aufs: add files

[pandora-kernel.git] / fs / aufs / spl.h

diff --git a/fs/aufs/spl.h b/fs/aufs/spl.h
new file mode 100644 (file)
index 0000000..37a0329
--- /dev/null
+++ b/fs/aufs/spl.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2005-2011 Junjiro R. Okajima
+ *
+ * This program, aufs 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will 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 to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*
+ * simple list protected by a spinlock
+ */
+
+#ifndef __AUFS_SPL_H__
+#define __AUFS_SPL_H__
+
+#ifdef __KERNEL__
+
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/rculist.h>
+
+struct au_splhead {
+       spinlock_t              spin;
+       struct list_head        head;
+};
+
+static inline void au_spl_init(struct au_splhead *spl)
+{
+       spin_lock_init(&spl->spin);
+       INIT_LIST_HEAD(&spl->head);
+}
+
+static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
+{
+       spin_lock(&spl->spin);
+       list_add(list, &spl->head);
+       spin_unlock(&spl->spin);
+}
+
+static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
+{
+       spin_lock(&spl->spin);
+       list_del(list);
+       spin_unlock(&spl->spin);
+}
+
+static inline void au_spl_del_rcu(struct list_head *list,
+                                 struct au_splhead *spl)
+{
+       spin_lock(&spl->spin);
+       list_del_rcu(list);
+       spin_unlock(&spl->spin);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_SPL_H__ */