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1da177e4 LT |
1 | /* |
2 | * raid10.c : Multiple Devices driver for Linux | |
3 | * | |
4 | * Copyright (C) 2000-2004 Neil Brown | |
5 | * | |
6 | * RAID-10 support for md. | |
7 | * | |
25985edc | 8 | * Base on code in raid1.c. See raid1.c for further copyright information. |
1da177e4 LT |
9 | * |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * (for example /usr/src/linux/COPYING); if not, write to the Free | |
18 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
5a0e3ad6 | 21 | #include <linux/slab.h> |
25570727 | 22 | #include <linux/delay.h> |
bff61975 | 23 | #include <linux/blkdev.h> |
056075c7 | 24 | #include <linux/module.h> |
bff61975 | 25 | #include <linux/seq_file.h> |
8bda470e | 26 | #include <linux/ratelimit.h> |
3ea7daa5 | 27 | #include <linux/kthread.h> |
109e3765 | 28 | #include <trace/events/block.h> |
43b2e5d8 | 29 | #include "md.h" |
ef740c37 | 30 | #include "raid10.h" |
dab8b292 | 31 | #include "raid0.h" |
ef740c37 | 32 | #include "bitmap.h" |
1da177e4 LT |
33 | |
34 | /* | |
35 | * RAID10 provides a combination of RAID0 and RAID1 functionality. | |
36 | * The layout of data is defined by | |
37 | * chunk_size | |
38 | * raid_disks | |
39 | * near_copies (stored in low byte of layout) | |
40 | * far_copies (stored in second byte of layout) | |
c93983bf | 41 | * far_offset (stored in bit 16 of layout ) |
475901af | 42 | * use_far_sets (stored in bit 17 of layout ) |
8bce6d35 | 43 | * use_far_sets_bugfixed (stored in bit 18 of layout ) |
1da177e4 | 44 | * |
475901af JB |
45 | * The data to be stored is divided into chunks using chunksize. Each device |
46 | * is divided into far_copies sections. In each section, chunks are laid out | |
47 | * in a style similar to raid0, but near_copies copies of each chunk is stored | |
48 | * (each on a different drive). The starting device for each section is offset | |
49 | * near_copies from the starting device of the previous section. Thus there | |
50 | * are (near_copies * far_copies) of each chunk, and each is on a different | |
51 | * drive. near_copies and far_copies must be at least one, and their product | |
52 | * is at most raid_disks. | |
c93983bf N |
53 | * |
54 | * If far_offset is true, then the far_copies are handled a bit differently. | |
475901af JB |
55 | * The copies are still in different stripes, but instead of being very far |
56 | * apart on disk, there are adjacent stripes. | |
57 | * | |
58 | * The far and offset algorithms are handled slightly differently if | |
59 | * 'use_far_sets' is true. In this case, the array's devices are grouped into | |
60 | * sets that are (near_copies * far_copies) in size. The far copied stripes | |
61 | * are still shifted by 'near_copies' devices, but this shifting stays confined | |
62 | * to the set rather than the entire array. This is done to improve the number | |
63 | * of device combinations that can fail without causing the array to fail. | |
64 | * Example 'far' algorithm w/o 'use_far_sets' (each letter represents a chunk | |
65 | * on a device): | |
66 | * A B C D A B C D E | |
67 | * ... ... | |
68 | * D A B C E A B C D | |
69 | * Example 'far' algorithm w/ 'use_far_sets' enabled (sets illustrated w/ []'s): | |
70 | * [A B] [C D] [A B] [C D E] | |
71 | * |...| |...| |...| | ... | | |
72 | * [B A] [D C] [B A] [E C D] | |
1da177e4 LT |
73 | */ |
74 | ||
75 | /* | |
76 | * Number of guaranteed r10bios in case of extreme VM load: | |
77 | */ | |
78 | #define NR_RAID10_BIOS 256 | |
79 | ||
473e87ce JB |
80 | /* when we get a read error on a read-only array, we redirect to another |
81 | * device without failing the first device, or trying to over-write to | |
82 | * correct the read error. To keep track of bad blocks on a per-bio | |
83 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
84 | */ | |
85 | #define IO_BLOCKED ((struct bio *)1) | |
86 | /* When we successfully write to a known bad-block, we need to remove the | |
87 | * bad-block marking which must be done from process context. So we record | |
88 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
89 | */ | |
90 | #define IO_MADE_GOOD ((struct bio *)2) | |
91 | ||
92 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
93 | ||
94 | /* When there are this many requests queued to be written by | |
34db0cd6 N |
95 | * the raid10 thread, we become 'congested' to provide back-pressure |
96 | * for writeback. | |
97 | */ | |
98 | static int max_queued_requests = 1024; | |
99 | ||
e879a879 N |
100 | static void allow_barrier(struct r10conf *conf); |
101 | static void lower_barrier(struct r10conf *conf); | |
635f6416 | 102 | static int _enough(struct r10conf *conf, int previous, int ignore); |
1919cbb2 | 103 | static int enough(struct r10conf *conf, int ignore); |
3ea7daa5 N |
104 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, |
105 | int *skipped); | |
106 | static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio); | |
4246a0b6 | 107 | static void end_reshape_write(struct bio *bio); |
3ea7daa5 | 108 | static void end_reshape(struct r10conf *conf); |
0a27ec96 | 109 | |
578b54ad N |
110 | #define raid10_log(md, fmt, args...) \ |
111 | do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid10 " fmt, ##args); } while (0) | |
112 | ||
fb0eb5df ML |
113 | #include "raid1-10.c" |
114 | ||
f0250618 ML |
115 | /* |
116 | * for resync bio, r10bio pointer can be retrieved from the per-bio | |
117 | * 'struct resync_pages'. | |
118 | */ | |
119 | static inline struct r10bio *get_resync_r10bio(struct bio *bio) | |
120 | { | |
121 | return get_resync_pages(bio)->raid_bio; | |
122 | } | |
123 | ||
dd0fc66f | 124 | static void * r10bio_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 125 | { |
e879a879 | 126 | struct r10conf *conf = data; |
9f2c9d12 | 127 | int size = offsetof(struct r10bio, devs[conf->copies]); |
1da177e4 | 128 | |
69335ef3 N |
129 | /* allocate a r10bio with room for raid_disks entries in the |
130 | * bios array */ | |
7eaceacc | 131 | return kzalloc(size, gfp_flags); |
1da177e4 LT |
132 | } |
133 | ||
134 | static void r10bio_pool_free(void *r10_bio, void *data) | |
135 | { | |
136 | kfree(r10_bio); | |
137 | } | |
138 | ||
0310fa21 N |
139 | /* amount of memory to reserve for resync requests */ |
140 | #define RESYNC_WINDOW (1024*1024) | |
141 | /* maximum number of concurrent requests, memory permitting */ | |
142 | #define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE) | |
1da177e4 LT |
143 | |
144 | /* | |
145 | * When performing a resync, we need to read and compare, so | |
146 | * we need as many pages are there are copies. | |
147 | * When performing a recovery, we need 2 bios, one for read, | |
148 | * one for write (we recover only one drive per r10buf) | |
149 | * | |
150 | */ | |
dd0fc66f | 151 | static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) |
1da177e4 | 152 | { |
e879a879 | 153 | struct r10conf *conf = data; |
9f2c9d12 | 154 | struct r10bio *r10_bio; |
1da177e4 | 155 | struct bio *bio; |
f0250618 ML |
156 | int j; |
157 | int nalloc, nalloc_rp; | |
158 | struct resync_pages *rps; | |
1da177e4 LT |
159 | |
160 | r10_bio = r10bio_pool_alloc(gfp_flags, conf); | |
7eaceacc | 161 | if (!r10_bio) |
1da177e4 | 162 | return NULL; |
1da177e4 | 163 | |
3ea7daa5 N |
164 | if (test_bit(MD_RECOVERY_SYNC, &conf->mddev->recovery) || |
165 | test_bit(MD_RECOVERY_RESHAPE, &conf->mddev->recovery)) | |
1da177e4 LT |
166 | nalloc = conf->copies; /* resync */ |
167 | else | |
168 | nalloc = 2; /* recovery */ | |
169 | ||
f0250618 ML |
170 | /* allocate once for all bios */ |
171 | if (!conf->have_replacement) | |
172 | nalloc_rp = nalloc; | |
173 | else | |
174 | nalloc_rp = nalloc * 2; | |
175 | rps = kmalloc(sizeof(struct resync_pages) * nalloc_rp, gfp_flags); | |
176 | if (!rps) | |
177 | goto out_free_r10bio; | |
178 | ||
1da177e4 LT |
179 | /* |
180 | * Allocate bios. | |
181 | */ | |
182 | for (j = nalloc ; j-- ; ) { | |
6746557f | 183 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); |
1da177e4 LT |
184 | if (!bio) |
185 | goto out_free_bio; | |
186 | r10_bio->devs[j].bio = bio; | |
69335ef3 N |
187 | if (!conf->have_replacement) |
188 | continue; | |
189 | bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); | |
190 | if (!bio) | |
191 | goto out_free_bio; | |
192 | r10_bio->devs[j].repl_bio = bio; | |
1da177e4 LT |
193 | } |
194 | /* | |
195 | * Allocate RESYNC_PAGES data pages and attach them | |
196 | * where needed. | |
197 | */ | |
f0250618 | 198 | for (j = 0; j < nalloc; j++) { |
69335ef3 | 199 | struct bio *rbio = r10_bio->devs[j].repl_bio; |
f0250618 ML |
200 | struct resync_pages *rp, *rp_repl; |
201 | ||
202 | rp = &rps[j]; | |
203 | if (rbio) | |
204 | rp_repl = &rps[nalloc + j]; | |
205 | ||
1da177e4 | 206 | bio = r10_bio->devs[j].bio; |
f0250618 ML |
207 | |
208 | if (!j || test_bit(MD_RECOVERY_SYNC, | |
209 | &conf->mddev->recovery)) { | |
210 | if (resync_alloc_pages(rp, gfp_flags)) | |
1da177e4 | 211 | goto out_free_pages; |
f0250618 ML |
212 | } else { |
213 | memcpy(rp, &rps[0], sizeof(*rp)); | |
214 | resync_get_all_pages(rp); | |
215 | } | |
1da177e4 | 216 | |
f0250618 ML |
217 | rp->raid_bio = r10_bio; |
218 | bio->bi_private = rp; | |
219 | if (rbio) { | |
220 | memcpy(rp_repl, rp, sizeof(*rp)); | |
221 | rbio->bi_private = rp_repl; | |
1da177e4 LT |
222 | } |
223 | } | |
224 | ||
225 | return r10_bio; | |
226 | ||
227 | out_free_pages: | |
f0250618 ML |
228 | while (--j >= 0) |
229 | resync_free_pages(&rps[j * 2]); | |
230 | ||
5fdd2cf8 | 231 | j = 0; |
1da177e4 | 232 | out_free_bio: |
5fdd2cf8 | 233 | for ( ; j < nalloc; j++) { |
234 | if (r10_bio->devs[j].bio) | |
235 | bio_put(r10_bio->devs[j].bio); | |
69335ef3 N |
236 | if (r10_bio->devs[j].repl_bio) |
237 | bio_put(r10_bio->devs[j].repl_bio); | |
238 | } | |
f0250618 ML |
239 | kfree(rps); |
240 | out_free_r10bio: | |
1da177e4 LT |
241 | r10bio_pool_free(r10_bio, conf); |
242 | return NULL; | |
243 | } | |
244 | ||
245 | static void r10buf_pool_free(void *__r10_bio, void *data) | |
246 | { | |
e879a879 | 247 | struct r10conf *conf = data; |
9f2c9d12 | 248 | struct r10bio *r10bio = __r10_bio; |
1da177e4 | 249 | int j; |
f0250618 | 250 | struct resync_pages *rp = NULL; |
1da177e4 | 251 | |
f0250618 | 252 | for (j = conf->copies; j--; ) { |
1da177e4 | 253 | struct bio *bio = r10bio->devs[j].bio; |
f0250618 ML |
254 | |
255 | rp = get_resync_pages(bio); | |
256 | resync_free_pages(rp); | |
257 | bio_put(bio); | |
258 | ||
69335ef3 N |
259 | bio = r10bio->devs[j].repl_bio; |
260 | if (bio) | |
261 | bio_put(bio); | |
1da177e4 | 262 | } |
f0250618 ML |
263 | |
264 | /* resync pages array stored in the 1st bio's .bi_private */ | |
265 | kfree(rp); | |
266 | ||
1da177e4 LT |
267 | r10bio_pool_free(r10bio, conf); |
268 | } | |
269 | ||
e879a879 | 270 | static void put_all_bios(struct r10conf *conf, struct r10bio *r10_bio) |
1da177e4 LT |
271 | { |
272 | int i; | |
273 | ||
274 | for (i = 0; i < conf->copies; i++) { | |
275 | struct bio **bio = & r10_bio->devs[i].bio; | |
749c55e9 | 276 | if (!BIO_SPECIAL(*bio)) |
1da177e4 LT |
277 | bio_put(*bio); |
278 | *bio = NULL; | |
69335ef3 N |
279 | bio = &r10_bio->devs[i].repl_bio; |
280 | if (r10_bio->read_slot < 0 && !BIO_SPECIAL(*bio)) | |
281 | bio_put(*bio); | |
282 | *bio = NULL; | |
1da177e4 LT |
283 | } |
284 | } | |
285 | ||
9f2c9d12 | 286 | static void free_r10bio(struct r10bio *r10_bio) |
1da177e4 | 287 | { |
e879a879 | 288 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 289 | |
1da177e4 LT |
290 | put_all_bios(conf, r10_bio); |
291 | mempool_free(r10_bio, conf->r10bio_pool); | |
292 | } | |
293 | ||
9f2c9d12 | 294 | static void put_buf(struct r10bio *r10_bio) |
1da177e4 | 295 | { |
e879a879 | 296 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
297 | |
298 | mempool_free(r10_bio, conf->r10buf_pool); | |
299 | ||
0a27ec96 | 300 | lower_barrier(conf); |
1da177e4 LT |
301 | } |
302 | ||
9f2c9d12 | 303 | static void reschedule_retry(struct r10bio *r10_bio) |
1da177e4 LT |
304 | { |
305 | unsigned long flags; | |
fd01b88c | 306 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 307 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
308 | |
309 | spin_lock_irqsave(&conf->device_lock, flags); | |
310 | list_add(&r10_bio->retry_list, &conf->retry_list); | |
4443ae10 | 311 | conf->nr_queued ++; |
1da177e4 LT |
312 | spin_unlock_irqrestore(&conf->device_lock, flags); |
313 | ||
388667be AJ |
314 | /* wake up frozen array... */ |
315 | wake_up(&conf->wait_barrier); | |
316 | ||
1da177e4 LT |
317 | md_wakeup_thread(mddev->thread); |
318 | } | |
319 | ||
320 | /* | |
321 | * raid_end_bio_io() is called when we have finished servicing a mirrored | |
322 | * operation and are ready to return a success/failure code to the buffer | |
323 | * cache layer. | |
324 | */ | |
9f2c9d12 | 325 | static void raid_end_bio_io(struct r10bio *r10_bio) |
1da177e4 LT |
326 | { |
327 | struct bio *bio = r10_bio->master_bio; | |
e879a879 | 328 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 329 | |
856e08e2 | 330 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) |
4e4cbee9 | 331 | bio->bi_status = BLK_STS_IOERR; |
fd16f2e8 N |
332 | |
333 | bio_endio(bio); | |
334 | /* | |
335 | * Wake up any possible resync thread that waits for the device | |
336 | * to go idle. | |
337 | */ | |
338 | allow_barrier(conf); | |
339 | ||
1da177e4 LT |
340 | free_r10bio(r10_bio); |
341 | } | |
342 | ||
343 | /* | |
344 | * Update disk head position estimator based on IRQ completion info. | |
345 | */ | |
9f2c9d12 | 346 | static inline void update_head_pos(int slot, struct r10bio *r10_bio) |
1da177e4 | 347 | { |
e879a879 | 348 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 LT |
349 | |
350 | conf->mirrors[r10_bio->devs[slot].devnum].head_position = | |
351 | r10_bio->devs[slot].addr + (r10_bio->sectors); | |
352 | } | |
353 | ||
778ca018 NK |
354 | /* |
355 | * Find the disk number which triggered given bio | |
356 | */ | |
e879a879 | 357 | static int find_bio_disk(struct r10conf *conf, struct r10bio *r10_bio, |
69335ef3 | 358 | struct bio *bio, int *slotp, int *replp) |
778ca018 NK |
359 | { |
360 | int slot; | |
69335ef3 | 361 | int repl = 0; |
778ca018 | 362 | |
69335ef3 | 363 | for (slot = 0; slot < conf->copies; slot++) { |
778ca018 NK |
364 | if (r10_bio->devs[slot].bio == bio) |
365 | break; | |
69335ef3 N |
366 | if (r10_bio->devs[slot].repl_bio == bio) { |
367 | repl = 1; | |
368 | break; | |
369 | } | |
370 | } | |
778ca018 NK |
371 | |
372 | BUG_ON(slot == conf->copies); | |
373 | update_head_pos(slot, r10_bio); | |
374 | ||
749c55e9 N |
375 | if (slotp) |
376 | *slotp = slot; | |
69335ef3 N |
377 | if (replp) |
378 | *replp = repl; | |
778ca018 NK |
379 | return r10_bio->devs[slot].devnum; |
380 | } | |
381 | ||
4246a0b6 | 382 | static void raid10_end_read_request(struct bio *bio) |
1da177e4 | 383 | { |
4e4cbee9 | 384 | int uptodate = !bio->bi_status; |
9f2c9d12 | 385 | struct r10bio *r10_bio = bio->bi_private; |
1da177e4 | 386 | int slot, dev; |
abbf098e | 387 | struct md_rdev *rdev; |
e879a879 | 388 | struct r10conf *conf = r10_bio->mddev->private; |
1da177e4 | 389 | |
1da177e4 LT |
390 | slot = r10_bio->read_slot; |
391 | dev = r10_bio->devs[slot].devnum; | |
abbf098e | 392 | rdev = r10_bio->devs[slot].rdev; |
1da177e4 LT |
393 | /* |
394 | * this branch is our 'one mirror IO has finished' event handler: | |
395 | */ | |
4443ae10 N |
396 | update_head_pos(slot, r10_bio); |
397 | ||
398 | if (uptodate) { | |
1da177e4 LT |
399 | /* |
400 | * Set R10BIO_Uptodate in our master bio, so that | |
401 | * we will return a good error code to the higher | |
402 | * levels even if IO on some other mirrored buffer fails. | |
403 | * | |
404 | * The 'master' represents the composite IO operation to | |
405 | * user-side. So if something waits for IO, then it will | |
406 | * wait for the 'master' bio. | |
407 | */ | |
408 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
fae8cc5e N |
409 | } else { |
410 | /* If all other devices that store this block have | |
411 | * failed, we want to return the error upwards rather | |
412 | * than fail the last device. Here we redefine | |
413 | * "uptodate" to mean "Don't want to retry" | |
414 | */ | |
635f6416 N |
415 | if (!_enough(conf, test_bit(R10BIO_Previous, &r10_bio->state), |
416 | rdev->raid_disk)) | |
fae8cc5e | 417 | uptodate = 1; |
fae8cc5e N |
418 | } |
419 | if (uptodate) { | |
1da177e4 | 420 | raid_end_bio_io(r10_bio); |
abbf098e | 421 | rdev_dec_pending(rdev, conf->mddev); |
4443ae10 | 422 | } else { |
1da177e4 | 423 | /* |
7c4e06ff | 424 | * oops, read error - keep the refcount on the rdev |
1da177e4 LT |
425 | */ |
426 | char b[BDEVNAME_SIZE]; | |
08464e09 | 427 | pr_err_ratelimited("md/raid10:%s: %s: rescheduling sector %llu\n", |
8bda470e | 428 | mdname(conf->mddev), |
abbf098e | 429 | bdevname(rdev->bdev, b), |
8bda470e | 430 | (unsigned long long)r10_bio->sector); |
856e08e2 | 431 | set_bit(R10BIO_ReadError, &r10_bio->state); |
1da177e4 LT |
432 | reschedule_retry(r10_bio); |
433 | } | |
1da177e4 LT |
434 | } |
435 | ||
9f2c9d12 | 436 | static void close_write(struct r10bio *r10_bio) |
bd870a16 N |
437 | { |
438 | /* clear the bitmap if all writes complete successfully */ | |
439 | bitmap_endwrite(r10_bio->mddev->bitmap, r10_bio->sector, | |
440 | r10_bio->sectors, | |
441 | !test_bit(R10BIO_Degraded, &r10_bio->state), | |
442 | 0); | |
443 | md_write_end(r10_bio->mddev); | |
444 | } | |
445 | ||
9f2c9d12 | 446 | static void one_write_done(struct r10bio *r10_bio) |
19d5f834 N |
447 | { |
448 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
449 | if (test_bit(R10BIO_WriteError, &r10_bio->state)) | |
450 | reschedule_retry(r10_bio); | |
451 | else { | |
452 | close_write(r10_bio); | |
453 | if (test_bit(R10BIO_MadeGood, &r10_bio->state)) | |
454 | reschedule_retry(r10_bio); | |
455 | else | |
456 | raid_end_bio_io(r10_bio); | |
457 | } | |
458 | } | |
459 | } | |
460 | ||
4246a0b6 | 461 | static void raid10_end_write_request(struct bio *bio) |
1da177e4 | 462 | { |
9f2c9d12 | 463 | struct r10bio *r10_bio = bio->bi_private; |
778ca018 | 464 | int dev; |
749c55e9 | 465 | int dec_rdev = 1; |
e879a879 | 466 | struct r10conf *conf = r10_bio->mddev->private; |
475b0321 | 467 | int slot, repl; |
4ca40c2c | 468 | struct md_rdev *rdev = NULL; |
1919cbb2 | 469 | struct bio *to_put = NULL; |
579ed34f SL |
470 | bool discard_error; |
471 | ||
4e4cbee9 | 472 | discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; |
1da177e4 | 473 | |
475b0321 | 474 | dev = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
1da177e4 | 475 | |
475b0321 N |
476 | if (repl) |
477 | rdev = conf->mirrors[dev].replacement; | |
4ca40c2c N |
478 | if (!rdev) { |
479 | smp_rmb(); | |
480 | repl = 0; | |
475b0321 | 481 | rdev = conf->mirrors[dev].rdev; |
4ca40c2c | 482 | } |
1da177e4 LT |
483 | /* |
484 | * this branch is our 'one mirror IO has finished' event handler: | |
485 | */ | |
4e4cbee9 | 486 | if (bio->bi_status && !discard_error) { |
475b0321 N |
487 | if (repl) |
488 | /* Never record new bad blocks to replacement, | |
489 | * just fail it. | |
490 | */ | |
491 | md_error(rdev->mddev, rdev); | |
492 | else { | |
493 | set_bit(WriteErrorSeen, &rdev->flags); | |
b7044d41 N |
494 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
495 | set_bit(MD_RECOVERY_NEEDED, | |
496 | &rdev->mddev->recovery); | |
1919cbb2 | 497 | |
475b0321 | 498 | dec_rdev = 0; |
1919cbb2 N |
499 | if (test_bit(FailFast, &rdev->flags) && |
500 | (bio->bi_opf & MD_FAILFAST)) { | |
501 | md_error(rdev->mddev, rdev); | |
502 | if (!test_bit(Faulty, &rdev->flags)) | |
503 | /* This is the only remaining device, | |
504 | * We need to retry the write without | |
505 | * FailFast | |
506 | */ | |
507 | set_bit(R10BIO_WriteError, &r10_bio->state); | |
508 | else { | |
509 | r10_bio->devs[slot].bio = NULL; | |
510 | to_put = bio; | |
511 | dec_rdev = 1; | |
512 | } | |
513 | } else | |
514 | set_bit(R10BIO_WriteError, &r10_bio->state); | |
475b0321 | 515 | } |
749c55e9 | 516 | } else { |
1da177e4 LT |
517 | /* |
518 | * Set R10BIO_Uptodate in our master bio, so that | |
519 | * we will return a good error code for to the higher | |
520 | * levels even if IO on some other mirrored buffer fails. | |
521 | * | |
522 | * The 'master' represents the composite IO operation to | |
523 | * user-side. So if something waits for IO, then it will | |
524 | * wait for the 'master' bio. | |
525 | */ | |
749c55e9 N |
526 | sector_t first_bad; |
527 | int bad_sectors; | |
528 | ||
3056e3ae AL |
529 | /* |
530 | * Do not set R10BIO_Uptodate if the current device is | |
531 | * rebuilding or Faulty. This is because we cannot use | |
532 | * such device for properly reading the data back (we could | |
533 | * potentially use it, if the current write would have felt | |
534 | * before rdev->recovery_offset, but for simplicity we don't | |
535 | * check this here. | |
536 | */ | |
537 | if (test_bit(In_sync, &rdev->flags) && | |
538 | !test_bit(Faulty, &rdev->flags)) | |
539 | set_bit(R10BIO_Uptodate, &r10_bio->state); | |
1da177e4 | 540 | |
749c55e9 | 541 | /* Maybe we can clear some bad blocks. */ |
475b0321 | 542 | if (is_badblock(rdev, |
749c55e9 N |
543 | r10_bio->devs[slot].addr, |
544 | r10_bio->sectors, | |
579ed34f | 545 | &first_bad, &bad_sectors) && !discard_error) { |
749c55e9 | 546 | bio_put(bio); |
475b0321 N |
547 | if (repl) |
548 | r10_bio->devs[slot].repl_bio = IO_MADE_GOOD; | |
549 | else | |
550 | r10_bio->devs[slot].bio = IO_MADE_GOOD; | |
749c55e9 N |
551 | dec_rdev = 0; |
552 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
553 | } | |
554 | } | |
555 | ||
1da177e4 LT |
556 | /* |
557 | * | |
558 | * Let's see if all mirrored write operations have finished | |
559 | * already. | |
560 | */ | |
19d5f834 | 561 | one_write_done(r10_bio); |
749c55e9 | 562 | if (dec_rdev) |
884162df | 563 | rdev_dec_pending(rdev, conf->mddev); |
1919cbb2 N |
564 | if (to_put) |
565 | bio_put(to_put); | |
1da177e4 LT |
566 | } |
567 | ||
1da177e4 LT |
568 | /* |
569 | * RAID10 layout manager | |
25985edc | 570 | * As well as the chunksize and raid_disks count, there are two |
1da177e4 LT |
571 | * parameters: near_copies and far_copies. |
572 | * near_copies * far_copies must be <= raid_disks. | |
573 | * Normally one of these will be 1. | |
574 | * If both are 1, we get raid0. | |
575 | * If near_copies == raid_disks, we get raid1. | |
576 | * | |
25985edc | 577 | * Chunks are laid out in raid0 style with near_copies copies of the |
1da177e4 LT |
578 | * first chunk, followed by near_copies copies of the next chunk and |
579 | * so on. | |
580 | * If far_copies > 1, then after 1/far_copies of the array has been assigned | |
581 | * as described above, we start again with a device offset of near_copies. | |
582 | * So we effectively have another copy of the whole array further down all | |
583 | * the drives, but with blocks on different drives. | |
584 | * With this layout, and block is never stored twice on the one device. | |
585 | * | |
586 | * raid10_find_phys finds the sector offset of a given virtual sector | |
c93983bf | 587 | * on each device that it is on. |
1da177e4 LT |
588 | * |
589 | * raid10_find_virt does the reverse mapping, from a device and a | |
590 | * sector offset to a virtual address | |
591 | */ | |
592 | ||
f8c9e74f | 593 | static void __raid10_find_phys(struct geom *geo, struct r10bio *r10bio) |
1da177e4 LT |
594 | { |
595 | int n,f; | |
596 | sector_t sector; | |
597 | sector_t chunk; | |
598 | sector_t stripe; | |
599 | int dev; | |
1da177e4 | 600 | int slot = 0; |
9a3152ab JB |
601 | int last_far_set_start, last_far_set_size; |
602 | ||
603 | last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; | |
604 | last_far_set_start *= geo->far_set_size; | |
605 | ||
606 | last_far_set_size = geo->far_set_size; | |
607 | last_far_set_size += (geo->raid_disks % geo->far_set_size); | |
1da177e4 LT |
608 | |
609 | /* now calculate first sector/dev */ | |
5cf00fcd N |
610 | chunk = r10bio->sector >> geo->chunk_shift; |
611 | sector = r10bio->sector & geo->chunk_mask; | |
1da177e4 | 612 | |
5cf00fcd | 613 | chunk *= geo->near_copies; |
1da177e4 | 614 | stripe = chunk; |
5cf00fcd N |
615 | dev = sector_div(stripe, geo->raid_disks); |
616 | if (geo->far_offset) | |
617 | stripe *= geo->far_copies; | |
1da177e4 | 618 | |
5cf00fcd | 619 | sector += stripe << geo->chunk_shift; |
1da177e4 LT |
620 | |
621 | /* and calculate all the others */ | |
5cf00fcd | 622 | for (n = 0; n < geo->near_copies; n++) { |
1da177e4 | 623 | int d = dev; |
475901af | 624 | int set; |
1da177e4 | 625 | sector_t s = sector; |
1da177e4 | 626 | r10bio->devs[slot].devnum = d; |
4c0ca26b | 627 | r10bio->devs[slot].addr = s; |
1da177e4 LT |
628 | slot++; |
629 | ||
5cf00fcd | 630 | for (f = 1; f < geo->far_copies; f++) { |
475901af | 631 | set = d / geo->far_set_size; |
5cf00fcd | 632 | d += geo->near_copies; |
475901af | 633 | |
9a3152ab JB |
634 | if ((geo->raid_disks % geo->far_set_size) && |
635 | (d > last_far_set_start)) { | |
636 | d -= last_far_set_start; | |
637 | d %= last_far_set_size; | |
638 | d += last_far_set_start; | |
639 | } else { | |
640 | d %= geo->far_set_size; | |
641 | d += geo->far_set_size * set; | |
642 | } | |
5cf00fcd | 643 | s += geo->stride; |
1da177e4 LT |
644 | r10bio->devs[slot].devnum = d; |
645 | r10bio->devs[slot].addr = s; | |
646 | slot++; | |
647 | } | |
648 | dev++; | |
5cf00fcd | 649 | if (dev >= geo->raid_disks) { |
1da177e4 | 650 | dev = 0; |
5cf00fcd | 651 | sector += (geo->chunk_mask + 1); |
1da177e4 LT |
652 | } |
653 | } | |
f8c9e74f N |
654 | } |
655 | ||
656 | static void raid10_find_phys(struct r10conf *conf, struct r10bio *r10bio) | |
657 | { | |
658 | struct geom *geo = &conf->geo; | |
659 | ||
660 | if (conf->reshape_progress != MaxSector && | |
661 | ((r10bio->sector >= conf->reshape_progress) != | |
662 | conf->mddev->reshape_backwards)) { | |
663 | set_bit(R10BIO_Previous, &r10bio->state); | |
664 | geo = &conf->prev; | |
665 | } else | |
666 | clear_bit(R10BIO_Previous, &r10bio->state); | |
667 | ||
668 | __raid10_find_phys(geo, r10bio); | |
1da177e4 LT |
669 | } |
670 | ||
e879a879 | 671 | static sector_t raid10_find_virt(struct r10conf *conf, sector_t sector, int dev) |
1da177e4 LT |
672 | { |
673 | sector_t offset, chunk, vchunk; | |
f8c9e74f N |
674 | /* Never use conf->prev as this is only called during resync |
675 | * or recovery, so reshape isn't happening | |
676 | */ | |
5cf00fcd | 677 | struct geom *geo = &conf->geo; |
475901af JB |
678 | int far_set_start = (dev / geo->far_set_size) * geo->far_set_size; |
679 | int far_set_size = geo->far_set_size; | |
9a3152ab JB |
680 | int last_far_set_start; |
681 | ||
682 | if (geo->raid_disks % geo->far_set_size) { | |
683 | last_far_set_start = (geo->raid_disks / geo->far_set_size) - 1; | |
684 | last_far_set_start *= geo->far_set_size; | |
685 | ||
686 | if (dev >= last_far_set_start) { | |
687 | far_set_size = geo->far_set_size; | |
688 | far_set_size += (geo->raid_disks % geo->far_set_size); | |
689 | far_set_start = last_far_set_start; | |
690 | } | |
691 | } | |
1da177e4 | 692 | |
5cf00fcd N |
693 | offset = sector & geo->chunk_mask; |
694 | if (geo->far_offset) { | |
c93983bf | 695 | int fc; |
5cf00fcd N |
696 | chunk = sector >> geo->chunk_shift; |
697 | fc = sector_div(chunk, geo->far_copies); | |
698 | dev -= fc * geo->near_copies; | |
475901af JB |
699 | if (dev < far_set_start) |
700 | dev += far_set_size; | |
c93983bf | 701 | } else { |
5cf00fcd N |
702 | while (sector >= geo->stride) { |
703 | sector -= geo->stride; | |
475901af JB |
704 | if (dev < (geo->near_copies + far_set_start)) |
705 | dev += far_set_size - geo->near_copies; | |
c93983bf | 706 | else |
5cf00fcd | 707 | dev -= geo->near_copies; |
c93983bf | 708 | } |
5cf00fcd | 709 | chunk = sector >> geo->chunk_shift; |
c93983bf | 710 | } |
5cf00fcd N |
711 | vchunk = chunk * geo->raid_disks + dev; |
712 | sector_div(vchunk, geo->near_copies); | |
713 | return (vchunk << geo->chunk_shift) + offset; | |
1da177e4 LT |
714 | } |
715 | ||
1da177e4 LT |
716 | /* |
717 | * This routine returns the disk from which the requested read should | |
718 | * be done. There is a per-array 'next expected sequential IO' sector | |
719 | * number - if this matches on the next IO then we use the last disk. | |
720 | * There is also a per-disk 'last know head position' sector that is | |
721 | * maintained from IRQ contexts, both the normal and the resync IO | |
722 | * completion handlers update this position correctly. If there is no | |
723 | * perfect sequential match then we pick the disk whose head is closest. | |
724 | * | |
725 | * If there are 2 mirrors in the same 2 devices, performance degrades | |
726 | * because position is mirror, not device based. | |
727 | * | |
728 | * The rdev for the device selected will have nr_pending incremented. | |
729 | */ | |
730 | ||
731 | /* | |
732 | * FIXME: possibly should rethink readbalancing and do it differently | |
733 | * depending on near_copies / far_copies geometry. | |
734 | */ | |
96c3fd1f N |
735 | static struct md_rdev *read_balance(struct r10conf *conf, |
736 | struct r10bio *r10_bio, | |
737 | int *max_sectors) | |
1da177e4 | 738 | { |
af3a2cd6 | 739 | const sector_t this_sector = r10_bio->sector; |
56d99121 | 740 | int disk, slot; |
856e08e2 N |
741 | int sectors = r10_bio->sectors; |
742 | int best_good_sectors; | |
56d99121 | 743 | sector_t new_distance, best_dist; |
3bbae04b | 744 | struct md_rdev *best_rdev, *rdev = NULL; |
56d99121 N |
745 | int do_balance; |
746 | int best_slot; | |
5cf00fcd | 747 | struct geom *geo = &conf->geo; |
1da177e4 LT |
748 | |
749 | raid10_find_phys(conf, r10_bio); | |
750 | rcu_read_lock(); | |
856e08e2 | 751 | sectors = r10_bio->sectors; |
56d99121 | 752 | best_slot = -1; |
abbf098e | 753 | best_rdev = NULL; |
56d99121 | 754 | best_dist = MaxSector; |
856e08e2 | 755 | best_good_sectors = 0; |
56d99121 | 756 | do_balance = 1; |
8d3ca83d | 757 | clear_bit(R10BIO_FailFast, &r10_bio->state); |
1da177e4 LT |
758 | /* |
759 | * Check if we can balance. We can balance on the whole | |
6cce3b23 N |
760 | * device if no resync is going on (recovery is ok), or below |
761 | * the resync window. We take the first readable disk when | |
762 | * above the resync window. | |
1da177e4 LT |
763 | */ |
764 | if (conf->mddev->recovery_cp < MaxSector | |
56d99121 N |
765 | && (this_sector + sectors >= conf->next_resync)) |
766 | do_balance = 0; | |
1da177e4 | 767 | |
56d99121 | 768 | for (slot = 0; slot < conf->copies ; slot++) { |
856e08e2 N |
769 | sector_t first_bad; |
770 | int bad_sectors; | |
771 | sector_t dev_sector; | |
772 | ||
56d99121 N |
773 | if (r10_bio->devs[slot].bio == IO_BLOCKED) |
774 | continue; | |
1da177e4 | 775 | disk = r10_bio->devs[slot].devnum; |
abbf098e N |
776 | rdev = rcu_dereference(conf->mirrors[disk].replacement); |
777 | if (rdev == NULL || test_bit(Faulty, &rdev->flags) || | |
778 | r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) | |
779 | rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
050b6615 | 780 | if (rdev == NULL || |
8ae12666 | 781 | test_bit(Faulty, &rdev->flags)) |
abbf098e N |
782 | continue; |
783 | if (!test_bit(In_sync, &rdev->flags) && | |
784 | r10_bio->devs[slot].addr + sectors > rdev->recovery_offset) | |
56d99121 N |
785 | continue; |
786 | ||
856e08e2 N |
787 | dev_sector = r10_bio->devs[slot].addr; |
788 | if (is_badblock(rdev, dev_sector, sectors, | |
789 | &first_bad, &bad_sectors)) { | |
790 | if (best_dist < MaxSector) | |
791 | /* Already have a better slot */ | |
792 | continue; | |
793 | if (first_bad <= dev_sector) { | |
794 | /* Cannot read here. If this is the | |
795 | * 'primary' device, then we must not read | |
796 | * beyond 'bad_sectors' from another device. | |
797 | */ | |
798 | bad_sectors -= (dev_sector - first_bad); | |
799 | if (!do_balance && sectors > bad_sectors) | |
800 | sectors = bad_sectors; | |
801 | if (best_good_sectors > sectors) | |
802 | best_good_sectors = sectors; | |
803 | } else { | |
804 | sector_t good_sectors = | |
805 | first_bad - dev_sector; | |
806 | if (good_sectors > best_good_sectors) { | |
807 | best_good_sectors = good_sectors; | |
808 | best_slot = slot; | |
abbf098e | 809 | best_rdev = rdev; |
856e08e2 N |
810 | } |
811 | if (!do_balance) | |
812 | /* Must read from here */ | |
813 | break; | |
814 | } | |
815 | continue; | |
816 | } else | |
817 | best_good_sectors = sectors; | |
818 | ||
56d99121 N |
819 | if (!do_balance) |
820 | break; | |
1da177e4 | 821 | |
8d3ca83d N |
822 | if (best_slot >= 0) |
823 | /* At least 2 disks to choose from so failfast is OK */ | |
824 | set_bit(R10BIO_FailFast, &r10_bio->state); | |
22dfdf52 N |
825 | /* This optimisation is debatable, and completely destroys |
826 | * sequential read speed for 'far copies' arrays. So only | |
827 | * keep it for 'near' arrays, and review those later. | |
828 | */ | |
5cf00fcd | 829 | if (geo->near_copies > 1 && !atomic_read(&rdev->nr_pending)) |
8d3ca83d | 830 | new_distance = 0; |
8ed3a195 KS |
831 | |
832 | /* for far > 1 always use the lowest address */ | |
8d3ca83d | 833 | else if (geo->far_copies > 1) |
56d99121 | 834 | new_distance = r10_bio->devs[slot].addr; |
8ed3a195 | 835 | else |
56d99121 N |
836 | new_distance = abs(r10_bio->devs[slot].addr - |
837 | conf->mirrors[disk].head_position); | |
838 | if (new_distance < best_dist) { | |
839 | best_dist = new_distance; | |
840 | best_slot = slot; | |
abbf098e | 841 | best_rdev = rdev; |
1da177e4 LT |
842 | } |
843 | } | |
abbf098e | 844 | if (slot >= conf->copies) { |
56d99121 | 845 | slot = best_slot; |
abbf098e N |
846 | rdev = best_rdev; |
847 | } | |
1da177e4 | 848 | |
56d99121 | 849 | if (slot >= 0) { |
56d99121 | 850 | atomic_inc(&rdev->nr_pending); |
56d99121 N |
851 | r10_bio->read_slot = slot; |
852 | } else | |
96c3fd1f | 853 | rdev = NULL; |
1da177e4 | 854 | rcu_read_unlock(); |
856e08e2 | 855 | *max_sectors = best_good_sectors; |
1da177e4 | 856 | |
96c3fd1f | 857 | return rdev; |
1da177e4 LT |
858 | } |
859 | ||
5c675f83 | 860 | static int raid10_congested(struct mddev *mddev, int bits) |
0d129228 | 861 | { |
e879a879 | 862 | struct r10conf *conf = mddev->private; |
0d129228 N |
863 | int i, ret = 0; |
864 | ||
4452226e | 865 | if ((bits & (1 << WB_async_congested)) && |
34db0cd6 N |
866 | conf->pending_count >= max_queued_requests) |
867 | return 1; | |
868 | ||
0d129228 | 869 | rcu_read_lock(); |
f8c9e74f N |
870 | for (i = 0; |
871 | (i < conf->geo.raid_disks || i < conf->prev.raid_disks) | |
872 | && ret == 0; | |
873 | i++) { | |
3cb03002 | 874 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); |
0d129228 | 875 | if (rdev && !test_bit(Faulty, &rdev->flags)) { |
165125e1 | 876 | struct request_queue *q = bdev_get_queue(rdev->bdev); |
0d129228 | 877 | |
dc3b17cc | 878 | ret |= bdi_congested(q->backing_dev_info, bits); |
0d129228 N |
879 | } |
880 | } | |
881 | rcu_read_unlock(); | |
882 | return ret; | |
883 | } | |
884 | ||
e879a879 | 885 | static void flush_pending_writes(struct r10conf *conf) |
a35e63ef N |
886 | { |
887 | /* Any writes that have been queued but are awaiting | |
888 | * bitmap updates get flushed here. | |
a35e63ef | 889 | */ |
a35e63ef N |
890 | spin_lock_irq(&conf->device_lock); |
891 | ||
892 | if (conf->pending_bio_list.head) { | |
893 | struct bio *bio; | |
894 | bio = bio_list_get(&conf->pending_bio_list); | |
34db0cd6 | 895 | conf->pending_count = 0; |
a35e63ef N |
896 | spin_unlock_irq(&conf->device_lock); |
897 | /* flush any pending bitmap writes to disk | |
898 | * before proceeding w/ I/O */ | |
899 | bitmap_unplug(conf->mddev->bitmap); | |
34db0cd6 | 900 | wake_up(&conf->wait_barrier); |
a35e63ef N |
901 | |
902 | while (bio) { /* submit pending writes */ | |
903 | struct bio *next = bio->bi_next; | |
a9ae93c8 | 904 | struct md_rdev *rdev = (void*)bio->bi_bdev; |
a35e63ef | 905 | bio->bi_next = NULL; |
a9ae93c8 N |
906 | bio->bi_bdev = rdev->bdev; |
907 | if (test_bit(Faulty, &rdev->flags)) { | |
6308d8e3 | 908 | bio_io_error(bio); |
a9ae93c8 N |
909 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
910 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
532a2a3f | 911 | /* Just ignore it */ |
4246a0b6 | 912 | bio_endio(bio); |
532a2a3f SL |
913 | else |
914 | generic_make_request(bio); | |
a35e63ef N |
915 | bio = next; |
916 | } | |
a35e63ef N |
917 | } else |
918 | spin_unlock_irq(&conf->device_lock); | |
a35e63ef | 919 | } |
7eaceacc | 920 | |
0a27ec96 N |
921 | /* Barriers.... |
922 | * Sometimes we need to suspend IO while we do something else, | |
923 | * either some resync/recovery, or reconfigure the array. | |
924 | * To do this we raise a 'barrier'. | |
925 | * The 'barrier' is a counter that can be raised multiple times | |
926 | * to count how many activities are happening which preclude | |
927 | * normal IO. | |
928 | * We can only raise the barrier if there is no pending IO. | |
929 | * i.e. if nr_pending == 0. | |
930 | * We choose only to raise the barrier if no-one is waiting for the | |
931 | * barrier to go down. This means that as soon as an IO request | |
932 | * is ready, no other operations which require a barrier will start | |
933 | * until the IO request has had a chance. | |
934 | * | |
935 | * So: regular IO calls 'wait_barrier'. When that returns there | |
936 | * is no backgroup IO happening, It must arrange to call | |
937 | * allow_barrier when it has finished its IO. | |
938 | * backgroup IO calls must call raise_barrier. Once that returns | |
939 | * there is no normal IO happeing. It must arrange to call | |
940 | * lower_barrier when the particular background IO completes. | |
1da177e4 | 941 | */ |
1da177e4 | 942 | |
e879a879 | 943 | static void raise_barrier(struct r10conf *conf, int force) |
1da177e4 | 944 | { |
6cce3b23 | 945 | BUG_ON(force && !conf->barrier); |
1da177e4 | 946 | spin_lock_irq(&conf->resync_lock); |
0a27ec96 | 947 | |
6cce3b23 N |
948 | /* Wait until no block IO is waiting (unless 'force') */ |
949 | wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting, | |
eed8c02e | 950 | conf->resync_lock); |
0a27ec96 N |
951 | |
952 | /* block any new IO from starting */ | |
953 | conf->barrier++; | |
954 | ||
c3b328ac | 955 | /* Now wait for all pending IO to complete */ |
0a27ec96 | 956 | wait_event_lock_irq(conf->wait_barrier, |
0e5313e2 | 957 | !atomic_read(&conf->nr_pending) && conf->barrier < RESYNC_DEPTH, |
eed8c02e | 958 | conf->resync_lock); |
0a27ec96 N |
959 | |
960 | spin_unlock_irq(&conf->resync_lock); | |
961 | } | |
962 | ||
e879a879 | 963 | static void lower_barrier(struct r10conf *conf) |
0a27ec96 N |
964 | { |
965 | unsigned long flags; | |
966 | spin_lock_irqsave(&conf->resync_lock, flags); | |
967 | conf->barrier--; | |
968 | spin_unlock_irqrestore(&conf->resync_lock, flags); | |
969 | wake_up(&conf->wait_barrier); | |
970 | } | |
971 | ||
e879a879 | 972 | static void wait_barrier(struct r10conf *conf) |
0a27ec96 N |
973 | { |
974 | spin_lock_irq(&conf->resync_lock); | |
975 | if (conf->barrier) { | |
976 | conf->nr_waiting++; | |
d6b42dcb N |
977 | /* Wait for the barrier to drop. |
978 | * However if there are already pending | |
979 | * requests (preventing the barrier from | |
980 | * rising completely), and the | |
981 | * pre-process bio queue isn't empty, | |
982 | * then don't wait, as we need to empty | |
983 | * that queue to get the nr_pending | |
984 | * count down. | |
985 | */ | |
578b54ad | 986 | raid10_log(conf->mddev, "wait barrier"); |
d6b42dcb N |
987 | wait_event_lock_irq(conf->wait_barrier, |
988 | !conf->barrier || | |
0e5313e2 | 989 | (atomic_read(&conf->nr_pending) && |
d6b42dcb | 990 | current->bio_list && |
f5fe1b51 N |
991 | (!bio_list_empty(¤t->bio_list[0]) || |
992 | !bio_list_empty(¤t->bio_list[1]))), | |
eed8c02e | 993 | conf->resync_lock); |
0a27ec96 | 994 | conf->nr_waiting--; |
0e5313e2 TM |
995 | if (!conf->nr_waiting) |
996 | wake_up(&conf->wait_barrier); | |
1da177e4 | 997 | } |
0e5313e2 | 998 | atomic_inc(&conf->nr_pending); |
1da177e4 LT |
999 | spin_unlock_irq(&conf->resync_lock); |
1000 | } | |
1001 | ||
e879a879 | 1002 | static void allow_barrier(struct r10conf *conf) |
0a27ec96 | 1003 | { |
0e5313e2 TM |
1004 | if ((atomic_dec_and_test(&conf->nr_pending)) || |
1005 | (conf->array_freeze_pending)) | |
1006 | wake_up(&conf->wait_barrier); | |
0a27ec96 N |
1007 | } |
1008 | ||
e2d59925 | 1009 | static void freeze_array(struct r10conf *conf, int extra) |
4443ae10 N |
1010 | { |
1011 | /* stop syncio and normal IO and wait for everything to | |
f188593e | 1012 | * go quiet. |
4443ae10 | 1013 | * We increment barrier and nr_waiting, and then |
e2d59925 | 1014 | * wait until nr_pending match nr_queued+extra |
1c830532 N |
1015 | * This is called in the context of one normal IO request |
1016 | * that has failed. Thus any sync request that might be pending | |
1017 | * will be blocked by nr_pending, and we need to wait for | |
1018 | * pending IO requests to complete or be queued for re-try. | |
e2d59925 | 1019 | * Thus the number queued (nr_queued) plus this request (extra) |
1c830532 N |
1020 | * must match the number of pending IOs (nr_pending) before |
1021 | * we continue. | |
4443ae10 N |
1022 | */ |
1023 | spin_lock_irq(&conf->resync_lock); | |
0e5313e2 | 1024 | conf->array_freeze_pending++; |
4443ae10 N |
1025 | conf->barrier++; |
1026 | conf->nr_waiting++; | |
eed8c02e | 1027 | wait_event_lock_irq_cmd(conf->wait_barrier, |
0e5313e2 | 1028 | atomic_read(&conf->nr_pending) == conf->nr_queued+extra, |
eed8c02e LC |
1029 | conf->resync_lock, |
1030 | flush_pending_writes(conf)); | |
c3b328ac | 1031 | |
0e5313e2 | 1032 | conf->array_freeze_pending--; |
4443ae10 N |
1033 | spin_unlock_irq(&conf->resync_lock); |
1034 | } | |
1035 | ||
e879a879 | 1036 | static void unfreeze_array(struct r10conf *conf) |
4443ae10 N |
1037 | { |
1038 | /* reverse the effect of the freeze */ | |
1039 | spin_lock_irq(&conf->resync_lock); | |
1040 | conf->barrier--; | |
1041 | conf->nr_waiting--; | |
1042 | wake_up(&conf->wait_barrier); | |
1043 | spin_unlock_irq(&conf->resync_lock); | |
1044 | } | |
1045 | ||
f8c9e74f N |
1046 | static sector_t choose_data_offset(struct r10bio *r10_bio, |
1047 | struct md_rdev *rdev) | |
1048 | { | |
1049 | if (!test_bit(MD_RECOVERY_RESHAPE, &rdev->mddev->recovery) || | |
1050 | test_bit(R10BIO_Previous, &r10_bio->state)) | |
1051 | return rdev->data_offset; | |
1052 | else | |
1053 | return rdev->new_data_offset; | |
1054 | } | |
1055 | ||
57c67df4 N |
1056 | struct raid10_plug_cb { |
1057 | struct blk_plug_cb cb; | |
1058 | struct bio_list pending; | |
1059 | int pending_cnt; | |
1060 | }; | |
1061 | ||
1062 | static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule) | |
1063 | { | |
1064 | struct raid10_plug_cb *plug = container_of(cb, struct raid10_plug_cb, | |
1065 | cb); | |
1066 | struct mddev *mddev = plug->cb.data; | |
1067 | struct r10conf *conf = mddev->private; | |
1068 | struct bio *bio; | |
1069 | ||
874807a8 | 1070 | if (from_schedule || current->bio_list) { |
57c67df4 N |
1071 | spin_lock_irq(&conf->device_lock); |
1072 | bio_list_merge(&conf->pending_bio_list, &plug->pending); | |
1073 | conf->pending_count += plug->pending_cnt; | |
1074 | spin_unlock_irq(&conf->device_lock); | |
ee0b0244 | 1075 | wake_up(&conf->wait_barrier); |
57c67df4 N |
1076 | md_wakeup_thread(mddev->thread); |
1077 | kfree(plug); | |
1078 | return; | |
1079 | } | |
1080 | ||
1081 | /* we aren't scheduling, so we can do the write-out directly. */ | |
1082 | bio = bio_list_get(&plug->pending); | |
1083 | bitmap_unplug(mddev->bitmap); | |
1084 | wake_up(&conf->wait_barrier); | |
1085 | ||
1086 | while (bio) { /* submit pending writes */ | |
1087 | struct bio *next = bio->bi_next; | |
a9ae93c8 | 1088 | struct md_rdev *rdev = (void*)bio->bi_bdev; |
57c67df4 | 1089 | bio->bi_next = NULL; |
a9ae93c8 N |
1090 | bio->bi_bdev = rdev->bdev; |
1091 | if (test_bit(Faulty, &rdev->flags)) { | |
6308d8e3 | 1092 | bio_io_error(bio); |
a9ae93c8 N |
1093 | } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && |
1094 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) | |
32f9f570 | 1095 | /* Just ignore it */ |
4246a0b6 | 1096 | bio_endio(bio); |
32f9f570 SL |
1097 | else |
1098 | generic_make_request(bio); | |
57c67df4 N |
1099 | bio = next; |
1100 | } | |
1101 | kfree(plug); | |
1102 | } | |
1103 | ||
bb5f1ed7 RL |
1104 | static void raid10_read_request(struct mddev *mddev, struct bio *bio, |
1105 | struct r10bio *r10_bio) | |
1da177e4 | 1106 | { |
e879a879 | 1107 | struct r10conf *conf = mddev->private; |
1da177e4 | 1108 | struct bio *read_bio; |
bb5f1ed7 RL |
1109 | const int op = bio_op(bio); |
1110 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); | |
bb5f1ed7 RL |
1111 | int max_sectors; |
1112 | sector_t sectors; | |
1113 | struct md_rdev *rdev; | |
545250f2 N |
1114 | char b[BDEVNAME_SIZE]; |
1115 | int slot = r10_bio->read_slot; | |
1116 | struct md_rdev *err_rdev = NULL; | |
1117 | gfp_t gfp = GFP_NOIO; | |
bb5f1ed7 | 1118 | |
545250f2 N |
1119 | if (r10_bio->devs[slot].rdev) { |
1120 | /* | |
1121 | * This is an error retry, but we cannot | |
1122 | * safely dereference the rdev in the r10_bio, | |
1123 | * we must use the one in conf. | |
1124 | * If it has already been disconnected (unlikely) | |
1125 | * we lose the device name in error messages. | |
1126 | */ | |
1127 | int disk; | |
1128 | /* | |
1129 | * As we are blocking raid10, it is a little safer to | |
1130 | * use __GFP_HIGH. | |
1131 | */ | |
1132 | gfp = GFP_NOIO | __GFP_HIGH; | |
1133 | ||
1134 | rcu_read_lock(); | |
1135 | disk = r10_bio->devs[slot].devnum; | |
1136 | err_rdev = rcu_dereference(conf->mirrors[disk].rdev); | |
1137 | if (err_rdev) | |
1138 | bdevname(err_rdev->bdev, b); | |
1139 | else { | |
1140 | strcpy(b, "???"); | |
1141 | /* This never gets dereferenced */ | |
1142 | err_rdev = r10_bio->devs[slot].rdev; | |
1143 | } | |
1144 | rcu_read_unlock(); | |
1145 | } | |
bb5f1ed7 RL |
1146 | /* |
1147 | * Register the new request and wait if the reconstruction | |
1148 | * thread has put up a bar for new requests. | |
1149 | * Continue immediately if no resync is active currently. | |
1150 | */ | |
1151 | wait_barrier(conf); | |
1152 | ||
fc9977dd | 1153 | sectors = r10_bio->sectors; |
bb5f1ed7 RL |
1154 | while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
1155 | bio->bi_iter.bi_sector < conf->reshape_progress && | |
1156 | bio->bi_iter.bi_sector + sectors > conf->reshape_progress) { | |
1157 | /* | |
1158 | * IO spans the reshape position. Need to wait for reshape to | |
1159 | * pass | |
1160 | */ | |
1161 | raid10_log(conf->mddev, "wait reshape"); | |
1162 | allow_barrier(conf); | |
1163 | wait_event(conf->wait_barrier, | |
1164 | conf->reshape_progress <= bio->bi_iter.bi_sector || | |
1165 | conf->reshape_progress >= bio->bi_iter.bi_sector + | |
1166 | sectors); | |
1167 | wait_barrier(conf); | |
1168 | } | |
1169 | ||
bb5f1ed7 RL |
1170 | rdev = read_balance(conf, r10_bio, &max_sectors); |
1171 | if (!rdev) { | |
545250f2 N |
1172 | if (err_rdev) { |
1173 | pr_crit_ratelimited("md/raid10:%s: %s: unrecoverable I/O read error for block %llu\n", | |
1174 | mdname(mddev), b, | |
1175 | (unsigned long long)r10_bio->sector); | |
1176 | } | |
bb5f1ed7 RL |
1177 | raid_end_bio_io(r10_bio); |
1178 | return; | |
1179 | } | |
545250f2 N |
1180 | if (err_rdev) |
1181 | pr_err_ratelimited("md/raid10:%s: %s: redirecting sector %llu to another mirror\n", | |
1182 | mdname(mddev), | |
1183 | bdevname(rdev->bdev, b), | |
1184 | (unsigned long long)r10_bio->sector); | |
fc9977dd N |
1185 | if (max_sectors < bio_sectors(bio)) { |
1186 | struct bio *split = bio_split(bio, max_sectors, | |
545250f2 | 1187 | gfp, conf->bio_split); |
fc9977dd N |
1188 | bio_chain(split, bio); |
1189 | generic_make_request(bio); | |
1190 | bio = split; | |
1191 | r10_bio->master_bio = bio; | |
1192 | r10_bio->sectors = max_sectors; | |
1193 | } | |
bb5f1ed7 RL |
1194 | slot = r10_bio->read_slot; |
1195 | ||
545250f2 | 1196 | read_bio = bio_clone_fast(bio, gfp, mddev->bio_set); |
bb5f1ed7 RL |
1197 | |
1198 | r10_bio->devs[slot].bio = read_bio; | |
1199 | r10_bio->devs[slot].rdev = rdev; | |
1200 | ||
1201 | read_bio->bi_iter.bi_sector = r10_bio->devs[slot].addr + | |
1202 | choose_data_offset(r10_bio, rdev); | |
1203 | read_bio->bi_bdev = rdev->bdev; | |
1204 | read_bio->bi_end_io = raid10_end_read_request; | |
1205 | bio_set_op_attrs(read_bio, op, do_sync); | |
1206 | if (test_bit(FailFast, &rdev->flags) && | |
1207 | test_bit(R10BIO_FailFast, &r10_bio->state)) | |
1208 | read_bio->bi_opf |= MD_FAILFAST; | |
1209 | read_bio->bi_private = r10_bio; | |
1210 | ||
1211 | if (mddev->gendisk) | |
1212 | trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), | |
1213 | read_bio, disk_devt(mddev->gendisk), | |
1214 | r10_bio->sector); | |
fc9977dd | 1215 | generic_make_request(read_bio); |
bb5f1ed7 RL |
1216 | return; |
1217 | } | |
1218 | ||
27f26a0f GJ |
1219 | static void raid10_write_one_disk(struct mddev *mddev, struct r10bio *r10_bio, |
1220 | struct bio *bio, bool replacement, | |
fc9977dd | 1221 | int n_copy) |
bb5f1ed7 | 1222 | { |
796a5cf0 | 1223 | const int op = bio_op(bio); |
1eff9d32 JA |
1224 | const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); |
1225 | const unsigned long do_fua = (bio->bi_opf & REQ_FUA); | |
6cce3b23 | 1226 | unsigned long flags; |
57c67df4 N |
1227 | struct blk_plug_cb *cb; |
1228 | struct raid10_plug_cb *plug = NULL; | |
27f26a0f GJ |
1229 | struct r10conf *conf = mddev->private; |
1230 | struct md_rdev *rdev; | |
1231 | int devnum = r10_bio->devs[n_copy].devnum; | |
1232 | struct bio *mbio; | |
1233 | ||
1234 | if (replacement) { | |
1235 | rdev = conf->mirrors[devnum].replacement; | |
1236 | if (rdev == NULL) { | |
1237 | /* Replacement just got moved to main 'rdev' */ | |
1238 | smp_mb(); | |
1239 | rdev = conf->mirrors[devnum].rdev; | |
1240 | } | |
1241 | } else | |
1242 | rdev = conf->mirrors[devnum].rdev; | |
1243 | ||
1244 | mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); | |
27f26a0f GJ |
1245 | if (replacement) |
1246 | r10_bio->devs[n_copy].repl_bio = mbio; | |
1247 | else | |
1248 | r10_bio->devs[n_copy].bio = mbio; | |
1249 | ||
1250 | mbio->bi_iter.bi_sector = (r10_bio->devs[n_copy].addr + | |
1251 | choose_data_offset(r10_bio, rdev)); | |
1252 | mbio->bi_bdev = rdev->bdev; | |
1253 | mbio->bi_end_io = raid10_end_write_request; | |
1254 | bio_set_op_attrs(mbio, op, do_sync | do_fua); | |
1255 | if (!replacement && test_bit(FailFast, | |
1256 | &conf->mirrors[devnum].rdev->flags) | |
1257 | && enough(conf, devnum)) | |
1258 | mbio->bi_opf |= MD_FAILFAST; | |
1259 | mbio->bi_private = r10_bio; | |
1260 | ||
1261 | if (conf->mddev->gendisk) | |
1262 | trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), | |
1263 | mbio, disk_devt(conf->mddev->gendisk), | |
1264 | r10_bio->sector); | |
1265 | /* flush_pending_writes() needs access to the rdev so...*/ | |
1266 | mbio->bi_bdev = (void *)rdev; | |
1267 | ||
1268 | atomic_inc(&r10_bio->remaining); | |
1269 | ||
1270 | cb = blk_check_plugged(raid10_unplug, mddev, sizeof(*plug)); | |
1271 | if (cb) | |
1272 | plug = container_of(cb, struct raid10_plug_cb, cb); | |
1273 | else | |
1274 | plug = NULL; | |
27f26a0f GJ |
1275 | if (plug) { |
1276 | bio_list_add(&plug->pending, mbio); | |
1277 | plug->pending_cnt++; | |
1278 | } else { | |
23b245c0 | 1279 | spin_lock_irqsave(&conf->device_lock, flags); |
27f26a0f GJ |
1280 | bio_list_add(&conf->pending_bio_list, mbio); |
1281 | conf->pending_count++; | |
23b245c0 | 1282 | spin_unlock_irqrestore(&conf->device_lock, flags); |
27f26a0f | 1283 | md_wakeup_thread(mddev->thread); |
23b245c0 | 1284 | } |
27f26a0f GJ |
1285 | } |
1286 | ||
1287 | static void raid10_write_request(struct mddev *mddev, struct bio *bio, | |
1288 | struct r10bio *r10_bio) | |
1289 | { | |
1290 | struct r10conf *conf = mddev->private; | |
1291 | int i; | |
1292 | struct md_rdev *blocked_rdev; | |
bb5f1ed7 | 1293 | sector_t sectors; |
d4432c23 | 1294 | int max_sectors; |
1da177e4 | 1295 | |
cc13b1d1 N |
1296 | /* |
1297 | * Register the new request and wait if the reconstruction | |
1298 | * thread has put up a bar for new requests. | |
1299 | * Continue immediately if no resync is active currently. | |
1300 | */ | |
1301 | wait_barrier(conf); | |
1302 | ||
fc9977dd | 1303 | sectors = r10_bio->sectors; |
3ea7daa5 | 1304 | while (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
4f024f37 KO |
1305 | bio->bi_iter.bi_sector < conf->reshape_progress && |
1306 | bio->bi_iter.bi_sector + sectors > conf->reshape_progress) { | |
bb5f1ed7 RL |
1307 | /* |
1308 | * IO spans the reshape position. Need to wait for reshape to | |
1309 | * pass | |
3ea7daa5 | 1310 | */ |
578b54ad | 1311 | raid10_log(conf->mddev, "wait reshape"); |
3ea7daa5 N |
1312 | allow_barrier(conf); |
1313 | wait_event(conf->wait_barrier, | |
4f024f37 KO |
1314 | conf->reshape_progress <= bio->bi_iter.bi_sector || |
1315 | conf->reshape_progress >= bio->bi_iter.bi_sector + | |
1316 | sectors); | |
3ea7daa5 N |
1317 | wait_barrier(conf); |
1318 | } | |
bb5f1ed7 | 1319 | |
3ea7daa5 | 1320 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
3ea7daa5 | 1321 | (mddev->reshape_backwards |
4f024f37 KO |
1322 | ? (bio->bi_iter.bi_sector < conf->reshape_safe && |
1323 | bio->bi_iter.bi_sector + sectors > conf->reshape_progress) | |
1324 | : (bio->bi_iter.bi_sector + sectors > conf->reshape_safe && | |
1325 | bio->bi_iter.bi_sector < conf->reshape_progress))) { | |
3ea7daa5 N |
1326 | /* Need to update reshape_position in metadata */ |
1327 | mddev->reshape_position = conf->reshape_progress; | |
2953079c SL |
1328 | set_mask_bits(&mddev->sb_flags, 0, |
1329 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
3ea7daa5 | 1330 | md_wakeup_thread(mddev->thread); |
578b54ad | 1331 | raid10_log(conf->mddev, "wait reshape metadata"); |
3ea7daa5 | 1332 | wait_event(mddev->sb_wait, |
2953079c | 1333 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); |
3ea7daa5 N |
1334 | |
1335 | conf->reshape_safe = mddev->reshape_position; | |
1336 | } | |
1337 | ||
34db0cd6 N |
1338 | if (conf->pending_count >= max_queued_requests) { |
1339 | md_wakeup_thread(mddev->thread); | |
578b54ad | 1340 | raid10_log(mddev, "wait queued"); |
34db0cd6 N |
1341 | wait_event(conf->wait_barrier, |
1342 | conf->pending_count < max_queued_requests); | |
1343 | } | |
6bfe0b49 | 1344 | /* first select target devices under rcu_lock and |
1da177e4 LT |
1345 | * inc refcount on their rdev. Record them by setting |
1346 | * bios[x] to bio | |
d4432c23 N |
1347 | * If there are known/acknowledged bad blocks on any device |
1348 | * on which we have seen a write error, we want to avoid | |
1349 | * writing to those blocks. This potentially requires several | |
1350 | * writes to write around the bad blocks. Each set of writes | |
fd16f2e8 | 1351 | * gets its own r10_bio with a set of bios attached. |
1da177e4 | 1352 | */ |
c3b328ac | 1353 | |
69335ef3 | 1354 | r10_bio->read_slot = -1; /* make sure repl_bio gets freed */ |
1da177e4 | 1355 | raid10_find_phys(conf, r10_bio); |
d4432c23 | 1356 | retry_write: |
cb6969e8 | 1357 | blocked_rdev = NULL; |
1da177e4 | 1358 | rcu_read_lock(); |
d4432c23 N |
1359 | max_sectors = r10_bio->sectors; |
1360 | ||
1da177e4 LT |
1361 | for (i = 0; i < conf->copies; i++) { |
1362 | int d = r10_bio->devs[i].devnum; | |
3cb03002 | 1363 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
475b0321 N |
1364 | struct md_rdev *rrdev = rcu_dereference( |
1365 | conf->mirrors[d].replacement); | |
4ca40c2c N |
1366 | if (rdev == rrdev) |
1367 | rrdev = NULL; | |
6bfe0b49 DW |
1368 | if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { |
1369 | atomic_inc(&rdev->nr_pending); | |
1370 | blocked_rdev = rdev; | |
1371 | break; | |
1372 | } | |
475b0321 N |
1373 | if (rrdev && unlikely(test_bit(Blocked, &rrdev->flags))) { |
1374 | atomic_inc(&rrdev->nr_pending); | |
1375 | blocked_rdev = rrdev; | |
1376 | break; | |
1377 | } | |
8ae12666 | 1378 | if (rdev && (test_bit(Faulty, &rdev->flags))) |
e7c0c3fa | 1379 | rdev = NULL; |
8ae12666 | 1380 | if (rrdev && (test_bit(Faulty, &rrdev->flags))) |
475b0321 N |
1381 | rrdev = NULL; |
1382 | ||
d4432c23 | 1383 | r10_bio->devs[i].bio = NULL; |
475b0321 | 1384 | r10_bio->devs[i].repl_bio = NULL; |
e7c0c3fa N |
1385 | |
1386 | if (!rdev && !rrdev) { | |
6cce3b23 | 1387 | set_bit(R10BIO_Degraded, &r10_bio->state); |
d4432c23 N |
1388 | continue; |
1389 | } | |
e7c0c3fa | 1390 | if (rdev && test_bit(WriteErrorSeen, &rdev->flags)) { |
d4432c23 N |
1391 | sector_t first_bad; |
1392 | sector_t dev_sector = r10_bio->devs[i].addr; | |
1393 | int bad_sectors; | |
1394 | int is_bad; | |
1395 | ||
bb5f1ed7 | 1396 | is_bad = is_badblock(rdev, dev_sector, max_sectors, |
d4432c23 N |
1397 | &first_bad, &bad_sectors); |
1398 | if (is_bad < 0) { | |
1399 | /* Mustn't write here until the bad block | |
1400 | * is acknowledged | |
1401 | */ | |
1402 | atomic_inc(&rdev->nr_pending); | |
1403 | set_bit(BlockedBadBlocks, &rdev->flags); | |
1404 | blocked_rdev = rdev; | |
1405 | break; | |
1406 | } | |
1407 | if (is_bad && first_bad <= dev_sector) { | |
1408 | /* Cannot write here at all */ | |
1409 | bad_sectors -= (dev_sector - first_bad); | |
1410 | if (bad_sectors < max_sectors) | |
1411 | /* Mustn't write more than bad_sectors | |
1412 | * to other devices yet | |
1413 | */ | |
1414 | max_sectors = bad_sectors; | |
1415 | /* We don't set R10BIO_Degraded as that | |
1416 | * only applies if the disk is missing, | |
1417 | * so it might be re-added, and we want to | |
1418 | * know to recover this chunk. | |
1419 | * In this case the device is here, and the | |
1420 | * fact that this chunk is not in-sync is | |
1421 | * recorded in the bad block log. | |
1422 | */ | |
1423 | continue; | |
1424 | } | |
1425 | if (is_bad) { | |
1426 | int good_sectors = first_bad - dev_sector; | |
1427 | if (good_sectors < max_sectors) | |
1428 | max_sectors = good_sectors; | |
1429 | } | |
6cce3b23 | 1430 | } |
e7c0c3fa N |
1431 | if (rdev) { |
1432 | r10_bio->devs[i].bio = bio; | |
1433 | atomic_inc(&rdev->nr_pending); | |
1434 | } | |
475b0321 N |
1435 | if (rrdev) { |
1436 | r10_bio->devs[i].repl_bio = bio; | |
1437 | atomic_inc(&rrdev->nr_pending); | |
1438 | } | |
1da177e4 LT |
1439 | } |
1440 | rcu_read_unlock(); | |
1441 | ||
6bfe0b49 DW |
1442 | if (unlikely(blocked_rdev)) { |
1443 | /* Have to wait for this device to get unblocked, then retry */ | |
1444 | int j; | |
1445 | int d; | |
1446 | ||
475b0321 | 1447 | for (j = 0; j < i; j++) { |
6bfe0b49 DW |
1448 | if (r10_bio->devs[j].bio) { |
1449 | d = r10_bio->devs[j].devnum; | |
1450 | rdev_dec_pending(conf->mirrors[d].rdev, mddev); | |
1451 | } | |
475b0321 | 1452 | if (r10_bio->devs[j].repl_bio) { |
4ca40c2c | 1453 | struct md_rdev *rdev; |
475b0321 | 1454 | d = r10_bio->devs[j].devnum; |
4ca40c2c N |
1455 | rdev = conf->mirrors[d].replacement; |
1456 | if (!rdev) { | |
1457 | /* Race with remove_disk */ | |
1458 | smp_mb(); | |
1459 | rdev = conf->mirrors[d].rdev; | |
1460 | } | |
1461 | rdev_dec_pending(rdev, mddev); | |
475b0321 N |
1462 | } |
1463 | } | |
6bfe0b49 | 1464 | allow_barrier(conf); |
578b54ad | 1465 | raid10_log(conf->mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); |
6bfe0b49 DW |
1466 | md_wait_for_blocked_rdev(blocked_rdev, mddev); |
1467 | wait_barrier(conf); | |
1468 | goto retry_write; | |
1469 | } | |
1470 | ||
6b6c8110 | 1471 | if (max_sectors < r10_bio->sectors) |
d4432c23 | 1472 | r10_bio->sectors = max_sectors; |
fc9977dd N |
1473 | |
1474 | if (r10_bio->sectors < bio_sectors(bio)) { | |
1475 | struct bio *split = bio_split(bio, r10_bio->sectors, | |
1476 | GFP_NOIO, conf->bio_split); | |
1477 | bio_chain(split, bio); | |
1478 | generic_make_request(bio); | |
1479 | bio = split; | |
1480 | r10_bio->master_bio = bio; | |
d4432c23 | 1481 | } |
d4432c23 | 1482 | |
4e78064f | 1483 | atomic_set(&r10_bio->remaining, 1); |
d4432c23 | 1484 | bitmap_startwrite(mddev->bitmap, r10_bio->sector, r10_bio->sectors, 0); |
06d91a5f | 1485 | |
1da177e4 | 1486 | for (i = 0; i < conf->copies; i++) { |
27f26a0f | 1487 | if (r10_bio->devs[i].bio) |
fc9977dd | 1488 | raid10_write_one_disk(mddev, r10_bio, bio, false, i); |
27f26a0f | 1489 | if (r10_bio->devs[i].repl_bio) |
fc9977dd | 1490 | raid10_write_one_disk(mddev, r10_bio, bio, true, i); |
d4432c23 | 1491 | } |
079fa166 | 1492 | one_write_done(r10_bio); |
20d0189b KO |
1493 | } |
1494 | ||
fc9977dd | 1495 | static void __make_request(struct mddev *mddev, struct bio *bio, int sectors) |
bb5f1ed7 RL |
1496 | { |
1497 | struct r10conf *conf = mddev->private; | |
1498 | struct r10bio *r10_bio; | |
1499 | ||
1500 | r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO); | |
1501 | ||
1502 | r10_bio->master_bio = bio; | |
fc9977dd | 1503 | r10_bio->sectors = sectors; |
bb5f1ed7 RL |
1504 | |
1505 | r10_bio->mddev = mddev; | |
1506 | r10_bio->sector = bio->bi_iter.bi_sector; | |
1507 | r10_bio->state = 0; | |
545250f2 | 1508 | memset(r10_bio->devs, 0, sizeof(r10_bio->devs[0]) * conf->copies); |
bb5f1ed7 RL |
1509 | |
1510 | if (bio_data_dir(bio) == READ) | |
1511 | raid10_read_request(mddev, bio, r10_bio); | |
1512 | else | |
1513 | raid10_write_request(mddev, bio, r10_bio); | |
1514 | } | |
1515 | ||
cc27b0c7 | 1516 | static bool raid10_make_request(struct mddev *mddev, struct bio *bio) |
20d0189b KO |
1517 | { |
1518 | struct r10conf *conf = mddev->private; | |
1519 | sector_t chunk_mask = (conf->geo.chunk_mask & conf->prev.chunk_mask); | |
1520 | int chunk_sects = chunk_mask + 1; | |
fc9977dd | 1521 | int sectors = bio_sectors(bio); |
20d0189b | 1522 | |
1eff9d32 | 1523 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
20d0189b | 1524 | md_flush_request(mddev, bio); |
cc27b0c7 | 1525 | return true; |
20d0189b KO |
1526 | } |
1527 | ||
cc27b0c7 N |
1528 | if (!md_write_start(mddev, bio)) |
1529 | return false; | |
1530 | ||
fc9977dd N |
1531 | /* |
1532 | * If this request crosses a chunk boundary, we need to split | |
1533 | * it. | |
1534 | */ | |
1535 | if (unlikely((bio->bi_iter.bi_sector & chunk_mask) + | |
1536 | sectors > chunk_sects | |
1537 | && (conf->geo.near_copies < conf->geo.raid_disks | |
1538 | || conf->prev.near_copies < | |
1539 | conf->prev.raid_disks))) | |
1540 | sectors = chunk_sects - | |
1541 | (bio->bi_iter.bi_sector & | |
1542 | (chunk_sects - 1)); | |
1543 | __make_request(mddev, bio, sectors); | |
079fa166 N |
1544 | |
1545 | /* In case raid10d snuck in to freeze_array */ | |
1546 | wake_up(&conf->wait_barrier); | |
cc27b0c7 | 1547 | return true; |
1da177e4 LT |
1548 | } |
1549 | ||
849674e4 | 1550 | static void raid10_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 1551 | { |
e879a879 | 1552 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
1553 | int i; |
1554 | ||
5cf00fcd | 1555 | if (conf->geo.near_copies < conf->geo.raid_disks) |
9d8f0363 | 1556 | seq_printf(seq, " %dK chunks", mddev->chunk_sectors / 2); |
5cf00fcd N |
1557 | if (conf->geo.near_copies > 1) |
1558 | seq_printf(seq, " %d near-copies", conf->geo.near_copies); | |
1559 | if (conf->geo.far_copies > 1) { | |
1560 | if (conf->geo.far_offset) | |
1561 | seq_printf(seq, " %d offset-copies", conf->geo.far_copies); | |
c93983bf | 1562 | else |
5cf00fcd | 1563 | seq_printf(seq, " %d far-copies", conf->geo.far_copies); |
8bce6d35 N |
1564 | if (conf->geo.far_set_size != conf->geo.raid_disks) |
1565 | seq_printf(seq, " %d devices per set", conf->geo.far_set_size); | |
c93983bf | 1566 | } |
5cf00fcd N |
1567 | seq_printf(seq, " [%d/%d] [", conf->geo.raid_disks, |
1568 | conf->geo.raid_disks - mddev->degraded); | |
d44b0a92 N |
1569 | rcu_read_lock(); |
1570 | for (i = 0; i < conf->geo.raid_disks; i++) { | |
1571 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
1572 | seq_printf(seq, "%s", rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); | |
1573 | } | |
1574 | rcu_read_unlock(); | |
1da177e4 LT |
1575 | seq_printf(seq, "]"); |
1576 | } | |
1577 | ||
700c7213 N |
1578 | /* check if there are enough drives for |
1579 | * every block to appear on atleast one. | |
1580 | * Don't consider the device numbered 'ignore' | |
1581 | * as we might be about to remove it. | |
1582 | */ | |
635f6416 | 1583 | static int _enough(struct r10conf *conf, int previous, int ignore) |
700c7213 N |
1584 | { |
1585 | int first = 0; | |
725d6e57 | 1586 | int has_enough = 0; |
635f6416 N |
1587 | int disks, ncopies; |
1588 | if (previous) { | |
1589 | disks = conf->prev.raid_disks; | |
1590 | ncopies = conf->prev.near_copies; | |
1591 | } else { | |
1592 | disks = conf->geo.raid_disks; | |
1593 | ncopies = conf->geo.near_copies; | |
1594 | } | |
700c7213 | 1595 | |
725d6e57 | 1596 | rcu_read_lock(); |
700c7213 N |
1597 | do { |
1598 | int n = conf->copies; | |
1599 | int cnt = 0; | |
80b48124 | 1600 | int this = first; |
700c7213 | 1601 | while (n--) { |
725d6e57 N |
1602 | struct md_rdev *rdev; |
1603 | if (this != ignore && | |
1604 | (rdev = rcu_dereference(conf->mirrors[this].rdev)) && | |
1605 | test_bit(In_sync, &rdev->flags)) | |
700c7213 | 1606 | cnt++; |
635f6416 | 1607 | this = (this+1) % disks; |
700c7213 N |
1608 | } |
1609 | if (cnt == 0) | |
725d6e57 | 1610 | goto out; |
635f6416 | 1611 | first = (first + ncopies) % disks; |
700c7213 | 1612 | } while (first != 0); |
725d6e57 N |
1613 | has_enough = 1; |
1614 | out: | |
1615 | rcu_read_unlock(); | |
1616 | return has_enough; | |
700c7213 N |
1617 | } |
1618 | ||
f8c9e74f N |
1619 | static int enough(struct r10conf *conf, int ignore) |
1620 | { | |
635f6416 N |
1621 | /* when calling 'enough', both 'prev' and 'geo' must |
1622 | * be stable. | |
1623 | * This is ensured if ->reconfig_mutex or ->device_lock | |
1624 | * is held. | |
1625 | */ | |
1626 | return _enough(conf, 0, ignore) && | |
1627 | _enough(conf, 1, ignore); | |
f8c9e74f N |
1628 | } |
1629 | ||
849674e4 | 1630 | static void raid10_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1631 | { |
1632 | char b[BDEVNAME_SIZE]; | |
e879a879 | 1633 | struct r10conf *conf = mddev->private; |
635f6416 | 1634 | unsigned long flags; |
1da177e4 LT |
1635 | |
1636 | /* | |
1637 | * If it is not operational, then we have already marked it as dead | |
1638 | * else if it is the last working disks, ignore the error, let the | |
1639 | * next level up know. | |
1640 | * else mark the drive as failed | |
1641 | */ | |
635f6416 | 1642 | spin_lock_irqsave(&conf->device_lock, flags); |
b2d444d7 | 1643 | if (test_bit(In_sync, &rdev->flags) |
635f6416 | 1644 | && !enough(conf, rdev->raid_disk)) { |
1da177e4 LT |
1645 | /* |
1646 | * Don't fail the drive, just return an IO error. | |
1da177e4 | 1647 | */ |
635f6416 | 1648 | spin_unlock_irqrestore(&conf->device_lock, flags); |
1da177e4 | 1649 | return; |
635f6416 | 1650 | } |
2446dba0 | 1651 | if (test_and_clear_bit(In_sync, &rdev->flags)) |
1da177e4 | 1652 | mddev->degraded++; |
2446dba0 N |
1653 | /* |
1654 | * If recovery is running, make sure it aborts. | |
1655 | */ | |
1656 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
de393cde | 1657 | set_bit(Blocked, &rdev->flags); |
b2d444d7 | 1658 | set_bit(Faulty, &rdev->flags); |
2953079c SL |
1659 | set_mask_bits(&mddev->sb_flags, 0, |
1660 | BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); | |
635f6416 | 1661 | spin_unlock_irqrestore(&conf->device_lock, flags); |
08464e09 N |
1662 | pr_crit("md/raid10:%s: Disk failure on %s, disabling device.\n" |
1663 | "md/raid10:%s: Operation continuing on %d devices.\n", | |
1664 | mdname(mddev), bdevname(rdev->bdev, b), | |
1665 | mdname(mddev), conf->geo.raid_disks - mddev->degraded); | |
1da177e4 LT |
1666 | } |
1667 | ||
e879a879 | 1668 | static void print_conf(struct r10conf *conf) |
1da177e4 LT |
1669 | { |
1670 | int i; | |
4056ca51 | 1671 | struct md_rdev *rdev; |
1da177e4 | 1672 | |
08464e09 | 1673 | pr_debug("RAID10 conf printout:\n"); |
1da177e4 | 1674 | if (!conf) { |
08464e09 | 1675 | pr_debug("(!conf)\n"); |
1da177e4 LT |
1676 | return; |
1677 | } | |
08464e09 N |
1678 | pr_debug(" --- wd:%d rd:%d\n", conf->geo.raid_disks - conf->mddev->degraded, |
1679 | conf->geo.raid_disks); | |
1da177e4 | 1680 | |
4056ca51 N |
1681 | /* This is only called with ->reconfix_mutex held, so |
1682 | * rcu protection of rdev is not needed */ | |
5cf00fcd | 1683 | for (i = 0; i < conf->geo.raid_disks; i++) { |
1da177e4 | 1684 | char b[BDEVNAME_SIZE]; |
4056ca51 N |
1685 | rdev = conf->mirrors[i].rdev; |
1686 | if (rdev) | |
08464e09 N |
1687 | pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", |
1688 | i, !test_bit(In_sync, &rdev->flags), | |
1689 | !test_bit(Faulty, &rdev->flags), | |
1690 | bdevname(rdev->bdev,b)); | |
1da177e4 LT |
1691 | } |
1692 | } | |
1693 | ||
e879a879 | 1694 | static void close_sync(struct r10conf *conf) |
1da177e4 | 1695 | { |
0a27ec96 N |
1696 | wait_barrier(conf); |
1697 | allow_barrier(conf); | |
1da177e4 LT |
1698 | |
1699 | mempool_destroy(conf->r10buf_pool); | |
1700 | conf->r10buf_pool = NULL; | |
1701 | } | |
1702 | ||
fd01b88c | 1703 | static int raid10_spare_active(struct mddev *mddev) |
1da177e4 LT |
1704 | { |
1705 | int i; | |
e879a879 | 1706 | struct r10conf *conf = mddev->private; |
dc280d98 | 1707 | struct raid10_info *tmp; |
6b965620 N |
1708 | int count = 0; |
1709 | unsigned long flags; | |
1da177e4 LT |
1710 | |
1711 | /* | |
1712 | * Find all non-in_sync disks within the RAID10 configuration | |
1713 | * and mark them in_sync | |
1714 | */ | |
5cf00fcd | 1715 | for (i = 0; i < conf->geo.raid_disks; i++) { |
1da177e4 | 1716 | tmp = conf->mirrors + i; |
4ca40c2c N |
1717 | if (tmp->replacement |
1718 | && tmp->replacement->recovery_offset == MaxSector | |
1719 | && !test_bit(Faulty, &tmp->replacement->flags) | |
1720 | && !test_and_set_bit(In_sync, &tmp->replacement->flags)) { | |
1721 | /* Replacement has just become active */ | |
1722 | if (!tmp->rdev | |
1723 | || !test_and_clear_bit(In_sync, &tmp->rdev->flags)) | |
1724 | count++; | |
1725 | if (tmp->rdev) { | |
1726 | /* Replaced device not technically faulty, | |
1727 | * but we need to be sure it gets removed | |
1728 | * and never re-added. | |
1729 | */ | |
1730 | set_bit(Faulty, &tmp->rdev->flags); | |
1731 | sysfs_notify_dirent_safe( | |
1732 | tmp->rdev->sysfs_state); | |
1733 | } | |
1734 | sysfs_notify_dirent_safe(tmp->replacement->sysfs_state); | |
1735 | } else if (tmp->rdev | |
61e4947c | 1736 | && tmp->rdev->recovery_offset == MaxSector |
4ca40c2c N |
1737 | && !test_bit(Faulty, &tmp->rdev->flags) |
1738 | && !test_and_set_bit(In_sync, &tmp->rdev->flags)) { | |
6b965620 | 1739 | count++; |
2863b9eb | 1740 | sysfs_notify_dirent_safe(tmp->rdev->sysfs_state); |
1da177e4 LT |
1741 | } |
1742 | } | |
6b965620 N |
1743 | spin_lock_irqsave(&conf->device_lock, flags); |
1744 | mddev->degraded -= count; | |
1745 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 LT |
1746 | |
1747 | print_conf(conf); | |
6b965620 | 1748 | return count; |
1da177e4 LT |
1749 | } |
1750 | ||
fd01b88c | 1751 | static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1752 | { |
e879a879 | 1753 | struct r10conf *conf = mddev->private; |
199050ea | 1754 | int err = -EEXIST; |
1da177e4 | 1755 | int mirror; |
6c2fce2e | 1756 | int first = 0; |
5cf00fcd | 1757 | int last = conf->geo.raid_disks - 1; |
1da177e4 LT |
1758 | |
1759 | if (mddev->recovery_cp < MaxSector) | |
1760 | /* only hot-add to in-sync arrays, as recovery is | |
1761 | * very different from resync | |
1762 | */ | |
199050ea | 1763 | return -EBUSY; |
635f6416 | 1764 | if (rdev->saved_raid_disk < 0 && !_enough(conf, 1, -1)) |
199050ea | 1765 | return -EINVAL; |
1da177e4 | 1766 | |
1501efad DW |
1767 | if (md_integrity_add_rdev(rdev, mddev)) |
1768 | return -ENXIO; | |
1769 | ||
a53a6c85 | 1770 | if (rdev->raid_disk >= 0) |
6c2fce2e | 1771 | first = last = rdev->raid_disk; |
1da177e4 | 1772 | |
2c4193df | 1773 | if (rdev->saved_raid_disk >= first && |
6cce3b23 N |
1774 | conf->mirrors[rdev->saved_raid_disk].rdev == NULL) |
1775 | mirror = rdev->saved_raid_disk; | |
1776 | else | |
6c2fce2e | 1777 | mirror = first; |
2bb77736 | 1778 | for ( ; mirror <= last ; mirror++) { |
dc280d98 | 1779 | struct raid10_info *p = &conf->mirrors[mirror]; |
2bb77736 N |
1780 | if (p->recovery_disabled == mddev->recovery_disabled) |
1781 | continue; | |
b7044d41 N |
1782 | if (p->rdev) { |
1783 | if (!test_bit(WantReplacement, &p->rdev->flags) || | |
1784 | p->replacement != NULL) | |
1785 | continue; | |
1786 | clear_bit(In_sync, &rdev->flags); | |
1787 | set_bit(Replacement, &rdev->flags); | |
1788 | rdev->raid_disk = mirror; | |
1789 | err = 0; | |
9092c02d JB |
1790 | if (mddev->gendisk) |
1791 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1792 | rdev->data_offset << 9); | |
b7044d41 N |
1793 | conf->fullsync = 1; |
1794 | rcu_assign_pointer(p->replacement, rdev); | |
1795 | break; | |
1796 | } | |
1da177e4 | 1797 | |
9092c02d JB |
1798 | if (mddev->gendisk) |
1799 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
1800 | rdev->data_offset << 9); | |
1da177e4 | 1801 | |
2bb77736 | 1802 | p->head_position = 0; |
d890fa2b | 1803 | p->recovery_disabled = mddev->recovery_disabled - 1; |
2bb77736 N |
1804 | rdev->raid_disk = mirror; |
1805 | err = 0; | |
1806 | if (rdev->saved_raid_disk != mirror) | |
1807 | conf->fullsync = 1; | |
1808 | rcu_assign_pointer(p->rdev, rdev); | |
1809 | break; | |
1810 | } | |
ed30be07 | 1811 | if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) |
532a2a3f SL |
1812 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); |
1813 | ||
1da177e4 | 1814 | print_conf(conf); |
199050ea | 1815 | return err; |
1da177e4 LT |
1816 | } |
1817 | ||
b8321b68 | 1818 | static int raid10_remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1819 | { |
e879a879 | 1820 | struct r10conf *conf = mddev->private; |
1da177e4 | 1821 | int err = 0; |
b8321b68 | 1822 | int number = rdev->raid_disk; |
c8ab903e | 1823 | struct md_rdev **rdevp; |
dc280d98 | 1824 | struct raid10_info *p = conf->mirrors + number; |
1da177e4 LT |
1825 | |
1826 | print_conf(conf); | |
c8ab903e N |
1827 | if (rdev == p->rdev) |
1828 | rdevp = &p->rdev; | |
1829 | else if (rdev == p->replacement) | |
1830 | rdevp = &p->replacement; | |
1831 | else | |
1832 | return 0; | |
1833 | ||
1834 | if (test_bit(In_sync, &rdev->flags) || | |
1835 | atomic_read(&rdev->nr_pending)) { | |
1836 | err = -EBUSY; | |
1837 | goto abort; | |
1838 | } | |
d787be40 | 1839 | /* Only remove non-faulty devices if recovery |
c8ab903e N |
1840 | * is not possible. |
1841 | */ | |
1842 | if (!test_bit(Faulty, &rdev->flags) && | |
1843 | mddev->recovery_disabled != p->recovery_disabled && | |
4ca40c2c | 1844 | (!p->replacement || p->replacement == rdev) && |
63aced61 | 1845 | number < conf->geo.raid_disks && |
c8ab903e N |
1846 | enough(conf, -1)) { |
1847 | err = -EBUSY; | |
1848 | goto abort; | |
1da177e4 | 1849 | } |
c8ab903e | 1850 | *rdevp = NULL; |
d787be40 N |
1851 | if (!test_bit(RemoveSynchronized, &rdev->flags)) { |
1852 | synchronize_rcu(); | |
1853 | if (atomic_read(&rdev->nr_pending)) { | |
1854 | /* lost the race, try later */ | |
1855 | err = -EBUSY; | |
1856 | *rdevp = rdev; | |
1857 | goto abort; | |
1858 | } | |
1859 | } | |
1860 | if (p->replacement) { | |
4ca40c2c N |
1861 | /* We must have just cleared 'rdev' */ |
1862 | p->rdev = p->replacement; | |
1863 | clear_bit(Replacement, &p->replacement->flags); | |
1864 | smp_mb(); /* Make sure other CPUs may see both as identical | |
1865 | * but will never see neither -- if they are careful. | |
1866 | */ | |
1867 | p->replacement = NULL; | |
e5bc9c3c | 1868 | } |
4ca40c2c | 1869 | |
e5bc9c3c | 1870 | clear_bit(WantReplacement, &rdev->flags); |
c8ab903e N |
1871 | err = md_integrity_register(mddev); |
1872 | ||
1da177e4 LT |
1873 | abort: |
1874 | ||
1875 | print_conf(conf); | |
1876 | return err; | |
1877 | } | |
1878 | ||
81fa1520 | 1879 | static void __end_sync_read(struct r10bio *r10_bio, struct bio *bio, int d) |
1da177e4 | 1880 | { |
e879a879 | 1881 | struct r10conf *conf = r10_bio->mddev->private; |
0eb3ff12 | 1882 | |
4e4cbee9 | 1883 | if (!bio->bi_status) |
0eb3ff12 | 1884 | set_bit(R10BIO_Uptodate, &r10_bio->state); |
e684e41d N |
1885 | else |
1886 | /* The write handler will notice the lack of | |
1887 | * R10BIO_Uptodate and record any errors etc | |
1888 | */ | |
4dbcdc75 N |
1889 | atomic_add(r10_bio->sectors, |
1890 | &conf->mirrors[d].rdev->corrected_errors); | |
1da177e4 LT |
1891 | |
1892 | /* for reconstruct, we always reschedule after a read. | |
1893 | * for resync, only after all reads | |
1894 | */ | |
73d5c38a | 1895 | rdev_dec_pending(conf->mirrors[d].rdev, conf->mddev); |
1da177e4 LT |
1896 | if (test_bit(R10BIO_IsRecover, &r10_bio->state) || |
1897 | atomic_dec_and_test(&r10_bio->remaining)) { | |
1898 | /* we have read all the blocks, | |
1899 | * do the comparison in process context in raid10d | |
1900 | */ | |
1901 | reschedule_retry(r10_bio); | |
1902 | } | |
1da177e4 LT |
1903 | } |
1904 | ||
81fa1520 ML |
1905 | static void end_sync_read(struct bio *bio) |
1906 | { | |
f0250618 | 1907 | struct r10bio *r10_bio = get_resync_r10bio(bio); |
81fa1520 ML |
1908 | struct r10conf *conf = r10_bio->mddev->private; |
1909 | int d = find_bio_disk(conf, r10_bio, bio, NULL, NULL); | |
1910 | ||
1911 | __end_sync_read(r10_bio, bio, d); | |
1912 | } | |
1913 | ||
1914 | static void end_reshape_read(struct bio *bio) | |
1915 | { | |
f0250618 | 1916 | /* reshape read bio isn't allocated from r10buf_pool */ |
81fa1520 ML |
1917 | struct r10bio *r10_bio = bio->bi_private; |
1918 | ||
1919 | __end_sync_read(r10_bio, bio, r10_bio->read_slot); | |
1920 | } | |
1921 | ||
9f2c9d12 | 1922 | static void end_sync_request(struct r10bio *r10_bio) |
1da177e4 | 1923 | { |
fd01b88c | 1924 | struct mddev *mddev = r10_bio->mddev; |
dfc70645 | 1925 | |
1da177e4 LT |
1926 | while (atomic_dec_and_test(&r10_bio->remaining)) { |
1927 | if (r10_bio->master_bio == NULL) { | |
1928 | /* the primary of several recovery bios */ | |
73d5c38a | 1929 | sector_t s = r10_bio->sectors; |
1a0b7cd8 N |
1930 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
1931 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
1932 | reschedule_retry(r10_bio); |
1933 | else | |
1934 | put_buf(r10_bio); | |
73d5c38a | 1935 | md_done_sync(mddev, s, 1); |
1da177e4 LT |
1936 | break; |
1937 | } else { | |
9f2c9d12 | 1938 | struct r10bio *r10_bio2 = (struct r10bio *)r10_bio->master_bio; |
1a0b7cd8 N |
1939 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
1940 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 N |
1941 | reschedule_retry(r10_bio); |
1942 | else | |
1943 | put_buf(r10_bio); | |
1da177e4 LT |
1944 | r10_bio = r10_bio2; |
1945 | } | |
1946 | } | |
1da177e4 LT |
1947 | } |
1948 | ||
4246a0b6 | 1949 | static void end_sync_write(struct bio *bio) |
5e570289 | 1950 | { |
f0250618 | 1951 | struct r10bio *r10_bio = get_resync_r10bio(bio); |
fd01b88c | 1952 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 1953 | struct r10conf *conf = mddev->private; |
5e570289 N |
1954 | int d; |
1955 | sector_t first_bad; | |
1956 | int bad_sectors; | |
1957 | int slot; | |
9ad1aefc | 1958 | int repl; |
4ca40c2c | 1959 | struct md_rdev *rdev = NULL; |
5e570289 | 1960 | |
9ad1aefc N |
1961 | d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); |
1962 | if (repl) | |
1963 | rdev = conf->mirrors[d].replacement; | |
547414d1 | 1964 | else |
9ad1aefc | 1965 | rdev = conf->mirrors[d].rdev; |
5e570289 | 1966 | |
4e4cbee9 | 1967 | if (bio->bi_status) { |
9ad1aefc N |
1968 | if (repl) |
1969 | md_error(mddev, rdev); | |
1970 | else { | |
1971 | set_bit(WriteErrorSeen, &rdev->flags); | |
b7044d41 N |
1972 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
1973 | set_bit(MD_RECOVERY_NEEDED, | |
1974 | &rdev->mddev->recovery); | |
9ad1aefc N |
1975 | set_bit(R10BIO_WriteError, &r10_bio->state); |
1976 | } | |
1977 | } else if (is_badblock(rdev, | |
5e570289 N |
1978 | r10_bio->devs[slot].addr, |
1979 | r10_bio->sectors, | |
1980 | &first_bad, &bad_sectors)) | |
1981 | set_bit(R10BIO_MadeGood, &r10_bio->state); | |
1982 | ||
9ad1aefc | 1983 | rdev_dec_pending(rdev, mddev); |
5e570289 N |
1984 | |
1985 | end_sync_request(r10_bio); | |
1986 | } | |
1987 | ||
1da177e4 LT |
1988 | /* |
1989 | * Note: sync and recover and handled very differently for raid10 | |
1990 | * This code is for resync. | |
1991 | * For resync, we read through virtual addresses and read all blocks. | |
1992 | * If there is any error, we schedule a write. The lowest numbered | |
1993 | * drive is authoritative. | |
1994 | * However requests come for physical address, so we need to map. | |
1995 | * For every physical address there are raid_disks/copies virtual addresses, | |
1996 | * which is always are least one, but is not necessarly an integer. | |
1997 | * This means that a physical address can span multiple chunks, so we may | |
1998 | * have to submit multiple io requests for a single sync request. | |
1999 | */ | |
2000 | /* | |
2001 | * We check if all blocks are in-sync and only write to blocks that | |
2002 | * aren't in sync | |
2003 | */ | |
9f2c9d12 | 2004 | static void sync_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 2005 | { |
e879a879 | 2006 | struct r10conf *conf = mddev->private; |
1da177e4 LT |
2007 | int i, first; |
2008 | struct bio *tbio, *fbio; | |
f4380a91 | 2009 | int vcnt; |
cdb76be3 | 2010 | struct page **tpages, **fpages; |
1da177e4 LT |
2011 | |
2012 | atomic_set(&r10_bio->remaining, 1); | |
2013 | ||
2014 | /* find the first device with a block */ | |
2015 | for (i=0; i<conf->copies; i++) | |
4e4cbee9 | 2016 | if (!r10_bio->devs[i].bio->bi_status) |
1da177e4 LT |
2017 | break; |
2018 | ||
2019 | if (i == conf->copies) | |
2020 | goto done; | |
2021 | ||
2022 | first = i; | |
2023 | fbio = r10_bio->devs[i].bio; | |
cc578588 AP |
2024 | fbio->bi_iter.bi_size = r10_bio->sectors << 9; |
2025 | fbio->bi_iter.bi_idx = 0; | |
cdb76be3 | 2026 | fpages = get_resync_pages(fbio)->pages; |
1da177e4 | 2027 | |
f4380a91 | 2028 | vcnt = (r10_bio->sectors + (PAGE_SIZE >> 9) - 1) >> (PAGE_SHIFT - 9); |
1da177e4 | 2029 | /* now find blocks with errors */ |
0eb3ff12 N |
2030 | for (i=0 ; i < conf->copies ; i++) { |
2031 | int j, d; | |
8d3ca83d | 2032 | struct md_rdev *rdev; |
f0250618 | 2033 | struct resync_pages *rp; |
1da177e4 | 2034 | |
1da177e4 | 2035 | tbio = r10_bio->devs[i].bio; |
0eb3ff12 N |
2036 | |
2037 | if (tbio->bi_end_io != end_sync_read) | |
2038 | continue; | |
2039 | if (i == first) | |
1da177e4 | 2040 | continue; |
cdb76be3 ML |
2041 | |
2042 | tpages = get_resync_pages(tbio)->pages; | |
8d3ca83d N |
2043 | d = r10_bio->devs[i].devnum; |
2044 | rdev = conf->mirrors[d].rdev; | |
4e4cbee9 | 2045 | if (!r10_bio->devs[i].bio->bi_status) { |
0eb3ff12 N |
2046 | /* We know that the bi_io_vec layout is the same for |
2047 | * both 'first' and 'i', so we just compare them. | |
2048 | * All vec entries are PAGE_SIZE; | |
2049 | */ | |
7bb23c49 N |
2050 | int sectors = r10_bio->sectors; |
2051 | for (j = 0; j < vcnt; j++) { | |
2052 | int len = PAGE_SIZE; | |
2053 | if (sectors < (len / 512)) | |
2054 | len = sectors * 512; | |
cdb76be3 ML |
2055 | if (memcmp(page_address(fpages[j]), |
2056 | page_address(tpages[j]), | |
7bb23c49 | 2057 | len)) |
0eb3ff12 | 2058 | break; |
7bb23c49 N |
2059 | sectors -= len/512; |
2060 | } | |
0eb3ff12 N |
2061 | if (j == vcnt) |
2062 | continue; | |
7f7583d4 | 2063 | atomic64_add(r10_bio->sectors, &mddev->resync_mismatches); |
f84ee364 N |
2064 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
2065 | /* Don't fix anything. */ | |
2066 | continue; | |
8d3ca83d N |
2067 | } else if (test_bit(FailFast, &rdev->flags)) { |
2068 | /* Just give up on this device */ | |
2069 | md_error(rdev->mddev, rdev); | |
2070 | continue; | |
0eb3ff12 | 2071 | } |
f84ee364 N |
2072 | /* Ok, we need to write this bio, either to correct an |
2073 | * inconsistency or to correct an unreadable block. | |
1da177e4 LT |
2074 | * First we need to fixup bv_offset, bv_len and |
2075 | * bi_vecs, as the read request might have corrupted these | |
2076 | */ | |
f0250618 | 2077 | rp = get_resync_pages(tbio); |
8be185f2 KO |
2078 | bio_reset(tbio); |
2079 | ||
fb0eb5df ML |
2080 | md_bio_reset_resync_pages(tbio, rp, fbio->bi_iter.bi_size); |
2081 | ||
f0250618 ML |
2082 | rp->raid_bio = r10_bio; |
2083 | tbio->bi_private = rp; | |
4f024f37 | 2084 | tbio->bi_iter.bi_sector = r10_bio->devs[i].addr; |
1da177e4 | 2085 | tbio->bi_end_io = end_sync_write; |
796a5cf0 | 2086 | bio_set_op_attrs(tbio, REQ_OP_WRITE, 0); |
1da177e4 | 2087 | |
c31df25f KO |
2088 | bio_copy_data(tbio, fbio); |
2089 | ||
1da177e4 LT |
2090 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); |
2091 | atomic_inc(&r10_bio->remaining); | |
aa8b57aa | 2092 | md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(tbio)); |
1da177e4 | 2093 | |
1919cbb2 N |
2094 | if (test_bit(FailFast, &conf->mirrors[d].rdev->flags)) |
2095 | tbio->bi_opf |= MD_FAILFAST; | |
4f024f37 | 2096 | tbio->bi_iter.bi_sector += conf->mirrors[d].rdev->data_offset; |
1da177e4 LT |
2097 | tbio->bi_bdev = conf->mirrors[d].rdev->bdev; |
2098 | generic_make_request(tbio); | |
2099 | } | |
2100 | ||
9ad1aefc N |
2101 | /* Now write out to any replacement devices |
2102 | * that are active | |
2103 | */ | |
2104 | for (i = 0; i < conf->copies; i++) { | |
c31df25f | 2105 | int d; |
9ad1aefc N |
2106 | |
2107 | tbio = r10_bio->devs[i].repl_bio; | |
2108 | if (!tbio || !tbio->bi_end_io) | |
2109 | continue; | |
2110 | if (r10_bio->devs[i].bio->bi_end_io != end_sync_write | |
2111 | && r10_bio->devs[i].bio != fbio) | |
c31df25f | 2112 | bio_copy_data(tbio, fbio); |
9ad1aefc N |
2113 | d = r10_bio->devs[i].devnum; |
2114 | atomic_inc(&r10_bio->remaining); | |
2115 | md_sync_acct(conf->mirrors[d].replacement->bdev, | |
aa8b57aa | 2116 | bio_sectors(tbio)); |
9ad1aefc N |
2117 | generic_make_request(tbio); |
2118 | } | |
2119 | ||
1da177e4 LT |
2120 | done: |
2121 | if (atomic_dec_and_test(&r10_bio->remaining)) { | |
2122 | md_done_sync(mddev, r10_bio->sectors, 1); | |
2123 | put_buf(r10_bio); | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | /* | |
2128 | * Now for the recovery code. | |
2129 | * Recovery happens across physical sectors. | |
2130 | * We recover all non-is_sync drives by finding the virtual address of | |
2131 | * each, and then choose a working drive that also has that virt address. | |
2132 | * There is a separate r10_bio for each non-in_sync drive. | |
2133 | * Only the first two slots are in use. The first for reading, | |
2134 | * The second for writing. | |
2135 | * | |
2136 | */ | |
9f2c9d12 | 2137 | static void fix_recovery_read_error(struct r10bio *r10_bio) |
5e570289 N |
2138 | { |
2139 | /* We got a read error during recovery. | |
2140 | * We repeat the read in smaller page-sized sections. | |
2141 | * If a read succeeds, write it to the new device or record | |
2142 | * a bad block if we cannot. | |
2143 | * If a read fails, record a bad block on both old and | |
2144 | * new devices. | |
2145 | */ | |
fd01b88c | 2146 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2147 | struct r10conf *conf = mddev->private; |
5e570289 N |
2148 | struct bio *bio = r10_bio->devs[0].bio; |
2149 | sector_t sect = 0; | |
2150 | int sectors = r10_bio->sectors; | |
2151 | int idx = 0; | |
2152 | int dr = r10_bio->devs[0].devnum; | |
2153 | int dw = r10_bio->devs[1].devnum; | |
cdb76be3 | 2154 | struct page **pages = get_resync_pages(bio)->pages; |
5e570289 N |
2155 | |
2156 | while (sectors) { | |
2157 | int s = sectors; | |
3cb03002 | 2158 | struct md_rdev *rdev; |
5e570289 N |
2159 | sector_t addr; |
2160 | int ok; | |
2161 | ||
2162 | if (s > (PAGE_SIZE>>9)) | |
2163 | s = PAGE_SIZE >> 9; | |
2164 | ||
2165 | rdev = conf->mirrors[dr].rdev; | |
2166 | addr = r10_bio->devs[0].addr + sect, | |
2167 | ok = sync_page_io(rdev, | |
2168 | addr, | |
2169 | s << 9, | |
cdb76be3 | 2170 | pages[idx], |
796a5cf0 | 2171 | REQ_OP_READ, 0, false); |
5e570289 N |
2172 | if (ok) { |
2173 | rdev = conf->mirrors[dw].rdev; | |
2174 | addr = r10_bio->devs[1].addr + sect; | |
2175 | ok = sync_page_io(rdev, | |
2176 | addr, | |
2177 | s << 9, | |
cdb76be3 | 2178 | pages[idx], |
796a5cf0 | 2179 | REQ_OP_WRITE, 0, false); |
b7044d41 | 2180 | if (!ok) { |
5e570289 | 2181 | set_bit(WriteErrorSeen, &rdev->flags); |
b7044d41 N |
2182 | if (!test_and_set_bit(WantReplacement, |
2183 | &rdev->flags)) | |
2184 | set_bit(MD_RECOVERY_NEEDED, | |
2185 | &rdev->mddev->recovery); | |
2186 | } | |
5e570289 N |
2187 | } |
2188 | if (!ok) { | |
2189 | /* We don't worry if we cannot set a bad block - | |
2190 | * it really is bad so there is no loss in not | |
2191 | * recording it yet | |
2192 | */ | |
2193 | rdev_set_badblocks(rdev, addr, s, 0); | |
2194 | ||
2195 | if (rdev != conf->mirrors[dw].rdev) { | |
2196 | /* need bad block on destination too */ | |
3cb03002 | 2197 | struct md_rdev *rdev2 = conf->mirrors[dw].rdev; |
5e570289 N |
2198 | addr = r10_bio->devs[1].addr + sect; |
2199 | ok = rdev_set_badblocks(rdev2, addr, s, 0); | |
2200 | if (!ok) { | |
2201 | /* just abort the recovery */ | |
08464e09 N |
2202 | pr_notice("md/raid10:%s: recovery aborted due to read error\n", |
2203 | mdname(mddev)); | |
5e570289 N |
2204 | |
2205 | conf->mirrors[dw].recovery_disabled | |
2206 | = mddev->recovery_disabled; | |
2207 | set_bit(MD_RECOVERY_INTR, | |
2208 | &mddev->recovery); | |
2209 | break; | |
2210 | } | |
2211 | } | |
2212 | } | |
2213 | ||
2214 | sectors -= s; | |
2215 | sect += s; | |
2216 | idx++; | |
2217 | } | |
2218 | } | |
1da177e4 | 2219 | |
9f2c9d12 | 2220 | static void recovery_request_write(struct mddev *mddev, struct r10bio *r10_bio) |
1da177e4 | 2221 | { |
e879a879 | 2222 | struct r10conf *conf = mddev->private; |
c65060ad | 2223 | int d; |
24afd80d | 2224 | struct bio *wbio, *wbio2; |
1da177e4 | 2225 | |
5e570289 N |
2226 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) { |
2227 | fix_recovery_read_error(r10_bio); | |
2228 | end_sync_request(r10_bio); | |
2229 | return; | |
2230 | } | |
2231 | ||
c65060ad NK |
2232 | /* |
2233 | * share the pages with the first bio | |
1da177e4 LT |
2234 | * and submit the write request |
2235 | */ | |
1da177e4 | 2236 | d = r10_bio->devs[1].devnum; |
24afd80d N |
2237 | wbio = r10_bio->devs[1].bio; |
2238 | wbio2 = r10_bio->devs[1].repl_bio; | |
0eb25bb0 N |
2239 | /* Need to test wbio2->bi_end_io before we call |
2240 | * generic_make_request as if the former is NULL, | |
2241 | * the latter is free to free wbio2. | |
2242 | */ | |
2243 | if (wbio2 && !wbio2->bi_end_io) | |
2244 | wbio2 = NULL; | |
24afd80d N |
2245 | if (wbio->bi_end_io) { |
2246 | atomic_inc(&conf->mirrors[d].rdev->nr_pending); | |
aa8b57aa | 2247 | md_sync_acct(conf->mirrors[d].rdev->bdev, bio_sectors(wbio)); |
24afd80d N |
2248 | generic_make_request(wbio); |
2249 | } | |
0eb25bb0 | 2250 | if (wbio2) { |
24afd80d N |
2251 | atomic_inc(&conf->mirrors[d].replacement->nr_pending); |
2252 | md_sync_acct(conf->mirrors[d].replacement->bdev, | |
aa8b57aa | 2253 | bio_sectors(wbio2)); |
24afd80d N |
2254 | generic_make_request(wbio2); |
2255 | } | |
1da177e4 LT |
2256 | } |
2257 | ||
1e50915f RB |
2258 | /* |
2259 | * Used by fix_read_error() to decay the per rdev read_errors. | |
2260 | * We halve the read error count for every hour that has elapsed | |
2261 | * since the last recorded read error. | |
2262 | * | |
2263 | */ | |
fd01b88c | 2264 | static void check_decay_read_errors(struct mddev *mddev, struct md_rdev *rdev) |
1e50915f | 2265 | { |
0e3ef49e | 2266 | long cur_time_mon; |
1e50915f RB |
2267 | unsigned long hours_since_last; |
2268 | unsigned int read_errors = atomic_read(&rdev->read_errors); | |
2269 | ||
0e3ef49e | 2270 | cur_time_mon = ktime_get_seconds(); |
1e50915f | 2271 | |
0e3ef49e | 2272 | if (rdev->last_read_error == 0) { |
1e50915f RB |
2273 | /* first time we've seen a read error */ |
2274 | rdev->last_read_error = cur_time_mon; | |
2275 | return; | |
2276 | } | |
2277 | ||
0e3ef49e AB |
2278 | hours_since_last = (long)(cur_time_mon - |
2279 | rdev->last_read_error) / 3600; | |
1e50915f RB |
2280 | |
2281 | rdev->last_read_error = cur_time_mon; | |
2282 | ||
2283 | /* | |
2284 | * if hours_since_last is > the number of bits in read_errors | |
2285 | * just set read errors to 0. We do this to avoid | |
2286 | * overflowing the shift of read_errors by hours_since_last. | |
2287 | */ | |
2288 | if (hours_since_last >= 8 * sizeof(read_errors)) | |
2289 | atomic_set(&rdev->read_errors, 0); | |
2290 | else | |
2291 | atomic_set(&rdev->read_errors, read_errors >> hours_since_last); | |
2292 | } | |
2293 | ||
3cb03002 | 2294 | static int r10_sync_page_io(struct md_rdev *rdev, sector_t sector, |
58c54fcc N |
2295 | int sectors, struct page *page, int rw) |
2296 | { | |
2297 | sector_t first_bad; | |
2298 | int bad_sectors; | |
2299 | ||
2300 | if (is_badblock(rdev, sector, sectors, &first_bad, &bad_sectors) | |
2301 | && (rw == READ || test_bit(WriteErrorSeen, &rdev->flags))) | |
2302 | return -1; | |
796a5cf0 | 2303 | if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) |
58c54fcc N |
2304 | /* success */ |
2305 | return 1; | |
b7044d41 | 2306 | if (rw == WRITE) { |
58c54fcc | 2307 | set_bit(WriteErrorSeen, &rdev->flags); |
b7044d41 N |
2308 | if (!test_and_set_bit(WantReplacement, &rdev->flags)) |
2309 | set_bit(MD_RECOVERY_NEEDED, | |
2310 | &rdev->mddev->recovery); | |
2311 | } | |
58c54fcc N |
2312 | /* need to record an error - either for the block or the device */ |
2313 | if (!rdev_set_badblocks(rdev, sector, sectors, 0)) | |
2314 | md_error(rdev->mddev, rdev); | |
2315 | return 0; | |
2316 | } | |
2317 | ||
1da177e4 LT |
2318 | /* |
2319 | * This is a kernel thread which: | |
2320 | * | |
2321 | * 1. Retries failed read operations on working mirrors. | |
2322 | * 2. Updates the raid superblock when problems encounter. | |
6814d536 | 2323 | * 3. Performs writes following reads for array synchronising. |
1da177e4 LT |
2324 | */ |
2325 | ||
e879a879 | 2326 | static void fix_read_error(struct r10conf *conf, struct mddev *mddev, struct r10bio *r10_bio) |
6814d536 N |
2327 | { |
2328 | int sect = 0; /* Offset from r10_bio->sector */ | |
2329 | int sectors = r10_bio->sectors; | |
3cb03002 | 2330 | struct md_rdev*rdev; |
1e50915f | 2331 | int max_read_errors = atomic_read(&mddev->max_corr_read_errors); |
0544a21d | 2332 | int d = r10_bio->devs[r10_bio->read_slot].devnum; |
1e50915f | 2333 | |
7c4e06ff N |
2334 | /* still own a reference to this rdev, so it cannot |
2335 | * have been cleared recently. | |
2336 | */ | |
2337 | rdev = conf->mirrors[d].rdev; | |
1e50915f | 2338 | |
7c4e06ff N |
2339 | if (test_bit(Faulty, &rdev->flags)) |
2340 | /* drive has already been failed, just ignore any | |
2341 | more fix_read_error() attempts */ | |
2342 | return; | |
1e50915f | 2343 | |
7c4e06ff N |
2344 | check_decay_read_errors(mddev, rdev); |
2345 | atomic_inc(&rdev->read_errors); | |
2346 | if (atomic_read(&rdev->read_errors) > max_read_errors) { | |
2347 | char b[BDEVNAME_SIZE]; | |
2348 | bdevname(rdev->bdev, b); | |
1e50915f | 2349 | |
08464e09 N |
2350 | pr_notice("md/raid10:%s: %s: Raid device exceeded read_error threshold [cur %d:max %d]\n", |
2351 | mdname(mddev), b, | |
2352 | atomic_read(&rdev->read_errors), max_read_errors); | |
2353 | pr_notice("md/raid10:%s: %s: Failing raid device\n", | |
2354 | mdname(mddev), b); | |
d683c8e0 | 2355 | md_error(mddev, rdev); |
fae8cc5e | 2356 | r10_bio->devs[r10_bio->read_slot].bio = IO_BLOCKED; |
7c4e06ff | 2357 | return; |
1e50915f | 2358 | } |
1e50915f | 2359 | |
6814d536 N |
2360 | while(sectors) { |
2361 | int s = sectors; | |
2362 | int sl = r10_bio->read_slot; | |
2363 | int success = 0; | |
2364 | int start; | |
2365 | ||
2366 | if (s > (PAGE_SIZE>>9)) | |
2367 | s = PAGE_SIZE >> 9; | |
2368 | ||
2369 | rcu_read_lock(); | |
2370 | do { | |
8dbed5ce N |
2371 | sector_t first_bad; |
2372 | int bad_sectors; | |
2373 | ||
0544a21d | 2374 | d = r10_bio->devs[sl].devnum; |
6814d536 N |
2375 | rdev = rcu_dereference(conf->mirrors[d].rdev); |
2376 | if (rdev && | |
8dbed5ce | 2377 | test_bit(In_sync, &rdev->flags) && |
f5b67ae8 | 2378 | !test_bit(Faulty, &rdev->flags) && |
8dbed5ce N |
2379 | is_badblock(rdev, r10_bio->devs[sl].addr + sect, s, |
2380 | &first_bad, &bad_sectors) == 0) { | |
6814d536 N |
2381 | atomic_inc(&rdev->nr_pending); |
2382 | rcu_read_unlock(); | |
2b193363 | 2383 | success = sync_page_io(rdev, |
6814d536 | 2384 | r10_bio->devs[sl].addr + |
ccebd4c4 | 2385 | sect, |
6814d536 | 2386 | s<<9, |
796a5cf0 MC |
2387 | conf->tmppage, |
2388 | REQ_OP_READ, 0, false); | |
6814d536 N |
2389 | rdev_dec_pending(rdev, mddev); |
2390 | rcu_read_lock(); | |
2391 | if (success) | |
2392 | break; | |
2393 | } | |
2394 | sl++; | |
2395 | if (sl == conf->copies) | |
2396 | sl = 0; | |
2397 | } while (!success && sl != r10_bio->read_slot); | |
2398 | rcu_read_unlock(); | |
2399 | ||
2400 | if (!success) { | |
58c54fcc N |
2401 | /* Cannot read from anywhere, just mark the block |
2402 | * as bad on the first device to discourage future | |
2403 | * reads. | |
2404 | */ | |
6814d536 | 2405 | int dn = r10_bio->devs[r10_bio->read_slot].devnum; |
58c54fcc N |
2406 | rdev = conf->mirrors[dn].rdev; |
2407 | ||
2408 | if (!rdev_set_badblocks( | |
2409 | rdev, | |
2410 | r10_bio->devs[r10_bio->read_slot].addr | |
2411 | + sect, | |
fae8cc5e | 2412 | s, 0)) { |
58c54fcc | 2413 | md_error(mddev, rdev); |
fae8cc5e N |
2414 | r10_bio->devs[r10_bio->read_slot].bio |
2415 | = IO_BLOCKED; | |
2416 | } | |
6814d536 N |
2417 | break; |
2418 | } | |
2419 | ||
2420 | start = sl; | |
2421 | /* write it back and re-read */ | |
2422 | rcu_read_lock(); | |
2423 | while (sl != r10_bio->read_slot) { | |
67b8dc4b | 2424 | char b[BDEVNAME_SIZE]; |
0544a21d | 2425 | |
6814d536 N |
2426 | if (sl==0) |
2427 | sl = conf->copies; | |
2428 | sl--; | |
2429 | d = r10_bio->devs[sl].devnum; | |
2430 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 | 2431 | if (!rdev || |
f5b67ae8 | 2432 | test_bit(Faulty, &rdev->flags) || |
1294b9c9 N |
2433 | !test_bit(In_sync, &rdev->flags)) |
2434 | continue; | |
2435 | ||
2436 | atomic_inc(&rdev->nr_pending); | |
2437 | rcu_read_unlock(); | |
58c54fcc N |
2438 | if (r10_sync_page_io(rdev, |
2439 | r10_bio->devs[sl].addr + | |
2440 | sect, | |
055d3747 | 2441 | s, conf->tmppage, WRITE) |
1294b9c9 N |
2442 | == 0) { |
2443 | /* Well, this device is dead */ | |
08464e09 N |
2444 | pr_notice("md/raid10:%s: read correction write failed (%d sectors at %llu on %s)\n", |
2445 | mdname(mddev), s, | |
2446 | (unsigned long long)( | |
2447 | sect + | |
2448 | choose_data_offset(r10_bio, | |
2449 | rdev)), | |
2450 | bdevname(rdev->bdev, b)); | |
2451 | pr_notice("md/raid10:%s: %s: failing drive\n", | |
2452 | mdname(mddev), | |
2453 | bdevname(rdev->bdev, b)); | |
6814d536 | 2454 | } |
1294b9c9 N |
2455 | rdev_dec_pending(rdev, mddev); |
2456 | rcu_read_lock(); | |
6814d536 N |
2457 | } |
2458 | sl = start; | |
2459 | while (sl != r10_bio->read_slot) { | |
1294b9c9 | 2460 | char b[BDEVNAME_SIZE]; |
0544a21d | 2461 | |
6814d536 N |
2462 | if (sl==0) |
2463 | sl = conf->copies; | |
2464 | sl--; | |
2465 | d = r10_bio->devs[sl].devnum; | |
2466 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
1294b9c9 | 2467 | if (!rdev || |
f5b67ae8 | 2468 | test_bit(Faulty, &rdev->flags) || |
1294b9c9 N |
2469 | !test_bit(In_sync, &rdev->flags)) |
2470 | continue; | |
6814d536 | 2471 | |
1294b9c9 N |
2472 | atomic_inc(&rdev->nr_pending); |
2473 | rcu_read_unlock(); | |
58c54fcc N |
2474 | switch (r10_sync_page_io(rdev, |
2475 | r10_bio->devs[sl].addr + | |
2476 | sect, | |
055d3747 | 2477 | s, conf->tmppage, |
58c54fcc N |
2478 | READ)) { |
2479 | case 0: | |
1294b9c9 | 2480 | /* Well, this device is dead */ |
08464e09 | 2481 | pr_notice("md/raid10:%s: unable to read back corrected sectors (%d sectors at %llu on %s)\n", |
1294b9c9 N |
2482 | mdname(mddev), s, |
2483 | (unsigned long long)( | |
f8c9e74f N |
2484 | sect + |
2485 | choose_data_offset(r10_bio, rdev)), | |
1294b9c9 | 2486 | bdevname(rdev->bdev, b)); |
08464e09 | 2487 | pr_notice("md/raid10:%s: %s: failing drive\n", |
1294b9c9 N |
2488 | mdname(mddev), |
2489 | bdevname(rdev->bdev, b)); | |
58c54fcc N |
2490 | break; |
2491 | case 1: | |
08464e09 | 2492 | pr_info("md/raid10:%s: read error corrected (%d sectors at %llu on %s)\n", |
1294b9c9 N |
2493 | mdname(mddev), s, |
2494 | (unsigned long long)( | |
f8c9e74f N |
2495 | sect + |
2496 | choose_data_offset(r10_bio, rdev)), | |
1294b9c9 N |
2497 | bdevname(rdev->bdev, b)); |
2498 | atomic_add(s, &rdev->corrected_errors); | |
6814d536 | 2499 | } |
1294b9c9 N |
2500 | |
2501 | rdev_dec_pending(rdev, mddev); | |
2502 | rcu_read_lock(); | |
6814d536 N |
2503 | } |
2504 | rcu_read_unlock(); | |
2505 | ||
2506 | sectors -= s; | |
2507 | sect += s; | |
2508 | } | |
2509 | } | |
2510 | ||
9f2c9d12 | 2511 | static int narrow_write_error(struct r10bio *r10_bio, int i) |
bd870a16 N |
2512 | { |
2513 | struct bio *bio = r10_bio->master_bio; | |
fd01b88c | 2514 | struct mddev *mddev = r10_bio->mddev; |
e879a879 | 2515 | struct r10conf *conf = mddev->private; |
3cb03002 | 2516 | struct md_rdev *rdev = conf->mirrors[r10_bio->devs[i].devnum].rdev; |
bd870a16 N |
2517 | /* bio has the data to be written to slot 'i' where |
2518 | * we just recently had a write error. | |
2519 | * We repeatedly clone the bio and trim down to one block, | |
2520 | * then try the write. Where the write fails we record | |
2521 | * a bad block. | |
2522 | * It is conceivable that the bio doesn't exactly align with | |
2523 | * blocks. We must handle this. | |
2524 | * | |
2525 | * We currently own a reference to the rdev. | |
2526 | */ | |
2527 | ||
2528 | int block_sectors; | |
2529 | sector_t sector; | |
2530 | int sectors; | |
2531 | int sect_to_write = r10_bio->sectors; | |
2532 | int ok = 1; | |
2533 | ||
2534 | if (rdev->badblocks.shift < 0) | |
2535 | return 0; | |
2536 | ||
f04ebb0b N |
2537 | block_sectors = roundup(1 << rdev->badblocks.shift, |
2538 | bdev_logical_block_size(rdev->bdev) >> 9); | |
bd870a16 N |
2539 | sector = r10_bio->sector; |
2540 | sectors = ((r10_bio->sector + block_sectors) | |
2541 | & ~(sector_t)(block_sectors - 1)) | |
2542 | - sector; | |
2543 | ||
2544 | while (sect_to_write) { | |
2545 | struct bio *wbio; | |
27028626 | 2546 | sector_t wsector; |
bd870a16 N |
2547 | if (sectors > sect_to_write) |
2548 | sectors = sect_to_write; | |
2549 | /* Write at 'sector' for 'sectors' */ | |
d7a10308 | 2550 | wbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); |
4f024f37 | 2551 | bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors); |
27028626 TM |
2552 | wsector = r10_bio->devs[i].addr + (sector - r10_bio->sector); |
2553 | wbio->bi_iter.bi_sector = wsector + | |
2554 | choose_data_offset(r10_bio, rdev); | |
bd870a16 | 2555 | wbio->bi_bdev = rdev->bdev; |
796a5cf0 | 2556 | bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); |
4e49ea4a MC |
2557 | |
2558 | if (submit_bio_wait(wbio) < 0) | |
bd870a16 | 2559 | /* Failure! */ |
27028626 | 2560 | ok = rdev_set_badblocks(rdev, wsector, |
bd870a16 N |
2561 | sectors, 0) |
2562 | && ok; | |
2563 | ||
2564 | bio_put(wbio); | |
2565 | sect_to_write -= sectors; | |
2566 | sector += sectors; | |
2567 | sectors = block_sectors; | |
2568 | } | |
2569 | return ok; | |
2570 | } | |
2571 | ||
9f2c9d12 | 2572 | static void handle_read_error(struct mddev *mddev, struct r10bio *r10_bio) |
560f8e55 N |
2573 | { |
2574 | int slot = r10_bio->read_slot; | |
560f8e55 | 2575 | struct bio *bio; |
e879a879 | 2576 | struct r10conf *conf = mddev->private; |
abbf098e | 2577 | struct md_rdev *rdev = r10_bio->devs[slot].rdev; |
109e3765 N |
2578 | dev_t bio_dev; |
2579 | sector_t bio_last_sector; | |
560f8e55 N |
2580 | |
2581 | /* we got a read error. Maybe the drive is bad. Maybe just | |
2582 | * the block and we can fix it. | |
2583 | * We freeze all other IO, and try reading the block from | |
2584 | * other devices. When we find one, we re-write | |
2585 | * and check it that fixes the read error. | |
2586 | * This is all done synchronously while the array is | |
2587 | * frozen. | |
2588 | */ | |
fae8cc5e | 2589 | bio = r10_bio->devs[slot].bio; |
109e3765 N |
2590 | bio_dev = bio->bi_bdev->bd_dev; |
2591 | bio_last_sector = r10_bio->devs[slot].addr + rdev->data_offset + r10_bio->sectors; | |
fae8cc5e N |
2592 | bio_put(bio); |
2593 | r10_bio->devs[slot].bio = NULL; | |
2594 | ||
8d3ca83d N |
2595 | if (mddev->ro) |
2596 | r10_bio->devs[slot].bio = IO_BLOCKED; | |
2597 | else if (!test_bit(FailFast, &rdev->flags)) { | |
e2d59925 | 2598 | freeze_array(conf, 1); |
560f8e55 N |
2599 | fix_read_error(conf, mddev, r10_bio); |
2600 | unfreeze_array(conf); | |
fae8cc5e | 2601 | } else |
8d3ca83d | 2602 | md_error(mddev, rdev); |
fae8cc5e | 2603 | |
abbf098e | 2604 | rdev_dec_pending(rdev, mddev); |
545250f2 N |
2605 | allow_barrier(conf); |
2606 | r10_bio->state = 0; | |
2607 | raid10_read_request(mddev, r10_bio->master_bio, r10_bio); | |
560f8e55 N |
2608 | } |
2609 | ||
e879a879 | 2610 | static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio) |
749c55e9 N |
2611 | { |
2612 | /* Some sort of write request has finished and it | |
2613 | * succeeded in writing where we thought there was a | |
2614 | * bad block. So forget the bad block. | |
1a0b7cd8 N |
2615 | * Or possibly if failed and we need to record |
2616 | * a bad block. | |
749c55e9 N |
2617 | */ |
2618 | int m; | |
3cb03002 | 2619 | struct md_rdev *rdev; |
749c55e9 N |
2620 | |
2621 | if (test_bit(R10BIO_IsSync, &r10_bio->state) || | |
2622 | test_bit(R10BIO_IsRecover, &r10_bio->state)) { | |
1a0b7cd8 N |
2623 | for (m = 0; m < conf->copies; m++) { |
2624 | int dev = r10_bio->devs[m].devnum; | |
2625 | rdev = conf->mirrors[dev].rdev; | |
2626 | if (r10_bio->devs[m].bio == NULL) | |
2627 | continue; | |
4e4cbee9 | 2628 | if (!r10_bio->devs[m].bio->bi_status) { |
749c55e9 N |
2629 | rdev_clear_badblocks( |
2630 | rdev, | |
2631 | r10_bio->devs[m].addr, | |
c6563a8c | 2632 | r10_bio->sectors, 0); |
1a0b7cd8 N |
2633 | } else { |
2634 | if (!rdev_set_badblocks( | |
2635 | rdev, | |
2636 | r10_bio->devs[m].addr, | |
2637 | r10_bio->sectors, 0)) | |
2638 | md_error(conf->mddev, rdev); | |
749c55e9 | 2639 | } |
9ad1aefc N |
2640 | rdev = conf->mirrors[dev].replacement; |
2641 | if (r10_bio->devs[m].repl_bio == NULL) | |
2642 | continue; | |
4246a0b6 | 2643 | |
4e4cbee9 | 2644 | if (!r10_bio->devs[m].repl_bio->bi_status) { |
9ad1aefc N |
2645 | rdev_clear_badblocks( |
2646 | rdev, | |
2647 | r10_bio->devs[m].addr, | |
c6563a8c | 2648 | r10_bio->sectors, 0); |
9ad1aefc N |
2649 | } else { |
2650 | if (!rdev_set_badblocks( | |
2651 | rdev, | |
2652 | r10_bio->devs[m].addr, | |
2653 | r10_bio->sectors, 0)) | |
2654 | md_error(conf->mddev, rdev); | |
2655 | } | |
1a0b7cd8 | 2656 | } |
749c55e9 N |
2657 | put_buf(r10_bio); |
2658 | } else { | |
95af587e | 2659 | bool fail = false; |
bd870a16 N |
2660 | for (m = 0; m < conf->copies; m++) { |
2661 | int dev = r10_bio->devs[m].devnum; | |
2662 | struct bio *bio = r10_bio->devs[m].bio; | |
2663 | rdev = conf->mirrors[dev].rdev; | |
2664 | if (bio == IO_MADE_GOOD) { | |
749c55e9 N |
2665 | rdev_clear_badblocks( |
2666 | rdev, | |
2667 | r10_bio->devs[m].addr, | |
c6563a8c | 2668 | r10_bio->sectors, 0); |
749c55e9 | 2669 | rdev_dec_pending(rdev, conf->mddev); |
4e4cbee9 | 2670 | } else if (bio != NULL && bio->bi_status) { |
95af587e | 2671 | fail = true; |
bd870a16 N |
2672 | if (!narrow_write_error(r10_bio, m)) { |
2673 | md_error(conf->mddev, rdev); | |
2674 | set_bit(R10BIO_Degraded, | |
2675 | &r10_bio->state); | |
2676 | } | |
2677 | rdev_dec_pending(rdev, conf->mddev); | |
749c55e9 | 2678 | } |
475b0321 N |
2679 | bio = r10_bio->devs[m].repl_bio; |
2680 | rdev = conf->mirrors[dev].replacement; | |
4ca40c2c | 2681 | if (rdev && bio == IO_MADE_GOOD) { |
475b0321 N |
2682 | rdev_clear_badblocks( |
2683 | rdev, | |
2684 | r10_bio->devs[m].addr, | |
c6563a8c | 2685 | r10_bio->sectors, 0); |
475b0321 N |
2686 | rdev_dec_pending(rdev, conf->mddev); |
2687 | } | |
bd870a16 | 2688 | } |
95af587e N |
2689 | if (fail) { |
2690 | spin_lock_irq(&conf->device_lock); | |
2691 | list_add(&r10_bio->retry_list, &conf->bio_end_io_list); | |
23ddba80 | 2692 | conf->nr_queued++; |
95af587e | 2693 | spin_unlock_irq(&conf->device_lock); |
cf25ae78 GJ |
2694 | /* |
2695 | * In case freeze_array() is waiting for condition | |
2696 | * nr_pending == nr_queued + extra to be true. | |
2697 | */ | |
2698 | wake_up(&conf->wait_barrier); | |
95af587e | 2699 | md_wakeup_thread(conf->mddev->thread); |
c340702c N |
2700 | } else { |
2701 | if (test_bit(R10BIO_WriteError, | |
2702 | &r10_bio->state)) | |
2703 | close_write(r10_bio); | |
95af587e | 2704 | raid_end_bio_io(r10_bio); |
c340702c | 2705 | } |
749c55e9 N |
2706 | } |
2707 | } | |
2708 | ||
4ed8731d | 2709 | static void raid10d(struct md_thread *thread) |
1da177e4 | 2710 | { |
4ed8731d | 2711 | struct mddev *mddev = thread->mddev; |
9f2c9d12 | 2712 | struct r10bio *r10_bio; |
1da177e4 | 2713 | unsigned long flags; |
e879a879 | 2714 | struct r10conf *conf = mddev->private; |
1da177e4 | 2715 | struct list_head *head = &conf->retry_list; |
e1dfa0a2 | 2716 | struct blk_plug plug; |
1da177e4 LT |
2717 | |
2718 | md_check_recovery(mddev); | |
1da177e4 | 2719 | |
95af587e | 2720 | if (!list_empty_careful(&conf->bio_end_io_list) && |
2953079c | 2721 | !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
95af587e N |
2722 | LIST_HEAD(tmp); |
2723 | spin_lock_irqsave(&conf->device_lock, flags); | |
2953079c | 2724 | if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { |
23ddba80 SL |
2725 | while (!list_empty(&conf->bio_end_io_list)) { |
2726 | list_move(conf->bio_end_io_list.prev, &tmp); | |
2727 | conf->nr_queued--; | |
2728 | } | |
95af587e N |
2729 | } |
2730 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
2731 | while (!list_empty(&tmp)) { | |
a452744b MP |
2732 | r10_bio = list_first_entry(&tmp, struct r10bio, |
2733 | retry_list); | |
95af587e | 2734 | list_del(&r10_bio->retry_list); |
c340702c N |
2735 | if (mddev->degraded) |
2736 | set_bit(R10BIO_Degraded, &r10_bio->state); | |
2737 | ||
2738 | if (test_bit(R10BIO_WriteError, | |
2739 | &r10_bio->state)) | |
2740 | close_write(r10_bio); | |
95af587e N |
2741 | raid_end_bio_io(r10_bio); |
2742 | } | |
2743 | } | |
2744 | ||
e1dfa0a2 | 2745 | blk_start_plug(&plug); |
1da177e4 | 2746 | for (;;) { |
6cce3b23 | 2747 | |
0021b7bc | 2748 | flush_pending_writes(conf); |
6cce3b23 | 2749 | |
a35e63ef N |
2750 | spin_lock_irqsave(&conf->device_lock, flags); |
2751 | if (list_empty(head)) { | |
2752 | spin_unlock_irqrestore(&conf->device_lock, flags); | |
1da177e4 | 2753 | break; |
a35e63ef | 2754 | } |
9f2c9d12 | 2755 | r10_bio = list_entry(head->prev, struct r10bio, retry_list); |
1da177e4 | 2756 | list_del(head->prev); |
4443ae10 | 2757 | conf->nr_queued--; |
1da177e4 LT |
2758 | spin_unlock_irqrestore(&conf->device_lock, flags); |
2759 | ||
2760 | mddev = r10_bio->mddev; | |
070ec55d | 2761 | conf = mddev->private; |
bd870a16 N |
2762 | if (test_bit(R10BIO_MadeGood, &r10_bio->state) || |
2763 | test_bit(R10BIO_WriteError, &r10_bio->state)) | |
749c55e9 | 2764 | handle_write_completed(conf, r10_bio); |
3ea7daa5 N |
2765 | else if (test_bit(R10BIO_IsReshape, &r10_bio->state)) |
2766 | reshape_request_write(mddev, r10_bio); | |
749c55e9 | 2767 | else if (test_bit(R10BIO_IsSync, &r10_bio->state)) |
1da177e4 | 2768 | sync_request_write(mddev, r10_bio); |
7eaceacc | 2769 | else if (test_bit(R10BIO_IsRecover, &r10_bio->state)) |
1da177e4 | 2770 | recovery_request_write(mddev, r10_bio); |
856e08e2 | 2771 | else if (test_bit(R10BIO_ReadError, &r10_bio->state)) |
560f8e55 | 2772 | handle_read_error(mddev, r10_bio); |
fc9977dd N |
2773 | else |
2774 | WARN_ON_ONCE(1); | |
560f8e55 | 2775 | |
1d9d5241 | 2776 | cond_resched(); |
2953079c | 2777 | if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) |
de393cde | 2778 | md_check_recovery(mddev); |
1da177e4 | 2779 | } |
e1dfa0a2 | 2780 | blk_finish_plug(&plug); |
1da177e4 LT |
2781 | } |
2782 | ||
e879a879 | 2783 | static int init_resync(struct r10conf *conf) |
1da177e4 LT |
2784 | { |
2785 | int buffs; | |
69335ef3 | 2786 | int i; |
1da177e4 LT |
2787 | |
2788 | buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; | |
b6385483 | 2789 | BUG_ON(conf->r10buf_pool); |
69335ef3 | 2790 | conf->have_replacement = 0; |
5cf00fcd | 2791 | for (i = 0; i < conf->geo.raid_disks; i++) |
69335ef3 N |
2792 | if (conf->mirrors[i].replacement) |
2793 | conf->have_replacement = 1; | |
1da177e4 LT |
2794 | conf->r10buf_pool = mempool_create(buffs, r10buf_pool_alloc, r10buf_pool_free, conf); |
2795 | if (!conf->r10buf_pool) | |
2796 | return -ENOMEM; | |
2797 | conf->next_resync = 0; | |
2798 | return 0; | |
2799 | } | |
2800 | ||
2801 | /* | |
2802 | * perform a "sync" on one "block" | |
2803 | * | |
2804 | * We need to make sure that no normal I/O request - particularly write | |
2805 | * requests - conflict with active sync requests. | |
2806 | * | |
2807 | * This is achieved by tracking pending requests and a 'barrier' concept | |
2808 | * that can be installed to exclude normal IO requests. | |
2809 | * | |
2810 | * Resync and recovery are handled very differently. | |
2811 | * We differentiate by looking at MD_RECOVERY_SYNC in mddev->recovery. | |
2812 | * | |
2813 | * For resync, we iterate over virtual addresses, read all copies, | |
2814 | * and update if there are differences. If only one copy is live, | |
2815 | * skip it. | |
2816 | * For recovery, we iterate over physical addresses, read a good | |
2817 | * value for each non-in_sync drive, and over-write. | |
2818 | * | |
2819 | * So, for recovery we may have several outstanding complex requests for a | |
2820 | * given address, one for each out-of-sync device. We model this by allocating | |
2821 | * a number of r10_bio structures, one for each out-of-sync device. | |
2822 | * As we setup these structures, we collect all bio's together into a list | |
2823 | * which we then process collectively to add pages, and then process again | |
2824 | * to pass to generic_make_request. | |
2825 | * | |
2826 | * The r10_bio structures are linked using a borrowed master_bio pointer. | |
2827 | * This link is counted in ->remaining. When the r10_bio that points to NULL | |
2828 | * has its remaining count decremented to 0, the whole complex operation | |
2829 | * is complete. | |
2830 | * | |
2831 | */ | |
2832 | ||
849674e4 | 2833 | static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, |
09314799 | 2834 | int *skipped) |
1da177e4 | 2835 | { |
e879a879 | 2836 | struct r10conf *conf = mddev->private; |
9f2c9d12 | 2837 | struct r10bio *r10_bio; |
1da177e4 LT |
2838 | struct bio *biolist = NULL, *bio; |
2839 | sector_t max_sector, nr_sectors; | |
1da177e4 | 2840 | int i; |
6cce3b23 | 2841 | int max_sync; |
57dab0bd | 2842 | sector_t sync_blocks; |
1da177e4 LT |
2843 | sector_t sectors_skipped = 0; |
2844 | int chunks_skipped = 0; | |
5cf00fcd | 2845 | sector_t chunk_mask = conf->geo.chunk_mask; |
022e510f | 2846 | int page_idx = 0; |
1da177e4 LT |
2847 | |
2848 | if (!conf->r10buf_pool) | |
2849 | if (init_resync(conf)) | |
57afd89f | 2850 | return 0; |
1da177e4 | 2851 | |
7e83ccbe MW |
2852 | /* |
2853 | * Allow skipping a full rebuild for incremental assembly | |
2854 | * of a clean array, like RAID1 does. | |
2855 | */ | |
2856 | if (mddev->bitmap == NULL && | |
2857 | mddev->recovery_cp == MaxSector && | |
13765120 N |
2858 | mddev->reshape_position == MaxSector && |
2859 | !test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && | |
7e83ccbe | 2860 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && |
13765120 | 2861 | !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7e83ccbe MW |
2862 | conf->fullsync == 0) { |
2863 | *skipped = 1; | |
13765120 | 2864 | return mddev->dev_sectors - sector_nr; |
7e83ccbe MW |
2865 | } |
2866 | ||
1da177e4 | 2867 | skipped: |
58c0fed4 | 2868 | max_sector = mddev->dev_sectors; |
3ea7daa5 N |
2869 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
2870 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1da177e4 LT |
2871 | max_sector = mddev->resync_max_sectors; |
2872 | if (sector_nr >= max_sector) { | |
6cce3b23 N |
2873 | /* If we aborted, we need to abort the |
2874 | * sync on the 'current' bitmap chucks (there can | |
2875 | * be several when recovering multiple devices). | |
2876 | * as we may have started syncing it but not finished. | |
2877 | * We can find the current address in | |
2878 | * mddev->curr_resync, but for recovery, | |
2879 | * we need to convert that to several | |
2880 | * virtual addresses. | |
2881 | */ | |
3ea7daa5 N |
2882 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) { |
2883 | end_reshape(conf); | |
b3968552 | 2884 | close_sync(conf); |
3ea7daa5 N |
2885 | return 0; |
2886 | } | |
2887 | ||
6cce3b23 N |
2888 | if (mddev->curr_resync < max_sector) { /* aborted */ |
2889 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2890 | bitmap_end_sync(mddev->bitmap, mddev->curr_resync, | |
2891 | &sync_blocks, 1); | |
5cf00fcd | 2892 | else for (i = 0; i < conf->geo.raid_disks; i++) { |
6cce3b23 N |
2893 | sector_t sect = |
2894 | raid10_find_virt(conf, mddev->curr_resync, i); | |
2895 | bitmap_end_sync(mddev->bitmap, sect, | |
2896 | &sync_blocks, 1); | |
2897 | } | |
9ad1aefc N |
2898 | } else { |
2899 | /* completed sync */ | |
2900 | if ((!mddev->bitmap || conf->fullsync) | |
2901 | && conf->have_replacement | |
2902 | && test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
2903 | /* Completed a full sync so the replacements | |
2904 | * are now fully recovered. | |
2905 | */ | |
f90145f3 N |
2906 | rcu_read_lock(); |
2907 | for (i = 0; i < conf->geo.raid_disks; i++) { | |
2908 | struct md_rdev *rdev = | |
2909 | rcu_dereference(conf->mirrors[i].replacement); | |
2910 | if (rdev) | |
2911 | rdev->recovery_offset = MaxSector; | |
2912 | } | |
2913 | rcu_read_unlock(); | |
9ad1aefc | 2914 | } |
6cce3b23 | 2915 | conf->fullsync = 0; |
9ad1aefc | 2916 | } |
6cce3b23 | 2917 | bitmap_close_sync(mddev->bitmap); |
1da177e4 | 2918 | close_sync(conf); |
57afd89f | 2919 | *skipped = 1; |
1da177e4 LT |
2920 | return sectors_skipped; |
2921 | } | |
3ea7daa5 N |
2922 | |
2923 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
2924 | return reshape_request(mddev, sector_nr, skipped); | |
2925 | ||
5cf00fcd | 2926 | if (chunks_skipped >= conf->geo.raid_disks) { |
1da177e4 LT |
2927 | /* if there has been nothing to do on any drive, |
2928 | * then there is nothing to do at all.. | |
2929 | */ | |
57afd89f N |
2930 | *skipped = 1; |
2931 | return (max_sector - sector_nr) + sectors_skipped; | |
1da177e4 LT |
2932 | } |
2933 | ||
c6207277 N |
2934 | if (max_sector > mddev->resync_max) |
2935 | max_sector = mddev->resync_max; /* Don't do IO beyond here */ | |
2936 | ||
1da177e4 LT |
2937 | /* make sure whole request will fit in a chunk - if chunks |
2938 | * are meaningful | |
2939 | */ | |
5cf00fcd N |
2940 | if (conf->geo.near_copies < conf->geo.raid_disks && |
2941 | max_sector > (sector_nr | chunk_mask)) | |
2942 | max_sector = (sector_nr | chunk_mask) + 1; | |
1da177e4 | 2943 | |
7ac50447 TM |
2944 | /* |
2945 | * If there is non-resync activity waiting for a turn, then let it | |
2946 | * though before starting on this new sync request. | |
2947 | */ | |
2948 | if (conf->nr_waiting) | |
2949 | schedule_timeout_uninterruptible(1); | |
2950 | ||
1da177e4 LT |
2951 | /* Again, very different code for resync and recovery. |
2952 | * Both must result in an r10bio with a list of bios that | |
2953 | * have bi_end_io, bi_sector, bi_bdev set, | |
2954 | * and bi_private set to the r10bio. | |
2955 | * For recovery, we may actually create several r10bios | |
2956 | * with 2 bios in each, that correspond to the bios in the main one. | |
2957 | * In this case, the subordinate r10bios link back through a | |
2958 | * borrowed master_bio pointer, and the counter in the master | |
2959 | * includes a ref from each subordinate. | |
2960 | */ | |
2961 | /* First, we decide what to do and set ->bi_end_io | |
2962 | * To end_sync_read if we want to read, and | |
2963 | * end_sync_write if we will want to write. | |
2964 | */ | |
2965 | ||
6cce3b23 | 2966 | max_sync = RESYNC_PAGES << (PAGE_SHIFT-9); |
1da177e4 LT |
2967 | if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
2968 | /* recovery... the complicated one */ | |
e875ecea | 2969 | int j; |
1da177e4 LT |
2970 | r10_bio = NULL; |
2971 | ||
5cf00fcd | 2972 | for (i = 0 ; i < conf->geo.raid_disks; i++) { |
ab9d47e9 | 2973 | int still_degraded; |
9f2c9d12 | 2974 | struct r10bio *rb2; |
ab9d47e9 N |
2975 | sector_t sect; |
2976 | int must_sync; | |
e875ecea | 2977 | int any_working; |
dc280d98 | 2978 | struct raid10_info *mirror = &conf->mirrors[i]; |
f90145f3 | 2979 | struct md_rdev *mrdev, *mreplace; |
24afd80d | 2980 | |
f90145f3 N |
2981 | rcu_read_lock(); |
2982 | mrdev = rcu_dereference(mirror->rdev); | |
2983 | mreplace = rcu_dereference(mirror->replacement); | |
2984 | ||
2985 | if ((mrdev == NULL || | |
f5b67ae8 | 2986 | test_bit(Faulty, &mrdev->flags) || |
f90145f3 N |
2987 | test_bit(In_sync, &mrdev->flags)) && |
2988 | (mreplace == NULL || | |
2989 | test_bit(Faulty, &mreplace->flags))) { | |
2990 | rcu_read_unlock(); | |
ab9d47e9 | 2991 | continue; |
f90145f3 | 2992 | } |
1da177e4 | 2993 | |
ab9d47e9 N |
2994 | still_degraded = 0; |
2995 | /* want to reconstruct this device */ | |
2996 | rb2 = r10_bio; | |
2997 | sect = raid10_find_virt(conf, sector_nr, i); | |
fc448a18 N |
2998 | if (sect >= mddev->resync_max_sectors) { |
2999 | /* last stripe is not complete - don't | |
3000 | * try to recover this sector. | |
3001 | */ | |
f90145f3 | 3002 | rcu_read_unlock(); |
fc448a18 N |
3003 | continue; |
3004 | } | |
f5b67ae8 N |
3005 | if (mreplace && test_bit(Faulty, &mreplace->flags)) |
3006 | mreplace = NULL; | |
24afd80d N |
3007 | /* Unless we are doing a full sync, or a replacement |
3008 | * we only need to recover the block if it is set in | |
3009 | * the bitmap | |
ab9d47e9 N |
3010 | */ |
3011 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
3012 | &sync_blocks, 1); | |
3013 | if (sync_blocks < max_sync) | |
3014 | max_sync = sync_blocks; | |
3015 | if (!must_sync && | |
f90145f3 | 3016 | mreplace == NULL && |
ab9d47e9 N |
3017 | !conf->fullsync) { |
3018 | /* yep, skip the sync_blocks here, but don't assume | |
3019 | * that there will never be anything to do here | |
3020 | */ | |
3021 | chunks_skipped = -1; | |
f90145f3 | 3022 | rcu_read_unlock(); |
ab9d47e9 N |
3023 | continue; |
3024 | } | |
f90145f3 N |
3025 | atomic_inc(&mrdev->nr_pending); |
3026 | if (mreplace) | |
3027 | atomic_inc(&mreplace->nr_pending); | |
3028 | rcu_read_unlock(); | |
6cce3b23 | 3029 | |
ab9d47e9 | 3030 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
cb8b12b5 | 3031 | r10_bio->state = 0; |
ab9d47e9 N |
3032 | raise_barrier(conf, rb2 != NULL); |
3033 | atomic_set(&r10_bio->remaining, 0); | |
18055569 | 3034 | |
ab9d47e9 N |
3035 | r10_bio->master_bio = (struct bio*)rb2; |
3036 | if (rb2) | |
3037 | atomic_inc(&rb2->remaining); | |
3038 | r10_bio->mddev = mddev; | |
3039 | set_bit(R10BIO_IsRecover, &r10_bio->state); | |
3040 | r10_bio->sector = sect; | |
1da177e4 | 3041 | |
ab9d47e9 N |
3042 | raid10_find_phys(conf, r10_bio); |
3043 | ||
3044 | /* Need to check if the array will still be | |
3045 | * degraded | |
3046 | */ | |
f90145f3 N |
3047 | rcu_read_lock(); |
3048 | for (j = 0; j < conf->geo.raid_disks; j++) { | |
3049 | struct md_rdev *rdev = rcu_dereference( | |
3050 | conf->mirrors[j].rdev); | |
3051 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { | |
ab9d47e9 | 3052 | still_degraded = 1; |
87fc767b | 3053 | break; |
1da177e4 | 3054 | } |
f90145f3 | 3055 | } |
ab9d47e9 N |
3056 | |
3057 | must_sync = bitmap_start_sync(mddev->bitmap, sect, | |
3058 | &sync_blocks, still_degraded); | |
3059 | ||
e875ecea | 3060 | any_working = 0; |
ab9d47e9 | 3061 | for (j=0; j<conf->copies;j++) { |
e875ecea | 3062 | int k; |
ab9d47e9 | 3063 | int d = r10_bio->devs[j].devnum; |
5e570289 | 3064 | sector_t from_addr, to_addr; |
f90145f3 N |
3065 | struct md_rdev *rdev = |
3066 | rcu_dereference(conf->mirrors[d].rdev); | |
40c356ce N |
3067 | sector_t sector, first_bad; |
3068 | int bad_sectors; | |
f90145f3 N |
3069 | if (!rdev || |
3070 | !test_bit(In_sync, &rdev->flags)) | |
ab9d47e9 N |
3071 | continue; |
3072 | /* This is where we read from */ | |
e875ecea | 3073 | any_working = 1; |
40c356ce N |
3074 | sector = r10_bio->devs[j].addr; |
3075 | ||
3076 | if (is_badblock(rdev, sector, max_sync, | |
3077 | &first_bad, &bad_sectors)) { | |
3078 | if (first_bad > sector) | |
3079 | max_sync = first_bad - sector; | |
3080 | else { | |
3081 | bad_sectors -= (sector | |
3082 | - first_bad); | |
3083 | if (max_sync > bad_sectors) | |
3084 | max_sync = bad_sectors; | |
3085 | continue; | |
3086 | } | |
3087 | } | |
ab9d47e9 N |
3088 | bio = r10_bio->devs[0].bio; |
3089 | bio->bi_next = biolist; | |
3090 | biolist = bio; | |
ab9d47e9 | 3091 | bio->bi_end_io = end_sync_read; |
796a5cf0 | 3092 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
8d3ca83d N |
3093 | if (test_bit(FailFast, &rdev->flags)) |
3094 | bio->bi_opf |= MD_FAILFAST; | |
5e570289 | 3095 | from_addr = r10_bio->devs[j].addr; |
4f024f37 KO |
3096 | bio->bi_iter.bi_sector = from_addr + |
3097 | rdev->data_offset; | |
24afd80d N |
3098 | bio->bi_bdev = rdev->bdev; |
3099 | atomic_inc(&rdev->nr_pending); | |
3100 | /* and we write to 'i' (if not in_sync) */ | |
ab9d47e9 N |
3101 | |
3102 | for (k=0; k<conf->copies; k++) | |
3103 | if (r10_bio->devs[k].devnum == i) | |
3104 | break; | |
3105 | BUG_ON(k == conf->copies); | |
5e570289 | 3106 | to_addr = r10_bio->devs[k].addr; |
ab9d47e9 | 3107 | r10_bio->devs[0].devnum = d; |
5e570289 | 3108 | r10_bio->devs[0].addr = from_addr; |
ab9d47e9 | 3109 | r10_bio->devs[1].devnum = i; |
5e570289 | 3110 | r10_bio->devs[1].addr = to_addr; |
ab9d47e9 | 3111 | |
f90145f3 | 3112 | if (!test_bit(In_sync, &mrdev->flags)) { |
24afd80d N |
3113 | bio = r10_bio->devs[1].bio; |
3114 | bio->bi_next = biolist; | |
3115 | biolist = bio; | |
24afd80d | 3116 | bio->bi_end_io = end_sync_write; |
796a5cf0 | 3117 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
4f024f37 | 3118 | bio->bi_iter.bi_sector = to_addr |
f90145f3 N |
3119 | + mrdev->data_offset; |
3120 | bio->bi_bdev = mrdev->bdev; | |
24afd80d N |
3121 | atomic_inc(&r10_bio->remaining); |
3122 | } else | |
3123 | r10_bio->devs[1].bio->bi_end_io = NULL; | |
3124 | ||
3125 | /* and maybe write to replacement */ | |
3126 | bio = r10_bio->devs[1].repl_bio; | |
3127 | if (bio) | |
3128 | bio->bi_end_io = NULL; | |
f90145f3 | 3129 | /* Note: if mreplace != NULL, then bio |
24afd80d N |
3130 | * cannot be NULL as r10buf_pool_alloc will |
3131 | * have allocated it. | |
3132 | * So the second test here is pointless. | |
3133 | * But it keeps semantic-checkers happy, and | |
3134 | * this comment keeps human reviewers | |
3135 | * happy. | |
3136 | */ | |
f90145f3 N |
3137 | if (mreplace == NULL || bio == NULL || |
3138 | test_bit(Faulty, &mreplace->flags)) | |
24afd80d N |
3139 | break; |
3140 | bio->bi_next = biolist; | |
3141 | biolist = bio; | |
24afd80d | 3142 | bio->bi_end_io = end_sync_write; |
796a5cf0 | 3143 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
4f024f37 | 3144 | bio->bi_iter.bi_sector = to_addr + |
f90145f3 N |
3145 | mreplace->data_offset; |
3146 | bio->bi_bdev = mreplace->bdev; | |
24afd80d | 3147 | atomic_inc(&r10_bio->remaining); |
ab9d47e9 N |
3148 | break; |
3149 | } | |
f90145f3 | 3150 | rcu_read_unlock(); |
ab9d47e9 | 3151 | if (j == conf->copies) { |
e875ecea N |
3152 | /* Cannot recover, so abort the recovery or |
3153 | * record a bad block */ | |
e875ecea N |
3154 | if (any_working) { |
3155 | /* problem is that there are bad blocks | |
3156 | * on other device(s) | |
3157 | */ | |
3158 | int k; | |
3159 | for (k = 0; k < conf->copies; k++) | |
3160 | if (r10_bio->devs[k].devnum == i) | |
3161 | break; | |
24afd80d | 3162 | if (!test_bit(In_sync, |
f90145f3 | 3163 | &mrdev->flags) |
24afd80d | 3164 | && !rdev_set_badblocks( |
f90145f3 | 3165 | mrdev, |
24afd80d N |
3166 | r10_bio->devs[k].addr, |
3167 | max_sync, 0)) | |
3168 | any_working = 0; | |
f90145f3 | 3169 | if (mreplace && |
24afd80d | 3170 | !rdev_set_badblocks( |
f90145f3 | 3171 | mreplace, |
e875ecea N |
3172 | r10_bio->devs[k].addr, |
3173 | max_sync, 0)) | |
3174 | any_working = 0; | |
3175 | } | |
3176 | if (!any_working) { | |
3177 | if (!test_and_set_bit(MD_RECOVERY_INTR, | |
3178 | &mddev->recovery)) | |
08464e09 | 3179 | pr_warn("md/raid10:%s: insufficient working devices for recovery.\n", |
e875ecea | 3180 | mdname(mddev)); |
24afd80d | 3181 | mirror->recovery_disabled |
e875ecea N |
3182 | = mddev->recovery_disabled; |
3183 | } | |
e8b84915 N |
3184 | put_buf(r10_bio); |
3185 | if (rb2) | |
3186 | atomic_dec(&rb2->remaining); | |
3187 | r10_bio = rb2; | |
f90145f3 N |
3188 | rdev_dec_pending(mrdev, mddev); |
3189 | if (mreplace) | |
3190 | rdev_dec_pending(mreplace, mddev); | |
ab9d47e9 | 3191 | break; |
1da177e4 | 3192 | } |
f90145f3 N |
3193 | rdev_dec_pending(mrdev, mddev); |
3194 | if (mreplace) | |
3195 | rdev_dec_pending(mreplace, mddev); | |
8d3ca83d N |
3196 | if (r10_bio->devs[0].bio->bi_opf & MD_FAILFAST) { |
3197 | /* Only want this if there is elsewhere to | |
3198 | * read from. 'j' is currently the first | |
3199 | * readable copy. | |
3200 | */ | |
3201 | int targets = 1; | |
3202 | for (; j < conf->copies; j++) { | |
3203 | int d = r10_bio->devs[j].devnum; | |
3204 | if (conf->mirrors[d].rdev && | |
3205 | test_bit(In_sync, | |
3206 | &conf->mirrors[d].rdev->flags)) | |
3207 | targets++; | |
3208 | } | |
3209 | if (targets == 1) | |
3210 | r10_bio->devs[0].bio->bi_opf | |
3211 | &= ~MD_FAILFAST; | |
3212 | } | |
ab9d47e9 | 3213 | } |
1da177e4 LT |
3214 | if (biolist == NULL) { |
3215 | while (r10_bio) { | |
9f2c9d12 N |
3216 | struct r10bio *rb2 = r10_bio; |
3217 | r10_bio = (struct r10bio*) rb2->master_bio; | |
1da177e4 LT |
3218 | rb2->master_bio = NULL; |
3219 | put_buf(rb2); | |
3220 | } | |
3221 | goto giveup; | |
3222 | } | |
3223 | } else { | |
3224 | /* resync. Schedule a read for every block at this virt offset */ | |
3225 | int count = 0; | |
6cce3b23 | 3226 | |
c40f341f | 3227 | bitmap_cond_end_sync(mddev->bitmap, sector_nr, 0); |
78200d45 | 3228 | |
6cce3b23 N |
3229 | if (!bitmap_start_sync(mddev->bitmap, sector_nr, |
3230 | &sync_blocks, mddev->degraded) && | |
ab9d47e9 N |
3231 | !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, |
3232 | &mddev->recovery)) { | |
6cce3b23 N |
3233 | /* We can skip this block */ |
3234 | *skipped = 1; | |
3235 | return sync_blocks + sectors_skipped; | |
3236 | } | |
3237 | if (sync_blocks < max_sync) | |
3238 | max_sync = sync_blocks; | |
1da177e4 | 3239 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); |
cb8b12b5 | 3240 | r10_bio->state = 0; |
1da177e4 | 3241 | |
1da177e4 LT |
3242 | r10_bio->mddev = mddev; |
3243 | atomic_set(&r10_bio->remaining, 0); | |
6cce3b23 N |
3244 | raise_barrier(conf, 0); |
3245 | conf->next_resync = sector_nr; | |
1da177e4 LT |
3246 | |
3247 | r10_bio->master_bio = NULL; | |
3248 | r10_bio->sector = sector_nr; | |
3249 | set_bit(R10BIO_IsSync, &r10_bio->state); | |
3250 | raid10_find_phys(conf, r10_bio); | |
5cf00fcd | 3251 | r10_bio->sectors = (sector_nr | chunk_mask) - sector_nr + 1; |
1da177e4 | 3252 | |
5cf00fcd | 3253 | for (i = 0; i < conf->copies; i++) { |
1da177e4 | 3254 | int d = r10_bio->devs[i].devnum; |
40c356ce N |
3255 | sector_t first_bad, sector; |
3256 | int bad_sectors; | |
f90145f3 | 3257 | struct md_rdev *rdev; |
40c356ce | 3258 | |
9ad1aefc N |
3259 | if (r10_bio->devs[i].repl_bio) |
3260 | r10_bio->devs[i].repl_bio->bi_end_io = NULL; | |
3261 | ||
1da177e4 | 3262 | bio = r10_bio->devs[i].bio; |
4e4cbee9 | 3263 | bio->bi_status = BLK_STS_IOERR; |
f90145f3 N |
3264 | rcu_read_lock(); |
3265 | rdev = rcu_dereference(conf->mirrors[d].rdev); | |
3266 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { | |
3267 | rcu_read_unlock(); | |
1da177e4 | 3268 | continue; |
f90145f3 | 3269 | } |
40c356ce | 3270 | sector = r10_bio->devs[i].addr; |
f90145f3 | 3271 | if (is_badblock(rdev, sector, max_sync, |
40c356ce N |
3272 | &first_bad, &bad_sectors)) { |
3273 | if (first_bad > sector) | |
3274 | max_sync = first_bad - sector; | |
3275 | else { | |
3276 | bad_sectors -= (sector - first_bad); | |
3277 | if (max_sync > bad_sectors) | |
91502f09 | 3278 | max_sync = bad_sectors; |
f90145f3 | 3279 | rcu_read_unlock(); |
40c356ce N |
3280 | continue; |
3281 | } | |
3282 | } | |
f90145f3 | 3283 | atomic_inc(&rdev->nr_pending); |
1da177e4 LT |
3284 | atomic_inc(&r10_bio->remaining); |
3285 | bio->bi_next = biolist; | |
3286 | biolist = bio; | |
1da177e4 | 3287 | bio->bi_end_io = end_sync_read; |
796a5cf0 | 3288 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
1cdd1257 | 3289 | if (test_bit(FailFast, &rdev->flags)) |
8d3ca83d | 3290 | bio->bi_opf |= MD_FAILFAST; |
f90145f3 N |
3291 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
3292 | bio->bi_bdev = rdev->bdev; | |
1da177e4 | 3293 | count++; |
9ad1aefc | 3294 | |
f90145f3 N |
3295 | rdev = rcu_dereference(conf->mirrors[d].replacement); |
3296 | if (rdev == NULL || test_bit(Faulty, &rdev->flags)) { | |
3297 | rcu_read_unlock(); | |
9ad1aefc | 3298 | continue; |
f90145f3 N |
3299 | } |
3300 | atomic_inc(&rdev->nr_pending); | |
9ad1aefc N |
3301 | |
3302 | /* Need to set up for writing to the replacement */ | |
3303 | bio = r10_bio->devs[i].repl_bio; | |
4e4cbee9 | 3304 | bio->bi_status = BLK_STS_IOERR; |
9ad1aefc N |
3305 | |
3306 | sector = r10_bio->devs[i].addr; | |
9ad1aefc N |
3307 | bio->bi_next = biolist; |
3308 | biolist = bio; | |
9ad1aefc | 3309 | bio->bi_end_io = end_sync_write; |
796a5cf0 | 3310 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); |
1cdd1257 | 3311 | if (test_bit(FailFast, &rdev->flags)) |
1919cbb2 | 3312 | bio->bi_opf |= MD_FAILFAST; |
f90145f3 N |
3313 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
3314 | bio->bi_bdev = rdev->bdev; | |
9ad1aefc | 3315 | count++; |
1cdd1257 | 3316 | rcu_read_unlock(); |
1da177e4 LT |
3317 | } |
3318 | ||
3319 | if (count < 2) { | |
3320 | for (i=0; i<conf->copies; i++) { | |
3321 | int d = r10_bio->devs[i].devnum; | |
3322 | if (r10_bio->devs[i].bio->bi_end_io) | |
ab9d47e9 N |
3323 | rdev_dec_pending(conf->mirrors[d].rdev, |
3324 | mddev); | |
9ad1aefc N |
3325 | if (r10_bio->devs[i].repl_bio && |
3326 | r10_bio->devs[i].repl_bio->bi_end_io) | |
3327 | rdev_dec_pending( | |
3328 | conf->mirrors[d].replacement, | |
3329 | mddev); | |
1da177e4 LT |
3330 | } |
3331 | put_buf(r10_bio); | |
3332 | biolist = NULL; | |
3333 | goto giveup; | |
3334 | } | |
3335 | } | |
3336 | ||
1da177e4 | 3337 | nr_sectors = 0; |
6cce3b23 N |
3338 | if (sector_nr + max_sync < max_sector) |
3339 | max_sector = sector_nr + max_sync; | |
1da177e4 LT |
3340 | do { |
3341 | struct page *page; | |
3342 | int len = PAGE_SIZE; | |
1da177e4 LT |
3343 | if (sector_nr + (len>>9) > max_sector) |
3344 | len = (max_sector - sector_nr) << 9; | |
3345 | if (len == 0) | |
3346 | break; | |
3347 | for (bio= biolist ; bio ; bio=bio->bi_next) { | |
f0250618 | 3348 | struct resync_pages *rp = get_resync_pages(bio); |
022e510f | 3349 | page = resync_fetch_page(rp, page_idx); |
c85ba149 ML |
3350 | /* |
3351 | * won't fail because the vec table is big enough | |
3352 | * to hold all these pages | |
3353 | */ | |
3354 | bio_add_page(bio, page, len, 0); | |
1da177e4 LT |
3355 | } |
3356 | nr_sectors += len>>9; | |
3357 | sector_nr += len>>9; | |
022e510f | 3358 | } while (++page_idx < RESYNC_PAGES); |
1da177e4 LT |
3359 | r10_bio->sectors = nr_sectors; |
3360 | ||
3361 | while (biolist) { | |
3362 | bio = biolist; | |
3363 | biolist = biolist->bi_next; | |
3364 | ||
3365 | bio->bi_next = NULL; | |
f0250618 | 3366 | r10_bio = get_resync_r10bio(bio); |
1da177e4 LT |
3367 | r10_bio->sectors = nr_sectors; |
3368 | ||
3369 | if (bio->bi_end_io == end_sync_read) { | |
3370 | md_sync_acct(bio->bi_bdev, nr_sectors); | |
4e4cbee9 | 3371 | bio->bi_status = 0; |
1da177e4 LT |
3372 | generic_make_request(bio); |
3373 | } | |
3374 | } | |
3375 | ||
57afd89f N |
3376 | if (sectors_skipped) |
3377 | /* pretend they weren't skipped, it makes | |
3378 | * no important difference in this case | |
3379 | */ | |
3380 | md_done_sync(mddev, sectors_skipped, 1); | |
3381 | ||
1da177e4 LT |
3382 | return sectors_skipped + nr_sectors; |
3383 | giveup: | |
3384 | /* There is nowhere to write, so all non-sync | |
e875ecea N |
3385 | * drives must be failed or in resync, all drives |
3386 | * have a bad block, so try the next chunk... | |
1da177e4 | 3387 | */ |
09b4068a N |
3388 | if (sector_nr + max_sync < max_sector) |
3389 | max_sector = sector_nr + max_sync; | |
3390 | ||
3391 | sectors_skipped += (max_sector - sector_nr); | |
1da177e4 LT |
3392 | chunks_skipped ++; |
3393 | sector_nr = max_sector; | |
1da177e4 | 3394 | goto skipped; |
1da177e4 LT |
3395 | } |
3396 | ||
80c3a6ce | 3397 | static sector_t |
fd01b88c | 3398 | raid10_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
3399 | { |
3400 | sector_t size; | |
e879a879 | 3401 | struct r10conf *conf = mddev->private; |
80c3a6ce DW |
3402 | |
3403 | if (!raid_disks) | |
3ea7daa5 N |
3404 | raid_disks = min(conf->geo.raid_disks, |
3405 | conf->prev.raid_disks); | |
80c3a6ce | 3406 | if (!sectors) |
dab8b292 | 3407 | sectors = conf->dev_sectors; |
80c3a6ce | 3408 | |
5cf00fcd N |
3409 | size = sectors >> conf->geo.chunk_shift; |
3410 | sector_div(size, conf->geo.far_copies); | |
80c3a6ce | 3411 | size = size * raid_disks; |
5cf00fcd | 3412 | sector_div(size, conf->geo.near_copies); |
80c3a6ce | 3413 | |
5cf00fcd | 3414 | return size << conf->geo.chunk_shift; |
80c3a6ce DW |
3415 | } |
3416 | ||
6508fdbf N |
3417 | static void calc_sectors(struct r10conf *conf, sector_t size) |
3418 | { | |
3419 | /* Calculate the number of sectors-per-device that will | |
3420 | * actually be used, and set conf->dev_sectors and | |
3421 | * conf->stride | |
3422 | */ | |
3423 | ||
5cf00fcd N |
3424 | size = size >> conf->geo.chunk_shift; |
3425 | sector_div(size, conf->geo.far_copies); | |
3426 | size = size * conf->geo.raid_disks; | |
3427 | sector_div(size, conf->geo.near_copies); | |
6508fdbf N |
3428 | /* 'size' is now the number of chunks in the array */ |
3429 | /* calculate "used chunks per device" */ | |
3430 | size = size * conf->copies; | |
3431 | ||
3432 | /* We need to round up when dividing by raid_disks to | |
3433 | * get the stride size. | |
3434 | */ | |
5cf00fcd | 3435 | size = DIV_ROUND_UP_SECTOR_T(size, conf->geo.raid_disks); |
6508fdbf | 3436 | |
5cf00fcd | 3437 | conf->dev_sectors = size << conf->geo.chunk_shift; |
6508fdbf | 3438 | |
5cf00fcd N |
3439 | if (conf->geo.far_offset) |
3440 | conf->geo.stride = 1 << conf->geo.chunk_shift; | |
6508fdbf | 3441 | else { |
5cf00fcd N |
3442 | sector_div(size, conf->geo.far_copies); |
3443 | conf->geo.stride = size << conf->geo.chunk_shift; | |
6508fdbf N |
3444 | } |
3445 | } | |
dab8b292 | 3446 | |
deb200d0 N |
3447 | enum geo_type {geo_new, geo_old, geo_start}; |
3448 | static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new) | |
3449 | { | |
3450 | int nc, fc, fo; | |
3451 | int layout, chunk, disks; | |
3452 | switch (new) { | |
3453 | case geo_old: | |
3454 | layout = mddev->layout; | |
3455 | chunk = mddev->chunk_sectors; | |
3456 | disks = mddev->raid_disks - mddev->delta_disks; | |
3457 | break; | |
3458 | case geo_new: | |
3459 | layout = mddev->new_layout; | |
3460 | chunk = mddev->new_chunk_sectors; | |
3461 | disks = mddev->raid_disks; | |
3462 | break; | |
3463 | default: /* avoid 'may be unused' warnings */ | |
3464 | case geo_start: /* new when starting reshape - raid_disks not | |
3465 | * updated yet. */ | |
3466 | layout = mddev->new_layout; | |
3467 | chunk = mddev->new_chunk_sectors; | |
3468 | disks = mddev->raid_disks + mddev->delta_disks; | |
3469 | break; | |
3470 | } | |
8bce6d35 | 3471 | if (layout >> 19) |
deb200d0 N |
3472 | return -1; |
3473 | if (chunk < (PAGE_SIZE >> 9) || | |
3474 | !is_power_of_2(chunk)) | |
3475 | return -2; | |
3476 | nc = layout & 255; | |
3477 | fc = (layout >> 8) & 255; | |
3478 | fo = layout & (1<<16); | |
3479 | geo->raid_disks = disks; | |
3480 | geo->near_copies = nc; | |
3481 | geo->far_copies = fc; | |
3482 | geo->far_offset = fo; | |
8bce6d35 N |
3483 | switch (layout >> 17) { |
3484 | case 0: /* original layout. simple but not always optimal */ | |
3485 | geo->far_set_size = disks; | |
3486 | break; | |
3487 | case 1: /* "improved" layout which was buggy. Hopefully no-one is | |
3488 | * actually using this, but leave code here just in case.*/ | |
3489 | geo->far_set_size = disks/fc; | |
3490 | WARN(geo->far_set_size < fc, | |
3491 | "This RAID10 layout does not provide data safety - please backup and create new array\n"); | |
3492 | break; | |
3493 | case 2: /* "improved" layout fixed to match documentation */ | |
3494 | geo->far_set_size = fc * nc; | |
3495 | break; | |
3496 | default: /* Not a valid layout */ | |
3497 | return -1; | |
3498 | } | |
deb200d0 N |
3499 | geo->chunk_mask = chunk - 1; |
3500 | geo->chunk_shift = ffz(~chunk); | |
3501 | return nc*fc; | |
3502 | } | |
3503 | ||
e879a879 | 3504 | static struct r10conf *setup_conf(struct mddev *mddev) |
1da177e4 | 3505 | { |
e879a879 | 3506 | struct r10conf *conf = NULL; |
dab8b292 | 3507 | int err = -EINVAL; |
deb200d0 N |
3508 | struct geom geo; |
3509 | int copies; | |
3510 | ||
3511 | copies = setup_geo(&geo, mddev, geo_new); | |
1da177e4 | 3512 | |
deb200d0 | 3513 | if (copies == -2) { |
08464e09 N |
3514 | pr_warn("md/raid10:%s: chunk size must be at least PAGE_SIZE(%ld) and be a power of 2.\n", |
3515 | mdname(mddev), PAGE_SIZE); | |
dab8b292 | 3516 | goto out; |
1da177e4 | 3517 | } |
2604b703 | 3518 | |
deb200d0 | 3519 | if (copies < 2 || copies > mddev->raid_disks) { |
08464e09 N |
3520 | pr_warn("md/raid10:%s: unsupported raid10 layout: 0x%8x\n", |
3521 | mdname(mddev), mddev->new_layout); | |
1da177e4 LT |
3522 | goto out; |
3523 | } | |
dab8b292 TM |
3524 | |
3525 | err = -ENOMEM; | |
e879a879 | 3526 | conf = kzalloc(sizeof(struct r10conf), GFP_KERNEL); |
dab8b292 | 3527 | if (!conf) |
1da177e4 | 3528 | goto out; |
dab8b292 | 3529 | |
3ea7daa5 | 3530 | /* FIXME calc properly */ |
dc280d98 | 3531 | conf->mirrors = kzalloc(sizeof(struct raid10_info)*(mddev->raid_disks + |
78eaa0d4 | 3532 | max(0,-mddev->delta_disks)), |
dab8b292 TM |
3533 | GFP_KERNEL); |
3534 | if (!conf->mirrors) | |
3535 | goto out; | |
4443ae10 N |
3536 | |
3537 | conf->tmppage = alloc_page(GFP_KERNEL); | |
3538 | if (!conf->tmppage) | |
dab8b292 TM |
3539 | goto out; |
3540 | ||
deb200d0 N |
3541 | conf->geo = geo; |
3542 | conf->copies = copies; | |
dab8b292 TM |
3543 | conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc, |
3544 | r10bio_pool_free, conf); | |
3545 | if (!conf->r10bio_pool) | |
3546 | goto out; | |
3547 | ||
011067b0 | 3548 | conf->bio_split = bioset_create(BIO_POOL_SIZE, 0, 0); |
fc9977dd N |
3549 | if (!conf->bio_split) |
3550 | goto out; | |
3551 | ||
6508fdbf | 3552 | calc_sectors(conf, mddev->dev_sectors); |
3ea7daa5 N |
3553 | if (mddev->reshape_position == MaxSector) { |
3554 | conf->prev = conf->geo; | |
3555 | conf->reshape_progress = MaxSector; | |
3556 | } else { | |
3557 | if (setup_geo(&conf->prev, mddev, geo_old) != conf->copies) { | |
3558 | err = -EINVAL; | |
3559 | goto out; | |
3560 | } | |
3561 | conf->reshape_progress = mddev->reshape_position; | |
3562 | if (conf->prev.far_offset) | |
3563 | conf->prev.stride = 1 << conf->prev.chunk_shift; | |
3564 | else | |
3565 | /* far_copies must be 1 */ | |
3566 | conf->prev.stride = conf->dev_sectors; | |
3567 | } | |
299b0685 | 3568 | conf->reshape_safe = conf->reshape_progress; |
e7e72bf6 | 3569 | spin_lock_init(&conf->device_lock); |
dab8b292 | 3570 | INIT_LIST_HEAD(&conf->retry_list); |
95af587e | 3571 | INIT_LIST_HEAD(&conf->bio_end_io_list); |
dab8b292 TM |
3572 | |
3573 | spin_lock_init(&conf->resync_lock); | |
3574 | init_waitqueue_head(&conf->wait_barrier); | |
0e5313e2 | 3575 | atomic_set(&conf->nr_pending, 0); |
dab8b292 | 3576 | |
0232605d | 3577 | conf->thread = md_register_thread(raid10d, mddev, "raid10"); |
dab8b292 TM |
3578 | if (!conf->thread) |
3579 | goto out; | |
3580 | ||
dab8b292 TM |
3581 | conf->mddev = mddev; |
3582 | return conf; | |
3583 | ||
3584 | out: | |
dab8b292 | 3585 | if (conf) { |
644df1a8 | 3586 | mempool_destroy(conf->r10bio_pool); |
dab8b292 TM |
3587 | kfree(conf->mirrors); |
3588 | safe_put_page(conf->tmppage); | |
fc9977dd N |
3589 | if (conf->bio_split) |
3590 | bioset_free(conf->bio_split); | |
dab8b292 TM |
3591 | kfree(conf); |
3592 | } | |
3593 | return ERR_PTR(err); | |
3594 | } | |
3595 | ||
849674e4 | 3596 | static int raid10_run(struct mddev *mddev) |
dab8b292 | 3597 | { |
e879a879 | 3598 | struct r10conf *conf; |
dab8b292 | 3599 | int i, disk_idx, chunk_size; |
dc280d98 | 3600 | struct raid10_info *disk; |
3cb03002 | 3601 | struct md_rdev *rdev; |
dab8b292 | 3602 | sector_t size; |
3ea7daa5 N |
3603 | sector_t min_offset_diff = 0; |
3604 | int first = 1; | |
532a2a3f | 3605 | bool discard_supported = false; |
dab8b292 | 3606 | |
a415c0f1 N |
3607 | if (mddev_init_writes_pending(mddev) < 0) |
3608 | return -ENOMEM; | |
3609 | ||
dab8b292 TM |
3610 | if (mddev->private == NULL) { |
3611 | conf = setup_conf(mddev); | |
3612 | if (IS_ERR(conf)) | |
3613 | return PTR_ERR(conf); | |
3614 | mddev->private = conf; | |
3615 | } | |
3616 | conf = mddev->private; | |
3617 | if (!conf) | |
3618 | goto out; | |
3619 | ||
dab8b292 TM |
3620 | mddev->thread = conf->thread; |
3621 | conf->thread = NULL; | |
3622 | ||
8f6c2e4b | 3623 | chunk_size = mddev->chunk_sectors << 9; |
cc4d1efd | 3624 | if (mddev->queue) { |
532a2a3f SL |
3625 | blk_queue_max_discard_sectors(mddev->queue, |
3626 | mddev->chunk_sectors); | |
5026d7a9 | 3627 | blk_queue_max_write_same_sectors(mddev->queue, 0); |
3deff1a7 | 3628 | blk_queue_max_write_zeroes_sectors(mddev->queue, 0); |
cc4d1efd JB |
3629 | blk_queue_io_min(mddev->queue, chunk_size); |
3630 | if (conf->geo.raid_disks % conf->geo.near_copies) | |
3631 | blk_queue_io_opt(mddev->queue, chunk_size * conf->geo.raid_disks); | |
3632 | else | |
3633 | blk_queue_io_opt(mddev->queue, chunk_size * | |
3634 | (conf->geo.raid_disks / conf->geo.near_copies)); | |
3635 | } | |
8f6c2e4b | 3636 | |
dafb20fa | 3637 | rdev_for_each(rdev, mddev) { |
3ea7daa5 | 3638 | long long diff; |
34b343cf | 3639 | |
1da177e4 | 3640 | disk_idx = rdev->raid_disk; |
f8c9e74f N |
3641 | if (disk_idx < 0) |
3642 | continue; | |
3643 | if (disk_idx >= conf->geo.raid_disks && | |
3644 | disk_idx >= conf->prev.raid_disks) | |
1da177e4 LT |
3645 | continue; |
3646 | disk = conf->mirrors + disk_idx; | |
3647 | ||
56a2559b N |
3648 | if (test_bit(Replacement, &rdev->flags)) { |
3649 | if (disk->replacement) | |
3650 | goto out_free_conf; | |
3651 | disk->replacement = rdev; | |
3652 | } else { | |
3653 | if (disk->rdev) | |
3654 | goto out_free_conf; | |
3655 | disk->rdev = rdev; | |
3656 | } | |
3ea7daa5 N |
3657 | diff = (rdev->new_data_offset - rdev->data_offset); |
3658 | if (!mddev->reshape_backwards) | |
3659 | diff = -diff; | |
3660 | if (diff < 0) | |
3661 | diff = 0; | |
3662 | if (first || diff < min_offset_diff) | |
3663 | min_offset_diff = diff; | |
56a2559b | 3664 | |
cc4d1efd JB |
3665 | if (mddev->gendisk) |
3666 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
3667 | rdev->data_offset << 9); | |
1da177e4 LT |
3668 | |
3669 | disk->head_position = 0; | |
532a2a3f SL |
3670 | |
3671 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
3672 | discard_supported = true; | |
6f287ca6 | 3673 | first = 0; |
1da177e4 | 3674 | } |
3ea7daa5 | 3675 | |
ed30be07 JB |
3676 | if (mddev->queue) { |
3677 | if (discard_supported) | |
3678 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, | |
3679 | mddev->queue); | |
3680 | else | |
3681 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, | |
3682 | mddev->queue); | |
3683 | } | |
6d508242 | 3684 | /* need to check that every block has at least one working mirror */ |
700c7213 | 3685 | if (!enough(conf, -1)) { |
08464e09 | 3686 | pr_err("md/raid10:%s: not enough operational mirrors.\n", |
6d508242 | 3687 | mdname(mddev)); |
1da177e4 LT |
3688 | goto out_free_conf; |
3689 | } | |
3690 | ||
3ea7daa5 N |
3691 | if (conf->reshape_progress != MaxSector) { |
3692 | /* must ensure that shape change is supported */ | |
3693 | if (conf->geo.far_copies != 1 && | |
3694 | conf->geo.far_offset == 0) | |
3695 | goto out_free_conf; | |
3696 | if (conf->prev.far_copies != 1 && | |
78eaa0d4 | 3697 | conf->prev.far_offset == 0) |
3ea7daa5 N |
3698 | goto out_free_conf; |
3699 | } | |
3700 | ||
1da177e4 | 3701 | mddev->degraded = 0; |
f8c9e74f N |
3702 | for (i = 0; |
3703 | i < conf->geo.raid_disks | |
3704 | || i < conf->prev.raid_disks; | |
3705 | i++) { | |
1da177e4 LT |
3706 | |
3707 | disk = conf->mirrors + i; | |
3708 | ||
56a2559b N |
3709 | if (!disk->rdev && disk->replacement) { |
3710 | /* The replacement is all we have - use it */ | |
3711 | disk->rdev = disk->replacement; | |
3712 | disk->replacement = NULL; | |
3713 | clear_bit(Replacement, &disk->rdev->flags); | |
3714 | } | |
3715 | ||
5fd6c1dc | 3716 | if (!disk->rdev || |
2e333e89 | 3717 | !test_bit(In_sync, &disk->rdev->flags)) { |
1da177e4 LT |
3718 | disk->head_position = 0; |
3719 | mddev->degraded++; | |
0b59bb64 N |
3720 | if (disk->rdev && |
3721 | disk->rdev->saved_raid_disk < 0) | |
8c2e870a | 3722 | conf->fullsync = 1; |
1da177e4 | 3723 | } |
d890fa2b | 3724 | disk->recovery_disabled = mddev->recovery_disabled - 1; |
1da177e4 LT |
3725 | } |
3726 | ||
8c6ac868 | 3727 | if (mddev->recovery_cp != MaxSector) |
08464e09 N |
3728 | pr_notice("md/raid10:%s: not clean -- starting background reconstruction\n", |
3729 | mdname(mddev)); | |
3730 | pr_info("md/raid10:%s: active with %d out of %d devices\n", | |
5cf00fcd N |
3731 | mdname(mddev), conf->geo.raid_disks - mddev->degraded, |
3732 | conf->geo.raid_disks); | |
1da177e4 LT |
3733 | /* |
3734 | * Ok, everything is just fine now | |
3735 | */ | |
dab8b292 TM |
3736 | mddev->dev_sectors = conf->dev_sectors; |
3737 | size = raid10_size(mddev, 0, 0); | |
3738 | md_set_array_sectors(mddev, size); | |
3739 | mddev->resync_max_sectors = size; | |
46533ff7 | 3740 | set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); |
1da177e4 | 3741 | |
cc4d1efd | 3742 | if (mddev->queue) { |
5cf00fcd | 3743 | int stripe = conf->geo.raid_disks * |
9d8f0363 | 3744 | ((mddev->chunk_sectors << 9) / PAGE_SIZE); |
cc4d1efd JB |
3745 | |
3746 | /* Calculate max read-ahead size. | |
3747 | * We need to readahead at least twice a whole stripe.... | |
3748 | * maybe... | |
3749 | */ | |
5cf00fcd | 3750 | stripe /= conf->geo.near_copies; |
dc3b17cc JK |
3751 | if (mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
3752 | mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
1da177e4 LT |
3753 | } |
3754 | ||
a91a2785 MP |
3755 | if (md_integrity_register(mddev)) |
3756 | goto out_free_conf; | |
3757 | ||
3ea7daa5 N |
3758 | if (conf->reshape_progress != MaxSector) { |
3759 | unsigned long before_length, after_length; | |
3760 | ||
3761 | before_length = ((1 << conf->prev.chunk_shift) * | |
3762 | conf->prev.far_copies); | |
3763 | after_length = ((1 << conf->geo.chunk_shift) * | |
3764 | conf->geo.far_copies); | |
3765 | ||
3766 | if (max(before_length, after_length) > min_offset_diff) { | |
3767 | /* This cannot work */ | |
08464e09 | 3768 | pr_warn("md/raid10: offset difference not enough to continue reshape\n"); |
3ea7daa5 N |
3769 | goto out_free_conf; |
3770 | } | |
3771 | conf->offset_diff = min_offset_diff; | |
3772 | ||
3ea7daa5 N |
3773 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
3774 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
3775 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
3776 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
3777 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
3778 | "reshape"); | |
3779 | } | |
3780 | ||
1da177e4 LT |
3781 | return 0; |
3782 | ||
3783 | out_free_conf: | |
01f96c0a | 3784 | md_unregister_thread(&mddev->thread); |
644df1a8 | 3785 | mempool_destroy(conf->r10bio_pool); |
1345b1d8 | 3786 | safe_put_page(conf->tmppage); |
990a8baf | 3787 | kfree(conf->mirrors); |
1da177e4 LT |
3788 | kfree(conf); |
3789 | mddev->private = NULL; | |
3790 | out: | |
3791 | return -EIO; | |
3792 | } | |
3793 | ||
afa0f557 | 3794 | static void raid10_free(struct mddev *mddev, void *priv) |
1da177e4 | 3795 | { |
afa0f557 | 3796 | struct r10conf *conf = priv; |
1da177e4 | 3797 | |
644df1a8 | 3798 | mempool_destroy(conf->r10bio_pool); |
0fea7ed8 | 3799 | safe_put_page(conf->tmppage); |
990a8baf | 3800 | kfree(conf->mirrors); |
c4796e21 N |
3801 | kfree(conf->mirrors_old); |
3802 | kfree(conf->mirrors_new); | |
fc9977dd N |
3803 | if (conf->bio_split) |
3804 | bioset_free(conf->bio_split); | |
1da177e4 | 3805 | kfree(conf); |
1da177e4 LT |
3806 | } |
3807 | ||
fd01b88c | 3808 | static void raid10_quiesce(struct mddev *mddev, int state) |
6cce3b23 | 3809 | { |
e879a879 | 3810 | struct r10conf *conf = mddev->private; |
6cce3b23 N |
3811 | |
3812 | switch(state) { | |
3813 | case 1: | |
3814 | raise_barrier(conf, 0); | |
3815 | break; | |
3816 | case 0: | |
3817 | lower_barrier(conf); | |
3818 | break; | |
3819 | } | |
6cce3b23 | 3820 | } |
1da177e4 | 3821 | |
006a09a0 N |
3822 | static int raid10_resize(struct mddev *mddev, sector_t sectors) |
3823 | { | |
3824 | /* Resize of 'far' arrays is not supported. | |
3825 | * For 'near' and 'offset' arrays we can set the | |
3826 | * number of sectors used to be an appropriate multiple | |
3827 | * of the chunk size. | |
3828 | * For 'offset', this is far_copies*chunksize. | |
3829 | * For 'near' the multiplier is the LCM of | |
3830 | * near_copies and raid_disks. | |
3831 | * So if far_copies > 1 && !far_offset, fail. | |
3832 | * Else find LCM(raid_disks, near_copy)*far_copies and | |
3833 | * multiply by chunk_size. Then round to this number. | |
3834 | * This is mostly done by raid10_size() | |
3835 | */ | |
3836 | struct r10conf *conf = mddev->private; | |
3837 | sector_t oldsize, size; | |
3838 | ||
f8c9e74f N |
3839 | if (mddev->reshape_position != MaxSector) |
3840 | return -EBUSY; | |
3841 | ||
5cf00fcd | 3842 | if (conf->geo.far_copies > 1 && !conf->geo.far_offset) |
006a09a0 N |
3843 | return -EINVAL; |
3844 | ||
3845 | oldsize = raid10_size(mddev, 0, 0); | |
3846 | size = raid10_size(mddev, sectors, 0); | |
a4a6125a N |
3847 | if (mddev->external_size && |
3848 | mddev->array_sectors > size) | |
006a09a0 | 3849 | return -EINVAL; |
a4a6125a N |
3850 | if (mddev->bitmap) { |
3851 | int ret = bitmap_resize(mddev->bitmap, size, 0, 0); | |
3852 | if (ret) | |
3853 | return ret; | |
3854 | } | |
3855 | md_set_array_sectors(mddev, size); | |
006a09a0 N |
3856 | if (sectors > mddev->dev_sectors && |
3857 | mddev->recovery_cp > oldsize) { | |
3858 | mddev->recovery_cp = oldsize; | |
3859 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3860 | } | |
6508fdbf N |
3861 | calc_sectors(conf, sectors); |
3862 | mddev->dev_sectors = conf->dev_sectors; | |
006a09a0 N |
3863 | mddev->resync_max_sectors = size; |
3864 | return 0; | |
3865 | } | |
3866 | ||
53a6ab4d | 3867 | static void *raid10_takeover_raid0(struct mddev *mddev, sector_t size, int devs) |
dab8b292 | 3868 | { |
3cb03002 | 3869 | struct md_rdev *rdev; |
e879a879 | 3870 | struct r10conf *conf; |
dab8b292 TM |
3871 | |
3872 | if (mddev->degraded > 0) { | |
08464e09 N |
3873 | pr_warn("md/raid10:%s: Error: degraded raid0!\n", |
3874 | mdname(mddev)); | |
dab8b292 TM |
3875 | return ERR_PTR(-EINVAL); |
3876 | } | |
53a6ab4d | 3877 | sector_div(size, devs); |
dab8b292 | 3878 | |
dab8b292 TM |
3879 | /* Set new parameters */ |
3880 | mddev->new_level = 10; | |
3881 | /* new layout: far_copies = 1, near_copies = 2 */ | |
3882 | mddev->new_layout = (1<<8) + 2; | |
3883 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
3884 | mddev->delta_disks = mddev->raid_disks; | |
dab8b292 TM |
3885 | mddev->raid_disks *= 2; |
3886 | /* make sure it will be not marked as dirty */ | |
3887 | mddev->recovery_cp = MaxSector; | |
53a6ab4d | 3888 | mddev->dev_sectors = size; |
dab8b292 TM |
3889 | |
3890 | conf = setup_conf(mddev); | |
02214dc5 | 3891 | if (!IS_ERR(conf)) { |
dafb20fa | 3892 | rdev_for_each(rdev, mddev) |
53a6ab4d | 3893 | if (rdev->raid_disk >= 0) { |
e93f68a1 | 3894 | rdev->new_raid_disk = rdev->raid_disk * 2; |
53a6ab4d N |
3895 | rdev->sectors = size; |
3896 | } | |
02214dc5 KW |
3897 | conf->barrier = 1; |
3898 | } | |
3899 | ||
dab8b292 TM |
3900 | return conf; |
3901 | } | |
3902 | ||
fd01b88c | 3903 | static void *raid10_takeover(struct mddev *mddev) |
dab8b292 | 3904 | { |
e373ab10 | 3905 | struct r0conf *raid0_conf; |
dab8b292 TM |
3906 | |
3907 | /* raid10 can take over: | |
3908 | * raid0 - providing it has only two drives | |
3909 | */ | |
3910 | if (mddev->level == 0) { | |
3911 | /* for raid0 takeover only one zone is supported */ | |
e373ab10 N |
3912 | raid0_conf = mddev->private; |
3913 | if (raid0_conf->nr_strip_zones > 1) { | |
08464e09 N |
3914 | pr_warn("md/raid10:%s: cannot takeover raid 0 with more than one zone.\n", |
3915 | mdname(mddev)); | |
dab8b292 TM |
3916 | return ERR_PTR(-EINVAL); |
3917 | } | |
53a6ab4d N |
3918 | return raid10_takeover_raid0(mddev, |
3919 | raid0_conf->strip_zone->zone_end, | |
3920 | raid0_conf->strip_zone->nb_dev); | |
dab8b292 TM |
3921 | } |
3922 | return ERR_PTR(-EINVAL); | |
3923 | } | |
3924 | ||
3ea7daa5 N |
3925 | static int raid10_check_reshape(struct mddev *mddev) |
3926 | { | |
3927 | /* Called when there is a request to change | |
3928 | * - layout (to ->new_layout) | |
3929 | * - chunk size (to ->new_chunk_sectors) | |
3930 | * - raid_disks (by delta_disks) | |
3931 | * or when trying to restart a reshape that was ongoing. | |
3932 | * | |
3933 | * We need to validate the request and possibly allocate | |
3934 | * space if that might be an issue later. | |
3935 | * | |
3936 | * Currently we reject any reshape of a 'far' mode array, | |
3937 | * allow chunk size to change if new is generally acceptable, | |
3938 | * allow raid_disks to increase, and allow | |
3939 | * a switch between 'near' mode and 'offset' mode. | |
3940 | */ | |
3941 | struct r10conf *conf = mddev->private; | |
3942 | struct geom geo; | |
3943 | ||
3944 | if (conf->geo.far_copies != 1 && !conf->geo.far_offset) | |
3945 | return -EINVAL; | |
3946 | ||
3947 | if (setup_geo(&geo, mddev, geo_start) != conf->copies) | |
3948 | /* mustn't change number of copies */ | |
3949 | return -EINVAL; | |
3950 | if (geo.far_copies > 1 && !geo.far_offset) | |
3951 | /* Cannot switch to 'far' mode */ | |
3952 | return -EINVAL; | |
3953 | ||
3954 | if (mddev->array_sectors & geo.chunk_mask) | |
3955 | /* not factor of array size */ | |
3956 | return -EINVAL; | |
3957 | ||
3ea7daa5 N |
3958 | if (!enough(conf, -1)) |
3959 | return -EINVAL; | |
3960 | ||
3961 | kfree(conf->mirrors_new); | |
3962 | conf->mirrors_new = NULL; | |
3963 | if (mddev->delta_disks > 0) { | |
3964 | /* allocate new 'mirrors' list */ | |
3965 | conf->mirrors_new = kzalloc( | |
dc280d98 | 3966 | sizeof(struct raid10_info) |
3ea7daa5 N |
3967 | *(mddev->raid_disks + |
3968 | mddev->delta_disks), | |
3969 | GFP_KERNEL); | |
3970 | if (!conf->mirrors_new) | |
3971 | return -ENOMEM; | |
3972 | } | |
3973 | return 0; | |
3974 | } | |
3975 | ||
3976 | /* | |
3977 | * Need to check if array has failed when deciding whether to: | |
3978 | * - start an array | |
3979 | * - remove non-faulty devices | |
3980 | * - add a spare | |
3981 | * - allow a reshape | |
3982 | * This determination is simple when no reshape is happening. | |
3983 | * However if there is a reshape, we need to carefully check | |
3984 | * both the before and after sections. | |
3985 | * This is because some failed devices may only affect one | |
3986 | * of the two sections, and some non-in_sync devices may | |
3987 | * be insync in the section most affected by failed devices. | |
3988 | */ | |
3989 | static int calc_degraded(struct r10conf *conf) | |
3990 | { | |
3991 | int degraded, degraded2; | |
3992 | int i; | |
3993 | ||
3994 | rcu_read_lock(); | |
3995 | degraded = 0; | |
3996 | /* 'prev' section first */ | |
3997 | for (i = 0; i < conf->prev.raid_disks; i++) { | |
3998 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
3999 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
4000 | degraded++; | |
4001 | else if (!test_bit(In_sync, &rdev->flags)) | |
4002 | /* When we can reduce the number of devices in | |
4003 | * an array, this might not contribute to | |
4004 | * 'degraded'. It does now. | |
4005 | */ | |
4006 | degraded++; | |
4007 | } | |
4008 | rcu_read_unlock(); | |
4009 | if (conf->geo.raid_disks == conf->prev.raid_disks) | |
4010 | return degraded; | |
4011 | rcu_read_lock(); | |
4012 | degraded2 = 0; | |
4013 | for (i = 0; i < conf->geo.raid_disks; i++) { | |
4014 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); | |
4015 | if (!rdev || test_bit(Faulty, &rdev->flags)) | |
4016 | degraded2++; | |
4017 | else if (!test_bit(In_sync, &rdev->flags)) { | |
4018 | /* If reshape is increasing the number of devices, | |
4019 | * this section has already been recovered, so | |
4020 | * it doesn't contribute to degraded. | |
4021 | * else it does. | |
4022 | */ | |
4023 | if (conf->geo.raid_disks <= conf->prev.raid_disks) | |
4024 | degraded2++; | |
4025 | } | |
4026 | } | |
4027 | rcu_read_unlock(); | |
4028 | if (degraded2 > degraded) | |
4029 | return degraded2; | |
4030 | return degraded; | |
4031 | } | |
4032 | ||
4033 | static int raid10_start_reshape(struct mddev *mddev) | |
4034 | { | |
4035 | /* A 'reshape' has been requested. This commits | |
4036 | * the various 'new' fields and sets MD_RECOVER_RESHAPE | |
4037 | * This also checks if there are enough spares and adds them | |
4038 | * to the array. | |
4039 | * We currently require enough spares to make the final | |
4040 | * array non-degraded. We also require that the difference | |
4041 | * between old and new data_offset - on each device - is | |
4042 | * enough that we never risk over-writing. | |
4043 | */ | |
4044 | ||
4045 | unsigned long before_length, after_length; | |
4046 | sector_t min_offset_diff = 0; | |
4047 | int first = 1; | |
4048 | struct geom new; | |
4049 | struct r10conf *conf = mddev->private; | |
4050 | struct md_rdev *rdev; | |
4051 | int spares = 0; | |
bb63a701 | 4052 | int ret; |
3ea7daa5 N |
4053 | |
4054 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4055 | return -EBUSY; | |
4056 | ||
4057 | if (setup_geo(&new, mddev, geo_start) != conf->copies) | |
4058 | return -EINVAL; | |
4059 | ||
4060 | before_length = ((1 << conf->prev.chunk_shift) * | |
4061 | conf->prev.far_copies); | |
4062 | after_length = ((1 << conf->geo.chunk_shift) * | |
4063 | conf->geo.far_copies); | |
4064 | ||
4065 | rdev_for_each(rdev, mddev) { | |
4066 | if (!test_bit(In_sync, &rdev->flags) | |
4067 | && !test_bit(Faulty, &rdev->flags)) | |
4068 | spares++; | |
4069 | if (rdev->raid_disk >= 0) { | |
4070 | long long diff = (rdev->new_data_offset | |
4071 | - rdev->data_offset); | |
4072 | if (!mddev->reshape_backwards) | |
4073 | diff = -diff; | |
4074 | if (diff < 0) | |
4075 | diff = 0; | |
4076 | if (first || diff < min_offset_diff) | |
4077 | min_offset_diff = diff; | |
b506335e | 4078 | first = 0; |
3ea7daa5 N |
4079 | } |
4080 | } | |
4081 | ||
4082 | if (max(before_length, after_length) > min_offset_diff) | |
4083 | return -EINVAL; | |
4084 | ||
4085 | if (spares < mddev->delta_disks) | |
4086 | return -EINVAL; | |
4087 | ||
4088 | conf->offset_diff = min_offset_diff; | |
4089 | spin_lock_irq(&conf->device_lock); | |
4090 | if (conf->mirrors_new) { | |
4091 | memcpy(conf->mirrors_new, conf->mirrors, | |
dc280d98 | 4092 | sizeof(struct raid10_info)*conf->prev.raid_disks); |
3ea7daa5 | 4093 | smp_mb(); |
c4796e21 | 4094 | kfree(conf->mirrors_old); |
3ea7daa5 N |
4095 | conf->mirrors_old = conf->mirrors; |
4096 | conf->mirrors = conf->mirrors_new; | |
4097 | conf->mirrors_new = NULL; | |
4098 | } | |
4099 | setup_geo(&conf->geo, mddev, geo_start); | |
4100 | smp_mb(); | |
4101 | if (mddev->reshape_backwards) { | |
4102 | sector_t size = raid10_size(mddev, 0, 0); | |
4103 | if (size < mddev->array_sectors) { | |
4104 | spin_unlock_irq(&conf->device_lock); | |
08464e09 N |
4105 | pr_warn("md/raid10:%s: array size must be reduce before number of disks\n", |
4106 | mdname(mddev)); | |
3ea7daa5 N |
4107 | return -EINVAL; |
4108 | } | |
4109 | mddev->resync_max_sectors = size; | |
4110 | conf->reshape_progress = size; | |
4111 | } else | |
4112 | conf->reshape_progress = 0; | |
299b0685 | 4113 | conf->reshape_safe = conf->reshape_progress; |
3ea7daa5 N |
4114 | spin_unlock_irq(&conf->device_lock); |
4115 | ||
bb63a701 N |
4116 | if (mddev->delta_disks && mddev->bitmap) { |
4117 | ret = bitmap_resize(mddev->bitmap, | |
4118 | raid10_size(mddev, 0, | |
4119 | conf->geo.raid_disks), | |
4120 | 0, 0); | |
4121 | if (ret) | |
4122 | goto abort; | |
4123 | } | |
3ea7daa5 N |
4124 | if (mddev->delta_disks > 0) { |
4125 | rdev_for_each(rdev, mddev) | |
4126 | if (rdev->raid_disk < 0 && | |
4127 | !test_bit(Faulty, &rdev->flags)) { | |
4128 | if (raid10_add_disk(mddev, rdev) == 0) { | |
4129 | if (rdev->raid_disk >= | |
4130 | conf->prev.raid_disks) | |
4131 | set_bit(In_sync, &rdev->flags); | |
4132 | else | |
4133 | rdev->recovery_offset = 0; | |
4134 | ||
4135 | if (sysfs_link_rdev(mddev, rdev)) | |
4136 | /* Failure here is OK */; | |
4137 | } | |
4138 | } else if (rdev->raid_disk >= conf->prev.raid_disks | |
4139 | && !test_bit(Faulty, &rdev->flags)) { | |
4140 | /* This is a spare that was manually added */ | |
4141 | set_bit(In_sync, &rdev->flags); | |
4142 | } | |
4143 | } | |
4144 | /* When a reshape changes the number of devices, | |
4145 | * ->degraded is measured against the larger of the | |
4146 | * pre and post numbers. | |
4147 | */ | |
4148 | spin_lock_irq(&conf->device_lock); | |
4149 | mddev->degraded = calc_degraded(conf); | |
4150 | spin_unlock_irq(&conf->device_lock); | |
4151 | mddev->raid_disks = conf->geo.raid_disks; | |
4152 | mddev->reshape_position = conf->reshape_progress; | |
2953079c | 4153 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
3ea7daa5 N |
4154 | |
4155 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4156 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
ea358cd0 | 4157 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
3ea7daa5 N |
4158 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
4159 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4160 | ||
4161 | mddev->sync_thread = md_register_thread(md_do_sync, mddev, | |
4162 | "reshape"); | |
4163 | if (!mddev->sync_thread) { | |
bb63a701 N |
4164 | ret = -EAGAIN; |
4165 | goto abort; | |
3ea7daa5 N |
4166 | } |
4167 | conf->reshape_checkpoint = jiffies; | |
4168 | md_wakeup_thread(mddev->sync_thread); | |
4169 | md_new_event(mddev); | |
4170 | return 0; | |
bb63a701 N |
4171 | |
4172 | abort: | |
4173 | mddev->recovery = 0; | |
4174 | spin_lock_irq(&conf->device_lock); | |
4175 | conf->geo = conf->prev; | |
4176 | mddev->raid_disks = conf->geo.raid_disks; | |
4177 | rdev_for_each(rdev, mddev) | |
4178 | rdev->new_data_offset = rdev->data_offset; | |
4179 | smp_wmb(); | |
4180 | conf->reshape_progress = MaxSector; | |
299b0685 | 4181 | conf->reshape_safe = MaxSector; |
bb63a701 N |
4182 | mddev->reshape_position = MaxSector; |
4183 | spin_unlock_irq(&conf->device_lock); | |
4184 | return ret; | |
3ea7daa5 N |
4185 | } |
4186 | ||
4187 | /* Calculate the last device-address that could contain | |
4188 | * any block from the chunk that includes the array-address 's' | |
4189 | * and report the next address. | |
4190 | * i.e. the address returned will be chunk-aligned and after | |
4191 | * any data that is in the chunk containing 's'. | |
4192 | */ | |
4193 | static sector_t last_dev_address(sector_t s, struct geom *geo) | |
4194 | { | |
4195 | s = (s | geo->chunk_mask) + 1; | |
4196 | s >>= geo->chunk_shift; | |
4197 | s *= geo->near_copies; | |
4198 | s = DIV_ROUND_UP_SECTOR_T(s, geo->raid_disks); | |
4199 | s *= geo->far_copies; | |
4200 | s <<= geo->chunk_shift; | |
4201 | return s; | |
4202 | } | |
4203 | ||
4204 | /* Calculate the first device-address that could contain | |
4205 | * any block from the chunk that includes the array-address 's'. | |
4206 | * This too will be the start of a chunk | |
4207 | */ | |
4208 | static sector_t first_dev_address(sector_t s, struct geom *geo) | |
4209 | { | |
4210 | s >>= geo->chunk_shift; | |
4211 | s *= geo->near_copies; | |
4212 | sector_div(s, geo->raid_disks); | |
4213 | s *= geo->far_copies; | |
4214 | s <<= geo->chunk_shift; | |
4215 | return s; | |
4216 | } | |
4217 | ||
4218 | static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, | |
4219 | int *skipped) | |
4220 | { | |
4221 | /* We simply copy at most one chunk (smallest of old and new) | |
4222 | * at a time, possibly less if that exceeds RESYNC_PAGES, | |
4223 | * or we hit a bad block or something. | |
4224 | * This might mean we pause for normal IO in the middle of | |
02ec5026 | 4225 | * a chunk, but that is not a problem as mddev->reshape_position |
3ea7daa5 N |
4226 | * can record any location. |
4227 | * | |
4228 | * If we will want to write to a location that isn't | |
4229 | * yet recorded as 'safe' (i.e. in metadata on disk) then | |
4230 | * we need to flush all reshape requests and update the metadata. | |
4231 | * | |
4232 | * When reshaping forwards (e.g. to more devices), we interpret | |
4233 | * 'safe' as the earliest block which might not have been copied | |
4234 | * down yet. We divide this by previous stripe size and multiply | |
4235 | * by previous stripe length to get lowest device offset that we | |
4236 | * cannot write to yet. | |
4237 | * We interpret 'sector_nr' as an address that we want to write to. | |
4238 | * From this we use last_device_address() to find where we might | |
4239 | * write to, and first_device_address on the 'safe' position. | |
4240 | * If this 'next' write position is after the 'safe' position, | |
4241 | * we must update the metadata to increase the 'safe' position. | |
4242 | * | |
4243 | * When reshaping backwards, we round in the opposite direction | |
4244 | * and perform the reverse test: next write position must not be | |
4245 | * less than current safe position. | |
4246 | * | |
4247 | * In all this the minimum difference in data offsets | |
4248 | * (conf->offset_diff - always positive) allows a bit of slack, | |
02ec5026 | 4249 | * so next can be after 'safe', but not by more than offset_diff |
3ea7daa5 N |
4250 | * |
4251 | * We need to prepare all the bios here before we start any IO | |
4252 | * to ensure the size we choose is acceptable to all devices. | |
4253 | * The means one for each copy for write-out and an extra one for | |
4254 | * read-in. | |
4255 | * We store the read-in bio in ->master_bio and the others in | |
4256 | * ->devs[x].bio and ->devs[x].repl_bio. | |
4257 | */ | |
4258 | struct r10conf *conf = mddev->private; | |
4259 | struct r10bio *r10_bio; | |
4260 | sector_t next, safe, last; | |
4261 | int max_sectors; | |
4262 | int nr_sectors; | |
4263 | int s; | |
4264 | struct md_rdev *rdev; | |
4265 | int need_flush = 0; | |
4266 | struct bio *blist; | |
4267 | struct bio *bio, *read_bio; | |
4268 | int sectors_done = 0; | |
f0250618 | 4269 | struct page **pages; |
3ea7daa5 N |
4270 | |
4271 | if (sector_nr == 0) { | |
4272 | /* If restarting in the middle, skip the initial sectors */ | |
4273 | if (mddev->reshape_backwards && | |
4274 | conf->reshape_progress < raid10_size(mddev, 0, 0)) { | |
4275 | sector_nr = (raid10_size(mddev, 0, 0) | |
4276 | - conf->reshape_progress); | |
4277 | } else if (!mddev->reshape_backwards && | |
4278 | conf->reshape_progress > 0) | |
4279 | sector_nr = conf->reshape_progress; | |
4280 | if (sector_nr) { | |
4281 | mddev->curr_resync_completed = sector_nr; | |
4282 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
4283 | *skipped = 1; | |
4284 | return sector_nr; | |
4285 | } | |
4286 | } | |
4287 | ||
4288 | /* We don't use sector_nr to track where we are up to | |
4289 | * as that doesn't work well for ->reshape_backwards. | |
4290 | * So just use ->reshape_progress. | |
4291 | */ | |
4292 | if (mddev->reshape_backwards) { | |
4293 | /* 'next' is the earliest device address that we might | |
4294 | * write to for this chunk in the new layout | |
4295 | */ | |
4296 | next = first_dev_address(conf->reshape_progress - 1, | |
4297 | &conf->geo); | |
4298 | ||
4299 | /* 'safe' is the last device address that we might read from | |
4300 | * in the old layout after a restart | |
4301 | */ | |
4302 | safe = last_dev_address(conf->reshape_safe - 1, | |
4303 | &conf->prev); | |
4304 | ||
4305 | if (next + conf->offset_diff < safe) | |
4306 | need_flush = 1; | |
4307 | ||
4308 | last = conf->reshape_progress - 1; | |
4309 | sector_nr = last & ~(sector_t)(conf->geo.chunk_mask | |
4310 | & conf->prev.chunk_mask); | |
4311 | if (sector_nr + RESYNC_BLOCK_SIZE/512 < last) | |
4312 | sector_nr = last + 1 - RESYNC_BLOCK_SIZE/512; | |
4313 | } else { | |
4314 | /* 'next' is after the last device address that we | |
4315 | * might write to for this chunk in the new layout | |
4316 | */ | |
4317 | next = last_dev_address(conf->reshape_progress, &conf->geo); | |
4318 | ||
4319 | /* 'safe' is the earliest device address that we might | |
4320 | * read from in the old layout after a restart | |
4321 | */ | |
4322 | safe = first_dev_address(conf->reshape_safe, &conf->prev); | |
4323 | ||
4324 | /* Need to update metadata if 'next' might be beyond 'safe' | |
4325 | * as that would possibly corrupt data | |
4326 | */ | |
4327 | if (next > safe + conf->offset_diff) | |
4328 | need_flush = 1; | |
4329 | ||
4330 | sector_nr = conf->reshape_progress; | |
4331 | last = sector_nr | (conf->geo.chunk_mask | |
4332 | & conf->prev.chunk_mask); | |
4333 | ||
4334 | if (sector_nr + RESYNC_BLOCK_SIZE/512 <= last) | |
4335 | last = sector_nr + RESYNC_BLOCK_SIZE/512 - 1; | |
4336 | } | |
4337 | ||
4338 | if (need_flush || | |
4339 | time_after(jiffies, conf->reshape_checkpoint + 10*HZ)) { | |
4340 | /* Need to update reshape_position in metadata */ | |
4341 | wait_barrier(conf); | |
4342 | mddev->reshape_position = conf->reshape_progress; | |
4343 | if (mddev->reshape_backwards) | |
4344 | mddev->curr_resync_completed = raid10_size(mddev, 0, 0) | |
4345 | - conf->reshape_progress; | |
4346 | else | |
4347 | mddev->curr_resync_completed = conf->reshape_progress; | |
4348 | conf->reshape_checkpoint = jiffies; | |
2953079c | 4349 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
3ea7daa5 | 4350 | md_wakeup_thread(mddev->thread); |
2953079c | 4351 | wait_event(mddev->sb_wait, mddev->sb_flags == 0 || |
c91abf5a N |
4352 | test_bit(MD_RECOVERY_INTR, &mddev->recovery)); |
4353 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4354 | allow_barrier(conf); | |
4355 | return sectors_done; | |
4356 | } | |
3ea7daa5 N |
4357 | conf->reshape_safe = mddev->reshape_position; |
4358 | allow_barrier(conf); | |
4359 | } | |
4360 | ||
4361 | read_more: | |
4362 | /* Now schedule reads for blocks from sector_nr to last */ | |
4363 | r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); | |
cb8b12b5 | 4364 | r10_bio->state = 0; |
3ea7daa5 N |
4365 | raise_barrier(conf, sectors_done != 0); |
4366 | atomic_set(&r10_bio->remaining, 0); | |
4367 | r10_bio->mddev = mddev; | |
4368 | r10_bio->sector = sector_nr; | |
4369 | set_bit(R10BIO_IsReshape, &r10_bio->state); | |
4370 | r10_bio->sectors = last - sector_nr + 1; | |
4371 | rdev = read_balance(conf, r10_bio, &max_sectors); | |
4372 | BUG_ON(!test_bit(R10BIO_Previous, &r10_bio->state)); | |
4373 | ||
4374 | if (!rdev) { | |
4375 | /* Cannot read from here, so need to record bad blocks | |
4376 | * on all the target devices. | |
4377 | */ | |
4378 | // FIXME | |
e337aead | 4379 | mempool_free(r10_bio, conf->r10buf_pool); |
3ea7daa5 N |
4380 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4381 | return sectors_done; | |
4382 | } | |
4383 | ||
4384 | read_bio = bio_alloc_mddev(GFP_KERNEL, RESYNC_PAGES, mddev); | |
4385 | ||
4386 | read_bio->bi_bdev = rdev->bdev; | |
4f024f37 | 4387 | read_bio->bi_iter.bi_sector = (r10_bio->devs[r10_bio->read_slot].addr |
3ea7daa5 N |
4388 | + rdev->data_offset); |
4389 | read_bio->bi_private = r10_bio; | |
81fa1520 | 4390 | read_bio->bi_end_io = end_reshape_read; |
796a5cf0 | 4391 | bio_set_op_attrs(read_bio, REQ_OP_READ, 0); |
ce0b0a46 | 4392 | read_bio->bi_flags &= (~0UL << BIO_RESET_BITS); |
4e4cbee9 | 4393 | read_bio->bi_status = 0; |
3ea7daa5 | 4394 | read_bio->bi_vcnt = 0; |
4f024f37 | 4395 | read_bio->bi_iter.bi_size = 0; |
3ea7daa5 N |
4396 | r10_bio->master_bio = read_bio; |
4397 | r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum; | |
4398 | ||
4399 | /* Now find the locations in the new layout */ | |
4400 | __raid10_find_phys(&conf->geo, r10_bio); | |
4401 | ||
4402 | blist = read_bio; | |
4403 | read_bio->bi_next = NULL; | |
4404 | ||
d094d686 | 4405 | rcu_read_lock(); |
3ea7daa5 N |
4406 | for (s = 0; s < conf->copies*2; s++) { |
4407 | struct bio *b; | |
4408 | int d = r10_bio->devs[s/2].devnum; | |
4409 | struct md_rdev *rdev2; | |
4410 | if (s&1) { | |
d094d686 | 4411 | rdev2 = rcu_dereference(conf->mirrors[d].replacement); |
3ea7daa5 N |
4412 | b = r10_bio->devs[s/2].repl_bio; |
4413 | } else { | |
d094d686 | 4414 | rdev2 = rcu_dereference(conf->mirrors[d].rdev); |
3ea7daa5 N |
4415 | b = r10_bio->devs[s/2].bio; |
4416 | } | |
4417 | if (!rdev2 || test_bit(Faulty, &rdev2->flags)) | |
4418 | continue; | |
8be185f2 | 4419 | |
3ea7daa5 | 4420 | b->bi_bdev = rdev2->bdev; |
4f024f37 KO |
4421 | b->bi_iter.bi_sector = r10_bio->devs[s/2].addr + |
4422 | rdev2->new_data_offset; | |
3ea7daa5 | 4423 | b->bi_end_io = end_reshape_write; |
796a5cf0 | 4424 | bio_set_op_attrs(b, REQ_OP_WRITE, 0); |
3ea7daa5 | 4425 | b->bi_next = blist; |
3ea7daa5 N |
4426 | blist = b; |
4427 | } | |
4428 | ||
4429 | /* Now add as many pages as possible to all of these bios. */ | |
4430 | ||
4431 | nr_sectors = 0; | |
f0250618 | 4432 | pages = get_resync_pages(r10_bio->devs[0].bio)->pages; |
3ea7daa5 | 4433 | for (s = 0 ; s < max_sectors; s += PAGE_SIZE >> 9) { |
f0250618 | 4434 | struct page *page = pages[s / (PAGE_SIZE >> 9)]; |
3ea7daa5 N |
4435 | int len = (max_sectors - s) << 9; |
4436 | if (len > PAGE_SIZE) | |
4437 | len = PAGE_SIZE; | |
4438 | for (bio = blist; bio ; bio = bio->bi_next) { | |
c85ba149 ML |
4439 | /* |
4440 | * won't fail because the vec table is big enough | |
4441 | * to hold all these pages | |
4442 | */ | |
4443 | bio_add_page(bio, page, len, 0); | |
3ea7daa5 N |
4444 | } |
4445 | sector_nr += len >> 9; | |
4446 | nr_sectors += len >> 9; | |
4447 | } | |
d094d686 | 4448 | rcu_read_unlock(); |
3ea7daa5 N |
4449 | r10_bio->sectors = nr_sectors; |
4450 | ||
4451 | /* Now submit the read */ | |
4452 | md_sync_acct(read_bio->bi_bdev, r10_bio->sectors); | |
4453 | atomic_inc(&r10_bio->remaining); | |
4454 | read_bio->bi_next = NULL; | |
4455 | generic_make_request(read_bio); | |
4456 | sector_nr += nr_sectors; | |
4457 | sectors_done += nr_sectors; | |
4458 | if (sector_nr <= last) | |
4459 | goto read_more; | |
4460 | ||
4461 | /* Now that we have done the whole section we can | |
4462 | * update reshape_progress | |
4463 | */ | |
4464 | if (mddev->reshape_backwards) | |
4465 | conf->reshape_progress -= sectors_done; | |
4466 | else | |
4467 | conf->reshape_progress += sectors_done; | |
4468 | ||
4469 | return sectors_done; | |
4470 | } | |
4471 | ||
4472 | static void end_reshape_request(struct r10bio *r10_bio); | |
4473 | static int handle_reshape_read_error(struct mddev *mddev, | |
4474 | struct r10bio *r10_bio); | |
4475 | static void reshape_request_write(struct mddev *mddev, struct r10bio *r10_bio) | |
4476 | { | |
4477 | /* Reshape read completed. Hopefully we have a block | |
4478 | * to write out. | |
4479 | * If we got a read error then we do sync 1-page reads from | |
4480 | * elsewhere until we find the data - or give up. | |
4481 | */ | |
4482 | struct r10conf *conf = mddev->private; | |
4483 | int s; | |
4484 | ||
4485 | if (!test_bit(R10BIO_Uptodate, &r10_bio->state)) | |
4486 | if (handle_reshape_read_error(mddev, r10_bio) < 0) { | |
4487 | /* Reshape has been aborted */ | |
4488 | md_done_sync(mddev, r10_bio->sectors, 0); | |
4489 | return; | |
4490 | } | |
4491 | ||
4492 | /* We definitely have the data in the pages, schedule the | |
4493 | * writes. | |
4494 | */ | |
4495 | atomic_set(&r10_bio->remaining, 1); | |
4496 | for (s = 0; s < conf->copies*2; s++) { | |
4497 | struct bio *b; | |
4498 | int d = r10_bio->devs[s/2].devnum; | |
4499 | struct md_rdev *rdev; | |
d094d686 | 4500 | rcu_read_lock(); |
3ea7daa5 | 4501 | if (s&1) { |
d094d686 | 4502 | rdev = rcu_dereference(conf->mirrors[d].replacement); |
3ea7daa5 N |
4503 | b = r10_bio->devs[s/2].repl_bio; |
4504 | } else { | |
d094d686 | 4505 | rdev = rcu_dereference(conf->mirrors[d].rdev); |
3ea7daa5 N |
4506 | b = r10_bio->devs[s/2].bio; |
4507 | } | |
d094d686 N |
4508 | if (!rdev || test_bit(Faulty, &rdev->flags)) { |
4509 | rcu_read_unlock(); | |
3ea7daa5 | 4510 | continue; |
d094d686 | 4511 | } |
3ea7daa5 | 4512 | atomic_inc(&rdev->nr_pending); |
d094d686 | 4513 | rcu_read_unlock(); |
3ea7daa5 N |
4514 | md_sync_acct(b->bi_bdev, r10_bio->sectors); |
4515 | atomic_inc(&r10_bio->remaining); | |
4516 | b->bi_next = NULL; | |
4517 | generic_make_request(b); | |
4518 | } | |
4519 | end_reshape_request(r10_bio); | |
4520 | } | |
4521 | ||
4522 | static void end_reshape(struct r10conf *conf) | |
4523 | { | |
4524 | if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) | |
4525 | return; | |
4526 | ||
4527 | spin_lock_irq(&conf->device_lock); | |
4528 | conf->prev = conf->geo; | |
4529 | md_finish_reshape(conf->mddev); | |
4530 | smp_wmb(); | |
4531 | conf->reshape_progress = MaxSector; | |
299b0685 | 4532 | conf->reshape_safe = MaxSector; |
3ea7daa5 N |
4533 | spin_unlock_irq(&conf->device_lock); |
4534 | ||
4535 | /* read-ahead size must cover two whole stripes, which is | |
4536 | * 2 * (datadisks) * chunksize where 'n' is the number of raid devices | |
4537 | */ | |
4538 | if (conf->mddev->queue) { | |
4539 | int stripe = conf->geo.raid_disks * | |
4540 | ((conf->mddev->chunk_sectors << 9) / PAGE_SIZE); | |
4541 | stripe /= conf->geo.near_copies; | |
dc3b17cc JK |
4542 | if (conf->mddev->queue->backing_dev_info->ra_pages < 2 * stripe) |
4543 | conf->mddev->queue->backing_dev_info->ra_pages = 2 * stripe; | |
3ea7daa5 N |
4544 | } |
4545 | conf->fullsync = 0; | |
4546 | } | |
4547 | ||
3ea7daa5 N |
4548 | static int handle_reshape_read_error(struct mddev *mddev, |
4549 | struct r10bio *r10_bio) | |
4550 | { | |
4551 | /* Use sync reads to get the blocks from somewhere else */ | |
4552 | int sectors = r10_bio->sectors; | |
3ea7daa5 | 4553 | struct r10conf *conf = mddev->private; |
e0ee7785 N |
4554 | struct { |
4555 | struct r10bio r10_bio; | |
4556 | struct r10dev devs[conf->copies]; | |
4557 | } on_stack; | |
4558 | struct r10bio *r10b = &on_stack.r10_bio; | |
3ea7daa5 N |
4559 | int slot = 0; |
4560 | int idx = 0; | |
2d06e3b7 ML |
4561 | struct page **pages; |
4562 | ||
4563 | /* reshape IOs share pages from .devs[0].bio */ | |
4564 | pages = get_resync_pages(r10_bio->devs[0].bio)->pages; | |
3ea7daa5 | 4565 | |
e0ee7785 N |
4566 | r10b->sector = r10_bio->sector; |
4567 | __raid10_find_phys(&conf->prev, r10b); | |
3ea7daa5 N |
4568 | |
4569 | while (sectors) { | |
4570 | int s = sectors; | |
4571 | int success = 0; | |
4572 | int first_slot = slot; | |
4573 | ||
4574 | if (s > (PAGE_SIZE >> 9)) | |
4575 | s = PAGE_SIZE >> 9; | |
4576 | ||
d094d686 | 4577 | rcu_read_lock(); |
3ea7daa5 | 4578 | while (!success) { |
e0ee7785 | 4579 | int d = r10b->devs[slot].devnum; |
d094d686 | 4580 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
3ea7daa5 N |
4581 | sector_t addr; |
4582 | if (rdev == NULL || | |
4583 | test_bit(Faulty, &rdev->flags) || | |
4584 | !test_bit(In_sync, &rdev->flags)) | |
4585 | goto failed; | |
4586 | ||
e0ee7785 | 4587 | addr = r10b->devs[slot].addr + idx * PAGE_SIZE; |
d094d686 N |
4588 | atomic_inc(&rdev->nr_pending); |
4589 | rcu_read_unlock(); | |
3ea7daa5 N |
4590 | success = sync_page_io(rdev, |
4591 | addr, | |
4592 | s << 9, | |
2d06e3b7 | 4593 | pages[idx], |
796a5cf0 | 4594 | REQ_OP_READ, 0, false); |
d094d686 N |
4595 | rdev_dec_pending(rdev, mddev); |
4596 | rcu_read_lock(); | |
3ea7daa5 N |
4597 | if (success) |
4598 | break; | |
4599 | failed: | |
4600 | slot++; | |
4601 | if (slot >= conf->copies) | |
4602 | slot = 0; | |
4603 | if (slot == first_slot) | |
4604 | break; | |
4605 | } | |
d094d686 | 4606 | rcu_read_unlock(); |
3ea7daa5 N |
4607 | if (!success) { |
4608 | /* couldn't read this block, must give up */ | |
4609 | set_bit(MD_RECOVERY_INTR, | |
4610 | &mddev->recovery); | |
4611 | return -EIO; | |
4612 | } | |
4613 | sectors -= s; | |
4614 | idx++; | |
4615 | } | |
4616 | return 0; | |
4617 | } | |
4618 | ||
4246a0b6 | 4619 | static void end_reshape_write(struct bio *bio) |
3ea7daa5 | 4620 | { |
f0250618 | 4621 | struct r10bio *r10_bio = get_resync_r10bio(bio); |
3ea7daa5 N |
4622 | struct mddev *mddev = r10_bio->mddev; |
4623 | struct r10conf *conf = mddev->private; | |
4624 | int d; | |
4625 | int slot; | |
4626 | int repl; | |
4627 | struct md_rdev *rdev = NULL; | |
4628 | ||
4629 | d = find_bio_disk(conf, r10_bio, bio, &slot, &repl); | |
4630 | if (repl) | |
4631 | rdev = conf->mirrors[d].replacement; | |
4632 | if (!rdev) { | |
4633 | smp_mb(); | |
4634 | rdev = conf->mirrors[d].rdev; | |
4635 | } | |
4636 | ||
4e4cbee9 | 4637 | if (bio->bi_status) { |
3ea7daa5 N |
4638 | /* FIXME should record badblock */ |
4639 | md_error(mddev, rdev); | |
4640 | } | |
4641 | ||
4642 | rdev_dec_pending(rdev, mddev); | |
4643 | end_reshape_request(r10_bio); | |
4644 | } | |
4645 | ||
4646 | static void end_reshape_request(struct r10bio *r10_bio) | |
4647 | { | |
4648 | if (!atomic_dec_and_test(&r10_bio->remaining)) | |
4649 | return; | |
4650 | md_done_sync(r10_bio->mddev, r10_bio->sectors, 1); | |
4651 | bio_put(r10_bio->master_bio); | |
4652 | put_buf(r10_bio); | |
4653 | } | |
4654 | ||
4655 | static void raid10_finish_reshape(struct mddev *mddev) | |
4656 | { | |
4657 | struct r10conf *conf = mddev->private; | |
4658 | ||
4659 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
4660 | return; | |
4661 | ||
4662 | if (mddev->delta_disks > 0) { | |
4663 | sector_t size = raid10_size(mddev, 0, 0); | |
4664 | md_set_array_sectors(mddev, size); | |
4665 | if (mddev->recovery_cp > mddev->resync_max_sectors) { | |
4666 | mddev->recovery_cp = mddev->resync_max_sectors; | |
4667 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4668 | } | |
4669 | mddev->resync_max_sectors = size; | |
859644f0 HM |
4670 | if (mddev->queue) { |
4671 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4672 | revalidate_disk(mddev->gendisk); | |
4673 | } | |
63aced61 N |
4674 | } else { |
4675 | int d; | |
d094d686 | 4676 | rcu_read_lock(); |
63aced61 N |
4677 | for (d = conf->geo.raid_disks ; |
4678 | d < conf->geo.raid_disks - mddev->delta_disks; | |
4679 | d++) { | |
d094d686 | 4680 | struct md_rdev *rdev = rcu_dereference(conf->mirrors[d].rdev); |
63aced61 N |
4681 | if (rdev) |
4682 | clear_bit(In_sync, &rdev->flags); | |
d094d686 | 4683 | rdev = rcu_dereference(conf->mirrors[d].replacement); |
63aced61 N |
4684 | if (rdev) |
4685 | clear_bit(In_sync, &rdev->flags); | |
4686 | } | |
d094d686 | 4687 | rcu_read_unlock(); |
3ea7daa5 N |
4688 | } |
4689 | mddev->layout = mddev->new_layout; | |
4690 | mddev->chunk_sectors = 1 << conf->geo.chunk_shift; | |
4691 | mddev->reshape_position = MaxSector; | |
4692 | mddev->delta_disks = 0; | |
4693 | mddev->reshape_backwards = 0; | |
4694 | } | |
4695 | ||
84fc4b56 | 4696 | static struct md_personality raid10_personality = |
1da177e4 LT |
4697 | { |
4698 | .name = "raid10", | |
2604b703 | 4699 | .level = 10, |
1da177e4 | 4700 | .owner = THIS_MODULE, |
849674e4 SL |
4701 | .make_request = raid10_make_request, |
4702 | .run = raid10_run, | |
afa0f557 | 4703 | .free = raid10_free, |
849674e4 SL |
4704 | .status = raid10_status, |
4705 | .error_handler = raid10_error, | |
1da177e4 LT |
4706 | .hot_add_disk = raid10_add_disk, |
4707 | .hot_remove_disk= raid10_remove_disk, | |
4708 | .spare_active = raid10_spare_active, | |
849674e4 | 4709 | .sync_request = raid10_sync_request, |
6cce3b23 | 4710 | .quiesce = raid10_quiesce, |
80c3a6ce | 4711 | .size = raid10_size, |
006a09a0 | 4712 | .resize = raid10_resize, |
dab8b292 | 4713 | .takeover = raid10_takeover, |
3ea7daa5 N |
4714 | .check_reshape = raid10_check_reshape, |
4715 | .start_reshape = raid10_start_reshape, | |
4716 | .finish_reshape = raid10_finish_reshape, | |
5c675f83 | 4717 | .congested = raid10_congested, |
1da177e4 LT |
4718 | }; |
4719 | ||
4720 | static int __init raid_init(void) | |
4721 | { | |
2604b703 | 4722 | return register_md_personality(&raid10_personality); |
1da177e4 LT |
4723 | } |
4724 | ||
4725 | static void raid_exit(void) | |
4726 | { | |
2604b703 | 4727 | unregister_md_personality(&raid10_personality); |
1da177e4 LT |
4728 | } |
4729 | ||
4730 | module_init(raid_init); | |
4731 | module_exit(raid_exit); | |
4732 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 4733 | MODULE_DESCRIPTION("RAID10 (striped mirror) personality for MD"); |
1da177e4 | 4734 | MODULE_ALIAS("md-personality-9"); /* RAID10 */ |
d9d166c2 | 4735 | MODULE_ALIAS("md-raid10"); |
2604b703 | 4736 | MODULE_ALIAS("md-level-10"); |
34db0cd6 N |
4737 | |
4738 | module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); |