pfs, PFS - portable file system
The Portable File System, or PFS, allows access to a variety of CD-ROM
file systems. Currently supported file systems include: iso9660, high
sierra, RockRidge Interchange.
The PFS package consists of 7 programs:
pfs_mountd is responsible for maintaining local and
remote mounts. It must be running on both
PFS clients and PFS servers. The pfs_mountd
program validates arguments, and spawns
pfs_mountd.rpc is the RPC server code associated with
pfs_mountd. It should not be executed
pfsd responds to all client requests for a given
mounted CD-ROM file system. pfsd needs to
be running on all systems designated as PFS
servers. pfsd validates arguments, and
pfsd.rpc is the RPC server code associated with pfsd.
It should not be executed directly.
pfs_exportfs makes local directories available for
mounting by PFS clients.
pfs_mount mounts CD-ROM file system locally or from
pfs_umount unmounts CD-ROM file system locally or from
Client file access calls are converted to PFS protocol requests, and
are sent to the server system over the network. The server receives
the request, performs the actual file system operation, and sends a
response back to the client.
The Portable File System operates in a stateful fashion using remote
procedure (RPC - rfc1057) calls built on top of external data
representation (XDR - rfc1014) protocol. The RPC protocol provides
for version and authentication parameters to be exchanged for security
over the network.
A server can grant access to a specific filesystem to certain clients
by adding an entry for that filesystem to the server's
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/etc/pfs_exports file and running pfs_exportfs(1M).
A client gains access to that filesystem with the pfs_mount command.
Once the filesystem is mounted by the client, the server issues a file
handle to the client for each file (or directory) the client accesses
or creates. If the disc is unmounted at the server, the file handles
becomes stale, and remote requests will return stale file handle
A server may also be a client with respect to filesystems it has
mounted over the network, but its clients cannot gain access to those
filesystems. Instead, the client must mount a filesystem directly
from the server on which it resides.
Generally physical disk I/O errors detected at the server are returned
to the client for action. If the server is down or inaccessible, the
client will see the message:
PFS server host not responding, retrying...
It will retry 4 times, and then finally return failure.
pfs was developed by Young Minds, Inc.
pfs_exports(5), fstab(4), pfs_mount(1M), pfs_exportfs(1M), pfsd(1M).
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