mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-18 10:35:55 +00:00
84 lines
3.2 KiB
Perl
84 lines
3.2 KiB
Perl
.\" Copyright (c) 1982, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)1.t 8.1 (Berkeley) 6/5/93
|
|
.\"
|
|
.ds RH Introduction
|
|
.NH
|
|
Introduction
|
|
.PP
|
|
This document reflects the use of
|
|
.I fsck
|
|
with the 4.2BSD and 4.3BSD file system organization. This
|
|
is a revision of the
|
|
original paper written by
|
|
T. J. Kowalski.
|
|
.PP
|
|
When a UNIX
|
|
operating system is brought up, a consistency
|
|
check of the file systems should always be performed.
|
|
This precautionary measure helps to insure
|
|
a reliable environment for file storage on disk.
|
|
If an inconsistency is discovered,
|
|
corrective action must be taken.
|
|
.I Fsck
|
|
runs in two modes.
|
|
Normally it is run non-interactively by the system after
|
|
a normal boot.
|
|
When running in this mode,
|
|
it will only make changes to the file system that are known
|
|
to always be correct.
|
|
If an unexpected inconsistency is found
|
|
.I fsck
|
|
will exit with a non-zero exit status,
|
|
leaving the system running single-user.
|
|
Typically the operator then runs
|
|
.I fsck
|
|
interactively.
|
|
When running in this mode,
|
|
each problem is listed followed by a suggested corrective action.
|
|
The operator must decide whether or not the suggested correction
|
|
should be made.
|
|
.PP
|
|
The purpose of this memo is to dispel the
|
|
mystique surrounding
|
|
file system inconsistencies.
|
|
It first describes the updating of the file system
|
|
(the calm before the storm) and
|
|
then describes file system corruption (the storm).
|
|
Finally,
|
|
the set of deterministic corrective actions
|
|
used by
|
|
.I fsck
|
|
(the Coast Guard
|
|
to the rescue) is presented.
|
|
.ds RH Overview of the File System
|