From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 17 Sep 2013 01:37:36 +0000 (-0400)
Subject: fs_is_visible only needs namespace_sem held shared
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=44bb4385ce1cfb231d37cbc7bb6faf70f98b7b17;p=deliverable%2Flinux.git

fs_is_visible only needs namespace_sem held shared

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

diff --git a/fs/namespace.c b/fs/namespace.c
index 827aea4c3242..0e54ad6ccd8a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2869,7 +2869,7 @@ bool fs_fully_visible(struct file_system_type *type)
 	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 @@ bool fs_fully_visible(struct file_system_type *type)
 	next:	;
 	}
 found:
-	namespace_unlock();
+	up_read(&namespace_sem);
 	return visible;
 }