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Message-ID: <abcd72470608050055w51f2bfbcrbd26b59fc32dc494@mail.gmail.com> Date: Sat, 5 Aug 2006 00:55:47 -0700 From: "Avinash Ramanath" <avinashr@...il.com> To: arjan@...radead.org Cc: kernelnewbies@...linux.org, linux-kernel@...r.kernel.org Subject: Re: Zeroing data blocks 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@...radead.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... > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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