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