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LibSQL: Keep track of free heap blocks when trimming storage

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When overwriting existing heap storage that requires fewer blocks, make
sure to free all remaining blocks so they can be reused in the future.
This commit is contained in:
Jelle Raaijmakers 2023-05-24 14:53:43 +02:00 • committed by Tim Flynn
parent c5ebc4bb40
commit a6abc1697f
3 changed files with 75 additions and 6 deletions
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9
Userland/Libraries/LibSQL/Heap.h
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@ -11,6 +11,7 @@
#include <AK/Debug.h>
#include <AK/DeprecatedString.h>
#include <AK/HashMap.h>
#include <AK/Vector.h>
#include <LibCore/File.h>
#include <LibCore/Object.h>
@ -39,6 +40,7 @@ public:
, m_next_block(next_block)
, m_data(move(data))
{
VERIFY(index > 0);
}
Index index() const { return m_index; }
@ -73,8 +75,8 @@ public:
ErrorOr<void> open();
ErrorOr<size_t> file_size_in_bytes() const;
bool has_block(Block::Index) const;
[[nodiscard]] Block::Index request_new_block_index() { return m_next_block++; }
[[nodiscard]] bool has_block(Block::Index) const;
[[nodiscard]] Block::Index request_new_block_index();
Block::Index schemas_root() const { return m_schemas_root; }
@ -126,6 +128,8 @@ private:
ErrorOr<Block> read_block(Block::Index);
ErrorOr<void> write_block(Block const&);
ErrorOr<void> free_block(Block const&);
ErrorOr<void> read_zero_block();
ErrorOr<void> initialize_zero_block();
ErrorOr<void> update_zero_block();
@ -139,6 +143,7 @@ private:
u32 m_version { VERSION };
Array<u32, 16> m_user_values { 0 };
HashMap<Block::Index, ByteBuffer> m_write_ahead_log;
Vector<Block::Index> m_free_block_indices;
};
}