commit 44bb4385ce1cfb231d37cbc7bb6faf70f98b7b17
author Al Viro <viro@zeniv.linux.org.uk> Mon Sep 16 21:37:36 2013 -0400
committer Al Viro <viro@zeniv.linux.org.uk> Thu Oct 24 23:34:55 2013 -0400
tree e621c6e441a714836f0ccd2f98ccc461669ba0bd
parent 59aa0da8e232f990be793d0ea23ca74675b236b3

fs_is_visible only needs namespace_sem held shared

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 827aea4..0e54ad6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2869,7 +2869,7 @@
 	if (unlikely(!ns))
 		return false;
 
-	namespace_lock();
+	down_read(&namespace_sem);
 	list_for_each_entry(mnt, &ns->list, mnt_list) {
 		struct mount *child;
 		if (mnt->mnt.mnt_sb->s_type != type)
@@ -2890,7 +2890,7 @@
 	next:	;
 	}
 found:
-	namespace_unlock();
+	up_read(&namespace_sem);
 	return visible;
 }