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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-06-30 20:04:41 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-07-03 13:21:13 +0200 |
| commit | 7ba1ba12eeef0aa7113beb16410ef8b7c748e18b (patch) | |
| tree | 4629aabe88bf095d58eabd2f451207695bb35b08 /block/blk.h | |
| parent | 51d654e1d885607a6edd02b337105fa5c28b6d33 (diff) | |
| download | lwn-7ba1ba12eeef0aa7113beb16410ef8b7c748e18b.tar.gz lwn-7ba1ba12eeef0aa7113beb16410ef8b7c748e18b.zip | |
block: Block layer data integrity support
Some block devices support verifying the integrity of requests by way
of checksums or other protection information that is submitted along
with the I/O.
This patch implements support for generating and verifying integrity
metadata, as well as correctly merging, splitting and cloning bios and
requests that have this extra information attached.
See Documentation/block/data-integrity.txt for more information.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk.h b/block/blk.h index 59776ab4742a..c79f30e1df52 100644 --- a/block/blk.h +++ b/block/blk.h @@ -51,4 +51,12 @@ static inline int queue_congestion_off_threshold(struct request_queue *q) return q->nr_congestion_off; } +#if defined(CONFIG_BLK_DEV_INTEGRITY) + +#define rq_for_each_integrity_segment(bvl, _rq, _iter) \ + __rq_for_each_bio(_iter.bio, _rq) \ + bip_for_each_vec(bvl, _iter.bio->bi_integrity, _iter.i) + +#endif /* BLK_DEV_INTEGRITY */ + #endif |