| To: | sandeen@xxxxxxxxxx, rmy@xxxxxxxxxxxxx |
|---|---|
| Subject: | Re: sparsify - utility to punch out blocks of 0s in a file |
| From: | Ron Yorston <rmy@xxxxxxxxxxxxx> |
| Date: | Sun, 05 Feb 2012 17:19:19 +0000 |
| Cc: | xfs@xxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx |
| In-reply-to: | <4F2EB017.5090006@xxxxxxxxxx> |
| References: | <4F2D8F30.3090802@xxxxxxxxxx> <201202050933.q159XQpB026380@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <4F2EB017.5090006@xxxxxxxxxx> |
| User-agent: | Heirloom mailx 12.3 7/15/07 |
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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