[PATCH] r/o bind mount prepwork: move open_namei()'s vfs_create()

The code around vfs_create() in open_namei() is getting a bit too complex.
Right now, there is at least the reference count on the dentry, and the
i_mutex to worry about.  Soon, we'll also have mnt_writecount.

So, break the vfs_create() call out of open_namei(), and into a helper
function.  This duplicates the call to may_open(), but that isn't such a bad
thing since the arguments (acc_mode and flag) were being heavily massaged
anyway.
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/namei.c

@@ -1595,6 +1595,24 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
 	return 0;
 }
 
+static int open_namei_create(struct nameidata *nd, struct path *path,
+				int flag, int mode)
+{
+	int error;
+	struct dentry *dir = nd->dentry;
+
+	if (!IS_POSIXACL(dir->d_inode))
+		mode &= ~current->fs->umask;
+	error = vfs_create(dir->d_inode, path->dentry, mode, nd);
+	mutex_unlock(&dir->d_inode->i_mutex);
+	dput(nd->dentry);
+	nd->dentry = path->dentry;
+	if (error)
+		return error;
+	/* Don't check for write permission, don't truncate */
+	return may_open(nd, 0, flag & ~O_TRUNC);
+}
+
 /*
  *	open_namei()
  *
@@ -1676,18 +1694,10 @@ int open_namei(int dfd, const char *pathname, int flag,
 
 	/* Negative dentry, just create the file */
 	if (!path.dentry->d_inode) {
-		if (!IS_POSIXACL(dir->d_inode))
-			mode &= ~current->fs->umask;
-		error = vfs_create(dir->d_inode, path.dentry, mode, nd);
-		mutex_unlock(&dir->d_inode->i_mutex);
-		dput(nd->dentry);
-		nd->dentry = path.dentry;
+		error = open_namei_create(nd, &path, flag, mode);
 		if (error)
 			goto exit;
-		/* Don't check for write permission, don't truncate */
-		acc_mode = 0;
-		flag &= ~O_TRUNC;
-		goto ok;
+		return 0;
 	}
 
 	/*