开RT_DFS_ELM_REENTRANT导致文件不能创建

fd=open(file_name,O_RDWR|O_CREAT,0);这句会在

int ff_req_grant(_SYNC_t m)
{
    if (rt_mutex_take(m, _FS_TIMEOUT) == RT_EOK)
        return RT_TRUE;

    return RT_FALSE;
}

/* The _FS_REENTRANT option switches the reentrancy (thread safe) of the FatFs module.
/
/   0: Disable reentrancy. _SYNC_t and _FS_TIMEOUT have no effect.
/   1: Enable reentrancy. Also user provided synchronization handlers,
/      ff_req_grant, ff_rel_grant, ff_del_syncobj and ff_cre_syncobj
/      function must be added to the project. */

static
FRESULT validate (	/* FR_OK(0): The object is valid, !=0: Invalid */
	FATFS *fs,		/* Pointer to the file system object */
	WORD id			/* Member id of the target object to be checked */
)
{
	if (!fs || !fs->fs_type || fs->id != id)
		return FR_INVALID_OBJECT;

	ENTER_FF(fs);		/* Lock file system */

	if (disk_status(fs->drv) & STA_NOINIT)
		return FR_NOT_READY;

	return FR_OK;
}

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