Re: Device names

["H. Peter Anvin" <hpa@zytor.com>]

On 06/19/2012 04:51 PM, Chris Mason wrote:
> 
> At mount time, we go through and verify the path names still belong to
> the filesystem you thought they belonged to.  The bdev is locked during
> the verification, so it won't be able to go away or change.
> 
> This is a long way of saying right we don't spit out device numbers.
> Even device numbers can change.  We can easily add a uuid based listing,
> which I think is what you want.
> 

No, I want to find the actual devices.  I know I can get the UUID, but
scanning all the block devices in the system looking for that UUID is a
nonstarter.

Device path names can change while the system is operating (and, worse,
are dependent on namespace changes and chroot); device *numbers* cannot
as long as the device is in use (e.g. mounted.)  They can indeed change
while not in use, of course.

	-hpa