[PATCH 1/5] mm,fs: introduce helpers around i_mmap_mutex

Davidlohr Bueso
2014-05-23T03:35:21Z

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@hp.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