fs_is_visible only needs namespace_sem held shared

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

1 files changed, 2 insertions, 2 deletions

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;
 }