From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 17 Sep 2013 02:22:16 +0000 (-0400)
Subject: dup_mnt_ns(): get rid of pointless grabbing of vfsmount_lock
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=aa7a574d0c54cc5a0aceb7357b5097342c0844ee;p=deliverable%2Flinux.git

dup_mnt_ns(): get rid of pointless grabbing of vfsmount_lock

mnt_list is protected by namespace_sem, not vfsmount_lock

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

diff --git a/fs/namespace.c b/fs/namespace.c
index 0e54ad6ccd8a..17ff1470b405 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2444,9 +2444,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
 		return ERR_CAST(new);
 	}
 	new_ns->root = new;
-	br_write_lock(&vfsmount_lock);
 	list_add_tail(&new_ns->list, &new->mnt_list);
-	br_write_unlock(&vfsmount_lock);
 
 	/*
 	 * Second pass: switch the tsk->fs->* elements and mark new vfsmounts