diff options
Diffstat (limited to 'fs/bio-integrity.c')
| -rw-r--r-- | fs/bio-integrity.c | 100 |
1 files changed, 45 insertions, 55 deletions
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c index 4f70f38..1c2ce0c 100644 --- a/fs/bio-integrity.c +++ b/fs/bio-integrity.c @@ -182,6 +182,9 @@ static int bdev_integrity_enabled(struct block_device *bdev, int rw) */ int bio_integrity_enabled(struct bio *bio) { + if (!bio_is_rw(bio)) + return 0; + /* Already protected? */ if (bio_integrity(bio)) return 0; @@ -301,45 +304,65 @@ int bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) EXPORT_SYMBOL(bio_integrity_get_tag); /** - * bio_integrity_generate - Generate integrity metadata for a bio - * @bio: bio to generate integrity metadata for - * - * Description: Generates integrity metadata for a bio by calling the - * block device's generation callback function. The bio must have a - * bip attached with enough room to accommodate the generated - * integrity metadata. + * bio_integrity_generate_verify - Generate/verify integrity metadata for a bio + * @bio: bio to generate/verify integrity metadata for + * @operate: operate number, 1 for generate, 0 for verify */ -static void bio_integrity_generate(struct bio *bio) +static int bio_integrity_generate_verify(struct bio *bio, int operate) { struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); struct blk_integrity_exchg bix; - struct bio_vec bv; - struct bvec_iter iter; - sector_t sector = bio->bi_iter.bi_sector; - unsigned int sectors, total; + struct bio_vec *bv; + sector_t sector; + unsigned int sectors, ret = 0, i; void *prot_buf = bio->bi_integrity->bip_buf; - total = 0; + if (operate) + sector = bio->bi_iter.bi_sector; + else + sector = bio->bi_integrity->bip_iter.bi_sector; + bix.disk_name = bio->bi_bdev->bd_disk->disk_name; bix.sector_size = bi->sector_size; - bio_for_each_segment(bv, bio, iter) { - void *kaddr = kmap_atomic(bv.bv_page); - bix.data_buf = kaddr + bv.bv_offset; - bix.data_size = bv.bv_len; + bio_for_each_segment_all(bv, bio, i) { + void *kaddr = kmap_atomic(bv->bv_page); + bix.data_buf = kaddr + bv->bv_offset; + bix.data_size = bv->bv_len; bix.prot_buf = prot_buf; bix.sector = sector; - bi->generate_fn(&bix); + if (operate) + bi->generate_fn(&bix); + else { + ret = bi->verify_fn(&bix); + if (ret) { + kunmap_atomic(kaddr); + return ret; + } + } - sectors = bv.bv_len / bi->sector_size; + sectors = bv->bv_len / bi->sector_size; sector += sectors; prot_buf += sectors * bi->tuple_size; - total += sectors * bi->tuple_size; - BUG_ON(total > bio->bi_integrity->bip_iter.bi_size); kunmap_atomic(kaddr); } + return ret; +} + +/** + * bio_integrity_generate - Generate integrity metadata for a bio + * @bio: bio to generate integrity metadata for + * + * Description: Generates integrity metadata for a bio by calling the + * block device's generation callback function. The bio must have a + * bip attached with enough room to accommodate the generated + * integrity metadata. + */ +static void bio_integrity_generate(struct bio *bio) +{ + bio_integrity_generate_verify(bio, 1); } static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) @@ -454,40 +477,7 @@ EXPORT_SYMBOL(bio_integrity_prep); */ static int bio_integrity_verify(struct bio *bio) { - struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); - struct blk_integrity_exchg bix; - struct bio_vec *bv; - sector_t sector = bio->bi_integrity->bip_iter.bi_sector; - unsigned int sectors, ret = 0; - void *prot_buf = bio->bi_integrity->bip_buf; - int i; - - bix.disk_name = bio->bi_bdev->bd_disk->disk_name; - bix.sector_size = bi->sector_size; - - bio_for_each_segment_all(bv, bio, i) { - void *kaddr = kmap_atomic(bv->bv_page); - - bix.data_buf = kaddr + bv->bv_offset; - bix.data_size = bv->bv_len; - bix.prot_buf = prot_buf; - bix.sector = sector; - - ret = bi->verify_fn(&bix); - - if (ret) { - kunmap_atomic(kaddr); - return ret; - } - - sectors = bv->bv_len / bi->sector_size; - sector += sectors; - prot_buf += sectors * bi->tuple_size; - - kunmap_atomic(kaddr); - } - - return ret; + return bio_integrity_generate_verify(bio, 0); } /** |
