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11ead5c84f
Instead of returning a raw pointer, which could be technically invalid when using it in the caller function, we return a valid RefPtr of such device. This ensures that the code in DevPtsFS is now safe from a rare race condition in which the SlavePTY device is gone but we still have a pointer to it.
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/TTY/SlavePTY.h>
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#include <Kernel/FileSystem/DevPtsFS/FileSystem.h>
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#include <Kernel/FileSystem/DevPtsFS/Inode.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<FileSystem>> DevPtsFS::try_create(ReadonlyBytes)
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{
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return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFS));
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}
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DevPtsFS::DevPtsFS() = default;
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DevPtsFS::~DevPtsFS() = default;
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ErrorOr<void> DevPtsFS::initialize()
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{
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m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(*this)));
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m_root_inode->m_metadata.inode = { fsid(), 1 };
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m_root_inode->m_metadata.mode = 0040555;
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m_root_inode->m_metadata.uid = 0;
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m_root_inode->m_metadata.gid = 0;
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m_root_inode->m_metadata.size = 0;
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m_root_inode->m_metadata.mtime = TimeManagement::boot_time();
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return {};
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}
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static unsigned inode_index_to_pty_index(InodeIndex inode_index)
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{
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VERIFY(inode_index > 1);
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return inode_index.value() - 2;
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}
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Inode& DevPtsFS::root_inode()
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{
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return *m_root_inode;
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}
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u8 DevPtsFS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
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{
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return ram_backed_file_type_to_directory_entry_type(entry);
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}
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ErrorOr<NonnullRefPtr<Inode>> DevPtsFS::get_inode(InodeIdentifier inode_id) const
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{
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if (inode_id.index() == 1)
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return *m_root_inode;
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unsigned pty_index = inode_index_to_pty_index(inode_id.index());
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auto device = DeviceManagement::the().get_device(201, pty_index);
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VERIFY(device);
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auto& pts_device = static_cast<SlavePTY&>(*device);
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auto inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index(), pts_device)));
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inode->m_metadata.inode = inode_id;
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inode->m_metadata.size = 0;
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inode->m_metadata.uid = pts_device.uid();
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inode->m_metadata.gid = pts_device.gid();
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inode->m_metadata.mode = 0020600;
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inode->m_metadata.major_device = device->major();
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inode->m_metadata.minor_device = device->minor();
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inode->m_metadata.mtime = TimeManagement::boot_time();
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return inode;
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}
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}
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