1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/BlockDevicesDirectory.h>
namespace Kernel {
AsyncBlockDeviceRequest::AsyncBlockDeviceRequest(Device& block_device, RequestType request_type, u64 block_index, u32 block_count, UserOrKernelBuffer const& buffer, size_t buffer_size)
: AsyncDeviceRequest(block_device)
, m_block_device(static_cast<BlockDevice&>(block_device))
, m_request_type(request_type)
, m_block_index(block_index)
, m_block_count(block_count)
, m_buffer(buffer)
, m_buffer_size(buffer_size)
{
}
void AsyncBlockDeviceRequest::start()
{
m_block_device.start_request(*this);
}
BlockDevice::~BlockDevice() = default;
void BlockDevice::after_inserting_add_symlink_to_device_identifier_directory()
{
VERIFY(m_symlink_sysfs_component);
SysFSBlockDevicesDirectory::the().devices_list({}).with([&](auto& list) -> void {
list.append(*m_symlink_sysfs_component);
});
}
void BlockDevice::before_will_be_destroyed_remove_symlink_from_device_identifier_directory()
{
VERIFY(m_symlink_sysfs_component);
SysFSBlockDevicesDirectory::the().devices_list({}).with([&](auto& list) -> void {
list.remove(*m_symlink_sysfs_component);
});
}
// FIXME: This method will be eventually removed after all nodes in /sys/dev/block/ are symlinks
void BlockDevice::after_inserting_add_to_device_identifier_directory()
{
VERIFY(m_sysfs_component);
SysFSBlockDevicesDirectory::the().devices_list({}).with([&](auto& list) -> void {
list.append(*m_sysfs_component);
});
}
// FIXME: This method will be eventually removed after all nodes in /sys/dev/block/ are symlinks
void BlockDevice::before_will_be_destroyed_remove_from_device_identifier_directory()
{
VERIFY(m_sysfs_component);
SysFSBlockDevicesDirectory::the().devices_list({}).with([&](auto& list) -> void {
list.remove(*m_sysfs_component);
});
}
bool BlockDevice::read_block(u64 index, UserOrKernelBuffer& buffer)
{
auto read_request_or_error = try_make_request<AsyncBlockDeviceRequest>(AsyncBlockDeviceRequest::Read, index, 1, buffer, m_block_size);
if (read_request_or_error.is_error()) {
dbgln("BlockDevice::read_block({}): try_make_request failed", index);
return false;
}
auto read_request = read_request_or_error.release_value();
switch (read_request->wait().request_result()) {
case AsyncDeviceRequest::Success:
return true;
case AsyncDeviceRequest::Failure:
dbgln("BlockDevice::read_block({}) IO error", index);
break;
case AsyncDeviceRequest::MemoryFault:
dbgln("BlockDevice::read_block({}) EFAULT", index);
break;
case AsyncDeviceRequest::Cancelled:
dbgln("BlockDevice::read_block({}) cancelled", index);
break;
default:
VERIFY_NOT_REACHED();
}
return false;
}
bool BlockDevice::write_block(u64 index, UserOrKernelBuffer const& buffer)
{
auto write_request_or_error = try_make_request<AsyncBlockDeviceRequest>(AsyncBlockDeviceRequest::Write, index, 1, buffer, m_block_size);
if (write_request_or_error.is_error()) {
dbgln("BlockDevice::write_block({}): try_make_request failed", index);
return false;
}
auto write_request = write_request_or_error.release_value();
switch (write_request->wait().request_result()) {
case AsyncDeviceRequest::Success:
return true;
case AsyncDeviceRequest::Failure:
dbgln("BlockDevice::write_block({}) IO error", index);
break;
case AsyncDeviceRequest::MemoryFault:
dbgln("BlockDevice::write_block({}) EFAULT", index);
break;
case AsyncDeviceRequest::Cancelled:
dbgln("BlockDevice::write_block({}) cancelled", index);
break;
default:
VERIFY_NOT_REACHED();
}
return false;
}
}
|
