blob: f2dc4b9863926e7c9f17ec39164d83cdceab9749 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) International Business Machines Corp., 2000-2005
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -050021 * jfs_txnmgr.c: transaction manager
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 *
23 * notes:
24 * transaction starts with txBegin() and ends with txCommit()
25 * or txAbort().
26 *
27 * tlock is acquired at the time of update;
28 * (obviate scan at commit time for xtree and dtree)
29 * tlock and mp points to each other;
30 * (no hashlist for mp -> tlock).
31 *
32 * special cases:
33 * tlock on in-memory inode:
34 * in-place tlock in the in-memory inode itself;
35 * converted to page lock by iWrite() at commit time.
36 *
37 * tlock during write()/mmap() under anonymous transaction (tid = 0):
38 * transferred (?) to transaction at commit time.
39 *
40 * use the page itself to update allocation maps
41 * (obviate intermediate replication of allocation/deallocation data)
42 * hold on to mp+lock thru update of maps
43 */
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/fs.h>
46#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/completion.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080048#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/module.h>
50#include <linux/moduleparam.h>
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -060051#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include "jfs_incore.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050053#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include "jfs_filsys.h"
55#include "jfs_metapage.h"
56#include "jfs_dinode.h"
57#include "jfs_imap.h"
58#include "jfs_dmap.h"
59#include "jfs_superblock.h"
60#include "jfs_debug.h"
61
62/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -050063 * transaction management structures
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 */
65static struct {
66 int freetid; /* index of a free tid structure */
67 int freelock; /* index first free lock word */
68 wait_queue_head_t freewait; /* eventlist of free tblock */
69 wait_queue_head_t freelockwait; /* eventlist of free tlock */
70 wait_queue_head_t lowlockwait; /* eventlist of ample tlocks */
71 int tlocksInUse; /* Number of tlocks in use */
72 spinlock_t LazyLock; /* synchronize sync_queue & unlock_queue */
73/* struct tblock *sync_queue; * Transactions waiting for data sync */
74 struct list_head unlock_queue; /* Txns waiting to be released */
75 struct list_head anon_list; /* inodes having anonymous txns */
76 struct list_head anon_list2; /* inodes having anonymous txns
77 that couldn't be sync'ed */
78} TxAnchor;
79
80int jfs_tlocks_low; /* Indicates low number of available tlocks */
81
82#ifdef CONFIG_JFS_STATISTICS
83static struct {
84 uint txBegin;
85 uint txBegin_barrier;
86 uint txBegin_lockslow;
87 uint txBegin_freetid;
88 uint txBeginAnon;
89 uint txBeginAnon_barrier;
90 uint txBeginAnon_lockslow;
91 uint txLockAlloc;
92 uint txLockAlloc_freelock;
93} TxStat;
94#endif
95
96static int nTxBlock = -1; /* number of transaction blocks */
97module_param(nTxBlock, int, 0);
98MODULE_PARM_DESC(nTxBlock,
99 "Number of transaction blocks (max:65536)");
100
101static int nTxLock = -1; /* number of transaction locks */
102module_param(nTxLock, int, 0);
103MODULE_PARM_DESC(nTxLock,
104 "Number of transaction locks (max:65536)");
105
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500106struct tblock *TxBlock; /* transaction block table */
107static int TxLockLWM; /* Low water mark for number of txLocks used */
108static int TxLockHWM; /* High water mark for number of txLocks used */
109static int TxLockVHWM; /* Very High water mark */
110struct tlock *TxLock; /* transaction lock table */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500113 * transaction management lock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 */
115static DEFINE_SPINLOCK(jfsTxnLock);
116
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500117#define TXN_LOCK() spin_lock(&jfsTxnLock)
118#define TXN_UNLOCK() spin_unlock(&jfsTxnLock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120#define LAZY_LOCK_INIT() spin_lock_init(&TxAnchor.LazyLock);
121#define LAZY_LOCK(flags) spin_lock_irqsave(&TxAnchor.LazyLock, flags)
122#define LAZY_UNLOCK(flags) spin_unlock_irqrestore(&TxAnchor.LazyLock, flags)
123
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600124static DECLARE_WAIT_QUEUE_HEAD(jfs_commit_thread_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125static int jfs_commit_thread_waking;
126
127/*
128 * Retry logic exist outside these macros to protect from spurrious wakeups.
129 */
130static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
131{
132 DECLARE_WAITQUEUE(wait, current);
133
134 add_wait_queue(event, &wait);
135 set_current_state(TASK_UNINTERRUPTIBLE);
136 TXN_UNLOCK();
Dave Kleikamp4aa0d232007-01-17 21:18:35 -0600137 io_schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -0500138 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 remove_wait_queue(event, &wait);
140}
141
142#define TXN_SLEEP(event)\
143{\
144 TXN_SLEEP_DROP_LOCK(event);\
145 TXN_LOCK();\
146}
147
148#define TXN_WAKEUP(event) wake_up_all(event)
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500151 * statistics
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 */
153static struct {
154 tid_t maxtid; /* 4: biggest tid ever used */
155 lid_t maxlid; /* 4: biggest lid ever used */
156 int ntid; /* 4: # of transactions performed */
157 int nlid; /* 4: # of tlocks acquired */
158 int waitlock; /* 4: # of tlock wait */
159} stattx;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161/*
162 * forward references
163 */
164static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
165 struct tlock * tlck, struct commit * cd);
166static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
167 struct tlock * tlck);
168static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
169 struct tlock * tlck);
170static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
171 struct tlock * tlck);
172static void txAllocPMap(struct inode *ip, struct maplock * maplock,
173 struct tblock * tblk);
174static void txForce(struct tblock * tblk);
175static int txLog(struct jfs_log * log, struct tblock * tblk,
176 struct commit * cd);
177static void txUpdateMap(struct tblock * tblk);
178static void txRelease(struct tblock * tblk);
179static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
180 struct tlock * tlck);
181static void LogSyncRelease(struct metapage * mp);
182
183/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500184 * transaction block/lock management
185 * ---------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 */
187
188/*
189 * Get a transaction lock from the free list. If the number in use is
190 * greater than the high water mark, wake up the sync daemon. This should
191 * free some anonymous transaction locks. (TXN_LOCK must be held.)
192 */
193static lid_t txLockAlloc(void)
194{
195 lid_t lid;
196
197 INCREMENT(TxStat.txLockAlloc);
198 if (!TxAnchor.freelock) {
199 INCREMENT(TxStat.txLockAlloc_freelock);
200 }
201
202 while (!(lid = TxAnchor.freelock))
203 TXN_SLEEP(&TxAnchor.freelockwait);
204 TxAnchor.freelock = TxLock[lid].next;
205 HIGHWATERMARK(stattx.maxlid, lid);
206 if ((++TxAnchor.tlocksInUse > TxLockHWM) && (jfs_tlocks_low == 0)) {
207 jfs_info("txLockAlloc tlocks low");
208 jfs_tlocks_low = 1;
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -0600209 wake_up_process(jfsSyncThread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211
212 return lid;
213}
214
215static void txLockFree(lid_t lid)
216{
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600217 TxLock[lid].tid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 TxLock[lid].next = TxAnchor.freelock;
219 TxAnchor.freelock = lid;
220 TxAnchor.tlocksInUse--;
221 if (jfs_tlocks_low && (TxAnchor.tlocksInUse < TxLockLWM)) {
222 jfs_info("txLockFree jfs_tlocks_low no more");
223 jfs_tlocks_low = 0;
224 TXN_WAKEUP(&TxAnchor.lowlockwait);
225 }
226 TXN_WAKEUP(&TxAnchor.freelockwait);
227}
228
229/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500230 * NAME: txInit()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500232 * FUNCTION: initialize transaction management structures
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 *
234 * RETURN:
235 *
236 * serialization: single thread at jfs_init()
237 */
238int txInit(void)
239{
240 int k, size;
241 struct sysinfo si;
242
243 /* Set defaults for nTxLock and nTxBlock if unset */
244
245 if (nTxLock == -1) {
246 if (nTxBlock == -1) {
247 /* Base default on memory size */
248 si_meminfo(&si);
249 if (si.totalram > (256 * 1024)) /* 1 GB */
250 nTxLock = 64 * 1024;
251 else
252 nTxLock = si.totalram >> 2;
253 } else if (nTxBlock > (8 * 1024))
254 nTxLock = 64 * 1024;
255 else
256 nTxLock = nTxBlock << 3;
257 }
258 if (nTxBlock == -1)
259 nTxBlock = nTxLock >> 3;
260
261 /* Verify tunable parameters */
262 if (nTxBlock < 16)
263 nTxBlock = 16; /* No one should set it this low */
264 if (nTxBlock > 65536)
265 nTxBlock = 65536;
266 if (nTxLock < 256)
267 nTxLock = 256; /* No one should set it this low */
268 if (nTxLock > 65536)
269 nTxLock = 65536;
270
271 printk(KERN_INFO "JFS: nTxBlock = %d, nTxLock = %d\n",
272 nTxBlock, nTxLock);
273 /*
274 * initialize transaction block (tblock) table
275 *
276 * transaction id (tid) = tblock index
277 * tid = 0 is reserved.
278 */
279 TxLockLWM = (nTxLock * 4) / 10;
280 TxLockHWM = (nTxLock * 7) / 10;
281 TxLockVHWM = (nTxLock * 8) / 10;
282
283 size = sizeof(struct tblock) * nTxBlock;
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700284 TxBlock = vmalloc(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 if (TxBlock == NULL)
286 return -ENOMEM;
287
288 for (k = 1; k < nTxBlock - 1; k++) {
289 TxBlock[k].next = k + 1;
290 init_waitqueue_head(&TxBlock[k].gcwait);
291 init_waitqueue_head(&TxBlock[k].waitor);
292 }
293 TxBlock[k].next = 0;
294 init_waitqueue_head(&TxBlock[k].gcwait);
295 init_waitqueue_head(&TxBlock[k].waitor);
296
297 TxAnchor.freetid = 1;
298 init_waitqueue_head(&TxAnchor.freewait);
299
300 stattx.maxtid = 1; /* statistics */
301
302 /*
303 * initialize transaction lock (tlock) table
304 *
305 * transaction lock id = tlock index
306 * tlock id = 0 is reserved.
307 */
308 size = sizeof(struct tlock) * nTxLock;
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700309 TxLock = vmalloc(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (TxLock == NULL) {
311 vfree(TxBlock);
312 return -ENOMEM;
313 }
314
315 /* initialize tlock table */
316 for (k = 1; k < nTxLock - 1; k++)
317 TxLock[k].next = k + 1;
318 TxLock[k].next = 0;
319 init_waitqueue_head(&TxAnchor.freelockwait);
320 init_waitqueue_head(&TxAnchor.lowlockwait);
321
322 TxAnchor.freelock = 1;
323 TxAnchor.tlocksInUse = 0;
324 INIT_LIST_HEAD(&TxAnchor.anon_list);
325 INIT_LIST_HEAD(&TxAnchor.anon_list2);
326
327 LAZY_LOCK_INIT();
328 INIT_LIST_HEAD(&TxAnchor.unlock_queue);
329
330 stattx.maxlid = 1; /* statistics */
331
332 return 0;
333}
334
335/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500336 * NAME: txExit()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500338 * FUNCTION: clean up when module is unloaded
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 */
340void txExit(void)
341{
342 vfree(TxLock);
343 TxLock = NULL;
344 vfree(TxBlock);
345 TxBlock = NULL;
346}
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500349 * NAME: txBegin()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500351 * FUNCTION: start a transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500353 * PARAMETER: sb - superblock
354 * flag - force for nested tx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 *
356 * RETURN: tid - transaction id
357 *
358 * note: flag force allows to start tx for nested tx
359 * to prevent deadlock on logsync barrier;
360 */
361tid_t txBegin(struct super_block *sb, int flag)
362{
363 tid_t t;
364 struct tblock *tblk;
365 struct jfs_log *log;
366
367 jfs_info("txBegin: flag = 0x%x", flag);
368 log = JFS_SBI(sb)->log;
369
370 TXN_LOCK();
371
372 INCREMENT(TxStat.txBegin);
373
374 retry:
375 if (!(flag & COMMIT_FORCE)) {
376 /*
377 * synchronize with logsync barrier
378 */
379 if (test_bit(log_SYNCBARRIER, &log->flag) ||
380 test_bit(log_QUIESCE, &log->flag)) {
381 INCREMENT(TxStat.txBegin_barrier);
382 TXN_SLEEP(&log->syncwait);
383 goto retry;
384 }
385 }
386 if (flag == 0) {
387 /*
388 * Don't begin transaction if we're getting starved for tlocks
389 * unless COMMIT_FORCE or COMMIT_INODE (which may ultimately
390 * free tlocks)
391 */
392 if (TxAnchor.tlocksInUse > TxLockVHWM) {
393 INCREMENT(TxStat.txBegin_lockslow);
394 TXN_SLEEP(&TxAnchor.lowlockwait);
395 goto retry;
396 }
397 }
398
399 /*
400 * allocate transaction id/block
401 */
402 if ((t = TxAnchor.freetid) == 0) {
403 jfs_info("txBegin: waiting for free tid");
404 INCREMENT(TxStat.txBegin_freetid);
405 TXN_SLEEP(&TxAnchor.freewait);
406 goto retry;
407 }
408
409 tblk = tid_to_tblock(t);
410
411 if ((tblk->next == 0) && !(flag & COMMIT_FORCE)) {
412 /* Don't let a non-forced transaction take the last tblk */
413 jfs_info("txBegin: waiting for free tid");
414 INCREMENT(TxStat.txBegin_freetid);
415 TXN_SLEEP(&TxAnchor.freewait);
416 goto retry;
417 }
418
419 TxAnchor.freetid = tblk->next;
420
421 /*
422 * initialize transaction
423 */
424
425 /*
426 * We can't zero the whole thing or we screw up another thread being
427 * awakened after sleeping on tblk->waitor
428 *
429 * memset(tblk, 0, sizeof(struct tblock));
430 */
431 tblk->next = tblk->last = tblk->xflag = tblk->flag = tblk->lsn = 0;
432
433 tblk->sb = sb;
434 ++log->logtid;
435 tblk->logtid = log->logtid;
436
437 ++log->active;
438
439 HIGHWATERMARK(stattx.maxtid, t); /* statistics */
440 INCREMENT(stattx.ntid); /* statistics */
441
442 TXN_UNLOCK();
443
444 jfs_info("txBegin: returning tid = %d", t);
445
446 return t;
447}
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500450 * NAME: txBeginAnon()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500452 * FUNCTION: start an anonymous transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 * Blocks if logsync or available tlocks are low to prevent
454 * anonymous tlocks from depleting supply.
455 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500456 * PARAMETER: sb - superblock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 *
458 * RETURN: none
459 */
460void txBeginAnon(struct super_block *sb)
461{
462 struct jfs_log *log;
463
464 log = JFS_SBI(sb)->log;
465
466 TXN_LOCK();
467 INCREMENT(TxStat.txBeginAnon);
468
469 retry:
470 /*
471 * synchronize with logsync barrier
472 */
473 if (test_bit(log_SYNCBARRIER, &log->flag) ||
474 test_bit(log_QUIESCE, &log->flag)) {
475 INCREMENT(TxStat.txBeginAnon_barrier);
476 TXN_SLEEP(&log->syncwait);
477 goto retry;
478 }
479
480 /*
481 * Don't begin transaction if we're getting starved for tlocks
482 */
483 if (TxAnchor.tlocksInUse > TxLockVHWM) {
484 INCREMENT(TxStat.txBeginAnon_lockslow);
485 TXN_SLEEP(&TxAnchor.lowlockwait);
486 goto retry;
487 }
488 TXN_UNLOCK();
489}
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500492 * txEnd()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 *
494 * function: free specified transaction block.
495 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500496 * logsync barrier processing:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 *
498 * serialization:
499 */
500void txEnd(tid_t tid)
501{
502 struct tblock *tblk = tid_to_tblock(tid);
503 struct jfs_log *log;
504
505 jfs_info("txEnd: tid = %d", tid);
506 TXN_LOCK();
507
508 /*
509 * wakeup transactions waiting on the page locked
510 * by the current transaction
511 */
512 TXN_WAKEUP(&tblk->waitor);
513
514 log = JFS_SBI(tblk->sb)->log;
515
516 /*
517 * Lazy commit thread can't free this guy until we mark it UNLOCKED,
518 * otherwise, we would be left with a transaction that may have been
519 * reused.
520 *
521 * Lazy commit thread will turn off tblkGC_LAZY before calling this
522 * routine.
523 */
524 if (tblk->flag & tblkGC_LAZY) {
525 jfs_info("txEnd called w/lazy tid: %d, tblk = 0x%p", tid, tblk);
526 TXN_UNLOCK();
527
528 spin_lock_irq(&log->gclock); // LOGGC_LOCK
529 tblk->flag |= tblkGC_UNLOCKED;
530 spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
531 return;
532 }
533
534 jfs_info("txEnd: tid: %d, tblk = 0x%p", tid, tblk);
535
536 assert(tblk->next == 0);
537
538 /*
539 * insert tblock back on freelist
540 */
541 tblk->next = TxAnchor.freetid;
542 TxAnchor.freetid = tid;
543
544 /*
545 * mark the tblock not active
546 */
547 if (--log->active == 0) {
548 clear_bit(log_FLUSH, &log->flag);
549
550 /*
551 * synchronize with logsync barrier
552 */
553 if (test_bit(log_SYNCBARRIER, &log->flag)) {
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500554 TXN_UNLOCK();
555
556 /* write dirty metadata & forward log syncpt */
557 jfs_syncpt(log, 1);
558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 jfs_info("log barrier off: 0x%x", log->lsn);
560
561 /* enable new transactions start */
562 clear_bit(log_SYNCBARRIER, &log->flag);
563
564 /* wakeup all waitors for logsync barrier */
565 TXN_WAKEUP(&log->syncwait);
Dave Kleikamp1c627822005-05-02 12:25:08 -0600566
Dave Kleikamp1c627822005-05-02 12:25:08 -0600567 goto wakeup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
569 }
570
Dave Kleikamp1c627822005-05-02 12:25:08 -0600571 TXN_UNLOCK();
572wakeup:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 /*
574 * wakeup all waitors for a free tblock
575 */
576 TXN_WAKEUP(&TxAnchor.freewait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577}
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500580 * txLock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 *
582 * function: acquire a transaction lock on the specified <mp>
583 *
584 * parameter:
585 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500586 * return: transaction lock id
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 *
588 * serialization:
589 */
590struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
591 int type)
592{
593 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
594 int dir_xtree = 0;
595 lid_t lid;
596 tid_t xtid;
597 struct tlock *tlck;
598 struct xtlock *xtlck;
599 struct linelock *linelock;
600 xtpage_t *p;
601 struct tblock *tblk;
602
603 TXN_LOCK();
604
605 if (S_ISDIR(ip->i_mode) && (type & tlckXTREE) &&
606 !(mp->xflag & COMMIT_PAGE)) {
607 /*
608 * Directory inode is special. It can have both an xtree tlock
609 * and a dtree tlock associated with it.
610 */
611 dir_xtree = 1;
612 lid = jfs_ip->xtlid;
613 } else
614 lid = mp->lid;
615
616 /* is page not locked by a transaction ? */
617 if (lid == 0)
618 goto allocateLock;
619
620 jfs_info("txLock: tid:%d ip:0x%p mp:0x%p lid:%d", tid, ip, mp, lid);
621
622 /* is page locked by the requester transaction ? */
623 tlck = lid_to_tlock(lid);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600624 if ((xtid = tlck->tid) == tid) {
625 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 goto grantLock;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600627 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 /*
630 * is page locked by anonymous transaction/lock ?
631 *
632 * (page update without transaction (i.e., file write) is
633 * locked under anonymous transaction tid = 0:
634 * anonymous tlocks maintained on anonymous tlock list of
635 * the inode of the page and available to all anonymous
636 * transactions until txCommit() time at which point
637 * they are transferred to the transaction tlock list of
638 * the commiting transaction of the inode)
639 */
640 if (xtid == 0) {
641 tlck->tid = tid;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600642 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 tblk = tid_to_tblock(tid);
644 /*
645 * The order of the tlocks in the transaction is important
646 * (during truncate, child xtree pages must be freed before
647 * parent's tlocks change the working map).
648 * Take tlock off anonymous list and add to tail of
649 * transaction list
650 *
651 * Note: We really need to get rid of the tid & lid and
652 * use list_head's. This code is getting UGLY!
653 */
654 if (jfs_ip->atlhead == lid) {
655 if (jfs_ip->atltail == lid) {
656 /* only anonymous txn.
657 * Remove from anon_list
658 */
Dave Kleikamp8a9cd6d2005-08-10 11:14:39 -0500659 TXN_LOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 list_del_init(&jfs_ip->anon_inode_list);
Dave Kleikamp8a9cd6d2005-08-10 11:14:39 -0500661 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
663 jfs_ip->atlhead = tlck->next;
664 } else {
665 lid_t last;
666 for (last = jfs_ip->atlhead;
667 lid_to_tlock(last)->next != lid;
668 last = lid_to_tlock(last)->next) {
669 assert(last);
670 }
671 lid_to_tlock(last)->next = tlck->next;
672 if (jfs_ip->atltail == lid)
673 jfs_ip->atltail = last;
674 }
675
676 /* insert the tlock at tail of transaction tlock list */
677
678 if (tblk->next)
679 lid_to_tlock(tblk->last)->next = lid;
680 else
681 tblk->next = lid;
682 tlck->next = 0;
683 tblk->last = lid;
684
685 goto grantLock;
686 }
687
688 goto waitLock;
689
690 /*
691 * allocate a tlock
692 */
693 allocateLock:
694 lid = txLockAlloc();
695 tlck = lid_to_tlock(lid);
696
697 /*
698 * initialize tlock
699 */
700 tlck->tid = tid;
701
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600702 TXN_UNLOCK();
703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 /* mark tlock for meta-data page */
705 if (mp->xflag & COMMIT_PAGE) {
706
707 tlck->flag = tlckPAGELOCK;
708
709 /* mark the page dirty and nohomeok */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600710 metapage_nohomeok(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 jfs_info("locking mp = 0x%p, nohomeok = %d tid = %d tlck = 0x%p",
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600713 mp, mp->nohomeok, tid, tlck);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 /* if anonymous transaction, and buffer is on the group
716 * commit synclist, mark inode to show this. This will
717 * prevent the buffer from being marked nohomeok for too
718 * long a time.
719 */
720 if ((tid == 0) && mp->lsn)
721 set_cflag(COMMIT_Synclist, ip);
722 }
723 /* mark tlock for in-memory inode */
724 else
725 tlck->flag = tlckINODELOCK;
726
Dave Kleikamp438282d2005-09-20 14:58:11 -0500727 if (S_ISDIR(ip->i_mode))
728 tlck->flag |= tlckDIRECTORY;
729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 tlck->type = 0;
731
732 /* bind the tlock and the page */
733 tlck->ip = ip;
734 tlck->mp = mp;
735 if (dir_xtree)
736 jfs_ip->xtlid = lid;
737 else
738 mp->lid = lid;
739
740 /*
741 * enqueue transaction lock to transaction/inode
742 */
743 /* insert the tlock at tail of transaction tlock list */
744 if (tid) {
745 tblk = tid_to_tblock(tid);
746 if (tblk->next)
747 lid_to_tlock(tblk->last)->next = lid;
748 else
749 tblk->next = lid;
750 tlck->next = 0;
751 tblk->last = lid;
752 }
753 /* anonymous transaction:
754 * insert the tlock at head of inode anonymous tlock list
755 */
756 else {
757 tlck->next = jfs_ip->atlhead;
758 jfs_ip->atlhead = lid;
759 if (tlck->next == 0) {
760 /* This inode's first anonymous transaction */
761 jfs_ip->atltail = lid;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600762 TXN_LOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 list_add_tail(&jfs_ip->anon_inode_list,
764 &TxAnchor.anon_list);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600765 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
767 }
768
769 /* initialize type dependent area for linelock */
770 linelock = (struct linelock *) & tlck->lock;
771 linelock->next = 0;
772 linelock->flag = tlckLINELOCK;
773 linelock->maxcnt = TLOCKSHORT;
774 linelock->index = 0;
775
776 switch (type & tlckTYPE) {
777 case tlckDTREE:
778 linelock->l2linesize = L2DTSLOTSIZE;
779 break;
780
781 case tlckXTREE:
782 linelock->l2linesize = L2XTSLOTSIZE;
783
784 xtlck = (struct xtlock *) linelock;
785 xtlck->header.offset = 0;
786 xtlck->header.length = 2;
787
788 if (type & tlckNEW) {
789 xtlck->lwm.offset = XTENTRYSTART;
790 } else {
791 if (mp->xflag & COMMIT_PAGE)
792 p = (xtpage_t *) mp->data;
793 else
794 p = &jfs_ip->i_xtroot;
795 xtlck->lwm.offset =
796 le16_to_cpu(p->header.nextindex);
797 }
798 xtlck->lwm.length = 0; /* ! */
799 xtlck->twm.offset = 0;
800 xtlck->hwm.offset = 0;
801
802 xtlck->index = 2;
803 break;
804
805 case tlckINODE:
806 linelock->l2linesize = L2INODESLOTSIZE;
807 break;
808
809 case tlckDATA:
810 linelock->l2linesize = L2DATASLOTSIZE;
811 break;
812
813 default:
814 jfs_err("UFO tlock:0x%p", tlck);
815 }
816
817 /*
818 * update tlock vector
819 */
820 grantLock:
821 tlck->type |= type;
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 return tlck;
824
825 /*
826 * page is being locked by another transaction:
827 */
828 waitLock:
829 /* Only locks on ipimap or ipaimap should reach here */
830 /* assert(jfs_ip->fileset == AGGREGATE_I); */
831 if (jfs_ip->fileset != AGGREGATE_I) {
832 jfs_err("txLock: trying to lock locked page!");
833 dump_mem("ip", ip, sizeof(struct inode));
834 dump_mem("mp", mp, sizeof(struct metapage));
835 dump_mem("Locker's tblk", tid_to_tblock(tid),
836 sizeof(struct tblock));
837 dump_mem("Tlock", tlck, sizeof(struct tlock));
838 BUG();
839 }
840 INCREMENT(stattx.waitlock); /* statistics */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600841 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 release_metapage(mp);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600843 TXN_LOCK();
Adrian Bunk04187262006-06-30 18:23:04 +0200844 xtid = tlck->tid; /* reacquire after dropping TXN_LOCK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
846 jfs_info("txLock: in waitLock, tid = %d, xtid = %d, lid = %d",
847 tid, xtid, lid);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600848
849 /* Recheck everything since dropping TXN_LOCK */
850 if (xtid && (tlck->mp == mp) && (mp->lid == lid))
851 TXN_SLEEP_DROP_LOCK(&tid_to_tblock(xtid)->waitor);
852 else
853 TXN_UNLOCK();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 jfs_info("txLock: awakened tid = %d, lid = %d", tid, lid);
855
856 return NULL;
857}
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500860 * NAME: txRelease()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500862 * FUNCTION: Release buffers associated with transaction locks, but don't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 * mark homeok yet. The allows other transactions to modify
864 * buffers, but won't let them go to disk until commit record
865 * actually gets written.
866 *
867 * PARAMETER:
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500868 * tblk -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500870 * RETURN: Errors from subroutines.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 */
872static void txRelease(struct tblock * tblk)
873{
874 struct metapage *mp;
875 lid_t lid;
876 struct tlock *tlck;
877
878 TXN_LOCK();
879
880 for (lid = tblk->next; lid; lid = tlck->next) {
881 tlck = lid_to_tlock(lid);
882 if ((mp = tlck->mp) != NULL &&
883 (tlck->type & tlckBTROOT) == 0) {
884 assert(mp->xflag & COMMIT_PAGE);
885 mp->lid = 0;
886 }
887 }
888
889 /*
890 * wakeup transactions waiting on a page locked
891 * by the current transaction
892 */
893 TXN_WAKEUP(&tblk->waitor);
894
895 TXN_UNLOCK();
896}
897
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500899 * NAME: txUnlock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500901 * FUNCTION: Initiates pageout of pages modified by tid in journalled
902 * objects and frees their lockwords.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 */
904static void txUnlock(struct tblock * tblk)
905{
906 struct tlock *tlck;
907 struct linelock *linelock;
908 lid_t lid, next, llid, k;
909 struct metapage *mp;
910 struct jfs_log *log;
911 int difft, diffp;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600912 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
914 jfs_info("txUnlock: tblk = 0x%p", tblk);
915 log = JFS_SBI(tblk->sb)->log;
916
917 /*
918 * mark page under tlock homeok (its log has been written):
919 */
920 for (lid = tblk->next; lid; lid = next) {
921 tlck = lid_to_tlock(lid);
922 next = tlck->next;
923
924 jfs_info("unlocking lid = %d, tlck = 0x%p", lid, tlck);
925
926 /* unbind page from tlock */
927 if ((mp = tlck->mp) != NULL &&
928 (tlck->type & tlckBTROOT) == 0) {
929 assert(mp->xflag & COMMIT_PAGE);
930
931 /* hold buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600933 hold_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600935 assert(mp->nohomeok > 0);
936 _metapage_homeok(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
938 /* inherit younger/larger clsn */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600939 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 if (mp->clsn) {
941 logdiff(difft, tblk->clsn, log);
942 logdiff(diffp, mp->clsn, log);
943 if (difft > diffp)
944 mp->clsn = tblk->clsn;
945 } else
946 mp->clsn = tblk->clsn;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600947 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
949 assert(!(tlck->flag & tlckFREEPAGE));
950
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600951 put_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 }
953
954 /* insert tlock, and linelock(s) of the tlock if any,
955 * at head of freelist
956 */
957 TXN_LOCK();
958
959 llid = ((struct linelock *) & tlck->lock)->next;
960 while (llid) {
961 linelock = (struct linelock *) lid_to_tlock(llid);
962 k = linelock->next;
963 txLockFree(llid);
964 llid = k;
965 }
966 txLockFree(lid);
967
968 TXN_UNLOCK();
969 }
970 tblk->next = tblk->last = 0;
971
972 /*
973 * remove tblock from logsynclist
974 * (allocation map pages inherited lsn of tblk and
975 * has been inserted in logsync list at txUpdateMap())
976 */
977 if (tblk->lsn) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600978 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 log->count--;
980 list_del(&tblk->synclist);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600981 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 }
983}
984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500986 * txMaplock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 *
988 * function: allocate a transaction lock for freed page/entry;
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500989 * for freed page, maplock is used as xtlock/dtlock type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 */
991struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
992{
993 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
994 lid_t lid;
995 struct tblock *tblk;
996 struct tlock *tlck;
997 struct maplock *maplock;
998
999 TXN_LOCK();
1000
1001 /*
1002 * allocate a tlock
1003 */
1004 lid = txLockAlloc();
1005 tlck = lid_to_tlock(lid);
1006
1007 /*
1008 * initialize tlock
1009 */
1010 tlck->tid = tid;
1011
1012 /* bind the tlock and the object */
1013 tlck->flag = tlckINODELOCK;
Dave Kleikamp438282d2005-09-20 14:58:11 -05001014 if (S_ISDIR(ip->i_mode))
1015 tlck->flag |= tlckDIRECTORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 tlck->ip = ip;
1017 tlck->mp = NULL;
1018
1019 tlck->type = type;
1020
1021 /*
1022 * enqueue transaction lock to transaction/inode
1023 */
1024 /* insert the tlock at tail of transaction tlock list */
1025 if (tid) {
1026 tblk = tid_to_tblock(tid);
1027 if (tblk->next)
1028 lid_to_tlock(tblk->last)->next = lid;
1029 else
1030 tblk->next = lid;
1031 tlck->next = 0;
1032 tblk->last = lid;
1033 }
1034 /* anonymous transaction:
1035 * insert the tlock at head of inode anonymous tlock list
1036 */
1037 else {
1038 tlck->next = jfs_ip->atlhead;
1039 jfs_ip->atlhead = lid;
1040 if (tlck->next == 0) {
1041 /* This inode's first anonymous transaction */
1042 jfs_ip->atltail = lid;
1043 list_add_tail(&jfs_ip->anon_inode_list,
1044 &TxAnchor.anon_list);
1045 }
1046 }
1047
1048 TXN_UNLOCK();
1049
1050 /* initialize type dependent area for maplock */
1051 maplock = (struct maplock *) & tlck->lock;
1052 maplock->next = 0;
1053 maplock->maxcnt = 0;
1054 maplock->index = 0;
1055
1056 return tlck;
1057}
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001060 * txLinelock()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 *
1062 * function: allocate a transaction lock for log vector list
1063 */
1064struct linelock *txLinelock(struct linelock * tlock)
1065{
1066 lid_t lid;
1067 struct tlock *tlck;
1068 struct linelock *linelock;
1069
1070 TXN_LOCK();
1071
1072 /* allocate a TxLock structure */
1073 lid = txLockAlloc();
1074 tlck = lid_to_tlock(lid);
1075
1076 TXN_UNLOCK();
1077
1078 /* initialize linelock */
1079 linelock = (struct linelock *) tlck;
1080 linelock->next = 0;
1081 linelock->flag = tlckLINELOCK;
1082 linelock->maxcnt = TLOCKLONG;
1083 linelock->index = 0;
Dave Kleikamp438282d2005-09-20 14:58:11 -05001084 if (tlck->flag & tlckDIRECTORY)
1085 linelock->flag |= tlckDIRECTORY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
1087 /* append linelock after tlock */
1088 linelock->next = tlock->next;
1089 tlock->next = lid;
1090
1091 return linelock;
1092}
1093
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001095 * transaction commit management
1096 * -----------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 */
1098
1099/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001100 * NAME: txCommit()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001102 * FUNCTION: commit the changes to the objects specified in
1103 * clist. For journalled segments only the
1104 * changes of the caller are committed, ie by tid.
1105 * for non-journalled segments the data are flushed to
1106 * disk and then the change to the disk inode and indirect
1107 * blocks committed (so blocks newly allocated to the
1108 * segment will be made a part of the segment atomically).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001110 * all of the segments specified in clist must be in
1111 * one file system. no more than 6 segments are needed
1112 * to handle all unix svcs.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001114 * if the i_nlink field (i.e. disk inode link count)
1115 * is zero, and the type of inode is a regular file or
1116 * directory, or symbolic link , the inode is truncated
1117 * to zero length. the truncation is committed but the
1118 * VM resources are unaffected until it is closed (see
1119 * iput and iclose).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 *
1121 * PARAMETER:
1122 *
1123 * RETURN:
1124 *
1125 * serialization:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001126 * on entry the inode lock on each segment is assumed
1127 * to be held.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 *
1129 * i/o error:
1130 */
1131int txCommit(tid_t tid, /* transaction identifier */
1132 int nip, /* number of inodes to commit */
1133 struct inode **iplist, /* list of inode to commit */
1134 int flag)
1135{
1136 int rc = 0;
1137 struct commit cd;
1138 struct jfs_log *log;
1139 struct tblock *tblk;
1140 struct lrd *lrd;
1141 int lsn;
1142 struct inode *ip;
1143 struct jfs_inode_info *jfs_ip;
1144 int k, n;
1145 ino_t top;
1146 struct super_block *sb;
1147
1148 jfs_info("txCommit, tid = %d, flag = %d", tid, flag);
1149 /* is read-only file system ? */
1150 if (isReadOnly(iplist[0])) {
1151 rc = -EROFS;
1152 goto TheEnd;
1153 }
1154
1155 sb = cd.sb = iplist[0]->i_sb;
1156 cd.tid = tid;
1157
1158 if (tid == 0)
1159 tid = txBegin(sb, 0);
1160 tblk = tid_to_tblock(tid);
1161
1162 /*
1163 * initialize commit structure
1164 */
1165 log = JFS_SBI(sb)->log;
1166 cd.log = log;
1167
1168 /* initialize log record descriptor in commit */
1169 lrd = &cd.lrd;
1170 lrd->logtid = cpu_to_le32(tblk->logtid);
1171 lrd->backchain = 0;
1172
1173 tblk->xflag |= flag;
1174
1175 if ((flag & (COMMIT_FORCE | COMMIT_SYNC)) == 0)
1176 tblk->xflag |= COMMIT_LAZY;
1177 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001178 * prepare non-journaled objects for commit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 *
1180 * flush data pages of non-journaled file
1181 * to prevent the file getting non-initialized disk blocks
1182 * in case of crash.
1183 * (new blocks - )
1184 */
1185 cd.iplist = iplist;
1186 cd.nip = nip;
1187
1188 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001189 * acquire transaction lock on (on-disk) inodes
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 *
1191 * update on-disk inode from in-memory inode
1192 * acquiring transaction locks for AFTER records
1193 * on the on-disk inode of file object
1194 *
1195 * sort the inodes array by inode number in descending order
1196 * to prevent deadlock when acquiring transaction lock
1197 * of on-disk inodes on multiple on-disk inode pages by
1198 * multiple concurrent transactions
1199 */
1200 for (k = 0; k < cd.nip; k++) {
1201 top = (cd.iplist[k])->i_ino;
1202 for (n = k + 1; n < cd.nip; n++) {
1203 ip = cd.iplist[n];
1204 if (ip->i_ino > top) {
1205 top = ip->i_ino;
1206 cd.iplist[n] = cd.iplist[k];
1207 cd.iplist[k] = ip;
1208 }
1209 }
1210
1211 ip = cd.iplist[k];
1212 jfs_ip = JFS_IP(ip);
1213
1214 /*
1215 * BUGBUG - This code has temporarily been removed. The
1216 * intent is to ensure that any file data is written before
1217 * the metadata is committed to the journal. This prevents
1218 * uninitialized data from appearing in a file after the
1219 * journal has been replayed. (The uninitialized data
1220 * could be sensitive data removed by another user.)
1221 *
1222 * The problem now is that we are holding the IWRITELOCK
1223 * on the inode, and calling filemap_fdatawrite on an
1224 * unmapped page will cause a deadlock in jfs_get_block.
1225 *
1226 * The long term solution is to pare down the use of
1227 * IWRITELOCK. We are currently holding it too long.
1228 * We could also be smarter about which data pages need
1229 * to be written before the transaction is committed and
1230 * when we don't need to worry about it at all.
1231 *
1232 * if ((!S_ISDIR(ip->i_mode))
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -08001233 * && (tblk->flag & COMMIT_DELETE) == 0)
1234 * filemap_write_and_wait(ip->i_mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 */
1236
1237 /*
1238 * Mark inode as not dirty. It will still be on the dirty
1239 * inode list, but we'll know not to commit it again unless
1240 * it gets marked dirty again
1241 */
1242 clear_cflag(COMMIT_Dirty, ip);
1243
1244 /* inherit anonymous tlock(s) of inode */
1245 if (jfs_ip->atlhead) {
1246 lid_to_tlock(jfs_ip->atltail)->next = tblk->next;
1247 tblk->next = jfs_ip->atlhead;
1248 if (!tblk->last)
1249 tblk->last = jfs_ip->atltail;
1250 jfs_ip->atlhead = jfs_ip->atltail = 0;
1251 TXN_LOCK();
1252 list_del_init(&jfs_ip->anon_inode_list);
1253 TXN_UNLOCK();
1254 }
1255
1256 /*
1257 * acquire transaction lock on on-disk inode page
1258 * (become first tlock of the tblk's tlock list)
1259 */
1260 if (((rc = diWrite(tid, ip))))
1261 goto out;
1262 }
1263
1264 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001265 * write log records from transaction locks
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 *
1267 * txUpdateMap() resets XAD_NEW in XAD.
1268 */
1269 if ((rc = txLog(log, tblk, &cd)))
1270 goto TheEnd;
1271
1272 /*
1273 * Ensure that inode isn't reused before
1274 * lazy commit thread finishes processing
1275 */
1276 if (tblk->xflag & COMMIT_DELETE) {
1277 atomic_inc(&tblk->u.ip->i_count);
1278 /*
1279 * Avoid a rare deadlock
1280 *
1281 * If the inode is locked, we may be blocked in
1282 * jfs_commit_inode. If so, we don't want the
1283 * lazy_commit thread doing the last iput() on the inode
1284 * since that may block on the locked inode. Instead,
1285 * commit the transaction synchronously, so the last iput
1286 * will be done by the calling thread (or later)
1287 */
1288 if (tblk->u.ip->i_state & I_LOCK)
1289 tblk->xflag &= ~COMMIT_LAZY;
1290 }
1291
1292 ASSERT((!(tblk->xflag & COMMIT_DELETE)) ||
1293 ((tblk->u.ip->i_nlink == 0) &&
1294 !test_cflag(COMMIT_Nolink, tblk->u.ip)));
1295
1296 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001297 * write COMMIT log record
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 */
1299 lrd->type = cpu_to_le16(LOG_COMMIT);
1300 lrd->length = 0;
1301 lsn = lmLog(log, tblk, lrd, NULL);
1302
1303 lmGroupCommit(log, tblk);
1304
1305 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001306 * - transaction is now committed -
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 */
1308
1309 /*
1310 * force pages in careful update
1311 * (imap addressing structure update)
1312 */
1313 if (flag & COMMIT_FORCE)
1314 txForce(tblk);
1315
1316 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001317 * update allocation map.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 *
1319 * update inode allocation map and inode:
1320 * free pager lock on memory object of inode if any.
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001321 * update block allocation map.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 *
1323 * txUpdateMap() resets XAD_NEW in XAD.
1324 */
1325 if (tblk->xflag & COMMIT_FORCE)
1326 txUpdateMap(tblk);
1327
1328 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001329 * free transaction locks and pageout/free pages
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 */
1331 txRelease(tblk);
1332
1333 if ((tblk->flag & tblkGC_LAZY) == 0)
1334 txUnlock(tblk);
1335
1336
1337 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001338 * reset in-memory object state
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 */
1340 for (k = 0; k < cd.nip; k++) {
1341 ip = cd.iplist[k];
1342 jfs_ip = JFS_IP(ip);
1343
1344 /*
1345 * reset in-memory inode state
1346 */
1347 jfs_ip->bxflag = 0;
1348 jfs_ip->blid = 0;
1349 }
1350
1351 out:
1352 if (rc != 0)
1353 txAbort(tid, 1);
1354
1355 TheEnd:
1356 jfs_info("txCommit: tid = %d, returning %d", tid, rc);
1357 return rc;
1358}
1359
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001361 * NAME: txLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001363 * FUNCTION: Writes AFTER log records for all lines modified
1364 * by tid for segments specified by inodes in comdata.
1365 * Code assumes only WRITELOCKS are recorded in lockwords.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 *
1367 * PARAMETERS:
1368 *
1369 * RETURN :
1370 */
1371static int txLog(struct jfs_log * log, struct tblock * tblk, struct commit * cd)
1372{
1373 int rc = 0;
1374 struct inode *ip;
1375 lid_t lid;
1376 struct tlock *tlck;
1377 struct lrd *lrd = &cd->lrd;
1378
1379 /*
1380 * write log record(s) for each tlock of transaction,
1381 */
1382 for (lid = tblk->next; lid; lid = tlck->next) {
1383 tlck = lid_to_tlock(lid);
1384
1385 tlck->flag |= tlckLOG;
1386
1387 /* initialize lrd common */
1388 ip = tlck->ip;
1389 lrd->aggregate = cpu_to_le32(JFS_SBI(ip->i_sb)->aggregate);
1390 lrd->log.redopage.fileset = cpu_to_le32(JFS_IP(ip)->fileset);
1391 lrd->log.redopage.inode = cpu_to_le32(ip->i_ino);
1392
1393 /* write log record of page from the tlock */
1394 switch (tlck->type & tlckTYPE) {
1395 case tlckXTREE:
1396 xtLog(log, tblk, lrd, tlck);
1397 break;
1398
1399 case tlckDTREE:
1400 dtLog(log, tblk, lrd, tlck);
1401 break;
1402
1403 case tlckINODE:
1404 diLog(log, tblk, lrd, tlck, cd);
1405 break;
1406
1407 case tlckMAP:
1408 mapLog(log, tblk, lrd, tlck);
1409 break;
1410
1411 case tlckDATA:
1412 dataLog(log, tblk, lrd, tlck);
1413 break;
1414
1415 default:
1416 jfs_err("UFO tlock:0x%p", tlck);
1417 }
1418 }
1419
1420 return rc;
1421}
1422
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001424 * diLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001426 * function: log inode tlock and format maplock to update bmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 */
1428static int diLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001429 struct tlock * tlck, struct commit * cd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430{
1431 int rc = 0;
1432 struct metapage *mp;
1433 pxd_t *pxd;
1434 struct pxd_lock *pxdlock;
1435
1436 mp = tlck->mp;
1437
1438 /* initialize as REDOPAGE record format */
1439 lrd->log.redopage.type = cpu_to_le16(LOG_INODE);
1440 lrd->log.redopage.l2linesize = cpu_to_le16(L2INODESLOTSIZE);
1441
1442 pxd = &lrd->log.redopage.pxd;
1443
1444 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001445 * inode after image
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 */
1447 if (tlck->type & tlckENTRY) {
1448 /* log after-image for logredo(): */
1449 lrd->type = cpu_to_le16(LOG_REDOPAGE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 PXDaddress(pxd, mp->index);
1451 PXDlength(pxd,
1452 mp->logical_size >> tblk->sb->s_blocksize_bits);
1453 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1454
1455 /* mark page as homeward bound */
1456 tlck->flag |= tlckWRITEPAGE;
1457 } else if (tlck->type & tlckFREE) {
1458 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001459 * free inode extent
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 *
1461 * (pages of the freed inode extent have been invalidated and
1462 * a maplock for free of the extent has been formatted at
1463 * txLock() time);
1464 *
1465 * the tlock had been acquired on the inode allocation map page
1466 * (iag) that specifies the freed extent, even though the map
1467 * page is not itself logged, to prevent pageout of the map
1468 * page before the log;
1469 */
1470
1471 /* log LOG_NOREDOINOEXT of the freed inode extent for
1472 * logredo() to start NoRedoPage filters, and to update
1473 * imap and bmap for free of the extent;
1474 */
1475 lrd->type = cpu_to_le16(LOG_NOREDOINOEXT);
1476 /*
1477 * For the LOG_NOREDOINOEXT record, we need
1478 * to pass the IAG number and inode extent
1479 * index (within that IAG) from which the
1480 * the extent being released. These have been
1481 * passed to us in the iplist[1] and iplist[2].
1482 */
1483 lrd->log.noredoinoext.iagnum =
1484 cpu_to_le32((u32) (size_t) cd->iplist[1]);
1485 lrd->log.noredoinoext.inoext_idx =
1486 cpu_to_le32((u32) (size_t) cd->iplist[2]);
1487
1488 pxdlock = (struct pxd_lock *) & tlck->lock;
1489 *pxd = pxdlock->pxd;
1490 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1491
1492 /* update bmap */
1493 tlck->flag |= tlckUPDATEMAP;
1494
1495 /* mark page as homeward bound */
1496 tlck->flag |= tlckWRITEPAGE;
1497 } else
1498 jfs_err("diLog: UFO type tlck:0x%p", tlck);
1499#ifdef _JFS_WIP
1500 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001501 * alloc/free external EA extent
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 *
1503 * a maplock for txUpdateMap() to update bPWMAP for alloc/free
1504 * of the extent has been formatted at txLock() time;
1505 */
1506 else {
1507 assert(tlck->type & tlckEA);
1508
1509 /* log LOG_UPDATEMAP for logredo() to update bmap for
1510 * alloc of new (and free of old) external EA extent;
1511 */
1512 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1513 pxdlock = (struct pxd_lock *) & tlck->lock;
1514 nlock = pxdlock->index;
1515 for (i = 0; i < nlock; i++, pxdlock++) {
1516 if (pxdlock->flag & mlckALLOCPXD)
1517 lrd->log.updatemap.type =
1518 cpu_to_le16(LOG_ALLOCPXD);
1519 else
1520 lrd->log.updatemap.type =
1521 cpu_to_le16(LOG_FREEPXD);
1522 lrd->log.updatemap.nxd = cpu_to_le16(1);
1523 lrd->log.updatemap.pxd = pxdlock->pxd;
1524 lrd->backchain =
1525 cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1526 }
1527
1528 /* update bmap */
1529 tlck->flag |= tlckUPDATEMAP;
1530 }
1531#endif /* _JFS_WIP */
1532
1533 return rc;
1534}
1535
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001537 * dataLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001539 * function: log data tlock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 */
1541static int dataLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1542 struct tlock * tlck)
1543{
1544 struct metapage *mp;
1545 pxd_t *pxd;
1546
1547 mp = tlck->mp;
1548
1549 /* initialize as REDOPAGE record format */
1550 lrd->log.redopage.type = cpu_to_le16(LOG_DATA);
1551 lrd->log.redopage.l2linesize = cpu_to_le16(L2DATASLOTSIZE);
1552
1553 pxd = &lrd->log.redopage.pxd;
1554
1555 /* log after-image for logredo(): */
1556 lrd->type = cpu_to_le16(LOG_REDOPAGE);
1557
1558 if (jfs_dirtable_inline(tlck->ip)) {
1559 /*
1560 * The table has been truncated, we've must have deleted
1561 * the last entry, so don't bother logging this
1562 */
1563 mp->lid = 0;
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001564 grab_metapage(mp);
1565 metapage_homeok(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 discard_metapage(mp);
1567 tlck->mp = NULL;
1568 return 0;
1569 }
1570
1571 PXDaddress(pxd, mp->index);
1572 PXDlength(pxd, mp->logical_size >> tblk->sb->s_blocksize_bits);
1573
1574 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1575
1576 /* mark page as homeward bound */
1577 tlck->flag |= tlckWRITEPAGE;
1578
1579 return 0;
1580}
1581
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001583 * dtLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001585 * function: log dtree tlock and format maplock to update bmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 */
1587static void dtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1588 struct tlock * tlck)
1589{
1590 struct metapage *mp;
1591 struct pxd_lock *pxdlock;
1592 pxd_t *pxd;
1593
1594 mp = tlck->mp;
1595
1596 /* initialize as REDOPAGE/NOREDOPAGE record format */
1597 lrd->log.redopage.type = cpu_to_le16(LOG_DTREE);
1598 lrd->log.redopage.l2linesize = cpu_to_le16(L2DTSLOTSIZE);
1599
1600 pxd = &lrd->log.redopage.pxd;
1601
1602 if (tlck->type & tlckBTROOT)
1603 lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
1604
1605 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001606 * page extension via relocation: entry insertion;
1607 * page extension in-place: entry insertion;
1608 * new right page from page split, reinitialized in-line
1609 * root from root page split: entry insertion;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 */
1611 if (tlck->type & (tlckNEW | tlckEXTEND)) {
1612 /* log after-image of the new page for logredo():
1613 * mark log (LOG_NEW) for logredo() to initialize
1614 * freelist and update bmap for alloc of the new page;
1615 */
1616 lrd->type = cpu_to_le16(LOG_REDOPAGE);
1617 if (tlck->type & tlckEXTEND)
1618 lrd->log.redopage.type |= cpu_to_le16(LOG_EXTEND);
1619 else
1620 lrd->log.redopage.type |= cpu_to_le16(LOG_NEW);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 PXDaddress(pxd, mp->index);
1622 PXDlength(pxd,
1623 mp->logical_size >> tblk->sb->s_blocksize_bits);
1624 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1625
1626 /* format a maplock for txUpdateMap() to update bPMAP for
1627 * alloc of the new page;
1628 */
1629 if (tlck->type & tlckBTROOT)
1630 return;
1631 tlck->flag |= tlckUPDATEMAP;
1632 pxdlock = (struct pxd_lock *) & tlck->lock;
1633 pxdlock->flag = mlckALLOCPXD;
1634 pxdlock->pxd = *pxd;
1635
1636 pxdlock->index = 1;
1637
1638 /* mark page as homeward bound */
1639 tlck->flag |= tlckWRITEPAGE;
1640 return;
1641 }
1642
1643 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001644 * entry insertion/deletion,
1645 * sibling page link update (old right page before split);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 */
1647 if (tlck->type & (tlckENTRY | tlckRELINK)) {
1648 /* log after-image for logredo(): */
1649 lrd->type = cpu_to_le16(LOG_REDOPAGE);
1650 PXDaddress(pxd, mp->index);
1651 PXDlength(pxd,
1652 mp->logical_size >> tblk->sb->s_blocksize_bits);
1653 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1654
1655 /* mark page as homeward bound */
1656 tlck->flag |= tlckWRITEPAGE;
1657 return;
1658 }
1659
1660 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001661 * page deletion: page has been invalidated
1662 * page relocation: source extent
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001664 * a maplock for free of the page has been formatted
1665 * at txLock() time);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 */
1667 if (tlck->type & (tlckFREE | tlckRELOCATE)) {
1668 /* log LOG_NOREDOPAGE of the deleted page for logredo()
1669 * to start NoRedoPage filter and to update bmap for free
1670 * of the deletd page
1671 */
1672 lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
1673 pxdlock = (struct pxd_lock *) & tlck->lock;
1674 *pxd = pxdlock->pxd;
1675 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1676
1677 /* a maplock for txUpdateMap() for free of the page
1678 * has been formatted at txLock() time;
1679 */
1680 tlck->flag |= tlckUPDATEMAP;
1681 }
1682 return;
1683}
1684
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001686 * xtLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001688 * function: log xtree tlock and format maplock to update bmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 */
1690static void xtLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
1691 struct tlock * tlck)
1692{
1693 struct inode *ip;
1694 struct metapage *mp;
1695 xtpage_t *p;
1696 struct xtlock *xtlck;
1697 struct maplock *maplock;
1698 struct xdlistlock *xadlock;
1699 struct pxd_lock *pxdlock;
Dave Kleikamp66f31312005-05-02 12:24:46 -06001700 pxd_t *page_pxd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 int next, lwm, hwm;
1702
1703 ip = tlck->ip;
1704 mp = tlck->mp;
1705
1706 /* initialize as REDOPAGE/NOREDOPAGE record format */
1707 lrd->log.redopage.type = cpu_to_le16(LOG_XTREE);
1708 lrd->log.redopage.l2linesize = cpu_to_le16(L2XTSLOTSIZE);
1709
Dave Kleikamp66f31312005-05-02 12:24:46 -06001710 page_pxd = &lrd->log.redopage.pxd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711
1712 if (tlck->type & tlckBTROOT) {
1713 lrd->log.redopage.type |= cpu_to_le16(LOG_BTROOT);
1714 p = &JFS_IP(ip)->i_xtroot;
1715 if (S_ISDIR(ip->i_mode))
1716 lrd->log.redopage.type |=
1717 cpu_to_le16(LOG_DIR_XTREE);
1718 } else
1719 p = (xtpage_t *) mp->data;
1720 next = le16_to_cpu(p->header.nextindex);
1721
1722 xtlck = (struct xtlock *) & tlck->lock;
1723
1724 maplock = (struct maplock *) & tlck->lock;
1725 xadlock = (struct xdlistlock *) maplock;
1726
1727 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001728 * entry insertion/extension;
1729 * sibling page link update (old right page before split);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 */
1731 if (tlck->type & (tlckNEW | tlckGROW | tlckRELINK)) {
1732 /* log after-image for logredo():
1733 * logredo() will update bmap for alloc of new/extended
1734 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1735 * after-image of XADlist;
1736 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1737 * applying the after-image to the meta-data page.
1738 */
1739 lrd->type = cpu_to_le16(LOG_REDOPAGE);
Dave Kleikamp66f31312005-05-02 12:24:46 -06001740 PXDaddress(page_pxd, mp->index);
1741 PXDlength(page_pxd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 mp->logical_size >> tblk->sb->s_blocksize_bits);
1743 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1744
1745 /* format a maplock for txUpdateMap() to update bPMAP
1746 * for alloc of new/extended extents of XAD[lwm:next)
1747 * from the page itself;
1748 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
1749 */
1750 lwm = xtlck->lwm.offset;
1751 if (lwm == 0)
1752 lwm = XTPAGEMAXSLOT;
1753
1754 if (lwm == next)
1755 goto out;
1756 if (lwm > next) {
1757 jfs_err("xtLog: lwm > next\n");
1758 goto out;
1759 }
1760 tlck->flag |= tlckUPDATEMAP;
1761 xadlock->flag = mlckALLOCXADLIST;
1762 xadlock->count = next - lwm;
Dave Kleikamp66f31312005-05-02 12:24:46 -06001763 if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 int i;
Dave Kleikamp66f31312005-05-02 12:24:46 -06001765 pxd_t *pxd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 /*
1767 * Lazy commit may allow xtree to be modified before
1768 * txUpdateMap runs. Copy xad into linelock to
1769 * preserve correct data.
Dave Kleikamp66f31312005-05-02 12:24:46 -06001770 *
1771 * We can fit twice as may pxd's as xads in the lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 */
Dave Kleikamp66f31312005-05-02 12:24:46 -06001773 xadlock->flag = mlckALLOCPXDLIST;
1774 pxd = xadlock->xdlist = &xtlck->pxdlock;
1775 for (i = 0; i < xadlock->count; i++) {
1776 PXDaddress(pxd, addressXAD(&p->xad[lwm + i]));
1777 PXDlength(pxd, lengthXAD(&p->xad[lwm + i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 p->xad[lwm + i].flag &=
1779 ~(XAD_NEW | XAD_EXTENDED);
Dave Kleikamp66f31312005-05-02 12:24:46 -06001780 pxd++;
1781 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782 } else {
1783 /*
1784 * xdlist will point to into inode's xtree, ensure
1785 * that transaction is not committed lazily.
1786 */
Dave Kleikamp66f31312005-05-02 12:24:46 -06001787 xadlock->flag = mlckALLOCXADLIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 xadlock->xdlist = &p->xad[lwm];
1789 tblk->xflag &= ~COMMIT_LAZY;
1790 }
1791 jfs_info("xtLog: alloc ip:0x%p mp:0x%p tlck:0x%p lwm:%d "
1792 "count:%d", tlck->ip, mp, tlck, lwm, xadlock->count);
1793
1794 maplock->index = 1;
1795
1796 out:
1797 /* mark page as homeward bound */
1798 tlck->flag |= tlckWRITEPAGE;
1799
1800 return;
1801 }
1802
1803 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001804 * page deletion: file deletion/truncation (ref. xtTruncate())
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 *
1806 * (page will be invalidated after log is written and bmap
1807 * is updated from the page);
1808 */
1809 if (tlck->type & tlckFREE) {
1810 /* LOG_NOREDOPAGE log for NoRedoPage filter:
1811 * if page free from file delete, NoRedoFile filter from
1812 * inode image of zero link count will subsume NoRedoPage
1813 * filters for each page;
1814 * if page free from file truncattion, write NoRedoPage
1815 * filter;
1816 *
1817 * upadte of block allocation map for the page itself:
1818 * if page free from deletion and truncation, LOG_UPDATEMAP
1819 * log for the page itself is generated from processing
1820 * its parent page xad entries;
1821 */
1822 /* if page free from file truncation, log LOG_NOREDOPAGE
1823 * of the deleted page for logredo() to start NoRedoPage
1824 * filter for the page;
1825 */
1826 if (tblk->xflag & COMMIT_TRUNCATE) {
1827 /* write NOREDOPAGE for the page */
1828 lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
Dave Kleikamp66f31312005-05-02 12:24:46 -06001829 PXDaddress(page_pxd, mp->index);
1830 PXDlength(page_pxd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 mp->logical_size >> tblk->sb->
1832 s_blocksize_bits);
1833 lrd->backchain =
1834 cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1835
1836 if (tlck->type & tlckBTROOT) {
1837 /* Empty xtree must be logged */
1838 lrd->type = cpu_to_le16(LOG_REDOPAGE);
1839 lrd->backchain =
1840 cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1841 }
1842 }
1843
1844 /* init LOG_UPDATEMAP of the freed extents
1845 * XAD[XTENTRYSTART:hwm) from the deleted page itself
1846 * for logredo() to update bmap;
1847 */
1848 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1849 lrd->log.updatemap.type = cpu_to_le16(LOG_FREEXADLIST);
1850 xtlck = (struct xtlock *) & tlck->lock;
1851 hwm = xtlck->hwm.offset;
1852 lrd->log.updatemap.nxd =
1853 cpu_to_le16(hwm - XTENTRYSTART + 1);
1854 /* reformat linelock for lmLog() */
1855 xtlck->header.offset = XTENTRYSTART;
1856 xtlck->header.length = hwm - XTENTRYSTART + 1;
1857 xtlck->index = 1;
1858 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1859
1860 /* format a maplock for txUpdateMap() to update bmap
1861 * to free extents of XAD[XTENTRYSTART:hwm) from the
1862 * deleted page itself;
1863 */
1864 tlck->flag |= tlckUPDATEMAP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865 xadlock->count = hwm - XTENTRYSTART + 1;
Dave Kleikamp66f31312005-05-02 12:24:46 -06001866 if ((xadlock->count <= 4) && (tblk->xflag & COMMIT_LAZY)) {
1867 int i;
1868 pxd_t *pxd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 /*
1870 * Lazy commit may allow xtree to be modified before
1871 * txUpdateMap runs. Copy xad into linelock to
1872 * preserve correct data.
Dave Kleikamp66f31312005-05-02 12:24:46 -06001873 *
1874 * We can fit twice as may pxd's as xads in the lock
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 */
Dave Kleikamp66f31312005-05-02 12:24:46 -06001876 xadlock->flag = mlckFREEPXDLIST;
1877 pxd = xadlock->xdlist = &xtlck->pxdlock;
1878 for (i = 0; i < xadlock->count; i++) {
1879 PXDaddress(pxd,
1880 addressXAD(&p->xad[XTENTRYSTART + i]));
1881 PXDlength(pxd,
1882 lengthXAD(&p->xad[XTENTRYSTART + i]));
1883 pxd++;
1884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 } else {
1886 /*
1887 * xdlist will point to into inode's xtree, ensure
1888 * that transaction is not committed lazily.
1889 */
Dave Kleikamp66f31312005-05-02 12:24:46 -06001890 xadlock->flag = mlckFREEXADLIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 xadlock->xdlist = &p->xad[XTENTRYSTART];
1892 tblk->xflag &= ~COMMIT_LAZY;
1893 }
1894 jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d lwm:2",
1895 tlck->ip, mp, xadlock->count);
1896
1897 maplock->index = 1;
1898
1899 /* mark page as invalid */
1900 if (((tblk->xflag & COMMIT_PWMAP) || S_ISDIR(ip->i_mode))
1901 && !(tlck->type & tlckBTROOT))
1902 tlck->flag |= tlckFREEPAGE;
1903 /*
1904 else (tblk->xflag & COMMIT_PMAP)
1905 ? release the page;
1906 */
1907 return;
1908 }
1909
1910 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001911 * page/entry truncation: file truncation (ref. xtTruncate())
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001913 * |----------+------+------+---------------|
1914 * | | |
1915 * | | hwm - hwm before truncation
1916 * | next - truncation point
1917 * lwm - lwm before truncation
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 * header ?
1919 */
1920 if (tlck->type & tlckTRUNCATE) {
Dave Kleikampc9e3ad62007-02-09 15:36:47 -06001921 /* This odd declaration suppresses a bogus gcc warning */
1922 pxd_t pxd = pxd; /* truncated extent of xad */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 int twm;
1924
1925 /*
1926 * For truncation the entire linelock may be used, so it would
1927 * be difficult to store xad list in linelock itself.
1928 * Therefore, we'll just force transaction to be committed
1929 * synchronously, so that xtree pages won't be changed before
1930 * txUpdateMap runs.
1931 */
1932 tblk->xflag &= ~COMMIT_LAZY;
1933 lwm = xtlck->lwm.offset;
1934 if (lwm == 0)
1935 lwm = XTPAGEMAXSLOT;
1936 hwm = xtlck->hwm.offset;
1937 twm = xtlck->twm.offset;
1938
1939 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001940 * write log records
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 */
1942 /* log after-image for logredo():
1943 *
1944 * logredo() will update bmap for alloc of new/extended
1945 * extents (XAD_NEW|XAD_EXTEND) of XAD[lwm:next) from
1946 * after-image of XADlist;
1947 * logredo() resets (XAD_NEW|XAD_EXTEND) flag when
1948 * applying the after-image to the meta-data page.
1949 */
1950 lrd->type = cpu_to_le16(LOG_REDOPAGE);
Dave Kleikamp66f31312005-05-02 12:24:46 -06001951 PXDaddress(page_pxd, mp->index);
1952 PXDlength(page_pxd,
1953 mp->logical_size >> tblk->sb->s_blocksize_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1955
1956 /*
1957 * truncate entry XAD[twm == next - 1]:
1958 */
1959 if (twm == next - 1) {
1960 /* init LOG_UPDATEMAP for logredo() to update bmap for
1961 * free of truncated delta extent of the truncated
1962 * entry XAD[next - 1]:
1963 * (xtlck->pxdlock = truncated delta extent);
1964 */
1965 pxdlock = (struct pxd_lock *) & xtlck->pxdlock;
1966 /* assert(pxdlock->type & tlckTRUNCATE); */
1967 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1968 lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
1969 lrd->log.updatemap.nxd = cpu_to_le16(1);
1970 lrd->log.updatemap.pxd = pxdlock->pxd;
Dave Kleikamp66f31312005-05-02 12:24:46 -06001971 pxd = pxdlock->pxd; /* save to format maplock */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 lrd->backchain =
1973 cpu_to_le32(lmLog(log, tblk, lrd, NULL));
1974 }
1975
1976 /*
1977 * free entries XAD[next:hwm]:
1978 */
1979 if (hwm >= next) {
1980 /* init LOG_UPDATEMAP of the freed extents
1981 * XAD[next:hwm] from the deleted page itself
1982 * for logredo() to update bmap;
1983 */
1984 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
1985 lrd->log.updatemap.type =
1986 cpu_to_le16(LOG_FREEXADLIST);
1987 xtlck = (struct xtlock *) & tlck->lock;
1988 hwm = xtlck->hwm.offset;
1989 lrd->log.updatemap.nxd =
1990 cpu_to_le16(hwm - next + 1);
1991 /* reformat linelock for lmLog() */
1992 xtlck->header.offset = next;
1993 xtlck->header.length = hwm - next + 1;
1994 xtlck->index = 1;
1995 lrd->backchain =
1996 cpu_to_le32(lmLog(log, tblk, lrd, tlck));
1997 }
1998
1999 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002000 * format maplock(s) for txUpdateMap() to update bmap
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 */
2002 maplock->index = 0;
2003
2004 /*
2005 * allocate entries XAD[lwm:next):
2006 */
2007 if (lwm < next) {
2008 /* format a maplock for txUpdateMap() to update bPMAP
2009 * for alloc of new/extended extents of XAD[lwm:next)
2010 * from the page itself;
2011 * txUpdateMap() resets (XAD_NEW|XAD_EXTEND) flag.
2012 */
2013 tlck->flag |= tlckUPDATEMAP;
2014 xadlock->flag = mlckALLOCXADLIST;
2015 xadlock->count = next - lwm;
2016 xadlock->xdlist = &p->xad[lwm];
2017
2018 jfs_info("xtLog: alloc ip:0x%p mp:0x%p count:%d "
2019 "lwm:%d next:%d",
2020 tlck->ip, mp, xadlock->count, lwm, next);
2021 maplock->index++;
2022 xadlock++;
2023 }
2024
2025 /*
2026 * truncate entry XAD[twm == next - 1]:
2027 */
2028 if (twm == next - 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029 /* format a maplock for txUpdateMap() to update bmap
2030 * to free truncated delta extent of the truncated
2031 * entry XAD[next - 1];
2032 * (xtlck->pxdlock = truncated delta extent);
2033 */
2034 tlck->flag |= tlckUPDATEMAP;
2035 pxdlock = (struct pxd_lock *) xadlock;
2036 pxdlock->flag = mlckFREEPXD;
2037 pxdlock->count = 1;
Dave Kleikamp66f31312005-05-02 12:24:46 -06002038 pxdlock->pxd = pxd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039
2040 jfs_info("xtLog: truncate ip:0x%p mp:0x%p count:%d "
2041 "hwm:%d", ip, mp, pxdlock->count, hwm);
2042 maplock->index++;
2043 xadlock++;
2044 }
2045
2046 /*
2047 * free entries XAD[next:hwm]:
2048 */
2049 if (hwm >= next) {
2050 /* format a maplock for txUpdateMap() to update bmap
2051 * to free extents of XAD[next:hwm] from thedeleted
2052 * page itself;
2053 */
2054 tlck->flag |= tlckUPDATEMAP;
2055 xadlock->flag = mlckFREEXADLIST;
2056 xadlock->count = hwm - next + 1;
2057 xadlock->xdlist = &p->xad[next];
2058
2059 jfs_info("xtLog: free ip:0x%p mp:0x%p count:%d "
2060 "next:%d hwm:%d",
2061 tlck->ip, mp, xadlock->count, next, hwm);
2062 maplock->index++;
2063 }
2064
2065 /* mark page as homeward bound */
2066 tlck->flag |= tlckWRITEPAGE;
2067 }
2068 return;
2069}
2070
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002072 * mapLog()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002074 * function: log from maplock of freed data extents;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 */
Dave Kleikamp6cb12692005-09-15 23:25:41 -05002076static void mapLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
2077 struct tlock * tlck)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078{
2079 struct pxd_lock *pxdlock;
2080 int i, nlock;
2081 pxd_t *pxd;
2082
2083 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002084 * page relocation: free the source page extent
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 *
2086 * a maplock for txUpdateMap() for free of the page
2087 * has been formatted at txLock() time saving the src
2088 * relocated page address;
2089 */
2090 if (tlck->type & tlckRELOCATE) {
2091 /* log LOG_NOREDOPAGE of the old relocated page
2092 * for logredo() to start NoRedoPage filter;
2093 */
2094 lrd->type = cpu_to_le16(LOG_NOREDOPAGE);
2095 pxdlock = (struct pxd_lock *) & tlck->lock;
2096 pxd = &lrd->log.redopage.pxd;
2097 *pxd = pxdlock->pxd;
2098 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2099
2100 /* (N.B. currently, logredo() does NOT update bmap
2101 * for free of the page itself for (LOG_XTREE|LOG_NOREDOPAGE);
2102 * if page free from relocation, LOG_UPDATEMAP log is
2103 * specifically generated now for logredo()
2104 * to update bmap for free of src relocated page;
2105 * (new flag LOG_RELOCATE may be introduced which will
2106 * inform logredo() to start NORedoPage filter and also
2107 * update block allocation map at the same time, thus
2108 * avoiding an extra log write);
2109 */
2110 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
2111 lrd->log.updatemap.type = cpu_to_le16(LOG_FREEPXD);
2112 lrd->log.updatemap.nxd = cpu_to_le16(1);
2113 lrd->log.updatemap.pxd = pxdlock->pxd;
2114 lrd->backchain = cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2115
2116 /* a maplock for txUpdateMap() for free of the page
2117 * has been formatted at txLock() time;
2118 */
2119 tlck->flag |= tlckUPDATEMAP;
2120 return;
2121 }
2122 /*
2123
2124 * Otherwise it's not a relocate request
2125 *
2126 */
2127 else {
2128 /* log LOG_UPDATEMAP for logredo() to update bmap for
2129 * free of truncated/relocated delta extent of the data;
2130 * e.g.: external EA extent, relocated/truncated extent
2131 * from xtTailgate();
2132 */
2133 lrd->type = cpu_to_le16(LOG_UPDATEMAP);
2134 pxdlock = (struct pxd_lock *) & tlck->lock;
2135 nlock = pxdlock->index;
2136 for (i = 0; i < nlock; i++, pxdlock++) {
2137 if (pxdlock->flag & mlckALLOCPXD)
2138 lrd->log.updatemap.type =
2139 cpu_to_le16(LOG_ALLOCPXD);
2140 else
2141 lrd->log.updatemap.type =
2142 cpu_to_le16(LOG_FREEPXD);
2143 lrd->log.updatemap.nxd = cpu_to_le16(1);
2144 lrd->log.updatemap.pxd = pxdlock->pxd;
2145 lrd->backchain =
2146 cpu_to_le32(lmLog(log, tblk, lrd, NULL));
2147 jfs_info("mapLog: xaddr:0x%lx xlen:0x%x",
2148 (ulong) addressPXD(&pxdlock->pxd),
2149 lengthPXD(&pxdlock->pxd));
2150 }
2151
2152 /* update bmap */
2153 tlck->flag |= tlckUPDATEMAP;
2154 }
2155}
2156
Linus Torvalds1da177e2005-04-16 15:20:36 -07002157/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002158 * txEA()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002160 * function: acquire maplock for EA/ACL extents or
2161 * set COMMIT_INLINE flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 */
2163void txEA(tid_t tid, struct inode *ip, dxd_t * oldea, dxd_t * newea)
2164{
2165 struct tlock *tlck = NULL;
2166 struct pxd_lock *maplock = NULL, *pxdlock = NULL;
2167
2168 /*
2169 * format maplock for alloc of new EA extent
2170 */
2171 if (newea) {
2172 /* Since the newea could be a completely zeroed entry we need to
2173 * check for the two flags which indicate we should actually
2174 * commit new EA data
2175 */
2176 if (newea->flag & DXD_EXTENT) {
2177 tlck = txMaplock(tid, ip, tlckMAP);
2178 maplock = (struct pxd_lock *) & tlck->lock;
2179 pxdlock = (struct pxd_lock *) maplock;
2180 pxdlock->flag = mlckALLOCPXD;
2181 PXDaddress(&pxdlock->pxd, addressDXD(newea));
2182 PXDlength(&pxdlock->pxd, lengthDXD(newea));
2183 pxdlock++;
2184 maplock->index = 1;
2185 } else if (newea->flag & DXD_INLINE) {
2186 tlck = NULL;
2187
2188 set_cflag(COMMIT_Inlineea, ip);
2189 }
2190 }
2191
2192 /*
2193 * format maplock for free of old EA extent
2194 */
2195 if (!test_cflag(COMMIT_Nolink, ip) && oldea->flag & DXD_EXTENT) {
2196 if (tlck == NULL) {
2197 tlck = txMaplock(tid, ip, tlckMAP);
2198 maplock = (struct pxd_lock *) & tlck->lock;
2199 pxdlock = (struct pxd_lock *) maplock;
2200 maplock->index = 0;
2201 }
2202 pxdlock->flag = mlckFREEPXD;
2203 PXDaddress(&pxdlock->pxd, addressDXD(oldea));
2204 PXDlength(&pxdlock->pxd, lengthDXD(oldea));
2205 maplock->index++;
2206 }
2207}
2208
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002210 * txForce()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211 *
2212 * function: synchronously write pages locked by transaction
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002213 * after txLog() but before txUpdateMap();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 */
Dave Kleikamp6cb12692005-09-15 23:25:41 -05002215static void txForce(struct tblock * tblk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216{
2217 struct tlock *tlck;
2218 lid_t lid, next;
2219 struct metapage *mp;
2220
2221 /*
2222 * reverse the order of transaction tlocks in
2223 * careful update order of address index pages
2224 * (right to left, bottom up)
2225 */
2226 tlck = lid_to_tlock(tblk->next);
2227 lid = tlck->next;
2228 tlck->next = 0;
2229 while (lid) {
2230 tlck = lid_to_tlock(lid);
2231 next = tlck->next;
2232 tlck->next = tblk->next;
2233 tblk->next = lid;
2234 lid = next;
2235 }
2236
2237 /*
2238 * synchronously write the page, and
2239 * hold the page for txUpdateMap();
2240 */
2241 for (lid = tblk->next; lid; lid = next) {
2242 tlck = lid_to_tlock(lid);
2243 next = tlck->next;
2244
2245 if ((mp = tlck->mp) != NULL &&
2246 (tlck->type & tlckBTROOT) == 0) {
2247 assert(mp->xflag & COMMIT_PAGE);
2248
2249 if (tlck->flag & tlckWRITEPAGE) {
2250 tlck->flag &= ~tlckWRITEPAGE;
2251
2252 /* do not release page to freelist */
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002253 force_metapage(mp);
2254#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 /*
2256 * The "right" thing to do here is to
2257 * synchronously write the metadata.
2258 * With the current implementation this
2259 * is hard since write_metapage requires
2260 * us to kunmap & remap the page. If we
2261 * have tlocks pointing into the metadata
2262 * pages, we don't want to do this. I think
2263 * we can get by with synchronously writing
2264 * the pages when they are released.
2265 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002266 assert(mp->nohomeok);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002267 set_bit(META_dirty, &mp->flag);
2268 set_bit(META_sync, &mp->flag);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002269#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 }
2271 }
2272 }
2273}
2274
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002276 * txUpdateMap()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002278 * function: update persistent allocation map (and working map
2279 * if appropriate);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 *
2281 * parameter:
2282 */
2283static void txUpdateMap(struct tblock * tblk)
2284{
2285 struct inode *ip;
2286 struct inode *ipimap;
2287 lid_t lid;
2288 struct tlock *tlck;
2289 struct maplock *maplock;
2290 struct pxd_lock pxdlock;
2291 int maptype;
2292 int k, nlock;
2293 struct metapage *mp = NULL;
2294
2295 ipimap = JFS_SBI(tblk->sb)->ipimap;
2296
2297 maptype = (tblk->xflag & COMMIT_PMAP) ? COMMIT_PMAP : COMMIT_PWMAP;
2298
2299
2300 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002301 * update block allocation map
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302 *
2303 * update allocation state in pmap (and wmap) and
2304 * update lsn of the pmap page;
2305 */
2306 /*
2307 * scan each tlock/page of transaction for block allocation/free:
2308 *
2309 * for each tlock/page of transaction, update map.
2310 * ? are there tlock for pmap and pwmap at the same time ?
2311 */
2312 for (lid = tblk->next; lid; lid = tlck->next) {
2313 tlck = lid_to_tlock(lid);
2314
2315 if ((tlck->flag & tlckUPDATEMAP) == 0)
2316 continue;
2317
2318 if (tlck->flag & tlckFREEPAGE) {
2319 /*
2320 * Another thread may attempt to reuse freed space
2321 * immediately, so we want to get rid of the metapage
2322 * before anyone else has a chance to get it.
2323 * Lock metapage, update maps, then invalidate
2324 * the metapage.
2325 */
2326 mp = tlck->mp;
2327 ASSERT(mp->xflag & COMMIT_PAGE);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002328 grab_metapage(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 }
2330
2331 /*
2332 * extent list:
2333 * . in-line PXD list:
2334 * . out-of-line XAD list:
2335 */
2336 maplock = (struct maplock *) & tlck->lock;
2337 nlock = maplock->index;
2338
2339 for (k = 0; k < nlock; k++, maplock++) {
2340 /*
2341 * allocate blocks in persistent map:
2342 *
2343 * blocks have been allocated from wmap at alloc time;
2344 */
2345 if (maplock->flag & mlckALLOC) {
2346 txAllocPMap(ipimap, maplock, tblk);
2347 }
2348 /*
2349 * free blocks in persistent and working map:
2350 * blocks will be freed in pmap and then in wmap;
2351 *
2352 * ? tblock specifies the PMAP/PWMAP based upon
2353 * transaction
2354 *
2355 * free blocks in persistent map:
2356 * blocks will be freed from wmap at last reference
2357 * release of the object for regular files;
2358 *
2359 * Alway free blocks from both persistent & working
2360 * maps for directories
2361 */
2362 else { /* (maplock->flag & mlckFREE) */
2363
Dave Kleikamp438282d2005-09-20 14:58:11 -05002364 if (tlck->flag & tlckDIRECTORY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 txFreeMap(ipimap, maplock,
2366 tblk, COMMIT_PWMAP);
2367 else
2368 txFreeMap(ipimap, maplock,
2369 tblk, maptype);
2370 }
2371 }
2372 if (tlck->flag & tlckFREEPAGE) {
2373 if (!(tblk->flag & tblkGC_LAZY)) {
2374 /* This is equivalent to txRelease */
2375 ASSERT(mp->lid == lid);
2376 tlck->mp->lid = 0;
2377 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002378 assert(mp->nohomeok == 1);
2379 metapage_homeok(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 discard_metapage(mp);
2381 tlck->mp = NULL;
2382 }
2383 }
2384 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002385 * update inode allocation map
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386 *
2387 * update allocation state in pmap and
2388 * update lsn of the pmap page;
2389 * update in-memory inode flag/state
2390 *
2391 * unlock mapper/write lock
2392 */
2393 if (tblk->xflag & COMMIT_CREATE) {
Richard Knutsson4d817152006-09-30 23:27:14 -07002394 diUpdatePMap(ipimap, tblk->ino, false, tblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 /* update persistent block allocation map
2396 * for the allocation of inode extent;
2397 */
2398 pxdlock.flag = mlckALLOCPXD;
2399 pxdlock.pxd = tblk->u.ixpxd;
2400 pxdlock.index = 1;
2401 txAllocPMap(ipimap, (struct maplock *) & pxdlock, tblk);
2402 } else if (tblk->xflag & COMMIT_DELETE) {
2403 ip = tblk->u.ip;
Richard Knutsson4d817152006-09-30 23:27:14 -07002404 diUpdatePMap(ipimap, ip->i_ino, true, tblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002405 iput(ip);
2406 }
2407}
2408
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002410 * txAllocPMap()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 *
2412 * function: allocate from persistent map;
2413 *
2414 * parameter:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002415 * ipbmap -
2416 * malock -
2417 * xad list:
2418 * pxd:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002420 * maptype -
2421 * allocate from persistent map;
2422 * free from persistent map;
2423 * (e.g., tmp file - free from working map at releae
2424 * of last reference);
2425 * free from persistent and working map;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002427 * lsn - log sequence number;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 */
2429static void txAllocPMap(struct inode *ip, struct maplock * maplock,
2430 struct tblock * tblk)
2431{
2432 struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
2433 struct xdlistlock *xadlistlock;
2434 xad_t *xad;
2435 s64 xaddr;
2436 int xlen;
2437 struct pxd_lock *pxdlock;
2438 struct xdlistlock *pxdlistlock;
2439 pxd_t *pxd;
2440 int n;
2441
2442 /*
2443 * allocate from persistent map;
2444 */
2445 if (maplock->flag & mlckALLOCXADLIST) {
2446 xadlistlock = (struct xdlistlock *) maplock;
2447 xad = xadlistlock->xdlist;
2448 for (n = 0; n < xadlistlock->count; n++, xad++) {
2449 if (xad->flag & (XAD_NEW | XAD_EXTENDED)) {
2450 xaddr = addressXAD(xad);
2451 xlen = lengthXAD(xad);
Richard Knutsson4d817152006-09-30 23:27:14 -07002452 dbUpdatePMap(ipbmap, false, xaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002453 (s64) xlen, tblk);
2454 xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
2455 jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2456 (ulong) xaddr, xlen);
2457 }
2458 }
2459 } else if (maplock->flag & mlckALLOCPXD) {
2460 pxdlock = (struct pxd_lock *) maplock;
2461 xaddr = addressPXD(&pxdlock->pxd);
2462 xlen = lengthPXD(&pxdlock->pxd);
Richard Knutsson4d817152006-09-30 23:27:14 -07002463 dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen, tblk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464 jfs_info("allocPMap: xaddr:0x%lx xlen:%d", (ulong) xaddr, xlen);
2465 } else { /* (maplock->flag & mlckALLOCPXDLIST) */
2466
2467 pxdlistlock = (struct xdlistlock *) maplock;
2468 pxd = pxdlistlock->xdlist;
2469 for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2470 xaddr = addressPXD(pxd);
2471 xlen = lengthPXD(pxd);
Richard Knutsson4d817152006-09-30 23:27:14 -07002472 dbUpdatePMap(ipbmap, false, xaddr, (s64) xlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473 tblk);
2474 jfs_info("allocPMap: xaddr:0x%lx xlen:%d",
2475 (ulong) xaddr, xlen);
2476 }
2477 }
2478}
2479
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002481 * txFreeMap()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002483 * function: free from persistent and/or working map;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484 *
2485 * todo: optimization
2486 */
2487void txFreeMap(struct inode *ip,
2488 struct maplock * maplock, struct tblock * tblk, int maptype)
2489{
2490 struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
2491 struct xdlistlock *xadlistlock;
2492 xad_t *xad;
2493 s64 xaddr;
2494 int xlen;
2495 struct pxd_lock *pxdlock;
2496 struct xdlistlock *pxdlistlock;
2497 pxd_t *pxd;
2498 int n;
2499
2500 jfs_info("txFreeMap: tblk:0x%p maplock:0x%p maptype:0x%x",
2501 tblk, maplock, maptype);
2502
2503 /*
2504 * free from persistent map;
2505 */
2506 if (maptype == COMMIT_PMAP || maptype == COMMIT_PWMAP) {
2507 if (maplock->flag & mlckFREEXADLIST) {
2508 xadlistlock = (struct xdlistlock *) maplock;
2509 xad = xadlistlock->xdlist;
2510 for (n = 0; n < xadlistlock->count; n++, xad++) {
2511 if (!(xad->flag & XAD_NEW)) {
2512 xaddr = addressXAD(xad);
2513 xlen = lengthXAD(xad);
Richard Knutsson4d817152006-09-30 23:27:14 -07002514 dbUpdatePMap(ipbmap, true, xaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 (s64) xlen, tblk);
2516 jfs_info("freePMap: xaddr:0x%lx "
2517 "xlen:%d",
2518 (ulong) xaddr, xlen);
2519 }
2520 }
2521 } else if (maplock->flag & mlckFREEPXD) {
2522 pxdlock = (struct pxd_lock *) maplock;
2523 xaddr = addressPXD(&pxdlock->pxd);
2524 xlen = lengthPXD(&pxdlock->pxd);
Richard Knutsson4d817152006-09-30 23:27:14 -07002525 dbUpdatePMap(ipbmap, true, xaddr, (s64) xlen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 tblk);
2527 jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2528 (ulong) xaddr, xlen);
2529 } else { /* (maplock->flag & mlckALLOCPXDLIST) */
2530
2531 pxdlistlock = (struct xdlistlock *) maplock;
2532 pxd = pxdlistlock->xdlist;
2533 for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2534 xaddr = addressPXD(pxd);
2535 xlen = lengthPXD(pxd);
Richard Knutsson4d817152006-09-30 23:27:14 -07002536 dbUpdatePMap(ipbmap, true, xaddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 (s64) xlen, tblk);
2538 jfs_info("freePMap: xaddr:0x%lx xlen:%d",
2539 (ulong) xaddr, xlen);
2540 }
2541 }
2542 }
2543
2544 /*
2545 * free from working map;
2546 */
2547 if (maptype == COMMIT_PWMAP || maptype == COMMIT_WMAP) {
2548 if (maplock->flag & mlckFREEXADLIST) {
2549 xadlistlock = (struct xdlistlock *) maplock;
2550 xad = xadlistlock->xdlist;
2551 for (n = 0; n < xadlistlock->count; n++, xad++) {
2552 xaddr = addressXAD(xad);
2553 xlen = lengthXAD(xad);
2554 dbFree(ip, xaddr, (s64) xlen);
2555 xad->flag = 0;
2556 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2557 (ulong) xaddr, xlen);
2558 }
2559 } else if (maplock->flag & mlckFREEPXD) {
2560 pxdlock = (struct pxd_lock *) maplock;
2561 xaddr = addressPXD(&pxdlock->pxd);
2562 xlen = lengthPXD(&pxdlock->pxd);
2563 dbFree(ip, xaddr, (s64) xlen);
2564 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2565 (ulong) xaddr, xlen);
2566 } else { /* (maplock->flag & mlckFREEPXDLIST) */
2567
2568 pxdlistlock = (struct xdlistlock *) maplock;
2569 pxd = pxdlistlock->xdlist;
2570 for (n = 0; n < pxdlistlock->count; n++, pxd++) {
2571 xaddr = addressPXD(pxd);
2572 xlen = lengthPXD(pxd);
2573 dbFree(ip, xaddr, (s64) xlen);
2574 jfs_info("freeWMap: xaddr:0x%lx xlen:%d",
2575 (ulong) xaddr, xlen);
2576 }
2577 }
2578 }
2579}
2580
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002582 * txFreelock()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002584 * function: remove tlock from inode anonymous locklist
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585 */
2586void txFreelock(struct inode *ip)
2587{
2588 struct jfs_inode_info *jfs_ip = JFS_IP(ip);
2589 struct tlock *xtlck, *tlck;
2590 lid_t xlid = 0, lid;
2591
2592 if (!jfs_ip->atlhead)
2593 return;
2594
2595 TXN_LOCK();
2596 xtlck = (struct tlock *) &jfs_ip->atlhead;
2597
2598 while ((lid = xtlck->next) != 0) {
2599 tlck = lid_to_tlock(lid);
2600 if (tlck->flag & tlckFREELOCK) {
2601 xtlck->next = tlck->next;
2602 txLockFree(lid);
2603 } else {
2604 xtlck = tlck;
2605 xlid = lid;
2606 }
2607 }
2608
2609 if (jfs_ip->atlhead)
2610 jfs_ip->atltail = xlid;
2611 else {
2612 jfs_ip->atltail = 0;
2613 /*
2614 * If inode was on anon_list, remove it
2615 */
2616 list_del_init(&jfs_ip->anon_inode_list);
2617 }
2618 TXN_UNLOCK();
2619}
2620
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002622 * txAbort()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002623 *
2624 * function: abort tx before commit;
2625 *
2626 * frees line-locks and segment locks for all
2627 * segments in comdata structure.
2628 * Optionally sets state of file-system to FM_DIRTY in super-block.
2629 * log age of page-frames in memory for which caller has
2630 * are reset to 0 (to avoid logwarap).
2631 */
2632void txAbort(tid_t tid, int dirty)
2633{
2634 lid_t lid, next;
2635 struct metapage *mp;
2636 struct tblock *tblk = tid_to_tblock(tid);
2637 struct tlock *tlck;
2638
2639 /*
2640 * free tlocks of the transaction
2641 */
2642 for (lid = tblk->next; lid; lid = next) {
2643 tlck = lid_to_tlock(lid);
2644 next = tlck->next;
2645 mp = tlck->mp;
2646 JFS_IP(tlck->ip)->xtlid = 0;
2647
2648 if (mp) {
2649 mp->lid = 0;
2650
2651 /*
2652 * reset lsn of page to avoid logwarap:
2653 *
2654 * (page may have been previously committed by another
2655 * transaction(s) but has not been paged, i.e.,
2656 * it may be on logsync list even though it has not
2657 * been logged for the current tx.)
2658 */
2659 if (mp->xflag & COMMIT_PAGE && mp->lsn)
2660 LogSyncRelease(mp);
2661 }
2662 /* insert tlock at head of freelist */
2663 TXN_LOCK();
2664 txLockFree(lid);
2665 TXN_UNLOCK();
2666 }
2667
2668 /* caller will free the transaction block */
2669
2670 tblk->next = tblk->last = 0;
2671
2672 /*
2673 * mark filesystem dirty
2674 */
2675 if (dirty)
2676 jfs_error(tblk->sb, "txAbort");
2677
2678 return;
2679}
2680
2681/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002682 * txLazyCommit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 *
2684 * All transactions except those changing ipimap (COMMIT_FORCE) are
2685 * processed by this routine. This insures that the inode and block
2686 * allocation maps are updated in order. For synchronous transactions,
2687 * let the user thread finish processing after txUpdateMap() is called.
2688 */
2689static void txLazyCommit(struct tblock * tblk)
2690{
2691 struct jfs_log *log;
2692
2693 while (((tblk->flag & tblkGC_READY) == 0) &&
2694 ((tblk->flag & tblkGC_UNLOCKED) == 0)) {
2695 /* We must have gotten ahead of the user thread
2696 */
2697 jfs_info("jfs_lazycommit: tblk 0x%p not unlocked", tblk);
2698 yield();
2699 }
2700
2701 jfs_info("txLazyCommit: processing tblk 0x%p", tblk);
2702
2703 txUpdateMap(tblk);
2704
2705 log = (struct jfs_log *) JFS_SBI(tblk->sb)->log;
2706
2707 spin_lock_irq(&log->gclock); // LOGGC_LOCK
2708
2709 tblk->flag |= tblkGC_COMMITTED;
2710
2711 if (tblk->flag & tblkGC_READY)
2712 log->gcrtc--;
2713
2714 wake_up_all(&tblk->gcwait); // LOGGC_WAKEUP
2715
2716 /*
2717 * Can't release log->gclock until we've tested tblk->flag
2718 */
2719 if (tblk->flag & tblkGC_LAZY) {
2720 spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
2721 txUnlock(tblk);
2722 tblk->flag &= ~tblkGC_LAZY;
2723 txEnd(tblk - TxBlock); /* Convert back to tid */
2724 } else
2725 spin_unlock_irq(&log->gclock); // LOGGC_UNLOCK
2726
2727 jfs_info("txLazyCommit: done: tblk = 0x%p", tblk);
2728}
2729
2730/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002731 * jfs_lazycommit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732 *
2733 * To be run as a kernel daemon. If lbmIODone is called in an interrupt
2734 * context, or where blocking is not wanted, this routine will process
2735 * committed transactions from the unlock queue.
2736 */
2737int jfs_lazycommit(void *arg)
2738{
2739 int WorkDone;
2740 struct tblock *tblk;
2741 unsigned long flags;
2742 struct jfs_sb_info *sbi;
2743
Linus Torvalds1da177e2005-04-16 15:20:36 -07002744 do {
2745 LAZY_LOCK(flags);
2746 jfs_commit_thread_waking = 0; /* OK to wake another thread */
2747 while (!list_empty(&TxAnchor.unlock_queue)) {
2748 WorkDone = 0;
2749 list_for_each_entry(tblk, &TxAnchor.unlock_queue,
2750 cqueue) {
2751
2752 sbi = JFS_SBI(tblk->sb);
2753 /*
2754 * For each volume, the transactions must be
2755 * handled in order. If another commit thread
2756 * is handling a tblk for this superblock,
2757 * skip it
2758 */
2759 if (sbi->commit_state & IN_LAZYCOMMIT)
2760 continue;
2761
2762 sbi->commit_state |= IN_LAZYCOMMIT;
2763 WorkDone = 1;
2764
2765 /*
2766 * Remove transaction from queue
2767 */
2768 list_del(&tblk->cqueue);
2769
2770 LAZY_UNLOCK(flags);
2771 txLazyCommit(tblk);
2772 LAZY_LOCK(flags);
2773
2774 sbi->commit_state &= ~IN_LAZYCOMMIT;
2775 /*
2776 * Don't continue in the for loop. (We can't
2777 * anyway, it's unsafe!) We want to go back to
2778 * the beginning of the list.
2779 */
2780 break;
2781 }
2782
2783 /* If there was nothing to do, don't continue */
2784 if (!WorkDone)
2785 break;
2786 }
2787 /* In case a wakeup came while all threads were active */
2788 jfs_commit_thread_waking = 0;
2789
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002790 if (freezing(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002791 LAZY_UNLOCK(flags);
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002792 refrigerator();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 } else {
2794 DECLARE_WAITQUEUE(wq, current);
2795
2796 add_wait_queue(&jfs_commit_thread_wait, &wq);
2797 set_current_state(TASK_INTERRUPTIBLE);
2798 LAZY_UNLOCK(flags);
2799 schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05002800 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801 remove_wait_queue(&jfs_commit_thread_wait, &wq);
2802 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002803 } while (!kthread_should_stop());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002804
2805 if (!list_empty(&TxAnchor.unlock_queue))
2806 jfs_err("jfs_lazycommit being killed w/pending transactions!");
2807 else
2808 jfs_info("jfs_lazycommit being killed\n");
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002809 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002810}
2811
2812void txLazyUnlock(struct tblock * tblk)
2813{
2814 unsigned long flags;
2815
2816 LAZY_LOCK(flags);
2817
2818 list_add_tail(&tblk->cqueue, &TxAnchor.unlock_queue);
2819 /*
2820 * Don't wake up a commit thread if there is already one servicing
2821 * this superblock, or if the last one we woke up hasn't started yet.
2822 */
2823 if (!(JFS_SBI(tblk->sb)->commit_state & IN_LAZYCOMMIT) &&
2824 !jfs_commit_thread_waking) {
2825 jfs_commit_thread_waking = 1;
2826 wake_up(&jfs_commit_thread_wait);
2827 }
2828 LAZY_UNLOCK(flags);
2829}
2830
2831static void LogSyncRelease(struct metapage * mp)
2832{
2833 struct jfs_log *log = mp->log;
2834
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002835 assert(mp->nohomeok);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002836 assert(log);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06002837 metapage_homeok(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838}
2839
2840/*
2841 * txQuiesce
2842 *
2843 * Block all new transactions and push anonymous transactions to
2844 * completion
2845 *
2846 * This does almost the same thing as jfs_sync below. We don't
2847 * worry about deadlocking when jfs_tlocks_low is set, since we would
2848 * expect jfs_sync to get us out of that jam.
2849 */
2850void txQuiesce(struct super_block *sb)
2851{
2852 struct inode *ip;
2853 struct jfs_inode_info *jfs_ip;
2854 struct jfs_log *log = JFS_SBI(sb)->log;
2855 tid_t tid;
2856
2857 set_bit(log_QUIESCE, &log->flag);
2858
2859 TXN_LOCK();
2860restart:
2861 while (!list_empty(&TxAnchor.anon_list)) {
2862 jfs_ip = list_entry(TxAnchor.anon_list.next,
2863 struct jfs_inode_info,
2864 anon_inode_list);
2865 ip = &jfs_ip->vfs_inode;
2866
2867 /*
2868 * inode will be removed from anonymous list
2869 * when it is committed
2870 */
2871 TXN_UNLOCK();
2872 tid = txBegin(ip->i_sb, COMMIT_INODE | COMMIT_FORCE);
Ingo Molnar1de87442006-01-24 15:22:50 -06002873 mutex_lock(&jfs_ip->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874 txCommit(tid, 1, &ip, 0);
2875 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -06002876 mutex_unlock(&jfs_ip->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877 /*
2878 * Just to be safe. I don't know how
2879 * long we can run without blocking
2880 */
2881 cond_resched();
2882 TXN_LOCK();
2883 }
2884
2885 /*
2886 * If jfs_sync is running in parallel, there could be some inodes
2887 * on anon_list2. Let's check.
2888 */
2889 if (!list_empty(&TxAnchor.anon_list2)) {
2890 list_splice(&TxAnchor.anon_list2, &TxAnchor.anon_list);
2891 INIT_LIST_HEAD(&TxAnchor.anon_list2);
2892 goto restart;
2893 }
2894 TXN_UNLOCK();
2895
2896 /*
2897 * We may need to kick off the group commit
2898 */
2899 jfs_flush_journal(log, 0);
2900}
2901
2902/*
2903 * txResume()
2904 *
2905 * Allows transactions to start again following txQuiesce
2906 */
2907void txResume(struct super_block *sb)
2908{
2909 struct jfs_log *log = JFS_SBI(sb)->log;
2910
2911 clear_bit(log_QUIESCE, &log->flag);
2912 TXN_WAKEUP(&log->syncwait);
2913}
2914
2915/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002916 * jfs_sync(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917 *
2918 * To be run as a kernel daemon. This is awakened when tlocks run low.
2919 * We write any inodes that have anonymous tlocks so they will become
2920 * available.
2921 */
2922int jfs_sync(void *arg)
2923{
2924 struct inode *ip;
2925 struct jfs_inode_info *jfs_ip;
2926 int rc;
2927 tid_t tid;
2928
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 do {
2930 /*
2931 * write each inode on the anonymous inode list
2932 */
2933 TXN_LOCK();
2934 while (jfs_tlocks_low && !list_empty(&TxAnchor.anon_list)) {
2935 jfs_ip = list_entry(TxAnchor.anon_list.next,
2936 struct jfs_inode_info,
2937 anon_inode_list);
2938 ip = &jfs_ip->vfs_inode;
2939
2940 if (! igrab(ip)) {
2941 /*
2942 * Inode is being freed
2943 */
2944 list_del_init(&jfs_ip->anon_inode_list);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -05002945 } else if (mutex_trylock(&jfs_ip->commit_mutex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002946 /*
2947 * inode will be removed from anonymous list
2948 * when it is committed
2949 */
2950 TXN_UNLOCK();
2951 tid = txBegin(ip->i_sb, COMMIT_INODE);
2952 rc = txCommit(tid, 1, &ip, 0);
2953 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -06002954 mutex_unlock(&jfs_ip->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
2956 iput(ip);
2957 /*
2958 * Just to be safe. I don't know how
2959 * long we can run without blocking
2960 */
2961 cond_resched();
2962 TXN_LOCK();
2963 } else {
Ingo Molnar1de87442006-01-24 15:22:50 -06002964 /* We can't get the commit mutex. It may
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 * be held by a thread waiting for tlock's
2966 * so let's not block here. Save it to
2967 * put back on the anon_list.
2968 */
2969
2970 /* Take off anon_list */
2971 list_del(&jfs_ip->anon_inode_list);
2972
2973 /* Put on anon_list2 */
2974 list_add(&jfs_ip->anon_inode_list,
2975 &TxAnchor.anon_list2);
2976
2977 TXN_UNLOCK();
2978 iput(ip);
2979 TXN_LOCK();
2980 }
2981 }
2982 /* Add anon_list2 back to anon_list */
2983 list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
2984
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002985 if (freezing(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 TXN_UNLOCK();
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002987 refrigerator();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989 set_current_state(TASK_INTERRUPTIBLE);
2990 TXN_UNLOCK();
2991 schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05002992 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002994 } while (!kthread_should_stop());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002995
2996 jfs_info("jfs_sync being killed");
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002997 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002998}
2999
3000#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_DEBUG)
3001int jfs_txanchor_read(char *buffer, char **start, off_t offset, int length,
3002 int *eof, void *data)
3003{
3004 int len = 0;
3005 off_t begin;
3006 char *freewait;
3007 char *freelockwait;
3008 char *lowlockwait;
3009
3010 freewait =
3011 waitqueue_active(&TxAnchor.freewait) ? "active" : "empty";
3012 freelockwait =
3013 waitqueue_active(&TxAnchor.freelockwait) ? "active" : "empty";
3014 lowlockwait =
3015 waitqueue_active(&TxAnchor.lowlockwait) ? "active" : "empty";
3016
3017 len += sprintf(buffer,
3018 "JFS TxAnchor\n"
3019 "============\n"
3020 "freetid = %d\n"
3021 "freewait = %s\n"
3022 "freelock = %d\n"
3023 "freelockwait = %s\n"
3024 "lowlockwait = %s\n"
3025 "tlocksInUse = %d\n"
3026 "jfs_tlocks_low = %d\n"
3027 "unlock_queue is %sempty\n",
3028 TxAnchor.freetid,
3029 freewait,
3030 TxAnchor.freelock,
3031 freelockwait,
3032 lowlockwait,
3033 TxAnchor.tlocksInUse,
3034 jfs_tlocks_low,
3035 list_empty(&TxAnchor.unlock_queue) ? "" : "not ");
3036
3037 begin = offset;
3038 *start = buffer + begin;
3039 len -= begin;
3040
3041 if (len > length)
3042 len = length;
3043 else
3044 *eof = 1;
3045
3046 if (len < 0)
3047 len = 0;
3048
3049 return len;
3050}
3051#endif
3052
3053#if defined(CONFIG_PROC_FS) && defined(CONFIG_JFS_STATISTICS)
3054int jfs_txstats_read(char *buffer, char **start, off_t offset, int length,
3055 int *eof, void *data)
3056{
3057 int len = 0;
3058 off_t begin;
3059
3060 len += sprintf(buffer,
3061 "JFS TxStats\n"
3062 "===========\n"
3063 "calls to txBegin = %d\n"
3064 "txBegin blocked by sync barrier = %d\n"
3065 "txBegin blocked by tlocks low = %d\n"
3066 "txBegin blocked by no free tid = %d\n"
3067 "calls to txBeginAnon = %d\n"
3068 "txBeginAnon blocked by sync barrier = %d\n"
3069 "txBeginAnon blocked by tlocks low = %d\n"
3070 "calls to txLockAlloc = %d\n"
3071 "tLockAlloc blocked by no free lock = %d\n",
3072 TxStat.txBegin,
3073 TxStat.txBegin_barrier,
3074 TxStat.txBegin_lockslow,
3075 TxStat.txBegin_freetid,
3076 TxStat.txBeginAnon,
3077 TxStat.txBeginAnon_barrier,
3078 TxStat.txBeginAnon_lockslow,
3079 TxStat.txLockAlloc,
3080 TxStat.txLockAlloc_freelock);
3081
3082 begin = offset;
3083 *start = buffer + begin;
3084 len -= begin;
3085
3086 if (len > length)
3087 len = length;
3088 else
3089 *eof = 1;
3090
3091 if (len < 0)
3092 len = 0;
3093
3094 return len;
3095}
3096#endif