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