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Commit | Line | Data |
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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 N |
130 | |
131 | if (conf->nr_strip_zones == 1) { | |
132 | conf->layout = RAID0_ORIG_LAYOUT; | |
33f2c35a N |
133 | } else if (mddev->layout == RAID0_ORIG_LAYOUT || |
134 | mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
135 | conf->layout = mddev->layout; | |
c84a1372 N |
136 | } else if (default_layout == RAID0_ORIG_LAYOUT || |
137 | default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
138 | conf->layout = default_layout; | |
139 | } else { | |
880841a5 SB |
140 | conf->layout = RAID0_ALT_MULTIZONE_LAYOUT; |
141 | pr_warn("md/raid0:%s: !!! DEFAULTING TO ALTERNATE LAYOUT !!!\n", | |
c84a1372 | 142 | mdname(mddev)); |
880841a5 SB |
143 | pr_warn("md/raid0: Please set raid0.default_layout to 1 or 2\n"); |
144 | pr_warn("md/raid0: Read the following page for more information:\n"); | |
145 | pr_warn("md/raid0: https://wiki.ubuntu.com/Kernel/Raid0LayoutMigration\n"); | |
c84a1372 | 146 | } |
199dc6ed N |
147 | /* |
148 | * now since we have the hard sector sizes, we can make sure | |
149 | * chunk size is a multiple of that sector size | |
150 | */ | |
151 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
152 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
153 | mdname(mddev), | |
154 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
155 | err = -EINVAL; |
156 | goto abort; | |
157 | } | |
158 | ||
ed7b0038 | 159 | err = -ENOMEM; |
6396bb22 KC |
160 | conf->strip_zone = kcalloc(conf->nr_strip_zones, |
161 | sizeof(struct strip_zone), | |
162 | GFP_KERNEL); | |
1da177e4 | 163 | if (!conf->strip_zone) |
ed7b0038 | 164 | goto abort; |
6396bb22 KC |
165 | conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), |
166 | conf->nr_strip_zones, | |
167 | mddev->raid_disks), | |
1da177e4 LT |
168 | GFP_KERNEL); |
169 | if (!conf->devlist) | |
ed7b0038 | 170 | goto abort; |
1da177e4 | 171 | |
1da177e4 LT |
172 | /* The first zone must contain all devices, so here we check that |
173 | * there is a proper alignment of slots to devices and find them all | |
174 | */ | |
175 | zone = &conf->strip_zone[0]; | |
176 | cnt = 0; | |
177 | smallest = NULL; | |
b414579f | 178 | dev = conf->devlist; |
ed7b0038 | 179 | err = -EINVAL; |
dafb20fa | 180 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
181 | int j = rdev1->raid_disk; |
182 | ||
e93f68a1 | 183 | if (mddev->level == 10) { |
9af204cf TM |
184 | /* taking over a raid10-n2 array */ |
185 | j /= 2; | |
e93f68a1 N |
186 | rdev1->new_raid_disk = j; |
187 | } | |
9af204cf | 188 | |
fc3a08b8 KW |
189 | if (mddev->level == 1) { |
190 | /* taiking over a raid1 array- | |
191 | * we have only one active disk | |
192 | */ | |
193 | j = 0; | |
194 | rdev1->new_raid_disk = j; | |
195 | } | |
196 | ||
f96c9f30 | 197 | if (j < 0) { |
76603884 N |
198 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
199 | mdname(mddev)); | |
f96c9f30 N |
200 | goto abort; |
201 | } | |
202 | if (j >= mddev->raid_disks) { | |
76603884 N |
203 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
204 | mdname(mddev), j); | |
1da177e4 LT |
205 | goto abort; |
206 | } | |
b414579f | 207 | if (dev[j]) { |
76603884 N |
208 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
209 | mdname(mddev), j); | |
1da177e4 LT |
210 | goto abort; |
211 | } | |
b414579f | 212 | dev[j] = rdev1; |
1da177e4 | 213 | |
dd8ac336 | 214 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
215 | smallest = rdev1; |
216 | cnt++; | |
217 | } | |
218 | if (cnt != mddev->raid_disks) { | |
76603884 N |
219 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
220 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
221 | goto abort; |
222 | } | |
223 | zone->nb_dev = cnt; | |
49f357a2 | 224 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 225 | |
49f357a2 | 226 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
227 | |
228 | /* now do the other zones */ | |
229 | for (i = 1; i < conf->nr_strip_zones; i++) | |
230 | { | |
a9f326eb N |
231 | int j; |
232 | ||
1da177e4 | 233 | zone = conf->strip_zone + i; |
b414579f | 234 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 235 | |
50de8df4 | 236 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 237 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
238 | smallest = NULL; |
239 | c = 0; | |
240 | ||
241 | for (j=0; j<cnt; j++) { | |
b414579f | 242 | rdev = conf->devlist[j]; |
d27a43ab | 243 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
244 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
245 | mdname(mddev), | |
246 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
247 | continue; |
248 | } | |
50de8df4 N |
249 | pr_debug("md/raid0:%s: checking %s ..." |
250 | " contained as device %d\n", | |
251 | mdname(mddev), | |
252 | bdevname(rdev->bdev, b), c); | |
b414579f | 253 | dev[c] = rdev; |
dd8ac336 AN |
254 | c++; |
255 | if (!smallest || rdev->sectors < smallest->sectors) { | |
256 | smallest = rdev; | |
50de8df4 N |
257 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
258 | mdname(mddev), | |
259 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 260 | } |
1da177e4 LT |
261 | } |
262 | ||
263 | zone->nb_dev = c; | |
49f357a2 | 264 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
265 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
266 | mdname(mddev), | |
267 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 268 | |
49f357a2 | 269 | curr_zone_end += sectors; |
d27a43ab | 270 | zone->zone_end = curr_zone_end; |
1da177e4 | 271 | |
50de8df4 N |
272 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
273 | mdname(mddev), | |
274 | (unsigned long long)smallest->sectors); | |
1da177e4 | 275 | } |
1da177e4 | 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 | ||
306d8015 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); | |
306d8015 XN |
365 | } |
366 | ||
367 | static void raid0_free(struct mddev *mddev, void *priv) | |
368 | { | |
369 | struct r0conf *conf = priv; | |
370 | ||
371 | free_conf(mddev, conf); | |
372 | acct_bioset_exit(mddev); | |
373 | } | |
0366ef84 | 374 | |
fd01b88c | 375 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 376 | { |
e373ab10 | 377 | struct r0conf *conf; |
5568a603 | 378 | int ret; |
1da177e4 | 379 | |
9d8f0363 | 380 | if (mddev->chunk_sectors == 0) { |
76603884 | 381 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
382 | return -EINVAL; |
383 | } | |
0894cc30 AN |
384 | if (md_check_no_bitmap(mddev)) |
385 | return -EINVAL; | |
753f2856 | 386 | |
306d8015 XN |
387 | if (acct_bioset_init(mddev)) { |
388 | pr_err("md/raid0:%s: alloc acct bioset failed.\n", mdname(mddev)); | |
389 | return -ENOMEM; | |
390 | } | |
391 | ||
9af204cf TM |
392 | /* if private is not null, we are here after takeover */ |
393 | if (mddev->private == NULL) { | |
394 | ret = create_strip_zones(mddev, &conf); | |
395 | if (ret < 0) | |
306d8015 | 396 | goto exit_acct_set; |
9af204cf TM |
397 | mddev->private = conf; |
398 | } | |
399 | conf = mddev->private; | |
199dc6ed N |
400 | if (mddev->queue) { |
401 | struct md_rdev *rdev; | |
402 | bool discard_supported = false; | |
403 | ||
199dc6ed N |
404 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
405 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 406 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 407 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
408 | |
409 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
410 | blk_queue_io_opt(mddev->queue, | |
411 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
412 | ||
66eefe5d N |
413 | rdev_for_each(rdev, mddev) { |
414 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
415 | rdev->data_offset << 9); | |
416 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
417 | discard_supported = true; | |
418 | } | |
199dc6ed | 419 | if (!discard_supported) |
8b904b5b | 420 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 421 | else |
8b904b5b | 422 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 423 | } |
1da177e4 LT |
424 | |
425 | /* calculate array device size */ | |
1f403624 | 426 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 427 | |
76603884 N |
428 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
429 | mdname(mddev), | |
430 | (unsigned long long)mddev->array_sectors); | |
753f2856 | 431 | |
46994191 | 432 | dump_zones(mddev); |
0366ef84 | 433 | |
434 | ret = md_integrity_register(mddev); | |
306d8015 XN |
435 | if (ret) |
436 | goto free; | |
0366ef84 | 437 | |
438 | return ret; | |
1da177e4 | 439 | |
306d8015 XN |
440 | free: |
441 | free_conf(mddev, conf); | |
442 | exit_acct_set: | |
443 | acct_bioset_exit(mddev); | |
444 | return ret; | |
1da177e4 LT |
445 | } |
446 | ||
29efc390 SL |
447 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
448 | { | |
449 | struct r0conf *conf = mddev->private; | |
450 | struct strip_zone *zone; | |
451 | sector_t start = bio->bi_iter.bi_sector; | |
452 | sector_t end; | |
453 | unsigned int stripe_size; | |
454 | sector_t first_stripe_index, last_stripe_index; | |
455 | sector_t start_disk_offset; | |
456 | unsigned int start_disk_index; | |
457 | sector_t end_disk_offset; | |
458 | unsigned int end_disk_index; | |
459 | unsigned int disk; | |
460 | ||
461 | zone = find_zone(conf, &start); | |
462 | ||
463 | if (bio_end_sector(bio) > zone->zone_end) { | |
464 | struct bio *split = bio_split(bio, | |
465 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
afeee514 | 466 | &mddev->bio_set); |
29efc390 | 467 | bio_chain(split, bio); |
ed00aabd | 468 | submit_bio_noacct(bio); |
29efc390 SL |
469 | bio = split; |
470 | end = zone->zone_end; | |
471 | } else | |
472 | end = bio_end_sector(bio); | |
473 | ||
474 | if (zone != conf->strip_zone) | |
475 | end = end - zone[-1].zone_end; | |
476 | ||
477 | /* Now start and end is the offset in zone */ | |
478 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
479 | ||
480 | first_stripe_index = start; | |
481 | sector_div(first_stripe_index, stripe_size); | |
482 | last_stripe_index = end; | |
483 | sector_div(last_stripe_index, stripe_size); | |
484 | ||
485 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
486 | mddev->chunk_sectors; | |
487 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
488 | mddev->chunk_sectors) + | |
489 | first_stripe_index * mddev->chunk_sectors; | |
490 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
491 | mddev->chunk_sectors; | |
492 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
493 | mddev->chunk_sectors) + | |
494 | last_stripe_index * mddev->chunk_sectors; | |
495 | ||
496 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
497 | sector_t dev_start, dev_end; | |
29efc390 SL |
498 | struct md_rdev *rdev; |
499 | ||
500 | if (disk < start_disk_index) | |
501 | dev_start = (first_stripe_index + 1) * | |
502 | mddev->chunk_sectors; | |
503 | else if (disk > start_disk_index) | |
504 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
505 | else | |
506 | dev_start = start_disk_offset; | |
507 | ||
508 | if (disk < end_disk_index) | |
509 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
510 | else if (disk > end_disk_index) | |
511 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
512 | else | |
513 | dev_end = end_disk_offset; | |
514 | ||
515 | if (dev_end <= dev_start) | |
516 | continue; | |
517 | ||
518 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
519 | conf->strip_zone[0].nb_dev + disk]; | |
cf78408f | 520 | md_submit_discard_bio(mddev, rdev, bio, |
29efc390 | 521 | dev_start + zone->dev_start + rdev->data_offset, |
cf78408f | 522 | dev_end - dev_start); |
29efc390 SL |
523 | } |
524 | bio_endio(bio); | |
525 | } | |
526 | ||
cc27b0c7 | 527 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 528 | { |
c84a1372 | 529 | struct r0conf *conf = mddev->private; |
1da177e4 | 530 | struct strip_zone *zone; |
3cb03002 | 531 | struct md_rdev *tmp_dev; |
f00d7c85 N |
532 | sector_t bio_sector; |
533 | sector_t sector; | |
c84a1372 | 534 | sector_t orig_sector; |
f00d7c85 N |
535 | unsigned chunk_sects; |
536 | unsigned sectors; | |
1da177e4 | 537 | |
775d7831 DJ |
538 | if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
539 | && md_flush_request(mddev, bio)) | |
cc27b0c7 | 540 | return true; |
e5dcdd80 | 541 | |
29efc390 SL |
542 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
543 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 544 | return true; |
29efc390 SL |
545 | } |
546 | ||
f00d7c85 N |
547 | bio_sector = bio->bi_iter.bi_sector; |
548 | sector = bio_sector; | |
549 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 550 | |
f00d7c85 N |
551 | sectors = chunk_sects - |
552 | (likely(is_power_of_2(chunk_sects)) | |
553 | ? (sector & (chunk_sects-1)) | |
554 | : sector_div(sector, chunk_sects)); | |
20d0189b | 555 | |
f00d7c85 N |
556 | /* Restore due to sector_div */ |
557 | sector = bio_sector; | |
a8115776 | 558 | |
f00d7c85 | 559 | if (sectors < bio_sectors(bio)) { |
afeee514 KO |
560 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, |
561 | &mddev->bio_set); | |
f00d7c85 | 562 | bio_chain(split, bio); |
ed00aabd | 563 | submit_bio_noacct(bio); |
f00d7c85 N |
564 | bio = split; |
565 | } | |
1da177e4 | 566 | |
10764815 GJ |
567 | if (bio->bi_pool != &mddev->bio_set) |
568 | md_account_bio(mddev, &bio); | |
569 | ||
c84a1372 | 570 | orig_sector = sector; |
f00d7c85 | 571 | zone = find_zone(mddev->private, §or); |
c84a1372 N |
572 | switch (conf->layout) { |
573 | case RAID0_ORIG_LAYOUT: | |
574 | tmp_dev = map_sector(mddev, zone, orig_sector, §or); | |
575 | break; | |
576 | case RAID0_ALT_MULTIZONE_LAYOUT: | |
577 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
578 | break; | |
579 | default: | |
e3fc3f3d | 580 | WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); |
c84a1372 N |
581 | bio_io_error(bio); |
582 | return true; | |
583 | } | |
62f7b198 GP |
584 | |
585 | if (unlikely(is_mddev_broken(tmp_dev, "raid0"))) { | |
586 | bio_io_error(bio); | |
587 | return true; | |
588 | } | |
589 | ||
74d46992 | 590 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
591 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
592 | tmp_dev->data_offset; | |
593 | ||
29efc390 | 594 | if (mddev->gendisk) |
1c02fca6 CH |
595 | trace_block_bio_remap(bio, disk_devt(mddev->gendisk), |
596 | bio_sector); | |
29efc390 SL |
597 | mddev_check_writesame(mddev, bio); |
598 | mddev_check_write_zeroes(mddev, bio); | |
ed00aabd | 599 | submit_bio_noacct(bio); |
cc27b0c7 | 600 | return true; |
1da177e4 | 601 | } |
8299d7f7 | 602 | |
fd01b88c | 603 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 604 | { |
9d8f0363 | 605 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
606 | return; |
607 | } | |
608 | ||
fd01b88c | 609 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 610 | { |
3cb03002 | 611 | struct md_rdev *rdev; |
e373ab10 | 612 | struct r0conf *priv_conf; |
9af204cf TM |
613 | |
614 | if (mddev->degraded != 1) { | |
76603884 N |
615 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
616 | mdname(mddev), | |
617 | mddev->degraded); | |
9af204cf TM |
618 | return ERR_PTR(-EINVAL); |
619 | } | |
620 | ||
dafb20fa | 621 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
622 | /* check slot number for a disk */ |
623 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
624 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
625 | mdname(mddev)); | |
9af204cf TM |
626 | return ERR_PTR(-EINVAL); |
627 | } | |
eea136d6 | 628 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
629 | } |
630 | ||
631 | /* Set new parameters */ | |
632 | mddev->new_level = 0; | |
001048a3 | 633 | mddev->new_layout = 0; |
9af204cf TM |
634 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
635 | mddev->raid_disks--; | |
636 | mddev->delta_disks = -1; | |
637 | /* make sure it will be not marked as dirty */ | |
638 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 639 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
640 | |
641 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 642 | |
9af204cf TM |
643 | return priv_conf; |
644 | } | |
645 | ||
fd01b88c | 646 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 647 | { |
e373ab10 | 648 | struct r0conf *priv_conf; |
9af204cf TM |
649 | |
650 | /* Check layout: | |
651 | * - far_copies must be 1 | |
652 | * - near_copies must be 2 | |
653 | * - disks number must be even | |
654 | * - all mirrors must be already degraded | |
655 | */ | |
656 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
657 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
658 | mdname(mddev), | |
659 | mddev->layout); | |
9af204cf TM |
660 | return ERR_PTR(-EINVAL); |
661 | } | |
662 | if (mddev->raid_disks & 1) { | |
76603884 N |
663 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
664 | mdname(mddev)); | |
9af204cf TM |
665 | return ERR_PTR(-EINVAL); |
666 | } | |
667 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
668 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
669 | mdname(mddev)); | |
9af204cf TM |
670 | return ERR_PTR(-EINVAL); |
671 | } | |
672 | ||
673 | /* Set new parameters */ | |
674 | mddev->new_level = 0; | |
001048a3 | 675 | mddev->new_layout = 0; |
9af204cf TM |
676 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
677 | mddev->delta_disks = - mddev->raid_disks / 2; | |
678 | mddev->raid_disks += mddev->delta_disks; | |
679 | mddev->degraded = 0; | |
680 | /* make sure it will be not marked as dirty */ | |
681 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 682 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
683 | |
684 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
685 | return priv_conf; |
686 | } | |
687 | ||
fd01b88c | 688 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 689 | { |
e373ab10 | 690 | struct r0conf *priv_conf; |
24b961f8 | 691 | int chunksect; |
fc3a08b8 KW |
692 | |
693 | /* Check layout: | |
694 | * - (N - 1) mirror drives must be already faulty | |
695 | */ | |
696 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 697 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
698 | mdname(mddev)); |
699 | return ERR_PTR(-EINVAL); | |
700 | } | |
701 | ||
24b961f8 JS |
702 | /* |
703 | * a raid1 doesn't have the notion of chunk size, so | |
704 | * figure out the largest suitable size we can use. | |
705 | */ | |
706 | chunksect = 64 * 2; /* 64K by default */ | |
707 | ||
708 | /* The array must be an exact multiple of chunksize */ | |
709 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
710 | chunksect >>= 1; | |
711 | ||
712 | if ((chunksect << 9) < PAGE_SIZE) | |
713 | /* array size does not allow a suitable chunk size */ | |
714 | return ERR_PTR(-EINVAL); | |
715 | ||
fc3a08b8 KW |
716 | /* Set new parameters */ |
717 | mddev->new_level = 0; | |
718 | mddev->new_layout = 0; | |
24b961f8 JS |
719 | mddev->new_chunk_sectors = chunksect; |
720 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 721 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 722 | mddev->raid_disks = 1; |
fc3a08b8 KW |
723 | /* make sure it will be not marked as dirty */ |
724 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 725 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
726 | |
727 | create_strip_zones(mddev, &priv_conf); | |
728 | return priv_conf; | |
729 | } | |
730 | ||
fd01b88c | 731 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
732 | { |
733 | /* raid0 can take over: | |
049d6c1e | 734 | * raid4 - if all data disks are active. |
9af204cf TM |
735 | * raid5 - providing it is Raid4 layout and one disk is faulty |
736 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 737 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 738 | */ |
a8461a61 N |
739 | |
740 | if (mddev->bitmap) { | |
76603884 N |
741 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
742 | mdname(mddev)); | |
a8461a61 N |
743 | return ERR_PTR(-EBUSY); |
744 | } | |
049d6c1e MT |
745 | if (mddev->level == 4) |
746 | return raid0_takeover_raid45(mddev); | |
747 | ||
9af204cf TM |
748 | if (mddev->level == 5) { |
749 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 750 | return raid0_takeover_raid45(mddev); |
9af204cf | 751 | |
76603884 N |
752 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
753 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
754 | } |
755 | ||
756 | if (mddev->level == 10) | |
757 | return raid0_takeover_raid10(mddev); | |
758 | ||
fc3a08b8 KW |
759 | if (mddev->level == 1) |
760 | return raid0_takeover_raid1(mddev); | |
761 | ||
76603884 | 762 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
763 | mddev->level); |
764 | ||
9af204cf TM |
765 | return ERR_PTR(-EINVAL); |
766 | } | |
767 | ||
b03e0ccb | 768 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
769 | { |
770 | } | |
771 | ||
84fc4b56 | 772 | static struct md_personality raid0_personality= |
1da177e4 LT |
773 | { |
774 | .name = "raid0", | |
2604b703 | 775 | .level = 0, |
1da177e4 LT |
776 | .owner = THIS_MODULE, |
777 | .make_request = raid0_make_request, | |
778 | .run = raid0_run, | |
afa0f557 | 779 | .free = raid0_free, |
1da177e4 | 780 | .status = raid0_status, |
80c3a6ce | 781 | .size = raid0_size, |
9af204cf TM |
782 | .takeover = raid0_takeover, |
783 | .quiesce = raid0_quiesce, | |
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"); |