I needed the inverse function to virDiskNameToIndex() for the ESX driver and added it to esx_vmx.c. The pending VirtualBox 3.1 patch needs disk index to disk name mapping too. So I want to move esxVMX_IndexToDiskName() to util.c.
esxVMX_IndexToDiskName() handles indices up to 701. This limit comes from a gap in the disk name to disk index mapping of virDiskNameToIndex():
sdzy -> 700 sdzz -> 701 sdaaa -> 728 sdaab -> 729
This line in virDiskNameToIndex() causes this gap:
idx = (idx + i) * 26;
It can be fixed by altering this line to:
idx = (idx + (i < 1 ? 0 : 1)) * 26;
But this change breaks compatibility for indices > 701.
ACK to patch A. I am not sure if we should go with patch B as it is good to squash bugs and not make them seem like a feature, I guess it is ok to break compatibility if it is real bug like this instead on inventing ways around it. Regards, Pritesh