Commit | Line | Data |
---|---|---|
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; |
9ffae0cf | 162 | conf->strip_zone = kzalloc(sizeof(struct strip_zone)* |
1da177e4 LT |
163 | conf->nr_strip_zones, GFP_KERNEL); |
164 | if (!conf->strip_zone) | |
ed7b0038 | 165 | goto abort; |
3cb03002 | 166 | conf->devlist = kzalloc(sizeof(struct md_rdev*)* |
1da177e4 LT |
167 | conf->nr_strip_zones*mddev->raid_disks, |
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 | ||
afa0f557 | 360 | static void raid0_free(struct mddev *mddev, void *priv); |
0366ef84 | 361 | |
fd01b88c | 362 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 363 | { |
e373ab10 | 364 | struct r0conf *conf; |
5568a603 | 365 | int ret; |
1da177e4 | 366 | |
9d8f0363 | 367 | if (mddev->chunk_sectors == 0) { |
76603884 | 368 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
369 | return -EINVAL; |
370 | } | |
0894cc30 AN |
371 | if (md_check_no_bitmap(mddev)) |
372 | return -EINVAL; | |
753f2856 | 373 | |
9af204cf TM |
374 | /* if private is not null, we are here after takeover */ |
375 | if (mddev->private == NULL) { | |
376 | ret = create_strip_zones(mddev, &conf); | |
377 | if (ret < 0) | |
378 | return ret; | |
379 | mddev->private = conf; | |
380 | } | |
381 | conf = mddev->private; | |
199dc6ed N |
382 | if (mddev->queue) { |
383 | struct md_rdev *rdev; | |
384 | bool discard_supported = false; | |
385 | ||
199dc6ed N |
386 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
387 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 388 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 389 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
390 | |
391 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
392 | blk_queue_io_opt(mddev->queue, | |
393 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
394 | ||
66eefe5d N |
395 | rdev_for_each(rdev, mddev) { |
396 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
397 | rdev->data_offset << 9); | |
398 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
399 | discard_supported = true; | |
400 | } | |
199dc6ed N |
401 | if (!discard_supported) |
402 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); | |
403 | else | |
404 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); | |
405 | } | |
1da177e4 LT |
406 | |
407 | /* calculate array device size */ | |
1f403624 | 408 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 409 | |
76603884 N |
410 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
411 | mdname(mddev), | |
412 | (unsigned long long)mddev->array_sectors); | |
753f2856 HM |
413 | |
414 | if (mddev->queue) { | |
415 | /* calculate the max read-ahead size. | |
416 | * For read-ahead of large files to be effective, we need to | |
417 | * readahead at least twice a whole stripe. i.e. number of devices | |
418 | * multiplied by chunk size times 2. | |
419 | * If an individual device has an ra_pages greater than the | |
420 | * chunk size, then we will not drive that device as hard as it | |
421 | * wants. We consider this a configuration error: a larger | |
422 | * chunksize should be used in that case. | |
423 | */ | |
9d8f0363 AN |
424 | int stripe = mddev->raid_disks * |
425 | (mddev->chunk_sectors << 9) / PAGE_SIZE; | |
dc3b17cc JK |
426 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
427 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; | |
1da177e4 LT |
428 | } |
429 | ||
46994191 | 430 | dump_zones(mddev); |
0366ef84 | 431 | |
432 | ret = md_integrity_register(mddev); | |
0366ef84 | 433 | |
434 | return ret; | |
1da177e4 LT |
435 | } |
436 | ||
afa0f557 | 437 | static void raid0_free(struct mddev *mddev, void *priv) |
1da177e4 | 438 | { |
afa0f557 | 439 | struct r0conf *conf = priv; |
1da177e4 | 440 | |
990a8baf | 441 | kfree(conf->strip_zone); |
fb5ab4b5 | 442 | kfree(conf->devlist); |
990a8baf | 443 | kfree(conf); |
1da177e4 LT |
444 | } |
445 | ||
fbb704ef | 446 | /* |
447 | * Is io distribute over 1 or more chunks ? | |
448 | */ | |
fd01b88c | 449 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
fbb704ef | 450 | unsigned int chunk_sects, struct bio *bio) |
451 | { | |
d6e412ea | 452 | if (likely(is_power_of_2(chunk_sects))) { |
4f024f37 KO |
453 | return chunk_sects >= |
454 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) | |
aa8b57aa | 455 | + bio_sectors(bio)); |
fbb704ef | 456 | } else{ |
4f024f37 | 457 | sector_t sector = bio->bi_iter.bi_sector; |
fbb704ef | 458 | return chunk_sects >= (sector_div(sector, chunk_sects) |
aa8b57aa | 459 | + bio_sectors(bio)); |
fbb704ef | 460 | } |
461 | } | |
462 | ||
29efc390 SL |
463 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
464 | { | |
465 | struct r0conf *conf = mddev->private; | |
466 | struct strip_zone *zone; | |
467 | sector_t start = bio->bi_iter.bi_sector; | |
468 | sector_t end; | |
469 | unsigned int stripe_size; | |
470 | sector_t first_stripe_index, last_stripe_index; | |
471 | sector_t start_disk_offset; | |
472 | unsigned int start_disk_index; | |
473 | sector_t end_disk_offset; | |
474 | unsigned int end_disk_index; | |
475 | unsigned int disk; | |
476 | ||
477 | zone = find_zone(conf, &start); | |
478 | ||
479 | if (bio_end_sector(bio) > zone->zone_end) { | |
480 | struct bio *split = bio_split(bio, | |
481 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
482 | mddev->bio_set); | |
483 | bio_chain(split, bio); | |
484 | generic_make_request(bio); | |
485 | bio = split; | |
486 | end = zone->zone_end; | |
487 | } else | |
488 | end = bio_end_sector(bio); | |
489 | ||
490 | if (zone != conf->strip_zone) | |
491 | end = end - zone[-1].zone_end; | |
492 | ||
493 | /* Now start and end is the offset in zone */ | |
494 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
495 | ||
496 | first_stripe_index = start; | |
497 | sector_div(first_stripe_index, stripe_size); | |
498 | last_stripe_index = end; | |
499 | sector_div(last_stripe_index, stripe_size); | |
500 | ||
501 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
502 | mddev->chunk_sectors; | |
503 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
504 | mddev->chunk_sectors) + | |
505 | first_stripe_index * mddev->chunk_sectors; | |
506 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
507 | mddev->chunk_sectors; | |
508 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
509 | mddev->chunk_sectors) + | |
510 | last_stripe_index * mddev->chunk_sectors; | |
511 | ||
512 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
513 | sector_t dev_start, dev_end; | |
514 | struct bio *discard_bio = NULL; | |
515 | struct md_rdev *rdev; | |
516 | ||
517 | if (disk < start_disk_index) | |
518 | dev_start = (first_stripe_index + 1) * | |
519 | mddev->chunk_sectors; | |
520 | else if (disk > start_disk_index) | |
521 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
522 | else | |
523 | dev_start = start_disk_offset; | |
524 | ||
525 | if (disk < end_disk_index) | |
526 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
527 | else if (disk > end_disk_index) | |
528 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
529 | else | |
530 | dev_end = end_disk_offset; | |
531 | ||
532 | if (dev_end <= dev_start) | |
533 | continue; | |
534 | ||
535 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
536 | conf->strip_zone[0].nb_dev + disk]; | |
537 | if (__blkdev_issue_discard(rdev->bdev, | |
538 | dev_start + zone->dev_start + rdev->data_offset, | |
539 | dev_end - dev_start, GFP_NOIO, 0, &discard_bio) || | |
540 | !discard_bio) | |
541 | continue; | |
542 | bio_chain(discard_bio, bio); | |
8a8e6f84 | 543 | bio_clone_blkcg_association(discard_bio, bio); |
29efc390 SL |
544 | if (mddev->gendisk) |
545 | trace_block_bio_remap(bdev_get_queue(rdev->bdev), | |
546 | discard_bio, disk_devt(mddev->gendisk), | |
547 | bio->bi_iter.bi_sector); | |
548 | generic_make_request(discard_bio); | |
549 | } | |
550 | bio_endio(bio); | |
551 | } | |
552 | ||
cc27b0c7 | 553 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 554 | { |
1da177e4 | 555 | struct strip_zone *zone; |
3cb03002 | 556 | struct md_rdev *tmp_dev; |
f00d7c85 N |
557 | sector_t bio_sector; |
558 | sector_t sector; | |
559 | unsigned chunk_sects; | |
560 | unsigned sectors; | |
1da177e4 | 561 | |
1eff9d32 | 562 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
e9c7469b | 563 | md_flush_request(mddev, bio); |
cc27b0c7 | 564 | return true; |
e5dcdd80 N |
565 | } |
566 | ||
29efc390 SL |
567 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
568 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 569 | return true; |
29efc390 SL |
570 | } |
571 | ||
f00d7c85 N |
572 | bio_sector = bio->bi_iter.bi_sector; |
573 | sector = bio_sector; | |
574 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 575 | |
f00d7c85 N |
576 | sectors = chunk_sects - |
577 | (likely(is_power_of_2(chunk_sects)) | |
578 | ? (sector & (chunk_sects-1)) | |
579 | : sector_div(sector, chunk_sects)); | |
20d0189b | 580 | |
f00d7c85 N |
581 | /* Restore due to sector_div */ |
582 | sector = bio_sector; | |
a8115776 | 583 | |
f00d7c85 N |
584 | if (sectors < bio_sectors(bio)) { |
585 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, mddev->bio_set); | |
586 | bio_chain(split, bio); | |
587 | generic_make_request(bio); | |
588 | bio = split; | |
589 | } | |
1da177e4 | 590 | |
f00d7c85 N |
591 | zone = find_zone(mddev->private, §or); |
592 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
74d46992 | 593 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
594 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
595 | tmp_dev->data_offset; | |
596 | ||
29efc390 | 597 | if (mddev->gendisk) |
74d46992 CH |
598 | trace_block_bio_remap(bio->bi_disk->queue, bio, |
599 | disk_devt(mddev->gendisk), bio_sector); | |
29efc390 SL |
600 | mddev_check_writesame(mddev, bio); |
601 | mddev_check_write_zeroes(mddev, bio); | |
602 | generic_make_request(bio); | |
cc27b0c7 | 603 | return true; |
1da177e4 | 604 | } |
8299d7f7 | 605 | |
fd01b88c | 606 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 607 | { |
9d8f0363 | 608 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
609 | return; |
610 | } | |
611 | ||
fd01b88c | 612 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 613 | { |
3cb03002 | 614 | struct md_rdev *rdev; |
e373ab10 | 615 | struct r0conf *priv_conf; |
9af204cf TM |
616 | |
617 | if (mddev->degraded != 1) { | |
76603884 N |
618 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
619 | mdname(mddev), | |
620 | mddev->degraded); | |
9af204cf TM |
621 | return ERR_PTR(-EINVAL); |
622 | } | |
623 | ||
dafb20fa | 624 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
625 | /* check slot number for a disk */ |
626 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
627 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
628 | mdname(mddev)); | |
9af204cf TM |
629 | return ERR_PTR(-EINVAL); |
630 | } | |
eea136d6 | 631 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
632 | } |
633 | ||
634 | /* Set new parameters */ | |
635 | mddev->new_level = 0; | |
001048a3 | 636 | mddev->new_layout = 0; |
9af204cf TM |
637 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
638 | mddev->raid_disks--; | |
639 | mddev->delta_disks = -1; | |
640 | /* make sure it will be not marked as dirty */ | |
641 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 642 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
643 | |
644 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 645 | |
9af204cf TM |
646 | return priv_conf; |
647 | } | |
648 | ||
fd01b88c | 649 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 650 | { |
e373ab10 | 651 | struct r0conf *priv_conf; |
9af204cf TM |
652 | |
653 | /* Check layout: | |
654 | * - far_copies must be 1 | |
655 | * - near_copies must be 2 | |
656 | * - disks number must be even | |
657 | * - all mirrors must be already degraded | |
658 | */ | |
659 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
660 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
661 | mdname(mddev), | |
662 | mddev->layout); | |
9af204cf TM |
663 | return ERR_PTR(-EINVAL); |
664 | } | |
665 | if (mddev->raid_disks & 1) { | |
76603884 N |
666 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
667 | mdname(mddev)); | |
9af204cf TM |
668 | return ERR_PTR(-EINVAL); |
669 | } | |
670 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
671 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
672 | mdname(mddev)); | |
9af204cf TM |
673 | return ERR_PTR(-EINVAL); |
674 | } | |
675 | ||
676 | /* Set new parameters */ | |
677 | mddev->new_level = 0; | |
001048a3 | 678 | mddev->new_layout = 0; |
9af204cf TM |
679 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
680 | mddev->delta_disks = - mddev->raid_disks / 2; | |
681 | mddev->raid_disks += mddev->delta_disks; | |
682 | mddev->degraded = 0; | |
683 | /* make sure it will be not marked as dirty */ | |
684 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 685 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
686 | |
687 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
688 | return priv_conf; |
689 | } | |
690 | ||
fd01b88c | 691 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 692 | { |
e373ab10 | 693 | struct r0conf *priv_conf; |
24b961f8 | 694 | int chunksect; |
fc3a08b8 KW |
695 | |
696 | /* Check layout: | |
697 | * - (N - 1) mirror drives must be already faulty | |
698 | */ | |
699 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 700 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
701 | mdname(mddev)); |
702 | return ERR_PTR(-EINVAL); | |
703 | } | |
704 | ||
24b961f8 JS |
705 | /* |
706 | * a raid1 doesn't have the notion of chunk size, so | |
707 | * figure out the largest suitable size we can use. | |
708 | */ | |
709 | chunksect = 64 * 2; /* 64K by default */ | |
710 | ||
711 | /* The array must be an exact multiple of chunksize */ | |
712 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
713 | chunksect >>= 1; | |
714 | ||
715 | if ((chunksect << 9) < PAGE_SIZE) | |
716 | /* array size does not allow a suitable chunk size */ | |
717 | return ERR_PTR(-EINVAL); | |
718 | ||
fc3a08b8 KW |
719 | /* Set new parameters */ |
720 | mddev->new_level = 0; | |
721 | mddev->new_layout = 0; | |
24b961f8 JS |
722 | mddev->new_chunk_sectors = chunksect; |
723 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 724 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 725 | mddev->raid_disks = 1; |
fc3a08b8 KW |
726 | /* make sure it will be not marked as dirty */ |
727 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 728 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
729 | |
730 | create_strip_zones(mddev, &priv_conf); | |
731 | return priv_conf; | |
732 | } | |
733 | ||
fd01b88c | 734 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
735 | { |
736 | /* raid0 can take over: | |
049d6c1e | 737 | * raid4 - if all data disks are active. |
9af204cf TM |
738 | * raid5 - providing it is Raid4 layout and one disk is faulty |
739 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 740 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 741 | */ |
a8461a61 N |
742 | |
743 | if (mddev->bitmap) { | |
76603884 N |
744 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
745 | mdname(mddev)); | |
a8461a61 N |
746 | return ERR_PTR(-EBUSY); |
747 | } | |
049d6c1e MT |
748 | if (mddev->level == 4) |
749 | return raid0_takeover_raid45(mddev); | |
750 | ||
9af204cf TM |
751 | if (mddev->level == 5) { |
752 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 753 | return raid0_takeover_raid45(mddev); |
9af204cf | 754 | |
76603884 N |
755 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
756 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
757 | } |
758 | ||
759 | if (mddev->level == 10) | |
760 | return raid0_takeover_raid10(mddev); | |
761 | ||
fc3a08b8 KW |
762 | if (mddev->level == 1) |
763 | return raid0_takeover_raid1(mddev); | |
764 | ||
76603884 | 765 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
766 | mddev->level); |
767 | ||
9af204cf TM |
768 | return ERR_PTR(-EINVAL); |
769 | } | |
770 | ||
2fc45ef9 | 771 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
772 | { |
773 | } | |
774 | ||
84fc4b56 | 775 | static struct md_personality raid0_personality= |
1da177e4 LT |
776 | { |
777 | .name = "raid0", | |
2604b703 | 778 | .level = 0, |
1da177e4 LT |
779 | .owner = THIS_MODULE, |
780 | .make_request = raid0_make_request, | |
781 | .run = raid0_run, | |
afa0f557 | 782 | .free = raid0_free, |
1da177e4 | 783 | .status = raid0_status, |
80c3a6ce | 784 | .size = raid0_size, |
9af204cf TM |
785 | .takeover = raid0_takeover, |
786 | .quiesce = raid0_quiesce, | |
5c675f83 | 787 | .congested = raid0_congested, |
1da177e4 LT |
788 | }; |
789 | ||
790 | static int __init raid0_init (void) | |
791 | { | |
2604b703 | 792 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
793 | } |
794 | ||
795 | static void raid0_exit (void) | |
796 | { | |
2604b703 | 797 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
798 | } |
799 | ||
800 | module_init(raid0_init); | |
801 | module_exit(raid0_exit); | |
802 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 803 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 804 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 805 | MODULE_ALIAS("md-raid0"); |
2604b703 | 806 | MODULE_ALIAS("md-level-0"); |