mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 12:42:45 +00:00
673592dea8
There was only one permanent storage location for these: as a member in the Mount class. That member is never modified after Mount initialization, so we don't need to worry about races there.
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
/*
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* Copyright (c) 2022, Undefine <undefine@undefine.pl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/FATFS/FileSystem.h>
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#include <Kernel/FileSystem/FATFS/Inode.h>
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namespace Kernel {
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ErrorOr<NonnullRefPtr<FileSystem>> FATFS::try_create(OpenFileDescription& file_description)
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{
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return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) FATFS(file_description)));
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}
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FATFS::FATFS(OpenFileDescription& file_description)
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: BlockBasedFileSystem(file_description)
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{
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}
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bool FATFS::is_initialized_while_locked()
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{
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VERIFY(m_lock.is_locked());
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return !m_root_inode.is_null();
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}
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ErrorOr<void> FATFS::initialize_while_locked()
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{
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VERIFY(m_lock.is_locked());
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VERIFY(!is_initialized_while_locked());
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m_boot_record = TRY(KBuffer::try_create_with_size("FATFS: Boot Record"sv, m_logical_block_size));
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auto boot_record_buffer = UserOrKernelBuffer::for_kernel_buffer(m_boot_record->data());
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TRY(raw_read(0, boot_record_buffer));
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if constexpr (FAT_DEBUG) {
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dbgln("FATFS: oem_identifier: {}", boot_record()->oem_identifier);
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dbgln("FATFS: bytes_per_sector: {}", boot_record()->bytes_per_sector);
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dbgln("FATFS: sectors_per_cluster: {}", boot_record()->sectors_per_cluster);
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dbgln("FATFS: reserved_sector_count: {}", boot_record()->reserved_sector_count);
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dbgln("FATFS: fat_count: {}", boot_record()->fat_count);
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dbgln("FATFS: root_directory_entry_count: {}", boot_record()->root_directory_entry_count);
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dbgln("FATFS: media_descriptor_type: {}", boot_record()->media_descriptor_type);
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dbgln("FATFS: sectors_per_track: {}", boot_record()->sectors_per_track);
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dbgln("FATFS: head_count: {}", boot_record()->head_count);
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dbgln("FATFS: hidden_sector_count: {}", boot_record()->hidden_sector_count);
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dbgln("FATFS: sector_count: {}", boot_record()->sector_count);
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dbgln("FATFS: sectors_per_fat: {}", boot_record()->sectors_per_fat);
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dbgln("FATFS: flags: {}", boot_record()->flags);
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dbgln("FATFS: fat_version: {}", boot_record()->fat_version);
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dbgln("FATFS: root_directory_cluster: {}", boot_record()->root_directory_cluster);
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dbgln("FATFS: fs_info_sector: {}", boot_record()->fs_info_sector);
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dbgln("FATFS: backup_boot_sector: {}", boot_record()->backup_boot_sector);
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dbgln("FATFS: drive_number: {}", boot_record()->drive_number);
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dbgln("FATFS: volume_id: {}", boot_record()->volume_id);
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}
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if (boot_record()->signature != signature_1 && boot_record()->signature != signature_2) {
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dbgln("FATFS: Invalid signature");
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return EINVAL;
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}
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m_logical_block_size = boot_record()->bytes_per_sector;
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set_block_size(m_logical_block_size);
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u32 root_directory_sectors = ((boot_record()->root_directory_entry_count * sizeof(FATEntry)) + (m_logical_block_size - 1)) / m_logical_block_size;
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m_first_data_sector = boot_record()->reserved_sector_count + (boot_record()->fat_count * boot_record()->sectors_per_fat) + root_directory_sectors;
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TRY(BlockBasedFileSystem::initialize_while_locked());
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FATEntry root_entry {};
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root_entry.first_cluster_low = boot_record()->root_directory_cluster & 0xFFFF;
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root_entry.first_cluster_high = boot_record()->root_directory_cluster >> 16;
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root_entry.attributes = FATAttributes::Directory;
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m_root_inode = TRY(FATInode::create(*this, root_entry));
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return {};
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}
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Inode& FATFS::root_inode()
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{
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return *m_root_inode;
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}
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BlockBasedFileSystem::BlockIndex FATFS::first_block_of_cluster(u32 cluster) const
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{
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return ((cluster - first_data_cluster) * boot_record()->sectors_per_cluster) + m_first_data_sector;
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}
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}
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