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block: Block layer data integrity support

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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>
This commit is contained in:
Martin K. Petersen
2008-06-30 20:04:41 +02:00
committed by Jens Axboe
parent 51d654e1d8
commit 7ba1ba12ee
13 changed files with 1355 additions and 7 deletions
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block/blk-merge.c
+3
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@@ -441,6 +441,9 @@ static int attempt_merge(struct request_queue *q, struct request *req,
|| next->special)
return 0;
if (blk_integrity_rq(req) != blk_integrity_rq(next))
return 0;
/*
* If we are allowed to merge, then append bio list
* from next to rq and release next. merge_requests_fn