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

From: Davidlohr Bueso
Date: Thu Oct 30 2014 - 15:43:58 EST


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>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/fs.h | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 09d4480..f3a2372 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -467,6 +467,16 @@ 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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