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freebsd-dev/sbin/fsck_ffs/SMM.doc/0.t

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BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
1994-05-26 06:35:07 +00:00
.\" Copyright (c) 1986, 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.
.\" 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
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" SUCH DAMAGE.
.\"
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
.\" $FreeBSD$
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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.\" @(#)0.t 8.1 (Berkeley) 6/8/93
.\"
.if n .ND
.TL
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
Fsck_ffs \- The UNIX\(dg File System Check Program
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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.EH 'SMM:3-%''The \s-2UNIX\s+2 File System Check Program'
.OH 'The \s-2UNIX\s+2 File System Check Program''SMM:3-%'
.AU
Marshall Kirk McKusick
.AI
Computer Systems Research Group
Computer Science Division
Department of Electrical Engineering and Computer Science
University of California, Berkeley
Berkeley, CA 94720
.AU
T. J. Kowalski
.AI
Bell Laboratories
Murray Hill, New Jersey 07974
.AB
.FS
\(dgUNIX is a trademark of Bell Laboratories.
.FE
.FS
This work was done under grants from
the National Science Foundation under grant MCS80-05144,
and the Defense Advance Research Projects Agency (DoD) under
Arpa Order No. 4031 monitored by Naval Electronic System Command under
Contract No. N00039-82-C-0235.
.FE
This document reflects the use of
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
.I fsck_ffs
s/filesystem/file system/g as discussed on -developers
2002-08-21 18:11:48 +00:00
with the 4.2BSD and 4.3BSD file system organization. This
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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is a revision of the
original paper written by
T. J. Kowalski.
.PP
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
File System Check Program (\fIfsck_ffs\fR)
s/filesystem/file system/g as discussed on -developers
2002-08-21 18:11:48 +00:00
is an interactive file system check and repair program.
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
.I Fsck_ffs
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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uses the redundant structural information in the
s/filesystem/file system/g as discussed on -developers
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UNIX file system to perform several consistency checks.
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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If an inconsistency is detected, it is reported
to the operator, who may elect to fix or ignore
each inconsistency.
These inconsistencies result from the permanent interruption
s/filesystem/file system/g as discussed on -developers
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of the file system updates, which are performed every
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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time a file is modified.
Unless there has been a hardware failure,
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
.I fsck_ffs
s/filesystem/file system/g as discussed on -developers
2002-08-21 18:11:48 +00:00
is able to repair corrupted file systems
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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using procedures based upon the order in which UNIX honors
s/filesystem/file system/g as discussed on -developers
2002-08-21 18:11:48 +00:00
these file system update requests.
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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.PP
The purpose of this document is to describe the normal updating
s/filesystem/file system/g as discussed on -developers
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of the file system,
to discuss the possible causes of file system corruption,
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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and to present the corrective actions implemented
by
Reviewed by: rwatson, bp Approved by: rwatson Obtained from: NetBSD-current source tree The beginnings of the fsck wrappers stuff from NetBSD. This particular commit brings a newly repo-copied sbin/fsck_ffs/ (from sbin/fsck/) into fsck wrappers mode. A quick overview (the code reflects this): * Documentation changed to reflect fsck_ffs instead of fsck * Simply acts on a single filesystem, doesn't try to do any multiple filesystem magic - this is done by the fsck wrappers now And then specific to fsck_ffs: * link to /sbin/fsck_4.2bsd and /sbin/fsck_ufs. This is because right now the filesystem is of type ufs not ffs, and that during autodetection the labeltype rather than the VFS type is used - this is because when doing an autodetection of filesystem type in the fsck wrapper program, it does not have any link between label type (4.2bsd, vinum, etc) and VFS string. Note that this shouldn't break a build since the required buildworld Makefile magic and import of the fsck wrapper code into src/sbin/fsck/ will happen in a seperate commit.
2000-10-09 08:26:35 +00:00
.I fsck_ffs.
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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Both the program and the interaction between the
program and the operator are described.
.sp 2
.LP
Fix the case where fsck would not see sparse directories and the kernel would panic. If such a thing is fixed fsck needs a rerun (and bugs the user to do so). Reviewed by: Kirk McKusick
1996-10-08 14:54:53 +00:00
Revised October 7, 1996
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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.AE
.LP
.bp
.ce
.B "TABLE OF CONTENTS"
.LP
.sp 1
.nf
.B "1. Introduction"
.LP
.sp .5v
.nf
s/filesystem/file system/g as discussed on -developers
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.B "2. Overview of the file system
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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2.1. Superblock
2.2. Summary Information
2.3. Cylinder groups
2.4. Fragments
s/filesystem/file system/g as discussed on -developers
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2.5. Updates to the file system
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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.LP
.sp .5v
.nf
s/filesystem/file system/g as discussed on -developers
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.B "3. Fixing corrupted file systems
BSD 4.4 Lite sbin Sources Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
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3.1. Detecting and correcting corruption
3.2. Super block checking
3.3. Free block checking
3.4. Checking the inode state
3.5. Inode links
3.6. Inode data size
3.7. Checking the data associated with an inode
3.8. File system connectivity
.LP
.sp .5v
.nf
.B Acknowledgements
.LP
.sp .5v
.nf
.B References
.LP
.sp .5v
.nf
.B "4. Appendix A
4.1. Conventions
4.2. Initialization
4.3. Phase 1 - Check Blocks and Sizes
4.4. Phase 1b - Rescan for more Dups
4.5. Phase 2 - Check Pathnames
4.6. Phase 3 - Check Connectivity
4.7. Phase 4 - Check Reference Counts
4.8. Phase 5 - Check Cyl groups
4.9. Cleanup
.ds RH Introduction
.bp
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