Ubuntu
libvirt package

Code review comment for ~paelzer/ubuntu/+source/libvirt:lp-1847105-allocation-falloc-instead-metadata-GROOVY

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  2. lp:~paelzer/ubuntu/+source/libvirt
  3. lp-1847105-allocation-falloc-instead-metadata-GROOVY
  4. Merge into ubuntu/groovy-devel
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Richard Laager (rlaager) wrote :

If I'm understanding this correctly, the old approach was to use preallocation=falloc when capacity (size_arg) <= allocation, and now you've made the condition capacity == allocation. So the difference is that previously, if capacity < allocation, it would use falloc but will now use metadata.

Is it possible for capacity to be < allocation? If not, this is irrelevant.

But if it is possible for capacity < allocation, the change seems wrong. If I am overprovisioning, it seems like it would be desirable to use fallocate() to do that. That seems like a weird thing to want to do for a VM disk, but it's not unusual to do in general; fallocate(2) has the FALLOC_FL_KEEP_SIZE specifically for that mode.

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