Merge branch 'maint' into next

[tools/e2fsprogs.git] / misc / e2undo.8.in

diff --git a/misc/e2undo.8.in b/misc/e2undo.8.in
index 1b7dee3..d8265b1 100644 (file)
--- a/misc/e2undo.8.in
+++ b/misc/e2undo.8.in
@@ -17,8 +17,16 @@ e2undo \- Replay an undo log for an ext2/ext3/ext4 filesystem
 .B \-n
 ]
 [
+.B \-o
+.I offset
+]
+[
 .B \-v
 ]
+[
+.B \-z
+.I undo_file
+]
 .I undo_log device
 .SH DESCRIPTION
 .B e2undo
@@ -46,8 +54,23 @@ Display a usage message.
 .B \-n
 Dry-run; do not actually write blocks back to the filesystem.
 .TP
+.BI \-o " offset"
+Specify the filesystem's
+.I offset
+(in bytes) from the beginning of the device or file.
+.TP
 .B \-v
 Report which block we're currently replaying.
+.TP
+.BI \-z " undo_file"
+Before overwriting a file system block, write the old contents of the block to
+an undo file.  This undo file can be used with e2undo(8) to restore the old
+contents of the file system should something go wrong.  If the empty string is
+passed as the undo_file argument, the undo file will be written to a file named
+e2undo-\fIdevice\fR.e2undo in the directory specified via the
+\fIE2FSPROGS_UNDO_DIR\fR environment variable.
+
+WARNING: The undo file cannot be used to recover from a power or system crash.
 .SH AUTHOR
 .B e2undo
 was written by Aneesh Kumar K.V. (aneesh.kumar@linux.vnet.ibm.com)