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authorTARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>2009-11-12 07:14:26 +0000
committerChris Mason <chris.mason@oracle.com>2009-12-17 12:33:37 -0500
commit4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9 (patch)
treec89e0aa1aac790d77f6a29a4bc48384922152d00
parenta7a3f7cadd9bdee569243f7ead9550aa16b60e07 (diff)
downloadlinux-sh-4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9.tar.gz
Btrfs: deny sys_link across subvolumes.
I rebased Christian Parpart's patch to deny hard link across subvolumes. Original patch modifies also btrfs_rename, but I excluded it because we can move across subvolumes now and it make no problem. ----------------- Hard link across subvolumes should not allowed in Btrfs. btrfs_link checks root of 'to' directory is same as root of 'from' file. If not same, btrfs_link returns -EPERM. Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/inode.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 168e8c040aab..da76cad92ecf 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4462,6 +4462,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
if (inode->i_nlink == 0)
return -ENOENT;
+ /* do not allow sys_link's with other subvols of the same device */
+ if (root->objectid != BTRFS_I(inode)->root->objectid)
+ return -EPERM;
+
/*
* 1 item for inode ref
* 2 items for dir items