From e563e6a7c55e65c554e07db6215f8bcb2d411d3b Mon Sep 17 00:00:00 2001

From: Vishal Verma <vishal.l.verma@intel.com>

Date: Tue, 30 Mar 2021 20:50:37 -0600

Subject: [PATCH 015/217] libdaxctl: add an API to check if a device is active

Add an API to check whether a daxctl device is active in system-ram

mode. This would be used from libndctl during

ndctl_namespace_disable_safe(), so that we don't disable/destroy an

underlying namespace while the memory is active and online.

Reported-by: Chunye Xu <chunye.xu@intel.com>

Cc: Dan Williams <dan.j.williams@intel.com>

Cc: Dave Hansen <dave.hansen@linux.intel.com>

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

---

 daxctl/lib/libdaxctl.c   | 10 ++++++++++

 daxctl/lib/libdaxctl.sym |  1 +

 daxctl/libdaxctl.h       |  1 +

 3 files changed, 12 insertions(+)

diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c

index 879f7e6..860bd9c 100644

--- a/daxctl/lib/libdaxctl.c

+++ b/daxctl/lib/libdaxctl.c

@@ -1665,3 +1665,13 @@ DAXCTL_EXPORT int daxctl_dev_will_auto_online_memory(struct daxctl_dev *dev)

 	/* match both "online" and "online_movable" */

 	return !strncmp(buf, "online", 6);

 }

+

+DAXCTL_EXPORT int daxctl_dev_has_online_memory(struct daxctl_dev *dev)

+{

+	struct daxctl_memory *mem = daxctl_dev_get_memory(dev);

+

+	if (mem)

+		return daxctl_memory_is_online(mem);

+	else

+		return 0;

+}

diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym

index 892e393..a13e93d 100644

--- a/daxctl/lib/libdaxctl.sym

+++ b/daxctl/lib/libdaxctl.sym

@@ -95,4 +95,5 @@ global:

 LIBDAXCTL_9 {

 global:

 	daxctl_dev_will_auto_online_memory;

+	daxctl_dev_has_online_memory;

 } LIBDAXCTL_8;

diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h

index 30ab51a..683ae9c 100644

--- a/daxctl/libdaxctl.h

+++ b/daxctl/libdaxctl.h

@@ -72,6 +72,7 @@ int daxctl_dev_enable_devdax(struct daxctl_dev *dev);

 int daxctl_dev_enable_ram(struct daxctl_dev *dev);

 int daxctl_dev_get_target_node(struct daxctl_dev *dev);

 int daxctl_dev_will_auto_online_memory(struct daxctl_dev *dev);

+int daxctl_dev_has_online_memory(struct daxctl_dev *dev);

 struct daxctl_memory;

 struct daxctl_memory *daxctl_dev_get_memory(struct daxctl_dev *dev);

-- 

2.27.0