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Re: [libvirt] [PATCH 3/3] Add volume zeroing



On 02/15/2010 10:29 PM, David Allan wrote:
* If the volume is a sparse file and the fiemap ioctl is available,
use fiemap to locate the volume's extents.

What about for a sparse file doing just

  ftruncate (fd, 0);
  ftruncate (fd, st.st_size);

?

It's already sparse, it doesn't hurt to make it _more_ sparse.

Paolo


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