Currently, working for ocfs2 development at Oracle Lnux UEK group.
Previously, for a NAS appliance running Oracle Secure Linux, designed and wrote lock-free fifos to connect NFS CIFS protocols running in user space to the kernel tcp stack. FIFOs implemented on shared memory – user kernel vaddrs mapping to the same paddr. Lock-free achieved by using memory barriers and atomic ops.
Prior to that, 10 years working on enhancing Veritas File System (VxFS) at Veritas/Symantec.