[dm-devel] [PATCH] Correctly ignore empty prio names

[Hannes Reinecke]

On 05/08/2013 06:28 PM, Benjamin Marzinski wrote:
> On Wed, May 08, 2013 at 11:13:43AM +0200, Hannes Reinecke wrote:
>> This is a partial revert of commit
>> 'Stop annoying prio_lookup warning messages',
>> as that patch would only fix the 'prio_put' case.
>> However, as the prio name might be empty even in
>> in prio_get() we should rather fix this in
>> prio_lookup() and handle both cases.
> 
> My feeling was that you would want to get that warning message if you
> failed to get the prioritizer in prio_get() because the name was empty.
> With this change it will silently fail unless you have the verbosity set
> to 3, in which case you'll get a message like
> 
> sdb: prio =  (config file default)
> 
> Which doesn't really look that much like an error.
> 
Yeah, one should modify this message.

> On the other hand, if you never got a prioritizer at all, you don't want
> a warning message when you try to free it in prio_put() since that's
> only happening because there is nothing to free.
> 
I'd rather have the functions to do the correct thing.
We've had tons and tons of issues with multipathing just because
no-one ever checked the function arguments.
So we should not be introducing this behaviour again.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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