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- /*
- * Copyright (c) 2022, Undefine <undefine@undefine.pl>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <Kernel/Debug.h>
- #include <Kernel/FileSystem/FATFS/FileSystem.h>
- #include <Kernel/FileSystem/FATFS/Inode.h>
- namespace Kernel {
- ErrorOr<NonnullLockRefPtr<FileSystem>> FATFS::try_create(OpenFileDescription& file_description)
- {
- return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) FATFS(file_description)));
- }
- FATFS::FATFS(OpenFileDescription& file_description)
- : BlockBasedFileSystem(file_description)
- {
- }
- bool FATFS::is_initialized_while_locked()
- {
- VERIFY(m_lock.is_locked());
- return !m_root_inode.is_null();
- }
- ErrorOr<void> FATFS::initialize_while_locked()
- {
- VERIFY(m_lock.is_locked());
- VERIFY(!is_initialized_while_locked());
- m_boot_record = TRY(KBuffer::try_create_with_size("FATFS: Boot Record"sv, m_logical_block_size));
- auto boot_record_buffer = UserOrKernelBuffer::for_kernel_buffer(m_boot_record->data());
- TRY(raw_read(0, boot_record_buffer));
- if constexpr (FAT_DEBUG) {
- dbgln("FATFS: oem_identifier: {}", boot_record()->oem_identifier);
- dbgln("FATFS: bytes_per_sector: {}", boot_record()->bytes_per_sector);
- dbgln("FATFS: sectors_per_cluster: {}", boot_record()->sectors_per_cluster);
- dbgln("FATFS: reserved_sector_count: {}", boot_record()->reserved_sector_count);
- dbgln("FATFS: fat_count: {}", boot_record()->fat_count);
- dbgln("FATFS: root_directory_entry_count: {}", boot_record()->root_directory_entry_count);
- dbgln("FATFS: media_descriptor_type: {}", boot_record()->media_descriptor_type);
- dbgln("FATFS: sectors_per_track: {}", boot_record()->sectors_per_track);
- dbgln("FATFS: head_count: {}", boot_record()->head_count);
- dbgln("FATFS: hidden_sector_count: {}", boot_record()->hidden_sector_count);
- dbgln("FATFS: sector_count: {}", boot_record()->sector_count);
- dbgln("FATFS: sectors_per_fat: {}", boot_record()->sectors_per_fat);
- dbgln("FATFS: flags: {}", boot_record()->flags);
- dbgln("FATFS: fat_version: {}", boot_record()->fat_version);
- dbgln("FATFS: root_directory_cluster: {}", boot_record()->root_directory_cluster);
- dbgln("FATFS: fs_info_sector: {}", boot_record()->fs_info_sector);
- dbgln("FATFS: backup_boot_sector: {}", boot_record()->backup_boot_sector);
- dbgln("FATFS: drive_number: {}", boot_record()->drive_number);
- dbgln("FATFS: volume_id: {}", boot_record()->volume_id);
- }
- if (boot_record()->signature != signature_1 && boot_record()->signature != signature_2) {
- dbgln("FATFS: Invalid signature");
- return EINVAL;
- }
- m_logical_block_size = boot_record()->bytes_per_sector;
- set_block_size(m_logical_block_size);
- u32 root_directory_sectors = ((boot_record()->root_directory_entry_count * sizeof(FATEntry)) + (m_logical_block_size - 1)) / m_logical_block_size;
- m_first_data_sector = boot_record()->reserved_sector_count + (boot_record()->fat_count * boot_record()->sectors_per_fat) + root_directory_sectors;
- TRY(BlockBasedFileSystem::initialize_while_locked());
- FATEntry root_entry {};
- root_entry.first_cluster_low = boot_record()->root_directory_cluster & 0xFFFF;
- root_entry.first_cluster_high = boot_record()->root_directory_cluster >> 16;
- root_entry.attributes = FATAttributes::Directory;
- m_root_inode = TRY(FATInode::create(*this, root_entry));
- return {};
- }
- Inode& FATFS::root_inode()
- {
- return *m_root_inode;
- }
- BlockBasedFileSystem::BlockIndex FATFS::first_block_of_cluster(u32 cluster) const
- {
- return ((cluster - first_data_cluster) * boot_record()->sectors_per_cluster) + m_first_data_sector;
- }
- }
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