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authorChristoph Hellwig <hch@lst.de>2010-06-18 16:59:42 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 18:23:08 +0200
commit66ac0280197981f88774e74b60c8e5f9f07c1dba (patch)
treed093ce493146779926df88b5831805c6f9ee14e1 /include/linux/blkdev.h
parent082439004b31adc146e96e5f1c574dd2b57dcd93 (diff)
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/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h2
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,