[readdir] convert openpromfs

what the hell is op_mutex for, BTW?
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/openpromfs/inode.c

@@ -162,11 +162,11 @@ static const struct file_operations openpromfs_prop_ops = {
 	.release	= seq_release,
 };
 
-static int openpromfs_readdir(struct file *, void *, filldir_t);
+static int openpromfs_readdir(struct file *, struct dir_context *);
 
 static const struct file_operations openprom_operations = {
 	.read		= generic_read_dir,
-	.readdir	= openpromfs_readdir,
+	.iterate	= openpromfs_readdir,
 	.llseek		= generic_file_llseek,
 };
 
@@ -260,38 +260,31 @@ static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry
 	return NULL;
 }
 
-static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
+static int openpromfs_readdir(struct file *file, struct dir_context *ctx)
 {
-	struct inode *inode = file_inode(filp);
+	struct inode *inode = file_inode(file);
 	struct op_inode_info *oi = OP_I(inode);
 	struct device_node *dp = oi->u.node;
 	struct device_node *child;
 	struct property *prop;
-	unsigned int ino;
 	int i;
 
 	mutex_lock(&op_mutex);
 	
-	ino = inode->i_ino;
-	i = filp->f_pos;
-	switch (i) {
-	case 0:
-		if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
+	if (ctx->pos == 0) {
+		if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
 			goto out;
-		i++;
-		filp->f_pos++;
-		/* fall thru */
-	case 1:
-		if (filldir(dirent, "..", 2, i,
+		ctx->pos = 1;
+	}
+	if (ctx->pos == 1) {
+		if (!dir_emit(ctx, "..", 2,
 			    (dp->parent == NULL ?
 			     OPENPROM_ROOT_INO :
-			     dp->parent->unique_id), DT_DIR) < 0) 
+			     dp->parent->unique_id), DT_DIR))
 			goto out;
-		i++;
-		filp->f_pos++;
-		/* fall thru */
-	default:
-		i -= 2;
+		ctx->pos = 2;
+	}
+	i = ctx->pos - 2;
 
 	/* First, the children nodes as directories.  */
 	child = dp->child;
@@ -300,13 +293,13 @@ static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filld
 		i--;
 	}
 	while (child) {
-			if (filldir(dirent,
+		if (!dir_emit(ctx,
 			    child->path_component_name,
 			    strlen(child->path_component_name),
-				    filp->f_pos, child->unique_id, DT_DIR) < 0)
+			    child->unique_id, DT_DIR))
 			goto out;
 
-			filp->f_pos++;
+		ctx->pos++;
 		child = child->sibling;
 	}
 
@@ -317,14 +310,14 @@ static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filld
 		i--;
 	}
 	while (prop) {
-			if (filldir(dirent, prop->name, strlen(prop->name),
-				    filp->f_pos, prop->unique_id, DT_REG) < 0)
+		if (!dir_emit(ctx, prop->name, strlen(prop->name),
+			    prop->unique_id, DT_REG))
 			goto out;
 
-			filp->f_pos++;
+		ctx->pos++;
 		prop = prop->next;
 	}
-	}
+
 out:
 	mutex_unlock(&op_mutex);
 	return 0;