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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) |
7ba1ba12 MP |
104 | kfree(bip->bip_buf); |
105 | ||
9f060e22 KO |
106 | if (bs) { |
107 | if (bip->bip_slab != BIO_POOL_NONE) | |
108 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, | |
109 | bip->bip_slab); | |
110 | ||
7878cba9 | 111 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
112 | } else { |
113 | kfree(bip); | |
114 | } | |
7ba1ba12 MP |
115 | |
116 | bio->bi_integrity = NULL; | |
117 | } | |
118 | EXPORT_SYMBOL(bio_integrity_free); | |
119 | ||
120 | /** | |
121 | * bio_integrity_add_page - Attach integrity metadata | |
122 | * @bio: bio to update | |
123 | * @page: page containing integrity metadata | |
124 | * @len: number of bytes of integrity metadata in page | |
125 | * @offset: start offset within page | |
126 | * | |
127 | * Description: Attach a page containing integrity metadata to bio. | |
128 | */ | |
129 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
130 | unsigned int len, unsigned int offset) | |
131 | { | |
180b2f95 | 132 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
133 | struct bio_vec *iv; |
134 | ||
cbcd1054 | 135 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
7ba1ba12 MP |
136 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
137 | return 0; | |
138 | } | |
139 | ||
d57a5f7c | 140 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 MP |
141 | |
142 | iv->bv_page = page; | |
143 | iv->bv_len = len; | |
144 | iv->bv_offset = offset; | |
145 | bip->bip_vcnt++; | |
146 | ||
147 | return len; | |
148 | } | |
149 | EXPORT_SYMBOL(bio_integrity_add_page); | |
150 | ||
151 | /** | |
152 | * bio_integrity_enabled - Check whether integrity can be passed | |
153 | * @bio: bio to check | |
154 | * | |
155 | * Description: Determines whether bio_integrity_prep() can be called | |
156 | * on this bio or not. bio data direction and target device must be | |
157 | * set prior to calling. The functions honors the write_generate and | |
158 | * read_verify flags in sysfs. | |
159 | */ | |
e7258c1a | 160 | bool bio_integrity_enabled(struct bio *bio) |
7ba1ba12 | 161 | { |
e7258c1a MP |
162 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
163 | ||
e69f18f0 | 164 | if (!bio_is_rw(bio)) |
e7258c1a | 165 | return false; |
e69f18f0 | 166 | |
7ba1ba12 MP |
167 | /* Already protected? */ |
168 | if (bio_integrity(bio)) | |
e7258c1a MP |
169 | return false; |
170 | ||
171 | if (bi == NULL) | |
172 | return false; | |
173 | ||
174 | if (bio_data_dir(bio) == READ && bi->verify_fn != NULL && | |
175 | (bi->flags & INTEGRITY_FLAG_READ)) | |
176 | return true; | |
177 | ||
178 | if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL && | |
179 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
180 | return true; | |
7ba1ba12 | 181 | |
e7258c1a | 182 | return false; |
7ba1ba12 MP |
183 | } |
184 | EXPORT_SYMBOL(bio_integrity_enabled); | |
185 | ||
186 | /** | |
187 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto | |
188 | * @bi: blk_integrity profile for device | |
189 | * @sectors: Number of 512 sectors to convert | |
190 | * | |
191 | * Description: The block layer calculates everything in 512 byte | |
192 | * sectors but integrity metadata is done in terms of the hardware | |
193 | * sector size of the storage device. Convert the block layer sectors | |
194 | * to physical sectors. | |
195 | */ | |
b984679e JA |
196 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
197 | unsigned int sectors) | |
7ba1ba12 MP |
198 | { |
199 | /* At this point there are only 512b or 4096b DIF/EPP devices */ | |
200 | if (bi->sector_size == 4096) | |
201 | return sectors >>= 3; | |
202 | ||
203 | return sectors; | |
204 | } | |
205 | ||
d57a5f7c KO |
206 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
207 | unsigned int sectors) | |
208 | { | |
209 | return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size; | |
210 | } | |
211 | ||
7ba1ba12 MP |
212 | /** |
213 | * bio_integrity_tag_size - Retrieve integrity tag space | |
214 | * @bio: bio to inspect | |
215 | * | |
216 | * Description: Returns the maximum number of tag bytes that can be | |
217 | * attached to this bio. Filesystems can use this to determine how | |
218 | * much metadata to attach to an I/O. | |
219 | */ | |
220 | unsigned int bio_integrity_tag_size(struct bio *bio) | |
221 | { | |
222 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
223 | ||
4f024f37 | 224 | BUG_ON(bio->bi_iter.bi_size == 0); |
7ba1ba12 | 225 | |
4f024f37 | 226 | return bi->tag_size * (bio->bi_iter.bi_size / bi->sector_size); |
7ba1ba12 MP |
227 | } |
228 | EXPORT_SYMBOL(bio_integrity_tag_size); | |
229 | ||
0b4ef8de RK |
230 | static int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, |
231 | int set) | |
7ba1ba12 | 232 | { |
180b2f95 | 233 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
234 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
235 | unsigned int nr_sectors; | |
236 | ||
237 | BUG_ON(bip->bip_buf == NULL); | |
238 | ||
239 | if (bi->tag_size == 0) | |
240 | return -1; | |
241 | ||
b984679e JA |
242 | nr_sectors = bio_integrity_hw_sectors(bi, |
243 | DIV_ROUND_UP(len, bi->tag_size)); | |
7ba1ba12 | 244 | |
d57a5f7c KO |
245 | if (nr_sectors * bi->tuple_size > bip->bip_iter.bi_size) { |
246 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", __func__, | |
247 | nr_sectors * bi->tuple_size, bip->bip_iter.bi_size); | |
7ba1ba12 MP |
248 | return -1; |
249 | } | |
250 | ||
251 | if (set) | |
252 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
253 | else | |
254 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | /** | |
260 | * bio_integrity_set_tag - Attach a tag buffer to a bio | |
261 | * @bio: bio to attach buffer to | |
262 | * @tag_buf: Pointer to a buffer containing tag data | |
263 | * @len: Length of the included buffer | |
264 | * | |
265 | * Description: Use this function to tag a bio by leveraging the extra | |
266 | * space provided by devices formatted with integrity protection. The | |
267 | * size of the integrity buffer must be <= to the size reported by | |
268 | * bio_integrity_tag_size(). | |
269 | */ | |
270 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
271 | { | |
272 | BUG_ON(bio_data_dir(bio) != WRITE); | |
273 | ||
274 | return bio_integrity_tag(bio, tag_buf, len, 1); | |
275 | } | |
276 | EXPORT_SYMBOL(bio_integrity_set_tag); | |
277 | ||
278 | /** | |
279 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio | |
280 | * @bio: bio to retrieve buffer from | |
281 | * @tag_buf: Pointer to a buffer for the tag data | |
282 | * @len: Length of the target buffer | |
283 | * | |
284 | * Description: Use this function to retrieve the tag buffer from a | |
285 | * completed I/O. The size of the integrity buffer must be <= to the | |
286 | * size reported by bio_integrity_tag_size(). | |
287 | */ | |
288 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
289 | { | |
290 | BUG_ON(bio_data_dir(bio) != READ); | |
291 | ||
292 | return bio_integrity_tag(bio, tag_buf, len, 0); | |
293 | } | |
294 | EXPORT_SYMBOL(bio_integrity_get_tag); | |
295 | ||
296 | /** | |
bf36f9cf GZ |
297 | * bio_integrity_generate_verify - Generate/verify integrity metadata for a bio |
298 | * @bio: bio to generate/verify integrity metadata for | |
299 | * @operate: operate number, 1 for generate, 0 for verify | |
7ba1ba12 | 300 | */ |
bf36f9cf | 301 | static int bio_integrity_generate_verify(struct bio *bio, int operate) |
7ba1ba12 MP |
302 | { |
303 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
304 | struct blk_integrity_exchg bix; | |
0bc69973 | 305 | struct bio_vec *bv; |
bf36f9cf | 306 | sector_t sector; |
0bc69973 | 307 | unsigned int sectors, ret = 0, i; |
180b2f95 | 308 | void *prot_buf = bio_integrity(bio)->bip_buf; |
7ba1ba12 | 309 | |
bf36f9cf GZ |
310 | if (operate) |
311 | sector = bio->bi_iter.bi_sector; | |
312 | else | |
180b2f95 | 313 | sector = bio_integrity(bio)->bip_iter.bi_sector; |
bf36f9cf | 314 | |
7ba1ba12 MP |
315 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; |
316 | bix.sector_size = bi->sector_size; | |
317 | ||
0bc69973 MP |
318 | bio_for_each_segment_all(bv, bio, i) { |
319 | void *kaddr = kmap_atomic(bv->bv_page); | |
320 | bix.data_buf = kaddr + bv->bv_offset; | |
321 | bix.data_size = bv->bv_len; | |
7ba1ba12 MP |
322 | bix.prot_buf = prot_buf; |
323 | bix.sector = sector; | |
324 | ||
0bc69973 | 325 | if (operate) |
bf36f9cf | 326 | bi->generate_fn(&bix); |
0bc69973 | 327 | else { |
bf36f9cf GZ |
328 | ret = bi->verify_fn(&bix); |
329 | if (ret) { | |
330 | kunmap_atomic(kaddr); | |
331 | return ret; | |
332 | } | |
333 | } | |
7ba1ba12 | 334 | |
0bc69973 | 335 | sectors = bv->bv_len / bi->sector_size; |
7ba1ba12 MP |
336 | sector += sectors; |
337 | prot_buf += sectors * bi->tuple_size; | |
7ba1ba12 | 338 | |
e8e3c3d6 | 339 | kunmap_atomic(kaddr); |
7ba1ba12 | 340 | } |
bf36f9cf GZ |
341 | return ret; |
342 | } | |
343 | ||
344 | /** | |
345 | * bio_integrity_generate - Generate integrity metadata for a bio | |
346 | * @bio: bio to generate integrity metadata for | |
347 | * | |
348 | * Description: Generates integrity metadata for a bio by calling the | |
349 | * block device's generation callback function. The bio must have a | |
350 | * bip attached with enough room to accommodate the generated | |
351 | * integrity metadata. | |
352 | */ | |
353 | static void bio_integrity_generate(struct bio *bio) | |
354 | { | |
355 | bio_integrity_generate_verify(bio, 1); | |
7ba1ba12 MP |
356 | } |
357 | ||
9c02f2b0 JA |
358 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
359 | { | |
360 | if (bi) | |
361 | return bi->tuple_size; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
7ba1ba12 MP |
366 | /** |
367 | * bio_integrity_prep - Prepare bio for integrity I/O | |
368 | * @bio: bio to prepare | |
369 | * | |
370 | * Description: Allocates a buffer for integrity metadata, maps the | |
371 | * pages and attaches them to a bio. The bio must have data | |
372 | * direction, target device and start sector set priot to calling. In | |
373 | * the WRITE case, integrity metadata will be generated using the | |
374 | * block device's integrity function. In the READ case, the buffer | |
375 | * will be prepared for DMA and a suitable end_io handler set up. | |
376 | */ | |
377 | int bio_integrity_prep(struct bio *bio) | |
378 | { | |
379 | struct bio_integrity_payload *bip; | |
380 | struct blk_integrity *bi; | |
381 | struct request_queue *q; | |
382 | void *buf; | |
383 | unsigned long start, end; | |
384 | unsigned int len, nr_pages; | |
385 | unsigned int bytes, offset, i; | |
386 | unsigned int sectors; | |
387 | ||
388 | bi = bdev_get_integrity(bio->bi_bdev); | |
389 | q = bdev_get_queue(bio->bi_bdev); | |
390 | BUG_ON(bi == NULL); | |
391 | BUG_ON(bio_integrity(bio)); | |
392 | ||
393 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); | |
394 | ||
395 | /* Allocate kernel buffer for protection data */ | |
396 | len = sectors * blk_integrity_tuple_size(bi); | |
72f46503 | 397 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
398 | if (unlikely(buf == NULL)) { |
399 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 400 | return -ENOMEM; |
7ba1ba12 MP |
401 | } |
402 | ||
403 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
404 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
405 | nr_pages = end - start; | |
406 | ||
407 | /* Allocate bio integrity payload and integrity vectors */ | |
408 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
409 | if (unlikely(bip == NULL)) { | |
410 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
411 | kfree(buf); | |
412 | return -EIO; | |
413 | } | |
414 | ||
29ed7813 | 415 | bip->bip_owns_buf = 1; |
7ba1ba12 | 416 | bip->bip_buf = buf; |
d57a5f7c KO |
417 | bip->bip_iter.bi_size = len; |
418 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; | |
7ba1ba12 MP |
419 | |
420 | /* Map it */ | |
421 | offset = offset_in_page(buf); | |
422 | for (i = 0 ; i < nr_pages ; i++) { | |
423 | int ret; | |
424 | bytes = PAGE_SIZE - offset; | |
425 | ||
426 | if (len <= 0) | |
427 | break; | |
428 | ||
429 | if (bytes > len) | |
430 | bytes = len; | |
431 | ||
432 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
433 | bytes, offset); | |
434 | ||
435 | if (ret == 0) | |
436 | return 0; | |
437 | ||
438 | if (ret < bytes) | |
439 | break; | |
440 | ||
441 | buf += bytes; | |
442 | len -= bytes; | |
443 | offset = 0; | |
444 | } | |
445 | ||
446 | /* Install custom I/O completion handler if read verify is enabled */ | |
447 | if (bio_data_dir(bio) == READ) { | |
448 | bip->bip_end_io = bio->bi_end_io; | |
449 | bio->bi_end_io = bio_integrity_endio; | |
450 | } | |
451 | ||
452 | /* Auto-generate integrity metadata if this is a write */ | |
453 | if (bio_data_dir(bio) == WRITE) | |
454 | bio_integrity_generate(bio); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | EXPORT_SYMBOL(bio_integrity_prep); | |
459 | ||
460 | /** | |
461 | * bio_integrity_verify - Verify integrity metadata for a bio | |
462 | * @bio: bio to verify | |
463 | * | |
464 | * Description: This function is called to verify the integrity of a | |
465 | * bio. The data in the bio io_vec is compared to the integrity | |
466 | * metadata returned by the HBA. | |
467 | */ | |
468 | static int bio_integrity_verify(struct bio *bio) | |
469 | { | |
bf36f9cf | 470 | return bio_integrity_generate_verify(bio, 0); |
7ba1ba12 MP |
471 | } |
472 | ||
473 | /** | |
474 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
475 | * @work: Work struct stored in bio to be verified | |
476 | * | |
477 | * Description: This workqueue function is called to complete a READ | |
478 | * request. The function verifies the transferred integrity metadata | |
479 | * and then calls the original bio end_io function. | |
480 | */ | |
481 | static void bio_integrity_verify_fn(struct work_struct *work) | |
482 | { | |
b984679e | 483 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
484 | container_of(work, struct bio_integrity_payload, bip_work); |
485 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 486 | int error; |
7ba1ba12 | 487 | |
7b24fc4d | 488 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
489 | |
490 | /* Restore original bio completion handler */ | |
491 | bio->bi_end_io = bip->bip_end_io; | |
196d38bc | 492 | bio_endio_nodec(bio, error); |
7ba1ba12 MP |
493 | } |
494 | ||
495 | /** | |
496 | * bio_integrity_endio - Integrity I/O completion function | |
497 | * @bio: Protected bio | |
498 | * @error: Pointer to errno | |
499 | * | |
500 | * Description: Completion for integrity I/O | |
501 | * | |
502 | * Normally I/O completion is done in interrupt context. However, | |
503 | * verifying I/O integrity is a time-consuming task which must be run | |
504 | * in process context. This function postpones completion | |
505 | * accordingly. | |
506 | */ | |
507 | void bio_integrity_endio(struct bio *bio, int error) | |
508 | { | |
180b2f95 | 509 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
510 | |
511 | BUG_ON(bip->bip_bio != bio); | |
512 | ||
7b24fc4d MP |
513 | /* In case of an I/O error there is no point in verifying the |
514 | * integrity metadata. Restore original bio end_io handler | |
515 | * and run it. | |
516 | */ | |
517 | if (error) { | |
518 | bio->bi_end_io = bip->bip_end_io; | |
16f408dc | 519 | bio_endio_nodec(bio, error); |
7b24fc4d MP |
520 | |
521 | return; | |
522 | } | |
523 | ||
7ba1ba12 MP |
524 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
525 | queue_work(kintegrityd_wq, &bip->bip_work); | |
526 | } | |
527 | EXPORT_SYMBOL(bio_integrity_endio); | |
528 | ||
7ba1ba12 MP |
529 | /** |
530 | * bio_integrity_advance - Advance integrity vector | |
531 | * @bio: bio whose integrity vector to update | |
532 | * @bytes_done: number of data bytes that have been completed | |
533 | * | |
534 | * Description: This function calculates how many integrity bytes the | |
535 | * number of completed data bytes correspond to and advances the | |
536 | * integrity vector accordingly. | |
537 | */ | |
538 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
539 | { | |
180b2f95 | 540 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 541 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
d57a5f7c | 542 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 543 | |
d57a5f7c | 544 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 MP |
545 | } |
546 | EXPORT_SYMBOL(bio_integrity_advance); | |
547 | ||
548 | /** | |
549 | * bio_integrity_trim - Trim integrity vector | |
550 | * @bio: bio whose integrity vector to update | |
551 | * @offset: offset to first data sector | |
552 | * @sectors: number of data sectors | |
553 | * | |
554 | * Description: Used to trim the integrity vector in a cloned bio. | |
555 | * The ivec will be advanced corresponding to 'offset' data sectors | |
556 | * and the length will be truncated corresponding to 'len' data | |
557 | * sectors. | |
558 | */ | |
b984679e JA |
559 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
560 | unsigned int sectors) | |
7ba1ba12 | 561 | { |
180b2f95 | 562 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 | 563 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
7ba1ba12 | 564 | |
d57a5f7c KO |
565 | bio_integrity_advance(bio, offset << 9); |
566 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); | |
7ba1ba12 MP |
567 | } |
568 | EXPORT_SYMBOL(bio_integrity_trim); | |
569 | ||
7ba1ba12 MP |
570 | /** |
571 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
572 | * @bio: New bio | |
573 | * @bio_src: Original bio | |
87092698 | 574 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
575 | * |
576 | * Description: Called to allocate a bip when cloning a bio | |
577 | */ | |
7878cba9 | 578 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 579 | gfp_t gfp_mask) |
7ba1ba12 | 580 | { |
180b2f95 | 581 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
7ba1ba12 MP |
582 | struct bio_integrity_payload *bip; |
583 | ||
584 | BUG_ON(bip_src == NULL); | |
585 | ||
1e2a410f | 586 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
587 | |
588 | if (bip == NULL) | |
589 | return -EIO; | |
590 | ||
591 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
592 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
593 | ||
7ba1ba12 | 594 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 595 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
596 | |
597 | return 0; | |
598 | } | |
599 | EXPORT_SYMBOL(bio_integrity_clone); | |
600 | ||
7878cba9 | 601 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 602 | { |
a91a2785 MP |
603 | if (bs->bio_integrity_pool) |
604 | return 0; | |
605 | ||
9f060e22 | 606 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
bc5c8f07 | 607 | if (!bs->bio_integrity_pool) |
9f060e22 | 608 | return -1; |
7ba1ba12 | 609 | |
a6c39cb4 | 610 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
bc5c8f07 GZ |
611 | if (!bs->bvec_integrity_pool) { |
612 | mempool_destroy(bs->bio_integrity_pool); | |
7878cba9 | 613 | return -1; |
bc5c8f07 | 614 | } |
7878cba9 MP |
615 | |
616 | return 0; | |
617 | } | |
618 | EXPORT_SYMBOL(bioset_integrity_create); | |
619 | ||
620 | void bioset_integrity_free(struct bio_set *bs) | |
621 | { | |
622 | if (bs->bio_integrity_pool) | |
623 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
624 | |
625 | if (bs->bvec_integrity_pool) | |
adbe6991 | 626 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
627 | } |
628 | EXPORT_SYMBOL(bioset_integrity_free); | |
629 | ||
630 | void __init bio_integrity_init(void) | |
631 | { | |
a6e8dc46 TH |
632 | /* |
633 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
634 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
635 | */ | |
636 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
637 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
638 | if (!kintegrityd_wq) |
639 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 640 | |
9f060e22 KO |
641 | bip_slab = kmem_cache_create("bio_integrity_payload", |
642 | sizeof(struct bio_integrity_payload) + | |
643 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
644 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
645 | if (!bip_slab) | |
646 | panic("Failed to create slab\n"); | |
7ba1ba12 | 647 | } |