reiserfsck.8

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.\" -*- nroff -*-
.\" Copyright 1996-2004 Hans Reiser.
.\" 
.TH REISERFSCK 8 "February 2004" "Reiserfsprogs-3.6.19"
.SH NAME
reiserfsck \- The checking tool for the ReiserFS filesystem.
.SH SYNOPSIS
.B reiserfsck 
[ \fB-afprVy\fR ]
[ \fB--rebuild-sb\fR | \fB--check\fR | \fB--fix-fixable\fR
| \fB--rebuild-tree\fR | \fB--clean-attributes\fR ]
.\" [ \fB-i\fR | \fB--interactive\fR ]
[ \fB-j\fR | \fB--journal\fR \fIdevice\fR ]
[ \fB-z\fR | \fB--adjust-size\fR ]
[ \fB-n\fR | \fB--nolog\fR ]
[ \fB-B\fR | \fB--badblocks \fIfile\fR ]
[ \fB-l\fR | \fB--logfile \fIfile\fR ]
[ \fB-q\fR | \fB--quiet\fR ]
[ \fB-y\fR | \fB--yes\fR ]
.\" [ \fB-b\fR | \fB--scan-marked-in-bitmap \fIbitmap-filename\fR ]
.\" [ \fB-h\fR | \fB--hash \fIhash-name\fR ]
.\" [ \fB-g\fR | \fB--background\fR ]
[ \fB-S\fR | \fB--scan-whole-partition\fR ]
[ \fB--no-journal-available\fR ]
.I device
.SH DESCRIPTION
\fBReiserfsck\fR searches for a Reiserfs filesystem on a device, replays 
any necessary transactions, and either checks or repairs the file system.
.TP
.I device
is the special file corresponding to a device or to a partition (e.g 
/dev/hdXX for an IDE disk partition or /dev/sdXX for a SCSI disk partition).
.SH OPTIONS
.TP
.B --rebuild-sb
This option recovers the superblock on a Reiserfs partition.  Normally you 
only need this option if mount reports "read_super_block: can't find 
a reiserfs file system" and you are sure that a Reiserfs file system is 
there. But remember that if you have used some partition editor program and 
now you cannot find a filesystem, probably something has gone wrong while 
repartitioning and the start of the partition has been changed. If so, 
instead of rebuilding the super block on a wrong place you should find the 
correct start of the partition first.
.TP
.B --check
This default action checks filesystem consistency and reports, but 
does not repair any corruption that it finds. This option may be 
used on a read-only file system mount.
.TP
.B --fix-fixable
This option recovers certain kinds of corruption that do not require 
rebuilding the entire file system tree (\fB--rebuild-tree\fR). Normally 
you only need this option if the \fB--check\fR option reports 
"corruption that can be fixed with \fB--fix-fixable\fR". This includes: 
zeroing invalid data-block pointers, correcting st_size and st_blocks 
for directories, and deleting invalid directory entries.
.TP
.B --rebuild-tree
This option rebuilds the entire filesystem tree using leaf nodes 
found on the device.  Normally you only need this option if the 
\fBreiserfsck --check\fR reports "Running with \fB--rebuild-tree\fR
is required". You are strongly encouraged to make a backup copy 
of the whole partition before attempting the \fB--rebuild-tree\fR 
option. Once \fBreiserfsck --rebuild-tree\fR is started it must
finish its work (and you should not interrupt it), otherwise the
filesystem will be left in the unmountable state to avoid subsequent
data corruptions.
.TP
.B --clean-attributes
This option cleans reserved fields of Stat-Data items. There were days when 
there were no extended attributes in reiserfs. When they were implemented old 
partitions needed to be cleaned first -- reiserfs code in the kernel did not 
care about not used fields in its strutures. Thus if you have used one of the 
old (pre-attrbutes) kernels with a ReiserFS filesystem and you want to use 
extented attribues there, you should clean the filesystem first.
.TP
.B \fB--journal \fIdevice \fR, \fB-j \fIdevice \fR
This option supplies the device name of the current file system journal.  
This option is required when the journal resides on a separate device 
from the main data device (although it can be avoided with the expert
option \fB--no-journal-available\fR).
.TP 
.\" .B --interactive, -i
.\" This makes \fBreiserfsck\fR to stop after each pass completed.
.\" .TP
.B --adjust-size, -z
This option causes \fBreiserfsck\fR to correct file sizes that
are larger than the offset of the last discovered byte.  This
implies that holes at the end of a file will be removed.  File
sizes that are smaller than the offset of the last discovered
byte are corrected by \fB--fix-fixable\fR.
.TP
\fB--badblocks \fIfile\fR, \fB-B \fI file\fR
This option sets the badblock list to be the list of blocks specified in 
the given `file`. The filesystem badblock list is cleared before the new 
list is added. It can be used with \fB--fix-fixable\fR to fix the list of 
badblocks (see \fBdebugreiserfs -B\fR). If the device has bad blocks, every
time it must be given with the \fB--rebuild-tree\fR option.
.TP
\fB--logfile \fIfile\fR, \fB-l \fI file\fR
This option causes \fBreiserfsck\fR to report any corruption it finds 
to the specified log file rather than to stderr.
.TP
.B --nolog, -n
This option prevents \fBreiserfsck\fR from reporting any kinds of corruption.
.TP
.B --quiet, -q
This option prevents \fBreiserfsck\fR from reporting its rate of progress.
.TP
.B --yes, -y
This option inhibits \fBreiserfsck\fR from asking you for confirmation after
telling you what it is going to do. It will assuem you confirm. For safety, 
it does not work with the \fB--rebuild-tree\fR option.
.TP
\fB-a\fR, \fB-p\fR
These options are usually passed by fsck -A during the automatic checking 
of those partitions listed in /etc/fstab. These options cause \fBreiserfsck\fR 
to print some information about the specified filesystem, to check if error 
flags in the superblock are set and to do some light-weight checks. If these 
checks reveal a corruption or the flag indicating a (possibly fixable) 
corruption is found set in the superblock, then \fBreiserfsck\fR switches 
to the fix-fixable mode. If the flag indicating a fatal corruption is found 
set in the superblock, then \fBreiserfsck\fR finishes with an error.
.TP
.B -V
This option prints the reiserfsprogs version and then exit.
.TP
\fB-r\fR, \fB-f\fR
These options are not yet operational and therefore are ignored.
.SH EXPERT OPTIONS
DO NOT USE THESE OPTIONS UNLESS YOU KNOW WHAT YOU ARE DOING. 
WE ARE NOT RESPONSIBLE IF YOU LOSE DATA AS A RESULT OF THESE
OPTIONS.
.TP
.B \fB\--no-journal-available\fR
This option allows \fBreiserfsck\fR to proceed when the journal device is 
not available. This option has no effect when the journal is located on 
the main data device. NOTE: after this operation you must use \fBreiserfstune\fR 
to specify a new journal device.
.TP
.B --scan-whole-partition, -S
This option causes \fB--rebuild-tree\fR to scan the whole partition but not only 
the used space on the partition.
.SH AN EXAMPLE OF USING reiserfsck
1. You think something may be wrong with a reiserfs partition on /dev/hda1 
or you would just like to perform a periodic disk check.

2. Run \fBreiserfsck --check --logfile check.log /dev/hda1\fR. If \fBreiserfsck 
--check\fR exits with status 0 it means no errors were discovered. 

3. If \fBreiserfsck --check\fR exits with status 1 (and reports about fixable 
corruptions) it means that you should run \fBreiserfsck --fix-fixable --logfile 
fixable.log /dev/hda1\fR.

4. If \fBreiserfsck --check\fR exits with status 2 (and reports about fatal 
corruptions) it means that you need to run \fBreiserfsck --rebuild-tree\fR.  
If \fBreiserfsck --check\fR fails in some way you should also run \fBreiserfsck 
--rebuild-tree\fR, but we also encourage you to submit this as a bug report.

5. Before running \fBreiserfsck --rebuild-tree\fR, please make a backup of 
the whole partition before proceeding. Then run \fBreiserfsck --rebuild-tree 
--logfile rebuild.log /dev/hda1\fR.

6. If the \fBreiserfsck --rebuild-tree\fR step fails or does not recover what 
you expected, please submit this as a bug report. Try to provide as much 
information as possible including your platform and Linux kernel version. We 
will try to help solve the problem.
.SH EXIT CODES
\fBreiserfsck\fR uses the following exit codes:
.br
\   \fI0\fR \-\ No errors.
.br
\   \fI1\fR \-\ File system errors corrected.
.br
\   \fI2\fR \-\ Reboot is needed.
.br
\   \fI4\fR \-\ File system fatal errors left uncorrected,
.br
\	  \fBreiserfsck --rebuild-tree\fR needs to be launched.
.br
\   \fI6\fR \-\ File system fixable errors left uncorrected,
.br
\	  \fBreiserfsck --fix-fixable\fR needs to be launched.
.br
\   \fI8\fR \-\ Operational error.
.br
\   \fI16\fR \-\ Usage or syntax error.
.br
.SH AUTHOR
This version of \fBreiserfsck\fR has been written by Vitaly Fertman <[e-mail]>.
.SH BUGS
Please report bugs to the ReiserFS developers <[e-mail]>, providing 
as much information as possible--your hardware, kernel, patches, settings, all printed 
messages, the logfile; check the syslog file for any related information.
.SH TODO
Faster recovering, signal handling.
.SH SEE ALSO
.BR mkreiserfs (8),
.BR reiserfstune (8)
.BR resize_reiserfs (8),
.BR debugreiserfs (8),