Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3054 insertions, 0 deletions

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
new file mode 100644
index 000000000..6f6a5b920
--- /dev/null
+++ b/fs/jfs/jfs_txnmgr.c
@@ -0,0 +1,3054 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) International Business Machines Corp., 2000-2005
+ *   Portions Copyright (C) Christoph Hellwig, 2001-2002
+ */
+
+/*
+ *	jfs_txnmgr.c: transaction manager
+ *
+ * notes:
+ * transaction starts with txBegin() and ends with txCommit()
+ * or txAbort().
+ *
+ * tlock is acquired at the time of update;
+ * (obviate scan at commit time for xtree and dtree)
+ * tlock and mp points to each other;
+ * (no hashlist for mp -> tlock).
+ *
+ * special cases:
+ * tlock on in-memory inode:
+ * in-place tlock in the in-memory inode itself;
+ * converted to page lock by iWrite() at commit time.
+ *
+ * tlock during write()/mmap() under anonymous transaction (tid = 0):
+ * transferred (?) to transaction at commit time.
+ *
+ * use the page itself to update allocation maps
+ * (obviate intermediate replication of allocation/deallocation data)
+ * hold on to mp+lock thru update of maps
+ */
+
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+#include <linux/completion.h>
+#include <linux/freezer.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kthread.h>
+#include <linux/seq_file.h>
+#include "jfs_incore.h"
+#include "jfs_inode.h"
+#include "jfs_filsys.h"
+#include "jfs_metapage.h"
+#include "jfs_dinode.h"
+#include "jfs_imap.h"
+#include "jfs_dmap.h"
+#include "jfs_superblock.h"
+#include "jfs_debug.h"
+
+/*
+ *	transaction management structures
+ */
+static struct {
+	int freetid;		/* index of a free tid structure */
+	int freelock;		/* index first free lock word */
+	wait_queue_head_t freewait;	/* eventlist of free tblock */
+	wait_queue_head_t freelockwait;	/* eventlist of free tlock */
+	wait_queue_head_t lowlockwait;	/* eventlist of ample tlocks */
+	int tlocksInUse;	/* Number of tlocks in use */
+	spinlock_t LazyLock;	/* synchronize sync_queue & unlock_queue */
+/*	struct tblock *sync_queue; * Transactions waiting for data sync */
+	struct list_head unlock_queue;	/* Txns waiting to be released */
+	struct list_head anon_list;	/* inodes having anonymous txns */
+	struct list_head anon_list2;	/* inodes having anonymous txns
+					   that couldn't be sync'ed */
+} TxAnchor;
+
+int jfs_tlocks_low;		/* Indicates low number of available tlocks */
+
+#ifdef CONFIG_JFS_STATISTICS
+static struct {
+	uint txBegin;
+	uint txBegin_barrier;
+	uint txBegin_lockslow;
+	uint txBegin_freetid;
+	uint txBeginAnon;
+	uint txBeginAnon_barrier;
+	uint txBeginAnon_lockslow;
+	uint txLockAlloc;
+	uint txLockAlloc_freelock;
+} TxStat;
+#endif
+
+static int nTxBlock = -1;	/* number of transaction blocks */
+module_param(nTxBlock, int, 0);
+MODULE_PARM_DESC(nTxBlock,
+		 "Number of transaction blocks (max:65536)");
+
+static int nTxLock = -1;	/* number of transaction locks */
+module_param(nTxLock, int, 0);
+MODULE_PARM_DESC(nTxLock,
+		 "Number of transaction locks (max:65536)");
+
+struct tblock *TxBlock;	/* transaction block table */
+static int TxLockLWM;	/* Low water mark for number of txLocks used */
+static int TxLockHWM;	/* High water mark for number of txLocks used */
+static int TxLockVHWM;	/* Very High water mark */
+struct tlock *TxLock;	/* transaction lock table */
+
+/*
+ *	transaction management lock
+ */
+static DEFINE_SPINLOCK(jfsTxnLock);
+
+#define TXN_LOCK()		spin_lock(&jfsTxnLock)
+#define TXN_UNLOCK()		spin_unlock(&jfsTxnLock)
+
+#define LAZY_LOCK_INIT()	spin_lock_init(&TxAnchor.LazyLock);
+#define LAZY_LOCK(flags)	spin_lock_irqsave(&TxAnchor.LazyLock, flags)
+#define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
+
+static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait);
+static int jfs_commit_thread_waking;
+
+/*
+ * Retry logic exist outside these macros to protect from spurrious wakeups.
+ */
+static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	add_wait_queue(event, &wait);
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	TXN_UNLOCK();
+	io_schedule();
+	remove_wait_queue(event, &wait);
+}
+
+#define TXN_SLEEP(event)\
+{\
+	TXN_SLEEP_DROP_LOCK(event);\
+	TXN_LOCK();\
+}
+
+#define TXN_WAKEUP(event) wake_up_all(event)
+
+/*
+ *	statistics
+ */
+static struct {
+	tid_t maxtid;		/* 4: biggest tid ever used */
+	lid_t maxlid;		/* 4: biggest lid ever used */
+	int ntid;		/* 4: # of transactions performed */
+	int nlid;		/* 4: # of tlocks acquired */
+	int waitlock;		/* 4: # of tlock wait */
+} stattx;
+
+/*
+ * forward references
+ */
+static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		struct tlock * tlck, struct commit * cd);
+static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		struct tlock * tlck);
+static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		struct tlock * tlck);
+static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		struct tlock * tlck);
+static void txAllocPMap(struct inode *ip, struct maplock * maplock,
+		struct tblock * tblk);
+static void txForce(struct tblock * tblk);
+static int txLog(struct jfs_log * log, struct tblock * tblk,
+		struct commit * cd);
+static void txUpdateMap(struct tblock * tblk);
+static void txRelease(struct tblock * tblk);
+static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+	   struct tlock * tlck);
+static void LogSyncRelease(struct metapage * mp);
+
+/*
+ *		transaction block/lock management
+ *		---------------------------------
+ */
+
+/*
+ * Get a transaction lock from the free list.  If the number in use is
+ * greater than the high water mark, wake up the sync daemon.  This should
+ * free some anonymous transaction locks.  (TXN_LOCK must be held.)
+ */
+static lid_t txLockAlloc(void)
+{
+	lid_t lid;
+
+	INCREMENT(TxStat.txLockAlloc);
+	if (!TxAnchor.freelock) {
+		INCREMENT(TxStat.txLockAlloc_freelock);
+	}
+
+	while (!(lid = TxAnchor.freelock))
+		TXN_SLEEP(&TxAnchor.freelockwait);
+	TxAnchor.freelock = TxLock[lid].next;
+	HIGHWATERMARK(stattx.maxlid, lid);
+	if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) {
+		jfs_info("txLockAlloc tlocks low");
+		jfs_tlocks_low = 1;
+		wake_up_process(jfsSyncThread);
+	}
+
+	return lid;
+}
+
+static void txLockFree(lid_t lid)
+{
+	TxLock[lid].tid = 0;
+	TxLock[lid].next = TxAnchor.freelock;
+	TxAnchor.freelock = lid;
+	TxAnchor.tlocksInUse--;
+	if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) {
+		jfs_info("txLockFree jfs_tlocks_low no more");
+		jfs_tlocks_low = 0;
+		TXN_WAKEUP(&TxAnchor.lowlockwait);
+	}
+	TXN_WAKEUP(&TxAnchor.freelockwait);
+}
+
+/*
+ * NAME:	txInit()
+ *
+ * FUNCTION:	initialize transaction management structures
+ *
+ * RETURN:
+ *
+ * serialization: single thread at jfs_init()
+ */
+int txInit(void)
+{
+	int k, size;
+	struct sysinfo si;
+
+	/* Set defaults for nTxLock and nTxBlock if unset */
+
+	if (nTxLock == -1) {
+		if (nTxBlock == -1) {
+			/* Base default on memory size */
+			si_meminfo(&si);
+			if (si.totalram > (256 * 1024)) /* 1 GB */
+				nTxLock = 64 * 1024;
+			else
+				nTxLock = si.totalram >> 2;
+		} else if (nTxBlock > (8 * 1024))
+			nTxLock = 64 * 1024;
+		else
+			nTxLock = nTxBlock << 3;
+	}
+	if (nTxBlock == -1)
+		nTxBlock = nTxLock >> 3;
+
+	/* Verify tunable parameters */
+	if (nTxBlock < 16)
+		nTxBlock = 16;	/* No one should set it this low */
+	if (nTxBlock > 65536)
+		nTxBlock = 65536;
+	if (nTxLock < 256)
+		nTxLock = 256;	/* No one should set it this low */
+	if (nTxLock > 65536)
+		nTxLock = 65536;
+
+	printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n",
+	       nTxBlock, nTxLock);
+	/*
+	 * initialize transaction block (tblock) table
+	 *
+	 * transaction id (tid) = tblock index
+	 * tid = 0 is reserved.
+	 */
+	TxLockLWM = (nTxLock * 4) / 10;
+	TxLockHWM = (nTxLock * 7) / 10;
+	TxLockVHWM = (nTxLock * 8) / 10;
+
+	size = sizeof(struct tblock) * nTxBlock;
+	TxBlock = vmalloc(size);
+	if (TxBlock == NULL)
+		return -ENOMEM;
+
+	for (k = 1; k < nTxBlock - 1; k++) {
+		TxBlock[k].next = k + 1;
+		init_waitqueue_head(&TxBlock[k].gcwait);
+		init_waitqueue_head(&TxBlock[k].waitor);
+	}
+	TxBlock[k].next = 0;
+	init_waitqueue_head(&TxBlock[k].gcwait);
+	init_waitqueue_head(&TxBlock[k].waitor);
+
+	TxAnchor.freetid = 1;
+	init_waitqueue_head(&TxAnchor.freewait);
+
+	stattx.maxtid = 1;	/* statistics */
+
+	/*
+	 * initialize transaction lock (tlock) table
+	 *
+	 * transaction lock id = tlock index
+	 * tlock id = 0 is reserved.
+	 */
+	size = sizeof(struct tlock) * nTxLock;
+	TxLock = vmalloc(size);
+	if (TxLock == NULL) {
+		vfree(TxBlock);
+		return -ENOMEM;
+	}
+
+	/* initialize tlock table */
+	for (k = 1; k < nTxLock - 1; k++)
+		TxLock[k].next = k + 1;
+	TxLock[k].next = 0;
+	init_waitqueue_head(&TxAnchor.freelockwait);
+	init_waitqueue_head(&TxAnchor.lowlockwait);
+
+	TxAnchor.freelock = 1;
+	TxAnchor.tlocksInUse = 0;
+	INIT_LIST_HEAD(&TxAnchor.anon_list);
+	INIT_LIST_HEAD(&TxAnchor.anon_list2);
+
+	LAZY_LOCK_INIT();
+	INIT_LIST_HEAD(&TxAnchor.unlock_queue);
+
+	stattx.maxlid = 1;	/* statistics */
+
+	return 0;
+}
+
+/*
+ * NAME:	txExit()
+ *
+ * FUNCTION:	clean up when module is unloaded
+ */
+void txExit(void)
+{
+	vfree(TxLock);
+	TxLock = NULL;
+	vfree(TxBlock);
+	TxBlock = NULL;
+}
+
+/*
+ * NAME:	txBegin()
+ *
+ * FUNCTION:	start a transaction.
+ *
+ * PARAMETER:	sb	- superblock
+ *		flag	- force for nested tx;
+ *
+ * RETURN:	tid	- transaction id
+ *
+ * note: flag force allows to start tx for nested tx
+ * to prevent deadlock on logsync barrier;
+ */
+tid_t txBegin(struct super_block *sb, int flag)
+{
+	tid_t t;
+	struct tblock *tblk;
+	struct jfs_log *log;
+
+	jfs_info("txBegin: flag = 0x%x", flag);
+	log = JFS_SBI(sb)->log;
+
+	if (!log) {
+		jfs_error(sb, "read-only filesystem\n");
+		return 0;
+	}
+
+	TXN_LOCK();
+
+	INCREMENT(TxStat.txBegin);
+
+      retry:
+	if (!(flag & COMMIT_FORCE)) {
+		/*
+		 * synchronize with logsync barrier
+		 */
+		if (test_bit(log_SYNCBARRIER, &log->flag) ||
+		    test_bit(log_QUIESCE, &log->flag)) {
+			INCREMENT(TxStat.txBegin_barrier);
+			TXN_SLEEP(&log->syncwait);
+			goto retry;
+		}
+	}
+	if (flag == 0) {
+		/*
+		 * Don't begin transaction if we're getting starved for tlocks
+		 * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
+		 * free tlocks)
+		 */
+		if (TxAnchor.tlocksInUse > TxLockVHWM) {
+			INCREMENT(TxStat.txBegin_lockslow);
+			TXN_SLEEP(&TxAnchor.lowlockwait);
+			goto retry;
+		}
+	}
+
+	/*
+	 * allocate transaction id/block
+	 */
+	if ((t = TxAnchor.freetid) == 0) {
+		jfs_info("txBegin: waiting for free tid");
+		INCREMENT(TxStat.txBegin_freetid);
+		TXN_SLEEP(&TxAnchor.freewait);
+		goto retry;
+	}
+
+	tblk = tid_to_tblock(t);
+
+	if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) {
+		/* Don't let a non-forced transaction take the last tblk */
+		jfs_info("txBegin: waiting for free tid");
+		INCREMENT(TxStat.txBegin_freetid);
+		TXN_SLEEP(&TxAnchor.freewait);
+		goto retry;
+	}
+
+	TxAnchor.freetid = tblk->next;
+
+	/*
+	 * initialize transaction
+	 */
+
+	/*
+	 * We can't zero the whole thing or we screw up another thread being
+	 * awakened after sleeping on tblk->waitor
+	 *
+	 * memset(tblk, 0, sizeof(struct tblock));
+	 */
+	tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0;
+
+	tblk->sb = sb;
+	++log->logtid;
+	tblk->logtid = log->logtid;
+
+	++log->active;
+
+	HIGHWATERMARK(stattx.maxtid, t);	/* statistics */
+	INCREMENT(stattx.ntid);	/* statistics */
+
+	TXN_UNLOCK();
+
+	jfs_info("txBegin: returning tid = %d", t);
+
+	return t;
+}
+
+/*
+ * NAME:	txBeginAnon()
+ *
+ * FUNCTION:	start an anonymous transaction.
+ *		Blocks if logsync or available tlocks are low to prevent
+ *		anonymous tlocks from depleting supply.
+ *
+ * PARAMETER:	sb	- superblock
+ *
+ * RETURN:	none
+ */
+void txBeginAnon(struct super_block *sb)
+{
+	struct jfs_log *log;
+
+	log = JFS_SBI(sb)->log;
+
+	TXN_LOCK();
+	INCREMENT(TxStat.txBeginAnon);
+
+      retry:
+	/*
+	 * synchronize with logsync barrier
+	 */
+	if (test_bit(log_SYNCBARRIER, &log->flag) ||
+	    test_bit(log_QUIESCE, &log->flag)) {
+		INCREMENT(TxStat.txBeginAnon_barrier);
+		TXN_SLEEP(&log->syncwait);
+		goto retry;
+	}
+
+	/*
+	 * Don't begin transaction if we're getting starved for tlocks
+	 */
+	if (TxAnchor.tlocksInUse > TxLockVHWM) {
+		INCREMENT(TxStat.txBeginAnon_lockslow);
+		TXN_SLEEP(&TxAnchor.lowlockwait);
+		goto retry;
+	}
+	TXN_UNLOCK();
+}
+
+/*
+ *	txEnd()
+ *
+ * function: free specified transaction block.
+ *
+ *	logsync barrier processing:
+ *
+ * serialization:
+ */
+void txEnd(tid_t tid)
+{
+	struct tblock *tblk = tid_to_tblock(tid);
+	struct jfs_log *log;
+
+	jfs_info("txEnd: tid = %d", tid);
+	TXN_LOCK();
+
+	/*
+	 * wakeup transactions waiting on the page locked
+	 * by the current transaction
+	 */
+	TXN_WAKEUP(&tblk->waitor);
+
+	log = JFS_SBI(tblk->sb)->log;
+
+	/*
+	 * Lazy commit thread can't free this guy until we mark it UNLOCKED,
+	 * otherwise, we would be left with a transaction that may have been
+	 * reused.
+	 *
+	 * Lazy commit thread will turn off tblkGC_LAZY before calling this
+	 * routine.
+	 */
+	if (tblk->flag & tblkGC_LAZY) {
+		jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk);
+		TXN_UNLOCK();
+
+		spin_lock_irq(&log->gclock);	// LOGGC_LOCK
+		tblk->flag |= tblkGC_UNLOCKED;
+		spin_unlock_irq(&log->gclock);	// LOGGC_UNLOCK
+		return;
+	}
+
+	jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk);
+
+	assert(tblk->next == 0);
+
+	/*
+	 * insert tblock back on freelist
+	 */
+	tblk->next = TxAnchor.freetid;
+	TxAnchor.freetid = tid;
+
+	/*
+	 * mark the tblock not active
+	 */
+	if (--log->active == 0) {
+		clear_bit(log_FLUSH, &log->flag);
+
+		/*
+		 * synchronize with logsync barrier
+		 */
+		if (test_bit(log_SYNCBARRIER, &log->flag)) {
+			TXN_UNLOCK();
+
+			/* write dirty metadata & forward log syncpt */
+			jfs_syncpt(log, 1);
+
+			jfs_info("log barrier off: 0x%x", log->lsn);
+
+			/* enable new transactions start */
+			clear_bit(log_SYNCBARRIER, &log->flag);
+
+			/* wakeup all waitors for logsync barrier */
+			TXN_WAKEUP(&log->syncwait);
+
+			goto wakeup;
+		}
+	}
+
+	TXN_UNLOCK();
+wakeup:
+	/*
+	 * wakeup all waitors for a free tblock
+	 */
+	TXN_WAKEUP(&TxAnchor.freewait);
+}
+
+/*
+ *	txLock()
+ *
+ * function: acquire a transaction lock on the specified <mp>
+ *
+ * parameter:
+ *
+ * return:	transaction lock id
+ *
+ * serialization:
+ */
+struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
+		     int type)
+{
+	struct jfs_inode_info *jfs_ip = JFS_IP(ip);
+	int dir_xtree = 0;
+	lid_t lid;
+	tid_t xtid;
+	struct tlock *tlck;
+	struct xtlock *xtlck;
+	struct linelock *linelock;
+	xtpage_t *p;
+	struct tblock *tblk;
+
+	TXN_LOCK();
+
+	if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) &&
+	    !(mp->xflag & COMMIT_PAGE)) {
+		/*
+		 * Directory inode is special.  It can have both an xtree tlock
+		 * and a dtree tlock associated with it.
+		 */
+		dir_xtree = 1;
+		lid = jfs_ip->xtlid;
+	} else
+		lid = mp->lid;
+
+	/* is page not locked by a transaction ? */
+	if (lid == 0)
+		goto allocateLock;
+
+	jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid);
+
+	/* is page locked by the requester transaction ? */
+	tlck = lid_to_tlock(lid);
+	if ((xtid = tlck->tid) == tid) {
+		TXN_UNLOCK();
+		goto grantLock;
+	}
+
+	/*
+	 * is page locked by anonymous transaction/lock ?
+	 *
+	 * (page update without transaction (i.e., file write) is
+	 * locked under anonymous transaction tid = 0:
+	 * anonymous tlocks maintained on anonymous tlock list of
+	 * the inode of the page and available to all anonymous
+	 * transactions until txCommit() time at which point
+	 * they are transferred to the transaction tlock list of
+	 * the committing transaction of the inode)
+	 */
+	if (xtid == 0) {
+		tlck->tid = tid;
+		TXN_UNLOCK();
+		tblk = tid_to_tblock(tid);
+		/*
+		 * The order of the tlocks in the transaction is important
+		 * (during truncate, child xtree pages must be freed before
+		 * parent's tlocks change the working map).
+		 * Take tlock off anonymous list and add to tail of
+		 * transaction list
+		 *
+		 * Note:  We really need to get rid of the tid & lid and
+		 * use list_head's.  This code is getting UGLY!
+		 */
+		if (jfs_ip->atlhead == lid) {
+			if (jfs_ip->atltail == lid) {
+				/* only anonymous txn.
+				 * Remove from anon_list
+				 */
+				TXN_LOCK();
+				list_del_init(&jfs_ip->anon_inode_list);
+				TXN_UNLOCK();
+			}
+			jfs_ip->atlhead = tlck->next;
+		} else {
+			lid_t last;
+			for (last = jfs_ip->atlhead;
+			     lid_to_tlock(last)->next != lid;
+			     last = lid_to_tlock(last)->next) {
+				assert(last);
+			}
+			lid_to_tlock(last)->next = tlck->next;
+			if (jfs_ip->atltail == lid)
+				jfs_ip->atltail = last;
+		}
+
+		/* insert the tlock at tail of transaction tlock list */
+
+		if (tblk->next)
+			lid_to_tlock(tblk->last)->next = lid;
+		else
+			tblk->next = lid;
+		tlck->next = 0;
+		tblk->last = lid;
+
+		goto grantLock;
+	}
+
+	goto waitLock;
+
+	/*
+	 * allocate a tlock
+	 */
+      allocateLock:
+	lid = txLockAlloc();
+	tlck = lid_to_tlock(lid);
+
+	/*
+	 * initialize tlock
+	 */
+	tlck->tid = tid;
+
+	TXN_UNLOCK();
+
+	/* mark tlock for meta-data page */
+	if (mp->xflag & COMMIT_PAGE) {
+
+		tlck->flag = tlckPAGELOCK;
+
+		/* mark the page dirty and nohomeok */
+		metapage_nohomeok(mp);
+
+		jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
+			 mp, mp->nohomeok, tid, tlck);
+
+		/* if anonymous transaction, and buffer is on the group
+		 * commit synclist, mark inode to show this.  This will
+		 * prevent the buffer from being marked nohomeok for too
+		 * long a time.
+		 */
+		if ((tid == 0) && mp->lsn)
+			set_cflag(COMMIT_Synclist, ip);
+	}
+	/* mark tlock for in-memory inode */
+	else
+		tlck->flag = tlckINODELOCK;
+
+	if (S_ISDIR(ip->i_mode))
+		tlck->flag |= tlckDIRECTORY;
+
+	tlck->type = 0;
+
+	/* bind the tlock and the page */
+	tlck->ip = ip;
+	tlck->mp = mp;
+	if (dir_xtree)
+		jfs_ip->xtlid = lid;
+	else
+		mp->lid = lid;
+
+	/*
+	 * enqueue transaction lock to transaction/inode
+	 */
+	/* insert the tlock at tail of transaction tlock list */
+	if (tid) {
+		tblk = tid_to_tblock(tid);
+		if (tblk->next)
+			lid_to_tlock(tblk->last)->next = lid;
+		else
+			tblk->next = lid;
+		tlck->next = 0;
+		tblk->last = lid;
+	}
+	/* anonymous transaction:
+	 * insert the tlock at head of inode anonymous tlock list
+	 */
+	else {
+		tlck->next = jfs_ip->atlhead;
+		jfs_ip->atlhead = lid;
+		if (tlck->next == 0) {
+			/* This inode's first anonymous transaction */
+			jfs_ip->atltail = lid;
+			TXN_LOCK();
+			list_add_tail(&jfs_ip->anon_inode_list,
+				      &TxAnchor.anon_list);
+			TXN_UNLOCK();
+		}
+	}
+
+	/* initialize type dependent area for linelock */
+	linelock = (struct linelock *) & tlck->lock;
+	linelock->next = 0;
+	linelock->flag = tlckLINELOCK;
+	linelock->maxcnt = TLOCKSHORT;
+	linelock->index = 0;
+
+	switch (type & tlckTYPE) {
+	case tlckDTREE:
+		linelock->l2linesize = L2DTSLOTSIZE;
+		break;
+
+	case tlckXTREE:
+		linelock->l2linesize = L2XTSLOTSIZE;
+
+		xtlck = (struct xtlock *) linelock;
+		xtlck->header.offset = 0;
+		xtlck->header.length = 2;
+
+		if (type & tlckNEW) {
+			xtlck->lwm.offset = XTENTRYSTART;
+		} else {
+			if (mp->xflag & COMMIT_PAGE)
+				p = (xtpage_t *) mp->data;
+			else
+				p = &jfs_ip->i_xtroot;
+			xtlck->lwm.offset =
+			    le16_to_cpu(p->header.nextindex);
+		}
+		xtlck->lwm.length = 0;	/* ! */
+		xtlck->twm.offset = 0;
+		xtlck->hwm.offset = 0;
+
+		xtlck->index = 2;
+		break;
+
+	case tlckINODE:
+		linelock->l2linesize = L2INODESLOTSIZE;
+		break;
+
+	case tlckDATA:
+		linelock->l2linesize = L2DATASLOTSIZE;
+		break;
+
+	default:
+		jfs_err("UFO tlock:0x%p", tlck);
+	}
+
+	/*
+	 * update tlock vector
+	 */
+      grantLock:
+	tlck->type |= type;
+
+	return tlck;
+
+	/*
+	 * page is being locked by another transaction:
+	 */
+      waitLock:
+	/* Only locks on ipimap or ipaimap should reach here */
+	/* assert(jfs_ip->fileset == AGGREGATE_I); */
+	if (jfs_ip->fileset != AGGREGATE_I) {
+		printk(KERN_ERR "txLock: trying to lock locked page!");
+		print_hex_dump(KERN_ERR, "ip: ", DUMP_PREFIX_ADDRESS, 16, 4,
+			       ip, sizeof(*ip), 0);
+		print_hex_dump(KERN_ERR, "mp: ", DUMP_PREFIX_ADDRESS, 16, 4,
+			       mp, sizeof(*mp), 0);
+		print_hex_dump(KERN_ERR, "Locker's tblock: ",
+			       DUMP_PREFIX_ADDRESS, 16, 4, tid_to_tblock(tid),
+			       sizeof(struct tblock), 0);
+		print_hex_dump(KERN_ERR, "Tlock: ", DUMP_PREFIX_ADDRESS, 16, 4,
+			       tlck, sizeof(*tlck), 0);
+		BUG();
+	}
+	INCREMENT(stattx.waitlock);	/* statistics */
+	TXN_UNLOCK();
+	release_metapage(mp);
+	TXN_LOCK();
+	xtid = tlck->tid;	/* reacquire after dropping TXN_LOCK */
+
+	jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
+		 tid, xtid, lid);
+
+	/* Recheck everything since dropping TXN_LOCK */
+	if (xtid && (tlck->mp == mp) && (mp->lid == lid))
+		TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
+	else
+		TXN_UNLOCK();
+	jfs_info("txLock: awakened     tid = %d, lid = %d", tid, lid);
+
+	return NULL;
+}
+
+/*
+ * NAME:	txRelease()
+ *
+ * FUNCTION:	Release buffers associated with transaction locks, but don't
+ *		mark homeok yet.  The allows other transactions to modify
+ *		buffers, but won't let them go to disk until commit record
+ *		actually gets written.
+ *
+ * PARAMETER:
+ *		tblk	-
+ *
+ * RETURN:	Errors from subroutines.
+ */
+static void txRelease(struct tblock * tblk)
+{
+	struct metapage *mp;
+	lid_t lid;
+	struct tlock *tlck;
+
+	TXN_LOCK();
+
+	for (lid = tblk->next; lid; lid = tlck->next) {
+		tlck = lid_to_tlock(lid);
+		if ((mp = tlck->mp) != NULL &&
+		    (tlck->type & tlckBTROOT) == 0) {
+			assert(mp->xflag & COMMIT_PAGE);
+			mp->lid = 0;
+		}
+	}
+
+	/*
+	 * wakeup transactions waiting on a page locked
+	 * by the current transaction
+	 */
+	TXN_WAKEUP(&tblk->waitor);
+
+	TXN_UNLOCK();
+}
+
+/*
+ * NAME:	txUnlock()
+ *
+ * FUNCTION:	Initiates pageout of pages modified by tid in journalled
+ *		objects and frees their lockwords.
+ */
+static void txUnlock(struct tblock * tblk)
+{
+	struct tlock *tlck;
+	struct linelock *linelock;
+	lid_t lid, next, llid, k;
+	struct metapage *mp;
+	struct jfs_log *log;
+	int difft, diffp;
+	unsigned long flags;
+
+	jfs_info("txUnlock: tblk = 0x%p", tblk);
+	log = JFS_SBI(tblk->sb)->log;
+
+	/*
+	 * mark page under tlock homeok (its log has been written):
+	 */
+	for (lid = tblk->next; lid; lid = next) {
+		tlck = lid_to_tlock(lid);
+		next = tlck->next;
+
+		jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck);
+
+		/* unbind page from tlock */
+		if ((mp = tlck->mp) != NULL &&
+		    (tlck->type & tlckBTROOT) == 0) {
+			assert(mp->xflag & COMMIT_PAGE);
+
+			/* hold buffer
+			 */
+			hold_metapage(mp);
+
+			assert(mp->nohomeok > 0);
+			_metapage_homeok(mp);
+
+			/* inherit younger/larger clsn */
+			LOGSYNC_LOCK(log, flags);
+			if (mp->clsn) {
+				logdiff(difft, tblk->clsn, log);
+				logdiff(diffp, mp->clsn, log);
+				if (difft > diffp)
+					mp->clsn = tblk->clsn;
+			} else
+				mp->clsn = tblk->clsn;
+			LOGSYNC_UNLOCK(log, flags);
+
+			assert(!(tlck->flag & tlckFREEPAGE));
+
+			put_metapage(mp);
+		}
+
+		/* insert tlock, and linelock(s) of the tlock if any,
+		 * at head of freelist
+		 */
+		TXN_LOCK();
+
+		llid = ((struct linelock *) & tlck->lock)->next;
+		while (llid) {
+			linelock = (struct linelock *) lid_to_tlock(llid);
+			k = linelock->next;
+			txLockFree(llid);
+			llid = k;
+		}
+		txLockFree(lid);
+
+		TXN_UNLOCK();
+	}
+	tblk->next = tblk->last = 0;
+
+	/*
+	 * remove tblock from logsynclist
+	 * (allocation map pages inherited lsn of tblk and
+	 * has been inserted in logsync list at txUpdateMap())
+	 */
+	if (tblk->lsn) {
+		LOGSYNC_LOCK(log, flags);
+		log->count--;
+		list_del(&tblk->synclist);
+		LOGSYNC_UNLOCK(log, flags);
+	}
+}
+
+/*
+ *	txMaplock()
+ *
+ * function: allocate a transaction lock for freed page/entry;
+ *	for freed page, maplock is used as xtlock/dtlock type;
+ */
+struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
+{
+	struct jfs_inode_info *jfs_ip = JFS_IP(ip);
+	lid_t lid;
+	struct tblock *tblk;
+	struct tlock *tlck;
+	struct maplock *maplock;
+
+	TXN_LOCK();
+
+	/*
+	 * allocate a tlock
+	 */
+	lid = txLockAlloc();
+	tlck = lid_to_tlock(lid);
+
+	/*
+	 * initialize tlock
+	 */
+	tlck->tid = tid;
+
+	/* bind the tlock and the object */
+	tlck->flag = tlckINODELOCK;
+	if (S_ISDIR(ip->i_mode))
+		tlck->flag |= tlckDIRECTORY;
+	tlck->ip = ip;
+	tlck->mp = NULL;
+
+	tlck->type = type;
+
+	/*
+	 * enqueue transaction lock to transaction/inode
+	 */
+	/* insert the tlock at tail of transaction tlock list */
+	if (tid) {
+		tblk = tid_to_tblock(tid);
+		if (tblk->next)
+			lid_to_tlock(tblk->last)->next = lid;
+		else
+			tblk->next = lid;
+		tlck->next = 0;
+		tblk->last = lid;
+	}
+	/* anonymous transaction:
+	 * insert the tlock at head of inode anonymous tlock list
+	 */
+	else {
+		tlck->next = jfs_ip->atlhead;
+		jfs_ip->atlhead = lid;
+		if (tlck->next == 0) {
+			/* This inode's first anonymous transaction */
+			jfs_ip->atltail = lid;
+			list_add_tail(&jfs_ip->anon_inode_list,
+				      &TxAnchor.anon_list);
+		}
+	}
+
+	TXN_UNLOCK();
+
+	/* initialize type dependent area for maplock */
+	maplock = (struct maplock *) & tlck->lock;
+	maplock->next = 0;
+	maplock->maxcnt = 0;
+	maplock->index = 0;
+
+	return tlck;
+}
+
+/*
+ *	txLinelock()
+ *
+ * function: allocate a transaction lock for log vector list
+ */
+struct linelock *txLinelock(struct linelock * tlock)
+{
+	lid_t lid;
+	struct tlock *tlck;
+	struct linelock *linelock;
+
+	TXN_LOCK();
+
+	/* allocate a TxLock structure */
+	lid = txLockAlloc();
+	tlck = lid_to_tlock(lid);
+
+	TXN_UNLOCK();
+
+	/* initialize linelock */
+	linelock = (struct linelock *) tlck;
+	linelock->next = 0;
+	linelock->flag = tlckLINELOCK;
+	linelock->maxcnt = TLOCKLONG;
+	linelock->index = 0;
+	if (tlck->flag & tlckDIRECTORY)
+		linelock->flag |= tlckDIRECTORY;
+
+	/* append linelock after tlock */
+	linelock->next = tlock->next;
+	tlock->next = lid;
+
+	return linelock;
+}
+
+/*
+ *		transaction commit management
+ *		-----------------------------
+ */
+
+/*
+ * NAME:	txCommit()
+ *
+ * FUNCTION:	commit the changes to the objects specified in
+ *		clist.  For journalled segments only the
+ *		changes of the caller are committed, ie by tid.
+ *		for non-journalled segments the data are flushed to
+ *		disk and then the change to the disk inode and indirect
+ *		blocks committed (so blocks newly allocated to the
+ *		segment will be made a part of the segment atomically).
+ *
+ *		all of the segments specified in clist must be in
+ *		one file system. no more than 6 segments are needed
+ *		to handle all unix svcs.
+ *
+ *		if the i_nlink field (i.e. disk inode link count)
+ *		is zero, and the type of inode is a regular file or
+ *		directory, or symbolic link , the inode is truncated
+ *		to zero length. the truncation is committed but the
+ *		VM resources are unaffected until it is closed (see
+ *		iput and iclose).
+ *
+ * PARAMETER:
+ *
+ * RETURN:
+ *
+ * serialization:
+ *		on entry the inode lock on each segment is assumed
+ *		to be held.
+ *
+ * i/o error:
+ */
+int txCommit(tid_t tid,		/* transaction identifier */
+	     int nip,		/* number of inodes to commit */
+	     struct inode **iplist,	/* list of inode to commit */
+	     int flag)
+{
+	int rc = 0;
+	struct commit cd;
+	struct jfs_log *log;
+	struct tblock *tblk;
+	struct lrd *lrd;
+	struct inode *ip;
+	struct jfs_inode_info *jfs_ip;
+	int k, n;
+	ino_t top;
+	struct super_block *sb;
+
+	jfs_info("txCommit, tid = %d, flag = %d", tid, flag);
+	/* is read-only file system ? */
+	if (isReadOnly(iplist[0])) {
+		rc = -EROFS;
+		goto TheEnd;
+	}
+
+	sb = cd.sb = iplist[0]->i_sb;
+	cd.tid = tid;
+
+	if (tid == 0)
+		tid = txBegin(sb, 0);
+	tblk = tid_to_tblock(tid);
+
+	/*
+	 * initialize commit structure
+	 */
+	log = JFS_SBI(sb)->log;
+	cd.log = log;
+
+	/* initialize log record descriptor in commit */
+	lrd = &cd.lrd;
+	lrd->logtid = cpu_to_le32(tblk->logtid);
+	lrd->backchain = 0;
+
+	tblk->xflag |= flag;
+
+	if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0)
+		tblk->xflag |= COMMIT_LAZY;
+	/*
+	 *	prepare non-journaled objects for commit
+	 *
+	 * flush data pages of non-journaled file
+	 * to prevent the file getting non-initialized disk blocks
+	 * in case of crash.
+	 * (new blocks - )
+	 */
+	cd.iplist = iplist;
+	cd.nip = nip;
+
+	/*
+	 *	acquire transaction lock on (on-disk) inodes
+	 *
+	 * update on-disk inode from in-memory inode
+	 * acquiring transaction locks for AFTER records
+	 * on the on-disk inode of file object
+	 *
+	 * sort the inodes array by inode number in descending order
+	 * to prevent deadlock when acquiring transaction lock
+	 * of on-disk inodes on multiple on-disk inode pages by
+	 * multiple concurrent transactions
+	 */
+	for (k = 0; k < cd.nip; k++) {
+		top = (cd.iplist[k])->i_ino;
+		for (n = k + 1; n < cd.nip; n++) {
+			ip = cd.iplist[n];
+			if (ip->i_ino > top) {
+				top = ip->i_ino;
+				cd.iplist[n] = cd.iplist[k];
+				cd.iplist[k] = ip;
+			}
+		}
+
+		ip = cd.iplist[k];
+		jfs_ip = JFS_IP(ip);
+
+		/*
+		 * BUGBUG - This code has temporarily been removed.  The
+		 * intent is to ensure that any file data is written before
+		 * the metadata is committed to the journal.  This prevents
+		 * uninitialized data from appearing in a file after the
+		 * journal has been replayed.  (The uninitialized data
+		 * could be sensitive data removed by another user.)
+		 *
+		 * The problem now is that we are holding the IWRITELOCK
+		 * on the inode, and calling filemap_fdatawrite on an
+		 * unmapped page will cause a deadlock in jfs_get_block.
+		 *
+		 * The long term solution is to pare down the use of
+		 * IWRITELOCK.  We are currently holding it too long.
+		 * We could also be smarter about which data pages need
+		 * to be written before the transaction is committed and
+		 * when we don't need to worry about it at all.
+		 *
+		 * if ((!S_ISDIR(ip->i_mode))
+		 *    && (tblk->flag & COMMIT_DELETE) == 0)
+		 *	filemap_write_and_wait(ip->i_mapping);
+		 */
+
+		/*
+		 * Mark inode as not dirty.  It will still be on the dirty
+		 * inode list, but we'll know not to commit it again unless
+		 * it gets marked dirty again
+		 */
+		clear_cflag(COMMIT_Dirty, ip);
+
+		/* inherit anonymous tlock(s) of inode */
+		if (jfs_ip->atlhead) {
+			lid_to_tlock(jfs_ip->atltail)->next = tblk->next;
+			tblk->next = jfs_ip->atlhead;
+			if (!tblk->last)
+				tblk->last = jfs_ip->atltail;
+			jfs_ip->atlhead = jfs_ip->atltail = 0;
+			TXN_LOCK();
+			list_del_init(&jfs_ip->anon_inode_list);
+			TXN_UNLOCK();
+		}
+
+		/*
+		 * acquire transaction lock on on-disk inode page
+		 * (become first tlock of the tblk's tlock list)
+		 */
+		if (((rc = diWrite(tid, ip))))
+			goto out;
+	}
+
+	/*
+	 *	write log records from transaction locks
+	 *
+	 * txUpdateMap() resets XAD_NEW in XAD.
+	 */
+	if ((rc = txLog(log, tblk, &cd)))
+		goto TheEnd;
+
+	/*
+	 * Ensure that inode isn't reused before
+	 * lazy commit thread finishes processing
+	 */
+	if (tblk->xflag & COMMIT_DELETE) {
+		ihold(tblk->u.ip);
+		/*
+		 * Avoid a rare deadlock
+		 *
+		 * If the inode is locked, we may be blocked in
+		 * jfs_commit_inode.  If so, we don't want the
+		 * lazy_commit thread doing the last iput() on the inode
+		 * since that may block on the locked inode.  Instead,
+		 * commit the transaction synchronously, so the last iput
+		 * will be done by the calling thread (or later)
+		 */
+		/*
+		 * I believe this code is no longer needed.  Splitting I_LOCK
+		 * into two bits, I_NEW and I_SYNC should prevent this
+		 * deadlock as well.  But since I don't have a JFS testload
+		 * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
+		 * Joern
+		 */
+		if (tblk->u.ip->i_state & I_SYNC)
+			tblk->xflag &= ~COMMIT_LAZY;
+	}
+
+	ASSERT((!(tblk->xflag & COMMIT_DELETE)) ||
+	       ((tblk->u.ip->i_nlink == 0) &&
+		!test_cflag(COMMIT_Nolink, tblk->u.ip)));
+
+	/*
+	 *	write COMMIT log record
+	 */
+	lrd->type = cpu_to_le16(LOG_COMMIT);
+	lrd->length = 0;
+	lmLog(log, tblk, lrd, NULL);
+
+	lmGroupCommit(log, tblk);
+
+	/*
+	 *	- transaction is now committed -
+	 */
+
+	/*
+	 * force pages in careful update
+	 * (imap addressing structure update)
+	 */
+	if (flag & COMMIT_FORCE)
+		txForce(tblk);
+
+	/*
+	 *	update allocation map.
+	 *
+	 * update inode allocation map and inode:
+	 * free pager lock on memory object of inode if any.
+	 * update block allocation map.
+	 *
+	 * txUpdateMap() resets XAD_NEW in XAD.
+	 */
+	if (tblk->xflag & COMMIT_FORCE)
+		txUpdateMap(tblk);
+
+	/*
+	 *	free transaction locks and pageout/free pages
+	 */
+	txRelease(tblk);
+
+	if ((tblk->flag & tblkGC_LAZY) == 0)
+		txUnlock(tblk);
+
+
+	/*
+	 *	reset in-memory object state
+	 */
+	for (k = 0; k < cd.nip; k++) {
+		ip = cd.iplist[k];
+		jfs_ip = JFS_IP(ip);
+
+		/*
+		 * reset in-memory inode state
+		 */
+		jfs_ip->bxflag = 0;
+		jfs_ip->blid = 0;
+	}
+
+      out:
+	if (rc != 0)
+		txAbort(tid, 1);
+
+      TheEnd:
+	jfs_info("txCommit: tid = %d, returning %d", tid, rc);
+	return rc;
+}
+
+/*
+ * NAME:	txLog()
+ *
+ * FUNCTION:	Writes AFTER log records for all lines modified
+ *		by tid for segments specified by inodes in comdata.
+ *		Code assumes only WRITELOCKS are recorded in lockwords.
+ *
+ * PARAMETERS:
+ *
+ * RETURN :
+ */
+static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
+{
+	int rc = 0;
+	struct inode *ip;
+	lid_t lid;
+	struct tlock *tlck;
+	struct lrd *lrd = &cd->lrd;
+
+	/*
+	 * write log record(s) for each tlock of transaction,
+	 */
+	for (lid = tblk->next; lid; lid = tlck->next) {
+		tlck = lid_to_tlock(lid);
+
+		tlck->flag |= tlckLOG;
+
+		/* initialize lrd common */
+		ip = tlck->ip;
+		lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate);
+		lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset);
+		lrd->log.redopage.inode = cpu_to_le32(ip->i_ino);
+
+		/* write log record of page from the tlock */
+		switch (tlck->type & tlckTYPE) {
+		case tlckXTREE:
+			xtLog(log, tblk, lrd, tlck);
+			break;
+
+		case tlckDTREE:
+			dtLog(log, tblk, lrd, tlck);
+			break;
+
+		case tlckINODE:
+			diLog(log, tblk, lrd, tlck, cd);
+			break;
+
+		case tlckMAP:
+			mapLog(log, tblk, lrd, tlck);
+			break;
+
+		case tlckDATA:
+			dataLog(log, tblk, lrd, tlck);
+			break;
+
+		default:
+			jfs_err("UFO tlock:0x%p", tlck);
+		}
+	}
+
+	return rc;
+}
+
+/*
+ *	diLog()
+ *
+ * function:	log inode tlock and format maplock to update bmap;
+ */
+static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		 struct tlock * tlck, struct commit * cd)
+{
+	int rc = 0;
+	struct metapage *mp;
+	pxd_t *pxd;
+	struct pxd_lock *pxdlock;
+
+	mp = tlck->mp;
+
+	/* initialize as REDOPAGE record format */
+	lrd->log.redopage.type = cpu_to_le16(LOG_INODE);
+	lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE);
+
+	pxd = &lrd->log.redopage.pxd;
+
+	/*
+	 *	inode after image
+	 */
+	if (tlck->type & tlckENTRY) {
+		/* log after-image for logredo(): */
+		lrd->type = cpu_to_le16(LOG_REDOPAGE);
+		PXDaddress(pxd, mp->index);
+		PXDlength(pxd,
+			  mp->logical_size >> tblk->sb->s_blocksize_bits);
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+		/* mark page as homeward bound */
+		tlck->flag |= tlckWRITEPAGE;
+	} else if (tlck->type & tlckFREE) {
+		/*
+		 *	free inode extent
+		 *
+		 * (pages of the freed inode extent have been invalidated and
+		 * a maplock for free of the extent has been formatted at
+		 * txLock() time);
+		 *
+		 * the tlock had been acquired on the inode allocation map page
+		 * (iag) that specifies the freed extent, even though the map
+		 * page is not itself logged, to prevent pageout of the map
+		 * page before the log;
+		 */
+
+		/* log LOG_NOREDOINOEXT of the freed inode extent for
+		 * logredo() to start NoRedoPage filters, and to update
+		 * imap and bmap for free of the extent;
+		 */
+		lrd->type = cpu_to_le16(LOG_NOREDOINOEXT);
+		/*
+		 * For the LOG_NOREDOINOEXT record, we need
+		 * to pass the IAG number and inode extent
+		 * index (within that IAG) from which the
+		 * the extent being released.  These have been
+		 * passed to us in the iplist[1] and iplist[2].
+		 */
+		lrd->log.noredoinoext.iagnum =
+		    cpu_to_le32((u32) (size_t) cd->iplist[1]);
+		lrd->log.noredoinoext.inoext_idx =
+		    cpu_to_le32((u32) (size_t) cd->iplist[2]);
+
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		*pxd = pxdlock->pxd;
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+
+		/* update bmap */
+		tlck->flag |= tlckUPDATEMAP;
+
+		/* mark page as homeward bound */
+		tlck->flag |= tlckWRITEPAGE;
+	} else
+		jfs_err("diLog: UFO type tlck:0x%p", tlck);
+#ifdef  _JFS_WIP
+	/*
+	 *	alloc/free external EA extent
+	 *
+	 * a maplock for txUpdateMap() to update bPWMAP for alloc/free
+	 * of the extent has been formatted at txLock() time;
+	 */
+	else {
+		assert(tlck->type & tlckEA);
+
+		/* log LOG_UPDATEMAP for logredo() to update bmap for
+		 * alloc of new (and free of old) external EA extent;
+		 */
+		lrd->type = cpu_to_le16(LOG_UPDATEMAP);
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		nlock = pxdlock->index;
+		for (i = 0; i < nlock; i++, pxdlock++) {
+			if (pxdlock->flag & mlckALLOCPXD)
+				lrd->log.updatemap.type =
+				    cpu_to_le16(LOG_ALLOCPXD);
+			else
+				lrd->log.updatemap.type =
+				    cpu_to_le16(LOG_FREEPXD);
+			lrd->log.updatemap.nxd = cpu_to_le16(1);
+			lrd->log.updatemap.pxd = pxdlock->pxd;
+			lrd->backchain =
+			    cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+		}
+
+		/* update bmap */
+		tlck->flag |= tlckUPDATEMAP;
+	}
+#endif				/* _JFS_WIP */
+
+	return rc;
+}
+
+/*
+ *	dataLog()
+ *
+ * function:	log data tlock
+ */
+static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+	    struct tlock * tlck)
+{
+	struct metapage *mp;
+	pxd_t *pxd;
+
+	mp = tlck->mp;
+
+	/* initialize as REDOPAGE record format */
+	lrd->log.redopage.type = cpu_to_le16(LOG_DATA);
+	lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE);
+
+	pxd = &lrd->log.redopage.pxd;
+
+	/* log after-image for logredo(): */
+	lrd->type = cpu_to_le16(LOG_REDOPAGE);
+
+	if (jfs_dirtable_inline(tlck->ip)) {
+		/*
+		 * The table has been truncated, we've must have deleted
+		 * the last entry, so don't bother logging this
+		 */
+		mp->lid = 0;
+		grab_metapage(mp);
+		metapage_homeok(mp);
+		discard_metapage(mp);
+		tlck->mp = NULL;
+		return 0;
+	}
+
+	PXDaddress(pxd, mp->index);
+	PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits);
+
+	lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+	/* mark page as homeward bound */
+	tlck->flag |= tlckWRITEPAGE;
+
+	return 0;
+}
+
+/*
+ *	dtLog()
+ *
+ * function:	log dtree tlock and format maplock to update bmap;
+ */
+static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+	   struct tlock * tlck)
+{
+	struct metapage *mp;
+	struct pxd_lock *pxdlock;
+	pxd_t *pxd;
+
+	mp = tlck->mp;
+
+	/* initialize as REDOPAGE/NOREDOPAGE record format */
+	lrd->log.redopage.type = cpu_to_le16(LOG_DTREE);
+	lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE);
+
+	pxd = &lrd->log.redopage.pxd;
+
+	if (tlck->type & tlckBTROOT)
+		lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
+
+	/*
+	 *	page extension via relocation: entry insertion;
+	 *	page extension in-place: entry insertion;
+	 *	new right page from page split, reinitialized in-line
+	 *	root from root page split: entry insertion;
+	 */
+	if (tlck->type & (tlckNEW | tlckEXTEND)) {
+		/* log after-image of the new page for logredo():
+		 * mark log (LOG_NEW) for logredo() to initialize
+		 * freelist and update bmap for alloc of the new page;
+		 */
+		lrd->type = cpu_to_le16(LOG_REDOPAGE);
+		if (tlck->type & tlckEXTEND)
+			lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND);
+		else
+			lrd->log.redopage.type |= cpu_to_le16(LOG_NEW);
+		PXDaddress(pxd, mp->index);
+		PXDlength(pxd,
+			  mp->logical_size >> tblk->sb->s_blocksize_bits);
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+		/* format a maplock for txUpdateMap() to update bPMAP for
+		 * alloc of the new page;
+		 */
+		if (tlck->type & tlckBTROOT)
+			return;
+		tlck->flag |= tlckUPDATEMAP;
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		pxdlock->flag = mlckALLOCPXD;
+		pxdlock->pxd = *pxd;
+
+		pxdlock->index = 1;
+
+		/* mark page as homeward bound */
+		tlck->flag |= tlckWRITEPAGE;
+		return;
+	}
+
+	/*
+	 *	entry insertion/deletion,
+	 *	sibling page link update (old right page before split);
+	 */
+	if (tlck->type & (tlckENTRY | tlckRELINK)) {
+		/* log after-image for logredo(): */
+		lrd->type = cpu_to_le16(LOG_REDOPAGE);
+		PXDaddress(pxd, mp->index);
+		PXDlength(pxd,
+			  mp->logical_size >> tblk->sb->s_blocksize_bits);
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+		/* mark page as homeward bound */
+		tlck->flag |= tlckWRITEPAGE;
+		return;
+	}
+
+	/*
+	 *	page deletion: page has been invalidated
+	 *	page relocation: source extent
+	 *
+	 *	a maplock for free of the page has been formatted
+	 *	at txLock() time);
+	 */
+	if (tlck->type & (tlckFREE | tlckRELOCATE)) {
+		/* log LOG_NOREDOPAGE of the deleted page for logredo()
+		 * to start NoRedoPage filter and to update bmap for free
+		 * of the deletd page
+		 */
+		lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		*pxd = pxdlock->pxd;
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+
+		/* a maplock for txUpdateMap() for free of the page
+		 * has been formatted at txLock() time;
+		 */
+		tlck->flag |= tlckUPDATEMAP;
+	}
+	return;
+}
+
+/*
+ *	xtLog()
+ *
+ * function:	log xtree tlock and format maplock to update bmap;
+ */
+static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+	   struct tlock * tlck)
+{
+	struct inode *ip;
+	struct metapage *mp;
+	xtpage_t *p;
+	struct xtlock *xtlck;
+	struct maplock *maplock;
+	struct xdlistlock *xadlock;
+	struct pxd_lock *pxdlock;
+	pxd_t *page_pxd;
+	int next, lwm, hwm;
+
+	ip = tlck->ip;
+	mp = tlck->mp;
+
+	/* initialize as REDOPAGE/NOREDOPAGE record format */
+	lrd->log.redopage.type = cpu_to_le16(LOG_XTREE);
+	lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE);
+
+	page_pxd = &lrd->log.redopage.pxd;
+
+	if (tlck->type & tlckBTROOT) {
+		lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
+		p = &JFS_IP(ip)->i_xtroot;
+		if (S_ISDIR(ip->i_mode))
+			lrd->log.redopage.type |=
+			    cpu_to_le16(LOG_DIR_XTREE);
+	} else
+		p = (xtpage_t *) mp->data;
+	next = le16_to_cpu(p->header.nextindex);
+
+	xtlck = (struct xtlock *) & tlck->lock;
+
+	maplock = (struct maplock *) & tlck->lock;
+	xadlock = (struct xdlistlock *) maplock;
+
+	/*
+	 *	entry insertion/extension;
+	 *	sibling page link update (old right page before split);
+	 */
+	if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) {
+		/* log after-image for logredo():
+		 * logredo() will update bmap for alloc of new/extended
+		 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
+		 * after-image of XADlist;
+		 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
+		 * applying the after-image to the meta-data page.
+		 */
+		lrd->type = cpu_to_le16(LOG_REDOPAGE);
+		PXDaddress(page_pxd, mp->index);
+		PXDlength(page_pxd,
+			  mp->logical_size >> tblk->sb->s_blocksize_bits);
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+		/* format a maplock for txUpdateMap() to update bPMAP
+		 * for alloc of new/extended extents of XAD[lwm:next)
+		 * from the page itself;
+		 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
+		 */
+		lwm = xtlck->lwm.offset;
+		if (lwm == 0)
+			lwm = XTPAGEMAXSLOT;
+
+		if (lwm == next)
+			goto out;
+		if (lwm > next) {
+			jfs_err("xtLog: lwm > next");
+			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) {
+		pxd_t pxd;	/* truncated extent of xad */
+		int twm;
+
+		/*
+		 * For truncation the entire linelock may be used, so it would
+		 * be difficult to store xad list in linelock itself.
+		 * Therefore, we'll just force transaction to be committed
+		 * synchronously, so that xtree pages won't be changed before
+		 * txUpdateMap runs.
+		 */
+		tblk->xflag &= ~COMMIT_LAZY;
+		lwm = xtlck->lwm.offset;
+		if (lwm == 0)
+			lwm = XTPAGEMAXSLOT;
+		hwm = xtlck->hwm.offset;
+		twm = xtlck->twm.offset;
+
+		/*
+		 *	write log records
+		 */
+		/* log after-image for logredo():
+		 *
+		 * logredo() will update bmap for alloc of new/extended
+		 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
+		 * after-image of XADlist;
+		 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
+		 * applying the after-image to the meta-data page.
+		 */
+		lrd->type = cpu_to_le16(LOG_REDOPAGE);
+		PXDaddress(page_pxd, mp->index);
+		PXDlength(page_pxd,
+			  mp->logical_size >> tblk->sb->s_blocksize_bits);
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+
+		/*
+		 * truncate entry XAD[twm == next - 1]:
+		 */
+		if (twm == next - 1) {
+			/* init LOG_UPDATEMAP for logredo() to update bmap for
+			 * free of truncated delta extent of the truncated
+			 * entry XAD[next - 1]:
+			 * (xtlck->pxdlock = truncated delta extent);
+			 */
+			pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
+			/* assert(pxdlock->type & tlckTRUNCATE); */
+			lrd->type = cpu_to_le16(LOG_UPDATEMAP);
+			lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
+			lrd->log.updatemap.nxd = cpu_to_le16(1);
+			lrd->log.updatemap.pxd = pxdlock->pxd;
+			pxd = pxdlock->pxd;	/* save to format maplock */
+			lrd->backchain =
+			    cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+		}
+
+		/*
+		 * free entries XAD[next:hwm]:
+		 */
+		if (hwm >= next) {
+			/* init LOG_UPDATEMAP of the freed extents
+			 * XAD[next:hwm] from the deleted page itself
+			 * for logredo() to update bmap;
+			 */
+			lrd->type = cpu_to_le16(LOG_UPDATEMAP);
+			lrd->log.updatemap.type =
+			    cpu_to_le16(LOG_FREEXADLIST);
+			xtlck = (struct xtlock *) & tlck->lock;
+			hwm = xtlck->hwm.offset;
+			lrd->log.updatemap.nxd =
+			    cpu_to_le16(hwm - next + 1);
+			/* reformat linelock for lmLog() */
+			xtlck->header.offset = next;
+			xtlck->header.length = hwm - next + 1;
+			xtlck->index = 1;
+			lrd->backchain =
+			    cpu_to_le32(lmLog(log, tblk, lrd, tlck));
+		}
+
+		/*
+		 *	format maplock(s) for txUpdateMap() to update bmap
+		 */
+		maplock->index = 0;
+
+		/*
+		 * allocate entries XAD[lwm:next):
+		 */
+		if (lwm < next) {
+			/* format a maplock for txUpdateMap() to update bPMAP
+			 * for alloc of new/extended extents of XAD[lwm:next)
+			 * from the page itself;
+			 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
+			 */
+			tlck->flag |= tlckUPDATEMAP;
+			xadlock->flag = mlckALLOCXADLIST;
+			xadlock->count = next - lwm;
+			xadlock->xdlist = &p->xad[lwm];
+
+			jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d lwm:%d next:%d",
+				 tlck->ip, mp, xadlock->count, lwm, next);
+			maplock->index++;
+			xadlock++;
+		}
+
+		/*
+		 * truncate entry XAD[twm == next - 1]:
+		 */
+		if (twm == next - 1) {
+			/* format a maplock for txUpdateMap() to update bmap
+			 * to free truncated delta extent of the truncated
+			 * entry XAD[next - 1];
+			 * (xtlck->pxdlock = truncated delta extent);
+			 */
+			tlck->flag |= tlckUPDATEMAP;
+			pxdlock = (struct pxd_lock *) xadlock;
+			pxdlock->flag = mlckFREEPXD;
+			pxdlock->count = 1;
+			pxdlock->pxd = pxd;
+
+			jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d hwm:%d",
+				 ip, mp, pxdlock->count, hwm);
+			maplock->index++;
+			xadlock++;
+		}
+
+		/*
+		 * free entries XAD[next:hwm]:
+		 */
+		if (hwm >= next) {
+			/* format a maplock for txUpdateMap() to update bmap
+			 * to free extents of XAD[next:hwm] from thedeleted
+			 * page itself;
+			 */
+			tlck->flag |= tlckUPDATEMAP;
+			xadlock->flag = mlckFREEXADLIST;
+			xadlock->count = hwm - next + 1;
+			xadlock->xdlist = &p->xad[next];
+
+			jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d next:%d hwm:%d",
+				 tlck->ip, mp, xadlock->count, next, hwm);
+			maplock->index++;
+		}
+
+		/* mark page as homeward bound */
+		tlck->flag |= tlckWRITEPAGE;
+	}
+	return;
+}
+
+/*
+ *	mapLog()
+ *
+ * function:	log from maplock of freed data extents;
+ */
+static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
+		   struct tlock * tlck)
+{
+	struct pxd_lock *pxdlock;
+	int i, nlock;
+	pxd_t *pxd;
+
+	/*
+	 *	page relocation: free the source page extent
+	 *
+	 * a maplock for txUpdateMap() for free of the page
+	 * has been formatted at txLock() time saving the src
+	 * relocated page address;
+	 */
+	if (tlck->type & tlckRELOCATE) {
+		/* log LOG_NOREDOPAGE of the old relocated page
+		 * for logredo() to start NoRedoPage filter;
+		 */
+		lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		pxd = &lrd->log.redopage.pxd;
+		*pxd = pxdlock->pxd;
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+
+		/* (N.B. currently, logredo() does NOT update bmap
+		 * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
+		 * if page free from relocation, LOG_UPDATEMAP log is
+		 * specifically generated now for logredo()
+		 * to update bmap for free of src relocated page;
+		 * (new flag LOG_RELOCATE may be introduced which will
+		 * inform logredo() to start NORedoPage filter and also
+		 * update block allocation map at the same time, thus
+		 * avoiding an extra log write);
+		 */
+		lrd->type = cpu_to_le16(LOG_UPDATEMAP);
+		lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
+		lrd->log.updatemap.nxd = cpu_to_le16(1);
+		lrd->log.updatemap.pxd = pxdlock->pxd;
+		lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+
+		/* a maplock for txUpdateMap() for free of the page
+		 * has been formatted at txLock() time;
+		 */
+		tlck->flag |= tlckUPDATEMAP;
+		return;
+	}
+	/*
+
+	 * Otherwise it's not a relocate request
+	 *
+	 */
+	else {
+		/* log LOG_UPDATEMAP for logredo() to update bmap for
+		 * free of truncated/relocated delta extent of the data;
+		 * e.g.: external EA extent, relocated/truncated extent
+		 * from xtTailgate();
+		 */
+		lrd->type = cpu_to_le16(LOG_UPDATEMAP);
+		pxdlock = (struct pxd_lock *) & tlck->lock;
+		nlock = pxdlock->index;
+		for (i = 0; i < nlock; i++, pxdlock++) {
+			if (pxdlock->flag & mlckALLOCPXD)
+				lrd->log.updatemap.type =
+				    cpu_to_le16(LOG_ALLOCPXD);
+			else
+				lrd->log.updatemap.type =
+				    cpu_to_le16(LOG_FREEPXD);
+			lrd->log.updatemap.nxd = cpu_to_le16(1);
+			lrd->log.updatemap.pxd = pxdlock->pxd;
+			lrd->backchain =
+			    cpu_to_le32(lmLog(log, tblk, lrd, NULL));
+			jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
+				 (ulong) addressPXD(&pxdlock->pxd),
+				 lengthPXD(&pxdlock->pxd));
+		}
+
+		/* update bmap */
+		tlck->flag |= tlckUPDATEMAP;
+	}
+}
+
+/*
+ *	txEA()
+ *
+ * function:	acquire maplock for EA/ACL extents or
+ *		set COMMIT_INLINE flag;
+ */
+void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea)
+{
+	struct tlock *tlck = NULL;
+	struct pxd_lock *maplock = NULL, *pxdlock = NULL;
+
+	/*
+	 * format maplock for alloc of new EA extent
+	 */
+	if (newea) {
+		/* Since the newea could be a completely zeroed entry we need to
+		 * check for the two flags which indicate we should actually
+		 * commit new EA data
+		 */
+		if (newea->flag & DXD_EXTENT) {
+			tlck = txMaplock(tid, ip, tlckMAP);
+			maplock = (struct pxd_lock *) & tlck->lock;
+			pxdlock = (struct pxd_lock *) maplock;
+			pxdlock->flag = mlckALLOCPXD;
+			PXDaddress(&pxdlock->pxd, addressDXD(newea));
+			PXDlength(&pxdlock->pxd, lengthDXD(newea));
+			pxdlock++;
+			maplock->index = 1;
+		} else if (newea->flag & DXD_INLINE) {
+			tlck = NULL;
+
+			set_cflag(COMMIT_Inlineea, ip);
+		}
+	}
+
+	/*
+	 * format maplock for free of old EA extent
+	 */
+	if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) {
+		if (tlck == NULL) {
+			tlck = txMaplock(tid, ip, tlckMAP);
+			maplock = (struct pxd_lock *) & tlck->lock;
+			pxdlock = (struct pxd_lock *) maplock;
+			maplock->index = 0;
+		}
+		pxdlock->flag = mlckFREEPXD;
+		PXDaddress(&pxdlock->pxd, addressDXD(oldea));
+		PXDlength(&pxdlock->pxd, lengthDXD(oldea));
+		maplock->index++;
+	}
+}
+
+/*
+ *	txForce()
+ *
+ * function: synchronously write pages locked by transaction
+ *	     after txLog() but before txUpdateMap();
+ */
+static void txForce(struct tblock * tblk)
+{
+	struct tlock *tlck;
+	lid_t lid, next;
+	struct metapage *mp;
+
+	/*
+	 * reverse the order of transaction tlocks in
+	 * careful update order of address index pages
+	 * (right to left, bottom up)
+	 */
+	tlck = lid_to_tlock(tblk->next);
+	lid = tlck->next;
+	tlck->next = 0;
+	while (lid) {
+		tlck = lid_to_tlock(lid);
+		next = tlck->next;
+		tlck->next = tblk->next;
+		tblk->next = lid;
+		lid = next;
+	}
+
+	/*
+	 * synchronously write the page, and
+	 * hold the page for txUpdateMap();
+	 */
+	for (lid = tblk->next; lid; lid = next) {
+		tlck = lid_to_tlock(lid);
+		next = tlck->next;
+
+		if ((mp = tlck->mp) != NULL &&
+		    (tlck->type & tlckBTROOT) == 0) {
+			assert(mp->xflag & COMMIT_PAGE);
+
+			if (tlck->flag & tlckWRITEPAGE) {
+				tlck->flag &= ~tlckWRITEPAGE;
+
+				/* do not release page to freelist */
+				force_metapage(mp);
+#if 0
+				/*
+				 * The "right" thing to do here is to
+				 * synchronously write the metadata.
+				 * With the current implementation this
+				 * is hard since write_metapage requires
+				 * us to kunmap & remap the page.  If we
+				 * have tlocks pointing into the metadata
+				 * pages, we don't want to do this.  I think
+				 * we can get by with synchronously writing
+				 * the pages when they are released.
+				 */
+				assert(mp->nohomeok);
+				set_bit(META_dirty, &mp->flag);
+				set_bit(META_sync, &mp->flag);
+#endif
+			}
+		}
+	}
+}
+
+/*
+ *	txUpdateMap()
+ *
+ * function:	update persistent allocation map (and working map
+ *		if appropriate);
+ *
+ * parameter:
+ */
+static void txUpdateMap(struct tblock * tblk)
+{
+	struct inode *ip;
+	struct inode *ipimap;
+	lid_t lid;
+	struct tlock *tlck;
+	struct maplock *maplock;
+	struct pxd_lock pxdlock;
+	int maptype;
+	int k, nlock;
+	struct metapage *mp = NULL;
+
+	ipimap = JFS_SBI(tblk->sb)->ipimap;
+
+	maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP;
+
+
+	/*
+	 *	update block allocation map
+	 *
+	 * update allocation state in pmap (and wmap) and
+	 * update lsn of the pmap page;
+	 */
+	/*
+	 * scan each tlock/page of transaction for block allocation/free:
+	 *
+	 * for each tlock/page of transaction, update map.
+	 *  ? are there tlock for pmap and pwmap at the same time ?
+	 */
+	for (lid = tblk->next; lid; lid = tlck->next) {
+		tlck = lid_to_tlock(lid);
+
+		if ((tlck->flag & tlckUPDATEMAP) == 0)
+			continue;
+
+		if (tlck->flag & tlckFREEPAGE) {
+			/*
+			 * Another thread may attempt to reuse freed space
+			 * immediately, so we want to get rid of the metapage
+			 * before anyone else has a chance to get it.
+			 * Lock metapage, update maps, then invalidate
+			 * the metapage.
+			 */
+			mp = tlck->mp;
+			ASSERT(mp->xflag & COMMIT_PAGE);
+			grab_metapage(mp);
+		}
+
+		/*
+		 * extent list:
+		 * . in-line PXD list:
+		 * . out-of-line XAD list:
+		 */
+		maplock = (struct maplock *) & tlck->lock;
+		nlock = maplock->index;
+
+		for (k = 0; k < nlock; k++, maplock++) {
+			/*
+			 * allocate blocks in persistent map:
+			 *
+			 * blocks have been allocated from wmap at alloc time;
+			 */
+			if (maplock->flag & mlckALLOC) {
+				txAllocPMap(ipimap, maplock, tblk);
+			}
+			/*
+			 * free blocks in persistent and working map:
+			 * blocks will be freed in pmap and then in wmap;
+			 *
+			 * ? tblock specifies the PMAP/PWMAP based upon
+			 * transaction
+			 *
+			 * free blocks in persistent map:
+			 * blocks will be freed from wmap at last reference
+			 * release of the object for regular files;
+			 *
+			 * Alway free blocks from both persistent & working
+			 * maps for directories
+			 */
+			else {	/* (maplock->flag & mlckFREE) */
+
+				if (tlck->flag & tlckDIRECTORY)
+					txFreeMap(ipimap, maplock,
+						  tblk, COMMIT_PWMAP);
+				else
+					txFreeMap(ipimap, maplock,
+						  tblk, maptype);
+			}
+		}
+		if (tlck->flag & tlckFREEPAGE) {
+			if (!(tblk->flag & tblkGC_LAZY)) {
+				/* This is equivalent to txRelease */
+				ASSERT(mp->lid == lid);
+				tlck->mp->lid = 0;
+			}
+			assert(mp->nohomeok == 1);
+			metapage_homeok(mp);
+			discard_metapage(mp);
+			tlck->mp = NULL;
+		}
+	}
+	/*
+	 *	update inode allocation map
+	 *
+	 * update allocation state in pmap and
+	 * update lsn of the pmap page;
+	 * update in-memory inode flag/state
+	 *
+	 * unlock mapper/write lock
+	 */
+	if (tblk->xflag & COMMIT_CREATE) {
+		diUpdatePMap(ipimap, tblk->ino, false, tblk);
+		/* update persistent block allocation map
+		 * for the allocation of inode extent;
+		 */
+		pxdlock.flag = mlckALLOCPXD;
+		pxdlock.pxd = tblk->u.ixpxd;
+		pxdlock.index = 1;
+		txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk);
+	} else if (tblk->xflag & COMMIT_DELETE) {
+		ip = tblk->u.ip;
+		diUpdatePMap(ipimap, ip->i_ino, true, tblk);
+		iput(ip);
+	}
+}
+
+/*
+ *	txAllocPMap()
+ *
+ * function: allocate from persistent map;
+ *
+ * parameter:
+ *	ipbmap	-
+ *	malock	-
+ *		xad list:
+ *		pxd:
+ *
+ *	maptype -
+ *		allocate from persistent map;
+ *		free from persistent map;
+ *		(e.g., tmp file - free from working map at releae
+ *		 of last reference);
+ *		free from persistent and working map;
+ *
+ *	lsn	- log sequence number;
+ */
+static void txAllocPMap(struct inode *ip, struct maplock * maplock,
+			struct tblock * tblk)
+{
+	struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
+	struct xdlistlock *xadlistlock;
+	xad_t *xad;
+	s64 xaddr;
+	int xlen;
+	struct pxd_lock *pxdlock;
+	struct xdlistlock *pxdlistlock;
+	pxd_t *pxd;
+	int n;
+
+	/*
+	 * allocate from persistent map;
+	 */
+	if (maplock->flag & mlckALLOCXADLIST) {
+		xadlistlock = (struct xdlistlock *) maplock;
+		xad = xadlistlock->xdlist;
+		for (n = 0; n < xadlistlock->count; n++, xad++) {
+			if (xad->flag & (XAD_NEW | XAD_EXTENDED)) {
+				xaddr = addressXAD(xad);
+				xlen = lengthXAD(xad);
+				dbUpdatePMap(ipbmap, false, xaddr,
+					     (s64) xlen, tblk);
+				xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
+				jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
+					 (ulong) xaddr, xlen);
+			}
+		}
+	} else if (maplock->flag & mlckALLOCPXD) {
+		pxdlock = (struct pxd_lock *) maplock;
+		xaddr = addressPXD(&pxdlock->pxd);
+		xlen = lengthPXD(&pxdlock->pxd);
+		dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk);
+		jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen);
+	} else {		/* (maplock->flag & mlckALLOCPXDLIST) */
+
+		pxdlistlock = (struct xdlistlock *) maplock;
+		pxd = pxdlistlock->xdlist;
+		for (n = 0; n < pxdlistlock->count; n++, pxd++) {
+			xaddr = addressPXD(pxd);
+			xlen = lengthPXD(pxd);
+			dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen,
+				     tblk);
+			jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
+				 (ulong) xaddr, xlen);
+		}
+	}
+}
+
+/*
+ *	txFreeMap()
+ *
+ * function:	free from persistent and/or working map;
+ *
+ * todo: optimization
+ */
+void txFreeMap(struct inode *ip,
+	       struct maplock * maplock, struct tblock * tblk, int maptype)
+{
+	struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
+	struct xdlistlock *xadlistlock;
+	xad_t *xad;
+	s64 xaddr;
+	int xlen;
+	struct pxd_lock *pxdlock;
+	struct xdlistlock *pxdlistlock;
+	pxd_t *pxd;
+	int n;
+
+	jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
+		 tblk, maplock, maptype);
+
+	/*
+	 * free from persistent map;
+	 */
+	if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) {
+		if (maplock->flag & mlckFREEXADLIST) {
+			xadlistlock = (struct xdlistlock *) maplock;
+			xad = xadlistlock->xdlist;
+			for (n = 0; n < xadlistlock->count; n++, xad++) {
+				if (!(xad->flag & XAD_NEW)) {
+					xaddr = addressXAD(xad);
+					xlen = lengthXAD(xad);
+					dbUpdatePMap(ipbmap, true, xaddr,
+						     (s64) xlen, tblk);
+					jfs_info("freePMap: xaddr:0x%lx xlen:%d",
+						 (ulong) xaddr, xlen);
+				}
+			}
+		} else if (maplock->flag & mlckFREEPXD) {
+			pxdlock = (struct pxd_lock *) maplock;
+			xaddr = addressPXD(&pxdlock->pxd);
+			xlen = lengthPXD(&pxdlock->pxd);
+			dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen,
+				     tblk);
+			jfs_info("freePMap: xaddr:0x%lx xlen:%d",
+				 (ulong) xaddr, xlen);
+		} else {	/* (maplock->flag & mlckALLOCPXDLIST) */
+
+			pxdlistlock = (struct xdlistlock *) maplock;
+			pxd = pxdlistlock->xdlist;
+			for (n = 0; n < pxdlistlock->count; n++, pxd++) {
+				xaddr = addressPXD(pxd);
+				xlen = lengthPXD(pxd);
+				dbUpdatePMap(ipbmap, true, xaddr,
+					     (s64) xlen, tblk);
+				jfs_info("freePMap: xaddr:0x%lx xlen:%d",
+					 (ulong) xaddr, xlen);
+			}
+		}
+	}
+
+	/*
+	 * free from working map;
+	 */
+	if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) {
+		if (maplock->flag & mlckFREEXADLIST) {
+			xadlistlock = (struct xdlistlock *) maplock;
+			xad = xadlistlock->xdlist;
+			for (n = 0; n < xadlistlock->count; n++, xad++) {
+				xaddr = addressXAD(xad);
+				xlen = lengthXAD(xad);
+				dbFree(ip, xaddr, (s64) xlen);
+				xad->flag = 0;
+				jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
+					 (ulong) xaddr, xlen);
+			}
+		} else if (maplock->flag & mlckFREEPXD) {
+			pxdlock = (struct pxd_lock *) maplock;
+			xaddr = addressPXD(&pxdlock->pxd);
+			xlen = lengthPXD(&pxdlock->pxd);
+			dbFree(ip, xaddr, (s64) xlen);
+			jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
+				 (ulong) xaddr, xlen);
+		} else {	/* (maplock->flag & mlckFREEPXDLIST) */
+
+			pxdlistlock = (struct xdlistlock *) maplock;
+			pxd = pxdlistlock->xdlist;
+			for (n = 0; n < pxdlistlock->count; n++, pxd++) {
+				xaddr = addressPXD(pxd);
+				xlen = lengthPXD(pxd);
+				dbFree(ip, xaddr, (s64) xlen);
+				jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
+					 (ulong) xaddr, xlen);
+			}
+		}
+	}
+}
+
+/*
+ *	txFreelock()
+ *
+ * function:	remove tlock from inode anonymous locklist
+ */
+void txFreelock(struct inode *ip)
+{
+	struct jfs_inode_info *jfs_ip = JFS_IP(ip);
+	struct tlock *xtlck, *tlck;
+	lid_t xlid = 0, lid;
+
+	if (!jfs_ip->atlhead)
+		return;
+
+	TXN_LOCK();
+	xtlck = (struct tlock *) &jfs_ip->atlhead;
+
+	while ((lid = xtlck->next) != 0) {
+		tlck = lid_to_tlock(lid);
+		if (tlck->flag & tlckFREELOCK) {
+			xtlck->next = tlck->next;
+			txLockFree(lid);
+		} else {
+			xtlck = tlck;
+			xlid = lid;
+		}
+	}
+
+	if (jfs_ip->atlhead)
+		jfs_ip->atltail = xlid;
+	else {
+		jfs_ip->atltail = 0;
+		/*
+		 * If inode was on anon_list, remove it
+		 */
+		list_del_init(&jfs_ip->anon_inode_list);
+	}
+	TXN_UNLOCK();
+}
+
+/*
+ *	txAbort()
+ *
+ * function: abort tx before commit;
+ *
+ * frees line-locks and segment locks for all
+ * segments in comdata structure.
+ * Optionally sets state of file-system to FM_DIRTY in super-block.
+ * log age of page-frames in memory for which caller has
+ * are reset to 0 (to avoid logwarap).
+ */
+void txAbort(tid_t tid, int dirty)
+{
+	lid_t lid, next;
+	struct metapage *mp;
+	struct tblock *tblk = tid_to_tblock(tid);
+	struct tlock *tlck;
+
+	/*
+	 * free tlocks of the transaction
+	 */
+	for (lid = tblk->next; lid; lid = next) {
+		tlck = lid_to_tlock(lid);
+		next = tlck->next;
+		mp = tlck->mp;
+		JFS_IP(tlck->ip)->xtlid = 0;
+
+		if (mp) {
+			mp->lid = 0;
+
+			/*
+			 * reset lsn of page to avoid logwarap:
+			 *
+			 * (page may have been previously committed by another
+			 * transaction(s) but has not been paged, i.e.,
+			 * it may be on logsync list even though it has not
+			 * been logged for the current tx.)
+			 */
+			if (mp->xflag & COMMIT_PAGE && mp->lsn)
+				LogSyncRelease(mp);
+		}
+		/* insert tlock at head of freelist */
+		TXN_LOCK();
+		txLockFree(lid);
+		TXN_UNLOCK();
+	}
+
+	/* caller will free the transaction block */
+
+	tblk->next = tblk->last = 0;
+
+	/*
+	 * mark filesystem dirty
+	 */
+	if (dirty)
+		jfs_error(tblk->sb, "\n");
+
+	return;
+}
+
+/*
+ *	txLazyCommit(void)
+ *
+ *	All transactions except those changing ipimap (COMMIT_FORCE) are
+ *	processed by this routine.  This insures that the inode and block
+ *	allocation maps are updated in order.  For synchronous transactions,
+ *	let the user thread finish processing after txUpdateMap() is called.
+ */
+static void txLazyCommit(struct tblock * tblk)
+{
+	struct jfs_log *log;
+
+	while (((tblk->flag & tblkGC_READY) == 0) &&
+	       ((tblk->flag & tblkGC_UNLOCKED) == 0)) {
+		/* We must have gotten ahead of the user thread
+		 */
+		jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk);
+		yield();
+	}
+
+	jfs_info("txLazyCommit: processing tblk 0x%p", tblk);
+
+	txUpdateMap(tblk);
+
+	log = (struct jfs_log *) JFS_SBI(tblk->sb)->log;
+
+	spin_lock_irq(&log->gclock);	// LOGGC_LOCK
+
+	tblk->flag |= tblkGC_COMMITTED;
+
+	if (tblk->flag & tblkGC_READY)
+		log->gcrtc--;
+
+	wake_up_all(&tblk->gcwait);	// LOGGC_WAKEUP
+
+	/*
+	 * Can't release log->gclock until we've tested tblk->flag
+	 */
+	if (tblk->flag & tblkGC_LAZY) {
+		spin_unlock_irq(&log->gclock);	// LOGGC_UNLOCK
+		txUnlock(tblk);
+		tblk->flag &= ~tblkGC_LAZY;
+		txEnd(tblk - TxBlock);	/* Convert back to tid */
+	} else
+		spin_unlock_irq(&log->gclock);	// LOGGC_UNLOCK
+
+	jfs_info("txLazyCommit: done: tblk = 0x%p", tblk);
+}
+
+/*
+ *	jfs_lazycommit(void)
+ *
+ *	To be run as a kernel daemon.  If lbmIODone is called in an interrupt
+ *	context, or where blocking is not wanted, this routine will process
+ *	committed transactions from the unlock queue.
+ */
+int jfs_lazycommit(void *arg)
+{
+	int WorkDone;
+	struct tblock *tblk;
+	unsigned long flags;
+	struct jfs_sb_info *sbi;
+
+	do {
+		LAZY_LOCK(flags);
+		jfs_commit_thread_waking = 0;	/* OK to wake another thread */
+		while (!list_empty(&TxAnchor.unlock_queue)) {
+			WorkDone = 0;
+			list_for_each_entry(tblk, &TxAnchor.unlock_queue,
+					    cqueue) {
+
+				sbi = JFS_SBI(tblk->sb);
+				/*
+				 * For each volume, the transactions must be
+				 * handled in order.  If another commit thread
+				 * is handling a tblk for this superblock,
+				 * skip it
+				 */
+				if (sbi->commit_state & IN_LAZYCOMMIT)
+					continue;
+
+				sbi->commit_state |= IN_LAZYCOMMIT;
+				WorkDone = 1;
+
+				/*
+				 * Remove transaction from queue
+				 */
+				list_del(&tblk->cqueue);
+
+				LAZY_UNLOCK(flags);
+				txLazyCommit(tblk);
+				LAZY_LOCK(flags);
+
+				sbi->commit_state &= ~IN_LAZYCOMMIT;
+				/*
+				 * Don't continue in the for loop.  (We can't
+				 * anyway, it's unsafe!)  We want to go back to
+				 * the beginning of the list.
+				 */
+				break;
+			}
+
+			/* If there was nothing to do, don't continue */
+			if (!WorkDone)
+				break;
+		}
+		/* In case a wakeup came while all threads were active */
+		jfs_commit_thread_waking = 0;
+
+		if (freezing(current)) {
+			LAZY_UNLOCK(flags);
+			try_to_freeze();
+		} else {
+			DECLARE_WAITQUEUE(wq, current);
+
+			add_wait_queue(&jfs_commit_thread_wait, &wq);
+			set_current_state(TASK_INTERRUPTIBLE);
+			LAZY_UNLOCK(flags);
+			schedule();
+			remove_wait_queue(&jfs_commit_thread_wait, &wq);
+		}
+	} while (!kthread_should_stop());
+
+	if (!list_empty(&TxAnchor.unlock_queue))
+		jfs_err("jfs_lazycommit being killed w/pending transactions!");
+	else
+		jfs_info("jfs_lazycommit being killed");
+	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_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
+		goto restart;
+	}
+	TXN_UNLOCK();
+
+	/*
+	 * We may need to kick off the group commit
+	 */
+	jfs_flush_journal(log, 0);
+}
+
+/*
+ * txResume()
+ *
+ * Allows transactions to start again following txQuiesce
+ */
+void txResume(struct super_block *sb)
+{
+	struct jfs_log *log = JFS_SBI(sb)->log;
+
+	clear_bit(log_QUIESCE, &log->flag);
+	TXN_WAKEUP(&log->syncwait);
+}
+
+/*
+ *	jfs_sync(void)
+ *
+ *	To be run as a kernel daemon.  This is awakened when tlocks run low.
+ *	We write any inodes that have anonymous tlocks so they will become
+ *	available.
+ */
+int jfs_sync(void *arg)
+{
+	struct inode *ip;
+	struct jfs_inode_info *jfs_ip;
+	tid_t tid;
+
+	do {
+		/*
+		 * write each inode on the anonymous inode list
+		 */
+		TXN_LOCK();
+		while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) {
+			jfs_ip = list_entry(TxAnchor.anon_list.next,
+					    struct jfs_inode_info,
+					    anon_inode_list);
+			ip = &jfs_ip->vfs_inode;
+
+			if (! igrab(ip)) {
+				/*
+				 * Inode is being freed
+				 */
+				list_del_init(&jfs_ip->anon_inode_list);
+			} else if (mutex_trylock(&jfs_ip->commit_mutex)) {
+				/*
+				 * inode will be removed from anonymous list
+				 * when it is committed
+				 */
+				TXN_UNLOCK();
+				tid = txBegin(ip->i_sb, COMMIT_INODE);
+				txCommit(tid, 1, &ip, 0);
+				txEnd(tid);
+				mutex_unlock(&jfs_ip->commit_mutex);
+
+				iput(ip);
+				/*
+				 * Just to be safe.  I don't know how
+				 * long we can run without blocking
+				 */
+				cond_resched();
+				TXN_LOCK();
+			} else {
+				/* We can't get the commit mutex.  It may
+				 * be held by a thread waiting for tlock's
+				 * so let's not block here.  Save it to
+				 * put back on the anon_list.
+				 */
+
+				/* Move from anon_list to anon_list2 */
+				list_move(&jfs_ip->anon_inode_list,
+					  &TxAnchor.anon_list2);
+
+				TXN_UNLOCK();
+				iput(ip);
+				TXN_LOCK();
+			}
+		}
+		/* Add anon_list2 back to anon_list */
+		list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
+
+		if (freezing(current)) {
+			TXN_UNLOCK();
+			try_to_freeze();
+		} else {
+			set_current_state(TASK_INTERRUPTIBLE);
+			TXN_UNLOCK();
+			schedule();
+		}
+	} while (!kthread_should_stop());
+
+	jfs_info("jfs_sync being killed");
+	return 0;
+}
+
+#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
+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;
+}
+#endif
+
+#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
+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;
+}
+#endif