[vfs] VFS layer

core/vfs.c

@@ -0,0 +1,50 @@
+#include <system.h>
+#include <fs.h>
+
+fs_node_t *fs_root = 0;
+
+uint32_t read_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
+	if (node->read != 0) {
+		return node->read(node, offset, size, buffer);
+	} else {
+		return 0;
+	}
+}
+
+uint32_t write_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
+	if (node->write != 0) {
+		return node->write(node, offset, size, buffer);
+	} else {
+		return 0;
+	}
+}
+
+void open_fs(fs_node_t *node, uint8_t read, uint8_t write) {
+	if (node->open != 0) {
+		node->open(node, read, write);
+	}
+}
+
+void close_fs(fs_node_t *node) {
+	if (node->close != 0) {
+		node->close(node);
+	}
+}
+
+struct dirent * readdir_fs(fs_node_t *node, uint32_t index) {
+	if ((node->flags & 0x07) == FS_DIRECTORY && node->readdir != 0) {
+		return node->readdir(node, index);
+	} else {
+		return (struct dirent *)NULL;
+	}
+}
+
+fs_node_t *finddir_fs(fs_node_t *node, char *name) {
+	if ((node->flags & 0x07) == FS_DIRECTORY && node->readdir != 0) {
+		return node->finddir(node, name);
+	} else {
+		return (fs_node_t *)NULL;
+	}
+}
+
+

include/fs.h

@@ -0,0 +1,51 @@
+#ifndef FS_H
+#define FS_H
+
+#define FS_FILE        0x01
+#define FS_DIRECTORY   0x02
+#define FS_CHARDEVICE  0x03
+#define FS_BLOCKDEVICE 0x04
+#define FS_PIPE        0x05
+#define FS_SYMLINK     0x06
+#define FS_MOUNTPOINT  0x08
+
+typedef uint32_t (*read_type_t)(struct fs_node*, uint32_t, uint32_t, uint8_t *);
+typedef uint32_t (*write_type_t)(struct fs_node*, uint32_t, uint32_t, uint8_t *);
+typedef void (*open_type_t)(struct fs_node*);
+typedef void (*close_type_t)(struct fs_node*);
+typedef struct dirent * (*readdir_type_t)(struct fs_node*, uint32_t);
+typedef struct fs_node * (*finddir_type_t)(struct fs_node*, char *name);
+
+struct dirent {
+	char name[256];
+	uint32_t ino;
+};
+
+typedef struct fs_node {
+	char		name[256];
+	uint32_t	mask;
+	uint32_t	uid;
+	uint32_t	gid;
+	uint32_t	flags;
+	uint32_t	inode;
+	uint32_t	length;
+	uint32_t	impl;
+	read_type_t		read;
+	write_type_t	write;
+	open_type_t		open;
+	close_type_t	close;
+	readdir_type_t	readdir;
+	finddir_type_t	finddir;
+	struct fs_node	*ptr;
+} fs_node_t;
+
+extern *fs_root = 0;
+
+uint32_t read_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
+uint32_t write_fs(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
+void open_fs(fs_node_t *node, uint8_t read, uint8_t write);
+void close_fs(fs_node_t *node);
+struct dirent *readdir_fs(fs_node_t *node, uint32_t index);
+fs_node_t *finddir_fs(fs_node_t *node, char *name);
+
+#endif

include/system.h

@@ -8,6 +8,7 @@
 typedef unsigned long uintptr_t;
 typedef long size_t;
 typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
 
 /* Unimportant Kernel Strings */
 #define KERNEL_UNAME "ToAruOS"