diff options
| author | TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com> | 2009-11-12 07:14:26 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-13 13:19:59 -0700 |
| commit | 8db426bbfeef206a8cd6002d6790f936f3071f0c (patch) | |
| tree | c7f5db164861752e6f993d0c1ec2c800e11e10cf /fs | |
| parent | f09a3eb5f7c42159bfa53a03779741487b5336a7 (diff) | |
Btrfs: deny sys_link across subvolumes.
commit 4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9 upstream.
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>
Acked-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/inode.c | 4 |
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 |