Re: [libvirt] [PATCH] virStorageVolWipe: Document that wiping journaled FS is useless
On 18.12.2015 20:30, John Ferlan wrote:
On 12/17/2015 05:10 AM, Michal Privoznik wrote:
> So you have a libvirt volume that you want to wipe out. But lets
> say that the volume is actually a file stored on a journaled
> filesystem. Overwriting it with zeroes or a pattern does not mean
> that corresponding physical location on the disk is overwritten
> too, due to journaling. It's the same story with network based
> volumes, copy-on-write filesystems, and so on. Since there is no
> way that an userland application can write onto specific areas on
> disk, all that we can do is document the fact.
>
> Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
> ---
> src/libvirt-storage.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
Seems reasonable. Is there an associated bz?
None that I know of. It's just that I've came across some discussion in
the office about volWipe and it just appeared to me that we ought to
have this documented.
Michal