blob: 797ddb900b062079cae7aca92b0b7bad2ead619f [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
Mike Snitzer7fff5e82013-09-06 11:36:01 -04007#include "dm.h"
Mikulas Patocka586e80e2008-10-21 17:44:59 +01008#include <linux/device-mapper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/blkdev.h>
13#include <linux/bio.h>
14#include <linux/slab.h>
vignesh babu6f3c3f02007-10-19 22:38:44 +010015#include <linux/log2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Alasdair G Kergon72d94862006-06-26 00:27:35 -070017#define DM_MSG_PREFIX "striped"
Brian Wooda25eb942008-02-08 02:11:22 +000018#define DM_IO_ERROR_THRESHOLD 15
Alasdair G Kergon72d94862006-06-26 00:27:35 -070019
Linus Torvalds1da177e2005-04-16 15:20:36 -070020struct stripe {
21 struct dm_dev *dev;
22 sector_t physical_start;
Brian Wooda25eb942008-02-08 02:11:22 +000023
24 atomic_t error_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025};
26
27struct stripe_c {
28 uint32_t stripes;
Mikulas Patockac96053b2010-08-12 04:14:21 +010029 int stripes_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31 /* The size of this target / num. stripes */
32 sector_t stripe_width;
33
Mike Snitzereb850de2012-07-27 15:08:01 +010034 uint32_t chunk_size;
Mikulas Patocka33d07c02012-07-27 15:08:02 +010035 int chunk_size_shift;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Brian Wooda25eb942008-02-08 02:11:22 +000037 /* Needed for handling events */
38 struct dm_target *ti;
39
40 /* Work struct used for triggering events*/
Tejun Heof521f072011-01-13 19:59:57 +000041 struct work_struct trigger_event;
Brian Wooda25eb942008-02-08 02:11:22 +000042
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct stripe stripe[0];
44};
45
Brian Wooda25eb942008-02-08 02:11:22 +000046/*
47 * An event is triggered whenever a drive
48 * drops out of a stripe volume.
49 */
50static void trigger_event(struct work_struct *work)
51{
Tejun Heof521f072011-01-13 19:59:57 +000052 struct stripe_c *sc = container_of(work, struct stripe_c,
53 trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +000054 dm_table_event(sc->ti->table);
Brian Wooda25eb942008-02-08 02:11:22 +000055}
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static inline struct stripe_c *alloc_context(unsigned int stripes)
58{
59 size_t len;
60
Mikulas Patockad63a5ce2008-10-21 17:44:57 +010061 if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe),
62 stripes))
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 return NULL;
64
65 len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes);
66
67 return kmalloc(len, GFP_KERNEL);
68}
69
70/*
71 * Parse a single <dev> <sector> pair
72 */
73static int get_stripe(struct dm_target *ti, struct stripe_c *sc,
74 unsigned int stripe, char **argv)
75{
Andrew Morton4ee218c2006-03-27 01:17:48 -080076 unsigned long long start;
Mikulas Patocka31998ef2012-03-28 18:41:26 +010077 char dummy;
Vivek Goyale80d1c82015-07-31 09:20:36 -040078 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Mikulas Patocka31998ef2012-03-28 18:41:26 +010080 if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return -EINVAL;
82
Vivek Goyale80d1c82015-07-31 09:20:36 -040083 ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
84 &sc->stripe[stripe].dev);
85 if (ret)
86 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 sc->stripe[stripe].physical_start = start;
Brian Wooda25eb942008-02-08 02:11:22 +000089
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return 0;
91}
92
93/*
94 * Construct a striped mapping.
Mike Snitzereb850de2012-07-27 15:08:01 +010095 * <number of stripes> <chunk size> [<dev_path> <offset>]+
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 */
97static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
98{
99 struct stripe_c *sc;
Mike Snitzerd793e6842013-05-10 14:37:14 +0100100 sector_t width, tmp_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 uint32_t stripes;
102 uint32_t chunk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 int r;
104 unsigned int i;
105
106 if (argc < 2) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700107 ti->error = "Not enough arguments";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return -EINVAL;
109 }
110
majianpeng1a66a082012-07-27 15:07:59 +0100111 if (kstrtouint(argv[0], 10, &stripes) || !stripes) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700112 ti->error = "Invalid stripe count";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return -EINVAL;
114 }
115
Mikulas Patocka8f069b42012-07-27 15:08:01 +0100116 if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700117 ti->error = "Invalid chunk_size";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return -EINVAL;
119 }
120
Mike Snitzereb850de2012-07-27 15:08:01 +0100121 width = ti->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 if (sector_div(width, stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700123 ti->error = "Target length not divisible by "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 "number of stripes";
125 return -EINVAL;
126 }
127
Mike Snitzerd793e6842013-05-10 14:37:14 +0100128 tmp_len = width;
129 if (sector_div(tmp_len, chunk_size)) {
130 ti->error = "Target length not divisible by "
131 "chunk size";
132 return -EINVAL;
133 }
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /*
136 * Do we have enough arguments for that many stripes ?
137 */
138 if (argc != (2 + 2 * stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700139 ti->error = "Not enough destinations "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 "specified";
141 return -EINVAL;
142 }
143
144 sc = alloc_context(stripes);
145 if (!sc) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700146 ti->error = "Memory allocation for striped context "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 "failed";
148 return -ENOMEM;
149 }
150
Tejun Heof521f072011-01-13 19:59:57 +0000151 INIT_WORK(&sc->trigger_event, trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000152
153 /* Set pointer to dm target; used in trigger_event */
154 sc->ti = ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 sc->stripes = stripes;
156 sc->stripe_width = width;
Mikulas Patockac96053b2010-08-12 04:14:21 +0100157
158 if (stripes & (stripes - 1))
159 sc->stripes_shift = -1;
Mikulas Patocka1df05482012-07-27 15:08:00 +0100160 else
161 sc->stripes_shift = __ffs(stripes);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100162
Mike Snitzer542f9032012-07-27 15:08:00 +0100163 r = dm_set_target_max_io_len(ti, chunk_size);
Pavitra Kumara3f2af22014-10-10 15:19:46 +0000164 if (r) {
165 kfree(sc);
Mike Snitzer542f9032012-07-27 15:08:00 +0100166 return r;
Pavitra Kumara3f2af22014-10-10 15:19:46 +0000167 }
Mike Snitzer542f9032012-07-27 15:08:00 +0100168
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000169 ti->num_flush_bios = stripes;
170 ti->num_discard_bios = stripes;
171 ti->num_write_same_bios = stripes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Mike Snitzereb850de2012-07-27 15:08:01 +0100173 sc->chunk_size = chunk_size;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100174 if (chunk_size & (chunk_size - 1))
175 sc->chunk_size_shift = -1;
176 else
177 sc->chunk_size_shift = __ffs(chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 /*
180 * Get the stripe destinations.
181 */
182 for (i = 0; i < stripes; i++) {
183 argv += 2;
184
185 r = get_stripe(ti, sc, i, argv);
186 if (r < 0) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700187 ti->error = "Couldn't parse stripe destination";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 while (i--)
189 dm_put_device(ti, sc->stripe[i].dev);
190 kfree(sc);
191 return r;
192 }
Brian Wooda25eb942008-02-08 02:11:22 +0000193 atomic_set(&(sc->stripe[i].error_count), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195
196 ti->private = sc;
Brian Wooda25eb942008-02-08 02:11:22 +0000197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return 0;
199}
200
201static void stripe_dtr(struct dm_target *ti)
202{
203 unsigned int i;
204 struct stripe_c *sc = (struct stripe_c *) ti->private;
205
206 for (i = 0; i < sc->stripes; i++)
207 dm_put_device(ti, sc->stripe[i].dev);
208
Tejun Heo43829732012-08-20 14:51:24 -0700209 flush_work(&sc->trigger_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 kfree(sc);
211}
212
Mikulas Patocka65988522010-08-12 04:14:14 +0100213static void stripe_map_sector(struct stripe_c *sc, sector_t sector,
214 uint32_t *stripe, sector_t *result)
215{
Mike Snitzereb850de2012-07-27 15:08:01 +0100216 sector_t chunk = dm_target_offset(sc->ti, sector);
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100217 sector_t chunk_offset;
218
219 if (sc->chunk_size_shift < 0)
220 chunk_offset = sector_div(chunk, sc->chunk_size);
221 else {
222 chunk_offset = chunk & (sc->chunk_size - 1);
223 chunk >>= sc->chunk_size_shift;
224 }
Mikulas Patocka65988522010-08-12 04:14:14 +0100225
Mikulas Patockac96053b2010-08-12 04:14:21 +0100226 if (sc->stripes_shift < 0)
227 *stripe = sector_div(chunk, sc->stripes);
228 else {
Mikulas Patocka1df05482012-07-27 15:08:00 +0100229 *stripe = chunk & (sc->stripes - 1);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100230 chunk >>= sc->stripes_shift;
231 }
232
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100233 if (sc->chunk_size_shift < 0)
234 chunk *= sc->chunk_size;
235 else
236 chunk <<= sc->chunk_size_shift;
237
238 *result = chunk + chunk_offset;
Mikulas Patocka65988522010-08-12 04:14:14 +0100239}
240
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100241static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector,
242 uint32_t target_stripe, sector_t *result)
243{
244 uint32_t stripe;
245
246 stripe_map_sector(sc, sector, &stripe, result);
247 if (stripe == target_stripe)
248 return;
Mike Snitzereb850de2012-07-27 15:08:01 +0100249
250 /* round down */
251 sector = *result;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100252 if (sc->chunk_size_shift < 0)
253 *result -= sector_div(sector, sc->chunk_size);
254 else
255 *result = sector & ~(sector_t)(sc->chunk_size - 1);
Mike Snitzereb850de2012-07-27 15:08:01 +0100256
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100257 if (target_stripe < stripe)
Mike Snitzereb850de2012-07-27 15:08:01 +0100258 *result += sc->chunk_size; /* next chunk */
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100259}
260
Mike Snitzer45e621d2012-12-21 20:23:41 +0000261static int stripe_map_range(struct stripe_c *sc, struct bio *bio,
262 uint32_t target_stripe)
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100263{
264 sector_t begin, end;
265
Kent Overstreet4f024f32013-10-11 15:44:27 -0700266 stripe_map_range_sector(sc, bio->bi_iter.bi_sector,
267 target_stripe, &begin);
Kent Overstreetf73a1c72012-09-25 15:05:12 -0700268 stripe_map_range_sector(sc, bio_end_sector(bio),
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100269 target_stripe, &end);
270 if (begin < end) {
271 bio->bi_bdev = sc->stripe[target_stripe].dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700272 bio->bi_iter.bi_sector = begin +
273 sc->stripe[target_stripe].physical_start;
274 bio->bi_iter.bi_size = to_bytes(end - begin);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100275 return DM_MAPIO_REMAPPED;
276 } else {
277 /* The range doesn't map to the target stripe */
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200278 bio_endio(bio);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100279 return DM_MAPIO_SUBMITTED;
280 }
281}
282
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000283static int stripe_map(struct dm_target *ti, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
Mikulas Patocka65988522010-08-12 04:14:14 +0100285 struct stripe_c *sc = ti->private;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100286 uint32_t stripe;
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000287 unsigned target_bio_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Tejun Heod87f4c12010-09-03 11:56:19 +0200289 if (bio->bi_rw & REQ_FLUSH) {
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000290 target_bio_nr = dm_bio_get_target_bio_nr(bio);
291 BUG_ON(target_bio_nr >= sc->stripes);
292 bio->bi_bdev = sc->stripe[target_bio_nr].dev->bdev;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100293 return DM_MAPIO_REMAPPED;
294 }
Mike Snitzer45e621d2012-12-21 20:23:41 +0000295 if (unlikely(bio->bi_rw & REQ_DISCARD) ||
296 unlikely(bio->bi_rw & REQ_WRITE_SAME)) {
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000297 target_bio_nr = dm_bio_get_target_bio_nr(bio);
298 BUG_ON(target_bio_nr >= sc->stripes);
299 return stripe_map_range(sc, bio, target_bio_nr);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100300 }
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100301
Kent Overstreet4f024f32013-10-11 15:44:27 -0700302 stripe_map_sector(sc, bio->bi_iter.bi_sector,
303 &stripe, &bio->bi_iter.bi_sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Kent Overstreet4f024f32013-10-11 15:44:27 -0700305 bio->bi_iter.bi_sector += sc->stripe[stripe].physical_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 bio->bi_bdev = sc->stripe[stripe].dev->bdev;
Mikulas Patocka65988522010-08-12 04:14:14 +0100307
Kiyoshi Uedad2a7ad22006-12-08 02:41:06 -0800308 return DM_MAPIO_REMAPPED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
Brian Wood4f7f5c62008-02-08 02:11:24 +0000311/*
312 * Stripe status:
313 *
314 * INFO
315 * #stripes [stripe_name <stripe_name>] [group word count]
316 * [error count 'A|D' <error count 'A|D'>]
317 *
318 * TABLE
319 * #stripes [stripe chunk size]
320 * [stripe_name physical_start <stripe_name physical_start>]
321 *
322 */
323
Mikulas Patockafd7c0922013-03-01 22:45:44 +0000324static void stripe_status(struct dm_target *ti, status_type_t type,
325 unsigned status_flags, char *result, unsigned maxlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
327 struct stripe_c *sc = (struct stripe_c *) ti->private;
Brian Wood4f7f5c62008-02-08 02:11:24 +0000328 char buffer[sc->stripes + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 unsigned int sz = 0;
330 unsigned int i;
331
332 switch (type) {
333 case STATUSTYPE_INFO:
Brian Wood4f7f5c62008-02-08 02:11:24 +0000334 DMEMIT("%d ", sc->stripes);
335 for (i = 0; i < sc->stripes; i++) {
336 DMEMIT("%s ", sc->stripe[i].dev->name);
337 buffer[i] = atomic_read(&(sc->stripe[i].error_count)) ?
338 'D' : 'A';
339 }
340 buffer[i] = '\0';
341 DMEMIT("1 %s", buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 break;
343
344 case STATUSTYPE_TABLE:
Andrew Morton4ee218c2006-03-27 01:17:48 -0800345 DMEMIT("%d %llu", sc->stripes,
Mike Snitzereb850de2012-07-27 15:08:01 +0100346 (unsigned long long)sc->chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 for (i = 0; i < sc->stripes; i++)
Andrew Morton4ee218c2006-03-27 01:17:48 -0800348 DMEMIT(" %s %llu", sc->stripe[i].dev->name,
349 (unsigned long long)sc->stripe[i].physical_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 break;
351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000354static int stripe_end_io(struct dm_target *ti, struct bio *bio, int error)
Brian Wooda25eb942008-02-08 02:11:22 +0000355{
356 unsigned i;
357 char major_minor[16];
358 struct stripe_c *sc = ti->private;
359
360 if (!error)
361 return 0; /* I/O complete */
362
Christoph Hellwig7b6d91d2010-08-07 18:20:39 +0200363 if ((error == -EWOULDBLOCK) && (bio->bi_rw & REQ_RAHEAD))
Brian Wooda25eb942008-02-08 02:11:22 +0000364 return error;
365
366 if (error == -EOPNOTSUPP)
367 return error;
368
369 memset(major_minor, 0, sizeof(major_minor));
370 sprintf(major_minor, "%d:%d",
Tejun Heof331c022008-09-03 09:01:48 +0200371 MAJOR(disk_devt(bio->bi_bdev->bd_disk)),
372 MINOR(disk_devt(bio->bi_bdev->bd_disk)));
Brian Wooda25eb942008-02-08 02:11:22 +0000373
374 /*
375 * Test to see which stripe drive triggered the event
376 * and increment error count for all stripes on that device.
377 * If the error count for a given device exceeds the threshold
378 * value we will no longer trigger any further events.
379 */
380 for (i = 0; i < sc->stripes; i++)
381 if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
382 atomic_inc(&(sc->stripe[i].error_count));
383 if (atomic_read(&(sc->stripe[i].error_count)) <
384 DM_IO_ERROR_THRESHOLD)
Tejun Heof521f072011-01-13 19:59:57 +0000385 schedule_work(&sc->trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000386 }
387
388 return error;
389}
390
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100391static int stripe_iterate_devices(struct dm_target *ti,
392 iterate_devices_callout_fn fn, void *data)
393{
394 struct stripe_c *sc = ti->private;
395 int ret = 0;
396 unsigned i = 0;
397
Mike Snitzer5dea2712009-07-23 20:30:42 +0100398 do {
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100399 ret = fn(ti, sc->stripe[i].dev,
Mike Snitzer5dea2712009-07-23 20:30:42 +0100400 sc->stripe[i].physical_start,
401 sc->stripe_width, data);
402 } while (!ret && ++i < sc->stripes);
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100403
404 return ret;
405}
406
Mike Snitzer40bea432009-09-04 20:40:25 +0100407static void stripe_io_hints(struct dm_target *ti,
408 struct queue_limits *limits)
409{
410 struct stripe_c *sc = ti->private;
Mike Snitzereb850de2012-07-27 15:08:01 +0100411 unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT;
Mike Snitzer40bea432009-09-04 20:40:25 +0100412
413 blk_limits_io_min(limits, chunk_size);
Martin K. Petersen3c5820c2009-09-11 21:54:52 +0200414 blk_limits_io_opt(limits, chunk_size * sc->stripes);
Mike Snitzer40bea432009-09-04 20:40:25 +0100415}
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417static struct target_type stripe_target = {
418 .name = "striped",
Mikulas Patockafd7c0922013-03-01 22:45:44 +0000419 .version = {1, 5, 1},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 .module = THIS_MODULE,
421 .ctr = stripe_ctr,
422 .dtr = stripe_dtr,
423 .map = stripe_map,
Brian Wooda25eb942008-02-08 02:11:22 +0000424 .end_io = stripe_end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 .status = stripe_status,
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100426 .iterate_devices = stripe_iterate_devices,
Mike Snitzer40bea432009-09-04 20:40:25 +0100427 .io_hints = stripe_io_hints,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428};
429
430int __init dm_stripe_init(void)
431{
432 int r;
433
434 r = dm_register_target(&stripe_target);
Luis Henriquese223e1d2015-04-27 21:29:36 +0100435 if (r < 0)
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700436 DMWARN("target registration failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 return r;
439}
440
441void dm_stripe_exit(void)
442{
Mikulas Patocka10d3bd02009-01-06 03:04:58 +0000443 dm_unregister_target(&stripe_target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}