Commit 62c89988 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Carlos Maiolino
Browse files

xfs: expose the number of open zones in sysfs 



Add a sysfs attribute for the current number of open zones so that it
can be trivially read from userspace in monitoring or testing software.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: default avatarDamien Le Moal <dlemoal@kernel.org>
Signed-off-by: default avatarCarlos Maiolino <cem@kernel.org>
parent 1d0d9e94

Documentation/admin-guide/xfs.rst

+4 −0
Original line number Diff line number Diff line
@@ -550,6 +550,10 @@ For zoned file systems, the following attributes are exposed in: 
	is limited by the capabilities of the backing zoned device, file system

	size and the max_open_zones mount option.



  nr_open_zones			(Min:  0  Default:  Varies  Max:  UINTMAX)

	This read-only attribute exposes the current number of open zones

	used by the file system.



  zonegc_low_space		(Min:  0  Default:  0  Max:  100)

	Define a percentage for how much of the unused space that GC should keep

	available for writing. A high value will reclaim more of the space

fs/xfs/xfs_sysfs.c

+13 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include "xfs_log.h"

#include "xfs_log_priv.h"

#include "xfs_mount.h"

#include "xfs_zone_priv.h"

#include "xfs_zones.h"

#include "xfs_zone_alloc.h"
@@ -719,6 +720,17 @@ max_open_zones_show( 
}

XFS_SYSFS_ATTR_RO(max_open_zones);



static ssize_t

nr_open_zones_show(

	struct kobject		*kobj,

	char			*buf)

{

	struct xfs_zone_info	*zi = zoned_to_mp(kobj)->m_zone_info;



	return sysfs_emit(buf, "%u\n", READ_ONCE(zi->zi_nr_open_zones));

}

XFS_SYSFS_ATTR_RO(nr_open_zones);



static ssize_t

zonegc_low_space_store(

	struct kobject		*kobj,
@@ -756,6 +768,7 @@ XFS_SYSFS_ATTR_RW(zonegc_low_space); 


static struct attribute *xfs_zoned_attrs[] = {

	ATTR_LIST(max_open_zones),

	ATTR_LIST(nr_open_zones),

	ATTR_LIST(zonegc_low_space),

	NULL,

};