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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
#include "kernel/filesystem/vfs.hpp"
#include "kapi/system.hpp"
#include "kernel/devices/device.hpp"
#include "kernel/devices/storage/storage_management.hpp"
#include "kernel/filesystem/custody.hpp"
#include "kernel/filesystem/device_inode.hpp"
#include "kernel/filesystem/ext2/ext2_filesystem.hpp"
#include "kernel/filesystem/filesystem.hpp"
#include "kernel/filesystem/mount.hpp"
#include "kernel/filesystem/open_file_description.hpp"
#include <kstd/memory>
#include <algorithm>
#include <optional>
#include <string_view>
namespace filesystem
{
namespace
{
constinit auto static active_vfs = std::optional<vfs>{};
} // namespace
auto vfs::init() -> void
{
if (active_vfs)
{
kapi::system::panic("[FILESYSTEM] vfs has already been initialized.");
}
active_vfs.emplace(vfs{});
auto storage_mgmt = devices::storage::storage_management::get();
// TODO BA-FS26 fix mounting boot_device
if (auto boot_device = storage_mgmt.determine_boot_device())
{
active_vfs->m_root_fs = kstd::make_shared<ext2::ext2_filesystem>();
if (active_vfs->do_mount("/", active_vfs->m_root_fs) != 0)
{
kapi::system::panic("[FILESYSTEM] Failed to mount root filesystem.");
}
// TODO BA-FS26 use do_mount when tempdevfs is implemented -> just call /dev/ with all devices in devtempfs
std::ranges::for_each(storage_mgmt.all_controllers(), [&](auto controller) {
std::ranges::for_each(controller->all_devices(), [&](auto device) { active_vfs->make_device_node(device); });
});
}
else
{
// TODO BA-FS26 ?? what when no boot_device == no modules loaded??
}
}
auto vfs::get() -> vfs &
{
if (!active_vfs)
{
kapi::system::panic("[FILESYSTEM] vfs has not been initialized.");
}
return *active_vfs;
}
auto vfs::open(std::string_view path) -> kstd::shared_ptr<open_file_description>
{
if (auto custody = resolve_path(path))
{
return kstd::make_shared<open_file_description>(custody->get_inode());
}
return nullptr;
}
auto vfs::do_mount(std::string_view path, kstd::shared_ptr<filesystem> const & filesystem) -> int
{
if (!filesystem)
{
return -1; // TODO BA-FS26 panic or errorcode?
}
if (path.empty() || path.front() != '/')
{
return -1; // TODO BA-FS26 panic or errorcode?
}
// TODO BA-FS26 better path validation
if ((path.size() > 1 && path.back() == '/'))
{
return -1; // TODO BA-FS26 panic or errorcode?
}
if (path == "/")
{
m_root_fs = filesystem;
m_root_mount = mount{"/", filesystem};
return 0;
}
auto existing_mount =
std::ranges::find_if(m_mounts, [&](auto const & existing) { return existing.path() == path; });
if (existing_mount != m_mounts.end())
{
*existing_mount = mount{path, filesystem};
}
else
{
m_mounts.push_back(mount{path, filesystem});
}
return 0;
}
auto vfs::make_device_node(kstd::shared_ptr<devices::device> const & device) -> void
{
if (!device)
{
kapi::system::panic("[FILESYSTEM] make_device_node called with null device.");
}
m_device_nodes.push_back(device_node_entry{device->name(), kstd::make_shared<device_inode>(device)});
}
auto vfs::resolve_path(std::string_view path) -> std::optional<custody>
{
// TODO BA-FS26 implement real path resolution with mounts and directories etc.
// For now, just support device nodes at /dev/<device_name>.
// TODO BA-FS26 better path validation
// TODO BA-FS26 implement a path parser (maybe in libs?) and use it here and in do_mount
constexpr auto device_prefix = std::string_view{"/dev/"};
if (path.starts_with(device_prefix))
{
auto const device_name = path.substr(device_prefix.size());
auto entry = std::ranges::find_if(m_device_nodes, [&](auto const & device_entry) {
return device_entry.has_value() && device_entry->name == device_name;
});
if (entry != m_device_nodes.end())
{
return custody{nullptr, entry->value().node};
}
return std::nullopt;
}
return std::nullopt;
}
} // namespace filesystem
|
