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- /*
- * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/StringView.h>
- #include <Kernel/FileSystem/SysFS.h>
- #include <Kernel/FileSystem/SysFS/Registry.h>
- #include <Kernel/Sections.h>
- #include <Kernel/Time/TimeManagement.h>
- namespace Kernel {
- ErrorOr<NonnullLockRefPtr<FileSystem>> SysFS::try_create()
- {
- return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) SysFS));
- }
- SysFS::SysFS() = default;
- SysFS::~SysFS() = default;
- ErrorOr<void> SysFS::initialize()
- {
- m_root_inode = TRY(SysFSComponentRegistry::the().root_directory().to_inode(*this));
- return {};
- }
- Inode& SysFS::root_inode()
- {
- return *m_root_inode;
- }
- ErrorOr<NonnullLockRefPtr<SysFSInode>> SysFSInode::try_create(SysFS const& fs, SysFSComponent const& component)
- {
- return adopt_nonnull_lock_ref_or_enomem(new (nothrow) SysFSInode(fs, component));
- }
- SysFSInode::SysFSInode(SysFS const& fs, SysFSComponent const& component)
- : Inode(const_cast<SysFS&>(fs), component.component_index())
- , m_associated_component(component)
- {
- }
- void SysFSInode::did_seek(OpenFileDescription& description, off_t new_offset)
- {
- if (new_offset != 0)
- return;
- auto result = m_associated_component->refresh_data(description);
- if (result.is_error()) {
- // Subsequent calls to read will return EIO!
- dbgln("SysFS: Could not refresh contents: {}", result.error());
- }
- }
- ErrorOr<void> SysFSInode::attach(OpenFileDescription& description)
- {
- return m_associated_component->refresh_data(description);
- }
- ErrorOr<size_t> SysFSInode::read_bytes_locked(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription* fd) const
- {
- return m_associated_component->read_bytes(offset, count, buffer, fd);
- }
- ErrorOr<void> SysFSInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const
- {
- VERIFY_NOT_REACHED();
- }
- ErrorOr<NonnullLockRefPtr<Inode>> SysFSInode::lookup(StringView)
- {
- VERIFY_NOT_REACHED();
- }
- InodeMetadata SysFSInode::metadata() const
- {
- // NOTE: No locking required as m_associated_component or its component index will never change during our lifetime.
- InodeMetadata metadata;
- metadata.inode = { fsid(), m_associated_component->component_index() };
- metadata.mode = S_IFREG | m_associated_component->permissions();
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = m_associated_component->size();
- metadata.mtime = TimeManagement::boot_time();
- return metadata;
- }
- ErrorOr<void> SysFSInode::flush_metadata()
- {
- return {};
- }
- ErrorOr<size_t> SysFSInode::write_bytes_locked(off_t offset, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription* fd)
- {
- return m_associated_component->write_bytes(offset, count, buffer, fd);
- }
- ErrorOr<NonnullLockRefPtr<Inode>> SysFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
- {
- return EROFS;
- }
- ErrorOr<void> SysFSInode::add_child(Inode&, StringView, mode_t)
- {
- return EROFS;
- }
- ErrorOr<void> SysFSInode::remove_child(StringView)
- {
- return EROFS;
- }
- ErrorOr<void> SysFSInode::chmod(mode_t)
- {
- return EPERM;
- }
- ErrorOr<void> SysFSInode::chown(UserID, GroupID)
- {
- return EPERM;
- }
- ErrorOr<void> SysFSInode::truncate(u64 size)
- {
- return m_associated_component->truncate(size);
- }
- ErrorOr<void> SysFSInode::update_timestamps(Optional<time_t>, Optional<time_t>, Optional<time_t>)
- {
- return {};
- }
- ErrorOr<NonnullLockRefPtr<SysFSLinkInode>> SysFSLinkInode::try_create(SysFS const& sysfs, SysFSComponent const& component)
- {
- return adopt_nonnull_lock_ref_or_enomem(new (nothrow) SysFSLinkInode(sysfs, component));
- }
- SysFSLinkInode::SysFSLinkInode(SysFS const& fs, SysFSComponent const& component)
- : SysFSInode(fs, component)
- {
- }
- SysFSLinkInode::~SysFSLinkInode() = default;
- InodeMetadata SysFSLinkInode::metadata() const
- {
- // NOTE: No locking required as m_associated_component or its component index will never change during our lifetime.
- InodeMetadata metadata;
- metadata.inode = { fsid(), m_associated_component->component_index() };
- metadata.mode = S_IFLNK | S_IRUSR | S_IRGRP | S_IROTH | S_IXOTH;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = TimeManagement::boot_time();
- return metadata;
- }
- ErrorOr<NonnullLockRefPtr<SysFSDirectoryInode>> SysFSDirectoryInode::try_create(SysFS const& sysfs, SysFSComponent const& component)
- {
- return adopt_nonnull_lock_ref_or_enomem(new (nothrow) SysFSDirectoryInode(sysfs, component));
- }
- SysFSDirectoryInode::SysFSDirectoryInode(SysFS const& fs, SysFSComponent const& component)
- : SysFSInode(fs, component)
- {
- }
- SysFSDirectoryInode::~SysFSDirectoryInode() = default;
- InodeMetadata SysFSDirectoryInode::metadata() const
- {
- // NOTE: No locking required as m_associated_component or its component index will never change during our lifetime.
- InodeMetadata metadata;
- metadata.inode = { fsid(), m_associated_component->component_index() };
- metadata.mode = S_IFDIR | S_IRUSR | S_IRGRP | S_IROTH | S_IXOTH;
- metadata.uid = 0;
- metadata.gid = 0;
- metadata.size = 0;
- metadata.mtime = TimeManagement::boot_time();
- return metadata;
- }
- ErrorOr<void> SysFSDirectoryInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
- {
- MutexLocker locker(fs().m_lock);
- return m_associated_component->traverse_as_directory(fs().fsid(), move(callback));
- }
- ErrorOr<NonnullLockRefPtr<Inode>> SysFSDirectoryInode::lookup(StringView name)
- {
- MutexLocker locker(fs().m_lock);
- auto component = m_associated_component->lookup(name);
- if (!component)
- return ENOENT;
- return TRY(component->to_inode(fs()));
- }
- }
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