Re: [PATCH v2 02/19] exportfs: support idmapped mounts

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On Wed, Mar 30, 2022 at 12:23:50PM +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.

This probably wants a Fixes tag, as without it NFS exporting idmapped
file will give slightly unexpected results.

Otherwise looks fine:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>



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