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Diffstat (limited to 'extmod/fsusermount.c')
| -rw-r--r-- | extmod/fsusermount.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/extmod/fsusermount.c b/extmod/fsusermount.c new file mode 100644 index 000000000..2fc24be1b --- /dev/null +++ b/extmod/fsusermount.c @@ -0,0 +1,112 @@ +/* + * This file is part of the Micro Python project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2014 Damien P. George + * + * 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 "py/nlr.h" +#include "py/runtime.h" +#include "lib/fatfs/ff.h" +#include "fsusermount.h" + +STATIC mp_obj_t pyb_mount(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { + static const mp_arg_t allowed_args[] = { + { MP_QSTR_readonly, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} }, + { MP_QSTR_mkfs, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} }, + }; + + // parse args + mp_obj_t device = pos_args[0]; + mp_obj_t mount_point = pos_args[1]; + 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 + mp_uint_t mnt_len; + const char *mnt_str = mp_obj_str_get_data(mount_point, &mnt_len); + + if (device == mp_const_none) { + // umount + FRESULT res = FR_NO_FILESYSTEM; + if (MP_STATE_PORT(fs_user_mount) != NULL) { + res = f_mount(NULL, MP_STATE_PORT(fs_user_mount)->str, 0); + m_del_obj(fs_user_mount_t, MP_STATE_PORT(fs_user_mount)); + MP_STATE_PORT(fs_user_mount) = NULL; + } + if (res != FR_OK) { + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't umount")); + } + } else { + // mount + if (MP_STATE_PORT(fs_user_mount) != NULL) { + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "device already mounted")); + } + + // create new object + MP_STATE_PORT(fs_user_mount) = m_new_obj(fs_user_mount_t); + MP_STATE_PORT(fs_user_mount)->str = mnt_str; + MP_STATE_PORT(fs_user_mount)->len = mnt_len; + + // load block protocol methods + mp_load_method(device, MP_QSTR_readblocks, MP_STATE_PORT(fs_user_mount)->readblocks); + mp_load_method_maybe(device, MP_QSTR_writeblocks, MP_STATE_PORT(fs_user_mount)->writeblocks); + mp_load_method_maybe(device, MP_QSTR_sync, MP_STATE_PORT(fs_user_mount)->sync); + mp_load_method(device, MP_QSTR_count, MP_STATE_PORT(fs_user_mount)->count); + + // Read-only device indicated by writeblocks[0] == MP_OBJ_NULL. + // User can specify read-only device by: + // 1. readonly=True keyword argument + // 2. nonexistent writeblocks method (then writeblocks[0] == MP_OBJ_NULL already) + if (args[0].u_bool) { + MP_STATE_PORT(fs_user_mount)->writeblocks[0] = MP_OBJ_NULL; + } + + // mount the block device + FRESULT res = f_mount(&MP_STATE_PORT(fs_user_mount)->fatfs, MP_STATE_PORT(fs_user_mount)->str, 1); + + // check the result + if (res == FR_OK) { + } else if (res == FR_NO_FILESYSTEM && args[1].u_bool) { + res = f_mkfs(MP_STATE_PORT(fs_user_mount)->str, 1, 0); + if (res != FR_OK) { + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mkfs")); + } + } else { + nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't mount")); + } + + /* + if (MP_STATE_PORT(fs_user_mount)->writeblocks[0] == MP_OBJ_NULL) { + printf("mounted read-only"); + } else { + printf("mounted read-write"); + } + DWORD nclst; + FATFS *fatfs; + f_getfree(MP_STATE_PORT(fs_user_mount)->str, &nclst, &fatfs); + printf(" on %s with %u bytes free\n", MP_STATE_PORT(fs_user_mount)->str, (uint)(nclst * fatfs->csize * 512)); + */ + } + return mp_const_none; +} +MP_DEFINE_CONST_FUN_OBJ_KW(pyb_mount_obj, 2, pyb_mount); |