From f76713837e9a125ce33780a002c21b9b75f9ba4a Mon Sep 17 00:00:00 2001
From: Maciej Szwed <maciej.szwed@intel.com>
Date: Fri, 13 Dec 2019 12:43:44 +0100
Subject: [PATCH] nvme: Add spdk_nvme_ns_supports_compare function

This function returns information if compare
operation is supported by device.

Signed-off-by: Maciej Szwed <maciej.szwed@intel.com>
Change-Id: I321e9bf6d146ac8d14ea4549cb4380735b30be6f

Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/477925
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
---
 include/spdk/nvme.h | 12 ++++++++++++
 lib/nvme/nvme_ns.c  |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/include/spdk/nvme.h b/include/spdk/nvme.h
index 1180e7fdc..bd4c56c5b 100644
--- a/include/spdk/nvme.h
+++ b/include/spdk/nvme.h
@@ -1889,6 +1889,18 @@ uint32_t spdk_nvme_ns_get_md_size(struct spdk_nvme_ns *ns);
  */
 bool spdk_nvme_ns_supports_extended_lba(struct spdk_nvme_ns *ns);
 
+/**
+ * Check whether if the namespace supports compare operation
+ *
+ * This function is thread safe and can be called at any point while the controller
+ * is attached to the SPDK NVMe driver.
+ *
+ * \param ns Namespace to query.
+ *
+ * \return true if the namespace supports compare operation, or false otherwise.
+ */
+bool spdk_nvme_ns_supports_compare(struct spdk_nvme_ns *ns);
+
 /**
  * Determine the value returned when reading deallocated blocks.
  *
diff --git a/lib/nvme/nvme_ns.c b/lib/nvme/nvme_ns.c
index 095f0829a..01ce80b32 100644
--- a/lib/nvme/nvme_ns.c
+++ b/lib/nvme/nvme_ns.c
@@ -250,6 +250,12 @@ spdk_nvme_ns_supports_extended_lba(struct spdk_nvme_ns *ns)
 	return (ns->flags & SPDK_NVME_NS_EXTENDED_LBA_SUPPORTED) ? true : false;
 }
 
+bool
+spdk_nvme_ns_supports_compare(struct spdk_nvme_ns *ns)
+{
+	return (ns->flags & SPDK_NVME_NS_COMPARE_SUPPORTED) ? true : false;
+}
+
 uint32_t
 spdk_nvme_ns_get_md_size(struct spdk_nvme_ns *ns)
 {