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block: add a rq_integrity_vec helper

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This provides a nice little shortcut to get the integrity data for
drivers like NVMe that only support a single integrity segment.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
This commit is contained in:
Christoph Hellwig 2019-03-03 08:38:29 -07:00
parent 3aef3cae43
commit 2a876f5e25
1 changed files with 16 additions and 0 deletions
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16
include/linux/blkdev.h
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@ -1559,6 +1559,17 @@ static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
}
/*
* Return the first bvec that contains integrity data. Only drivers that are
* limited to a single integrity segment should use this helper.
*/
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
return NULL;
return rq->bio->bi_integrity->bip_vec;
}
#else /* CONFIG_BLK_DEV_INTEGRITY */
struct bio;
@ -1633,6 +1644,11 @@ static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
return 0;
}
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
return NULL;
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */
struct block_device_operations {