From 1b23560fcd64801be5528a2fedd5588a033f5c45 Mon Sep 17 00:00:00 2001
From: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Date: Fri, 10 Jan 2020 05:30:08 -0500
Subject: [PATCH] lib/blob: add _spdk_bs_cluster_to_extent_page() for easy
 conversion

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: I3e49c398d9bdf9f4eacba65061cc7fe4b300fb56
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/479963
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
---
 lib/blob/blobstore.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/lib/blob/blobstore.h b/lib/blob/blobstore.h
index dc738e454..73107ab30 100644
--- a/lib/blob/blobstore.h
+++ b/lib/blob/blobstore.h
@@ -518,6 +518,24 @@ _spdk_bs_back_dev_lba_to_io_unit(struct spdk_blob *blob, uint64_t lba)
 	return lba * (blob->back_bs_dev->blocklen / blob->bs->io_unit_size);
 }
 
+static inline uint64_t
+_spdk_bs_cluster_to_extent_table_id(uint64_t cluster_num)
+{
+	return cluster_num / SPDK_EXTENTS_PER_EP;
+}
+
+static inline uint32_t *
+_spdk_bs_cluster_to_extent_page(struct spdk_blob *blob, uint64_t cluster_num)
+{
+	uint64_t extent_table_id = _spdk_bs_cluster_to_extent_table_id(cluster_num);
+
+	if (extent_table_id >= blob->active.extent_pages_array_size) {
+		return NULL;
+	}
+
+	return &blob->active.extent_pages[extent_table_id];
+}
+
 /* End basic conversions */
 
 static inline uint64_t