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1da177e4
LT
1/*
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
63f83c9f 7 * the Free Software Foundation; either version 2 of the License, or
1da177e4 8 * (at your option) any later version.
63f83c9f 9 *
1da177e4
LT
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
63f83c9f 16 * along with this program; if not, write to the Free Software
1da177e4
LT
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>
1da177e4 65#include <linux/completion.h>
91dbb4de 66#include <linux/kthread.h>
1da177e4
LT
67#include <linux/buffer_head.h> /* for sync_blockdev() */
68#include <linux/bio.h>
7dfb7103 69#include <linux/freezer.h>
afeacc8c 70#include <linux/export.h>
1da177e4 71#include <linux/delay.h>
353ab6e9 72#include <linux/mutex.h>
b2e03ca7 73#include <linux/seq_file.h>
5a0e3ad6 74#include <linux/slab.h>
1da177e4
LT
75#include "jfs_incore.h"
76#include "jfs_filsys.h"
77#include "jfs_metapage.h"
1868f4aa 78#include "jfs_superblock.h"
1da177e4
LT
79#include "jfs_txnmgr.h"
80#include "jfs_debug.h"
81
82
83/*
84 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread)
85 */
86static struct lbuf *log_redrive_list;
87static DEFINE_SPINLOCK(log_redrive_lock);
1da177e4
LT
88
89
90/*
91 * log read/write serialization (per log)
92 */
1de87444
IM
93#define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock)
94#define LOG_LOCK(log) mutex_lock(&((log)->loglock))
95#define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock))
1da177e4
LT
96
97
98/*
99 * log group commit serialization (per log)
100 */
101
102#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock)
103#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock)
104#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock)
105#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait)
106
107/*
108 * log sync serialization (per log)
109 */
110#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE)
111#define LOGSYNC_BARRIER(logsize) ((logsize)/4)
112/*
113#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE)
114#define LOGSYNC_BARRIER(logsize) ((logsize)/2)
115*/
116
117
118/*
119 * log buffer cache synchronization
120 */
121static DEFINE_SPINLOCK(jfsLCacheLock);
122
123#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags)
124#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags)
125
126/*
127 * See __SLEEP_COND in jfs_locks.h
128 */
129#define LCACHE_SLEEP_COND(wq, cond, flags) \
130do { \
131 if (cond) \
132 break; \
133 __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \
134} while (0)
135
136#define LCACHE_WAKEUP(event) wake_up(event)
137
138
139/*
140 * lbuf buffer cache (lCache) control
141 */
142/* log buffer manager pageout control (cumulative, inclusive) */
143#define lbmREAD 0x0001
144#define lbmWRITE 0x0002 /* enqueue at tail of write queue;
145 * init pageout if at head of queue;
146 */
147#define lbmRELEASE 0x0004 /* remove from write queue
148 * at completion of pageout;
149 * do not free/recycle it yet:
150 * caller will free it;
151 */
152#define lbmSYNC 0x0008 /* do not return to freelist
153 * when removed from write queue;
154 */
155#define lbmFREE 0x0010 /* return to freelist
156 * at completion of pageout;
157 * the buffer may be recycled;
158 */
159#define lbmDONE 0x0020
160#define lbmERROR 0x0040
161#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing
162 * of log page
163 */
164#define lbmDIRECT 0x0100
165
166/*
167 * Global list of active external journals
168 */
169static LIST_HEAD(jfs_external_logs);
bc4e6b28 170static struct jfs_log *dummy_log;
353ab6e9 171static DEFINE_MUTEX(jfs_log_mutex);
1da177e4 172
1da177e4
LT
173/*
174 * forward references
175 */
176static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
177 struct lrd * lrd, struct tlock * tlck);
178
179static int lmNextPage(struct jfs_log * log);
180static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
181 int activate);
182
183static int open_inline_log(struct super_block *sb);
184static int open_dummy_log(struct super_block *sb);
185static int lbmLogInit(struct jfs_log * log);
186static void lbmLogShutdown(struct jfs_log * log);
187static struct lbuf *lbmAllocate(struct jfs_log * log, int);
188static void lbmFree(struct lbuf * bp);
189static void lbmfree(struct lbuf * bp);
190static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);
191static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block);
192static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag);
193static int lbmIOWait(struct lbuf * bp, int flag);
194static bio_end_io_t lbmIODone;
195static void lbmStartIO(struct lbuf * bp);
196static void lmGCwrite(struct jfs_log * log, int cant_block);
cbc3d65e 197static int lmLogSync(struct jfs_log * log, int hard_sync);
1da177e4
LT
198
199
200
201/*
202 * statistics
203 */
204#ifdef CONFIG_JFS_STATISTICS
205static struct lmStat {
206 uint commit; /* # of commit */
207 uint pagedone; /* # of page written */
208 uint submitted; /* # of pages submitted */
209 uint full_page; /* # of full pages submitted */
210 uint partial_page; /* # of partial pages submitted */
211} lmStat;
212#endif
213
67e6682f
DK
214static void write_special_inodes(struct jfs_log *log,
215 int (*writer)(struct address_space *))
216{
217 struct jfs_sb_info *sbi;
218
219 list_for_each_entry(sbi, &log->sb_list, log_list) {
220 writer(sbi->ipbmap->i_mapping);
221 writer(sbi->ipimap->i_mapping);
222 writer(sbi->direct_inode->i_mapping);
223 }
224}
1da177e4
LT
225
226/*
227 * NAME: lmLog()
228 *
229 * FUNCTION: write a log record;
230 *
231 * PARAMETER:
232 *
233 * RETURN: lsn - offset to the next log record to write (end-of-log);
234 * -1 - error;
235 *
236 * note: todo: log error handler
237 */
238int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
239 struct tlock * tlck)
240{
241 int lsn;
242 int diffp, difft;
243 struct metapage *mp = NULL;
7fab479b 244 unsigned long flags;
1da177e4
LT
245
246 jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p",
247 log, tblk, lrd, tlck);
248
249 LOG_LOCK(log);
250
251 /* log by (out-of-transaction) JFS ? */
252 if (tblk == NULL)
253 goto writeRecord;
254
255 /* log from page ? */
256 if (tlck == NULL ||
257 tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL)
258 goto writeRecord;
259
260 /*
f720e3ba 261 * initialize/update page/transaction recovery lsn
1da177e4
LT
262 */
263 lsn = log->lsn;
264
7fab479b 265 LOGSYNC_LOCK(log, flags);
1da177e4
LT
266
267 /*
268 * initialize page lsn if first log write of the page
269 */
270 if (mp->lsn == 0) {
271 mp->log = log;
272 mp->lsn = lsn;
273 log->count++;
274
275 /* insert page at tail of logsynclist */
276 list_add_tail(&mp->synclist, &log->synclist);
277 }
278
279 /*
f720e3ba 280 * initialize/update lsn of tblock of the page
1da177e4
LT
281 *
282 * transaction inherits oldest lsn of pages associated
283 * with allocation/deallocation of resources (their
284 * log records are used to reconstruct allocation map
285 * at recovery time: inode for inode allocation map,
286 * B+-tree index of extent descriptors for block
287 * allocation map);
288 * allocation map pages inherit transaction lsn at
289 * commit time to allow forwarding log syncpt past log
290 * records associated with allocation/deallocation of
291 * resources only after persistent map of these map pages
292 * have been updated and propagated to home.
293 */
294 /*
295 * initialize transaction lsn:
296 */
297 if (tblk->lsn == 0) {
298 /* inherit lsn of its first page logged */
299 tblk->lsn = mp->lsn;
300 log->count++;
301
302 /* insert tblock after the page on logsynclist */
303 list_add(&tblk->synclist, &mp->synclist);
304 }
305 /*
306 * update transaction lsn:
307 */
308 else {
309 /* inherit oldest/smallest lsn of page */
310 logdiff(diffp, mp->lsn, log);
311 logdiff(difft, tblk->lsn, log);
312 if (diffp < difft) {
313 /* update tblock lsn with page lsn */
314 tblk->lsn = mp->lsn;
315
316 /* move tblock after page on logsynclist */
317 list_move(&tblk->synclist, &mp->synclist);
318 }
319 }
320
7fab479b 321 LOGSYNC_UNLOCK(log, flags);
1da177e4
LT
322
323 /*
f720e3ba 324 * write the log record
1da177e4
LT
325 */
326 writeRecord:
327 lsn = lmWriteRecord(log, tblk, lrd, tlck);
328
329 /*
330 * forward log syncpt if log reached next syncpt trigger
331 */
332 logdiff(diffp, lsn, log);
333 if (diffp >= log->nextsync)
334 lsn = lmLogSync(log, 0);
335
336 /* update end-of-log lsn */
337 log->lsn = lsn;
338
339 LOG_UNLOCK(log);
340
341 /* return end-of-log address */
342 return lsn;
343}
344
1da177e4
LT
345/*
346 * NAME: lmWriteRecord()
347 *
348 * FUNCTION: move the log record to current log page
349 *
350 * PARAMETER: cd - commit descriptor
351 *
352 * RETURN: end-of-log address
63f83c9f 353 *
1da177e4
LT
354 * serialization: LOG_LOCK() held on entry/exit
355 */
356static int
357lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
358 struct tlock * tlck)
359{
360 int lsn = 0; /* end-of-log address */
361 struct lbuf *bp; /* dst log page buffer */
362 struct logpage *lp; /* dst log page */
363 caddr_t dst; /* destination address in log page */
364 int dstoffset; /* end-of-log offset in log page */
365 int freespace; /* free space in log page */
366 caddr_t p; /* src meta-data page */
367 caddr_t src;
368 int srclen;
369 int nbytes; /* number of bytes to move */
370 int i;
371 int len;
372 struct linelock *linelock;
373 struct lv *lv;
374 struct lvd *lvd;
375 int l2linesize;
376
377 len = 0;
378
379 /* retrieve destination log page to write */
380 bp = (struct lbuf *) log->bp;
381 lp = (struct logpage *) bp->l_ldata;
382 dstoffset = log->eor;
383
384 /* any log data to write ? */
385 if (tlck == NULL)
386 goto moveLrd;
387
388 /*
f720e3ba 389 * move log record data
1da177e4
LT
390 */
391 /* retrieve source meta-data page to log */
392 if (tlck->flag & tlckPAGELOCK) {
393 p = (caddr_t) (tlck->mp->data);
394 linelock = (struct linelock *) & tlck->lock;
395 }
396 /* retrieve source in-memory inode to log */
397 else if (tlck->flag & tlckINODELOCK) {
398 if (tlck->type & tlckDTREE)
399 p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot;
400 else
401 p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot;
402 linelock = (struct linelock *) & tlck->lock;
403 }
404#ifdef _JFS_WIP
405 else if (tlck->flag & tlckINLINELOCK) {
406
407 inlinelock = (struct inlinelock *) & tlck;
408 p = (caddr_t) & inlinelock->pxd;
409 linelock = (struct linelock *) & tlck;
410 }
411#endif /* _JFS_WIP */
412 else {
413 jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck);
414 return 0; /* Probably should trap */
415 }
416 l2linesize = linelock->l2linesize;
417
418 moveData:
419 ASSERT(linelock->index <= linelock->maxcnt);
420
421 lv = linelock->lv;
422 for (i = 0; i < linelock->index; i++, lv++) {
423 if (lv->length == 0)
424 continue;
425
426 /* is page full ? */
427 if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) {
428 /* page become full: move on to next page */
429 lmNextPage(log);
430
431 bp = log->bp;
432 lp = (struct logpage *) bp->l_ldata;
433 dstoffset = LOGPHDRSIZE;
434 }
435
436 /*
437 * move log vector data
438 */
439 src = (u8 *) p + (lv->offset << l2linesize);
440 srclen = lv->length << l2linesize;
441 len += srclen;
442 while (srclen > 0) {
443 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
444 nbytes = min(freespace, srclen);
445 dst = (caddr_t) lp + dstoffset;
446 memcpy(dst, src, nbytes);
447 dstoffset += nbytes;
448
449 /* is page not full ? */
450 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
451 break;
452
453 /* page become full: move on to next page */
454 lmNextPage(log);
455
456 bp = (struct lbuf *) log->bp;
457 lp = (struct logpage *) bp->l_ldata;
458 dstoffset = LOGPHDRSIZE;
459
460 srclen -= nbytes;
461 src += nbytes;
462 }
463
464 /*
465 * move log vector descriptor
466 */
467 len += 4;
468 lvd = (struct lvd *) ((caddr_t) lp + dstoffset);
469 lvd->offset = cpu_to_le16(lv->offset);
470 lvd->length = cpu_to_le16(lv->length);
471 dstoffset += 4;
472 jfs_info("lmWriteRecord: lv offset:%d length:%d",
473 lv->offset, lv->length);
474 }
475
476 if ((i = linelock->next)) {
477 linelock = (struct linelock *) lid_to_tlock(i);
478 goto moveData;
479 }
480
481 /*
f720e3ba 482 * move log record descriptor
1da177e4
LT
483 */
484 moveLrd:
485 lrd->length = cpu_to_le16(len);
486
487 src = (caddr_t) lrd;
488 srclen = LOGRDSIZE;
489
490 while (srclen > 0) {
491 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
492 nbytes = min(freespace, srclen);
493 dst = (caddr_t) lp + dstoffset;
494 memcpy(dst, src, nbytes);
495
496 dstoffset += nbytes;
497 srclen -= nbytes;
498
499 /* are there more to move than freespace of page ? */
500 if (srclen)
501 goto pageFull;
502
503 /*
504 * end of log record descriptor
505 */
506
507 /* update last log record eor */
508 log->eor = dstoffset;
509 bp->l_eor = dstoffset;
510 lsn = (log->page << L2LOGPSIZE) + dstoffset;
511
512 if (lrd->type & cpu_to_le16(LOG_COMMIT)) {
513 tblk->clsn = lsn;
514 jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn,
515 bp->l_eor);
516
517 INCREMENT(lmStat.commit); /* # of commit */
518
519 /*
520 * enqueue tblock for group commit:
521 *
522 * enqueue tblock of non-trivial/synchronous COMMIT
523 * at tail of group commit queue
524 * (trivial/asynchronous COMMITs are ignored by
525 * group commit.)
526 */
527 LOGGC_LOCK(log);
528
529 /* init tblock gc state */
530 tblk->flag = tblkGC_QUEUE;
531 tblk->bp = log->bp;
532 tblk->pn = log->page;
533 tblk->eor = log->eor;
534
535 /* enqueue transaction to commit queue */
536 list_add_tail(&tblk->cqueue, &log->cqueue);
537
538 LOGGC_UNLOCK(log);
539 }
540
541 jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x",
542 le16_to_cpu(lrd->type), log->bp, log->page, dstoffset);
543
544 /* page not full ? */
545 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
546 return lsn;
547
548 pageFull:
549 /* page become full: move on to next page */
550 lmNextPage(log);
551
552 bp = (struct lbuf *) log->bp;
553 lp = (struct logpage *) bp->l_ldata;
554 dstoffset = LOGPHDRSIZE;
555 src += nbytes;
556 }
557
558 return lsn;
559}
560
561
562/*
563 * NAME: lmNextPage()
564 *
565 * FUNCTION: write current page and allocate next page.
566 *
567 * PARAMETER: log
568 *
569 * RETURN: 0
63f83c9f 570 *
1da177e4
LT
571 * serialization: LOG_LOCK() held on entry/exit
572 */
573static int lmNextPage(struct jfs_log * log)
574{
575 struct logpage *lp;
576 int lspn; /* log sequence page number */
577 int pn; /* current page number */
578 struct lbuf *bp;
579 struct lbuf *nextbp;
580 struct tblock *tblk;
581
582 /* get current log page number and log sequence page number */
583 pn = log->page;
584 bp = log->bp;
585 lp = (struct logpage *) bp->l_ldata;
586 lspn = le32_to_cpu(lp->h.page);
587
588 LOGGC_LOCK(log);
589
590 /*
f720e3ba 591 * write or queue the full page at the tail of write queue
1da177e4
LT
592 */
593 /* get the tail tblk on commit queue */
594 if (list_empty(&log->cqueue))
595 tblk = NULL;
596 else
597 tblk = list_entry(log->cqueue.prev, struct tblock, cqueue);
598
599 /* every tblk who has COMMIT record on the current page,
600 * and has not been committed, must be on commit queue
601 * since tblk is queued at commit queueu at the time
602 * of writing its COMMIT record on the page before
603 * page becomes full (even though the tblk thread
604 * who wrote COMMIT record may have been suspended
605 * currently);
606 */
607
608 /* is page bound with outstanding tail tblk ? */
609 if (tblk && tblk->pn == pn) {
610 /* mark tblk for end-of-page */
611 tblk->flag |= tblkGC_EOP;
612
613 if (log->cflag & logGC_PAGEOUT) {
614 /* if page is not already on write queue,
615 * just enqueue (no lbmWRITE to prevent redrive)
616 * buffer to wqueue to ensure correct serial order
617 * of the pages since log pages will be added
618 * continuously
619 */
620 if (bp->l_wqnext == NULL)
621 lbmWrite(log, bp, 0, 0);
622 } else {
623 /*
624 * No current GC leader, initiate group commit
625 */
626 log->cflag |= logGC_PAGEOUT;
627 lmGCwrite(log, 0);
628 }
629 }
630 /* page is not bound with outstanding tblk:
631 * init write or mark it to be redriven (lbmWRITE)
632 */
633 else {
634 /* finalize the page */
635 bp->l_ceor = bp->l_eor;
636 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
637 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0);
638 }
639 LOGGC_UNLOCK(log);
640
641 /*
f720e3ba 642 * allocate/initialize next page
1da177e4
LT
643 */
644 /* if log wraps, the first data page of log is 2
645 * (0 never used, 1 is superblock).
646 */
647 log->page = (pn == log->size - 1) ? 2 : pn + 1;
648 log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */
649
650 /* allocate/initialize next log page buffer */
651 nextbp = lbmAllocate(log, log->page);
652 nextbp->l_eor = log->eor;
653 log->bp = nextbp;
654
655 /* initialize next log page */
656 lp = (struct logpage *) nextbp->l_ldata;
657 lp->h.page = lp->t.page = cpu_to_le32(lspn + 1);
658 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
659
660 return 0;
661}
662
663
664/*
665 * NAME: lmGroupCommit()
666 *
667 * FUNCTION: group commit
668 * initiate pageout of the pages with COMMIT in the order of
669 * page number - redrive pageout of the page at the head of
670 * pageout queue until full page has been written.
671 *
63f83c9f 672 * RETURN:
1da177e4
LT
673 *
674 * NOTE:
675 * LOGGC_LOCK serializes log group commit queue, and
676 * transaction blocks on the commit queue.
677 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
678 */
679int lmGroupCommit(struct jfs_log * log, struct tblock * tblk)
680{
681 int rc = 0;
682
683 LOGGC_LOCK(log);
684
685 /* group committed already ? */
686 if (tblk->flag & tblkGC_COMMITTED) {
687 if (tblk->flag & tblkGC_ERROR)
688 rc = -EIO;
689
690 LOGGC_UNLOCK(log);
691 return rc;
692 }
693 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc);
694
695 if (tblk->xflag & COMMIT_LAZY)
696 tblk->flag |= tblkGC_LAZY;
697
698 if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) &&
699 (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag)
700 || jfs_tlocks_low)) {
701 /*
702 * No pageout in progress
703 *
704 * start group commit as its group leader.
705 */
706 log->cflag |= logGC_PAGEOUT;
707
708 lmGCwrite(log, 0);
709 }
710
711 if (tblk->xflag & COMMIT_LAZY) {
712 /*
713 * Lazy transactions can leave now
714 */
715 LOGGC_UNLOCK(log);
716 return 0;
717 }
718
719 /* lmGCwrite gives up LOGGC_LOCK, check again */
720
721 if (tblk->flag & tblkGC_COMMITTED) {
722 if (tblk->flag & tblkGC_ERROR)
723 rc = -EIO;
724
725 LOGGC_UNLOCK(log);
726 return rc;
727 }
728
729 /* upcount transaction waiting for completion
730 */
731 log->gcrtc++;
732 tblk->flag |= tblkGC_READY;
733
734 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED),
735 LOGGC_LOCK(log), LOGGC_UNLOCK(log));
736
737 /* removed from commit queue */
738 if (tblk->flag & tblkGC_ERROR)
739 rc = -EIO;
740
741 LOGGC_UNLOCK(log);
742 return rc;
743}
744
745/*
746 * NAME: lmGCwrite()
747 *
748 * FUNCTION: group commit write
749 * initiate write of log page, building a group of all transactions
750 * with commit records on that page.
751 *
752 * RETURN: None
753 *
754 * NOTE:
755 * LOGGC_LOCK must be held by caller.
756 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
757 */
758static void lmGCwrite(struct jfs_log * log, int cant_write)
759{
760 struct lbuf *bp;
761 struct logpage *lp;
762 int gcpn; /* group commit page number */
763 struct tblock *tblk;
764 struct tblock *xtblk = NULL;
765
766 /*
767 * build the commit group of a log page
768 *
769 * scan commit queue and make a commit group of all
770 * transactions with COMMIT records on the same log page.
771 */
772 /* get the head tblk on the commit queue */
773 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn;
774
775 list_for_each_entry(tblk, &log->cqueue, cqueue) {
776 if (tblk->pn != gcpn)
777 break;
778
779 xtblk = tblk;
780
781 /* state transition: (QUEUE, READY) -> COMMIT */
782 tblk->flag |= tblkGC_COMMIT;
783 }
784 tblk = xtblk; /* last tblk of the page */
785
786 /*
787 * pageout to commit transactions on the log page.
788 */
789 bp = (struct lbuf *) tblk->bp;
790 lp = (struct logpage *) bp->l_ldata;
791 /* is page already full ? */
792 if (tblk->flag & tblkGC_EOP) {
793 /* mark page to free at end of group commit of the page */
794 tblk->flag &= ~tblkGC_EOP;
795 tblk->flag |= tblkGC_FREE;
796 bp->l_ceor = bp->l_eor;
797 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
798 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC,
799 cant_write);
800 INCREMENT(lmStat.full_page);
801 }
802 /* page is not yet full */
803 else {
804 bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */
805 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
806 lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write);
807 INCREMENT(lmStat.partial_page);
808 }
809}
810
811/*
812 * NAME: lmPostGC()
813 *
814 * FUNCTION: group commit post-processing
815 * Processes transactions after their commit records have been written
816 * to disk, redriving log I/O if necessary.
817 *
818 * RETURN: None
819 *
820 * NOTE:
821 * This routine is called a interrupt time by lbmIODone
822 */
823static void lmPostGC(struct lbuf * bp)
824{
825 unsigned long flags;
826 struct jfs_log *log = bp->l_log;
827 struct logpage *lp;
828 struct tblock *tblk, *temp;
829
830 //LOGGC_LOCK(log);
831 spin_lock_irqsave(&log->gclock, flags);
832 /*
833 * current pageout of group commit completed.
834 *
835 * remove/wakeup transactions from commit queue who were
836 * group committed with the current log page
837 */
838 list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) {
839 if (!(tblk->flag & tblkGC_COMMIT))
840 break;
841 /* if transaction was marked GC_COMMIT then
842 * it has been shipped in the current pageout
843 * and made it to disk - it is committed.
844 */
845
846 if (bp->l_flag & lbmERROR)
847 tblk->flag |= tblkGC_ERROR;
848
849 /* remove it from the commit queue */
850 list_del(&tblk->cqueue);
851 tblk->flag &= ~tblkGC_QUEUE;
852
853 if (tblk == log->flush_tblk) {
854 /* we can stop flushing the log now */
855 clear_bit(log_FLUSH, &log->flag);
856 log->flush_tblk = NULL;
857 }
858
859 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk,
860 tblk->flag);
861
862 if (!(tblk->xflag & COMMIT_FORCE))
863 /*
864 * Hand tblk over to lazy commit thread
865 */
866 txLazyUnlock(tblk);
867 else {
868 /* state transition: COMMIT -> COMMITTED */
869 tblk->flag |= tblkGC_COMMITTED;
870
871 if (tblk->flag & tblkGC_READY)
872 log->gcrtc--;
873
874 LOGGC_WAKEUP(tblk);
875 }
876
877 /* was page full before pageout ?
878 * (and this is the last tblk bound with the page)
879 */
880 if (tblk->flag & tblkGC_FREE)
881 lbmFree(bp);
882 /* did page become full after pageout ?
883 * (and this is the last tblk bound with the page)
884 */
885 else if (tblk->flag & tblkGC_EOP) {
886 /* finalize the page */
887 lp = (struct logpage *) bp->l_ldata;
888 bp->l_ceor = bp->l_eor;
889 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
890 jfs_info("lmPostGC: calling lbmWrite");
891 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE,
892 1);
893 }
894
895 }
896
897 /* are there any transactions who have entered lnGroupCommit()
898 * (whose COMMITs are after that of the last log page written.
899 * They are waiting for new group commit (above at (SLEEP 1))
900 * or lazy transactions are on a full (queued) log page,
901 * select the latest ready transaction as new group leader and
902 * wake her up to lead her group.
903 */
904 if ((!list_empty(&log->cqueue)) &&
905 ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) ||
906 test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low))
907 /*
908 * Call lmGCwrite with new group leader
909 */
910 lmGCwrite(log, 1);
911
912 /* no transaction are ready yet (transactions are only just
913 * queued (GC_QUEUE) and not entered for group commit yet).
914 * the first transaction entering group commit
915 * will elect herself as new group leader.
916 */
917 else
918 log->cflag &= ~logGC_PAGEOUT;
919
920 //LOGGC_UNLOCK(log);
921 spin_unlock_irqrestore(&log->gclock, flags);
922 return;
923}
924
925/*
926 * NAME: lmLogSync()
927 *
928 * FUNCTION: write log SYNCPT record for specified log
929 * if new sync address is available
930 * (normally the case if sync() is executed by back-ground
931 * process).
1da177e4
LT
932 * calculate new value of i_nextsync which determines when
933 * this code is called again.
934 *
1c627829 935 * PARAMETERS: log - log structure
63f83c9f 936 * hard_sync - 1 to force all metadata to be written
1da177e4
LT
937 *
938 * RETURN: 0
63f83c9f 939 *
1da177e4
LT
940 * serialization: LOG_LOCK() held on entry/exit
941 */
cbc3d65e 942static int lmLogSync(struct jfs_log * log, int hard_sync)
1da177e4
LT
943{
944 int logsize;
945 int written; /* written since last syncpt */
946 int free; /* free space left available */
947 int delta; /* additional delta to write normally */
948 int more; /* additional write granted */
949 struct lrd lrd;
950 int lsn;
951 struct logsyncblk *lp;
7fab479b
DK
952 unsigned long flags;
953
954 /* push dirty metapages out to disk */
cbc3d65e 955 if (hard_sync)
67e6682f 956 write_special_inodes(log, filemap_fdatawrite);
cbc3d65e 957 else
67e6682f 958 write_special_inodes(log, filemap_flush);
1da177e4
LT
959
960 /*
f720e3ba 961 * forward syncpt
1da177e4
LT
962 */
963 /* if last sync is same as last syncpt,
964 * invoke sync point forward processing to update sync.
965 */
966
967 if (log->sync == log->syncpt) {
7fab479b 968 LOGSYNC_LOCK(log, flags);
1da177e4
LT
969 if (list_empty(&log->synclist))
970 log->sync = log->lsn;
971 else {
972 lp = list_entry(log->synclist.next,
973 struct logsyncblk, synclist);
974 log->sync = lp->lsn;
975 }
7fab479b 976 LOGSYNC_UNLOCK(log, flags);
1da177e4
LT
977
978 }
979
980 /* if sync is different from last syncpt,
981 * write a SYNCPT record with syncpt = sync.
982 * reset syncpt = sync
983 */
984 if (log->sync != log->syncpt) {
1da177e4
LT
985 lrd.logtid = 0;
986 lrd.backchain = 0;
987 lrd.type = cpu_to_le16(LOG_SYNCPT);
988 lrd.length = 0;
989 lrd.log.syncpt.sync = cpu_to_le32(log->sync);
990 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
991
992 log->syncpt = log->sync;
993 } else
994 lsn = log->lsn;
995
996 /*
f720e3ba 997 * setup next syncpt trigger (SWAG)
1da177e4
LT
998 */
999 logsize = log->logsize;
1000
1001 logdiff(written, lsn, log);
1002 free = logsize - written;
1003 delta = LOGSYNC_DELTA(logsize);
1004 more = min(free / 2, delta);
1005 if (more < 2 * LOGPSIZE) {
1006 jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n");
1007 /*
f720e3ba 1008 * log wrapping
1da177e4
LT
1009 *
1010 * option 1 - panic ? No.!
1011 * option 2 - shutdown file systems
f720e3ba 1012 * associated with log ?
1da177e4 1013 * option 3 - extend log ?
1da177e4
LT
1014 * option 4 - second chance
1015 *
1016 * mark log wrapped, and continue.
1017 * when all active transactions are completed,
817f2c84 1018 * mark log valid for recovery.
1da177e4 1019 * if crashed during invalid state, log state
817f2c84 1020 * implies invalid log, forcing fsck().
1da177e4
LT
1021 */
1022 /* mark log state log wrap in log superblock */
1023 /* log->state = LOGWRAP; */
1024
1025 /* reset sync point computation */
1026 log->syncpt = log->sync = lsn;
1027 log->nextsync = delta;
1028 } else
1029 /* next syncpt trigger = written + more */
1030 log->nextsync = written + more;
1031
1da177e4
LT
1032 /* if number of bytes written from last sync point is more
1033 * than 1/4 of the log size, stop new transactions from
1034 * starting until all current transactions are completed
1035 * by setting syncbarrier flag.
1036 */
c2783f3a
DK
1037 if (!test_bit(log_SYNCBARRIER, &log->flag) &&
1038 (written > LOGSYNC_BARRIER(logsize)) && log->active) {
1da177e4
LT
1039 set_bit(log_SYNCBARRIER, &log->flag);
1040 jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn,
1041 log->syncpt);
1042 /*
1043 * We may have to initiate group commit
1044 */
1045 jfs_flush_journal(log, 0);
1046 }
1047
1048 return lsn;
1049}
1050
1c627829
DK
1051/*
1052 * NAME: jfs_syncpt
1053 *
1054 * FUNCTION: write log SYNCPT record for specified log
1055 *
cbc3d65e 1056 * PARAMETERS: log - log structure
63f83c9f 1057 * hard_sync - set to 1 to force metadata to be written
1c627829 1058 */
cbc3d65e 1059void jfs_syncpt(struct jfs_log *log, int hard_sync)
1c627829 1060{ LOG_LOCK(log);
73aaa22d
DK
1061 if (!test_bit(log_QUIESCE, &log->flag))
1062 lmLogSync(log, hard_sync);
1c627829
DK
1063 LOG_UNLOCK(log);
1064}
1da177e4
LT
1065
1066/*
1067 * NAME: lmLogOpen()
1068 *
f720e3ba 1069 * FUNCTION: open the log on first open;
1da177e4
LT
1070 * insert filesystem in the active list of the log.
1071 *
1072 * PARAMETER: ipmnt - file system mount inode
63f83c9f 1073 * iplog - log inode (out)
1da177e4
LT
1074 *
1075 * RETURN:
1076 *
1077 * serialization:
1078 */
1079int lmLogOpen(struct super_block *sb)
1080{
1081 int rc;
1082 struct block_device *bdev;
1083 struct jfs_log *log;
1084 struct jfs_sb_info *sbi = JFS_SBI(sb);
1085
1086 if (sbi->flag & JFS_NOINTEGRITY)
1087 return open_dummy_log(sb);
63f83c9f 1088
1da177e4
LT
1089 if (sbi->mntflag & JFS_INLINELOG)
1090 return open_inline_log(sb);
1091
353ab6e9 1092 mutex_lock(&jfs_log_mutex);
1da177e4
LT
1093 list_for_each_entry(log, &jfs_external_logs, journal_list) {
1094 if (log->bdev->bd_dev == sbi->logdev) {
1095 if (memcmp(log->uuid, sbi->loguuid,
1096 sizeof(log->uuid))) {
b18db6de 1097 jfs_warn("wrong uuid on JFS journal");
353ab6e9 1098 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1099 return -EINVAL;
1100 }
1101 /*
1102 * add file system to log active file system list
1103 */
1104 if ((rc = lmLogFileSystem(log, sbi, 1))) {
353ab6e9 1105 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1106 return rc;
1107 }
1108 goto journal_found;
1109 }
1110 }
1111
5b3030e3 1112 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
353ab6e9 1113 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1114 return -ENOMEM;
1115 }
1da177e4
LT
1116 INIT_LIST_HEAD(&log->sb_list);
1117 init_waitqueue_head(&log->syncwait);
1118
1119 /*
f720e3ba 1120 * external log as separate logical volume
1da177e4
LT
1121 *
1122 * file systems to log may have n-to-1 relationship;
1123 */
1124
d4d77629
TH
1125 bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1126 log);
1da177e4 1127 if (IS_ERR(bdev)) {
9054760f 1128 rc = PTR_ERR(bdev);
1da177e4
LT
1129 goto free;
1130 }
1131
1da177e4
LT
1132 log->bdev = bdev;
1133 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
63f83c9f 1134
1da177e4
LT
1135 /*
1136 * initialize log:
1137 */
1138 if ((rc = lmLogInit(log)))
e525fd89 1139 goto close;
1da177e4
LT
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
353ab6e9 1155 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1156 return 0;
1157
1158 /*
f720e3ba 1159 * unwind on error
1da177e4
LT
1160 */
1161 shutdown: /* unwind lbmLogInit() */
1162 list_del(&log->journal_list);
1163 lbmLogShutdown(log);
1164
1da177e4 1165 close: /* close external log device */
e525fd89 1166 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT
1167
1168 free: /* free log descriptor */
353ab6e9 1169 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1170 kfree(log);
1171
1172 jfs_warn("lmLogOpen: exit(%d)", rc);
1173 return rc;
1174}
1175
1176static int open_inline_log(struct super_block *sb)
1177{
1178 struct jfs_log *log;
1179 int rc;
1180
5b3030e3 1181 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL)))
1da177e4 1182 return -ENOMEM;
1da177e4
LT
1183 INIT_LIST_HEAD(&log->sb_list);
1184 init_waitqueue_head(&log->syncwait);
1185
1186 set_bit(log_INLINELOG, &log->flag);
1187 log->bdev = sb->s_bdev;
1188 log->base = addressPXD(&JFS_SBI(sb)->logpxd);
1189 log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >>
1190 (L2LOGPSIZE - sb->s_blocksize_bits);
1191 log->l2bsize = sb->s_blocksize_bits;
1192 ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits);
1193
1194 /*
1195 * initialize log.
1196 */
1197 if ((rc = lmLogInit(log))) {
1198 kfree(log);
1199 jfs_warn("lmLogOpen: exit(%d)", rc);
1200 return rc;
1201 }
1202
1203 list_add(&JFS_SBI(sb)->log_list, &log->sb_list);
1204 JFS_SBI(sb)->log = log;
1205
1206 return rc;
1207}
1208
1209static int open_dummy_log(struct super_block *sb)
1210{
1211 int rc;
1212
353ab6e9 1213 mutex_lock(&jfs_log_mutex);
1da177e4 1214 if (!dummy_log) {
5b3030e3 1215 dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL);
1da177e4 1216 if (!dummy_log) {
353ab6e9 1217 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1218 return -ENOMEM;
1219 }
1da177e4
LT
1220 INIT_LIST_HEAD(&dummy_log->sb_list);
1221 init_waitqueue_head(&dummy_log->syncwait);
1222 dummy_log->no_integrity = 1;
1223 /* Make up some stuff */
1224 dummy_log->base = 0;
1225 dummy_log->size = 1024;
1226 rc = lmLogInit(dummy_log);
1227 if (rc) {
1228 kfree(dummy_log);
1229 dummy_log = NULL;
353ab6e9 1230 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1231 return rc;
1232 }
1233 }
1234
1235 LOG_LOCK(dummy_log);
1236 list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list);
1237 JFS_SBI(sb)->log = dummy_log;
1238 LOG_UNLOCK(dummy_log);
353ab6e9 1239 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1240
1241 return 0;
1242}
1243
1244/*
1245 * NAME: lmLogInit()
1246 *
1247 * FUNCTION: log initialization at first log open.
1248 *
1249 * logredo() (or logformat()) should have been run previously.
1250 * initialize the log from log superblock.
1251 * set the log state in the superblock to LOGMOUNT and
1252 * write SYNCPT log record.
63f83c9f 1253 *
1da177e4
LT
1254 * PARAMETER: log - log structure
1255 *
1256 * RETURN: 0 - if ok
1257 * -EINVAL - bad log magic number or superblock dirty
1258 * error returned from logwait()
63f83c9f 1259 *
1da177e4
LT
1260 * serialization: single first open thread
1261 */
1262int lmLogInit(struct jfs_log * log)
1263{
1264 int rc = 0;
1265 struct lrd lrd;
1266 struct logsuper *logsuper;
1267 struct lbuf *bpsuper;
1268 struct lbuf *bp;
1269 struct logpage *lp;
1270 int lsn = 0;
1271
1272 jfs_info("lmLogInit: log:0x%p", log);
1273
1274 /* initialize the group commit serialization lock */
1275 LOGGC_LOCK_INIT(log);
1276
1277 /* allocate/initialize the log write serialization lock */
1278 LOG_LOCK_INIT(log);
1279
1280 LOGSYNC_LOCK_INIT(log);
1281
1282 INIT_LIST_HEAD(&log->synclist);
1283
1284 INIT_LIST_HEAD(&log->cqueue);
1285 log->flush_tblk = NULL;
1286
1287 log->count = 0;
1288
1289 /*
1290 * initialize log i/o
1291 */
1292 if ((rc = lbmLogInit(log)))
1293 return rc;
1294
1295 if (!test_bit(log_INLINELOG, &log->flag))
1296 log->l2bsize = L2LOGPSIZE;
63f83c9f 1297
1da177e4
LT
1298 /* check for disabled journaling to disk */
1299 if (log->no_integrity) {
1300 /*
1301 * Journal pages will still be filled. When the time comes
1302 * to actually do the I/O, the write is not done, and the
1303 * endio routine is called directly.
1304 */
1305 bp = lbmAllocate(log , 0);
1306 log->bp = bp;
1307 bp->l_pn = bp->l_eor = 0;
1308 } else {
1309 /*
1310 * validate log superblock
1311 */
1312 if ((rc = lbmRead(log, 1, &bpsuper)))
1313 goto errout10;
1314
1315 logsuper = (struct logsuper *) bpsuper->l_ldata;
1316
1317 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) {
1318 jfs_warn("*** Log Format Error ! ***");
1319 rc = -EINVAL;
1320 goto errout20;
1321 }
1322
1323 /* logredo() should have been run successfully. */
1324 if (logsuper->state != cpu_to_le32(LOGREDONE)) {
1325 jfs_warn("*** Log Is Dirty ! ***");
1326 rc = -EINVAL;
1327 goto errout20;
1328 }
1329
1330 /* initialize log from log superblock */
1331 if (test_bit(log_INLINELOG,&log->flag)) {
1332 if (log->size != le32_to_cpu(logsuper->size)) {
1333 rc = -EINVAL;
1334 goto errout20;
1335 }
6ed71e98
JP
1336 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx size:0x%x",
1337 log, (unsigned long long)log->base, log->size);
1da177e4
LT
1338 } else {
1339 if (memcmp(logsuper->uuid, log->uuid, 16)) {
1340 jfs_warn("wrong uuid on JFS log device");
1341 goto errout20;
1342 }
1343 log->size = le32_to_cpu(logsuper->size);
1344 log->l2bsize = le32_to_cpu(logsuper->l2bsize);
6ed71e98
JP
1345 jfs_info("lmLogInit: external log:0x%p base:0x%Lx size:0x%x",
1346 log, (unsigned long long)log->base, log->size);
1da177e4
LT
1347 }
1348
1349 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
1350 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
1351
1352 /*
1353 * initialize for log append write mode
1354 */
1355 /* establish current/end-of-log page/buffer */
1356 if ((rc = lbmRead(log, log->page, &bp)))
1357 goto errout20;
1358
1359 lp = (struct logpage *) bp->l_ldata;
1360
1361 jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d",
1362 le32_to_cpu(logsuper->end), log->page, log->eor,
1363 le16_to_cpu(lp->h.eor));
1364
1365 log->bp = bp;
1366 bp->l_pn = log->page;
1367 bp->l_eor = log->eor;
1368
1369 /* if current page is full, move on to next page */
1370 if (log->eor >= LOGPSIZE - LOGPTLRSIZE)
1371 lmNextPage(log);
1372
1373 /*
1374 * initialize log syncpoint
1375 */
1376 /*
1377 * write the first SYNCPT record with syncpoint = 0
1378 * (i.e., log redo up to HERE !);
1379 * remove current page from lbm write queue at end of pageout
1380 * (to write log superblock update), but do not release to
1381 * freelist;
1382 */
1383 lrd.logtid = 0;
1384 lrd.backchain = 0;
1385 lrd.type = cpu_to_le16(LOG_SYNCPT);
1386 lrd.length = 0;
1387 lrd.log.syncpt.sync = 0;
1388 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1389 bp = log->bp;
1390 bp->l_ceor = bp->l_eor;
1391 lp = (struct logpage *) bp->l_ldata;
1392 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1393 lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0);
1394 if ((rc = lbmIOWait(bp, 0)))
1395 goto errout30;
1396
1397 /*
1398 * update/write superblock
1399 */
1400 logsuper->state = cpu_to_le32(LOGMOUNT);
1401 log->serial = le32_to_cpu(logsuper->serial) + 1;
1402 logsuper->serial = cpu_to_le32(log->serial);
1403 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1404 if ((rc = lbmIOWait(bpsuper, lbmFREE)))
1405 goto errout30;
1406 }
1407
1408 /* initialize logsync parameters */
1409 log->logsize = (log->size - 2) << L2LOGPSIZE;
1410 log->lsn = lsn;
1411 log->syncpt = lsn;
1412 log->sync = log->syncpt;
1413 log->nextsync = LOGSYNC_DELTA(log->logsize);
1414
1415 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x",
1416 log->lsn, log->syncpt, log->sync);
1417
1418 /*
1419 * initialize for lazy/group commit
1420 */
1421 log->clsn = lsn;
1422
1423 return 0;
1424
1425 /*
f720e3ba 1426 * unwind on error
1da177e4
LT
1427 */
1428 errout30: /* release log page */
1429 log->wqueue = NULL;
1430 bp->l_wqnext = NULL;
1431 lbmFree(bp);
1432
1433 errout20: /* release log superblock */
1434 lbmFree(bpsuper);
1435
1436 errout10: /* unwind lbmLogInit() */
1437 lbmLogShutdown(log);
1438
1439 jfs_warn("lmLogInit: exit(%d)", rc);
1440 return rc;
1441}
1442
1443
1444/*
1445 * NAME: lmLogClose()
1446 *
1447 * FUNCTION: remove file system <ipmnt> from active list of log <iplog>
1448 * and close it on last close.
1449 *
1450 * PARAMETER: sb - superblock
1451 *
1452 * RETURN: errors from subroutines
1453 *
1454 * serialization:
1455 */
1456int lmLogClose(struct super_block *sb)
1457{
1458 struct jfs_sb_info *sbi = JFS_SBI(sb);
1459 struct jfs_log *log = sbi->log;
1460 struct block_device *bdev;
1461 int rc = 0;
1462
1463 jfs_info("lmLogClose: log:0x%p", log);
1464
353ab6e9 1465 mutex_lock(&jfs_log_mutex);
1da177e4
LT
1466 LOG_LOCK(log);
1467 list_del(&sbi->log_list);
1468 LOG_UNLOCK(log);
1469 sbi->log = NULL;
1470
1471 /*
1472 * We need to make sure all of the "written" metapages
1473 * actually make it to disk
1474 */
1475 sync_blockdev(sb->s_bdev);
1476
1477 if (test_bit(log_INLINELOG, &log->flag)) {
1478 /*
f720e3ba 1479 * in-line log in host file system
1da177e4
LT
1480 */
1481 rc = lmLogShutdown(log);
1482 kfree(log);
1483 goto out;
1484 }
1485
1486 if (!log->no_integrity)
1487 lmLogFileSystem(log, sbi, 0);
1488
1489 if (!list_empty(&log->sb_list))
1490 goto out;
1491
1492 /*
1493 * TODO: ensure that the dummy_log is in a state to allow
1494 * lbmLogShutdown to deallocate all the buffers and call
1495 * kfree against dummy_log. For now, leave dummy_log & its
1496 * buffers in memory, and resuse if another no-integrity mount
1497 * is requested.
1498 */
1499 if (log->no_integrity)
1500 goto out;
1501
1502 /*
f720e3ba 1503 * external log as separate logical volume
1da177e4
LT
1504 */
1505 list_del(&log->journal_list);
1506 bdev = log->bdev;
1507 rc = lmLogShutdown(log);
1508
e525fd89 1509 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT
1510
1511 kfree(log);
1512
1513 out:
353ab6e9 1514 mutex_unlock(&jfs_log_mutex);
1da177e4
LT
1515 jfs_info("lmLogClose: exit(%d)", rc);
1516 return rc;
1517}
1518
1519
1520/*
1521 * NAME: jfs_flush_journal()
1522 *
1523 * FUNCTION: initiate write of any outstanding transactions to the journal
1524 * and optionally wait until they are all written to disk
1525 *
1526 * wait == 0 flush until latest txn is committed, don't wait
1527 * wait == 1 flush until latest txn is committed, wait
1528 * wait > 1 flush until all txn's are complete, wait
1529 */
1530void jfs_flush_journal(struct jfs_log *log, int wait)
1531{
1532 int i;
1533 struct tblock *target = NULL;
1534
1535 /* jfs_write_inode may call us during read-only mount */
1536 if (!log)
1537 return;
1538
1539 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait);
1540
1541 LOGGC_LOCK(log);
1542
1543 if (!list_empty(&log->cqueue)) {
1544 /*
1545 * This ensures that we will keep writing to the journal as long
1546 * as there are unwritten commit records
1547 */
1548 target = list_entry(log->cqueue.prev, struct tblock, cqueue);
1549
1550 if (test_bit(log_FLUSH, &log->flag)) {
1551 /*
1552 * We're already flushing.
1553 * if flush_tblk is NULL, we are flushing everything,
1554 * so leave it that way. Otherwise, update it to the
1555 * latest transaction
1556 */
1557 if (log->flush_tblk)
1558 log->flush_tblk = target;
1559 } else {
1560 /* Only flush until latest transaction is committed */
1561 log->flush_tblk = target;
1562 set_bit(log_FLUSH, &log->flag);
1563
1564 /*
1565 * Initiate I/O on outstanding transactions
1566 */
1567 if (!(log->cflag & logGC_PAGEOUT)) {
1568 log->cflag |= logGC_PAGEOUT;
1569 lmGCwrite(log, 0);
1570 }
1571 }
1572 }
1573 if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) {
1574 /* Flush until all activity complete */
1575 set_bit(log_FLUSH, &log->flag);
1576 log->flush_tblk = NULL;
1577 }
1578
1579 if (wait && target && !(target->flag & tblkGC_COMMITTED)) {
1580 DECLARE_WAITQUEUE(__wait, current);
1581
1582 add_wait_queue(&target->gcwait, &__wait);
1583 set_current_state(TASK_UNINTERRUPTIBLE);
1584 LOGGC_UNLOCK(log);
1585 schedule();
1da177e4
LT
1586 LOGGC_LOCK(log);
1587 remove_wait_queue(&target->gcwait, &__wait);
1588 }
1589 LOGGC_UNLOCK(log);
1590
1591 if (wait < 2)
1592 return;
1593
67e6682f 1594 write_special_inodes(log, filemap_fdatawrite);
7fab479b 1595
1da177e4
LT
1596 /*
1597 * If there was recent activity, we may need to wait
1598 * for the lazycommit thread to catch up
1599 */
1600 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
7fab479b 1601 for (i = 0; i < 200; i++) { /* Too much? */
1da177e4 1602 msleep(250);
67e6682f 1603 write_special_inodes(log, filemap_fdatawrite);
1da177e4
LT
1604 if (list_empty(&log->cqueue) &&
1605 list_empty(&log->synclist))
1606 break;
1607 }
1608 }
1609 assert(list_empty(&log->cqueue));
72e3148a
DK
1610
1611#ifdef CONFIG_JFS_DEBUG
7fab479b
DK
1612 if (!list_empty(&log->synclist)) {
1613 struct logsyncblk *lp;
1614
209e101b 1615 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n");
7fab479b
DK
1616 list_for_each_entry(lp, &log->synclist, synclist) {
1617 if (lp->xflag & COMMIT_PAGE) {
1618 struct metapage *mp = (struct metapage *)lp;
288e4d83
DK
1619 print_hex_dump(KERN_ERR, "metapage: ",
1620 DUMP_PREFIX_ADDRESS, 16, 4,
1621 mp, sizeof(struct metapage), 0);
1622 print_hex_dump(KERN_ERR, "page: ",
1623 DUMP_PREFIX_ADDRESS, 16,
1624 sizeof(long), mp->page,
1625 sizeof(struct page), 0);
1626 } else
1627 print_hex_dump(KERN_ERR, "tblock:",
1628 DUMP_PREFIX_ADDRESS, 16, 4,
1629 lp, sizeof(struct tblock), 0);
7fab479b 1630 }
7fab479b 1631 }
288e4d83
DK
1632#else
1633 WARN_ON(!list_empty(&log->synclist));
72e3148a 1634#endif
1da177e4
LT
1635 clear_bit(log_FLUSH, &log->flag);
1636}
1637
1638/*
1639 * NAME: lmLogShutdown()
1640 *
1641 * FUNCTION: log shutdown at last LogClose().
1642 *
1643 * write log syncpt record.
1644 * update super block to set redone flag to 0.
1645 *
1646 * PARAMETER: log - log inode
1647 *
1648 * RETURN: 0 - success
63f83c9f 1649 *
1da177e4
LT
1650 * serialization: single last close thread
1651 */
1652int lmLogShutdown(struct jfs_log * log)
1653{
1654 int rc;
1655 struct lrd lrd;
1656 int lsn;
1657 struct logsuper *logsuper;
1658 struct lbuf *bpsuper;
1659 struct lbuf *bp;
1660 struct logpage *lp;
1661
1662 jfs_info("lmLogShutdown: log:0x%p", log);
1663
1664 jfs_flush_journal(log, 2);
1665
1666 /*
1667 * write the last SYNCPT record with syncpoint = 0
1668 * (i.e., log redo up to HERE !)
1669 */
1670 lrd.logtid = 0;
1671 lrd.backchain = 0;
1672 lrd.type = cpu_to_le16(LOG_SYNCPT);
1673 lrd.length = 0;
1674 lrd.log.syncpt.sync = 0;
63f83c9f 1675
1da177e4
LT
1676 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1677 bp = log->bp;
1678 lp = (struct logpage *) bp->l_ldata;
1679 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1680 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
1681 lbmIOWait(log->bp, lbmFREE);
dc5798d9 1682 log->bp = NULL;
1da177e4
LT
1683
1684 /*
1685 * synchronous update log superblock
1686 * mark log state as shutdown cleanly
1687 * (i.e., Log does not need to be replayed).
1688 */
1689 if ((rc = lbmRead(log, 1, &bpsuper)))
1690 goto out;
1691
1692 logsuper = (struct logsuper *) bpsuper->l_ldata;
1693 logsuper->state = cpu_to_le32(LOGREDONE);
1694 logsuper->end = cpu_to_le32(lsn);
1695 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1696 rc = lbmIOWait(bpsuper, lbmFREE);
1697
1698 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1699 lsn, log->page, log->eor);
1700
63f83c9f 1701 out:
1da177e4
LT
1702 /*
1703 * shutdown per log i/o
1704 */
1705 lbmLogShutdown(log);
1706
1707 if (rc) {
1708 jfs_warn("lmLogShutdown: exit(%d)", rc);
1709 }
1710 return rc;
1711}
1712
1713
1714/*
1715 * NAME: lmLogFileSystem()
1716 *
1717 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1718 * file system into/from log active file system list.
1719 *
1720 * PARAMETE: log - pointer to logs inode.
1721 * fsdev - kdev_t of filesystem.
f720e3ba 1722 * serial - pointer to returned log serial number
1da177e4
LT
1723 * activate - insert/remove device from active list.
1724 *
1725 * RETURN: 0 - success
1726 * errors returned by vms_iowait().
1727 */
1728static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1729 int activate)
1730{
1731 int rc = 0;
1732 int i;
1733 struct logsuper *logsuper;
1734 struct lbuf *bpsuper;
1735 char *uuid = sbi->uuid;
1736
1737 /*
1738 * insert/remove file system device to log active file system list.
1739 */
1740 if ((rc = lbmRead(log, 1, &bpsuper)))
1741 return rc;
1742
1743 logsuper = (struct logsuper *) bpsuper->l_ldata;
1744 if (activate) {
1745 for (i = 0; i < MAX_ACTIVE; i++)
1746 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
1747 memcpy(logsuper->active[i].uuid, uuid, 16);
1748 sbi->aggregate = i;
1749 break;
1750 }
1751 if (i == MAX_ACTIVE) {
1752 jfs_warn("Too many file systems sharing journal!");
1753 lbmFree(bpsuper);
1754 return -EMFILE; /* Is there a better rc? */
1755 }
1756 } else {
1757 for (i = 0; i < MAX_ACTIVE; i++)
1758 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
1759 memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
1760 break;
1761 }
1762 if (i == MAX_ACTIVE) {
1763 jfs_warn("Somebody stomped on the journal!");
1764 lbmFree(bpsuper);
1765 return -EIO;
1766 }
63f83c9f 1767
1da177e4
LT
1768 }
1769
1770 /*
1771 * synchronous write log superblock:
1772 *
1773 * write sidestream bypassing write queue:
1774 * at file system mount, log super block is updated for
1775 * activation of the file system before any log record
1776 * (MOUNT record) of the file system, and at file system
1777 * unmount, all meta data for the file system has been
1778 * flushed before log super block is updated for deactivation
1779 * of the file system.
1780 */
1781 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1782 rc = lbmIOWait(bpsuper, lbmFREE);
1783
1784 return rc;
1785}
1786
1787/*
1788 * log buffer manager (lbm)
1789 * ------------------------
1790 *
1791 * special purpose buffer manager supporting log i/o requirements.
1792 *
1793 * per log write queue:
1794 * log pageout occurs in serial order by fifo write queue and
1795 * restricting to a single i/o in pregress at any one time.
1796 * a circular singly-linked list
1797 * (log->wrqueue points to the tail, and buffers are linked via
1798 * bp->wrqueue field), and
1799 * maintains log page in pageout ot waiting for pageout in serial pageout.
1800 */
1801
1802/*
1803 * lbmLogInit()
1804 *
1805 * initialize per log I/O setup at lmLogInit()
1806 */
1807static int lbmLogInit(struct jfs_log * log)
1808{ /* log inode */
1809 int i;
1810 struct lbuf *lbuf;
1811
1812 jfs_info("lbmLogInit: log:0x%p", log);
1813
1814 /* initialize current buffer cursor */
1815 log->bp = NULL;
1816
1817 /* initialize log device write queue */
1818 log->wqueue = NULL;
1819
1820 /*
1821 * Each log has its own buffer pages allocated to it. These are
1822 * not managed by the page cache. This ensures that a transaction
1823 * writing to the log does not block trying to allocate a page from
1824 * the page cache (for the log). This would be bad, since page
1825 * allocation waits on the kswapd thread that may be committing inodes
1826 * which would cause log activity. Was that clear? I'm trying to
1827 * avoid deadlock here.
1828 */
1829 init_waitqueue_head(&log->free_wait);
1830
1831 log->lbuf_free = NULL;
1832
dc5798d9
DK
1833 for (i = 0; i < LOGPAGES;) {
1834 char *buffer;
1835 uint offset;
76e8d7cb 1836 struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
dc5798d9 1837
76e8d7cb 1838 if (!page)
1da177e4 1839 goto error;
76e8d7cb 1840 buffer = page_address(page);
dc5798d9
DK
1841 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
1842 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
1843 if (lbuf == NULL) {
1844 if (offset == 0)
76e8d7cb 1845 __free_page(page);
dc5798d9
DK
1846 goto error;
1847 }
1848 if (offset) /* we already have one reference */
1849 get_page(page);
1850 lbuf->l_offset = offset;
1851 lbuf->l_ldata = buffer + offset;
1852 lbuf->l_page = page;
1853 lbuf->l_log = log;
1854 init_waitqueue_head(&lbuf->l_ioevent);
1855
1856 lbuf->l_freelist = log->lbuf_free;
1857 log->lbuf_free = lbuf;
1858 i++;
1da177e4 1859 }
1da177e4
LT
1860 }
1861
1862 return (0);
1863
1864 error:
1865 lbmLogShutdown(log);
1866 return -ENOMEM;
1867}
1868
1869
1870/*
1871 * lbmLogShutdown()
1872 *
1873 * finalize per log I/O setup at lmLogShutdown()
1874 */
1875static void lbmLogShutdown(struct jfs_log * log)
1876{
1877 struct lbuf *lbuf;
1878
1879 jfs_info("lbmLogShutdown: log:0x%p", log);
1880
1881 lbuf = log->lbuf_free;
1882 while (lbuf) {
1883 struct lbuf *next = lbuf->l_freelist;
dc5798d9 1884 __free_page(lbuf->l_page);
1da177e4
LT
1885 kfree(lbuf);
1886 lbuf = next;
1887 }
1da177e4
LT
1888}
1889
1890
1891/*
1892 * lbmAllocate()
1893 *
1894 * allocate an empty log buffer
1895 */
1896static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1897{
1898 struct lbuf *bp;
1899 unsigned long flags;
1900
1901 /*
1902 * recycle from log buffer freelist if any
1903 */
1904 LCACHE_LOCK(flags);
1905 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags);
1906 log->lbuf_free = bp->l_freelist;
1907 LCACHE_UNLOCK(flags);
1908
1909 bp->l_flag = 0;
1910
1911 bp->l_wqnext = NULL;
1912 bp->l_freelist = NULL;
1913
1914 bp->l_pn = pn;
1915 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1916 bp->l_ceor = 0;
1917
1918 return bp;
1919}
1920
1921
1922/*
1923 * lbmFree()
1924 *
1925 * release a log buffer to freelist
1926 */
1927static void lbmFree(struct lbuf * bp)
1928{
1929 unsigned long flags;
1930
1931 LCACHE_LOCK(flags);
1932
1933 lbmfree(bp);
1934
1935 LCACHE_UNLOCK(flags);
1936}
1937
1938static void lbmfree(struct lbuf * bp)
1939{
1940 struct jfs_log *log = bp->l_log;
1941
1942 assert(bp->l_wqnext == NULL);
1943
1944 /*
1945 * return the buffer to head of freelist
1946 */
1947 bp->l_freelist = log->lbuf_free;
1948 log->lbuf_free = bp;
1949
1950 wake_up(&log->free_wait);
1951 return;
1952}
1953
1954
1955/*
1956 * NAME: lbmRedrive
1957 *
59c51591 1958 * FUNCTION: add a log buffer to the log redrive list
1da177e4
LT
1959 *
1960 * PARAMETER:
f720e3ba 1961 * bp - log buffer
1da177e4
LT
1962 *
1963 * NOTES:
1964 * Takes log_redrive_lock.
1965 */
1966static inline void lbmRedrive(struct lbuf *bp)
1967{
1968 unsigned long flags;
1969
1970 spin_lock_irqsave(&log_redrive_lock, flags);
1971 bp->l_redrive_next = log_redrive_list;
1972 log_redrive_list = bp;
1973 spin_unlock_irqrestore(&log_redrive_lock, flags);
1974
91dbb4de 1975 wake_up_process(jfsIOthread);
1da177e4
LT
1976}
1977
1978
1979/*
1980 * lbmRead()
1981 */
1982static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1983{
1984 struct bio *bio;
1985 struct lbuf *bp;
1986
1987 /*
1988 * allocate a log buffer
1989 */
1990 *bpp = bp = lbmAllocate(log, pn);
1991 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
1992
1993 bp->l_flag |= lbmREAD;
1994
1995 bio = bio_alloc(GFP_NOFS, 1);
1996
4f024f37 1997 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
1da177e4 1998 bio->bi_bdev = log->bdev;
1da177e4 1999
6cf66b4c
KO
2000 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2001 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
1da177e4
LT
2002
2003 bio->bi_end_io = lbmIODone;
2004 bio->bi_private = bp;
70fd7614 2005 bio->bi_opf = REQ_OP_READ;
95bbb82f
GZ
2006 /*check if journaling to disk has been disabled*/
2007 if (log->no_integrity) {
4f024f37 2008 bio->bi_iter.bi_size = 0;
4246a0b6 2009 lbmIODone(bio);
95bbb82f 2010 } else {
4e49ea4a 2011 submit_bio(bio);
95bbb82f 2012 }
1da177e4
LT
2013
2014 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2015
2016 return 0;
2017}
2018
2019
2020/*
2021 * lbmWrite()
2022 *
2023 * buffer at head of pageout queue stays after completion of
2024 * partial-page pageout and redriven by explicit initiation of
2025 * pageout by caller until full-page pageout is completed and
2026 * released.
2027 *
2028 * device driver i/o done redrives pageout of new buffer at
2029 * head of pageout queue when current buffer at head of pageout
2030 * queue is released at the completion of its full-page pageout.
2031 *
2032 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2033 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2034 */
2035static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2036 int cant_block)
2037{
2038 struct lbuf *tail;
2039 unsigned long flags;
2040
2041 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2042
2043 /* map the logical block address to physical block address */
2044 bp->l_blkno =
2045 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2046
2047 LCACHE_LOCK(flags); /* disable+lock */
2048
2049 /*
2050 * initialize buffer for device driver
2051 */
2052 bp->l_flag = flag;
2053
2054 /*
f720e3ba 2055 * insert bp at tail of write queue associated with log
1da177e4
LT
2056 *
2057 * (request is either for bp already/currently at head of queue
2058 * or new bp to be inserted at tail)
2059 */
2060 tail = log->wqueue;
2061
2062 /* is buffer not already on write queue ? */
2063 if (bp->l_wqnext == NULL) {
2064 /* insert at tail of wqueue */
2065 if (tail == NULL) {
2066 log->wqueue = bp;
2067 bp->l_wqnext = bp;
2068 } else {
2069 log->wqueue = bp;
2070 bp->l_wqnext = tail->l_wqnext;
2071 tail->l_wqnext = bp;
2072 }
2073
2074 tail = bp;
2075 }
2076
2077 /* is buffer at head of wqueue and for write ? */
2078 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) {
2079 LCACHE_UNLOCK(flags); /* unlock+enable */
2080 return;
2081 }
2082
2083 LCACHE_UNLOCK(flags); /* unlock+enable */
2084
2085 if (cant_block)
2086 lbmRedrive(bp);
2087 else if (flag & lbmSYNC)
2088 lbmStartIO(bp);
2089 else {
2090 LOGGC_UNLOCK(log);
2091 lbmStartIO(bp);
2092 LOGGC_LOCK(log);
2093 }
2094}
2095
2096
2097/*
2098 * lbmDirectWrite()
2099 *
2100 * initiate pageout bypassing write queue for sidestream
2101 * (e.g., log superblock) write;
2102 */
2103static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2104{
2105 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2106 bp, flag, bp->l_pn);
2107
2108 /*
2109 * initialize buffer for device driver
2110 */
2111 bp->l_flag = flag | lbmDIRECT;
2112
2113 /* map the logical block address to physical block address */
2114 bp->l_blkno =
2115 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2116
2117 /*
f720e3ba 2118 * initiate pageout of the page
1da177e4
LT
2119 */
2120 lbmStartIO(bp);
2121}
2122
2123
2124/*
2125 * NAME: lbmStartIO()
2126 *
2127 * FUNCTION: Interface to DD strategy routine
2128 *
f720e3ba 2129 * RETURN: none
1da177e4
LT
2130 *
2131 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2132 */
2133static void lbmStartIO(struct lbuf * bp)
2134{
2135 struct bio *bio;
2136 struct jfs_log *log = bp->l_log;
2137
b18db6de 2138 jfs_info("lbmStartIO");
1da177e4
LT
2139
2140 bio = bio_alloc(GFP_NOFS, 1);
4f024f37 2141 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
1da177e4 2142 bio->bi_bdev = log->bdev;
1da177e4 2143
6cf66b4c
KO
2144 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2145 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
1da177e4
LT
2146
2147 bio->bi_end_io = lbmIODone;
2148 bio->bi_private = bp;
70fd7614 2149 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC;
1da177e4
LT
2150
2151 /* check if journaling to disk has been disabled */
dc5798d9 2152 if (log->no_integrity) {
4f024f37 2153 bio->bi_iter.bi_size = 0;
4246a0b6 2154 lbmIODone(bio);
dc5798d9 2155 } else {
4e49ea4a 2156 submit_bio(bio);
1da177e4
LT
2157 INCREMENT(lmStat.submitted);
2158 }
1da177e4
LT
2159}
2160
2161
2162/*
2163 * lbmIOWait()
2164 */
2165static int lbmIOWait(struct lbuf * bp, int flag)
2166{
2167 unsigned long flags;
2168 int rc = 0;
2169
2170 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2171
2172 LCACHE_LOCK(flags); /* disable+lock */
2173
2174 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2175
2176 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2177
2178 if (flag & lbmFREE)
2179 lbmfree(bp);
2180
2181 LCACHE_UNLOCK(flags); /* unlock+enable */
2182
2183 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2184 return rc;
2185}
2186
2187/*
2188 * lbmIODone()
2189 *
2190 * executed at INTIODONE level
2191 */
4246a0b6 2192static void lbmIODone(struct bio *bio)
1da177e4
LT
2193{
2194 struct lbuf *bp = bio->bi_private;
2195 struct lbuf *nextbp, *tail;
2196 struct jfs_log *log;
2197 unsigned long flags;
2198
1da177e4
LT
2199 /*
2200 * get back jfs buffer bound to the i/o buffer
2201 */
2202 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2203
2204 LCACHE_LOCK(flags); /* disable+lock */
2205
2206 bp->l_flag |= lbmDONE;
2207
4246a0b6 2208 if (bio->bi_error) {
1da177e4
LT
2209 bp->l_flag |= lbmERROR;
2210
2211 jfs_err("lbmIODone: I/O error in JFS log");
2212 }
2213
2214 bio_put(bio);
2215
2216 /*
f720e3ba 2217 * pagein completion
1da177e4
LT
2218 */
2219 if (bp->l_flag & lbmREAD) {
2220 bp->l_flag &= ~lbmREAD;
2221
2222 LCACHE_UNLOCK(flags); /* unlock+enable */
2223
2224 /* wakeup I/O initiator */
2225 LCACHE_WAKEUP(&bp->l_ioevent);
8d8fe642
DK
2226
2227 return;
1da177e4
LT
2228 }
2229
2230 /*
f720e3ba 2231 * pageout completion
1da177e4
LT
2232 *
2233 * the bp at the head of write queue has completed pageout.
2234 *
2235 * if single-commit/full-page pageout, remove the current buffer
2236 * from head of pageout queue, and redrive pageout with
2237 * the new buffer at head of pageout queue;
2238 * otherwise, the partial-page pageout buffer stays at
2239 * the head of pageout queue to be redriven for pageout
2240 * by lmGroupCommit() until full-page pageout is completed.
2241 */
2242 bp->l_flag &= ~lbmWRITE;
2243 INCREMENT(lmStat.pagedone);
2244
2245 /* update committed lsn */
2246 log = bp->l_log;
2247 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2248
2249 if (bp->l_flag & lbmDIRECT) {
2250 LCACHE_WAKEUP(&bp->l_ioevent);
2251 LCACHE_UNLOCK(flags);
8d8fe642 2252 return;
1da177e4
LT
2253 }
2254
2255 tail = log->wqueue;
2256
2257 /* single element queue */
2258 if (bp == tail) {
2259 /* remove head buffer of full-page pageout
2260 * from log device write queue
2261 */
2262 if (bp->l_flag & lbmRELEASE) {
2263 log->wqueue = NULL;
2264 bp->l_wqnext = NULL;
2265 }
2266 }
2267 /* multi element queue */
2268 else {
2269 /* remove head buffer of full-page pageout
2270 * from log device write queue
2271 */
2272 if (bp->l_flag & lbmRELEASE) {
2273 nextbp = tail->l_wqnext = bp->l_wqnext;
2274 bp->l_wqnext = NULL;
2275
2276 /*
2277 * redrive pageout of next page at head of write queue:
2278 * redrive next page without any bound tblk
2279 * (i.e., page w/o any COMMIT records), or
2280 * first page of new group commit which has been
2281 * queued after current page (subsequent pageout
2282 * is performed synchronously, except page without
2283 * any COMMITs) by lmGroupCommit() as indicated
2284 * by lbmWRITE flag;
2285 */
2286 if (nextbp->l_flag & lbmWRITE) {
2287 /*
2288 * We can't do the I/O at interrupt time.
2289 * The jfsIO thread can do it
2290 */
2291 lbmRedrive(nextbp);
2292 }
2293 }
2294 }
2295
2296 /*
f720e3ba 2297 * synchronous pageout:
1da177e4
LT
2298 *
2299 * buffer has not necessarily been removed from write queue
2300 * (e.g., synchronous write of partial-page with COMMIT):
2301 * leave buffer for i/o initiator to dispose
2302 */
2303 if (bp->l_flag & lbmSYNC) {
2304 LCACHE_UNLOCK(flags); /* unlock+enable */
2305
2306 /* wakeup I/O initiator */
2307 LCACHE_WAKEUP(&bp->l_ioevent);
2308 }
2309
2310 /*
f720e3ba 2311 * Group Commit pageout:
1da177e4
LT
2312 */
2313 else if (bp->l_flag & lbmGC) {
2314 LCACHE_UNLOCK(flags);
2315 lmPostGC(bp);
2316 }
2317
2318 /*
f720e3ba 2319 * asynchronous pageout:
1da177e4
LT
2320 *
2321 * buffer must have been removed from write queue:
2322 * insert buffer at head of freelist where it can be recycled
2323 */
2324 else {
2325 assert(bp->l_flag & lbmRELEASE);
2326 assert(bp->l_flag & lbmFREE);
2327 lbmfree(bp);
2328
2329 LCACHE_UNLOCK(flags); /* unlock+enable */
2330 }
1da177e4
LT
2331}
2332
2333int jfsIOWait(void *arg)
2334{
2335 struct lbuf *bp;
2336
1da177e4 2337 do {
1da177e4 2338 spin_lock_irq(&log_redrive_lock);
09aaa749 2339 while ((bp = log_redrive_list)) {
1da177e4
LT
2340 log_redrive_list = bp->l_redrive_next;
2341 bp->l_redrive_next = NULL;
2342 spin_unlock_irq(&log_redrive_lock);
2343 lbmStartIO(bp);
2344 spin_lock_irq(&log_redrive_lock);
2345 }
91dbb4de 2346
3e1d1d28 2347 if (freezing(current)) {
05ec9e26 2348 spin_unlock_irq(&log_redrive_lock);
a0acae0e 2349 try_to_freeze();
1da177e4 2350 } else {
1da177e4 2351 set_current_state(TASK_INTERRUPTIBLE);
05ec9e26 2352 spin_unlock_irq(&log_redrive_lock);
1da177e4 2353 schedule();
1da177e4 2354 }
91dbb4de 2355 } while (!kthread_should_stop());
1da177e4
LT
2356
2357 jfs_info("jfsIOWait being killed!");
91dbb4de 2358 return 0;
1da177e4
LT
2359}
2360
2361/*
2362 * NAME: lmLogFormat()/jfs_logform()
2363 *
2364 * FUNCTION: format file system log
2365 *
2366 * PARAMETERS:
f720e3ba 2367 * log - volume log
1da177e4
LT
2368 * logAddress - start address of log space in FS block
2369 * logSize - length of log space in FS block;
2370 *
2371 * RETURN: 0 - success
2372 * -EIO - i/o error
2373 *
2374 * XXX: We're synchronously writing one page at a time. This needs to
2375 * be improved by writing multiple pages at once.
2376 */
2377int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
2378{
2379 int rc = -EIO;
2380 struct jfs_sb_info *sbi;
2381 struct logsuper *logsuper;
2382 struct logpage *lp;
2383 int lspn; /* log sequence page number */
2384 struct lrd *lrd_ptr;
2385 int npages = 0;
2386 struct lbuf *bp;
2387
2388 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2389 (long long)logAddress, logSize);
2390
2391 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2392
2393 /* allocate a log buffer */
2394 bp = lbmAllocate(log, 1);
2395
2396 npages = logSize >> sbi->l2nbperpage;
2397
2398 /*
f720e3ba 2399 * log space:
1da177e4
LT
2400 *
2401 * page 0 - reserved;
2402 * page 1 - log superblock;
2403 * page 2 - log data page: A SYNC log record is written
f720e3ba 2404 * into this page at logform time;
1da177e4
LT
2405 * pages 3-N - log data page: set to empty log data pages;
2406 */
2407 /*
f720e3ba 2408 * init log superblock: log page 1
1da177e4
LT
2409 */
2410 logsuper = (struct logsuper *) bp->l_ldata;
2411
2412 logsuper->magic = cpu_to_le32(LOGMAGIC);
2413 logsuper->version = cpu_to_le32(LOGVERSION);
2414 logsuper->state = cpu_to_le32(LOGREDONE);
2415 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */
2416 logsuper->size = cpu_to_le32(npages);
2417 logsuper->bsize = cpu_to_le32(sbi->bsize);
2418 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
2419 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
2420
2421 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2422 bp->l_blkno = logAddress + sbi->nbperpage;
2423 lbmStartIO(bp);
2424 if ((rc = lbmIOWait(bp, 0)))
2425 goto exit;
2426
2427 /*
f720e3ba 2428 * init pages 2 to npages-1 as log data pages:
1da177e4
LT
2429 *
2430 * log page sequence number (lpsn) initialization:
2431 *
2432 * pn: 0 1 2 3 n-1
2433 * +-----+-----+=====+=====+===.....===+=====+
2434 * lspn: N-1 0 1 N-2
2435 * <--- N page circular file ---->
2436 *
2437 * the N (= npages-2) data pages of the log is maintained as
2438 * a circular file for the log records;
2439 * lpsn grows by 1 monotonically as each log page is written
2440 * to the circular file of the log;
2441 * and setLogpage() will not reset the page number even if
2442 * the eor is equal to LOGPHDRSIZE. In order for binary search
2443 * still work in find log end process, we have to simulate the
2444 * log wrap situation at the log format time.
2445 * The 1st log page written will have the highest lpsn. Then
2446 * the succeeding log pages will have ascending order of
2447 * the lspn starting from 0, ... (N-2)
2448 */
2449 lp = (struct logpage *) bp->l_ldata;
2450 /*
2451 * initialize 1st log page to be written: lpsn = N - 1,
2452 * write a SYNCPT log record is written to this page
2453 */
2454 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2455 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
2456
2457 lrd_ptr = (struct lrd *) &lp->data;
2458 lrd_ptr->logtid = 0;
2459 lrd_ptr->backchain = 0;
2460 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT);
2461 lrd_ptr->length = 0;
2462 lrd_ptr->log.syncpt.sync = 0;
2463
2464 bp->l_blkno += sbi->nbperpage;
2465 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2466 lbmStartIO(bp);
2467 if ((rc = lbmIOWait(bp, 0)))
2468 goto exit;
2469
2470 /*
f720e3ba 2471 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
1da177e4
LT
2472 */
2473 for (lspn = 0; lspn < npages - 3; lspn++) {
2474 lp->h.page = lp->t.page = cpu_to_le32(lspn);
2475 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
2476
2477 bp->l_blkno += sbi->nbperpage;
2478 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2479 lbmStartIO(bp);
2480 if ((rc = lbmIOWait(bp, 0)))
2481 goto exit;
2482 }
2483
2484 rc = 0;
2485exit:
2486 /*
f720e3ba 2487 * finalize log
1da177e4
LT
2488 */
2489 /* release the buffer */
2490 lbmFree(bp);
2491
2492 return rc;
2493}
2494
2495#ifdef CONFIG_JFS_STATISTICS
b2e03ca7 2496static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
1da177e4 2497{
b2e03ca7 2498 seq_printf(m,
1da177e4
LT
2499 "JFS Logmgr stats\n"
2500 "================\n"
2501 "commits = %d\n"
2502 "writes submitted = %d\n"
2503 "writes completed = %d\n"
2504 "full pages submitted = %d\n"
2505 "partial pages submitted = %d\n",
2506 lmStat.commit,
2507 lmStat.submitted,
2508 lmStat.pagedone,
2509 lmStat.full_page,
2510 lmStat.partial_page);
b2e03ca7
AD
2511 return 0;
2512}
1da177e4 2513
b2e03ca7
AD
2514static int jfs_lmstats_proc_open(struct inode *inode, struct file *file)
2515{
2516 return single_open(file, jfs_lmstats_proc_show, NULL);
1da177e4 2517}
b2e03ca7
AD
2518
2519const struct file_operations jfs_lmstats_proc_fops = {
b2e03ca7
AD
2520 .open = jfs_lmstats_proc_open,
2521 .read = seq_read,
2522 .llseek = seq_lseek,
2523 .release = single_release,
2524};
1da177e4 2525#endif /* CONFIG_JFS_STATISTICS */