Finished adding untested bare functionality vfs

Finished adding untested shm syscalls.
Finished adding untested l4 send/recv helpers

Everything compiles. Now going to fix lots of bugs ;-)

tasks/fs0/src/c0fs/c0fs.c

@@ -0,0 +1,29 @@
+/*
+ * A basic unix-like read/writeable filesystem for Codezero.
+ *
+ * Copyright (C) 2007, 2008 Bahadir Balban
+ */
+#include <init.h>
+#include <fs.h>
+
+void sfs_read_sb(struct superblock *sb)
+{
+
+}
+
+static void simplefs_alloc_vnode(struct vnode *)
+{
+
+}
+
+struct file_system_type sfs_type = {
+	.name = "c0fs",
+	.magic = 1,
+	.flags = 0,
+};
+
+/* Registers sfs as an available filesystem type */
+void sfs_register_fstype(struct list_head *fslist)
+{
+	list_add(&sfs_type.list, fslist);
+}

tasks/fs0/src/c0fs/c0fs.h

@@ -0,0 +1,113 @@
+/*
+ * The disk layout of our simple unix-like filesystem.
+ *
+ * Copyright (C) 2007, 2008 Bahadir Balban
+ */
+
+#ifndef __C0FS_LAYOUT_H__
+#define __C0FS_LAYOUT_H__
+
+#include <l4lib/types.h>
+#include <l4/lib/list.h>
+#include <l4/macros.h>
+#include <l4/config.h>
+#include INC_GLUE(memory.h)
+
+/*
+ *
+ * Filesystem layout:
+ *
+ * |---------------|
+ * |    Group 0    |
+ * |---------------|
+ * |    Group 1    |
+ * |---------------|
+ * |      ...      |
+ * |---------------|
+ * |    Group n    |
+ * |---------------|
+ *
+ *
+ * Group layout:
+ *
+ * |---------------|
+ * |  Superblock   |
+ * |---------------|
+ * |  Inode table  |
+ * |---------------|
+ * |  Data blocks  |
+ * |---------------|
+ *
+ * or
+ *
+ * |---------------|
+ * |  Data blocks  |
+ * |---------------|
+ *
+ */
+
+#define BLOCK_SIZE		PAGE_SIZE
+#define BLOCK_BITS		PAGE_BITS
+#define GROUP_SIZE		SZ_8MB
+#define INODE_TABLE_SIZE	((GROUP_SIZE / BLOCK_SIZE) / 2)
+#define INODE_BITMAP_SIZE	(INODE_TABLE_SIZE >> 5)
+
+
+struct sfs_superblock {
+	u32 magic;		/* Filesystem magic number */
+	u64 fssize;		/* Total size of filesystem */
+	u32 total;		/* To */
+	u32 groupmap[];		/* Bitmap of all fs groups */
+};
+
+struct sfs_group_table {
+	u32 total;
+	u32 free;
+	u32 groupmap[];
+};
+
+struct sfs_inode_table {
+	u32 total;
+	u32 free;
+	u32 inodemap[INODE_BITMAP_SIZE];
+	struct sfs_inode inode[INODE_TABLE_SIZE];
+};
+
+/*
+ * The purpose of an inode:
+ *
+ * 1) Uniquely identify a file or a directory.
+ * 2) Keep file/directory metadata.
+ * 3) Provide access means to file blocks/directory contents.
+ */
+#define INODE_DIRECT_BLOCKS	5
+struct sfs_inode_blocks {
+	int  szidx;		/* Direct array index size */
+	unsigned long indirect;
+	unsigned long indirect2;
+	unsigned long indirect3;
+	unsigned long direct[];
+};
+
+struct sfs_inode {
+	u32 unum;	/* Unit number this inode is in */
+	u32 inum;	/* Inode number */
+	u32 mode;	/* File permissions */
+	u32 owner;	/* File owner */
+	u64 atime;	/* Last access time */
+	u64 mtime;	/* Last content modification */
+	u64 ctime;	/* Last inode modification */
+	u64 size;	/* Size of contents */
+	struct sfs_inode_blocks blocks;
+} __attribute__ ((__packed__));
+
+struct sfs_dentry {
+	u32 inum;	/* Inode number */
+	u32 nlength;	/* Name length */
+	u8  name[];	/* Name string */
+} __attribute__ ((__packed__));
+
+
+void sfs_register_type(struct list_head *);
+
+#endif /* __C0FS_LAYOUT_H__ */