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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/elevator.c | |
| 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/elevator.c')
| -rw-r--r-- | block/elevator.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c index 902dd1344d56..1f5bfe696026 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -86,6 +86,12 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio) if (rq->rq_disk != bio->bi_bdev->bd_disk || rq->special) return 0; + /* + * only merge integrity protected bio into ditto rq + */ + if (bio_integrity(bio) != blk_integrity_rq(rq)) + return 0; + if (!elv_iosched_allow_merge(rq, bio)) return 0; |