[dm-devel] dm: dm-zoned: Ignore last smaller runt zone

[Damien Le Moal]

On 10/31/17 11:15, Mike Snitzer wrote:
> On Mon, Oct 30 2017 at  8:48pm -0400,
> Damien Le Moal <damien.lemoal at wdc.com> wrote:
> 
>> Mike,
>>
>> On 10/31/17 05:05, Mike Snitzer wrote:
>>> On Sat, Oct 28 2017 at  3:39am -0400,
>>> Damien Le Moal <damien.lemoal at wdc.com> wrote:
>>>
>>>> The scsi layer allows ZBC drives to have a smaller last runt zone. For
>>>> such device, specifying the entire capacity for a dm-zoned target table
>>>> entry fails as the specified capacity is not aligned on the device zone
>>>> size indicated in the request queue structure of the device.
>>>>
>>>> Fix this problem by ignoring the last runt zone in the entry length
>>>> when seting up the dm-zoned target (ctr method) and when iterating table
>>>> entries of the target (iterate_devices method). This allows dm-zoned
>>>> users to still easily setup a target using the entire device capacity
>>>> (as mandated by dm-zoned) or the aligned capacity excluding thelast runt
>>>> zone.
>>>>
>>>> While at it, replace direct references to the device queue chunk_sectors
>>>> limit with calls to the accessor blk_queue_zone_sectors().
>>>>
>>>> Reported-by: Peter Desnoyers <pjd at ccs.neu.edu>
>>>> Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
>>>
>>> Applied for 3.15 (also cc'd stable@)
>>
>> Thank you. Since this is a bug fix, I was hoping to get this in 4.14 as
>> this is scheduled as an LTS. Is it too late for that ?
> 
> Not opposed to sending another 3.14 pull to Linus but I'd really
> prefer not to (especially in that we're already past rc7).
> 
> Since 3.14 is LTS then there is no concern about 3.14's ability to get
> this fix via stable@ (once it is merged for 3.15).

OK. Thank you.

-- 
Damien Le Moal
Western Digital Research