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Replace the mountd upcall #54

Open chucklever opened 5 months ago

chucklever commented 5 months ago

The kernel uses an upcall to request mountd to resolve pathnames into exports, file handles, or junctions. The current upcall mechanism is text-based and somewhat difficult to extend. It also has a limit of one page per request, so a response that includes a significant amount of data (for example, a large fs_locations list) is not possible.

One thought is to replace the current mechanism with a netlink protocol that is purpose-built for handling kernel pathname resolution.

chucklever commented 5 months ago

Confirm that in nfsv4-only mode, mountd does not run any network listeners.