projects / thirdparty / e2fsprogs.git / blame
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1 | .\" -*- nroff -*- |
| 2 | .\" Copyright 2008 by Theodore Ts'o. All Rights Reserved. | |
| 3 | .\" This file may be copied under the terms of the GNU Public License. | |
| 4 | .\" | |
| 5 | .TH E2UNDO 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@" | |
| 6 | .SH NAME | |
| 7 | e2undo \- Replay an undo log for an ext2/ext3/ext4 filesystem | |
| 8 | .SH SYNOPSIS | |
| 9 | .B e2undo | |
| 10 | [ | |
| 11 | .B \-f | |
| 12 | ] | |
| 4892bce3 | 13 | [ |
| bc8f1ae5 TT |
14 | .B \-h |
| 15 | ] | |
| 16 | [ | |
| 4892bce3 DW |
17 | .B \-n |
| 18 | ] | |
| 19 | [ | |
| 75dd3c47 TN |
20 | .B \-o |
| 21 | .I offset | |
| 22 | ] | |
| 23 | [ | |
| 4892bce3 DW |
24 | .B \-v |
| 25 | ] | |
| 75dd3c47 TN |
26 | [ |
| 27 | .B \-z | |
| 28 | .I undo_file | |
| 29 | ] | |
| 5f8a5ae6 AK |
30 | .I undo_log device |
| 31 | .SH DESCRIPTION | |
| 32 | .B e2undo | |
| 33 | will replay the undo log | |
| 34 | .I undo_log | |
| 35 | for an ext2/ext3/ext4 filesystem found on | |
| 36 | .IR device . | |
| 37 | This can be | |
| 38 | used to undo a failed operation by an e2fsprogs program. | |
| 39 | .SH OPTIONS | |
| 40 | .TP | |
| 41 | .B \-f | |
| 42 | Normally, | |
| 43 | .B e2undo | |
| 4892bce3 DW |
44 | will check the filesystem superblock to make sure the undo log matches |
| 45 | with the filesystem on the device. If they do not match, | |
| 5f8a5ae6 AK |
46 | .B e2undo |
| 47 | will refuse to apply the undo log as a safety mechanism. The | |
| 48 | .B \-f | |
| 49 | option disables this safety mechanism. | |
| 4892bce3 | 50 | .TP |
| bc8f1ae5 TT |
51 | .B \-h |
| 52 | Display a usage message. | |
| 53 | .TP | |
| 4892bce3 DW |
54 | .B \-n |
| 55 | Dry-run; do not actually write blocks back to the filesystem. | |
| 56 | .TP | |
| 6930537d MH |
57 | .BI \-o " offset" |
| 58 | Specify the filesystem's | |
| 59 | .I offset | |
| 60 | (in bytes) from the beginning of the device or file. | |
| 61 | .TP | |
| 4892bce3 DW |
62 | .B \-v |
| 63 | Report which block we're currently replaying. | |
| 75dd3c47 TN |
64 | .TP |
| 65 | .BI \-z " undo_file" | |
| 66 | Before overwriting a file system block, write the old contents of the block to | |
| 67 | an undo file. This undo file can be used with e2undo(8) to restore the old | |
| 68 | contents of the file system should something go wrong. If the empty string is | |
| 69 | passed as the undo_file argument, the undo file will be written to a file named | |
| 70 | e2undo-\fIdevice\fR.e2undo in the directory specified via the | |
| 71 | \fIE2FSPROGS_UNDO_DIR\fR environment variable. | |
| 72 | ||
| 73 | WARNING: The undo file cannot be used to recover from a power or system crash. | |
| 5f8a5ae6 AK |
74 | .SH AUTHOR |
| 75 | .B e2undo | |
| 76 | was written by Aneesh Kumar K.V. (aneesh.kumar@linux.vnet.ibm.com) | |
| 77 | .SH AVAILABILITY | |
| 78 | .B e2undo | |
| 79 | is part of the e2fsprogs package and is available from | |
| 80 | http://e2fsprogs.sourceforge.net. | |
| 81 | .SH SEE ALSO | |
| 82 | .BR mke2fs (8), | |
| 83 | .BR tune2fs (8) | |
| 84 |