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

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