From 4e09bca9e34c226b6d7e34b4fa11248405fd988e Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 22 Oct 2023 19:50:38 +0200
Subject: Move everything into a new repo.

---
 fs/vfs.h | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 fs/vfs.h

(limited to 'fs/vfs.h')

diff --git a/fs/vfs.h b/fs/vfs.h
new file mode 100644
index 0000000..b3ef3e1
--- /dev/null
+++ b/fs/vfs.h
@@ -0,0 +1,94 @@
+typedef struct vfs_fd vfs_fd_t;
+typedef struct vfs_inode vfs_inode_t;
+typedef struct vfs_vm_object vfs_vm_object_t;
+typedef struct vfs_mounts vfs_mounts_t;
+#ifndef VFS_H
+#define VFS_H
+#include <limits.h>
+#include <sched/scheduler.h>
+#include <socket.h>
+#include <stddef.h>
+#include <stdint.h>
+
+// FIXME: Is there some standard value for this?
+#define O_NONBLOCK (1 << 0)
+#define O_READ (1 << 1)
+#define O_WRITE (1 << 2)
+#define O_CREAT (1 << 3)
+#define O_RDONLY O_READ
+#define O_WRONLY O_WRITE
+#define O_RDWR (O_WRITE | O_READ)
+
+#define FS_TYPE_FILE 0
+#define FS_TYPE_UNIX_SOCKET 1
+#define FS_TYPE_CHAR_DEVICE 2
+#define FS_TYPE_BLOCK_DEVICE 3
+#define FS_TYPE_DIRECTORY 4
+#define FS_TYPE_LINK 7
+
+struct vfs_vm_object {
+  void *virtual_object;
+  void **object;
+  uint64_t size;
+};
+
+struct vfs_mounts {
+  char *path;
+  vfs_inode_t *local_root;
+};
+
+struct dirent {
+  unsigned int d_ino;    // File serial number.
+  char d_name[PATH_MAX]; // Filename string of entry.
+};
+
+struct vfs_fd {
+  size_t offset;
+  int flags;
+  int mode;
+  int reference_count; // Number of usages of this file descriptor,
+                           // once it reaches zero then the contents can
+                           // be freed.
+  vfs_inode_t *inode;
+};
+
+struct vfs_inode {
+  int inode_num;
+  int type;
+  uint8_t has_data;
+  uint8_t can_write;
+  uint8_t is_open;
+  void *internal_object;
+  uint64_t file_size;
+  vfs_inode_t *(*open)(const char *path);
+  int (*create_file)(const char *path, int mode);
+  int (*read)(uint8_t *buffer, uint64_t offset, uint64_t len, vfs_fd_t *fd);
+  int (*write)(uint8_t *buffer, uint64_t offset, uint64_t len, vfs_fd_t *fd);
+  void (*close)(vfs_fd_t *fd);
+  vfs_vm_object_t *(*get_vm_object)(uint64_t length, uint64_t offset,
+                                    vfs_fd_t *fd);
+};
+
+int vfs_close(int fd);
+vfs_fd_t *get_vfs_fd(int fd);
+int vfs_open(const char *file, int flags, int mode);
+void vfs_mount(char *path, vfs_inode_t *local_root);
+int vfs_pwrite(int fd, void *buf, uint64_t count, uint64_t offset);
+int raw_vfs_pwrite(vfs_fd_t *vfs_fd, void *buf, uint64_t count,
+                   uint64_t offset);
+int vfs_pread(int fd, void *buf, uint64_t count, uint64_t offset);
+vfs_vm_object_t *vfs_get_vm_object(int fd, uint64_t length, uint64_t offset);
+int vfs_dup2(int org_fd, int new_fd);
+vfs_inode_t *vfs_internal_open(const char *file);
+int vfs_create_fd(int flags, int mode, vfs_inode_t *inode, vfs_fd_t **fd);
+vfs_inode_t *vfs_create_inode(
+    int inode_num, int type, uint8_t has_data, uint8_t can_write,
+    uint8_t is_open, void *internal_object, uint64_t file_size,
+    vfs_inode_t *(*open)(const char *path),
+    int (*create_file)(const char *path, int mode),
+    int (*read)(uint8_t *buffer, uint64_t offset, uint64_t len, vfs_fd_t *fd),
+    int (*write)(uint8_t *buffer, uint64_t offset, uint64_t len, vfs_fd_t *fd),
+    void (*close)(vfs_fd_t *fd),
+    vfs_vm_object_t *(*get_vm_object)(uint64_t length, uint64_t offset,
+                                      vfs_fd_t *fd));
+#endif
-- 
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