1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) International Business Machines Corp., 2000-2005
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
8 * jfs_txnmgr.c: transaction manager
11 * transaction starts with txBegin() and ends with txCommit()
14 * tlock is acquired at the time of update;
15 * (obviate scan at commit time for xtree and dtree)
16 * tlock and mp points to each other;
17 * (no hashlist for mp -> tlock).
20 * tlock on in-memory inode:
21 * in-place tlock in the in-memory inode itself;
22 * converted to page lock by iWrite() at commit time.
24 * tlock during write()/mmap() under anonymous transaction (tid = 0):
25 * transferred (?) to transaction at commit time.
27 * use the page itself to update allocation maps
28 * (obviate intermediate replication of allocation/deallocation data)
29 * hold on to mp+lock thru update of maps
33 #include <linux/vmalloc.h>
34 #include <linux/completion.h>
35 #include <linux/freezer.h>
36 #include <linux/module.h>
37 #include <linux/moduleparam.h>
38 #include <linux/kthread.h>
39 #include <linux/seq_file.h>
40 #include "jfs_incore.h"
41 #include "jfs_inode.h"
42 #include "jfs_filsys.h"
43 #include "jfs_metapage.h"
44 #include "jfs_dinode.h"
47 #include "jfs_superblock.h"
48 #include "jfs_debug.h"
51 * transaction management structures
54 int freetid
; /* index of a free tid structure */
55 int freelock
; /* index first free lock word */
56 wait_queue_head_t freewait
; /* eventlist of free tblock */
57 wait_queue_head_t freelockwait
; /* eventlist of free tlock */
58 wait_queue_head_t lowlockwait
; /* eventlist of ample tlocks */
59 int tlocksInUse
; /* Number of tlocks in use */
60 spinlock_t LazyLock
; /* synchronize sync_queue & unlock_queue */
61 /* struct tblock *sync_queue; * Transactions waiting for data sync */
62 struct list_head unlock_queue
; /* Txns waiting to be released */
63 struct list_head anon_list
; /* inodes having anonymous txns */
64 struct list_head anon_list2
; /* inodes having anonymous txns
65 that couldn't be sync'ed */
68 int jfs_tlocks_low
; /* Indicates low number of available tlocks */
70 #ifdef CONFIG_JFS_STATISTICS
74 uint txBegin_lockslow
;
77 uint txBeginAnon_barrier
;
78 uint txBeginAnon_lockslow
;
80 uint txLockAlloc_freelock
;
84 static int nTxBlock
= -1; /* number of transaction blocks */
85 module_param(nTxBlock
, int, 0);
86 MODULE_PARM_DESC(nTxBlock
,
87 "Number of transaction blocks (max:65536)");
89 static int nTxLock
= -1; /* number of transaction locks */
90 module_param(nTxLock
, int, 0);
91 MODULE_PARM_DESC(nTxLock
,
92 "Number of transaction locks (max:65536)");
94 struct tblock
*TxBlock
; /* transaction block table */
95 static int TxLockLWM
; /* Low water mark for number of txLocks used */
96 static int TxLockHWM
; /* High water mark for number of txLocks used */
97 static int TxLockVHWM
; /* Very High water mark */
98 struct tlock
*TxLock
; /* transaction lock table */
101 * transaction management lock
103 static DEFINE_SPINLOCK(jfsTxnLock
);
105 #define TXN_LOCK() spin_lock(&jfsTxnLock)
106 #define TXN_UNLOCK() spin_unlock(&jfsTxnLock)
108 #define LAZY_LOCK_INIT() spin_lock_init(&TxAnchor.LazyLock)
109 #define LAZY_LOCK(flags) spin_lock_irqsave(&TxAnchor.LazyLock, flags)
110 #define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
112 static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait
);
113 static int jfs_commit_thread_waking
;
116 * Retry logic exist outside these macros to protect from spurrious wakeups.
118 static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t
* event
)
120 DECLARE_WAITQUEUE(wait
, current
);
122 add_wait_queue(event
, &wait
);
123 set_current_state(TASK_UNINTERRUPTIBLE
);
126 remove_wait_queue(event
, &wait
);
129 #define TXN_SLEEP(event)\
131 TXN_SLEEP_DROP_LOCK(event);\
135 #define TXN_WAKEUP(event) wake_up_all(event)
141 tid_t maxtid
; /* 4: biggest tid ever used */
142 lid_t maxlid
; /* 4: biggest lid ever used */
143 int ntid
; /* 4: # of transactions performed */
144 int nlid
; /* 4: # of tlocks acquired */
145 int waitlock
; /* 4: # of tlock wait */
151 static void diLog(struct jfs_log
*log
, struct tblock
*tblk
, struct lrd
*lrd
,
152 struct tlock
*tlck
, struct commit
*cd
);
153 static void dataLog(struct jfs_log
*log
, struct tblock
*tblk
, struct lrd
*lrd
,
155 static void dtLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
156 struct tlock
* tlck
);
157 static void mapLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
158 struct tlock
* tlck
);
159 static void txAllocPMap(struct inode
*ip
, struct maplock
* maplock
,
160 struct tblock
* tblk
);
161 static void txForce(struct tblock
* tblk
);
162 static void txLog(struct jfs_log
*log
, struct tblock
*tblk
,
164 static void txUpdateMap(struct tblock
* tblk
);
165 static void txRelease(struct tblock
* tblk
);
166 static void xtLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
167 struct tlock
* tlck
);
168 static void LogSyncRelease(struct metapage
* mp
);
171 * transaction block/lock management
172 * ---------------------------------
176 * Get a transaction lock from the free list. If the number in use is
177 * greater than the high water mark, wake up the sync daemon. This should
178 * free some anonymous transaction locks. (TXN_LOCK must be held.)
180 static lid_t
txLockAlloc(void)
184 INCREMENT(TxStat
.txLockAlloc
);
185 if (!TxAnchor
.freelock
) {
186 INCREMENT(TxStat
.txLockAlloc_freelock
);
189 while (!(lid
= TxAnchor
.freelock
))
190 TXN_SLEEP(&TxAnchor
.freelockwait
);
191 TxAnchor
.freelock
= TxLock
[lid
].next
;
192 HIGHWATERMARK(stattx
.maxlid
, lid
);
193 if ((++TxAnchor
.tlocksInUse
> TxLockHWM
) && (jfs_tlocks_low
== 0)) {
194 jfs_info("txLockAlloc tlocks low");
196 wake_up_process(jfsSyncThread
);
202 static void txLockFree(lid_t lid
)
205 TxLock
[lid
].next
= TxAnchor
.freelock
;
206 TxAnchor
.freelock
= lid
;
207 TxAnchor
.tlocksInUse
--;
208 if (jfs_tlocks_low
&& (TxAnchor
.tlocksInUse
< TxLockLWM
)) {
209 jfs_info("txLockFree jfs_tlocks_low no more");
211 TXN_WAKEUP(&TxAnchor
.lowlockwait
);
213 TXN_WAKEUP(&TxAnchor
.freelockwait
);
219 * FUNCTION: initialize transaction management structures
223 * serialization: single thread at jfs_init()
230 /* Set defaults for nTxLock and nTxBlock if unset */
233 if (nTxBlock
== -1) {
234 /* Base default on memory size */
236 if (si
.totalram
> (256 * 1024)) /* 1 GB */
239 nTxLock
= si
.totalram
>> 2;
240 } else if (nTxBlock
> (8 * 1024))
243 nTxLock
= nTxBlock
<< 3;
246 nTxBlock
= nTxLock
>> 3;
248 /* Verify tunable parameters */
250 nTxBlock
= 16; /* No one should set it this low */
251 if (nTxBlock
> 65536)
254 nTxLock
= 256; /* No one should set it this low */
258 printk(KERN_INFO
"JFS: nTxBlock = %d, nTxLock = %d\n",
261 * initialize transaction block (tblock) table
263 * transaction id (tid) = tblock index
264 * tid = 0 is reserved.
266 TxLockLWM
= (nTxLock
* 4) / 10;
267 TxLockHWM
= (nTxLock
* 7) / 10;
268 TxLockVHWM
= (nTxLock
* 8) / 10;
270 size
= sizeof(struct tblock
) * nTxBlock
;
271 TxBlock
= vmalloc(size
);
275 for (k
= 1; k
< nTxBlock
- 1; k
++) {
276 TxBlock
[k
].next
= k
+ 1;
277 init_waitqueue_head(&TxBlock
[k
].gcwait
);
278 init_waitqueue_head(&TxBlock
[k
].waitor
);
281 init_waitqueue_head(&TxBlock
[k
].gcwait
);
282 init_waitqueue_head(&TxBlock
[k
].waitor
);
284 TxAnchor
.freetid
= 1;
285 init_waitqueue_head(&TxAnchor
.freewait
);
287 stattx
.maxtid
= 1; /* statistics */
290 * initialize transaction lock (tlock) table
292 * transaction lock id = tlock index
293 * tlock id = 0 is reserved.
295 size
= sizeof(struct tlock
) * nTxLock
;
296 TxLock
= vmalloc(size
);
297 if (TxLock
== NULL
) {
302 /* initialize tlock table */
303 for (k
= 1; k
< nTxLock
- 1; k
++)
304 TxLock
[k
].next
= k
+ 1;
306 init_waitqueue_head(&TxAnchor
.freelockwait
);
307 init_waitqueue_head(&TxAnchor
.lowlockwait
);
309 TxAnchor
.freelock
= 1;
310 TxAnchor
.tlocksInUse
= 0;
311 INIT_LIST_HEAD(&TxAnchor
.anon_list
);
312 INIT_LIST_HEAD(&TxAnchor
.anon_list2
);
315 INIT_LIST_HEAD(&TxAnchor
.unlock_queue
);
317 stattx
.maxlid
= 1; /* statistics */
325 * FUNCTION: clean up when module is unloaded
338 * FUNCTION: start a transaction.
340 * PARAMETER: sb - superblock
341 * flag - force for nested tx;
343 * RETURN: tid - transaction id
345 * note: flag force allows to start tx for nested tx
346 * to prevent deadlock on logsync barrier;
348 tid_t
txBegin(struct super_block
*sb
, int flag
)
354 jfs_info("txBegin: flag = 0x%x", flag
);
355 log
= JFS_SBI(sb
)->log
;
359 INCREMENT(TxStat
.txBegin
);
362 if (!(flag
& COMMIT_FORCE
)) {
364 * synchronize with logsync barrier
366 if (test_bit(log_SYNCBARRIER
, &log
->flag
) ||
367 test_bit(log_QUIESCE
, &log
->flag
)) {
368 INCREMENT(TxStat
.txBegin_barrier
);
369 TXN_SLEEP(&log
->syncwait
);
375 * Don't begin transaction if we're getting starved for tlocks
376 * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
379 if (TxAnchor
.tlocksInUse
> TxLockVHWM
) {
380 INCREMENT(TxStat
.txBegin_lockslow
);
381 TXN_SLEEP(&TxAnchor
.lowlockwait
);
387 * allocate transaction id/block
389 if ((t
= TxAnchor
.freetid
) == 0) {
390 jfs_info("txBegin: waiting for free tid");
391 INCREMENT(TxStat
.txBegin_freetid
);
392 TXN_SLEEP(&TxAnchor
.freewait
);
396 tblk
= tid_to_tblock(t
);
398 if ((tblk
->next
== 0) && !(flag
& COMMIT_FORCE
)) {
399 /* Don't let a non-forced transaction take the last tblk */
400 jfs_info("txBegin: waiting for free tid");
401 INCREMENT(TxStat
.txBegin_freetid
);
402 TXN_SLEEP(&TxAnchor
.freewait
);
406 TxAnchor
.freetid
= tblk
->next
;
409 * initialize transaction
413 * We can't zero the whole thing or we screw up another thread being
414 * awakened after sleeping on tblk->waitor
416 * memset(tblk, 0, sizeof(struct tblock));
418 tblk
->next
= tblk
->last
= tblk
->xflag
= tblk
->flag
= tblk
->lsn
= 0;
422 tblk
->logtid
= log
->logtid
;
426 HIGHWATERMARK(stattx
.maxtid
, t
); /* statistics */
427 INCREMENT(stattx
.ntid
); /* statistics */
431 jfs_info("txBegin: returning tid = %d", t
);
437 * NAME: txBeginAnon()
439 * FUNCTION: start an anonymous transaction.
440 * Blocks if logsync or available tlocks are low to prevent
441 * anonymous tlocks from depleting supply.
443 * PARAMETER: sb - superblock
447 void txBeginAnon(struct super_block
*sb
)
451 log
= JFS_SBI(sb
)->log
;
454 INCREMENT(TxStat
.txBeginAnon
);
458 * synchronize with logsync barrier
460 if (test_bit(log_SYNCBARRIER
, &log
->flag
) ||
461 test_bit(log_QUIESCE
, &log
->flag
)) {
462 INCREMENT(TxStat
.txBeginAnon_barrier
);
463 TXN_SLEEP(&log
->syncwait
);
468 * Don't begin transaction if we're getting starved for tlocks
470 if (TxAnchor
.tlocksInUse
> TxLockVHWM
) {
471 INCREMENT(TxStat
.txBeginAnon_lockslow
);
472 TXN_SLEEP(&TxAnchor
.lowlockwait
);
481 * function: free specified transaction block.
483 * logsync barrier processing:
487 void txEnd(tid_t tid
)
489 struct tblock
*tblk
= tid_to_tblock(tid
);
492 jfs_info("txEnd: tid = %d", tid
);
496 * wakeup transactions waiting on the page locked
497 * by the current transaction
499 TXN_WAKEUP(&tblk
->waitor
);
501 log
= JFS_SBI(tblk
->sb
)->log
;
504 * Lazy commit thread can't free this guy until we mark it UNLOCKED,
505 * otherwise, we would be left with a transaction that may have been
508 * Lazy commit thread will turn off tblkGC_LAZY before calling this
511 if (tblk
->flag
& tblkGC_LAZY
) {
512 jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid
, tblk
);
515 spin_lock_irq(&log
->gclock
); // LOGGC_LOCK
516 tblk
->flag
|= tblkGC_UNLOCKED
;
517 spin_unlock_irq(&log
->gclock
); // LOGGC_UNLOCK
521 jfs_info("txEnd: tid: %d, tblk = 0x%p", tid
, tblk
);
523 assert(tblk
->next
== 0);
526 * insert tblock back on freelist
528 tblk
->next
= TxAnchor
.freetid
;
529 TxAnchor
.freetid
= tid
;
532 * mark the tblock not active
534 if (--log
->active
== 0) {
535 clear_bit(log_FLUSH
, &log
->flag
);
538 * synchronize with logsync barrier
540 if (test_bit(log_SYNCBARRIER
, &log
->flag
)) {
543 /* write dirty metadata & forward log syncpt */
546 jfs_info("log barrier off: 0x%x", log
->lsn
);
548 /* enable new transactions start */
549 clear_bit(log_SYNCBARRIER
, &log
->flag
);
551 /* wakeup all waitors for logsync barrier */
552 TXN_WAKEUP(&log
->syncwait
);
561 * wakeup all waitors for a free tblock
563 TXN_WAKEUP(&TxAnchor
.freewait
);
569 * function: acquire a transaction lock on the specified <mp>
573 * return: transaction lock id
577 struct tlock
*txLock(tid_t tid
, struct inode
*ip
, struct metapage
* mp
,
580 struct jfs_inode_info
*jfs_ip
= JFS_IP(ip
);
585 struct xtlock
*xtlck
;
586 struct linelock
*linelock
;
592 if (S_ISDIR(ip
->i_mode
) && (type
& tlckXTREE
) &&
593 !(mp
->xflag
& COMMIT_PAGE
)) {
595 * Directory inode is special. It can have both an xtree tlock
596 * and a dtree tlock associated with it.
603 /* is page not locked by a transaction ? */
607 jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid
, ip
, mp
, lid
);
609 /* is page locked by the requester transaction ? */
610 tlck
= lid_to_tlock(lid
);
611 if ((xtid
= tlck
->tid
) == tid
) {
617 * is page locked by anonymous transaction/lock ?
619 * (page update without transaction (i.e., file write) is
620 * locked under anonymous transaction tid = 0:
621 * anonymous tlocks maintained on anonymous tlock list of
622 * the inode of the page and available to all anonymous
623 * transactions until txCommit() time at which point
624 * they are transferred to the transaction tlock list of
625 * the committing transaction of the inode)
630 tblk
= tid_to_tblock(tid
);
632 * The order of the tlocks in the transaction is important
633 * (during truncate, child xtree pages must be freed before
634 * parent's tlocks change the working map).
635 * Take tlock off anonymous list and add to tail of
638 * Note: We really need to get rid of the tid & lid and
639 * use list_head's. This code is getting UGLY!
641 if (jfs_ip
->atlhead
== lid
) {
642 if (jfs_ip
->atltail
== lid
) {
643 /* only anonymous txn.
644 * Remove from anon_list
647 list_del_init(&jfs_ip
->anon_inode_list
);
650 jfs_ip
->atlhead
= tlck
->next
;
653 for (last
= jfs_ip
->atlhead
;
654 lid_to_tlock(last
)->next
!= lid
;
655 last
= lid_to_tlock(last
)->next
) {
658 lid_to_tlock(last
)->next
= tlck
->next
;
659 if (jfs_ip
->atltail
== lid
)
660 jfs_ip
->atltail
= last
;
663 /* insert the tlock at tail of transaction tlock list */
666 lid_to_tlock(tblk
->last
)->next
= lid
;
682 tlck
= lid_to_tlock(lid
);
691 /* mark tlock for meta-data page */
692 if (mp
->xflag
& COMMIT_PAGE
) {
694 tlck
->flag
= tlckPAGELOCK
;
696 /* mark the page dirty and nohomeok */
697 metapage_nohomeok(mp
);
699 jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
700 mp
, mp
->nohomeok
, tid
, tlck
);
702 /* if anonymous transaction, and buffer is on the group
703 * commit synclist, mark inode to show this. This will
704 * prevent the buffer from being marked nohomeok for too
707 if ((tid
== 0) && mp
->lsn
)
708 set_cflag(COMMIT_Synclist
, ip
);
710 /* mark tlock for in-memory inode */
712 tlck
->flag
= tlckINODELOCK
;
714 if (S_ISDIR(ip
->i_mode
))
715 tlck
->flag
|= tlckDIRECTORY
;
719 /* bind the tlock and the page */
728 * enqueue transaction lock to transaction/inode
730 /* insert the tlock at tail of transaction tlock list */
732 tblk
= tid_to_tblock(tid
);
734 lid_to_tlock(tblk
->last
)->next
= lid
;
740 /* anonymous transaction:
741 * insert the tlock at head of inode anonymous tlock list
744 tlck
->next
= jfs_ip
->atlhead
;
745 jfs_ip
->atlhead
= lid
;
746 if (tlck
->next
== 0) {
747 /* This inode's first anonymous transaction */
748 jfs_ip
->atltail
= lid
;
750 list_add_tail(&jfs_ip
->anon_inode_list
,
751 &TxAnchor
.anon_list
);
756 /* initialize type dependent area for linelock */
757 linelock
= (struct linelock
*) & tlck
->lock
;
759 linelock
->flag
= tlckLINELOCK
;
760 linelock
->maxcnt
= TLOCKSHORT
;
763 switch (type
& tlckTYPE
) {
765 linelock
->l2linesize
= L2DTSLOTSIZE
;
769 linelock
->l2linesize
= L2XTSLOTSIZE
;
771 xtlck
= (struct xtlock
*) linelock
;
772 xtlck
->header
.offset
= 0;
773 xtlck
->header
.length
= 2;
775 if (type
& tlckNEW
) {
776 xtlck
->lwm
.offset
= XTENTRYSTART
;
778 if (mp
->xflag
& COMMIT_PAGE
)
779 p
= (xtpage_t
*) mp
->data
;
781 p
= &jfs_ip
->i_xtroot
;
783 le16_to_cpu(p
->header
.nextindex
);
785 xtlck
->lwm
.length
= 0; /* ! */
786 xtlck
->twm
.offset
= 0;
787 xtlck
->hwm
.offset
= 0;
793 linelock
->l2linesize
= L2INODESLOTSIZE
;
797 linelock
->l2linesize
= L2DATASLOTSIZE
;
801 jfs_err("UFO tlock:0x%p", tlck
);
805 * update tlock vector
813 * page is being locked by another transaction:
816 /* Only locks on ipimap or ipaimap should reach here */
817 /* assert(jfs_ip->fileset == AGGREGATE_I); */
818 if (jfs_ip
->fileset
!= AGGREGATE_I
) {
819 printk(KERN_ERR
"txLock: trying to lock locked page!");
820 print_hex_dump(KERN_ERR
, "ip: ", DUMP_PREFIX_ADDRESS
, 16, 4,
822 print_hex_dump(KERN_ERR
, "mp: ", DUMP_PREFIX_ADDRESS
, 16, 4,
824 print_hex_dump(KERN_ERR
, "Locker's tblock: ",
825 DUMP_PREFIX_ADDRESS
, 16, 4, tid_to_tblock(tid
),
826 sizeof(struct tblock
), 0);
827 print_hex_dump(KERN_ERR
, "Tlock: ", DUMP_PREFIX_ADDRESS
, 16, 4,
828 tlck
, sizeof(*tlck
), 0);
831 INCREMENT(stattx
.waitlock
); /* statistics */
833 release_metapage(mp
);
835 xtid
= tlck
->tid
; /* reacquire after dropping TXN_LOCK */
837 jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
840 /* Recheck everything since dropping TXN_LOCK */
841 if (xtid
&& (tlck
->mp
== mp
) && (mp
->lid
== lid
))
842 TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid
)->waitor
);
845 jfs_info("txLock: awakened tid = %d, lid = %d", tid
, lid
);
853 * FUNCTION: Release buffers associated with transaction locks, but don't
854 * mark homeok yet. The allows other transactions to modify
855 * buffers, but won't let them go to disk until commit record
856 * actually gets written.
861 * RETURN: Errors from subroutines.
863 static void txRelease(struct tblock
* tblk
)
871 for (lid
= tblk
->next
; lid
; lid
= tlck
->next
) {
872 tlck
= lid_to_tlock(lid
);
873 if ((mp
= tlck
->mp
) != NULL
&&
874 (tlck
->type
& tlckBTROOT
) == 0) {
875 assert(mp
->xflag
& COMMIT_PAGE
);
881 * wakeup transactions waiting on a page locked
882 * by the current transaction
884 TXN_WAKEUP(&tblk
->waitor
);
892 * FUNCTION: Initiates pageout of pages modified by tid in journalled
893 * objects and frees their lockwords.
895 static void txUnlock(struct tblock
* tblk
)
898 struct linelock
*linelock
;
899 lid_t lid
, next
, llid
, k
;
905 jfs_info("txUnlock: tblk = 0x%p", tblk
);
906 log
= JFS_SBI(tblk
->sb
)->log
;
909 * mark page under tlock homeok (its log has been written):
911 for (lid
= tblk
->next
; lid
; lid
= next
) {
912 tlck
= lid_to_tlock(lid
);
915 jfs_info("unlocking lid = %d, tlck = 0x%p", lid
, tlck
);
917 /* unbind page from tlock */
918 if ((mp
= tlck
->mp
) != NULL
&&
919 (tlck
->type
& tlckBTROOT
) == 0) {
920 assert(mp
->xflag
& COMMIT_PAGE
);
926 assert(mp
->nohomeok
> 0);
927 _metapage_homeok(mp
);
929 /* inherit younger/larger clsn */
930 LOGSYNC_LOCK(log
, flags
);
932 logdiff(difft
, tblk
->clsn
, log
);
933 logdiff(diffp
, mp
->clsn
, log
);
935 mp
->clsn
= tblk
->clsn
;
937 mp
->clsn
= tblk
->clsn
;
938 LOGSYNC_UNLOCK(log
, flags
);
940 assert(!(tlck
->flag
& tlckFREEPAGE
));
945 /* insert tlock, and linelock(s) of the tlock if any,
946 * at head of freelist
950 llid
= ((struct linelock
*) & tlck
->lock
)->next
;
952 linelock
= (struct linelock
*) lid_to_tlock(llid
);
961 tblk
->next
= tblk
->last
= 0;
964 * remove tblock from logsynclist
965 * (allocation map pages inherited lsn of tblk and
966 * has been inserted in logsync list at txUpdateMap())
969 LOGSYNC_LOCK(log
, flags
);
971 list_del(&tblk
->synclist
);
972 LOGSYNC_UNLOCK(log
, flags
);
979 * function: allocate a transaction lock for freed page/entry;
980 * for freed page, maplock is used as xtlock/dtlock type;
982 struct tlock
*txMaplock(tid_t tid
, struct inode
*ip
, int type
)
984 struct jfs_inode_info
*jfs_ip
= JFS_IP(ip
);
988 struct maplock
*maplock
;
996 tlck
= lid_to_tlock(lid
);
1003 /* bind the tlock and the object */
1004 tlck
->flag
= tlckINODELOCK
;
1005 if (S_ISDIR(ip
->i_mode
))
1006 tlck
->flag
|= tlckDIRECTORY
;
1013 * enqueue transaction lock to transaction/inode
1015 /* insert the tlock at tail of transaction tlock list */
1017 tblk
= tid_to_tblock(tid
);
1019 lid_to_tlock(tblk
->last
)->next
= lid
;
1025 /* anonymous transaction:
1026 * insert the tlock at head of inode anonymous tlock list
1029 tlck
->next
= jfs_ip
->atlhead
;
1030 jfs_ip
->atlhead
= lid
;
1031 if (tlck
->next
== 0) {
1032 /* This inode's first anonymous transaction */
1033 jfs_ip
->atltail
= lid
;
1034 list_add_tail(&jfs_ip
->anon_inode_list
,
1035 &TxAnchor
.anon_list
);
1041 /* initialize type dependent area for maplock */
1042 maplock
= (struct maplock
*) & tlck
->lock
;
1044 maplock
->maxcnt
= 0;
1053 * function: allocate a transaction lock for log vector list
1055 struct linelock
*txLinelock(struct linelock
* tlock
)
1059 struct linelock
*linelock
;
1063 /* allocate a TxLock structure */
1064 lid
= txLockAlloc();
1065 tlck
= lid_to_tlock(lid
);
1069 /* initialize linelock */
1070 linelock
= (struct linelock
*) tlck
;
1072 linelock
->flag
= tlckLINELOCK
;
1073 linelock
->maxcnt
= TLOCKLONG
;
1074 linelock
->index
= 0;
1075 if (tlck
->flag
& tlckDIRECTORY
)
1076 linelock
->flag
|= tlckDIRECTORY
;
1078 /* append linelock after tlock */
1079 linelock
->next
= tlock
->next
;
1086 * transaction commit management
1087 * -----------------------------
1093 * FUNCTION: commit the changes to the objects specified in
1094 * clist. For journalled segments only the
1095 * changes of the caller are committed, ie by tid.
1096 * for non-journalled segments the data are flushed to
1097 * disk and then the change to the disk inode and indirect
1098 * blocks committed (so blocks newly allocated to the
1099 * segment will be made a part of the segment atomically).
1101 * all of the segments specified in clist must be in
1102 * one file system. no more than 6 segments are needed
1103 * to handle all unix svcs.
1105 * if the i_nlink field (i.e. disk inode link count)
1106 * is zero, and the type of inode is a regular file or
1107 * directory, or symbolic link , the inode is truncated
1108 * to zero length. the truncation is committed but the
1109 * VM resources are unaffected until it is closed (see
1117 * on entry the inode lock on each segment is assumed
1122 int txCommit(tid_t tid
, /* transaction identifier */
1123 int nip
, /* number of inodes to commit */
1124 struct inode
**iplist
, /* list of inode to commit */
1129 struct jfs_log
*log
;
1130 struct tblock
*tblk
;
1133 struct jfs_inode_info
*jfs_ip
;
1136 struct super_block
*sb
;
1138 jfs_info("txCommit, tid = %d, flag = %d", tid
, flag
);
1139 /* is read-only file system ? */
1140 if (isReadOnly(iplist
[0])) {
1145 sb
= cd
.sb
= iplist
[0]->i_sb
;
1149 tid
= txBegin(sb
, 0);
1150 tblk
= tid_to_tblock(tid
);
1153 * initialize commit structure
1155 log
= JFS_SBI(sb
)->log
;
1158 /* initialize log record descriptor in commit */
1160 lrd
->logtid
= cpu_to_le32(tblk
->logtid
);
1163 tblk
->xflag
|= flag
;
1165 if ((flag
& (COMMIT_FORCE
| COMMIT_SYNC
)) == 0)
1166 tblk
->xflag
|= COMMIT_LAZY
;
1168 * prepare non-journaled objects for commit
1170 * flush data pages of non-journaled file
1171 * to prevent the file getting non-initialized disk blocks
1179 * acquire transaction lock on (on-disk) inodes
1181 * update on-disk inode from in-memory inode
1182 * acquiring transaction locks for AFTER records
1183 * on the on-disk inode of file object
1185 * sort the inodes array by inode number in descending order
1186 * to prevent deadlock when acquiring transaction lock
1187 * of on-disk inodes on multiple on-disk inode pages by
1188 * multiple concurrent transactions
1190 for (k
= 0; k
< cd
.nip
; k
++) {
1191 top
= (cd
.iplist
[k
])->i_ino
;
1192 for (n
= k
+ 1; n
< cd
.nip
; n
++) {
1194 if (ip
->i_ino
> top
) {
1196 cd
.iplist
[n
] = cd
.iplist
[k
];
1202 jfs_ip
= JFS_IP(ip
);
1205 * BUGBUG - This code has temporarily been removed. The
1206 * intent is to ensure that any file data is written before
1207 * the metadata is committed to the journal. This prevents
1208 * uninitialized data from appearing in a file after the
1209 * journal has been replayed. (The uninitialized data
1210 * could be sensitive data removed by another user.)
1212 * The problem now is that we are holding the IWRITELOCK
1213 * on the inode, and calling filemap_fdatawrite on an
1214 * unmapped page will cause a deadlock in jfs_get_block.
1216 * The long term solution is to pare down the use of
1217 * IWRITELOCK. We are currently holding it too long.
1218 * We could also be smarter about which data pages need
1219 * to be written before the transaction is committed and
1220 * when we don't need to worry about it at all.
1222 * if ((!S_ISDIR(ip->i_mode))
1223 * && (tblk->flag & COMMIT_DELETE) == 0)
1224 * filemap_write_and_wait(ip->i_mapping);
1228 * Mark inode as not dirty. It will still be on the dirty
1229 * inode list, but we'll know not to commit it again unless
1230 * it gets marked dirty again
1232 clear_cflag(COMMIT_Dirty
, ip
);
1234 /* inherit anonymous tlock(s) of inode */
1235 if (jfs_ip
->atlhead
) {
1236 lid_to_tlock(jfs_ip
->atltail
)->next
= tblk
->next
;
1237 tblk
->next
= jfs_ip
->atlhead
;
1239 tblk
->last
= jfs_ip
->atltail
;
1240 jfs_ip
->atlhead
= jfs_ip
->atltail
= 0;
1242 list_del_init(&jfs_ip
->anon_inode_list
);
1247 * acquire transaction lock on on-disk inode page
1248 * (become first tlock of the tblk's tlock list)
1250 if (((rc
= diWrite(tid
, ip
))))
1255 * write log records from transaction locks
1257 * txUpdateMap() resets XAD_NEW in XAD.
1259 txLog(log
, tblk
, &cd
);
1262 * Ensure that inode isn't reused before
1263 * lazy commit thread finishes processing
1265 if (tblk
->xflag
& COMMIT_DELETE
) {
1268 * Avoid a rare deadlock
1270 * If the inode is locked, we may be blocked in
1271 * jfs_commit_inode. If so, we don't want the
1272 * lazy_commit thread doing the last iput() on the inode
1273 * since that may block on the locked inode. Instead,
1274 * commit the transaction synchronously, so the last iput
1275 * will be done by the calling thread (or later)
1278 * I believe this code is no longer needed. Splitting I_LOCK
1279 * into two bits, I_NEW and I_SYNC should prevent this
1280 * deadlock as well. But since I don't have a JFS testload
1281 * to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
1284 if (tblk
->u
.ip
->i_state
& I_SYNC
)
1285 tblk
->xflag
&= ~COMMIT_LAZY
;
1288 ASSERT((!(tblk
->xflag
& COMMIT_DELETE
)) ||
1289 ((tblk
->u
.ip
->i_nlink
== 0) &&
1290 !test_cflag(COMMIT_Nolink
, tblk
->u
.ip
)));
1293 * write COMMIT log record
1295 lrd
->type
= cpu_to_le16(LOG_COMMIT
);
1297 lmLog(log
, tblk
, lrd
, NULL
);
1299 lmGroupCommit(log
, tblk
);
1302 * - transaction is now committed -
1306 * force pages in careful update
1307 * (imap addressing structure update)
1309 if (flag
& COMMIT_FORCE
)
1313 * update allocation map.
1315 * update inode allocation map and inode:
1316 * free pager lock on memory object of inode if any.
1317 * update block allocation map.
1319 * txUpdateMap() resets XAD_NEW in XAD.
1321 if (tblk
->xflag
& COMMIT_FORCE
)
1325 * free transaction locks and pageout/free pages
1329 if ((tblk
->flag
& tblkGC_LAZY
) == 0)
1334 * reset in-memory object state
1336 for (k
= 0; k
< cd
.nip
; k
++) {
1338 jfs_ip
= JFS_IP(ip
);
1341 * reset in-memory inode state
1352 jfs_info("txCommit: tid = %d, returning %d", tid
, rc
);
1359 * FUNCTION: Writes AFTER log records for all lines modified
1360 * by tid for segments specified by inodes in comdata.
1361 * Code assumes only WRITELOCKS are recorded in lockwords.
1367 static void txLog(struct jfs_log
*log
, struct tblock
*tblk
, struct commit
*cd
)
1372 struct lrd
*lrd
= &cd
->lrd
;
1375 * write log record(s) for each tlock of transaction,
1377 for (lid
= tblk
->next
; lid
; lid
= tlck
->next
) {
1378 tlck
= lid_to_tlock(lid
);
1380 tlck
->flag
|= tlckLOG
;
1382 /* initialize lrd common */
1384 lrd
->aggregate
= cpu_to_le32(JFS_SBI(ip
->i_sb
)->aggregate
);
1385 lrd
->log
.redopage
.fileset
= cpu_to_le32(JFS_IP(ip
)->fileset
);
1386 lrd
->log
.redopage
.inode
= cpu_to_le32(ip
->i_ino
);
1388 /* write log record of page from the tlock */
1389 switch (tlck
->type
& tlckTYPE
) {
1391 xtLog(log
, tblk
, lrd
, tlck
);
1395 dtLog(log
, tblk
, lrd
, tlck
);
1399 diLog(log
, tblk
, lrd
, tlck
, cd
);
1403 mapLog(log
, tblk
, lrd
, tlck
);
1407 dataLog(log
, tblk
, lrd
, tlck
);
1411 jfs_err("UFO tlock:0x%p", tlck
);
1421 * function: log inode tlock and format maplock to update bmap;
1423 static void diLog(struct jfs_log
*log
, struct tblock
*tblk
, struct lrd
*lrd
,
1424 struct tlock
*tlck
, struct commit
*cd
)
1426 struct metapage
*mp
;
1428 struct pxd_lock
*pxdlock
;
1432 /* initialize as REDOPAGE record format */
1433 lrd
->log
.redopage
.type
= cpu_to_le16(LOG_INODE
);
1434 lrd
->log
.redopage
.l2linesize
= cpu_to_le16(L2INODESLOTSIZE
);
1436 pxd
= &lrd
->log
.redopage
.pxd
;
1441 if (tlck
->type
& tlckENTRY
) {
1442 /* log after-image for logredo(): */
1443 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1444 PXDaddress(pxd
, mp
->index
);
1446 mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1447 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1449 /* mark page as homeward bound */
1450 tlck
->flag
|= tlckWRITEPAGE
;
1451 } else if (tlck
->type
& tlckFREE
) {
1455 * (pages of the freed inode extent have been invalidated and
1456 * a maplock for free of the extent has been formatted at
1459 * the tlock had been acquired on the inode allocation map page
1460 * (iag) that specifies the freed extent, even though the map
1461 * page is not itself logged, to prevent pageout of the map
1462 * page before the log;
1465 /* log LOG_NOREDOINOEXT of the freed inode extent for
1466 * logredo() to start NoRedoPage filters, and to update
1467 * imap and bmap for free of the extent;
1469 lrd
->type
= cpu_to_le16(LOG_NOREDOINOEXT
);
1471 * For the LOG_NOREDOINOEXT record, we need
1472 * to pass the IAG number and inode extent
1473 * index (within that IAG) from which the
1474 * extent is being released. These have been
1475 * passed to us in the iplist[1] and iplist[2].
1477 lrd
->log
.noredoinoext
.iagnum
=
1478 cpu_to_le32((u32
) (size_t) cd
->iplist
[1]);
1479 lrd
->log
.noredoinoext
.inoext_idx
=
1480 cpu_to_le32((u32
) (size_t) cd
->iplist
[2]);
1482 pxdlock
= (struct pxd_lock
*) & tlck
->lock
;
1483 *pxd
= pxdlock
->pxd
;
1484 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
1487 tlck
->flag
|= tlckUPDATEMAP
;
1489 /* mark page as homeward bound */
1490 tlck
->flag
|= tlckWRITEPAGE
;
1492 jfs_err("diLog: UFO type tlck:0x%p", tlck
);
1499 * function: log data tlock
1501 static void dataLog(struct jfs_log
*log
, struct tblock
*tblk
, struct lrd
*lrd
,
1504 struct metapage
*mp
;
1509 /* initialize as REDOPAGE record format */
1510 lrd
->log
.redopage
.type
= cpu_to_le16(LOG_DATA
);
1511 lrd
->log
.redopage
.l2linesize
= cpu_to_le16(L2DATASLOTSIZE
);
1513 pxd
= &lrd
->log
.redopage
.pxd
;
1515 /* log after-image for logredo(): */
1516 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1518 if (jfs_dirtable_inline(tlck
->ip
)) {
1520 * The table has been truncated, we've must have deleted
1521 * the last entry, so don't bother logging this
1525 metapage_homeok(mp
);
1526 discard_metapage(mp
);
1531 PXDaddress(pxd
, mp
->index
);
1532 PXDlength(pxd
, mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1534 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1536 /* mark page as homeward bound */
1537 tlck
->flag
|= tlckWRITEPAGE
;
1545 * function: log dtree tlock and format maplock to update bmap;
1547 static void dtLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
1548 struct tlock
* tlck
)
1550 struct metapage
*mp
;
1551 struct pxd_lock
*pxdlock
;
1556 /* initialize as REDOPAGE/NOREDOPAGE record format */
1557 lrd
->log
.redopage
.type
= cpu_to_le16(LOG_DTREE
);
1558 lrd
->log
.redopage
.l2linesize
= cpu_to_le16(L2DTSLOTSIZE
);
1560 pxd
= &lrd
->log
.redopage
.pxd
;
1562 if (tlck
->type
& tlckBTROOT
)
1563 lrd
->log
.redopage
.type
|= cpu_to_le16(LOG_BTROOT
);
1566 * page extension via relocation: entry insertion;
1567 * page extension in-place: entry insertion;
1568 * new right page from page split, reinitialized in-line
1569 * root from root page split: entry insertion;
1571 if (tlck
->type
& (tlckNEW
| tlckEXTEND
)) {
1572 /* log after-image of the new page for logredo():
1573 * mark log (LOG_NEW) for logredo() to initialize
1574 * freelist and update bmap for alloc of the new page;
1576 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1577 if (tlck
->type
& tlckEXTEND
)
1578 lrd
->log
.redopage
.type
|= cpu_to_le16(LOG_EXTEND
);
1580 lrd
->log
.redopage
.type
|= cpu_to_le16(LOG_NEW
);
1581 PXDaddress(pxd
, mp
->index
);
1583 mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1584 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1586 /* format a maplock for txUpdateMap() to update bPMAP for
1587 * alloc of the new page;
1589 if (tlck
->type
& tlckBTROOT
)
1591 tlck
->flag
|= tlckUPDATEMAP
;
1592 pxdlock
= (struct pxd_lock
*) & tlck
->lock
;
1593 pxdlock
->flag
= mlckALLOCPXD
;
1594 pxdlock
->pxd
= *pxd
;
1598 /* mark page as homeward bound */
1599 tlck
->flag
|= tlckWRITEPAGE
;
1604 * entry insertion/deletion,
1605 * sibling page link update (old right page before split);
1607 if (tlck
->type
& (tlckENTRY
| tlckRELINK
)) {
1608 /* log after-image for logredo(): */
1609 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1610 PXDaddress(pxd
, mp
->index
);
1612 mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1613 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1615 /* mark page as homeward bound */
1616 tlck
->flag
|= tlckWRITEPAGE
;
1621 * page deletion: page has been invalidated
1622 * page relocation: source extent
1624 * a maplock for free of the page has been formatted
1625 * at txLock() time);
1627 if (tlck
->type
& (tlckFREE
| tlckRELOCATE
)) {
1628 /* log LOG_NOREDOPAGE of the deleted page for logredo()
1629 * to start NoRedoPage filter and to update bmap for free
1630 * of the deletd page
1632 lrd
->type
= cpu_to_le16(LOG_NOREDOPAGE
);
1633 pxdlock
= (struct pxd_lock
*) & tlck
->lock
;
1634 *pxd
= pxdlock
->pxd
;
1635 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
1637 /* a maplock for txUpdateMap() for free of the page
1638 * has been formatted at txLock() time;
1640 tlck
->flag
|= tlckUPDATEMAP
;
1648 * function: log xtree tlock and format maplock to update bmap;
1650 static void xtLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
1651 struct tlock
* tlck
)
1654 struct metapage
*mp
;
1656 struct xtlock
*xtlck
;
1657 struct maplock
*maplock
;
1658 struct xdlistlock
*xadlock
;
1659 struct pxd_lock
*pxdlock
;
1666 /* initialize as REDOPAGE/NOREDOPAGE record format */
1667 lrd
->log
.redopage
.type
= cpu_to_le16(LOG_XTREE
);
1668 lrd
->log
.redopage
.l2linesize
= cpu_to_le16(L2XTSLOTSIZE
);
1670 page_pxd
= &lrd
->log
.redopage
.pxd
;
1672 if (tlck
->type
& tlckBTROOT
) {
1673 lrd
->log
.redopage
.type
|= cpu_to_le16(LOG_BTROOT
);
1674 p
= &JFS_IP(ip
)->i_xtroot
;
1675 if (S_ISDIR(ip
->i_mode
))
1676 lrd
->log
.redopage
.type
|=
1677 cpu_to_le16(LOG_DIR_XTREE
);
1679 p
= (xtpage_t
*) mp
->data
;
1680 next
= le16_to_cpu(p
->header
.nextindex
);
1682 xtlck
= (struct xtlock
*) & tlck
->lock
;
1684 maplock
= (struct maplock
*) & tlck
->lock
;
1685 xadlock
= (struct xdlistlock
*) maplock
;
1688 * entry insertion/extension;
1689 * sibling page link update (old right page before split);
1691 if (tlck
->type
& (tlckNEW
| tlckGROW
| tlckRELINK
)) {
1692 /* log after-image for logredo():
1693 * logredo() will update bmap for alloc of new/extended
1694 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1695 * after-image of XADlist;
1696 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1697 * applying the after-image to the meta-data page.
1699 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1700 PXDaddress(page_pxd
, mp
->index
);
1702 mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1703 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1705 /* format a maplock for txUpdateMap() to update bPMAP
1706 * for alloc of new/extended extents of XAD[lwm:next)
1707 * from the page itself;
1708 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
1710 lwm
= xtlck
->lwm
.offset
;
1712 lwm
= XTPAGEMAXSLOT
;
1717 jfs_err("xtLog: lwm > next");
1720 tlck
->flag
|= tlckUPDATEMAP
;
1721 xadlock
->flag
= mlckALLOCXADLIST
;
1722 xadlock
->count
= next
- lwm
;
1723 if ((xadlock
->count
<= 4) && (tblk
->xflag
& COMMIT_LAZY
)) {
1727 * Lazy commit may allow xtree to be modified before
1728 * txUpdateMap runs. Copy xad into linelock to
1729 * preserve correct data.
1731 * We can fit twice as may pxd's as xads in the lock
1733 xadlock
->flag
= mlckALLOCPXDLIST
;
1734 pxd
= xadlock
->xdlist
= &xtlck
->pxdlock
;
1735 for (i
= 0; i
< xadlock
->count
; i
++) {
1736 PXDaddress(pxd
, addressXAD(&p
->xad
[lwm
+ i
]));
1737 PXDlength(pxd
, lengthXAD(&p
->xad
[lwm
+ i
]));
1738 p
->xad
[lwm
+ i
].flag
&=
1739 ~(XAD_NEW
| XAD_EXTENDED
);
1744 * xdlist will point to into inode's xtree, ensure
1745 * that transaction is not committed lazily.
1747 xadlock
->flag
= mlckALLOCXADLIST
;
1748 xadlock
->xdlist
= &p
->xad
[lwm
];
1749 tblk
->xflag
&= ~COMMIT_LAZY
;
1751 jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d count:%d",
1752 tlck
->ip
, mp
, tlck
, lwm
, xadlock
->count
);
1757 /* mark page as homeward bound */
1758 tlck
->flag
|= tlckWRITEPAGE
;
1764 * page deletion: file deletion/truncation (ref. xtTruncate())
1766 * (page will be invalidated after log is written and bmap
1767 * is updated from the page);
1769 if (tlck
->type
& tlckFREE
) {
1770 /* LOG_NOREDOPAGE log for NoRedoPage filter:
1771 * if page free from file delete, NoRedoFile filter from
1772 * inode image of zero link count will subsume NoRedoPage
1773 * filters for each page;
1774 * if page free from file truncattion, write NoRedoPage
1777 * upadte of block allocation map for the page itself:
1778 * if page free from deletion and truncation, LOG_UPDATEMAP
1779 * log for the page itself is generated from processing
1780 * its parent page xad entries;
1782 /* if page free from file truncation, log LOG_NOREDOPAGE
1783 * of the deleted page for logredo() to start NoRedoPage
1784 * filter for the page;
1786 if (tblk
->xflag
& COMMIT_TRUNCATE
) {
1787 /* write NOREDOPAGE for the page */
1788 lrd
->type
= cpu_to_le16(LOG_NOREDOPAGE
);
1789 PXDaddress(page_pxd
, mp
->index
);
1791 mp
->logical_size
>> tblk
->sb
->
1794 cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
1796 if (tlck
->type
& tlckBTROOT
) {
1797 /* Empty xtree must be logged */
1798 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1800 cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1804 /* init LOG_UPDATEMAP of the freed extents
1805 * XAD[XTENTRYSTART:hwm) from the deleted page itself
1806 * for logredo() to update bmap;
1808 lrd
->type
= cpu_to_le16(LOG_UPDATEMAP
);
1809 lrd
->log
.updatemap
.type
= cpu_to_le16(LOG_FREEXADLIST
);
1810 xtlck
= (struct xtlock
*) & tlck
->lock
;
1811 hwm
= xtlck
->hwm
.offset
;
1812 lrd
->log
.updatemap
.nxd
=
1813 cpu_to_le16(hwm
- XTENTRYSTART
+ 1);
1814 /* reformat linelock for lmLog() */
1815 xtlck
->header
.offset
= XTENTRYSTART
;
1816 xtlck
->header
.length
= hwm
- XTENTRYSTART
+ 1;
1818 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1820 /* format a maplock for txUpdateMap() to update bmap
1821 * to free extents of XAD[XTENTRYSTART:hwm) from the
1822 * deleted page itself;
1824 tlck
->flag
|= tlckUPDATEMAP
;
1825 xadlock
->count
= hwm
- XTENTRYSTART
+ 1;
1826 if ((xadlock
->count
<= 4) && (tblk
->xflag
& COMMIT_LAZY
)) {
1830 * Lazy commit may allow xtree to be modified before
1831 * txUpdateMap runs. Copy xad into linelock to
1832 * preserve correct data.
1834 * We can fit twice as may pxd's as xads in the lock
1836 xadlock
->flag
= mlckFREEPXDLIST
;
1837 pxd
= xadlock
->xdlist
= &xtlck
->pxdlock
;
1838 for (i
= 0; i
< xadlock
->count
; i
++) {
1840 addressXAD(&p
->xad
[XTENTRYSTART
+ i
]));
1842 lengthXAD(&p
->xad
[XTENTRYSTART
+ i
]));
1847 * xdlist will point to into inode's xtree, ensure
1848 * that transaction is not committed lazily.
1850 xadlock
->flag
= mlckFREEXADLIST
;
1851 xadlock
->xdlist
= &p
->xad
[XTENTRYSTART
];
1852 tblk
->xflag
&= ~COMMIT_LAZY
;
1854 jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2",
1855 tlck
->ip
, mp
, xadlock
->count
);
1859 /* mark page as invalid */
1860 if (((tblk
->xflag
& COMMIT_PWMAP
) || S_ISDIR(ip
->i_mode
))
1861 && !(tlck
->type
& tlckBTROOT
))
1862 tlck
->flag
|= tlckFREEPAGE
;
1864 else (tblk->xflag & COMMIT_PMAP)
1871 * page/entry truncation: file truncation (ref. xtTruncate())
1873 * |----------+------+------+---------------|
1875 * | | hwm - hwm before truncation
1876 * | next - truncation point
1877 * lwm - lwm before truncation
1880 if (tlck
->type
& tlckTRUNCATE
) {
1881 pxd_t pxd
; /* truncated extent of xad */
1885 * For truncation the entire linelock may be used, so it would
1886 * be difficult to store xad list in linelock itself.
1887 * Therefore, we'll just force transaction to be committed
1888 * synchronously, so that xtree pages won't be changed before
1891 tblk
->xflag
&= ~COMMIT_LAZY
;
1892 lwm
= xtlck
->lwm
.offset
;
1894 lwm
= XTPAGEMAXSLOT
;
1895 hwm
= xtlck
->hwm
.offset
;
1896 twm
= xtlck
->twm
.offset
;
1901 /* log after-image for logredo():
1903 * logredo() will update bmap for alloc of new/extended
1904 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1905 * after-image of XADlist;
1906 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1907 * applying the after-image to the meta-data page.
1909 lrd
->type
= cpu_to_le16(LOG_REDOPAGE
);
1910 PXDaddress(page_pxd
, mp
->index
);
1912 mp
->logical_size
>> tblk
->sb
->s_blocksize_bits
);
1913 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1916 * truncate entry XAD[twm == next - 1]:
1918 if (twm
== next
- 1) {
1919 /* init LOG_UPDATEMAP for logredo() to update bmap for
1920 * free of truncated delta extent of the truncated
1921 * entry XAD[next - 1]:
1922 * (xtlck->pxdlock = truncated delta extent);
1924 pxdlock
= (struct pxd_lock
*) & xtlck
->pxdlock
;
1925 /* assert(pxdlock->type & tlckTRUNCATE); */
1926 lrd
->type
= cpu_to_le16(LOG_UPDATEMAP
);
1927 lrd
->log
.updatemap
.type
= cpu_to_le16(LOG_FREEPXD
);
1928 lrd
->log
.updatemap
.nxd
= cpu_to_le16(1);
1929 lrd
->log
.updatemap
.pxd
= pxdlock
->pxd
;
1930 pxd
= pxdlock
->pxd
; /* save to format maplock */
1932 cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
1936 * free entries XAD[next:hwm]:
1939 /* init LOG_UPDATEMAP of the freed extents
1940 * XAD[next:hwm] from the deleted page itself
1941 * for logredo() to update bmap;
1943 lrd
->type
= cpu_to_le16(LOG_UPDATEMAP
);
1944 lrd
->log
.updatemap
.type
=
1945 cpu_to_le16(LOG_FREEXADLIST
);
1946 xtlck
= (struct xtlock
*) & tlck
->lock
;
1947 hwm
= xtlck
->hwm
.offset
;
1948 lrd
->log
.updatemap
.nxd
=
1949 cpu_to_le16(hwm
- next
+ 1);
1950 /* reformat linelock for lmLog() */
1951 xtlck
->header
.offset
= next
;
1952 xtlck
->header
.length
= hwm
- next
+ 1;
1955 cpu_to_le32(lmLog(log
, tblk
, lrd
, tlck
));
1959 * format maplock(s) for txUpdateMap() to update bmap
1964 * allocate entries XAD[lwm:next):
1967 /* format a maplock for txUpdateMap() to update bPMAP
1968 * for alloc of new/extended extents of XAD[lwm:next)
1969 * from the page itself;
1970 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
1972 tlck
->flag
|= tlckUPDATEMAP
;
1973 xadlock
->flag
= mlckALLOCXADLIST
;
1974 xadlock
->count
= next
- lwm
;
1975 xadlock
->xdlist
= &p
->xad
[lwm
];
1977 jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d lwm:%d next:%d",
1978 tlck
->ip
, mp
, xadlock
->count
, lwm
, next
);
1984 * truncate entry XAD[twm == next - 1]:
1986 if (twm
== next
- 1) {
1987 /* format a maplock for txUpdateMap() to update bmap
1988 * to free truncated delta extent of the truncated
1989 * entry XAD[next - 1];
1990 * (xtlck->pxdlock = truncated delta extent);
1992 tlck
->flag
|= tlckUPDATEMAP
;
1993 pxdlock
= (struct pxd_lock
*) xadlock
;
1994 pxdlock
->flag
= mlckFREEPXD
;
1998 jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d hwm:%d",
1999 ip
, mp
, pxdlock
->count
, hwm
);
2005 * free entries XAD[next:hwm]:
2008 /* format a maplock for txUpdateMap() to update bmap
2009 * to free extents of XAD[next:hwm] from thedeleted
2012 tlck
->flag
|= tlckUPDATEMAP
;
2013 xadlock
->flag
= mlckFREEXADLIST
;
2014 xadlock
->count
= hwm
- next
+ 1;
2015 xadlock
->xdlist
= &p
->xad
[next
];
2017 jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d next:%d hwm:%d",
2018 tlck
->ip
, mp
, xadlock
->count
, next
, hwm
);
2022 /* mark page as homeward bound */
2023 tlck
->flag
|= tlckWRITEPAGE
;
2031 * function: log from maplock of freed data extents;
2033 static void mapLog(struct jfs_log
* log
, struct tblock
* tblk
, struct lrd
* lrd
,
2034 struct tlock
* tlck
)
2036 struct pxd_lock
*pxdlock
;
2041 * page relocation: free the source page extent
2043 * a maplock for txUpdateMap() for free of the page
2044 * has been formatted at txLock() time saving the src
2045 * relocated page address;
2047 if (tlck
->type
& tlckRELOCATE
) {
2048 /* log LOG_NOREDOPAGE of the old relocated page
2049 * for logredo() to start NoRedoPage filter;
2051 lrd
->type
= cpu_to_le16(LOG_NOREDOPAGE
);
2052 pxdlock
= (struct pxd_lock
*) & tlck
->lock
;
2053 pxd
= &lrd
->log
.redopage
.pxd
;
2054 *pxd
= pxdlock
->pxd
;
2055 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
2057 /* (N.B. currently, logredo() does NOT update bmap
2058 * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
2059 * if page free from relocation, LOG_UPDATEMAP log is
2060 * specifically generated now for logredo()
2061 * to update bmap for free of src relocated page;
2062 * (new flag LOG_RELOCATE may be introduced which will
2063 * inform logredo() to start NORedoPage filter and also
2064 * update block allocation map at the same time, thus
2065 * avoiding an extra log write);
2067 lrd
->type
= cpu_to_le16(LOG_UPDATEMAP
);
2068 lrd
->log
.updatemap
.type
= cpu_to_le16(LOG_FREEPXD
);
2069 lrd
->log
.updatemap
.nxd
= cpu_to_le16(1);
2070 lrd
->log
.updatemap
.pxd
= pxdlock
->pxd
;
2071 lrd
->backchain
= cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
2073 /* a maplock for txUpdateMap() for free of the page
2074 * has been formatted at txLock() time;
2076 tlck
->flag
|= tlckUPDATEMAP
;
2081 * Otherwise it's not a relocate request
2085 /* log LOG_UPDATEMAP for logredo() to update bmap for
2086 * free of truncated/relocated delta extent of the data;
2087 * e.g.: external EA extent, relocated/truncated extent
2088 * from xtTailgate();
2090 lrd
->type
= cpu_to_le16(LOG_UPDATEMAP
);
2091 pxdlock
= (struct pxd_lock
*) & tlck
->lock
;
2092 nlock
= pxdlock
->index
;
2093 for (i
= 0; i
< nlock
; i
++, pxdlock
++) {
2094 if (pxdlock
->flag
& mlckALLOCPXD
)
2095 lrd
->log
.updatemap
.type
=
2096 cpu_to_le16(LOG_ALLOCPXD
);
2098 lrd
->log
.updatemap
.type
=
2099 cpu_to_le16(LOG_FREEPXD
);
2100 lrd
->log
.updatemap
.nxd
= cpu_to_le16(1);
2101 lrd
->log
.updatemap
.pxd
= pxdlock
->pxd
;
2103 cpu_to_le32(lmLog(log
, tblk
, lrd
, NULL
));
2104 jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
2105 (ulong
) addressPXD(&pxdlock
->pxd
),
2106 lengthPXD(&pxdlock
->pxd
));
2110 tlck
->flag
|= tlckUPDATEMAP
;
2117 * function: acquire maplock for EA/ACL extents or
2118 * set COMMIT_INLINE flag;
2120 void txEA(tid_t tid
, struct inode
*ip
, dxd_t
* oldea
, dxd_t
* newea
)
2122 struct tlock
*tlck
= NULL
;
2123 struct pxd_lock
*maplock
= NULL
, *pxdlock
= NULL
;
2126 * format maplock for alloc of new EA extent
2129 /* Since the newea could be a completely zeroed entry we need to
2130 * check for the two flags which indicate we should actually
2131 * commit new EA data
2133 if (newea
->flag
& DXD_EXTENT
) {
2134 tlck
= txMaplock(tid
, ip
, tlckMAP
);
2135 maplock
= (struct pxd_lock
*) & tlck
->lock
;
2136 pxdlock
= (struct pxd_lock
*) maplock
;
2137 pxdlock
->flag
= mlckALLOCPXD
;
2138 PXDaddress(&pxdlock
->pxd
, addressDXD(newea
));
2139 PXDlength(&pxdlock
->pxd
, lengthDXD(newea
));
2142 } else if (newea
->flag
& DXD_INLINE
) {
2145 set_cflag(COMMIT_Inlineea
, ip
);
2150 * format maplock for free of old EA extent
2152 if (!test_cflag(COMMIT_Nolink
, ip
) && oldea
->flag
& DXD_EXTENT
) {
2154 tlck
= txMaplock(tid
, ip
, tlckMAP
);
2155 maplock
= (struct pxd_lock
*) & tlck
->lock
;
2156 pxdlock
= (struct pxd_lock
*) maplock
;
2159 pxdlock
->flag
= mlckFREEPXD
;
2160 PXDaddress(&pxdlock
->pxd
, addressDXD(oldea
));
2161 PXDlength(&pxdlock
->pxd
, lengthDXD(oldea
));
2169 * function: synchronously write pages locked by transaction
2170 * after txLog() but before txUpdateMap();
2172 static void txForce(struct tblock
* tblk
)
2176 struct metapage
*mp
;
2179 * reverse the order of transaction tlocks in
2180 * careful update order of address index pages
2181 * (right to left, bottom up)
2183 tlck
= lid_to_tlock(tblk
->next
);
2187 tlck
= lid_to_tlock(lid
);
2189 tlck
->next
= tblk
->next
;
2195 * synchronously write the page, and
2196 * hold the page for txUpdateMap();
2198 for (lid
= tblk
->next
; lid
; lid
= next
) {
2199 tlck
= lid_to_tlock(lid
);
2202 if ((mp
= tlck
->mp
) != NULL
&&
2203 (tlck
->type
& tlckBTROOT
) == 0) {
2204 assert(mp
->xflag
& COMMIT_PAGE
);
2206 if (tlck
->flag
& tlckWRITEPAGE
) {
2207 tlck
->flag
&= ~tlckWRITEPAGE
;
2209 /* do not release page to freelist */
2213 * The "right" thing to do here is to
2214 * synchronously write the metadata.
2215 * With the current implementation this
2216 * is hard since write_metapage requires
2217 * us to kunmap & remap the page. If we
2218 * have tlocks pointing into the metadata
2219 * pages, we don't want to do this. I think
2220 * we can get by with synchronously writing
2221 * the pages when they are released.
2223 assert(mp
->nohomeok
);
2224 set_bit(META_dirty
, &mp
->flag
);
2225 set_bit(META_sync
, &mp
->flag
);
2235 * function: update persistent allocation map (and working map
2240 static void txUpdateMap(struct tblock
* tblk
)
2243 struct inode
*ipimap
;
2246 struct maplock
*maplock
;
2247 struct pxd_lock pxdlock
;
2250 struct metapage
*mp
= NULL
;
2252 ipimap
= JFS_SBI(tblk
->sb
)->ipimap
;
2254 maptype
= (tblk
->xflag
& COMMIT_PMAP
) ? COMMIT_PMAP
: COMMIT_PWMAP
;
2258 * update block allocation map
2260 * update allocation state in pmap (and wmap) and
2261 * update lsn of the pmap page;
2264 * scan each tlock/page of transaction for block allocation/free:
2266 * for each tlock/page of transaction, update map.
2267 * ? are there tlock for pmap and pwmap at the same time ?
2269 for (lid
= tblk
->next
; lid
; lid
= tlck
->next
) {
2270 tlck
= lid_to_tlock(lid
);
2272 if ((tlck
->flag
& tlckUPDATEMAP
) == 0)
2275 if (tlck
->flag
& tlckFREEPAGE
) {
2277 * Another thread may attempt to reuse freed space
2278 * immediately, so we want to get rid of the metapage
2279 * before anyone else has a chance to get it.
2280 * Lock metapage, update maps, then invalidate
2284 ASSERT(mp
->xflag
& COMMIT_PAGE
);
2290 * . in-line PXD list:
2291 * . out-of-line XAD list:
2293 maplock
= (struct maplock
*) & tlck
->lock
;
2294 nlock
= maplock
->index
;
2296 for (k
= 0; k
< nlock
; k
++, maplock
++) {
2298 * allocate blocks in persistent map:
2300 * blocks have been allocated from wmap at alloc time;
2302 if (maplock
->flag
& mlckALLOC
) {
2303 txAllocPMap(ipimap
, maplock
, tblk
);
2306 * free blocks in persistent and working map:
2307 * blocks will be freed in pmap and then in wmap;
2309 * ? tblock specifies the PMAP/PWMAP based upon
2312 * free blocks in persistent map:
2313 * blocks will be freed from wmap at last reference
2314 * release of the object for regular files;
2316 * Alway free blocks from both persistent & working
2317 * maps for directories
2319 else { /* (maplock->flag & mlckFREE) */
2321 if (tlck
->flag
& tlckDIRECTORY
)
2322 txFreeMap(ipimap
, maplock
,
2323 tblk
, COMMIT_PWMAP
);
2325 txFreeMap(ipimap
, maplock
,
2329 if (tlck
->flag
& tlckFREEPAGE
) {
2330 if (!(tblk
->flag
& tblkGC_LAZY
)) {
2331 /* This is equivalent to txRelease */
2332 ASSERT(mp
->lid
== lid
);
2335 assert(mp
->nohomeok
== 1);
2336 metapage_homeok(mp
);
2337 discard_metapage(mp
);
2342 * update inode allocation map
2344 * update allocation state in pmap and
2345 * update lsn of the pmap page;
2346 * update in-memory inode flag/state
2348 * unlock mapper/write lock
2350 if (tblk
->xflag
& COMMIT_CREATE
) {
2351 diUpdatePMap(ipimap
, tblk
->ino
, false, tblk
);
2352 /* update persistent block allocation map
2353 * for the allocation of inode extent;
2355 pxdlock
.flag
= mlckALLOCPXD
;
2356 pxdlock
.pxd
= tblk
->u
.ixpxd
;
2358 txAllocPMap(ipimap
, (struct maplock
*) & pxdlock
, tblk
);
2359 } else if (tblk
->xflag
& COMMIT_DELETE
) {
2361 diUpdatePMap(ipimap
, ip
->i_ino
, true, tblk
);
2369 * function: allocate from persistent map;
2378 * allocate from persistent map;
2379 * free from persistent map;
2380 * (e.g., tmp file - free from working map at releae
2381 * of last reference);
2382 * free from persistent and working map;
2384 * lsn - log sequence number;
2386 static void txAllocPMap(struct inode
*ip
, struct maplock
* maplock
,
2387 struct tblock
* tblk
)
2389 struct inode
*ipbmap
= JFS_SBI(ip
->i_sb
)->ipbmap
;
2390 struct xdlistlock
*xadlistlock
;
2394 struct pxd_lock
*pxdlock
;
2395 struct xdlistlock
*pxdlistlock
;
2400 * allocate from persistent map;
2402 if (maplock
->flag
& mlckALLOCXADLIST
) {
2403 xadlistlock
= (struct xdlistlock
*) maplock
;
2404 xad
= xadlistlock
->xdlist
;
2405 for (n
= 0; n
< xadlistlock
->count
; n
++, xad
++) {
2406 if (xad
->flag
& (XAD_NEW
| XAD_EXTENDED
)) {
2407 xaddr
= addressXAD(xad
);
2408 xlen
= lengthXAD(xad
);
2409 dbUpdatePMap(ipbmap
, false, xaddr
,
2411 xad
->flag
&= ~(XAD_NEW
| XAD_EXTENDED
);
2412 jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2413 (ulong
) xaddr
, xlen
);
2416 } else if (maplock
->flag
& mlckALLOCPXD
) {
2417 pxdlock
= (struct pxd_lock
*) maplock
;
2418 xaddr
= addressPXD(&pxdlock
->pxd
);
2419 xlen
= lengthPXD(&pxdlock
->pxd
);
2420 dbUpdatePMap(ipbmap
, false, xaddr
, (s64
) xlen
, tblk
);
2421 jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong
) xaddr
, xlen
);
2422 } else { /* (maplock->flag & mlckALLOCPXDLIST) */
2424 pxdlistlock
= (struct xdlistlock
*) maplock
;
2425 pxd
= pxdlistlock
->xdlist
;
2426 for (n
= 0; n
< pxdlistlock
->count
; n
++, pxd
++) {
2427 xaddr
= addressPXD(pxd
);
2428 xlen
= lengthPXD(pxd
);
2429 dbUpdatePMap(ipbmap
, false, xaddr
, (s64
) xlen
,
2431 jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2432 (ulong
) xaddr
, xlen
);
2440 * function: free from persistent and/or working map;
2442 * todo: optimization
2444 void txFreeMap(struct inode
*ip
,
2445 struct maplock
* maplock
, struct tblock
* tblk
, int maptype
)
2447 struct inode
*ipbmap
= JFS_SBI(ip
->i_sb
)->ipbmap
;
2448 struct xdlistlock
*xadlistlock
;
2452 struct pxd_lock
*pxdlock
;
2453 struct xdlistlock
*pxdlistlock
;
2457 jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
2458 tblk
, maplock
, maptype
);
2461 * free from persistent map;
2463 if (maptype
== COMMIT_PMAP
|| maptype
== COMMIT_PWMAP
) {
2464 if (maplock
->flag
& mlckFREEXADLIST
) {
2465 xadlistlock
= (struct xdlistlock
*) maplock
;
2466 xad
= xadlistlock
->xdlist
;
2467 for (n
= 0; n
< xadlistlock
->count
; n
++, xad
++) {
2468 if (!(xad
->flag
& XAD_NEW
)) {
2469 xaddr
= addressXAD(xad
);
2470 xlen
= lengthXAD(xad
);
2471 dbUpdatePMap(ipbmap
, true, xaddr
,
2473 jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2474 (ulong
) xaddr
, xlen
);
2477 } else if (maplock
->flag
& mlckFREEPXD
) {
2478 pxdlock
= (struct pxd_lock
*) maplock
;
2479 xaddr
= addressPXD(&pxdlock
->pxd
);
2480 xlen
= lengthPXD(&pxdlock
->pxd
);
2481 dbUpdatePMap(ipbmap
, true, xaddr
, (s64
) xlen
,
2483 jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2484 (ulong
) xaddr
, xlen
);
2485 } else { /* (maplock->flag & mlckALLOCPXDLIST) */
2487 pxdlistlock
= (struct xdlistlock
*) maplock
;
2488 pxd
= pxdlistlock
->xdlist
;
2489 for (n
= 0; n
< pxdlistlock
->count
; n
++, pxd
++) {
2490 xaddr
= addressPXD(pxd
);
2491 xlen
= lengthPXD(pxd
);
2492 dbUpdatePMap(ipbmap
, true, xaddr
,
2494 jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2495 (ulong
) xaddr
, xlen
);
2501 * free from working map;
2503 if (maptype
== COMMIT_PWMAP
|| maptype
== COMMIT_WMAP
) {
2504 if (maplock
->flag
& mlckFREEXADLIST
) {
2505 xadlistlock
= (struct xdlistlock
*) maplock
;
2506 xad
= xadlistlock
->xdlist
;
2507 for (n
= 0; n
< xadlistlock
->count
; n
++, xad
++) {
2508 xaddr
= addressXAD(xad
);
2509 xlen
= lengthXAD(xad
);
2510 dbFree(ip
, xaddr
, (s64
) xlen
);
2512 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2513 (ulong
) xaddr
, xlen
);
2515 } else if (maplock
->flag
& mlckFREEPXD
) {
2516 pxdlock
= (struct pxd_lock
*) maplock
;
2517 xaddr
= addressPXD(&pxdlock
->pxd
);
2518 xlen
= lengthPXD(&pxdlock
->pxd
);
2519 dbFree(ip
, xaddr
, (s64
) xlen
);
2520 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2521 (ulong
) xaddr
, xlen
);
2522 } else { /* (maplock->flag & mlckFREEPXDLIST) */
2524 pxdlistlock
= (struct xdlistlock
*) maplock
;
2525 pxd
= pxdlistlock
->xdlist
;
2526 for (n
= 0; n
< pxdlistlock
->count
; n
++, pxd
++) {
2527 xaddr
= addressPXD(pxd
);
2528 xlen
= lengthPXD(pxd
);
2529 dbFree(ip
, xaddr
, (s64
) xlen
);
2530 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2531 (ulong
) xaddr
, xlen
);
2540 * function: remove tlock from inode anonymous locklist
2542 void txFreelock(struct inode
*ip
)
2544 struct jfs_inode_info
*jfs_ip
= JFS_IP(ip
);
2545 struct tlock
*xtlck
, *tlck
;
2546 lid_t xlid
= 0, lid
;
2548 if (!jfs_ip
->atlhead
)
2552 xtlck
= (struct tlock
*) &jfs_ip
->atlhead
;
2554 while ((lid
= xtlck
->next
) != 0) {
2555 tlck
= lid_to_tlock(lid
);
2556 if (tlck
->flag
& tlckFREELOCK
) {
2557 xtlck
->next
= tlck
->next
;
2565 if (jfs_ip
->atlhead
)
2566 jfs_ip
->atltail
= xlid
;
2568 jfs_ip
->atltail
= 0;
2570 * If inode was on anon_list, remove it
2572 list_del_init(&jfs_ip
->anon_inode_list
);
2580 * function: abort tx before commit;
2582 * frees line-locks and segment locks for all
2583 * segments in comdata structure.
2584 * Optionally sets state of file-system to FM_DIRTY in super-block.
2585 * log age of page-frames in memory for which caller has
2586 * are reset to 0 (to avoid logwarap).
2588 void txAbort(tid_t tid
, int dirty
)
2591 struct metapage
*mp
;
2592 struct tblock
*tblk
= tid_to_tblock(tid
);
2596 * free tlocks of the transaction
2598 for (lid
= tblk
->next
; lid
; lid
= next
) {
2599 tlck
= lid_to_tlock(lid
);
2602 JFS_IP(tlck
->ip
)->xtlid
= 0;
2608 * reset lsn of page to avoid logwarap:
2610 * (page may have been previously committed by another
2611 * transaction(s) but has not been paged, i.e.,
2612 * it may be on logsync list even though it has not
2613 * been logged for the current tx.)
2615 if (mp
->xflag
& COMMIT_PAGE
&& mp
->lsn
)
2618 /* insert tlock at head of freelist */
2624 /* caller will free the transaction block */
2626 tblk
->next
= tblk
->last
= 0;
2629 * mark filesystem dirty
2632 jfs_error(tblk
->sb
, "\n");
2638 * txLazyCommit(void)
2640 * All transactions except those changing ipimap (COMMIT_FORCE) are
2641 * processed by this routine. This insures that the inode and block
2642 * allocation maps are updated in order. For synchronous transactions,
2643 * let the user thread finish processing after txUpdateMap() is called.
2645 static void txLazyCommit(struct tblock
* tblk
)
2647 struct jfs_log
*log
;
2649 while (((tblk
->flag
& tblkGC_READY
) == 0) &&
2650 ((tblk
->flag
& tblkGC_UNLOCKED
) == 0)) {
2651 /* We must have gotten ahead of the user thread
2653 jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk
);
2657 jfs_info("txLazyCommit: processing tblk 0x%p", tblk
);
2661 log
= (struct jfs_log
*) JFS_SBI(tblk
->sb
)->log
;
2663 spin_lock_irq(&log
->gclock
); // LOGGC_LOCK
2665 tblk
->flag
|= tblkGC_COMMITTED
;
2667 if (tblk
->flag
& tblkGC_READY
)
2670 wake_up_all(&tblk
->gcwait
); // LOGGC_WAKEUP
2673 * Can't release log->gclock until we've tested tblk->flag
2675 if (tblk
->flag
& tblkGC_LAZY
) {
2676 spin_unlock_irq(&log
->gclock
); // LOGGC_UNLOCK
2678 tblk
->flag
&= ~tblkGC_LAZY
;
2679 txEnd(tblk
- TxBlock
); /* Convert back to tid */
2681 spin_unlock_irq(&log
->gclock
); // LOGGC_UNLOCK
2683 jfs_info("txLazyCommit: done: tblk = 0x%p", tblk
);
2687 * jfs_lazycommit(void)
2689 * To be run as a kernel daemon. If lbmIODone is called in an interrupt
2690 * context, or where blocking is not wanted, this routine will process
2691 * committed transactions from the unlock queue.
2693 int jfs_lazycommit(void *arg
)
2696 struct tblock
*tblk
;
2697 unsigned long flags
;
2698 struct jfs_sb_info
*sbi
;
2702 jfs_commit_thread_waking
= 0; /* OK to wake another thread */
2703 while (!list_empty(&TxAnchor
.unlock_queue
)) {
2705 list_for_each_entry(tblk
, &TxAnchor
.unlock_queue
,
2708 sbi
= JFS_SBI(tblk
->sb
);
2710 * For each volume, the transactions must be
2711 * handled in order. If another commit thread
2712 * is handling a tblk for this superblock,
2715 if (sbi
->commit_state
& IN_LAZYCOMMIT
)
2718 sbi
->commit_state
|= IN_LAZYCOMMIT
;
2722 * Remove transaction from queue
2724 list_del(&tblk
->cqueue
);
2730 sbi
->commit_state
&= ~IN_LAZYCOMMIT
;
2732 * Don't continue in the for loop. (We can't
2733 * anyway, it's unsafe!) We want to go back to
2734 * the beginning of the list.
2739 /* If there was nothing to do, don't continue */
2743 /* In case a wakeup came while all threads were active */
2744 jfs_commit_thread_waking
= 0;
2746 if (freezing(current
)) {
2750 DECLARE_WAITQUEUE(wq
, current
);
2752 add_wait_queue(&jfs_commit_thread_wait
, &wq
);
2753 set_current_state(TASK_INTERRUPTIBLE
);
2756 remove_wait_queue(&jfs_commit_thread_wait
, &wq
);
2758 } while (!kthread_should_stop());
2760 if (!list_empty(&TxAnchor
.unlock_queue
))
2761 jfs_err("jfs_lazycommit being killed w/pending transactions!");
2763 jfs_info("jfs_lazycommit being killed");
2767 void txLazyUnlock(struct tblock
* tblk
)
2769 unsigned long flags
;
2773 list_add_tail(&tblk
->cqueue
, &TxAnchor
.unlock_queue
);
2775 * Don't wake up a commit thread if there is already one servicing
2776 * this superblock, or if the last one we woke up hasn't started yet.
2778 if (!(JFS_SBI(tblk
->sb
)->commit_state
& IN_LAZYCOMMIT
) &&
2779 !jfs_commit_thread_waking
) {
2780 jfs_commit_thread_waking
= 1;
2781 wake_up(&jfs_commit_thread_wait
);
2786 static void LogSyncRelease(struct metapage
* mp
)
2788 struct jfs_log
*log
= mp
->log
;
2790 assert(mp
->nohomeok
);
2792 metapage_homeok(mp
);
2798 * Block all new transactions and push anonymous transactions to
2801 * This does almost the same thing as jfs_sync below. We don't
2802 * worry about deadlocking when jfs_tlocks_low is set, since we would
2803 * expect jfs_sync to get us out of that jam.
2805 void txQuiesce(struct super_block
*sb
)
2808 struct jfs_inode_info
*jfs_ip
;
2809 struct jfs_log
*log
= JFS_SBI(sb
)->log
;
2812 set_bit(log_QUIESCE
, &log
->flag
);
2816 while (!list_empty(&TxAnchor
.anon_list
)) {
2817 jfs_ip
= list_entry(TxAnchor
.anon_list
.next
,
2818 struct jfs_inode_info
,
2820 ip
= &jfs_ip
->vfs_inode
;
2823 * inode will be removed from anonymous list
2824 * when it is committed
2827 tid
= txBegin(ip
->i_sb
, COMMIT_INODE
| COMMIT_FORCE
);
2828 mutex_lock(&jfs_ip
->commit_mutex
);
2829 txCommit(tid
, 1, &ip
, 0);
2831 mutex_unlock(&jfs_ip
->commit_mutex
);
2833 * Just to be safe. I don't know how
2834 * long we can run without blocking
2841 * If jfs_sync is running in parallel, there could be some inodes
2842 * on anon_list2. Let's check.
2844 if (!list_empty(&TxAnchor
.anon_list2
)) {
2845 list_splice_init(&TxAnchor
.anon_list2
, &TxAnchor
.anon_list
);
2851 * We may need to kick off the group commit
2853 jfs_flush_journal(log
, 0);
2859 * Allows transactions to start again following txQuiesce
2861 void txResume(struct super_block
*sb
)
2863 struct jfs_log
*log
= JFS_SBI(sb
)->log
;
2865 clear_bit(log_QUIESCE
, &log
->flag
);
2866 TXN_WAKEUP(&log
->syncwait
);
2872 * To be run as a kernel daemon. This is awakened when tlocks run low.
2873 * We write any inodes that have anonymous tlocks so they will become
2876 int jfs_sync(void *arg
)
2879 struct jfs_inode_info
*jfs_ip
;
2884 * write each inode on the anonymous inode list
2887 while (jfs_tlocks_low
&& !list_empty(&TxAnchor
.anon_list
)) {
2888 jfs_ip
= list_entry(TxAnchor
.anon_list
.next
,
2889 struct jfs_inode_info
,
2891 ip
= &jfs_ip
->vfs_inode
;
2895 * Inode is being freed
2897 list_del_init(&jfs_ip
->anon_inode_list
);
2898 } else if (mutex_trylock(&jfs_ip
->commit_mutex
)) {
2900 * inode will be removed from anonymous list
2901 * when it is committed
2904 tid
= txBegin(ip
->i_sb
, COMMIT_INODE
);
2905 txCommit(tid
, 1, &ip
, 0);
2907 mutex_unlock(&jfs_ip
->commit_mutex
);
2911 * Just to be safe. I don't know how
2912 * long we can run without blocking
2917 /* We can't get the commit mutex. It may
2918 * be held by a thread waiting for tlock's
2919 * so let's not block here. Save it to
2920 * put back on the anon_list.
2923 /* Move from anon_list to anon_list2 */
2924 list_move(&jfs_ip
->anon_inode_list
,
2925 &TxAnchor
.anon_list2
);
2932 /* Add anon_list2 back to anon_list */
2933 list_splice_init(&TxAnchor
.anon_list2
, &TxAnchor
.anon_list
);
2935 if (freezing(current
)) {
2939 set_current_state(TASK_INTERRUPTIBLE
);
2943 } while (!kthread_should_stop());
2945 jfs_info("jfs_sync being killed");
2949 #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
2950 int jfs_txanchor_proc_show(struct seq_file
*m
, void *v
)
2957 waitqueue_active(&TxAnchor
.freewait
) ? "active" : "empty";
2959 waitqueue_active(&TxAnchor
.freelockwait
) ? "active" : "empty";
2961 waitqueue_active(&TxAnchor
.lowlockwait
) ? "active" : "empty";
2969 "freelockwait = %s\n"
2970 "lowlockwait = %s\n"
2971 "tlocksInUse = %d\n"
2972 "jfs_tlocks_low = %d\n"
2973 "unlock_queue is %sempty\n",
2979 TxAnchor
.tlocksInUse
,
2981 list_empty(&TxAnchor
.unlock_queue
) ? "" : "not ");
2986 #if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
2987 int jfs_txstats_proc_show(struct seq_file
*m
, void *v
)
2992 "calls to txBegin = %d\n"
2993 "txBegin blocked by sync barrier = %d\n"
2994 "txBegin blocked by tlocks low = %d\n"
2995 "txBegin blocked by no free tid = %d\n"
2996 "calls to txBeginAnon = %d\n"
2997 "txBeginAnon blocked by sync barrier = %d\n"
2998 "txBeginAnon blocked by tlocks low = %d\n"
2999 "calls to txLockAlloc = %d\n"
3000 "tLockAlloc blocked by no free lock = %d\n",
3002 TxStat
.txBegin_barrier
,
3003 TxStat
.txBegin_lockslow
,
3004 TxStat
.txBegin_freetid
,
3006 TxStat
.txBeginAnon_barrier
,
3007 TxStat
.txBeginAnon_lockslow
,
3009 TxStat
.txLockAlloc_freelock
);