Re: Thoughts on mounting the rootfs from a udev rule

[Harald Hoyer <harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

Victor Lowther wrote:
> It seems that there are two major use cases that make mounting the root
> file system directly from a udev rule an inadvisable design decision:
> 
> The first is when your root filesystem does not reside on a block
> device, as in the nfsroot case.  In this case, there is no backing
> device for the filesystem for udev to detect, so we would still need a
> non-udev method of mounting the root filesystem in order to handle any
> case where there is no backing device for the root filesystem.
> 
> The second is when we are asked to resume from hibernate.  In this case,
> we must not attempt to mount the root filesystem (or any other
> filesystem, for that matter) until we have either attempted to resume
> (and failed) or we have determined that resuming is impossible.  Udev
> does not make any guarantees about the order in which devices are
> discovered, which leads to all sorts of interesting potential failure
> modes when you have either or both of resume handling and rootfs
> handling in a udev rule.
> 
> Thoughts?
> 

You are right.

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