Commit | Line | Data |
---|---|---|
af1a8899 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | raid0.c : Multiple Devices driver for Linux | |
f72ffdd6 | 4 | Copyright (C) 1994-96 Marc ZYNGIER |
1da177e4 LT |
5 | <zyngier@ufr-info-p7.ibp.fr> or |
6 | <maz@gloups.fdn.fr> | |
f72ffdd6 | 7 | Copyright (C) 1999, 2000 Ingo Molnar, Red Hat |
1da177e4 LT |
8 | |
9 | RAID-0 management functions. | |
10 | ||
1da177e4 LT |
11 | */ |
12 | ||
bff61975 | 13 | #include <linux/blkdev.h> |
bff61975 | 14 | #include <linux/seq_file.h> |
056075c7 | 15 | #include <linux/module.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
109e3765 | 17 | #include <trace/events/block.h> |
43b2e5d8 | 18 | #include "md.h" |
ef740c37 | 19 | #include "raid0.h" |
9af204cf | 20 | #include "raid5.h" |
1da177e4 | 21 | |
c84a1372 N |
22 | static int default_layout = 0; |
23 | module_param(default_layout, int, 0644); | |
24 | ||
394ed8e4 SL |
25 | #define UNSUPPORTED_MDDEV_FLAGS \ |
26 | ((1L << MD_HAS_JOURNAL) | \ | |
27 | (1L << MD_JOURNAL_CLEAN) | \ | |
ea0213e0 | 28 | (1L << MD_FAILFAST_SUPPORTED) |\ |
ddc08823 PB |
29 | (1L << MD_HAS_PPL) | \ |
30 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 31 | |
46994191 | 32 | /* |
33 | * inform the user of the raid configuration | |
34 | */ | |
fd01b88c | 35 | static void dump_zones(struct mddev *mddev) |
46994191 | 36 | { |
50de8df4 | 37 | int j, k; |
46994191 | 38 | sector_t zone_size = 0; |
39 | sector_t zone_start = 0; | |
40 | char b[BDEVNAME_SIZE]; | |
e373ab10 | 41 | struct r0conf *conf = mddev->private; |
84707f38 | 42 | int raid_disks = conf->strip_zone[0].nb_dev; |
76603884 N |
43 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
44 | mdname(mddev), | |
45 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); | |
46994191 | 46 | for (j = 0; j < conf->nr_strip_zones; j++) { |
76603884 N |
47 | char line[200]; |
48 | int len = 0; | |
49 | ||
46994191 | 50 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
76603884 N |
51 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
52 | bdevname(conf->devlist[j*raid_disks | |
53 | + k]->bdev, b)); | |
54 | pr_debug("md: zone%d=[%s]\n", j, line); | |
46994191 | 55 | |
56 | zone_size = conf->strip_zone[j].zone_end - zone_start; | |
76603884 | 57 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
46994191 | 58 | (unsigned long long)zone_start>>1, |
59 | (unsigned long long)conf->strip_zone[j].dev_start>>1, | |
60 | (unsigned long long)zone_size>>1); | |
61 | zone_start = conf->strip_zone[j].zone_end; | |
62 | } | |
46994191 | 63 | } |
64 | ||
e373ab10 | 65 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
1da177e4 | 66 | { |
a9f326eb | 67 | int i, c, err; |
49f357a2 | 68 | sector_t curr_zone_end, sectors; |
3cb03002 | 69 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
1da177e4 LT |
70 | struct strip_zone *zone; |
71 | int cnt; | |
72 | char b[BDEVNAME_SIZE]; | |
50de8df4 | 73 | char b2[BDEVNAME_SIZE]; |
e373ab10 | 74 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
ad6bf88a | 75 | unsigned blksize = 512; |
ed7b0038 | 76 | |
7dedd15d | 77 | *private_conf = ERR_PTR(-ENOMEM); |
ed7b0038 AN |
78 | if (!conf) |
79 | return -ENOMEM; | |
dafb20fa | 80 | rdev_for_each(rdev1, mddev) { |
50de8df4 N |
81 | pr_debug("md/raid0:%s: looking at %s\n", |
82 | mdname(mddev), | |
83 | bdevname(rdev1->bdev, b)); | |
1da177e4 | 84 | c = 0; |
13f2682b N |
85 | |
86 | /* round size to chunk_size */ | |
87 | sectors = rdev1->sectors; | |
88 | sector_div(sectors, mddev->chunk_sectors); | |
89 | rdev1->sectors = sectors * mddev->chunk_sectors; | |
90 | ||
199dc6ed N |
91 | blksize = max(blksize, queue_logical_block_size( |
92 | rdev1->bdev->bd_disk->queue)); | |
93 | ||
dafb20fa | 94 | rdev_for_each(rdev2, mddev) { |
50de8df4 N |
95 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
96 | " with %s(%llu)\n", | |
97 | mdname(mddev), | |
98 | bdevname(rdev1->bdev,b), | |
99 | (unsigned long long)rdev1->sectors, | |
100 | bdevname(rdev2->bdev,b2), | |
101 | (unsigned long long)rdev2->sectors); | |
1da177e4 | 102 | if (rdev2 == rdev1) { |
50de8df4 N |
103 | pr_debug("md/raid0:%s: END\n", |
104 | mdname(mddev)); | |
1da177e4 LT |
105 | break; |
106 | } | |
dd8ac336 | 107 | if (rdev2->sectors == rdev1->sectors) { |
1da177e4 LT |
108 | /* |
109 | * Not unique, don't count it as a new | |
110 | * group | |
111 | */ | |
50de8df4 N |
112 | pr_debug("md/raid0:%s: EQUAL\n", |
113 | mdname(mddev)); | |
1da177e4 LT |
114 | c = 1; |
115 | break; | |
116 | } | |
50de8df4 N |
117 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
118 | mdname(mddev)); | |
1da177e4 LT |
119 | } |
120 | if (!c) { | |
50de8df4 N |
121 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
122 | mdname(mddev)); | |
1da177e4 | 123 | conf->nr_strip_zones++; |
50de8df4 N |
124 | pr_debug("md/raid0:%s: %d zones\n", |
125 | mdname(mddev), conf->nr_strip_zones); | |
1da177e4 LT |
126 | } |
127 | } | |
50de8df4 N |
128 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
129 | mdname(mddev), conf->nr_strip_zones); | |
c84a1372 | 130 | |
199dc6ed N |
131 | /* |
132 | * now since we have the hard sector sizes, we can make sure | |
133 | * chunk size is a multiple of that sector size | |
134 | */ | |
135 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
136 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
137 | mdname(mddev), | |
138 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
139 | err = -EINVAL; |
140 | goto abort; | |
141 | } | |
142 | ||
ed7b0038 | 143 | err = -ENOMEM; |
6396bb22 KC |
144 | conf->strip_zone = kcalloc(conf->nr_strip_zones, |
145 | sizeof(struct strip_zone), | |
146 | GFP_KERNEL); | |
1da177e4 | 147 | if (!conf->strip_zone) |
ed7b0038 | 148 | goto abort; |
6396bb22 KC |
149 | conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), |
150 | conf->nr_strip_zones, | |
151 | mddev->raid_disks), | |
1da177e4 LT |
152 | GFP_KERNEL); |
153 | if (!conf->devlist) | |
ed7b0038 | 154 | goto abort; |
1da177e4 | 155 | |
1da177e4 LT |
156 | /* The first zone must contain all devices, so here we check that |
157 | * there is a proper alignment of slots to devices and find them all | |
158 | */ | |
159 | zone = &conf->strip_zone[0]; | |
160 | cnt = 0; | |
161 | smallest = NULL; | |
b414579f | 162 | dev = conf->devlist; |
ed7b0038 | 163 | err = -EINVAL; |
dafb20fa | 164 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
165 | int j = rdev1->raid_disk; |
166 | ||
e93f68a1 | 167 | if (mddev->level == 10) { |
9af204cf TM |
168 | /* taking over a raid10-n2 array */ |
169 | j /= 2; | |
e93f68a1 N |
170 | rdev1->new_raid_disk = j; |
171 | } | |
9af204cf | 172 | |
fc3a08b8 KW |
173 | if (mddev->level == 1) { |
174 | /* taiking over a raid1 array- | |
175 | * we have only one active disk | |
176 | */ | |
177 | j = 0; | |
178 | rdev1->new_raid_disk = j; | |
179 | } | |
180 | ||
f96c9f30 | 181 | if (j < 0) { |
76603884 N |
182 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
183 | mdname(mddev)); | |
f96c9f30 N |
184 | goto abort; |
185 | } | |
186 | if (j >= mddev->raid_disks) { | |
76603884 N |
187 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
188 | mdname(mddev), j); | |
1da177e4 LT |
189 | goto abort; |
190 | } | |
b414579f | 191 | if (dev[j]) { |
76603884 N |
192 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
193 | mdname(mddev), j); | |
1da177e4 LT |
194 | goto abort; |
195 | } | |
b414579f | 196 | dev[j] = rdev1; |
1da177e4 | 197 | |
dd8ac336 | 198 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
199 | smallest = rdev1; |
200 | cnt++; | |
201 | } | |
202 | if (cnt != mddev->raid_disks) { | |
76603884 N |
203 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
204 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
205 | goto abort; |
206 | } | |
207 | zone->nb_dev = cnt; | |
49f357a2 | 208 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 209 | |
49f357a2 | 210 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
211 | |
212 | /* now do the other zones */ | |
213 | for (i = 1; i < conf->nr_strip_zones; i++) | |
214 | { | |
a9f326eb N |
215 | int j; |
216 | ||
1da177e4 | 217 | zone = conf->strip_zone + i; |
b414579f | 218 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 219 | |
50de8df4 | 220 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 221 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
222 | smallest = NULL; |
223 | c = 0; | |
224 | ||
225 | for (j=0; j<cnt; j++) { | |
b414579f | 226 | rdev = conf->devlist[j]; |
d27a43ab | 227 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
228 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
229 | mdname(mddev), | |
230 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
231 | continue; |
232 | } | |
50de8df4 N |
233 | pr_debug("md/raid0:%s: checking %s ..." |
234 | " contained as device %d\n", | |
235 | mdname(mddev), | |
236 | bdevname(rdev->bdev, b), c); | |
b414579f | 237 | dev[c] = rdev; |
dd8ac336 AN |
238 | c++; |
239 | if (!smallest || rdev->sectors < smallest->sectors) { | |
240 | smallest = rdev; | |
50de8df4 N |
241 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
242 | mdname(mddev), | |
243 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 244 | } |
1da177e4 LT |
245 | } |
246 | ||
247 | zone->nb_dev = c; | |
49f357a2 | 248 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
249 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
250 | mdname(mddev), | |
251 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 252 | |
49f357a2 | 253 | curr_zone_end += sectors; |
d27a43ab | 254 | zone->zone_end = curr_zone_end; |
1da177e4 | 255 | |
50de8df4 N |
256 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
257 | mdname(mddev), | |
258 | (unsigned long long)smallest->sectors); | |
1da177e4 | 259 | } |
1da177e4 | 260 | |
ea23994e PH |
261 | if (conf->nr_strip_zones == 1 || conf->strip_zone[1].nb_dev == 1) { |
262 | conf->layout = RAID0_ORIG_LAYOUT; | |
263 | } else if (mddev->layout == RAID0_ORIG_LAYOUT || | |
264 | mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
265 | conf->layout = mddev->layout; | |
266 | } else if (default_layout == RAID0_ORIG_LAYOUT || | |
267 | default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
268 | conf->layout = default_layout; | |
269 | } else { | |
270 | pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n", | |
271 | mdname(mddev)); | |
272 | pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n"); | |
273 | err = -EOPNOTSUPP; | |
274 | goto abort; | |
275 | } | |
276 | ||
50de8df4 | 277 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
9af204cf TM |
278 | *private_conf = conf; |
279 | ||
1da177e4 | 280 | return 0; |
5568a603 | 281 | abort: |
ed7b0038 AN |
282 | kfree(conf->strip_zone); |
283 | kfree(conf->devlist); | |
284 | kfree(conf); | |
58ebb34c | 285 | *private_conf = ERR_PTR(err); |
ed7b0038 | 286 | return err; |
1da177e4 LT |
287 | } |
288 | ||
ba13da47 N |
289 | /* Find the zone which holds a particular offset |
290 | * Update *sectorp to be an offset in that zone | |
291 | */ | |
292 | static struct strip_zone *find_zone(struct r0conf *conf, | |
293 | sector_t *sectorp) | |
294 | { | |
295 | int i; | |
296 | struct strip_zone *z = conf->strip_zone; | |
297 | sector_t sector = *sectorp; | |
298 | ||
299 | for (i = 0; i < conf->nr_strip_zones; i++) | |
300 | if (sector < z[i].zone_end) { | |
301 | if (i) | |
302 | *sectorp = sector - z[i-1].zone_end; | |
303 | return z + i; | |
304 | } | |
305 | BUG(); | |
306 | } | |
307 | ||
308 | /* | |
309 | * remaps the bio to the target device. we separate two flows. | |
47d68979 | 310 | * power 2 flow and a general flow for the sake of performance |
ba13da47 N |
311 | */ |
312 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, | |
313 | sector_t sector, sector_t *sector_offset) | |
314 | { | |
315 | unsigned int sect_in_chunk; | |
316 | sector_t chunk; | |
317 | struct r0conf *conf = mddev->private; | |
318 | int raid_disks = conf->strip_zone[0].nb_dev; | |
319 | unsigned int chunk_sects = mddev->chunk_sectors; | |
320 | ||
321 | if (is_power_of_2(chunk_sects)) { | |
322 | int chunksect_bits = ffz(~chunk_sects); | |
323 | /* find the sector offset inside the chunk */ | |
324 | sect_in_chunk = sector & (chunk_sects - 1); | |
325 | sector >>= chunksect_bits; | |
326 | /* chunk in zone */ | |
327 | chunk = *sector_offset; | |
328 | /* quotient is the chunk in real device*/ | |
329 | sector_div(chunk, zone->nb_dev << chunksect_bits); | |
330 | } else{ | |
331 | sect_in_chunk = sector_div(sector, chunk_sects); | |
332 | chunk = *sector_offset; | |
333 | sector_div(chunk, chunk_sects * zone->nb_dev); | |
334 | } | |
335 | /* | |
336 | * position the bio over the real device | |
337 | * real sector = chunk in device + starting of zone | |
338 | * + the position in the chunk | |
339 | */ | |
340 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; | |
341 | return conf->devlist[(zone - conf->strip_zone)*raid_disks | |
342 | + sector_div(sector, zone->nb_dev)]; | |
343 | } | |
344 | ||
fd01b88c | 345 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
346 | { |
347 | sector_t array_sectors = 0; | |
3cb03002 | 348 | struct md_rdev *rdev; |
80c3a6ce DW |
349 | |
350 | WARN_ONCE(sectors || raid_disks, | |
351 | "%s does not support generic reshape\n", __func__); | |
352 | ||
dafb20fa | 353 | rdev_for_each(rdev, mddev) |
a6468539 N |
354 | array_sectors += (rdev->sectors & |
355 | ~(sector_t)(mddev->chunk_sectors-1)); | |
80c3a6ce DW |
356 | |
357 | return array_sectors; | |
358 | } | |
359 | ||
0c031fd3 XN |
360 | static void free_conf(struct mddev *mddev, struct r0conf *conf) |
361 | { | |
362 | kfree(conf->strip_zone); | |
363 | kfree(conf->devlist); | |
364 | kfree(conf); | |
365 | mddev->private = NULL; | |
366 | } | |
367 | ||
368 | static void raid0_free(struct mddev *mddev, void *priv) | |
369 | { | |
370 | struct r0conf *conf = priv; | |
371 | ||
372 | free_conf(mddev, conf); | |
373 | acct_bioset_exit(mddev); | |
374 | } | |
0366ef84 | 375 | |
fd01b88c | 376 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 377 | { |
e373ab10 | 378 | struct r0conf *conf; |
5568a603 | 379 | int ret; |
1da177e4 | 380 | |
9d8f0363 | 381 | if (mddev->chunk_sectors == 0) { |
76603884 | 382 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
383 | return -EINVAL; |
384 | } | |
0894cc30 AN |
385 | if (md_check_no_bitmap(mddev)) |
386 | return -EINVAL; | |
753f2856 | 387 | |
0c031fd3 XN |
388 | if (acct_bioset_init(mddev)) { |
389 | pr_err("md/raid0:%s: alloc acct bioset failed.\n", mdname(mddev)); | |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
9af204cf TM |
393 | /* if private is not null, we are here after takeover */ |
394 | if (mddev->private == NULL) { | |
395 | ret = create_strip_zones(mddev, &conf); | |
396 | if (ret < 0) | |
0c031fd3 | 397 | goto exit_acct_set; |
9af204cf TM |
398 | mddev->private = conf; |
399 | } | |
400 | conf = mddev->private; | |
199dc6ed N |
401 | if (mddev->queue) { |
402 | struct md_rdev *rdev; | |
199dc6ed | 403 | |
199dc6ed | 404 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
3deff1a7 | 405 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 406 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
407 | |
408 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
409 | blk_queue_io_opt(mddev->queue, | |
410 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
411 | ||
66eefe5d N |
412 | rdev_for_each(rdev, mddev) { |
413 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
414 | rdev->data_offset << 9); | |
66eefe5d | 415 | } |
199dc6ed | 416 | } |
1da177e4 LT |
417 | |
418 | /* calculate array device size */ | |
1f403624 | 419 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 420 | |
76603884 N |
421 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
422 | mdname(mddev), | |
423 | (unsigned long long)mddev->array_sectors); | |
753f2856 | 424 | |
46994191 | 425 | dump_zones(mddev); |
0366ef84 | 426 | |
427 | ret = md_integrity_register(mddev); | |
0c031fd3 XN |
428 | if (ret) |
429 | goto free; | |
0366ef84 | 430 | |
431 | return ret; | |
1da177e4 | 432 | |
0c031fd3 XN |
433 | free: |
434 | free_conf(mddev, conf); | |
435 | exit_acct_set: | |
436 | acct_bioset_exit(mddev); | |
437 | return ret; | |
1da177e4 LT |
438 | } |
439 | ||
29efc390 SL |
440 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
441 | { | |
442 | struct r0conf *conf = mddev->private; | |
443 | struct strip_zone *zone; | |
444 | sector_t start = bio->bi_iter.bi_sector; | |
445 | sector_t end; | |
446 | unsigned int stripe_size; | |
447 | sector_t first_stripe_index, last_stripe_index; | |
448 | sector_t start_disk_offset; | |
449 | unsigned int start_disk_index; | |
450 | sector_t end_disk_offset; | |
451 | unsigned int end_disk_index; | |
452 | unsigned int disk; | |
453 | ||
454 | zone = find_zone(conf, &start); | |
455 | ||
456 | if (bio_end_sector(bio) > zone->zone_end) { | |
457 | struct bio *split = bio_split(bio, | |
458 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
afeee514 | 459 | &mddev->bio_set); |
29efc390 | 460 | bio_chain(split, bio); |
ed00aabd | 461 | submit_bio_noacct(bio); |
29efc390 SL |
462 | bio = split; |
463 | end = zone->zone_end; | |
464 | } else | |
465 | end = bio_end_sector(bio); | |
466 | ||
467 | if (zone != conf->strip_zone) | |
468 | end = end - zone[-1].zone_end; | |
469 | ||
470 | /* Now start and end is the offset in zone */ | |
471 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
472 | ||
473 | first_stripe_index = start; | |
474 | sector_div(first_stripe_index, stripe_size); | |
475 | last_stripe_index = end; | |
476 | sector_div(last_stripe_index, stripe_size); | |
477 | ||
478 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
479 | mddev->chunk_sectors; | |
480 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
481 | mddev->chunk_sectors) + | |
482 | first_stripe_index * mddev->chunk_sectors; | |
483 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
484 | mddev->chunk_sectors; | |
485 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
486 | mddev->chunk_sectors) + | |
487 | last_stripe_index * mddev->chunk_sectors; | |
488 | ||
489 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
490 | sector_t dev_start, dev_end; | |
29efc390 SL |
491 | struct md_rdev *rdev; |
492 | ||
493 | if (disk < start_disk_index) | |
494 | dev_start = (first_stripe_index + 1) * | |
495 | mddev->chunk_sectors; | |
496 | else if (disk > start_disk_index) | |
497 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
498 | else | |
499 | dev_start = start_disk_offset; | |
500 | ||
501 | if (disk < end_disk_index) | |
502 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
503 | else if (disk > end_disk_index) | |
504 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
505 | else | |
506 | dev_end = end_disk_offset; | |
507 | ||
508 | if (dev_end <= dev_start) | |
509 | continue; | |
510 | ||
511 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
512 | conf->strip_zone[0].nb_dev + disk]; | |
cf78408f | 513 | md_submit_discard_bio(mddev, rdev, bio, |
29efc390 | 514 | dev_start + zone->dev_start + rdev->data_offset, |
cf78408f | 515 | dev_end - dev_start); |
29efc390 SL |
516 | } |
517 | bio_endio(bio); | |
518 | } | |
519 | ||
cc27b0c7 | 520 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 521 | { |
c84a1372 | 522 | struct r0conf *conf = mddev->private; |
1da177e4 | 523 | struct strip_zone *zone; |
3cb03002 | 524 | struct md_rdev *tmp_dev; |
f00d7c85 N |
525 | sector_t bio_sector; |
526 | sector_t sector; | |
c84a1372 | 527 | sector_t orig_sector; |
f00d7c85 N |
528 | unsigned chunk_sects; |
529 | unsigned sectors; | |
1da177e4 | 530 | |
775d7831 DJ |
531 | if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
532 | && md_flush_request(mddev, bio)) | |
cc27b0c7 | 533 | return true; |
e5dcdd80 | 534 | |
29efc390 SL |
535 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
536 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 537 | return true; |
29efc390 SL |
538 | } |
539 | ||
f00d7c85 N |
540 | bio_sector = bio->bi_iter.bi_sector; |
541 | sector = bio_sector; | |
542 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 543 | |
f00d7c85 N |
544 | sectors = chunk_sects - |
545 | (likely(is_power_of_2(chunk_sects)) | |
546 | ? (sector & (chunk_sects-1)) | |
547 | : sector_div(sector, chunk_sects)); | |
20d0189b | 548 | |
f00d7c85 N |
549 | /* Restore due to sector_div */ |
550 | sector = bio_sector; | |
a8115776 | 551 | |
f00d7c85 | 552 | if (sectors < bio_sectors(bio)) { |
afeee514 KO |
553 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, |
554 | &mddev->bio_set); | |
f00d7c85 | 555 | bio_chain(split, bio); |
ed00aabd | 556 | submit_bio_noacct(bio); |
f00d7c85 N |
557 | bio = split; |
558 | } | |
1da177e4 | 559 | |
10764815 GJ |
560 | if (bio->bi_pool != &mddev->bio_set) |
561 | md_account_bio(mddev, &bio); | |
562 | ||
c84a1372 | 563 | orig_sector = sector; |
f00d7c85 | 564 | zone = find_zone(mddev->private, §or); |
c84a1372 N |
565 | switch (conf->layout) { |
566 | case RAID0_ORIG_LAYOUT: | |
567 | tmp_dev = map_sector(mddev, zone, orig_sector, §or); | |
568 | break; | |
569 | case RAID0_ALT_MULTIZONE_LAYOUT: | |
570 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
571 | break; | |
572 | default: | |
e3fc3f3d | 573 | WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); |
c84a1372 N |
574 | bio_io_error(bio); |
575 | return true; | |
576 | } | |
62f7b198 GP |
577 | |
578 | if (unlikely(is_mddev_broken(tmp_dev, "raid0"))) { | |
579 | bio_io_error(bio); | |
580 | return true; | |
581 | } | |
582 | ||
74d46992 | 583 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
584 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
585 | tmp_dev->data_offset; | |
586 | ||
29efc390 | 587 | if (mddev->gendisk) |
1c02fca6 CH |
588 | trace_block_bio_remap(bio, disk_devt(mddev->gendisk), |
589 | bio_sector); | |
29efc390 | 590 | mddev_check_write_zeroes(mddev, bio); |
ed00aabd | 591 | submit_bio_noacct(bio); |
cc27b0c7 | 592 | return true; |
1da177e4 | 593 | } |
8299d7f7 | 594 | |
fd01b88c | 595 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 596 | { |
9d8f0363 | 597 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
598 | return; |
599 | } | |
600 | ||
fd01b88c | 601 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 602 | { |
3cb03002 | 603 | struct md_rdev *rdev; |
e373ab10 | 604 | struct r0conf *priv_conf; |
9af204cf TM |
605 | |
606 | if (mddev->degraded != 1) { | |
76603884 N |
607 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
608 | mdname(mddev), | |
609 | mddev->degraded); | |
9af204cf TM |
610 | return ERR_PTR(-EINVAL); |
611 | } | |
612 | ||
dafb20fa | 613 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
614 | /* check slot number for a disk */ |
615 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
616 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
617 | mdname(mddev)); | |
9af204cf TM |
618 | return ERR_PTR(-EINVAL); |
619 | } | |
eea136d6 | 620 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
621 | } |
622 | ||
623 | /* Set new parameters */ | |
624 | mddev->new_level = 0; | |
001048a3 | 625 | mddev->new_layout = 0; |
9af204cf TM |
626 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
627 | mddev->raid_disks--; | |
628 | mddev->delta_disks = -1; | |
629 | /* make sure it will be not marked as dirty */ | |
630 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 631 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
632 | |
633 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 634 | |
9af204cf TM |
635 | return priv_conf; |
636 | } | |
637 | ||
fd01b88c | 638 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 639 | { |
e373ab10 | 640 | struct r0conf *priv_conf; |
9af204cf TM |
641 | |
642 | /* Check layout: | |
643 | * - far_copies must be 1 | |
644 | * - near_copies must be 2 | |
645 | * - disks number must be even | |
646 | * - all mirrors must be already degraded | |
647 | */ | |
648 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
649 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
650 | mdname(mddev), | |
651 | mddev->layout); | |
9af204cf TM |
652 | return ERR_PTR(-EINVAL); |
653 | } | |
654 | if (mddev->raid_disks & 1) { | |
76603884 N |
655 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
656 | mdname(mddev)); | |
9af204cf TM |
657 | return ERR_PTR(-EINVAL); |
658 | } | |
659 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
660 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
661 | mdname(mddev)); | |
9af204cf TM |
662 | return ERR_PTR(-EINVAL); |
663 | } | |
664 | ||
665 | /* Set new parameters */ | |
666 | mddev->new_level = 0; | |
001048a3 | 667 | mddev->new_layout = 0; |
9af204cf TM |
668 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
669 | mddev->delta_disks = - mddev->raid_disks / 2; | |
670 | mddev->raid_disks += mddev->delta_disks; | |
671 | mddev->degraded = 0; | |
672 | /* make sure it will be not marked as dirty */ | |
673 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 674 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
675 | |
676 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
677 | return priv_conf; |
678 | } | |
679 | ||
fd01b88c | 680 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 681 | { |
e373ab10 | 682 | struct r0conf *priv_conf; |
24b961f8 | 683 | int chunksect; |
fc3a08b8 KW |
684 | |
685 | /* Check layout: | |
686 | * - (N - 1) mirror drives must be already faulty | |
687 | */ | |
688 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 689 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
690 | mdname(mddev)); |
691 | return ERR_PTR(-EINVAL); | |
692 | } | |
693 | ||
24b961f8 JS |
694 | /* |
695 | * a raid1 doesn't have the notion of chunk size, so | |
696 | * figure out the largest suitable size we can use. | |
697 | */ | |
698 | chunksect = 64 * 2; /* 64K by default */ | |
699 | ||
700 | /* The array must be an exact multiple of chunksize */ | |
701 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
702 | chunksect >>= 1; | |
703 | ||
704 | if ((chunksect << 9) < PAGE_SIZE) | |
705 | /* array size does not allow a suitable chunk size */ | |
706 | return ERR_PTR(-EINVAL); | |
707 | ||
fc3a08b8 KW |
708 | /* Set new parameters */ |
709 | mddev->new_level = 0; | |
710 | mddev->new_layout = 0; | |
24b961f8 JS |
711 | mddev->new_chunk_sectors = chunksect; |
712 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 713 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 714 | mddev->raid_disks = 1; |
fc3a08b8 KW |
715 | /* make sure it will be not marked as dirty */ |
716 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 717 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
718 | |
719 | create_strip_zones(mddev, &priv_conf); | |
720 | return priv_conf; | |
721 | } | |
722 | ||
fd01b88c | 723 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
724 | { |
725 | /* raid0 can take over: | |
049d6c1e | 726 | * raid4 - if all data disks are active. |
9af204cf TM |
727 | * raid5 - providing it is Raid4 layout and one disk is faulty |
728 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 729 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 730 | */ |
a8461a61 N |
731 | |
732 | if (mddev->bitmap) { | |
76603884 N |
733 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
734 | mdname(mddev)); | |
a8461a61 N |
735 | return ERR_PTR(-EBUSY); |
736 | } | |
049d6c1e MT |
737 | if (mddev->level == 4) |
738 | return raid0_takeover_raid45(mddev); | |
739 | ||
9af204cf TM |
740 | if (mddev->level == 5) { |
741 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 742 | return raid0_takeover_raid45(mddev); |
9af204cf | 743 | |
76603884 N |
744 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
745 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
746 | } |
747 | ||
748 | if (mddev->level == 10) | |
749 | return raid0_takeover_raid10(mddev); | |
750 | ||
fc3a08b8 KW |
751 | if (mddev->level == 1) |
752 | return raid0_takeover_raid1(mddev); | |
753 | ||
76603884 | 754 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
755 | mddev->level); |
756 | ||
9af204cf TM |
757 | return ERR_PTR(-EINVAL); |
758 | } | |
759 | ||
b03e0ccb | 760 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
761 | { |
762 | } | |
763 | ||
84fc4b56 | 764 | static struct md_personality raid0_personality= |
1da177e4 LT |
765 | { |
766 | .name = "raid0", | |
2604b703 | 767 | .level = 0, |
1da177e4 LT |
768 | .owner = THIS_MODULE, |
769 | .make_request = raid0_make_request, | |
770 | .run = raid0_run, | |
afa0f557 | 771 | .free = raid0_free, |
1da177e4 | 772 | .status = raid0_status, |
80c3a6ce | 773 | .size = raid0_size, |
9af204cf TM |
774 | .takeover = raid0_takeover, |
775 | .quiesce = raid0_quiesce, | |
1da177e4 LT |
776 | }; |
777 | ||
778 | static int __init raid0_init (void) | |
779 | { | |
2604b703 | 780 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
781 | } |
782 | ||
783 | static void raid0_exit (void) | |
784 | { | |
2604b703 | 785 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
786 | } |
787 | ||
788 | module_init(raid0_init); | |
789 | module_exit(raid0_exit); | |
790 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 791 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 792 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 793 | MODULE_ALIAS("md-raid0"); |
2604b703 | 794 | MODULE_ALIAS("md-level-0"); |