On 2019/11/13 11:16, Jens Axboe wrote: > On 11/10/19 6:39 PM, Damien Le Moal wrote: >> This series of patches introduces changes to zoned block device handling >> code with the intent to simplify the code while optimizing run-time >> operation, particularly in the area of zone reporting. >> >> The first patch lifts the device zone check code out of the sd driver >> and reimplements these zone checks generically as part of >> blk_revalidate_disk_zones(). This avoids zoned block device drivers to >> have to implement these checks. The second patch simplifies this >> function code for the !zoned case. >> >> The third patch is a small cleanup of zone report processing in >> preparation for the fourth patch which removes support for partitions >> on zoned block devices. As mentioned in that patch commit message, none >> of the known partitioning tools support zoned devices and there are no >> known use case in the field of SMR disks being used with partitions. >> Dropping partition supports allows to significantly simplify the code >> for zone report as zone sector values remapping becomes unnecessary. >> >> Patch 5 to 6 are small cleanups and fixes of the null_blk driver zoned >> mode. >> >> The prep patch 7 optimizes zone report buffer allocation for the SCSI >> sd driver. Finally, patch 8 introduces a new interface for report zones >> handling using a callback function executed per zone reported by the >> device. This allows avoiding the need to allocate large arrays of >> blk_zone structures for the execution of zone reports. This can >> significantly reduce memory usage and pressure on the memory management >> system while significantly simplify the code all over. >> >> Overall, this series not only reduces significantly the code size, it >> also improves run-time memory usage for zone report execution. >> >> This series applies cleanly on the for-next block tree on top of the >> zone management operation series. It may however create a conflict with >> Christoph's reqork of disk size revalidation. Please consider this >> series for inclusion in the 5.5 kernel. > > We're taking branching to new levels... I created for-5.5/zoned for this, > which is for-5.5/block + for-5.5/drivers + for-5.5/drivers-post combined. > The latter is a branch with the SCSI dependencies from Martin pulled in. > Jens, Thanks ! -- Damien Le Moal Western Digital Research
