From 65db7cfbdac5556edaac5ba64a9e62d7c2a1735a Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sun, 25 Jun 2023 11:03:44 +0100
Subject: [PATCH] kernel: add filesystem model definitions

---
 include/socks/fs.h    | 71 +++++++++++++++++++++++++++++++++++++++++++
 include/socks/types.h |  2 ++
 2 files changed, 73 insertions(+)
 create mode 100644 include/socks/fs.h

diff --git a/include/socks/fs.h b/include/socks/fs.h
new file mode 100644
index 0000000..03df82d
--- /dev/null
+++ b/include/socks/fs.h
@@ -0,0 +1,71 @@
+#ifndef SOCKS_FS_H_
+#define SOCKS_FS_H_
+
+#include <socks/device.h>
+#include <socks/queue.h>
+
+#define SUPERBLOCK_ID_MAX 32
+
+struct kext;
+struct inode;
+struct dentry;
+struct super_block;
+
+enum filesystem_flags {
+	FS_REQUIRES_DEV = 0x01u,
+};
+
+struct super_block_ops {
+	kern_status_t(*write_inode)(struct inode *);
+	kern_status_t(*alloc_inode)(struct super_block *, struct inode **);
+	void(*destroy_inode)(struct inode *);
+
+	void(*destroy_super)(struct super_block *);
+};
+
+struct super_block {
+	struct device *s_dev;
+	unsigned long s_blocksize;
+	unsigned long s_flags;
+	struct dentry *s_root;
+	struct super_block_ops *s_ops;
+	char s_id[SUPERBLOCK_ID_MAX];
+};
+
+struct inode_ops {
+	kern_status_t(*create)(struct inode *, struct dentry *, umode_t);
+	kern_status_t(*mkdir)(struct inode *, struct dentry *, umode_t);
+	kern_status_t(*lookup)(struct inode *, struct dentry *, unsigned int);
+};
+
+struct dname {
+	uint64_t n_hash;
+	const char *n_str;
+};
+
+struct inode {
+	struct super_block *i_sb;
+	unsigned long i_ino;
+	unsigned long i_mode;
+	unsigned long i_uid;
+	unsigned long i_gid;
+	unsigned long i_nlink;
+	struct inode_ops *i_ops;
+};
+
+struct dentry {
+	struct dname d_name;
+	struct dentry *d_parent;
+	struct inode *d_inode;
+};
+
+struct filesystem_driver {
+	const char *fs_name;
+	struct kext *fs_owner;
+	struct queue_entry fs_head;
+	enum filesystem_flags fs_flags;
+
+	struct dentry *(*mount)(struct filesystem_driver *, struct device *, int flags);
+};
+
+#endif
diff --git a/include/socks/types.h b/include/socks/types.h
index 96dcf57..e70992a 100644
--- a/include/socks/types.h
+++ b/include/socks/types.h
@@ -8,4 +8,6 @@
 typedef uintptr_t phys_addr_t;
 typedef uint64_t cycles_t;
 
+typedef unsigned int umode_t;
+
 #endif