mkfs(1M) (s5) mkfs(1M)
NAME
mkfs (s5) - construct an s5 file system
SYNOPSIS
mkfs [-F s5] [generic_options] special
mkfs [-F s5] [generic_options] [-b block_size] special blocks[:i-
nodes] [gap blocks/cyl]
mkfs [-F s5] [generic_options] [-b block_size] special proto [gap
blocks/cyl]
DESCRIPTION
generic_options are options supported by the generic mkfs command.
mkfs constructs an s5 file system by writing on the special file
using the values found in the remaining arguments of the command
line. mkfs builds a file system with a root directory and a
lost+found directory.
The options are:
-F s5 Specifies an s5-FSType.
-b blocksize
Specifies the logical block size for the file system. The
logical block size is the number of bytes read or written
by the operating system in a single I/O operation. Valid
values for blocksize are 512, 1024, and 2048. The default
is 1024.
If the second argument to mkfs is a string of digits, the size of the
file system is the value of blocks interpreted as a decimal number.
This is the number of physical (512 byte) disk blocks the file system
will occupy. If the number of i-nodes is not given, the default is
approximately the number of logical blocks divided by 4. mkfs builds
a file system with a single empty directory on it. The boot program
block (block zero) is left uninitialized.
If the second argument is the name of a file that can be opened, mkfs
assumes it to be a prototype file proto, and will take its directions
from that file. The prototype file contains tokens separated by
spaces or new-lines. A sample prototype specification follows (line
numbers have been added to aid in the explanation):
1. /dev/c1d0s0
2. 4872 110
3. d--777 3 1
4. usr d--777 3 1
5. sh ---755 3 1 /sbin/sh
6. ken d--755 6 1
7. $
8. b0 b--644 3 1 0 0
8/91 Page 1
mkfs(1M) (s5) mkfs(1M)
9. c0 c--644 3 1 0 0
10. slnk l--777 2 2 /var/tmp
11. $
12. $
Line 1 in the example is the name of a file to be copied onto block
zero as the bootstrap program.
Line 2 specifies the number of physical (512 byte) blocks the file
system is to occupy and the number of i-nodes in the file system.
Lines 3-10 tell mkfs about files and directories to be included in
this file system.
Line 3 specifies the root directory.
Lines 4-6 and 8-10 specify other directories and files.
Line 10 specifies the symbolic link slnk set up in /usr and
containing /var/tmp.
The $ on line 7 tells mkfs to end the branch of the file system it is
on, and continue from the next higher directory. The $ on lines 11
and 12 end the process, since no additional specifications follow.
File specifications give the mode, the user ID, the group ID, and the
initial contents of the file. Valid syntax for the contents field
depends on the first character of the mode.
The mode for a file is specified by a 6-character string. The first
character specifies the type of the file. The character range is
-bcdl to specify regular, block special, character special,
directory, and symbolic link files respectively. The second
character of the mode 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 3 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 IDs of the owner of the file.
If the file is a regular file, the next token of the specification
may be a path name whence the contents and size are copied. If the
file is a block or character special file, two decimal numbers follow
which give the major and minor device numbers. 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. As noted above, the scan is terminated with the token $.
Page 2 8/91
mkfs(1M) (s5) mkfs(1M)
The gap blocks/cyl argument in both forms of the command specifies
the rotational gap and the number of blocks/cylinder. The following
values are recommended for the devices available:
Gap Size Gap Size Gap Size
Device 512-byte FS 1K FS 2K FS Blks/Cyl
_____________________________________________________________________________
10M Hard Disk 8 10 12 72
30M Hard Disk 8 10 12 90
72M Hard Disk 8 10 12 162 (CDC Wren II)
72aM Hard Disk 8 10 12 144 (Micropolis)
72bM Hard Disk 8 10 12 162 (Priam)
72cM Hard Disk 8 10 12 198 (Fujitsu)
If the gap and blocks/cyl are not specified or are considered illegal
values a default value of gap size 10 and 162 blocks/cyl is used.
NOTES
With a prototype file there is no way to specify hard links.
FILES
/etc/vtoc/*
SEE ALSO
generic mkfs(1M), dir(4), fs(4).
chmod(1) in the User's Reference Manual.
8/91 Page 3