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Re: Default number of overwrites in shred
From: |
Pádraig Brady |
Subject: |
Re: Default number of overwrites in shred |
Date: |
Sun, 06 May 2007 23:09:01 +0100 |
User-agent: |
Thunderbird 1.5.0.8 (X11/20061116) |
Philip Rowlands wrote:
> On Fri, 4 May 2007, Paul Eggert wrote:
>
>> Anyway, 'shred' currently does the first, but not the second, as it
>> doesn't verify what it's written. That should get fixed, no?
>
> Is there a way to ensure reading directly from disk? On Linux I see only
> a whole-system, root-level way to drop cached files [1].
>
>
> Cheers,
> Phil
>
> [1] http://www.linuxinsight.com/proc_sys_vm_drop_caches.html
We discussed posix_fadvise(POSIX_FADV_DONTNEED) a while back actually:
http://lists.gnu.org/archive/html/bug-coreutils/2007-03/msg00039.html
Currently _on linux_ that will invalidate the cache for a file,
rather than a process. I.E. it currently does what you want.
I.E. if many processes have referenced pages of a file, then they are
still dropped when any process make the above call.
Note I don't think the spec should/does intend this.
A better option I think is to use O_DIRECT, but again
portability is going to be the issue here.
Pádraig.
- Re: Default number of overwrites in shred, (continued)
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/03
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/03
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/04
- Re: Default number of overwrites in shred, Jim Meyering, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04
- Re: Default number of overwrites in shred, Philip Rowlands, 2007/05/05
- Re: Default number of overwrites in shred,
Pádraig Brady <=
- Re: Default number of overwrites in shred, Paul Eggert, 2007/05/08
- Re: Default number of overwrites in shred, John Cowan, 2007/05/04
- Re: Default number of overwrites in shred, Peter Eckersley, 2007/05/04