arm64: reduce el2_setup branching
[linux/fpc-iii.git] / fs / jfs / jfs_logmgr.c
blobbb1da1feafeb8202d904b4215f13dd1868dd2b4e
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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.
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.
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
21 * jfs_logmgr.c: log manager
23 * for related information, see transaction manager (jfs_txnmgr.c), and
24 * recovery manager (jfs_logredo.c).
26 * note: for detail, RTFS.
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
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.
41 * TBD lazy commit:
42 * transactions are committed asynchronously when the log page
43 * containing it COMMIT is paged out when it becomes full;
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;
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).
57 * alternatives:
58 * lsn - 64-bit monotonically increasing integer vs
59 * 32-bit lspn and page eor.
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"
84 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread)
86 static struct lbuf *log_redrive_list;
87 static DEFINE_SPINLOCK(log_redrive_lock);
91 * log read/write serialization (per log)
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))
99 * log group commit serialization (per log)
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)
108 * log sync serialization (per log)
110 #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE)
111 #define LOGSYNC_BARRIER(logsize) ((logsize)/4)
113 #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE)
114 #define LOGSYNC_BARRIER(logsize) ((logsize)/2)
119 * log buffer cache synchronization
121 static DEFINE_SPINLOCK(jfsLCacheLock);
123 #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags)
124 #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags)
127 * See __SLEEP_COND in jfs_locks.h
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)
136 #define LCACHE_WAKEUP(event) wake_up(event)
140 * lbuf buffer cache (lCache) control
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;
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;
152 #define lbmSYNC 0x0008 /* do not return to freelist
153 * when removed from write queue;
155 #define lbmFREE 0x0010 /* return to freelist
156 * at completion of pageout;
157 * the buffer may be recycled;
159 #define lbmDONE 0x0020
160 #define lbmERROR 0x0040
161 #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing
162 * of log page
164 #define lbmDIRECT 0x0100
167 * Global list of active external journals
169 static LIST_HEAD(jfs_external_logs);
170 static struct jfs_log *dummy_log;
171 static DEFINE_MUTEX(jfs_log_mutex);
174 * forward references
176 static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
177 struct lrd * lrd, struct tlock * tlck);
179 static int lmNextPage(struct jfs_log * log);
180 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
181 int activate);
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);
202 * statistics
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
214 static void write_special_inodes(struct jfs_log *log,
215 int (*writer)(struct address_space *))
217 struct jfs_sb_info *sbi;
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);
227 * NAME: lmLog()
229 * FUNCTION: write a log record;
231 * PARAMETER:
233 * RETURN: lsn - offset to the next log record to write (end-of-log);
234 * -1 - error;
236 * note: todo: log error handler
238 int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
239 struct tlock * tlck)
241 int lsn;
242 int diffp, difft;
243 struct metapage *mp = NULL;
244 unsigned long flags;
246 jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p",
247 log, tblk, lrd, tlck);
249 LOG_LOCK(log);
251 /* log by (out-of-transaction) JFS ? */
252 if (tblk == NULL)
253 goto writeRecord;
255 /* log from page ? */
256 if (tlck == NULL ||
257 tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL)
258 goto writeRecord;
261 * initialize/update page/transaction recovery lsn
263 lsn = log->lsn;
265 LOGSYNC_LOCK(log, flags);
268 * initialize page lsn if first log write of the page
270 if (mp->lsn == 0) {
271 mp->log = log;
272 mp->lsn = lsn;
273 log->count++;
275 /* insert page at tail of logsynclist */
276 list_add_tail(&mp->synclist, &log->synclist);
280 * initialize/update lsn of tblock of the page
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.
295 * initialize transaction lsn:
297 if (tblk->lsn == 0) {
298 /* inherit lsn of its first page logged */
299 tblk->lsn = mp->lsn;
300 log->count++;
302 /* insert tblock after the page on logsynclist */
303 list_add(&tblk->synclist, &mp->synclist);
306 * update transaction lsn:
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;
316 /* move tblock after page on logsynclist */
317 list_move(&tblk->synclist, &mp->synclist);
321 LOGSYNC_UNLOCK(log, flags);
324 * write the log record
326 writeRecord:
327 lsn = lmWriteRecord(log, tblk, lrd, tlck);
330 * forward log syncpt if log reached next syncpt trigger
332 logdiff(diffp, lsn, log);
333 if (diffp >= log->nextsync)
334 lsn = lmLogSync(log, 0);
336 /* update end-of-log lsn */
337 log->lsn = lsn;
339 LOG_UNLOCK(log);
341 /* return end-of-log address */
342 return lsn;
346 * NAME: lmWriteRecord()
348 * FUNCTION: move the log record to current log page
350 * PARAMETER: cd - commit descriptor
352 * RETURN: end-of-log address
354 * serialization: LOG_LOCK() held on entry/exit
356 static int
357 lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
358 struct tlock * tlck)
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;
377 len = 0;
379 /* retrieve destination log page to write */
380 bp = (struct lbuf *) log->bp;
381 lp = (struct logpage *) bp->l_ldata;
382 dstoffset = log->eor;
384 /* any log data to write ? */
385 if (tlck == NULL)
386 goto moveLrd;
389 * move log record data
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;
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;
404 #ifdef _JFS_WIP
405 else if (tlck->flag & tlckINLINELOCK) {
407 inlinelock = (struct inlinelock *) & tlck;
408 p = (caddr_t) & inlinelock->pxd;
409 linelock = (struct linelock *) & tlck;
411 #endif /* _JFS_WIP */
412 else {
413 jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck);
414 return 0; /* Probably should trap */
416 l2linesize = linelock->l2linesize;
418 moveData:
419 ASSERT(linelock->index <= linelock->maxcnt);
421 lv = linelock->lv;
422 for (i = 0; i < linelock->index; i++, lv++) {
423 if (lv->length == 0)
424 continue;
426 /* is page full ? */
427 if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) {
428 /* page become full: move on to next page */
429 lmNextPage(log);
431 bp = log->bp;
432 lp = (struct logpage *) bp->l_ldata;
433 dstoffset = LOGPHDRSIZE;
437 * move log vector data
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;
449 /* is page not full ? */
450 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
451 break;
453 /* page become full: move on to next page */
454 lmNextPage(log);
456 bp = (struct lbuf *) log->bp;
457 lp = (struct logpage *) bp->l_ldata;
458 dstoffset = LOGPHDRSIZE;
460 srclen -= nbytes;
461 src += nbytes;
465 * move log vector descriptor
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);
476 if ((i = linelock->next)) {
477 linelock = (struct linelock *) lid_to_tlock(i);
478 goto moveData;
482 * move log record descriptor
484 moveLrd:
485 lrd->length = cpu_to_le16(len);
487 src = (caddr_t) lrd;
488 srclen = LOGRDSIZE;
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);
496 dstoffset += nbytes;
497 srclen -= nbytes;
499 /* are there more to move than freespace of page ? */
500 if (srclen)
501 goto pageFull;
504 * end of log record descriptor
507 /* update last log record eor */
508 log->eor = dstoffset;
509 bp->l_eor = dstoffset;
510 lsn = (log->page << L2LOGPSIZE) + dstoffset;
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);
517 INCREMENT(lmStat.commit); /* # of commit */
520 * enqueue tblock for group commit:
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.)
527 LOGGC_LOCK(log);
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;
535 /* enqueue transaction to commit queue */
536 list_add_tail(&tblk->cqueue, &log->cqueue);
538 LOGGC_UNLOCK(log);
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);
544 /* page not full ? */
545 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
546 return lsn;
548 pageFull:
549 /* page become full: move on to next page */
550 lmNextPage(log);
552 bp = (struct lbuf *) log->bp;
553 lp = (struct logpage *) bp->l_ldata;
554 dstoffset = LOGPHDRSIZE;
555 src += nbytes;
558 return lsn;
563 * NAME: lmNextPage()
565 * FUNCTION: write current page and allocate next page.
567 * PARAMETER: log
569 * RETURN: 0
571 * serialization: LOG_LOCK() held on entry/exit
573 static int lmNextPage(struct jfs_log * log)
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;
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);
588 LOGGC_LOCK(log);
591 * write or queue the full page at the tail of write queue
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);
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);
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;
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
620 if (bp->l_wqnext == NULL)
621 lbmWrite(log, bp, 0, 0);
622 } else {
624 * No current GC leader, initiate group commit
626 log->cflag |= logGC_PAGEOUT;
627 lmGCwrite(log, 0);
630 /* page is not bound with outstanding tblk:
631 * init write or mark it to be redriven (lbmWRITE)
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);
639 LOGGC_UNLOCK(log);
642 * allocate/initialize next page
644 /* if log wraps, the first data page of log is 2
645 * (0 never used, 1 is superblock).
647 log->page = (pn == log->size - 1) ? 2 : pn + 1;
648 log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */
650 /* allocate/initialize next log page buffer */
651 nextbp = lbmAllocate(log, log->page);
652 nextbp->l_eor = log->eor;
653 log->bp = nextbp;
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);
660 return 0;
665 * NAME: lmGroupCommit()
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.
672 * RETURN:
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().
679 int lmGroupCommit(struct jfs_log * log, struct tblock * tblk)
681 int rc = 0;
683 LOGGC_LOCK(log);
685 /* group committed already ? */
686 if (tblk->flag & tblkGC_COMMITTED) {
687 if (tblk->flag & tblkGC_ERROR)
688 rc = -EIO;
690 LOGGC_UNLOCK(log);
691 return rc;
693 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc);
695 if (tblk->xflag & COMMIT_LAZY)
696 tblk->flag |= tblkGC_LAZY;
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)) {
702 * No pageout in progress
704 * start group commit as its group leader.
706 log->cflag |= logGC_PAGEOUT;
708 lmGCwrite(log, 0);
711 if (tblk->xflag & COMMIT_LAZY) {
713 * Lazy transactions can leave now
715 LOGGC_UNLOCK(log);
716 return 0;
719 /* lmGCwrite gives up LOGGC_LOCK, check again */
721 if (tblk->flag & tblkGC_COMMITTED) {
722 if (tblk->flag & tblkGC_ERROR)
723 rc = -EIO;
725 LOGGC_UNLOCK(log);
726 return rc;
729 /* upcount transaction waiting for completion
731 log->gcrtc++;
732 tblk->flag |= tblkGC_READY;
734 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED),
735 LOGGC_LOCK(log), LOGGC_UNLOCK(log));
737 /* removed from commit queue */
738 if (tblk->flag & tblkGC_ERROR)
739 rc = -EIO;
741 LOGGC_UNLOCK(log);
742 return rc;
746 * NAME: lmGCwrite()
748 * FUNCTION: group commit write
749 * initiate write of log page, building a group of all transactions
750 * with commit records on that page.
752 * RETURN: None
754 * NOTE:
755 * LOGGC_LOCK must be held by caller.
756 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
758 static void lmGCwrite(struct jfs_log * log, int cant_write)
760 struct lbuf *bp;
761 struct logpage *lp;
762 int gcpn; /* group commit page number */
763 struct tblock *tblk;
764 struct tblock *xtblk = NULL;
767 * build the commit group of a log page
769 * scan commit queue and make a commit group of all
770 * transactions with COMMIT records on the same log page.
772 /* get the head tblk on the commit queue */
773 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn;
775 list_for_each_entry(tblk, &log->cqueue, cqueue) {
776 if (tblk->pn != gcpn)
777 break;
779 xtblk = tblk;
781 /* state transition: (QUEUE, READY) -> COMMIT */
782 tblk->flag |= tblkGC_COMMIT;
784 tblk = xtblk; /* last tblk of the page */
787 * pageout to commit transactions on the log page.
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);
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);
812 * NAME: lmPostGC()
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.
818 * RETURN: None
820 * NOTE:
821 * This routine is called a interrupt time by lbmIODone
823 static void lmPostGC(struct lbuf * bp)
825 unsigned long flags;
826 struct jfs_log *log = bp->l_log;
827 struct logpage *lp;
828 struct tblock *tblk, *temp;
830 //LOGGC_LOCK(log);
831 spin_lock_irqsave(&log->gclock, flags);
833 * current pageout of group commit completed.
835 * remove/wakeup transactions from commit queue who were
836 * group committed with the current log page
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.
846 if (bp->l_flag & lbmERROR)
847 tblk->flag |= tblkGC_ERROR;
849 /* remove it from the commit queue */
850 list_del(&tblk->cqueue);
851 tblk->flag &= ~tblkGC_QUEUE;
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;
859 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk,
860 tblk->flag);
862 if (!(tblk->xflag & COMMIT_FORCE))
864 * Hand tblk over to lazy commit thread
866 txLazyUnlock(tblk);
867 else {
868 /* state transition: COMMIT -> COMMITTED */
869 tblk->flag |= tblkGC_COMMITTED;
871 if (tblk->flag & tblkGC_READY)
872 log->gcrtc--;
874 LOGGC_WAKEUP(tblk);
877 /* was page full before pageout ?
878 * (and this is the last tblk bound with the page)
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)
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,
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.
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))
908 * Call lmGCwrite with new group leader
910 lmGCwrite(log, 1);
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.
917 else
918 log->cflag &= ~logGC_PAGEOUT;
920 //LOGGC_UNLOCK(log);
921 spin_unlock_irqrestore(&log->gclock, flags);
922 return;
926 * NAME: lmLogSync()
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.
935 * PARAMETERS: log - log structure
936 * hard_sync - 1 to force all metadata to be written
938 * RETURN: 0
940 * serialization: LOG_LOCK() held on entry/exit
942 static int lmLogSync(struct jfs_log * log, int hard_sync)
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;
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);
961 * forward syncpt
963 /* if last sync is same as last syncpt,
964 * invoke sync point forward processing to update sync.
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;
976 LOGSYNC_UNLOCK(log, flags);
980 /* if sync is different from last syncpt,
981 * write a SYNCPT record with syncpt = sync.
982 * reset syncpt = sync
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);
992 log->syncpt = log->sync;
993 } else
994 lsn = log->lsn;
997 * setup next syncpt trigger (SWAG)
999 logsize = log->logsize;
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");
1008 * log wrapping
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
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().
1022 /* mark log state log wrap in log superblock */
1023 /* log->state = LOGWRAP; */
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;
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.
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);
1043 * We may have to initiate group commit
1045 jfs_flush_journal(log, 0);
1048 return lsn;
1052 * NAME: jfs_syncpt
1054 * FUNCTION: write log SYNCPT record for specified log
1056 * PARAMETERS: log - log structure
1057 * hard_sync - set to 1 to force metadata to be written
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);
1067 * NAME: lmLogOpen()
1069 * FUNCTION: open the log on first open;
1070 * insert filesystem in the active list of the log.
1072 * PARAMETER: ipmnt - file system mount inode
1073 * iplog - log inode (out)
1075 * RETURN:
1077 * serialization:
1079 int lmLogOpen(struct super_block *sb)
1081 int rc;
1082 struct block_device *bdev;
1083 struct jfs_log *log;
1084 struct jfs_sb_info *sbi = JFS_SBI(sb);
1086 if (sbi->flag & JFS_NOINTEGRITY)
1087 return open_dummy_log(sb);
1089 if (sbi->mntflag & JFS_INLINELOG)
1090 return open_inline_log(sb);
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;
1102 * add file system to log active file system list
1104 if ((rc = lmLogFileSystem(log, sbi, 1))) {
1105 mutex_unlock(&jfs_log_mutex);
1106 return rc;
1108 goto journal_found;
1112 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
1113 mutex_unlock(&jfs_log_mutex);
1114 return -ENOMEM;
1116 INIT_LIST_HEAD(&log->sb_list);
1117 init_waitqueue_head(&log->syncwait);
1120 * external log as separate logical volume
1122 * file systems to log may have n-to-1 relationship;
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;
1132 log->bdev = bdev;
1133 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
1136 * initialize log:
1138 if ((rc = lmLogInit(log)))
1139 goto close;
1141 list_add(&log->journal_list, &jfs_external_logs);
1144 * add file system to log active file system list
1146 if ((rc = lmLogFileSystem(log, sbi, 1)))
1147 goto shutdown;
1149 journal_found:
1150 LOG_LOCK(log);
1151 list_add(&sbi->log_list, &log->sb_list);
1152 sbi->log = log;
1153 LOG_UNLOCK(log);
1155 mutex_unlock(&jfs_log_mutex);
1156 return 0;
1159 * unwind on error
1161 shutdown: /* unwind lbmLogInit() */
1162 list_del(&log->journal_list);
1163 lbmLogShutdown(log);
1165 close: /* close external log device */
1166 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1168 free: /* free log descriptor */
1169 mutex_unlock(&jfs_log_mutex);
1170 kfree(log);
1172 jfs_warn("lmLogOpen: exit(%d)", rc);
1173 return rc;
1176 static int open_inline_log(struct super_block *sb)
1178 struct jfs_log *log;
1179 int rc;
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);
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);
1195 * initialize log.
1197 if ((rc = lmLogInit(log))) {
1198 kfree(log);
1199 jfs_warn("lmLogOpen: exit(%d)", rc);
1200 return rc;
1203 list_add(&JFS_SBI(sb)->log_list, &log->sb_list);
1204 JFS_SBI(sb)->log = log;
1206 return rc;
1209 static int open_dummy_log(struct super_block *sb)
1211 int rc;
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;
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;
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);
1241 return 0;
1245 * NAME: lmLogInit()
1247 * FUNCTION: log initialization at first log open.
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.
1254 * PARAMETER: log - log structure
1256 * RETURN: 0 - if ok
1257 * -EINVAL - bad log magic number or superblock dirty
1258 * error returned from logwait()
1260 * serialization: single first open thread
1262 int lmLogInit(struct jfs_log * log)
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;
1272 jfs_info("lmLogInit: log:0x%p", log);
1274 /* initialize the group commit serialization lock */
1275 LOGGC_LOCK_INIT(log);
1277 /* allocate/initialize the log write serialization lock */
1278 LOG_LOCK_INIT(log);
1280 LOGSYNC_LOCK_INIT(log);
1282 INIT_LIST_HEAD(&log->synclist);
1284 INIT_LIST_HEAD(&log->cqueue);
1285 log->flush_tblk = NULL;
1287 log->count = 0;
1290 * initialize log i/o
1292 if ((rc = lbmLogInit(log)))
1293 return rc;
1295 if (!test_bit(log_INLINELOG, &log->flag))
1296 log->l2bsize = L2LOGPSIZE;
1298 /* check for disabled journaling to disk */
1299 if (log->no_integrity) {
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.
1305 bp = lbmAllocate(log , 0);
1306 log->bp = bp;
1307 bp->l_pn = bp->l_eor = 0;
1308 } else {
1310 * validate log superblock
1312 if ((rc = lbmRead(log, 1, &bpsuper)))
1313 goto errout10;
1315 logsuper = (struct logsuper *) bpsuper->l_ldata;
1317 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) {
1318 jfs_warn("*** Log Format Error ! ***");
1319 rc = -EINVAL;
1320 goto errout20;
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;
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;
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 goto errout20;
1343 log->size = le32_to_cpu(logsuper->size);
1344 log->l2bsize = le32_to_cpu(logsuper->l2bsize);
1345 jfs_info("lmLogInit: external log:0x%p base:0x%Lx size:0x%x",
1346 log, (unsigned long long)log->base, log->size);
1349 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
1350 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
1353 * initialize for log append write mode
1355 /* establish current/end-of-log page/buffer */
1356 if ((rc = lbmRead(log, log->page, &bp)))
1357 goto errout20;
1359 lp = (struct logpage *) bp->l_ldata;
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));
1365 log->bp = bp;
1366 bp->l_pn = log->page;
1367 bp->l_eor = log->eor;
1369 /* if current page is full, move on to next page */
1370 if (log->eor >= LOGPSIZE - LOGPTLRSIZE)
1371 lmNextPage(log);
1374 * initialize log syncpoint
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;
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;
1398 * update/write superblock
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;
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);
1415 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x",
1416 log->lsn, log->syncpt, log->sync);
1419 * initialize for lazy/group commit
1421 log->clsn = lsn;
1423 return 0;
1426 * unwind on error
1428 errout30: /* release log page */
1429 log->wqueue = NULL;
1430 bp->l_wqnext = NULL;
1431 lbmFree(bp);
1433 errout20: /* release log superblock */
1434 lbmFree(bpsuper);
1436 errout10: /* unwind lbmLogInit() */
1437 lbmLogShutdown(log);
1439 jfs_warn("lmLogInit: exit(%d)", rc);
1440 return rc;
1445 * NAME: lmLogClose()
1447 * FUNCTION: remove file system <ipmnt> from active list of log <iplog>
1448 * and close it on last close.
1450 * PARAMETER: sb - superblock
1452 * RETURN: errors from subroutines
1454 * serialization:
1456 int lmLogClose(struct super_block *sb)
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;
1463 jfs_info("lmLogClose: log:0x%p", log);
1465 mutex_lock(&jfs_log_mutex);
1466 LOG_LOCK(log);
1467 list_del(&sbi->log_list);
1468 LOG_UNLOCK(log);
1469 sbi->log = NULL;
1472 * We need to make sure all of the "written" metapages
1473 * actually make it to disk
1475 sync_blockdev(sb->s_bdev);
1477 if (test_bit(log_INLINELOG, &log->flag)) {
1479 * in-line log in host file system
1481 rc = lmLogShutdown(log);
1482 kfree(log);
1483 goto out;
1486 if (!log->no_integrity)
1487 lmLogFileSystem(log, sbi, 0);
1489 if (!list_empty(&log->sb_list))
1490 goto out;
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.
1499 if (log->no_integrity)
1500 goto out;
1503 * external log as separate logical volume
1505 list_del(&log->journal_list);
1506 bdev = log->bdev;
1507 rc = lmLogShutdown(log);
1509 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1511 kfree(log);
1513 out:
1514 mutex_unlock(&jfs_log_mutex);
1515 jfs_info("lmLogClose: exit(%d)", rc);
1516 return rc;
1521 * NAME: jfs_flush_journal()
1523 * FUNCTION: initiate write of any outstanding transactions to the journal
1524 * and optionally wait until they are all written to disk
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
1530 void jfs_flush_journal(struct jfs_log *log, int wait)
1532 int i;
1533 struct tblock *target = NULL;
1535 /* jfs_write_inode may call us during read-only mount */
1536 if (!log)
1537 return;
1539 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait);
1541 LOGGC_LOCK(log);
1543 if (!list_empty(&log->cqueue)) {
1545 * This ensures that we will keep writing to the journal as long
1546 * as there are unwritten commit records
1548 target = list_entry(log->cqueue.prev, struct tblock, cqueue);
1550 if (test_bit(log_FLUSH, &log->flag)) {
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
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);
1565 * Initiate I/O on outstanding transactions
1567 if (!(log->cflag & logGC_PAGEOUT)) {
1568 log->cflag |= logGC_PAGEOUT;
1569 lmGCwrite(log, 0);
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;
1579 if (wait && target && !(target->flag & tblkGC_COMMITTED)) {
1580 DECLARE_WAITQUEUE(__wait, current);
1582 add_wait_queue(&target->gcwait, &__wait);
1583 set_current_state(TASK_UNINTERRUPTIBLE);
1584 LOGGC_UNLOCK(log);
1585 schedule();
1586 LOGGC_LOCK(log);
1587 remove_wait_queue(&target->gcwait, &__wait);
1589 LOGGC_UNLOCK(log);
1591 if (wait < 2)
1592 return;
1594 write_special_inodes(log, filemap_fdatawrite);
1597 * If there was recent activity, we may need to wait
1598 * for the lazycommit thread to catch up
1600 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
1601 for (i = 0; i < 200; i++) { /* Too much? */
1602 msleep(250);
1603 write_special_inodes(log, filemap_fdatawrite);
1604 if (list_empty(&log->cqueue) &&
1605 list_empty(&log->synclist))
1606 break;
1609 assert(list_empty(&log->cqueue));
1611 #ifdef CONFIG_JFS_DEBUG
1612 if (!list_empty(&log->synclist)) {
1613 struct logsyncblk *lp;
1615 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n");
1616 list_for_each_entry(lp, &log->synclist, synclist) {
1617 if (lp->xflag & COMMIT_PAGE) {
1618 struct metapage *mp = (struct metapage *)lp;
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);
1632 #else
1633 WARN_ON(!list_empty(&log->synclist));
1634 #endif
1635 clear_bit(log_FLUSH, &log->flag);
1639 * NAME: lmLogShutdown()
1641 * FUNCTION: log shutdown at last LogClose().
1643 * write log syncpt record.
1644 * update super block to set redone flag to 0.
1646 * PARAMETER: log - log inode
1648 * RETURN: 0 - success
1650 * serialization: single last close thread
1652 int lmLogShutdown(struct jfs_log * log)
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;
1662 jfs_info("lmLogShutdown: log:0x%p", log);
1664 jfs_flush_journal(log, 2);
1667 * write the last SYNCPT record with syncpoint = 0
1668 * (i.e., log redo up to HERE !)
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;
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);
1682 log->bp = NULL;
1685 * synchronous update log superblock
1686 * mark log state as shutdown cleanly
1687 * (i.e., Log does not need to be replayed).
1689 if ((rc = lbmRead(log, 1, &bpsuper)))
1690 goto out;
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);
1698 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1699 lsn, log->page, log->eor);
1701 out:
1703 * shutdown per log i/o
1705 lbmLogShutdown(log);
1707 if (rc) {
1708 jfs_warn("lmLogShutdown: exit(%d)", rc);
1710 return rc;
1715 * NAME: lmLogFileSystem()
1717 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1718 * file system into/from log active file system list.
1720 * PARAMETE: log - pointer to logs inode.
1721 * fsdev - kdev_t of filesystem.
1722 * serial - pointer to returned log serial number
1723 * activate - insert/remove device from active list.
1725 * RETURN: 0 - success
1726 * errors returned by vms_iowait().
1728 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1729 int activate)
1731 int rc = 0;
1732 int i;
1733 struct logsuper *logsuper;
1734 struct lbuf *bpsuper;
1735 char *uuid = sbi->uuid;
1738 * insert/remove file system device to log active file system list.
1740 if ((rc = lbmRead(log, 1, &bpsuper)))
1741 return rc;
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;
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? */
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;
1762 if (i == MAX_ACTIVE) {
1763 jfs_warn("Somebody stomped on the journal!");
1764 lbmFree(bpsuper);
1765 return -EIO;
1771 * synchronous write log superblock:
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.
1781 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1782 rc = lbmIOWait(bpsuper, lbmFREE);
1784 return rc;
1788 * log buffer manager (lbm)
1789 * ------------------------
1791 * special purpose buffer manager supporting log i/o requirements.
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.
1803 * lbmLogInit()
1805 * initialize per log I/O setup at lmLogInit()
1807 static int lbmLogInit(struct jfs_log * log)
1808 { /* log inode */
1809 int i;
1810 struct lbuf *lbuf;
1812 jfs_info("lbmLogInit: log:0x%p", log);
1814 /* initialize current buffer cursor */
1815 log->bp = NULL;
1817 /* initialize log device write queue */
1818 log->wqueue = NULL;
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.
1829 init_waitqueue_head(&log->free_wait);
1831 log->lbuf_free = NULL;
1833 for (i = 0; i < LOGPAGES;) {
1834 char *buffer;
1835 uint offset;
1836 struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1838 if (!page)
1839 goto error;
1840 buffer = page_address(page);
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)
1845 __free_page(page);
1846 goto error;
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);
1856 lbuf->l_freelist = log->lbuf_free;
1857 log->lbuf_free = lbuf;
1858 i++;
1862 return (0);
1864 error:
1865 lbmLogShutdown(log);
1866 return -ENOMEM;
1871 * lbmLogShutdown()
1873 * finalize per log I/O setup at lmLogShutdown()
1875 static void lbmLogShutdown(struct jfs_log * log)
1877 struct lbuf *lbuf;
1879 jfs_info("lbmLogShutdown: log:0x%p", log);
1881 lbuf = log->lbuf_free;
1882 while (lbuf) {
1883 struct lbuf *next = lbuf->l_freelist;
1884 __free_page(lbuf->l_page);
1885 kfree(lbuf);
1886 lbuf = next;
1892 * lbmAllocate()
1894 * allocate an empty log buffer
1896 static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1898 struct lbuf *bp;
1899 unsigned long flags;
1902 * recycle from log buffer freelist if any
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);
1909 bp->l_flag = 0;
1911 bp->l_wqnext = NULL;
1912 bp->l_freelist = NULL;
1914 bp->l_pn = pn;
1915 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1916 bp->l_ceor = 0;
1918 return bp;
1923 * lbmFree()
1925 * release a log buffer to freelist
1927 static void lbmFree(struct lbuf * bp)
1929 unsigned long flags;
1931 LCACHE_LOCK(flags);
1933 lbmfree(bp);
1935 LCACHE_UNLOCK(flags);
1938 static void lbmfree(struct lbuf * bp)
1940 struct jfs_log *log = bp->l_log;
1942 assert(bp->l_wqnext == NULL);
1945 * return the buffer to head of freelist
1947 bp->l_freelist = log->lbuf_free;
1948 log->lbuf_free = bp;
1950 wake_up(&log->free_wait);
1951 return;
1956 * NAME: lbmRedrive
1958 * FUNCTION: add a log buffer to the log redrive list
1960 * PARAMETER:
1961 * bp - log buffer
1963 * NOTES:
1964 * Takes log_redrive_lock.
1966 static inline void lbmRedrive(struct lbuf *bp)
1968 unsigned long flags;
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);
1975 wake_up_process(jfsIOthread);
1980 * lbmRead()
1982 static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1984 struct bio *bio;
1985 struct lbuf *bp;
1988 * allocate a log buffer
1990 *bpp = bp = lbmAllocate(log, pn);
1991 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
1993 bp->l_flag |= lbmREAD;
1995 bio = bio_alloc(GFP_NOFS, 1);
1997 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
1998 bio->bi_bdev = log->bdev;
2000 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2001 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
2003 bio->bi_end_io = lbmIODone;
2004 bio->bi_private = bp;
2005 bio->bi_opf = REQ_OP_READ;
2006 /*check if journaling to disk has been disabled*/
2007 if (log->no_integrity) {
2008 bio->bi_iter.bi_size = 0;
2009 lbmIODone(bio);
2010 } else {
2011 submit_bio(bio);
2014 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2016 return 0;
2021 * lbmWrite()
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.
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.
2032 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2033 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2035 static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2036 int cant_block)
2038 struct lbuf *tail;
2039 unsigned long flags;
2041 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2043 /* map the logical block address to physical block address */
2044 bp->l_blkno =
2045 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2047 LCACHE_LOCK(flags); /* disable+lock */
2050 * initialize buffer for device driver
2052 bp->l_flag = flag;
2055 * insert bp at tail of write queue associated with log
2057 * (request is either for bp already/currently at head of queue
2058 * or new bp to be inserted at tail)
2060 tail = log->wqueue;
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;
2074 tail = bp;
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;
2083 LCACHE_UNLOCK(flags); /* unlock+enable */
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);
2098 * lbmDirectWrite()
2100 * initiate pageout bypassing write queue for sidestream
2101 * (e.g., log superblock) write;
2103 static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2105 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2106 bp, flag, bp->l_pn);
2109 * initialize buffer for device driver
2111 bp->l_flag = flag | lbmDIRECT;
2113 /* map the logical block address to physical block address */
2114 bp->l_blkno =
2115 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2118 * initiate pageout of the page
2120 lbmStartIO(bp);
2125 * NAME: lbmStartIO()
2127 * FUNCTION: Interface to DD strategy routine
2129 * RETURN: none
2131 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2133 static void lbmStartIO(struct lbuf * bp)
2135 struct bio *bio;
2136 struct jfs_log *log = bp->l_log;
2138 jfs_info("lbmStartIO");
2140 bio = bio_alloc(GFP_NOFS, 1);
2141 bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9);
2142 bio->bi_bdev = log->bdev;
2144 bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset);
2145 BUG_ON(bio->bi_iter.bi_size != LOGPSIZE);
2147 bio->bi_end_io = lbmIODone;
2148 bio->bi_private = bp;
2149 bio->bi_opf = REQ_OP_WRITE | REQ_SYNC;
2151 /* check if journaling to disk has been disabled */
2152 if (log->no_integrity) {
2153 bio->bi_iter.bi_size = 0;
2154 lbmIODone(bio);
2155 } else {
2156 submit_bio(bio);
2157 INCREMENT(lmStat.submitted);
2163 * lbmIOWait()
2165 static int lbmIOWait(struct lbuf * bp, int flag)
2167 unsigned long flags;
2168 int rc = 0;
2170 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2172 LCACHE_LOCK(flags); /* disable+lock */
2174 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2176 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2178 if (flag & lbmFREE)
2179 lbmfree(bp);
2181 LCACHE_UNLOCK(flags); /* unlock+enable */
2183 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2184 return rc;
2188 * lbmIODone()
2190 * executed at INTIODONE level
2192 static void lbmIODone(struct bio *bio)
2194 struct lbuf *bp = bio->bi_private;
2195 struct lbuf *nextbp, *tail;
2196 struct jfs_log *log;
2197 unsigned long flags;
2200 * get back jfs buffer bound to the i/o buffer
2202 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2204 LCACHE_LOCK(flags); /* disable+lock */
2206 bp->l_flag |= lbmDONE;
2208 if (bio->bi_error) {
2209 bp->l_flag |= lbmERROR;
2211 jfs_err("lbmIODone: I/O error in JFS log");
2214 bio_put(bio);
2217 * pagein completion
2219 if (bp->l_flag & lbmREAD) {
2220 bp->l_flag &= ~lbmREAD;
2222 LCACHE_UNLOCK(flags); /* unlock+enable */
2224 /* wakeup I/O initiator */
2225 LCACHE_WAKEUP(&bp->l_ioevent);
2227 return;
2231 * pageout completion
2233 * the bp at the head of write queue has completed pageout.
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.
2242 bp->l_flag &= ~lbmWRITE;
2243 INCREMENT(lmStat.pagedone);
2245 /* update committed lsn */
2246 log = bp->l_log;
2247 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2249 if (bp->l_flag & lbmDIRECT) {
2250 LCACHE_WAKEUP(&bp->l_ioevent);
2251 LCACHE_UNLOCK(flags);
2252 return;
2255 tail = log->wqueue;
2257 /* single element queue */
2258 if (bp == tail) {
2259 /* remove head buffer of full-page pageout
2260 * from log device write queue
2262 if (bp->l_flag & lbmRELEASE) {
2263 log->wqueue = NULL;
2264 bp->l_wqnext = NULL;
2267 /* multi element queue */
2268 else {
2269 /* remove head buffer of full-page pageout
2270 * from log device write queue
2272 if (bp->l_flag & lbmRELEASE) {
2273 nextbp = tail->l_wqnext = bp->l_wqnext;
2274 bp->l_wqnext = NULL;
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;
2286 if (nextbp->l_flag & lbmWRITE) {
2288 * We can't do the I/O at interrupt time.
2289 * The jfsIO thread can do it
2291 lbmRedrive(nextbp);
2297 * synchronous pageout:
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
2303 if (bp->l_flag & lbmSYNC) {
2304 LCACHE_UNLOCK(flags); /* unlock+enable */
2306 /* wakeup I/O initiator */
2307 LCACHE_WAKEUP(&bp->l_ioevent);
2311 * Group Commit pageout:
2313 else if (bp->l_flag & lbmGC) {
2314 LCACHE_UNLOCK(flags);
2315 lmPostGC(bp);
2319 * asynchronous pageout:
2321 * buffer must have been removed from write queue:
2322 * insert buffer at head of freelist where it can be recycled
2324 else {
2325 assert(bp->l_flag & lbmRELEASE);
2326 assert(bp->l_flag & lbmFREE);
2327 lbmfree(bp);
2329 LCACHE_UNLOCK(flags); /* unlock+enable */
2333 int jfsIOWait(void *arg)
2335 struct lbuf *bp;
2337 do {
2338 spin_lock_irq(&log_redrive_lock);
2339 while ((bp = log_redrive_list)) {
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);
2347 if (freezing(current)) {
2348 spin_unlock_irq(&log_redrive_lock);
2349 try_to_freeze();
2350 } else {
2351 set_current_state(TASK_INTERRUPTIBLE);
2352 spin_unlock_irq(&log_redrive_lock);
2353 schedule();
2355 } while (!kthread_should_stop());
2357 jfs_info("jfsIOWait being killed!");
2358 return 0;
2362 * NAME: lmLogFormat()/jfs_logform()
2364 * FUNCTION: format file system log
2366 * PARAMETERS:
2367 * log - volume log
2368 * logAddress - start address of log space in FS block
2369 * logSize - length of log space in FS block;
2371 * RETURN: 0 - success
2372 * -EIO - i/o error
2374 * XXX: We're synchronously writing one page at a time. This needs to
2375 * be improved by writing multiple pages at once.
2377 int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
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;
2388 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2389 (long long)logAddress, logSize);
2391 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2393 /* allocate a log buffer */
2394 bp = lbmAllocate(log, 1);
2396 npages = logSize >> sbi->l2nbperpage;
2399 * log space:
2401 * page 0 - reserved;
2402 * page 1 - log superblock;
2403 * page 2 - log data page: A SYNC log record is written
2404 * into this page at logform time;
2405 * pages 3-N - log data page: set to empty log data pages;
2408 * init log superblock: log page 1
2410 logsuper = (struct logsuper *) bp->l_ldata;
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);
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;
2428 * init pages 2 to npages-1 as log data pages:
2430 * log page sequence number (lpsn) initialization:
2432 * pn: 0 1 2 3 n-1
2433 * +-----+-----+=====+=====+===.....===+=====+
2434 * lspn: N-1 0 1 N-2
2435 * <--- N page circular file ---->
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)
2449 lp = (struct logpage *) bp->l_ldata;
2451 * initialize 1st log page to be written: lpsn = N - 1,
2452 * write a SYNCPT log record is written to this page
2454 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2455 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
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;
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;
2471 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
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);
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;
2484 rc = 0;
2485 exit:
2487 * finalize log
2489 /* release the buffer */
2490 lbmFree(bp);
2492 return rc;
2495 #ifdef CONFIG_JFS_STATISTICS
2496 static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
2498 seq_printf(m,
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);
2511 return 0;
2514 static int jfs_lmstats_proc_open(struct inode *inode, struct file *file)
2516 return single_open(file, jfs_lmstats_proc_show, NULL);
2519 const struct file_operations jfs_lmstats_proc_fops = {
2520 .open = jfs_lmstats_proc_open,
2521 .read = seq_read,
2522 .llseek = seq_lseek,
2523 .release = single_release,
2525 #endif /* CONFIG_JFS_STATISTICS */