How to support directory opacity in a filesystem for overlayfs to use?

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Subject: How to support directory opacity in a filesystem for overlayfs to use?
From: David Howells <dhowells@xxxxxxxxxx>
Date: Tue, 14 Jan 2025 15:15:14 +0000
Cc: dhowells@xxxxxxxxxx, linux-unionfs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903

Hi Miklós,

What's the best way for a network filesystem to make a native
directory-is-opaque flag available to the system?  Is it best to catch
setxattr/getxattr/removexattr("overlay.opaque") and translate these into the
RPCs to wrangle the flag?

Thanks,
David

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