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Date:   Tue, 13 Jul 2021 13:34:45 +0000
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Christian Brauner <brauner@kernel.org>
Cc:     Christoph Hellwig <hch@lst.de>, Chris Mason <clm@fb.com>,
        Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org,
        linux-fsdevel@vger.kernel.org,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 02/24] namei: handle mappings in lookup_one_len_unlocked()
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References: <20210713111344.1149376-1-brauner@kernel.org>
 <20210713111344.1149376-3-brauner@kernel.org>
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On Tue, Jul 13, 2021 at 01:13:22PM +0200, Christian Brauner wrote:
> From: Christian Brauner <christian.brauner@ubuntu.com>
> 
> Various filesystems use the lookup_one_len_unlocked() helper to lookup a single
> path component relative to a well-known starting point. Allow such filesystems
> to support idmapped mounts by enabling lookup_one_len_unlocked() to take the
> idmap into account when calling inode_permission().

Ditto.  The same applies to the rest of primitives you modify - if you need
a new variant, *add* *that* *variant*.