From b6c5d5bbda17011bf046b14c9d112091e0fefe8d Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Fri, 19 May 2017 16:21:11 +0200
Subject: [PATCH] ftl: implemented ftl_mount() to seamlessly wrap flash devices

---
 include/ftl.h    |  2 ++
 source/ftl/dev.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 source/ftl/dev.c

diff --git a/include/ftl.h b/include/ftl.h
index c03d68e..c231790 100644
--- a/include/ftl.h
+++ b/include/ftl.h
@@ -35,3 +35,5 @@ int ftl_read(struct ftl_map *map, void *data, size_t len, uint32_t va);
 int ftl_trim(struct ftl_map *map, uint32_t va);
 uint32_t ftl_get_size(const struct ftl_map *map);
 uint32_t ftl_get_capacity(const struct ftl_map *map);
+
+struct flash_dev *ftl_mount(struct flash_dev *raw_dev);
diff --git a/source/ftl/dev.c b/source/ftl/dev.c
new file mode 100644
index 0000000..1d9f571
--- /dev/null
+++ b/source/ftl/dev.c
@@ -0,0 +1,97 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include <flash.h>
+#include <ftl.h>
+
+static size_t ftl_flash_get_size(struct flash_dev *dev);
+static size_t ftl_flash_get_capacity(struct flash_dev *dev);
+static int ftl_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
+	size_t len);
+static int ftl_flash_write(struct flash_dev *dev, uint32_t addr,
+	const void *data, size_t len);
+static int ftl_flash_erase(struct flash_dev *dev, uint32_t addr,
+	size_t block_size);
+
+static struct flash_ops ftl_flash_ops = {
+	.get_size = ftl_flash_get_size,
+	.get_capacity = ftl_flash_get_capacity,
+	.read = ftl_flash_read,
+	.write = ftl_flash_write,
+	/* TODO: implement default function to perform a copy. */
+	.copy = NULL,
+	.erase = ftl_flash_erase,
+};
+
+static size_t ftl_flash_get_size(struct flash_dev *dev)
+{
+	struct ftl_map *map = dev->priv;
+
+	return ftl_get_size(map);
+}
+
+static size_t ftl_flash_get_capacity(struct flash_dev *dev)
+{
+	struct ftl_map *map = dev->priv;
+
+	return ftl_get_capacity(map);
+}
+
+static int ftl_flash_read(struct flash_dev *dev, uint32_t addr, void *data,
+	size_t len)
+{
+	struct ftl_map *map = dev->priv;
+
+	return ftl_read(map, data, len, addr);
+}
+
+static int ftl_flash_write(struct flash_dev *dev, uint32_t addr,
+	const void *data, size_t len)
+{
+	struct ftl_map *map = dev->priv;
+
+	/* TODO: support len */
+	(void)len;
+
+	return ftl_write(map, addr, data);
+}
+
+static int ftl_flash_erase(struct flash_dev *dev, uint32_t addr,
+	size_t block_size)
+{
+	struct ftl_map *map = dev->priv;
+
+	/* TODO */
+	(void)block_size;
+
+	return ftl_trim(map, addr);
+}
+
+struct flash_dev *ftl_mount(struct flash_dev *raw_dev)
+{
+	struct flash_dev *dev;
+	struct ftl_map *map;
+
+	if (!(dev = malloc(sizeof *dev)))
+		return NULL;
+
+	if (!(map = malloc(sizeof *map)))
+		goto err_free_dev;
+
+	if (ftl_init_map(map, raw_dev) < 0)
+		goto err_free_map;
+
+	/* TODO: inspect return value? */
+	ftl_resume_map(map);
+
+	dev->ops = &ftl_flash_ops;
+	dev->priv = map;
+
+	return dev;
+
+err_free_map:
+	free(map);
+err_free_dev:
+	free(dev);
+	return NULL;
+}