04-22-2013
Quote:
Originally Posted by
RudiC
I'm afraid you're out of luck:
1) If set up as a swap device, chances are it has been used during install, so data, or, even worse, structural data, have been overwritten.
2) Should some of your old data blocks still reside on disk, it would be extremely difficult if not impossible to put them back to your original files in correct order, esp. as they may well be binary / compressed data.
Thanks RudiC for giving me certainty!
IMPe
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VND(4) BSD Kernel Interfaces Manual VND(4)
NAME
vnd -- vnode disk driver
SYNOPSIS
pseudo-device vnd
options VND_COMPRESSION
DESCRIPTION
The vnd driver provides a disk-like interface to a file. This is useful for a variety of applications, including swap files and building
miniroot or floppy disk images.
This document assumes that you're familiar with how to generate kernels, how to properly configure disks and pseudo-devices in a kernel con-
figuration file.
In order to compile in support for the vnd, you must add a line similar to the following to your kernel configuration file:
pseudo-device vnd # vnode disk driver
To also compile in support for reading compressed disk images, add the following option to your kernel config file:
options VND_COMPRESSION # compressed vnd(4)
Compressed disk images are expected in the cloop2 format, they can be created from "normal" disk images by the vndcompress(1) program.
There is a run-time utility that is used for configuring both compressed and uncompressed vnds. See vnconfig(8) for more information.
FILES
/dev/{,r}vnd* vnd device special files.
SEE ALSO
config(1), vndcompress(1), MAKEDEV(8), fsck(8), mount(8), newfs(8), vnconfig(8)
HISTORY
The vnode disk driver was originally written at the University of Utah. The compression handling is based on code by Cliff Wright
<cliff@snipe444.org>.
BUGS
The vnd driver does not work if the file does not reside in a local filesystem.
The vnd driver does not work if the file is sparse.
BSD
December 18, 2009 BSD