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@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