Class DentryCache

Class Documentation

class DentryCache

Cache for directory entries to accelerate ls -l type operations.

Public Functions

DentryCache() = default
virtual ~DentryCache() = default
void insert(const std::string &parent_dir, std::string name, cache_entry value)

Insert a new entry in the cache.

Parameters:

  • parent_dir –

  • name –

  • value –

std::optional<cache_entry> get(const std::string &parent_dir, const std::string &name)

Get an entry from the cache for a given directory.

Parameters:

  • parent_dir –

  • name –

Returns:

std::optional<cache_entry>

void clear_dir(const std::string &dir_path)

Clear the cache for a given directory. Called when a directory is closed.

Parameters:

dir_path –

void dump_cache_to_log(const std::string &dir_path)

Dump the cache to the log for debugging purposes. Not used in production.

Parameters:

dir_path –

void clear()

Clear the entire cache.

Private Functions

uint32_t gen_dir_id(const std::string &dir_path)

Generate a unique id for caching a directory.

Parameters:

dir_path –

Returns:

id

uint32_t get_dir_id(const std::string &dir_path)

Get the unique id for a directory to retrieve its entries. Creates an id if it does not exist.

Parameters:

dir_path –

Returns:

id

Private Members

std::unordered_map<uint32_t, std::unordered_map<std::string, cache_entry>> entries_
std::unordered_map<std::string, uint32_t> entry_dir_id_
std::mutex mtx_
std::hash<std::string> str_hash