From 19cd9d185fbda31aebb6e38f1c25f551cc35a9f6 Mon Sep 17 00:00:00 2001
From: "S.J.R. van Schaik" <stephan@whiteboxsystems.nl>
Date: Fri, 19 May 2017 18:58:42 +0200
Subject: [PATCH] mufs: initial support for mounting/formatting

---
 include/fs/mufs.h      | 12 ++++++++++++
 source/fs/mufs/super.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 include/fs/mufs.h
 create mode 100644 source/fs/mufs/super.c

diff --git a/include/fs/mufs.h b/include/fs/mufs.h
new file mode 100644
index 0000000..d690dde
--- /dev/null
+++ b/include/fs/mufs.h
@@ -0,0 +1,12 @@
+#pragma once
+
+struct flash_dev;
+
+struct mufs {
+	struct flash_dev *dev;
+	uint32_t nblocks;
+	uint32_t root;
+};
+
+int mufs_mount(struct mufs *fs, struct flash_dev *dev);
+int mufs_format(struct flash_dev *dev);
diff --git a/source/fs/mufs/super.c b/source/fs/mufs/super.c
new file mode 100644
index 0000000..0531947
--- /dev/null
+++ b/source/fs/mufs/super.c
@@ -0,0 +1,47 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <flash.h>
+
+#include <fs/mufs.h>
+
+struct mufs_super {
+	char magic[4];
+	uint32_t nblocks;
+	uint32_t root;
+} __attribute__((packed));
+
+int mufs_mount(struct mufs *fs, struct flash_dev *dev)
+{
+	struct mufs_super super;
+
+	if (!fs || !dev)
+		return -1;
+
+	if (flash_read(dev, 0, &super, sizeof super) == 0)
+		return -1;
+
+	if (memcmp(super.magic, "mufs", 4) != 0)
+		return -1;
+
+	fs->dev = dev;
+	fs->nblocks = super.nblocks;
+	fs->root = super.root;
+
+	return 0;
+}
+
+int mufs_format(struct flash_dev *dev)
+{
+	struct mufs_super super;
+
+	memcpy(super.magic, "mufs", 4);
+	super.nblocks = flash_get_capacity(dev) >> dev->log2_block_size;
+	super.root = 0;
+
+	if (flash_write(dev, 0, &super, sizeof super) == 0)
+		return -1;
+
+	return 0;
+}