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authorYan, Zheng <zheng.yan@oracle.com>2009-09-24 09:17:31 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-24 09:17:31 -0400
commitf679a84034be6f7da123be786bbd8838bf3e9207 (patch)
tree4dce1760675978fd0b113e04f9608f57161bac85
parenta57195214358b75807a74bad96a8601a36262af7 (diff)
Btrfs: don't rename file into dummy directory
A recent change enforces only one access point to each subvolume. The first directory entry (the one added when the subvolume/snapshot was created) is treated as valid access point, all other subvolume links are linked to dummy empty directories. The dummy directories are temporary inodes that only in memory, so we can not rename file into them. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/inode.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 19fcde289dd..01c5f8b5a34 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5055,6 +5055,9 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
u64 root_objectid;
int ret;
+ if (new_dir->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
+ return -EPERM;
+
/* we only allow rename subvolume link between subvolumes */
if (old_inode->i_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest)
return -EXDEV;