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Date:   Fri, 22 Jan 2021 18:33:40 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Christian Brauner <christian.brauner@ubuntu.com>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Christoph Hellwig <hch@lst.de>, linux-fsdevel@vger.kernel.org,
        John Johansen <john.johansen@canonical.com>,
        James Morris <jmorris@namei.org>,
        Mimi Zohar <zohar@linux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
        Stephen Smalley <stephen.smalley.work@gmail.com>,
        Casey Schaufler <casey@schaufler-ca.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
        Geoffrey Thomas <geofft@ldpreload.com>,
        Mrunal Patel <mpatel@redhat.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Andy Lutomirski <luto@kernel.org>,
        Theodore Tso <tytso@mit.edu>, Alban Crequy <alban@kinvolk.io>,
        Tycho Andersen <tycho@tycho.ws>,
        David Howells <dhowells@redhat.com>,
        James Bottomley <James.Bottomley@hansenpartnership.com>,
        Seth Forshee <seth.forshee@canonical.com>,
        =?iso-8859-1?Q?St=E9phane?= Graber <stgraber@ubuntu.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Aleksa Sarai <cyphar@cyphar.com>,
        Lennart Poettering <lennart@poettering.net>,
        "Eric W. Biederman" <ebiederm@xmission.com>, smbarber@chromium.org,
        Phil Estes <estesp@gmail.com>, Serge Hallyn <serge@hallyn.com>,
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        Todd Kjos <tkjos@google.com>, Paul Moore <paul@paul-moore.com>,
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        containers@lists.linux-foundation.org,
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        Mauricio =?iso-8859-1?Q?V=E1squez?= Bernal 
        <mauricio@kinvolk.io>
Subject: Re: [PATCH v6 35/40] fs: introduce MOUNT_ATTR_IDMAP
Message-ID: <20210122173340.GA20658@lst.de>
References: <20210121131959.646623-1-christian.brauner@ubuntu.com> <20210121131959.646623-36-christian.brauner@ubuntu.com>
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>  /*
>   * mount_setattr()
> @@ -127,9 +128,10 @@ struct mount_attr {
>  	__u64 attr_set;
>  	__u64 attr_clr;
>  	__u64 propagation;
> +	__u64 userns_fd;
>  };
>  
>  /* List of all mount_attr versions. */
> -#define MOUNT_ATTR_SIZE_VER0	24 /* sizeof first published struct */
> +#define MOUNT_ATTR_SIZE_VER0	32 /* sizeof first published struct */

I think this hunk needs to go into the patch adding the structure.