btrfs: allow idmapped permission inode op

Enable btrfs_permission() to handle idmapped mounts. This is just a
matter of passing down the mount's userns.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 88ac63f..6ef2448 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10403,7 +10403,7 @@ static int btrfs_permission(struct user_namespace *mnt_userns,
                if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
                        return -EACCES;
        }
-       return generic_permission(&init_user_ns, inode, mask);
+       return generic_permission(mnt_userns, inode, mask);
 }
 
 static int btrfs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,