From 2868cbea72dc89ae0eb17693596b1dedaafff1c5 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Fri, 3 Apr 2009 16:42:38 +0100
Subject: [PATCH] FS-Cache: Bit waiting helpers

Add helpers for use with wait_on_bit().

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
---
 fs/fscache/internal.h |  3 +++
 fs/fscache/main.c     | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 4c6ba561e966..16389942a54e 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -82,6 +82,9 @@ extern unsigned fscache_defer_create;
 extern unsigned fscache_debug;
 extern struct kobject *fscache_root;
 
+extern int fscache_wait_bit(void *);
+extern int fscache_wait_bit_interruptible(void *);
+
 /*
  * fsc-proc.c
  */
diff --git a/fs/fscache/main.c b/fs/fscache/main.c
index 48b79d2deac1..4de41b597499 100644
--- a/fs/fscache/main.c
+++ b/fs/fscache/main.c
@@ -102,3 +102,23 @@ static void __exit fscache_exit(void)
 }
 
 module_exit(fscache_exit);
+
+/*
+ * wait_on_bit() sleep function for uninterruptible waiting
+ */
+int fscache_wait_bit(void *flags)
+{
+	schedule();
+	return 0;
+}
+EXPORT_SYMBOL(fscache_wait_bit);
+
+/*
+ * wait_on_bit() sleep function for interruptible waiting
+ */
+int fscache_wait_bit_interruptible(void *flags)
+{
+	schedule();
+	return signal_pending(current);
+}
+EXPORT_SYMBOL(fscache_wait_bit_interruptible);
-- 
2.39.5