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-rw-r--r--fs/jfs/jfs_lock.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/jfs/jfs_lock.h b/fs/jfs/jfs_lock.h
new file mode 100644
index 0000000000..feb37dd9de
--- /dev/null
+++ b/fs/jfs/jfs_lock.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2001
+ * Portions Copyright (C) Christoph Hellwig, 2001-2002
+ */
+#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 */