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

[Mike Snitzer]

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).

Mike