linux/fs/jfs/jfs_txnmgr.c
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   1/*
   2 *   Copyright (C) International Business Machines Corp., 2000-2005
   3 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4 *
   5 *   This program is free software;  you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 *   the GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program;  if not, write to the Free Software
  17 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 */
  19
  20/*
  21 *      jfs_txnmgr.c: transaction manager
  22 *
  23 * notes:
  24 * transaction starts with txBegin() and ends with txCommit()
  25 * or txAbort().
  26 *
  27 * tlock is acquired at the time of update;
  28 * (obviate scan at commit time for xtree and dtree)
  29 * tlock and mp points to each other;
  30 * (no hashlist for mp -> tlock).
  31 *
  32 * special cases:
  33 * tlock on in-memory inode:
  34 * in-place tlock in the in-memory inode itself;
  35 * converted to page lock by iWrite() at commit time.
  36 *
  37 * tlock during write()/mmap() under anonymous transaction (tid = 0):
  38 * transferred (?) to transaction at commit time.
  39 *
  40 * use the page itself to update allocation maps
  41 * (obviate intermediate replication of allocation/deallocation data)
  42 * hold on to mp+lock thru update of maps
  43 */
  44
  45#include <linux/fs.h>
  46#include <linux/vmalloc.h>
  47#include <linux/completion.h>
  48#include <linux/freezer.h>
  49#include <linux/module.h>
  50#include <linux/moduleparam.h>
  51#include <linux/kthread.h>
  52#include <linux/seq_file.h>
  53#include "jfs_incore.h"
  54#include "jfs_inode.h"
  55#include "jfs_filsys.h"
  56#include "jfs_metapage.h"
  57#include "jfs_dinode.h"
  58#include "jfs_imap.h"
  59#include "jfs_dmap.h"
  60#include "jfs_superblock.h"
  61#include "jfs_debug.h"
  62
  63/*
  64 *      transaction management structures
  65 */
  66static struct {
  67        int freetid;            /* index of a free tid structure */
  68        int freelock;           /* index first free lock word */
  69        wait_queue_head_t freewait;     /* eventlist of free tblock */
  70        wait_queue_head_t freelockwait; /* eventlist of free tlock */
  71        wait_queue_head_t lowlockwait;  /* eventlist of ample tlocks */
  72        int tlocksInUse;        /* Number of tlocks in use */
  73        spinlock_t LazyLock;    /* synchronize sync_queue & unlock_queue */
  74/*      struct tblock *sync_queue; * Transactions waiting for data sync */
  75        struct list_head unlock_queue;  /* Txns waiting to be released */
  76        struct list_head anon_list;     /* inodes having anonymous txns */
  77        struct list_head anon_list2;    /* inodes having anonymous txns
  78                                           that couldn't be sync'ed */
  79} TxAnchor;
  80
  81int jfs_tlocks_low;             /* Indicates low number of available tlocks */
  82
  83#ifdef CONFIG_JFS_STATISTICS
  84static struct {
  85        uint txBegin;
  86        uint txBegin_barrier;
  87        uint txBegin_lockslow;
  88        uint txBegin_freetid;
  89        uint txBeginAnon;
  90        uint txBeginAnon_barrier;
  91        uint txBeginAnon_lockslow;
  92        uint txLockAlloc;
  93        uint txLockAlloc_freelock;
  94} TxStat;
  95#endif
  96
  97static int nTxBlock = -1;       /* number of transaction blocks */
  98module_param(nTxBlock, int, 0);
  99MODULE_PARM_DESC(nTxBlock,
 100                 "Number of transaction blocks (max:65536)");
 101
 102static int nTxLock = -1;        /* number of transaction locks */
 103module_param(nTxLock, int, 0);
 104MODULE_PARM_DESC(nTxLock,
 105                 "Number of transaction locks (max:65536)");
 106
 107struct tblock *TxBlock; /* transaction block table */
 108static int TxLockLWM;   /* Low water mark for number of txLocks used */
 109static int TxLockHWM;   /* High water mark for number of txLocks used */
 110static int TxLockVHWM;  /* Very High water mark */
 111struct tlock *TxLock;   /* transaction lock table */
 112
 113/*
 114 *      transaction management lock
 115 */
 116static DEFINE_SPINLOCK(jfsTxnLock);
 117
 118#define TXN_LOCK()              spin_lock(&jfsTxnLock)
 119#define TXN_UNLOCK()            spin_unlock(&jfsTxnLock)
 120
 121#define LAZY_LOCK_INIT()        spin_lock_init(&TxAnchor.LazyLock);
 122#define LAZY_LOCK(flags)        spin_lock_irqsave(&TxAnchor.LazyLock, flags)
 123#define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
 124
 125static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait);
 126static int jfs_commit_thread_waking;
 127
 128/*
 129 * Retry logic exist outside these macros to protect from spurrious wakeups.
 130 */
 131static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
 132{
 133        DECLARE_WAITQUEUE(wait, current);
 134
 135        add_wait_queue(event, &wait);
 136        set_current_state(TASK_UNINTERRUPTIBLE);
 137        TXN_UNLOCK();
 138        io_schedule();
 139        __set_current_state(TASK_RUNNING);
 140        remove_wait_queue(event, &wait);
 141}
 142
 143#define TXN_SLEEP(event)\
 144{\
 145        TXN_SLEEP_DROP_LOCK(event);\
 146        TXN_LOCK();\
 147}
 148
 149#define TXN_WAKEUP(event) wake_up_all(event)
 150
 151/*
 152 *      statistics
 153 */
 154static struct {
 155        tid_t maxtid;           /* 4: biggest tid ever used */
 156        lid_t maxlid;           /* 4: biggest lid ever used */
 157        int ntid;               /* 4: # of transactions performed */
 158        int nlid;               /* 4: # of tlocks acquired */
 159        int waitlock;           /* 4: # of tlock wait */
 160} stattx;
 161
 162/*
 163 * forward references
 164 */
 165static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 166                struct tlock * tlck, struct commit * cd);
 167static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 168                struct tlock * tlck);
 169static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 170                struct tlock * tlck);
 171static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 172                struct tlock * tlck);
 173static void txAllocPMap(struct inode *ip, struct maplock * maplock,
 174                struct tblock * tblk);
 175static void txForce(struct tblock * tblk);
 176static int txLog(struct jfs_log * log, struct tblock * tblk,
 177                struct commit * cd);
 178static void txUpdateMap(struct tblock * tblk);
 179static void txRelease(struct tblock * tblk);
 180static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
 181           struct tlock * tlck);
 182static void LogSyncRelease(struct metapage * mp);
 183
 184/*
 185 *              transaction block/lock management
 186 *              ---------------------------------
 187 */
 188
 189/*
 190 * Get a transaction lock from the free list.  If the number in use is
 191 * greater than the high water mark, wake up the sync daemon.  This should
 192 * free some anonymous transaction locks.  (TXN_LOCK must be held.)
 193 */
 194static lid_t txLockAlloc(void)
 195{
 196        lid_t lid;
 197
 198        INCREMENT(TxStat.txLockAlloc);
 199        if (!TxAnchor.freelock) {
 200                INCREMENT(TxStat.txLockAlloc_freelock);
 201        }
 202
 203        while (!(lid = TxAnchor.freelock))
 204                TXN_SLEEP(&TxAnchor.freelockwait);
 205        TxAnchor.freelock = TxLock[lid].next;
 206        HIGHWATERMARK(stattx.maxlid, lid);
 207        if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) {
 208                jfs_info("txLockAlloc tlocks low");
 209                jfs_tlocks_low = 1;
 210                wake_up_process(jfsSyncThread);
 211        }
 212
 213        return lid;
 214}
 215
 216static void txLockFree(lid_t lid)
 217{
 218        TxLock[lid].tid = 0;
 219        TxLock[lid].next = TxAnchor.freelock;
 220        TxAnchor.freelock = lid;
 221        TxAnchor.tlocksInUse--;
 222        if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) {
 223                jfs_info("txLockFree jfs_tlocks_low no more");
 224                jfs_tlocks_low = 0;
 225                TXN_WAKEUP(&TxAnchor.lowlockwait);
 226        }
 227        TXN_WAKEUP(&TxAnchor.freelockwait);
 228}
 229
 230/*
 231 * NAME:        txInit()
 232 *
 233 * FUNCTION:    initialize transaction management structures
 234 *
 235 * RETURN:
 236 *
 237 * serialization: single thread at jfs_init()
 238 */
 239int txInit(void)
 240{
 241        int k, size;
 242        struct sysinfo si;
 243
 244        /* Set defaults for nTxLock and nTxBlock if unset */
 245
 246        if (nTxLock == -1) {
 247                if (nTxBlock == -1) {
 248                        /* Base default on memory size */
 249                        si_meminfo(&si);
 250                        if (si.totalram > (256 * 1024)) /* 1 GB */
 251                                nTxLock = 64 * 1024;
 252                        else
 253                                nTxLock = si.totalram >> 2;
 254                } else if (nTxBlock > (8 * 1024))
 255                        nTxLock = 64 * 1024;
 256                else
 257                        nTxLock = nTxBlock << 3;
 258        }
 259        if (nTxBlock == -1)
 260                nTxBlock = nTxLock >> 3;
 261
 262        /* Verify tunable parameters */
 263        if (nTxBlock < 16)
 264                nTxBlock = 16;  /* No one should set it this low */
 265        if (nTxBlock > 65536)
 266                nTxBlock = 65536;
 267        if (nTxLock < 256)
 268                nTxLock = 256;  /* No one should set it this low */
 269        if (nTxLock > 65536)
 270                nTxLock = 65536;
 271
 272        printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n",
 273               nTxBlock, nTxLock);
 274        /*
 275         * initialize transaction block (tblock) table
 276         *
 277         * transaction id (tid) = tblock index
 278         * tid = 0 is reserved.
 279         */
 280        TxLockLWM = (nTxLock * 4) / 10;
 281        TxLockHWM = (nTxLock * 7) / 10;
 282        TxLockVHWM = (nTxLock * 8) / 10;
 283
 284        size = sizeof(struct tblock) * nTxBlock;
 285        TxBlock = vmalloc(size);
 286        if (TxBlock == NULL)
 287                return -ENOMEM;
 288
 289        for (k = 1; k < nTxBlock - 1; k++) {
 290                TxBlock[k].next = k + 1;
 291                init_waitqueue_head(&TxBlock[k].gcwait);
 292                init_waitqueue_head(&TxBlock[k].waitor);
 293        }
 294        TxBlock[k].next = 0;
 295        init_waitqueue_head(&TxBlock[k].gcwait);
 296        init_waitqueue_head(&TxBlock[k].waitor);
 297
 298        TxAnchor.freetid = 1;
 299        init_waitqueue_head(&TxAnchor.freewait);
 300
 301        stattx.maxtid = 1;      /* statistics */
 302
 303        /*
 304         * initialize transaction lock (tlock) table
 305         *
 306         * transaction lock id = tlock index
 307         * tlock id = 0 is reserved.
 308         */
 309        size = sizeof(struct tlock) * nTxLock;
 310        TxLock = vmalloc(size);
 311        if (TxLock == NULL) {
 312                vfree(TxBlock);
 313                return -ENOMEM;
 314        }
 315
 316        /* initialize tlock table */
 317        for (k = 1; k < nTxLock - 1; k++)
 318                TxLock[k].next = k + 1;
 319        TxLock[k].next = 0;
 320        init_waitqueue_head(&TxAnchor.freelockwait);
 321        init_waitqueue_head(&TxAnchor.lowlockwait);
 322
 323        TxAnchor.freelock = 1;
 324        TxAnchor.tlocksInUse = 0;
 325        INIT_LIST_HEAD(&TxAnchor.anon_list);
 326        INIT_LIST_HEAD(&TxAnchor.anon_list2);
 327
 328        LAZY_LOCK_INIT();
 329        INIT_LIST_HEAD(&TxAnchor.unlock_queue);
 330
 331        stattx.maxlid = 1;      /* statistics */
 332
 333        return 0;
 334}
 335
 336/*
 337 * NAME:        txExit()
 338 *
 339 * FUNCTION:    clean up when module is unloaded
 340 */
 341void txExit(void)
 342{
 343        vfree(TxLock);
 344        TxLock = NULL;
 345        vfree(TxBlock);
 346        TxBlock = NULL;
 347}
 348
 349/*
 350 * NAME:        txBegin()
 351 *
 352 * FUNCTION:    start a transaction.
 353 *
 354 * PARAMETER:   sb      - superblock
 355 *              flag    - force for nested tx;
 356 *
 357 * RETURN:      tid     - transaction id
 358 *
 359 * note: flag force allows to start tx for nested tx
 360 * to prevent deadlock on logsync barrier;
 361 */
 362tid_t txBegin(struct super_block *sb, int flag)
 363{
 364        tid_t t;
 365        struct tblock *tblk;
 366        struct jfs_log *log;
 367
 368        jfs_info("txBegin: flag = 0x%x", flag);
 369        log = JFS_SBI(sb)->log;
 370
 371        TXN_LOCK();
 372
 373        INCREMENT(TxStat.txBegin);
 374
 375      retry:
 376        if (!(flag & COMMIT_FORCE)) {
 377                /*
 378                 * synchronize with logsync barrier
 379                 */
 380                if (test_bit(log_SYNCBARRIER, &log->flag) ||
 381                    test_bit(log_QUIESCE, &log->flag)) {
 382                        INCREMENT(TxStat.txBegin_barrier);
 383                        TXN_SLEEP(&log->syncwait);
 384                        goto retry;
 385                }
 386        }
 387        if (flag == 0) {
 388                /*
 389                 * Don't begin transaction if we're getting starved for tlocks
 390                 * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
 391                 * free tlocks)
 392                 */
 393                if (TxAnchor.tlocksInUse > TxLockVHWM) {
 394                        INCREMENT(TxStat.txBegin_lockslow);
 395                        TXN_SLEEP(&TxAnchor.lowlockwait);
 396                        goto retry;
 397                }
 398        }
 399
 400        /*
 401         * allocate transaction id/block
 402         */
 403        if ((t = TxAnchor.freetid) == 0) {
 404                jfs_info("txBegin: waiting for free tid");
 405                INCREMENT(TxStat.txBegin_freetid);
 406                TXN_SLEEP(&TxAnchor.freewait);
 407                goto retry;
 408        }
 409
 410        tblk = tid_to_tblock(t);
 411
 412        if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) {
 413                /* Don't let a non-forced transaction take the last tblk */
 414                jfs_info("txBegin: waiting for free tid");
 415                INCREMENT(TxStat.txBegin_freetid);
 416                TXN_SLEEP(&TxAnchor.freewait);
 417                goto retry;
 418        }
 419
 420        TxAnchor.freetid = tblk->next;
 421
 422        /*
 423         * initialize transaction
 424         */
 425
 426        /*
 427         * We can't zero the whole thing or we screw up another thread being
 428         * awakened after sleeping on tblk->waitor
 429         *
 430         * memset(tblk, 0, sizeof(struct tblock));
 431         */
 432        tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0;
 433
 434        tblk->sb = sb;
 435        ++log->logtid;
 436        tblk->logtid = log->logtid;
 437
 438        ++log->active;
 439
 440        HIGHWATERMARK(stattx.maxtid, t);        /* statistics */
 441        INCREMENT(stattx.ntid); /* statistics */
 442
 443        TXN_UNLOCK();
 444
 445        jfs_info("txBegin: returning tid = %d", t);
 446
 447        return t;
 448}
 449
 450/*
 451 * NAME:        txBeginAnon()
 452 *
 453 * FUNCTION:    start an anonymous transaction.
 454 *              Blocks if logsync or available tlocks are low to prevent
 455 *              anonymous tlocks from depleting supply.
 456 *
 457 * PARAMETER:   sb      - superblock
 458 *
 459 * RETURN:      none
 460 */
 461void txBeginAnon(struct super_block *sb)
 462{
 463        struct jfs_log *log;
 464
 465        log = JFS_SBI(sb)->log;
 466
 467        TXN_LOCK();
 468        INCREMENT(TxStat.txBeginAnon);
 469
 470      retry:
 471        /*
 472         * synchronize with logsync barrier
 473         */
 474        if (test_bit(log_SYNCBARRIER, &log->flag) ||
 475            test_bit(log_QUIESCE, &log->flag)) {
 476                INCREMENT(TxStat.txBeginAnon_barrier);
 477                TXN_SLEEP(&log->syncwait);
 478                goto retry;
 479        }
 480
 481        /*
 482         * Don't begin transaction if we're getting starved for tlocks
 483         */
 484        if (TxAnchor.tlocksInUse > TxLockVHWM) {
 485                INCREMENT(TxStat.txBeginAnon_lockslow);
 486                TXN_SLEEP(&TxAnchor.lowlockwait);
 487                goto retry;
 488        }
 489        TXN_UNLOCK();
 490}
 491
 492/*
 493 *      txEnd()
 494 *
 495 * function: free specified transaction block.
 496 *
 497 *      logsync barrier processing:
 498 *
 499 * serialization:
 500 */
 501void txEnd(tid_t tid)
 502{
 503        struct tblock *tblk = tid_to_tblock(tid);
 504        struct jfs_log *log;
 505
 506        jfs_info("txEnd: tid = %d", tid);
 507        TXN_LOCK();
 508
 509        /*
 510         * wakeup transactions waiting on the page locked
 511         * by the current transaction
 512         */
 513        TXN_WAKEUP(&tblk->waitor);
 514
 515        log = JFS_SBI(tblk->sb)->log;
 516
 517        /*
 518         * Lazy commit thread can't free this guy until we mark it UNLOCKED,
 519         * otherwise, we would be left with a transaction that may have been
 520         * reused.
 521         *
 522         * Lazy commit thread will turn off tblkGC_LAZY before calling this
 523         * routine.
 524         */
 525        if (tblk->flag & tblkGC_LAZY) {
 526                jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk);
 527                TXN_UNLOCK();
 528
 529                spin_lock_irq(&log->gclock);    // LOGGC_LOCK
 530                tblk->flag |= tblkGC_UNLOCKED;
 531                spin_unlock_irq(&log->gclock);  // LOGGC_UNLOCK
 532                return;
 533        }
 534
 535        jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk);
 536
 537        assert(tblk->next == 0);
 538
 539        /*
 540         * insert tblock back on freelist
 541         */
 542        tblk->next = TxAnchor.freetid;
 543        TxAnchor.freetid = tid;
 544
 545        /*
 546         * mark the tblock not active
 547         */
 548        if (--log->active == 0) {
 549                clear_bit(log_FLUSH, &log->flag);
 550
 551                /*
 552                 * synchronize with logsync barrier
 553                 */
 554                if (test_bit(log_SYNCBARRIER, &log->flag)) {
 555                        TXN_UNLOCK();
 556
 557                        /* write dirty metadata & forward log syncpt */
 558                        jfs_syncpt(log, 1);
 559
 560                        jfs_info("log barrier off: 0x%x", log->lsn);
 561
 562                        /* enable new transactions start */
 563                        clear_bit(log_SYNCBARRIER, &log->flag);
 564
 565                        /* wakeup all waitors for logsync barrier */
 566                        TXN_WAKEUP(&log->syncwait);
 567
 568                        goto wakeup;
 569                }
 570        }
 571
 572        TXN_UNLOCK();
 573wakeup:
 574        /*
 575         * wakeup all waitors for a free tblock
 576         */
 577        TXN_WAKEUP(&TxAnchor.freewait);
 578}
 579
 580/*
 581 *      txLock()
 582 *
 583 * function: acquire a transaction lock on the specified <mp>
 584 *
 585 * parameter:
 586 *
 587 * return:      transaction lock id
 588 *
 589 * serialization:
 590 */
 591struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
 592                     int type)
 593{
 594        struct jfs_inode_info *jfs_ip = JFS_IP(ip);
 595        int dir_xtree = 0;
 596        lid_t lid;
 597        tid_t xtid;
 598        struct tlock *tlck;
 599        struct xtlock *xtlck;
 600        struct linelock *linelock;
 601        xtpage_t *p;
 602        struct tblock *tblk;
 603
 604        TXN_LOCK();
 605
 606        if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) &&
 607            !(mp->xflag & COMMIT_PAGE)) {
 608                /*
 609                 * Directory inode is special.  It can have both an xtree tlock
 610                 * and a dtree tlock associated with it.
 611                 */
 612                dir_xtree = 1;
 613                lid = jfs_ip->xtlid;
 614        } else
 615                lid = mp->lid;
 616
 617        /* is page not locked by a transaction ? */
 618        if (lid == 0)
 619                goto allocateLock;
 620
 621        jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid);
 622
 623        /* is page locked by the requester transaction ? */
 624        tlck = lid_to_tlock(lid);
 625        if ((xtid = tlck->tid) == tid) {
 626                TXN_UNLOCK();
 627                goto grantLock;
 628        }
 629
 630        /*
 631         * is page locked by anonymous transaction/lock ?
 632         *
 633         * (page update without transaction (i.e., file write) is
 634         * locked under anonymous transaction tid = 0:
 635         * anonymous tlocks maintained on anonymous tlock list of
 636         * the inode of the page and available to all anonymous
 637         * transactions until txCommit() time at which point
 638         * they are transferred to the transaction tlock list of
 639         * the committing transaction of the inode)
 640         */
 641        if (xtid == 0) {
 642                tlck->tid = tid;
 643                TXN_UNLOCK();
 644                tblk = tid_to_tblock(tid);
 645                /*
 646                 * The order of the tlocks in the transaction is important
 647                 * (during truncate, child xtree pages must be freed before
 648                 * parent's tlocks change the working map).
 649                 * Take tlock off anonymous list and add to tail of
 650                 * transaction list
 651                 *
 652                 * Note:  We really need to get rid of the tid & lid and
 653                 * use list_head's.  This code is getting UGLY!
 654                 */
 655                if (jfs_ip->atlhead == lid) {
 656                        if (jfs_ip->atltail == lid) {
 657                                /* only anonymous txn.
 658                                 * Remove from anon_list
 659                                 */
 660                                TXN_LOCK();
 661                                list_del_init(&jfs_ip->anon_inode_list);
 662                                TXN_UNLOCK();
 663                        }
 664                        jfs_ip->atlhead = tlck->next;
 665                } else {
 666                        lid_t last;
 667                        for (last = jfs_ip->atlhead;
 668                             lid_to_tlock(last)->next != lid;
 669                             last = lid_to_tlock(last)->next) {
 670                                assert(last);
 671                        }
 672                        lid_to_tlock(last)->next = tlck->next;
 673                        if (jfs_ip->atltail == lid)
 674                                jfs_ip->atltail = last;
 675                }
 676
 677                /* insert the tlock at tail of transaction tlock list */
 678
 679                if (tblk->next)
 680                        lid_to_tlock(tblk->last)->next = lid;
 681                else
 682                        tblk->next = lid;
 683                tlck->next = 0;
 684                tblk->last = lid;
 685
 686                goto grantLock;
 687        }
 688
 689        goto waitLock;
 690
 691        /*
 692         * allocate a tlock
 693         */
 694      allocateLock:
 695        lid = txLockAlloc();
 696        tlck = lid_to_tlock(lid);
 697
 698        /*
 699         * initialize tlock
 700         */
 701        tlck->tid = tid;
 702
 703        TXN_UNLOCK();
 704
 705        /* mark tlock for meta-data page */
 706        if (mp->xflag & COMMIT_PAGE) {
 707
 708                tlck->flag = tlckPAGELOCK;
 709
 710                /* mark the page dirty and nohomeok */
 711                metapage_nohomeok(mp);
 712
 713                jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
 714                         mp, mp->nohomeok, tid, tlck);
 715
 716                /* if anonymous transaction, and buffer is on the group
 717                 * commit synclist, mark inode to show this.  This will
 718                 * prevent the buffer from being marked nohomeok for too
 719                 * long a time.
 720                 */
 721                if ((tid == 0) && mp->lsn)
 722                        set_cflag(COMMIT_Synclist, ip);
 723        }
 724        /* mark tlock for in-memory inode */
 725        else
 726                tlck->flag = tlckINODELOCK;
 727
 728        if (S_ISDIR(ip->i_mode))
 729                tlck->flag |= tlckDIRECTORY;
 730
 731        tlck->type = 0;
 732
 733        /* bind the tlock and the page */
 734        tlck->ip = ip;
 735        tlck->mp = mp;
 736        if (dir_xtree)
 737                jfs_ip->xtlid = lid;
 738        else
 739                mp->lid = lid;
 740
 741        /*
 742         * enqueue transaction lock to transaction/inode
 743         */
 744        /* insert the tlock at tail of transaction tlock list */
 745        if (tid) {
 746                tblk = tid_to_tblock(tid);
 747                if (tblk->next)
 748                        lid_to_tlock(tblk->last)->next = lid;
 749                else
 750                        tblk->next = lid;
 751                tlck->next = 0;
 752                tblk->last = lid;
 753        }
 754        /* anonymous transaction:
 755         * insert the tlock at head of inode anonymous tlock list
 756         */
 757        else {
 758                tlck->next = jfs_ip->atlhead;
 759                jfs_ip->atlhead = lid;
 760                if (tlck->next == 0) {
 761                        /* This inode's first anonymous transaction */
 762                        jfs_ip->atltail = lid;
 763                        TXN_LOCK();
 764                        list_add_tail(&jfs_ip->anon_inode_list,
 765                                      &TxAnchor.anon_list);
 766                        TXN_UNLOCK();
 767                }
 768        }
 769
 770        /* initialize type dependent area for linelock */
 771        linelock = (struct linelock *) & tlck->lock;
 772        linelock->next = 0;
 773        linelock->flag = tlckLINELOCK;
 774        linelock->maxcnt = TLOCKSHORT;
 775        linelock->index = 0;
 776
 777        switch (type & tlckTYPE) {
 778        case tlckDTREE:
 779                linelock->l2linesize = L2DTSLOTSIZE;
 780                break;
 781
 782        case tlckXTREE:
 783                linelock->l2linesize = L2XTSLOTSIZE;
 784
 785                xtlck = (struct xtlock *) linelock;
 786                xtlck->header.offset = 0;
 787                xtlck->header.length = 2;
 788
 789                if (type & tlckNEW) {
 790                        xtlck->lwm.offset = XTENTRYSTART;
 791                } else {
 792                        if (mp->xflag & COMMIT_PAGE)
 793                                p = (xtpage_t *) mp->data;
 794                        else
 795                                p = &jfs_ip->i_xtroot;
 796                        xtlck->lwm.offset =
 797                            le16_to_cpu(p->header.nextindex);
 798                }
 799                xtlck->lwm.length = 0;  /* ! */
 800                xtlck->twm.offset = 0;
 801                xtlck->hwm.offset = 0;
 802
 803                xtlck->index = 2;
 804                break;
 805
 806        case tlckINODE:
 807                linelock->l2linesize = L2INODESLOTSIZE;
 808                break;
 809
 810        case tlckDATA:
 811                linelock->l2linesize = L2DATASLOTSIZE;
 812                break;
 813
 814        default:
 815                jfs_err("UFO tlock:0x%p", tlck);
 816        }
 817
 818        /*
 819         * update tlock vector
 820         */
 821      grantLock:
 822        tlck->type |= type;
 823
 824        return tlck;
 825
 826        /*
 827         * page is being locked by another transaction:
 828         */
 829      waitLock:
 830        /* Only locks on ipimap or ipaimap should reach here */
 831        /* assert(jfs_ip->fileset == AGGREGATE_I); */
 832        if (jfs_ip->fileset != AGGREGATE_I) {
 833                printk(KERN_ERR "txLock: trying to lock locked page!");
 834                print_hex_dump(KERN_ERR, "ip: ", DUMP_PREFIX_ADDRESS, 16, 4,
 835                               ip, sizeof(*ip), 0);
 836                print_hex_dump(KERN_ERR, "mp: ", DUMP_PREFIX_ADDRESS, 16, 4,
 837                               mp, sizeof(*mp), 0);
 838                print_hex_dump(KERN_ERR, "Locker's tblock: ",
 839                               DUMP_PREFIX_ADDRESS, 16, 4, tid_to_tblock(tid),
 840                               sizeof(struct tblock), 0);
 841                print_hex_dump(KERN_ERR, "Tlock: ", DUMP_PREFIX_ADDRESS, 16, 4,
 842                               tlck, sizeof(*tlck), 0);
 843                BUG();
 844        }
 845        INCREMENT(stattx.waitlock);     /* statistics */
 846        TXN_UNLOCK();
 847        release_metapage(mp);
 848        TXN_LOCK();
 849        xtid = tlck->tid;       /* reacquire after dropping TXN_LOCK */
 850
 851        jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
 852                 tid, xtid, lid);
 853
 854        /* Recheck everything since dropping TXN_LOCK */
 855        if (xtid && (tlck->mp == mp) && (mp->lid == lid))
 856                TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
 857        else
 858                TXN_UNLOCK();
 859        jfs_info("txLock: awakened     tid = %d, lid = %d", tid, lid);
 860
 861        return NULL;
 862}
 863
 864/*
 865 * NAME:        txRelease()
 866 *
 867 * FUNCTION:    Release buffers associated with transaction locks, but don't
 868 *              mark homeok yet.  The allows other transactions to modify
 869 *              buffers, but won't let them go to disk until commit record
 870 *              actually gets written.
 871 *
 872 * PARAMETER:
 873 *              tblk    -
 874 *
 875 * RETURN:      Errors from subroutines.
 876 */
 877static void txRelease(struct tblock * tblk)
 878{
 879        struct metapage *mp;
 880        lid_t lid;
 881        struct tlock *tlck;
 882
 883        TXN_LOCK();
 884
 885        for (lid = tblk->next; lid; lid = tlck->next) {
 886                tlck = lid_to_tlock(lid);
 887                if ((mp = tlck->mp) != NULL &&
 888                    (tlck->type & tlckBTROOT) == 0) {
 889                        assert(mp->xflag & COMMIT_PAGE);
 890                        mp->lid = 0;
 891                }
 892        }
 893
 894        /*
 895         * wakeup transactions waiting on a page locked
 896         * by the current transaction
 897         */
 898        TXN_WAKEUP(&tblk->waitor);
 899
 900        TXN_UNLOCK();
 901}
 902
 903/*
 904 * NAME:        txUnlock()
 905 *
 906 * FUNCTION:    Initiates pageout of pages modified by tid in journalled
 907 *              objects and frees their lockwords.
 908 */
 909static void txUnlock(struct tblock * tblk)
 910{
 911        struct tlock *tlck;
 912        struct linelock *linelock;
 913        lid_t lid, next, llid, k;
 914        struct metapage *mp;
 915        struct jfs_log *log;
 916        int difft, diffp;
 917        unsigned long flags;
 918
 919        jfs_info("txUnlock: tblk = 0x%p", tblk);
 920        log = JFS_SBI(tblk->sb)->log;
 921
 922        /*
 923         * mark page under tlock homeok (its log has been written):
 924         */
 925        for (lid = tblk->next; lid; lid = next) {
 926                tlck = lid_to_tlock(lid);
 927                next = tlck->next;
 928
 929                jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck);
 930
 931                /* unbind page from tlock */
 932                if ((mp = tlck->mp) != NULL &&
 933                    (tlck->type & tlckBTROOT) == 0) {
 934                        assert(mp->xflag & COMMIT_PAGE);
 935
 936                        /* hold buffer
 937                         */
 938                        hold_metapage(mp);
 939
 940                        assert(mp->nohomeok > 0);
 941                        _metapage_homeok(mp);
 942
 943                        /* inherit younger/larger clsn */
 944                        LOGSYNC_LOCK(log, flags);
 945                        if (mp->clsn) {
 946                                logdiff(difft, tblk->clsn, log);
 947                                logdiff(diffp, mp->clsn, log);
 948                                if (difft > diffp)
 949                                        mp->clsn = tblk->clsn;
 950                        } else
 951                                mp->clsn = tblk->clsn;
 952                        LOGSYNC_UNLOCK(log, flags);
 953
 954                        assert(!(tlck->flag & tlckFREEPAGE));
 955
 956                        put_metapage(mp);
 957                }
 958
 959                /* insert tlock, and linelock(s) of the tlock if any,
 960                 * at head of freelist
 961                 */
 962                TXN_LOCK();
 963
 964                llid = ((struct linelock *) & tlck->lock)->next;
 965                while (llid) {
 966                        linelock = (struct linelock *) lid_to_tlock(llid);
 967                        k = linelock->next;
 968                        txLockFree(llid);
 969                        llid = k;
 970                }
 971                txLockFree(lid);
 972
 973                TXN_UNLOCK();
 974        }
 975        tblk->next = tblk->last = 0;
 976
 977        /*
 978         * remove tblock from logsynclist
 979         * (allocation map pages inherited lsn of tblk and
 980         * has been inserted in logsync list at txUpdateMap())
 981         */
 982        if (tblk->lsn) {
 983                LOGSYNC_LOCK(log, flags);
 984                log->count--;
 985                list_del(&tblk->synclist);
 986                LOGSYNC_UNLOCK(log, flags);
 987        }
 988}
 989
 990/*
 991 *      txMaplock()
 992 *
 993 * function: allocate a transaction lock for freed page/entry;
 994 *      for freed page, maplock is used as xtlock/dtlock type;
 995 */
 996struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
 997{
 998        struct jfs_inode_info *jfs_ip = JFS_IP(ip);
 999        lid_t lid;
1000        struct tblock *tblk;
1001        struct tlock *tlck;
1002        struct maplock *maplock;
1003
1004        TXN_LOCK();
1005
1006        /*
1007         * allocate a tlock
1008         */
1009        lid = txLockAlloc();
1010        tlck = lid_to_tlock(lid);
1011
1012        /*
1013         * initialize tlock
1014         */
1015        tlck->tid = tid;
1016
1017        /* bind the tlock and the object */
1018        tlck->flag = tlckINODELOCK;
1019        if (S_ISDIR(ip->i_mode))
1020                tlck->flag |= tlckDIRECTORY;
1021        tlck->ip = ip;
1022        tlck->mp = NULL;
1023
1024        tlck->type = type;
1025
1026        /*
1027         * enqueue transaction lock to transaction/inode
1028         */
1029        /* insert the tlock at tail of transaction tlock list */
1030        if (tid) {
1031                tblk = tid_to_tblock(tid);
1032                if (tblk->next)
1033                        lid_to_tlock(tblk->last)->next = lid;
1034                else
1035                        tblk->next = lid;
1036                tlck->next = 0;
1037                tblk->last = lid;
1038        }
1039        /* anonymous transaction:
1040         * insert the tlock at head of inode anonymous tlock list
1041         */
1042        else {
1043                tlck->next = jfs_ip->atlhead;
1044                jfs_ip->atlhead = lid;
1045                if (tlck->next == 0) {
1046                        /* This inode's first anonymous transaction */
1047                        jfs_ip->atltail = lid;
1048                        list_add_tail(&jfs_ip->anon_inode_list,
1049                                      &TxAnchor.anon_list);
1050                }
1051        }
1052
1053        TXN_UNLOCK();
1054
1055        /* initialize type dependent area for maplock */
1056        maplock = (struct maplock *) & tlck->lock;
1057        maplock->next = 0;
1058        maplock->maxcnt = 0;
1059        maplock->index = 0;
1060
1061        return tlck;
1062}
1063
1064/*
1065 *      txLinelock()
1066 *
1067 * function: allocate a transaction lock for log vector list
1068 */
1069struct linelock *txLinelock(struct linelock * tlock)
1070{
1071        lid_t lid;
1072        struct tlock *tlck;
1073        struct linelock *linelock;
1074
1075        TXN_LOCK();
1076
1077        /* allocate a TxLock structure */
1078        lid = txLockAlloc();
1079        tlck = lid_to_tlock(lid);
1080
1081        TXN_UNLOCK();
1082
1083        /* initialize linelock */
1084        linelock = (struct linelock *) tlck;
1085        linelock->next = 0;
1086        linelock->flag = tlckLINELOCK;
1087        linelock->maxcnt = TLOCKLONG;
1088        linelock->index = 0;
1089        if (tlck->flag & tlckDIRECTORY)
1090                linelock->flag |= tlckDIRECTORY;
1091
1092        /* append linelock after tlock */
1093        linelock->next = tlock->next;
1094        tlock->next = lid;
1095
1096        return linelock;
1097}
1098
1099/*
1100 *              transaction commit management
1101 *              -----------------------------
1102 */
1103
1104/*
1105 * NAME:        txCommit()
1106 *
1107 * FUNCTION:    commit the changes to the objects specified in
1108 *              clist.  For journalled segments only the
1109 *              changes of the caller are committed, ie by tid.
1110 *              for non-journalled segments the data are flushed to
1111 *              disk and then the change to the disk inode and indirect
1112 *              blocks committed (so blocks newly allocated to the
1113 *              segment will be made a part of the segment atomically).
1114 *
1115 *              all of the segments specified in clist must be in
1116 *              one file system. no more than 6 segments are needed
1117 *              to handle all unix svcs.
1118 *
1119 *              if the i_nlink field (i.e. disk inode link count)
1120 *              is zero, and the type of inode is a regular file or
1121 *              directory, or symbolic link , the inode is truncated
1122 *              to zero length. the truncation is committed but the
1123 *              VM resources are unaffected until it is closed (see
1124 *              iput and iclose).
1125 *
1126 * PARAMETER:
1127 *
1128 * RETURN:
1129 *
1130 * serialization:
1131 *              on entry the inode lock on each segment is assumed
1132 *              to be held.
1133 *
1134 * i/o error:
1135 */
1136int txCommit(tid_t tid,         /* transaction identifier */
1137             int nip,           /* number of inodes to commit */
1138             struct inode **iplist,     /* list of inode to commit */
1139             int flag)
1140{
1141        int rc = 0;
1142        struct commit cd;
1143        struct jfs_log *log;
1144        struct tblock *tblk;
1145        struct lrd *lrd;
1146        struct inode *ip;
1147        struct jfs_inode_info *jfs_ip;
1148        int k, n;
1149        ino_t top;
1150        struct super_block *sb;
1151
1152        jfs_info("txCommit, tid = %d, flag = %d", tid, flag);
1153        /* is read-only file system ? */
1154        if (isReadOnly(iplist[0])) {
1155                rc = -EROFS;
1156                goto TheEnd;
1157        }
1158
1159        sb = cd.sb = iplist[0]->i_sb;
1160        cd.tid = tid;
1161
1162        if (tid == 0)
1163                tid = txBegin(sb, 0);
1164        tblk = tid_to_tblock(tid);
1165
1166        /*
1167         * initialize commit structure
1168         */
1169        log = JFS_SBI(sb)->log;
1170        cd.log = log;
1171
1172        /* initialize log record descriptor in commit */
1173        lrd = &cd.lrd;
1174        lrd->logtid = cpu_to_le32(tblk->logtid);
1175        lrd->backchain = 0;
1176
1177        tblk->xflag |= flag;
1178
1179        if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0)
1180                tblk->xflag |= COMMIT_LAZY;
1181        /*
1182         *      prepare non-journaled objects for commit
1183         *
1184         * flush data pages of non-journaled file
1185         * to prevent the file getting non-initialized disk blocks
1186         * in case of crash.
1187         * (new blocks - )
1188         */
1189        cd.iplist = iplist;
1190        cd.nip = nip;
1191
1192        /*
1193         *      acquire transaction lock on (on-disk) inodes
1194         *
1195         * update on-disk inode from in-memory inode
1196         * acquiring transaction locks for AFTER records
1197         * on the on-disk inode of file object
1198         *
1199         * sort the inodes array by inode number in descending order
1200         * to prevent deadlock when acquiring transaction lock
1201         * of on-disk inodes on multiple on-disk inode pages by
1202         * multiple concurrent transactions
1203         */
1204        for (k = 0; k < cd.nip; k++) {
1205                top = (cd.iplist[k])->i_ino;
1206                for (n = k + 1; n < cd.nip; n++) {
1207                        ip = cd.iplist[n];
1208                        if (ip->i_ino > top) {
1209                                top = ip->i_ino;
1210                                cd.iplist[n] = cd.iplist[k];
1211                                cd.iplist[k] = ip;
1212                        }
1213                }
1214
1215                ip = cd.iplist[k];
1216                jfs_ip = JFS_IP(ip);
1217
1218                /*
1219                 * BUGBUG - This code has temporarily been removed.  The
1220                 * intent is to ensure that any file data is written before
1221                 * the metadata is committed to the journal.  This prevents
1222                 * uninitialized data from appearing in a file after the
1223                 * journal has been replayed.  (The uninitialized data
1224                 * could be sensitive data removed by another user.)
1225                 *
1226                 * The problem now is that we are holding the IWRITELOCK
1227                 * on the inode, and calling filemap_fdatawrite on an
1228                 * unmapped page will cause a deadlock in jfs_get_block.
1229                 *
1230                 * The long term solution is to pare down the use of
1231                 * IWRITELOCK.  We are currently holding it too long.
1232                 * We could also be smarter about which data pages need
1233                 * to be written before the transaction is committed and
1234                 * when we don't need to worry about it at all.
1235                 *
1236                 * if ((!S_ISDIR(ip->i_mode))
1237                 *    && (tblk->flag & COMMIT_DELETE) == 0)
1238                 *      filemap_write_and_wait(ip->i_mapping);
1239                 */
1240
1241                /*
1242                 * Mark inode as not dirty.  It will still be on the dirty
1243                 * inode list, but we'll know not to commit it again unless
1244                 * it gets marked dirty again
1245                 */
1246                clear_cflag(COMMIT_Dirty, ip);
1247
1248                /* inherit anonymous tlock(s) of inode */
1249                if (jfs_ip->atlhead) {
1250                        lid_to_tlock(jfs_ip->atltail)->next = tblk->next;
1251                        tblk->next = jfs_ip->atlhead;
1252                        if (!tblk->last)
1253                                tblk->last = jfs_ip->atltail;
1254                        jfs_ip->atlhead = jfs_ip->atltail = 0;
1255                        TXN_LOCK();
1256                        list_del_init(&jfs_ip->anon_inode_list);
1257                        TXN_UNLOCK();
1258                }
1259
1260                /*
1261                 * acquire transaction lock on on-disk inode page
1262                 * (become first tlock of the tblk's tlock list)
1263                 */
1264                if (((rc = diWrite(tid, ip))))
1265                        goto out;
1266        }
1267
1268        /*
1269         *      write log records from transaction locks
1270         *
1271         * txUpdateMap() resets XAD_NEW in XAD.
1272         */
1273        if ((rc = txLog(log, tblk, &cd)))
1274                goto TheEnd;
1275
1276        /*
1277         * Ensure that inode isn't reused before
1278         * lazy commit thread finishes processing
1279         */
1280        if (tblk->xflag & COMMIT_DELETE) {
1281                ihold(tblk->u.ip);
1282                /*
1283                 * Avoid a rare deadlock
1284                 *
1285                 * If the inode is locked, we may be blocked in
1286                 * jfs_commit_inode.  If so, we don't want the
1287                 * lazy_commit thread doing the last iput() on the inode
1288                 * since that may block on the locked inode.  Instead,
1289                 * commit the transaction synchronously, so the last iput
1290                 * will be done by the calling thread (or later)
1291                 */
1292                /*
1293                 * I believe this code is no longer needed.  Splitting I_LOCK
1294                 * into two bits, I_NEW and I_SYNC should prevent this
1295                 * deadlock as well.  But since I don't have a JFS testload
1296                 * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
1297                 * Joern
1298                 */
1299                if (tblk->u.ip->i_state & I_SYNC)
1300                        tblk->xflag &= ~COMMIT_LAZY;
1301        }
1302
1303        ASSERT((!(tblk->xflag & COMMIT_DELETE)) ||
1304               ((tblk->u.ip->i_nlink == 0) &&
1305                !test_cflag(COMMIT_Nolink, tblk->u.ip)));
1306
1307        /*
1308         *      write COMMIT log record
1309         */
1310        lrd->type = cpu_to_le16(LOG_COMMIT);
1311        lrd->length = 0;
1312        lmLog(log, tblk, lrd, NULL);
1313
1314        lmGroupCommit(log, tblk);
1315
1316        /*
1317         *      - transaction is now committed -
1318         */
1319
1320        /*
1321         * force pages in careful update
1322         * (imap addressing structure update)
1323         */
1324        if (flag & COMMIT_FORCE)
1325                txForce(tblk);
1326
1327        /*
1328         *      update allocation map.
1329         *
1330         * update inode allocation map and inode:
1331         * free pager lock on memory object of inode if any.
1332         * update block allocation map.
1333         *
1334         * txUpdateMap() resets XAD_NEW in XAD.
1335         */
1336        if (tblk->xflag & COMMIT_FORCE)
1337                txUpdateMap(tblk);
1338
1339        /*
1340         *      free transaction locks and pageout/free pages
1341         */
1342        txRelease(tblk);
1343
1344        if ((tblk->flag & tblkGC_LAZY) == 0)
1345                txUnlock(tblk);
1346
1347
1348        /*
1349         *      reset in-memory object state
1350         */
1351        for (k = 0; k < cd.nip; k++) {
1352                ip = cd.iplist[k];
1353                jfs_ip = JFS_IP(ip);
1354
1355                /*
1356                 * reset in-memory inode state
1357                 */
1358                jfs_ip->bxflag = 0;
1359                jfs_ip->blid = 0;
1360        }
1361
1362      out:
1363        if (rc != 0)
1364                txAbort(tid, 1);
1365
1366      TheEnd:
1367        jfs_info("txCommit: tid = %d, returning %d", tid, rc);
1368        return rc;
1369}
1370
1371/*
1372 * NAME:        txLog()
1373 *
1374 * FUNCTION:    Writes AFTER log records for all lines modified
1375 *              by tid for segments specified by inodes in comdata.
1376 *              Code assumes only WRITELOCKS are recorded in lockwords.
1377 *
1378 * PARAMETERS:
1379 *
1380 * RETURN :
1381 */
1382static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
1383{
1384        int rc = 0;
1385        struct inode *ip;
1386        lid_t lid;
1387        struct tlock *tlck;
1388        struct lrd *lrd = &cd->lrd;
1389
1390        /*
1391         * write log record(s) for each tlock of transaction,
1392         */
1393        for (lid = tblk->next; lid; lid = tlck->next) {
1394                tlck = lid_to_tlock(lid);
1395
1396                tlck->flag |= tlckLOG;
1397
1398                /* initialize lrd common */
1399                ip = tlck->ip;
1400                lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate);
1401                lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset);
1402                lrd->log.redopage.inode = cpu_to_le32(ip->i_ino);
1403
1404                /* write log record of page from the tlock */
1405                switch (tlck->type & tlckTYPE) {
1406                case tlckXTREE:
1407                        xtLog(log, tblk, lrd, tlck);
1408                        break;
1409
1410                case tlckDTREE:
1411                        dtLog(log, tblk, lrd, tlck);
1412                        break;
1413
1414                case tlckINODE:
1415                        diLog(log, tblk, lrd, tlck, cd);
1416                        break;
1417
1418                case tlckMAP:
1419                        mapLog(log, tblk, lrd, tlck);
1420                        break;
1421
1422                case tlckDATA:
1423                        dataLog(log, tblk, lrd, tlck);
1424                        break;
1425
1426                default:
1427                        jfs_err("UFO tlock:0x%p", tlck);
1428                }
1429        }
1430
1431        return rc;
1432}
1433
1434/*
1435 *      diLog()
1436 *
1437 * function:    log inode tlock and format maplock to update bmap;
1438 */
1439static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1440                 struct tlock * tlck, struct commit * cd)
1441{
1442        int rc = 0;
1443        struct metapage *mp;
1444        pxd_t *pxd;
1445        struct pxd_lock *pxdlock;
1446
1447        mp = tlck->mp;
1448
1449        /* initialize as REDOPAGE record format */
1450        lrd->log.redopage.type = cpu_to_le16(LOG_INODE);
1451        lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE);
1452
1453        pxd = &lrd->log.redopage.pxd;
1454
1455        /*
1456         *      inode after image
1457         */
1458        if (tlck->type & tlckENTRY) {
1459                /* log after-image for logredo(): */
1460                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1461                PXDaddress(pxd, mp->index);
1462                PXDlength(pxd,
1463                          mp->logical_size >> tblk->sb->s_blocksize_bits);
1464                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1465
1466                /* mark page as homeward bound */
1467                tlck->flag |= tlckWRITEPAGE;
1468        } else if (tlck->type & tlckFREE) {
1469                /*
1470                 *      free inode extent
1471                 *
1472                 * (pages of the freed inode extent have been invalidated and
1473                 * a maplock for free of the extent has been formatted at
1474                 * txLock() time);
1475                 *
1476                 * the tlock had been acquired on the inode allocation map page
1477                 * (iag) that specifies the freed extent, even though the map
1478                 * page is not itself logged, to prevent pageout of the map
1479                 * page before the log;
1480                 */
1481
1482                /* log LOG_NOREDOINOEXT of the freed inode extent for
1483                 * logredo() to start NoRedoPage filters, and to update
1484                 * imap and bmap for free of the extent;
1485                 */
1486                lrd->type = cpu_to_le16(LOG_NOREDOINOEXT);
1487                /*
1488                 * For the LOG_NOREDOINOEXT record, we need
1489                 * to pass the IAG number and inode extent
1490                 * index (within that IAG) from which the
1491                 * the extent being released.  These have been
1492                 * passed to us in the iplist[1] and iplist[2].
1493                 */
1494                lrd->log.noredoinoext.iagnum =
1495                    cpu_to_le32((u32) (size_t) cd->iplist[1]);
1496                lrd->log.noredoinoext.inoext_idx =
1497                    cpu_to_le32((u32) (size_t) cd->iplist[2]);
1498
1499                pxdlock = (struct pxd_lock *) & tlck->lock;
1500                *pxd = pxdlock->pxd;
1501                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1502
1503                /* update bmap */
1504                tlck->flag |= tlckUPDATEMAP;
1505
1506                /* mark page as homeward bound */
1507                tlck->flag |= tlckWRITEPAGE;
1508        } else
1509                jfs_err("diLog: UFO type tlck:0x%p", tlck);
1510#ifdef  _JFS_WIP
1511        /*
1512         *      alloc/free external EA extent
1513         *
1514         * a maplock for txUpdateMap() to update bPWMAP for alloc/free
1515         * of the extent has been formatted at txLock() time;
1516         */
1517        else {
1518                assert(tlck->type & tlckEA);
1519
1520                /* log LOG_UPDATEMAP for logredo() to update bmap for
1521                 * alloc of new (and free of old) external EA extent;
1522                 */
1523                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1524                pxdlock = (struct pxd_lock *) & tlck->lock;
1525                nlock = pxdlock->index;
1526                for (i = 0; i < nlock; i++, pxdlock++) {
1527                        if (pxdlock->flag & mlckALLOCPXD)
1528                                lrd->log.updatemap.type =
1529                                    cpu_to_le16(LOG_ALLOCPXD);
1530                        else
1531                                lrd->log.updatemap.type =
1532                                    cpu_to_le16(LOG_FREEPXD);
1533                        lrd->log.updatemap.nxd = cpu_to_le16(1);
1534                        lrd->log.updatemap.pxd = pxdlock->pxd;
1535                        lrd->backchain =
1536                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1537                }
1538
1539                /* update bmap */
1540                tlck->flag |= tlckUPDATEMAP;
1541        }
1542#endif                          /* _JFS_WIP */
1543
1544        return rc;
1545}
1546
1547/*
1548 *      dataLog()
1549 *
1550 * function:    log data tlock
1551 */
1552static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1553            struct tlock * tlck)
1554{
1555        struct metapage *mp;
1556        pxd_t *pxd;
1557
1558        mp = tlck->mp;
1559
1560        /* initialize as REDOPAGE record format */
1561        lrd->log.redopage.type = cpu_to_le16(LOG_DATA);
1562        lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE);
1563
1564        pxd = &lrd->log.redopage.pxd;
1565
1566        /* log after-image for logredo(): */
1567        lrd->type = cpu_to_le16(LOG_REDOPAGE);
1568
1569        if (jfs_dirtable_inline(tlck->ip)) {
1570                /*
1571                 * The table has been truncated, we've must have deleted
1572                 * the last entry, so don't bother logging this
1573                 */
1574                mp->lid = 0;
1575                grab_metapage(mp);
1576                metapage_homeok(mp);
1577                discard_metapage(mp);
1578                tlck->mp = NULL;
1579                return 0;
1580        }
1581
1582        PXDaddress(pxd, mp->index);
1583        PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits);
1584
1585        lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1586
1587        /* mark page as homeward bound */
1588        tlck->flag |= tlckWRITEPAGE;
1589
1590        return 0;
1591}
1592
1593/*
1594 *      dtLog()
1595 *
1596 * function:    log dtree tlock and format maplock to update bmap;
1597 */
1598static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1599           struct tlock * tlck)
1600{
1601        struct metapage *mp;
1602        struct pxd_lock *pxdlock;
1603        pxd_t *pxd;
1604
1605        mp = tlck->mp;
1606
1607        /* initialize as REDOPAGE/NOREDOPAGE record format */
1608        lrd->log.redopage.type = cpu_to_le16(LOG_DTREE);
1609        lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE);
1610
1611        pxd = &lrd->log.redopage.pxd;
1612
1613        if (tlck->type & tlckBTROOT)
1614                lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
1615
1616        /*
1617         *      page extension via relocation: entry insertion;
1618         *      page extension in-place: entry insertion;
1619         *      new right page from page split, reinitialized in-line
1620         *      root from root page split: entry insertion;
1621         */
1622        if (tlck->type & (tlckNEW | tlckEXTEND)) {
1623                /* log after-image of the new page for logredo():
1624                 * mark log (LOG_NEW) for logredo() to initialize
1625                 * freelist and update bmap for alloc of the new page;
1626                 */
1627                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1628                if (tlck->type & tlckEXTEND)
1629                        lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND);
1630                else
1631                        lrd->log.redopage.type |= cpu_to_le16(LOG_NEW);
1632                PXDaddress(pxd, mp->index);
1633                PXDlength(pxd,
1634                          mp->logical_size >> tblk->sb->s_blocksize_bits);
1635                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1636
1637                /* format a maplock for txUpdateMap() to update bPMAP for
1638                 * alloc of the new page;
1639                 */
1640                if (tlck->type & tlckBTROOT)
1641                        return;
1642                tlck->flag |= tlckUPDATEMAP;
1643                pxdlock = (struct pxd_lock *) & tlck->lock;
1644                pxdlock->flag = mlckALLOCPXD;
1645                pxdlock->pxd = *pxd;
1646
1647                pxdlock->index = 1;
1648
1649                /* mark page as homeward bound */
1650                tlck->flag |= tlckWRITEPAGE;
1651                return;
1652        }
1653
1654        /*
1655         *      entry insertion/deletion,
1656         *      sibling page link update (old right page before split);
1657         */
1658        if (tlck->type & (tlckENTRY | tlckRELINK)) {
1659                /* log after-image for logredo(): */
1660                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1661                PXDaddress(pxd, mp->index);
1662                PXDlength(pxd,
1663                          mp->logical_size >> tblk->sb->s_blocksize_bits);
1664                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1665
1666                /* mark page as homeward bound */
1667                tlck->flag |= tlckWRITEPAGE;
1668                return;
1669        }
1670
1671        /*
1672         *      page deletion: page has been invalidated
1673         *      page relocation: source extent
1674         *
1675         *      a maplock for free of the page has been formatted
1676         *      at txLock() time);
1677         */
1678        if (tlck->type & (tlckFREE | tlckRELOCATE)) {
1679                /* log LOG_NOREDOPAGE of the deleted page for logredo()
1680                 * to start NoRedoPage filter and to update bmap for free
1681                 * of the deletd page
1682                 */
1683                lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
1684                pxdlock = (struct pxd_lock *) & tlck->lock;
1685                *pxd = pxdlock->pxd;
1686                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1687
1688                /* a maplock for txUpdateMap() for free of the page
1689                 * has been formatted at txLock() time;
1690                 */
1691                tlck->flag |= tlckUPDATEMAP;
1692        }
1693        return;
1694}
1695
1696/*
1697 *      xtLog()
1698 *
1699 * function:    log xtree tlock and format maplock to update bmap;
1700 */
1701static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1702           struct tlock * tlck)
1703{
1704        struct inode *ip;
1705        struct metapage *mp;
1706        xtpage_t *p;
1707        struct xtlock *xtlck;
1708        struct maplock *maplock;
1709        struct xdlistlock *xadlock;
1710        struct pxd_lock *pxdlock;
1711        pxd_t *page_pxd;
1712        int next, lwm, hwm;
1713
1714        ip = tlck->ip;
1715        mp = tlck->mp;
1716
1717        /* initialize as REDOPAGE/NOREDOPAGE record format */
1718        lrd->log.redopage.type = cpu_to_le16(LOG_XTREE);
1719        lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE);
1720
1721        page_pxd = &lrd->log.redopage.pxd;
1722
1723        if (tlck->type & tlckBTROOT) {
1724                lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
1725                p = &JFS_IP(ip)->i_xtroot;
1726                if (S_ISDIR(ip->i_mode))
1727                        lrd->log.redopage.type |=
1728                            cpu_to_le16(LOG_DIR_XTREE);
1729        } else
1730                p = (xtpage_t *) mp->data;
1731        next = le16_to_cpu(p->header.nextindex);
1732
1733        xtlck = (struct xtlock *) & tlck->lock;
1734
1735        maplock = (struct maplock *) & tlck->lock;
1736        xadlock = (struct xdlistlock *) maplock;
1737
1738        /*
1739         *      entry insertion/extension;
1740         *      sibling page link update (old right page before split);
1741         */
1742        if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) {
1743                /* log after-image for logredo():
1744                 * logredo() will update bmap for alloc of new/extended
1745                 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1746                 * after-image of XADlist;
1747                 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1748                 * applying the after-image to the meta-data page.
1749                 */
1750                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1751                PXDaddress(page_pxd, mp->index);
1752                PXDlength(page_pxd,
1753                          mp->logical_size >> tblk->sb->s_blocksize_bits);
1754                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1755
1756                /* format a maplock for txUpdateMap() to update bPMAP
1757                 * for alloc of new/extended extents of XAD[lwm:next)
1758                 * from the page itself;
1759                 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
1760                 */
1761                lwm = xtlck->lwm.offset;
1762                if (lwm == 0)
1763                        lwm = XTPAGEMAXSLOT;
1764
1765                if (lwm == next)
1766                        goto out;
1767                if (lwm > next) {
1768                        jfs_err("xtLog: lwm > next\n");
1769                        goto out;
1770                }
1771                tlck->flag |= tlckUPDATEMAP;
1772                xadlock->flag = mlckALLOCXADLIST;
1773                xadlock->count = next - lwm;
1774                if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
1775                        int i;
1776                        pxd_t *pxd;
1777                        /*
1778                         * Lazy commit may allow xtree to be modified before
1779                         * txUpdateMap runs.  Copy xad into linelock to
1780                         * preserve correct data.
1781                         *
1782                         * We can fit twice as may pxd's as xads in the lock
1783                         */
1784                        xadlock->flag = mlckALLOCPXDLIST;
1785                        pxd = xadlock->xdlist = &xtlck->pxdlock;
1786                        for (i = 0; i < xadlock->count; i++) {
1787                                PXDaddress(pxd, addressXAD(&p->xad[lwm + i]));
1788                                PXDlength(pxd, lengthXAD(&p->xad[lwm + i]));
1789                                p->xad[lwm + i].flag &=
1790                                    ~(XAD_NEW | XAD_EXTENDED);
1791                                pxd++;
1792                        }
1793                } else {
1794                        /*
1795                         * xdlist will point to into inode's xtree, ensure
1796                         * that transaction is not committed lazily.
1797                         */
1798                        xadlock->flag = mlckALLOCXADLIST;
1799                        xadlock->xdlist = &p->xad[lwm];
1800                        tblk->xflag &= ~COMMIT_LAZY;
1801                }
1802                jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d "
1803                         "count:%d", tlck->ip, mp, tlck, lwm, xadlock->count);
1804
1805                maplock->index = 1;
1806
1807              out:
1808                /* mark page as homeward bound */
1809                tlck->flag |= tlckWRITEPAGE;
1810
1811                return;
1812        }
1813
1814        /*
1815         *      page deletion: file deletion/truncation (ref. xtTruncate())
1816         *
1817         * (page will be invalidated after log is written and bmap
1818         * is updated from the page);
1819         */
1820        if (tlck->type & tlckFREE) {
1821                /* LOG_NOREDOPAGE log for NoRedoPage filter:
1822                 * if page free from file delete, NoRedoFile filter from
1823                 * inode image of zero link count will subsume NoRedoPage
1824                 * filters for each page;
1825                 * if page free from file truncattion, write NoRedoPage
1826                 * filter;
1827                 *
1828                 * upadte of block allocation map for the page itself:
1829                 * if page free from deletion and truncation, LOG_UPDATEMAP
1830                 * log for the page itself is generated from processing
1831                 * its parent page xad entries;
1832                 */
1833                /* if page free from file truncation, log LOG_NOREDOPAGE
1834                 * of the deleted page for logredo() to start NoRedoPage
1835                 * filter for the page;
1836                 */
1837                if (tblk->xflag & COMMIT_TRUNCATE) {
1838                        /* write NOREDOPAGE for the page */
1839                        lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
1840                        PXDaddress(page_pxd, mp->index);
1841                        PXDlength(page_pxd,
1842                                  mp->logical_size >> tblk->sb->
1843                                  s_blocksize_bits);
1844                        lrd->backchain =
1845                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1846
1847                        if (tlck->type & tlckBTROOT) {
1848                                /* Empty xtree must be logged */
1849                                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1850                                lrd->backchain =
1851                                    cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1852                        }
1853                }
1854
1855                /* init LOG_UPDATEMAP of the freed extents
1856                 * XAD[XTENTRYSTART:hwm) from the deleted page itself
1857                 * for logredo() to update bmap;
1858                 */
1859                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1860                lrd->log.updatemap.type = cpu_to_le16(LOG_FREEXADLIST);
1861                xtlck = (struct xtlock *) & tlck->lock;
1862                hwm = xtlck->hwm.offset;
1863                lrd->log.updatemap.nxd =
1864                    cpu_to_le16(hwm - XTENTRYSTART + 1);
1865                /* reformat linelock for lmLog() */
1866                xtlck->header.offset = XTENTRYSTART;
1867                xtlck->header.length = hwm - XTENTRYSTART + 1;
1868                xtlck->index = 1;
1869                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1870
1871                /* format a maplock for txUpdateMap() to update bmap
1872                 * to free extents of XAD[XTENTRYSTART:hwm) from the
1873                 * deleted page itself;
1874                 */
1875                tlck->flag |= tlckUPDATEMAP;
1876                xadlock->count = hwm - XTENTRYSTART + 1;
1877                if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
1878                        int i;
1879                        pxd_t *pxd;
1880                        /*
1881                         * Lazy commit may allow xtree to be modified before
1882                         * txUpdateMap runs.  Copy xad into linelock to
1883                         * preserve correct data.
1884                         *
1885                         * We can fit twice as may pxd's as xads in the lock
1886                         */
1887                        xadlock->flag = mlckFREEPXDLIST;
1888                        pxd = xadlock->xdlist = &xtlck->pxdlock;
1889                        for (i = 0; i < xadlock->count; i++) {
1890                                PXDaddress(pxd,
1891                                        addressXAD(&p->xad[XTENTRYSTART + i]));
1892                                PXDlength(pxd,
1893                                        lengthXAD(&p->xad[XTENTRYSTART + i]));
1894                                pxd++;
1895                        }
1896                } else {
1897                        /*
1898                         * xdlist will point to into inode's xtree, ensure
1899                         * that transaction is not committed lazily.
1900                         */
1901                        xadlock->flag = mlckFREEXADLIST;
1902                        xadlock->xdlist = &p->xad[XTENTRYSTART];
1903                        tblk->xflag &= ~COMMIT_LAZY;
1904                }
1905                jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2",
1906                         tlck->ip, mp, xadlock->count);
1907
1908                maplock->index = 1;
1909
1910                /* mark page as invalid */
1911                if (((tblk->xflag & COMMIT_PWMAP) || S_ISDIR(ip->i_mode))
1912                    && !(tlck->type & tlckBTROOT))
1913                        tlck->flag |= tlckFREEPAGE;
1914                /*
1915                   else (tblk->xflag & COMMIT_PMAP)
1916                   ? release the page;
1917                 */
1918                return;
1919        }
1920
1921        /*
1922         *      page/entry truncation: file truncation (ref. xtTruncate())
1923         *
1924         *      |----------+------+------+---------------|
1925         *                 |      |      |
1926         *                 |      |     hwm - hwm before truncation
1927         *                 |     next - truncation point
1928         *                lwm - lwm before truncation
1929         * header ?
1930         */
1931        if (tlck->type & tlckTRUNCATE) {
1932                /* This odd declaration suppresses a bogus gcc warning */
1933                pxd_t pxd = pxd;        /* truncated extent of xad */
1934                int twm;
1935
1936                /*
1937                 * For truncation the entire linelock may be used, so it would
1938                 * be difficult to store xad list in linelock itself.
1939                 * Therefore, we'll just force transaction to be committed
1940                 * synchronously, so that xtree pages won't be changed before
1941                 * txUpdateMap runs.
1942                 */
1943                tblk->xflag &= ~COMMIT_LAZY;
1944                lwm = xtlck->lwm.offset;
1945                if (lwm == 0)
1946                        lwm = XTPAGEMAXSLOT;
1947                hwm = xtlck->hwm.offset;
1948                twm = xtlck->twm.offset;
1949
1950                /*
1951                 *      write log records
1952                 */
1953                /* log after-image for logredo():
1954                 *
1955                 * logredo() will update bmap for alloc of new/extended
1956                 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1957                 * after-image of XADlist;
1958                 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1959                 * applying the after-image to the meta-data page.
1960                 */
1961                lrd->type = cpu_to_le16(LOG_REDOPAGE);
1962                PXDaddress(page_pxd, mp->index);
1963                PXDlength(page_pxd,
1964                          mp->logical_size >> tblk->sb->s_blocksize_bits);
1965                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1966
1967                /*
1968                 * truncate entry XAD[twm == next - 1]:
1969                 */
1970                if (twm == next - 1) {
1971                        /* init LOG_UPDATEMAP for logredo() to update bmap for
1972                         * free of truncated delta extent of the truncated
1973                         * entry XAD[next - 1]:
1974                         * (xtlck->pxdlock = truncated delta extent);
1975                         */
1976                        pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
1977                        /* assert(pxdlock->type & tlckTRUNCATE); */
1978                        lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1979                        lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
1980                        lrd->log.updatemap.nxd = cpu_to_le16(1);
1981                        lrd->log.updatemap.pxd = pxdlock->pxd;
1982                        pxd = pxdlock->pxd;     /* save to format maplock */
1983                        lrd->backchain =
1984                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1985                }
1986
1987                /*
1988                 * free entries XAD[next:hwm]:
1989                 */
1990                if (hwm >= next) {
1991                        /* init LOG_UPDATEMAP of the freed extents
1992                         * XAD[next:hwm] from the deleted page itself
1993                         * for logredo() to update bmap;
1994                         */
1995                        lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1996                        lrd->log.updatemap.type =
1997                            cpu_to_le16(LOG_FREEXADLIST);
1998                        xtlck = (struct xtlock *) & tlck->lock;
1999                        hwm = xtlck->hwm.offset;
2000                        lrd->log.updatemap.nxd =
2001                            cpu_to_le16(hwm - next + 1);
2002                        /* reformat linelock for lmLog() */
2003                        xtlck->header.offset = next;
2004                        xtlck->header.length = hwm - next + 1;
2005                        xtlck->index = 1;
2006                        lrd->backchain =
2007                            cpu_to_le32(lmLog(log, tblk, lrd, tlck));
2008                }
2009
2010                /*
2011                 *      format maplock(s) for txUpdateMap() to update bmap
2012                 */
2013                maplock->index = 0;
2014
2015                /*
2016                 * allocate entries XAD[lwm:next):
2017                 */
2018                if (lwm < next) {
2019                        /* format a maplock for txUpdateMap() to update bPMAP
2020                         * for alloc of new/extended extents of XAD[lwm:next)
2021                         * from the page itself;
2022                         * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
2023                         */
2024                        tlck->flag |= tlckUPDATEMAP;
2025                        xadlock->flag = mlckALLOCXADLIST;
2026                        xadlock->count = next - lwm;
2027                        xadlock->xdlist = &p->xad[lwm];
2028
2029                        jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d "
2030                                 "lwm:%d next:%d",
2031                                 tlck->ip, mp, xadlock->count, lwm, next);
2032                        maplock->index++;
2033                        xadlock++;
2034                }
2035
2036                /*
2037                 * truncate entry XAD[twm == next - 1]:
2038                 */
2039                if (twm == next - 1) {
2040                        /* format a maplock for txUpdateMap() to update bmap
2041                         * to free truncated delta extent of the truncated
2042                         * entry XAD[next - 1];
2043                         * (xtlck->pxdlock = truncated delta extent);
2044                         */
2045                        tlck->flag |= tlckUPDATEMAP;
2046                        pxdlock = (struct pxd_lock *) xadlock;
2047                        pxdlock->flag = mlckFREEPXD;
2048                        pxdlock->count = 1;
2049                        pxdlock->pxd = pxd;
2050
2051                        jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d "
2052                                 "hwm:%d", ip, mp, pxdlock->count, hwm);
2053                        maplock->index++;
2054                        xadlock++;
2055                }
2056
2057                /*
2058                 * free entries XAD[next:hwm]:
2059                 */
2060                if (hwm >= next) {
2061                        /* format a maplock for txUpdateMap() to update bmap
2062                         * to free extents of XAD[next:hwm] from thedeleted
2063                         * page itself;
2064                         */
2065                        tlck->flag |= tlckUPDATEMAP;
2066                        xadlock->flag = mlckFREEXADLIST;
2067                        xadlock->count = hwm - next + 1;
2068                        xadlock->xdlist = &p->xad[next];
2069
2070                        jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d "
2071                                 "next:%d hwm:%d",
2072                                 tlck->ip, mp, xadlock->count, next, hwm);
2073                        maplock->index++;
2074                }
2075
2076                /* mark page as homeward bound */
2077                tlck->flag |= tlckWRITEPAGE;
2078        }
2079        return;
2080}
2081
2082/*
2083 *      mapLog()
2084 *
2085 * function:    log from maplock of freed data extents;
2086 */
2087static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
2088                   struct tlock * tlck)
2089{
2090        struct pxd_lock *pxdlock;
2091        int i, nlock;
2092        pxd_t *pxd;
2093
2094        /*
2095         *      page relocation: free the source page extent
2096         *
2097         * a maplock for txUpdateMap() for free of the page
2098         * has been formatted at txLock() time saving the src
2099         * relocated page address;
2100         */
2101        if (tlck->type & tlckRELOCATE) {
2102                /* log LOG_NOREDOPAGE of the old relocated page
2103                 * for logredo() to start NoRedoPage filter;
2104                 */
2105                lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
2106                pxdlock = (struct pxd_lock *) & tlck->lock;
2107                pxd = &lrd->log.redopage.pxd;
2108                *pxd = pxdlock->pxd;
2109                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2110
2111                /* (N.B. currently, logredo() does NOT update bmap
2112                 * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
2113                 * if page free from relocation, LOG_UPDATEMAP log is
2114                 * specifically generated now for logredo()
2115                 * to update bmap for free of src relocated page;
2116                 * (new flag LOG_RELOCATE may be introduced which will
2117                 * inform logredo() to start NORedoPage filter and also
2118                 * update block allocation map at the same time, thus
2119                 * avoiding an extra log write);
2120                 */
2121                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
2122                lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
2123                lrd->log.updatemap.nxd = cpu_to_le16(1);
2124                lrd->log.updatemap.pxd = pxdlock->pxd;
2125                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2126
2127                /* a maplock for txUpdateMap() for free of the page
2128                 * has been formatted at txLock() time;
2129                 */
2130                tlck->flag |= tlckUPDATEMAP;
2131                return;
2132        }
2133        /*
2134
2135         * Otherwise it's not a relocate request
2136         *
2137         */
2138        else {
2139                /* log LOG_UPDATEMAP for logredo() to update bmap for
2140                 * free of truncated/relocated delta extent of the data;
2141                 * e.g.: external EA extent, relocated/truncated extent
2142                 * from xtTailgate();
2143                 */
2144                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
2145                pxdlock = (struct pxd_lock *) & tlck->lock;
2146                nlock = pxdlock->index;
2147                for (i = 0; i < nlock; i++, pxdlock++) {
2148                        if (pxdlock->flag & mlckALLOCPXD)
2149                                lrd->log.updatemap.type =
2150                                    cpu_to_le16(LOG_ALLOCPXD);
2151                        else
2152                                lrd->log.updatemap.type =
2153                                    cpu_to_le16(LOG_FREEPXD);
2154                        lrd->log.updatemap.nxd = cpu_to_le16(1);
2155                        lrd->log.updatemap.pxd = pxdlock->pxd;
2156                        lrd->backchain =
2157                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2158                        jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
2159                                 (ulong) addressPXD(&pxdlock->pxd),
2160                                 lengthPXD(&pxdlock->pxd));
2161                }
2162
2163                /* update bmap */
2164                tlck->flag |= tlckUPDATEMAP;
2165        }
2166}
2167
2168/*
2169 *      txEA()
2170 *
2171 * function:    acquire maplock for EA/ACL extents or
2172 *              set COMMIT_INLINE flag;
2173 */
2174void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea)
2175{
2176        struct tlock *tlck = NULL;
2177        struct pxd_lock *maplock = NULL, *pxdlock = NULL;
2178
2179        /*
2180         * format maplock for alloc of new EA extent
2181         */
2182        if (newea) {
2183                /* Since the newea could be a completely zeroed entry we need to
2184                 * check for the two flags which indicate we should actually
2185                 * commit new EA data
2186                 */
2187                if (newea->flag & DXD_EXTENT) {
2188                        tlck = txMaplock(tid, ip, tlckMAP);
2189                        maplock = (struct pxd_lock *) & tlck->lock;
2190                        pxdlock = (struct pxd_lock *) maplock;
2191                        pxdlock->flag = mlckALLOCPXD;
2192                        PXDaddress(&pxdlock->pxd, addressDXD(newea));
2193                        PXDlength(&pxdlock->pxd, lengthDXD(newea));
2194                        pxdlock++;
2195                        maplock->index = 1;
2196                } else if (newea->flag & DXD_INLINE) {
2197                        tlck = NULL;
2198
2199                        set_cflag(COMMIT_Inlineea, ip);
2200                }
2201        }
2202
2203        /*
2204         * format maplock for free of old EA extent
2205         */
2206        if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) {
2207                if (tlck == NULL) {
2208                        tlck = txMaplock(tid, ip, tlckMAP);
2209                        maplock = (struct pxd_lock *) & tlck->lock;
2210                        pxdlock = (struct pxd_lock *) maplock;
2211                        maplock->index = 0;
2212                }
2213                pxdlock->flag = mlckFREEPXD;
2214                PXDaddress(&pxdlock->pxd, addressDXD(oldea));
2215                PXDlength(&pxdlock->pxd, lengthDXD(oldea));
2216                maplock->index++;
2217        }
2218}
2219
2220/*
2221 *      txForce()
2222 *
2223 * function: synchronously write pages locked by transaction
2224 *           after txLog() but before txUpdateMap();
2225 */
2226static void txForce(struct tblock * tblk)
2227{
2228        struct tlock *tlck;
2229        lid_t lid, next;
2230        struct metapage *mp;
2231
2232        /*
2233         * reverse the order of transaction tlocks in
2234         * careful update order of address index pages
2235         * (right to left, bottom up)
2236         */
2237        tlck = lid_to_tlock(tblk->next);
2238        lid = tlck->next;
2239        tlck->next = 0;
2240        while (lid) {
2241                tlck = lid_to_tlock(lid);
2242                next = tlck->next;
2243                tlck->next = tblk->next;
2244                tblk->next = lid;
2245                lid = next;
2246        }
2247
2248        /*
2249         * synchronously write the page, and
2250         * hold the page for txUpdateMap();
2251         */
2252        for (lid = tblk->next; lid; lid = next) {
2253                tlck = lid_to_tlock(lid);
2254                next = tlck->next;
2255
2256                if ((mp = tlck->mp) != NULL &&
2257                    (tlck->type & tlckBTROOT) == 0) {
2258                        assert(mp->xflag & COMMIT_PAGE);
2259
2260                        if (tlck->flag & tlckWRITEPAGE) {
2261                                tlck->flag &= ~tlckWRITEPAGE;
2262
2263                                /* do not release page to freelist */
2264                                force_metapage(mp);
2265#if 0
2266                                /*
2267                                 * The "right" thing to do here is to
2268                                 * synchronously write the metadata.
2269                                 * With the current implementation this
2270                                 * is hard since write_metapage requires
2271                                 * us to kunmap & remap the page.  If we
2272                                 * have tlocks pointing into the metadata
2273                                 * pages, we don't want to do this.  I think
2274                                 * we can get by with synchronously writing
2275                                 * the pages when they are released.
2276                                 */
2277                                assert(mp->nohomeok);
2278                                set_bit(META_dirty, &mp->flag);
2279                                set_bit(META_sync, &mp->flag);
2280#endif
2281                        }
2282                }
2283        }
2284}
2285
2286/*
2287 *      txUpdateMap()
2288 *
2289 * function:    update persistent allocation map (and working map
2290 *              if appropriate);
2291 *
2292 * parameter:
2293 */
2294static void txUpdateMap(struct tblock * tblk)
2295{
2296        struct inode *ip;
2297        struct inode *ipimap;
2298        lid_t lid;
2299        struct tlock *tlck;
2300        struct maplock *maplock;
2301        struct pxd_lock pxdlock;
2302        int maptype;
2303        int k, nlock;
2304        struct metapage *mp = NULL;
2305
2306        ipimap = JFS_SBI(tblk->sb)->ipimap;
2307
2308        maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP;
2309
2310
2311        /*
2312         *      update block allocation map
2313         *
2314         * update allocation state in pmap (and wmap) and
2315         * update lsn of the pmap page;
2316         */
2317        /*
2318         * scan each tlock/page of transaction for block allocation/free:
2319         *
2320         * for each tlock/page of transaction, update map.
2321         *  ? are there tlock for pmap and pwmap at the same time ?
2322         */
2323        for (lid = tblk->next; lid; lid = tlck->next) {
2324                tlck = lid_to_tlock(lid);
2325
2326                if ((tlck->flag & tlckUPDATEMAP) == 0)
2327                        continue;
2328
2329                if (tlck->flag & tlckFREEPAGE) {
2330                        /*
2331                         * Another thread may attempt to reuse freed space
2332                         * immediately, so we want to get rid of the metapage
2333                         * before anyone else has a chance to get it.
2334                         * Lock metapage, update maps, then invalidate
2335                         * the metapage.
2336                         */
2337                        mp = tlck->mp;
2338                        ASSERT(mp->xflag & COMMIT_PAGE);
2339                        grab_metapage(mp);
2340                }
2341
2342                /*
2343                 * extent list:
2344                 * . in-line PXD list:
2345                 * . out-of-line XAD list:
2346                 */
2347                maplock = (struct maplock *) & tlck->lock;
2348                nlock = maplock->index;
2349
2350                for (k = 0; k < nlock; k++, maplock++) {
2351                        /*
2352                         * allocate blocks in persistent map:
2353                         *
2354                         * blocks have been allocated from wmap at alloc time;
2355                         */
2356                        if (maplock->flag & mlckALLOC) {
2357                                txAllocPMap(ipimap, maplock, tblk);
2358                        }
2359                        /*
2360                         * free blocks in persistent and working map:
2361                         * blocks will be freed in pmap and then in wmap;
2362                         *
2363                         * ? tblock specifies the PMAP/PWMAP based upon
2364                         * transaction
2365                         *
2366                         * free blocks in persistent map:
2367                         * blocks will be freed from wmap at last reference
2368                         * release of the object for regular files;
2369                         *
2370                         * Alway free blocks from both persistent & working
2371                         * maps for directories
2372                         */
2373                        else {  /* (maplock->flag & mlckFREE) */
2374
2375                                if (tlck->flag & tlckDIRECTORY)
2376                                        txFreeMap(ipimap, maplock,
2377                                                  tblk, COMMIT_PWMAP);
2378                                else
2379                                        txFreeMap(ipimap, maplock,
2380                                                  tblk, maptype);
2381                        }
2382                }
2383                if (tlck->flag & tlckFREEPAGE) {
2384                        if (!(tblk->flag & tblkGC_LAZY)) {
2385                                /* This is equivalent to txRelease */
2386                                ASSERT(mp->lid == lid);
2387                                tlck->mp->lid = 0;
2388                        }
2389                        assert(mp->nohomeok == 1);
2390                        metapage_homeok(mp);
2391                        discard_metapage(mp);
2392                        tlck->mp = NULL;
2393                }
2394        }
2395        /*
2396         *      update inode allocation map
2397         *
2398         * update allocation state in pmap and
2399         * update lsn of the pmap page;
2400         * update in-memory inode flag/state
2401         *
2402         * unlock mapper/write lock
2403         */
2404        if (tblk->xflag & COMMIT_CREATE) {
2405                diUpdatePMap(ipimap, tblk->ino, false, tblk);
2406                /* update persistent block allocation map
2407                 * for the allocation of inode extent;
2408                 */
2409                pxdlock.flag = mlckALLOCPXD;
2410                pxdlock.pxd = tblk->u.ixpxd;
2411                pxdlock.index = 1;
2412                txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk);
2413        } else if (tblk->xflag & COMMIT_DELETE) {
2414                ip = tblk->u.ip;
2415                diUpdatePMap(ipimap, ip->i_ino, true, tblk);
2416                iput(ip);
2417        }
2418}
2419
2420/*
2421 *      txAllocPMap()
2422 *
2423 * function: allocate from persistent map;
2424 *
2425 * parameter:
2426 *      ipbmap  -
2427 *      malock  -
2428 *              xad list:
2429 *              pxd:
2430 *
2431 *      maptype -
2432 *              allocate from persistent map;
2433 *              free from persistent map;
2434 *              (e.g., tmp file - free from working map at releae
2435 *               of last reference);
2436 *              free from persistent and working map;
2437 *
2438 *      lsn     - log sequence number;
2439 */
2440static void txAllocPMap(struct inode *ip, struct maplock * maplock,
2441                        struct tblock * tblk)
2442{
2443        struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
2444        struct xdlistlock *xadlistlock;
2445        xad_t *xad;
2446        s64 xaddr;
2447        int xlen;
2448        struct pxd_lock *pxdlock;
2449        struct xdlistlock *pxdlistlock;
2450        pxd_t *pxd;
2451        int n;
2452
2453        /*
2454         * allocate from persistent map;
2455         */
2456        if (maplock->flag & mlckALLOCXADLIST) {
2457                xadlistlock = (struct xdlistlock *) maplock;
2458                xad = xadlistlock->xdlist;
2459                for (n = 0; n < xadlistlock->count; n++, xad++) {
2460                        if (xad->flag & (XAD_NEW | XAD_EXTENDED)) {
2461                                xaddr = addressXAD(xad);
2462                                xlen = lengthXAD(xad);
2463                                dbUpdatePMap(ipbmap, false, xaddr,
2464                                             (s64) xlen, tblk);
2465                                xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
2466                                jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2467                                         (ulong) xaddr, xlen);
2468                        }
2469                }
2470        } else if (maplock->flag & mlckALLOCPXD) {
2471                pxdlock = (struct pxd_lock *) maplock;
2472                xaddr = addressPXD(&pxdlock->pxd);
2473                xlen = lengthPXD(&pxdlock->pxd);
2474                dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk);
2475                jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen);
2476        } else {                /* (maplock->flag & mlckALLOCPXDLIST) */
2477
2478                pxdlistlock = (struct xdlistlock *) maplock;
2479                pxd = pxdlistlock->xdlist;
2480                for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2481                        xaddr = addressPXD(pxd);
2482                        xlen = lengthPXD(pxd);
2483                        dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen,
2484                                     tblk);
2485                        jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2486                                 (ulong) xaddr, xlen);
2487                }
2488        }
2489}
2490
2491/*
2492 *      txFreeMap()
2493 *
2494 * function:    free from persistent and/or working map;
2495 *
2496 * todo: optimization
2497 */
2498void txFreeMap(struct inode *ip,
2499               struct maplock * maplock, struct tblock * tblk, int maptype)
2500{
2501        struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
2502        struct xdlistlock *xadlistlock;
2503        xad_t *xad;
2504        s64 xaddr;
2505        int xlen;
2506        struct pxd_lock *pxdlock;
2507        struct xdlistlock *pxdlistlock;
2508        pxd_t *pxd;
2509        int n;
2510
2511        jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
2512                 tblk, maplock, maptype);
2513
2514        /*
2515         * free from persistent map;
2516         */
2517        if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) {
2518                if (maplock->flag & mlckFREEXADLIST) {
2519                        xadlistlock = (struct xdlistlock *) maplock;
2520                        xad = xadlistlock->xdlist;
2521                        for (n = 0; n < xadlistlock->count; n++, xad++) {
2522                                if (!(xad->flag & XAD_NEW)) {
2523                                        xaddr = addressXAD(xad);
2524                                        xlen = lengthXAD(xad);
2525                                        dbUpdatePMap(ipbmap, true, xaddr,
2526                                                     (s64) xlen, tblk);
2527                                        jfs_info("freePMap: xaddr:0x%lx "
2528                                                 "xlen:%d",
2529                                                 (ulong) xaddr, xlen);
2530                                }
2531                        }
2532                } else if (maplock->flag & mlckFREEPXD) {
2533                        pxdlock = (struct pxd_lock *) maplock;
2534                        xaddr = addressPXD(&pxdlock->pxd);
2535                        xlen = lengthPXD(&pxdlock->pxd);
2536                        dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen,
2537                                     tblk);
2538                        jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2539                                 (ulong) xaddr, xlen);
2540                } else {        /* (maplock->flag & mlckALLOCPXDLIST) */
2541
2542                        pxdlistlock = (struct xdlistlock *) maplock;
2543                        pxd = pxdlistlock->xdlist;
2544                        for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2545                                xaddr = addressPXD(pxd);
2546                                xlen = lengthPXD(pxd);
2547                                dbUpdatePMap(ipbmap, true, xaddr,
2548                                             (s64) xlen, tblk);
2549                                jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2550                                         (ulong) xaddr, xlen);
2551                        }
2552                }
2553        }
2554
2555        /*
2556         * free from working map;
2557         */
2558        if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) {
2559                if (maplock->flag & mlckFREEXADLIST) {
2560                        xadlistlock = (struct xdlistlock *) maplock;
2561                        xad = xadlistlock->xdlist;
2562                        for (n = 0; n < xadlistlock->count; n++, xad++) {
2563                                xaddr = addressXAD(xad);
2564                                xlen = lengthXAD(xad);
2565                                dbFree(ip, xaddr, (s64) xlen);
2566                                xad->flag = 0;
2567                                jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2568                                         (ulong) xaddr, xlen);
2569                        }
2570                } else if (maplock->flag & mlckFREEPXD) {
2571                        pxdlock = (struct pxd_lock *) maplock;
2572                        xaddr = addressPXD(&pxdlock->pxd);
2573                        xlen = lengthPXD(&pxdlock->pxd);
2574                        dbFree(ip, xaddr, (s64) xlen);
2575                        jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2576                                 (ulong) xaddr, xlen);
2577                } else {        /* (maplock->flag & mlckFREEPXDLIST) */
2578
2579                        pxdlistlock = (struct xdlistlock *) maplock;
2580                        pxd = pxdlistlock->xdlist;
2581                        for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2582                                xaddr = addressPXD(pxd);
2583                                xlen = lengthPXD(pxd);
2584                                dbFree(ip, xaddr, (s64) xlen);
2585                                jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2586                                         (ulong) xaddr, xlen);
2587                        }
2588                }
2589        }
2590}
2591
2592/*
2593 *      txFreelock()
2594 *
2595 * function:    remove tlock from inode anonymous locklist
2596 */
2597void txFreelock(struct inode *ip)
2598{
2599        struct jfs_inode_info *jfs_ip = JFS_IP(ip);
2600        struct tlock *xtlck, *tlck;
2601        lid_t xlid = 0, lid;
2602
2603        if (!jfs_ip->atlhead)
2604                return;
2605
2606        TXN_LOCK();
2607        xtlck = (struct tlock *) &jfs_ip->atlhead;
2608
2609        while ((lid = xtlck->next) != 0) {
2610                tlck = lid_to_tlock(lid);
2611                if (tlck->flag & tlckFREELOCK) {
2612                        xtlck->next = tlck->next;
2613                        txLockFree(lid);
2614                } else {
2615                        xtlck = tlck;
2616                        xlid = lid;
2617                }
2618        }
2619
2620        if (jfs_ip->atlhead)
2621                jfs_ip->atltail = xlid;
2622        else {
2623                jfs_ip->atltail = 0;
2624                /*
2625                 * If inode was on anon_list, remove it
2626                 */
2627                list_del_init(&jfs_ip->anon_inode_list);
2628        }
2629        TXN_UNLOCK();
2630}
2631
2632/*
2633 *      txAbort()
2634 *
2635 * function: abort tx before commit;
2636 *
2637 * frees line-locks and segment locks for all
2638 * segments in comdata structure.
2639 * Optionally sets state of file-system to FM_DIRTY in super-block.
2640 * log age of page-frames in memory for which caller has
2641 * are reset to 0 (to avoid logwarap).
2642 */
2643void txAbort(tid_t tid, int dirty)
2644{
2645        lid_t lid, next;
2646        struct metapage *mp;
2647        struct tblock *tblk = tid_to_tblock(tid);
2648        struct tlock *tlck;
2649
2650        /*
2651         * free tlocks of the transaction
2652         */
2653        for (lid = tblk->next; lid; lid = next) {
2654                tlck = lid_to_tlock(lid);
2655                next = tlck->next;
2656                mp = tlck->mp;
2657                JFS_IP(tlck->ip)->xtlid = 0;
2658
2659                if (mp) {
2660                        mp->lid = 0;
2661
2662                        /*
2663                         * reset lsn of page to avoid logwarap:
2664                         *
2665                         * (page may have been previously committed by another
2666                         * transaction(s) but has not been paged, i.e.,
2667                         * it may be on logsync list even though it has not
2668                         * been logged for the current tx.)
2669                         */
2670                        if (mp->xflag & COMMIT_PAGE && mp->lsn)
2671                                LogSyncRelease(mp);
2672                }
2673                /* insert tlock at head of freelist */
2674                TXN_LOCK();
2675                txLockFree(lid);
2676                TXN_UNLOCK();
2677        }
2678
2679        /* caller will free the transaction block */
2680
2681        tblk->next = tblk->last = 0;
2682
2683        /*
2684         * mark filesystem dirty
2685         */
2686        if (dirty)
2687                jfs_error(tblk->sb, "txAbort");
2688
2689        return;
2690}
2691
2692/*
2693 *      txLazyCommit(void)
2694 *
2695 *      All transactions except those changing ipimap (COMMIT_FORCE) are
2696 *      processed by this routine.  This insures that the inode and block
2697 *      allocation maps are updated in order.  For synchronous transactions,
2698 *      let the user thread finish processing after txUpdateMap() is called.
2699 */
2700static void txLazyCommit(struct tblock * tblk)
2701{
2702        struct jfs_log *log;
2703
2704        while (((tblk->flag & tblkGC_READY) == 0) &&
2705               ((tblk->flag & tblkGC_UNLOCKED) == 0)) {
2706                /* We must have gotten ahead of the user thread
2707                 */
2708                jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk);
2709                yield();
2710        }
2711
2712        jfs_info("txLazyCommit: processing tblk 0x%p", tblk);
2713
2714        txUpdateMap(tblk);
2715
2716        log = (struct jfs_log *) JFS_SBI(tblk->sb)->log;
2717
2718        spin_lock_irq(&log->gclock);    // LOGGC_LOCK
2719
2720        tblk->flag |= tblkGC_COMMITTED;
2721
2722        if (tblk->flag & tblkGC_READY)
2723                log->gcrtc--;
2724
2725        wake_up_all(&tblk->gcwait);     // LOGGC_WAKEUP
2726
2727        /*
2728         * Can't release log->gclock until we've tested tblk->flag
2729         */
2730        if (tblk->flag & tblkGC_LAZY) {
2731                spin_unlock_irq(&log->gclock);  // LOGGC_UNLOCK
2732                txUnlock(tblk);
2733                tblk->flag &= ~tblkGC_LAZY;
2734                txEnd(tblk - TxBlock);  /* Convert back to tid */
2735        } else
2736                spin_unlock_irq(&log->gclock);  // LOGGC_UNLOCK
2737
2738        jfs_info("txLazyCommit: done: tblk = 0x%p", tblk);
2739}
2740
2741/*
2742 *      jfs_lazycommit(void)
2743 *
2744 *      To be run as a kernel daemon.  If lbmIODone is called in an interrupt
2745 *      context, or where blocking is not wanted, this routine will process
2746 *      committed transactions from the unlock queue.
2747 */
2748int jfs_lazycommit(void *arg)
2749{
2750        int WorkDone;
2751        struct tblock *tblk;
2752        unsigned long flags;
2753        struct jfs_sb_info *sbi;
2754
2755        do {
2756                LAZY_LOCK(flags);
2757                jfs_commit_thread_waking = 0;   /* OK to wake another thread */
2758                while (!list_empty(&TxAnchor.unlock_queue)) {
2759                        WorkDone = 0;
2760                        list_for_each_entry(tblk, &TxAnchor.unlock_queue,
2761                                            cqueue) {
2762
2763                                sbi = JFS_SBI(tblk->sb);
2764                                /*
2765                                 * For each volume, the transactions must be
2766                                 * handled in order.  If another commit thread
2767                                 * is handling a tblk for this superblock,
2768                                 * skip it
2769                                 */
2770                                if (sbi->commit_state & IN_LAZYCOMMIT)
2771                                        continue;
2772
2773                                sbi->commit_state |= IN_LAZYCOMMIT;
2774                                WorkDone = 1;
2775
2776                                /*
2777                                 * Remove transaction from queue
2778                                 */
2779                                list_del(&tblk->cqueue);
2780
2781                                LAZY_UNLOCK(flags);
2782                                txLazyCommit(tblk);
2783                                LAZY_LOCK(flags);
2784
2785                                sbi->commit_state &= ~IN_LAZYCOMMIT;
2786                                /*
2787                                 * Don't continue in the for loop.  (We can't
2788                                 * anyway, it's unsafe!)  We want to go back to
2789                                 * the beginning of the list.
2790                                 */
2791                                break;
2792                        }
2793
2794                        /* If there was nothing to do, don't continue */
2795                        if (!WorkDone)
2796                                break;
2797                }
2798                /* In case a wakeup came while all threads were active */
2799                jfs_commit_thread_waking = 0;
2800
2801                if (freezing(current)) {
2802                        LAZY_UNLOCK(flags);
2803                        try_to_freeze();
2804                } else {
2805                        DECLARE_WAITQUEUE(wq, current);
2806
2807                        add_wait_queue(&jfs_commit_thread_wait, &wq);
2808                        set_current_state(TASK_INTERRUPTIBLE);
2809                        LAZY_UNLOCK(flags);
2810                        schedule();
2811                        __set_current_state(TASK_RUNNING);
2812                        remove_wait_queue(&jfs_commit_thread_wait, &wq);
2813                }
2814        } while (!kthread_should_stop());
2815
2816        if (!list_empty(&TxAnchor.unlock_queue))
2817                jfs_err("jfs_lazycommit being killed w/pending transactions!");
2818        else
2819                jfs_info("jfs_lazycommit being killed\n");
2820        return 0;
2821}
2822
2823void txLazyUnlock(struct tblock * tblk)
2824{
2825        unsigned long flags;
2826
2827        LAZY_LOCK(flags);
2828
2829        list_add_tail(&tblk->cqueue, &TxAnchor.unlock_queue);
2830        /*
2831         * Don't wake up a commit thread if there is already one servicing
2832         * this superblock, or if the last one we woke up hasn't started yet.
2833         */
2834        if (!(JFS_SBI(tblk->sb)->commit_state & IN_LAZYCOMMIT) &&
2835            !jfs_commit_thread_waking) {
2836                jfs_commit_thread_waking = 1;
2837                wake_up(&jfs_commit_thread_wait);
2838        }
2839        LAZY_UNLOCK(flags);
2840}
2841
2842static void LogSyncRelease(struct metapage * mp)
2843{
2844        struct jfs_log *log = mp->log;
2845
2846        assert(mp->nohomeok);
2847        assert(log);
2848        metapage_homeok(mp);
2849}
2850
2851/*
2852 *      txQuiesce
2853 *
2854 *      Block all new transactions and push anonymous transactions to
2855 *      completion
2856 *
2857 *      This does almost the same thing as jfs_sync below.  We don't
2858 *      worry about deadlocking when jfs_tlocks_low is set, since we would
2859 *      expect jfs_sync to get us out of that jam.
2860 */
2861void txQuiesce(struct super_block *sb)
2862{
2863        struct inode *ip;
2864        struct jfs_inode_info *jfs_ip;
2865        struct jfs_log *log = JFS_SBI(sb)->log;
2866        tid_t tid;
2867
2868        set_bit(log_QUIESCE, &log->flag);
2869
2870        TXN_LOCK();
2871restart:
2872        while (!list_empty(&TxAnchor.anon_list)) {
2873                jfs_ip = list_entry(TxAnchor.anon_list.next,
2874                                    struct jfs_inode_info,
2875                                    anon_inode_list);
2876                ip = &jfs_ip->vfs_inode;
2877
2878                /*
2879                 * inode will be removed from anonymous list
2880                 * when it is committed
2881                 */
2882                TXN_UNLOCK();
2883                tid = txBegin(ip->i_sb, COMMIT_INODE | COMMIT_FORCE);
2884                mutex_lock(&jfs_ip->commit_mutex);
2885                txCommit(tid, 1, &ip, 0);
2886                txEnd(tid);
2887                mutex_unlock(&jfs_ip->commit_mutex);
2888                /*
2889                 * Just to be safe.  I don't know how
2890                 * long we can run without blocking
2891                 */
2892                cond_resched();
2893                TXN_LOCK();
2894        }
2895
2896        /*
2897         * If jfs_sync is running in parallel, there could be some inodes
2898         * on anon_list2.  Let's check.
2899         */
2900        if (!list_empty(&TxAnchor.anon_list2)) {
2901                list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list);
2902                INIT_LIST_HEAD(&TxAnchor.anon_list2);
2903                goto restart;
2904        }
2905        TXN_UNLOCK();
2906
2907        /*
2908         * We may need to kick off the group commit
2909         */
2910        jfs_flush_journal(log, 0);
2911}
2912
2913/*
2914 * txResume()
2915 *
2916 * Allows transactions to start again following txQuiesce
2917 */
2918void txResume(struct super_block *sb)
2919{
2920        struct jfs_log *log = JFS_SBI(sb)->log;
2921
2922        clear_bit(log_QUIESCE, &log->flag);
2923        TXN_WAKEUP(&log->syncwait);
2924}
2925
2926/*
2927 *      jfs_sync(void)
2928 *
2929 *      To be run as a kernel daemon.  This is awakened when tlocks run low.
2930 *      We write any inodes that have anonymous tlocks so they will become
2931 *      available.
2932 */
2933int jfs_sync(void *arg)
2934{
2935        struct inode *ip;
2936        struct jfs_inode_info *jfs_ip;
2937        tid_t tid;
2938
2939        do {
2940                /*
2941                 * write each inode on the anonymous inode list
2942                 */
2943                TXN_LOCK();
2944                while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) {
2945                        jfs_ip = list_entry(TxAnchor.anon_list.next,
2946                                            struct jfs_inode_info,
2947                                            anon_inode_list);
2948                        ip = &jfs_ip->vfs_inode;
2949
2950                        if (! igrab(ip)) {
2951                                /*
2952                                 * Inode is being freed
2953                                 */
2954                                list_del_init(&jfs_ip->anon_inode_list);
2955                        } else if (mutex_trylock(&jfs_ip->commit_mutex)) {
2956                                /*
2957                                 * inode will be removed from anonymous list
2958                                 * when it is committed
2959                                 */
2960                                TXN_UNLOCK();
2961                                tid = txBegin(ip->i_sb, COMMIT_INODE);
2962                                txCommit(tid, 1, &ip, 0);
2963                                txEnd(tid);
2964                                mutex_unlock(&jfs_ip->commit_mutex);
2965
2966                                iput(ip);
2967                                /*
2968                                 * Just to be safe.  I don't know how
2969                                 * long we can run without blocking
2970                                 */
2971                                cond_resched();
2972                                TXN_LOCK();
2973                        } else {
2974                                /* We can't get the commit mutex.  It may
2975                                 * be held by a thread waiting for tlock's
2976                                 * so let's not block here.  Save it to
2977                                 * put back on the anon_list.
2978                                 */
2979
2980                                /* Take off anon_list */
2981                                list_del(&jfs_ip->anon_inode_list);
2982
2983                                /* Put on anon_list2 */
2984                                list_add(&jfs_ip->anon_inode_list,
2985                                         &TxAnchor.anon_list2);
2986
2987                                TXN_UNLOCK();
2988                                iput(ip);
2989                                TXN_LOCK();
2990                        }
2991                }
2992                /* Add anon_list2 back to anon_list */
2993                list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
2994
2995                if (freezing(current)) {
2996                        TXN_UNLOCK();
2997                        try_to_freeze();
2998                } else {
2999                        set_current_state(TASK_INTERRUPTIBLE);
3000                        TXN_UNLOCK();
3001                        schedule();
3002                        __set_current_state(TASK_RUNNING);
3003                }
3004        } while (!kthread_should_stop());
3005
3006        jfs_info("jfs_sync being killed");
3007        return 0;
3008}
3009
3010#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
3011static int jfs_txanchor_proc_show(struct seq_file *m, void *v)
3012{
3013        char *freewait;
3014        char *freelockwait;
3015        char *lowlockwait;
3016
3017        freewait =
3018            waitqueue_active(&TxAnchor.freewait) ? "active" : "empty";
3019        freelockwait =
3020            waitqueue_active(&TxAnchor.freelockwait) ? "active" : "empty";
3021        lowlockwait =
3022            waitqueue_active(&TxAnchor.lowlockwait) ? "active" : "empty";
3023
3024        seq_printf(m,
3025                       "JFS TxAnchor\n"
3026                       "============\n"
3027                       "freetid = %d\n"
3028                       "freewait = %s\n"
3029                       "freelock = %d\n"
3030                       "freelockwait = %s\n"
3031                       "lowlockwait = %s\n"
3032                       "tlocksInUse = %d\n"
3033                       "jfs_tlocks_low = %d\n"
3034                       "unlock_queue is %sempty\n",
3035                       TxAnchor.freetid,
3036                       freewait,
3037                       TxAnchor.freelock,
3038                       freelockwait,
3039                       lowlockwait,
3040                       TxAnchor.tlocksInUse,
3041                       jfs_tlocks_low,
3042                       list_empty(&TxAnchor.unlock_queue) ? "" : "not ");
3043        return 0;
3044}
3045
3046static int jfs_txanchor_proc_open(struct inode *inode, struct file *file)
3047{
3048        return single_open(file, jfs_txanchor_proc_show, NULL);
3049}
3050
3051const struct file_operations jfs_txanchor_proc_fops = {
3052        .owner          = THIS_MODULE,
3053        .open           = jfs_txanchor_proc_open,
3054        .read           = seq_read,
3055        .llseek         = seq_lseek,
3056        .release        = single_release,
3057};
3058#endif
3059
3060#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
3061static int jfs_txstats_proc_show(struct seq_file *m, void *v)
3062{
3063        seq_printf(m,
3064                       "JFS TxStats\n"
3065                       "===========\n"
3066                       "calls to txBegin = %d\n"
3067                       "txBegin blocked by sync barrier = %d\n"
3068                       "txBegin blocked by tlocks low = %d\n"
3069                       "txBegin blocked by no free tid = %d\n"
3070                       "calls to txBeginAnon = %d\n"
3071                       "txBeginAnon blocked by sync barrier = %d\n"
3072                       "txBeginAnon blocked by tlocks low = %d\n"
3073                       "calls to txLockAlloc = %d\n"
3074                       "tLockAlloc blocked by no free lock = %d\n",
3075                       TxStat.txBegin,
3076                       TxStat.txBegin_barrier,
3077                       TxStat.txBegin_lockslow,
3078                       TxStat.txBegin_freetid,
3079                       TxStat.txBeginAnon,
3080                       TxStat.txBeginAnon_barrier,
3081                       TxStat.txBeginAnon_lockslow,
3082                       TxStat.txLockAlloc,
3083                       TxStat.txLockAlloc_freelock);
3084        return 0;
3085}
3086
3087static int jfs_txstats_proc_open(struct inode *inode, struct file *file)
3088{
3089        return single_open(file, jfs_txstats_proc_show, NULL);
3090}
3091
3092const struct file_operations jfs_txstats_proc_fops = {
3093        .owner          = THIS_MODULE,
3094        .open           = jfs_txstats_proc_open,
3095        .read           = seq_read,
3096        .llseek         = seq_lseek,
3097        .release        = single_release,
3098};
3099#endif
3100
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