blob: e1b8493b9aaaa10c8a80762efaf0316adfae869c [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/delay.h>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080071#include <linux/mutex.h>
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -050072#include <linux/seq_file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090073#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#include "jfs_incore.h"
75#include "jfs_filsys.h"
76#include "jfs_metapage.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050077#include "jfs_superblock.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#include "jfs_txnmgr.h"
79#include "jfs_debug.h"
80
81
82/*
83 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread)
84 */
85static struct lbuf *log_redrive_list;
86static DEFINE_SPINLOCK(log_redrive_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88
89/*
90 * log read/write serialization (per log)
91 */
Ingo Molnar1de87442006-01-24 15:22:50 -060092#define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock)
93#define LOG_LOCK(log) mutex_lock(&((log)->loglock))
94#define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock))
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96
97/*
98 * log group commit serialization (per log)
99 */
100
101#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock)
102#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock)
103#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock)
104#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait)
105
106/*
107 * log sync serialization (per log)
108 */
109#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE)
110#define LOGSYNC_BARRIER(logsize) ((logsize)/4)
111/*
112#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE)
113#define LOGSYNC_BARRIER(logsize) ((logsize)/2)
114*/
115
116
117/*
118 * log buffer cache synchronization
119 */
120static DEFINE_SPINLOCK(jfsLCacheLock);
121
122#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags)
123#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags)
124
125/*
126 * See __SLEEP_COND in jfs_locks.h
127 */
128#define LCACHE_SLEEP_COND(wq, cond, flags) \
129do { \
130 if (cond) \
131 break; \
132 __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \
133} while (0)
134
135#define LCACHE_WAKEUP(event) wake_up(event)
136
137
138/*
139 * lbuf buffer cache (lCache) control
140 */
141/* log buffer manager pageout control (cumulative, inclusive) */
142#define lbmREAD 0x0001
143#define lbmWRITE 0x0002 /* enqueue at tail of write queue;
144 * init pageout if at head of queue;
145 */
146#define lbmRELEASE 0x0004 /* remove from write queue
147 * at completion of pageout;
148 * do not free/recycle it yet:
149 * caller will free it;
150 */
151#define lbmSYNC 0x0008 /* do not return to freelist
152 * when removed from write queue;
153 */
154#define lbmFREE 0x0010 /* return to freelist
155 * at completion of pageout;
156 * the buffer may be recycled;
157 */
158#define lbmDONE 0x0020
159#define lbmERROR 0x0040
160#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing
161 * of log page
162 */
163#define lbmDIRECT 0x0100
164
165/*
166 * Global list of active external journals
167 */
168static LIST_HEAD(jfs_external_logs);
169static struct jfs_log *dummy_log = NULL;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800170static DEFINE_MUTEX(jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * forward references
174 */
175static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,
176 struct lrd * lrd, struct tlock * tlck);
177
178static int lmNextPage(struct jfs_log * log);
179static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
180 int activate);
181
182static int open_inline_log(struct super_block *sb);
183static int open_dummy_log(struct super_block *sb);
184static int lbmLogInit(struct jfs_log * log);
185static void lbmLogShutdown(struct jfs_log * log);
186static struct lbuf *lbmAllocate(struct jfs_log * log, int);
187static void lbmFree(struct lbuf * bp);
188static void lbmfree(struct lbuf * bp);
189static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp);
190static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block);
191static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag);
192static int lbmIOWait(struct lbuf * bp, int flag);
193static bio_end_io_t lbmIODone;
194static void lbmStartIO(struct lbuf * bp);
195static void lmGCwrite(struct jfs_log * log, int cant_block);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500196static int lmLogSync(struct jfs_log * log, int hard_sync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198
199
200/*
201 * statistics
202 */
203#ifdef CONFIG_JFS_STATISTICS
204static struct lmStat {
205 uint commit; /* # of commit */
206 uint pagedone; /* # of page written */
207 uint submitted; /* # of pages submitted */
208 uint full_page; /* # of full pages submitted */
209 uint partial_page; /* # of partial pages submitted */
210} lmStat;
211#endif
212
Dave Kleikamp67e66822007-10-10 11:11:24 -0500213static void write_special_inodes(struct jfs_log *log,
214 int (*writer)(struct address_space *))
215{
216 struct jfs_sb_info *sbi;
217
218 list_for_each_entry(sbi, &log->sb_list, log_list) {
219 writer(sbi->ipbmap->i_mapping);
220 writer(sbi->ipimap->i_mapping);
221 writer(sbi->direct_inode->i_mapping);
222 }
223}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225/*
226 * NAME: lmLog()
227 *
228 * FUNCTION: write a log record;
229 *
230 * PARAMETER:
231 *
232 * RETURN: lsn - offset to the next log record to write (end-of-log);
233 * -1 - error;
234 *
235 * note: todo: log error handler
236 */
237int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
238 struct tlock * tlck)
239{
240 int lsn;
241 int diffp, difft;
242 struct metapage *mp = NULL;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600243 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p",
246 log, tblk, lrd, tlck);
247
248 LOG_LOCK(log);
249
250 /* log by (out-of-transaction) JFS ? */
251 if (tblk == NULL)
252 goto writeRecord;
253
254 /* log from page ? */
255 if (tlck == NULL ||
256 tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL)
257 goto writeRecord;
258
259 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500260 * initialize/update page/transaction recovery lsn
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 */
262 lsn = log->lsn;
263
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600264 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 /*
267 * initialize page lsn if first log write of the page
268 */
269 if (mp->lsn == 0) {
270 mp->log = log;
271 mp->lsn = lsn;
272 log->count++;
273
274 /* insert page at tail of logsynclist */
275 list_add_tail(&mp->synclist, &log->synclist);
276 }
277
278 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500279 * initialize/update lsn of tblock of the page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 *
281 * transaction inherits oldest lsn of pages associated
282 * with allocation/deallocation of resources (their
283 * log records are used to reconstruct allocation map
284 * at recovery time: inode for inode allocation map,
285 * B+-tree index of extent descriptors for block
286 * allocation map);
287 * allocation map pages inherit transaction lsn at
288 * commit time to allow forwarding log syncpt past log
289 * records associated with allocation/deallocation of
290 * resources only after persistent map of these map pages
291 * have been updated and propagated to home.
292 */
293 /*
294 * initialize transaction lsn:
295 */
296 if (tblk->lsn == 0) {
297 /* inherit lsn of its first page logged */
298 tblk->lsn = mp->lsn;
299 log->count++;
300
301 /* insert tblock after the page on logsynclist */
302 list_add(&tblk->synclist, &mp->synclist);
303 }
304 /*
305 * update transaction lsn:
306 */
307 else {
308 /* inherit oldest/smallest lsn of page */
309 logdiff(diffp, mp->lsn, log);
310 logdiff(difft, tblk->lsn, log);
311 if (diffp < difft) {
312 /* update tblock lsn with page lsn */
313 tblk->lsn = mp->lsn;
314
315 /* move tblock after page on logsynclist */
316 list_move(&tblk->synclist, &mp->synclist);
317 }
318 }
319
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600320 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500323 * write the log record
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 */
325 writeRecord:
326 lsn = lmWriteRecord(log, tblk, lrd, tlck);
327
328 /*
329 * forward log syncpt if log reached next syncpt trigger
330 */
331 logdiff(diffp, lsn, log);
332 if (diffp >= log->nextsync)
333 lsn = lmLogSync(log, 0);
334
335 /* update end-of-log lsn */
336 log->lsn = lsn;
337
338 LOG_UNLOCK(log);
339
340 /* return end-of-log address */
341 return lsn;
342}
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344/*
345 * NAME: lmWriteRecord()
346 *
347 * FUNCTION: move the log record to current log page
348 *
349 * PARAMETER: cd - commit descriptor
350 *
351 * RETURN: end-of-log address
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500352 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 * serialization: LOG_LOCK() held on entry/exit
354 */
355static int
356lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd,
357 struct tlock * tlck)
358{
359 int lsn = 0; /* end-of-log address */
360 struct lbuf *bp; /* dst log page buffer */
361 struct logpage *lp; /* dst log page */
362 caddr_t dst; /* destination address in log page */
363 int dstoffset; /* end-of-log offset in log page */
364 int freespace; /* free space in log page */
365 caddr_t p; /* src meta-data page */
366 caddr_t src;
367 int srclen;
368 int nbytes; /* number of bytes to move */
369 int i;
370 int len;
371 struct linelock *linelock;
372 struct lv *lv;
373 struct lvd *lvd;
374 int l2linesize;
375
376 len = 0;
377
378 /* retrieve destination log page to write */
379 bp = (struct lbuf *) log->bp;
380 lp = (struct logpage *) bp->l_ldata;
381 dstoffset = log->eor;
382
383 /* any log data to write ? */
384 if (tlck == NULL)
385 goto moveLrd;
386
387 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500388 * move log record data
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 */
390 /* retrieve source meta-data page to log */
391 if (tlck->flag & tlckPAGELOCK) {
392 p = (caddr_t) (tlck->mp->data);
393 linelock = (struct linelock *) & tlck->lock;
394 }
395 /* retrieve source in-memory inode to log */
396 else if (tlck->flag & tlckINODELOCK) {
397 if (tlck->type & tlckDTREE)
398 p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot;
399 else
400 p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot;
401 linelock = (struct linelock *) & tlck->lock;
402 }
403#ifdef _JFS_WIP
404 else if (tlck->flag & tlckINLINELOCK) {
405
406 inlinelock = (struct inlinelock *) & tlck;
407 p = (caddr_t) & inlinelock->pxd;
408 linelock = (struct linelock *) & tlck;
409 }
410#endif /* _JFS_WIP */
411 else {
412 jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck);
413 return 0; /* Probably should trap */
414 }
415 l2linesize = linelock->l2linesize;
416
417 moveData:
418 ASSERT(linelock->index <= linelock->maxcnt);
419
420 lv = linelock->lv;
421 for (i = 0; i < linelock->index; i++, lv++) {
422 if (lv->length == 0)
423 continue;
424
425 /* is page full ? */
426 if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) {
427 /* page become full: move on to next page */
428 lmNextPage(log);
429
430 bp = log->bp;
431 lp = (struct logpage *) bp->l_ldata;
432 dstoffset = LOGPHDRSIZE;
433 }
434
435 /*
436 * move log vector data
437 */
438 src = (u8 *) p + (lv->offset << l2linesize);
439 srclen = lv->length << l2linesize;
440 len += srclen;
441 while (srclen > 0) {
442 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
443 nbytes = min(freespace, srclen);
444 dst = (caddr_t) lp + dstoffset;
445 memcpy(dst, src, nbytes);
446 dstoffset += nbytes;
447
448 /* is page not full ? */
449 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
450 break;
451
452 /* page become full: move on to next page */
453 lmNextPage(log);
454
455 bp = (struct lbuf *) log->bp;
456 lp = (struct logpage *) bp->l_ldata;
457 dstoffset = LOGPHDRSIZE;
458
459 srclen -= nbytes;
460 src += nbytes;
461 }
462
463 /*
464 * move log vector descriptor
465 */
466 len += 4;
467 lvd = (struct lvd *) ((caddr_t) lp + dstoffset);
468 lvd->offset = cpu_to_le16(lv->offset);
469 lvd->length = cpu_to_le16(lv->length);
470 dstoffset += 4;
471 jfs_info("lmWriteRecord: lv offset:%d length:%d",
472 lv->offset, lv->length);
473 }
474
475 if ((i = linelock->next)) {
476 linelock = (struct linelock *) lid_to_tlock(i);
477 goto moveData;
478 }
479
480 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500481 * move log record descriptor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 */
483 moveLrd:
484 lrd->length = cpu_to_le16(len);
485
486 src = (caddr_t) lrd;
487 srclen = LOGRDSIZE;
488
489 while (srclen > 0) {
490 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset;
491 nbytes = min(freespace, srclen);
492 dst = (caddr_t) lp + dstoffset;
493 memcpy(dst, src, nbytes);
494
495 dstoffset += nbytes;
496 srclen -= nbytes;
497
498 /* are there more to move than freespace of page ? */
499 if (srclen)
500 goto pageFull;
501
502 /*
503 * end of log record descriptor
504 */
505
506 /* update last log record eor */
507 log->eor = dstoffset;
508 bp->l_eor = dstoffset;
509 lsn = (log->page << L2LOGPSIZE) + dstoffset;
510
511 if (lrd->type & cpu_to_le16(LOG_COMMIT)) {
512 tblk->clsn = lsn;
513 jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn,
514 bp->l_eor);
515
516 INCREMENT(lmStat.commit); /* # of commit */
517
518 /*
519 * enqueue tblock for group commit:
520 *
521 * enqueue tblock of non-trivial/synchronous COMMIT
522 * at tail of group commit queue
523 * (trivial/asynchronous COMMITs are ignored by
524 * group commit.)
525 */
526 LOGGC_LOCK(log);
527
528 /* init tblock gc state */
529 tblk->flag = tblkGC_QUEUE;
530 tblk->bp = log->bp;
531 tblk->pn = log->page;
532 tblk->eor = log->eor;
533
534 /* enqueue transaction to commit queue */
535 list_add_tail(&tblk->cqueue, &log->cqueue);
536
537 LOGGC_UNLOCK(log);
538 }
539
540 jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x",
541 le16_to_cpu(lrd->type), log->bp, log->page, dstoffset);
542
543 /* page not full ? */
544 if (dstoffset < LOGPSIZE - LOGPTLRSIZE)
545 return lsn;
546
547 pageFull:
548 /* page become full: move on to next page */
549 lmNextPage(log);
550
551 bp = (struct lbuf *) log->bp;
552 lp = (struct logpage *) bp->l_ldata;
553 dstoffset = LOGPHDRSIZE;
554 src += nbytes;
555 }
556
557 return lsn;
558}
559
560
561/*
562 * NAME: lmNextPage()
563 *
564 * FUNCTION: write current page and allocate next page.
565 *
566 * PARAMETER: log
567 *
568 * RETURN: 0
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500569 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 * serialization: LOG_LOCK() held on entry/exit
571 */
572static int lmNextPage(struct jfs_log * log)
573{
574 struct logpage *lp;
575 int lspn; /* log sequence page number */
576 int pn; /* current page number */
577 struct lbuf *bp;
578 struct lbuf *nextbp;
579 struct tblock *tblk;
580
581 /* get current log page number and log sequence page number */
582 pn = log->page;
583 bp = log->bp;
584 lp = (struct logpage *) bp->l_ldata;
585 lspn = le32_to_cpu(lp->h.page);
586
587 LOGGC_LOCK(log);
588
589 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500590 * write or queue the full page at the tail of write queue
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 */
592 /* get the tail tblk on commit queue */
593 if (list_empty(&log->cqueue))
594 tblk = NULL;
595 else
596 tblk = list_entry(log->cqueue.prev, struct tblock, cqueue);
597
598 /* every tblk who has COMMIT record on the current page,
599 * and has not been committed, must be on commit queue
600 * since tblk is queued at commit queueu at the time
601 * of writing its COMMIT record on the page before
602 * page becomes full (even though the tblk thread
603 * who wrote COMMIT record may have been suspended
604 * currently);
605 */
606
607 /* is page bound with outstanding tail tblk ? */
608 if (tblk && tblk->pn == pn) {
609 /* mark tblk for end-of-page */
610 tblk->flag |= tblkGC_EOP;
611
612 if (log->cflag & logGC_PAGEOUT) {
613 /* if page is not already on write queue,
614 * just enqueue (no lbmWRITE to prevent redrive)
615 * buffer to wqueue to ensure correct serial order
616 * of the pages since log pages will be added
617 * continuously
618 */
619 if (bp->l_wqnext == NULL)
620 lbmWrite(log, bp, 0, 0);
621 } else {
622 /*
623 * No current GC leader, initiate group commit
624 */
625 log->cflag |= logGC_PAGEOUT;
626 lmGCwrite(log, 0);
627 }
628 }
629 /* page is not bound with outstanding tblk:
630 * init write or mark it to be redriven (lbmWRITE)
631 */
632 else {
633 /* finalize the page */
634 bp->l_ceor = bp->l_eor;
635 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
636 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0);
637 }
638 LOGGC_UNLOCK(log);
639
640 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500641 * allocate/initialize next page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 */
643 /* if log wraps, the first data page of log is 2
644 * (0 never used, 1 is superblock).
645 */
646 log->page = (pn == log->size - 1) ? 2 : pn + 1;
647 log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */
648
649 /* allocate/initialize next log page buffer */
650 nextbp = lbmAllocate(log, log->page);
651 nextbp->l_eor = log->eor;
652 log->bp = nextbp;
653
654 /* initialize next log page */
655 lp = (struct logpage *) nextbp->l_ldata;
656 lp->h.page = lp->t.page = cpu_to_le32(lspn + 1);
657 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
658
659 return 0;
660}
661
662
663/*
664 * NAME: lmGroupCommit()
665 *
666 * FUNCTION: group commit
667 * initiate pageout of the pages with COMMIT in the order of
668 * page number - redrive pageout of the page at the head of
669 * pageout queue until full page has been written.
670 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500671 * RETURN:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 *
673 * NOTE:
674 * LOGGC_LOCK serializes log group commit queue, and
675 * transaction blocks on the commit queue.
676 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
677 */
678int lmGroupCommit(struct jfs_log * log, struct tblock * tblk)
679{
680 int rc = 0;
681
682 LOGGC_LOCK(log);
683
684 /* group committed already ? */
685 if (tblk->flag & tblkGC_COMMITTED) {
686 if (tblk->flag & tblkGC_ERROR)
687 rc = -EIO;
688
689 LOGGC_UNLOCK(log);
690 return rc;
691 }
692 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc);
693
694 if (tblk->xflag & COMMIT_LAZY)
695 tblk->flag |= tblkGC_LAZY;
696
697 if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) &&
698 (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag)
699 || jfs_tlocks_low)) {
700 /*
701 * No pageout in progress
702 *
703 * start group commit as its group leader.
704 */
705 log->cflag |= logGC_PAGEOUT;
706
707 lmGCwrite(log, 0);
708 }
709
710 if (tblk->xflag & COMMIT_LAZY) {
711 /*
712 * Lazy transactions can leave now
713 */
714 LOGGC_UNLOCK(log);
715 return 0;
716 }
717
718 /* lmGCwrite gives up LOGGC_LOCK, check again */
719
720 if (tblk->flag & tblkGC_COMMITTED) {
721 if (tblk->flag & tblkGC_ERROR)
722 rc = -EIO;
723
724 LOGGC_UNLOCK(log);
725 return rc;
726 }
727
728 /* upcount transaction waiting for completion
729 */
730 log->gcrtc++;
731 tblk->flag |= tblkGC_READY;
732
733 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED),
734 LOGGC_LOCK(log), LOGGC_UNLOCK(log));
735
736 /* removed from commit queue */
737 if (tblk->flag & tblkGC_ERROR)
738 rc = -EIO;
739
740 LOGGC_UNLOCK(log);
741 return rc;
742}
743
744/*
745 * NAME: lmGCwrite()
746 *
747 * FUNCTION: group commit write
748 * initiate write of log page, building a group of all transactions
749 * with commit records on that page.
750 *
751 * RETURN: None
752 *
753 * NOTE:
754 * LOGGC_LOCK must be held by caller.
755 * N.B. LOG_LOCK is NOT held during lmGroupCommit().
756 */
757static void lmGCwrite(struct jfs_log * log, int cant_write)
758{
759 struct lbuf *bp;
760 struct logpage *lp;
761 int gcpn; /* group commit page number */
762 struct tblock *tblk;
763 struct tblock *xtblk = NULL;
764
765 /*
766 * build the commit group of a log page
767 *
768 * scan commit queue and make a commit group of all
769 * transactions with COMMIT records on the same log page.
770 */
771 /* get the head tblk on the commit queue */
772 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn;
773
774 list_for_each_entry(tblk, &log->cqueue, cqueue) {
775 if (tblk->pn != gcpn)
776 break;
777
778 xtblk = tblk;
779
780 /* state transition: (QUEUE, READY) -> COMMIT */
781 tblk->flag |= tblkGC_COMMIT;
782 }
783 tblk = xtblk; /* last tblk of the page */
784
785 /*
786 * pageout to commit transactions on the log page.
787 */
788 bp = (struct lbuf *) tblk->bp;
789 lp = (struct logpage *) bp->l_ldata;
790 /* is page already full ? */
791 if (tblk->flag & tblkGC_EOP) {
792 /* mark page to free at end of group commit of the page */
793 tblk->flag &= ~tblkGC_EOP;
794 tblk->flag |= tblkGC_FREE;
795 bp->l_ceor = bp->l_eor;
796 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
797 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC,
798 cant_write);
799 INCREMENT(lmStat.full_page);
800 }
801 /* page is not yet full */
802 else {
803 bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */
804 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor);
805 lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write);
806 INCREMENT(lmStat.partial_page);
807 }
808}
809
810/*
811 * NAME: lmPostGC()
812 *
813 * FUNCTION: group commit post-processing
814 * Processes transactions after their commit records have been written
815 * to disk, redriving log I/O if necessary.
816 *
817 * RETURN: None
818 *
819 * NOTE:
820 * This routine is called a interrupt time by lbmIODone
821 */
822static void lmPostGC(struct lbuf * bp)
823{
824 unsigned long flags;
825 struct jfs_log *log = bp->l_log;
826 struct logpage *lp;
827 struct tblock *tblk, *temp;
828
829 //LOGGC_LOCK(log);
830 spin_lock_irqsave(&log->gclock, flags);
831 /*
832 * current pageout of group commit completed.
833 *
834 * remove/wakeup transactions from commit queue who were
835 * group committed with the current log page
836 */
837 list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) {
838 if (!(tblk->flag & tblkGC_COMMIT))
839 break;
840 /* if transaction was marked GC_COMMIT then
841 * it has been shipped in the current pageout
842 * and made it to disk - it is committed.
843 */
844
845 if (bp->l_flag & lbmERROR)
846 tblk->flag |= tblkGC_ERROR;
847
848 /* remove it from the commit queue */
849 list_del(&tblk->cqueue);
850 tblk->flag &= ~tblkGC_QUEUE;
851
852 if (tblk == log->flush_tblk) {
853 /* we can stop flushing the log now */
854 clear_bit(log_FLUSH, &log->flag);
855 log->flush_tblk = NULL;
856 }
857
858 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk,
859 tblk->flag);
860
861 if (!(tblk->xflag & COMMIT_FORCE))
862 /*
863 * Hand tblk over to lazy commit thread
864 */
865 txLazyUnlock(tblk);
866 else {
867 /* state transition: COMMIT -> COMMITTED */
868 tblk->flag |= tblkGC_COMMITTED;
869
870 if (tblk->flag & tblkGC_READY)
871 log->gcrtc--;
872
873 LOGGC_WAKEUP(tblk);
874 }
875
876 /* was page full before pageout ?
877 * (and this is the last tblk bound with the page)
878 */
879 if (tblk->flag & tblkGC_FREE)
880 lbmFree(bp);
881 /* did page become full after pageout ?
882 * (and this is the last tblk bound with the page)
883 */
884 else if (tblk->flag & tblkGC_EOP) {
885 /* finalize the page */
886 lp = (struct logpage *) bp->l_ldata;
887 bp->l_ceor = bp->l_eor;
888 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
889 jfs_info("lmPostGC: calling lbmWrite");
890 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE,
891 1);
892 }
893
894 }
895
896 /* are there any transactions who have entered lnGroupCommit()
897 * (whose COMMITs are after that of the last log page written.
898 * They are waiting for new group commit (above at (SLEEP 1))
899 * or lazy transactions are on a full (queued) log page,
900 * select the latest ready transaction as new group leader and
901 * wake her up to lead her group.
902 */
903 if ((!list_empty(&log->cqueue)) &&
904 ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) ||
905 test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low))
906 /*
907 * Call lmGCwrite with new group leader
908 */
909 lmGCwrite(log, 1);
910
911 /* no transaction are ready yet (transactions are only just
912 * queued (GC_QUEUE) and not entered for group commit yet).
913 * the first transaction entering group commit
914 * will elect herself as new group leader.
915 */
916 else
917 log->cflag &= ~logGC_PAGEOUT;
918
919 //LOGGC_UNLOCK(log);
920 spin_unlock_irqrestore(&log->gclock, flags);
921 return;
922}
923
924/*
925 * NAME: lmLogSync()
926 *
927 * FUNCTION: write log SYNCPT record for specified log
928 * if new sync address is available
929 * (normally the case if sync() is executed by back-ground
930 * process).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 * calculate new value of i_nextsync which determines when
932 * this code is called again.
933 *
Dave Kleikamp1c627822005-05-02 12:25:08 -0600934 * PARAMETERS: log - log structure
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500935 * hard_sync - 1 to force all metadata to be written
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 *
937 * RETURN: 0
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500938 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 * serialization: LOG_LOCK() held on entry/exit
940 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500941static int lmLogSync(struct jfs_log * log, int hard_sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942{
943 int logsize;
944 int written; /* written since last syncpt */
945 int free; /* free space left available */
946 int delta; /* additional delta to write normally */
947 int more; /* additional write granted */
948 struct lrd lrd;
949 int lsn;
950 struct logsyncblk *lp;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600951 unsigned long flags;
952
953 /* push dirty metapages out to disk */
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500954 if (hard_sync)
Dave Kleikamp67e66822007-10-10 11:11:24 -0500955 write_special_inodes(log, filemap_fdatawrite);
Dave Kleikampcbc3d652005-07-27 09:17:57 -0500956 else
Dave Kleikamp67e66822007-10-10 11:11:24 -0500957 write_special_inodes(log, filemap_flush);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500960 * forward syncpt
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 */
962 /* if last sync is same as last syncpt,
963 * invoke sync point forward processing to update sync.
964 */
965
966 if (log->sync == log->syncpt) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600967 LOGSYNC_LOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 if (list_empty(&log->synclist))
969 log->sync = log->lsn;
970 else {
971 lp = list_entry(log->synclist.next,
972 struct logsyncblk, synclist);
973 log->sync = lp->lsn;
974 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600975 LOGSYNC_UNLOCK(log, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
977 }
978
979 /* if sync is different from last syncpt,
980 * write a SYNCPT record with syncpt = sync.
981 * reset syncpt = sync
982 */
983 if (log->sync != log->syncpt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 lrd.logtid = 0;
985 lrd.backchain = 0;
986 lrd.type = cpu_to_le16(LOG_SYNCPT);
987 lrd.length = 0;
988 lrd.log.syncpt.sync = cpu_to_le32(log->sync);
989 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
990
991 log->syncpt = log->sync;
992 } else
993 lsn = log->lsn;
994
995 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500996 * setup next syncpt trigger (SWAG)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 */
998 logsize = log->logsize;
999
1000 logdiff(written, lsn, log);
1001 free = logsize - written;
1002 delta = LOGSYNC_DELTA(logsize);
1003 more = min(free / 2, delta);
1004 if (more < 2 * LOGPSIZE) {
1005 jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n");
1006 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001007 * log wrapping
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 *
1009 * option 1 - panic ? No.!
1010 * option 2 - shutdown file systems
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001011 * associated with log ?
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 * option 3 - extend log ?
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 * option 4 - second chance
1014 *
1015 * mark log wrapped, and continue.
1016 * when all active transactions are completed,
Nikanth Karthikesan817f2c82010-09-20 11:44:00 +05301017 * mark log valid for recovery.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 * if crashed during invalid state, log state
Nikanth Karthikesan817f2c82010-09-20 11:44:00 +05301019 * implies invalid log, forcing fsck().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 */
1021 /* mark log state log wrap in log superblock */
1022 /* log->state = LOGWRAP; */
1023
1024 /* reset sync point computation */
1025 log->syncpt = log->sync = lsn;
1026 log->nextsync = delta;
1027 } else
1028 /* next syncpt trigger = written + more */
1029 log->nextsync = written + more;
1030
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 /* if number of bytes written from last sync point is more
1032 * than 1/4 of the log size, stop new transactions from
1033 * starting until all current transactions are completed
1034 * by setting syncbarrier flag.
1035 */
Dave Kleikampc2783f32005-07-25 08:58:54 -05001036 if (!test_bit(log_SYNCBARRIER, &log->flag) &&
1037 (written > LOGSYNC_BARRIER(logsize)) && log->active) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 set_bit(log_SYNCBARRIER, &log->flag);
1039 jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn,
1040 log->syncpt);
1041 /*
1042 * We may have to initiate group commit
1043 */
1044 jfs_flush_journal(log, 0);
1045 }
1046
1047 return lsn;
1048}
1049
Dave Kleikamp1c627822005-05-02 12:25:08 -06001050/*
1051 * NAME: jfs_syncpt
1052 *
1053 * FUNCTION: write log SYNCPT record for specified log
1054 *
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001055 * PARAMETERS: log - log structure
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001056 * hard_sync - set to 1 to force metadata to be written
Dave Kleikamp1c627822005-05-02 12:25:08 -06001057 */
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001058void jfs_syncpt(struct jfs_log *log, int hard_sync)
Dave Kleikamp1c627822005-05-02 12:25:08 -06001059{ LOG_LOCK(log);
Dave Kleikampcbc3d652005-07-27 09:17:57 -05001060 lmLogSync(log, hard_sync);
Dave Kleikamp1c627822005-05-02 12:25:08 -06001061 LOG_UNLOCK(log);
1062}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
1064/*
1065 * NAME: lmLogOpen()
1066 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001067 * FUNCTION: open the log on first open;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 * insert filesystem in the active list of the log.
1069 *
1070 * PARAMETER: ipmnt - file system mount inode
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001071 * iplog - log inode (out)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 *
1073 * RETURN:
1074 *
1075 * serialization:
1076 */
1077int lmLogOpen(struct super_block *sb)
1078{
1079 int rc;
1080 struct block_device *bdev;
1081 struct jfs_log *log;
1082 struct jfs_sb_info *sbi = JFS_SBI(sb);
1083
1084 if (sbi->flag & JFS_NOINTEGRITY)
1085 return open_dummy_log(sb);
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 if (sbi->mntflag & JFS_INLINELOG)
1088 return open_inline_log(sb);
1089
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001090 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 list_for_each_entry(log, &jfs_external_logs, journal_list) {
1092 if (log->bdev->bd_dev == sbi->logdev) {
1093 if (memcmp(log->uuid, sbi->loguuid,
1094 sizeof(log->uuid))) {
1095 jfs_warn("wrong uuid on JFS journal\n");
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001096 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 return -EINVAL;
1098 }
1099 /*
1100 * add file system to log active file system list
1101 */
1102 if ((rc = lmLogFileSystem(log, sbi, 1))) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001103 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 return rc;
1105 }
1106 goto journal_found;
1107 }
1108 }
1109
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001110 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001111 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 return -ENOMEM;
1113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 INIT_LIST_HEAD(&log->sb_list);
1115 init_waitqueue_head(&log->syncwait);
1116
1117 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001118 * external log as separate logical volume
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 *
1120 * file systems to log may have n-to-1 relationship;
1121 */
1122
1123 bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE);
1124 if (IS_ERR(bdev)) {
1125 rc = -PTR_ERR(bdev);
1126 goto free;
1127 }
1128
1129 if ((rc = bd_claim(bdev, log))) {
1130 goto close;
1131 }
1132
1133 log->bdev = bdev;
1134 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 /*
1137 * initialize log:
1138 */
1139 if ((rc = lmLogInit(log)))
1140 goto unclaim;
1141
1142 list_add(&log->journal_list, &jfs_external_logs);
1143
1144 /*
1145 * add file system to log active file system list
1146 */
1147 if ((rc = lmLogFileSystem(log, sbi, 1)))
1148 goto shutdown;
1149
1150journal_found:
1151 LOG_LOCK(log);
1152 list_add(&sbi->log_list, &log->sb_list);
1153 sbi->log = log;
1154 LOG_UNLOCK(log);
1155
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001156 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 return 0;
1158
1159 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001160 * unwind on error
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 */
1162 shutdown: /* unwind lbmLogInit() */
1163 list_del(&log->journal_list);
1164 lbmLogShutdown(log);
1165
1166 unclaim:
1167 bd_release(bdev);
1168
1169 close: /* close external log device */
Al Viro9a1c3542008-02-22 20:40:24 -05001170 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171
1172 free: /* free log descriptor */
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001173 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 kfree(log);
1175
1176 jfs_warn("lmLogOpen: exit(%d)", rc);
1177 return rc;
1178}
1179
1180static int open_inline_log(struct super_block *sb)
1181{
1182 struct jfs_log *log;
1183 int rc;
1184
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001185 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 INIT_LIST_HEAD(&log->sb_list);
1188 init_waitqueue_head(&log->syncwait);
1189
1190 set_bit(log_INLINELOG, &log->flag);
1191 log->bdev = sb->s_bdev;
1192 log->base = addressPXD(&JFS_SBI(sb)->logpxd);
1193 log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >>
1194 (L2LOGPSIZE - sb->s_blocksize_bits);
1195 log->l2bsize = sb->s_blocksize_bits;
1196 ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits);
1197
1198 /*
1199 * initialize log.
1200 */
1201 if ((rc = lmLogInit(log))) {
1202 kfree(log);
1203 jfs_warn("lmLogOpen: exit(%d)", rc);
1204 return rc;
1205 }
1206
1207 list_add(&JFS_SBI(sb)->log_list, &log->sb_list);
1208 JFS_SBI(sb)->log = log;
1209
1210 return rc;
1211}
1212
1213static int open_dummy_log(struct super_block *sb)
1214{
1215 int rc;
1216
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001217 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 if (!dummy_log) {
Eric Sesterhenn5b3030e2006-02-23 09:47:13 -06001219 dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 if (!dummy_log) {
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001221 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 return -ENOMEM;
1223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 INIT_LIST_HEAD(&dummy_log->sb_list);
1225 init_waitqueue_head(&dummy_log->syncwait);
1226 dummy_log->no_integrity = 1;
1227 /* Make up some stuff */
1228 dummy_log->base = 0;
1229 dummy_log->size = 1024;
1230 rc = lmLogInit(dummy_log);
1231 if (rc) {
1232 kfree(dummy_log);
1233 dummy_log = NULL;
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001234 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 return rc;
1236 }
1237 }
1238
1239 LOG_LOCK(dummy_log);
1240 list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list);
1241 JFS_SBI(sb)->log = dummy_log;
1242 LOG_UNLOCK(dummy_log);
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001243 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
1245 return 0;
1246}
1247
1248/*
1249 * NAME: lmLogInit()
1250 *
1251 * FUNCTION: log initialization at first log open.
1252 *
1253 * logredo() (or logformat()) should have been run previously.
1254 * initialize the log from log superblock.
1255 * set the log state in the superblock to LOGMOUNT and
1256 * write SYNCPT log record.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001257 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 * PARAMETER: log - log structure
1259 *
1260 * RETURN: 0 - if ok
1261 * -EINVAL - bad log magic number or superblock dirty
1262 * error returned from logwait()
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001263 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 * serialization: single first open thread
1265 */
1266int lmLogInit(struct jfs_log * log)
1267{
1268 int rc = 0;
1269 struct lrd lrd;
1270 struct logsuper *logsuper;
1271 struct lbuf *bpsuper;
1272 struct lbuf *bp;
1273 struct logpage *lp;
1274 int lsn = 0;
1275
1276 jfs_info("lmLogInit: log:0x%p", log);
1277
1278 /* initialize the group commit serialization lock */
1279 LOGGC_LOCK_INIT(log);
1280
1281 /* allocate/initialize the log write serialization lock */
1282 LOG_LOCK_INIT(log);
1283
1284 LOGSYNC_LOCK_INIT(log);
1285
1286 INIT_LIST_HEAD(&log->synclist);
1287
1288 INIT_LIST_HEAD(&log->cqueue);
1289 log->flush_tblk = NULL;
1290
1291 log->count = 0;
1292
1293 /*
1294 * initialize log i/o
1295 */
1296 if ((rc = lbmLogInit(log)))
1297 return rc;
1298
1299 if (!test_bit(log_INLINELOG, &log->flag))
1300 log->l2bsize = L2LOGPSIZE;
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001301
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 /* check for disabled journaling to disk */
1303 if (log->no_integrity) {
1304 /*
1305 * Journal pages will still be filled. When the time comes
1306 * to actually do the I/O, the write is not done, and the
1307 * endio routine is called directly.
1308 */
1309 bp = lbmAllocate(log , 0);
1310 log->bp = bp;
1311 bp->l_pn = bp->l_eor = 0;
1312 } else {
1313 /*
1314 * validate log superblock
1315 */
1316 if ((rc = lbmRead(log, 1, &bpsuper)))
1317 goto errout10;
1318
1319 logsuper = (struct logsuper *) bpsuper->l_ldata;
1320
1321 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) {
1322 jfs_warn("*** Log Format Error ! ***");
1323 rc = -EINVAL;
1324 goto errout20;
1325 }
1326
1327 /* logredo() should have been run successfully. */
1328 if (logsuper->state != cpu_to_le32(LOGREDONE)) {
1329 jfs_warn("*** Log Is Dirty ! ***");
1330 rc = -EINVAL;
1331 goto errout20;
1332 }
1333
1334 /* initialize log from log superblock */
1335 if (test_bit(log_INLINELOG,&log->flag)) {
1336 if (log->size != le32_to_cpu(logsuper->size)) {
1337 rc = -EINVAL;
1338 goto errout20;
1339 }
1340 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx "
1341 "size:0x%x", log,
1342 (unsigned long long) log->base, log->size);
1343 } else {
1344 if (memcmp(logsuper->uuid, log->uuid, 16)) {
1345 jfs_warn("wrong uuid on JFS log device");
1346 goto errout20;
1347 }
1348 log->size = le32_to_cpu(logsuper->size);
1349 log->l2bsize = le32_to_cpu(logsuper->l2bsize);
1350 jfs_info("lmLogInit: external log:0x%p base:0x%Lx "
1351 "size:0x%x", log,
1352 (unsigned long long) log->base, log->size);
1353 }
1354
1355 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE;
1356 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page);
1357
1358 /*
1359 * initialize for log append write mode
1360 */
1361 /* establish current/end-of-log page/buffer */
1362 if ((rc = lbmRead(log, log->page, &bp)))
1363 goto errout20;
1364
1365 lp = (struct logpage *) bp->l_ldata;
1366
1367 jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d",
1368 le32_to_cpu(logsuper->end), log->page, log->eor,
1369 le16_to_cpu(lp->h.eor));
1370
1371 log->bp = bp;
1372 bp->l_pn = log->page;
1373 bp->l_eor = log->eor;
1374
1375 /* if current page is full, move on to next page */
1376 if (log->eor >= LOGPSIZE - LOGPTLRSIZE)
1377 lmNextPage(log);
1378
1379 /*
1380 * initialize log syncpoint
1381 */
1382 /*
1383 * write the first SYNCPT record with syncpoint = 0
1384 * (i.e., log redo up to HERE !);
1385 * remove current page from lbm write queue at end of pageout
1386 * (to write log superblock update), but do not release to
1387 * freelist;
1388 */
1389 lrd.logtid = 0;
1390 lrd.backchain = 0;
1391 lrd.type = cpu_to_le16(LOG_SYNCPT);
1392 lrd.length = 0;
1393 lrd.log.syncpt.sync = 0;
1394 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1395 bp = log->bp;
1396 bp->l_ceor = bp->l_eor;
1397 lp = (struct logpage *) bp->l_ldata;
1398 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1399 lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0);
1400 if ((rc = lbmIOWait(bp, 0)))
1401 goto errout30;
1402
1403 /*
1404 * update/write superblock
1405 */
1406 logsuper->state = cpu_to_le32(LOGMOUNT);
1407 log->serial = le32_to_cpu(logsuper->serial) + 1;
1408 logsuper->serial = cpu_to_le32(log->serial);
1409 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1410 if ((rc = lbmIOWait(bpsuper, lbmFREE)))
1411 goto errout30;
1412 }
1413
1414 /* initialize logsync parameters */
1415 log->logsize = (log->size - 2) << L2LOGPSIZE;
1416 log->lsn = lsn;
1417 log->syncpt = lsn;
1418 log->sync = log->syncpt;
1419 log->nextsync = LOGSYNC_DELTA(log->logsize);
1420
1421 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x",
1422 log->lsn, log->syncpt, log->sync);
1423
1424 /*
1425 * initialize for lazy/group commit
1426 */
1427 log->clsn = lsn;
1428
1429 return 0;
1430
1431 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001432 * unwind on error
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 */
1434 errout30: /* release log page */
1435 log->wqueue = NULL;
1436 bp->l_wqnext = NULL;
1437 lbmFree(bp);
1438
1439 errout20: /* release log superblock */
1440 lbmFree(bpsuper);
1441
1442 errout10: /* unwind lbmLogInit() */
1443 lbmLogShutdown(log);
1444
1445 jfs_warn("lmLogInit: exit(%d)", rc);
1446 return rc;
1447}
1448
1449
1450/*
1451 * NAME: lmLogClose()
1452 *
1453 * FUNCTION: remove file system <ipmnt> from active list of log <iplog>
1454 * and close it on last close.
1455 *
1456 * PARAMETER: sb - superblock
1457 *
1458 * RETURN: errors from subroutines
1459 *
1460 * serialization:
1461 */
1462int lmLogClose(struct super_block *sb)
1463{
1464 struct jfs_sb_info *sbi = JFS_SBI(sb);
1465 struct jfs_log *log = sbi->log;
1466 struct block_device *bdev;
1467 int rc = 0;
1468
1469 jfs_info("lmLogClose: log:0x%p", log);
1470
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001471 mutex_lock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 LOG_LOCK(log);
1473 list_del(&sbi->log_list);
1474 LOG_UNLOCK(log);
1475 sbi->log = NULL;
1476
1477 /*
1478 * We need to make sure all of the "written" metapages
1479 * actually make it to disk
1480 */
1481 sync_blockdev(sb->s_bdev);
1482
1483 if (test_bit(log_INLINELOG, &log->flag)) {
1484 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001485 * in-line log in host file system
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 */
1487 rc = lmLogShutdown(log);
1488 kfree(log);
1489 goto out;
1490 }
1491
1492 if (!log->no_integrity)
1493 lmLogFileSystem(log, sbi, 0);
1494
1495 if (!list_empty(&log->sb_list))
1496 goto out;
1497
1498 /*
1499 * TODO: ensure that the dummy_log is in a state to allow
1500 * lbmLogShutdown to deallocate all the buffers and call
1501 * kfree against dummy_log. For now, leave dummy_log & its
1502 * buffers in memory, and resuse if another no-integrity mount
1503 * is requested.
1504 */
1505 if (log->no_integrity)
1506 goto out;
1507
1508 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001509 * external log as separate logical volume
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 */
1511 list_del(&log->journal_list);
1512 bdev = log->bdev;
1513 rc = lmLogShutdown(log);
1514
1515 bd_release(bdev);
Al Viro9a1c3542008-02-22 20:40:24 -05001516 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
1518 kfree(log);
1519
1520 out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -08001521 mutex_unlock(&jfs_log_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 jfs_info("lmLogClose: exit(%d)", rc);
1523 return rc;
1524}
1525
1526
1527/*
1528 * NAME: jfs_flush_journal()
1529 *
1530 * FUNCTION: initiate write of any outstanding transactions to the journal
1531 * and optionally wait until they are all written to disk
1532 *
1533 * wait == 0 flush until latest txn is committed, don't wait
1534 * wait == 1 flush until latest txn is committed, wait
1535 * wait > 1 flush until all txn's are complete, wait
1536 */
1537void jfs_flush_journal(struct jfs_log *log, int wait)
1538{
1539 int i;
1540 struct tblock *target = NULL;
1541
1542 /* jfs_write_inode may call us during read-only mount */
1543 if (!log)
1544 return;
1545
1546 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait);
1547
1548 LOGGC_LOCK(log);
1549
1550 if (!list_empty(&log->cqueue)) {
1551 /*
1552 * This ensures that we will keep writing to the journal as long
1553 * as there are unwritten commit records
1554 */
1555 target = list_entry(log->cqueue.prev, struct tblock, cqueue);
1556
1557 if (test_bit(log_FLUSH, &log->flag)) {
1558 /*
1559 * We're already flushing.
1560 * if flush_tblk is NULL, we are flushing everything,
1561 * so leave it that way. Otherwise, update it to the
1562 * latest transaction
1563 */
1564 if (log->flush_tblk)
1565 log->flush_tblk = target;
1566 } else {
1567 /* Only flush until latest transaction is committed */
1568 log->flush_tblk = target;
1569 set_bit(log_FLUSH, &log->flag);
1570
1571 /*
1572 * Initiate I/O on outstanding transactions
1573 */
1574 if (!(log->cflag & logGC_PAGEOUT)) {
1575 log->cflag |= logGC_PAGEOUT;
1576 lmGCwrite(log, 0);
1577 }
1578 }
1579 }
1580 if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) {
1581 /* Flush until all activity complete */
1582 set_bit(log_FLUSH, &log->flag);
1583 log->flush_tblk = NULL;
1584 }
1585
1586 if (wait && target && !(target->flag & tblkGC_COMMITTED)) {
1587 DECLARE_WAITQUEUE(__wait, current);
1588
1589 add_wait_queue(&target->gcwait, &__wait);
1590 set_current_state(TASK_UNINTERRUPTIBLE);
1591 LOGGC_UNLOCK(log);
1592 schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05001593 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 LOGGC_LOCK(log);
1595 remove_wait_queue(&target->gcwait, &__wait);
1596 }
1597 LOGGC_UNLOCK(log);
1598
1599 if (wait < 2)
1600 return;
1601
Dave Kleikamp67e66822007-10-10 11:11:24 -05001602 write_special_inodes(log, filemap_fdatawrite);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001603
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 /*
1605 * If there was recent activity, we may need to wait
1606 * for the lazycommit thread to catch up
1607 */
1608 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) {
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001609 for (i = 0; i < 200; i++) { /* Too much? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 msleep(250);
Dave Kleikamp67e66822007-10-10 11:11:24 -05001611 write_special_inodes(log, filemap_fdatawrite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 if (list_empty(&log->cqueue) &&
1613 list_empty(&log->synclist))
1614 break;
1615 }
1616 }
1617 assert(list_empty(&log->cqueue));
Dave Kleikamp72e31482005-06-03 14:09:54 -05001618
1619#ifdef CONFIG_JFS_DEBUG
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001620 if (!list_empty(&log->synclist)) {
1621 struct logsyncblk *lp;
1622
Dave Kleikamp209e1012007-06-06 16:30:17 -05001623 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n");
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001624 list_for_each_entry(lp, &log->synclist, synclist) {
1625 if (lp->xflag & COMMIT_PAGE) {
1626 struct metapage *mp = (struct metapage *)lp;
Dave Kleikamp288e4d82007-06-13 10:17:50 -05001627 print_hex_dump(KERN_ERR, "metapage: ",
1628 DUMP_PREFIX_ADDRESS, 16, 4,
1629 mp, sizeof(struct metapage), 0);
1630 print_hex_dump(KERN_ERR, "page: ",
1631 DUMP_PREFIX_ADDRESS, 16,
1632 sizeof(long), mp->page,
1633 sizeof(struct page), 0);
1634 } else
1635 print_hex_dump(KERN_ERR, "tblock:",
1636 DUMP_PREFIX_ADDRESS, 16, 4,
1637 lp, sizeof(struct tblock), 0);
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001638 }
Dave Kleikamp7fab4792005-05-02 12:25:02 -06001639 }
Dave Kleikamp288e4d82007-06-13 10:17:50 -05001640#else
1641 WARN_ON(!list_empty(&log->synclist));
Dave Kleikamp72e31482005-06-03 14:09:54 -05001642#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 clear_bit(log_FLUSH, &log->flag);
1644}
1645
1646/*
1647 * NAME: lmLogShutdown()
1648 *
1649 * FUNCTION: log shutdown at last LogClose().
1650 *
1651 * write log syncpt record.
1652 * update super block to set redone flag to 0.
1653 *
1654 * PARAMETER: log - log inode
1655 *
1656 * RETURN: 0 - success
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001657 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 * serialization: single last close thread
1659 */
1660int lmLogShutdown(struct jfs_log * log)
1661{
1662 int rc;
1663 struct lrd lrd;
1664 int lsn;
1665 struct logsuper *logsuper;
1666 struct lbuf *bpsuper;
1667 struct lbuf *bp;
1668 struct logpage *lp;
1669
1670 jfs_info("lmLogShutdown: log:0x%p", log);
1671
1672 jfs_flush_journal(log, 2);
1673
1674 /*
1675 * write the last SYNCPT record with syncpoint = 0
1676 * (i.e., log redo up to HERE !)
1677 */
1678 lrd.logtid = 0;
1679 lrd.backchain = 0;
1680 lrd.type = cpu_to_le16(LOG_SYNCPT);
1681 lrd.length = 0;
1682 lrd.log.syncpt.sync = 0;
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001683
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 lsn = lmWriteRecord(log, NULL, &lrd, NULL);
1685 bp = log->bp;
1686 lp = (struct logpage *) bp->l_ldata;
1687 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor);
1688 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0);
1689 lbmIOWait(log->bp, lbmFREE);
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001690 log->bp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691
1692 /*
1693 * synchronous update log superblock
1694 * mark log state as shutdown cleanly
1695 * (i.e., Log does not need to be replayed).
1696 */
1697 if ((rc = lbmRead(log, 1, &bpsuper)))
1698 goto out;
1699
1700 logsuper = (struct logsuper *) bpsuper->l_ldata;
1701 logsuper->state = cpu_to_le32(LOGREDONE);
1702 logsuper->end = cpu_to_le32(lsn);
1703 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1704 rc = lbmIOWait(bpsuper, lbmFREE);
1705
1706 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d",
1707 lsn, log->page, log->eor);
1708
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001709 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 /*
1711 * shutdown per log i/o
1712 */
1713 lbmLogShutdown(log);
1714
1715 if (rc) {
1716 jfs_warn("lmLogShutdown: exit(%d)", rc);
1717 }
1718 return rc;
1719}
1720
1721
1722/*
1723 * NAME: lmLogFileSystem()
1724 *
1725 * FUNCTION: insert (<activate> = true)/remove (<activate> = false)
1726 * file system into/from log active file system list.
1727 *
1728 * PARAMETE: log - pointer to logs inode.
1729 * fsdev - kdev_t of filesystem.
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001730 * serial - pointer to returned log serial number
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 * activate - insert/remove device from active list.
1732 *
1733 * RETURN: 0 - success
1734 * errors returned by vms_iowait().
1735 */
1736static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi,
1737 int activate)
1738{
1739 int rc = 0;
1740 int i;
1741 struct logsuper *logsuper;
1742 struct lbuf *bpsuper;
1743 char *uuid = sbi->uuid;
1744
1745 /*
1746 * insert/remove file system device to log active file system list.
1747 */
1748 if ((rc = lbmRead(log, 1, &bpsuper)))
1749 return rc;
1750
1751 logsuper = (struct logsuper *) bpsuper->l_ldata;
1752 if (activate) {
1753 for (i = 0; i < MAX_ACTIVE; i++)
1754 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) {
1755 memcpy(logsuper->active[i].uuid, uuid, 16);
1756 sbi->aggregate = i;
1757 break;
1758 }
1759 if (i == MAX_ACTIVE) {
1760 jfs_warn("Too many file systems sharing journal!");
1761 lbmFree(bpsuper);
1762 return -EMFILE; /* Is there a better rc? */
1763 }
1764 } else {
1765 for (i = 0; i < MAX_ACTIVE; i++)
1766 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) {
1767 memcpy(logsuper->active[i].uuid, NULL_UUID, 16);
1768 break;
1769 }
1770 if (i == MAX_ACTIVE) {
1771 jfs_warn("Somebody stomped on the journal!");
1772 lbmFree(bpsuper);
1773 return -EIO;
1774 }
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001775
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 }
1777
1778 /*
1779 * synchronous write log superblock:
1780 *
1781 * write sidestream bypassing write queue:
1782 * at file system mount, log super block is updated for
1783 * activation of the file system before any log record
1784 * (MOUNT record) of the file system, and at file system
1785 * unmount, all meta data for the file system has been
1786 * flushed before log super block is updated for deactivation
1787 * of the file system.
1788 */
1789 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC);
1790 rc = lbmIOWait(bpsuper, lbmFREE);
1791
1792 return rc;
1793}
1794
1795/*
1796 * log buffer manager (lbm)
1797 * ------------------------
1798 *
1799 * special purpose buffer manager supporting log i/o requirements.
1800 *
1801 * per log write queue:
1802 * log pageout occurs in serial order by fifo write queue and
1803 * restricting to a single i/o in pregress at any one time.
1804 * a circular singly-linked list
1805 * (log->wrqueue points to the tail, and buffers are linked via
1806 * bp->wrqueue field), and
1807 * maintains log page in pageout ot waiting for pageout in serial pageout.
1808 */
1809
1810/*
1811 * lbmLogInit()
1812 *
1813 * initialize per log I/O setup at lmLogInit()
1814 */
1815static int lbmLogInit(struct jfs_log * log)
1816{ /* log inode */
1817 int i;
1818 struct lbuf *lbuf;
1819
1820 jfs_info("lbmLogInit: log:0x%p", log);
1821
1822 /* initialize current buffer cursor */
1823 log->bp = NULL;
1824
1825 /* initialize log device write queue */
1826 log->wqueue = NULL;
1827
1828 /*
1829 * Each log has its own buffer pages allocated to it. These are
1830 * not managed by the page cache. This ensures that a transaction
1831 * writing to the log does not block trying to allocate a page from
1832 * the page cache (for the log). This would be bad, since page
1833 * allocation waits on the kswapd thread that may be committing inodes
1834 * which would cause log activity. Was that clear? I'm trying to
1835 * avoid deadlock here.
1836 */
1837 init_waitqueue_head(&log->free_wait);
1838
1839 log->lbuf_free = NULL;
1840
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001841 for (i = 0; i < LOGPAGES;) {
1842 char *buffer;
1843 uint offset;
1844 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001846 buffer = (char *) get_zeroed_page(GFP_KERNEL);
1847 if (buffer == NULL)
1848 goto error;
1849 page = virt_to_page(buffer);
1850 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) {
1851 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL);
1852 if (lbuf == NULL) {
1853 if (offset == 0)
1854 free_page((unsigned long) buffer);
1855 goto error;
1856 }
1857 if (offset) /* we already have one reference */
1858 get_page(page);
1859 lbuf->l_offset = offset;
1860 lbuf->l_ldata = buffer + offset;
1861 lbuf->l_page = page;
1862 lbuf->l_log = log;
1863 init_waitqueue_head(&lbuf->l_ioevent);
1864
1865 lbuf->l_freelist = log->lbuf_free;
1866 log->lbuf_free = lbuf;
1867 i++;
1868 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 }
1870
1871 return (0);
1872
1873 error:
1874 lbmLogShutdown(log);
1875 return -ENOMEM;
1876}
1877
1878
1879/*
1880 * lbmLogShutdown()
1881 *
1882 * finalize per log I/O setup at lmLogShutdown()
1883 */
1884static void lbmLogShutdown(struct jfs_log * log)
1885{
1886 struct lbuf *lbuf;
1887
1888 jfs_info("lbmLogShutdown: log:0x%p", log);
1889
1890 lbuf = log->lbuf_free;
1891 while (lbuf) {
1892 struct lbuf *next = lbuf->l_freelist;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06001893 __free_page(lbuf->l_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 kfree(lbuf);
1895 lbuf = next;
1896 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897}
1898
1899
1900/*
1901 * lbmAllocate()
1902 *
1903 * allocate an empty log buffer
1904 */
1905static struct lbuf *lbmAllocate(struct jfs_log * log, int pn)
1906{
1907 struct lbuf *bp;
1908 unsigned long flags;
1909
1910 /*
1911 * recycle from log buffer freelist if any
1912 */
1913 LCACHE_LOCK(flags);
1914 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags);
1915 log->lbuf_free = bp->l_freelist;
1916 LCACHE_UNLOCK(flags);
1917
1918 bp->l_flag = 0;
1919
1920 bp->l_wqnext = NULL;
1921 bp->l_freelist = NULL;
1922
1923 bp->l_pn = pn;
1924 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize));
1925 bp->l_ceor = 0;
1926
1927 return bp;
1928}
1929
1930
1931/*
1932 * lbmFree()
1933 *
1934 * release a log buffer to freelist
1935 */
1936static void lbmFree(struct lbuf * bp)
1937{
1938 unsigned long flags;
1939
1940 LCACHE_LOCK(flags);
1941
1942 lbmfree(bp);
1943
1944 LCACHE_UNLOCK(flags);
1945}
1946
1947static void lbmfree(struct lbuf * bp)
1948{
1949 struct jfs_log *log = bp->l_log;
1950
1951 assert(bp->l_wqnext == NULL);
1952
1953 /*
1954 * return the buffer to head of freelist
1955 */
1956 bp->l_freelist = log->lbuf_free;
1957 log->lbuf_free = bp;
1958
1959 wake_up(&log->free_wait);
1960 return;
1961}
1962
1963
1964/*
1965 * NAME: lbmRedrive
1966 *
Michael Opdenacker59c51592007-05-09 08:57:56 +02001967 * FUNCTION: add a log buffer to the log redrive list
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 *
1969 * PARAMETER:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001970 * bp - log buffer
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 *
1972 * NOTES:
1973 * Takes log_redrive_lock.
1974 */
1975static inline void lbmRedrive(struct lbuf *bp)
1976{
1977 unsigned long flags;
1978
1979 spin_lock_irqsave(&log_redrive_lock, flags);
1980 bp->l_redrive_next = log_redrive_list;
1981 log_redrive_list = bp;
1982 spin_unlock_irqrestore(&log_redrive_lock, flags);
1983
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06001984 wake_up_process(jfsIOthread);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985}
1986
1987
1988/*
1989 * lbmRead()
1990 */
1991static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp)
1992{
1993 struct bio *bio;
1994 struct lbuf *bp;
1995
1996 /*
1997 * allocate a log buffer
1998 */
1999 *bpp = bp = lbmAllocate(log, pn);
2000 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn);
2001
2002 bp->l_flag |= lbmREAD;
2003
2004 bio = bio_alloc(GFP_NOFS, 1);
2005
2006 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2007 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002008 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002010 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
2012 bio->bi_vcnt = 1;
2013 bio->bi_idx = 0;
2014 bio->bi_size = LOGPSIZE;
2015
2016 bio->bi_end_io = lbmIODone;
2017 bio->bi_private = bp;
2018 submit_bio(READ_SYNC, bio);
2019
2020 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD));
2021
2022 return 0;
2023}
2024
2025
2026/*
2027 * lbmWrite()
2028 *
2029 * buffer at head of pageout queue stays after completion of
2030 * partial-page pageout and redriven by explicit initiation of
2031 * pageout by caller until full-page pageout is completed and
2032 * released.
2033 *
2034 * device driver i/o done redrives pageout of new buffer at
2035 * head of pageout queue when current buffer at head of pageout
2036 * queue is released at the completion of its full-page pageout.
2037 *
2038 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit().
2039 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone()
2040 */
2041static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag,
2042 int cant_block)
2043{
2044 struct lbuf *tail;
2045 unsigned long flags;
2046
2047 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn);
2048
2049 /* map the logical block address to physical block address */
2050 bp->l_blkno =
2051 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2052
2053 LCACHE_LOCK(flags); /* disable+lock */
2054
2055 /*
2056 * initialize buffer for device driver
2057 */
2058 bp->l_flag = flag;
2059
2060 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002061 * insert bp at tail of write queue associated with log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 *
2063 * (request is either for bp already/currently at head of queue
2064 * or new bp to be inserted at tail)
2065 */
2066 tail = log->wqueue;
2067
2068 /* is buffer not already on write queue ? */
2069 if (bp->l_wqnext == NULL) {
2070 /* insert at tail of wqueue */
2071 if (tail == NULL) {
2072 log->wqueue = bp;
2073 bp->l_wqnext = bp;
2074 } else {
2075 log->wqueue = bp;
2076 bp->l_wqnext = tail->l_wqnext;
2077 tail->l_wqnext = bp;
2078 }
2079
2080 tail = bp;
2081 }
2082
2083 /* is buffer at head of wqueue and for write ? */
2084 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) {
2085 LCACHE_UNLOCK(flags); /* unlock+enable */
2086 return;
2087 }
2088
2089 LCACHE_UNLOCK(flags); /* unlock+enable */
2090
2091 if (cant_block)
2092 lbmRedrive(bp);
2093 else if (flag & lbmSYNC)
2094 lbmStartIO(bp);
2095 else {
2096 LOGGC_UNLOCK(log);
2097 lbmStartIO(bp);
2098 LOGGC_LOCK(log);
2099 }
2100}
2101
2102
2103/*
2104 * lbmDirectWrite()
2105 *
2106 * initiate pageout bypassing write queue for sidestream
2107 * (e.g., log superblock) write;
2108 */
2109static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag)
2110{
2111 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x",
2112 bp, flag, bp->l_pn);
2113
2114 /*
2115 * initialize buffer for device driver
2116 */
2117 bp->l_flag = flag | lbmDIRECT;
2118
2119 /* map the logical block address to physical block address */
2120 bp->l_blkno =
2121 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize));
2122
2123 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002124 * initiate pageout of the page
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 */
2126 lbmStartIO(bp);
2127}
2128
2129
2130/*
2131 * NAME: lbmStartIO()
2132 *
2133 * FUNCTION: Interface to DD strategy routine
2134 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002135 * RETURN: none
Linus Torvalds1da177e2005-04-16 15:20:36 -07002136 *
2137 * serialization: LCACHE_LOCK() is NOT held during log i/o;
2138 */
2139static void lbmStartIO(struct lbuf * bp)
2140{
2141 struct bio *bio;
2142 struct jfs_log *log = bp->l_log;
2143
2144 jfs_info("lbmStartIO\n");
2145
2146 bio = bio_alloc(GFP_NOFS, 1);
2147 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9);
2148 bio->bi_bdev = log->bdev;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002149 bio->bi_io_vec[0].bv_page = bp->l_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 bio->bi_io_vec[0].bv_len = LOGPSIZE;
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002151 bio->bi_io_vec[0].bv_offset = bp->l_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152
2153 bio->bi_vcnt = 1;
2154 bio->bi_idx = 0;
2155 bio->bi_size = LOGPSIZE;
2156
2157 bio->bi_end_io = lbmIODone;
2158 bio->bi_private = bp;
2159
2160 /* check if journaling to disk has been disabled */
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002161 if (log->no_integrity) {
2162 bio->bi_size = 0;
Jeff Garzike30408b2007-10-12 00:01:21 -04002163 lbmIODone(bio, 0);
Dave Kleikampdc5798d2005-05-02 12:24:57 -06002164 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 submit_bio(WRITE_SYNC, bio);
2166 INCREMENT(lmStat.submitted);
2167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168}
2169
2170
2171/*
2172 * lbmIOWait()
2173 */
2174static int lbmIOWait(struct lbuf * bp, int flag)
2175{
2176 unsigned long flags;
2177 int rc = 0;
2178
2179 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2180
2181 LCACHE_LOCK(flags); /* disable+lock */
2182
2183 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
2184
2185 rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
2186
2187 if (flag & lbmFREE)
2188 lbmfree(bp);
2189
2190 LCACHE_UNLOCK(flags); /* unlock+enable */
2191
2192 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
2193 return rc;
2194}
2195
2196/*
2197 * lbmIODone()
2198 *
2199 * executed at INTIODONE level
2200 */
NeilBrown6712ecf2007-09-27 12:47:43 +02002201static void lbmIODone(struct bio *bio, int error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202{
2203 struct lbuf *bp = bio->bi_private;
2204 struct lbuf *nextbp, *tail;
2205 struct jfs_log *log;
2206 unsigned long flags;
2207
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 /*
2209 * get back jfs buffer bound to the i/o buffer
2210 */
2211 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag);
2212
2213 LCACHE_LOCK(flags); /* disable+lock */
2214
2215 bp->l_flag |= lbmDONE;
2216
2217 if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
2218 bp->l_flag |= lbmERROR;
2219
2220 jfs_err("lbmIODone: I/O error in JFS log");
2221 }
2222
2223 bio_put(bio);
2224
2225 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002226 * pagein completion
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 */
2228 if (bp->l_flag & lbmREAD) {
2229 bp->l_flag &= ~lbmREAD;
2230
2231 LCACHE_UNLOCK(flags); /* unlock+enable */
2232
2233 /* wakeup I/O initiator */
2234 LCACHE_WAKEUP(&bp->l_ioevent);
Dave Kleikamp8d8fe642007-10-13 12:58:00 -05002235
2236 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 }
2238
2239 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002240 * pageout completion
Linus Torvalds1da177e2005-04-16 15:20:36 -07002241 *
2242 * the bp at the head of write queue has completed pageout.
2243 *
2244 * if single-commit/full-page pageout, remove the current buffer
2245 * from head of pageout queue, and redrive pageout with
2246 * the new buffer at head of pageout queue;
2247 * otherwise, the partial-page pageout buffer stays at
2248 * the head of pageout queue to be redriven for pageout
2249 * by lmGroupCommit() until full-page pageout is completed.
2250 */
2251 bp->l_flag &= ~lbmWRITE;
2252 INCREMENT(lmStat.pagedone);
2253
2254 /* update committed lsn */
2255 log = bp->l_log;
2256 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor;
2257
2258 if (bp->l_flag & lbmDIRECT) {
2259 LCACHE_WAKEUP(&bp->l_ioevent);
2260 LCACHE_UNLOCK(flags);
Dave Kleikamp8d8fe642007-10-13 12:58:00 -05002261 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 }
2263
2264 tail = log->wqueue;
2265
2266 /* single element queue */
2267 if (bp == tail) {
2268 /* remove head buffer of full-page pageout
2269 * from log device write queue
2270 */
2271 if (bp->l_flag & lbmRELEASE) {
2272 log->wqueue = NULL;
2273 bp->l_wqnext = NULL;
2274 }
2275 }
2276 /* multi element queue */
2277 else {
2278 /* remove head buffer of full-page pageout
2279 * from log device write queue
2280 */
2281 if (bp->l_flag & lbmRELEASE) {
2282 nextbp = tail->l_wqnext = bp->l_wqnext;
2283 bp->l_wqnext = NULL;
2284
2285 /*
2286 * redrive pageout of next page at head of write queue:
2287 * redrive next page without any bound tblk
2288 * (i.e., page w/o any COMMIT records), or
2289 * first page of new group commit which has been
2290 * queued after current page (subsequent pageout
2291 * is performed synchronously, except page without
2292 * any COMMITs) by lmGroupCommit() as indicated
2293 * by lbmWRITE flag;
2294 */
2295 if (nextbp->l_flag & lbmWRITE) {
2296 /*
2297 * We can't do the I/O at interrupt time.
2298 * The jfsIO thread can do it
2299 */
2300 lbmRedrive(nextbp);
2301 }
2302 }
2303 }
2304
2305 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002306 * synchronous pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 *
2308 * buffer has not necessarily been removed from write queue
2309 * (e.g., synchronous write of partial-page with COMMIT):
2310 * leave buffer for i/o initiator to dispose
2311 */
2312 if (bp->l_flag & lbmSYNC) {
2313 LCACHE_UNLOCK(flags); /* unlock+enable */
2314
2315 /* wakeup I/O initiator */
2316 LCACHE_WAKEUP(&bp->l_ioevent);
2317 }
2318
2319 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002320 * Group Commit pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 */
2322 else if (bp->l_flag & lbmGC) {
2323 LCACHE_UNLOCK(flags);
2324 lmPostGC(bp);
2325 }
2326
2327 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002328 * asynchronous pageout:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 *
2330 * buffer must have been removed from write queue:
2331 * insert buffer at head of freelist where it can be recycled
2332 */
2333 else {
2334 assert(bp->l_flag & lbmRELEASE);
2335 assert(bp->l_flag & lbmFREE);
2336 lbmfree(bp);
2337
2338 LCACHE_UNLOCK(flags); /* unlock+enable */
2339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340}
2341
2342int jfsIOWait(void *arg)
2343{
2344 struct lbuf *bp;
2345
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002347 spin_lock_irq(&log_redrive_lock);
Joe Perches09aaa742007-11-13 22:16:08 -06002348 while ((bp = log_redrive_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002349 log_redrive_list = bp->l_redrive_next;
2350 bp->l_redrive_next = NULL;
2351 spin_unlock_irq(&log_redrive_lock);
2352 lbmStartIO(bp);
2353 spin_lock_irq(&log_redrive_lock);
2354 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002355
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002356 if (freezing(current)) {
Dave Kleikamp05ec9e22007-05-05 14:24:05 -05002357 spin_unlock_irq(&log_redrive_lock);
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07002358 refrigerator();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 set_current_state(TASK_INTERRUPTIBLE);
Dave Kleikamp05ec9e22007-05-05 14:24:05 -05002361 spin_unlock_irq(&log_redrive_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 schedule();
Milind Arun Choudhary3cbb1c82007-04-26 07:30:29 -05002363 __set_current_state(TASK_RUNNING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 }
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002365 } while (!kthread_should_stop());
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366
2367 jfs_info("jfsIOWait being killed!");
Christoph Hellwig91dbb4d2006-02-15 12:49:04 -06002368 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369}
2370
2371/*
2372 * NAME: lmLogFormat()/jfs_logform()
2373 *
2374 * FUNCTION: format file system log
2375 *
2376 * PARAMETERS:
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002377 * log - volume log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 * logAddress - start address of log space in FS block
2379 * logSize - length of log space in FS block;
2380 *
2381 * RETURN: 0 - success
2382 * -EIO - i/o error
2383 *
2384 * XXX: We're synchronously writing one page at a time. This needs to
2385 * be improved by writing multiple pages at once.
2386 */
2387int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize)
2388{
2389 int rc = -EIO;
2390 struct jfs_sb_info *sbi;
2391 struct logsuper *logsuper;
2392 struct logpage *lp;
2393 int lspn; /* log sequence page number */
2394 struct lrd *lrd_ptr;
2395 int npages = 0;
2396 struct lbuf *bp;
2397
2398 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d",
2399 (long long)logAddress, logSize);
2400
2401 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list);
2402
2403 /* allocate a log buffer */
2404 bp = lbmAllocate(log, 1);
2405
2406 npages = logSize >> sbi->l2nbperpage;
2407
2408 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002409 * log space:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410 *
2411 * page 0 - reserved;
2412 * page 1 - log superblock;
2413 * page 2 - log data page: A SYNC log record is written
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002414 * into this page at logform time;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415 * pages 3-N - log data page: set to empty log data pages;
2416 */
2417 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002418 * init log superblock: log page 1
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 */
2420 logsuper = (struct logsuper *) bp->l_ldata;
2421
2422 logsuper->magic = cpu_to_le32(LOGMAGIC);
2423 logsuper->version = cpu_to_le32(LOGVERSION);
2424 logsuper->state = cpu_to_le32(LOGREDONE);
2425 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */
2426 logsuper->size = cpu_to_le32(npages);
2427 logsuper->bsize = cpu_to_le32(sbi->bsize);
2428 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize);
2429 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE);
2430
2431 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2432 bp->l_blkno = logAddress + sbi->nbperpage;
2433 lbmStartIO(bp);
2434 if ((rc = lbmIOWait(bp, 0)))
2435 goto exit;
2436
2437 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002438 * init pages 2 to npages-1 as log data pages:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002439 *
2440 * log page sequence number (lpsn) initialization:
2441 *
2442 * pn: 0 1 2 3 n-1
2443 * +-----+-----+=====+=====+===.....===+=====+
2444 * lspn: N-1 0 1 N-2
2445 * <--- N page circular file ---->
2446 *
2447 * the N (= npages-2) data pages of the log is maintained as
2448 * a circular file for the log records;
2449 * lpsn grows by 1 monotonically as each log page is written
2450 * to the circular file of the log;
2451 * and setLogpage() will not reset the page number even if
2452 * the eor is equal to LOGPHDRSIZE. In order for binary search
2453 * still work in find log end process, we have to simulate the
2454 * log wrap situation at the log format time.
2455 * The 1st log page written will have the highest lpsn. Then
2456 * the succeeding log pages will have ascending order of
2457 * the lspn starting from 0, ... (N-2)
2458 */
2459 lp = (struct logpage *) bp->l_ldata;
2460 /*
2461 * initialize 1st log page to be written: lpsn = N - 1,
2462 * write a SYNCPT log record is written to this page
2463 */
2464 lp->h.page = lp->t.page = cpu_to_le32(npages - 3);
2465 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE);
2466
2467 lrd_ptr = (struct lrd *) &lp->data;
2468 lrd_ptr->logtid = 0;
2469 lrd_ptr->backchain = 0;
2470 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT);
2471 lrd_ptr->length = 0;
2472 lrd_ptr->log.syncpt.sync = 0;
2473
2474 bp->l_blkno += sbi->nbperpage;
2475 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2476 lbmStartIO(bp);
2477 if ((rc = lbmIOWait(bp, 0)))
2478 goto exit;
2479
2480 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002481 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 */
2483 for (lspn = 0; lspn < npages - 3; lspn++) {
2484 lp->h.page = lp->t.page = cpu_to_le32(lspn);
2485 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE);
2486
2487 bp->l_blkno += sbi->nbperpage;
2488 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT;
2489 lbmStartIO(bp);
2490 if ((rc = lbmIOWait(bp, 0)))
2491 goto exit;
2492 }
2493
2494 rc = 0;
2495exit:
2496 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05002497 * finalize log
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 */
2499 /* release the buffer */
2500 lbmFree(bp);
2501
2502 return rc;
2503}
2504
2505#ifdef CONFIG_JFS_STATISTICS
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002506static int jfs_lmstats_proc_show(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002507{
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002508 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 "JFS Logmgr stats\n"
2510 "================\n"
2511 "commits = %d\n"
2512 "writes submitted = %d\n"
2513 "writes completed = %d\n"
2514 "full pages submitted = %d\n"
2515 "partial pages submitted = %d\n",
2516 lmStat.commit,
2517 lmStat.submitted,
2518 lmStat.pagedone,
2519 lmStat.full_page,
2520 lmStat.partial_page);
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002521 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522}
Alexey Dobriyanb2e03ca2008-05-13 08:22:10 -05002523
2524static int jfs_lmstats_proc_open(struct inode *inode, struct file *file)
2525{
2526 return single_open(file, jfs_lmstats_proc_show, NULL);
2527}
2528
2529const struct file_operations jfs_lmstats_proc_fops = {
2530 .owner = THIS_MODULE,
2531 .open = jfs_lmstats_proc_open,
2532 .read = seq_read,
2533 .llseek = seq_lseek,
2534 .release = single_release,
2535};
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536#endif /* CONFIG_JFS_STATISTICS */