jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <Kernel/Debug.h>
8#include <Kernel/Devices/DeviceManagement.h>
9#include <Kernel/FileSystem/OpenFileDescription.h>
10#include <Kernel/Storage/DiskPartition.h>
11
12namespace Kernel {
13
14NonnullLockRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, MinorNumber minor_number, Partition::DiskPartitionMetadata metadata)
15{
16 auto partition_or_error = DeviceManagement::try_create_device<DiskPartition>(device, minor_number, metadata);
17 // FIXME: Find a way to propagate errors
18 VERIFY(!partition_or_error.is_error());
19 return partition_or_error.release_value();
20}
21
22DiskPartition::DiskPartition(BlockDevice& device, MinorNumber minor_number, Partition::DiskPartitionMetadata metadata)
23 : BlockDevice(100, minor_number, device.block_size())
24 , m_device(device)
25 , m_metadata(metadata)
26{
27}
28
29DiskPartition::~DiskPartition() = default;
30
31Partition::DiskPartitionMetadata const& DiskPartition::metadata() const
32{
33 return m_metadata;
34}
35
36void DiskPartition::start_request(AsyncBlockDeviceRequest& request)
37{
38 auto device = m_device.strong_ref();
39 if (!device)
40 request.complete(AsyncBlockDeviceRequest::RequestResult::Failure);
41 auto sub_request_or_error = device->try_make_request<AsyncBlockDeviceRequest>(request.request_type(),
42 request.block_index() + m_metadata.start_block(), request.block_count(), request.buffer(), request.buffer_size());
43 if (sub_request_or_error.is_error())
44 TODO();
45 request.add_sub_request(sub_request_or_error.release_value());
46}
47
48ErrorOr<size_t> DiskPartition::read(OpenFileDescription& fd, u64 offset, UserOrKernelBuffer& outbuf, size_t len)
49{
50 u64 adjust = m_metadata.start_block() * block_size();
51 dbgln_if(OFFD_DEBUG, "DiskPartition::read offset={}, adjust={}, len={}", fd.offset(), adjust, len);
52 return m_device.strong_ref()->read(fd, offset + adjust, outbuf, len);
53}
54
55bool DiskPartition::can_read(OpenFileDescription const& fd, u64 offset) const
56{
57 u64 adjust = m_metadata.start_block() * block_size();
58 dbgln_if(OFFD_DEBUG, "DiskPartition::can_read offset={}, adjust={}", offset, adjust);
59 return m_device.strong_ref()->can_read(fd, offset + adjust);
60}
61
62ErrorOr<size_t> DiskPartition::write(OpenFileDescription& fd, u64 offset, UserOrKernelBuffer const& inbuf, size_t len)
63{
64 u64 adjust = m_metadata.start_block() * block_size();
65 dbgln_if(OFFD_DEBUG, "DiskPartition::write offset={}, adjust={}, len={}", offset, adjust, len);
66 return m_device.strong_ref()->write(fd, offset + adjust, inbuf, len);
67}
68
69bool DiskPartition::can_write(OpenFileDescription const& fd, u64 offset) const
70{
71 u64 adjust = m_metadata.start_block() * block_size();
72 dbgln_if(OFFD_DEBUG, "DiskPartition::can_write offset={}, adjust={}", offset, adjust);
73 return m_device.strong_ref()->can_write(fd, offset + adjust);
74}
75
76StringView DiskPartition::class_name() const
77{
78 return "DiskPartition"sv;
79}
80
81}