linux-kernel - [PATCH 16/43] FS-Cache: Bit waiting helpers [ver #46]

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Message-ID: <20090401230443.28177.95944.stgit@warthog.procyon.org.uk>
Date:	Thu, 02 Apr 2009 00:04:44 +0100
From:	David Howells <dhowells@...hat.com>
To:	viro@...IV.linux.org.uk
Cc:	dhowells@...hat.com, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 16/43] FS-Cache: Bit waiting helpers [ver #46]

Add helpers for use with wait_on_bit().

Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Steve Dickson <steved@...hat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 fs/fscache/internal.h |    3 +++
 fs/fscache/main.c     |   20 ++++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)


diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 4c6ba56..1638994 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 48b79d2..4de41b5 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);

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