diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2009-07-31 11:49:11 -0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-08-01 10:24:35 +0200 |
| commit | 7c958e32649e0c35801762878fb0b6da8c55a515 (patch) | |
| tree | 610b1e685b5f634ca591865cc9f5ce22f1e3e6c1 | |
| parent | fef246672b009cf3f7a74e2fc9a76932ef2eeed2 (diff) | |
block: Add a wrapper for setting minimum request size without a queue
Introduce blk_limits_io_min() and make blk_queue_io_min() call it.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/blk-settings.c | 31 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 |
2 files changed, 25 insertions, 7 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 8e86e2d2b14..1f719743416 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -384,6 +384,29 @@ void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) EXPORT_SYMBOL(blk_queue_alignment_offset); /** + * blk_limits_io_min - set minimum request size for a device + * @limits: the queue limits + * @min: smallest I/O size in bytes + * + * Description: + * Some devices have an internal block size bigger than the reported + * hardware sector size. This function can be used to signal the + * smallest I/O the device can perform without incurring a performance + * penalty. + */ +void blk_limits_io_min(struct queue_limits *limits, unsigned int min) +{ + limits->io_min = min; + + if (limits->io_min < limits->logical_block_size) + limits->io_min = limits->logical_block_size; + + if (limits->io_min < limits->physical_block_size) + limits->io_min = limits->physical_block_size; +} +EXPORT_SYMBOL(blk_limits_io_min); + +/** * blk_queue_io_min - set minimum request size for the queue * @q: the request queue for the device * @min: smallest I/O size in bytes @@ -396,13 +419,7 @@ EXPORT_SYMBOL(blk_queue_alignment_offset); */ void blk_queue_io_min(struct request_queue *q, unsigned int min) { - q->limits.io_min = min; - - if (q->limits.io_min < q->limits.logical_block_size) - q->limits.io_min = q->limits.logical_block_size; - - if (q->limits.io_min < q->limits.physical_block_size) - q->limits.io_min = q->limits.physical_block_size; + blk_limits_io_min(&q->limits, min); } EXPORT_SYMBOL(blk_queue_io_min); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index e7cb5dbf6c2..69103e053c9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -913,6 +913,7 @@ extern void blk_queue_logical_block_size(struct request_queue *, unsigned short) extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); extern void blk_queue_alignment_offset(struct request_queue *q, unsigned int alignment); +extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); extern void blk_queue_io_min(struct request_queue *q, unsigned int min); extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); extern void blk_set_default_limits(struct queue_limits *lim); |