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| author | Christoph Hellwig <hch@lst.de> | 2010-06-18 16:59:42 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 18:23:08 +0200 |
| commit | 66ac0280197981f88774e74b60c8e5f9f07c1dba (patch) | |
| tree | d093ce493146779926df88b5831805c6f9ee14e1 /include | |
| parent | 082439004b31adc146e96e5f1c574dd2b57dcd93 (diff) | |
| download | linux-3.10-66ac0280197981f88774e74b60c8e5f9f07c1dba.tar.gz linux-3.10-66ac0280197981f88774e74b60c8e5f9f07c1dba.tar.bz2 linux-3.10-66ac0280197981f88774e74b60c8e5f9f07c1dba.zip | |
block: don't allocate a payload for discard request
Allocating a fixed payload for discard requests always was a horrible hack,
and it's not coming to byte us when adding support for discard in DM/MD.
So change the code to leave the allocation of a payload to the lowlevel
driver. Unfortunately that means we'll need another hack, which allows
us to update the various block layer length fields indicating that we
have a payload. Instead of hiding this in sd.c, which we already partially
do for UNMAP support add a documented helper in the core block layer for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 3fc0f590861..204fbe22354 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -705,6 +705,8 @@ extern struct request *blk_make_request(struct request_queue *, struct bio *, gfp_t); extern void blk_insert_request(struct request_queue *, struct request *, int, void *); extern void blk_requeue_request(struct request_queue *, struct request *); +extern void blk_add_request_payload(struct request *rq, struct page *page, + unsigned int len); extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); extern int blk_lld_busy(struct request_queue *q); extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |