/*
 * GeekOS file system
 * Copyright (c) 2004, David H. Hovemeyer <daveho@cs.umd.edu>
 * $Revision: 1.53 $
 *
 * This is free software.  You are permitted to use,
 * redistribute, and modify it as specified in the file "COPYING".
 */

#include <limits.h>
#include <geekos/errno.h>
#include <geekos/kassert.h>
#include <geekos/screen.h>
#include <geekos/malloc.h>
#include <geekos/string.h>
#include <geekos/bitset.h>
#include <geekos/synch.h>
#include <geekos/bufcache.h>
#include <geekos/gosfs.h>

/* ----------------------------------------------------------------------
 * Private data and functions
 * ---------------------------------------------------------------------- */

/* ----------------------------------------------------------------------
 * Implementation of VFS operations
 * ---------------------------------------------------------------------- */

/*
 * Get metadata for given file.
 */
static int GOSFS_FStat(struct File *file, struct VFS_File_Stat *stat)
{
    TODO("GeekOS filesystem FStat operation");
}

/*
 * Read data from current position in file.
 */
static int GOSFS_Read(struct File *file, void *buf, ulong_t numBytes)
{
    TODO("GeekOS filesystem read operation");
}

/*
 * Write data to current position in file.
 */
static int GOSFS_Write(struct File *file, void *buf, ulong_t numBytes)
{
    TODO("GeekOS filesystem write operation");
}

/*
 * Seek to a position in file.
 */
static int GOSFS_Seek(struct File *file, ulong_t pos)
{
    TODO("GeekOS filesystem seek operation");
}

/*
 * Close a file.
 */
static int GOSFS_Close(struct File *file)
{
    TODO("GeekOS filesystem close operation");
}

/*static*/ struct File_Ops s_gosfsFileOps = {
    &GOSFS_FStat,
    &GOSFS_Read,
    &GOSFS_Write,
    &GOSFS_Seek,
    &GOSFS_Close,
    0, /* Read_Entry */
};

/*
 * Stat operation for an already open directory.
 */
static int GOSFS_FStat_Directory(struct File *dir, struct VFS_File_Stat *stat)
{
    TODO("GeekOS filesystem FStat directory operation");
}

/*
 * Directory Close operation.
 */
static int GOSFS_Close_Directory(struct File *dir)
{
    TODO("GeekOS filesystem Close directory operation");
}

/*
 * Read a directory entry from an open directory.
 */
static int GOSFS_Read_Entry(struct File *dir, struct VFS_Dir_Entry *entry)
{
    TODO("GeekOS filesystem Read_Entry operation");
}

/*static*/ struct File_Ops s_gosfsDirOps = {
    &GOSFS_FStat_Directory,
    0, /* Read */
    0, /* Write */
    0, /* Seek */
    &GOSFS_Close_Directory,
    &GOSFS_Read_Entry,
};

/*
 * Open a file named by given path.
 */
static int GOSFS_Open(struct Mount_Point *mountPoint, const char *path, int mode, struct File **pFile)
{
    TODO("GeekOS filesystem open operation");
}

/*
 * Create a directory named by given path.
 */
static int GOSFS_Create_Directory(struct Mount_Point *mountPoint, const char *path)
{
    TODO("GeekOS filesystem create directory operation");
}

/*
 * Open a directory named by given path.
 */
static int GOSFS_Open_Directory(struct Mount_Point *mountPoint, const char *path, struct File **pDir)
{
    TODO("GeekOS filesystem open directory operation");
}

/*
 * Open a directory named by given path.
 */
static int GOSFS_Delete(struct Mount_Point *mountPoint, const char *path)
{
    TODO("GeekOS filesystem delete operation");
}

/*
 * Get metadata (size, permissions, etc.) of file named by given path.
 */
static int GOSFS_Stat(struct Mount_Point *mountPoint, const char *path, struct VFS_File_Stat *stat)
{
    TODO("GeekOS filesystem stat operation");
}

/*
 * Synchronize the filesystem data with the disk
 * (i.e., flush out all buffered filesystem data).
 */
static int GOSFS_Sync(struct Mount_Point *mountPoint)
{
    TODO("GeekOS filesystem sync operation");
}

/*static*/ struct Mount_Point_Ops s_gosfsMountPointOps = {
    &GOSFS_Open,
    &GOSFS_Create_Directory,
    &GOSFS_Open_Directory,
    &GOSFS_Stat,
    &GOSFS_Sync,
    &GOSFS_Delete,
};

static int GOSFS_Format(struct Block_Device *blockDev)
{
    TODO("GeekOS filesystem format operation");
}

static int GOSFS_Mount(struct Mount_Point *mountPoint)
{
    TODO("GeekOS filesystem mount operation");
}

static struct Filesystem_Ops s_gosfsFilesystemOps = {
    &GOSFS_Format,
    &GOSFS_Mount,
};

/* ----------------------------------------------------------------------
 * Public functions
 * ---------------------------------------------------------------------- */

void Init_GOSFS(void)
{
    Register_Filesystem("gosfs", &s_gosfsFilesystemOps);
}