linux-kernel - Re: [PATCH RFC 04/12] xen-blkfront: pre-allocate pages for requests

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Date:	Wed, 6 Mar 2013 10:17:06 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [PATCH RFC 04/12] xen-blkfront: pre-allocate pages for requests

On 05/03/13 22:53, Konrad Rzeszutek Wilk wrote:
>>>>>>  
>>>>>>  	/* No more gnttab callback work. */
>>>>>>  	gnttab_cancel_free_callback(&info->callback);
>>>>>> @@ -1088,6 +1120,12 @@ again:
>>>>>>  		goto destroy_blkring;
>>>>>>  	}
>>>>>>  
>>>>>> +	/* Allocate memory for grants */
>>>>>> +	err = fill_grant_buffer(info, BLK_RING_SIZE *
>>>>>> +	                              BLKIF_MAX_SEGMENTS_PER_REQUEST);
>>>>>> +	if (err)
>>>>>> +		goto out;
>>>>>
>>>>> That looks to be in the wrong function - talk_to_blkback function is
>>>>> to talk to the blkback. Not do initialization type operations.
>>>>
>>>> Yes, I know it's not the best place to place it. It's here mainly
>>>> because that's the only function that gets called by both driver
>>>> initialization and resume.
>>>>
>>>> Last patch moves this to a more sensible place.
>>>
>>> Lets make it part of this patch from the start. We still have two
>>> months of time before the next merge window opens - so we have
>>> time to make it nice and clean.
>>
>> I'm moving this to blkfront_setup_indirect in a later patch (because
>> this function doesn't yet exist at this point), but I can put it in a
>> more suitable place in this patch.
>>

I will place it in setup_blkring, which is the place where we also init
the sg array and it's called by both init and resume paths.
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