On 6/29/23 09:38, Ming Lei wrote:
> On Thu, Jun 29, 2023 at 07:47:47AM +0900, Damien Le Moal wrote:
>> On 6/29/23 04:06, Andreas Hindborg wrote:
>>> From: Andreas Hindborg <a.hindborg@xxxxxxxxxxx>
>>>
>>> This change is in preparation for zoned storage support.
>>>
>>> Signed-off-by: Andreas Hindborg <a.hindborg@xxxxxxxxxxx>
>>> ---
>>> include/uapi/linux/ublk_cmd.h | 23 +++++++++++++++++------
>>> 1 file changed, 17 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h
>>> index 4b8558db90e1..471b3b983045 100644
>>> --- a/include/uapi/linux/ublk_cmd.h
>>> +++ b/include/uapi/linux/ublk_cmd.h
>>> @@ -229,12 +229,23 @@ struct ublksrv_ctrl_dev_info {
>>> __u64 reserved2;
>>> };
>>>
>>> -#define UBLK_IO_OP_READ 0
>>> -#define UBLK_IO_OP_WRITE 1
>>> -#define UBLK_IO_OP_FLUSH 2
>>> -#define UBLK_IO_OP_DISCARD 3
>>> -#define UBLK_IO_OP_WRITE_SAME 4
>>> -#define UBLK_IO_OP_WRITE_ZEROES 5
>>> +enum ublk_op {
>>> + UBLK_IO_OP_READ = 0,
>>> + UBLK_IO_OP_WRITE = 1,
>>> + UBLK_IO_OP_FLUSH = 2,
>>> + UBLK_IO_OP_DISCARD = 3,
>>> + UBLK_IO_OP_WRITE_SAME = 4,
>>> + UBLK_IO_OP_WRITE_ZEROES = 5,
>>> + UBLK_IO_OP_ZONE_OPEN = 10,
>>> + UBLK_IO_OP_ZONE_CLOSE = 11,
>>> + UBLK_IO_OP_ZONE_FINISH = 12,
>>> + UBLK_IO_OP_ZONE_APPEND = 13,
>>> + UBLK_IO_OP_ZONE_RESET = 15,
>>> + __UBLK_IO_OP_DRV_IN_START = 32,
>>> + __UBLK_IO_OP_DRV_IN_END = 96,
>>> + __UBLK_IO_OP_DRV_OUT_START = __UBLK_IO_OP_DRV_IN_END,
>>> + __UBLK_IO_OP_DRV_OUT_END = 160,
>>> +};
>>
>> This patch does not do what the title says. You are also introducing the zone
>> operations, and the very obscure __UBLK_IO_OP_DRV_XXX operations without an
>> explanation. Also, why the "__" prefix for these ? I do not see the point...
>
> It should be to reserve space for ublk passthrough OP.
A comment about that would be nice.
>
>> Given that this is a uapi, a comment to explain the less obvious commands would
>> be nice.
>>
>> So I think the change to an enum for the existing ops can be done either in
>> patch 2 or as a separate patch and the introduction of the zone operations done
>> in patch 3 or as a separate patch.
>
> Also it might break userspace by changing to enum from macro for existed
> definition, cause userspace may check something by '#ifdef UBLK_IO_OP_*',
> so probably it is better to keep these OPs as enum, or at least keep
> existed definition as macro.
Then let's keep defining things with #define instead of an enum.
>
> Thanks,
> Ming
>
--
Damien Le Moal
Western Digital Research
