linux-kernel - Re: [PATCH v9 1/4] vfs, fdtable: Add fget

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Date:   Mon, 13 Jan 2020 16:02:31 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Sargun Dhillon <sargun@...gun.me>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Tycho Andersen <tycho@...ho.ws>, Jann Horn <jannh@...gle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        Gian-Carlo Pascutto <gpascutto@...illa.com>,
        Emilio Cobos Álvarez <ealvarez@...illa.com>,
        Florian Weimer <fweimer@...hat.com>,
        Jed Davis <jld@...illa.com>
Subject: Re: [PATCH v9 1/4] vfs, fdtable: Add fget_task helper

On Tue, Jan 7, 2020 at 6:59 PM Sargun Dhillon <sargun@...gun.me> wrote:
>
> This introduces a function which can be used to fetch a file, given an
> arbitrary task. As long as the user holds a reference (refcnt) to the
> task_struct it is safe to call, and will either return NULL on failure,
> or a pointer to the file, with a refcnt.
>
> This patch is based on Oleg Nesterov's (cf. [1]) patch from September
> 2018.
>
> [1]: Link: https://lore.kernel.org/r/20180915160423.GA31461@redhat.com
>
> Signed-off-by: Sargun Dhillon <sargun@...gun.me>
> Suggested-by: Oleg Nesterov <oleg@...hat.com>
> Acked-by: Christian Brauner <christian.brauner@...ntu.com>

Reviewed-by: Arnd Bergmann <arnd@...db.de>