From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5DB2C33CAE for ; Mon, 13 Jan 2020 15:02:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 96C7D2084D for ; Mon, 13 Jan 2020 15:02:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729048AbgAMPCv (ORCPT ); Mon, 13 Jan 2020 10:02:51 -0500 Received: from mout.kundenserver.de ([217.72.192.75]:50661 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726567AbgAMPCv (ORCPT ); Mon, 13 Jan 2020 10:02:51 -0500 Received: from mail-qt1-f182.google.com ([209.85.160.182]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.145]) with ESMTPSA (Nemesis) id 1M7sM0-1inBU31ZIo-0051YL; Mon, 13 Jan 2020 16:02:49 +0100 Received: by mail-qt1-f182.google.com with SMTP id d18so9307850qtj.10; Mon, 13 Jan 2020 07:02:49 -0800 (PST) X-Gm-Message-State: APjAAAWOGvDVfcGRfdFNDLMAfh646YVfQAVLtj/2GGcYkDqCNKcQi4lz hl1jf7gBxX9E6MT0jr8L23hzskrldX6YmgkbtXU= X-Google-Smtp-Source: APXvYqxsoEYmTq+RE4xAl65+mhorh2I9NE7KRvTRmwGYPXc6DTXOraF2Y1j53/xbkqS1OmdA70RBWtQ5A13Lqfh9Scc= X-Received: by 2002:ac8:47d3:: with SMTP id d19mr14102091qtr.142.1578927768175; Mon, 13 Jan 2020 07:02:48 -0800 (PST) MIME-Version: 1.0 References: <20200107175927.4558-1-sargun@sargun.me> <20200107175927.4558-2-sargun@sargun.me> In-Reply-To: <20200107175927.4558-2-sargun@sargun.me> From: Arnd Bergmann Date: Mon, 13 Jan 2020 16:02:31 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v9 1/4] vfs, fdtable: Add fget_task helper To: Sargun Dhillon Cc: "linux-kernel@vger.kernel.org" , Linux Containers , Linux API , Linux FS-devel Mailing List , Tycho Andersen , Jann Horn , Aleksa Sarai , Christian Brauner , Oleg Nesterov , Andy Lutomirski , Al Viro , Gian-Carlo Pascutto , =?UTF-8?Q?Emilio_Cobos_=C3=81lvarez?= , Florian Weimer , Jed Davis Content-Type: text/plain; charset="UTF-8" X-Provags-ID: V03:K1:EazS39lBXe7l2MXTjvoN3t5fQWhLNgan09i4rpbG1Ror2bq23ZP gaK4s9swynMmEhrzadP23qax9Ft4zh4tRox6X3DXu2sB4W7wYUEcUURcDK8FCSlhm70Hp2M 3Hi5wndJwn9IO3b2a0H5/yL/6LCCbrbdi74YxzI/CiBydYGlklxAeuqtJi8iw9v1fLWxwtK L7bkNbOgof36eZzGjegsA== X-UI-Out-Filterresults: notjunk:1;V03:K0:DzF3lkCw0C0=:T6j1HF4d6Cj5rxi0G7MhBt s6EZ3WerxgZCSYsy2blIJJpGCLjBKypdL9Cl48ryGAUYCXYw+3b85YR/YCNlhQcbqAP8U8fq7 0KTtSpy4FPf5sdwVRZ6GbitVJwuWlugU7E0Haw3lcfZVU+Vxd9E63ktH8eslFL2dGV73MFANe zB1SPq8K7a3/aVFZH2VoB/cmjQKiFRvmlp1Jn8BU9JtKR8j8Z/lBABsnkUSufvmOnPQi5Dn4+ CU9Smt1rT8+RU9TV8D0qVO23POvvETdkqeWn+IE6Wh78fgq65PnyEzi1TntV7SjIiGa24QtLf LJsAHg4ybvzs5wOoYLdyNJGWavtHDvstxhquSirN+8qBofKkdd74tWXK/EQvBpfREmmlpmt0A +dTVwvMU8tc5bihkYim3JKxTCB5yAGUPLdtxtmPjSby9YXDrH9zjhOg4wubTmqYFLt4MlCeBT /tKChaKgzAxGG0jqRNTWXj88MPyY18uAvFcNE8tW5UDIqxXG5dv6cwcwpJIApSzrpZGFSbJr2 jahz1MTrCzfm6milvi2Y2wKFuMX+wd2cML5cR9BLn+rbNbDwuwPgOa2MV77gP/uEtxGVbW6BC Ig45p94v/PJKA5kYLyprtVzqCqJZxVxKJsFEcSMnKWtN0nuMPJzffS3HgFLA7XEmpXN+Wo71W 85z8JrBKCBG1O+Dt17yC6TFQnENPsIDYn7Oi9R6HmiMAPrw20eKqT16o5O1da8ZtIP8dZweht xpZx0zSPUq7mdL3wlW5JOeYu9VZg0ZvZfL6q9XEtaPKoWNp6bgYtxwEMl/O/g1omCSzTJ89My XNOWVTl0X/ysBZpfc2zrl2AiNKvqnyia3oIkveNiHXFTHjr2Z92n3Mpv9dl+uEOfgnVsBanP8 KlaV45aPLTFupKctzkiw== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 7, 2020 at 6:59 PM Sargun Dhillon 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 > Suggested-by: Oleg Nesterov > Acked-by: Christian Brauner Reviewed-by: Arnd Bergmann