Commit 7573df55 authored by Omar Sandoval's avatar Omar Sandoval Committed by David Sterba
Browse files

btrfs: sysfs: export supported send stream version 



This reports the latest send stream version supported by the kernel as
the feature in /sys/fs/btrfs/features/send_stream_version .

Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent c9a949af

fs/btrfs/sysfs.c

+9 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include "ctree.h"

#include "discard.h"

#include "disk-io.h"

#include "send.h"

#include "transaction.h"

#include "sysfs.h"

#include "volumes.h"
@@ -321,9 +322,17 @@ static ssize_t supported_checksums_show(struct kobject *kobj, 
}

BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);



static ssize_t send_stream_version_show(struct kobject *kobj,

					struct kobj_attribute *ka, char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%d\n", BTRFS_SEND_STREAM_VERSION);

}

BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);



static struct attribute *btrfs_supported_static_feature_attrs[] = {

	BTRFS_ATTR_PTR(static_feature, rmdir_subvol),

	BTRFS_ATTR_PTR(static_feature, supported_checksums),

	BTRFS_ATTR_PTR(static_feature, send_stream_version),

	NULL

};