mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-11 01:22:12 +02:00
6a4ceb6bf2
Previously, you'd occasionally see this sort of construct (simplified):
```
return FooDevice::all_instances().with([&](auto& list) {
for (auto& device : list) {
if (/* search condition */)
continue;
return do_something_that_reacquires(device.index());
}
return ENOENT;
});
```
This would only work if the relevant `all_instances()` used a recursive
spinlock, since reacquiring the device would lock that again.
To get around this, a new helper has been added in `Device` through
which devices can be accessed whilst locking the device list, removing
the need to loop through the device type's `all_instances()`.
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
|
|
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/API/DeviceFileTypes.h>
|
|
#include <Kernel/API/MajorNumberAllocation.h>
|
|
#include <Kernel/Devices/Device.h>
|
|
#include <Kernel/Devices/TTY/SlavePTY.h>
|
|
#include <Kernel/FileSystem/DevPtsFS/FileSystem.h>
|
|
#include <Kernel/FileSystem/DevPtsFS/Inode.h>
|
|
#include <Kernel/Time/TimeManagement.h>
|
|
|
|
namespace Kernel {
|
|
|
|
ErrorOr<NonnullRefPtr<FileSystem>> DevPtsFS::try_create(FileSystemSpecificOptions const&)
|
|
{
|
|
return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFS));
|
|
}
|
|
|
|
DevPtsFS::DevPtsFS() = default;
|
|
DevPtsFS::~DevPtsFS() = default;
|
|
|
|
ErrorOr<void> DevPtsFS::initialize()
|
|
{
|
|
m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(*this)));
|
|
m_root_inode->m_metadata.inode = { fsid(), 1 };
|
|
m_root_inode->m_metadata.mode = 0040555;
|
|
m_root_inode->m_metadata.uid = 0;
|
|
m_root_inode->m_metadata.gid = 0;
|
|
m_root_inode->m_metadata.size = 0;
|
|
m_root_inode->m_metadata.mtime = TimeManagement::boot_time();
|
|
return {};
|
|
}
|
|
|
|
static unsigned inode_index_to_pty_index(InodeIndex inode_index)
|
|
{
|
|
VERIFY(inode_index > 1);
|
|
return inode_index.value() - 2;
|
|
}
|
|
|
|
Inode& DevPtsFS::root_inode()
|
|
{
|
|
return *m_root_inode;
|
|
}
|
|
|
|
ErrorOr<void> DevPtsFS::rename(Inode&, StringView, Inode&, StringView)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
u8 DevPtsFS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
|
|
{
|
|
return ram_backed_file_type_to_directory_entry_type(entry);
|
|
}
|
|
|
|
ErrorOr<NonnullRefPtr<Inode>> DevPtsFS::get_inode(InodeIdentifier inode_id) const
|
|
{
|
|
if (inode_id.index() == 1)
|
|
return *m_root_inode;
|
|
|
|
unsigned pty_index = inode_index_to_pty_index(inode_id.index());
|
|
|
|
UserID pty_uid;
|
|
GroupID pty_gid;
|
|
LockRefPtr<SlavePTY> device;
|
|
|
|
Device::run_by_type_and_major_minor_numbers(DeviceNodeType::Character, to_underlying(MajorAllocation::CharacterDeviceFamily::SlavePTY), pty_index, [&](RefPtr<Device> found_device) {
|
|
if (!found_device)
|
|
return;
|
|
auto& pty = static_cast<SlavePTY&>(*found_device);
|
|
pty_uid = pty.uid();
|
|
pty_gid = pty.gid();
|
|
device = pty;
|
|
});
|
|
|
|
if (!device)
|
|
return ENOENT;
|
|
|
|
auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), device)));
|
|
inode->m_metadata.inode = inode_id;
|
|
inode->m_metadata.size = 0;
|
|
inode->m_metadata.uid = pty_uid;
|
|
inode->m_metadata.gid = pty_gid;
|
|
inode->m_metadata.mode = 0020600;
|
|
inode->m_metadata.major_device = to_underlying(MajorAllocation::CharacterDeviceFamily::SlavePTY);
|
|
inode->m_metadata.minor_device = pty_index;
|
|
inode->m_metadata.mtime = TimeManagement::boot_time();
|
|
return inode;
|
|
}
|
|
|
|
}
|