kfs – disk file system

disk/kfs [ –rc ] [ –b n ] [ –f file ] [ –n name ] [ –p perm ] [ –s ] [ –B nbuf ]

Kfs is an old, local user–level file server for a Plan 9 terminal with a disk. It maintains a hierarchical Plan 9 file system on the disk and offers 9P (see intro(5)) access to it. Kfs begins by checking the file system for consistency, rebuilding the free list, and placing a file descriptor in /srv/name, where name is the service name (default kfs). If the file system is inconsistent, the user is asked for permission to ream (q.v.) the disk. The file system is not checked if it is reamed.

The options are
b n      If the file system is reamed, use n byte blocks. Larger blocks make the file system faster and less space efficient. 1024 and 4096 are good choices. N must be a multiple of 512.
c        Do not check the file system.
f file     Use file as the disk. The default is /dev/sdC0/fs.
n name   Use as the name of the service.
p perm    Use perm as the initial permissions for the command channel /srv/service.cmd; the default is 660.
r        Ream the file system, erasing all of the old data and adding all blocks to the free list.
s        Post file descriptor zero in /srv/service and read and write protocol messages on file descriptor one.
B        Allocate nbuf in–memory file system blocks. The default is as many as will fit in 10% of memory or two megabytes, whichever is smaller.

Create a file system with service name kfs.local and mount it on /n/kfs.
% disk/kfs –rb4096 –nlocal
% mount –c /srv/kfs.local /n/kfs

/dev/sdC0/fs   Default file holding blocks.


fossil(4), kfscmd(8), mkfs(8), prep(8), sd(3)

For the moment, kfs serves both the old (third edition) and new (fourth edition) versions of 9P, deciding which to serve by sniffing the first packet on each connection.

Kfs doesn't allow creating files with component names longer than 28 bytes.

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