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1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
13 | * the GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | |
20 | /* |
21 | * jfs_logmgr.c: log manager |
22 | * |
23 | * for related information, see transaction manager (jfs_txnmgr.c), and |
24 | * recovery manager (jfs_logredo.c). |
25 | * |
26 | * note: for detail, RTFS. |
27 | * |
28 | * log buffer manager: |
29 | * special purpose buffer manager supporting log i/o requirements. |
30 | * per log serial pageout of logpage |
31 | * queuing i/o requests and redrive i/o at iodone |
32 | * maintain current logpage buffer |
33 | * no caching since append only |
34 | * appropriate jfs buffer cache buffers as needed |
35 | * |
36 | * group commit: |
37 | * transactions which wrote COMMIT records in the same in-memory |
38 | * log page during the pageout of previous/current log page(s) are |
39 | * committed together by the pageout of the page. |
40 | * |
41 | * TBD lazy commit: |
42 | * transactions are committed asynchronously when the log page |
43 | * containing it COMMIT is paged out when it becomes full; |
44 | * |
45 | * serialization: |
46 | * . a per log lock serialize log write. |
47 | * . a per log lock serialize group commit. |
48 | * . a per log lock serialize log open/close; |
49 | * |
50 | * TBD log integrity: |
51 | * careful-write (ping-pong) of last logpage to recover from crash |
52 | * in overwrite. |
53 | * detection of split (out-of-order) write of physical sectors |
54 | * of last logpage via timestamp at end of each sector |
55 | * with its mirror data array at trailer). |
56 | * |
57 | * alternatives: |
58 | * lsn - 64-bit monotonically increasing integer vs |
59 | * 32-bit lspn and page eor. |
60 | */ |
61 | |
62 | #include <linux/fs.h> |
63 | #include <linux/blkdev.h> |
64 | #include <linux/interrupt.h> |
65 | #include <linux/completion.h> |
66 | #include <linux/kthread.h> |
67 | #include <linux/buffer_head.h> /* for sync_blockdev() */ |
68 | #include <linux/bio.h> |
69 | #include <linux/freezer.h> |
70 | #include <linux/delay.h> |
71 | #include <linux/mutex.h> |
72 | #include <linux/seq_file.h> |
73 | #include <linux/slab.h> |
74 | #include "jfs_incore.h" |
75 | #include "jfs_filsys.h" |
76 | #include "jfs_metapage.h" |
77 | #include "jfs_superblock.h" |
78 | #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 | */ |
85 | static struct lbuf *log_redrive_list; |
86 | static DEFINE_SPINLOCK(log_redrive_lock); |
87 | |
88 | |
89 | /* |
90 | * log read/write serialization (per log) |
91 | */ |
92 | #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)) |
95 | |
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 | */ |
120 | static 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) \ |
129 | do { \ |
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 | */ |
168 | static LIST_HEAD(jfs_external_logs); |
169 | static struct jfs_log *dummy_log = NULL; |
170 | static DEFINE_MUTEX(jfs_log_mutex); |
171 | |
172 | /* |
173 | * forward references |
174 | */ |
175 | static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, |
176 | struct lrd * lrd, struct tlock * tlck); |
177 | |
178 | static int lmNextPage(struct jfs_log * log); |
179 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, |
180 | int activate); |
181 | |
182 | static int open_inline_log(struct super_block *sb); |
183 | static int open_dummy_log(struct super_block *sb); |
184 | static int lbmLogInit(struct jfs_log * log); |
185 | static void lbmLogShutdown(struct jfs_log * log); |
186 | static struct lbuf *lbmAllocate(struct jfs_log * log, int); |
187 | static void lbmFree(struct lbuf * bp); |
188 | static void lbmfree(struct lbuf * bp); |
189 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); |
190 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); |
191 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); |
192 | static int lbmIOWait(struct lbuf * bp, int flag); |
193 | static bio_end_io_t lbmIODone; |
194 | static void lbmStartIO(struct lbuf * bp); |
195 | static void lmGCwrite(struct jfs_log * log, int cant_block); |
196 | static int lmLogSync(struct jfs_log * log, int hard_sync); |
197 | |
198 | |
199 | |
200 | /* |
201 | * statistics |
202 | */ |
203 | #ifdef CONFIG_JFS_STATISTICS |
204 | static 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 | |
213 | static 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 | } |
224 | |
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 | */ |
237 | int 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; |
243 | unsigned long flags; |
244 | |
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 | /* |
260 | * initialize/update page/transaction recovery lsn |
261 | */ |
262 | lsn = log->lsn; |
263 | |
264 | LOGSYNC_LOCK(log, flags); |
265 | |
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 | /* |
279 | * initialize/update lsn of tblock of the page |
280 | * |
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 | |
320 | LOGSYNC_UNLOCK(log, flags); |
321 | |
322 | /* |
323 | * write the log record |
324 | */ |
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 | |
344 | /* |
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 |
352 | * |
353 | * serialization: LOG_LOCK() held on entry/exit |
354 | */ |
355 | static int |
356 | lmWriteRecord(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 | /* |
388 | * move log record data |
389 | */ |
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 | /* |
481 | * move log record descriptor |
482 | */ |
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 |
569 | * |
570 | * serialization: LOG_LOCK() held on entry/exit |
571 | */ |
572 | static 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 | /* |
590 | * write or queue the full page at the tail of write queue |
591 | */ |
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 | /* |
641 | * allocate/initialize next page |
642 | */ |
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 | * |
671 | * RETURN: |
672 | * |
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 | */ |
678 | int 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 | */ |
757 | static 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 | */ |
822 | static 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). |
931 | * calculate new value of i_nextsync which determines when |
932 | * this code is called again. |
933 | * |
934 | * PARAMETERS: log - log structure |
935 | * hard_sync - 1 to force all metadata to be written |
936 | * |
937 | * RETURN: 0 |
938 | * |
939 | * serialization: LOG_LOCK() held on entry/exit |
940 | */ |
941 | static int lmLogSync(struct jfs_log * log, int hard_sync) |
942 | { |
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; |
951 | unsigned long flags; |
952 | |
953 | /* push dirty metapages out to disk */ |
954 | if (hard_sync) |
955 | write_special_inodes(log, filemap_fdatawrite); |
956 | else |
957 | write_special_inodes(log, filemap_flush); |
958 | |
959 | /* |
960 | * forward syncpt |
961 | */ |
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) { |
967 | LOGSYNC_LOCK(log, flags); |
968 | 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 | } |
975 | LOGSYNC_UNLOCK(log, flags); |
976 | |
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) { |
984 | 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 | /* |
996 | * setup next syncpt trigger (SWAG) |
997 | */ |
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 | /* |
1007 | * log wrapping |
1008 | * |
1009 | * option 1 - panic ? No.! |
1010 | * option 2 - shutdown file systems |
1011 | * associated with log ? |
1012 | * option 3 - extend log ? |
1013 | */ |
1014 | /* |
1015 | * option 4 - second chance |
1016 | * |
1017 | * mark log wrapped, and continue. |
1018 | * when all active transactions are completed, |
1019 | * mark log vaild for recovery. |
1020 | * if crashed during invalid state, log state |
1021 | * implies invald log, forcing fsck(). |
1022 | */ |
1023 | /* mark log state log wrap in log superblock */ |
1024 | /* log->state = LOGWRAP; */ |
1025 | |
1026 | /* reset sync point computation */ |
1027 | log->syncpt = log->sync = lsn; |
1028 | log->nextsync = delta; |
1029 | } else |
1030 | /* next syncpt trigger = written + more */ |
1031 | log->nextsync = written + more; |
1032 | |
1033 | /* if number of bytes written from last sync point is more |
1034 | * than 1/4 of the log size, stop new transactions from |
1035 | * starting until all current transactions are completed |
1036 | * by setting syncbarrier flag. |
1037 | */ |
1038 | if (!test_bit(log_SYNCBARRIER, &log->flag) && |
1039 | (written > LOGSYNC_BARRIER(logsize)) && log->active) { |
1040 | set_bit(log_SYNCBARRIER, &log->flag); |
1041 | jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, |
1042 | log->syncpt); |
1043 | /* |
1044 | * We may have to initiate group commit |
1045 | */ |
1046 | jfs_flush_journal(log, 0); |
1047 | } |
1048 | |
1049 | return lsn; |
1050 | } |
1051 | |
1052 | /* |
1053 | * NAME: jfs_syncpt |
1054 | * |
1055 | * FUNCTION: write log SYNCPT record for specified log |
1056 | * |
1057 | * PARAMETERS: log - log structure |
1058 | * hard_sync - set to 1 to force metadata to be written |
1059 | */ |
1060 | void jfs_syncpt(struct jfs_log *log, int hard_sync) |
1061 | { LOG_LOCK(log); |
1062 | lmLogSync(log, hard_sync); |
1063 | LOG_UNLOCK(log); |
1064 | } |
1065 | |
1066 | /* |
1067 | * NAME: lmLogOpen() |
1068 | * |
1069 | * FUNCTION: open the log on first open; |
1070 | * insert filesystem in the active list of the log. |
1071 | * |
1072 | * PARAMETER: ipmnt - file system mount inode |
1073 | * iplog - log inode (out) |
1074 | * |
1075 | * RETURN: |
1076 | * |
1077 | * serialization: |
1078 | */ |
1079 | int lmLogOpen(struct super_block *sb) |
1080 | { |
1081 | int rc; |
1082 | struct block_device *bdev; |
1083 | struct jfs_log *log; |
1084 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
1085 | |
1086 | if (sbi->flag & JFS_NOINTEGRITY) |
1087 | return open_dummy_log(sb); |
1088 | |
1089 | if (sbi->mntflag & JFS_INLINELOG) |
1090 | return open_inline_log(sb); |
1091 | |
1092 | mutex_lock(&jfs_log_mutex); |
1093 | list_for_each_entry(log, &jfs_external_logs, journal_list) { |
1094 | if (log->bdev->bd_dev == sbi->logdev) { |
1095 | if (memcmp(log->uuid, sbi->loguuid, |
1096 | sizeof(log->uuid))) { |
1097 | jfs_warn("wrong uuid on JFS journal\n"); |
1098 | mutex_unlock(&jfs_log_mutex); |
1099 | return -EINVAL; |
1100 | } |
1101 | /* |
1102 | * add file system to log active file system list |
1103 | */ |
1104 | if ((rc = lmLogFileSystem(log, sbi, 1))) { |
1105 | mutex_unlock(&jfs_log_mutex); |
1106 | return rc; |
1107 | } |
1108 | goto journal_found; |
1109 | } |
1110 | } |
1111 | |
1112 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
1113 | mutex_unlock(&jfs_log_mutex); |
1114 | return -ENOMEM; |
1115 | } |
1116 | INIT_LIST_HEAD(&log->sb_list); |
1117 | init_waitqueue_head(&log->syncwait); |
1118 | |
1119 | /* |
1120 | * external log as separate logical volume |
1121 | * |
1122 | * file systems to log may have n-to-1 relationship; |
1123 | */ |
1124 | |
1125 | bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE); |
1126 | if (IS_ERR(bdev)) { |
1127 | rc = -PTR_ERR(bdev); |
1128 | goto free; |
1129 | } |
1130 | |
1131 | if ((rc = bd_claim(bdev, log))) { |
1132 | goto close; |
1133 | } |
1134 | |
1135 | log->bdev = bdev; |
1136 | memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); |
1137 | |
1138 | /* |
1139 | * initialize log: |
1140 | */ |
1141 | if ((rc = lmLogInit(log))) |
1142 | goto unclaim; |
1143 | |
1144 | list_add(&log->journal_list, &jfs_external_logs); |
1145 | |
1146 | /* |
1147 | * add file system to log active file system list |
1148 | */ |
1149 | if ((rc = lmLogFileSystem(log, sbi, 1))) |
1150 | goto shutdown; |
1151 | |
1152 | journal_found: |
1153 | LOG_LOCK(log); |
1154 | list_add(&sbi->log_list, &log->sb_list); |
1155 | sbi->log = log; |
1156 | LOG_UNLOCK(log); |
1157 | |
1158 | mutex_unlock(&jfs_log_mutex); |
1159 | return 0; |
1160 | |
1161 | /* |
1162 | * unwind on error |
1163 | */ |
1164 | shutdown: /* unwind lbmLogInit() */ |
1165 | list_del(&log->journal_list); |
1166 | lbmLogShutdown(log); |
1167 | |
1168 | unclaim: |
1169 | bd_release(bdev); |
1170 | |
1171 | close: /* close external log device */ |
1172 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1173 | |
1174 | free: /* free log descriptor */ |
1175 | mutex_unlock(&jfs_log_mutex); |
1176 | kfree(log); |
1177 | |
1178 | jfs_warn("lmLogOpen: exit(%d)", rc); |
1179 | return rc; |
1180 | } |
1181 | |
1182 | static int open_inline_log(struct super_block *sb) |
1183 | { |
1184 | struct jfs_log *log; |
1185 | int rc; |
1186 | |
1187 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
1188 | return -ENOMEM; |
1189 | INIT_LIST_HEAD(&log->sb_list); |
1190 | init_waitqueue_head(&log->syncwait); |
1191 | |
1192 | set_bit(log_INLINELOG, &log->flag); |
1193 | log->bdev = sb->s_bdev; |
1194 | log->base = addressPXD(&JFS_SBI(sb)->logpxd); |
1195 | log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> |
1196 | (L2LOGPSIZE - sb->s_blocksize_bits); |
1197 | log->l2bsize = sb->s_blocksize_bits; |
1198 | ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); |
1199 | |
1200 | /* |
1201 | * initialize log. |
1202 | */ |
1203 | if ((rc = lmLogInit(log))) { |
1204 | kfree(log); |
1205 | jfs_warn("lmLogOpen: exit(%d)", rc); |
1206 | return rc; |
1207 | } |
1208 | |
1209 | list_add(&JFS_SBI(sb)->log_list, &log->sb_list); |
1210 | JFS_SBI(sb)->log = log; |
1211 | |
1212 | return rc; |
1213 | } |
1214 | |
1215 | static int open_dummy_log(struct super_block *sb) |
1216 | { |
1217 | int rc; |
1218 | |
1219 | mutex_lock(&jfs_log_mutex); |
1220 | if (!dummy_log) { |
1221 | dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
1222 | if (!dummy_log) { |
1223 | mutex_unlock(&jfs_log_mutex); |
1224 | return -ENOMEM; |
1225 | } |
1226 | INIT_LIST_HEAD(&dummy_log->sb_list); |
1227 | init_waitqueue_head(&dummy_log->syncwait); |
1228 | dummy_log->no_integrity = 1; |
1229 | /* Make up some stuff */ |
1230 | dummy_log->base = 0; |
1231 | dummy_log->size = 1024; |
1232 | rc = lmLogInit(dummy_log); |
1233 | if (rc) { |
1234 | kfree(dummy_log); |
1235 | dummy_log = NULL; |
1236 | mutex_unlock(&jfs_log_mutex); |
1237 | return rc; |
1238 | } |
1239 | } |
1240 | |
1241 | LOG_LOCK(dummy_log); |
1242 | list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); |
1243 | JFS_SBI(sb)->log = dummy_log; |
1244 | LOG_UNLOCK(dummy_log); |
1245 | mutex_unlock(&jfs_log_mutex); |
1246 | |
1247 | return 0; |
1248 | } |
1249 | |
1250 | /* |
1251 | * NAME: lmLogInit() |
1252 | * |
1253 | * FUNCTION: log initialization at first log open. |
1254 | * |
1255 | * logredo() (or logformat()) should have been run previously. |
1256 | * initialize the log from log superblock. |
1257 | * set the log state in the superblock to LOGMOUNT and |
1258 | * write SYNCPT log record. |
1259 | * |
1260 | * PARAMETER: log - log structure |
1261 | * |
1262 | * RETURN: 0 - if ok |
1263 | * -EINVAL - bad log magic number or superblock dirty |
1264 | * error returned from logwait() |
1265 | * |
1266 | * serialization: single first open thread |
1267 | */ |
1268 | int lmLogInit(struct jfs_log * log) |
1269 | { |
1270 | int rc = 0; |
1271 | struct lrd lrd; |
1272 | struct logsuper *logsuper; |
1273 | struct lbuf *bpsuper; |
1274 | struct lbuf *bp; |
1275 | struct logpage *lp; |
1276 | int lsn = 0; |
1277 | |
1278 | jfs_info("lmLogInit: log:0x%p", log); |
1279 | |
1280 | /* initialize the group commit serialization lock */ |
1281 | LOGGC_LOCK_INIT(log); |
1282 | |
1283 | /* allocate/initialize the log write serialization lock */ |
1284 | LOG_LOCK_INIT(log); |
1285 | |
1286 | LOGSYNC_LOCK_INIT(log); |
1287 | |
1288 | INIT_LIST_HEAD(&log->synclist); |
1289 | |
1290 | INIT_LIST_HEAD(&log->cqueue); |
1291 | log->flush_tblk = NULL; |
1292 | |
1293 | log->count = 0; |
1294 | |
1295 | /* |
1296 | * initialize log i/o |
1297 | */ |
1298 | if ((rc = lbmLogInit(log))) |
1299 | return rc; |
1300 | |
1301 | if (!test_bit(log_INLINELOG, &log->flag)) |
1302 | log->l2bsize = L2LOGPSIZE; |
1303 | |
1304 | /* check for disabled journaling to disk */ |
1305 | if (log->no_integrity) { |
1306 | /* |
1307 | * Journal pages will still be filled. When the time comes |
1308 | * to actually do the I/O, the write is not done, and the |
1309 | * endio routine is called directly. |
1310 | */ |
1311 | bp = lbmAllocate(log , 0); |
1312 | log->bp = bp; |
1313 | bp->l_pn = bp->l_eor = 0; |
1314 | } else { |
1315 | /* |
1316 | * validate log superblock |
1317 | */ |
1318 | if ((rc = lbmRead(log, 1, &bpsuper))) |
1319 | goto errout10; |
1320 | |
1321 | logsuper = (struct logsuper *) bpsuper->l_ldata; |
1322 | |
1323 | if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { |
1324 | jfs_warn("*** Log Format Error ! ***"); |
1325 | rc = -EINVAL; |
1326 | goto errout20; |
1327 | } |
1328 | |
1329 | /* logredo() should have been run successfully. */ |
1330 | if (logsuper->state != cpu_to_le32(LOGREDONE)) { |
1331 | jfs_warn("*** Log Is Dirty ! ***"); |
1332 | rc = -EINVAL; |
1333 | goto errout20; |
1334 | } |
1335 | |
1336 | /* initialize log from log superblock */ |
1337 | if (test_bit(log_INLINELOG,&log->flag)) { |
1338 | if (log->size != le32_to_cpu(logsuper->size)) { |
1339 | rc = -EINVAL; |
1340 | goto errout20; |
1341 | } |
1342 | jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " |
1343 | "size:0x%x", log, |
1344 | (unsigned long long) log->base, log->size); |
1345 | } else { |
1346 | if (memcmp(logsuper->uuid, log->uuid, 16)) { |
1347 | jfs_warn("wrong uuid on JFS log device"); |
1348 | goto errout20; |
1349 | } |
1350 | log->size = le32_to_cpu(logsuper->size); |
1351 | log->l2bsize = le32_to_cpu(logsuper->l2bsize); |
1352 | jfs_info("lmLogInit: external log:0x%p base:0x%Lx " |
1353 | "size:0x%x", log, |
1354 | (unsigned long long) log->base, log->size); |
1355 | } |
1356 | |
1357 | log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; |
1358 | log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); |
1359 | |
1360 | /* |
1361 | * initialize for log append write mode |
1362 | */ |
1363 | /* establish current/end-of-log page/buffer */ |
1364 | if ((rc = lbmRead(log, log->page, &bp))) |
1365 | goto errout20; |
1366 | |
1367 | lp = (struct logpage *) bp->l_ldata; |
1368 | |
1369 | jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", |
1370 | le32_to_cpu(logsuper->end), log->page, log->eor, |
1371 | le16_to_cpu(lp->h.eor)); |
1372 | |
1373 | log->bp = bp; |
1374 | bp->l_pn = log->page; |
1375 | bp->l_eor = log->eor; |
1376 | |
1377 | /* if current page is full, move on to next page */ |
1378 | if (log->eor >= LOGPSIZE - LOGPTLRSIZE) |
1379 | lmNextPage(log); |
1380 | |
1381 | /* |
1382 | * initialize log syncpoint |
1383 | */ |
1384 | /* |
1385 | * write the first SYNCPT record with syncpoint = 0 |
1386 | * (i.e., log redo up to HERE !); |
1387 | * remove current page from lbm write queue at end of pageout |
1388 | * (to write log superblock update), but do not release to |
1389 | * freelist; |
1390 | */ |
1391 | lrd.logtid = 0; |
1392 | lrd.backchain = 0; |
1393 | lrd.type = cpu_to_le16(LOG_SYNCPT); |
1394 | lrd.length = 0; |
1395 | lrd.log.syncpt.sync = 0; |
1396 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
1397 | bp = log->bp; |
1398 | bp->l_ceor = bp->l_eor; |
1399 | lp = (struct logpage *) bp->l_ldata; |
1400 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); |
1401 | lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); |
1402 | if ((rc = lbmIOWait(bp, 0))) |
1403 | goto errout30; |
1404 | |
1405 | /* |
1406 | * update/write superblock |
1407 | */ |
1408 | logsuper->state = cpu_to_le32(LOGMOUNT); |
1409 | log->serial = le32_to_cpu(logsuper->serial) + 1; |
1410 | logsuper->serial = cpu_to_le32(log->serial); |
1411 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
1412 | if ((rc = lbmIOWait(bpsuper, lbmFREE))) |
1413 | goto errout30; |
1414 | } |
1415 | |
1416 | /* initialize logsync parameters */ |
1417 | log->logsize = (log->size - 2) << L2LOGPSIZE; |
1418 | log->lsn = lsn; |
1419 | log->syncpt = lsn; |
1420 | log->sync = log->syncpt; |
1421 | log->nextsync = LOGSYNC_DELTA(log->logsize); |
1422 | |
1423 | jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", |
1424 | log->lsn, log->syncpt, log->sync); |
1425 | |
1426 | /* |
1427 | * initialize for lazy/group commit |
1428 | */ |
1429 | log->clsn = lsn; |
1430 | |
1431 | return 0; |
1432 | |
1433 | /* |
1434 | * unwind on error |
1435 | */ |
1436 | errout30: /* release log page */ |
1437 | log->wqueue = NULL; |
1438 | bp->l_wqnext = NULL; |
1439 | lbmFree(bp); |
1440 | |
1441 | errout20: /* release log superblock */ |
1442 | lbmFree(bpsuper); |
1443 | |
1444 | errout10: /* unwind lbmLogInit() */ |
1445 | lbmLogShutdown(log); |
1446 | |
1447 | jfs_warn("lmLogInit: exit(%d)", rc); |
1448 | return rc; |
1449 | } |
1450 | |
1451 | |
1452 | /* |
1453 | * NAME: lmLogClose() |
1454 | * |
1455 | * FUNCTION: remove file system <ipmnt> from active list of log <iplog> |
1456 | * and close it on last close. |
1457 | * |
1458 | * PARAMETER: sb - superblock |
1459 | * |
1460 | * RETURN: errors from subroutines |
1461 | * |
1462 | * serialization: |
1463 | */ |
1464 | int lmLogClose(struct super_block *sb) |
1465 | { |
1466 | struct jfs_sb_info *sbi = JFS_SBI(sb); |
1467 | struct jfs_log *log = sbi->log; |
1468 | struct block_device *bdev; |
1469 | int rc = 0; |
1470 | |
1471 | jfs_info("lmLogClose: log:0x%p", log); |
1472 | |
1473 | mutex_lock(&jfs_log_mutex); |
1474 | LOG_LOCK(log); |
1475 | list_del(&sbi->log_list); |
1476 | LOG_UNLOCK(log); |
1477 | sbi->log = NULL; |
1478 | |
1479 | /* |
1480 | * We need to make sure all of the "written" metapages |
1481 | * actually make it to disk |
1482 | */ |
1483 | sync_blockdev(sb->s_bdev); |
1484 | |
1485 | if (test_bit(log_INLINELOG, &log->flag)) { |
1486 | /* |
1487 | * in-line log in host file system |
1488 | */ |
1489 | rc = lmLogShutdown(log); |
1490 | kfree(log); |
1491 | goto out; |
1492 | } |
1493 | |
1494 | if (!log->no_integrity) |
1495 | lmLogFileSystem(log, sbi, 0); |
1496 | |
1497 | if (!list_empty(&log->sb_list)) |
1498 | goto out; |
1499 | |
1500 | /* |
1501 | * TODO: ensure that the dummy_log is in a state to allow |
1502 | * lbmLogShutdown to deallocate all the buffers and call |
1503 | * kfree against dummy_log. For now, leave dummy_log & its |
1504 | * buffers in memory, and resuse if another no-integrity mount |
1505 | * is requested. |
1506 | */ |
1507 | if (log->no_integrity) |
1508 | goto out; |
1509 | |
1510 | /* |
1511 | * external log as separate logical volume |
1512 | */ |
1513 | list_del(&log->journal_list); |
1514 | bdev = log->bdev; |
1515 | rc = lmLogShutdown(log); |
1516 | |
1517 | bd_release(bdev); |
1518 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1519 | |
1520 | kfree(log); |
1521 | |
1522 | out: |
1523 | mutex_unlock(&jfs_log_mutex); |
1524 | jfs_info("lmLogClose: exit(%d)", rc); |
1525 | return rc; |
1526 | } |
1527 | |
1528 | |
1529 | /* |
1530 | * NAME: jfs_flush_journal() |
1531 | * |
1532 | * FUNCTION: initiate write of any outstanding transactions to the journal |
1533 | * and optionally wait until they are all written to disk |
1534 | * |
1535 | * wait == 0 flush until latest txn is committed, don't wait |
1536 | * wait == 1 flush until latest txn is committed, wait |
1537 | * wait > 1 flush until all txn's are complete, wait |
1538 | */ |
1539 | void jfs_flush_journal(struct jfs_log *log, int wait) |
1540 | { |
1541 | int i; |
1542 | struct tblock *target = NULL; |
1543 | |
1544 | /* jfs_write_inode may call us during read-only mount */ |
1545 | if (!log) |
1546 | return; |
1547 | |
1548 | jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); |
1549 | |
1550 | LOGGC_LOCK(log); |
1551 | |
1552 | if (!list_empty(&log->cqueue)) { |
1553 | /* |
1554 | * This ensures that we will keep writing to the journal as long |
1555 | * as there are unwritten commit records |
1556 | */ |
1557 | target = list_entry(log->cqueue.prev, struct tblock, cqueue); |
1558 | |
1559 | if (test_bit(log_FLUSH, &log->flag)) { |
1560 | /* |
1561 | * We're already flushing. |
1562 | * if flush_tblk is NULL, we are flushing everything, |
1563 | * so leave it that way. Otherwise, update it to the |
1564 | * latest transaction |
1565 | */ |
1566 | if (log->flush_tblk) |
1567 | log->flush_tblk = target; |
1568 | } else { |
1569 | /* Only flush until latest transaction is committed */ |
1570 | log->flush_tblk = target; |
1571 | set_bit(log_FLUSH, &log->flag); |
1572 | |
1573 | /* |
1574 | * Initiate I/O on outstanding transactions |
1575 | */ |
1576 | if (!(log->cflag & logGC_PAGEOUT)) { |
1577 | log->cflag |= logGC_PAGEOUT; |
1578 | lmGCwrite(log, 0); |
1579 | } |
1580 | } |
1581 | } |
1582 | if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { |
1583 | /* Flush until all activity complete */ |
1584 | set_bit(log_FLUSH, &log->flag); |
1585 | log->flush_tblk = NULL; |
1586 | } |
1587 | |
1588 | if (wait && target && !(target->flag & tblkGC_COMMITTED)) { |
1589 | DECLARE_WAITQUEUE(__wait, current); |
1590 | |
1591 | add_wait_queue(&target->gcwait, &__wait); |
1592 | set_current_state(TASK_UNINTERRUPTIBLE); |
1593 | LOGGC_UNLOCK(log); |
1594 | schedule(); |
1595 | __set_current_state(TASK_RUNNING); |
1596 | LOGGC_LOCK(log); |
1597 | remove_wait_queue(&target->gcwait, &__wait); |
1598 | } |
1599 | LOGGC_UNLOCK(log); |
1600 | |
1601 | if (wait < 2) |
1602 | return; |
1603 | |
1604 | write_special_inodes(log, filemap_fdatawrite); |
1605 | |
1606 | /* |
1607 | * If there was recent activity, we may need to wait |
1608 | * for the lazycommit thread to catch up |
1609 | */ |
1610 | if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { |
1611 | for (i = 0; i < 200; i++) { /* Too much? */ |
1612 | msleep(250); |
1613 | write_special_inodes(log, filemap_fdatawrite); |
1614 | if (list_empty(&log->cqueue) && |
1615 | list_empty(&log->synclist)) |
1616 | break; |
1617 | } |
1618 | } |
1619 | assert(list_empty(&log->cqueue)); |
1620 | |
1621 | #ifdef CONFIG_JFS_DEBUG |
1622 | if (!list_empty(&log->synclist)) { |
1623 | struct logsyncblk *lp; |
1624 | |
1625 | printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
1626 | list_for_each_entry(lp, &log->synclist, synclist) { |
1627 | if (lp->xflag & COMMIT_PAGE) { |
1628 | struct metapage *mp = (struct metapage *)lp; |
1629 | print_hex_dump(KERN_ERR, "metapage: ", |
1630 | DUMP_PREFIX_ADDRESS, 16, 4, |
1631 | mp, sizeof(struct metapage), 0); |
1632 | print_hex_dump(KERN_ERR, "page: ", |
1633 | DUMP_PREFIX_ADDRESS, 16, |
1634 | sizeof(long), mp->page, |
1635 | sizeof(struct page), 0); |
1636 | } else |
1637 | print_hex_dump(KERN_ERR, "tblock:", |
1638 | DUMP_PREFIX_ADDRESS, 16, 4, |
1639 | lp, sizeof(struct tblock), 0); |
1640 | } |
1641 | } |
1642 | #else |
1643 | WARN_ON(!list_empty(&log->synclist)); |
1644 | #endif |
1645 | clear_bit(log_FLUSH, &log->flag); |
1646 | } |
1647 | |
1648 | /* |
1649 | * NAME: lmLogShutdown() |
1650 | * |
1651 | * FUNCTION: log shutdown at last LogClose(). |
1652 | * |
1653 | * write log syncpt record. |
1654 | * update super block to set redone flag to 0. |
1655 | * |
1656 | * PARAMETER: log - log inode |
1657 | * |
1658 | * RETURN: 0 - success |
1659 | * |
1660 | * serialization: single last close thread |
1661 | */ |
1662 | int lmLogShutdown(struct jfs_log * log) |
1663 | { |
1664 | int rc; |
1665 | struct lrd lrd; |
1666 | int lsn; |
1667 | struct logsuper *logsuper; |
1668 | struct lbuf *bpsuper; |
1669 | struct lbuf *bp; |
1670 | struct logpage *lp; |
1671 | |
1672 | jfs_info("lmLogShutdown: log:0x%p", log); |
1673 | |
1674 | jfs_flush_journal(log, 2); |
1675 | |
1676 | /* |
1677 | * write the last SYNCPT record with syncpoint = 0 |
1678 | * (i.e., log redo up to HERE !) |
1679 | */ |
1680 | lrd.logtid = 0; |
1681 | lrd.backchain = 0; |
1682 | lrd.type = cpu_to_le16(LOG_SYNCPT); |
1683 | lrd.length = 0; |
1684 | lrd.log.syncpt.sync = 0; |
1685 | |
1686 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
1687 | bp = log->bp; |
1688 | lp = (struct logpage *) bp->l_ldata; |
1689 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); |
1690 | lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); |
1691 | lbmIOWait(log->bp, lbmFREE); |
1692 | log->bp = NULL; |
1693 | |
1694 | /* |
1695 | * synchronous update log superblock |
1696 | * mark log state as shutdown cleanly |
1697 | * (i.e., Log does not need to be replayed). |
1698 | */ |
1699 | if ((rc = lbmRead(log, 1, &bpsuper))) |
1700 | goto out; |
1701 | |
1702 | logsuper = (struct logsuper *) bpsuper->l_ldata; |
1703 | logsuper->state = cpu_to_le32(LOGREDONE); |
1704 | logsuper->end = cpu_to_le32(lsn); |
1705 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
1706 | rc = lbmIOWait(bpsuper, lbmFREE); |
1707 | |
1708 | jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", |
1709 | lsn, log->page, log->eor); |
1710 | |
1711 | out: |
1712 | /* |
1713 | * shutdown per log i/o |
1714 | */ |
1715 | lbmLogShutdown(log); |
1716 | |
1717 | if (rc) { |
1718 | jfs_warn("lmLogShutdown: exit(%d)", rc); |
1719 | } |
1720 | return rc; |
1721 | } |
1722 | |
1723 | |
1724 | /* |
1725 | * NAME: lmLogFileSystem() |
1726 | * |
1727 | * FUNCTION: insert (<activate> = true)/remove (<activate> = false) |
1728 | * file system into/from log active file system list. |
1729 | * |
1730 | * PARAMETE: log - pointer to logs inode. |
1731 | * fsdev - kdev_t of filesystem. |
1732 | * serial - pointer to returned log serial number |
1733 | * activate - insert/remove device from active list. |
1734 | * |
1735 | * RETURN: 0 - success |
1736 | * errors returned by vms_iowait(). |
1737 | */ |
1738 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, |
1739 | int activate) |
1740 | { |
1741 | int rc = 0; |
1742 | int i; |
1743 | struct logsuper *logsuper; |
1744 | struct lbuf *bpsuper; |
1745 | char *uuid = sbi->uuid; |
1746 | |
1747 | /* |
1748 | * insert/remove file system device to log active file system list. |
1749 | */ |
1750 | if ((rc = lbmRead(log, 1, &bpsuper))) |
1751 | return rc; |
1752 | |
1753 | logsuper = (struct logsuper *) bpsuper->l_ldata; |
1754 | if (activate) { |
1755 | for (i = 0; i < MAX_ACTIVE; i++) |
1756 | if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { |
1757 | memcpy(logsuper->active[i].uuid, uuid, 16); |
1758 | sbi->aggregate = i; |
1759 | break; |
1760 | } |
1761 | if (i == MAX_ACTIVE) { |
1762 | jfs_warn("Too many file systems sharing journal!"); |
1763 | lbmFree(bpsuper); |
1764 | return -EMFILE; /* Is there a better rc? */ |
1765 | } |
1766 | } else { |
1767 | for (i = 0; i < MAX_ACTIVE; i++) |
1768 | if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { |
1769 | memcpy(logsuper->active[i].uuid, NULL_UUID, 16); |
1770 | break; |
1771 | } |
1772 | if (i == MAX_ACTIVE) { |
1773 | jfs_warn("Somebody stomped on the journal!"); |
1774 | lbmFree(bpsuper); |
1775 | return -EIO; |
1776 | } |
1777 | |
1778 | } |
1779 | |
1780 | /* |
1781 | * synchronous write log superblock: |
1782 | * |
1783 | * write sidestream bypassing write queue: |
1784 | * at file system mount, log super block is updated for |
1785 | * activation of the file system before any log record |
1786 | * (MOUNT record) of the file system, and at file system |
1787 | * unmount, all meta data for the file system has been |
1788 | * flushed before log super block is updated for deactivation |
1789 | * of the file system. |
1790 | */ |
1791 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); |
1792 | rc = lbmIOWait(bpsuper, lbmFREE); |
1793 | |
1794 | return rc; |
1795 | } |
1796 | |
1797 | /* |
1798 | * log buffer manager (lbm) |
1799 | * ------------------------ |
1800 | * |
1801 | * special purpose buffer manager supporting log i/o requirements. |
1802 | * |
1803 | * per log write queue: |
1804 | * log pageout occurs in serial order by fifo write queue and |
1805 | * restricting to a single i/o in pregress at any one time. |
1806 | * a circular singly-linked list |
1807 | * (log->wrqueue points to the tail, and buffers are linked via |
1808 | * bp->wrqueue field), and |
1809 | * maintains log page in pageout ot waiting for pageout in serial pageout. |
1810 | */ |
1811 | |
1812 | /* |
1813 | * lbmLogInit() |
1814 | * |
1815 | * initialize per log I/O setup at lmLogInit() |
1816 | */ |
1817 | static int lbmLogInit(struct jfs_log * log) |
1818 | { /* log inode */ |
1819 | int i; |
1820 | struct lbuf *lbuf; |
1821 | |
1822 | jfs_info("lbmLogInit: log:0x%p", log); |
1823 | |
1824 | /* initialize current buffer cursor */ |
1825 | log->bp = NULL; |
1826 | |
1827 | /* initialize log device write queue */ |
1828 | log->wqueue = NULL; |
1829 | |
1830 | /* |
1831 | * Each log has its own buffer pages allocated to it. These are |
1832 | * not managed by the page cache. This ensures that a transaction |
1833 | * writing to the log does not block trying to allocate a page from |
1834 | * the page cache (for the log). This would be bad, since page |
1835 | * allocation waits on the kswapd thread that may be committing inodes |
1836 | * which would cause log activity. Was that clear? I'm trying to |
1837 | * avoid deadlock here. |
1838 | */ |
1839 | init_waitqueue_head(&log->free_wait); |
1840 | |
1841 | log->lbuf_free = NULL; |
1842 | |
1843 | for (i = 0; i < LOGPAGES;) { |
1844 | char *buffer; |
1845 | uint offset; |
1846 | struct page *page; |
1847 | |
1848 | buffer = (char *) get_zeroed_page(GFP_KERNEL); |
1849 | if (buffer == NULL) |
1850 | goto error; |
1851 | page = virt_to_page(buffer); |
1852 | for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { |
1853 | lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); |
1854 | if (lbuf == NULL) { |
1855 | if (offset == 0) |
1856 | free_page((unsigned long) buffer); |
1857 | goto error; |
1858 | } |
1859 | if (offset) /* we already have one reference */ |
1860 | get_page(page); |
1861 | lbuf->l_offset = offset; |
1862 | lbuf->l_ldata = buffer + offset; |
1863 | lbuf->l_page = page; |
1864 | lbuf->l_log = log; |
1865 | init_waitqueue_head(&lbuf->l_ioevent); |
1866 | |
1867 | lbuf->l_freelist = log->lbuf_free; |
1868 | log->lbuf_free = lbuf; |
1869 | i++; |
1870 | } |
1871 | } |
1872 | |
1873 | return (0); |
1874 | |
1875 | error: |
1876 | lbmLogShutdown(log); |
1877 | return -ENOMEM; |
1878 | } |
1879 | |
1880 | |
1881 | /* |
1882 | * lbmLogShutdown() |
1883 | * |
1884 | * finalize per log I/O setup at lmLogShutdown() |
1885 | */ |
1886 | static void lbmLogShutdown(struct jfs_log * log) |
1887 | { |
1888 | struct lbuf *lbuf; |
1889 | |
1890 | jfs_info("lbmLogShutdown: log:0x%p", log); |
1891 | |
1892 | lbuf = log->lbuf_free; |
1893 | while (lbuf) { |
1894 | struct lbuf *next = lbuf->l_freelist; |
1895 | __free_page(lbuf->l_page); |
1896 | kfree(lbuf); |
1897 | lbuf = next; |
1898 | } |
1899 | } |
1900 | |
1901 | |
1902 | /* |
1903 | * lbmAllocate() |
1904 | * |
1905 | * allocate an empty log buffer |
1906 | */ |
1907 | static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) |
1908 | { |
1909 | struct lbuf *bp; |
1910 | unsigned long flags; |
1911 | |
1912 | /* |
1913 | * recycle from log buffer freelist if any |
1914 | */ |
1915 | LCACHE_LOCK(flags); |
1916 | LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); |
1917 | log->lbuf_free = bp->l_freelist; |
1918 | LCACHE_UNLOCK(flags); |
1919 | |
1920 | bp->l_flag = 0; |
1921 | |
1922 | bp->l_wqnext = NULL; |
1923 | bp->l_freelist = NULL; |
1924 | |
1925 | bp->l_pn = pn; |
1926 | bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); |
1927 | bp->l_ceor = 0; |
1928 | |
1929 | return bp; |
1930 | } |
1931 | |
1932 | |
1933 | /* |
1934 | * lbmFree() |
1935 | * |
1936 | * release a log buffer to freelist |
1937 | */ |
1938 | static void lbmFree(struct lbuf * bp) |
1939 | { |
1940 | unsigned long flags; |
1941 | |
1942 | LCACHE_LOCK(flags); |
1943 | |
1944 | lbmfree(bp); |
1945 | |
1946 | LCACHE_UNLOCK(flags); |
1947 | } |
1948 | |
1949 | static void lbmfree(struct lbuf * bp) |
1950 | { |
1951 | struct jfs_log *log = bp->l_log; |
1952 | |
1953 | assert(bp->l_wqnext == NULL); |
1954 | |
1955 | /* |
1956 | * return the buffer to head of freelist |
1957 | */ |
1958 | bp->l_freelist = log->lbuf_free; |
1959 | log->lbuf_free = bp; |
1960 | |
1961 | wake_up(&log->free_wait); |
1962 | return; |
1963 | } |
1964 | |
1965 | |
1966 | /* |
1967 | * NAME: lbmRedrive |
1968 | * |
1969 | * FUNCTION: add a log buffer to the log redrive list |
1970 | * |
1971 | * PARAMETER: |
1972 | * bp - log buffer |
1973 | * |
1974 | * NOTES: |
1975 | * Takes log_redrive_lock. |
1976 | */ |
1977 | static inline void lbmRedrive(struct lbuf *bp) |
1978 | { |
1979 | unsigned long flags; |
1980 | |
1981 | spin_lock_irqsave(&log_redrive_lock, flags); |
1982 | bp->l_redrive_next = log_redrive_list; |
1983 | log_redrive_list = bp; |
1984 | spin_unlock_irqrestore(&log_redrive_lock, flags); |
1985 | |
1986 | wake_up_process(jfsIOthread); |
1987 | } |
1988 | |
1989 | |
1990 | /* |
1991 | * lbmRead() |
1992 | */ |
1993 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) |
1994 | { |
1995 | struct bio *bio; |
1996 | struct lbuf *bp; |
1997 | |
1998 | /* |
1999 | * allocate a log buffer |
2000 | */ |
2001 | *bpp = bp = lbmAllocate(log, pn); |
2002 | jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); |
2003 | |
2004 | bp->l_flag |= lbmREAD; |
2005 | |
2006 | bio = bio_alloc(GFP_NOFS, 1); |
2007 | |
2008 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); |
2009 | bio->bi_bdev = log->bdev; |
2010 | bio->bi_io_vec[0].bv_page = bp->l_page; |
2011 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
2012 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
2013 | |
2014 | bio->bi_vcnt = 1; |
2015 | bio->bi_idx = 0; |
2016 | bio->bi_size = LOGPSIZE; |
2017 | |
2018 | bio->bi_end_io = lbmIODone; |
2019 | bio->bi_private = bp; |
2020 | submit_bio(READ_SYNC, bio); |
2021 | |
2022 | wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); |
2023 | |
2024 | return 0; |
2025 | } |
2026 | |
2027 | |
2028 | /* |
2029 | * lbmWrite() |
2030 | * |
2031 | * buffer at head of pageout queue stays after completion of |
2032 | * partial-page pageout and redriven by explicit initiation of |
2033 | * pageout by caller until full-page pageout is completed and |
2034 | * released. |
2035 | * |
2036 | * device driver i/o done redrives pageout of new buffer at |
2037 | * head of pageout queue when current buffer at head of pageout |
2038 | * queue is released at the completion of its full-page pageout. |
2039 | * |
2040 | * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). |
2041 | * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() |
2042 | */ |
2043 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, |
2044 | int cant_block) |
2045 | { |
2046 | struct lbuf *tail; |
2047 | unsigned long flags; |
2048 | |
2049 | jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); |
2050 | |
2051 | /* map the logical block address to physical block address */ |
2052 | bp->l_blkno = |
2053 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); |
2054 | |
2055 | LCACHE_LOCK(flags); /* disable+lock */ |
2056 | |
2057 | /* |
2058 | * initialize buffer for device driver |
2059 | */ |
2060 | bp->l_flag = flag; |
2061 | |
2062 | /* |
2063 | * insert bp at tail of write queue associated with log |
2064 | * |
2065 | * (request is either for bp already/currently at head of queue |
2066 | * or new bp to be inserted at tail) |
2067 | */ |
2068 | tail = log->wqueue; |
2069 | |
2070 | /* is buffer not already on write queue ? */ |
2071 | if (bp->l_wqnext == NULL) { |
2072 | /* insert at tail of wqueue */ |
2073 | if (tail == NULL) { |
2074 | log->wqueue = bp; |
2075 | bp->l_wqnext = bp; |
2076 | } else { |
2077 | log->wqueue = bp; |
2078 | bp->l_wqnext = tail->l_wqnext; |
2079 | tail->l_wqnext = bp; |
2080 | } |
2081 | |
2082 | tail = bp; |
2083 | } |
2084 | |
2085 | /* is buffer at head of wqueue and for write ? */ |
2086 | if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { |
2087 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2088 | return; |
2089 | } |
2090 | |
2091 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2092 | |
2093 | if (cant_block) |
2094 | lbmRedrive(bp); |
2095 | else if (flag & lbmSYNC) |
2096 | lbmStartIO(bp); |
2097 | else { |
2098 | LOGGC_UNLOCK(log); |
2099 | lbmStartIO(bp); |
2100 | LOGGC_LOCK(log); |
2101 | } |
2102 | } |
2103 | |
2104 | |
2105 | /* |
2106 | * lbmDirectWrite() |
2107 | * |
2108 | * initiate pageout bypassing write queue for sidestream |
2109 | * (e.g., log superblock) write; |
2110 | */ |
2111 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) |
2112 | { |
2113 | jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", |
2114 | bp, flag, bp->l_pn); |
2115 | |
2116 | /* |
2117 | * initialize buffer for device driver |
2118 | */ |
2119 | bp->l_flag = flag | lbmDIRECT; |
2120 | |
2121 | /* map the logical block address to physical block address */ |
2122 | bp->l_blkno = |
2123 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); |
2124 | |
2125 | /* |
2126 | * initiate pageout of the page |
2127 | */ |
2128 | lbmStartIO(bp); |
2129 | } |
2130 | |
2131 | |
2132 | /* |
2133 | * NAME: lbmStartIO() |
2134 | * |
2135 | * FUNCTION: Interface to DD strategy routine |
2136 | * |
2137 | * RETURN: none |
2138 | * |
2139 | * serialization: LCACHE_LOCK() is NOT held during log i/o; |
2140 | */ |
2141 | static void lbmStartIO(struct lbuf * bp) |
2142 | { |
2143 | struct bio *bio; |
2144 | struct jfs_log *log = bp->l_log; |
2145 | |
2146 | jfs_info("lbmStartIO\n"); |
2147 | |
2148 | bio = bio_alloc(GFP_NOFS, 1); |
2149 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); |
2150 | bio->bi_bdev = log->bdev; |
2151 | bio->bi_io_vec[0].bv_page = bp->l_page; |
2152 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
2153 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
2154 | |
2155 | bio->bi_vcnt = 1; |
2156 | bio->bi_idx = 0; |
2157 | bio->bi_size = LOGPSIZE; |
2158 | |
2159 | bio->bi_end_io = lbmIODone; |
2160 | bio->bi_private = bp; |
2161 | |
2162 | /* check if journaling to disk has been disabled */ |
2163 | if (log->no_integrity) { |
2164 | bio->bi_size = 0; |
2165 | lbmIODone(bio, 0); |
2166 | } else { |
2167 | submit_bio(WRITE_SYNC, bio); |
2168 | INCREMENT(lmStat.submitted); |
2169 | } |
2170 | } |
2171 | |
2172 | |
2173 | /* |
2174 | * lbmIOWait() |
2175 | */ |
2176 | static int lbmIOWait(struct lbuf * bp, int flag) |
2177 | { |
2178 | unsigned long flags; |
2179 | int rc = 0; |
2180 | |
2181 | jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); |
2182 | |
2183 | LCACHE_LOCK(flags); /* disable+lock */ |
2184 | |
2185 | LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); |
2186 | |
2187 | rc = (bp->l_flag & lbmERROR) ? -EIO : 0; |
2188 | |
2189 | if (flag & lbmFREE) |
2190 | lbmfree(bp); |
2191 | |
2192 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2193 | |
2194 | jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); |
2195 | return rc; |
2196 | } |
2197 | |
2198 | /* |
2199 | * lbmIODone() |
2200 | * |
2201 | * executed at INTIODONE level |
2202 | */ |
2203 | static void lbmIODone(struct bio *bio, int error) |
2204 | { |
2205 | struct lbuf *bp = bio->bi_private; |
2206 | struct lbuf *nextbp, *tail; |
2207 | struct jfs_log *log; |
2208 | unsigned long flags; |
2209 | |
2210 | /* |
2211 | * get back jfs buffer bound to the i/o buffer |
2212 | */ |
2213 | jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); |
2214 | |
2215 | LCACHE_LOCK(flags); /* disable+lock */ |
2216 | |
2217 | bp->l_flag |= lbmDONE; |
2218 | |
2219 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
2220 | bp->l_flag |= lbmERROR; |
2221 | |
2222 | jfs_err("lbmIODone: I/O error in JFS log"); |
2223 | } |
2224 | |
2225 | bio_put(bio); |
2226 | |
2227 | /* |
2228 | * pagein completion |
2229 | */ |
2230 | if (bp->l_flag & lbmREAD) { |
2231 | bp->l_flag &= ~lbmREAD; |
2232 | |
2233 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2234 | |
2235 | /* wakeup I/O initiator */ |
2236 | LCACHE_WAKEUP(&bp->l_ioevent); |
2237 | |
2238 | return; |
2239 | } |
2240 | |
2241 | /* |
2242 | * pageout completion |
2243 | * |
2244 | * the bp at the head of write queue has completed pageout. |
2245 | * |
2246 | * if single-commit/full-page pageout, remove the current buffer |
2247 | * from head of pageout queue, and redrive pageout with |
2248 | * the new buffer at head of pageout queue; |
2249 | * otherwise, the partial-page pageout buffer stays at |
2250 | * the head of pageout queue to be redriven for pageout |
2251 | * by lmGroupCommit() until full-page pageout is completed. |
2252 | */ |
2253 | bp->l_flag &= ~lbmWRITE; |
2254 | INCREMENT(lmStat.pagedone); |
2255 | |
2256 | /* update committed lsn */ |
2257 | log = bp->l_log; |
2258 | log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; |
2259 | |
2260 | if (bp->l_flag & lbmDIRECT) { |
2261 | LCACHE_WAKEUP(&bp->l_ioevent); |
2262 | LCACHE_UNLOCK(flags); |
2263 | return; |
2264 | } |
2265 | |
2266 | tail = log->wqueue; |
2267 | |
2268 | /* single element queue */ |
2269 | if (bp == tail) { |
2270 | /* remove head buffer of full-page pageout |
2271 | * from log device write queue |
2272 | */ |
2273 | if (bp->l_flag & lbmRELEASE) { |
2274 | log->wqueue = NULL; |
2275 | bp->l_wqnext = NULL; |
2276 | } |
2277 | } |
2278 | /* multi element queue */ |
2279 | else { |
2280 | /* remove head buffer of full-page pageout |
2281 | * from log device write queue |
2282 | */ |
2283 | if (bp->l_flag & lbmRELEASE) { |
2284 | nextbp = tail->l_wqnext = bp->l_wqnext; |
2285 | bp->l_wqnext = NULL; |
2286 | |
2287 | /* |
2288 | * redrive pageout of next page at head of write queue: |
2289 | * redrive next page without any bound tblk |
2290 | * (i.e., page w/o any COMMIT records), or |
2291 | * first page of new group commit which has been |
2292 | * queued after current page (subsequent pageout |
2293 | * is performed synchronously, except page without |
2294 | * any COMMITs) by lmGroupCommit() as indicated |
2295 | * by lbmWRITE flag; |
2296 | */ |
2297 | if (nextbp->l_flag & lbmWRITE) { |
2298 | /* |
2299 | * We can't do the I/O at interrupt time. |
2300 | * The jfsIO thread can do it |
2301 | */ |
2302 | lbmRedrive(nextbp); |
2303 | } |
2304 | } |
2305 | } |
2306 | |
2307 | /* |
2308 | * synchronous pageout: |
2309 | * |
2310 | * buffer has not necessarily been removed from write queue |
2311 | * (e.g., synchronous write of partial-page with COMMIT): |
2312 | * leave buffer for i/o initiator to dispose |
2313 | */ |
2314 | if (bp->l_flag & lbmSYNC) { |
2315 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2316 | |
2317 | /* wakeup I/O initiator */ |
2318 | LCACHE_WAKEUP(&bp->l_ioevent); |
2319 | } |
2320 | |
2321 | /* |
2322 | * Group Commit pageout: |
2323 | */ |
2324 | else if (bp->l_flag & lbmGC) { |
2325 | LCACHE_UNLOCK(flags); |
2326 | lmPostGC(bp); |
2327 | } |
2328 | |
2329 | /* |
2330 | * asynchronous pageout: |
2331 | * |
2332 | * buffer must have been removed from write queue: |
2333 | * insert buffer at head of freelist where it can be recycled |
2334 | */ |
2335 | else { |
2336 | assert(bp->l_flag & lbmRELEASE); |
2337 | assert(bp->l_flag & lbmFREE); |
2338 | lbmfree(bp); |
2339 | |
2340 | LCACHE_UNLOCK(flags); /* unlock+enable */ |
2341 | } |
2342 | } |
2343 | |
2344 | int jfsIOWait(void *arg) |
2345 | { |
2346 | struct lbuf *bp; |
2347 | |
2348 | do { |
2349 | spin_lock_irq(&log_redrive_lock); |
2350 | while ((bp = log_redrive_list)) { |
2351 | log_redrive_list = bp->l_redrive_next; |
2352 | bp->l_redrive_next = NULL; |
2353 | spin_unlock_irq(&log_redrive_lock); |
2354 | lbmStartIO(bp); |
2355 | spin_lock_irq(&log_redrive_lock); |
2356 | } |
2357 | |
2358 | if (freezing(current)) { |
2359 | spin_unlock_irq(&log_redrive_lock); |
2360 | refrigerator(); |
2361 | } else { |
2362 | set_current_state(TASK_INTERRUPTIBLE); |
2363 | spin_unlock_irq(&log_redrive_lock); |
2364 | schedule(); |
2365 | __set_current_state(TASK_RUNNING); |
2366 | } |
2367 | } while (!kthread_should_stop()); |
2368 | |
2369 | jfs_info("jfsIOWait being killed!"); |
2370 | return 0; |
2371 | } |
2372 | |
2373 | /* |
2374 | * NAME: lmLogFormat()/jfs_logform() |
2375 | * |
2376 | * FUNCTION: format file system log |
2377 | * |
2378 | * PARAMETERS: |
2379 | * log - volume log |
2380 | * logAddress - start address of log space in FS block |
2381 | * logSize - length of log space in FS block; |
2382 | * |
2383 | * RETURN: 0 - success |
2384 | * -EIO - i/o error |
2385 | * |
2386 | * XXX: We're synchronously writing one page at a time. This needs to |
2387 | * be improved by writing multiple pages at once. |
2388 | */ |
2389 | int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) |
2390 | { |
2391 | int rc = -EIO; |
2392 | struct jfs_sb_info *sbi; |
2393 | struct logsuper *logsuper; |
2394 | struct logpage *lp; |
2395 | int lspn; /* log sequence page number */ |
2396 | struct lrd *lrd_ptr; |
2397 | int npages = 0; |
2398 | struct lbuf *bp; |
2399 | |
2400 | jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", |
2401 | (long long)logAddress, logSize); |
2402 | |
2403 | sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); |
2404 | |
2405 | /* allocate a log buffer */ |
2406 | bp = lbmAllocate(log, 1); |
2407 | |
2408 | npages = logSize >> sbi->l2nbperpage; |
2409 | |
2410 | /* |
2411 | * log space: |
2412 | * |
2413 | * page 0 - reserved; |
2414 | * page 1 - log superblock; |
2415 | * page 2 - log data page: A SYNC log record is written |
2416 | * into this page at logform time; |
2417 | * pages 3-N - log data page: set to empty log data pages; |
2418 | */ |
2419 | /* |
2420 | * init log superblock: log page 1 |
2421 | */ |
2422 | logsuper = (struct logsuper *) bp->l_ldata; |
2423 | |
2424 | logsuper->magic = cpu_to_le32(LOGMAGIC); |
2425 | logsuper->version = cpu_to_le32(LOGVERSION); |
2426 | logsuper->state = cpu_to_le32(LOGREDONE); |
2427 | logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ |
2428 | logsuper->size = cpu_to_le32(npages); |
2429 | logsuper->bsize = cpu_to_le32(sbi->bsize); |
2430 | logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); |
2431 | logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); |
2432 | |
2433 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
2434 | bp->l_blkno = logAddress + sbi->nbperpage; |
2435 | lbmStartIO(bp); |
2436 | if ((rc = lbmIOWait(bp, 0))) |
2437 | goto exit; |
2438 | |
2439 | /* |
2440 | * init pages 2 to npages-1 as log data pages: |
2441 | * |
2442 | * log page sequence number (lpsn) initialization: |
2443 | * |
2444 | * pn: 0 1 2 3 n-1 |
2445 | * +-----+-----+=====+=====+===.....===+=====+ |
2446 | * lspn: N-1 0 1 N-2 |
2447 | * <--- N page circular file ----> |
2448 | * |
2449 | * the N (= npages-2) data pages of the log is maintained as |
2450 | * a circular file for the log records; |
2451 | * lpsn grows by 1 monotonically as each log page is written |
2452 | * to the circular file of the log; |
2453 | * and setLogpage() will not reset the page number even if |
2454 | * the eor is equal to LOGPHDRSIZE. In order for binary search |
2455 | * still work in find log end process, we have to simulate the |
2456 | * log wrap situation at the log format time. |
2457 | * The 1st log page written will have the highest lpsn. Then |
2458 | * the succeeding log pages will have ascending order of |
2459 | * the lspn starting from 0, ... (N-2) |
2460 | */ |
2461 | lp = (struct logpage *) bp->l_ldata; |
2462 | /* |
2463 | * initialize 1st log page to be written: lpsn = N - 1, |
2464 | * write a SYNCPT log record is written to this page |
2465 | */ |
2466 | lp->h.page = lp->t.page = cpu_to_le32(npages - 3); |
2467 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); |
2468 | |
2469 | lrd_ptr = (struct lrd *) &lp->data; |
2470 | lrd_ptr->logtid = 0; |
2471 | lrd_ptr->backchain = 0; |
2472 | lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); |
2473 | lrd_ptr->length = 0; |
2474 | lrd_ptr->log.syncpt.sync = 0; |
2475 | |
2476 | bp->l_blkno += sbi->nbperpage; |
2477 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
2478 | lbmStartIO(bp); |
2479 | if ((rc = lbmIOWait(bp, 0))) |
2480 | goto exit; |
2481 | |
2482 | /* |
2483 | * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) |
2484 | */ |
2485 | for (lspn = 0; lspn < npages - 3; lspn++) { |
2486 | lp->h.page = lp->t.page = cpu_to_le32(lspn); |
2487 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); |
2488 | |
2489 | bp->l_blkno += sbi->nbperpage; |
2490 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; |
2491 | lbmStartIO(bp); |
2492 | if ((rc = lbmIOWait(bp, 0))) |
2493 | goto exit; |
2494 | } |
2495 | |
2496 | rc = 0; |
2497 | exit: |
2498 | /* |
2499 | * finalize log |
2500 | */ |
2501 | /* release the buffer */ |
2502 | lbmFree(bp); |
2503 | |
2504 | return rc; |
2505 | } |
2506 | |
2507 | #ifdef CONFIG_JFS_STATISTICS |
2508 | static int jfs_lmstats_proc_show(struct seq_file *m, void *v) |
2509 | { |
2510 | seq_printf(m, |
2511 | "JFS Logmgr stats\n" |
2512 | "================\n" |
2513 | "commits = %d\n" |
2514 | "writes submitted = %d\n" |
2515 | "writes completed = %d\n" |
2516 | "full pages submitted = %d\n" |
2517 | "partial pages submitted = %d\n", |
2518 | lmStat.commit, |
2519 | lmStat.submitted, |
2520 | lmStat.pagedone, |
2521 | lmStat.full_page, |
2522 | lmStat.partial_page); |
2523 | return 0; |
2524 | } |
2525 | |
2526 | static int jfs_lmstats_proc_open(struct inode *inode, struct file *file) |
2527 | { |
2528 | return single_open(file, jfs_lmstats_proc_show, NULL); |
2529 | } |
2530 | |
2531 | const struct file_operations jfs_lmstats_proc_fops = { |
2532 | .owner = THIS_MODULE, |
2533 | .open = jfs_lmstats_proc_open, |
2534 | .read = seq_read, |
2535 | .llseek = seq_lseek, |
2536 | .release = single_release, |
2537 | }; |
2538 | #endif /* CONFIG_JFS_STATISTICS */ |
2539 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9