RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 08:38:12 +00:00
Code Issues Activity Actions

Kernel: Move Partition code files to the Storage folder

Browse source 
This folder is more appropriate for these files.
This commit is contained in:
Liav A 2020-12-25 20:23:35 +02:00 • committed by Andreas Kling
parent 247517cd4a
commit 3a19e18d1e
10 changed files with 17 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

208
Kernel/Storage/Partition/EBRPartitionTable.cpp Normal file
View file

@ -0,0 +1,208 @@
/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/ByteBuffer.h>
#include <Kernel/Storage/Partition/EBRPartitionTable.h>
#ifndef EBR_DEBUG
# define EBR_DEBUG
#endif
namespace Kernel {
EBRPartitionTable::EBRPartitionTable(NonnullRefPtr<BlockDevice> device)
: m_device(move(device))
{
}
EBRPartitionTable::~EBRPartitionTable()
{
}
const MBRPartitionHeader& EBRPartitionTable::header() const
{
return *reinterpret_cast<const MBRPartitionHeader*>(m_cached_mbr_header);
}
const EBRPartitionExtension& EBRPartitionTable::ebr_extension() const
{
return *reinterpret_cast<const EBRPartitionExtension*>(m_cached_ebr_header);
}
int EBRPartitionTable::index_of_ebr_container() const
{
for (int i = 0; i < 4; i++) {
if (header().entry[i].type == EBR_CHS_CONTAINER || header().entry[i].type == EBR_LBA_CONTAINER)
return i;
}
ASSERT_NOT_REACHED();
}
bool EBRPartitionTable::initialize()
{
auto mbr_header_request = m_device->make_request<AsyncBlockDeviceRequest>(AsyncBlockDeviceRequest::Read,
0, 1, UserOrKernelBuffer::for_kernel_buffer(m_cached_mbr_header), sizeof(m_cached_mbr_header));
auto mbr_header_buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_mbr_header);
if (!m_device->read_block(0, mbr_header_buffer)) {
return false;
}
auto& header = this->header();
m_ebr_container_id = index_of_ebr_container() + 1;
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::initialize: MBR_signature=0x" << String::format("%x", header.mbr_signature);
#endif
if (header.mbr_signature != MBR_SIGNATURE) {
klog() << "EBRPartitionTable::initialize: bad MBR signature 0x" << String::format("%x", header.mbr_signature);
return false;
}
auto& ebr_entry = header.entry[m_ebr_container_id - 1];
auto ebr_header_buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_ebr_header);
if (!m_device->read_block(ebr_entry.offset, ebr_header_buffer)) {
return false;
}
size_t index = 1;
while (index < 128) { // Unlikely to encounter a disk with 128 partitions in this configuration...
if (ebr_extension().next_chained_ebr_extension.offset == 0 && ebr_extension().next_chained_ebr_extension.type == 0) {
break;
}
index++;
if (!m_device->read_block(ebr_extension().next_chained_ebr_extension.offset, ebr_header_buffer)) {
return false;
}
}
m_ebr_chained_extensions_count = index;
klog() << "EBRPartitionTable::initialize: Extended partitions count - " << m_ebr_chained_extensions_count;
return true;
}
RefPtr<DiskPartition> EBRPartitionTable::get_non_extended_partition(unsigned index)
{
auto& header = this->header();
auto& entry = header.entry[index - 1];
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: status=0x" << String::format("%x", entry.status) << " offset=0x" << String::format("%x", entry.offset);
#endif
if (entry.offset == 0x00) {
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: missing partition requested index=" << index;
#endif
return nullptr;
}
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: found partition index=" << index << " type=" << String::format("%x", entry.type);
#endif
return DiskPartition::create(m_device, entry.offset, (entry.offset + entry.length));
}
RefPtr<DiskPartition> EBRPartitionTable::get_extended_partition(unsigned index)
{
unsigned relative_index = index - m_ebr_container_id;
auto& header = this->header();
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: relative index " << relative_index;
#endif
auto& ebr_entry = header.entry[m_ebr_container_id - 1];
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: Extended partition, offset 0x" << String::format("%x", ebr_entry.offset) << ", type " << String::format("%x", ebr_entry.type);
#endif
auto ebr_header_buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_ebr_header);
if (!m_device->read_block(ebr_entry.offset, ebr_header_buffer)) {
return nullptr;
}
size_t i = 0;
while (i < relative_index) {
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: logical partition, relative offset 0x" << String::format("%x", ebr_extension().entry.offset) << ", type " << String::format("%x", ebr_extension().entry.type);
klog() << "EBRPartitionTable::partition: next logical partition, relative offset 0x" << String::format("%x", ebr_extension().next_chained_ebr_extension.offset) << ", type " << String::format("%x", ebr_extension().next_chained_ebr_extension.type);
#endif
if (ebr_extension().next_chained_ebr_extension.offset == 0 && ebr_extension().next_chained_ebr_extension.type == 0) {
break;
}
i++;
if (!m_device->read_block(ebr_extension().next_chained_ebr_extension.offset, ebr_header_buffer)) {
return nullptr;
}
}
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: status=" << String::format("%x", ebr_extension().entry.status) << " offset=" << String::format("%x", ebr_extension().entry.offset + ebr_entry.offset);
#endif
if (ebr_extension().entry.offset == 0x00) {
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: missing partition requested index=" << index;
#endif
return nullptr;
}
#ifdef EBR_DEBUG
klog() << "EBRPartitionTable::partition: found partition index=" << index << " type=" << String::format("%x", ebr_extension().entry.type);
#endif
return DiskPartition::create(m_device, ebr_extension().entry.offset + ebr_entry.offset, (ebr_extension().entry.offset + ebr_entry.offset + ebr_extension().entry.length));
}
bool EBRPartitionTable::index_is_extended_partition(unsigned index) const
{
return !(m_ebr_container_id > index || index > (m_ebr_container_id + m_ebr_chained_extensions_count));
}
RefPtr<DiskPartition> EBRPartitionTable::partition(unsigned index)
{
ASSERT(index >= 1 && index <= m_ebr_chained_extensions_count + 4);
auto& header = this->header();
if (header.mbr_signature != MBR_SIGNATURE) {
klog() << "EBRPartitionTable::initialize: bad MBR signature - not initialized? 0x" << String::format("%x", header.mbr_signature);
return nullptr;
}
if (index_is_extended_partition(index))
return get_extended_partition(index);
if (index > 4)
return get_non_extended_partition(index - m_ebr_chained_extensions_count);
return get_non_extended_partition(index);
}
}