Re: [PATCH] Don't open same disk twice on OpenFirmware.

[David Miller]

From: David Miller <address@hidden>
Date: Fri, 18 Dec 2009 10:33:13 -0800 (PST)

> From: Vladimir 'φ-coder/phcoder' Serbinenko <address@hidden>
> Date: Fri, 18 Dec 2009 17:17:13 +0100
> 
>> Hello, all. According to David Miller sparc's openboot doesn't support
>> opening same disk twice. So I implemented handle reusage logic. Tested
>> on imac g3
> 
> At a minimum you have to seek to the beginning of the device
> as that is one of the many side effects of openning the
> device.

In fact this proves that your idea can't ever work.
Each openned instance will expect the file offset
pointer to be at different locations.

You can't share open instances, therefore.

We really just have to make sure GRUB never violates
this restriction.