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authorDamien Le Moal <damien.lemoal@wdc.com>2018-10-12 19:08:43 +0900
committerJens Axboe <axboe@kernel.dk>2018-10-25 11:17:40 -0600
commita91e138022bc29b5d2bbc56b41de3e0db6261e28 (patch)
tree858cb365d8459eed119c9e51371ee25d99d53e2a /block/blk-zoned.c
parent5f832a395859de7191e638e3777ae57f37d46d08 (diff)
downloadlinux-a91e138022bc29b5d2bbc56b41de3e0db6261e28.tar.bz2
block: Introduce blkdev_nr_zones() helper
Introduce the blkdev_nr_zones() helper function to get the total number of zones of a zoned block device. This number is always 0 for a regular block device (q->limits.zoned == BLK_ZONED_NONE case). Replace hard-coded number of zones calculation in dmz_get_zoned_device() with a call to this helper. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-zoned.c')
-rw-r--r--block/blk-zoned.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index c461cf63f1f4..32e377f755d8 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -63,6 +63,33 @@ void __blk_req_zone_write_unlock(struct request *rq)
}
EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
+static inline unsigned int __blkdev_nr_zones(struct request_queue *q,
+ sector_t nr_sectors)
+{
+ unsigned long zone_sectors = blk_queue_zone_sectors(q);
+
+ return (nr_sectors + zone_sectors - 1) >> ilog2(zone_sectors);
+}
+
+/**
+ * blkdev_nr_zones - Get number of zones
+ * @bdev: Target block device
+ *
+ * Description:
+ * Return the total number of zones of a zoned block device.
+ * For a regular block device, the number of zones is always 0.
+ */
+unsigned int blkdev_nr_zones(struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ if (!blk_queue_is_zoned(q))
+ return 0;
+
+ return __blkdev_nr_zones(q, bdev->bd_part->nr_sects);
+}
+EXPORT_SYMBOL_GPL(blkdev_nr_zones);
+
/*
* Check that a zone report belongs to the partition.
* If yes, fix its start sector and write pointer, copy it in the