LOCKFS(4)LOCKFS(4)NAMElockfs - exclusive access file server
SYNOPSISlockfs [ -A ] [ -a alg ]... [ -p addr ] dir [ mountpoint ]
DESCRIPTION
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 ini‐
tially 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 algs is passed to server (see secu‐
rity-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.
EXAMPLE
Run a lock server guarding access to /lib/datafiles:
lockfs-p 'tcp!*!32454' /lib/datafiles
Mount the above server (where locksrv was originally run on a server
named machine.
mount -c tcp!machine!32454 /n/remote
SOURCE
/appl/cmd/lockfs.b
BUGS
There's no way to break a lock held by a malingering process.
Should probably support multi-level directories.
LOCKFS(4)
