RE: Question: request tag usage

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> -----Original Message-----
> From: Hannes Reinecke [mailto:hare@xxxxxxx]
> Sent: Friday, September 26, 2014 3:21 AM
> To: Christoph Hellwig
> Cc: Elliott, Robert (Server Storage); SCSI Mailing List; Jens Axboe
> Subject: Re: Question: request tag usage
> 
> On 09/26/2014 10:03 AM, Christoph Hellwig wrote:
...
> >
> > I guess for now we'll need to stay with the command pointer address.
> > We can revisit this once the old request layer is gone.
> >
> Too bad. The tags would have provided a really nice concise way
> of identifying the command...

I would still go ahead and print the tag; it's extremely useful for
blk-mq.

How about having scmd_printk do this?
* if tag is -1, print "scmd %p"
* else print "tag %d"

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