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block: introduce bdev_zone_no helper

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Add a generic bdev_zone_no() helper to calculate zone number for a
given sector in a block device. This helper internally uses disk_zone_no()
to find the zone number.

Use the helper bdev_zone_no() to calculate nr of zones. This lets us
make modifications to the math if needed in one place.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20230110143635.77300-4-p.raghav@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pankaj Raghav 2023-01-10 15:36:35 +01:00 committed by Jens Axboe
parent e29b210021
commit d67ea690ce
2 changed files with 6 additions and 2 deletions
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3
drivers/nvme/target/zns.c
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@ -254,8 +254,7 @@ static unsigned long nvmet_req_nr_zones_from_slba(struct nvmet_req *req)
{
unsigned int sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
return bdev_nr_zones(req->ns->bdev) -
(sect >> ilog2(bdev_zone_sectors(req->ns->bdev)));
return bdev_nr_zones(req->ns->bdev) - bdev_zone_no(req->ns->bdev, sect);
}
static unsigned long get_nr_zones_from_buf(struct nvmet_req *req, u32 bufsize)

5
include/linux/blkdev.h
View File

@ -1288,6 +1288,11 @@ static inline bool bdev_is_zoned(struct block_device *bdev)
return blk_queue_is_zoned(bdev_get_queue(bdev));
}
static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)
{
return disk_zone_no(bdev->bd_disk, sec);
}
static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
blk_opf_t op)
{