summary view of all disk caches (cache_dirs) combined More...

#include <Disks.h>

Inheritance diagram for Store::Disks:

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Collaboration diagram for Store::Disks:

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Public Member Functions
	Disks ()

void	create () override
	create system resources needed for this store to operate in the future More...

void	init () override

StoreEntry *	get (const cache_key *) override

uint64_t	maxSize () const override

uint64_t	minSize () const override
	the minimum size the store will shrink to via normal housekeeping More...

uint64_t	currentSize () const override
	current size More...

uint64_t	currentCount () const override
	the total number of objects stored right now More...

int64_t	maxObjectSize () const override
	the maximum size of a storable object; -1 if unlimited More...

void	getStats (StoreInfoStats &stats) const override
	collect statistics More...

void	stat (StoreEntry &) const override

void	sync () override
	prepare for shutdown More...

void	reference (StoreEntry &) override
	somebody needs this entry (many cache replacement policies need to know) More...

bool	dereference (StoreEntry &e) override

void	updateHeaders (StoreEntry *) override
	make stored metadata and HTTP headers the same as in the given entry More...

void	maintain () override
	perform regular periodic maintenance; TODO: move to UFSSwapDir::Maintain More...

bool	anchorToCache (StoreEntry &) override

bool	updateAnchored (StoreEntry &) override

void	evictCached (StoreEntry &) override

void	evictIfFound (const cache_key *) override

int	callback () override
	called once every main loop iteration; TODO: Move to UFS code. More...

void	configure ()
	update configuration, including limits (re)calculation More...

int64_t	accumulateMore (const StoreEntry &) const

bool	hasReadableEntry (const StoreEntry &) const
	whether any of disk caches has entry with e.key More...

Static Public Member Functions
static void	Parse (DiskConfig &)
	parses a single cache_dir configuration line More...

static void	Dump (const DiskConfig &, StoreEntry &, const char *name)
	prints the configuration into the provided StoreEntry More...

static bool	SmpAware ()
	whether any disk cache is SMP-aware More...

static SwapDir *	SelectSwapDir (const StoreEntry *)

Private Member Functions
SwapDir *	store (int const x) const

Static Private Member Functions
static SwapDir &	Dir (int const idx)

Private Attributes
int64_t	largestMinimumObjectSize
	maximum of all Disk::minObjectSize()s More...

int64_t	largestMaximumObjectSize
	maximum of all Disk::maxObjectSize()s More...

int64_t	secondLargestMaximumObjectSize
	the second-biggest Disk::maxObjectSize() More...

Detailed Description

Definition at line 18 of file Disks.h.

Constructor & Destructor Documentation

◆ Disks()

Store::Disks::Disks ( )

Definition at line 168 of file Disks.cc.

Member Function Documentation

◆ accumulateMore()

int64_t Store::Disks::accumulateMore ( const StoreEntry & entry ) const

Additional unknown-size entry bytes required by disks in order to reduce the risk of selecting the wrong disk cache for the growing entry.

Definition at line 479 of file Disks.cc.

References MemObject::availableForSwapOut(), debugs, and StoreEntry::mem_obj.

◆ anchorToCache()

bool Store::Disks::anchorToCache ( StoreEntry & )

overridevirtual

tie StoreEntry to this storage if this storage has a matching entry

Return values

true	if this storage has a matching entry

Reimplemented from Store::Controlled.

Definition at line 612 of file Disks.cc.

References Store::Disk::active(), Store::Controlled::anchorToCache(), SquidConfig::cacheSwap, Config, debugs, StoreEntry::hasDisk(), and Store::DiskConfig::n_configured.

◆ callback()

int Store::Disks::callback ( )

overridevirtual

Reimplemented from Store::Storage.

Definition at line 188 of file Disks.cc.

References SquidConfig::cacheSwap, Config, fatal(), and Store::DiskConfig::n_configured.

◆ configure()

void Store::Disks::configure ( )

Definition at line 380 of file Disks.cc.

References assert, SquidConfig::cacheSwap, Config, InDaemonMode(), Store::DiskConfig::n_configured, Store::DiskConfig::n_strands, Store::Controller::store_dirs_rebuilding, Store::DiskConfig::swapDirs, and SquidConfig::workers.

◆ create()

void Store::Disks::create ( )

overridevirtual

Implements Store::Storage.

Definition at line 220 of file Disks.cc.

References SquidConfig::cacheSwap, Config, DBG_CRITICAL, DBG_PARSE_NOTE, debugs, and Store::DiskConfig::n_configured.

◆ currentCount()

uint64_t Store::Disks::currentCount ( ) const

overridevirtual

Implements Store::Storage.

Definition at line 361 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ currentSize()

uint64_t Store::Disks::currentSize ( ) const

overridevirtual

Implements Store::Storage.

Definition at line 348 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ dereference()

bool Store::Disks::dereference ( StoreEntry & e )

overridevirtual

somebody no longer needs this entry (usually after calling reference()) return false iff the idle entry should be destroyed

Implements Store::Controlled.

Definition at line 551 of file Disks.cc.

References Store::Disk::dereference(), and StoreEntry::disk().

◆ Dir()

SwapDir & Store::Disks::Dir ( int const idx )

staticprivate

Definition at line 182 of file Disks.cc.

References SwapDirByIndex().

◆ Dump()

void Store::Disks::Dump	(	const DiskConfig &	swap,
		StoreEntry &	entry,
		const char *	name
	)

static

Definition at line 468 of file Disks.cc.

References Store::DiskConfig::n_configured, and storeAppendPrintf().

Referenced by dump_cachedir().

◆ evictCached()

void Store::Disks::evictCached ( StoreEntry & e )

overridevirtual

Prevent new get() calls from returning the matching entry. If the matching entry is unused, it may be removed from the store now. The store entry is matched using either e attachment info or e.key.

Implements Store::Storage.

Definition at line 586 of file Disks.cc.

References StoreEntry::disk(), EBIT_TEST, Store::Storage::evictCached(), StoreEntry::flags, StoreEntry::hasDisk(), KEY_PRIVATE, StoreEntry::publicKey(), storeDirSwapLog(), and SWAP_LOG_DEL.

◆ evictIfFound()

void Store::Disks::evictIfFound ( const cache_key * )

overridevirtual

An evictCached() equivalent for callers that did not get() a StoreEntry. Callers with StoreEntry objects must use evictCached() instead.

Implements Store::Storage.

Definition at line 603 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ get()

StoreEntry * Store::Disks::get ( const cache_key * )

overridevirtual

Returns: a possibly unlocked/unregistered stored entry with key (or nil) The returned entry might not match the caller's Store ID or method. The caller must abandon()/release() the entry or register it with Root(). This method must not trigger slow I/O operations (e.g., disk swap in).

Implements Store::Controlled.

Definition at line 233 of file Disks.cc.

References SquidConfig::cacheSwap, Config, debugs, Store::DiskConfig::n_configured, and storeKeyText().

◆ getStats()

void Store::Disks::getStats ( StoreInfoStats & stats ) const

overridevirtual

Implements Store::Storage.

Definition at line 516 of file Disks.cc.

References SquidConfig::cacheSwap, Config, Store::DiskConfig::n_configured, Ping::stats, and store_open_disk_fd.

◆ hasReadableEntry()

bool Store::Disks::hasReadableEntry ( const StoreEntry & e ) const

Definition at line 667 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ init()

void Store::Disks::init ( )

overridevirtual

Start preparing the store for use. To check readiness, callers should use readable() and writable() methods.

Implements Store::Storage.

Definition at line 259 of file Disks.cc.

References SquidConfig::avgObjectSize, buckets, SquidConfig::cacheSwap, Config, DBG_IMPORTANT, debugs, fatal(), hash_create(), Important, Store::Controller::maxSize(), SquidConfig::memMaxSize, SquidConfig::memShared, Store::DiskConfig::n_configured, SquidConfig::objectsPerBucket, Store::Root(), SquidConfig::Store, SquidConfig::store_dir_select_algorithm, Store::Controller::store_dirs_rebuilding, store_hash_buckets, store_table, storeDirSelectSwapDir, storeDirSelectSwapDirLeastLoad, storeDirSelectSwapDirRoundRobin, storeKeyHashBuckets(), storeKeyHashCmp, storeKeyHashHash, and storeRebuildComplete().

◆ maintain()

void Store::Disks::maintain ( )

overridevirtual

Implements Store::Storage.

Definition at line 564 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ maxObjectSize()

int64_t Store::Disks::maxObjectSize ( ) const

overridevirtual

Implements Store::Storage.

Definition at line 374 of file Disks.cc.

◆ maxSize()

uint64_t Store::Disks::maxSize ( ) const

overridevirtual

The maximum size the store will support in normal use. Inaccuracy is permitted, but may throw estimates for memory etc out of whack.

Implements Store::Storage.

Definition at line 322 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ minSize()

uint64_t Store::Disks::minSize ( ) const

overridevirtual

Implements Store::Storage.

Definition at line 335 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ Parse()

void Store::Disks::Parse ( DiskConfig & swap )

static

Definition at line 415 of file Disks.cc.

References allocate_new_swapdir(), DBG_CRITICAL, DBG_IMPORTANT, DBG_PARSE_NOTE, debugs, StoreFileSystem::FindByType(), Here, Store::DiskConfig::n_configured, ConfigParser::NextToken(), Store::DiskConfig::swapDirs, and ToSBuf().

Referenced by parse_cachedir().

◆ reference()

void Store::Disks::reference ( StoreEntry & e )

overridevirtual

Implements Store::Controlled.

Definition at line 545 of file Disks.cc.

References StoreEntry::disk(), and Store::Disk::reference().

◆ SelectSwapDir()

SwapDir * Store::Disks::SelectSwapDir ( const StoreEntry * e )

static

Definition at line 661 of file Disks.cc.

References storeDirSelectSwapDir.

Referenced by storeCreate().

◆ SmpAware()

bool Store::Disks::SmpAware ( )

static

Definition at line 648 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

Referenced by Store::Controller::SmpAware().

◆ stat()

void Store::Disks::stat ( StoreEntry & e ) const

overridevirtual

Output stats to the provided store entry. TODO: make these calls asynchronous

Implements Store::Storage.

Definition at line 532 of file Disks.cc.

References SquidConfig::cacheSwap, Config, Store::DiskConfig::n_configured, and storeAppendPrintf().

◆ store()

SwapDir * Store::Disks::store ( int const x ) const

private

Definition at line 176 of file Disks.cc.

References SwapDirByIndex().

◆ sync()

void Store::Disks::sync ( void )

overridevirtual

Reimplemented from Store::Storage.

Definition at line 579 of file Disks.cc.

References SquidConfig::cacheSwap, Config, and Store::DiskConfig::n_configured.

◆ updateAnchored()

bool Store::Disks::updateAnchored ( StoreEntry & )

overridevirtual

Update a local Transients entry with fresh info from this cache (if any). Return true iff the cache supports Transients entries and the given local Transients entry is now in sync with this storage.

Reimplemented from Store::Controlled.

Definition at line 641 of file Disks.cc.

References StoreEntry::disk(), StoreEntry::hasDisk(), and Store::Controlled::updateAnchored().

◆ updateHeaders()

void Store::Disks::updateHeaders ( StoreEntry * )

overridevirtual

Reimplemented from Store::Controlled.

Definition at line 557 of file Disks.cc.

References StoreEntry::disk(), Must, and Store::Controlled::updateHeaders().

Member Data Documentation

◆ largestMaximumObjectSize

int64_t Store::Disks::largestMaximumObjectSize

private

Definition at line 67 of file Disks.h.

◆ largestMinimumObjectSize

int64_t Store::Disks::largestMinimumObjectSize

private

Definition at line 66 of file Disks.h.

◆ secondLargestMaximumObjectSize

int64_t Store::Disks::secondLargestMaximumObjectSize

private

Definition at line 68 of file Disks.h.

The documentation for this class was generated from the following files:

src/store/Disks.h
src/store/Disks.cc
src/tests/stub_libstore.cc

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Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Disks()

Member Function Documentation

◆ accumulateMore()

◆ anchorToCache()

◆ callback()

◆ configure()

◆ create()

◆ currentCount()

◆ currentSize()

◆ dereference()

◆ Dir()

◆ Dump()

◆ evictCached()

◆ evictIfFound()

◆ get()

◆ getStats()

◆ hasReadableEntry()

◆ init()

◆ maintain()

◆ maxObjectSize()

◆ maxSize()

◆ minSize()

◆ Parse()

◆ reference()

◆ SelectSwapDir()

◆ SmpAware()

◆ stat()

◆ store()

◆ sync()

◆ updateAnchored()

◆ updateHeaders()

Member Data Documentation

◆ largestMaximumObjectSize

◆ largestMinimumObjectSize

◆ secondLargestMaximumObjectSize

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