tree acd4b6cfa7962a1cee7e9c81f11bd9ccb0d3ff24
parent 25c7f41e9234f60af30e086278f1de7974f8816f
author Pavel Shilovsky <piastry@etersoft.ru> 1306389720 +0000
committer Steve French <sfrench@us.ibm.com> 1306468636 +0000

CIFS: Add rwpidforward mount option

Add rwpidforward mount option that switches on a mode when we forward
pid of a process who opened a file to any read and write operation.

This can prevent applications like WINE from failing on read or write
operation on a previously locked file region from the same netfd from
another process if we use mandatory brlock style.

It is actual for WINE because during a run of WINE program two processes
work on the same netfd - share the same file struct between several VFS
fds:
1) WINE-server does open and lock;
2) WINE-application does read and write.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>