/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Damien P. George
 * Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdint.h>
#include <string.h>

#include "py/runtime.h"
#include "py/objstr.h"
#include "py/mperrno.h"
#include "extmod/vfs.h"

#if MICROPY_VFS

#if MICROPY_VFS_FAT
#include "extmod/vfs_fat.h"
#endif

#if MICROPY_VFS_LFS1 || MICROPY_VFS_LFS2
#include "extmod/vfs_lfs.h"
#endif

#if MICROPY_VFS_POSIX
#include "extmod/vfs_posix.h"
#endif

#include "helios_debug.h"

#define QPY_FS_LOG(msg, ...) custom_log(Fs, msg, ##__VA_ARGS__)

//Kenney.wang 20201228 vfs readonly 
#if 1
#define mp_vfs_log(fmt, ...)	 custom_log(QPY_LFS, fmt, ##__VA_ARGS__)
#else
#define mp_vfs_log(fmt, ...)
#endif
#define DEFINE_BACKUP_FS "/bak"
#define MP_VFS_READONIY_ENABLE 1
#define MP_VFS_READONIY_DISABLE 0

#define MP_VFS_READONIY_MODE 1
char vfs_readonly_mode = MP_VFS_READONIY_MODE;
//Kenney.wang 20201228 vfs readonly 

// For mp_vfs_proxy_call, the maximum number of additional args that can be passed.
// A fixed maximum size is used to avoid the need for a costly variable array.
#define PROXY_MAX_ARGS (2)

// path is the path to lookup and *path_out holds the path within the VFS
// object (starts with / if an absolute path).
// Returns MP_VFS_ROOT for root dir (and then path_out is undefined) and
// MP_VFS_NONE for path not found.
mp_vfs_mount_t *mp_vfs_lookup_path(const char *path, const char **path_out) {
 if (*path == '/' || MP_STATE_VM(vfs_cur) == MP_VFS_ROOT) {
 // an absolute path, or the current volume is root, so search root dir
 bool is_abs = 0;
 if (*path == '/') {
 ++path;
 is_abs = 1;
 }
 if (*path == '0円') {
 // path is "" or "/" so return virtual root
 return MP_VFS_ROOT;
 }
 for (mp_vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
 size_t len = vfs->len - 1;
 if (len == 0) {
 *path_out = path - is_abs;
 return vfs;
 }
 if (strncmp(path, vfs->str + 1, len) == 0) {
 if (path[len] == '/') {
 *path_out = path + len;
 return vfs;
 } else if (path[len] == '0円') {
 *path_out = "/";
 return vfs;
 }
 }
 }

 // if we get here then there's nothing mounted on /, so the path doesn't exist
 return MP_VFS_NONE;
 }

 // a relative path within a mounted device
 *path_out = path;
 return MP_STATE_VM(vfs_cur);
}

// Version of mp_vfs_lookup_path that takes and returns uPy string objects.
STATIC mp_vfs_mount_t *lookup_path(mp_obj_t path_in, mp_obj_t *path_out) {
 const char *path = mp_obj_str_get_str(path_in);
 const char *p_out;
 mp_vfs_mount_t *vfs = mp_vfs_lookup_path(path, &p_out);
 if (vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) {
 *path_out = mp_obj_new_str_of_type(mp_obj_get_type(path_in),
 (const byte *)p_out, strlen(p_out));
 }
 return vfs;
}

STATIC mp_obj_t mp_vfs_proxy_call(mp_vfs_mount_t *vfs, qstr meth_name, size_t n_args, const mp_obj_t *args) {
 assert(n_args <= PROXY_MAX_ARGS);
 if (vfs == MP_VFS_NONE) {
 // mount point not found
 mp_raise_OSError(MP_ENODEV);
 }
 if (vfs == MP_VFS_ROOT) {
 // can't do operation on root dir
 mp_raise_OSError(MP_EPERM);
 }
 mp_obj_t meth[2 + PROXY_MAX_ARGS];
 mp_load_method(vfs->obj, meth_name, meth);
 if (args != NULL) {
 memcpy(meth + 2, args, n_args * sizeof(*args));
 }
 return mp_call_method_n_kw(n_args, 0, meth);
}

mp_import_stat_t mp_vfs_import_stat(const char *path) {
 const char *path_out;
 mp_vfs_mount_t *vfs = mp_vfs_lookup_path(path, &path_out);
 if (vfs == MP_VFS_NONE || vfs == MP_VFS_ROOT) {
 return MP_IMPORT_STAT_NO_EXIST;
 }

 // If the mounted object has the VFS protocol, call its import_stat helper
 const mp_vfs_proto_t *proto = mp_obj_get_type(vfs->obj)->protocol;
 if (proto != NULL) {
 return proto->import_stat(MP_OBJ_TO_PTR(vfs->obj), path_out);
 }

 // delegate to vfs.stat() method
 mp_obj_t path_o = mp_obj_new_str(path_out, strlen(path_out));
 mp_obj_t stat;
 nlr_buf_t nlr;
 if (nlr_push(&nlr) == 0) {
 stat = mp_vfs_proxy_call(vfs, MP_QSTR_stat, 1, &path_o);
 nlr_pop();
 } else {
 // assume an exception means that the path is not found
 return MP_IMPORT_STAT_NO_EXIST;
 }
 mp_obj_t *items;
 mp_obj_get_array_fixed_n(stat, 10, &items);
 mp_int_t st_mode = mp_obj_get_int(items[0]);
 if (st_mode & MP_S_IFDIR) {
 return MP_IMPORT_STAT_DIR;
 } else {
 return MP_IMPORT_STAT_FILE;
 }
}

STATIC mp_obj_t mp_vfs_autodetect(mp_obj_t bdev_obj) {
 #if MICROPY_VFS_LFS1 || MICROPY_VFS_LFS2
 nlr_buf_t nlr;
 if (nlr_push(&nlr) == 0) {
 mp_obj_t vfs = MP_OBJ_NULL;
 mp_vfs_blockdev_t blockdev;
 mp_vfs_blockdev_init(&blockdev, bdev_obj);
 uint8_t buf[44];
 mp_vfs_blockdev_read_ext(&blockdev, 0, 8, sizeof(buf), buf);
 #if MICROPY_VFS_LFS1
 if (memcmp(&buf[32], "littlefs", 8) == 0) {
 // LFS1
 vfs = mp_type_vfs_lfs1.make_new(&mp_type_vfs_lfs1, 1, 0, &bdev_obj);
 nlr_pop();
 return vfs;
 }
 #endif
 #if MICROPY_VFS_LFS2
 if (memcmp(&buf[0], "littlefs", 8) == 0) {
 // LFS2
 vfs = mp_type_vfs_lfs2.make_new(&mp_type_vfs_lfs2, 1, 0, &bdev_obj);
 nlr_pop();
 return vfs;
 }
 #endif
 nlr_pop();
 } else {
 // Ignore exception (eg block device doesn't support extended readblocks)
 }
 #endif

 #if MICROPY_VFS_FAT
 return mp_fat_vfs_type.make_new(&mp_fat_vfs_type, 1, 0, &bdev_obj);
 #endif

 return bdev_obj;
}

mp_obj_t mp_vfs_mount(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
 enum { ARG_readonly, ARG_mkfs };
 static const mp_arg_t allowed_args[] = {
 { MP_QSTR_readonly, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_FALSE} },
 { MP_QSTR_mkfs, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_FALSE} },
 };

 // parse args
 mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
 mp_arg_parse_all(n_args - 2, pos_args + 2, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

 // get the mount point
 size_t mnt_len;
 const char *mnt_str = mp_obj_str_get_data(pos_args[1], &mnt_len);

 // see if we need to auto-detect and create the filesystem
 mp_obj_t vfs_obj = pos_args[0];
 mp_obj_t dest[2];
 mp_load_method_maybe(vfs_obj, MP_QSTR_mount, dest);
 if (dest[0] == MP_OBJ_NULL) {
 // Input object has no mount method, assume it's a block device and try to
 // auto-detect the filesystem and create the corresponding VFS entity.
 vfs_obj = mp_vfs_autodetect(vfs_obj);
 }

 // create new object
 mp_vfs_mount_t *vfs = m_new_obj(mp_vfs_mount_t);
 vfs->str = mnt_str;
 vfs->len = mnt_len;
 vfs->obj = vfs_obj;
	
	//Kenney.wang 20201228 vfs readonly 
	if(!strcmp(mnt_str, DEFINE_BACKUP_FS))
	{
		vfs->readonly = MP_VFS_READONIY_ENABLE;
		mp_vfs_log("%s readonly: %d \r\n", vfs->str, vfs->readonly);
	}
	else
	{
		vfs->readonly = MP_VFS_READONIY_DISABLE;
		mp_vfs_log("%s readonly: %d \r\n", vfs->str, vfs->readonly);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 vfs->next = NULL;

 // call the underlying object to do any mounting operation
 mp_vfs_proxy_call(vfs, MP_QSTR_mount, 2, (mp_obj_t *)&args);

 // check that the destination mount point is unused
 const char *path_out;
 mp_vfs_mount_t *existing_mount = mp_vfs_lookup_path(mp_obj_str_get_str(pos_args[1]), &path_out);
 if (existing_mount != MP_VFS_NONE && existing_mount != MP_VFS_ROOT) {
 if (vfs->len != 1 && existing_mount->len == 1) {
 // if root dir is mounted, still allow to mount something within a subdir of root
 } else {
 // mount point in use
 mp_raise_OSError(MP_EPERM);
 }
 }

 // insert the vfs into the mount table
 mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table);
 while (*vfsp != NULL) {
 if ((*vfsp)->len == 1) {
 // make sure anything mounted at the root stays at the end of the list
 vfs->next = *vfsp;
 break;
 }
 vfsp = &(*vfsp)->next;
 }
 *vfsp = vfs;

 return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_vfs_mount_obj, 2, mp_vfs_mount);

mp_obj_t mp_vfs_umount(mp_obj_t mnt_in) {
 // remove vfs from the mount table
 mp_vfs_mount_t *vfs = NULL;
 size_t mnt_len;
 const char *mnt_str = NULL;
 if (mp_obj_is_str(mnt_in)) {
 mnt_str = mp_obj_str_get_data(mnt_in, &mnt_len);
 }
	
	//Kenney.wang 20201228 vfs readonly 
	if(!strcmp(mnt_str, DEFINE_BACKUP_FS) && vfs_readonly_mode)
	{
		mp_vfs_log("readonly\r\n");
		return mp_obj_new_int(-1);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 for (mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table); *vfsp != NULL; vfsp = &(*vfsp)->next) {
 if ((mnt_str != NULL && !memcmp(mnt_str, (*vfsp)->str, mnt_len + 1)) || (*vfsp)->obj == mnt_in) {
 vfs = *vfsp;
 *vfsp = (*vfsp)->next;
 break;
 }
 }

 if (vfs == NULL) {
 mp_raise_OSError(MP_EINVAL);
 }

 // if we unmounted the current device then set current to root
 if (MP_STATE_VM(vfs_cur) == vfs) {
 MP_STATE_VM(vfs_cur) = MP_VFS_ROOT;
 }

 // call the underlying object to do any unmounting operation
 mp_vfs_proxy_call(vfs, MP_QSTR_umount, 0, NULL);

 return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_umount_obj, mp_vfs_umount);

// Note: buffering and encoding args are currently ignored
mp_obj_t mp_vfs_open(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
 enum { ARG_file, ARG_mode, ARG_encoding };
 static const mp_arg_t allowed_args[] = {
 { MP_QSTR_file, MP_ARG_OBJ | MP_ARG_REQUIRED, {.u_rom_obj = MP_ROM_NONE} },
 { MP_QSTR_mode, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_QSTR(MP_QSTR_r)} },
 { MP_QSTR_buffering, MP_ARG_INT, {.u_int = -1} },
 { MP_QSTR_encoding, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
 };

 // parse args
 mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
 mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

 #if MICROPY_VFS_POSIX
 // If the file is an integer then delegate straight to the POSIX handler
 if (mp_obj_is_small_int(args[ARG_file].u_obj)) {
 return mp_vfs_posix_file_open(&mp_type_textio, args[ARG_file].u_obj, args[ARG_mode].u_obj);
 }
 #endif

 mp_vfs_mount_t *vfs = lookup_path(args[ARG_file].u_obj, &args[ARG_file].u_obj);

	//Kenney.wang 20201228 vfs readonly 
	const char *file_path = mp_obj_str_get_str(args[ARG_file].u_obj);
	const char *mode_s = mp_obj_str_get_str(args[ARG_mode].u_obj);
	mp_vfs_log("mp_vfs_open[%s] mode:%s \r\n", file_path, mode_s);
	if((vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) && vfs->readonly == MP_VFS_READONIY_ENABLE && vfs_readonly_mode)
	{
		if(strcmp(mode_s, "r") && strcmp(mode_s, "rt") && strcmp(mode_s, "rb"))
		{
			mp_vfs_log("%s readonly[%d]\r\n", file_path, vfs->readonly);
			return mp_obj_new_int(-1);
		}
	}
	//Kenney.wang 20201228 vfs readonly 
	
 return mp_vfs_proxy_call(vfs, MP_QSTR_open, 2, (mp_obj_t *)&args);
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_vfs_open_obj, 0, mp_vfs_open);

mp_obj_t mp_vfs_chdir(mp_obj_t path_in) {
 mp_obj_t path_out;

 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
 if (vfs == MP_VFS_ROOT) {
 // If we change to the root dir and a VFS is mounted at the root then
 // we must change that VFS's current dir to the root dir so that any
 // subsequent relative paths begin at the root of that VFS.
 for (vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
 if (vfs->len == 1) {
 mp_obj_t root = MP_OBJ_NEW_QSTR(MP_QSTR__slash_);
 mp_vfs_proxy_call(vfs, MP_QSTR_chdir, 1, &root);
 break;
 }
 }
 vfs = MP_VFS_ROOT;
 } else {
 mp_vfs_proxy_call(vfs, MP_QSTR_chdir, 1, &path_out);
 }
 MP_STATE_VM(vfs_cur) = vfs;
 return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_chdir_obj, mp_vfs_chdir);

mp_obj_t mp_vfs_getcwd(void) {
 if (MP_STATE_VM(vfs_cur) == MP_VFS_ROOT) {
 return MP_OBJ_NEW_QSTR(MP_QSTR__slash_);
 }
 mp_obj_t cwd_o = mp_vfs_proxy_call(MP_STATE_VM(vfs_cur), MP_QSTR_getcwd, 0, NULL);
 if (MP_STATE_VM(vfs_cur)->len == 1) {
 // don't prepend "/" for vfs mounted at root
 return cwd_o;
 }
 const char *cwd = mp_obj_str_get_str(cwd_o);
 vstr_t vstr;
 vstr_init(&vstr, MP_STATE_VM(vfs_cur)->len + strlen(cwd) + 1);
 vstr_add_strn(&vstr, MP_STATE_VM(vfs_cur)->str, MP_STATE_VM(vfs_cur)->len);
 if (!(cwd[0] == '/' && cwd[1] == 0)) {
 vstr_add_str(&vstr, cwd);
 }
 return mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_vfs_getcwd_obj, mp_vfs_getcwd);

typedef struct _mp_vfs_ilistdir_it_t {
 mp_obj_base_t base;
 mp_fun_1_t iternext;
 union {
 mp_vfs_mount_t *vfs;
 mp_obj_t iter;
 } cur;
 bool is_str;
 bool is_iter;
} mp_vfs_ilistdir_it_t;

STATIC mp_obj_t mp_vfs_ilistdir_it_iternext(mp_obj_t self_in) {
 mp_vfs_ilistdir_it_t *self = MP_OBJ_TO_PTR(self_in);
 if (self->is_iter) {
 // continue delegating to root dir
 return mp_iternext(self->cur.iter);
 } else if (self->cur.vfs == NULL) {
 // finished iterating mount points and no root dir is mounted
 return MP_OBJ_STOP_ITERATION;
 } else {
 // continue iterating mount points
 mp_vfs_mount_t *vfs = self->cur.vfs;
 self->cur.vfs = vfs->next;
 if (vfs->len == 1) {
 // vfs is mounted at root dir, delegate to it
 mp_obj_t root = MP_OBJ_NEW_QSTR(MP_QSTR__slash_);
 self->is_iter = true;
 self->cur.iter = mp_vfs_proxy_call(vfs, MP_QSTR_ilistdir, 1, &root);
 return mp_iternext(self->cur.iter);
 } else {
 // a mounted directory
 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(3, NULL));
 t->items[0] = mp_obj_new_str_of_type(
 self->is_str ? &mp_type_str : &mp_type_bytes,
 (const byte *)vfs->str + 1, vfs->len - 1);
 t->items[1] = MP_OBJ_NEW_SMALL_INT(MP_S_IFDIR);
 t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // no inode number
 return MP_OBJ_FROM_PTR(t);
 }
 }
}

mp_obj_t mp_vfs_ilistdir(size_t n_args, const mp_obj_t *args) {
 mp_obj_t path_in;
 if (n_args == 1) {
 path_in = args[0];
 } else {
 path_in = MP_OBJ_NEW_QSTR(MP_QSTR_);
 }

 mp_obj_t path_out;
 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);

 if (vfs == MP_VFS_ROOT) {
 // list the root directory
 mp_vfs_ilistdir_it_t *iter = m_new_obj(mp_vfs_ilistdir_it_t);
 iter->base.type = &mp_type_polymorph_iter;
 iter->iternext = mp_vfs_ilistdir_it_iternext;
 iter->cur.vfs = MP_STATE_VM(vfs_mount_table);
 iter->is_str = mp_obj_get_type(path_in) == &mp_type_str;
 iter->is_iter = false;
 return MP_OBJ_FROM_PTR(iter);
 }

 return mp_vfs_proxy_call(vfs, MP_QSTR_ilistdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_ilistdir_obj, 0, 1, mp_vfs_ilistdir);

mp_obj_t mp_vfs_listdir(size_t n_args, const mp_obj_t *args) {
 mp_obj_t iter = mp_vfs_ilistdir(n_args, args);
 mp_obj_t dir_list = mp_obj_new_list(0, NULL);
 mp_obj_t next;
 while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
 mp_obj_list_append(dir_list, mp_obj_subscr(next, MP_OBJ_NEW_SMALL_INT(0), MP_OBJ_SENTINEL));
 }
 return dir_list;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_vfs_listdir_obj, 0, 1, mp_vfs_listdir);

mp_obj_t mp_vfs_mkdir(mp_obj_t path_in) {
 mp_obj_t path_out;

	mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
 if (vfs == MP_VFS_ROOT || (vfs != MP_VFS_NONE && !strcmp(mp_obj_str_get_str(path_out), "/"))) {
 mp_raise_OSError(MP_EEXIST);
 }
	
	//Kenney.wang 20201228 vfs readonly 
	if((vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) && vfs->readonly == MP_VFS_READONIY_ENABLE && vfs_readonly_mode)
	{
		mp_vfs_log("readonly[%d]\r\n", vfs->readonly);
		return mp_obj_new_int(-1);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 return mp_vfs_proxy_call(vfs, MP_QSTR_mkdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_mkdir_obj, mp_vfs_mkdir);

mp_obj_t mp_vfs_remove(mp_obj_t path_in) {
 mp_obj_t path_out;
	const char *path = mp_obj_str_get_str(path_in);

 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
	
	//Kenney.wang 20201228 vfs readonly 
	if((vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) && vfs->readonly == MP_VFS_READONIY_ENABLE && vfs_readonly_mode)
	{
		mp_vfs_log("readonly[%d]\r\n", vfs->readonly);
		return mp_obj_new_int(-1);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 return mp_vfs_proxy_call(vfs, MP_QSTR_remove, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_remove_obj, mp_vfs_remove);

mp_obj_t mp_vfs_rename(mp_obj_t old_path_in, mp_obj_t new_path_in) {
 mp_obj_t args[2];

 mp_vfs_mount_t *old_vfs = lookup_path(old_path_in, &args[0]);
 mp_vfs_mount_t *new_vfs = lookup_path(new_path_in, &args[1]);
 if (old_vfs != new_vfs) {
 // can't rename across filesystems
 mp_raise_OSError(MP_EPERM);
 }

	//Kenney.wang 20201228 vfs readonly 
	if((old_vfs != MP_VFS_NONE && old_vfs != MP_VFS_ROOT) && old_vfs->readonly == MP_VFS_READONIY_ENABLE && vfs_readonly_mode)
	{
		mp_vfs_log("readonly[%d]\r\n", old_vfs->readonly);
		return mp_obj_new_int(-1);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 return mp_vfs_proxy_call(old_vfs, MP_QSTR_rename, 2, args);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_vfs_rename_obj, mp_vfs_rename);

mp_obj_t mp_vfs_rmdir(mp_obj_t path_in) {
 mp_obj_t path_out;
 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);

	//Kenney.wang 20201228 vfs readonly 
	if((vfs != MP_VFS_NONE && vfs != MP_VFS_ROOT) && vfs->readonly == MP_VFS_READONIY_ENABLE && vfs_readonly_mode)
	{
		mp_vfs_log("readonly[%d]\r\n", vfs->readonly);
		return mp_obj_new_int(-1);
	}
	//Kenney.wang 20201228 vfs readonly 
	
 return mp_vfs_proxy_call(vfs, MP_QSTR_rmdir, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_rmdir_obj, mp_vfs_rmdir);

mp_obj_t mp_vfs_stat(mp_obj_t path_in) {
 mp_obj_t path_out;
 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
 if (vfs == MP_VFS_ROOT) {
 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
 t->items[0] = MP_OBJ_NEW_SMALL_INT(MP_S_IFDIR); // st_mode
 for (int i = 1; i <= 9; ++i) {
 t->items[i] = MP_OBJ_NEW_SMALL_INT(0); // dev, nlink, uid, gid, size, atime, mtime, ctime
 }
 return MP_OBJ_FROM_PTR(t);
 }
 return mp_vfs_proxy_call(vfs, MP_QSTR_stat, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_stat_obj, mp_vfs_stat);

mp_obj_t mp_vfs_statvfs(mp_obj_t path_in) {
 mp_obj_t path_out;
 mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
 if (vfs == MP_VFS_ROOT) {
 // statvfs called on the root directory, see if there's anything mounted there
 for (vfs = MP_STATE_VM(vfs_mount_table); vfs != NULL; vfs = vfs->next) {
 if (vfs->len == 1) {
 break;
 }
 }

 // If there's nothing mounted at root then return a mostly-empty tuple
 if (vfs == NULL) {
 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));

 // fill in: bsize, frsize, blocks, bfree, bavail, files, ffree, favail, flags
 for (int i = 0; i <= 8; ++i) {
 t->items[i] = MP_OBJ_NEW_SMALL_INT(0);
 }

 // Put something sensible in f_namemax
 t->items[9] = MP_OBJ_NEW_SMALL_INT(MICROPY_ALLOC_PATH_MAX);

 return MP_OBJ_FROM_PTR(t);
 }

 // VFS mounted at root so delegate the call to it
 path_out = MP_OBJ_NEW_QSTR(MP_QSTR__slash_);
 }
 return mp_vfs_proxy_call(vfs, MP_QSTR_statvfs, 1, &path_out);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_vfs_statvfs_obj, mp_vfs_statvfs);

// This is a C-level helper function for ports to use if needed.
int mp_vfs_mount_and_chdir_protected(mp_obj_t bdev, mp_obj_t mount_point) {
 nlr_buf_t nlr;
 mp_int_t ret = -MP_EIO;
 if (nlr_push(&nlr) == 0) {
 mp_obj_t args[] = { bdev, mount_point };
 mp_vfs_mount(2, args, (mp_map_t *)&mp_const_empty_map);
 mp_vfs_chdir(mount_point);
 ret = 0; // success
 nlr_pop();
 } else {
 mp_obj_base_t *exc = nlr.ret_val;
 if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(exc->type), MP_OBJ_FROM_PTR(&mp_type_OSError))) {
 mp_obj_t v = mp_obj_exception_get_value(MP_OBJ_FROM_PTR(exc));
 mp_obj_get_int_maybe(v, &ret); // get errno value
 ret = -ret;
 }
 }
 return ret;
}

#endif // MICROPY_VFS