From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 20 Nov 2016 04:23:18 +0000 (-0500)
Subject: clone_private_mount() doesn't need to touch namespace_sem
X-Git-Tag: v4.10-rc1~17^2^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=066715d3fde4834cbbec88d12ca277c4185b9303;p=karo-tx-linux.git

clone_private_mount() doesn't need to touch namespace_sem

not for CL_PRIVATE clone_mnt()

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

diff --git a/fs/namespace.c b/fs/namespace.c
index a1a04dd1ebfc..ec726ae00579 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1795,9 +1795,7 @@ struct vfsmount *clone_private_mount(struct path *path)
 	if (IS_MNT_UNBINDABLE(old_mnt))
 		return ERR_PTR(-EINVAL);
 
-	down_read(&namespace_sem);
 	new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);
-	up_read(&namespace_sem);
 	if (IS_ERR(new_mnt))
 		return ERR_CAST(new_mnt);