Re: [Q] In sg_io_v4 what to use as flag for "queue at_head"

[Boaz Harrosh <bharrosh@panasas.com>]

Douglas Gilbert wrote:
> 
> or (adding "_TA_" for task attribute):
>    enum {
>          BSG_TA_DEFAULT = 0,  // lk 2.4, 2.6 series: head of queue
>          BSG_TA_HEAD_OF_Q = 0x1000,
>          BSG_TA_SIMPLE,
>          BSG_TA_ORDERED,
>          BSG_TA_ACA,
>          ....

BSG_TA_HEAD_OF_Q I understand that's like today. What are the meaning
of the other values? Anyway I only have 2 values to implement I don't want
to add more values then I use, and have to comment NOT SUPPORTED next
to them. When used I can add them later.

Please Note that I was asking about the at_head=0/1 of the blk_execute_rq_xxx
calls. This means that it is not transport specific at all, it is a Boolean behavior
common to all transports, governed by the request submission layer.
If task_attribute is something related to SAM-4 then surly that is not it, because
I'm looking for a flag that is independent of scsi. If later I will need that SAM-4
thing it will be taken.

> 
> I would prefer using the request_attr field.
> 
> Tomo, what do you think?
> 
> 
> Doug Gilbert

And please, you never explained, what is "request_priority" for?
What was your original intention?

Thanks
Boaz