btrfs: sysfs: export supported checksums (f7cea56c) · Commits · 戴 / test

fs/btrfs/ctree.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -53,6 +53,11 @@ const char *btrfs_super_csum_name(u16 csum_type)
		return btrfs_csums[csum_type].name;
		}

		size_t __const btrfs_get_num_csums(void)
		{
		return ARRAY_SIZE(btrfs_csums);
		}

		struct btrfs_path *btrfs_alloc_path(void)
		{
		return kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS);

+2 −0

Original line number	Diff line number	Diff line
		@@ -2163,6 +2163,8 @@ BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,

		int btrfs_super_csum_size(const struct btrfs_super_block *s);
		const char *btrfs_super_csum_name(u16 csum_type);
		size_t __const btrfs_get_num_csums(void);


		/*
		* The leaf data grows from end-to-front in the node.

+22 −0

Original line number	Diff line number	Diff line
		@@ -295,8 +295,30 @@ static ssize_t rmdir_subvol_show(struct kobject *kobj,
		}
		BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);

		static ssize_t supported_checksums_show(struct kobject *kobj,
		struct kobj_attribute a, char buf)
		{
		ssize_t ret = 0;
		int i;

		for (i = 0; i < btrfs_get_num_csums(); i++) {
		/*
		* This "trick" only works as long as 'enum btrfs_csum_type' has
		* no holes in it
		*/
		ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
		(i == 0 ? "" : " "), btrfs_super_csum_name(i));

		}

		ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
		return ret;
		}
		BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);

		static struct attribute *btrfs_supported_static_feature_attrs[] = {
		BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
		BTRFS_ATTR_PTR(static_feature, supported_checksums),
		NULL
		};