lib/bdev: Added spdk_bdev_is_zoned() to bdev interface

This patch is entry point for extending bdev
interface to support devices with zoned namespace
semantics.

spdk_bdev_is_zoned() will allow user to check if
bdev is zoned bdev.

Change-Id: Id9ea9898d406d1d942bf3081b00ebcb574ac2b5e
Signed-off-by: Wojciech Malikowski <wojciech.malikowski@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/460641
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Maciej Szwed <maciej.szwed@intel.com>

include/spdk/bdev.h

@@ -495,6 +495,14 @@ bool spdk_bdev_is_md_interleaved(const struct spdk_bdev *bdev);
  */
 bool spdk_bdev_is_md_separate(const struct spdk_bdev *bdev);
 
+/**
+ * Checks if bdev supports zoned namespace semantics.
+ *
+ * \param bdev Block device to query.
+ * \return true if device supports zoned namespace sementics.
+ */
+bool spdk_bdev_is_zoned(const struct spdk_bdev *bdev);
+
 /**
  * Get block device data block size.
  *

include/spdk/bdev_module.h

@@ -334,6 +334,11 @@ struct spdk_bdev {
 	 */
 	uint32_t dif_check_flags;
 
+	/**
+	 * Specify whether bdev is zoned device.
+	 */
+	bool zoned;
+
 	/**
 	 * Pointer to the bdev module that registered this bdev.
 	 */

lib/bdev/bdev.c

@@ -2520,6 +2520,12 @@ spdk_bdev_is_md_separate(const struct spdk_bdev *bdev)
 	return (bdev->md_len != 0) && !bdev->md_interleave;
 }
 
+bool
+spdk_bdev_is_zoned(const struct spdk_bdev *bdev)
+{
+	return bdev->zoned;
+}
+
 uint32_t
 spdk_bdev_get_data_block_size(const struct spdk_bdev *bdev)
 {