blob: cc5f811ed383ce9ad239e659e0056c59a81a5f73 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <linux/completion.h>
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -060066#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/buffer_head.h> /* for sync_blockdev() */
68#include <linux/bio.h>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080069#include <linux/freezer.h>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040070#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/delay.h>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080072#include <linux/mutex.h>
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -050073#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090074#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include "jfs_incore.h"
76#include "jfs_filsys.h"
77#include "jfs_metapage.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050078#include "jfs_superblock.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#include "jfs_txnmgr.h"
80#include "jfs_debug.h"
81
82
83/*
84 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread)
85 */
86static struct lbuf *log_redrive_list;
87static DEFINE_SPINLOCK(log_redrive_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89
90/*
91 * log read/write serialization (per log)
92 */
Ingo Molnar1de87442006-01-24 15:22:50 -060093#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))
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97
98/*
99 * log group commit serialization (per log)
100 */
101
102#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock)
103#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock)
104#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock)
105#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait)
106
107/*
108 * log sync serialization (per log)
109 */
110#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE)
111#define LOGSYNC_BARRIER(logsize) ((logsize)/4)
112/*
113#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE)
114#define LOGSYNC_BARRIER(logsize) ((logsize)/2)
115*/
116
117
118/*
119 * log buffer cache synchronization
120 */
121static DEFINE_SPINLOCK(jfsLCacheLock);
122
123#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags)
124#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags)
125
126/*
127 * See __SLEEP_COND in jfs_locks.h
128 */
129#define LCACHE_SLEEP_COND(wq, cond, flags) \
130do { \
131 if (cond) \
132 break; \
133 __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \
134} while (0)
135
136#define LCACHE_WAKEUP(event) wake_up(event)
137
138
139/*
140 * lbuf buffer cache (lCache) control
141 */
142/* log buffer manager pageout control (cumulative, inclusive) */
143#define lbmREAD 0x0001
144#define lbmWRITE 0x0002 /* enqueue at tail of write queue;
145 * init pageout if at head of queue;
146 */
147#define lbmRELEASE 0x0004 /* remove from write queue
148 * at completion of pageout;
149 * do not free/recycle it yet:
150 * caller will free it;
151 */
152#define lbmSYNC 0x0008 /* do not return to freelist
153 * when removed from write queue;
154 */
155#define lbmFREE 0x0010 /* return to freelist
156 * at completion of pageout;
157 * the buffer may be recycled;
158 */
159#define lbmDONE 0x0020
160#define lbmERROR 0x0040
161#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing
162 * of log page
163 */
164#define lbmDIRECT 0x0100
165
166/*
167 * Global list of active external journals
168 */
169static LIST_HEAD(jfs_external_logs);
170static struct jfs_log *dummy_log = NULL;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800171static DEFINE_MUTEX(jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 * forward references
175 */
176static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
177 struct lrd * lrd, struct tlock * tlck);
178
179static int lmNextPage(struct jfs_log * log);
180static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
181 int activate);
182
183static int open_inline_log(struct super_block *sb);
184static int open_dummy_log(struct super_block *sb);
185static int lbmLogInit(struct jfs_log * log);
186static void lbmLogShutdown(struct jfs_log * log);
187static struct lbuf *lbmAllocate(struct jfs_log * log, int);
188static void lbmFree(struct lbuf * bp);
189static void lbmfree(struct lbuf * bp);
190static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);
191static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block);
192static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag);
193static int lbmIOWait(struct lbuf * bp, int flag);
194static bio_end_io_t lbmIODone;
195static void lbmStartIO(struct lbuf * bp);
196static void lmGCwrite(struct jfs_log * log, int cant_block);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500197static int lmLogSync(struct jfs_log * log, int hard_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199
200
201/*
202 * statistics
203 */
204#ifdef CONFIG_JFS_STATISTICS
205static struct lmStat {
206 uint commit; /* # of commit */
207 uint pagedone; /* # of page written */
208 uint submitted; /* # of pages submitted */
209 uint full_page; /* # of full pages submitted */
210 uint partial_page; /* # of partial pages submitted */
211} lmStat;
212#endif
213
Dave Kleikamp67e66822007-10-10 11:11:24 -0500214static 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226/*
227 * NAME: lmLog()
228 *
229 * FUNCTION: write a log record;
230 *
231 * PARAMETER:
232 *
233 * RETURN: lsn - offset to the next log record to write (end-of-log);
234 * -1 - error;
235 *
236 * note: todo: log error handler
237 */
238int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
239 struct tlock * tlck)
240{
241 int lsn;
242 int diffp, difft;
243 struct metapage *mp = NULL;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600244 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500261 * initialize/update page/transaction recovery lsn
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 */
263 lsn = log->lsn;
264
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600265 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500280 * initialize/update lsn of tblock of the page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 *
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
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600321 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500324 * write the log record
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 */
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500353 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 * serialization: LOG_LOCK() held on entry/exit
355 */
356static int
357lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
358 struct tlock * tlck)
359{
360 int lsn = 0; /* end-of-log address */
361 struct lbuf *bp; /* dst log page buffer */
362 struct logpage *lp; /* dst log page */
363 caddr_t dst; /* destination address in log page */
364 int dstoffset; /* end-of-log offset in log page */
365 int freespace; /* free space in log page */
366 caddr_t p; /* src meta-data page */
367 caddr_t src;
368 int srclen;
369 int nbytes; /* number of bytes to move */
370 int i;
371 int len;
372 struct linelock *linelock;
373 struct lv *lv;
374 struct lvd *lvd;
375 int l2linesize;
376
377 len = 0;
378
379 /* retrieve destination log page to write */
380 bp = (struct lbuf *) log->bp;
381 lp = (struct logpage *) bp->l_ldata;
382 dstoffset = log->eor;
383
384 /* any log data to write ? */
385 if (tlck == NULL)
386 goto moveLrd;
387
388 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500389 * move log record data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 */
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500482 * move log record descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 */
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500570 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 * serialization: LOG_LOCK() held on entry/exit
572 */
573static int lmNextPage(struct jfs_log * log)
574{
575 struct logpage *lp;
576 int lspn; /* log sequence page number */
577 int pn; /* current page number */
578 struct lbuf *bp;
579 struct lbuf *nextbp;
580 struct tblock *tblk;
581
582 /* get current log page number and log sequence page number */
583 pn = log->page;
584 bp = log->bp;
585 lp = (struct logpage *) bp->l_ldata;
586 lspn = le32_to_cpu(lp->h.page);
587
588 LOGGC_LOCK(log);
589
590 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500591 * write or queue the full page at the tail of write queue
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 */
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500642 * allocate/initialize next page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 */
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 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500672 * RETURN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 *
674 * NOTE:
675 * LOGGC_LOCK serializes log group commit queue, and
676 * transaction blocks on the commit queue.
677 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
678 */
679int lmGroupCommit(struct jfs_log * log, struct tblock * tblk)
680{
681 int rc = 0;
682
683 LOGGC_LOCK(log);
684
685 /* group committed already ? */
686 if (tblk->flag & tblkGC_COMMITTED) {
687 if (tblk->flag & tblkGC_ERROR)
688 rc = -EIO;
689
690 LOGGC_UNLOCK(log);
691 return rc;
692 }
693 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc);
694
695 if (tblk->xflag & COMMIT_LAZY)
696 tblk->flag |= tblkGC_LAZY;
697
698 if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) &&
699 (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag)
700 || jfs_tlocks_low)) {
701 /*
702 * No pageout in progress
703 *
704 * start group commit as its group leader.
705 */
706 log->cflag |= logGC_PAGEOUT;
707
708 lmGCwrite(log, 0);
709 }
710
711 if (tblk->xflag & COMMIT_LAZY) {
712 /*
713 * Lazy transactions can leave now
714 */
715 LOGGC_UNLOCK(log);
716 return 0;
717 }
718
719 /* lmGCwrite gives up LOGGC_LOCK, check again */
720
721 if (tblk->flag & tblkGC_COMMITTED) {
722 if (tblk->flag & tblkGC_ERROR)
723 rc = -EIO;
724
725 LOGGC_UNLOCK(log);
726 return rc;
727 }
728
729 /* upcount transaction waiting for completion
730 */
731 log->gcrtc++;
732 tblk->flag |= tblkGC_READY;
733
734 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED),
735 LOGGC_LOCK(log), LOGGC_UNLOCK(log));
736
737 /* removed from commit queue */
738 if (tblk->flag & tblkGC_ERROR)
739 rc = -EIO;
740
741 LOGGC_UNLOCK(log);
742 return rc;
743}
744
745/*
746 * NAME: lmGCwrite()
747 *
748 * FUNCTION: group commit write
749 * initiate write of log page, building a group of all transactions
750 * with commit records on that page.
751 *
752 * RETURN: None
753 *
754 * NOTE:
755 * LOGGC_LOCK must be held by caller.
756 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
757 */
758static void lmGCwrite(struct jfs_log * log, int cant_write)
759{
760 struct lbuf *bp;
761 struct logpage *lp;
762 int gcpn; /* group commit page number */
763 struct tblock *tblk;
764 struct tblock *xtblk = NULL;
765
766 /*
767 * build the commit group of a log page
768 *
769 * scan commit queue and make a commit group of all
770 * transactions with COMMIT records on the same log page.
771 */
772 /* get the head tblk on the commit queue */
773 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn;
774
775 list_for_each_entry(tblk, &log->cqueue, cqueue) {
776 if (tblk->pn != gcpn)
777 break;
778
779 xtblk = tblk;
780
781 /* state transition: (QUEUE, READY) -> COMMIT */
782 tblk->flag |= tblkGC_COMMIT;
783 }
784 tblk = xtblk; /* last tblk of the page */
785
786 /*
787 * pageout to commit transactions on the log page.
788 */
789 bp = (struct lbuf *) tblk->bp;
790 lp = (struct logpage *) bp->l_ldata;
791 /* is page already full ? */
792 if (tblk->flag & tblkGC_EOP) {
793 /* mark page to free at end of group commit of the page */
794 tblk->flag &= ~tblkGC_EOP;
795 tblk->flag |= tblkGC_FREE;
796 bp->l_ceor = bp->l_eor;
797 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
798 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC,
799 cant_write);
800 INCREMENT(lmStat.full_page);
801 }
802 /* page is not yet full */
803 else {
804 bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */
805 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
806 lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write);
807 INCREMENT(lmStat.partial_page);
808 }
809}
810
811/*
812 * NAME: lmPostGC()
813 *
814 * FUNCTION: group commit post-processing
815 * Processes transactions after their commit records have been written
816 * to disk, redriving log I/O if necessary.
817 *
818 * RETURN: None
819 *
820 * NOTE:
821 * This routine is called a interrupt time by lbmIODone
822 */
823static void lmPostGC(struct lbuf * bp)
824{
825 unsigned long flags;
826 struct jfs_log *log = bp->l_log;
827 struct logpage *lp;
828 struct tblock *tblk, *temp;
829
830 //LOGGC_LOCK(log);
831 spin_lock_irqsave(&log->gclock, flags);
832 /*
833 * current pageout of group commit completed.
834 *
835 * remove/wakeup transactions from commit queue who were
836 * group committed with the current log page
837 */
838 list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) {
839 if (!(tblk->flag & tblkGC_COMMIT))
840 break;
841 /* if transaction was marked GC_COMMIT then
842 * it has been shipped in the current pageout
843 * and made it to disk - it is committed.
844 */
845
846 if (bp->l_flag & lbmERROR)
847 tblk->flag |= tblkGC_ERROR;
848
849 /* remove it from the commit queue */
850 list_del(&tblk->cqueue);
851 tblk->flag &= ~tblkGC_QUEUE;
852
853 if (tblk == log->flush_tblk) {
854 /* we can stop flushing the log now */
855 clear_bit(log_FLUSH, &log->flag);
856 log->flush_tblk = NULL;
857 }
858
859 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk,
860 tblk->flag);
861
862 if (!(tblk->xflag & COMMIT_FORCE))
863 /*
864 * Hand tblk over to lazy commit thread
865 */
866 txLazyUnlock(tblk);
867 else {
868 /* state transition: COMMIT -> COMMITTED */
869 tblk->flag |= tblkGC_COMMITTED;
870
871 if (tblk->flag & tblkGC_READY)
872 log->gcrtc--;
873
874 LOGGC_WAKEUP(tblk);
875 }
876
877 /* was page full before pageout ?
878 * (and this is the last tblk bound with the page)
879 */
880 if (tblk->flag & tblkGC_FREE)
881 lbmFree(bp);
882 /* did page become full after pageout ?
883 * (and this is the last tblk bound with the page)
884 */
885 else if (tblk->flag & tblkGC_EOP) {
886 /* finalize the page */
887 lp = (struct logpage *) bp->l_ldata;
888 bp->l_ceor = bp->l_eor;
889 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
890 jfs_info("lmPostGC: calling lbmWrite");
891 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE,
892 1);
893 }
894
895 }
896
897 /* are there any transactions who have entered lnGroupCommit()
898 * (whose COMMITs are after that of the last log page written.
899 * They are waiting for new group commit (above at (SLEEP 1))
900 * or lazy transactions are on a full (queued) log page,
901 * select the latest ready transaction as new group leader and
902 * wake her up to lead her group.
903 */
904 if ((!list_empty(&log->cqueue)) &&
905 ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) ||
906 test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low))
907 /*
908 * Call lmGCwrite with new group leader
909 */
910 lmGCwrite(log, 1);
911
912 /* no transaction are ready yet (transactions are only just
913 * queued (GC_QUEUE) and not entered for group commit yet).
914 * the first transaction entering group commit
915 * will elect herself as new group leader.
916 */
917 else
918 log->cflag &= ~logGC_PAGEOUT;
919
920 //LOGGC_UNLOCK(log);
921 spin_unlock_irqrestore(&log->gclock, flags);
922 return;
923}
924
925/*
926 * NAME: lmLogSync()
927 *
928 * FUNCTION: write log SYNCPT record for specified log
929 * if new sync address is available
930 * (normally the case if sync() is executed by back-ground
931 * process).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 * calculate new value of i_nextsync which determines when
933 * this code is called again.
934 *
Dave Kleikamp1c627822005-05-02 12:25:08 -0600935 * PARAMETERS: log - log structure
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500936 * hard_sync - 1 to force all metadata to be written
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 *
938 * RETURN: 0
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500939 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 * serialization: LOG_LOCK() held on entry/exit
941 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500942static int lmLogSync(struct jfs_log * log, int hard_sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
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;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600952 unsigned long flags;
953
954 /* push dirty metapages out to disk */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500955 if (hard_sync)
Dave Kleikamp67e66822007-10-10 11:11:24 -0500956 write_special_inodes(log, filemap_fdatawrite);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500957 else
Dave Kleikamp67e66822007-10-10 11:11:24 -0500958 write_special_inodes(log, filemap_flush);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500961 * forward syncpt
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 */
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) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600968 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 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 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600976 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
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) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500997 * setup next syncpt trigger (SWAG)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 */
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001008 * log wrapping
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 *
1010 * option 1 - panic ? No.!
1011 * option 2 - shutdown file systems
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001012 * associated with log ?
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 * option 3 - extend log ?
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 * option 4 - second chance
1015 *
1016 * mark log wrapped, and continue.
1017 * when all active transactions are completed,
Nikanth Karthikesan817f2c82010-09-20 11:44:00 +05301018 * mark log valid for recovery.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 * if crashed during invalid state, log state
Nikanth Karthikesan817f2c82010-09-20 11:44:00 +05301020 * implies invalid log, forcing fsck().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 */
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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 /* 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 */
Dave Kleikampc2783f32005-07-25 08:58:54 -05001037 if (!test_bit(log_SYNCBARRIER, &log->flag) &&
1038 (written > LOGSYNC_BARRIER(logsize)) && log->active) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 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
Dave Kleikamp1c627822005-05-02 12:25:08 -06001051/*
1052 * NAME: jfs_syncpt
1053 *
1054 * FUNCTION: write log SYNCPT record for specified log
1055 *
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001056 * PARAMETERS: log - log structure
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001057 * hard_sync - set to 1 to force metadata to be written
Dave Kleikamp1c627822005-05-02 12:25:08 -06001058 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001059void jfs_syncpt(struct jfs_log *log, int hard_sync)
Dave Kleikamp1c627822005-05-02 12:25:08 -06001060{ LOG_LOCK(log);
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001061 lmLogSync(log, hard_sync);
Dave Kleikamp1c627822005-05-02 12:25:08 -06001062 LOG_UNLOCK(log);
1063}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
1065/*
1066 * NAME: lmLogOpen()
1067 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001068 * FUNCTION: open the log on first open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 * insert filesystem in the active list of the log.
1070 *
1071 * PARAMETER: ipmnt - file system mount inode
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001072 * iplog - log inode (out)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 *
1074 * RETURN:
1075 *
1076 * serialization:
1077 */
1078int lmLogOpen(struct super_block *sb)
1079{
1080 int rc;
1081 struct block_device *bdev;
1082 struct jfs_log *log;
1083 struct jfs_sb_info *sbi = JFS_SBI(sb);
1084
1085 if (sbi->flag & JFS_NOINTEGRITY)
1086 return open_dummy_log(sb);
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001087
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 if (sbi->mntflag & JFS_INLINELOG)
1089 return open_inline_log(sb);
1090
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001091 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 list_for_each_entry(log, &jfs_external_logs, journal_list) {
1093 if (log->bdev->bd_dev == sbi->logdev) {
1094 if (memcmp(log->uuid, sbi->loguuid,
1095 sizeof(log->uuid))) {
1096 jfs_warn("wrong uuid on JFS journal\n");
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001097 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 return -EINVAL;
1099 }
1100 /*
1101 * add file system to log active file system list
1102 */
1103 if ((rc = lmLogFileSystem(log, sbi, 1))) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001104 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 return rc;
1106 }
1107 goto journal_found;
1108 }
1109 }
1110
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001111 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001112 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 return -ENOMEM;
1114 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 INIT_LIST_HEAD(&log->sb_list);
1116 init_waitqueue_head(&log->syncwait);
1117
1118 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001119 * external log as separate logical volume
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 *
1121 * file systems to log may have n-to-1 relationship;
1122 */
1123
Tejun Heod4d77622010-11-13 11:55:18 +01001124 bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
1125 log);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 if (IS_ERR(bdev)) {
Al Viro90547602011-06-05 19:22:56 +01001127 rc = PTR_ERR(bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 goto free;
1129 }
1130
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 log->bdev = bdev;
1132 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001133
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 /*
1135 * initialize log:
1136 */
1137 if ((rc = lmLogInit(log)))
Tejun Heoe525fd82010-11-13 11:55:17 +01001138 goto close;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
1140 list_add(&log->journal_list, &jfs_external_logs);
1141
1142 /*
1143 * add file system to log active file system list
1144 */
1145 if ((rc = lmLogFileSystem(log, sbi, 1)))
1146 goto shutdown;
1147
1148journal_found:
1149 LOG_LOCK(log);
1150 list_add(&sbi->log_list, &log->sb_list);
1151 sbi->log = log;
1152 LOG_UNLOCK(log);
1153
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001154 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return 0;
1156
1157 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001158 * unwind on error
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 */
1160 shutdown: /* unwind lbmLogInit() */
1161 list_del(&log->journal_list);
1162 lbmLogShutdown(log);
1163
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 close: /* close external log device */
Tejun Heoe525fd82010-11-13 11:55:17 +01001165 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 free: /* free log descriptor */
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001168 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 kfree(log);
1170
1171 jfs_warn("lmLogOpen: exit(%d)", rc);
1172 return rc;
1173}
1174
1175static int open_inline_log(struct super_block *sb)
1176{
1177 struct jfs_log *log;
1178 int rc;
1179
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001180 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 INIT_LIST_HEAD(&log->sb_list);
1183 init_waitqueue_head(&log->syncwait);
1184
1185 set_bit(log_INLINELOG, &log->flag);
1186 log->bdev = sb->s_bdev;
1187 log->base = addressPXD(&JFS_SBI(sb)->logpxd);
1188 log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >>
1189 (L2LOGPSIZE - sb->s_blocksize_bits);
1190 log->l2bsize = sb->s_blocksize_bits;
1191 ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits);
1192
1193 /*
1194 * initialize log.
1195 */
1196 if ((rc = lmLogInit(log))) {
1197 kfree(log);
1198 jfs_warn("lmLogOpen: exit(%d)", rc);
1199 return rc;
1200 }
1201
1202 list_add(&JFS_SBI(sb)->log_list, &log->sb_list);
1203 JFS_SBI(sb)->log = log;
1204
1205 return rc;
1206}
1207
1208static int open_dummy_log(struct super_block *sb)
1209{
1210 int rc;
1211
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001212 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (!dummy_log) {
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001214 dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 if (!dummy_log) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001216 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 return -ENOMEM;
1218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 INIT_LIST_HEAD(&dummy_log->sb_list);
1220 init_waitqueue_head(&dummy_log->syncwait);
1221 dummy_log->no_integrity = 1;
1222 /* Make up some stuff */
1223 dummy_log->base = 0;
1224 dummy_log->size = 1024;
1225 rc = lmLogInit(dummy_log);
1226 if (rc) {
1227 kfree(dummy_log);
1228 dummy_log = NULL;
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001229 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 return rc;
1231 }
1232 }
1233
1234 LOG_LOCK(dummy_log);
1235 list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list);
1236 JFS_SBI(sb)->log = dummy_log;
1237 LOG_UNLOCK(dummy_log);
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001238 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
1240 return 0;
1241}
1242
1243/*
1244 * NAME: lmLogInit()
1245 *
1246 * FUNCTION: log initialization at first log open.
1247 *
1248 * logredo() (or logformat()) should have been run previously.
1249 * initialize the log from log superblock.
1250 * set the log state in the superblock to LOGMOUNT and
1251 * write SYNCPT log record.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001252 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 * PARAMETER: log - log structure
1254 *
1255 * RETURN: 0 - if ok
1256 * -EINVAL - bad log magic number or superblock dirty
1257 * error returned from logwait()
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001258 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 * serialization: single first open thread
1260 */
1261int lmLogInit(struct jfs_log * log)
1262{
1263 int rc = 0;
1264 struct lrd lrd;
1265 struct logsuper *logsuper;
1266 struct lbuf *bpsuper;
1267 struct lbuf *bp;
1268 struct logpage *lp;
1269 int lsn = 0;
1270
1271 jfs_info("lmLogInit: log:0x%p", log);
1272
1273 /* initialize the group commit serialization lock */
1274 LOGGC_LOCK_INIT(log);
1275
1276 /* allocate/initialize the log write serialization lock */
1277 LOG_LOCK_INIT(log);
1278
1279 LOGSYNC_LOCK_INIT(log);
1280
1281 INIT_LIST_HEAD(&log->synclist);
1282
1283 INIT_LIST_HEAD(&log->cqueue);
1284 log->flush_tblk = NULL;
1285
1286 log->count = 0;
1287
1288 /*
1289 * initialize log i/o
1290 */
1291 if ((rc = lbmLogInit(log)))
1292 return rc;
1293
1294 if (!test_bit(log_INLINELOG, &log->flag))
1295 log->l2bsize = L2LOGPSIZE;
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001296
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 /* check for disabled journaling to disk */
1298 if (log->no_integrity) {
1299 /*
1300 * Journal pages will still be filled. When the time comes
1301 * to actually do the I/O, the write is not done, and the
1302 * endio routine is called directly.
1303 */
1304 bp = lbmAllocate(log , 0);
1305 log->bp = bp;
1306 bp->l_pn = bp->l_eor = 0;
1307 } else {
1308 /*
1309 * validate log superblock
1310 */
1311 if ((rc = lbmRead(log, 1, &bpsuper)))
1312 goto errout10;
1313
1314 logsuper = (struct logsuper *) bpsuper->l_ldata;
1315
1316 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) {
1317 jfs_warn("*** Log Format Error ! ***");
1318 rc = -EINVAL;
1319 goto errout20;
1320 }
1321
1322 /* logredo() should have been run successfully. */
1323 if (logsuper->state != cpu_to_le32(LOGREDONE)) {
1324 jfs_warn("*** Log Is Dirty ! ***");
1325 rc = -EINVAL;
1326 goto errout20;
1327 }
1328
1329 /* initialize log from log superblock */
1330 if (test_bit(log_INLINELOG,&log->flag)) {
1331 if (log->size != le32_to_cpu(logsuper->size)) {
1332 rc = -EINVAL;
1333 goto errout20;
1334 }
1335 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx "
1336 "size:0x%x", log,
1337 (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;
1342 }
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 "
1346 "size:0x%x", log,
1347 (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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001427 * unwind on error
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 */
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 */
1457int 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
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001466 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001480 * in-line log in host file system
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 */
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 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001504 * external log as separate logical volume
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 */
1506 list_del(&log->journal_list);
1507 bdev = log->bdev;
1508 rc = lmLogShutdown(log);
1509
Tejun Heoe525fd82010-11-13 11:55:17 +01001510 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512 kfree(log);
1513
1514 out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001515 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 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 */
1531void 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();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05001587 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 LOGGC_LOCK(log);
1589 remove_wait_queue(&target->gcwait, &__wait);
1590 }
1591 LOGGC_UNLOCK(log);
1592
1593 if (wait < 2)
1594 return;
1595
Dave Kleikamp67e66822007-10-10 11:11:24 -05001596 write_special_inodes(log, filemap_fdatawrite);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001597
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 /*
1599 * If there was recent activity, we may need to wait
1600 * for the lazycommit thread to catch up
1601 */
1602 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001603 for (i = 0; i < 200; i++) { /* Too much? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 msleep(250);
Dave Kleikamp67e66822007-10-10 11:11:24 -05001605 write_special_inodes(log, filemap_fdatawrite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 if (list_empty(&log->cqueue) &&
1607 list_empty(&log->synclist))
1608 break;
1609 }
1610 }
1611 assert(list_empty(&log->cqueue));
Dave Kleikamp72e31482005-06-03 14:09:54 -05001612
1613#ifdef CONFIG_JFS_DEBUG
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001614 if (!list_empty(&log->synclist)) {
1615 struct logsyncblk *lp;
1616
Dave Kleikamp209e1012007-06-06 16:30:17 -05001617 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n");
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001618 list_for_each_entry(lp, &log->synclist, synclist) {
1619 if (lp->xflag & COMMIT_PAGE) {
1620 struct metapage *mp = (struct metapage *)lp;
Dave Kleikamp288e4d82007-06-13 10:17:50 -05001621 print_hex_dump(KERN_ERR, "metapage: ",
1622 DUMP_PREFIX_ADDRESS, 16, 4,
1623 mp, sizeof(struct metapage), 0);
1624 print_hex_dump(KERN_ERR, "page: ",
1625 DUMP_PREFIX_ADDRESS, 16,
1626 sizeof(long), mp->page,
1627 sizeof(struct page), 0);
1628 } else
1629 print_hex_dump(KERN_ERR, "tblock:",
1630 DUMP_PREFIX_ADDRESS, 16, 4,
1631 lp, sizeof(struct tblock), 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001632 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001633 }
Dave Kleikamp288e4d82007-06-13 10:17:50 -05001634#else
1635 WARN_ON(!list_empty(&log->synclist));
Dave Kleikamp72e31482005-06-03 14:09:54 -05001636#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 clear_bit(log_FLUSH, &log->flag);
1638}
1639
1640/*
1641 * NAME: lmLogShutdown()
1642 *
1643 * FUNCTION: log shutdown at last LogClose().
1644 *
1645 * write log syncpt record.
1646 * update super block to set redone flag to 0.
1647 *
1648 * PARAMETER: log - log inode
1649 *
1650 * RETURN: 0 - success
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001651 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 * serialization: single last close thread
1653 */
1654int lmLogShutdown(struct jfs_log * log)
1655{
1656 int rc;
1657 struct lrd lrd;
1658 int lsn;
1659 struct logsuper *logsuper;
1660 struct lbuf *bpsuper;
1661 struct lbuf *bp;
1662 struct logpage *lp;
1663
1664 jfs_info("lmLogShutdown: log:0x%p", log);
1665
1666 jfs_flush_journal(log, 2);
1667
1668 /*
1669 * write the last SYNCPT record with syncpoint = 0
1670 * (i.e., log redo up to HERE !)
1671 */
1672 lrd.logtid = 0;
1673 lrd.backchain = 0;
1674 lrd.type = cpu_to_le16(LOG_SYNCPT);
1675 lrd.length = 0;
1676 lrd.log.syncpt.sync = 0;
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001677
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1679 bp = log->bp;
1680 lp = (struct logpage *) bp->l_ldata;
1681 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1682 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
1683 lbmIOWait(log->bp, lbmFREE);
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001684 log->bp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685
1686 /*
1687 * synchronous update log superblock
1688 * mark log state as shutdown cleanly
1689 * (i.e., Log does not need to be replayed).
1690 */
1691 if ((rc = lbmRead(log, 1, &bpsuper)))
1692 goto out;
1693
1694 logsuper = (struct logsuper *) bpsuper->l_ldata;
1695 logsuper->state = cpu_to_le32(LOGREDONE);
1696 logsuper->end = cpu_to_le32(lsn);
1697 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1698 rc = lbmIOWait(bpsuper, lbmFREE);
1699
1700 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1701 lsn, log->page, log->eor);
1702
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001703 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 /*
1705 * shutdown per log i/o
1706 */
1707 lbmLogShutdown(log);
1708
1709 if (rc) {
1710 jfs_warn("lmLogShutdown: exit(%d)", rc);
1711 }
1712 return rc;
1713}
1714
1715
1716/*
1717 * NAME: lmLogFileSystem()
1718 *
1719 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1720 * file system into/from log active file system list.
1721 *
1722 * PARAMETE: log - pointer to logs inode.
1723 * fsdev - kdev_t of filesystem.
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001724 * serial - pointer to returned log serial number
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 * activate - insert/remove device from active list.
1726 *
1727 * RETURN: 0 - success
1728 * errors returned by vms_iowait().
1729 */
1730static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1731 int activate)
1732{
1733 int rc = 0;
1734 int i;
1735 struct logsuper *logsuper;
1736 struct lbuf *bpsuper;
1737 char *uuid = sbi->uuid;
1738
1739 /*
1740 * insert/remove file system device to log active file system list.
1741 */
1742 if ((rc = lbmRead(log, 1, &bpsuper)))
1743 return rc;
1744
1745 logsuper = (struct logsuper *) bpsuper->l_ldata;
1746 if (activate) {
1747 for (i = 0; i < MAX_ACTIVE; i++)
1748 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
1749 memcpy(logsuper->active[i].uuid, uuid, 16);
1750 sbi->aggregate = i;
1751 break;
1752 }
1753 if (i == MAX_ACTIVE) {
1754 jfs_warn("Too many file systems sharing journal!");
1755 lbmFree(bpsuper);
1756 return -EMFILE; /* Is there a better rc? */
1757 }
1758 } else {
1759 for (i = 0; i < MAX_ACTIVE; i++)
1760 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
1761 memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
1762 break;
1763 }
1764 if (i == MAX_ACTIVE) {
1765 jfs_warn("Somebody stomped on the journal!");
1766 lbmFree(bpsuper);
1767 return -EIO;
1768 }
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001769
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 }
1771
1772 /*
1773 * synchronous write log superblock:
1774 *
1775 * write sidestream bypassing write queue:
1776 * at file system mount, log super block is updated for
1777 * activation of the file system before any log record
1778 * (MOUNT record) of the file system, and at file system
1779 * unmount, all meta data for the file system has been
1780 * flushed before log super block is updated for deactivation
1781 * of the file system.
1782 */
1783 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1784 rc = lbmIOWait(bpsuper, lbmFREE);
1785
1786 return rc;
1787}
1788
1789/*
1790 * log buffer manager (lbm)
1791 * ------------------------
1792 *
1793 * special purpose buffer manager supporting log i/o requirements.
1794 *
1795 * per log write queue:
1796 * log pageout occurs in serial order by fifo write queue and
1797 * restricting to a single i/o in pregress at any one time.
1798 * a circular singly-linked list
1799 * (log->wrqueue points to the tail, and buffers are linked via
1800 * bp->wrqueue field), and
1801 * maintains log page in pageout ot waiting for pageout in serial pageout.
1802 */
1803
1804/*
1805 * lbmLogInit()
1806 *
1807 * initialize per log I/O setup at lmLogInit()
1808 */
1809static int lbmLogInit(struct jfs_log * log)
1810{ /* log inode */
1811 int i;
1812 struct lbuf *lbuf;
1813
1814 jfs_info("lbmLogInit: log:0x%p", log);
1815
1816 /* initialize current buffer cursor */
1817 log->bp = NULL;
1818
1819 /* initialize log device write queue */
1820 log->wqueue = NULL;
1821
1822 /*
1823 * Each log has its own buffer pages allocated to it. These are
1824 * not managed by the page cache. This ensures that a transaction
1825 * writing to the log does not block trying to allocate a page from
1826 * the page cache (for the log). This would be bad, since page
1827 * allocation waits on the kswapd thread that may be committing inodes
1828 * which would cause log activity. Was that clear? I'm trying to
1829 * avoid deadlock here.
1830 */
1831 init_waitqueue_head(&log->free_wait);
1832
1833 log->lbuf_free = NULL;
1834
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001835 for (i = 0; i < LOGPAGES;) {
1836 char *buffer;
1837 uint offset;
1838 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001840 buffer = (char *) get_zeroed_page(GFP_KERNEL);
1841 if (buffer == NULL)
1842 goto error;
1843 page = virt_to_page(buffer);
1844 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
1845 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
1846 if (lbuf == NULL) {
1847 if (offset == 0)
1848 free_page((unsigned long) buffer);
1849 goto error;
1850 }
1851 if (offset) /* we already have one reference */
1852 get_page(page);
1853 lbuf->l_offset = offset;
1854 lbuf->l_ldata = buffer + offset;
1855 lbuf->l_page = page;
1856 lbuf->l_log = log;
1857 init_waitqueue_head(&lbuf->l_ioevent);
1858
1859 lbuf->l_freelist = log->lbuf_free;
1860 log->lbuf_free = lbuf;
1861 i++;
1862 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 }
1864
1865 return (0);
1866
1867 error:
1868 lbmLogShutdown(log);
1869 return -ENOMEM;
1870}
1871
1872
1873/*
1874 * lbmLogShutdown()
1875 *
1876 * finalize per log I/O setup at lmLogShutdown()
1877 */
1878static void lbmLogShutdown(struct jfs_log * log)
1879{
1880 struct lbuf *lbuf;
1881
1882 jfs_info("lbmLogShutdown: log:0x%p", log);
1883
1884 lbuf = log->lbuf_free;
1885 while (lbuf) {
1886 struct lbuf *next = lbuf->l_freelist;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001887 __free_page(lbuf->l_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 kfree(lbuf);
1889 lbuf = next;
1890 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891}
1892
1893
1894/*
1895 * lbmAllocate()
1896 *
1897 * allocate an empty log buffer
1898 */
1899static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1900{
1901 struct lbuf *bp;
1902 unsigned long flags;
1903
1904 /*
1905 * recycle from log buffer freelist if any
1906 */
1907 LCACHE_LOCK(flags);
1908 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags);
1909 log->lbuf_free = bp->l_freelist;
1910 LCACHE_UNLOCK(flags);
1911
1912 bp->l_flag = 0;
1913
1914 bp->l_wqnext = NULL;
1915 bp->l_freelist = NULL;
1916
1917 bp->l_pn = pn;
1918 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1919 bp->l_ceor = 0;
1920
1921 return bp;
1922}
1923
1924
1925/*
1926 * lbmFree()
1927 *
1928 * release a log buffer to freelist
1929 */
1930static void lbmFree(struct lbuf * bp)
1931{
1932 unsigned long flags;
1933
1934 LCACHE_LOCK(flags);
1935
1936 lbmfree(bp);
1937
1938 LCACHE_UNLOCK(flags);
1939}
1940
1941static void lbmfree(struct lbuf * bp)
1942{
1943 struct jfs_log *log = bp->l_log;
1944
1945 assert(bp->l_wqnext == NULL);
1946
1947 /*
1948 * return the buffer to head of freelist
1949 */
1950 bp->l_freelist = log->lbuf_free;
1951 log->lbuf_free = bp;
1952
1953 wake_up(&log->free_wait);
1954 return;
1955}
1956
1957
1958/*
1959 * NAME: lbmRedrive
1960 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02001961 * FUNCTION: add a log buffer to the log redrive list
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 *
1963 * PARAMETER:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001964 * bp - log buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 *
1966 * NOTES:
1967 * Takes log_redrive_lock.
1968 */
1969static inline void lbmRedrive(struct lbuf *bp)
1970{
1971 unsigned long flags;
1972
1973 spin_lock_irqsave(&log_redrive_lock, flags);
1974 bp->l_redrive_next = log_redrive_list;
1975 log_redrive_list = bp;
1976 spin_unlock_irqrestore(&log_redrive_lock, flags);
1977
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06001978 wake_up_process(jfsIOthread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979}
1980
1981
1982/*
1983 * lbmRead()
1984 */
1985static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1986{
1987 struct bio *bio;
1988 struct lbuf *bp;
1989
1990 /*
1991 * allocate a log buffer
1992 */
1993 *bpp = bp = lbmAllocate(log, pn);
1994 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
1995
1996 bp->l_flag |= lbmREAD;
1997
1998 bio = bio_alloc(GFP_NOFS, 1);
1999
2000 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2001 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002002 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002004 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005
2006 bio->bi_vcnt = 1;
2007 bio->bi_idx = 0;
2008 bio->bi_size = LOGPSIZE;
2009
2010 bio->bi_end_io = lbmIODone;
2011 bio->bi_private = bp;
2012 submit_bio(READ_SYNC, bio);
2013
2014 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2015
2016 return 0;
2017}
2018
2019
2020/*
2021 * lbmWrite()
2022 *
2023 * buffer at head of pageout queue stays after completion of
2024 * partial-page pageout and redriven by explicit initiation of
2025 * pageout by caller until full-page pageout is completed and
2026 * released.
2027 *
2028 * device driver i/o done redrives pageout of new buffer at
2029 * head of pageout queue when current buffer at head of pageout
2030 * queue is released at the completion of its full-page pageout.
2031 *
2032 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2033 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2034 */
2035static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2036 int cant_block)
2037{
2038 struct lbuf *tail;
2039 unsigned long flags;
2040
2041 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2042
2043 /* map the logical block address to physical block address */
2044 bp->l_blkno =
2045 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2046
2047 LCACHE_LOCK(flags); /* disable+lock */
2048
2049 /*
2050 * initialize buffer for device driver
2051 */
2052 bp->l_flag = flag;
2053
2054 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002055 * insert bp at tail of write queue associated with log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 *
2057 * (request is either for bp already/currently at head of queue
2058 * or new bp to be inserted at tail)
2059 */
2060 tail = log->wqueue;
2061
2062 /* is buffer not already on write queue ? */
2063 if (bp->l_wqnext == NULL) {
2064 /* insert at tail of wqueue */
2065 if (tail == NULL) {
2066 log->wqueue = bp;
2067 bp->l_wqnext = bp;
2068 } else {
2069 log->wqueue = bp;
2070 bp->l_wqnext = tail->l_wqnext;
2071 tail->l_wqnext = bp;
2072 }
2073
2074 tail = bp;
2075 }
2076
2077 /* is buffer at head of wqueue and for write ? */
2078 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) {
2079 LCACHE_UNLOCK(flags); /* unlock+enable */
2080 return;
2081 }
2082
2083 LCACHE_UNLOCK(flags); /* unlock+enable */
2084
2085 if (cant_block)
2086 lbmRedrive(bp);
2087 else if (flag & lbmSYNC)
2088 lbmStartIO(bp);
2089 else {
2090 LOGGC_UNLOCK(log);
2091 lbmStartIO(bp);
2092 LOGGC_LOCK(log);
2093 }
2094}
2095
2096
2097/*
2098 * lbmDirectWrite()
2099 *
2100 * initiate pageout bypassing write queue for sidestream
2101 * (e.g., log superblock) write;
2102 */
2103static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2104{
2105 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2106 bp, flag, bp->l_pn);
2107
2108 /*
2109 * initialize buffer for device driver
2110 */
2111 bp->l_flag = flag | lbmDIRECT;
2112
2113 /* map the logical block address to physical block address */
2114 bp->l_blkno =
2115 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2116
2117 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002118 * initiate pageout of the page
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 */
2120 lbmStartIO(bp);
2121}
2122
2123
2124/*
2125 * NAME: lbmStartIO()
2126 *
2127 * FUNCTION: Interface to DD strategy routine
2128 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002129 * RETURN: none
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 *
2131 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2132 */
2133static void lbmStartIO(struct lbuf * bp)
2134{
2135 struct bio *bio;
2136 struct jfs_log *log = bp->l_log;
2137
2138 jfs_info("lbmStartIO\n");
2139
2140 bio = bio_alloc(GFP_NOFS, 1);
2141 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2142 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002143 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002145 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
2147 bio->bi_vcnt = 1;
2148 bio->bi_idx = 0;
2149 bio->bi_size = LOGPSIZE;
2150
2151 bio->bi_end_io = lbmIODone;
2152 bio->bi_private = bp;
2153
2154 /* check if journaling to disk has been disabled */
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002155 if (log->no_integrity) {
2156 bio->bi_size = 0;
Jeff Garzike30408b2007-10-12 00:01:21 -04002157 lbmIODone(bio, 0);
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002158 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 submit_bio(WRITE_SYNC, bio);
2160 INCREMENT(lmStat.submitted);
2161 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162}
2163
2164
2165/*
2166 * lbmIOWait()
2167 */
2168static int lbmIOWait(struct lbuf * bp, int flag)
2169{
2170 unsigned long flags;
2171 int rc = 0;
2172
2173 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2174
2175 LCACHE_LOCK(flags); /* disable+lock */
2176
2177 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2178
2179 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2180
2181 if (flag & lbmFREE)
2182 lbmfree(bp);
2183
2184 LCACHE_UNLOCK(flags); /* unlock+enable */
2185
2186 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2187 return rc;
2188}
2189
2190/*
2191 * lbmIODone()
2192 *
2193 * executed at INTIODONE level
2194 */
NeilBrown6712ecf2007-09-27 12:47:43 +02002195static void lbmIODone(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196{
2197 struct lbuf *bp = bio->bi_private;
2198 struct lbuf *nextbp, *tail;
2199 struct jfs_log *log;
2200 unsigned long flags;
2201
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 /*
2203 * get back jfs buffer bound to the i/o buffer
2204 */
2205 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2206
2207 LCACHE_LOCK(flags); /* disable+lock */
2208
2209 bp->l_flag |= lbmDONE;
2210
2211 if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
2212 bp->l_flag |= lbmERROR;
2213
2214 jfs_err("lbmIODone: I/O error in JFS log");
2215 }
2216
2217 bio_put(bio);
2218
2219 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002220 * pagein completion
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 */
2222 if (bp->l_flag & lbmREAD) {
2223 bp->l_flag &= ~lbmREAD;
2224
2225 LCACHE_UNLOCK(flags); /* unlock+enable */
2226
2227 /* wakeup I/O initiator */
2228 LCACHE_WAKEUP(&bp->l_ioevent);
Dave Kleikamp8d8fe642007-10-13 12:58:00 -05002229
2230 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231 }
2232
2233 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002234 * pageout completion
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235 *
2236 * the bp at the head of write queue has completed pageout.
2237 *
2238 * if single-commit/full-page pageout, remove the current buffer
2239 * from head of pageout queue, and redrive pageout with
2240 * the new buffer at head of pageout queue;
2241 * otherwise, the partial-page pageout buffer stays at
2242 * the head of pageout queue to be redriven for pageout
2243 * by lmGroupCommit() until full-page pageout is completed.
2244 */
2245 bp->l_flag &= ~lbmWRITE;
2246 INCREMENT(lmStat.pagedone);
2247
2248 /* update committed lsn */
2249 log = bp->l_log;
2250 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2251
2252 if (bp->l_flag & lbmDIRECT) {
2253 LCACHE_WAKEUP(&bp->l_ioevent);
2254 LCACHE_UNLOCK(flags);
Dave Kleikamp8d8fe642007-10-13 12:58:00 -05002255 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 }
2257
2258 tail = log->wqueue;
2259
2260 /* single element queue */
2261 if (bp == tail) {
2262 /* remove head buffer of full-page pageout
2263 * from log device write queue
2264 */
2265 if (bp->l_flag & lbmRELEASE) {
2266 log->wqueue = NULL;
2267 bp->l_wqnext = NULL;
2268 }
2269 }
2270 /* multi element queue */
2271 else {
2272 /* remove head buffer of full-page pageout
2273 * from log device write queue
2274 */
2275 if (bp->l_flag & lbmRELEASE) {
2276 nextbp = tail->l_wqnext = bp->l_wqnext;
2277 bp->l_wqnext = NULL;
2278
2279 /*
2280 * redrive pageout of next page at head of write queue:
2281 * redrive next page without any bound tblk
2282 * (i.e., page w/o any COMMIT records), or
2283 * first page of new group commit which has been
2284 * queued after current page (subsequent pageout
2285 * is performed synchronously, except page without
2286 * any COMMITs) by lmGroupCommit() as indicated
2287 * by lbmWRITE flag;
2288 */
2289 if (nextbp->l_flag & lbmWRITE) {
2290 /*
2291 * We can't do the I/O at interrupt time.
2292 * The jfsIO thread can do it
2293 */
2294 lbmRedrive(nextbp);
2295 }
2296 }
2297 }
2298
2299 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002300 * synchronous pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 *
2302 * buffer has not necessarily been removed from write queue
2303 * (e.g., synchronous write of partial-page with COMMIT):
2304 * leave buffer for i/o initiator to dispose
2305 */
2306 if (bp->l_flag & lbmSYNC) {
2307 LCACHE_UNLOCK(flags); /* unlock+enable */
2308
2309 /* wakeup I/O initiator */
2310 LCACHE_WAKEUP(&bp->l_ioevent);
2311 }
2312
2313 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002314 * Group Commit pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315 */
2316 else if (bp->l_flag & lbmGC) {
2317 LCACHE_UNLOCK(flags);
2318 lmPostGC(bp);
2319 }
2320
2321 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002322 * asynchronous pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323 *
2324 * buffer must have been removed from write queue:
2325 * insert buffer at head of freelist where it can be recycled
2326 */
2327 else {
2328 assert(bp->l_flag & lbmRELEASE);
2329 assert(bp->l_flag & lbmFREE);
2330 lbmfree(bp);
2331
2332 LCACHE_UNLOCK(flags); /* unlock+enable */
2333 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002334}
2335
2336int jfsIOWait(void *arg)
2337{
2338 struct lbuf *bp;
2339
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341 spin_lock_irq(&log_redrive_lock);
Joe Perches09aaa742007-11-13 22:16:08 -06002342 while ((bp = log_redrive_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343 log_redrive_list = bp->l_redrive_next;
2344 bp->l_redrive_next = NULL;
2345 spin_unlock_irq(&log_redrive_lock);
2346 lbmStartIO(bp);
2347 spin_lock_irq(&log_redrive_lock);
2348 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002349
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002350 if (freezing(current)) {
Dave Kleikamp05ec9e22007-05-05 14:24:05 -05002351 spin_unlock_irq(&log_redrive_lock);
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002352 refrigerator();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354 set_current_state(TASK_INTERRUPTIBLE);
Dave Kleikamp05ec9e22007-05-05 14:24:05 -05002355 spin_unlock_irq(&log_redrive_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356 schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05002357 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002359 } while (!kthread_should_stop());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360
2361 jfs_info("jfsIOWait being killed!");
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002362 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363}
2364
2365/*
2366 * NAME: lmLogFormat()/jfs_logform()
2367 *
2368 * FUNCTION: format file system log
2369 *
2370 * PARAMETERS:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002371 * log - volume log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002372 * logAddress - start address of log space in FS block
2373 * logSize - length of log space in FS block;
2374 *
2375 * RETURN: 0 - success
2376 * -EIO - i/o error
2377 *
2378 * XXX: We're synchronously writing one page at a time. This needs to
2379 * be improved by writing multiple pages at once.
2380 */
2381int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
2382{
2383 int rc = -EIO;
2384 struct jfs_sb_info *sbi;
2385 struct logsuper *logsuper;
2386 struct logpage *lp;
2387 int lspn; /* log sequence page number */
2388 struct lrd *lrd_ptr;
2389 int npages = 0;
2390 struct lbuf *bp;
2391
2392 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2393 (long long)logAddress, logSize);
2394
2395 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2396
2397 /* allocate a log buffer */
2398 bp = lbmAllocate(log, 1);
2399
2400 npages = logSize >> sbi->l2nbperpage;
2401
2402 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002403 * log space:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404 *
2405 * page 0 - reserved;
2406 * page 1 - log superblock;
2407 * page 2 - log data page: A SYNC log record is written
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002408 * into this page at logform time;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409 * pages 3-N - log data page: set to empty log data pages;
2410 */
2411 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002412 * init log superblock: log page 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413 */
2414 logsuper = (struct logsuper *) bp->l_ldata;
2415
2416 logsuper->magic = cpu_to_le32(LOGMAGIC);
2417 logsuper->version = cpu_to_le32(LOGVERSION);
2418 logsuper->state = cpu_to_le32(LOGREDONE);
2419 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */
2420 logsuper->size = cpu_to_le32(npages);
2421 logsuper->bsize = cpu_to_le32(sbi->bsize);
2422 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
2423 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
2424
2425 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2426 bp->l_blkno = logAddress + sbi->nbperpage;
2427 lbmStartIO(bp);
2428 if ((rc = lbmIOWait(bp, 0)))
2429 goto exit;
2430
2431 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002432 * init pages 2 to npages-1 as log data pages:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 *
2434 * log page sequence number (lpsn) initialization:
2435 *
2436 * pn: 0 1 2 3 n-1
2437 * +-----+-----+=====+=====+===.....===+=====+
2438 * lspn: N-1 0 1 N-2
2439 * <--- N page circular file ---->
2440 *
2441 * the N (= npages-2) data pages of the log is maintained as
2442 * a circular file for the log records;
2443 * lpsn grows by 1 monotonically as each log page is written
2444 * to the circular file of the log;
2445 * and setLogpage() will not reset the page number even if
2446 * the eor is equal to LOGPHDRSIZE. In order for binary search
2447 * still work in find log end process, we have to simulate the
2448 * log wrap situation at the log format time.
2449 * The 1st log page written will have the highest lpsn. Then
2450 * the succeeding log pages will have ascending order of
2451 * the lspn starting from 0, ... (N-2)
2452 */
2453 lp = (struct logpage *) bp->l_ldata;
2454 /*
2455 * initialize 1st log page to be written: lpsn = N - 1,
2456 * write a SYNCPT log record is written to this page
2457 */
2458 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2459 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
2460
2461 lrd_ptr = (struct lrd *) &lp->data;
2462 lrd_ptr->logtid = 0;
2463 lrd_ptr->backchain = 0;
2464 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT);
2465 lrd_ptr->length = 0;
2466 lrd_ptr->log.syncpt.sync = 0;
2467
2468 bp->l_blkno += sbi->nbperpage;
2469 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2470 lbmStartIO(bp);
2471 if ((rc = lbmIOWait(bp, 0)))
2472 goto exit;
2473
2474 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002475 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 */
2477 for (lspn = 0; lspn < npages - 3; lspn++) {
2478 lp->h.page = lp->t.page = cpu_to_le32(lspn);
2479 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
2480
2481 bp->l_blkno += sbi->nbperpage;
2482 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2483 lbmStartIO(bp);
2484 if ((rc = lbmIOWait(bp, 0)))
2485 goto exit;
2486 }
2487
2488 rc = 0;
2489exit:
2490 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002491 * finalize log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492 */
2493 /* release the buffer */
2494 lbmFree(bp);
2495
2496 return rc;
2497}
2498
2499#ifdef CONFIG_JFS_STATISTICS
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002500static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501{
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002502 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 "JFS Logmgr stats\n"
2504 "================\n"
2505 "commits = %d\n"
2506 "writes submitted = %d\n"
2507 "writes completed = %d\n"
2508 "full pages submitted = %d\n"
2509 "partial pages submitted = %d\n",
2510 lmStat.commit,
2511 lmStat.submitted,
2512 lmStat.pagedone,
2513 lmStat.full_page,
2514 lmStat.partial_page);
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002515 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516}
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002517
2518static int jfs_lmstats_proc_open(struct inode *inode, struct file *file)
2519{
2520 return single_open(file, jfs_lmstats_proc_show, NULL);
2521}
2522
2523const struct file_operations jfs_lmstats_proc_fops = {
2524 .owner = THIS_MODULE,
2525 .open = jfs_lmstats_proc_open,
2526 .read = seq_read,
2527 .llseek = seq_lseek,
2528 .release = single_release,
2529};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530#endif /* CONFIG_JFS_STATISTICS */