mm: convert i_mmap_mutex to rwsem

[deliverable/linux.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index bd0a1b2f3c0212a58440f82c4413bfbd76607302..6abcd0b72ae001583f9072ca2be010fafadc0cf3 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -18,6 +18,7 @@
 #include <linux/pid.h>
 #include <linux/bug.h>
 #include <linux/mutex.h>
+#include <linux/rwsem.h>
 #include <linux/capability.h>
 #include <linux/semaphore.h>
 #include <linux/fiemap.h>
@@ -401,7 +402,7 @@ struct address_space {
        atomic_t                i_mmap_writable;/* count VM_SHARED mappings */
        struct rb_root          i_mmap;         /* tree of private and shared mappings */
        struct list_head        i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
-       struct mutex            i_mmap_mutex;   /* protect tree, count, list */
+       struct rw_semaphore     i_mmap_rwsem;   /* protect tree, count, list */
        /* Protected by tree_lock together with the radix tree */
        unsigned long           nrpages;        /* number of total pages */
        unsigned long           nrshadows;      /* number of shadow entries */
@@ -469,12 +470,12 @@ 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);
+       down_write(&mapping->i_mmap_rwsem);
 }
 
 static inline void i_mmap_unlock_write(struct address_space *mapping)
 {
-       mutex_unlock(&mapping->i_mmap_mutex);
+       up_write(&mapping->i_mmap_rwsem);
 }
 
 /*