Commit 089c8b05 authored by Anand Jain's avatar Anand Jain Committed by David Sterba
Browse files

btrfs: sysfs: export filesystem generation 



Matching with the information that's available from the ioctl
FS_INFO, add generation to the per-filesystem directory
/sys/fs/btrfs/UUID/generation, which could be used by scripts.

Signed-off-by: default avatarAnand Jain <anand.jain@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 0477e928

fs/btrfs/sysfs.c

+10 −0
Original line number Diff line number Diff line
@@ -854,6 +854,15 @@ static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj, 
}

BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);



static ssize_t btrfs_generation_show(struct kobject *kobj,

				     struct kobj_attribute *a, char *buf)

{

	struct btrfs_fs_info *fs_info = to_fs_info(kobj);



	return scnprintf(buf, PAGE_SIZE, "%llu\n", fs_info->generation);

}

BTRFS_ATTR(, generation, btrfs_generation_show);



static const struct attribute *btrfs_attrs[] = {

	BTRFS_ATTR_PTR(, label),

	BTRFS_ATTR_PTR(, nodesize),
@@ -863,6 +872,7 @@ static const struct attribute *btrfs_attrs[] = { 
	BTRFS_ATTR_PTR(, metadata_uuid),

	BTRFS_ATTR_PTR(, checksum),

	BTRFS_ATTR_PTR(, exclusive_operation),

	BTRFS_ATTR_PTR(, generation),

	NULL,

};