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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>
This commit is contained in:
TARUISI Hiroaki 2009-11-12 07:14:26 +00:00 committed by Chris Mason
parent a7a3f7cadd
commit 4a8be425a8
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/inode.c
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@ -4462,6 +4462,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
if (inode->i_nlink == 0) if (inode->i_nlink == 0)
return -ENOENT; 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 * 1 item for inode ref
* 2 items for dir items * 2 items for dir items