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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / md / raid0.c
bloba162fedeb51a48ce31d18fbca5a51a0fe9204bf4
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 static int raid0_congested(struct mddev *mddev, int bits)
30 {
31 struct r0conf *conf = mddev->private;
32 struct md_rdev **devlist = conf->devlist;
33 int raid_disks = conf->strip_zone[0].nb_dev;
34 int i, ret = 0;
35
36 for (i = 0; i < raid_disks && !ret ; i++) {
37 struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
38
39 ret |= bdi_congested(&q->backing_dev_info, bits);
40 }
41 return ret;
42 }
43
44 /*
45 * inform the user of the raid configuration
46 */
47 static void dump_zones(struct mddev *mddev)
48 {
49 int j, k;
50 sector_t zone_size = 0;
51 sector_t zone_start = 0;
52 char b[BDEVNAME_SIZE];
53 struct r0conf *conf = mddev->private;
54 int raid_disks = conf->strip_zone[0].nb_dev;
55 pr_debug("md: RAID0 configuration for %s - %d zone%s\n",
56 mdname(mddev),
57 conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s");
58 for (j = 0; j < conf->nr_strip_zones; j++) {
59 char line[200];
60 int len = 0;
61
62 for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
63 len += snprintf(line+len, 200-len, "%s%s", k?"/":"",
64 bdevname(conf->devlist[j*raid_disks
65 + k]->bdev, b));
66 pr_debug("md: zone%d=[%s]\n", j, line);
67
68 zone_size = conf->strip_zone[j].zone_end - zone_start;
69 pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n",
70 (unsigned long long)zone_start>>1,
71 (unsigned long long)conf->strip_zone[j].dev_start>>1,
72 (unsigned long long)zone_size>>1);
73 zone_start = conf->strip_zone[j].zone_end;
74 }
75 }
76
77 static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf)
78 {
79 int i, c, err;
80 sector_t curr_zone_end, sectors;
81 struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev;
82 struct strip_zone *zone;
83 int cnt;
84 char b[BDEVNAME_SIZE];
85 char b2[BDEVNAME_SIZE];
86 struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
87 unsigned short blksize = 512;
88
89 *private_conf = ERR_PTR(-ENOMEM);
90 if (!conf)
91 return -ENOMEM;
92 rdev_for_each(rdev1, mddev) {
93 pr_debug("md/raid0:%s: looking at %s\n",
94 mdname(mddev),
95 bdevname(rdev1->bdev, b));
96 c = 0;
97
98 /* round size to chunk_size */
99 sectors = rdev1->sectors;
100 sector_div(sectors, mddev->chunk_sectors);
101 rdev1->sectors = sectors * mddev->chunk_sectors;
102
103 blksize = max(blksize, queue_logical_block_size(
104 rdev1->bdev->bd_disk->queue));
105
106 rdev_for_each(rdev2, mddev) {
107 pr_debug("md/raid0:%s: comparing %s(%llu)"
108 " with %s(%llu)\n",
109 mdname(mddev),
110 bdevname(rdev1->bdev,b),
111 (unsigned long long)rdev1->sectors,
112 bdevname(rdev2->bdev,b2),
113 (unsigned long long)rdev2->sectors);
114 if (rdev2 == rdev1) {
115 pr_debug("md/raid0:%s: END\n",
116 mdname(mddev));
117 break;
118 }
119 if (rdev2->sectors == rdev1->sectors) {
120 /*
121 * Not unique, don't count it as a new
122 * group
123 */
124 pr_debug("md/raid0:%s: EQUAL\n",
125 mdname(mddev));
126 c = 1;
127 break;
128 }
129 pr_debug("md/raid0:%s: NOT EQUAL\n",
130 mdname(mddev));
131 }
132 if (!c) {
133 pr_debug("md/raid0:%s: ==> UNIQUE\n",
134 mdname(mddev));
135 conf->nr_strip_zones++;
136 pr_debug("md/raid0:%s: %d zones\n",
137 mdname(mddev), conf->nr_strip_zones);
138 }
139 }
140 pr_debug("md/raid0:%s: FINAL %d zones\n",
141 mdname(mddev), conf->nr_strip_zones);
142 /*
143 * now since we have the hard sector sizes, we can make sure
144 * chunk size is a multiple of that sector size
145 */
146 if ((mddev->chunk_sectors << 9) % blksize) {
147 pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n",
148 mdname(mddev),
149 mddev->chunk_sectors << 9, blksize);
150 err = -EINVAL;
151 goto abort;
152 }
153
154 err = -ENOMEM;
155 conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
156 conf->nr_strip_zones, GFP_KERNEL);
157 if (!conf->strip_zone)
158 goto abort;
159 conf->devlist = kzalloc(sizeof(struct md_rdev*)*
160 conf->nr_strip_zones*mddev->raid_disks,
161 GFP_KERNEL);
162 if (!conf->devlist)
163 goto abort;
164
165 /* The first zone must contain all devices, so here we check that
166 * there is a proper alignment of slots to devices and find them all
167 */
168 zone = &conf->strip_zone[0];
169 cnt = 0;
170 smallest = NULL;
171 dev = conf->devlist;
172 err = -EINVAL;
173 rdev_for_each(rdev1, mddev) {
174 int j = rdev1->raid_disk;
175
176 if (mddev->level == 10) {
177 /* taking over a raid10-n2 array */
178 j /= 2;
179 rdev1->new_raid_disk = j;
180 }
181
182 if (mddev->level == 1) {
183 /* taiking over a raid1 array-
184 * we have only one active disk
185 */
186 j = 0;
187 rdev1->new_raid_disk = j;
188 }
189
190 if (j < 0) {
191 pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n",
192 mdname(mddev));
193 goto abort;
194 }
195 if (j >= mddev->raid_disks) {
196 pr_warn("md/raid0:%s: bad disk number %d - aborting!\n",
197 mdname(mddev), j);
198 goto abort;
199 }
200 if (dev[j]) {
201 pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n",
202 mdname(mddev), j);
203 goto abort;
204 }
205 dev[j] = rdev1;
206
207 if (!smallest || (rdev1->sectors < smallest->sectors))
208 smallest = rdev1;
209 cnt++;
210 }
211 if (cnt != mddev->raid_disks) {
212 pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n",
213 mdname(mddev), cnt, mddev->raid_disks);
214 goto abort;
215 }
216 zone->nb_dev = cnt;
217 zone->zone_end = smallest->sectors * cnt;
218
219 curr_zone_end = zone->zone_end;
220
221 /* now do the other zones */
222 for (i = 1; i < conf->nr_strip_zones; i++)
223 {
224 int j;
225
226 zone = conf->strip_zone + i;
227 dev = conf->devlist + i * mddev->raid_disks;
228
229 pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i);
230 zone->dev_start = smallest->sectors;
231 smallest = NULL;
232 c = 0;
233
234 for (j=0; j<cnt; j++) {
235 rdev = conf->devlist[j];
236 if (rdev->sectors <= zone->dev_start) {
237 pr_debug("md/raid0:%s: checking %s ... nope\n",
238 mdname(mddev),
239 bdevname(rdev->bdev, b));
240 continue;
241 }
242 pr_debug("md/raid0:%s: checking %s ..."
243 " contained as device %d\n",
244 mdname(mddev),
245 bdevname(rdev->bdev, b), c);
246 dev[c] = rdev;
247 c++;
248 if (!smallest || rdev->sectors < smallest->sectors) {
249 smallest = rdev;
250 pr_debug("md/raid0:%s: (%llu) is smallest!.\n",
251 mdname(mddev),
252 (unsigned long long)rdev->sectors);
253 }
254 }
255
256 zone->nb_dev = c;
257 sectors = (smallest->sectors - zone->dev_start) * c;
258 pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
259 mdname(mddev),
260 zone->nb_dev, (unsigned long long)sectors);
261
262 curr_zone_end += sectors;
263 zone->zone_end = curr_zone_end;
264
265 pr_debug("md/raid0:%s: current zone start: %llu\n",
266 mdname(mddev),
267 (unsigned long long)smallest->sectors);
268 }
269
270 pr_debug("md/raid0:%s: done.\n", mdname(mddev));
271 *private_conf = conf;
272
273 return 0;
274 abort:
275 kfree(conf->strip_zone);
276 kfree(conf->devlist);
277 kfree(conf);
278 *private_conf = ERR_PTR(err);
279 return err;
280 }
281
282 /* Find the zone which holds a particular offset
283 * Update *sectorp to be an offset in that zone
284 */
285 static struct strip_zone *find_zone(struct r0conf *conf,
286 sector_t *sectorp)
287 {
288 int i;
289 struct strip_zone *z = conf->strip_zone;
290 sector_t sector = *sectorp;
291
292 for (i = 0; i < conf->nr_strip_zones; i++)
293 if (sector < z[i].zone_end) {
294 if (i)
295 *sectorp = sector - z[i-1].zone_end;
296 return z + i;
297 }
298 BUG();
299 }
300
301 /*
302 * remaps the bio to the target device. we separate two flows.
303 * power 2 flow and a general flow for the sake of performance
304 */
305 static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone,
306 sector_t sector, sector_t *sector_offset)
307 {
308 unsigned int sect_in_chunk;
309 sector_t chunk;
310 struct r0conf *conf = mddev->private;
311 int raid_disks = conf->strip_zone[0].nb_dev;
312 unsigned int chunk_sects = mddev->chunk_sectors;
313
314 if (is_power_of_2(chunk_sects)) {
315 int chunksect_bits = ffz(~chunk_sects);
316 /* find the sector offset inside the chunk */
317 sect_in_chunk = sector & (chunk_sects - 1);
318 sector >>= chunksect_bits;
319 /* chunk in zone */
320 chunk = *sector_offset;
321 /* quotient is the chunk in real device*/
322 sector_div(chunk, zone->nb_dev << chunksect_bits);
323 } else{
324 sect_in_chunk = sector_div(sector, chunk_sects);
325 chunk = *sector_offset;
326 sector_div(chunk, chunk_sects * zone->nb_dev);
327 }
328 /*
329 * position the bio over the real device
330 * real sector = chunk in device + starting of zone
331 * + the position in the chunk
332 */
333 *sector_offset = (chunk * chunk_sects) + sect_in_chunk;
334 return conf->devlist[(zone - conf->strip_zone)*raid_disks
335 + sector_div(sector, zone->nb_dev)];
336 }
337
338 static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks)
339 {
340 sector_t array_sectors = 0;
341 struct md_rdev *rdev;
342
343 WARN_ONCE(sectors || raid_disks,
344 "%s does not support generic reshape\n", __func__);
345
346 rdev_for_each(rdev, mddev)
347 array_sectors += (rdev->sectors &
348 ~(sector_t)(mddev->chunk_sectors-1));
349
350 return array_sectors;
351 }
352
353 static void raid0_free(struct mddev *mddev, void *priv);
354
355 static int raid0_run(struct mddev *mddev)
356 {
357 struct r0conf *conf;
358 int ret;
359
360 if (mddev->chunk_sectors == 0) {
361 pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev));
362 return -EINVAL;
363 }
364 if (md_check_no_bitmap(mddev))
365 return -EINVAL;
366
367 /* if private is not null, we are here after takeover */
368 if (mddev->private == NULL) {
369 ret = create_strip_zones(mddev, &conf);
370 if (ret < 0)
371 return ret;
372 mddev->private = conf;
373 }
374 conf = mddev->private;
375 if (mddev->queue) {
376 struct md_rdev *rdev;
377 bool discard_supported = false;
378
379 blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
380 blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
381 blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
382
383 blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
384 blk_queue_io_opt(mddev->queue,
385 (mddev->chunk_sectors << 9) * mddev->raid_disks);
386
387 rdev_for_each(rdev, mddev) {
388 disk_stack_limits(mddev->gendisk, rdev->bdev,
389 rdev->data_offset << 9);
390 if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
391 discard_supported = true;
392 }
393 if (!discard_supported)
394 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
395 else
396 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
397 }
398
399 /* calculate array device size */
400 md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
401
402 pr_debug("md/raid0:%s: md_size is %llu sectors.\n",
403 mdname(mddev),
404 (unsigned long long)mddev->array_sectors);
405
406 if (mddev->queue) {
407 /* calculate the max read-ahead size.
408 * For read-ahead of large files to be effective, we need to
409 * readahead at least twice a whole stripe. i.e. number of devices
410 * multiplied by chunk size times 2.
411 * If an individual device has an ra_pages greater than the
412 * chunk size, then we will not drive that device as hard as it
413 * wants. We consider this a configuration error: a larger
414 * chunksize should be used in that case.
415 */
416 int stripe = mddev->raid_disks *
417 (mddev->chunk_sectors << 9) / PAGE_SIZE;
418 if (mddev->queue->backing_dev_info.ra_pages < 2* stripe)
419 mddev->queue->backing_dev_info.ra_pages = 2* stripe;
420 }
421
422 dump_zones(mddev);
423
424 ret = md_integrity_register(mddev);
425
426 return ret;
427 }
428
429 static void raid0_free(struct mddev *mddev, void *priv)
430 {
431 struct r0conf *conf = priv;
432
433 kfree(conf->strip_zone);
434 kfree(conf->devlist);
435 kfree(conf);
436 }
437
438 /*
439 * Is io distribute over 1 or more chunks ?
440 */
441 static inline int is_io_in_chunk_boundary(struct mddev *mddev,
442 unsigned int chunk_sects, struct bio *bio)
443 {
444 if (likely(is_power_of_2(chunk_sects))) {
445 return chunk_sects >=
446 ((bio->bi_iter.bi_sector & (chunk_sects-1))
447 + bio_sectors(bio));
448 } else{
449 sector_t sector = bio->bi_iter.bi_sector;
450 return chunk_sects >= (sector_div(sector, chunk_sects)
451 + bio_sectors(bio));
452 }
453 }
454
455 static void raid0_make_request(struct mddev *mddev, struct bio *bio)
456 {
457 struct strip_zone *zone;
458 struct md_rdev *tmp_dev;
459 struct bio *split;
460
461 if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
462 md_flush_request(mddev, bio);
463 return;
464 }
465
466 do {
467 sector_t bio_sector = bio->bi_iter.bi_sector;
468 sector_t sector = bio_sector;
469 unsigned chunk_sects = mddev->chunk_sectors;
470
471 unsigned sectors = chunk_sects -
472 (likely(is_power_of_2(chunk_sects))
473 ? (sector & (chunk_sects-1))
474 : sector_div(sector, chunk_sects));
475
476 /* Restore due to sector_div */
477 sector = bio_sector;
478
479 if (sectors < bio_sectors(bio)) {
480 split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set);
481 bio_chain(split, bio);
482 } else {
483 split = bio;
484 }
485
486 zone = find_zone(mddev->private, &sector);
487 tmp_dev = map_sector(mddev, zone, sector, &sector);
488 split->bi_bdev = tmp_dev->bdev;
489 split->bi_iter.bi_sector = sector + zone->dev_start +
490 tmp_dev->data_offset;
491
492 if (unlikely((bio_op(split) == REQ_OP_DISCARD) &&
493 !blk_queue_discard(bdev_get_queue(split->bi_bdev)))) {
494 /* Just ignore it */
495 bio_endio(split);
496 } else {
497 if (mddev->gendisk)
498 trace_block_bio_remap(bdev_get_queue(split->bi_bdev),
499 split, disk_devt(mddev->gendisk),
500 bio_sector);
501 generic_make_request(split);
502 }
503 } while (split != bio);
504 }
505
506 static void raid0_status(struct seq_file *seq, struct mddev *mddev)
507 {
508 seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2);
509 return;
510 }
511
512 static void *raid0_takeover_raid45(struct mddev *mddev)
513 {
514 struct md_rdev *rdev;
515 struct r0conf *priv_conf;
516
517 if (mddev->degraded != 1) {
518 pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n",
519 mdname(mddev),
520 mddev->degraded);
521 return ERR_PTR(-EINVAL);
522 }
523
524 rdev_for_each(rdev, mddev) {
525 /* check slot number for a disk */
526 if (rdev->raid_disk == mddev->raid_disks-1) {
527 pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n",
528 mdname(mddev));
529 return ERR_PTR(-EINVAL);
530 }
531 rdev->sectors = mddev->dev_sectors;
532 }
533
534 /* Set new parameters */
535 mddev->new_level = 0;
536 mddev->new_layout = 0;
537 mddev->new_chunk_sectors = mddev->chunk_sectors;
538 mddev->raid_disks--;
539 mddev->delta_disks = -1;
540 /* make sure it will be not marked as dirty */
541 mddev->recovery_cp = MaxSector;
542 clear_bit(MD_HAS_JOURNAL, &mddev->flags);
543 clear_bit(MD_JOURNAL_CLEAN, &mddev->flags);
544
545 create_strip_zones(mddev, &priv_conf);
546
547 return priv_conf;
548 }
549
550 static void *raid0_takeover_raid10(struct mddev *mddev)
551 {
552 struct r0conf *priv_conf;
553
554 /* Check layout:
555 * - far_copies must be 1
556 * - near_copies must be 2
557 * - disks number must be even
558 * - all mirrors must be already degraded
559 */
560 if (mddev->layout != ((1 << 8) + 2)) {
561 pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n",
562 mdname(mddev),
563 mddev->layout);
564 return ERR_PTR(-EINVAL);
565 }
566 if (mddev->raid_disks & 1) {
567 pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n",
568 mdname(mddev));
569 return ERR_PTR(-EINVAL);
570 }
571 if (mddev->degraded != (mddev->raid_disks>>1)) {
572 pr_warn("md/raid0:%s: All mirrors must be already degraded!\n",
573 mdname(mddev));
574 return ERR_PTR(-EINVAL);
575 }
576
577 /* Set new parameters */
578 mddev->new_level = 0;
579 mddev->new_layout = 0;
580 mddev->new_chunk_sectors = mddev->chunk_sectors;
581 mddev->delta_disks = - mddev->raid_disks / 2;
582 mddev->raid_disks += mddev->delta_disks;
583 mddev->degraded = 0;
584 /* make sure it will be not marked as dirty */
585 mddev->recovery_cp = MaxSector;
586 clear_bit(MD_FAILFAST_SUPPORTED, &mddev->flags);
587
588 create_strip_zones(mddev, &priv_conf);
589 return priv_conf;
590 }
591
592 static void *raid0_takeover_raid1(struct mddev *mddev)
593 {
594 struct r0conf *priv_conf;
595 int chunksect;
596
597 /* Check layout:
598 * - (N - 1) mirror drives must be already faulty
599 */
600 if ((mddev->raid_disks - 1) != mddev->degraded) {
601 pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n",
602 mdname(mddev));
603 return ERR_PTR(-EINVAL);
604 }
605
606 /*
607 * a raid1 doesn't have the notion of chunk size, so
608 * figure out the largest suitable size we can use.
609 */
610 chunksect = 64 * 2; /* 64K by default */
611
612 /* The array must be an exact multiple of chunksize */
613 while (chunksect && (mddev->array_sectors & (chunksect - 1)))
614 chunksect >>= 1;
615
616 if ((chunksect << 9) < PAGE_SIZE)
617 /* array size does not allow a suitable chunk size */
618 return ERR_PTR(-EINVAL);
619
620 /* Set new parameters */
621 mddev->new_level = 0;
622 mddev->new_layout = 0;
623 mddev->new_chunk_sectors = chunksect;
624 mddev->chunk_sectors = chunksect;
625 mddev->delta_disks = 1 - mddev->raid_disks;
626 mddev->raid_disks = 1;
627 /* make sure it will be not marked as dirty */
628 mddev->recovery_cp = MaxSector;
629 clear_bit(MD_FAILFAST_SUPPORTED, &mddev->flags);
630
631 create_strip_zones(mddev, &priv_conf);
632 return priv_conf;
633 }
634
635 static void *raid0_takeover(struct mddev *mddev)
636 {
637 /* raid0 can take over:
638 * raid4 - if all data disks are active.
639 * raid5 - providing it is Raid4 layout and one disk is faulty
640 * raid10 - assuming we have all necessary active disks
641 * raid1 - with (N -1) mirror drives faulty
642 */
643
644 if (mddev->bitmap) {
645 pr_warn("md/raid0: %s: cannot takeover array with bitmap\n",
646 mdname(mddev));
647 return ERR_PTR(-EBUSY);
648 }
649 if (mddev->level == 4)
650 return raid0_takeover_raid45(mddev);
651
652 if (mddev->level == 5) {
653 if (mddev->layout == ALGORITHM_PARITY_N)
654 return raid0_takeover_raid45(mddev);
655
656 pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",
657 mdname(mddev), ALGORITHM_PARITY_N);
658 }
659
660 if (mddev->level == 10)
661 return raid0_takeover_raid10(mddev);
662
663 if (mddev->level == 1)
664 return raid0_takeover_raid1(mddev);
665
666 pr_warn("Takeover from raid%i to raid0 not supported\n",
667 mddev->level);
668
669 return ERR_PTR(-EINVAL);
670 }
671
672 static void raid0_quiesce(struct mddev *mddev, int state)
673 {
674 }
675
676 static struct md_personality raid0_personality=
677 {
678 .name = "raid0",
679 .level = 0,
680 .owner = THIS_MODULE,
681 .make_request = raid0_make_request,
682 .run = raid0_run,
683 .free = raid0_free,
684 .status = raid0_status,
685 .size = raid0_size,
686 .takeover = raid0_takeover,
687 .quiesce = raid0_quiesce,
688 .congested = raid0_congested,
689 };
690
691 static int __init raid0_init (void)
692 {
693 return register_md_personality (&raid0_personality);
694 }
695
696 static void raid0_exit (void)
697 {
698 unregister_md_personality (&raid0_personality);
699 }
700
701 module_init(raid0_init);
702 module_exit(raid0_exit);
703 MODULE_LICENSE("GPL");
704 MODULE_DESCRIPTION("RAID0 (striping) personality for MD");
705 MODULE_ALIAS("md-personality-2"); /* RAID0 */
706 MODULE_ALIAS("md-raid0");
707 MODULE_ALIAS("md-level-0");
Linux with added FPC-III support