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

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