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Commit 7c958e32 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

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: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent fef24667

block/blk-settings.c

+24 −7
Original line number Diff line number Diff line
@@ -383,6 +383,29 @@ 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
@@ -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);

include/linux/blkdev.h

+1 −0
Original line number Diff line number Diff line
@@ -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);