Function dfs_init

components/dfs/dfs_v1/src/dfs.c:48–106

* this function will initialize device file system. */

 * this function will initialize device file system.
 */
int dfs_init(void)
{
    static rt_bool_t init_ok = RT_FALSE;

    if (init_ok)
    {
        rt_kprintf("dfs already init.\n");
        return 0;
    }

    /* init vnode hash table */
    dfs_vnode_mgr_init();

    /* clear filesystem operations table */
    rt_memset((void *)filesystem_operation_table, 0, sizeof(filesystem_operation_table));
    /* clear filesystem table */
    rt_memset(filesystem_table, 0, sizeof(filesystem_table));
    /* clean fd table */
    rt_memset(&_fdtab, 0, sizeof(_fdtab));

    /* create device filesystem lock */
    rt_mutex_init(&fslock, "fslock", RT_IPC_FLAG_PRIO);
    rt_mutex_init(&fdlock, "fdlock", RT_IPC_FLAG_PRIO);

#ifdef DFS_USING_WORKDIR
    /* set current working directory */
    rt_memset(working_directory, 0, sizeof(working_directory));
    working_directory[0] = '/';
#endif

#ifdef RT_USING_DFS_TMPFS
    {
        extern int dfs_tmpfs_init(void);
        dfs_tmpfs_init();
    }
#endif

#ifdef RT_USING_DFS_DEVFS
    {
        extern int devfs_init(void);

        /* if enable devfs, initialize and mount it as soon as possible */
        devfs_init();

        dfs_mount(NULL, "/dev", "devfs", 0, 0);
    }
#if defined(RT_USING_DEV_BUS) && defined(RT_USING_DFS_TMPFS)
    mkdir("/dev/shm", 0x777);
    if (dfs_mount(RT_NULL, "/dev/shm", "tmp", 0, 0) != 0)
    {
        rt_kprintf("Dir /dev/shm mount failed!\n");
    }
#endif
#endif

    init_ok = RT_TRUE;

    return 0;