Re: [RFC] Hard disk protection revisited

[Jon Escombe <lists@dresco.co.uk>]

Jens Axboe wrote:

> I have to nack this one for now, I still want the generic command types
> patch to go in first. We have far too many queue hooks already, adding
> two more for a relatively obscure use such as this one is not a good
> idea.
>
> My suggestion is to maintain this patch out of tree for now, it will be
> a few kernel release iterations before the command type patch is in.
>  

That's a fair comment (and not entirely unexpected), I don't have a 
problem with looking after this out of tree for now...

One issue with the generic command approach occured to me while making 
this patch - although it's more likely an issue with my understanding ;)

I'm assuming that it would work like this -- the block layer still has 
the sysfs attribute, and queues the new command for the lower driver to 
pick up. The driver receives the command and does it's custom 
park/freeze work, then calls a common block layer function to setup the 
timer (all good so far). Where it gets hazy (for me) is how the block 
layer starts the queue up again - as this ended up needing to be driver 
specific & I can't see how the block layer would get another command 
down if the queue is stopped?

Regards,
Jon.




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