Disks.cc File Reference

#include "squid.h"
#include "base/IoManip.h"
#include "cache_cf.h"
#include "ConfigParser.h"
#include "debug/Messages.h"
#include "debug/Stream.h"
#include "globals.h"
#include "sbuf/Stream.h"
#include "SquidConfig.h"
#include "Store.h"
#include "store/Disk.h"
#include "store/Disks.h"
#include "store_rebuild.h"
#include "StoreFileSystem.h"
#include "swap_log_op.h"
#include "tools.h"

Include dependency graph for Disks.cc:

Go to the source code of this file.

Typedefs
typedef SwapDir *	STDIRSELECT(const StoreEntry *e)

Functions
static int64_t	objectSizeForDirSelection (const StoreEntry &entry)
static SwapDir &	SwapDirByIndex (const int i)
	TODO: Remove when cache_dir-iterating functions are converted to Disks methods. More...
static SwapDir *	storeDirSelectSwapDirRoundRobin (const StoreEntry *e)
static SwapDir *	storeDirSelectSwapDirLeastLoad (const StoreEntry *e)
void	storeDirOpenSwapLogs ()
void	storeDirCloseSwapLogs ()
int	storeDirWriteCleanLogs (int reopen)
void	allocate_new_swapdir (Store::DiskConfig &swap)
void	free_cachedir (Store::DiskConfig *swap)
void	storeDirSwapLog (const StoreEntry *e, int op)

Variables
static STDIRSELECT	storeDirSelectSwapDirRoundRobin
static STDIRSELECT	storeDirSelectSwapDirLeastLoad
static STDIRSELECT *	storeDirSelectSwapDir = storeDirSelectSwapDirLeastLoad

Typedef Documentation

STDIRSELECT

typedef SwapDir* STDIRSELECT(const StoreEntry *e)

Definition at line 28 of file Disks.cc.

Function Documentation

allocate_new_swapdir()

void allocate_new_swapdir

(

Store::DiskConfig &

swap

)

Definition at line 787 of file Disks.cc.

References Store::DiskConfig::n_allocated, Store::DiskConfig::n_configured, and Store::DiskConfig::swapDirs.

Referenced by addSwapDir(), and Store::Disks::Parse().

free_cachedir()

void free_cachedir

(

Store::DiskConfig *

swap

)

Definition at line 806 of file Disks.cc.

References Store::DiskConfig::n_allocated, Store::DiskConfig::n_configured, reconfiguring, and Store::DiskConfig::swapDirs.

Referenced by TestRock::tearDown(), TestStoreHashIndex::testMaxSize(), TestStoreController::testMaxSize(), TestStoreController::testStats(), TestStoreHashIndex::testStats(), TestUfs::testUfsDefaultEngine(), and TestUfs::testUfsSearch().

objectSizeForDirSelection()

static int64_t objectSizeForDirSelection ( const StoreEntry &  entry )

static

The entry size to use for Disk::canStore() size limit checks. This is an optimization to avoid similar calculations in every cache_dir.

Definition at line 41 of file Disks.cc.

References assert, MemObject::endOffset(), MemObject::expectedReplySize(), StoreEntry::mem_obj, and MemObject::swap_hdr_sz.

Referenced by storeDirSelectSwapDirLeastLoad(), and storeDirSelectSwapDirRoundRobin().

storeDirCloseSwapLogs()

void storeDirCloseSwapLogs

(

)

Definition at line 684 of file Disks.cc.

References SquidConfig::cacheSwap, Store::Disk::closeLog(), Config, Store::DiskConfig::n_configured, and SwapDirByIndex().

Referenced by mainReconfigureStart().

storeDirOpenSwapLogs()

void storeDirOpenSwapLogs

(

)

Definition at line 677 of file Disks.cc.

References SquidConfig::cacheSwap, Config, Store::DiskConfig::n_configured, Store::Disk::openLog(), and SwapDirByIndex().

Referenced by mainReconfigureFinish(), and storeDirWriteCleanLogs().

storeDirSelectSwapDirLeastLoad()

static SwapDir* storeDirSelectSwapDirLeastLoad ( const StoreEntry *  e )

static

Spread load across all of the store directories

Note: We should modify this later on to prefer sticking objects in the tightest fit swapdir to conserve space, along with the actual swapdir usage. But for now, this hack will do while testing, so you should order your swapdirs in the config file from smallest max-size= to largest max-size=.

We also have to choose nleast == nconf since we need to consider ALL swapdirs, regardless of state. Again, this is a hack while we sort out the real usefulness of this algorithm.

Definition at line 115 of file Disks.cc.

References SquidConfig::cacheSwap, Config, Store::Disk::flags, INT_MAX, Store::DiskConfig::n_configured, objectSizeForDirSelection(), Store::Disk::Flags::selected, and SwapDirByIndex().

storeDirSelectSwapDirRoundRobin()

static SwapDir* storeDirSelectSwapDirRoundRobin ( const StoreEntry *  e )

static

This new selection scheme simply does round-robin on all SwapDirs. A SwapDir is skipped if it is over the max_size (100%) limit, or overloaded.

Definition at line 73 of file Disks.cc.

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

storeDirSwapLog()

void storeDirSwapLog	(	const StoreEntry *	e,
		int	op
	)

An entry written to the swap log MUST have the following properties.

1. It MUST be a public key. It does no good to log a public ADD, change the key, then log a private DEL. So we need to log a DEL before we change a key from public to private.
2. It MUST have a valid (> -1) swap_filen.

Definition at line 839 of file Disks.cc.

Referenced by Fs::Ufs::RebuildState::addIfFresh(), Store::Disks::evictCached(), StoreEntry::forcePublicKey(), and storeSwapOutFileClosed().

storeDirWriteCleanLogs()

int storeDirWriteCleanLogs

(

int

reopen

)

storeDirWriteCleanLogs

Writes a "clean" swap log file from in-memory metadata. This is a rewrite of the original function to troll each StoreDir and write the logs, and flush at the end of the run. Thanks goes to Eric Stern, since this solution came out of his COSS code.

Definition at line 700 of file Disks.cc.

References SquidConfig::cacheSwap, Config, current_time, DBG_IMPORTANT, debugs, getCurrentTime(), Important, Store::DiskConfig::n_configured, Store::Controller::store_dirs_rebuilding, storeDirOpenSwapLogs(), SwapDirByIndex(), tvSubDsec(), StoreEntry::write(), and Store::Disk::writeCleanDone().

Referenced by death(), fatal(), fatal_dump(), mainRotate(), SquidShutdown(), and TestUfs::testUfsSearch().

SwapDirByIndex()

static SwapDir& SwapDirByIndex ( const int  i )

static

Definition at line 58 of file Disks.cc.

References assert, SquidConfig::cacheSwap, Config, INDEXSD, and Store::DiskConfig::n_allocated.

Referenced by Store::Disks::Dir(), Store::Disks::store(), storeDirCloseSwapLogs(), storeDirOpenSwapLogs(), storeDirSelectSwapDirLeastLoad(), storeDirSelectSwapDirRoundRobin(), and storeDirWriteCleanLogs().

Variable Documentation

storeDirSelectSwapDir

STDIRSELECT* storeDirSelectSwapDir = storeDirSelectSwapDirLeastLoad

static

This function pointer is set according to 'store_dir_select_algorithm' in squid.conf.

Definition at line 36 of file Disks.cc.

Referenced by Store::Disks::init(), and Store::Disks::SelectSwapDir().

storeDirSelectSwapDirLeastLoad

STDIRSELECT storeDirSelectSwapDirLeastLoad

static

Definition at line 31 of file Disks.cc.

Referenced by Store::Disks::init().

storeDirSelectSwapDirRoundRobin

STDIRSELECT storeDirSelectSwapDirRoundRobin

static

Definition at line 30 of file Disks.cc.

Referenced by Store::Disks::init().