85 lines
1.9 KiB
Groff
85 lines
1.9 KiB
Groff
.\" -*- nroff -*-
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.\" Copyright 2008 by Theodore Ts'o. All Rights Reserved.
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.\" This file may be copied under the terms of the GNU Public License.
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.\"
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.TH E2UNDO 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
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.SH NAME
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e2undo \- Replay an undo log for an ext2/ext3/ext4 file system
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.SH SYNOPSIS
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.B e2undo
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[
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.B \-f
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]
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[
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.B \-h
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]
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[
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.B \-n
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]
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[
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.B \-o
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.I offset
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]
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[
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.B \-v
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]
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[
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.B \-z
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.I undo_file
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]
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.I undo_log device
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.SH DESCRIPTION
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.B e2undo
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will replay the undo log
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.I undo_log
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for an ext2/ext3/ext4 file system found on
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.IR device .
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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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.SH OPTIONS
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.TP
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.B \-f
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Normally,
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.B e2undo
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will check the file system superblock to make sure the undo log matches
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with the file system on the device. If they do not match,
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.B e2undo
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will refuse to apply the undo log as a safety mechanism. The
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.B \-f
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option disables this safety mechanism.
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.TP
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.B \-h
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Display a usage message.
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.TP
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.B \-n
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Dry-run; do not actually write blocks back to the file system.
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.TP
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.BI \-o " offset"
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Specify the file system's
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.I offset
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(in bytes) from the beginning of the device or file.
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.TP
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.B \-v
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Report which block we're currently replaying.
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.TP
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.BI \-z " undo_file"
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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 e2undo(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-\fIdevice\fR.e2undo in the directory specified via the
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\fIE2FSPROGS_UNDO_DIR\fR environment variable.
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WARNING: The undo file cannot be used to recover from a power or system crash.
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.SH AUTHOR
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.B e2undo
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was written by Aneesh Kumar K.V. (aneesh.kumar@linux.vnet.ibm.com)
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.SH AVAILABILITY
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.B e2undo
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is part of the e2fsprogs package and is available from
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http://e2fsprogs.sourceforge.net.
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.SH SEE ALSO
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.BR mke2fs (8),
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.BR tune2fs (8)
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