On Fri, Nov 3, 2017 at 3:57 PM, Olga Kornievskaia <aglo@xxxxxxxxx> wrote: > On Tue, Oct 24, 2017 at 1:47 PM, Olga Kornievskaia <kolga@xxxxxxxxxx> wrote: >> To do asynchronous copies, NFSD creates a new kthread to handle the request. >> Upon receiving the COPY, it generates a unique copy stateid (stored in a >> global list for keeping track of state for OFFLOAD_STATUS to be queried by), >> starts the thread, and replies back to the client. nfsd4_copy arguments that >> are allocated on the stack are copies for the kthread. >> >> For the async copy handler, copy is done in the loop for the requested >> number of bytes. If an error is encountered and partial copy has happened, >> a successful partial copy is returned in the CB_OFFLOAD. vfs_copy_file_range >> is called with 4MB chunks for both async and sync, allowing for 4MB >> granularity of OFFLOAD_STATUS queiry. Once copy is done, the results are >> queued for the callback workqueue and sent via CB_OFFLOAD. >> >> When the server received an OFFLOAD_CANCEL, it will find the kthread running >> the copy and will send a SIGPENDING and kthread_stop() and it will interrupt >> the ongoing do_splice() and once vfs returns we are choosing not to send >> the CB_OFFLOAD back to the client. >> >> When the server receives an OFFLOAD_STATUS, it will find the kthread running >> the copy and will locate within the copy state the current number of bytes >> copied so far. >> >> v6: >> 1. if an error occured and partial bytes were copied, don't return the error >> and instead return the successful partial copy. >> 2. OFFLOAD_STATUS locates the on-going copy and looks up the number of bytes >> copied so far. >> >> 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 return nfs4_stid in nfs4_preprocess_stateid_op >> NFSD create new stateid for async copy >> NFSD handle OFFLOAD_CANCEL op >> NFSD support OFFLOAD_STATUS >> NFSD stop queued async copies on client shutdown >> >> fs/nfsd/netns.h | 8 ++ >> fs/nfsd/nfs4callback.c | 97 +++++++++++++++ >> fs/nfsd/nfs4proc.c | 316 ++++++++++++++++++++++++++++++++++++++++++++----- >> fs/nfsd/nfs4state.c | 77 +++++++++++- >> fs/nfsd/nfs4xdr.c | 50 ++++++-- >> fs/nfsd/nfsctl.c | 1 + >> fs/nfsd/state.h | 21 +++- >> fs/nfsd/xdr4.h | 28 +++++ >> fs/nfsd/xdr4cb.h | 10 ++ >> 9 files changed, 571 insertions(+), 37 deletions(-) > > Bruce, any comments on this version? Bruce, do you have any comments on this version? -- 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
