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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/fs/xfs/mrlock.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/fs/xfs/mrlock.h')
-rw-r--r--kernel/fs/xfs/mrlock.h90
1 files changed, 90 insertions, 0 deletions
diff --git a/kernel/fs/xfs/mrlock.h b/kernel/fs/xfs/mrlock.h
new file mode 100644
index 000000000..e3c92d19e
--- /dev/null
+++ b/kernel/fs/xfs/mrlock.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef __XFS_SUPPORT_MRLOCK_H__
+#define __XFS_SUPPORT_MRLOCK_H__
+
+#include <linux/rwsem.h>
+
+typedef struct {
+ struct rw_semaphore mr_lock;
+#if defined(DEBUG) || defined(XFS_WARN)
+ int mr_writer;
+#endif
+} mrlock_t;
+
+#if defined(DEBUG) || defined(XFS_WARN)
+#define mrinit(mrp, name) \
+ do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
+#else
+#define mrinit(mrp, name) \
+ do { init_rwsem(&(mrp)->mr_lock); } while (0)
+#endif
+
+#define mrlock_init(mrp, t,n,s) mrinit(mrp, n)
+#define mrfree(mrp) do { } while (0)
+
+static inline void mraccess_nested(mrlock_t *mrp, int subclass)
+{
+ down_read_nested(&mrp->mr_lock, subclass);
+}
+
+static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
+{
+ down_write_nested(&mrp->mr_lock, subclass);
+#if defined(DEBUG) || defined(XFS_WARN)
+ mrp->mr_writer = 1;
+#endif
+}
+
+static inline int mrtryaccess(mrlock_t *mrp)
+{
+ return down_read_trylock(&mrp->mr_lock);
+}
+
+static inline int mrtryupdate(mrlock_t *mrp)
+{
+ if (!down_write_trylock(&mrp->mr_lock))
+ return 0;
+#if defined(DEBUG) || defined(XFS_WARN)
+ mrp->mr_writer = 1;
+#endif
+ return 1;
+}
+
+static inline void mrunlock_excl(mrlock_t *mrp)
+{
+#if defined(DEBUG) || defined(XFS_WARN)
+ mrp->mr_writer = 0;
+#endif
+ up_write(&mrp->mr_lock);
+}
+
+static inline void mrunlock_shared(mrlock_t *mrp)
+{
+ up_read(&mrp->mr_lock);
+}
+
+static inline void mrdemote(mrlock_t *mrp)
+{
+#if defined(DEBUG) || defined(XFS_WARN)
+ mrp->mr_writer = 0;
+#endif
+ downgrade_write(&mrp->mr_lock);
+}
+
+#endif /* __XFS_SUPPORT_MRLOCK_H__ */