From f679a84034be6f7da123be786bbd8838bf3e9207 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Thu, 24 Sep 2009 09:17:31 -0400 Subject: [PATCH] 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 Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 19fcde289dd9..01c5f8b5a34e 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;