linux-kernel - Re: [patch,v2 05/10] sd: use alloc_disk

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Date:	Mon, 05 Nov 2012 23:32:35 +0800
From:	taco <tacoee@...il.com>
To:	Bart Van Assche <bvanassche@....org>
CC:	Jeff Moyer <jmoyer@...hat.com>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...allels.com>
Subject: Re: [patch,v2 05/10] sd: use alloc_disk_node

On 11/05/2012 10:57 PM, Bart Van Assche wrote:
> On 11/05/12 15:12, Jeff Moyer wrote:
>> Bart Van Assche <bvanassche@....org> writes:
>>
>>> On 11/02/12 22:45, Jeff Moyer wrote:
>>>> Signed-off-by: Jeff Moyer <jmoyer@...hat.com>
>>>> ---
>>>>    drivers/scsi/sd.c |    2 +-
>>>>    1 files changed, 1 insertions(+), 1 deletions(-)
>>>>
>>>> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
>>>> index 12f6fdf..8deb915 100644
>>>> --- a/drivers/scsi/sd.c
>>>> +++ b/drivers/scsi/sd.c
>>>> @@ -2714,7 +2714,7 @@ static int sd_probe(struct device *dev)
>>>>        if (!sdkp)
>>>>            goto out;
>>>>
>>>> -    gd = alloc_disk(SD_MINORS);
>>>> +    gd = alloc_disk_node(SD_MINORS, dev_to_node(dev));
>>>>        if (!gd)
>>>>            goto out_free;
>>>
>>> shost->numa_node can be another NUMA node than dev_to_node(dev). Have
>>> you considered using shost->numa_node here ?
>>
>> It can?  How?
>
> E.g. if the LLD allows the user to specify the value of numa_node and 
> passes that value to scsi_host_alloc_node() (see also 
> http://lkml.org/lkml/2012/10/23/477 for further information).
>
>> Just so I'm clear, you're suggesting I use the scsi_device's host
>> pointer to get to the Scsi_Host, and that *will* be filled in that this
>> point, right?
>
> As far as I can see the sdev->host pointer is set in scsi_alloc_sdev() 
> and that happens before sd_probe() is invoked.
>
yes, struct scsi_device was created before sd, sd is the top layer.
> Bart.
>
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