blob: f8b37d4c05d8c301658a42c116110d1b63fc9323 [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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Mikulas Patocka31998ef2012-03-28 18:41:26 +010079 if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return -EINVAL;
81
Nikanth Karthikesan8215d6e2010-03-06 02:32:27 +000082 if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 &sc->stripe[stripe].dev))
84 return -ENXIO;
85
86 sc->stripe[stripe].physical_start = start;
Brian Wooda25eb942008-02-08 02:11:22 +000087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return 0;
89}
90
91/*
92 * Construct a striped mapping.
Mike Snitzereb850de2012-07-27 15:08:01 +010093 * <number of stripes> <chunk size> [<dev_path> <offset>]+
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 */
95static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
96{
97 struct stripe_c *sc;
Mike Snitzerd793e6842013-05-10 14:37:14 +010098 sector_t width, tmp_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 uint32_t stripes;
100 uint32_t chunk_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 int r;
102 unsigned int i;
103
104 if (argc < 2) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700105 ti->error = "Not enough arguments";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 return -EINVAL;
107 }
108
majianpeng1a66a082012-07-27 15:07:59 +0100109 if (kstrtouint(argv[0], 10, &stripes) || !stripes) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700110 ti->error = "Invalid stripe count";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 return -EINVAL;
112 }
113
Mikulas Patocka8f069b42012-07-27 15:08:01 +0100114 if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700115 ti->error = "Invalid chunk_size";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return -EINVAL;
117 }
118
Mike Snitzereb850de2012-07-27 15:08:01 +0100119 width = ti->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (sector_div(width, stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700121 ti->error = "Target length not divisible by "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 "number of stripes";
123 return -EINVAL;
124 }
125
Mike Snitzerd793e6842013-05-10 14:37:14 +0100126 tmp_len = width;
127 if (sector_div(tmp_len, chunk_size)) {
128 ti->error = "Target length not divisible by "
129 "chunk size";
130 return -EINVAL;
131 }
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 /*
134 * Do we have enough arguments for that many stripes ?
135 */
136 if (argc != (2 + 2 * stripes)) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700137 ti->error = "Not enough destinations "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 "specified";
139 return -EINVAL;
140 }
141
142 sc = alloc_context(stripes);
143 if (!sc) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700144 ti->error = "Memory allocation for striped context "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 "failed";
146 return -ENOMEM;
147 }
148
Tejun Heof521f072011-01-13 19:59:57 +0000149 INIT_WORK(&sc->trigger_event, trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000150
151 /* Set pointer to dm target; used in trigger_event */
152 sc->ti = ti;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 sc->stripes = stripes;
154 sc->stripe_width = width;
Mikulas Patockac96053b2010-08-12 04:14:21 +0100155
156 if (stripes & (stripes - 1))
157 sc->stripes_shift = -1;
Mikulas Patocka1df05482012-07-27 15:08:00 +0100158 else
159 sc->stripes_shift = __ffs(stripes);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100160
Mike Snitzer542f9032012-07-27 15:08:00 +0100161 r = dm_set_target_max_io_len(ti, chunk_size);
Pavitra Kumara3f2af22014-10-10 15:19:46 +0000162 if (r) {
163 kfree(sc);
Mike Snitzer542f9032012-07-27 15:08:00 +0100164 return r;
Pavitra Kumara3f2af22014-10-10 15:19:46 +0000165 }
Mike Snitzer542f9032012-07-27 15:08:00 +0100166
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000167 ti->num_flush_bios = stripes;
168 ti->num_discard_bios = stripes;
169 ti->num_write_same_bios = stripes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Mike Snitzereb850de2012-07-27 15:08:01 +0100171 sc->chunk_size = chunk_size;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100172 if (chunk_size & (chunk_size - 1))
173 sc->chunk_size_shift = -1;
174 else
175 sc->chunk_size_shift = __ffs(chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 /*
178 * Get the stripe destinations.
179 */
180 for (i = 0; i < stripes; i++) {
181 argv += 2;
182
183 r = get_stripe(ti, sc, i, argv);
184 if (r < 0) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700185 ti->error = "Couldn't parse stripe destination";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 while (i--)
187 dm_put_device(ti, sc->stripe[i].dev);
188 kfree(sc);
189 return r;
190 }
Brian Wooda25eb942008-02-08 02:11:22 +0000191 atomic_set(&(sc->stripe[i].error_count), 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193
194 ti->private = sc;
Brian Wooda25eb942008-02-08 02:11:22 +0000195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return 0;
197}
198
199static void stripe_dtr(struct dm_target *ti)
200{
201 unsigned int i;
202 struct stripe_c *sc = (struct stripe_c *) ti->private;
203
204 for (i = 0; i < sc->stripes; i++)
205 dm_put_device(ti, sc->stripe[i].dev);
206
Tejun Heo43829732012-08-20 14:51:24 -0700207 flush_work(&sc->trigger_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 kfree(sc);
209}
210
Mikulas Patocka65988522010-08-12 04:14:14 +0100211static void stripe_map_sector(struct stripe_c *sc, sector_t sector,
212 uint32_t *stripe, sector_t *result)
213{
Mike Snitzereb850de2012-07-27 15:08:01 +0100214 sector_t chunk = dm_target_offset(sc->ti, sector);
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100215 sector_t chunk_offset;
216
217 if (sc->chunk_size_shift < 0)
218 chunk_offset = sector_div(chunk, sc->chunk_size);
219 else {
220 chunk_offset = chunk & (sc->chunk_size - 1);
221 chunk >>= sc->chunk_size_shift;
222 }
Mikulas Patocka65988522010-08-12 04:14:14 +0100223
Mikulas Patockac96053b2010-08-12 04:14:21 +0100224 if (sc->stripes_shift < 0)
225 *stripe = sector_div(chunk, sc->stripes);
226 else {
Mikulas Patocka1df05482012-07-27 15:08:00 +0100227 *stripe = chunk & (sc->stripes - 1);
Mikulas Patockac96053b2010-08-12 04:14:21 +0100228 chunk >>= sc->stripes_shift;
229 }
230
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100231 if (sc->chunk_size_shift < 0)
232 chunk *= sc->chunk_size;
233 else
234 chunk <<= sc->chunk_size_shift;
235
236 *result = chunk + chunk_offset;
Mikulas Patocka65988522010-08-12 04:14:14 +0100237}
238
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100239static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector,
240 uint32_t target_stripe, sector_t *result)
241{
242 uint32_t stripe;
243
244 stripe_map_sector(sc, sector, &stripe, result);
245 if (stripe == target_stripe)
246 return;
Mike Snitzereb850de2012-07-27 15:08:01 +0100247
248 /* round down */
249 sector = *result;
Mikulas Patocka33d07c02012-07-27 15:08:02 +0100250 if (sc->chunk_size_shift < 0)
251 *result -= sector_div(sector, sc->chunk_size);
252 else
253 *result = sector & ~(sector_t)(sc->chunk_size - 1);
Mike Snitzereb850de2012-07-27 15:08:01 +0100254
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100255 if (target_stripe < stripe)
Mike Snitzereb850de2012-07-27 15:08:01 +0100256 *result += sc->chunk_size; /* next chunk */
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100257}
258
Mike Snitzer45e621d2012-12-21 20:23:41 +0000259static int stripe_map_range(struct stripe_c *sc, struct bio *bio,
260 uint32_t target_stripe)
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100261{
262 sector_t begin, end;
263
Kent Overstreet4f024f32013-10-11 15:44:27 -0700264 stripe_map_range_sector(sc, bio->bi_iter.bi_sector,
265 target_stripe, &begin);
Kent Overstreetf73a1c72012-09-25 15:05:12 -0700266 stripe_map_range_sector(sc, bio_end_sector(bio),
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100267 target_stripe, &end);
268 if (begin < end) {
269 bio->bi_bdev = sc->stripe[target_stripe].dev->bdev;
Kent Overstreet4f024f32013-10-11 15:44:27 -0700270 bio->bi_iter.bi_sector = begin +
271 sc->stripe[target_stripe].physical_start;
272 bio->bi_iter.bi_size = to_bytes(end - begin);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100273 return DM_MAPIO_REMAPPED;
274 } else {
275 /* The range doesn't map to the target stripe */
276 bio_endio(bio, 0);
277 return DM_MAPIO_SUBMITTED;
278 }
279}
280
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000281static int stripe_map(struct dm_target *ti, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
Mikulas Patocka65988522010-08-12 04:14:14 +0100283 struct stripe_c *sc = ti->private;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100284 uint32_t stripe;
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000285 unsigned target_bio_nr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Tejun Heod87f4c12010-09-03 11:56:19 +0200287 if (bio->bi_rw & REQ_FLUSH) {
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000288 target_bio_nr = dm_bio_get_target_bio_nr(bio);
289 BUG_ON(target_bio_nr >= sc->stripes);
290 bio->bi_bdev = sc->stripe[target_bio_nr].dev->bdev;
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100291 return DM_MAPIO_REMAPPED;
292 }
Mike Snitzer45e621d2012-12-21 20:23:41 +0000293 if (unlikely(bio->bi_rw & REQ_DISCARD) ||
294 unlikely(bio->bi_rw & REQ_WRITE_SAME)) {
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +0000295 target_bio_nr = dm_bio_get_target_bio_nr(bio);
296 BUG_ON(target_bio_nr >= sc->stripes);
297 return stripe_map_range(sc, bio, target_bio_nr);
Mikulas Patocka7b76ec12010-08-12 04:14:26 +0100298 }
Mikulas Patocka374bf7e2009-06-22 10:12:22 +0100299
Kent Overstreet4f024f32013-10-11 15:44:27 -0700300 stripe_map_sector(sc, bio->bi_iter.bi_sector,
301 &stripe, &bio->bi_iter.bi_sector);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Kent Overstreet4f024f32013-10-11 15:44:27 -0700303 bio->bi_iter.bi_sector += sc->stripe[stripe].physical_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 bio->bi_bdev = sc->stripe[stripe].dev->bdev;
Mikulas Patocka65988522010-08-12 04:14:14 +0100305
Kiyoshi Uedad2a7ad22006-12-08 02:41:06 -0800306 return DM_MAPIO_REMAPPED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
Brian Wood4f7f5c62008-02-08 02:11:24 +0000309/*
310 * Stripe status:
311 *
312 * INFO
313 * #stripes [stripe_name <stripe_name>] [group word count]
314 * [error count 'A|D' <error count 'A|D'>]
315 *
316 * TABLE
317 * #stripes [stripe chunk size]
318 * [stripe_name physical_start <stripe_name physical_start>]
319 *
320 */
321
Mikulas Patockafd7c0922013-03-01 22:45:44 +0000322static void stripe_status(struct dm_target *ti, status_type_t type,
323 unsigned status_flags, char *result, unsigned maxlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
325 struct stripe_c *sc = (struct stripe_c *) ti->private;
Brian Wood4f7f5c62008-02-08 02:11:24 +0000326 char buffer[sc->stripes + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 unsigned int sz = 0;
328 unsigned int i;
329
330 switch (type) {
331 case STATUSTYPE_INFO:
Brian Wood4f7f5c62008-02-08 02:11:24 +0000332 DMEMIT("%d ", sc->stripes);
333 for (i = 0; i < sc->stripes; i++) {
334 DMEMIT("%s ", sc->stripe[i].dev->name);
335 buffer[i] = atomic_read(&(sc->stripe[i].error_count)) ?
336 'D' : 'A';
337 }
338 buffer[i] = '\0';
339 DMEMIT("1 %s", buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 break;
341
342 case STATUSTYPE_TABLE:
Andrew Morton4ee218c2006-03-27 01:17:48 -0800343 DMEMIT("%d %llu", sc->stripes,
Mike Snitzereb850de2012-07-27 15:08:01 +0100344 (unsigned long long)sc->chunk_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 for (i = 0; i < sc->stripes; i++)
Andrew Morton4ee218c2006-03-27 01:17:48 -0800346 DMEMIT(" %s %llu", sc->stripe[i].dev->name,
347 (unsigned long long)sc->stripe[i].physical_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 break;
349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
Mikulas Patocka7de3ee52012-12-21 20:23:41 +0000352static int stripe_end_io(struct dm_target *ti, struct bio *bio, int error)
Brian Wooda25eb942008-02-08 02:11:22 +0000353{
354 unsigned i;
355 char major_minor[16];
356 struct stripe_c *sc = ti->private;
357
358 if (!error)
359 return 0; /* I/O complete */
360
Christoph Hellwig7b6d91d2010-08-07 18:20:39 +0200361 if ((error == -EWOULDBLOCK) && (bio->bi_rw & REQ_RAHEAD))
Brian Wooda25eb942008-02-08 02:11:22 +0000362 return error;
363
364 if (error == -EOPNOTSUPP)
365 return error;
366
367 memset(major_minor, 0, sizeof(major_minor));
368 sprintf(major_minor, "%d:%d",
Tejun Heof331c022008-09-03 09:01:48 +0200369 MAJOR(disk_devt(bio->bi_bdev->bd_disk)),
370 MINOR(disk_devt(bio->bi_bdev->bd_disk)));
Brian Wooda25eb942008-02-08 02:11:22 +0000371
372 /*
373 * Test to see which stripe drive triggered the event
374 * and increment error count for all stripes on that device.
375 * If the error count for a given device exceeds the threshold
376 * value we will no longer trigger any further events.
377 */
378 for (i = 0; i < sc->stripes; i++)
379 if (!strcmp(sc->stripe[i].dev->name, major_minor)) {
380 atomic_inc(&(sc->stripe[i].error_count));
381 if (atomic_read(&(sc->stripe[i].error_count)) <
382 DM_IO_ERROR_THRESHOLD)
Tejun Heof521f072011-01-13 19:59:57 +0000383 schedule_work(&sc->trigger_event);
Brian Wooda25eb942008-02-08 02:11:22 +0000384 }
385
386 return error;
387}
388
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100389static int stripe_iterate_devices(struct dm_target *ti,
390 iterate_devices_callout_fn fn, void *data)
391{
392 struct stripe_c *sc = ti->private;
393 int ret = 0;
394 unsigned i = 0;
395
Mike Snitzer5dea2712009-07-23 20:30:42 +0100396 do {
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100397 ret = fn(ti, sc->stripe[i].dev,
Mike Snitzer5dea2712009-07-23 20:30:42 +0100398 sc->stripe[i].physical_start,
399 sc->stripe_width, data);
400 } while (!ret && ++i < sc->stripes);
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100401
402 return ret;
403}
404
Mike Snitzer40bea432009-09-04 20:40:25 +0100405static void stripe_io_hints(struct dm_target *ti,
406 struct queue_limits *limits)
407{
408 struct stripe_c *sc = ti->private;
Mike Snitzereb850de2012-07-27 15:08:01 +0100409 unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT;
Mike Snitzer40bea432009-09-04 20:40:25 +0100410
411 blk_limits_io_min(limits, chunk_size);
Martin K. Petersen3c5820c2009-09-11 21:54:52 +0200412 blk_limits_io_opt(limits, chunk_size * sc->stripes);
Mike Snitzer40bea432009-09-04 20:40:25 +0100413}
414
Mustafa Mesanovic29915202011-03-24 13:54:35 +0000415static int stripe_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
416 struct bio_vec *biovec, int max_size)
417{
418 struct stripe_c *sc = ti->private;
419 sector_t bvm_sector = bvm->bi_sector;
420 uint32_t stripe;
421 struct request_queue *q;
422
423 stripe_map_sector(sc, bvm_sector, &stripe, &bvm_sector);
424
425 q = bdev_get_queue(sc->stripe[stripe].dev->bdev);
426 if (!q->merge_bvec_fn)
427 return max_size;
428
429 bvm->bi_bdev = sc->stripe[stripe].dev->bdev;
430 bvm->bi_sector = sc->stripe[stripe].physical_start + bvm_sector;
431
432 return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
433}
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435static struct target_type stripe_target = {
436 .name = "striped",
Mikulas Patockafd7c0922013-03-01 22:45:44 +0000437 .version = {1, 5, 1},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 .module = THIS_MODULE,
439 .ctr = stripe_ctr,
440 .dtr = stripe_dtr,
441 .map = stripe_map,
Brian Wooda25eb942008-02-08 02:11:22 +0000442 .end_io = stripe_end_io,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 .status = stripe_status,
Mike Snitzeraf4874e2009-06-22 10:12:33 +0100444 .iterate_devices = stripe_iterate_devices,
Mike Snitzer40bea432009-09-04 20:40:25 +0100445 .io_hints = stripe_io_hints,
Mustafa Mesanovic29915202011-03-24 13:54:35 +0000446 .merge = stripe_merge,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447};
448
449int __init dm_stripe_init(void)
450{
451 int r;
452
453 r = dm_register_target(&stripe_target);
Heinz Mauelshagen6edebde2008-11-13 23:38:56 +0000454 if (r < 0) {
Alasdair G Kergon72d94862006-06-26 00:27:35 -0700455 DMWARN("target registration failed");
Heinz Mauelshagen6edebde2008-11-13 23:38:56 +0000456 return r;
457 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 return r;
460}
461
462void dm_stripe_exit(void)
463{
Mikulas Patocka10d3bd02009-01-06 03:04:58 +0000464 dm_unregister_target(&stripe_target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}