Btrfs: fix btrfs_is_free_space_inode to recognize btree inode

For btree inode, its root is also 'tree root', so btree inode can be
misunderstood as a free space inode.

We should add one more check for btree inode.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 12394a90d60f..b168238bcb13 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -194,8 +194,10 @@ static inline void btrfs_i_size_write(struct inode *inode, u64 size)
 static inline bool btrfs_is_free_space_inode(struct btrfs_root *root,
                                        struct inode *inode)
 {
-        if (root == root->fs_info->tree_root ||
-            BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
+        if (root == root->fs_info->tree_root &&
+            btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
+                return true;
+        if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
                 return true;
         return false;
 }