]>
Commit | Line | Data |
---|---|---|
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; | |
73 | } else { | |
74 | bip->bip_vec = bip->bip_inline_vecs; | |
75 | } | |
76 | ||
7878cba9 | 77 | bip->bip_slab = idx; |
7ba1ba12 MP |
78 | bip->bip_bio = bio; |
79 | bio->bi_integrity = bip; | |
80 | ||
81 | return bip; | |
9f060e22 KO |
82 | err: |
83 | mempool_free(bip, bs->bio_integrity_pool); | |
84 | return NULL; | |
7ba1ba12 | 85 | } |
7ba1ba12 MP |
86 | EXPORT_SYMBOL(bio_integrity_alloc); |
87 | ||
88 | /** | |
89 | * bio_integrity_free - Free bio integrity payload | |
90 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
91 | * |
92 | * Description: Used to free the integrity portion of a bio. Usually | |
93 | * called from bio_free(). | |
94 | */ | |
1e2a410f | 95 | void bio_integrity_free(struct bio *bio) |
7ba1ba12 MP |
96 | { |
97 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
1e2a410f KO |
98 | struct bio_set *bs = bio->bi_pool; |
99 | ||
29ed7813 | 100 | if (bip->bip_owns_buf) |
7ba1ba12 MP |
101 | kfree(bip->bip_buf); |
102 | ||
9f060e22 KO |
103 | if (bs) { |
104 | if (bip->bip_slab != BIO_POOL_NONE) | |
105 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, | |
106 | bip->bip_slab); | |
107 | ||
7878cba9 | 108 | mempool_free(bip, bs->bio_integrity_pool); |
9f060e22 KO |
109 | } else { |
110 | kfree(bip); | |
111 | } | |
7ba1ba12 MP |
112 | |
113 | bio->bi_integrity = NULL; | |
114 | } | |
115 | EXPORT_SYMBOL(bio_integrity_free); | |
116 | ||
08778795 MP |
117 | static inline unsigned int bip_integrity_vecs(struct bio_integrity_payload *bip) |
118 | { | |
119 | if (bip->bip_slab == BIO_POOL_NONE) | |
120 | return BIP_INLINE_VECS; | |
121 | ||
122 | return bvec_nr_vecs(bip->bip_slab); | |
123 | } | |
124 | ||
7ba1ba12 MP |
125 | /** |
126 | * bio_integrity_add_page - Attach integrity metadata | |
127 | * @bio: bio to update | |
128 | * @page: page containing integrity metadata | |
129 | * @len: number of bytes of integrity metadata in page | |
130 | * @offset: start offset within page | |
131 | * | |
132 | * Description: Attach a page containing integrity metadata to bio. | |
133 | */ | |
134 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
135 | unsigned int len, unsigned int offset) | |
136 | { | |
137 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
138 | struct bio_vec *iv; | |
139 | ||
08778795 | 140 | if (bip->bip_vcnt >= bip_integrity_vecs(bip)) { |
7ba1ba12 MP |
141 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
142 | return 0; | |
143 | } | |
144 | ||
d57a5f7c | 145 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 MP |
146 | |
147 | iv->bv_page = page; | |
148 | iv->bv_len = len; | |
149 | iv->bv_offset = offset; | |
150 | bip->bip_vcnt++; | |
151 | ||
152 | return len; | |
153 | } | |
154 | EXPORT_SYMBOL(bio_integrity_add_page); | |
155 | ||
9c02f2b0 JA |
156 | static int bdev_integrity_enabled(struct block_device *bdev, int rw) |
157 | { | |
158 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
159 | ||
160 | if (bi == NULL) | |
161 | return 0; | |
162 | ||
163 | if (rw == READ && bi->verify_fn != NULL && | |
164 | (bi->flags & INTEGRITY_FLAG_READ)) | |
165 | return 1; | |
166 | ||
167 | if (rw == WRITE && bi->generate_fn != NULL && | |
168 | (bi->flags & INTEGRITY_FLAG_WRITE)) | |
169 | return 1; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
7ba1ba12 MP |
174 | /** |
175 | * bio_integrity_enabled - Check whether integrity can be passed | |
176 | * @bio: bio to check | |
177 | * | |
178 | * Description: Determines whether bio_integrity_prep() can be called | |
179 | * on this bio or not. bio data direction and target device must be | |
180 | * set prior to calling. The functions honors the write_generate and | |
181 | * read_verify flags in sysfs. | |
182 | */ | |
183 | int bio_integrity_enabled(struct bio *bio) | |
184 | { | |
185 | /* Already protected? */ | |
186 | if (bio_integrity(bio)) | |
187 | return 0; | |
188 | ||
189 | return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); | |
190 | } | |
191 | EXPORT_SYMBOL(bio_integrity_enabled); | |
192 | ||
193 | /** | |
194 | * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto | |
195 | * @bi: blk_integrity profile for device | |
196 | * @sectors: Number of 512 sectors to convert | |
197 | * | |
198 | * Description: The block layer calculates everything in 512 byte | |
199 | * sectors but integrity metadata is done in terms of the hardware | |
200 | * sector size of the storage device. Convert the block layer sectors | |
201 | * to physical sectors. | |
202 | */ | |
b984679e JA |
203 | static inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, |
204 | unsigned int sectors) | |
7ba1ba12 MP |
205 | { |
206 | /* At this point there are only 512b or 4096b DIF/EPP devices */ | |
207 | if (bi->sector_size == 4096) | |
208 | return sectors >>= 3; | |
209 | ||
210 | return sectors; | |
211 | } | |
212 | ||
d57a5f7c KO |
213 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
214 | unsigned int sectors) | |
215 | { | |
216 | return bio_integrity_hw_sectors(bi, sectors) * bi->tuple_size; | |
217 | } | |
218 | ||
7ba1ba12 MP |
219 | /** |
220 | * bio_integrity_tag_size - Retrieve integrity tag space | |
221 | * @bio: bio to inspect | |
222 | * | |
223 | * Description: Returns the maximum number of tag bytes that can be | |
224 | * attached to this bio. Filesystems can use this to determine how | |
225 | * much metadata to attach to an I/O. | |
226 | */ | |
227 | unsigned int bio_integrity_tag_size(struct bio *bio) | |
228 | { | |
229 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
230 | ||
4f024f37 | 231 | BUG_ON(bio->bi_iter.bi_size == 0); |
7ba1ba12 | 232 | |
4f024f37 | 233 | return bi->tag_size * (bio->bi_iter.bi_size / bi->sector_size); |
7ba1ba12 MP |
234 | } |
235 | EXPORT_SYMBOL(bio_integrity_tag_size); | |
236 | ||
237 | int bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) | |
238 | { | |
239 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
240 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
241 | unsigned int nr_sectors; | |
242 | ||
243 | BUG_ON(bip->bip_buf == NULL); | |
244 | ||
245 | if (bi->tag_size == 0) | |
246 | return -1; | |
247 | ||
b984679e JA |
248 | nr_sectors = bio_integrity_hw_sectors(bi, |
249 | DIV_ROUND_UP(len, bi->tag_size)); | |
7ba1ba12 | 250 | |
d57a5f7c KO |
251 | if (nr_sectors * bi->tuple_size > bip->bip_iter.bi_size) { |
252 | printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", __func__, | |
253 | nr_sectors * bi->tuple_size, bip->bip_iter.bi_size); | |
7ba1ba12 MP |
254 | return -1; |
255 | } | |
256 | ||
257 | if (set) | |
258 | bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
259 | else | |
260 | bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | /** | |
266 | * bio_integrity_set_tag - Attach a tag buffer to a bio | |
267 | * @bio: bio to attach buffer to | |
268 | * @tag_buf: Pointer to a buffer containing tag data | |
269 | * @len: Length of the included buffer | |
270 | * | |
271 | * Description: Use this function to tag a bio by leveraging the extra | |
272 | * space provided by devices formatted with integrity protection. The | |
273 | * size of the integrity buffer must be <= to the size reported by | |
274 | * bio_integrity_tag_size(). | |
275 | */ | |
276 | int bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
277 | { | |
278 | BUG_ON(bio_data_dir(bio) != WRITE); | |
279 | ||
280 | return bio_integrity_tag(bio, tag_buf, len, 1); | |
281 | } | |
282 | EXPORT_SYMBOL(bio_integrity_set_tag); | |
283 | ||
284 | /** | |
285 | * bio_integrity_get_tag - Retrieve a tag buffer from a bio | |
286 | * @bio: bio to retrieve buffer from | |
287 | * @tag_buf: Pointer to a buffer for the tag data | |
288 | * @len: Length of the target buffer | |
289 | * | |
290 | * Description: Use this function to retrieve the tag buffer from a | |
291 | * completed I/O. The size of the integrity buffer must be <= to the | |
292 | * size reported by bio_integrity_tag_size(). | |
293 | */ | |
294 | int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) | |
295 | { | |
296 | BUG_ON(bio_data_dir(bio) != READ); | |
297 | ||
298 | return bio_integrity_tag(bio, tag_buf, len, 0); | |
299 | } | |
300 | EXPORT_SYMBOL(bio_integrity_get_tag); | |
301 | ||
302 | /** | |
303 | * bio_integrity_generate - Generate integrity metadata for a bio | |
304 | * @bio: bio to generate integrity metadata for | |
305 | * | |
306 | * Description: Generates integrity metadata for a bio by calling the | |
307 | * block device's generation callback function. The bio must have a | |
308 | * bip attached with enough room to accommodate the generated | |
309 | * integrity metadata. | |
310 | */ | |
311 | static void bio_integrity_generate(struct bio *bio) | |
312 | { | |
313 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
314 | struct blk_integrity_exchg bix; | |
7988613b KO |
315 | struct bio_vec bv; |
316 | struct bvec_iter iter; | |
4f024f37 | 317 | sector_t sector = bio->bi_iter.bi_sector; |
7988613b | 318 | unsigned int sectors, total; |
7ba1ba12 MP |
319 | void *prot_buf = bio->bi_integrity->bip_buf; |
320 | ||
321 | total = 0; | |
322 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
323 | bix.sector_size = bi->sector_size; | |
324 | ||
7988613b KO |
325 | bio_for_each_segment(bv, bio, iter) { |
326 | void *kaddr = kmap_atomic(bv.bv_page); | |
327 | bix.data_buf = kaddr + bv.bv_offset; | |
328 | bix.data_size = bv.bv_len; | |
7ba1ba12 MP |
329 | bix.prot_buf = prot_buf; |
330 | bix.sector = sector; | |
331 | ||
332 | bi->generate_fn(&bix); | |
333 | ||
7988613b | 334 | sectors = bv.bv_len / bi->sector_size; |
7ba1ba12 MP |
335 | sector += sectors; |
336 | prot_buf += sectors * bi->tuple_size; | |
337 | total += sectors * bi->tuple_size; | |
d57a5f7c | 338 | BUG_ON(total > bio->bi_integrity->bip_iter.bi_size); |
7ba1ba12 | 339 | |
e8e3c3d6 | 340 | kunmap_atomic(kaddr); |
7ba1ba12 MP |
341 | } |
342 | } | |
343 | ||
9c02f2b0 JA |
344 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) |
345 | { | |
346 | if (bi) | |
347 | return bi->tuple_size; | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
7ba1ba12 MP |
352 | /** |
353 | * bio_integrity_prep - Prepare bio for integrity I/O | |
354 | * @bio: bio to prepare | |
355 | * | |
356 | * Description: Allocates a buffer for integrity metadata, maps the | |
357 | * pages and attaches them to a bio. The bio must have data | |
358 | * direction, target device and start sector set priot to calling. In | |
359 | * the WRITE case, integrity metadata will be generated using the | |
360 | * block device's integrity function. In the READ case, the buffer | |
361 | * will be prepared for DMA and a suitable end_io handler set up. | |
362 | */ | |
363 | int bio_integrity_prep(struct bio *bio) | |
364 | { | |
365 | struct bio_integrity_payload *bip; | |
366 | struct blk_integrity *bi; | |
367 | struct request_queue *q; | |
368 | void *buf; | |
369 | unsigned long start, end; | |
370 | unsigned int len, nr_pages; | |
371 | unsigned int bytes, offset, i; | |
372 | unsigned int sectors; | |
373 | ||
374 | bi = bdev_get_integrity(bio->bi_bdev); | |
375 | q = bdev_get_queue(bio->bi_bdev); | |
376 | BUG_ON(bi == NULL); | |
377 | BUG_ON(bio_integrity(bio)); | |
378 | ||
379 | sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); | |
380 | ||
381 | /* Allocate kernel buffer for protection data */ | |
382 | len = sectors * blk_integrity_tuple_size(bi); | |
72f46503 | 383 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
7ba1ba12 MP |
384 | if (unlikely(buf == NULL)) { |
385 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
220eb7fd | 386 | return -ENOMEM; |
7ba1ba12 MP |
387 | } |
388 | ||
389 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
390 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
391 | nr_pages = end - start; | |
392 | ||
393 | /* Allocate bio integrity payload and integrity vectors */ | |
394 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
395 | if (unlikely(bip == NULL)) { | |
396 | printk(KERN_ERR "could not allocate data integrity bioset\n"); | |
397 | kfree(buf); | |
398 | return -EIO; | |
399 | } | |
400 | ||
29ed7813 | 401 | bip->bip_owns_buf = 1; |
7ba1ba12 | 402 | bip->bip_buf = buf; |
d57a5f7c KO |
403 | bip->bip_iter.bi_size = len; |
404 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; | |
7ba1ba12 MP |
405 | |
406 | /* Map it */ | |
407 | offset = offset_in_page(buf); | |
408 | for (i = 0 ; i < nr_pages ; i++) { | |
409 | int ret; | |
410 | bytes = PAGE_SIZE - offset; | |
411 | ||
412 | if (len <= 0) | |
413 | break; | |
414 | ||
415 | if (bytes > len) | |
416 | bytes = len; | |
417 | ||
418 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
419 | bytes, offset); | |
420 | ||
421 | if (ret == 0) | |
422 | return 0; | |
423 | ||
424 | if (ret < bytes) | |
425 | break; | |
426 | ||
427 | buf += bytes; | |
428 | len -= bytes; | |
429 | offset = 0; | |
430 | } | |
431 | ||
432 | /* Install custom I/O completion handler if read verify is enabled */ | |
433 | if (bio_data_dir(bio) == READ) { | |
434 | bip->bip_end_io = bio->bi_end_io; | |
435 | bio->bi_end_io = bio_integrity_endio; | |
436 | } | |
437 | ||
438 | /* Auto-generate integrity metadata if this is a write */ | |
439 | if (bio_data_dir(bio) == WRITE) | |
440 | bio_integrity_generate(bio); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | EXPORT_SYMBOL(bio_integrity_prep); | |
445 | ||
446 | /** | |
447 | * bio_integrity_verify - Verify integrity metadata for a bio | |
448 | * @bio: bio to verify | |
449 | * | |
450 | * Description: This function is called to verify the integrity of a | |
451 | * bio. The data in the bio io_vec is compared to the integrity | |
452 | * metadata returned by the HBA. | |
453 | */ | |
454 | static int bio_integrity_verify(struct bio *bio) | |
455 | { | |
456 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
457 | struct blk_integrity_exchg bix; | |
5837c80e | 458 | struct bio_vec *bv; |
d57a5f7c | 459 | sector_t sector = bio->bi_integrity->bip_iter.bi_sector; |
7988613b | 460 | unsigned int sectors, total, ret; |
7ba1ba12 | 461 | void *prot_buf = bio->bi_integrity->bip_buf; |
5837c80e | 462 | int i; |
7ba1ba12 MP |
463 | |
464 | ret = total = 0; | |
465 | bix.disk_name = bio->bi_bdev->bd_disk->disk_name; | |
466 | bix.sector_size = bi->sector_size; | |
467 | ||
5837c80e NB |
468 | bio_for_each_segment_all(bv, bio, i) { |
469 | void *kaddr = kmap_atomic(bv->bv_page); | |
470 | ||
471 | bix.data_buf = kaddr + bv->bv_offset; | |
472 | bix.data_size = bv->bv_len; | |
7ba1ba12 MP |
473 | bix.prot_buf = prot_buf; |
474 | bix.sector = sector; | |
475 | ||
476 | ret = bi->verify_fn(&bix); | |
477 | ||
478 | if (ret) { | |
e8e3c3d6 | 479 | kunmap_atomic(kaddr); |
7b24fc4d | 480 | return ret; |
7ba1ba12 MP |
481 | } |
482 | ||
5837c80e | 483 | sectors = bv->bv_len / bi->sector_size; |
7ba1ba12 MP |
484 | sector += sectors; |
485 | prot_buf += sectors * bi->tuple_size; | |
486 | total += sectors * bi->tuple_size; | |
d57a5f7c | 487 | BUG_ON(total > bio->bi_integrity->bip_iter.bi_size); |
7ba1ba12 | 488 | |
e8e3c3d6 | 489 | kunmap_atomic(kaddr); |
7ba1ba12 MP |
490 | } |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
495 | /** | |
496 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
497 | * @work: Work struct stored in bio to be verified | |
498 | * | |
499 | * Description: This workqueue function is called to complete a READ | |
500 | * request. The function verifies the transferred integrity metadata | |
501 | * and then calls the original bio end_io function. | |
502 | */ | |
503 | static void bio_integrity_verify_fn(struct work_struct *work) | |
504 | { | |
b984679e | 505 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
506 | container_of(work, struct bio_integrity_payload, bip_work); |
507 | struct bio *bio = bip->bip_bio; | |
7b24fc4d | 508 | int error; |
7ba1ba12 | 509 | |
7b24fc4d | 510 | error = bio_integrity_verify(bio); |
7ba1ba12 MP |
511 | |
512 | /* Restore original bio completion handler */ | |
513 | bio->bi_end_io = bip->bip_end_io; | |
196d38bc | 514 | bio_endio_nodec(bio, error); |
7ba1ba12 MP |
515 | } |
516 | ||
517 | /** | |
518 | * bio_integrity_endio - Integrity I/O completion function | |
519 | * @bio: Protected bio | |
520 | * @error: Pointer to errno | |
521 | * | |
522 | * Description: Completion for integrity I/O | |
523 | * | |
524 | * Normally I/O completion is done in interrupt context. However, | |
525 | * verifying I/O integrity is a time-consuming task which must be run | |
526 | * in process context. This function postpones completion | |
527 | * accordingly. | |
528 | */ | |
529 | void bio_integrity_endio(struct bio *bio, int error) | |
530 | { | |
531 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
532 | ||
533 | BUG_ON(bip->bip_bio != bio); | |
534 | ||
7b24fc4d MP |
535 | /* In case of an I/O error there is no point in verifying the |
536 | * integrity metadata. Restore original bio end_io handler | |
537 | * and run it. | |
538 | */ | |
539 | if (error) { | |
540 | bio->bi_end_io = bip->bip_end_io; | |
541 | bio_endio(bio, error); | |
542 | ||
543 | return; | |
544 | } | |
545 | ||
7ba1ba12 MP |
546 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
547 | queue_work(kintegrityd_wq, &bip->bip_work); | |
548 | } | |
549 | EXPORT_SYMBOL(bio_integrity_endio); | |
550 | ||
7ba1ba12 MP |
551 | /** |
552 | * bio_integrity_advance - Advance integrity vector | |
553 | * @bio: bio whose integrity vector to update | |
554 | * @bytes_done: number of data bytes that have been completed | |
555 | * | |
556 | * Description: This function calculates how many integrity bytes the | |
557 | * number of completed data bytes correspond to and advances the | |
558 | * integrity vector accordingly. | |
559 | */ | |
560 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
561 | { | |
562 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
563 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
d57a5f7c | 564 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 565 | |
d57a5f7c | 566 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 MP |
567 | } |
568 | EXPORT_SYMBOL(bio_integrity_advance); | |
569 | ||
570 | /** | |
571 | * bio_integrity_trim - Trim integrity vector | |
572 | * @bio: bio whose integrity vector to update | |
573 | * @offset: offset to first data sector | |
574 | * @sectors: number of data sectors | |
575 | * | |
576 | * Description: Used to trim the integrity vector in a cloned bio. | |
577 | * The ivec will be advanced corresponding to 'offset' data sectors | |
578 | * and the length will be truncated corresponding to 'len' data | |
579 | * sectors. | |
580 | */ | |
b984679e JA |
581 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
582 | unsigned int sectors) | |
7ba1ba12 MP |
583 | { |
584 | struct bio_integrity_payload *bip = bio->bi_integrity; | |
585 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); | |
7ba1ba12 | 586 | |
d57a5f7c KO |
587 | bio_integrity_advance(bio, offset << 9); |
588 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); | |
7ba1ba12 MP |
589 | } |
590 | EXPORT_SYMBOL(bio_integrity_trim); | |
591 | ||
7ba1ba12 MP |
592 | /** |
593 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
594 | * @bio: New bio | |
595 | * @bio_src: Original bio | |
87092698 | 596 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
597 | * |
598 | * Description: Called to allocate a bip when cloning a bio | |
599 | */ | |
7878cba9 | 600 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 601 | gfp_t gfp_mask) |
7ba1ba12 MP |
602 | { |
603 | struct bio_integrity_payload *bip_src = bio_src->bi_integrity; | |
604 | struct bio_integrity_payload *bip; | |
605 | ||
606 | BUG_ON(bip_src == NULL); | |
607 | ||
1e2a410f | 608 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7ba1ba12 MP |
609 | |
610 | if (bip == NULL) | |
611 | return -EIO; | |
612 | ||
613 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
614 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
615 | ||
7ba1ba12 | 616 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 617 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
618 | |
619 | return 0; | |
620 | } | |
621 | EXPORT_SYMBOL(bio_integrity_clone); | |
622 | ||
7878cba9 | 623 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 624 | { |
a91a2785 MP |
625 | if (bs->bio_integrity_pool) |
626 | return 0; | |
627 | ||
9f060e22 | 628 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
bc5c8f07 | 629 | if (!bs->bio_integrity_pool) |
9f060e22 | 630 | return -1; |
7ba1ba12 | 631 | |
bc5c8f07 GZ |
632 | bs->bvec_integrity_pool = biovec_create_pool(bs, pool_size); |
633 | if (!bs->bvec_integrity_pool) { | |
634 | mempool_destroy(bs->bio_integrity_pool); | |
7878cba9 | 635 | return -1; |
bc5c8f07 | 636 | } |
7878cba9 MP |
637 | |
638 | return 0; | |
639 | } | |
640 | EXPORT_SYMBOL(bioset_integrity_create); | |
641 | ||
642 | void bioset_integrity_free(struct bio_set *bs) | |
643 | { | |
644 | if (bs->bio_integrity_pool) | |
645 | mempool_destroy(bs->bio_integrity_pool); | |
9f060e22 KO |
646 | |
647 | if (bs->bvec_integrity_pool) | |
adbe6991 | 648 | mempool_destroy(bs->bvec_integrity_pool); |
7878cba9 MP |
649 | } |
650 | EXPORT_SYMBOL(bioset_integrity_free); | |
651 | ||
652 | void __init bio_integrity_init(void) | |
653 | { | |
a6e8dc46 TH |
654 | /* |
655 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
656 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
657 | */ | |
658 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
659 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
660 | if (!kintegrityd_wq) |
661 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 662 | |
9f060e22 KO |
663 | bip_slab = kmem_cache_create("bio_integrity_payload", |
664 | sizeof(struct bio_integrity_payload) + | |
665 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
666 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
667 | if (!bip_slab) | |
668 | panic("Failed to create slab\n"); | |
7ba1ba12 | 669 | } |