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authorRaghuram Subramani <raghus2247@gmail.com>2022-06-19 19:47:51 +0530
committerRaghuram Subramani <raghus2247@gmail.com>2022-06-19 19:47:51 +0530
commit4fd287655a72b9aea14cdac715ad5b90ed082ed2 (patch)
tree65d393bc0e699dd12d05b29ba568e04cea666207 /circuitpython/extmod/vfs.c
parent0150f70ce9c39e9e6dd878766c0620c85e47bed0 (diff)
add circuitpython code
Diffstat (limited to 'circuitpython/extmod/vfs.c')
-rw-r--r--circuitpython/extmod/vfs.c518
1 files changed, 518 insertions, 0 deletions
diff --git a/circuitpython/extmod/vfs.c b/circuitpython/extmod/vfs.c
new file mode 100644
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--- /dev/null
+++ b/circuitpython/extmod/vfs.c
@@ -0,0 +1,518 @@
+// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
+// SPDX-FileCopyrightText: Copyright (c) 2017 Damien P. George
+//
+// SPDX-License-Identifier: MIT
+
+#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 defined(MICROPY_VFS_POSIX) && MICROPY_VFS_POSIX
+#include "extmod/vfs_posix.h"
+#endif
+
+// 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') {
+ // 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') {
+ *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;
+ *path_out = mp_const_none;
+ 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_vfs_proto_t *)mp_proto_get(MP_QSTR_protocol_vfs, vfs->obj);
+ 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) {
+ // The superblock for littlefs is in both block 0 and 1, but block 0 may be erased
+ // or partially written, so search both blocks 0 and 1 for the littlefs signature.
+ mp_vfs_blockdev_t blockdev;
+ mp_vfs_blockdev_init(&blockdev, bdev_obj);
+ uint8_t buf[44];
+ for (size_t block_num = 0; block_num <= 1; ++block_num) {
+ mp_vfs_blockdev_read_ext(&blockdev, block_num, 8, sizeof(buf), buf);
+ #if MICROPY_VFS_LFS1
+ if (memcmp(&buf[32], "littlefs", 8) == 0) {
+ // LFS1
+ mp_obj_t 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
+ mp_obj_t 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
+
+ // no filesystem found
+ mp_raise_OSError(MP_ENODEV);
+}
+
+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;
+ 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);
+ }
+ 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 defined(MICROPY_VFS_POSIX) && 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);
+ 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);
+
+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_const_none;
+ 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_const_none;
+ 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);
+ }
+ 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;
+ mp_vfs_mount_t *vfs = lookup_path(path_in, &path_out);
+ 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);
+ }
+ 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);
+ 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