Since some known workloads do open files with O_WRONLY can benefit from write delegations, we want to allow them. The patch set is based on the initial attempt by Dai Ngo in: https://lore.kernel.org/linux-nfs/1688089960-24568-3-git-send-email-dai.ngo@xxxxxxxxxx/ THe problem back then was a reported breakage in pynfs test that exercises reads using anonymous stateids. Changes from v1: - collected review tags - remove f_mode tinkering and instead open locally a file as rw in case the client opened the file as wronly and got a write delegation - splitted the anonymous stateid read conflict handling to a separate patch Sagi Grimberg (3): nfsd: don't assume copy notify when preprocessing the stateid nfsd: Offer write delegations for o_wronly opens nfsd: resolve possible conflicts of reads using special stateids and write delegations fs/nfsd/nfs4proc.c | 25 +++++++++++- fs/nfsd/nfs4state.c | 95 ++++++++++++++++++++++++++++++++------------- fs/nfsd/state.h | 2 + fs/nfsd/xdr4.h | 2 + 4 files changed, 95 insertions(+), 29 deletions(-) -- 2.43.0
