This depends on the async NFSD series and it depends on the client's inter copy series that provide nfs4_ssc_open/close functions and reboot recovery support for the destination server. NFSD determines if COPY is intra or inter and if sync or async. For inter, NSFD uses NFSv4.1 protocol and creates an internal mount point (superblock). It will destroy the mount point when copy is done. On the source server, upon receiving a COPY_NOTIFY, it generate a unique stateid that's kept in the global list. Upon receiving a READ with a stateid, the code checks the normal list of open stateid and now additionally, it'll check the copy state list as well before deciding to either fail with BAD_STATEID or find one that matches. The stored stateid is only valid to be used for the first time with a choosen lease period (90s currently). When the source server received an OFFLOAD_CANCEL, it will remove the stateid from the global list. Otherwise, the copy stateid is removed upon the removal of its "parent" stateid (open/lock/delegation stateid). v4: * Don't have the IS_STALE_FH in the compount state structure. Instead mark the filehandle FOREIGN. If the server gets a PUTFH,SAVEFH,PUTFH... COPY compount then it'll allow for the PUTFH to be STALE (foreign) handle. It * This series has Bruce's proposed "nfsd: remove unnecessary nofilehandle checks" patch as I didn't see it committed yet. * dropped the support for multiple server netaddrs in the COPY_NOTIFY/ COPY * made sure to return OFFLOAD_DENIED when mount to the source server fails which triggers the client to fallback on the traditional copy. Andy Adamson (1): NFSD generalize nfsd4_compound_state flag names Olga Kornievskaia (7): NFSD fill-in netloc4 structure NFSD add ca_source_server<> to COPY NFSD add COPY_NOTIFY operation NFSD check stateids against copy stateids nfsd: remove unnecessary nofilehandle checks NFSD: allow inter server COPY to have a STALE source server fh NFSD add nfs4 inter ssc to nfsd4_copy fs/nfsd/Kconfig | 10 ++ fs/nfsd/nfs4proc.c | 427 ++++++++++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfs4state.c | 37 ++++- fs/nfsd/nfs4xdr.c | 168 +++++++++++++++++++- fs/nfsd/nfsd.h | 31 +++- fs/nfsd/nfsfh.h | 5 +- fs/nfsd/state.h | 5 +- fs/nfsd/xdr4.h | 25 ++- include/linux/nfs4.h | 1 + 9 files changed, 657 insertions(+), 52 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
