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- /*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- * Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/MemoryStream.h>
- #include <Kernel/API/POSIX/errno.h>
- #include <Kernel/Debug.h>
- #include <Kernel/FileSystem/Ext2FS/Inode.h>
- #include <Kernel/FileSystem/InodeMetadata.h>
- #include <Kernel/UnixTypes.h>
- namespace Kernel {
- static constexpr size_t max_inline_symlink_length = 60;
- static u8 to_ext2_file_type(mode_t mode)
- {
- if (is_regular_file(mode))
- return EXT2_FT_REG_FILE;
- if (is_directory(mode))
- return EXT2_FT_DIR;
- if (is_character_device(mode))
- return EXT2_FT_CHRDEV;
- if (is_block_device(mode))
- return EXT2_FT_BLKDEV;
- if (is_fifo(mode))
- return EXT2_FT_FIFO;
- if (is_socket(mode))
- return EXT2_FT_SOCK;
- if (is_symlink(mode))
- return EXT2_FT_SYMLINK;
- return EXT2_FT_UNKNOWN;
- }
- ErrorOr<void> Ext2FSInode::write_indirect_block(BlockBasedFileSystem::BlockIndex block, Span<BlockBasedFileSystem::BlockIndex> blocks_indices)
- {
- auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- VERIFY(blocks_indices.size() <= entries_per_block);
- auto block_contents = TRY(ByteBuffer::create_zeroed(fs().block_size()));
- FixedMemoryStream stream { block_contents.bytes() };
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(block_contents.data());
- VERIFY(blocks_indices.size() <= EXT2_ADDR_PER_BLOCK(&fs().super_block()));
- for (unsigned i = 0; i < blocks_indices.size(); ++i)
- MUST(stream.write_value<u32>(blocks_indices[i].value()));
- return fs().write_block(block, buffer, block_contents.size());
- }
- ErrorOr<void> Ext2FSInode::grow_doubly_indirect_block(BlockBasedFileSystem::BlockIndex block, size_t old_blocks_length, Span<BlockBasedFileSystem::BlockIndex> blocks_indices, Vector<Ext2FS::BlockIndex>& new_meta_blocks, unsigned& meta_blocks)
- {
- auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- auto const entries_per_doubly_indirect_block = entries_per_block * entries_per_block;
- auto const old_indirect_blocks_length = ceil_div(old_blocks_length, entries_per_block);
- auto const new_indirect_blocks_length = ceil_div(blocks_indices.size(), entries_per_block);
- VERIFY(blocks_indices.size() > 0);
- VERIFY(blocks_indices.size() > old_blocks_length);
- VERIFY(blocks_indices.size() <= entries_per_doubly_indirect_block);
- auto block_contents = TRY(ByteBuffer::create_zeroed(fs().block_size()));
- auto* block_as_pointers = (unsigned*)block_contents.data();
- FixedMemoryStream stream { block_contents.bytes() };
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(block_contents.data());
- if (old_blocks_length > 0) {
- TRY(fs().read_block(block, &buffer, fs().block_size()));
- }
- // Grow the doubly indirect block.
- for (unsigned i = 0; i < old_indirect_blocks_length; i++)
- MUST(stream.write_value<u32>(block_as_pointers[i]));
- for (unsigned i = old_indirect_blocks_length; i < new_indirect_blocks_length; i++) {
- auto new_block = new_meta_blocks.take_last().value();
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::grow_doubly_indirect_block(): Allocating indirect block {} at index {}", identifier(), new_block, i);
- MUST(stream.write_value<u32>(new_block));
- meta_blocks++;
- }
- // Write out the indirect blocks.
- for (unsigned i = old_blocks_length / entries_per_block; i < new_indirect_blocks_length; i++) {
- auto const offset_block = i * entries_per_block;
- TRY(write_indirect_block(block_as_pointers[i], blocks_indices.slice(offset_block, min(blocks_indices.size() - offset_block, entries_per_block))));
- }
- // Write out the doubly indirect block.
- return fs().write_block(block, buffer, block_contents.size());
- }
- ErrorOr<void> Ext2FSInode::shrink_doubly_indirect_block(BlockBasedFileSystem::BlockIndex block, size_t old_blocks_length, size_t new_blocks_length, unsigned& meta_blocks)
- {
- auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- auto const entries_per_doubly_indirect_block = entries_per_block * entries_per_block;
- auto const old_indirect_blocks_length = ceil_div(old_blocks_length, entries_per_block);
- auto const new_indirect_blocks_length = ceil_div(new_blocks_length, entries_per_block);
- VERIFY(old_blocks_length > 0);
- VERIFY(old_blocks_length >= new_blocks_length);
- VERIFY(new_blocks_length <= entries_per_doubly_indirect_block);
- auto block_contents = TRY(ByteBuffer::create_uninitialized(fs().block_size()));
- auto* block_as_pointers = (unsigned*)block_contents.data();
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(block_as_pointers));
- TRY(fs().read_block(block, &buffer, fs().block_size()));
- // Free the unused indirect blocks.
- for (unsigned i = new_indirect_blocks_length; i < old_indirect_blocks_length; i++) {
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::shrink_doubly_indirect_block(): Freeing indirect block {} at index {}", identifier(), block_as_pointers[i], i);
- TRY(fs().set_block_allocation_state(block_as_pointers[i], false));
- meta_blocks--;
- }
- // Free the doubly indirect block if no longer needed.
- if (new_blocks_length == 0) {
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::shrink_doubly_indirect_block(): Freeing doubly indirect block {}", identifier(), block);
- TRY(fs().set_block_allocation_state(block, false));
- meta_blocks--;
- }
- return {};
- }
- ErrorOr<void> Ext2FSInode::grow_triply_indirect_block(BlockBasedFileSystem::BlockIndex block, size_t old_blocks_length, Span<BlockBasedFileSystem::BlockIndex> blocks_indices, Vector<Ext2FS::BlockIndex>& new_meta_blocks, unsigned& meta_blocks)
- {
- auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- auto const entries_per_doubly_indirect_block = entries_per_block * entries_per_block;
- auto const entries_per_triply_indirect_block = entries_per_block * entries_per_block;
- auto const old_doubly_indirect_blocks_length = ceil_div(old_blocks_length, entries_per_doubly_indirect_block);
- auto const new_doubly_indirect_blocks_length = ceil_div(blocks_indices.size(), entries_per_doubly_indirect_block);
- VERIFY(blocks_indices.size() > 0);
- VERIFY(blocks_indices.size() > old_blocks_length);
- VERIFY(blocks_indices.size() <= entries_per_triply_indirect_block);
- auto block_contents = TRY(ByteBuffer::create_zeroed(fs().block_size()));
- auto* block_as_pointers = (unsigned*)block_contents.data();
- FixedMemoryStream stream { block_contents.bytes() };
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(block_contents.data());
- if (old_blocks_length > 0) {
- TRY(fs().read_block(block, &buffer, fs().block_size()));
- }
- // Grow the triply indirect block.
- for (unsigned i = 0; i < old_doubly_indirect_blocks_length; i++)
- MUST(stream.write_value<u32>(block_as_pointers[i]));
- for (unsigned i = old_doubly_indirect_blocks_length; i < new_doubly_indirect_blocks_length; i++) {
- auto new_block = new_meta_blocks.take_last().value();
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::grow_triply_indirect_block(): Allocating doubly indirect block {} at index {}", identifier(), new_block, i);
- MUST(stream.write_value<u32>(new_block));
- meta_blocks++;
- }
- // Write out the doubly indirect blocks.
- for (unsigned i = old_blocks_length / entries_per_doubly_indirect_block; i < new_doubly_indirect_blocks_length; i++) {
- auto const processed_blocks = i * entries_per_doubly_indirect_block;
- auto const old_doubly_indirect_blocks_length = min(old_blocks_length > processed_blocks ? old_blocks_length - processed_blocks : 0, entries_per_doubly_indirect_block);
- auto const new_doubly_indirect_blocks_length = min(blocks_indices.size() > processed_blocks ? blocks_indices.size() - processed_blocks : 0, entries_per_doubly_indirect_block);
- TRY(grow_doubly_indirect_block(block_as_pointers[i], old_doubly_indirect_blocks_length, blocks_indices.slice(processed_blocks, new_doubly_indirect_blocks_length), new_meta_blocks, meta_blocks));
- }
- // Write out the triply indirect block.
- return fs().write_block(block, buffer, block_contents.size());
- }
- ErrorOr<void> Ext2FSInode::shrink_triply_indirect_block(BlockBasedFileSystem::BlockIndex block, size_t old_blocks_length, size_t new_blocks_length, unsigned& meta_blocks)
- {
- auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- auto const entries_per_doubly_indirect_block = entries_per_block * entries_per_block;
- auto const entries_per_triply_indirect_block = entries_per_doubly_indirect_block * entries_per_block;
- auto const old_triply_indirect_blocks_length = ceil_div(old_blocks_length, entries_per_doubly_indirect_block);
- auto const new_triply_indirect_blocks_length = new_blocks_length / entries_per_doubly_indirect_block;
- VERIFY(old_blocks_length > 0);
- VERIFY(old_blocks_length >= new_blocks_length);
- VERIFY(new_blocks_length <= entries_per_triply_indirect_block);
- auto block_contents = TRY(ByteBuffer::create_uninitialized(fs().block_size()));
- auto* block_as_pointers = (unsigned*)block_contents.data();
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(block_as_pointers));
- TRY(fs().read_block(block, &buffer, fs().block_size()));
- // Shrink the doubly indirect blocks.
- for (unsigned i = new_triply_indirect_blocks_length; i < old_triply_indirect_blocks_length; i++) {
- auto const processed_blocks = i * entries_per_doubly_indirect_block;
- auto const old_doubly_indirect_blocks_length = min(old_blocks_length > processed_blocks ? old_blocks_length - processed_blocks : 0, entries_per_doubly_indirect_block);
- auto const new_doubly_indirect_blocks_length = min(new_blocks_length > processed_blocks ? new_blocks_length - processed_blocks : 0, entries_per_doubly_indirect_block);
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::shrink_triply_indirect_block(): Shrinking doubly indirect block {} at index {}", identifier(), block_as_pointers[i], i);
- TRY(shrink_doubly_indirect_block(block_as_pointers[i], old_doubly_indirect_blocks_length, new_doubly_indirect_blocks_length, meta_blocks));
- }
- // Free the triply indirect block if no longer needed.
- if (new_blocks_length == 0) {
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::shrink_triply_indirect_block(): Freeing triply indirect block {}", identifier(), block);
- TRY(fs().set_block_allocation_state(block, false));
- meta_blocks--;
- }
- return {};
- }
- ErrorOr<void> Ext2FSInode::flush_block_list()
- {
- MutexLocker locker(m_inode_lock);
- if (m_block_list.is_empty()) {
- m_raw_inode.i_blocks = 0;
- memset(m_raw_inode.i_block, 0, sizeof(m_raw_inode.i_block));
- set_metadata_dirty(true);
- return {};
- }
- // NOTE: There is a mismatch between i_blocks and blocks.size() since i_blocks includes meta blocks and blocks.size() does not.
- auto const old_block_count = ceil_div(size(), static_cast<u64>(fs().block_size()));
- auto old_shape = fs().compute_block_list_shape(old_block_count);
- auto const new_shape = fs().compute_block_list_shape(m_block_list.size());
- Vector<Ext2FS::BlockIndex> new_meta_blocks;
- if (new_shape.meta_blocks > old_shape.meta_blocks) {
- new_meta_blocks = TRY(fs().allocate_blocks(fs().group_index_from_inode(index()), new_shape.meta_blocks - old_shape.meta_blocks));
- }
- m_raw_inode.i_blocks = (m_block_list.size() + new_shape.meta_blocks) * (fs().block_size() / 512);
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): Old shape=({};{};{};{}:{}), new shape=({};{};{};{}:{})", identifier(), old_shape.direct_blocks, old_shape.indirect_blocks, old_shape.doubly_indirect_blocks, old_shape.triply_indirect_blocks, old_shape.meta_blocks, new_shape.direct_blocks, new_shape.indirect_blocks, new_shape.doubly_indirect_blocks, new_shape.triply_indirect_blocks, new_shape.meta_blocks);
- unsigned output_block_index = 0;
- unsigned remaining_blocks = m_block_list.size();
- // Deal with direct blocks.
- bool inode_dirty = false;
- VERIFY(new_shape.direct_blocks <= EXT2_NDIR_BLOCKS);
- for (unsigned i = 0; i < new_shape.direct_blocks; ++i) {
- if (BlockBasedFileSystem::BlockIndex(m_raw_inode.i_block[i]) != m_block_list[output_block_index])
- inode_dirty = true;
- m_raw_inode.i_block[i] = m_block_list[output_block_index].value();
- ++output_block_index;
- --remaining_blocks;
- }
- // e2fsck considers all blocks reachable through any of the pointers in
- // m_raw_inode.i_block as part of this inode regardless of the value in
- // m_raw_inode.i_size. When it finds more blocks than the amount that
- // is indicated by i_size or i_blocks it offers to repair the filesystem
- // by changing those values. That will actually cause further corruption.
- // So we must zero all pointers to blocks that are now unused.
- for (unsigned i = new_shape.direct_blocks; i < EXT2_NDIR_BLOCKS; ++i) {
- m_raw_inode.i_block[i] = 0;
- }
- if (inode_dirty) {
- if constexpr (EXT2_DEBUG) {
- dbgln("Ext2FSInode[{}]::flush_block_list(): Writing {} direct block(s) to i_block array of inode {}", identifier(), min((size_t)EXT2_NDIR_BLOCKS, m_block_list.size()), index());
- for (size_t i = 0; i < min((size_t)EXT2_NDIR_BLOCKS, m_block_list.size()); ++i)
- dbgln(" + {}", m_block_list[i]);
- }
- set_metadata_dirty(true);
- }
- // Deal with indirect blocks.
- if (old_shape.indirect_blocks != new_shape.indirect_blocks) {
- if (new_shape.indirect_blocks > old_shape.indirect_blocks) {
- // Write out the indirect block.
- if (old_shape.indirect_blocks == 0) {
- auto new_block = new_meta_blocks.take_last().value();
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): Allocating indirect block: {}", identifier(), new_block);
- m_raw_inode.i_block[EXT2_IND_BLOCK] = new_block;
- set_metadata_dirty(true);
- old_shape.meta_blocks++;
- }
- TRY(write_indirect_block(m_raw_inode.i_block[EXT2_IND_BLOCK], m_block_list.span().slice(output_block_index, new_shape.indirect_blocks)));
- } else if ((new_shape.indirect_blocks == 0) && (old_shape.indirect_blocks != 0)) {
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): Freeing indirect block: {}", identifier(), m_raw_inode.i_block[EXT2_IND_BLOCK]);
- TRY(fs().set_block_allocation_state(m_raw_inode.i_block[EXT2_IND_BLOCK], false));
- old_shape.meta_blocks--;
- m_raw_inode.i_block[EXT2_IND_BLOCK] = 0;
- }
- }
- remaining_blocks -= new_shape.indirect_blocks;
- output_block_index += new_shape.indirect_blocks;
- if (old_shape.doubly_indirect_blocks != new_shape.doubly_indirect_blocks) {
- // Write out the doubly indirect block.
- if (new_shape.doubly_indirect_blocks > old_shape.doubly_indirect_blocks) {
- if (old_shape.doubly_indirect_blocks == 0) {
- auto new_block = new_meta_blocks.take_last().value();
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): Allocating doubly indirect block: {}", identifier(), new_block);
- m_raw_inode.i_block[EXT2_DIND_BLOCK] = new_block;
- set_metadata_dirty(true);
- old_shape.meta_blocks++;
- }
- TRY(grow_doubly_indirect_block(m_raw_inode.i_block[EXT2_DIND_BLOCK], old_shape.doubly_indirect_blocks, m_block_list.span().slice(output_block_index, new_shape.doubly_indirect_blocks), new_meta_blocks, old_shape.meta_blocks));
- } else {
- TRY(shrink_doubly_indirect_block(m_raw_inode.i_block[EXT2_DIND_BLOCK], old_shape.doubly_indirect_blocks, new_shape.doubly_indirect_blocks, old_shape.meta_blocks));
- if (new_shape.doubly_indirect_blocks == 0)
- m_raw_inode.i_block[EXT2_DIND_BLOCK] = 0;
- }
- }
- remaining_blocks -= new_shape.doubly_indirect_blocks;
- output_block_index += new_shape.doubly_indirect_blocks;
- if (old_shape.triply_indirect_blocks != new_shape.triply_indirect_blocks) {
- // Write out the triply indirect block.
- if (new_shape.triply_indirect_blocks > old_shape.triply_indirect_blocks) {
- if (old_shape.triply_indirect_blocks == 0) {
- auto new_block = new_meta_blocks.take_last().value();
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): Allocating triply indirect block: {}", identifier(), new_block);
- m_raw_inode.i_block[EXT2_TIND_BLOCK] = new_block;
- set_metadata_dirty(true);
- old_shape.meta_blocks++;
- }
- TRY(grow_triply_indirect_block(m_raw_inode.i_block[EXT2_TIND_BLOCK], old_shape.triply_indirect_blocks, m_block_list.span().slice(output_block_index, new_shape.triply_indirect_blocks), new_meta_blocks, old_shape.meta_blocks));
- } else {
- TRY(shrink_triply_indirect_block(m_raw_inode.i_block[EXT2_TIND_BLOCK], old_shape.triply_indirect_blocks, new_shape.triply_indirect_blocks, old_shape.meta_blocks));
- if (new_shape.triply_indirect_blocks == 0)
- m_raw_inode.i_block[EXT2_TIND_BLOCK] = 0;
- }
- }
- remaining_blocks -= new_shape.triply_indirect_blocks;
- output_block_index += new_shape.triply_indirect_blocks;
- dbgln_if(EXT2_BLOCKLIST_DEBUG, "Ext2FSInode[{}]::flush_block_list(): New meta blocks count at {}, expecting {}", identifier(), old_shape.meta_blocks, new_shape.meta_blocks);
- VERIFY(new_meta_blocks.size() == 0);
- VERIFY(old_shape.meta_blocks == new_shape.meta_blocks);
- if (!remaining_blocks)
- return {};
- dbgln("we don't know how to write qind ext2fs blocks, they don't exist anyway!");
- VERIFY_NOT_REACHED();
- }
- ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list() const
- {
- return compute_block_list_impl(false);
- }
- ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list_with_meta_blocks() const
- {
- return compute_block_list_impl(true);
- }
- ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list_impl(bool include_block_list_blocks) const
- {
- // FIXME: This is really awkwardly factored.. foo_impl_internal :|
- auto block_list = TRY(compute_block_list_impl_internal(m_raw_inode, include_block_list_blocks));
- while (!block_list.is_empty() && block_list.last() == 0)
- block_list.take_last();
- return block_list;
- }
- ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list_impl_internal(ext2_inode const& e2inode, bool include_block_list_blocks) const
- {
- unsigned entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
- unsigned block_count = ceil_div(size(), static_cast<u64>(fs().block_size()));
- // If we are handling a symbolic link, the path is stored in the 60 bytes in
- // the inode that are used for the 12 direct and 3 indirect block pointers,
- // If the path is longer than 60 characters, a block is allocated, and the
- // block contains the destination path. The file size corresponds to the
- // path length of the destination.
- if (Kernel::is_symlink(e2inode.i_mode) && e2inode.i_blocks == 0)
- block_count = 0;
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::block_list_for_inode(): i_size={}, i_blocks={}, block_count={}", identifier(), e2inode.i_size, e2inode.i_blocks, block_count);
- unsigned blocks_remaining = block_count;
- if (include_block_list_blocks) {
- auto shape = fs().compute_block_list_shape(block_count);
- blocks_remaining += shape.meta_blocks;
- }
- Vector<Ext2FS::BlockIndex> list;
- auto add_block = [&](auto bi) -> ErrorOr<void> {
- if (blocks_remaining) {
- TRY(list.try_append(bi));
- --blocks_remaining;
- }
- return {};
- };
- if (include_block_list_blocks) {
- // This seems like an excessive over-estimate but w/e.
- TRY(list.try_ensure_capacity(blocks_remaining * 2));
- } else {
- TRY(list.try_ensure_capacity(blocks_remaining));
- }
- unsigned direct_count = min(block_count, (unsigned)EXT2_NDIR_BLOCKS);
- for (unsigned i = 0; i < direct_count; ++i) {
- auto block_index = e2inode.i_block[i];
- TRY(add_block(block_index));
- }
- if (!blocks_remaining)
- return list;
- // Don't need to make copy of add_block, since this capture will only
- // be called before compute_block_list_impl_internal finishes.
- auto process_block_array = [&](auto array_block_index, auto&& callback) -> ErrorOr<void> {
- if (include_block_list_blocks)
- TRY(add_block(array_block_index));
- auto count = min(blocks_remaining, entries_per_block);
- if (!count)
- return {};
- size_t read_size = count * sizeof(u32);
- auto array_storage = TRY(ByteBuffer::create_uninitialized(read_size));
- auto* array = (u32*)array_storage.data();
- auto buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)array);
- TRY(fs().read_block(array_block_index, &buffer, read_size, 0));
- for (unsigned i = 0; i < count; ++i)
- TRY(callback(Ext2FS::BlockIndex(array[i])));
- return {};
- };
- TRY(process_block_array(e2inode.i_block[EXT2_IND_BLOCK], [&](auto block_index) -> ErrorOr<void> {
- return add_block(block_index);
- }));
- if (!blocks_remaining)
- return list;
- TRY(process_block_array(e2inode.i_block[EXT2_DIND_BLOCK], [&](auto block_index) -> ErrorOr<void> {
- return process_block_array(block_index, [&](auto block_index2) -> ErrorOr<void> {
- return add_block(block_index2);
- });
- }));
- if (!blocks_remaining)
- return list;
- TRY(process_block_array(e2inode.i_block[EXT2_TIND_BLOCK], [&](auto block_index) -> ErrorOr<void> {
- return process_block_array(block_index, [&](auto block_index2) -> ErrorOr<void> {
- return process_block_array(block_index2, [&](auto block_index3) -> ErrorOr<void> {
- return add_block(block_index3);
- });
- });
- }));
- return list;
- }
- Ext2FSInode::Ext2FSInode(Ext2FS& fs, InodeIndex index)
- : Inode(fs, index)
- {
- }
- Ext2FSInode::~Ext2FSInode()
- {
- if (m_raw_inode.i_links_count == 0) {
- // Alas, we have nowhere to propagate any errors that occur here.
- (void)fs().free_inode(*this);
- }
- }
- u64 Ext2FSInode::size() const
- {
- if (Kernel::is_regular_file(m_raw_inode.i_mode) && ((u32)fs().get_features_readonly() & (u32)Ext2FS::FeaturesReadOnly::FileSize64bits))
- return static_cast<u64>(m_raw_inode.i_dir_acl) << 32 | m_raw_inode.i_size;
- return m_raw_inode.i_size;
- }
- InodeMetadata Ext2FSInode::metadata() const
- {
- MutexLocker locker(m_inode_lock);
- InodeMetadata metadata;
- metadata.inode = identifier();
- metadata.size = size();
- metadata.mode = m_raw_inode.i_mode;
- metadata.uid = m_raw_inode.i_uid;
- metadata.gid = m_raw_inode.i_gid;
- metadata.link_count = m_raw_inode.i_links_count;
- metadata.atime = UnixDateTime::from_seconds_since_epoch(m_raw_inode.i_atime);
- metadata.ctime = UnixDateTime::from_seconds_since_epoch(m_raw_inode.i_ctime);
- metadata.mtime = UnixDateTime::from_seconds_since_epoch(m_raw_inode.i_mtime);
- metadata.dtime = UnixDateTime::from_seconds_since_epoch(m_raw_inode.i_dtime);
- metadata.block_size = fs().block_size();
- metadata.block_count = m_raw_inode.i_blocks;
- if (Kernel::is_character_device(m_raw_inode.i_mode) || Kernel::is_block_device(m_raw_inode.i_mode)) {
- unsigned dev = m_raw_inode.i_block[0];
- if (!dev)
- dev = m_raw_inode.i_block[1];
- metadata.major_device = (dev & 0xfff00) >> 8;
- metadata.minor_device = (dev & 0xff) | ((dev >> 12) & 0xfff00);
- }
- return metadata;
- }
- ErrorOr<void> Ext2FSInode::flush_metadata()
- {
- MutexLocker locker(m_inode_lock);
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::flush_metadata(): Flushing inode", identifier());
- TRY(fs().write_ext2_inode(index(), m_raw_inode));
- if (is_directory()) {
- // Unless we're about to go away permanently, invalidate the lookup cache.
- if (m_raw_inode.i_links_count != 0) {
- // FIXME: This invalidation is way too hardcore. It's sad to throw away the whole cache.
- m_lookup_cache.clear();
- }
- }
- set_metadata_dirty(false);
- return {};
- }
- ErrorOr<void> Ext2FSInode::compute_block_list_with_exclusive_locking()
- {
- // Note: We verify that the inode mutex is being held locked. Because only the read_bytes_locked()
- // method uses this method and the mutex can be locked in shared mode when reading the Inode if
- // it is an ext2 regular file, but also in exclusive mode, when the Inode is an ext2 directory and being
- // traversed, we use another exclusive lock to ensure we always mutate the block list safely.
- VERIFY(m_inode_lock.is_locked());
- MutexLocker block_list_locker(m_block_list_lock);
- if (m_block_list.is_empty())
- m_block_list = TRY(compute_block_list());
- return {};
- }
- ErrorOr<size_t> Ext2FSInode::read_bytes_locked(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription* description) const
- {
- VERIFY(m_inode_lock.is_locked());
- VERIFY(offset >= 0);
- if (m_raw_inode.i_size == 0)
- return 0;
- if (static_cast<u64>(offset) >= size())
- return 0;
- // Symbolic links shorter than 60 characters are store inline inside the i_block array.
- // This avoids wasting an entire block on short links. (Most links are short.)
- if (is_symlink() && size() < max_inline_symlink_length) {
- VERIFY(offset == 0);
- size_t nread = min((off_t)size() - offset, static_cast<off_t>(count));
- TRY(buffer.write(((u8 const*)m_raw_inode.i_block) + offset, nread));
- return nread;
- }
- // Note: We bypass the const declaration of this method, but this is a strong
- // requirement to be able to accomplish the read operation successfully.
- // We call this special method because it locks a separate mutex to ensure we
- // update the block list of the inode safely, as the m_inode_lock is locked in
- // shared mode.
- TRY(const_cast<Ext2FSInode&>(*this).compute_block_list_with_exclusive_locking());
- if (m_block_list.is_empty()) {
- dmesgln("Ext2FSInode[{}]::read_bytes(): Empty block list", identifier());
- return EIO;
- }
- bool allow_cache = !description || !description->is_direct();
- int const block_size = fs().block_size();
- BlockBasedFileSystem::BlockIndex first_block_logical_index = offset / block_size;
- BlockBasedFileSystem::BlockIndex last_block_logical_index = (offset + count) / block_size;
- if (last_block_logical_index >= m_block_list.size())
- last_block_logical_index = m_block_list.size() - 1;
- int offset_into_first_block = offset % block_size;
- size_t nread = 0;
- auto remaining_count = min((off_t)count, (off_t)size() - offset);
- dbgln_if(EXT2_VERY_DEBUG, "Ext2FSInode[{}]::read_bytes(): Reading up to {} bytes, {} bytes into inode to {}", identifier(), count, offset, buffer.user_or_kernel_ptr());
- for (auto bi = first_block_logical_index; remaining_count && bi <= last_block_logical_index; bi = bi.value() + 1) {
- auto block_index = m_block_list[bi.value()];
- size_t offset_into_block = (bi == first_block_logical_index) ? offset_into_first_block : 0;
- size_t num_bytes_to_copy = min((size_t)block_size - offset_into_block, (size_t)remaining_count);
- auto buffer_offset = buffer.offset(nread);
- if (block_index.value() == 0) {
- // This is a hole, act as if it's filled with zeroes.
- TRY(buffer_offset.memset(0, num_bytes_to_copy));
- } else {
- if (auto result = fs().read_block(block_index, &buffer_offset, num_bytes_to_copy, offset_into_block, allow_cache); result.is_error()) {
- dmesgln("Ext2FSInode[{}]::read_bytes(): Failed to read block {} (index {})", identifier(), block_index.value(), bi);
- return result.release_error();
- }
- }
- remaining_count -= num_bytes_to_copy;
- nread += num_bytes_to_copy;
- }
- return nread;
- }
- ErrorOr<void> Ext2FSInode::resize(u64 new_size)
- {
- auto old_size = size();
- if (old_size == new_size)
- return {};
- if (!((u32)fs().get_features_readonly() & (u32)Ext2FS::FeaturesReadOnly::FileSize64bits) && (new_size >= static_cast<u32>(-1)))
- return ENOSPC;
- u64 block_size = fs().block_size();
- auto blocks_needed_before = ceil_div(old_size, block_size);
- auto blocks_needed_after = ceil_div(new_size, block_size);
- if constexpr (EXT2_DEBUG) {
- dbgln("Ext2FSInode[{}]::resize(): Blocks needed before (size was {}): {}", identifier(), old_size, blocks_needed_before);
- dbgln("Ext2FSInode[{}]::resize(): Blocks needed after (size is {}): {}", identifier(), new_size, blocks_needed_after);
- }
- if (blocks_needed_after > blocks_needed_before) {
- auto additional_blocks_needed = blocks_needed_after - blocks_needed_before;
- if (additional_blocks_needed > fs().super_block().s_free_blocks_count)
- return ENOSPC;
- }
- if (m_block_list.is_empty())
- m_block_list = TRY(compute_block_list());
- if (blocks_needed_after > blocks_needed_before) {
- auto blocks = TRY(fs().allocate_blocks(fs().group_index_from_inode(index()), blocks_needed_after - blocks_needed_before));
- TRY(m_block_list.try_extend(move(blocks)));
- } else if (blocks_needed_after < blocks_needed_before) {
- if constexpr (EXT2_VERY_DEBUG) {
- dbgln("Ext2FSInode[{}]::resize(): Shrinking inode, old block list is {} entries:", identifier(), m_block_list.size());
- for (auto block_index : m_block_list) {
- dbgln(" # {}", block_index);
- }
- }
- while (m_block_list.size() != blocks_needed_after) {
- auto block_index = m_block_list.take_last();
- if (block_index.value()) {
- if (auto result = fs().set_block_allocation_state(block_index, false); result.is_error()) {
- dbgln("Ext2FSInode[{}]::resize(): Failed to free block {}: {}", identifier(), block_index, result.error());
- return result;
- }
- }
- }
- }
- TRY(flush_block_list());
- m_raw_inode.i_size = new_size;
- if (Kernel::is_regular_file(m_raw_inode.i_mode))
- m_raw_inode.i_dir_acl = new_size >> 32;
- set_metadata_dirty(true);
- if (new_size > old_size) {
- // If we're growing the inode, make sure we zero out all the new space.
- // FIXME: There are definitely more efficient ways to achieve this.
- auto bytes_to_clear = new_size - old_size;
- auto clear_from = old_size;
- u8 zero_buffer[PAGE_SIZE] {};
- while (bytes_to_clear) {
- auto nwritten = TRY(write_bytes(clear_from, min(static_cast<u64>(sizeof(zero_buffer)), bytes_to_clear), UserOrKernelBuffer::for_kernel_buffer(zero_buffer), nullptr));
- VERIFY(nwritten != 0);
- bytes_to_clear -= nwritten;
- clear_from += nwritten;
- }
- }
- return {};
- }
- ErrorOr<size_t> Ext2FSInode::write_bytes_locked(off_t offset, size_t count, UserOrKernelBuffer const& data, OpenFileDescription* description)
- {
- VERIFY(m_inode_lock.is_locked());
- VERIFY(offset >= 0);
- if (count == 0)
- return 0;
- if (is_symlink()) {
- VERIFY(offset == 0);
- if (max((size_t)(offset + count), (size_t)m_raw_inode.i_size) < max_inline_symlink_length) {
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::write_bytes_locked(): Poking into i_block array for inline symlink ({} bytes)", identifier(), count);
- TRY(data.read(((u8*)m_raw_inode.i_block) + offset, count));
- if ((size_t)(offset + count) > (size_t)m_raw_inode.i_size)
- m_raw_inode.i_size = offset + count;
- set_metadata_dirty(true);
- return count;
- }
- }
- bool allow_cache = !description || !description->is_direct();
- auto const block_size = fs().block_size();
- auto new_size = max(static_cast<u64>(offset) + count, size());
- TRY(resize(new_size));
- if (m_block_list.is_empty())
- m_block_list = TRY(compute_block_list());
- if (m_block_list.is_empty()) {
- dbgln("Ext2FSInode[{}]::write_bytes(): Empty block list", identifier());
- return EIO;
- }
- BlockBasedFileSystem::BlockIndex first_block_logical_index = offset / block_size;
- BlockBasedFileSystem::BlockIndex last_block_logical_index = (offset + count) / block_size;
- if (last_block_logical_index >= m_block_list.size())
- last_block_logical_index = m_block_list.size() - 1;
- size_t offset_into_first_block = offset % block_size;
- size_t nwritten = 0;
- auto remaining_count = min((off_t)count, (off_t)new_size - offset);
- dbgln_if(EXT2_VERY_DEBUG, "Ext2FSInode[{}]::write_bytes_locked(): Writing {} bytes, {} bytes into inode from {}", identifier(), count, offset, data.user_or_kernel_ptr());
- for (auto bi = first_block_logical_index; remaining_count && bi <= last_block_logical_index; bi = bi.value() + 1) {
- size_t offset_into_block = (bi == first_block_logical_index) ? offset_into_first_block : 0;
- size_t num_bytes_to_copy = min((size_t)block_size - offset_into_block, (size_t)remaining_count);
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::write_bytes_locked(): Writing block {} (offset_into_block: {})", identifier(), m_block_list[bi.value()], offset_into_block);
- if (auto result = fs().write_block(m_block_list[bi.value()], data.offset(nwritten), num_bytes_to_copy, offset_into_block, allow_cache); result.is_error()) {
- dbgln("Ext2FSInode[{}]::write_bytes_locked(): Failed to write block {} (index {})", identifier(), m_block_list[bi.value()], bi);
- return result.release_error();
- }
- remaining_count -= num_bytes_to_copy;
- nwritten += num_bytes_to_copy;
- }
- did_modify_contents();
- dbgln_if(EXT2_VERY_DEBUG, "Ext2FSInode[{}]::write_bytes_locked(): After write, i_size={}, i_blocks={} ({} blocks in list)", identifier(), size(), m_raw_inode.i_blocks, m_block_list.size());
- return nwritten;
- }
- ErrorOr<void> Ext2FSInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
- {
- VERIFY(is_directory());
- u8 buffer[max_block_size];
- auto buf = UserOrKernelBuffer::for_kernel_buffer(buffer);
- auto block_size = fs().block_size();
- auto file_size = size();
- // Directory entries are guaranteed not to span multiple blocks,
- // so we can iterate over blocks separately.
- for (u64 offset = 0; offset < file_size; offset += block_size) {
- TRY(read_bytes(offset, block_size, buf, nullptr));
- using ext2_extended_dir_entry = ext2_dir_entry_2;
- auto* entry = reinterpret_cast<ext2_extended_dir_entry*>(buffer);
- auto* entries_end = reinterpret_cast<ext2_extended_dir_entry*>(buffer + block_size);
- while (entry < entries_end) {
- if (entry->inode != 0) {
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::traverse_as_directory(): inode {}, name_len: {}, rec_len: {}, file_type: {}, name: {}", identifier(), entry->inode, entry->name_len, entry->rec_len, entry->file_type, StringView(entry->name, entry->name_len));
- TRY(callback({ { entry->name, entry->name_len }, { fsid(), entry->inode }, entry->file_type }));
- }
- entry = (ext2_extended_dir_entry*)((char*)entry + entry->rec_len);
- }
- }
- return {};
- }
- ErrorOr<void> Ext2FSInode::write_directory(Vector<Ext2FSDirectoryEntry>& entries)
- {
- MutexLocker locker(m_inode_lock);
- auto block_size = fs().block_size();
- // Calculate directory size and record length of entries so that
- // the following constraints are met:
- // - All used blocks must be entirely filled.
- // - Entries are aligned on a 4-byte boundary.
- // - No entry may span multiple blocks.
- size_t directory_size = 0;
- size_t space_in_block = block_size;
- for (size_t i = 0; i < entries.size(); ++i) {
- auto& entry = entries[i];
- entry.record_length = EXT2_DIR_REC_LEN(entry.name->length());
- space_in_block -= entry.record_length;
- if (i + 1 < entries.size()) {
- if (EXT2_DIR_REC_LEN(entries[i + 1].name->length()) > space_in_block) {
- entry.record_length += space_in_block;
- space_in_block = block_size;
- }
- } else {
- entry.record_length += space_in_block;
- }
- directory_size += entry.record_length;
- }
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::write_directory(): New directory contents to write (size {}):", identifier(), directory_size);
- auto directory_data = TRY(ByteBuffer::create_uninitialized(directory_size));
- FixedMemoryStream stream { directory_data.bytes() };
- for (auto& entry : entries) {
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::write_directory(): Writing inode: {}, name_len: {}, rec_len: {}, file_type: {}, name: {}", identifier(), entry.inode_index, u16(entry.name->length()), u16(entry.record_length), u8(entry.file_type), entry.name);
- MUST(stream.write_value<u32>(entry.inode_index.value()));
- MUST(stream.write_value<u16>(entry.record_length));
- MUST(stream.write_value<u8>(entry.name->length()));
- MUST(stream.write_value<u8>(entry.file_type));
- MUST(stream.write_until_depleted(entry.name->bytes()));
- int padding = entry.record_length - entry.name->length() - 8;
- for (int j = 0; j < padding; ++j)
- MUST(stream.write_value<u8>(0));
- }
- auto serialized_bytes_count = TRY(stream.tell());
- VERIFY(serialized_bytes_count == directory_size);
- TRY(resize(serialized_bytes_count));
- auto buffer = UserOrKernelBuffer::for_kernel_buffer(directory_data.data());
- auto nwritten = TRY(write_bytes(0, serialized_bytes_count, buffer, nullptr));
- set_metadata_dirty(true);
- if (nwritten != directory_data.size())
- return EIO;
- return {};
- }
- ErrorOr<NonnullRefPtr<Inode>> Ext2FSInode::create_child(StringView name, mode_t mode, dev_t dev, UserID uid, GroupID gid)
- {
- if (Kernel::is_directory(mode))
- return fs().create_directory(*this, name, mode, uid, gid);
- return fs().create_inode(*this, name, mode, dev, uid, gid);
- }
- ErrorOr<void> Ext2FSInode::add_child(Inode& child, StringView name, mode_t mode)
- {
- MutexLocker locker(m_inode_lock);
- VERIFY(is_directory());
- if (name.length() > EXT2_NAME_LEN)
- return ENAMETOOLONG;
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::add_child(): Adding inode {} with name '{}' and mode {:o} to directory {}", identifier(), child.index(), name, mode, index());
- Vector<Ext2FSDirectoryEntry> entries;
- TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
- if (name == entry.name)
- return EEXIST;
- auto entry_name = TRY(KString::try_create(entry.name));
- TRY(entries.try_append({ move(entry_name), entry.inode.index(), entry.file_type }));
- return {};
- }));
- TRY(child.increment_link_count());
- auto entry_name = TRY(KString::try_create(name));
- TRY(entries.try_empend(move(entry_name), child.index(), to_ext2_file_type(mode)));
- TRY(write_directory(entries));
- TRY(populate_lookup_cache());
- auto cache_entry_name = TRY(KString::try_create(name));
- TRY(m_lookup_cache.try_set(move(cache_entry_name), child.index()));
- did_add_child(child.identifier(), name);
- return {};
- }
- ErrorOr<void> Ext2FSInode::remove_child(StringView name)
- {
- MutexLocker locker(m_inode_lock);
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::remove_child(): Removing '{}'", identifier(), name);
- VERIFY(is_directory());
- TRY(populate_lookup_cache());
- auto it = m_lookup_cache.find(name);
- if (it == m_lookup_cache.end())
- return ENOENT;
- auto child_inode_index = (*it).value;
- InodeIdentifier child_id { fsid(), child_inode_index };
- Vector<Ext2FSDirectoryEntry> entries;
- TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
- if (name != entry.name) {
- auto entry_name = TRY(KString::try_create(entry.name));
- TRY(entries.try_append({ move(entry_name), entry.inode.index(), entry.file_type }));
- }
- return {};
- }));
- TRY(write_directory(entries));
- m_lookup_cache.remove(it);
- auto child_inode = TRY(fs().get_inode(child_id));
- TRY(child_inode->decrement_link_count());
- did_remove_child(child_id, name);
- return {};
- }
- ErrorOr<void> Ext2FSInode::replace_child(StringView name, Inode& child)
- {
- MutexLocker locker(m_inode_lock);
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::replace_child(): Replacing '{}' with inode {}", identifier(), name, child.index());
- VERIFY(is_directory());
- TRY(populate_lookup_cache());
- if (name.length() > EXT2_NAME_LEN)
- return ENAMETOOLONG;
- Vector<Ext2FSDirectoryEntry> entries;
- Optional<InodeIndex> old_child_index;
- TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
- auto is_replacing_this_inode = name == entry.name;
- auto inode_index = is_replacing_this_inode ? child.index() : entry.inode.index();
- auto entry_name = TRY(KString::try_create(entry.name));
- TRY(entries.try_empend(move(entry_name), inode_index, to_ext2_file_type(child.mode())));
- if (is_replacing_this_inode)
- old_child_index = entry.inode.index();
- return {};
- }));
- if (!old_child_index.has_value())
- return ENOENT;
- auto old_child = TRY(fs().get_inode({ fsid(), *old_child_index }));
- auto old_index_it = m_lookup_cache.find(name);
- VERIFY(old_index_it != m_lookup_cache.end());
- old_index_it->value = child.index();
- // NOTE: Between this line and the write_directory line, all operations must
- // be atomic. Any changes made should be reverted.
- TRY(child.increment_link_count());
- auto maybe_decrement_error = old_child->decrement_link_count();
- if (maybe_decrement_error.is_error()) {
- old_index_it->value = *old_child_index;
- MUST(child.decrement_link_count());
- return maybe_decrement_error;
- }
- // FIXME: The filesystem is left in an inconsistent state if this fails.
- // Revert the changes made above if we can't write_directory.
- // Ideally, decrement should be the last operation, but we currently
- // can't "un-write" a directory entry list.
- TRY(write_directory(entries));
- // TODO: Emit a did_replace_child event.
- return {};
- }
- ErrorOr<void> Ext2FSInode::populate_lookup_cache()
- {
- VERIFY(m_inode_lock.is_exclusively_locked_by_current_thread());
- if (!m_lookup_cache.is_empty())
- return {};
- HashMap<NonnullOwnPtr<KString>, InodeIndex> children;
- TRY(traverse_as_directory([&children](auto& entry) -> ErrorOr<void> {
- auto entry_name = TRY(KString::try_create(entry.name));
- TRY(children.try_set(move(entry_name), entry.inode.index()));
- return {};
- }));
- VERIFY(m_lookup_cache.is_empty());
- m_lookup_cache = move(children);
- return {};
- }
- ErrorOr<NonnullRefPtr<Inode>> Ext2FSInode::lookup(StringView name)
- {
- VERIFY(is_directory());
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]:lookup(): Looking up '{}'", identifier(), name);
- InodeIndex inode_index;
- {
- MutexLocker locker(m_inode_lock);
- TRY(populate_lookup_cache());
- auto it = m_lookup_cache.find(name);
- if (it == m_lookup_cache.end()) {
- dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]:lookup(): '{}' not found", identifier(), name);
- return ENOENT;
- }
- inode_index = it->value;
- }
- return fs().get_inode({ fsid(), inode_index });
- }
- ErrorOr<void> Ext2FSInode::update_timestamps(Optional<UnixDateTime> atime, Optional<UnixDateTime> ctime, Optional<UnixDateTime> mtime)
- {
- MutexLocker locker(m_inode_lock);
- if (fs().is_readonly())
- return EROFS;
- if (atime.value_or({}).to_timespec().tv_sec > NumericLimits<i32>::max())
- return EINVAL;
- if (ctime.value_or({}).to_timespec().tv_sec > NumericLimits<i32>::max())
- return EINVAL;
- if (mtime.value_or({}).to_timespec().tv_sec > NumericLimits<i32>::max())
- return EINVAL;
- if (atime.has_value())
- m_raw_inode.i_atime = atime.value().to_timespec().tv_sec;
- if (ctime.has_value())
- m_raw_inode.i_ctime = ctime.value().to_timespec().tv_sec;
- if (mtime.has_value())
- m_raw_inode.i_mtime = mtime.value().to_timespec().tv_sec;
- set_metadata_dirty(true);
- return {};
- }
- ErrorOr<void> Ext2FSInode::increment_link_count()
- {
- MutexLocker locker(m_inode_lock);
- if (fs().is_readonly())
- return EROFS;
- constexpr size_t max_link_count = 65535;
- if (m_raw_inode.i_links_count == max_link_count)
- return EMLINK;
- ++m_raw_inode.i_links_count;
- set_metadata_dirty(true);
- return {};
- }
- ErrorOr<void> Ext2FSInode::decrement_link_count()
- {
- MutexLocker locker(m_inode_lock);
- if (fs().is_readonly())
- return EROFS;
- VERIFY(m_raw_inode.i_links_count);
- --m_raw_inode.i_links_count;
- set_metadata_dirty(true);
- if (m_raw_inode.i_links_count == 0)
- did_delete_self();
- if (ref_count() == 1 && m_raw_inode.i_links_count == 0)
- fs().uncache_inode(index());
- return {};
- }
- ErrorOr<void> Ext2FSInode::chmod(mode_t mode)
- {
- MutexLocker locker(m_inode_lock);
- if (m_raw_inode.i_mode == mode)
- return {};
- m_raw_inode.i_mode = mode;
- set_metadata_dirty(true);
- return {};
- }
- ErrorOr<void> Ext2FSInode::chown(UserID uid, GroupID gid)
- {
- MutexLocker locker(m_inode_lock);
- if (m_raw_inode.i_uid == uid && m_raw_inode.i_gid == gid)
- return {};
- m_raw_inode.i_uid = uid.value();
- m_raw_inode.i_gid = gid.value();
- set_metadata_dirty(true);
- return {};
- }
- ErrorOr<void> Ext2FSInode::truncate(u64 size)
- {
- MutexLocker locker(m_inode_lock);
- if (static_cast<u64>(m_raw_inode.i_size) == size)
- return {};
- TRY(resize(size));
- set_metadata_dirty(true);
- return {};
- }
- ErrorOr<int> Ext2FSInode::get_block_address(int index)
- {
- MutexLocker locker(m_inode_lock);
- if (m_block_list.is_empty())
- m_block_list = TRY(compute_block_list());
- if (index < 0 || (size_t)index >= m_block_list.size())
- return 0;
- return m_block_list[index].value();
- }
- }
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