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H A Dvfs.c34b91dda Thu Sep 08 17:14:13 CDT 2022 Chuck Lever <chuck.lever@oracle.com> NFSD: Make nfsd4_setattr() wait before returning NFS4ERR_DELAY

nfsd_setattr() can kick off a CB_RECALL (via
notify_change() -> break_lease()) if a delegation is present. Before
returning NFS4ERR_DELAY, give the client holding that delegation a
chance to return it and then retry the nfsd_setattr() again, once.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>