fstab.5

操作系统设计与实现源码

.TH FSTAB 5
.SH NAME
fstab, mtab \- list of file systems to mount, mounted file system table.
.SH SYNOPSIS
.B /etc/fstab
.sp
.B /etc/mtab
.SH DESCRIPTION
.B /etc/fstab
is a table of file system to mount at boot time,
.B /etc/mtab
is a table of currently mounted file systems as maintained by
.B mount
and
.BR umount .
.PP
.B /etc/fstab
is not read by
.B mount
as it should be.  It is instead a simple shell script listing the three
devices that Minix needs to operate:  The device names of the root file
system, the temporary (scratch) file system, and the file system for
.BR /usr .
Of these only the /usr file system is mounted in
.BR /etc/rc ,
the scratch file system is there for the system administrator to test new
kernels, or as a temporary file system.
.PP
.B /etc/mtab
contains lines of four fields.  The layout is:
.sp
.RS
.nf
.ft B
.ta +10n +13n +8n
device	directory	type	options
.ft P
.fi
.RE
.PP
These fields may be explained as follows:
.sp
.B device
.br
.RS
A block special device.
.RE
.sp
.B directory
.br
.RS
Mount point.
.RE
.sp
.B type
.br
.RS
Either
.BR 1 ,
or
.BR 2 ,
indicating a V1 or V2 file system.
.RE
.sp
.B options
.br
.RS
Either
.BR ro ,
or
.BR rw ,
indicating a read-only or read-write mounted file system.
.RE
.SH FILES
.TP 15n
.B /etc/fstab
Shell script naming three important file systems.
.TP
.B /etc/mtab
List of mounted file systems.
.SH "SEE ALSO"
.BR printroot (8),
.BR mount (1),
.BR fsck (1),
.BR mkfs (1).
.SH BUGS
.B /etc/fstab
is a joke.
.SH AUTHOR
Kees J. Bot ([e-mail])