linux-kernel - Re: [PATCH v4 5/6] add listmount(2) syscall

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Message-ID: <87o7g4xlmb.fsf@meer.lwn.net>
Date:   Wed, 08 Nov 2023 09:20:28 -0700
From:   Jonathan Corbet <corbet@....net>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-man@...r.kernel.org,
        linux-security-module@...r.kernel.org, Karel Zak <kzak@...hat.com>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Amir Goldstein <amir73il@...il.com>,
        Matthew House <mattlloydhouse@...il.com>,
        Florian Weimer <fweimer@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v4 5/6] add listmount(2) syscall

Christian Brauner <brauner@...nel.org> writes:

>> Why use struct __mount_arg (or struct mnt_id_req :) here rather than
>> just passing in the mount ID directly?  You don't use the request_mask
>
> Please see Arnd's detailed summary here:
> https://lore.kernel.org/lkml/44631c05-6b8a-42dc-b37e-df6776baa5d4@app.fastmail.com

Ah, makes sense, I'd missed that.

Given this, though, it seems like maybe sys_listmount() should enforce
that req->request_mask==0 ?

Thanks,

jon