Re: Zeroing data blocks

["Avinash Ramanath" <avinashr@gmail.com>]

Hi,

As per your suggestion, if I write a file with zero bits, it would
remap to other pages, and I might not zero the real pages. So is there
any other way that I can access the pages that a file is using?

On 7/9/06, Arjan van de Ven <arjan@infradead.org> wrote:
> On Sat, 2006-07-08 at 18:56 -0700, Avinash Ramanath wrote:
> > I am trying to zero data blocks whenever an unlink is invoked as part
> > of a secure delete filesystem.
> [
> Hi,
>
> just a question... how secure do you want to be?
> (just asking because zeros might not be the best pattern when protecting
> against government type use :)
I would be using zeroes multiple times followed by random bit patterns.


> > I tried to zero the file by writing a buffer (of file size) with
> > zeroes onto the file.
>
> that's not so nice since there is no guarantee that the filesystem or
> the disk won't remap the data blocks underneath you...
>
>
>