cfs man page on Plan9

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CFS(4)									CFS(4)

       cfs - cache file system

       cfs -s [-dknrS] [-f partition]

       cfs -a netaddr [-dknrS] [-f partition] [mtpt]

       cfs -F srvfile [-dknrS] [-f partition] [mtpt]

       Cfs is a user-level file server that caches data from remote files onto
       a local disk.  It is normally started  by  the  kernel  at  boot	 time,
       though users may start it manually.  Cfs is interposed between the ker‐
       nel and a network connection to a remote file  server  to  improve  the
       efficiency  of  access  across  slow  network connections such as modem
       lines.  On each open of a file cfs checks  the  consistency  of	cached
       information and discards any old information for that file.

       Cfs mounts onto mtpt (default /) after connecting to the file server.

       The options are:

       a netaddr
	      dial the destination netaddr to connect to a remote file server.
	      Exclusive with -F.

       d      turn on debugging.

       f partition
	      use file partition as the cache disk partition.

       F srvfile
	      open srvfile (often a file under /srv) to connect	 to  a	remote
	      file server.  Exclusive with -a.

       k      keep  cache contents even if they might have come from a differ‐
	      ent server.  Cfs will obey -r even if -k is given.

       n      mount the remote file server without authentication; often  use‐
	      ful with -F.

       r      reformat the cache disk partition.

       s      the  connection to the remote file server is on file descriptors
	      0 and 1.

       S      turn on statistics gathering.  A file called cfsctl at the  root
	      of  the  caching	file system can be read to get statistics con‐
	      cerning number of calls/bytes on client  and  server  sides  and

       All  9P messages except read, clone, and walk (see intro(5)) are passed
       through cfs unchanged to the remote server.  If	possible,  a  read  is
       satisfied  by  cached  data.  Otherwise, the file server is queried for
       any missing data.

	      Default file used for storing cached data.


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