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Kernel/FATFS: Initialize special directory entries

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implicitfield
2024-04-07 15:45:34 +03:00
committed by Tim Schumacher
parent 66e1f8812f
commit bd76dd2dc2
1 changed files with 25 additions and 0 deletions
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25
Kernel/FileSystem/FATFS/Inode.cpp
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@@ -557,6 +557,31 @@ ErrorOr<NonnullRefPtr<Inode>> FATInode::create_child(StringView name, mode_t mod
entry.first_cluster_low = allocated_cluster & 0xFFFF;
if (mode & S_IFDIR) {
auto create_directory_entry = [&](StringView entry_name) {
VERIFY(entry_name.length() <= 8);
FATEntry directory_entry {};
memset(directory_entry.filename, ' ', 8);
memset(directory_entry.extension, ' ', 3);
for (size_t i = 0; i < entry_name.length(); ++i)
directory_entry.filename[i] = entry_name[i];
directory_entry.attributes |= FATAttributes::Directory;
return directory_entry;
};
FATEntry current_directory = create_directory_entry("."sv);
current_directory.first_cluster_low = entry.first_cluster_low;
if (fs().m_fat_version == FATVersion::FAT32)
current_directory.first_cluster_high = entry.first_cluster_high;
FATEntry parent_directory = create_directory_entry(".."sv);
auto block = BlockBasedFileSystem::BlockIndex { fs().first_block_of_cluster(allocated_cluster).start_block.value() };
TRY(fs().write_block(block, UserOrKernelBuffer::for_kernel_buffer(bit_cast<u8*>(&current_directory)), sizeof(FATEntry), 0));
TRY(fs().write_block(block, UserOrKernelBuffer::for_kernel_buffer(bit_cast<u8*>(&parent_directory)), sizeof(FATEntry), sizeof(FATEntry)));
}
// FIXME: If we fail here we should clean up the entries we wrote
TRY(fs().write_block(entries[lfn_entries.size()].block, UserOrKernelBuffer::for_kernel_buffer(bit_cast<u8*>(&entry)), sizeof(FATEntry), entries[lfn_entries.size()].entry * sizeof(FATEntry)));