blob: c89cde86d400b409dee677184635ef4b77041fcc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
3 *
4 * This file is released under the GPL.
5 */
6
Mikulas Patocka586e80e2008-10-21 17:44:59 +01007#include <linux/device-mapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/blkdev.h>
12#include <linux/bio.h>
13#include <linux/slab.h>
vignesh babu6f3c3f02007-10-19 22:38:44 +010014#include <linux/log2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Alasdair G Kergon72d94862006-06-26 00:27:35 -070016#define DM_MSG_PREFIX "striped"
Brian Wooda25eb942008-02-08 02:11:22 +000017#define DM_IO_ERROR_THRESHOLD 15
Alasdair G Kergon72d94862006-06-26 00:27:35 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019struct stripe {
20 struct dm_dev *dev;
21 sector_t physical_start;
Brian Wooda25eb942008-02-08 02:11:22 +000022
23 atomic_t error_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024};
25
26struct stripe_c {
27 uint32_t stripes;
Mikulas Patockac96053b2010-08-12 04:14:21 +010028 int stripes_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30 /* The size of this target / num. stripes */
31 sector_t stripe_width;
32
Mike Snitzereb850de2012-07-27 15:08:01 +010033 uint32_t chunk_size;
Mikulas Patocka33d07c02012-07-27 15:08:02 +010034 int chunk_size_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Brian Wooda25eb942008-02-08 02:11:22 +000036 /* Needed for handling events */
37 struct dm_target *ti;
38
39 /* Work struct used for triggering events*/
Tejun Heof521f072011-01-13 19:59:57 +000040 struct work_struct trigger_event;
Brian Wooda25eb942008-02-08 02:11:22 +000041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 struct stripe stripe[0];
43};
44
Brian Wooda25eb942008-02-08 02:11:22 +000045/*
46 * An event is triggered whenever a drive
47 * drops out of a stripe volume.
48 */
49static void trigger_event(struct work_struct *work)
50{
Tejun Heof521f072011-01-13 19:59:57 +000051 struct stripe_c *sc = container_of(work, struct stripe_c,
52 trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +000053 dm_table_event(sc->ti->table);
Brian Wooda25eb942008-02-08 02:11:22 +000054}
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static inline struct stripe_c *alloc_context(unsigned int stripes)
57{
58 size_t len;
59
Mikulas Patockad63a5ce2008-10-21 17:44:57 +010060 if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe),
61 stripes))
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 return NULL;
63
64 len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes);
65
66 return kmalloc(len, GFP_KERNEL);
67}
68
69/*
70 * Parse a single <dev> <sector> pair
71 */
72static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
73 unsigned int stripe, char **argv)
74{
Andrew Morton4ee218c2006-03-27 01:17:48 -080075 unsigned long long start;
Mikulas Patocka31998ef2012-03-28 18:41:26 +010076 char dummy;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Mikulas Patocka31998ef2012-03-28 18:41:26 +010078 if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 return -EINVAL;
80
Nikanth Karthikesan8215d6e2010-03-06 02:32:27 +000081 if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 &sc->stripe[stripe].dev))
83 return -ENXIO;
84
85 sc->stripe[stripe].physical_start = start;
Brian Wooda25eb942008-02-08 02:11:22 +000086
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 return 0;
88}
89
90/*
91 * Construct a striped mapping.
Mike Snitzereb850de2012-07-27 15:08:01 +010092 * <number of stripes> <chunk size> [<dev_path> <offset>]+
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 */
94static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
95{
96 struct stripe_c *sc;
97 sector_t width;
98 uint32_t stripes;
99 uint32_t chunk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 int r;
101 unsigned int i;
102
103 if (argc < 2) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700104 ti->error = "Not enough arguments";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return -EINVAL;
106 }
107
majianpeng1a66a082012-07-27 15:07:59 +0100108 if (kstrtouint(argv[0], 10, &stripes) || !stripes) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700109 ti->error = "Invalid stripe count";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 return -EINVAL;
111 }
112
Mikulas Patocka8f069b42012-07-27 15:08:01 +0100113 if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700114 ti->error = "Invalid chunk_size";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return -EINVAL;
116 }
117
Mike Snitzereb850de2012-07-27 15:08:01 +0100118 width = ti->len;
119 if (sector_div(width, chunk_size)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700120 ti->error = "Target length not divisible by "
Kevin Corry8ba32fd2006-03-16 23:04:03 -0800121 "chunk size";
122 return -EINVAL;
123 }
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 if (sector_div(width, stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700126 ti->error = "Target length not divisible by "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 "number of stripes";
128 return -EINVAL;
129 }
130
131 /*
132 * Do we have enough arguments for that many stripes ?
133 */
134 if (argc != (2 + 2 * stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700135 ti->error = "Not enough destinations "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 "specified";
137 return -EINVAL;
138 }
139
140 sc = alloc_context(stripes);
141 if (!sc) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700142 ti->error = "Memory allocation for striped context "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 "failed";
144 return -ENOMEM;
145 }
146
Tejun Heof521f072011-01-13 19:59:57 +0000147 INIT_WORK(&sc->trigger_event, trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000148
149 /* Set pointer to dm target; used in trigger_event */
150 sc->ti = ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 sc->stripes = stripes;
152 sc->stripe_width = width;
Mikulas Patockac96053b2010-08-12 04:14:21 +0100153
154 if (stripes & (stripes - 1))
155 sc->stripes_shift = -1;
Mikulas Patocka1df05482012-07-27 15:08:00 +0100156 else
157 sc->stripes_shift = __ffs(stripes);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100158
Mike Snitzer542f9032012-07-27 15:08:00 +0100159 r = dm_set_target_max_io_len(ti, chunk_size);
160 if (r)
161 return r;
162
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100163 ti->num_flush_requests = stripes;
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100164 ti->num_discard_requests = stripes;
Mike Snitzer45e621d2012-12-21 20:23:41 +0000165 ti->num_write_same_requests = stripes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Mike Snitzereb850de2012-07-27 15:08:01 +0100167 sc->chunk_size = chunk_size;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100168 if (chunk_size & (chunk_size - 1))
169 sc->chunk_size_shift = -1;
170 else
171 sc->chunk_size_shift = __ffs(chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 /*
174 * Get the stripe destinations.
175 */
176 for (i = 0; i < stripes; i++) {
177 argv += 2;
178
179 r = get_stripe(ti, sc, i, argv);
180 if (r < 0) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700181 ti->error = "Couldn't parse stripe destination";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 while (i--)
183 dm_put_device(ti, sc->stripe[i].dev);
184 kfree(sc);
185 return r;
186 }
Brian Wooda25eb942008-02-08 02:11:22 +0000187 atomic_set(&(sc->stripe[i].error_count), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189
190 ti->private = sc;
Brian Wooda25eb942008-02-08 02:11:22 +0000191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return 0;
193}
194
195static void stripe_dtr(struct dm_target *ti)
196{
197 unsigned int i;
198 struct stripe_c *sc = (struct stripe_c *) ti->private;
199
200 for (i = 0; i < sc->stripes; i++)
201 dm_put_device(ti, sc->stripe[i].dev);
202
Tejun Heo43829732012-08-20 14:51:24 -0700203 flush_work(&sc->trigger_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 kfree(sc);
205}
206
Mikulas Patocka65988522010-08-12 04:14:14 +0100207static void stripe_map_sector(struct stripe_c *sc, sector_t sector,
208 uint32_t *stripe, sector_t *result)
209{
Mike Snitzereb850de2012-07-27 15:08:01 +0100210 sector_t chunk = dm_target_offset(sc->ti, sector);
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100211 sector_t chunk_offset;
212
213 if (sc->chunk_size_shift < 0)
214 chunk_offset = sector_div(chunk, sc->chunk_size);
215 else {
216 chunk_offset = chunk & (sc->chunk_size - 1);
217 chunk >>= sc->chunk_size_shift;
218 }
Mikulas Patocka65988522010-08-12 04:14:14 +0100219
Mikulas Patockac96053b2010-08-12 04:14:21 +0100220 if (sc->stripes_shift < 0)
221 *stripe = sector_div(chunk, sc->stripes);
222 else {
Mikulas Patocka1df05482012-07-27 15:08:00 +0100223 *stripe = chunk & (sc->stripes - 1);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100224 chunk >>= sc->stripes_shift;
225 }
226
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100227 if (sc->chunk_size_shift < 0)
228 chunk *= sc->chunk_size;
229 else
230 chunk <<= sc->chunk_size_shift;
231
232 *result = chunk + chunk_offset;
Mikulas Patocka65988522010-08-12 04:14:14 +0100233}
234
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100235static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector,
236 uint32_t target_stripe, sector_t *result)
237{
238 uint32_t stripe;
239
240 stripe_map_sector(sc, sector, &stripe, result);
241 if (stripe == target_stripe)
242 return;
Mike Snitzereb850de2012-07-27 15:08:01 +0100243
244 /* round down */
245 sector = *result;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100246 if (sc->chunk_size_shift < 0)
247 *result -= sector_div(sector, sc->chunk_size);
248 else
249 *result = sector & ~(sector_t)(sc->chunk_size - 1);
Mike Snitzereb850de2012-07-27 15:08:01 +0100250
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100251 if (target_stripe < stripe)
Mike Snitzereb850de2012-07-27 15:08:01 +0100252 *result += sc->chunk_size; /* next chunk */
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100253}
254
Mike Snitzer45e621d2012-12-21 20:23:41 +0000255static int stripe_map_range(struct stripe_c *sc, struct bio *bio,
256 uint32_t target_stripe)
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100257{
258 sector_t begin, end;
259
260 stripe_map_range_sector(sc, bio->bi_sector, target_stripe, &begin);
261 stripe_map_range_sector(sc, bio->bi_sector + bio_sectors(bio),
262 target_stripe, &end);
263 if (begin < end) {
264 bio->bi_bdev = sc->stripe[target_stripe].dev->bdev;
265 bio->bi_sector = begin + sc->stripe[target_stripe].physical_start;
266 bio->bi_size = to_bytes(end - begin);
267 return DM_MAPIO_REMAPPED;
268 } else {
269 /* The range doesn't map to the target stripe */
270 bio_endio(bio, 0);
271 return DM_MAPIO_SUBMITTED;
272 }
273}
274
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000275static int stripe_map(struct dm_target *ti, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Mikulas Patocka65988522010-08-12 04:14:14 +0100277 struct stripe_c *sc = ti->private;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100278 uint32_t stripe;
Mike Snitzer57cba5d2010-08-12 04:14:04 +0100279 unsigned target_request_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Tejun Heod87f4c12010-09-03 11:56:19 +0200281 if (bio->bi_rw & REQ_FLUSH) {
Mikulas Patockaddbd6582012-12-21 20:23:39 +0000282 target_request_nr = dm_bio_get_target_request_nr(bio);
Mike Snitzer57cba5d2010-08-12 04:14:04 +0100283 BUG_ON(target_request_nr >= sc->stripes);
284 bio->bi_bdev = sc->stripe[target_request_nr].dev->bdev;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100285 return DM_MAPIO_REMAPPED;
286 }
Mike Snitzer45e621d2012-12-21 20:23:41 +0000287 if (unlikely(bio->bi_rw & REQ_DISCARD) ||
288 unlikely(bio->bi_rw & REQ_WRITE_SAME)) {
Mikulas Patockaddbd6582012-12-21 20:23:39 +0000289 target_request_nr = dm_bio_get_target_request_nr(bio);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100290 BUG_ON(target_request_nr >= sc->stripes);
Mike Snitzer45e621d2012-12-21 20:23:41 +0000291 return stripe_map_range(sc, bio, target_request_nr);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100292 }
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100293
Mikulas Patocka65988522010-08-12 04:14:14 +0100294 stripe_map_sector(sc, bio->bi_sector, &stripe, &bio->bi_sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Mikulas Patocka65988522010-08-12 04:14:14 +0100296 bio->bi_sector += sc->stripe[stripe].physical_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 bio->bi_bdev = sc->stripe[stripe].dev->bdev;
Mikulas Patocka65988522010-08-12 04:14:14 +0100298
Kiyoshi Uedad2a7ad22006-12-08 02:41:06 -0800299 return DM_MAPIO_REMAPPED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
Brian Wood4f7f5c62008-02-08 02:11:24 +0000302/*
303 * Stripe status:
304 *
305 * INFO
306 * #stripes [stripe_name <stripe_name>] [group word count]
307 * [error count 'A|D' <error count 'A|D'>]
308 *
309 * TABLE
310 * #stripes [stripe chunk size]
311 * [stripe_name physical_start <stripe_name physical_start>]
312 *
313 */
314
Alasdair G Kergon1f4e0ff2012-07-27 15:08:16 +0100315static int stripe_status(struct dm_target *ti, status_type_t type,
316 unsigned status_flags, char *result, unsigned maxlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
318 struct stripe_c *sc = (struct stripe_c *) ti->private;
Brian Wood4f7f5c62008-02-08 02:11:24 +0000319 char buffer[sc->stripes + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 unsigned int sz = 0;
321 unsigned int i;
322
323 switch (type) {
324 case STATUSTYPE_INFO:
Brian Wood4f7f5c62008-02-08 02:11:24 +0000325 DMEMIT("%d ", sc->stripes);
326 for (i = 0; i < sc->stripes; i++) {
327 DMEMIT("%s ", sc->stripe[i].dev->name);
328 buffer[i] = atomic_read(&(sc->stripe[i].error_count)) ?
329 'D' : 'A';
330 }
331 buffer[i] = '\0';
332 DMEMIT("1 %s", buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 break;
334
335 case STATUSTYPE_TABLE:
Andrew Morton4ee218c2006-03-27 01:17:48 -0800336 DMEMIT("%d %llu", sc->stripes,
Mike Snitzereb850de2012-07-27 15:08:01 +0100337 (unsigned long long)sc->chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 for (i = 0; i < sc->stripes; i++)
Andrew Morton4ee218c2006-03-27 01:17:48 -0800339 DMEMIT(" %s %llu", sc->stripe[i].dev->name,
340 (unsigned long long)sc->stripe[i].physical_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 break;
342 }
343 return 0;
344}
345
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000346static int stripe_end_io(struct dm_target *ti, struct bio *bio, int error)
Brian Wooda25eb942008-02-08 02:11:22 +0000347{
348 unsigned i;
349 char major_minor[16];
350 struct stripe_c *sc = ti->private;
351
352 if (!error)
353 return 0; /* I/O complete */
354
Christoph Hellwig7b6d91d2010-08-07 18:20:39 +0200355 if ((error == -EWOULDBLOCK) && (bio->bi_rw & REQ_RAHEAD))
Brian Wooda25eb942008-02-08 02:11:22 +0000356 return error;
357
358 if (error == -EOPNOTSUPP)
359 return error;
360
361 memset(major_minor, 0, sizeof(major_minor));
362 sprintf(major_minor, "%d:%d",
Tejun Heof331c022008-09-03 09:01:48 +0200363 MAJOR(disk_devt(bio->bi_bdev->bd_disk)),
364 MINOR(disk_devt(bio->bi_bdev->bd_disk)));
Brian Wooda25eb942008-02-08 02:11:22 +0000365
366 /*
367 * Test to see which stripe drive triggered the event
368 * and increment error count for all stripes on that device.
369 * If the error count for a given device exceeds the threshold
370 * value we will no longer trigger any further events.
371 */
372 for (i = 0; i < sc->stripes; i++)
373 if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
374 atomic_inc(&(sc->stripe[i].error_count));
375 if (atomic_read(&(sc->stripe[i].error_count)) <
376 DM_IO_ERROR_THRESHOLD)
Tejun Heof521f072011-01-13 19:59:57 +0000377 schedule_work(&sc->trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000378 }
379
380 return error;
381}
382
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100383static int stripe_iterate_devices(struct dm_target *ti,
384 iterate_devices_callout_fn fn, void *data)
385{
386 struct stripe_c *sc = ti->private;
387 int ret = 0;
388 unsigned i = 0;
389
Mike Snitzer5dea2712009-07-23 20:30:42 +0100390 do {
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100391 ret = fn(ti, sc->stripe[i].dev,
Mike Snitzer5dea2712009-07-23 20:30:42 +0100392 sc->stripe[i].physical_start,
393 sc->stripe_width, data);
394 } while (!ret && ++i < sc->stripes);
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100395
396 return ret;
397}
398
Mike Snitzer40bea432009-09-04 20:40:25 +0100399static void stripe_io_hints(struct dm_target *ti,
400 struct queue_limits *limits)
401{
402 struct stripe_c *sc = ti->private;
Mike Snitzereb850de2012-07-27 15:08:01 +0100403 unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT;
Mike Snitzer40bea432009-09-04 20:40:25 +0100404
405 blk_limits_io_min(limits, chunk_size);
Martin K. Petersen3c5820c2009-09-11 21:54:52 +0200406 blk_limits_io_opt(limits, chunk_size * sc->stripes);
Mike Snitzer40bea432009-09-04 20:40:25 +0100407}
408
Mustafa Mesanovic29915202011-03-24 13:54:35 +0000409static int stripe_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
410 struct bio_vec *biovec, int max_size)
411{
412 struct stripe_c *sc = ti->private;
413 sector_t bvm_sector = bvm->bi_sector;
414 uint32_t stripe;
415 struct request_queue *q;
416
417 stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector);
418
419 q = bdev_get_queue(sc->stripe[stripe].dev->bdev);
420 if (!q->merge_bvec_fn)
421 return max_size;
422
423 bvm->bi_bdev = sc->stripe[stripe].dev->bdev;
424 bvm->bi_sector = sc->stripe[stripe].physical_start + bvm_sector;
425
426 return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
427}
428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429static struct target_type stripe_target = {
430 .name = "striped",
Mike Snitzereb850de2012-07-27 15:08:01 +0100431 .version = {1, 5, 0},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 .module = THIS_MODULE,
433 .ctr = stripe_ctr,
434 .dtr = stripe_dtr,
435 .map = stripe_map,
Brian Wooda25eb942008-02-08 02:11:22 +0000436 .end_io = stripe_end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 .status = stripe_status,
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100438 .iterate_devices = stripe_iterate_devices,
Mike Snitzer40bea432009-09-04 20:40:25 +0100439 .io_hints = stripe_io_hints,
Mustafa Mesanovic29915202011-03-24 13:54:35 +0000440 .merge = stripe_merge,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441};
442
443int __init dm_stripe_init(void)
444{
445 int r;
446
447 r = dm_register_target(&stripe_target);
Heinz Mauelshagen6edebde2008-11-13 23:38:56 +0000448 if (r < 0) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700449 DMWARN("target registration failed");
Heinz Mauelshagen6edebde2008-11-13 23:38:56 +0000450 return r;
451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
453 return r;
454}
455
456void dm_stripe_exit(void)
457{
Mikulas Patocka10d3bd02009-01-06 03:04:58 +0000458 dm_unregister_target(&stripe_target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}