From: Yan, Zheng Date: Thu, 24 Sep 2009 13:17:31 +0000 (-0400) Subject: Btrfs: don't rename file into dummy directory X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f679a84034be6f7da123be786bbd8838bf3e9207;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git 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 --- 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;