> Thought about that and querying power state before doing shutdown
> sequence but things get somewhat ugly because shutdown sequence is
> driven from sd->shutdown(). We'll have to snoop both sync and shutdown
> commands and check whether the system is shutting down. Also, I felt
> very uneasy about faking successful completion to SYNCHRONIZE_CACHE.
If you see a synchronize cache succeed and you then see the drive
shutdown succeed then you know that a sync cache can be faked as ok
safely. Any other command in between or after and it doesn't get faked
This seems pretty easy to deal with at command issue.
> I dunno. It's already too late for 2.6.21. I was hoping we could get
> distros to update shutdown utilities in not-too-distant future but I
> have no experience with that. Is that just a wishful thinking?
Probably not, but it will take a year or so and throughout this time
period everyone with the wrong combination of shutdown and kernel (which
will be a lot of people who compile their own kernels) are going to have
problems caused by what is a very obscure piece of libata internal
behaviour they'll never even know about.
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