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 | |
394ed8e4 SL |
22 | #define UNSUPPORTED_MDDEV_FLAGS \ |
23 | ((1L << MD_HAS_JOURNAL) | \ | |
24 | (1L << MD_JOURNAL_CLEAN) | \ | |
ea0213e0 | 25 | (1L << MD_FAILFAST_SUPPORTED) |\ |
ddc08823 PB |
26 | (1L << MD_HAS_PPL) | \ |
27 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 28 | |
5c675f83 | 29 | static int raid0_congested(struct mddev *mddev, int bits) |
26be34dc | 30 | { |
e373ab10 | 31 | struct r0conf *conf = mddev->private; |
3cb03002 | 32 | struct md_rdev **devlist = conf->devlist; |
84707f38 | 33 | int raid_disks = conf->strip_zone[0].nb_dev; |
26be34dc N |
34 | int i, ret = 0; |
35 | ||
84707f38 | 36 | for (i = 0; i < raid_disks && !ret ; i++) { |
165125e1 | 37 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
26be34dc | 38 | |
dc3b17cc | 39 | ret |= bdi_congested(q->backing_dev_info, bits); |
26be34dc N |
40 | } |
41 | return ret; | |
42 | } | |
43 | ||
46994191 | 44 | /* |
45 | * inform the user of the raid configuration | |
46 | */ | |
fd01b88c | 47 | static void dump_zones(struct mddev *mddev) |
46994191 | 48 | { |
50de8df4 | 49 | int j, k; |
46994191 | 50 | sector_t zone_size = 0; |
51 | sector_t zone_start = 0; | |
52 | char b[BDEVNAME_SIZE]; | |
e373ab10 | 53 | struct r0conf *conf = mddev->private; |
84707f38 | 54 | int raid_disks = conf->strip_zone[0].nb_dev; |
76603884 N |
55 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
56 | mdname(mddev), | |
57 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); | |
46994191 | 58 | for (j = 0; j < conf->nr_strip_zones; j++) { |
76603884 N |
59 | char line[200]; |
60 | int len = 0; | |
61 | ||
46994191 | 62 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
76603884 N |
63 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
64 | bdevname(conf->devlist[j*raid_disks | |
65 | + k]->bdev, b)); | |
66 | pr_debug("md: zone%d=[%s]\n", j, line); | |
46994191 | 67 | |
68 | zone_size = conf->strip_zone[j].zone_end - zone_start; | |
76603884 | 69 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
46994191 | 70 | (unsigned long long)zone_start>>1, |
71 | (unsigned long long)conf->strip_zone[j].dev_start>>1, | |
72 | (unsigned long long)zone_size>>1); | |
73 | zone_start = conf->strip_zone[j].zone_end; | |
74 | } | |
46994191 | 75 | } |
76 | ||
e373ab10 | 77 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
1da177e4 | 78 | { |
a9f326eb | 79 | int i, c, err; |
49f357a2 | 80 | sector_t curr_zone_end, sectors; |
3cb03002 | 81 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
1da177e4 LT |
82 | struct strip_zone *zone; |
83 | int cnt; | |
84 | char b[BDEVNAME_SIZE]; | |
50de8df4 | 85 | char b2[BDEVNAME_SIZE]; |
e373ab10 | 86 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
199dc6ed | 87 | unsigned short blksize = 512; |
ed7b0038 | 88 | |
7dedd15d | 89 | *private_conf = ERR_PTR(-ENOMEM); |
ed7b0038 AN |
90 | if (!conf) |
91 | return -ENOMEM; | |
dafb20fa | 92 | rdev_for_each(rdev1, mddev) { |
50de8df4 N |
93 | pr_debug("md/raid0:%s: looking at %s\n", |
94 | mdname(mddev), | |
95 | bdevname(rdev1->bdev, b)); | |
1da177e4 | 96 | c = 0; |
13f2682b N |
97 | |
98 | /* round size to chunk_size */ | |
99 | sectors = rdev1->sectors; | |
100 | sector_div(sectors, mddev->chunk_sectors); | |
101 | rdev1->sectors = sectors * mddev->chunk_sectors; | |
102 | ||
199dc6ed N |
103 | blksize = max(blksize, queue_logical_block_size( |
104 | rdev1->bdev->bd_disk->queue)); | |
105 | ||
dafb20fa | 106 | rdev_for_each(rdev2, mddev) { |
50de8df4 N |
107 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
108 | " with %s(%llu)\n", | |
109 | mdname(mddev), | |
110 | bdevname(rdev1->bdev,b), | |
111 | (unsigned long long)rdev1->sectors, | |
112 | bdevname(rdev2->bdev,b2), | |
113 | (unsigned long long)rdev2->sectors); | |
1da177e4 | 114 | if (rdev2 == rdev1) { |
50de8df4 N |
115 | pr_debug("md/raid0:%s: END\n", |
116 | mdname(mddev)); | |
1da177e4 LT |
117 | break; |
118 | } | |
dd8ac336 | 119 | if (rdev2->sectors == rdev1->sectors) { |
1da177e4 LT |
120 | /* |
121 | * Not unique, don't count it as a new | |
122 | * group | |
123 | */ | |
50de8df4 N |
124 | pr_debug("md/raid0:%s: EQUAL\n", |
125 | mdname(mddev)); | |
1da177e4 LT |
126 | c = 1; |
127 | break; | |
128 | } | |
50de8df4 N |
129 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
130 | mdname(mddev)); | |
1da177e4 LT |
131 | } |
132 | if (!c) { | |
50de8df4 N |
133 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
134 | mdname(mddev)); | |
1da177e4 | 135 | conf->nr_strip_zones++; |
50de8df4 N |
136 | pr_debug("md/raid0:%s: %d zones\n", |
137 | mdname(mddev), conf->nr_strip_zones); | |
1da177e4 LT |
138 | } |
139 | } | |
50de8df4 N |
140 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
141 | mdname(mddev), conf->nr_strip_zones); | |
199dc6ed N |
142 | /* |
143 | * now since we have the hard sector sizes, we can make sure | |
144 | * chunk size is a multiple of that sector size | |
145 | */ | |
146 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
147 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
148 | mdname(mddev), | |
149 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
150 | err = -EINVAL; |
151 | goto abort; | |
152 | } | |
153 | ||
ed7b0038 | 154 | err = -ENOMEM; |
6396bb22 KC |
155 | conf->strip_zone = kcalloc(conf->nr_strip_zones, |
156 | sizeof(struct strip_zone), | |
157 | GFP_KERNEL); | |
1da177e4 | 158 | if (!conf->strip_zone) |
ed7b0038 | 159 | goto abort; |
6396bb22 KC |
160 | conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), |
161 | conf->nr_strip_zones, | |
162 | mddev->raid_disks), | |
1da177e4 LT |
163 | GFP_KERNEL); |
164 | if (!conf->devlist) | |
ed7b0038 | 165 | goto abort; |
1da177e4 | 166 | |
1da177e4 LT |
167 | /* The first zone must contain all devices, so here we check that |
168 | * there is a proper alignment of slots to devices and find them all | |
169 | */ | |
170 | zone = &conf->strip_zone[0]; | |
171 | cnt = 0; | |
172 | smallest = NULL; | |
b414579f | 173 | dev = conf->devlist; |
ed7b0038 | 174 | err = -EINVAL; |
dafb20fa | 175 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
176 | int j = rdev1->raid_disk; |
177 | ||
e93f68a1 | 178 | if (mddev->level == 10) { |
9af204cf TM |
179 | /* taking over a raid10-n2 array */ |
180 | j /= 2; | |
e93f68a1 N |
181 | rdev1->new_raid_disk = j; |
182 | } | |
9af204cf | 183 | |
fc3a08b8 KW |
184 | if (mddev->level == 1) { |
185 | /* taiking over a raid1 array- | |
186 | * we have only one active disk | |
187 | */ | |
188 | j = 0; | |
189 | rdev1->new_raid_disk = j; | |
190 | } | |
191 | ||
f96c9f30 | 192 | if (j < 0) { |
76603884 N |
193 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
194 | mdname(mddev)); | |
f96c9f30 N |
195 | goto abort; |
196 | } | |
197 | if (j >= mddev->raid_disks) { | |
76603884 N |
198 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
199 | mdname(mddev), j); | |
1da177e4 LT |
200 | goto abort; |
201 | } | |
b414579f | 202 | if (dev[j]) { |
76603884 N |
203 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
204 | mdname(mddev), j); | |
1da177e4 LT |
205 | goto abort; |
206 | } | |
b414579f | 207 | dev[j] = rdev1; |
1da177e4 | 208 | |
dd8ac336 | 209 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
210 | smallest = rdev1; |
211 | cnt++; | |
212 | } | |
213 | if (cnt != mddev->raid_disks) { | |
76603884 N |
214 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
215 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
216 | goto abort; |
217 | } | |
218 | zone->nb_dev = cnt; | |
49f357a2 | 219 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 220 | |
49f357a2 | 221 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
222 | |
223 | /* now do the other zones */ | |
224 | for (i = 1; i < conf->nr_strip_zones; i++) | |
225 | { | |
a9f326eb N |
226 | int j; |
227 | ||
1da177e4 | 228 | zone = conf->strip_zone + i; |
b414579f | 229 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 230 | |
50de8df4 | 231 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 232 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
233 | smallest = NULL; |
234 | c = 0; | |
235 | ||
236 | for (j=0; j<cnt; j++) { | |
b414579f | 237 | rdev = conf->devlist[j]; |
d27a43ab | 238 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
239 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
240 | mdname(mddev), | |
241 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
242 | continue; |
243 | } | |
50de8df4 N |
244 | pr_debug("md/raid0:%s: checking %s ..." |
245 | " contained as device %d\n", | |
246 | mdname(mddev), | |
247 | bdevname(rdev->bdev, b), c); | |
b414579f | 248 | dev[c] = rdev; |
dd8ac336 AN |
249 | c++; |
250 | if (!smallest || rdev->sectors < smallest->sectors) { | |
251 | smallest = rdev; | |
50de8df4 N |
252 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
253 | mdname(mddev), | |
254 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 255 | } |
1da177e4 LT |
256 | } |
257 | ||
258 | zone->nb_dev = c; | |
49f357a2 | 259 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
260 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
261 | mdname(mddev), | |
262 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 263 | |
49f357a2 | 264 | curr_zone_end += sectors; |
d27a43ab | 265 | zone->zone_end = curr_zone_end; |
1da177e4 | 266 | |
50de8df4 N |
267 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
268 | mdname(mddev), | |
269 | (unsigned long long)smallest->sectors); | |
1da177e4 | 270 | } |
1da177e4 | 271 | |
50de8df4 | 272 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
9af204cf TM |
273 | *private_conf = conf; |
274 | ||
1da177e4 | 275 | return 0; |
5568a603 | 276 | abort: |
ed7b0038 AN |
277 | kfree(conf->strip_zone); |
278 | kfree(conf->devlist); | |
279 | kfree(conf); | |
58ebb34c | 280 | *private_conf = ERR_PTR(err); |
ed7b0038 | 281 | return err; |
1da177e4 LT |
282 | } |
283 | ||
ba13da47 N |
284 | /* Find the zone which holds a particular offset |
285 | * Update *sectorp to be an offset in that zone | |
286 | */ | |
287 | static struct strip_zone *find_zone(struct r0conf *conf, | |
288 | sector_t *sectorp) | |
289 | { | |
290 | int i; | |
291 | struct strip_zone *z = conf->strip_zone; | |
292 | sector_t sector = *sectorp; | |
293 | ||
294 | for (i = 0; i < conf->nr_strip_zones; i++) | |
295 | if (sector < z[i].zone_end) { | |
296 | if (i) | |
297 | *sectorp = sector - z[i-1].zone_end; | |
298 | return z + i; | |
299 | } | |
300 | BUG(); | |
301 | } | |
302 | ||
303 | /* | |
304 | * remaps the bio to the target device. we separate two flows. | |
47d68979 | 305 | * power 2 flow and a general flow for the sake of performance |
ba13da47 N |
306 | */ |
307 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, | |
308 | sector_t sector, sector_t *sector_offset) | |
309 | { | |
310 | unsigned int sect_in_chunk; | |
311 | sector_t chunk; | |
312 | struct r0conf *conf = mddev->private; | |
313 | int raid_disks = conf->strip_zone[0].nb_dev; | |
314 | unsigned int chunk_sects = mddev->chunk_sectors; | |
315 | ||
316 | if (is_power_of_2(chunk_sects)) { | |
317 | int chunksect_bits = ffz(~chunk_sects); | |
318 | /* find the sector offset inside the chunk */ | |
319 | sect_in_chunk = sector & (chunk_sects - 1); | |
320 | sector >>= chunksect_bits; | |
321 | /* chunk in zone */ | |
322 | chunk = *sector_offset; | |
323 | /* quotient is the chunk in real device*/ | |
324 | sector_div(chunk, zone->nb_dev << chunksect_bits); | |
325 | } else{ | |
326 | sect_in_chunk = sector_div(sector, chunk_sects); | |
327 | chunk = *sector_offset; | |
328 | sector_div(chunk, chunk_sects * zone->nb_dev); | |
329 | } | |
330 | /* | |
331 | * position the bio over the real device | |
332 | * real sector = chunk in device + starting of zone | |
333 | * + the position in the chunk | |
334 | */ | |
335 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; | |
336 | return conf->devlist[(zone - conf->strip_zone)*raid_disks | |
337 | + sector_div(sector, zone->nb_dev)]; | |
338 | } | |
339 | ||
fd01b88c | 340 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
341 | { |
342 | sector_t array_sectors = 0; | |
3cb03002 | 343 | struct md_rdev *rdev; |
80c3a6ce DW |
344 | |
345 | WARN_ONCE(sectors || raid_disks, | |
346 | "%s does not support generic reshape\n", __func__); | |
347 | ||
dafb20fa | 348 | rdev_for_each(rdev, mddev) |
a6468539 N |
349 | array_sectors += (rdev->sectors & |
350 | ~(sector_t)(mddev->chunk_sectors-1)); | |
80c3a6ce DW |
351 | |
352 | return array_sectors; | |
353 | } | |
354 | ||
afa0f557 | 355 | static void raid0_free(struct mddev *mddev, void *priv); |
0366ef84 | 356 | |
fd01b88c | 357 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 358 | { |
e373ab10 | 359 | struct r0conf *conf; |
5568a603 | 360 | int ret; |
1da177e4 | 361 | |
9d8f0363 | 362 | if (mddev->chunk_sectors == 0) { |
76603884 | 363 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
364 | return -EINVAL; |
365 | } | |
0894cc30 AN |
366 | if (md_check_no_bitmap(mddev)) |
367 | return -EINVAL; | |
753f2856 | 368 | |
9af204cf TM |
369 | /* if private is not null, we are here after takeover */ |
370 | if (mddev->private == NULL) { | |
371 | ret = create_strip_zones(mddev, &conf); | |
372 | if (ret < 0) | |
373 | return ret; | |
374 | mddev->private = conf; | |
375 | } | |
376 | conf = mddev->private; | |
199dc6ed N |
377 | if (mddev->queue) { |
378 | struct md_rdev *rdev; | |
379 | bool discard_supported = false; | |
380 | ||
199dc6ed N |
381 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
382 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 383 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 384 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
385 | |
386 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
387 | blk_queue_io_opt(mddev->queue, | |
388 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
389 | ||
66eefe5d N |
390 | rdev_for_each(rdev, mddev) { |
391 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
392 | rdev->data_offset << 9); | |
393 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
394 | discard_supported = true; | |
395 | } | |
199dc6ed | 396 | if (!discard_supported) |
8b904b5b | 397 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 398 | else |
8b904b5b | 399 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 400 | } |
1da177e4 LT |
401 | |
402 | /* calculate array device size */ | |
1f403624 | 403 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 404 | |
76603884 N |
405 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
406 | mdname(mddev), | |
407 | (unsigned long long)mddev->array_sectors); | |
753f2856 HM |
408 | |
409 | if (mddev->queue) { | |
410 | /* calculate the max read-ahead size. | |
411 | * For read-ahead of large files to be effective, we need to | |
412 | * readahead at least twice a whole stripe. i.e. number of devices | |
413 | * multiplied by chunk size times 2. | |
414 | * If an individual device has an ra_pages greater than the | |
415 | * chunk size, then we will not drive that device as hard as it | |
416 | * wants. We consider this a configuration error: a larger | |
417 | * chunksize should be used in that case. | |
418 | */ | |
9d8f0363 AN |
419 | int stripe = mddev->raid_disks * |
420 | (mddev->chunk_sectors << 9) / PAGE_SIZE; | |
dc3b17cc JK |
421 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
422 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; | |
1da177e4 LT |
423 | } |
424 | ||
46994191 | 425 | dump_zones(mddev); |
0366ef84 | 426 | |
427 | ret = md_integrity_register(mddev); | |
0366ef84 | 428 | |
429 | return ret; | |
1da177e4 LT |
430 | } |
431 | ||
afa0f557 | 432 | static void raid0_free(struct mddev *mddev, void *priv) |
1da177e4 | 433 | { |
afa0f557 | 434 | struct r0conf *conf = priv; |
1da177e4 | 435 | |
990a8baf | 436 | kfree(conf->strip_zone); |
fb5ab4b5 | 437 | kfree(conf->devlist); |
990a8baf | 438 | kfree(conf); |
1da177e4 LT |
439 | } |
440 | ||
fbb704ef | 441 | /* |
442 | * Is io distribute over 1 or more chunks ? | |
443 | */ | |
fd01b88c | 444 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
fbb704ef | 445 | unsigned int chunk_sects, struct bio *bio) |
446 | { | |
d6e412ea | 447 | if (likely(is_power_of_2(chunk_sects))) { |
4f024f37 KO |
448 | return chunk_sects >= |
449 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) | |
aa8b57aa | 450 | + bio_sectors(bio)); |
fbb704ef | 451 | } else{ |
4f024f37 | 452 | sector_t sector = bio->bi_iter.bi_sector; |
fbb704ef | 453 | return chunk_sects >= (sector_div(sector, chunk_sects) |
aa8b57aa | 454 | + bio_sectors(bio)); |
fbb704ef | 455 | } |
456 | } | |
457 | ||
29efc390 SL |
458 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
459 | { | |
460 | struct r0conf *conf = mddev->private; | |
461 | struct strip_zone *zone; | |
462 | sector_t start = bio->bi_iter.bi_sector; | |
463 | sector_t end; | |
464 | unsigned int stripe_size; | |
465 | sector_t first_stripe_index, last_stripe_index; | |
466 | sector_t start_disk_offset; | |
467 | unsigned int start_disk_index; | |
468 | sector_t end_disk_offset; | |
469 | unsigned int end_disk_index; | |
470 | unsigned int disk; | |
471 | ||
472 | zone = find_zone(conf, &start); | |
473 | ||
474 | if (bio_end_sector(bio) > zone->zone_end) { | |
475 | struct bio *split = bio_split(bio, | |
476 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
afeee514 | 477 | &mddev->bio_set); |
29efc390 SL |
478 | bio_chain(split, bio); |
479 | generic_make_request(bio); | |
480 | bio = split; | |
481 | end = zone->zone_end; | |
482 | } else | |
483 | end = bio_end_sector(bio); | |
484 | ||
485 | if (zone != conf->strip_zone) | |
486 | end = end - zone[-1].zone_end; | |
487 | ||
488 | /* Now start and end is the offset in zone */ | |
489 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
490 | ||
491 | first_stripe_index = start; | |
492 | sector_div(first_stripe_index, stripe_size); | |
493 | last_stripe_index = end; | |
494 | sector_div(last_stripe_index, stripe_size); | |
495 | ||
496 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
497 | mddev->chunk_sectors; | |
498 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
499 | mddev->chunk_sectors) + | |
500 | first_stripe_index * mddev->chunk_sectors; | |
501 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
502 | mddev->chunk_sectors; | |
503 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
504 | mddev->chunk_sectors) + | |
505 | last_stripe_index * mddev->chunk_sectors; | |
506 | ||
507 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
508 | sector_t dev_start, dev_end; | |
509 | struct bio *discard_bio = NULL; | |
510 | struct md_rdev *rdev; | |
511 | ||
512 | if (disk < start_disk_index) | |
513 | dev_start = (first_stripe_index + 1) * | |
514 | mddev->chunk_sectors; | |
515 | else if (disk > start_disk_index) | |
516 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
517 | else | |
518 | dev_start = start_disk_offset; | |
519 | ||
520 | if (disk < end_disk_index) | |
521 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
522 | else if (disk > end_disk_index) | |
523 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
524 | else | |
525 | dev_end = end_disk_offset; | |
526 | ||
527 | if (dev_end <= dev_start) | |
528 | continue; | |
529 | ||
530 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
531 | conf->strip_zone[0].nb_dev + disk]; | |
532 | if (__blkdev_issue_discard(rdev->bdev, | |
533 | dev_start + zone->dev_start + rdev->data_offset, | |
534 | dev_end - dev_start, GFP_NOIO, 0, &discard_bio) || | |
535 | !discard_bio) | |
536 | continue; | |
537 | bio_chain(discard_bio, bio); | |
db6638d7 | 538 | bio_clone_blkg_association(discard_bio, bio); |
29efc390 SL |
539 | if (mddev->gendisk) |
540 | trace_block_bio_remap(bdev_get_queue(rdev->bdev), | |
541 | discard_bio, disk_devt(mddev->gendisk), | |
542 | bio->bi_iter.bi_sector); | |
543 | generic_make_request(discard_bio); | |
544 | } | |
545 | bio_endio(bio); | |
546 | } | |
547 | ||
cc27b0c7 | 548 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 549 | { |
1da177e4 | 550 | struct strip_zone *zone; |
3cb03002 | 551 | struct md_rdev *tmp_dev; |
f00d7c85 N |
552 | sector_t bio_sector; |
553 | sector_t sector; | |
554 | unsigned chunk_sects; | |
555 | unsigned sectors; | |
1da177e4 | 556 | |
1eff9d32 | 557 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
e9c7469b | 558 | md_flush_request(mddev, bio); |
cc27b0c7 | 559 | return true; |
e5dcdd80 N |
560 | } |
561 | ||
29efc390 SL |
562 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
563 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 564 | return true; |
29efc390 SL |
565 | } |
566 | ||
f00d7c85 N |
567 | bio_sector = bio->bi_iter.bi_sector; |
568 | sector = bio_sector; | |
569 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 570 | |
f00d7c85 N |
571 | sectors = chunk_sects - |
572 | (likely(is_power_of_2(chunk_sects)) | |
573 | ? (sector & (chunk_sects-1)) | |
574 | : sector_div(sector, chunk_sects)); | |
20d0189b | 575 | |
f00d7c85 N |
576 | /* Restore due to sector_div */ |
577 | sector = bio_sector; | |
a8115776 | 578 | |
f00d7c85 | 579 | if (sectors < bio_sectors(bio)) { |
afeee514 KO |
580 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, |
581 | &mddev->bio_set); | |
f00d7c85 N |
582 | bio_chain(split, bio); |
583 | generic_make_request(bio); | |
584 | bio = split; | |
585 | } | |
1da177e4 | 586 | |
f00d7c85 N |
587 | zone = find_zone(mddev->private, §or); |
588 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
74d46992 | 589 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
590 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
591 | tmp_dev->data_offset; | |
592 | ||
29efc390 | 593 | if (mddev->gendisk) |
74d46992 CH |
594 | trace_block_bio_remap(bio->bi_disk->queue, bio, |
595 | disk_devt(mddev->gendisk), bio_sector); | |
29efc390 SL |
596 | mddev_check_writesame(mddev, bio); |
597 | mddev_check_write_zeroes(mddev, bio); | |
598 | generic_make_request(bio); | |
cc27b0c7 | 599 | return true; |
1da177e4 | 600 | } |
8299d7f7 | 601 | |
fd01b88c | 602 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 603 | { |
9d8f0363 | 604 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
605 | return; |
606 | } | |
607 | ||
fd01b88c | 608 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 609 | { |
3cb03002 | 610 | struct md_rdev *rdev; |
e373ab10 | 611 | struct r0conf *priv_conf; |
9af204cf TM |
612 | |
613 | if (mddev->degraded != 1) { | |
76603884 N |
614 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
615 | mdname(mddev), | |
616 | mddev->degraded); | |
9af204cf TM |
617 | return ERR_PTR(-EINVAL); |
618 | } | |
619 | ||
dafb20fa | 620 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
621 | /* check slot number for a disk */ |
622 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
623 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
624 | mdname(mddev)); | |
9af204cf TM |
625 | return ERR_PTR(-EINVAL); |
626 | } | |
eea136d6 | 627 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
628 | } |
629 | ||
630 | /* Set new parameters */ | |
631 | mddev->new_level = 0; | |
001048a3 | 632 | mddev->new_layout = 0; |
9af204cf TM |
633 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
634 | mddev->raid_disks--; | |
635 | mddev->delta_disks = -1; | |
636 | /* make sure it will be not marked as dirty */ | |
637 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 638 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
639 | |
640 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 641 | |
9af204cf TM |
642 | return priv_conf; |
643 | } | |
644 | ||
fd01b88c | 645 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 646 | { |
e373ab10 | 647 | struct r0conf *priv_conf; |
9af204cf TM |
648 | |
649 | /* Check layout: | |
650 | * - far_copies must be 1 | |
651 | * - near_copies must be 2 | |
652 | * - disks number must be even | |
653 | * - all mirrors must be already degraded | |
654 | */ | |
655 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
656 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
657 | mdname(mddev), | |
658 | mddev->layout); | |
9af204cf TM |
659 | return ERR_PTR(-EINVAL); |
660 | } | |
661 | if (mddev->raid_disks & 1) { | |
76603884 N |
662 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
663 | mdname(mddev)); | |
9af204cf TM |
664 | return ERR_PTR(-EINVAL); |
665 | } | |
666 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
667 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
668 | mdname(mddev)); | |
9af204cf TM |
669 | return ERR_PTR(-EINVAL); |
670 | } | |
671 | ||
672 | /* Set new parameters */ | |
673 | mddev->new_level = 0; | |
001048a3 | 674 | mddev->new_layout = 0; |
9af204cf TM |
675 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
676 | mddev->delta_disks = - mddev->raid_disks / 2; | |
677 | mddev->raid_disks += mddev->delta_disks; | |
678 | mddev->degraded = 0; | |
679 | /* make sure it will be not marked as dirty */ | |
680 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 681 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
682 | |
683 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
684 | return priv_conf; |
685 | } | |
686 | ||
fd01b88c | 687 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 688 | { |
e373ab10 | 689 | struct r0conf *priv_conf; |
24b961f8 | 690 | int chunksect; |
fc3a08b8 KW |
691 | |
692 | /* Check layout: | |
693 | * - (N - 1) mirror drives must be already faulty | |
694 | */ | |
695 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 696 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
697 | mdname(mddev)); |
698 | return ERR_PTR(-EINVAL); | |
699 | } | |
700 | ||
24b961f8 JS |
701 | /* |
702 | * a raid1 doesn't have the notion of chunk size, so | |
703 | * figure out the largest suitable size we can use. | |
704 | */ | |
705 | chunksect = 64 * 2; /* 64K by default */ | |
706 | ||
707 | /* The array must be an exact multiple of chunksize */ | |
708 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
709 | chunksect >>= 1; | |
710 | ||
711 | if ((chunksect << 9) < PAGE_SIZE) | |
712 | /* array size does not allow a suitable chunk size */ | |
713 | return ERR_PTR(-EINVAL); | |
714 | ||
fc3a08b8 KW |
715 | /* Set new parameters */ |
716 | mddev->new_level = 0; | |
717 | mddev->new_layout = 0; | |
24b961f8 JS |
718 | mddev->new_chunk_sectors = chunksect; |
719 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 720 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 721 | mddev->raid_disks = 1; |
fc3a08b8 KW |
722 | /* make sure it will be not marked as dirty */ |
723 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 724 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
725 | |
726 | create_strip_zones(mddev, &priv_conf); | |
727 | return priv_conf; | |
728 | } | |
729 | ||
fd01b88c | 730 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
731 | { |
732 | /* raid0 can take over: | |
049d6c1e | 733 | * raid4 - if all data disks are active. |
9af204cf TM |
734 | * raid5 - providing it is Raid4 layout and one disk is faulty |
735 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 736 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 737 | */ |
a8461a61 N |
738 | |
739 | if (mddev->bitmap) { | |
76603884 N |
740 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
741 | mdname(mddev)); | |
a8461a61 N |
742 | return ERR_PTR(-EBUSY); |
743 | } | |
049d6c1e MT |
744 | if (mddev->level == 4) |
745 | return raid0_takeover_raid45(mddev); | |
746 | ||
9af204cf TM |
747 | if (mddev->level == 5) { |
748 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 749 | return raid0_takeover_raid45(mddev); |
9af204cf | 750 | |
76603884 N |
751 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
752 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
753 | } |
754 | ||
755 | if (mddev->level == 10) | |
756 | return raid0_takeover_raid10(mddev); | |
757 | ||
fc3a08b8 KW |
758 | if (mddev->level == 1) |
759 | return raid0_takeover_raid1(mddev); | |
760 | ||
76603884 | 761 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
762 | mddev->level); |
763 | ||
9af204cf TM |
764 | return ERR_PTR(-EINVAL); |
765 | } | |
766 | ||
b03e0ccb | 767 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
768 | { |
769 | } | |
770 | ||
84fc4b56 | 771 | static struct md_personality raid0_personality= |
1da177e4 LT |
772 | { |
773 | .name = "raid0", | |
2604b703 | 774 | .level = 0, |
1da177e4 LT |
775 | .owner = THIS_MODULE, |
776 | .make_request = raid0_make_request, | |
777 | .run = raid0_run, | |
afa0f557 | 778 | .free = raid0_free, |
1da177e4 | 779 | .status = raid0_status, |
80c3a6ce | 780 | .size = raid0_size, |
9af204cf TM |
781 | .takeover = raid0_takeover, |
782 | .quiesce = raid0_quiesce, | |
5c675f83 | 783 | .congested = raid0_congested, |
1da177e4 LT |
784 | }; |
785 | ||
786 | static int __init raid0_init (void) | |
787 | { | |
2604b703 | 788 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
789 | } |
790 | ||
791 | static void raid0_exit (void) | |
792 | { | |
2604b703 | 793 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
794 | } |
795 | ||
796 | module_init(raid0_init); | |
797 | module_exit(raid0_exit); | |
798 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 799 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 800 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 801 | MODULE_ALIAS("md-raid0"); |
2604b703 | 802 | MODULE_ALIAS("md-level-0"); |