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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; | |
82 | ||
83 | return bip; | |
9f060e22 KO |
84 | err: |
85 | mempool_free(bip, bs->bio_integrity_pool); | |
86 | return NULL; | |
7ba1ba12 | 87 | } |
7ba1ba12 MP |
88 | EXPORT_SYMBOL(bio_integrity_alloc); |
89 | ||
90 | /** | |
91 | * bio_integrity_free - Free bio integrity payload | |
92 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
93 | * |
94 | * Description: Used to free the integrity portion of a bio. Usually | |
95 | * called from bio_free(). | |
96 | */ | |
1e2a410f | 97 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 MP |
98 | { |
99 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
1e2a410f KO |
100 | struct bio_set *bs = bio->bi_pool; |
101 | ||
29ed7813 | 102 | if (bip->bip_owns_buf) |
7ba1ba12 MP |
103 | kfree(bip->bip_buf); |
104 | ||
9f060e22 KO |
105 | if (bs) { |
106 | if (bip->bip_slab != BIO_POOL_NONE) | |
107 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, | |
108 | bip->bip_slab); | |
109 | ||
7878cba9 | 110 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
111 | } else { |
112 | kfree(bip); | |
113 | } | |
7ba1ba12 MP |
114 | |
115 | bio->bi_integrity = NULL; | |
116 | } | |
117 | EXPORT_SYMBOL(bio_integrity_free); | |
118 | ||
119 | /** | |
120 | * bio_integrity_add_page - Attach integrity metadata | |
121 | * @bio: bio to update | |
122 | * @page: page containing integrity metadata | |
123 | * @len: number of bytes of integrity metadata in page | |
124 | * @offset: start offset within page | |
125 | * | |
126 | * Description: Attach a page containing integrity metadata to bio. | |
127 | */ | |
128 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
129 | unsigned int len, unsigned int offset) | |
130 | { | |
131 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
132 | struct bio_vec *iv; | |
133 | ||
cbcd1054 | 134 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
7ba1ba12 MP |
135 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
136 | return 0; | |
137 | } | |
138 | ||
d57a5f7c | 139 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 MP |
140 | |
141 | iv->bv_page = page; | |
142 | iv->bv_len = len; | |
143 | iv->bv_offset = offset; | |
144 | bip->bip_vcnt++; | |
145 | ||
146 | return len; | |
147 | } | |
148 | EXPORT_SYMBOL(bio_integrity_add_page); | |
149 | ||
150 | /** | |
151 | * bio_integrity_enabled - Check whether integrity can be passed | |
152 | * @bio: bio to check | |
153 | * | |
154 | * Description: Determines whether bio_integrity_prep() can be called | |
155 | * on this bio or not. bio data direction and target device must be | |
156 | * set prior to calling. The functions honors the write_generate and | |
157 | * read_verify flags in sysfs. | |
158 | */ | |
e7258c1a | 159 | bool bio_integrity_enabled(struct bio *bio) |
7ba1ba12 | 160 | { |
e7258c1a MP |
161 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
162 | ||
e69f18f0 | 163 | if (!bio_is_rw(bio)) |
e7258c1a | 164 | return false; |
e69f18f0 | 165 | |
7ba1ba12 MP |
166 | /* Already protected? */ |
167 | if (bio_integrity(bio)) | |
e7258c1a MP |
168 | return false; |
169 | ||
170 | if (bi == NULL) | |
171 | return false; | |
172 | ||
173 | if (bio_data_dir(bio) == READ && bi->verify_fn != NULL && | |
174 | (bi->flags & INTEGRITY_FLAG_READ)) | |
175 | return true; | |
176 | ||
177 | if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL && | |
178 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
179 | return true; | |
7ba1ba12 | 180 | |
e7258c1a | 181 | return false; |
7ba1ba12 MP |
182 | } |
183 | EXPORT_SYMBOL(bio_integrity_enabled); | |
184 | ||
185 | /** | |
186 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto | |
187 | * @bi: blk_integrity profile for device | |
188 | * @sectors: Number of 512 sectors to convert | |
189 | * | |
190 | * Description: The block layer calculates everything in 512 byte | |
191 | * sectors but integrity metadata is done in terms of the hardware | |
192 | * sector size of the storage device. Convert the block layer sectors | |
193 | * to physical sectors. | |
194 | */ | |
b984679e JA |
195 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
196 | unsigned int sectors) | |
7ba1ba12 MP |
197 | { |
198 | /* At this point there are only 512b or 4096b DIF/EPP devices */ | |
199 | if (bi->sector_size == 4096) | |
200 | return sectors >>= 3; | |
201 | ||
202 | return sectors; | |
203 | } | |
204 | ||
d57a5f7c KO |
205 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
206 | unsigned int sectors) | |
207 | { | |
208 | return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size; | |
209 | } | |
210 | ||
7ba1ba12 MP |
211 | /** |
212 | * bio_integrity_tag_size - Retrieve integrity tag space | |
213 | * @bio: bio to inspect | |
214 | * | |
215 | * Description: Returns the maximum number of tag bytes that can be | |
216 | * attached to this bio. Filesystems can use this to determine how | |
217 | * much metadata to attach to an I/O. | |
218 | */ | |
219 | unsigned int bio_integrity_tag_size(struct bio *bio) | |
220 | { | |
221 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
222 | ||
4f024f37 | 223 | BUG_ON(bio->bi_iter.bi_size == 0); |
7ba1ba12 | 224 | |
4f024f37 | 225 | return bi->tag_size * (bio->bi_iter.bi_size / bi->sector_size); |
7ba1ba12 MP |
226 | } |
227 | EXPORT_SYMBOL(bio_integrity_tag_size); | |
228 | ||
0b4ef8de RK |
229 | static int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, |
230 | int set) | |
7ba1ba12 MP |
231 | { |
232 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
233 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
234 | unsigned int nr_sectors; | |
235 | ||
236 | BUG_ON(bip->bip_buf == NULL); | |
237 | ||
238 | if (bi->tag_size == 0) | |
239 | return -1; | |
240 | ||
b984679e JA |
241 | nr_sectors = bio_integrity_hw_sectors(bi, |
242 | DIV_ROUND_UP(len, bi->tag_size)); | |
7ba1ba12 | 243 | |
d57a5f7c KO |
244 | if (nr_sectors * bi->tuple_size > bip->bip_iter.bi_size) { |
245 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", __func__, | |
246 | nr_sectors * bi->tuple_size, bip->bip_iter.bi_size); | |
7ba1ba12 MP |
247 | return -1; |
248 | } | |
249 | ||
250 | if (set) | |
251 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
252 | else | |
253 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | /** | |
259 | * bio_integrity_set_tag - Attach a tag buffer to a bio | |
260 | * @bio: bio to attach buffer to | |
261 | * @tag_buf: Pointer to a buffer containing tag data | |
262 | * @len: Length of the included buffer | |
263 | * | |
264 | * Description: Use this function to tag a bio by leveraging the extra | |
265 | * space provided by devices formatted with integrity protection. The | |
266 | * size of the integrity buffer must be <= to the size reported by | |
267 | * bio_integrity_tag_size(). | |
268 | */ | |
269 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
270 | { | |
271 | BUG_ON(bio_data_dir(bio) != WRITE); | |
272 | ||
273 | return bio_integrity_tag(bio, tag_buf, len, 1); | |
274 | } | |
275 | EXPORT_SYMBOL(bio_integrity_set_tag); | |
276 | ||
277 | /** | |
278 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio | |
279 | * @bio: bio to retrieve buffer from | |
280 | * @tag_buf: Pointer to a buffer for the tag data | |
281 | * @len: Length of the target buffer | |
282 | * | |
283 | * Description: Use this function to retrieve the tag buffer from a | |
284 | * completed I/O. The size of the integrity buffer must be <= to the | |
285 | * size reported by bio_integrity_tag_size(). | |
286 | */ | |
287 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
288 | { | |
289 | BUG_ON(bio_data_dir(bio) != READ); | |
290 | ||
291 | return bio_integrity_tag(bio, tag_buf, len, 0); | |
292 | } | |
293 | EXPORT_SYMBOL(bio_integrity_get_tag); | |
294 | ||
295 | /** | |
bf36f9cf GZ |
296 | * bio_integrity_generate_verify - Generate/verify integrity metadata for a bio |
297 | * @bio: bio to generate/verify integrity metadata for | |
298 | * @operate: operate number, 1 for generate, 0 for verify | |
7ba1ba12 | 299 | */ |
bf36f9cf | 300 | static int bio_integrity_generate_verify(struct bio *bio, int operate) |
7ba1ba12 MP |
301 | { |
302 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
303 | struct blk_integrity_exchg bix; | |
0bc69973 | 304 | struct bio_vec *bv; |
bf36f9cf | 305 | sector_t sector; |
0bc69973 | 306 | unsigned int sectors, ret = 0, i; |
7ba1ba12 MP |
307 | void *prot_buf = bio->bi_integrity->bip_buf; |
308 | ||
bf36f9cf GZ |
309 | if (operate) |
310 | sector = bio->bi_iter.bi_sector; | |
311 | else | |
312 | sector = bio->bi_integrity->bip_iter.bi_sector; | |
313 | ||
7ba1ba12 MP |
314 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; |
315 | bix.sector_size = bi->sector_size; | |
316 | ||
0bc69973 MP |
317 | bio_for_each_segment_all(bv, bio, i) { |
318 | void *kaddr = kmap_atomic(bv->bv_page); | |
319 | bix.data_buf = kaddr + bv->bv_offset; | |
320 | bix.data_size = bv->bv_len; | |
7ba1ba12 MP |
321 | bix.prot_buf = prot_buf; |
322 | bix.sector = sector; | |
323 | ||
0bc69973 | 324 | if (operate) |
bf36f9cf | 325 | bi->generate_fn(&bix); |
0bc69973 | 326 | else { |
bf36f9cf GZ |
327 | ret = bi->verify_fn(&bix); |
328 | if (ret) { | |
329 | kunmap_atomic(kaddr); | |
330 | return ret; | |
331 | } | |
332 | } | |
7ba1ba12 | 333 | |
0bc69973 | 334 | sectors = bv->bv_len / bi->sector_size; |
7ba1ba12 MP |
335 | sector += sectors; |
336 | prot_buf += sectors * bi->tuple_size; | |
7ba1ba12 | 337 | |
e8e3c3d6 | 338 | kunmap_atomic(kaddr); |
7ba1ba12 | 339 | } |
bf36f9cf GZ |
340 | return ret; |
341 | } | |
342 | ||
343 | /** | |
344 | * bio_integrity_generate - Generate integrity metadata for a bio | |
345 | * @bio: bio to generate integrity metadata for | |
346 | * | |
347 | * Description: Generates integrity metadata for a bio by calling the | |
348 | * block device's generation callback function. The bio must have a | |
349 | * bip attached with enough room to accommodate the generated | |
350 | * integrity metadata. | |
351 | */ | |
352 | static void bio_integrity_generate(struct bio *bio) | |
353 | { | |
354 | bio_integrity_generate_verify(bio, 1); | |
7ba1ba12 MP |
355 | } |
356 | ||
9c02f2b0 JA |
357 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
358 | { | |
359 | if (bi) | |
360 | return bi->tuple_size; | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
7ba1ba12 MP |
365 | /** |
366 | * bio_integrity_prep - Prepare bio for integrity I/O | |
367 | * @bio: bio to prepare | |
368 | * | |
369 | * Description: Allocates a buffer for integrity metadata, maps the | |
370 | * pages and attaches them to a bio. The bio must have data | |
371 | * direction, target device and start sector set priot to calling. In | |
372 | * the WRITE case, integrity metadata will be generated using the | |
373 | * block device's integrity function. In the READ case, the buffer | |
374 | * will be prepared for DMA and a suitable end_io handler set up. | |
375 | */ | |
376 | int bio_integrity_prep(struct bio *bio) | |
377 | { | |
378 | struct bio_integrity_payload *bip; | |
379 | struct blk_integrity *bi; | |
380 | struct request_queue *q; | |
381 | void *buf; | |
382 | unsigned long start, end; | |
383 | unsigned int len, nr_pages; | |
384 | unsigned int bytes, offset, i; | |
385 | unsigned int sectors; | |
386 | ||
387 | bi = bdev_get_integrity(bio->bi_bdev); | |
388 | q = bdev_get_queue(bio->bi_bdev); | |
389 | BUG_ON(bi == NULL); | |
390 | BUG_ON(bio_integrity(bio)); | |
391 | ||
392 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); | |
393 | ||
394 | /* Allocate kernel buffer for protection data */ | |
395 | len = sectors * blk_integrity_tuple_size(bi); | |
72f46503 | 396 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
397 | if (unlikely(buf == NULL)) { |
398 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 399 | return -ENOMEM; |
7ba1ba12 MP |
400 | } |
401 | ||
402 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
403 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
404 | nr_pages = end - start; | |
405 | ||
406 | /* Allocate bio integrity payload and integrity vectors */ | |
407 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
408 | if (unlikely(bip == NULL)) { | |
409 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
410 | kfree(buf); | |
411 | return -EIO; | |
412 | } | |
413 | ||
29ed7813 | 414 | bip->bip_owns_buf = 1; |
7ba1ba12 | 415 | bip->bip_buf = buf; |
d57a5f7c KO |
416 | bip->bip_iter.bi_size = len; |
417 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; | |
7ba1ba12 MP |
418 | |
419 | /* Map it */ | |
420 | offset = offset_in_page(buf); | |
421 | for (i = 0 ; i < nr_pages ; i++) { | |
422 | int ret; | |
423 | bytes = PAGE_SIZE - offset; | |
424 | ||
425 | if (len <= 0) | |
426 | break; | |
427 | ||
428 | if (bytes > len) | |
429 | bytes = len; | |
430 | ||
431 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
432 | bytes, offset); | |
433 | ||
434 | if (ret == 0) | |
435 | return 0; | |
436 | ||
437 | if (ret < bytes) | |
438 | break; | |
439 | ||
440 | buf += bytes; | |
441 | len -= bytes; | |
442 | offset = 0; | |
443 | } | |
444 | ||
445 | /* Install custom I/O completion handler if read verify is enabled */ | |
446 | if (bio_data_dir(bio) == READ) { | |
447 | bip->bip_end_io = bio->bi_end_io; | |
448 | bio->bi_end_io = bio_integrity_endio; | |
449 | } | |
450 | ||
451 | /* Auto-generate integrity metadata if this is a write */ | |
452 | if (bio_data_dir(bio) == WRITE) | |
453 | bio_integrity_generate(bio); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | EXPORT_SYMBOL(bio_integrity_prep); | |
458 | ||
459 | /** | |
460 | * bio_integrity_verify - Verify integrity metadata for a bio | |
461 | * @bio: bio to verify | |
462 | * | |
463 | * Description: This function is called to verify the integrity of a | |
464 | * bio. The data in the bio io_vec is compared to the integrity | |
465 | * metadata returned by the HBA. | |
466 | */ | |
467 | static int bio_integrity_verify(struct bio *bio) | |
468 | { | |
bf36f9cf | 469 | return bio_integrity_generate_verify(bio, 0); |
7ba1ba12 MP |
470 | } |
471 | ||
472 | /** | |
473 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
474 | * @work: Work struct stored in bio to be verified | |
475 | * | |
476 | * Description: This workqueue function is called to complete a READ | |
477 | * request. The function verifies the transferred integrity metadata | |
478 | * and then calls the original bio end_io function. | |
479 | */ | |
480 | static void bio_integrity_verify_fn(struct work_struct *work) | |
481 | { | |
b984679e | 482 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
483 | container_of(work, struct bio_integrity_payload, bip_work); |
484 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 485 | int error; |
7ba1ba12 | 486 | |
7b24fc4d | 487 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
488 | |
489 | /* Restore original bio completion handler */ | |
490 | bio->bi_end_io = bip->bip_end_io; | |
196d38bc | 491 | bio_endio_nodec(bio, error); |
7ba1ba12 MP |
492 | } |
493 | ||
494 | /** | |
495 | * bio_integrity_endio - Integrity I/O completion function | |
496 | * @bio: Protected bio | |
497 | * @error: Pointer to errno | |
498 | * | |
499 | * Description: Completion for integrity I/O | |
500 | * | |
501 | * Normally I/O completion is done in interrupt context. However, | |
502 | * verifying I/O integrity is a time-consuming task which must be run | |
503 | * in process context. This function postpones completion | |
504 | * accordingly. | |
505 | */ | |
506 | void bio_integrity_endio(struct bio *bio, int error) | |
507 | { | |
508 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
509 | ||
510 | BUG_ON(bip->bip_bio != bio); | |
511 | ||
7b24fc4d MP |
512 | /* In case of an I/O error there is no point in verifying the |
513 | * integrity metadata. Restore original bio end_io handler | |
514 | * and run it. | |
515 | */ | |
516 | if (error) { | |
517 | bio->bi_end_io = bip->bip_end_io; | |
16f408dc | 518 | bio_endio_nodec(bio, error); |
7b24fc4d MP |
519 | |
520 | return; | |
521 | } | |
522 | ||
7ba1ba12 MP |
523 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
524 | queue_work(kintegrityd_wq, &bip->bip_work); | |
525 | } | |
526 | EXPORT_SYMBOL(bio_integrity_endio); | |
527 | ||
7ba1ba12 MP |
528 | /** |
529 | * bio_integrity_advance - Advance integrity vector | |
530 | * @bio: bio whose integrity vector to update | |
531 | * @bytes_done: number of data bytes that have been completed | |
532 | * | |
533 | * Description: This function calculates how many integrity bytes the | |
534 | * number of completed data bytes correspond to and advances the | |
535 | * integrity vector accordingly. | |
536 | */ | |
537 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
538 | { | |
539 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
540 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
d57a5f7c | 541 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 542 | |
d57a5f7c | 543 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 MP |
544 | } |
545 | EXPORT_SYMBOL(bio_integrity_advance); | |
546 | ||
547 | /** | |
548 | * bio_integrity_trim - Trim integrity vector | |
549 | * @bio: bio whose integrity vector to update | |
550 | * @offset: offset to first data sector | |
551 | * @sectors: number of data sectors | |
552 | * | |
553 | * Description: Used to trim the integrity vector in a cloned bio. | |
554 | * The ivec will be advanced corresponding to 'offset' data sectors | |
555 | * and the length will be truncated corresponding to 'len' data | |
556 | * sectors. | |
557 | */ | |
b984679e JA |
558 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
559 | unsigned int sectors) | |
7ba1ba12 MP |
560 | { |
561 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
562 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
7ba1ba12 | 563 | |
d57a5f7c KO |
564 | bio_integrity_advance(bio, offset << 9); |
565 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); | |
7ba1ba12 MP |
566 | } |
567 | EXPORT_SYMBOL(bio_integrity_trim); | |
568 | ||
7ba1ba12 MP |
569 | /** |
570 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
571 | * @bio: New bio | |
572 | * @bio_src: Original bio | |
87092698 | 573 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
574 | * |
575 | * Description: Called to allocate a bip when cloning a bio | |
576 | */ | |
7878cba9 | 577 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 578 | gfp_t gfp_mask) |
7ba1ba12 MP |
579 | { |
580 | struct bio_integrity_payload *bip_src = bio_src->bi_integrity; | |
581 | struct bio_integrity_payload *bip; | |
582 | ||
583 | BUG_ON(bip_src == NULL); | |
584 | ||
1e2a410f | 585 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
586 | |
587 | if (bip == NULL) | |
588 | return -EIO; | |
589 | ||
590 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
591 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
592 | ||
7ba1ba12 | 593 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 594 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
595 | |
596 | return 0; | |
597 | } | |
598 | EXPORT_SYMBOL(bio_integrity_clone); | |
599 | ||
7878cba9 | 600 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 601 | { |
a91a2785 MP |
602 | if (bs->bio_integrity_pool) |
603 | return 0; | |
604 | ||
9f060e22 | 605 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
bc5c8f07 | 606 | if (!bs->bio_integrity_pool) |
9f060e22 | 607 | return -1; |
7ba1ba12 | 608 | |
a6c39cb4 | 609 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
bc5c8f07 GZ |
610 | if (!bs->bvec_integrity_pool) { |
611 | mempool_destroy(bs->bio_integrity_pool); | |
7878cba9 | 612 | return -1; |
bc5c8f07 | 613 | } |
7878cba9 MP |
614 | |
615 | return 0; | |
616 | } | |
617 | EXPORT_SYMBOL(bioset_integrity_create); | |
618 | ||
619 | void bioset_integrity_free(struct bio_set *bs) | |
620 | { | |
621 | if (bs->bio_integrity_pool) | |
622 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
623 | |
624 | if (bs->bvec_integrity_pool) | |
adbe6991 | 625 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
626 | } |
627 | EXPORT_SYMBOL(bioset_integrity_free); | |
628 | ||
629 | void __init bio_integrity_init(void) | |
630 | { | |
a6e8dc46 TH |
631 | /* |
632 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
633 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
634 | */ | |
635 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
636 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
637 | if (!kintegrityd_wq) |
638 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 639 | |
9f060e22 KO |
640 | bip_slab = kmem_cache_create("bio_integrity_payload", |
641 | sizeof(struct bio_integrity_payload) + | |
642 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
643 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
644 | if (!bip_slab) | |
645 | panic("Failed to create slab\n"); | |
7ba1ba12 | 646 | } |