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| 1 | +/* |
| 2 | + * This file is part of the Micro Python project, http://micropython.org/ |
| 3 | + * |
| 4 | + * The MIT License (MIT) |
| 5 | + * |
| 6 | + * Copyright (c) 2014 Damien P. George |
| 7 | + * |
| 8 | + * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | + * of this software and associated documentation files (the "Software"), to deal |
| 10 | + * in the Software without restriction, including without limitation the rights |
| 11 | + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | + * copies of the Software, and to permit persons to whom the Software is |
| 13 | + * furnished to do so, subject to the following conditions: |
| 14 | + * |
| 15 | + * The above copyright notice and this permission notice shall be included in |
| 16 | + * all copies or substantial portions of the Software. |
| 17 | + * |
| 18 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 21 | + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 24 | + * THE SOFTWARE. |
| 25 | + */ |
| 26 | + |
| 27 | +#include "mpconfig.h" |
| 28 | +#include "misc.h" |
| 29 | +#include "nlr.h" |
| 30 | +#include "qstr.h" |
| 31 | +#include "obj.h" |
| 32 | +#include "runtime.h" |
| 33 | +#include "ff.h" |
| 34 | +#include "fsusermount.h" |
| 35 | + |
| 36 | +// for user-mountable block device |
| 37 | +fs_user_mount_t *fs_user_mount; |
| 38 | + |
| 39 | +STATIC mp_obj_t pyb_mount(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { |
| 40 | + static const mp_arg_t allowed_args[] = { |
| 41 | + { MP_QSTR_readonly, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} }, |
| 42 | + { MP_QSTR_mkfs, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} }, |
| 43 | + }; |
| 44 | + |
| 45 | + // parse args |
| 46 | + mp_obj_t device = pos_args[0]; |
| 47 | + mp_obj_t mount_point = pos_args[1]; |
| 48 | + mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; |
| 49 | + mp_arg_parse_all(n_args - 2, pos_args + 2, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); |
| 50 | + |
| 51 | + // get the mount point |
| 52 | + mp_uint_t mnt_len; |
| 53 | + const char *mnt_str = mp_obj_str_get_data(mount_point, &mnt_len); |
| 54 | + |
| 55 | + if (device == mp_const_none) { |
| 56 | + // umount |
| 57 | + FRESULT res = FR_NO_FILESYSTEM; |
| 58 | + if (fs_user_mount != NULL) { |
| 59 | + res = f_mount(NULL, fs_user_mount->str, 0); |
| 60 | + m_del_obj(fs_user_mount_t, fs_user_mount); |
| 61 | + fs_user_mount = NULL; |
| 62 | + } |
| 63 | + if (res != FR_OK) { |
| 64 | + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't umount")); |
| 65 | + } |
| 66 | + } else { |
| 67 | + // mount |
| 68 | + if (fs_user_mount != NULL) { |
| 69 | + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "device already mounted")); |
| 70 | + } |
| 71 | + |
| 72 | + // create new object |
| 73 | + fs_user_mount = m_new_obj(fs_user_mount_t); |
| 74 | + fs_user_mount->str = mnt_str; |
| 75 | + fs_user_mount->len = mnt_len; |
| 76 | + |
| 77 | + // load block protocol methods |
| 78 | + mp_load_method(device, MP_QSTR_readblocks, fs_user_mount->readblocks); |
| 79 | + mp_load_method_maybe(device, MP_QSTR_writeblocks, fs_user_mount->writeblocks); |
| 80 | + mp_load_method_maybe(device, MP_QSTR_sync, fs_user_mount->sync); |
| 81 | + mp_load_method(device, MP_QSTR_count, fs_user_mount->count); |
| 82 | + |
| 83 | + // Read-only device indicated by writeblocks[0] == MP_OBJ_NULL. |
| 84 | + // User can specify read-only device by: |
| 85 | + // 1. readonly=True keyword argument |
| 86 | + // 2. nonexistent writeblocks method (then writeblocks[0] == MP_OBJ_NULL already) |
| 87 | + if (args[0].u_bool) { |
| 88 | + fs_user_mount->writeblocks[0] = MP_OBJ_NULL; |
| 89 | + } |
| 90 | + |
| 91 | + // mount the block device |
| 92 | + FRESULT res = f_mount(&fs_user_mount->fatfs, fs_user_mount->str, 1); |
| 93 | + |
| 94 | + // check the result |
| 95 | + if (res == FR_OK) { |
| 96 | + } else if (res == FR_NO_FILESYSTEM && args[1].u_bool) { |
| 97 | + res = f_mkfs(fs_user_mount->str, 1, 0); |
| 98 | + if (res != FR_OK) { |
| 99 | + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mkfs")); |
| 100 | + } |
| 101 | + } else { |
| 102 | + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mount")); |
| 103 | + } |
| 104 | + |
| 105 | + /* |
| 106 | + if (fs_user_mount->writeblocks[0] == MP_OBJ_NULL) { |
| 107 | + printf("mounted read-only"); |
| 108 | + } else { |
| 109 | + printf("mounted read-write"); |
| 110 | + } |
| 111 | + DWORD nclst; |
| 112 | + FATFS *fatfs; |
| 113 | + f_getfree(fs_user_mount.str, &nclst, &fatfs); |
| 114 | + printf(" on %s with %u bytes free\n", fs_user_mount.str, (uint)(nclst * fatfs->csize * 512)); |
| 115 | + */ |
| 116 | + } |
| 117 | + return mp_const_none; |
| 118 | +} |
| 119 | +MP_DEFINE_CONST_FUN_OBJ_KW(pyb_mount_obj, 2, pyb_mount); |
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