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authorMartin K. Petersen <martin.petersen@oracle.com>2009-07-31 11:49:11 -0400
committerJens Axboe <jens.axboe@oracle.com>2009-08-01 04:24:35 -0400
commit7c958e32649e0c35801762878fb0b6da8c55a515 (patch)
tree610b1e685b5f634ca591865cc9f5ce22f1e3e6c1 /block/blk-settings.c
parentfef246672b009cf3f7a74e2fc9a76932ef2eeed2 (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>
Diffstat (limited to 'block/blk-settings.c')
-rw-r--r--block/blk-settings.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 8e86e2d2b147..1f7197434166 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)
384EXPORT_SYMBOL(blk_queue_alignment_offset); 384EXPORT_SYMBOL(blk_queue_alignment_offset);
385 385
386/** 386/**
387 * blk_limits_io_min - set minimum request size for a device
388 * @limits: the queue limits
389 * @min: smallest I/O size in bytes
390 *
391 * Description:
392 * Some devices have an internal block size bigger than the reported
393 * hardware sector size. This function can be used to signal the
394 * smallest I/O the device can perform without incurring a performance
395 * penalty.
396 */
397void blk_limits_io_min(struct queue_limits *limits, unsigned int min)
398{
399 limits->io_min = min;
400
401 if (limits->io_min < limits->logical_block_size)
402 limits->io_min = limits->logical_block_size;
403
404 if (limits->io_min < limits->physical_block_size)
405 limits->io_min = limits->physical_block_size;
406}
407EXPORT_SYMBOL(blk_limits_io_min);
408
409/**
387 * blk_queue_io_min - set minimum request size for the queue 410 * blk_queue_io_min - set minimum request size for the queue
388 * @q: the request queue for the device 411 * @q: the request queue for the device
389 * @min: smallest I/O size in bytes 412 * @min: smallest I/O size in bytes
@@ -396,13 +419,7 @@ EXPORT_SYMBOL(blk_queue_alignment_offset);
396 */ 419 */
397void blk_queue_io_min(struct request_queue *q, unsigned int min) 420void blk_queue_io_min(struct request_queue *q, unsigned int min)
398{ 421{
399 q->limits.io_min = min; 422 blk_limits_io_min(&q->limits, min);
400
401 if (q->limits.io_min < q->limits.logical_block_size)
402 q->limits.io_min = q->limits.logical_block_size;
403
404 if (q->limits.io_min < q->limits.physical_block_size)
405 q->limits.io_min = q->limits.physical_block_size;
406} 423}
407EXPORT_SYMBOL(blk_queue_io_min); 424EXPORT_SYMBOL(blk_queue_io_min);
408 425