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Commit 2e6a0035 authored by Li Zefan's avatar Li Zefan
Browse files

Btrfs: Check if btrfs_next_leaf() returns error in btrfs_listxattr() 



btrfs_next_leaf() can return -errno, and we should propagate
it to userspace.

This also simplifies how we walk the btree path.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
parent 109b36a2

fs/btrfs/xattr.c

+12 −21
Original line number Diff line number Diff line
@@ -180,11 +180,10 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 
	struct btrfs_path *path;

	struct extent_buffer *leaf;

	struct btrfs_dir_item *di;

	int ret = 0, slot, advance;

	int ret = 0, slot;

	size_t total_size = 0, size_left = size;

	unsigned long name_ptr;

	size_t name_len;

	u32 nritems;



	/*

	 * ok we want all objects associated with this id.
@@ -204,34 +203,24 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 
	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);

	if (ret < 0)

		goto err;

	advance = 0;



	while (1) {

		leaf = path->nodes[0];

		nritems = btrfs_header_nritems(leaf);

		slot = path->slots[0];



		/* this is where we start walking through the path */

		if (advance || slot >= nritems) {

		if (slot >= btrfs_header_nritems(leaf)) {

			/*

			 * if we've reached the last slot in this leaf we need

			 * to go to the next leaf and reset everything

			 */

			if (slot >= nritems-1) {

			ret = btrfs_next_leaf(root, path);

				if (ret)

			if (ret < 0)

				goto err;

			else if (ret > 0)

				break;

				leaf = path->nodes[0];

				nritems = btrfs_header_nritems(leaf);

				slot = path->slots[0];

			} else {

				/*

				 * just walking through the slots on this leaf

				 */

				slot++;

				path->slots[0]++;

			}

			continue;

		}

		advance = 1;



		btrfs_item_key_to_cpu(leaf, &found_key, slot);
@@ -250,7 +239,7 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 


		/* we are just looking for how big our buffer needs to be */

		if (!size)

			continue;

			goto next;



		if (!buffer || (name_len + 1) > size_left) {

			ret = -ERANGE;
@@ -263,6 +252,8 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size) 


		size_left -= name_len + 1;

		buffer += name_len + 1;

next:

		path->slots[0]++;

	}

	ret = total_size;