NetBSD/sbin/fsck_ffs/fsck_ffs.8

285 lines
8.3 KiB
Groff
Raw Normal View History

.\" $NetBSD: fsck_ffs.8,v 1.21 1998/03/18 17:01:23 bouyer Exp $
.\"
.\" Copyright (c) 1980, 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
1993-03-21 12:45:37 +03:00
.\"
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 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
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)fsck.8 8.3 (Berkeley) 11/29/94
1993-03-22 11:04:00 +03:00
.\"
1994-12-28 03:03:49 +03:00
.Dd November 29, 1994
.Dt FSCK_FFS 8
.Os BSD 4
1993-08-06 00:34:26 +04:00
.Sh NAME
.Nm fsck_ffs
.Nd Fast File System consistency check and interactive repair
1993-08-06 00:34:26 +04:00
.Sh SYNOPSIS
.Nm
.Op Fl B Ar byte order
1993-08-06 00:34:26 +04:00
.Op Fl b Ar block#
.Op Fl c Ar level
.Op Fl d
.Op Fl f
.Op Fl m Ar mode
.Op Fl p
1993-08-06 00:34:26 +04:00
.Op Fl y
.Op Fl n
.Ar filesystem
.Ar ...
1993-08-06 00:34:26 +04:00
.Sh DESCRIPTION
.Nm
performs interactive filesystem consistency checks and repair for each of
the filesystems specified on the command line. It is normally invoked from
.Xr fsck 8 .
1993-08-06 00:34:26 +04:00
.Pp
The kernel takes care that only a restricted class of innocuous filesystem
1993-03-21 12:45:37 +03:00
inconsistencies can happen unless hardware or software failures intervene.
These are limited to the following:
.Pp
.Bl -item -compact
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Unreferenced inodes
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Link counts in inodes too large
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Missing blocks in the free map
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Blocks in the free map also in files
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Counts in the super-block wrong
1993-08-06 00:34:26 +04:00
.El
.Pp
1993-03-21 12:45:37 +03:00
These are the only inconsistencies that
.Nm
in ``preen''
mode (with the
1993-08-06 00:34:26 +04:00
.Fl p
option) will correct; if it encounters other inconsistencies, it exits
with an abnormal return status.
1993-03-21 12:45:37 +03:00
For each corrected inconsistency one or more lines will be printed
identifying the filesystem on which the correction will take place,
and the nature of the correction. After successfully correcting a filesystem,
.Nm
will print the number of files on that filesystem,
1993-03-21 12:45:37 +03:00
the number of used and free blocks,
and the percentage of fragmentation.
1993-08-06 00:34:26 +04:00
.Pp
If sent a
.Dv QUIT
signal,
.Nm
will finish the filesystem checks, then exit with an abnormal return status.
1993-08-06 00:34:26 +04:00
.Pp
1993-03-21 12:45:37 +03:00
Without the
1993-08-06 00:34:26 +04:00
.Fl p
1993-03-21 12:45:37 +03:00
option,
.Nm
audits and interactively repairs inconsistent conditions for filesystems.
If the filesystem is inconsistent the operator is prompted for concurrence
1993-03-21 12:45:37 +03:00
before each correction is attempted.
It should be noted that some of the corrective actions which are not
correctable under the
1993-08-06 00:34:26 +04:00
.Fl p
1993-03-21 12:45:37 +03:00
option will result in some loss of data.
The amount and severity of data lost may be determined from the diagnostic
output.
The default action for each consistency correction
is to wait for the operator to respond
.Li yes
1993-08-06 00:34:26 +04:00
or
.Li no .
If the operator does not have write permission on the filesystem
.Nm
1993-03-21 12:45:37 +03:00
will default to a
1993-08-06 00:34:26 +04:00
.Fl n
action.
.Pp
.Nm
1993-03-21 12:45:37 +03:00
has more consistency checks than
its predecessors
.Em check , dcheck , fcheck ,
1993-08-06 00:34:26 +04:00
and
.Em icheck
1993-03-21 12:45:37 +03:00
combined.
1993-08-06 00:34:26 +04:00
.Pp
1993-03-21 12:45:37 +03:00
The following flags are interpreted by
1997-09-15 05:39:32 +04:00
.Nm "" .
1993-08-06 00:34:26 +04:00
.Bl -tag -width indent
.It Fl B
Convert the filesystem metadatas to the specified byte order if needed.
Valid byte order are `be' and `le'. If
.Nm ""
is interrupted while swapping the metadatas byte order, the filesystem cannot
be recovered.
.Nm ""
will print a message in interractive mode if the filesystem is not in host
byte order.
1993-08-06 00:34:26 +04:00
.It Fl b
1993-03-21 12:45:37 +03:00
Use the block specified immediately after the flag as
the super block for the filesystem. Block 32 is usually
1997-03-08 16:47:08 +03:00
an alternative super block.
1993-08-06 00:34:26 +04:00
.It Fl c
Convert the filesystem to the specified level.
Note that the level of a filesystem can only be raised.
.Bl -tag -width indent
1994-12-28 03:03:49 +03:00
There are currently four levels defined:
.It 0
The filesystem is in the old (static table) format.
.It 1
The filesystem is in the new (dynamic table) format.
.It 2
The filesystem supports 32-bit uid's and gid's,
short symbolic links are stored in the inode,
and directories have an added field showing the file type.
1994-12-28 03:03:49 +03:00
.It 3
If maxcontig is greater than one,
build the free segment maps to aid in finding contiguous sets of blocks.
If maxcontig is equal to one, delete any existing segment maps.
.El
.Pp
1993-03-21 12:45:37 +03:00
In interactive mode,
.Nm
will list the conversion to be made
1993-03-21 12:45:37 +03:00
and ask whether the conversion should be done.
If a negative answer is given,
no further operations are done on the filesystem.
In preen mode,
the conversion is listed and done if
1993-03-21 12:45:37 +03:00
possible without user interaction.
Conversion in preen mode is best used when all the filesystems
1993-03-21 12:45:37 +03:00
are being converted at once.
The format of a filesystem can be determined from the
second line of output from
1993-08-06 00:34:26 +04:00
.Xr dumpfs 8 .
.It Fl d
Print debugging output.
.It Fl f
Force checking of file systems. Normally, if a file system is cleanly
unmounted, the kernel will set a
.Dq clean flag
in the file system superblock, and
.Nm
will not check the file system. This option forces
.Nm
to check the file system, regardless of the state of the clean flag.
.It Fl m
Use the mode specified in octal immediately after the flag as the
permission bits to use when creating the
.Pa lost+found
1997-04-21 15:34:37 +04:00
directory rather than the default 1700.
In particular, systems that do not wish to have lost files accessible
by all users on the system should use a more restrictive
set of permissions such as 700.
.It Fl n
Assume a no response to all questions asked by
.Nm
except for
.Ql CONTINUE? ,
which is assumed to be affirmative;
do not open the filesystem for writing.
.It Fl p
Specify ``preen'' mode, described above.
.It Fl y
Assume a yes response to all questions asked by
1997-09-15 05:39:32 +04:00
.Nm "" ;
this should be used with great caution as this is a free license
to continue after essentially unlimited trouble has been encountered.
.El
1993-08-06 00:34:26 +04:00
.Pp
.Bl -enum -indent indent -compact
1993-03-21 12:45:37 +03:00
Inconsistencies checked are as follows:
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Blocks claimed by more than one inode or the free map.
1993-08-06 00:34:26 +04:00
.It
Blocks claimed by an inode outside the range of the filesystem.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Incorrect link counts.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Size checks:
.Bl -item -indent indent -compact
.It
Directory size not a multiple of DIRBLKSIZ.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Partially truncated file.
1993-08-06 00:34:26 +04:00
.El
.It
1993-03-21 12:45:37 +03:00
Bad inode format.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Blocks not accounted for anywhere.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Directory checks:
.Bl -item -indent indent -compact
.It
1993-03-21 12:45:37 +03:00
File pointing to unallocated inode.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Inode number out of range.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Dot or dot-dot not the first two entries of a directory
or having the wrong inode number.
1993-08-06 00:34:26 +04:00
.El
.It
1993-03-21 12:45:37 +03:00
Super Block checks:
.Bl -item -indent indent -compact
.It
More blocks for inodes than there are in the filesystem.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Bad free block map format.
1993-08-06 00:34:26 +04:00
.It
1993-03-21 12:45:37 +03:00
Total free block and/or free inode count incorrect.
1993-08-06 00:34:26 +04:00
.El
.El
1993-08-06 00:34:26 +04:00
.Pp
1993-03-21 12:45:37 +03:00
Orphaned files and directories (allocated but unreferenced) are,
with the operator's concurrence, reconnected by
placing them in the
1993-08-06 00:34:26 +04:00
.Pa lost+found
1993-03-21 12:45:37 +03:00
directory.
The name assigned is the inode number.
If the
1993-08-06 00:34:26 +04:00
.Pa lost+found
1993-03-21 12:45:37 +03:00
directory does not exist, it is created.
If there is insufficient space its size is increased.
1993-08-06 00:34:26 +04:00
.Pp
1993-03-21 12:45:37 +03:00
Because of inconsistencies between the block device and the buffer cache,
the raw device should always be used.
1993-08-06 00:34:26 +04:00
.Sh DIAGNOSTICS
1993-03-21 12:45:37 +03:00
The diagnostics produced by
.Nm
1993-03-21 12:45:37 +03:00
are fully enumerated and explained in Appendix A of
.Rs
.%T "Fsck \- The UNIX File System Check Program"
.Re
1993-08-06 00:34:26 +04:00
.Sh SEE ALSO
.Xr fstab 5 ,
.Xr fs 5 ,
.Xr fsdb 8 ,
.Xr newfs 8 ,
1996-12-27 08:51:14 +03:00
.Xr reboot 8 ,
.Xr fsck 8