btrfs: Add sysfs support for metadata_uuid feature (56f20f40) · Commits · 戴 / test

fs/btrfs/sysfs.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -191,6 +191,7 @@ BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
		BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
		BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
		BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
		BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
		BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);

		static struct attribute *btrfs_supported_feature_attrs[] = {
		@@ -204,6 +205,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
		BTRFS_FEAT_ATTR_PTR(raid56),
		BTRFS_FEAT_ATTR_PTR(skinny_metadata),
		BTRFS_FEAT_ATTR_PTR(no_holes),
		BTRFS_FEAT_ATTR_PTR(metadata_uuid),
		BTRFS_FEAT_ATTR_PTR(free_space_tree),
		NULL
		};
		@@ -505,12 +507,24 @@ static ssize_t quota_override_store(struct kobject *kobj,

		BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);

		static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
		struct kobj_attribute a, char buf)
		{
		struct btrfs_fs_info *fs_info = to_fs_info(kobj);

		return snprintf(buf, PAGE_SIZE, "%pU\n",
		fs_info->fs_devices->metadata_uuid);
		}

		BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);

		static const struct attribute *btrfs_attrs[] = {
		BTRFS_ATTR_PTR(, label),
		BTRFS_ATTR_PTR(, nodesize),
		BTRFS_ATTR_PTR(, sectorsize),
		BTRFS_ATTR_PTR(, clone_alignment),
		BTRFS_ATTR_PTR(, quota_override),
		BTRFS_ATTR_PTR(, metadata_uuid),
		NULL,
		};