dev_manager: device_is_usable does not flush

When scanning if device is being usable as PV,
we call STATUS - but this status should not cause
any flushing.
Skip also open_count information as it's not needed.

2 files changed, 9 insertions, 1 deletions

diff --git a/WHATS_NEW b/WHATS_NEW
index 21970a84e..0fa9f50cd 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.150 -
 =================================
+  Avoid using flushing dm status ioctl when checking for usable DM device.
   Check for devices without LVM- uuid prefix only with kernels < 3.X.
   Reuse %FREE size aproximation with lvcreate -l%PVS thin-pool.
   Allow the lvmdump directory to exist already provided it is empty.
diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
index 89fa9e900..f2e382605 100644
--- a/lib/activate/dev_manager.c
+++ b/lib/activate/dev_manager.c
@@ -553,7 +553,14 @@ int device_is_usable(struct device *dev, struct dev_usable_check_params check)
 
 	if (activation_checks() && !dm_task_enable_checks(dmt))
 		goto_out;
-		
+
+	/* Non-blocking status read */
+	if (!dm_task_no_flush(dmt))
+		log_warn("WARNING: Can't set no_flush for dm status.");
+
+	if (!dm_task_no_open_count(dmt))
+		goto_out;
+
 	if (!dm_task_run(dmt)) {
 		log_error("Failed to get state of mapped device");
 		goto out;