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

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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: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan 2011-03-17 15:17:59 +08:00
parent 109b36a2bb
commit 2e6a00356a
1 changed files with 12 additions and 21 deletions
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33
fs/btrfs/xattr.c
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@ -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)
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]++;
}
ret = btrfs_next_leaf(root, path);
if (ret < 0)
goto err;
else if (ret > 0)
break;
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;