Initial import

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/jfs/jfs_lock.h b/fs/jfs/jfs_lock.h
new file mode 100644
index 000000000..ecf048822
--- /dev/null
+++ b/fs/jfs/jfs_lock.h
@@ -0,0 +1,52 @@
+/*
+ *   Copyright (C) International Business Machines Corp., 2000-2001
+ *   Portions Copyright (C) Christoph Hellwig, 2001-2002
+ *
+ *   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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#ifndef _H_JFS_LOCK
+#define _H_JFS_LOCK
+
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+
+/*
+ *	jfs_lock.h
+ */
+
+/*
+ * Conditional sleep where condition is protected by spinlock
+ *
+ * lock_cmd and unlock_cmd take and release the spinlock
+ */
+#define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd)	\
+do {							\
+	DECLARE_WAITQUEUE(__wait, current);		\
+							\
+	add_wait_queue(&wq, &__wait);			\
+	for (;;) {					\
+		set_current_state(TASK_UNINTERRUPTIBLE);\
+		if (cond)				\
+			break;				\
+		unlock_cmd;				\
+		io_schedule();				\
+		lock_cmd;				\
+	}						\
+	__set_current_state(TASK_RUNNING);			\
+	remove_wait_queue(&wq, &__wait);		\
+} while (0)
+
+#endif				/* _H_JFS_LOCK */