exportfs, srvfs – network file server plumbing|
exportfs [ options ] |
srvfs [ –dR ] [ –p perm ] [ –P patternfile ] [ –e exportprog ] name
Exportfs is a user level file server that allows Plan 9 compute
servers, rather than file servers, to export portions of a name
space across networks. The service is started either by the cpu(1)
command or by a network listener process. An initial protocol
establishes a root directory for the exported name space. The
connection to exportfs is then mounted, typically on /mnt/term.
Exportfs then acts as a relay file server: operations in the imported
file tree are executed on the remote server and the results returned.
This gives the appearance of exporting a name space from a remote
machine into a local file tree. |
The options are:
–N nsfile Serve the name space described by nsfile.
–n Disallow mounts by user none.
–r root Bypass the initial protocol, serving the name space rooted at root. A corresponding import(4) must use the –m option.
–S service Bypass the initial protocol, serving the result of mounting service. A separate mount is used for each attach(5) message, to correctly handle servers in which each mount corresponds to a different client (e.g., rio(4)). A corresponding import(4) must use the –m option.
–s equivalent to –r /; kept for compatibility.
The cpu command uses exportfs to serve device files in the terminal. The import(4) command calls exportfs on a remote machine, permitting users to access arbitrary pieces of name space on other systems.
Because the kernel disallows reads and writes on mounted pipes (as might be found in /srv), exportfs calls itself (with appropriate –m and –S options) to simulate reads and writes on such files.
Srvfs invokes exportprog (default /bin/exportfs) to create a mountable file system from a name space and posts it at /srv/name, which is created with mode perm (default 0600). The name space is the directory tree rooted at path. The –d, –P, and –R options, if present, are relayed to exportprog.
To export the archive of one user for one month, except for secrets,|
dial(2), import(4), aan(8), listen(8)|