198 lines
4.8 KiB
HTML
198 lines
4.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of DUMPE2FS</TITLE>
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</HEAD><BODY>
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<H1>DUMPE2FS</H1>
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Section: Maintenance Commands (8)<BR>Updated: January 2020<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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dumpe2fs - dump ext2/ext3/ext4 filesystem information
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>dumpe2fs</B>
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[
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<B>-bfghixV</B>
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]
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[
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<B>-o superblock=</B><I>superblock</I>
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]
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[
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<B>-o blocksize=</B><I>blocksize</I>
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]
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<I>device</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>dumpe2fs</B>
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prints the super block and blocks group information for the filesystem
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present on
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<I>device.</I>
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<P>
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<B>Note:</B>
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When used with a mounted filesystem, the printed
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information may be old or inconsistent.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT id="1"><B>-b</B>
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<DD>
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print the blocks which are reserved as bad in the filesystem.
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<DT id="2"><B>-o superblock=</B><I>superblock</I>
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<DD>
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use the block
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<I>superblock</I>
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when examining the filesystem.
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This option is not usually needed except by a filesystem wizard who
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is examining the remains of a very badly corrupted filesystem.
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<DT id="3"><B>-o blocksize=</B><I>blocksize</I>
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<DD>
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use blocks of
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<I>blocksize</I>
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bytes when examining the filesystem.
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This option is not usually needed except by a filesystem wizard who
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is examining the remains of a very badly corrupted filesystem.
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<DT id="4"><B>-f</B>
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<DD>
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force dumpe2fs to display a filesystem even though it may have some
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filesystem feature flags which dumpe2fs may not understand (and which
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can cause some of dumpe2fs's display to be suspect).
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<DT id="5"><B>-g</B>
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<DD>
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display the group descriptor information in a machine readable colon-separated
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value format. The fields displayed are the group number; the number of the
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first block in the group; the superblock location (or -1 if not present); the
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range of blocks used by the group descriptors (or -1 if not present); the block
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bitmap location; the inode bitmap location; and the range of blocks used by the
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inode table.
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<DT id="6"><B>-h</B>
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<DD>
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only display the superblock information and not any of the block
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group descriptor detail information.
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<DT id="7"><B>-i</B>
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<DD>
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display the filesystem data from an image file created by
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<B>e2image</B>,
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using
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<I>device</I>
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as the pathname to the image file.
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<DT id="8"><B>-m</B>
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<DD>
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If the
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<B>mmp</B>
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feature is enabled on the filesystem, check if
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<I>device</I>
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is in use by another node, see
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<B><A HREF="/cgi-bin/man/man2html?8+e2mmpstatus">e2mmpstatus</A></B>(8)
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for full details. If used together with the
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<B>-i</B>
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option, only the MMP block information is printed.
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<DT id="9"><B>-x</B>
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<DD>
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print the detailed group information block numbers in hexadecimal format
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<DT id="10"><B>-V</B>
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<DD>
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print the version number of
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<B>dumpe2fs</B>
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and exit.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>EXIT CODE</H2>
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<B>dumpe2fs</B>
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exits with a return code of 0 if the operation completed without errors.
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It will exit with a non-zero return code if there are any errors, such
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as problems reading a valid superblock, bad checksums, or if the device
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is in use by another node and
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<B>-m</B>
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is specified.
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<A NAME="lbAG"> </A>
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<H2>BUGS</H2>
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You may need to know the physical filesystem structure to understand the
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output.
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<A NAME="lbAH"> </A>
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<H2>AUTHOR</H2>
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<B>dumpe2fs</B>
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was written by Remy Card <<A HREF="mailto:Remy.Card@linux.org">Remy.Card@linux.org</A>>. It is currently being
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maintained by Theodore Ts'o <<A HREF="mailto:tytso@alum.mit.edu">tytso@alum.mit.edu</A>>.
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<A NAME="lbAI"> </A>
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<H2>AVAILABILITY</H2>
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<B>dumpe2fs</B>
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is part of the e2fsprogs package and is available from
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<A HREF="http://e2fsprogs.sourceforge.net.">http://e2fsprogs.sourceforge.net.</A>
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?8+e2fsck">e2fsck</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+e2mmpstatus">e2mmpstatus</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+mke2fs">mke2fs</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+tune2fs">tune2fs</A></B>(8).
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<B><A HREF="/cgi-bin/man/man2html?5+ext4">ext4</A></B>(5)
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<P>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="11"><A HREF="#lbAB">NAME</A><DD>
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<DT id="12"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="13"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="14"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="15"><A HREF="#lbAF">EXIT CODE</A><DD>
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<DT id="16"><A HREF="#lbAG">BUGS</A><DD>
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<DT id="17"><A HREF="#lbAH">AUTHOR</A><DD>
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<DT id="18"><A HREF="#lbAI">AVAILABILITY</A><DD>
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<DT id="19"><A HREF="#lbAJ">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:12 GMT, March 31, 2021
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</BODY>
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</HTML>
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