lockfs - exclusive access file server lockfs [ -A ] [ -a alg ]... [ -p addr ] dir [ mountpoint ] Lockfs acts as a filesystem layer above an existing namespace, allowing multiple-reader, exclusive writer access to the files therein. Opening a file served by lockfs obtains a lock on the file, or blocks until a lock can be obtained. Lockfs serves a single-level directory that initially contains the files in dir . If the -p option is provided, lockfs will listen for incoming connections on addr , authenticating them as required. Each -a argument provides an acceptable algorithm to run on the connection. The list of all alg s is passed to server (see security-auth (2)). If no -a arguments are given, "-a none" is assumed. If the -A option is given, then no authentication will be performed.

If the -p option is not given, the lockfs file system will be mounted on mountpoint , or dir if mountpoint is not given.

Run a lock server guarding access to /lib/datafiles : .EX lockfs -p 'tcp!*!32454' /lib/datafiles

Mount the above server (where locksrv was originally run on a server named machine .

.EX mount -c tcp!machine!32454 /n/remote /appl/cmd/lockfs.b There's no way to break a lock held by a malingering process.

Should probably support multi-level directories.