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 | |
d2eb35ac | 44 | #define PRINTK(x...) do { if (DEBUG) printk(x); } while (0) |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Number of guaranteed r1bios in case of extreme VM load: | |
48 | */ | |
49 | #define NR_RAID1_BIOS 256 | |
50 | ||
1da177e4 | 51 | |
17999be4 N |
52 | static void allow_barrier(conf_t *conf); |
53 | static void lower_barrier(conf_t *conf); | |
1da177e4 | 54 | |
dd0fc66f | 55 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
56 | { |
57 | struct pool_info *pi = data; | |
1da177e4 LT |
58 | int size = offsetof(r1bio_t, bios[pi->raid_disks]); |
59 | ||
60 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 61 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
62 | } |
63 | ||
64 | static void r1bio_pool_free(void *r1_bio, void *data) | |
65 | { | |
66 | kfree(r1_bio); | |
67 | } | |
68 | ||
69 | #define RESYNC_BLOCK_SIZE (64*1024) | |
70 | //#define RESYNC_BLOCK_SIZE PAGE_SIZE | |
71 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) | |
72 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
73 | #define RESYNC_WINDOW (2048*1024) | |
74 | ||
dd0fc66f | 75 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
76 | { |
77 | struct pool_info *pi = data; | |
78 | struct page *page; | |
79 | r1bio_t *r1_bio; | |
80 | struct bio *bio; | |
81 | int i, j; | |
82 | ||
83 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 84 | if (!r1_bio) |
1da177e4 | 85 | return NULL; |
1da177e4 LT |
86 | |
87 | /* | |
88 | * Allocate bios : 1 for reading, n-1 for writing | |
89 | */ | |
90 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 91 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
92 | if (!bio) |
93 | goto out_free_bio; | |
94 | r1_bio->bios[j] = bio; | |
95 | } | |
96 | /* | |
97 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
98 | * the first bio. |
99 | * If this is a user-requested check/repair, allocate | |
100 | * RESYNC_PAGES for each bio. | |
1da177e4 | 101 | */ |
d11c171e N |
102 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
103 | j = pi->raid_disks; | |
104 | else | |
105 | j = 1; | |
106 | while(j--) { | |
107 | bio = r1_bio->bios[j]; | |
108 | for (i = 0; i < RESYNC_PAGES; i++) { | |
109 | page = alloc_page(gfp_flags); | |
110 | if (unlikely(!page)) | |
111 | goto out_free_pages; | |
112 | ||
113 | bio->bi_io_vec[i].bv_page = page; | |
303a0e11 | 114 | bio->bi_vcnt = i+1; |
d11c171e N |
115 | } |
116 | } | |
117 | /* If not user-requests, copy the page pointers to all bios */ | |
118 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
119 | for (i=0; i<RESYNC_PAGES ; i++) | |
120 | for (j=1; j<pi->raid_disks; j++) | |
121 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
122 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
123 | } |
124 | ||
125 | r1_bio->master_bio = NULL; | |
126 | ||
127 | return r1_bio; | |
128 | ||
129 | out_free_pages: | |
303a0e11 N |
130 | for (j=0 ; j < pi->raid_disks; j++) |
131 | for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) | |
132 | put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); | |
d11c171e | 133 | j = -1; |
1da177e4 LT |
134 | out_free_bio: |
135 | while ( ++j < pi->raid_disks ) | |
136 | bio_put(r1_bio->bios[j]); | |
137 | r1bio_pool_free(r1_bio, data); | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
142 | { | |
143 | struct pool_info *pi = data; | |
d11c171e | 144 | int i,j; |
1da177e4 | 145 | r1bio_t *r1bio = __r1_bio; |
1da177e4 | 146 | |
d11c171e N |
147 | for (i = 0; i < RESYNC_PAGES; i++) |
148 | for (j = pi->raid_disks; j-- ;) { | |
149 | if (j == 0 || | |
150 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
151 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 152 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 153 | } |
1da177e4 LT |
154 | for (i=0 ; i < pi->raid_disks; i++) |
155 | bio_put(r1bio->bios[i]); | |
156 | ||
157 | r1bio_pool_free(r1bio, data); | |
158 | } | |
159 | ||
160 | static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) | |
161 | { | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < conf->raid_disks; i++) { | |
165 | struct bio **bio = r1_bio->bios + i; | |
4367af55 | 166 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
167 | bio_put(*bio); |
168 | *bio = NULL; | |
169 | } | |
170 | } | |
171 | ||
858119e1 | 172 | static void free_r1bio(r1bio_t *r1_bio) |
1da177e4 | 173 | { |
070ec55d | 174 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 175 | |
1da177e4 LT |
176 | put_all_bios(conf, r1_bio); |
177 | mempool_free(r1_bio, conf->r1bio_pool); | |
178 | } | |
179 | ||
858119e1 | 180 | static void put_buf(r1bio_t *r1_bio) |
1da177e4 | 181 | { |
070ec55d | 182 | conf_t *conf = r1_bio->mddev->private; |
3e198f78 N |
183 | int i; |
184 | ||
185 | for (i=0; i<conf->raid_disks; i++) { | |
186 | struct bio *bio = r1_bio->bios[i]; | |
187 | if (bio->bi_end_io) | |
188 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
189 | } | |
1da177e4 LT |
190 | |
191 | mempool_free(r1_bio, conf->r1buf_pool); | |
192 | ||
17999be4 | 193 | lower_barrier(conf); |
1da177e4 LT |
194 | } |
195 | ||
196 | static void reschedule_retry(r1bio_t *r1_bio) | |
197 | { | |
198 | unsigned long flags; | |
199 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 200 | conf_t *conf = mddev->private; |
1da177e4 LT |
201 | |
202 | spin_lock_irqsave(&conf->device_lock, flags); | |
203 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 204 | conf->nr_queued ++; |
1da177e4 LT |
205 | spin_unlock_irqrestore(&conf->device_lock, flags); |
206 | ||
17999be4 | 207 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
208 | md_wakeup_thread(mddev->thread); |
209 | } | |
210 | ||
211 | /* | |
212 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
213 | * operation and are ready to return a success/failure code to the buffer | |
214 | * cache layer. | |
215 | */ | |
d2eb35ac N |
216 | static void call_bio_endio(r1bio_t *r1_bio) |
217 | { | |
218 | struct bio *bio = r1_bio->master_bio; | |
219 | int done; | |
220 | conf_t *conf = r1_bio->mddev->private; | |
221 | ||
222 | if (bio->bi_phys_segments) { | |
223 | unsigned long flags; | |
224 | spin_lock_irqsave(&conf->device_lock, flags); | |
225 | bio->bi_phys_segments--; | |
226 | done = (bio->bi_phys_segments == 0); | |
227 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
228 | } else | |
229 | done = 1; | |
230 | ||
231 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
232 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
233 | if (done) { | |
234 | bio_endio(bio, 0); | |
235 | /* | |
236 | * Wake up any possible resync thread that waits for the device | |
237 | * to go idle. | |
238 | */ | |
239 | allow_barrier(conf); | |
240 | } | |
241 | } | |
242 | ||
1da177e4 LT |
243 | static void raid_end_bio_io(r1bio_t *r1_bio) |
244 | { | |
245 | struct bio *bio = r1_bio->master_bio; | |
246 | ||
4b6d287f N |
247 | /* if nobody has done the final endio yet, do it now */ |
248 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
249 | PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", | |
250 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
251 | (unsigned long long) bio->bi_sector, | |
252 | (unsigned long long) bio->bi_sector + | |
253 | (bio->bi_size >> 9) - 1); | |
254 | ||
d2eb35ac | 255 | call_bio_endio(r1_bio); |
4b6d287f | 256 | } |
1da177e4 LT |
257 | free_r1bio(r1_bio); |
258 | } | |
259 | ||
260 | /* | |
261 | * Update disk head position estimator based on IRQ completion info. | |
262 | */ | |
263 | static inline void update_head_pos(int disk, r1bio_t *r1_bio) | |
264 | { | |
070ec55d | 265 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 LT |
266 | |
267 | conf->mirrors[disk].head_position = | |
268 | r1_bio->sector + (r1_bio->sectors); | |
269 | } | |
270 | ||
6712ecf8 | 271 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
272 | { |
273 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 274 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 275 | int mirror; |
070ec55d | 276 | conf_t *conf = r1_bio->mddev->private; |
1da177e4 | 277 | |
1da177e4 LT |
278 | mirror = r1_bio->read_disk; |
279 | /* | |
280 | * this branch is our 'one mirror IO has finished' event handler: | |
281 | */ | |
ddaf22ab N |
282 | update_head_pos(mirror, r1_bio); |
283 | ||
dd00a99e N |
284 | if (uptodate) |
285 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
286 | else { | |
287 | /* If all other devices have failed, we want to return | |
288 | * the error upwards rather than fail the last device. | |
289 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 290 | */ |
dd00a99e N |
291 | unsigned long flags; |
292 | spin_lock_irqsave(&conf->device_lock, flags); | |
293 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
294 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
295 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
296 | uptodate = 1; | |
297 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
298 | } | |
1da177e4 | 299 | |
dd00a99e | 300 | if (uptodate) |
1da177e4 | 301 | raid_end_bio_io(r1_bio); |
dd00a99e | 302 | else { |
1da177e4 LT |
303 | /* |
304 | * oops, read error: | |
305 | */ | |
306 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
307 | printk_ratelimited( |
308 | KERN_ERR "md/raid1:%s: %s: " | |
309 | "rescheduling sector %llu\n", | |
310 | mdname(conf->mddev), | |
311 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
312 | b), | |
313 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 314 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 LT |
315 | reschedule_retry(r1_bio); |
316 | } | |
317 | ||
318 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); | |
1da177e4 LT |
319 | } |
320 | ||
cd5ff9a1 N |
321 | static void close_write(r1bio_t *r1_bio) |
322 | { | |
323 | /* it really is the end of this request */ | |
324 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
325 | /* free extra copy of the data pages */ | |
326 | int i = r1_bio->behind_page_count; | |
327 | while (i--) | |
328 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
329 | kfree(r1_bio->behind_bvecs); | |
330 | r1_bio->behind_bvecs = NULL; | |
331 | } | |
332 | /* clear the bitmap if all writes complete successfully */ | |
333 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
334 | r1_bio->sectors, | |
335 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
336 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
337 | md_write_end(r1_bio->mddev); | |
338 | } | |
339 | ||
af6d7b76 | 340 | static void r1_bio_write_done(r1bio_t *r1_bio) |
4e78064f | 341 | { |
cd5ff9a1 N |
342 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
343 | return; | |
344 | ||
345 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
346 | reschedule_retry(r1_bio); | |
347 | else { | |
348 | close_write(r1_bio); | |
4367af55 N |
349 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
350 | reschedule_retry(r1_bio); | |
351 | else | |
352 | raid_end_bio_io(r1_bio); | |
4e78064f N |
353 | } |
354 | } | |
355 | ||
6712ecf8 | 356 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
357 | { |
358 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 359 | r1bio_t *r1_bio = bio->bi_private; |
a9701a30 | 360 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
070ec55d | 361 | conf_t *conf = r1_bio->mddev->private; |
04b857f7 | 362 | struct bio *to_put = NULL; |
1da177e4 | 363 | |
1da177e4 LT |
364 | |
365 | for (mirror = 0; mirror < conf->raid_disks; mirror++) | |
366 | if (r1_bio->bios[mirror] == bio) | |
367 | break; | |
368 | ||
e9c7469b TH |
369 | /* |
370 | * 'one mirror IO has finished' event handler: | |
371 | */ | |
e9c7469b | 372 | if (!uptodate) { |
cd5ff9a1 N |
373 | set_bit(WriteErrorSeen, |
374 | &conf->mirrors[mirror].rdev->flags); | |
375 | set_bit(R1BIO_WriteError, &r1_bio->state); | |
4367af55 | 376 | } else { |
1da177e4 | 377 | /* |
e9c7469b TH |
378 | * Set R1BIO_Uptodate in our master bio, so that we |
379 | * will return a good error code for to the higher | |
380 | * levels even if IO on some other mirrored buffer | |
381 | * fails. | |
382 | * | |
383 | * The 'master' represents the composite IO operation | |
384 | * to user-side. So if something waits for IO, then it | |
385 | * will wait for the 'master' bio. | |
1da177e4 | 386 | */ |
4367af55 N |
387 | sector_t first_bad; |
388 | int bad_sectors; | |
389 | ||
cd5ff9a1 N |
390 | r1_bio->bios[mirror] = NULL; |
391 | to_put = bio; | |
e9c7469b TH |
392 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
393 | ||
4367af55 N |
394 | /* Maybe we can clear some bad blocks. */ |
395 | if (is_badblock(conf->mirrors[mirror].rdev, | |
396 | r1_bio->sector, r1_bio->sectors, | |
397 | &first_bad, &bad_sectors)) { | |
398 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
399 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
400 | } | |
401 | } | |
402 | ||
e9c7469b TH |
403 | update_head_pos(mirror, r1_bio); |
404 | ||
405 | if (behind) { | |
406 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
407 | atomic_dec(&r1_bio->behind_remaining); | |
408 | ||
409 | /* | |
410 | * In behind mode, we ACK the master bio once the I/O | |
411 | * has safely reached all non-writemostly | |
412 | * disks. Setting the Returned bit ensures that this | |
413 | * gets done only once -- we don't ever want to return | |
414 | * -EIO here, instead we'll wait | |
415 | */ | |
416 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
417 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
418 | /* Maybe we can return now */ | |
419 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
420 | struct bio *mbio = r1_bio->master_bio; | |
421 | PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", | |
422 | (unsigned long long) mbio->bi_sector, | |
423 | (unsigned long long) mbio->bi_sector + | |
424 | (mbio->bi_size >> 9) - 1); | |
d2eb35ac | 425 | call_bio_endio(r1_bio); |
4b6d287f N |
426 | } |
427 | } | |
428 | } | |
4367af55 N |
429 | if (r1_bio->bios[mirror] == NULL) |
430 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
431 | conf->mddev); | |
e9c7469b | 432 | |
1da177e4 | 433 | /* |
1da177e4 LT |
434 | * Let's see if all mirrored write operations have finished |
435 | * already. | |
436 | */ | |
af6d7b76 | 437 | r1_bio_write_done(r1_bio); |
c70810b3 | 438 | |
04b857f7 N |
439 | if (to_put) |
440 | bio_put(to_put); | |
1da177e4 LT |
441 | } |
442 | ||
443 | ||
444 | /* | |
445 | * This routine returns the disk from which the requested read should | |
446 | * be done. There is a per-array 'next expected sequential IO' sector | |
447 | * number - if this matches on the next IO then we use the last disk. | |
448 | * There is also a per-disk 'last know head position' sector that is | |
449 | * maintained from IRQ contexts, both the normal and the resync IO | |
450 | * completion handlers update this position correctly. If there is no | |
451 | * perfect sequential match then we pick the disk whose head is closest. | |
452 | * | |
453 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
454 | * because position is mirror, not device based. | |
455 | * | |
456 | * The rdev for the device selected will have nr_pending incremented. | |
457 | */ | |
d2eb35ac | 458 | static int read_balance(conf_t *conf, r1bio_t *r1_bio, int *max_sectors) |
1da177e4 | 459 | { |
af3a2cd6 | 460 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
461 | int sectors; |
462 | int best_good_sectors; | |
f3ac8bf7 | 463 | int start_disk; |
76073054 | 464 | int best_disk; |
f3ac8bf7 | 465 | int i; |
76073054 | 466 | sector_t best_dist; |
8ddf9efe | 467 | mdk_rdev_t *rdev; |
f3ac8bf7 | 468 | int choose_first; |
1da177e4 LT |
469 | |
470 | rcu_read_lock(); | |
471 | /* | |
8ddf9efe | 472 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
473 | * device if no resync is going on, or below the resync window. |
474 | * We take the first readable disk when above the resync window. | |
475 | */ | |
476 | retry: | |
d2eb35ac | 477 | sectors = r1_bio->sectors; |
76073054 N |
478 | best_disk = -1; |
479 | best_dist = MaxSector; | |
d2eb35ac N |
480 | best_good_sectors = 0; |
481 | ||
1da177e4 LT |
482 | if (conf->mddev->recovery_cp < MaxSector && |
483 | (this_sector + sectors >= conf->next_resync)) { | |
f3ac8bf7 N |
484 | choose_first = 1; |
485 | start_disk = 0; | |
486 | } else { | |
487 | choose_first = 0; | |
488 | start_disk = conf->last_used; | |
1da177e4 LT |
489 | } |
490 | ||
f3ac8bf7 | 491 | for (i = 0 ; i < conf->raid_disks ; i++) { |
76073054 | 492 | sector_t dist; |
d2eb35ac N |
493 | sector_t first_bad; |
494 | int bad_sectors; | |
495 | ||
f3ac8bf7 N |
496 | int disk = start_disk + i; |
497 | if (disk >= conf->raid_disks) | |
498 | disk -= conf->raid_disks; | |
499 | ||
500 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
501 | if (r1_bio->bios[disk] == IO_BLOCKED | |
502 | || rdev == NULL | |
76073054 | 503 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 504 | continue; |
76073054 N |
505 | if (!test_bit(In_sync, &rdev->flags) && |
506 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 507 | continue; |
76073054 N |
508 | if (test_bit(WriteMostly, &rdev->flags)) { |
509 | /* Don't balance among write-mostly, just | |
510 | * use the first as a last resort */ | |
511 | if (best_disk < 0) | |
512 | best_disk = disk; | |
513 | continue; | |
514 | } | |
515 | /* This is a reasonable device to use. It might | |
516 | * even be best. | |
517 | */ | |
d2eb35ac N |
518 | if (is_badblock(rdev, this_sector, sectors, |
519 | &first_bad, &bad_sectors)) { | |
520 | if (best_dist < MaxSector) | |
521 | /* already have a better device */ | |
522 | continue; | |
523 | if (first_bad <= this_sector) { | |
524 | /* cannot read here. If this is the 'primary' | |
525 | * device, then we must not read beyond | |
526 | * bad_sectors from another device.. | |
527 | */ | |
528 | bad_sectors -= (this_sector - first_bad); | |
529 | if (choose_first && sectors > bad_sectors) | |
530 | sectors = bad_sectors; | |
531 | if (best_good_sectors > sectors) | |
532 | best_good_sectors = sectors; | |
533 | ||
534 | } else { | |
535 | sector_t good_sectors = first_bad - this_sector; | |
536 | if (good_sectors > best_good_sectors) { | |
537 | best_good_sectors = good_sectors; | |
538 | best_disk = disk; | |
539 | } | |
540 | if (choose_first) | |
541 | break; | |
542 | } | |
543 | continue; | |
544 | } else | |
545 | best_good_sectors = sectors; | |
546 | ||
76073054 N |
547 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
548 | if (choose_first | |
549 | /* Don't change to another disk for sequential reads */ | |
550 | || conf->next_seq_sect == this_sector | |
551 | || dist == 0 | |
552 | /* If device is idle, use it */ | |
553 | || atomic_read(&rdev->nr_pending) == 0) { | |
554 | best_disk = disk; | |
1da177e4 LT |
555 | break; |
556 | } | |
76073054 N |
557 | if (dist < best_dist) { |
558 | best_dist = dist; | |
559 | best_disk = disk; | |
1da177e4 | 560 | } |
f3ac8bf7 | 561 | } |
1da177e4 | 562 | |
76073054 N |
563 | if (best_disk >= 0) { |
564 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
565 | if (!rdev) |
566 | goto retry; | |
567 | atomic_inc(&rdev->nr_pending); | |
76073054 | 568 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
569 | /* cannot risk returning a device that failed |
570 | * before we inc'ed nr_pending | |
571 | */ | |
03c902e1 | 572 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
573 | goto retry; |
574 | } | |
d2eb35ac | 575 | sectors = best_good_sectors; |
8ddf9efe | 576 | conf->next_seq_sect = this_sector + sectors; |
76073054 | 577 | conf->last_used = best_disk; |
1da177e4 LT |
578 | } |
579 | rcu_read_unlock(); | |
d2eb35ac | 580 | *max_sectors = sectors; |
1da177e4 | 581 | |
76073054 | 582 | return best_disk; |
1da177e4 LT |
583 | } |
584 | ||
1ed7242e | 585 | int md_raid1_congested(mddev_t *mddev, int bits) |
0d129228 | 586 | { |
070ec55d | 587 | conf_t *conf = mddev->private; |
0d129228 N |
588 | int i, ret = 0; |
589 | ||
590 | rcu_read_lock(); | |
591 | for (i = 0; i < mddev->raid_disks; i++) { | |
592 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
593 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
165125e1 | 594 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 595 | |
1ed7242e JB |
596 | BUG_ON(!q); |
597 | ||
0d129228 N |
598 | /* Note the '|| 1' - when read_balance prefers |
599 | * non-congested targets, it can be removed | |
600 | */ | |
91a9e99d | 601 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
602 | ret |= bdi_congested(&q->backing_dev_info, bits); |
603 | else | |
604 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
605 | } | |
606 | } | |
607 | rcu_read_unlock(); | |
608 | return ret; | |
609 | } | |
1ed7242e | 610 | EXPORT_SYMBOL_GPL(md_raid1_congested); |
0d129228 | 611 | |
1ed7242e JB |
612 | static int raid1_congested(void *data, int bits) |
613 | { | |
614 | mddev_t *mddev = data; | |
615 | ||
616 | return mddev_congested(mddev, bits) || | |
617 | md_raid1_congested(mddev, bits); | |
618 | } | |
0d129228 | 619 | |
7eaceacc | 620 | static void flush_pending_writes(conf_t *conf) |
a35e63ef N |
621 | { |
622 | /* Any writes that have been queued but are awaiting | |
623 | * bitmap updates get flushed here. | |
a35e63ef | 624 | */ |
a35e63ef N |
625 | spin_lock_irq(&conf->device_lock); |
626 | ||
627 | if (conf->pending_bio_list.head) { | |
628 | struct bio *bio; | |
629 | bio = bio_list_get(&conf->pending_bio_list); | |
a35e63ef N |
630 | spin_unlock_irq(&conf->device_lock); |
631 | /* flush any pending bitmap writes to | |
632 | * disk before proceeding w/ I/O */ | |
633 | bitmap_unplug(conf->mddev->bitmap); | |
634 | ||
635 | while (bio) { /* submit pending writes */ | |
636 | struct bio *next = bio->bi_next; | |
637 | bio->bi_next = NULL; | |
638 | generic_make_request(bio); | |
639 | bio = next; | |
640 | } | |
a35e63ef N |
641 | } else |
642 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
643 | } |
644 | ||
17999be4 N |
645 | /* Barriers.... |
646 | * Sometimes we need to suspend IO while we do something else, | |
647 | * either some resync/recovery, or reconfigure the array. | |
648 | * To do this we raise a 'barrier'. | |
649 | * The 'barrier' is a counter that can be raised multiple times | |
650 | * to count how many activities are happening which preclude | |
651 | * normal IO. | |
652 | * We can only raise the barrier if there is no pending IO. | |
653 | * i.e. if nr_pending == 0. | |
654 | * We choose only to raise the barrier if no-one is waiting for the | |
655 | * barrier to go down. This means that as soon as an IO request | |
656 | * is ready, no other operations which require a barrier will start | |
657 | * until the IO request has had a chance. | |
658 | * | |
659 | * So: regular IO calls 'wait_barrier'. When that returns there | |
660 | * is no backgroup IO happening, It must arrange to call | |
661 | * allow_barrier when it has finished its IO. | |
662 | * backgroup IO calls must call raise_barrier. Once that returns | |
663 | * there is no normal IO happeing. It must arrange to call | |
664 | * lower_barrier when the particular background IO completes. | |
1da177e4 LT |
665 | */ |
666 | #define RESYNC_DEPTH 32 | |
667 | ||
17999be4 | 668 | static void raise_barrier(conf_t *conf) |
1da177e4 LT |
669 | { |
670 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
671 | |
672 | /* Wait until no block IO is waiting */ | |
673 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
c3b328ac | 674 | conf->resync_lock, ); |
17999be4 N |
675 | |
676 | /* block any new IO from starting */ | |
677 | conf->barrier++; | |
678 | ||
046abeed | 679 | /* Now wait for all pending IO to complete */ |
17999be4 N |
680 | wait_event_lock_irq(conf->wait_barrier, |
681 | !conf->nr_pending && conf->barrier < RESYNC_DEPTH, | |
c3b328ac | 682 | conf->resync_lock, ); |
17999be4 N |
683 | |
684 | spin_unlock_irq(&conf->resync_lock); | |
685 | } | |
686 | ||
687 | static void lower_barrier(conf_t *conf) | |
688 | { | |
689 | unsigned long flags; | |
709ae487 | 690 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
691 | spin_lock_irqsave(&conf->resync_lock, flags); |
692 | conf->barrier--; | |
693 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
694 | wake_up(&conf->wait_barrier); | |
695 | } | |
696 | ||
697 | static void wait_barrier(conf_t *conf) | |
698 | { | |
699 | spin_lock_irq(&conf->resync_lock); | |
700 | if (conf->barrier) { | |
701 | conf->nr_waiting++; | |
702 | wait_event_lock_irq(conf->wait_barrier, !conf->barrier, | |
703 | conf->resync_lock, | |
c3b328ac | 704 | ); |
17999be4 | 705 | conf->nr_waiting--; |
1da177e4 | 706 | } |
17999be4 | 707 | conf->nr_pending++; |
1da177e4 LT |
708 | spin_unlock_irq(&conf->resync_lock); |
709 | } | |
710 | ||
17999be4 N |
711 | static void allow_barrier(conf_t *conf) |
712 | { | |
713 | unsigned long flags; | |
714 | spin_lock_irqsave(&conf->resync_lock, flags); | |
715 | conf->nr_pending--; | |
716 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
717 | wake_up(&conf->wait_barrier); | |
718 | } | |
719 | ||
ddaf22ab N |
720 | static void freeze_array(conf_t *conf) |
721 | { | |
722 | /* stop syncio and normal IO and wait for everything to | |
723 | * go quite. | |
724 | * We increment barrier and nr_waiting, and then | |
1c830532 N |
725 | * wait until nr_pending match nr_queued+1 |
726 | * This is called in the context of one normal IO request | |
727 | * that has failed. Thus any sync request that might be pending | |
728 | * will be blocked by nr_pending, and we need to wait for | |
729 | * pending IO requests to complete or be queued for re-try. | |
730 | * Thus the number queued (nr_queued) plus this request (1) | |
731 | * must match the number of pending IOs (nr_pending) before | |
732 | * we continue. | |
ddaf22ab N |
733 | */ |
734 | spin_lock_irq(&conf->resync_lock); | |
735 | conf->barrier++; | |
736 | conf->nr_waiting++; | |
737 | wait_event_lock_irq(conf->wait_barrier, | |
1c830532 | 738 | conf->nr_pending == conf->nr_queued+1, |
ddaf22ab | 739 | conf->resync_lock, |
c3b328ac | 740 | flush_pending_writes(conf)); |
ddaf22ab N |
741 | spin_unlock_irq(&conf->resync_lock); |
742 | } | |
743 | static void unfreeze_array(conf_t *conf) | |
744 | { | |
745 | /* reverse the effect of the freeze */ | |
746 | spin_lock_irq(&conf->resync_lock); | |
747 | conf->barrier--; | |
748 | conf->nr_waiting--; | |
749 | wake_up(&conf->wait_barrier); | |
750 | spin_unlock_irq(&conf->resync_lock); | |
751 | } | |
752 | ||
17999be4 | 753 | |
4e78064f | 754 | /* duplicate the data pages for behind I/O |
4e78064f | 755 | */ |
af6d7b76 | 756 | static void alloc_behind_pages(struct bio *bio, r1bio_t *r1_bio) |
4b6d287f N |
757 | { |
758 | int i; | |
759 | struct bio_vec *bvec; | |
2ca68f5e | 760 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 761 | GFP_NOIO); |
2ca68f5e | 762 | if (unlikely(!bvecs)) |
af6d7b76 | 763 | return; |
4b6d287f | 764 | |
4b6d287f | 765 | bio_for_each_segment(bvec, bio, i) { |
2ca68f5e N |
766 | bvecs[i] = *bvec; |
767 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
768 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 769 | goto do_sync_io; |
2ca68f5e N |
770 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
771 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
772 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
773 | kunmap(bvec->bv_page); |
774 | } | |
2ca68f5e | 775 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
776 | r1_bio->behind_page_count = bio->bi_vcnt; |
777 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
778 | return; | |
4b6d287f N |
779 | |
780 | do_sync_io: | |
af6d7b76 | 781 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
782 | if (bvecs[i].bv_page) |
783 | put_page(bvecs[i].bv_page); | |
784 | kfree(bvecs); | |
4b6d287f | 785 | PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); |
4b6d287f N |
786 | } |
787 | ||
21a52c6d | 788 | static int make_request(mddev_t *mddev, struct bio * bio) |
1da177e4 | 789 | { |
070ec55d | 790 | conf_t *conf = mddev->private; |
1da177e4 LT |
791 | mirror_info_t *mirror; |
792 | r1bio_t *r1_bio; | |
793 | struct bio *read_bio; | |
1f68f0c4 | 794 | int i, disks; |
84255d10 | 795 | struct bitmap *bitmap; |
191ea9b2 | 796 | unsigned long flags; |
a362357b | 797 | const int rw = bio_data_dir(bio); |
2c7d46ec | 798 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 799 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
6bfe0b49 | 800 | mdk_rdev_t *blocked_rdev; |
c3b328ac | 801 | int plugged; |
1f68f0c4 N |
802 | int first_clone; |
803 | int sectors_handled; | |
804 | int max_sectors; | |
191ea9b2 | 805 | |
1da177e4 LT |
806 | /* |
807 | * Register the new request and wait if the reconstruction | |
808 | * thread has put up a bar for new requests. | |
809 | * Continue immediately if no resync is active currently. | |
810 | */ | |
62de608d | 811 | |
3d310eb7 N |
812 | md_write_start(mddev, bio); /* wait on superblock update early */ |
813 | ||
6eef4b21 N |
814 | if (bio_data_dir(bio) == WRITE && |
815 | bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && | |
816 | bio->bi_sector < mddev->suspend_hi) { | |
817 | /* As the suspend_* range is controlled by | |
818 | * userspace, we want an interruptible | |
819 | * wait. | |
820 | */ | |
821 | DEFINE_WAIT(w); | |
822 | for (;;) { | |
823 | flush_signals(current); | |
824 | prepare_to_wait(&conf->wait_barrier, | |
825 | &w, TASK_INTERRUPTIBLE); | |
826 | if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || | |
827 | bio->bi_sector >= mddev->suspend_hi) | |
828 | break; | |
829 | schedule(); | |
830 | } | |
831 | finish_wait(&conf->wait_barrier, &w); | |
832 | } | |
62de608d | 833 | |
17999be4 | 834 | wait_barrier(conf); |
1da177e4 | 835 | |
84255d10 N |
836 | bitmap = mddev->bitmap; |
837 | ||
1da177e4 LT |
838 | /* |
839 | * make_request() can abort the operation when READA is being | |
840 | * used and no empty request is available. | |
841 | * | |
842 | */ | |
843 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
844 | ||
845 | r1_bio->master_bio = bio; | |
846 | r1_bio->sectors = bio->bi_size >> 9; | |
191ea9b2 | 847 | r1_bio->state = 0; |
1da177e4 LT |
848 | r1_bio->mddev = mddev; |
849 | r1_bio->sector = bio->bi_sector; | |
850 | ||
d2eb35ac N |
851 | /* We might need to issue multiple reads to different |
852 | * devices if there are bad blocks around, so we keep | |
853 | * track of the number of reads in bio->bi_phys_segments. | |
854 | * If this is 0, there is only one r1_bio and no locking | |
855 | * will be needed when requests complete. If it is | |
856 | * non-zero, then it is the number of not-completed requests. | |
857 | */ | |
858 | bio->bi_phys_segments = 0; | |
859 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
860 | ||
a362357b | 861 | if (rw == READ) { |
1da177e4 LT |
862 | /* |
863 | * read balancing logic: | |
864 | */ | |
d2eb35ac N |
865 | int rdisk; |
866 | ||
867 | read_again: | |
868 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
869 | |
870 | if (rdisk < 0) { | |
871 | /* couldn't find anywhere to read from */ | |
872 | raid_end_bio_io(r1_bio); | |
873 | return 0; | |
874 | } | |
875 | mirror = conf->mirrors + rdisk; | |
876 | ||
e555190d N |
877 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
878 | bitmap) { | |
879 | /* Reading from a write-mostly device must | |
880 | * take care not to over-take any writes | |
881 | * that are 'behind' | |
882 | */ | |
883 | wait_event(bitmap->behind_wait, | |
884 | atomic_read(&bitmap->behind_writes) == 0); | |
885 | } | |
1da177e4 LT |
886 | r1_bio->read_disk = rdisk; |
887 | ||
a167f663 | 888 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
d2eb35ac N |
889 | md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, |
890 | max_sectors); | |
1da177e4 LT |
891 | |
892 | r1_bio->bios[rdisk] = read_bio; | |
893 | ||
894 | read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; | |
895 | read_bio->bi_bdev = mirror->rdev->bdev; | |
896 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 897 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
898 | read_bio->bi_private = r1_bio; |
899 | ||
d2eb35ac N |
900 | if (max_sectors < r1_bio->sectors) { |
901 | /* could not read all from this device, so we will | |
902 | * need another r1_bio. | |
903 | */ | |
d2eb35ac N |
904 | |
905 | sectors_handled = (r1_bio->sector + max_sectors | |
906 | - bio->bi_sector); | |
907 | r1_bio->sectors = max_sectors; | |
908 | spin_lock_irq(&conf->device_lock); | |
909 | if (bio->bi_phys_segments == 0) | |
910 | bio->bi_phys_segments = 2; | |
911 | else | |
912 | bio->bi_phys_segments++; | |
913 | spin_unlock_irq(&conf->device_lock); | |
914 | /* Cannot call generic_make_request directly | |
915 | * as that will be queued in __make_request | |
916 | * and subsequent mempool_alloc might block waiting | |
917 | * for it. So hand bio over to raid1d. | |
918 | */ | |
919 | reschedule_retry(r1_bio); | |
920 | ||
921 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
922 | ||
923 | r1_bio->master_bio = bio; | |
924 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
925 | r1_bio->state = 0; | |
926 | r1_bio->mddev = mddev; | |
927 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
928 | goto read_again; | |
929 | } else | |
930 | generic_make_request(read_bio); | |
1da177e4 LT |
931 | return 0; |
932 | } | |
933 | ||
934 | /* | |
935 | * WRITE: | |
936 | */ | |
1f68f0c4 | 937 | /* first select target devices under rcu_lock and |
1da177e4 LT |
938 | * inc refcount on their rdev. Record them by setting |
939 | * bios[x] to bio | |
1f68f0c4 N |
940 | * If there are known/acknowledged bad blocks on any device on |
941 | * which we have seen a write error, we want to avoid writing those | |
942 | * blocks. | |
943 | * This potentially requires several writes to write around | |
944 | * the bad blocks. Each set of writes gets it's own r1bio | |
945 | * with a set of bios attached. | |
1da177e4 | 946 | */ |
c3b328ac N |
947 | plugged = mddev_check_plugged(mddev); |
948 | ||
1da177e4 | 949 | disks = conf->raid_disks; |
6bfe0b49 DW |
950 | retry_write: |
951 | blocked_rdev = NULL; | |
1da177e4 | 952 | rcu_read_lock(); |
1f68f0c4 | 953 | max_sectors = r1_bio->sectors; |
1da177e4 | 954 | for (i = 0; i < disks; i++) { |
6bfe0b49 DW |
955 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
956 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { | |
957 | atomic_inc(&rdev->nr_pending); | |
958 | blocked_rdev = rdev; | |
959 | break; | |
960 | } | |
1f68f0c4 N |
961 | r1_bio->bios[i] = NULL; |
962 | if (!rdev || test_bit(Faulty, &rdev->flags)) { | |
963 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
964 | continue; | |
965 | } | |
966 | ||
967 | atomic_inc(&rdev->nr_pending); | |
968 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
969 | sector_t first_bad; | |
970 | int bad_sectors; | |
971 | int is_bad; | |
972 | ||
973 | is_bad = is_badblock(rdev, r1_bio->sector, | |
974 | max_sectors, | |
975 | &first_bad, &bad_sectors); | |
976 | if (is_bad < 0) { | |
977 | /* mustn't write here until the bad block is | |
978 | * acknowledged*/ | |
979 | set_bit(BlockedBadBlocks, &rdev->flags); | |
980 | blocked_rdev = rdev; | |
981 | break; | |
982 | } | |
983 | if (is_bad && first_bad <= r1_bio->sector) { | |
984 | /* Cannot write here at all */ | |
985 | bad_sectors -= (r1_bio->sector - first_bad); | |
986 | if (bad_sectors < max_sectors) | |
987 | /* mustn't write more than bad_sectors | |
988 | * to other devices yet | |
989 | */ | |
990 | max_sectors = bad_sectors; | |
03c902e1 | 991 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
992 | /* We don't set R1BIO_Degraded as that |
993 | * only applies if the disk is | |
994 | * missing, so it might be re-added, | |
995 | * and we want to know to recover this | |
996 | * chunk. | |
997 | * In this case the device is here, | |
998 | * and the fact that this chunk is not | |
999 | * in-sync is recorded in the bad | |
1000 | * block log | |
1001 | */ | |
1002 | continue; | |
964147d5 | 1003 | } |
1f68f0c4 N |
1004 | if (is_bad) { |
1005 | int good_sectors = first_bad - r1_bio->sector; | |
1006 | if (good_sectors < max_sectors) | |
1007 | max_sectors = good_sectors; | |
1008 | } | |
1009 | } | |
1010 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1011 | } |
1012 | rcu_read_unlock(); | |
1013 | ||
6bfe0b49 DW |
1014 | if (unlikely(blocked_rdev)) { |
1015 | /* Wait for this device to become unblocked */ | |
1016 | int j; | |
1017 | ||
1018 | for (j = 0; j < i; j++) | |
1019 | if (r1_bio->bios[j]) | |
1020 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1021 | r1_bio->state = 0; |
6bfe0b49 DW |
1022 | allow_barrier(conf); |
1023 | md_wait_for_blocked_rdev(blocked_rdev, mddev); | |
1024 | wait_barrier(conf); | |
1025 | goto retry_write; | |
1026 | } | |
1027 | ||
1f68f0c4 N |
1028 | if (max_sectors < r1_bio->sectors) { |
1029 | /* We are splitting this write into multiple parts, so | |
1030 | * we need to prepare for allocating another r1_bio. | |
1031 | */ | |
1032 | r1_bio->sectors = max_sectors; | |
1033 | spin_lock_irq(&conf->device_lock); | |
1034 | if (bio->bi_phys_segments == 0) | |
1035 | bio->bi_phys_segments = 2; | |
1036 | else | |
1037 | bio->bi_phys_segments++; | |
1038 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1039 | } |
1f68f0c4 | 1040 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; |
4b6d287f | 1041 | |
4e78064f | 1042 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1043 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1044 | |
1f68f0c4 | 1045 | first_clone = 1; |
1da177e4 LT |
1046 | for (i = 0; i < disks; i++) { |
1047 | struct bio *mbio; | |
1048 | if (!r1_bio->bios[i]) | |
1049 | continue; | |
1050 | ||
a167f663 | 1051 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
1f68f0c4 N |
1052 | md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); |
1053 | ||
1054 | if (first_clone) { | |
1055 | /* do behind I/O ? | |
1056 | * Not if there are too many, or cannot | |
1057 | * allocate memory, or a reader on WriteMostly | |
1058 | * is waiting for behind writes to flush */ | |
1059 | if (bitmap && | |
1060 | (atomic_read(&bitmap->behind_writes) | |
1061 | < mddev->bitmap_info.max_write_behind) && | |
1062 | !waitqueue_active(&bitmap->behind_wait)) | |
1063 | alloc_behind_pages(mbio, r1_bio); | |
1064 | ||
1065 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1066 | r1_bio->sectors, | |
1067 | test_bit(R1BIO_BehindIO, | |
1068 | &r1_bio->state)); | |
1069 | first_clone = 0; | |
1070 | } | |
2ca68f5e | 1071 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1072 | struct bio_vec *bvec; |
1073 | int j; | |
1074 | ||
1075 | /* Yes, I really want the '__' version so that | |
1076 | * we clear any unused pointer in the io_vec, rather | |
1077 | * than leave them unchanged. This is important | |
1078 | * because when we come to free the pages, we won't | |
046abeed | 1079 | * know the original bi_idx, so we just free |
4b6d287f N |
1080 | * them all |
1081 | */ | |
1082 | __bio_for_each_segment(bvec, mbio, j, 0) | |
2ca68f5e | 1083 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1084 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1085 | atomic_inc(&r1_bio->behind_remaining); | |
1086 | } | |
1087 | ||
1f68f0c4 N |
1088 | r1_bio->bios[i] = mbio; |
1089 | ||
1090 | mbio->bi_sector = (r1_bio->sector + | |
1091 | conf->mirrors[i].rdev->data_offset); | |
1092 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1093 | mbio->bi_end_io = raid1_end_write_request; | |
1094 | mbio->bi_rw = WRITE | do_flush_fua | do_sync; | |
1095 | mbio->bi_private = r1_bio; | |
1096 | ||
1da177e4 | 1097 | atomic_inc(&r1_bio->remaining); |
4e78064f N |
1098 | spin_lock_irqsave(&conf->device_lock, flags); |
1099 | bio_list_add(&conf->pending_bio_list, mbio); | |
4e78064f | 1100 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1101 | } |
af6d7b76 | 1102 | r1_bio_write_done(r1_bio); |
1da177e4 | 1103 | |
4e78064f | 1104 | /* In case raid1d snuck in to freeze_array */ |
a35e63ef N |
1105 | wake_up(&conf->wait_barrier); |
1106 | ||
1f68f0c4 N |
1107 | if (sectors_handled < (bio->bi_size >> 9)) { |
1108 | /* We need another r1_bio. It has already been counted | |
1109 | * in bio->bi_phys_segments | |
1110 | */ | |
1111 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1112 | r1_bio->master_bio = bio; | |
1113 | r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; | |
1114 | r1_bio->state = 0; | |
1115 | r1_bio->mddev = mddev; | |
1116 | r1_bio->sector = bio->bi_sector + sectors_handled; | |
1117 | goto retry_write; | |
1118 | } | |
1119 | ||
c3b328ac | 1120 | if (do_sync || !bitmap || !plugged) |
e3881a68 | 1121 | md_wakeup_thread(mddev->thread); |
191ea9b2 | 1122 | |
1da177e4 LT |
1123 | return 0; |
1124 | } | |
1125 | ||
1126 | static void status(struct seq_file *seq, mddev_t *mddev) | |
1127 | { | |
070ec55d | 1128 | conf_t *conf = mddev->private; |
1da177e4 LT |
1129 | int i; |
1130 | ||
1131 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1132 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1133 | rcu_read_lock(); |
1134 | for (i = 0; i < conf->raid_disks; i++) { | |
1135 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1da177e4 | 1136 | seq_printf(seq, "%s", |
ddac7c7e N |
1137 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1138 | } | |
1139 | rcu_read_unlock(); | |
1da177e4 LT |
1140 | seq_printf(seq, "]"); |
1141 | } | |
1142 | ||
1143 | ||
1144 | static void error(mddev_t *mddev, mdk_rdev_t *rdev) | |
1145 | { | |
1146 | char b[BDEVNAME_SIZE]; | |
070ec55d | 1147 | conf_t *conf = mddev->private; |
1da177e4 LT |
1148 | |
1149 | /* | |
1150 | * If it is not operational, then we have already marked it as dead | |
1151 | * else if it is the last working disks, ignore the error, let the | |
1152 | * next level up know. | |
1153 | * else mark the drive as failed | |
1154 | */ | |
b2d444d7 | 1155 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1156 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1157 | /* |
1158 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1159 | * normal single drive. |
1160 | * However don't try a recovery from this drive as | |
1161 | * it is very likely to fail. | |
1da177e4 | 1162 | */ |
5389042f | 1163 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1164 | return; |
4044ba58 | 1165 | } |
de393cde | 1166 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1167 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1168 | unsigned long flags; | |
1169 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1170 | mddev->degraded++; |
dd00a99e | 1171 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1172 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 LT |
1173 | /* |
1174 | * if recovery is running, make sure it aborts. | |
1175 | */ | |
dfc70645 | 1176 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
dd00a99e N |
1177 | } else |
1178 | set_bit(Faulty, &rdev->flags); | |
850b2b42 | 1179 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1180 | printk(KERN_ALERT |
1181 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1182 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1183 | mdname(mddev), bdevname(rdev->bdev, b), |
1184 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1185 | } |
1186 | ||
1187 | static void print_conf(conf_t *conf) | |
1188 | { | |
1189 | int i; | |
1da177e4 | 1190 | |
9dd1e2fa | 1191 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1192 | if (!conf) { |
9dd1e2fa | 1193 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1194 | return; |
1195 | } | |
9dd1e2fa | 1196 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1197 | conf->raid_disks); |
1198 | ||
ddac7c7e | 1199 | rcu_read_lock(); |
1da177e4 LT |
1200 | for (i = 0; i < conf->raid_disks; i++) { |
1201 | char b[BDEVNAME_SIZE]; | |
ddac7c7e N |
1202 | mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1203 | if (rdev) | |
9dd1e2fa | 1204 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1205 | i, !test_bit(In_sync, &rdev->flags), |
1206 | !test_bit(Faulty, &rdev->flags), | |
1207 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1208 | } |
ddac7c7e | 1209 | rcu_read_unlock(); |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | static void close_sync(conf_t *conf) | |
1213 | { | |
17999be4 N |
1214 | wait_barrier(conf); |
1215 | allow_barrier(conf); | |
1da177e4 LT |
1216 | |
1217 | mempool_destroy(conf->r1buf_pool); | |
1218 | conf->r1buf_pool = NULL; | |
1219 | } | |
1220 | ||
1221 | static int raid1_spare_active(mddev_t *mddev) | |
1222 | { | |
1223 | int i; | |
1224 | conf_t *conf = mddev->private; | |
6b965620 N |
1225 | int count = 0; |
1226 | unsigned long flags; | |
1da177e4 LT |
1227 | |
1228 | /* | |
1229 | * Find all failed disks within the RAID1 configuration | |
ddac7c7e N |
1230 | * and mark them readable. |
1231 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1232 | */ |
1233 | for (i = 0; i < conf->raid_disks; i++) { | |
ddac7c7e N |
1234 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; |
1235 | if (rdev | |
1236 | && !test_bit(Faulty, &rdev->flags) | |
c04be0aa | 1237 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1238 | count++; |
654e8b5a | 1239 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1240 | } |
1241 | } | |
6b965620 N |
1242 | spin_lock_irqsave(&conf->device_lock, flags); |
1243 | mddev->degraded -= count; | |
1244 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1245 | |
1246 | print_conf(conf); | |
6b965620 | 1247 | return count; |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | ||
1251 | static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) | |
1252 | { | |
1253 | conf_t *conf = mddev->private; | |
199050ea | 1254 | int err = -EEXIST; |
41158c7e | 1255 | int mirror = 0; |
1da177e4 | 1256 | mirror_info_t *p; |
6c2fce2e NB |
1257 | int first = 0; |
1258 | int last = mddev->raid_disks - 1; | |
1da177e4 | 1259 | |
5389042f N |
1260 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1261 | return -EBUSY; | |
1262 | ||
6c2fce2e NB |
1263 | if (rdev->raid_disk >= 0) |
1264 | first = last = rdev->raid_disk; | |
1265 | ||
1266 | for (mirror = first; mirror <= last; mirror++) | |
1da177e4 LT |
1267 | if ( !(p=conf->mirrors+mirror)->rdev) { |
1268 | ||
8f6c2e4b MP |
1269 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
1270 | rdev->data_offset << 9); | |
627a2d3c N |
1271 | /* as we don't honour merge_bvec_fn, we must |
1272 | * never risk violating it, so limit | |
1273 | * ->max_segments to one lying with a single | |
1274 | * page, as a one page request is never in | |
1275 | * violation. | |
1da177e4 | 1276 | */ |
627a2d3c N |
1277 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
1278 | blk_queue_max_segments(mddev->queue, 1); | |
1279 | blk_queue_segment_boundary(mddev->queue, | |
1280 | PAGE_CACHE_SIZE - 1); | |
1281 | } | |
1da177e4 LT |
1282 | |
1283 | p->head_position = 0; | |
1284 | rdev->raid_disk = mirror; | |
199050ea | 1285 | err = 0; |
6aea114a N |
1286 | /* As all devices are equivalent, we don't need a full recovery |
1287 | * if this was recently any drive of the array | |
1288 | */ | |
1289 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1290 | conf->fullsync = 1; |
d6065f7b | 1291 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1292 | break; |
1293 | } | |
ac5e7113 | 1294 | md_integrity_add_rdev(rdev, mddev); |
1da177e4 | 1295 | print_conf(conf); |
199050ea | 1296 | return err; |
1da177e4 LT |
1297 | } |
1298 | ||
1299 | static int raid1_remove_disk(mddev_t *mddev, int number) | |
1300 | { | |
1301 | conf_t *conf = mddev->private; | |
1302 | int err = 0; | |
1303 | mdk_rdev_t *rdev; | |
1304 | mirror_info_t *p = conf->mirrors+ number; | |
1305 | ||
1306 | print_conf(conf); | |
1307 | rdev = p->rdev; | |
1308 | if (rdev) { | |
b2d444d7 | 1309 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1310 | atomic_read(&rdev->nr_pending)) { |
1311 | err = -EBUSY; | |
1312 | goto abort; | |
1313 | } | |
046abeed | 1314 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1315 | * is not possible. |
1316 | */ | |
1317 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1318 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1319 | mddev->degraded < conf->raid_disks) { |
1320 | err = -EBUSY; | |
1321 | goto abort; | |
1322 | } | |
1da177e4 | 1323 | p->rdev = NULL; |
fbd568a3 | 1324 | synchronize_rcu(); |
1da177e4 LT |
1325 | if (atomic_read(&rdev->nr_pending)) { |
1326 | /* lost the race, try later */ | |
1327 | err = -EBUSY; | |
1328 | p->rdev = rdev; | |
ac5e7113 | 1329 | goto abort; |
1da177e4 | 1330 | } |
a91a2785 | 1331 | err = md_integrity_register(mddev); |
1da177e4 LT |
1332 | } |
1333 | abort: | |
1334 | ||
1335 | print_conf(conf); | |
1336 | return err; | |
1337 | } | |
1338 | ||
1339 | ||
6712ecf8 | 1340 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1341 | { |
7b92813c | 1342 | r1bio_t *r1_bio = bio->bi_private; |
d11c171e | 1343 | int i; |
1da177e4 | 1344 | |
d11c171e N |
1345 | for (i=r1_bio->mddev->raid_disks; i--; ) |
1346 | if (r1_bio->bios[i] == bio) | |
1347 | break; | |
1348 | BUG_ON(i < 0); | |
1349 | update_head_pos(i, r1_bio); | |
1da177e4 LT |
1350 | /* |
1351 | * we have read a block, now it needs to be re-written, | |
1352 | * or re-read if the read failed. | |
1353 | * We don't do much here, just schedule handling by raid1d | |
1354 | */ | |
69382e85 | 1355 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1356 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1357 | |
1358 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1359 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1360 | } |
1361 | ||
6712ecf8 | 1362 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1363 | { |
1364 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
7b92813c | 1365 | r1bio_t *r1_bio = bio->bi_private; |
1da177e4 | 1366 | mddev_t *mddev = r1_bio->mddev; |
070ec55d | 1367 | conf_t *conf = mddev->private; |
1da177e4 LT |
1368 | int i; |
1369 | int mirror=0; | |
4367af55 N |
1370 | sector_t first_bad; |
1371 | int bad_sectors; | |
1da177e4 | 1372 | |
1da177e4 LT |
1373 | for (i = 0; i < conf->raid_disks; i++) |
1374 | if (r1_bio->bios[i] == bio) { | |
1375 | mirror = i; | |
1376 | break; | |
1377 | } | |
6b1117d5 | 1378 | if (!uptodate) { |
57dab0bd | 1379 | sector_t sync_blocks = 0; |
6b1117d5 N |
1380 | sector_t s = r1_bio->sector; |
1381 | long sectors_to_go = r1_bio->sectors; | |
1382 | /* make sure these bits doesn't get cleared. */ | |
1383 | do { | |
5e3db645 | 1384 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1385 | &sync_blocks, 1); |
1386 | s += sync_blocks; | |
1387 | sectors_to_go -= sync_blocks; | |
1388 | } while (sectors_to_go > 0); | |
1da177e4 | 1389 | md_error(mddev, conf->mirrors[mirror].rdev); |
4367af55 N |
1390 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1391 | r1_bio->sector, | |
1392 | r1_bio->sectors, | |
1393 | &first_bad, &bad_sectors)) | |
1394 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
e3b9703e | 1395 | |
1da177e4 LT |
1396 | update_head_pos(mirror, r1_bio); |
1397 | ||
1398 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
4367af55 N |
1399 | int s = r1_bio->sectors; |
1400 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) | |
1401 | reschedule_retry(r1_bio); | |
1402 | else { | |
1403 | put_buf(r1_bio); | |
1404 | md_done_sync(mddev, s, uptodate); | |
1405 | } | |
1da177e4 | 1406 | } |
1da177e4 LT |
1407 | } |
1408 | ||
a68e5870 | 1409 | static int fix_sync_read_error(r1bio_t *r1_bio) |
1da177e4 | 1410 | { |
a68e5870 N |
1411 | /* Try some synchronous reads of other devices to get |
1412 | * good data, much like with normal read errors. Only | |
1413 | * read into the pages we already have so we don't | |
1414 | * need to re-issue the read request. | |
1415 | * We don't need to freeze the array, because being in an | |
1416 | * active sync request, there is no normal IO, and | |
1417 | * no overlapping syncs. | |
06f60385 N |
1418 | * We don't need to check is_badblock() again as we |
1419 | * made sure that anything with a bad block in range | |
1420 | * will have bi_end_io clear. | |
a68e5870 N |
1421 | */ |
1422 | mddev_t *mddev = r1_bio->mddev; | |
070ec55d | 1423 | conf_t *conf = mddev->private; |
a68e5870 N |
1424 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1425 | sector_t sect = r1_bio->sector; | |
1426 | int sectors = r1_bio->sectors; | |
1427 | int idx = 0; | |
1428 | ||
1429 | while(sectors) { | |
1430 | int s = sectors; | |
1431 | int d = r1_bio->read_disk; | |
1432 | int success = 0; | |
1433 | mdk_rdev_t *rdev; | |
78d7f5f7 | 1434 | int start; |
a68e5870 N |
1435 | |
1436 | if (s > (PAGE_SIZE>>9)) | |
1437 | s = PAGE_SIZE >> 9; | |
1438 | do { | |
1439 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1440 | /* No rcu protection needed here devices | |
1441 | * can only be removed when no resync is | |
1442 | * active, and resync is currently active | |
1443 | */ | |
1444 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1445 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1446 | bio->bi_io_vec[idx].bv_page, |
1447 | READ, false)) { | |
1448 | success = 1; | |
1449 | break; | |
1450 | } | |
1451 | } | |
1452 | d++; | |
1453 | if (d == conf->raid_disks) | |
1454 | d = 0; | |
1455 | } while (!success && d != r1_bio->read_disk); | |
1456 | ||
78d7f5f7 | 1457 | if (!success) { |
a68e5870 N |
1458 | char b[BDEVNAME_SIZE]; |
1459 | /* Cannot read from anywhere, array is toast */ | |
1460 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
1461 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" | |
1462 | " for block %llu\n", | |
1463 | mdname(mddev), | |
1464 | bdevname(bio->bi_bdev, b), | |
1465 | (unsigned long long)r1_bio->sector); | |
1466 | md_done_sync(mddev, r1_bio->sectors, 0); | |
d11c171e | 1467 | put_buf(r1_bio); |
a68e5870 | 1468 | return 0; |
d11c171e | 1469 | } |
78d7f5f7 N |
1470 | |
1471 | start = d; | |
1472 | /* write it back and re-read */ | |
1473 | while (d != r1_bio->read_disk) { | |
1474 | if (d == 0) | |
1475 | d = conf->raid_disks; | |
1476 | d--; | |
1477 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1478 | continue; | |
1479 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1480 | if (sync_page_io(rdev, sect, s<<9, |
78d7f5f7 N |
1481 | bio->bi_io_vec[idx].bv_page, |
1482 | WRITE, false) == 0) { | |
1483 | r1_bio->bios[d]->bi_end_io = NULL; | |
1484 | rdev_dec_pending(rdev, mddev); | |
1485 | md_error(mddev, rdev); | |
9d3d8011 | 1486 | } |
78d7f5f7 N |
1487 | } |
1488 | d = start; | |
1489 | while (d != r1_bio->read_disk) { | |
1490 | if (d == 0) | |
1491 | d = conf->raid_disks; | |
1492 | d--; | |
1493 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1494 | continue; | |
1495 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1496 | if (sync_page_io(rdev, sect, s<<9, |
78d7f5f7 N |
1497 | bio->bi_io_vec[idx].bv_page, |
1498 | READ, false) == 0) | |
1499 | md_error(mddev, rdev); | |
9d3d8011 NK |
1500 | else |
1501 | atomic_add(s, &rdev->corrected_errors); | |
78d7f5f7 | 1502 | } |
a68e5870 N |
1503 | sectors -= s; |
1504 | sect += s; | |
1505 | idx ++; | |
1506 | } | |
78d7f5f7 | 1507 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1508 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1509 | return 1; |
1510 | } | |
1511 | ||
1512 | static int process_checks(r1bio_t *r1_bio) | |
1513 | { | |
1514 | /* We have read all readable devices. If we haven't | |
1515 | * got the block, then there is no hope left. | |
1516 | * If we have, then we want to do a comparison | |
1517 | * and skip the write if everything is the same. | |
1518 | * If any blocks failed to read, then we need to | |
1519 | * attempt an over-write | |
1520 | */ | |
1521 | mddev_t *mddev = r1_bio->mddev; | |
1522 | conf_t *conf = mddev->private; | |
1523 | int primary; | |
1524 | int i; | |
1525 | ||
78d7f5f7 | 1526 | for (primary = 0; primary < conf->raid_disks; primary++) |
a68e5870 N |
1527 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1528 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1529 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1530 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1531 | break; | |
1532 | } | |
1533 | r1_bio->read_disk = primary; | |
78d7f5f7 N |
1534 | for (i = 0; i < conf->raid_disks; i++) { |
1535 | int j; | |
1536 | int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); | |
1537 | struct bio *pbio = r1_bio->bios[primary]; | |
1538 | struct bio *sbio = r1_bio->bios[i]; | |
1539 | int size; | |
a68e5870 | 1540 | |
78d7f5f7 N |
1541 | if (r1_bio->bios[i]->bi_end_io != end_sync_read) |
1542 | continue; | |
1543 | ||
1544 | if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { | |
1545 | for (j = vcnt; j-- ; ) { | |
1546 | struct page *p, *s; | |
1547 | p = pbio->bi_io_vec[j].bv_page; | |
1548 | s = sbio->bi_io_vec[j].bv_page; | |
1549 | if (memcmp(page_address(p), | |
1550 | page_address(s), | |
1551 | PAGE_SIZE)) | |
1552 | break; | |
69382e85 | 1553 | } |
78d7f5f7 N |
1554 | } else |
1555 | j = 0; | |
1556 | if (j >= 0) | |
1557 | mddev->resync_mismatches += r1_bio->sectors; | |
1558 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) | |
1559 | && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { | |
1560 | /* No need to write to this device. */ | |
1561 | sbio->bi_end_io = NULL; | |
1562 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1563 | continue; | |
1564 | } | |
1565 | /* fixup the bio for reuse */ | |
1566 | sbio->bi_vcnt = vcnt; | |
1567 | sbio->bi_size = r1_bio->sectors << 9; | |
1568 | sbio->bi_idx = 0; | |
1569 | sbio->bi_phys_segments = 0; | |
1570 | sbio->bi_flags &= ~(BIO_POOL_MASK - 1); | |
1571 | sbio->bi_flags |= 1 << BIO_UPTODATE; | |
1572 | sbio->bi_next = NULL; | |
1573 | sbio->bi_sector = r1_bio->sector + | |
1574 | conf->mirrors[i].rdev->data_offset; | |
1575 | sbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1576 | size = sbio->bi_size; | |
1577 | for (j = 0; j < vcnt ; j++) { | |
1578 | struct bio_vec *bi; | |
1579 | bi = &sbio->bi_io_vec[j]; | |
1580 | bi->bv_offset = 0; | |
1581 | if (size > PAGE_SIZE) | |
1582 | bi->bv_len = PAGE_SIZE; | |
1583 | else | |
1584 | bi->bv_len = size; | |
1585 | size -= PAGE_SIZE; | |
1586 | memcpy(page_address(bi->bv_page), | |
1587 | page_address(pbio->bi_io_vec[j].bv_page), | |
1588 | PAGE_SIZE); | |
69382e85 | 1589 | } |
78d7f5f7 | 1590 | } |
a68e5870 N |
1591 | return 0; |
1592 | } | |
1593 | ||
1594 | static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) | |
1595 | { | |
1596 | conf_t *conf = mddev->private; | |
1597 | int i; | |
1598 | int disks = conf->raid_disks; | |
1599 | struct bio *bio, *wbio; | |
1600 | ||
1601 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1602 | ||
a68e5870 N |
1603 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1604 | /* ouch - failed to read all of that. */ | |
1605 | if (!fix_sync_read_error(r1_bio)) | |
1606 | return; | |
7ca78d57 N |
1607 | |
1608 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1609 | if (process_checks(r1_bio) < 0) | |
1610 | return; | |
d11c171e N |
1611 | /* |
1612 | * schedule writes | |
1613 | */ | |
1da177e4 LT |
1614 | atomic_set(&r1_bio->remaining, 1); |
1615 | for (i = 0; i < disks ; i++) { | |
1616 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
1617 | if (wbio->bi_end_io == NULL || |
1618 | (wbio->bi_end_io == end_sync_read && | |
1619 | (i == r1_bio->read_disk || | |
1620 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
1621 | continue; |
1622 | ||
3e198f78 N |
1623 | wbio->bi_rw = WRITE; |
1624 | wbio->bi_end_io = end_sync_write; | |
1da177e4 LT |
1625 | atomic_inc(&r1_bio->remaining); |
1626 | md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); | |
191ea9b2 | 1627 | |
1da177e4 LT |
1628 | generic_make_request(wbio); |
1629 | } | |
1630 | ||
1631 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 1632 | /* if we're here, all write(s) have completed, so clean up */ |
1da177e4 LT |
1633 | md_done_sync(mddev, r1_bio->sectors, 1); |
1634 | put_buf(r1_bio); | |
1635 | } | |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * This is a kernel thread which: | |
1640 | * | |
1641 | * 1. Retries failed read operations on working mirrors. | |
1642 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 1643 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
1644 | */ |
1645 | ||
867868fb N |
1646 | static void fix_read_error(conf_t *conf, int read_disk, |
1647 | sector_t sect, int sectors) | |
1648 | { | |
1649 | mddev_t *mddev = conf->mddev; | |
1650 | while(sectors) { | |
1651 | int s = sectors; | |
1652 | int d = read_disk; | |
1653 | int success = 0; | |
1654 | int start; | |
1655 | mdk_rdev_t *rdev; | |
1656 | ||
1657 | if (s > (PAGE_SIZE>>9)) | |
1658 | s = PAGE_SIZE >> 9; | |
1659 | ||
1660 | do { | |
1661 | /* Note: no rcu protection needed here | |
1662 | * as this is synchronous in the raid1d thread | |
1663 | * which is the thread that might remove | |
1664 | * a device. If raid1d ever becomes multi-threaded.... | |
1665 | */ | |
d2eb35ac N |
1666 | sector_t first_bad; |
1667 | int bad_sectors; | |
1668 | ||
867868fb N |
1669 | rdev = conf->mirrors[d].rdev; |
1670 | if (rdev && | |
1671 | test_bit(In_sync, &rdev->flags) && | |
d2eb35ac N |
1672 | is_badblock(rdev, sect, s, |
1673 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
1674 | sync_page_io(rdev, sect, s<<9, |
1675 | conf->tmppage, READ, false)) | |
867868fb N |
1676 | success = 1; |
1677 | else { | |
1678 | d++; | |
1679 | if (d == conf->raid_disks) | |
1680 | d = 0; | |
1681 | } | |
1682 | } while (!success && d != read_disk); | |
1683 | ||
1684 | if (!success) { | |
1685 | /* Cannot read from anywhere -- bye bye array */ | |
1686 | md_error(mddev, conf->mirrors[read_disk].rdev); | |
1687 | break; | |
1688 | } | |
1689 | /* write it back and re-read */ | |
1690 | start = d; | |
1691 | while (d != read_disk) { | |
1692 | if (d==0) | |
1693 | d = conf->raid_disks; | |
1694 | d--; | |
1695 | rdev = conf->mirrors[d].rdev; | |
1696 | if (rdev && | |
1697 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1698 | if (sync_page_io(rdev, sect, s<<9, |
1699 | conf->tmppage, WRITE, false) | |
867868fb N |
1700 | == 0) |
1701 | /* Well, this device is dead */ | |
1702 | md_error(mddev, rdev); | |
1703 | } | |
1704 | } | |
1705 | d = start; | |
1706 | while (d != read_disk) { | |
1707 | char b[BDEVNAME_SIZE]; | |
1708 | if (d==0) | |
1709 | d = conf->raid_disks; | |
1710 | d--; | |
1711 | rdev = conf->mirrors[d].rdev; | |
1712 | if (rdev && | |
1713 | test_bit(In_sync, &rdev->flags)) { | |
ccebd4c4 JB |
1714 | if (sync_page_io(rdev, sect, s<<9, |
1715 | conf->tmppage, READ, false) | |
867868fb N |
1716 | == 0) |
1717 | /* Well, this device is dead */ | |
1718 | md_error(mddev, rdev); | |
1719 | else { | |
1720 | atomic_add(s, &rdev->corrected_errors); | |
1721 | printk(KERN_INFO | |
9dd1e2fa | 1722 | "md/raid1:%s: read error corrected " |
867868fb N |
1723 | "(%d sectors at %llu on %s)\n", |
1724 | mdname(mddev), s, | |
969b755a RD |
1725 | (unsigned long long)(sect + |
1726 | rdev->data_offset), | |
867868fb N |
1727 | bdevname(rdev->bdev, b)); |
1728 | } | |
1729 | } | |
1730 | } | |
1731 | sectors -= s; | |
1732 | sect += s; | |
1733 | } | |
1734 | } | |
1735 | ||
cd5ff9a1 N |
1736 | static void bi_complete(struct bio *bio, int error) |
1737 | { | |
1738 | complete((struct completion *)bio->bi_private); | |
1739 | } | |
1740 | ||
1741 | static int submit_bio_wait(int rw, struct bio *bio) | |
1742 | { | |
1743 | struct completion event; | |
1744 | rw |= REQ_SYNC; | |
1745 | ||
1746 | init_completion(&event); | |
1747 | bio->bi_private = &event; | |
1748 | bio->bi_end_io = bi_complete; | |
1749 | submit_bio(rw, bio); | |
1750 | wait_for_completion(&event); | |
1751 | ||
1752 | return test_bit(BIO_UPTODATE, &bio->bi_flags); | |
1753 | } | |
1754 | ||
1755 | static int narrow_write_error(r1bio_t *r1_bio, int i) | |
1756 | { | |
1757 | mddev_t *mddev = r1_bio->mddev; | |
1758 | conf_t *conf = mddev->private; | |
1759 | mdk_rdev_t *rdev = conf->mirrors[i].rdev; | |
1760 | int vcnt, idx; | |
1761 | struct bio_vec *vec; | |
1762 | ||
1763 | /* bio has the data to be written to device 'i' where | |
1764 | * we just recently had a write error. | |
1765 | * We repeatedly clone the bio and trim down to one block, | |
1766 | * then try the write. Where the write fails we record | |
1767 | * a bad block. | |
1768 | * It is conceivable that the bio doesn't exactly align with | |
1769 | * blocks. We must handle this somehow. | |
1770 | * | |
1771 | * We currently own a reference on the rdev. | |
1772 | */ | |
1773 | ||
1774 | int block_sectors; | |
1775 | sector_t sector; | |
1776 | int sectors; | |
1777 | int sect_to_write = r1_bio->sectors; | |
1778 | int ok = 1; | |
1779 | ||
1780 | if (rdev->badblocks.shift < 0) | |
1781 | return 0; | |
1782 | ||
1783 | block_sectors = 1 << rdev->badblocks.shift; | |
1784 | sector = r1_bio->sector; | |
1785 | sectors = ((sector + block_sectors) | |
1786 | & ~(sector_t)(block_sectors - 1)) | |
1787 | - sector; | |
1788 | ||
1789 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
1790 | vcnt = r1_bio->behind_page_count; | |
1791 | vec = r1_bio->behind_bvecs; | |
1792 | idx = 0; | |
1793 | while (vec[idx].bv_page == NULL) | |
1794 | idx++; | |
1795 | } else { | |
1796 | vcnt = r1_bio->master_bio->bi_vcnt; | |
1797 | vec = r1_bio->master_bio->bi_io_vec; | |
1798 | idx = r1_bio->master_bio->bi_idx; | |
1799 | } | |
1800 | while (sect_to_write) { | |
1801 | struct bio *wbio; | |
1802 | if (sectors > sect_to_write) | |
1803 | sectors = sect_to_write; | |
1804 | /* Write at 'sector' for 'sectors'*/ | |
1805 | ||
1806 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
1807 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
1808 | wbio->bi_sector = r1_bio->sector; | |
1809 | wbio->bi_rw = WRITE; | |
1810 | wbio->bi_vcnt = vcnt; | |
1811 | wbio->bi_size = r1_bio->sectors << 9; | |
1812 | wbio->bi_idx = idx; | |
1813 | ||
1814 | md_trim_bio(wbio, sector - r1_bio->sector, sectors); | |
1815 | wbio->bi_sector += rdev->data_offset; | |
1816 | wbio->bi_bdev = rdev->bdev; | |
1817 | if (submit_bio_wait(WRITE, wbio) == 0) | |
1818 | /* failure! */ | |
1819 | ok = rdev_set_badblocks(rdev, sector, | |
1820 | sectors, 0) | |
1821 | && ok; | |
1822 | ||
1823 | bio_put(wbio); | |
1824 | sect_to_write -= sectors; | |
1825 | sector += sectors; | |
1826 | sectors = block_sectors; | |
1827 | } | |
1828 | return ok; | |
1829 | } | |
1830 | ||
1da177e4 LT |
1831 | static void raid1d(mddev_t *mddev) |
1832 | { | |
1833 | r1bio_t *r1_bio; | |
1834 | struct bio *bio; | |
1835 | unsigned long flags; | |
070ec55d | 1836 | conf_t *conf = mddev->private; |
1da177e4 | 1837 | struct list_head *head = &conf->retry_list; |
1da177e4 | 1838 | mdk_rdev_t *rdev; |
e1dfa0a2 | 1839 | struct blk_plug plug; |
1da177e4 LT |
1840 | |
1841 | md_check_recovery(mddev); | |
e1dfa0a2 N |
1842 | |
1843 | blk_start_plug(&plug); | |
1da177e4 LT |
1844 | for (;;) { |
1845 | char b[BDEVNAME_SIZE]; | |
191ea9b2 | 1846 | |
c3b328ac N |
1847 | if (atomic_read(&mddev->plug_cnt) == 0) |
1848 | flush_pending_writes(conf); | |
191ea9b2 | 1849 | |
a35e63ef N |
1850 | spin_lock_irqsave(&conf->device_lock, flags); |
1851 | if (list_empty(head)) { | |
1852 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 1853 | break; |
a35e63ef | 1854 | } |
1da177e4 LT |
1855 | r1_bio = list_entry(head->prev, r1bio_t, retry_list); |
1856 | list_del(head->prev); | |
ddaf22ab | 1857 | conf->nr_queued--; |
1da177e4 LT |
1858 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1859 | ||
1860 | mddev = r1_bio->mddev; | |
070ec55d | 1861 | conf = mddev->private; |
4367af55 N |
1862 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
1863 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
1864 | int m; | |
1865 | int s = r1_bio->sectors; | |
1866 | for (m = 0; m < conf->raid_disks ; m++) { | |
1867 | struct bio *bio = r1_bio->bios[m]; | |
1868 | if (bio->bi_end_io != NULL && | |
1869 | test_bit(BIO_UPTODATE, | |
1870 | &bio->bi_flags)) { | |
1871 | rdev = conf->mirrors[m].rdev; | |
1872 | rdev_clear_badblocks( | |
1873 | rdev, | |
1874 | r1_bio->sector, | |
1875 | r1_bio->sectors); | |
1876 | } | |
1877 | } | |
1878 | put_buf(r1_bio); | |
1879 | md_done_sync(mddev, s, 1); | |
1880 | } else | |
1881 | sync_request_write(mddev, r1_bio); | |
cd5ff9a1 N |
1882 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1883 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
4367af55 N |
1884 | int m; |
1885 | for (m = 0; m < conf->raid_disks ; m++) | |
1886 | if (r1_bio->bios[m] == IO_MADE_GOOD) { | |
1887 | rdev = conf->mirrors[m].rdev; | |
1888 | rdev_clear_badblocks( | |
1889 | rdev, | |
1890 | r1_bio->sector, | |
1891 | r1_bio->sectors); | |
1892 | rdev_dec_pending(rdev, mddev); | |
cd5ff9a1 N |
1893 | } else if (r1_bio->bios[m] != NULL) { |
1894 | /* This drive got a write error. We | |
1895 | * need to narrow down and record | |
1896 | * precise write errors. | |
1897 | */ | |
1898 | if (!narrow_write_error(r1_bio, m)) { | |
1899 | md_error(mddev, | |
1900 | conf->mirrors[m].rdev); | |
1901 | /* an I/O failed, we can't clear | |
1902 | * the bitmap */ | |
1903 | set_bit(R1BIO_Degraded, | |
1904 | &r1_bio->state); | |
1905 | } | |
1906 | rdev_dec_pending(conf->mirrors[m].rdev, | |
1907 | mddev); | |
4367af55 | 1908 | } |
cd5ff9a1 N |
1909 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) |
1910 | close_write(r1_bio); | |
4367af55 N |
1911 | raid_end_bio_io(r1_bio); |
1912 | } else if (test_bit(R1BIO_ReadError, &r1_bio->state)) { | |
1da177e4 | 1913 | int disk; |
d2eb35ac | 1914 | int max_sectors; |
ddaf22ab | 1915 | |
d2eb35ac | 1916 | clear_bit(R1BIO_ReadError, &r1_bio->state); |
ddaf22ab N |
1917 | /* we got a read error. Maybe the drive is bad. Maybe just |
1918 | * the block and we can fix it. | |
1919 | * We freeze all other IO, and try reading the block from | |
1920 | * other devices. When we find one, we re-write | |
1921 | * and check it that fixes the read error. | |
1922 | * This is all done synchronously while the array is | |
1923 | * frozen | |
1924 | */ | |
867868fb N |
1925 | if (mddev->ro == 0) { |
1926 | freeze_array(conf); | |
1927 | fix_read_error(conf, r1_bio->read_disk, | |
1928 | r1_bio->sector, | |
1929 | r1_bio->sectors); | |
1930 | unfreeze_array(conf); | |
d0e26078 N |
1931 | } else |
1932 | md_error(mddev, | |
1933 | conf->mirrors[r1_bio->read_disk].rdev); | |
ddaf22ab | 1934 | |
1da177e4 | 1935 | bio = r1_bio->bios[r1_bio->read_disk]; |
d2eb35ac N |
1936 | bdevname(bio->bi_bdev, b); |
1937 | read_more: | |
1938 | disk = read_balance(conf, r1_bio, &max_sectors); | |
1939 | if (disk == -1) { | |
9dd1e2fa | 1940 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" |
1da177e4 | 1941 | " read error for block %llu\n", |
d2eb35ac | 1942 | mdname(mddev), b, |
1da177e4 LT |
1943 | (unsigned long long)r1_bio->sector); |
1944 | raid_end_bio_io(r1_bio); | |
1945 | } else { | |
2c7d46ec | 1946 | const unsigned long do_sync = r1_bio->master_bio->bi_rw & REQ_SYNC; |
d2eb35ac N |
1947 | if (bio) { |
1948 | r1_bio->bios[r1_bio->read_disk] = | |
1949 | mddev->ro ? IO_BLOCKED : NULL; | |
1950 | bio_put(bio); | |
1951 | } | |
1da177e4 | 1952 | r1_bio->read_disk = disk; |
a167f663 N |
1953 | bio = bio_clone_mddev(r1_bio->master_bio, |
1954 | GFP_NOIO, mddev); | |
d2eb35ac N |
1955 | md_trim_bio(bio, |
1956 | r1_bio->sector - bio->bi_sector, | |
1957 | max_sectors); | |
1da177e4 LT |
1958 | r1_bio->bios[r1_bio->read_disk] = bio; |
1959 | rdev = conf->mirrors[disk].rdev; | |
8bda470e CD |
1960 | printk_ratelimited( |
1961 | KERN_ERR | |
1962 | "md/raid1:%s: redirecting sector %llu" | |
1963 | " to other mirror: %s\n", | |
1964 | mdname(mddev), | |
1965 | (unsigned long long)r1_bio->sector, | |
1966 | bdevname(rdev->bdev, b)); | |
1da177e4 LT |
1967 | bio->bi_sector = r1_bio->sector + rdev->data_offset; |
1968 | bio->bi_bdev = rdev->bdev; | |
1969 | bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1970 | bio->bi_rw = READ | do_sync; |
1da177e4 | 1971 | bio->bi_private = r1_bio; |
d2eb35ac N |
1972 | if (max_sectors < r1_bio->sectors) { |
1973 | /* Drat - have to split this up more */ | |
1974 | struct bio *mbio = r1_bio->master_bio; | |
1975 | int sectors_handled = | |
1976 | r1_bio->sector + max_sectors | |
1977 | - mbio->bi_sector; | |
1978 | r1_bio->sectors = max_sectors; | |
1979 | spin_lock_irq(&conf->device_lock); | |
1980 | if (mbio->bi_phys_segments == 0) | |
1981 | mbio->bi_phys_segments = 2; | |
1982 | else | |
1983 | mbio->bi_phys_segments++; | |
1984 | spin_unlock_irq(&conf->device_lock); | |
1985 | generic_make_request(bio); | |
1986 | bio = NULL; | |
1987 | ||
1988 | r1_bio = mempool_alloc(conf->r1bio_pool, | |
1989 | GFP_NOIO); | |
1990 | ||
1991 | r1_bio->master_bio = mbio; | |
1992 | r1_bio->sectors = (mbio->bi_size >> 9) | |
1993 | - sectors_handled; | |
1994 | r1_bio->state = 0; | |
1995 | set_bit(R1BIO_ReadError, | |
1996 | &r1_bio->state); | |
1997 | r1_bio->mddev = mddev; | |
1998 | r1_bio->sector = mbio->bi_sector | |
1999 | + sectors_handled; | |
2000 | ||
2001 | goto read_more; | |
2002 | } else | |
2003 | generic_make_request(bio); | |
1da177e4 | 2004 | } |
d2eb35ac N |
2005 | } else { |
2006 | /* just a partial read to be scheduled from separate | |
2007 | * context | |
2008 | */ | |
2009 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
1da177e4 | 2010 | } |
1d9d5241 | 2011 | cond_resched(); |
de393cde N |
2012 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2013 | md_check_recovery(mddev); | |
1da177e4 | 2014 | } |
e1dfa0a2 | 2015 | blk_finish_plug(&plug); |
1da177e4 LT |
2016 | } |
2017 | ||
2018 | ||
2019 | static int init_resync(conf_t *conf) | |
2020 | { | |
2021 | int buffs; | |
2022 | ||
2023 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2024 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2025 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2026 | conf->poolinfo); | |
2027 | if (!conf->r1buf_pool) | |
2028 | return -ENOMEM; | |
2029 | conf->next_resync = 0; | |
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * perform a "sync" on one "block" | |
2035 | * | |
2036 | * We need to make sure that no normal I/O request - particularly write | |
2037 | * requests - conflict with active sync requests. | |
2038 | * | |
2039 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2040 | * that can be installed to exclude normal IO requests. | |
2041 | */ | |
2042 | ||
57afd89f | 2043 | static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2044 | { |
070ec55d | 2045 | conf_t *conf = mddev->private; |
1da177e4 LT |
2046 | r1bio_t *r1_bio; |
2047 | struct bio *bio; | |
2048 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2049 | int disk = -1; |
1da177e4 | 2050 | int i; |
3e198f78 N |
2051 | int wonly = -1; |
2052 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2053 | sector_t sync_blocks; |
e3b9703e | 2054 | int still_degraded = 0; |
06f60385 N |
2055 | int good_sectors = RESYNC_SECTORS; |
2056 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2057 | |
2058 | if (!conf->r1buf_pool) | |
2059 | if (init_resync(conf)) | |
57afd89f | 2060 | return 0; |
1da177e4 | 2061 | |
58c0fed4 | 2062 | max_sector = mddev->dev_sectors; |
1da177e4 | 2063 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2064 | /* If we aborted, we need to abort the |
2065 | * sync on the 'current' bitmap chunk (there will | |
2066 | * only be one in raid1 resync. | |
2067 | * We can find the current addess in mddev->curr_resync | |
2068 | */ | |
6a806c51 N |
2069 | if (mddev->curr_resync < max_sector) /* aborted */ |
2070 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2071 | &sync_blocks, 1); |
6a806c51 | 2072 | else /* completed sync */ |
191ea9b2 | 2073 | conf->fullsync = 0; |
6a806c51 N |
2074 | |
2075 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2076 | close_sync(conf); |
2077 | return 0; | |
2078 | } | |
2079 | ||
07d84d10 N |
2080 | if (mddev->bitmap == NULL && |
2081 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2082 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2083 | conf->fullsync == 0) { |
2084 | *skipped = 1; | |
2085 | return max_sector - sector_nr; | |
2086 | } | |
6394cca5 N |
2087 | /* before building a request, check if we can skip these blocks.. |
2088 | * This call the bitmap_start_sync doesn't actually record anything | |
2089 | */ | |
e3b9703e | 2090 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2091 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2092 | /* We can skip this block, and probably several more */ |
2093 | *skipped = 1; | |
2094 | return sync_blocks; | |
2095 | } | |
1da177e4 | 2096 | /* |
17999be4 N |
2097 | * If there is non-resync activity waiting for a turn, |
2098 | * and resync is going fast enough, | |
2099 | * then let it though before starting on this new sync request. | |
1da177e4 | 2100 | */ |
17999be4 | 2101 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2102 | msleep_interruptible(1000); |
17999be4 | 2103 | |
b47490c9 | 2104 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2105 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 N |
2106 | raise_barrier(conf); |
2107 | ||
2108 | conf->next_resync = sector_nr; | |
1da177e4 | 2109 | |
3e198f78 | 2110 | rcu_read_lock(); |
1da177e4 | 2111 | /* |
3e198f78 N |
2112 | * If we get a correctably read error during resync or recovery, |
2113 | * we might want to read from a different device. So we | |
2114 | * flag all drives that could conceivably be read from for READ, | |
2115 | * and any others (which will be non-In_sync devices) for WRITE. | |
2116 | * If a read fails, we try reading from something else for which READ | |
2117 | * is OK. | |
1da177e4 | 2118 | */ |
1da177e4 | 2119 | |
1da177e4 LT |
2120 | r1_bio->mddev = mddev; |
2121 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2122 | r1_bio->state = 0; |
1da177e4 | 2123 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 LT |
2124 | |
2125 | for (i=0; i < conf->raid_disks; i++) { | |
3e198f78 | 2126 | mdk_rdev_t *rdev; |
1da177e4 LT |
2127 | bio = r1_bio->bios[i]; |
2128 | ||
2129 | /* take from bio_init */ | |
2130 | bio->bi_next = NULL; | |
db8d9d35 | 2131 | bio->bi_flags &= ~(BIO_POOL_MASK-1); |
1da177e4 | 2132 | bio->bi_flags |= 1 << BIO_UPTODATE; |
db8d9d35 | 2133 | bio->bi_comp_cpu = -1; |
802ba064 | 2134 | bio->bi_rw = READ; |
1da177e4 LT |
2135 | bio->bi_vcnt = 0; |
2136 | bio->bi_idx = 0; | |
2137 | bio->bi_phys_segments = 0; | |
1da177e4 LT |
2138 | bio->bi_size = 0; |
2139 | bio->bi_end_io = NULL; | |
2140 | bio->bi_private = NULL; | |
2141 | ||
3e198f78 N |
2142 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2143 | if (rdev == NULL || | |
06f60385 | 2144 | test_bit(Faulty, &rdev->flags)) { |
e3b9703e | 2145 | still_degraded = 1; |
3e198f78 | 2146 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2147 | bio->bi_rw = WRITE; |
2148 | bio->bi_end_io = end_sync_write; | |
2149 | write_targets ++; | |
3e198f78 N |
2150 | } else { |
2151 | /* may need to read from here */ | |
06f60385 N |
2152 | sector_t first_bad = MaxSector; |
2153 | int bad_sectors; | |
2154 | ||
2155 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2156 | &first_bad, &bad_sectors)) { | |
2157 | if (first_bad > sector_nr) | |
2158 | good_sectors = first_bad - sector_nr; | |
2159 | else { | |
2160 | bad_sectors -= (sector_nr - first_bad); | |
2161 | if (min_bad == 0 || | |
2162 | min_bad > bad_sectors) | |
2163 | min_bad = bad_sectors; | |
2164 | } | |
2165 | } | |
2166 | if (sector_nr < first_bad) { | |
2167 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2168 | if (wonly < 0) | |
2169 | wonly = i; | |
2170 | } else { | |
2171 | if (disk < 0) | |
2172 | disk = i; | |
2173 | } | |
2174 | bio->bi_rw = READ; | |
2175 | bio->bi_end_io = end_sync_read; | |
2176 | read_targets++; | |
3e198f78 | 2177 | } |
3e198f78 | 2178 | } |
06f60385 N |
2179 | if (bio->bi_end_io) { |
2180 | atomic_inc(&rdev->nr_pending); | |
2181 | bio->bi_sector = sector_nr + rdev->data_offset; | |
2182 | bio->bi_bdev = rdev->bdev; | |
2183 | bio->bi_private = r1_bio; | |
2184 | } | |
1da177e4 | 2185 | } |
3e198f78 N |
2186 | rcu_read_unlock(); |
2187 | if (disk < 0) | |
2188 | disk = wonly; | |
2189 | r1_bio->read_disk = disk; | |
191ea9b2 | 2190 | |
06f60385 N |
2191 | if (read_targets == 0 && min_bad > 0) { |
2192 | /* These sectors are bad on all InSync devices, so we | |
2193 | * need to mark them bad on all write targets | |
2194 | */ | |
2195 | int ok = 1; | |
2196 | for (i = 0 ; i < conf->raid_disks ; i++) | |
2197 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { | |
2198 | mdk_rdev_t *rdev = | |
2199 | rcu_dereference(conf->mirrors[i].rdev); | |
2200 | ok = rdev_set_badblocks(rdev, sector_nr, | |
2201 | min_bad, 0 | |
2202 | ) && ok; | |
2203 | } | |
2204 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2205 | *skipped = 1; | |
2206 | put_buf(r1_bio); | |
2207 | ||
2208 | if (!ok) { | |
2209 | /* Cannot record the badblocks, so need to | |
2210 | * abort the resync. | |
2211 | * If there are multiple read targets, could just | |
2212 | * fail the really bad ones ??? | |
2213 | */ | |
2214 | conf->recovery_disabled = mddev->recovery_disabled; | |
2215 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2216 | return 0; | |
2217 | } else | |
2218 | return min_bad; | |
2219 | ||
2220 | } | |
2221 | if (min_bad > 0 && min_bad < good_sectors) { | |
2222 | /* only resync enough to reach the next bad->good | |
2223 | * transition */ | |
2224 | good_sectors = min_bad; | |
2225 | } | |
2226 | ||
3e198f78 N |
2227 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2228 | /* extra read targets are also write targets */ | |
2229 | write_targets += read_targets-1; | |
2230 | ||
2231 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2232 | /* There is nowhere to write, so all non-sync |
2233 | * drives must be failed - so we are finished | |
2234 | */ | |
57afd89f N |
2235 | sector_t rv = max_sector - sector_nr; |
2236 | *skipped = 1; | |
1da177e4 | 2237 | put_buf(r1_bio); |
1da177e4 LT |
2238 | return rv; |
2239 | } | |
2240 | ||
c6207277 N |
2241 | if (max_sector > mddev->resync_max) |
2242 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2243 | if (max_sector > sector_nr + good_sectors) |
2244 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2245 | nr_sectors = 0; |
289e99e8 | 2246 | sync_blocks = 0; |
1da177e4 LT |
2247 | do { |
2248 | struct page *page; | |
2249 | int len = PAGE_SIZE; | |
2250 | if (sector_nr + (len>>9) > max_sector) | |
2251 | len = (max_sector - sector_nr) << 9; | |
2252 | if (len == 0) | |
2253 | break; | |
6a806c51 N |
2254 | if (sync_blocks == 0) { |
2255 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2256 | &sync_blocks, still_degraded) && |
2257 | !conf->fullsync && | |
2258 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2259 | break; |
9e77c485 | 2260 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2261 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2262 | len = sync_blocks<<9; |
ab7a30c7 | 2263 | } |
191ea9b2 | 2264 | |
1da177e4 LT |
2265 | for (i=0 ; i < conf->raid_disks; i++) { |
2266 | bio = r1_bio->bios[i]; | |
2267 | if (bio->bi_end_io) { | |
d11c171e | 2268 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2269 | if (bio_add_page(bio, page, len, 0) == 0) { |
2270 | /* stop here */ | |
d11c171e | 2271 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2272 | while (i > 0) { |
2273 | i--; | |
2274 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2275 | if (bio->bi_end_io==NULL) |
2276 | continue; | |
1da177e4 LT |
2277 | /* remove last page from this bio */ |
2278 | bio->bi_vcnt--; | |
2279 | bio->bi_size -= len; | |
2280 | bio->bi_flags &= ~(1<< BIO_SEG_VALID); | |
2281 | } | |
2282 | goto bio_full; | |
2283 | } | |
2284 | } | |
2285 | } | |
2286 | nr_sectors += len>>9; | |
2287 | sector_nr += len>>9; | |
191ea9b2 | 2288 | sync_blocks -= (len>>9); |
1da177e4 LT |
2289 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2290 | bio_full: | |
1da177e4 LT |
2291 | r1_bio->sectors = nr_sectors; |
2292 | ||
d11c171e N |
2293 | /* For a user-requested sync, we read all readable devices and do a |
2294 | * compare | |
2295 | */ | |
2296 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2297 | atomic_set(&r1_bio->remaining, read_targets); | |
2298 | for (i=0; i<conf->raid_disks; i++) { | |
2299 | bio = r1_bio->bios[i]; | |
2300 | if (bio->bi_end_io == end_sync_read) { | |
ddac7c7e | 2301 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2302 | generic_make_request(bio); |
2303 | } | |
2304 | } | |
2305 | } else { | |
2306 | atomic_set(&r1_bio->remaining, 1); | |
2307 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2308 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2309 | generic_make_request(bio); |
1da177e4 | 2310 | |
d11c171e | 2311 | } |
1da177e4 LT |
2312 | return nr_sectors; |
2313 | } | |
2314 | ||
80c3a6ce DW |
2315 | static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) |
2316 | { | |
2317 | if (sectors) | |
2318 | return sectors; | |
2319 | ||
2320 | return mddev->dev_sectors; | |
2321 | } | |
2322 | ||
709ae487 | 2323 | static conf_t *setup_conf(mddev_t *mddev) |
1da177e4 LT |
2324 | { |
2325 | conf_t *conf; | |
709ae487 | 2326 | int i; |
1da177e4 LT |
2327 | mirror_info_t *disk; |
2328 | mdk_rdev_t *rdev; | |
709ae487 | 2329 | int err = -ENOMEM; |
1da177e4 | 2330 | |
9ffae0cf | 2331 | conf = kzalloc(sizeof(conf_t), GFP_KERNEL); |
1da177e4 | 2332 | if (!conf) |
709ae487 | 2333 | goto abort; |
1da177e4 | 2334 | |
9ffae0cf | 2335 | conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, |
1da177e4 LT |
2336 | GFP_KERNEL); |
2337 | if (!conf->mirrors) | |
709ae487 | 2338 | goto abort; |
1da177e4 | 2339 | |
ddaf22ab N |
2340 | conf->tmppage = alloc_page(GFP_KERNEL); |
2341 | if (!conf->tmppage) | |
709ae487 | 2342 | goto abort; |
ddaf22ab | 2343 | |
709ae487 | 2344 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2345 | if (!conf->poolinfo) |
709ae487 | 2346 | goto abort; |
1da177e4 LT |
2347 | conf->poolinfo->raid_disks = mddev->raid_disks; |
2348 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2349 | r1bio_pool_free, | |
2350 | conf->poolinfo); | |
2351 | if (!conf->r1bio_pool) | |
709ae487 N |
2352 | goto abort; |
2353 | ||
ed9bfdf1 | 2354 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2355 | |
e7e72bf6 | 2356 | spin_lock_init(&conf->device_lock); |
159ec1fc | 2357 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
709ae487 | 2358 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2359 | if (disk_idx >= mddev->raid_disks |
2360 | || disk_idx < 0) | |
2361 | continue; | |
2362 | disk = conf->mirrors + disk_idx; | |
2363 | ||
2364 | disk->rdev = rdev; | |
1da177e4 LT |
2365 | |
2366 | disk->head_position = 0; | |
1da177e4 LT |
2367 | } |
2368 | conf->raid_disks = mddev->raid_disks; | |
2369 | conf->mddev = mddev; | |
1da177e4 | 2370 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2371 | |
2372 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2373 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2374 | |
191ea9b2 | 2375 | bio_list_init(&conf->pending_bio_list); |
191ea9b2 | 2376 | |
709ae487 | 2377 | conf->last_used = -1; |
1da177e4 LT |
2378 | for (i = 0; i < conf->raid_disks; i++) { |
2379 | ||
2380 | disk = conf->mirrors + i; | |
2381 | ||
5fd6c1dc N |
2382 | if (!disk->rdev || |
2383 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2384 | disk->head_position = 0; |
918f0238 N |
2385 | if (disk->rdev) |
2386 | conf->fullsync = 1; | |
709ae487 N |
2387 | } else if (conf->last_used < 0) |
2388 | /* | |
2389 | * The first working device is used as a | |
2390 | * starting point to read balancing. | |
2391 | */ | |
2392 | conf->last_used = i; | |
1da177e4 | 2393 | } |
709ae487 N |
2394 | |
2395 | err = -EIO; | |
2396 | if (conf->last_used < 0) { | |
9dd1e2fa | 2397 | printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", |
709ae487 N |
2398 | mdname(mddev)); |
2399 | goto abort; | |
2400 | } | |
2401 | err = -ENOMEM; | |
2402 | conf->thread = md_register_thread(raid1d, mddev, NULL); | |
2403 | if (!conf->thread) { | |
2404 | printk(KERN_ERR | |
9dd1e2fa | 2405 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2406 | mdname(mddev)); |
2407 | goto abort; | |
11ce99e6 | 2408 | } |
1da177e4 | 2409 | |
709ae487 N |
2410 | return conf; |
2411 | ||
2412 | abort: | |
2413 | if (conf) { | |
2414 | if (conf->r1bio_pool) | |
2415 | mempool_destroy(conf->r1bio_pool); | |
2416 | kfree(conf->mirrors); | |
2417 | safe_put_page(conf->tmppage); | |
2418 | kfree(conf->poolinfo); | |
2419 | kfree(conf); | |
2420 | } | |
2421 | return ERR_PTR(err); | |
2422 | } | |
2423 | ||
2424 | static int run(mddev_t *mddev) | |
2425 | { | |
2426 | conf_t *conf; | |
2427 | int i; | |
2428 | mdk_rdev_t *rdev; | |
2429 | ||
2430 | if (mddev->level != 1) { | |
9dd1e2fa | 2431 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2432 | mdname(mddev), mddev->level); |
2433 | return -EIO; | |
2434 | } | |
2435 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2436 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2437 | mdname(mddev)); |
2438 | return -EIO; | |
2439 | } | |
1da177e4 | 2440 | /* |
709ae487 N |
2441 | * copy the already verified devices into our private RAID1 |
2442 | * bookkeeping area. [whatever we allocate in run(), | |
2443 | * should be freed in stop()] | |
1da177e4 | 2444 | */ |
709ae487 N |
2445 | if (mddev->private == NULL) |
2446 | conf = setup_conf(mddev); | |
2447 | else | |
2448 | conf = mddev->private; | |
1da177e4 | 2449 | |
709ae487 N |
2450 | if (IS_ERR(conf)) |
2451 | return PTR_ERR(conf); | |
1da177e4 | 2452 | |
709ae487 | 2453 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1ed7242e JB |
2454 | if (!mddev->gendisk) |
2455 | continue; | |
709ae487 N |
2456 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2457 | rdev->data_offset << 9); | |
2458 | /* as we don't honour merge_bvec_fn, we must never risk | |
627a2d3c N |
2459 | * violating it, so limit ->max_segments to 1 lying within |
2460 | * a single page, as a one page request is never in violation. | |
709ae487 | 2461 | */ |
627a2d3c N |
2462 | if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { |
2463 | blk_queue_max_segments(mddev->queue, 1); | |
2464 | blk_queue_segment_boundary(mddev->queue, | |
2465 | PAGE_CACHE_SIZE - 1); | |
2466 | } | |
1da177e4 | 2467 | } |
191ea9b2 | 2468 | |
709ae487 N |
2469 | mddev->degraded = 0; |
2470 | for (i=0; i < conf->raid_disks; i++) | |
2471 | if (conf->mirrors[i].rdev == NULL || | |
2472 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2473 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2474 | mddev->degraded++; | |
2475 | ||
2476 | if (conf->raid_disks - mddev->degraded == 1) | |
2477 | mddev->recovery_cp = MaxSector; | |
2478 | ||
8c6ac868 | 2479 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2480 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2481 | " -- starting background reconstruction\n", |
2482 | mdname(mddev)); | |
1da177e4 | 2483 | printk(KERN_INFO |
9dd1e2fa | 2484 | "md/raid1:%s: active with %d out of %d mirrors\n", |
1da177e4 LT |
2485 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
2486 | mddev->raid_disks); | |
709ae487 | 2487 | |
1da177e4 LT |
2488 | /* |
2489 | * Ok, everything is just fine now | |
2490 | */ | |
709ae487 N |
2491 | mddev->thread = conf->thread; |
2492 | conf->thread = NULL; | |
2493 | mddev->private = conf; | |
2494 | ||
1f403624 | 2495 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2496 | |
1ed7242e JB |
2497 | if (mddev->queue) { |
2498 | mddev->queue->backing_dev_info.congested_fn = raid1_congested; | |
2499 | mddev->queue->backing_dev_info.congested_data = mddev; | |
2500 | } | |
a91a2785 | 2501 | return md_integrity_register(mddev); |
1da177e4 LT |
2502 | } |
2503 | ||
2504 | static int stop(mddev_t *mddev) | |
2505 | { | |
070ec55d | 2506 | conf_t *conf = mddev->private; |
4b6d287f | 2507 | struct bitmap *bitmap = mddev->bitmap; |
4b6d287f N |
2508 | |
2509 | /* wait for behind writes to complete */ | |
e555190d | 2510 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { |
9dd1e2fa N |
2511 | printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", |
2512 | mdname(mddev)); | |
4b6d287f | 2513 | /* need to kick something here to make sure I/O goes? */ |
e555190d N |
2514 | wait_event(bitmap->behind_wait, |
2515 | atomic_read(&bitmap->behind_writes) == 0); | |
4b6d287f | 2516 | } |
1da177e4 | 2517 | |
409c57f3 N |
2518 | raise_barrier(conf); |
2519 | lower_barrier(conf); | |
2520 | ||
1da177e4 LT |
2521 | md_unregister_thread(mddev->thread); |
2522 | mddev->thread = NULL; | |
1da177e4 LT |
2523 | if (conf->r1bio_pool) |
2524 | mempool_destroy(conf->r1bio_pool); | |
990a8baf JJ |
2525 | kfree(conf->mirrors); |
2526 | kfree(conf->poolinfo); | |
1da177e4 LT |
2527 | kfree(conf); |
2528 | mddev->private = NULL; | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | static int raid1_resize(mddev_t *mddev, sector_t sectors) | |
2533 | { | |
2534 | /* no resync is happening, and there is enough space | |
2535 | * on all devices, so we can resize. | |
2536 | * We need to make sure resync covers any new space. | |
2537 | * If the array is shrinking we should possibly wait until | |
2538 | * any io in the removed space completes, but it hardly seems | |
2539 | * worth it. | |
2540 | */ | |
1f403624 | 2541 | md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); |
b522adcd DW |
2542 | if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) |
2543 | return -EINVAL; | |
f233ea5c | 2544 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 2545 | revalidate_disk(mddev->gendisk); |
b522adcd | 2546 | if (sectors > mddev->dev_sectors && |
b098636c | 2547 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 2548 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
2549 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2550 | } | |
b522adcd | 2551 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 2552 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
2553 | return 0; |
2554 | } | |
2555 | ||
63c70c4f | 2556 | static int raid1_reshape(mddev_t *mddev) |
1da177e4 LT |
2557 | { |
2558 | /* We need to: | |
2559 | * 1/ resize the r1bio_pool | |
2560 | * 2/ resize conf->mirrors | |
2561 | * | |
2562 | * We allocate a new r1bio_pool if we can. | |
2563 | * Then raise a device barrier and wait until all IO stops. | |
2564 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
2565 | * |
2566 | * At the same time, we "pack" the devices so that all the missing | |
2567 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
2568 | */ |
2569 | mempool_t *newpool, *oldpool; | |
2570 | struct pool_info *newpoolinfo; | |
2571 | mirror_info_t *newmirrors; | |
070ec55d | 2572 | conf_t *conf = mddev->private; |
63c70c4f | 2573 | int cnt, raid_disks; |
c04be0aa | 2574 | unsigned long flags; |
b5470dc5 | 2575 | int d, d2, err; |
1da177e4 | 2576 | |
63c70c4f | 2577 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 2578 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
2579 | mddev->layout != mddev->new_layout || |
2580 | mddev->level != mddev->new_level) { | |
664e7c41 | 2581 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
2582 | mddev->new_layout = mddev->layout; |
2583 | mddev->new_level = mddev->level; | |
2584 | return -EINVAL; | |
2585 | } | |
2586 | ||
b5470dc5 DW |
2587 | err = md_allow_write(mddev); |
2588 | if (err) | |
2589 | return err; | |
2a2275d6 | 2590 | |
63c70c4f N |
2591 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
2592 | ||
6ea9c07c N |
2593 | if (raid_disks < conf->raid_disks) { |
2594 | cnt=0; | |
2595 | for (d= 0; d < conf->raid_disks; d++) | |
2596 | if (conf->mirrors[d].rdev) | |
2597 | cnt++; | |
2598 | if (cnt > raid_disks) | |
1da177e4 | 2599 | return -EBUSY; |
6ea9c07c | 2600 | } |
1da177e4 LT |
2601 | |
2602 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
2603 | if (!newpoolinfo) | |
2604 | return -ENOMEM; | |
2605 | newpoolinfo->mddev = mddev; | |
2606 | newpoolinfo->raid_disks = raid_disks; | |
2607 | ||
2608 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
2609 | r1bio_pool_free, newpoolinfo); | |
2610 | if (!newpool) { | |
2611 | kfree(newpoolinfo); | |
2612 | return -ENOMEM; | |
2613 | } | |
9ffae0cf | 2614 | newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); |
1da177e4 LT |
2615 | if (!newmirrors) { |
2616 | kfree(newpoolinfo); | |
2617 | mempool_destroy(newpool); | |
2618 | return -ENOMEM; | |
2619 | } | |
1da177e4 | 2620 | |
17999be4 | 2621 | raise_barrier(conf); |
1da177e4 LT |
2622 | |
2623 | /* ok, everything is stopped */ | |
2624 | oldpool = conf->r1bio_pool; | |
2625 | conf->r1bio_pool = newpool; | |
6ea9c07c | 2626 | |
a88aa786 N |
2627 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
2628 | mdk_rdev_t *rdev = conf->mirrors[d].rdev; | |
2629 | if (rdev && rdev->raid_disk != d2) { | |
36fad858 | 2630 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 2631 | rdev->raid_disk = d2; |
36fad858 NK |
2632 | sysfs_unlink_rdev(mddev, rdev); |
2633 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 2634 | printk(KERN_WARNING |
36fad858 NK |
2635 | "md/raid1:%s: cannot register rd%d\n", |
2636 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 2637 | } |
a88aa786 N |
2638 | if (rdev) |
2639 | newmirrors[d2++].rdev = rdev; | |
2640 | } | |
1da177e4 LT |
2641 | kfree(conf->mirrors); |
2642 | conf->mirrors = newmirrors; | |
2643 | kfree(conf->poolinfo); | |
2644 | conf->poolinfo = newpoolinfo; | |
2645 | ||
c04be0aa | 2646 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 2647 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 2648 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 2649 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 2650 | mddev->delta_disks = 0; |
1da177e4 | 2651 | |
6ea9c07c | 2652 | conf->last_used = 0; /* just make sure it is in-range */ |
17999be4 | 2653 | lower_barrier(conf); |
1da177e4 LT |
2654 | |
2655 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2656 | md_wakeup_thread(mddev->thread); | |
2657 | ||
2658 | mempool_destroy(oldpool); | |
2659 | return 0; | |
2660 | } | |
2661 | ||
500af87a | 2662 | static void raid1_quiesce(mddev_t *mddev, int state) |
36fa3063 | 2663 | { |
070ec55d | 2664 | conf_t *conf = mddev->private; |
36fa3063 N |
2665 | |
2666 | switch(state) { | |
6eef4b21 N |
2667 | case 2: /* wake for suspend */ |
2668 | wake_up(&conf->wait_barrier); | |
2669 | break; | |
9e6603da | 2670 | case 1: |
17999be4 | 2671 | raise_barrier(conf); |
36fa3063 | 2672 | break; |
9e6603da | 2673 | case 0: |
17999be4 | 2674 | lower_barrier(conf); |
36fa3063 N |
2675 | break; |
2676 | } | |
36fa3063 N |
2677 | } |
2678 | ||
709ae487 N |
2679 | static void *raid1_takeover(mddev_t *mddev) |
2680 | { | |
2681 | /* raid1 can take over: | |
2682 | * raid5 with 2 devices, any layout or chunk size | |
2683 | */ | |
2684 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
2685 | conf_t *conf; | |
2686 | mddev->new_level = 1; | |
2687 | mddev->new_layout = 0; | |
2688 | mddev->new_chunk_sectors = 0; | |
2689 | conf = setup_conf(mddev); | |
2690 | if (!IS_ERR(conf)) | |
2691 | conf->barrier = 1; | |
2692 | return conf; | |
2693 | } | |
2694 | return ERR_PTR(-EINVAL); | |
2695 | } | |
1da177e4 | 2696 | |
2604b703 | 2697 | static struct mdk_personality raid1_personality = |
1da177e4 LT |
2698 | { |
2699 | .name = "raid1", | |
2604b703 | 2700 | .level = 1, |
1da177e4 LT |
2701 | .owner = THIS_MODULE, |
2702 | .make_request = make_request, | |
2703 | .run = run, | |
2704 | .stop = stop, | |
2705 | .status = status, | |
2706 | .error_handler = error, | |
2707 | .hot_add_disk = raid1_add_disk, | |
2708 | .hot_remove_disk= raid1_remove_disk, | |
2709 | .spare_active = raid1_spare_active, | |
2710 | .sync_request = sync_request, | |
2711 | .resize = raid1_resize, | |
80c3a6ce | 2712 | .size = raid1_size, |
63c70c4f | 2713 | .check_reshape = raid1_reshape, |
36fa3063 | 2714 | .quiesce = raid1_quiesce, |
709ae487 | 2715 | .takeover = raid1_takeover, |
1da177e4 LT |
2716 | }; |
2717 | ||
2718 | static int __init raid_init(void) | |
2719 | { | |
2604b703 | 2720 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
2721 | } |
2722 | ||
2723 | static void raid_exit(void) | |
2724 | { | |
2604b703 | 2725 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
2726 | } |
2727 | ||
2728 | module_init(raid_init); | |
2729 | module_exit(raid_exit); | |
2730 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 2731 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 2732 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 2733 | MODULE_ALIAS("md-raid1"); |
2604b703 | 2734 | MODULE_ALIAS("md-level-1"); |