From: Olga Kornievskaia <kolga@xxxxxxxxxx> This patch series adds client-side support for doing NFSv4.2 "inter" copy offload between different NFS servers. In case of the "inter" SSC copy files reside on different servers and thus under different superblocks and require that VFS removes the restriction that src and dst files must be on the same superblock. NFS's copy_file_range() determines if the copy is "intra" or "inter" and for "inter" it sends the COPY_NOTIFY to the source server. Then, it would send of an asynchronous COPY to the destination server. If an application cancels an in-flight COPY, OFFLOAD_CANCEL is sent to both of the servers. This patch series also include necessary client-side additions that are performed by the destination server. The server needs an NFS open that represents a source file without doing an actual open. Two function nfs42_ssc_open/nfs42_ssc_close() are introduced to accomplish it that make use of the VFS's alloc_file_pseudo(). This patch series depends on removal of the cross-device check which was done in Amir's VFS generic copy_file_range support. v9: --- reworked reboot recovery for the source server. previously copies were stored on the destination's server structure list, but when source server reboots it can't wake up the waiting copies to be redone. Instead now add the copy to both the source server and the destination server so that during recovery we can find it on either of the servers' lists. --- when a source server rebooted and the destination server wasn't able to read any bytes and in the callback it returns NFS4ERR_PARTNER_NO_AUTH with 0 bytes, treat that as source server reboot. Olga Kornievskaia (11): NFS NFSD: defining nl4_servers structure needed by both NFS: add COPY_NOTIFY operation NFS: add ca_source_server<> to COPY NFS: also send OFFLOAD_CANCEL to source server NFS: inter ssc open NFS: skip recovery of copy open on dest server NFS: for "inter" copy treat ESTALE as ENOTSUPP NFS: COPY handle ERR_OFFLOAD_DENIED NFS handle NFS4ERR_PARTNER_NO_AUTH error NFS: handle source server reboot NFS: replace cross device check in copy_file_range fs/nfs/nfs42.h | 15 +++- fs/nfs/nfs42proc.c | 193 +++++++++++++++++++++++++++++++++++++++------- fs/nfs/nfs42xdr.c | 190 ++++++++++++++++++++++++++++++++++++++++++++- fs/nfs/nfs4_fs.h | 11 +++ fs/nfs/nfs4client.c | 2 +- fs/nfs/nfs4file.c | 125 +++++++++++++++++++++++++++++- fs/nfs/nfs4proc.c | 7 +- fs/nfs/nfs4state.c | 40 ++++++++-- fs/nfs/nfs4xdr.c | 1 + include/linux/nfs4.h | 25 ++++++ include/linux/nfs_fs.h | 4 +- include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 17 ++++ 13 files changed, 586 insertions(+), 45 deletions(-) -- 1.8.3.1
