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Optimize extfs syncing blocks.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-10-01 22:27:19 +02:00
parent 8f0db0f541
commit dc213256c0
4 changed files with 23 additions and 3 deletions
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17
ext/block.cpp
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@ -35,6 +35,8 @@ Block::Block(Device* device, uint32_t block_id)
this->next_block = NULL;
this->prev_hashed = NULL;
this->next_hashed = NULL;
this->prev_dirty = NULL;
this->next_dirty = NULL;
this->device = device;
this->reference_count = 1;
this->block_id = block_id;
@ -69,6 +71,11 @@ void Block::Sync()
if ( !dirty )
return;
dirty = false;
(prev_dirty ? prev_dirty->next_dirty : device->dirty_block) = next_dirty;
if ( next_dirty )
next_dirty->prev_dirty = prev_dirty;
prev_dirty = NULL;
next_dirty = NULL;
if ( !device->write )
return;
off_t file_offset = (off_t) device->block_size * (off_t) block_id;
@ -77,7 +84,15 @@ void Block::Sync()
void Block::Dirty()
{
dirty = true;
if ( !dirty )
{
dirty = true;
prev_dirty = NULL;
next_dirty = device->dirty_block;
if ( next_dirty )
next_dirty->prev_dirty = this;
device->dirty_block = this;
}
Use();
}

2
ext/block.h
View file

@ -36,6 +36,8 @@ public:
Block* next_block;
Block* prev_hashed;
Block* next_hashed;
Block* prev_dirty;
Block* next_dirty;
Device* device;
size_t reference_count;
uint32_t block_id;

6
ext/device.cpp
View file

@ -23,6 +23,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
@ -41,6 +42,7 @@ Device::Device(int fd, uint32_t block_size, bool write)
this->device_size = st.st_size;
this->mru_block = NULL;
this->lru_block = NULL;
this->dirty_block = NULL;
for ( size_t i = 0; i < DEVICE_HASH_LENGTH; i++ )
hash_blocks[i] = NULL;
}
@ -91,6 +93,6 @@ Block* Device::GetCachedBlock(uint32_t block_id)
void Device::Sync()
{
for ( Block* iter = mru_block; iter; iter = iter->next_block )
iter->Sync();
while ( dirty_block )
dirty_block->Sync();
}

1
ext/device.h
View file

@ -36,6 +36,7 @@ public:
public:
Block* mru_block;
Block* lru_block;
Block* dirty_block;
Block* hash_blocks[DEVICE_HASH_LENGTH];
off_t device_size;
uint32_t block_size;