From e15742fac894e2d5be3d0d44411a5cd24f794e18 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 10 Dec 2020 22:41:08 +0100
Subject: Started VFS

I have plans to remove the whole event system and make everything
a file - just like Unix does. It's way easier that way actually.
---
 kernel/features/fs.c | 40 +++++++++++++++++++++++++++++++++++++++-
 kernel/inc/fs.h      | 30 +++++++++++++++++++++++++++++-
 2 files changed, 68 insertions(+), 2 deletions(-)

(limited to 'kernel')

diff --git a/kernel/features/fs.c b/kernel/features/fs.c
index 480f199..00aa152 100644
--- a/kernel/features/fs.c
+++ b/kernel/features/fs.c
@@ -1,5 +1,4 @@
 // MIT License, Copyright (c) 2020 Marvin Borner
-// EXT2 based filesystem
 
 #include <assert.h>
 #include <def.h>
@@ -9,6 +8,10 @@
 #include <print.h>
 #include <str.h>
 
+/**
+ * EXT2
+ */
+
 void *buffer_read(u32 block)
 {
 	return ide_read(malloc(BLOCK_SIZE), block);
@@ -180,3 +183,38 @@ u32 file_stat(char *path)
 
 	return in->size;
 }
+
+/**
+ * VFS
+ */
+
+static struct list *mount_points = NULL;
+
+struct device *vfs_mounted(const char *path)
+{
+	struct node *iterator = mount_points->head;
+	while (iterator) {
+		if (!strcmp(iterator->data, path))
+			return iterator->data;
+		iterator = iterator->next;
+	}
+	return NULL;
+}
+
+u32 vfs_mount(struct device *dev, const char *path)
+{
+	if (!dev || !dev->id || vfs_mounted(path))
+		return 0;
+
+	struct mount_info *m = malloc(sizeof(*m));
+	m->path = strdup(path);
+	m->dev = dev;
+	list_add(mount_points, m);
+
+	return 1;
+}
+
+void vfs_install()
+{
+	mount_points = list_new();
+}
diff --git a/kernel/inc/fs.h b/kernel/inc/fs.h
index 156bb8c..7336a72 100644
--- a/kernel/inc/fs.h
+++ b/kernel/inc/fs.h
@@ -1,11 +1,14 @@
 // MIT License, Copyright (c) 2020 Marvin Borner
-// EXT2 based filesystem
 
 #ifndef FS_H
 #define FS_H
 
 #include <def.h>
 
+/**
+ * EXT2
+ */
+
 #define EXT2_BOOT 0
 #define EXT2_SUPER 1
 #define EXT2_ROOT 2
@@ -96,4 +99,29 @@ struct file {
 void *file_read(char *path);
 u32 file_stat(char *path);
 
+/**
+ * VFS
+ */
+
+struct device {
+	u32 id;
+	const char *name;
+	int type; // TODO: Block, char device
+	struct vfs *vfs;
+	u8 (*read)(u8 *buf, u32 offset, u32 count, struct device *dev);
+	u8 (*write)(u8 *buf, u32 offset, u32 count, struct device *dev);
+};
+
+struct vfs {
+	const char *name;
+	u8 (*probe)(struct device *);
+	u8 (*read)(char *, char *, struct device *, void *);
+	u8 (*mount)(struct device *, void *);
+};
+
+struct mount_info {
+	const char *path;
+	struct device *dev;
+};
+
 #endif
-- 
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