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block: Create bip slabs with embedded integrity vectors

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This patch restores stacking ability to the block layer integrity
infrastructure by creating a set of dedicated bip slabs.  Each bip slab
has an embedded bio_vec array at the end.  This cuts down on memory
allocations and also simplifies the code compared to the original bvec
version.  Only the largest bip slab is backed by a mempool.  The pool is
contained in the bio_set so stacking drivers can ensure forward
progress.

Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Jens Axboe <axboe@carl.(none)>
This commit is contained in:
Martin K. Petersen 2009-06-26 15:37:49 +02:00 • committed by Jens Axboe
commit 7878cba9f0
5 changed files with 152 additions and 57 deletions
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2
block/blk-core.c
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@ -2365,7 +2365,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
__bio_clone(bio, bio_src);
if (bio_integrity(bio_src) &&
bio_integrity_clone(bio, bio_src, gfp_mask))
bio_integrity_clone(bio, bio_src, gfp_mask, bs))
goto free_and_out;
if (bio_ctr && bio_ctr(bio, bio_src, data))