linux-ext4 - Re: sparsify - utility to punch out blocks of 0s in a file

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Date:	Sun, 05 Feb 2012 17:19:19 +0000
From:	Ron Yorston <rmy@...ress.co.uk>
To:	sandeen@...hat.com, rmy@...ress.co.uk
Cc:	xfs@....sgi.com, linux-ext4@...r.kernel.org
Subject: Re: sparsify - utility to punch out blocks of 0s in a file

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

but the image file and the host filesystem both survived the ordeal.

Ron
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