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https://github.com/RGBCube/serenity
synced 2025-05-28 22:15:07 +00:00
Ext2FS: Tidy up code related to the Ext2 super block a bit
Store the cached super block as an ext2_super_block member instead of caching it in a ByteBuffer and using a casting helper everywhere. This patch also combines reading/writing of the super block into a single disk device operation (instead of two.)
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parent
e4b7786b66
commit
3a8b5b405c
2 changed files with 15 additions and 39 deletions
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@ -46,28 +46,11 @@ Ext2FS::~Ext2FS()
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{
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{
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}
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}
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ByteBuffer Ext2FS::read_super_block() const
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bool Ext2FS::flush_super_block()
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{
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{
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LOCKER(m_lock);
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LOCKER(m_lock);
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auto buffer = ByteBuffer::create_uninitialized(1024);
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bool success = device().write_blocks(2, 1, (const u8*)&m_super_block);
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bool success = device().read_block(2, buffer.data());
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ASSERT(success);
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ASSERT(success);
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success = device().read_block(3, buffer.offset_pointer(512));
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ASSERT(success);
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return buffer;
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}
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bool Ext2FS::write_super_block(const ext2_super_block& sb)
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{
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LOCKER(m_lock);
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const u8* raw = (const u8*)&sb;
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bool success;
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success = device().write_block(2, raw);
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ASSERT(success);
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success = device().write_block(3, raw + 512);
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ASSERT(success);
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// FIXME: This is an ugly way to refresh the superblock cache. :-|
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super_block();
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return true;
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return true;
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}
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}
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@ -76,13 +59,6 @@ unsigned Ext2FS::first_block_of_group(GroupIndex group_index) const
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return super_block().s_first_data_block + (group_index * super_block().s_blocks_per_group);
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return super_block().s_first_data_block + (group_index * super_block().s_blocks_per_group);
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}
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}
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const ext2_super_block& Ext2FS::super_block() const
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{
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if (!m_cached_super_block)
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m_cached_super_block = read_super_block();
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return *reinterpret_cast<ext2_super_block*>(m_cached_super_block.data());
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}
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const ext2_group_desc& Ext2FS::group_descriptor(GroupIndex group_index) const
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const ext2_group_desc& Ext2FS::group_descriptor(GroupIndex group_index) const
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{
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{
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// FIXME: Should this fail gracefully somehow?
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// FIXME: Should this fail gracefully somehow?
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@ -104,6 +80,9 @@ const ext2_group_desc& Ext2FS::group_descriptor(GroupIndex group_index) const
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bool Ext2FS::initialize()
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bool Ext2FS::initialize()
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{
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{
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bool success = const_cast<DiskDevice&>(device()).read_blocks(2, 1, (u8*)&m_super_block);
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ASSERT(success);
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auto& super_block = this->super_block();
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auto& super_block = this->super_block();
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#ifdef EXT2_DEBUG
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#ifdef EXT2_DEBUG
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kprintf("ext2fs: super block magic: %x (super block size: %u)\n", super_block.s_magic, sizeof(ext2_super_block));
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kprintf("ext2fs: super block magic: %x (super block size: %u)\n", super_block.s_magic, sizeof(ext2_super_block));
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@ -516,7 +495,7 @@ void Ext2FS::flush_block_group_descriptor_table()
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void Ext2FS::flush_writes()
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void Ext2FS::flush_writes()
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{
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{
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if (m_super_block_dirty) {
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if (m_super_block_dirty) {
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write_super_block(super_block());
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flush_super_block();
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m_super_block_dirty = false;
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m_super_block_dirty = false;
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}
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}
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if (m_block_group_descriptors_dirty) {
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if (m_block_group_descriptors_dirty) {
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@ -1193,14 +1172,13 @@ bool Ext2FS::set_inode_allocation_state(InodeIndex inode_index, bool new_state)
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ASSERT(success);
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ASSERT(success);
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// Update superblock
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// Update superblock
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auto& sb = *reinterpret_cast<ext2_super_block*>(m_cached_super_block.data());
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#ifdef EXT2_DEBUG
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#ifdef EXT2_DEBUG
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dbgprintf("Ext2FS: superblock free inode count %u -> %u\n", sb.s_free_inodes_count, sb.s_free_inodes_count - 1);
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dbgprintf("Ext2FS: superblock free inode count %u -> %u\n", m_super_block.s_free_inodes_count, m_super_block.s_free_inodes_count - 1);
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#endif
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#endif
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if (new_state)
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if (new_state)
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--sb.s_free_inodes_count;
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--m_super_block.s_free_inodes_count;
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else
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else
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++sb.s_free_inodes_count;
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++m_super_block.s_free_inodes_count;
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m_super_block_dirty = true;
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m_super_block_dirty = true;
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// Update BGD
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// Update BGD
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@ -1257,14 +1235,13 @@ bool Ext2FS::set_block_allocation_state(BlockIndex block_index, bool new_state)
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ASSERT(success);
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ASSERT(success);
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// Update superblock
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// Update superblock
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auto& sb = *reinterpret_cast<ext2_super_block*>(m_cached_super_block.data());
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#ifdef EXT2_DEBUG
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#ifdef EXT2_DEBUG
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dbgprintf("Ext2FS: superblock free block count %u -> %u\n", sb.s_free_blocks_count, sb.s_free_blocks_count - 1);
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dbgprintf("Ext2FS: superblock free block count %u -> %u\n", m_super_block.s_free_blocks_count, m_super_block.s_free_blocks_count - 1);
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#endif
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#endif
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if (new_state)
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if (new_state)
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--sb.s_free_blocks_count;
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--m_super_block.s_free_blocks_count;
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else
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else
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++sb.s_free_blocks_count;
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++m_super_block.s_free_blocks_count;
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m_super_block_dirty = true;
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m_super_block_dirty = true;
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// Update BGD
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// Update BGD
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@ -78,7 +78,7 @@ private:
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typedef unsigned InodeIndex;
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typedef unsigned InodeIndex;
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explicit Ext2FS(NonnullRefPtr<DiskDevice>&&);
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explicit Ext2FS(NonnullRefPtr<DiskDevice>&&);
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const ext2_super_block& super_block() const;
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const ext2_super_block& super_block() const { return m_super_block; }
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const ext2_group_desc& group_descriptor(unsigned groupIndex) const;
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const ext2_group_desc& group_descriptor(unsigned groupIndex) const;
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void flush_block_group_descriptor_table();
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void flush_block_group_descriptor_table();
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unsigned first_block_of_group(unsigned groupIndex) const;
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unsigned first_block_of_group(unsigned groupIndex) const;
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@ -90,8 +90,7 @@ private:
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bool write_ext2_inode(InodeIndex, const ext2_inode&);
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bool write_ext2_inode(InodeIndex, const ext2_inode&);
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bool read_block_containing_inode(InodeIndex inode, BlockIndex& block_index, unsigned& offset, u8* buffer) const;
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bool read_block_containing_inode(InodeIndex inode, BlockIndex& block_index, unsigned& offset, u8* buffer) const;
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ByteBuffer read_super_block() const;
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bool flush_super_block();
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bool write_super_block(const ext2_super_block&);
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virtual const char* class_name() const override;
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virtual const char* class_name() const override;
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virtual InodeIdentifier root_inode() const override;
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virtual InodeIdentifier root_inode() const override;
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@ -129,7 +128,7 @@ private:
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unsigned m_block_group_count { 0 };
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unsigned m_block_group_count { 0 };
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mutable ByteBuffer m_cached_super_block;
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mutable ext2_super_block m_super_block;
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mutable ByteBuffer m_cached_group_descriptor_table;
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mutable ByteBuffer m_cached_group_descriptor_table;
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mutable HashMap<BlockIndex, RefPtr<Ext2FSInode>> m_inode_cache;
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mutable HashMap<BlockIndex, RefPtr<Ext2FSInode>> m_inode_cache;
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