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
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/completion.h>
66 #include <linux/kthread.h>
67 #include <linux/buffer_head.h> /* for sync_blockdev() */
68 #include <linux/bio.h>
69 #include <linux/freezer.h>
70 #include <linux/export.h>
71 #include <linux/delay.h>
72 #include <linux/mutex.h>
73 #include <linux/seq_file.h>
74 #include <linux/slab.h>
75 #include "jfs_incore.h"
76 #include "jfs_filsys.h"
77 #include "jfs_metapage.h"
78 #include "jfs_superblock.h"
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 */
86 static struct lbuf *log_redrive_list;
87 static DEFINE_SPINLOCK(log_redrive_lock);
88
89
90 /*
91 * log read/write serialization (per log)
92 */
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))
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 */
121 static 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) \
130 do { \
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 */
169 static LIST_HEAD(jfs_external_logs);
170 static struct jfs_log *dummy_log;
171 static DEFINE_MUTEX(jfs_log_mutex);
172
173 /*
174 * forward references
175 */
176 static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
177 struct lrd * lrd, struct tlock * tlck);
178
179 static int lmNextPage(struct jfs_log * log);
180 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
181 int activate);
182
183 static int open_inline_log(struct super_block *sb);
184 static int open_dummy_log(struct super_block *sb);
185 static int lbmLogInit(struct jfs_log * log);
186 static void lbmLogShutdown(struct jfs_log * log);
187 static struct lbuf *lbmAllocate(struct jfs_log * log, int);
188 static void lbmFree(struct lbuf * bp);
189 static void lbmfree(struct lbuf * bp);
190 static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);
191 static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block);
192 static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag);
193 static int lbmIOWait(struct lbuf * bp, int flag);
194 static bio_end_io_t lbmIODone;
195 static void lbmStartIO(struct lbuf * bp);
196 static void lmGCwrite(struct jfs_log * log, int cant_block);
197 static int lmLogSync(struct jfs_log * log, int hard_sync);
198
199
200
201 /*
202 * statistics
203 */
204 #ifdef CONFIG_JFS_STATISTICS
205 static 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
write_special_inodes(struct jfs_log * log,int (* writer)(struct address_space *))214 static 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 }
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 */
lmLog(struct jfs_log * log,struct tblock * tblk,struct lrd * lrd,struct tlock * tlck)238 int 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;
244 unsigned long flags;
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 /*
261 * initialize/update page/transaction recovery lsn
262 */
263 lsn = log->lsn;
264
265 LOGSYNC_LOCK(log, flags);
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 /*
280 * initialize/update lsn of tblock of the page
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
321 LOGSYNC_UNLOCK(log, flags);
322
323 /*
324 * write the log record
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
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
353 *
354 * serialization: LOG_LOCK() held on entry/exit
355 */
356 static int
lmWriteRecord(struct jfs_log * log,struct tblock * tblk,struct lrd * lrd,struct tlock * tlck)357 lmWriteRecord(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 /*
389 * move log record data
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 /*
482 * move log record descriptor
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
570 *
571 * serialization: LOG_LOCK() held on entry/exit
572 */
lmNextPage(struct jfs_log * log)573 static 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 /*
591 * write or queue the full page at the tail of write queue
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 /*
642 * allocate/initialize next page
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 *
672 * RETURN:
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 */
lmGroupCommit(struct jfs_log * log,struct tblock * tblk)679 int 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 */
lmGCwrite(struct jfs_log * log,int cant_write)758 static 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 */
lmPostGC(struct lbuf * bp)823 static 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).
932 * calculate new value of i_nextsync which determines when
933 * this code is called again.
934 *
935 * PARAMETERS: log - log structure
936 * hard_sync - 1 to force all metadata to be written
937 *
938 * RETURN: 0
939 *
940 * serialization: LOG_LOCK() held on entry/exit
941 */
lmLogSync(struct jfs_log * log,int hard_sync)942 static int lmLogSync(struct jfs_log * log, int hard_sync)
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;
952 unsigned long flags;
953
954 /* push dirty metapages out to disk */
955 if (hard_sync)
956 write_special_inodes(log, filemap_fdatawrite);
957 else
958 write_special_inodes(log, filemap_flush);
959
960 /*
961 * forward syncpt
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) {
968 LOGSYNC_LOCK(log, flags);
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 }
976 LOGSYNC_UNLOCK(log, flags);
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) {
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 /*
997 * setup next syncpt trigger (SWAG)
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 /*
1008 * log wrapping
1009 *
1010 * option 1 - panic ? No.!
1011 * option 2 - shutdown file systems
1012 * associated with log ?
1013 * option 3 - extend log ?
1014 * option 4 - second chance
1015 *
1016 * mark log wrapped, and continue.
1017 * when all active transactions are completed,
1018 * mark log valid for recovery.
1019 * if crashed during invalid state, log state
1020 * implies invalid log, forcing fsck().
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
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 */
1037 if (!test_bit(log_SYNCBARRIER, &log->flag) &&
1038 (written > LOGSYNC_BARRIER(logsize)) && log->active) {
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
1051 /*
1052 * NAME: jfs_syncpt
1053 *
1054 * FUNCTION: write log SYNCPT record for specified log
1055 *
1056 * PARAMETERS: log - log structure
1057 * hard_sync - set to 1 to force metadata to be written
1058 */
jfs_syncpt(struct jfs_log * log,int hard_sync)1059 void jfs_syncpt(struct jfs_log *log, int hard_sync)
1060 { LOG_LOCK(log);
1061 if (!test_bit(log_QUIESCE, &log->flag))
1062 lmLogSync(log, hard_sync);
1063 LOG_UNLOCK(log);
1064 }
1065
1066 /*
1067 * NAME: lmLogOpen()
1068 *
1069 * FUNCTION: open the log on first open;
1070 * insert filesystem in the active list of the log.
1071 *
1072 * PARAMETER: ipmnt - file system mount inode
1073 * iplog - log inode (out)
1074 *
1075 * RETURN:
1076 *
1077 * serialization:
1078 */
lmLogOpen(struct super_block * sb)1079 int 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);
1088
1089 if (sbi->mntflag & JFS_INLINELOG)
1090 return open_inline_log(sb);
1091
1092 mutex_lock(&jfs_log_mutex);
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))) {
1097 jfs_warn("wrong uuid on JFS journal");
1098 mutex_unlock(&jfs_log_mutex);
1099 return -EINVAL;
1100 }
1101 /*
1102 * add file system to log active file system list
1103 */
1104 if ((rc = lmLogFileSystem(log, sbi, 1))) {
1105 mutex_unlock(&jfs_log_mutex);
1106 return rc;
1107 }
1108 goto journal_found;
1109 }
1110 }
1111
1112 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
1113 mutex_unlock(&jfs_log_mutex);
1114 return -ENOMEM;
1115 }
1116 INIT_LIST_HEAD(&log->sb_list);
1117 init_waitqueue_head(&log->syncwait);
1118
1119 /*
1120 * external log as separate logical volume
1121 *
1122 * file systems to log may have n-to-1 relationship;
1123 */
1124
1125 bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1126 log);
1127 if (IS_ERR(bdev)) {
1128 rc = PTR_ERR(bdev);
1129 goto free;
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 close;
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
1149 journal_found:
1150 LOG_LOCK(log);
1151 list_add(&sbi->log_list, &log->sb_list);
1152 sbi->log = log;
1153 LOG_UNLOCK(log);
1154
1155 mutex_unlock(&jfs_log_mutex);
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 close: /* close external log device */
1166 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1167
1168 free: /* free log descriptor */
1169 mutex_unlock(&jfs_log_mutex);
1170 kfree(log);
1171
1172 jfs_warn("lmLogOpen: exit(%d)", rc);
1173 return rc;
1174 }
1175
open_inline_log(struct super_block * sb)1176 static int open_inline_log(struct super_block *sb)
1177 {
1178 struct jfs_log *log;
1179 int rc;
1180
1181 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL)))
1182 return -ENOMEM;
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
open_dummy_log(struct super_block * sb)1209 static int open_dummy_log(struct super_block *sb)
1210 {
1211 int rc;
1212
1213 mutex_lock(&jfs_log_mutex);
1214 if (!dummy_log) {
1215 dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL);
1216 if (!dummy_log) {
1217 mutex_unlock(&jfs_log_mutex);
1218 return -ENOMEM;
1219 }
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;
1230 mutex_unlock(&jfs_log_mutex);
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);
1239 mutex_unlock(&jfs_log_mutex);
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.
1253 *
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()
1259 *
1260 * serialization: single first open thread
1261 */
lmLogInit(struct jfs_log * log)1262 int 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;
1297
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 }
1336 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx size:0x%x",
1337 log, (unsigned long long)log->base, log->size);
1338 } else {
1339 if (memcmp(logsuper->uuid, log->uuid, 16)) {
1340 jfs_warn("wrong uuid on JFS log device");
1341 rc = -EINVAL;
1342 goto errout20;
1343 }
1344 log->size = le32_to_cpu(logsuper->size);
1345 log->l2bsize = le32_to_cpu(logsuper->l2bsize);
1346 jfs_info("lmLogInit: external log:0x%p base:0x%Lx size:0x%x",
1347 log, (unsigned long long)log->base, log->size);
1348 }
1349
1350 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
1351 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
1352
1353 /*
1354 * initialize for log append write mode
1355 */
1356 /* establish current/end-of-log page/buffer */
1357 if ((rc = lbmRead(log, log->page, &bp)))
1358 goto errout20;
1359
1360 lp = (struct logpage *) bp->l_ldata;
1361
1362 jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d",
1363 le32_to_cpu(logsuper->end), log->page, log->eor,
1364 le16_to_cpu(lp->h.eor));
1365
1366 log->bp = bp;
1367 bp->l_pn = log->page;
1368 bp->l_eor = log->eor;
1369
1370 /* if current page is full, move on to next page */
1371 if (log->eor >= LOGPSIZE - LOGPTLRSIZE)
1372 lmNextPage(log);
1373
1374 /*
1375 * initialize log syncpoint
1376 */
1377 /*
1378 * write the first SYNCPT record with syncpoint = 0
1379 * (i.e., log redo up to HERE !);
1380 * remove current page from lbm write queue at end of pageout
1381 * (to write log superblock update), but do not release to
1382 * freelist;
1383 */
1384 lrd.logtid = 0;
1385 lrd.backchain = 0;
1386 lrd.type = cpu_to_le16(LOG_SYNCPT);
1387 lrd.length = 0;
1388 lrd.log.syncpt.sync = 0;
1389 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1390 bp = log->bp;
1391 bp->l_ceor = bp->l_eor;
1392 lp = (struct logpage *) bp->l_ldata;
1393 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1394 lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0);
1395 if ((rc = lbmIOWait(bp, 0)))
1396 goto errout30;
1397
1398 /*
1399 * update/write superblock
1400 */
1401 logsuper->state = cpu_to_le32(LOGMOUNT);
1402 log->serial = le32_to_cpu(logsuper->serial) + 1;
1403 logsuper->serial = cpu_to_le32(log->serial);
1404 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1405 if ((rc = lbmIOWait(bpsuper, lbmFREE)))
1406 goto errout30;
1407 }
1408
1409 /* initialize logsync parameters */
1410 log->logsize = (log->size - 2) << L2LOGPSIZE;
1411 log->lsn = lsn;
1412 log->syncpt = lsn;
1413 log->sync = log->syncpt;
1414 log->nextsync = LOGSYNC_DELTA(log->logsize);
1415
1416 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x",
1417 log->lsn, log->syncpt, log->sync);
1418
1419 /*
1420 * initialize for lazy/group commit
1421 */
1422 log->clsn = lsn;
1423
1424 return 0;
1425
1426 /*
1427 * unwind on error
1428 */
1429 errout30: /* release log page */
1430 log->wqueue = NULL;
1431 bp->l_wqnext = NULL;
1432 lbmFree(bp);
1433
1434 errout20: /* release log superblock */
1435 lbmFree(bpsuper);
1436
1437 errout10: /* unwind lbmLogInit() */
1438 lbmLogShutdown(log);
1439
1440 jfs_warn("lmLogInit: exit(%d)", rc);
1441 return rc;
1442 }
1443
1444
1445 /*
1446 * NAME: lmLogClose()
1447 *
1448 * FUNCTION: remove file system <ipmnt> from active list of log <iplog>
1449 * and close it on last close.
1450 *
1451 * PARAMETER: sb - superblock
1452 *
1453 * RETURN: errors from subroutines
1454 *
1455 * serialization:
1456 */
lmLogClose(struct super_block * sb)1457 int lmLogClose(struct super_block *sb)
1458 {
1459 struct jfs_sb_info *sbi = JFS_SBI(sb);
1460 struct jfs_log *log = sbi->log;
1461 struct block_device *bdev;
1462 int rc = 0;
1463
1464 jfs_info("lmLogClose: log:0x%p", log);
1465
1466 mutex_lock(&jfs_log_mutex);
1467 LOG_LOCK(log);
1468 list_del(&sbi->log_list);
1469 LOG_UNLOCK(log);
1470 sbi->log = NULL;
1471
1472 /*
1473 * We need to make sure all of the "written" metapages
1474 * actually make it to disk
1475 */
1476 sync_blockdev(sb->s_bdev);
1477
1478 if (test_bit(log_INLINELOG, &log->flag)) {
1479 /*
1480 * in-line log in host file system
1481 */
1482 rc = lmLogShutdown(log);
1483 kfree(log);
1484 goto out;
1485 }
1486
1487 if (!log->no_integrity)
1488 lmLogFileSystem(log, sbi, 0);
1489
1490 if (!list_empty(&log->sb_list))
1491 goto out;
1492
1493 /*
1494 * TODO: ensure that the dummy_log is in a state to allow
1495 * lbmLogShutdown to deallocate all the buffers and call
1496 * kfree against dummy_log. For now, leave dummy_log & its
1497 * buffers in memory, and resuse if another no-integrity mount
1498 * is requested.
1499 */
1500 if (log->no_integrity)
1501 goto out;
1502
1503 /*
1504 * external log as separate logical volume
1505 */
1506 list_del(&log->journal_list);
1507 bdev = log->bdev;
1508 rc = lmLogShutdown(log);
1509
1510 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1511
1512 kfree(log);
1513
1514 out:
1515 mutex_unlock(&jfs_log_mutex);
1516 jfs_info("lmLogClose: exit(%d)", rc);
1517 return rc;
1518 }
1519
1520
1521 /*
1522 * NAME: jfs_flush_journal()
1523 *
1524 * FUNCTION: initiate write of any outstanding transactions to the journal
1525 * and optionally wait until they are all written to disk
1526 *
1527 * wait == 0 flush until latest txn is committed, don't wait
1528 * wait == 1 flush until latest txn is committed, wait
1529 * wait > 1 flush until all txn's are complete, wait
1530 */
jfs_flush_journal(struct jfs_log * log,int wait)1531 void jfs_flush_journal(struct jfs_log *log, int wait)
1532 {
1533 int i;
1534 struct tblock *target = NULL;
1535
1536 /* jfs_write_inode may call us during read-only mount */
1537 if (!log)
1538 return;
1539
1540 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait);
1541
1542 LOGGC_LOCK(log);
1543
1544 if (!list_empty(&log->cqueue)) {
1545 /*
1546 * This ensures that we will keep writing to the journal as long
1547 * as there are unwritten commit records
1548 */
1549 target = list_entry(log->cqueue.prev, struct tblock, cqueue);
1550
1551 if (test_bit(log_FLUSH, &log->flag)) {
1552 /*
1553 * We're already flushing.
1554 * if flush_tblk is NULL, we are flushing everything,
1555 * so leave it that way. Otherwise, update it to the
1556 * latest transaction
1557 */
1558 if (log->flush_tblk)
1559 log->flush_tblk = target;
1560 } else {
1561 /* Only flush until latest transaction is committed */
1562 log->flush_tblk = target;
1563 set_bit(log_FLUSH, &log->flag);
1564
1565 /*
1566 * Initiate I/O on outstanding transactions
1567 */
1568 if (!(log->cflag & logGC_PAGEOUT)) {
1569 log->cflag |= logGC_PAGEOUT;
1570 lmGCwrite(log, 0);
1571 }
1572 }
1573 }
1574 if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) {
1575 /* Flush until all activity complete */
1576 set_bit(log_FLUSH, &log->flag);
1577 log->flush_tblk = NULL;
1578 }
1579
1580 if (wait && target && !(target->flag & tblkGC_COMMITTED)) {
1581 DECLARE_WAITQUEUE(__wait, current);
1582
1583 add_wait_queue(&target->gcwait, &__wait);
1584 set_current_state(TASK_UNINTERRUPTIBLE);
1585 LOGGC_UNLOCK(log);
1586 schedule();
1587 LOGGC_LOCK(log);
1588 remove_wait_queue(&target->gcwait, &__wait);
1589 }
1590 LOGGC_UNLOCK(log);
1591
1592 if (wait < 2)
1593 return;
1594
1595 write_special_inodes(log, filemap_fdatawrite);
1596
1597 /*
1598 * If there was recent activity, we may need to wait
1599 * for the lazycommit thread to catch up
1600 */
1601 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
1602 for (i = 0; i < 200; i++) { /* Too much? */
1603 msleep(250);
1604 write_special_inodes(log, filemap_fdatawrite);
1605 if (list_empty(&log->cqueue) &&
1606 list_empty(&log->synclist))
1607 break;
1608 }
1609 }
1610 assert(list_empty(&log->cqueue));
1611
1612 #ifdef CONFIG_JFS_DEBUG
1613 if (!list_empty(&log->synclist)) {
1614 struct logsyncblk *lp;
1615
1616 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n");
1617 list_for_each_entry(lp, &log->synclist, synclist) {
1618 if (lp->xflag & COMMIT_PAGE) {
1619 struct metapage *mp = (struct metapage *)lp;
1620 print_hex_dump(KERN_ERR, "metapage: ",
1621 DUMP_PREFIX_ADDRESS, 16, 4,
1622 mp, sizeof(struct metapage), 0);
1623 print_hex_dump(KERN_ERR, "page: ",
1624 DUMP_PREFIX_ADDRESS, 16,
1625 sizeof(long), mp->page,
1626 sizeof(struct page), 0);
1627 } else
1628 print_hex_dump(KERN_ERR, "tblock:",
1629 DUMP_PREFIX_ADDRESS, 16, 4,
1630 lp, sizeof(struct tblock), 0);
1631 }
1632 }
1633 #else
1634 WARN_ON(!list_empty(&log->synclist));
1635 #endif
1636 clear_bit(log_FLUSH, &log->flag);
1637 }
1638
1639 /*
1640 * NAME: lmLogShutdown()
1641 *
1642 * FUNCTION: log shutdown at last LogClose().
1643 *
1644 * write log syncpt record.
1645 * update super block to set redone flag to 0.
1646 *
1647 * PARAMETER: log - log inode
1648 *
1649 * RETURN: 0 - success
1650 *
1651 * serialization: single last close thread
1652 */
lmLogShutdown(struct jfs_log * log)1653 int lmLogShutdown(struct jfs_log * log)
1654 {
1655 int rc;
1656 struct lrd lrd;
1657 int lsn;
1658 struct logsuper *logsuper;
1659 struct lbuf *bpsuper;
1660 struct lbuf *bp;
1661 struct logpage *lp;
1662
1663 jfs_info("lmLogShutdown: log:0x%p", log);
1664
1665 jfs_flush_journal(log, 2);
1666
1667 /*
1668 * write the last SYNCPT record with syncpoint = 0
1669 * (i.e., log redo up to HERE !)
1670 */
1671 lrd.logtid = 0;
1672 lrd.backchain = 0;
1673 lrd.type = cpu_to_le16(LOG_SYNCPT);
1674 lrd.length = 0;
1675 lrd.log.syncpt.sync = 0;
1676
1677 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1678 bp = log->bp;
1679 lp = (struct logpage *) bp->l_ldata;
1680 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1681 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
1682 lbmIOWait(log->bp, lbmFREE);
1683 log->bp = NULL;
1684
1685 /*
1686 * synchronous update log superblock
1687 * mark log state as shutdown cleanly
1688 * (i.e., Log does not need to be replayed).
1689 */
1690 if ((rc = lbmRead(log, 1, &bpsuper)))
1691 goto out;
1692
1693 logsuper = (struct logsuper *) bpsuper->l_ldata;
1694 logsuper->state = cpu_to_le32(LOGREDONE);
1695 logsuper->end = cpu_to_le32(lsn);
1696 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1697 rc = lbmIOWait(bpsuper, lbmFREE);
1698
1699 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1700 lsn, log->page, log->eor);
1701
1702 out:
1703 /*
1704 * shutdown per log i/o
1705 */
1706 lbmLogShutdown(log);
1707
1708 if (rc) {
1709 jfs_warn("lmLogShutdown: exit(%d)", rc);
1710 }
1711 return rc;
1712 }
1713
1714
1715 /*
1716 * NAME: lmLogFileSystem()
1717 *
1718 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1719 * file system into/from log active file system list.
1720 *
1721 * PARAMETE: log - pointer to logs inode.
1722 * fsdev - kdev_t of filesystem.
1723 * serial - pointer to returned log serial number
1724 * activate - insert/remove device from active list.
1725 *
1726 * RETURN: 0 - success
1727 * errors returned by vms_iowait().
1728 */
lmLogFileSystem(struct jfs_log * log,struct jfs_sb_info * sbi,int activate)1729 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1730 int activate)
1731 {
1732 int rc = 0;
1733 int i;
1734 struct logsuper *logsuper;
1735 struct lbuf *bpsuper;
1736 char *uuid = sbi->uuid;
1737
1738 /*
1739 * insert/remove file system device to log active file system list.
1740 */
1741 if ((rc = lbmRead(log, 1, &bpsuper)))
1742 return rc;
1743
1744 logsuper = (struct logsuper *) bpsuper->l_ldata;
1745 if (activate) {
1746 for (i = 0; i < MAX_ACTIVE; i++)
1747 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
1748 memcpy(logsuper->active[i].uuid, uuid, 16);
1749 sbi->aggregate = i;
1750 break;
1751 }
1752 if (i == MAX_ACTIVE) {
1753 jfs_warn("Too many file systems sharing journal!");
1754 lbmFree(bpsuper);
1755 return -EMFILE; /* Is there a better rc? */
1756 }
1757 } else {
1758 for (i = 0; i < MAX_ACTIVE; i++)
1759 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
1760 memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
1761 break;
1762 }
1763 if (i == MAX_ACTIVE) {
1764 jfs_warn("Somebody stomped on the journal!");
1765 lbmFree(bpsuper);
1766 return -EIO;
1767 }
1768
1769 }
1770
1771 /*
1772 * synchronous write log superblock:
1773 *
1774 * write sidestream bypassing write queue:
1775 * at file system mount, log super block is updated for
1776 * activation of the file system before any log record
1777 * (MOUNT record) of the file system, and at file system
1778 * unmount, all meta data for the file system has been
1779 * flushed before log super block is updated for deactivation
1780 * of the file system.
1781 */
1782 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1783 rc = lbmIOWait(bpsuper, lbmFREE);
1784
1785 return rc;
1786 }
1787
1788 /*
1789 * log buffer manager (lbm)
1790 * ------------------------
1791 *
1792 * special purpose buffer manager supporting log i/o requirements.
1793 *
1794 * per log write queue:
1795 * log pageout occurs in serial order by fifo write queue and
1796 * restricting to a single i/o in pregress at any one time.
1797 * a circular singly-linked list
1798 * (log->wrqueue points to the tail, and buffers are linked via
1799 * bp->wrqueue field), and
1800 * maintains log page in pageout ot waiting for pageout in serial pageout.
1801 */
1802
1803 /*
1804 * lbmLogInit()
1805 *
1806 * initialize per log I/O setup at lmLogInit()
1807 */
lbmLogInit(struct jfs_log * log)1808 static int lbmLogInit(struct jfs_log * log)
1809 { /* log inode */
1810 int i;
1811 struct lbuf *lbuf;
1812
1813 jfs_info("lbmLogInit: log:0x%p", log);
1814
1815 /* initialize current buffer cursor */
1816 log->bp = NULL;
1817
1818 /* initialize log device write queue */
1819 log->wqueue = NULL;
1820
1821 /*
1822 * Each log has its own buffer pages allocated to it. These are
1823 * not managed by the page cache. This ensures that a transaction
1824 * writing to the log does not block trying to allocate a page from
1825 * the page cache (for the log). This would be bad, since page
1826 * allocation waits on the kswapd thread that may be committing inodes
1827 * which would cause log activity. Was that clear? I'm trying to
1828 * avoid deadlock here.
1829 */
1830 init_waitqueue_head(&log->free_wait);
1831
1832 log->lbuf_free = NULL;
1833
1834 for (i = 0; i < LOGPAGES;) {
1835 char *buffer;
1836 uint offset;
1837 struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1838
1839 if (!page)
1840 goto error;
1841 buffer = page_address(page);
1842 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
1843 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
1844 if (lbuf == NULL) {
1845 if (offset == 0)
1846 __free_page(page);
1847 goto error;
1848 }
1849 if (offset) /* we already have one reference */
1850 get_page(page);
1851 lbuf->l_offset = offset;
1852 lbuf->l_ldata = buffer + offset;
1853 lbuf->l_page = page;
1854 lbuf->l_log = log;
1855 init_waitqueue_head(&lbuf->l_ioevent);
1856
1857 lbuf->l_freelist = log->lbuf_free;
1858 log->lbuf_free = lbuf;
1859 i++;
1860 }
1861 }
1862
1863 return (0);
1864
1865 error:
1866 lbmLogShutdown(log);
1867 return -ENOMEM;
1868 }
1869
1870
1871 /*
1872 * lbmLogShutdown()
1873 *
1874 * finalize per log I/O setup at lmLogShutdown()
1875 */
lbmLogShutdown(struct jfs_log * log)1876 static void lbmLogShutdown(struct jfs_log * log)
1877 {
1878 struct lbuf *lbuf;
1879
1880 jfs_info("lbmLogShutdown: log:0x%p", log);
1881
1882 lbuf = log->lbuf_free;
1883 while (lbuf) {
1884 struct lbuf *next = lbuf->l_freelist;
1885 __free_page(lbuf->l_page);
1886 kfree(lbuf);
1887 lbuf = next;
1888 }
1889 }
1890
1891
1892 /*
1893 * lbmAllocate()
1894 *
1895 * allocate an empty log buffer
1896 */
lbmAllocate(struct jfs_log * log,int pn)1897 static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1898 {
1899 struct lbuf *bp;
1900 unsigned long flags;
1901
1902 /*
1903 * recycle from log buffer freelist if any
1904 */
1905 LCACHE_LOCK(flags);
1906 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags);
1907 log->lbuf_free = bp->l_freelist;
1908 LCACHE_UNLOCK(flags);
1909
1910 bp->l_flag = 0;
1911
1912 bp->l_wqnext = NULL;
1913 bp->l_freelist = NULL;
1914
1915 bp->l_pn = pn;
1916 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1917 bp->l_ceor = 0;
1918
1919 return bp;
1920 }
1921
1922
1923 /*
1924 * lbmFree()
1925 *
1926 * release a log buffer to freelist
1927 */
lbmFree(struct lbuf * bp)1928 static void lbmFree(struct lbuf * bp)
1929 {
1930 unsigned long flags;
1931
1932 LCACHE_LOCK(flags);
1933
1934 lbmfree(bp);
1935
1936 LCACHE_UNLOCK(flags);
1937 }
1938
lbmfree(struct lbuf * bp)1939 static void lbmfree(struct lbuf * bp)
1940 {
1941 struct jfs_log *log = bp->l_log;
1942
1943 assert(bp->l_wqnext == NULL);
1944
1945 /*
1946 * return the buffer to head of freelist
1947 */
1948 bp->l_freelist = log->lbuf_free;
1949 log->lbuf_free = bp;
1950
1951 wake_up(&log->free_wait);
1952 return;
1953 }
1954
1955
1956 /*
1957 * NAME: lbmRedrive
1958 *
1959 * FUNCTION: add a log buffer to the log redrive list
1960 *
1961 * PARAMETER:
1962 * bp - log buffer
1963 *
1964 * NOTES:
1965 * Takes log_redrive_lock.
1966 */
lbmRedrive(struct lbuf * bp)1967 static inline void lbmRedrive(struct lbuf *bp)
1968 {
1969 unsigned long flags;
1970
1971 spin_lock_irqsave(&log_redrive_lock, flags);
1972 bp->l_redrive_next = log_redrive_list;
1973 log_redrive_list = bp;
1974 spin_unlock_irqrestore(&log_redrive_lock, flags);
1975
1976 wake_up_process(jfsIOthread);
1977 }
1978
1979
1980 /*
1981 * lbmRead()
1982 */
lbmRead(struct jfs_log * log,int pn,struct lbuf ** bpp)1983 static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1984 {
1985 struct bio *bio;
1986 struct lbuf *bp;
1987
1988 /*
1989 * allocate a log buffer
1990 */
1991 *bpp = bp = lbmAllocate(log, pn);
1992 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
1993
1994 bp->l_flag |= lbmREAD;
1995
1996 bio = bio_alloc(GFP_NOFS, 1);
1997
1998 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
1999 bio_set_dev(bio, log->bdev);
2000
2001 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2002 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
2003
2004 bio->bi_end_io = lbmIODone;
2005 bio->bi_private = bp;
2006 bio->bi_opf = REQ_OP_READ;
2007 /*check if journaling to disk has been disabled*/
2008 if (log->no_integrity) {
2009 bio->bi_iter.bi_size = 0;
2010 lbmIODone(bio);
2011 } else {
2012 submit_bio(bio);
2013 }
2014
2015 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2016
2017 return 0;
2018 }
2019
2020
2021 /*
2022 * lbmWrite()
2023 *
2024 * buffer at head of pageout queue stays after completion of
2025 * partial-page pageout and redriven by explicit initiation of
2026 * pageout by caller until full-page pageout is completed and
2027 * released.
2028 *
2029 * device driver i/o done redrives pageout of new buffer at
2030 * head of pageout queue when current buffer at head of pageout
2031 * queue is released at the completion of its full-page pageout.
2032 *
2033 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2034 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2035 */
lbmWrite(struct jfs_log * log,struct lbuf * bp,int flag,int cant_block)2036 static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2037 int cant_block)
2038 {
2039 struct lbuf *tail;
2040 unsigned long flags;
2041
2042 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2043
2044 /* map the logical block address to physical block address */
2045 bp->l_blkno =
2046 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2047
2048 LCACHE_LOCK(flags); /* disable+lock */
2049
2050 /*
2051 * initialize buffer for device driver
2052 */
2053 bp->l_flag = flag;
2054
2055 /*
2056 * insert bp at tail of write queue associated with log
2057 *
2058 * (request is either for bp already/currently at head of queue
2059 * or new bp to be inserted at tail)
2060 */
2061 tail = log->wqueue;
2062
2063 /* is buffer not already on write queue ? */
2064 if (bp->l_wqnext == NULL) {
2065 /* insert at tail of wqueue */
2066 if (tail == NULL) {
2067 log->wqueue = bp;
2068 bp->l_wqnext = bp;
2069 } else {
2070 log->wqueue = bp;
2071 bp->l_wqnext = tail->l_wqnext;
2072 tail->l_wqnext = bp;
2073 }
2074
2075 tail = bp;
2076 }
2077
2078 /* is buffer at head of wqueue and for write ? */
2079 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) {
2080 LCACHE_UNLOCK(flags); /* unlock+enable */
2081 return;
2082 }
2083
2084 LCACHE_UNLOCK(flags); /* unlock+enable */
2085
2086 if (cant_block)
2087 lbmRedrive(bp);
2088 else if (flag & lbmSYNC)
2089 lbmStartIO(bp);
2090 else {
2091 LOGGC_UNLOCK(log);
2092 lbmStartIO(bp);
2093 LOGGC_LOCK(log);
2094 }
2095 }
2096
2097
2098 /*
2099 * lbmDirectWrite()
2100 *
2101 * initiate pageout bypassing write queue for sidestream
2102 * (e.g., log superblock) write;
2103 */
lbmDirectWrite(struct jfs_log * log,struct lbuf * bp,int flag)2104 static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2105 {
2106 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2107 bp, flag, bp->l_pn);
2108
2109 /*
2110 * initialize buffer for device driver
2111 */
2112 bp->l_flag = flag | lbmDIRECT;
2113
2114 /* map the logical block address to physical block address */
2115 bp->l_blkno =
2116 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2117
2118 /*
2119 * initiate pageout of the page
2120 */
2121 lbmStartIO(bp);
2122 }
2123
2124
2125 /*
2126 * NAME: lbmStartIO()
2127 *
2128 * FUNCTION: Interface to DD strategy routine
2129 *
2130 * RETURN: none
2131 *
2132 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2133 */
lbmStartIO(struct lbuf * bp)2134 static void lbmStartIO(struct lbuf * bp)
2135 {
2136 struct bio *bio;
2137 struct jfs_log *log = bp->l_log;
2138
2139 jfs_info("lbmStartIO");
2140
2141 bio = bio_alloc(GFP_NOFS, 1);
2142 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
2143 bio_set_dev(bio, log->bdev);
2144
2145 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2146 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
2147
2148 bio->bi_end_io = lbmIODone;
2149 bio->bi_private = bp;
2150 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC;
2151
2152 /* check if journaling to disk has been disabled */
2153 if (log->no_integrity) {
2154 bio->bi_iter.bi_size = 0;
2155 lbmIODone(bio);
2156 } else {
2157 submit_bio(bio);
2158 INCREMENT(lmStat.submitted);
2159 }
2160 }
2161
2162
2163 /*
2164 * lbmIOWait()
2165 */
lbmIOWait(struct lbuf * bp,int flag)2166 static int lbmIOWait(struct lbuf * bp, int flag)
2167 {
2168 unsigned long flags;
2169 int rc = 0;
2170
2171 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2172
2173 LCACHE_LOCK(flags); /* disable+lock */
2174
2175 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2176
2177 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2178
2179 if (flag & lbmFREE)
2180 lbmfree(bp);
2181
2182 LCACHE_UNLOCK(flags); /* unlock+enable */
2183
2184 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2185 return rc;
2186 }
2187
2188 /*
2189 * lbmIODone()
2190 *
2191 * executed at INTIODONE level
2192 */
lbmIODone(struct bio * bio)2193 static void lbmIODone(struct bio *bio)
2194 {
2195 struct lbuf *bp = bio->bi_private;
2196 struct lbuf *nextbp, *tail;
2197 struct jfs_log *log;
2198 unsigned long flags;
2199
2200 /*
2201 * get back jfs buffer bound to the i/o buffer
2202 */
2203 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2204
2205 LCACHE_LOCK(flags); /* disable+lock */
2206
2207 bp->l_flag |= lbmDONE;
2208
2209 if (bio->bi_status) {
2210 bp->l_flag |= lbmERROR;
2211
2212 jfs_err("lbmIODone: I/O error in JFS log");
2213 }
2214
2215 bio_put(bio);
2216
2217 /*
2218 * pagein completion
2219 */
2220 if (bp->l_flag & lbmREAD) {
2221 bp->l_flag &= ~lbmREAD;
2222
2223 LCACHE_UNLOCK(flags); /* unlock+enable */
2224
2225 /* wakeup I/O initiator */
2226 LCACHE_WAKEUP(&bp->l_ioevent);
2227
2228 return;
2229 }
2230
2231 /*
2232 * pageout completion
2233 *
2234 * the bp at the head of write queue has completed pageout.
2235 *
2236 * if single-commit/full-page pageout, remove the current buffer
2237 * from head of pageout queue, and redrive pageout with
2238 * the new buffer at head of pageout queue;
2239 * otherwise, the partial-page pageout buffer stays at
2240 * the head of pageout queue to be redriven for pageout
2241 * by lmGroupCommit() until full-page pageout is completed.
2242 */
2243 bp->l_flag &= ~lbmWRITE;
2244 INCREMENT(lmStat.pagedone);
2245
2246 /* update committed lsn */
2247 log = bp->l_log;
2248 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2249
2250 if (bp->l_flag & lbmDIRECT) {
2251 LCACHE_WAKEUP(&bp->l_ioevent);
2252 LCACHE_UNLOCK(flags);
2253 return;
2254 }
2255
2256 tail = log->wqueue;
2257
2258 /* single element queue */
2259 if (bp == tail) {
2260 /* remove head buffer of full-page pageout
2261 * from log device write queue
2262 */
2263 if (bp->l_flag & lbmRELEASE) {
2264 log->wqueue = NULL;
2265 bp->l_wqnext = NULL;
2266 }
2267 }
2268 /* multi element queue */
2269 else {
2270 /* remove head buffer of full-page pageout
2271 * from log device write queue
2272 */
2273 if (bp->l_flag & lbmRELEASE) {
2274 nextbp = tail->l_wqnext = bp->l_wqnext;
2275 bp->l_wqnext = NULL;
2276
2277 /*
2278 * redrive pageout of next page at head of write queue:
2279 * redrive next page without any bound tblk
2280 * (i.e., page w/o any COMMIT records), or
2281 * first page of new group commit which has been
2282 * queued after current page (subsequent pageout
2283 * is performed synchronously, except page without
2284 * any COMMITs) by lmGroupCommit() as indicated
2285 * by lbmWRITE flag;
2286 */
2287 if (nextbp->l_flag & lbmWRITE) {
2288 /*
2289 * We can't do the I/O at interrupt time.
2290 * The jfsIO thread can do it
2291 */
2292 lbmRedrive(nextbp);
2293 }
2294 }
2295 }
2296
2297 /*
2298 * synchronous pageout:
2299 *
2300 * buffer has not necessarily been removed from write queue
2301 * (e.g., synchronous write of partial-page with COMMIT):
2302 * leave buffer for i/o initiator to dispose
2303 */
2304 if (bp->l_flag & lbmSYNC) {
2305 LCACHE_UNLOCK(flags); /* unlock+enable */
2306
2307 /* wakeup I/O initiator */
2308 LCACHE_WAKEUP(&bp->l_ioevent);
2309 }
2310
2311 /*
2312 * Group Commit pageout:
2313 */
2314 else if (bp->l_flag & lbmGC) {
2315 LCACHE_UNLOCK(flags);
2316 lmPostGC(bp);
2317 }
2318
2319 /*
2320 * asynchronous pageout:
2321 *
2322 * buffer must have been removed from write queue:
2323 * insert buffer at head of freelist where it can be recycled
2324 */
2325 else {
2326 assert(bp->l_flag & lbmRELEASE);
2327 assert(bp->l_flag & lbmFREE);
2328 lbmfree(bp);
2329
2330 LCACHE_UNLOCK(flags); /* unlock+enable */
2331 }
2332 }
2333
jfsIOWait(void * arg)2334 int jfsIOWait(void *arg)
2335 {
2336 struct lbuf *bp;
2337
2338 do {
2339 spin_lock_irq(&log_redrive_lock);
2340 while ((bp = log_redrive_list)) {
2341 log_redrive_list = bp->l_redrive_next;
2342 bp->l_redrive_next = NULL;
2343 spin_unlock_irq(&log_redrive_lock);
2344 lbmStartIO(bp);
2345 spin_lock_irq(&log_redrive_lock);
2346 }
2347
2348 if (freezing(current)) {
2349 spin_unlock_irq(&log_redrive_lock);
2350 try_to_freeze();
2351 } else {
2352 set_current_state(TASK_INTERRUPTIBLE);
2353 spin_unlock_irq(&log_redrive_lock);
2354 schedule();
2355 }
2356 } while (!kthread_should_stop());
2357
2358 jfs_info("jfsIOWait being killed!");
2359 return 0;
2360 }
2361
2362 /*
2363 * NAME: lmLogFormat()/jfs_logform()
2364 *
2365 * FUNCTION: format file system log
2366 *
2367 * PARAMETERS:
2368 * log - volume log
2369 * logAddress - start address of log space in FS block
2370 * logSize - length of log space in FS block;
2371 *
2372 * RETURN: 0 - success
2373 * -EIO - i/o error
2374 *
2375 * XXX: We're synchronously writing one page at a time. This needs to
2376 * be improved by writing multiple pages at once.
2377 */
lmLogFormat(struct jfs_log * log,s64 logAddress,int logSize)2378 int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
2379 {
2380 int rc = -EIO;
2381 struct jfs_sb_info *sbi;
2382 struct logsuper *logsuper;
2383 struct logpage *lp;
2384 int lspn; /* log sequence page number */
2385 struct lrd *lrd_ptr;
2386 int npages = 0;
2387 struct lbuf *bp;
2388
2389 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2390 (long long)logAddress, logSize);
2391
2392 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2393
2394 /* allocate a log buffer */
2395 bp = lbmAllocate(log, 1);
2396
2397 npages = logSize >> sbi->l2nbperpage;
2398
2399 /*
2400 * log space:
2401 *
2402 * page 0 - reserved;
2403 * page 1 - log superblock;
2404 * page 2 - log data page: A SYNC log record is written
2405 * into this page at logform time;
2406 * pages 3-N - log data page: set to empty log data pages;
2407 */
2408 /*
2409 * init log superblock: log page 1
2410 */
2411 logsuper = (struct logsuper *) bp->l_ldata;
2412
2413 logsuper->magic = cpu_to_le32(LOGMAGIC);
2414 logsuper->version = cpu_to_le32(LOGVERSION);
2415 logsuper->state = cpu_to_le32(LOGREDONE);
2416 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */
2417 logsuper->size = cpu_to_le32(npages);
2418 logsuper->bsize = cpu_to_le32(sbi->bsize);
2419 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
2420 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
2421
2422 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2423 bp->l_blkno = logAddress + sbi->nbperpage;
2424 lbmStartIO(bp);
2425 if ((rc = lbmIOWait(bp, 0)))
2426 goto exit;
2427
2428 /*
2429 * init pages 2 to npages-1 as log data pages:
2430 *
2431 * log page sequence number (lpsn) initialization:
2432 *
2433 * pn: 0 1 2 3 n-1
2434 * +-----+-----+=====+=====+===.....===+=====+
2435 * lspn: N-1 0 1 N-2
2436 * <--- N page circular file ---->
2437 *
2438 * the N (= npages-2) data pages of the log is maintained as
2439 * a circular file for the log records;
2440 * lpsn grows by 1 monotonically as each log page is written
2441 * to the circular file of the log;
2442 * and setLogpage() will not reset the page number even if
2443 * the eor is equal to LOGPHDRSIZE. In order for binary search
2444 * still work in find log end process, we have to simulate the
2445 * log wrap situation at the log format time.
2446 * The 1st log page written will have the highest lpsn. Then
2447 * the succeeding log pages will have ascending order of
2448 * the lspn starting from 0, ... (N-2)
2449 */
2450 lp = (struct logpage *) bp->l_ldata;
2451 /*
2452 * initialize 1st log page to be written: lpsn = N - 1,
2453 * write a SYNCPT log record is written to this page
2454 */
2455 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2456 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
2457
2458 lrd_ptr = (struct lrd *) &lp->data;
2459 lrd_ptr->logtid = 0;
2460 lrd_ptr->backchain = 0;
2461 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT);
2462 lrd_ptr->length = 0;
2463 lrd_ptr->log.syncpt.sync = 0;
2464
2465 bp->l_blkno += sbi->nbperpage;
2466 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2467 lbmStartIO(bp);
2468 if ((rc = lbmIOWait(bp, 0)))
2469 goto exit;
2470
2471 /*
2472 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
2473 */
2474 for (lspn = 0; lspn < npages - 3; lspn++) {
2475 lp->h.page = lp->t.page = cpu_to_le32(lspn);
2476 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
2477
2478 bp->l_blkno += sbi->nbperpage;
2479 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2480 lbmStartIO(bp);
2481 if ((rc = lbmIOWait(bp, 0)))
2482 goto exit;
2483 }
2484
2485 rc = 0;
2486 exit:
2487 /*
2488 * finalize log
2489 */
2490 /* release the buffer */
2491 lbmFree(bp);
2492
2493 return rc;
2494 }
2495
2496 #ifdef CONFIG_JFS_STATISTICS
jfs_lmstats_proc_show(struct seq_file * m,void * v)2497 int jfs_lmstats_proc_show(struct seq_file *m, void *v)
2498 {
2499 seq_printf(m,
2500 "JFS Logmgr stats\n"
2501 "================\n"
2502 "commits = %d\n"
2503 "writes submitted = %d\n"
2504 "writes completed = %d\n"
2505 "full pages submitted = %d\n"
2506 "partial pages submitted = %d\n",
2507 lmStat.commit,
2508 lmStat.submitted,
2509 lmStat.pagedone,
2510 lmStat.full_page,
2511 lmStat.partial_page);
2512 return 0;
2513 }
2514 #endif /* CONFIG_JFS_STATISTICS */
2515