Commit | Line | Data |
---|---|---|
3bd94003 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2003 Sistina Software | |
891ce207 | 4 | * Copyright (C) 2006 Red Hat GmbH |
1da177e4 LT |
5 | * |
6 | * This file is released under the GPL. | |
7 | */ | |
8 | ||
4cc96131 | 9 | #include "dm-core.h" |
952b3557 | 10 | |
586e80e6 | 11 | #include <linux/device-mapper.h> |
1da177e4 LT |
12 | |
13 | #include <linux/bio.h> | |
10f1d5d1 | 14 | #include <linux/completion.h> |
1da177e4 LT |
15 | #include <linux/mempool.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/slab.h> | |
a765e20e | 19 | #include <linux/dm-io.h> |
1da177e4 | 20 | |
f1e53987 MP |
21 | #define DM_MSG_PREFIX "io" |
22 | ||
23 | #define DM_IO_MAX_REGIONS BITS_PER_LONG | |
24 | ||
891ce207 | 25 | struct dm_io_client { |
6f1c819c KO |
26 | mempool_t pool; |
27 | struct bio_set bios; | |
891ce207 HM |
28 | }; |
29 | ||
f1e53987 MP |
30 | /* |
31 | * Aligning 'struct io' reduces the number of bits required to store | |
32 | * its address. Refer to store_io_and_region_in_bio() below. | |
33 | */ | |
1da177e4 | 34 | struct io { |
e01fd7ee | 35 | unsigned long error_bits; |
1da177e4 | 36 | atomic_t count; |
891ce207 | 37 | struct dm_io_client *client; |
1da177e4 LT |
38 | io_notify_fn callback; |
39 | void *context; | |
bb91bc7b MP |
40 | void *vma_invalidate_address; |
41 | unsigned long vma_invalidate_size; | |
f8922a48 | 42 | } __aligned(DM_IO_MAX_REGIONS); |
1da177e4 | 43 | |
952b3557 MP |
44 | static struct kmem_cache *_dm_io_cache; |
45 | ||
c8b03afe HM |
46 | /* |
47 | * Create a client with mempool and bioset. | |
48 | */ | |
bda8efec | 49 | struct dm_io_client *dm_io_client_create(void) |
c8b03afe | 50 | { |
c8b03afe | 51 | struct dm_io_client *client; |
86a3238c | 52 | unsigned int min_ios = dm_get_reserved_bio_based_ios(); |
6f1c819c | 53 | int ret; |
c8b03afe | 54 | |
d3775354 | 55 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
c8b03afe HM |
56 | if (!client) |
57 | return ERR_PTR(-ENOMEM); | |
58 | ||
6f1c819c KO |
59 | ret = mempool_init_slab_pool(&client->pool, min_ios, _dm_io_cache); |
60 | if (ret) | |
c8b03afe HM |
61 | goto bad; |
62 | ||
6f1c819c KO |
63 | ret = bioset_init(&client->bios, min_ios, 0, BIOSET_NEED_BVECS); |
64 | if (ret) | |
c8b03afe HM |
65 | goto bad; |
66 | ||
67 | return client; | |
68 | ||
69 | bad: | |
6f1c819c | 70 | mempool_exit(&client->pool); |
c8b03afe | 71 | kfree(client); |
6f1c819c | 72 | return ERR_PTR(ret); |
c8b03afe HM |
73 | } |
74 | EXPORT_SYMBOL(dm_io_client_create); | |
75 | ||
c8b03afe HM |
76 | void dm_io_client_destroy(struct dm_io_client *client) |
77 | { | |
6f1c819c KO |
78 | mempool_exit(&client->pool); |
79 | bioset_exit(&client->bios); | |
c8b03afe HM |
80 | kfree(client); |
81 | } | |
82 | EXPORT_SYMBOL(dm_io_client_destroy); | |
83 | ||
a4a82ce3 HM |
84 | /* |
85 | *------------------------------------------------------------------- | |
1da177e4 | 86 | * We need to keep track of which region a bio is doing io for. |
f1e53987 MP |
87 | * To avoid a memory allocation to store just 5 or 6 bits, we |
88 | * ensure the 'struct io' pointer is aligned so enough low bits are | |
89 | * always zero and then combine it with the region number directly in | |
90 | * bi_private. | |
a4a82ce3 HM |
91 | *------------------------------------------------------------------- |
92 | */ | |
f1e53987 | 93 | static void store_io_and_region_in_bio(struct bio *bio, struct io *io, |
86a3238c | 94 | unsigned int region) |
1da177e4 | 95 | { |
f1e53987 MP |
96 | if (unlikely(!IS_ALIGNED((unsigned long)io, DM_IO_MAX_REGIONS))) { |
97 | DMCRIT("Unaligned struct io pointer %p", io); | |
98 | BUG(); | |
99 | } | |
100 | ||
101 | bio->bi_private = (void *)((unsigned long)io | region); | |
1da177e4 LT |
102 | } |
103 | ||
f1e53987 | 104 | static void retrieve_io_and_region_from_bio(struct bio *bio, struct io **io, |
86a3238c | 105 | unsigned int *region) |
1da177e4 | 106 | { |
f1e53987 MP |
107 | unsigned long val = (unsigned long)bio->bi_private; |
108 | ||
109 | *io = (void *)(val & -(unsigned long)DM_IO_MAX_REGIONS); | |
110 | *region = val & (DM_IO_MAX_REGIONS - 1); | |
1da177e4 LT |
111 | } |
112 | ||
a4a82ce3 HM |
113 | /* |
114 | *-------------------------------------------------------------- | |
1da177e4 LT |
115 | * We need an io object to keep track of the number of bios that |
116 | * have been dispatched for a particular io. | |
a4a82ce3 HM |
117 | *-------------------------------------------------------------- |
118 | */ | |
97e7cdf1 | 119 | static void complete_io(struct io *io) |
1da177e4 | 120 | { |
97e7cdf1 JT |
121 | unsigned long error_bits = io->error_bits; |
122 | io_notify_fn fn = io->callback; | |
123 | void *context = io->context; | |
1da177e4 | 124 | |
97e7cdf1 JT |
125 | if (io->vma_invalidate_size) |
126 | invalidate_kernel_vmap_range(io->vma_invalidate_address, | |
127 | io->vma_invalidate_size); | |
bb91bc7b | 128 | |
6f1c819c | 129 | mempool_free(io, &io->client->pool); |
97e7cdf1 JT |
130 | fn(error_bits, context); |
131 | } | |
1da177e4 | 132 | |
4e4cbee9 | 133 | static void dec_count(struct io *io, unsigned int region, blk_status_t error) |
97e7cdf1 JT |
134 | { |
135 | if (error) | |
136 | set_bit(region, &io->error_bits); | |
1da177e4 | 137 | |
97e7cdf1 JT |
138 | if (atomic_dec_and_test(&io->count)) |
139 | complete_io(io); | |
1da177e4 LT |
140 | } |
141 | ||
4246a0b6 | 142 | static void endio(struct bio *bio) |
1da177e4 | 143 | { |
c897feb3 | 144 | struct io *io; |
86a3238c | 145 | unsigned int region; |
4e4cbee9 | 146 | blk_status_t error; |
1da177e4 | 147 | |
4e4cbee9 | 148 | if (bio->bi_status && bio_data_dir(bio) == READ) |
1da177e4 LT |
149 | zero_fill_bio(bio); |
150 | ||
c897feb3 HM |
151 | /* |
152 | * The bio destructor in bio_put() may use the io object. | |
153 | */ | |
f1e53987 | 154 | retrieve_io_and_region_from_bio(bio, &io, ®ion); |
c897feb3 | 155 | |
4e4cbee9 | 156 | error = bio->bi_status; |
1da177e4 LT |
157 | bio_put(bio); |
158 | ||
9b81c842 | 159 | dec_count(io, region, error); |
1da177e4 LT |
160 | } |
161 | ||
a4a82ce3 HM |
162 | /* |
163 | *-------------------------------------------------------------- | |
1da177e4 LT |
164 | * These little objects provide an abstraction for getting a new |
165 | * destination page for io. | |
a4a82ce3 HM |
166 | *-------------------------------------------------------------- |
167 | */ | |
1da177e4 LT |
168 | struct dpages { |
169 | void (*get_page)(struct dpages *dp, | |
86a3238c | 170 | struct page **p, unsigned long *len, unsigned int *offset); |
1da177e4 LT |
171 | void (*next_page)(struct dpages *dp); |
172 | ||
cacc7b05 | 173 | union { |
86a3238c | 174 | unsigned int context_u; |
cacc7b05 ML |
175 | struct bvec_iter context_bi; |
176 | }; | |
1da177e4 | 177 | void *context_ptr; |
bb91bc7b MP |
178 | |
179 | void *vma_invalidate_address; | |
180 | unsigned long vma_invalidate_size; | |
1da177e4 LT |
181 | }; |
182 | ||
183 | /* | |
184 | * Functions for getting the pages from a list. | |
185 | */ | |
186 | static void list_get_page(struct dpages *dp, | |
86a3238c | 187 | struct page **p, unsigned long *len, unsigned int *offset) |
1da177e4 | 188 | { |
86a3238c | 189 | unsigned int o = dp->context_u; |
1da177e4 LT |
190 | struct page_list *pl = (struct page_list *) dp->context_ptr; |
191 | ||
192 | *p = pl->page; | |
193 | *len = PAGE_SIZE - o; | |
194 | *offset = o; | |
195 | } | |
196 | ||
197 | static void list_next_page(struct dpages *dp) | |
198 | { | |
199 | struct page_list *pl = (struct page_list *) dp->context_ptr; | |
0ef0b471 | 200 | |
1da177e4 LT |
201 | dp->context_ptr = pl->next; |
202 | dp->context_u = 0; | |
203 | } | |
204 | ||
86a3238c | 205 | static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned int offset) |
1da177e4 LT |
206 | { |
207 | dp->get_page = list_get_page; | |
208 | dp->next_page = list_next_page; | |
209 | dp->context_u = offset; | |
210 | dp->context_ptr = pl; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Functions for getting the pages from a bvec. | |
215 | */ | |
d73f9907 | 216 | static void bio_get_page(struct dpages *dp, struct page **p, |
86a3238c | 217 | unsigned long *len, unsigned int *offset) |
1da177e4 | 218 | { |
cacc7b05 ML |
219 | struct bio_vec bvec = bvec_iter_bvec((struct bio_vec *)dp->context_ptr, |
220 | dp->context_bi); | |
221 | ||
222 | *p = bvec.bv_page; | |
223 | *len = bvec.bv_len; | |
224 | *offset = bvec.bv_offset; | |
225 | ||
226 | /* avoid figuring it out again in bio_next_page() */ | |
227 | dp->context_bi.bi_sector = (sector_t)bvec.bv_len; | |
1da177e4 LT |
228 | } |
229 | ||
003b5c57 | 230 | static void bio_next_page(struct dpages *dp) |
1da177e4 | 231 | { |
cacc7b05 ML |
232 | unsigned int len = (unsigned int)dp->context_bi.bi_sector; |
233 | ||
234 | bvec_iter_advance((struct bio_vec *)dp->context_ptr, | |
235 | &dp->context_bi, len); | |
1da177e4 LT |
236 | } |
237 | ||
003b5c57 | 238 | static void bio_dp_init(struct dpages *dp, struct bio *bio) |
1da177e4 | 239 | { |
003b5c57 KO |
240 | dp->get_page = bio_get_page; |
241 | dp->next_page = bio_next_page; | |
cacc7b05 ML |
242 | |
243 | /* | |
244 | * We just use bvec iterator to retrieve pages, so it is ok to | |
245 | * access the bvec table directly here | |
246 | */ | |
247 | dp->context_ptr = bio->bi_io_vec; | |
248 | dp->context_bi = bio->bi_iter; | |
1da177e4 LT |
249 | } |
250 | ||
c8b03afe HM |
251 | /* |
252 | * Functions for getting the pages from a VMA. | |
253 | */ | |
1da177e4 | 254 | static void vm_get_page(struct dpages *dp, |
86a3238c | 255 | struct page **p, unsigned long *len, unsigned int *offset) |
1da177e4 LT |
256 | { |
257 | *p = vmalloc_to_page(dp->context_ptr); | |
258 | *offset = dp->context_u; | |
259 | *len = PAGE_SIZE - dp->context_u; | |
260 | } | |
261 | ||
262 | static void vm_next_page(struct dpages *dp) | |
263 | { | |
264 | dp->context_ptr += PAGE_SIZE - dp->context_u; | |
265 | dp->context_u = 0; | |
266 | } | |
267 | ||
268 | static void vm_dp_init(struct dpages *dp, void *data) | |
269 | { | |
270 | dp->get_page = vm_get_page; | |
271 | dp->next_page = vm_next_page; | |
93bbf583 | 272 | dp->context_u = offset_in_page(data); |
1da177e4 LT |
273 | dp->context_ptr = data; |
274 | } | |
275 | ||
c8b03afe HM |
276 | /* |
277 | * Functions for getting the pages from kernel memory. | |
278 | */ | |
279 | static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len, | |
86a3238c | 280 | unsigned int *offset) |
c8b03afe HM |
281 | { |
282 | *p = virt_to_page(dp->context_ptr); | |
283 | *offset = dp->context_u; | |
284 | *len = PAGE_SIZE - dp->context_u; | |
285 | } | |
286 | ||
287 | static void km_next_page(struct dpages *dp) | |
288 | { | |
289 | dp->context_ptr += PAGE_SIZE - dp->context_u; | |
290 | dp->context_u = 0; | |
291 | } | |
292 | ||
293 | static void km_dp_init(struct dpages *dp, void *data) | |
294 | { | |
295 | dp->get_page = km_get_page; | |
296 | dp->next_page = km_next_page; | |
93bbf583 | 297 | dp->context_u = offset_in_page(data); |
c8b03afe HM |
298 | dp->context_ptr = data; |
299 | } | |
300 | ||
a4a82ce3 HM |
301 | /* |
302 | *--------------------------------------------------------------- | |
1da177e4 | 303 | * IO routines that accept a list of pages. |
a4a82ce3 HM |
304 | *--------------------------------------------------------------- |
305 | */ | |
86a3238c | 306 | static void do_region(const blk_opf_t opf, unsigned int region, |
e6047149 MC |
307 | struct dm_io_region *where, struct dpages *dp, |
308 | struct io *io) | |
1da177e4 LT |
309 | { |
310 | struct bio *bio; | |
311 | struct page *page; | |
312 | unsigned long len; | |
86a3238c HM |
313 | unsigned int offset; |
314 | unsigned int num_bvecs; | |
1da177e4 | 315 | sector_t remaining = where->count; |
0c535e0d | 316 | struct request_queue *q = bdev_get_queue(where->bdev); |
70d6c400 | 317 | sector_t num_sectors; |
3f649ab7 | 318 | unsigned int special_cmd_max_sectors; |
a3282b43 | 319 | const enum req_op op = opf & REQ_OP_MASK; |
1da177e4 | 320 | |
e5db2980 DW |
321 | /* |
322 | * Reject unsupported discard and write same requests. | |
323 | */ | |
e6047149 | 324 | if (op == REQ_OP_DISCARD) |
cf0fbf89 | 325 | special_cmd_max_sectors = bdev_max_discard_sectors(where->bdev); |
ac62d620 CH |
326 | else if (op == REQ_OP_WRITE_ZEROES) |
327 | special_cmd_max_sectors = q->limits.max_write_zeroes_sectors; | |
a773187e CH |
328 | if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) && |
329 | special_cmd_max_sectors == 0) { | |
feb7695f | 330 | atomic_inc(&io->count); |
4e4cbee9 | 331 | dec_count(io, region, BLK_STS_NOTSUPP); |
37527b86 DW |
332 | return; |
333 | } | |
334 | ||
12fc0f49 | 335 | /* |
e6047149 | 336 | * where->count may be zero if op holds a flush and we need to |
d87f4c14 | 337 | * send a zero-sized flush. |
12fc0f49 MP |
338 | */ |
339 | do { | |
1da177e4 | 340 | /* |
f1e53987 | 341 | * Allocate a suitably sized-bio. |
1da177e4 | 342 | */ |
0f5d690f CH |
343 | switch (op) { |
344 | case REQ_OP_DISCARD: | |
ac62d620 | 345 | case REQ_OP_WRITE_ZEROES: |
0f5d690f CH |
346 | num_bvecs = 0; |
347 | break; | |
0f5d690f | 348 | default: |
5f7136db MWO |
349 | num_bvecs = bio_max_segs(dm_sector_div_up(remaining, |
350 | (PAGE_SIZE >> SECTOR_SHIFT))); | |
0f5d690f | 351 | } |
0c535e0d | 352 | |
a3282b43 BVA |
353 | bio = bio_alloc_bioset(where->bdev, num_bvecs, opf, GFP_NOIO, |
354 | &io->client->bios); | |
4f024f37 | 355 | bio->bi_iter.bi_sector = where->sector + (where->count - remaining); |
1da177e4 | 356 | bio->bi_end_io = endio; |
f1e53987 | 357 | store_io_and_region_in_bio(bio, io, region); |
1da177e4 | 358 | |
ac62d620 | 359 | if (op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) { |
e5db2980 | 360 | num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining); |
4f024f37 | 361 | bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT; |
70d6c400 | 362 | remaining -= num_sectors; |
03b18887 HM |
363 | } else { |
364 | while (remaining) { | |
365 | /* | |
366 | * Try and add as many pages as possible. | |
367 | */ | |
368 | dp->get_page(dp, &page, &len, &offset); | |
369 | len = min(len, to_bytes(remaining)); | |
370 | if (!bio_add_page(bio, page, len, offset)) | |
371 | break; | |
372 | ||
373 | offset = 0; | |
374 | remaining -= to_sector(len); | |
375 | dp->next_page(dp); | |
376 | } | |
1da177e4 LT |
377 | } |
378 | ||
379 | atomic_inc(&io->count); | |
4e49ea4a | 380 | submit_bio(bio); |
12fc0f49 | 381 | } while (remaining); |
1da177e4 LT |
382 | } |
383 | ||
a3282b43 | 384 | static void dispatch_io(blk_opf_t opf, unsigned int num_regions, |
22a1ceb1 | 385 | struct dm_io_region *where, struct dpages *dp, |
1da177e4 LT |
386 | struct io *io, int sync) |
387 | { | |
388 | int i; | |
389 | struct dpages old_pages = *dp; | |
390 | ||
f1e53987 MP |
391 | BUG_ON(num_regions > DM_IO_MAX_REGIONS); |
392 | ||
1da177e4 | 393 | if (sync) |
a3282b43 | 394 | opf |= REQ_SYNC; |
1da177e4 LT |
395 | |
396 | /* | |
397 | * For multiple regions we need to be careful to rewind | |
398 | * the dp object for each call to do_region. | |
399 | */ | |
400 | for (i = 0; i < num_regions; i++) { | |
401 | *dp = old_pages; | |
a3282b43 BVA |
402 | if (where[i].count || (opf & REQ_PREFLUSH)) |
403 | do_region(opf, i, where + i, dp, io); | |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
f00b16ad | 407 | * Drop the extra reference that we were holding to avoid |
1da177e4 LT |
408 | * the io being completed too early. |
409 | */ | |
410 | dec_count(io, 0, 0); | |
411 | } | |
412 | ||
97e7cdf1 JT |
413 | struct sync_io { |
414 | unsigned long error_bits; | |
415 | struct completion wait; | |
416 | }; | |
417 | ||
418 | static void sync_io_complete(unsigned long error, void *context) | |
419 | { | |
420 | struct sync_io *sio = context; | |
421 | ||
422 | sio->error_bits = error; | |
423 | complete(&sio->wait); | |
424 | } | |
425 | ||
891ce207 | 426 | static int sync_io(struct dm_io_client *client, unsigned int num_regions, |
a3282b43 BVA |
427 | struct dm_io_region *where, blk_opf_t opf, struct dpages *dp, |
428 | unsigned long *error_bits) | |
1da177e4 | 429 | { |
97e7cdf1 JT |
430 | struct io *io; |
431 | struct sync_io sio; | |
1da177e4 | 432 | |
a3282b43 | 433 | if (num_regions > 1 && !op_is_write(opf)) { |
1da177e4 LT |
434 | WARN_ON(1); |
435 | return -EIO; | |
436 | } | |
437 | ||
97e7cdf1 JT |
438 | init_completion(&sio.wait); |
439 | ||
6f1c819c | 440 | io = mempool_alloc(&client->pool, GFP_NOIO); |
f1e53987 | 441 | io->error_bits = 0; |
f1e53987 | 442 | atomic_set(&io->count, 1); /* see dispatch_io() */ |
f1e53987 | 443 | io->client = client; |
97e7cdf1 JT |
444 | io->callback = sync_io_complete; |
445 | io->context = &sio; | |
1da177e4 | 446 | |
bb91bc7b MP |
447 | io->vma_invalidate_address = dp->vma_invalidate_address; |
448 | io->vma_invalidate_size = dp->vma_invalidate_size; | |
449 | ||
a3282b43 | 450 | dispatch_io(opf, num_regions, where, dp, io, 1); |
1da177e4 | 451 | |
97e7cdf1 | 452 | wait_for_completion_io(&sio.wait); |
1da177e4 | 453 | |
891ce207 | 454 | if (error_bits) |
97e7cdf1 | 455 | *error_bits = sio.error_bits; |
891ce207 | 456 | |
97e7cdf1 | 457 | return sio.error_bits ? -EIO : 0; |
1da177e4 LT |
458 | } |
459 | ||
891ce207 | 460 | static int async_io(struct dm_io_client *client, unsigned int num_regions, |
a3282b43 | 461 | struct dm_io_region *where, blk_opf_t opf, |
e6047149 | 462 | struct dpages *dp, io_notify_fn fn, void *context) |
1da177e4 LT |
463 | { |
464 | struct io *io; | |
465 | ||
a3282b43 | 466 | if (num_regions > 1 && !op_is_write(opf)) { |
1da177e4 LT |
467 | WARN_ON(1); |
468 | fn(1, context); | |
469 | return -EIO; | |
470 | } | |
471 | ||
6f1c819c | 472 | io = mempool_alloc(&client->pool, GFP_NOIO); |
e01fd7ee | 473 | io->error_bits = 0; |
1da177e4 | 474 | atomic_set(&io->count, 1); /* see dispatch_io() */ |
891ce207 | 475 | io->client = client; |
1da177e4 LT |
476 | io->callback = fn; |
477 | io->context = context; | |
478 | ||
bb91bc7b MP |
479 | io->vma_invalidate_address = dp->vma_invalidate_address; |
480 | io->vma_invalidate_size = dp->vma_invalidate_size; | |
481 | ||
a3282b43 | 482 | dispatch_io(opf, num_regions, where, dp, io, 0); |
1da177e4 LT |
483 | return 0; |
484 | } | |
485 | ||
bb91bc7b MP |
486 | static int dp_init(struct dm_io_request *io_req, struct dpages *dp, |
487 | unsigned long size) | |
c8b03afe HM |
488 | { |
489 | /* Set up dpages based on memory type */ | |
bb91bc7b MP |
490 | |
491 | dp->vma_invalidate_address = NULL; | |
492 | dp->vma_invalidate_size = 0; | |
493 | ||
c8b03afe HM |
494 | switch (io_req->mem.type) { |
495 | case DM_IO_PAGE_LIST: | |
496 | list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset); | |
497 | break; | |
498 | ||
003b5c57 KO |
499 | case DM_IO_BIO: |
500 | bio_dp_init(dp, io_req->mem.ptr.bio); | |
c8b03afe HM |
501 | break; |
502 | ||
503 | case DM_IO_VMA: | |
bb91bc7b | 504 | flush_kernel_vmap_range(io_req->mem.ptr.vma, size); |
581075e4 | 505 | if ((io_req->bi_opf & REQ_OP_MASK) == REQ_OP_READ) { |
bb91bc7b MP |
506 | dp->vma_invalidate_address = io_req->mem.ptr.vma; |
507 | dp->vma_invalidate_size = size; | |
508 | } | |
c8b03afe HM |
509 | vm_dp_init(dp, io_req->mem.ptr.vma); |
510 | break; | |
511 | ||
512 | case DM_IO_KMEM: | |
513 | km_dp_init(dp, io_req->mem.ptr.addr); | |
514 | break; | |
515 | ||
516 | default: | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
86a3238c | 523 | int dm_io(struct dm_io_request *io_req, unsigned int num_regions, |
22a1ceb1 | 524 | struct dm_io_region *where, unsigned long *sync_error_bits) |
c8b03afe HM |
525 | { |
526 | int r; | |
527 | struct dpages dp; | |
528 | ||
bb91bc7b | 529 | r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT); |
c8b03afe HM |
530 | if (r) |
531 | return r; | |
532 | ||
533 | if (!io_req->notify.fn) | |
534 | return sync_io(io_req->client, num_regions, where, | |
a3282b43 | 535 | io_req->bi_opf, &dp, sync_error_bits); |
c8b03afe | 536 | |
581075e4 | 537 | return async_io(io_req->client, num_regions, where, |
a3282b43 | 538 | io_req->bi_opf, &dp, io_req->notify.fn, |
e6047149 | 539 | io_req->notify.context); |
c8b03afe HM |
540 | } |
541 | EXPORT_SYMBOL(dm_io); | |
952b3557 MP |
542 | |
543 | int __init dm_io_init(void) | |
544 | { | |
545 | _dm_io_cache = KMEM_CACHE(io, 0); | |
546 | if (!_dm_io_cache) | |
547 | return -ENOMEM; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | void dm_io_exit(void) | |
553 | { | |
554 | kmem_cache_destroy(_dm_io_cache); | |
555 | _dm_io_cache = NULL; | |
556 | } |