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
