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 | ||
17999be4 N |
595 | /* Barriers.... |
596 | * Sometimes we need to suspend IO while we do something else, | |
597 | * either some resync/recovery, or reconfigure the array. | |
598 | * To do this we raise a 'barrier'. | |
599 | * The 'barrier' is a counter that can be raised multiple times | |
600 | * to count how many activities are happening which preclude | |
601 | * normal IO. | |
602 | * We can only raise the barrier if there is no pending IO. | |
603 | * i.e. if nr_pending == 0. | |
604 | * We choose only to raise the barrier if no-one is waiting for the | |
605 | * barrier to go down. This means that as soon as an IO request | |
606 | * is ready, no other operations which require a barrier will start | |
607 | * until the IO request has had a chance. | |
608 | * | |
609 | * So: regular IO calls 'wait_barrier'. When that returns there | |
610 | * is no backgroup IO happening, It must arrange to call | |
611 | * allow_barrier when it has finished its IO. | |
612 | * backgroup IO calls must call raise_barrier. Once that returns | |
613 | * there is no normal IO happeing. It must arrange to call | |
614 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
615 | */ |
616 | #define RESYNC_DEPTH 32 | |
617 | ||
17999be4 | 618 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
619 | { |
620 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
621 | |
622 | /* Wait until no block IO is waiting */ | |
623 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
624 | conf->resync_lock, | |
625 | raid1_unplug(conf->mddev->queue)); | |
626 | ||
627 | /* block any new IO from starting */ | |
628 | conf->barrier++; | |
629 | ||
630 | /* No wait for all pending IO to complete */ | |
631 | wait_event_lock_irq(conf->wait_barrier, | |
632 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
633 | conf->resync_lock, | |
634 | raid1_unplug(conf->mddev->queue)); | |
635 | ||
636 | spin_unlock_irq(&conf->resync_lock); | |
637 | } | |
638 | ||
639 | static void lower_barrier(conf_t *conf) | |
640 | { | |
641 | unsigned long flags; | |
642 | spin_lock_irqsave(&conf->resync_lock, flags); | |
643 | conf->barrier--; | |
644 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
645 | wake_up(&conf->wait_barrier); | |
646 | } | |
647 | ||
648 | static void wait_barrier(conf_t *conf) | |
649 | { | |
650 | spin_lock_irq(&conf->resync_lock); | |
651 | if (conf->barrier) { | |
652 | conf->nr_waiting++; | |
653 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
654 | conf->resync_lock, | |
655 | raid1_unplug(conf->mddev->queue)); | |
656 | conf->nr_waiting--; | |
1da177e4 | 657 | } |
17999be4 | 658 | conf->nr_pending++; |
1da177e4 LT |
659 | spin_unlock_irq(&conf->resync_lock); |
660 | } | |
661 | ||
17999be4 N |
662 | static void allow_barrier(conf_t *conf) |
663 | { | |
664 | unsigned long flags; | |
665 | spin_lock_irqsave(&conf->resync_lock, flags); | |
666 | conf->nr_pending--; | |
667 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
668 | wake_up(&conf->wait_barrier); | |
669 | } | |
670 | ||
ddaf22ab N |
671 | static void freeze_array(conf_t *conf) |
672 | { | |
673 | /* stop syncio and normal IO and wait for everything to | |
674 | * go quite. | |
675 | * We increment barrier and nr_waiting, and then | |
676 | * wait until barrier+nr_pending match nr_queued+2 | |
677 | */ | |
678 | spin_lock_irq(&conf->resync_lock); | |
679 | conf->barrier++; | |
680 | conf->nr_waiting++; | |
681 | wait_event_lock_irq(conf->wait_barrier, | |
682 | conf->barrier+conf->nr_pending == conf->nr_queued+2, | |
683 | conf->resync_lock, | |
684 | raid1_unplug(conf->mddev->queue)); | |
685 | spin_unlock_irq(&conf->resync_lock); | |
686 | } | |
687 | static void unfreeze_array(conf_t *conf) | |
688 | { | |
689 | /* reverse the effect of the freeze */ | |
690 | spin_lock_irq(&conf->resync_lock); | |
691 | conf->barrier--; | |
692 | conf->nr_waiting--; | |
693 | wake_up(&conf->wait_barrier); | |
694 | spin_unlock_irq(&conf->resync_lock); | |
695 | } | |
696 | ||
17999be4 | 697 | |
4b6d287f N |
698 | /* duplicate the data pages for behind I/O */ |
699 | static struct page **alloc_behind_pages(struct bio *bio) | |
700 | { | |
701 | int i; | |
702 | struct bio_vec *bvec; | |
9ffae0cf | 703 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *), |
4b6d287f N |
704 | GFP_NOIO); |
705 | if (unlikely(!pages)) | |
706 | goto do_sync_io; | |
707 | ||
4b6d287f N |
708 | bio_for_each_segment(bvec, bio, i) { |
709 | pages[i] = alloc_page(GFP_NOIO); | |
710 | if (unlikely(!pages[i])) | |
711 | goto do_sync_io; | |
712 | memcpy(kmap(pages[i]) + bvec->bv_offset, | |
713 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
714 | kunmap(pages[i]); | |
715 | kunmap(bvec->bv_page); | |
716 | } | |
717 | ||
718 | return pages; | |
719 | ||
720 | do_sync_io: | |
721 | if (pages) | |
722 | for (i = 0; i < bio->bi_vcnt && pages[i]; i++) | |
2d1f3b5d | 723 | put_page(pages[i]); |
4b6d287f N |
724 | kfree(pages); |
725 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); | |
726 | return NULL; | |
727 | } | |
728 | ||
165125e1 | 729 | static int make_request(struct request_queue *q, struct bio * bio) |
1da177e4 LT |
730 | { |
731 | mddev_t *mddev = q->queuedata; | |
732 | conf_t *conf = mddev_to_conf(mddev); | |
733 | mirror_info_t *mirror; | |
734 | r1bio_t *r1_bio; | |
735 | struct bio *read_bio; | |
191ea9b2 | 736 | int i, targets = 0, disks; |
1da177e4 | 737 | mdk_rdev_t *rdev; |
191ea9b2 N |
738 | struct bitmap *bitmap = mddev->bitmap; |
739 | unsigned long flags; | |
740 | struct bio_list bl; | |
4b6d287f | 741 | struct page **behind_pages = NULL; |
a362357b | 742 | const int rw = bio_data_dir(bio); |
e3881a68 | 743 | const int do_sync = bio_sync(bio); |
a9701a30 | 744 | int do_barriers; |
191ea9b2 | 745 | |
1da177e4 LT |
746 | /* |
747 | * Register the new request and wait if the reconstruction | |
748 | * thread has put up a bar for new requests. | |
749 | * Continue immediately if no resync is active currently. | |
62de608d N |
750 | * We test barriers_work *after* md_write_start as md_write_start |
751 | * may cause the first superblock write, and that will check out | |
752 | * if barriers work. | |
1da177e4 | 753 | */ |
62de608d | 754 | |
3d310eb7 N |
755 | md_write_start(mddev, bio); /* wait on superblock update early */ |
756 | ||
62de608d N |
757 | if (unlikely(!mddev->barriers_work && bio_barrier(bio))) { |
758 | if (rw == WRITE) | |
759 | md_write_end(mddev); | |
6712ecf8 | 760 | bio_endio(bio, -EOPNOTSUPP); |
62de608d N |
761 | return 0; |
762 | } | |
763 | ||
17999be4 | 764 | wait_barrier(conf); |
1da177e4 | 765 | |
a362357b JA |
766 | disk_stat_inc(mddev->gendisk, ios[rw]); |
767 | disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio)); | |
1da177e4 LT |
768 | |
769 | /* | |
770 | * make_request() can abort the operation when READA is being | |
771 | * used and no empty request is available. | |
772 | * | |
773 | */ | |
774 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
775 | ||
776 | r1_bio->master_bio = bio; | |
777 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 778 | r1_bio->state = 0; |
1da177e4 LT |
779 | r1_bio->mddev = mddev; |
780 | r1_bio->sector = bio->bi_sector; | |
781 | ||
a362357b | 782 | if (rw == READ) { |
1da177e4 LT |
783 | /* |
784 | * read balancing logic: | |
785 | */ | |
786 | int rdisk = read_balance(conf, r1_bio); | |
787 | ||
788 | if (rdisk < 0) { | |
789 | /* couldn't find anywhere to read from */ | |
790 | raid_end_bio_io(r1_bio); | |
791 | return 0; | |
792 | } | |
793 | mirror = conf->mirrors + rdisk; | |
794 | ||
795 | r1_bio->read_disk = rdisk; | |
796 | ||
797 | read_bio = bio_clone(bio, GFP_NOIO); | |
798 | ||
799 | r1_bio->bios[rdisk] = read_bio; | |
800 | ||
801 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
802 | read_bio->bi_bdev = mirror->rdev->bdev; | |
803 | read_bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 804 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
805 | read_bio->bi_private = r1_bio; |
806 | ||
807 | generic_make_request(read_bio); | |
808 | return 0; | |
809 | } | |
810 | ||
811 | /* | |
812 | * WRITE: | |
813 | */ | |
814 | /* first select target devices under spinlock and | |
815 | * inc refcount on their rdev. Record them by setting | |
816 | * bios[x] to bio | |
817 | */ | |
818 | disks = conf->raid_disks; | |
191ea9b2 N |
819 | #if 0 |
820 | { static int first=1; | |
821 | if (first) printk("First Write sector %llu disks %d\n", | |
822 | (unsigned long long)r1_bio->sector, disks); | |
823 | first = 0; | |
824 | } | |
825 | #endif | |
1da177e4 LT |
826 | rcu_read_lock(); |
827 | for (i = 0; i < disks; i++) { | |
d6065f7b | 828 | if ((rdev=rcu_dereference(conf->mirrors[i].rdev)) != NULL && |
b2d444d7 | 829 | !test_bit(Faulty, &rdev->flags)) { |
1da177e4 | 830 | atomic_inc(&rdev->nr_pending); |
b2d444d7 | 831 | if (test_bit(Faulty, &rdev->flags)) { |
03c902e1 | 832 | rdev_dec_pending(rdev, mddev); |
1da177e4 LT |
833 | r1_bio->bios[i] = NULL; |
834 | } else | |
835 | r1_bio->bios[i] = bio; | |
191ea9b2 | 836 | targets++; |
1da177e4 LT |
837 | } else |
838 | r1_bio->bios[i] = NULL; | |
839 | } | |
840 | rcu_read_unlock(); | |
841 | ||
4b6d287f N |
842 | BUG_ON(targets == 0); /* we never fail the last device */ |
843 | ||
191ea9b2 N |
844 | if (targets < conf->raid_disks) { |
845 | /* array is degraded, we will not clear the bitmap | |
846 | * on I/O completion (see raid1_end_write_request) */ | |
847 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
848 | } | |
849 | ||
4b6d287f N |
850 | /* do behind I/O ? */ |
851 | if (bitmap && | |
852 | atomic_read(&bitmap->behind_writes) < bitmap->max_write_behind && | |
853 | (behind_pages = alloc_behind_pages(bio)) != NULL) | |
854 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
855 | ||
191ea9b2 | 856 | atomic_set(&r1_bio->remaining, 0); |
4b6d287f | 857 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 858 | |
04b857f7 | 859 | do_barriers = bio_barrier(bio); |
a9701a30 N |
860 | if (do_barriers) |
861 | set_bit(R1BIO_Barrier, &r1_bio->state); | |
862 | ||
191ea9b2 | 863 | bio_list_init(&bl); |
1da177e4 LT |
864 | for (i = 0; i < disks; i++) { |
865 | struct bio *mbio; | |
866 | if (!r1_bio->bios[i]) | |
867 | continue; | |
868 | ||
869 | mbio = bio_clone(bio, GFP_NOIO); | |
870 | r1_bio->bios[i] = mbio; | |
871 | ||
872 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; | |
873 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
874 | mbio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 875 | mbio->bi_rw = WRITE | do_barriers | do_sync; |
1da177e4 LT |
876 | mbio->bi_private = r1_bio; |
877 | ||
4b6d287f N |
878 | if (behind_pages) { |
879 | struct bio_vec *bvec; | |
880 | int j; | |
881 | ||
882 | /* Yes, I really want the '__' version so that | |
883 | * we clear any unused pointer in the io_vec, rather | |
884 | * than leave them unchanged. This is important | |
885 | * because when we come to free the pages, we won't | |
886 | * know the originial bi_idx, so we just free | |
887 | * them all | |
888 | */ | |
889 | __bio_for_each_segment(bvec, mbio, j, 0) | |
890 | bvec->bv_page = behind_pages[j]; | |
891 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) | |
892 | atomic_inc(&r1_bio->behind_remaining); | |
893 | } | |
894 | ||
1da177e4 | 895 | atomic_inc(&r1_bio->remaining); |
1da177e4 | 896 | |
191ea9b2 | 897 | bio_list_add(&bl, mbio); |
1da177e4 | 898 | } |
4b6d287f | 899 | kfree(behind_pages); /* the behind pages are attached to the bios now */ |
1da177e4 | 900 | |
4b6d287f N |
901 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
902 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
191ea9b2 N |
903 | spin_lock_irqsave(&conf->device_lock, flags); |
904 | bio_list_merge(&conf->pending_bio_list, &bl); | |
905 | bio_list_init(&bl); | |
906 | ||
907 | blk_plug_device(mddev->queue); | |
908 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
909 | ||
e3881a68 LE |
910 | if (do_sync) |
911 | md_wakeup_thread(mddev->thread); | |
191ea9b2 N |
912 | #if 0 |
913 | while ((bio = bio_list_pop(&bl)) != NULL) | |
914 | generic_make_request(bio); | |
915 | #endif | |
916 | ||
1da177e4 LT |
917 | return 0; |
918 | } | |
919 | ||
920 | static void status(struct seq_file *seq, mddev_t *mddev) | |
921 | { | |
922 | conf_t *conf = mddev_to_conf(mddev); | |
923 | int i; | |
924 | ||
925 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 926 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
927 | rcu_read_lock(); |
928 | for (i = 0; i < conf->raid_disks; i++) { | |
929 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 930 | seq_printf(seq, "%s", |
ddac7c7e N |
931 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
932 | } | |
933 | rcu_read_unlock(); | |
1da177e4 LT |
934 | seq_printf(seq, "]"); |
935 | } | |
936 | ||
937 | ||
938 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
939 | { | |
940 | char b[BDEVNAME_SIZE]; | |
941 | conf_t *conf = mddev_to_conf(mddev); | |
942 | ||
943 | /* | |
944 | * If it is not operational, then we have already marked it as dead | |
945 | * else if it is the last working disks, ignore the error, let the | |
946 | * next level up know. | |
947 | * else mark the drive as failed | |
948 | */ | |
b2d444d7 | 949 | if (test_bit(In_sync, &rdev->flags) |
11ce99e6 | 950 | && (conf->raid_disks - mddev->degraded) == 1) |
1da177e4 LT |
951 | /* |
952 | * Don't fail the drive, act as though we were just a | |
953 | * normal single drive | |
954 | */ | |
955 | return; | |
c04be0aa N |
956 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
957 | unsigned long flags; | |
958 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 959 | mddev->degraded++; |
dd00a99e | 960 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 961 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
962 | /* |
963 | * if recovery is running, make sure it aborts. | |
964 | */ | |
965 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
dd00a99e N |
966 | } else |
967 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 968 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 LT |
969 | printk(KERN_ALERT "raid1: Disk failure on %s, disabling device. \n" |
970 | " Operation continuing on %d devices\n", | |
11ce99e6 | 971 | bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); |
1da177e4 LT |
972 | } |
973 | ||
974 | static void print_conf(conf_t *conf) | |
975 | { | |
976 | int i; | |
1da177e4 LT |
977 | |
978 | printk("RAID1 conf printout:\n"); | |
979 | if (!conf) { | |
980 | printk("(!conf)\n"); | |
981 | return; | |
982 | } | |
11ce99e6 | 983 | printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
984 | conf->raid_disks); |
985 | ||
ddac7c7e | 986 | rcu_read_lock(); |
1da177e4 LT |
987 | for (i = 0; i < conf->raid_disks; i++) { |
988 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
989 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
990 | if (rdev) | |
1da177e4 | 991 | printk(" disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
992 | i, !test_bit(In_sync, &rdev->flags), |
993 | !test_bit(Faulty, &rdev->flags), | |
994 | bdevname(rdev->bdev,b)); | |
1da177e4 | 995 | } |
ddac7c7e | 996 | rcu_read_unlock(); |
1da177e4 LT |
997 | } |
998 | ||
999 | static void close_sync(conf_t *conf) | |
1000 | { | |
17999be4 N |
1001 | wait_barrier(conf); |
1002 | allow_barrier(conf); | |
1da177e4 LT |
1003 | |
1004 | mempool_destroy(conf->r1buf_pool); | |
1005 | conf->r1buf_pool = NULL; | |
1006 | } | |
1007 | ||
1008 | static int raid1_spare_active(mddev_t *mddev) | |
1009 | { | |
1010 | int i; | |
1011 | conf_t *conf = mddev->private; | |
1da177e4 LT |
1012 | |
1013 | /* | |
1014 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1015 | * and mark them readable. |
1016 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1017 | */ |
1018 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1019 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1020 | if (rdev | |
1021 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa N |
1022 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
1023 | unsigned long flags; | |
1024 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1025 | mddev->degraded--; |
c04be0aa | 1026 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1027 | } |
1028 | } | |
1029 | ||
1030 | print_conf(conf); | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | ||
1035 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1036 | { | |
1037 | conf_t *conf = mddev->private; | |
1038 | int found = 0; | |
41158c7e | 1039 | int mirror = 0; |
1da177e4 LT |
1040 | mirror_info_t *p; |
1041 | ||
1042 | for (mirror=0; mirror < mddev->raid_disks; mirror++) | |
1043 | if ( !(p=conf->mirrors+mirror)->rdev) { | |
1044 | ||
1045 | blk_queue_stack_limits(mddev->queue, | |
1046 | rdev->bdev->bd_disk->queue); | |
1047 | /* as we don't honour merge_bvec_fn, we must never risk | |
1048 | * violating it, so limit ->max_sector to one PAGE, as | |
1049 | * a one page request is never in violation. | |
1050 | */ | |
1051 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1052 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1053 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1054 | ||
1055 | p->head_position = 0; | |
1056 | rdev->raid_disk = mirror; | |
1057 | found = 1; | |
6aea114a N |
1058 | /* As all devices are equivalent, we don't need a full recovery |
1059 | * if this was recently any drive of the array | |
1060 | */ | |
1061 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1062 | conf->fullsync = 1; |
d6065f7b | 1063 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1064 | break; |
1065 | } | |
1066 | ||
1067 | print_conf(conf); | |
1068 | return found; | |
1069 | } | |
1070 | ||
1071 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1072 | { | |
1073 | conf_t *conf = mddev->private; | |
1074 | int err = 0; | |
1075 | mdk_rdev_t *rdev; | |
1076 | mirror_info_t *p = conf->mirrors+ number; | |
1077 | ||
1078 | print_conf(conf); | |
1079 | rdev = p->rdev; | |
1080 | if (rdev) { | |
b2d444d7 | 1081 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1082 | atomic_read(&rdev->nr_pending)) { |
1083 | err = -EBUSY; | |
1084 | goto abort; | |
1085 | } | |
1086 | p->rdev = NULL; | |
fbd568a3 | 1087 | synchronize_rcu(); |
1da177e4 LT |
1088 | if (atomic_read(&rdev->nr_pending)) { |
1089 | /* lost the race, try later */ | |
1090 | err = -EBUSY; | |
1091 | p->rdev = rdev; | |
1092 | } | |
1093 | } | |
1094 | abort: | |
1095 | ||
1096 | print_conf(conf); | |
1097 | return err; | |
1098 | } | |
1099 | ||
1100 | ||
6712ecf8 | 1101 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1102 | { |
1da177e4 | 1103 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); |
d11c171e | 1104 | int i; |
1da177e4 | 1105 | |
d11c171e N |
1106 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1107 | if (r1_bio->bios[i] == bio) | |
1108 | break; | |
1109 | BUG_ON(i < 0); | |
1110 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1111 | /* |
1112 | * we have read a block, now it needs to be re-written, | |
1113 | * or re-read if the read failed. | |
1114 | * We don't do much here, just schedule handling by raid1d | |
1115 | */ | |
69382e85 | 1116 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1117 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1118 | |
1119 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1120 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1121 | } |
1122 | ||
6712ecf8 | 1123 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1124 | { |
1125 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1126 | r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); | |
1127 | mddev_t *mddev = r1_bio->mddev; | |
1128 | conf_t *conf = mddev_to_conf(mddev); | |
1129 | int i; | |
1130 | int mirror=0; | |
1131 | ||
1da177e4 LT |
1132 | for (i = 0; i < conf->raid_disks; i++) |
1133 | if (r1_bio->bios[i] == bio) { | |
1134 | mirror = i; | |
1135 | break; | |
1136 | } | |
6b1117d5 N |
1137 | if (!uptodate) { |
1138 | int sync_blocks = 0; | |
1139 | sector_t s = r1_bio->sector; | |
1140 | long sectors_to_go = r1_bio->sectors; | |
1141 | /* make sure these bits doesn't get cleared. */ | |
1142 | do { | |
5e3db645 | 1143 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1144 | &sync_blocks, 1); |
1145 | s += sync_blocks; | |
1146 | sectors_to_go -= sync_blocks; | |
1147 | } while (sectors_to_go > 0); | |
1da177e4 | 1148 | md_error(mddev, conf->mirrors[mirror].rdev); |
6b1117d5 | 1149 | } |
e3b9703e | 1150 | |
1da177e4 LT |
1151 | update_head_pos(mirror, r1_bio); |
1152 | ||
1153 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
1154 | md_done_sync(mddev, r1_bio->sectors, uptodate); | |
1155 | put_buf(r1_bio); | |
1156 | } | |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1160 | { | |
1161 | conf_t *conf = mddev_to_conf(mddev); | |
1162 | int i; | |
1163 | int disks = conf->raid_disks; | |
1164 | struct bio *bio, *wbio; | |
1165 | ||
1166 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1167 | ||
69382e85 | 1168 | |
d11c171e N |
1169 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
1170 | /* We have read all readable devices. If we haven't | |
1171 | * got the block, then there is no hope left. | |
1172 | * If we have, then we want to do a comparison | |
1173 | * and skip the write if everything is the same. | |
1174 | * If any blocks failed to read, then we need to | |
1175 | * attempt an over-write | |
1176 | */ | |
1177 | int primary; | |
1178 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
1179 | for (i=0; i<mddev->raid_disks; i++) | |
1180 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) | |
1181 | md_error(mddev, conf->mirrors[i].rdev); | |
1182 | ||
1183 | md_done_sync(mddev, r1_bio->sectors, 1); | |
1184 | put_buf(r1_bio); | |
1185 | return; | |
1186 | } | |
1187 | for (primary=0; primary<mddev->raid_disks; primary++) | |
1188 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && | |
1189 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1190 | r1_bio->bios[primary]->bi_end_io = NULL; | |
03c902e1 | 1191 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); |
d11c171e N |
1192 | break; |
1193 | } | |
1194 | r1_bio->read_disk = primary; | |
1195 | for (i=0; i<mddev->raid_disks; i++) | |
ed456662 | 1196 | if (r1_bio->bios[i]->bi_end_io == end_sync_read) { |
d11c171e N |
1197 | int j; |
1198 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1199 | struct bio *pbio = r1_bio->bios[primary]; | |
1200 | struct bio *sbio = r1_bio->bios[i]; | |
ed456662 MA |
1201 | |
1202 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1203 | for (j = vcnt; j-- ; ) { | |
1204 | struct page *p, *s; | |
1205 | p = pbio->bi_io_vec[j].bv_page; | |
1206 | s = sbio->bi_io_vec[j].bv_page; | |
1207 | if (memcmp(page_address(p), | |
1208 | page_address(s), | |
1209 | PAGE_SIZE)) | |
1210 | break; | |
1211 | } | |
1212 | } else | |
1213 | j = 0; | |
d11c171e N |
1214 | if (j >= 0) |
1215 | mddev->resync_mismatches += r1_bio->sectors; | |
cf7a4416 N |
1216 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1217 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
d11c171e | 1218 | sbio->bi_end_io = NULL; |
03c902e1 N |
1219 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); |
1220 | } else { | |
d11c171e N |
1221 | /* fixup the bio for reuse */ |
1222 | sbio->bi_vcnt = vcnt; | |
1223 | sbio->bi_size = r1_bio->sectors << 9; | |
1224 | sbio->bi_idx = 0; | |
1225 | sbio->bi_phys_segments = 0; | |
1226 | sbio->bi_hw_segments = 0; | |
1227 | sbio->bi_hw_front_size = 0; | |
1228 | sbio->bi_hw_back_size = 0; | |
1229 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1230 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1231 | sbio->bi_next = NULL; | |
1232 | sbio->bi_sector = r1_bio->sector + | |
1233 | conf->mirrors[i].rdev->data_offset; | |
1234 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
3eda22d1 N |
1235 | for (j = 0; j < vcnt ; j++) |
1236 | memcpy(page_address(sbio->bi_io_vec[j].bv_page), | |
1237 | page_address(pbio->bi_io_vec[j].bv_page), | |
1238 | PAGE_SIZE); | |
1239 | ||
d11c171e N |
1240 | } |
1241 | } | |
1242 | } | |
1da177e4 | 1243 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { |
69382e85 N |
1244 | /* ouch - failed to read all of that. |
1245 | * Try some synchronous reads of other devices to get | |
1246 | * good data, much like with normal read errors. Only | |
ddac7c7e | 1247 | * read into the pages we already have so we don't |
69382e85 N |
1248 | * need to re-issue the read request. |
1249 | * We don't need to freeze the array, because being in an | |
1250 | * active sync request, there is no normal IO, and | |
1251 | * no overlapping syncs. | |
1da177e4 | 1252 | */ |
69382e85 N |
1253 | sector_t sect = r1_bio->sector; |
1254 | int sectors = r1_bio->sectors; | |
1255 | int idx = 0; | |
1256 | ||
1257 | while(sectors) { | |
1258 | int s = sectors; | |
1259 | int d = r1_bio->read_disk; | |
1260 | int success = 0; | |
1261 | mdk_rdev_t *rdev; | |
1262 | ||
1263 | if (s > (PAGE_SIZE>>9)) | |
1264 | s = PAGE_SIZE >> 9; | |
1265 | do { | |
1266 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
ddac7c7e N |
1267 | /* No rcu protection needed here devices |
1268 | * can only be removed when no resync is | |
1269 | * active, and resync is currently active | |
1270 | */ | |
69382e85 N |
1271 | rdev = conf->mirrors[d].rdev; |
1272 | if (sync_page_io(rdev->bdev, | |
1273 | sect + rdev->data_offset, | |
1274 | s<<9, | |
1275 | bio->bi_io_vec[idx].bv_page, | |
1276 | READ)) { | |
1277 | success = 1; | |
1278 | break; | |
1279 | } | |
1280 | } | |
1281 | d++; | |
1282 | if (d == conf->raid_disks) | |
1283 | d = 0; | |
1284 | } while (!success && d != r1_bio->read_disk); | |
1285 | ||
1286 | if (success) { | |
097426f6 | 1287 | int start = d; |
69382e85 N |
1288 | /* write it back and re-read */ |
1289 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
1290 | while (d != r1_bio->read_disk) { | |
1291 | if (d == 0) | |
1292 | d = conf->raid_disks; | |
1293 | d--; | |
1294 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1295 | continue; | |
1296 | rdev = conf->mirrors[d].rdev; | |
4dbcdc75 | 1297 | atomic_add(s, &rdev->corrected_errors); |
69382e85 N |
1298 | if (sync_page_io(rdev->bdev, |
1299 | sect + rdev->data_offset, | |
1300 | s<<9, | |
1301 | bio->bi_io_vec[idx].bv_page, | |
097426f6 N |
1302 | WRITE) == 0) |
1303 | md_error(mddev, rdev); | |
1304 | } | |
1305 | d = start; | |
1306 | while (d != r1_bio->read_disk) { | |
1307 | if (d == 0) | |
1308 | d = conf->raid_disks; | |
1309 | d--; | |
1310 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1311 | continue; | |
1312 | rdev = conf->mirrors[d].rdev; | |
1313 | if (sync_page_io(rdev->bdev, | |
69382e85 N |
1314 | sect + rdev->data_offset, |
1315 | s<<9, | |
1316 | bio->bi_io_vec[idx].bv_page, | |
097426f6 | 1317 | READ) == 0) |
69382e85 | 1318 | md_error(mddev, rdev); |
69382e85 N |
1319 | } |
1320 | } else { | |
1321 | char b[BDEVNAME_SIZE]; | |
1322 | /* Cannot read from anywhere, array is toast */ | |
1323 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1324 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" | |
1325 | " for block %llu\n", | |
1326 | bdevname(bio->bi_bdev,b), | |
1327 | (unsigned long long)r1_bio->sector); | |
1328 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1329 | put_buf(r1_bio); | |
1330 | return; | |
1331 | } | |
1332 | sectors -= s; | |
1333 | sect += s; | |
1334 | idx ++; | |
1335 | } | |
1da177e4 | 1336 | } |
d11c171e N |
1337 | |
1338 | /* | |
1339 | * schedule writes | |
1340 | */ | |
1da177e4 LT |
1341 | atomic_set(&r1_bio->remaining, 1); |
1342 | for (i = 0; i < disks ; i++) { | |
1343 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1344 | if (wbio->bi_end_io == NULL || |
1345 | (wbio->bi_end_io == end_sync_read && | |
1346 | (i == r1_bio->read_disk || | |
1347 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1348 | continue; |
1349 | ||
3e198f78 N |
1350 | wbio->bi_rw = WRITE; |
1351 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1352 | atomic_inc(&r1_bio->remaining); |
1353 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1354 | |
1da177e4 LT |
1355 | generic_make_request(wbio); |
1356 | } | |
1357 | ||
1358 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1359 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1360 | md_done_sync(mddev, r1_bio->sectors, 1); |
1361 | put_buf(r1_bio); | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * This is a kernel thread which: | |
1367 | * | |
1368 | * 1. Retries failed read operations on working mirrors. | |
1369 | * 2. Updates the raid superblock when problems encounter. | |
1370 | * 3. Performs writes following reads for array syncronising. | |
1371 | */ | |
1372 | ||
867868fb N |
1373 | static void fix_read_error(conf_t *conf, int read_disk, |
1374 | sector_t sect, int sectors) | |
1375 | { | |
1376 | mddev_t *mddev = conf->mddev; | |
1377 | while(sectors) { | |
1378 | int s = sectors; | |
1379 | int d = read_disk; | |
1380 | int success = 0; | |
1381 | int start; | |
1382 | mdk_rdev_t *rdev; | |
1383 | ||
1384 | if (s > (PAGE_SIZE>>9)) | |
1385 | s = PAGE_SIZE >> 9; | |
1386 | ||
1387 | do { | |
1388 | /* Note: no rcu protection needed here | |
1389 | * as this is synchronous in the raid1d thread | |
1390 | * which is the thread that might remove | |
1391 | * a device. If raid1d ever becomes multi-threaded.... | |
1392 | */ | |
1393 | rdev = conf->mirrors[d].rdev; | |
1394 | if (rdev && | |
1395 | test_bit(In_sync, &rdev->flags) && | |
1396 | sync_page_io(rdev->bdev, | |
1397 | sect + rdev->data_offset, | |
1398 | s<<9, | |
1399 | conf->tmppage, READ)) | |
1400 | success = 1; | |
1401 | else { | |
1402 | d++; | |
1403 | if (d == conf->raid_disks) | |
1404 | d = 0; | |
1405 | } | |
1406 | } while (!success && d != read_disk); | |
1407 | ||
1408 | if (!success) { | |
1409 | /* Cannot read from anywhere -- bye bye array */ | |
1410 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1411 | break; | |
1412 | } | |
1413 | /* write it back and re-read */ | |
1414 | start = d; | |
1415 | while (d != read_disk) { | |
1416 | if (d==0) | |
1417 | d = conf->raid_disks; | |
1418 | d--; | |
1419 | rdev = conf->mirrors[d].rdev; | |
1420 | if (rdev && | |
1421 | test_bit(In_sync, &rdev->flags)) { | |
1422 | if (sync_page_io(rdev->bdev, | |
1423 | sect + rdev->data_offset, | |
1424 | s<<9, conf->tmppage, WRITE) | |
1425 | == 0) | |
1426 | /* Well, this device is dead */ | |
1427 | md_error(mddev, rdev); | |
1428 | } | |
1429 | } | |
1430 | d = start; | |
1431 | while (d != read_disk) { | |
1432 | char b[BDEVNAME_SIZE]; | |
1433 | if (d==0) | |
1434 | d = conf->raid_disks; | |
1435 | d--; | |
1436 | rdev = conf->mirrors[d].rdev; | |
1437 | if (rdev && | |
1438 | test_bit(In_sync, &rdev->flags)) { | |
1439 | if (sync_page_io(rdev->bdev, | |
1440 | sect + rdev->data_offset, | |
1441 | s<<9, conf->tmppage, READ) | |
1442 | == 0) | |
1443 | /* Well, this device is dead */ | |
1444 | md_error(mddev, rdev); | |
1445 | else { | |
1446 | atomic_add(s, &rdev->corrected_errors); | |
1447 | printk(KERN_INFO | |
1448 | "raid1:%s: read error corrected " | |
1449 | "(%d sectors at %llu on %s)\n", | |
1450 | mdname(mddev), s, | |
969b755a RD |
1451 | (unsigned long long)(sect + |
1452 | rdev->data_offset), | |
867868fb N |
1453 | bdevname(rdev->bdev, b)); |
1454 | } | |
1455 | } | |
1456 | } | |
1457 | sectors -= s; | |
1458 | sect += s; | |
1459 | } | |
1460 | } | |
1461 | ||
1da177e4 LT |
1462 | static void raid1d(mddev_t *mddev) |
1463 | { | |
1464 | r1bio_t *r1_bio; | |
1465 | struct bio *bio; | |
1466 | unsigned long flags; | |
1467 | conf_t *conf = mddev_to_conf(mddev); | |
1468 | struct list_head *head = &conf->retry_list; | |
1469 | int unplug=0; | |
1470 | mdk_rdev_t *rdev; | |
1471 | ||
1472 | md_check_recovery(mddev); | |
1da177e4 LT |
1473 | |
1474 | for (;;) { | |
1475 | char b[BDEVNAME_SIZE]; | |
1476 | spin_lock_irqsave(&conf->device_lock, flags); | |
191ea9b2 N |
1477 | |
1478 | if (conf->pending_bio_list.head) { | |
1479 | bio = bio_list_get(&conf->pending_bio_list); | |
1480 | blk_remove_plug(mddev->queue); | |
1481 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1482 | /* flush any pending bitmap writes to disk before proceeding w/ I/O */ | |
4ad13663 | 1483 | bitmap_unplug(mddev->bitmap); |
191ea9b2 N |
1484 | |
1485 | while (bio) { /* submit pending writes */ | |
1486 | struct bio *next = bio->bi_next; | |
1487 | bio->bi_next = NULL; | |
1488 | generic_make_request(bio); | |
1489 | bio = next; | |
1490 | } | |
1491 | unplug = 1; | |
1492 | ||
1493 | continue; | |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | if (list_empty(head)) |
1497 | break; | |
1498 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); | |
1499 | list_del(head->prev); | |
ddaf22ab | 1500 | conf->nr_queued--; |
1da177e4 LT |
1501 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1502 | ||
1503 | mddev = r1_bio->mddev; | |
1504 | conf = mddev_to_conf(mddev); | |
1505 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { | |
1506 | sync_request_write(mddev, r1_bio); | |
1507 | unplug = 1; | |
a9701a30 N |
1508 | } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) { |
1509 | /* some requests in the r1bio were BIO_RW_BARRIER | |
bea27718 | 1510 | * requests which failed with -EOPNOTSUPP. Hohumm.. |
a9701a30 N |
1511 | * Better resubmit without the barrier. |
1512 | * We know which devices to resubmit for, because | |
1513 | * all others have had their bios[] entry cleared. | |
5e7dd2ab | 1514 | * We already have a nr_pending reference on these rdevs. |
a9701a30 N |
1515 | */ |
1516 | int i; | |
e3881a68 | 1517 | const int do_sync = bio_sync(r1_bio->master_bio); |
a9701a30 N |
1518 | clear_bit(R1BIO_BarrierRetry, &r1_bio->state); |
1519 | clear_bit(R1BIO_Barrier, &r1_bio->state); | |
2f889129 N |
1520 | for (i=0; i < conf->raid_disks; i++) |
1521 | if (r1_bio->bios[i]) | |
1522 | atomic_inc(&r1_bio->remaining); | |
a9701a30 N |
1523 | for (i=0; i < conf->raid_disks; i++) |
1524 | if (r1_bio->bios[i]) { | |
1525 | struct bio_vec *bvec; | |
1526 | int j; | |
1527 | ||
1528 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1529 | /* copy pages from the failed bio, as | |
1530 | * this might be a write-behind device */ | |
1531 | __bio_for_each_segment(bvec, bio, j, 0) | |
1532 | bvec->bv_page = bio_iovec_idx(r1_bio->bios[i], j)->bv_page; | |
1533 | bio_put(r1_bio->bios[i]); | |
1534 | bio->bi_sector = r1_bio->sector + | |
1535 | conf->mirrors[i].rdev->data_offset; | |
1536 | bio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1537 | bio->bi_end_io = raid1_end_write_request; | |
e3881a68 | 1538 | bio->bi_rw = WRITE | do_sync; |
a9701a30 N |
1539 | bio->bi_private = r1_bio; |
1540 | r1_bio->bios[i] = bio; | |
1541 | generic_make_request(bio); | |
1542 | } | |
1da177e4 LT |
1543 | } else { |
1544 | int disk; | |
ddaf22ab N |
1545 | |
1546 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1547 | * the block and we can fix it. | |
1548 | * We freeze all other IO, and try reading the block from | |
1549 | * other devices. When we find one, we re-write | |
1550 | * and check it that fixes the read error. | |
1551 | * This is all done synchronously while the array is | |
1552 | * frozen | |
1553 | */ | |
867868fb N |
1554 | if (mddev->ro == 0) { |
1555 | freeze_array(conf); | |
1556 | fix_read_error(conf, r1_bio->read_disk, | |
1557 | r1_bio->sector, | |
1558 | r1_bio->sectors); | |
1559 | unfreeze_array(conf); | |
ddaf22ab N |
1560 | } |
1561 | ||
1da177e4 LT |
1562 | bio = r1_bio->bios[r1_bio->read_disk]; |
1563 | if ((disk=read_balance(conf, r1_bio)) == -1) { | |
1564 | printk(KERN_ALERT "raid1: %s: unrecoverable I/O" | |
1565 | " read error for block %llu\n", | |
1566 | bdevname(bio->bi_bdev,b), | |
1567 | (unsigned long long)r1_bio->sector); | |
1568 | raid_end_bio_io(r1_bio); | |
1569 | } else { | |
e3881a68 | 1570 | const int do_sync = bio_sync(r1_bio->master_bio); |
cf30a473 N |
1571 | r1_bio->bios[r1_bio->read_disk] = |
1572 | mddev->ro ? IO_BLOCKED : NULL; | |
1da177e4 LT |
1573 | r1_bio->read_disk = disk; |
1574 | bio_put(bio); | |
1575 | bio = bio_clone(r1_bio->master_bio, GFP_NOIO); | |
1576 | r1_bio->bios[r1_bio->read_disk] = bio; | |
1577 | rdev = conf->mirrors[disk].rdev; | |
1578 | if (printk_ratelimit()) | |
1579 | printk(KERN_ERR "raid1: %s: redirecting sector %llu to" | |
1580 | " another mirror\n", | |
1581 | bdevname(rdev->bdev,b), | |
1582 | (unsigned long long)r1_bio->sector); | |
1583 | bio->bi_sector = r1_bio->sector + rdev->data_offset; | |
1584 | bio->bi_bdev = rdev->bdev; | |
1585 | bio->bi_end_io = raid1_end_read_request; | |
e3881a68 | 1586 | bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1587 | bio->bi_private = r1_bio; |
1588 | unplug = 1; | |
1589 | generic_make_request(bio); | |
1590 | } | |
1591 | } | |
1592 | } | |
1593 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1594 | if (unplug) | |
1595 | unplug_slaves(mddev); | |
1596 | } | |
1597 | ||
1598 | ||
1599 | static int init_resync(conf_t *conf) | |
1600 | { | |
1601 | int buffs; | |
1602 | ||
1603 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 1604 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
1605 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
1606 | conf->poolinfo); | |
1607 | if (!conf->r1buf_pool) | |
1608 | return -ENOMEM; | |
1609 | conf->next_resync = 0; | |
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * perform a "sync" on one "block" | |
1615 | * | |
1616 | * We need to make sure that no normal I/O request - particularly write | |
1617 | * requests - conflict with active sync requests. | |
1618 | * | |
1619 | * This is achieved by tracking pending requests and a 'barrier' concept | |
1620 | * that can be installed to exclude normal IO requests. | |
1621 | */ | |
1622 | ||
57afd89f | 1623 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 LT |
1624 | { |
1625 | conf_t *conf = mddev_to_conf(mddev); | |
1da177e4 LT |
1626 | r1bio_t *r1_bio; |
1627 | struct bio *bio; | |
1628 | sector_t max_sector, nr_sectors; | |
3e198f78 | 1629 | int disk = -1; |
1da177e4 | 1630 | int i; |
3e198f78 N |
1631 | int wonly = -1; |
1632 | int write_targets = 0, read_targets = 0; | |
191ea9b2 | 1633 | int sync_blocks; |
e3b9703e | 1634 | int still_degraded = 0; |
1da177e4 LT |
1635 | |
1636 | if (!conf->r1buf_pool) | |
191ea9b2 N |
1637 | { |
1638 | /* | |
1639 | printk("sync start - bitmap %p\n", mddev->bitmap); | |
1640 | */ | |
1da177e4 | 1641 | if (init_resync(conf)) |
57afd89f | 1642 | return 0; |
191ea9b2 | 1643 | } |
1da177e4 LT |
1644 | |
1645 | max_sector = mddev->size << 1; | |
1646 | if (sector_nr >= max_sector) { | |
191ea9b2 N |
1647 | /* If we aborted, we need to abort the |
1648 | * sync on the 'current' bitmap chunk (there will | |
1649 | * only be one in raid1 resync. | |
1650 | * We can find the current addess in mddev->curr_resync | |
1651 | */ | |
6a806c51 N |
1652 | if (mddev->curr_resync < max_sector) /* aborted */ |
1653 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 1654 | &sync_blocks, 1); |
6a806c51 | 1655 | else /* completed sync */ |
191ea9b2 | 1656 | conf->fullsync = 0; |
6a806c51 N |
1657 | |
1658 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
1659 | close_sync(conf); |
1660 | return 0; | |
1661 | } | |
1662 | ||
07d84d10 N |
1663 | if (mddev->bitmap == NULL && |
1664 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 1665 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
1666 | conf->fullsync == 0) { |
1667 | *skipped = 1; | |
1668 | return max_sector - sector_nr; | |
1669 | } | |
6394cca5 N |
1670 | /* before building a request, check if we can skip these blocks.. |
1671 | * This call the bitmap_start_sync doesn't actually record anything | |
1672 | */ | |
e3b9703e | 1673 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 1674 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
1675 | /* We can skip this block, and probably several more */ |
1676 | *skipped = 1; | |
1677 | return sync_blocks; | |
1678 | } | |
1da177e4 | 1679 | /* |
17999be4 N |
1680 | * If there is non-resync activity waiting for a turn, |
1681 | * and resync is going fast enough, | |
1682 | * then let it though before starting on this new sync request. | |
1da177e4 | 1683 | */ |
17999be4 | 1684 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 1685 | msleep_interruptible(1000); |
17999be4 | 1686 | |
b47490c9 | 1687 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
17999be4 N |
1688 | raise_barrier(conf); |
1689 | ||
1690 | conf->next_resync = sector_nr; | |
1da177e4 | 1691 | |
3e198f78 N |
1692 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
1693 | rcu_read_lock(); | |
1da177e4 | 1694 | /* |
3e198f78 N |
1695 | * If we get a correctably read error during resync or recovery, |
1696 | * we might want to read from a different device. So we | |
1697 | * flag all drives that could conceivably be read from for READ, | |
1698 | * and any others (which will be non-In_sync devices) for WRITE. | |
1699 | * If a read fails, we try reading from something else for which READ | |
1700 | * is OK. | |
1da177e4 | 1701 | */ |
1da177e4 | 1702 | |
1da177e4 LT |
1703 | r1_bio->mddev = mddev; |
1704 | r1_bio->sector = sector_nr; | |
191ea9b2 | 1705 | r1_bio->state = 0; |
1da177e4 | 1706 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
1707 | |
1708 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 1709 | mdk_rdev_t *rdev; |
1da177e4 LT |
1710 | bio = r1_bio->bios[i]; |
1711 | ||
1712 | /* take from bio_init */ | |
1713 | bio->bi_next = NULL; | |
1714 | bio->bi_flags |= 1 << BIO_UPTODATE; | |
802ba064 | 1715 | bio->bi_rw = READ; |
1da177e4 LT |
1716 | bio->bi_vcnt = 0; |
1717 | bio->bi_idx = 0; | |
1718 | bio->bi_phys_segments = 0; | |
1719 | bio->bi_hw_segments = 0; | |
1720 | bio->bi_size = 0; | |
1721 | bio->bi_end_io = NULL; | |
1722 | bio->bi_private = NULL; | |
1723 | ||
3e198f78 N |
1724 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
1725 | if (rdev == NULL || | |
1726 | test_bit(Faulty, &rdev->flags)) { | |
e3b9703e N |
1727 | still_degraded = 1; |
1728 | continue; | |
3e198f78 | 1729 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
1730 | bio->bi_rw = WRITE; |
1731 | bio->bi_end_io = end_sync_write; | |
1732 | write_targets ++; | |
3e198f78 N |
1733 | } else { |
1734 | /* may need to read from here */ | |
1735 | bio->bi_rw = READ; | |
1736 | bio->bi_end_io = end_sync_read; | |
1737 | if (test_bit(WriteMostly, &rdev->flags)) { | |
1738 | if (wonly < 0) | |
1739 | wonly = i; | |
1740 | } else { | |
1741 | if (disk < 0) | |
1742 | disk = i; | |
1743 | } | |
1744 | read_targets++; | |
1745 | } | |
1746 | atomic_inc(&rdev->nr_pending); | |
1747 | bio->bi_sector = sector_nr + rdev->data_offset; | |
1748 | bio->bi_bdev = rdev->bdev; | |
1da177e4 LT |
1749 | bio->bi_private = r1_bio; |
1750 | } | |
3e198f78 N |
1751 | rcu_read_unlock(); |
1752 | if (disk < 0) | |
1753 | disk = wonly; | |
1754 | r1_bio->read_disk = disk; | |
191ea9b2 | 1755 | |
3e198f78 N |
1756 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
1757 | /* extra read targets are also write targets */ | |
1758 | write_targets += read_targets-1; | |
1759 | ||
1760 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
1761 | /* There is nowhere to write, so all non-sync |
1762 | * drives must be failed - so we are finished | |
1763 | */ | |
57afd89f N |
1764 | sector_t rv = max_sector - sector_nr; |
1765 | *skipped = 1; | |
1da177e4 | 1766 | put_buf(r1_bio); |
1da177e4 LT |
1767 | return rv; |
1768 | } | |
1769 | ||
c6207277 N |
1770 | if (max_sector > mddev->resync_max) |
1771 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
1da177e4 | 1772 | nr_sectors = 0; |
289e99e8 | 1773 | sync_blocks = 0; |
1da177e4 LT |
1774 | do { |
1775 | struct page *page; | |
1776 | int len = PAGE_SIZE; | |
1777 | if (sector_nr + (len>>9) > max_sector) | |
1778 | len = (max_sector - sector_nr) << 9; | |
1779 | if (len == 0) | |
1780 | break; | |
6a806c51 N |
1781 | if (sync_blocks == 0) { |
1782 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
1783 | &sync_blocks, still_degraded) && |
1784 | !conf->fullsync && | |
1785 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 1786 | break; |
9e77c485 | 1787 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
6a806c51 N |
1788 | if (len > (sync_blocks<<9)) |
1789 | len = sync_blocks<<9; | |
ab7a30c7 | 1790 | } |
191ea9b2 | 1791 | |
1da177e4 LT |
1792 | for (i=0 ; i < conf->raid_disks; i++) { |
1793 | bio = r1_bio->bios[i]; | |
1794 | if (bio->bi_end_io) { | |
d11c171e | 1795 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
1796 | if (bio_add_page(bio, page, len, 0) == 0) { |
1797 | /* stop here */ | |
d11c171e | 1798 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
1799 | while (i > 0) { |
1800 | i--; | |
1801 | bio = r1_bio->bios[i]; | |
6a806c51 N |
1802 | if (bio->bi_end_io==NULL) |
1803 | continue; | |
1da177e4 LT |
1804 | /* remove last page from this bio */ |
1805 | bio->bi_vcnt--; | |
1806 | bio->bi_size -= len; | |
1807 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1808 | } | |
1809 | goto bio_full; | |
1810 | } | |
1811 | } | |
1812 | } | |
1813 | nr_sectors += len>>9; | |
1814 | sector_nr += len>>9; | |
191ea9b2 | 1815 | sync_blocks -= (len>>9); |
1da177e4 LT |
1816 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1817 | bio_full: | |
1da177e4 LT |
1818 | r1_bio->sectors = nr_sectors; |
1819 | ||
d11c171e N |
1820 | /* For a user-requested sync, we read all readable devices and do a |
1821 | * compare | |
1822 | */ | |
1823 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1824 | atomic_set(&r1_bio->remaining, read_targets); | |
1825 | for (i=0; i<conf->raid_disks; i++) { | |
1826 | bio = r1_bio->bios[i]; | |
1827 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 1828 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
1829 | generic_make_request(bio); |
1830 | } | |
1831 | } | |
1832 | } else { | |
1833 | atomic_set(&r1_bio->remaining, 1); | |
1834 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 1835 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 1836 | generic_make_request(bio); |
1da177e4 | 1837 | |
d11c171e | 1838 | } |
1da177e4 LT |
1839 | return nr_sectors; |
1840 | } | |
1841 | ||
1842 | static int run(mddev_t *mddev) | |
1843 | { | |
1844 | conf_t *conf; | |
1845 | int i, j, disk_idx; | |
1846 | mirror_info_t *disk; | |
1847 | mdk_rdev_t *rdev; | |
1848 | struct list_head *tmp; | |
1849 | ||
1850 | if (mddev->level != 1) { | |
1851 | printk("raid1: %s: raid level not set to mirroring (%d)\n", | |
1852 | mdname(mddev), mddev->level); | |
1853 | goto out; | |
1854 | } | |
f6705578 N |
1855 | if (mddev->reshape_position != MaxSector) { |
1856 | printk("raid1: %s: reshape_position set but not supported\n", | |
1857 | mdname(mddev)); | |
1858 | goto out; | |
1859 | } | |
1da177e4 LT |
1860 | /* |
1861 | * copy the already verified devices into our private RAID1 | |
1862 | * bookkeeping area. [whatever we allocate in run(), | |
1863 | * should be freed in stop()] | |
1864 | */ | |
9ffae0cf | 1865 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 LT |
1866 | mddev->private = conf; |
1867 | if (!conf) | |
1868 | goto out_no_mem; | |
1869 | ||
9ffae0cf | 1870 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
1871 | GFP_KERNEL); |
1872 | if (!conf->mirrors) | |
1873 | goto out_no_mem; | |
1874 | ||
ddaf22ab N |
1875 | conf->tmppage = alloc_page(GFP_KERNEL); |
1876 | if (!conf->tmppage) | |
1877 | goto out_no_mem; | |
1878 | ||
1da177e4 LT |
1879 | conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1880 | if (!conf->poolinfo) | |
1881 | goto out_no_mem; | |
1882 | conf->poolinfo->mddev = mddev; | |
1883 | conf->poolinfo->raid_disks = mddev->raid_disks; | |
1884 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
1885 | r1bio_pool_free, | |
1886 | conf->poolinfo); | |
1887 | if (!conf->r1bio_pool) | |
1888 | goto out_no_mem; | |
1889 | ||
d089c6af | 1890 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1891 | disk_idx = rdev->raid_disk; |
1892 | if (disk_idx >= mddev->raid_disks | |
1893 | || disk_idx < 0) | |
1894 | continue; | |
1895 | disk = conf->mirrors + disk_idx; | |
1896 | ||
1897 | disk->rdev = rdev; | |
1898 | ||
1899 | blk_queue_stack_limits(mddev->queue, | |
1900 | rdev->bdev->bd_disk->queue); | |
1901 | /* as we don't honour merge_bvec_fn, we must never risk | |
1902 | * violating it, so limit ->max_sector to one PAGE, as | |
1903 | * a one page request is never in violation. | |
1904 | */ | |
1905 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn && | |
1906 | mddev->queue->max_sectors > (PAGE_SIZE>>9)) | |
1907 | blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); | |
1908 | ||
1909 | disk->head_position = 0; | |
1da177e4 LT |
1910 | } |
1911 | conf->raid_disks = mddev->raid_disks; | |
1912 | conf->mddev = mddev; | |
1913 | spin_lock_init(&conf->device_lock); | |
1914 | INIT_LIST_HEAD(&conf->retry_list); | |
1da177e4 LT |
1915 | |
1916 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 1917 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 1918 | |
191ea9b2 N |
1919 | bio_list_init(&conf->pending_bio_list); |
1920 | bio_list_init(&conf->flushing_bio_list); | |
1921 | ||
1da177e4 LT |
1922 | |
1923 | mddev->degraded = 0; | |
1924 | for (i = 0; i < conf->raid_disks; i++) { | |
1925 | ||
1926 | disk = conf->mirrors + i; | |
1927 | ||
5fd6c1dc N |
1928 | if (!disk->rdev || |
1929 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 LT |
1930 | disk->head_position = 0; |
1931 | mddev->degraded++; | |
918f0238 N |
1932 | if (disk->rdev) |
1933 | conf->fullsync = 1; | |
1da177e4 LT |
1934 | } |
1935 | } | |
11ce99e6 N |
1936 | if (mddev->degraded == conf->raid_disks) { |
1937 | printk(KERN_ERR "raid1: no operational mirrors for %s\n", | |
1938 | mdname(mddev)); | |
1939 | goto out_free_conf; | |
1940 | } | |
1941 | if (conf->raid_disks - mddev->degraded == 1) | |
1942 | mddev->recovery_cp = MaxSector; | |
1da177e4 LT |
1943 | |
1944 | /* | |
1945 | * find the first working one and use it as a starting point | |
1946 | * to read balancing. | |
1947 | */ | |
1948 | for (j = 0; j < conf->raid_disks && | |
1949 | (!conf->mirrors[j].rdev || | |
b2d444d7 | 1950 | !test_bit(In_sync, &conf->mirrors[j].rdev->flags)) ; j++) |
1da177e4 LT |
1951 | /* nothing */; |
1952 | conf->last_used = j; | |
1953 | ||
1954 | ||
191ea9b2 N |
1955 | mddev->thread = md_register_thread(raid1d, mddev, "%s_raid1"); |
1956 | if (!mddev->thread) { | |
1957 | printk(KERN_ERR | |
1958 | "raid1: couldn't allocate thread for %s\n", | |
1959 | mdname(mddev)); | |
1960 | goto out_free_conf; | |
1da177e4 | 1961 | } |
191ea9b2 | 1962 | |
1da177e4 LT |
1963 | printk(KERN_INFO |
1964 | "raid1: raid set %s active with %d out of %d mirrors\n", | |
1965 | mdname(mddev), mddev->raid_disks - mddev->degraded, | |
1966 | mddev->raid_disks); | |
1967 | /* | |
1968 | * Ok, everything is just fine now | |
1969 | */ | |
1970 | mddev->array_size = mddev->size; | |
1971 | ||
7a5febe9 | 1972 | mddev->queue->unplug_fn = raid1_unplug; |
0d129228 N |
1973 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; |
1974 | mddev->queue->backing_dev_info.congested_data = mddev; | |
7a5febe9 | 1975 | |
1da177e4 LT |
1976 | return 0; |
1977 | ||
1978 | out_no_mem: | |
1979 | printk(KERN_ERR "raid1: couldn't allocate memory for %s\n", | |
1980 | mdname(mddev)); | |
1981 | ||
1982 | out_free_conf: | |
1983 | if (conf) { | |
1984 | if (conf->r1bio_pool) | |
1985 | mempool_destroy(conf->r1bio_pool); | |
990a8baf | 1986 | kfree(conf->mirrors); |
1345b1d8 | 1987 | safe_put_page(conf->tmppage); |
990a8baf | 1988 | kfree(conf->poolinfo); |
1da177e4 LT |
1989 | kfree(conf); |
1990 | mddev->private = NULL; | |
1991 | } | |
1992 | out: | |
1993 | return -EIO; | |
1994 | } | |
1995 | ||
1996 | static int stop(mddev_t *mddev) | |
1997 | { | |
1998 | conf_t *conf = mddev_to_conf(mddev); | |
4b6d287f N |
1999 | struct bitmap *bitmap = mddev->bitmap; |
2000 | int behind_wait = 0; | |
2001 | ||
2002 | /* wait for behind writes to complete */ | |
2003 | while (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
2004 | behind_wait++; | |
2005 | printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait); | |
2006 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2007 | schedule_timeout(HZ); /* wait a second */ | |
2008 | /* need to kick something here to make sure I/O goes? */ | |
2009 | } | |
1da177e4 LT |
2010 | |
2011 | md_unregister_thread(mddev->thread); | |
2012 | mddev->thread = NULL; | |
2013 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
2014 | if (conf->r1bio_pool) | |
2015 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2016 | kfree(conf->mirrors); |
2017 | kfree(conf->poolinfo); | |
1da177e4 LT |
2018 | kfree(conf); |
2019 | mddev->private = NULL; | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2024 | { | |
2025 | /* no resync is happening, and there is enough space | |
2026 | * on all devices, so we can resize. | |
2027 | * We need to make sure resync covers any new space. | |
2028 | * If the array is shrinking we should possibly wait until | |
2029 | * any io in the removed space completes, but it hardly seems | |
2030 | * worth it. | |
2031 | */ | |
2032 | mddev->array_size = sectors>>1; | |
2033 | set_capacity(mddev->gendisk, mddev->array_size << 1); | |
44ce6294 | 2034 | mddev->changed = 1; |
1da177e4 LT |
2035 | if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) { |
2036 | mddev->recovery_cp = mddev->size << 1; | |
2037 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2038 | } | |
2039 | mddev->size = mddev->array_size; | |
4b5c7ae8 | 2040 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2041 | return 0; |
2042 | } | |
2043 | ||
63c70c4f | 2044 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2045 | { |
2046 | /* We need to: | |
2047 | * 1/ resize the r1bio_pool | |
2048 | * 2/ resize conf->mirrors | |
2049 | * | |
2050 | * We allocate a new r1bio_pool if we can. | |
2051 | * Then raise a device barrier and wait until all IO stops. | |
2052 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2053 | * |
2054 | * At the same time, we "pack" the devices so that all the missing | |
2055 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2056 | */ |
2057 | mempool_t *newpool, *oldpool; | |
2058 | struct pool_info *newpoolinfo; | |
2059 | mirror_info_t *newmirrors; | |
2060 | conf_t *conf = mddev_to_conf(mddev); | |
63c70c4f | 2061 | int cnt, raid_disks; |
c04be0aa | 2062 | unsigned long flags; |
6ea9c07c | 2063 | int d, d2; |
1da177e4 | 2064 | |
63c70c4f N |
2065 | /* Cannot change chunk_size, layout, or level */ |
2066 | if (mddev->chunk_size != mddev->new_chunk || | |
2067 | mddev->layout != mddev->new_layout || | |
2068 | mddev->level != mddev->new_level) { | |
2069 | mddev->new_chunk = mddev->chunk_size; | |
2070 | mddev->new_layout = mddev->layout; | |
2071 | mddev->new_level = mddev->level; | |
2072 | return -EINVAL; | |
2073 | } | |
2074 | ||
2a2275d6 N |
2075 | md_allow_write(mddev); |
2076 | ||
63c70c4f N |
2077 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2078 | ||
6ea9c07c N |
2079 | if (raid_disks < conf->raid_disks) { |
2080 | cnt=0; | |
2081 | for (d= 0; d < conf->raid_disks; d++) | |
2082 | if (conf->mirrors[d].rdev) | |
2083 | cnt++; | |
2084 | if (cnt > raid_disks) | |
1da177e4 | 2085 | return -EBUSY; |
6ea9c07c | 2086 | } |
1da177e4 LT |
2087 | |
2088 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2089 | if (!newpoolinfo) | |
2090 | return -ENOMEM; | |
2091 | newpoolinfo->mddev = mddev; | |
2092 | newpoolinfo->raid_disks = raid_disks; | |
2093 | ||
2094 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2095 | r1bio_pool_free, newpoolinfo); | |
2096 | if (!newpool) { | |
2097 | kfree(newpoolinfo); | |
2098 | return -ENOMEM; | |
2099 | } | |
9ffae0cf | 2100 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2101 | if (!newmirrors) { |
2102 | kfree(newpoolinfo); | |
2103 | mempool_destroy(newpool); | |
2104 | return -ENOMEM; | |
2105 | } | |
1da177e4 | 2106 | |
17999be4 | 2107 | raise_barrier(conf); |
1da177e4 LT |
2108 | |
2109 | /* ok, everything is stopped */ | |
2110 | oldpool = conf->r1bio_pool; | |
2111 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2112 | |
a88aa786 N |
2113 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2114 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2115 | if (rdev && rdev->raid_disk != d2) { | |
2116 | char nm[20]; | |
2117 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2118 | sysfs_remove_link(&mddev->kobj, nm); | |
2119 | rdev->raid_disk = d2; | |
2120 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2121 | sysfs_remove_link(&mddev->kobj, nm); | |
2122 | if (sysfs_create_link(&mddev->kobj, | |
2123 | &rdev->kobj, nm)) | |
2124 | printk(KERN_WARNING | |
2125 | "md/raid1: cannot register " | |
2126 | "%s for %s\n", | |
2127 | nm, mdname(mddev)); | |
6ea9c07c | 2128 | } |
a88aa786 N |
2129 | if (rdev) |
2130 | newmirrors[d2++].rdev = rdev; | |
2131 | } | |
1da177e4 LT |
2132 | kfree(conf->mirrors); |
2133 | conf->mirrors = newmirrors; | |
2134 | kfree(conf->poolinfo); | |
2135 | conf->poolinfo = newpoolinfo; | |
2136 | ||
c04be0aa | 2137 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2138 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2139 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2140 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2141 | mddev->delta_disks = 0; |
1da177e4 | 2142 | |
6ea9c07c | 2143 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2144 | lower_barrier(conf); |
1da177e4 LT |
2145 | |
2146 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2147 | md_wakeup_thread(mddev->thread); | |
2148 | ||
2149 | mempool_destroy(oldpool); | |
2150 | return 0; | |
2151 | } | |
2152 | ||
500af87a | 2153 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 N |
2154 | { |
2155 | conf_t *conf = mddev_to_conf(mddev); | |
2156 | ||
2157 | switch(state) { | |
9e6603da | 2158 | case 1: |
17999be4 | 2159 | raise_barrier(conf); |
36fa3063 | 2160 | break; |
9e6603da | 2161 | case 0: |
17999be4 | 2162 | lower_barrier(conf); |
36fa3063 N |
2163 | break; |
2164 | } | |
36fa3063 N |
2165 | } |
2166 | ||
1da177e4 | 2167 | |
2604b703 | 2168 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2169 | { |
2170 | .name = "raid1", | |
2604b703 | 2171 | .level = 1, |
1da177e4 LT |
2172 | .owner = THIS_MODULE, |
2173 | .make_request = make_request, | |
2174 | .run = run, | |
2175 | .stop = stop, | |
2176 | .status = status, | |
2177 | .error_handler = error, | |
2178 | .hot_add_disk = raid1_add_disk, | |
2179 | .hot_remove_disk= raid1_remove_disk, | |
2180 | .spare_active = raid1_spare_active, | |
2181 | .sync_request = sync_request, | |
2182 | .resize = raid1_resize, | |
63c70c4f | 2183 | .check_reshape = raid1_reshape, |
36fa3063 | 2184 | .quiesce = raid1_quiesce, |
1da177e4 LT |
2185 | }; |
2186 | ||
2187 | static int __init raid_init(void) | |
2188 | { | |
2604b703 | 2189 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2190 | } |
2191 | ||
2192 | static void raid_exit(void) | |
2193 | { | |
2604b703 | 2194 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2195 | } |
2196 | ||
2197 | module_init(raid_init); | |
2198 | module_exit(raid_exit); | |
2199 | MODULE_LICENSE("GPL"); | |
2200 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ | |
d9d166c2 | 2201 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2202 | MODULE_ALIAS("md-level-1"); |