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[RHEL-9] NFSD: Mark exports of NFS as unsupported

Benjamin Coddington requested to merge bcodding/centos-stream-9:bz_2150887_reexport_unsupported into main

It is possible to re-export NFS filesystems, and there's some interest in doing so within the upstream NFS community. However there are a number of tricky problems to addresss before Red Hat is willing to support this configuration, and these issues are not likely to be immediately apparent to a customer that might attempt to build a solution on re-export.

Normally we would mark this sort of configuration as TECH PREVIEW, however doing so implies that Red Hat has committed to fully supporting the feature in an upcoming release. Instead of making this promise with mark_tech_preview(), we will emit a kernel warning to increase customer awareness of the potential issues with this configuration.

Upstream-status: RHEL-only
Tested: manually
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2150887
Signed-off-by: Benjamin Coddington bcodding@redhat.com

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