linux-kernel - Re: [PATCH 3/6] block: Create scsi

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Date:   Wed, 23 May 2018 13:52:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Tejun Heo <tj@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>,
        "Manoj N. Kumar" <manoj@...ux.vnet.ibm.com>,
        "Matthew R. Ochs" <mrochs@...ux.vnet.ibm.com>,
        Uma Krishnan <ukrishn@...ux.vnet.ibm.com>,
        linux-block <linux-block@...r.kernel.org>,
        linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] block: Create scsi_sense.h for SCSI and ATAPI

On Wed, May 23, 2018 at 7:31 AM, Jens Axboe <axboe@...nel.dk> wrote:
> On 5/23/18 8:25 AM, Christoph Hellwig wrote:
>> On Wed, May 23, 2018 at 08:13:56AM -0600, Jens Axboe wrote:
>>>> Should I move to code to a new drivers/scsi/scsi_sense.c and add it to
>>>> drivers/scsi/Makefile as:
>>>>
>>>> obj-$(CONFIG_BLK_SCSI_REQUEST)    += scsi_sense.o
>>>>
>>>> Every place I want to use the code is already covered by
>>>> CONFIG_BLK_SCSI_REQUEST, so it seems like I just need to know where to
>>>> put the .c file. :P
>>>
>>> I think this is so much saner than a SCSI select or dependency, so I'll
>>> have to disagree with Martin and Christoph. Just put it in drivers/scsi,
>>> if it's the location they care about.
>>
>> I actually plan to remove CONFIG_BLK_SCSI_REQUEST in a merge window
>> or two.  The only users are scsi and the ide layer, (virtio_blk
>> support has already been accidentally disabled for a while), and getting
>> rid of it allows to to shrink and simply the scsi data structures.
>>
>> But if you want this for now lets keep scsi_sense.c in drivers/scsi
>> but depend on CONFIG_BLK_SCSI_REQUEST, that is easy enough to fix up.
>
> It could be a stand-alone dependency, doesn't have to be BLK_SCSI_REQUEST.
> BLA_SCSI_SENSE or something would do. I don't care too much about that,
> mostly getting rid of the entire stack dependency.

Aaand, I can't do this and leave it in drivers/scsi because of drivers/Makefile:

obj-$(CONFIG_SCSI)              += scsi/

So: this needs to live in block/ just like CONFIG_BLK_SCSI_REQUEST's
scsi_ioctl.c. I will split it into CONFIG_BLK_SCSI_SENSE, but I'll
still need to move the code from drivers/scsi/ to block/. Is this
okay?

-Kees

-- 
Kees Cook
Pixel Security