linux-kernel - Re: [PATCH v2 01/13] fs: export mnt_idmap_get/mnt_idmap

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Date:   Fri, 2 Jun 2023 14:40:27 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Cc:     xiubli@...hat.com, stgraber@...ntu.com,
        linux-fsdevel@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Seth Forshee <sforshee@...nel.org>, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/13] fs: export mnt_idmap_get/mnt_idmap_put

On Wed, May 24, 2023 at 05:33:03PM +0200, Alexander Mikhalitsyn wrote:
> These helpers are required to support idmapped mounts in the Cephfs.
> 
> Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
> ---

It's fine by me to export them. The explicit contract is that _nothing
and absolutely nothing_ outside of core VFS code can directly peak into
struct mnt_idmap internals. That's the only invariant we care about.o 

Reviewed-by: Christian Brauner <brauner@...nel.org>