Re: [PATCH 5/5] file: Modify struct fown_struct to contain a tref

[Suleiman Souhlal <ssouhlal@FreeBSD.org>]

Eric W. Biederman wrote:

> @@ -317,7 +326,9 @@ static long do_fcntl(int fd, unsigned in
>  		 * current syscall conventions, the only way
>  		 * to fix this will be in libc.
>  		 */
> -		err = filp->f_owner.pid;
> +		err = 0;
> +		if (filp->f_owner.tref->task)
> +			err = filp->f_owner.pid;

Probably not very important, but why don't you use 
filp->f_owner.tref->task->pid? This way you could completely get rid of 
the pid field in fown_struct.

> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -855,7 +855,10 @@ static long sock_ioctl(struct file *file
>  			break;
>  		case FIOGETOWN:
>  		case SIOCGPGRP:
> -			err = put_user(sock->file->f_owner.pid, (int __user *)argp);
> +			pid = 0;
> +			if (sock->file->f_owner.tref->task)
> +				pid = sock->file->f_owner.pid;
> +			err = put_user(pid, (int __user *)argp);

Same here.

-- Suleiman