[PATCH vfs-2.6 5/6] vfs: remove LOOKUP_PARENT from non LOOKUP_PARENT lookup

lookup_hash() with LOOKUP_PARENT is bogus. And this prepares to add
new intent on those path.

The user of LOOKUP_PARENT intent is nfs only, and it checks whether
nd->flags has LOOKUP_CREATE or LOOKUP_OPEN, so the result is same.
Signed-off-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

fs/namei.c

@@ -2170,16 +2170,19 @@ static long do_rmdir(int dfd, const char __user *pathname)
 		return error;
 
 	switch(nd.last_type) {
-		case LAST_DOTDOT:
-			error = -ENOTEMPTY;
-			goto exit1;
-		case LAST_DOT:
-			error = -EINVAL;
-			goto exit1;
-		case LAST_ROOT:
-			error = -EBUSY;
-			goto exit1;
+	case LAST_DOTDOT:
+		error = -ENOTEMPTY;
+		goto exit1;
+	case LAST_DOT:
+		error = -EINVAL;
+		goto exit1;
+	case LAST_ROOT:
+		error = -EBUSY;
+		goto exit1;
 	}
+
+	nd.flags &= ~LOOKUP_PARENT;
+
 	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
 	dentry = lookup_hash(&nd);
 	error = PTR_ERR(dentry);
@@ -2257,6 +2260,9 @@ static long do_unlinkat(int dfd, const char __user *pathname)
 	error = -EISDIR;
 	if (nd.last_type != LAST_NORM)
 		goto exit1;
+
+	nd.flags &= ~LOOKUP_PARENT;
+
 	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
 	dentry = lookup_hash(&nd);
 	error = PTR_ERR(dentry);
@@ -2646,6 +2652,9 @@ asmlinkage long sys_renameat(int olddfd, const char __user *oldname,
 	if (newnd.last_type != LAST_NORM)
 		goto exit2;
 
+	oldnd.flags &= ~LOOKUP_PARENT;
+	newnd.flags &= ~LOOKUP_PARENT;
+
 	trap = lock_rename(new_dir, old_dir);
 
 	old_dentry = lookup_hash(&oldnd);