From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 22 Mar 2008 20:14:30 +0000 (-0400)
Subject: [PATCH] mnt_expire is protected by namespace_sem, no need for vfsmount_lock
X-Git-Tag: v3.12-rc1~22218^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6758f953d05378d907a164c67934cd86183d9c88;p=kernel%2Fkernel-generic.git

[PATCH] mnt_expire is protected by namespace_sem, no need for vfsmount_lock

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

diff --git a/fs/namespace.c b/fs/namespace.c
index 7bd74b2..94f026e 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -262,10 +262,8 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
 		/* stick the duplicate mount on the same expiry list
 		 * as the original if that was on one */
 		if (flag & CL_EXPIRE) {
-			spin_lock(&vfsmount_lock);
 			if (!list_empty(&old->mnt_expire))
 				list_add(&mnt->mnt_expire, &old->mnt_expire);
-			spin_unlock(&vfsmount_lock);
 		}
 	}
 	return mnt;
@@ -1127,11 +1125,9 @@ static noinline int do_move_mount(struct nameidata *nd, char *old_name)
 	if (err)
 		goto out1;
 
-	spin_lock(&vfsmount_lock);
 	/* if the mount is moved, it should no longer be expire
 	 * automatically */
 	list_del_init(&old_nd.path.mnt->mnt_expire);
-	spin_unlock(&vfsmount_lock);
 out1:
 	mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 out:
@@ -1198,12 +1194,9 @@ int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
 	if ((err = graft_tree(newmnt, nd)))
 		goto unlock;
 
-	if (fslist) {
-		/* add to the specified expiration list */
-		spin_lock(&vfsmount_lock);
+	if (fslist) /* add to the specified expiration list */
 		list_add_tail(&newmnt->mnt_expire, fslist);
-		spin_unlock(&vfsmount_lock);
-	}
+
 	up_write(&namespace_sem);
 	return 0;