From: Chuck Lever <chuck.lever@xxxxxxxxxx> SCSI implementation experience has shown that an interrupt-only COPY offload implementation is not reliable. There are too many common scenarios where the client can miss the completion interrupt (in our case, this is a CB_OFFLOAD callback). Therefore, a polling mechanism is needed. The NFSv4.2 protocol provides one in the form of the new OFFLOAD_STATUS operation. Linux NFSD implements OFFLOAD_STATUS already. This series adds a Linux NFS client implementation of the OFFLOAD_STATUS operation that can query the state of a background COPY on the server. These patches are also available here: https://git.kernel.org/pub/scm/linux/kernel/git/cel/linux.git/log/?h=fix-async-copy Changes since v1: - nfs42_proc_offload_status() now uses a synchronous RPC Chuck Lever (7): NFS: CB_OFFLOAD can return NFS4ERR_DELAY NFS: Fix typo in OFFLOAD_CANCEL comment NFS: Rename struct nfs4_offloadcancel_data NFS: Implement NFSv4.2's OFFLOAD_STATUS XDR NFS: Implement NFSv4.2's OFFLOAD_STATUS operation NFS: Use NFSv4.2's OFFLOAD_STATUS operation NFS: Refactor trace_nfs4_offload_cancel fs/nfs/callback_proc.c | 2 +- fs/nfs/nfs42proc.c | 188 ++++++++++++++++++++++++++++++++++---- fs/nfs/nfs42xdr.c | 88 +++++++++++++++++- fs/nfs/nfs4proc.c | 3 +- fs/nfs/nfs4trace.h | 11 ++- fs/nfs/nfs4xdr.c | 1 + include/linux/nfs4.h | 1 + include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 5 +- 9 files changed, 275 insertions(+), 25 deletions(-) -- 2.47.0
