123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391239223932394239523962397239823992400240124022403240424052406240724082409241024112412241324142415241624172418241924202421242224232424242524262427242824292430243124322433243424352436243724382439244024412442244324442445244624472448244924502451245224532454245524562457245824592460246124622463246424652466246724682469247024712472247324742475247624772478247924802481248224832484248524862487248824892490249124922493249424952496249724982499250025012502250325042505250625072508250925102511251225132514251525162517251825192520252125222523252425252526252725282529253025312532253325342535253625372538253925402541254225432544254525462547254825492550255125522553255425552556255725582559256025612562256325642565256625672568256925702571257225732574257525762577257825792580258125822583258425852586258725882589259025912592259325942595259625972598259926002601260226032604260526062607260826092610261126122613261426152616261726182619262026212622262326242625262626272628262926302631263226332634263526362637263826392640264126422643264426452646264726482649265026512652265326542655265626572658265926602661266226632664266526662667266826692670267126722673267426752676267726782679268026812682268326842685268626872688268926902691269226932694269526962697269826992700270127022703270427052706270727082709271027112712271327142715271627172718271927202721272227232724272527262727272827292730273127322733273427352736273727382739274027412742274327442745274627472748274927502751275227532754275527562757275827592760276127622763276427652766276727682769277027712772277327742775277627772778277927802781278227832784278527862787278827892790279127922793279427952796279727982799280028012802280328042805280628072808280928102811281228132814281528162817281828192820282128222823282428252826282728282829283028312832283328342835283628372838283928402841284228432844284528462847284828492850285128522853285428552856285728582859286028612862286328642865286628672868286928702871287228732874287528762877287828792880288128822883288428852886288728882889289028912892289328942895289628972898289929002901290229032904290529062907290829092910291129122913291429152916291729182919292029212922292329242925292629272928292929302931293229332934293529362937293829392940294129422943294429452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692970297129722973297429752976297729782979298029812982298329842985298629872988298929902991299229932994299529962997299829993000300130023003300430053006300730083009301030113012301330143015301630173018301930203021302230233024302530263027302830293030303130323033303430353036303730383039304030413042304330443045304630473048304930503051305230533054305530563057305830593060306130623063306430653066306730683069307030713072307330743075307630773078307930803081308230833084308530863087308830893090309130923093 |
- /*
- * Copyright (C) International Business Machines Corp., 2000-2005
- * Portions Copyright (C) Christoph Hellwig, 2001-2002
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- /*
- * jfs_txnmgr.c: transaction manager
- *
- * notes:
- * transaction starts with txBegin() and ends with txCommit()
- * or txAbort().
- *
- * tlock is acquired at the time of update;
- * (obviate scan at commit time for xtree and dtree)
- * tlock and mp points to each other;
- * (no hashlist for mp -> tlock).
- *
- * special cases:
- * tlock on in-memory inode:
- * in-place tlock in the in-memory inode itself;
- * converted to page lock by iWrite() at commit time.
- *
- * tlock during write()/mmap() under anonymous transaction (tid = 0):
- * transferred (?) to transaction at commit time.
- *
- * use the page itself to update allocation maps
- * (obviate intermediate replication of allocation/deallocation data)
- * hold on to mp+lock thru update of maps
- */
- #include <linux/fs.h>
- #include <linux/vmalloc.h>
- #include <linux/completion.h>
- #include <linux/freezer.h>
- #include <linux/module.h>
- #include <linux/moduleparam.h>
- #include <linux/kthread.h>
- #include <linux/seq_file.h>
- #include "jfs_incore.h"
- #include "jfs_inode.h"
- #include "jfs_filsys.h"
- #include "jfs_metapage.h"
- #include "jfs_dinode.h"
- #include "jfs_imap.h"
- #include "jfs_dmap.h"
- #include "jfs_superblock.h"
- #include "jfs_debug.h"
- /*
- * transaction management structures
- */
- static struct {
- int freetid; /* index of a free tid structure */
- int freelock; /* index first free lock word */
- wait_queue_head_t freewait; /* eventlist of free tblock */
- wait_queue_head_t freelockwait; /* eventlist of free tlock */
- wait_queue_head_t lowlockwait; /* eventlist of ample tlocks */
- int tlocksInUse; /* Number of tlocks in use */
- spinlock_t LazyLock; /* synchronize sync_queue & unlock_queue */
- /* struct tblock *sync_queue; * Transactions waiting for data sync */
- struct list_head unlock_queue; /* Txns waiting to be released */
- struct list_head anon_list; /* inodes having anonymous txns */
- struct list_head anon_list2; /* inodes having anonymous txns
- that couldn't be sync'ed */
- } TxAnchor;
- int jfs_tlocks_low; /* Indicates low number of available tlocks */
- #ifdef CONFIG_JFS_STATISTICS
- static struct {
- uint txBegin;
- uint txBegin_barrier;
- uint txBegin_lockslow;
- uint txBegin_freetid;
- uint txBeginAnon;
- uint txBeginAnon_barrier;
- uint txBeginAnon_lockslow;
- uint txLockAlloc;
- uint txLockAlloc_freelock;
- } TxStat;
- #endif
- static int nTxBlock = -1; /* number of transaction blocks */
- module_param(nTxBlock, int, 0);
- MODULE_PARM_DESC(nTxBlock,
- "Number of transaction blocks (max:65536)");
- static int nTxLock = -1; /* number of transaction locks */
- module_param(nTxLock, int, 0);
- MODULE_PARM_DESC(nTxLock,
- "Number of transaction locks (max:65536)");
- struct tblock *TxBlock; /* transaction block table */
- static int TxLockLWM; /* Low water mark for number of txLocks used */
- static int TxLockHWM; /* High water mark for number of txLocks used */
- static int TxLockVHWM; /* Very High water mark */
- struct tlock *TxLock; /* transaction lock table */
- /*
- * transaction management lock
- */
- static DEFINE_SPINLOCK(jfsTxnLock);
- #define TXN_LOCK() spin_lock(&jfsTxnLock)
- #define TXN_UNLOCK() spin_unlock(&jfsTxnLock)
- #define LAZY_LOCK_INIT() spin_lock_init(&TxAnchor.LazyLock);
- #define LAZY_LOCK(flags) spin_lock_irqsave(&TxAnchor.LazyLock, flags)
- #define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
- static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait);
- static int jfs_commit_thread_waking;
- /*
- * Retry logic exist outside these macros to protect from spurrious wakeups.
- */
- static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
- {
- DECLARE_WAITQUEUE(wait, current);
- add_wait_queue(event, &wait);
- set_current_state(TASK_UNINTERRUPTIBLE);
- TXN_UNLOCK();
- io_schedule();
- remove_wait_queue(event, &wait);
- }
- #define TXN_SLEEP(event)\
- {\
- TXN_SLEEP_DROP_LOCK(event);\
- TXN_LOCK();\
- }
- #define TXN_WAKEUP(event) wake_up_all(event)
- /*
- * statistics
- */
- static struct {
- tid_t maxtid; /* 4: biggest tid ever used */
- lid_t maxlid; /* 4: biggest lid ever used */
- int ntid; /* 4: # of transactions performed */
- int nlid; /* 4: # of tlocks acquired */
- int waitlock; /* 4: # of tlock wait */
- } stattx;
- /*
- * forward references
- */
- static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck, struct commit * cd);
- static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck);
- static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck);
- static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck);
- static void txAllocPMap(struct inode *ip, struct maplock * maplock,
- struct tblock * tblk);
- static void txForce(struct tblock * tblk);
- static int txLog(struct jfs_log * log, struct tblock * tblk,
- struct commit * cd);
- static void txUpdateMap(struct tblock * tblk);
- static void txRelease(struct tblock * tblk);
- static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck);
- static void LogSyncRelease(struct metapage * mp);
- /*
- * transaction block/lock management
- * ---------------------------------
- */
- /*
- * Get a transaction lock from the free list. If the number in use is
- * greater than the high water mark, wake up the sync daemon. This should
- * free some anonymous transaction locks. (TXN_LOCK must be held.)
- */
- static lid_t txLockAlloc(void)
- {
- lid_t lid;
- INCREMENT(TxStat.txLockAlloc);
- if (!TxAnchor.freelock) {
- INCREMENT(TxStat.txLockAlloc_freelock);
- }
- while (!(lid = TxAnchor.freelock))
- TXN_SLEEP(&TxAnchor.freelockwait);
- TxAnchor.freelock = TxLock[lid].next;
- HIGHWATERMARK(stattx.maxlid, lid);
- if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) {
- jfs_info("txLockAlloc tlocks low");
- jfs_tlocks_low = 1;
- wake_up_process(jfsSyncThread);
- }
- return lid;
- }
- static void txLockFree(lid_t lid)
- {
- TxLock[lid].tid = 0;
- TxLock[lid].next = TxAnchor.freelock;
- TxAnchor.freelock = lid;
- TxAnchor.tlocksInUse--;
- if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) {
- jfs_info("txLockFree jfs_tlocks_low no more");
- jfs_tlocks_low = 0;
- TXN_WAKEUP(&TxAnchor.lowlockwait);
- }
- TXN_WAKEUP(&TxAnchor.freelockwait);
- }
- /*
- * NAME: txInit()
- *
- * FUNCTION: initialize transaction management structures
- *
- * RETURN:
- *
- * serialization: single thread at jfs_init()
- */
- int txInit(void)
- {
- int k, size;
- struct sysinfo si;
- /* Set defaults for nTxLock and nTxBlock if unset */
- if (nTxLock == -1) {
- if (nTxBlock == -1) {
- /* Base default on memory size */
- si_meminfo(&si);
- if (si.totalram > (256 * 1024)) /* 1 GB */
- nTxLock = 64 * 1024;
- else
- nTxLock = si.totalram >> 2;
- } else if (nTxBlock > (8 * 1024))
- nTxLock = 64 * 1024;
- else
- nTxLock = nTxBlock << 3;
- }
- if (nTxBlock == -1)
- nTxBlock = nTxLock >> 3;
- /* Verify tunable parameters */
- if (nTxBlock < 16)
- nTxBlock = 16; /* No one should set it this low */
- if (nTxBlock > 65536)
- nTxBlock = 65536;
- if (nTxLock < 256)
- nTxLock = 256; /* No one should set it this low */
- if (nTxLock > 65536)
- nTxLock = 65536;
- printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n",
- nTxBlock, nTxLock);
- /*
- * initialize transaction block (tblock) table
- *
- * transaction id (tid) = tblock index
- * tid = 0 is reserved.
- */
- TxLockLWM = (nTxLock * 4) / 10;
- TxLockHWM = (nTxLock * 7) / 10;
- TxLockVHWM = (nTxLock * 8) / 10;
- size = sizeof(struct tblock) * nTxBlock;
- TxBlock = vmalloc(size);
- if (TxBlock == NULL)
- return -ENOMEM;
- for (k = 1; k < nTxBlock - 1; k++) {
- TxBlock[k].next = k + 1;
- init_waitqueue_head(&TxBlock[k].gcwait);
- init_waitqueue_head(&TxBlock[k].waitor);
- }
- TxBlock[k].next = 0;
- init_waitqueue_head(&TxBlock[k].gcwait);
- init_waitqueue_head(&TxBlock[k].waitor);
- TxAnchor.freetid = 1;
- init_waitqueue_head(&TxAnchor.freewait);
- stattx.maxtid = 1; /* statistics */
- /*
- * initialize transaction lock (tlock) table
- *
- * transaction lock id = tlock index
- * tlock id = 0 is reserved.
- */
- size = sizeof(struct tlock) * nTxLock;
- TxLock = vmalloc(size);
- if (TxLock == NULL) {
- vfree(TxBlock);
- return -ENOMEM;
- }
- /* initialize tlock table */
- for (k = 1; k < nTxLock - 1; k++)
- TxLock[k].next = k + 1;
- TxLock[k].next = 0;
- init_waitqueue_head(&TxAnchor.freelockwait);
- init_waitqueue_head(&TxAnchor.lowlockwait);
- TxAnchor.freelock = 1;
- TxAnchor.tlocksInUse = 0;
- INIT_LIST_HEAD(&TxAnchor.anon_list);
- INIT_LIST_HEAD(&TxAnchor.anon_list2);
- LAZY_LOCK_INIT();
- INIT_LIST_HEAD(&TxAnchor.unlock_queue);
- stattx.maxlid = 1; /* statistics */
- return 0;
- }
- /*
- * NAME: txExit()
- *
- * FUNCTION: clean up when module is unloaded
- */
- void txExit(void)
- {
- vfree(TxLock);
- TxLock = NULL;
- vfree(TxBlock);
- TxBlock = NULL;
- }
- /*
- * NAME: txBegin()
- *
- * FUNCTION: start a transaction.
- *
- * PARAMETER: sb - superblock
- * flag - force for nested tx;
- *
- * RETURN: tid - transaction id
- *
- * note: flag force allows to start tx for nested tx
- * to prevent deadlock on logsync barrier;
- */
- tid_t txBegin(struct super_block *sb, int flag)
- {
- tid_t t;
- struct tblock *tblk;
- struct jfs_log *log;
- jfs_info("txBegin: flag = 0x%x", flag);
- log = JFS_SBI(sb)->log;
- TXN_LOCK();
- INCREMENT(TxStat.txBegin);
- retry:
- if (!(flag & COMMIT_FORCE)) {
- /*
- * synchronize with logsync barrier
- */
- if (test_bit(log_SYNCBARRIER, &log->flag) ||
- test_bit(log_QUIESCE, &log->flag)) {
- INCREMENT(TxStat.txBegin_barrier);
- TXN_SLEEP(&log->syncwait);
- goto retry;
- }
- }
- if (flag == 0) {
- /*
- * Don't begin transaction if we're getting starved for tlocks
- * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
- * free tlocks)
- */
- if (TxAnchor.tlocksInUse > TxLockVHWM) {
- INCREMENT(TxStat.txBegin_lockslow);
- TXN_SLEEP(&TxAnchor.lowlockwait);
- goto retry;
- }
- }
- /*
- * allocate transaction id/block
- */
- if ((t = TxAnchor.freetid) == 0) {
- jfs_info("txBegin: waiting for free tid");
- INCREMENT(TxStat.txBegin_freetid);
- TXN_SLEEP(&TxAnchor.freewait);
- goto retry;
- }
- tblk = tid_to_tblock(t);
- if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) {
- /* Don't let a non-forced transaction take the last tblk */
- jfs_info("txBegin: waiting for free tid");
- INCREMENT(TxStat.txBegin_freetid);
- TXN_SLEEP(&TxAnchor.freewait);
- goto retry;
- }
- TxAnchor.freetid = tblk->next;
- /*
- * initialize transaction
- */
- /*
- * We can't zero the whole thing or we screw up another thread being
- * awakened after sleeping on tblk->waitor
- *
- * memset(tblk, 0, sizeof(struct tblock));
- */
- tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0;
- tblk->sb = sb;
- ++log->logtid;
- tblk->logtid = log->logtid;
- ++log->active;
- HIGHWATERMARK(stattx.maxtid, t); /* statistics */
- INCREMENT(stattx.ntid); /* statistics */
- TXN_UNLOCK();
- jfs_info("txBegin: returning tid = %d", t);
- return t;
- }
- /*
- * NAME: txBeginAnon()
- *
- * FUNCTION: start an anonymous transaction.
- * Blocks if logsync or available tlocks are low to prevent
- * anonymous tlocks from depleting supply.
- *
- * PARAMETER: sb - superblock
- *
- * RETURN: none
- */
- void txBeginAnon(struct super_block *sb)
- {
- struct jfs_log *log;
- log = JFS_SBI(sb)->log;
- TXN_LOCK();
- INCREMENT(TxStat.txBeginAnon);
- retry:
- /*
- * synchronize with logsync barrier
- */
- if (test_bit(log_SYNCBARRIER, &log->flag) ||
- test_bit(log_QUIESCE, &log->flag)) {
- INCREMENT(TxStat.txBeginAnon_barrier);
- TXN_SLEEP(&log->syncwait);
- goto retry;
- }
- /*
- * Don't begin transaction if we're getting starved for tlocks
- */
- if (TxAnchor.tlocksInUse > TxLockVHWM) {
- INCREMENT(TxStat.txBeginAnon_lockslow);
- TXN_SLEEP(&TxAnchor.lowlockwait);
- goto retry;
- }
- TXN_UNLOCK();
- }
- /*
- * txEnd()
- *
- * function: free specified transaction block.
- *
- * logsync barrier processing:
- *
- * serialization:
- */
- void txEnd(tid_t tid)
- {
- struct tblock *tblk = tid_to_tblock(tid);
- struct jfs_log *log;
- jfs_info("txEnd: tid = %d", tid);
- TXN_LOCK();
- /*
- * wakeup transactions waiting on the page locked
- * by the current transaction
- */
- TXN_WAKEUP(&tblk->waitor);
- log = JFS_SBI(tblk->sb)->log;
- /*
- * Lazy commit thread can't free this guy until we mark it UNLOCKED,
- * otherwise, we would be left with a transaction that may have been
- * reused.
- *
- * Lazy commit thread will turn off tblkGC_LAZY before calling this
- * routine.
- */
- if (tblk->flag & tblkGC_LAZY) {
- jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk);
- TXN_UNLOCK();
- spin_lock_irq(&log->gclock); // LOGGC_LOCK
- tblk->flag |= tblkGC_UNLOCKED;
- spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
- return;
- }
- jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk);
- assert(tblk->next == 0);
- /*
- * insert tblock back on freelist
- */
- tblk->next = TxAnchor.freetid;
- TxAnchor.freetid = tid;
- /*
- * mark the tblock not active
- */
- if (--log->active == 0) {
- clear_bit(log_FLUSH, &log->flag);
- /*
- * synchronize with logsync barrier
- */
- if (test_bit(log_SYNCBARRIER, &log->flag)) {
- TXN_UNLOCK();
- /* write dirty metadata & forward log syncpt */
- jfs_syncpt(log, 1);
- jfs_info("log barrier off: 0x%x", log->lsn);
- /* enable new transactions start */
- clear_bit(log_SYNCBARRIER, &log->flag);
- /* wakeup all waitors for logsync barrier */
- TXN_WAKEUP(&log->syncwait);
- goto wakeup;
- }
- }
- TXN_UNLOCK();
- wakeup:
- /*
- * wakeup all waitors for a free tblock
- */
- TXN_WAKEUP(&TxAnchor.freewait);
- }
- /*
- * txLock()
- *
- * function: acquire a transaction lock on the specified <mp>
- *
- * parameter:
- *
- * return: transaction lock id
- *
- * serialization:
- */
- struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
- int type)
- {
- struct jfs_inode_info *jfs_ip = JFS_IP(ip);
- int dir_xtree = 0;
- lid_t lid;
- tid_t xtid;
- struct tlock *tlck;
- struct xtlock *xtlck;
- struct linelock *linelock;
- xtpage_t *p;
- struct tblock *tblk;
- TXN_LOCK();
- if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) &&
- !(mp->xflag & COMMIT_PAGE)) {
- /*
- * Directory inode is special. It can have both an xtree tlock
- * and a dtree tlock associated with it.
- */
- dir_xtree = 1;
- lid = jfs_ip->xtlid;
- } else
- lid = mp->lid;
- /* is page not locked by a transaction ? */
- if (lid == 0)
- goto allocateLock;
- jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid);
- /* is page locked by the requester transaction ? */
- tlck = lid_to_tlock(lid);
- if ((xtid = tlck->tid) == tid) {
- TXN_UNLOCK();
- goto grantLock;
- }
- /*
- * is page locked by anonymous transaction/lock ?
- *
- * (page update without transaction (i.e., file write) is
- * locked under anonymous transaction tid = 0:
- * anonymous tlocks maintained on anonymous tlock list of
- * the inode of the page and available to all anonymous
- * transactions until txCommit() time at which point
- * they are transferred to the transaction tlock list of
- * the committing transaction of the inode)
- */
- if (xtid == 0) {
- tlck->tid = tid;
- TXN_UNLOCK();
- tblk = tid_to_tblock(tid);
- /*
- * The order of the tlocks in the transaction is important
- * (during truncate, child xtree pages must be freed before
- * parent's tlocks change the working map).
- * Take tlock off anonymous list and add to tail of
- * transaction list
- *
- * Note: We really need to get rid of the tid & lid and
- * use list_head's. This code is getting UGLY!
- */
- if (jfs_ip->atlhead == lid) {
- if (jfs_ip->atltail == lid) {
- /* only anonymous txn.
- * Remove from anon_list
- */
- TXN_LOCK();
- list_del_init(&jfs_ip->anon_inode_list);
- TXN_UNLOCK();
- }
- jfs_ip->atlhead = tlck->next;
- } else {
- lid_t last;
- for (last = jfs_ip->atlhead;
- lid_to_tlock(last)->next != lid;
- last = lid_to_tlock(last)->next) {
- assert(last);
- }
- lid_to_tlock(last)->next = tlck->next;
- if (jfs_ip->atltail == lid)
- jfs_ip->atltail = last;
- }
- /* insert the tlock at tail of transaction tlock list */
- if (tblk->next)
- lid_to_tlock(tblk->last)->next = lid;
- else
- tblk->next = lid;
- tlck->next = 0;
- tblk->last = lid;
- goto grantLock;
- }
- goto waitLock;
- /*
- * allocate a tlock
- */
- allocateLock:
- lid = txLockAlloc();
- tlck = lid_to_tlock(lid);
- /*
- * initialize tlock
- */
- tlck->tid = tid;
- TXN_UNLOCK();
- /* mark tlock for meta-data page */
- if (mp->xflag & COMMIT_PAGE) {
- tlck->flag = tlckPAGELOCK;
- /* mark the page dirty and nohomeok */
- metapage_nohomeok(mp);
- jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
- mp, mp->nohomeok, tid, tlck);
- /* if anonymous transaction, and buffer is on the group
- * commit synclist, mark inode to show this. This will
- * prevent the buffer from being marked nohomeok for too
- * long a time.
- */
- if ((tid == 0) && mp->lsn)
- set_cflag(COMMIT_Synclist, ip);
- }
- /* mark tlock for in-memory inode */
- else
- tlck->flag = tlckINODELOCK;
- if (S_ISDIR(ip->i_mode))
- tlck->flag |= tlckDIRECTORY;
- tlck->type = 0;
- /* bind the tlock and the page */
- tlck->ip = ip;
- tlck->mp = mp;
- if (dir_xtree)
- jfs_ip->xtlid = lid;
- else
- mp->lid = lid;
- /*
- * enqueue transaction lock to transaction/inode
- */
- /* insert the tlock at tail of transaction tlock list */
- if (tid) {
- tblk = tid_to_tblock(tid);
- if (tblk->next)
- lid_to_tlock(tblk->last)->next = lid;
- else
- tblk->next = lid;
- tlck->next = 0;
- tblk->last = lid;
- }
- /* anonymous transaction:
- * insert the tlock at head of inode anonymous tlock list
- */
- else {
- tlck->next = jfs_ip->atlhead;
- jfs_ip->atlhead = lid;
- if (tlck->next == 0) {
- /* This inode's first anonymous transaction */
- jfs_ip->atltail = lid;
- TXN_LOCK();
- list_add_tail(&jfs_ip->anon_inode_list,
- &TxAnchor.anon_list);
- TXN_UNLOCK();
- }
- }
- /* initialize type dependent area for linelock */
- linelock = (struct linelock *) & tlck->lock;
- linelock->next = 0;
- linelock->flag = tlckLINELOCK;
- linelock->maxcnt = TLOCKSHORT;
- linelock->index = 0;
- switch (type & tlckTYPE) {
- case tlckDTREE:
- linelock->l2linesize = L2DTSLOTSIZE;
- break;
- case tlckXTREE:
- linelock->l2linesize = L2XTSLOTSIZE;
- xtlck = (struct xtlock *) linelock;
- xtlck->header.offset = 0;
- xtlck->header.length = 2;
- if (type & tlckNEW) {
- xtlck->lwm.offset = XTENTRYSTART;
- } else {
- if (mp->xflag & COMMIT_PAGE)
- p = (xtpage_t *) mp->data;
- else
- p = &jfs_ip->i_xtroot;
- xtlck->lwm.offset =
- le16_to_cpu(p->header.nextindex);
- }
- xtlck->lwm.length = 0; /* ! */
- xtlck->twm.offset = 0;
- xtlck->hwm.offset = 0;
- xtlck->index = 2;
- break;
- case tlckINODE:
- linelock->l2linesize = L2INODESLOTSIZE;
- break;
- case tlckDATA:
- linelock->l2linesize = L2DATASLOTSIZE;
- break;
- default:
- jfs_err("UFO tlock:0x%p", tlck);
- }
- /*
- * update tlock vector
- */
- grantLock:
- tlck->type |= type;
- return tlck;
- /*
- * page is being locked by another transaction:
- */
- waitLock:
- /* Only locks on ipimap or ipaimap should reach here */
- /* assert(jfs_ip->fileset == AGGREGATE_I); */
- if (jfs_ip->fileset != AGGREGATE_I) {
- printk(KERN_ERR "txLock: trying to lock locked page!");
- print_hex_dump(KERN_ERR, "ip: ", DUMP_PREFIX_ADDRESS, 16, 4,
- ip, sizeof(*ip), 0);
- print_hex_dump(KERN_ERR, "mp: ", DUMP_PREFIX_ADDRESS, 16, 4,
- mp, sizeof(*mp), 0);
- print_hex_dump(KERN_ERR, "Locker's tblock: ",
- DUMP_PREFIX_ADDRESS, 16, 4, tid_to_tblock(tid),
- sizeof(struct tblock), 0);
- print_hex_dump(KERN_ERR, "Tlock: ", DUMP_PREFIX_ADDRESS, 16, 4,
- tlck, sizeof(*tlck), 0);
- BUG();
- }
- INCREMENT(stattx.waitlock); /* statistics */
- TXN_UNLOCK();
- release_metapage(mp);
- TXN_LOCK();
- xtid = tlck->tid; /* reacquire after dropping TXN_LOCK */
- jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
- tid, xtid, lid);
- /* Recheck everything since dropping TXN_LOCK */
- if (xtid && (tlck->mp == mp) && (mp->lid == lid))
- TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
- else
- TXN_UNLOCK();
- jfs_info("txLock: awakened tid = %d, lid = %d", tid, lid);
- return NULL;
- }
- /*
- * NAME: txRelease()
- *
- * FUNCTION: Release buffers associated with transaction locks, but don't
- * mark homeok yet. The allows other transactions to modify
- * buffers, but won't let them go to disk until commit record
- * actually gets written.
- *
- * PARAMETER:
- * tblk -
- *
- * RETURN: Errors from subroutines.
- */
- static void txRelease(struct tblock * tblk)
- {
- struct metapage *mp;
- lid_t lid;
- struct tlock *tlck;
- TXN_LOCK();
- for (lid = tblk->next; lid; lid = tlck->next) {
- tlck = lid_to_tlock(lid);
- if ((mp = tlck->mp) != NULL &&
- (tlck->type & tlckBTROOT) == 0) {
- assert(mp->xflag & COMMIT_PAGE);
- mp->lid = 0;
- }
- }
- /*
- * wakeup transactions waiting on a page locked
- * by the current transaction
- */
- TXN_WAKEUP(&tblk->waitor);
- TXN_UNLOCK();
- }
- /*
- * NAME: txUnlock()
- *
- * FUNCTION: Initiates pageout of pages modified by tid in journalled
- * objects and frees their lockwords.
- */
- static void txUnlock(struct tblock * tblk)
- {
- struct tlock *tlck;
- struct linelock *linelock;
- lid_t lid, next, llid, k;
- struct metapage *mp;
- struct jfs_log *log;
- int difft, diffp;
- unsigned long flags;
- jfs_info("txUnlock: tblk = 0x%p", tblk);
- log = JFS_SBI(tblk->sb)->log;
- /*
- * mark page under tlock homeok (its log has been written):
- */
- for (lid = tblk->next; lid; lid = next) {
- tlck = lid_to_tlock(lid);
- next = tlck->next;
- jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck);
- /* unbind page from tlock */
- if ((mp = tlck->mp) != NULL &&
- (tlck->type & tlckBTROOT) == 0) {
- assert(mp->xflag & COMMIT_PAGE);
- /* hold buffer
- */
- hold_metapage(mp);
- assert(mp->nohomeok > 0);
- _metapage_homeok(mp);
- /* inherit younger/larger clsn */
- LOGSYNC_LOCK(log, flags);
- if (mp->clsn) {
- logdiff(difft, tblk->clsn, log);
- logdiff(diffp, mp->clsn, log);
- if (difft > diffp)
- mp->clsn = tblk->clsn;
- } else
- mp->clsn = tblk->clsn;
- LOGSYNC_UNLOCK(log, flags);
- assert(!(tlck->flag & tlckFREEPAGE));
- put_metapage(mp);
- }
- /* insert tlock, and linelock(s) of the tlock if any,
- * at head of freelist
- */
- TXN_LOCK();
- llid = ((struct linelock *) & tlck->lock)->next;
- while (llid) {
- linelock = (struct linelock *) lid_to_tlock(llid);
- k = linelock->next;
- txLockFree(llid);
- llid = k;
- }
- txLockFree(lid);
- TXN_UNLOCK();
- }
- tblk->next = tblk->last = 0;
- /*
- * remove tblock from logsynclist
- * (allocation map pages inherited lsn of tblk and
- * has been inserted in logsync list at txUpdateMap())
- */
- if (tblk->lsn) {
- LOGSYNC_LOCK(log, flags);
- log->count--;
- list_del(&tblk->synclist);
- LOGSYNC_UNLOCK(log, flags);
- }
- }
- /*
- * txMaplock()
- *
- * function: allocate a transaction lock for freed page/entry;
- * for freed page, maplock is used as xtlock/dtlock type;
- */
- struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
- {
- struct jfs_inode_info *jfs_ip = JFS_IP(ip);
- lid_t lid;
- struct tblock *tblk;
- struct tlock *tlck;
- struct maplock *maplock;
- TXN_LOCK();
- /*
- * allocate a tlock
- */
- lid = txLockAlloc();
- tlck = lid_to_tlock(lid);
- /*
- * initialize tlock
- */
- tlck->tid = tid;
- /* bind the tlock and the object */
- tlck->flag = tlckINODELOCK;
- if (S_ISDIR(ip->i_mode))
- tlck->flag |= tlckDIRECTORY;
- tlck->ip = ip;
- tlck->mp = NULL;
- tlck->type = type;
- /*
- * enqueue transaction lock to transaction/inode
- */
- /* insert the tlock at tail of transaction tlock list */
- if (tid) {
- tblk = tid_to_tblock(tid);
- if (tblk->next)
- lid_to_tlock(tblk->last)->next = lid;
- else
- tblk->next = lid;
- tlck->next = 0;
- tblk->last = lid;
- }
- /* anonymous transaction:
- * insert the tlock at head of inode anonymous tlock list
- */
- else {
- tlck->next = jfs_ip->atlhead;
- jfs_ip->atlhead = lid;
- if (tlck->next == 0) {
- /* This inode's first anonymous transaction */
- jfs_ip->atltail = lid;
- list_add_tail(&jfs_ip->anon_inode_list,
- &TxAnchor.anon_list);
- }
- }
- TXN_UNLOCK();
- /* initialize type dependent area for maplock */
- maplock = (struct maplock *) & tlck->lock;
- maplock->next = 0;
- maplock->maxcnt = 0;
- maplock->index = 0;
- return tlck;
- }
- /*
- * txLinelock()
- *
- * function: allocate a transaction lock for log vector list
- */
- struct linelock *txLinelock(struct linelock * tlock)
- {
- lid_t lid;
- struct tlock *tlck;
- struct linelock *linelock;
- TXN_LOCK();
- /* allocate a TxLock structure */
- lid = txLockAlloc();
- tlck = lid_to_tlock(lid);
- TXN_UNLOCK();
- /* initialize linelock */
- linelock = (struct linelock *) tlck;
- linelock->next = 0;
- linelock->flag = tlckLINELOCK;
- linelock->maxcnt = TLOCKLONG;
- linelock->index = 0;
- if (tlck->flag & tlckDIRECTORY)
- linelock->flag |= tlckDIRECTORY;
- /* append linelock after tlock */
- linelock->next = tlock->next;
- tlock->next = lid;
- return linelock;
- }
- /*
- * transaction commit management
- * -----------------------------
- */
- /*
- * NAME: txCommit()
- *
- * FUNCTION: commit the changes to the objects specified in
- * clist. For journalled segments only the
- * changes of the caller are committed, ie by tid.
- * for non-journalled segments the data are flushed to
- * disk and then the change to the disk inode and indirect
- * blocks committed (so blocks newly allocated to the
- * segment will be made a part of the segment atomically).
- *
- * all of the segments specified in clist must be in
- * one file system. no more than 6 segments are needed
- * to handle all unix svcs.
- *
- * if the i_nlink field (i.e. disk inode link count)
- * is zero, and the type of inode is a regular file or
- * directory, or symbolic link , the inode is truncated
- * to zero length. the truncation is committed but the
- * VM resources are unaffected until it is closed (see
- * iput and iclose).
- *
- * PARAMETER:
- *
- * RETURN:
- *
- * serialization:
- * on entry the inode lock on each segment is assumed
- * to be held.
- *
- * i/o error:
- */
- int txCommit(tid_t tid, /* transaction identifier */
- int nip, /* number of inodes to commit */
- struct inode **iplist, /* list of inode to commit */
- int flag)
- {
- int rc = 0;
- struct commit cd;
- struct jfs_log *log;
- struct tblock *tblk;
- struct lrd *lrd;
- struct inode *ip;
- struct jfs_inode_info *jfs_ip;
- int k, n;
- ino_t top;
- struct super_block *sb;
- jfs_info("txCommit, tid = %d, flag = %d", tid, flag);
- /* is read-only file system ? */
- if (isReadOnly(iplist[0])) {
- rc = -EROFS;
- goto TheEnd;
- }
- sb = cd.sb = iplist[0]->i_sb;
- cd.tid = tid;
- if (tid == 0)
- tid = txBegin(sb, 0);
- tblk = tid_to_tblock(tid);
- /*
- * initialize commit structure
- */
- log = JFS_SBI(sb)->log;
- cd.log = log;
- /* initialize log record descriptor in commit */
- lrd = &cd.lrd;
- lrd->logtid = cpu_to_le32(tblk->logtid);
- lrd->backchain = 0;
- tblk->xflag |= flag;
- if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0)
- tblk->xflag |= COMMIT_LAZY;
- /*
- * prepare non-journaled objects for commit
- *
- * flush data pages of non-journaled file
- * to prevent the file getting non-initialized disk blocks
- * in case of crash.
- * (new blocks - )
- */
- cd.iplist = iplist;
- cd.nip = nip;
- /*
- * acquire transaction lock on (on-disk) inodes
- *
- * update on-disk inode from in-memory inode
- * acquiring transaction locks for AFTER records
- * on the on-disk inode of file object
- *
- * sort the inodes array by inode number in descending order
- * to prevent deadlock when acquiring transaction lock
- * of on-disk inodes on multiple on-disk inode pages by
- * multiple concurrent transactions
- */
- for (k = 0; k < cd.nip; k++) {
- top = (cd.iplist[k])->i_ino;
- for (n = k + 1; n < cd.nip; n++) {
- ip = cd.iplist[n];
- if (ip->i_ino > top) {
- top = ip->i_ino;
- cd.iplist[n] = cd.iplist[k];
- cd.iplist[k] = ip;
- }
- }
- ip = cd.iplist[k];
- jfs_ip = JFS_IP(ip);
- /*
- * BUGBUG - This code has temporarily been removed. The
- * intent is to ensure that any file data is written before
- * the metadata is committed to the journal. This prevents
- * uninitialized data from appearing in a file after the
- * journal has been replayed. (The uninitialized data
- * could be sensitive data removed by another user.)
- *
- * The problem now is that we are holding the IWRITELOCK
- * on the inode, and calling filemap_fdatawrite on an
- * unmapped page will cause a deadlock in jfs_get_block.
- *
- * The long term solution is to pare down the use of
- * IWRITELOCK. We are currently holding it too long.
- * We could also be smarter about which data pages need
- * to be written before the transaction is committed and
- * when we don't need to worry about it at all.
- *
- * if ((!S_ISDIR(ip->i_mode))
- * && (tblk->flag & COMMIT_DELETE) == 0)
- * filemap_write_and_wait(ip->i_mapping);
- */
- /*
- * Mark inode as not dirty. It will still be on the dirty
- * inode list, but we'll know not to commit it again unless
- * it gets marked dirty again
- */
- clear_cflag(COMMIT_Dirty, ip);
- /* inherit anonymous tlock(s) of inode */
- if (jfs_ip->atlhead) {
- lid_to_tlock(jfs_ip->atltail)->next = tblk->next;
- tblk->next = jfs_ip->atlhead;
- if (!tblk->last)
- tblk->last = jfs_ip->atltail;
- jfs_ip->atlhead = jfs_ip->atltail = 0;
- TXN_LOCK();
- list_del_init(&jfs_ip->anon_inode_list);
- TXN_UNLOCK();
- }
- /*
- * acquire transaction lock on on-disk inode page
- * (become first tlock of the tblk's tlock list)
- */
- if (((rc = diWrite(tid, ip))))
- goto out;
- }
- /*
- * write log records from transaction locks
- *
- * txUpdateMap() resets XAD_NEW in XAD.
- */
- if ((rc = txLog(log, tblk, &cd)))
- goto TheEnd;
- /*
- * Ensure that inode isn't reused before
- * lazy commit thread finishes processing
- */
- if (tblk->xflag & COMMIT_DELETE) {
- ihold(tblk->u.ip);
- /*
- * Avoid a rare deadlock
- *
- * If the inode is locked, we may be blocked in
- * jfs_commit_inode. If so, we don't want the
- * lazy_commit thread doing the last iput() on the inode
- * since that may block on the locked inode. Instead,
- * commit the transaction synchronously, so the last iput
- * will be done by the calling thread (or later)
- */
- /*
- * I believe this code is no longer needed. Splitting I_LOCK
- * into two bits, I_NEW and I_SYNC should prevent this
- * deadlock as well. But since I don't have a JFS testload
- * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
- * Joern
- */
- if (tblk->u.ip->i_state & I_SYNC)
- tblk->xflag &= ~COMMIT_LAZY;
- }
- ASSERT((!(tblk->xflag & COMMIT_DELETE)) ||
- ((tblk->u.ip->i_nlink == 0) &&
- !test_cflag(COMMIT_Nolink, tblk->u.ip)));
- /*
- * write COMMIT log record
- */
- lrd->type = cpu_to_le16(LOG_COMMIT);
- lrd->length = 0;
- lmLog(log, tblk, lrd, NULL);
- lmGroupCommit(log, tblk);
- /*
- * - transaction is now committed -
- */
- /*
- * force pages in careful update
- * (imap addressing structure update)
- */
- if (flag & COMMIT_FORCE)
- txForce(tblk);
- /*
- * update allocation map.
- *
- * update inode allocation map and inode:
- * free pager lock on memory object of inode if any.
- * update block allocation map.
- *
- * txUpdateMap() resets XAD_NEW in XAD.
- */
- if (tblk->xflag & COMMIT_FORCE)
- txUpdateMap(tblk);
- /*
- * free transaction locks and pageout/free pages
- */
- txRelease(tblk);
- if ((tblk->flag & tblkGC_LAZY) == 0)
- txUnlock(tblk);
- /*
- * reset in-memory object state
- */
- for (k = 0; k < cd.nip; k++) {
- ip = cd.iplist[k];
- jfs_ip = JFS_IP(ip);
- /*
- * reset in-memory inode state
- */
- jfs_ip->bxflag = 0;
- jfs_ip->blid = 0;
- }
- out:
- if (rc != 0)
- txAbort(tid, 1);
- TheEnd:
- jfs_info("txCommit: tid = %d, returning %d", tid, rc);
- return rc;
- }
- /*
- * NAME: txLog()
- *
- * FUNCTION: Writes AFTER log records for all lines modified
- * by tid for segments specified by inodes in comdata.
- * Code assumes only WRITELOCKS are recorded in lockwords.
- *
- * PARAMETERS:
- *
- * RETURN :
- */
- static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
- {
- int rc = 0;
- struct inode *ip;
- lid_t lid;
- struct tlock *tlck;
- struct lrd *lrd = &cd->lrd;
- /*
- * write log record(s) for each tlock of transaction,
- */
- for (lid = tblk->next; lid; lid = tlck->next) {
- tlck = lid_to_tlock(lid);
- tlck->flag |= tlckLOG;
- /* initialize lrd common */
- ip = tlck->ip;
- lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate);
- lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset);
- lrd->log.redopage.inode = cpu_to_le32(ip->i_ino);
- /* write log record of page from the tlock */
- switch (tlck->type & tlckTYPE) {
- case tlckXTREE:
- xtLog(log, tblk, lrd, tlck);
- break;
- case tlckDTREE:
- dtLog(log, tblk, lrd, tlck);
- break;
- case tlckINODE:
- diLog(log, tblk, lrd, tlck, cd);
- break;
- case tlckMAP:
- mapLog(log, tblk, lrd, tlck);
- break;
- case tlckDATA:
- dataLog(log, tblk, lrd, tlck);
- break;
- default:
- jfs_err("UFO tlock:0x%p", tlck);
- }
- }
- return rc;
- }
- /*
- * diLog()
- *
- * function: log inode tlock and format maplock to update bmap;
- */
- static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck, struct commit * cd)
- {
- int rc = 0;
- struct metapage *mp;
- pxd_t *pxd;
- struct pxd_lock *pxdlock;
- mp = tlck->mp;
- /* initialize as REDOPAGE record format */
- lrd->log.redopage.type = cpu_to_le16(LOG_INODE);
- lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE);
- pxd = &lrd->log.redopage.pxd;
- /*
- * inode after image
- */
- if (tlck->type & tlckENTRY) {
- /* log after-image for logredo(): */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- PXDaddress(pxd, mp->index);
- PXDlength(pxd,
- mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- } else if (tlck->type & tlckFREE) {
- /*
- * free inode extent
- *
- * (pages of the freed inode extent have been invalidated and
- * a maplock for free of the extent has been formatted at
- * txLock() time);
- *
- * the tlock had been acquired on the inode allocation map page
- * (iag) that specifies the freed extent, even though the map
- * page is not itself logged, to prevent pageout of the map
- * page before the log;
- */
- /* log LOG_NOREDOINOEXT of the freed inode extent for
- * logredo() to start NoRedoPage filters, and to update
- * imap and bmap for free of the extent;
- */
- lrd->type = cpu_to_le16(LOG_NOREDOINOEXT);
- /*
- * For the LOG_NOREDOINOEXT record, we need
- * to pass the IAG number and inode extent
- * index (within that IAG) from which the
- * the extent being released. These have been
- * passed to us in the iplist[1] and iplist[2].
- */
- lrd->log.noredoinoext.iagnum =
- cpu_to_le32((u32) (size_t) cd->iplist[1]);
- lrd->log.noredoinoext.inoext_idx =
- cpu_to_le32((u32) (size_t) cd->iplist[2]);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- *pxd = pxdlock->pxd;
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- /* update bmap */
- tlck->flag |= tlckUPDATEMAP;
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- } else
- jfs_err("diLog: UFO type tlck:0x%p", tlck);
- #ifdef _JFS_WIP
- /*
- * alloc/free external EA extent
- *
- * a maplock for txUpdateMap() to update bPWMAP for alloc/free
- * of the extent has been formatted at txLock() time;
- */
- else {
- assert(tlck->type & tlckEA);
- /* log LOG_UPDATEMAP for logredo() to update bmap for
- * alloc of new (and free of old) external EA extent;
- */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- nlock = pxdlock->index;
- for (i = 0; i < nlock; i++, pxdlock++) {
- if (pxdlock->flag & mlckALLOCPXD)
- lrd->log.updatemap.type =
- cpu_to_le16(LOG_ALLOCPXD);
- else
- lrd->log.updatemap.type =
- cpu_to_le16(LOG_FREEPXD);
- lrd->log.updatemap.nxd = cpu_to_le16(1);
- lrd->log.updatemap.pxd = pxdlock->pxd;
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- }
- /* update bmap */
- tlck->flag |= tlckUPDATEMAP;
- }
- #endif /* _JFS_WIP */
- return rc;
- }
- /*
- * dataLog()
- *
- * function: log data tlock
- */
- static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck)
- {
- struct metapage *mp;
- pxd_t *pxd;
- mp = tlck->mp;
- /* initialize as REDOPAGE record format */
- lrd->log.redopage.type = cpu_to_le16(LOG_DATA);
- lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE);
- pxd = &lrd->log.redopage.pxd;
- /* log after-image for logredo(): */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- if (jfs_dirtable_inline(tlck->ip)) {
- /*
- * The table has been truncated, we've must have deleted
- * the last entry, so don't bother logging this
- */
- mp->lid = 0;
- grab_metapage(mp);
- metapage_homeok(mp);
- discard_metapage(mp);
- tlck->mp = NULL;
- return 0;
- }
- PXDaddress(pxd, mp->index);
- PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- return 0;
- }
- /*
- * dtLog()
- *
- * function: log dtree tlock and format maplock to update bmap;
- */
- static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck)
- {
- struct metapage *mp;
- struct pxd_lock *pxdlock;
- pxd_t *pxd;
- mp = tlck->mp;
- /* initialize as REDOPAGE/NOREDOPAGE record format */
- lrd->log.redopage.type = cpu_to_le16(LOG_DTREE);
- lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE);
- pxd = &lrd->log.redopage.pxd;
- if (tlck->type & tlckBTROOT)
- lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
- /*
- * page extension via relocation: entry insertion;
- * page extension in-place: entry insertion;
- * new right page from page split, reinitialized in-line
- * root from root page split: entry insertion;
- */
- if (tlck->type & (tlckNEW | tlckEXTEND)) {
- /* log after-image of the new page for logredo():
- * mark log (LOG_NEW) for logredo() to initialize
- * freelist and update bmap for alloc of the new page;
- */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- if (tlck->type & tlckEXTEND)
- lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND);
- else
- lrd->log.redopage.type |= cpu_to_le16(LOG_NEW);
- PXDaddress(pxd, mp->index);
- PXDlength(pxd,
- mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* format a maplock for txUpdateMap() to update bPMAP for
- * alloc of the new page;
- */
- if (tlck->type & tlckBTROOT)
- return;
- tlck->flag |= tlckUPDATEMAP;
- pxdlock = (struct pxd_lock *) & tlck->lock;
- pxdlock->flag = mlckALLOCPXD;
- pxdlock->pxd = *pxd;
- pxdlock->index = 1;
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- return;
- }
- /*
- * entry insertion/deletion,
- * sibling page link update (old right page before split);
- */
- if (tlck->type & (tlckENTRY | tlckRELINK)) {
- /* log after-image for logredo(): */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- PXDaddress(pxd, mp->index);
- PXDlength(pxd,
- mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- return;
- }
- /*
- * page deletion: page has been invalidated
- * page relocation: source extent
- *
- * a maplock for free of the page has been formatted
- * at txLock() time);
- */
- if (tlck->type & (tlckFREE | tlckRELOCATE)) {
- /* log LOG_NOREDOPAGE of the deleted page for logredo()
- * to start NoRedoPage filter and to update bmap for free
- * of the deletd page
- */
- lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- *pxd = pxdlock->pxd;
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- /* a maplock for txUpdateMap() for free of the page
- * has been formatted at txLock() time;
- */
- tlck->flag |= tlckUPDATEMAP;
- }
- return;
- }
- /*
- * xtLog()
- *
- * function: log xtree tlock and format maplock to update bmap;
- */
- static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck)
- {
- struct inode *ip;
- struct metapage *mp;
- xtpage_t *p;
- struct xtlock *xtlck;
- struct maplock *maplock;
- struct xdlistlock *xadlock;
- struct pxd_lock *pxdlock;
- pxd_t *page_pxd;
- int next, lwm, hwm;
- ip = tlck->ip;
- mp = tlck->mp;
- /* initialize as REDOPAGE/NOREDOPAGE record format */
- lrd->log.redopage.type = cpu_to_le16(LOG_XTREE);
- lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE);
- page_pxd = &lrd->log.redopage.pxd;
- if (tlck->type & tlckBTROOT) {
- lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
- p = &JFS_IP(ip)->i_xtroot;
- if (S_ISDIR(ip->i_mode))
- lrd->log.redopage.type |=
- cpu_to_le16(LOG_DIR_XTREE);
- } else
- p = (xtpage_t *) mp->data;
- next = le16_to_cpu(p->header.nextindex);
- xtlck = (struct xtlock *) & tlck->lock;
- maplock = (struct maplock *) & tlck->lock;
- xadlock = (struct xdlistlock *) maplock;
- /*
- * entry insertion/extension;
- * sibling page link update (old right page before split);
- */
- if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) {
- /* log after-image for logredo():
- * logredo() will update bmap for alloc of new/extended
- * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
- * after-image of XADlist;
- * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
- * applying the after-image to the meta-data page.
- */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- PXDaddress(page_pxd, mp->index);
- PXDlength(page_pxd,
- mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* format a maplock for txUpdateMap() to update bPMAP
- * for alloc of new/extended extents of XAD[lwm:next)
- * from the page itself;
- * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
- */
- lwm = xtlck->lwm.offset;
- if (lwm == 0)
- lwm = XTPAGEMAXSLOT;
- if (lwm == next)
- goto out;
- if (lwm > next) {
- jfs_err("xtLog: lwm > next\n");
- goto out;
- }
- tlck->flag |= tlckUPDATEMAP;
- xadlock->flag = mlckALLOCXADLIST;
- xadlock->count = next - lwm;
- if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
- int i;
- pxd_t *pxd;
- /*
- * Lazy commit may allow xtree to be modified before
- * txUpdateMap runs. Copy xad into linelock to
- * preserve correct data.
- *
- * We can fit twice as may pxd's as xads in the lock
- */
- xadlock->flag = mlckALLOCPXDLIST;
- pxd = xadlock->xdlist = &xtlck->pxdlock;
- for (i = 0; i < xadlock->count; i++) {
- PXDaddress(pxd, addressXAD(&p->xad[lwm + i]));
- PXDlength(pxd, lengthXAD(&p->xad[lwm + i]));
- p->xad[lwm + i].flag &=
- ~(XAD_NEW | XAD_EXTENDED);
- pxd++;
- }
- } else {
- /*
- * xdlist will point to into inode's xtree, ensure
- * that transaction is not committed lazily.
- */
- xadlock->flag = mlckALLOCXADLIST;
- xadlock->xdlist = &p->xad[lwm];
- tblk->xflag &= ~COMMIT_LAZY;
- }
- jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d "
- "count:%d", tlck->ip, mp, tlck, lwm, xadlock->count);
- maplock->index = 1;
- out:
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- return;
- }
- /*
- * page deletion: file deletion/truncation (ref. xtTruncate())
- *
- * (page will be invalidated after log is written and bmap
- * is updated from the page);
- */
- if (tlck->type & tlckFREE) {
- /* LOG_NOREDOPAGE log for NoRedoPage filter:
- * if page free from file delete, NoRedoFile filter from
- * inode image of zero link count will subsume NoRedoPage
- * filters for each page;
- * if page free from file truncattion, write NoRedoPage
- * filter;
- *
- * upadte of block allocation map for the page itself:
- * if page free from deletion and truncation, LOG_UPDATEMAP
- * log for the page itself is generated from processing
- * its parent page xad entries;
- */
- /* if page free from file truncation, log LOG_NOREDOPAGE
- * of the deleted page for logredo() to start NoRedoPage
- * filter for the page;
- */
- if (tblk->xflag & COMMIT_TRUNCATE) {
- /* write NOREDOPAGE for the page */
- lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
- PXDaddress(page_pxd, mp->index);
- PXDlength(page_pxd,
- mp->logical_size >> tblk->sb->
- s_blocksize_bits);
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- if (tlck->type & tlckBTROOT) {
- /* Empty xtree must be logged */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- }
- }
- /* init LOG_UPDATEMAP of the freed extents
- * XAD[XTENTRYSTART:hwm) from the deleted page itself
- * for logredo() to update bmap;
- */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- lrd->log.updatemap.type = cpu_to_le16(LOG_FREEXADLIST);
- xtlck = (struct xtlock *) & tlck->lock;
- hwm = xtlck->hwm.offset;
- lrd->log.updatemap.nxd =
- cpu_to_le16(hwm - XTENTRYSTART + 1);
- /* reformat linelock for lmLog() */
- xtlck->header.offset = XTENTRYSTART;
- xtlck->header.length = hwm - XTENTRYSTART + 1;
- xtlck->index = 1;
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /* format a maplock for txUpdateMap() to update bmap
- * to free extents of XAD[XTENTRYSTART:hwm) from the
- * deleted page itself;
- */
- tlck->flag |= tlckUPDATEMAP;
- xadlock->count = hwm - XTENTRYSTART + 1;
- if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
- int i;
- pxd_t *pxd;
- /*
- * Lazy commit may allow xtree to be modified before
- * txUpdateMap runs. Copy xad into linelock to
- * preserve correct data.
- *
- * We can fit twice as may pxd's as xads in the lock
- */
- xadlock->flag = mlckFREEPXDLIST;
- pxd = xadlock->xdlist = &xtlck->pxdlock;
- for (i = 0; i < xadlock->count; i++) {
- PXDaddress(pxd,
- addressXAD(&p->xad[XTENTRYSTART + i]));
- PXDlength(pxd,
- lengthXAD(&p->xad[XTENTRYSTART + i]));
- pxd++;
- }
- } else {
- /*
- * xdlist will point to into inode's xtree, ensure
- * that transaction is not committed lazily.
- */
- xadlock->flag = mlckFREEXADLIST;
- xadlock->xdlist = &p->xad[XTENTRYSTART];
- tblk->xflag &= ~COMMIT_LAZY;
- }
- jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2",
- tlck->ip, mp, xadlock->count);
- maplock->index = 1;
- /* mark page as invalid */
- if (((tblk->xflag & COMMIT_PWMAP) || S_ISDIR(ip->i_mode))
- && !(tlck->type & tlckBTROOT))
- tlck->flag |= tlckFREEPAGE;
- /*
- else (tblk->xflag & COMMIT_PMAP)
- ? release the page;
- */
- return;
- }
- /*
- * page/entry truncation: file truncation (ref. xtTruncate())
- *
- * |----------+------+------+---------------|
- * | | |
- * | | hwm - hwm before truncation
- * | next - truncation point
- * lwm - lwm before truncation
- * header ?
- */
- if (tlck->type & tlckTRUNCATE) {
- /* This odd declaration suppresses a bogus gcc warning */
- pxd_t pxd = pxd; /* truncated extent of xad */
- int twm;
- /*
- * For truncation the entire linelock may be used, so it would
- * be difficult to store xad list in linelock itself.
- * Therefore, we'll just force transaction to be committed
- * synchronously, so that xtree pages won't be changed before
- * txUpdateMap runs.
- */
- tblk->xflag &= ~COMMIT_LAZY;
- lwm = xtlck->lwm.offset;
- if (lwm == 0)
- lwm = XTPAGEMAXSLOT;
- hwm = xtlck->hwm.offset;
- twm = xtlck->twm.offset;
- /*
- * write log records
- */
- /* log after-image for logredo():
- *
- * logredo() will update bmap for alloc of new/extended
- * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
- * after-image of XADlist;
- * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
- * applying the after-image to the meta-data page.
- */
- lrd->type = cpu_to_le16(LOG_REDOPAGE);
- PXDaddress(page_pxd, mp->index);
- PXDlength(page_pxd,
- mp->logical_size >> tblk->sb->s_blocksize_bits);
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- /*
- * truncate entry XAD[twm == next - 1]:
- */
- if (twm == next - 1) {
- /* init LOG_UPDATEMAP for logredo() to update bmap for
- * free of truncated delta extent of the truncated
- * entry XAD[next - 1]:
- * (xtlck->pxdlock = truncated delta extent);
- */
- pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
- /* assert(pxdlock->type & tlckTRUNCATE); */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
- lrd->log.updatemap.nxd = cpu_to_le16(1);
- lrd->log.updatemap.pxd = pxdlock->pxd;
- pxd = pxdlock->pxd; /* save to format maplock */
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- }
- /*
- * free entries XAD[next:hwm]:
- */
- if (hwm >= next) {
- /* init LOG_UPDATEMAP of the freed extents
- * XAD[next:hwm] from the deleted page itself
- * for logredo() to update bmap;
- */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- lrd->log.updatemap.type =
- cpu_to_le16(LOG_FREEXADLIST);
- xtlck = (struct xtlock *) & tlck->lock;
- hwm = xtlck->hwm.offset;
- lrd->log.updatemap.nxd =
- cpu_to_le16(hwm - next + 1);
- /* reformat linelock for lmLog() */
- xtlck->header.offset = next;
- xtlck->header.length = hwm - next + 1;
- xtlck->index = 1;
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, tlck));
- }
- /*
- * format maplock(s) for txUpdateMap() to update bmap
- */
- maplock->index = 0;
- /*
- * allocate entries XAD[lwm:next):
- */
- if (lwm < next) {
- /* format a maplock for txUpdateMap() to update bPMAP
- * for alloc of new/extended extents of XAD[lwm:next)
- * from the page itself;
- * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
- */
- tlck->flag |= tlckUPDATEMAP;
- xadlock->flag = mlckALLOCXADLIST;
- xadlock->count = next - lwm;
- xadlock->xdlist = &p->xad[lwm];
- jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d "
- "lwm:%d next:%d",
- tlck->ip, mp, xadlock->count, lwm, next);
- maplock->index++;
- xadlock++;
- }
- /*
- * truncate entry XAD[twm == next - 1]:
- */
- if (twm == next - 1) {
- /* format a maplock for txUpdateMap() to update bmap
- * to free truncated delta extent of the truncated
- * entry XAD[next - 1];
- * (xtlck->pxdlock = truncated delta extent);
- */
- tlck->flag |= tlckUPDATEMAP;
- pxdlock = (struct pxd_lock *) xadlock;
- pxdlock->flag = mlckFREEPXD;
- pxdlock->count = 1;
- pxdlock->pxd = pxd;
- jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d "
- "hwm:%d", ip, mp, pxdlock->count, hwm);
- maplock->index++;
- xadlock++;
- }
- /*
- * free entries XAD[next:hwm]:
- */
- if (hwm >= next) {
- /* format a maplock for txUpdateMap() to update bmap
- * to free extents of XAD[next:hwm] from thedeleted
- * page itself;
- */
- tlck->flag |= tlckUPDATEMAP;
- xadlock->flag = mlckFREEXADLIST;
- xadlock->count = hwm - next + 1;
- xadlock->xdlist = &p->xad[next];
- jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d "
- "next:%d hwm:%d",
- tlck->ip, mp, xadlock->count, next, hwm);
- maplock->index++;
- }
- /* mark page as homeward bound */
- tlck->flag |= tlckWRITEPAGE;
- }
- return;
- }
- /*
- * mapLog()
- *
- * function: log from maplock of freed data extents;
- */
- static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
- struct tlock * tlck)
- {
- struct pxd_lock *pxdlock;
- int i, nlock;
- pxd_t *pxd;
- /*
- * page relocation: free the source page extent
- *
- * a maplock for txUpdateMap() for free of the page
- * has been formatted at txLock() time saving the src
- * relocated page address;
- */
- if (tlck->type & tlckRELOCATE) {
- /* log LOG_NOREDOPAGE of the old relocated page
- * for logredo() to start NoRedoPage filter;
- */
- lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- pxd = &lrd->log.redopage.pxd;
- *pxd = pxdlock->pxd;
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- /* (N.B. currently, logredo() does NOT update bmap
- * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
- * if page free from relocation, LOG_UPDATEMAP log is
- * specifically generated now for logredo()
- * to update bmap for free of src relocated page;
- * (new flag LOG_RELOCATE may be introduced which will
- * inform logredo() to start NORedoPage filter and also
- * update block allocation map at the same time, thus
- * avoiding an extra log write);
- */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
- lrd->log.updatemap.nxd = cpu_to_le16(1);
- lrd->log.updatemap.pxd = pxdlock->pxd;
- lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- /* a maplock for txUpdateMap() for free of the page
- * has been formatted at txLock() time;
- */
- tlck->flag |= tlckUPDATEMAP;
- return;
- }
- /*
- * Otherwise it's not a relocate request
- *
- */
- else {
- /* log LOG_UPDATEMAP for logredo() to update bmap for
- * free of truncated/relocated delta extent of the data;
- * e.g.: external EA extent, relocated/truncated extent
- * from xtTailgate();
- */
- lrd->type = cpu_to_le16(LOG_UPDATEMAP);
- pxdlock = (struct pxd_lock *) & tlck->lock;
- nlock = pxdlock->index;
- for (i = 0; i < nlock; i++, pxdlock++) {
- if (pxdlock->flag & mlckALLOCPXD)
- lrd->log.updatemap.type =
- cpu_to_le16(LOG_ALLOCPXD);
- else
- lrd->log.updatemap.type =
- cpu_to_le16(LOG_FREEPXD);
- lrd->log.updatemap.nxd = cpu_to_le16(1);
- lrd->log.updatemap.pxd = pxdlock->pxd;
- lrd->backchain =
- cpu_to_le32(lmLog(log, tblk, lrd, NULL));
- jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
- (ulong) addressPXD(&pxdlock->pxd),
- lengthPXD(&pxdlock->pxd));
- }
- /* update bmap */
- tlck->flag |= tlckUPDATEMAP;
- }
- }
- /*
- * txEA()
- *
- * function: acquire maplock for EA/ACL extents or
- * set COMMIT_INLINE flag;
- */
- void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea)
- {
- struct tlock *tlck = NULL;
- struct pxd_lock *maplock = NULL, *pxdlock = NULL;
- /*
- * format maplock for alloc of new EA extent
- */
- if (newea) {
- /* Since the newea could be a completely zeroed entry we need to
- * check for the two flags which indicate we should actually
- * commit new EA data
- */
- if (newea->flag & DXD_EXTENT) {
- tlck = txMaplock(tid, ip, tlckMAP);
- maplock = (struct pxd_lock *) & tlck->lock;
- pxdlock = (struct pxd_lock *) maplock;
- pxdlock->flag = mlckALLOCPXD;
- PXDaddress(&pxdlock->pxd, addressDXD(newea));
- PXDlength(&pxdlock->pxd, lengthDXD(newea));
- pxdlock++;
- maplock->index = 1;
- } else if (newea->flag & DXD_INLINE) {
- tlck = NULL;
- set_cflag(COMMIT_Inlineea, ip);
- }
- }
- /*
- * format maplock for free of old EA extent
- */
- if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) {
- if (tlck == NULL) {
- tlck = txMaplock(tid, ip, tlckMAP);
- maplock = (struct pxd_lock *) & tlck->lock;
- pxdlock = (struct pxd_lock *) maplock;
- maplock->index = 0;
- }
- pxdlock->flag = mlckFREEPXD;
- PXDaddress(&pxdlock->pxd, addressDXD(oldea));
- PXDlength(&pxdlock->pxd, lengthDXD(oldea));
- maplock->index++;
- }
- }
- /*
- * txForce()
- *
- * function: synchronously write pages locked by transaction
- * after txLog() but before txUpdateMap();
- */
- static void txForce(struct tblock * tblk)
- {
- struct tlock *tlck;
- lid_t lid, next;
- struct metapage *mp;
- /*
- * reverse the order of transaction tlocks in
- * careful update order of address index pages
- * (right to left, bottom up)
- */
- tlck = lid_to_tlock(tblk->next);
- lid = tlck->next;
- tlck->next = 0;
- while (lid) {
- tlck = lid_to_tlock(lid);
- next = tlck->next;
- tlck->next = tblk->next;
- tblk->next = lid;
- lid = next;
- }
- /*
- * synchronously write the page, and
- * hold the page for txUpdateMap();
- */
- for (lid = tblk->next; lid; lid = next) {
- tlck = lid_to_tlock(lid);
- next = tlck->next;
- if ((mp = tlck->mp) != NULL &&
- (tlck->type & tlckBTROOT) == 0) {
- assert(mp->xflag & COMMIT_PAGE);
- if (tlck->flag & tlckWRITEPAGE) {
- tlck->flag &= ~tlckWRITEPAGE;
- /* do not release page to freelist */
- force_metapage(mp);
- #if 0
- /*
- * The "right" thing to do here is to
- * synchronously write the metadata.
- * With the current implementation this
- * is hard since write_metapage requires
- * us to kunmap & remap the page. If we
- * have tlocks pointing into the metadata
- * pages, we don't want to do this. I think
- * we can get by with synchronously writing
- * the pages when they are released.
- */
- assert(mp->nohomeok);
- set_bit(META_dirty, &mp->flag);
- set_bit(META_sync, &mp->flag);
- #endif
- }
- }
- }
- }
- /*
- * txUpdateMap()
- *
- * function: update persistent allocation map (and working map
- * if appropriate);
- *
- * parameter:
- */
- static void txUpdateMap(struct tblock * tblk)
- {
- struct inode *ip;
- struct inode *ipimap;
- lid_t lid;
- struct tlock *tlck;
- struct maplock *maplock;
- struct pxd_lock pxdlock;
- int maptype;
- int k, nlock;
- struct metapage *mp = NULL;
- ipimap = JFS_SBI(tblk->sb)->ipimap;
- maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP;
- /*
- * update block allocation map
- *
- * update allocation state in pmap (and wmap) and
- * update lsn of the pmap page;
- */
- /*
- * scan each tlock/page of transaction for block allocation/free:
- *
- * for each tlock/page of transaction, update map.
- * ? are there tlock for pmap and pwmap at the same time ?
- */
- for (lid = tblk->next; lid; lid = tlck->next) {
- tlck = lid_to_tlock(lid);
- if ((tlck->flag & tlckUPDATEMAP) == 0)
- continue;
- if (tlck->flag & tlckFREEPAGE) {
- /*
- * Another thread may attempt to reuse freed space
- * immediately, so we want to get rid of the metapage
- * before anyone else has a chance to get it.
- * Lock metapage, update maps, then invalidate
- * the metapage.
- */
- mp = tlck->mp;
- ASSERT(mp->xflag & COMMIT_PAGE);
- grab_metapage(mp);
- }
- /*
- * extent list:
- * . in-line PXD list:
- * . out-of-line XAD list:
- */
- maplock = (struct maplock *) & tlck->lock;
- nlock = maplock->index;
- for (k = 0; k < nlock; k++, maplock++) {
- /*
- * allocate blocks in persistent map:
- *
- * blocks have been allocated from wmap at alloc time;
- */
- if (maplock->flag & mlckALLOC) {
- txAllocPMap(ipimap, maplock, tblk);
- }
- /*
- * free blocks in persistent and working map:
- * blocks will be freed in pmap and then in wmap;
- *
- * ? tblock specifies the PMAP/PWMAP based upon
- * transaction
- *
- * free blocks in persistent map:
- * blocks will be freed from wmap at last reference
- * release of the object for regular files;
- *
- * Alway free blocks from both persistent & working
- * maps for directories
- */
- else { /* (maplock->flag & mlckFREE) */
- if (tlck->flag & tlckDIRECTORY)
- txFreeMap(ipimap, maplock,
- tblk, COMMIT_PWMAP);
- else
- txFreeMap(ipimap, maplock,
- tblk, maptype);
- }
- }
- if (tlck->flag & tlckFREEPAGE) {
- if (!(tblk->flag & tblkGC_LAZY)) {
- /* This is equivalent to txRelease */
- ASSERT(mp->lid == lid);
- tlck->mp->lid = 0;
- }
- assert(mp->nohomeok == 1);
- metapage_homeok(mp);
- discard_metapage(mp);
- tlck->mp = NULL;
- }
- }
- /*
- * update inode allocation map
- *
- * update allocation state in pmap and
- * update lsn of the pmap page;
- * update in-memory inode flag/state
- *
- * unlock mapper/write lock
- */
- if (tblk->xflag & COMMIT_CREATE) {
- diUpdatePMap(ipimap, tblk->ino, false, tblk);
- /* update persistent block allocation map
- * for the allocation of inode extent;
- */
- pxdlock.flag = mlckALLOCPXD;
- pxdlock.pxd = tblk->u.ixpxd;
- pxdlock.index = 1;
- txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk);
- } else if (tblk->xflag & COMMIT_DELETE) {
- ip = tblk->u.ip;
- diUpdatePMap(ipimap, ip->i_ino, true, tblk);
- iput(ip);
- }
- }
- /*
- * txAllocPMap()
- *
- * function: allocate from persistent map;
- *
- * parameter:
- * ipbmap -
- * malock -
- * xad list:
- * pxd:
- *
- * maptype -
- * allocate from persistent map;
- * free from persistent map;
- * (e.g., tmp file - free from working map at releae
- * of last reference);
- * free from persistent and working map;
- *
- * lsn - log sequence number;
- */
- static void txAllocPMap(struct inode *ip, struct maplock * maplock,
- struct tblock * tblk)
- {
- struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
- struct xdlistlock *xadlistlock;
- xad_t *xad;
- s64 xaddr;
- int xlen;
- struct pxd_lock *pxdlock;
- struct xdlistlock *pxdlistlock;
- pxd_t *pxd;
- int n;
- /*
- * allocate from persistent map;
- */
- if (maplock->flag & mlckALLOCXADLIST) {
- xadlistlock = (struct xdlistlock *) maplock;
- xad = xadlistlock->xdlist;
- for (n = 0; n < xadlistlock->count; n++, xad++) {
- if (xad->flag & (XAD_NEW | XAD_EXTENDED)) {
- xaddr = addressXAD(xad);
- xlen = lengthXAD(xad);
- dbUpdatePMap(ipbmap, false, xaddr,
- (s64) xlen, tblk);
- xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
- jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- }
- }
- } else if (maplock->flag & mlckALLOCPXD) {
- pxdlock = (struct pxd_lock *) maplock;
- xaddr = addressPXD(&pxdlock->pxd);
- xlen = lengthPXD(&pxdlock->pxd);
- dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk);
- jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen);
- } else { /* (maplock->flag & mlckALLOCPXDLIST) */
- pxdlistlock = (struct xdlistlock *) maplock;
- pxd = pxdlistlock->xdlist;
- for (n = 0; n < pxdlistlock->count; n++, pxd++) {
- xaddr = addressPXD(pxd);
- xlen = lengthPXD(pxd);
- dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen,
- tblk);
- jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- }
- }
- }
- /*
- * txFreeMap()
- *
- * function: free from persistent and/or working map;
- *
- * todo: optimization
- */
- void txFreeMap(struct inode *ip,
- struct maplock * maplock, struct tblock * tblk, int maptype)
- {
- struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
- struct xdlistlock *xadlistlock;
- xad_t *xad;
- s64 xaddr;
- int xlen;
- struct pxd_lock *pxdlock;
- struct xdlistlock *pxdlistlock;
- pxd_t *pxd;
- int n;
- jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
- tblk, maplock, maptype);
- /*
- * free from persistent map;
- */
- if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) {
- if (maplock->flag & mlckFREEXADLIST) {
- xadlistlock = (struct xdlistlock *) maplock;
- xad = xadlistlock->xdlist;
- for (n = 0; n < xadlistlock->count; n++, xad++) {
- if (!(xad->flag & XAD_NEW)) {
- xaddr = addressXAD(xad);
- xlen = lengthXAD(xad);
- dbUpdatePMap(ipbmap, true, xaddr,
- (s64) xlen, tblk);
- jfs_info("freePMap: xaddr:0x%lx "
- "xlen:%d",
- (ulong) xaddr, xlen);
- }
- }
- } else if (maplock->flag & mlckFREEPXD) {
- pxdlock = (struct pxd_lock *) maplock;
- xaddr = addressPXD(&pxdlock->pxd);
- xlen = lengthPXD(&pxdlock->pxd);
- dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen,
- tblk);
- jfs_info("freePMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- } else { /* (maplock->flag & mlckALLOCPXDLIST) */
- pxdlistlock = (struct xdlistlock *) maplock;
- pxd = pxdlistlock->xdlist;
- for (n = 0; n < pxdlistlock->count; n++, pxd++) {
- xaddr = addressPXD(pxd);
- xlen = lengthPXD(pxd);
- dbUpdatePMap(ipbmap, true, xaddr,
- (s64) xlen, tblk);
- jfs_info("freePMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- }
- }
- }
- /*
- * free from working map;
- */
- if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) {
- if (maplock->flag & mlckFREEXADLIST) {
- xadlistlock = (struct xdlistlock *) maplock;
- xad = xadlistlock->xdlist;
- for (n = 0; n < xadlistlock->count; n++, xad++) {
- xaddr = addressXAD(xad);
- xlen = lengthXAD(xad);
- dbFree(ip, xaddr, (s64) xlen);
- xad->flag = 0;
- jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- }
- } else if (maplock->flag & mlckFREEPXD) {
- pxdlock = (struct pxd_lock *) maplock;
- xaddr = addressPXD(&pxdlock->pxd);
- xlen = lengthPXD(&pxdlock->pxd);
- dbFree(ip, xaddr, (s64) xlen);
- jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- } else { /* (maplock->flag & mlckFREEPXDLIST) */
- pxdlistlock = (struct xdlistlock *) maplock;
- pxd = pxdlistlock->xdlist;
- for (n = 0; n < pxdlistlock->count; n++, pxd++) {
- xaddr = addressPXD(pxd);
- xlen = lengthPXD(pxd);
- dbFree(ip, xaddr, (s64) xlen);
- jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
- (ulong) xaddr, xlen);
- }
- }
- }
- }
- /*
- * txFreelock()
- *
- * function: remove tlock from inode anonymous locklist
- */
- void txFreelock(struct inode *ip)
- {
- struct jfs_inode_info *jfs_ip = JFS_IP(ip);
- struct tlock *xtlck, *tlck;
- lid_t xlid = 0, lid;
- if (!jfs_ip->atlhead)
- return;
- TXN_LOCK();
- xtlck = (struct tlock *) &jfs_ip->atlhead;
- while ((lid = xtlck->next) != 0) {
- tlck = lid_to_tlock(lid);
- if (tlck->flag & tlckFREELOCK) {
- xtlck->next = tlck->next;
- txLockFree(lid);
- } else {
- xtlck = tlck;
- xlid = lid;
- }
- }
- if (jfs_ip->atlhead)
- jfs_ip->atltail = xlid;
- else {
- jfs_ip->atltail = 0;
- /*
- * If inode was on anon_list, remove it
- */
- list_del_init(&jfs_ip->anon_inode_list);
- }
- TXN_UNLOCK();
- }
- /*
- * txAbort()
- *
- * function: abort tx before commit;
- *
- * frees line-locks and segment locks for all
- * segments in comdata structure.
- * Optionally sets state of file-system to FM_DIRTY in super-block.
- * log age of page-frames in memory for which caller has
- * are reset to 0 (to avoid logwarap).
- */
- void txAbort(tid_t tid, int dirty)
- {
- lid_t lid, next;
- struct metapage *mp;
- struct tblock *tblk = tid_to_tblock(tid);
- struct tlock *tlck;
- /*
- * free tlocks of the transaction
- */
- for (lid = tblk->next; lid; lid = next) {
- tlck = lid_to_tlock(lid);
- next = tlck->next;
- mp = tlck->mp;
- JFS_IP(tlck->ip)->xtlid = 0;
- if (mp) {
- mp->lid = 0;
- /*
- * reset lsn of page to avoid logwarap:
- *
- * (page may have been previously committed by another
- * transaction(s) but has not been paged, i.e.,
- * it may be on logsync list even though it has not
- * been logged for the current tx.)
- */
- if (mp->xflag & COMMIT_PAGE && mp->lsn)
- LogSyncRelease(mp);
- }
- /* insert tlock at head of freelist */
- TXN_LOCK();
- txLockFree(lid);
- TXN_UNLOCK();
- }
- /* caller will free the transaction block */
- tblk->next = tblk->last = 0;
- /*
- * mark filesystem dirty
- */
- if (dirty)
- jfs_error(tblk->sb, "\n");
- return;
- }
- /*
- * txLazyCommit(void)
- *
- * All transactions except those changing ipimap (COMMIT_FORCE) are
- * processed by this routine. This insures that the inode and block
- * allocation maps are updated in order. For synchronous transactions,
- * let the user thread finish processing after txUpdateMap() is called.
- */
- static void txLazyCommit(struct tblock * tblk)
- {
- struct jfs_log *log;
- while (((tblk->flag & tblkGC_READY) == 0) &&
- ((tblk->flag & tblkGC_UNLOCKED) == 0)) {
- /* We must have gotten ahead of the user thread
- */
- jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk);
- yield();
- }
- jfs_info("txLazyCommit: processing tblk 0x%p", tblk);
- txUpdateMap(tblk);
- log = (struct jfs_log *) JFS_SBI(tblk->sb)->log;
- spin_lock_irq(&log->gclock); // LOGGC_LOCK
- tblk->flag |= tblkGC_COMMITTED;
- if (tblk->flag & tblkGC_READY)
- log->gcrtc--;
- wake_up_all(&tblk->gcwait); // LOGGC_WAKEUP
- /*
- * Can't release log->gclock until we've tested tblk->flag
- */
- if (tblk->flag & tblkGC_LAZY) {
- spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
- txUnlock(tblk);
- tblk->flag &= ~tblkGC_LAZY;
- txEnd(tblk - TxBlock); /* Convert back to tid */
- } else
- spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
- jfs_info("txLazyCommit: done: tblk = 0x%p", tblk);
- }
- /*
- * jfs_lazycommit(void)
- *
- * To be run as a kernel daemon. If lbmIODone is called in an interrupt
- * context, or where blocking is not wanted, this routine will process
- * committed transactions from the unlock queue.
- */
- int jfs_lazycommit(void *arg)
- {
- int WorkDone;
- struct tblock *tblk;
- unsigned long flags;
- struct jfs_sb_info *sbi;
- do {
- LAZY_LOCK(flags);
- jfs_commit_thread_waking = 0; /* OK to wake another thread */
- while (!list_empty(&TxAnchor.unlock_queue)) {
- WorkDone = 0;
- list_for_each_entry(tblk, &TxAnchor.unlock_queue,
- cqueue) {
- sbi = JFS_SBI(tblk->sb);
- /*
- * For each volume, the transactions must be
- * handled in order. If another commit thread
- * is handling a tblk for this superblock,
- * skip it
- */
- if (sbi->commit_state & IN_LAZYCOMMIT)
- continue;
- sbi->commit_state |= IN_LAZYCOMMIT;
- WorkDone = 1;
- /*
- * Remove transaction from queue
- */
- list_del(&tblk->cqueue);
- LAZY_UNLOCK(flags);
- txLazyCommit(tblk);
- LAZY_LOCK(flags);
- sbi->commit_state &= ~IN_LAZYCOMMIT;
- /*
- * Don't continue in the for loop. (We can't
- * anyway, it's unsafe!) We want to go back to
- * the beginning of the list.
- */
- break;
- }
- /* If there was nothing to do, don't continue */
- if (!WorkDone)
- break;
- }
- /* In case a wakeup came while all threads were active */
- jfs_commit_thread_waking = 0;
- if (freezing(current)) {
- LAZY_UNLOCK(flags);
- try_to_freeze();
- } else {
- DECLARE_WAITQUEUE(wq, current);
- add_wait_queue(&jfs_commit_thread_wait, &wq);
- set_current_state(TASK_INTERRUPTIBLE);
- LAZY_UNLOCK(flags);
- schedule();
- remove_wait_queue(&jfs_commit_thread_wait, &wq);
- }
- } while (!kthread_should_stop());
- if (!list_empty(&TxAnchor.unlock_queue))
- jfs_err("jfs_lazycommit being killed w/pending transactions!");
- else
- jfs_info("jfs_lazycommit being killed\n");
- return 0;
- }
- void txLazyUnlock(struct tblock * tblk)
- {
- unsigned long flags;
- LAZY_LOCK(flags);
- list_add_tail(&tblk->cqueue, &TxAnchor.unlock_queue);
- /*
- * Don't wake up a commit thread if there is already one servicing
- * this superblock, or if the last one we woke up hasn't started yet.
- */
- if (!(JFS_SBI(tblk->sb)->commit_state & IN_LAZYCOMMIT) &&
- !jfs_commit_thread_waking) {
- jfs_commit_thread_waking = 1;
- wake_up(&jfs_commit_thread_wait);
- }
- LAZY_UNLOCK(flags);
- }
- static void LogSyncRelease(struct metapage * mp)
- {
- struct jfs_log *log = mp->log;
- assert(mp->nohomeok);
- assert(log);
- metapage_homeok(mp);
- }
- /*
- * txQuiesce
- *
- * Block all new transactions and push anonymous transactions to
- * completion
- *
- * This does almost the same thing as jfs_sync below. We don't
- * worry about deadlocking when jfs_tlocks_low is set, since we would
- * expect jfs_sync to get us out of that jam.
- */
- void txQuiesce(struct super_block *sb)
- {
- struct inode *ip;
- struct jfs_inode_info *jfs_ip;
- struct jfs_log *log = JFS_SBI(sb)->log;
- tid_t tid;
- set_bit(log_QUIESCE, &log->flag);
- TXN_LOCK();
- restart:
- while (!list_empty(&TxAnchor.anon_list)) {
- jfs_ip = list_entry(TxAnchor.anon_list.next,
- struct jfs_inode_info,
- anon_inode_list);
- ip = &jfs_ip->vfs_inode;
- /*
- * inode will be removed from anonymous list
- * when it is committed
- */
- TXN_UNLOCK();
- tid = txBegin(ip->i_sb, COMMIT_INODE | COMMIT_FORCE);
- mutex_lock(&jfs_ip->commit_mutex);
- txCommit(tid, 1, &ip, 0);
- txEnd(tid);
- mutex_unlock(&jfs_ip->commit_mutex);
- /*
- * Just to be safe. I don't know how
- * long we can run without blocking
- */
- cond_resched();
- TXN_LOCK();
- }
- /*
- * If jfs_sync is running in parallel, there could be some inodes
- * on anon_list2. Let's check.
- */
- if (!list_empty(&TxAnchor.anon_list2)) {
- list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list);
- INIT_LIST_HEAD(&TxAnchor.anon_list2);
- goto restart;
- }
- TXN_UNLOCK();
- /*
- * We may need to kick off the group commit
- */
- jfs_flush_journal(log, 0);
- }
- /*
- * txResume()
- *
- * Allows transactions to start again following txQuiesce
- */
- void txResume(struct super_block *sb)
- {
- struct jfs_log *log = JFS_SBI(sb)->log;
- clear_bit(log_QUIESCE, &log->flag);
- TXN_WAKEUP(&log->syncwait);
- }
- /*
- * jfs_sync(void)
- *
- * To be run as a kernel daemon. This is awakened when tlocks run low.
- * We write any inodes that have anonymous tlocks so they will become
- * available.
- */
- int jfs_sync(void *arg)
- {
- struct inode *ip;
- struct jfs_inode_info *jfs_ip;
- tid_t tid;
- do {
- /*
- * write each inode on the anonymous inode list
- */
- TXN_LOCK();
- while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) {
- jfs_ip = list_entry(TxAnchor.anon_list.next,
- struct jfs_inode_info,
- anon_inode_list);
- ip = &jfs_ip->vfs_inode;
- if (! igrab(ip)) {
- /*
- * Inode is being freed
- */
- list_del_init(&jfs_ip->anon_inode_list);
- } else if (mutex_trylock(&jfs_ip->commit_mutex)) {
- /*
- * inode will be removed from anonymous list
- * when it is committed
- */
- TXN_UNLOCK();
- tid = txBegin(ip->i_sb, COMMIT_INODE);
- txCommit(tid, 1, &ip, 0);
- txEnd(tid);
- mutex_unlock(&jfs_ip->commit_mutex);
- iput(ip);
- /*
- * Just to be safe. I don't know how
- * long we can run without blocking
- */
- cond_resched();
- TXN_LOCK();
- } else {
- /* We can't get the commit mutex. It may
- * be held by a thread waiting for tlock's
- * so let's not block here. Save it to
- * put back on the anon_list.
- */
- /* Move from anon_list to anon_list2 */
- list_move(&jfs_ip->anon_inode_list,
- &TxAnchor.anon_list2);
- TXN_UNLOCK();
- iput(ip);
- TXN_LOCK();
- }
- }
- /* Add anon_list2 back to anon_list */
- list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
- if (freezing(current)) {
- TXN_UNLOCK();
- try_to_freeze();
- } else {
- set_current_state(TASK_INTERRUPTIBLE);
- TXN_UNLOCK();
- schedule();
- }
- } while (!kthread_should_stop());
- jfs_info("jfs_sync being killed");
- return 0;
- }
- #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
- static int jfs_txanchor_proc_show(struct seq_file *m, void *v)
- {
- char *freewait;
- char *freelockwait;
- char *lowlockwait;
- freewait =
- waitqueue_active(&TxAnchor.freewait) ? "active" : "empty";
- freelockwait =
- waitqueue_active(&TxAnchor.freelockwait) ? "active" : "empty";
- lowlockwait =
- waitqueue_active(&TxAnchor.lowlockwait) ? "active" : "empty";
- seq_printf(m,
- "JFS TxAnchor\n"
- "============\n"
- "freetid = %d\n"
- "freewait = %s\n"
- "freelock = %d\n"
- "freelockwait = %s\n"
- "lowlockwait = %s\n"
- "tlocksInUse = %d\n"
- "jfs_tlocks_low = %d\n"
- "unlock_queue is %sempty\n",
- TxAnchor.freetid,
- freewait,
- TxAnchor.freelock,
- freelockwait,
- lowlockwait,
- TxAnchor.tlocksInUse,
- jfs_tlocks_low,
- list_empty(&TxAnchor.unlock_queue) ? "" : "not ");
- return 0;
- }
- static int jfs_txanchor_proc_open(struct inode *inode, struct file *file)
- {
- return single_open(file, jfs_txanchor_proc_show, NULL);
- }
- const struct file_operations jfs_txanchor_proc_fops = {
- .owner = THIS_MODULE,
- .open = jfs_txanchor_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
- };
- #endif
- #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
- static int jfs_txstats_proc_show(struct seq_file *m, void *v)
- {
- seq_printf(m,
- "JFS TxStats\n"
- "===========\n"
- "calls to txBegin = %d\n"
- "txBegin blocked by sync barrier = %d\n"
- "txBegin blocked by tlocks low = %d\n"
- "txBegin blocked by no free tid = %d\n"
- "calls to txBeginAnon = %d\n"
- "txBeginAnon blocked by sync barrier = %d\n"
- "txBeginAnon blocked by tlocks low = %d\n"
- "calls to txLockAlloc = %d\n"
- "tLockAlloc blocked by no free lock = %d\n",
- TxStat.txBegin,
- TxStat.txBegin_barrier,
- TxStat.txBegin_lockslow,
- TxStat.txBegin_freetid,
- TxStat.txBeginAnon,
- TxStat.txBeginAnon_barrier,
- TxStat.txBeginAnon_lockslow,
- TxStat.txLockAlloc,
- TxStat.txLockAlloc_freelock);
- return 0;
- }
- static int jfs_txstats_proc_open(struct inode *inode, struct file *file)
- {
- return single_open(file, jfs_txstats_proc_show, NULL);
- }
- const struct file_operations jfs_txstats_proc_fops = {
- .owner = THIS_MODULE,
- .open = jfs_txstats_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
- };
- #endif
|