Re: [PATCH 5.15.y 2/2] exportfs: support idmapped mounts

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jun 07, 2022 at 12:08:39PM +0200, Christian Brauner wrote:
> Make the two locations where exportfs helpers check permission to lookup
> a given inode idmapped mount aware by switching it to the lookup_one()
> helper. This is a bugfix for the open_by_handle_at() system call which
> doesn't take idmapped mounts into account currently. It's not tied to a
> specific commit so we'll just Cc stable.
> 
> In addition this is required to support idmapped base layers in overlay.
> The overlay filesystem uses exportfs to encode and decode file handles
> for its index=on mount option and when nfs_export=on.
> 
> Cc: <stable@vger.kernel.org>
> Cc: <linux-fsdevel@vger.kernel.org>
> Tested-by: Giuseppe Scrivano <gscrivan@redhat.com>
> Reviewed-by: Amir Goldstein <amir73il@gmail.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
> ---
> Hey Greg,
> 
> This was missing a preliminary commit.
> My build machines are currently down so I couldn't do a test build but
> this should build cleanly.

Looks like it applies cleanly, let me apply it and run it through my
build systems...

thanks,

greg k-h