read targets are also write targets */ | |
1785 | write_targets += read_targets-1; | |
1786 | ||
1787 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
1788 | /* There is nowhere to write, so all non-sync |
1789 | * drives must be failed - so we are finished | |
1790 | */ | |
57afd89f N |
1791 | sector_t rv = max_sector - sector_nr; |
1792 | *skipped = 1; | |
1da177e4 | 1793 | put_buf(r1_bio); |
1da177e4 LT |
1794 | return rv; |
1795 | } | |
1796 | ||
c6207277 N |
1797 | if (max_sector > mddev->resync_max) |
1798 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
1da177e4 | 1799 | nr_sectors = 0; |
289e99e8 | 1800 | sync_blocks = 0; |
1da177e4 LT |
1801 | do { |
1802 | struct page *page; | |
1803 | int len = PAGE_SIZE; | |
1804 | if (sector_nr + (len>>9) > max_sector) | |
1805 | len = (max_sector - sector_nr) << 9; | |
1806 | if (len == 0) | |
1807 | break; | |
6a806c51 N |
1808 | if (sync_blocks == 0) { |
1809 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
1810 | &sync_blocks, still_degraded) && |
1811 | !conf->fullsync && | |
1812 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 1813 | break; |
9e77c485 | 1814 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
6a806c51 N |
1815 | if (len > (sync_blocks<<9)) |
1816 | len = sync_blocks<<9; | |
ab7a30c7 | 1817 | } |
191ea9b2 | 1818 | |
1da177e4 LT |
1819 | for (i=0 ; i < conf->raid_disks; i++) { |
1820 | bio = r1_bio->bios[i]; | |
1821 | if (bio->bi_end_io) { | |
d11c171e | 1822 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
1823 | if (bio_add_page(bio, page, len, 0) == 0) { |
1824 | /* stop here */ | |
d11c171e | 1825 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
1826 | while (i > 0) { |
1827 | i--; | |
1828 | bio = r1_bio->bios[i]; | |
6a806c51 N |
1829 | if (bio->bi_end_io==NULL) |
1830 | continue; | |
1da177e4 LT |
1831 | /* remove last page from this bio */ |
1832 | bio->bi_vcnt--; | |
1833 | bio->bi_size -= len; | |
1834 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1835 | } | |
1836 | goto bio_full; | |
1837 | } | |
1838 | } | |
1839 | } | |
1840 | nr_sectors += len>>9; | |
1841 | sector_nr += len>>9; | |
191ea9b2 | 1842 | sync_blocks -= (len>>9); |
1da177e4 LT |
1843 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1844 | bio_full: | |
1da177e4 LT |
1845 | r1_bio->sectors = nr_sectors; |
1846 | ||
d11c171e N |
1847 | /* For a user-requested sync, we read all readable devices and do a |
1848 | * compare | |
1849 | */ | |
1850 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1851 | atomic_set(&r1_bio->remaining, read_targets); | |
1852 | for (i=0; i<conf->raid_disks; i++) { | |
1853 | bio = r1_bio->bios[i]; | |
1854 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 1855 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
1856 | generic_make_request(bio); |
1857 | } | |
1858 | } | |
1859 | } else { | |
1860 | atomic_set(&r1_bio->remaining, 1); | |
1861 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 1862 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 1863 | generic_make_request(bio); |
1da177e4 | 1864 | |
d11c171e | 1865 | } |
1da177e4 LT |
1866 | return nr_sectors; |
1867 | } | |
1868 | ||
1869 | static int run(mddev_t *mddev) | |
1870 | { | |
1871 | conf_t *conf; | |
1872 | int i, j, disk_idx; | |
1873 | mirror_info_t *disk; | |
1874 | mdk_rdev_t *rdev; | |
1875 | struct list_head *tmp; | |
1876 | ||
1877 | if (mddev->level != 1) { | |
1878 | printk("raid1: %s: raid level not set to mirroring (%d)\n", | |
1879 | mdname(mddev), mddev->level); | |
1880 | goto out; | |
1881 | } | |
f6705578 N |
1882 | if (mddev->reshape_position != MaxSector) { |
1883 | printk("raid1: %s: reshape_position set but not supported\n", | |
1884 | mdname(mddev)); | |
1885 | goto out; | |
1886 | } | |
1da177e4 LT |
1887 | /* |
1888 | * copy the already verified devices into our private RAID1 | |
1889 | * bookkeeping area. [whatever we allocate in run(), | |
1890 | * should be freed in stop()] | |
1891 | */ | |
9ffae0cf | 1892 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 LT |
1893 | mddev->private = conf; |
1894 | if (!conf) | |
1895 | goto out_no_mem; | |
1896 | ||
9ffae0cf | 1897 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
1898 | GFP_KERNEL); |
1899 | if (!conf->mirrors) | |
1900 | goto out_no_mem; | |
1901 | ||
ddaf22ab N |
1902 | conf->tmppage = alloc_page(GFP_KERNEL); |
1903 | if (!conf->tmppage) | |
1904 | goto out_no_mem; | |
1905 | ||
1da177e4 LT |
1906 | conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1907 | if (!conf->poolinfo) | |
1908 | goto out_no_mem; | |
1909 | conf->poolinfo->mddev = mddev; | |
1910 | conf->poolinfo->raid_disks = mddev->raid_disks; | |
1911 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
1912 | r1bio_pool_free, | |
1913 | conf->poolinfo); | |
1914 | if (!conf->r1bio_pool) | |
1915 | goto out_no_mem; | |
1916 | ||
d089c6af | 1917 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1918 | disk_idx = rdev->raid_disk; |
1919 | if (disk_idx >= mddev->raid_disks | |
1920 | || disk_idx < 0) | |
1921 | continue; | |
1922 | disk = conf->mirrors + disk_idx; | |
1923 | ||
1924 | disk->rdev = rdev; | |
1925 | ||
1926 | blk_queue_stack_limits(mddev->queue, | |
1927 | rdev->bdev->bd_disk->queue); | |
1928 | /* as we don't honour merge_bvec_fn, we must never risk | |
1929 | * violating it, so limit ->max_sector to one PAGE, as | |
1930 | * a one page request is never in violation. | |
1931 | */ | |
1932 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1933 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1934 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1935 | ||
1936 | disk->head_position = 0; | |
1da177e4 LT |
1937 | } |
1938 | conf->raid_disks = mddev->raid_disks; | |
1939 | conf->mddev = mddev; | |
1940 | spin_lock_init(&conf->device_lock); | |
1941 | INIT_LIST_HEAD(&conf->retry_list); | |
1da177e4 LT |
1942 | |
1943 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 1944 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 1945 | |
191ea9b2 N |
1946 | bio_list_init(&conf->pending_bio_list); |
1947 | bio_list_init(&conf->flushing_bio_list); | |
1948 | ||
1da177e4 LT |
1949 | |
1950 | mddev->degraded = 0; | |
1951 | for (i = 0; i < conf->raid_disks; i++) { | |
1952 | ||
1953 | disk = conf->mirrors + i; | |
1954 | ||
5fd6c1dc N |
1955 | if (!disk->rdev || |
1956 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 LT |
1957 | disk->head_position = 0; |
1958 | mddev->degraded++; | |
918f0238 N |
1959 | if (disk->rdev) |
1960 | conf->fullsync = 1; | |
1da177e4 LT |
1961 | } |
1962 | } | |
11ce99e6 N |
1963 | if (mddev->degraded == conf->raid_disks) { |
1964 | printk(KERN_ERR "raid1: no operational mirrors for %s\n", | |
1965 | mdname(mddev)); | |
1966 | goto out_free_conf; | |
1967 | } | |
1968 | if (conf->raid_disks - mddev->degraded == 1) | |
1969 | mddev->recovery_cp = MaxSector; | |
1da177e4 LT |
1970 | |
1971 | /* | |
1972 | * find the first working one and use it as a starting point | |
1973 | * to read balancing. | |
1974 | */ | |
1975 | for (j = 0; j < conf->raid_disks && | |
1976 | (!conf->mirrors[j].rdev || | |
b2d444d7 | 1977 | !test_bit(In_sync, &conf->mirrors[j].rdev->flags)) ; j++) |
1da177e4 LT |
1978 | /* nothing */; |
1979 | conf->last_used = j; | |
1980 | ||
1981 | ||
191ea9b2 N |
1982 | mddev->thread = md_register_thread(raid1d, mddev, "%s_raid1"); |
1983 | if (!mddev->thread) { | |
1984 | printk(KERN_ERR | |
1985 | "raid1: couldn't allocate thread for %s\n", | |
1986 | mdname(mddev)); | |
1987 | goto out_free_conf; | |
1da177e4 | 1988 | } |
191ea9b2 | 1989 | |
1da177e4 LT |
1990 | printk(KERN_INFO |
1991 | "raid1: raid set %s active with %d out of %d mirrors\n", | |
1992 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
1993 | mddev->raid_disks); | |
1994 | /* | |
1995 | * Ok, everything is just fine now | |
1996 | */ | |
1997 | mddev->array_size = mddev->size; | |
1998 | ||
7a5febe9 | 1999 | mddev->queue->unplug_fn = raid1_unplug; |
0d129228 N |
2000 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; |
2001 | mddev->queue->backing_dev_info.congested_data = mddev; | |
7a5febe9 | 2002 | |
1da177e4 LT |
2003 | return 0; |
2004 | ||
2005 | out_no_mem: | |
2006 | printk(KERN_ERR "raid1: couldn't allocate memory for %s\n", | |
2007 | mdname(mddev)); | |
2008 | ||
2009 | out_free_conf: | |
2010 | if (conf) { | |
2011 | if (conf->r1bio_pool) | |
2012 | mempool_destroy(conf->r1bio_pool); | |
990a8baf | 2013 | kfree(conf->mirrors); |
1345b1d8 | 2014 | safe_put_page(conf->tmppage); |
990a8baf | 2015 | kfree(conf->poolinfo); |
1da177e4 LT |
2016 | kfree(conf); |
2017 | mddev->private = NULL; | |
2018 | } | |
2019 | out: | |
2020 | return -EIO; | |
2021 | } | |
2022 | ||
2023 | static int stop(mddev_t *mddev) | |
2024 | { | |
2025 | conf_t *conf = mddev_to_conf(mddev); | |
4b6d287f N |
2026 | struct bitmap *bitmap = mddev->bitmap; |
2027 | int behind_wait = 0; | |
2028 | ||
2029 | /* wait for behind writes to complete */ | |
2030 | while (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
2031 | behind_wait++; | |
2032 | printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait); | |
2033 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2034 | schedule_timeout(HZ); /* wait a second */ | |
2035 | /* need to kick something here to make sure I/O goes? */ | |
2036 | } | |
1da177e4 LT |
2037 | |
2038 | md_unregister_thread(mddev->thread); | |
2039 | mddev->thread = NULL; | |
2040 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
2041 | if (conf->r1bio_pool) | |
2042 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2043 | kfree(conf->mirrors); |
2044 | kfree(conf->poolinfo); | |
1da177e4 LT |
2045 | kfree(conf); |
2046 | mddev->private = NULL; | |
2047 | return 0; | |
2048 | } | |
2049 | ||
2050 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2051 | { | |
2052 | /* no resync is happening, and there is enough space | |
2053 | * on all devices, so we can resize. | |
2054 | * We need to make sure resync covers any new space. | |
2055 | * If the array is shrinking we should possibly wait until | |
2056 | * any io in the removed space completes, but it hardly seems | |
2057 | * worth it. | |
2058 | */ | |
2059 | mddev->array_size = sectors>>1; | |
2060 | set_capacity(mddev->gendisk, mddev->array_size << 1); | |
44ce6294 | 2061 | mddev->changed = 1; |
1da177e4 LT |
2062 | if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) { |
2063 | mddev->recovery_cp = mddev->size << 1; | |
2064 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2065 | } | |
2066 | mddev->size = mddev->array_size; | |
4b5c7ae8 | 2067 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2068 | return 0; |
2069 | } | |
2070 | ||
63c70c4f | 2071 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2072 | { |
2073 | /* We need to: | |
2074 | * 1/ resize the r1bio_pool | |
2075 | * 2/ resize conf->mirrors | |
2076 | * | |
2077 | * We allocate a new r1bio_pool if we can. | |
2078 | * Then raise a device barrier and wait until all IO stops. | |
2079 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2080 | * |
2081 | * At the same time, we "pack" the devices so that all the missing | |
2082 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2083 | */ |
2084 | mempool_t *newpool, *oldpool; | |
2085 | struct pool_info *newpoolinfo; | |
2086 | mirror_info_t *newmirrors; | |
2087 | conf_t *conf = mddev_to_conf(mddev); | |
63c70c4f | 2088 | int cnt, raid_disks; |
c04be0aa | 2089 | unsigned long flags; |
6ea9c07c | 2090 | int d, d2; |
1da177e4 | 2091 | |
63c70c4f N |
2092 | /* Cannot change chunk_size, layout, or level */ |
2093 | if (mddev->chunk_size != mddev->new_chunk || | |
2094 | mddev->layout != mddev->new_layout || | |
2095 | mddev->level != mddev->new_level) { | |
2096 | mddev->new_chunk = mddev->chunk_size; | |
2097 | mddev->new_layout = mddev->layout; | |
2098 | mddev->new_level = mddev->level; | |
2099 | return -EINVAL; | |
2100 | } | |
2101 | ||
2a2275d6 N |
2102 | md_allow_write(mddev); |
2103 | ||
63c70c4f N |
2104 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2105 | ||
6ea9c07c N |
2106 | if (raid_disks < conf->raid_disks) { |
2107 | cnt=0; | |
2108 | for (d= 0; d < conf->raid_disks; d++) | |
2109 | if (conf->mirrors[d].rdev) | |
2110 | cnt++; | |
2111 | if (cnt > raid_disks) | |
1da177e4 | 2112 | return -EBUSY; |
6ea9c07c | 2113 | } |
1da177e4 LT |
2114 | |
2115 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2116 | if (!newpoolinfo) | |
2117 | return -ENOMEM; | |
2118 | newpoolinfo->mddev = mddev; | |
2119 | newpoolinfo->raid_disks = raid_disks; | |
2120 | ||
2121 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2122 | r1bio_pool_free, newpoolinfo); | |
2123 | if (!newpool) { | |
2124 | kfree(newpoolinfo); | |
2125 | return -ENOMEM; | |
2126 | } | |
9ffae0cf | 2127 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2128 | if (!newmirrors) { |
2129 | kfree(newpoolinfo); | |
2130 | mempool_destroy(newpool); | |
2131 | return -ENOMEM; | |
2132 | } | |
1da177e4 | 2133 | |
17999be4 | 2134 | raise_barrier(conf); |
1da177e4 LT |
2135 | |
2136 | /* ok, everything is stopped */ | |
2137 | oldpool = conf->r1bio_pool; | |
2138 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2139 | |
a88aa786 N |
2140 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2141 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2142 | if (rdev && rdev->raid_disk != d2) { | |
2143 | char nm[20]; | |
2144 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2145 | sysfs_remove_link(&mddev->kobj, nm); | |
2146 | rdev->raid_disk = d2; | |
2147 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2148 | sysfs_remove_link(&mddev->kobj, nm); | |
2149 | if (sysfs_create_link(&mddev->kobj, | |
2150 | &rdev->kobj, nm)) | |
2151 | printk(KERN_WARNING | |
2152 | "md/raid1: cannot register " | |
2153 | "%s for %s\n", | |
2154 | nm, mdname(mddev)); | |
6ea9c07c | 2155 | } |
a88aa786 N |
2156 | if (rdev) |
2157 | newmirrors[d2++].rdev = rdev; | |
2158 | } | |
1da177e4 LT |
2159 | kfree(conf->mirrors); |
2160 | conf->mirrors = newmirrors; | |
2161 | kfree(conf->poolinfo); | |
2162 | conf->poolinfo = newpoolinfo; | |
2163 | ||
c04be0aa | 2164 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2165 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2166 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2167 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2168 | mddev->delta_disks = 0; |
1da177e4 | 2169 | |
6ea9c07c | 2170 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2171 | lower_barrier(conf); |
1da177e4 LT |
2172 | |
2173 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2174 | md_wakeup_thread(mddev->thread); | |
2175 | ||
2176 | mempool_destroy(oldpool); | |
2177 | return 0; | |
2178 | } | |
2179 | ||
500af87a | 2180 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 N |
2181 | { |
2182 | conf_t *conf = mddev_to_conf(mddev); | |
2183 | ||
2184 | switch(state) { | |
9e6603da | 2185 | case 1: |
17999be4 | 2186 | raise_barrier(conf); |
36fa3063 | 2187 | break; |
9e6603da | 2188 | case 0: |
17999be4 | 2189 | lower_barrier(conf); |
36fa3063 N |
2190 | break; |
2191 | } | |
36fa3063 N |
2192 | } |
2193 | ||
1da177e4 | 2194 | |
2604b703 | 2195 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2196 | { |
2197 | .name = "raid1", | |
2604b703 | 2198 | .level = 1, |
1da177e4 LT |
2199 | .owner = THIS_MODULE, |
2200 | .make_request = make_request, | |
2201 | .run = run, | |
2202 | .stop = stop, | |
2203 | .status = status, | |
2204 | .error_handler = error, | |
2205 | .hot_add_disk = raid1_add_disk, | |
2206 | .hot_remove_disk= raid1_remove_disk, | |
2207 | .spare_active = raid1_spare_active, | |
2208 | .sync_request = sync_request, | |
2209 | .resize = raid1_resize, | |
63c70c4f | 2210 | .check_reshape = raid1_reshape, |
36fa3063 | 2211 | .quiesce = raid1_quiesce, |
1da177e4 LT |
2212 | }; |
2213 | ||
2214 | static int __init raid_init(void) | |
2215 | { | |
2604b703 | 2216 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2217 | } |
2218 | ||
2219 | static void raid_exit(void) | |
2220 | { | |
2604b703 | 2221 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2222 | } |
2223 | ||
2224 | module_init(raid_init); | |
2225 | module_exit(raid_exit); | |
2226 | MODULE_LICENSE("GPL"); | |
2227 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ | |
d9d166c2 | 2228 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2229 | MODULE_ALIAS("md-level-1"); |