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

To: Ron Yorston <rmy@xxxxxxxxxxxxx>
Subject: Re: sparsify - utility to punch out blocks of 0s in a file
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Sun, 05 Feb 2012 11:21:26 -0600
Cc: xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx
In-reply-to: <201202051719.q15HJJme010040@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <4F2D8F30.3090802@xxxxxxxxxx> <201202050933.q159XQpB026380@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <4F2EB017.5090006@xxxxxxxxxx> <201202051719.q15HJJme010040@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0) Gecko/20120129 Thunderbird/10.0
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.  ;)

-Eric

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

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