ceae637416
This patch enhances part_block with support for parsing the AHDI partition scheme, and the detection of the GEMDOS variant of FAT as used by Atari TOS. As a side effect of the implementation, the patch improves the MBR parsing code by avoiding pointers and using const qualifiers. Fixes #3470
142 lines
3.3 KiB
C++
142 lines
3.3 KiB
C++
/*
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* \brief Front end of the partition server
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* \author Sebastian Sumpf
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* \author Stefan Kalkowski
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* \author Josef Soentgen
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* \date 2011-05-30
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#include <base/attached_rom_dataspace.h>
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#include <block_session/rpc_object.h>
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#include "component.h"
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#include "driver.h"
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#include "gpt.h"
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#include "mbr.h"
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void Block::Driver::_ready_to_submit() {
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Block::Session_component::wake_up(); }
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class Main
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{
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private:
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Block::Partition_table & _table();
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Genode::Env &_env;
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Genode::Attached_rom_dataspace _config { _env, "config" };
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Genode::Heap _heap { _env.ram(), _env.rm() };
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Block::Driver _driver { _env, _heap };
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Genode::Reporter _reporter { _env, "partitions" };
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Mbr_partition_table _mbr { _heap, _driver, _reporter };
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Gpt _gpt { _heap, _driver, _reporter };
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Block::Root _root { _env, _config.xml(), _heap, _driver, _table() };
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public:
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struct No_partion_table : Genode::Exception { };
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struct Ambiguous_tables : Genode::Exception { };
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struct Invalid_config : Genode::Exception { };
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Main(Genode::Env &env) : _env(env)
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{
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/*
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* we read all partition information,
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* now it's safe to turn in asynchronous mode
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*/
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_driver.work_asynchronously();
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/* announce at parent */
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env.parent().announce(env.ep().manage(_root));
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}
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};
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Block::Partition_table & Main::_table()
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{
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using namespace Genode;
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Xml_node const config = _config.xml();
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bool const ignore_gpt = config.attribute_value("ignore_gpt", false);
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bool const ignore_mbr = config.attribute_value("ignore_mbr", false);
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bool valid_mbr = false;
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bool valid_gpt = false;
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bool pmbr_found = false;
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bool report = false;
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if (ignore_gpt && ignore_mbr) {
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error("invalid configuration: cannot ignore GPT as well as MBR");
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throw Invalid_config();
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}
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try {
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report = _config.xml().sub_node("report").attribute_value
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("partitions", false);
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if (report)
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_reporter.enabled(true);
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} catch(...) {}
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/*
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* Try to parse MBR as well as GPT first if not instructued
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* to ignore either one of them.
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*/
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if (!ignore_mbr) {
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try { valid_mbr = _mbr.parse(); }
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catch (Mbr_partition_table::Protective_mbr_found) {
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pmbr_found = true;
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}
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}
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if (!ignore_gpt) {
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try { valid_gpt = _gpt.parse(); }
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catch (...) { }
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}
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/*
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* Both tables are valid (although we would have expected a PMBR in
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* conjunction with a GPT header - hybrid operation is not supported)
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* and we will not decide which one to use, it is up to the user.
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*/
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if (valid_mbr && valid_gpt) {
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error("ambigious tables: found valid MBR as well as valid GPT");
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throw Ambiguous_tables();
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}
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if (valid_gpt && !pmbr_found) {
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warning("will use GPT without proper protective MBR");
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}
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/* PMBR missing, i.e, MBR part[0] contains whole disk and GPT valid */
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if (pmbr_found && ignore_gpt) {
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warning("found protective MBR but GPT is to be ignored");
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}
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/*
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* Return the appropriate table or abort if none is found.
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*/
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if (valid_gpt) return _gpt;
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if (valid_mbr) return _mbr;
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error("Aborting: no partition table found.");
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throw No_partion_table();
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}
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void Component::construct(Genode::Env &env) { static Main main(env); }
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