blob: d27bac6acaa346118b39bb02517987130b5cdcfb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20/*
21 * jfs_logmgr.c: log manager
22 *
23 * for related information, see transaction manager (jfs_txnmgr.c), and
24 * recovery manager (jfs_logredo.c).
25 *
26 * note: for detail, RTFS.
27 *
28 * log buffer manager:
29 * special purpose buffer manager supporting log i/o requirements.
30 * per log serial pageout of logpage
31 * queuing i/o requests and redrive i/o at iodone
32 * maintain current logpage buffer
33 * no caching since append only
34 * appropriate jfs buffer cache buffers as needed
35 *
36 * group commit:
37 * transactions which wrote COMMIT records in the same in-memory
38 * log page during the pageout of previous/current log page(s) are
39 * committed together by the pageout of the page.
40 *
41 * TBD lazy commit:
42 * transactions are committed asynchronously when the log page
43 * containing it COMMIT is paged out when it becomes full;
44 *
45 * serialization:
46 * . a per log lock serialize log write.
47 * . a per log lock serialize group commit.
48 * . a per log lock serialize log open/close;
49 *
50 * TBD log integrity:
51 * careful-write (ping-pong) of last logpage to recover from crash
52 * in overwrite.
53 * detection of split (out-of-order) write of physical sectors
54 * of last logpage via timestamp at end of each sector
55 * with its mirror data array at trailer).
56 *
57 * alternatives:
58 * lsn - 64-bit monotonically increasing integer vs
59 * 32-bit lspn and page eor.
60 */
61
62#include <linux/fs.h>
63#include <linux/blkdev.h>
64#include <linux/interrupt.h>
65#include <linux/smp_lock.h>
66#include <linux/completion.h>
67#include <linux/buffer_head.h> /* for sync_blockdev() */
68#include <linux/bio.h>
69#include <linux/suspend.h>
70#include <linux/delay.h>
71#include "jfs_incore.h"
72#include "jfs_filsys.h"
73#include "jfs_metapage.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050074#include "jfs_superblock.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include "jfs_txnmgr.h"
76#include "jfs_debug.h"
77
78
79/*
80 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread)
81 */
82static struct lbuf *log_redrive_list;
83static DEFINE_SPINLOCK(log_redrive_lock);
84DECLARE_WAIT_QUEUE_HEAD(jfs_IO_thread_wait);
85
86
87/*
88 * log read/write serialization (per log)
89 */
90#define LOG_LOCK_INIT(log) init_MUTEX(&(log)->loglock)
91#define LOG_LOCK(log) down(&((log)->loglock))
92#define LOG_UNLOCK(log) up(&((log)->loglock))
93
94
95/*
96 * log group commit serialization (per log)
97 */
98
99#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock)
100#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock)
101#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock)
102#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait)
103
104/*
105 * log sync serialization (per log)
106 */
107#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE)
108#define LOGSYNC_BARRIER(logsize) ((logsize)/4)
109/*
110#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE)
111#define LOGSYNC_BARRIER(logsize) ((logsize)/2)
112*/
113
114
115/*
116 * log buffer cache synchronization
117 */
118static DEFINE_SPINLOCK(jfsLCacheLock);
119
120#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags)
121#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags)
122
123/*
124 * See __SLEEP_COND in jfs_locks.h
125 */
126#define LCACHE_SLEEP_COND(wq, cond, flags) \
127do { \
128 if (cond) \
129 break; \
130 __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \
131} while (0)
132
133#define LCACHE_WAKEUP(event) wake_up(event)
134
135
136/*
137 * lbuf buffer cache (lCache) control
138 */
139/* log buffer manager pageout control (cumulative, inclusive) */
140#define lbmREAD 0x0001
141#define lbmWRITE 0x0002 /* enqueue at tail of write queue;
142 * init pageout if at head of queue;
143 */
144#define lbmRELEASE 0x0004 /* remove from write queue
145 * at completion of pageout;
146 * do not free/recycle it yet:
147 * caller will free it;
148 */
149#define lbmSYNC 0x0008 /* do not return to freelist
150 * when removed from write queue;
151 */
152#define lbmFREE 0x0010 /* return to freelist
153 * at completion of pageout;
154 * the buffer may be recycled;
155 */
156#define lbmDONE 0x0020
157#define lbmERROR 0x0040
158#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing
159 * of log page
160 */
161#define lbmDIRECT 0x0100
162
163/*
164 * Global list of active external journals
165 */
166static LIST_HEAD(jfs_external_logs);
167static struct jfs_log *dummy_log = NULL;
168static DECLARE_MUTEX(jfs_log_sem);
169
170/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 * forward references
172 */
173static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
174 struct lrd * lrd, struct tlock * tlck);
175
176static int lmNextPage(struct jfs_log * log);
177static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
178 int activate);
179
180static int open_inline_log(struct super_block *sb);
181static int open_dummy_log(struct super_block *sb);
182static int lbmLogInit(struct jfs_log * log);
183static void lbmLogShutdown(struct jfs_log * log);
184static struct lbuf *lbmAllocate(struct jfs_log * log, int);
185static void lbmFree(struct lbuf * bp);
186static void lbmfree(struct lbuf * bp);
187static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);
188static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block);
189static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag);
190static int lbmIOWait(struct lbuf * bp, int flag);
191static bio_end_io_t lbmIODone;
192static void lbmStartIO(struct lbuf * bp);
193static void lmGCwrite(struct jfs_log * log, int cant_block);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500194static int lmLogSync(struct jfs_log * log, int hard_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196
197
198/*
199 * statistics
200 */
201#ifdef CONFIG_JFS_STATISTICS
202static struct lmStat {
203 uint commit; /* # of commit */
204 uint pagedone; /* # of page written */
205 uint submitted; /* # of pages submitted */
206 uint full_page; /* # of full pages submitted */
207 uint partial_page; /* # of partial pages submitted */
208} lmStat;
209#endif
210
211
212/*
213 * NAME: lmLog()
214 *
215 * FUNCTION: write a log record;
216 *
217 * PARAMETER:
218 *
219 * RETURN: lsn - offset to the next log record to write (end-of-log);
220 * -1 - error;
221 *
222 * note: todo: log error handler
223 */
224int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
225 struct tlock * tlck)
226{
227 int lsn;
228 int diffp, difft;
229 struct metapage *mp = NULL;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600230 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p",
233 log, tblk, lrd, tlck);
234
235 LOG_LOCK(log);
236
237 /* log by (out-of-transaction) JFS ? */
238 if (tblk == NULL)
239 goto writeRecord;
240
241 /* log from page ? */
242 if (tlck == NULL ||
243 tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL)
244 goto writeRecord;
245
246 /*
247 * initialize/update page/transaction recovery lsn
248 */
249 lsn = log->lsn;
250
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600251 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253 /*
254 * initialize page lsn if first log write of the page
255 */
256 if (mp->lsn == 0) {
257 mp->log = log;
258 mp->lsn = lsn;
259 log->count++;
260
261 /* insert page at tail of logsynclist */
262 list_add_tail(&mp->synclist, &log->synclist);
263 }
264
265 /*
266 * initialize/update lsn of tblock of the page
267 *
268 * transaction inherits oldest lsn of pages associated
269 * with allocation/deallocation of resources (their
270 * log records are used to reconstruct allocation map
271 * at recovery time: inode for inode allocation map,
272 * B+-tree index of extent descriptors for block
273 * allocation map);
274 * allocation map pages inherit transaction lsn at
275 * commit time to allow forwarding log syncpt past log
276 * records associated with allocation/deallocation of
277 * resources only after persistent map of these map pages
278 * have been updated and propagated to home.
279 */
280 /*
281 * initialize transaction lsn:
282 */
283 if (tblk->lsn == 0) {
284 /* inherit lsn of its first page logged */
285 tblk->lsn = mp->lsn;
286 log->count++;
287
288 /* insert tblock after the page on logsynclist */
289 list_add(&tblk->synclist, &mp->synclist);
290 }
291 /*
292 * update transaction lsn:
293 */
294 else {
295 /* inherit oldest/smallest lsn of page */
296 logdiff(diffp, mp->lsn, log);
297 logdiff(difft, tblk->lsn, log);
298 if (diffp < difft) {
299 /* update tblock lsn with page lsn */
300 tblk->lsn = mp->lsn;
301
302 /* move tblock after page on logsynclist */
303 list_move(&tblk->synclist, &mp->synclist);
304 }
305 }
306
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600307 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 /*
310 * write the log record
311 */
312 writeRecord:
313 lsn = lmWriteRecord(log, tblk, lrd, tlck);
314
315 /*
316 * forward log syncpt if log reached next syncpt trigger
317 */
318 logdiff(diffp, lsn, log);
319 if (diffp >= log->nextsync)
320 lsn = lmLogSync(log, 0);
321
322 /* update end-of-log lsn */
323 log->lsn = lsn;
324
325 LOG_UNLOCK(log);
326
327 /* return end-of-log address */
328 return lsn;
329}
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/*
332 * NAME: lmWriteRecord()
333 *
334 * FUNCTION: move the log record to current log page
335 *
336 * PARAMETER: cd - commit descriptor
337 *
338 * RETURN: end-of-log address
339 *
340 * serialization: LOG_LOCK() held on entry/exit
341 */
342static int
343lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
344 struct tlock * tlck)
345{
346 int lsn = 0; /* end-of-log address */
347 struct lbuf *bp; /* dst log page buffer */
348 struct logpage *lp; /* dst log page */
349 caddr_t dst; /* destination address in log page */
350 int dstoffset; /* end-of-log offset in log page */
351 int freespace; /* free space in log page */
352 caddr_t p; /* src meta-data page */
353 caddr_t src;
354 int srclen;
355 int nbytes; /* number of bytes to move */
356 int i;
357 int len;
358 struct linelock *linelock;
359 struct lv *lv;
360 struct lvd *lvd;
361 int l2linesize;
362
363 len = 0;
364
365 /* retrieve destination log page to write */
366 bp = (struct lbuf *) log->bp;
367 lp = (struct logpage *) bp->l_ldata;
368 dstoffset = log->eor;
369
370 /* any log data to write ? */
371 if (tlck == NULL)
372 goto moveLrd;
373
374 /*
375 * move log record data
376 */
377 /* retrieve source meta-data page to log */
378 if (tlck->flag & tlckPAGELOCK) {
379 p = (caddr_t) (tlck->mp->data);
380 linelock = (struct linelock *) & tlck->lock;
381 }
382 /* retrieve source in-memory inode to log */
383 else if (tlck->flag & tlckINODELOCK) {
384 if (tlck->type & tlckDTREE)
385 p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot;
386 else
387 p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot;
388 linelock = (struct linelock *) & tlck->lock;
389 }
390#ifdef _JFS_WIP
391 else if (tlck->flag & tlckINLINELOCK) {
392
393 inlinelock = (struct inlinelock *) & tlck;
394 p = (caddr_t) & inlinelock->pxd;
395 linelock = (struct linelock *) & tlck;
396 }
397#endif /* _JFS_WIP */
398 else {
399 jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck);
400 return 0; /* Probably should trap */
401 }
402 l2linesize = linelock->l2linesize;
403
404 moveData:
405 ASSERT(linelock->index <= linelock->maxcnt);
406
407 lv = linelock->lv;
408 for (i = 0; i < linelock->index; i++, lv++) {
409 if (lv->length == 0)
410 continue;
411
412 /* is page full ? */
413 if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) {
414 /* page become full: move on to next page */
415 lmNextPage(log);
416
417 bp = log->bp;
418 lp = (struct logpage *) bp->l_ldata;
419 dstoffset = LOGPHDRSIZE;
420 }
421
422 /*
423 * move log vector data
424 */
425 src = (u8 *) p + (lv->offset << l2linesize);
426 srclen = lv->length << l2linesize;
427 len += srclen;
428 while (srclen > 0) {
429 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
430 nbytes = min(freespace, srclen);
431 dst = (caddr_t) lp + dstoffset;
432 memcpy(dst, src, nbytes);
433 dstoffset += nbytes;
434
435 /* is page not full ? */
436 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
437 break;
438
439 /* page become full: move on to next page */
440 lmNextPage(log);
441
442 bp = (struct lbuf *) log->bp;
443 lp = (struct logpage *) bp->l_ldata;
444 dstoffset = LOGPHDRSIZE;
445
446 srclen -= nbytes;
447 src += nbytes;
448 }
449
450 /*
451 * move log vector descriptor
452 */
453 len += 4;
454 lvd = (struct lvd *) ((caddr_t) lp + dstoffset);
455 lvd->offset = cpu_to_le16(lv->offset);
456 lvd->length = cpu_to_le16(lv->length);
457 dstoffset += 4;
458 jfs_info("lmWriteRecord: lv offset:%d length:%d",
459 lv->offset, lv->length);
460 }
461
462 if ((i = linelock->next)) {
463 linelock = (struct linelock *) lid_to_tlock(i);
464 goto moveData;
465 }
466
467 /*
468 * move log record descriptor
469 */
470 moveLrd:
471 lrd->length = cpu_to_le16(len);
472
473 src = (caddr_t) lrd;
474 srclen = LOGRDSIZE;
475
476 while (srclen > 0) {
477 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
478 nbytes = min(freespace, srclen);
479 dst = (caddr_t) lp + dstoffset;
480 memcpy(dst, src, nbytes);
481
482 dstoffset += nbytes;
483 srclen -= nbytes;
484
485 /* are there more to move than freespace of page ? */
486 if (srclen)
487 goto pageFull;
488
489 /*
490 * end of log record descriptor
491 */
492
493 /* update last log record eor */
494 log->eor = dstoffset;
495 bp->l_eor = dstoffset;
496 lsn = (log->page << L2LOGPSIZE) + dstoffset;
497
498 if (lrd->type & cpu_to_le16(LOG_COMMIT)) {
499 tblk->clsn = lsn;
500 jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn,
501 bp->l_eor);
502
503 INCREMENT(lmStat.commit); /* # of commit */
504
505 /*
506 * enqueue tblock for group commit:
507 *
508 * enqueue tblock of non-trivial/synchronous COMMIT
509 * at tail of group commit queue
510 * (trivial/asynchronous COMMITs are ignored by
511 * group commit.)
512 */
513 LOGGC_LOCK(log);
514
515 /* init tblock gc state */
516 tblk->flag = tblkGC_QUEUE;
517 tblk->bp = log->bp;
518 tblk->pn = log->page;
519 tblk->eor = log->eor;
520
521 /* enqueue transaction to commit queue */
522 list_add_tail(&tblk->cqueue, &log->cqueue);
523
524 LOGGC_UNLOCK(log);
525 }
526
527 jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x",
528 le16_to_cpu(lrd->type), log->bp, log->page, dstoffset);
529
530 /* page not full ? */
531 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
532 return lsn;
533
534 pageFull:
535 /* page become full: move on to next page */
536 lmNextPage(log);
537
538 bp = (struct lbuf *) log->bp;
539 lp = (struct logpage *) bp->l_ldata;
540 dstoffset = LOGPHDRSIZE;
541 src += nbytes;
542 }
543
544 return lsn;
545}
546
547
548/*
549 * NAME: lmNextPage()
550 *
551 * FUNCTION: write current page and allocate next page.
552 *
553 * PARAMETER: log
554 *
555 * RETURN: 0
556 *
557 * serialization: LOG_LOCK() held on entry/exit
558 */
559static int lmNextPage(struct jfs_log * log)
560{
561 struct logpage *lp;
562 int lspn; /* log sequence page number */
563 int pn; /* current page number */
564 struct lbuf *bp;
565 struct lbuf *nextbp;
566 struct tblock *tblk;
567
568 /* get current log page number and log sequence page number */
569 pn = log->page;
570 bp = log->bp;
571 lp = (struct logpage *) bp->l_ldata;
572 lspn = le32_to_cpu(lp->h.page);
573
574 LOGGC_LOCK(log);
575
576 /*
577 * write or queue the full page at the tail of write queue
578 */
579 /* get the tail tblk on commit queue */
580 if (list_empty(&log->cqueue))
581 tblk = NULL;
582 else
583 tblk = list_entry(log->cqueue.prev, struct tblock, cqueue);
584
585 /* every tblk who has COMMIT record on the current page,
586 * and has not been committed, must be on commit queue
587 * since tblk is queued at commit queueu at the time
588 * of writing its COMMIT record on the page before
589 * page becomes full (even though the tblk thread
590 * who wrote COMMIT record may have been suspended
591 * currently);
592 */
593
594 /* is page bound with outstanding tail tblk ? */
595 if (tblk && tblk->pn == pn) {
596 /* mark tblk for end-of-page */
597 tblk->flag |= tblkGC_EOP;
598
599 if (log->cflag & logGC_PAGEOUT) {
600 /* if page is not already on write queue,
601 * just enqueue (no lbmWRITE to prevent redrive)
602 * buffer to wqueue to ensure correct serial order
603 * of the pages since log pages will be added
604 * continuously
605 */
606 if (bp->l_wqnext == NULL)
607 lbmWrite(log, bp, 0, 0);
608 } else {
609 /*
610 * No current GC leader, initiate group commit
611 */
612 log->cflag |= logGC_PAGEOUT;
613 lmGCwrite(log, 0);
614 }
615 }
616 /* page is not bound with outstanding tblk:
617 * init write or mark it to be redriven (lbmWRITE)
618 */
619 else {
620 /* finalize the page */
621 bp->l_ceor = bp->l_eor;
622 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
623 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0);
624 }
625 LOGGC_UNLOCK(log);
626
627 /*
628 * allocate/initialize next page
629 */
630 /* if log wraps, the first data page of log is 2
631 * (0 never used, 1 is superblock).
632 */
633 log->page = (pn == log->size - 1) ? 2 : pn + 1;
634 log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */
635
636 /* allocate/initialize next log page buffer */
637 nextbp = lbmAllocate(log, log->page);
638 nextbp->l_eor = log->eor;
639 log->bp = nextbp;
640
641 /* initialize next log page */
642 lp = (struct logpage *) nextbp->l_ldata;
643 lp->h.page = lp->t.page = cpu_to_le32(lspn + 1);
644 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
645
646 return 0;
647}
648
649
650/*
651 * NAME: lmGroupCommit()
652 *
653 * FUNCTION: group commit
654 * initiate pageout of the pages with COMMIT in the order of
655 * page number - redrive pageout of the page at the head of
656 * pageout queue until full page has been written.
657 *
658 * RETURN:
659 *
660 * NOTE:
661 * LOGGC_LOCK serializes log group commit queue, and
662 * transaction blocks on the commit queue.
663 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
664 */
665int lmGroupCommit(struct jfs_log * log, struct tblock * tblk)
666{
667 int rc = 0;
668
669 LOGGC_LOCK(log);
670
671 /* group committed already ? */
672 if (tblk->flag & tblkGC_COMMITTED) {
673 if (tblk->flag & tblkGC_ERROR)
674 rc = -EIO;
675
676 LOGGC_UNLOCK(log);
677 return rc;
678 }
679 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc);
680
681 if (tblk->xflag & COMMIT_LAZY)
682 tblk->flag |= tblkGC_LAZY;
683
684 if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) &&
685 (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag)
686 || jfs_tlocks_low)) {
687 /*
688 * No pageout in progress
689 *
690 * start group commit as its group leader.
691 */
692 log->cflag |= logGC_PAGEOUT;
693
694 lmGCwrite(log, 0);
695 }
696
697 if (tblk->xflag & COMMIT_LAZY) {
698 /*
699 * Lazy transactions can leave now
700 */
701 LOGGC_UNLOCK(log);
702 return 0;
703 }
704
705 /* lmGCwrite gives up LOGGC_LOCK, check again */
706
707 if (tblk->flag & tblkGC_COMMITTED) {
708 if (tblk->flag & tblkGC_ERROR)
709 rc = -EIO;
710
711 LOGGC_UNLOCK(log);
712 return rc;
713 }
714
715 /* upcount transaction waiting for completion
716 */
717 log->gcrtc++;
718 tblk->flag |= tblkGC_READY;
719
720 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED),
721 LOGGC_LOCK(log), LOGGC_UNLOCK(log));
722
723 /* removed from commit queue */
724 if (tblk->flag & tblkGC_ERROR)
725 rc = -EIO;
726
727 LOGGC_UNLOCK(log);
728 return rc;
729}
730
731/*
732 * NAME: lmGCwrite()
733 *
734 * FUNCTION: group commit write
735 * initiate write of log page, building a group of all transactions
736 * with commit records on that page.
737 *
738 * RETURN: None
739 *
740 * NOTE:
741 * LOGGC_LOCK must be held by caller.
742 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
743 */
744static void lmGCwrite(struct jfs_log * log, int cant_write)
745{
746 struct lbuf *bp;
747 struct logpage *lp;
748 int gcpn; /* group commit page number */
749 struct tblock *tblk;
750 struct tblock *xtblk = NULL;
751
752 /*
753 * build the commit group of a log page
754 *
755 * scan commit queue and make a commit group of all
756 * transactions with COMMIT records on the same log page.
757 */
758 /* get the head tblk on the commit queue */
759 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn;
760
761 list_for_each_entry(tblk, &log->cqueue, cqueue) {
762 if (tblk->pn != gcpn)
763 break;
764
765 xtblk = tblk;
766
767 /* state transition: (QUEUE, READY) -> COMMIT */
768 tblk->flag |= tblkGC_COMMIT;
769 }
770 tblk = xtblk; /* last tblk of the page */
771
772 /*
773 * pageout to commit transactions on the log page.
774 */
775 bp = (struct lbuf *) tblk->bp;
776 lp = (struct logpage *) bp->l_ldata;
777 /* is page already full ? */
778 if (tblk->flag & tblkGC_EOP) {
779 /* mark page to free at end of group commit of the page */
780 tblk->flag &= ~tblkGC_EOP;
781 tblk->flag |= tblkGC_FREE;
782 bp->l_ceor = bp->l_eor;
783 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
784 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC,
785 cant_write);
786 INCREMENT(lmStat.full_page);
787 }
788 /* page is not yet full */
789 else {
790 bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */
791 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
792 lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write);
793 INCREMENT(lmStat.partial_page);
794 }
795}
796
797/*
798 * NAME: lmPostGC()
799 *
800 * FUNCTION: group commit post-processing
801 * Processes transactions after their commit records have been written
802 * to disk, redriving log I/O if necessary.
803 *
804 * RETURN: None
805 *
806 * NOTE:
807 * This routine is called a interrupt time by lbmIODone
808 */
809static void lmPostGC(struct lbuf * bp)
810{
811 unsigned long flags;
812 struct jfs_log *log = bp->l_log;
813 struct logpage *lp;
814 struct tblock *tblk, *temp;
815
816 //LOGGC_LOCK(log);
817 spin_lock_irqsave(&log->gclock, flags);
818 /*
819 * current pageout of group commit completed.
820 *
821 * remove/wakeup transactions from commit queue who were
822 * group committed with the current log page
823 */
824 list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) {
825 if (!(tblk->flag & tblkGC_COMMIT))
826 break;
827 /* if transaction was marked GC_COMMIT then
828 * it has been shipped in the current pageout
829 * and made it to disk - it is committed.
830 */
831
832 if (bp->l_flag & lbmERROR)
833 tblk->flag |= tblkGC_ERROR;
834
835 /* remove it from the commit queue */
836 list_del(&tblk->cqueue);
837 tblk->flag &= ~tblkGC_QUEUE;
838
839 if (tblk == log->flush_tblk) {
840 /* we can stop flushing the log now */
841 clear_bit(log_FLUSH, &log->flag);
842 log->flush_tblk = NULL;
843 }
844
845 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk,
846 tblk->flag);
847
848 if (!(tblk->xflag & COMMIT_FORCE))
849 /*
850 * Hand tblk over to lazy commit thread
851 */
852 txLazyUnlock(tblk);
853 else {
854 /* state transition: COMMIT -> COMMITTED */
855 tblk->flag |= tblkGC_COMMITTED;
856
857 if (tblk->flag & tblkGC_READY)
858 log->gcrtc--;
859
860 LOGGC_WAKEUP(tblk);
861 }
862
863 /* was page full before pageout ?
864 * (and this is the last tblk bound with the page)
865 */
866 if (tblk->flag & tblkGC_FREE)
867 lbmFree(bp);
868 /* did page become full after pageout ?
869 * (and this is the last tblk bound with the page)
870 */
871 else if (tblk->flag & tblkGC_EOP) {
872 /* finalize the page */
873 lp = (struct logpage *) bp->l_ldata;
874 bp->l_ceor = bp->l_eor;
875 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
876 jfs_info("lmPostGC: calling lbmWrite");
877 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE,
878 1);
879 }
880
881 }
882
883 /* are there any transactions who have entered lnGroupCommit()
884 * (whose COMMITs are after that of the last log page written.
885 * They are waiting for new group commit (above at (SLEEP 1))
886 * or lazy transactions are on a full (queued) log page,
887 * select the latest ready transaction as new group leader and
888 * wake her up to lead her group.
889 */
890 if ((!list_empty(&log->cqueue)) &&
891 ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) ||
892 test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low))
893 /*
894 * Call lmGCwrite with new group leader
895 */
896 lmGCwrite(log, 1);
897
898 /* no transaction are ready yet (transactions are only just
899 * queued (GC_QUEUE) and not entered for group commit yet).
900 * the first transaction entering group commit
901 * will elect herself as new group leader.
902 */
903 else
904 log->cflag &= ~logGC_PAGEOUT;
905
906 //LOGGC_UNLOCK(log);
907 spin_unlock_irqrestore(&log->gclock, flags);
908 return;
909}
910
911/*
912 * NAME: lmLogSync()
913 *
914 * FUNCTION: write log SYNCPT record for specified log
915 * if new sync address is available
916 * (normally the case if sync() is executed by back-ground
917 * process).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 * calculate new value of i_nextsync which determines when
919 * this code is called again.
920 *
Dave Kleikamp1c627822005-05-02 12:25:08 -0600921 * PARAMETERS: log - log structure
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500922 * hard_sync - 1 to force all metadata to be written
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 *
924 * RETURN: 0
925 *
926 * serialization: LOG_LOCK() held on entry/exit
927 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500928static int lmLogSync(struct jfs_log * log, int hard_sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
930 int logsize;
931 int written; /* written since last syncpt */
932 int free; /* free space left available */
933 int delta; /* additional delta to write normally */
934 int more; /* additional write granted */
935 struct lrd lrd;
936 int lsn;
937 struct logsyncblk *lp;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600938 struct jfs_sb_info *sbi;
939 unsigned long flags;
940
941 /* push dirty metapages out to disk */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500942 if (hard_sync)
943 list_for_each_entry(sbi, &log->sb_list, log_list) {
944 filemap_fdatawrite(sbi->ipbmap->i_mapping);
945 filemap_fdatawrite(sbi->ipimap->i_mapping);
946 filemap_fdatawrite(sbi->direct_inode->i_mapping);
947 }
948 else
949 list_for_each_entry(sbi, &log->sb_list, log_list) {
950 filemap_flush(sbi->ipbmap->i_mapping);
951 filemap_flush(sbi->ipimap->i_mapping);
952 filemap_flush(sbi->direct_inode->i_mapping);
953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
955 /*
956 * forward syncpt
957 */
958 /* if last sync is same as last syncpt,
959 * invoke sync point forward processing to update sync.
960 */
961
962 if (log->sync == log->syncpt) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600963 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 if (list_empty(&log->synclist))
965 log->sync = log->lsn;
966 else {
967 lp = list_entry(log->synclist.next,
968 struct logsyncblk, synclist);
969 log->sync = lp->lsn;
970 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600971 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
973 }
974
975 /* if sync is different from last syncpt,
976 * write a SYNCPT record with syncpt = sync.
977 * reset syncpt = sync
978 */
979 if (log->sync != log->syncpt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 lrd.logtid = 0;
981 lrd.backchain = 0;
982 lrd.type = cpu_to_le16(LOG_SYNCPT);
983 lrd.length = 0;
984 lrd.log.syncpt.sync = cpu_to_le32(log->sync);
985 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
986
987 log->syncpt = log->sync;
988 } else
989 lsn = log->lsn;
990
991 /*
992 * setup next syncpt trigger (SWAG)
993 */
994 logsize = log->logsize;
995
996 logdiff(written, lsn, log);
997 free = logsize - written;
998 delta = LOGSYNC_DELTA(logsize);
999 more = min(free / 2, delta);
1000 if (more < 2 * LOGPSIZE) {
1001 jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n");
1002 /*
1003 * log wrapping
1004 *
1005 * option 1 - panic ? No.!
1006 * option 2 - shutdown file systems
1007 * associated with log ?
1008 * option 3 - extend log ?
1009 */
1010 /*
1011 * option 4 - second chance
1012 *
1013 * mark log wrapped, and continue.
1014 * when all active transactions are completed,
1015 * mark log vaild for recovery.
1016 * if crashed during invalid state, log state
1017 * implies invald log, forcing fsck().
1018 */
1019 /* mark log state log wrap in log superblock */
1020 /* log->state = LOGWRAP; */
1021
1022 /* reset sync point computation */
1023 log->syncpt = log->sync = lsn;
1024 log->nextsync = delta;
1025 } else
1026 /* next syncpt trigger = written + more */
1027 log->nextsync = written + more;
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 /* if number of bytes written from last sync point is more
1030 * than 1/4 of the log size, stop new transactions from
1031 * starting until all current transactions are completed
1032 * by setting syncbarrier flag.
1033 */
Dave Kleikampc2783f32005-07-25 08:58:54 -05001034 if (!test_bit(log_SYNCBARRIER, &log->flag) &&
1035 (written > LOGSYNC_BARRIER(logsize)) && log->active) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 set_bit(log_SYNCBARRIER, &log->flag);
1037 jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn,
1038 log->syncpt);
1039 /*
1040 * We may have to initiate group commit
1041 */
1042 jfs_flush_journal(log, 0);
1043 }
1044
1045 return lsn;
1046}
1047
Dave Kleikamp1c627822005-05-02 12:25:08 -06001048/*
1049 * NAME: jfs_syncpt
1050 *
1051 * FUNCTION: write log SYNCPT record for specified log
1052 *
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001053 * PARAMETERS: log - log structure
1054 * hard_sync - set to 1 to force metadata to be written
Dave Kleikamp1c627822005-05-02 12:25:08 -06001055 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001056void jfs_syncpt(struct jfs_log *log, int hard_sync)
Dave Kleikamp1c627822005-05-02 12:25:08 -06001057{ LOG_LOCK(log);
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001058 lmLogSync(log, hard_sync);
Dave Kleikamp1c627822005-05-02 12:25:08 -06001059 LOG_UNLOCK(log);
1060}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062/*
1063 * NAME: lmLogOpen()
1064 *
1065 * FUNCTION: open the log on first open;
1066 * insert filesystem in the active list of the log.
1067 *
1068 * PARAMETER: ipmnt - file system mount inode
1069 * iplog - log inode (out)
1070 *
1071 * RETURN:
1072 *
1073 * serialization:
1074 */
1075int lmLogOpen(struct super_block *sb)
1076{
1077 int rc;
1078 struct block_device *bdev;
1079 struct jfs_log *log;
1080 struct jfs_sb_info *sbi = JFS_SBI(sb);
1081
1082 if (sbi->flag & JFS_NOINTEGRITY)
1083 return open_dummy_log(sb);
1084
1085 if (sbi->mntflag & JFS_INLINELOG)
1086 return open_inline_log(sb);
1087
1088 down(&jfs_log_sem);
1089 list_for_each_entry(log, &jfs_external_logs, journal_list) {
1090 if (log->bdev->bd_dev == sbi->logdev) {
1091 if (memcmp(log->uuid, sbi->loguuid,
1092 sizeof(log->uuid))) {
1093 jfs_warn("wrong uuid on JFS journal\n");
1094 up(&jfs_log_sem);
1095 return -EINVAL;
1096 }
1097 /*
1098 * add file system to log active file system list
1099 */
1100 if ((rc = lmLogFileSystem(log, sbi, 1))) {
1101 up(&jfs_log_sem);
1102 return rc;
1103 }
1104 goto journal_found;
1105 }
1106 }
1107
1108 if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
1109 up(&jfs_log_sem);
1110 return -ENOMEM;
1111 }
1112 memset(log, 0, sizeof(struct jfs_log));
1113 INIT_LIST_HEAD(&log->sb_list);
1114 init_waitqueue_head(&log->syncwait);
1115
1116 /*
1117 * external log as separate logical volume
1118 *
1119 * file systems to log may have n-to-1 relationship;
1120 */
1121
1122 bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE);
1123 if (IS_ERR(bdev)) {
1124 rc = -PTR_ERR(bdev);
1125 goto free;
1126 }
1127
1128 if ((rc = bd_claim(bdev, log))) {
1129 goto close;
1130 }
1131
1132 log->bdev = bdev;
1133 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
1134
1135 /*
1136 * initialize log:
1137 */
1138 if ((rc = lmLogInit(log)))
1139 goto unclaim;
1140
1141 list_add(&log->journal_list, &jfs_external_logs);
1142
1143 /*
1144 * add file system to log active file system list
1145 */
1146 if ((rc = lmLogFileSystem(log, sbi, 1)))
1147 goto shutdown;
1148
1149journal_found:
1150 LOG_LOCK(log);
1151 list_add(&sbi->log_list, &log->sb_list);
1152 sbi->log = log;
1153 LOG_UNLOCK(log);
1154
1155 up(&jfs_log_sem);
1156 return 0;
1157
1158 /*
1159 * unwind on error
1160 */
1161 shutdown: /* unwind lbmLogInit() */
1162 list_del(&log->journal_list);
1163 lbmLogShutdown(log);
1164
1165 unclaim:
1166 bd_release(bdev);
1167
1168 close: /* close external log device */
1169 blkdev_put(bdev);
1170
1171 free: /* free log descriptor */
1172 up(&jfs_log_sem);
1173 kfree(log);
1174
1175 jfs_warn("lmLogOpen: exit(%d)", rc);
1176 return rc;
1177}
1178
1179static int open_inline_log(struct super_block *sb)
1180{
1181 struct jfs_log *log;
1182 int rc;
1183
1184 if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL)))
1185 return -ENOMEM;
1186 memset(log, 0, sizeof(struct jfs_log));
1187 INIT_LIST_HEAD(&log->sb_list);
1188 init_waitqueue_head(&log->syncwait);
1189
1190 set_bit(log_INLINELOG, &log->flag);
1191 log->bdev = sb->s_bdev;
1192 log->base = addressPXD(&JFS_SBI(sb)->logpxd);
1193 log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >>
1194 (L2LOGPSIZE - sb->s_blocksize_bits);
1195 log->l2bsize = sb->s_blocksize_bits;
1196 ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits);
1197
1198 /*
1199 * initialize log.
1200 */
1201 if ((rc = lmLogInit(log))) {
1202 kfree(log);
1203 jfs_warn("lmLogOpen: exit(%d)", rc);
1204 return rc;
1205 }
1206
1207 list_add(&JFS_SBI(sb)->log_list, &log->sb_list);
1208 JFS_SBI(sb)->log = log;
1209
1210 return rc;
1211}
1212
1213static int open_dummy_log(struct super_block *sb)
1214{
1215 int rc;
1216
1217 down(&jfs_log_sem);
1218 if (!dummy_log) {
1219 dummy_log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL);
1220 if (!dummy_log) {
1221 up(&jfs_log_sem);
1222 return -ENOMEM;
1223 }
1224 memset(dummy_log, 0, sizeof(struct jfs_log));
1225 INIT_LIST_HEAD(&dummy_log->sb_list);
1226 init_waitqueue_head(&dummy_log->syncwait);
1227 dummy_log->no_integrity = 1;
1228 /* Make up some stuff */
1229 dummy_log->base = 0;
1230 dummy_log->size = 1024;
1231 rc = lmLogInit(dummy_log);
1232 if (rc) {
1233 kfree(dummy_log);
1234 dummy_log = NULL;
1235 up(&jfs_log_sem);
1236 return rc;
1237 }
1238 }
1239
1240 LOG_LOCK(dummy_log);
1241 list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list);
1242 JFS_SBI(sb)->log = dummy_log;
1243 LOG_UNLOCK(dummy_log);
1244 up(&jfs_log_sem);
1245
1246 return 0;
1247}
1248
1249/*
1250 * NAME: lmLogInit()
1251 *
1252 * FUNCTION: log initialization at first log open.
1253 *
1254 * logredo() (or logformat()) should have been run previously.
1255 * initialize the log from log superblock.
1256 * set the log state in the superblock to LOGMOUNT and
1257 * write SYNCPT log record.
1258 *
1259 * PARAMETER: log - log structure
1260 *
1261 * RETURN: 0 - if ok
1262 * -EINVAL - bad log magic number or superblock dirty
1263 * error returned from logwait()
1264 *
1265 * serialization: single first open thread
1266 */
1267int lmLogInit(struct jfs_log * log)
1268{
1269 int rc = 0;
1270 struct lrd lrd;
1271 struct logsuper *logsuper;
1272 struct lbuf *bpsuper;
1273 struct lbuf *bp;
1274 struct logpage *lp;
1275 int lsn = 0;
1276
1277 jfs_info("lmLogInit: log:0x%p", log);
1278
1279 /* initialize the group commit serialization lock */
1280 LOGGC_LOCK_INIT(log);
1281
1282 /* allocate/initialize the log write serialization lock */
1283 LOG_LOCK_INIT(log);
1284
1285 LOGSYNC_LOCK_INIT(log);
1286
1287 INIT_LIST_HEAD(&log->synclist);
1288
1289 INIT_LIST_HEAD(&log->cqueue);
1290 log->flush_tblk = NULL;
1291
1292 log->count = 0;
1293
1294 /*
1295 * initialize log i/o
1296 */
1297 if ((rc = lbmLogInit(log)))
1298 return rc;
1299
1300 if (!test_bit(log_INLINELOG, &log->flag))
1301 log->l2bsize = L2LOGPSIZE;
1302
1303 /* check for disabled journaling to disk */
1304 if (log->no_integrity) {
1305 /*
1306 * Journal pages will still be filled. When the time comes
1307 * to actually do the I/O, the write is not done, and the
1308 * endio routine is called directly.
1309 */
1310 bp = lbmAllocate(log , 0);
1311 log->bp = bp;
1312 bp->l_pn = bp->l_eor = 0;
1313 } else {
1314 /*
1315 * validate log superblock
1316 */
1317 if ((rc = lbmRead(log, 1, &bpsuper)))
1318 goto errout10;
1319
1320 logsuper = (struct logsuper *) bpsuper->l_ldata;
1321
1322 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) {
1323 jfs_warn("*** Log Format Error ! ***");
1324 rc = -EINVAL;
1325 goto errout20;
1326 }
1327
1328 /* logredo() should have been run successfully. */
1329 if (logsuper->state != cpu_to_le32(LOGREDONE)) {
1330 jfs_warn("*** Log Is Dirty ! ***");
1331 rc = -EINVAL;
1332 goto errout20;
1333 }
1334
1335 /* initialize log from log superblock */
1336 if (test_bit(log_INLINELOG,&log->flag)) {
1337 if (log->size != le32_to_cpu(logsuper->size)) {
1338 rc = -EINVAL;
1339 goto errout20;
1340 }
1341 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx "
1342 "size:0x%x", log,
1343 (unsigned long long) log->base, log->size);
1344 } else {
1345 if (memcmp(logsuper->uuid, log->uuid, 16)) {
1346 jfs_warn("wrong uuid on JFS log device");
1347 goto errout20;
1348 }
1349 log->size = le32_to_cpu(logsuper->size);
1350 log->l2bsize = le32_to_cpu(logsuper->l2bsize);
1351 jfs_info("lmLogInit: external log:0x%p base:0x%Lx "
1352 "size:0x%x", log,
1353 (unsigned long long) log->base, log->size);
1354 }
1355
1356 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
1357 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
1358
1359 /*
1360 * initialize for log append write mode
1361 */
1362 /* establish current/end-of-log page/buffer */
1363 if ((rc = lbmRead(log, log->page, &bp)))
1364 goto errout20;
1365
1366 lp = (struct logpage *) bp->l_ldata;
1367
1368 jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d",
1369 le32_to_cpu(logsuper->end), log->page, log->eor,
1370 le16_to_cpu(lp->h.eor));
1371
1372 log->bp = bp;
1373 bp->l_pn = log->page;
1374 bp->l_eor = log->eor;
1375
1376 /* if current page is full, move on to next page */
1377 if (log->eor >= LOGPSIZE - LOGPTLRSIZE)
1378 lmNextPage(log);
1379
1380 /*
1381 * initialize log syncpoint
1382 */
1383 /*
1384 * write the first SYNCPT record with syncpoint = 0
1385 * (i.e., log redo up to HERE !);
1386 * remove current page from lbm write queue at end of pageout
1387 * (to write log superblock update), but do not release to
1388 * freelist;
1389 */
1390 lrd.logtid = 0;
1391 lrd.backchain = 0;
1392 lrd.type = cpu_to_le16(LOG_SYNCPT);
1393 lrd.length = 0;
1394 lrd.log.syncpt.sync = 0;
1395 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1396 bp = log->bp;
1397 bp->l_ceor = bp->l_eor;
1398 lp = (struct logpage *) bp->l_ldata;
1399 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1400 lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0);
1401 if ((rc = lbmIOWait(bp, 0)))
1402 goto errout30;
1403
1404 /*
1405 * update/write superblock
1406 */
1407 logsuper->state = cpu_to_le32(LOGMOUNT);
1408 log->serial = le32_to_cpu(logsuper->serial) + 1;
1409 logsuper->serial = cpu_to_le32(log->serial);
1410 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1411 if ((rc = lbmIOWait(bpsuper, lbmFREE)))
1412 goto errout30;
1413 }
1414
1415 /* initialize logsync parameters */
1416 log->logsize = (log->size - 2) << L2LOGPSIZE;
1417 log->lsn = lsn;
1418 log->syncpt = lsn;
1419 log->sync = log->syncpt;
1420 log->nextsync = LOGSYNC_DELTA(log->logsize);
1421
1422 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x",
1423 log->lsn, log->syncpt, log->sync);
1424
1425 /*
1426 * initialize for lazy/group commit
1427 */
1428 log->clsn = lsn;
1429
1430 return 0;
1431
1432 /*
1433 * unwind on error
1434 */
1435 errout30: /* release log page */
1436 log->wqueue = NULL;
1437 bp->l_wqnext = NULL;
1438 lbmFree(bp);
1439
1440 errout20: /* release log superblock */
1441 lbmFree(bpsuper);
1442
1443 errout10: /* unwind lbmLogInit() */
1444 lbmLogShutdown(log);
1445
1446 jfs_warn("lmLogInit: exit(%d)", rc);
1447 return rc;
1448}
1449
1450
1451/*
1452 * NAME: lmLogClose()
1453 *
1454 * FUNCTION: remove file system <ipmnt> from active list of log <iplog>
1455 * and close it on last close.
1456 *
1457 * PARAMETER: sb - superblock
1458 *
1459 * RETURN: errors from subroutines
1460 *
1461 * serialization:
1462 */
1463int lmLogClose(struct super_block *sb)
1464{
1465 struct jfs_sb_info *sbi = JFS_SBI(sb);
1466 struct jfs_log *log = sbi->log;
1467 struct block_device *bdev;
1468 int rc = 0;
1469
1470 jfs_info("lmLogClose: log:0x%p", log);
1471
1472 down(&jfs_log_sem);
1473 LOG_LOCK(log);
1474 list_del(&sbi->log_list);
1475 LOG_UNLOCK(log);
1476 sbi->log = NULL;
1477
1478 /*
1479 * We need to make sure all of the "written" metapages
1480 * actually make it to disk
1481 */
1482 sync_blockdev(sb->s_bdev);
1483
1484 if (test_bit(log_INLINELOG, &log->flag)) {
1485 /*
1486 * in-line log in host file system
1487 */
1488 rc = lmLogShutdown(log);
1489 kfree(log);
1490 goto out;
1491 }
1492
1493 if (!log->no_integrity)
1494 lmLogFileSystem(log, sbi, 0);
1495
1496 if (!list_empty(&log->sb_list))
1497 goto out;
1498
1499 /*
1500 * TODO: ensure that the dummy_log is in a state to allow
1501 * lbmLogShutdown to deallocate all the buffers and call
1502 * kfree against dummy_log. For now, leave dummy_log & its
1503 * buffers in memory, and resuse if another no-integrity mount
1504 * is requested.
1505 */
1506 if (log->no_integrity)
1507 goto out;
1508
1509 /*
1510 * external log as separate logical volume
1511 */
1512 list_del(&log->journal_list);
1513 bdev = log->bdev;
1514 rc = lmLogShutdown(log);
1515
1516 bd_release(bdev);
1517 blkdev_put(bdev);
1518
1519 kfree(log);
1520
1521 out:
1522 up(&jfs_log_sem);
1523 jfs_info("lmLogClose: exit(%d)", rc);
1524 return rc;
1525}
1526
1527
1528/*
1529 * NAME: jfs_flush_journal()
1530 *
1531 * FUNCTION: initiate write of any outstanding transactions to the journal
1532 * and optionally wait until they are all written to disk
1533 *
1534 * wait == 0 flush until latest txn is committed, don't wait
1535 * wait == 1 flush until latest txn is committed, wait
1536 * wait > 1 flush until all txn's are complete, wait
1537 */
1538void jfs_flush_journal(struct jfs_log *log, int wait)
1539{
1540 int i;
1541 struct tblock *target = NULL;
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001542 struct jfs_sb_info *sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
1544 /* jfs_write_inode may call us during read-only mount */
1545 if (!log)
1546 return;
1547
1548 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait);
1549
1550 LOGGC_LOCK(log);
1551
1552 if (!list_empty(&log->cqueue)) {
1553 /*
1554 * This ensures that we will keep writing to the journal as long
1555 * as there are unwritten commit records
1556 */
1557 target = list_entry(log->cqueue.prev, struct tblock, cqueue);
1558
1559 if (test_bit(log_FLUSH, &log->flag)) {
1560 /*
1561 * We're already flushing.
1562 * if flush_tblk is NULL, we are flushing everything,
1563 * so leave it that way. Otherwise, update it to the
1564 * latest transaction
1565 */
1566 if (log->flush_tblk)
1567 log->flush_tblk = target;
1568 } else {
1569 /* Only flush until latest transaction is committed */
1570 log->flush_tblk = target;
1571 set_bit(log_FLUSH, &log->flag);
1572
1573 /*
1574 * Initiate I/O on outstanding transactions
1575 */
1576 if (!(log->cflag & logGC_PAGEOUT)) {
1577 log->cflag |= logGC_PAGEOUT;
1578 lmGCwrite(log, 0);
1579 }
1580 }
1581 }
1582 if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) {
1583 /* Flush until all activity complete */
1584 set_bit(log_FLUSH, &log->flag);
1585 log->flush_tblk = NULL;
1586 }
1587
1588 if (wait && target && !(target->flag & tblkGC_COMMITTED)) {
1589 DECLARE_WAITQUEUE(__wait, current);
1590
1591 add_wait_queue(&target->gcwait, &__wait);
1592 set_current_state(TASK_UNINTERRUPTIBLE);
1593 LOGGC_UNLOCK(log);
1594 schedule();
1595 current->state = TASK_RUNNING;
1596 LOGGC_LOCK(log);
1597 remove_wait_queue(&target->gcwait, &__wait);
1598 }
1599 LOGGC_UNLOCK(log);
1600
1601 if (wait < 2)
1602 return;
1603
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001604 list_for_each_entry(sbi, &log->sb_list, log_list) {
1605 filemap_fdatawrite(sbi->ipbmap->i_mapping);
1606 filemap_fdatawrite(sbi->ipimap->i_mapping);
1607 filemap_fdatawrite(sbi->direct_inode->i_mapping);
1608 }
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 /*
1611 * If there was recent activity, we may need to wait
1612 * for the lazycommit thread to catch up
1613 */
1614 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001615 for (i = 0; i < 200; i++) { /* Too much? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 msleep(250);
1617 if (list_empty(&log->cqueue) &&
1618 list_empty(&log->synclist))
1619 break;
1620 }
1621 }
1622 assert(list_empty(&log->cqueue));
Dave Kleikamp72e31482005-06-03 14:09:54 -05001623
1624#ifdef CONFIG_JFS_DEBUG
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001625 if (!list_empty(&log->synclist)) {
1626 struct logsyncblk *lp;
1627
1628 list_for_each_entry(lp, &log->synclist, synclist) {
1629 if (lp->xflag & COMMIT_PAGE) {
1630 struct metapage *mp = (struct metapage *)lp;
1631 dump_mem("orphan metapage", lp,
1632 sizeof(struct metapage));
1633 dump_mem("page", mp->page, sizeof(struct page));
1634 }
1635 else
1636 dump_mem("orphan tblock", lp,
1637 sizeof(struct tblock));
1638 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001639 }
Dave Kleikamp72e31482005-06-03 14:09:54 -05001640#endif
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001641 //assert(list_empty(&log->synclist));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 clear_bit(log_FLUSH, &log->flag);
1643}
1644
1645/*
1646 * NAME: lmLogShutdown()
1647 *
1648 * FUNCTION: log shutdown at last LogClose().
1649 *
1650 * write log syncpt record.
1651 * update super block to set redone flag to 0.
1652 *
1653 * PARAMETER: log - log inode
1654 *
1655 * RETURN: 0 - success
1656 *
1657 * serialization: single last close thread
1658 */
1659int lmLogShutdown(struct jfs_log * log)
1660{
1661 int rc;
1662 struct lrd lrd;
1663 int lsn;
1664 struct logsuper *logsuper;
1665 struct lbuf *bpsuper;
1666 struct lbuf *bp;
1667 struct logpage *lp;
1668
1669 jfs_info("lmLogShutdown: log:0x%p", log);
1670
1671 jfs_flush_journal(log, 2);
1672
1673 /*
1674 * write the last SYNCPT record with syncpoint = 0
1675 * (i.e., log redo up to HERE !)
1676 */
1677 lrd.logtid = 0;
1678 lrd.backchain = 0;
1679 lrd.type = cpu_to_le16(LOG_SYNCPT);
1680 lrd.length = 0;
1681 lrd.log.syncpt.sync = 0;
1682
1683 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1684 bp = log->bp;
1685 lp = (struct logpage *) bp->l_ldata;
1686 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1687 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
1688 lbmIOWait(log->bp, lbmFREE);
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001689 log->bp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690
1691 /*
1692 * synchronous update log superblock
1693 * mark log state as shutdown cleanly
1694 * (i.e., Log does not need to be replayed).
1695 */
1696 if ((rc = lbmRead(log, 1, &bpsuper)))
1697 goto out;
1698
1699 logsuper = (struct logsuper *) bpsuper->l_ldata;
1700 logsuper->state = cpu_to_le32(LOGREDONE);
1701 logsuper->end = cpu_to_le32(lsn);
1702 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1703 rc = lbmIOWait(bpsuper, lbmFREE);
1704
1705 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1706 lsn, log->page, log->eor);
1707
1708 out:
1709 /*
1710 * shutdown per log i/o
1711 */
1712 lbmLogShutdown(log);
1713
1714 if (rc) {
1715 jfs_warn("lmLogShutdown: exit(%d)", rc);
1716 }
1717 return rc;
1718}
1719
1720
1721/*
1722 * NAME: lmLogFileSystem()
1723 *
1724 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1725 * file system into/from log active file system list.
1726 *
1727 * PARAMETE: log - pointer to logs inode.
1728 * fsdev - kdev_t of filesystem.
1729 * serial - pointer to returned log serial number
1730 * activate - insert/remove device from active list.
1731 *
1732 * RETURN: 0 - success
1733 * errors returned by vms_iowait().
1734 */
1735static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1736 int activate)
1737{
1738 int rc = 0;
1739 int i;
1740 struct logsuper *logsuper;
1741 struct lbuf *bpsuper;
1742 char *uuid = sbi->uuid;
1743
1744 /*
1745 * insert/remove file system device to log active file system list.
1746 */
1747 if ((rc = lbmRead(log, 1, &bpsuper)))
1748 return rc;
1749
1750 logsuper = (struct logsuper *) bpsuper->l_ldata;
1751 if (activate) {
1752 for (i = 0; i < MAX_ACTIVE; i++)
1753 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
1754 memcpy(logsuper->active[i].uuid, uuid, 16);
1755 sbi->aggregate = i;
1756 break;
1757 }
1758 if (i == MAX_ACTIVE) {
1759 jfs_warn("Too many file systems sharing journal!");
1760 lbmFree(bpsuper);
1761 return -EMFILE; /* Is there a better rc? */
1762 }
1763 } else {
1764 for (i = 0; i < MAX_ACTIVE; i++)
1765 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
1766 memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
1767 break;
1768 }
1769 if (i == MAX_ACTIVE) {
1770 jfs_warn("Somebody stomped on the journal!");
1771 lbmFree(bpsuper);
1772 return -EIO;
1773 }
1774
1775 }
1776
1777 /*
1778 * synchronous write log superblock:
1779 *
1780 * write sidestream bypassing write queue:
1781 * at file system mount, log super block is updated for
1782 * activation of the file system before any log record
1783 * (MOUNT record) of the file system, and at file system
1784 * unmount, all meta data for the file system has been
1785 * flushed before log super block is updated for deactivation
1786 * of the file system.
1787 */
1788 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1789 rc = lbmIOWait(bpsuper, lbmFREE);
1790
1791 return rc;
1792}
1793
1794/*
1795 * log buffer manager (lbm)
1796 * ------------------------
1797 *
1798 * special purpose buffer manager supporting log i/o requirements.
1799 *
1800 * per log write queue:
1801 * log pageout occurs in serial order by fifo write queue and
1802 * restricting to a single i/o in pregress at any one time.
1803 * a circular singly-linked list
1804 * (log->wrqueue points to the tail, and buffers are linked via
1805 * bp->wrqueue field), and
1806 * maintains log page in pageout ot waiting for pageout in serial pageout.
1807 */
1808
1809/*
1810 * lbmLogInit()
1811 *
1812 * initialize per log I/O setup at lmLogInit()
1813 */
1814static int lbmLogInit(struct jfs_log * log)
1815{ /* log inode */
1816 int i;
1817 struct lbuf *lbuf;
1818
1819 jfs_info("lbmLogInit: log:0x%p", log);
1820
1821 /* initialize current buffer cursor */
1822 log->bp = NULL;
1823
1824 /* initialize log device write queue */
1825 log->wqueue = NULL;
1826
1827 /*
1828 * Each log has its own buffer pages allocated to it. These are
1829 * not managed by the page cache. This ensures that a transaction
1830 * writing to the log does not block trying to allocate a page from
1831 * the page cache (for the log). This would be bad, since page
1832 * allocation waits on the kswapd thread that may be committing inodes
1833 * which would cause log activity. Was that clear? I'm trying to
1834 * avoid deadlock here.
1835 */
1836 init_waitqueue_head(&log->free_wait);
1837
1838 log->lbuf_free = NULL;
1839
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001840 for (i = 0; i < LOGPAGES;) {
1841 char *buffer;
1842 uint offset;
1843 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001845 buffer = (char *) get_zeroed_page(GFP_KERNEL);
1846 if (buffer == NULL)
1847 goto error;
1848 page = virt_to_page(buffer);
1849 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
1850 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
1851 if (lbuf == NULL) {
1852 if (offset == 0)
1853 free_page((unsigned long) buffer);
1854 goto error;
1855 }
1856 if (offset) /* we already have one reference */
1857 get_page(page);
1858 lbuf->l_offset = offset;
1859 lbuf->l_ldata = buffer + offset;
1860 lbuf->l_page = page;
1861 lbuf->l_log = log;
1862 init_waitqueue_head(&lbuf->l_ioevent);
1863
1864 lbuf->l_freelist = log->lbuf_free;
1865 log->lbuf_free = lbuf;
1866 i++;
1867 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 }
1869
1870 return (0);
1871
1872 error:
1873 lbmLogShutdown(log);
1874 return -ENOMEM;
1875}
1876
1877
1878/*
1879 * lbmLogShutdown()
1880 *
1881 * finalize per log I/O setup at lmLogShutdown()
1882 */
1883static void lbmLogShutdown(struct jfs_log * log)
1884{
1885 struct lbuf *lbuf;
1886
1887 jfs_info("lbmLogShutdown: log:0x%p", log);
1888
1889 lbuf = log->lbuf_free;
1890 while (lbuf) {
1891 struct lbuf *next = lbuf->l_freelist;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001892 __free_page(lbuf->l_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 kfree(lbuf);
1894 lbuf = next;
1895 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896}
1897
1898
1899/*
1900 * lbmAllocate()
1901 *
1902 * allocate an empty log buffer
1903 */
1904static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1905{
1906 struct lbuf *bp;
1907 unsigned long flags;
1908
1909 /*
1910 * recycle from log buffer freelist if any
1911 */
1912 LCACHE_LOCK(flags);
1913 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags);
1914 log->lbuf_free = bp->l_freelist;
1915 LCACHE_UNLOCK(flags);
1916
1917 bp->l_flag = 0;
1918
1919 bp->l_wqnext = NULL;
1920 bp->l_freelist = NULL;
1921
1922 bp->l_pn = pn;
1923 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1924 bp->l_ceor = 0;
1925
1926 return bp;
1927}
1928
1929
1930/*
1931 * lbmFree()
1932 *
1933 * release a log buffer to freelist
1934 */
1935static void lbmFree(struct lbuf * bp)
1936{
1937 unsigned long flags;
1938
1939 LCACHE_LOCK(flags);
1940
1941 lbmfree(bp);
1942
1943 LCACHE_UNLOCK(flags);
1944}
1945
1946static void lbmfree(struct lbuf * bp)
1947{
1948 struct jfs_log *log = bp->l_log;
1949
1950 assert(bp->l_wqnext == NULL);
1951
1952 /*
1953 * return the buffer to head of freelist
1954 */
1955 bp->l_freelist = log->lbuf_free;
1956 log->lbuf_free = bp;
1957
1958 wake_up(&log->free_wait);
1959 return;
1960}
1961
1962
1963/*
1964 * NAME: lbmRedrive
1965 *
1966 * FUNCTION: add a log buffer to the the log redrive list
1967 *
1968 * PARAMETER:
1969 * bp - log buffer
1970 *
1971 * NOTES:
1972 * Takes log_redrive_lock.
1973 */
1974static inline void lbmRedrive(struct lbuf *bp)
1975{
1976 unsigned long flags;
1977
1978 spin_lock_irqsave(&log_redrive_lock, flags);
1979 bp->l_redrive_next = log_redrive_list;
1980 log_redrive_list = bp;
1981 spin_unlock_irqrestore(&log_redrive_lock, flags);
1982
1983 wake_up(&jfs_IO_thread_wait);
1984}
1985
1986
1987/*
1988 * lbmRead()
1989 */
1990static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1991{
1992 struct bio *bio;
1993 struct lbuf *bp;
1994
1995 /*
1996 * allocate a log buffer
1997 */
1998 *bpp = bp = lbmAllocate(log, pn);
1999 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
2000
2001 bp->l_flag |= lbmREAD;
2002
2003 bio = bio_alloc(GFP_NOFS, 1);
2004
2005 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2006 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002007 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002009 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010
2011 bio->bi_vcnt = 1;
2012 bio->bi_idx = 0;
2013 bio->bi_size = LOGPSIZE;
2014
2015 bio->bi_end_io = lbmIODone;
2016 bio->bi_private = bp;
2017 submit_bio(READ_SYNC, bio);
2018
2019 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2020
2021 return 0;
2022}
2023
2024
2025/*
2026 * lbmWrite()
2027 *
2028 * buffer at head of pageout queue stays after completion of
2029 * partial-page pageout and redriven by explicit initiation of
2030 * pageout by caller until full-page pageout is completed and
2031 * released.
2032 *
2033 * device driver i/o done redrives pageout of new buffer at
2034 * head of pageout queue when current buffer at head of pageout
2035 * queue is released at the completion of its full-page pageout.
2036 *
2037 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2038 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2039 */
2040static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2041 int cant_block)
2042{
2043 struct lbuf *tail;
2044 unsigned long flags;
2045
2046 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2047
2048 /* map the logical block address to physical block address */
2049 bp->l_blkno =
2050 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2051
2052 LCACHE_LOCK(flags); /* disable+lock */
2053
2054 /*
2055 * initialize buffer for device driver
2056 */
2057 bp->l_flag = flag;
2058
2059 /*
2060 * insert bp at tail of write queue associated with log
2061 *
2062 * (request is either for bp already/currently at head of queue
2063 * or new bp to be inserted at tail)
2064 */
2065 tail = log->wqueue;
2066
2067 /* is buffer not already on write queue ? */
2068 if (bp->l_wqnext == NULL) {
2069 /* insert at tail of wqueue */
2070 if (tail == NULL) {
2071 log->wqueue = bp;
2072 bp->l_wqnext = bp;
2073 } else {
2074 log->wqueue = bp;
2075 bp->l_wqnext = tail->l_wqnext;
2076 tail->l_wqnext = bp;
2077 }
2078
2079 tail = bp;
2080 }
2081
2082 /* is buffer at head of wqueue and for write ? */
2083 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) {
2084 LCACHE_UNLOCK(flags); /* unlock+enable */
2085 return;
2086 }
2087
2088 LCACHE_UNLOCK(flags); /* unlock+enable */
2089
2090 if (cant_block)
2091 lbmRedrive(bp);
2092 else if (flag & lbmSYNC)
2093 lbmStartIO(bp);
2094 else {
2095 LOGGC_UNLOCK(log);
2096 lbmStartIO(bp);
2097 LOGGC_LOCK(log);
2098 }
2099}
2100
2101
2102/*
2103 * lbmDirectWrite()
2104 *
2105 * initiate pageout bypassing write queue for sidestream
2106 * (e.g., log superblock) write;
2107 */
2108static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2109{
2110 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2111 bp, flag, bp->l_pn);
2112
2113 /*
2114 * initialize buffer for device driver
2115 */
2116 bp->l_flag = flag | lbmDIRECT;
2117
2118 /* map the logical block address to physical block address */
2119 bp->l_blkno =
2120 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2121
2122 /*
2123 * initiate pageout of the page
2124 */
2125 lbmStartIO(bp);
2126}
2127
2128
2129/*
2130 * NAME: lbmStartIO()
2131 *
2132 * FUNCTION: Interface to DD strategy routine
2133 *
2134 * RETURN: none
2135 *
2136 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2137 */
2138static void lbmStartIO(struct lbuf * bp)
2139{
2140 struct bio *bio;
2141 struct jfs_log *log = bp->l_log;
2142
2143 jfs_info("lbmStartIO\n");
2144
2145 bio = bio_alloc(GFP_NOFS, 1);
2146 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2147 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002148 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002150 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151
2152 bio->bi_vcnt = 1;
2153 bio->bi_idx = 0;
2154 bio->bi_size = LOGPSIZE;
2155
2156 bio->bi_end_io = lbmIODone;
2157 bio->bi_private = bp;
2158
2159 /* check if journaling to disk has been disabled */
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002160 if (log->no_integrity) {
2161 bio->bi_size = 0;
2162 lbmIODone(bio, 0, 0);
2163 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 submit_bio(WRITE_SYNC, bio);
2165 INCREMENT(lmStat.submitted);
2166 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167}
2168
2169
2170/*
2171 * lbmIOWait()
2172 */
2173static int lbmIOWait(struct lbuf * bp, int flag)
2174{
2175 unsigned long flags;
2176 int rc = 0;
2177
2178 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2179
2180 LCACHE_LOCK(flags); /* disable+lock */
2181
2182 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2183
2184 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2185
2186 if (flag & lbmFREE)
2187 lbmfree(bp);
2188
2189 LCACHE_UNLOCK(flags); /* unlock+enable */
2190
2191 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2192 return rc;
2193}
2194
2195/*
2196 * lbmIODone()
2197 *
2198 * executed at INTIODONE level
2199 */
2200static int lbmIODone(struct bio *bio, unsigned int bytes_done, int error)
2201{
2202 struct lbuf *bp = bio->bi_private;
2203 struct lbuf *nextbp, *tail;
2204 struct jfs_log *log;
2205 unsigned long flags;
2206
2207 if (bio->bi_size)
2208 return 1;
2209
2210 /*
2211 * get back jfs buffer bound to the i/o buffer
2212 */
2213 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2214
2215 LCACHE_LOCK(flags); /* disable+lock */
2216
2217 bp->l_flag |= lbmDONE;
2218
2219 if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
2220 bp->l_flag |= lbmERROR;
2221
2222 jfs_err("lbmIODone: I/O error in JFS log");
2223 }
2224
2225 bio_put(bio);
2226
2227 /*
2228 * pagein completion
2229 */
2230 if (bp->l_flag & lbmREAD) {
2231 bp->l_flag &= ~lbmREAD;
2232
2233 LCACHE_UNLOCK(flags); /* unlock+enable */
2234
2235 /* wakeup I/O initiator */
2236 LCACHE_WAKEUP(&bp->l_ioevent);
2237
2238 return 0;
2239 }
2240
2241 /*
2242 * pageout completion
2243 *
2244 * the bp at the head of write queue has completed pageout.
2245 *
2246 * if single-commit/full-page pageout, remove the current buffer
2247 * from head of pageout queue, and redrive pageout with
2248 * the new buffer at head of pageout queue;
2249 * otherwise, the partial-page pageout buffer stays at
2250 * the head of pageout queue to be redriven for pageout
2251 * by lmGroupCommit() until full-page pageout is completed.
2252 */
2253 bp->l_flag &= ~lbmWRITE;
2254 INCREMENT(lmStat.pagedone);
2255
2256 /* update committed lsn */
2257 log = bp->l_log;
2258 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2259
2260 if (bp->l_flag & lbmDIRECT) {
2261 LCACHE_WAKEUP(&bp->l_ioevent);
2262 LCACHE_UNLOCK(flags);
2263 return 0;
2264 }
2265
2266 tail = log->wqueue;
2267
2268 /* single element queue */
2269 if (bp == tail) {
2270 /* remove head buffer of full-page pageout
2271 * from log device write queue
2272 */
2273 if (bp->l_flag & lbmRELEASE) {
2274 log->wqueue = NULL;
2275 bp->l_wqnext = NULL;
2276 }
2277 }
2278 /* multi element queue */
2279 else {
2280 /* remove head buffer of full-page pageout
2281 * from log device write queue
2282 */
2283 if (bp->l_flag & lbmRELEASE) {
2284 nextbp = tail->l_wqnext = bp->l_wqnext;
2285 bp->l_wqnext = NULL;
2286
2287 /*
2288 * redrive pageout of next page at head of write queue:
2289 * redrive next page without any bound tblk
2290 * (i.e., page w/o any COMMIT records), or
2291 * first page of new group commit which has been
2292 * queued after current page (subsequent pageout
2293 * is performed synchronously, except page without
2294 * any COMMITs) by lmGroupCommit() as indicated
2295 * by lbmWRITE flag;
2296 */
2297 if (nextbp->l_flag & lbmWRITE) {
2298 /*
2299 * We can't do the I/O at interrupt time.
2300 * The jfsIO thread can do it
2301 */
2302 lbmRedrive(nextbp);
2303 }
2304 }
2305 }
2306
2307 /*
2308 * synchronous pageout:
2309 *
2310 * buffer has not necessarily been removed from write queue
2311 * (e.g., synchronous write of partial-page with COMMIT):
2312 * leave buffer for i/o initiator to dispose
2313 */
2314 if (bp->l_flag & lbmSYNC) {
2315 LCACHE_UNLOCK(flags); /* unlock+enable */
2316
2317 /* wakeup I/O initiator */
2318 LCACHE_WAKEUP(&bp->l_ioevent);
2319 }
2320
2321 /*
2322 * Group Commit pageout:
2323 */
2324 else if (bp->l_flag & lbmGC) {
2325 LCACHE_UNLOCK(flags);
2326 lmPostGC(bp);
2327 }
2328
2329 /*
2330 * asynchronous pageout:
2331 *
2332 * buffer must have been removed from write queue:
2333 * insert buffer at head of freelist where it can be recycled
2334 */
2335 else {
2336 assert(bp->l_flag & lbmRELEASE);
2337 assert(bp->l_flag & lbmFREE);
2338 lbmfree(bp);
2339
2340 LCACHE_UNLOCK(flags); /* unlock+enable */
2341 }
2342
2343 return 0;
2344}
2345
2346int jfsIOWait(void *arg)
2347{
2348 struct lbuf *bp;
2349
2350 daemonize("jfsIO");
2351
2352 complete(&jfsIOwait);
2353
2354 do {
2355 DECLARE_WAITQUEUE(wq, current);
2356
2357 spin_lock_irq(&log_redrive_lock);
2358 while ((bp = log_redrive_list) != 0) {
2359 log_redrive_list = bp->l_redrive_next;
2360 bp->l_redrive_next = NULL;
2361 spin_unlock_irq(&log_redrive_lock);
2362 lbmStartIO(bp);
2363 spin_lock_irq(&log_redrive_lock);
2364 }
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002365 if (freezing(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366 spin_unlock_irq(&log_redrive_lock);
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002367 refrigerator();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 } else {
2369 add_wait_queue(&jfs_IO_thread_wait, &wq);
2370 set_current_state(TASK_INTERRUPTIBLE);
2371 spin_unlock_irq(&log_redrive_lock);
2372 schedule();
2373 current->state = TASK_RUNNING;
2374 remove_wait_queue(&jfs_IO_thread_wait, &wq);
2375 }
2376 } while (!jfs_stop_threads);
2377
2378 jfs_info("jfsIOWait being killed!");
2379 complete_and_exit(&jfsIOwait, 0);
2380}
2381
2382/*
2383 * NAME: lmLogFormat()/jfs_logform()
2384 *
2385 * FUNCTION: format file system log
2386 *
2387 * PARAMETERS:
2388 * log - volume log
2389 * logAddress - start address of log space in FS block
2390 * logSize - length of log space in FS block;
2391 *
2392 * RETURN: 0 - success
2393 * -EIO - i/o error
2394 *
2395 * XXX: We're synchronously writing one page at a time. This needs to
2396 * be improved by writing multiple pages at once.
2397 */
2398int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
2399{
2400 int rc = -EIO;
2401 struct jfs_sb_info *sbi;
2402 struct logsuper *logsuper;
2403 struct logpage *lp;
2404 int lspn; /* log sequence page number */
2405 struct lrd *lrd_ptr;
2406 int npages = 0;
2407 struct lbuf *bp;
2408
2409 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2410 (long long)logAddress, logSize);
2411
2412 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2413
2414 /* allocate a log buffer */
2415 bp = lbmAllocate(log, 1);
2416
2417 npages = logSize >> sbi->l2nbperpage;
2418
2419 /*
2420 * log space:
2421 *
2422 * page 0 - reserved;
2423 * page 1 - log superblock;
2424 * page 2 - log data page: A SYNC log record is written
2425 * into this page at logform time;
2426 * pages 3-N - log data page: set to empty log data pages;
2427 */
2428 /*
2429 * init log superblock: log page 1
2430 */
2431 logsuper = (struct logsuper *) bp->l_ldata;
2432
2433 logsuper->magic = cpu_to_le32(LOGMAGIC);
2434 logsuper->version = cpu_to_le32(LOGVERSION);
2435 logsuper->state = cpu_to_le32(LOGREDONE);
2436 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */
2437 logsuper->size = cpu_to_le32(npages);
2438 logsuper->bsize = cpu_to_le32(sbi->bsize);
2439 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
2440 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
2441
2442 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2443 bp->l_blkno = logAddress + sbi->nbperpage;
2444 lbmStartIO(bp);
2445 if ((rc = lbmIOWait(bp, 0)))
2446 goto exit;
2447
2448 /*
2449 * init pages 2 to npages-1 as log data pages:
2450 *
2451 * log page sequence number (lpsn) initialization:
2452 *
2453 * pn: 0 1 2 3 n-1
2454 * +-----+-----+=====+=====+===.....===+=====+
2455 * lspn: N-1 0 1 N-2
2456 * <--- N page circular file ---->
2457 *
2458 * the N (= npages-2) data pages of the log is maintained as
2459 * a circular file for the log records;
2460 * lpsn grows by 1 monotonically as each log page is written
2461 * to the circular file of the log;
2462 * and setLogpage() will not reset the page number even if
2463 * the eor is equal to LOGPHDRSIZE. In order for binary search
2464 * still work in find log end process, we have to simulate the
2465 * log wrap situation at the log format time.
2466 * The 1st log page written will have the highest lpsn. Then
2467 * the succeeding log pages will have ascending order of
2468 * the lspn starting from 0, ... (N-2)
2469 */
2470 lp = (struct logpage *) bp->l_ldata;
2471 /*
2472 * initialize 1st log page to be written: lpsn = N - 1,
2473 * write a SYNCPT log record is written to this page
2474 */
2475 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2476 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
2477
2478 lrd_ptr = (struct lrd *) &lp->data;
2479 lrd_ptr->logtid = 0;
2480 lrd_ptr->backchain = 0;
2481 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT);
2482 lrd_ptr->length = 0;
2483 lrd_ptr->log.syncpt.sync = 0;
2484
2485 bp->l_blkno += sbi->nbperpage;
2486 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2487 lbmStartIO(bp);
2488 if ((rc = lbmIOWait(bp, 0)))
2489 goto exit;
2490
2491 /*
2492 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
2493 */
2494 for (lspn = 0; lspn < npages - 3; lspn++) {
2495 lp->h.page = lp->t.page = cpu_to_le32(lspn);
2496 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
2497
2498 bp->l_blkno += sbi->nbperpage;
2499 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2500 lbmStartIO(bp);
2501 if ((rc = lbmIOWait(bp, 0)))
2502 goto exit;
2503 }
2504
2505 rc = 0;
2506exit:
2507 /*
2508 * finalize log
2509 */
2510 /* release the buffer */
2511 lbmFree(bp);
2512
2513 return rc;
2514}
2515
2516#ifdef CONFIG_JFS_STATISTICS
2517int jfs_lmstats_read(char *buffer, char **start, off_t offset, int length,
2518 int *eof, void *data)
2519{
2520 int len = 0;
2521 off_t begin;
2522
2523 len += sprintf(buffer,
2524 "JFS Logmgr stats\n"
2525 "================\n"
2526 "commits = %d\n"
2527 "writes submitted = %d\n"
2528 "writes completed = %d\n"
2529 "full pages submitted = %d\n"
2530 "partial pages submitted = %d\n",
2531 lmStat.commit,
2532 lmStat.submitted,
2533 lmStat.pagedone,
2534 lmStat.full_page,
2535 lmStat.partial_page);
2536
2537 begin = offset;
2538 *start = buffer + begin;
2539 len -= begin;
2540
2541 if (len > length)
2542 len = length;
2543 else
2544 *eof = 1;
2545
2546 if (len < 0)
2547 len = 0;
2548
2549 return len;
2550}
2551#endif /* CONFIG_JFS_STATISTICS */