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- /*
- * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/StringView.h>
- #include <Kernel/FileSystem/DevFS.h>
- #include <Kernel/FileSystem/VirtualFileSystem.h>
- namespace Kernel {
- KResultOr<NonnullRefPtr<DevFS>> DevFS::try_create()
- {
- return adopt_nonnull_ref_or_enomem(new (nothrow) DevFS);
- }
- DevFS::DevFS()
- {
- }
- size_t DevFS::allocate_inode_index()
- {
- MutexLocker locker(m_lock);
- m_next_inode_index = m_next_inode_index.value() + 1;
- VERIFY(m_next_inode_index > 0);
- return 1 + m_next_inode_index.value();
- }
- DevFS::~DevFS()
- {
- }
- KResult DevFS::initialize()
- {
- m_root_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevFSRootDirectoryInode(*this)));
- return KSuccess;
- }
- Inode& DevFS::root_inode()
- {
- return *m_root_inode;
- }
- DevFSInode::DevFSInode(DevFS& fs)
- : Inode(fs, fs.allocate_inode_index())
- {
- }
- KResultOr<size_t> DevFSInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
- {
- VERIFY_NOT_REACHED();
- }
- KResult DevFSInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const
- {
- VERIFY_NOT_REACHED();
- }
- KResultOr<NonnullRefPtr<Inode>> DevFSInode::lookup(StringView)
- {
- VERIFY_NOT_REACHED();
- }
- void DevFSInode::flush_metadata()
- {
- }
- KResultOr<size_t> DevFSInode::write_bytes(off_t, size_t, const UserOrKernelBuffer&, OpenFileDescription*)
- {
- VERIFY_NOT_REACHED();
- }
- KResultOr<NonnullRefPtr<Inode>> DevFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
- {
- return EROFS;
- }
- KResult DevFSInode::add_child(Inode&, const StringView&, mode_t)
- {
- return EROFS;
- }
- KResult DevFSInode::remove_child(const StringView&)
- {
- return EROFS;
- }
- KResult DevFSInode::chmod(mode_t)
- {
- return EPERM;
- }
- KResult DevFSInode::chown(UserID, GroupID)
- {
- return EPERM;
- }
- KResult DevFSInode::truncate(u64)
- {
- return EPERM;
- }
- StringView DevFSLinkInode::name() const
- {
- return m_name->view();
- }
- DevFSLinkInode::~DevFSLinkInode()
- {
- }
- DevFSLinkInode::DevFSLinkInode(DevFS& fs, NonnullOwnPtr<KString> name)
- : DevFSInode(fs)
- , m_name(move(name))
- {
- }
- KResultOr<size_t> DevFSLinkInode::read_bytes(off_t offset, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const
- {
- MutexLocker locker(m_inode_lock);
- VERIFY(offset == 0);
- VERIFY(m_link);
- TRY(buffer.write(m_link->characters() + offset, m_link->length()));
- return m_link->length();
- }
- InodeMetadata DevFSLinkInode::metadata() const
- {
- InodeMetadata metadata;
- metadata.inode = { fsid(), index() };
- metadata.mode = S_IFLNK | 0555;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = mepoch;
- return metadata;
- }
- KResultOr<size_t> DevFSLinkInode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription*)
- {
- auto new_string = TRY(buffer.try_copy_into_kstring(count));
- MutexLocker locker(m_inode_lock);
- VERIFY(offset == 0);
- VERIFY(buffer.is_kernel_buffer());
- m_link = move(new_string);
- return count;
- }
- DevFSDirectoryInode::DevFSDirectoryInode(DevFS& fs)
- : DevFSInode(fs)
- {
- }
- DevFSDirectoryInode::~DevFSDirectoryInode()
- {
- }
- InodeMetadata DevFSDirectoryInode::metadata() const
- {
- InodeMetadata metadata;
- metadata.inode = { fsid(), 1 };
- metadata.mode = 0040555;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = mepoch;
- return metadata;
- }
- DevFSRootDirectoryInode::DevFSRootDirectoryInode(DevFS& fs)
- : DevFSDirectoryInode(fs)
- {
- }
- KResult DevFSRootDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
- {
- MutexLocker locker(fs().m_lock);
- callback({ ".", identifier(), 0 });
- callback({ "..", identifier(), 0 });
- for (auto& node : m_nodes) {
- InodeIdentifier identifier = { fsid(), node.index() };
- callback({ node.name(), identifier, 0 });
- }
- return KSuccess;
- }
- KResultOr<NonnullRefPtr<Inode>> DevFSRootDirectoryInode::lookup(StringView name)
- {
- MutexLocker locker(fs().m_lock);
- for (auto& node : m_nodes) {
- if (node.name() == name)
- return node;
- }
- return ENOENT;
- }
- KResult DevFSRootDirectoryInode::remove_child(const StringView& name)
- {
- MutexLocker locker(fs().m_lock);
- for (auto& node : m_nodes) {
- if (node.name() == name) {
- m_nodes.remove(node);
- return KSuccess;
- }
- }
- return KResult(ENOENT);
- }
- KResultOr<NonnullRefPtr<Inode>> DevFSRootDirectoryInode::create_child(StringView name, mode_t mode, dev_t device_mode, UserID, GroupID)
- {
- MutexLocker locker(fs().m_lock);
- for (auto& node : m_nodes) {
- if (node.name() == name)
- return KResult(EEXIST);
- }
- InodeMetadata metadata;
- metadata.mode = mode;
- if (metadata.is_directory()) {
- if (name != "pts")
- return EROFS;
- auto new_directory_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevFSPtsDirectoryInode(fs())));
- m_nodes.append(*new_directory_inode);
- return new_directory_inode;
- }
- if (metadata.is_device()) {
- auto name_kstring = TRY(KString::try_create(name));
- unsigned major = major_from_encoded_device(device_mode);
- unsigned minor = minor_from_encoded_device(device_mode);
- auto new_device_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevFSDeviceInode(fs(), major, minor, is_block_device(mode), move(name_kstring))));
- TRY(new_device_inode->chmod(mode));
- m_nodes.append(*new_device_inode);
- return new_device_inode;
- }
- if (metadata.is_symlink()) {
- auto name_kstring = TRY(KString::try_create(name));
- auto new_link_inode = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) DevFSLinkInode(fs(), move(name_kstring))));
- m_nodes.append(*new_link_inode);
- return new_link_inode;
- }
- return EROFS;
- }
- DevFSRootDirectoryInode::~DevFSRootDirectoryInode()
- {
- }
- InodeMetadata DevFSRootDirectoryInode::metadata() const
- {
- InodeMetadata metadata;
- metadata.inode = { fsid(), 1 };
- metadata.mode = 0040555;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = mepoch;
- return metadata;
- }
- DevFSDeviceInode::DevFSDeviceInode(DevFS& fs, unsigned major_number, unsigned minor_number, bool block_device, NonnullOwnPtr<KString> name)
- : DevFSInode(fs)
- , m_name(move(name))
- , m_major_number(major_number)
- , m_minor_number(minor_number)
- , m_block_device(block_device)
- {
- }
- DevFSDeviceInode::~DevFSDeviceInode()
- {
- }
- KResult DevFSDeviceInode::chown(UserID uid, GroupID gid)
- {
- MutexLocker locker(m_inode_lock);
- m_uid = uid;
- m_gid = gid;
- return KSuccess;
- }
- KResult DevFSDeviceInode::chmod(mode_t mode)
- {
- MutexLocker locker(m_inode_lock);
- mode &= 0777;
- if (m_required_mode == mode)
- return KSuccess;
- m_required_mode = mode;
- return KSuccess;
- }
- StringView DevFSDeviceInode::name() const
- {
- return m_name->view();
- }
- KResultOr<size_t> DevFSDeviceInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription* description) const
- {
- MutexLocker locker(m_inode_lock);
- VERIFY(!!description);
- RefPtr<Device> device = Device::get_device(m_major_number, m_minor_number);
- if (!device)
- return KResult(ENODEV);
- if (!device->can_read(*description, offset))
- return KResult(ENOTIMPL);
- auto result = const_cast<Device&>(*device).read(*description, offset, buffer, count);
- if (result.is_error())
- return result;
- return result.value();
- }
- InodeMetadata DevFSDeviceInode::metadata() const
- {
- MutexLocker locker(m_inode_lock);
- InodeMetadata metadata;
- metadata.inode = { fsid(), index() };
- metadata.mode = (m_block_device ? S_IFBLK : S_IFCHR) | m_required_mode;
- metadata.uid = m_uid;
- metadata.gid = m_gid;
- metadata.size = 0;
- metadata.mtime = mepoch;
- metadata.major_device = m_major_number;
- metadata.minor_device = m_minor_number;
- return metadata;
- }
- KResultOr<size_t> DevFSDeviceInode::write_bytes(off_t offset, size_t count, const UserOrKernelBuffer& buffer, OpenFileDescription* description)
- {
- MutexLocker locker(m_inode_lock);
- VERIFY(!!description);
- RefPtr<Device> device = Device::get_device(m_major_number, m_minor_number);
- if (!device)
- return KResult(ENODEV);
- if (!device->can_write(*description, offset))
- return KResult(ENOTIMPL);
- auto result = const_cast<Device&>(*device).write(*description, offset, buffer, count);
- if (result.is_error())
- return result;
- return result.value();
- }
- DevFSPtsDirectoryInode::DevFSPtsDirectoryInode(DevFS& fs)
- : DevFSDirectoryInode(fs)
- {
- }
- KResult DevFSPtsDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
- {
- MutexLocker locker(m_inode_lock);
- callback({ ".", identifier(), 0 });
- callback({ "..", identifier(), 0 });
- return KSuccess;
- }
- KResultOr<NonnullRefPtr<Inode>> DevFSPtsDirectoryInode::lookup(StringView)
- {
- return ENOENT;
- }
- DevFSPtsDirectoryInode::~DevFSPtsDirectoryInode()
- {
- }
- InodeMetadata DevFSPtsDirectoryInode::metadata() const
- {
- InodeMetadata metadata;
- metadata.inode = { fsid(), index() };
- metadata.mode = 0040555;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = mepoch;
- return metadata;
- }
- }
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