Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
bff61975 | 37 | #include <linux/seq_file.h> |
8bda470e | 38 | #include <linux/ratelimit.h> |
43b2e5d8 | 39 | #include "md.h" |
ef740c37 CH |
40 | #include "raid1.h" |
41 | #include "bitmap.h" | |
191ea9b2 N |
42 | |
43 | #define DEBUG 0 | |
44 | #if DEBUG | |
45 | #define PRINTK(x...) printk(x) | |
46 | #else | |
47 | #define PRINTK(x...) | |
48 | #endif | |
1da177e4 LT |
49 | |
50 | /* | |
51 | * Number of guaranteed r1bios in case of extreme VM load: | |
52 | */ | |
53 | #define NR_RAID1_BIOS 256 | |
54 | ||
1da177e4 | 55 | |
17999be4 N |
56 | static void allow_barrier(conf_t *conf); |
57 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 58 | |
dd0fc66f | 59 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
60 | { |
61 | struct pool_info *pi = data; | |
1da177e4 LT |
62 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); |
63 | ||
64 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 65 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
66 | } |
67 | ||
68 | static void r1bio_pool_free(void *r1_bio, void *data) | |
69 | { | |
70 | kfree(r1_bio); | |
71 | } | |
72 | ||
73 | #define RESYNC_BLOCK_SIZE (64*1024) | |
74 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
75 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
76 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
77 | #define RESYNC_WINDOW (2048*1024) | |
78 | ||
dd0fc66f | 79 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
80 | { |
81 | struct pool_info *pi = data; | |
82 | struct page *page; | |
83 | r1bio_t *r1_bio; | |
84 | struct bio *bio; | |
85 | int i, j; | |
86 | ||
87 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 88 | if (!r1_bio) |
1da177e4 | 89 | return NULL; |
1da177e4 LT |
90 | |
91 | /* | |
92 | * Allocate bios : 1 for reading, n-1 for writing | |
93 | */ | |
94 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 95 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
96 | if (!bio) |
97 | goto out_free_bio; | |
98 | r1_bio->bios[j] = bio; | |
99 | } | |
100 | /* | |
101 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
102 | * the first bio. |
103 | * If this is a user-requested check/repair, allocate | |
104 | * RESYNC_PAGES for each bio. | |
1da177e4 | 105 | */ |
d11c171e N |
106 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
107 | j = pi->raid_disks; | |
108 | else | |
109 | j = 1; | |
110 | while(j--) { | |
111 | bio = r1_bio->bios[j]; | |
112 | for (i = 0; i < RESYNC_PAGES; i++) { | |
113 | page = alloc_page(gfp_flags); | |
114 | if (unlikely(!page)) | |
115 | goto out_free_pages; | |
116 | ||
117 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 118 | bio->bi_vcnt = i+1; |
d11c171e N |
119 | } |
120 | } | |
121 | /* If not user-requests, copy the page pointers to all bios */ | |
122 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
123 | for (i=0; i<RESYNC_PAGES ; i++) | |
124 | for (j=1; j<pi->raid_disks; j++) | |
125 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
126 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
127 | } |
128 | ||
129 | r1_bio->master_bio = NULL; | |
130 | ||
131 | return r1_bio; | |
132 | ||
133 | out_free_pages: | |
303a0e11 N |
134 | for (j=0 ; j < pi->raid_disks; j++) |
135 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
136 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 137 | j = -1; |
1da177e4 LT |
138 | out_free_bio: |
139 | while ( ++j < pi->raid_disks ) | |
140 | bio_put(r1_bio->bios[j]); | |
141 | r1bio_pool_free(r1_bio, data); | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
146 | { | |
147 | struct pool_info *pi = data; | |
d11c171e | 148 | int i,j; |
1da177e4 | 149 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 150 | |
d11c171e N |
151 | for (i = 0; i < RESYNC_PAGES; i++) |
152 | for (j = pi->raid_disks; j-- ;) { | |
153 | if (j == 0 || | |
154 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
155 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 156 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 157 | } |
1da177e4 LT |
158 | for (i=0 ; i < pi->raid_disks; i++) |
159 | bio_put(r1bio->bios[i]); | |
160 | ||
161 | r1bio_pool_free(r1bio, data); | |
162 | } | |
163 | ||
164 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
165 | { | |
166 | int i; | |
167 | ||
168 | for (i = 0; i < conf->raid_disks; i++) { | |
169 | struct bio **bio = r1_bio->bios + i; | |
cf30a473 | 170 | if (*bio && *bio != IO_BLOCKED) |
1da177e4 LT |
171 | bio_put(*bio); |
172 | *bio = NULL; | |
173 | } | |
174 | } | |
175 | ||
858119e1 | 176 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 177 | { |
070ec55d | 178 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
179 | |
180 | /* | |
181 | * Wake up any possible resync thread that waits for the device | |
182 | * to go idle. | |
183 | */ | |
17999be4 | 184 | allow_barrier(conf); |
1da177e4 LT |
185 | |
186 | put_all_bios(conf, r1_bio); | |
187 | mempool_free(r1_bio, conf->r1bio_pool); | |
188 | } | |
189 | ||
858119e1 | 190 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 | 191 | { |
070ec55d | 192 | conf_t *conf = r1_bio->mddev->private; |
3e198f78 N |
193 | int i; |
194 | ||
195 | for (i=0; i<conf->raid_disks; i++) { | |
196 | struct bio *bio = r1_bio->bios[i]; | |
197 | if (bio->bi_end_io) | |
198 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
199 | } | |
1da177e4 LT |
200 | |
201 | mempool_free(r1_bio, conf->r1buf_pool); | |
202 | ||
17999be4 | 203 | lower_barrier(conf); |
1da177e4 LT |
204 | } |
205 | ||
206 | static void reschedule_retry(r1bio_t *r1_bio) | |
207 | { | |
208 | unsigned long flags; | |
209 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 210 | conf_t *conf = mddev->private; |
1da177e4 LT |
211 | |
212 | spin_lock_irqsave(&conf->device_lock, flags); | |
213 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 214 | conf->nr_queued ++; |
1da177e4 LT |
215 | spin_unlock_irqrestore(&conf->device_lock, flags); |
216 | ||
17999be4 | 217 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
218 | md_wakeup_thread(mddev->thread); |
219 | } | |
220 | ||
221 | /* | |
222 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
223 | * operation and are ready to return a success/failure code to the buffer | |
224 | * cache layer. | |
225 | */ | |
226 | static void raid_end_bio_io(r1bio_t *r1_bio) | |
227 | { | |
228 | struct bio *bio = r1_bio->master_bio; | |
229 | ||
4b6d287f N |
230 | /* if nobody has done the final endio yet, do it now */ |
231 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
232 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
233 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
234 | (unsigned long long) bio->bi_sector, | |
235 | (unsigned long long) bio->bi_sector + | |
236 | (bio->bi_size >> 9) - 1); | |
237 | ||
6712ecf8 | 238 | bio_endio(bio, |
4b6d287f N |
239 | test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); |
240 | } | |
1da177e4 LT |
241 | free_r1bio(r1_bio); |
242 | } | |
243 | ||
244 | /* | |
245 | * Update disk head position estimator based on IRQ completion info. | |
246 | */ | |
247 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
248 | { | |
070ec55d | 249 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
250 | |
251 | conf->mirrors[disk].head_position = | |
252 | r1_bio->sector + (r1_bio->sectors); | |
253 | } | |
254 | ||
6712ecf8 | 255 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
256 | { |
257 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 258 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 259 | int mirror; |
070ec55d | 260 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 261 | |
1da177e4 LT |
262 | mirror = r1_bio->read_disk; |
263 | /* | |
264 | * this branch is our 'one mirror IO has finished' event handler: | |
265 | */ | |
ddaf22ab N |
266 | update_head_pos(mirror, r1_bio); |
267 | ||
dd00a99e N |
268 | if (uptodate) |
269 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
270 | else { | |
271 | /* If all other devices have failed, we want to return | |
272 | * the error upwards rather than fail the last device. | |
273 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 274 | */ |
dd00a99e N |
275 | unsigned long flags; |
276 | spin_lock_irqsave(&conf->device_lock, flags); | |
277 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
278 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
279 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
280 | uptodate = 1; | |
281 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
282 | } | |
1da177e4 | 283 | |
dd00a99e | 284 | if (uptodate) |
1da177e4 | 285 | raid_end_bio_io(r1_bio); |
dd00a99e | 286 | else { |
1da177e4 LT |
287 | /* |
288 | * oops, read error: | |
289 | */ | |
290 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
291 | printk_ratelimited( |
292 | KERN_ERR "md/raid1:%s: %s: " | |
293 | "rescheduling sector %llu\n", | |
294 | mdname(conf->mddev), | |
295 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
296 | b), | |
297 | (unsigned long long)r1_bio->sector); | |
1da177e4 LT |
298 | reschedule_retry(r1_bio); |
299 | } | |
300 | ||
301 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
302 | } |
303 | ||
af6d7b76 | 304 | static void r1_bio_write_done(r1bio_t *r1_bio) |
4e78064f N |
305 | { |
306 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
307 | { | |
308 | /* it really is the end of this request */ | |
309 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
310 | /* free extra copy of the data pages */ | |
af6d7b76 | 311 | int i = r1_bio->behind_page_count; |
4e78064f | 312 | while (i--) |
af6d7b76 N |
313 | safe_put_page(r1_bio->behind_pages[i]); |
314 | kfree(r1_bio->behind_pages); | |
315 | r1_bio->behind_pages = NULL; | |
4e78064f N |
316 | } |
317 | /* clear the bitmap if all writes complete successfully */ | |
318 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
319 | r1_bio->sectors, | |
320 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
af6d7b76 | 321 | test_bit(R1BIO_BehindIO, &r1_bio->state)); |
4e78064f N |
322 | md_write_end(r1_bio->mddev); |
323 | raid_end_bio_io(r1_bio); | |
324 | } | |
325 | } | |
326 | ||
6712ecf8 | 327 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
328 | { |
329 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 330 | r1bio_t *r1_bio = bio->bi_private; |
a9701a30 | 331 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
070ec55d | 332 | conf_t *conf = r1_bio->mddev->private; |
04b857f7 | 333 | struct bio *to_put = NULL; |
1da177e4 | 334 | |
1da177e4 LT |
335 | |
336 | for (mirror = 0; mirror < conf->raid_disks; mirror++) | |
337 | if (r1_bio->bios[mirror] == bio) | |
338 | break; | |
339 | ||
e9c7469b TH |
340 | /* |
341 | * 'one mirror IO has finished' event handler: | |
342 | */ | |
343 | r1_bio->bios[mirror] = NULL; | |
344 | to_put = bio; | |
345 | if (!uptodate) { | |
346 | md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); | |
347 | /* an I/O failed, we can't clear the bitmap */ | |
348 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
349 | } else | |
1da177e4 | 350 | /* |
e9c7469b TH |
351 | * Set R1BIO_Uptodate in our master bio, so that we |
352 | * will return a good error code for to the higher | |
353 | * levels even if IO on some other mirrored buffer | |
354 | * fails. | |
355 | * | |
356 | * The 'master' represents the composite IO operation | |
357 | * to user-side. So if something waits for IO, then it | |
358 | * will wait for the 'master' bio. | |
1da177e4 | 359 | */ |
e9c7469b TH |
360 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
361 | ||
362 | update_head_pos(mirror, r1_bio); | |
363 | ||
364 | if (behind) { | |
365 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
366 | atomic_dec(&r1_bio->behind_remaining); | |
367 | ||
368 | /* | |
369 | * In behind mode, we ACK the master bio once the I/O | |
370 | * has safely reached all non-writemostly | |
371 | * disks. Setting the Returned bit ensures that this | |
372 | * gets done only once -- we don't ever want to return | |
373 | * -EIO here, instead we'll wait | |
374 | */ | |
375 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
376 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
377 | /* Maybe we can return now */ | |
378 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
379 | struct bio *mbio = r1_bio->master_bio; | |
380 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
381 | (unsigned long long) mbio->bi_sector, | |
382 | (unsigned long long) mbio->bi_sector + | |
383 | (mbio->bi_size >> 9) - 1); | |
384 | bio_endio(mbio, 0); | |
4b6d287f N |
385 | } |
386 | } | |
387 | } | |
e9c7469b TH |
388 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
389 | ||
1da177e4 | 390 | /* |
1da177e4 LT |
391 | * Let's see if all mirrored write operations have finished |
392 | * already. | |
393 | */ | |
af6d7b76 | 394 | r1_bio_write_done(r1_bio); |
c70810b3 | 395 | |
04b857f7 N |
396 | if (to_put) |
397 | bio_put(to_put); | |
1da177e4 LT |
398 | } |
399 | ||
400 | ||
401 | /* | |
402 | * This routine returns the disk from which the requested read should | |
403 | * be done. There is a per-array 'next expected sequential IO' sector | |
404 | * number - if this matches on the next IO then we use the last disk. | |
405 | * There is also a per-disk 'last know head position' sector that is | |
406 | * maintained from IRQ contexts, both the normal and the resync IO | |
407 | * completion handlers update this position correctly. If there is no | |
408 | * perfect sequential match then we pick the disk whose head is closest. | |
409 | * | |
410 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
411 | * because position is mirror, not device based. | |
412 | * | |
413 | * The rdev for the device selected will have nr_pending incremented. | |
414 | */ | |
415 | static int read_balance(conf_t *conf, r1bio_t *r1_bio) | |
416 | { | |
af3a2cd6 | 417 | const sector_t this_sector = r1_bio->sector; |
1da177e4 | 418 | const int sectors = r1_bio->sectors; |
f3ac8bf7 | 419 | int start_disk; |
76073054 | 420 | int best_disk; |
f3ac8bf7 | 421 | int i; |
76073054 | 422 | sector_t best_dist; |
8ddf9efe | 423 | mdk_rdev_t *rdev; |
f3ac8bf7 | 424 | int choose_first; |
1da177e4 LT |
425 | |
426 | rcu_read_lock(); | |
427 | /* | |
8ddf9efe | 428 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
429 | * device if no resync is going on, or below the resync window. |
430 | * We take the first readable disk when above the resync window. | |
431 | */ | |
432 | retry: | |
76073054 N |
433 | best_disk = -1; |
434 | best_dist = MaxSector; | |
1da177e4 LT |
435 | if (conf->mddev->recovery_cp < MaxSector && |
436 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
437 | choose_first = 1; |
438 | start_disk = 0; | |
439 | } else { | |
440 | choose_first = 0; | |
441 | start_disk = conf->last_used; | |
1da177e4 LT |
442 | } |
443 | ||
f3ac8bf7 | 444 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 445 | sector_t dist; |
f3ac8bf7 N |
446 | int disk = start_disk + i; |
447 | if (disk >= conf->raid_disks) | |
448 | disk -= conf->raid_disks; | |
449 | ||
450 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
451 | if (r1_bio->bios[disk] == IO_BLOCKED | |
452 | || rdev == NULL | |
76073054 | 453 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 454 | continue; |
76073054 N |
455 | if (!test_bit(In_sync, &rdev->flags) && |
456 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 457 | continue; |
76073054 N |
458 | if (test_bit(WriteMostly, &rdev->flags)) { |
459 | /* Don't balance among write-mostly, just | |
460 | * use the first as a last resort */ | |
461 | if (best_disk < 0) | |
462 | best_disk = disk; | |
463 | continue; | |
464 | } | |
465 | /* This is a reasonable device to use. It might | |
466 | * even be best. | |
467 | */ | |
468 | dist = abs(this_sector - conf->mirrors[disk].head_position); | |
469 | if (choose_first | |
470 | /* Don't change to another disk for sequential reads */ | |
471 | || conf->next_seq_sect == this_sector | |
472 | || dist == 0 | |
473 | /* If device is idle, use it */ | |
474 | || atomic_read(&rdev->nr_pending) == 0) { | |
475 | best_disk = disk; | |
1da177e4 LT |
476 | break; |
477 | } | |
76073054 N |
478 | if (dist < best_dist) { |
479 | best_dist = dist; | |
480 | best_disk = disk; | |
1da177e4 | 481 | } |
f3ac8bf7 | 482 | } |
1da177e4 | 483 | |
76073054 N |
484 | if (best_disk >= 0) { |
485 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
486 | if (!rdev) |
487 | goto retry; | |
488 | atomic_inc(&rdev->nr_pending); | |
76073054 | 489 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
490 | /* cannot risk returning a device that failed |
491 | * before we inc'ed nr_pending | |
492 | */ | |
03c902e1 | 493 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
494 | goto retry; |
495 | } | |
8ddf9efe | 496 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 497 | conf->last_used = best_disk; |
1da177e4 LT |
498 | } |
499 | rcu_read_unlock(); | |
500 | ||
76073054 | 501 | return best_disk; |
1da177e4 LT |
502 | } |
503 | ||
1ed7242e | 504 | int md_raid1_congested(mddev_t *mddev, int bits) |
0d129228 | 505 | { |
070ec55d | 506 | conf_t *conf = mddev->private; |
0d129228 N |
507 | int i, ret = 0; |
508 | ||
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 | 514 | |
1ed7242e JB |
515 | BUG_ON(!q); |
516 | ||
0d129228 N |
517 | /* Note the '|| 1' - when read_balance prefers |
518 | * non-congested targets, it can be removed | |
519 | */ | |
91a9e99d | 520 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
521 | ret |= bdi_congested(&q->backing_dev_info, bits); |
522 | else | |
523 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
524 | } | |
525 | } | |
526 | rcu_read_unlock(); | |
527 | return ret; | |
528 | } | |
1ed7242e | 529 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 530 | |
1ed7242e JB |
531 | static int raid1_congested(void *data, int bits) |
532 | { | |
533 | mddev_t *mddev = data; | |
534 | ||
535 | return mddev_congested(mddev, bits) || | |
536 | md_raid1_congested(mddev, bits); | |
537 | } | |
0d129228 | 538 | |
7eaceacc | 539 | static void flush_pending_writes(conf_t *conf) |
a35e63ef N |
540 | { |
541 | /* Any writes that have been queued but are awaiting | |
542 | * bitmap updates get flushed here. | |
a35e63ef | 543 | */ |
a35e63ef N |
544 | spin_lock_irq(&conf->device_lock); |
545 | ||
546 | if (conf->pending_bio_list.head) { | |
547 | struct bio *bio; | |
548 | bio = bio_list_get(&conf->pending_bio_list); | |
a35e63ef N |
549 | spin_unlock_irq(&conf->device_lock); |
550 | /* flush any pending bitmap writes to | |
551 | * disk before proceeding w/ I/O */ | |
552 | bitmap_unplug(conf->mddev->bitmap); | |
553 | ||
554 | while (bio) { /* submit pending writes */ | |
555 | struct bio *next = bio->bi_next; | |
556 | bio->bi_next = NULL; | |
557 | generic_make_request(bio); | |
558 | bio = next; | |
559 | } | |
a35e63ef N |
560 | } else |
561 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
562 | } |
563 | ||
17999be4 N |
564 | /* Barriers.... |
565 | * Sometimes we need to suspend IO while we do something else, | |
566 | * either some resync/recovery, or reconfigure the array. | |
567 | * To do this we raise a 'barrier'. | |
568 | * The 'barrier' is a counter that can be raised multiple times | |
569 | * to count how many activities are happening which preclude | |
570 | * normal IO. | |
571 | * We can only raise the barrier if there is no pending IO. | |
572 | * i.e. if nr_pending == 0. | |
573 | * We choose only to raise the barrier if no-one is waiting for the | |
574 | * barrier to go down. This means that as soon as an IO request | |
575 | * is ready, no other operations which require a barrier will start | |
576 | * until the IO request has had a chance. | |
577 | * | |
578 | * So: regular IO calls 'wait_barrier'. When that returns there | |
579 | * is no backgroup IO happening, It must arrange to call | |
580 | * allow_barrier when it has finished its IO. | |
581 | * backgroup IO calls must call raise_barrier. Once that returns | |
582 | * there is no normal IO happeing. It must arrange to call | |
583 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
584 | */ |
585 | #define RESYNC_DEPTH 32 | |
586 | ||
17999be4 | 587 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
588 | { |
589 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
590 | |
591 | /* Wait until no block IO is waiting */ | |
592 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 593 | conf->resync_lock, ); |
17999be4 N |
594 | |
595 | /* block any new IO from starting */ | |
596 | conf->barrier++; | |
597 | ||
046abeed | 598 | /* Now wait for all pending IO to complete */ |
17999be4 N |
599 | wait_event_lock_irq(conf->wait_barrier, |
600 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 601 | conf->resync_lock, ); |
17999be4 N |
602 | |
603 | spin_unlock_irq(&conf->resync_lock); | |
604 | } | |
605 | ||
606 | static void lower_barrier(conf_t *conf) | |
607 | { | |
608 | unsigned long flags; | |
709ae487 | 609 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
610 | spin_lock_irqsave(&conf->resync_lock, flags); |
611 | conf->barrier--; | |
612 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
613 | wake_up(&conf->wait_barrier); | |
614 | } | |
615 | ||
616 | static void wait_barrier(conf_t *conf) | |
617 | { | |
618 | spin_lock_irq(&conf->resync_lock); | |
619 | if (conf->barrier) { | |
620 | conf->nr_waiting++; | |
621 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
622 | conf->resync_lock, | |
c3b328ac | 623 | ); |
17999be4 | 624 | conf->nr_waiting--; |
1da177e4 | 625 | } |
17999be4 | 626 | conf->nr_pending++; |
1da177e4 LT |
627 | spin_unlock_irq(&conf->resync_lock); |
628 | } | |
629 | ||
17999be4 N |
630 | static void allow_barrier(conf_t *conf) |
631 | { | |
632 | unsigned long flags; | |
633 | spin_lock_irqsave(&conf->resync_lock, flags); | |
634 | conf->nr_pending--; | |
635 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
636 | wake_up(&conf->wait_barrier); | |
637 | } | |
638 | ||
ddaf22ab N |
639 | static void freeze_array(conf_t *conf) |
640 | { | |
641 | /* stop syncio and normal IO and wait for everything to | |
642 | * go quite. | |
643 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
644 | * wait until nr_pending match nr_queued+1 |
645 | * This is called in the context of one normal IO request | |
646 | * that has failed. Thus any sync request that might be pending | |
647 | * will be blocked by nr_pending, and we need to wait for | |
648 | * pending IO requests to complete or be queued for re-try. | |
649 | * Thus the number queued (nr_queued) plus this request (1) | |
650 | * must match the number of pending IOs (nr_pending) before | |
651 | * we continue. | |
ddaf22ab N |
652 | */ |
653 | spin_lock_irq(&conf->resync_lock); | |
654 | conf->barrier++; | |
655 | conf->nr_waiting++; | |
656 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 657 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 658 | conf->resync_lock, |
c3b328ac | 659 | flush_pending_writes(conf)); |
ddaf22ab N |
660 | spin_unlock_irq(&conf->resync_lock); |
661 | } | |
662 | static void unfreeze_array(conf_t *conf) | |
663 | { | |
664 | /* reverse the effect of the freeze */ | |
665 | spin_lock_irq(&conf->resync_lock); | |
666 | conf->barrier--; | |
667 | conf->nr_waiting--; | |
668 | wake_up(&conf->wait_barrier); | |
669 | spin_unlock_irq(&conf->resync_lock); | |
670 | } | |
671 | ||
17999be4 | 672 | |
4e78064f | 673 | /* duplicate the data pages for behind I/O |
4e78064f | 674 | */ |
af6d7b76 | 675 | static void alloc_behind_pages(struct bio *bio, r1bio_t *r1_bio) |
4b6d287f N |
676 | { |
677 | int i; | |
678 | struct bio_vec *bvec; | |
af6d7b76 | 679 | struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page*), |
4b6d287f N |
680 | GFP_NOIO); |
681 | if (unlikely(!pages)) | |
af6d7b76 | 682 | return; |
4b6d287f | 683 | |
4b6d287f | 684 | bio_for_each_segment(bvec, bio, i) { |
af6d7b76 N |
685 | pages[i] = alloc_page(GFP_NOIO); |
686 | if (unlikely(!pages[i])) | |
4b6d287f | 687 | goto do_sync_io; |
af6d7b76 | 688 | memcpy(kmap(pages[i]) + bvec->bv_offset, |
4b6d287f | 689 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); |
af6d7b76 | 690 | kunmap(pages[i]); |
4b6d287f N |
691 | kunmap(bvec->bv_page); |
692 | } | |
af6d7b76 N |
693 | r1_bio->behind_pages = pages; |
694 | r1_bio->behind_page_count = bio->bi_vcnt; | |
695 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
696 | return; | |
4b6d287f N |
697 | |
698 | do_sync_io: | |
af6d7b76 N |
699 | for (i = 0; i < bio->bi_vcnt; i++) |
700 | if (pages[i]) | |
701 | put_page(pages[i]); | |
4b6d287f N |
702 | kfree(pages); |
703 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); | |
4b6d287f N |
704 | } |
705 | ||
21a52c6d | 706 | static int make_request(mddev_t *mddev, struct bio * bio) |
1da177e4 | 707 | { |
070ec55d | 708 | conf_t *conf = mddev->private; |
1da177e4 LT |
709 | mirror_info_t *mirror; |
710 | r1bio_t *r1_bio; | |
711 | struct bio *read_bio; | |
191ea9b2 | 712 | int i, targets = 0, disks; |
84255d10 | 713 | struct bitmap *bitmap; |
191ea9b2 | 714 | unsigned long flags; |
a362357b | 715 | const int rw = bio_data_dir(bio); |
2c7d46ec | 716 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 717 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
6bfe0b49 | 718 | mdk_rdev_t *blocked_rdev; |
c3b328ac | 719 | int plugged; |
191ea9b2 | 720 | |
1da177e4 LT |
721 | /* |
722 | * Register the new request and wait if the reconstruction | |
723 | * thread has put up a bar for new requests. | |
724 | * Continue immediately if no resync is active currently. | |
725 | */ | |
62de608d | 726 | |
3d310eb7 N |
727 | md_write_start(mddev, bio); /* wait on superblock update early */ |
728 | ||
6eef4b21 N |
729 | if (bio_data_dir(bio) == WRITE && |
730 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
731 | bio->bi_sector < mddev->suspend_hi) { | |
732 | /* As the suspend_* range is controlled by | |
733 | * userspace, we want an interruptible | |
734 | * wait. | |
735 | */ | |
736 | DEFINE_WAIT(w); | |
737 | for (;;) { | |
738 | flush_signals(current); | |
739 | prepare_to_wait(&conf->wait_barrier, | |
740 | &w, TASK_INTERRUPTIBLE); | |
741 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
742 | bio->bi_sector >= mddev->suspend_hi) | |
743 | break; | |
744 | schedule(); | |
745 | } | |
746 | finish_wait(&conf->wait_barrier, &w); | |
747 | } | |
62de608d | 748 | |
17999be4 | 749 | wait_barrier(conf); |
1da177e4 | 750 | |
84255d10 N |
751 | bitmap = mddev->bitmap; |
752 | ||
1da177e4 LT |
753 | /* |
754 | * make_request() can abort the operation when READA is being | |
755 | * used and no empty request is available. | |
756 | * | |
757 | */ | |
758 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
759 | ||
760 | r1_bio->master_bio = bio; | |
761 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 762 | r1_bio->state = 0; |
1da177e4 LT |
763 | r1_bio->mddev = mddev; |
764 | r1_bio->sector = bio->bi_sector; | |
765 | ||
a362357b | 766 | if (rw == READ) { |
1da177e4 LT |
767 | /* |
768 | * read balancing logic: | |
769 | */ | |
770 | int rdisk = read_balance(conf, r1_bio); | |
771 | ||
772 | if (rdisk < 0) { | |
773 | /* couldn't find anywhere to read from */ | |
774 | raid_end_bio_io(r1_bio); | |
775 | return 0; | |
776 | } | |
777 | mirror = conf->mirrors + rdisk; | |
778 | ||
e555190d N |
779 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
780 | bitmap) { | |
781 | /* Reading from a write-mostly device must | |
782 | * take care not to over-take any writes | |
783 | * that are 'behind' | |
784 | */ | |
785 | wait_event(bitmap->behind_wait, | |
786 | atomic_read(&bitmap->behind_writes) == 0); | |
787 | } | |
1da177e4 LT |
788 | r1_bio->read_disk = rdisk; |
789 | ||
a167f663 | 790 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1da177e4 LT |
791 | |
792 | r1_bio->bios[rdisk] = read_bio; | |
793 | ||
794 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
795 | read_bio->bi_bdev = mirror->rdev->bdev; | |
796 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 797 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
798 | read_bio->bi_private = r1_bio; |
799 | ||
800 | generic_make_request(read_bio); | |
801 | return 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * WRITE: | |
806 | */ | |
807 | /* first select target devices under spinlock and | |
808 | * inc refcount on their rdev. Record them by setting | |
809 | * bios[x] to bio | |
810 | */ | |
c3b328ac N |
811 | plugged = mddev_check_plugged(mddev); |
812 | ||
1da177e4 | 813 | disks = conf->raid_disks; |
6bfe0b49 DW |
814 | retry_write: |
815 | blocked_rdev = NULL; | |
1da177e4 LT |
816 | rcu_read_lock(); |
817 | for (i = 0; i < disks; i++) { | |
6bfe0b49 DW |
818 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
819 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
820 | atomic_inc(&rdev->nr_pending); | |
821 | blocked_rdev = rdev; | |
822 | break; | |
823 | } | |
824 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
1da177e4 | 825 | atomic_inc(&rdev->nr_pending); |
b2d444d7 | 826 | if (test_bit(Faulty, &rdev->flags)) { |
03c902e1 | 827 | rdev_dec_pending(rdev, mddev); |
1da177e4 | 828 | r1_bio->bios[i] = NULL; |
964147d5 | 829 | } else { |
1da177e4 | 830 | r1_bio->bios[i] = bio; |
964147d5 N |
831 | targets++; |
832 | } | |
1da177e4 LT |
833 | } else |
834 | r1_bio->bios[i] = NULL; | |
835 | } | |
836 | rcu_read_unlock(); | |
837 | ||
6bfe0b49 DW |
838 | if (unlikely(blocked_rdev)) { |
839 | /* Wait for this device to become unblocked */ | |
840 | int j; | |
841 | ||
842 | for (j = 0; j < i; j++) | |
843 | if (r1_bio->bios[j]) | |
844 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
845 | ||
846 | allow_barrier(conf); | |
847 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
848 | wait_barrier(conf); | |
849 | goto retry_write; | |
850 | } | |
851 | ||
4b6d287f N |
852 | BUG_ON(targets == 0); /* we never fail the last device */ |
853 | ||
191ea9b2 N |
854 | if (targets < conf->raid_disks) { |
855 | /* array is degraded, we will not clear the bitmap | |
856 | * on I/O completion (see raid1_end_write_request) */ | |
857 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
858 | } | |
859 | ||
e555190d N |
860 | /* do behind I/O ? |
861 | * Not if there are too many, or cannot allocate memory, | |
862 | * or a reader on WriteMostly is waiting for behind writes | |
863 | * to flush */ | |
4b6d287f | 864 | if (bitmap && |
42a04b50 N |
865 | (atomic_read(&bitmap->behind_writes) |
866 | < mddev->bitmap_info.max_write_behind) && | |
af6d7b76 N |
867 | !waitqueue_active(&bitmap->behind_wait)) |
868 | alloc_behind_pages(bio, r1_bio); | |
4b6d287f | 869 | |
4e78064f | 870 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 871 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 872 | |
4e78064f N |
873 | bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, |
874 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
1da177e4 LT |
875 | for (i = 0; i < disks; i++) { |
876 | struct bio *mbio; | |
877 | if (!r1_bio->bios[i]) | |
878 | continue; | |
879 | ||
a167f663 | 880 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1da177e4 LT |
881 | r1_bio->bios[i] = mbio; |
882 | ||
883 | mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; | |
884 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
885 | mbio->bi_end_io = raid1_end_write_request; | |
e9c7469b | 886 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; |
1da177e4 LT |
887 | mbio->bi_private = r1_bio; |
888 | ||
af6d7b76 | 889 | if (r1_bio->behind_pages) { |
4b6d287f N |
890 | struct bio_vec *bvec; |
891 | int j; | |
892 | ||
893 | /* Yes, I really want the '__' version so that | |
894 | * we clear any unused pointer in the io_vec, rather | |
895 | * than leave them unchanged. This is important | |
896 | * because when we come to free the pages, we won't | |
046abeed | 897 | * know the original bi_idx, so we just free |
4b6d287f N |
898 | * them all |
899 | */ | |
900 | __bio_for_each_segment(bvec, mbio, j, 0) | |
af6d7b76 | 901 | bvec->bv_page = r1_bio->behind_pages[j]; |
4b6d287f N |
902 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
903 | atomic_inc(&r1_bio->behind_remaining); | |
904 | } | |
905 | ||
1da177e4 | 906 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
907 | spin_lock_irqsave(&conf->device_lock, flags); |
908 | bio_list_add(&conf->pending_bio_list, mbio); | |
4e78064f | 909 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 910 | } |
af6d7b76 | 911 | r1_bio_write_done(r1_bio); |
1da177e4 | 912 | |
4e78064f | 913 | /* In case raid1d snuck in to freeze_array */ |
a35e63ef N |
914 | wake_up(&conf->wait_barrier); |
915 | ||
c3b328ac | 916 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 917 | md_wakeup_thread(mddev->thread); |
191ea9b2 | 918 | |
1da177e4 LT |
919 | return 0; |
920 | } | |
921 | ||
922 | static void status(struct seq_file *seq, mddev_t *mddev) | |
923 | { | |
070ec55d | 924 | conf_t *conf = mddev->private; |
1da177e4 LT |
925 | int i; |
926 | ||
927 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 928 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
929 | rcu_read_lock(); |
930 | for (i = 0; i < conf->raid_disks; i++) { | |
931 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 932 | seq_printf(seq, "%s", |
ddac7c7e N |
933 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
934 | } | |
935 | rcu_read_unlock(); | |
1da177e4 LT |
936 | seq_printf(seq, "]"); |
937 | } | |
938 | ||
939 | ||
940 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
941 | { | |
942 | char b[BDEVNAME_SIZE]; | |
070ec55d | 943 | conf_t *conf = mddev->private; |
1da177e4 LT |
944 | |
945 | /* | |
946 | * If it is not operational, then we have already marked it as dead | |
947 | * else if it is the last working disks, ignore the error, let the | |
948 | * next level up know. | |
949 | * else mark the drive as failed | |
950 | */ | |
b2d444d7 | 951 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 952 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
953 | /* |
954 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
955 | * normal single drive. |
956 | * However don't try a recovery from this drive as | |
957 | * it is very likely to fail. | |
1da177e4 | 958 | */ |
5389042f | 959 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 960 | return; |
4044ba58 | 961 | } |
c04be0aa N |
962 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
963 | unsigned long flags; | |
964 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 965 | mddev->degraded++; |
dd00a99e | 966 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 967 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
968 | /* |
969 | * if recovery is running, make sure it aborts. | |
970 | */ | |
dfc70645 | 971 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
972 | } else |
973 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 974 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
975 | printk(KERN_ALERT |
976 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
977 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
978 | mdname(mddev), bdevname(rdev->bdev, b), |
979 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
980 | } |
981 | ||
982 | static void print_conf(conf_t *conf) | |
983 | { | |
984 | int i; | |
1da177e4 | 985 | |
9dd1e2fa | 986 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 987 | if (!conf) { |
9dd1e2fa | 988 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
989 | return; |
990 | } | |
9dd1e2fa | 991 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
992 | conf->raid_disks); |
993 | ||
ddac7c7e | 994 | rcu_read_lock(); |
1da177e4 LT |
995 | for (i = 0; i < conf->raid_disks; i++) { |
996 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
997 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
998 | if (rdev) | |
9dd1e2fa | 999 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1000 | i, !test_bit(In_sync, &rdev->flags), |
1001 | !test_bit(Faulty, &rdev->flags), | |
1002 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1003 | } |
ddac7c7e | 1004 | rcu_read_unlock(); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | static void close_sync(conf_t *conf) | |
1008 | { | |
17999be4 N |
1009 | wait_barrier(conf); |
1010 | allow_barrier(conf); | |
1da177e4 LT |
1011 | |
1012 | mempool_destroy(conf->r1buf_pool); | |
1013 | conf->r1buf_pool = NULL; | |
1014 | } | |
1015 | ||
1016 | static int raid1_spare_active(mddev_t *mddev) | |
1017 | { | |
1018 | int i; | |
1019 | conf_t *conf = mddev->private; | |
6b965620 N |
1020 | int count = 0; |
1021 | unsigned long flags; | |
1da177e4 LT |
1022 | |
1023 | /* | |
1024 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1025 | * and mark them readable. |
1026 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1027 | */ |
1028 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1029 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1030 | if (rdev | |
1031 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1032 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1033 | count++; |
e6ffbcb6 | 1034 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
1035 | } |
1036 | } | |
6b965620 N |
1037 | spin_lock_irqsave(&conf->device_lock, flags); |
1038 | mddev->degraded -= count; | |
1039 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1040 | |
1041 | print_conf(conf); | |
6b965620 | 1042 | return count; |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | ||
1046 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1047 | { | |
1048 | conf_t *conf = mddev->private; | |
199050ea | 1049 | int err = -EEXIST; |
41158c7e | 1050 | int mirror = 0; |
1da177e4 | 1051 | mirror_info_t *p; |
6c2fce2e NB |
1052 | int first = 0; |
1053 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1054 | |
5389042f N |
1055 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1056 | return -EBUSY; | |
1057 | ||
6c2fce2e NB |
1058 | if (rdev->raid_disk >= 0) |
1059 | first = last = rdev->raid_disk; | |
1060 | ||
1061 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1062 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1063 | ||
8f6c2e4b MP |
1064 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1065 | rdev->data_offset << 9); | |
627a2d3c N |
1066 | /* as we don't honour merge_bvec_fn, we must |
1067 | * never risk violating it, so limit | |
1068 | * ->max_segments to one lying with a single | |
1069 | * page, as a one page request is never in | |
1070 | * violation. | |
1da177e4 | 1071 | */ |
627a2d3c N |
1072 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1073 | blk_queue_max_segments(mddev->queue, 1); | |
1074 | blk_queue_segment_boundary(mddev->queue, | |
1075 | PAGE_CACHE_SIZE - 1); | |
1076 | } | |
1da177e4 LT |
1077 | |
1078 | p->head_position = 0; | |
1079 | rdev->raid_disk = mirror; | |
199050ea | 1080 | err = 0; |
6aea114a N |
1081 | /* As all devices are equivalent, we don't need a full recovery |
1082 | * if this was recently any drive of the array | |
1083 | */ | |
1084 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1085 | conf->fullsync = 1; |
d6065f7b | 1086 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1087 | break; |
1088 | } | |
ac5e7113 | 1089 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1090 | print_conf(conf); |
199050ea | 1091 | return err; |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1095 | { | |
1096 | conf_t *conf = mddev->private; | |
1097 | int err = 0; | |
1098 | mdk_rdev_t *rdev; | |
1099 | mirror_info_t *p = conf->mirrors+ number; | |
1100 | ||
1101 | print_conf(conf); | |
1102 | rdev = p->rdev; | |
1103 | if (rdev) { | |
b2d444d7 | 1104 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1105 | atomic_read(&rdev->nr_pending)) { |
1106 | err = -EBUSY; | |
1107 | goto abort; | |
1108 | } | |
046abeed | 1109 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1110 | * is not possible. |
1111 | */ | |
1112 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1113 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1114 | mddev->degraded < conf->raid_disks) { |
1115 | err = -EBUSY; | |
1116 | goto abort; | |
1117 | } | |
1da177e4 | 1118 | p->rdev = NULL; |
fbd568a3 | 1119 | synchronize_rcu(); |
1da177e4 LT |
1120 | if (atomic_read(&rdev->nr_pending)) { |
1121 | /* lost the race, try later */ | |
1122 | err = -EBUSY; | |
1123 | p->rdev = rdev; | |
ac5e7113 | 1124 | goto abort; |
1da177e4 | 1125 | } |
a91a2785 | 1126 | err = md_integrity_register(mddev); |
1da177e4 LT |
1127 | } |
1128 | abort: | |
1129 | ||
1130 | print_conf(conf); | |
1131 | return err; | |
1132 | } | |
1133 | ||
1134 | ||
6712ecf8 | 1135 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1136 | { |
7b92813c | 1137 | r1bio_t *r1_bio = bio->bi_private; |
d11c171e | 1138 | int i; |
1da177e4 | 1139 | |
d11c171e N |
1140 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1141 | if (r1_bio->bios[i] == bio) | |
1142 | break; | |
1143 | BUG_ON(i < 0); | |
1144 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1145 | /* |
1146 | * we have read a block, now it needs to be re-written, | |
1147 | * or re-read if the read failed. | |
1148 | * We don't do much here, just schedule handling by raid1d | |
1149 | */ | |
69382e85 | 1150 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1151 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1152 | |
1153 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1154 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1155 | } |
1156 | ||
6712ecf8 | 1157 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1158 | { |
1159 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 1160 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 1161 | mddev_t *mddev = r1_bio->mddev; |
070ec55d | 1162 | conf_t *conf = mddev->private; |
1da177e4 LT |
1163 | int i; |
1164 | int mirror=0; | |
1165 | ||
1da177e4 LT |
1166 | for (i = 0; i < conf->raid_disks; i++) |
1167 | if (r1_bio->bios[i] == bio) { | |
1168 | mirror = i; | |
1169 | break; | |
1170 | } | |
6b1117d5 | 1171 | if (!uptodate) { |
57dab0bd | 1172 | sector_t sync_blocks = 0; |
6b1117d5 N |
1173 | sector_t s = r1_bio->sector; |
1174 | long sectors_to_go = r1_bio->sectors; | |
1175 | /* make sure these bits doesn't get cleared. */ | |
1176 | do { | |
5e3db645 | 1177 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1178 | &sync_blocks, 1); |
1179 | s += sync_blocks; | |
1180 | sectors_to_go -= sync_blocks; | |
1181 | } while (sectors_to_go > 0); | |
1da177e4 | 1182 | md_error(mddev, conf->mirrors[mirror].rdev); |
6b1117d5 | 1183 | } |
e3b9703e | 1184 | |
1da177e4 LT |
1185 | update_head_pos(mirror, r1_bio); |
1186 | ||
1187 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
73d5c38a | 1188 | sector_t s = r1_bio->sectors; |
1da177e4 | 1189 | put_buf(r1_bio); |
73d5c38a | 1190 | md_done_sync(mddev, s, uptodate); |
1da177e4 | 1191 | } |
1da177e4 LT |
1192 | } |
1193 | ||
a68e5870 | 1194 | static int fix_sync_read_error(r1bio_t *r1_bio) |
1da177e4 | 1195 | { |
a68e5870 N |
1196 | /* Try some synchronous reads of other devices to get |
1197 | * good data, much like with normal read errors. Only | |
1198 | * read into the pages we already have so we don't | |
1199 | * need to re-issue the read request. | |
1200 | * We don't need to freeze the array, because being in an | |
1201 | * active sync request, there is no normal IO, and | |
1202 | * no overlapping syncs. | |
1203 | */ | |
1204 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 1205 | conf_t *conf = mddev->private; |
a68e5870 N |
1206 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1207 | sector_t sect = r1_bio->sector; | |
1208 | int sectors = r1_bio->sectors; | |
1209 | int idx = 0; | |
1210 | ||
1211 | while(sectors) { | |
1212 | int s = sectors; | |
1213 | int d = r1_bio->read_disk; | |
1214 | int success = 0; | |
1215 | mdk_rdev_t *rdev; | |
78d7f5f7 | 1216 | int start; |
a68e5870 N |
1217 | |
1218 | if (s > (PAGE_SIZE>>9)) | |
1219 | s = PAGE_SIZE >> 9; | |
1220 | do { | |
1221 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1222 | /* No rcu protection needed here devices | |
1223 | * can only be removed when no resync is | |
1224 | * active, and resync is currently active | |
1225 | */ | |
1226 | rdev = conf->mirrors[d].rdev; | |
1227 | if (sync_page_io(rdev, | |
1228 | sect, | |
1229 | s<<9, | |
1230 | bio->bi_io_vec[idx].bv_page, | |
1231 | READ, false)) { | |
1232 | success = 1; | |
1233 | break; | |
1234 | } | |
1235 | } | |
1236 | d++; | |
1237 | if (d == conf->raid_disks) | |
1238 | d = 0; | |
1239 | } while (!success && d != r1_bio->read_disk); | |
1240 | ||
78d7f5f7 | 1241 | if (!success) { |
a68e5870 N |
1242 | char b[BDEVNAME_SIZE]; |
1243 | /* Cannot read from anywhere, array is toast */ | |
1244 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1245 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" | |
1246 | " for block %llu\n", | |
1247 | mdname(mddev), | |
1248 | bdevname(bio->bi_bdev, b), | |
1249 | (unsigned long long)r1_bio->sector); | |
1250 | md_done_sync(mddev, r1_bio->sectors, 0); | |
d11c171e | 1251 | put_buf(r1_bio); |
a68e5870 | 1252 | return 0; |
d11c171e | 1253 | } |
78d7f5f7 N |
1254 | |
1255 | start = d; | |
1256 | /* write it back and re-read */ | |
1257 | while (d != r1_bio->read_disk) { | |
1258 | if (d == 0) | |
1259 | d = conf->raid_disks; | |
1260 | d--; | |
1261 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1262 | continue; | |
1263 | rdev = conf->mirrors[d].rdev; | |
1264 | if (sync_page_io(rdev, | |
1265 | sect, | |
1266 | s<<9, | |
1267 | bio->bi_io_vec[idx].bv_page, | |
1268 | WRITE, false) == 0) { | |
1269 | r1_bio->bios[d]->bi_end_io = NULL; | |
1270 | rdev_dec_pending(rdev, mddev); | |
1271 | md_error(mddev, rdev); | |
1272 | } else | |
1273 | atomic_add(s, &rdev->corrected_errors); | |
1274 | } | |
1275 | d = start; | |
1276 | while (d != r1_bio->read_disk) { | |
1277 | if (d == 0) | |
1278 | d = conf->raid_disks; | |
1279 | d--; | |
1280 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1281 | continue; | |
1282 | rdev = conf->mirrors[d].rdev; | |
1283 | if (sync_page_io(rdev, | |
1284 | sect, | |
1285 | s<<9, | |
1286 | bio->bi_io_vec[idx].bv_page, | |
1287 | READ, false) == 0) | |
1288 | md_error(mddev, rdev); | |
1289 | } | |
a68e5870 N |
1290 | sectors -= s; |
1291 | sect += s; | |
1292 | idx ++; | |
1293 | } | |
78d7f5f7 | 1294 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1295 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1296 | return 1; |
1297 | } | |
1298 | ||
1299 | static int process_checks(r1bio_t *r1_bio) | |
1300 | { | |
1301 | /* We have read all readable devices. If we haven't | |
1302 | * got the block, then there is no hope left. | |
1303 | * If we have, then we want to do a comparison | |
1304 | * and skip the write if everything is the same. | |
1305 | * If any blocks failed to read, then we need to | |
1306 | * attempt an over-write | |
1307 | */ | |
1308 | mddev_t *mddev = r1_bio->mddev; | |
1309 | conf_t *conf = mddev->private; | |
1310 | int primary; | |
1311 | int i; | |
1312 | ||
78d7f5f7 | 1313 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1314 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1315 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1316 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1317 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1318 | break; | |
1319 | } | |
1320 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1321 | for (i = 0; i < conf->raid_disks; i++) { |
1322 | int j; | |
1323 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1324 | struct bio *pbio = r1_bio->bios[primary]; | |
1325 | struct bio *sbio = r1_bio->bios[i]; | |
1326 | int size; | |
a68e5870 | 1327 | |
78d7f5f7 N |
1328 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1329 | continue; | |
1330 | ||
1331 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1332 | for (j = vcnt; j-- ; ) { | |
1333 | struct page *p, *s; | |
1334 | p = pbio->bi_io_vec[j].bv_page; | |
1335 | s = sbio->bi_io_vec[j].bv_page; | |
1336 | if (memcmp(page_address(p), | |
1337 | page_address(s), | |
1338 | PAGE_SIZE)) | |
1339 | break; | |
69382e85 | 1340 | } |
78d7f5f7 N |
1341 | } else |
1342 | j = 0; | |
1343 | if (j >= 0) | |
1344 | mddev->resync_mismatches += r1_bio->sectors; | |
1345 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1346 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1347 | /* No need to write to this device. */ | |
1348 | sbio->bi_end_io = NULL; | |
1349 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1350 | continue; | |
1351 | } | |
1352 | /* fixup the bio for reuse */ | |
1353 | sbio->bi_vcnt = vcnt; | |
1354 | sbio->bi_size = r1_bio->sectors << 9; | |
1355 | sbio->bi_idx = 0; | |
1356 | sbio->bi_phys_segments = 0; | |
1357 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1358 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1359 | sbio->bi_next = NULL; | |
1360 | sbio->bi_sector = r1_bio->sector + | |
1361 | conf->mirrors[i].rdev->data_offset; | |
1362 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1363 | size = sbio->bi_size; | |
1364 | for (j = 0; j < vcnt ; j++) { | |
1365 | struct bio_vec *bi; | |
1366 | bi = &sbio->bi_io_vec[j]; | |
1367 | bi->bv_offset = 0; | |
1368 | if (size > PAGE_SIZE) | |
1369 | bi->bv_len = PAGE_SIZE; | |
1370 | else | |
1371 | bi->bv_len = size; | |
1372 | size -= PAGE_SIZE; | |
1373 | memcpy(page_address(bi->bv_page), | |
1374 | page_address(pbio->bi_io_vec[j].bv_page), | |
1375 | PAGE_SIZE); | |
69382e85 | 1376 | } |
78d7f5f7 | 1377 | } |
a68e5870 N |
1378 | return 0; |
1379 | } | |
1380 | ||
1381 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1382 | { | |
1383 | conf_t *conf = mddev->private; | |
1384 | int i; | |
1385 | int disks = conf->raid_disks; | |
1386 | struct bio *bio, *wbio; | |
1387 | ||
1388 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1389 | ||
a68e5870 N |
1390 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1391 | /* ouch - failed to read all of that. */ | |
1392 | if (!fix_sync_read_error(r1_bio)) | |
1393 | return; | |
7ca78d57 N |
1394 | |
1395 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1396 | if (process_checks(r1_bio) < 0) | |
1397 | return; | |
d11c171e N |
1398 | /* |
1399 | * schedule writes | |
1400 | */ | |
1da177e4 LT |
1401 | atomic_set(&r1_bio->remaining, 1); |
1402 | for (i = 0; i < disks ; i++) { | |
1403 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1404 | if (wbio->bi_end_io == NULL || |
1405 | (wbio->bi_end_io == end_sync_read && | |
1406 | (i == r1_bio->read_disk || | |
1407 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1408 | continue; |
1409 | ||
3e198f78 N |
1410 | wbio->bi_rw = WRITE; |
1411 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1412 | atomic_inc(&r1_bio->remaining); |
1413 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1414 | |
1da177e4 LT |
1415 | generic_make_request(wbio); |
1416 | } | |
1417 | ||
1418 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1419 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1420 | md_done_sync(mddev, r1_bio->sectors, 1); |
1421 | put_buf(r1_bio); | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * This is a kernel thread which: | |
1427 | * | |
1428 | * 1. Retries failed read operations on working mirrors. | |
1429 | * 2. Updates the raid superblock when problems encounter. | |
1430 | * 3. Performs writes following reads for array syncronising. | |
1431 | */ | |
1432 | ||
867868fb N |
1433 | static void fix_read_error(conf_t *conf, int read_disk, |
1434 | sector_t sect, int sectors) | |
1435 | { | |
1436 | mddev_t *mddev = conf->mddev; | |
1437 | while(sectors) { | |
1438 | int s = sectors; | |
1439 | int d = read_disk; | |
1440 | int success = 0; | |
1441 | int start; | |
1442 | mdk_rdev_t *rdev; | |
1443 | ||
1444 | if (s > (PAGE_SIZE>>9)) | |
1445 | s = PAGE_SIZE >> 9; | |
1446 | ||
1447 | do { | |
1448 | /* Note: no rcu protection needed here | |
1449 | * as this is synchronous in the raid1d thread | |
1450 | * which is the thread that might remove | |
1451 | * a device. If raid1d ever becomes multi-threaded.... | |
1452 | */ | |
1453 | rdev = conf->mirrors[d].rdev; | |
1454 | if (rdev && | |
1455 | test_bit(In_sync, &rdev->flags) && | |
ccebd4c4 JB |
1456 | sync_page_io(rdev, sect, s<<9, |
1457 | conf->tmppage, READ, false)) | |
867868fb N |
1458 | success = 1; |
1459 | else { | |
1460 | d++; | |
1461 | if (d == conf->raid_disks) | |
1462 | d = 0; | |
1463 | } | |
1464 | } while (!success && d != read_disk); | |
1465 | ||
1466 | if (!success) { | |
1467 | /* Cannot read from anywhere -- bye bye array */ | |
1468 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1469 | break; | |
1470 | } | |
1471 | /* write it back and re-read */ | |
1472 | start = d; | |
1473 | while (d != read_disk) { | |
1474 | if (d==0) | |
1475 | d = conf->raid_disks; | |
1476 | d--; | |
1477 | rdev = conf->mirrors[d].rdev; | |
1478 | if (rdev && | |
1479 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1480 | if (sync_page_io(rdev, sect, s<<9, |
1481 | conf->tmppage, WRITE, false) | |
867868fb N |
1482 | == 0) |
1483 | /* Well, this device is dead */ | |
1484 | md_error(mddev, rdev); | |
1485 | } | |
1486 | } | |
1487 | d = start; | |
1488 | while (d != read_disk) { | |
1489 | char b[BDEVNAME_SIZE]; | |
1490 | if (d==0) | |
1491 | d = conf->raid_disks; | |
1492 | d--; | |
1493 | rdev = conf->mirrors[d].rdev; | |
1494 | if (rdev && | |
1495 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1496 | if (sync_page_io(rdev, sect, s<<9, |
1497 | conf->tmppage, READ, false) | |
867868fb N |
1498 | == 0) |
1499 | /* Well, this device is dead */ | |
1500 | md_error(mddev, rdev); | |
1501 | else { | |
1502 | atomic_add(s, &rdev->corrected_errors); | |
1503 | printk(KERN_INFO | |
9dd1e2fa | 1504 | "md/raid1:%s: read error corrected " |
867868fb N |
1505 | "(%d sectors at %llu on %s)\n", |
1506 | mdname(mddev), s, | |
969b755a RD |
1507 | (unsigned long long)(sect + |
1508 | rdev->data_offset), | |
867868fb N |
1509 | bdevname(rdev->bdev, b)); |
1510 | } | |
1511 | } | |
1512 | } | |
1513 | sectors -= s; | |
1514 | sect += s; | |
1515 | } | |
1516 | } | |
1517 | ||
1da177e4 LT |
1518 | static void raid1d(mddev_t *mddev) |
1519 | { | |
1520 | r1bio_t *r1_bio; | |
1521 | struct bio *bio; | |
1522 | unsigned long flags; | |
070ec55d | 1523 | conf_t *conf = mddev->private; |
1da177e4 | 1524 | struct list_head *head = &conf->retry_list; |
1da177e4 | 1525 | mdk_rdev_t *rdev; |
e1dfa0a2 | 1526 | struct blk_plug plug; |
1da177e4 LT |
1527 | |
1528 | md_check_recovery(mddev); | |
e1dfa0a2 N |
1529 | |
1530 | blk_start_plug(&plug); | |
1da177e4 LT |
1531 | for (;;) { |
1532 | char b[BDEVNAME_SIZE]; | |
191ea9b2 | 1533 | |
c3b328ac N |
1534 | if (atomic_read(&mddev->plug_cnt) == 0) |
1535 | flush_pending_writes(conf); | |
191ea9b2 | 1536 | |
a35e63ef N |
1537 | spin_lock_irqsave(&conf->device_lock, flags); |
1538 | if (list_empty(head)) { | |
1539 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 1540 | break; |
a35e63ef | 1541 | } |
1da177e4 LT |
1542 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
1543 | list_del(head->prev); | |
ddaf22ab | 1544 | conf->nr_queued--; |
1da177e4 LT |
1545 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1546 | ||
1547 | mddev = r1_bio->mddev; | |
070ec55d | 1548 | conf = mddev->private; |
7eaceacc | 1549 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) |
1da177e4 | 1550 | sync_request_write(mddev, r1_bio); |
7eaceacc | 1551 | else { |
1da177e4 | 1552 | int disk; |
ddaf22ab N |
1553 | |
1554 | /* we got a read error. Maybe the drive is bad. Maybe just | |
1555 | * the block and we can fix it. | |
1556 | * We freeze all other IO, and try reading the block from | |
1557 | * other devices. When we find one, we re-write | |
1558 | * and check it that fixes the read error. | |
1559 | * This is all done synchronously while the array is | |
1560 | * frozen | |
1561 | */ | |
867868fb N |
1562 | if (mddev->ro == 0) { |
1563 | freeze_array(conf); | |
1564 | fix_read_error(conf, r1_bio->read_disk, | |
1565 | r1_bio->sector, | |
1566 | r1_bio->sectors); | |
1567 | unfreeze_array(conf); | |
d0e26078 N |
1568 | } else |
1569 | md_error(mddev, | |
1570 | conf->mirrors[r1_bio->read_disk].rdev); | |
ddaf22ab | 1571 | |
1da177e4 | 1572 | bio = r1_bio->bios[r1_bio->read_disk]; |
d0e26078 | 1573 | if ((disk=read_balance(conf, r1_bio)) == -1) { |
9dd1e2fa | 1574 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" |
1da177e4 | 1575 | " read error for block %llu\n", |
9dd1e2fa | 1576 | mdname(mddev), |
1da177e4 LT |
1577 | bdevname(bio->bi_bdev,b), |
1578 | (unsigned long long)r1_bio->sector); | |
1579 | raid_end_bio_io(r1_bio); | |
1580 | } else { | |
2c7d46ec | 1581 | const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC; |
cf30a473 N |
1582 | r1_bio->bios[r1_bio->read_disk] = |
1583 | mddev->ro ? IO_BLOCKED : NULL; | |
1da177e4 LT |
1584 | r1_bio->read_disk = disk; |
1585 | bio_put(bio); | |
a167f663 N |
1586 | bio = bio_clone_mddev(r1_bio->master_bio, |
1587 | GFP_NOIO, mddev); | |
1da177e4 LT |
1588 | r1_bio->bios[r1_bio->read_disk] = bio; |
1589 | rdev = conf->mirrors[disk].rdev; | |
8bda470e CD |
1590 | printk_ratelimited( |
1591 | KERN_ERR | |
1592 | "md/raid1:%s: redirecting sector %llu" | |
1593 | " to other mirror: %s\n", | |
1594 | mdname(mddev), | |
1595 | (unsigned long long)r1_bio->sector, | |
1596 | bdevname(rdev->bdev, b)); | |
1da177e4 LT |
1597 | bio->bi_sector = r1_bio->sector + rdev->data_offset; |
1598 | bio->bi_bdev = rdev->bdev; | |
1599 | bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1600 | bio->bi_rw = READ | do_sync; |
1da177e4 | 1601 | bio->bi_private = r1_bio; |
1da177e4 LT |
1602 | generic_make_request(bio); |
1603 | } | |
1604 | } | |
1d9d5241 | 1605 | cond_resched(); |
1da177e4 | 1606 | } |
e1dfa0a2 | 1607 | blk_finish_plug(&plug); |
1da177e4 LT |
1608 | } |
1609 | ||
1610 | ||
1611 | static int init_resync(conf_t *conf) | |
1612 | { | |
1613 | int buffs; | |
1614 | ||
1615 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 1616 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
1617 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
1618 | conf->poolinfo); | |
1619 | if (!conf->r1buf_pool) | |
1620 | return -ENOMEM; | |
1621 | conf->next_resync = 0; | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * perform a "sync" on one "block" | |
1627 | * | |
1628 | * We need to make sure that no normal I/O request - particularly write | |
1629 | * requests - conflict with active sync requests. | |
1630 | * | |
1631 | * This is achieved by tracking pending requests and a 'barrier' concept | |
1632 | * that can be installed to exclude normal IO requests. | |
1633 | */ | |
1634 | ||
57afd89f | 1635 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 1636 | { |
070ec55d | 1637 | conf_t *conf = mddev->private; |
1da177e4 LT |
1638 | r1bio_t *r1_bio; |
1639 | struct bio *bio; | |
1640 | sector_t max_sector, nr_sectors; | |
3e198f78 | 1641 | int disk = -1; |
1da177e4 | 1642 | int i; |
3e198f78 N |
1643 | int wonly = -1; |
1644 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 1645 | sector_t sync_blocks; |
e3b9703e | 1646 | int still_degraded = 0; |
1da177e4 LT |
1647 | |
1648 | if (!conf->r1buf_pool) | |
1649 | if (init_resync(conf)) | |
57afd89f | 1650 | return 0; |
1da177e4 | 1651 | |
58c0fed4 | 1652 | max_sector = mddev->dev_sectors; |
1da177e4 | 1653 | if (sector_nr >= max_sector) { |
191ea9b2 N |
1654 | /* If we aborted, we need to abort the |
1655 | * sync on the 'current' bitmap chunk (there will | |
1656 | * only be one in raid1 resync. | |
1657 | * We can find the current addess in mddev->curr_resync | |
1658 | */ | |
6a806c51 N |
1659 | if (mddev->curr_resync < max_sector) /* aborted */ |
1660 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 1661 | &sync_blocks, 1); |
6a806c51 | 1662 | else /* completed sync */ |
191ea9b2 | 1663 | conf->fullsync = 0; |
6a806c51 N |
1664 | |
1665 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
1666 | close_sync(conf); |
1667 | return 0; | |
1668 | } | |
1669 | ||
07d84d10 N |
1670 | if (mddev->bitmap == NULL && |
1671 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 1672 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
1673 | conf->fullsync == 0) { |
1674 | *skipped = 1; | |
1675 | return max_sector - sector_nr; | |
1676 | } | |
6394cca5 N |
1677 | /* before building a request, check if we can skip these blocks.. |
1678 | * This call the bitmap_start_sync doesn't actually record anything | |
1679 | */ | |
e3b9703e | 1680 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 1681 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
1682 | /* We can skip this block, and probably several more */ |
1683 | *skipped = 1; | |
1684 | return sync_blocks; | |
1685 | } | |
1da177e4 | 1686 | /* |
17999be4 N |
1687 | * If there is non-resync activity waiting for a turn, |
1688 | * and resync is going fast enough, | |
1689 | * then let it though before starting on this new sync request. | |
1da177e4 | 1690 | */ |
17999be4 | 1691 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 1692 | msleep_interruptible(1000); |
17999be4 | 1693 | |
b47490c9 | 1694 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 1695 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
1696 | raise_barrier(conf); |
1697 | ||
1698 | conf->next_resync = sector_nr; | |
1da177e4 | 1699 | |
3e198f78 | 1700 | rcu_read_lock(); |
1da177e4 | 1701 | /* |
3e198f78 N |
1702 | * If we get a correctably read error during resync or recovery, |
1703 | * we might want to read from a different device. So we | |
1704 | * flag all drives that could conceivably be read from for READ, | |
1705 | * and any others (which will be non-In_sync devices) for WRITE. | |
1706 | * If a read fails, we try reading from something else for which READ | |
1707 | * is OK. | |
1da177e4 | 1708 | */ |
1da177e4 | 1709 | |
1da177e4 LT |
1710 | r1_bio->mddev = mddev; |
1711 | r1_bio->sector = sector_nr; | |
191ea9b2 | 1712 | r1_bio->state = 0; |
1da177e4 | 1713 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
1714 | |
1715 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 1716 | mdk_rdev_t *rdev; |
1da177e4 LT |
1717 | bio = r1_bio->bios[i]; |
1718 | ||
1719 | /* take from bio_init */ | |
1720 | bio->bi_next = NULL; | |
db8d9d35 | 1721 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 1722 | bio->bi_flags |= 1 << BIO_UPTODATE; |
db8d9d35 | 1723 | bio->bi_comp_cpu = -1; |
802ba064 | 1724 | bio->bi_rw = READ; |
1da177e4 LT |
1725 | bio->bi_vcnt = 0; |
1726 | bio->bi_idx = 0; | |
1727 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
1728 | bio->bi_size = 0; |
1729 | bio->bi_end_io = NULL; | |
1730 | bio->bi_private = NULL; | |
1731 | ||
3e198f78 N |
1732 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
1733 | if (rdev == NULL || | |
1734 | test_bit(Faulty, &rdev->flags)) { | |
e3b9703e N |
1735 | still_degraded = 1; |
1736 | continue; | |
3e198f78 | 1737 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
1738 | bio->bi_rw = WRITE; |
1739 | bio->bi_end_io = end_sync_write; | |
1740 | write_targets ++; | |
3e198f78 N |
1741 | } else { |
1742 | /* may need to read from here */ | |
1743 | bio->bi_rw = READ; | |
1744 | bio->bi_end_io = end_sync_read; | |
1745 | if (test_bit(WriteMostly, &rdev->flags)) { | |
1746 | if (wonly < 0) | |
1747 | wonly = i; | |
1748 | } else { | |
1749 | if (disk < 0) | |
1750 | disk = i; | |
1751 | } | |
1752 | read_targets++; | |
1753 | } | |
1754 | atomic_inc(&rdev->nr_pending); | |
1755 | bio->bi_sector = sector_nr + rdev->data_offset; | |
1756 | bio->bi_bdev = rdev->bdev; | |
1da177e4 LT |
1757 | bio->bi_private = r1_bio; |
1758 | } | |
3e198f78 N |
1759 | rcu_read_unlock(); |
1760 | if (disk < 0) | |
1761 | disk = wonly; | |
1762 | r1_bio->read_disk = disk; | |
191ea9b2 | 1763 | |
3e198f78 N |
1764 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
1765 | /* extra read targets are also write targets */ | |
1766 | write_targets += read_targets-1; | |
1767 | ||
1768 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
1769 | /* There is nowhere to write, so all non-sync |
1770 | * drives must be failed - so we are finished | |
1771 | */ | |
57afd89f N |
1772 | sector_t rv = max_sector - sector_nr; |
1773 | *skipped = 1; | |
1da177e4 | 1774 | put_buf(r1_bio); |
1da177e4 LT |
1775 | return rv; |
1776 | } | |
1777 | ||
c6207277 N |
1778 | if (max_sector > mddev->resync_max) |
1779 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
1da177e4 | 1780 | nr_sectors = 0; |
289e99e8 | 1781 | sync_blocks = 0; |
1da177e4 LT |
1782 | do { |
1783 | struct page *page; | |
1784 | int len = PAGE_SIZE; | |
1785 | if (sector_nr + (len>>9) > max_sector) | |
1786 | len = (max_sector - sector_nr) << 9; | |
1787 | if (len == 0) | |
1788 | break; | |
6a806c51 N |
1789 | if (sync_blocks == 0) { |
1790 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
1791 | &sync_blocks, still_degraded) && |
1792 | !conf->fullsync && | |
1793 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 1794 | break; |
9e77c485 | 1795 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 1796 | if ((len >> 9) > sync_blocks) |
6a806c51 | 1797 | len = sync_blocks<<9; |
ab7a30c7 | 1798 | } |
191ea9b2 | 1799 | |
1da177e4 LT |
1800 | for (i=0 ; i < conf->raid_disks; i++) { |
1801 | bio = r1_bio->bios[i]; | |
1802 | if (bio->bi_end_io) { | |
d11c171e | 1803 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
1804 | if (bio_add_page(bio, page, len, 0) == 0) { |
1805 | /* stop here */ | |
d11c171e | 1806 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
1807 | while (i > 0) { |
1808 | i--; | |
1809 | bio = r1_bio->bios[i]; | |
6a806c51 N |
1810 | if (bio->bi_end_io==NULL) |
1811 | continue; | |
1da177e4 LT |
1812 | /* remove last page from this bio */ |
1813 | bio->bi_vcnt--; | |
1814 | bio->bi_size -= len; | |
1815 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
1816 | } | |
1817 | goto bio_full; | |
1818 | } | |
1819 | } | |
1820 | } | |
1821 | nr_sectors += len>>9; | |
1822 | sector_nr += len>>9; | |
191ea9b2 | 1823 | sync_blocks -= (len>>9); |
1da177e4 LT |
1824 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
1825 | bio_full: | |
1da177e4 LT |
1826 | r1_bio->sectors = nr_sectors; |
1827 | ||
d11c171e N |
1828 | /* For a user-requested sync, we read all readable devices and do a |
1829 | * compare | |
1830 | */ | |
1831 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1832 | atomic_set(&r1_bio->remaining, read_targets); | |
1833 | for (i=0; i<conf->raid_disks; i++) { | |
1834 | bio = r1_bio->bios[i]; | |
1835 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 1836 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
1837 | generic_make_request(bio); |
1838 | } | |
1839 | } | |
1840 | } else { | |
1841 | atomic_set(&r1_bio->remaining, 1); | |
1842 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 1843 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 1844 | generic_make_request(bio); |
1da177e4 | 1845 | |
d11c171e | 1846 | } |
1da177e4 LT |
1847 | return nr_sectors; |
1848 | } | |
1849 | ||
80c3a6ce DW |
1850 | static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) |
1851 | { | |
1852 | if (sectors) | |
1853 | return sectors; | |
1854 | ||
1855 | return mddev->dev_sectors; | |
1856 | } | |
1857 | ||
709ae487 | 1858 | static conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
1859 | { |
1860 | conf_t *conf; | |
709ae487 | 1861 | int i; |
1da177e4 LT |
1862 | mirror_info_t *disk; |
1863 | mdk_rdev_t *rdev; | |
709ae487 | 1864 | int err = -ENOMEM; |
1da177e4 | 1865 | |
9ffae0cf | 1866 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 | 1867 | if (!conf) |
709ae487 | 1868 | goto abort; |
1da177e4 | 1869 | |
9ffae0cf | 1870 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
1871 | GFP_KERNEL); |
1872 | if (!conf->mirrors) | |
709ae487 | 1873 | goto abort; |
1da177e4 | 1874 | |
ddaf22ab N |
1875 | conf->tmppage = alloc_page(GFP_KERNEL); |
1876 | if (!conf->tmppage) | |
709ae487 | 1877 | goto abort; |
ddaf22ab | 1878 | |
709ae487 | 1879 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 1880 | if (!conf->poolinfo) |
709ae487 | 1881 | goto abort; |
1da177e4 LT |
1882 | conf->poolinfo->raid_disks = mddev->raid_disks; |
1883 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
1884 | r1bio_pool_free, | |
1885 | conf->poolinfo); | |
1886 | if (!conf->r1bio_pool) | |
709ae487 N |
1887 | goto abort; |
1888 | ||
ed9bfdf1 | 1889 | conf->poolinfo->mddev = mddev; |
1da177e4 | 1890 | |
e7e72bf6 | 1891 | spin_lock_init(&conf->device_lock); |
159ec1fc | 1892 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 1893 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
1894 | if (disk_idx >= mddev->raid_disks |
1895 | || disk_idx < 0) | |
1896 | continue; | |
1897 | disk = conf->mirrors + disk_idx; | |
1898 | ||
1899 | disk->rdev = rdev; | |
1da177e4 LT |
1900 | |
1901 | disk->head_position = 0; | |
1da177e4 LT |
1902 | } |
1903 | conf->raid_disks = mddev->raid_disks; | |
1904 | conf->mddev = mddev; | |
1da177e4 | 1905 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
1906 | |
1907 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 1908 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 1909 | |
191ea9b2 | 1910 | bio_list_init(&conf->pending_bio_list); |
191ea9b2 | 1911 | |
709ae487 | 1912 | conf->last_used = -1; |
1da177e4 LT |
1913 | for (i = 0; i < conf->raid_disks; i++) { |
1914 | ||
1915 | disk = conf->mirrors + i; | |
1916 | ||
5fd6c1dc N |
1917 | if (!disk->rdev || |
1918 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 1919 | disk->head_position = 0; |
918f0238 N |
1920 | if (disk->rdev) |
1921 | conf->fullsync = 1; | |
709ae487 N |
1922 | } else if (conf->last_used < 0) |
1923 | /* | |
1924 | * The first working device is used as a | |
1925 | * starting point to read balancing. | |
1926 | */ | |
1927 | conf->last_used = i; | |
1da177e4 | 1928 | } |
709ae487 N |
1929 | |
1930 | err = -EIO; | |
1931 | if (conf->last_used < 0) { | |
9dd1e2fa | 1932 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
1933 | mdname(mddev)); |
1934 | goto abort; | |
1935 | } | |
1936 | err = -ENOMEM; | |
1937 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
1938 | if (!conf->thread) { | |
1939 | printk(KERN_ERR | |
9dd1e2fa | 1940 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
1941 | mdname(mddev)); |
1942 | goto abort; | |
11ce99e6 | 1943 | } |
1da177e4 | 1944 | |
709ae487 N |
1945 | return conf; |
1946 | ||
1947 | abort: | |
1948 | if (conf) { | |
1949 | if (conf->r1bio_pool) | |
1950 | mempool_destroy(conf->r1bio_pool); | |
1951 | kfree(conf->mirrors); | |
1952 | safe_put_page(conf->tmppage); | |
1953 | kfree(conf->poolinfo); | |
1954 | kfree(conf); | |
1955 | } | |
1956 | return ERR_PTR(err); | |
1957 | } | |
1958 | ||
1959 | static int run(mddev_t *mddev) | |
1960 | { | |
1961 | conf_t *conf; | |
1962 | int i; | |
1963 | mdk_rdev_t *rdev; | |
1964 | ||
1965 | if (mddev->level != 1) { | |
9dd1e2fa | 1966 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
1967 | mdname(mddev), mddev->level); |
1968 | return -EIO; | |
1969 | } | |
1970 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 1971 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
1972 | mdname(mddev)); |
1973 | return -EIO; | |
1974 | } | |
1da177e4 | 1975 | /* |
709ae487 N |
1976 | * copy the already verified devices into our private RAID1 |
1977 | * bookkeeping area. [whatever we allocate in run(), | |
1978 | * should be freed in stop()] | |
1da177e4 | 1979 | */ |
709ae487 N |
1980 | if (mddev->private == NULL) |
1981 | conf = setup_conf(mddev); | |
1982 | else | |
1983 | conf = mddev->private; | |
1da177e4 | 1984 | |
709ae487 N |
1985 | if (IS_ERR(conf)) |
1986 | return PTR_ERR(conf); | |
1da177e4 | 1987 | |
709ae487 | 1988 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1ed7242e JB |
1989 | if (!mddev->gendisk) |
1990 | continue; | |
709ae487 N |
1991 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1992 | rdev->data_offset << 9); | |
1993 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
1994 | * violating it, so limit ->max_segments to 1 lying within |
1995 | * a single page, as a one page request is never in violation. | |
709ae487 | 1996 | */ |
627a2d3c N |
1997 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1998 | blk_queue_max_segments(mddev->queue, 1); | |
1999 | blk_queue_segment_boundary(mddev->queue, | |
2000 | PAGE_CACHE_SIZE - 1); | |
2001 | } | |
1da177e4 | 2002 | } |
191ea9b2 | 2003 | |
709ae487 N |
2004 | mddev->degraded = 0; |
2005 | for (i=0; i < conf->raid_disks; i++) | |
2006 | if (conf->mirrors[i].rdev == NULL || | |
2007 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2008 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2009 | mddev->degraded++; | |
2010 | ||
2011 | if (conf->raid_disks - mddev->degraded == 1) | |
2012 | mddev->recovery_cp = MaxSector; | |
2013 | ||
8c6ac868 | 2014 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2015 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2016 | " -- starting background reconstruction\n", |
2017 | mdname(mddev)); | |
1da177e4 | 2018 | printk(KERN_INFO |
9dd1e2fa | 2019 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2020 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2021 | mddev->raid_disks); | |
709ae487 | 2022 | |
1da177e4 LT |
2023 | /* |
2024 | * Ok, everything is just fine now | |
2025 | */ | |
709ae487 N |
2026 | mddev->thread = conf->thread; |
2027 | conf->thread = NULL; | |
2028 | mddev->private = conf; | |
2029 | ||
1f403624 | 2030 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2031 | |
1ed7242e JB |
2032 | if (mddev->queue) { |
2033 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2034 | mddev->queue->backing_dev_info.congested_data = mddev; | |
2035 | } | |
a91a2785 | 2036 | return md_integrity_register(mddev); |
1da177e4 LT |
2037 | } |
2038 | ||
2039 | static int stop(mddev_t *mddev) | |
2040 | { | |
070ec55d | 2041 | conf_t *conf = mddev->private; |
4b6d287f | 2042 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2043 | |
2044 | /* wait for behind writes to complete */ | |
e555190d | 2045 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2046 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2047 | mdname(mddev)); | |
4b6d287f | 2048 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2049 | wait_event(bitmap->behind_wait, |
2050 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2051 | } |
1da177e4 | 2052 | |
409c57f3 N |
2053 | raise_barrier(conf); |
2054 | lower_barrier(conf); | |
2055 | ||
1da177e4 LT |
2056 | md_unregister_thread(mddev->thread); |
2057 | mddev->thread = NULL; | |
1da177e4 LT |
2058 | if (conf->r1bio_pool) |
2059 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2060 | kfree(conf->mirrors); |
2061 | kfree(conf->poolinfo); | |
1da177e4 LT |
2062 | kfree(conf); |
2063 | mddev->private = NULL; | |
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2068 | { | |
2069 | /* no resync is happening, and there is enough space | |
2070 | * on all devices, so we can resize. | |
2071 | * We need to make sure resync covers any new space. | |
2072 | * If the array is shrinking we should possibly wait until | |
2073 | * any io in the removed space completes, but it hardly seems | |
2074 | * worth it. | |
2075 | */ | |
1f403624 | 2076 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2077 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2078 | return -EINVAL; | |
f233ea5c | 2079 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2080 | revalidate_disk(mddev->gendisk); |
b522adcd | 2081 | if (sectors > mddev->dev_sectors && |
b098636c | 2082 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2083 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2084 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2085 | } | |
b522adcd | 2086 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2087 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2088 | return 0; |
2089 | } | |
2090 | ||
63c70c4f | 2091 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2092 | { |
2093 | /* We need to: | |
2094 | * 1/ resize the r1bio_pool | |
2095 | * 2/ resize conf->mirrors | |
2096 | * | |
2097 | * We allocate a new r1bio_pool if we can. | |
2098 | * Then raise a device barrier and wait until all IO stops. | |
2099 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2100 | * |
2101 | * At the same time, we "pack" the devices so that all the missing | |
2102 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2103 | */ |
2104 | mempool_t *newpool, *oldpool; | |
2105 | struct pool_info *newpoolinfo; | |
2106 | mirror_info_t *newmirrors; | |
070ec55d | 2107 | conf_t *conf = mddev->private; |
63c70c4f | 2108 | int cnt, raid_disks; |
c04be0aa | 2109 | unsigned long flags; |
b5470dc5 | 2110 | int d, d2, err; |
1da177e4 | 2111 | |
63c70c4f | 2112 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2113 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2114 | mddev->layout != mddev->new_layout || |
2115 | mddev->level != mddev->new_level) { | |
664e7c41 | 2116 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2117 | mddev->new_layout = mddev->layout; |
2118 | mddev->new_level = mddev->level; | |
2119 | return -EINVAL; | |
2120 | } | |
2121 | ||
b5470dc5 DW |
2122 | err = md_allow_write(mddev); |
2123 | if (err) | |
2124 | return err; | |
2a2275d6 | 2125 | |
63c70c4f N |
2126 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2127 | ||
6ea9c07c N |
2128 | if (raid_disks < conf->raid_disks) { |
2129 | cnt=0; | |
2130 | for (d= 0; d < conf->raid_disks; d++) | |
2131 | if (conf->mirrors[d].rdev) | |
2132 | cnt++; | |
2133 | if (cnt > raid_disks) | |
1da177e4 | 2134 | return -EBUSY; |
6ea9c07c | 2135 | } |
1da177e4 LT |
2136 | |
2137 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2138 | if (!newpoolinfo) | |
2139 | return -ENOMEM; | |
2140 | newpoolinfo->mddev = mddev; | |
2141 | newpoolinfo->raid_disks = raid_disks; | |
2142 | ||
2143 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2144 | r1bio_pool_free, newpoolinfo); | |
2145 | if (!newpool) { | |
2146 | kfree(newpoolinfo); | |
2147 | return -ENOMEM; | |
2148 | } | |
9ffae0cf | 2149 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2150 | if (!newmirrors) { |
2151 | kfree(newpoolinfo); | |
2152 | mempool_destroy(newpool); | |
2153 | return -ENOMEM; | |
2154 | } | |
1da177e4 | 2155 | |
17999be4 | 2156 | raise_barrier(conf); |
1da177e4 LT |
2157 | |
2158 | /* ok, everything is stopped */ | |
2159 | oldpool = conf->r1bio_pool; | |
2160 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2161 | |
a88aa786 N |
2162 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2163 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2164 | if (rdev && rdev->raid_disk != d2) { | |
36fad858 | 2165 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2166 | rdev->raid_disk = d2; |
36fad858 NK |
2167 | sysfs_unlink_rdev(mddev, rdev); |
2168 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2169 | printk(KERN_WARNING |
36fad858 NK |
2170 | "md/raid1:%s: cannot register rd%d\n", |
2171 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2172 | } |
a88aa786 N |
2173 | if (rdev) |
2174 | newmirrors[d2++].rdev = rdev; | |
2175 | } | |
1da177e4 LT |
2176 | kfree(conf->mirrors); |
2177 | conf->mirrors = newmirrors; | |
2178 | kfree(conf->poolinfo); | |
2179 | conf->poolinfo = newpoolinfo; | |
2180 | ||
c04be0aa | 2181 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2182 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2183 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2184 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2185 | mddev->delta_disks = 0; |
1da177e4 | 2186 | |
6ea9c07c | 2187 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2188 | lower_barrier(conf); |
1da177e4 LT |
2189 | |
2190 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2191 | md_wakeup_thread(mddev->thread); | |
2192 | ||
2193 | mempool_destroy(oldpool); | |
2194 | return 0; | |
2195 | } | |
2196 | ||
500af87a | 2197 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 | 2198 | { |
070ec55d | 2199 | conf_t *conf = mddev->private; |
36fa3063 N |
2200 | |
2201 | switch(state) { | |
6eef4b21 N |
2202 | case 2: /* wake for suspend */ |
2203 | wake_up(&conf->wait_barrier); | |
2204 | break; | |
9e6603da | 2205 | case 1: |
17999be4 | 2206 | raise_barrier(conf); |
36fa3063 | 2207 | break; |
9e6603da | 2208 | case 0: |
17999be4 | 2209 | lower_barrier(conf); |
36fa3063 N |
2210 | break; |
2211 | } | |
36fa3063 N |
2212 | } |
2213 | ||
709ae487 N |
2214 | static void *raid1_takeover(mddev_t *mddev) |
2215 | { | |
2216 | /* raid1 can take over: | |
2217 | * raid5 with 2 devices, any layout or chunk size | |
2218 | */ | |
2219 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
2220 | conf_t *conf; | |
2221 | mddev->new_level = 1; | |
2222 | mddev->new_layout = 0; | |
2223 | mddev->new_chunk_sectors = 0; | |
2224 | conf = setup_conf(mddev); | |
2225 | if (!IS_ERR(conf)) | |
2226 | conf->barrier = 1; | |
2227 | return conf; | |
2228 | } | |
2229 | return ERR_PTR(-EINVAL); | |
2230 | } | |
1da177e4 | 2231 | |
2604b703 | 2232 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2233 | { |
2234 | .name = "raid1", | |
2604b703 | 2235 | .level = 1, |
1da177e4 LT |
2236 | .owner = THIS_MODULE, |
2237 | .make_request = make_request, | |
2238 | .run = run, | |
2239 | .stop = stop, | |
2240 | .status = status, | |
2241 | .error_handler = error, | |
2242 | .hot_add_disk = raid1_add_disk, | |
2243 | .hot_remove_disk= raid1_remove_disk, | |
2244 | .spare_active = raid1_spare_active, | |
2245 | .sync_request = sync_request, | |
2246 | .resize = raid1_resize, | |
80c3a6ce | 2247 | .size = raid1_size, |
63c70c4f | 2248 | .check_reshape = raid1_reshape, |
36fa3063 | 2249 | .quiesce = raid1_quiesce, |
709ae487 | 2250 | .takeover = raid1_takeover, |
1da177e4 LT |
2251 | }; |
2252 | ||
2253 | static int __init raid_init(void) | |
2254 | { | |
2604b703 | 2255 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2256 | } |
2257 | ||
2258 | static void raid_exit(void) | |
2259 | { | |
2604b703 | 2260 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2261 | } |
2262 | ||
2263 | module_init(raid_init); | |
2264 | module_exit(raid_exit); | |
2265 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2266 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2267 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2268 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2269 | MODULE_ALIAS("md-level-1"); |