linux-kernel - Re: [PATCH] proc: proc_inode pid/fd and sysctl/sysctl

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Date:	Wed, 12 Jan 2011 12:29:54 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Vlad Dogaru <ddvlad@...edu.org>,
	Octavian Purdila <opurdila@...acom.com>
Subject: Re: [PATCH] proc: proc_inode pid/fd and sysctl/sysctl_entry are never
 used at the same time

On Wed, Jan 12, 2011 at 12:14 PM, Lucian Adrian Grijincu
<lucian.grijincu@...il.com> wrote:
> Or at least I could not find a place where both are
> used at the same time.

See proc_evict_inode().

>  struct proc_inode {
> -       struct pid *pid;
> -       int fd;
> -       union proc_op op;
> +       union {
> +               struct {
> +                       int fd;
> +                       struct pid *pid;
> +               };
> +               struct {
> +                       struct ctl_table_header *sysctl;
> +                       struct ctl_table *sysctl_entry;
> +               };
> +       };
>         struct proc_dir_entry *pde;
> -       struct ctl_table_header *sysctl;
> -       struct ctl_table *sysctl_entry;
> +       union proc_op op;
>         struct inode vfs_inode;
>  };
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