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Commit 87caf97c authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Jens Axboe
Browse files

blk-sysfs: Add 'chunk_sectors' to sysfs attributes 



The queue limits already have a 'chunk_sectors' setting, so
we should be presenting it via sysfs.

Signed-off-by: default avatarHannes Reinecke <hare@suse.de>

[Damien: Updated Documentation/ABI/testing/sysfs-block]

Signed-off-by: default avatarDamien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarShaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: default avatarShaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 797476b8

Documentation/ABI/testing/sysfs-block

+13 −0
Original line number Diff line number Diff line
@@ -251,3 +251,16 @@ Description: 
		since drive-managed zoned block devices do not support

		zone commands, they will be treated as regular block

		devices and zoned will report "none".



What:		/sys/block/<disk>/queue/chunk_sectors

Date:		September 2016

Contact:	Hannes Reinecke <hare@suse.com>

Description:

		chunk_sectors has different meaning depending on the type

		of the disk. For a RAID device (dm-raid), chunk_sectors

		indicates the size in 512B sectors of the RAID volume

		stripe segment. For a zoned block device, either

		host-aware or host-managed, chunk_sectors indicates the

		size of 512B sectors of the zones of the device, with

		the eventual exception of the last zone of the device

		which may be smaller.

block/blk-sysfs.c

+11 −0
Original line number Diff line number Diff line
@@ -130,6 +130,11 @@ static ssize_t queue_physical_block_size_show(struct request_queue *q, char *pag 
	return queue_var_show(queue_physical_block_size(q), page);

}



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

{

	return queue_var_show(q->limits.chunk_sectors, page);

}



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

{

	return queue_var_show(queue_io_min(q), page);
@@ -455,6 +460,11 @@ static struct queue_sysfs_entry queue_physical_block_size_entry = { 
	.show = queue_physical_block_size_show,

};



static struct queue_sysfs_entry queue_chunk_sectors_entry = {

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

	.show = queue_chunk_sectors_show,

};



static struct queue_sysfs_entry queue_io_min_entry = {

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

	.show = queue_io_min_show,
@@ -555,6 +565,7 @@ static struct attribute *default_attrs[] = { 
	&queue_hw_sector_size_entry.attr,

	&queue_logical_block_size_entry.attr,

	&queue_physical_block_size_entry.attr,

	&queue_chunk_sectors_entry.attr,

	&queue_io_min_entry.attr,

	&queue_io_opt_entry.attr,

	&queue_discard_granularity_entry.attr,