/*****************************************************************************
 * Copyright (c) 2019, Nations Technologies Inc.
 *
 * All rights reserved.
 * ****************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Nations' name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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 * ****************************************************************************/

/**
 * @file dfs_fs.h
 * @author Nations
 * @version v1.0.0
 *
 * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
 */

#ifndef __DFS_FS_H__
#define __DFS_FS_H__

#include <dfs.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Pre-declaration */
struct dfs_filesystem;
struct dfs_fd;

/* File system operations */
struct dfs_filesystem_ops
{
    char *name;
    uint32_t flags;      /* flags for file system operations */

    /* operations for file */
    const struct dfs_file_ops *fops;

    /* mount and unmount file system */
    int (*mount)    (struct dfs_filesystem *fs, unsigned long rwflag, const void *data);
    int (*unmount)  (struct dfs_filesystem *fs);

    /* make a file system */
    int (*mkfs)     (rt_device_t devid);
    int (*statfs)   (struct dfs_filesystem *fs, struct statfs *buf);

    int (*unlink)   (struct dfs_filesystem *fs, const char *pathname);
    int (*stat)     (struct dfs_filesystem *fs, const char *filename, struct stat *buf);
    int (*rename)   (struct dfs_filesystem *fs, const char *oldpath, const char *newpath);
};

/* Mounted file system */
struct dfs_filesystem
{
    rt_device_t dev_id;     /* Attached device */

    char *path;             /* File system mount point */
    const struct dfs_filesystem_ops *ops; /* Operations for file system type */

    void *data;             /* Specific file system data */
};

/* file system partition table */
struct dfs_partition
{
    uint8_t type;        /* file system type */
    off_t  offset;       /* partition start offset */
    size_t size;         /* partition size */
    rt_sem_t lock;
};

/* mount table */
struct dfs_mount_tbl
{
    const char   *device_name;
    const char   *path;
    const char   *filesystemtype;
    unsigned long rwflag;
    const void   *data;
};

int dfs_register(const struct dfs_filesystem_ops *ops);
struct dfs_filesystem *dfs_filesystem_lookup(const char *path);
const char *dfs_filesystem_get_mounted_path(struct rt_device *device);

int dfs_filesystem_get_partition(struct dfs_partition *part,
                                 uint8_t         *buf,
                                 uint32_t        pindex);

int dfs_mount(const char *device_name,
              const char *path,
              const char *filesystemtype,
              unsigned long rwflag,
              const void *data);
int dfs_unmount(const char *specialfile);

int dfs_mkfs(const char *fs_name, const char *device_name);
int dfs_statfs(const char *path, struct statfs *buffer);
int dfs_mount_device(rt_device_t dev);

#ifdef __cplusplus
}
#endif

#endif