151 lines
3.2 KiB
HTML
151 lines
3.2 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 E2UNDO</TITLE>
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</HEAD><BODY>
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<H1>E2UNDO</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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e2undo - Replay an undo log for an ext2/ext3/ext4 filesystem
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>e2undo</B>
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[
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<B>-f</B>
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]
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[
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<B>-h</B>
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]
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[
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<B>-n</B>
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]
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[
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<B>-o</B>
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<I>offset</I>
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]
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[
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<B>-v</B>
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]
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[
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<B>-z</B>
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<I>undo_file</I>
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]
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<I>undo_log device</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>e2undo</B>
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will replay the undo log
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<I>undo_log</I>
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for an ext2/ext3/ext4 filesystem found on
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<I>device</I>.
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This can be
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used to undo a failed operation by an e2fsprogs program.
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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>-f</B>
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<DD>
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Normally,
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<B>e2undo</B>
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will check the filesystem superblock to make sure the undo log matches
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with the filesystem on the device. If they do not match,
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<B>e2undo</B>
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will refuse to apply the undo log as a safety mechanism. The
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<B>-f</B>
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option disables this safety mechanism.
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<DT id="2"><B>-h</B>
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<DD>
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Display a usage message.
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<DT id="3"><B>-n</B>
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<DD>
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Dry-run; do not actually write blocks back to the filesystem.
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<DT id="4"><B>-o</B><I> offset</I>
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<DD>
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Specify the filesystem's
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<I>offset</I>
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(in bytes) from the beginning of the device or file.
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<DT id="5"><B>-v</B>
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<DD>
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Report which block we're currently replaying.
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<DT id="6"><B>-z</B><I> undo_file</I>
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<DD>
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Before overwriting a file system block, write the old contents of the block to
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an undo file. This undo file can be used with <A HREF="/cgi-bin/man/man2html?8+e2undo">e2undo</A>(8) to restore the old
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contents of the file system should something go wrong. If the empty string is
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passed as the undo_file argument, the undo file will be written to a file named
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e2undo-<I>device</I>.e2undo in the directory specified via the
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<I>E2FSPROGS_UNDO_DIR</I> environment variable.
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<P>
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WARNING: The undo file cannot be used to recover from a power or system crash.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>AUTHOR</H2>
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<B>e2undo</B>
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was written by Aneesh Kumar K.V. (<A HREF="mailto:aneesh.kumar@linux.vnet.ibm.com">aneesh.kumar@linux.vnet.ibm.com</A>)
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<A NAME="lbAG"> </A>
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<H2>AVAILABILITY</H2>
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<B>e2undo</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="lbAH"> </A>
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<H2>SEE ALSO</H2>
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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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<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="7"><A HREF="#lbAB">NAME</A><DD>
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<DT id="8"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="9"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="10"><A HREF="#lbAE">OPTIONS</A><DD>
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<DT id="11"><A HREF="#lbAF">AUTHOR</A><DD>
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<DT id="12"><A HREF="#lbAG">AVAILABILITY</A><DD>
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<DT id="13"><A HREF="#lbAH">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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