From: Miklos Szeredi <mszeredi@xxxxxxx>
Needed by fuse writepage.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---
Index: linux/include/linux/rwsem.h
===================================================================
--- linux.orig/include/linux/rwsem.h 2007-02-27 14:40:55.000000000 +0100
+++ linux/include/linux/rwsem.h 2007-02-27 14:41:09.000000000 +0100
@@ -82,11 +82,13 @@ extern void down_write_nested(struct rw_
* proper abstraction for this case is completions. ]
*/
extern void down_read_non_owner(struct rw_semaphore *sem);
+extern int down_read_trylock_non_owner(struct rw_semaphore *sem);
extern void up_read_non_owner(struct rw_semaphore *sem);
#else
# define down_read_nested(sem, subclass) down_read(sem)
# define down_write_nested(sem, subclass) down_write(sem)
# define down_read_non_owner(sem) down_read(sem)
+# define down_read_trylock_non_owner(sem) down_read_trylock(sem)
# define up_read_non_owner(sem) up_read(sem)
#endif
Index: linux/kernel/rwsem.c
===================================================================
--- linux.orig/kernel/rwsem.c 2007-02-27 14:40:55.000000000 +0100
+++ linux/kernel/rwsem.c 2007-02-27 14:41:09.000000000 +0100
@@ -125,6 +125,13 @@ void down_read_non_owner(struct rw_semap
EXPORT_SYMBOL(down_read_non_owner);
+int down_read_trylock_non_owner(struct rw_semaphore *sem)
+{
+ return __down_read_trylock(sem);
+}
+
+EXPORT_SYMBOL(down_read_trylock_non_owner);
+
void down_write_nested(struct rw_semaphore *sem, int subclass)
{
might_sleep();
--
-
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