| Message ID | 20220727162245.209794-2-p.raghav@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | support non power of 2 zoned device | expand |
On 7/28/22 01:22, Pankaj Raghav wrote: > Adapt bdev_nr_zones and disk_zone_no function so that it can s/function/functions s/it/they > also work for non-power-of-2 zone sizes. > > As the existing deployments of zoned devices had power-of-2 had power-of-2 assumption -> assume that a device zone size is a power of 2 number of sectors Existing deployments still exist, so do not use the past tense please. > assumption, power-of-2 optimized calculation is kept for those devices. > > There are no direct hot paths modified and the changes just > introduce one new branch per call. > > Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> > Reviewed-by: Adam Manzanares <a.manzanares@samsung.com> > Reviewed-by: Hannes Reinecke <hare@suse.de> > Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> > Reviewed-by: Bart Van Assche <bvanassche@acm.org> > --- > block/blk-zoned.c | 13 +++++++++---- > include/linux/blkdev.h | 8 +++++++- > 2 files changed, 16 insertions(+), 5 deletions(-) > > diff --git a/block/blk-zoned.c b/block/blk-zoned.c > index a264621d4905..dce9c95b4bcd 100644 > --- a/block/blk-zoned.c > +++ b/block/blk-zoned.c > @@ -111,17 +111,22 @@ EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock); > * bdev_nr_zones - Get number of zones > * @bdev: Target device > * > - * Return the total number of zones of a zoned block device. For a block > - * device without zone capabilities, the number of zones is always 0. > + * Return the total number of zones of a zoned block device, including the > + * eventual small last zone if present. For a block device without zone > + * capabilities, the number of zones is always 0. > */ > unsigned int bdev_nr_zones(struct block_device *bdev) > { > sector_t zone_sectors = bdev_zone_sectors(bdev); > + sector_t capacity = bdev_nr_sectors(bdev); > > if (!bdev_is_zoned(bdev)) > return 0; > - return (bdev_nr_sectors(bdev) + zone_sectors - 1) >> > - ilog2(zone_sectors); > + > + if (is_power_of_2(zone_sectors)) > + return (capacity + zone_sectors - 1) >> ilog2(zone_sectors); > + > + return DIV_ROUND_UP_SECTOR_T(capacity, zone_sectors); > } > EXPORT_SYMBOL_GPL(bdev_nr_zones); > > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h > index dccdf1551c62..85b832908f28 100644 > --- a/include/linux/blkdev.h > +++ b/include/linux/blkdev.h > @@ -673,9 +673,15 @@ static inline unsigned int disk_nr_zones(struct gendisk *disk) > > static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) > { > + sector_t zone_sectors = disk->queue->limits.chunk_sectors; > + > if (!blk_queue_is_zoned(disk->queue)) > return 0; > - return sector >> ilog2(disk->queue->limits.chunk_sectors); > + > + if (is_power_of_2(zone_sectors)) > + return sector >> ilog2(zone_sectors); > + > + return div64_u64(sector, zone_sectors); > } > > static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
diff --git a/block/blk-zoned.c b/block/blk-zoned.c index a264621d4905..dce9c95b4bcd 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -111,17 +111,22 @@ EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock); * bdev_nr_zones - Get number of zones * @bdev: Target device * - * Return the total number of zones of a zoned block device. For a block - * device without zone capabilities, the number of zones is always 0. + * Return the total number of zones of a zoned block device, including the + * eventual small last zone if present. For a block device without zone + * capabilities, the number of zones is always 0. */ unsigned int bdev_nr_zones(struct block_device *bdev) { sector_t zone_sectors = bdev_zone_sectors(bdev); + sector_t capacity = bdev_nr_sectors(bdev); if (!bdev_is_zoned(bdev)) return 0; - return (bdev_nr_sectors(bdev) + zone_sectors - 1) >> - ilog2(zone_sectors); + + if (is_power_of_2(zone_sectors)) + return (capacity + zone_sectors - 1) >> ilog2(zone_sectors); + + return DIV_ROUND_UP_SECTOR_T(capacity, zone_sectors); } EXPORT_SYMBOL_GPL(bdev_nr_zones); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index dccdf1551c62..85b832908f28 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -673,9 +673,15 @@ static inline unsigned int disk_nr_zones(struct gendisk *disk) static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) { + sector_t zone_sectors = disk->queue->limits.chunk_sectors; + if (!blk_queue_is_zoned(disk->queue)) return 0; - return sector >> ilog2(disk->queue->limits.chunk_sectors); + + if (is_power_of_2(zone_sectors)) + return sector >> ilog2(zone_sectors); + + return div64_u64(sector, zone_sectors); } static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)