263 lines
7.9 KiB
Groff
263 lines
7.9 KiB
Groff
.\" $NetBSD: fsck_ext2fs.8,v 1.20 2016/09/11 03:56:00 sevan Exp $
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.\"
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.\" Copyright (c) 1980, 1989, 1991, 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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.\" 3. 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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.\" Copyright (c) 1997 Manuel Bouyer.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" @(#)fsck.8 8.3 (Berkeley) 11/29/94
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.\"
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.Dd September 11, 2016
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.Dt FSCK_EXT2FS 8
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.Os
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.Sh NAME
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.Nm fsck_ext2fs
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.Nd ext2 File System consistency check and interactive repair
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.Sh SYNOPSIS
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.Nm
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.Op Fl dfnpUy
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.Op Fl b Ar block#
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.Op Fl c Ar level
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.Op Fl m Ar mode
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.Ar filesystem ...
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.Sh DESCRIPTION
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.Nm
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performs interactive filesystem consistency checks and repair for each of
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the filesystems specified on the command line.
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It is normally invoked from
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.Xr fsck 8 .
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.Pp
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The kernel takes care that only a restricted class of innocuous filesystem
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inconsistencies can happen unless hardware or software failures intervene.
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These are limited to the following:
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.Pp
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.Bl -item -compact
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.It
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Unreferenced inodes
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.It
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Link counts in inodes too large
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.It
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Missing blocks in the free map
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.It
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Blocks in the free map also in files
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.It
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Counts in the super-block wrong
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.El
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.Pp
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These are the only inconsistencies that
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.Nm
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in
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.Dq preen
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mode (with the
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.Fl p
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option) will correct; if it encounters other inconsistencies, it exits
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with an abnormal return status.
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For each corrected inconsistency one or more lines will be printed
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identifying the filesystem on which the correction will take place,
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and the nature of the correction.
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After successfully correcting a filesystem,
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.Nm
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will print the number of files on that filesystem
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and the number of used and free blocks.
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.Pp
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If sent a
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.Dv QUIT
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signal,
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.Nm
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will finish the filesystem checks, then exit with an abnormal return status.
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.Pp
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Without the
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.Fl p
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option,
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.Nm
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audits and interactively repairs inconsistent conditions for filesystems.
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If the filesystem is inconsistent the operator is prompted for concurrence
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before each correction is attempted.
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It should be noted that some of the corrective actions which are not
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correctable under the
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.Fl p
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option will result in some loss of data.
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The amount and severity of data lost may be determined from the diagnostic
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output.
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The default action for each consistency correction
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is to wait for the operator to respond
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.Li yes
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or
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.Li no .
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If the operator does not have write permission on the filesystem
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.Nm
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will default to a
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.Fl n
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action.
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.Pp
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The following flags are interpreted by
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.Nm .
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.Bl -tag -width indent
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.It Fl b
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Use the block specified immediately after the flag as
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the super block for the filesystem.
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Block 8193 is usually an alternate super block.
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.It Fl d
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Print debugging output.
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.It Fl f
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Force checking of file systems.
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Normally, if a file system is cleanly unmounted, the kernel will set a
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.Dq clean flag
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in the file system superblock, and
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.Nm
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will not check the file system.
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This option forces
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.Nm
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to check the file system, regardless of the state of the clean flag.
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.It Fl m
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Use the mode specified in octal immediately after the flag as the
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permission bits to use when creating the
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.Pa lost+found
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directory rather than the default 1777.
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In particular, systems that do not wish to have lost files accessible
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by all users on the system should use a more restrictive
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set of permissions such as 700.
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.It Fl n
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Assume a no response to all questions asked by
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.Nm
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except for
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.Ql CONTINUE? ,
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which is assumed to be affirmative;
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do not open the filesystem for writing.
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.It Fl p
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Specify
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.Dq preen
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mode, described above.
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.It Fl U
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Resolve numeric userids to usernames.
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.It Fl y
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Assume a yes response to all questions asked by
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.Nm ;
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this should be used with great caution as this is a free license
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to continue after essentially unlimited trouble has been encountered.
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.El
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.Pp
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Inconsistencies checked are as follows:
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.Bl -enum -offset indent -compact
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.It
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Blocks claimed by more than one inode or the free map.
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.It
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Blocks claimed by an inode outside the range of the filesystem.
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.It
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Incorrect link counts.
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.It
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Size checks:
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.Bl -item -offset indent -compact
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.It
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Directory size not a multiple of filesystem block size.
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.It
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Partially truncated file.
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.El
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.It
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Bad inode format.
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.It
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Blocks not accounted for anywhere.
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.It
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Directory checks:
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.Bl -item -offset indent -compact
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.It
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File pointing to unallocated inode.
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.It
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Inode number out of range.
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.It
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Dot or dot-dot not the first two entries of a directory
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or having the wrong inode number.
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.El
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.It
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Super Block checks:
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.Bl -item -offset indent -compact
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.It
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More blocks for inodes than there are in the filesystem.
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.It
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Bad free block map format.
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.It
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Total free block and/or free inode count incorrect.
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.El
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.El
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.Pp
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Orphaned files and directories (allocated but unreferenced) are,
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with the operator's concurrence, reconnected by
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placing them in the
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.Pa lost+found
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directory.
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The name assigned is the inode number.
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If the
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.Pa lost+found
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directory does not exist, it is created.
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If there is insufficient space its size is increased.
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.Pp
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Because of inconsistencies between the block device and the buffer cache,
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the raw device should always be used.
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.Sh DIAGNOSTICS
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The diagnostics produced by
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.Nm
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are fully enumerated and explained in Appendix A of
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.Rs
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.%T "Fsck \- The UNIX File System Check Program"
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.Re
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.Sh SEE ALSO
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.Xr fs 5 ,
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.Xr fstab 5 ,
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.Xr fsck 8 ,
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.Xr fsdb 8 ,
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.Xr newfs 8 ,
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.Xr reboot 8
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.Nx 1.3 .
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.Sh AUTHORS
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.Nm
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was written by
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.An Manuel Bouyer Aq Mt bouyer@NetBSD.org .
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