On Fri, Nov 10, 2017 at 10:01:02AM -0500, Olga Kornievskaia wrote: > 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? I don't yet, apologies. It is on my list to look at. --b. -- 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
