Components relying only on the requeuest_queue structure for managing
and controlling block devices (e.g. I/O schedulers) have a limited
view/knowledged of the device being controlled. For instance, the device
capacity cannot be known easily, which for a zoned block device also
result in the inability to know the number of zones of the device.
Define the structure blk_zoned and include it as the zoned field of a
request queue to allow low level drivers to provide more information
on the device.
Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
---
include/linux/blkdev.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 460294bb0fa5..297e0a2fee31 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -349,6 +349,11 @@ struct queue_limits {
#ifdef CONFIG_BLK_DEV_ZONED
+struct blk_zoned {
+ unsigned int nr_zones;
+ unsigned long *seq_zones;
+};
+
struct blk_zone_report_hdr {
unsigned int nr_zones;
u8 padding[60];
@@ -492,6 +497,10 @@ struct request_queue {
struct blk_integrity integrity;
#endif /* CONFIG_BLK_DEV_INTEGRITY */
+#ifdef CONFIG_BLK_DEV_ZONED
+ struct blk_zoned zoned;
+#endif
+
#ifdef CONFIG_PM
struct device *dev;
int rpm_status;
@@ -785,6 +794,11 @@ static inline unsigned int blk_queue_zone_sectors(struct
request_queue *q)
return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
}
+static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
+{
+ return blk_queue_is_zoned(q) ? q->zoned.nr_zones : 0;
+}
+
static inline bool rq_is_sync(struct request *rq)
{
return op_is_sync(rq->cmd_flags);
@@ -1582,6 +1596,16 @@ static inline unsigned int bdev_zone_sectors(struct
block_device *bdev)
return 0;
}
+static inline unsigned int bdev_nr_zones(struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ if (q)
+ return blk_queue_nr_zones(q);
+
+ return 0;
+}
+
static inline int queue_dma_alignment(struct request_queue *q)
{
return q ? q->dma_alignment : 511;
--
2.13.5
