Am Dienstag 25 September 2007 schrieb Hannes Reinecke:
> Oliver Neukum wrote:
> > Hi,
> >
> > what is the difference between these states? What function should
> > I call to block a device in order to securely flush the caches?
> >
> SDEV_BLOCK blocks _any_ commands from the midlayer; eg. if the LLDD
> is doing some internal recovery.
> SDEV_QUIESCE only blocks 'normal' data commands; others (like control
> commands) can still get through.
>
> So for flushing you should use SDEV_QUIESCE.
Thank you, that's very helpful.
Regards
Oliver
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