docs: document idmapped overlay mounts

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Describe that the merged overlay mount itself can be turned into an
idmapped mount with mount_setattr(2), how the overlay mount idmapping
composes with any layer idmappings, and that the mounter's access to
the underlying layers is unaffected.

Link: https://patch.msgid.link/20260615-work-idmapped-overlayfs-v1-7-7381632aa402@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-06-15 15:19:56 +02:00

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Documentation/filesystems/overlayfs.rst

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