Re: [Xen-devel] [PATCH] Support for official xvd major number

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 14 Jul 2005, at 22:35, Jeremy Katz wrote:

> Also, on a side note that is really unrelated to the patch, is there
> really a good reason why these hoops are still gone through instead of
> having the kernel allocate the next disk instead of the hard-coding 
> with
> things somewhat out of order and stealing the major/minors of other
> subsystems?
I'm not sure what you mean? Specifying device numbers up front in a 
config file means that you know e.g., what device names to put in your 
fstab and what to specify as your rootfs device. And stealing scsi/ide 
device names/numbers is the strategy of least surprise to userspace 
tools and scripts (e.g., some vendor init scripts have a baby if 
filesystems are mounted on a weirdly-named block device like xvd<foo>). 
And the xvd* names and numbers are there if you want to avoid clashes 
with other subsystems.
 -- Keir


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