blob: 21014836bdbf2286eba4fd02effbc4efcd9db625 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 linear.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
7 Linear mode management functions.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
13
14 You should have received a copy of the GNU General Public License
15 (for example /usr/src/linux/COPYING); if not, write to the Free
16 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17*/
18
NeilBrownbff61972009-03-31 14:33:13 +110019#include <linux/blkdev.h>
20#include <linux/raid/md_u.h>
NeilBrownbff61972009-03-31 14:33:13 +110021#include <linux/seq_file.h>
Paul Gortmaker056075c2011-07-03 13:58:33 -040022#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
NeilBrown43b2e5d2009-03-31 14:33:13 +110024#include "md.h"
Christoph Hellwigef740c32009-03-31 14:27:03 +110025#include "linear.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Linus Torvalds1da177e2005-04-16 15:20:36 -070027/*
28 * find which device holds a particular offset
29 */
NeilBrowna7120772011-10-11 16:48:49 +110030static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Sandeep K Sinhaaece3d12009-06-16 16:57:08 +100032 int lo, mid, hi;
NeilBrowne849b932011-10-11 16:48:54 +110033 struct linear_conf *conf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Sandeep K Sinhaaece3d12009-06-16 16:57:08 +100035 lo = 0;
36 hi = mddev->raid_disks - 1;
SandeepKsinhaaf11c392009-06-18 08:49:35 +100037 conf = rcu_dereference(mddev->private);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Sandeep K Sinhaaece3d12009-06-16 16:57:08 +100039 /*
40 * Binary Search
41 */
42
43 while (hi > lo) {
44
45 mid = (hi + lo) / 2;
46 if (sector < conf->disks[mid].end_sector)
47 hi = mid;
48 else
49 lo = mid + 1;
50 }
51
52 return conf->disks + lo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
55/**
NeilBrown15945fe2005-09-09 16:23:47 -070056 * linear_mergeable_bvec -- tell bio layer if two requests can be merged
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 * @q: request queue
Alasdair G Kergoncc371e62008-07-03 09:53:43 +020058 * @bvm: properties of new bio
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 * @biovec: the request that could be merged to it.
60 *
61 * Return amount of bytes we can take at this offset
62 */
Alasdair G Kergoncc371e62008-07-03 09:53:43 +020063static int linear_mergeable_bvec(struct request_queue *q,
64 struct bvec_merge_data *bvm,
65 struct bio_vec *biovec)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
NeilBrownfd01b882011-10-11 16:47:53 +110067 struct mddev *mddev = q->queuedata;
NeilBrowna7120772011-10-11 16:48:49 +110068 struct dev_info *dev0;
Alasdair G Kergoncc371e62008-07-03 09:53:43 +020069 unsigned long maxsectors, bio_sectors = bvm->bi_size >> 9;
70 sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev);
NeilBrownba13da42012-03-19 12:46:39 +110071 int maxbytes = biovec->bv_len;
72 struct request_queue *subq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
SandeepKsinhaaf11c392009-06-18 08:49:35 +100074 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 dev0 = which_dev(mddev, sector);
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +100076 maxsectors = dev0->end_sector - sector;
NeilBrownba13da42012-03-19 12:46:39 +110077 subq = bdev_get_queue(dev0->rdev->bdev);
78 if (subq->merge_bvec_fn) {
79 bvm->bi_bdev = dev0->rdev->bdev;
80 bvm->bi_sector -= dev0->end_sector - dev0->rdev->sectors;
81 maxbytes = min(maxbytes, subq->merge_bvec_fn(subq, bvm,
82 biovec));
83 }
SandeepKsinhaaf11c392009-06-18 08:49:35 +100084 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 if (maxsectors < bio_sectors)
87 maxsectors = 0;
88 else
89 maxsectors -= bio_sectors;
90
91 if (maxsectors <= (PAGE_SIZE >> 9 ) && bio_sectors == 0)
NeilBrownba13da42012-03-19 12:46:39 +110092 return maxbytes;
93
94 if (maxsectors > (maxbytes >> 9))
95 return maxbytes;
96 else
97 return maxsectors << 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
NeilBrown26be34d2006-10-03 01:15:53 -0700100static int linear_congested(void *data, int bits)
101{
NeilBrownfd01b882011-10-11 16:47:53 +1100102 struct mddev *mddev = data;
NeilBrowne849b932011-10-11 16:48:54 +1100103 struct linear_conf *conf;
NeilBrown26be34d2006-10-03 01:15:53 -0700104 int i, ret = 0;
105
NeilBrown3fa841d2009-09-23 18:10:29 +1000106 if (mddev_congested(mddev, bits))
107 return 1;
108
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000109 rcu_read_lock();
110 conf = rcu_dereference(mddev->private);
111
NeilBrown26be34d2006-10-03 01:15:53 -0700112 for (i = 0; i < mddev->raid_disks && !ret ; i++) {
Jens Axboe165125e2007-07-24 09:28:11 +0200113 struct request_queue *q = bdev_get_queue(conf->disks[i].rdev->bdev);
NeilBrown26be34d2006-10-03 01:15:53 -0700114 ret |= bdi_congested(&q->backing_dev_info, bits);
115 }
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000116
117 rcu_read_unlock();
NeilBrown26be34d2006-10-03 01:15:53 -0700118 return ret;
119}
120
NeilBrownfd01b882011-10-11 16:47:53 +1100121static sector_t linear_size(struct mddev *mddev, sector_t sectors, int raid_disks)
Dan Williams80c3a6c2009-03-17 18:10:40 -0700122{
NeilBrowne849b932011-10-11 16:48:54 +1100123 struct linear_conf *conf;
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000124 sector_t array_sectors;
Dan Williams80c3a6c2009-03-17 18:10:40 -0700125
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000126 rcu_read_lock();
127 conf = rcu_dereference(mddev->private);
Dan Williams80c3a6c2009-03-17 18:10:40 -0700128 WARN_ONCE(sectors || raid_disks,
129 "%s does not support generic reshape\n", __func__);
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000130 array_sectors = conf->array_sectors;
131 rcu_read_unlock();
Dan Williams80c3a6c2009-03-17 18:10:40 -0700132
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000133 return array_sectors;
Dan Williams80c3a6c2009-03-17 18:10:40 -0700134}
135
NeilBrowne849b932011-10-11 16:48:54 +1100136static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
NeilBrowne849b932011-10-11 16:48:54 +1100138 struct linear_conf *conf;
NeilBrown3cb03002011-10-11 16:45:26 +1100139 struct md_rdev *rdev;
Sandeep K Sinha45d45822009-06-16 16:55:26 +1000140 int i, cnt;
Shaohua Lif1cad2b2012-10-11 13:08:44 +1100141 bool discard_supported = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
NeilBrowna7120772011-10-11 16:48:49 +1100143 conf = kzalloc (sizeof (*conf) + raid_disks*sizeof(struct dev_info),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 GFP_KERNEL);
145 if (!conf)
NeilBrown7c7546c2006-06-26 00:27:41 -0700146 return NULL;
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 cnt = 0;
Andre Nolld6e22152008-07-21 17:05:25 +1000149 conf->array_sectors = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
NeilBrowndafb20f2012-03-19 12:46:39 +1100151 rdev_for_each(rdev, mddev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 int j = rdev->raid_disk;
NeilBrowna7120772011-10-11 16:48:49 +1100153 struct dev_info *disk = conf->disks + j;
NeilBrown13f26822009-06-18 08:48:55 +1000154 sector_t sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Nikanth Karthikesan13864512008-06-28 08:31:19 +1000156 if (j < 0 || j >= raid_disks || disk->rdev) {
NeilBrown2dc40f82010-05-03 15:12:04 +1000157 printk(KERN_ERR "md/linear:%s: disk numbering problem. Aborting!\n",
158 mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 goto out;
160 }
161
162 disk->rdev = rdev;
NeilBrown13f26822009-06-18 08:48:55 +1000163 if (mddev->chunk_sectors) {
164 sectors = rdev->sectors;
165 sector_div(sectors, mddev->chunk_sectors);
166 rdev->sectors = sectors * mddev->chunk_sectors;
167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Martin K. Petersen8f6c2e42009-07-01 11:13:45 +1000169 disk_stack_limits(mddev->gendisk, rdev->bdev,
170 rdev->data_offset << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Andre Nolldd8ac332009-03-31 14:33:13 +1100172 conf->array_sectors += rdev->sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 cnt++;
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000174
Shaohua Lif1cad2b2012-10-11 13:08:44 +1100175 if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
176 discard_supported = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
NeilBrown7c7546c2006-06-26 00:27:41 -0700178 if (cnt != raid_disks) {
NeilBrown2dc40f82010-05-03 15:12:04 +1000179 printk(KERN_ERR "md/linear:%s: not enough drives present. Aborting!\n",
180 mdname(mddev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 goto out;
182 }
183
Shaohua Lif1cad2b2012-10-11 13:08:44 +1100184 if (!discard_supported)
185 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
186 else
187 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 /*
Sandeep K Sinha45d45822009-06-16 16:55:26 +1000190 * Here we calculate the device offsets.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 */
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000192 conf->disks[0].end_sector = conf->disks[0].rdev->sectors;
193
NeilBrowna778b732007-05-23 13:58:10 -0700194 for (i = 1; i < raid_disks; i++)
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000195 conf->disks[i].end_sector =
196 conf->disks[i-1].end_sector +
197 conf->disks[i].rdev->sectors;
NeilBrown15945fe2005-09-09 16:23:47 -0700198
NeilBrown7c7546c2006-06-26 00:27:41 -0700199 return conf;
200
201out:
202 kfree(conf);
203 return NULL;
204}
205
NeilBrownfd01b882011-10-11 16:47:53 +1100206static int linear_run (struct mddev *mddev)
NeilBrown7c7546c2006-06-26 00:27:41 -0700207{
NeilBrowne849b932011-10-11 16:48:54 +1100208 struct linear_conf *conf;
majianpeng98d55612012-04-02 09:48:37 +1000209 int ret;
NeilBrown7c7546c2006-06-26 00:27:41 -0700210
Andre Noll0894cc32009-06-18 08:49:23 +1000211 if (md_check_no_bitmap(mddev))
212 return -EINVAL;
NeilBrown7c7546c2006-06-26 00:27:41 -0700213 conf = linear_conf(mddev, mddev->raid_disks);
214
215 if (!conf)
216 return 1;
217 mddev->private = conf;
Dan Williams1f403622009-03-31 14:59:03 +1100218 md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
NeilBrown7c7546c2006-06-26 00:27:41 -0700219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
NeilBrown26be34d2006-10-03 01:15:53 -0700221 mddev->queue->backing_dev_info.congested_fn = linear_congested;
222 mddev->queue->backing_dev_info.congested_data = mddev;
majianpeng98d55612012-04-02 09:48:37 +1000223
224 ret = md_integrity_register(mddev);
225 if (ret) {
226 kfree(conf);
227 mddev->private = NULL;
228 }
229 return ret;
NeilBrown7c7546c2006-06-26 00:27:41 -0700230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
NeilBrownfd01b882011-10-11 16:47:53 +1100232static int linear_add(struct mddev *mddev, struct md_rdev *rdev)
NeilBrown7c7546c2006-06-26 00:27:41 -0700233{
234 /* Adding a drive to a linear array allows the array to grow.
235 * It is permitted if the new drive has a matching superblock
236 * already on it, with raid_disk equal to raid_disks.
237 * It is achieved by creating a new linear_private_data structure
238 * and swapping it in in-place of the current one.
239 * The current one is never freed until the array is stopped.
240 * This avoids races.
241 */
NeilBrowne849b932011-10-11 16:48:54 +1100242 struct linear_conf *newconf, *oldconf;
NeilBrown7c7546c2006-06-26 00:27:41 -0700243
NeilBrowna778b732007-05-23 13:58:10 -0700244 if (rdev->saved_raid_disk != mddev->raid_disks)
NeilBrown7c7546c2006-06-26 00:27:41 -0700245 return -EINVAL;
246
NeilBrowna778b732007-05-23 13:58:10 -0700247 rdev->raid_disk = rdev->saved_raid_disk;
NeilBrown09cd9272011-12-23 09:56:55 +1100248 rdev->saved_raid_disk = -1;
NeilBrowna778b732007-05-23 13:58:10 -0700249
NeilBrown7c7546c2006-06-26 00:27:41 -0700250 newconf = linear_conf(mddev,mddev->raid_disks+1);
251
252 if (!newconf)
253 return -ENOMEM;
254
Denis Efremovbc78c572012-10-11 13:08:02 +1100255 oldconf = rcu_dereference_protected(mddev->private,
256 lockdep_is_held(
257 &mddev->reconfig_mutex));
NeilBrown7c7546c2006-06-26 00:27:41 -0700258 mddev->raid_disks++;
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000259 rcu_assign_pointer(mddev->private, newconf);
Dan Williams1f403622009-03-31 14:59:03 +1100260 md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
Andre Nollf233ea52008-07-21 17:05:22 +1000261 set_capacity(mddev->gendisk, mddev->array_sectors);
NeilBrown449aad32009-08-03 10:59:58 +1000262 revalidate_disk(mddev->gendisk);
Lai Jiangshanb119cba2011-03-18 11:59:14 +0800263 kfree_rcu(oldconf, rcu);
NeilBrown7c7546c2006-06-26 00:27:41 -0700264 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
NeilBrownfd01b882011-10-11 16:47:53 +1100267static int linear_stop (struct mddev *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Denis Efremovbc78c572012-10-11 13:08:02 +1100269 struct linear_conf *conf =
270 rcu_dereference_protected(mddev->private,
271 lockdep_is_held(
272 &mddev->reconfig_mutex));
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000273
274 /*
275 * We do not require rcu protection here since
276 * we hold reconfig_mutex for both linear_add and
277 * linear_stop, so they cannot race.
NeilBrown495d3572009-06-18 08:49:42 +1000278 * We should make sure any old 'conf's are properly
279 * freed though.
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000280 */
NeilBrown495d3572009-06-18 08:49:42 +1000281 rcu_barrier();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/
NeilBrown495d3572009-06-18 08:49:42 +1000283 kfree(conf);
NeilBrownef2f80f2010-05-17 11:27:00 +1000284 mddev->private = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 return 0;
287}
288
Linus Torvaldsb4fdcb02011-11-04 17:06:58 -0700289static void linear_make_request(struct mddev *mddev, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
NeilBrowna7120772011-10-11 16:48:49 +1100291 struct dev_info *tmp_dev;
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000292 sector_t start_sector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
Tejun Heoe9c74692010-09-03 11:56:18 +0200294 if (unlikely(bio->bi_rw & REQ_FLUSH)) {
295 md_flush_request(mddev, bio);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +0200296 return;
NeilBrowne5dcdd82005-09-09 16:23:41 -0700297 }
298
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000299 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 tmp_dev = which_dev(mddev, bio->bi_sector);
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000301 start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors;
302
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000303
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000304 if (unlikely(bio->bi_sector >= (tmp_dev->end_sector)
305 || (bio->bi_sector < start_sector))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 char b[BDEVNAME_SIZE];
307
NeilBrown2dc40f82010-05-03 15:12:04 +1000308 printk(KERN_ERR
309 "md/linear:%s: make_request: Sector %llu out of bounds on "
310 "dev %s: %llu sectors, offset %llu\n",
311 mdname(mddev),
312 (unsigned long long)bio->bi_sector,
313 bdevname(tmp_dev->rdev->bdev, b),
314 (unsigned long long)tmp_dev->rdev->sectors,
315 (unsigned long long)start_sector);
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000316 rcu_read_unlock();
NeilBrown6712ecf2007-09-27 12:47:43 +0200317 bio_io_error(bio);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +0200318 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320 if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000321 tmp_dev->end_sector)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 /* This bio crosses a device boundary, so we have to
323 * split it.
324 */
325 struct bio_pair *bp;
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000326 sector_t end_sector = tmp_dev->end_sector;
Andre Noll62838152008-10-13 11:55:12 +1100327
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000328 rcu_read_unlock();
329
330 bp = bio_split(bio, end_sector - bio->bi_sector);
Andre Noll62838152008-10-13 11:55:12 +1100331
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +0200332 linear_make_request(mddev, &bp->bio1);
333 linear_make_request(mddev, &bp->bio2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 bio_pair_release(bp);
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +0200335 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337
338 bio->bi_bdev = tmp_dev->rdev->bdev;
Sandeep K Sinha4db7cdc2009-06-16 16:56:13 +1000339 bio->bi_sector = bio->bi_sector - start_sector
Andre Noll62838152008-10-13 11:55:12 +1100340 + tmp_dev->rdev->data_offset;
SandeepKsinhaaf11c392009-06-18 08:49:35 +1000341 rcu_read_unlock();
Shaohua Lif1cad2b2012-10-11 13:08:44 +1100342
343 if (unlikely((bio->bi_rw & REQ_DISCARD) &&
344 !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) {
345 /* Just ignore it */
346 bio_endio(bio, 0);
347 return;
348 }
349
Christoph Hellwig5a7bbad2011-09-12 12:12:01 +0200350 generic_make_request(bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
NeilBrownfd01b882011-10-11 16:47:53 +1100353static void linear_status (struct seq_file *seq, struct mddev *mddev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
355
Andre Noll9d8f0362009-06-18 08:45:01 +1000356 seq_printf(seq, " %dk rounding", mddev->chunk_sectors / 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359
NeilBrown84fc4b52011-10-11 16:49:58 +1100360static struct md_personality linear_personality =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
362 .name = "linear",
NeilBrown2604b702006-01-06 00:20:36 -0800363 .level = LEVEL_LINEAR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 .owner = THIS_MODULE,
365 .make_request = linear_make_request,
366 .run = linear_run,
367 .stop = linear_stop,
368 .status = linear_status,
NeilBrown7c7546c2006-06-26 00:27:41 -0700369 .hot_add_disk = linear_add,
Dan Williams80c3a6c2009-03-17 18:10:40 -0700370 .size = linear_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371};
372
373static int __init linear_init (void)
374{
NeilBrown2604b702006-01-06 00:20:36 -0800375 return register_md_personality (&linear_personality);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378static void linear_exit (void)
379{
NeilBrown2604b702006-01-06 00:20:36 -0800380 unregister_md_personality (&linear_personality);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
383
384module_init(linear_init);
385module_exit(linear_exit);
386MODULE_LICENSE("GPL");
NeilBrown0efb9e62009-12-14 12:49:58 +1100387MODULE_DESCRIPTION("Linear device concatenation personality for MD");
NeilBrownd9d166c2006-01-06 00:20:51 -0800388MODULE_ALIAS("md-personality-1"); /* LINEAR - deprecated*/
389MODULE_ALIAS("md-linear");
NeilBrown2604b702006-01-06 00:20:36 -0800390MODULE_ALIAS("md-level--1");