Re: [PATCH] scsi: sd: block: Handle cases where devices come online read-only

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On Fri, Feb 08, 2019 at 06:38:31PM -0500, Martin K. Petersen wrote:
> Some devices come online in write protected state and switch to
> read-write once they are ready to process I/O requests.

That is really weird.  What kind of devices are these?

> Note that per-partition ro settings are lost on revalidate. This has
> been broken for at least a decade and it will require major surgery to
> fix. To my knowledge nobody has complained about being unable to make
> partition read-only settings stick through a revalidate. So hopefully
> this patch will suffice as a simple fix for stable.

Should we warn when we lost these settings on a revalidate?

I have to say I don't like the tristate too much - it seems to allow
setting a hardware write protected device writable again by user
interfaction, right?

Should we just have a hardware and a user policy field that are separate
instead?



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