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authorMike Snitzer <snitzer@redhat.com>2010-12-17 08:34:20 +0100
committerJens Axboe <jaxboe@fusionio.com>2010-12-17 08:36:01 +0100
commit72d4cd9f38b5ed96b75df4c622be25e1c2648dd3 (patch)
treea229645cbbc63aad3fa5b57ea9f092e618588890 /include/linux/blkdev.h
parente692cb668fdd5a712c6ed2a2d6f2a36ee83997b4 (diff)
block: max hardware sectors limit wrapper
Implement blk_limits_max_hw_sectors() and make blk_queue_max_hw_sectors() a wrapper around it. DM needs this to avoid setting queue_limits' max_hw_sectors and max_sectors directly. dm_set_device_limits() now leverages blk_limits_max_hw_sectors() logic to establish the appropriate max_hw_sectors minimum (PAGE_SIZE). Fixes issue where DM was incorrectly setting max_sectors rather than max_hw_sectors (which caused dm_merge_bvec()'s max_hw_sectors check to be ineffective). Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@kernel.org Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 95aeeeb49e8..36ab42c9bb9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -808,6 +808,7 @@ extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
extern void blk_cleanup_queue(struct request_queue *);
extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
extern void blk_queue_bounce_limit(struct request_queue *, u64);
+extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int);
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);