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LEARN ABOUT PLAN9

cfs

CFS(4)							     Kernel Interfaces Manual							    CFS(4)

NAME

       cfs - cache file system

SYNOPSIS

       cfs -s [-rd] [-f partition]

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

DESCRIPTION

       Cfs is a user-level file server that caches information about 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 kernel 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:

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

       a netaddr
	      dial the destination netaddr to connect to a remote file server.

       r      reformat the cache disk partition.

       d      turn on debugging

       f partition
	      use file partition as the cache disk partition.

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

FILES

       /dev/hd0cache
	      Default file used for storing cached data.

SOURCE

       /sys/src/cmd/cfs

																	    CFS(4)