[PATCH 01/10] mm,fs: introduce helpers around the i_mmap_mutex

[Davidlohr Bueso]

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 <dbueso@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
---
 include/linux/fs.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a957d43..042d5c6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -454,6 +454,16 @@ 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?
  */
-- 
1.8.4.5

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