04-29-2011
The specification (
http://www.ietf.org/rfc/rfc3530.txt ) delineates read-locks and write-locks.
So, if your systems support mandatory locking, the result will be the same server to client as it is for local file I/O. The locks apply everywhere -> to all nfs clients.
If I open the file lock-write, nobody else can write the file. Nobody else can open the file for read-lock either. On your system - Read locks may be called shared locks; write locks exclusive locks.
I'm not sure what else will help you.
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LEARN ABOUT FREEBSD
nfscbd
NFSCBD(8) BSD System Manager's Manual NFSCBD(8)
NAME
nfscbd -- NFSv4 client side callback daemon
SYNOPSIS
nfscbd [-p port_number] [-P client_principal]
DESCRIPTION
nfscbd runs on a client using NFSv4 to handle callback requests from the NFSv4 server. If no nfscbd is running, NFSv4 mounts will still
work, but the server will never issue Open Delegations to the client.
One callback server and one master server are always started.
The following options are available:
-p port_number
Specifies what port# the callback server should use.
-P client_principal
Specifies the host based principal name to be used as the target for callbacks over RPCSEC_GSS. For KerberosV, it must be in the
client's default keytab file. This client_principal should be the same one specified by the gssname argument being used by nfsv4
mounts. If you do not specify this argument, callbacks will still work over AUTH_SYS, which is what many extant servers use even for
RPCSEC_GSS mounts, as of 2009.
For example, ``nfscbd -p 7654 -P root'' starts the daemon to handle callbacks on port# 7654 and is using the host based principal
root@<client-host>.<dns-domain> as the callback target.
nfscbd listens for service requests at the port defined by NFSV4_CBPORT in /usr/include/fs/nfs/nfs.h, unless -p has been specified. For more
information on what callbacks and Open Delegations do, see Network File System (NFS) Version 4 Protocol, RFC3530.
EXIT STATUS
The nfscbd utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
nfsv4(4), mount_nfs(8)
HISTORY
First introduced with the experimental nfs client for NFSv4 support in 2009.
BSD
April 25, 2009 BSD