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author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-01 19:19:15 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-01 19:19:15 -0700 |
commit | 7a48837732f87a574ee3e1855927dc250117f565 (patch) | |
tree | f2e975a347d6d489e9f1932f9864fc978910def0 /fs/bio-integrity.c | |
parent | 1a0b6abaea78f73d9bc0a2f6df2d9e4c917cade1 (diff) | |
parent | 27fbf4e87c16bb3e40730890169a643a494b7c64 (diff) | |
download | linux-stable-7a48837732f87a574ee3e1855927dc250117f565.tar.gz linux-stable-7a48837732f87a574ee3e1855927dc250117f565.tar.bz2 linux-stable-7a48837732f87a574ee3e1855927dc250117f565.zip |
Merge branch 'for-3.15/core' of git://git.kernel.dk/linux-block
Pull core block layer updates from Jens Axboe:
"This is the pull request for the core block IO bits for the 3.15
kernel. It's a smaller round this time, it contains:
- Various little blk-mq fixes and additions from Christoph and
myself.
- Cleanup of the IPI usage from the block layer, and associated
helper code. From Frederic Weisbecker and Jan Kara.
- Duplicate code cleanup in bio-integrity from Gu Zheng. This will
give you a merge conflict, but that should be easy to resolve.
- blk-mq notify spinlock fix for RT from Mike Galbraith.
- A blktrace partial accounting bug fix from Roman Pen.
- Missing REQ_SYNC detection fix for blk-mq from Shaohua Li"
* 'for-3.15/core' of git://git.kernel.dk/linux-block: (25 commits)
blk-mq: add REQ_SYNC early
rt,blk,mq: Make blk_mq_cpu_notify_lock a raw spinlock
blk-mq: support partial I/O completions
blk-mq: merge blk_mq_insert_request and blk_mq_run_request
blk-mq: remove blk_mq_alloc_rq
blk-mq: don't dump CPU -> hw queue map on driver load
blk-mq: fix wrong usage of hctx->state vs hctx->flags
blk-mq: allow blk_mq_init_commands() to return failure
block: remove old blk_iopoll_enabled variable
blktrace: fix accounting of partially completed requests
smp: Rename __smp_call_function_single() to smp_call_function_single_async()
smp: Remove wait argument from __smp_call_function_single()
watchdog: Simplify a little the IPI call
smp: Move __smp_call_function_single() below its safe version
smp: Consolidate the various smp_call_function_single() declensions
smp: Teach __smp_call_function_single() to check for offline cpus
smp: Remove unused list_head from csd
smp: Iterate functions through llist_for_each_entry_safe()
block: Stop abusing rq->csd.list in blk-softirq
block: Remove useless IPI struct initialization
...
Diffstat (limited to 'fs/bio-integrity.c')
-rw-r--r-- | fs/bio-integrity.c | 84 |
1 files changed, 36 insertions, 48 deletions
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c index 4f70f383132c..29696b78d1f4 100644 --- a/fs/bio-integrity.c +++ b/fs/bio-integrity.c @@ -301,25 +301,25 @@ 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; + sector_t sector; + unsigned int sectors, ret = 0; 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; @@ -330,16 +330,37 @@ static void bio_integrity_generate(struct bio *bio) 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; 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 +475,7 @@ 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); } /** |