RE: [Qemu-devel] Wipe patch

[ZIGLIO, Frediano, VF-IT]

> 
> ZIGLIO, Frediano, VF-IT wrote:
> > Hi,
> >   well, this is not a definitive patch but it works. The 
> aim is to be
> > able to wipe the disk without allocating entire space. When 
> you wipe a
> > disk the program fill disk with zero bytes so disk image increase to
> > allocate all space. This just patch detect null byte writes 
> and do not
> > write all zero byte clusters.
> > 
> 
> I've been giving this some pretty heavy testing over the last 
> week and can say I've not noticed any 
> negative performance impact or any other adverse side 
> effects, not to mention the speedup when doing 
> re-packing (which I do fairly regularly on both ext3 and ntfs 
> guest filesystems).
> 
> While I'm here does anyone know of a simple program, either 
> dos or linux based for wiping unused 
> space on fat filesystems? The only ones I've found so far 
> have been windows based.
> 
> This patch now conflicts pretty heavily with the new AIO 
> changes it would seem. Further 
> investigation required.
> 
> Ta,
> Brad

Here you are updated patch. Current CVS seems to not compile on my
machine (but this is another problem...)

freddy77

wipe.diff
Description: wipe.diff