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Ext2FS: Cache block bitmaps instead of always reading/writing disk

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Add a simple cache to Ext2FS where we keep block bitmaps along with a
dirty bit. This allows us to coalesce bitmap flushes, giving us a nice
~3x improvement in disk_benchmark write speeds.
This commit is contained in:
Andreas Kling
2019-11-02 12:18:43 +01:00
parent 3a8b5b405c
commit 1ae9d85de9
2 changed files with 52 additions and 19 deletions
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17
Kernel/FileSystem/Ext2FileSystem.h
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@@ -1,5 +1,6 @@
#pragma once
#include <AK/Bitmap.h>
#include <Kernel/FileSystem/DiskBackedFileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/ext2_fs.h>
@@ -135,6 +136,22 @@ private:
bool m_super_block_dirty { false };
bool m_block_group_descriptors_dirty { false };
struct CachedBitmap {
CachedBitmap(BlockIndex bi, ByteBuffer&& buf)
: bitmap_block_index(bi)
, buffer(buf)
{}
BlockIndex bitmap_block_index { 0 };
bool dirty { false };
ByteBuffer buffer;
Bitmap bitmap(u32 blocks_per_group) { return Bitmap::wrap(buffer.data(), blocks_per_group); }
};
CachedBitmap& get_block_bitmap(BlockIndex bitmap_block_index);
CachedBitmap& get_inode_bitmap(InodeIndex bitmap_block_index);
Vector<OwnPtr<CachedBitmap>> m_cached_bitmaps;
};
inline Ext2FS& Ext2FSInode::fs()