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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 | ||
35 | /** | |
1e2a410f | 36 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
7ba1ba12 MP |
37 | * @bio: bio to attach integrity metadata to |
38 | * @gfp_mask: Memory allocation mask | |
39 | * @nr_vecs: Number of integrity metadata scatter-gather elements | |
7ba1ba12 MP |
40 | * |
41 | * Description: This function prepares a bio for attaching integrity | |
42 | * metadata. nr_vecs specifies the maximum number of pages containing | |
43 | * integrity metadata that can be attached. | |
44 | */ | |
1e2a410f KO |
45 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
46 | gfp_t gfp_mask, | |
47 | unsigned int nr_vecs) | |
7ba1ba12 MP |
48 | { |
49 | struct bio_integrity_payload *bip; | |
1e2a410f | 50 | struct bio_set *bs = bio->bi_pool; |
9f060e22 KO |
51 | unsigned long idx = BIO_POOL_NONE; |
52 | unsigned inline_vecs; | |
53 | ||
54 | if (!bs) { | |
55 | bip = kmalloc(sizeof(struct bio_integrity_payload) + | |
56 | sizeof(struct bio_vec) * nr_vecs, gfp_mask); | |
57 | inline_vecs = nr_vecs; | |
58 | } else { | |
7878cba9 | 59 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
9f060e22 | 60 | inline_vecs = BIP_INLINE_VECS; |
7ba1ba12 MP |
61 | } |
62 | ||
9f060e22 KO |
63 | if (unlikely(!bip)) |
64 | return NULL; | |
65 | ||
7878cba9 MP |
66 | memset(bip, 0, sizeof(*bip)); |
67 | ||
9f060e22 KO |
68 | if (nr_vecs > inline_vecs) { |
69 | bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, | |
70 | bs->bvec_integrity_pool); | |
71 | if (!bip->bip_vec) | |
72 | goto err; | |
cbcd1054 | 73 | bip->bip_max_vcnt = bvec_nr_vecs(idx); |
9f060e22 KO |
74 | } else { |
75 | bip->bip_vec = bip->bip_inline_vecs; | |
cbcd1054 | 76 | bip->bip_max_vcnt = inline_vecs; |
9f060e22 KO |
77 | } |
78 | ||
7878cba9 | 79 | bip->bip_slab = idx; |
7ba1ba12 MP |
80 | bip->bip_bio = bio; |
81 | bio->bi_integrity = bip; | |
180b2f95 | 82 | bio->bi_rw |= REQ_INTEGRITY; |
7ba1ba12 MP |
83 | |
84 | return bip; | |
9f060e22 KO |
85 | err: |
86 | mempool_free(bip, bs->bio_integrity_pool); | |
87 | return NULL; | |
7ba1ba12 | 88 | } |
7ba1ba12 MP |
89 | EXPORT_SYMBOL(bio_integrity_alloc); |
90 | ||
91 | /** | |
92 | * bio_integrity_free - Free bio integrity payload | |
93 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
94 | * |
95 | * Description: Used to free the integrity portion of a bio. Usually | |
96 | * called from bio_free(). | |
97 | */ | |
1e2a410f | 98 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 | 99 | { |
180b2f95 | 100 | struct bio_integrity_payload *bip = bio_integrity(bio); |
1e2a410f KO |
101 | struct bio_set *bs = bio->bi_pool; |
102 | ||
29ed7813 | 103 | if (bip->bip_owns_buf) |
5f9378fa MP |
104 | kfree(page_address(bip->bip_vec->bv_page) + |
105 | bip->bip_vec->bv_offset); | |
7ba1ba12 | 106 | |
9f060e22 KO |
107 | if (bs) { |
108 | if (bip->bip_slab != BIO_POOL_NONE) | |
109 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, | |
110 | bip->bip_slab); | |
111 | ||
7878cba9 | 112 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
113 | } else { |
114 | kfree(bip); | |
115 | } | |
7ba1ba12 MP |
116 | |
117 | bio->bi_integrity = NULL; | |
118 | } | |
119 | EXPORT_SYMBOL(bio_integrity_free); | |
120 | ||
121 | /** | |
122 | * bio_integrity_add_page - Attach integrity metadata | |
123 | * @bio: bio to update | |
124 | * @page: page containing integrity metadata | |
125 | * @len: number of bytes of integrity metadata in page | |
126 | * @offset: start offset within page | |
127 | * | |
128 | * Description: Attach a page containing integrity metadata to bio. | |
129 | */ | |
130 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
131 | unsigned int len, unsigned int offset) | |
132 | { | |
180b2f95 | 133 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
134 | struct bio_vec *iv; |
135 | ||
cbcd1054 | 136 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
7ba1ba12 MP |
137 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
138 | return 0; | |
139 | } | |
140 | ||
d57a5f7c | 141 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 MP |
142 | |
143 | iv->bv_page = page; | |
144 | iv->bv_len = len; | |
145 | iv->bv_offset = offset; | |
146 | bip->bip_vcnt++; | |
147 | ||
148 | return len; | |
149 | } | |
150 | EXPORT_SYMBOL(bio_integrity_add_page); | |
151 | ||
152 | /** | |
153 | * bio_integrity_enabled - Check whether integrity can be passed | |
154 | * @bio: bio to check | |
155 | * | |
156 | * Description: Determines whether bio_integrity_prep() can be called | |
157 | * on this bio or not. bio data direction and target device must be | |
158 | * set prior to calling. The functions honors the write_generate and | |
159 | * read_verify flags in sysfs. | |
160 | */ | |
e7258c1a | 161 | bool bio_integrity_enabled(struct bio *bio) |
7ba1ba12 | 162 | { |
e7258c1a MP |
163 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
164 | ||
e69f18f0 | 165 | if (!bio_is_rw(bio)) |
e7258c1a | 166 | return false; |
e69f18f0 | 167 | |
7ba1ba12 MP |
168 | /* Already protected? */ |
169 | if (bio_integrity(bio)) | |
e7258c1a MP |
170 | return false; |
171 | ||
172 | if (bi == NULL) | |
173 | return false; | |
174 | ||
175 | if (bio_data_dir(bio) == READ && bi->verify_fn != NULL && | |
176 | (bi->flags & INTEGRITY_FLAG_READ)) | |
177 | return true; | |
178 | ||
179 | if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL && | |
180 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
181 | return true; | |
7ba1ba12 | 182 | |
e7258c1a | 183 | return false; |
7ba1ba12 MP |
184 | } |
185 | EXPORT_SYMBOL(bio_integrity_enabled); | |
186 | ||
187 | /** | |
3be91c4a | 188 | * bio_integrity_intervals - Return number of integrity intervals for a bio |
7ba1ba12 | 189 | * @bi: blk_integrity profile for device |
3be91c4a | 190 | * @sectors: Size of the bio in 512-byte sectors |
7ba1ba12 MP |
191 | * |
192 | * Description: The block layer calculates everything in 512 byte | |
3be91c4a MP |
193 | * sectors but integrity metadata is done in terms of the data integrity |
194 | * interval size of the storage device. Convert the block layer sectors | |
195 | * to the appropriate number of integrity intervals. | |
7ba1ba12 | 196 | */ |
3be91c4a MP |
197 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
198 | unsigned int sectors) | |
7ba1ba12 | 199 | { |
5a2aa873 | 200 | return sectors >> (ilog2(bi->interval) - 9); |
7ba1ba12 MP |
201 | } |
202 | ||
d57a5f7c KO |
203 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
204 | unsigned int sectors) | |
205 | { | |
3be91c4a | 206 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
d57a5f7c KO |
207 | } |
208 | ||
7ba1ba12 | 209 | /** |
bf36f9cf GZ |
210 | * bio_integrity_generate_verify - Generate/verify integrity metadata for a bio |
211 | * @bio: bio to generate/verify integrity metadata for | |
212 | * @operate: operate number, 1 for generate, 0 for verify | |
7ba1ba12 | 213 | */ |
bf36f9cf | 214 | static int bio_integrity_generate_verify(struct bio *bio, int operate) |
7ba1ba12 MP |
215 | { |
216 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
217 | struct blk_integrity_exchg bix; | |
0bc69973 | 218 | struct bio_vec *bv; |
5f9378fa | 219 | struct bio_integrity_payload *bip = bio_integrity(bio); |
3be91c4a MP |
220 | sector_t seed; |
221 | unsigned int intervals, ret = 0, i; | |
5f9378fa MP |
222 | void *prot_buf = page_address(bip->bip_vec->bv_page) + |
223 | bip->bip_vec->bv_offset; | |
7ba1ba12 | 224 | |
bf36f9cf | 225 | if (operate) |
3be91c4a | 226 | seed = bio->bi_iter.bi_sector; |
bf36f9cf | 227 | else |
3be91c4a | 228 | seed = bip->bip_iter.bi_sector; |
bf36f9cf | 229 | |
7ba1ba12 | 230 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; |
3be91c4a | 231 | bix.interval = bi->interval; |
7ba1ba12 | 232 | |
0bc69973 MP |
233 | bio_for_each_segment_all(bv, bio, i) { |
234 | void *kaddr = kmap_atomic(bv->bv_page); | |
235 | bix.data_buf = kaddr + bv->bv_offset; | |
236 | bix.data_size = bv->bv_len; | |
7ba1ba12 | 237 | bix.prot_buf = prot_buf; |
3be91c4a | 238 | bix.seed = seed; |
7ba1ba12 | 239 | |
0bc69973 | 240 | if (operate) |
bf36f9cf | 241 | bi->generate_fn(&bix); |
0bc69973 | 242 | else { |
bf36f9cf GZ |
243 | ret = bi->verify_fn(&bix); |
244 | if (ret) { | |
245 | kunmap_atomic(kaddr); | |
246 | return ret; | |
247 | } | |
248 | } | |
7ba1ba12 | 249 | |
3be91c4a MP |
250 | intervals = bv->bv_len / bi->interval; |
251 | seed += intervals; | |
252 | prot_buf += intervals * bi->tuple_size; | |
7ba1ba12 | 253 | |
e8e3c3d6 | 254 | kunmap_atomic(kaddr); |
7ba1ba12 | 255 | } |
bf36f9cf GZ |
256 | return ret; |
257 | } | |
258 | ||
259 | /** | |
260 | * bio_integrity_generate - Generate integrity metadata for a bio | |
261 | * @bio: bio to generate integrity metadata for | |
262 | * | |
263 | * Description: Generates integrity metadata for a bio by calling the | |
264 | * block device's generation callback function. The bio must have a | |
265 | * bip attached with enough room to accommodate the generated | |
266 | * integrity metadata. | |
267 | */ | |
268 | static void bio_integrity_generate(struct bio *bio) | |
269 | { | |
270 | bio_integrity_generate_verify(bio, 1); | |
7ba1ba12 MP |
271 | } |
272 | ||
273 | /** | |
274 | * bio_integrity_prep - Prepare bio for integrity I/O | |
275 | * @bio: bio to prepare | |
276 | * | |
277 | * Description: Allocates a buffer for integrity metadata, maps the | |
278 | * pages and attaches them to a bio. The bio must have data | |
279 | * direction, target device and start sector set priot to calling. In | |
280 | * the WRITE case, integrity metadata will be generated using the | |
281 | * block device's integrity function. In the READ case, the buffer | |
282 | * will be prepared for DMA and a suitable end_io handler set up. | |
283 | */ | |
284 | int bio_integrity_prep(struct bio *bio) | |
285 | { | |
286 | struct bio_integrity_payload *bip; | |
287 | struct blk_integrity *bi; | |
288 | struct request_queue *q; | |
289 | void *buf; | |
290 | unsigned long start, end; | |
291 | unsigned int len, nr_pages; | |
292 | unsigned int bytes, offset, i; | |
3be91c4a | 293 | unsigned int intervals; |
7ba1ba12 MP |
294 | |
295 | bi = bdev_get_integrity(bio->bi_bdev); | |
296 | q = bdev_get_queue(bio->bi_bdev); | |
297 | BUG_ON(bi == NULL); | |
298 | BUG_ON(bio_integrity(bio)); | |
299 | ||
3be91c4a | 300 | intervals = bio_integrity_intervals(bi, bio_sectors(bio)); |
7ba1ba12 MP |
301 | |
302 | /* Allocate kernel buffer for protection data */ | |
3be91c4a | 303 | len = intervals * bi->tuple_size; |
72f46503 | 304 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
305 | if (unlikely(buf == NULL)) { |
306 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 307 | return -ENOMEM; |
7ba1ba12 MP |
308 | } |
309 | ||
310 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
311 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
312 | nr_pages = end - start; | |
313 | ||
314 | /* Allocate bio integrity payload and integrity vectors */ | |
315 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
316 | if (unlikely(bip == NULL)) { | |
317 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
318 | kfree(buf); | |
319 | return -EIO; | |
320 | } | |
321 | ||
29ed7813 | 322 | bip->bip_owns_buf = 1; |
d57a5f7c KO |
323 | bip->bip_iter.bi_size = len; |
324 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; | |
7ba1ba12 MP |
325 | |
326 | /* Map it */ | |
327 | offset = offset_in_page(buf); | |
328 | for (i = 0 ; i < nr_pages ; i++) { | |
329 | int ret; | |
330 | bytes = PAGE_SIZE - offset; | |
331 | ||
332 | if (len <= 0) | |
333 | break; | |
334 | ||
335 | if (bytes > len) | |
336 | bytes = len; | |
337 | ||
338 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
339 | bytes, offset); | |
340 | ||
341 | if (ret == 0) | |
342 | return 0; | |
343 | ||
344 | if (ret < bytes) | |
345 | break; | |
346 | ||
347 | buf += bytes; | |
348 | len -= bytes; | |
349 | offset = 0; | |
350 | } | |
351 | ||
352 | /* Install custom I/O completion handler if read verify is enabled */ | |
353 | if (bio_data_dir(bio) == READ) { | |
354 | bip->bip_end_io = bio->bi_end_io; | |
355 | bio->bi_end_io = bio_integrity_endio; | |
356 | } | |
357 | ||
358 | /* Auto-generate integrity metadata if this is a write */ | |
359 | if (bio_data_dir(bio) == WRITE) | |
360 | bio_integrity_generate(bio); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | EXPORT_SYMBOL(bio_integrity_prep); | |
365 | ||
366 | /** | |
367 | * bio_integrity_verify - Verify integrity metadata for a bio | |
368 | * @bio: bio to verify | |
369 | * | |
370 | * Description: This function is called to verify the integrity of a | |
371 | * bio. The data in the bio io_vec is compared to the integrity | |
372 | * metadata returned by the HBA. | |
373 | */ | |
374 | static int bio_integrity_verify(struct bio *bio) | |
375 | { | |
bf36f9cf | 376 | return bio_integrity_generate_verify(bio, 0); |
7ba1ba12 MP |
377 | } |
378 | ||
379 | /** | |
380 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
381 | * @work: Work struct stored in bio to be verified | |
382 | * | |
383 | * Description: This workqueue function is called to complete a READ | |
384 | * request. The function verifies the transferred integrity metadata | |
385 | * and then calls the original bio end_io function. | |
386 | */ | |
387 | static void bio_integrity_verify_fn(struct work_struct *work) | |
388 | { | |
b984679e | 389 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
390 | container_of(work, struct bio_integrity_payload, bip_work); |
391 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 392 | int error; |
7ba1ba12 | 393 | |
7b24fc4d | 394 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
395 | |
396 | /* Restore original bio completion handler */ | |
397 | bio->bi_end_io = bip->bip_end_io; | |
196d38bc | 398 | bio_endio_nodec(bio, error); |
7ba1ba12 MP |
399 | } |
400 | ||
401 | /** | |
402 | * bio_integrity_endio - Integrity I/O completion function | |
403 | * @bio: Protected bio | |
404 | * @error: Pointer to errno | |
405 | * | |
406 | * Description: Completion for integrity I/O | |
407 | * | |
408 | * Normally I/O completion is done in interrupt context. However, | |
409 | * verifying I/O integrity is a time-consuming task which must be run | |
410 | * in process context. This function postpones completion | |
411 | * accordingly. | |
412 | */ | |
413 | void bio_integrity_endio(struct bio *bio, int error) | |
414 | { | |
180b2f95 | 415 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
416 | |
417 | BUG_ON(bip->bip_bio != bio); | |
418 | ||
7b24fc4d MP |
419 | /* In case of an I/O error there is no point in verifying the |
420 | * integrity metadata. Restore original bio end_io handler | |
421 | * and run it. | |
422 | */ | |
423 | if (error) { | |
424 | bio->bi_end_io = bip->bip_end_io; | |
16f408dc | 425 | bio_endio_nodec(bio, error); |
7b24fc4d MP |
426 | |
427 | return; | |
428 | } | |
429 | ||
7ba1ba12 MP |
430 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
431 | queue_work(kintegrityd_wq, &bip->bip_work); | |
432 | } | |
433 | EXPORT_SYMBOL(bio_integrity_endio); | |
434 | ||
7ba1ba12 MP |
435 | /** |
436 | * bio_integrity_advance - Advance integrity vector | |
437 | * @bio: bio whose integrity vector to update | |
438 | * @bytes_done: number of data bytes that have been completed | |
439 | * | |
440 | * Description: This function calculates how many integrity bytes the | |
441 | * number of completed data bytes correspond to and advances the | |
442 | * integrity vector accordingly. | |
443 | */ | |
444 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
445 | { | |
180b2f95 | 446 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 447 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
d57a5f7c | 448 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 449 | |
d57a5f7c | 450 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 MP |
451 | } |
452 | EXPORT_SYMBOL(bio_integrity_advance); | |
453 | ||
454 | /** | |
455 | * bio_integrity_trim - Trim integrity vector | |
456 | * @bio: bio whose integrity vector to update | |
457 | * @offset: offset to first data sector | |
458 | * @sectors: number of data sectors | |
459 | * | |
460 | * Description: Used to trim the integrity vector in a cloned bio. | |
461 | * The ivec will be advanced corresponding to 'offset' data sectors | |
462 | * and the length will be truncated corresponding to 'len' data | |
463 | * sectors. | |
464 | */ | |
b984679e JA |
465 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
466 | unsigned int sectors) | |
7ba1ba12 | 467 | { |
180b2f95 | 468 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 469 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
7ba1ba12 | 470 | |
d57a5f7c KO |
471 | bio_integrity_advance(bio, offset << 9); |
472 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); | |
7ba1ba12 MP |
473 | } |
474 | EXPORT_SYMBOL(bio_integrity_trim); | |
475 | ||
7ba1ba12 MP |
476 | /** |
477 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
478 | * @bio: New bio | |
479 | * @bio_src: Original bio | |
87092698 | 480 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
481 | * |
482 | * Description: Called to allocate a bip when cloning a bio | |
483 | */ | |
7878cba9 | 484 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 485 | gfp_t gfp_mask) |
7ba1ba12 | 486 | { |
180b2f95 | 487 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
7ba1ba12 MP |
488 | struct bio_integrity_payload *bip; |
489 | ||
490 | BUG_ON(bip_src == NULL); | |
491 | ||
1e2a410f | 492 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
493 | |
494 | if (bip == NULL) | |
495 | return -EIO; | |
496 | ||
497 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
498 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
499 | ||
7ba1ba12 | 500 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 501 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
502 | |
503 | return 0; | |
504 | } | |
505 | EXPORT_SYMBOL(bio_integrity_clone); | |
506 | ||
7878cba9 | 507 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 508 | { |
a91a2785 MP |
509 | if (bs->bio_integrity_pool) |
510 | return 0; | |
511 | ||
9f060e22 | 512 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
bc5c8f07 | 513 | if (!bs->bio_integrity_pool) |
9f060e22 | 514 | return -1; |
7ba1ba12 | 515 | |
a6c39cb4 | 516 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
bc5c8f07 GZ |
517 | if (!bs->bvec_integrity_pool) { |
518 | mempool_destroy(bs->bio_integrity_pool); | |
7878cba9 | 519 | return -1; |
bc5c8f07 | 520 | } |
7878cba9 MP |
521 | |
522 | return 0; | |
523 | } | |
524 | EXPORT_SYMBOL(bioset_integrity_create); | |
525 | ||
526 | void bioset_integrity_free(struct bio_set *bs) | |
527 | { | |
528 | if (bs->bio_integrity_pool) | |
529 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
530 | |
531 | if (bs->bvec_integrity_pool) | |
adbe6991 | 532 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
533 | } |
534 | EXPORT_SYMBOL(bioset_integrity_free); | |
535 | ||
536 | void __init bio_integrity_init(void) | |
537 | { | |
a6e8dc46 TH |
538 | /* |
539 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
540 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
541 | */ | |
542 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
543 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
544 | if (!kintegrityd_wq) |
545 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 546 | |
9f060e22 KO |
547 | bip_slab = kmem_cache_create("bio_integrity_payload", |
548 | sizeof(struct bio_integrity_payload) + | |
549 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
550 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
551 | if (!bip_slab) | |
552 | panic("Failed to create slab\n"); | |
7ba1ba12 | 553 | } |