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Commit c77a5710 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

block: Export max number of segments and max segment size in sysfs 



These two values are useful when debugging issues surrounding maximum
I/O size.  Put them in sysfs with the rest of the queue limits.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent ee714f2d

block/blk-sysfs.c

+25 −0
Original line number Diff line number Diff line
@@ -106,6 +106,19 @@ static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) 
	return queue_var_show(max_sectors_kb, (page));

}



static ssize_t queue_max_segments_show(struct request_queue *q, char *page)

{

	return queue_var_show(queue_max_segments(q), (page));

}



static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)

{

	if (test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))

		return queue_var_show(queue_max_segment_size(q), (page));



	return queue_var_show(PAGE_CACHE_SIZE, (page));

}



static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)

{

	return queue_var_show(queue_logical_block_size(q), page);
@@ -280,6 +293,16 @@ static struct queue_sysfs_entry queue_max_hw_sectors_entry = { 
	.show = queue_max_hw_sectors_show,

};



static struct queue_sysfs_entry queue_max_segments_entry = {

	.attr = {.name = "max_segments", .mode = S_IRUGO },

	.show = queue_max_segments_show,

};



static struct queue_sysfs_entry queue_max_segment_size_entry = {

	.attr = {.name = "max_segment_size", .mode = S_IRUGO },

	.show = queue_max_segment_size_show,

};



static struct queue_sysfs_entry queue_iosched_entry = {

	.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },

	.show = elv_iosched_show,
@@ -355,6 +378,8 @@ static struct attribute *default_attrs[] = { 
	&queue_ra_entry.attr,

	&queue_max_hw_sectors_entry.attr,

	&queue_max_sectors_entry.attr,

	&queue_max_segments_entry.attr,

	&queue_max_segment_size_entry.attr,

	&queue_iosched_entry.attr,

	&queue_hw_sector_size_entry.attr,

	&queue_logical_block_size_entry.attr,