From 8ad6fcab564c5bc956bdc3dfa440ab152b6e780f Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 18 Mar 2010 12:23:10 -0400 Subject: Btrfs: fix the inode ref searches done by btrfs_search_path_in_tree This is used by the inode lookup ioctl to follow all the backrefs up to the subvol root. But the search being done would sometimes land one past the last item in the leaf instead of finding the backref. This changes the search to look for the highest possible backref and hop back one item. It also fixes a leaked path on failure to find the root. Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 1e462de6556e..2845c6ceecd2 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1147,12 +1147,13 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, root = btrfs_read_fs_root_no_name(info, &key); if (IS_ERR(root)) { printk(KERN_ERR "could not find root %llu\n", tree_id); - return -ENOENT; + ret = -ENOENT; + goto out; } key.objectid = dirid; key.type = BTRFS_INODE_REF_KEY; - key.offset = 0; + key.offset = (u64)-1; while(1) { ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); @@ -1161,6 +1162,8 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, l = path->nodes[0]; slot = path->slots[0]; + if (ret > 0 && slot > 0) + slot--; btrfs_item_key_to_cpu(l, &key, slot); if (ret > 0 && (key.objectid != dirid || @@ -1184,7 +1187,7 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, btrfs_release_path(root, path); key.objectid = key.offset; - key.offset = 0; + key.offset = (u64)-1; dirid = key.objectid; } -- cgit v1.2.3-55-g7522