diff options
Diffstat (limited to 'kernel/kernel/filesystem/ext2/inode.cpp')
| -rw-r--r-- | kernel/kernel/filesystem/ext2/inode.cpp | 41 |
1 files changed, 38 insertions, 3 deletions
diff --git a/kernel/kernel/filesystem/ext2/inode.cpp b/kernel/kernel/filesystem/ext2/inode.cpp index 6dadbec5..e873d446 100644 --- a/kernel/kernel/filesystem/ext2/inode.cpp +++ b/kernel/kernel/filesystem/ext2/inode.cpp @@ -76,10 +76,45 @@ namespace kernel::filesystem::ext2 return bytes_read; } - auto inode::write(void const *, size_t, size_t) -> kstd::result<size_t> + auto inode::write(void const * buffer, size_t offset, size_t size) -> kstd::result<size_t> { - kapi::system::panic("[EXT2] inode::write is not implemented yet"); - return 0; + auto const max_writable = this->size() - offset; + auto const requested_size = std::min(size, max_writable); + + auto block_index = offset / m_filesystem->block_size(); + auto in_block_offset = offset % m_filesystem->block_size(); + + auto bytes_written = 0uz; + + while (bytes_written < requested_size) + { + auto const block_number = m_filesystem->map_inode_block_index_to_global_block_number(block_index, m_data); + // TODO BA-FS26 if blocknumber == 0 --> handle sparse file + if (!block_number) + { + kstd::failure(block_number.error()); + } + + auto const bytes_to_write = + std::min(requested_size - bytes_written, m_filesystem->block_size() - in_block_offset); + + auto const block_start_offset = block_number.value() * m_filesystem->block_size(); + auto const write_offset = block_start_offset + in_block_offset; + + auto const write_result = m_filesystem->backing_inode()->write( + static_cast<uint8_t const *>(buffer) + bytes_written, write_offset, bytes_to_write); + if (!write_result) + { + return kstd::failure(write_result.error()); + } + + bytes_written += write_result.value(); + + block_index++; + in_block_offset = 0; // After the first block, we always start at the beginning of the block + } + + return bytes_written; } [[nodiscard]] auto inode::data() const -> inode_data const & |