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1da177e4 LT |
1 | /* |
2 | raid0.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1994-96 Marc ZYNGIER |
1da177e4 LT |
4 | <zyngier@ufr-info-p7.ibp.fr> or |
5 | <maz@gloups.fdn.fr> | |
f72ffdd6 | 6 | Copyright (C) 1999, 2000 Ingo Molnar, Red Hat |
1da177e4 LT |
7 | |
8 | RAID-0 management functions. | |
9 | ||
10 | This program is free software; you can redistribute it and/or modify | |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2, or (at your option) | |
13 | any later version. | |
f72ffdd6 | 14 | |
1da177e4 LT |
15 | You should have received a copy of the GNU General Public License |
16 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
f72ffdd6 | 17 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
1da177e4 LT |
18 | */ |
19 | ||
bff61975 | 20 | #include <linux/blkdev.h> |
bff61975 | 21 | #include <linux/seq_file.h> |
056075c7 | 22 | #include <linux/module.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
109e3765 | 24 | #include <trace/events/block.h> |
43b2e5d8 | 25 | #include "md.h" |
ef740c37 | 26 | #include "raid0.h" |
9af204cf | 27 | #include "raid5.h" |
1da177e4 | 28 | |
394ed8e4 SL |
29 | #define UNSUPPORTED_MDDEV_FLAGS \ |
30 | ((1L << MD_HAS_JOURNAL) | \ | |
31 | (1L << MD_JOURNAL_CLEAN) | \ | |
ea0213e0 | 32 | (1L << MD_FAILFAST_SUPPORTED) |\ |
ddc08823 PB |
33 | (1L << MD_HAS_PPL) | \ |
34 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 35 | |
5c675f83 | 36 | static int raid0_congested(struct mddev *mddev, int bits) |
26be34dc | 37 | { |
e373ab10 | 38 | struct r0conf *conf = mddev->private; |
3cb03002 | 39 | struct md_rdev **devlist = conf->devlist; |
84707f38 | 40 | int raid_disks = conf->strip_zone[0].nb_dev; |
26be34dc N |
41 | int i, ret = 0; |
42 | ||
84707f38 | 43 | for (i = 0; i < raid_disks && !ret ; i++) { |
165125e1 | 44 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
26be34dc | 45 | |
dc3b17cc | 46 | ret |= bdi_congested(q->backing_dev_info, bits); |
26be34dc N |
47 | } |
48 | return ret; | |
49 | } | |
50 | ||
46994191 | 51 | /* |
52 | * inform the user of the raid configuration | |
53 | */ | |
fd01b88c | 54 | static void dump_zones(struct mddev *mddev) |
46994191 | 55 | { |
50de8df4 | 56 | int j, k; |
46994191 | 57 | sector_t zone_size = 0; |
58 | sector_t zone_start = 0; | |
59 | char b[BDEVNAME_SIZE]; | |
e373ab10 | 60 | struct r0conf *conf = mddev->private; |
84707f38 | 61 | int raid_disks = conf->strip_zone[0].nb_dev; |
76603884 N |
62 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
63 | mdname(mddev), | |
64 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); | |
46994191 | 65 | for (j = 0; j < conf->nr_strip_zones; j++) { |
76603884 N |
66 | char line[200]; |
67 | int len = 0; | |
68 | ||
46994191 | 69 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
76603884 N |
70 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
71 | bdevname(conf->devlist[j*raid_disks | |
72 | + k]->bdev, b)); | |
73 | pr_debug("md: zone%d=[%s]\n", j, line); | |
46994191 | 74 | |
75 | zone_size = conf->strip_zone[j].zone_end - zone_start; | |
76603884 | 76 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
46994191 | 77 | (unsigned long long)zone_start>>1, |
78 | (unsigned long long)conf->strip_zone[j].dev_start>>1, | |
79 | (unsigned long long)zone_size>>1); | |
80 | zone_start = conf->strip_zone[j].zone_end; | |
81 | } | |
46994191 | 82 | } |
83 | ||
e373ab10 | 84 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
1da177e4 | 85 | { |
a9f326eb | 86 | int i, c, err; |
49f357a2 | 87 | sector_t curr_zone_end, sectors; |
3cb03002 | 88 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
1da177e4 LT |
89 | struct strip_zone *zone; |
90 | int cnt; | |
91 | char b[BDEVNAME_SIZE]; | |
50de8df4 | 92 | char b2[BDEVNAME_SIZE]; |
e373ab10 | 93 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
199dc6ed | 94 | unsigned short blksize = 512; |
ed7b0038 | 95 | |
7dedd15d | 96 | *private_conf = ERR_PTR(-ENOMEM); |
ed7b0038 AN |
97 | if (!conf) |
98 | return -ENOMEM; | |
dafb20fa | 99 | rdev_for_each(rdev1, mddev) { |
50de8df4 N |
100 | pr_debug("md/raid0:%s: looking at %s\n", |
101 | mdname(mddev), | |
102 | bdevname(rdev1->bdev, b)); | |
1da177e4 | 103 | c = 0; |
13f2682b N |
104 | |
105 | /* round size to chunk_size */ | |
106 | sectors = rdev1->sectors; | |
107 | sector_div(sectors, mddev->chunk_sectors); | |
108 | rdev1->sectors = sectors * mddev->chunk_sectors; | |
109 | ||
199dc6ed N |
110 | blksize = max(blksize, queue_logical_block_size( |
111 | rdev1->bdev->bd_disk->queue)); | |
112 | ||
dafb20fa | 113 | rdev_for_each(rdev2, mddev) { |
50de8df4 N |
114 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
115 | " with %s(%llu)\n", | |
116 | mdname(mddev), | |
117 | bdevname(rdev1->bdev,b), | |
118 | (unsigned long long)rdev1->sectors, | |
119 | bdevname(rdev2->bdev,b2), | |
120 | (unsigned long long)rdev2->sectors); | |
1da177e4 | 121 | if (rdev2 == rdev1) { |
50de8df4 N |
122 | pr_debug("md/raid0:%s: END\n", |
123 | mdname(mddev)); | |
1da177e4 LT |
124 | break; |
125 | } | |
dd8ac336 | 126 | if (rdev2->sectors == rdev1->sectors) { |
1da177e4 LT |
127 | /* |
128 | * Not unique, don't count it as a new | |
129 | * group | |
130 | */ | |
50de8df4 N |
131 | pr_debug("md/raid0:%s: EQUAL\n", |
132 | mdname(mddev)); | |
1da177e4 LT |
133 | c = 1; |
134 | break; | |
135 | } | |
50de8df4 N |
136 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
137 | mdname(mddev)); | |
1da177e4 LT |
138 | } |
139 | if (!c) { | |
50de8df4 N |
140 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
141 | mdname(mddev)); | |
1da177e4 | 142 | conf->nr_strip_zones++; |
50de8df4 N |
143 | pr_debug("md/raid0:%s: %d zones\n", |
144 | mdname(mddev), conf->nr_strip_zones); | |
1da177e4 LT |
145 | } |
146 | } | |
50de8df4 N |
147 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
148 | mdname(mddev), conf->nr_strip_zones); | |
199dc6ed N |
149 | /* |
150 | * now since we have the hard sector sizes, we can make sure | |
151 | * chunk size is a multiple of that sector size | |
152 | */ | |
153 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
154 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
155 | mdname(mddev), | |
156 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
157 | err = -EINVAL; |
158 | goto abort; | |
159 | } | |
160 | ||
ed7b0038 | 161 | err = -ENOMEM; |
6396bb22 KC |
162 | conf->strip_zone = kcalloc(conf->nr_strip_zones, |
163 | sizeof(struct strip_zone), | |
164 | GFP_KERNEL); | |
1da177e4 | 165 | if (!conf->strip_zone) |
ed7b0038 | 166 | goto abort; |
6396bb22 KC |
167 | conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), |
168 | conf->nr_strip_zones, | |
169 | mddev->raid_disks), | |
1da177e4 LT |
170 | GFP_KERNEL); |
171 | if (!conf->devlist) | |
ed7b0038 | 172 | goto abort; |
1da177e4 | 173 | |
1da177e4 LT |
174 | /* The first zone must contain all devices, so here we check that |
175 | * there is a proper alignment of slots to devices and find them all | |
176 | */ | |
177 | zone = &conf->strip_zone[0]; | |
178 | cnt = 0; | |
179 | smallest = NULL; | |
b414579f | 180 | dev = conf->devlist; |
ed7b0038 | 181 | err = -EINVAL; |
dafb20fa | 182 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
183 | int j = rdev1->raid_disk; |
184 | ||
e93f68a1 | 185 | if (mddev->level == 10) { |
9af204cf TM |
186 | /* taking over a raid10-n2 array */ |
187 | j /= 2; | |
e93f68a1 N |
188 | rdev1->new_raid_disk = j; |
189 | } | |
9af204cf | 190 | |
fc3a08b8 KW |
191 | if (mddev->level == 1) { |
192 | /* taiking over a raid1 array- | |
193 | * we have only one active disk | |
194 | */ | |
195 | j = 0; | |
196 | rdev1->new_raid_disk = j; | |
197 | } | |
198 | ||
f96c9f30 | 199 | if (j < 0) { |
76603884 N |
200 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
201 | mdname(mddev)); | |
f96c9f30 N |
202 | goto abort; |
203 | } | |
204 | if (j >= mddev->raid_disks) { | |
76603884 N |
205 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
206 | mdname(mddev), j); | |
1da177e4 LT |
207 | goto abort; |
208 | } | |
b414579f | 209 | if (dev[j]) { |
76603884 N |
210 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
211 | mdname(mddev), j); | |
1da177e4 LT |
212 | goto abort; |
213 | } | |
b414579f | 214 | dev[j] = rdev1; |
1da177e4 | 215 | |
dd8ac336 | 216 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
217 | smallest = rdev1; |
218 | cnt++; | |
219 | } | |
220 | if (cnt != mddev->raid_disks) { | |
76603884 N |
221 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
222 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
223 | goto abort; |
224 | } | |
225 | zone->nb_dev = cnt; | |
49f357a2 | 226 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 227 | |
49f357a2 | 228 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
229 | |
230 | /* now do the other zones */ | |
231 | for (i = 1; i < conf->nr_strip_zones; i++) | |
232 | { | |
a9f326eb N |
233 | int j; |
234 | ||
1da177e4 | 235 | zone = conf->strip_zone + i; |
b414579f | 236 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 237 | |
50de8df4 | 238 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 239 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
240 | smallest = NULL; |
241 | c = 0; | |
242 | ||
243 | for (j=0; j<cnt; j++) { | |
b414579f | 244 | rdev = conf->devlist[j]; |
d27a43ab | 245 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
246 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
247 | mdname(mddev), | |
248 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
249 | continue; |
250 | } | |
50de8df4 N |
251 | pr_debug("md/raid0:%s: checking %s ..." |
252 | " contained as device %d\n", | |
253 | mdname(mddev), | |
254 | bdevname(rdev->bdev, b), c); | |
b414579f | 255 | dev[c] = rdev; |
dd8ac336 AN |
256 | c++; |
257 | if (!smallest || rdev->sectors < smallest->sectors) { | |
258 | smallest = rdev; | |
50de8df4 N |
259 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
260 | mdname(mddev), | |
261 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 262 | } |
1da177e4 LT |
263 | } |
264 | ||
265 | zone->nb_dev = c; | |
49f357a2 | 266 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
267 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
268 | mdname(mddev), | |
269 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 270 | |
49f357a2 | 271 | curr_zone_end += sectors; |
d27a43ab | 272 | zone->zone_end = curr_zone_end; |
1da177e4 | 273 | |
50de8df4 N |
274 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
275 | mdname(mddev), | |
276 | (unsigned long long)smallest->sectors); | |
1da177e4 | 277 | } |
1da177e4 | 278 | |
50de8df4 | 279 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
9af204cf TM |
280 | *private_conf = conf; |
281 | ||
1da177e4 | 282 | return 0; |
5568a603 | 283 | abort: |
ed7b0038 AN |
284 | kfree(conf->strip_zone); |
285 | kfree(conf->devlist); | |
286 | kfree(conf); | |
58ebb34c | 287 | *private_conf = ERR_PTR(err); |
ed7b0038 | 288 | return err; |
1da177e4 LT |
289 | } |
290 | ||
ba13da47 N |
291 | /* Find the zone which holds a particular offset |
292 | * Update *sectorp to be an offset in that zone | |
293 | */ | |
294 | static struct strip_zone *find_zone(struct r0conf *conf, | |
295 | sector_t *sectorp) | |
296 | { | |
297 | int i; | |
298 | struct strip_zone *z = conf->strip_zone; | |
299 | sector_t sector = *sectorp; | |
300 | ||
301 | for (i = 0; i < conf->nr_strip_zones; i++) | |
302 | if (sector < z[i].zone_end) { | |
303 | if (i) | |
304 | *sectorp = sector - z[i-1].zone_end; | |
305 | return z + i; | |
306 | } | |
307 | BUG(); | |
308 | } | |
309 | ||
310 | /* | |
311 | * remaps the bio to the target device. we separate two flows. | |
47d68979 | 312 | * power 2 flow and a general flow for the sake of performance |
ba13da47 N |
313 | */ |
314 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, | |
315 | sector_t sector, sector_t *sector_offset) | |
316 | { | |
317 | unsigned int sect_in_chunk; | |
318 | sector_t chunk; | |
319 | struct r0conf *conf = mddev->private; | |
320 | int raid_disks = conf->strip_zone[0].nb_dev; | |
321 | unsigned int chunk_sects = mddev->chunk_sectors; | |
322 | ||
323 | if (is_power_of_2(chunk_sects)) { | |
324 | int chunksect_bits = ffz(~chunk_sects); | |
325 | /* find the sector offset inside the chunk */ | |
326 | sect_in_chunk = sector & (chunk_sects - 1); | |
327 | sector >>= chunksect_bits; | |
328 | /* chunk in zone */ | |
329 | chunk = *sector_offset; | |
330 | /* quotient is the chunk in real device*/ | |
331 | sector_div(chunk, zone->nb_dev << chunksect_bits); | |
332 | } else{ | |
333 | sect_in_chunk = sector_div(sector, chunk_sects); | |
334 | chunk = *sector_offset; | |
335 | sector_div(chunk, chunk_sects * zone->nb_dev); | |
336 | } | |
337 | /* | |
338 | * position the bio over the real device | |
339 | * real sector = chunk in device + starting of zone | |
340 | * + the position in the chunk | |
341 | */ | |
342 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; | |
343 | return conf->devlist[(zone - conf->strip_zone)*raid_disks | |
344 | + sector_div(sector, zone->nb_dev)]; | |
345 | } | |
346 | ||
fd01b88c | 347 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
348 | { |
349 | sector_t array_sectors = 0; | |
3cb03002 | 350 | struct md_rdev *rdev; |
80c3a6ce DW |
351 | |
352 | WARN_ONCE(sectors || raid_disks, | |
353 | "%s does not support generic reshape\n", __func__); | |
354 | ||
dafb20fa | 355 | rdev_for_each(rdev, mddev) |
a6468539 N |
356 | array_sectors += (rdev->sectors & |
357 | ~(sector_t)(mddev->chunk_sectors-1)); | |
80c3a6ce DW |
358 | |
359 | return array_sectors; | |
360 | } | |
361 | ||
afa0f557 | 362 | static void raid0_free(struct mddev *mddev, void *priv); |
0366ef84 | 363 | |
fd01b88c | 364 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 365 | { |
e373ab10 | 366 | struct r0conf *conf; |
5568a603 | 367 | int ret; |
1da177e4 | 368 | |
9d8f0363 | 369 | if (mddev->chunk_sectors == 0) { |
76603884 | 370 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
371 | return -EINVAL; |
372 | } | |
0894cc30 AN |
373 | if (md_check_no_bitmap(mddev)) |
374 | return -EINVAL; | |
753f2856 | 375 | |
9af204cf TM |
376 | /* if private is not null, we are here after takeover */ |
377 | if (mddev->private == NULL) { | |
378 | ret = create_strip_zones(mddev, &conf); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | mddev->private = conf; | |
382 | } | |
383 | conf = mddev->private; | |
199dc6ed N |
384 | if (mddev->queue) { |
385 | struct md_rdev *rdev; | |
386 | bool discard_supported = false; | |
387 | ||
199dc6ed N |
388 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
389 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 390 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 391 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
392 | |
393 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
394 | blk_queue_io_opt(mddev->queue, | |
395 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
396 | ||
66eefe5d N |
397 | rdev_for_each(rdev, mddev) { |
398 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
399 | rdev->data_offset << 9); | |
400 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
401 | discard_supported = true; | |
402 | } | |
199dc6ed | 403 | if (!discard_supported) |
8b904b5b | 404 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 405 | else |
8b904b5b | 406 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 407 | } |
1da177e4 LT |
408 | |
409 | /* calculate array device size */ | |
1f403624 | 410 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 411 | |
76603884 N |
412 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
413 | mdname(mddev), | |
414 | (unsigned long long)mddev->array_sectors); | |
753f2856 HM |
415 | |
416 | if (mddev->queue) { | |
417 | /* calculate the max read-ahead size. | |
418 | * For read-ahead of large files to be effective, we need to | |
419 | * readahead at least twice a whole stripe. i.e. number of devices | |
420 | * multiplied by chunk size times 2. | |
421 | * If an individual device has an ra_pages greater than the | |
422 | * chunk size, then we will not drive that device as hard as it | |
423 | * wants. We consider this a configuration error: a larger | |
424 | * chunksize should be used in that case. | |
425 | */ | |
9d8f0363 AN |
426 | int stripe = mddev->raid_disks * |
427 | (mddev->chunk_sectors << 9) / PAGE_SIZE; | |
dc3b17cc JK |
428 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
429 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; | |
1da177e4 LT |
430 | } |
431 | ||
46994191 | 432 | dump_zones(mddev); |
0366ef84 | 433 | |
434 | ret = md_integrity_register(mddev); | |
0366ef84 | 435 | |
436 | return ret; | |
1da177e4 LT |
437 | } |
438 | ||
afa0f557 | 439 | static void raid0_free(struct mddev *mddev, void *priv) |
1da177e4 | 440 | { |
afa0f557 | 441 | struct r0conf *conf = priv; |
1da177e4 | 442 | |
990a8baf | 443 | kfree(conf->strip_zone); |
fb5ab4b5 | 444 | kfree(conf->devlist); |
990a8baf | 445 | kfree(conf); |
1da177e4 LT |
446 | } |
447 | ||
fbb704ef | 448 | /* |
449 | * Is io distribute over 1 or more chunks ? | |
450 | */ | |
fd01b88c | 451 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
fbb704ef | 452 | unsigned int chunk_sects, struct bio *bio) |
453 | { | |
d6e412ea | 454 | if (likely(is_power_of_2(chunk_sects))) { |
4f024f37 KO |
455 | return chunk_sects >= |
456 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) | |
aa8b57aa | 457 | + bio_sectors(bio)); |
fbb704ef | 458 | } else{ |
4f024f37 | 459 | sector_t sector = bio->bi_iter.bi_sector; |
fbb704ef | 460 | return chunk_sects >= (sector_div(sector, chunk_sects) |
aa8b57aa | 461 | + bio_sectors(bio)); |
fbb704ef | 462 | } |
463 | } | |
464 | ||
29efc390 SL |
465 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
466 | { | |
467 | struct r0conf *conf = mddev->private; | |
468 | struct strip_zone *zone; | |
469 | sector_t start = bio->bi_iter.bi_sector; | |
470 | sector_t end; | |
471 | unsigned int stripe_size; | |
472 | sector_t first_stripe_index, last_stripe_index; | |
473 | sector_t start_disk_offset; | |
474 | unsigned int start_disk_index; | |
475 | sector_t end_disk_offset; | |
476 | unsigned int end_disk_index; | |
477 | unsigned int disk; | |
478 | ||
479 | zone = find_zone(conf, &start); | |
480 | ||
481 | if (bio_end_sector(bio) > zone->zone_end) { | |
482 | struct bio *split = bio_split(bio, | |
483 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
afeee514 | 484 | &mddev->bio_set); |
29efc390 SL |
485 | bio_chain(split, bio); |
486 | generic_make_request(bio); | |
487 | bio = split; | |
488 | end = zone->zone_end; | |
489 | } else | |
490 | end = bio_end_sector(bio); | |
491 | ||
492 | if (zone != conf->strip_zone) | |
493 | end = end - zone[-1].zone_end; | |
494 | ||
495 | /* Now start and end is the offset in zone */ | |
496 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
497 | ||
498 | first_stripe_index = start; | |
499 | sector_div(first_stripe_index, stripe_size); | |
500 | last_stripe_index = end; | |
501 | sector_div(last_stripe_index, stripe_size); | |
502 | ||
503 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
504 | mddev->chunk_sectors; | |
505 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
506 | mddev->chunk_sectors) + | |
507 | first_stripe_index * mddev->chunk_sectors; | |
508 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
509 | mddev->chunk_sectors; | |
510 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
511 | mddev->chunk_sectors) + | |
512 | last_stripe_index * mddev->chunk_sectors; | |
513 | ||
514 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
515 | sector_t dev_start, dev_end; | |
516 | struct bio *discard_bio = NULL; | |
517 | struct md_rdev *rdev; | |
518 | ||
519 | if (disk < start_disk_index) | |
520 | dev_start = (first_stripe_index + 1) * | |
521 | mddev->chunk_sectors; | |
522 | else if (disk > start_disk_index) | |
523 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
524 | else | |
525 | dev_start = start_disk_offset; | |
526 | ||
527 | if (disk < end_disk_index) | |
528 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
529 | else if (disk > end_disk_index) | |
530 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
531 | else | |
532 | dev_end = end_disk_offset; | |
533 | ||
534 | if (dev_end <= dev_start) | |
535 | continue; | |
536 | ||
537 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
538 | conf->strip_zone[0].nb_dev + disk]; | |
539 | if (__blkdev_issue_discard(rdev->bdev, | |
540 | dev_start + zone->dev_start + rdev->data_offset, | |
541 | dev_end - dev_start, GFP_NOIO, 0, &discard_bio) || | |
542 | !discard_bio) | |
543 | continue; | |
544 | bio_chain(discard_bio, bio); | |
db6638d7 | 545 | bio_clone_blkg_association(discard_bio, bio); |
29efc390 SL |
546 | if (mddev->gendisk) |
547 | trace_block_bio_remap(bdev_get_queue(rdev->bdev), | |
548 | discard_bio, disk_devt(mddev->gendisk), | |
549 | bio->bi_iter.bi_sector); | |
550 | generic_make_request(discard_bio); | |
551 | } | |
552 | bio_endio(bio); | |
553 | } | |
554 | ||
cc27b0c7 | 555 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 556 | { |
1da177e4 | 557 | struct strip_zone *zone; |
3cb03002 | 558 | struct md_rdev *tmp_dev; |
f00d7c85 N |
559 | sector_t bio_sector; |
560 | sector_t sector; | |
561 | unsigned chunk_sects; | |
562 | unsigned sectors; | |
1da177e4 | 563 | |
1eff9d32 | 564 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
e9c7469b | 565 | md_flush_request(mddev, bio); |
cc27b0c7 | 566 | return true; |
e5dcdd80 N |
567 | } |
568 | ||
29efc390 SL |
569 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
570 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 571 | return true; |
29efc390 SL |
572 | } |
573 | ||
f00d7c85 N |
574 | bio_sector = bio->bi_iter.bi_sector; |
575 | sector = bio_sector; | |
576 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 577 | |
f00d7c85 N |
578 | sectors = chunk_sects - |
579 | (likely(is_power_of_2(chunk_sects)) | |
580 | ? (sector & (chunk_sects-1)) | |
581 | : sector_div(sector, chunk_sects)); | |
20d0189b | 582 | |
f00d7c85 N |
583 | /* Restore due to sector_div */ |
584 | sector = bio_sector; | |
a8115776 | 585 | |
f00d7c85 | 586 | if (sectors < bio_sectors(bio)) { |
afeee514 KO |
587 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, |
588 | &mddev->bio_set); | |
f00d7c85 N |
589 | bio_chain(split, bio); |
590 | generic_make_request(bio); | |
591 | bio = split; | |
592 | } | |
1da177e4 | 593 | |
f00d7c85 N |
594 | zone = find_zone(mddev->private, §or); |
595 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
74d46992 | 596 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
597 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
598 | tmp_dev->data_offset; | |
599 | ||
29efc390 | 600 | if (mddev->gendisk) |
74d46992 CH |
601 | trace_block_bio_remap(bio->bi_disk->queue, bio, |
602 | disk_devt(mddev->gendisk), bio_sector); | |
29efc390 SL |
603 | mddev_check_writesame(mddev, bio); |
604 | mddev_check_write_zeroes(mddev, bio); | |
605 | generic_make_request(bio); | |
cc27b0c7 | 606 | return true; |
1da177e4 | 607 | } |
8299d7f7 | 608 | |
fd01b88c | 609 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 610 | { |
9d8f0363 | 611 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
612 | return; |
613 | } | |
614 | ||
fd01b88c | 615 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 616 | { |
3cb03002 | 617 | struct md_rdev *rdev; |
e373ab10 | 618 | struct r0conf *priv_conf; |
9af204cf TM |
619 | |
620 | if (mddev->degraded != 1) { | |
76603884 N |
621 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
622 | mdname(mddev), | |
623 | mddev->degraded); | |
9af204cf TM |
624 | return ERR_PTR(-EINVAL); |
625 | } | |
626 | ||
dafb20fa | 627 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
628 | /* check slot number for a disk */ |
629 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
630 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
631 | mdname(mddev)); | |
9af204cf TM |
632 | return ERR_PTR(-EINVAL); |
633 | } | |
eea136d6 | 634 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
635 | } |
636 | ||
637 | /* Set new parameters */ | |
638 | mddev->new_level = 0; | |
001048a3 | 639 | mddev->new_layout = 0; |
9af204cf TM |
640 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
641 | mddev->raid_disks--; | |
642 | mddev->delta_disks = -1; | |
643 | /* make sure it will be not marked as dirty */ | |
644 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 645 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
646 | |
647 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 648 | |
9af204cf TM |
649 | return priv_conf; |
650 | } | |
651 | ||
fd01b88c | 652 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 653 | { |
e373ab10 | 654 | struct r0conf *priv_conf; |
9af204cf TM |
655 | |
656 | /* Check layout: | |
657 | * - far_copies must be 1 | |
658 | * - near_copies must be 2 | |
659 | * - disks number must be even | |
660 | * - all mirrors must be already degraded | |
661 | */ | |
662 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
663 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
664 | mdname(mddev), | |
665 | mddev->layout); | |
9af204cf TM |
666 | return ERR_PTR(-EINVAL); |
667 | } | |
668 | if (mddev->raid_disks & 1) { | |
76603884 N |
669 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
670 | mdname(mddev)); | |
9af204cf TM |
671 | return ERR_PTR(-EINVAL); |
672 | } | |
673 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
674 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
675 | mdname(mddev)); | |
9af204cf TM |
676 | return ERR_PTR(-EINVAL); |
677 | } | |
678 | ||
679 | /* Set new parameters */ | |
680 | mddev->new_level = 0; | |
001048a3 | 681 | mddev->new_layout = 0; |
9af204cf TM |
682 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
683 | mddev->delta_disks = - mddev->raid_disks / 2; | |
684 | mddev->raid_disks += mddev->delta_disks; | |
685 | mddev->degraded = 0; | |
686 | /* make sure it will be not marked as dirty */ | |
687 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 688 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
689 | |
690 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
691 | return priv_conf; |
692 | } | |
693 | ||
fd01b88c | 694 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 695 | { |
e373ab10 | 696 | struct r0conf *priv_conf; |
24b961f8 | 697 | int chunksect; |
fc3a08b8 KW |
698 | |
699 | /* Check layout: | |
700 | * - (N - 1) mirror drives must be already faulty | |
701 | */ | |
702 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 703 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
704 | mdname(mddev)); |
705 | return ERR_PTR(-EINVAL); | |
706 | } | |
707 | ||
24b961f8 JS |
708 | /* |
709 | * a raid1 doesn't have the notion of chunk size, so | |
710 | * figure out the largest suitable size we can use. | |
711 | */ | |
712 | chunksect = 64 * 2; /* 64K by default */ | |
713 | ||
714 | /* The array must be an exact multiple of chunksize */ | |
715 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
716 | chunksect >>= 1; | |
717 | ||
718 | if ((chunksect << 9) < PAGE_SIZE) | |
719 | /* array size does not allow a suitable chunk size */ | |
720 | return ERR_PTR(-EINVAL); | |
721 | ||
fc3a08b8 KW |
722 | /* Set new parameters */ |
723 | mddev->new_level = 0; | |
724 | mddev->new_layout = 0; | |
24b961f8 JS |
725 | mddev->new_chunk_sectors = chunksect; |
726 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 727 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 728 | mddev->raid_disks = 1; |
fc3a08b8 KW |
729 | /* make sure it will be not marked as dirty */ |
730 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 731 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
732 | |
733 | create_strip_zones(mddev, &priv_conf); | |
734 | return priv_conf; | |
735 | } | |
736 | ||
fd01b88c | 737 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
738 | { |
739 | /* raid0 can take over: | |
049d6c1e | 740 | * raid4 - if all data disks are active. |
9af204cf TM |
741 | * raid5 - providing it is Raid4 layout and one disk is faulty |
742 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 743 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 744 | */ |
a8461a61 N |
745 | |
746 | if (mddev->bitmap) { | |
76603884 N |
747 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
748 | mdname(mddev)); | |
a8461a61 N |
749 | return ERR_PTR(-EBUSY); |
750 | } | |
049d6c1e MT |
751 | if (mddev->level == 4) |
752 | return raid0_takeover_raid45(mddev); | |
753 | ||
9af204cf TM |
754 | if (mddev->level == 5) { |
755 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 756 | return raid0_takeover_raid45(mddev); |
9af204cf | 757 | |
76603884 N |
758 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
759 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
760 | } |
761 | ||
762 | if (mddev->level == 10) | |
763 | return raid0_takeover_raid10(mddev); | |
764 | ||
fc3a08b8 KW |
765 | if (mddev->level == 1) |
766 | return raid0_takeover_raid1(mddev); | |
767 | ||
76603884 | 768 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
769 | mddev->level); |
770 | ||
9af204cf TM |
771 | return ERR_PTR(-EINVAL); |
772 | } | |
773 | ||
b03e0ccb | 774 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
775 | { |
776 | } | |
777 | ||
84fc4b56 | 778 | static struct md_personality raid0_personality= |
1da177e4 LT |
779 | { |
780 | .name = "raid0", | |
2604b703 | 781 | .level = 0, |
1da177e4 LT |
782 | .owner = THIS_MODULE, |
783 | .make_request = raid0_make_request, | |
784 | .run = raid0_run, | |
afa0f557 | 785 | .free = raid0_free, |
1da177e4 | 786 | .status = raid0_status, |
80c3a6ce | 787 | .size = raid0_size, |
9af204cf TM |
788 | .takeover = raid0_takeover, |
789 | .quiesce = raid0_quiesce, | |
5c675f83 | 790 | .congested = raid0_congested, |
1da177e4 LT |
791 | }; |
792 | ||
793 | static int __init raid0_init (void) | |
794 | { | |
2604b703 | 795 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
796 | } |
797 | ||
798 | static void raid0_exit (void) | |
799 | { | |
2604b703 | 800 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
801 | } |
802 | ||
803 | module_init(raid0_init); | |
804 | module_exit(raid0_exit); | |
805 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 806 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 807 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 808 | MODULE_ALIAS("md-raid0"); |
2604b703 | 809 | MODULE_ALIAS("md-level-0"); |