The Linux NFS file locking implementation has a limitation in which NFS file locking requests may only contain cookies that are 8 bytes or smaller.
This limitation means that Linux NFS file locking will not work with NFS clients that use NFS file lock request cookies larger than 8 bytes. Currently, this includes Mac OS X 10.3 and FreeBSD 5 (from which the Mac OS X implementation is derived).
An update for the Linux kernel is available at:
http://www.fys.uio.no/~trondmy/src/Linux-2.4.x/2.4.23-rc1/
Apply the patch linux-2.4.23-03-fix_osx.dif to the Linux kernel sources and rebuild.
Other workarounds:
- Mount the Linux-served NFS filesystems using the -L option, which disables file locking support for that mount.
- To disable all NFS file locking support for the affected client, change its /etc/hostconfig default value "NFSLOCKS=-AUTOMATIC-" to be
"NFSLOCKS=-NO-", and restart.
Note: If the client is also an NFS server, then file locking will also be disabled for service that it offers.
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