sparsify - utility to punch out blocks of 0s in a file
sandeen at redhat.com
Sun Feb 5 11:21:26 CST 2012
On 2/5/12 11:19 AM, Ron Yorston wrote:
> OK, I tried it out for my use case of flinging VM filesystem images around
> on ext4 and it seems to do the job. I don't have any 64-bit systems
> here at home so I used my feeble 32-bit netbook. Since sizeof(off_t) !=
> sizeof(long long) the debug output was all wrong:
> punching at 8989607068975104 len -4635819229210214401
whoops, I'll fix that thanks.
This is the problem when I start something as a hack and then expose it
to the light of day. ;)
> but the image file and the host filesystem both survived the ordeal.
More information about the xfs