[src/trunk]: src/sys/miscfs/genfs Add genfs_node_rdtrylock().

[uebayasi <uebayasi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d9d3a0474a32
branches:  trunk
changeset: 751188:d9d3a0474a32
user:      uebayasi <uebayasi%NetBSD.org@localhost>
date:      Wed Jan 27 15:18:40 2010 +0000

description:
Add genfs_node_rdtrylock().

diffstat:

 sys/miscfs/genfs/genfs_node.h  |   3 ++-
 sys/miscfs/genfs/genfs_vnops.c |  12 ++++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diffs (50 lines):

diff -r 10e97d844f89 -r d9d3a0474a32 sys/miscfs/genfs/genfs_node.h
--- a/sys/miscfs/genfs/genfs_node.h     Wed Jan 27 14:10:41 2010 +0000
+++ b/sys/miscfs/genfs/genfs_node.h     Wed Jan 27 15:18:40 2010 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: genfs_node.h,v 1.17 2008/05/14 16:49:47 reinoud Exp $ */
+/* $NetBSD: genfs_node.h,v 1.18 2010/01/27 15:18:40 uebayasi Exp $ */
 
 /*
  * Copyright (c) 2001 Chuck Silvers.
@@ -91,6 +91,7 @@
 
 void   genfs_node_wrlock(struct vnode *);
 void   genfs_node_rdlock(struct vnode *);
+void   genfs_node_rdtrylock(struct vnode *);
 void   genfs_node_unlock(struct vnode *);
 
 #endif /* _MISCFS_GENFS_GENFS_NODE_H_ */
diff -r 10e97d844f89 -r d9d3a0474a32 sys/miscfs/genfs/genfs_vnops.c
--- a/sys/miscfs/genfs/genfs_vnops.c    Wed Jan 27 14:10:41 2010 +0000
+++ b/sys/miscfs/genfs/genfs_vnops.c    Wed Jan 27 15:18:40 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: genfs_vnops.c,v 1.174 2009/11/20 13:42:43 roy Exp $    */
+/*     $NetBSD: genfs_vnops.c,v 1.175 2010/01/27 15:18:40 uebayasi Exp $       */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -57,7 +57,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.174 2009/11/20 13:42:43 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: genfs_vnops.c,v 1.175 2010/01/27 15:18:40 uebayasi Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -515,6 +515,14 @@
 }
 
 void
+genfs_node_rdtrylock(struct vnode *vp)
+{
+       struct genfs_node *gp = VTOG(vp);
+
+       rw_tryenter(&gp->g_glock, RW_READER);
+}
+
+void
 genfs_node_unlock(struct vnode *vp)
 {
        struct genfs_node *gp = VTOG(vp);