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https://github.com/LadybirdBrowser/ladybird.git
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280694bb46
Instead of having three separate APIs (one for each timestamp), there's now only Inode::update_timestamps() and it takes 3x optional timestamps. The non-empty timestamps are updated while holding the inode mutex, and the outside world no longer has to look at intermediate timestamp states.
639 lines
21 KiB
C++
639 lines
21 KiB
C++
/*
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "ISO9660FileSystem.h"
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#include <AK/CharacterTypes.h>
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#include <AK/Endian.h>
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#include <AK/HashFunctions.h>
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#include <AK/OwnPtr.h>
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#include <AK/StringHash.h>
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#include <AK/StringView.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/BlockBasedFileSystem.h>
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#include <Kernel/Forward.h>
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#include <Kernel/KBuffer.h>
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#include <Kernel/Library/LockRefPtr.h>
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#include <Kernel/Library/NonnullLockRefPtr.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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// NOTE: According to the spec, logical blocks 0 to 15 are system use.
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constexpr u32 first_data_area_block = 16;
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constexpr u32 logical_sector_size = 2048;
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constexpr u32 max_cached_directory_entries = 128;
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struct DirectoryState {
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LockRefPtr<ISO9660FS::DirectoryEntry> entry;
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u32 offset { 0 };
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};
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class ISO9660DirectoryIterator {
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public:
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ISO9660DirectoryIterator(ISO9660FS& fs, ISO::DirectoryRecordHeader const& header)
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: m_fs(fs)
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, m_current_header(&header)
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{
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// FIXME: Panic or alternative method?
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(void)read_directory_contents();
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get_header();
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}
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ISO::DirectoryRecordHeader const* operator*() { return m_current_header; }
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// Recurses into subdirectories. May fail.
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ErrorOr<bool> next()
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{
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if (done())
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return false;
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dbgln_if(ISO9660_VERY_DEBUG, "next(): Called");
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if (has_flag(m_current_header->file_flags, ISO::FileFlags::Directory)) {
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dbgln_if(ISO9660_VERY_DEBUG, "next(): Recursing");
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{
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TRY(m_directory_stack.try_append(move(m_current_directory)));
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}
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dbgln_if(ISO9660_VERY_DEBUG, "next(): Pushed into directory stack");
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TRY(read_directory_contents());
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dbgln_if(ISO9660_VERY_DEBUG, "next(): Read directory contents");
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m_current_directory.offset = 0;
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get_header();
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if (m_current_header->length == 0) {
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// We have found an empty directory, let's continue with the
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// next one.
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if (!go_up())
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return false;
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} else {
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// We cannot skip here, as this is the first record in this
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// extent.
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return true;
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}
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}
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return skip();
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}
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// Skips to the directory in the list, returns whether there was a next one.
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// No allocation here, cannot fail.
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bool skip()
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{
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VERIFY(m_current_directory.entry);
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if (m_current_directory.offset >= m_current_directory.entry->length) {
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dbgln_if(ISO9660_VERY_DEBUG, "skip(): Was at last item already");
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return false;
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}
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m_current_directory.offset += m_current_header->length;
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get_header();
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if (m_current_header->length == 0) {
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// According to ECMA 119, if a logical block contains directory
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// records, then the leftover bytes in the logical block are
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// all zeros. So if our directory header has a length of 0,
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// we're probably looking at padding.
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//
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// Of course, this doesn't mean we're done; it only means that there
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// are no more directory entries in *this* logical block. If we
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// have at least one more logical block of data length to go, we
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// need to snap to the next logical block, because directory records
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// cannot span multiple logical blocks.
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u32 remaining_bytes = m_current_directory.entry->length - m_current_directory.offset;
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if (remaining_bytes > m_fs.logical_block_size()) {
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m_current_directory.offset += remaining_bytes % m_fs.logical_block_size();
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get_header();
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dbgln_if(ISO9660_VERY_DEBUG, "skip(): Snapped to next logical block (succeeded)");
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return true;
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}
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dbgln_if(ISO9660_VERY_DEBUG, "skip(): Was at the last logical block, at padding now (offset {}, data length {})", m_current_directory.entry->length, m_current_directory.offset);
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return false;
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}
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dbgln_if(ISO9660_VERY_DEBUG, "skip(): Skipped to next item");
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return true;
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}
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bool go_up()
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{
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if (m_directory_stack.is_empty()) {
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dbgln_if(ISO9660_VERY_DEBUG, "go_up(): Empty directory stack");
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return false;
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}
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m_current_directory = m_directory_stack.take_last();
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get_header();
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dbgln_if(ISO9660_VERY_DEBUG, "go_up(): Went up a directory");
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return true;
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}
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bool done() const
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{
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VERIFY(m_current_directory.entry);
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auto result = m_directory_stack.is_empty() && m_current_directory.offset >= m_current_directory.entry->length;
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dbgln_if(ISO9660_VERY_DEBUG, "done(): {}", result);
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return result;
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}
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private:
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ErrorOr<void> read_directory_contents()
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{
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m_current_directory.entry = TRY(m_fs.directory_entry_for_record({}, m_current_header));
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return {};
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}
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void get_header()
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{
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VERIFY(m_current_directory.entry);
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if (!m_current_directory.entry->blocks)
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return;
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m_current_header = reinterpret_cast<ISO::DirectoryRecordHeader const*>(m_current_directory.entry->blocks->data() + m_current_directory.offset);
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}
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ISO9660FS& m_fs;
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DirectoryState m_current_directory;
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ISO::DirectoryRecordHeader const* m_current_header { nullptr };
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Vector<DirectoryState> m_directory_stack;
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};
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ErrorOr<NonnullLockRefPtr<FileSystem>> ISO9660FS::try_create(OpenFileDescription& description)
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{
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return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) ISO9660FS(description)));
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}
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ISO9660FS::ISO9660FS(OpenFileDescription& description)
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: BlockBasedFileSystem(description)
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{
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set_block_size(logical_sector_size);
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m_logical_block_size = logical_sector_size;
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}
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ISO9660FS::~ISO9660FS() = default;
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ErrorOr<void> ISO9660FS::initialize()
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{
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TRY(BlockBasedFileSystem::initialize());
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TRY(parse_volume_set());
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TRY(create_root_inode());
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return {};
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}
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Inode& ISO9660FS::root_inode()
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{
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VERIFY(!m_root_inode.is_null());
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return *m_root_inode;
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}
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unsigned ISO9660FS::total_block_count() const
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{
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return LittleEndian { m_primary_volume->volume_space_size.little };
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}
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unsigned ISO9660FS::total_inode_count() const
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{
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if (!m_cached_inode_count) {
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auto result = calculate_inode_count();
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if (result.is_error()) {
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// FIXME: This should be able to return a ErrorOr<void>.
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return 0;
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}
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}
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return m_cached_inode_count;
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}
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u8 ISO9660FS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
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{
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if (has_flag(static_cast<ISO::FileFlags>(entry.file_type), ISO::FileFlags::Directory)) {
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return DT_DIR;
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}
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return DT_REG;
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}
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ErrorOr<void> ISO9660FS::parse_volume_set()
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{
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VERIFY(!m_primary_volume);
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auto block = TRY(KBuffer::try_create_with_size("ISO9660FS: Temporary volume descriptor storage"sv, m_logical_block_size, Memory::Region::Access::Read | Memory::Region::Access::Write));
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auto block_buffer = UserOrKernelBuffer::for_kernel_buffer(block->data());
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auto current_block_index = first_data_area_block;
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while (true) {
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auto result = raw_read(BlockIndex { current_block_index }, block_buffer);
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if (result.is_error()) {
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dbgln_if(ISO9660_DEBUG, "Failed to read volume descriptor from ISO file: {}", result.error());
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return result;
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}
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auto const* header = reinterpret_cast<ISO::VolumeDescriptorHeader const*>(block->data());
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if (StringView { header->identifier, 5 } != "CD001"sv) {
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dbgln_if(ISO9660_DEBUG, "Header magic at volume descriptor {} is not valid", current_block_index - first_data_area_block);
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return EIO;
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}
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switch (header->type) {
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case ISO::VolumeDescriptorType::PrimaryVolumeDescriptor: {
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auto const* primary_volume = reinterpret_cast<ISO::PrimaryVolumeDescriptor const*>(header);
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m_primary_volume = adopt_own_if_nonnull(new ISO::PrimaryVolumeDescriptor(*primary_volume));
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break;
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}
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case ISO::VolumeDescriptorType::BootRecord:
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case ISO::VolumeDescriptorType::SupplementaryOrEnhancedVolumeDescriptor:
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case ISO::VolumeDescriptorType::VolumePartitionDescriptor: {
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break;
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}
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case ISO::VolumeDescriptorType::VolumeDescriptorSetTerminator: {
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goto all_headers_read;
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}
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default:
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dbgln_if(ISO9660_DEBUG, "Unexpected volume descriptor type {} in volume set", static_cast<u8>(header->type));
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return EIO;
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}
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current_block_index++;
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}
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all_headers_read:
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if (!m_primary_volume) {
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dbgln_if(ISO9660_DEBUG, "Could not find primary volume");
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return EIO;
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}
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m_logical_block_size = LittleEndian { m_primary_volume->logical_block_size.little };
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return {};
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}
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ErrorOr<void> ISO9660FS::create_root_inode()
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{
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if (!m_primary_volume) {
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dbgln_if(ISO9660_DEBUG, "Primary volume doesn't exist, can't create root inode");
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return EIO;
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}
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m_root_inode = TRY(ISO9660Inode::try_create_from_directory_record(*this, m_primary_volume->root_directory_record_header, {}));
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return {};
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}
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ErrorOr<void> ISO9660FS::calculate_inode_count() const
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{
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if (!m_primary_volume) {
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dbgln_if(ISO9660_DEBUG, "Primary volume doesn't exist, can't calculate inode count");
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return EIO;
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}
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size_t inode_count = 1;
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TRY(visit_directory_record(m_primary_volume->root_directory_record_header, [&](ISO::DirectoryRecordHeader const* header) {
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if (header == nullptr) {
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return RecursionDecision::Continue;
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}
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inode_count += 1;
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if (has_flag(header->file_flags, ISO::FileFlags::Directory)) {
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if (header->file_identifier_length == 1) {
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auto file_identifier = reinterpret_cast<u8 const*>(header + 1);
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if (file_identifier[0] == '\0' || file_identifier[0] == '\1') {
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return RecursionDecision::Continue;
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}
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}
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return RecursionDecision::Recurse;
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}
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return RecursionDecision::Continue;
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}));
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m_cached_inode_count = inode_count;
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return {};
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}
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ErrorOr<void> ISO9660FS::visit_directory_record(ISO::DirectoryRecordHeader const& record, Function<ErrorOr<RecursionDecision>(ISO::DirectoryRecordHeader const*)> const& visitor) const
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{
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if (!has_flag(record.file_flags, ISO::FileFlags::Directory)) {
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return {};
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}
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ISO9660DirectoryIterator iterator { const_cast<ISO9660FS&>(*this), record };
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while (!iterator.done()) {
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auto decision = TRY(visitor(*iterator));
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switch (decision) {
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case RecursionDecision::Recurse: {
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auto has_moved = TRY(iterator.next());
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if (!has_moved) {
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// If next() hasn't moved then we have read through all the
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// directories, and can exit.
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return {};
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}
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continue;
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}
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case RecursionDecision::Continue: {
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while (!iterator.done()) {
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if (iterator.skip())
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break;
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if (!iterator.go_up())
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return {};
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}
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continue;
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}
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case RecursionDecision::Break:
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return {};
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}
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}
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return {};
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}
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ErrorOr<NonnullLockRefPtr<ISO9660FS::DirectoryEntry>> ISO9660FS::directory_entry_for_record(Badge<ISO9660DirectoryIterator>, ISO::DirectoryRecordHeader const* record)
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{
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u32 extent_location = LittleEndian { record->extent_location.little };
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u32 data_length = LittleEndian { record->data_length.little };
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auto key = calculate_directory_entry_cache_key(*record);
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auto it = m_directory_entry_cache.find(key);
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if (it != m_directory_entry_cache.end()) {
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dbgln_if(ISO9660_DEBUG, "Cache hit for dirent @ {}", extent_location);
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return it->value;
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}
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dbgln_if(ISO9660_DEBUG, "Cache miss for dirent @ {} :^(", extent_location);
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if (m_directory_entry_cache.size() == max_cached_directory_entries) {
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// FIXME: A smarter algorithm would probably be nicer.
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m_directory_entry_cache.remove(m_directory_entry_cache.begin());
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}
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if (!(data_length % logical_block_size() == 0)) {
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dbgln_if(ISO9660_DEBUG, "Found a directory with non-logical block size aligned data length!");
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return EIO;
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}
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auto blocks = TRY(KBuffer::try_create_with_size("ISO9660FS: Directory traversal buffer"sv, data_length, Memory::Region::Access::Read | Memory::Region::Access::Write));
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auto blocks_buffer = UserOrKernelBuffer::for_kernel_buffer(blocks->data());
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TRY(raw_read_blocks(BlockBasedFileSystem::BlockIndex { extent_location }, data_length / logical_block_size(), blocks_buffer));
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auto entry = TRY(DirectoryEntry::try_create(extent_location, data_length, move(blocks)));
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m_directory_entry_cache.set(key, entry);
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dbgln_if(ISO9660_DEBUG, "Cached dirent @ {}", extent_location);
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return entry;
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}
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u32 ISO9660FS::calculate_directory_entry_cache_key(ISO::DirectoryRecordHeader const& record)
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{
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return LittleEndian { record.extent_location.little };
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}
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ErrorOr<size_t> ISO9660Inode::read_bytes(off_t offset, size_t size, UserOrKernelBuffer& buffer, OpenFileDescription*) const
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{
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MutexLocker inode_locker(m_inode_lock);
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u32 data_length = LittleEndian { m_record.data_length.little };
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u32 extent_location = LittleEndian { m_record.extent_location.little };
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if (static_cast<u64>(offset) >= data_length)
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return 0;
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auto block = TRY(KBuffer::try_create_with_size("ISO9660FS: Inode read buffer"sv, fs().m_logical_block_size));
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auto block_buffer = UserOrKernelBuffer::for_kernel_buffer(block->data());
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size_t total_bytes = min(size, data_length - offset);
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size_t nread = 0;
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size_t blocks_already_read = offset / fs().m_logical_block_size;
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size_t initial_offset = offset % fs().m_logical_block_size;
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auto current_block_index = BlockBasedFileSystem::BlockIndex { extent_location + blocks_already_read };
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while (nread != total_bytes) {
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size_t bytes_to_read = min(total_bytes - nread, fs().logical_block_size() - initial_offset);
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auto buffer_offset = buffer.offset(nread);
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dbgln_if(ISO9660_VERY_DEBUG, "ISO9660Inode::read_bytes: Reading {} bytes into buffer offset {}/{}, logical block index: {}", bytes_to_read, nread, total_bytes, current_block_index.value());
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TRY(const_cast<ISO9660FS&>(fs()).raw_read(current_block_index, block_buffer));
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TRY(buffer_offset.write(block->data() + initial_offset, bytes_to_read));
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nread += bytes_to_read;
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initial_offset = 0;
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current_block_index = BlockBasedFileSystem::BlockIndex { current_block_index.value() + 1 };
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}
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return nread;
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}
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InodeMetadata ISO9660Inode::metadata() const
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{
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return m_metadata;
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}
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ErrorOr<void> ISO9660Inode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> visitor) const
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{
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Array<u8, max_file_identifier_length> file_identifier_buffer;
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ErrorOr<void> result;
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return fs().visit_directory_record(m_record, [&](ISO::DirectoryRecordHeader const* record) {
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StringView filename = get_normalized_filename(*record, file_identifier_buffer);
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dbgln_if(ISO9660_VERY_DEBUG, "traverse_as_directory(): Found {}", filename);
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InodeIdentifier id { fsid(), get_inode_index(*record, filename) };
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auto entry = FileSystem::DirectoryEntryView(filename, id, static_cast<u8>(record->file_flags));
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result = visitor(entry);
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if (result.is_error())
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return RecursionDecision::Break;
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return RecursionDecision::Continue;
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});
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}
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ErrorOr<NonnullLockRefPtr<Inode>> ISO9660Inode::lookup(StringView name)
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{
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LockRefPtr<Inode> inode;
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Array<u8, max_file_identifier_length> file_identifier_buffer;
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TRY(fs().visit_directory_record(m_record, [&](ISO::DirectoryRecordHeader const* record) {
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StringView filename = get_normalized_filename(*record, file_identifier_buffer);
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if (filename == name) {
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auto maybe_inode = ISO9660Inode::try_create_from_directory_record(fs(), *record, filename);
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if (maybe_inode.is_error()) {
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// FIXME: The Inode API does not handle allocation failures very
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// well... we can't return a ErrorOr from here. It
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// would be nice if we could return a ErrorOr<void>(Or) from
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// any place where allocation may happen.
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dbgln("Could not allocate inode for lookup!");
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} else {
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inode = maybe_inode.release_value();
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}
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return RecursionDecision::Break;
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}
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return RecursionDecision::Continue;
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}));
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if (!inode)
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|
return ENOENT;
|
|
return inode.release_nonnull();
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::flush_metadata()
|
|
{
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<size_t> ISO9660Inode::write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<NonnullLockRefPtr<Inode>> ISO9660Inode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::add_child(Inode&, StringView, mode_t)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::remove_child(StringView)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::chmod(mode_t)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::chown(UserID, GroupID)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::truncate(u64)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ErrorOr<void> ISO9660Inode::update_timestamps(Optional<time_t>, Optional<time_t>, Optional<time_t>)
|
|
{
|
|
return EROFS;
|
|
}
|
|
|
|
ISO9660Inode::ISO9660Inode(ISO9660FS& fs, ISO::DirectoryRecordHeader const& record, StringView name)
|
|
: Inode(fs, get_inode_index(record, name))
|
|
, m_record(record)
|
|
{
|
|
dbgln_if(ISO9660_VERY_DEBUG, "Creating inode #{}", index());
|
|
create_metadata();
|
|
}
|
|
|
|
ISO9660Inode::~ISO9660Inode() = default;
|
|
|
|
ErrorOr<NonnullLockRefPtr<ISO9660Inode>> ISO9660Inode::try_create_from_directory_record(ISO9660FS& fs, ISO::DirectoryRecordHeader const& record, StringView name)
|
|
{
|
|
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) ISO9660Inode(fs, record, name));
|
|
}
|
|
|
|
void ISO9660Inode::create_metadata()
|
|
{
|
|
u32 data_length = LittleEndian { m_record.data_length.little };
|
|
bool is_directory = has_flag(m_record.file_flags, ISO::FileFlags::Directory);
|
|
time_t recorded_at = parse_numerical_date_time(m_record.recording_date_and_time);
|
|
|
|
m_metadata = {
|
|
.inode = identifier(),
|
|
.size = data_length,
|
|
.mode = static_cast<mode_t>((is_directory ? S_IFDIR : S_IFREG) | (is_directory ? 0555 : 0444)),
|
|
.uid = 0,
|
|
.gid = 0,
|
|
.link_count = 1,
|
|
.atime = recorded_at,
|
|
.ctime = recorded_at,
|
|
.mtime = recorded_at,
|
|
.dtime = 0,
|
|
.block_count = 0,
|
|
.block_size = 0,
|
|
.major_device = 0,
|
|
.minor_device = 0,
|
|
};
|
|
}
|
|
|
|
time_t ISO9660Inode::parse_numerical_date_time(ISO::NumericalDateAndTime const& date)
|
|
{
|
|
i32 year_offset = date.years_since_1900 - 70;
|
|
|
|
return (year_offset * 60 * 60 * 24 * 30 * 12)
|
|
+ (date.month * 60 * 60 * 24 * 30)
|
|
+ (date.day * 60 * 60 * 24)
|
|
+ (date.hour * 60 * 60)
|
|
+ (date.minute * 60)
|
|
+ date.second;
|
|
}
|
|
|
|
StringView ISO9660Inode::get_normalized_filename(ISO::DirectoryRecordHeader const& record, Bytes buffer)
|
|
{
|
|
auto const* file_identifier = reinterpret_cast<u8 const*>(&record + 1);
|
|
auto filename = StringView { file_identifier, record.file_identifier_length };
|
|
|
|
if (filename.length() == 1) {
|
|
if (filename[0] == '\0') {
|
|
filename = "."sv;
|
|
}
|
|
|
|
if (filename[0] == '\1') {
|
|
filename = ".."sv;
|
|
}
|
|
}
|
|
|
|
if (!has_flag(record.file_flags, ISO::FileFlags::Directory)) {
|
|
// FIXME: We currently strip the file version from the filename,
|
|
// but that may be used later down the line if the file actually
|
|
// has multiple versions on the disk.
|
|
Optional<size_t> semicolon = filename.find(';');
|
|
if (semicolon.has_value()) {
|
|
filename = filename.substring_view(0, semicolon.value());
|
|
}
|
|
|
|
if (filename[filename.length() - 1] == '.') {
|
|
filename = filename.substring_view(0, filename.length() - 1);
|
|
}
|
|
}
|
|
|
|
if (filename.length() > buffer.size()) {
|
|
// FIXME: Rock Ridge allows filenames up to 255 characters, so we should
|
|
// probably support that instead of truncating.
|
|
filename = filename.substring_view(0, buffer.size());
|
|
}
|
|
|
|
for (size_t i = 0; i < filename.length(); i++) {
|
|
buffer[i] = to_ascii_lowercase(filename[i]);
|
|
}
|
|
|
|
return { buffer.data(), filename.length() };
|
|
}
|
|
|
|
InodeIndex ISO9660Inode::get_inode_index(ISO::DirectoryRecordHeader const& record, StringView name)
|
|
{
|
|
if (name.is_null()) {
|
|
// NOTE: This is the index of the root inode.
|
|
return 1;
|
|
}
|
|
|
|
return { pair_int_hash(LittleEndian { record.extent_location.little }, string_hash(name.characters_without_null_termination(), name.length())) };
|
|
}
|
|
|
|
}
|