[dm-devel] [PATCH v5 0/7] Elevator cleanups and improvements

[Jens Axboe]

On 9/5/19 3:51 AM, Damien Le Moal wrote:
> This patch series implements some cleanup of the elevator initialization
> code and introduces elevator features identification and device matching
> to enhance checks for elevator/device compatibility and fitness.
> 
> The first 2 patches of the series are simple cleanups which simplify
> elevator initialization for newly allocated device queues.
> 
> Patch 3 introduce elevator features, allowing a clean and extensible
> definition of devices and features that an elevator supports and match
> these against features required by a block device. With this, the sysfs
> elevator list for a device always shows only elevators matching the
> features that a particular device requires, with the exception of the
> none elevator which has no features but is always available for use
> with any device.
> 
> The first feature defined is for zoned block device sequential write
> constraint support through zone write locking which prevents the use of
> any elevator that does not support this feature with zoned devices.
> 
> The last 4 patches of this series rework the default elevator selection
> and initialization to allow for the elevator/device features matching
> to work, doing so addressing cases not currently well supported, namely,
> multi-queue zoned block devices.

Applied for 5.4, thanks.

-- 
Jens Axboe