NFS updates for CLSF
- 2. Agenda • nfs protocol • nfs • nfsd
- 3. nfsv42 features • https://tools.ietf.org/id/draft-ietf-nfsv4-minorversion2-27.txt • server side copy • IO_ADVISE • sparse files: • READ_PLUS, DEALLOCATE, SEEK(_HOLE/_DATA) • space reservation: • ALLOCATE • application data block • WRITE_SAME • labeled NFS • support MAC (Mandatory Access Control) security model with new file attribute sec_label
- 4. nfsv41 flexfiles • https://tools.ietf.org/id/draft-bhalevy-nfsv4-flex-files- 03.txt • A simple device information model suitable for aggregating standalone NFS servers into a centrally managed pNFS cluster
- 5. nfs updates • migration support (Chuck, v3.13) through NFSERR_MOVED and GETATTR(fs_location) • no retransmit for NFSv4 unless TCP connection breaks (Trond, v3.13) • finer grained handling of connection errors in RPC layer (Trond, v3.14) • add a lot of tracepoints for debugging NFSv4 state recovery and SUNRPC socket connection state (Trond, v3.15) • xprtrdma connection drop recovery, cleanups and fixes (Chuck, v3.16)
- 6. nfs updates (cont.) • Support multiple NFS read/write requests per page in order to deal with non-page aligned pNFS striping (Dros, v3.16) • NFS read/write path cleanup and merge (Dros and Anna, v3.16) • LOOKUP_RCU support (Neil, v3.17) • Replace use of PF_TRANS with a more generic mechanism for avoiding deadlocks in nfs_release_page (Neil, v3.18) • mmap write performance improvement with FLUSH_COND_STABLE for WB_SYNC_ALL (Neil v3.18) • pNFS block driver fixes and refactors: no more getdevicelist, force read-modify- write for partial page writes, new extent tracking tree (Christoph, v3.18) • SEEK_HOLE/SEEK_DATA support (Anna, v3.18)
- 7. nfsd updates • svrrdma fixes and cleanups (Chuck and Steve Wise, v3.17) • get rid of client_mutex that protects any nfsv4 state (Jeff and Trond, v3.17, 114 patches) • support the NFSv4.2 SEEK operation (Anna, v3.18) • SUNRPC server scalability issues (pool->sp_lock, no ioctl in receive fast path, etc) (Trond, v3.18) • reply cache scalability improvements (per-bucket lru/spinlock, etc) (Trond, v3.18) • end the grace period early in a number of cases (Jeff, v3.18)
- 8. TODOs • NFSoRDMA • NFSv41 flexfiles • NFSv42 • nfsd scalability