btrfs: check link counter overflow in link(2)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Chris Mason <chris.mason@oracle.com>
git-mirror · Mar 28, 2011 · c055e99 · c055e99
1 parent 9298679
commit c055e99
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
@@ -4837,6 +4837,9 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	if (root->objectid != BTRFS_I(inode)->root->objectid)
 		return -EXDEV;
 
+	if (inode->i_nlink == ~0U)
+		return -EMLINK;
+
 	btrfs_inc_nlink(inode);
 	inode->i_ctime = CURRENT_TIME;