Commit | Line | Data |
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7ba1ba12 MP |
1 | /* |
2 | * bio-integrity.c - bio data integrity extensions | |
3 | * | |
7878cba9 | 4 | * Copyright (C) 2007, 2008, 2009 Oracle Corporation |
7ba1ba12 MP |
5 | * Written by: Martin K. Petersen <martin.petersen@oracle.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; see the file COPYING. If not, write to | |
18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
19 | * USA. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/blkdev.h> | |
24 | #include <linux/mempool.h> | |
afeacc8c | 25 | #include <linux/export.h> |
7ba1ba12 MP |
26 | #include <linux/bio.h> |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
7ba1ba12 | 29 | |
9f060e22 | 30 | #define BIP_INLINE_VECS 4 |
7878cba9 | 31 | |
9f060e22 | 32 | static struct kmem_cache *bip_slab; |
7ba1ba12 MP |
33 | static struct workqueue_struct *kintegrityd_wq; |
34 | ||
5a48fc14 DW |
35 | void blk_flush_integrity(void) |
36 | { | |
37 | flush_workqueue(kintegrityd_wq); | |
38 | } | |
39 | ||
7ba1ba12 | 40 | /** |
1e2a410f | 41 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
7ba1ba12 MP |
42 | * @bio: bio to attach integrity metadata to |
43 | * @gfp_mask: Memory allocation mask | |
44 | * @nr_vecs: Number of integrity metadata scatter-gather elements | |
7ba1ba12 MP |
45 | * |
46 | * Description: This function prepares a bio for attaching integrity | |
47 | * metadata. nr_vecs specifies the maximum number of pages containing | |
48 | * integrity metadata that can be attached. | |
49 | */ | |
1e2a410f KO |
50 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
51 | gfp_t gfp_mask, | |
52 | unsigned int nr_vecs) | |
7ba1ba12 MP |
53 | { |
54 | struct bio_integrity_payload *bip; | |
1e2a410f | 55 | struct bio_set *bs = bio->bi_pool; |
9f060e22 KO |
56 | unsigned long idx = BIO_POOL_NONE; |
57 | unsigned inline_vecs; | |
58 | ||
bb8bd38b | 59 | if (!bs || !bs->bio_integrity_pool) { |
9f060e22 KO |
60 | bip = kmalloc(sizeof(struct bio_integrity_payload) + |
61 | sizeof(struct bio_vec) * nr_vecs, gfp_mask); | |
62 | inline_vecs = nr_vecs; | |
63 | } else { | |
7878cba9 | 64 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
9f060e22 | 65 | inline_vecs = BIP_INLINE_VECS; |
7ba1ba12 MP |
66 | } |
67 | ||
9f060e22 | 68 | if (unlikely(!bip)) |
06c1e390 | 69 | return ERR_PTR(-ENOMEM); |
9f060e22 | 70 | |
7878cba9 MP |
71 | memset(bip, 0, sizeof(*bip)); |
72 | ||
9f060e22 KO |
73 | if (nr_vecs > inline_vecs) { |
74 | bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, | |
75 | bs->bvec_integrity_pool); | |
76 | if (!bip->bip_vec) | |
77 | goto err; | |
cbcd1054 | 78 | bip->bip_max_vcnt = bvec_nr_vecs(idx); |
9f060e22 KO |
79 | } else { |
80 | bip->bip_vec = bip->bip_inline_vecs; | |
cbcd1054 | 81 | bip->bip_max_vcnt = inline_vecs; |
9f060e22 KO |
82 | } |
83 | ||
7878cba9 | 84 | bip->bip_slab = idx; |
7ba1ba12 MP |
85 | bip->bip_bio = bio; |
86 | bio->bi_integrity = bip; | |
180b2f95 | 87 | bio->bi_rw |= REQ_INTEGRITY; |
7ba1ba12 MP |
88 | |
89 | return bip; | |
9f060e22 KO |
90 | err: |
91 | mempool_free(bip, bs->bio_integrity_pool); | |
06c1e390 | 92 | return ERR_PTR(-ENOMEM); |
7ba1ba12 | 93 | } |
7ba1ba12 MP |
94 | EXPORT_SYMBOL(bio_integrity_alloc); |
95 | ||
96 | /** | |
97 | * bio_integrity_free - Free bio integrity payload | |
98 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
99 | * |
100 | * Description: Used to free the integrity portion of a bio. Usually | |
101 | * called from bio_free(). | |
102 | */ | |
1e2a410f | 103 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 | 104 | { |
180b2f95 | 105 | struct bio_integrity_payload *bip = bio_integrity(bio); |
1e2a410f KO |
106 | struct bio_set *bs = bio->bi_pool; |
107 | ||
b1f01388 | 108 | if (bip->bip_flags & BIP_BLOCK_INTEGRITY) |
5f9378fa MP |
109 | kfree(page_address(bip->bip_vec->bv_page) + |
110 | bip->bip_vec->bv_offset); | |
7ba1ba12 | 111 | |
bb8bd38b | 112 | if (bs && bs->bio_integrity_pool) { |
9f060e22 KO |
113 | if (bip->bip_slab != BIO_POOL_NONE) |
114 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, | |
115 | bip->bip_slab); | |
116 | ||
7878cba9 | 117 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
118 | } else { |
119 | kfree(bip); | |
120 | } | |
7ba1ba12 MP |
121 | |
122 | bio->bi_integrity = NULL; | |
123 | } | |
124 | EXPORT_SYMBOL(bio_integrity_free); | |
125 | ||
126 | /** | |
127 | * bio_integrity_add_page - Attach integrity metadata | |
128 | * @bio: bio to update | |
129 | * @page: page containing integrity metadata | |
130 | * @len: number of bytes of integrity metadata in page | |
131 | * @offset: start offset within page | |
132 | * | |
133 | * Description: Attach a page containing integrity metadata to bio. | |
134 | */ | |
135 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
136 | unsigned int len, unsigned int offset) | |
137 | { | |
180b2f95 | 138 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
139 | struct bio_vec *iv; |
140 | ||
cbcd1054 | 141 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
7ba1ba12 MP |
142 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
143 | return 0; | |
144 | } | |
145 | ||
d57a5f7c | 146 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 | 147 | |
87a816df SG |
148 | if (bip->bip_vcnt && |
149 | bvec_gap_to_prev(bdev_get_queue(bio->bi_bdev), | |
150 | &bip->bip_vec[bip->bip_vcnt - 1], offset)) | |
151 | return 0; | |
152 | ||
7ba1ba12 MP |
153 | iv->bv_page = page; |
154 | iv->bv_len = len; | |
155 | iv->bv_offset = offset; | |
156 | bip->bip_vcnt++; | |
157 | ||
158 | return len; | |
159 | } | |
160 | EXPORT_SYMBOL(bio_integrity_add_page); | |
161 | ||
162 | /** | |
163 | * bio_integrity_enabled - Check whether integrity can be passed | |
164 | * @bio: bio to check | |
165 | * | |
166 | * Description: Determines whether bio_integrity_prep() can be called | |
167 | * on this bio or not. bio data direction and target device must be | |
168 | * set prior to calling. The functions honors the write_generate and | |
169 | * read_verify flags in sysfs. | |
170 | */ | |
e7258c1a | 171 | bool bio_integrity_enabled(struct bio *bio) |
7ba1ba12 | 172 | { |
e7258c1a MP |
173 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
174 | ||
e69f18f0 | 175 | if (!bio_is_rw(bio)) |
e7258c1a | 176 | return false; |
e69f18f0 | 177 | |
7ba1ba12 MP |
178 | /* Already protected? */ |
179 | if (bio_integrity(bio)) | |
e7258c1a MP |
180 | return false; |
181 | ||
182 | if (bi == NULL) | |
183 | return false; | |
184 | ||
0f8087ec | 185 | if (bio_data_dir(bio) == READ && bi->profile->verify_fn != NULL && |
8288f496 | 186 | (bi->flags & BLK_INTEGRITY_VERIFY)) |
e7258c1a MP |
187 | return true; |
188 | ||
0f8087ec | 189 | if (bio_data_dir(bio) == WRITE && bi->profile->generate_fn != NULL && |
8288f496 | 190 | (bi->flags & BLK_INTEGRITY_GENERATE)) |
e7258c1a | 191 | return true; |
7ba1ba12 | 192 | |
e7258c1a | 193 | return false; |
7ba1ba12 MP |
194 | } |
195 | EXPORT_SYMBOL(bio_integrity_enabled); | |
196 | ||
197 | /** | |
3be91c4a | 198 | * bio_integrity_intervals - Return number of integrity intervals for a bio |
7ba1ba12 | 199 | * @bi: blk_integrity profile for device |
3be91c4a | 200 | * @sectors: Size of the bio in 512-byte sectors |
7ba1ba12 MP |
201 | * |
202 | * Description: The block layer calculates everything in 512 byte | |
3be91c4a MP |
203 | * sectors but integrity metadata is done in terms of the data integrity |
204 | * interval size of the storage device. Convert the block layer sectors | |
205 | * to the appropriate number of integrity intervals. | |
7ba1ba12 | 206 | */ |
3be91c4a MP |
207 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
208 | unsigned int sectors) | |
7ba1ba12 | 209 | { |
a48f041d | 210 | return sectors >> (bi->interval_exp - 9); |
7ba1ba12 MP |
211 | } |
212 | ||
d57a5f7c KO |
213 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
214 | unsigned int sectors) | |
215 | { | |
3be91c4a | 216 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
d57a5f7c KO |
217 | } |
218 | ||
7ba1ba12 | 219 | /** |
18593088 | 220 | * bio_integrity_process - Process integrity metadata for a bio |
bf36f9cf | 221 | * @bio: bio to generate/verify integrity metadata for |
18593088 | 222 | * @proc_fn: Pointer to the relevant processing function |
7ba1ba12 | 223 | */ |
18593088 MP |
224 | static int bio_integrity_process(struct bio *bio, |
225 | integrity_processing_fn *proc_fn) | |
7ba1ba12 MP |
226 | { |
227 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
18593088 | 228 | struct blk_integrity_iter iter; |
594416a7 DW |
229 | struct bvec_iter bviter; |
230 | struct bio_vec bv; | |
5f9378fa | 231 | struct bio_integrity_payload *bip = bio_integrity(bio); |
594416a7 | 232 | unsigned int ret = 0; |
5f9378fa MP |
233 | void *prot_buf = page_address(bip->bip_vec->bv_page) + |
234 | bip->bip_vec->bv_offset; | |
7ba1ba12 | 235 | |
18593088 | 236 | iter.disk_name = bio->bi_bdev->bd_disk->disk_name; |
a48f041d | 237 | iter.interval = 1 << bi->interval_exp; |
18593088 MP |
238 | iter.seed = bip_get_seed(bip); |
239 | iter.prot_buf = prot_buf; | |
7ba1ba12 | 240 | |
594416a7 DW |
241 | bio_for_each_segment(bv, bio, bviter) { |
242 | void *kaddr = kmap_atomic(bv.bv_page); | |
7ba1ba12 | 243 | |
594416a7 DW |
244 | iter.data_buf = kaddr + bv.bv_offset; |
245 | iter.data_size = bv.bv_len; | |
18593088 MP |
246 | |
247 | ret = proc_fn(&iter); | |
248 | if (ret) { | |
249 | kunmap_atomic(kaddr); | |
250 | return ret; | |
251 | } | |
7ba1ba12 | 252 | |
e8e3c3d6 | 253 | kunmap_atomic(kaddr); |
7ba1ba12 | 254 | } |
bf36f9cf GZ |
255 | return ret; |
256 | } | |
257 | ||
7ba1ba12 MP |
258 | /** |
259 | * bio_integrity_prep - Prepare bio for integrity I/O | |
260 | * @bio: bio to prepare | |
261 | * | |
262 | * Description: Allocates a buffer for integrity metadata, maps the | |
263 | * pages and attaches them to a bio. The bio must have data | |
264 | * direction, target device and start sector set priot to calling. In | |
265 | * the WRITE case, integrity metadata will be generated using the | |
266 | * block device's integrity function. In the READ case, the buffer | |
267 | * will be prepared for DMA and a suitable end_io handler set up. | |
268 | */ | |
269 | int bio_integrity_prep(struct bio *bio) | |
270 | { | |
271 | struct bio_integrity_payload *bip; | |
272 | struct blk_integrity *bi; | |
273 | struct request_queue *q; | |
274 | void *buf; | |
275 | unsigned long start, end; | |
276 | unsigned int len, nr_pages; | |
277 | unsigned int bytes, offset, i; | |
3be91c4a | 278 | unsigned int intervals; |
7ba1ba12 MP |
279 | |
280 | bi = bdev_get_integrity(bio->bi_bdev); | |
281 | q = bdev_get_queue(bio->bi_bdev); | |
282 | BUG_ON(bi == NULL); | |
283 | BUG_ON(bio_integrity(bio)); | |
284 | ||
3be91c4a | 285 | intervals = bio_integrity_intervals(bi, bio_sectors(bio)); |
7ba1ba12 MP |
286 | |
287 | /* Allocate kernel buffer for protection data */ | |
3be91c4a | 288 | len = intervals * bi->tuple_size; |
72f46503 | 289 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
290 | if (unlikely(buf == NULL)) { |
291 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 292 | return -ENOMEM; |
7ba1ba12 MP |
293 | } |
294 | ||
295 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
296 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
297 | nr_pages = end - start; | |
298 | ||
299 | /* Allocate bio integrity payload and integrity vectors */ | |
300 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
7b6c0f80 | 301 | if (IS_ERR(bip)) { |
7ba1ba12 MP |
302 | printk(KERN_ERR "could not allocate data integrity bioset\n"); |
303 | kfree(buf); | |
7b6c0f80 | 304 | return PTR_ERR(bip); |
7ba1ba12 MP |
305 | } |
306 | ||
b1f01388 | 307 | bip->bip_flags |= BIP_BLOCK_INTEGRITY; |
d57a5f7c | 308 | bip->bip_iter.bi_size = len; |
18593088 | 309 | bip_set_seed(bip, bio->bi_iter.bi_sector); |
7ba1ba12 | 310 | |
aae7df50 MP |
311 | if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) |
312 | bip->bip_flags |= BIP_IP_CHECKSUM; | |
313 | ||
7ba1ba12 MP |
314 | /* Map it */ |
315 | offset = offset_in_page(buf); | |
316 | for (i = 0 ; i < nr_pages ; i++) { | |
317 | int ret; | |
318 | bytes = PAGE_SIZE - offset; | |
319 | ||
320 | if (len <= 0) | |
321 | break; | |
322 | ||
323 | if (bytes > len) | |
324 | bytes = len; | |
325 | ||
326 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
327 | bytes, offset); | |
328 | ||
329 | if (ret == 0) | |
330 | return 0; | |
331 | ||
332 | if (ret < bytes) | |
333 | break; | |
334 | ||
335 | buf += bytes; | |
336 | len -= bytes; | |
337 | offset = 0; | |
338 | } | |
339 | ||
340 | /* Install custom I/O completion handler if read verify is enabled */ | |
341 | if (bio_data_dir(bio) == READ) { | |
342 | bip->bip_end_io = bio->bi_end_io; | |
343 | bio->bi_end_io = bio_integrity_endio; | |
344 | } | |
345 | ||
346 | /* Auto-generate integrity metadata if this is a write */ | |
347 | if (bio_data_dir(bio) == WRITE) | |
0f8087ec | 348 | bio_integrity_process(bio, bi->profile->generate_fn); |
7ba1ba12 MP |
349 | |
350 | return 0; | |
351 | } | |
352 | EXPORT_SYMBOL(bio_integrity_prep); | |
353 | ||
7ba1ba12 MP |
354 | /** |
355 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
356 | * @work: Work struct stored in bio to be verified | |
357 | * | |
358 | * Description: This workqueue function is called to complete a READ | |
359 | * request. The function verifies the transferred integrity metadata | |
360 | * and then calls the original bio end_io function. | |
361 | */ | |
362 | static void bio_integrity_verify_fn(struct work_struct *work) | |
363 | { | |
b984679e | 364 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
365 | container_of(work, struct bio_integrity_payload, bip_work); |
366 | struct bio *bio = bip->bip_bio; | |
18593088 | 367 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
7ba1ba12 | 368 | |
0f8087ec | 369 | bio->bi_error = bio_integrity_process(bio, bi->profile->verify_fn); |
7ba1ba12 MP |
370 | |
371 | /* Restore original bio completion handler */ | |
372 | bio->bi_end_io = bip->bip_end_io; | |
4246a0b6 | 373 | bio_endio(bio); |
7ba1ba12 MP |
374 | } |
375 | ||
376 | /** | |
377 | * bio_integrity_endio - Integrity I/O completion function | |
378 | * @bio: Protected bio | |
379 | * @error: Pointer to errno | |
380 | * | |
381 | * Description: Completion for integrity I/O | |
382 | * | |
383 | * Normally I/O completion is done in interrupt context. However, | |
384 | * verifying I/O integrity is a time-consuming task which must be run | |
385 | * in process context. This function postpones completion | |
386 | * accordingly. | |
387 | */ | |
4246a0b6 | 388 | void bio_integrity_endio(struct bio *bio) |
7ba1ba12 | 389 | { |
180b2f95 | 390 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
391 | |
392 | BUG_ON(bip->bip_bio != bio); | |
393 | ||
7b24fc4d MP |
394 | /* In case of an I/O error there is no point in verifying the |
395 | * integrity metadata. Restore original bio end_io handler | |
396 | * and run it. | |
397 | */ | |
4246a0b6 | 398 | if (bio->bi_error) { |
7b24fc4d | 399 | bio->bi_end_io = bip->bip_end_io; |
4246a0b6 | 400 | bio_endio(bio); |
7b24fc4d MP |
401 | |
402 | return; | |
403 | } | |
404 | ||
7ba1ba12 MP |
405 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
406 | queue_work(kintegrityd_wq, &bip->bip_work); | |
407 | } | |
408 | EXPORT_SYMBOL(bio_integrity_endio); | |
409 | ||
7ba1ba12 MP |
410 | /** |
411 | * bio_integrity_advance - Advance integrity vector | |
412 | * @bio: bio whose integrity vector to update | |
413 | * @bytes_done: number of data bytes that have been completed | |
414 | * | |
415 | * Description: This function calculates how many integrity bytes the | |
416 | * number of completed data bytes correspond to and advances the | |
417 | * integrity vector accordingly. | |
418 | */ | |
419 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
420 | { | |
180b2f95 | 421 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 422 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
d57a5f7c | 423 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 424 | |
d57a5f7c | 425 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 MP |
426 | } |
427 | EXPORT_SYMBOL(bio_integrity_advance); | |
428 | ||
429 | /** | |
430 | * bio_integrity_trim - Trim integrity vector | |
431 | * @bio: bio whose integrity vector to update | |
432 | * @offset: offset to first data sector | |
433 | * @sectors: number of data sectors | |
434 | * | |
435 | * Description: Used to trim the integrity vector in a cloned bio. | |
436 | * The ivec will be advanced corresponding to 'offset' data sectors | |
437 | * and the length will be truncated corresponding to 'len' data | |
438 | * sectors. | |
439 | */ | |
b984679e JA |
440 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
441 | unsigned int sectors) | |
7ba1ba12 | 442 | { |
180b2f95 | 443 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 444 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
7ba1ba12 | 445 | |
d57a5f7c KO |
446 | bio_integrity_advance(bio, offset << 9); |
447 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); | |
7ba1ba12 MP |
448 | } |
449 | EXPORT_SYMBOL(bio_integrity_trim); | |
450 | ||
7ba1ba12 MP |
451 | /** |
452 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
453 | * @bio: New bio | |
454 | * @bio_src: Original bio | |
87092698 | 455 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
456 | * |
457 | * Description: Called to allocate a bip when cloning a bio | |
458 | */ | |
7878cba9 | 459 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 460 | gfp_t gfp_mask) |
7ba1ba12 | 461 | { |
180b2f95 | 462 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
7ba1ba12 MP |
463 | struct bio_integrity_payload *bip; |
464 | ||
465 | BUG_ON(bip_src == NULL); | |
466 | ||
1e2a410f | 467 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7b6c0f80 DC |
468 | if (IS_ERR(bip)) |
469 | return PTR_ERR(bip); | |
7ba1ba12 MP |
470 | |
471 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
472 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
473 | ||
7ba1ba12 | 474 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 475 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
476 | |
477 | return 0; | |
478 | } | |
479 | EXPORT_SYMBOL(bio_integrity_clone); | |
480 | ||
7878cba9 | 481 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 482 | { |
a91a2785 MP |
483 | if (bs->bio_integrity_pool) |
484 | return 0; | |
485 | ||
9f060e22 | 486 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
bc5c8f07 | 487 | if (!bs->bio_integrity_pool) |
9f060e22 | 488 | return -1; |
7ba1ba12 | 489 | |
a6c39cb4 | 490 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
bc5c8f07 GZ |
491 | if (!bs->bvec_integrity_pool) { |
492 | mempool_destroy(bs->bio_integrity_pool); | |
7878cba9 | 493 | return -1; |
bc5c8f07 | 494 | } |
7878cba9 MP |
495 | |
496 | return 0; | |
497 | } | |
498 | EXPORT_SYMBOL(bioset_integrity_create); | |
499 | ||
500 | void bioset_integrity_free(struct bio_set *bs) | |
501 | { | |
502 | if (bs->bio_integrity_pool) | |
503 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
504 | |
505 | if (bs->bvec_integrity_pool) | |
adbe6991 | 506 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
507 | } |
508 | EXPORT_SYMBOL(bioset_integrity_free); | |
509 | ||
510 | void __init bio_integrity_init(void) | |
511 | { | |
a6e8dc46 TH |
512 | /* |
513 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
514 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
515 | */ | |
516 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
517 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
518 | if (!kintegrityd_wq) |
519 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 520 | |
9f060e22 KO |
521 | bip_slab = kmem_cache_create("bio_integrity_payload", |
522 | sizeof(struct bio_integrity_payload) + | |
523 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
524 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
7ba1ba12 | 525 | } |