ClabureDB: Classified Bug-Reports Database

   /*
    *   Copyright (C) International Business Machines Corp., 2000-2005
    *   Portions Copyright (C) Christoph Hellwig, 2001-2002
    *
    *   This program is free software;  you can redistribute it and/or modify
    *   it under the terms of the GNU General Public License as published by
    *   the Free Software Foundation; either version 2 of the License, or
    *   (at your option) any later version.
    *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program;  if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  /*
   *        jfs_txnmgr.c: transaction manager
   *
   * notes:
   * transaction starts with txBegin() and ends with txCommit()
   * or txAbort().
   *
   * tlock is acquired at the time of update;
   * (obviate scan at commit time for xtree and dtree)
   * tlock and mp points to each other;
   * (no hashlist for mp -> tlock).
   *
   * special cases:
   * tlock on in-memory inode:
   * in-place tlock in the in-memory inode itself;
   * converted to page lock by iWrite() at commit time.
   *
   * tlock during write()/mmap() under anonymous transaction (tid = 0):
   * transferred (?) to transaction at commit time.
   *
   * use the page itself to update allocation maps
   * (obviate intermediate replication of allocation/deallocation data)
   * hold on to mp+lock thru update of maps
   */
  
  #include <linux/fs.h>
  #include <linux/vmalloc.h>
  #include <linux/completion.h>
  #include <linux/freezer.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/kthread.h>
  #include <linux/seq_file.h>
  #include "jfs_incore.h"
  #include "jfs_inode.h"
  #include "jfs_filsys.h"
  #include "jfs_metapage.h"
  #include "jfs_dinode.h"
  #include "jfs_imap.h"
  #include "jfs_dmap.h"
  #include "jfs_superblock.h"
  #include "jfs_debug.h"
  
  /*
   *        transaction management structures
   */
  static struct {
          int freetid;                /* index of a free tid structure */
          int freelock;                /* index first free lock word */
          wait_queue_head_t freewait;        /* eventlist of free tblock */
          wait_queue_head_t freelockwait;        /* eventlist of free tlock */
          wait_queue_head_t lowlockwait;        /* eventlist of ample tlocks */
          int tlocksInUse;        /* Number of tlocks in use */
          spinlock_t LazyLock;        /* synchronize sync_queue & unlock_queue */
  /*        struct tblock *sync_queue; * Transactions waiting for data sync */
          struct list_head unlock_queue;        /* Txns waiting to be released */
          struct list_head anon_list;        /* inodes having anonymous txns */
          struct list_head anon_list2;        /* inodes having anonymous txns
                                             that couldn't be sync'ed */
  } TxAnchor;
  
  int jfs_tlocks_low;                /* Indicates low number of available tlocks */
  
  #ifdef CONFIG_JFS_STATISTICS
  static struct {
          uint txBegin;
          uint txBegin_barrier;
          uint txBegin_lockslow;
          uint txBegin_freetid;
          uint txBeginAnon;
          uint txBeginAnon_barrier;
          uint txBeginAnon_lockslow;
          uint txLockAlloc;
          uint txLockAlloc_freelock;
  } TxStat;
  #endif
  
  static int nTxBlock = -1;        /* number of transaction blocks */
  module_param(nTxBlock, int, 0);
  MODULE_PARM_DESC(nTxBlock,
                  "Number of transaction blocks (max:65536)");
 
 static int nTxLock = -1;        /* number of transaction locks */
 module_param(nTxLock, int, 0);
 MODULE_PARM_DESC(nTxLock,
                  "Number of transaction locks (max:65536)");
 
 struct tblock *TxBlock;        /* transaction block table */
 static int TxLockLWM;        /* Low water mark for number of txLocks used */
 static int TxLockHWM;        /* High water mark for number of txLocks used */
 static int TxLockVHWM;        /* Very High water mark */
 struct tlock *TxLock;        /* transaction lock table */
 
 /*
  *        transaction management lock
  */
 static DEFINE_SPINLOCK(jfsTxnLock);
 
 #define TXN_LOCK()                spin_lock(&jfsTxnLock)
 #define TXN_UNLOCK()                spin_unlock(&jfsTxnLock)
 
 #define LAZY_LOCK_INIT()        spin_lock_init(&TxAnchor.LazyLock);
 #define LAZY_LOCK(flags)        spin_lock_irqsave(&TxAnchor.LazyLock, flags)
 #define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
 
 static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait);
 static int jfs_commit_thread_waking;
 
 /*
  * Retry logic exist outside these macros to protect from spurrious wakeups.
  */
 static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
 {
         DECLARE_WAITQUEUE(wait, current);
 
         add_wait_queue(event, &wait);
         set_current_state(TASK_UNINTERRUPTIBLE);
         TXN_UNLOCK();
         io_schedule();
         __set_current_state(TASK_RUNNING);
         remove_wait_queue(event, &wait);
 }
 
 #define TXN_SLEEP(event)\
 {\
         TXN_SLEEP_DROP_LOCK(event);\
         TXN_LOCK();\
 }
 
 #define TXN_WAKEUP(event) wake_up_all(event)
 
 /*
  *        statistics
  */
 static struct {
         tid_t maxtid;                /* 4: biggest tid ever used */
         lid_t maxlid;                /* 4: biggest lid ever used */
         int ntid;                /* 4: # of transactions performed */
         int nlid;                /* 4: # of tlocks acquired */
         int waitlock;                /* 4: # of tlock wait */
 } stattx;
 
 /*
  * forward references
  */
 static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                 struct tlock * tlck, struct commit * cd);
 static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                 struct tlock * tlck);
 static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                 struct tlock * tlck);
 static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                 struct tlock * tlck);
 static void txAllocPMap(struct inode *ip, struct maplock * maplock,
                 struct tblock * tblk);
 static void txForce(struct tblock * tblk);
 static int txLog(struct jfs_log * log, struct tblock * tblk,
                 struct commit * cd);
 static void txUpdateMap(struct tblock * tblk);
 static void txRelease(struct tblock * tblk);
 static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
            struct tlock * tlck);
 static void LogSyncRelease(struct metapage * mp);
 
 /*
  *                transaction block/lock management
  *                ---------------------------------
  */
 
 /*
  * Get a transaction lock from the free list.  If the number in use is
  * greater than the high water mark, wake up the sync daemon.  This should
  * free some anonymous transaction locks.  (TXN_LOCK must be held.)
  */
 static lid_t txLockAlloc(void)
 {
         lid_t lid;
 
         INCREMENT(TxStat.txLockAlloc);
         if (!TxAnchor.freelock) {
                 INCREMENT(TxStat.txLockAlloc_freelock);
         }
 
         while (!(lid = TxAnchor.freelock))
                 TXN_SLEEP(&TxAnchor.freelockwait);
         TxAnchor.freelock = TxLock[lid].next;
         HIGHWATERMARK(stattx.maxlid, lid);
         if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) {
                 jfs_info("txLockAlloc tlocks low");
                 jfs_tlocks_low = 1;
                 wake_up_process(jfsSyncThread);
         }
 
         return lid;
 }
 
 static void txLockFree(lid_t lid)
 {
         TxLock[lid].tid = 0;
         TxLock[lid].next = TxAnchor.freelock;
         TxAnchor.freelock = lid;
         TxAnchor.tlocksInUse--;
         if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) {
                 jfs_info("txLockFree jfs_tlocks_low no more");
                 jfs_tlocks_low = 0;
                 TXN_WAKEUP(&TxAnchor.lowlockwait);
         }
         TXN_WAKEUP(&TxAnchor.freelockwait);
 }
 
 /*
  * NAME:        txInit()
  *
  * FUNCTION:        initialize transaction management structures
  *
  * RETURN:
  *
  * serialization: single thread at jfs_init()
  */
 int txInit(void)
 {
         int k, size;
         struct sysinfo si;
 
         /* Set defaults for nTxLock and nTxBlock if unset */
 
         if (nTxLock == -1) {
                 if (nTxBlock == -1) {
                         /* Base default on memory size */
                         si_meminfo(&si);
                         if (si.totalram > (256 * 1024)) /* 1 GB */
                                 nTxLock = 64 * 1024;
                         else
                                 nTxLock = si.totalram >> 2;
                 } else if (nTxBlock > (8 * 1024))
                         nTxLock = 64 * 1024;
                 else
                         nTxLock = nTxBlock << 3;
         }
         if (nTxBlock == -1)
                 nTxBlock = nTxLock >> 3;
 
         /* Verify tunable parameters */
         if (nTxBlock < 16)
                 nTxBlock = 16;        /* No one should set it this low */
         if (nTxBlock > 65536)
                 nTxBlock = 65536;
         if (nTxLock < 256)
                 nTxLock = 256;        /* No one should set it this low */
         if (nTxLock > 65536)
                 nTxLock = 65536;
 
         printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n",
                nTxBlock, nTxLock);
         /*
          * initialize transaction block (tblock) table
          *
          * transaction id (tid) = tblock index
          * tid = 0 is reserved.
          */
         TxLockLWM = (nTxLock * 4) / 10;
         TxLockHWM = (nTxLock * 7) / 10;
         TxLockVHWM = (nTxLock * 8) / 10;
 
         size = sizeof(struct tblock) * nTxBlock;
         TxBlock = vmalloc(size);
         if (TxBlock == NULL)
                 return -ENOMEM;
 
         for (k = 1; k < nTxBlock - 1; k++) {
                 TxBlock[k].next = k + 1;
                 init_waitqueue_head(&TxBlock[k].gcwait);
                 init_waitqueue_head(&TxBlock[k].waitor);
         }
         TxBlock[k].next = 0;
         init_waitqueue_head(&TxBlock[k].gcwait);
         init_waitqueue_head(&TxBlock[k].waitor);
 
         TxAnchor.freetid = 1;
         init_waitqueue_head(&TxAnchor.freewait);
 
         stattx.maxtid = 1;        /* statistics */
 
         /*
          * initialize transaction lock (tlock) table
          *
          * transaction lock id = tlock index
          * tlock id = 0 is reserved.
          */
         size = sizeof(struct tlock) * nTxLock;
         TxLock = vmalloc(size);
         if (TxLock == NULL) {
                 vfree(TxBlock);
                 return -ENOMEM;
         }
 
         /* initialize tlock table */
         for (k = 1; k < nTxLock - 1; k++)
                 TxLock[k].next = k + 1;
         TxLock[k].next = 0;
         init_waitqueue_head(&TxAnchor.freelockwait);
         init_waitqueue_head(&TxAnchor.lowlockwait);
 
         TxAnchor.freelock = 1;
         TxAnchor.tlocksInUse = 0;
         INIT_LIST_HEAD(&TxAnchor.anon_list);
         INIT_LIST_HEAD(&TxAnchor.anon_list2);
 
         LAZY_LOCK_INIT();
         INIT_LIST_HEAD(&TxAnchor.unlock_queue);
 
         stattx.maxlid = 1;        /* statistics */
 
         return 0;
 }
 
 /*
  * NAME:        txExit()
  *
  * FUNCTION:        clean up when module is unloaded
  */
 void txExit(void)
 {
         vfree(TxLock);
         TxLock = NULL;
         vfree(TxBlock);
         TxBlock = NULL;
 }
 
 /*
  * NAME:        txBegin()
  *
  * FUNCTION:        start a transaction.
  *
  * PARAMETER:        sb        - superblock
  *                flag        - force for nested tx;
  *
  * RETURN:        tid        - transaction id
  *
  * note: flag force allows to start tx for nested tx
  * to prevent deadlock on logsync barrier;
  */
 tid_t txBegin(struct super_block *sb, int flag)
 {
         tid_t t;
         struct tblock *tblk;
         struct jfs_log *log;
 
         jfs_info("txBegin: flag = 0x%x", flag);
         log = JFS_SBI(sb)->log;
 
         TXN_LOCK();
 
         INCREMENT(TxStat.txBegin);
 
       retry:
         if (!(flag & COMMIT_FORCE)) {
                 /*
                  * synchronize with logsync barrier
                  */
                 if (test_bit(log_SYNCBARRIER, &log->flag) ||
                     test_bit(log_QUIESCE, &log->flag)) {
                         INCREMENT(TxStat.txBegin_barrier);
                         TXN_SLEEP(&log->syncwait);
                         goto retry;
                 }
         }
         if (flag == 0) {
                 /*
                  * Don't begin transaction if we're getting starved for tlocks
                  * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
                  * free tlocks)
                  */
                 if (TxAnchor.tlocksInUse > TxLockVHWM) {
                         INCREMENT(TxStat.txBegin_lockslow);
                         TXN_SLEEP(&TxAnchor.lowlockwait);
                         goto retry;
                 }
         }
 
         /*
          * allocate transaction id/block
          */
         if ((t = TxAnchor.freetid) == 0) {
                 jfs_info("txBegin: waiting for free tid");
                 INCREMENT(TxStat.txBegin_freetid);
                 TXN_SLEEP(&TxAnchor.freewait);
                 goto retry;
         }
 
         tblk = tid_to_tblock(t);
 
         if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) {
                 /* Don't let a non-forced transaction take the last tblk */
                 jfs_info("txBegin: waiting for free tid");
                 INCREMENT(TxStat.txBegin_freetid);
                 TXN_SLEEP(&TxAnchor.freewait);
                 goto retry;
         }
 
         TxAnchor.freetid = tblk->next;
 
         /*
          * initialize transaction
          */
 
         /*
          * We can't zero the whole thing or we screw up another thread being
          * awakened after sleeping on tblk->waitor
          *
          * memset(tblk, 0, sizeof(struct tblock));
          */
         tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0;
 
         tblk->sb = sb;
         ++log->logtid;
         tblk->logtid = log->logtid;
 
         ++log->active;
 
         HIGHWATERMARK(stattx.maxtid, t);        /* statistics */
         INCREMENT(stattx.ntid);        /* statistics */
 
         TXN_UNLOCK();
 
         jfs_info("txBegin: returning tid = %d", t);
 
         return t;
 }
 
 /*
  * NAME:        txBeginAnon()
  *
  * FUNCTION:        start an anonymous transaction.
  *                Blocks if logsync or available tlocks are low to prevent
  *                anonymous tlocks from depleting supply.
  *
  * PARAMETER:        sb        - superblock
  *
  * RETURN:        none
  */
 void txBeginAnon(struct super_block *sb)
 {
         struct jfs_log *log;
 
         log = JFS_SBI(sb)->log;
 
         TXN_LOCK();
         INCREMENT(TxStat.txBeginAnon);
 
       retry:
         /*
          * synchronize with logsync barrier
          */
         if (test_bit(log_SYNCBARRIER, &log->flag) ||
             test_bit(log_QUIESCE, &log->flag)) {
                 INCREMENT(TxStat.txBeginAnon_barrier);
                 TXN_SLEEP(&log->syncwait);
                 goto retry;
         }
 
         /*
          * Don't begin transaction if we're getting starved for tlocks
          */
         if (TxAnchor.tlocksInUse > TxLockVHWM) {
                 INCREMENT(TxStat.txBeginAnon_lockslow);
                 TXN_SLEEP(&TxAnchor.lowlockwait);
                 goto retry;
         }
         TXN_UNLOCK();
 }
 
 /*
  *        txEnd()
  *
  * function: free specified transaction block.
  *
  *        logsync barrier processing:
  *
  * serialization:
  */
 void txEnd(tid_t tid)
 {
         struct tblock *tblk = tid_to_tblock(tid);
         struct jfs_log *log;
 
         jfs_info("txEnd: tid = %d", tid);
         TXN_LOCK();
 
         /*
          * wakeup transactions waiting on the page locked
          * by the current transaction
          */
         TXN_WAKEUP(&tblk->waitor);
 
         log = JFS_SBI(tblk->sb)->log;
 
         /*
          * Lazy commit thread can't free this guy until we mark it UNLOCKED,
          * otherwise, we would be left with a transaction that may have been
          * reused.
          *
          * Lazy commit thread will turn off tblkGC_LAZY before calling this
          * routine.
          */
         if (tblk->flag & tblkGC_LAZY) {
                 jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk);
                 TXN_UNLOCK();
 
                 spin_lock_irq(&log->gclock);        // LOGGC_LOCK
                 tblk->flag |= tblkGC_UNLOCKED;
                 spin_unlock_irq(&log->gclock);        // LOGGC_UNLOCK
                 return;
         }
 
         jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk);
 
         assert(tblk->next == 0);
 
         /*
          * insert tblock back on freelist
          */
         tblk->next = TxAnchor.freetid;
         TxAnchor.freetid = tid;
 
         /*
          * mark the tblock not active
          */
         if (--log->active == 0) {
                 clear_bit(log_FLUSH, &log->flag);
 
                 /*
                  * synchronize with logsync barrier
                  */
                 if (test_bit(log_SYNCBARRIER, &log->flag)) {
                         TXN_UNLOCK();
 
                         /* write dirty metadata & forward log syncpt */
                         jfs_syncpt(log, 1);
 
                         jfs_info("log barrier off: 0x%x", log->lsn);
 
                         /* enable new transactions start */
                         clear_bit(log_SYNCBARRIER, &log->flag);
 
                         /* wakeup all waitors for logsync barrier */
                         TXN_WAKEUP(&log->syncwait);
 
                         goto wakeup;
                 }
         }
 
         TXN_UNLOCK();
 wakeup:
         /*
          * wakeup all waitors for a free tblock
          */
         TXN_WAKEUP(&TxAnchor.freewait);
 }
 
 /*
  *        txLock()
  *
  * function: acquire a transaction lock on the specified <mp>
  *
  * parameter:
  *
  * return:        transaction lock id
  *
  * serialization:
  */
 struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
                      int type)
 {
         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
         int dir_xtree = 0;
         lid_t lid;
         tid_t xtid;
         struct tlock *tlck;
         struct xtlock *xtlck;
         struct linelock *linelock;
         xtpage_t *p;
         struct tblock *tblk;
 
         TXN_LOCK();
 
         if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) &&
             !(mp->xflag & COMMIT_PAGE)) {
                 /*
                  * Directory inode is special.  It can have both an xtree tlock
                  * and a dtree tlock associated with it.
                  */
                 dir_xtree = 1;
                 lid = jfs_ip->xtlid;
         } else
                 lid = mp->lid;
 
         /* is page not locked by a transaction ? */
         if (lid == 0)
                 goto allocateLock;
 
         jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid);
 
         /* is page locked by the requester transaction ? */
         tlck = lid_to_tlock(lid);
         if ((xtid = tlck->tid) == tid) {
                 TXN_UNLOCK();
                 goto grantLock;
         }
 
         /*
          * is page locked by anonymous transaction/lock ?
          *
          * (page update without transaction (i.e., file write) is
          * locked under anonymous transaction tid = 0:
          * anonymous tlocks maintained on anonymous tlock list of
          * the inode of the page and available to all anonymous
          * transactions until txCommit() time at which point
          * they are transferred to the transaction tlock list of
          * the commiting transaction of the inode)
          */
         if (xtid == 0) {
                 tlck->tid = tid;
                 TXN_UNLOCK();
                 tblk = tid_to_tblock(tid);
                 /*
                  * The order of the tlocks in the transaction is important
                  * (during truncate, child xtree pages must be freed before
                  * parent's tlocks change the working map).
                  * Take tlock off anonymous list and add to tail of
                  * transaction list
                  *
                  * Note:  We really need to get rid of the tid & lid and
                  * use list_head's.  This code is getting UGLY!
                  */
                 if (jfs_ip->atlhead == lid) {
                         if (jfs_ip->atltail == lid) {
                                 /* only anonymous txn.
                                  * Remove from anon_list
                                  */
                                 TXN_LOCK();
                                 list_del_init(&jfs_ip->anon_inode_list);
                                 TXN_UNLOCK();
                         }
                         jfs_ip->atlhead = tlck->next;
                 } else {
                         lid_t last;
                         for (last = jfs_ip->atlhead;
                              lid_to_tlock(last)->next != lid;
                              last = lid_to_tlock(last)->next) {
                                 assert(last);
                         }
                         lid_to_tlock(last)->next = tlck->next;
                         if (jfs_ip->atltail == lid)
                                 jfs_ip->atltail = last;
                 }
 
                 /* insert the tlock at tail of transaction tlock list */
 
                 if (tblk->next)
                         lid_to_tlock(tblk->last)->next = lid;
                 else
                         tblk->next = lid;
                 tlck->next = 0;
                 tblk->last = lid;
 
                 goto grantLock;
         }
 
         goto waitLock;
 
         /*
          * allocate a tlock
          */
       allocateLock:
         lid = txLockAlloc();
         tlck = lid_to_tlock(lid);
 
         /*
          * initialize tlock
          */
         tlck->tid = tid;
 
         TXN_UNLOCK();
 
         /* mark tlock for meta-data page */
         if (mp->xflag & COMMIT_PAGE) {
 
                 tlck->flag = tlckPAGELOCK;
 
                 /* mark the page dirty and nohomeok */
                 metapage_nohomeok(mp);
 
                 jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
                          mp, mp->nohomeok, tid, tlck);
 
                 /* if anonymous transaction, and buffer is on the group
                  * commit synclist, mark inode to show this.  This will
                  * prevent the buffer from being marked nohomeok for too
                  * long a time.
                  */
                 if ((tid == 0) && mp->lsn)
                         set_cflag(COMMIT_Synclist, ip);
         }
         /* mark tlock for in-memory inode */
         else
                 tlck->flag = tlckINODELOCK;
 
         if (S_ISDIR(ip->i_mode))
                 tlck->flag |= tlckDIRECTORY;
 
         tlck->type = 0;
 
         /* bind the tlock and the page */
         tlck->ip = ip;
         tlck->mp = mp;
         if (dir_xtree)
                 jfs_ip->xtlid = lid;
         else
                 mp->lid = lid;
 
         /*
          * enqueue transaction lock to transaction/inode
          */
         /* insert the tlock at tail of transaction tlock list */
         if (tid) {
                 tblk = tid_to_tblock(tid);
                 if (tblk->next)
                         lid_to_tlock(tblk->last)->next = lid;
                 else
                         tblk->next = lid;
                 tlck->next = 0;
                 tblk->last = lid;
         }
         /* anonymous transaction:
          * insert the tlock at head of inode anonymous tlock list
          */
         else {
                 tlck->next = jfs_ip->atlhead;
                 jfs_ip->atlhead = lid;
                 if (tlck->next == 0) {
                         /* This inode's first anonymous transaction */
                         jfs_ip->atltail = lid;
                         TXN_LOCK();
                         list_add_tail(&jfs_ip->anon_inode_list,
                                       &TxAnchor.anon_list);
                         TXN_UNLOCK();
                 }
         }
 
         /* initialize type dependent area for linelock */
         linelock = (struct linelock *) & tlck->lock;
         linelock->next = 0;
         linelock->flag = tlckLINELOCK;
         linelock->maxcnt = TLOCKSHORT;
         linelock->index = 0;
 
         switch (type & tlckTYPE) {
         case tlckDTREE:
                 linelock->l2linesize = L2DTSLOTSIZE;
                 break;
 
         case tlckXTREE:
                 linelock->l2linesize = L2XTSLOTSIZE;
 
                 xtlck = (struct xtlock *) linelock;
                 xtlck->header.offset = 0;
                 xtlck->header.length = 2;
 
                 if (type & tlckNEW) {
                         xtlck->lwm.offset = XTENTRYSTART;
                 } else {
                         if (mp->xflag & COMMIT_PAGE)
                                 p = (xtpage_t *) mp->data;
                         else
                                 p = &jfs_ip->i_xtroot;
                         xtlck->lwm.offset =
                             le16_to_cpu(p->header.nextindex);
                 }
                 xtlck->lwm.length = 0;        /* ! */
                 xtlck->twm.offset = 0;
                 xtlck->hwm.offset = 0;
 
                 xtlck->index = 2;
                 break;
 
         case tlckINODE:
                 linelock->l2linesize = L2INODESLOTSIZE;
                 break;
 
         case tlckDATA:
                 linelock->l2linesize = L2DATASLOTSIZE;
                 break;
 
         default:
                 jfs_err("UFO tlock:0x%p", tlck);
         }
 
         /*
          * update tlock vector
          */
       grantLock:
         tlck->type |= type;
 
         return tlck;
 
         /*
          * page is being locked by another transaction:
          */
       waitLock:
         /* Only locks on ipimap or ipaimap should reach here */
         /* assert(jfs_ip->fileset == AGGREGATE_I); */
         if (jfs_ip->fileset != AGGREGATE_I) {
                 printk(KERN_ERR "txLock: trying to lock locked page!");
                 print_hex_dump(KERN_ERR, "ip: ", DUMP_PREFIX_ADDRESS, 16, 4,
                                ip, sizeof(*ip), 0);
                 print_hex_dump(KERN_ERR, "mp: ", DUMP_PREFIX_ADDRESS, 16, 4,
                                mp, sizeof(*mp), 0);
                 print_hex_dump(KERN_ERR, "Locker's tblock: ",
                                DUMP_PREFIX_ADDRESS, 16, 4, tid_to_tblock(tid),
                                sizeof(struct tblock), 0);
                 print_hex_dump(KERN_ERR, "Tlock: ", DUMP_PREFIX_ADDRESS, 16, 4,
                                tlck, sizeof(*tlck), 0);
                 BUG();
         }
         INCREMENT(stattx.waitlock);        /* statistics */
         TXN_UNLOCK();
         release_metapage(mp);
         TXN_LOCK();
         xtid = tlck->tid;        /* reacquire after dropping TXN_LOCK */
 
         jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
                  tid, xtid, lid);
 
         /* Recheck everything since dropping TXN_LOCK */
         if (xtid && (tlck->mp == mp) && (mp->lid == lid))
                 TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
         else
                 TXN_UNLOCK();
         jfs_info("txLock: awakened     tid = %d, lid = %d", tid, lid);
 
         return NULL;
 }
 
 /*
  * NAME:        txRelease()
  *
  * FUNCTION:        Release buffers associated with transaction locks, but don't
  *                mark homeok yet.  The allows other transactions to modify
  *                buffers, but won't let them go to disk until commit record
  *                actually gets written.
  *
  * PARAMETER:
  *                tblk        -
  *
  * RETURN:        Errors from subroutines.
  */
 static void txRelease(struct tblock * tblk)
 {
         struct metapage *mp;
         lid_t lid;
         struct tlock *tlck;
 
         TXN_LOCK();
 
         for (lid = tblk->next; lid; lid = tlck->next) {
                 tlck = lid_to_tlock(lid);
                 if ((mp = tlck->mp) != NULL &&
                     (tlck->type & tlckBTROOT) == 0) {
                         assert(mp->xflag & COMMIT_PAGE);
                         mp->lid = 0;
                 }
         }
 
         /*
          * wakeup transactions waiting on a page locked
          * by the current transaction
          */
         TXN_WAKEUP(&tblk->waitor);
 
         TXN_UNLOCK();
 }
 
 /*
  * NAME:        txUnlock()
  *
  * FUNCTION:        Initiates pageout of pages modified by tid in journalled
  *                objects and frees their lockwords.
  */
 static void txUnlock(struct tblock * tblk)
 {
         struct tlock *tlck;
         struct linelock *linelock;
         lid_t lid, next, llid, k;
         struct metapage *mp;
         struct jfs_log *log;
         int difft, diffp;
         unsigned long flags;
 
         jfs_info("txUnlock: tblk = 0x%p", tblk);
         log = JFS_SBI(tblk->sb)->log;
 
         /*
          * mark page under tlock homeok (its log has been written):
          */
         for (lid = tblk->next; lid; lid = next) {
                 tlck = lid_to_tlock(lid);
                 next = tlck->next;
 
                 jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck);
 
                 /* unbind page from tlock */
                 if ((mp = tlck->mp) != NULL &&
                     (tlck->type & tlckBTROOT) == 0) {
                         assert(mp->xflag & COMMIT_PAGE);
 
                         /* hold buffer
                          */
                         hold_metapage(mp);
 
                         assert(mp->nohomeok > 0);
                         _metapage_homeok(mp);
 
                         /* inherit younger/larger clsn */
                         LOGSYNC_LOCK(log, flags);
                         if (mp->clsn) {
                                 logdiff(difft, tblk->clsn, log);
                                 logdiff(diffp, mp->clsn, log);
                                 if (difft > diffp)
                                         mp->clsn = tblk->clsn;
                         } else
                                 mp->clsn = tblk->clsn;
                         LOGSYNC_UNLOCK(log, flags);
 
                         assert(!(tlck->flag & tlckFREEPAGE));
 
                         put_metapage(mp);
                 }
 
                 /* insert tlock, and linelock(s) of the tlock if any,
                  * at head of freelist
                  */
                 TXN_LOCK();
 
                 llid = ((struct linelock *) & tlck->lock)->next;
                 while (llid) {
                         linelock = (struct linelock *) lid_to_tlock(llid);
                         k = linelock->next;
                         txLockFree(llid);
                         llid = k;
                 }
                 txLockFree(lid);
 
                 TXN_UNLOCK();
         }
         tblk->next = tblk->last = 0;
 
         /*
          * remove tblock from logsynclist
          * (allocation map pages inherited lsn of tblk and
          * has been inserted in logsync list at txUpdateMap())
          */
         if (tblk->lsn) {
                 LOGSYNC_LOCK(log, flags);
                 log->count--;
                 list_del(&tblk->synclist);
                 LOGSYNC_UNLOCK(log, flags);
         }
 }
 
 /*
  *        txMaplock()
  *
  * function: allocate a transaction lock for freed page/entry;
  *        for freed page, maplock is used as xtlock/dtlock type;
  */
 struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
 {
         struct jfs_inode_info *jfs_ip = JFS_IP(ip);
         lid_t lid;
        struct tblock *tblk;
        struct tlock *tlck;
        struct maplock *maplock;

        TXN_LOCK();

        /*
         * allocate a tlock
         */
        lid = txLockAlloc();
        tlck = lid_to_tlock(lid);

        /*
         * initialize tlock
         */
        tlck->tid = tid;

        /* bind the tlock and the object */
        tlck->flag = tlckINODELOCK;
        if (S_ISDIR(ip->i_mode))
                tlck->flag |= tlckDIRECTORY;
        tlck->ip = ip;
        tlck->mp = NULL;

        tlck->type = type;

        /*
         * enqueue transaction lock to transaction/inode
         */
        /* insert the tlock at tail of transaction tlock list */
        if (tid) {
                tblk = tid_to_tblock(tid);
                if (tblk->next)
                        lid_to_tlock(tblk->last)->next = lid;
                else
                        tblk->next = lid;
                tlck->next = 0;
                tblk->last = lid;
        }
        /* anonymous transaction:
         * insert the tlock at head of inode anonymous tlock list
         */
        else {
                tlck->next = jfs_ip->atlhead;
                jfs_ip->atlhead = lid;
                if (tlck->next == 0) {
                        /* This inode's first anonymous transaction */
                        jfs_ip->atltail = lid;
                        list_add_tail(&jfs_ip->anon_inode_list,
                                      &TxAnchor.anon_list);
                }
        }

        TXN_UNLOCK();

        /* initialize type dependent area for maplock */
        maplock = (struct maplock *) & tlck->lock;
        maplock->next = 0;
        maplock->maxcnt = 0;
        maplock->index = 0;

        return tlck;
}

/*
 *        txLinelock()
 *
 * function: allocate a transaction lock for log vector list
 */
struct linelock *txLinelock(struct linelock * tlock)
{
        lid_t lid;
        struct tlock *tlck;
        struct linelock *linelock;

        TXN_LOCK();

        /* allocate a TxLock structure */
        lid = txLockAlloc();
        tlck = lid_to_tlock(lid);

        TXN_UNLOCK();

        /* initialize linelock */
        linelock = (struct linelock *) tlck;
        linelock->next = 0;
        linelock->flag = tlckLINELOCK;
        linelock->maxcnt = TLOCKLONG;
        linelock->index = 0;
        if (tlck->flag & tlckDIRECTORY)
                linelock->flag |= tlckDIRECTORY;

        /* append linelock after tlock */
        linelock->next = tlock->next;
        tlock->next = lid;

        return linelock;
}

/*
 *                transaction commit management
 *                -----------------------------
 */

/*
 * NAME:        txCommit()
 *
 * FUNCTION:        commit the changes to the objects specified in
 *                clist.  For journalled segments only the
 *                changes of the caller are committed, ie by tid.
 *                for non-journalled segments the data are flushed to
 *                disk and then the change to the disk inode and indirect
 *                blocks committed (so blocks newly allocated to the
 *                segment will be made a part of the segment atomically).
 *
 *                all of the segments specified in clist must be in
 *                one file system. no more than 6 segments are needed
 *                to handle all unix svcs.
 *
 *                if the i_nlink field (i.e. disk inode link count)
 *                is zero, and the type of inode is a regular file or
 *                directory, or symbolic link , the inode is truncated
 *                to zero length. the truncation is committed but the
 *                VM resources are unaffected until it is closed (see
 *                iput and iclose).
 *
 * PARAMETER:
 *
 * RETURN:
 *
 * serialization:
 *                on entry the inode lock on each segment is assumed
 *                to be held.
 *
 * i/o error:
 */
int txCommit(tid_t tid,                /* transaction identifier */
             int nip,                /* number of inodes to commit */
             struct inode **iplist,        /* list of inode to commit */
             int flag)
{
        int rc = 0;
        struct commit cd;
        struct jfs_log *log;
        struct tblock *tblk;
        struct lrd *lrd;
        int lsn;
        struct inode *ip;
        struct jfs_inode_info *jfs_ip;
        int k, n;
        ino_t top;
        struct super_block *sb;

        jfs_info("txCommit, tid = %d, flag = %d", tid, flag);
        /* is read-only file system ? */
        if (isReadOnly(iplist[0])) {
                rc = -EROFS;
                goto TheEnd;
        }

        sb = cd.sb = iplist[0]->i_sb;
        cd.tid = tid;

        if (tid == 0)
                tid = txBegin(sb, 0);
        tblk = tid_to_tblock(tid);

        /*
         * initialize commit structure
         */
        log = JFS_SBI(sb)->log;
        cd.log = log;

        /* initialize log record descriptor in commit */
        lrd = &cd.lrd;
        lrd->logtid = cpu_to_le32(tblk->logtid);
        lrd->backchain = 0;

        tblk->xflag |= flag;

        if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0)
                tblk->xflag |= COMMIT_LAZY;
        /*
         *        prepare non-journaled objects for commit
         *
         * flush data pages of non-journaled file
         * to prevent the file getting non-initialized disk blocks
         * in case of crash.
         * (new blocks - )
         */
        cd.iplist = iplist;
        cd.nip = nip;

        /*
         *        acquire transaction lock on (on-disk) inodes
         *
         * update on-disk inode from in-memory inode
         * acquiring transaction locks for AFTER records
         * on the on-disk inode of file object
         *
         * sort the inodes array by inode number in descending order
         * to prevent deadlock when acquiring transaction lock
         * of on-disk inodes on multiple on-disk inode pages by
         * multiple concurrent transactions
         */
        for (k = 0; k < cd.nip; k++) {
                top = (cd.iplist[k])->i_ino;
                for (n = k + 1; n < cd.nip; n++) {
                        ip = cd.iplist[n];
                        if (ip->i_ino > top) {
                                top = ip->i_ino;
                                cd.iplist[n] = cd.iplist[k];
                                cd.iplist[k] = ip;
                        }
                }

                ip = cd.iplist[k];
                jfs_ip = JFS_IP(ip);

                /*
                 * BUGBUG - This code has temporarily been removed.  The
                 * intent is to ensure that any file data is written before
                 * the metadata is committed to the journal.  This prevents
                 * uninitialized data from appearing in a file after the
                 * journal has been replayed.  (The uninitialized data
                 * could be sensitive data removed by another user.)
                 *
                 * The problem now is that we are holding the IWRITELOCK
                 * on the inode, and calling filemap_fdatawrite on an
                 * unmapped page will cause a deadlock in jfs_get_block.
                 *
                 * The long term solution is to pare down the use of
                 * IWRITELOCK.  We are currently holding it too long.
                 * We could also be smarter about which data pages need
                 * to be written before the transaction is committed and
                 * when we don't need to worry about it at all.
                 *
                 * if ((!S_ISDIR(ip->i_mode))
                 *    && (tblk->flag & COMMIT_DELETE) == 0)
                 *        filemap_write_and_wait(ip->i_mapping);
                 */

                /*
                 * Mark inode as not dirty.  It will still be on the dirty
                 * inode list, but we'll know not to commit it again unless
                 * it gets marked dirty again
                 */
                clear_cflag(COMMIT_Dirty, ip);

                /* inherit anonymous tlock(s) of inode */
                if (jfs_ip->atlhead) {
                        lid_to_tlock(jfs_ip->atltail)->next = tblk->next;
                        tblk->next = jfs_ip->atlhead;
                        if (!tblk->last)
                                tblk->last = jfs_ip->atltail;
                        jfs_ip->atlhead = jfs_ip->atltail = 0;
                        TXN_LOCK();
                        list_del_init(&jfs_ip->anon_inode_list);
                        TXN_UNLOCK();
                }

                /*
                 * acquire transaction lock on on-disk inode page
                 * (become first tlock of the tblk's tlock list)
                 */
                if (((rc = diWrite(tid, ip))))
                        goto out;
        }

        /*
         *        write log records from transaction locks
         *
         * txUpdateMap() resets XAD_NEW in XAD.
         */
        if ((rc = txLog(log, tblk, &cd)))
                goto TheEnd;

        /*
         * Ensure that inode isn't reused before
         * lazy commit thread finishes processing
         */
        if (tblk->xflag & COMMIT_DELETE) {
                atomic_inc(&tblk->u.ip->i_count);
                /*
                 * Avoid a rare deadlock
                 *
                 * If the inode is locked, we may be blocked in
                 * jfs_commit_inode.  If so, we don't want the
                 * lazy_commit thread doing the last iput() on the inode
                 * since that may block on the locked inode.  Instead,
                 * commit the transaction synchronously, so the last iput
                 * will be done by the calling thread (or later)
                 */
                /*
                 * I believe this code is no longer needed.  Splitting I_LOCK
                 * into two bits, I_LOCK and I_SYNC should prevent this
                 * deadlock as well.  But since I don't have a JFS testload
                 * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
                 * Joern
                 */
                if (tblk->u.ip->i_state & I_SYNC)
                        tblk->xflag &= ~COMMIT_LAZY;
        }

        ASSERT((!(tblk->xflag & COMMIT_DELETE)) ||
               ((tblk->u.ip->i_nlink == 0) &&
                !test_cflag(COMMIT_Nolink, tblk->u.ip)));

        /*
         *        write COMMIT log record
         */
        lrd->type = cpu_to_le16(LOG_COMMIT);
        lrd->length = 0;
        lsn = lmLog(log, tblk, lrd, NULL);

        lmGroupCommit(log, tblk);

        /*
         *        - transaction is now committed -
         */

        /*
         * force pages in careful update
         * (imap addressing structure update)
         */
        if (flag & COMMIT_FORCE)
                txForce(tblk);

        /*
         *        update allocation map.
         *
         * update inode allocation map and inode:
         * free pager lock on memory object of inode if any.
         * update block allocation map.
         *
         * txUpdateMap() resets XAD_NEW in XAD.
         */
        if (tblk->xflag & COMMIT_FORCE)
                txUpdateMap(tblk);

        /*
         *        free transaction locks and pageout/free pages
         */
        txRelease(tblk);

        if ((tblk->flag & tblkGC_LAZY) == 0)
                txUnlock(tblk);


        /*
         *        reset in-memory object state
         */
        for (k = 0; k < cd.nip; k++) {
                ip = cd.iplist[k];
                jfs_ip = JFS_IP(ip);

                /*
                 * reset in-memory inode state
                 */
                jfs_ip->bxflag = 0;
                jfs_ip->blid = 0;
        }

      out:
        if (rc != 0)
                txAbort(tid, 1);

      TheEnd:
        jfs_info("txCommit: tid = %d, returning %d", tid, rc);
        return rc;
}

/*
 * NAME:        txLog()
 *
 * FUNCTION:        Writes AFTER log records for all lines modified
 *                by tid for segments specified by inodes in comdata.
 *                Code assumes only WRITELOCKS are recorded in lockwords.
 *
 * PARAMETERS:
 *
 * RETURN :
 */
static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
{
        int rc = 0;
        struct inode *ip;
        lid_t lid;
        struct tlock *tlck;
        struct lrd *lrd = &cd->lrd;

        /*
         * write log record(s) for each tlock of transaction,
         */
        for (lid = tblk->next; lid; lid = tlck->next) {
                tlck = lid_to_tlock(lid);

                tlck->flag |= tlckLOG;

                /* initialize lrd common */
                ip = tlck->ip;
                lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate);
                lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset);
                lrd->log.redopage.inode = cpu_to_le32(ip->i_ino);

                /* write log record of page from the tlock */
                switch (tlck->type & tlckTYPE) {
                case tlckXTREE:
                        xtLog(log, tblk, lrd, tlck);
                        break;

                case tlckDTREE:
                        dtLog(log, tblk, lrd, tlck);
                        break;

                case tlckINODE:
                        diLog(log, tblk, lrd, tlck, cd);
                        break;

                case tlckMAP:
                        mapLog(log, tblk, lrd, tlck);
                        break;

                case tlckDATA:
                        dataLog(log, tblk, lrd, tlck);
                        break;

                default:
                        jfs_err("UFO tlock:0x%p", tlck);
                }
        }

        return rc;
}

/*
 *        diLog()
 *
 * function:        log inode tlock and format maplock to update bmap;
 */
static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                 struct tlock * tlck, struct commit * cd)
{
        int rc = 0;
        struct metapage *mp;
        pxd_t *pxd;
        struct pxd_lock *pxdlock;

        mp = tlck->mp;

        /* initialize as REDOPAGE record format */
        lrd->log.redopage.type = cpu_to_le16(LOG_INODE);
        lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE);

        pxd = &lrd->log.redopage.pxd;

        /*
         *        inode after image
         */
        if (tlck->type & tlckENTRY) {
                /* log after-image for logredo(): */
                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                PXDaddress(pxd, mp->index);
                PXDlength(pxd,
                          mp->logical_size >> tblk->sb->s_blocksize_bits);
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;
        } else if (tlck->type & tlckFREE) {
                /*
                 *        free inode extent
                 *
                 * (pages of the freed inode extent have been invalidated and
                 * a maplock for free of the extent has been formatted at
                 * txLock() time);
                 *
                 * the tlock had been acquired on the inode allocation map page
                 * (iag) that specifies the freed extent, even though the map
                 * page is not itself logged, to prevent pageout of the map
                 * page before the log;
                 */

                /* log LOG_NOREDOINOEXT of the freed inode extent for
                 * logredo() to start NoRedoPage filters, and to update
                 * imap and bmap for free of the extent;
                 */
                lrd->type = cpu_to_le16(LOG_NOREDOINOEXT);
                /*
                 * For the LOG_NOREDOINOEXT record, we need
                 * to pass the IAG number and inode extent
                 * index (within that IAG) from which the
                 * the extent being released.  These have been
                 * passed to us in the iplist[1] and iplist[2].
                 */
                lrd->log.noredoinoext.iagnum =
                    cpu_to_le32((u32) (size_t) cd->iplist[1]);
                lrd->log.noredoinoext.inoext_idx =
                    cpu_to_le32((u32) (size_t) cd->iplist[2]);

                pxdlock = (struct pxd_lock *) & tlck->lock;
                *pxd = pxdlock->pxd;
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));

                /* update bmap */
                tlck->flag |= tlckUPDATEMAP;

                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;
        } else
                jfs_err("diLog: UFO type tlck:0x%p", tlck);
#ifdef  _JFS_WIP
        /*
         *        alloc/free external EA extent
         *
         * a maplock for txUpdateMap() to update bPWMAP for alloc/free
         * of the extent has been formatted at txLock() time;
         */
        else {
                assert(tlck->type & tlckEA);

                /* log LOG_UPDATEMAP for logredo() to update bmap for
                 * alloc of new (and free of old) external EA extent;
                 */
                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                pxdlock = (struct pxd_lock *) & tlck->lock;
                nlock = pxdlock->index;
                for (i = 0; i < nlock; i++, pxdlock++) {
                        if (pxdlock->flag & mlckALLOCPXD)
                                lrd->log.updatemap.type =
                                    cpu_to_le16(LOG_ALLOCPXD);
                        else
                                lrd->log.updatemap.type =
                                    cpu_to_le16(LOG_FREEPXD);
                        lrd->log.updatemap.nxd = cpu_to_le16(1);
                        lrd->log.updatemap.pxd = pxdlock->pxd;
                        lrd->backchain =
                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
                }

                /* update bmap */
                tlck->flag |= tlckUPDATEMAP;
        }
#endif                                /* _JFS_WIP */

        return rc;
}

/*
 *        dataLog()
 *
 * function:        log data tlock
 */
static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
            struct tlock * tlck)
{
        struct metapage *mp;
        pxd_t *pxd;

        mp = tlck->mp;

        /* initialize as REDOPAGE record format */
        lrd->log.redopage.type = cpu_to_le16(LOG_DATA);
        lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE);

        pxd = &lrd->log.redopage.pxd;

        /* log after-image for logredo(): */
        lrd->type = cpu_to_le16(LOG_REDOPAGE);

        if (jfs_dirtable_inline(tlck->ip)) {
                /*
                 * The table has been truncated, we've must have deleted
                 * the last entry, so don't bother logging this
                 */
                mp->lid = 0;
                grab_metapage(mp);
                metapage_homeok(mp);
                discard_metapage(mp);
                tlck->mp = NULL;
                return 0;
        }

        PXDaddress(pxd, mp->index);
        PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits);

        lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

        /* mark page as homeward bound */
        tlck->flag |= tlckWRITEPAGE;

        return 0;
}

/*
 *        dtLog()
 *
 * function:        log dtree tlock and format maplock to update bmap;
 */
static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
           struct tlock * tlck)
{
        struct metapage *mp;
        struct pxd_lock *pxdlock;
        pxd_t *pxd;

        mp = tlck->mp;

        /* initialize as REDOPAGE/NOREDOPAGE record format */
        lrd->log.redopage.type = cpu_to_le16(LOG_DTREE);
        lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE);

        pxd = &lrd->log.redopage.pxd;

        if (tlck->type & tlckBTROOT)
                lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);

        /*
         *        page extension via relocation: entry insertion;
         *        page extension in-place: entry insertion;
         *        new right page from page split, reinitialized in-line
         *        root from root page split: entry insertion;
         */
        if (tlck->type & (tlckNEW | tlckEXTEND)) {
                /* log after-image of the new page for logredo():
                 * mark log (LOG_NEW) for logredo() to initialize
                 * freelist and update bmap for alloc of the new page;
                 */
                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                if (tlck->type & tlckEXTEND)
                        lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND);
                else
                        lrd->log.redopage.type |= cpu_to_le16(LOG_NEW);
                PXDaddress(pxd, mp->index);
                PXDlength(pxd,
                          mp->logical_size >> tblk->sb->s_blocksize_bits);
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /* format a maplock for txUpdateMap() to update bPMAP for
                 * alloc of the new page;
                 */
                if (tlck->type & tlckBTROOT)
                        return;
                tlck->flag |= tlckUPDATEMAP;
                pxdlock = (struct pxd_lock *) & tlck->lock;
                pxdlock->flag = mlckALLOCPXD;
                pxdlock->pxd = *pxd;

                pxdlock->index = 1;

                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;
                return;
        }

        /*
         *        entry insertion/deletion,
         *        sibling page link update (old right page before split);
         */
        if (tlck->type & (tlckENTRY | tlckRELINK)) {
                /* log after-image for logredo(): */
                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                PXDaddress(pxd, mp->index);
                PXDlength(pxd,
                          mp->logical_size >> tblk->sb->s_blocksize_bits);
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;
                return;
        }

        /*
         *        page deletion: page has been invalidated
         *        page relocation: source extent
         *
         *        a maplock for free of the page has been formatted
         *        at txLock() time);
         */
        if (tlck->type & (tlckFREE | tlckRELOCATE)) {
                /* log LOG_NOREDOPAGE of the deleted page for logredo()
                 * to start NoRedoPage filter and to update bmap for free
                 * of the deletd page
                 */
                lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
                pxdlock = (struct pxd_lock *) & tlck->lock;
                *pxd = pxdlock->pxd;
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));

                /* a maplock for txUpdateMap() for free of the page
                 * has been formatted at txLock() time;
                 */
                tlck->flag |= tlckUPDATEMAP;
        }
        return;
}

/*
 *        xtLog()
 *
 * function:        log xtree tlock and format maplock to update bmap;
 */
static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
           struct tlock * tlck)
{
        struct inode *ip;
        struct metapage *mp;
        xtpage_t *p;
        struct xtlock *xtlck;
        struct maplock *maplock;
        struct xdlistlock *xadlock;
        struct pxd_lock *pxdlock;
        pxd_t *page_pxd;
        int next, lwm, hwm;

        ip = tlck->ip;
        mp = tlck->mp;

        /* initialize as REDOPAGE/NOREDOPAGE record format */
        lrd->log.redopage.type = cpu_to_le16(LOG_XTREE);
        lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE);

        page_pxd = &lrd->log.redopage.pxd;

        if (tlck->type & tlckBTROOT) {
                lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
                p = &JFS_IP(ip)->i_xtroot;
                if (S_ISDIR(ip->i_mode))
                        lrd->log.redopage.type |=
                            cpu_to_le16(LOG_DIR_XTREE);
        } else
                p = (xtpage_t *) mp->data;
        next = le16_to_cpu(p->header.nextindex);

        xtlck = (struct xtlock *) & tlck->lock;

        maplock = (struct maplock *) & tlck->lock;
        xadlock = (struct xdlistlock *) maplock;

        /*
         *        entry insertion/extension;
         *        sibling page link update (old right page before split);
         */
        if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) {
                /* log after-image for logredo():
                 * logredo() will update bmap for alloc of new/extended
                 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
                 * after-image of XADlist;
                 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
                 * applying the after-image to the meta-data page.
                 */
                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                PXDaddress(page_pxd, mp->index);
                PXDlength(page_pxd,
                          mp->logical_size >> tblk->sb->s_blocksize_bits);
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /* format a maplock for txUpdateMap() to update bPMAP
                 * for alloc of new/extended extents of XAD[lwm:next)
                 * from the page itself;
                 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
                 */
                lwm = xtlck->lwm.offset;
                if (lwm == 0)
                        lwm = XTPAGEMAXSLOT;

                if (lwm == next)
                        goto out;
                if (lwm > next) {
                        jfs_err("xtLog: lwm > next\n");
                        goto out;
                }
                tlck->flag |= tlckUPDATEMAP;
                xadlock->flag = mlckALLOCXADLIST;
                xadlock->count = next - lwm;
                if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
                        int i;
                        pxd_t *pxd;
                        /*
                         * Lazy commit may allow xtree to be modified before
                         * txUpdateMap runs.  Copy xad into linelock to
                         * preserve correct data.
                         *
                         * We can fit twice as may pxd's as xads in the lock
                         */
                        xadlock->flag = mlckALLOCPXDLIST;
                        pxd = xadlock->xdlist = &xtlck->pxdlock;
                        for (i = 0; i < xadlock->count; i++) {
                                PXDaddress(pxd, addressXAD(&p->xad[lwm + i]));
                                PXDlength(pxd, lengthXAD(&p->xad[lwm + i]));
                                p->xad[lwm + i].flag &=
                                    ~(XAD_NEW | XAD_EXTENDED);
                                pxd++;
                        }
                } else {
                        /*
                         * xdlist will point to into inode's xtree, ensure
                         * that transaction is not committed lazily.
                         */
                        xadlock->flag = mlckALLOCXADLIST;
                        xadlock->xdlist = &p->xad[lwm];
                        tblk->xflag &= ~COMMIT_LAZY;
                }
                jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d "
                         "count:%d", tlck->ip, mp, tlck, lwm, xadlock->count);

                maplock->index = 1;

              out:
                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;

                return;
        }

        /*
         *        page deletion: file deletion/truncation (ref. xtTruncate())
         *
         * (page will be invalidated after log is written and bmap
         * is updated from the page);
         */
        if (tlck->type & tlckFREE) {
                /* LOG_NOREDOPAGE log for NoRedoPage filter:
                 * if page free from file delete, NoRedoFile filter from
                 * inode image of zero link count will subsume NoRedoPage
                 * filters for each page;
                 * if page free from file truncattion, write NoRedoPage
                 * filter;
                 *
                 * upadte of block allocation map for the page itself:
                 * if page free from deletion and truncation, LOG_UPDATEMAP
                 * log for the page itself is generated from processing
                 * its parent page xad entries;
                 */
                /* if page free from file truncation, log LOG_NOREDOPAGE
                 * of the deleted page for logredo() to start NoRedoPage
                 * filter for the page;
                 */
                if (tblk->xflag & COMMIT_TRUNCATE) {
                        /* write NOREDOPAGE for the page */
                        lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
                        PXDaddress(page_pxd, mp->index);
                        PXDlength(page_pxd,
                                  mp->logical_size >> tblk->sb->
                                  s_blocksize_bits);
                        lrd->backchain =
                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));

                        if (tlck->type & tlckBTROOT) {
                                /* Empty xtree must be logged */
                                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                                lrd->backchain =
                                    cpu_to_le32(lmLog(log, tblk, lrd, tlck));
                        }
                }

                /* init LOG_UPDATEMAP of the freed extents
                 * XAD[XTENTRYSTART:hwm) from the deleted page itself
                 * for logredo() to update bmap;
                 */
                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                lrd->log.updatemap.type = cpu_to_le16(LOG_FREEXADLIST);
                xtlck = (struct xtlock *) & tlck->lock;
                hwm = xtlck->hwm.offset;
                lrd->log.updatemap.nxd =
                    cpu_to_le16(hwm - XTENTRYSTART + 1);
                /* reformat linelock for lmLog() */
                xtlck->header.offset = XTENTRYSTART;
                xtlck->header.length = hwm - XTENTRYSTART + 1;
                xtlck->index = 1;
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /* format a maplock for txUpdateMap() to update bmap
                 * to free extents of XAD[XTENTRYSTART:hwm) from the
                 * deleted page itself;
                 */
                tlck->flag |= tlckUPDATEMAP;
                xadlock->count = hwm - XTENTRYSTART + 1;
                if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
                        int i;
                        pxd_t *pxd;
                        /*
                         * Lazy commit may allow xtree to be modified before
                         * txUpdateMap runs.  Copy xad into linelock to
                         * preserve correct data.
                         *
                         * We can fit twice as may pxd's as xads in the lock
                         */
                        xadlock->flag = mlckFREEPXDLIST;
                        pxd = xadlock->xdlist = &xtlck->pxdlock;
                        for (i = 0; i < xadlock->count; i++) {
                                PXDaddress(pxd,
                                        addressXAD(&p->xad[XTENTRYSTART + i]));
                                PXDlength(pxd,
                                        lengthXAD(&p->xad[XTENTRYSTART + i]));
                                pxd++;
                        }
                } else {
                        /*
                         * xdlist will point to into inode's xtree, ensure
                         * that transaction is not committed lazily.
                         */
                        xadlock->flag = mlckFREEXADLIST;
                        xadlock->xdlist = &p->xad[XTENTRYSTART];
                        tblk->xflag &= ~COMMIT_LAZY;
                }
                jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2",
                         tlck->ip, mp, xadlock->count);

                maplock->index = 1;

                /* mark page as invalid */
                if (((tblk->xflag & COMMIT_PWMAP) || S_ISDIR(ip->i_mode))
                    && !(tlck->type & tlckBTROOT))
                        tlck->flag |= tlckFREEPAGE;
                /*
                   else (tblk->xflag & COMMIT_PMAP)
                   ? release the page;
                 */
                return;
        }

        /*
         *        page/entry truncation: file truncation (ref. xtTruncate())
         *
         *        |----------+------+------+---------------|
         *                   |      |      |
         *                   |      |     hwm - hwm before truncation
         *                   |     next - truncation point
         *                  lwm - lwm before truncation
         * header ?
         */
        if (tlck->type & tlckTRUNCATE) {
                /* This odd declaration suppresses a bogus gcc warning */
                pxd_t pxd = pxd;        /* truncated extent of xad */
                int twm;

                /*
                 * For truncation the entire linelock may be used, so it would
                 * be difficult to store xad list in linelock itself.
                 * Therefore, we'll just force transaction to be committed
                 * synchronously, so that xtree pages won't be changed before
                 * txUpdateMap runs.
                 */
                tblk->xflag &= ~COMMIT_LAZY;
                lwm = xtlck->lwm.offset;
                if (lwm == 0)
                        lwm = XTPAGEMAXSLOT;
                hwm = xtlck->hwm.offset;
                twm = xtlck->twm.offset;

                /*
                 *        write log records
                 */
                /* log after-image for logredo():
                 *
                 * logredo() will update bmap for alloc of new/extended
                 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
                 * after-image of XADlist;
                 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
                 * applying the after-image to the meta-data page.
                 */
                lrd->type = cpu_to_le16(LOG_REDOPAGE);
                PXDaddress(page_pxd, mp->index);
                PXDlength(page_pxd,
                          mp->logical_size >> tblk->sb->s_blocksize_bits);
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));

                /*
                 * truncate entry XAD[twm == next - 1]:
                 */
                if (twm == next - 1) {
                        /* init LOG_UPDATEMAP for logredo() to update bmap for
                         * free of truncated delta extent of the truncated
                         * entry XAD[next - 1]:
                         * (xtlck->pxdlock = truncated delta extent);
                         */
                        pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
                        /* assert(pxdlock->type & tlckTRUNCATE); */
                        lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                        lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
                        lrd->log.updatemap.nxd = cpu_to_le16(1);
                        lrd->log.updatemap.pxd = pxdlock->pxd;
                        pxd = pxdlock->pxd;        /* save to format maplock */
                        lrd->backchain =
                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
                }

                /*
                 * free entries XAD[next:hwm]:
                 */
                if (hwm >= next) {
                        /* init LOG_UPDATEMAP of the freed extents
                         * XAD[next:hwm] from the deleted page itself
                         * for logredo() to update bmap;
                         */
                        lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                        lrd->log.updatemap.type =
                            cpu_to_le16(LOG_FREEXADLIST);
                        xtlck = (struct xtlock *) & tlck->lock;
                        hwm = xtlck->hwm.offset;
                        lrd->log.updatemap.nxd =
                            cpu_to_le16(hwm - next + 1);
                        /* reformat linelock for lmLog() */
                        xtlck->header.offset = next;
                        xtlck->header.length = hwm - next + 1;
                        xtlck->index = 1;
                        lrd->backchain =
                            cpu_to_le32(lmLog(log, tblk, lrd, tlck));
                }

                /*
                 *        format maplock(s) for txUpdateMap() to update bmap
                 */
                maplock->index = 0;

                /*
                 * allocate entries XAD[lwm:next):
                 */
                if (lwm < next) {
                        /* format a maplock for txUpdateMap() to update bPMAP
                         * for alloc of new/extended extents of XAD[lwm:next)
                         * from the page itself;
                         * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
                         */
                        tlck->flag |= tlckUPDATEMAP;
                        xadlock->flag = mlckALLOCXADLIST;
                        xadlock->count = next - lwm;
                        xadlock->xdlist = &p->xad[lwm];

                        jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d "
                                 "lwm:%d next:%d",
                                 tlck->ip, mp, xadlock->count, lwm, next);
                        maplock->index++;
                        xadlock++;
                }

                /*
                 * truncate entry XAD[twm == next - 1]:
                 */
                if (twm == next - 1) {
                        /* format a maplock for txUpdateMap() to update bmap
                         * to free truncated delta extent of the truncated
                         * entry XAD[next - 1];
                         * (xtlck->pxdlock = truncated delta extent);
                         */
                        tlck->flag |= tlckUPDATEMAP;
                        pxdlock = (struct pxd_lock *) xadlock;
                        pxdlock->flag = mlckFREEPXD;
                        pxdlock->count = 1;
                        pxdlock->pxd = pxd;

                        jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d "
                                 "hwm:%d", ip, mp, pxdlock->count, hwm);
                        maplock->index++;
                        xadlock++;
                }

                /*
                 * free entries XAD[next:hwm]:
                 */
                if (hwm >= next) {
                        /* format a maplock for txUpdateMap() to update bmap
                         * to free extents of XAD[next:hwm] from thedeleted
                         * page itself;
                         */
                        tlck->flag |= tlckUPDATEMAP;
                        xadlock->flag = mlckFREEXADLIST;
                        xadlock->count = hwm - next + 1;
                        xadlock->xdlist = &p->xad[next];

                        jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d "
                                 "next:%d hwm:%d",
                                 tlck->ip, mp, xadlock->count, next, hwm);
                        maplock->index++;
                }

                /* mark page as homeward bound */
                tlck->flag |= tlckWRITEPAGE;
        }
        return;
}

/*
 *        mapLog()
 *
 * function:        log from maplock of freed data extents;
 */
static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
                   struct tlock * tlck)
{
        struct pxd_lock *pxdlock;
        int i, nlock;
        pxd_t *pxd;

        /*
         *        page relocation: free the source page extent
         *
         * a maplock for txUpdateMap() for free of the page
         * has been formatted at txLock() time saving the src
         * relocated page address;
         */
        if (tlck->type & tlckRELOCATE) {
                /* log LOG_NOREDOPAGE of the old relocated page
                 * for logredo() to start NoRedoPage filter;
                 */
                lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
                pxdlock = (struct pxd_lock *) & tlck->lock;
                pxd = &lrd->log.redopage.pxd;
                *pxd = pxdlock->pxd;
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));

                /* (N.B. currently, logredo() does NOT update bmap
                 * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
                 * if page free from relocation, LOG_UPDATEMAP log is
                 * specifically generated now for logredo()
                 * to update bmap for free of src relocated page;
                 * (new flag LOG_RELOCATE may be introduced which will
                 * inform logredo() to start NORedoPage filter and also
                 * update block allocation map at the same time, thus
                 * avoiding an extra log write);
                 */
                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
                lrd->log.updatemap.nxd = cpu_to_le16(1);
                lrd->log.updatemap.pxd = pxdlock->pxd;
                lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));

                /* a maplock for txUpdateMap() for free of the page
                 * has been formatted at txLock() time;
                 */
                tlck->flag |= tlckUPDATEMAP;
                return;
        }
        /*

         * Otherwise it's not a relocate request
         *
         */
        else {
                /* log LOG_UPDATEMAP for logredo() to update bmap for
                 * free of truncated/relocated delta extent of the data;
                 * e.g.: external EA extent, relocated/truncated extent
                 * from xtTailgate();
                 */
                lrd->type = cpu_to_le16(LOG_UPDATEMAP);
                pxdlock = (struct pxd_lock *) & tlck->lock;
                nlock = pxdlock->index;
                for (i = 0; i < nlock; i++, pxdlock++) {
                        if (pxdlock->flag & mlckALLOCPXD)
                                lrd->log.updatemap.type =
                                    cpu_to_le16(LOG_ALLOCPXD);
                        else
                                lrd->log.updatemap.type =
                                    cpu_to_le16(LOG_FREEPXD);
                        lrd->log.updatemap.nxd = cpu_to_le16(1);
                        lrd->log.updatemap.pxd = pxdlock->pxd;
                        lrd->backchain =
                            cpu_to_le32(lmLog(log, tblk, lrd, NULL));
                        jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
                                 (ulong) addressPXD(&pxdlock->pxd),
                                 lengthPXD(&pxdlock->pxd));
                }

                /* update bmap */
                tlck->flag |= tlckUPDATEMAP;
        }
}

/*
 *        txEA()
 *
 * function:        acquire maplock for EA/ACL extents or
 *                set COMMIT_INLINE flag;
 */
void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea)
{
        struct tlock *tlck = NULL;
        struct pxd_lock *maplock = NULL, *pxdlock = NULL;

        /*
         * format maplock for alloc of new EA extent
         */
        if (newea) {
                /* Since the newea could be a completely zeroed entry we need to
                 * check for the two flags which indicate we should actually
                 * commit new EA data
                 */
                if (newea->flag & DXD_EXTENT) {
                        tlck = txMaplock(tid, ip, tlckMAP);
                        maplock = (struct pxd_lock *) & tlck->lock;
                        pxdlock = (struct pxd_lock *) maplock;
                        pxdlock->flag = mlckALLOCPXD;
                        PXDaddress(&pxdlock->pxd, addressDXD(newea));
                        PXDlength(&pxdlock->pxd, lengthDXD(newea));
                        pxdlock++;
                        maplock->index = 1;
                } else if (newea->flag & DXD_INLINE) {
                        tlck = NULL;

                        set_cflag(COMMIT_Inlineea, ip);
                }
        }

        /*
         * format maplock for free of old EA extent
         */
        if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) {
                if (tlck == NULL) {
                        tlck = txMaplock(tid, ip, tlckMAP);
                        maplock = (struct pxd_lock *) & tlck->lock;
                        pxdlock = (struct pxd_lock *) maplock;
                        maplock->index = 0;
                }
                pxdlock->flag = mlckFREEPXD;
                PXDaddress(&pxdlock->pxd, addressDXD(oldea));
                PXDlength(&pxdlock->pxd, lengthDXD(oldea));
                maplock->index++;
        }
}

/*
 *        txForce()
 *
 * function: synchronously write pages locked by transaction
 *             after txLog() but before txUpdateMap();
 */
static void txForce(struct tblock * tblk)
{
        struct tlock *tlck;
        lid_t lid, next;
        struct metapage *mp;

        /*
         * reverse the order of transaction tlocks in
         * careful update order of address index pages
         * (right to left, bottom up)
         */
        tlck = lid_to_tlock(tblk->next);
        lid = tlck->next;
        tlck->next = 0;
        while (lid) {
                tlck = lid_to_tlock(lid);
                next = tlck->next;
                tlck->next = tblk->next;
                tblk->next = lid;
                lid = next;
        }

        /*
         * synchronously write the page, and
         * hold the page for txUpdateMap();
         */
        for (lid = tblk->next; lid; lid = next) {
                tlck = lid_to_tlock(lid);
                next = tlck->next;

                if ((mp = tlck->mp) != NULL &&
                    (tlck->type & tlckBTROOT) == 0) {
                        assert(mp->xflag & COMMIT_PAGE);

                        if (tlck->flag & tlckWRITEPAGE) {
                                tlck->flag &= ~tlckWRITEPAGE;

                                /* do not release page to freelist */
                                force_metapage(mp);
#if 0
                                /*
                                 * The "right" thing to do here is to
                                 * synchronously write the metadata.
                                 * With the current implementation this
                                 * is hard since write_metapage requires
                                 * us to kunmap & remap the page.  If we
                                 * have tlocks pointing into the metadata
                                 * pages, we don't want to do this.  I think
                                 * we can get by with synchronously writing
                                 * the pages when they are released.
                                 */
                                assert(mp->nohomeok);
                                set_bit(META_dirty, &mp->flag);
                                set_bit(META_sync, &mp->flag);
#endif
                        }
                }
        }
}

/*
 *        txUpdateMap()
 *
 * function:        update persistent allocation map (and working map
 *                if appropriate);
 *
 * parameter:
 */
static void txUpdateMap(struct tblock * tblk)
{
        struct inode *ip;
        struct inode *ipimap;
        lid_t lid;
        struct tlock *tlck;
        struct maplock *maplock;
        struct pxd_lock pxdlock;
        int maptype;
        int k, nlock;
        struct metapage *mp = NULL;

        ipimap = JFS_SBI(tblk->sb)->ipimap;

        maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP;


        /*
         *        update block allocation map
         *
         * update allocation state in pmap (and wmap) and
         * update lsn of the pmap page;
         */
        /*
         * scan each tlock/page of transaction for block allocation/free:
         *
         * for each tlock/page of transaction, update map.
         *  ? are there tlock for pmap and pwmap at the same time ?
         */
        for (lid = tblk->next; lid; lid = tlck->next) {
                tlck = lid_to_tlock(lid);

                if ((tlck->flag & tlckUPDATEMAP) == 0)
                        continue;

                if (tlck->flag & tlckFREEPAGE) {
                        /*
                         * Another thread may attempt to reuse freed space
                         * immediately, so we want to get rid of the metapage
                         * before anyone else has a chance to get it.
                         * Lock metapage, update maps, then invalidate
                         * the metapage.
                         */
                        mp = tlck->mp;
                        ASSERT(mp->xflag & COMMIT_PAGE);
                        grab_metapage(mp);
                }

                /*
                 * extent list:
                 * . in-line PXD list:
                 * . out-of-line XAD list:
                 */
                maplock = (struct maplock *) & tlck->lock;
                nlock = maplock->index;

                for (k = 0; k < nlock; k++, maplock++) {
                        /*
                         * allocate blocks in persistent map:
                         *
                         * blocks have been allocated from wmap at alloc time;
                         */
                        if (maplock->flag & mlckALLOC) {
                                txAllocPMap(ipimap, maplock, tblk);
                        }
                        /*
                         * free blocks in persistent and working map:
                         * blocks will be freed in pmap and then in wmap;
                         *
                         * ? tblock specifies the PMAP/PWMAP based upon
                         * transaction
                         *
                         * free blocks in persistent map:
                         * blocks will be freed from wmap at last reference
                         * release of the object for regular files;
                         *
                         * Alway free blocks from both persistent & working
                         * maps for directories
                         */
                        else {        /* (maplock->flag & mlckFREE) */

                                if (tlck->flag & tlckDIRECTORY)
                                        txFreeMap(ipimap, maplock,
                                                  tblk, COMMIT_PWMAP);
                                else
                                        txFreeMap(ipimap, maplock,
                                                  tblk, maptype);
                        }
                }
                if (tlck->flag & tlckFREEPAGE) {
                        if (!(tblk->flag & tblkGC_LAZY)) {
                                /* This is equivalent to txRelease */
                                ASSERT(mp->lid == lid);
                                tlck->mp->lid = 0;
                        }
                        assert(mp->nohomeok == 1);
                        metapage_homeok(mp);
                        discard_metapage(mp);
                        tlck->mp = NULL;
                }
        }
        /*
         *        update inode allocation map
         *
         * update allocation state in pmap and
         * update lsn of the pmap page;
         * update in-memory inode flag/state
         *
         * unlock mapper/write lock
         */
        if (tblk->xflag & COMMIT_CREATE) {
                diUpdatePMap(ipimap, tblk->ino, false, tblk);
                /* update persistent block allocation map
                 * for the allocation of inode extent;
                 */
                pxdlock.flag = mlckALLOCPXD;
                pxdlock.pxd = tblk->u.ixpxd;
                pxdlock.index = 1;
                txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk);
        } else if (tblk->xflag & COMMIT_DELETE) {
                ip = tblk->u.ip;
                diUpdatePMap(ipimap, ip->i_ino, true, tblk);
                iput(ip);
        }
}

/*
 *        txAllocPMap()
 *
 * function: allocate from persistent map;
 *
 * parameter:
 *        ipbmap        -
 *        malock        -
 *                xad list:
 *                pxd:
 *
 *        maptype -
 *                allocate from persistent map;
 *                free from persistent map;
 *                (e.g., tmp file - free from working map at releae
 *                 of last reference);
 *                free from persistent and working map;
 *
 *        lsn        - log sequence number;
 */
static void txAllocPMap(struct inode *ip, struct maplock * maplock,
                        struct tblock * tblk)
{
        struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
        struct xdlistlock *xadlistlock;
        xad_t *xad;
        s64 xaddr;
        int xlen;
        struct pxd_lock *pxdlock;
        struct xdlistlock *pxdlistlock;
        pxd_t *pxd;
        int n;

        /*
         * allocate from persistent map;
         */
        if (maplock->flag & mlckALLOCXADLIST) {
                xadlistlock = (struct xdlistlock *) maplock;
                xad = xadlistlock->xdlist;
                for (n = 0; n < xadlistlock->count; n++, xad++) {
                        if (xad->flag & (XAD_NEW | XAD_EXTENDED)) {
                                xaddr = addressXAD(xad);
                                xlen = lengthXAD(xad);
                                dbUpdatePMap(ipbmap, false, xaddr,
                                             (s64) xlen, tblk);
                                xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
                                jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
                                         (ulong) xaddr, xlen);
                        }
                }
        } else if (maplock->flag & mlckALLOCPXD) {
                pxdlock = (struct pxd_lock *) maplock;
                xaddr = addressPXD(&pxdlock->pxd);
                xlen = lengthPXD(&pxdlock->pxd);
                dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk);
                jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen);
        } else {                /* (maplock->flag & mlckALLOCPXDLIST) */

                pxdlistlock = (struct xdlistlock *) maplock;
                pxd = pxdlistlock->xdlist;
                for (n = 0; n < pxdlistlock->count; n++, pxd++) {
                        xaddr = addressPXD(pxd);
                        xlen = lengthPXD(pxd);
                        dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen,
                                     tblk);
                        jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
                                 (ulong) xaddr, xlen);
                }
        }
}

/*
 *        txFreeMap()
 *
 * function:        free from persistent and/or working map;
 *
 * todo: optimization
 */
void txFreeMap(struct inode *ip,
               struct maplock * maplock, struct tblock * tblk, int maptype)
{
        struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
        struct xdlistlock *xadlistlock;
        xad_t *xad;
        s64 xaddr;
        int xlen;
        struct pxd_lock *pxdlock;
        struct xdlistlock *pxdlistlock;
        pxd_t *pxd;
        int n;

        jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
                 tblk, maplock, maptype);

        /*
         * free from persistent map;
         */
        if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) {
                if (maplock->flag & mlckFREEXADLIST) {
                        xadlistlock = (struct xdlistlock *) maplock;
                        xad = xadlistlock->xdlist;
                        for (n = 0; n < xadlistlock->count; n++, xad++) {
                                if (!(xad->flag & XAD_NEW)) {
                                        xaddr = addressXAD(xad);
                                        xlen = lengthXAD(xad);
                                        dbUpdatePMap(ipbmap, true, xaddr,
                                                     (s64) xlen, tblk);
                                        jfs_info("freePMap: xaddr:0x%lx "
                                                 "xlen:%d",
                                                 (ulong) xaddr, xlen);
                                }
                        }
                } else if (maplock->flag & mlckFREEPXD) {
                        pxdlock = (struct pxd_lock *) maplock;
                        xaddr = addressPXD(&pxdlock->pxd);
                        xlen = lengthPXD(&pxdlock->pxd);
                        dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen,
                                     tblk);
                        jfs_info("freePMap: xaddr:0x%lx xlen:%d",
                                 (ulong) xaddr, xlen);
                } else {        /* (maplock->flag & mlckALLOCPXDLIST) */

                        pxdlistlock = (struct xdlistlock *) maplock;
                        pxd = pxdlistlock->xdlist;
                        for (n = 0; n < pxdlistlock->count; n++, pxd++) {
                                xaddr = addressPXD(pxd);
                                xlen = lengthPXD(pxd);
                                dbUpdatePMap(ipbmap, true, xaddr,
                                             (s64) xlen, tblk);
                                jfs_info("freePMap: xaddr:0x%lx xlen:%d",
                                         (ulong) xaddr, xlen);
                        }
                }
        }

        /*
         * free from working map;
         */
        if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) {
                if (maplock->flag & mlckFREEXADLIST) {
                        xadlistlock = (struct xdlistlock *) maplock;
                        xad = xadlistlock->xdlist;
                        for (n = 0; n < xadlistlock->count; n++, xad++) {
                                xaddr = addressXAD(xad);
                                xlen = lengthXAD(xad);
                                dbFree(ip, xaddr, (s64) xlen);
                                xad->flag = 0;
                                jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
                                         (ulong) xaddr, xlen);
                        }
                } else if (maplock->flag & mlckFREEPXD) {
                        pxdlock = (struct pxd_lock *) maplock;
                        xaddr = addressPXD(&pxdlock->pxd);
                        xlen = lengthPXD(&pxdlock->pxd);
                        dbFree(ip, xaddr, (s64) xlen);
                        jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
                                 (ulong) xaddr, xlen);
                } else {        /* (maplock->flag & mlckFREEPXDLIST) */

                        pxdlistlock = (struct xdlistlock *) maplock;
                        pxd = pxdlistlock->xdlist;
                        for (n = 0; n < pxdlistlock->count; n++, pxd++) {
                                xaddr = addressPXD(pxd);
                                xlen = lengthPXD(pxd);
                                dbFree(ip, xaddr, (s64) xlen);
                                jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
                                         (ulong) xaddr, xlen);
                        }
                }
        }
}

/*
 *        txFreelock()
 *
 * function:        remove tlock from inode anonymous locklist
 */
void txFreelock(struct inode *ip)
{
        struct jfs_inode_info *jfs_ip = JFS_IP(ip);
        struct tlock *xtlck, *tlck;
        lid_t xlid = 0, lid;

        if (!jfs_ip->atlhead)
                return;

        TXN_LOCK();
        xtlck = (struct tlock *) &jfs_ip->atlhead;

        while ((lid = xtlck->next) != 0) {
                tlck = lid_to_tlock(lid);
                if (tlck->flag & tlckFREELOCK) {
                        xtlck->next = tlck->next;
                        txLockFree(lid);
                } else {
                        xtlck = tlck;
                        xlid = lid;
                }
        }

        if (jfs_ip->atlhead)
                jfs_ip->atltail = xlid;
        else {
                jfs_ip->atltail = 0;
                /*
                 * If inode was on anon_list, remove it
                 */
                list_del_init(&jfs_ip->anon_inode_list);
        }
        TXN_UNLOCK();
}

/*
 *        txAbort()
 *
 * function: abort tx before commit;
 *
 * frees line-locks and segment locks for all
 * segments in comdata structure.
 * Optionally sets state of file-system to FM_DIRTY in super-block.
 * log age of page-frames in memory for which caller has
 * are reset to 0 (to avoid logwarap).
 */
void txAbort(tid_t tid, int dirty)
{
        lid_t lid, next;
        struct metapage *mp;
        struct tblock *tblk = tid_to_tblock(tid);
        struct tlock *tlck;

        /*
         * free tlocks of the transaction
         */
        for (lid = tblk->next; lid; lid = next) {
                tlck = lid_to_tlock(lid);
                next = tlck->next;
                mp = tlck->mp;
                JFS_IP(tlck->ip)->xtlid = 0;

                if (mp) {
                        mp->lid = 0;

                        /*
                         * reset lsn of page to avoid logwarap:
                         *
                         * (page may have been previously committed by another
                         * transaction(s) but has not been paged, i.e.,
                         * it may be on logsync list even though it has not
                         * been logged for the current tx.)
                         */
                        if (mp->xflag & COMMIT_PAGE && mp->lsn)
                                LogSyncRelease(mp);
                }
                /* insert tlock at head of freelist */
                TXN_LOCK();
                txLockFree(lid);
                TXN_UNLOCK();
        }

        /* caller will free the transaction block */

        tblk->next = tblk->last = 0;

        /*
         * mark filesystem dirty
         */
        if (dirty)
                jfs_error(tblk->sb, "txAbort");

        return;
}

/*
 *        txLazyCommit(void)
 *
 *        All transactions except those changing ipimap (COMMIT_FORCE) are
 *        processed by this routine.  This insures that the inode and block
 *        allocation maps are updated in order.  For synchronous transactions,
 *        let the user thread finish processing after txUpdateMap() is called.
 */
static void txLazyCommit(struct tblock * tblk)
{
        struct jfs_log *log;

        while (((tblk->flag & tblkGC_READY) == 0) &&
               ((tblk->flag & tblkGC_UNLOCKED) == 0)) {
                /* We must have gotten ahead of the user thread
                 */
                jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk);
                yield();
        }

        jfs_info("txLazyCommit: processing tblk 0x%p", tblk);

        txUpdateMap(tblk);

        log = (struct jfs_log *) JFS_SBI(tblk->sb)->log;

        spin_lock_irq(&log->gclock);        // LOGGC_LOCK

        tblk->flag |= tblkGC_COMMITTED;

        if (tblk->flag & tblkGC_READY)
                log->gcrtc--;

        wake_up_all(&tblk->gcwait);        // LOGGC_WAKEUP

        /*
         * Can't release log->gclock until we've tested tblk->flag
         */
        if (tblk->flag & tblkGC_LAZY) {
                spin_unlock_irq(&log->gclock);        // LOGGC_UNLOCK
                txUnlock(tblk);
                tblk->flag &= ~tblkGC_LAZY;
                txEnd(tblk - TxBlock);        /* Convert back to tid */
        } else
                spin_unlock_irq(&log->gclock);        // LOGGC_UNLOCK

        jfs_info("txLazyCommit: done: tblk = 0x%p", tblk);
}

/*
 *        jfs_lazycommit(void)
 *
 *        To be run as a kernel daemon.  If lbmIODone is called in an interrupt
 *        context, or where blocking is not wanted, this routine will process
 *        committed transactions from the unlock queue.
 */
int jfs_lazycommit(void *arg)
{
        int WorkDone;
        struct tblock *tblk;
        unsigned long flags;
        struct jfs_sb_info *sbi;

        do {
                LAZY_LOCK(flags);
                jfs_commit_thread_waking = 0;        /* OK to wake another thread */
                while (!list_empty(&TxAnchor.unlock_queue)) {
                        WorkDone = 0;
                        list_for_each_entry(tblk, &TxAnchor.unlock_queue,
                                            cqueue) {

                                sbi = JFS_SBI(tblk->sb);
                                /*
                                 * For each volume, the transactions must be
                                 * handled in order.  If another commit thread
                                 * is handling a tblk for this superblock,
                                 * skip it
                                 */
                                if (sbi->commit_state & IN_LAZYCOMMIT)
                                        continue;

                                sbi->commit_state |= IN_LAZYCOMMIT;
                                WorkDone = 1;

                                /*
                                 * Remove transaction from queue
                                 */
                                list_del(&tblk->cqueue);

                                LAZY_UNLOCK(flags);
                                txLazyCommit(tblk);
                                LAZY_LOCK(flags);

                                sbi->commit_state &= ~IN_LAZYCOMMIT;
                                /*
                                 * Don't continue in the for loop.  (We can't
                                 * anyway, it's unsafe!)  We want to go back to
                                 * the beginning of the list.
                                 */
                                break;
                        }

                        /* If there was nothing to do, don't continue */
                        if (!WorkDone)
                                break;
                }
                /* In case a wakeup came while all threads were active */
                jfs_commit_thread_waking = 0;

                if (freezing(current)) {
                        LAZY_UNLOCK(flags);
                        refrigerator();
                } else {
                        DECLARE_WAITQUEUE(wq, current);

                        add_wait_queue(&jfs_commit_thread_wait, &wq);
                        set_current_state(TASK_INTERRUPTIBLE);
                        LAZY_UNLOCK(flags);
                        schedule();
                        __set_current_state(TASK_RUNNING);
                        remove_wait_queue(&jfs_commit_thread_wait, &wq);
                }
        } while (!kthread_should_stop());

        if (!list_empty(&TxAnchor.unlock_queue))
                jfs_err("jfs_lazycommit being killed w/pending transactions!");
        else
                jfs_info("jfs_lazycommit being killed\n");
        return 0;
}

void txLazyUnlock(struct tblock * tblk)
{
        unsigned long flags;

        LAZY_LOCK(flags);

        list_add_tail(&tblk->cqueue, &TxAnchor.unlock_queue);
        /*
         * Don't wake up a commit thread if there is already one servicing
         * this superblock, or if the last one we woke up hasn't started yet.
         */
        if (!(JFS_SBI(tblk->sb)->commit_state & IN_LAZYCOMMIT) &&
            !jfs_commit_thread_waking) {
                jfs_commit_thread_waking = 1;
                wake_up(&jfs_commit_thread_wait);
        }
        LAZY_UNLOCK(flags);
}

static void LogSyncRelease(struct metapage * mp)
{
        struct jfs_log *log = mp->log;

        assert(mp->nohomeok);
        assert(log);
        metapage_homeok(mp);
}

/*
 *        txQuiesce
 *
 *        Block all new transactions and push anonymous transactions to
 *        completion
 *
 *        This does almost the same thing as jfs_sync below.  We don't
 *        worry about deadlocking when jfs_tlocks_low is set, since we would
 *        expect jfs_sync to get us out of that jam.
 */
void txQuiesce(struct super_block *sb)
{
        struct inode *ip;
        struct jfs_inode_info *jfs_ip;
        struct jfs_log *log = JFS_SBI(sb)->log;
        tid_t tid;

        set_bit(log_QUIESCE, &log->flag);

        TXN_LOCK();
restart:
        while (!list_empty(&TxAnchor.anon_list)) {
                jfs_ip = list_entry(TxAnchor.anon_list.next,
                                    struct jfs_inode_info,
                                    anon_inode_list);
                ip = &jfs_ip->vfs_inode;

                /*
                 * inode will be removed from anonymous list
                 * when it is committed
                 */
                TXN_UNLOCK();
                tid = txBegin(ip->i_sb, COMMIT_INODE | COMMIT_FORCE);
                mutex_lock(&jfs_ip->commit_mutex);
                txCommit(tid, 1, &ip, 0);
                txEnd(tid);
                mutex_unlock(&jfs_ip->commit_mutex);
                /*
                 * Just to be safe.  I don't know how
                 * long we can run without blocking
                 */
                cond_resched();
                TXN_LOCK();
        }

        /*
         * If jfs_sync is running in parallel, there could be some inodes
         * on anon_list2.  Let's check.
         */
        if (!list_empty(&TxAnchor.anon_list2)) {
                list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list);
                INIT_LIST_HEAD(&TxAnchor.anon_list2);
                goto restart;
        }
        TXN_UNLOCK();

        /*
         * We may need to kick off the group commit
         */
        jfs_flush_journal(log, 0);
}

/*
 * txResume()
 *
 * Allows transactions to start again following txQuiesce
 */
void txResume(struct super_block *sb)
{
        struct jfs_log *log = JFS_SBI(sb)->log;

        clear_bit(log_QUIESCE, &log->flag);
        TXN_WAKEUP(&log->syncwait);
}

/*
 *        jfs_sync(void)
 *
 *        To be run as a kernel daemon.  This is awakened when tlocks run low.
 *        We write any inodes that have anonymous tlocks so they will become
 *        available.
 */
int jfs_sync(void *arg)
{
        struct inode *ip;
        struct jfs_inode_info *jfs_ip;
        int rc;
        tid_t tid;

        do {
                /*
                 * write each inode on the anonymous inode list
                 */
                TXN_LOCK();
                while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) {
                        jfs_ip = list_entry(TxAnchor.anon_list.next,
                                            struct jfs_inode_info,
                                            anon_inode_list);
                        ip = &jfs_ip->vfs_inode;

                        if (! igrab(ip)) {
                                /*
                                 * Inode is being freed
                                 */
                                list_del_init(&jfs_ip->anon_inode_list);
                        } else if (mutex_trylock(&jfs_ip->commit_mutex)) {
                                /*
                                 * inode will be removed from anonymous list
                                 * when it is committed
                                 */
                                TXN_UNLOCK();
                                tid = txBegin(ip->i_sb, COMMIT_INODE);
                                rc = txCommit(tid, 1, &ip, 0);
                                txEnd(tid);
                                mutex_unlock(&jfs_ip->commit_mutex);

                                iput(ip);
                                /*
                                 * Just to be safe.  I don't know how
                                 * long we can run without blocking
                                 */
                                cond_resched();
                                TXN_LOCK();
                        } else {
                                /* We can't get the commit mutex.  It may
                                 * be held by a thread waiting for tlock's
                                 * so let's not block here.  Save it to
                                 * put back on the anon_list.
                                 */

                                /* Take off anon_list */
                                list_del(&jfs_ip->anon_inode_list);

                                /* Put on anon_list2 */
                                list_add(&jfs_ip->anon_inode_list,
                                         &TxAnchor.anon_list2);

                                TXN_UNLOCK();
                                iput(ip);
                                TXN_LOCK();
                        }
                }
                /* Add anon_list2 back to anon_list */
                list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);

                if (freezing(current)) {
                        TXN_UNLOCK();
                        refrigerator();
                } else {
                        set_current_state(TASK_INTERRUPTIBLE);
                        TXN_UNLOCK();
                        schedule();
                        __set_current_state(TASK_RUNNING);
                }
        } while (!kthread_should_stop());

        jfs_info("jfs_sync being killed");
        return 0;
}

#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
static int jfs_txanchor_proc_show(struct seq_file *m, void *v)
{
        char *freewait;
        char *freelockwait;
        char *lowlockwait;

        freewait =
            waitqueue_active(&TxAnchor.freewait) ? "active" : "empty";
        freelockwait =
            waitqueue_active(&TxAnchor.freelockwait) ? "active" : "empty";
        lowlockwait =
            waitqueue_active(&TxAnchor.lowlockwait) ? "active" : "empty";

        seq_printf(m,
                       "JFS TxAnchor\n"
                       "============\n"
                       "freetid = %d\n"
                       "freewait = %s\n"
                       "freelock = %d\n"
                       "freelockwait = %s\n"
                       "lowlockwait = %s\n"
                       "tlocksInUse = %d\n"
                       "jfs_tlocks_low = %d\n"
                       "unlock_queue is %sempty\n",
                       TxAnchor.freetid,
                       freewait,
                       TxAnchor.freelock,
                       freelockwait,
                       lowlockwait,
                       TxAnchor.tlocksInUse,
                       jfs_tlocks_low,
                       list_empty(&TxAnchor.unlock_queue) ? "" : "not ");
        return 0;
}

static int jfs_txanchor_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, jfs_txanchor_proc_show, NULL);
}

const struct file_operations jfs_txanchor_proc_fops = {
        .owner                = THIS_MODULE,
        .open                = jfs_txanchor_proc_open,
        .read                = seq_read,
        .llseek                = seq_lseek,
        .release        = single_release,
};
#endif

#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
static int jfs_txstats_proc_show(struct seq_file *m, void *v)
{
        seq_printf(m,
                       "JFS TxStats\n"
                       "===========\n"
                       "calls to txBegin = %d\n"
                       "txBegin blocked by sync barrier = %d\n"
                       "txBegin blocked by tlocks low = %d\n"
                       "txBegin blocked by no free tid = %d\n"
                       "calls to txBeginAnon = %d\n"
                       "txBeginAnon blocked by sync barrier = %d\n"
                       "txBeginAnon blocked by tlocks low = %d\n"
                       "calls to txLockAlloc = %d\n"
                       "tLockAlloc blocked by no free lock = %d\n",
                       TxStat.txBegin,
                       TxStat.txBegin_barrier,
                       TxStat.txBegin_lockslow,
                       TxStat.txBegin_freetid,
                       TxStat.txBeginAnon,
                       TxStat.txBeginAnon_barrier,
                       TxStat.txBeginAnon_lockslow,
                       TxStat.txLockAlloc,
                       TxStat.txLockAlloc_freelock);
        return 0;
}

static int jfs_txstats_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, jfs_txstats_proc_show, NULL);
}

const struct file_operations jfs_txstats_proc_fops = {
        .owner                = THIS_MODULE,
        .open                = jfs_txstats_proc_open,
        .read                = seq_read,
        .llseek                = seq_lseek,
        .release        = single_release,
};
#endif