clwalk(5) [plan9 man page]

CLWALK(5)							File Formats Manual							 CLWALK(5)

NAME

       clwalk - clone, then search a directory, and change to a file within it

SYNOPSIS

       Tclwalk	tag[2] fid[2] newfid[2] name[28]
       Rclwalk	tag[2] fid[2] qid[8]

DESCRIPTION

       The clwalk request is a combination of a clone request (see clone(5)) followed by a walk request (see walk(5)) on the new fid.  If the walk
       fails, there is an implicit clunk of newfid.

ENTRY POINTS

       The clwalk message is an optimization for use on low-speed lines; it is not generated by the kernel.  The cfs(4) cached file system  gener-
       ates it as a side-effect of any system call that interprets a file name.

																	 CLWALK(5)

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)