linux-kernel - [PATCH 1/5] mm,fs: introduce helpers around i_mmap

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Date:	Mon, 24 Jun 2013 17:21:34 -0700
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	mingo@...nel.org, akpm@...ux-foundation.org
Cc:	walken@...gle.com, alex.shi@...el.com, tim.c.chen@...ux.intel.com,
	a.p.zijlstra@...llo.nl, riel@...hat.com, peter@...leysoftware.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Davidlohr Bueso <davidlohr.bueso@...com>
Subject: [PATCH 1/5] mm,fs: introduce helpers around i_mmap_mutex

Various parts of the kernel acquire and release this mutex,
so add i_mmap_lock_write() and immap_unlock_write() helper
functions that will encapsulate this logic. The next patch
will make use of these.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
---
 include/linux/fs.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 65c2be2..1ea6c68 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -475,6 +475,16 @@ struct block_device {
 
 int mapping_tagged(struct address_space *mapping, int tag);
 
+static inline void i_mmap_lock_write(struct address_space *mapping)
+{
+	mutex_lock(&mapping->i_mmap_mutex);
+}
+
+static inline void i_mmap_unlock_write(struct address_space *mapping)
+{
+	mutex_unlock(&mapping->i_mmap_mutex);
+}
+
 /*
  * Might pages of this file be mapped into userspace?
  */
-- 
1.7.11.7

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