RE: driverfs is not for everything! (was: [PATCH] /proc/scsi/map )

From: Roman Zippel (
Date: Mon Jun 24 2002 - 13:32:15 EST


On Mon, 24 Jun 2002, Grover, Andrew wrote:

> With technologies like USB, infiniband, NFS, iSCSI, and 1394, it's tough,
> but the main question should be:
> "If my computer suspends, should this device be turned off?" Which is
> another way of asking is the use of a device exclusive to a particular
> machine.
> If a device can be accessed by multiple machines concurrently, it should not
> be in driverfs.

I don't think it's that easy. If the computer wakes up again, devices have
to be reinitialised in the right order, e.g. iSCSI needs a working network
stack and devices. Another problem is how to properly shutdown the
machine. Scripts now "know" that nfs requires the network, but how does
the script find out, that /dev/sdb2 is an iSCSI device, so that it can
properly unmount the device, before the network is shutdown?

bye, Roman

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