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fragments in the file system by fragment (block) number. This new mode does the necessary arithmetic to generate absolute fragment numbers rather than than the cg-relative numbers printed in the default mode. If -f is passed once, contiguous fragment ranges are collapsed into an X-Y format as free block lists are currently printed in regular dumpfs output, but if specified twice, all block numbers are printed individually, allowing both compact and more script-friendly representation. This proves quite handy when attempting to recover deleted data, as it allows exclusion of non-deleted data from blocks searched. MFC after: 1 week Discussed with: jeff, Richard Clayton <richard dot clayton at cl.cam.ac.uk> Sponsored by: Google, Inc.
84 lines
2.8 KiB
Groff
84 lines
2.8 KiB
Groff
.\" Copyright (c) 1983, 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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.\" 4. 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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.\" @(#)dumpfs.8 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd January 19, 2003
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.Dt DUMPFS 8
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.Os
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.Sh NAME
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.Nm dumpfs
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.Nd dump file system information
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl m
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.Ar filesys | device
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.Sh DESCRIPTION
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The
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.Nm
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utility prints out the super block and cylinder group information
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for the file system or special device specified, unless the
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.Fl f
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or
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.Fl m
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flag is specified.
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The listing is very long and detailed.
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This
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command is useful mostly for finding out certain file system
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information such as the file system block size and minimum
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free space percentage.
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.Pp
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If
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.Fl f
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is specified, a sorted list of all free fragments and free fragment ranges,
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as represented in cylinder group block free lists, is printed.
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If the flag is specified twice, contiguous free fragments are not collapsed
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into ranges and instead printed in a simple list.
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Fragment numbers may be converted to raw byte offsets by multiplying by the
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fragment size, which may be useful when recovering deleted data.
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.Pp
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If
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.Fl m
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is specified, a
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.Xr newfs 8
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command is printed that can be used to generate a new file system
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with equivalent settings.
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.Sh SEE ALSO
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.Xr disktab 5 ,
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.Xr fs 5 ,
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.Xr disklabel 8 ,
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.Xr fsck 8 ,
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.Xr newfs 8 ,
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.Xr tunefs 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 4.2 .
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