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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2012-01-11 16:27:11 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-01-11 16:27:11 +0100 |
| commit | b1bd055d397e09f99dcef9b138ed104ff1812fcb (patch) | |
| tree | e8e1d3d0b6a33859392bcba516933aff256dc4b4 /include/linux/blkdev.h | |
| parent | c98b2cc29af8e84e7364b53e9bb4cc7cfaf62555 (diff) | |
| download | op-kernel-dev-b1bd055d397e09f99dcef9b138ed104ff1812fcb.zip op-kernel-dev-b1bd055d397e09f99dcef9b138ed104ff1812fcb.tar.gz | |
block: Introduce blk_set_stacking_limits function
Stacking driver queue limits are typically bounded exclusively by the
capabilities of the low level devices, not by the stacking driver
itself.
This patch introduces blk_set_stacking_limits() which has more liberal
metrics than the default queue limits function. This allows us to
inherit topology parameters from bottom devices without manually
tweaking the default limits in each driver prior to calling the stacking
function.
Since there is now a clear distinction between stacking and low-level
devices, blk_set_default_limits() has been modified to carry the more
conservative values that we used to manually set in
blk_queue_make_request().
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8bca048..adc3413 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -844,6 +844,7 @@ extern void blk_queue_io_min(struct request_queue *q, unsigned int min); extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); extern void blk_set_default_limits(struct queue_limits *lim); +extern void blk_set_stacking_limits(struct queue_limits *lim); extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, sector_t offset); extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
