This is server-side support for NFSv4.2 inter and async COPY which is on top of existing intra sync COPY. It also depends on the NFS client piece for NFSv4.2 to do client side of the destination server piece in the inter SSC. 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. To do asynchronous copies, NFSD creates a single threaded workqueue and does not tie up an NFSD thread to complete the copy. Upon receiving the COPY, it generates a unique copy stateid (stores a global list for keeping track of state for OFFLOAD_STATUS to be queried by), queues up a workqueue for the copy, and replies back to the client. nfsd4_copy arguments that are allocated on the stack are copied for the work item. In the async copy handler, it calls into VFS copy_file_range() with 4MB chunks and loops until it completes the requested copy size. If error is encountered it's saved but also we save the amount of data copied so far. Once done, the results are queued for the callback workqueue and sent via CB_OFFLOAD. Also currently, choosing to clean up the copy state information stored in the global list when cope is done and not doing it when callback's release function (it could be done there alternatively if needed it?). 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). Andy Adamson (7): NFSD add ca_source_server<> to COPY NFSD generalize nfsd4_compound_state flag names NFSD: allow inter server COPY to have a STALE source server fh NFSD return nfs4_stid in nfs4_preprocess_stateid_op NFSD add COPY_NOTIFY operation NFSD add nfs4 inter ssc to nfsd4_copy NFSD Unique stateid_t for inter server to server COPY authentication Olga Kornievskaia (10): NFSD CB_OFFLOAD xdr NFSD OFFLOAD_STATUS xdr NFSD OFFLOAD_CANCEL xdr NFSD xdr callback stateid in async COPY reply NFSD first draft of async copy NFSD handle OFFLOAD_CANCEL op NFSD stop queued async copies on client shutdown NFSD create new stateid for async copy NFSD define EBADF in nfserrno NFSD support OFFLOAD_STATUS fs/nfsd/Kconfig | 10 + fs/nfsd/netns.h | 8 + fs/nfsd/nfs4callback.c | 95 +++++++ fs/nfsd/nfs4proc.c | 704 ++++++++++++++++++++++++++++++++++++++++++++++--- fs/nfsd/nfs4state.c | 142 +++++++++- fs/nfsd/nfs4xdr.c | 266 ++++++++++++++++++- fs/nfsd/nfsctl.c | 2 + fs/nfsd/nfsd.h | 2 + fs/nfsd/nfsproc.c | 1 + fs/nfsd/state.h | 32 ++- fs/nfsd/xdr4.h | 53 +++- fs/nfsd/xdr4cb.h | 10 + include/linux/nfs4.h | 1 + 13 files changed, 1273 insertions(+), 53 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
