Initial import

1 files changed, 111 insertions, 0 deletions

diff --git a/fs/aufs/spl.h b/fs/aufs/spl.h
new file mode 100644
index 000000000..94f09f298
--- /dev/null
+++ b/fs/aufs/spl.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2005-2015 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * simple list protected by a spinlock
+ */
+
+#ifndef __AUFS_SPL_H__
+#define __AUFS_SPL_H__
+
+#ifdef __KERNEL__
+
+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);
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_sphlhead {
+	spinlock_t		spin;
+	struct hlist_head	head;
+};
+
+static inline void au_sphl_init(struct au_sphlhead *sphl)
+{
+	spin_lock_init(&sphl->spin);
+	INIT_HLIST_HEAD(&sphl->head);
+}
+
+static inline void au_sphl_add(struct hlist_node *hlist,
+			       struct au_sphlhead *sphl)
+{
+	spin_lock(&sphl->spin);
+	hlist_add_head(hlist, &sphl->head);
+	spin_unlock(&sphl->spin);
+}
+
+static inline void au_sphl_del(struct hlist_node *hlist,
+			       struct au_sphlhead *sphl)
+{
+	spin_lock(&sphl->spin);
+	hlist_del(hlist);
+	spin_unlock(&sphl->spin);
+}
+
+static inline void au_sphl_del_rcu(struct hlist_node *hlist,
+				   struct au_sphlhead *sphl)
+{
+	spin_lock(&sphl->spin);
+	hlist_del_rcu(hlist);
+	spin_unlock(&sphl->spin);
+}
+
+static inline unsigned long au_sphl_count(struct au_sphlhead *sphl)
+{
+	unsigned long cnt;
+	struct hlist_node *pos;
+
+	cnt = 0;
+	spin_lock(&sphl->spin);
+	hlist_for_each(pos, &sphl->head)
+		cnt++;
+	spin_unlock(&sphl->spin);
+	return cnt;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_SPL_H__ */