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

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Date:	Thu, 22 May 2014 20:33:22 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	akpm@...ux-foundation.org
Cc:	mingo@...nel.org, peterz@...radead.org, riel@...hat.com,
	mgorman@...e.de, davidlohr@...com, aswin@...com,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
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@...com>
---
 include/linux/fs.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1cab2f8..524d2c1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -456,6 +456,16 @@ 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?
  */
-- 
1.8.1.4

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