From ca46420989e2b4aa106c5398ab5c18c6b1805609 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Thu, 17 May 2007 03:02:00 +0000
Subject: [PATCH] Add dev_drefs() - return the number of references on a cdev_t

---
 sys/kern/kern_device.c | 8 +++++++-
 sys/sys/device.h       | 3 ++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_device.c b/sys/kern/kern_device.c
index 8f2b871c2a..012a51bc6b 100644
--- a/sys/kern/kern_device.c
+++ b/sys/kern/kern_device.c
@@ -27,7 +27,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $DragonFly: src/sys/kern/kern_device.c,v 1.25 2007/05/15 22:44:14 dillon Exp $
+ * $DragonFly: src/sys/kern/kern_device.c,v 1.26 2007/05/17 03:01:59 dillon Exp $
  */
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -300,6 +300,12 @@ dev_dkqfilter(cdev_t dev, struct knote *kn)
  *			DEVICE HELPER FUNCTIONS				*
  ************************************************************************/
 
+int
+dev_drefs(cdev_t dev)
+{
+    return(dev->si_sysref.refcnt);
+}
+
 const char *
 dev_dname(cdev_t dev)
 {
diff --git a/sys/sys/device.h b/sys/sys/device.h
index 2b6f7ecbd9..3b55b746be 100644
--- a/sys/sys/device.h
+++ b/sys/sys/device.h
@@ -31,7 +31,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  * 
- * $DragonFly: src/sys/sys/device.h,v 1.10 2007/05/15 22:44:19 dillon Exp $
+ * $DragonFly: src/sys/sys/device.h,v 1.11 2007/05/17 03:02:00 dillon Exp $
  */
 
 #ifndef _SYS_DEVICE_H_
@@ -292,6 +292,7 @@ int dev_dkqfilter(cdev_t dev, struct knote *kn);
 int dev_dmmap(cdev_t dev, vm_offset_t offset, int nprot);
 int dev_dclone(cdev_t dev);
 
+int dev_drefs(cdev_t dev);
 const char *dev_dname(cdev_t dev);
 int dev_dmaj(cdev_t dev);
 int dev_dflags(cdev_t dev);
-- 
2.41.0