B.3 | Mandatory Share Mode (Open Mode) Locks |
| CIFS/NFS Open Mode Locking |
CIFS | Old Behavior |
Open Mode Lock
Byte Range Lock
Samba | Samba Internal | NLM |
Locking | Network Lock | |
| Mechanism | |
|
| Manager |
User space |
| User space |
|
| |
Kernel space |
| Kernel space |
|
| KLM |
|
| Kernel Lock |
|
| Manager |
Open Mode Locks DO NOT | JFS 3.3 File System | |
Interoperate at KLM! | ||
|
Previously, CIFS/9000 Mandatory Share Mode (Open Mode) locks were processed and managed by the Samba Internal Locking Mechanism only. They were not translated into the UNIX fcntl call and propagated to the Kernel Lock Manager. Therefore, Mandatory Share Mode (Open Mode) locks did not interoperate with NFS Byte Range locks at the KLM, and data corruption could result in those cases where concurrent file access by both CIFS and NFS clients was probable
See Appendix B4 for HP’s enhancement for this issue.
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