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/*
* disk.cc - Implementation of the Disk class
* diskman, the Disk Manipulation library for
* Project Horizon
*
* Copyright (c) 2020 Adélie Linux and contributors. All rights reserved.
* This code is licensed under the AGPL 3.0 license, as noted in the
* LICENSE-code file in the root directory of this repository.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
#include "disk.hh"
#include <cstring>
#include <iostream>
#include <libfdisk/libfdisk.h>
#include <libudev.h>
#include <stdexcept>
namespace Horizon {
namespace DiskMan {
#define SAFE_SET(ivar, udev_call) \
value = udev_call;\
if(value != nullptr) {\
ivar = std::string(value);\
}
Disk::Disk(void *creation, int type, bool partition) {
switch(type) {
case 0: { /* udev */
struct udev_device *device = static_cast<struct udev_device *>(creation);
const char *value;
SAFE_SET(_name, udev_device_get_sysname(device));
SAFE_SET(_model, udev_device_get_property_value(device, "ID_MODEL"));
SAFE_SET(_full_serial, udev_device_get_property_value(device, "ID_SERIAL"));
SAFE_SET(_node, udev_device_get_devnode(device));
SAFE_SET(_devpath, udev_device_get_devpath(device));
value = udev_device_get_property_value(device, "ID_PART_TABLE_TYPE");
if(value == nullptr) {
_has_label = false;
_label = Unknown;
} else {
_has_label = true;
if(::strcmp(value, "apm") == 0) {
_label = APM;
} else if(::strcmp(value, "dos") == 0) {
_label = MBR;
} else if(::strcmp(value, "gpt") == 0) {
_label = GPT;
} else {
_label = Unknown;
}
}
value = udev_device_get_property_value(device, "ID_FS_TYPE");
if(value == nullptr) {
_has_fs = false;
} else {
_has_fs = true;
_fs_type = std::string(value);
SAFE_SET(_fs_label, udev_device_get_property_value(device, "ID_FS_LABEL"));
}
break;
}
default:
throw new std::invalid_argument{ "invalid type code" };
}
total_mb = free_mb = contiguous_mb = 0;
struct fdisk_context *ctxt = fdisk_new_context();
if(ctxt != nullptr) {
/* Open the device in read-only mode. We don't need to write to it */
if(fdisk_assign_device(ctxt, _node.c_str(), 1) == 0) {
_sector = fdisk_get_sector_size(ctxt);
total_mb = (fdisk_get_nsectors(ctxt) * _sector) / 1048576;
struct fdisk_table *frees = nullptr;
if(fdisk_has_label(ctxt) != 1) {
/* Disk has no label, so consider it empty */
free_mb = contiguous_mb = total_mb;
} else if(fdisk_get_freespaces(ctxt, &frees) == 0) {
for(size_t next = 0; next < fdisk_table_get_nents(frees);
next++) {
/* Each entry in frees is a "free space partition". */
struct fdisk_partition *part =
fdisk_table_get_partition(frees, next);
fdisk_sector_t size;
if(!fdisk_partition_has_size(part)) continue;
size = (fdisk_partition_get_size(part) * _sector) / 1048576;
free_mb += size;
if(size > contiguous_mb) contiguous_mb = size;
}
fdisk_unref_table(frees);
}
/* We used to free ctxt here, but it's useful for partition probing */
} else {
fdisk_unref_context(ctxt);
ctxt = nullptr;
}
}
if(partition) {
if(reload_partitions()) {
/* We're good */
} else if(type == 0) {
/* fallback to udev, if available */
std::cerr << "Falling back to udev partition probing" << std::endl;
struct udev_device *device = static_cast<struct udev_device *>(creation);
struct udev *udev = udev_device_get_udev(device);
struct udev_enumerate *part_enum = udev_enumerate_new(udev);
if(part_enum != NULL) {
struct udev_list_entry *first;
udev_enumerate_add_match_subsystem(part_enum, "block");
udev_enumerate_add_match_property(part_enum, "DEVTYPE",
"partition");
udev_enumerate_add_match_parent(part_enum, device);
udev_enumerate_scan_devices(part_enum);
first = udev_enumerate_get_list_entry(part_enum);
if(first != NULL) {
struct udev_list_entry *item;
udev_list_entry_foreach(item, first) {
const char *path = udev_list_entry_get_name(item);
struct udev_device *part_device = udev_device_new_from_syspath(udev, path);
if(part_device != nullptr) {
_partitions.push_back(Partition(*this, part_device, 1));
udev_device_unref(part_device);
}
}
}
udev_enumerate_unref(part_enum);
}
} else {
std::cerr << "Cannot load partitions for " << _name << std::endl;
}
}
if(ctxt != nullptr) {
fdisk_unref_context(ctxt);
}
}
bool Disk::reload_partitions() {
bool success = false;
struct fdisk_context *ctxt = fdisk_new_context();
struct fdisk_table *parts = nullptr;
if(ctxt == nullptr) {
return false;
}
/* Open the device in read-only mode. We don't need to write to it */
if(fdisk_assign_device(ctxt, _node.c_str(), 1) != 0) {
goto destroy_context;
}
if(fdisk_get_partitions(ctxt, &parts) == 0) {
_partitions.clear();
for(size_t next = 0; next < fdisk_table_get_nents(parts);
next++) {
struct fdisk_partition *part =
fdisk_table_get_partition(parts, next);
_partitions.push_back(Partition(*this, part, 0));
}
success = true;
fdisk_unref_table(parts);
}
destroy_context:
fdisk_unref_context(ctxt);
return success;
}
const std::vector<Partition> Disk::partitions() const {
if(!this->has_label()) {
throw std::logic_error{ "attempt to retrieve partitions for non-labelled disk" };
}
return this->_partitions;
}
}
}
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