MKFS(8) GENIX Programmer's Manual MKFS(8)
NAME
mkfs - construct a file system
SYNOPSIS
/etc/mkfs special size [ m n ]
/etc/mkfs special proto
DESCRIPTION
Mkfs constructs a file system by writing on the special file spe-
cial. In the first form of the command a numeric size is given and
mkfs builds a file system with a single empty directory on it. The
number of i-nodes is calculated as a function of the filesystem
size. (No boot program is initialized in this form of mkfs.)
N.B.: All filesystems should have a lost+found directory for
fsck(8); this should be created for each file system by running
mklost+found(8) in the root directory of a newly created file sys-
tem, after the file system is first mounted.
In bootstrapping, the second form of mkfs is sometimes used. In
this form, the file system is constructed according to the direc-
tions found in the prototype file proto. The prototype file contains
tokens separated by spaces or new lines. The first token is the
name of a file to be copied onto sector zero as the bootstrap pro-
gram. The second token is a number specifying the size of the
created file system. Typically it will be the number of blocks on
the device, perhaps diminished by space for swapping. The next
token is the number of i-nodes in the i-list. The next set of
tokens comprise the specification for the root file. File specifi-
cations consist of tokens giving the mode, the user-id, the group
id, and the initial contents of the file. The syntax of the con-
tents field depends on the mode.
The mode token for a file is a 6 character string. The first char-
acter specifies the type of the file. (The characters -bcd specify
regular, block special, character special and directory files
respectively.) The second character of the type is either u or - to
specify set-user-id mode or not. The third is g or - for the set-
group-id mode. The rest of the mode is a three digit octal number
giving the owner, group, and other read, write, execute permissions,
see chmod(1).
Two decimal number tokens come after the mode; they specify the user
and group ID's of the owner of the file.
If the file is a regular file, the next token is a pathname whence
the contents and size are copied.
If the file is a block or character special file, two decimal number
tokens follow which give the major and minor device numbers.
Printed 11/16/83 1
MKFS(8) GENIX Programmer's Manual MKFS(8)
If the file is a directory, mkfs makes the entries . and .. and
then reads a list of names and (recursively) file specifications for
the entries in the directory. The scan is terminated with the token
$.
A sample prototype specification follows:
/usr/mdec/uboot
4872 55
d--777 3 1
usr d--777 3 1
sh ---755 3 1 /bin/sh
ken d--755 6 1
$
b0 b--644 3 1 0 0
c0 c--644 3 1 0 0
$
$
The arguments m and n specify the interleave factor. M should
always be 3 and you should use the following table to choose n. as
follows.
RM03 80
RM05 304
RM80 217
RP06 209
RP07 800
SI/CDC 9766 304
RK07 33
EMULEX/AMPEX 300M 304
EMULEX/FUJITSU 160M 160
SEE ALSO
filsys(5), dir(5), fsck(8), mklost+found(8)
BUGS
There should be some way to specify links.
There should be some way to specify bad blocks.
Should make lost+found automatically.
Printed 11/16/83 2