HP CIFS File Locking Interoperation

B.4 Mandatory Share Mode (Open Mode) Enhancement

CIFS/9000 has been enhanced to translate Windows Mandatory Share Mode (Open Mode)

locks into UNIX Byte-Range locks using the fcntl function. The resulting Byte-Range locks

will interoperate in the KLM with NFS Byte-Range locks, and data integrity will be provided

for concurrent CIFS/NFS cross platform file access when the advisory locking protocol is

adhered to. This is the most useful locking feature for providing additional data integrity for

HP’s customers that will be accessing a common file set from Windows and NFS clients.

CIFS/NFS Open Mode Locking

New– HP-UX AR 0901

Samba

Samba Internal

Locking

Mechanism

NLM

Network Lock

Manager

KLM

Kernel Lock

Manager

User space

Kernel space Kernel space

User space

HP-UX 11

JFS 3.3 File System

CIFS NFS

Open Mode Lock Byte Range Lock

Translate Open Mode Locks

to Byte Range Locks!

Byte Range Lock