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1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
056075c7 | 37 | #include <linux/module.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
8bda470e | 39 | #include <linux/ratelimit.h> |
43b2e5d8 | 40 | #include "md.h" |
ef740c37 CH |
41 | #include "raid1.h" |
42 | #include "bitmap.h" | |
191ea9b2 | 43 | |
1da177e4 LT |
44 | /* |
45 | * Number of guaranteed r1bios in case of extreme VM load: | |
46 | */ | |
47 | #define NR_RAID1_BIOS 256 | |
48 | ||
473e87ce JB |
49 | /* when we get a read error on a read-only array, we redirect to another |
50 | * device without failing the first device, or trying to over-write to | |
51 | * correct the read error. To keep track of bad blocks on a per-bio | |
52 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
53 | */ | |
54 | #define IO_BLOCKED ((struct bio *)1) | |
55 | /* When we successfully write to a known bad-block, we need to remove the | |
56 | * bad-block marking which must be done from process context. So we record | |
57 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
58 | */ | |
59 | #define IO_MADE_GOOD ((struct bio *)2) | |
60 | ||
61 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
62 | ||
34db0cd6 N |
63 | /* When there are this many requests queue to be written by |
64 | * the raid1 thread, we become 'congested' to provide back-pressure | |
65 | * for writeback. | |
66 | */ | |
67 | static int max_queued_requests = 1024; | |
1da177e4 | 68 | |
79ef3a8a | 69 | static void allow_barrier(struct r1conf *conf, sector_t start_next_window, |
70 | sector_t bi_sector); | |
e8096360 | 71 | static void lower_barrier(struct r1conf *conf); |
1da177e4 | 72 | |
dd0fc66f | 73 | static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
74 | { |
75 | struct pool_info *pi = data; | |
9f2c9d12 | 76 | int size = offsetof(struct r1bio, bios[pi->raid_disks]); |
1da177e4 LT |
77 | |
78 | /* allocate a r1bio with room for raid_disks entries in the bios array */ | |
7eaceacc | 79 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
80 | } |
81 | ||
82 | static void r1bio_pool_free(void *r1_bio, void *data) | |
83 | { | |
84 | kfree(r1_bio); | |
85 | } | |
86 | ||
87 | #define RESYNC_BLOCK_SIZE (64*1024) | |
8e005f7c | 88 | #define RESYNC_DEPTH 32 |
1da177e4 LT |
89 | #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) |
90 | #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) | |
8e005f7c | 91 | #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) |
92 | #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) | |
93 | #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS) | |
1da177e4 | 94 | |
dd0fc66f | 95 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
96 | { |
97 | struct pool_info *pi = data; | |
9f2c9d12 | 98 | struct r1bio *r1_bio; |
1da177e4 | 99 | struct bio *bio; |
da1aab3d | 100 | int need_pages; |
1da177e4 LT |
101 | int i, j; |
102 | ||
103 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 104 | if (!r1_bio) |
1da177e4 | 105 | return NULL; |
1da177e4 LT |
106 | |
107 | /* | |
108 | * Allocate bios : 1 for reading, n-1 for writing | |
109 | */ | |
110 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 111 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
112 | if (!bio) |
113 | goto out_free_bio; | |
114 | r1_bio->bios[j] = bio; | |
115 | } | |
116 | /* | |
117 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
118 | * the first bio. |
119 | * If this is a user-requested check/repair, allocate | |
120 | * RESYNC_PAGES for each bio. | |
1da177e4 | 121 | */ |
d11c171e | 122 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 123 | need_pages = pi->raid_disks; |
d11c171e | 124 | else |
da1aab3d N |
125 | need_pages = 1; |
126 | for (j = 0; j < need_pages; j++) { | |
d11c171e | 127 | bio = r1_bio->bios[j]; |
a0787606 | 128 | bio->bi_vcnt = RESYNC_PAGES; |
d11c171e | 129 | |
a0787606 | 130 | if (bio_alloc_pages(bio, gfp_flags)) |
da1aab3d | 131 | goto out_free_pages; |
d11c171e N |
132 | } |
133 | /* If not user-requests, copy the page pointers to all bios */ | |
134 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
135 | for (i=0; i<RESYNC_PAGES ; i++) | |
136 | for (j=1; j<pi->raid_disks; j++) | |
137 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
138 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
139 | } |
140 | ||
141 | r1_bio->master_bio = NULL; | |
142 | ||
143 | return r1_bio; | |
144 | ||
da1aab3d N |
145 | out_free_pages: |
146 | while (--j >= 0) { | |
147 | struct bio_vec *bv; | |
148 | ||
149 | bio_for_each_segment_all(bv, r1_bio->bios[j], i) | |
150 | __free_page(bv->bv_page); | |
151 | } | |
152 | ||
1da177e4 | 153 | out_free_bio: |
8f19ccb2 | 154 | while (++j < pi->raid_disks) |
1da177e4 LT |
155 | bio_put(r1_bio->bios[j]); |
156 | r1bio_pool_free(r1_bio, data); | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
161 | { | |
162 | struct pool_info *pi = data; | |
d11c171e | 163 | int i,j; |
9f2c9d12 | 164 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 165 | |
d11c171e N |
166 | for (i = 0; i < RESYNC_PAGES; i++) |
167 | for (j = pi->raid_disks; j-- ;) { | |
168 | if (j == 0 || | |
169 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
170 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 171 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 172 | } |
1da177e4 LT |
173 | for (i=0 ; i < pi->raid_disks; i++) |
174 | bio_put(r1bio->bios[i]); | |
175 | ||
176 | r1bio_pool_free(r1bio, data); | |
177 | } | |
178 | ||
e8096360 | 179 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
180 | { |
181 | int i; | |
182 | ||
8f19ccb2 | 183 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 184 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 185 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
186 | bio_put(*bio); |
187 | *bio = NULL; | |
188 | } | |
189 | } | |
190 | ||
9f2c9d12 | 191 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 192 | { |
e8096360 | 193 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 194 | |
1da177e4 LT |
195 | put_all_bios(conf, r1_bio); |
196 | mempool_free(r1_bio, conf->r1bio_pool); | |
197 | } | |
198 | ||
9f2c9d12 | 199 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 200 | { |
e8096360 | 201 | struct r1conf *conf = r1_bio->mddev->private; |
3e198f78 N |
202 | int i; |
203 | ||
8f19ccb2 | 204 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
205 | struct bio *bio = r1_bio->bios[i]; |
206 | if (bio->bi_end_io) | |
207 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
208 | } | |
1da177e4 LT |
209 | |
210 | mempool_free(r1_bio, conf->r1buf_pool); | |
211 | ||
17999be4 | 212 | lower_barrier(conf); |
1da177e4 LT |
213 | } |
214 | ||
9f2c9d12 | 215 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
216 | { |
217 | unsigned long flags; | |
fd01b88c | 218 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 219 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
220 | |
221 | spin_lock_irqsave(&conf->device_lock, flags); | |
222 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 223 | conf->nr_queued ++; |
1da177e4 LT |
224 | spin_unlock_irqrestore(&conf->device_lock, flags); |
225 | ||
17999be4 | 226 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
227 | md_wakeup_thread(mddev->thread); |
228 | } | |
229 | ||
230 | /* | |
231 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
232 | * operation and are ready to return a success/failure code to the buffer | |
233 | * cache layer. | |
234 | */ | |
9f2c9d12 | 235 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
236 | { |
237 | struct bio *bio = r1_bio->master_bio; | |
238 | int done; | |
e8096360 | 239 | struct r1conf *conf = r1_bio->mddev->private; |
79ef3a8a | 240 | sector_t start_next_window = r1_bio->start_next_window; |
4f024f37 | 241 | sector_t bi_sector = bio->bi_iter.bi_sector; |
d2eb35ac N |
242 | |
243 | if (bio->bi_phys_segments) { | |
244 | unsigned long flags; | |
245 | spin_lock_irqsave(&conf->device_lock, flags); | |
246 | bio->bi_phys_segments--; | |
247 | done = (bio->bi_phys_segments == 0); | |
248 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
79ef3a8a | 249 | /* |
250 | * make_request() might be waiting for | |
251 | * bi_phys_segments to decrease | |
252 | */ | |
253 | wake_up(&conf->wait_barrier); | |
d2eb35ac N |
254 | } else |
255 | done = 1; | |
256 | ||
257 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
258 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
259 | if (done) { | |
260 | bio_endio(bio, 0); | |
261 | /* | |
262 | * Wake up any possible resync thread that waits for the device | |
263 | * to go idle. | |
264 | */ | |
79ef3a8a | 265 | allow_barrier(conf, start_next_window, bi_sector); |
d2eb35ac N |
266 | } |
267 | } | |
268 | ||
9f2c9d12 | 269 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
270 | { |
271 | struct bio *bio = r1_bio->master_bio; | |
272 | ||
4b6d287f N |
273 | /* if nobody has done the final endio yet, do it now */ |
274 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
275 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
276 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
277 | (unsigned long long) bio->bi_iter.bi_sector, |
278 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 279 | |
d2eb35ac | 280 | call_bio_endio(r1_bio); |
4b6d287f | 281 | } |
1da177e4 LT |
282 | free_r1bio(r1_bio); |
283 | } | |
284 | ||
285 | /* | |
286 | * Update disk head position estimator based on IRQ completion info. | |
287 | */ | |
9f2c9d12 | 288 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 289 | { |
e8096360 | 290 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
291 | |
292 | conf->mirrors[disk].head_position = | |
293 | r1_bio->sector + (r1_bio->sectors); | |
294 | } | |
295 | ||
ba3ae3be NK |
296 | /* |
297 | * Find the disk number which triggered given bio | |
298 | */ | |
9f2c9d12 | 299 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
300 | { |
301 | int mirror; | |
30194636 N |
302 | struct r1conf *conf = r1_bio->mddev->private; |
303 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 304 | |
8f19ccb2 | 305 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
306 | if (r1_bio->bios[mirror] == bio) |
307 | break; | |
308 | ||
8f19ccb2 | 309 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
310 | update_head_pos(mirror, r1_bio); |
311 | ||
312 | return mirror; | |
313 | } | |
314 | ||
6712ecf8 | 315 | static void raid1_end_read_request(struct bio *bio, int error) |
1da177e4 LT |
316 | { |
317 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 318 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 319 | int mirror; |
e8096360 | 320 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 321 | |
1da177e4 LT |
322 | mirror = r1_bio->read_disk; |
323 | /* | |
324 | * this branch is our 'one mirror IO has finished' event handler: | |
325 | */ | |
ddaf22ab N |
326 | update_head_pos(mirror, r1_bio); |
327 | ||
dd00a99e N |
328 | if (uptodate) |
329 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
330 | else { | |
331 | /* If all other devices have failed, we want to return | |
332 | * the error upwards rather than fail the last device. | |
333 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 334 | */ |
dd00a99e N |
335 | unsigned long flags; |
336 | spin_lock_irqsave(&conf->device_lock, flags); | |
337 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
338 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
339 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) | |
340 | uptodate = 1; | |
341 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
342 | } | |
1da177e4 | 343 | |
7ad4d4a6 | 344 | if (uptodate) { |
1da177e4 | 345 | raid_end_bio_io(r1_bio); |
7ad4d4a6 N |
346 | rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); |
347 | } else { | |
1da177e4 LT |
348 | /* |
349 | * oops, read error: | |
350 | */ | |
351 | char b[BDEVNAME_SIZE]; | |
8bda470e CD |
352 | printk_ratelimited( |
353 | KERN_ERR "md/raid1:%s: %s: " | |
354 | "rescheduling sector %llu\n", | |
355 | mdname(conf->mddev), | |
356 | bdevname(conf->mirrors[mirror].rdev->bdev, | |
357 | b), | |
358 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 359 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 360 | reschedule_retry(r1_bio); |
7ad4d4a6 | 361 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 362 | } |
1da177e4 LT |
363 | } |
364 | ||
9f2c9d12 | 365 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
366 | { |
367 | /* it really is the end of this request */ | |
368 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
369 | /* free extra copy of the data pages */ | |
370 | int i = r1_bio->behind_page_count; | |
371 | while (i--) | |
372 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
373 | kfree(r1_bio->behind_bvecs); | |
374 | r1_bio->behind_bvecs = NULL; | |
375 | } | |
376 | /* clear the bitmap if all writes complete successfully */ | |
377 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
378 | r1_bio->sectors, | |
379 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
380 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
381 | md_write_end(r1_bio->mddev); | |
382 | } | |
383 | ||
9f2c9d12 | 384 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 385 | { |
cd5ff9a1 N |
386 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
387 | return; | |
388 | ||
389 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
390 | reschedule_retry(r1_bio); | |
391 | else { | |
392 | close_write(r1_bio); | |
4367af55 N |
393 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
394 | reschedule_retry(r1_bio); | |
395 | else | |
396 | raid_end_bio_io(r1_bio); | |
4e78064f N |
397 | } |
398 | } | |
399 | ||
6712ecf8 | 400 | static void raid1_end_write_request(struct bio *bio, int error) |
1da177e4 LT |
401 | { |
402 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 403 | struct r1bio *r1_bio = bio->bi_private; |
a9701a30 | 404 | int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 405 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 406 | struct bio *to_put = NULL; |
1da177e4 | 407 | |
ba3ae3be | 408 | mirror = find_bio_disk(r1_bio, bio); |
1da177e4 | 409 | |
e9c7469b TH |
410 | /* |
411 | * 'one mirror IO has finished' event handler: | |
412 | */ | |
e9c7469b | 413 | if (!uptodate) { |
cd5ff9a1 N |
414 | set_bit(WriteErrorSeen, |
415 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
416 | if (!test_and_set_bit(WantReplacement, |
417 | &conf->mirrors[mirror].rdev->flags)) | |
418 | set_bit(MD_RECOVERY_NEEDED, & | |
419 | conf->mddev->recovery); | |
420 | ||
cd5ff9a1 | 421 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 | 422 | } else { |
1da177e4 | 423 | /* |
e9c7469b TH |
424 | * Set R1BIO_Uptodate in our master bio, so that we |
425 | * will return a good error code for to the higher | |
426 | * levels even if IO on some other mirrored buffer | |
427 | * fails. | |
428 | * | |
429 | * The 'master' represents the composite IO operation | |
430 | * to user-side. So if something waits for IO, then it | |
431 | * will wait for the 'master' bio. | |
1da177e4 | 432 | */ |
4367af55 N |
433 | sector_t first_bad; |
434 | int bad_sectors; | |
435 | ||
cd5ff9a1 N |
436 | r1_bio->bios[mirror] = NULL; |
437 | to_put = bio; | |
3056e3ae AL |
438 | /* |
439 | * Do not set R1BIO_Uptodate if the current device is | |
440 | * rebuilding or Faulty. This is because we cannot use | |
441 | * such device for properly reading the data back (we could | |
442 | * potentially use it, if the current write would have felt | |
443 | * before rdev->recovery_offset, but for simplicity we don't | |
444 | * check this here. | |
445 | */ | |
446 | if (test_bit(In_sync, &conf->mirrors[mirror].rdev->flags) && | |
447 | !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)) | |
448 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
e9c7469b | 449 | |
4367af55 N |
450 | /* Maybe we can clear some bad blocks. */ |
451 | if (is_badblock(conf->mirrors[mirror].rdev, | |
452 | r1_bio->sector, r1_bio->sectors, | |
453 | &first_bad, &bad_sectors)) { | |
454 | r1_bio->bios[mirror] = IO_MADE_GOOD; | |
455 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
456 | } | |
457 | } | |
458 | ||
e9c7469b TH |
459 | if (behind) { |
460 | if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) | |
461 | atomic_dec(&r1_bio->behind_remaining); | |
462 | ||
463 | /* | |
464 | * In behind mode, we ACK the master bio once the I/O | |
465 | * has safely reached all non-writemostly | |
466 | * disks. Setting the Returned bit ensures that this | |
467 | * gets done only once -- we don't ever want to return | |
468 | * -EIO here, instead we'll wait | |
469 | */ | |
470 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
471 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
472 | /* Maybe we can return now */ | |
473 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
474 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
475 | pr_debug("raid1: behind end write sectors" |
476 | " %llu-%llu\n", | |
4f024f37 KO |
477 | (unsigned long long) mbio->bi_iter.bi_sector, |
478 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 479 | call_bio_endio(r1_bio); |
4b6d287f N |
480 | } |
481 | } | |
482 | } | |
4367af55 N |
483 | if (r1_bio->bios[mirror] == NULL) |
484 | rdev_dec_pending(conf->mirrors[mirror].rdev, | |
485 | conf->mddev); | |
e9c7469b | 486 | |
1da177e4 | 487 | /* |
1da177e4 LT |
488 | * Let's see if all mirrored write operations have finished |
489 | * already. | |
490 | */ | |
af6d7b76 | 491 | r1_bio_write_done(r1_bio); |
c70810b3 | 492 | |
04b857f7 N |
493 | if (to_put) |
494 | bio_put(to_put); | |
1da177e4 LT |
495 | } |
496 | ||
1da177e4 LT |
497 | /* |
498 | * This routine returns the disk from which the requested read should | |
499 | * be done. There is a per-array 'next expected sequential IO' sector | |
500 | * number - if this matches on the next IO then we use the last disk. | |
501 | * There is also a per-disk 'last know head position' sector that is | |
502 | * maintained from IRQ contexts, both the normal and the resync IO | |
503 | * completion handlers update this position correctly. If there is no | |
504 | * perfect sequential match then we pick the disk whose head is closest. | |
505 | * | |
506 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
507 | * because position is mirror, not device based. | |
508 | * | |
509 | * The rdev for the device selected will have nr_pending incremented. | |
510 | */ | |
e8096360 | 511 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 512 | { |
af3a2cd6 | 513 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
514 | int sectors; |
515 | int best_good_sectors; | |
9dedf603 SL |
516 | int best_disk, best_dist_disk, best_pending_disk; |
517 | int has_nonrot_disk; | |
be4d3280 | 518 | int disk; |
76073054 | 519 | sector_t best_dist; |
9dedf603 | 520 | unsigned int min_pending; |
3cb03002 | 521 | struct md_rdev *rdev; |
f3ac8bf7 | 522 | int choose_first; |
12cee5a8 | 523 | int choose_next_idle; |
1da177e4 LT |
524 | |
525 | rcu_read_lock(); | |
526 | /* | |
8ddf9efe | 527 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
528 | * device if no resync is going on, or below the resync window. |
529 | * We take the first readable disk when above the resync window. | |
530 | */ | |
531 | retry: | |
d2eb35ac | 532 | sectors = r1_bio->sectors; |
76073054 | 533 | best_disk = -1; |
9dedf603 | 534 | best_dist_disk = -1; |
76073054 | 535 | best_dist = MaxSector; |
9dedf603 SL |
536 | best_pending_disk = -1; |
537 | min_pending = UINT_MAX; | |
d2eb35ac | 538 | best_good_sectors = 0; |
9dedf603 | 539 | has_nonrot_disk = 0; |
12cee5a8 | 540 | choose_next_idle = 0; |
d2eb35ac | 541 | |
c6d119cf | 542 | choose_first = (conf->mddev->recovery_cp < this_sector + sectors); |
1da177e4 | 543 | |
be4d3280 | 544 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 545 | sector_t dist; |
d2eb35ac N |
546 | sector_t first_bad; |
547 | int bad_sectors; | |
9dedf603 | 548 | unsigned int pending; |
12cee5a8 | 549 | bool nonrot; |
d2eb35ac | 550 | |
f3ac8bf7 N |
551 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
552 | if (r1_bio->bios[disk] == IO_BLOCKED | |
553 | || rdev == NULL | |
6b740b8d | 554 | || test_bit(Unmerged, &rdev->flags) |
76073054 | 555 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 556 | continue; |
76073054 N |
557 | if (!test_bit(In_sync, &rdev->flags) && |
558 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 559 | continue; |
76073054 N |
560 | if (test_bit(WriteMostly, &rdev->flags)) { |
561 | /* Don't balance among write-mostly, just | |
562 | * use the first as a last resort */ | |
307729c8 N |
563 | if (best_disk < 0) { |
564 | if (is_badblock(rdev, this_sector, sectors, | |
565 | &first_bad, &bad_sectors)) { | |
566 | if (first_bad < this_sector) | |
567 | /* Cannot use this */ | |
568 | continue; | |
569 | best_good_sectors = first_bad - this_sector; | |
570 | } else | |
571 | best_good_sectors = sectors; | |
76073054 | 572 | best_disk = disk; |
307729c8 | 573 | } |
76073054 N |
574 | continue; |
575 | } | |
576 | /* This is a reasonable device to use. It might | |
577 | * even be best. | |
578 | */ | |
d2eb35ac N |
579 | if (is_badblock(rdev, this_sector, sectors, |
580 | &first_bad, &bad_sectors)) { | |
581 | if (best_dist < MaxSector) | |
582 | /* already have a better device */ | |
583 | continue; | |
584 | if (first_bad <= this_sector) { | |
585 | /* cannot read here. If this is the 'primary' | |
586 | * device, then we must not read beyond | |
587 | * bad_sectors from another device.. | |
588 | */ | |
589 | bad_sectors -= (this_sector - first_bad); | |
590 | if (choose_first && sectors > bad_sectors) | |
591 | sectors = bad_sectors; | |
592 | if (best_good_sectors > sectors) | |
593 | best_good_sectors = sectors; | |
594 | ||
595 | } else { | |
596 | sector_t good_sectors = first_bad - this_sector; | |
597 | if (good_sectors > best_good_sectors) { | |
598 | best_good_sectors = good_sectors; | |
599 | best_disk = disk; | |
600 | } | |
601 | if (choose_first) | |
602 | break; | |
603 | } | |
604 | continue; | |
605 | } else | |
606 | best_good_sectors = sectors; | |
607 | ||
12cee5a8 SL |
608 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
609 | has_nonrot_disk |= nonrot; | |
9dedf603 | 610 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 611 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 612 | if (choose_first) { |
76073054 | 613 | best_disk = disk; |
1da177e4 LT |
614 | break; |
615 | } | |
12cee5a8 SL |
616 | /* Don't change to another disk for sequential reads */ |
617 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
618 | || dist == 0) { | |
619 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
620 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
621 | ||
622 | best_disk = disk; | |
623 | /* | |
624 | * If buffered sequential IO size exceeds optimal | |
625 | * iosize, check if there is idle disk. If yes, choose | |
626 | * the idle disk. read_balance could already choose an | |
627 | * idle disk before noticing it's a sequential IO in | |
628 | * this disk. This doesn't matter because this disk | |
629 | * will idle, next time it will be utilized after the | |
630 | * first disk has IO size exceeds optimal iosize. In | |
631 | * this way, iosize of the first disk will be optimal | |
632 | * iosize at least. iosize of the second disk might be | |
633 | * small, but not a big deal since when the second disk | |
634 | * starts IO, the first disk is likely still busy. | |
635 | */ | |
636 | if (nonrot && opt_iosize > 0 && | |
637 | mirror->seq_start != MaxSector && | |
638 | mirror->next_seq_sect > opt_iosize && | |
639 | mirror->next_seq_sect - opt_iosize >= | |
640 | mirror->seq_start) { | |
641 | choose_next_idle = 1; | |
642 | continue; | |
643 | } | |
644 | break; | |
645 | } | |
646 | /* If device is idle, use it */ | |
647 | if (pending == 0) { | |
648 | best_disk = disk; | |
649 | break; | |
650 | } | |
651 | ||
652 | if (choose_next_idle) | |
653 | continue; | |
9dedf603 SL |
654 | |
655 | if (min_pending > pending) { | |
656 | min_pending = pending; | |
657 | best_pending_disk = disk; | |
658 | } | |
659 | ||
76073054 N |
660 | if (dist < best_dist) { |
661 | best_dist = dist; | |
9dedf603 | 662 | best_dist_disk = disk; |
1da177e4 | 663 | } |
f3ac8bf7 | 664 | } |
1da177e4 | 665 | |
9dedf603 SL |
666 | /* |
667 | * If all disks are rotational, choose the closest disk. If any disk is | |
668 | * non-rotational, choose the disk with less pending request even the | |
669 | * disk is rotational, which might/might not be optimal for raids with | |
670 | * mixed ratation/non-rotational disks depending on workload. | |
671 | */ | |
672 | if (best_disk == -1) { | |
673 | if (has_nonrot_disk) | |
674 | best_disk = best_pending_disk; | |
675 | else | |
676 | best_disk = best_dist_disk; | |
677 | } | |
678 | ||
76073054 N |
679 | if (best_disk >= 0) { |
680 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
681 | if (!rdev) |
682 | goto retry; | |
683 | atomic_inc(&rdev->nr_pending); | |
76073054 | 684 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
685 | /* cannot risk returning a device that failed |
686 | * before we inc'ed nr_pending | |
687 | */ | |
03c902e1 | 688 | rdev_dec_pending(rdev, conf->mddev); |
1da177e4 LT |
689 | goto retry; |
690 | } | |
d2eb35ac | 691 | sectors = best_good_sectors; |
12cee5a8 SL |
692 | |
693 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
694 | conf->mirrors[best_disk].seq_start = this_sector; | |
695 | ||
be4d3280 | 696 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
697 | } |
698 | rcu_read_unlock(); | |
d2eb35ac | 699 | *max_sectors = sectors; |
1da177e4 | 700 | |
76073054 | 701 | return best_disk; |
1da177e4 LT |
702 | } |
703 | ||
64590f45 | 704 | static int raid1_mergeable_bvec(struct mddev *mddev, |
6b740b8d N |
705 | struct bvec_merge_data *bvm, |
706 | struct bio_vec *biovec) | |
707 | { | |
6b740b8d N |
708 | struct r1conf *conf = mddev->private; |
709 | sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); | |
710 | int max = biovec->bv_len; | |
711 | ||
712 | if (mddev->merge_check_needed) { | |
713 | int disk; | |
714 | rcu_read_lock(); | |
715 | for (disk = 0; disk < conf->raid_disks * 2; disk++) { | |
716 | struct md_rdev *rdev = rcu_dereference( | |
717 | conf->mirrors[disk].rdev); | |
718 | if (rdev && !test_bit(Faulty, &rdev->flags)) { | |
719 | struct request_queue *q = | |
720 | bdev_get_queue(rdev->bdev); | |
721 | if (q->merge_bvec_fn) { | |
722 | bvm->bi_sector = sector + | |
723 | rdev->data_offset; | |
724 | bvm->bi_bdev = rdev->bdev; | |
725 | max = min(max, q->merge_bvec_fn( | |
726 | q, bvm, biovec)); | |
727 | } | |
728 | } | |
729 | } | |
730 | rcu_read_unlock(); | |
731 | } | |
732 | return max; | |
733 | ||
734 | } | |
735 | ||
5c675f83 | 736 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 737 | { |
e8096360 | 738 | struct r1conf *conf = mddev->private; |
0d129228 N |
739 | int i, ret = 0; |
740 | ||
34db0cd6 N |
741 | if ((bits & (1 << BDI_async_congested)) && |
742 | conf->pending_count >= max_queued_requests) | |
743 | return 1; | |
744 | ||
0d129228 | 745 | rcu_read_lock(); |
f53e29fc | 746 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 747 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 748 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 749 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 750 | |
1ed7242e JB |
751 | BUG_ON(!q); |
752 | ||
0d129228 N |
753 | /* Note the '|| 1' - when read_balance prefers |
754 | * non-congested targets, it can be removed | |
755 | */ | |
91a9e99d | 756 | if ((bits & (1<<BDI_async_congested)) || 1) |
0d129228 N |
757 | ret |= bdi_congested(&q->backing_dev_info, bits); |
758 | else | |
759 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
760 | } | |
761 | } | |
762 | rcu_read_unlock(); | |
763 | return ret; | |
764 | } | |
0d129228 | 765 | |
e8096360 | 766 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
767 | { |
768 | /* Any writes that have been queued but are awaiting | |
769 | * bitmap updates get flushed here. | |
a35e63ef | 770 | */ |
a35e63ef N |
771 | spin_lock_irq(&conf->device_lock); |
772 | ||
773 | if (conf->pending_bio_list.head) { | |
774 | struct bio *bio; | |
775 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 776 | conf->pending_count = 0; |
a35e63ef N |
777 | spin_unlock_irq(&conf->device_lock); |
778 | /* flush any pending bitmap writes to | |
779 | * disk before proceeding w/ I/O */ | |
780 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 781 | wake_up(&conf->wait_barrier); |
a35e63ef N |
782 | |
783 | while (bio) { /* submit pending writes */ | |
784 | struct bio *next = bio->bi_next; | |
785 | bio->bi_next = NULL; | |
2ff8cc2c SL |
786 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
787 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
788 | /* Just ignore it */ | |
789 | bio_endio(bio, 0); | |
790 | else | |
791 | generic_make_request(bio); | |
a35e63ef N |
792 | bio = next; |
793 | } | |
a35e63ef N |
794 | } else |
795 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
796 | } |
797 | ||
17999be4 N |
798 | /* Barriers.... |
799 | * Sometimes we need to suspend IO while we do something else, | |
800 | * either some resync/recovery, or reconfigure the array. | |
801 | * To do this we raise a 'barrier'. | |
802 | * The 'barrier' is a counter that can be raised multiple times | |
803 | * to count how many activities are happening which preclude | |
804 | * normal IO. | |
805 | * We can only raise the barrier if there is no pending IO. | |
806 | * i.e. if nr_pending == 0. | |
807 | * We choose only to raise the barrier if no-one is waiting for the | |
808 | * barrier to go down. This means that as soon as an IO request | |
809 | * is ready, no other operations which require a barrier will start | |
810 | * until the IO request has had a chance. | |
811 | * | |
812 | * So: regular IO calls 'wait_barrier'. When that returns there | |
813 | * is no backgroup IO happening, It must arrange to call | |
814 | * allow_barrier when it has finished its IO. | |
815 | * backgroup IO calls must call raise_barrier. Once that returns | |
816 | * there is no normal IO happeing. It must arrange to call | |
817 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 818 | */ |
c2fd4c94 | 819 | static void raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 LT |
820 | { |
821 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
822 | |
823 | /* Wait until no block IO is waiting */ | |
824 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
eed8c02e | 825 | conf->resync_lock); |
17999be4 N |
826 | |
827 | /* block any new IO from starting */ | |
828 | conf->barrier++; | |
c2fd4c94 | 829 | conf->next_resync = sector_nr; |
17999be4 | 830 | |
79ef3a8a | 831 | /* For these conditions we must wait: |
832 | * A: while the array is in frozen state | |
833 | * B: while barrier >= RESYNC_DEPTH, meaning resync reach | |
834 | * the max count which allowed. | |
835 | * C: next_resync + RESYNC_SECTORS > start_next_window, meaning | |
836 | * next resync will reach to the window which normal bios are | |
837 | * handling. | |
2f73d3c5 | 838 | * D: while there are any active requests in the current window. |
79ef3a8a | 839 | */ |
17999be4 | 840 | wait_event_lock_irq(conf->wait_barrier, |
b364e3d0 | 841 | !conf->array_frozen && |
79ef3a8a | 842 | conf->barrier < RESYNC_DEPTH && |
2f73d3c5 | 843 | conf->current_window_requests == 0 && |
79ef3a8a | 844 | (conf->start_next_window >= |
845 | conf->next_resync + RESYNC_SECTORS), | |
eed8c02e | 846 | conf->resync_lock); |
17999be4 | 847 | |
34e97f17 | 848 | conf->nr_pending++; |
17999be4 N |
849 | spin_unlock_irq(&conf->resync_lock); |
850 | } | |
851 | ||
e8096360 | 852 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
853 | { |
854 | unsigned long flags; | |
709ae487 | 855 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
856 | spin_lock_irqsave(&conf->resync_lock, flags); |
857 | conf->barrier--; | |
34e97f17 | 858 | conf->nr_pending--; |
17999be4 N |
859 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
860 | wake_up(&conf->wait_barrier); | |
861 | } | |
862 | ||
79ef3a8a | 863 | static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio) |
17999be4 | 864 | { |
79ef3a8a | 865 | bool wait = false; |
866 | ||
867 | if (conf->array_frozen || !bio) | |
868 | wait = true; | |
869 | else if (conf->barrier && bio_data_dir(bio) == WRITE) { | |
23554960 N |
870 | if ((conf->mddev->curr_resync_completed |
871 | >= bio_end_sector(bio)) || | |
872 | (conf->next_resync + NEXT_NORMALIO_DISTANCE | |
873 | <= bio->bi_iter.bi_sector)) | |
79ef3a8a | 874 | wait = false; |
875 | else | |
876 | wait = true; | |
877 | } | |
878 | ||
879 | return wait; | |
880 | } | |
881 | ||
882 | static sector_t wait_barrier(struct r1conf *conf, struct bio *bio) | |
883 | { | |
884 | sector_t sector = 0; | |
885 | ||
17999be4 | 886 | spin_lock_irq(&conf->resync_lock); |
79ef3a8a | 887 | if (need_to_wait_for_sync(conf, bio)) { |
17999be4 | 888 | conf->nr_waiting++; |
d6b42dcb N |
889 | /* Wait for the barrier to drop. |
890 | * However if there are already pending | |
891 | * requests (preventing the barrier from | |
892 | * rising completely), and the | |
5965b642 | 893 | * per-process bio queue isn't empty, |
d6b42dcb | 894 | * then don't wait, as we need to empty |
5965b642 N |
895 | * that queue to allow conf->start_next_window |
896 | * to increase. | |
d6b42dcb N |
897 | */ |
898 | wait_event_lock_irq(conf->wait_barrier, | |
b364e3d0 | 899 | !conf->array_frozen && |
900 | (!conf->barrier || | |
5965b642 N |
901 | ((conf->start_next_window < |
902 | conf->next_resync + RESYNC_SECTORS) && | |
903 | current->bio_list && | |
904 | !bio_list_empty(current->bio_list))), | |
eed8c02e | 905 | conf->resync_lock); |
17999be4 | 906 | conf->nr_waiting--; |
1da177e4 | 907 | } |
79ef3a8a | 908 | |
909 | if (bio && bio_data_dir(bio) == WRITE) { | |
2f73d3c5 | 910 | if (bio->bi_iter.bi_sector >= |
23554960 | 911 | conf->mddev->curr_resync_completed) { |
79ef3a8a | 912 | if (conf->start_next_window == MaxSector) |
913 | conf->start_next_window = | |
914 | conf->next_resync + | |
915 | NEXT_NORMALIO_DISTANCE; | |
916 | ||
917 | if ((conf->start_next_window + NEXT_NORMALIO_DISTANCE) | |
4f024f37 | 918 | <= bio->bi_iter.bi_sector) |
79ef3a8a | 919 | conf->next_window_requests++; |
920 | else | |
921 | conf->current_window_requests++; | |
79ef3a8a | 922 | sector = conf->start_next_window; |
41a336e0 | 923 | } |
79ef3a8a | 924 | } |
925 | ||
17999be4 | 926 | conf->nr_pending++; |
1da177e4 | 927 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 928 | return sector; |
1da177e4 LT |
929 | } |
930 | ||
79ef3a8a | 931 | static void allow_barrier(struct r1conf *conf, sector_t start_next_window, |
932 | sector_t bi_sector) | |
17999be4 N |
933 | { |
934 | unsigned long flags; | |
79ef3a8a | 935 | |
17999be4 N |
936 | spin_lock_irqsave(&conf->resync_lock, flags); |
937 | conf->nr_pending--; | |
79ef3a8a | 938 | if (start_next_window) { |
939 | if (start_next_window == conf->start_next_window) { | |
940 | if (conf->start_next_window + NEXT_NORMALIO_DISTANCE | |
941 | <= bi_sector) | |
942 | conf->next_window_requests--; | |
943 | else | |
944 | conf->current_window_requests--; | |
945 | } else | |
946 | conf->current_window_requests--; | |
947 | ||
948 | if (!conf->current_window_requests) { | |
949 | if (conf->next_window_requests) { | |
950 | conf->current_window_requests = | |
951 | conf->next_window_requests; | |
952 | conf->next_window_requests = 0; | |
953 | conf->start_next_window += | |
954 | NEXT_NORMALIO_DISTANCE; | |
955 | } else | |
956 | conf->start_next_window = MaxSector; | |
957 | } | |
958 | } | |
17999be4 N |
959 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
960 | wake_up(&conf->wait_barrier); | |
961 | } | |
962 | ||
e2d59925 | 963 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab N |
964 | { |
965 | /* stop syncio and normal IO and wait for everything to | |
966 | * go quite. | |
b364e3d0 | 967 | * We wait until nr_pending match nr_queued+extra |
1c830532 N |
968 | * This is called in the context of one normal IO request |
969 | * that has failed. Thus any sync request that might be pending | |
970 | * will be blocked by nr_pending, and we need to wait for | |
971 | * pending IO requests to complete or be queued for re-try. | |
e2d59925 | 972 | * Thus the number queued (nr_queued) plus this request (extra) |
1c830532 N |
973 | * must match the number of pending IOs (nr_pending) before |
974 | * we continue. | |
ddaf22ab N |
975 | */ |
976 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 977 | conf->array_frozen = 1; |
eed8c02e | 978 | wait_event_lock_irq_cmd(conf->wait_barrier, |
e2d59925 | 979 | conf->nr_pending == conf->nr_queued+extra, |
eed8c02e LC |
980 | conf->resync_lock, |
981 | flush_pending_writes(conf)); | |
ddaf22ab N |
982 | spin_unlock_irq(&conf->resync_lock); |
983 | } | |
e8096360 | 984 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
985 | { |
986 | /* reverse the effect of the freeze */ | |
987 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 988 | conf->array_frozen = 0; |
ddaf22ab N |
989 | wake_up(&conf->wait_barrier); |
990 | spin_unlock_irq(&conf->resync_lock); | |
991 | } | |
992 | ||
f72ffdd6 | 993 | /* duplicate the data pages for behind I/O |
4e78064f | 994 | */ |
9f2c9d12 | 995 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
996 | { |
997 | int i; | |
998 | struct bio_vec *bvec; | |
2ca68f5e | 999 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 1000 | GFP_NOIO); |
2ca68f5e | 1001 | if (unlikely(!bvecs)) |
af6d7b76 | 1002 | return; |
4b6d287f | 1003 | |
cb34e057 | 1004 | bio_for_each_segment_all(bvec, bio, i) { |
2ca68f5e N |
1005 | bvecs[i] = *bvec; |
1006 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
1007 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 1008 | goto do_sync_io; |
2ca68f5e N |
1009 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
1010 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
1011 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
1012 | kunmap(bvec->bv_page); |
1013 | } | |
2ca68f5e | 1014 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
1015 | r1_bio->behind_page_count = bio->bi_vcnt; |
1016 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
1017 | return; | |
4b6d287f N |
1018 | |
1019 | do_sync_io: | |
af6d7b76 | 1020 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
1021 | if (bvecs[i].bv_page) |
1022 | put_page(bvecs[i].bv_page); | |
1023 | kfree(bvecs); | |
4f024f37 KO |
1024 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
1025 | bio->bi_iter.bi_size); | |
4b6d287f N |
1026 | } |
1027 | ||
f54a9d0e N |
1028 | struct raid1_plug_cb { |
1029 | struct blk_plug_cb cb; | |
1030 | struct bio_list pending; | |
1031 | int pending_cnt; | |
1032 | }; | |
1033 | ||
1034 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1035 | { | |
1036 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
1037 | cb); | |
1038 | struct mddev *mddev = plug->cb.data; | |
1039 | struct r1conf *conf = mddev->private; | |
1040 | struct bio *bio; | |
1041 | ||
874807a8 | 1042 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1043 | spin_lock_irq(&conf->device_lock); |
1044 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1045 | conf->pending_count += plug->pending_cnt; | |
1046 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1047 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1048 | md_wakeup_thread(mddev->thread); |
1049 | kfree(plug); | |
1050 | return; | |
1051 | } | |
1052 | ||
1053 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1054 | bio = bio_list_get(&plug->pending); | |
1055 | bitmap_unplug(mddev->bitmap); | |
1056 | wake_up(&conf->wait_barrier); | |
1057 | ||
1058 | while (bio) { /* submit pending writes */ | |
1059 | struct bio *next = bio->bi_next; | |
1060 | bio->bi_next = NULL; | |
32f9f570 SL |
1061 | if (unlikely((bio->bi_rw & REQ_DISCARD) && |
1062 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
1063 | /* Just ignore it */ | |
1064 | bio_endio(bio, 0); | |
1065 | else | |
1066 | generic_make_request(bio); | |
f54a9d0e N |
1067 | bio = next; |
1068 | } | |
1069 | kfree(plug); | |
1070 | } | |
1071 | ||
b4fdcb02 | 1072 | static void make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 1073 | { |
e8096360 | 1074 | struct r1conf *conf = mddev->private; |
0eaf822c | 1075 | struct raid1_info *mirror; |
9f2c9d12 | 1076 | struct r1bio *r1_bio; |
1da177e4 | 1077 | struct bio *read_bio; |
1f68f0c4 | 1078 | int i, disks; |
84255d10 | 1079 | struct bitmap *bitmap; |
191ea9b2 | 1080 | unsigned long flags; |
a362357b | 1081 | const int rw = bio_data_dir(bio); |
2c7d46ec | 1082 | const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); |
e9c7469b | 1083 | const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); |
2ff8cc2c SL |
1084 | const unsigned long do_discard = (bio->bi_rw |
1085 | & (REQ_DISCARD | REQ_SECURE)); | |
c8dc9c65 | 1086 | const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME); |
3cb03002 | 1087 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1088 | struct blk_plug_cb *cb; |
1089 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 N |
1090 | int first_clone; |
1091 | int sectors_handled; | |
1092 | int max_sectors; | |
79ef3a8a | 1093 | sector_t start_next_window; |
191ea9b2 | 1094 | |
1da177e4 LT |
1095 | /* |
1096 | * Register the new request and wait if the reconstruction | |
1097 | * thread has put up a bar for new requests. | |
1098 | * Continue immediately if no resync is active currently. | |
1099 | */ | |
62de608d | 1100 | |
3d310eb7 N |
1101 | md_write_start(mddev, bio); /* wait on superblock update early */ |
1102 | ||
6eef4b21 | 1103 | if (bio_data_dir(bio) == WRITE && |
589a1c49 GR |
1104 | ((bio_end_sector(bio) > mddev->suspend_lo && |
1105 | bio->bi_iter.bi_sector < mddev->suspend_hi) || | |
1106 | (mddev_is_clustered(mddev) && | |
1107 | md_cluster_ops->area_resyncing(mddev, bio->bi_iter.bi_sector, bio_end_sector(bio))))) { | |
6eef4b21 N |
1108 | /* As the suspend_* range is controlled by |
1109 | * userspace, we want an interruptible | |
1110 | * wait. | |
1111 | */ | |
1112 | DEFINE_WAIT(w); | |
1113 | for (;;) { | |
1114 | flush_signals(current); | |
1115 | prepare_to_wait(&conf->wait_barrier, | |
1116 | &w, TASK_INTERRUPTIBLE); | |
f73a1c7d | 1117 | if (bio_end_sector(bio) <= mddev->suspend_lo || |
589a1c49 GR |
1118 | bio->bi_iter.bi_sector >= mddev->suspend_hi || |
1119 | (mddev_is_clustered(mddev) && | |
1120 | !md_cluster_ops->area_resyncing(mddev, | |
1121 | bio->bi_iter.bi_sector, bio_end_sector(bio)))) | |
6eef4b21 N |
1122 | break; |
1123 | schedule(); | |
1124 | } | |
1125 | finish_wait(&conf->wait_barrier, &w); | |
1126 | } | |
62de608d | 1127 | |
79ef3a8a | 1128 | start_next_window = wait_barrier(conf, bio); |
1da177e4 | 1129 | |
84255d10 N |
1130 | bitmap = mddev->bitmap; |
1131 | ||
1da177e4 LT |
1132 | /* |
1133 | * make_request() can abort the operation when READA is being | |
1134 | * used and no empty request is available. | |
1135 | * | |
1136 | */ | |
1137 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1138 | ||
1139 | r1_bio->master_bio = bio; | |
aa8b57aa | 1140 | r1_bio->sectors = bio_sectors(bio); |
191ea9b2 | 1141 | r1_bio->state = 0; |
1da177e4 | 1142 | r1_bio->mddev = mddev; |
4f024f37 | 1143 | r1_bio->sector = bio->bi_iter.bi_sector; |
1da177e4 | 1144 | |
d2eb35ac N |
1145 | /* We might need to issue multiple reads to different |
1146 | * devices if there are bad blocks around, so we keep | |
1147 | * track of the number of reads in bio->bi_phys_segments. | |
1148 | * If this is 0, there is only one r1_bio and no locking | |
1149 | * will be needed when requests complete. If it is | |
1150 | * non-zero, then it is the number of not-completed requests. | |
1151 | */ | |
1152 | bio->bi_phys_segments = 0; | |
1153 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
1154 | ||
a362357b | 1155 | if (rw == READ) { |
1da177e4 LT |
1156 | /* |
1157 | * read balancing logic: | |
1158 | */ | |
d2eb35ac N |
1159 | int rdisk; |
1160 | ||
1161 | read_again: | |
1162 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
1163 | |
1164 | if (rdisk < 0) { | |
1165 | /* couldn't find anywhere to read from */ | |
1166 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 1167 | return; |
1da177e4 LT |
1168 | } |
1169 | mirror = conf->mirrors + rdisk; | |
1170 | ||
e555190d N |
1171 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1172 | bitmap) { | |
1173 | /* Reading from a write-mostly device must | |
1174 | * take care not to over-take any writes | |
1175 | * that are 'behind' | |
1176 | */ | |
1177 | wait_event(bitmap->behind_wait, | |
1178 | atomic_read(&bitmap->behind_writes) == 0); | |
1179 | } | |
1da177e4 | 1180 | r1_bio->read_disk = rdisk; |
f0cc9a05 | 1181 | r1_bio->start_next_window = 0; |
1da177e4 | 1182 | |
a167f663 | 1183 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
4f024f37 | 1184 | bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, |
6678d83f | 1185 | max_sectors); |
1da177e4 LT |
1186 | |
1187 | r1_bio->bios[rdisk] = read_bio; | |
1188 | ||
4f024f37 KO |
1189 | read_bio->bi_iter.bi_sector = r1_bio->sector + |
1190 | mirror->rdev->data_offset; | |
1da177e4 LT |
1191 | read_bio->bi_bdev = mirror->rdev->bdev; |
1192 | read_bio->bi_end_io = raid1_end_read_request; | |
7b6d91da | 1193 | read_bio->bi_rw = READ | do_sync; |
1da177e4 LT |
1194 | read_bio->bi_private = r1_bio; |
1195 | ||
d2eb35ac N |
1196 | if (max_sectors < r1_bio->sectors) { |
1197 | /* could not read all from this device, so we will | |
1198 | * need another r1_bio. | |
1199 | */ | |
d2eb35ac N |
1200 | |
1201 | sectors_handled = (r1_bio->sector + max_sectors | |
4f024f37 | 1202 | - bio->bi_iter.bi_sector); |
d2eb35ac N |
1203 | r1_bio->sectors = max_sectors; |
1204 | spin_lock_irq(&conf->device_lock); | |
1205 | if (bio->bi_phys_segments == 0) | |
1206 | bio->bi_phys_segments = 2; | |
1207 | else | |
1208 | bio->bi_phys_segments++; | |
1209 | spin_unlock_irq(&conf->device_lock); | |
1210 | /* Cannot call generic_make_request directly | |
1211 | * as that will be queued in __make_request | |
1212 | * and subsequent mempool_alloc might block waiting | |
1213 | * for it. So hand bio over to raid1d. | |
1214 | */ | |
1215 | reschedule_retry(r1_bio); | |
1216 | ||
1217 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1218 | ||
1219 | r1_bio->master_bio = bio; | |
aa8b57aa | 1220 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
d2eb35ac N |
1221 | r1_bio->state = 0; |
1222 | r1_bio->mddev = mddev; | |
4f024f37 KO |
1223 | r1_bio->sector = bio->bi_iter.bi_sector + |
1224 | sectors_handled; | |
d2eb35ac N |
1225 | goto read_again; |
1226 | } else | |
1227 | generic_make_request(read_bio); | |
5a7bbad2 | 1228 | return; |
1da177e4 LT |
1229 | } |
1230 | ||
1231 | /* | |
1232 | * WRITE: | |
1233 | */ | |
34db0cd6 N |
1234 | if (conf->pending_count >= max_queued_requests) { |
1235 | md_wakeup_thread(mddev->thread); | |
1236 | wait_event(conf->wait_barrier, | |
1237 | conf->pending_count < max_queued_requests); | |
1238 | } | |
1f68f0c4 | 1239 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1240 | * inc refcount on their rdev. Record them by setting |
1241 | * bios[x] to bio | |
1f68f0c4 N |
1242 | * If there are known/acknowledged bad blocks on any device on |
1243 | * which we have seen a write error, we want to avoid writing those | |
1244 | * blocks. | |
1245 | * This potentially requires several writes to write around | |
1246 | * the bad blocks. Each set of writes gets it's own r1bio | |
1247 | * with a set of bios attached. | |
1da177e4 | 1248 | */ |
c3b328ac | 1249 | |
8f19ccb2 | 1250 | disks = conf->raid_disks * 2; |
6bfe0b49 | 1251 | retry_write: |
79ef3a8a | 1252 | r1_bio->start_next_window = start_next_window; |
6bfe0b49 | 1253 | blocked_rdev = NULL; |
1da177e4 | 1254 | rcu_read_lock(); |
1f68f0c4 | 1255 | max_sectors = r1_bio->sectors; |
1da177e4 | 1256 | for (i = 0; i < disks; i++) { |
3cb03002 | 1257 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1258 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1259 | atomic_inc(&rdev->nr_pending); | |
1260 | blocked_rdev = rdev; | |
1261 | break; | |
1262 | } | |
1f68f0c4 | 1263 | r1_bio->bios[i] = NULL; |
6b740b8d N |
1264 | if (!rdev || test_bit(Faulty, &rdev->flags) |
1265 | || test_bit(Unmerged, &rdev->flags)) { | |
8f19ccb2 N |
1266 | if (i < conf->raid_disks) |
1267 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1268 | continue; |
1269 | } | |
1270 | ||
1271 | atomic_inc(&rdev->nr_pending); | |
1272 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1273 | sector_t first_bad; | |
1274 | int bad_sectors; | |
1275 | int is_bad; | |
1276 | ||
1277 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1278 | max_sectors, | |
1279 | &first_bad, &bad_sectors); | |
1280 | if (is_bad < 0) { | |
1281 | /* mustn't write here until the bad block is | |
1282 | * acknowledged*/ | |
1283 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1284 | blocked_rdev = rdev; | |
1285 | break; | |
1286 | } | |
1287 | if (is_bad && first_bad <= r1_bio->sector) { | |
1288 | /* Cannot write here at all */ | |
1289 | bad_sectors -= (r1_bio->sector - first_bad); | |
1290 | if (bad_sectors < max_sectors) | |
1291 | /* mustn't write more than bad_sectors | |
1292 | * to other devices yet | |
1293 | */ | |
1294 | max_sectors = bad_sectors; | |
03c902e1 | 1295 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1296 | /* We don't set R1BIO_Degraded as that |
1297 | * only applies if the disk is | |
1298 | * missing, so it might be re-added, | |
1299 | * and we want to know to recover this | |
1300 | * chunk. | |
1301 | * In this case the device is here, | |
1302 | * and the fact that this chunk is not | |
1303 | * in-sync is recorded in the bad | |
1304 | * block log | |
1305 | */ | |
1306 | continue; | |
964147d5 | 1307 | } |
1f68f0c4 N |
1308 | if (is_bad) { |
1309 | int good_sectors = first_bad - r1_bio->sector; | |
1310 | if (good_sectors < max_sectors) | |
1311 | max_sectors = good_sectors; | |
1312 | } | |
1313 | } | |
1314 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1315 | } |
1316 | rcu_read_unlock(); | |
1317 | ||
6bfe0b49 DW |
1318 | if (unlikely(blocked_rdev)) { |
1319 | /* Wait for this device to become unblocked */ | |
1320 | int j; | |
79ef3a8a | 1321 | sector_t old = start_next_window; |
6bfe0b49 DW |
1322 | |
1323 | for (j = 0; j < i; j++) | |
1324 | if (r1_bio->bios[j]) | |
1325 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1326 | r1_bio->state = 0; |
4f024f37 | 1327 | allow_barrier(conf, start_next_window, bio->bi_iter.bi_sector); |
6bfe0b49 | 1328 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
79ef3a8a | 1329 | start_next_window = wait_barrier(conf, bio); |
1330 | /* | |
1331 | * We must make sure the multi r1bios of bio have | |
1332 | * the same value of bi_phys_segments | |
1333 | */ | |
1334 | if (bio->bi_phys_segments && old && | |
1335 | old != start_next_window) | |
1336 | /* Wait for the former r1bio(s) to complete */ | |
1337 | wait_event(conf->wait_barrier, | |
1338 | bio->bi_phys_segments == 1); | |
6bfe0b49 DW |
1339 | goto retry_write; |
1340 | } | |
1341 | ||
1f68f0c4 N |
1342 | if (max_sectors < r1_bio->sectors) { |
1343 | /* We are splitting this write into multiple parts, so | |
1344 | * we need to prepare for allocating another r1_bio. | |
1345 | */ | |
1346 | r1_bio->sectors = max_sectors; | |
1347 | spin_lock_irq(&conf->device_lock); | |
1348 | if (bio->bi_phys_segments == 0) | |
1349 | bio->bi_phys_segments = 2; | |
1350 | else | |
1351 | bio->bi_phys_segments++; | |
1352 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1353 | } |
4f024f37 | 1354 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; |
4b6d287f | 1355 | |
4e78064f | 1356 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1357 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1358 | |
1f68f0c4 | 1359 | first_clone = 1; |
1da177e4 LT |
1360 | for (i = 0; i < disks; i++) { |
1361 | struct bio *mbio; | |
1362 | if (!r1_bio->bios[i]) | |
1363 | continue; | |
1364 | ||
a167f663 | 1365 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
4f024f37 | 1366 | bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector, max_sectors); |
1f68f0c4 N |
1367 | |
1368 | if (first_clone) { | |
1369 | /* do behind I/O ? | |
1370 | * Not if there are too many, or cannot | |
1371 | * allocate memory, or a reader on WriteMostly | |
1372 | * is waiting for behind writes to flush */ | |
1373 | if (bitmap && | |
1374 | (atomic_read(&bitmap->behind_writes) | |
1375 | < mddev->bitmap_info.max_write_behind) && | |
1376 | !waitqueue_active(&bitmap->behind_wait)) | |
1377 | alloc_behind_pages(mbio, r1_bio); | |
1378 | ||
1379 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1380 | r1_bio->sectors, | |
1381 | test_bit(R1BIO_BehindIO, | |
1382 | &r1_bio->state)); | |
1383 | first_clone = 0; | |
1384 | } | |
2ca68f5e | 1385 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1386 | struct bio_vec *bvec; |
1387 | int j; | |
1388 | ||
cb34e057 KO |
1389 | /* |
1390 | * We trimmed the bio, so _all is legit | |
4b6d287f | 1391 | */ |
d74c6d51 | 1392 | bio_for_each_segment_all(bvec, mbio, j) |
2ca68f5e | 1393 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1394 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1395 | atomic_inc(&r1_bio->behind_remaining); | |
1396 | } | |
1397 | ||
1f68f0c4 N |
1398 | r1_bio->bios[i] = mbio; |
1399 | ||
4f024f37 | 1400 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 N |
1401 | conf->mirrors[i].rdev->data_offset); |
1402 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1403 | mbio->bi_end_io = raid1_end_write_request; | |
c8dc9c65 JL |
1404 | mbio->bi_rw = |
1405 | WRITE | do_flush_fua | do_sync | do_discard | do_same; | |
1f68f0c4 N |
1406 | mbio->bi_private = r1_bio; |
1407 | ||
1da177e4 | 1408 | atomic_inc(&r1_bio->remaining); |
f54a9d0e N |
1409 | |
1410 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); | |
1411 | if (cb) | |
1412 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1413 | else | |
1414 | plug = NULL; | |
4e78064f | 1415 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1416 | if (plug) { |
1417 | bio_list_add(&plug->pending, mbio); | |
1418 | plug->pending_cnt++; | |
1419 | } else { | |
1420 | bio_list_add(&conf->pending_bio_list, mbio); | |
1421 | conf->pending_count++; | |
1422 | } | |
4e78064f | 1423 | spin_unlock_irqrestore(&conf->device_lock, flags); |
f54a9d0e | 1424 | if (!plug) |
b357f04a | 1425 | md_wakeup_thread(mddev->thread); |
1da177e4 | 1426 | } |
079fa166 N |
1427 | /* Mustn't call r1_bio_write_done before this next test, |
1428 | * as it could result in the bio being freed. | |
1429 | */ | |
aa8b57aa | 1430 | if (sectors_handled < bio_sectors(bio)) { |
079fa166 | 1431 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1432 | /* We need another r1_bio. It has already been counted |
1433 | * in bio->bi_phys_segments | |
1434 | */ | |
1435 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1436 | r1_bio->master_bio = bio; | |
aa8b57aa | 1437 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
1f68f0c4 N |
1438 | r1_bio->state = 0; |
1439 | r1_bio->mddev = mddev; | |
4f024f37 | 1440 | r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; |
1f68f0c4 N |
1441 | goto retry_write; |
1442 | } | |
1443 | ||
079fa166 N |
1444 | r1_bio_write_done(r1_bio); |
1445 | ||
1446 | /* In case raid1d snuck in to freeze_array */ | |
1447 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1448 | } |
1449 | ||
fd01b88c | 1450 | static void status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1451 | { |
e8096360 | 1452 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1453 | int i; |
1454 | ||
1455 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1456 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1457 | rcu_read_lock(); |
1458 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1459 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1460 | seq_printf(seq, "%s", |
ddac7c7e N |
1461 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1462 | } | |
1463 | rcu_read_unlock(); | |
1da177e4 LT |
1464 | seq_printf(seq, "]"); |
1465 | } | |
1466 | ||
fd01b88c | 1467 | static void error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1468 | { |
1469 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1470 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1471 | |
1472 | /* | |
1473 | * If it is not operational, then we have already marked it as dead | |
1474 | * else if it is the last working disks, ignore the error, let the | |
1475 | * next level up know. | |
1476 | * else mark the drive as failed | |
1477 | */ | |
b2d444d7 | 1478 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1479 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1480 | /* |
1481 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1482 | * normal single drive. |
1483 | * However don't try a recovery from this drive as | |
1484 | * it is very likely to fail. | |
1da177e4 | 1485 | */ |
5389042f | 1486 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1487 | return; |
4044ba58 | 1488 | } |
de393cde | 1489 | set_bit(Blocked, &rdev->flags); |
c04be0aa N |
1490 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1491 | unsigned long flags; | |
1492 | spin_lock_irqsave(&conf->device_lock, flags); | |
1da177e4 | 1493 | mddev->degraded++; |
dd00a99e | 1494 | set_bit(Faulty, &rdev->flags); |
c04be0aa | 1495 | spin_unlock_irqrestore(&conf->device_lock, flags); |
dd00a99e N |
1496 | } else |
1497 | set_bit(Faulty, &rdev->flags); | |
2446dba0 N |
1498 | /* |
1499 | * if recovery is running, make sure it aborts. | |
1500 | */ | |
1501 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
850b2b42 | 1502 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
067032bc JP |
1503 | printk(KERN_ALERT |
1504 | "md/raid1:%s: Disk failure on %s, disabling device.\n" | |
1505 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
9dd1e2fa N |
1506 | mdname(mddev), bdevname(rdev->bdev, b), |
1507 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1508 | } |
1509 | ||
e8096360 | 1510 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1511 | { |
1512 | int i; | |
1da177e4 | 1513 | |
9dd1e2fa | 1514 | printk(KERN_DEBUG "RAID1 conf printout:\n"); |
1da177e4 | 1515 | if (!conf) { |
9dd1e2fa | 1516 | printk(KERN_DEBUG "(!conf)\n"); |
1da177e4 LT |
1517 | return; |
1518 | } | |
9dd1e2fa | 1519 | printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1da177e4 LT |
1520 | conf->raid_disks); |
1521 | ||
ddac7c7e | 1522 | rcu_read_lock(); |
1da177e4 LT |
1523 | for (i = 0; i < conf->raid_disks; i++) { |
1524 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1525 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1526 | if (rdev) |
9dd1e2fa | 1527 | printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", |
ddac7c7e N |
1528 | i, !test_bit(In_sync, &rdev->flags), |
1529 | !test_bit(Faulty, &rdev->flags), | |
1530 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1531 | } |
ddac7c7e | 1532 | rcu_read_unlock(); |
1da177e4 LT |
1533 | } |
1534 | ||
e8096360 | 1535 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1536 | { |
79ef3a8a | 1537 | wait_barrier(conf, NULL); |
1538 | allow_barrier(conf, 0, 0); | |
1da177e4 LT |
1539 | |
1540 | mempool_destroy(conf->r1buf_pool); | |
1541 | conf->r1buf_pool = NULL; | |
79ef3a8a | 1542 | |
669cc7ba | 1543 | spin_lock_irq(&conf->resync_lock); |
79ef3a8a | 1544 | conf->next_resync = 0; |
1545 | conf->start_next_window = MaxSector; | |
669cc7ba N |
1546 | conf->current_window_requests += |
1547 | conf->next_window_requests; | |
1548 | conf->next_window_requests = 0; | |
1549 | spin_unlock_irq(&conf->resync_lock); | |
1da177e4 LT |
1550 | } |
1551 | ||
fd01b88c | 1552 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1553 | { |
1554 | int i; | |
e8096360 | 1555 | struct r1conf *conf = mddev->private; |
6b965620 N |
1556 | int count = 0; |
1557 | unsigned long flags; | |
1da177e4 LT |
1558 | |
1559 | /* | |
f72ffdd6 | 1560 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1561 | * and mark them readable. |
1562 | * Called under mddev lock, so rcu protection not needed. | |
1da177e4 LT |
1563 | */ |
1564 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1565 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1566 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1567 | if (repl | |
1568 | && repl->recovery_offset == MaxSector | |
1569 | && !test_bit(Faulty, &repl->flags) | |
1570 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1571 | /* replacement has just become active */ | |
1572 | if (!rdev || | |
1573 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1574 | count++; | |
1575 | if (rdev) { | |
1576 | /* Replaced device not technically | |
1577 | * faulty, but we need to be sure | |
1578 | * it gets removed and never re-added | |
1579 | */ | |
1580 | set_bit(Faulty, &rdev->flags); | |
1581 | sysfs_notify_dirent_safe( | |
1582 | rdev->sysfs_state); | |
1583 | } | |
1584 | } | |
ddac7c7e | 1585 | if (rdev |
61e4947c | 1586 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1587 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1588 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1589 | count++; |
654e8b5a | 1590 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1591 | } |
1592 | } | |
6b965620 N |
1593 | spin_lock_irqsave(&conf->device_lock, flags); |
1594 | mddev->degraded -= count; | |
1595 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1596 | |
1597 | print_conf(conf); | |
6b965620 | 1598 | return count; |
1da177e4 LT |
1599 | } |
1600 | ||
fd01b88c | 1601 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1602 | { |
e8096360 | 1603 | struct r1conf *conf = mddev->private; |
199050ea | 1604 | int err = -EEXIST; |
41158c7e | 1605 | int mirror = 0; |
0eaf822c | 1606 | struct raid1_info *p; |
6c2fce2e | 1607 | int first = 0; |
30194636 | 1608 | int last = conf->raid_disks - 1; |
6b740b8d | 1609 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
1da177e4 | 1610 | |
5389042f N |
1611 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1612 | return -EBUSY; | |
1613 | ||
6c2fce2e NB |
1614 | if (rdev->raid_disk >= 0) |
1615 | first = last = rdev->raid_disk; | |
1616 | ||
6b740b8d N |
1617 | if (q->merge_bvec_fn) { |
1618 | set_bit(Unmerged, &rdev->flags); | |
1619 | mddev->merge_check_needed = 1; | |
1620 | } | |
1621 | ||
7ef449d1 N |
1622 | for (mirror = first; mirror <= last; mirror++) { |
1623 | p = conf->mirrors+mirror; | |
1624 | if (!p->rdev) { | |
1da177e4 | 1625 | |
9092c02d JB |
1626 | if (mddev->gendisk) |
1627 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1628 | rdev->data_offset << 9); | |
1da177e4 LT |
1629 | |
1630 | p->head_position = 0; | |
1631 | rdev->raid_disk = mirror; | |
199050ea | 1632 | err = 0; |
6aea114a N |
1633 | /* As all devices are equivalent, we don't need a full recovery |
1634 | * if this was recently any drive of the array | |
1635 | */ | |
1636 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1637 | conf->fullsync = 1; |
d6065f7b | 1638 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1639 | break; |
1640 | } | |
7ef449d1 N |
1641 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1642 | p[conf->raid_disks].rdev == NULL) { | |
1643 | /* Add this device as a replacement */ | |
1644 | clear_bit(In_sync, &rdev->flags); | |
1645 | set_bit(Replacement, &rdev->flags); | |
1646 | rdev->raid_disk = mirror; | |
1647 | err = 0; | |
1648 | conf->fullsync = 1; | |
1649 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1650 | break; | |
1651 | } | |
1652 | } | |
6b740b8d N |
1653 | if (err == 0 && test_bit(Unmerged, &rdev->flags)) { |
1654 | /* Some requests might not have seen this new | |
1655 | * merge_bvec_fn. We must wait for them to complete | |
1656 | * before merging the device fully. | |
1657 | * First we make sure any code which has tested | |
1658 | * our function has submitted the request, then | |
1659 | * we wait for all outstanding requests to complete. | |
1660 | */ | |
1661 | synchronize_sched(); | |
e2d59925 N |
1662 | freeze_array(conf, 0); |
1663 | unfreeze_array(conf); | |
6b740b8d N |
1664 | clear_bit(Unmerged, &rdev->flags); |
1665 | } | |
ac5e7113 | 1666 | md_integrity_add_rdev(rdev, mddev); |
9092c02d | 1667 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2ff8cc2c | 1668 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1669 | print_conf(conf); |
199050ea | 1670 | return err; |
1da177e4 LT |
1671 | } |
1672 | ||
b8321b68 | 1673 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1674 | { |
e8096360 | 1675 | struct r1conf *conf = mddev->private; |
1da177e4 | 1676 | int err = 0; |
b8321b68 | 1677 | int number = rdev->raid_disk; |
0eaf822c | 1678 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1679 | |
b014f14c N |
1680 | if (rdev != p->rdev) |
1681 | p = conf->mirrors + conf->raid_disks + number; | |
1682 | ||
1da177e4 | 1683 | print_conf(conf); |
b8321b68 | 1684 | if (rdev == p->rdev) { |
b2d444d7 | 1685 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1686 | atomic_read(&rdev->nr_pending)) { |
1687 | err = -EBUSY; | |
1688 | goto abort; | |
1689 | } | |
046abeed | 1690 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1691 | * is not possible. |
1692 | */ | |
1693 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1694 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1695 | mddev->degraded < conf->raid_disks) { |
1696 | err = -EBUSY; | |
1697 | goto abort; | |
1698 | } | |
1da177e4 | 1699 | p->rdev = NULL; |
fbd568a3 | 1700 | synchronize_rcu(); |
1da177e4 LT |
1701 | if (atomic_read(&rdev->nr_pending)) { |
1702 | /* lost the race, try later */ | |
1703 | err = -EBUSY; | |
1704 | p->rdev = rdev; | |
ac5e7113 | 1705 | goto abort; |
8c7a2c2b N |
1706 | } else if (conf->mirrors[conf->raid_disks + number].rdev) { |
1707 | /* We just removed a device that is being replaced. | |
1708 | * Move down the replacement. We drain all IO before | |
1709 | * doing this to avoid confusion. | |
1710 | */ | |
1711 | struct md_rdev *repl = | |
1712 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1713 | freeze_array(conf, 0); |
8c7a2c2b N |
1714 | clear_bit(Replacement, &repl->flags); |
1715 | p->rdev = repl; | |
1716 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1717 | unfreeze_array(conf); |
8c7a2c2b N |
1718 | clear_bit(WantReplacement, &rdev->flags); |
1719 | } else | |
b014f14c | 1720 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1721 | err = md_integrity_register(mddev); |
1da177e4 LT |
1722 | } |
1723 | abort: | |
1724 | ||
1725 | print_conf(conf); | |
1726 | return err; | |
1727 | } | |
1728 | ||
6712ecf8 | 1729 | static void end_sync_read(struct bio *bio, int error) |
1da177e4 | 1730 | { |
9f2c9d12 | 1731 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1732 | |
0fc280f6 | 1733 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1734 | |
1da177e4 LT |
1735 | /* |
1736 | * we have read a block, now it needs to be re-written, | |
1737 | * or re-read if the read failed. | |
1738 | * We don't do much here, just schedule handling by raid1d | |
1739 | */ | |
69382e85 | 1740 | if (test_bit(BIO_UPTODATE, &bio->bi_flags)) |
1da177e4 | 1741 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1742 | |
1743 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1744 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1745 | } |
1746 | ||
6712ecf8 | 1747 | static void end_sync_write(struct bio *bio, int error) |
1da177e4 LT |
1748 | { |
1749 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
9f2c9d12 | 1750 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1751 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1752 | struct r1conf *conf = mddev->private; |
1da177e4 | 1753 | int mirror=0; |
4367af55 N |
1754 | sector_t first_bad; |
1755 | int bad_sectors; | |
1da177e4 | 1756 | |
ba3ae3be NK |
1757 | mirror = find_bio_disk(r1_bio, bio); |
1758 | ||
6b1117d5 | 1759 | if (!uptodate) { |
57dab0bd | 1760 | sector_t sync_blocks = 0; |
6b1117d5 N |
1761 | sector_t s = r1_bio->sector; |
1762 | long sectors_to_go = r1_bio->sectors; | |
1763 | /* make sure these bits doesn't get cleared. */ | |
1764 | do { | |
5e3db645 | 1765 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1766 | &sync_blocks, 1); |
1767 | s += sync_blocks; | |
1768 | sectors_to_go -= sync_blocks; | |
1769 | } while (sectors_to_go > 0); | |
d8f05d29 N |
1770 | set_bit(WriteErrorSeen, |
1771 | &conf->mirrors[mirror].rdev->flags); | |
19d67169 N |
1772 | if (!test_and_set_bit(WantReplacement, |
1773 | &conf->mirrors[mirror].rdev->flags)) | |
1774 | set_bit(MD_RECOVERY_NEEDED, & | |
1775 | mddev->recovery); | |
d8f05d29 | 1776 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 N |
1777 | } else if (is_badblock(conf->mirrors[mirror].rdev, |
1778 | r1_bio->sector, | |
1779 | r1_bio->sectors, | |
3a9f28a5 N |
1780 | &first_bad, &bad_sectors) && |
1781 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1782 | r1_bio->sector, | |
1783 | r1_bio->sectors, | |
1784 | &first_bad, &bad_sectors) | |
1785 | ) | |
4367af55 | 1786 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1787 | |
1da177e4 | 1788 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1789 | int s = r1_bio->sectors; |
d8f05d29 N |
1790 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1791 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1792 | reschedule_retry(r1_bio); |
1793 | else { | |
1794 | put_buf(r1_bio); | |
1795 | md_done_sync(mddev, s, uptodate); | |
1796 | } | |
1da177e4 | 1797 | } |
1da177e4 LT |
1798 | } |
1799 | ||
3cb03002 | 1800 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1801 | int sectors, struct page *page, int rw) |
1802 | { | |
1803 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) | |
1804 | /* success */ | |
1805 | return 1; | |
19d67169 | 1806 | if (rw == WRITE) { |
d8f05d29 | 1807 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1808 | if (!test_and_set_bit(WantReplacement, |
1809 | &rdev->flags)) | |
1810 | set_bit(MD_RECOVERY_NEEDED, & | |
1811 | rdev->mddev->recovery); | |
1812 | } | |
d8f05d29 N |
1813 | /* need to record an error - either for the block or the device */ |
1814 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1815 | md_error(rdev->mddev, rdev); | |
1816 | return 0; | |
1817 | } | |
1818 | ||
9f2c9d12 | 1819 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1820 | { |
a68e5870 N |
1821 | /* Try some synchronous reads of other devices to get |
1822 | * good data, much like with normal read errors. Only | |
1823 | * read into the pages we already have so we don't | |
1824 | * need to re-issue the read request. | |
1825 | * We don't need to freeze the array, because being in an | |
1826 | * active sync request, there is no normal IO, and | |
1827 | * no overlapping syncs. | |
06f60385 N |
1828 | * We don't need to check is_badblock() again as we |
1829 | * made sure that anything with a bad block in range | |
1830 | * will have bi_end_io clear. | |
a68e5870 | 1831 | */ |
fd01b88c | 1832 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1833 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1834 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1835 | sector_t sect = r1_bio->sector; | |
1836 | int sectors = r1_bio->sectors; | |
1837 | int idx = 0; | |
1838 | ||
1839 | while(sectors) { | |
1840 | int s = sectors; | |
1841 | int d = r1_bio->read_disk; | |
1842 | int success = 0; | |
3cb03002 | 1843 | struct md_rdev *rdev; |
78d7f5f7 | 1844 | int start; |
a68e5870 N |
1845 | |
1846 | if (s > (PAGE_SIZE>>9)) | |
1847 | s = PAGE_SIZE >> 9; | |
1848 | do { | |
1849 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1850 | /* No rcu protection needed here devices | |
1851 | * can only be removed when no resync is | |
1852 | * active, and resync is currently active | |
1853 | */ | |
1854 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1855 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 N |
1856 | bio->bi_io_vec[idx].bv_page, |
1857 | READ, false)) { | |
1858 | success = 1; | |
1859 | break; | |
1860 | } | |
1861 | } | |
1862 | d++; | |
8f19ccb2 | 1863 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1864 | d = 0; |
1865 | } while (!success && d != r1_bio->read_disk); | |
1866 | ||
78d7f5f7 | 1867 | if (!success) { |
a68e5870 | 1868 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1869 | int abort = 0; |
1870 | /* Cannot read from anywhere, this block is lost. | |
1871 | * Record a bad block on each device. If that doesn't | |
1872 | * work just disable and interrupt the recovery. | |
1873 | * Don't fail devices as that won't really help. | |
1874 | */ | |
a68e5870 N |
1875 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" |
1876 | " for block %llu\n", | |
1877 | mdname(mddev), | |
1878 | bdevname(bio->bi_bdev, b), | |
1879 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 1880 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1881 | rdev = conf->mirrors[d].rdev; |
1882 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1883 | continue; | |
1884 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1885 | abort = 1; | |
1886 | } | |
1887 | if (abort) { | |
d890fa2b N |
1888 | conf->recovery_disabled = |
1889 | mddev->recovery_disabled; | |
3a9f28a5 N |
1890 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1891 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1892 | put_buf(r1_bio); | |
1893 | return 0; | |
1894 | } | |
1895 | /* Try next page */ | |
1896 | sectors -= s; | |
1897 | sect += s; | |
1898 | idx++; | |
1899 | continue; | |
d11c171e | 1900 | } |
78d7f5f7 N |
1901 | |
1902 | start = d; | |
1903 | /* write it back and re-read */ | |
1904 | while (d != r1_bio->read_disk) { | |
1905 | if (d == 0) | |
8f19ccb2 | 1906 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1907 | d--; |
1908 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1909 | continue; | |
1910 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1911 | if (r1_sync_page_io(rdev, sect, s, |
1912 | bio->bi_io_vec[idx].bv_page, | |
1913 | WRITE) == 0) { | |
78d7f5f7 N |
1914 | r1_bio->bios[d]->bi_end_io = NULL; |
1915 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1916 | } |
78d7f5f7 N |
1917 | } |
1918 | d = start; | |
1919 | while (d != r1_bio->read_disk) { | |
1920 | if (d == 0) | |
8f19ccb2 | 1921 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1922 | d--; |
1923 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1924 | continue; | |
1925 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1926 | if (r1_sync_page_io(rdev, sect, s, |
1927 | bio->bi_io_vec[idx].bv_page, | |
1928 | READ) != 0) | |
9d3d8011 | 1929 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1930 | } |
a68e5870 N |
1931 | sectors -= s; |
1932 | sect += s; | |
1933 | idx ++; | |
1934 | } | |
78d7f5f7 | 1935 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
7ca78d57 | 1936 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
a68e5870 N |
1937 | return 1; |
1938 | } | |
1939 | ||
c95e6385 | 1940 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1941 | { |
1942 | /* We have read all readable devices. If we haven't | |
1943 | * got the block, then there is no hope left. | |
1944 | * If we have, then we want to do a comparison | |
1945 | * and skip the write if everything is the same. | |
1946 | * If any blocks failed to read, then we need to | |
1947 | * attempt an over-write | |
1948 | */ | |
fd01b88c | 1949 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1950 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1951 | int primary; |
1952 | int i; | |
f4380a91 | 1953 | int vcnt; |
a68e5870 | 1954 | |
30bc9b53 N |
1955 | /* Fix variable parts of all bios */ |
1956 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
1957 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
1958 | int j; | |
1959 | int size; | |
1877db75 | 1960 | int uptodate; |
30bc9b53 N |
1961 | struct bio *b = r1_bio->bios[i]; |
1962 | if (b->bi_end_io != end_sync_read) | |
1963 | continue; | |
1877db75 N |
1964 | /* fixup the bio for reuse, but preserve BIO_UPTODATE */ |
1965 | uptodate = test_bit(BIO_UPTODATE, &b->bi_flags); | |
30bc9b53 | 1966 | bio_reset(b); |
1877db75 N |
1967 | if (!uptodate) |
1968 | clear_bit(BIO_UPTODATE, &b->bi_flags); | |
30bc9b53 | 1969 | b->bi_vcnt = vcnt; |
4f024f37 KO |
1970 | b->bi_iter.bi_size = r1_bio->sectors << 9; |
1971 | b->bi_iter.bi_sector = r1_bio->sector + | |
30bc9b53 N |
1972 | conf->mirrors[i].rdev->data_offset; |
1973 | b->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1974 | b->bi_end_io = end_sync_read; | |
1975 | b->bi_private = r1_bio; | |
1976 | ||
4f024f37 | 1977 | size = b->bi_iter.bi_size; |
30bc9b53 N |
1978 | for (j = 0; j < vcnt ; j++) { |
1979 | struct bio_vec *bi; | |
1980 | bi = &b->bi_io_vec[j]; | |
1981 | bi->bv_offset = 0; | |
1982 | if (size > PAGE_SIZE) | |
1983 | bi->bv_len = PAGE_SIZE; | |
1984 | else | |
1985 | bi->bv_len = size; | |
1986 | size -= PAGE_SIZE; | |
1987 | } | |
1988 | } | |
8f19ccb2 | 1989 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 N |
1990 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
1991 | test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { | |
1992 | r1_bio->bios[primary]->bi_end_io = NULL; | |
1993 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1994 | break; | |
1995 | } | |
1996 | r1_bio->read_disk = primary; | |
8f19ccb2 | 1997 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 1998 | int j; |
78d7f5f7 N |
1999 | struct bio *pbio = r1_bio->bios[primary]; |
2000 | struct bio *sbio = r1_bio->bios[i]; | |
1877db75 | 2001 | int uptodate = test_bit(BIO_UPTODATE, &sbio->bi_flags); |
a68e5870 | 2002 | |
2aabaa65 | 2003 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 2004 | continue; |
1877db75 N |
2005 | /* Now we can 'fixup' the BIO_UPTODATE flag */ |
2006 | set_bit(BIO_UPTODATE, &sbio->bi_flags); | |
78d7f5f7 | 2007 | |
1877db75 | 2008 | if (uptodate) { |
78d7f5f7 N |
2009 | for (j = vcnt; j-- ; ) { |
2010 | struct page *p, *s; | |
2011 | p = pbio->bi_io_vec[j].bv_page; | |
2012 | s = sbio->bi_io_vec[j].bv_page; | |
2013 | if (memcmp(page_address(p), | |
2014 | page_address(s), | |
5020ad7d | 2015 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 2016 | break; |
69382e85 | 2017 | } |
78d7f5f7 N |
2018 | } else |
2019 | j = 0; | |
2020 | if (j >= 0) | |
7f7583d4 | 2021 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 2022 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
1877db75 | 2023 | && uptodate)) { |
78d7f5f7 N |
2024 | /* No need to write to this device. */ |
2025 | sbio->bi_end_io = NULL; | |
2026 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
2027 | continue; | |
2028 | } | |
d3b45c2a KO |
2029 | |
2030 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 2031 | } |
a68e5870 N |
2032 | } |
2033 | ||
9f2c9d12 | 2034 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 2035 | { |
e8096360 | 2036 | struct r1conf *conf = mddev->private; |
a68e5870 | 2037 | int i; |
8f19ccb2 | 2038 | int disks = conf->raid_disks * 2; |
a68e5870 N |
2039 | struct bio *bio, *wbio; |
2040 | ||
2041 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2042 | ||
a68e5870 N |
2043 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
2044 | /* ouch - failed to read all of that. */ | |
2045 | if (!fix_sync_read_error(r1_bio)) | |
2046 | return; | |
7ca78d57 N |
2047 | |
2048 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
2049 | process_checks(r1_bio); |
2050 | ||
d11c171e N |
2051 | /* |
2052 | * schedule writes | |
2053 | */ | |
1da177e4 LT |
2054 | atomic_set(&r1_bio->remaining, 1); |
2055 | for (i = 0; i < disks ; i++) { | |
2056 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2057 | if (wbio->bi_end_io == NULL || |
2058 | (wbio->bi_end_io == end_sync_read && | |
2059 | (i == r1_bio->read_disk || | |
2060 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
2061 | continue; |
2062 | ||
3e198f78 N |
2063 | wbio->bi_rw = WRITE; |
2064 | wbio->bi_end_io = end_sync_write; | |
1da177e4 | 2065 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2066 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2067 | |
1da177e4 LT |
2068 | generic_make_request(wbio); |
2069 | } | |
2070 | ||
2071 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2072 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2073 | int s = r1_bio->sectors; |
2074 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2075 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2076 | reschedule_retry(r1_bio); | |
2077 | else { | |
2078 | put_buf(r1_bio); | |
2079 | md_done_sync(mddev, s, 1); | |
2080 | } | |
1da177e4 LT |
2081 | } |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * This is a kernel thread which: | |
2086 | * | |
2087 | * 1. Retries failed read operations on working mirrors. | |
2088 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2089 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2090 | */ |
2091 | ||
e8096360 | 2092 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2093 | sector_t sect, int sectors) |
2094 | { | |
fd01b88c | 2095 | struct mddev *mddev = conf->mddev; |
867868fb N |
2096 | while(sectors) { |
2097 | int s = sectors; | |
2098 | int d = read_disk; | |
2099 | int success = 0; | |
2100 | int start; | |
3cb03002 | 2101 | struct md_rdev *rdev; |
867868fb N |
2102 | |
2103 | if (s > (PAGE_SIZE>>9)) | |
2104 | s = PAGE_SIZE >> 9; | |
2105 | ||
2106 | do { | |
2107 | /* Note: no rcu protection needed here | |
2108 | * as this is synchronous in the raid1d thread | |
2109 | * which is the thread that might remove | |
2110 | * a device. If raid1d ever becomes multi-threaded.... | |
2111 | */ | |
d2eb35ac N |
2112 | sector_t first_bad; |
2113 | int bad_sectors; | |
2114 | ||
867868fb N |
2115 | rdev = conf->mirrors[d].rdev; |
2116 | if (rdev && | |
da8840a7 | 2117 | (test_bit(In_sync, &rdev->flags) || |
2118 | (!test_bit(Faulty, &rdev->flags) && | |
2119 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac N |
2120 | is_badblock(rdev, sect, s, |
2121 | &first_bad, &bad_sectors) == 0 && | |
ccebd4c4 JB |
2122 | sync_page_io(rdev, sect, s<<9, |
2123 | conf->tmppage, READ, false)) | |
867868fb N |
2124 | success = 1; |
2125 | else { | |
2126 | d++; | |
8f19ccb2 | 2127 | if (d == conf->raid_disks * 2) |
867868fb N |
2128 | d = 0; |
2129 | } | |
2130 | } while (!success && d != read_disk); | |
2131 | ||
2132 | if (!success) { | |
d8f05d29 | 2133 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2134 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2135 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2136 | md_error(mddev, rdev); | |
867868fb N |
2137 | break; |
2138 | } | |
2139 | /* write it back and re-read */ | |
2140 | start = d; | |
2141 | while (d != read_disk) { | |
2142 | if (d==0) | |
8f19ccb2 | 2143 | d = conf->raid_disks * 2; |
867868fb N |
2144 | d--; |
2145 | rdev = conf->mirrors[d].rdev; | |
2146 | if (rdev && | |
b8cb6b4c | 2147 | !test_bit(Faulty, &rdev->flags)) |
d8f05d29 N |
2148 | r1_sync_page_io(rdev, sect, s, |
2149 | conf->tmppage, WRITE); | |
867868fb N |
2150 | } |
2151 | d = start; | |
2152 | while (d != read_disk) { | |
2153 | char b[BDEVNAME_SIZE]; | |
2154 | if (d==0) | |
8f19ccb2 | 2155 | d = conf->raid_disks * 2; |
867868fb N |
2156 | d--; |
2157 | rdev = conf->mirrors[d].rdev; | |
2158 | if (rdev && | |
b8cb6b4c | 2159 | !test_bit(Faulty, &rdev->flags)) { |
d8f05d29 N |
2160 | if (r1_sync_page_io(rdev, sect, s, |
2161 | conf->tmppage, READ)) { | |
867868fb N |
2162 | atomic_add(s, &rdev->corrected_errors); |
2163 | printk(KERN_INFO | |
9dd1e2fa | 2164 | "md/raid1:%s: read error corrected " |
867868fb N |
2165 | "(%d sectors at %llu on %s)\n", |
2166 | mdname(mddev), s, | |
969b755a RD |
2167 | (unsigned long long)(sect + |
2168 | rdev->data_offset), | |
867868fb N |
2169 | bdevname(rdev->bdev, b)); |
2170 | } | |
2171 | } | |
2172 | } | |
2173 | sectors -= s; | |
2174 | sect += s; | |
2175 | } | |
2176 | } | |
2177 | ||
9f2c9d12 | 2178 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2179 | { |
fd01b88c | 2180 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2181 | struct r1conf *conf = mddev->private; |
3cb03002 | 2182 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2183 | |
2184 | /* bio has the data to be written to device 'i' where | |
2185 | * we just recently had a write error. | |
2186 | * We repeatedly clone the bio and trim down to one block, | |
2187 | * then try the write. Where the write fails we record | |
2188 | * a bad block. | |
2189 | * It is conceivable that the bio doesn't exactly align with | |
2190 | * blocks. We must handle this somehow. | |
2191 | * | |
2192 | * We currently own a reference on the rdev. | |
2193 | */ | |
2194 | ||
2195 | int block_sectors; | |
2196 | sector_t sector; | |
2197 | int sectors; | |
2198 | int sect_to_write = r1_bio->sectors; | |
2199 | int ok = 1; | |
2200 | ||
2201 | if (rdev->badblocks.shift < 0) | |
2202 | return 0; | |
2203 | ||
ab713cdc ND |
2204 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2205 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2206 | sector = r1_bio->sector; |
2207 | sectors = ((sector + block_sectors) | |
2208 | & ~(sector_t)(block_sectors - 1)) | |
2209 | - sector; | |
2210 | ||
cd5ff9a1 N |
2211 | while (sect_to_write) { |
2212 | struct bio *wbio; | |
2213 | if (sectors > sect_to_write) | |
2214 | sectors = sect_to_write; | |
2215 | /* Write at 'sector' for 'sectors'*/ | |
2216 | ||
b783863f KO |
2217 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
2218 | unsigned vcnt = r1_bio->behind_page_count; | |
2219 | struct bio_vec *vec = r1_bio->behind_bvecs; | |
2220 | ||
2221 | while (!vec->bv_page) { | |
2222 | vec++; | |
2223 | vcnt--; | |
2224 | } | |
2225 | ||
2226 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2227 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2228 | ||
2229 | wbio->bi_vcnt = vcnt; | |
2230 | } else { | |
2231 | wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2232 | } | |
2233 | ||
cd5ff9a1 | 2234 | wbio->bi_rw = WRITE; |
4f024f37 KO |
2235 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2236 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2237 | |
6678d83f | 2238 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2239 | wbio->bi_iter.bi_sector += rdev->data_offset; |
cd5ff9a1 N |
2240 | wbio->bi_bdev = rdev->bdev; |
2241 | if (submit_bio_wait(WRITE, wbio) == 0) | |
2242 | /* failure! */ | |
2243 | ok = rdev_set_badblocks(rdev, sector, | |
2244 | sectors, 0) | |
2245 | && ok; | |
2246 | ||
2247 | bio_put(wbio); | |
2248 | sect_to_write -= sectors; | |
2249 | sector += sectors; | |
2250 | sectors = block_sectors; | |
2251 | } | |
2252 | return ok; | |
2253 | } | |
2254 | ||
e8096360 | 2255 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2256 | { |
2257 | int m; | |
2258 | int s = r1_bio->sectors; | |
8f19ccb2 | 2259 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2260 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2261 | struct bio *bio = r1_bio->bios[m]; |
2262 | if (bio->bi_end_io == NULL) | |
2263 | continue; | |
2264 | if (test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2265 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { | |
c6563a8c | 2266 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce N |
2267 | } |
2268 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
2269 | test_bit(R1BIO_WriteError, &r1_bio->state)) { | |
2270 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2271 | md_error(conf->mddev, rdev); | |
2272 | } | |
2273 | } | |
2274 | put_buf(r1_bio); | |
2275 | md_done_sync(conf->mddev, s, 1); | |
2276 | } | |
2277 | ||
e8096360 | 2278 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2279 | { |
2280 | int m; | |
8f19ccb2 | 2281 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2282 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2283 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2284 | rdev_clear_badblocks(rdev, |
2285 | r1_bio->sector, | |
c6563a8c | 2286 | r1_bio->sectors, 0); |
62096bce N |
2287 | rdev_dec_pending(rdev, conf->mddev); |
2288 | } else if (r1_bio->bios[m] != NULL) { | |
2289 | /* This drive got a write error. We need to | |
2290 | * narrow down and record precise write | |
2291 | * errors. | |
2292 | */ | |
2293 | if (!narrow_write_error(r1_bio, m)) { | |
2294 | md_error(conf->mddev, | |
2295 | conf->mirrors[m].rdev); | |
2296 | /* an I/O failed, we can't clear the bitmap */ | |
2297 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2298 | } | |
2299 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2300 | conf->mddev); | |
2301 | } | |
2302 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2303 | close_write(r1_bio); | |
2304 | raid_end_bio_io(r1_bio); | |
2305 | } | |
2306 | ||
e8096360 | 2307 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2308 | { |
2309 | int disk; | |
2310 | int max_sectors; | |
fd01b88c | 2311 | struct mddev *mddev = conf->mddev; |
62096bce N |
2312 | struct bio *bio; |
2313 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2314 | struct md_rdev *rdev; |
62096bce N |
2315 | |
2316 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2317 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2318 | * the block and we can fix it. | |
2319 | * We freeze all other IO, and try reading the block from | |
2320 | * other devices. When we find one, we re-write | |
2321 | * and check it that fixes the read error. | |
2322 | * This is all done synchronously while the array is | |
2323 | * frozen | |
2324 | */ | |
2325 | if (mddev->ro == 0) { | |
e2d59925 | 2326 | freeze_array(conf, 1); |
62096bce N |
2327 | fix_read_error(conf, r1_bio->read_disk, |
2328 | r1_bio->sector, r1_bio->sectors); | |
2329 | unfreeze_array(conf); | |
2330 | } else | |
2331 | md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); | |
7ad4d4a6 | 2332 | rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); |
62096bce N |
2333 | |
2334 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2335 | bdevname(bio->bi_bdev, b); | |
2336 | read_more: | |
2337 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2338 | if (disk == -1) { | |
2339 | printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" | |
2340 | " read error for block %llu\n", | |
2341 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
2342 | raid_end_bio_io(r1_bio); | |
2343 | } else { | |
2344 | const unsigned long do_sync | |
2345 | = r1_bio->master_bio->bi_rw & REQ_SYNC; | |
2346 | if (bio) { | |
2347 | r1_bio->bios[r1_bio->read_disk] = | |
2348 | mddev->ro ? IO_BLOCKED : NULL; | |
2349 | bio_put(bio); | |
2350 | } | |
2351 | r1_bio->read_disk = disk; | |
2352 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
4f024f37 KO |
2353 | bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, |
2354 | max_sectors); | |
62096bce N |
2355 | r1_bio->bios[r1_bio->read_disk] = bio; |
2356 | rdev = conf->mirrors[disk].rdev; | |
2357 | printk_ratelimited(KERN_ERR | |
2358 | "md/raid1:%s: redirecting sector %llu" | |
2359 | " to other mirror: %s\n", | |
2360 | mdname(mddev), | |
2361 | (unsigned long long)r1_bio->sector, | |
2362 | bdevname(rdev->bdev, b)); | |
4f024f37 | 2363 | bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; |
62096bce N |
2364 | bio->bi_bdev = rdev->bdev; |
2365 | bio->bi_end_io = raid1_end_read_request; | |
2366 | bio->bi_rw = READ | do_sync; | |
2367 | bio->bi_private = r1_bio; | |
2368 | if (max_sectors < r1_bio->sectors) { | |
2369 | /* Drat - have to split this up more */ | |
2370 | struct bio *mbio = r1_bio->master_bio; | |
2371 | int sectors_handled = (r1_bio->sector + max_sectors | |
4f024f37 | 2372 | - mbio->bi_iter.bi_sector); |
62096bce N |
2373 | r1_bio->sectors = max_sectors; |
2374 | spin_lock_irq(&conf->device_lock); | |
2375 | if (mbio->bi_phys_segments == 0) | |
2376 | mbio->bi_phys_segments = 2; | |
2377 | else | |
2378 | mbio->bi_phys_segments++; | |
2379 | spin_unlock_irq(&conf->device_lock); | |
2380 | generic_make_request(bio); | |
2381 | bio = NULL; | |
2382 | ||
2383 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2384 | ||
2385 | r1_bio->master_bio = mbio; | |
aa8b57aa | 2386 | r1_bio->sectors = bio_sectors(mbio) - sectors_handled; |
62096bce N |
2387 | r1_bio->state = 0; |
2388 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2389 | r1_bio->mddev = mddev; | |
4f024f37 KO |
2390 | r1_bio->sector = mbio->bi_iter.bi_sector + |
2391 | sectors_handled; | |
62096bce N |
2392 | |
2393 | goto read_more; | |
2394 | } else | |
2395 | generic_make_request(bio); | |
2396 | } | |
2397 | } | |
2398 | ||
4ed8731d | 2399 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2400 | { |
4ed8731d | 2401 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2402 | struct r1bio *r1_bio; |
1da177e4 | 2403 | unsigned long flags; |
e8096360 | 2404 | struct r1conf *conf = mddev->private; |
1da177e4 | 2405 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2406 | struct blk_plug plug; |
1da177e4 LT |
2407 | |
2408 | md_check_recovery(mddev); | |
e1dfa0a2 N |
2409 | |
2410 | blk_start_plug(&plug); | |
1da177e4 | 2411 | for (;;) { |
191ea9b2 | 2412 | |
0021b7bc | 2413 | flush_pending_writes(conf); |
191ea9b2 | 2414 | |
a35e63ef N |
2415 | spin_lock_irqsave(&conf->device_lock, flags); |
2416 | if (list_empty(head)) { | |
2417 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2418 | break; |
a35e63ef | 2419 | } |
9f2c9d12 | 2420 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2421 | list_del(head->prev); |
ddaf22ab | 2422 | conf->nr_queued--; |
1da177e4 LT |
2423 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2424 | ||
2425 | mddev = r1_bio->mddev; | |
070ec55d | 2426 | conf = mddev->private; |
4367af55 | 2427 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2428 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2429 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2430 | handle_sync_write_finished(conf, r1_bio); | |
2431 | else | |
4367af55 | 2432 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2433 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2434 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2435 | handle_write_finished(conf, r1_bio); | |
2436 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2437 | handle_read_error(conf, r1_bio); | |
2438 | else | |
d2eb35ac N |
2439 | /* just a partial read to be scheduled from separate |
2440 | * context | |
2441 | */ | |
2442 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2443 | |
1d9d5241 | 2444 | cond_resched(); |
de393cde N |
2445 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2446 | md_check_recovery(mddev); | |
1da177e4 | 2447 | } |
e1dfa0a2 | 2448 | blk_finish_plug(&plug); |
1da177e4 LT |
2449 | } |
2450 | ||
e8096360 | 2451 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2452 | { |
2453 | int buffs; | |
2454 | ||
2455 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2456 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2457 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2458 | conf->poolinfo); | |
2459 | if (!conf->r1buf_pool) | |
2460 | return -ENOMEM; | |
2461 | conf->next_resync = 0; | |
2462 | return 0; | |
2463 | } | |
2464 | ||
2465 | /* | |
2466 | * perform a "sync" on one "block" | |
2467 | * | |
2468 | * We need to make sure that no normal I/O request - particularly write | |
2469 | * requests - conflict with active sync requests. | |
2470 | * | |
2471 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2472 | * that can be installed to exclude normal IO requests. | |
2473 | */ | |
2474 | ||
fd01b88c | 2475 | static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) |
1da177e4 | 2476 | { |
e8096360 | 2477 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2478 | struct r1bio *r1_bio; |
1da177e4 LT |
2479 | struct bio *bio; |
2480 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2481 | int disk = -1; |
1da177e4 | 2482 | int i; |
3e198f78 N |
2483 | int wonly = -1; |
2484 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2485 | sector_t sync_blocks; |
e3b9703e | 2486 | int still_degraded = 0; |
06f60385 N |
2487 | int good_sectors = RESYNC_SECTORS; |
2488 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2489 | |
2490 | if (!conf->r1buf_pool) | |
2491 | if (init_resync(conf)) | |
57afd89f | 2492 | return 0; |
1da177e4 | 2493 | |
58c0fed4 | 2494 | max_sector = mddev->dev_sectors; |
1da177e4 | 2495 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2496 | /* If we aborted, we need to abort the |
2497 | * sync on the 'current' bitmap chunk (there will | |
2498 | * only be one in raid1 resync. | |
2499 | * We can find the current addess in mddev->curr_resync | |
2500 | */ | |
6a806c51 N |
2501 | if (mddev->curr_resync < max_sector) /* aborted */ |
2502 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2503 | &sync_blocks, 1); |
6a806c51 | 2504 | else /* completed sync */ |
191ea9b2 | 2505 | conf->fullsync = 0; |
6a806c51 N |
2506 | |
2507 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 LT |
2508 | close_sync(conf); |
2509 | return 0; | |
2510 | } | |
2511 | ||
07d84d10 N |
2512 | if (mddev->bitmap == NULL && |
2513 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2514 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2515 | conf->fullsync == 0) { |
2516 | *skipped = 1; | |
2517 | return max_sector - sector_nr; | |
2518 | } | |
6394cca5 N |
2519 | /* before building a request, check if we can skip these blocks.. |
2520 | * This call the bitmap_start_sync doesn't actually record anything | |
2521 | */ | |
e3b9703e | 2522 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2523 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2524 | /* We can skip this block, and probably several more */ |
2525 | *skipped = 1; | |
2526 | return sync_blocks; | |
2527 | } | |
1da177e4 | 2528 | /* |
17999be4 N |
2529 | * If there is non-resync activity waiting for a turn, |
2530 | * and resync is going fast enough, | |
2531 | * then let it though before starting on this new sync request. | |
1da177e4 | 2532 | */ |
17999be4 | 2533 | if (!go_faster && conf->nr_waiting) |
1da177e4 | 2534 | msleep_interruptible(1000); |
17999be4 | 2535 | |
b47490c9 | 2536 | bitmap_cond_end_sync(mddev->bitmap, sector_nr); |
1c4588e9 | 2537 | r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); |
17999be4 | 2538 | |
c2fd4c94 | 2539 | raise_barrier(conf, sector_nr); |
1da177e4 | 2540 | |
3e198f78 | 2541 | rcu_read_lock(); |
1da177e4 | 2542 | /* |
3e198f78 N |
2543 | * If we get a correctably read error during resync or recovery, |
2544 | * we might want to read from a different device. So we | |
2545 | * flag all drives that could conceivably be read from for READ, | |
2546 | * and any others (which will be non-In_sync devices) for WRITE. | |
2547 | * If a read fails, we try reading from something else for which READ | |
2548 | * is OK. | |
1da177e4 | 2549 | */ |
1da177e4 | 2550 | |
1da177e4 LT |
2551 | r1_bio->mddev = mddev; |
2552 | r1_bio->sector = sector_nr; | |
191ea9b2 | 2553 | r1_bio->state = 0; |
1da177e4 | 2554 | set_bit(R1BIO_IsSync, &r1_bio->state); |
1da177e4 | 2555 | |
8f19ccb2 | 2556 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 2557 | struct md_rdev *rdev; |
1da177e4 | 2558 | bio = r1_bio->bios[i]; |
2aabaa65 | 2559 | bio_reset(bio); |
1da177e4 | 2560 | |
3e198f78 N |
2561 | rdev = rcu_dereference(conf->mirrors[i].rdev); |
2562 | if (rdev == NULL || | |
06f60385 | 2563 | test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
2564 | if (i < conf->raid_disks) |
2565 | still_degraded = 1; | |
3e198f78 | 2566 | } else if (!test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2567 | bio->bi_rw = WRITE; |
2568 | bio->bi_end_io = end_sync_write; | |
2569 | write_targets ++; | |
3e198f78 N |
2570 | } else { |
2571 | /* may need to read from here */ | |
06f60385 N |
2572 | sector_t first_bad = MaxSector; |
2573 | int bad_sectors; | |
2574 | ||
2575 | if (is_badblock(rdev, sector_nr, good_sectors, | |
2576 | &first_bad, &bad_sectors)) { | |
2577 | if (first_bad > sector_nr) | |
2578 | good_sectors = first_bad - sector_nr; | |
2579 | else { | |
2580 | bad_sectors -= (sector_nr - first_bad); | |
2581 | if (min_bad == 0 || | |
2582 | min_bad > bad_sectors) | |
2583 | min_bad = bad_sectors; | |
2584 | } | |
2585 | } | |
2586 | if (sector_nr < first_bad) { | |
2587 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2588 | if (wonly < 0) | |
2589 | wonly = i; | |
2590 | } else { | |
2591 | if (disk < 0) | |
2592 | disk = i; | |
2593 | } | |
2594 | bio->bi_rw = READ; | |
2595 | bio->bi_end_io = end_sync_read; | |
2596 | read_targets++; | |
d57368af AL |
2597 | } else if (!test_bit(WriteErrorSeen, &rdev->flags) && |
2598 | test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
2599 | !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { | |
2600 | /* | |
2601 | * The device is suitable for reading (InSync), | |
2602 | * but has bad block(s) here. Let's try to correct them, | |
2603 | * if we are doing resync or repair. Otherwise, leave | |
2604 | * this device alone for this sync request. | |
2605 | */ | |
2606 | bio->bi_rw = WRITE; | |
2607 | bio->bi_end_io = end_sync_write; | |
2608 | write_targets++; | |
3e198f78 | 2609 | } |
3e198f78 | 2610 | } |
06f60385 N |
2611 | if (bio->bi_end_io) { |
2612 | atomic_inc(&rdev->nr_pending); | |
4f024f37 | 2613 | bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; |
06f60385 N |
2614 | bio->bi_bdev = rdev->bdev; |
2615 | bio->bi_private = r1_bio; | |
2616 | } | |
1da177e4 | 2617 | } |
3e198f78 N |
2618 | rcu_read_unlock(); |
2619 | if (disk < 0) | |
2620 | disk = wonly; | |
2621 | r1_bio->read_disk = disk; | |
191ea9b2 | 2622 | |
06f60385 N |
2623 | if (read_targets == 0 && min_bad > 0) { |
2624 | /* These sectors are bad on all InSync devices, so we | |
2625 | * need to mark them bad on all write targets | |
2626 | */ | |
2627 | int ok = 1; | |
8f19ccb2 | 2628 | for (i = 0 ; i < conf->raid_disks * 2 ; i++) |
06f60385 | 2629 | if (r1_bio->bios[i]->bi_end_io == end_sync_write) { |
a42f9d83 | 2630 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
06f60385 N |
2631 | ok = rdev_set_badblocks(rdev, sector_nr, |
2632 | min_bad, 0 | |
2633 | ) && ok; | |
2634 | } | |
2635 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2636 | *skipped = 1; | |
2637 | put_buf(r1_bio); | |
2638 | ||
2639 | if (!ok) { | |
2640 | /* Cannot record the badblocks, so need to | |
2641 | * abort the resync. | |
2642 | * If there are multiple read targets, could just | |
2643 | * fail the really bad ones ??? | |
2644 | */ | |
2645 | conf->recovery_disabled = mddev->recovery_disabled; | |
2646 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2647 | return 0; | |
2648 | } else | |
2649 | return min_bad; | |
2650 | ||
2651 | } | |
2652 | if (min_bad > 0 && min_bad < good_sectors) { | |
2653 | /* only resync enough to reach the next bad->good | |
2654 | * transition */ | |
2655 | good_sectors = min_bad; | |
2656 | } | |
2657 | ||
3e198f78 N |
2658 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) |
2659 | /* extra read targets are also write targets */ | |
2660 | write_targets += read_targets-1; | |
2661 | ||
2662 | if (write_targets == 0 || read_targets == 0) { | |
1da177e4 LT |
2663 | /* There is nowhere to write, so all non-sync |
2664 | * drives must be failed - so we are finished | |
2665 | */ | |
b7219ccb N |
2666 | sector_t rv; |
2667 | if (min_bad > 0) | |
2668 | max_sector = sector_nr + min_bad; | |
2669 | rv = max_sector - sector_nr; | |
57afd89f | 2670 | *skipped = 1; |
1da177e4 | 2671 | put_buf(r1_bio); |
1da177e4 LT |
2672 | return rv; |
2673 | } | |
2674 | ||
c6207277 N |
2675 | if (max_sector > mddev->resync_max) |
2676 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
06f60385 N |
2677 | if (max_sector > sector_nr + good_sectors) |
2678 | max_sector = sector_nr + good_sectors; | |
1da177e4 | 2679 | nr_sectors = 0; |
289e99e8 | 2680 | sync_blocks = 0; |
1da177e4 LT |
2681 | do { |
2682 | struct page *page; | |
2683 | int len = PAGE_SIZE; | |
2684 | if (sector_nr + (len>>9) > max_sector) | |
2685 | len = (max_sector - sector_nr) << 9; | |
2686 | if (len == 0) | |
2687 | break; | |
6a806c51 N |
2688 | if (sync_blocks == 0) { |
2689 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, | |
e5de485f N |
2690 | &sync_blocks, still_degraded) && |
2691 | !conf->fullsync && | |
2692 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6a806c51 | 2693 | break; |
9e77c485 | 2694 | BUG_ON(sync_blocks < (PAGE_SIZE>>9)); |
7571ae88 | 2695 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2696 | len = sync_blocks<<9; |
ab7a30c7 | 2697 | } |
191ea9b2 | 2698 | |
8f19ccb2 | 2699 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2700 | bio = r1_bio->bios[i]; |
2701 | if (bio->bi_end_io) { | |
d11c171e | 2702 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2703 | if (bio_add_page(bio, page, len, 0) == 0) { |
2704 | /* stop here */ | |
d11c171e | 2705 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2706 | while (i > 0) { |
2707 | i--; | |
2708 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2709 | if (bio->bi_end_io==NULL) |
2710 | continue; | |
1da177e4 LT |
2711 | /* remove last page from this bio */ |
2712 | bio->bi_vcnt--; | |
4f024f37 | 2713 | bio->bi_iter.bi_size -= len; |
3fd83717 | 2714 | __clear_bit(BIO_SEG_VALID, &bio->bi_flags); |
1da177e4 LT |
2715 | } |
2716 | goto bio_full; | |
2717 | } | |
2718 | } | |
2719 | } | |
2720 | nr_sectors += len>>9; | |
2721 | sector_nr += len>>9; | |
191ea9b2 | 2722 | sync_blocks -= (len>>9); |
1da177e4 LT |
2723 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2724 | bio_full: | |
1da177e4 LT |
2725 | r1_bio->sectors = nr_sectors; |
2726 | ||
d11c171e N |
2727 | /* For a user-requested sync, we read all readable devices and do a |
2728 | * compare | |
2729 | */ | |
2730 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2731 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2732 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2733 | bio = r1_bio->bios[i]; |
2734 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2735 | read_targets--; |
ddac7c7e | 2736 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2737 | generic_make_request(bio); |
2738 | } | |
2739 | } | |
2740 | } else { | |
2741 | atomic_set(&r1_bio->remaining, 1); | |
2742 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2743 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2744 | generic_make_request(bio); |
1da177e4 | 2745 | |
d11c171e | 2746 | } |
1da177e4 LT |
2747 | return nr_sectors; |
2748 | } | |
2749 | ||
fd01b88c | 2750 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2751 | { |
2752 | if (sectors) | |
2753 | return sectors; | |
2754 | ||
2755 | return mddev->dev_sectors; | |
2756 | } | |
2757 | ||
e8096360 | 2758 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2759 | { |
e8096360 | 2760 | struct r1conf *conf; |
709ae487 | 2761 | int i; |
0eaf822c | 2762 | struct raid1_info *disk; |
3cb03002 | 2763 | struct md_rdev *rdev; |
709ae487 | 2764 | int err = -ENOMEM; |
1da177e4 | 2765 | |
e8096360 | 2766 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2767 | if (!conf) |
709ae487 | 2768 | goto abort; |
1da177e4 | 2769 | |
0eaf822c | 2770 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2771 | * mddev->raid_disks * 2, |
1da177e4 LT |
2772 | GFP_KERNEL); |
2773 | if (!conf->mirrors) | |
709ae487 | 2774 | goto abort; |
1da177e4 | 2775 | |
ddaf22ab N |
2776 | conf->tmppage = alloc_page(GFP_KERNEL); |
2777 | if (!conf->tmppage) | |
709ae487 | 2778 | goto abort; |
ddaf22ab | 2779 | |
709ae487 | 2780 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2781 | if (!conf->poolinfo) |
709ae487 | 2782 | goto abort; |
8f19ccb2 | 2783 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2784 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2785 | r1bio_pool_free, | |
2786 | conf->poolinfo); | |
2787 | if (!conf->r1bio_pool) | |
709ae487 N |
2788 | goto abort; |
2789 | ||
ed9bfdf1 | 2790 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2791 | |
c19d5798 | 2792 | err = -EINVAL; |
e7e72bf6 | 2793 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2794 | rdev_for_each(rdev, mddev) { |
aba336bd | 2795 | struct request_queue *q; |
709ae487 | 2796 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2797 | if (disk_idx >= mddev->raid_disks |
2798 | || disk_idx < 0) | |
2799 | continue; | |
c19d5798 | 2800 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2801 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2802 | else |
2803 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2804 | |
c19d5798 N |
2805 | if (disk->rdev) |
2806 | goto abort; | |
1da177e4 | 2807 | disk->rdev = rdev; |
aba336bd N |
2808 | q = bdev_get_queue(rdev->bdev); |
2809 | if (q->merge_bvec_fn) | |
2810 | mddev->merge_check_needed = 1; | |
1da177e4 LT |
2811 | |
2812 | disk->head_position = 0; | |
12cee5a8 | 2813 | disk->seq_start = MaxSector; |
1da177e4 LT |
2814 | } |
2815 | conf->raid_disks = mddev->raid_disks; | |
2816 | conf->mddev = mddev; | |
1da177e4 | 2817 | INIT_LIST_HEAD(&conf->retry_list); |
1da177e4 LT |
2818 | |
2819 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2820 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2821 | |
191ea9b2 | 2822 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2823 | conf->pending_count = 0; |
d890fa2b | 2824 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2825 | |
79ef3a8a | 2826 | conf->start_next_window = MaxSector; |
2827 | conf->current_window_requests = conf->next_window_requests = 0; | |
2828 | ||
c19d5798 | 2829 | err = -EIO; |
8f19ccb2 | 2830 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2831 | |
2832 | disk = conf->mirrors + i; | |
2833 | ||
c19d5798 N |
2834 | if (i < conf->raid_disks && |
2835 | disk[conf->raid_disks].rdev) { | |
2836 | /* This slot has a replacement. */ | |
2837 | if (!disk->rdev) { | |
2838 | /* No original, just make the replacement | |
2839 | * a recovering spare | |
2840 | */ | |
2841 | disk->rdev = | |
2842 | disk[conf->raid_disks].rdev; | |
2843 | disk[conf->raid_disks].rdev = NULL; | |
2844 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2845 | /* Original is not in_sync - bad */ | |
2846 | goto abort; | |
2847 | } | |
2848 | ||
5fd6c1dc N |
2849 | if (!disk->rdev || |
2850 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2851 | disk->head_position = 0; |
4f0a5e01 JB |
2852 | if (disk->rdev && |
2853 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2854 | conf->fullsync = 1; |
be4d3280 | 2855 | } |
1da177e4 | 2856 | } |
709ae487 | 2857 | |
709ae487 | 2858 | err = -ENOMEM; |
0232605d | 2859 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
709ae487 N |
2860 | if (!conf->thread) { |
2861 | printk(KERN_ERR | |
9dd1e2fa | 2862 | "md/raid1:%s: couldn't allocate thread\n", |
709ae487 N |
2863 | mdname(mddev)); |
2864 | goto abort; | |
11ce99e6 | 2865 | } |
1da177e4 | 2866 | |
709ae487 N |
2867 | return conf; |
2868 | ||
2869 | abort: | |
2870 | if (conf) { | |
2871 | if (conf->r1bio_pool) | |
2872 | mempool_destroy(conf->r1bio_pool); | |
2873 | kfree(conf->mirrors); | |
2874 | safe_put_page(conf->tmppage); | |
2875 | kfree(conf->poolinfo); | |
2876 | kfree(conf); | |
2877 | } | |
2878 | return ERR_PTR(err); | |
2879 | } | |
2880 | ||
afa0f557 | 2881 | static void raid1_free(struct mddev *mddev, void *priv); |
fd01b88c | 2882 | static int run(struct mddev *mddev) |
709ae487 | 2883 | { |
e8096360 | 2884 | struct r1conf *conf; |
709ae487 | 2885 | int i; |
3cb03002 | 2886 | struct md_rdev *rdev; |
5220ea1e | 2887 | int ret; |
2ff8cc2c | 2888 | bool discard_supported = false; |
709ae487 N |
2889 | |
2890 | if (mddev->level != 1) { | |
9dd1e2fa | 2891 | printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", |
709ae487 N |
2892 | mdname(mddev), mddev->level); |
2893 | return -EIO; | |
2894 | } | |
2895 | if (mddev->reshape_position != MaxSector) { | |
9dd1e2fa | 2896 | printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", |
709ae487 N |
2897 | mdname(mddev)); |
2898 | return -EIO; | |
2899 | } | |
1da177e4 | 2900 | /* |
709ae487 N |
2901 | * copy the already verified devices into our private RAID1 |
2902 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 2903 | * should be freed in raid1_free()] |
1da177e4 | 2904 | */ |
709ae487 N |
2905 | if (mddev->private == NULL) |
2906 | conf = setup_conf(mddev); | |
2907 | else | |
2908 | conf = mddev->private; | |
1da177e4 | 2909 | |
709ae487 N |
2910 | if (IS_ERR(conf)) |
2911 | return PTR_ERR(conf); | |
1da177e4 | 2912 | |
c8dc9c65 | 2913 | if (mddev->queue) |
5026d7a9 PA |
2914 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
2915 | ||
dafb20fa | 2916 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
2917 | if (!mddev->gendisk) |
2918 | continue; | |
709ae487 N |
2919 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2920 | rdev->data_offset << 9); | |
2ff8cc2c SL |
2921 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2922 | discard_supported = true; | |
1da177e4 | 2923 | } |
191ea9b2 | 2924 | |
709ae487 N |
2925 | mddev->degraded = 0; |
2926 | for (i=0; i < conf->raid_disks; i++) | |
2927 | if (conf->mirrors[i].rdev == NULL || | |
2928 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2929 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2930 | mddev->degraded++; | |
2931 | ||
2932 | if (conf->raid_disks - mddev->degraded == 1) | |
2933 | mddev->recovery_cp = MaxSector; | |
2934 | ||
8c6ac868 | 2935 | if (mddev->recovery_cp != MaxSector) |
9dd1e2fa | 2936 | printk(KERN_NOTICE "md/raid1:%s: not clean" |
8c6ac868 AN |
2937 | " -- starting background reconstruction\n", |
2938 | mdname(mddev)); | |
f72ffdd6 | 2939 | printk(KERN_INFO |
9dd1e2fa | 2940 | "md/raid1:%s: active with %d out of %d mirrors\n", |
f72ffdd6 | 2941 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 2942 | mddev->raid_disks); |
709ae487 | 2943 | |
1da177e4 LT |
2944 | /* |
2945 | * Ok, everything is just fine now | |
2946 | */ | |
709ae487 N |
2947 | mddev->thread = conf->thread; |
2948 | conf->thread = NULL; | |
2949 | mddev->private = conf; | |
2950 | ||
1f403624 | 2951 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2952 | |
1ed7242e | 2953 | if (mddev->queue) { |
2ff8cc2c SL |
2954 | if (discard_supported) |
2955 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
2956 | mddev->queue); | |
2957 | else | |
2958 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
2959 | mddev->queue); | |
1ed7242e | 2960 | } |
5220ea1e | 2961 | |
2962 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
2963 | if (ret) { |
2964 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 2965 | raid1_free(mddev, conf); |
5aa61f42 | 2966 | } |
5220ea1e | 2967 | return ret; |
1da177e4 LT |
2968 | } |
2969 | ||
afa0f557 | 2970 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 2971 | { |
afa0f557 | 2972 | struct r1conf *conf = priv; |
409c57f3 | 2973 | |
1da177e4 LT |
2974 | if (conf->r1bio_pool) |
2975 | mempool_destroy(conf->r1bio_pool); | |
990a8baf | 2976 | kfree(conf->mirrors); |
0fea7ed8 | 2977 | safe_put_page(conf->tmppage); |
990a8baf | 2978 | kfree(conf->poolinfo); |
1da177e4 | 2979 | kfree(conf); |
1da177e4 LT |
2980 | } |
2981 | ||
fd01b88c | 2982 | static int raid1_resize(struct mddev *mddev, sector_t sectors) |
1da177e4 LT |
2983 | { |
2984 | /* no resync is happening, and there is enough space | |
2985 | * on all devices, so we can resize. | |
2986 | * We need to make sure resync covers any new space. | |
2987 | * If the array is shrinking we should possibly wait until | |
2988 | * any io in the removed space completes, but it hardly seems | |
2989 | * worth it. | |
2990 | */ | |
a4a6125a N |
2991 | sector_t newsize = raid1_size(mddev, sectors, 0); |
2992 | if (mddev->external_size && | |
2993 | mddev->array_sectors > newsize) | |
b522adcd | 2994 | return -EINVAL; |
a4a6125a N |
2995 | if (mddev->bitmap) { |
2996 | int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); | |
2997 | if (ret) | |
2998 | return ret; | |
2999 | } | |
3000 | md_set_array_sectors(mddev, newsize); | |
f233ea5c | 3001 | set_capacity(mddev->gendisk, mddev->array_sectors); |
449aad3e | 3002 | revalidate_disk(mddev->gendisk); |
b522adcd | 3003 | if (sectors > mddev->dev_sectors && |
b098636c | 3004 | mddev->recovery_cp > mddev->dev_sectors) { |
58c0fed4 | 3005 | mddev->recovery_cp = mddev->dev_sectors; |
1da177e4 LT |
3006 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3007 | } | |
b522adcd | 3008 | mddev->dev_sectors = sectors; |
4b5c7ae8 | 3009 | mddev->resync_max_sectors = sectors; |
1da177e4 LT |
3010 | return 0; |
3011 | } | |
3012 | ||
fd01b88c | 3013 | static int raid1_reshape(struct mddev *mddev) |
1da177e4 LT |
3014 | { |
3015 | /* We need to: | |
3016 | * 1/ resize the r1bio_pool | |
3017 | * 2/ resize conf->mirrors | |
3018 | * | |
3019 | * We allocate a new r1bio_pool if we can. | |
3020 | * Then raise a device barrier and wait until all IO stops. | |
3021 | * Then resize conf->mirrors and swap in the new r1bio pool. | |
6ea9c07c N |
3022 | * |
3023 | * At the same time, we "pack" the devices so that all the missing | |
3024 | * devices have the higher raid_disk numbers. | |
1da177e4 LT |
3025 | */ |
3026 | mempool_t *newpool, *oldpool; | |
3027 | struct pool_info *newpoolinfo; | |
0eaf822c | 3028 | struct raid1_info *newmirrors; |
e8096360 | 3029 | struct r1conf *conf = mddev->private; |
63c70c4f | 3030 | int cnt, raid_disks; |
c04be0aa | 3031 | unsigned long flags; |
b5470dc5 | 3032 | int d, d2, err; |
1da177e4 | 3033 | |
63c70c4f | 3034 | /* Cannot change chunk_size, layout, or level */ |
664e7c41 | 3035 | if (mddev->chunk_sectors != mddev->new_chunk_sectors || |
63c70c4f N |
3036 | mddev->layout != mddev->new_layout || |
3037 | mddev->level != mddev->new_level) { | |
664e7c41 | 3038 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
63c70c4f N |
3039 | mddev->new_layout = mddev->layout; |
3040 | mddev->new_level = mddev->level; | |
3041 | return -EINVAL; | |
3042 | } | |
3043 | ||
b5470dc5 DW |
3044 | err = md_allow_write(mddev); |
3045 | if (err) | |
3046 | return err; | |
2a2275d6 | 3047 | |
63c70c4f N |
3048 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3049 | ||
6ea9c07c N |
3050 | if (raid_disks < conf->raid_disks) { |
3051 | cnt=0; | |
3052 | for (d= 0; d < conf->raid_disks; d++) | |
3053 | if (conf->mirrors[d].rdev) | |
3054 | cnt++; | |
3055 | if (cnt > raid_disks) | |
1da177e4 | 3056 | return -EBUSY; |
6ea9c07c | 3057 | } |
1da177e4 LT |
3058 | |
3059 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3060 | if (!newpoolinfo) | |
3061 | return -ENOMEM; | |
3062 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3063 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
3064 | |
3065 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
3066 | r1bio_pool_free, newpoolinfo); | |
3067 | if (!newpool) { | |
3068 | kfree(newpoolinfo); | |
3069 | return -ENOMEM; | |
3070 | } | |
0eaf822c | 3071 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 3072 | GFP_KERNEL); |
1da177e4 LT |
3073 | if (!newmirrors) { |
3074 | kfree(newpoolinfo); | |
3075 | mempool_destroy(newpool); | |
3076 | return -ENOMEM; | |
3077 | } | |
1da177e4 | 3078 | |
e2d59925 | 3079 | freeze_array(conf, 0); |
1da177e4 LT |
3080 | |
3081 | /* ok, everything is stopped */ | |
3082 | oldpool = conf->r1bio_pool; | |
3083 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3084 | |
a88aa786 | 3085 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3086 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3087 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3088 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3089 | rdev->raid_disk = d2; |
36fad858 NK |
3090 | sysfs_unlink_rdev(mddev, rdev); |
3091 | if (sysfs_link_rdev(mddev, rdev)) | |
a88aa786 | 3092 | printk(KERN_WARNING |
36fad858 NK |
3093 | "md/raid1:%s: cannot register rd%d\n", |
3094 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3095 | } |
a88aa786 N |
3096 | if (rdev) |
3097 | newmirrors[d2++].rdev = rdev; | |
3098 | } | |
1da177e4 LT |
3099 | kfree(conf->mirrors); |
3100 | conf->mirrors = newmirrors; | |
3101 | kfree(conf->poolinfo); | |
3102 | conf->poolinfo = newpoolinfo; | |
3103 | ||
c04be0aa | 3104 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3105 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3106 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3107 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3108 | mddev->delta_disks = 0; |
1da177e4 | 3109 | |
e2d59925 | 3110 | unfreeze_array(conf); |
1da177e4 LT |
3111 | |
3112 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3113 | md_wakeup_thread(mddev->thread); | |
3114 | ||
3115 | mempool_destroy(oldpool); | |
3116 | return 0; | |
3117 | } | |
3118 | ||
fd01b88c | 3119 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3120 | { |
e8096360 | 3121 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3122 | |
3123 | switch(state) { | |
6eef4b21 N |
3124 | case 2: /* wake for suspend */ |
3125 | wake_up(&conf->wait_barrier); | |
3126 | break; | |
9e6603da | 3127 | case 1: |
07169fd4 | 3128 | freeze_array(conf, 0); |
36fa3063 | 3129 | break; |
9e6603da | 3130 | case 0: |
07169fd4 | 3131 | unfreeze_array(conf); |
36fa3063 N |
3132 | break; |
3133 | } | |
36fa3063 N |
3134 | } |
3135 | ||
fd01b88c | 3136 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3137 | { |
3138 | /* raid1 can take over: | |
3139 | * raid5 with 2 devices, any layout or chunk size | |
3140 | */ | |
3141 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3142 | struct r1conf *conf; |
709ae487 N |
3143 | mddev->new_level = 1; |
3144 | mddev->new_layout = 0; | |
3145 | mddev->new_chunk_sectors = 0; | |
3146 | conf = setup_conf(mddev); | |
3147 | if (!IS_ERR(conf)) | |
07169fd4 | 3148 | /* Array must appear to be quiesced */ |
3149 | conf->array_frozen = 1; | |
709ae487 N |
3150 | return conf; |
3151 | } | |
3152 | return ERR_PTR(-EINVAL); | |
3153 | } | |
1da177e4 | 3154 | |
84fc4b56 | 3155 | static struct md_personality raid1_personality = |
1da177e4 LT |
3156 | { |
3157 | .name = "raid1", | |
2604b703 | 3158 | .level = 1, |
1da177e4 LT |
3159 | .owner = THIS_MODULE, |
3160 | .make_request = make_request, | |
3161 | .run = run, | |
afa0f557 | 3162 | .free = raid1_free, |
1da177e4 LT |
3163 | .status = status, |
3164 | .error_handler = error, | |
3165 | .hot_add_disk = raid1_add_disk, | |
3166 | .hot_remove_disk= raid1_remove_disk, | |
3167 | .spare_active = raid1_spare_active, | |
3168 | .sync_request = sync_request, | |
3169 | .resize = raid1_resize, | |
80c3a6ce | 3170 | .size = raid1_size, |
63c70c4f | 3171 | .check_reshape = raid1_reshape, |
36fa3063 | 3172 | .quiesce = raid1_quiesce, |
709ae487 | 3173 | .takeover = raid1_takeover, |
5c675f83 | 3174 | .congested = raid1_congested, |
64590f45 | 3175 | .mergeable_bvec = raid1_mergeable_bvec, |
1da177e4 LT |
3176 | }; |
3177 | ||
3178 | static int __init raid_init(void) | |
3179 | { | |
2604b703 | 3180 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3181 | } |
3182 | ||
3183 | static void raid_exit(void) | |
3184 | { | |
2604b703 | 3185 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3186 | } |
3187 | ||
3188 | module_init(raid_init); | |
3189 | module_exit(raid_exit); | |
3190 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3191 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3192 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3193 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3194 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3195 | |
3196 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |