330 lines
9.0 KiB
Groff
330 lines
9.0 KiB
Groff
.\" $OpenBSD: fsck_ffs.8,v 1.28 2022/03/31 17:27:19 naddy Exp $
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.\" $NetBSD: fsck_ffs.8,v 1.12 1996/09/23 16:18:34 christos 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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.\" @(#)fsck.8 8.3 (Berkeley) 11/29/94
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.\"
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.Dd $Mdocdate: March 31 2022 $
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.Dt FSCK_FFS 8
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.Os
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.Sh NAME
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.Nm fsck_ffs
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.Nd Fast File System consistency check and interactive repair
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.Sh SYNOPSIS
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.Nm fsck_ffs
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.Op Fl fnpy
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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 file system consistency checks and repairs the
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file system specified.
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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 file system
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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 -offset indent
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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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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 and an automatic reboot will then fail.
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For each corrected inconsistency, one or more lines will be printed
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identifying the file system on which the correction will take place
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along with the nature of the correction.
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After successfully correcting a file system,
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.Nm
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will print the number of files on that file system,
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the number of used and free blocks,
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and the percentage of fragmentation.
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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 file system checks, then exit with an abnormal
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return status that causes an automatic reboot to fail.
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This is useful when you want to finish the file system checks during an
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automatic reboot,
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but do not want the machine to come up multiuser after the checks complete.
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.Pp
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If sent an
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.Dv INFO
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signal,
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.Nm
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will print a line to standard error indicating the name of the device
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currently being checked, the current phase number, and phase-specific
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progress information.
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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 the filesystem.
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If the file system 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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.Dq yes
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or
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.Dq no .
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If the operator does not have write permission on the file system,
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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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.Nm fsck
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has more consistency checks than
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its predecessors
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.Em check , dcheck , fcheck ,
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and
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.Em icheck
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combined.
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.Pp
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The following flags are interpreted by
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.Nm fsck_ffs :
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.Bl -tag -width indent
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.It Fl b Ar block#
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Use the
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.Ar block#
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specified as
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the super block for the file system.
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If the primary superblock is corrupted,
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.Nm
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tries to find a valid alternate superblock based on the
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information in the disklabel.
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If that fails, a number printed by
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.Nm newfs
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(using
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.Fl N
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combined with the original flags used to create the filesystem)
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can be used as a value to this argument.
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.It Fl c Ar level
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Convert the file system to the specified
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.Ar level .
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Note that the level of a file system can only be raised.
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There are currently four levels defined:
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.Bl -tag -width indent
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.It 0
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The file system is in the old (static table) format.
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.It 1
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The file system is in the new (dynamic table) format.
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.It 2
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The file system supports 32-bit UIDs and GIDs,
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short symbolic links are stored in the inode,
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and directories have an added field showing the file type.
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.It 3
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If
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.Va maxcontig
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is greater than one,
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build the free segment maps to aid in finding contiguous sets of blocks.
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If
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.Va maxcontig
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is equal to one, delete any existing segment maps.
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.El
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.It Fl f
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Force checking of the filesystem.
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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 Ar mode
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Use the
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.Ar mode
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specified in octal 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 1700.
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In particular, systems that wish to have lost files accessible
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by all users on the system should use a less restrictive
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set of permissions such as 755.
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.It Fl n
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Assume a
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.Dq no
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response to all questions asked by
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.Nm
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except for
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.Dq CONTINUE? ,
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which is assumed to be affirmative.
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The filesystem will not be opened for writing.
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This is the default for file systems to be checked that are
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concurrently mounted writable.
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.It Fl p
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Enter preen mode:
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.Nm
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will check the filesystem on the
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special (raw) device listed on the command line
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and will make minor repairs without
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human intervention.
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Any major problems will cause
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.Nm
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to exit with a non-zero exit code,
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so as to alert any invoking program or script
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that human intervention is required.
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.It Fl y
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Assume a
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.Dq yes
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response to all questions asked by
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.Nm fsck_ffs ;
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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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If neither of the
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.Fl y
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or
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.Fl n
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options are specified, the user may force
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.Nm
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to assume an answer of
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.Dq yes
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to all the remaining questions by replying to a question with a value of
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.Dq F .
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.Pp
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In interactive mode,
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.Nm
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will list the conversion to be made
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and ask whether the conversion should be done.
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If a negative answer is given,
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no further operations are done on the file system.
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In preen mode,
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the conversion is listed and done if
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possible without user interaction.
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Conversion in preen mode is best used when all the file systems
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are being converted at once.
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The format of a file system can be determined from the
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first line of output from
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.Xr dumpfs 8 .
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.Pp
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Inconsistencies checked are as follows:
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.Pp
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.Bl -enum -compact
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.It
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Blocks claimed more than once by inodes or the free map.
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.It
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Blocks claimed by an inode outside the range of the file system.
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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 -compact -offset indent
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.It
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Directory size not a multiple of
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.Dv DIRBLKSIZ .
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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 -compact -offset indent
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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 -compact -offset indent
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.It
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More blocks for inodes than there are in the file system.
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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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.\" 4.4BSD SMM:3
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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 growfs 8 ,
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.Xr mount_ffs 8 ,
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.Xr newfs 8 ,
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.Xr rc 8 ,
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.Xr scan_ffs 8
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