Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001-2003 Sistina Software (UK) Limited. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7fff5e8f | 7 | #include "dm.h" |
586e80e6 | 8 | #include <linux/device-mapper.h> |
1da177e4 LT |
9 | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/bio.h> | |
817bf402 | 14 | #include <linux/dax.h> |
1da177e4 | 15 | #include <linux/slab.h> |
6f3c3f0a | 16 | #include <linux/log2.h> |
1da177e4 | 17 | |
72d94861 | 18 | #define DM_MSG_PREFIX "striped" |
a25eb944 | 19 | #define DM_IO_ERROR_THRESHOLD 15 |
72d94861 | 20 | |
1da177e4 LT |
21 | struct stripe { |
22 | struct dm_dev *dev; | |
23 | sector_t physical_start; | |
a25eb944 BW |
24 | |
25 | atomic_t error_count; | |
1da177e4 LT |
26 | }; |
27 | ||
28 | struct stripe_c { | |
29 | uint32_t stripes; | |
c96053b7 | 30 | int stripes_shift; |
1da177e4 LT |
31 | |
32 | /* The size of this target / num. stripes */ | |
33 | sector_t stripe_width; | |
34 | ||
eb850de6 | 35 | uint32_t chunk_size; |
33d07c0d | 36 | int chunk_size_shift; |
1da177e4 | 37 | |
a25eb944 BW |
38 | /* Needed for handling events */ |
39 | struct dm_target *ti; | |
40 | ||
41 | /* Work struct used for triggering events*/ | |
f521f074 | 42 | struct work_struct trigger_event; |
a25eb944 | 43 | |
1da177e4 LT |
44 | struct stripe stripe[0]; |
45 | }; | |
46 | ||
a25eb944 BW |
47 | /* |
48 | * An event is triggered whenever a drive | |
49 | * drops out of a stripe volume. | |
50 | */ | |
51 | static void trigger_event(struct work_struct *work) | |
52 | { | |
f521f074 TH |
53 | struct stripe_c *sc = container_of(work, struct stripe_c, |
54 | trigger_event); | |
a25eb944 | 55 | dm_table_event(sc->ti->table); |
a25eb944 BW |
56 | } |
57 | ||
1da177e4 LT |
58 | static inline struct stripe_c *alloc_context(unsigned int stripes) |
59 | { | |
60 | size_t len; | |
61 | ||
d63a5ce3 MP |
62 | if (dm_array_too_big(sizeof(struct stripe_c), sizeof(struct stripe), |
63 | stripes)) | |
1da177e4 LT |
64 | return NULL; |
65 | ||
66 | len = sizeof(struct stripe_c) + (sizeof(struct stripe) * stripes); | |
67 | ||
68 | return kmalloc(len, GFP_KERNEL); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Parse a single <dev> <sector> pair | |
73 | */ | |
74 | static int get_stripe(struct dm_target *ti, struct stripe_c *sc, | |
75 | unsigned int stripe, char **argv) | |
76 | { | |
4ee218cd | 77 | unsigned long long start; |
31998ef1 | 78 | char dummy; |
e80d1c80 | 79 | int ret; |
1da177e4 | 80 | |
31998ef1 | 81 | if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1) |
1da177e4 LT |
82 | return -EINVAL; |
83 | ||
e80d1c80 VG |
84 | ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), |
85 | &sc->stripe[stripe].dev); | |
86 | if (ret) | |
87 | return ret; | |
1da177e4 LT |
88 | |
89 | sc->stripe[stripe].physical_start = start; | |
a25eb944 | 90 | |
1da177e4 LT |
91 | return 0; |
92 | } | |
93 | ||
94 | /* | |
95 | * Construct a striped mapping. | |
eb850de6 | 96 | * <number of stripes> <chunk size> [<dev_path> <offset>]+ |
1da177e4 LT |
97 | */ |
98 | static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
99 | { | |
100 | struct stripe_c *sc; | |
d793e684 | 101 | sector_t width, tmp_len; |
1da177e4 LT |
102 | uint32_t stripes; |
103 | uint32_t chunk_size; | |
1da177e4 LT |
104 | int r; |
105 | unsigned int i; | |
106 | ||
107 | if (argc < 2) { | |
72d94861 | 108 | ti->error = "Not enough arguments"; |
1da177e4 LT |
109 | return -EINVAL; |
110 | } | |
111 | ||
1a66a08a | 112 | if (kstrtouint(argv[0], 10, &stripes) || !stripes) { |
72d94861 | 113 | ti->error = "Invalid stripe count"; |
1da177e4 LT |
114 | return -EINVAL; |
115 | } | |
116 | ||
8f069b41 | 117 | if (kstrtouint(argv[1], 10, &chunk_size) || !chunk_size) { |
eb850de6 | 118 | ti->error = "Invalid chunk_size"; |
1da177e4 LT |
119 | return -EINVAL; |
120 | } | |
121 | ||
eb850de6 | 122 | width = ti->len; |
d793e684 | 123 | if (sector_div(width, stripes)) { |
72d94861 | 124 | ti->error = "Target length not divisible by " |
d793e684 | 125 | "number of stripes"; |
8ba32fde KC |
126 | return -EINVAL; |
127 | } | |
128 | ||
d793e684 MS |
129 | tmp_len = width; |
130 | if (sector_div(tmp_len, chunk_size)) { | |
72d94861 | 131 | ti->error = "Target length not divisible by " |
d793e684 | 132 | "chunk size"; |
1da177e4 LT |
133 | return -EINVAL; |
134 | } | |
135 | ||
136 | /* | |
137 | * Do we have enough arguments for that many stripes ? | |
138 | */ | |
139 | if (argc != (2 + 2 * stripes)) { | |
72d94861 | 140 | ti->error = "Not enough destinations " |
1da177e4 LT |
141 | "specified"; |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | sc = alloc_context(stripes); | |
146 | if (!sc) { | |
72d94861 | 147 | ti->error = "Memory allocation for striped context " |
1da177e4 LT |
148 | "failed"; |
149 | return -ENOMEM; | |
150 | } | |
151 | ||
f521f074 | 152 | INIT_WORK(&sc->trigger_event, trigger_event); |
a25eb944 BW |
153 | |
154 | /* Set pointer to dm target; used in trigger_event */ | |
155 | sc->ti = ti; | |
1da177e4 LT |
156 | sc->stripes = stripes; |
157 | sc->stripe_width = width; | |
c96053b7 MP |
158 | |
159 | if (stripes & (stripes - 1)) | |
160 | sc->stripes_shift = -1; | |
1df05483 MP |
161 | else |
162 | sc->stripes_shift = __ffs(stripes); | |
c96053b7 | 163 | |
542f9038 | 164 | r = dm_set_target_max_io_len(ti, chunk_size); |
a3f2af25 PK |
165 | if (r) { |
166 | kfree(sc); | |
542f9038 | 167 | return r; |
a3f2af25 | 168 | } |
542f9038 | 169 | |
55a62eef AK |
170 | ti->num_flush_bios = stripes; |
171 | ti->num_discard_bios = stripes; | |
00716545 | 172 | ti->num_secure_erase_bios = stripes; |
55a62eef | 173 | ti->num_write_same_bios = stripes; |
ac62d620 | 174 | ti->num_write_zeroes_bios = stripes; |
1da177e4 | 175 | |
eb850de6 | 176 | sc->chunk_size = chunk_size; |
33d07c0d MP |
177 | if (chunk_size & (chunk_size - 1)) |
178 | sc->chunk_size_shift = -1; | |
179 | else | |
180 | sc->chunk_size_shift = __ffs(chunk_size); | |
1da177e4 LT |
181 | |
182 | /* | |
183 | * Get the stripe destinations. | |
184 | */ | |
185 | for (i = 0; i < stripes; i++) { | |
186 | argv += 2; | |
187 | ||
188 | r = get_stripe(ti, sc, i, argv); | |
189 | if (r < 0) { | |
72d94861 | 190 | ti->error = "Couldn't parse stripe destination"; |
1da177e4 LT |
191 | while (i--) |
192 | dm_put_device(ti, sc->stripe[i].dev); | |
193 | kfree(sc); | |
194 | return r; | |
195 | } | |
a25eb944 | 196 | atomic_set(&(sc->stripe[i].error_count), 0); |
1da177e4 LT |
197 | } |
198 | ||
199 | ti->private = sc; | |
a25eb944 | 200 | |
1da177e4 LT |
201 | return 0; |
202 | } | |
203 | ||
204 | static void stripe_dtr(struct dm_target *ti) | |
205 | { | |
206 | unsigned int i; | |
207 | struct stripe_c *sc = (struct stripe_c *) ti->private; | |
208 | ||
209 | for (i = 0; i < sc->stripes; i++) | |
210 | dm_put_device(ti, sc->stripe[i].dev); | |
211 | ||
43829731 | 212 | flush_work(&sc->trigger_event); |
1da177e4 LT |
213 | kfree(sc); |
214 | } | |
215 | ||
65988525 MP |
216 | static void stripe_map_sector(struct stripe_c *sc, sector_t sector, |
217 | uint32_t *stripe, sector_t *result) | |
218 | { | |
eb850de6 | 219 | sector_t chunk = dm_target_offset(sc->ti, sector); |
33d07c0d MP |
220 | sector_t chunk_offset; |
221 | ||
222 | if (sc->chunk_size_shift < 0) | |
223 | chunk_offset = sector_div(chunk, sc->chunk_size); | |
224 | else { | |
225 | chunk_offset = chunk & (sc->chunk_size - 1); | |
226 | chunk >>= sc->chunk_size_shift; | |
227 | } | |
65988525 | 228 | |
c96053b7 MP |
229 | if (sc->stripes_shift < 0) |
230 | *stripe = sector_div(chunk, sc->stripes); | |
231 | else { | |
1df05483 | 232 | *stripe = chunk & (sc->stripes - 1); |
c96053b7 MP |
233 | chunk >>= sc->stripes_shift; |
234 | } | |
235 | ||
33d07c0d MP |
236 | if (sc->chunk_size_shift < 0) |
237 | chunk *= sc->chunk_size; | |
238 | else | |
239 | chunk <<= sc->chunk_size_shift; | |
240 | ||
241 | *result = chunk + chunk_offset; | |
65988525 MP |
242 | } |
243 | ||
7b76ec11 MP |
244 | static void stripe_map_range_sector(struct stripe_c *sc, sector_t sector, |
245 | uint32_t target_stripe, sector_t *result) | |
246 | { | |
247 | uint32_t stripe; | |
248 | ||
249 | stripe_map_sector(sc, sector, &stripe, result); | |
250 | if (stripe == target_stripe) | |
251 | return; | |
eb850de6 MS |
252 | |
253 | /* round down */ | |
254 | sector = *result; | |
33d07c0d MP |
255 | if (sc->chunk_size_shift < 0) |
256 | *result -= sector_div(sector, sc->chunk_size); | |
257 | else | |
258 | *result = sector & ~(sector_t)(sc->chunk_size - 1); | |
eb850de6 | 259 | |
7b76ec11 | 260 | if (target_stripe < stripe) |
eb850de6 | 261 | *result += sc->chunk_size; /* next chunk */ |
7b76ec11 MP |
262 | } |
263 | ||
45e621d4 MS |
264 | static int stripe_map_range(struct stripe_c *sc, struct bio *bio, |
265 | uint32_t target_stripe) | |
7b76ec11 MP |
266 | { |
267 | sector_t begin, end; | |
268 | ||
4f024f37 KO |
269 | stripe_map_range_sector(sc, bio->bi_iter.bi_sector, |
270 | target_stripe, &begin); | |
f73a1c7d | 271 | stripe_map_range_sector(sc, bio_end_sector(bio), |
7b76ec11 MP |
272 | target_stripe, &end); |
273 | if (begin < end) { | |
74d46992 | 274 | bio_set_dev(bio, sc->stripe[target_stripe].dev->bdev); |
4f024f37 KO |
275 | bio->bi_iter.bi_sector = begin + |
276 | sc->stripe[target_stripe].physical_start; | |
277 | bio->bi_iter.bi_size = to_bytes(end - begin); | |
7b76ec11 MP |
278 | return DM_MAPIO_REMAPPED; |
279 | } else { | |
280 | /* The range doesn't map to the target stripe */ | |
4246a0b6 | 281 | bio_endio(bio); |
7b76ec11 MP |
282 | return DM_MAPIO_SUBMITTED; |
283 | } | |
284 | } | |
285 | ||
7de3ee57 | 286 | static int stripe_map(struct dm_target *ti, struct bio *bio) |
1da177e4 | 287 | { |
65988525 | 288 | struct stripe_c *sc = ti->private; |
374bf7e7 | 289 | uint32_t stripe; |
55a62eef | 290 | unsigned target_bio_nr; |
1da177e4 | 291 | |
1eff9d32 | 292 | if (bio->bi_opf & REQ_PREFLUSH) { |
55a62eef AK |
293 | target_bio_nr = dm_bio_get_target_bio_nr(bio); |
294 | BUG_ON(target_bio_nr >= sc->stripes); | |
74d46992 | 295 | bio_set_dev(bio, sc->stripe[target_bio_nr].dev->bdev); |
374bf7e7 MP |
296 | return DM_MAPIO_REMAPPED; |
297 | } | |
e6047149 | 298 | if (unlikely(bio_op(bio) == REQ_OP_DISCARD) || |
00716545 | 299 | unlikely(bio_op(bio) == REQ_OP_SECURE_ERASE) || |
ac62d620 | 300 | unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES) || |
e6047149 | 301 | unlikely(bio_op(bio) == REQ_OP_WRITE_SAME)) { |
55a62eef AK |
302 | target_bio_nr = dm_bio_get_target_bio_nr(bio); |
303 | BUG_ON(target_bio_nr >= sc->stripes); | |
304 | return stripe_map_range(sc, bio, target_bio_nr); | |
7b76ec11 | 305 | } |
374bf7e7 | 306 | |
4f024f37 KO |
307 | stripe_map_sector(sc, bio->bi_iter.bi_sector, |
308 | &stripe, &bio->bi_iter.bi_sector); | |
1da177e4 | 309 | |
4f024f37 | 310 | bio->bi_iter.bi_sector += sc->stripe[stripe].physical_start; |
74d46992 | 311 | bio_set_dev(bio, sc->stripe[stripe].dev->bdev); |
65988525 | 312 | |
d2a7ad29 | 313 | return DM_MAPIO_REMAPPED; |
1da177e4 LT |
314 | } |
315 | ||
976431b0 | 316 | #if IS_ENABLED(CONFIG_DAX_DRIVER) |
817bf402 DW |
317 | static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, |
318 | long nr_pages, void **kaddr, pfn_t *pfn) | |
beec25b4 | 319 | { |
817bf402 | 320 | sector_t dev_sector, sector = pgoff * PAGE_SECTORS; |
beec25b4 | 321 | struct stripe_c *sc = ti->private; |
817bf402 | 322 | struct dax_device *dax_dev; |
beec25b4 | 323 | struct block_device *bdev; |
817bf402 | 324 | uint32_t stripe; |
beec25b4 TK |
325 | long ret; |
326 | ||
817bf402 DW |
327 | stripe_map_sector(sc, sector, &stripe, &dev_sector); |
328 | dev_sector += sc->stripe[stripe].physical_start; | |
329 | dax_dev = sc->stripe[stripe].dev->dax_dev; | |
beec25b4 TK |
330 | bdev = sc->stripe[stripe].dev->bdev; |
331 | ||
817bf402 DW |
332 | ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff); |
333 | if (ret) | |
334 | return ret; | |
335 | return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn); | |
beec25b4 TK |
336 | } |
337 | ||
7e026c8c DW |
338 | static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, |
339 | void *addr, size_t bytes, struct iov_iter *i) | |
340 | { | |
341 | sector_t dev_sector, sector = pgoff * PAGE_SECTORS; | |
342 | struct stripe_c *sc = ti->private; | |
343 | struct dax_device *dax_dev; | |
344 | struct block_device *bdev; | |
345 | uint32_t stripe; | |
346 | ||
347 | stripe_map_sector(sc, sector, &stripe, &dev_sector); | |
348 | dev_sector += sc->stripe[stripe].physical_start; | |
349 | dax_dev = sc->stripe[stripe].dev->dax_dev; | |
350 | bdev = sc->stripe[stripe].dev->bdev; | |
351 | ||
352 | if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) | |
353 | return 0; | |
354 | return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); | |
355 | } | |
356 | ||
b3a9a0c3 DW |
357 | static size_t stripe_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, |
358 | void *addr, size_t bytes, struct iov_iter *i) | |
359 | { | |
360 | sector_t dev_sector, sector = pgoff * PAGE_SECTORS; | |
361 | struct stripe_c *sc = ti->private; | |
362 | struct dax_device *dax_dev; | |
363 | struct block_device *bdev; | |
364 | uint32_t stripe; | |
365 | ||
366 | stripe_map_sector(sc, sector, &stripe, &dev_sector); | |
367 | dev_sector += sc->stripe[stripe].physical_start; | |
368 | dax_dev = sc->stripe[stripe].dev->dax_dev; | |
369 | bdev = sc->stripe[stripe].dev->bdev; | |
370 | ||
371 | if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) | |
372 | return 0; | |
373 | return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); | |
374 | } | |
375 | ||
976431b0 DW |
376 | #else |
377 | #define stripe_dax_direct_access NULL | |
378 | #define stripe_dax_copy_from_iter NULL | |
b3a9a0c3 | 379 | #define stripe_dax_copy_to_iter NULL |
976431b0 DW |
380 | #endif |
381 | ||
4f7f5c67 BW |
382 | /* |
383 | * Stripe status: | |
384 | * | |
385 | * INFO | |
386 | * #stripes [stripe_name <stripe_name>] [group word count] | |
387 | * [error count 'A|D' <error count 'A|D'>] | |
388 | * | |
389 | * TABLE | |
390 | * #stripes [stripe chunk size] | |
391 | * [stripe_name physical_start <stripe_name physical_start>] | |
392 | * | |
393 | */ | |
394 | ||
fd7c092e MP |
395 | static void stripe_status(struct dm_target *ti, status_type_t type, |
396 | unsigned status_flags, char *result, unsigned maxlen) | |
1da177e4 LT |
397 | { |
398 | struct stripe_c *sc = (struct stripe_c *) ti->private; | |
399 | unsigned int sz = 0; | |
400 | unsigned int i; | |
401 | ||
402 | switch (type) { | |
403 | case STATUSTYPE_INFO: | |
4f7f5c67 BW |
404 | DMEMIT("%d ", sc->stripes); |
405 | for (i = 0; i < sc->stripes; i++) { | |
406 | DMEMIT("%s ", sc->stripe[i].dev->name); | |
4f7f5c67 | 407 | } |
706dd22f TA |
408 | DMEMIT("1 "); |
409 | for (i = 0; i < sc->stripes; i++) { | |
410 | DMEMIT("%c", atomic_read(&(sc->stripe[i].error_count)) ? | |
411 | 'D' : 'A'); | |
412 | } | |
1da177e4 LT |
413 | break; |
414 | ||
415 | case STATUSTYPE_TABLE: | |
4ee218cd | 416 | DMEMIT("%d %llu", sc->stripes, |
eb850de6 | 417 | (unsigned long long)sc->chunk_size); |
1da177e4 | 418 | for (i = 0; i < sc->stripes; i++) |
4ee218cd AM |
419 | DMEMIT(" %s %llu", sc->stripe[i].dev->name, |
420 | (unsigned long long)sc->stripe[i].physical_start); | |
1da177e4 LT |
421 | break; |
422 | } | |
1da177e4 LT |
423 | } |
424 | ||
4e4cbee9 CH |
425 | static int stripe_end_io(struct dm_target *ti, struct bio *bio, |
426 | blk_status_t *error) | |
a25eb944 BW |
427 | { |
428 | unsigned i; | |
429 | char major_minor[16]; | |
430 | struct stripe_c *sc = ti->private; | |
431 | ||
1be56909 CH |
432 | if (!*error) |
433 | return DM_ENDIO_DONE; /* I/O complete */ | |
a25eb944 | 434 | |
9966afaf | 435 | if (bio->bi_opf & REQ_RAHEAD) |
1be56909 | 436 | return DM_ENDIO_DONE; |
a25eb944 | 437 | |
4e4cbee9 | 438 | if (*error == BLK_STS_NOTSUPP) |
1be56909 | 439 | return DM_ENDIO_DONE; |
a25eb944 BW |
440 | |
441 | memset(major_minor, 0, sizeof(major_minor)); | |
74d46992 | 442 | sprintf(major_minor, "%d:%d", MAJOR(bio_dev(bio)), MINOR(bio_dev(bio))); |
a25eb944 BW |
443 | |
444 | /* | |
445 | * Test to see which stripe drive triggered the event | |
446 | * and increment error count for all stripes on that device. | |
447 | * If the error count for a given device exceeds the threshold | |
448 | * value we will no longer trigger any further events. | |
449 | */ | |
450 | for (i = 0; i < sc->stripes; i++) | |
451 | if (!strcmp(sc->stripe[i].dev->name, major_minor)) { | |
452 | atomic_inc(&(sc->stripe[i].error_count)); | |
453 | if (atomic_read(&(sc->stripe[i].error_count)) < | |
454 | DM_IO_ERROR_THRESHOLD) | |
f521f074 | 455 | schedule_work(&sc->trigger_event); |
a25eb944 BW |
456 | } |
457 | ||
1be56909 | 458 | return DM_ENDIO_DONE; |
a25eb944 BW |
459 | } |
460 | ||
af4874e0 MS |
461 | static int stripe_iterate_devices(struct dm_target *ti, |
462 | iterate_devices_callout_fn fn, void *data) | |
463 | { | |
464 | struct stripe_c *sc = ti->private; | |
465 | int ret = 0; | |
466 | unsigned i = 0; | |
467 | ||
5dea271b | 468 | do { |
af4874e0 | 469 | ret = fn(ti, sc->stripe[i].dev, |
5dea271b MS |
470 | sc->stripe[i].physical_start, |
471 | sc->stripe_width, data); | |
472 | } while (!ret && ++i < sc->stripes); | |
af4874e0 MS |
473 | |
474 | return ret; | |
475 | } | |
476 | ||
40bea431 MS |
477 | static void stripe_io_hints(struct dm_target *ti, |
478 | struct queue_limits *limits) | |
479 | { | |
480 | struct stripe_c *sc = ti->private; | |
eb850de6 | 481 | unsigned chunk_size = sc->chunk_size << SECTOR_SHIFT; |
40bea431 MS |
482 | |
483 | blk_limits_io_min(limits, chunk_size); | |
3c5820c7 | 484 | blk_limits_io_opt(limits, chunk_size * sc->stripes); |
40bea431 MS |
485 | } |
486 | ||
1da177e4 LT |
487 | static struct target_type stripe_target = { |
488 | .name = "striped", | |
beec25b4 | 489 | .version = {1, 6, 0}, |
e2460f2a | 490 | .features = DM_TARGET_PASSES_INTEGRITY, |
1da177e4 LT |
491 | .module = THIS_MODULE, |
492 | .ctr = stripe_ctr, | |
493 | .dtr = stripe_dtr, | |
494 | .map = stripe_map, | |
a25eb944 | 495 | .end_io = stripe_end_io, |
1da177e4 | 496 | .status = stripe_status, |
af4874e0 | 497 | .iterate_devices = stripe_iterate_devices, |
40bea431 | 498 | .io_hints = stripe_io_hints, |
817bf402 | 499 | .direct_access = stripe_dax_direct_access, |
7e026c8c | 500 | .dax_copy_from_iter = stripe_dax_copy_from_iter, |
b3a9a0c3 | 501 | .dax_copy_to_iter = stripe_dax_copy_to_iter, |
1da177e4 LT |
502 | }; |
503 | ||
504 | int __init dm_stripe_init(void) | |
505 | { | |
506 | int r; | |
507 | ||
508 | r = dm_register_target(&stripe_target); | |
e223e1de | 509 | if (r < 0) |
72d94861 | 510 | DMWARN("target registration failed"); |
1da177e4 LT |
511 | |
512 | return r; | |
513 | } | |
514 | ||
515 | void dm_stripe_exit(void) | |
516 | { | |
10d3bd09 | 517 | dm_unregister_target(&stripe_target); |
1da177e4 | 518 | } |