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Hash extfs inode cache lookup.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-10-02 00:41:35 +02:00
parent dc213256c0
commit 677435aa94
4 changed files with 20 additions and 1 deletions
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5
ext/filesystem.cpp
View file

@ -51,6 +51,8 @@ Filesystem::Filesystem(Device* device)
mru_inode = NULL;
lru_inode = NULL;
dirty_inode = NULL;
for ( size_t i = 0; i < INODE_HASH_LENGTH; i++ )
hash_inodes[i] = NULL;
inode_size = this->sb->s_inode_size;
num_blocks = sb->s_blocks_count;
num_groups = divup(this->sb->s_blocks_count, this->sb->s_blocks_per_group);
@ -140,7 +142,8 @@ Inode* Filesystem::GetInode(uint32_t inode_id)
assert(inode_id);
assert(inode_id < num_inodes);
for ( Inode* iter = mru_inode; iter; iter = iter->next_inode )
size_t bin = inode_id % INODE_HASH_LENGTH;
for ( Inode* iter = hash_inodes[bin]; iter; iter = iter->next_hashed )
if ( iter->inode_id == inode_id )
return iter->Refer(), iter;

3
ext/filesystem.h
View file

@ -27,6 +27,8 @@ class BlockGroup;
class Device;
class Inode;
const size_t INODE_HASH_LENGTH = 1 << 16;
class Filesystem
{
public:
@ -46,6 +48,7 @@ public:
Inode* mru_inode;
Inode* lru_inode;
Inode* dirty_inode;
Inode* hash_inodes[INODE_HASH_LENGTH];
time_t mtime_realtime;
time_t mtime_monotonic;
bool dirty;

11
ext/inode.cpp
View file

@ -53,6 +53,8 @@ Inode::Inode(Filesystem* filesystem, uint32_t inode_id)
{
this->prev_inode = NULL;
this->next_inode = NULL;
this->prev_hashed = NULL;
this->next_hashed = NULL;
this->prev_dirty = NULL;
this->next_dirty = NULL;
this->filesystem = filesystem;
@ -1008,6 +1010,9 @@ void Inode::Unlink()
{
(prev_inode ? prev_inode->next_inode : filesystem->mru_inode) = next_inode;
(next_inode ? next_inode->prev_inode : filesystem->lru_inode) = prev_inode;
size_t bin = inode_id % INODE_HASH_LENGTH;
(prev_hashed ? prev_hashed->next_hashed : filesystem->hash_inodes[bin]) = next_hashed;
if ( next_hashed ) next_hashed->prev_hashed = prev_hashed;
}
void Inode::Prelink()
@ -1019,4 +1024,10 @@ void Inode::Prelink()
filesystem->mru_inode = this;
if ( !filesystem->lru_inode )
filesystem->lru_inode = this;
size_t bin = inode_id % INODE_HASH_LENGTH;
prev_hashed = NULL;
next_hashed = filesystem->hash_inodes[bin];
filesystem->hash_inodes[bin] = this;
if ( next_hashed )
next_hashed->prev_hashed = this;
}

2
ext/inode.h
View file

@ -35,6 +35,8 @@ public:
public:
Inode* prev_inode;
Inode* next_inode;
Inode* prev_hashed;
Inode* next_hashed;
Inode* prev_dirty;
Inode* next_dirty;
Block* data_block;