Re: USB: on suspend to ram/disk all usb devices are replugged

Pavel Machek
2007-04-06T14:20:33Z

Hi!

> > But you're still likely to run into trouble if you unplug a storage
> > device, move it to another system and write on it, then plug it back into
> > the original system. The PLVM would somehow have to recognize that the
> > data had been changed. I don't know a foolproof way of doing that.
> >
>
> Mark the filesystem as in-use with a one-time UUID in the superblock at
> mount time. If one moved the drive to another system it would require
> an fsck to clear the UUID before the other system could use it; then
> the original machine would refuse to use the drive when the UUID didn't
> match on resume.

You still need fs-specific code, I'm afraid... plus userland tool
to reset signatures back.

Patches welcome.
Pavel
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