[Bug 684875] Re: Patch to Natty 2.6.37-virtual breaks non-EC2 users

[Alex Bligh]

Though a compromise solution would be to register as sda only if the
unplug of the original sda device succeeded / is going to be tried.
Otherwise it's just going to cause a kernel bug.

I think xen_unplug_emulated_devices() is called sufficiently early you
could choose the name when the driver is init'ed, so something like the
attached patch (completely untested, may not even compile).

But even so, if you rename the xen block device, you will be running
/dev/sdX with a non-standard block major and block minor number (you are
not changing the block major / minor numbers). I can't help but think
that's a recipe for disaster.


** Patch added: "completely untested illustrative patch for dynamically chosing name of device"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/684875/+attachment/1754610/+files/blkfront.devname.patch

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https://bugs.launchpad.net/bugs/684875

Title:
  Patch to Natty 2.6.37-virtual breaks non-EC2 users