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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<NonnullRefPtr<FileSystem>> SysFS::try_create()
{
return TRY(adopt_nonnull_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<NonnullRefPtr<SysFSInode>> SysFSInode::try_create(SysFS const& fs, SysFSComponent const& component)
{
return adopt_nonnull_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(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<NonnullRefPtr<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(off_t offset, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription* fd)
{
return m_associated_component->write_bytes(offset, count, buffer, fd);
}
ErrorOr<NonnullRefPtr<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::set_mtime(time_t time)
{
return m_associated_component->set_mtime(time);
}
ErrorOr<void> SysFSInode::truncate(u64 size)
{
return m_associated_component->truncate(size);
}
ErrorOr<NonnullRefPtr<SysFSLinkInode>> SysFSLinkInode::try_create(SysFS const& sysfs, SysFSComponent const& component)
{
return adopt_nonnull_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<NonnullRefPtr<SysFSDirectoryInode>> SysFSDirectoryInode::try_create(SysFS const& sysfs, SysFSComponent const& component)
{
return adopt_nonnull_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<NonnullRefPtr<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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