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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 /fs/btrfs/inode.c
parenta57195214358b75807a74bad96a8601a36262af7 (diff)
downloadop-kernel-dev-f679a84034be6f7da123be786bbd8838bf3e9207.zip
op-kernel-dev-f679a84034be6f7da123be786bbd8838bf3e9207.tar.gz
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>
Diffstat (limited to 'fs/btrfs/inode.c')
-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 19fcde2..01c5f8b 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;
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