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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
bff61975 | 37 | #include <linux/seq_file.h> |
43b2e5d8 | 38 | #include "md.h" |
ef740c37 CH |
39 | #include "raid1.h" |
40 | #include "bitmap.h" | |
191ea9b2 N |
41 | |
42 | #define DEBUG 0 | |
43 | #if DEBUG | |
44 | #define PRINTK(x...) printk(x) | |
45 | #else | |
46 | #define PRINTK(x...) | |
47 | #endif | |
1da177e4 LT |
48 | |
49 | /* | |
50 | * Number of guaranteed r1bios in case of extreme VM load: | |
51 | */ | |
52 | #define NR_RAID1_BIOS 256 | |
53 | ||
1da177e4 | 54 | |
17999be4 N |
55 | static void allow_barrier(conf_t *conf); |
56 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 57 | |
dd0fc66f | 58 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
59 | { |
60 | struct pool_info *pi = data; | |
1da177e4 LT |
61 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); |
62 | ||
63 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 64 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
65 | } |
66 | ||
67 | static void r1bio_pool_free(void *r1_bio, void *data) | |
68 | { | |
69 | kfree(r1_bio); | |
70 | } | |
71 | ||
72 | #define RESYNC_BLOCK_SIZE (64*1024) | |
73 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
74 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
75 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
76 | #define RESYNC_WINDOW (2048*1024) | |
77 | ||
dd0fc66f | 78 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
79 | { |
80 | struct pool_info *pi = data; | |
81 | struct page *page; | |
82 | r1bio_t *r1_bio; | |
83 | struct bio *bio; | |
84 | int i, j; | |
85 | ||
86 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 87 | if (!r1_bio) |
1da177e4 | 88 | return NULL; |
1da177e4 LT |
89 | |
90 | /* | |
91 | * Allocate bios : 1 for reading, n-1 for writing | |
92 | */ | |
93 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 94 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
95 | if (!bio) |
96 | goto out_free_bio; | |
97 | r1_bio->bios[j] = bio; | |
98 | } | |
99 | /* | |
100 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
101 | * the first bio. |
102 | * If this is a user-requested check/repair, allocate | |
103 | * RESYNC_PAGES for each bio. | |
1da177e4 | 104 | */ |
d11c171e N |
105 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
106 | j = pi->raid_disks; | |
107 | else | |
108 | j = 1; | |
109 | while(j--) { | |
110 | bio = r1_bio->bios[j]; | |
111 | for (i = 0; i < RESYNC_PAGES; i++) { | |
112 | page = alloc_page(gfp_flags); | |
113 | if (unlikely(!page)) | |
114 | goto out_free_pages; | |
115 | ||
116 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 117 | bio->bi_vcnt = i+1; |
d11c171e N |
118 | } |
119 | } | |
120 | /* If not user-requests, copy the page pointers to all bios */ | |
121 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
122 | for (i=0; i<RESYNC_PAGES ; i++) | |
123 | for (j=1; j<pi->raid_disks; j++) | |
124 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
125 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
126 | } |
127 | ||
128 | r1_bio->master_bio = NULL; | |
129 | ||
130 | return r1_bio; | |
131 | ||
132 | out_free_pages: | |
303a0e11 N |
133 | for (j=0 ; j < pi->raid_disks; j++) |
134 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
135 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 136 | j = -1; |
1da177e4 LT |
137 | out_free_bio: |
138 | while ( ++j < pi->raid_disks ) | |
139 | bio_put(r1_bio->bios[j]); | |
140 | r1bio_pool_free(r1_bio, data); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
145 | { | |
146 | struct pool_info *pi = data; | |
d11c171e | 147 | int i,j; |
1da177e4 | 148 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 149 | |
d11c171e N |
150 | for (i = 0; i < RESYNC_PAGES; i++) |
151 | for (j = pi->raid_disks; j-- ;) { | |
152 | if (j == 0 || | |
153 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
154 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 155 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 156 | } |
1da177e4 LT |
157 | for (i=0 ; i < pi->raid_disks; i++) |
158 | bio_put(r1bio->bios[i]); | |
159 | ||
160 | r1bio_pool_free(r1bio, data); | |
161 | } | |
162 | ||
163 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
164 | { | |
165 | int i; | |
166 | ||
167 | for (i = 0; i < conf->raid_disks; i++) { | |
168 | struct bio **bio = r1_bio->bios + i; | |
cf30a473 | 169 | if (*bio && *bio != IO_BLOCKED) |
1da177e4 LT |
170 | bio_put(*bio); |
171 | *bio = NULL; | |
172 | } | |
173 | } | |
174 | ||
858119e1 | 175 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 176 | { |
070ec55d | 177 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
178 | |
179 | /* | |
180 | * Wake up any possible resync thread that waits for the device | |
181 | * to go idle. | |
182 | */ | |
17999be4 | 183 | allow_barrier(conf); |
1da177e4 LT |
184 | |
185 | put_all_bios(conf, r1_bio); | |
186 | mempool_free(r1_bio, conf->r1bio_pool); | |
187 | } | |
188 | ||
858119e1 | 189 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 | 190 | { |
070ec55d | 191 | conf_t *conf = r1_bio->mddev->private; |
3e198f78 N |
192 | int i; |
193 | ||
194 | for (i=0; i<conf->raid_disks; i++) { | |
195 | struct bio *bio = r1_bio->bios[i]; | |
196 | if (bio->bi_end_io) | |
197 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
198 | } | |
1da177e4 LT |
199 | |
200 | mempool_free(r1_bio, conf->r1buf_pool); | |
201 | ||
17999be4 | 202 | lower_barrier(conf); |
1da177e4 LT |
203 | } |
204 | ||
205 | static void reschedule_retry(r1bio_t *r1_bio) | |
206 | { | |
207 | unsigned long flags; | |
208 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 209 | conf_t *conf = mddev->private; |
1da177e4 LT |
210 | |
211 | spin_lock_irqsave(&conf->device_lock, flags); | |
212 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 213 | conf->nr_queued ++; |
1da177e4 LT |
214 | spin_unlock_irqrestore(&conf->device_lock, flags); |
215 | ||
17999be4 | 216 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
217 | md_wakeup_thread(mddev->thread); |
218 | } | |
219 | ||
220 | /* | |
221 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
222 | * operation and are ready to return a success/failure code to the buffer | |
223 | * cache layer. | |
224 | */ | |
225 | static void raid_end_bio_io(r1bio_t *r1_bio) | |
226 | { | |
227 | struct bio *bio = r1_bio->master_bio; | |
228 | ||
4b6d287f N |
229 | /* if nobody has done the final endio yet, do it now */ |
230 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
231 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
232 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
233 | (unsigned long long) bio->bi_sector, | |
234 | (unsigned long long) bio->bi_sector + | |
235 | (bio->bi_size >> 9) - 1); | |
236 | ||
6712ecf8 | 237 | bio_endio(bio, |
4b6d287f N |
238 | test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); |
239 | } | |
1da177e4 LT |
240 | free_r1bio(r1_bio); |
241 | } | |
242 | ||
243 | /* | |
244 | * Update disk head position estimator based on IRQ completion info. | |
245 | */ | |
246 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
247 | { | |
070ec55d | 248 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
249 | |
250 | conf->mirrors[disk].head_position = | |
251 | r1_bio->sector + (r1_bio->sectors); | |
252 | } | |
253 | ||
6712ecf8 | 254 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
255 | { |
256 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 257 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 258 | int mirror; |
070ec55d | 259 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 260 | |
1da177e4 LT |
261 | mirror = r1_bio->read_disk; |
262 | /* | |
263 | * this branch is our 'one mirror IO has finished' event handler: | |
264 | */ | |
ddaf22ab N |
265 | update_head_pos(mirror, r1_bio); |
266 | ||
dd00a99e N |
267 | if (uptodate) |
268 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
269 | else { | |
270 | /* If all other devices have failed, we want to return | |
271 | * the error upwards rather than fail the last device. | |
272 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 273 | */ |
dd00a99e N |
274 | unsigned long flags; |
275 | spin_lock_irqsave(&conf->device_lock, flags); | |
276 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
277 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
278 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
279 | uptodate = 1; | |
280 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
281 | } | |
1da177e4 | 282 | |
dd00a99e | 283 | if (uptodate) |
1da177e4 | 284 | raid_end_bio_io(r1_bio); |
dd00a99e | 285 | else { |
1da177e4 LT |
286 | /* |
287 | * oops, read error: | |
288 | */ | |
289 | char b[BDEVNAME_SIZE]; | |
290 | if (printk_ratelimit()) | |
9dd1e2fa N |
291 | printk(KERN_ERR "md/raid1:%s: %s: rescheduling sector %llu\n", |
292 | mdname(conf->mddev), | |
1da177e4 LT |
293 | bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); |
294 | reschedule_retry(r1_bio); | |
295 | } | |
296 | ||
297 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
298 | } |
299 | ||
af6d7b76 | 300 | static void r1_bio_write_done(r1bio_t *r1_bio) |
4e78064f N |
301 | { |
302 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
303 | { | |
304 | /* it really is the end of this request */ | |
305 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
306 | /* free extra copy of the data pages */ | |
af6d7b76 | 307 | int i = r1_bio->behind_page_count; |
4e78064f | 308 | while (i--) |
af6d7b76 N |
309 | safe_put_page(r1_bio->behind_pages[i]); |
310 | kfree(r1_bio->behind_pages); | |
311 | r1_bio->behind_pages = NULL; | |
4e78064f N |
312 | } |
313 | /* clear the bitmap if all writes complete successfully */ | |
314 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
315 | r1_bio->sectors, | |
316 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
af6d7b76 | 317 | test_bit(R1BIO_BehindIO, &r1_bio->state)); |
4e78064f N |
318 | md_write_end(r1_bio->mddev); |
319 | raid_end_bio_io(r1_bio); | |
320 | } | |
321 | } | |
322 | ||
6712ecf8 | 323 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
324 | { |
325 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 326 | r1bio_t *r1_bio = bio->bi_private; |
a9701a30 | 327 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
070ec55d | 328 | conf_t *conf = r1_bio->mddev->private; |
04b857f7 | 329 | struct bio *to_put = NULL; |
1da177e4 | 330 | |
1da177e4 LT |
331 | |
332 | for (mirror = 0; mirror < conf->raid_disks; mirror++) | |
333 | if (r1_bio->bios[mirror] == bio) | |
334 | break; | |
335 | ||
e9c7469b TH |
336 | /* |
337 | * 'one mirror IO has finished' event handler: | |
338 | */ | |
339 | r1_bio->bios[mirror] = NULL; | |
340 | to_put = bio; | |
341 | if (!uptodate) { | |
342 | md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); | |
343 | /* an I/O failed, we can't clear the bitmap */ | |
344 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
345 | } else | |
1da177e4 | 346 | /* |
e9c7469b TH |
347 | * Set R1BIO_Uptodate in our master bio, so that we |
348 | * will return a good error code for to the higher | |
349 | * levels even if IO on some other mirrored buffer | |
350 | * fails. | |
351 | * | |
352 | * The 'master' represents the composite IO operation | |
353 | * to user-side. So if something waits for IO, then it | |
354 | * will wait for the 'master' bio. | |
1da177e4 | 355 | */ |
e9c7469b TH |
356 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
357 | ||
358 | update_head_pos(mirror, r1_bio); | |
359 | ||
360 | if (behind) { | |
361 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
362 | atomic_dec(&r1_bio->behind_remaining); | |
363 | ||
364 | /* | |
365 | * In behind mode, we ACK the master bio once the I/O | |
366 | * has safely reached all non-writemostly | |
367 | * disks. Setting the Returned bit ensures that this | |
368 | * gets done only once -- we don't ever want to return | |
369 | * -EIO here, instead we'll wait | |
370 | */ | |
371 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
372 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
373 | /* Maybe we can return now */ | |
374 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
375 | struct bio *mbio = r1_bio->master_bio; | |
376 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
377 | (unsigned long long) mbio->bi_sector, | |
378 | (unsigned long long) mbio->bi_sector + | |
379 | (mbio->bi_size >> 9) - 1); | |
380 | bio_endio(mbio, 0); | |
4b6d287f N |
381 | } |
382 | } | |
383 | } | |
e9c7469b TH |
384 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
385 | ||
1da177e4 | 386 | /* |
1da177e4 LT |
387 | * Let's see if all mirrored write operations have finished |
388 | * already. | |
389 | */ | |
af6d7b76 | 390 | r1_bio_write_done(r1_bio); |
c70810b3 | 391 | |
04b857f7 N |
392 | if (to_put) |
393 | bio_put(to_put); | |
1da177e4 LT |
394 | } |
395 | ||
396 | ||
397 | /* | |
398 | * This routine returns the disk from which the requested read should | |
399 | * be done. There is a per-array 'next expected sequential IO' sector | |
400 | * number - if this matches on the next IO then we use the last disk. | |
401 | * There is also a per-disk 'last know head position' sector that is | |
402 | * maintained from IRQ contexts, both the normal and the resync IO | |
403 | * completion handlers update this position correctly. If there is no | |
404 | * perfect sequential match then we pick the disk whose head is closest. | |
405 | * | |
406 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
407 | * because position is mirror, not device based. | |
408 | * | |
409 | * The rdev for the device selected will have nr_pending incremented. | |
410 | */ | |
411 | static int read_balance(conf_t *conf, r1bio_t *r1_bio) | |
412 | { | |
af3a2cd6 | 413 | const sector_t this_sector = r1_bio->sector; |
1da177e4 | 414 | const int sectors = r1_bio->sectors; |
f3ac8bf7 | 415 | int start_disk; |
76073054 | 416 | int best_disk; |
f3ac8bf7 | 417 | int i; |
76073054 | 418 | sector_t best_dist; |
8ddf9efe | 419 | mdk_rdev_t *rdev; |
f3ac8bf7 | 420 | int choose_first; |
1da177e4 LT |
421 | |
422 | rcu_read_lock(); | |
423 | /* | |
8ddf9efe | 424 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
425 | * device if no resync is going on, or below the resync window. |
426 | * We take the first readable disk when above the resync window. | |
427 | */ | |
428 | retry: | |
76073054 N |
429 | best_disk = -1; |
430 | best_dist = MaxSector; | |
1da177e4 LT |
431 | if (conf->mddev->recovery_cp < MaxSector && |
432 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
433 | choose_first = 1; |
434 | start_disk = 0; | |
435 | } else { | |
436 | choose_first = 0; | |
437 | start_disk = conf->last_used; | |
1da177e4 LT |
438 | } |
439 | ||
f3ac8bf7 | 440 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 441 | sector_t dist; |
f3ac8bf7 N |
442 | int disk = start_disk + i; |
443 | if (disk >= conf->raid_disks) | |
444 | disk -= conf->raid_disks; | |
445 | ||
446 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
447 | if (r1_bio->bios[disk] == IO_BLOCKED | |
448 | || rdev == NULL | |
76073054 | 449 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 450 | continue; |
76073054 N |
451 | if (!test_bit(In_sync, &rdev->flags) && |
452 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 453 | continue; |
76073054 N |
454 | if (test_bit(WriteMostly, &rdev->flags)) { |
455 | /* Don't balance among write-mostly, just | |
456 | * use the first as a last resort */ | |
457 | if (best_disk < 0) | |
458 | best_disk = disk; | |
459 | continue; | |
460 | } | |
461 | /* This is a reasonable device to use. It might | |
462 | * even be best. | |
463 | */ | |
464 | dist = abs(this_sector - conf->mirrors[disk].head_position); | |
465 | if (choose_first | |
466 | /* Don't change to another disk for sequential reads */ | |
467 | || conf->next_seq_sect == this_sector | |
468 | || dist == 0 | |
469 | /* If device is idle, use it */ | |
470 | || atomic_read(&rdev->nr_pending) == 0) { | |
471 | best_disk = disk; | |
1da177e4 LT |
472 | break; |
473 | } | |
76073054 N |
474 | if (dist < best_dist) { |
475 | best_dist = dist; | |
476 | best_disk = disk; | |
1da177e4 | 477 | } |
f3ac8bf7 | 478 | } |
1da177e4 | 479 | |
76073054 N |
480 | if (best_disk >= 0) { |
481 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
482 | if (!rdev) |
483 | goto retry; | |
484 | atomic_inc(&rdev->nr_pending); | |
76073054 | 485 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
486 | /* cannot risk returning a device that failed |
487 | * before we inc'ed nr_pending | |
488 | */ | |
03c902e1 | 489 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
490 | goto retry; |
491 | } | |
8ddf9efe | 492 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 493 | conf->last_used = best_disk; |
1da177e4 LT |
494 | } |
495 | rcu_read_unlock(); | |
496 | ||
76073054 | 497 | return best_disk; |
1da177e4 LT |
498 | } |
499 | ||
0d129228 N |
500 | static int raid1_congested(void *data, int bits) |
501 | { | |
502 | mddev_t *mddev = data; | |
070ec55d | 503 | conf_t *conf = mddev->private; |
0d129228 N |
504 | int i, ret = 0; |
505 | ||
3fa841d7 N |
506 | if (mddev_congested(mddev, bits)) |
507 | return 1; | |
508 | ||
0d129228 N |
509 | rcu_read_lock(); |
510 | for (i = 0; i < mddev->raid_disks; i++) { | |
511 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
512 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
165125e1 | 513 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 N |
514 | |
515 | /* Note the '|| 1' - when read_balance prefers | |
516 | * non-congested targets, it can be removed | |
517 | */ | |
91a9e99d | 518 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
519 | ret |= bdi_congested(&q->backing_dev_info, bits); |
520 | else | |
521 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
522 | } | |
523 | } | |
524 | rcu_read_unlock(); | |
525 | return ret; | |
526 | } | |
527 | ||
528 | ||
7eaceacc | 529 | static void flush_pending_writes(conf_t *conf) |
a35e63ef N |
530 | { |
531 | /* Any writes that have been queued but are awaiting | |
532 | * bitmap updates get flushed here. | |
a35e63ef | 533 | */ |
a35e63ef N |
534 | spin_lock_irq(&conf->device_lock); |
535 | ||
536 | if (conf->pending_bio_list.head) { | |
537 | struct bio *bio; | |
538 | bio = bio_list_get(&conf->pending_bio_list); | |
a35e63ef N |
539 | spin_unlock_irq(&conf->device_lock); |
540 | /* flush any pending bitmap writes to | |
541 | * disk before proceeding w/ I/O */ | |
542 | bitmap_unplug(conf->mddev->bitmap); | |
543 | ||
544 | while (bio) { /* submit pending writes */ | |
545 | struct bio *next = bio->bi_next; | |
546 | bio->bi_next = NULL; | |
547 | generic_make_request(bio); | |
548 | bio = next; | |
549 | } | |
a35e63ef N |
550 | } else |
551 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
552 | } |
553 | ||
17999be4 N |
554 | /* Barriers.... |
555 | * Sometimes we need to suspend IO while we do something else, | |
556 | * either some resync/recovery, or reconfigure the array. | |
557 | * To do this we raise a 'barrier'. | |
558 | * The 'barrier' is a counter that can be raised multiple times | |
559 | * to count how many activities are happening which preclude | |
560 | * normal IO. | |
561 | * We can only raise the barrier if there is no pending IO. | |
562 | * i.e. if nr_pending == 0. | |
563 | * We choose only to raise the barrier if no-one is waiting for the | |
564 | * barrier to go down. This means that as soon as an IO request | |
565 | * is ready, no other operations which require a barrier will start | |
566 | * until the IO request has had a chance. | |
567 | * | |
568 | * So: regular IO calls 'wait_barrier'. When that returns there | |
569 | * is no backgroup IO happening, It must arrange to call | |
570 | * allow_barrier when it has finished its IO. | |
571 | * backgroup IO calls must call raise_barrier. Once that returns | |
572 | * there is no normal IO happeing. It must arrange to call | |
573 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
574 | */ |
575 | #define RESYNC_DEPTH 32 | |
576 | ||
17999be4 | 577 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
578 | { |
579 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
580 | |
581 | /* Wait until no block IO is waiting */ | |
582 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 583 | conf->resync_lock, ); |
17999be4 N |
584 | |
585 | /* block any new IO from starting */ | |
586 | conf->barrier++; | |
587 | ||
046abeed | 588 | /* Now wait for all pending IO to complete */ |
17999be4 N |
589 | wait_event_lock_irq(conf->wait_barrier, |
590 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 591 | conf->resync_lock, ); |
17999be4 N |
592 | |
593 | spin_unlock_irq(&conf->resync_lock); | |
594 | } | |
595 | ||
596 | static void lower_barrier(conf_t *conf) | |
597 | { | |
598 | unsigned long flags; | |
709ae487 | 599 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
600 | spin_lock_irqsave(&conf->resync_lock, flags); |
601 | conf->barrier--; | |
602 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
603 | wake_up(&conf->wait_barrier); | |
604 | } | |
605 | ||
606 | static void wait_barrier(conf_t *conf) | |
607 | { | |
608 | spin_lock_irq(&conf->resync_lock); | |
609 | if (conf->barrier) { | |
610 | conf->nr_waiting++; | |
611 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
612 | conf->resync_lock, | |
c3b328ac | 613 | ); |
17999be4 | 614 | conf->nr_waiting--; |
1da177e4 | 615 | } |
17999be4 | 616 | conf->nr_pending++; |
1da177e4 LT |
617 | spin_unlock_irq(&conf->resync_lock); |
618 | } | |
619 | ||
17999be4 N |
620 | static void allow_barrier(conf_t *conf) |
621 | { | |
622 | unsigned long flags; | |
623 | spin_lock_irqsave(&conf->resync_lock, flags); | |
624 | conf->nr_pending--; | |
625 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
626 | wake_up(&conf->wait_barrier); | |
627 | } | |
628 | ||
ddaf22ab N |
629 | static void freeze_array(conf_t *conf) |
630 | { | |
631 | /* stop syncio and normal IO and wait for everything to | |
632 | * go quite. | |
633 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
634 | * wait until nr_pending match nr_queued+1 |
635 | * This is called in the context of one normal IO request | |
636 | * that has failed. Thus any sync request that might be pending | |
637 | * will be blocked by nr_pending, and we need to wait for | |
638 | * pending IO requests to complete or be queued for re-try. | |
639 | * Thus the number queued (nr_queued) plus this request (1) | |
640 | * must match the number of pending IOs (nr_pending) before | |
641 | * we continue. | |
ddaf22ab N |
642 | */ |
643 | spin_lock_irq(&conf->resync_lock); | |
644 | conf->barrier++; | |
645 | conf->nr_waiting++; | |
646 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 647 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 648 | conf->resync_lock, |
c3b328ac | 649 | flush_pending_writes(conf)); |
ddaf22ab N |
650 | spin_unlock_irq(&conf->resync_lock); |
651 | } | |
652 | static void unfreeze_array(conf_t *conf) | |
653 | { | |
654 | /* reverse the effect of the freeze */ | |
655 | spin_lock_irq(&conf->resync_lock); | |
656 | conf->barrier--; | |
657 | conf->nr_waiting--; | |
658 | wake_up(&conf->wait_barrier); | |
659 | spin_unlock_irq(&conf->resync_lock); | |
660 | } | |
661 | ||
17999be4 | 662 | |
4e78064f | 663 | /* duplicate the data pages for behind I/O |
4e78064f | 664 | */ |
af6d7b76 | 665 | static void alloc_behind_pages(struct bio *bio, r1bio_t *r1_bio) |
4b6d287f N |
666 | { |
667 | int i; | |
668 | struct bio_vec *bvec; | |
af6d7b76 | 669 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page*), |
4b6d287f N |
670 | GFP_NOIO); |
671 | if (unlikely(!pages)) | |
af6d7b76 | 672 | return; |
4b6d287f | 673 | |
4b6d287f | 674 | bio_for_each_segment(bvec, bio, i) { |
af6d7b76 N |
675 | pages[i] = alloc_page(GFP_NOIO); |
676 | if (unlikely(!pages[i])) | |
4b6d287f | 677 | goto do_sync_io; |
af6d7b76 | 678 | memcpy(kmap(pages[i]) + bvec->bv_offset, |
4b6d287f | 679 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); |
af6d7b76 | 680 | kunmap(pages[i]); |
4b6d287f N |
681 | kunmap(bvec->bv_page); |
682 | } | |
af6d7b76 N |
683 | r1_bio->behind_pages = pages; |
684 | r1_bio->behind_page_count = bio->bi_vcnt; | |
685 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
686 | return; | |
4b6d287f N |
687 | |
688 | do_sync_io: | |
af6d7b76 N |
689 | for (i = 0; i < bio->bi_vcnt; i++) |
690 | if (pages[i]) | |
691 | put_page(pages[i]); | |
4b6d287f N |
692 | kfree(pages); |
693 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); | |
4b6d287f N |
694 | } |
695 | ||
21a52c6d | 696 | static int make_request(mddev_t *mddev, struct bio * bio) |
1da177e4 | 697 | { |
070ec55d | 698 | conf_t *conf = mddev->private; |
1da177e4 LT |
699 | mirror_info_t *mirror; |
700 | r1bio_t *r1_bio; | |
701 | struct bio *read_bio; | |
191ea9b2 | 702 | int i, targets = 0, disks; |
84255d10 | 703 | struct bitmap *bitmap; |
191ea9b2 | 704 | unsigned long flags; |
a362357b | 705 | const int rw = bio_data_dir(bio); |
2c7d46ec | 706 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 707 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
6bfe0b49 | 708 | mdk_rdev_t *blocked_rdev; |
c3b328ac | 709 | int plugged; |
191ea9b2 | 710 | |
1da177e4 LT |
711 | /* |
712 | * Register the new request and wait if the reconstruction | |
713 | * thread has put up a bar for new requests. | |
714 | * Continue immediately if no resync is active currently. | |
715 | */ | |
62de608d | 716 | |
3d310eb7 N |
717 | md_write_start(mddev, bio); /* wait on superblock update early */ |
718 | ||
6eef4b21 N |
719 | if (bio_data_dir(bio) == WRITE && |
720 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
721 | bio->bi_sector < mddev->suspend_hi) { | |
722 | /* As the suspend_* range is controlled by | |
723 | * userspace, we want an interruptible | |
724 | * wait. | |
725 | */ | |
726 | DEFINE_WAIT(w); | |
727 | for (;;) { | |
728 | flush_signals(current); | |
729 | prepare_to_wait(&conf->wait_barrier, | |
730 | &w, TASK_INTERRUPTIBLE); | |
731 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
732 | bio->bi_sector >= mddev->suspend_hi) | |
733 | break; | |
734 | schedule(); | |
735 | } | |
736 | finish_wait(&conf->wait_barrier, &w); | |
737 | } | |
62de608d | 738 | |
17999be4 | 739 | wait_barrier(conf); |
1da177e4 | 740 | |
84255d10 N |
741 | bitmap = mddev->bitmap; |
742 | ||
1da177e4 LT |
743 | /* |
744 | * make_request() can abort the operation when READA is being | |
745 | * used and no empty request is available. | |
746 | * | |
747 | */ | |
748 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
749 | ||
750 | r1_bio->master_bio = bio; | |
751 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 752 | r1_bio->state = 0; |
1da177e4 LT |
753 | r1_bio->mddev = mddev; |
754 | r1_bio->sector = bio->bi_sector; | |
755 | ||
a362357b | 756 | if (rw == READ) { |
1da177e4 LT |
757 | /* |
758 | * read balancing logic: | |
759 | */ | |
760 | int rdisk = read_balance(conf, r1_bio); | |
761 | ||
762 | if (rdisk < 0) { | |
763 | /* couldn't find anywhere to read from */ | |
764 | raid_end_bio_io(r1_bio); | |
765 | return 0; | |
766 | } | |
767 | mirror = conf->mirrors + rdisk; | |
768 | ||
e555190d N |
769 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
770 | bitmap) { | |
771 | /* Reading from a write-mostly device must | |
772 | * take care not to over-take any writes | |
773 | * that are 'behind' | |
774 | */ | |
775 | wait_event(bitmap->behind_wait, | |
776 | atomic_read(&bitmap->behind_writes) == 0); | |
777 | } | |
1da177e4 LT |
778 | r1_bio->read_disk = rdisk; |
779 | ||
a167f663 | 780 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1da177e4 LT |
781 | |
782 | r1_bio->bios[rdisk] = read_bio; | |
783 | ||
784 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
785 | read_bio->bi_bdev = mirror->rdev->bdev; | |
786 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 787 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
788 | read_bio->bi_private = r1_bio; |
789 | ||
790 | generic_make_request(read_bio); | |
791 | return 0; | |
792 | } | |
793 | ||
794 | /* | |
795 | * WRITE: | |
796 | */ | |
797 | /* first select target devices under spinlock and | |
798 | * inc refcount on their rdev. Record them by setting | |
799 | * bios[x] to bio | |
800 | */ | |
c3b328ac N |
801 | plugged = mddev_check_plugged(mddev); |
802 | ||
1da177e4 | 803 | disks = conf->raid_disks; |
6bfe0b49 DW |
804 | retry_write: |
805 | blocked_rdev = NULL; | |
1da177e4 LT |
806 | rcu_read_lock(); |
807 | for (i = 0; i < disks; i++) { | |
6bfe0b49 DW |
808 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
809 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
810 | atomic_inc(&rdev->nr_pending); | |
811 | blocked_rdev = rdev; | |
812 | break; | |
813 | } | |
814 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
1da177e4 | 815 | atomic_inc(&rdev->nr_pending); |
b2d444d7 | 816 | if (test_bit(Faulty, &rdev->flags)) { |
03c902e1 | 817 | rdev_dec_pending(rdev, mddev); |
1da177e4 | 818 | r1_bio->bios[i] = NULL; |
964147d5 | 819 | } else { |
1da177e4 | 820 | r1_bio->bios[i] = bio; |
964147d5 N |
821 | targets++; |
822 | } | |
1da177e4 LT |
823 | } else |
824 | r1_bio->bios[i] = NULL; | |
825 | } | |
826 | rcu_read_unlock(); | |
827 | ||
6bfe0b49 DW |
828 | if (unlikely(blocked_rdev)) { |
829 | /* Wait for this device to become unblocked */ | |
830 | int j; | |
831 | ||
832 | for (j = 0; j < i; j++) | |
833 | if (r1_bio->bios[j]) | |
834 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
835 | ||
836 | allow_barrier(conf); | |
837 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
838 | wait_barrier(conf); | |
839 | goto retry_write; | |
840 | } | |
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 | ||
e555190d N |
850 | /* do behind I/O ? |
851 | * Not if there are too many, or cannot allocate memory, | |
852 | * or a reader on WriteMostly is waiting for behind writes | |
853 | * to flush */ | |
4b6d287f | 854 | if (bitmap && |
42a04b50 N |
855 | (atomic_read(&bitmap->behind_writes) |
856 | < mddev->bitmap_info.max_write_behind) && | |
af6d7b76 N |
857 | !waitqueue_active(&bitmap->behind_wait)) |
858 | alloc_behind_pages(bio, r1_bio); | |
4b6d287f | 859 | |
4e78064f | 860 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 861 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 862 | |
4e78064f N |
863 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
864 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1da177e4 LT |
865 | for (i = 0; i < disks; i++) { |
866 | struct bio *mbio; | |
867 | if (!r1_bio->bios[i]) | |
868 | continue; | |
869 | ||
a167f663 | 870 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1da177e4 LT |
871 | r1_bio->bios[i] = mbio; |
872 | ||
873 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; | |
874 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
875 | mbio->bi_end_io = raid1_end_write_request; | |
e9c7469b | 876 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; |
1da177e4 LT |
877 | mbio->bi_private = r1_bio; |
878 | ||
af6d7b76 | 879 | if (r1_bio->behind_pages) { |
4b6d287f N |
880 | struct bio_vec *bvec; |
881 | int j; | |
882 | ||
883 | /* Yes, I really want the '__' version so that | |
884 | * we clear any unused pointer in the io_vec, rather | |
885 | * than leave them unchanged. This is important | |
886 | * because when we come to free the pages, we won't | |
046abeed | 887 | * know the original bi_idx, so we just free |
4b6d287f N |
888 | * them all |
889 | */ | |
890 | __bio_for_each_segment(bvec, mbio, j, 0) | |
af6d7b76 | 891 | bvec->bv_page = r1_bio->behind_pages[j]; |
4b6d287f N |
892 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
893 | atomic_inc(&r1_bio->behind_remaining); | |
894 | } | |
895 | ||
1da177e4 | 896 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
897 | spin_lock_irqsave(&conf->device_lock, flags); |
898 | bio_list_add(&conf->pending_bio_list, mbio); | |
4e78064f | 899 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 900 | } |
af6d7b76 | 901 | r1_bio_write_done(r1_bio); |
1da177e4 | 902 | |
4e78064f | 903 | /* In case raid1d snuck in to freeze_array */ |
a35e63ef N |
904 | wake_up(&conf->wait_barrier); |
905 | ||
c3b328ac | 906 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 907 | md_wakeup_thread(mddev->thread); |
191ea9b2 | 908 | |
1da177e4 LT |
909 | return 0; |
910 | } | |
911 | ||
912 | static void status(struct seq_file *seq, mddev_t *mddev) | |
913 | { | |
070ec55d | 914 | conf_t *conf = mddev->private; |
1da177e4 LT |
915 | int i; |
916 | ||
917 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 918 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
919 | rcu_read_lock(); |
920 | for (i = 0; i < conf->raid_disks; i++) { | |
921 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 922 | seq_printf(seq, "%s", |
ddac7c7e N |
923 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
924 | } | |
925 | rcu_read_unlock(); | |
1da177e4 LT |
926 | seq_printf(seq, "]"); |
927 | } | |
928 | ||
929 | ||
930 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
931 | { | |
932 | char b[BDEVNAME_SIZE]; | |
070ec55d | 933 | conf_t *conf = mddev->private; |
1da177e4 LT |
934 | |
935 | /* | |
936 | * If it is not operational, then we have already marked it as dead | |
937 | * else if it is the last working disks, ignore the error, let the | |
938 | * next level up know. | |
939 | * else mark the drive as failed | |
940 | */ | |
b2d444d7 | 941 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 942 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
943 | /* |
944 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
945 | * normal single drive. |
946 | * However don't try a recovery from this drive as | |
947 | * it is very likely to fail. | |
1da177e4 | 948 | */ |
4044ba58 | 949 | mddev->recovery_disabled = 1; |
1da177e4 | 950 | return; |
4044ba58 | 951 | } |
c04be0aa N |
952 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
953 | unsigned long flags; | |
954 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 955 | mddev->degraded++; |
dd00a99e | 956 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 957 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
958 | /* |
959 | * if recovery is running, make sure it aborts. | |
960 | */ | |
dfc70645 | 961 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
962 | } else |
963 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 964 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
965 | printk(KERN_ALERT |
966 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
967 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
968 | mdname(mddev), bdevname(rdev->bdev, b), |
969 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
970 | } |
971 | ||
972 | static void print_conf(conf_t *conf) | |
973 | { | |
974 | int i; | |
1da177e4 | 975 | |
9dd1e2fa | 976 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 977 | if (!conf) { |
9dd1e2fa | 978 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
979 | return; |
980 | } | |
9dd1e2fa | 981 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
982 | conf->raid_disks); |
983 | ||
ddac7c7e | 984 | rcu_read_lock(); |
1da177e4 LT |
985 | for (i = 0; i < conf->raid_disks; i++) { |
986 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
987 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
988 | if (rdev) | |
9dd1e2fa | 989 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
990 | i, !test_bit(In_sync, &rdev->flags), |
991 | !test_bit(Faulty, &rdev->flags), | |
992 | bdevname(rdev->bdev,b)); | |
1da177e4 | 993 | } |
ddac7c7e | 994 | rcu_read_unlock(); |
1da177e4 LT |
995 | } |
996 | ||
997 | static void close_sync(conf_t *conf) | |
998 | { | |
17999be4 N |
999 | wait_barrier(conf); |
1000 | allow_barrier(conf); | |
1da177e4 LT |
1001 | |
1002 | mempool_destroy(conf->r1buf_pool); | |
1003 | conf->r1buf_pool = NULL; | |
1004 | } | |
1005 | ||
1006 | static int raid1_spare_active(mddev_t *mddev) | |
1007 | { | |
1008 | int i; | |
1009 | conf_t *conf = mddev->private; | |
6b965620 N |
1010 | int count = 0; |
1011 | unsigned long flags; | |
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 | 1022 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1023 | count++; |
e6ffbcb6 | 1024 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
1025 | } |
1026 | } | |
6b965620 N |
1027 | spin_lock_irqsave(&conf->device_lock, flags); |
1028 | mddev->degraded -= count; | |
1029 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1030 | |
1031 | print_conf(conf); | |
6b965620 | 1032 | return count; |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | ||
1036 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1037 | { | |
1038 | conf_t *conf = mddev->private; | |
199050ea | 1039 | int err = -EEXIST; |
41158c7e | 1040 | int mirror = 0; |
1da177e4 | 1041 | mirror_info_t *p; |
6c2fce2e NB |
1042 | int first = 0; |
1043 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1044 | |
6c2fce2e NB |
1045 | if (rdev->raid_disk >= 0) |
1046 | first = last = rdev->raid_disk; | |
1047 | ||
1048 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1049 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1050 | ||
8f6c2e4b MP |
1051 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1052 | rdev->data_offset << 9); | |
627a2d3c N |
1053 | /* as we don't honour merge_bvec_fn, we must |
1054 | * never risk violating it, so limit | |
1055 | * ->max_segments to one lying with a single | |
1056 | * page, as a one page request is never in | |
1057 | * violation. | |
1da177e4 | 1058 | */ |
627a2d3c N |
1059 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1060 | blk_queue_max_segments(mddev->queue, 1); | |
1061 | blk_queue_segment_boundary(mddev->queue, | |
1062 | PAGE_CACHE_SIZE - 1); | |
1063 | } | |
1da177e4 LT |
1064 | |
1065 | p->head_position = 0; | |
1066 | rdev->raid_disk = mirror; | |
199050ea | 1067 | err = 0; |
6aea114a N |
1068 | /* As all devices are equivalent, we don't need a full recovery |
1069 | * if this was recently any drive of the array | |
1070 | */ | |
1071 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1072 | conf->fullsync = 1; |
d6065f7b | 1073 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1074 | break; |
1075 | } | |
ac5e7113 | 1076 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1077 | print_conf(conf); |
199050ea | 1078 | return err; |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1082 | { | |
1083 | conf_t *conf = mddev->private; | |
1084 | int err = 0; | |
1085 | mdk_rdev_t *rdev; | |
1086 | mirror_info_t *p = conf->mirrors+ number; | |
1087 | ||
1088 | print_conf(conf); | |
1089 | rdev = p->rdev; | |
1090 | if (rdev) { | |
b2d444d7 | 1091 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1092 | atomic_read(&rdev->nr_pending)) { |
1093 | err = -EBUSY; | |
1094 | goto abort; | |
1095 | } | |
046abeed | 1096 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1097 | * is not possible. |
1098 | */ | |
1099 | if (!test_bit(Faulty, &rdev->flags) && | |
8f9e0ee3 | 1100 | !mddev->recovery_disabled && |
dfc70645 N |
1101 | mddev->degraded < conf->raid_disks) { |
1102 | err = -EBUSY; | |
1103 | goto abort; | |
1104 | } | |
1da177e4 | 1105 | p->rdev = NULL; |
fbd568a3 | 1106 | synchronize_rcu(); |
1da177e4 LT |
1107 | if (atomic_read(&rdev->nr_pending)) { |
1108 | /* lost the race, try later */ | |
1109 | err = -EBUSY; | |
1110 | p->rdev = rdev; | |
ac5e7113 | 1111 | goto abort; |
1da177e4 | 1112 | } |
a91a2785 | 1113 | err = md_integrity_register(mddev); |
1da177e4 LT |
1114 | } |
1115 | abort: | |
1116 | ||
1117 | print_conf(conf); | |
1118 | return err; | |
1119 | } | |
1120 | ||
1121 | ||
6712ecf8 | 1122 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1123 | { |
7b92813c | 1124 | r1bio_t *r1_bio = bio->bi_private; |
d11c171e | 1125 | int i; |
1da177e4 | 1126 | |
d11c171e N |
1127 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1128 | if (r1_bio->bios[i] == bio) | |
1129 | break; | |
1130 | BUG_ON(i < 0); | |
1131 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1132 | /* |
1133 | * we have read a block, now it needs to be re-written, | |
1134 | * or re-read if the read failed. | |
1135 | * We don't do much here, just schedule handling by raid1d | |
1136 | */ | |
69382e85 | 1137 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1138 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1139 | |
1140 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1141 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1142 | } |
1143 | ||
6712ecf8 | 1144 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1145 | { |
1146 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 1147 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 1148 | mddev_t *mddev = r1_bio->mddev; |
070ec55d | 1149 | conf_t *conf = mddev->private; |
1da177e4 LT |
1150 | int i; |
1151 | int mirror=0; | |
1152 | ||
1da177e4 LT |
1153 | for (i = 0; i < conf->raid_disks; i++) |
1154 | if (r1_bio->bios[i] == bio) { | |
1155 | mirror = i; | |
1156 | break; | |
1157 | } | |
6b1117d5 | 1158 | if (!uptodate) { |
57dab0bd | 1159 | sector_t sync_blocks = 0; |
6b1117d5 N |
1160 | sector_t s = r1_bio->sector; |
1161 | long sectors_to_go = r1_bio->sectors; | |
1162 | /* make sure these bits doesn't get cleared. */ | |
1163 | do { | |
5e3db645 | 1164 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1165 | &sync_blocks, 1); |
1166 | s += sync_blocks; | |
1167 | sectors_to_go -= sync_blocks; | |
1168 | } while (sectors_to_go > 0); | |
1da177e4 | 1169 | md_error(mddev, conf->mirrors[mirror].rdev); |
6b1117d5 | 1170 | } |
e3b9703e | 1171 | |
1da177e4 LT |
1172 | update_head_pos(mirror, r1_bio); |
1173 | ||
1174 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
73d5c38a | 1175 | sector_t s = r1_bio->sectors; |
1da177e4 | 1176 | put_buf(r1_bio); |
73d5c38a | 1177 | md_done_sync(mddev, s, uptodate); |
1da177e4 | 1178 | } |
1da177e4 LT |
1179 | } |
1180 | ||
a68e5870 | 1181 | static int fix_sync_read_error(r1bio_t *r1_bio) |
1da177e4 | 1182 | { |
a68e5870 N |
1183 | /* Try some synchronous reads of other devices to get |
1184 | * good data, much like with normal read errors. Only | |
1185 | * read into the pages we already have so we don't | |
1186 | * need to re-issue the read request. | |
1187 | * We don't need to freeze the array, because being in an | |
1188 | * active sync request, there is no normal IO, and | |
1189 | * no overlapping syncs. | |
1190 | */ | |
1191 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 1192 | conf_t *conf = mddev->private; |
a68e5870 N |
1193 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1194 | sector_t sect = r1_bio->sector; | |
1195 | int sectors = r1_bio->sectors; | |
1196 | int idx = 0; | |
1197 | ||
1198 | while(sectors) { | |
1199 | int s = sectors; | |
1200 | int d = r1_bio->read_disk; | |
1201 | int success = 0; | |
1202 | mdk_rdev_t *rdev; | |
78d7f5f7 | 1203 | int start; |
a68e5870 N |
1204 | |
1205 | if (s > (PAGE_SIZE>>9)) | |
1206 | s = PAGE_SIZE >> 9; | |
1207 | do { | |
1208 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1209 | /* No rcu protection needed here devices | |
1210 | * can only be removed when no resync is | |
1211 | * active, and resync is currently active | |
1212 | */ | |
1213 | rdev = conf->mirrors[d].rdev; | |
1214 | if (sync_page_io(rdev, | |
1215 | sect, | |
1216 | s<<9, | |
1217 | bio->bi_io_vec[idx].bv_page, | |
1218 | READ, false)) { | |
1219 | success = 1; | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | d++; | |
1224 | if (d == conf->raid_disks) | |
1225 | d = 0; | |
1226 | } while (!success && d != r1_bio->read_disk); | |
1227 | ||
78d7f5f7 | 1228 | if (!success) { |
a68e5870 N |
1229 | char b[BDEVNAME_SIZE]; |
1230 | /* Cannot read from anywhere, array is toast */ | |
1231 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1232 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" | |
1233 | " for block %llu\n", | |
1234 | mdname(mddev), | |
1235 | bdevname(bio->bi_bdev, b), | |
1236 | (unsigned long long)r1_bio->sector); | |
1237 | md_done_sync(mddev, r1_bio->sectors, 0); | |
d11c171e | 1238 | put_buf(r1_bio); |
a68e5870 | 1239 | return 0; |
d11c171e | 1240 | } |
78d7f5f7 N |
1241 | |
1242 | start = d; | |
1243 | /* write it back and re-read */ | |
1244 | while (d != r1_bio->read_disk) { | |
1245 | if (d == 0) | |
1246 | d = conf->raid_disks; | |
1247 | d--; | |
1248 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1249 | continue; | |
1250 | rdev = conf->mirrors[d].rdev; | |
1251 | if (sync_page_io(rdev, | |
1252 | sect, | |
1253 | s<<9, | |
1254 | bio->bi_io_vec[idx].bv_page, | |
1255 | WRITE, false) == 0) { | |
1256 | r1_bio->bios[d]->bi_end_io = NULL; | |
1257 | rdev_dec_pending(rdev, mddev); | |
1258 | md_error(mddev, rdev); | |
1259 | } else | |
1260 | atomic_add(s, &rdev->corrected_errors); | |
1261 | } | |
1262 | d = start; | |
1263 | while (d != r1_bio->read_disk) { | |
1264 | if (d == 0) | |
1265 | d = conf->raid_disks; | |
1266 | d--; | |
1267 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1268 | continue; | |
1269 | rdev = conf->mirrors[d].rdev; | |
1270 | if (sync_page_io(rdev, | |
1271 | sect, | |
1272 | s<<9, | |
1273 | bio->bi_io_vec[idx].bv_page, | |
1274 | READ, false) == 0) | |
1275 | md_error(mddev, rdev); | |
1276 | } | |
a68e5870 N |
1277 | sectors -= s; |
1278 | sect += s; | |
1279 | idx ++; | |
1280 | } | |
78d7f5f7 | 1281 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1282 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1283 | return 1; |
1284 | } | |
1285 | ||
1286 | static int process_checks(r1bio_t *r1_bio) | |
1287 | { | |
1288 | /* We have read all readable devices. If we haven't | |
1289 | * got the block, then there is no hope left. | |
1290 | * If we have, then we want to do a comparison | |
1291 | * and skip the write if everything is the same. | |
1292 | * If any blocks failed to read, then we need to | |
1293 | * attempt an over-write | |
1294 | */ | |
1295 | mddev_t *mddev = r1_bio->mddev; | |
1296 | conf_t *conf = mddev->private; | |
1297 | int primary; | |
1298 | int i; | |
1299 | ||
78d7f5f7 | 1300 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1301 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1302 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1303 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1304 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1305 | break; | |
1306 | } | |
1307 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1308 | for (i = 0; i < conf->raid_disks; i++) { |
1309 | int j; | |
1310 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1311 | struct bio *pbio = r1_bio->bios[primary]; | |
1312 | struct bio *sbio = r1_bio->bios[i]; | |
1313 | int size; | |
a68e5870 | 1314 | |
78d7f5f7 N |
1315 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1316 | continue; | |
1317 | ||
1318 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1319 | for (j = vcnt; j-- ; ) { | |
1320 | struct page *p, *s; | |
1321 | p = pbio->bi_io_vec[j].bv_page; | |
1322 | s = sbio->bi_io_vec[j].bv_page; | |
1323 | if (memcmp(page_address(p), | |
1324 | page_address(s), | |
1325 | PAGE_SIZE)) | |
1326 | break; | |
69382e85 | 1327 | } |
78d7f5f7 N |
1328 | } else |
1329 | j = 0; | |
1330 | if (j >= 0) | |
1331 | mddev->resync_mismatches += r1_bio->sectors; | |
1332 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1333 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1334 | /* No need to write to this device. */ | |
1335 | sbio->bi_end_io = NULL; | |
1336 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1337 | continue; | |
1338 | } | |
1339 | /* fixup the bio for reuse */ | |
1340 | sbio->bi_vcnt = vcnt; | |
1341 | sbio->bi_size = r1_bio->sectors << 9; | |
1342 | sbio->bi_idx = 0; | |
1343 | sbio->bi_phys_segments = 0; | |
1344 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1345 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1346 | sbio->bi_next = NULL; | |
1347 | sbio->bi_sector = r1_bio->sector + | |
1348 | conf->mirrors[i].rdev->data_offset; | |
1349 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1350 | size = sbio->bi_size; | |
1351 | for (j = 0; j < vcnt ; j++) { | |
1352 | struct bio_vec *bi; | |
1353 | bi = &sbio->bi_io_vec[j]; | |
1354 | bi->bv_offset = 0; | |
1355 | if (size > PAGE_SIZE) | |
1356 | bi->bv_len = PAGE_SIZE; | |
1357 | else | |
1358 | bi->bv_len = size; | |
1359 | size -= PAGE_SIZE; | |
1360 | memcpy(page_address(bi->bv_page), | |
1361 | page_address(pbio->bi_io_vec[j].bv_page), | |
1362 | PAGE_SIZE); | |
69382e85 | 1363 | } |
78d7f5f7 | 1364 | } |
a68e5870 N |
1365 | return 0; |
1366 | } | |
1367 | ||
1368 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1369 | { | |
1370 | conf_t *conf = mddev->private; | |
1371 | int i; | |
1372 | int disks = conf->raid_disks; | |
1373 | struct bio *bio, *wbio; | |
1374 | ||
1375 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1376 | ||
a68e5870 N |
1377 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1378 | /* ouch - failed to read all of that. */ | |
1379 | if (!fix_sync_read_error(r1_bio)) | |
1380 | return; | |
7ca78d57 N |
1381 | |
1382 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1383 | if (process_checks(r1_bio) < 0) | |
1384 | return; | |
d11c171e N |
1385 | /* |
1386 | * schedule writes | |
1387 | */ | |
1da177e4 LT |
1388 | atomic_set(&r1_bio->remaining, 1); |
1389 | for (i = 0; i < disks ; i++) { | |
1390 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1391 | if (wbio->bi_end_io == NULL || |
1392 | (wbio->bi_end_io == end_sync_read && | |
1393 | (i == r1_bio->read_disk || | |
1394 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1395 | continue; |
1396 | ||
3e198f78 N |
1397 | wbio->bi_rw = WRITE; |
1398 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1399 | atomic_inc(&r1_bio->remaining); |
1400 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1401 | |
1da177e4 LT |
1402 | generic_make_request(wbio); |
1403 | } | |
1404 | ||
1405 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1406 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1407 | md_done_sync(mddev, r1_bio->sectors, 1); |
1408 | put_buf(r1_bio); | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * This is a kernel thread which: | |
1414 | * | |
1415 | * 1. Retries failed read operations on working mirrors. | |
1416 | * 2. Updates the raid superblock when problems encounter. | |
1417 | * 3. Performs writes following reads for array syncronising. | |
1418 | */ | |
1419 | ||
867868fb N |
1420 | static void fix_read_error(conf_t *conf, int read_disk, |
1421 | sector_t sect, int sectors) | |
1422 | { | |
1423 | mddev_t *mddev = conf->mddev; | |
1424 | while(sectors) { | |
1425 | int s = sectors; | |
1426 | int d = read_disk; | |
1427 | int success = 0; | |
1428 | int start; | |
1429 | mdk_rdev_t *rdev; | |
1430 | ||
1431 | if (s > (PAGE_SIZE>>9)) | |
1432 | s = PAGE_SIZE >> 9; | |
1433 | ||
1434 | do { | |
1435 | /* Note: no rcu protection needed here | |
1436 | * as this is synchronous in the raid1d thread | |
1437 | * which is the thread that might remove | |
1438 | * a device. If raid1d ever becomes multi-threaded.... | |
1439 | */ | |
1440 | rdev = conf->mirrors[d].rdev; | |
1441 | if (rdev && | |
1442 | test_bit(In_sync, &rdev->flags) && | |
ccebd4c4 JB |
1443 | sync_page_io(rdev, sect, s<<9, |
1444 | conf->tmppage, READ, false)) | |
867868fb N |
1445 | success = 1; |
1446 | else { | |
1447 | d++; | |
1448 | if (d == conf->raid_disks) | |
1449 | d = 0; | |
1450 | } | |
1451 | } while (!success && d != read_disk); | |
1452 | ||
1453 | if (!success) { | |
1454 | /* Cannot read from anywhere -- bye bye array */ | |
1455 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1456 | break; | |
1457 | } | |
1458 | /* write it back and re-read */ | |
1459 | start = d; | |
1460 | while (d != read_disk) { | |
1461 | if (d==0) | |
1462 | d = conf->raid_disks; | |
1463 | d--; | |
1464 | rdev = conf->mirrors[d].rdev; | |
1465 | if (rdev && | |
1466 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1467 | if (sync_page_io(rdev, sect, s<<9, |
1468 | conf->tmppage, WRITE, false) | |
867868fb N |
1469 | == 0) |
1470 | /* Well, this device is dead */ | |
1471 | md_error(mddev, rdev); | |
1472 | } | |
1473 | } | |
1474 | d = start; | |
1475 | while (d != read_disk) { | |
1476 | char b[BDEVNAME_SIZE]; | |
1477 | if (d==0) | |
1478 | d = conf->raid_disks; | |
1479 | d--; | |
1480 | rdev = conf->mirrors[d].rdev; | |
1481 | if (rdev && | |
1482 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1483 | if (sync_page_io(rdev, sect, s<<9, |
1484 | conf->tmppage, READ, false) | |
867868fb N |
1485 | == 0) |
1486 | /* Well, this device is dead */ | |
1487 | md_error(mddev, rdev); | |
1488 | else { | |
1489 | atomic_add(s, &rdev->corrected_errors); | |
1490 | printk(KERN_INFO | |
9dd1e2fa | 1491 | "md/raid1:%s: read error corrected " |
867868fb N |
1492 | "(%d sectors at %llu on %s)\n", |
1493 | mdname(mddev), s, | |
969b755a RD |
1494 | (unsigned long long)(sect + |
1495 | rdev->data_offset), | |
867868fb N |
1496 | bdevname(rdev->bdev, b)); |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | sectors -= s; | |
1501 | sect += s; | |
1502 | } | |
1503 | } | |
1504 | ||
1da177e4 LT |
1505 | static void raid1d(mddev_t *mddev) |
1506 | { | |
1507 | r1bio_t *r1_bio; | |
1508 | struct bio *bio; | |
1509 | unsigned long flags; | |
070ec55d | 1510 | conf_t *conf = mddev->private; |
1da177e4 | 1511 | struct list_head *head = &conf->retry_list; |
1da177e4 | 1512 | mdk_rdev_t *rdev; |
e1dfa0a2 | 1513 | struct blk_plug plug; |
1da177e4 LT |
1514 | |
1515 | md_check_recovery(mddev); | |
e1dfa0a2 N |
1516 | |
1517 | blk_start_plug(&plug); | |
1da177e4 LT |
1518 | for (;;) { |
1519 | char b[BDEVNAME_SIZE]; | |
191ea9b2 | 1520 | |
c3b328ac N |
1521 | if (atomic_read(&mddev->plug_cnt) == 0) |
1522 | flush_pending_writes(conf); | |
191ea9b2 | 1523 | |
a35e63ef N |
1524 | spin_lock_irqsave(&conf->device_lock, flags); |
1525 | if (list_empty(head)) { | |
1526 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 1527 | break; |
a35e63ef | 1528 | } |
1da177e4 LT |
1529 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
1530 | list_del(head->prev); | |
ddaf22ab | 1531 | conf->nr_queued--; |
1da177e4 LT |
1532 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1533 | ||
1534 | mddev = r1_bio->mddev; | |
070ec55d | 1535 | conf = mddev->private; |
7eaceacc | 1536 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) |
1da177e4 | 1537 | sync_request_write(mddev, r1_bio); |
7eaceacc | 1538 | else { |
1da177e4 | 1539 | int disk; |
ddaf22ab N |
1540 | |
1541 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1542 | * the block and we can fix it. | |
1543 | * We freeze all other IO, and try reading the block from | |
1544 | * other devices. When we find one, we re-write | |
1545 | * and check it that fixes the read error. | |
1546 | * This is all done synchronously while the array is | |
1547 | * frozen | |
1548 | */ | |
867868fb N |
1549 | if (mddev->ro == 0) { |
1550 | freeze_array(conf); | |
1551 | fix_read_error(conf, r1_bio->read_disk, | |
1552 | r1_bio->sector, | |
1553 | r1_bio->sectors); | |
1554 | unfreeze_array(conf); | |
d0e26078 N |
1555 | } else |
1556 | md_error(mddev, | |
1557 | conf->mirrors[r1_bio->read_disk].rdev); | |
ddaf22ab | 1558 | |
1da177e4 | 1559 | bio = r1_bio->bios[r1_bio->read_disk]; |
d0e26078 | 1560 | if ((disk=read_balance(conf, r1_bio)) == -1) { |
9dd1e2fa | 1561 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" |
1da177e4 | 1562 | " read error for block %llu\n", |
9dd1e2fa | 1563 | mdname(mddev), |
1da177e4 LT |
1564 | bdevname(bio->bi_bdev,b), |
1565 | (unsigned long long)r1_bio->sector); | |
1566 | raid_end_bio_io(r1_bio); | |
1567 | } else { | |
2c7d46ec | 1568 | const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC; |
cf30a473 N |
1569 | r1_bio->bios[r1_bio->read_disk] = |
1570 | mddev->ro ? IO_BLOCKED : NULL; | |
1da177e4 LT |
1571 | r1_bio->read_disk = disk; |
1572 | bio_put(bio); | |
a167f663 N |
1573 | bio = bio_clone_mddev(r1_bio->master_bio, |
1574 | GFP_NOIO, mddev); | |
1da177e4 LT |
1575 | r1_bio->bios[r1_bio->read_disk] = bio; |
1576 | rdev = conf->mirrors[disk].rdev; | |
1577 | if (printk_ratelimit()) | |
9dd1e2fa | 1578 | printk(KERN_ERR "md/raid1:%s: redirecting sector %llu to" |
d754c5ae | 1579 | " other mirror: %s\n", |
9dd1e2fa | 1580 | mdname(mddev), |
d754c5ae N |
1581 | (unsigned long long)r1_bio->sector, |
1582 | bdevname(rdev->bdev,b)); | |
1da177e4 LT |
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; | |
7b6d91da | 1586 | bio->bi_rw = READ | do_sync; |
1da177e4 | 1587 | bio->bi_private = r1_bio; |
1da177e4 LT |
1588 | generic_make_request(bio); |
1589 | } | |
1590 | } | |
1d9d5241 | 1591 | cond_resched(); |
1da177e4 | 1592 | } |
e1dfa0a2 | 1593 | blk_finish_plug(&plug); |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | ||
1597 | static int init_resync(conf_t *conf) | |
1598 | { | |
1599 | int buffs; | |
1600 | ||
1601 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 1602 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
1603 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
1604 | conf->poolinfo); | |
1605 | if (!conf->r1buf_pool) | |
1606 | return -ENOMEM; | |
1607 | conf->next_resync = 0; | |
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * perform a "sync" on one "block" | |
1613 | * | |
1614 | * We need to make sure that no normal I/O request - particularly write | |
1615 | * requests - conflict with active sync requests. | |
1616 | * | |
1617 | * This is achieved by tracking pending requests and a 'barrier' concept | |
1618 | * that can be installed to exclude normal IO requests. | |
1619 | */ | |
1620 | ||
57afd89f | 1621 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 1622 | { |
070ec55d | 1623 | conf_t *conf = mddev->private; |
1da177e4 LT |
1624 | r1bio_t *r1_bio; |
1625 | struct bio *bio; | |
1626 | sector_t max_sector, nr_sectors; | |
3e198f78 | 1627 | int disk = -1; |
1da177e4 | 1628 | int i; |
3e198f78 N |
1629 | int wonly = -1; |
1630 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 1631 | sector_t sync_blocks; |
e3b9703e | 1632 | int still_degraded = 0; |
1da177e4 LT |
1633 | |
1634 | if (!conf->r1buf_pool) | |
1635 | if (init_resync(conf)) | |
57afd89f | 1636 | return 0; |
1da177e4 | 1637 | |
58c0fed4 | 1638 | max_sector = mddev->dev_sectors; |
1da177e4 | 1639 | if (sector_nr >= max_sector) { |
191ea9b2 N |
1640 | /* If we aborted, we need to abort the |
1641 | * sync on the 'current' bitmap chunk (there will | |
1642 | * only be one in raid1 resync. | |
1643 | * We can find the current addess in mddev->curr_resync | |
1644 | */ | |
6a806c51 N |
1645 | if (mddev->curr_resync < max_sector) /* aborted */ |
1646 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 1647 | &sync_blocks, 1); |
6a806c51 | 1648 | else /* completed sync */ |
191ea9b2 | 1649 | conf->fullsync = 0; |
6a806c51 N |
1650 | |
1651 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
1652 | close_sync(conf); |
1653 | return 0; | |
1654 | } | |
1655 | ||
07d84d10 N |
1656 | if (mddev->bitmap == NULL && |
1657 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 1658 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
1659 | conf->fullsync == 0) { |
1660 | *skipped = 1; | |
1661 | return max_sector - sector_nr; | |
1662 | } | |
6394cca5 N |
1663 | /* before building a request, check if we can skip these blocks.. |
1664 | * This call the bitmap_start_sync doesn't actually record anything | |
1665 | */ | |
e3b9703e | 1666 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 1667 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
1668 | /* We can skip this block, and probably several more */ |
1669 | *skipped = 1; | |
1670 | return sync_blocks; | |
1671 | } | |
1da177e4 | 1672 | /* |
17999be4 N |
1673 | * If there is non-resync activity waiting for a turn, |
1674 | * and resync is going fast enough, | |
1675 | * then let it though before starting on this new sync request. | |
1da177e4 | 1676 | */ |
17999be4 | 1677 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 1678 | msleep_interruptible(1000); |
17999be4 | 1679 | |
b47490c9 | 1680 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 1681 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
1682 | raise_barrier(conf); |
1683 | ||
1684 | conf->next_resync = sector_nr; | |
1da177e4 | 1685 | |
3e198f78 | 1686 | rcu_read_lock(); |
1da177e4 | 1687 | /* |
3e198f78 N |
1688 | * If we get a correctably read error during resync or recovery, |
1689 | * we might want to read from a different device. So we | |
1690 | * flag all drives that could conceivably be read from for READ, | |
1691 | * and any others (which will be non-In_sync devices) for WRITE. | |
1692 | * If a read fails, we try reading from something else for which READ | |
1693 | * is OK. | |
1da177e4 | 1694 | */ |
1da177e4 | 1695 | |
1da177e4 LT |
1696 | r1_bio->mddev = mddev; |
1697 | r1_bio->sector = sector_nr; | |
191ea9b2 | 1698 | r1_bio->state = 0; |
1da177e4 | 1699 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
1700 | |
1701 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 1702 | mdk_rdev_t *rdev; |
1da177e4 LT |
1703 | bio = r1_bio->bios[i]; |
1704 | ||
1705 | /* take from bio_init */ | |
1706 | bio->bi_next = NULL; | |
db8d9d35 | 1707 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 1708 | bio->bi_flags |= 1 << BIO_UPTODATE; |
db8d9d35 | 1709 | bio->bi_comp_cpu = -1; |
802ba064 | 1710 | bio->bi_rw = READ; |
1da177e4 LT |
1711 | bio->bi_vcnt = 0; |
1712 | bio->bi_idx = 0; | |
1713 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
1714 | bio->bi_size = 0; |
1715 | bio->bi_end_io = NULL; | |
1716 | bio->bi_private = NULL; | |
1717 | ||
3e198f78 N |
1718 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
1719 | if (rdev == NULL || | |
1720 | test_bit(Faulty, &rdev->flags)) { | |
e3b9703e N |
1721 | still_degraded = 1; |
1722 | continue; | |
3e198f78 | 1723 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
1724 | bio->bi_rw = WRITE; |
1725 | bio->bi_end_io = end_sync_write; | |
1726 | write_targets ++; | |
3e198f78 N |
1727 | } else { |
1728 | /* may need to read from here */ | |
1729 | bio->bi_rw = READ; | |
1730 | bio->bi_end_io = end_sync_read; | |
1731 | if (test_bit(WriteMostly, &rdev->flags)) { | |
1732 | if (wonly < 0) | |
1733 | wonly = i; | |
1734 | } else { | |
1735 | if (disk < 0) | |
1736 | disk = i; | |
1737 | } | |
1738 | read_targets++; | |
1739 | } | |
1740 | atomic_inc(&rdev->nr_pending); | |
1741 | bio->bi_sector = sector_nr + rdev->data_offset; | |
1742 | bio->bi_bdev = rdev->bdev; | |
1da177e4 LT |
1743 | bio->bi_private = r1_bio; |
1744 | } | |
3e198f78 N |
1745 | rcu_read_unlock(); |
1746 | if (disk < 0) | |
1747 | disk = wonly; | |
1748 | r1_bio->read_disk = disk; | |
191ea9b2 | 1749 | |
3e198f78 N |
1750 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
1751 | /* extra read targets are also write targets */ | |
1752 | write_targets += read_targets-1; | |
1753 | ||
1754 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
1755 | /* There is nowhere to write, so all non-sync |
1756 | * drives must be failed - so we are finished | |
1757 | */ | |
57afd89f N |
1758 | sector_t rv = max_sector - sector_nr; |
1759 | *skipped = 1; | |
1da177e4 | 1760 | put_buf(r1_bio); |
1da177e4 LT |
1761 | return rv; |
1762 | } | |
1763 | ||
c6207277 N |
1764 | if (max_sector > mddev->resync_max) |
1765 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
1da177e4 | 1766 | nr_sectors = 0; |
289e99e8 | 1767 | sync_blocks = 0; |
1da177e4 LT |
1768 | do { |
1769 | struct page *page; | |
1770 | int len = PAGE_SIZE; | |
1771 | if (sector_nr + (len>>9) > max_sector) | |
1772 | len = (max_sector - sector_nr) << 9; | |
1773 | if (len == 0) | |
1774 | break; | |
6a806c51 N |
1775 | if (sync_blocks == 0) { |
1776 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
1777 | &sync_blocks, still_degraded) && |
1778 | !conf->fullsync && | |
1779 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 1780 | break; |
9e77c485 | 1781 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 1782 | if ((len >> 9) > sync_blocks) |
6a806c51 | 1783 | len = sync_blocks<<9; |
ab7a30c7 | 1784 | } |
191ea9b2 | 1785 | |
1da177e4 LT |
1786 | for (i=0 ; i < conf->raid_disks; i++) { |
1787 | bio = r1_bio->bios[i]; | |
1788 | if (bio->bi_end_io) { | |
d11c171e | 1789 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
1790 | if (bio_add_page(bio, page, len, 0) == 0) { |
1791 | /* stop here */ | |
d11c171e | 1792 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
1793 | while (i > 0) { |
1794 | i--; | |
1795 | bio = r1_bio->bios[i]; | |
6a806c51 N |
1796 | if (bio->bi_end_io==NULL) |
1797 | continue; | |
1da177e4 LT |
1798 | /* remove last page from this bio */ |
1799 | bio->bi_vcnt--; | |
1800 | bio->bi_size -= len; | |
1801 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1802 | } | |
1803 | goto bio_full; | |
1804 | } | |
1805 | } | |
1806 | } | |
1807 | nr_sectors += len>>9; | |
1808 | sector_nr += len>>9; | |
191ea9b2 | 1809 | sync_blocks -= (len>>9); |
1da177e4 LT |
1810 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1811 | bio_full: | |
1da177e4 LT |
1812 | r1_bio->sectors = nr_sectors; |
1813 | ||
d11c171e N |
1814 | /* For a user-requested sync, we read all readable devices and do a |
1815 | * compare | |
1816 | */ | |
1817 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1818 | atomic_set(&r1_bio->remaining, read_targets); | |
1819 | for (i=0; i<conf->raid_disks; i++) { | |
1820 | bio = r1_bio->bios[i]; | |
1821 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 1822 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
1823 | generic_make_request(bio); |
1824 | } | |
1825 | } | |
1826 | } else { | |
1827 | atomic_set(&r1_bio->remaining, 1); | |
1828 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 1829 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 1830 | generic_make_request(bio); |
1da177e4 | 1831 | |
d11c171e | 1832 | } |
1da177e4 LT |
1833 | return nr_sectors; |
1834 | } | |
1835 | ||
80c3a6ce DW |
1836 | static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) |
1837 | { | |
1838 | if (sectors) | |
1839 | return sectors; | |
1840 | ||
1841 | return mddev->dev_sectors; | |
1842 | } | |
1843 | ||
709ae487 | 1844 | static conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
1845 | { |
1846 | conf_t *conf; | |
709ae487 | 1847 | int i; |
1da177e4 LT |
1848 | mirror_info_t *disk; |
1849 | mdk_rdev_t *rdev; | |
709ae487 | 1850 | int err = -ENOMEM; |
1da177e4 | 1851 | |
9ffae0cf | 1852 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 | 1853 | if (!conf) |
709ae487 | 1854 | goto abort; |
1da177e4 | 1855 | |
9ffae0cf | 1856 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
1857 | GFP_KERNEL); |
1858 | if (!conf->mirrors) | |
709ae487 | 1859 | goto abort; |
1da177e4 | 1860 | |
ddaf22ab N |
1861 | conf->tmppage = alloc_page(GFP_KERNEL); |
1862 | if (!conf->tmppage) | |
709ae487 | 1863 | goto abort; |
ddaf22ab | 1864 | |
709ae487 | 1865 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 1866 | if (!conf->poolinfo) |
709ae487 | 1867 | goto abort; |
1da177e4 LT |
1868 | conf->poolinfo->raid_disks = mddev->raid_disks; |
1869 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
1870 | r1bio_pool_free, | |
1871 | conf->poolinfo); | |
1872 | if (!conf->r1bio_pool) | |
709ae487 N |
1873 | goto abort; |
1874 | ||
ed9bfdf1 | 1875 | conf->poolinfo->mddev = mddev; |
1da177e4 | 1876 | |
e7e72bf6 | 1877 | spin_lock_init(&conf->device_lock); |
159ec1fc | 1878 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 1879 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
1880 | if (disk_idx >= mddev->raid_disks |
1881 | || disk_idx < 0) | |
1882 | continue; | |
1883 | disk = conf->mirrors + disk_idx; | |
1884 | ||
1885 | disk->rdev = rdev; | |
1da177e4 LT |
1886 | |
1887 | disk->head_position = 0; | |
1da177e4 LT |
1888 | } |
1889 | conf->raid_disks = mddev->raid_disks; | |
1890 | conf->mddev = mddev; | |
1da177e4 | 1891 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
1892 | |
1893 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 1894 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 1895 | |
191ea9b2 | 1896 | bio_list_init(&conf->pending_bio_list); |
191ea9b2 | 1897 | |
709ae487 | 1898 | conf->last_used = -1; |
1da177e4 LT |
1899 | for (i = 0; i < conf->raid_disks; i++) { |
1900 | ||
1901 | disk = conf->mirrors + i; | |
1902 | ||
5fd6c1dc N |
1903 | if (!disk->rdev || |
1904 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 1905 | disk->head_position = 0; |
918f0238 N |
1906 | if (disk->rdev) |
1907 | conf->fullsync = 1; | |
709ae487 N |
1908 | } else if (conf->last_used < 0) |
1909 | /* | |
1910 | * The first working device is used as a | |
1911 | * starting point to read balancing. | |
1912 | */ | |
1913 | conf->last_used = i; | |
1da177e4 | 1914 | } |
709ae487 N |
1915 | |
1916 | err = -EIO; | |
1917 | if (conf->last_used < 0) { | |
9dd1e2fa | 1918 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
1919 | mdname(mddev)); |
1920 | goto abort; | |
1921 | } | |
1922 | err = -ENOMEM; | |
1923 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
1924 | if (!conf->thread) { | |
1925 | printk(KERN_ERR | |
9dd1e2fa | 1926 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
1927 | mdname(mddev)); |
1928 | goto abort; | |
11ce99e6 | 1929 | } |
1da177e4 | 1930 | |
709ae487 N |
1931 | return conf; |
1932 | ||
1933 | abort: | |
1934 | if (conf) { | |
1935 | if (conf->r1bio_pool) | |
1936 | mempool_destroy(conf->r1bio_pool); | |
1937 | kfree(conf->mirrors); | |
1938 | safe_put_page(conf->tmppage); | |
1939 | kfree(conf->poolinfo); | |
1940 | kfree(conf); | |
1941 | } | |
1942 | return ERR_PTR(err); | |
1943 | } | |
1944 | ||
1945 | static int run(mddev_t *mddev) | |
1946 | { | |
1947 | conf_t *conf; | |
1948 | int i; | |
1949 | mdk_rdev_t *rdev; | |
1950 | ||
1951 | if (mddev->level != 1) { | |
9dd1e2fa | 1952 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
1953 | mdname(mddev), mddev->level); |
1954 | return -EIO; | |
1955 | } | |
1956 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 1957 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
1958 | mdname(mddev)); |
1959 | return -EIO; | |
1960 | } | |
1da177e4 | 1961 | /* |
709ae487 N |
1962 | * copy the already verified devices into our private RAID1 |
1963 | * bookkeeping area. [whatever we allocate in run(), | |
1964 | * should be freed in stop()] | |
1da177e4 | 1965 | */ |
709ae487 N |
1966 | if (mddev->private == NULL) |
1967 | conf = setup_conf(mddev); | |
1968 | else | |
1969 | conf = mddev->private; | |
1da177e4 | 1970 | |
709ae487 N |
1971 | if (IS_ERR(conf)) |
1972 | return PTR_ERR(conf); | |
1da177e4 | 1973 | |
709ae487 N |
1974 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1975 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1976 | rdev->data_offset << 9); | |
1977 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
1978 | * violating it, so limit ->max_segments to 1 lying within |
1979 | * a single page, as a one page request is never in violation. | |
709ae487 | 1980 | */ |
627a2d3c N |
1981 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1982 | blk_queue_max_segments(mddev->queue, 1); | |
1983 | blk_queue_segment_boundary(mddev->queue, | |
1984 | PAGE_CACHE_SIZE - 1); | |
1985 | } | |
1da177e4 | 1986 | } |
191ea9b2 | 1987 | |
709ae487 N |
1988 | mddev->degraded = 0; |
1989 | for (i=0; i < conf->raid_disks; i++) | |
1990 | if (conf->mirrors[i].rdev == NULL || | |
1991 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
1992 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
1993 | mddev->degraded++; | |
1994 | ||
1995 | if (conf->raid_disks - mddev->degraded == 1) | |
1996 | mddev->recovery_cp = MaxSector; | |
1997 | ||
8c6ac868 | 1998 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 1999 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2000 | " -- starting background reconstruction\n", |
2001 | mdname(mddev)); | |
1da177e4 | 2002 | printk(KERN_INFO |
9dd1e2fa | 2003 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2004 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2005 | mddev->raid_disks); | |
709ae487 | 2006 | |
1da177e4 LT |
2007 | /* |
2008 | * Ok, everything is just fine now | |
2009 | */ | |
709ae487 N |
2010 | mddev->thread = conf->thread; |
2011 | conf->thread = NULL; | |
2012 | mddev->private = conf; | |
2013 | ||
1f403624 | 2014 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2015 | |
0d129228 N |
2016 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; |
2017 | mddev->queue->backing_dev_info.congested_data = mddev; | |
a91a2785 | 2018 | return md_integrity_register(mddev); |
1da177e4 LT |
2019 | } |
2020 | ||
2021 | static int stop(mddev_t *mddev) | |
2022 | { | |
070ec55d | 2023 | conf_t *conf = mddev->private; |
4b6d287f | 2024 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2025 | |
2026 | /* wait for behind writes to complete */ | |
e555190d | 2027 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2028 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2029 | mdname(mddev)); | |
4b6d287f | 2030 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2031 | wait_event(bitmap->behind_wait, |
2032 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2033 | } |
1da177e4 | 2034 | |
409c57f3 N |
2035 | raise_barrier(conf); |
2036 | lower_barrier(conf); | |
2037 | ||
1da177e4 LT |
2038 | md_unregister_thread(mddev->thread); |
2039 | mddev->thread = NULL; | |
1da177e4 LT |
2040 | if (conf->r1bio_pool) |
2041 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2042 | kfree(conf->mirrors); |
2043 | kfree(conf->poolinfo); | |
1da177e4 LT |
2044 | kfree(conf); |
2045 | mddev->private = NULL; | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2050 | { | |
2051 | /* no resync is happening, and there is enough space | |
2052 | * on all devices, so we can resize. | |
2053 | * We need to make sure resync covers any new space. | |
2054 | * If the array is shrinking we should possibly wait until | |
2055 | * any io in the removed space completes, but it hardly seems | |
2056 | * worth it. | |
2057 | */ | |
1f403624 | 2058 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2059 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2060 | return -EINVAL; | |
f233ea5c | 2061 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2062 | revalidate_disk(mddev->gendisk); |
b522adcd | 2063 | if (sectors > mddev->dev_sectors && |
b098636c | 2064 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2065 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2066 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2067 | } | |
b522adcd | 2068 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2069 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2070 | return 0; |
2071 | } | |
2072 | ||
63c70c4f | 2073 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2074 | { |
2075 | /* We need to: | |
2076 | * 1/ resize the r1bio_pool | |
2077 | * 2/ resize conf->mirrors | |
2078 | * | |
2079 | * We allocate a new r1bio_pool if we can. | |
2080 | * Then raise a device barrier and wait until all IO stops. | |
2081 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2082 | * |
2083 | * At the same time, we "pack" the devices so that all the missing | |
2084 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2085 | */ |
2086 | mempool_t *newpool, *oldpool; | |
2087 | struct pool_info *newpoolinfo; | |
2088 | mirror_info_t *newmirrors; | |
070ec55d | 2089 | conf_t *conf = mddev->private; |
63c70c4f | 2090 | int cnt, raid_disks; |
c04be0aa | 2091 | unsigned long flags; |
b5470dc5 | 2092 | int d, d2, err; |
1da177e4 | 2093 | |
63c70c4f | 2094 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2095 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2096 | mddev->layout != mddev->new_layout || |
2097 | mddev->level != mddev->new_level) { | |
664e7c41 | 2098 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2099 | mddev->new_layout = mddev->layout; |
2100 | mddev->new_level = mddev->level; | |
2101 | return -EINVAL; | |
2102 | } | |
2103 | ||
b5470dc5 DW |
2104 | err = md_allow_write(mddev); |
2105 | if (err) | |
2106 | return err; | |
2a2275d6 | 2107 | |
63c70c4f N |
2108 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2109 | ||
6ea9c07c N |
2110 | if (raid_disks < conf->raid_disks) { |
2111 | cnt=0; | |
2112 | for (d= 0; d < conf->raid_disks; d++) | |
2113 | if (conf->mirrors[d].rdev) | |
2114 | cnt++; | |
2115 | if (cnt > raid_disks) | |
1da177e4 | 2116 | return -EBUSY; |
6ea9c07c | 2117 | } |
1da177e4 LT |
2118 | |
2119 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2120 | if (!newpoolinfo) | |
2121 | return -ENOMEM; | |
2122 | newpoolinfo->mddev = mddev; | |
2123 | newpoolinfo->raid_disks = raid_disks; | |
2124 | ||
2125 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2126 | r1bio_pool_free, newpoolinfo); | |
2127 | if (!newpool) { | |
2128 | kfree(newpoolinfo); | |
2129 | return -ENOMEM; | |
2130 | } | |
9ffae0cf | 2131 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2132 | if (!newmirrors) { |
2133 | kfree(newpoolinfo); | |
2134 | mempool_destroy(newpool); | |
2135 | return -ENOMEM; | |
2136 | } | |
1da177e4 | 2137 | |
17999be4 | 2138 | raise_barrier(conf); |
1da177e4 LT |
2139 | |
2140 | /* ok, everything is stopped */ | |
2141 | oldpool = conf->r1bio_pool; | |
2142 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2143 | |
a88aa786 N |
2144 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2145 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2146 | if (rdev && rdev->raid_disk != d2) { | |
2147 | char nm[20]; | |
2148 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2149 | sysfs_remove_link(&mddev->kobj, nm); | |
2150 | rdev->raid_disk = d2; | |
2151 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2152 | sysfs_remove_link(&mddev->kobj, nm); | |
2153 | if (sysfs_create_link(&mddev->kobj, | |
2154 | &rdev->kobj, nm)) | |
2155 | printk(KERN_WARNING | |
9dd1e2fa N |
2156 | "md/raid1:%s: cannot register " |
2157 | "%s\n", | |
2158 | mdname(mddev), nm); | |
6ea9c07c | 2159 | } |
a88aa786 N |
2160 | if (rdev) |
2161 | newmirrors[d2++].rdev = rdev; | |
2162 | } | |
1da177e4 LT |
2163 | kfree(conf->mirrors); |
2164 | conf->mirrors = newmirrors; | |
2165 | kfree(conf->poolinfo); | |
2166 | conf->poolinfo = newpoolinfo; | |
2167 | ||
c04be0aa | 2168 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2169 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2170 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2171 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2172 | mddev->delta_disks = 0; |
1da177e4 | 2173 | |
6ea9c07c | 2174 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2175 | lower_barrier(conf); |
1da177e4 LT |
2176 | |
2177 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2178 | md_wakeup_thread(mddev->thread); | |
2179 | ||
2180 | mempool_destroy(oldpool); | |
2181 | return 0; | |
2182 | } | |
2183 | ||
500af87a | 2184 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 | 2185 | { |
070ec55d | 2186 | conf_t *conf = mddev->private; |
36fa3063 N |
2187 | |
2188 | switch(state) { | |
6eef4b21 N |
2189 | case 2: /* wake for suspend */ |
2190 | wake_up(&conf->wait_barrier); | |
2191 | break; | |
9e6603da | 2192 | case 1: |
17999be4 | 2193 | raise_barrier(conf); |
36fa3063 | 2194 | break; |
9e6603da | 2195 | case 0: |
17999be4 | 2196 | lower_barrier(conf); |
36fa3063 N |
2197 | break; |
2198 | } | |
36fa3063 N |
2199 | } |
2200 | ||
709ae487 N |
2201 | static void *raid1_takeover(mddev_t *mddev) |
2202 | { | |
2203 | /* raid1 can take over: | |
2204 | * raid5 with 2 devices, any layout or chunk size | |
2205 | */ | |
2206 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
2207 | conf_t *conf; | |
2208 | mddev->new_level = 1; | |
2209 | mddev->new_layout = 0; | |
2210 | mddev->new_chunk_sectors = 0; | |
2211 | conf = setup_conf(mddev); | |
2212 | if (!IS_ERR(conf)) | |
2213 | conf->barrier = 1; | |
2214 | return conf; | |
2215 | } | |
2216 | return ERR_PTR(-EINVAL); | |
2217 | } | |
1da177e4 | 2218 | |
2604b703 | 2219 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2220 | { |
2221 | .name = "raid1", | |
2604b703 | 2222 | .level = 1, |
1da177e4 LT |
2223 | .owner = THIS_MODULE, |
2224 | .make_request = make_request, | |
2225 | .run = run, | |
2226 | .stop = stop, | |
2227 | .status = status, | |
2228 | .error_handler = error, | |
2229 | .hot_add_disk = raid1_add_disk, | |
2230 | .hot_remove_disk= raid1_remove_disk, | |
2231 | .spare_active = raid1_spare_active, | |
2232 | .sync_request = sync_request, | |
2233 | .resize = raid1_resize, | |
80c3a6ce | 2234 | .size = raid1_size, |
63c70c4f | 2235 | .check_reshape = raid1_reshape, |
36fa3063 | 2236 | .quiesce = raid1_quiesce, |
709ae487 | 2237 | .takeover = raid1_takeover, |
1da177e4 LT |
2238 | }; |
2239 | ||
2240 | static int __init raid_init(void) | |
2241 | { | |
2604b703 | 2242 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2243 | } |
2244 | ||
2245 | static void raid_exit(void) | |
2246 | { | |
2604b703 | 2247 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2248 | } |
2249 | ||
2250 | module_init(raid_init); | |
2251 | module_exit(raid_exit); | |
2252 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2253 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2254 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2255 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2256 | MODULE_ALIAS("md-level-1"); |