128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2015 Josef Gajdusek
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "extmod/vfs.h"
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#include "py/mperrno.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "shared-bindings/storage/__init__.h"
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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) {
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if (vfs == MP_VFS_NONE) {
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// mount point not found
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mp_raise_OSError(MP_ENODEV);
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}
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if (vfs == MP_VFS_ROOT) {
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// can't do operation on root dir
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mp_raise_OSError(MP_EPERM);
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}
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mp_obj_t meth[n_args + 2];
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mp_load_method(vfs->obj, meth_name, meth);
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if (args != NULL) {
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memcpy(meth + 2, args, n_args * sizeof(*args));
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}
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return mp_call_method_n_kw(n_args, 0, meth);
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}
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void common_hal_storage_mount(mp_obj_t vfs_obj, const char* mount_path, bool readonly) {
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// create new object
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mp_vfs_mount_t *vfs = m_new_obj(mp_vfs_mount_t);
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vfs->str = mount_path;
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vfs->len = strlen(mount_path);
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vfs->obj = vfs_obj;
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vfs->next = NULL;
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mp_obj_t args[2];
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args[0] = readonly ? mp_const_true : mp_const_false;
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args[1] = mp_const_false; // Don't make the file system automatically when mounting.
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// call the underlying object to do any mounting operation
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mp_vfs_proxy_call(vfs, MP_QSTR_mount, 2, (mp_obj_t*)&args);
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// check that the destination mount point is unused
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const char *path_out;
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mp_vfs_mount_t *existing_mount = mp_vfs_lookup_path(mount_path, &path_out);
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if (existing_mount != MP_VFS_NONE && existing_mount != MP_VFS_ROOT) {
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if (vfs->len != 1 && existing_mount->len == 1) {
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// if root dir is mounted, still allow to mount something within a subdir of root
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} else {
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// mount point in use
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mp_raise_OSError(MP_EPERM);
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}
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}
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// Insert the vfs into the mount table by pushing it onto the front of the
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// mount table.
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mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table);
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vfs->next = *vfsp;
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*vfsp = vfs;
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}
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void common_hal_storage_umount_object(mp_obj_t vfs_obj) {
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// remove vfs from the mount table
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mp_vfs_mount_t *vfs = NULL;
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for (mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table); *vfsp != NULL; vfsp = &(*vfsp)->next) {
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if ((*vfsp)->obj == vfs_obj) {
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vfs = *vfsp;
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*vfsp = (*vfsp)->next;
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break;
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}
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}
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if (vfs == NULL) {
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mp_raise_OSError(MP_EINVAL);
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}
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// if we unmounted the current device then set current to root
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if (MP_STATE_VM(vfs_cur) == vfs) {
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MP_STATE_VM(vfs_cur) = MP_VFS_ROOT;
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}
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// call the underlying object to do any unmounting operation
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mp_vfs_proxy_call(vfs, MP_QSTR_umount, 0, NULL);
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}
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void common_hal_storage_umount_path(const char* mount_path) {
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// remove vfs from the mount table
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mp_obj_t *vfs_obj = NULL;
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for (mp_vfs_mount_t **vfsp = &MP_STATE_VM(vfs_mount_table); *vfsp != NULL; vfsp = &(*vfsp)->next) {
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if (strcmp(mount_path, (*vfsp)->str) == 0) {
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vfs_obj = (*vfsp)->obj;
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break;
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}
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}
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if (vfs_obj == NULL) {
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mp_raise_OSError(MP_EINVAL);
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}
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common_hal_storage_umount_object(vfs_obj);
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}
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