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Commit | Line | Data |
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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 AP |
32 | (1L << MD_FAILFAST_SUPPORTED) |\ |
33 | (1L << MD_HAS_PPL)) | |
394ed8e4 | 34 | |
5c675f83 | 35 | static int raid0_congested(struct mddev *mddev, int bits) |
26be34dc | 36 | { |
e373ab10 | 37 | struct r0conf *conf = mddev->private; |
3cb03002 | 38 | struct md_rdev **devlist = conf->devlist; |
84707f38 | 39 | int raid_disks = conf->strip_zone[0].nb_dev; |
26be34dc N |
40 | int i, ret = 0; |
41 | ||
84707f38 | 42 | for (i = 0; i < raid_disks && !ret ; i++) { |
165125e1 | 43 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
26be34dc | 44 | |
dc3b17cc | 45 | ret |= bdi_congested(q->backing_dev_info, bits); |
26be34dc N |
46 | } |
47 | return ret; | |
48 | } | |
49 | ||
46994191 | 50 | /* |
51 | * inform the user of the raid configuration | |
52 | */ | |
fd01b88c | 53 | static void dump_zones(struct mddev *mddev) |
46994191 | 54 | { |
50de8df4 | 55 | int j, k; |
46994191 | 56 | sector_t zone_size = 0; |
57 | sector_t zone_start = 0; | |
58 | char b[BDEVNAME_SIZE]; | |
e373ab10 | 59 | struct r0conf *conf = mddev->private; |
84707f38 | 60 | int raid_disks = conf->strip_zone[0].nb_dev; |
76603884 N |
61 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
62 | mdname(mddev), | |
63 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); | |
46994191 | 64 | for (j = 0; j < conf->nr_strip_zones; j++) { |
76603884 N |
65 | char line[200]; |
66 | int len = 0; | |
67 | ||
46994191 | 68 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
76603884 N |
69 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
70 | bdevname(conf->devlist[j*raid_disks | |
71 | + k]->bdev, b)); | |
72 | pr_debug("md: zone%d=[%s]\n", j, line); | |
46994191 | 73 | |
74 | zone_size = conf->strip_zone[j].zone_end - zone_start; | |
76603884 | 75 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
46994191 | 76 | (unsigned long long)zone_start>>1, |
77 | (unsigned long long)conf->strip_zone[j].dev_start>>1, | |
78 | (unsigned long long)zone_size>>1); | |
79 | zone_start = conf->strip_zone[j].zone_end; | |
80 | } | |
46994191 | 81 | } |
82 | ||
e373ab10 | 83 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
1da177e4 | 84 | { |
a9f326eb | 85 | int i, c, err; |
49f357a2 | 86 | sector_t curr_zone_end, sectors; |
3cb03002 | 87 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
1da177e4 LT |
88 | struct strip_zone *zone; |
89 | int cnt; | |
90 | char b[BDEVNAME_SIZE]; | |
50de8df4 | 91 | char b2[BDEVNAME_SIZE]; |
e373ab10 | 92 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
199dc6ed | 93 | unsigned short blksize = 512; |
ed7b0038 | 94 | |
7dedd15d | 95 | *private_conf = ERR_PTR(-ENOMEM); |
ed7b0038 AN |
96 | if (!conf) |
97 | return -ENOMEM; | |
dafb20fa | 98 | rdev_for_each(rdev1, mddev) { |
50de8df4 N |
99 | pr_debug("md/raid0:%s: looking at %s\n", |
100 | mdname(mddev), | |
101 | bdevname(rdev1->bdev, b)); | |
1da177e4 | 102 | c = 0; |
13f2682b N |
103 | |
104 | /* round size to chunk_size */ | |
105 | sectors = rdev1->sectors; | |
106 | sector_div(sectors, mddev->chunk_sectors); | |
107 | rdev1->sectors = sectors * mddev->chunk_sectors; | |
108 | ||
199dc6ed N |
109 | blksize = max(blksize, queue_logical_block_size( |
110 | rdev1->bdev->bd_disk->queue)); | |
111 | ||
dafb20fa | 112 | rdev_for_each(rdev2, mddev) { |
50de8df4 N |
113 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
114 | " with %s(%llu)\n", | |
115 | mdname(mddev), | |
116 | bdevname(rdev1->bdev,b), | |
117 | (unsigned long long)rdev1->sectors, | |
118 | bdevname(rdev2->bdev,b2), | |
119 | (unsigned long long)rdev2->sectors); | |
1da177e4 | 120 | if (rdev2 == rdev1) { |
50de8df4 N |
121 | pr_debug("md/raid0:%s: END\n", |
122 | mdname(mddev)); | |
1da177e4 LT |
123 | break; |
124 | } | |
dd8ac336 | 125 | if (rdev2->sectors == rdev1->sectors) { |
1da177e4 LT |
126 | /* |
127 | * Not unique, don't count it as a new | |
128 | * group | |
129 | */ | |
50de8df4 N |
130 | pr_debug("md/raid0:%s: EQUAL\n", |
131 | mdname(mddev)); | |
1da177e4 LT |
132 | c = 1; |
133 | break; | |
134 | } | |
50de8df4 N |
135 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
136 | mdname(mddev)); | |
1da177e4 LT |
137 | } |
138 | if (!c) { | |
50de8df4 N |
139 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
140 | mdname(mddev)); | |
1da177e4 | 141 | conf->nr_strip_zones++; |
50de8df4 N |
142 | pr_debug("md/raid0:%s: %d zones\n", |
143 | mdname(mddev), conf->nr_strip_zones); | |
1da177e4 LT |
144 | } |
145 | } | |
50de8df4 N |
146 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
147 | mdname(mddev), conf->nr_strip_zones); | |
199dc6ed N |
148 | /* |
149 | * now since we have the hard sector sizes, we can make sure | |
150 | * chunk size is a multiple of that sector size | |
151 | */ | |
152 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
153 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
154 | mdname(mddev), | |
155 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
156 | err = -EINVAL; |
157 | goto abort; | |
158 | } | |
159 | ||
ed7b0038 | 160 | err = -ENOMEM; |
9ffae0cf | 161 | conf->strip_zone = kzalloc(sizeof(struct strip_zone)* |
1da177e4 LT |
162 | conf->nr_strip_zones, GFP_KERNEL); |
163 | if (!conf->strip_zone) | |
ed7b0038 | 164 | goto abort; |
3cb03002 | 165 | conf->devlist = kzalloc(sizeof(struct md_rdev*)* |
1da177e4 LT |
166 | conf->nr_strip_zones*mddev->raid_disks, |
167 | GFP_KERNEL); | |
168 | if (!conf->devlist) | |
ed7b0038 | 169 | goto abort; |
1da177e4 | 170 | |
1da177e4 LT |
171 | /* The first zone must contain all devices, so here we check that |
172 | * there is a proper alignment of slots to devices and find them all | |
173 | */ | |
174 | zone = &conf->strip_zone[0]; | |
175 | cnt = 0; | |
176 | smallest = NULL; | |
b414579f | 177 | dev = conf->devlist; |
ed7b0038 | 178 | err = -EINVAL; |
dafb20fa | 179 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
180 | int j = rdev1->raid_disk; |
181 | ||
e93f68a1 | 182 | if (mddev->level == 10) { |
9af204cf TM |
183 | /* taking over a raid10-n2 array */ |
184 | j /= 2; | |
e93f68a1 N |
185 | rdev1->new_raid_disk = j; |
186 | } | |
9af204cf | 187 | |
fc3a08b8 KW |
188 | if (mddev->level == 1) { |
189 | /* taiking over a raid1 array- | |
190 | * we have only one active disk | |
191 | */ | |
192 | j = 0; | |
193 | rdev1->new_raid_disk = j; | |
194 | } | |
195 | ||
f96c9f30 | 196 | if (j < 0) { |
76603884 N |
197 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
198 | mdname(mddev)); | |
f96c9f30 N |
199 | goto abort; |
200 | } | |
201 | if (j >= mddev->raid_disks) { | |
76603884 N |
202 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
203 | mdname(mddev), j); | |
1da177e4 LT |
204 | goto abort; |
205 | } | |
b414579f | 206 | if (dev[j]) { |
76603884 N |
207 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
208 | mdname(mddev), j); | |
1da177e4 LT |
209 | goto abort; |
210 | } | |
b414579f | 211 | dev[j] = rdev1; |
1da177e4 | 212 | |
dd8ac336 | 213 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
214 | smallest = rdev1; |
215 | cnt++; | |
216 | } | |
217 | if (cnt != mddev->raid_disks) { | |
76603884 N |
218 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
219 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
220 | goto abort; |
221 | } | |
222 | zone->nb_dev = cnt; | |
49f357a2 | 223 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 224 | |
49f357a2 | 225 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
226 | |
227 | /* now do the other zones */ | |
228 | for (i = 1; i < conf->nr_strip_zones; i++) | |
229 | { | |
a9f326eb N |
230 | int j; |
231 | ||
1da177e4 | 232 | zone = conf->strip_zone + i; |
b414579f | 233 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 234 | |
50de8df4 | 235 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 236 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
237 | smallest = NULL; |
238 | c = 0; | |
239 | ||
240 | for (j=0; j<cnt; j++) { | |
b414579f | 241 | rdev = conf->devlist[j]; |
d27a43ab | 242 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
243 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
244 | mdname(mddev), | |
245 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
246 | continue; |
247 | } | |
50de8df4 N |
248 | pr_debug("md/raid0:%s: checking %s ..." |
249 | " contained as device %d\n", | |
250 | mdname(mddev), | |
251 | bdevname(rdev->bdev, b), c); | |
b414579f | 252 | dev[c] = rdev; |
dd8ac336 AN |
253 | c++; |
254 | if (!smallest || rdev->sectors < smallest->sectors) { | |
255 | smallest = rdev; | |
50de8df4 N |
256 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
257 | mdname(mddev), | |
258 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 259 | } |
1da177e4 LT |
260 | } |
261 | ||
262 | zone->nb_dev = c; | |
49f357a2 | 263 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
264 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
265 | mdname(mddev), | |
266 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 267 | |
49f357a2 | 268 | curr_zone_end += sectors; |
d27a43ab | 269 | zone->zone_end = curr_zone_end; |
1da177e4 | 270 | |
50de8df4 N |
271 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
272 | mdname(mddev), | |
273 | (unsigned long long)smallest->sectors); | |
1da177e4 | 274 | } |
1da177e4 | 275 | |
50de8df4 | 276 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
9af204cf TM |
277 | *private_conf = conf; |
278 | ||
1da177e4 | 279 | return 0; |
5568a603 | 280 | abort: |
ed7b0038 AN |
281 | kfree(conf->strip_zone); |
282 | kfree(conf->devlist); | |
283 | kfree(conf); | |
58ebb34c | 284 | *private_conf = ERR_PTR(err); |
ed7b0038 | 285 | return err; |
1da177e4 LT |
286 | } |
287 | ||
ba13da47 N |
288 | /* Find the zone which holds a particular offset |
289 | * Update *sectorp to be an offset in that zone | |
290 | */ | |
291 | static struct strip_zone *find_zone(struct r0conf *conf, | |
292 | sector_t *sectorp) | |
293 | { | |
294 | int i; | |
295 | struct strip_zone *z = conf->strip_zone; | |
296 | sector_t sector = *sectorp; | |
297 | ||
298 | for (i = 0; i < conf->nr_strip_zones; i++) | |
299 | if (sector < z[i].zone_end) { | |
300 | if (i) | |
301 | *sectorp = sector - z[i-1].zone_end; | |
302 | return z + i; | |
303 | } | |
304 | BUG(); | |
305 | } | |
306 | ||
307 | /* | |
308 | * remaps the bio to the target device. we separate two flows. | |
47d68979 | 309 | * power 2 flow and a general flow for the sake of performance |
ba13da47 N |
310 | */ |
311 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, | |
312 | sector_t sector, sector_t *sector_offset) | |
313 | { | |
314 | unsigned int sect_in_chunk; | |
315 | sector_t chunk; | |
316 | struct r0conf *conf = mddev->private; | |
317 | int raid_disks = conf->strip_zone[0].nb_dev; | |
318 | unsigned int chunk_sects = mddev->chunk_sectors; | |
319 | ||
320 | if (is_power_of_2(chunk_sects)) { | |
321 | int chunksect_bits = ffz(~chunk_sects); | |
322 | /* find the sector offset inside the chunk */ | |
323 | sect_in_chunk = sector & (chunk_sects - 1); | |
324 | sector >>= chunksect_bits; | |
325 | /* chunk in zone */ | |
326 | chunk = *sector_offset; | |
327 | /* quotient is the chunk in real device*/ | |
328 | sector_div(chunk, zone->nb_dev << chunksect_bits); | |
329 | } else{ | |
330 | sect_in_chunk = sector_div(sector, chunk_sects); | |
331 | chunk = *sector_offset; | |
332 | sector_div(chunk, chunk_sects * zone->nb_dev); | |
333 | } | |
334 | /* | |
335 | * position the bio over the real device | |
336 | * real sector = chunk in device + starting of zone | |
337 | * + the position in the chunk | |
338 | */ | |
339 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; | |
340 | return conf->devlist[(zone - conf->strip_zone)*raid_disks | |
341 | + sector_div(sector, zone->nb_dev)]; | |
342 | } | |
343 | ||
fd01b88c | 344 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
345 | { |
346 | sector_t array_sectors = 0; | |
3cb03002 | 347 | struct md_rdev *rdev; |
80c3a6ce DW |
348 | |
349 | WARN_ONCE(sectors || raid_disks, | |
350 | "%s does not support generic reshape\n", __func__); | |
351 | ||
dafb20fa | 352 | rdev_for_each(rdev, mddev) |
a6468539 N |
353 | array_sectors += (rdev->sectors & |
354 | ~(sector_t)(mddev->chunk_sectors-1)); | |
80c3a6ce DW |
355 | |
356 | return array_sectors; | |
357 | } | |
358 | ||
afa0f557 | 359 | static void raid0_free(struct mddev *mddev, void *priv); |
0366ef84 | 360 | |
fd01b88c | 361 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 362 | { |
e373ab10 | 363 | struct r0conf *conf; |
5568a603 | 364 | int ret; |
1da177e4 | 365 | |
9d8f0363 | 366 | if (mddev->chunk_sectors == 0) { |
76603884 | 367 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
368 | return -EINVAL; |
369 | } | |
0894cc30 AN |
370 | if (md_check_no_bitmap(mddev)) |
371 | return -EINVAL; | |
753f2856 | 372 | |
9af204cf TM |
373 | /* if private is not null, we are here after takeover */ |
374 | if (mddev->private == NULL) { | |
375 | ret = create_strip_zones(mddev, &conf); | |
376 | if (ret < 0) | |
377 | return ret; | |
378 | mddev->private = conf; | |
379 | } | |
380 | conf = mddev->private; | |
199dc6ed N |
381 | if (mddev->queue) { |
382 | struct md_rdev *rdev; | |
383 | bool discard_supported = false; | |
384 | ||
199dc6ed N |
385 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
386 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 387 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
199dc6ed N |
388 | blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors); |
389 | ||
390 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
391 | blk_queue_io_opt(mddev->queue, | |
392 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
393 | ||
66eefe5d N |
394 | rdev_for_each(rdev, mddev) { |
395 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
396 | rdev->data_offset << 9); | |
397 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
398 | discard_supported = true; | |
399 | } | |
199dc6ed N |
400 | if (!discard_supported) |
401 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); | |
402 | else | |
403 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); | |
404 | } | |
1da177e4 LT |
405 | |
406 | /* calculate array device size */ | |
1f403624 | 407 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 408 | |
76603884 N |
409 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
410 | mdname(mddev), | |
411 | (unsigned long long)mddev->array_sectors); | |
753f2856 HM |
412 | |
413 | if (mddev->queue) { | |
414 | /* calculate the max read-ahead size. | |
415 | * For read-ahead of large files to be effective, we need to | |
416 | * readahead at least twice a whole stripe. i.e. number of devices | |
417 | * multiplied by chunk size times 2. | |
418 | * If an individual device has an ra_pages greater than the | |
419 | * chunk size, then we will not drive that device as hard as it | |
420 | * wants. We consider this a configuration error: a larger | |
421 | * chunksize should be used in that case. | |
422 | */ | |
9d8f0363 AN |
423 | int stripe = mddev->raid_disks * |
424 | (mddev->chunk_sectors << 9) / PAGE_SIZE; | |
dc3b17cc JK |
425 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
426 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; | |
1da177e4 LT |
427 | } |
428 | ||
46994191 | 429 | dump_zones(mddev); |
0366ef84 | 430 | |
431 | ret = md_integrity_register(mddev); | |
0366ef84 | 432 | |
433 | return ret; | |
1da177e4 LT |
434 | } |
435 | ||
afa0f557 | 436 | static void raid0_free(struct mddev *mddev, void *priv) |
1da177e4 | 437 | { |
afa0f557 | 438 | struct r0conf *conf = priv; |
1da177e4 | 439 | |
990a8baf | 440 | kfree(conf->strip_zone); |
fb5ab4b5 | 441 | kfree(conf->devlist); |
990a8baf | 442 | kfree(conf); |
1da177e4 LT |
443 | } |
444 | ||
fbb704ef | 445 | /* |
446 | * Is io distribute over 1 or more chunks ? | |
447 | */ | |
fd01b88c | 448 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
fbb704ef | 449 | unsigned int chunk_sects, struct bio *bio) |
450 | { | |
d6e412ea | 451 | if (likely(is_power_of_2(chunk_sects))) { |
4f024f37 KO |
452 | return chunk_sects >= |
453 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) | |
aa8b57aa | 454 | + bio_sectors(bio)); |
fbb704ef | 455 | } else{ |
4f024f37 | 456 | sector_t sector = bio->bi_iter.bi_sector; |
fbb704ef | 457 | return chunk_sects >= (sector_div(sector, chunk_sects) |
aa8b57aa | 458 | + bio_sectors(bio)); |
fbb704ef | 459 | } |
460 | } | |
461 | ||
b4fdcb02 | 462 | static void raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 463 | { |
1da177e4 | 464 | struct strip_zone *zone; |
3cb03002 | 465 | struct md_rdev *tmp_dev; |
f00d7c85 N |
466 | sector_t bio_sector; |
467 | sector_t sector; | |
468 | unsigned chunk_sects; | |
469 | unsigned sectors; | |
1da177e4 | 470 | |
1eff9d32 | 471 | if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { |
e9c7469b | 472 | md_flush_request(mddev, bio); |
5a7bbad2 | 473 | return; |
e5dcdd80 N |
474 | } |
475 | ||
f00d7c85 N |
476 | bio_sector = bio->bi_iter.bi_sector; |
477 | sector = bio_sector; | |
478 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 479 | |
f00d7c85 N |
480 | sectors = chunk_sects - |
481 | (likely(is_power_of_2(chunk_sects)) | |
482 | ? (sector & (chunk_sects-1)) | |
483 | : sector_div(sector, chunk_sects)); | |
20d0189b | 484 | |
f00d7c85 N |
485 | /* Restore due to sector_div */ |
486 | sector = bio_sector; | |
a8115776 | 487 | |
f00d7c85 N |
488 | if (sectors < bio_sectors(bio)) { |
489 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, mddev->bio_set); | |
490 | bio_chain(split, bio); | |
491 | generic_make_request(bio); | |
492 | bio = split; | |
493 | } | |
1da177e4 | 494 | |
f00d7c85 N |
495 | zone = find_zone(mddev->private, §or); |
496 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
497 | bio->bi_bdev = tmp_dev->bdev; | |
498 | bio->bi_iter.bi_sector = sector + zone->dev_start + | |
499 | tmp_dev->data_offset; | |
500 | ||
501 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && | |
502 | !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) { | |
503 | /* Just ignore it */ | |
504 | bio_endio(bio); | |
505 | } else { | |
506 | if (mddev->gendisk) | |
507 | trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), | |
508 | bio, disk_devt(mddev->gendisk), | |
509 | bio_sector); | |
510 | mddev_check_writesame(mddev, bio); | |
e265eb3a | 511 | mddev_check_write_zeroes(mddev, bio); |
f00d7c85 N |
512 | generic_make_request(bio); |
513 | } | |
1da177e4 | 514 | } |
8299d7f7 | 515 | |
fd01b88c | 516 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 517 | { |
9d8f0363 | 518 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
519 | return; |
520 | } | |
521 | ||
fd01b88c | 522 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 523 | { |
3cb03002 | 524 | struct md_rdev *rdev; |
e373ab10 | 525 | struct r0conf *priv_conf; |
9af204cf TM |
526 | |
527 | if (mddev->degraded != 1) { | |
76603884 N |
528 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
529 | mdname(mddev), | |
530 | mddev->degraded); | |
9af204cf TM |
531 | return ERR_PTR(-EINVAL); |
532 | } | |
533 | ||
dafb20fa | 534 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
535 | /* check slot number for a disk */ |
536 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
537 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
538 | mdname(mddev)); | |
9af204cf TM |
539 | return ERR_PTR(-EINVAL); |
540 | } | |
eea136d6 | 541 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
542 | } |
543 | ||
544 | /* Set new parameters */ | |
545 | mddev->new_level = 0; | |
001048a3 | 546 | mddev->new_layout = 0; |
9af204cf TM |
547 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
548 | mddev->raid_disks--; | |
549 | mddev->delta_disks = -1; | |
550 | /* make sure it will be not marked as dirty */ | |
551 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 552 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
553 | |
554 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 555 | |
9af204cf TM |
556 | return priv_conf; |
557 | } | |
558 | ||
fd01b88c | 559 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 560 | { |
e373ab10 | 561 | struct r0conf *priv_conf; |
9af204cf TM |
562 | |
563 | /* Check layout: | |
564 | * - far_copies must be 1 | |
565 | * - near_copies must be 2 | |
566 | * - disks number must be even | |
567 | * - all mirrors must be already degraded | |
568 | */ | |
569 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
570 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
571 | mdname(mddev), | |
572 | mddev->layout); | |
9af204cf TM |
573 | return ERR_PTR(-EINVAL); |
574 | } | |
575 | if (mddev->raid_disks & 1) { | |
76603884 N |
576 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
577 | mdname(mddev)); | |
9af204cf TM |
578 | return ERR_PTR(-EINVAL); |
579 | } | |
580 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
581 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
582 | mdname(mddev)); | |
9af204cf TM |
583 | return ERR_PTR(-EINVAL); |
584 | } | |
585 | ||
586 | /* Set new parameters */ | |
587 | mddev->new_level = 0; | |
001048a3 | 588 | mddev->new_layout = 0; |
9af204cf TM |
589 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
590 | mddev->delta_disks = - mddev->raid_disks / 2; | |
591 | mddev->raid_disks += mddev->delta_disks; | |
592 | mddev->degraded = 0; | |
593 | /* make sure it will be not marked as dirty */ | |
594 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 595 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
596 | |
597 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
598 | return priv_conf; |
599 | } | |
600 | ||
fd01b88c | 601 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 602 | { |
e373ab10 | 603 | struct r0conf *priv_conf; |
24b961f8 | 604 | int chunksect; |
fc3a08b8 KW |
605 | |
606 | /* Check layout: | |
607 | * - (N - 1) mirror drives must be already faulty | |
608 | */ | |
609 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 610 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
611 | mdname(mddev)); |
612 | return ERR_PTR(-EINVAL); | |
613 | } | |
614 | ||
24b961f8 JS |
615 | /* |
616 | * a raid1 doesn't have the notion of chunk size, so | |
617 | * figure out the largest suitable size we can use. | |
618 | */ | |
619 | chunksect = 64 * 2; /* 64K by default */ | |
620 | ||
621 | /* The array must be an exact multiple of chunksize */ | |
622 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
623 | chunksect >>= 1; | |
624 | ||
625 | if ((chunksect << 9) < PAGE_SIZE) | |
626 | /* array size does not allow a suitable chunk size */ | |
627 | return ERR_PTR(-EINVAL); | |
628 | ||
fc3a08b8 KW |
629 | /* Set new parameters */ |
630 | mddev->new_level = 0; | |
631 | mddev->new_layout = 0; | |
24b961f8 JS |
632 | mddev->new_chunk_sectors = chunksect; |
633 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 634 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 635 | mddev->raid_disks = 1; |
fc3a08b8 KW |
636 | /* make sure it will be not marked as dirty */ |
637 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 638 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
639 | |
640 | create_strip_zones(mddev, &priv_conf); | |
641 | return priv_conf; | |
642 | } | |
643 | ||
fd01b88c | 644 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
645 | { |
646 | /* raid0 can take over: | |
049d6c1e | 647 | * raid4 - if all data disks are active. |
9af204cf TM |
648 | * raid5 - providing it is Raid4 layout and one disk is faulty |
649 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 650 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 651 | */ |
a8461a61 N |
652 | |
653 | if (mddev->bitmap) { | |
76603884 N |
654 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
655 | mdname(mddev)); | |
a8461a61 N |
656 | return ERR_PTR(-EBUSY); |
657 | } | |
049d6c1e MT |
658 | if (mddev->level == 4) |
659 | return raid0_takeover_raid45(mddev); | |
660 | ||
9af204cf TM |
661 | if (mddev->level == 5) { |
662 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 663 | return raid0_takeover_raid45(mddev); |
9af204cf | 664 | |
76603884 N |
665 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
666 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
667 | } |
668 | ||
669 | if (mddev->level == 10) | |
670 | return raid0_takeover_raid10(mddev); | |
671 | ||
fc3a08b8 KW |
672 | if (mddev->level == 1) |
673 | return raid0_takeover_raid1(mddev); | |
674 | ||
76603884 | 675 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
676 | mddev->level); |
677 | ||
9af204cf TM |
678 | return ERR_PTR(-EINVAL); |
679 | } | |
680 | ||
fd01b88c | 681 | static void raid0_quiesce(struct mddev *mddev, int state) |
9af204cf TM |
682 | { |
683 | } | |
684 | ||
84fc4b56 | 685 | static struct md_personality raid0_personality= |
1da177e4 LT |
686 | { |
687 | .name = "raid0", | |
2604b703 | 688 | .level = 0, |
1da177e4 LT |
689 | .owner = THIS_MODULE, |
690 | .make_request = raid0_make_request, | |
691 | .run = raid0_run, | |
afa0f557 | 692 | .free = raid0_free, |
1da177e4 | 693 | .status = raid0_status, |
80c3a6ce | 694 | .size = raid0_size, |
9af204cf TM |
695 | .takeover = raid0_takeover, |
696 | .quiesce = raid0_quiesce, | |
5c675f83 | 697 | .congested = raid0_congested, |
1da177e4 LT |
698 | }; |
699 | ||
700 | static int __init raid0_init (void) | |
701 | { | |
2604b703 | 702 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
703 | } |
704 | ||
705 | static void raid0_exit (void) | |
706 | { | |
2604b703 | 707 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
708 | } |
709 | ||
710 | module_init(raid0_init); | |
711 | module_exit(raid0_exit); | |
712 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 713 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 714 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 715 | MODULE_ALIAS("md-raid0"); |
2604b703 | 716 | MODULE_ALIAS("md-level-0"); |