Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * raid1.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat | |
5 | * | |
6 | * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman | |
7 | * | |
8 | * RAID-1 management functions. | |
9 | * | |
10 | * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 | |
11 | * | |
96de0e25 | 12 | * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> |
1da177e4 LT |
13 | * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> |
14 | * | |
191ea9b2 N |
15 | * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support |
16 | * bitmapped intelligence in resync: | |
17 | * | |
18 | * - bitmap marked during normal i/o | |
19 | * - bitmap used to skip nondirty blocks during sync | |
20 | * | |
21 | * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: | |
22 | * - persistent bitmap code | |
23 | * | |
1da177e4 LT |
24 | * This program is free software; you can redistribute it and/or modify |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2, or (at your option) | |
27 | * any later version. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
31 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
25570727 | 35 | #include <linux/delay.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
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) | |
c40f341f GR |
93 | #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) |
94 | #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) | |
8e005f7c | 95 | #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS) |
1da177e4 | 96 | |
dd0fc66f | 97 | static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 LT |
98 | { |
99 | struct pool_info *pi = data; | |
9f2c9d12 | 100 | struct r1bio *r1_bio; |
1da177e4 | 101 | struct bio *bio; |
da1aab3d | 102 | int need_pages; |
1da177e4 LT |
103 | int i, j; |
104 | ||
105 | r1_bio = r1bio_pool_alloc(gfp_flags, pi); | |
7eaceacc | 106 | if (!r1_bio) |
1da177e4 | 107 | return NULL; |
1da177e4 LT |
108 | |
109 | /* | |
110 | * Allocate bios : 1 for reading, n-1 for writing | |
111 | */ | |
112 | for (j = pi->raid_disks ; j-- ; ) { | |
6746557f | 113 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
114 | if (!bio) |
115 | goto out_free_bio; | |
116 | r1_bio->bios[j] = bio; | |
117 | } | |
118 | /* | |
119 | * Allocate RESYNC_PAGES data pages and attach them to | |
d11c171e N |
120 | * the first bio. |
121 | * If this is a user-requested check/repair, allocate | |
122 | * RESYNC_PAGES for each bio. | |
1da177e4 | 123 | */ |
d11c171e | 124 | if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) |
da1aab3d | 125 | need_pages = pi->raid_disks; |
d11c171e | 126 | else |
da1aab3d N |
127 | need_pages = 1; |
128 | for (j = 0; j < need_pages; j++) { | |
d11c171e | 129 | bio = r1_bio->bios[j]; |
a0787606 | 130 | bio->bi_vcnt = RESYNC_PAGES; |
d11c171e | 131 | |
a0787606 | 132 | if (bio_alloc_pages(bio, gfp_flags)) |
da1aab3d | 133 | goto out_free_pages; |
d11c171e N |
134 | } |
135 | /* If not user-requests, copy the page pointers to all bios */ | |
136 | if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { | |
137 | for (i=0; i<RESYNC_PAGES ; i++) | |
138 | for (j=1; j<pi->raid_disks; j++) | |
139 | r1_bio->bios[j]->bi_io_vec[i].bv_page = | |
140 | r1_bio->bios[0]->bi_io_vec[i].bv_page; | |
1da177e4 LT |
141 | } |
142 | ||
143 | r1_bio->master_bio = NULL; | |
144 | ||
145 | return r1_bio; | |
146 | ||
da1aab3d | 147 | out_free_pages: |
491221f8 GJ |
148 | while (--j >= 0) |
149 | bio_free_pages(r1_bio->bios[j]); | |
da1aab3d | 150 | |
1da177e4 | 151 | out_free_bio: |
8f19ccb2 | 152 | while (++j < pi->raid_disks) |
1da177e4 LT |
153 | bio_put(r1_bio->bios[j]); |
154 | r1bio_pool_free(r1_bio, data); | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | static void r1buf_pool_free(void *__r1_bio, void *data) | |
159 | { | |
160 | struct pool_info *pi = data; | |
d11c171e | 161 | int i,j; |
9f2c9d12 | 162 | struct r1bio *r1bio = __r1_bio; |
1da177e4 | 163 | |
d11c171e N |
164 | for (i = 0; i < RESYNC_PAGES; i++) |
165 | for (j = pi->raid_disks; j-- ;) { | |
166 | if (j == 0 || | |
167 | r1bio->bios[j]->bi_io_vec[i].bv_page != | |
168 | r1bio->bios[0]->bi_io_vec[i].bv_page) | |
1345b1d8 | 169 | safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); |
d11c171e | 170 | } |
1da177e4 LT |
171 | for (i=0 ; i < pi->raid_disks; i++) |
172 | bio_put(r1bio->bios[i]); | |
173 | ||
174 | r1bio_pool_free(r1bio, data); | |
175 | } | |
176 | ||
e8096360 | 177 | static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) |
1da177e4 LT |
178 | { |
179 | int i; | |
180 | ||
8f19ccb2 | 181 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 | 182 | struct bio **bio = r1_bio->bios + i; |
4367af55 | 183 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
184 | bio_put(*bio); |
185 | *bio = NULL; | |
186 | } | |
187 | } | |
188 | ||
9f2c9d12 | 189 | static void free_r1bio(struct r1bio *r1_bio) |
1da177e4 | 190 | { |
e8096360 | 191 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 | 192 | |
1da177e4 LT |
193 | put_all_bios(conf, r1_bio); |
194 | mempool_free(r1_bio, conf->r1bio_pool); | |
195 | } | |
196 | ||
9f2c9d12 | 197 | static void put_buf(struct r1bio *r1_bio) |
1da177e4 | 198 | { |
e8096360 | 199 | struct r1conf *conf = r1_bio->mddev->private; |
3e198f78 N |
200 | int i; |
201 | ||
8f19ccb2 | 202 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3e198f78 N |
203 | struct bio *bio = r1_bio->bios[i]; |
204 | if (bio->bi_end_io) | |
205 | rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); | |
206 | } | |
1da177e4 LT |
207 | |
208 | mempool_free(r1_bio, conf->r1buf_pool); | |
209 | ||
17999be4 | 210 | lower_barrier(conf); |
1da177e4 LT |
211 | } |
212 | ||
9f2c9d12 | 213 | static void reschedule_retry(struct r1bio *r1_bio) |
1da177e4 LT |
214 | { |
215 | unsigned long flags; | |
fd01b88c | 216 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 217 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
218 | |
219 | spin_lock_irqsave(&conf->device_lock, flags); | |
220 | list_add(&r1_bio->retry_list, &conf->retry_list); | |
ddaf22ab | 221 | conf->nr_queued ++; |
1da177e4 LT |
222 | spin_unlock_irqrestore(&conf->device_lock, flags); |
223 | ||
17999be4 | 224 | wake_up(&conf->wait_barrier); |
1da177e4 LT |
225 | md_wakeup_thread(mddev->thread); |
226 | } | |
227 | ||
228 | /* | |
229 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
230 | * operation and are ready to return a success/failure code to the buffer | |
231 | * cache layer. | |
232 | */ | |
9f2c9d12 | 233 | static void call_bio_endio(struct r1bio *r1_bio) |
d2eb35ac N |
234 | { |
235 | struct bio *bio = r1_bio->master_bio; | |
236 | int done; | |
e8096360 | 237 | struct r1conf *conf = r1_bio->mddev->private; |
79ef3a8a | 238 | sector_t start_next_window = r1_bio->start_next_window; |
4f024f37 | 239 | sector_t bi_sector = bio->bi_iter.bi_sector; |
d2eb35ac N |
240 | |
241 | if (bio->bi_phys_segments) { | |
242 | unsigned long flags; | |
243 | spin_lock_irqsave(&conf->device_lock, flags); | |
244 | bio->bi_phys_segments--; | |
245 | done = (bio->bi_phys_segments == 0); | |
246 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
79ef3a8a | 247 | /* |
248 | * make_request() might be waiting for | |
249 | * bi_phys_segments to decrease | |
250 | */ | |
251 | wake_up(&conf->wait_barrier); | |
d2eb35ac N |
252 | } else |
253 | done = 1; | |
254 | ||
255 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) | |
4246a0b6 CH |
256 | bio->bi_error = -EIO; |
257 | ||
d2eb35ac | 258 | if (done) { |
4246a0b6 | 259 | bio_endio(bio); |
d2eb35ac N |
260 | /* |
261 | * Wake up any possible resync thread that waits for the device | |
262 | * to go idle. | |
263 | */ | |
79ef3a8a | 264 | allow_barrier(conf, start_next_window, bi_sector); |
d2eb35ac N |
265 | } |
266 | } | |
267 | ||
9f2c9d12 | 268 | static void raid_end_bio_io(struct r1bio *r1_bio) |
1da177e4 LT |
269 | { |
270 | struct bio *bio = r1_bio->master_bio; | |
271 | ||
4b6d287f N |
272 | /* if nobody has done the final endio yet, do it now */ |
273 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
36a4e1fe N |
274 | pr_debug("raid1: sync end %s on sectors %llu-%llu\n", |
275 | (bio_data_dir(bio) == WRITE) ? "write" : "read", | |
4f024f37 KO |
276 | (unsigned long long) bio->bi_iter.bi_sector, |
277 | (unsigned long long) bio_end_sector(bio) - 1); | |
4b6d287f | 278 | |
d2eb35ac | 279 | call_bio_endio(r1_bio); |
4b6d287f | 280 | } |
1da177e4 LT |
281 | free_r1bio(r1_bio); |
282 | } | |
283 | ||
284 | /* | |
285 | * Update disk head position estimator based on IRQ completion info. | |
286 | */ | |
9f2c9d12 | 287 | static inline void update_head_pos(int disk, struct r1bio *r1_bio) |
1da177e4 | 288 | { |
e8096360 | 289 | struct r1conf *conf = r1_bio->mddev->private; |
1da177e4 LT |
290 | |
291 | conf->mirrors[disk].head_position = | |
292 | r1_bio->sector + (r1_bio->sectors); | |
293 | } | |
294 | ||
ba3ae3be NK |
295 | /* |
296 | * Find the disk number which triggered given bio | |
297 | */ | |
9f2c9d12 | 298 | static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) |
ba3ae3be NK |
299 | { |
300 | int mirror; | |
30194636 N |
301 | struct r1conf *conf = r1_bio->mddev->private; |
302 | int raid_disks = conf->raid_disks; | |
ba3ae3be | 303 | |
8f19ccb2 | 304 | for (mirror = 0; mirror < raid_disks * 2; mirror++) |
ba3ae3be NK |
305 | if (r1_bio->bios[mirror] == bio) |
306 | break; | |
307 | ||
8f19ccb2 | 308 | BUG_ON(mirror == raid_disks * 2); |
ba3ae3be NK |
309 | update_head_pos(mirror, r1_bio); |
310 | ||
311 | return mirror; | |
312 | } | |
313 | ||
4246a0b6 | 314 | static void raid1_end_read_request(struct bio *bio) |
1da177e4 | 315 | { |
4246a0b6 | 316 | int uptodate = !bio->bi_error; |
9f2c9d12 | 317 | struct r1bio *r1_bio = bio->bi_private; |
e8096360 | 318 | struct r1conf *conf = r1_bio->mddev->private; |
e5872d58 | 319 | struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; |
1da177e4 | 320 | |
1da177e4 LT |
321 | /* |
322 | * this branch is our 'one mirror IO has finished' event handler: | |
323 | */ | |
e5872d58 | 324 | update_head_pos(r1_bio->read_disk, r1_bio); |
ddaf22ab | 325 | |
dd00a99e N |
326 | if (uptodate) |
327 | set_bit(R1BIO_Uptodate, &r1_bio->state); | |
328 | else { | |
329 | /* If all other devices have failed, we want to return | |
330 | * the error upwards rather than fail the last device. | |
331 | * Here we redefine "uptodate" to mean "Don't want to retry" | |
1da177e4 | 332 | */ |
dd00a99e N |
333 | unsigned long flags; |
334 | spin_lock_irqsave(&conf->device_lock, flags); | |
335 | if (r1_bio->mddev->degraded == conf->raid_disks || | |
336 | (r1_bio->mddev->degraded == conf->raid_disks-1 && | |
e5872d58 | 337 | test_bit(In_sync, &rdev->flags))) |
dd00a99e N |
338 | uptodate = 1; |
339 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
340 | } | |
1da177e4 | 341 | |
7ad4d4a6 | 342 | if (uptodate) { |
1da177e4 | 343 | raid_end_bio_io(r1_bio); |
e5872d58 | 344 | rdev_dec_pending(rdev, conf->mddev); |
7ad4d4a6 | 345 | } else { |
1da177e4 LT |
346 | /* |
347 | * oops, read error: | |
348 | */ | |
349 | char b[BDEVNAME_SIZE]; | |
1d41c216 N |
350 | pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", |
351 | mdname(conf->mddev), | |
352 | bdevname(rdev->bdev, b), | |
353 | (unsigned long long)r1_bio->sector); | |
d2eb35ac | 354 | set_bit(R1BIO_ReadError, &r1_bio->state); |
1da177e4 | 355 | reschedule_retry(r1_bio); |
7ad4d4a6 | 356 | /* don't drop the reference on read_disk yet */ |
1da177e4 | 357 | } |
1da177e4 LT |
358 | } |
359 | ||
9f2c9d12 | 360 | static void close_write(struct r1bio *r1_bio) |
cd5ff9a1 N |
361 | { |
362 | /* it really is the end of this request */ | |
363 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { | |
364 | /* free extra copy of the data pages */ | |
365 | int i = r1_bio->behind_page_count; | |
366 | while (i--) | |
367 | safe_put_page(r1_bio->behind_bvecs[i].bv_page); | |
368 | kfree(r1_bio->behind_bvecs); | |
369 | r1_bio->behind_bvecs = NULL; | |
370 | } | |
371 | /* clear the bitmap if all writes complete successfully */ | |
372 | bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, | |
373 | r1_bio->sectors, | |
374 | !test_bit(R1BIO_Degraded, &r1_bio->state), | |
375 | test_bit(R1BIO_BehindIO, &r1_bio->state)); | |
376 | md_write_end(r1_bio->mddev); | |
377 | } | |
378 | ||
9f2c9d12 | 379 | static void r1_bio_write_done(struct r1bio *r1_bio) |
4e78064f | 380 | { |
cd5ff9a1 N |
381 | if (!atomic_dec_and_test(&r1_bio->remaining)) |
382 | return; | |
383 | ||
384 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
385 | reschedule_retry(r1_bio); | |
386 | else { | |
387 | close_write(r1_bio); | |
4367af55 N |
388 | if (test_bit(R1BIO_MadeGood, &r1_bio->state)) |
389 | reschedule_retry(r1_bio); | |
390 | else | |
391 | raid_end_bio_io(r1_bio); | |
4e78064f N |
392 | } |
393 | } | |
394 | ||
4246a0b6 | 395 | static void raid1_end_write_request(struct bio *bio) |
1da177e4 | 396 | { |
9f2c9d12 | 397 | struct r1bio *r1_bio = bio->bi_private; |
e5872d58 | 398 | int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); |
e8096360 | 399 | struct r1conf *conf = r1_bio->mddev->private; |
04b857f7 | 400 | struct bio *to_put = NULL; |
e5872d58 N |
401 | int mirror = find_bio_disk(r1_bio, bio); |
402 | struct md_rdev *rdev = conf->mirrors[mirror].rdev; | |
e3f948cd SL |
403 | bool discard_error; |
404 | ||
405 | discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; | |
1da177e4 | 406 | |
e9c7469b TH |
407 | /* |
408 | * 'one mirror IO has finished' event handler: | |
409 | */ | |
e3f948cd | 410 | if (bio->bi_error && !discard_error) { |
e5872d58 N |
411 | set_bit(WriteErrorSeen, &rdev->flags); |
412 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
413 | set_bit(MD_RECOVERY_NEEDED, & |
414 | conf->mddev->recovery); | |
415 | ||
cd5ff9a1 | 416 | set_bit(R1BIO_WriteError, &r1_bio->state); |
4367af55 | 417 | } else { |
1da177e4 | 418 | /* |
e9c7469b TH |
419 | * Set R1BIO_Uptodate in our master bio, so that we |
420 | * will return a good error code for to the higher | |
421 | * levels even if IO on some other mirrored buffer | |
422 | * fails. | |
423 | * | |
424 | * The 'master' represents the composite IO operation | |
425 | * to user-side. So if something waits for IO, then it | |
426 | * will wait for the 'master' bio. | |
1da177e4 | 427 | */ |
4367af55 N |
428 | sector_t first_bad; |
429 | int bad_sectors; | |
430 | ||
cd5ff9a1 N |
431 | r1_bio->bios[mirror] = NULL; |
432 | to_put = bio; | |
3056e3ae AL |
433 | /* |
434 | * Do not set R1BIO_Uptodate if the current device is | |
435 | * rebuilding or Faulty. This is because we cannot use | |
436 | * such device for properly reading the data back (we could | |
437 | * potentially use it, if the current write would have felt | |
438 | * before rdev->recovery_offset, but for simplicity we don't | |
439 | * check this here. | |
440 | */ | |
e5872d58 N |
441 | if (test_bit(In_sync, &rdev->flags) && |
442 | !test_bit(Faulty, &rdev->flags)) | |
3056e3ae | 443 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
e9c7469b | 444 | |
4367af55 | 445 | /* Maybe we can clear some bad blocks. */ |
e5872d58 | 446 | if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
e3f948cd | 447 | &first_bad, &bad_sectors) && !discard_error) { |
4367af55 N |
448 | r1_bio->bios[mirror] = IO_MADE_GOOD; |
449 | set_bit(R1BIO_MadeGood, &r1_bio->state); | |
450 | } | |
451 | } | |
452 | ||
e9c7469b | 453 | if (behind) { |
e5872d58 | 454 | if (test_bit(WriteMostly, &rdev->flags)) |
e9c7469b TH |
455 | atomic_dec(&r1_bio->behind_remaining); |
456 | ||
457 | /* | |
458 | * In behind mode, we ACK the master bio once the I/O | |
459 | * has safely reached all non-writemostly | |
460 | * disks. Setting the Returned bit ensures that this | |
461 | * gets done only once -- we don't ever want to return | |
462 | * -EIO here, instead we'll wait | |
463 | */ | |
464 | if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && | |
465 | test_bit(R1BIO_Uptodate, &r1_bio->state)) { | |
466 | /* Maybe we can return now */ | |
467 | if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { | |
468 | struct bio *mbio = r1_bio->master_bio; | |
36a4e1fe N |
469 | pr_debug("raid1: behind end write sectors" |
470 | " %llu-%llu\n", | |
4f024f37 KO |
471 | (unsigned long long) mbio->bi_iter.bi_sector, |
472 | (unsigned long long) bio_end_sector(mbio) - 1); | |
d2eb35ac | 473 | call_bio_endio(r1_bio); |
4b6d287f N |
474 | } |
475 | } | |
476 | } | |
4367af55 | 477 | if (r1_bio->bios[mirror] == NULL) |
e5872d58 | 478 | rdev_dec_pending(rdev, conf->mddev); |
e9c7469b | 479 | |
1da177e4 | 480 | /* |
1da177e4 LT |
481 | * Let's see if all mirrored write operations have finished |
482 | * already. | |
483 | */ | |
af6d7b76 | 484 | r1_bio_write_done(r1_bio); |
c70810b3 | 485 | |
04b857f7 N |
486 | if (to_put) |
487 | bio_put(to_put); | |
1da177e4 LT |
488 | } |
489 | ||
1da177e4 LT |
490 | /* |
491 | * This routine returns the disk from which the requested read should | |
492 | * be done. There is a per-array 'next expected sequential IO' sector | |
493 | * number - if this matches on the next IO then we use the last disk. | |
494 | * There is also a per-disk 'last know head position' sector that is | |
495 | * maintained from IRQ contexts, both the normal and the resync IO | |
496 | * completion handlers update this position correctly. If there is no | |
497 | * perfect sequential match then we pick the disk whose head is closest. | |
498 | * | |
499 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
500 | * because position is mirror, not device based. | |
501 | * | |
502 | * The rdev for the device selected will have nr_pending incremented. | |
503 | */ | |
e8096360 | 504 | static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) |
1da177e4 | 505 | { |
af3a2cd6 | 506 | const sector_t this_sector = r1_bio->sector; |
d2eb35ac N |
507 | int sectors; |
508 | int best_good_sectors; | |
9dedf603 SL |
509 | int best_disk, best_dist_disk, best_pending_disk; |
510 | int has_nonrot_disk; | |
be4d3280 | 511 | int disk; |
76073054 | 512 | sector_t best_dist; |
9dedf603 | 513 | unsigned int min_pending; |
3cb03002 | 514 | struct md_rdev *rdev; |
f3ac8bf7 | 515 | int choose_first; |
12cee5a8 | 516 | int choose_next_idle; |
1da177e4 LT |
517 | |
518 | rcu_read_lock(); | |
519 | /* | |
8ddf9efe | 520 | * Check if we can balance. We can balance on the whole |
1da177e4 LT |
521 | * device if no resync is going on, or below the resync window. |
522 | * We take the first readable disk when above the resync window. | |
523 | */ | |
524 | retry: | |
d2eb35ac | 525 | sectors = r1_bio->sectors; |
76073054 | 526 | best_disk = -1; |
9dedf603 | 527 | best_dist_disk = -1; |
76073054 | 528 | best_dist = MaxSector; |
9dedf603 SL |
529 | best_pending_disk = -1; |
530 | min_pending = UINT_MAX; | |
d2eb35ac | 531 | best_good_sectors = 0; |
9dedf603 | 532 | has_nonrot_disk = 0; |
12cee5a8 | 533 | choose_next_idle = 0; |
d2eb35ac | 534 | |
7d49ffcf GR |
535 | if ((conf->mddev->recovery_cp < this_sector + sectors) || |
536 | (mddev_is_clustered(conf->mddev) && | |
90382ed9 | 537 | md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, |
7d49ffcf GR |
538 | this_sector + sectors))) |
539 | choose_first = 1; | |
540 | else | |
541 | choose_first = 0; | |
1da177e4 | 542 | |
be4d3280 | 543 | for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { |
76073054 | 544 | sector_t dist; |
d2eb35ac N |
545 | sector_t first_bad; |
546 | int bad_sectors; | |
9dedf603 | 547 | unsigned int pending; |
12cee5a8 | 548 | bool nonrot; |
d2eb35ac | 549 | |
f3ac8bf7 N |
550 | rdev = rcu_dereference(conf->mirrors[disk].rdev); |
551 | if (r1_bio->bios[disk] == IO_BLOCKED | |
552 | || rdev == NULL | |
76073054 | 553 | || test_bit(Faulty, &rdev->flags)) |
f3ac8bf7 | 554 | continue; |
76073054 N |
555 | if (!test_bit(In_sync, &rdev->flags) && |
556 | rdev->recovery_offset < this_sector + sectors) | |
1da177e4 | 557 | continue; |
76073054 N |
558 | if (test_bit(WriteMostly, &rdev->flags)) { |
559 | /* Don't balance among write-mostly, just | |
560 | * use the first as a last resort */ | |
d1901ef0 | 561 | if (best_dist_disk < 0) { |
307729c8 N |
562 | if (is_badblock(rdev, this_sector, sectors, |
563 | &first_bad, &bad_sectors)) { | |
816b0acf | 564 | if (first_bad <= this_sector) |
307729c8 N |
565 | /* Cannot use this */ |
566 | continue; | |
567 | best_good_sectors = first_bad - this_sector; | |
568 | } else | |
569 | best_good_sectors = sectors; | |
d1901ef0 TH |
570 | best_dist_disk = disk; |
571 | best_pending_disk = disk; | |
307729c8 | 572 | } |
76073054 N |
573 | continue; |
574 | } | |
575 | /* This is a reasonable device to use. It might | |
576 | * even be best. | |
577 | */ | |
d2eb35ac N |
578 | if (is_badblock(rdev, this_sector, sectors, |
579 | &first_bad, &bad_sectors)) { | |
580 | if (best_dist < MaxSector) | |
581 | /* already have a better device */ | |
582 | continue; | |
583 | if (first_bad <= this_sector) { | |
584 | /* cannot read here. If this is the 'primary' | |
585 | * device, then we must not read beyond | |
586 | * bad_sectors from another device.. | |
587 | */ | |
588 | bad_sectors -= (this_sector - first_bad); | |
589 | if (choose_first && sectors > bad_sectors) | |
590 | sectors = bad_sectors; | |
591 | if (best_good_sectors > sectors) | |
592 | best_good_sectors = sectors; | |
593 | ||
594 | } else { | |
595 | sector_t good_sectors = first_bad - this_sector; | |
596 | if (good_sectors > best_good_sectors) { | |
597 | best_good_sectors = good_sectors; | |
598 | best_disk = disk; | |
599 | } | |
600 | if (choose_first) | |
601 | break; | |
602 | } | |
603 | continue; | |
604 | } else | |
605 | best_good_sectors = sectors; | |
606 | ||
12cee5a8 SL |
607 | nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); |
608 | has_nonrot_disk |= nonrot; | |
9dedf603 | 609 | pending = atomic_read(&rdev->nr_pending); |
76073054 | 610 | dist = abs(this_sector - conf->mirrors[disk].head_position); |
12cee5a8 | 611 | if (choose_first) { |
76073054 | 612 | best_disk = disk; |
1da177e4 LT |
613 | break; |
614 | } | |
12cee5a8 SL |
615 | /* Don't change to another disk for sequential reads */ |
616 | if (conf->mirrors[disk].next_seq_sect == this_sector | |
617 | || dist == 0) { | |
618 | int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; | |
619 | struct raid1_info *mirror = &conf->mirrors[disk]; | |
620 | ||
621 | best_disk = disk; | |
622 | /* | |
623 | * If buffered sequential IO size exceeds optimal | |
624 | * iosize, check if there is idle disk. If yes, choose | |
625 | * the idle disk. read_balance could already choose an | |
626 | * idle disk before noticing it's a sequential IO in | |
627 | * this disk. This doesn't matter because this disk | |
628 | * will idle, next time it will be utilized after the | |
629 | * first disk has IO size exceeds optimal iosize. In | |
630 | * this way, iosize of the first disk will be optimal | |
631 | * iosize at least. iosize of the second disk might be | |
632 | * small, but not a big deal since when the second disk | |
633 | * starts IO, the first disk is likely still busy. | |
634 | */ | |
635 | if (nonrot && opt_iosize > 0 && | |
636 | mirror->seq_start != MaxSector && | |
637 | mirror->next_seq_sect > opt_iosize && | |
638 | mirror->next_seq_sect - opt_iosize >= | |
639 | mirror->seq_start) { | |
640 | choose_next_idle = 1; | |
641 | continue; | |
642 | } | |
643 | break; | |
644 | } | |
645 | /* If device is idle, use it */ | |
646 | if (pending == 0) { | |
647 | best_disk = disk; | |
648 | break; | |
649 | } | |
650 | ||
651 | if (choose_next_idle) | |
652 | continue; | |
9dedf603 SL |
653 | |
654 | if (min_pending > pending) { | |
655 | min_pending = pending; | |
656 | best_pending_disk = disk; | |
657 | } | |
658 | ||
76073054 N |
659 | if (dist < best_dist) { |
660 | best_dist = dist; | |
9dedf603 | 661 | best_dist_disk = disk; |
1da177e4 | 662 | } |
f3ac8bf7 | 663 | } |
1da177e4 | 664 | |
9dedf603 SL |
665 | /* |
666 | * If all disks are rotational, choose the closest disk. If any disk is | |
667 | * non-rotational, choose the disk with less pending request even the | |
668 | * disk is rotational, which might/might not be optimal for raids with | |
669 | * mixed ratation/non-rotational disks depending on workload. | |
670 | */ | |
671 | if (best_disk == -1) { | |
672 | if (has_nonrot_disk) | |
673 | best_disk = best_pending_disk; | |
674 | else | |
675 | best_disk = best_dist_disk; | |
676 | } | |
677 | ||
76073054 N |
678 | if (best_disk >= 0) { |
679 | rdev = rcu_dereference(conf->mirrors[best_disk].rdev); | |
8ddf9efe N |
680 | if (!rdev) |
681 | goto retry; | |
682 | atomic_inc(&rdev->nr_pending); | |
d2eb35ac | 683 | sectors = best_good_sectors; |
12cee5a8 SL |
684 | |
685 | if (conf->mirrors[best_disk].next_seq_sect != this_sector) | |
686 | conf->mirrors[best_disk].seq_start = this_sector; | |
687 | ||
be4d3280 | 688 | conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; |
1da177e4 LT |
689 | } |
690 | rcu_read_unlock(); | |
d2eb35ac | 691 | *max_sectors = sectors; |
1da177e4 | 692 | |
76073054 | 693 | return best_disk; |
1da177e4 LT |
694 | } |
695 | ||
5c675f83 | 696 | static int raid1_congested(struct mddev *mddev, int bits) |
0d129228 | 697 | { |
e8096360 | 698 | struct r1conf *conf = mddev->private; |
0d129228 N |
699 | int i, ret = 0; |
700 | ||
4452226e | 701 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
702 | conf->pending_count >= max_queued_requests) |
703 | return 1; | |
704 | ||
0d129228 | 705 | rcu_read_lock(); |
f53e29fc | 706 | for (i = 0; i < conf->raid_disks * 2; i++) { |
3cb03002 | 707 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 708 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 709 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 710 | |
1ed7242e JB |
711 | BUG_ON(!q); |
712 | ||
0d129228 N |
713 | /* Note the '|| 1' - when read_balance prefers |
714 | * non-congested targets, it can be removed | |
715 | */ | |
4452226e | 716 | if ((bits & (1 << WB_async_congested)) || 1) |
0d129228 N |
717 | ret |= bdi_congested(&q->backing_dev_info, bits); |
718 | else | |
719 | ret &= bdi_congested(&q->backing_dev_info, bits); | |
720 | } | |
721 | } | |
722 | rcu_read_unlock(); | |
723 | return ret; | |
724 | } | |
0d129228 | 725 | |
e8096360 | 726 | static void flush_pending_writes(struct r1conf *conf) |
a35e63ef N |
727 | { |
728 | /* Any writes that have been queued but are awaiting | |
729 | * bitmap updates get flushed here. | |
a35e63ef | 730 | */ |
a35e63ef N |
731 | spin_lock_irq(&conf->device_lock); |
732 | ||
733 | if (conf->pending_bio_list.head) { | |
734 | struct bio *bio; | |
735 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 736 | conf->pending_count = 0; |
a35e63ef N |
737 | spin_unlock_irq(&conf->device_lock); |
738 | /* flush any pending bitmap writes to | |
739 | * disk before proceeding w/ I/O */ | |
740 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 741 | wake_up(&conf->wait_barrier); |
a35e63ef N |
742 | |
743 | while (bio) { /* submit pending writes */ | |
744 | struct bio *next = bio->bi_next; | |
745 | bio->bi_next = NULL; | |
796a5cf0 | 746 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
2ff8cc2c SL |
747 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) |
748 | /* Just ignore it */ | |
4246a0b6 | 749 | bio_endio(bio); |
2ff8cc2c SL |
750 | else |
751 | generic_make_request(bio); | |
a35e63ef N |
752 | bio = next; |
753 | } | |
a35e63ef N |
754 | } else |
755 | spin_unlock_irq(&conf->device_lock); | |
7eaceacc JA |
756 | } |
757 | ||
17999be4 N |
758 | /* Barriers.... |
759 | * Sometimes we need to suspend IO while we do something else, | |
760 | * either some resync/recovery, or reconfigure the array. | |
761 | * To do this we raise a 'barrier'. | |
762 | * The 'barrier' is a counter that can be raised multiple times | |
763 | * to count how many activities are happening which preclude | |
764 | * normal IO. | |
765 | * We can only raise the barrier if there is no pending IO. | |
766 | * i.e. if nr_pending == 0. | |
767 | * We choose only to raise the barrier if no-one is waiting for the | |
768 | * barrier to go down. This means that as soon as an IO request | |
769 | * is ready, no other operations which require a barrier will start | |
770 | * until the IO request has had a chance. | |
771 | * | |
772 | * So: regular IO calls 'wait_barrier'. When that returns there | |
773 | * is no backgroup IO happening, It must arrange to call | |
774 | * allow_barrier when it has finished its IO. | |
775 | * backgroup IO calls must call raise_barrier. Once that returns | |
776 | * there is no normal IO happeing. It must arrange to call | |
777 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 778 | */ |
c2fd4c94 | 779 | static void raise_barrier(struct r1conf *conf, sector_t sector_nr) |
1da177e4 LT |
780 | { |
781 | spin_lock_irq(&conf->resync_lock); | |
17999be4 N |
782 | |
783 | /* Wait until no block IO is waiting */ | |
784 | wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, | |
eed8c02e | 785 | conf->resync_lock); |
17999be4 N |
786 | |
787 | /* block any new IO from starting */ | |
788 | conf->barrier++; | |
c2fd4c94 | 789 | conf->next_resync = sector_nr; |
17999be4 | 790 | |
79ef3a8a | 791 | /* For these conditions we must wait: |
792 | * A: while the array is in frozen state | |
793 | * B: while barrier >= RESYNC_DEPTH, meaning resync reach | |
794 | * the max count which allowed. | |
795 | * C: next_resync + RESYNC_SECTORS > start_next_window, meaning | |
796 | * next resync will reach to the window which normal bios are | |
797 | * handling. | |
2f73d3c5 | 798 | * D: while there are any active requests in the current window. |
79ef3a8a | 799 | */ |
17999be4 | 800 | wait_event_lock_irq(conf->wait_barrier, |
b364e3d0 | 801 | !conf->array_frozen && |
79ef3a8a | 802 | conf->barrier < RESYNC_DEPTH && |
2f73d3c5 | 803 | conf->current_window_requests == 0 && |
79ef3a8a | 804 | (conf->start_next_window >= |
805 | conf->next_resync + RESYNC_SECTORS), | |
eed8c02e | 806 | conf->resync_lock); |
17999be4 | 807 | |
34e97f17 | 808 | conf->nr_pending++; |
17999be4 N |
809 | spin_unlock_irq(&conf->resync_lock); |
810 | } | |
811 | ||
e8096360 | 812 | static void lower_barrier(struct r1conf *conf) |
17999be4 N |
813 | { |
814 | unsigned long flags; | |
709ae487 | 815 | BUG_ON(conf->barrier <= 0); |
17999be4 N |
816 | spin_lock_irqsave(&conf->resync_lock, flags); |
817 | conf->barrier--; | |
34e97f17 | 818 | conf->nr_pending--; |
17999be4 N |
819 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
820 | wake_up(&conf->wait_barrier); | |
821 | } | |
822 | ||
79ef3a8a | 823 | static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio) |
17999be4 | 824 | { |
79ef3a8a | 825 | bool wait = false; |
826 | ||
827 | if (conf->array_frozen || !bio) | |
828 | wait = true; | |
829 | else if (conf->barrier && bio_data_dir(bio) == WRITE) { | |
23554960 N |
830 | if ((conf->mddev->curr_resync_completed |
831 | >= bio_end_sector(bio)) || | |
832 | (conf->next_resync + NEXT_NORMALIO_DISTANCE | |
833 | <= bio->bi_iter.bi_sector)) | |
79ef3a8a | 834 | wait = false; |
835 | else | |
836 | wait = true; | |
837 | } | |
838 | ||
839 | return wait; | |
840 | } | |
841 | ||
842 | static sector_t wait_barrier(struct r1conf *conf, struct bio *bio) | |
843 | { | |
844 | sector_t sector = 0; | |
845 | ||
17999be4 | 846 | spin_lock_irq(&conf->resync_lock); |
79ef3a8a | 847 | if (need_to_wait_for_sync(conf, bio)) { |
17999be4 | 848 | conf->nr_waiting++; |
d6b42dcb N |
849 | /* Wait for the barrier to drop. |
850 | * However if there are already pending | |
851 | * requests (preventing the barrier from | |
852 | * rising completely), and the | |
5965b642 | 853 | * per-process bio queue isn't empty, |
d6b42dcb | 854 | * then don't wait, as we need to empty |
5965b642 N |
855 | * that queue to allow conf->start_next_window |
856 | * to increase. | |
d6b42dcb N |
857 | */ |
858 | wait_event_lock_irq(conf->wait_barrier, | |
b364e3d0 | 859 | !conf->array_frozen && |
860 | (!conf->barrier || | |
5965b642 N |
861 | ((conf->start_next_window < |
862 | conf->next_resync + RESYNC_SECTORS) && | |
863 | current->bio_list && | |
864 | !bio_list_empty(current->bio_list))), | |
eed8c02e | 865 | conf->resync_lock); |
17999be4 | 866 | conf->nr_waiting--; |
1da177e4 | 867 | } |
79ef3a8a | 868 | |
869 | if (bio && bio_data_dir(bio) == WRITE) { | |
e8ff8bf0 | 870 | if (bio->bi_iter.bi_sector >= conf->next_resync) { |
79ef3a8a | 871 | if (conf->start_next_window == MaxSector) |
872 | conf->start_next_window = | |
873 | conf->next_resync + | |
874 | NEXT_NORMALIO_DISTANCE; | |
875 | ||
876 | if ((conf->start_next_window + NEXT_NORMALIO_DISTANCE) | |
4f024f37 | 877 | <= bio->bi_iter.bi_sector) |
79ef3a8a | 878 | conf->next_window_requests++; |
879 | else | |
880 | conf->current_window_requests++; | |
79ef3a8a | 881 | sector = conf->start_next_window; |
41a336e0 | 882 | } |
79ef3a8a | 883 | } |
884 | ||
17999be4 | 885 | conf->nr_pending++; |
1da177e4 | 886 | spin_unlock_irq(&conf->resync_lock); |
79ef3a8a | 887 | return sector; |
1da177e4 LT |
888 | } |
889 | ||
79ef3a8a | 890 | static void allow_barrier(struct r1conf *conf, sector_t start_next_window, |
891 | sector_t bi_sector) | |
17999be4 N |
892 | { |
893 | unsigned long flags; | |
79ef3a8a | 894 | |
17999be4 N |
895 | spin_lock_irqsave(&conf->resync_lock, flags); |
896 | conf->nr_pending--; | |
79ef3a8a | 897 | if (start_next_window) { |
898 | if (start_next_window == conf->start_next_window) { | |
899 | if (conf->start_next_window + NEXT_NORMALIO_DISTANCE | |
900 | <= bi_sector) | |
901 | conf->next_window_requests--; | |
902 | else | |
903 | conf->current_window_requests--; | |
904 | } else | |
905 | conf->current_window_requests--; | |
906 | ||
907 | if (!conf->current_window_requests) { | |
908 | if (conf->next_window_requests) { | |
909 | conf->current_window_requests = | |
910 | conf->next_window_requests; | |
911 | conf->next_window_requests = 0; | |
912 | conf->start_next_window += | |
913 | NEXT_NORMALIO_DISTANCE; | |
914 | } else | |
915 | conf->start_next_window = MaxSector; | |
916 | } | |
917 | } | |
17999be4 N |
918 | spin_unlock_irqrestore(&conf->resync_lock, flags); |
919 | wake_up(&conf->wait_barrier); | |
920 | } | |
921 | ||
e2d59925 | 922 | static void freeze_array(struct r1conf *conf, int extra) |
ddaf22ab N |
923 | { |
924 | /* stop syncio and normal IO and wait for everything to | |
925 | * go quite. | |
b364e3d0 | 926 | * We wait until nr_pending match nr_queued+extra |
1c830532 N |
927 | * This is called in the context of one normal IO request |
928 | * that has failed. Thus any sync request that might be pending | |
929 | * will be blocked by nr_pending, and we need to wait for | |
930 | * pending IO requests to complete or be queued for re-try. | |
e2d59925 | 931 | * Thus the number queued (nr_queued) plus this request (extra) |
1c830532 N |
932 | * must match the number of pending IOs (nr_pending) before |
933 | * we continue. | |
ddaf22ab N |
934 | */ |
935 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 936 | conf->array_frozen = 1; |
eed8c02e | 937 | wait_event_lock_irq_cmd(conf->wait_barrier, |
e2d59925 | 938 | conf->nr_pending == conf->nr_queued+extra, |
eed8c02e LC |
939 | conf->resync_lock, |
940 | flush_pending_writes(conf)); | |
ddaf22ab N |
941 | spin_unlock_irq(&conf->resync_lock); |
942 | } | |
e8096360 | 943 | static void unfreeze_array(struct r1conf *conf) |
ddaf22ab N |
944 | { |
945 | /* reverse the effect of the freeze */ | |
946 | spin_lock_irq(&conf->resync_lock); | |
b364e3d0 | 947 | conf->array_frozen = 0; |
ddaf22ab N |
948 | wake_up(&conf->wait_barrier); |
949 | spin_unlock_irq(&conf->resync_lock); | |
950 | } | |
951 | ||
f72ffdd6 | 952 | /* duplicate the data pages for behind I/O |
4e78064f | 953 | */ |
9f2c9d12 | 954 | static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) |
4b6d287f N |
955 | { |
956 | int i; | |
957 | struct bio_vec *bvec; | |
2ca68f5e | 958 | struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), |
4b6d287f | 959 | GFP_NOIO); |
2ca68f5e | 960 | if (unlikely(!bvecs)) |
af6d7b76 | 961 | return; |
4b6d287f | 962 | |
cb34e057 | 963 | bio_for_each_segment_all(bvec, bio, i) { |
2ca68f5e N |
964 | bvecs[i] = *bvec; |
965 | bvecs[i].bv_page = alloc_page(GFP_NOIO); | |
966 | if (unlikely(!bvecs[i].bv_page)) | |
4b6d287f | 967 | goto do_sync_io; |
2ca68f5e N |
968 | memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, |
969 | kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); | |
970 | kunmap(bvecs[i].bv_page); | |
4b6d287f N |
971 | kunmap(bvec->bv_page); |
972 | } | |
2ca68f5e | 973 | r1_bio->behind_bvecs = bvecs; |
af6d7b76 N |
974 | r1_bio->behind_page_count = bio->bi_vcnt; |
975 | set_bit(R1BIO_BehindIO, &r1_bio->state); | |
976 | return; | |
4b6d287f N |
977 | |
978 | do_sync_io: | |
af6d7b76 | 979 | for (i = 0; i < bio->bi_vcnt; i++) |
2ca68f5e N |
980 | if (bvecs[i].bv_page) |
981 | put_page(bvecs[i].bv_page); | |
982 | kfree(bvecs); | |
4f024f37 KO |
983 | pr_debug("%dB behind alloc failed, doing sync I/O\n", |
984 | bio->bi_iter.bi_size); | |
4b6d287f N |
985 | } |
986 | ||
f54a9d0e N |
987 | struct raid1_plug_cb { |
988 | struct blk_plug_cb cb; | |
989 | struct bio_list pending; | |
990 | int pending_cnt; | |
991 | }; | |
992 | ||
993 | static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
994 | { | |
995 | struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, | |
996 | cb); | |
997 | struct mddev *mddev = plug->cb.data; | |
998 | struct r1conf *conf = mddev->private; | |
999 | struct bio *bio; | |
1000 | ||
874807a8 | 1001 | if (from_schedule || current->bio_list) { |
f54a9d0e N |
1002 | spin_lock_irq(&conf->device_lock); |
1003 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1004 | conf->pending_count += plug->pending_cnt; | |
1005 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1006 | wake_up(&conf->wait_barrier); |
f54a9d0e N |
1007 | md_wakeup_thread(mddev->thread); |
1008 | kfree(plug); | |
1009 | return; | |
1010 | } | |
1011 | ||
1012 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1013 | bio = bio_list_get(&plug->pending); | |
1014 | bitmap_unplug(mddev->bitmap); | |
1015 | wake_up(&conf->wait_barrier); | |
1016 | ||
1017 | while (bio) { /* submit pending writes */ | |
1018 | struct bio *next = bio->bi_next; | |
1019 | bio->bi_next = NULL; | |
796a5cf0 | 1020 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
32f9f570 SL |
1021 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) |
1022 | /* Just ignore it */ | |
4246a0b6 | 1023 | bio_endio(bio); |
32f9f570 SL |
1024 | else |
1025 | generic_make_request(bio); | |
f54a9d0e N |
1026 | bio = next; |
1027 | } | |
1028 | kfree(plug); | |
1029 | } | |
1030 | ||
849674e4 | 1031 | static void raid1_make_request(struct mddev *mddev, struct bio * bio) |
1da177e4 | 1032 | { |
e8096360 | 1033 | struct r1conf *conf = mddev->private; |
0eaf822c | 1034 | struct raid1_info *mirror; |
9f2c9d12 | 1035 | struct r1bio *r1_bio; |
1da177e4 | 1036 | struct bio *read_bio; |
1f68f0c4 | 1037 | int i, disks; |
84255d10 | 1038 | struct bitmap *bitmap; |
191ea9b2 | 1039 | unsigned long flags; |
796a5cf0 | 1040 | const int op = bio_op(bio); |
a362357b | 1041 | const int rw = bio_data_dir(bio); |
1eff9d32 JA |
1042 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); |
1043 | const unsigned long do_flush_fua = (bio->bi_opf & | |
28a8f0d3 | 1044 | (REQ_PREFLUSH | REQ_FUA)); |
3cb03002 | 1045 | struct md_rdev *blocked_rdev; |
f54a9d0e N |
1046 | struct blk_plug_cb *cb; |
1047 | struct raid1_plug_cb *plug = NULL; | |
1f68f0c4 N |
1048 | int first_clone; |
1049 | int sectors_handled; | |
1050 | int max_sectors; | |
79ef3a8a | 1051 | sector_t start_next_window; |
191ea9b2 | 1052 | |
1da177e4 LT |
1053 | /* |
1054 | * Register the new request and wait if the reconstruction | |
1055 | * thread has put up a bar for new requests. | |
1056 | * Continue immediately if no resync is active currently. | |
1057 | */ | |
62de608d | 1058 | |
3d310eb7 N |
1059 | md_write_start(mddev, bio); /* wait on superblock update early */ |
1060 | ||
6eef4b21 | 1061 | if (bio_data_dir(bio) == WRITE && |
589a1c49 GR |
1062 | ((bio_end_sector(bio) > mddev->suspend_lo && |
1063 | bio->bi_iter.bi_sector < mddev->suspend_hi) || | |
1064 | (mddev_is_clustered(mddev) && | |
90382ed9 GR |
1065 | md_cluster_ops->area_resyncing(mddev, WRITE, |
1066 | bio->bi_iter.bi_sector, bio_end_sector(bio))))) { | |
6eef4b21 N |
1067 | /* As the suspend_* range is controlled by |
1068 | * userspace, we want an interruptible | |
1069 | * wait. | |
1070 | */ | |
1071 | DEFINE_WAIT(w); | |
1072 | for (;;) { | |
1073 | flush_signals(current); | |
1074 | prepare_to_wait(&conf->wait_barrier, | |
1075 | &w, TASK_INTERRUPTIBLE); | |
f73a1c7d | 1076 | if (bio_end_sector(bio) <= mddev->suspend_lo || |
589a1c49 GR |
1077 | bio->bi_iter.bi_sector >= mddev->suspend_hi || |
1078 | (mddev_is_clustered(mddev) && | |
90382ed9 | 1079 | !md_cluster_ops->area_resyncing(mddev, WRITE, |
589a1c49 | 1080 | bio->bi_iter.bi_sector, bio_end_sector(bio)))) |
6eef4b21 N |
1081 | break; |
1082 | schedule(); | |
1083 | } | |
1084 | finish_wait(&conf->wait_barrier, &w); | |
1085 | } | |
62de608d | 1086 | |
79ef3a8a | 1087 | start_next_window = wait_barrier(conf, bio); |
1da177e4 | 1088 | |
84255d10 N |
1089 | bitmap = mddev->bitmap; |
1090 | ||
1da177e4 | 1091 | /* |
70246286 | 1092 | * make_request() can abort the operation when read-ahead is being |
1da177e4 LT |
1093 | * used and no empty request is available. |
1094 | * | |
1095 | */ | |
1096 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1097 | ||
1098 | r1_bio->master_bio = bio; | |
aa8b57aa | 1099 | r1_bio->sectors = bio_sectors(bio); |
191ea9b2 | 1100 | r1_bio->state = 0; |
1da177e4 | 1101 | r1_bio->mddev = mddev; |
4f024f37 | 1102 | r1_bio->sector = bio->bi_iter.bi_sector; |
1da177e4 | 1103 | |
d2eb35ac N |
1104 | /* We might need to issue multiple reads to different |
1105 | * devices if there are bad blocks around, so we keep | |
1106 | * track of the number of reads in bio->bi_phys_segments. | |
1107 | * If this is 0, there is only one r1_bio and no locking | |
1108 | * will be needed when requests complete. If it is | |
1109 | * non-zero, then it is the number of not-completed requests. | |
1110 | */ | |
1111 | bio->bi_phys_segments = 0; | |
b7c44ed9 | 1112 | bio_clear_flag(bio, BIO_SEG_VALID); |
d2eb35ac | 1113 | |
a362357b | 1114 | if (rw == READ) { |
1da177e4 LT |
1115 | /* |
1116 | * read balancing logic: | |
1117 | */ | |
d2eb35ac N |
1118 | int rdisk; |
1119 | ||
1120 | read_again: | |
1121 | rdisk = read_balance(conf, r1_bio, &max_sectors); | |
1da177e4 LT |
1122 | |
1123 | if (rdisk < 0) { | |
1124 | /* couldn't find anywhere to read from */ | |
1125 | raid_end_bio_io(r1_bio); | |
5a7bbad2 | 1126 | return; |
1da177e4 LT |
1127 | } |
1128 | mirror = conf->mirrors + rdisk; | |
1129 | ||
e555190d N |
1130 | if (test_bit(WriteMostly, &mirror->rdev->flags) && |
1131 | bitmap) { | |
1132 | /* Reading from a write-mostly device must | |
1133 | * take care not to over-take any writes | |
1134 | * that are 'behind' | |
1135 | */ | |
1136 | wait_event(bitmap->behind_wait, | |
1137 | atomic_read(&bitmap->behind_writes) == 0); | |
1138 | } | |
1da177e4 | 1139 | r1_bio->read_disk = rdisk; |
f0cc9a05 | 1140 | r1_bio->start_next_window = 0; |
1da177e4 | 1141 | |
a167f663 | 1142 | read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
4f024f37 | 1143 | bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, |
6678d83f | 1144 | max_sectors); |
1da177e4 LT |
1145 | |
1146 | r1_bio->bios[rdisk] = read_bio; | |
1147 | ||
4f024f37 KO |
1148 | read_bio->bi_iter.bi_sector = r1_bio->sector + |
1149 | mirror->rdev->data_offset; | |
1da177e4 LT |
1150 | read_bio->bi_bdev = mirror->rdev->bdev; |
1151 | read_bio->bi_end_io = raid1_end_read_request; | |
796a5cf0 | 1152 | bio_set_op_attrs(read_bio, op, do_sync); |
1da177e4 LT |
1153 | read_bio->bi_private = r1_bio; |
1154 | ||
d2eb35ac N |
1155 | if (max_sectors < r1_bio->sectors) { |
1156 | /* could not read all from this device, so we will | |
1157 | * need another r1_bio. | |
1158 | */ | |
d2eb35ac N |
1159 | |
1160 | sectors_handled = (r1_bio->sector + max_sectors | |
4f024f37 | 1161 | - bio->bi_iter.bi_sector); |
d2eb35ac N |
1162 | r1_bio->sectors = max_sectors; |
1163 | spin_lock_irq(&conf->device_lock); | |
1164 | if (bio->bi_phys_segments == 0) | |
1165 | bio->bi_phys_segments = 2; | |
1166 | else | |
1167 | bio->bi_phys_segments++; | |
1168 | spin_unlock_irq(&conf->device_lock); | |
1169 | /* Cannot call generic_make_request directly | |
1170 | * as that will be queued in __make_request | |
1171 | * and subsequent mempool_alloc might block waiting | |
1172 | * for it. So hand bio over to raid1d. | |
1173 | */ | |
1174 | reschedule_retry(r1_bio); | |
1175 | ||
1176 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1177 | ||
1178 | r1_bio->master_bio = bio; | |
aa8b57aa | 1179 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
d2eb35ac N |
1180 | r1_bio->state = 0; |
1181 | r1_bio->mddev = mddev; | |
4f024f37 KO |
1182 | r1_bio->sector = bio->bi_iter.bi_sector + |
1183 | sectors_handled; | |
d2eb35ac N |
1184 | goto read_again; |
1185 | } else | |
1186 | generic_make_request(read_bio); | |
5a7bbad2 | 1187 | return; |
1da177e4 LT |
1188 | } |
1189 | ||
1190 | /* | |
1191 | * WRITE: | |
1192 | */ | |
34db0cd6 N |
1193 | if (conf->pending_count >= max_queued_requests) { |
1194 | md_wakeup_thread(mddev->thread); | |
1195 | wait_event(conf->wait_barrier, | |
1196 | conf->pending_count < max_queued_requests); | |
1197 | } | |
1f68f0c4 | 1198 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1199 | * inc refcount on their rdev. Record them by setting |
1200 | * bios[x] to bio | |
1f68f0c4 N |
1201 | * If there are known/acknowledged bad blocks on any device on |
1202 | * which we have seen a write error, we want to avoid writing those | |
1203 | * blocks. | |
1204 | * This potentially requires several writes to write around | |
1205 | * the bad blocks. Each set of writes gets it's own r1bio | |
1206 | * with a set of bios attached. | |
1da177e4 | 1207 | */ |
c3b328ac | 1208 | |
8f19ccb2 | 1209 | disks = conf->raid_disks * 2; |
6bfe0b49 | 1210 | retry_write: |
79ef3a8a | 1211 | r1_bio->start_next_window = start_next_window; |
6bfe0b49 | 1212 | blocked_rdev = NULL; |
1da177e4 | 1213 | rcu_read_lock(); |
1f68f0c4 | 1214 | max_sectors = r1_bio->sectors; |
1da177e4 | 1215 | for (i = 0; i < disks; i++) { |
3cb03002 | 1216 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
6bfe0b49 DW |
1217 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1218 | atomic_inc(&rdev->nr_pending); | |
1219 | blocked_rdev = rdev; | |
1220 | break; | |
1221 | } | |
1f68f0c4 | 1222 | r1_bio->bios[i] = NULL; |
8ae12666 | 1223 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
8f19ccb2 N |
1224 | if (i < conf->raid_disks) |
1225 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
1f68f0c4 N |
1226 | continue; |
1227 | } | |
1228 | ||
1229 | atomic_inc(&rdev->nr_pending); | |
1230 | if (test_bit(WriteErrorSeen, &rdev->flags)) { | |
1231 | sector_t first_bad; | |
1232 | int bad_sectors; | |
1233 | int is_bad; | |
1234 | ||
1235 | is_bad = is_badblock(rdev, r1_bio->sector, | |
1236 | max_sectors, | |
1237 | &first_bad, &bad_sectors); | |
1238 | if (is_bad < 0) { | |
1239 | /* mustn't write here until the bad block is | |
1240 | * acknowledged*/ | |
1241 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1242 | blocked_rdev = rdev; | |
1243 | break; | |
1244 | } | |
1245 | if (is_bad && first_bad <= r1_bio->sector) { | |
1246 | /* Cannot write here at all */ | |
1247 | bad_sectors -= (r1_bio->sector - first_bad); | |
1248 | if (bad_sectors < max_sectors) | |
1249 | /* mustn't write more than bad_sectors | |
1250 | * to other devices yet | |
1251 | */ | |
1252 | max_sectors = bad_sectors; | |
03c902e1 | 1253 | rdev_dec_pending(rdev, mddev); |
1f68f0c4 N |
1254 | /* We don't set R1BIO_Degraded as that |
1255 | * only applies if the disk is | |
1256 | * missing, so it might be re-added, | |
1257 | * and we want to know to recover this | |
1258 | * chunk. | |
1259 | * In this case the device is here, | |
1260 | * and the fact that this chunk is not | |
1261 | * in-sync is recorded in the bad | |
1262 | * block log | |
1263 | */ | |
1264 | continue; | |
964147d5 | 1265 | } |
1f68f0c4 N |
1266 | if (is_bad) { |
1267 | int good_sectors = first_bad - r1_bio->sector; | |
1268 | if (good_sectors < max_sectors) | |
1269 | max_sectors = good_sectors; | |
1270 | } | |
1271 | } | |
1272 | r1_bio->bios[i] = bio; | |
1da177e4 LT |
1273 | } |
1274 | rcu_read_unlock(); | |
1275 | ||
6bfe0b49 DW |
1276 | if (unlikely(blocked_rdev)) { |
1277 | /* Wait for this device to become unblocked */ | |
1278 | int j; | |
79ef3a8a | 1279 | sector_t old = start_next_window; |
6bfe0b49 DW |
1280 | |
1281 | for (j = 0; j < i; j++) | |
1282 | if (r1_bio->bios[j]) | |
1283 | rdev_dec_pending(conf->mirrors[j].rdev, mddev); | |
1f68f0c4 | 1284 | r1_bio->state = 0; |
4f024f37 | 1285 | allow_barrier(conf, start_next_window, bio->bi_iter.bi_sector); |
6bfe0b49 | 1286 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
79ef3a8a | 1287 | start_next_window = wait_barrier(conf, bio); |
1288 | /* | |
1289 | * We must make sure the multi r1bios of bio have | |
1290 | * the same value of bi_phys_segments | |
1291 | */ | |
1292 | if (bio->bi_phys_segments && old && | |
1293 | old != start_next_window) | |
1294 | /* Wait for the former r1bio(s) to complete */ | |
1295 | wait_event(conf->wait_barrier, | |
1296 | bio->bi_phys_segments == 1); | |
6bfe0b49 DW |
1297 | goto retry_write; |
1298 | } | |
1299 | ||
1f68f0c4 N |
1300 | if (max_sectors < r1_bio->sectors) { |
1301 | /* We are splitting this write into multiple parts, so | |
1302 | * we need to prepare for allocating another r1_bio. | |
1303 | */ | |
1304 | r1_bio->sectors = max_sectors; | |
1305 | spin_lock_irq(&conf->device_lock); | |
1306 | if (bio->bi_phys_segments == 0) | |
1307 | bio->bi_phys_segments = 2; | |
1308 | else | |
1309 | bio->bi_phys_segments++; | |
1310 | spin_unlock_irq(&conf->device_lock); | |
191ea9b2 | 1311 | } |
4f024f37 | 1312 | sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; |
4b6d287f | 1313 | |
4e78064f | 1314 | atomic_set(&r1_bio->remaining, 1); |
4b6d287f | 1315 | atomic_set(&r1_bio->behind_remaining, 0); |
06d91a5f | 1316 | |
1f68f0c4 | 1317 | first_clone = 1; |
1da177e4 LT |
1318 | for (i = 0; i < disks; i++) { |
1319 | struct bio *mbio; | |
1320 | if (!r1_bio->bios[i]) | |
1321 | continue; | |
1322 | ||
a167f663 | 1323 | mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); |
4f024f37 | 1324 | bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector, max_sectors); |
1f68f0c4 N |
1325 | |
1326 | if (first_clone) { | |
1327 | /* do behind I/O ? | |
1328 | * Not if there are too many, or cannot | |
1329 | * allocate memory, or a reader on WriteMostly | |
1330 | * is waiting for behind writes to flush */ | |
1331 | if (bitmap && | |
1332 | (atomic_read(&bitmap->behind_writes) | |
1333 | < mddev->bitmap_info.max_write_behind) && | |
1334 | !waitqueue_active(&bitmap->behind_wait)) | |
1335 | alloc_behind_pages(mbio, r1_bio); | |
1336 | ||
1337 | bitmap_startwrite(bitmap, r1_bio->sector, | |
1338 | r1_bio->sectors, | |
1339 | test_bit(R1BIO_BehindIO, | |
1340 | &r1_bio->state)); | |
1341 | first_clone = 0; | |
1342 | } | |
2ca68f5e | 1343 | if (r1_bio->behind_bvecs) { |
4b6d287f N |
1344 | struct bio_vec *bvec; |
1345 | int j; | |
1346 | ||
cb34e057 KO |
1347 | /* |
1348 | * We trimmed the bio, so _all is legit | |
4b6d287f | 1349 | */ |
d74c6d51 | 1350 | bio_for_each_segment_all(bvec, mbio, j) |
2ca68f5e | 1351 | bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; |
4b6d287f N |
1352 | if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) |
1353 | atomic_inc(&r1_bio->behind_remaining); | |
1354 | } | |
1355 | ||
1f68f0c4 N |
1356 | r1_bio->bios[i] = mbio; |
1357 | ||
4f024f37 | 1358 | mbio->bi_iter.bi_sector = (r1_bio->sector + |
1f68f0c4 N |
1359 | conf->mirrors[i].rdev->data_offset); |
1360 | mbio->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1361 | mbio->bi_end_io = raid1_end_write_request; | |
288dab8a | 1362 | bio_set_op_attrs(mbio, op, do_flush_fua | do_sync); |
1f68f0c4 N |
1363 | mbio->bi_private = r1_bio; |
1364 | ||
1da177e4 | 1365 | atomic_inc(&r1_bio->remaining); |
f54a9d0e N |
1366 | |
1367 | cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); | |
1368 | if (cb) | |
1369 | plug = container_of(cb, struct raid1_plug_cb, cb); | |
1370 | else | |
1371 | plug = NULL; | |
4e78064f | 1372 | spin_lock_irqsave(&conf->device_lock, flags); |
f54a9d0e N |
1373 | if (plug) { |
1374 | bio_list_add(&plug->pending, mbio); | |
1375 | plug->pending_cnt++; | |
1376 | } else { | |
1377 | bio_list_add(&conf->pending_bio_list, mbio); | |
1378 | conf->pending_count++; | |
1379 | } | |
4e78064f | 1380 | spin_unlock_irqrestore(&conf->device_lock, flags); |
f54a9d0e | 1381 | if (!plug) |
b357f04a | 1382 | md_wakeup_thread(mddev->thread); |
1da177e4 | 1383 | } |
079fa166 N |
1384 | /* Mustn't call r1_bio_write_done before this next test, |
1385 | * as it could result in the bio being freed. | |
1386 | */ | |
aa8b57aa | 1387 | if (sectors_handled < bio_sectors(bio)) { |
079fa166 | 1388 | r1_bio_write_done(r1_bio); |
1f68f0c4 N |
1389 | /* We need another r1_bio. It has already been counted |
1390 | * in bio->bi_phys_segments | |
1391 | */ | |
1392 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
1393 | r1_bio->master_bio = bio; | |
aa8b57aa | 1394 | r1_bio->sectors = bio_sectors(bio) - sectors_handled; |
1f68f0c4 N |
1395 | r1_bio->state = 0; |
1396 | r1_bio->mddev = mddev; | |
4f024f37 | 1397 | r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; |
1f68f0c4 N |
1398 | goto retry_write; |
1399 | } | |
1400 | ||
079fa166 N |
1401 | r1_bio_write_done(r1_bio); |
1402 | ||
1403 | /* In case raid1d snuck in to freeze_array */ | |
1404 | wake_up(&conf->wait_barrier); | |
1da177e4 LT |
1405 | } |
1406 | ||
849674e4 | 1407 | static void raid1_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1408 | { |
e8096360 | 1409 | struct r1conf *conf = mddev->private; |
1da177e4 LT |
1410 | int i; |
1411 | ||
1412 | seq_printf(seq, " [%d/%d] [", conf->raid_disks, | |
11ce99e6 | 1413 | conf->raid_disks - mddev->degraded); |
ddac7c7e N |
1414 | rcu_read_lock(); |
1415 | for (i = 0; i < conf->raid_disks; i++) { | |
3cb03002 | 1416 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
1da177e4 | 1417 | seq_printf(seq, "%s", |
ddac7c7e N |
1418 | rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); |
1419 | } | |
1420 | rcu_read_unlock(); | |
1da177e4 LT |
1421 | seq_printf(seq, "]"); |
1422 | } | |
1423 | ||
849674e4 | 1424 | static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1425 | { |
1426 | char b[BDEVNAME_SIZE]; | |
e8096360 | 1427 | struct r1conf *conf = mddev->private; |
423f04d6 | 1428 | unsigned long flags; |
1da177e4 LT |
1429 | |
1430 | /* | |
1431 | * If it is not operational, then we have already marked it as dead | |
1432 | * else if it is the last working disks, ignore the error, let the | |
1433 | * next level up know. | |
1434 | * else mark the drive as failed | |
1435 | */ | |
b2d444d7 | 1436 | if (test_bit(In_sync, &rdev->flags) |
4044ba58 | 1437 | && (conf->raid_disks - mddev->degraded) == 1) { |
1da177e4 LT |
1438 | /* |
1439 | * Don't fail the drive, act as though we were just a | |
4044ba58 N |
1440 | * normal single drive. |
1441 | * However don't try a recovery from this drive as | |
1442 | * it is very likely to fail. | |
1da177e4 | 1443 | */ |
5389042f | 1444 | conf->recovery_disabled = mddev->recovery_disabled; |
1da177e4 | 1445 | return; |
4044ba58 | 1446 | } |
de393cde | 1447 | set_bit(Blocked, &rdev->flags); |
423f04d6 | 1448 | spin_lock_irqsave(&conf->device_lock, flags); |
c04be0aa | 1449 | if (test_and_clear_bit(In_sync, &rdev->flags)) { |
1da177e4 | 1450 | mddev->degraded++; |
dd00a99e | 1451 | set_bit(Faulty, &rdev->flags); |
dd00a99e N |
1452 | } else |
1453 | set_bit(Faulty, &rdev->flags); | |
423f04d6 | 1454 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2446dba0 N |
1455 | /* |
1456 | * if recovery is running, make sure it aborts. | |
1457 | */ | |
1458 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
85ad1d13 GJ |
1459 | set_mask_bits(&mddev->flags, 0, |
1460 | BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_PENDING)); | |
1d41c216 N |
1461 | pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" |
1462 | "md/raid1:%s: Operation continuing on %d devices.\n", | |
1463 | mdname(mddev), bdevname(rdev->bdev, b), | |
1464 | mdname(mddev), conf->raid_disks - mddev->degraded); | |
1da177e4 LT |
1465 | } |
1466 | ||
e8096360 | 1467 | static void print_conf(struct r1conf *conf) |
1da177e4 LT |
1468 | { |
1469 | int i; | |
1da177e4 | 1470 | |
1d41c216 | 1471 | pr_debug("RAID1 conf printout:\n"); |
1da177e4 | 1472 | if (!conf) { |
1d41c216 | 1473 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1474 | return; |
1475 | } | |
1d41c216 N |
1476 | pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, |
1477 | conf->raid_disks); | |
1da177e4 | 1478 | |
ddac7c7e | 1479 | rcu_read_lock(); |
1da177e4 LT |
1480 | for (i = 0; i < conf->raid_disks; i++) { |
1481 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 1482 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
ddac7c7e | 1483 | if (rdev) |
1d41c216 N |
1484 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1485 | i, !test_bit(In_sync, &rdev->flags), | |
1486 | !test_bit(Faulty, &rdev->flags), | |
1487 | bdevname(rdev->bdev,b)); | |
1da177e4 | 1488 | } |
ddac7c7e | 1489 | rcu_read_unlock(); |
1da177e4 LT |
1490 | } |
1491 | ||
e8096360 | 1492 | static void close_sync(struct r1conf *conf) |
1da177e4 | 1493 | { |
79ef3a8a | 1494 | wait_barrier(conf, NULL); |
1495 | allow_barrier(conf, 0, 0); | |
1da177e4 LT |
1496 | |
1497 | mempool_destroy(conf->r1buf_pool); | |
1498 | conf->r1buf_pool = NULL; | |
79ef3a8a | 1499 | |
669cc7ba | 1500 | spin_lock_irq(&conf->resync_lock); |
e8ff8bf0 | 1501 | conf->next_resync = MaxSector - 2 * NEXT_NORMALIO_DISTANCE; |
79ef3a8a | 1502 | conf->start_next_window = MaxSector; |
669cc7ba N |
1503 | conf->current_window_requests += |
1504 | conf->next_window_requests; | |
1505 | conf->next_window_requests = 0; | |
1506 | spin_unlock_irq(&conf->resync_lock); | |
1da177e4 LT |
1507 | } |
1508 | ||
fd01b88c | 1509 | static int raid1_spare_active(struct mddev *mddev) |
1da177e4 LT |
1510 | { |
1511 | int i; | |
e8096360 | 1512 | struct r1conf *conf = mddev->private; |
6b965620 N |
1513 | int count = 0; |
1514 | unsigned long flags; | |
1da177e4 LT |
1515 | |
1516 | /* | |
f72ffdd6 | 1517 | * Find all failed disks within the RAID1 configuration |
ddac7c7e N |
1518 | * and mark them readable. |
1519 | * Called under mddev lock, so rcu protection not needed. | |
423f04d6 N |
1520 | * device_lock used to avoid races with raid1_end_read_request |
1521 | * which expects 'In_sync' flags and ->degraded to be consistent. | |
1da177e4 | 1522 | */ |
423f04d6 | 1523 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 1524 | for (i = 0; i < conf->raid_disks; i++) { |
3cb03002 | 1525 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
8c7a2c2b N |
1526 | struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; |
1527 | if (repl | |
1aee41f6 | 1528 | && !test_bit(Candidate, &repl->flags) |
8c7a2c2b N |
1529 | && repl->recovery_offset == MaxSector |
1530 | && !test_bit(Faulty, &repl->flags) | |
1531 | && !test_and_set_bit(In_sync, &repl->flags)) { | |
1532 | /* replacement has just become active */ | |
1533 | if (!rdev || | |
1534 | !test_and_clear_bit(In_sync, &rdev->flags)) | |
1535 | count++; | |
1536 | if (rdev) { | |
1537 | /* Replaced device not technically | |
1538 | * faulty, but we need to be sure | |
1539 | * it gets removed and never re-added | |
1540 | */ | |
1541 | set_bit(Faulty, &rdev->flags); | |
1542 | sysfs_notify_dirent_safe( | |
1543 | rdev->sysfs_state); | |
1544 | } | |
1545 | } | |
ddac7c7e | 1546 | if (rdev |
61e4947c | 1547 | && rdev->recovery_offset == MaxSector |
ddac7c7e | 1548 | && !test_bit(Faulty, &rdev->flags) |
c04be0aa | 1549 | && !test_and_set_bit(In_sync, &rdev->flags)) { |
6b965620 | 1550 | count++; |
654e8b5a | 1551 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
1552 | } |
1553 | } | |
6b965620 N |
1554 | mddev->degraded -= count; |
1555 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1556 | |
1557 | print_conf(conf); | |
6b965620 | 1558 | return count; |
1da177e4 LT |
1559 | } |
1560 | ||
fd01b88c | 1561 | static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1562 | { |
e8096360 | 1563 | struct r1conf *conf = mddev->private; |
199050ea | 1564 | int err = -EEXIST; |
41158c7e | 1565 | int mirror = 0; |
0eaf822c | 1566 | struct raid1_info *p; |
6c2fce2e | 1567 | int first = 0; |
30194636 | 1568 | int last = conf->raid_disks - 1; |
1da177e4 | 1569 | |
5389042f N |
1570 | if (mddev->recovery_disabled == conf->recovery_disabled) |
1571 | return -EBUSY; | |
1572 | ||
1501efad DW |
1573 | if (md_integrity_add_rdev(rdev, mddev)) |
1574 | return -ENXIO; | |
1575 | ||
6c2fce2e NB |
1576 | if (rdev->raid_disk >= 0) |
1577 | first = last = rdev->raid_disk; | |
1578 | ||
70bcecdb GR |
1579 | /* |
1580 | * find the disk ... but prefer rdev->saved_raid_disk | |
1581 | * if possible. | |
1582 | */ | |
1583 | if (rdev->saved_raid_disk >= 0 && | |
1584 | rdev->saved_raid_disk >= first && | |
1585 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) | |
1586 | first = last = rdev->saved_raid_disk; | |
1587 | ||
7ef449d1 N |
1588 | for (mirror = first; mirror <= last; mirror++) { |
1589 | p = conf->mirrors+mirror; | |
1590 | if (!p->rdev) { | |
1da177e4 | 1591 | |
9092c02d JB |
1592 | if (mddev->gendisk) |
1593 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1594 | rdev->data_offset << 9); | |
1da177e4 LT |
1595 | |
1596 | p->head_position = 0; | |
1597 | rdev->raid_disk = mirror; | |
199050ea | 1598 | err = 0; |
6aea114a N |
1599 | /* As all devices are equivalent, we don't need a full recovery |
1600 | * if this was recently any drive of the array | |
1601 | */ | |
1602 | if (rdev->saved_raid_disk < 0) | |
41158c7e | 1603 | conf->fullsync = 1; |
d6065f7b | 1604 | rcu_assign_pointer(p->rdev, rdev); |
1da177e4 LT |
1605 | break; |
1606 | } | |
7ef449d1 N |
1607 | if (test_bit(WantReplacement, &p->rdev->flags) && |
1608 | p[conf->raid_disks].rdev == NULL) { | |
1609 | /* Add this device as a replacement */ | |
1610 | clear_bit(In_sync, &rdev->flags); | |
1611 | set_bit(Replacement, &rdev->flags); | |
1612 | rdev->raid_disk = mirror; | |
1613 | err = 0; | |
1614 | conf->fullsync = 1; | |
1615 | rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); | |
1616 | break; | |
1617 | } | |
1618 | } | |
9092c02d | 1619 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2ff8cc2c | 1620 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1da177e4 | 1621 | print_conf(conf); |
199050ea | 1622 | return err; |
1da177e4 LT |
1623 | } |
1624 | ||
b8321b68 | 1625 | static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1626 | { |
e8096360 | 1627 | struct r1conf *conf = mddev->private; |
1da177e4 | 1628 | int err = 0; |
b8321b68 | 1629 | int number = rdev->raid_disk; |
0eaf822c | 1630 | struct raid1_info *p = conf->mirrors + number; |
1da177e4 | 1631 | |
b014f14c N |
1632 | if (rdev != p->rdev) |
1633 | p = conf->mirrors + conf->raid_disks + number; | |
1634 | ||
1da177e4 | 1635 | print_conf(conf); |
b8321b68 | 1636 | if (rdev == p->rdev) { |
b2d444d7 | 1637 | if (test_bit(In_sync, &rdev->flags) || |
1da177e4 LT |
1638 | atomic_read(&rdev->nr_pending)) { |
1639 | err = -EBUSY; | |
1640 | goto abort; | |
1641 | } | |
046abeed | 1642 | /* Only remove non-faulty devices if recovery |
dfc70645 N |
1643 | * is not possible. |
1644 | */ | |
1645 | if (!test_bit(Faulty, &rdev->flags) && | |
5389042f | 1646 | mddev->recovery_disabled != conf->recovery_disabled && |
dfc70645 N |
1647 | mddev->degraded < conf->raid_disks) { |
1648 | err = -EBUSY; | |
1649 | goto abort; | |
1650 | } | |
1da177e4 | 1651 | p->rdev = NULL; |
d787be40 N |
1652 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1653 | synchronize_rcu(); | |
1654 | if (atomic_read(&rdev->nr_pending)) { | |
1655 | /* lost the race, try later */ | |
1656 | err = -EBUSY; | |
1657 | p->rdev = rdev; | |
1658 | goto abort; | |
1659 | } | |
1660 | } | |
1661 | if (conf->mirrors[conf->raid_disks + number].rdev) { | |
8c7a2c2b N |
1662 | /* We just removed a device that is being replaced. |
1663 | * Move down the replacement. We drain all IO before | |
1664 | * doing this to avoid confusion. | |
1665 | */ | |
1666 | struct md_rdev *repl = | |
1667 | conf->mirrors[conf->raid_disks + number].rdev; | |
e2d59925 | 1668 | freeze_array(conf, 0); |
8c7a2c2b N |
1669 | clear_bit(Replacement, &repl->flags); |
1670 | p->rdev = repl; | |
1671 | conf->mirrors[conf->raid_disks + number].rdev = NULL; | |
e2d59925 | 1672 | unfreeze_array(conf); |
8c7a2c2b N |
1673 | clear_bit(WantReplacement, &rdev->flags); |
1674 | } else | |
b014f14c | 1675 | clear_bit(WantReplacement, &rdev->flags); |
a91a2785 | 1676 | err = md_integrity_register(mddev); |
1da177e4 LT |
1677 | } |
1678 | abort: | |
1679 | ||
1680 | print_conf(conf); | |
1681 | return err; | |
1682 | } | |
1683 | ||
4246a0b6 | 1684 | static void end_sync_read(struct bio *bio) |
1da177e4 | 1685 | { |
9f2c9d12 | 1686 | struct r1bio *r1_bio = bio->bi_private; |
1da177e4 | 1687 | |
0fc280f6 | 1688 | update_head_pos(r1_bio->read_disk, r1_bio); |
ba3ae3be | 1689 | |
1da177e4 LT |
1690 | /* |
1691 | * we have read a block, now it needs to be re-written, | |
1692 | * or re-read if the read failed. | |
1693 | * We don't do much here, just schedule handling by raid1d | |
1694 | */ | |
4246a0b6 | 1695 | if (!bio->bi_error) |
1da177e4 | 1696 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
d11c171e N |
1697 | |
1698 | if (atomic_dec_and_test(&r1_bio->remaining)) | |
1699 | reschedule_retry(r1_bio); | |
1da177e4 LT |
1700 | } |
1701 | ||
4246a0b6 | 1702 | static void end_sync_write(struct bio *bio) |
1da177e4 | 1703 | { |
4246a0b6 | 1704 | int uptodate = !bio->bi_error; |
9f2c9d12 | 1705 | struct r1bio *r1_bio = bio->bi_private; |
fd01b88c | 1706 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1707 | struct r1conf *conf = mddev->private; |
4367af55 N |
1708 | sector_t first_bad; |
1709 | int bad_sectors; | |
854abd75 | 1710 | struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; |
ba3ae3be | 1711 | |
6b1117d5 | 1712 | if (!uptodate) { |
57dab0bd | 1713 | sector_t sync_blocks = 0; |
6b1117d5 N |
1714 | sector_t s = r1_bio->sector; |
1715 | long sectors_to_go = r1_bio->sectors; | |
1716 | /* make sure these bits doesn't get cleared. */ | |
1717 | do { | |
5e3db645 | 1718 | bitmap_end_sync(mddev->bitmap, s, |
6b1117d5 N |
1719 | &sync_blocks, 1); |
1720 | s += sync_blocks; | |
1721 | sectors_to_go -= sync_blocks; | |
1722 | } while (sectors_to_go > 0); | |
854abd75 N |
1723 | set_bit(WriteErrorSeen, &rdev->flags); |
1724 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) | |
19d67169 N |
1725 | set_bit(MD_RECOVERY_NEEDED, & |
1726 | mddev->recovery); | |
d8f05d29 | 1727 | set_bit(R1BIO_WriteError, &r1_bio->state); |
854abd75 | 1728 | } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, |
3a9f28a5 N |
1729 | &first_bad, &bad_sectors) && |
1730 | !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, | |
1731 | r1_bio->sector, | |
1732 | r1_bio->sectors, | |
1733 | &first_bad, &bad_sectors) | |
1734 | ) | |
4367af55 | 1735 | set_bit(R1BIO_MadeGood, &r1_bio->state); |
e3b9703e | 1736 | |
1da177e4 | 1737 | if (atomic_dec_and_test(&r1_bio->remaining)) { |
4367af55 | 1738 | int s = r1_bio->sectors; |
d8f05d29 N |
1739 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
1740 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
4367af55 N |
1741 | reschedule_retry(r1_bio); |
1742 | else { | |
1743 | put_buf(r1_bio); | |
1744 | md_done_sync(mddev, s, uptodate); | |
1745 | } | |
1da177e4 | 1746 | } |
1da177e4 LT |
1747 | } |
1748 | ||
3cb03002 | 1749 | static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, |
d8f05d29 N |
1750 | int sectors, struct page *page, int rw) |
1751 | { | |
796a5cf0 | 1752 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
d8f05d29 N |
1753 | /* success */ |
1754 | return 1; | |
19d67169 | 1755 | if (rw == WRITE) { |
d8f05d29 | 1756 | set_bit(WriteErrorSeen, &rdev->flags); |
19d67169 N |
1757 | if (!test_and_set_bit(WantReplacement, |
1758 | &rdev->flags)) | |
1759 | set_bit(MD_RECOVERY_NEEDED, & | |
1760 | rdev->mddev->recovery); | |
1761 | } | |
d8f05d29 N |
1762 | /* need to record an error - either for the block or the device */ |
1763 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
1764 | md_error(rdev->mddev, rdev); | |
1765 | return 0; | |
1766 | } | |
1767 | ||
9f2c9d12 | 1768 | static int fix_sync_read_error(struct r1bio *r1_bio) |
1da177e4 | 1769 | { |
a68e5870 N |
1770 | /* Try some synchronous reads of other devices to get |
1771 | * good data, much like with normal read errors. Only | |
1772 | * read into the pages we already have so we don't | |
1773 | * need to re-issue the read request. | |
1774 | * We don't need to freeze the array, because being in an | |
1775 | * active sync request, there is no normal IO, and | |
1776 | * no overlapping syncs. | |
06f60385 N |
1777 | * We don't need to check is_badblock() again as we |
1778 | * made sure that anything with a bad block in range | |
1779 | * will have bi_end_io clear. | |
a68e5870 | 1780 | */ |
fd01b88c | 1781 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1782 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1783 | struct bio *bio = r1_bio->bios[r1_bio->read_disk]; |
1784 | sector_t sect = r1_bio->sector; | |
1785 | int sectors = r1_bio->sectors; | |
1786 | int idx = 0; | |
1787 | ||
1788 | while(sectors) { | |
1789 | int s = sectors; | |
1790 | int d = r1_bio->read_disk; | |
1791 | int success = 0; | |
3cb03002 | 1792 | struct md_rdev *rdev; |
78d7f5f7 | 1793 | int start; |
a68e5870 N |
1794 | |
1795 | if (s > (PAGE_SIZE>>9)) | |
1796 | s = PAGE_SIZE >> 9; | |
1797 | do { | |
1798 | if (r1_bio->bios[d]->bi_end_io == end_sync_read) { | |
1799 | /* No rcu protection needed here devices | |
1800 | * can only be removed when no resync is | |
1801 | * active, and resync is currently active | |
1802 | */ | |
1803 | rdev = conf->mirrors[d].rdev; | |
9d3d8011 | 1804 | if (sync_page_io(rdev, sect, s<<9, |
a68e5870 | 1805 | bio->bi_io_vec[idx].bv_page, |
796a5cf0 | 1806 | REQ_OP_READ, 0, false)) { |
a68e5870 N |
1807 | success = 1; |
1808 | break; | |
1809 | } | |
1810 | } | |
1811 | d++; | |
8f19ccb2 | 1812 | if (d == conf->raid_disks * 2) |
a68e5870 N |
1813 | d = 0; |
1814 | } while (!success && d != r1_bio->read_disk); | |
1815 | ||
78d7f5f7 | 1816 | if (!success) { |
a68e5870 | 1817 | char b[BDEVNAME_SIZE]; |
3a9f28a5 N |
1818 | int abort = 0; |
1819 | /* Cannot read from anywhere, this block is lost. | |
1820 | * Record a bad block on each device. If that doesn't | |
1821 | * work just disable and interrupt the recovery. | |
1822 | * Don't fail devices as that won't really help. | |
1823 | */ | |
1d41c216 N |
1824 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
1825 | mdname(mddev), | |
1826 | bdevname(bio->bi_bdev, b), | |
1827 | (unsigned long long)r1_bio->sector); | |
8f19ccb2 | 1828 | for (d = 0; d < conf->raid_disks * 2; d++) { |
3a9f28a5 N |
1829 | rdev = conf->mirrors[d].rdev; |
1830 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
1831 | continue; | |
1832 | if (!rdev_set_badblocks(rdev, sect, s, 0)) | |
1833 | abort = 1; | |
1834 | } | |
1835 | if (abort) { | |
d890fa2b N |
1836 | conf->recovery_disabled = |
1837 | mddev->recovery_disabled; | |
3a9f28a5 N |
1838 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1839 | md_done_sync(mddev, r1_bio->sectors, 0); | |
1840 | put_buf(r1_bio); | |
1841 | return 0; | |
1842 | } | |
1843 | /* Try next page */ | |
1844 | sectors -= s; | |
1845 | sect += s; | |
1846 | idx++; | |
1847 | continue; | |
d11c171e | 1848 | } |
78d7f5f7 N |
1849 | |
1850 | start = d; | |
1851 | /* write it back and re-read */ | |
1852 | while (d != r1_bio->read_disk) { | |
1853 | if (d == 0) | |
8f19ccb2 | 1854 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1855 | d--; |
1856 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1857 | continue; | |
1858 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1859 | if (r1_sync_page_io(rdev, sect, s, |
1860 | bio->bi_io_vec[idx].bv_page, | |
1861 | WRITE) == 0) { | |
78d7f5f7 N |
1862 | r1_bio->bios[d]->bi_end_io = NULL; |
1863 | rdev_dec_pending(rdev, mddev); | |
9d3d8011 | 1864 | } |
78d7f5f7 N |
1865 | } |
1866 | d = start; | |
1867 | while (d != r1_bio->read_disk) { | |
1868 | if (d == 0) | |
8f19ccb2 | 1869 | d = conf->raid_disks * 2; |
78d7f5f7 N |
1870 | d--; |
1871 | if (r1_bio->bios[d]->bi_end_io != end_sync_read) | |
1872 | continue; | |
1873 | rdev = conf->mirrors[d].rdev; | |
d8f05d29 N |
1874 | if (r1_sync_page_io(rdev, sect, s, |
1875 | bio->bi_io_vec[idx].bv_page, | |
1876 | READ) != 0) | |
9d3d8011 | 1877 | atomic_add(s, &rdev->corrected_errors); |
78d7f5f7 | 1878 | } |
a68e5870 N |
1879 | sectors -= s; |
1880 | sect += s; | |
1881 | idx ++; | |
1882 | } | |
78d7f5f7 | 1883 | set_bit(R1BIO_Uptodate, &r1_bio->state); |
4246a0b6 | 1884 | bio->bi_error = 0; |
a68e5870 N |
1885 | return 1; |
1886 | } | |
1887 | ||
c95e6385 | 1888 | static void process_checks(struct r1bio *r1_bio) |
a68e5870 N |
1889 | { |
1890 | /* We have read all readable devices. If we haven't | |
1891 | * got the block, then there is no hope left. | |
1892 | * If we have, then we want to do a comparison | |
1893 | * and skip the write if everything is the same. | |
1894 | * If any blocks failed to read, then we need to | |
1895 | * attempt an over-write | |
1896 | */ | |
fd01b88c | 1897 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 1898 | struct r1conf *conf = mddev->private; |
a68e5870 N |
1899 | int primary; |
1900 | int i; | |
f4380a91 | 1901 | int vcnt; |
a68e5870 | 1902 | |
30bc9b53 N |
1903 | /* Fix variable parts of all bios */ |
1904 | vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); | |
1905 | for (i = 0; i < conf->raid_disks * 2; i++) { | |
1906 | int j; | |
1907 | int size; | |
4246a0b6 | 1908 | int error; |
30bc9b53 N |
1909 | struct bio *b = r1_bio->bios[i]; |
1910 | if (b->bi_end_io != end_sync_read) | |
1911 | continue; | |
4246a0b6 CH |
1912 | /* fixup the bio for reuse, but preserve errno */ |
1913 | error = b->bi_error; | |
30bc9b53 | 1914 | bio_reset(b); |
4246a0b6 | 1915 | b->bi_error = error; |
30bc9b53 | 1916 | b->bi_vcnt = vcnt; |
4f024f37 KO |
1917 | b->bi_iter.bi_size = r1_bio->sectors << 9; |
1918 | b->bi_iter.bi_sector = r1_bio->sector + | |
30bc9b53 N |
1919 | conf->mirrors[i].rdev->data_offset; |
1920 | b->bi_bdev = conf->mirrors[i].rdev->bdev; | |
1921 | b->bi_end_io = end_sync_read; | |
1922 | b->bi_private = r1_bio; | |
1923 | ||
4f024f37 | 1924 | size = b->bi_iter.bi_size; |
30bc9b53 N |
1925 | for (j = 0; j < vcnt ; j++) { |
1926 | struct bio_vec *bi; | |
1927 | bi = &b->bi_io_vec[j]; | |
1928 | bi->bv_offset = 0; | |
1929 | if (size > PAGE_SIZE) | |
1930 | bi->bv_len = PAGE_SIZE; | |
1931 | else | |
1932 | bi->bv_len = size; | |
1933 | size -= PAGE_SIZE; | |
1934 | } | |
1935 | } | |
8f19ccb2 | 1936 | for (primary = 0; primary < conf->raid_disks * 2; primary++) |
a68e5870 | 1937 | if (r1_bio->bios[primary]->bi_end_io == end_sync_read && |
4246a0b6 | 1938 | !r1_bio->bios[primary]->bi_error) { |
a68e5870 N |
1939 | r1_bio->bios[primary]->bi_end_io = NULL; |
1940 | rdev_dec_pending(conf->mirrors[primary].rdev, mddev); | |
1941 | break; | |
1942 | } | |
1943 | r1_bio->read_disk = primary; | |
8f19ccb2 | 1944 | for (i = 0; i < conf->raid_disks * 2; i++) { |
78d7f5f7 | 1945 | int j; |
78d7f5f7 N |
1946 | struct bio *pbio = r1_bio->bios[primary]; |
1947 | struct bio *sbio = r1_bio->bios[i]; | |
4246a0b6 | 1948 | int error = sbio->bi_error; |
a68e5870 | 1949 | |
2aabaa65 | 1950 | if (sbio->bi_end_io != end_sync_read) |
78d7f5f7 | 1951 | continue; |
4246a0b6 CH |
1952 | /* Now we can 'fixup' the error value */ |
1953 | sbio->bi_error = 0; | |
78d7f5f7 | 1954 | |
4246a0b6 | 1955 | if (!error) { |
78d7f5f7 N |
1956 | for (j = vcnt; j-- ; ) { |
1957 | struct page *p, *s; | |
1958 | p = pbio->bi_io_vec[j].bv_page; | |
1959 | s = sbio->bi_io_vec[j].bv_page; | |
1960 | if (memcmp(page_address(p), | |
1961 | page_address(s), | |
5020ad7d | 1962 | sbio->bi_io_vec[j].bv_len)) |
78d7f5f7 | 1963 | break; |
69382e85 | 1964 | } |
78d7f5f7 N |
1965 | } else |
1966 | j = 0; | |
1967 | if (j >= 0) | |
7f7583d4 | 1968 | atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); |
78d7f5f7 | 1969 | if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) |
4246a0b6 | 1970 | && !error)) { |
78d7f5f7 N |
1971 | /* No need to write to this device. */ |
1972 | sbio->bi_end_io = NULL; | |
1973 | rdev_dec_pending(conf->mirrors[i].rdev, mddev); | |
1974 | continue; | |
1975 | } | |
d3b45c2a KO |
1976 | |
1977 | bio_copy_data(sbio, pbio); | |
78d7f5f7 | 1978 | } |
a68e5870 N |
1979 | } |
1980 | ||
9f2c9d12 | 1981 | static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) |
a68e5870 | 1982 | { |
e8096360 | 1983 | struct r1conf *conf = mddev->private; |
a68e5870 | 1984 | int i; |
8f19ccb2 | 1985 | int disks = conf->raid_disks * 2; |
a68e5870 N |
1986 | struct bio *bio, *wbio; |
1987 | ||
1988 | bio = r1_bio->bios[r1_bio->read_disk]; | |
1989 | ||
a68e5870 N |
1990 | if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) |
1991 | /* ouch - failed to read all of that. */ | |
1992 | if (!fix_sync_read_error(r1_bio)) | |
1993 | return; | |
7ca78d57 N |
1994 | |
1995 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
c95e6385 N |
1996 | process_checks(r1_bio); |
1997 | ||
d11c171e N |
1998 | /* |
1999 | * schedule writes | |
2000 | */ | |
1da177e4 LT |
2001 | atomic_set(&r1_bio->remaining, 1); |
2002 | for (i = 0; i < disks ; i++) { | |
2003 | wbio = r1_bio->bios[i]; | |
3e198f78 N |
2004 | if (wbio->bi_end_io == NULL || |
2005 | (wbio->bi_end_io == end_sync_read && | |
2006 | (i == r1_bio->read_disk || | |
2007 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) | |
1da177e4 LT |
2008 | continue; |
2009 | ||
796a5cf0 | 2010 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
3e198f78 | 2011 | wbio->bi_end_io = end_sync_write; |
1da177e4 | 2012 | atomic_inc(&r1_bio->remaining); |
aa8b57aa | 2013 | md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); |
191ea9b2 | 2014 | |
1da177e4 LT |
2015 | generic_make_request(wbio); |
2016 | } | |
2017 | ||
2018 | if (atomic_dec_and_test(&r1_bio->remaining)) { | |
191ea9b2 | 2019 | /* if we're here, all write(s) have completed, so clean up */ |
58e94ae1 N |
2020 | int s = r1_bio->sectors; |
2021 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || | |
2022 | test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2023 | reschedule_retry(r1_bio); | |
2024 | else { | |
2025 | put_buf(r1_bio); | |
2026 | md_done_sync(mddev, s, 1); | |
2027 | } | |
1da177e4 LT |
2028 | } |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * This is a kernel thread which: | |
2033 | * | |
2034 | * 1. Retries failed read operations on working mirrors. | |
2035 | * 2. Updates the raid superblock when problems encounter. | |
d2eb35ac | 2036 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2037 | */ |
2038 | ||
e8096360 | 2039 | static void fix_read_error(struct r1conf *conf, int read_disk, |
867868fb N |
2040 | sector_t sect, int sectors) |
2041 | { | |
fd01b88c | 2042 | struct mddev *mddev = conf->mddev; |
867868fb N |
2043 | while(sectors) { |
2044 | int s = sectors; | |
2045 | int d = read_disk; | |
2046 | int success = 0; | |
2047 | int start; | |
3cb03002 | 2048 | struct md_rdev *rdev; |
867868fb N |
2049 | |
2050 | if (s > (PAGE_SIZE>>9)) | |
2051 | s = PAGE_SIZE >> 9; | |
2052 | ||
2053 | do { | |
d2eb35ac N |
2054 | sector_t first_bad; |
2055 | int bad_sectors; | |
2056 | ||
707a6a42 N |
2057 | rcu_read_lock(); |
2058 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2059 | if (rdev && |
da8840a7 | 2060 | (test_bit(In_sync, &rdev->flags) || |
2061 | (!test_bit(Faulty, &rdev->flags) && | |
2062 | rdev->recovery_offset >= sect + s)) && | |
d2eb35ac | 2063 | is_badblock(rdev, sect, s, |
707a6a42 N |
2064 | &first_bad, &bad_sectors) == 0) { |
2065 | atomic_inc(&rdev->nr_pending); | |
2066 | rcu_read_unlock(); | |
2067 | if (sync_page_io(rdev, sect, s<<9, | |
796a5cf0 | 2068 | conf->tmppage, REQ_OP_READ, 0, false)) |
707a6a42 N |
2069 | success = 1; |
2070 | rdev_dec_pending(rdev, mddev); | |
2071 | if (success) | |
2072 | break; | |
2073 | } else | |
2074 | rcu_read_unlock(); | |
2075 | d++; | |
2076 | if (d == conf->raid_disks * 2) | |
2077 | d = 0; | |
867868fb N |
2078 | } while (!success && d != read_disk); |
2079 | ||
2080 | if (!success) { | |
d8f05d29 | 2081 | /* Cannot read from anywhere - mark it bad */ |
3cb03002 | 2082 | struct md_rdev *rdev = conf->mirrors[read_disk].rdev; |
d8f05d29 N |
2083 | if (!rdev_set_badblocks(rdev, sect, s, 0)) |
2084 | md_error(mddev, rdev); | |
867868fb N |
2085 | break; |
2086 | } | |
2087 | /* write it back and re-read */ | |
2088 | start = d; | |
2089 | while (d != read_disk) { | |
2090 | if (d==0) | |
8f19ccb2 | 2091 | d = conf->raid_disks * 2; |
867868fb | 2092 | d--; |
707a6a42 N |
2093 | rcu_read_lock(); |
2094 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2095 | if (rdev && |
707a6a42 N |
2096 | !test_bit(Faulty, &rdev->flags)) { |
2097 | atomic_inc(&rdev->nr_pending); | |
2098 | rcu_read_unlock(); | |
d8f05d29 N |
2099 | r1_sync_page_io(rdev, sect, s, |
2100 | conf->tmppage, WRITE); | |
707a6a42 N |
2101 | rdev_dec_pending(rdev, mddev); |
2102 | } else | |
2103 | rcu_read_unlock(); | |
867868fb N |
2104 | } |
2105 | d = start; | |
2106 | while (d != read_disk) { | |
2107 | char b[BDEVNAME_SIZE]; | |
2108 | if (d==0) | |
8f19ccb2 | 2109 | d = conf->raid_disks * 2; |
867868fb | 2110 | d--; |
707a6a42 N |
2111 | rcu_read_lock(); |
2112 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
867868fb | 2113 | if (rdev && |
b8cb6b4c | 2114 | !test_bit(Faulty, &rdev->flags)) { |
707a6a42 N |
2115 | atomic_inc(&rdev->nr_pending); |
2116 | rcu_read_unlock(); | |
d8f05d29 N |
2117 | if (r1_sync_page_io(rdev, sect, s, |
2118 | conf->tmppage, READ)) { | |
867868fb | 2119 | atomic_add(s, &rdev->corrected_errors); |
1d41c216 N |
2120 | pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", |
2121 | mdname(mddev), s, | |
2122 | (unsigned long long)(sect + | |
2123 | rdev->data_offset), | |
2124 | bdevname(rdev->bdev, b)); | |
867868fb | 2125 | } |
707a6a42 N |
2126 | rdev_dec_pending(rdev, mddev); |
2127 | } else | |
2128 | rcu_read_unlock(); | |
867868fb N |
2129 | } |
2130 | sectors -= s; | |
2131 | sect += s; | |
2132 | } | |
2133 | } | |
2134 | ||
9f2c9d12 | 2135 | static int narrow_write_error(struct r1bio *r1_bio, int i) |
cd5ff9a1 | 2136 | { |
fd01b88c | 2137 | struct mddev *mddev = r1_bio->mddev; |
e8096360 | 2138 | struct r1conf *conf = mddev->private; |
3cb03002 | 2139 | struct md_rdev *rdev = conf->mirrors[i].rdev; |
cd5ff9a1 N |
2140 | |
2141 | /* bio has the data to be written to device 'i' where | |
2142 | * we just recently had a write error. | |
2143 | * We repeatedly clone the bio and trim down to one block, | |
2144 | * then try the write. Where the write fails we record | |
2145 | * a bad block. | |
2146 | * It is conceivable that the bio doesn't exactly align with | |
2147 | * blocks. We must handle this somehow. | |
2148 | * | |
2149 | * We currently own a reference on the rdev. | |
2150 | */ | |
2151 | ||
2152 | int block_sectors; | |
2153 | sector_t sector; | |
2154 | int sectors; | |
2155 | int sect_to_write = r1_bio->sectors; | |
2156 | int ok = 1; | |
2157 | ||
2158 | if (rdev->badblocks.shift < 0) | |
2159 | return 0; | |
2160 | ||
ab713cdc ND |
2161 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2162 | bdev_logical_block_size(rdev->bdev) >> 9); | |
cd5ff9a1 N |
2163 | sector = r1_bio->sector; |
2164 | sectors = ((sector + block_sectors) | |
2165 | & ~(sector_t)(block_sectors - 1)) | |
2166 | - sector; | |
2167 | ||
cd5ff9a1 N |
2168 | while (sect_to_write) { |
2169 | struct bio *wbio; | |
2170 | if (sectors > sect_to_write) | |
2171 | sectors = sect_to_write; | |
2172 | /* Write at 'sector' for 'sectors'*/ | |
2173 | ||
b783863f KO |
2174 | if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { |
2175 | unsigned vcnt = r1_bio->behind_page_count; | |
2176 | struct bio_vec *vec = r1_bio->behind_bvecs; | |
2177 | ||
2178 | while (!vec->bv_page) { | |
2179 | vec++; | |
2180 | vcnt--; | |
2181 | } | |
2182 | ||
2183 | wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); | |
2184 | memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); | |
2185 | ||
2186 | wbio->bi_vcnt = vcnt; | |
2187 | } else { | |
2188 | wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
2189 | } | |
2190 | ||
796a5cf0 | 2191 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4f024f37 KO |
2192 | wbio->bi_iter.bi_sector = r1_bio->sector; |
2193 | wbio->bi_iter.bi_size = r1_bio->sectors << 9; | |
cd5ff9a1 | 2194 | |
6678d83f | 2195 | bio_trim(wbio, sector - r1_bio->sector, sectors); |
4f024f37 | 2196 | wbio->bi_iter.bi_sector += rdev->data_offset; |
cd5ff9a1 | 2197 | wbio->bi_bdev = rdev->bdev; |
4e49ea4a MC |
2198 | |
2199 | if (submit_bio_wait(wbio) < 0) | |
cd5ff9a1 N |
2200 | /* failure! */ |
2201 | ok = rdev_set_badblocks(rdev, sector, | |
2202 | sectors, 0) | |
2203 | && ok; | |
2204 | ||
2205 | bio_put(wbio); | |
2206 | sect_to_write -= sectors; | |
2207 | sector += sectors; | |
2208 | sectors = block_sectors; | |
2209 | } | |
2210 | return ok; | |
2211 | } | |
2212 | ||
e8096360 | 2213 | static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2214 | { |
2215 | int m; | |
2216 | int s = r1_bio->sectors; | |
8f19ccb2 | 2217 | for (m = 0; m < conf->raid_disks * 2 ; m++) { |
3cb03002 | 2218 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2219 | struct bio *bio = r1_bio->bios[m]; |
2220 | if (bio->bi_end_io == NULL) | |
2221 | continue; | |
4246a0b6 | 2222 | if (!bio->bi_error && |
62096bce | 2223 | test_bit(R1BIO_MadeGood, &r1_bio->state)) { |
c6563a8c | 2224 | rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); |
62096bce | 2225 | } |
4246a0b6 | 2226 | if (bio->bi_error && |
62096bce N |
2227 | test_bit(R1BIO_WriteError, &r1_bio->state)) { |
2228 | if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) | |
2229 | md_error(conf->mddev, rdev); | |
2230 | } | |
2231 | } | |
2232 | put_buf(r1_bio); | |
2233 | md_done_sync(conf->mddev, s, 1); | |
2234 | } | |
2235 | ||
e8096360 | 2236 | static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2237 | { |
2238 | int m; | |
55ce74d4 | 2239 | bool fail = false; |
8f19ccb2 | 2240 | for (m = 0; m < conf->raid_disks * 2 ; m++) |
62096bce | 2241 | if (r1_bio->bios[m] == IO_MADE_GOOD) { |
3cb03002 | 2242 | struct md_rdev *rdev = conf->mirrors[m].rdev; |
62096bce N |
2243 | rdev_clear_badblocks(rdev, |
2244 | r1_bio->sector, | |
c6563a8c | 2245 | r1_bio->sectors, 0); |
62096bce N |
2246 | rdev_dec_pending(rdev, conf->mddev); |
2247 | } else if (r1_bio->bios[m] != NULL) { | |
2248 | /* This drive got a write error. We need to | |
2249 | * narrow down and record precise write | |
2250 | * errors. | |
2251 | */ | |
55ce74d4 | 2252 | fail = true; |
62096bce N |
2253 | if (!narrow_write_error(r1_bio, m)) { |
2254 | md_error(conf->mddev, | |
2255 | conf->mirrors[m].rdev); | |
2256 | /* an I/O failed, we can't clear the bitmap */ | |
2257 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2258 | } | |
2259 | rdev_dec_pending(conf->mirrors[m].rdev, | |
2260 | conf->mddev); | |
2261 | } | |
55ce74d4 N |
2262 | if (fail) { |
2263 | spin_lock_irq(&conf->device_lock); | |
2264 | list_add(&r1_bio->retry_list, &conf->bio_end_io_list); | |
ccfc7bf1 | 2265 | conf->nr_queued++; |
55ce74d4 N |
2266 | spin_unlock_irq(&conf->device_lock); |
2267 | md_wakeup_thread(conf->mddev->thread); | |
bd8688a1 N |
2268 | } else { |
2269 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2270 | close_write(r1_bio); | |
55ce74d4 | 2271 | raid_end_bio_io(r1_bio); |
bd8688a1 | 2272 | } |
62096bce N |
2273 | } |
2274 | ||
e8096360 | 2275 | static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) |
62096bce N |
2276 | { |
2277 | int disk; | |
2278 | int max_sectors; | |
fd01b88c | 2279 | struct mddev *mddev = conf->mddev; |
62096bce N |
2280 | struct bio *bio; |
2281 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 2282 | struct md_rdev *rdev; |
62096bce N |
2283 | |
2284 | clear_bit(R1BIO_ReadError, &r1_bio->state); | |
2285 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2286 | * the block and we can fix it. | |
2287 | * We freeze all other IO, and try reading the block from | |
2288 | * other devices. When we find one, we re-write | |
2289 | * and check it that fixes the read error. | |
2290 | * This is all done synchronously while the array is | |
2291 | * frozen | |
2292 | */ | |
7449f699 TM |
2293 | |
2294 | bio = r1_bio->bios[r1_bio->read_disk]; | |
2295 | bdevname(bio->bi_bdev, b); | |
2296 | bio_put(bio); | |
2297 | r1_bio->bios[r1_bio->read_disk] = NULL; | |
2298 | ||
62096bce | 2299 | if (mddev->ro == 0) { |
e2d59925 | 2300 | freeze_array(conf, 1); |
62096bce N |
2301 | fix_read_error(conf, r1_bio->read_disk, |
2302 | r1_bio->sector, r1_bio->sectors); | |
2303 | unfreeze_array(conf); | |
7449f699 TM |
2304 | } else { |
2305 | r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; | |
2306 | } | |
2307 | ||
7ad4d4a6 | 2308 | rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); |
62096bce | 2309 | |
62096bce N |
2310 | read_more: |
2311 | disk = read_balance(conf, r1_bio, &max_sectors); | |
2312 | if (disk == -1) { | |
1d41c216 N |
2313 | pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", |
2314 | mdname(mddev), b, (unsigned long long)r1_bio->sector); | |
62096bce N |
2315 | raid_end_bio_io(r1_bio); |
2316 | } else { | |
2317 | const unsigned long do_sync | |
1eff9d32 | 2318 | = r1_bio->master_bio->bi_opf & REQ_SYNC; |
62096bce N |
2319 | r1_bio->read_disk = disk; |
2320 | bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); | |
4f024f37 KO |
2321 | bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, |
2322 | max_sectors); | |
62096bce N |
2323 | r1_bio->bios[r1_bio->read_disk] = bio; |
2324 | rdev = conf->mirrors[disk].rdev; | |
1d41c216 N |
2325 | pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", |
2326 | mdname(mddev), | |
2327 | (unsigned long long)r1_bio->sector, | |
2328 | bdevname(rdev->bdev, b)); | |
4f024f37 | 2329 | bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; |
62096bce N |
2330 | bio->bi_bdev = rdev->bdev; |
2331 | bio->bi_end_io = raid1_end_read_request; | |
796a5cf0 | 2332 | bio_set_op_attrs(bio, REQ_OP_READ, do_sync); |
62096bce N |
2333 | bio->bi_private = r1_bio; |
2334 | if (max_sectors < r1_bio->sectors) { | |
2335 | /* Drat - have to split this up more */ | |
2336 | struct bio *mbio = r1_bio->master_bio; | |
2337 | int sectors_handled = (r1_bio->sector + max_sectors | |
4f024f37 | 2338 | - mbio->bi_iter.bi_sector); |
62096bce N |
2339 | r1_bio->sectors = max_sectors; |
2340 | spin_lock_irq(&conf->device_lock); | |
2341 | if (mbio->bi_phys_segments == 0) | |
2342 | mbio->bi_phys_segments = 2; | |
2343 | else | |
2344 | mbio->bi_phys_segments++; | |
2345 | spin_unlock_irq(&conf->device_lock); | |
2346 | generic_make_request(bio); | |
2347 | bio = NULL; | |
2348 | ||
2349 | r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); | |
2350 | ||
2351 | r1_bio->master_bio = mbio; | |
aa8b57aa | 2352 | r1_bio->sectors = bio_sectors(mbio) - sectors_handled; |
62096bce N |
2353 | r1_bio->state = 0; |
2354 | set_bit(R1BIO_ReadError, &r1_bio->state); | |
2355 | r1_bio->mddev = mddev; | |
4f024f37 KO |
2356 | r1_bio->sector = mbio->bi_iter.bi_sector + |
2357 | sectors_handled; | |
62096bce N |
2358 | |
2359 | goto read_more; | |
2360 | } else | |
2361 | generic_make_request(bio); | |
2362 | } | |
2363 | } | |
2364 | ||
4ed8731d | 2365 | static void raid1d(struct md_thread *thread) |
1da177e4 | 2366 | { |
4ed8731d | 2367 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2368 | struct r1bio *r1_bio; |
1da177e4 | 2369 | unsigned long flags; |
e8096360 | 2370 | struct r1conf *conf = mddev->private; |
1da177e4 | 2371 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2372 | struct blk_plug plug; |
1da177e4 LT |
2373 | |
2374 | md_check_recovery(mddev); | |
e1dfa0a2 | 2375 | |
55ce74d4 N |
2376 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2377 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)) { | |
2378 | LIST_HEAD(tmp); | |
2379 | spin_lock_irqsave(&conf->device_lock, flags); | |
2380 | if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) { | |
ccfc7bf1 ND |
2381 | while (!list_empty(&conf->bio_end_io_list)) { |
2382 | list_move(conf->bio_end_io_list.prev, &tmp); | |
2383 | conf->nr_queued--; | |
2384 | } | |
55ce74d4 N |
2385 | } |
2386 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
2387 | while (!list_empty(&tmp)) { | |
a452744b MP |
2388 | r1_bio = list_first_entry(&tmp, struct r1bio, |
2389 | retry_list); | |
55ce74d4 | 2390 | list_del(&r1_bio->retry_list); |
bd8688a1 N |
2391 | if (mddev->degraded) |
2392 | set_bit(R1BIO_Degraded, &r1_bio->state); | |
2393 | if (test_bit(R1BIO_WriteError, &r1_bio->state)) | |
2394 | close_write(r1_bio); | |
55ce74d4 N |
2395 | raid_end_bio_io(r1_bio); |
2396 | } | |
2397 | } | |
2398 | ||
e1dfa0a2 | 2399 | blk_start_plug(&plug); |
1da177e4 | 2400 | for (;;) { |
191ea9b2 | 2401 | |
0021b7bc | 2402 | flush_pending_writes(conf); |
191ea9b2 | 2403 | |
a35e63ef N |
2404 | spin_lock_irqsave(&conf->device_lock, flags); |
2405 | if (list_empty(head)) { | |
2406 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2407 | break; |
a35e63ef | 2408 | } |
9f2c9d12 | 2409 | r1_bio = list_entry(head->prev, struct r1bio, retry_list); |
1da177e4 | 2410 | list_del(head->prev); |
ddaf22ab | 2411 | conf->nr_queued--; |
1da177e4 LT |
2412 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2413 | ||
2414 | mddev = r1_bio->mddev; | |
070ec55d | 2415 | conf = mddev->private; |
4367af55 | 2416 | if (test_bit(R1BIO_IsSync, &r1_bio->state)) { |
d8f05d29 | 2417 | if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2418 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2419 | handle_sync_write_finished(conf, r1_bio); | |
2420 | else | |
4367af55 | 2421 | sync_request_write(mddev, r1_bio); |
cd5ff9a1 | 2422 | } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || |
62096bce N |
2423 | test_bit(R1BIO_WriteError, &r1_bio->state)) |
2424 | handle_write_finished(conf, r1_bio); | |
2425 | else if (test_bit(R1BIO_ReadError, &r1_bio->state)) | |
2426 | handle_read_error(conf, r1_bio); | |
2427 | else | |
d2eb35ac N |
2428 | /* just a partial read to be scheduled from separate |
2429 | * context | |
2430 | */ | |
2431 | generic_make_request(r1_bio->bios[r1_bio->read_disk]); | |
62096bce | 2432 | |
1d9d5241 | 2433 | cond_resched(); |
de393cde N |
2434 | if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) |
2435 | md_check_recovery(mddev); | |
1da177e4 | 2436 | } |
e1dfa0a2 | 2437 | blk_finish_plug(&plug); |
1da177e4 LT |
2438 | } |
2439 | ||
e8096360 | 2440 | static int init_resync(struct r1conf *conf) |
1da177e4 LT |
2441 | { |
2442 | int buffs; | |
2443 | ||
2444 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
9e77c485 | 2445 | BUG_ON(conf->r1buf_pool); |
1da177e4 LT |
2446 | conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, |
2447 | conf->poolinfo); | |
2448 | if (!conf->r1buf_pool) | |
2449 | return -ENOMEM; | |
2450 | conf->next_resync = 0; | |
2451 | return 0; | |
2452 | } | |
2453 | ||
2454 | /* | |
2455 | * perform a "sync" on one "block" | |
2456 | * | |
2457 | * We need to make sure that no normal I/O request - particularly write | |
2458 | * requests - conflict with active sync requests. | |
2459 | * | |
2460 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2461 | * that can be installed to exclude normal IO requests. | |
2462 | */ | |
2463 | ||
849674e4 SL |
2464 | static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, |
2465 | int *skipped) | |
1da177e4 | 2466 | { |
e8096360 | 2467 | struct r1conf *conf = mddev->private; |
9f2c9d12 | 2468 | struct r1bio *r1_bio; |
1da177e4 LT |
2469 | struct bio *bio; |
2470 | sector_t max_sector, nr_sectors; | |
3e198f78 | 2471 | int disk = -1; |
1da177e4 | 2472 | int i; |
3e198f78 N |
2473 | int wonly = -1; |
2474 | int write_targets = 0, read_targets = 0; | |
57dab0bd | 2475 | sector_t sync_blocks; |
e3b9703e | 2476 | int still_degraded = 0; |
06f60385 N |
2477 | int good_sectors = RESYNC_SECTORS; |
2478 | int min_bad = 0; /* number of sectors that are bad in all devices */ | |
1da177e4 LT |
2479 | |
2480 | if (!conf->r1buf_pool) | |
2481 | if (init_resync(conf)) | |
57afd89f | 2482 | return 0; |
1da177e4 | 2483 | |
58c0fed4 | 2484 | max_sector = mddev->dev_sectors; |
1da177e4 | 2485 | if (sector_nr >= max_sector) { |
191ea9b2 N |
2486 | /* If we aborted, we need to abort the |
2487 | * sync on the 'current' bitmap chunk (there will | |
2488 | * only be one in raid1 resync. | |
2489 | * We can find the current addess in mddev->curr_resync | |
2490 | */ | |
6a806c51 N |
2491 | if (mddev->curr_resync < max_sector) /* aborted */ |
2492 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
191ea9b2 | 2493 | &sync_blocks, 1); |
6a806c51 | 2494 | else /* completed sync */ |
191ea9b2 | 2495 | conf->fullsync = 0; |
6a806c51 N |
2496 | |
2497 | bitmap_close_sync(mddev->bitmap); | |
1da177e4 | 2498 | close_sync(conf); |
c40f341f GR |
2499 | |
2500 | if (mddev_is_clustered(mddev)) { | |
2501 | conf->cluster_sync_low = 0; | |
2502 | conf->cluster_sync_high = 0; | |
c40f341f | 2503 | } |
1da177e4 LT |
2504 | return 0; |
2505 | } | |
2506 | ||
07d84d10 N |
2507 | if (mddev->bitmap == NULL && |
2508 | mddev->recovery_cp == MaxSector && | |
6394cca5 | 2509 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
07d84d10 N |
2510 | conf->fullsync == 0) { |
2511 | *skipped = 1; | |
2512 | return max_sector - sector_nr; | |
2513 | } | |
6394cca5 N |
2514 | /* before building a request, check if we can skip these blocks.. |
2515 | * This call the bitmap_start_sync doesn't actually record anything | |
2516 | */ | |
e3b9703e | 2517 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && |
e5de485f | 2518 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
191ea9b2 N |
2519 | /* We can skip this block, and probably several more */ |
2520 | *skipped = 1; | |
2521 | return sync_blocks; | |
2522 | } | |
17999be4 | 2523 | |
7ac50447 TM |
2524 | /* |
2525 | * If there is non-resync activity waiting for a turn, then let it | |
2526 | * though before starting on this new sync request. | |
2527 | */ | |
2528 | if (conf->nr_waiting) | |
2529 | schedule_timeout_uninterruptible(1); | |
2530 | ||
c40f341f GR |
2531 | /* we are incrementing sector_nr below. To be safe, we check against |
2532 | * sector_nr + two times RESYNC_SECTORS | |
2533 | */ | |
2534 | ||
2535 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, | |
2536 | mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); | |
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)) { |
796a5cf0 | 2567 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1da177e4 LT |
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 | } | |
796a5cf0 | 2594 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
06f60385 N |
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 | */ | |
796a5cf0 | 2606 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
d57368af AL |
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; |
7571ae88 | 2694 | if ((len >> 9) > sync_blocks) |
6a806c51 | 2695 | len = sync_blocks<<9; |
ab7a30c7 | 2696 | } |
191ea9b2 | 2697 | |
8f19ccb2 | 2698 | for (i = 0 ; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2699 | bio = r1_bio->bios[i]; |
2700 | if (bio->bi_end_io) { | |
d11c171e | 2701 | page = bio->bi_io_vec[bio->bi_vcnt].bv_page; |
1da177e4 LT |
2702 | if (bio_add_page(bio, page, len, 0) == 0) { |
2703 | /* stop here */ | |
d11c171e | 2704 | bio->bi_io_vec[bio->bi_vcnt].bv_page = page; |
1da177e4 LT |
2705 | while (i > 0) { |
2706 | i--; | |
2707 | bio = r1_bio->bios[i]; | |
6a806c51 N |
2708 | if (bio->bi_end_io==NULL) |
2709 | continue; | |
1da177e4 LT |
2710 | /* remove last page from this bio */ |
2711 | bio->bi_vcnt--; | |
4f024f37 | 2712 | bio->bi_iter.bi_size -= len; |
b7c44ed9 | 2713 | bio_clear_flag(bio, BIO_SEG_VALID); |
1da177e4 LT |
2714 | } |
2715 | goto bio_full; | |
2716 | } | |
2717 | } | |
2718 | } | |
2719 | nr_sectors += len>>9; | |
2720 | sector_nr += len>>9; | |
191ea9b2 | 2721 | sync_blocks -= (len>>9); |
1da177e4 LT |
2722 | } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); |
2723 | bio_full: | |
1da177e4 LT |
2724 | r1_bio->sectors = nr_sectors; |
2725 | ||
c40f341f GR |
2726 | if (mddev_is_clustered(mddev) && |
2727 | conf->cluster_sync_high < sector_nr + nr_sectors) { | |
2728 | conf->cluster_sync_low = mddev->curr_resync_completed; | |
2729 | conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; | |
2730 | /* Send resync message */ | |
2731 | md_cluster_ops->resync_info_update(mddev, | |
2732 | conf->cluster_sync_low, | |
2733 | conf->cluster_sync_high); | |
2734 | } | |
2735 | ||
d11c171e N |
2736 | /* For a user-requested sync, we read all readable devices and do a |
2737 | * compare | |
2738 | */ | |
2739 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2740 | atomic_set(&r1_bio->remaining, read_targets); | |
2d4f4f33 | 2741 | for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { |
d11c171e N |
2742 | bio = r1_bio->bios[i]; |
2743 | if (bio->bi_end_io == end_sync_read) { | |
2d4f4f33 | 2744 | read_targets--; |
ddac7c7e | 2745 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e N |
2746 | generic_make_request(bio); |
2747 | } | |
2748 | } | |
2749 | } else { | |
2750 | atomic_set(&r1_bio->remaining, 1); | |
2751 | bio = r1_bio->bios[r1_bio->read_disk]; | |
ddac7c7e | 2752 | md_sync_acct(bio->bi_bdev, nr_sectors); |
d11c171e | 2753 | generic_make_request(bio); |
1da177e4 | 2754 | |
d11c171e | 2755 | } |
1da177e4 LT |
2756 | return nr_sectors; |
2757 | } | |
2758 | ||
fd01b88c | 2759 | static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
2760 | { |
2761 | if (sectors) | |
2762 | return sectors; | |
2763 | ||
2764 | return mddev->dev_sectors; | |
2765 | } | |
2766 | ||
e8096360 | 2767 | static struct r1conf *setup_conf(struct mddev *mddev) |
1da177e4 | 2768 | { |
e8096360 | 2769 | struct r1conf *conf; |
709ae487 | 2770 | int i; |
0eaf822c | 2771 | struct raid1_info *disk; |
3cb03002 | 2772 | struct md_rdev *rdev; |
709ae487 | 2773 | int err = -ENOMEM; |
1da177e4 | 2774 | |
e8096360 | 2775 | conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); |
1da177e4 | 2776 | if (!conf) |
709ae487 | 2777 | goto abort; |
1da177e4 | 2778 | |
0eaf822c | 2779 | conf->mirrors = kzalloc(sizeof(struct raid1_info) |
8f19ccb2 | 2780 | * mddev->raid_disks * 2, |
1da177e4 LT |
2781 | GFP_KERNEL); |
2782 | if (!conf->mirrors) | |
709ae487 | 2783 | goto abort; |
1da177e4 | 2784 | |
ddaf22ab N |
2785 | conf->tmppage = alloc_page(GFP_KERNEL); |
2786 | if (!conf->tmppage) | |
709ae487 | 2787 | goto abort; |
ddaf22ab | 2788 | |
709ae487 | 2789 | conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); |
1da177e4 | 2790 | if (!conf->poolinfo) |
709ae487 | 2791 | goto abort; |
8f19ccb2 | 2792 | conf->poolinfo->raid_disks = mddev->raid_disks * 2; |
1da177e4 LT |
2793 | conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, |
2794 | r1bio_pool_free, | |
2795 | conf->poolinfo); | |
2796 | if (!conf->r1bio_pool) | |
709ae487 N |
2797 | goto abort; |
2798 | ||
ed9bfdf1 | 2799 | conf->poolinfo->mddev = mddev; |
1da177e4 | 2800 | |
c19d5798 | 2801 | err = -EINVAL; |
e7e72bf6 | 2802 | spin_lock_init(&conf->device_lock); |
dafb20fa | 2803 | rdev_for_each(rdev, mddev) { |
aba336bd | 2804 | struct request_queue *q; |
709ae487 | 2805 | int disk_idx = rdev->raid_disk; |
1da177e4 LT |
2806 | if (disk_idx >= mddev->raid_disks |
2807 | || disk_idx < 0) | |
2808 | continue; | |
c19d5798 | 2809 | if (test_bit(Replacement, &rdev->flags)) |
02b898f2 | 2810 | disk = conf->mirrors + mddev->raid_disks + disk_idx; |
c19d5798 N |
2811 | else |
2812 | disk = conf->mirrors + disk_idx; | |
1da177e4 | 2813 | |
c19d5798 N |
2814 | if (disk->rdev) |
2815 | goto abort; | |
1da177e4 | 2816 | disk->rdev = rdev; |
aba336bd | 2817 | q = bdev_get_queue(rdev->bdev); |
1da177e4 LT |
2818 | |
2819 | disk->head_position = 0; | |
12cee5a8 | 2820 | disk->seq_start = MaxSector; |
1da177e4 LT |
2821 | } |
2822 | conf->raid_disks = mddev->raid_disks; | |
2823 | conf->mddev = mddev; | |
1da177e4 | 2824 | INIT_LIST_HEAD(&conf->retry_list); |
55ce74d4 | 2825 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
1da177e4 LT |
2826 | |
2827 | spin_lock_init(&conf->resync_lock); | |
17999be4 | 2828 | init_waitqueue_head(&conf->wait_barrier); |
1da177e4 | 2829 | |
191ea9b2 | 2830 | bio_list_init(&conf->pending_bio_list); |
34db0cd6 | 2831 | conf->pending_count = 0; |
d890fa2b | 2832 | conf->recovery_disabled = mddev->recovery_disabled - 1; |
191ea9b2 | 2833 | |
79ef3a8a | 2834 | conf->start_next_window = MaxSector; |
2835 | conf->current_window_requests = conf->next_window_requests = 0; | |
2836 | ||
c19d5798 | 2837 | err = -EIO; |
8f19ccb2 | 2838 | for (i = 0; i < conf->raid_disks * 2; i++) { |
1da177e4 LT |
2839 | |
2840 | disk = conf->mirrors + i; | |
2841 | ||
c19d5798 N |
2842 | if (i < conf->raid_disks && |
2843 | disk[conf->raid_disks].rdev) { | |
2844 | /* This slot has a replacement. */ | |
2845 | if (!disk->rdev) { | |
2846 | /* No original, just make the replacement | |
2847 | * a recovering spare | |
2848 | */ | |
2849 | disk->rdev = | |
2850 | disk[conf->raid_disks].rdev; | |
2851 | disk[conf->raid_disks].rdev = NULL; | |
2852 | } else if (!test_bit(In_sync, &disk->rdev->flags)) | |
2853 | /* Original is not in_sync - bad */ | |
2854 | goto abort; | |
2855 | } | |
2856 | ||
5fd6c1dc N |
2857 | if (!disk->rdev || |
2858 | !test_bit(In_sync, &disk->rdev->flags)) { | |
1da177e4 | 2859 | disk->head_position = 0; |
4f0a5e01 JB |
2860 | if (disk->rdev && |
2861 | (disk->rdev->saved_raid_disk < 0)) | |
918f0238 | 2862 | conf->fullsync = 1; |
be4d3280 | 2863 | } |
1da177e4 | 2864 | } |
709ae487 | 2865 | |
709ae487 | 2866 | err = -ENOMEM; |
0232605d | 2867 | conf->thread = md_register_thread(raid1d, mddev, "raid1"); |
1d41c216 | 2868 | if (!conf->thread) |
709ae487 | 2869 | goto abort; |
1da177e4 | 2870 | |
709ae487 N |
2871 | return conf; |
2872 | ||
2873 | abort: | |
2874 | if (conf) { | |
644df1a8 | 2875 | mempool_destroy(conf->r1bio_pool); |
709ae487 N |
2876 | kfree(conf->mirrors); |
2877 | safe_put_page(conf->tmppage); | |
2878 | kfree(conf->poolinfo); | |
2879 | kfree(conf); | |
2880 | } | |
2881 | return ERR_PTR(err); | |
2882 | } | |
2883 | ||
afa0f557 | 2884 | static void raid1_free(struct mddev *mddev, void *priv); |
849674e4 | 2885 | static int raid1_run(struct mddev *mddev) |
709ae487 | 2886 | { |
e8096360 | 2887 | struct r1conf *conf; |
709ae487 | 2888 | int i; |
3cb03002 | 2889 | struct md_rdev *rdev; |
5220ea1e | 2890 | int ret; |
2ff8cc2c | 2891 | bool discard_supported = false; |
709ae487 N |
2892 | |
2893 | if (mddev->level != 1) { | |
1d41c216 N |
2894 | pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", |
2895 | mdname(mddev), mddev->level); | |
709ae487 N |
2896 | return -EIO; |
2897 | } | |
2898 | if (mddev->reshape_position != MaxSector) { | |
1d41c216 N |
2899 | pr_warn("md/raid1:%s: reshape_position set but not supported\n", |
2900 | mdname(mddev)); | |
709ae487 N |
2901 | return -EIO; |
2902 | } | |
1da177e4 | 2903 | /* |
709ae487 N |
2904 | * copy the already verified devices into our private RAID1 |
2905 | * bookkeeping area. [whatever we allocate in run(), | |
afa0f557 | 2906 | * should be freed in raid1_free()] |
1da177e4 | 2907 | */ |
709ae487 N |
2908 | if (mddev->private == NULL) |
2909 | conf = setup_conf(mddev); | |
2910 | else | |
2911 | conf = mddev->private; | |
1da177e4 | 2912 | |
709ae487 N |
2913 | if (IS_ERR(conf)) |
2914 | return PTR_ERR(conf); | |
1da177e4 | 2915 | |
c8dc9c65 | 2916 | if (mddev->queue) |
5026d7a9 PA |
2917 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
2918 | ||
dafb20fa | 2919 | rdev_for_each(rdev, mddev) { |
1ed7242e JB |
2920 | if (!mddev->gendisk) |
2921 | continue; | |
709ae487 N |
2922 | disk_stack_limits(mddev->gendisk, rdev->bdev, |
2923 | rdev->data_offset << 9); | |
2ff8cc2c SL |
2924 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) |
2925 | discard_supported = true; | |
1da177e4 | 2926 | } |
191ea9b2 | 2927 | |
709ae487 N |
2928 | mddev->degraded = 0; |
2929 | for (i=0; i < conf->raid_disks; i++) | |
2930 | if (conf->mirrors[i].rdev == NULL || | |
2931 | !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || | |
2932 | test_bit(Faulty, &conf->mirrors[i].rdev->flags)) | |
2933 | mddev->degraded++; | |
2934 | ||
2935 | if (conf->raid_disks - mddev->degraded == 1) | |
2936 | mddev->recovery_cp = MaxSector; | |
2937 | ||
8c6ac868 | 2938 | if (mddev->recovery_cp != MaxSector) |
1d41c216 N |
2939 | pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", |
2940 | mdname(mddev)); | |
2941 | pr_info("md/raid1:%s: active with %d out of %d mirrors\n", | |
f72ffdd6 | 2942 | mdname(mddev), mddev->raid_disks - mddev->degraded, |
1da177e4 | 2943 | mddev->raid_disks); |
709ae487 | 2944 | |
1da177e4 LT |
2945 | /* |
2946 | * Ok, everything is just fine now | |
2947 | */ | |
709ae487 N |
2948 | mddev->thread = conf->thread; |
2949 | conf->thread = NULL; | |
2950 | mddev->private = conf; | |
2951 | ||
1f403624 | 2952 | md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); |
1da177e4 | 2953 | |
1ed7242e | 2954 | if (mddev->queue) { |
2ff8cc2c SL |
2955 | if (discard_supported) |
2956 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
2957 | mddev->queue); | |
2958 | else | |
2959 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
2960 | mddev->queue); | |
1ed7242e | 2961 | } |
5220ea1e | 2962 | |
2963 | ret = md_integrity_register(mddev); | |
5aa61f42 N |
2964 | if (ret) { |
2965 | md_unregister_thread(&mddev->thread); | |
afa0f557 | 2966 | raid1_free(mddev, conf); |
5aa61f42 | 2967 | } |
5220ea1e | 2968 | return ret; |
1da177e4 LT |
2969 | } |
2970 | ||
afa0f557 | 2971 | static void raid1_free(struct mddev *mddev, void *priv) |
1da177e4 | 2972 | { |
afa0f557 | 2973 | struct r1conf *conf = priv; |
409c57f3 | 2974 | |
644df1a8 | 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 | ||
28c1b9fd GR |
3044 | if (!mddev_is_clustered(mddev)) { |
3045 | err = md_allow_write(mddev); | |
3046 | if (err) | |
3047 | return err; | |
3048 | } | |
2a2275d6 | 3049 | |
63c70c4f N |
3050 | raid_disks = mddev->raid_disks + mddev->delta_disks; |
3051 | ||
6ea9c07c N |
3052 | if (raid_disks < conf->raid_disks) { |
3053 | cnt=0; | |
3054 | for (d= 0; d < conf->raid_disks; d++) | |
3055 | if (conf->mirrors[d].rdev) | |
3056 | cnt++; | |
3057 | if (cnt > raid_disks) | |
1da177e4 | 3058 | return -EBUSY; |
6ea9c07c | 3059 | } |
1da177e4 LT |
3060 | |
3061 | newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); | |
3062 | if (!newpoolinfo) | |
3063 | return -ENOMEM; | |
3064 | newpoolinfo->mddev = mddev; | |
8f19ccb2 | 3065 | newpoolinfo->raid_disks = raid_disks * 2; |
1da177e4 LT |
3066 | |
3067 | newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, | |
3068 | r1bio_pool_free, newpoolinfo); | |
3069 | if (!newpool) { | |
3070 | kfree(newpoolinfo); | |
3071 | return -ENOMEM; | |
3072 | } | |
0eaf822c | 3073 | newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, |
8f19ccb2 | 3074 | GFP_KERNEL); |
1da177e4 LT |
3075 | if (!newmirrors) { |
3076 | kfree(newpoolinfo); | |
3077 | mempool_destroy(newpool); | |
3078 | return -ENOMEM; | |
3079 | } | |
1da177e4 | 3080 | |
e2d59925 | 3081 | freeze_array(conf, 0); |
1da177e4 LT |
3082 | |
3083 | /* ok, everything is stopped */ | |
3084 | oldpool = conf->r1bio_pool; | |
3085 | conf->r1bio_pool = newpool; | |
6ea9c07c | 3086 | |
a88aa786 | 3087 | for (d = d2 = 0; d < conf->raid_disks; d++) { |
3cb03002 | 3088 | struct md_rdev *rdev = conf->mirrors[d].rdev; |
a88aa786 | 3089 | if (rdev && rdev->raid_disk != d2) { |
36fad858 | 3090 | sysfs_unlink_rdev(mddev, rdev); |
a88aa786 | 3091 | rdev->raid_disk = d2; |
36fad858 NK |
3092 | sysfs_unlink_rdev(mddev, rdev); |
3093 | if (sysfs_link_rdev(mddev, rdev)) | |
1d41c216 N |
3094 | pr_warn("md/raid1:%s: cannot register rd%d\n", |
3095 | mdname(mddev), rdev->raid_disk); | |
6ea9c07c | 3096 | } |
a88aa786 N |
3097 | if (rdev) |
3098 | newmirrors[d2++].rdev = rdev; | |
3099 | } | |
1da177e4 LT |
3100 | kfree(conf->mirrors); |
3101 | conf->mirrors = newmirrors; | |
3102 | kfree(conf->poolinfo); | |
3103 | conf->poolinfo = newpoolinfo; | |
3104 | ||
c04be0aa | 3105 | spin_lock_irqsave(&conf->device_lock, flags); |
1da177e4 | 3106 | mddev->degraded += (raid_disks - conf->raid_disks); |
c04be0aa | 3107 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 3108 | conf->raid_disks = mddev->raid_disks = raid_disks; |
63c70c4f | 3109 | mddev->delta_disks = 0; |
1da177e4 | 3110 | |
e2d59925 | 3111 | unfreeze_array(conf); |
1da177e4 | 3112 | |
985ca973 | 3113 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
1da177e4 LT |
3114 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
3115 | md_wakeup_thread(mddev->thread); | |
3116 | ||
3117 | mempool_destroy(oldpool); | |
3118 | return 0; | |
3119 | } | |
3120 | ||
fd01b88c | 3121 | static void raid1_quiesce(struct mddev *mddev, int state) |
36fa3063 | 3122 | { |
e8096360 | 3123 | struct r1conf *conf = mddev->private; |
36fa3063 N |
3124 | |
3125 | switch(state) { | |
6eef4b21 N |
3126 | case 2: /* wake for suspend */ |
3127 | wake_up(&conf->wait_barrier); | |
3128 | break; | |
9e6603da | 3129 | case 1: |
07169fd4 | 3130 | freeze_array(conf, 0); |
36fa3063 | 3131 | break; |
9e6603da | 3132 | case 0: |
07169fd4 | 3133 | unfreeze_array(conf); |
36fa3063 N |
3134 | break; |
3135 | } | |
36fa3063 N |
3136 | } |
3137 | ||
fd01b88c | 3138 | static void *raid1_takeover(struct mddev *mddev) |
709ae487 N |
3139 | { |
3140 | /* raid1 can take over: | |
3141 | * raid5 with 2 devices, any layout or chunk size | |
3142 | */ | |
3143 | if (mddev->level == 5 && mddev->raid_disks == 2) { | |
e8096360 | 3144 | struct r1conf *conf; |
709ae487 N |
3145 | mddev->new_level = 1; |
3146 | mddev->new_layout = 0; | |
3147 | mddev->new_chunk_sectors = 0; | |
3148 | conf = setup_conf(mddev); | |
3149 | if (!IS_ERR(conf)) | |
07169fd4 | 3150 | /* Array must appear to be quiesced */ |
3151 | conf->array_frozen = 1; | |
709ae487 N |
3152 | return conf; |
3153 | } | |
3154 | return ERR_PTR(-EINVAL); | |
3155 | } | |
1da177e4 | 3156 | |
84fc4b56 | 3157 | static struct md_personality raid1_personality = |
1da177e4 LT |
3158 | { |
3159 | .name = "raid1", | |
2604b703 | 3160 | .level = 1, |
1da177e4 | 3161 | .owner = THIS_MODULE, |
849674e4 SL |
3162 | .make_request = raid1_make_request, |
3163 | .run = raid1_run, | |
afa0f557 | 3164 | .free = raid1_free, |
849674e4 SL |
3165 | .status = raid1_status, |
3166 | .error_handler = raid1_error, | |
1da177e4 LT |
3167 | .hot_add_disk = raid1_add_disk, |
3168 | .hot_remove_disk= raid1_remove_disk, | |
3169 | .spare_active = raid1_spare_active, | |
849674e4 | 3170 | .sync_request = raid1_sync_request, |
1da177e4 | 3171 | .resize = raid1_resize, |
80c3a6ce | 3172 | .size = raid1_size, |
63c70c4f | 3173 | .check_reshape = raid1_reshape, |
36fa3063 | 3174 | .quiesce = raid1_quiesce, |
709ae487 | 3175 | .takeover = raid1_takeover, |
5c675f83 | 3176 | .congested = raid1_congested, |
1da177e4 LT |
3177 | }; |
3178 | ||
3179 | static int __init raid_init(void) | |
3180 | { | |
2604b703 | 3181 | return register_md_personality(&raid1_personality); |
1da177e4 LT |
3182 | } |
3183 | ||
3184 | static void raid_exit(void) | |
3185 | { | |
2604b703 | 3186 | unregister_md_personality(&raid1_personality); |
1da177e4 LT |
3187 | } |
3188 | ||
3189 | module_init(raid_init); | |
3190 | module_exit(raid_exit); | |
3191 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 3192 | MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); |
1da177e4 | 3193 | MODULE_ALIAS("md-personality-3"); /* RAID1 */ |
d9d166c2 | 3194 | MODULE_ALIAS("md-raid1"); |
2604b703 | 3195 | MODULE_ALIAS("md-level-1"); |
34db0cd6 N |
3196 | |
3197 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |