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nfs42: do not fail with EIO if ssc returns NFS4ERR_OFFLOAD_DENIED

Benjamin Coddington requested to merge bcodding/centos-stream-9:bz2170423_offload_denied_no_clear_copy into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2170423

commit 4730515378a70064581b27ed112fcfc6f2a379ca
Author: Tigran Mkrtchyan tigran.mkrtchyan@desy.de
Date: Tue Feb 7 18:46:35 2023 +0100

nfs42: do not fail with EIO if ssc returns NFS4ERR_OFFLOAD_DENIED

The NFSv4.2 server even if supports intra-SSC might prefer that for 
a particular file a classic copy is performed. As returning ENOTSUPP
will clear the SSC capability of the server by the client, server
might return NFS4ERR_OFFLOAD_DENIED (well, spec talks about remote
servers there).

Update nfs42_proc_copy to handle NFS4ERR_OFFLOAD_DENIED as ENOTSUPP,
but without clearing NFS_CAP_COPY bit.

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

Signed-off-by: Benjamin Coddington bcodding@redhat.com

Edited by Benjamin Coddington

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