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1da177e4 LT |
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/smp_lock.h> | |
66 | #include <linux/completion.h> | |
67 | #include <linux/buffer_head.h> /* for sync_blockdev() */ | |
68 | #include <linux/bio.h> | |
69 | #include <linux/suspend.h> | |
70 | #include <linux/delay.h> | |
71 | #include "jfs_incore.h" | |
72 | #include "jfs_filsys.h" | |
73 | #include "jfs_metapage.h" | |
74 | #include "jfs_txnmgr.h" | |
75 | #include "jfs_debug.h" | |
76 | ||
77 | ||
78 | /* | |
79 | * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) | |
80 | */ | |
81 | static struct lbuf *log_redrive_list; | |
82 | static DEFINE_SPINLOCK(log_redrive_lock); | |
83 | DECLARE_WAIT_QUEUE_HEAD(jfs_IO_thread_wait); | |
84 | ||
85 | ||
86 | /* | |
87 | * log read/write serialization (per log) | |
88 | */ | |
89 | #define LOG_LOCK_INIT(log) init_MUTEX(&(log)->loglock) | |
90 | #define LOG_LOCK(log) down(&((log)->loglock)) | |
91 | #define LOG_UNLOCK(log) up(&((log)->loglock)) | |
92 | ||
93 | ||
94 | /* | |
95 | * log group commit serialization (per log) | |
96 | */ | |
97 | ||
98 | #define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) | |
99 | #define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) | |
100 | #define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) | |
101 | #define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) | |
102 | ||
103 | /* | |
104 | * log sync serialization (per log) | |
105 | */ | |
106 | #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) | |
107 | #define LOGSYNC_BARRIER(logsize) ((logsize)/4) | |
108 | /* | |
109 | #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) | |
110 | #define LOGSYNC_BARRIER(logsize) ((logsize)/2) | |
111 | */ | |
112 | ||
113 | ||
114 | /* | |
115 | * log buffer cache synchronization | |
116 | */ | |
117 | static DEFINE_SPINLOCK(jfsLCacheLock); | |
118 | ||
119 | #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) | |
120 | #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) | |
121 | ||
122 | /* | |
123 | * See __SLEEP_COND in jfs_locks.h | |
124 | */ | |
125 | #define LCACHE_SLEEP_COND(wq, cond, flags) \ | |
126 | do { \ | |
127 | if (cond) \ | |
128 | break; \ | |
129 | __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ | |
130 | } while (0) | |
131 | ||
132 | #define LCACHE_WAKEUP(event) wake_up(event) | |
133 | ||
134 | ||
135 | /* | |
136 | * lbuf buffer cache (lCache) control | |
137 | */ | |
138 | /* log buffer manager pageout control (cumulative, inclusive) */ | |
139 | #define lbmREAD 0x0001 | |
140 | #define lbmWRITE 0x0002 /* enqueue at tail of write queue; | |
141 | * init pageout if at head of queue; | |
142 | */ | |
143 | #define lbmRELEASE 0x0004 /* remove from write queue | |
144 | * at completion of pageout; | |
145 | * do not free/recycle it yet: | |
146 | * caller will free it; | |
147 | */ | |
148 | #define lbmSYNC 0x0008 /* do not return to freelist | |
149 | * when removed from write queue; | |
150 | */ | |
151 | #define lbmFREE 0x0010 /* return to freelist | |
152 | * at completion of pageout; | |
153 | * the buffer may be recycled; | |
154 | */ | |
155 | #define lbmDONE 0x0020 | |
156 | #define lbmERROR 0x0040 | |
157 | #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing | |
158 | * of log page | |
159 | */ | |
160 | #define lbmDIRECT 0x0100 | |
161 | ||
162 | /* | |
163 | * Global list of active external journals | |
164 | */ | |
165 | static LIST_HEAD(jfs_external_logs); | |
166 | static struct jfs_log *dummy_log = NULL; | |
167 | static DECLARE_MUTEX(jfs_log_sem); | |
168 | ||
169 | /* | |
170 | * external references | |
171 | */ | |
172 | extern void txLazyUnlock(struct tblock * tblk); | |
173 | extern int jfs_stop_threads; | |
174 | extern struct completion jfsIOwait; | |
175 | extern int jfs_tlocks_low; | |
176 | ||
177 | /* | |
178 | * forward references | |
179 | */ | |
180 | static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, | |
181 | struct lrd * lrd, struct tlock * tlck); | |
182 | ||
183 | static int lmNextPage(struct jfs_log * log); | |
184 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
185 | int activate); | |
186 | ||
187 | static int open_inline_log(struct super_block *sb); | |
188 | static int open_dummy_log(struct super_block *sb); | |
189 | static int lbmLogInit(struct jfs_log * log); | |
190 | static void lbmLogShutdown(struct jfs_log * log); | |
191 | static struct lbuf *lbmAllocate(struct jfs_log * log, int); | |
192 | static void lbmFree(struct lbuf * bp); | |
193 | static void lbmfree(struct lbuf * bp); | |
194 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); | |
195 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); | |
196 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); | |
197 | static int lbmIOWait(struct lbuf * bp, int flag); | |
198 | static bio_end_io_t lbmIODone; | |
199 | static void lbmStartIO(struct lbuf * bp); | |
200 | static void lmGCwrite(struct jfs_log * log, int cant_block); | |
201 | static int lmLogSync(struct jfs_log * log, int nosyncwait); | |
202 | ||
203 | ||
204 | ||
205 | /* | |
206 | * statistics | |
207 | */ | |
208 | #ifdef CONFIG_JFS_STATISTICS | |
209 | static struct lmStat { | |
210 | uint commit; /* # of commit */ | |
211 | uint pagedone; /* # of page written */ | |
212 | uint submitted; /* # of pages submitted */ | |
213 | uint full_page; /* # of full pages submitted */ | |
214 | uint partial_page; /* # of partial pages submitted */ | |
215 | } lmStat; | |
216 | #endif | |
217 | ||
218 | ||
219 | /* | |
220 | * NAME: lmLog() | |
221 | * | |
222 | * FUNCTION: write a log record; | |
223 | * | |
224 | * PARAMETER: | |
225 | * | |
226 | * RETURN: lsn - offset to the next log record to write (end-of-log); | |
227 | * -1 - error; | |
228 | * | |
229 | * note: todo: log error handler | |
230 | */ | |
231 | int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
232 | struct tlock * tlck) | |
233 | { | |
234 | int lsn; | |
235 | int diffp, difft; | |
236 | struct metapage *mp = NULL; | |
237 | ||
238 | jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", | |
239 | log, tblk, lrd, tlck); | |
240 | ||
241 | LOG_LOCK(log); | |
242 | ||
243 | /* log by (out-of-transaction) JFS ? */ | |
244 | if (tblk == NULL) | |
245 | goto writeRecord; | |
246 | ||
247 | /* log from page ? */ | |
248 | if (tlck == NULL || | |
249 | tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) | |
250 | goto writeRecord; | |
251 | ||
252 | /* | |
253 | * initialize/update page/transaction recovery lsn | |
254 | */ | |
255 | lsn = log->lsn; | |
256 | ||
257 | LOGSYNC_LOCK(log); | |
258 | ||
259 | /* | |
260 | * initialize page lsn if first log write of the page | |
261 | */ | |
262 | if (mp->lsn == 0) { | |
263 | mp->log = log; | |
264 | mp->lsn = lsn; | |
265 | log->count++; | |
266 | ||
267 | /* insert page at tail of logsynclist */ | |
268 | list_add_tail(&mp->synclist, &log->synclist); | |
269 | } | |
270 | ||
271 | /* | |
272 | * initialize/update lsn of tblock of the page | |
273 | * | |
274 | * transaction inherits oldest lsn of pages associated | |
275 | * with allocation/deallocation of resources (their | |
276 | * log records are used to reconstruct allocation map | |
277 | * at recovery time: inode for inode allocation map, | |
278 | * B+-tree index of extent descriptors for block | |
279 | * allocation map); | |
280 | * allocation map pages inherit transaction lsn at | |
281 | * commit time to allow forwarding log syncpt past log | |
282 | * records associated with allocation/deallocation of | |
283 | * resources only after persistent map of these map pages | |
284 | * have been updated and propagated to home. | |
285 | */ | |
286 | /* | |
287 | * initialize transaction lsn: | |
288 | */ | |
289 | if (tblk->lsn == 0) { | |
290 | /* inherit lsn of its first page logged */ | |
291 | tblk->lsn = mp->lsn; | |
292 | log->count++; | |
293 | ||
294 | /* insert tblock after the page on logsynclist */ | |
295 | list_add(&tblk->synclist, &mp->synclist); | |
296 | } | |
297 | /* | |
298 | * update transaction lsn: | |
299 | */ | |
300 | else { | |
301 | /* inherit oldest/smallest lsn of page */ | |
302 | logdiff(diffp, mp->lsn, log); | |
303 | logdiff(difft, tblk->lsn, log); | |
304 | if (diffp < difft) { | |
305 | /* update tblock lsn with page lsn */ | |
306 | tblk->lsn = mp->lsn; | |
307 | ||
308 | /* move tblock after page on logsynclist */ | |
309 | list_move(&tblk->synclist, &mp->synclist); | |
310 | } | |
311 | } | |
312 | ||
313 | LOGSYNC_UNLOCK(log); | |
314 | ||
315 | /* | |
316 | * write the log record | |
317 | */ | |
318 | writeRecord: | |
319 | lsn = lmWriteRecord(log, tblk, lrd, tlck); | |
320 | ||
321 | /* | |
322 | * forward log syncpt if log reached next syncpt trigger | |
323 | */ | |
324 | logdiff(diffp, lsn, log); | |
325 | if (diffp >= log->nextsync) | |
326 | lsn = lmLogSync(log, 0); | |
327 | ||
328 | /* update end-of-log lsn */ | |
329 | log->lsn = lsn; | |
330 | ||
331 | LOG_UNLOCK(log); | |
332 | ||
333 | /* return end-of-log address */ | |
334 | return lsn; | |
335 | } | |
336 | ||
337 | ||
338 | /* | |
339 | * NAME: lmWriteRecord() | |
340 | * | |
341 | * FUNCTION: move the log record to current log page | |
342 | * | |
343 | * PARAMETER: cd - commit descriptor | |
344 | * | |
345 | * RETURN: end-of-log address | |
346 | * | |
347 | * serialization: LOG_LOCK() held on entry/exit | |
348 | */ | |
349 | static int | |
350 | lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
351 | struct tlock * tlck) | |
352 | { | |
353 | int lsn = 0; /* end-of-log address */ | |
354 | struct lbuf *bp; /* dst log page buffer */ | |
355 | struct logpage *lp; /* dst log page */ | |
356 | caddr_t dst; /* destination address in log page */ | |
357 | int dstoffset; /* end-of-log offset in log page */ | |
358 | int freespace; /* free space in log page */ | |
359 | caddr_t p; /* src meta-data page */ | |
360 | caddr_t src; | |
361 | int srclen; | |
362 | int nbytes; /* number of bytes to move */ | |
363 | int i; | |
364 | int len; | |
365 | struct linelock *linelock; | |
366 | struct lv *lv; | |
367 | struct lvd *lvd; | |
368 | int l2linesize; | |
369 | ||
370 | len = 0; | |
371 | ||
372 | /* retrieve destination log page to write */ | |
373 | bp = (struct lbuf *) log->bp; | |
374 | lp = (struct logpage *) bp->l_ldata; | |
375 | dstoffset = log->eor; | |
376 | ||
377 | /* any log data to write ? */ | |
378 | if (tlck == NULL) | |
379 | goto moveLrd; | |
380 | ||
381 | /* | |
382 | * move log record data | |
383 | */ | |
384 | /* retrieve source meta-data page to log */ | |
385 | if (tlck->flag & tlckPAGELOCK) { | |
386 | p = (caddr_t) (tlck->mp->data); | |
387 | linelock = (struct linelock *) & tlck->lock; | |
388 | } | |
389 | /* retrieve source in-memory inode to log */ | |
390 | else if (tlck->flag & tlckINODELOCK) { | |
391 | if (tlck->type & tlckDTREE) | |
392 | p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; | |
393 | else | |
394 | p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; | |
395 | linelock = (struct linelock *) & tlck->lock; | |
396 | } | |
397 | #ifdef _JFS_WIP | |
398 | else if (tlck->flag & tlckINLINELOCK) { | |
399 | ||
400 | inlinelock = (struct inlinelock *) & tlck; | |
401 | p = (caddr_t) & inlinelock->pxd; | |
402 | linelock = (struct linelock *) & tlck; | |
403 | } | |
404 | #endif /* _JFS_WIP */ | |
405 | else { | |
406 | jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); | |
407 | return 0; /* Probably should trap */ | |
408 | } | |
409 | l2linesize = linelock->l2linesize; | |
410 | ||
411 | moveData: | |
412 | ASSERT(linelock->index <= linelock->maxcnt); | |
413 | ||
414 | lv = linelock->lv; | |
415 | for (i = 0; i < linelock->index; i++, lv++) { | |
416 | if (lv->length == 0) | |
417 | continue; | |
418 | ||
419 | /* is page full ? */ | |
420 | if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { | |
421 | /* page become full: move on to next page */ | |
422 | lmNextPage(log); | |
423 | ||
424 | bp = log->bp; | |
425 | lp = (struct logpage *) bp->l_ldata; | |
426 | dstoffset = LOGPHDRSIZE; | |
427 | } | |
428 | ||
429 | /* | |
430 | * move log vector data | |
431 | */ | |
432 | src = (u8 *) p + (lv->offset << l2linesize); | |
433 | srclen = lv->length << l2linesize; | |
434 | len += srclen; | |
435 | while (srclen > 0) { | |
436 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
437 | nbytes = min(freespace, srclen); | |
438 | dst = (caddr_t) lp + dstoffset; | |
439 | memcpy(dst, src, nbytes); | |
440 | dstoffset += nbytes; | |
441 | ||
442 | /* is page not full ? */ | |
443 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
444 | break; | |
445 | ||
446 | /* page become full: move on to next page */ | |
447 | lmNextPage(log); | |
448 | ||
449 | bp = (struct lbuf *) log->bp; | |
450 | lp = (struct logpage *) bp->l_ldata; | |
451 | dstoffset = LOGPHDRSIZE; | |
452 | ||
453 | srclen -= nbytes; | |
454 | src += nbytes; | |
455 | } | |
456 | ||
457 | /* | |
458 | * move log vector descriptor | |
459 | */ | |
460 | len += 4; | |
461 | lvd = (struct lvd *) ((caddr_t) lp + dstoffset); | |
462 | lvd->offset = cpu_to_le16(lv->offset); | |
463 | lvd->length = cpu_to_le16(lv->length); | |
464 | dstoffset += 4; | |
465 | jfs_info("lmWriteRecord: lv offset:%d length:%d", | |
466 | lv->offset, lv->length); | |
467 | } | |
468 | ||
469 | if ((i = linelock->next)) { | |
470 | linelock = (struct linelock *) lid_to_tlock(i); | |
471 | goto moveData; | |
472 | } | |
473 | ||
474 | /* | |
475 | * move log record descriptor | |
476 | */ | |
477 | moveLrd: | |
478 | lrd->length = cpu_to_le16(len); | |
479 | ||
480 | src = (caddr_t) lrd; | |
481 | srclen = LOGRDSIZE; | |
482 | ||
483 | while (srclen > 0) { | |
484 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
485 | nbytes = min(freespace, srclen); | |
486 | dst = (caddr_t) lp + dstoffset; | |
487 | memcpy(dst, src, nbytes); | |
488 | ||
489 | dstoffset += nbytes; | |
490 | srclen -= nbytes; | |
491 | ||
492 | /* are there more to move than freespace of page ? */ | |
493 | if (srclen) | |
494 | goto pageFull; | |
495 | ||
496 | /* | |
497 | * end of log record descriptor | |
498 | */ | |
499 | ||
500 | /* update last log record eor */ | |
501 | log->eor = dstoffset; | |
502 | bp->l_eor = dstoffset; | |
503 | lsn = (log->page << L2LOGPSIZE) + dstoffset; | |
504 | ||
505 | if (lrd->type & cpu_to_le16(LOG_COMMIT)) { | |
506 | tblk->clsn = lsn; | |
507 | jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, | |
508 | bp->l_eor); | |
509 | ||
510 | INCREMENT(lmStat.commit); /* # of commit */ | |
511 | ||
512 | /* | |
513 | * enqueue tblock for group commit: | |
514 | * | |
515 | * enqueue tblock of non-trivial/synchronous COMMIT | |
516 | * at tail of group commit queue | |
517 | * (trivial/asynchronous COMMITs are ignored by | |
518 | * group commit.) | |
519 | */ | |
520 | LOGGC_LOCK(log); | |
521 | ||
522 | /* init tblock gc state */ | |
523 | tblk->flag = tblkGC_QUEUE; | |
524 | tblk->bp = log->bp; | |
525 | tblk->pn = log->page; | |
526 | tblk->eor = log->eor; | |
527 | ||
528 | /* enqueue transaction to commit queue */ | |
529 | list_add_tail(&tblk->cqueue, &log->cqueue); | |
530 | ||
531 | LOGGC_UNLOCK(log); | |
532 | } | |
533 | ||
534 | jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", | |
535 | le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); | |
536 | ||
537 | /* page not full ? */ | |
538 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
539 | return lsn; | |
540 | ||
541 | pageFull: | |
542 | /* page become full: move on to next page */ | |
543 | lmNextPage(log); | |
544 | ||
545 | bp = (struct lbuf *) log->bp; | |
546 | lp = (struct logpage *) bp->l_ldata; | |
547 | dstoffset = LOGPHDRSIZE; | |
548 | src += nbytes; | |
549 | } | |
550 | ||
551 | return lsn; | |
552 | } | |
553 | ||
554 | ||
555 | /* | |
556 | * NAME: lmNextPage() | |
557 | * | |
558 | * FUNCTION: write current page and allocate next page. | |
559 | * | |
560 | * PARAMETER: log | |
561 | * | |
562 | * RETURN: 0 | |
563 | * | |
564 | * serialization: LOG_LOCK() held on entry/exit | |
565 | */ | |
566 | static int lmNextPage(struct jfs_log * log) | |
567 | { | |
568 | struct logpage *lp; | |
569 | int lspn; /* log sequence page number */ | |
570 | int pn; /* current page number */ | |
571 | struct lbuf *bp; | |
572 | struct lbuf *nextbp; | |
573 | struct tblock *tblk; | |
574 | ||
575 | /* get current log page number and log sequence page number */ | |
576 | pn = log->page; | |
577 | bp = log->bp; | |
578 | lp = (struct logpage *) bp->l_ldata; | |
579 | lspn = le32_to_cpu(lp->h.page); | |
580 | ||
581 | LOGGC_LOCK(log); | |
582 | ||
583 | /* | |
584 | * write or queue the full page at the tail of write queue | |
585 | */ | |
586 | /* get the tail tblk on commit queue */ | |
587 | if (list_empty(&log->cqueue)) | |
588 | tblk = NULL; | |
589 | else | |
590 | tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
591 | ||
592 | /* every tblk who has COMMIT record on the current page, | |
593 | * and has not been committed, must be on commit queue | |
594 | * since tblk is queued at commit queueu at the time | |
595 | * of writing its COMMIT record on the page before | |
596 | * page becomes full (even though the tblk thread | |
597 | * who wrote COMMIT record may have been suspended | |
598 | * currently); | |
599 | */ | |
600 | ||
601 | /* is page bound with outstanding tail tblk ? */ | |
602 | if (tblk && tblk->pn == pn) { | |
603 | /* mark tblk for end-of-page */ | |
604 | tblk->flag |= tblkGC_EOP; | |
605 | ||
606 | if (log->cflag & logGC_PAGEOUT) { | |
607 | /* if page is not already on write queue, | |
608 | * just enqueue (no lbmWRITE to prevent redrive) | |
609 | * buffer to wqueue to ensure correct serial order | |
610 | * of the pages since log pages will be added | |
611 | * continuously | |
612 | */ | |
613 | if (bp->l_wqnext == NULL) | |
614 | lbmWrite(log, bp, 0, 0); | |
615 | } else { | |
616 | /* | |
617 | * No current GC leader, initiate group commit | |
618 | */ | |
619 | log->cflag |= logGC_PAGEOUT; | |
620 | lmGCwrite(log, 0); | |
621 | } | |
622 | } | |
623 | /* page is not bound with outstanding tblk: | |
624 | * init write or mark it to be redriven (lbmWRITE) | |
625 | */ | |
626 | else { | |
627 | /* finalize the page */ | |
628 | bp->l_ceor = bp->l_eor; | |
629 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
630 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); | |
631 | } | |
632 | LOGGC_UNLOCK(log); | |
633 | ||
634 | /* | |
635 | * allocate/initialize next page | |
636 | */ | |
637 | /* if log wraps, the first data page of log is 2 | |
638 | * (0 never used, 1 is superblock). | |
639 | */ | |
640 | log->page = (pn == log->size - 1) ? 2 : pn + 1; | |
641 | log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ | |
642 | ||
643 | /* allocate/initialize next log page buffer */ | |
644 | nextbp = lbmAllocate(log, log->page); | |
645 | nextbp->l_eor = log->eor; | |
646 | log->bp = nextbp; | |
647 | ||
648 | /* initialize next log page */ | |
649 | lp = (struct logpage *) nextbp->l_ldata; | |
650 | lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); | |
651 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | ||
657 | /* | |
658 | * NAME: lmGroupCommit() | |
659 | * | |
660 | * FUNCTION: group commit | |
661 | * initiate pageout of the pages with COMMIT in the order of | |
662 | * page number - redrive pageout of the page at the head of | |
663 | * pageout queue until full page has been written. | |
664 | * | |
665 | * RETURN: | |
666 | * | |
667 | * NOTE: | |
668 | * LOGGC_LOCK serializes log group commit queue, and | |
669 | * transaction blocks on the commit queue. | |
670 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
671 | */ | |
672 | int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) | |
673 | { | |
674 | int rc = 0; | |
675 | ||
676 | LOGGC_LOCK(log); | |
677 | ||
678 | /* group committed already ? */ | |
679 | if (tblk->flag & tblkGC_COMMITTED) { | |
680 | if (tblk->flag & tblkGC_ERROR) | |
681 | rc = -EIO; | |
682 | ||
683 | LOGGC_UNLOCK(log); | |
684 | return rc; | |
685 | } | |
686 | jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); | |
687 | ||
688 | if (tblk->xflag & COMMIT_LAZY) | |
689 | tblk->flag |= tblkGC_LAZY; | |
690 | ||
691 | if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && | |
692 | (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) | |
693 | || jfs_tlocks_low)) { | |
694 | /* | |
695 | * No pageout in progress | |
696 | * | |
697 | * start group commit as its group leader. | |
698 | */ | |
699 | log->cflag |= logGC_PAGEOUT; | |
700 | ||
701 | lmGCwrite(log, 0); | |
702 | } | |
703 | ||
704 | if (tblk->xflag & COMMIT_LAZY) { | |
705 | /* | |
706 | * Lazy transactions can leave now | |
707 | */ | |
708 | LOGGC_UNLOCK(log); | |
709 | return 0; | |
710 | } | |
711 | ||
712 | /* lmGCwrite gives up LOGGC_LOCK, check again */ | |
713 | ||
714 | if (tblk->flag & tblkGC_COMMITTED) { | |
715 | if (tblk->flag & tblkGC_ERROR) | |
716 | rc = -EIO; | |
717 | ||
718 | LOGGC_UNLOCK(log); | |
719 | return rc; | |
720 | } | |
721 | ||
722 | /* upcount transaction waiting for completion | |
723 | */ | |
724 | log->gcrtc++; | |
725 | tblk->flag |= tblkGC_READY; | |
726 | ||
727 | __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), | |
728 | LOGGC_LOCK(log), LOGGC_UNLOCK(log)); | |
729 | ||
730 | /* removed from commit queue */ | |
731 | if (tblk->flag & tblkGC_ERROR) | |
732 | rc = -EIO; | |
733 | ||
734 | LOGGC_UNLOCK(log); | |
735 | return rc; | |
736 | } | |
737 | ||
738 | /* | |
739 | * NAME: lmGCwrite() | |
740 | * | |
741 | * FUNCTION: group commit write | |
742 | * initiate write of log page, building a group of all transactions | |
743 | * with commit records on that page. | |
744 | * | |
745 | * RETURN: None | |
746 | * | |
747 | * NOTE: | |
748 | * LOGGC_LOCK must be held by caller. | |
749 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
750 | */ | |
751 | static void lmGCwrite(struct jfs_log * log, int cant_write) | |
752 | { | |
753 | struct lbuf *bp; | |
754 | struct logpage *lp; | |
755 | int gcpn; /* group commit page number */ | |
756 | struct tblock *tblk; | |
757 | struct tblock *xtblk = NULL; | |
758 | ||
759 | /* | |
760 | * build the commit group of a log page | |
761 | * | |
762 | * scan commit queue and make a commit group of all | |
763 | * transactions with COMMIT records on the same log page. | |
764 | */ | |
765 | /* get the head tblk on the commit queue */ | |
766 | gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; | |
767 | ||
768 | list_for_each_entry(tblk, &log->cqueue, cqueue) { | |
769 | if (tblk->pn != gcpn) | |
770 | break; | |
771 | ||
772 | xtblk = tblk; | |
773 | ||
774 | /* state transition: (QUEUE, READY) -> COMMIT */ | |
775 | tblk->flag |= tblkGC_COMMIT; | |
776 | } | |
777 | tblk = xtblk; /* last tblk of the page */ | |
778 | ||
779 | /* | |
780 | * pageout to commit transactions on the log page. | |
781 | */ | |
782 | bp = (struct lbuf *) tblk->bp; | |
783 | lp = (struct logpage *) bp->l_ldata; | |
784 | /* is page already full ? */ | |
785 | if (tblk->flag & tblkGC_EOP) { | |
786 | /* mark page to free at end of group commit of the page */ | |
787 | tblk->flag &= ~tblkGC_EOP; | |
788 | tblk->flag |= tblkGC_FREE; | |
789 | bp->l_ceor = bp->l_eor; | |
790 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
791 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, | |
792 | cant_write); | |
793 | INCREMENT(lmStat.full_page); | |
794 | } | |
795 | /* page is not yet full */ | |
796 | else { | |
797 | bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ | |
798 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
799 | lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); | |
800 | INCREMENT(lmStat.partial_page); | |
801 | } | |
802 | } | |
803 | ||
804 | /* | |
805 | * NAME: lmPostGC() | |
806 | * | |
807 | * FUNCTION: group commit post-processing | |
808 | * Processes transactions after their commit records have been written | |
809 | * to disk, redriving log I/O if necessary. | |
810 | * | |
811 | * RETURN: None | |
812 | * | |
813 | * NOTE: | |
814 | * This routine is called a interrupt time by lbmIODone | |
815 | */ | |
816 | static void lmPostGC(struct lbuf * bp) | |
817 | { | |
818 | unsigned long flags; | |
819 | struct jfs_log *log = bp->l_log; | |
820 | struct logpage *lp; | |
821 | struct tblock *tblk, *temp; | |
822 | ||
823 | //LOGGC_LOCK(log); | |
824 | spin_lock_irqsave(&log->gclock, flags); | |
825 | /* | |
826 | * current pageout of group commit completed. | |
827 | * | |
828 | * remove/wakeup transactions from commit queue who were | |
829 | * group committed with the current log page | |
830 | */ | |
831 | list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { | |
832 | if (!(tblk->flag & tblkGC_COMMIT)) | |
833 | break; | |
834 | /* if transaction was marked GC_COMMIT then | |
835 | * it has been shipped in the current pageout | |
836 | * and made it to disk - it is committed. | |
837 | */ | |
838 | ||
839 | if (bp->l_flag & lbmERROR) | |
840 | tblk->flag |= tblkGC_ERROR; | |
841 | ||
842 | /* remove it from the commit queue */ | |
843 | list_del(&tblk->cqueue); | |
844 | tblk->flag &= ~tblkGC_QUEUE; | |
845 | ||
846 | if (tblk == log->flush_tblk) { | |
847 | /* we can stop flushing the log now */ | |
848 | clear_bit(log_FLUSH, &log->flag); | |
849 | log->flush_tblk = NULL; | |
850 | } | |
851 | ||
852 | jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, | |
853 | tblk->flag); | |
854 | ||
855 | if (!(tblk->xflag & COMMIT_FORCE)) | |
856 | /* | |
857 | * Hand tblk over to lazy commit thread | |
858 | */ | |
859 | txLazyUnlock(tblk); | |
860 | else { | |
861 | /* state transition: COMMIT -> COMMITTED */ | |
862 | tblk->flag |= tblkGC_COMMITTED; | |
863 | ||
864 | if (tblk->flag & tblkGC_READY) | |
865 | log->gcrtc--; | |
866 | ||
867 | LOGGC_WAKEUP(tblk); | |
868 | } | |
869 | ||
870 | /* was page full before pageout ? | |
871 | * (and this is the last tblk bound with the page) | |
872 | */ | |
873 | if (tblk->flag & tblkGC_FREE) | |
874 | lbmFree(bp); | |
875 | /* did page become full after pageout ? | |
876 | * (and this is the last tblk bound with the page) | |
877 | */ | |
878 | else if (tblk->flag & tblkGC_EOP) { | |
879 | /* finalize the page */ | |
880 | lp = (struct logpage *) bp->l_ldata; | |
881 | bp->l_ceor = bp->l_eor; | |
882 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
883 | jfs_info("lmPostGC: calling lbmWrite"); | |
884 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, | |
885 | 1); | |
886 | } | |
887 | ||
888 | } | |
889 | ||
890 | /* are there any transactions who have entered lnGroupCommit() | |
891 | * (whose COMMITs are after that of the last log page written. | |
892 | * They are waiting for new group commit (above at (SLEEP 1)) | |
893 | * or lazy transactions are on a full (queued) log page, | |
894 | * select the latest ready transaction as new group leader and | |
895 | * wake her up to lead her group. | |
896 | */ | |
897 | if ((!list_empty(&log->cqueue)) && | |
898 | ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || | |
899 | test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) | |
900 | /* | |
901 | * Call lmGCwrite with new group leader | |
902 | */ | |
903 | lmGCwrite(log, 1); | |
904 | ||
905 | /* no transaction are ready yet (transactions are only just | |
906 | * queued (GC_QUEUE) and not entered for group commit yet). | |
907 | * the first transaction entering group commit | |
908 | * will elect herself as new group leader. | |
909 | */ | |
910 | else | |
911 | log->cflag &= ~logGC_PAGEOUT; | |
912 | ||
913 | //LOGGC_UNLOCK(log); | |
914 | spin_unlock_irqrestore(&log->gclock, flags); | |
915 | return; | |
916 | } | |
917 | ||
918 | /* | |
919 | * NAME: lmLogSync() | |
920 | * | |
921 | * FUNCTION: write log SYNCPT record for specified log | |
922 | * if new sync address is available | |
923 | * (normally the case if sync() is executed by back-ground | |
924 | * process). | |
925 | * if not, explicitly run jfs_blogsync() to initiate | |
926 | * getting of new sync address. | |
927 | * calculate new value of i_nextsync which determines when | |
928 | * this code is called again. | |
929 | * | |
930 | * this is called only from lmLog(). | |
931 | * | |
932 | * PARAMETER: ip - pointer to logs inode. | |
933 | * | |
934 | * RETURN: 0 | |
935 | * | |
936 | * serialization: LOG_LOCK() held on entry/exit | |
937 | */ | |
938 | static int lmLogSync(struct jfs_log * log, int nosyncwait) | |
939 | { | |
940 | int logsize; | |
941 | int written; /* written since last syncpt */ | |
942 | int free; /* free space left available */ | |
943 | int delta; /* additional delta to write normally */ | |
944 | int more; /* additional write granted */ | |
945 | struct lrd lrd; | |
946 | int lsn; | |
947 | struct logsyncblk *lp; | |
948 | ||
949 | /* | |
950 | * forward syncpt | |
951 | */ | |
952 | /* if last sync is same as last syncpt, | |
953 | * invoke sync point forward processing to update sync. | |
954 | */ | |
955 | ||
956 | if (log->sync == log->syncpt) { | |
957 | LOGSYNC_LOCK(log); | |
958 | /* ToDo: push dirty metapages out to disk */ | |
959 | // bmLogSync(log); | |
960 | ||
961 | if (list_empty(&log->synclist)) | |
962 | log->sync = log->lsn; | |
963 | else { | |
964 | lp = list_entry(log->synclist.next, | |
965 | struct logsyncblk, synclist); | |
966 | log->sync = lp->lsn; | |
967 | } | |
968 | LOGSYNC_UNLOCK(log); | |
969 | ||
970 | } | |
971 | ||
972 | /* if sync is different from last syncpt, | |
973 | * write a SYNCPT record with syncpt = sync. | |
974 | * reset syncpt = sync | |
975 | */ | |
976 | if (log->sync != log->syncpt) { | |
977 | struct jfs_sb_info *sbi; | |
978 | ||
979 | /* | |
980 | * We need to make sure all of the "written" metapages | |
981 | * actually make it to disk | |
982 | */ | |
983 | list_for_each_entry(sbi, &log->sb_list, log_list) { | |
984 | if (sbi->flag & JFS_NOINTEGRITY) | |
985 | continue; | |
986 | filemap_fdatawrite(sbi->ipbmap->i_mapping); | |
987 | filemap_fdatawrite(sbi->ipimap->i_mapping); | |
988 | filemap_fdatawrite(sbi->sb->s_bdev->bd_inode->i_mapping); | |
989 | } | |
990 | list_for_each_entry(sbi, &log->sb_list, log_list) { | |
991 | if (sbi->flag & JFS_NOINTEGRITY) | |
992 | continue; | |
993 | filemap_fdatawait(sbi->ipbmap->i_mapping); | |
994 | filemap_fdatawait(sbi->ipimap->i_mapping); | |
995 | filemap_fdatawait(sbi->sb->s_bdev->bd_inode->i_mapping); | |
996 | } | |
997 | ||
998 | lrd.logtid = 0; | |
999 | lrd.backchain = 0; | |
1000 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1001 | lrd.length = 0; | |
1002 | lrd.log.syncpt.sync = cpu_to_le32(log->sync); | |
1003 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1004 | ||
1005 | log->syncpt = log->sync; | |
1006 | } else | |
1007 | lsn = log->lsn; | |
1008 | ||
1009 | /* | |
1010 | * setup next syncpt trigger (SWAG) | |
1011 | */ | |
1012 | logsize = log->logsize; | |
1013 | ||
1014 | logdiff(written, lsn, log); | |
1015 | free = logsize - written; | |
1016 | delta = LOGSYNC_DELTA(logsize); | |
1017 | more = min(free / 2, delta); | |
1018 | if (more < 2 * LOGPSIZE) { | |
1019 | jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); | |
1020 | /* | |
1021 | * log wrapping | |
1022 | * | |
1023 | * option 1 - panic ? No.! | |
1024 | * option 2 - shutdown file systems | |
1025 | * associated with log ? | |
1026 | * option 3 - extend log ? | |
1027 | */ | |
1028 | /* | |
1029 | * option 4 - second chance | |
1030 | * | |
1031 | * mark log wrapped, and continue. | |
1032 | * when all active transactions are completed, | |
1033 | * mark log vaild for recovery. | |
1034 | * if crashed during invalid state, log state | |
1035 | * implies invald log, forcing fsck(). | |
1036 | */ | |
1037 | /* mark log state log wrap in log superblock */ | |
1038 | /* log->state = LOGWRAP; */ | |
1039 | ||
1040 | /* reset sync point computation */ | |
1041 | log->syncpt = log->sync = lsn; | |
1042 | log->nextsync = delta; | |
1043 | } else | |
1044 | /* next syncpt trigger = written + more */ | |
1045 | log->nextsync = written + more; | |
1046 | ||
1047 | /* return if lmLogSync() from outside of transaction, e.g., sync() */ | |
1048 | if (nosyncwait) | |
1049 | return lsn; | |
1050 | ||
1051 | /* if number of bytes written from last sync point is more | |
1052 | * than 1/4 of the log size, stop new transactions from | |
1053 | * starting until all current transactions are completed | |
1054 | * by setting syncbarrier flag. | |
1055 | */ | |
1056 | if (written > LOGSYNC_BARRIER(logsize) && logsize > 32 * LOGPSIZE) { | |
1057 | set_bit(log_SYNCBARRIER, &log->flag); | |
1058 | jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, | |
1059 | log->syncpt); | |
1060 | /* | |
1061 | * We may have to initiate group commit | |
1062 | */ | |
1063 | jfs_flush_journal(log, 0); | |
1064 | } | |
1065 | ||
1066 | return lsn; | |
1067 | } | |
1068 | ||
1069 | ||
1070 | /* | |
1071 | * NAME: lmLogOpen() | |
1072 | * | |
1073 | * FUNCTION: open the log on first open; | |
1074 | * insert filesystem in the active list of the log. | |
1075 | * | |
1076 | * PARAMETER: ipmnt - file system mount inode | |
1077 | * iplog - log inode (out) | |
1078 | * | |
1079 | * RETURN: | |
1080 | * | |
1081 | * serialization: | |
1082 | */ | |
1083 | int lmLogOpen(struct super_block *sb) | |
1084 | { | |
1085 | int rc; | |
1086 | struct block_device *bdev; | |
1087 | struct jfs_log *log; | |
1088 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1089 | ||
1090 | if (sbi->flag & JFS_NOINTEGRITY) | |
1091 | return open_dummy_log(sb); | |
1092 | ||
1093 | if (sbi->mntflag & JFS_INLINELOG) | |
1094 | return open_inline_log(sb); | |
1095 | ||
1096 | down(&jfs_log_sem); | |
1097 | list_for_each_entry(log, &jfs_external_logs, journal_list) { | |
1098 | if (log->bdev->bd_dev == sbi->logdev) { | |
1099 | if (memcmp(log->uuid, sbi->loguuid, | |
1100 | sizeof(log->uuid))) { | |
1101 | jfs_warn("wrong uuid on JFS journal\n"); | |
1102 | up(&jfs_log_sem); | |
1103 | return -EINVAL; | |
1104 | } | |
1105 | /* | |
1106 | * add file system to log active file system list | |
1107 | */ | |
1108 | if ((rc = lmLogFileSystem(log, sbi, 1))) { | |
1109 | up(&jfs_log_sem); | |
1110 | return rc; | |
1111 | } | |
1112 | goto journal_found; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL))) { | |
1117 | up(&jfs_log_sem); | |
1118 | return -ENOMEM; | |
1119 | } | |
1120 | memset(log, 0, sizeof(struct jfs_log)); | |
1121 | INIT_LIST_HEAD(&log->sb_list); | |
1122 | init_waitqueue_head(&log->syncwait); | |
1123 | ||
1124 | /* | |
1125 | * external log as separate logical volume | |
1126 | * | |
1127 | * file systems to log may have n-to-1 relationship; | |
1128 | */ | |
1129 | ||
1130 | bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE); | |
1131 | if (IS_ERR(bdev)) { | |
1132 | rc = -PTR_ERR(bdev); | |
1133 | goto free; | |
1134 | } | |
1135 | ||
1136 | if ((rc = bd_claim(bdev, log))) { | |
1137 | goto close; | |
1138 | } | |
1139 | ||
1140 | log->bdev = bdev; | |
1141 | memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); | |
1142 | ||
1143 | /* | |
1144 | * initialize log: | |
1145 | */ | |
1146 | if ((rc = lmLogInit(log))) | |
1147 | goto unclaim; | |
1148 | ||
1149 | list_add(&log->journal_list, &jfs_external_logs); | |
1150 | ||
1151 | /* | |
1152 | * add file system to log active file system list | |
1153 | */ | |
1154 | if ((rc = lmLogFileSystem(log, sbi, 1))) | |
1155 | goto shutdown; | |
1156 | ||
1157 | journal_found: | |
1158 | LOG_LOCK(log); | |
1159 | list_add(&sbi->log_list, &log->sb_list); | |
1160 | sbi->log = log; | |
1161 | LOG_UNLOCK(log); | |
1162 | ||
1163 | up(&jfs_log_sem); | |
1164 | return 0; | |
1165 | ||
1166 | /* | |
1167 | * unwind on error | |
1168 | */ | |
1169 | shutdown: /* unwind lbmLogInit() */ | |
1170 | list_del(&log->journal_list); | |
1171 | lbmLogShutdown(log); | |
1172 | ||
1173 | unclaim: | |
1174 | bd_release(bdev); | |
1175 | ||
1176 | close: /* close external log device */ | |
1177 | blkdev_put(bdev); | |
1178 | ||
1179 | free: /* free log descriptor */ | |
1180 | up(&jfs_log_sem); | |
1181 | kfree(log); | |
1182 | ||
1183 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1184 | return rc; | |
1185 | } | |
1186 | ||
1187 | static int open_inline_log(struct super_block *sb) | |
1188 | { | |
1189 | struct jfs_log *log; | |
1190 | int rc; | |
1191 | ||
1192 | if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL))) | |
1193 | return -ENOMEM; | |
1194 | memset(log, 0, sizeof(struct jfs_log)); | |
1195 | INIT_LIST_HEAD(&log->sb_list); | |
1196 | init_waitqueue_head(&log->syncwait); | |
1197 | ||
1198 | set_bit(log_INLINELOG, &log->flag); | |
1199 | log->bdev = sb->s_bdev; | |
1200 | log->base = addressPXD(&JFS_SBI(sb)->logpxd); | |
1201 | log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> | |
1202 | (L2LOGPSIZE - sb->s_blocksize_bits); | |
1203 | log->l2bsize = sb->s_blocksize_bits; | |
1204 | ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); | |
1205 | ||
1206 | /* | |
1207 | * initialize log. | |
1208 | */ | |
1209 | if ((rc = lmLogInit(log))) { | |
1210 | kfree(log); | |
1211 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1212 | return rc; | |
1213 | } | |
1214 | ||
1215 | list_add(&JFS_SBI(sb)->log_list, &log->sb_list); | |
1216 | JFS_SBI(sb)->log = log; | |
1217 | ||
1218 | return rc; | |
1219 | } | |
1220 | ||
1221 | static int open_dummy_log(struct super_block *sb) | |
1222 | { | |
1223 | int rc; | |
1224 | ||
1225 | down(&jfs_log_sem); | |
1226 | if (!dummy_log) { | |
1227 | dummy_log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL); | |
1228 | if (!dummy_log) { | |
1229 | up(&jfs_log_sem); | |
1230 | return -ENOMEM; | |
1231 | } | |
1232 | memset(dummy_log, 0, sizeof(struct jfs_log)); | |
1233 | INIT_LIST_HEAD(&dummy_log->sb_list); | |
1234 | init_waitqueue_head(&dummy_log->syncwait); | |
1235 | dummy_log->no_integrity = 1; | |
1236 | /* Make up some stuff */ | |
1237 | dummy_log->base = 0; | |
1238 | dummy_log->size = 1024; | |
1239 | rc = lmLogInit(dummy_log); | |
1240 | if (rc) { | |
1241 | kfree(dummy_log); | |
1242 | dummy_log = NULL; | |
1243 | up(&jfs_log_sem); | |
1244 | return rc; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | LOG_LOCK(dummy_log); | |
1249 | list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); | |
1250 | JFS_SBI(sb)->log = dummy_log; | |
1251 | LOG_UNLOCK(dummy_log); | |
1252 | up(&jfs_log_sem); | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * NAME: lmLogInit() | |
1259 | * | |
1260 | * FUNCTION: log initialization at first log open. | |
1261 | * | |
1262 | * logredo() (or logformat()) should have been run previously. | |
1263 | * initialize the log from log superblock. | |
1264 | * set the log state in the superblock to LOGMOUNT and | |
1265 | * write SYNCPT log record. | |
1266 | * | |
1267 | * PARAMETER: log - log structure | |
1268 | * | |
1269 | * RETURN: 0 - if ok | |
1270 | * -EINVAL - bad log magic number or superblock dirty | |
1271 | * error returned from logwait() | |
1272 | * | |
1273 | * serialization: single first open thread | |
1274 | */ | |
1275 | int lmLogInit(struct jfs_log * log) | |
1276 | { | |
1277 | int rc = 0; | |
1278 | struct lrd lrd; | |
1279 | struct logsuper *logsuper; | |
1280 | struct lbuf *bpsuper; | |
1281 | struct lbuf *bp; | |
1282 | struct logpage *lp; | |
1283 | int lsn = 0; | |
1284 | ||
1285 | jfs_info("lmLogInit: log:0x%p", log); | |
1286 | ||
1287 | /* initialize the group commit serialization lock */ | |
1288 | LOGGC_LOCK_INIT(log); | |
1289 | ||
1290 | /* allocate/initialize the log write serialization lock */ | |
1291 | LOG_LOCK_INIT(log); | |
1292 | ||
1293 | LOGSYNC_LOCK_INIT(log); | |
1294 | ||
1295 | INIT_LIST_HEAD(&log->synclist); | |
1296 | ||
1297 | INIT_LIST_HEAD(&log->cqueue); | |
1298 | log->flush_tblk = NULL; | |
1299 | ||
1300 | log->count = 0; | |
1301 | ||
1302 | /* | |
1303 | * initialize log i/o | |
1304 | */ | |
1305 | if ((rc = lbmLogInit(log))) | |
1306 | return rc; | |
1307 | ||
1308 | if (!test_bit(log_INLINELOG, &log->flag)) | |
1309 | log->l2bsize = L2LOGPSIZE; | |
1310 | ||
1311 | /* check for disabled journaling to disk */ | |
1312 | if (log->no_integrity) { | |
1313 | /* | |
1314 | * Journal pages will still be filled. When the time comes | |
1315 | * to actually do the I/O, the write is not done, and the | |
1316 | * endio routine is called directly. | |
1317 | */ | |
1318 | bp = lbmAllocate(log , 0); | |
1319 | log->bp = bp; | |
1320 | bp->l_pn = bp->l_eor = 0; | |
1321 | } else { | |
1322 | /* | |
1323 | * validate log superblock | |
1324 | */ | |
1325 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1326 | goto errout10; | |
1327 | ||
1328 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1329 | ||
1330 | if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { | |
1331 | jfs_warn("*** Log Format Error ! ***"); | |
1332 | rc = -EINVAL; | |
1333 | goto errout20; | |
1334 | } | |
1335 | ||
1336 | /* logredo() should have been run successfully. */ | |
1337 | if (logsuper->state != cpu_to_le32(LOGREDONE)) { | |
1338 | jfs_warn("*** Log Is Dirty ! ***"); | |
1339 | rc = -EINVAL; | |
1340 | goto errout20; | |
1341 | } | |
1342 | ||
1343 | /* initialize log from log superblock */ | |
1344 | if (test_bit(log_INLINELOG,&log->flag)) { | |
1345 | if (log->size != le32_to_cpu(logsuper->size)) { | |
1346 | rc = -EINVAL; | |
1347 | goto errout20; | |
1348 | } | |
1349 | jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " | |
1350 | "size:0x%x", log, | |
1351 | (unsigned long long) log->base, log->size); | |
1352 | } else { | |
1353 | if (memcmp(logsuper->uuid, log->uuid, 16)) { | |
1354 | jfs_warn("wrong uuid on JFS log device"); | |
1355 | goto errout20; | |
1356 | } | |
1357 | log->size = le32_to_cpu(logsuper->size); | |
1358 | log->l2bsize = le32_to_cpu(logsuper->l2bsize); | |
1359 | jfs_info("lmLogInit: external log:0x%p base:0x%Lx " | |
1360 | "size:0x%x", log, | |
1361 | (unsigned long long) log->base, log->size); | |
1362 | } | |
1363 | ||
1364 | log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; | |
1365 | log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); | |
1366 | ||
1367 | /* | |
1368 | * initialize for log append write mode | |
1369 | */ | |
1370 | /* establish current/end-of-log page/buffer */ | |
1371 | if ((rc = lbmRead(log, log->page, &bp))) | |
1372 | goto errout20; | |
1373 | ||
1374 | lp = (struct logpage *) bp->l_ldata; | |
1375 | ||
1376 | jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", | |
1377 | le32_to_cpu(logsuper->end), log->page, log->eor, | |
1378 | le16_to_cpu(lp->h.eor)); | |
1379 | ||
1380 | log->bp = bp; | |
1381 | bp->l_pn = log->page; | |
1382 | bp->l_eor = log->eor; | |
1383 | ||
1384 | /* if current page is full, move on to next page */ | |
1385 | if (log->eor >= LOGPSIZE - LOGPTLRSIZE) | |
1386 | lmNextPage(log); | |
1387 | ||
1388 | /* | |
1389 | * initialize log syncpoint | |
1390 | */ | |
1391 | /* | |
1392 | * write the first SYNCPT record with syncpoint = 0 | |
1393 | * (i.e., log redo up to HERE !); | |
1394 | * remove current page from lbm write queue at end of pageout | |
1395 | * (to write log superblock update), but do not release to | |
1396 | * freelist; | |
1397 | */ | |
1398 | lrd.logtid = 0; | |
1399 | lrd.backchain = 0; | |
1400 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1401 | lrd.length = 0; | |
1402 | lrd.log.syncpt.sync = 0; | |
1403 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1404 | bp = log->bp; | |
1405 | bp->l_ceor = bp->l_eor; | |
1406 | lp = (struct logpage *) bp->l_ldata; | |
1407 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1408 | lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); | |
1409 | if ((rc = lbmIOWait(bp, 0))) | |
1410 | goto errout30; | |
1411 | ||
1412 | /* | |
1413 | * update/write superblock | |
1414 | */ | |
1415 | logsuper->state = cpu_to_le32(LOGMOUNT); | |
1416 | log->serial = le32_to_cpu(logsuper->serial) + 1; | |
1417 | logsuper->serial = cpu_to_le32(log->serial); | |
1418 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1419 | if ((rc = lbmIOWait(bpsuper, lbmFREE))) | |
1420 | goto errout30; | |
1421 | } | |
1422 | ||
1423 | /* initialize logsync parameters */ | |
1424 | log->logsize = (log->size - 2) << L2LOGPSIZE; | |
1425 | log->lsn = lsn; | |
1426 | log->syncpt = lsn; | |
1427 | log->sync = log->syncpt; | |
1428 | log->nextsync = LOGSYNC_DELTA(log->logsize); | |
1429 | ||
1430 | jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", | |
1431 | log->lsn, log->syncpt, log->sync); | |
1432 | ||
1433 | /* | |
1434 | * initialize for lazy/group commit | |
1435 | */ | |
1436 | log->clsn = lsn; | |
1437 | ||
1438 | return 0; | |
1439 | ||
1440 | /* | |
1441 | * unwind on error | |
1442 | */ | |
1443 | errout30: /* release log page */ | |
1444 | log->wqueue = NULL; | |
1445 | bp->l_wqnext = NULL; | |
1446 | lbmFree(bp); | |
1447 | ||
1448 | errout20: /* release log superblock */ | |
1449 | lbmFree(bpsuper); | |
1450 | ||
1451 | errout10: /* unwind lbmLogInit() */ | |
1452 | lbmLogShutdown(log); | |
1453 | ||
1454 | jfs_warn("lmLogInit: exit(%d)", rc); | |
1455 | return rc; | |
1456 | } | |
1457 | ||
1458 | ||
1459 | /* | |
1460 | * NAME: lmLogClose() | |
1461 | * | |
1462 | * FUNCTION: remove file system <ipmnt> from active list of log <iplog> | |
1463 | * and close it on last close. | |
1464 | * | |
1465 | * PARAMETER: sb - superblock | |
1466 | * | |
1467 | * RETURN: errors from subroutines | |
1468 | * | |
1469 | * serialization: | |
1470 | */ | |
1471 | int lmLogClose(struct super_block *sb) | |
1472 | { | |
1473 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1474 | struct jfs_log *log = sbi->log; | |
1475 | struct block_device *bdev; | |
1476 | int rc = 0; | |
1477 | ||
1478 | jfs_info("lmLogClose: log:0x%p", log); | |
1479 | ||
1480 | down(&jfs_log_sem); | |
1481 | LOG_LOCK(log); | |
1482 | list_del(&sbi->log_list); | |
1483 | LOG_UNLOCK(log); | |
1484 | sbi->log = NULL; | |
1485 | ||
1486 | /* | |
1487 | * We need to make sure all of the "written" metapages | |
1488 | * actually make it to disk | |
1489 | */ | |
1490 | sync_blockdev(sb->s_bdev); | |
1491 | ||
1492 | if (test_bit(log_INLINELOG, &log->flag)) { | |
1493 | /* | |
1494 | * in-line log in host file system | |
1495 | */ | |
1496 | rc = lmLogShutdown(log); | |
1497 | kfree(log); | |
1498 | goto out; | |
1499 | } | |
1500 | ||
1501 | if (!log->no_integrity) | |
1502 | lmLogFileSystem(log, sbi, 0); | |
1503 | ||
1504 | if (!list_empty(&log->sb_list)) | |
1505 | goto out; | |
1506 | ||
1507 | /* | |
1508 | * TODO: ensure that the dummy_log is in a state to allow | |
1509 | * lbmLogShutdown to deallocate all the buffers and call | |
1510 | * kfree against dummy_log. For now, leave dummy_log & its | |
1511 | * buffers in memory, and resuse if another no-integrity mount | |
1512 | * is requested. | |
1513 | */ | |
1514 | if (log->no_integrity) | |
1515 | goto out; | |
1516 | ||
1517 | /* | |
1518 | * external log as separate logical volume | |
1519 | */ | |
1520 | list_del(&log->journal_list); | |
1521 | bdev = log->bdev; | |
1522 | rc = lmLogShutdown(log); | |
1523 | ||
1524 | bd_release(bdev); | |
1525 | blkdev_put(bdev); | |
1526 | ||
1527 | kfree(log); | |
1528 | ||
1529 | out: | |
1530 | up(&jfs_log_sem); | |
1531 | jfs_info("lmLogClose: exit(%d)", rc); | |
1532 | return rc; | |
1533 | } | |
1534 | ||
1535 | ||
1536 | /* | |
1537 | * NAME: jfs_flush_journal() | |
1538 | * | |
1539 | * FUNCTION: initiate write of any outstanding transactions to the journal | |
1540 | * and optionally wait until they are all written to disk | |
1541 | * | |
1542 | * wait == 0 flush until latest txn is committed, don't wait | |
1543 | * wait == 1 flush until latest txn is committed, wait | |
1544 | * wait > 1 flush until all txn's are complete, wait | |
1545 | */ | |
1546 | void jfs_flush_journal(struct jfs_log *log, int wait) | |
1547 | { | |
1548 | int i; | |
1549 | struct tblock *target = NULL; | |
1550 | ||
1551 | /* jfs_write_inode may call us during read-only mount */ | |
1552 | if (!log) | |
1553 | return; | |
1554 | ||
1555 | jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); | |
1556 | ||
1557 | LOGGC_LOCK(log); | |
1558 | ||
1559 | if (!list_empty(&log->cqueue)) { | |
1560 | /* | |
1561 | * This ensures that we will keep writing to the journal as long | |
1562 | * as there are unwritten commit records | |
1563 | */ | |
1564 | target = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
1565 | ||
1566 | if (test_bit(log_FLUSH, &log->flag)) { | |
1567 | /* | |
1568 | * We're already flushing. | |
1569 | * if flush_tblk is NULL, we are flushing everything, | |
1570 | * so leave it that way. Otherwise, update it to the | |
1571 | * latest transaction | |
1572 | */ | |
1573 | if (log->flush_tblk) | |
1574 | log->flush_tblk = target; | |
1575 | } else { | |
1576 | /* Only flush until latest transaction is committed */ | |
1577 | log->flush_tblk = target; | |
1578 | set_bit(log_FLUSH, &log->flag); | |
1579 | ||
1580 | /* | |
1581 | * Initiate I/O on outstanding transactions | |
1582 | */ | |
1583 | if (!(log->cflag & logGC_PAGEOUT)) { | |
1584 | log->cflag |= logGC_PAGEOUT; | |
1585 | lmGCwrite(log, 0); | |
1586 | } | |
1587 | } | |
1588 | } | |
1589 | if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { | |
1590 | /* Flush until all activity complete */ | |
1591 | set_bit(log_FLUSH, &log->flag); | |
1592 | log->flush_tblk = NULL; | |
1593 | } | |
1594 | ||
1595 | if (wait && target && !(target->flag & tblkGC_COMMITTED)) { | |
1596 | DECLARE_WAITQUEUE(__wait, current); | |
1597 | ||
1598 | add_wait_queue(&target->gcwait, &__wait); | |
1599 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1600 | LOGGC_UNLOCK(log); | |
1601 | schedule(); | |
1602 | current->state = TASK_RUNNING; | |
1603 | LOGGC_LOCK(log); | |
1604 | remove_wait_queue(&target->gcwait, &__wait); | |
1605 | } | |
1606 | LOGGC_UNLOCK(log); | |
1607 | ||
1608 | if (wait < 2) | |
1609 | return; | |
1610 | ||
1611 | /* | |
1612 | * If there was recent activity, we may need to wait | |
1613 | * for the lazycommit thread to catch up | |
1614 | */ | |
1615 | if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { | |
1616 | for (i = 0; i < 800; i++) { /* Too much? */ | |
1617 | msleep(250); | |
1618 | if (list_empty(&log->cqueue) && | |
1619 | list_empty(&log->synclist)) | |
1620 | break; | |
1621 | } | |
1622 | } | |
1623 | assert(list_empty(&log->cqueue)); | |
1624 | assert(list_empty(&log->synclist)); | |
1625 | clear_bit(log_FLUSH, &log->flag); | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * NAME: lmLogShutdown() | |
1630 | * | |
1631 | * FUNCTION: log shutdown at last LogClose(). | |
1632 | * | |
1633 | * write log syncpt record. | |
1634 | * update super block to set redone flag to 0. | |
1635 | * | |
1636 | * PARAMETER: log - log inode | |
1637 | * | |
1638 | * RETURN: 0 - success | |
1639 | * | |
1640 | * serialization: single last close thread | |
1641 | */ | |
1642 | int lmLogShutdown(struct jfs_log * log) | |
1643 | { | |
1644 | int rc; | |
1645 | struct lrd lrd; | |
1646 | int lsn; | |
1647 | struct logsuper *logsuper; | |
1648 | struct lbuf *bpsuper; | |
1649 | struct lbuf *bp; | |
1650 | struct logpage *lp; | |
1651 | ||
1652 | jfs_info("lmLogShutdown: log:0x%p", log); | |
1653 | ||
1654 | jfs_flush_journal(log, 2); | |
1655 | ||
1656 | /* | |
1657 | * write the last SYNCPT record with syncpoint = 0 | |
1658 | * (i.e., log redo up to HERE !) | |
1659 | */ | |
1660 | lrd.logtid = 0; | |
1661 | lrd.backchain = 0; | |
1662 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1663 | lrd.length = 0; | |
1664 | lrd.log.syncpt.sync = 0; | |
1665 | ||
1666 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1667 | bp = log->bp; | |
1668 | lp = (struct logpage *) bp->l_ldata; | |
1669 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1670 | lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); | |
1671 | lbmIOWait(log->bp, lbmFREE); | |
1672 | ||
1673 | /* | |
1674 | * synchronous update log superblock | |
1675 | * mark log state as shutdown cleanly | |
1676 | * (i.e., Log does not need to be replayed). | |
1677 | */ | |
1678 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1679 | goto out; | |
1680 | ||
1681 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1682 | logsuper->state = cpu_to_le32(LOGREDONE); | |
1683 | logsuper->end = cpu_to_le32(lsn); | |
1684 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1685 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1686 | ||
1687 | jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", | |
1688 | lsn, log->page, log->eor); | |
1689 | ||
1690 | out: | |
1691 | /* | |
1692 | * shutdown per log i/o | |
1693 | */ | |
1694 | lbmLogShutdown(log); | |
1695 | ||
1696 | if (rc) { | |
1697 | jfs_warn("lmLogShutdown: exit(%d)", rc); | |
1698 | } | |
1699 | return rc; | |
1700 | } | |
1701 | ||
1702 | ||
1703 | /* | |
1704 | * NAME: lmLogFileSystem() | |
1705 | * | |
1706 | * FUNCTION: insert (<activate> = true)/remove (<activate> = false) | |
1707 | * file system into/from log active file system list. | |
1708 | * | |
1709 | * PARAMETE: log - pointer to logs inode. | |
1710 | * fsdev - kdev_t of filesystem. | |
1711 | * serial - pointer to returned log serial number | |
1712 | * activate - insert/remove device from active list. | |
1713 | * | |
1714 | * RETURN: 0 - success | |
1715 | * errors returned by vms_iowait(). | |
1716 | */ | |
1717 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
1718 | int activate) | |
1719 | { | |
1720 | int rc = 0; | |
1721 | int i; | |
1722 | struct logsuper *logsuper; | |
1723 | struct lbuf *bpsuper; | |
1724 | char *uuid = sbi->uuid; | |
1725 | ||
1726 | /* | |
1727 | * insert/remove file system device to log active file system list. | |
1728 | */ | |
1729 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1730 | return rc; | |
1731 | ||
1732 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1733 | if (activate) { | |
1734 | for (i = 0; i < MAX_ACTIVE; i++) | |
1735 | if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { | |
1736 | memcpy(logsuper->active[i].uuid, uuid, 16); | |
1737 | sbi->aggregate = i; | |
1738 | break; | |
1739 | } | |
1740 | if (i == MAX_ACTIVE) { | |
1741 | jfs_warn("Too many file systems sharing journal!"); | |
1742 | lbmFree(bpsuper); | |
1743 | return -EMFILE; /* Is there a better rc? */ | |
1744 | } | |
1745 | } else { | |
1746 | for (i = 0; i < MAX_ACTIVE; i++) | |
1747 | if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { | |
1748 | memcpy(logsuper->active[i].uuid, NULL_UUID, 16); | |
1749 | break; | |
1750 | } | |
1751 | if (i == MAX_ACTIVE) { | |
1752 | jfs_warn("Somebody stomped on the journal!"); | |
1753 | lbmFree(bpsuper); | |
1754 | return -EIO; | |
1755 | } | |
1756 | ||
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * synchronous write log superblock: | |
1761 | * | |
1762 | * write sidestream bypassing write queue: | |
1763 | * at file system mount, log super block is updated for | |
1764 | * activation of the file system before any log record | |
1765 | * (MOUNT record) of the file system, and at file system | |
1766 | * unmount, all meta data for the file system has been | |
1767 | * flushed before log super block is updated for deactivation | |
1768 | * of the file system. | |
1769 | */ | |
1770 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1771 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1772 | ||
1773 | return rc; | |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * log buffer manager (lbm) | |
1778 | * ------------------------ | |
1779 | * | |
1780 | * special purpose buffer manager supporting log i/o requirements. | |
1781 | * | |
1782 | * per log write queue: | |
1783 | * log pageout occurs in serial order by fifo write queue and | |
1784 | * restricting to a single i/o in pregress at any one time. | |
1785 | * a circular singly-linked list | |
1786 | * (log->wrqueue points to the tail, and buffers are linked via | |
1787 | * bp->wrqueue field), and | |
1788 | * maintains log page in pageout ot waiting for pageout in serial pageout. | |
1789 | */ | |
1790 | ||
1791 | /* | |
1792 | * lbmLogInit() | |
1793 | * | |
1794 | * initialize per log I/O setup at lmLogInit() | |
1795 | */ | |
1796 | static int lbmLogInit(struct jfs_log * log) | |
1797 | { /* log inode */ | |
1798 | int i; | |
1799 | struct lbuf *lbuf; | |
1800 | ||
1801 | jfs_info("lbmLogInit: log:0x%p", log); | |
1802 | ||
1803 | /* initialize current buffer cursor */ | |
1804 | log->bp = NULL; | |
1805 | ||
1806 | /* initialize log device write queue */ | |
1807 | log->wqueue = NULL; | |
1808 | ||
1809 | /* | |
1810 | * Each log has its own buffer pages allocated to it. These are | |
1811 | * not managed by the page cache. This ensures that a transaction | |
1812 | * writing to the log does not block trying to allocate a page from | |
1813 | * the page cache (for the log). This would be bad, since page | |
1814 | * allocation waits on the kswapd thread that may be committing inodes | |
1815 | * which would cause log activity. Was that clear? I'm trying to | |
1816 | * avoid deadlock here. | |
1817 | */ | |
1818 | init_waitqueue_head(&log->free_wait); | |
1819 | ||
1820 | log->lbuf_free = NULL; | |
1821 | ||
1822 | for (i = 0; i < LOGPAGES; i++) { | |
1823 | lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); | |
1824 | if (lbuf == 0) | |
1825 | goto error; | |
1826 | lbuf->l_ldata = (char *) get_zeroed_page(GFP_KERNEL); | |
1827 | if (lbuf->l_ldata == 0) { | |
1828 | kfree(lbuf); | |
1829 | goto error; | |
1830 | } | |
1831 | lbuf->l_log = log; | |
1832 | init_waitqueue_head(&lbuf->l_ioevent); | |
1833 | ||
1834 | lbuf->l_freelist = log->lbuf_free; | |
1835 | log->lbuf_free = lbuf; | |
1836 | } | |
1837 | ||
1838 | return (0); | |
1839 | ||
1840 | error: | |
1841 | lbmLogShutdown(log); | |
1842 | return -ENOMEM; | |
1843 | } | |
1844 | ||
1845 | ||
1846 | /* | |
1847 | * lbmLogShutdown() | |
1848 | * | |
1849 | * finalize per log I/O setup at lmLogShutdown() | |
1850 | */ | |
1851 | static void lbmLogShutdown(struct jfs_log * log) | |
1852 | { | |
1853 | struct lbuf *lbuf; | |
1854 | ||
1855 | jfs_info("lbmLogShutdown: log:0x%p", log); | |
1856 | ||
1857 | lbuf = log->lbuf_free; | |
1858 | while (lbuf) { | |
1859 | struct lbuf *next = lbuf->l_freelist; | |
1860 | free_page((unsigned long) lbuf->l_ldata); | |
1861 | kfree(lbuf); | |
1862 | lbuf = next; | |
1863 | } | |
1864 | ||
1865 | log->bp = NULL; | |
1866 | } | |
1867 | ||
1868 | ||
1869 | /* | |
1870 | * lbmAllocate() | |
1871 | * | |
1872 | * allocate an empty log buffer | |
1873 | */ | |
1874 | static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) | |
1875 | { | |
1876 | struct lbuf *bp; | |
1877 | unsigned long flags; | |
1878 | ||
1879 | /* | |
1880 | * recycle from log buffer freelist if any | |
1881 | */ | |
1882 | LCACHE_LOCK(flags); | |
1883 | LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); | |
1884 | log->lbuf_free = bp->l_freelist; | |
1885 | LCACHE_UNLOCK(flags); | |
1886 | ||
1887 | bp->l_flag = 0; | |
1888 | ||
1889 | bp->l_wqnext = NULL; | |
1890 | bp->l_freelist = NULL; | |
1891 | ||
1892 | bp->l_pn = pn; | |
1893 | bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); | |
1894 | bp->l_ceor = 0; | |
1895 | ||
1896 | return bp; | |
1897 | } | |
1898 | ||
1899 | ||
1900 | /* | |
1901 | * lbmFree() | |
1902 | * | |
1903 | * release a log buffer to freelist | |
1904 | */ | |
1905 | static void lbmFree(struct lbuf * bp) | |
1906 | { | |
1907 | unsigned long flags; | |
1908 | ||
1909 | LCACHE_LOCK(flags); | |
1910 | ||
1911 | lbmfree(bp); | |
1912 | ||
1913 | LCACHE_UNLOCK(flags); | |
1914 | } | |
1915 | ||
1916 | static void lbmfree(struct lbuf * bp) | |
1917 | { | |
1918 | struct jfs_log *log = bp->l_log; | |
1919 | ||
1920 | assert(bp->l_wqnext == NULL); | |
1921 | ||
1922 | /* | |
1923 | * return the buffer to head of freelist | |
1924 | */ | |
1925 | bp->l_freelist = log->lbuf_free; | |
1926 | log->lbuf_free = bp; | |
1927 | ||
1928 | wake_up(&log->free_wait); | |
1929 | return; | |
1930 | } | |
1931 | ||
1932 | ||
1933 | /* | |
1934 | * NAME: lbmRedrive | |
1935 | * | |
1936 | * FUNCTION: add a log buffer to the the log redrive list | |
1937 | * | |
1938 | * PARAMETER: | |
1939 | * bp - log buffer | |
1940 | * | |
1941 | * NOTES: | |
1942 | * Takes log_redrive_lock. | |
1943 | */ | |
1944 | static inline void lbmRedrive(struct lbuf *bp) | |
1945 | { | |
1946 | unsigned long flags; | |
1947 | ||
1948 | spin_lock_irqsave(&log_redrive_lock, flags); | |
1949 | bp->l_redrive_next = log_redrive_list; | |
1950 | log_redrive_list = bp; | |
1951 | spin_unlock_irqrestore(&log_redrive_lock, flags); | |
1952 | ||
1953 | wake_up(&jfs_IO_thread_wait); | |
1954 | } | |
1955 | ||
1956 | ||
1957 | /* | |
1958 | * lbmRead() | |
1959 | */ | |
1960 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) | |
1961 | { | |
1962 | struct bio *bio; | |
1963 | struct lbuf *bp; | |
1964 | ||
1965 | /* | |
1966 | * allocate a log buffer | |
1967 | */ | |
1968 | *bpp = bp = lbmAllocate(log, pn); | |
1969 | jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); | |
1970 | ||
1971 | bp->l_flag |= lbmREAD; | |
1972 | ||
1973 | bio = bio_alloc(GFP_NOFS, 1); | |
1974 | ||
1975 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
1976 | bio->bi_bdev = log->bdev; | |
1977 | bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata); | |
1978 | bio->bi_io_vec[0].bv_len = LOGPSIZE; | |
1979 | bio->bi_io_vec[0].bv_offset = 0; | |
1980 | ||
1981 | bio->bi_vcnt = 1; | |
1982 | bio->bi_idx = 0; | |
1983 | bio->bi_size = LOGPSIZE; | |
1984 | ||
1985 | bio->bi_end_io = lbmIODone; | |
1986 | bio->bi_private = bp; | |
1987 | submit_bio(READ_SYNC, bio); | |
1988 | ||
1989 | wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | ||
1995 | /* | |
1996 | * lbmWrite() | |
1997 | * | |
1998 | * buffer at head of pageout queue stays after completion of | |
1999 | * partial-page pageout and redriven by explicit initiation of | |
2000 | * pageout by caller until full-page pageout is completed and | |
2001 | * released. | |
2002 | * | |
2003 | * device driver i/o done redrives pageout of new buffer at | |
2004 | * head of pageout queue when current buffer at head of pageout | |
2005 | * queue is released at the completion of its full-page pageout. | |
2006 | * | |
2007 | * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). | |
2008 | * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() | |
2009 | */ | |
2010 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, | |
2011 | int cant_block) | |
2012 | { | |
2013 | struct lbuf *tail; | |
2014 | unsigned long flags; | |
2015 | ||
2016 | jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); | |
2017 | ||
2018 | /* map the logical block address to physical block address */ | |
2019 | bp->l_blkno = | |
2020 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2021 | ||
2022 | LCACHE_LOCK(flags); /* disable+lock */ | |
2023 | ||
2024 | /* | |
2025 | * initialize buffer for device driver | |
2026 | */ | |
2027 | bp->l_flag = flag; | |
2028 | ||
2029 | /* | |
2030 | * insert bp at tail of write queue associated with log | |
2031 | * | |
2032 | * (request is either for bp already/currently at head of queue | |
2033 | * or new bp to be inserted at tail) | |
2034 | */ | |
2035 | tail = log->wqueue; | |
2036 | ||
2037 | /* is buffer not already on write queue ? */ | |
2038 | if (bp->l_wqnext == NULL) { | |
2039 | /* insert at tail of wqueue */ | |
2040 | if (tail == NULL) { | |
2041 | log->wqueue = bp; | |
2042 | bp->l_wqnext = bp; | |
2043 | } else { | |
2044 | log->wqueue = bp; | |
2045 | bp->l_wqnext = tail->l_wqnext; | |
2046 | tail->l_wqnext = bp; | |
2047 | } | |
2048 | ||
2049 | tail = bp; | |
2050 | } | |
2051 | ||
2052 | /* is buffer at head of wqueue and for write ? */ | |
2053 | if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { | |
2054 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2055 | return; | |
2056 | } | |
2057 | ||
2058 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2059 | ||
2060 | if (cant_block) | |
2061 | lbmRedrive(bp); | |
2062 | else if (flag & lbmSYNC) | |
2063 | lbmStartIO(bp); | |
2064 | else { | |
2065 | LOGGC_UNLOCK(log); | |
2066 | lbmStartIO(bp); | |
2067 | LOGGC_LOCK(log); | |
2068 | } | |
2069 | } | |
2070 | ||
2071 | ||
2072 | /* | |
2073 | * lbmDirectWrite() | |
2074 | * | |
2075 | * initiate pageout bypassing write queue for sidestream | |
2076 | * (e.g., log superblock) write; | |
2077 | */ | |
2078 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) | |
2079 | { | |
2080 | jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", | |
2081 | bp, flag, bp->l_pn); | |
2082 | ||
2083 | /* | |
2084 | * initialize buffer for device driver | |
2085 | */ | |
2086 | bp->l_flag = flag | lbmDIRECT; | |
2087 | ||
2088 | /* map the logical block address to physical block address */ | |
2089 | bp->l_blkno = | |
2090 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2091 | ||
2092 | /* | |
2093 | * initiate pageout of the page | |
2094 | */ | |
2095 | lbmStartIO(bp); | |
2096 | } | |
2097 | ||
2098 | ||
2099 | /* | |
2100 | * NAME: lbmStartIO() | |
2101 | * | |
2102 | * FUNCTION: Interface to DD strategy routine | |
2103 | * | |
2104 | * RETURN: none | |
2105 | * | |
2106 | * serialization: LCACHE_LOCK() is NOT held during log i/o; | |
2107 | */ | |
2108 | static void lbmStartIO(struct lbuf * bp) | |
2109 | { | |
2110 | struct bio *bio; | |
2111 | struct jfs_log *log = bp->l_log; | |
2112 | ||
2113 | jfs_info("lbmStartIO\n"); | |
2114 | ||
2115 | bio = bio_alloc(GFP_NOFS, 1); | |
2116 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
2117 | bio->bi_bdev = log->bdev; | |
2118 | bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata); | |
2119 | bio->bi_io_vec[0].bv_len = LOGPSIZE; | |
2120 | bio->bi_io_vec[0].bv_offset = 0; | |
2121 | ||
2122 | bio->bi_vcnt = 1; | |
2123 | bio->bi_idx = 0; | |
2124 | bio->bi_size = LOGPSIZE; | |
2125 | ||
2126 | bio->bi_end_io = lbmIODone; | |
2127 | bio->bi_private = bp; | |
2128 | ||
2129 | /* check if journaling to disk has been disabled */ | |
2130 | if (!log->no_integrity) { | |
2131 | submit_bio(WRITE_SYNC, bio); | |
2132 | INCREMENT(lmStat.submitted); | |
2133 | } | |
2134 | else { | |
2135 | bio->bi_size = 0; | |
2136 | lbmIODone(bio, 0, 0); /* 2nd argument appears to not be used => 0 | |
2137 | * 3rd argument appears to not be used => 0 | |
2138 | */ | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | ||
2143 | /* | |
2144 | * lbmIOWait() | |
2145 | */ | |
2146 | static int lbmIOWait(struct lbuf * bp, int flag) | |
2147 | { | |
2148 | unsigned long flags; | |
2149 | int rc = 0; | |
2150 | ||
2151 | jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2152 | ||
2153 | LCACHE_LOCK(flags); /* disable+lock */ | |
2154 | ||
2155 | LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); | |
2156 | ||
2157 | rc = (bp->l_flag & lbmERROR) ? -EIO : 0; | |
2158 | ||
2159 | if (flag & lbmFREE) | |
2160 | lbmfree(bp); | |
2161 | ||
2162 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2163 | ||
2164 | jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2165 | return rc; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * lbmIODone() | |
2170 | * | |
2171 | * executed at INTIODONE level | |
2172 | */ | |
2173 | static int lbmIODone(struct bio *bio, unsigned int bytes_done, int error) | |
2174 | { | |
2175 | struct lbuf *bp = bio->bi_private; | |
2176 | struct lbuf *nextbp, *tail; | |
2177 | struct jfs_log *log; | |
2178 | unsigned long flags; | |
2179 | ||
2180 | if (bio->bi_size) | |
2181 | return 1; | |
2182 | ||
2183 | /* | |
2184 | * get back jfs buffer bound to the i/o buffer | |
2185 | */ | |
2186 | jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); | |
2187 | ||
2188 | LCACHE_LOCK(flags); /* disable+lock */ | |
2189 | ||
2190 | bp->l_flag |= lbmDONE; | |
2191 | ||
2192 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2193 | bp->l_flag |= lbmERROR; | |
2194 | ||
2195 | jfs_err("lbmIODone: I/O error in JFS log"); | |
2196 | } | |
2197 | ||
2198 | bio_put(bio); | |
2199 | ||
2200 | /* | |
2201 | * pagein completion | |
2202 | */ | |
2203 | if (bp->l_flag & lbmREAD) { | |
2204 | bp->l_flag &= ~lbmREAD; | |
2205 | ||
2206 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2207 | ||
2208 | /* wakeup I/O initiator */ | |
2209 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * pageout completion | |
2216 | * | |
2217 | * the bp at the head of write queue has completed pageout. | |
2218 | * | |
2219 | * if single-commit/full-page pageout, remove the current buffer | |
2220 | * from head of pageout queue, and redrive pageout with | |
2221 | * the new buffer at head of pageout queue; | |
2222 | * otherwise, the partial-page pageout buffer stays at | |
2223 | * the head of pageout queue to be redriven for pageout | |
2224 | * by lmGroupCommit() until full-page pageout is completed. | |
2225 | */ | |
2226 | bp->l_flag &= ~lbmWRITE; | |
2227 | INCREMENT(lmStat.pagedone); | |
2228 | ||
2229 | /* update committed lsn */ | |
2230 | log = bp->l_log; | |
2231 | log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; | |
2232 | ||
2233 | if (bp->l_flag & lbmDIRECT) { | |
2234 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2235 | LCACHE_UNLOCK(flags); | |
2236 | return 0; | |
2237 | } | |
2238 | ||
2239 | tail = log->wqueue; | |
2240 | ||
2241 | /* single element queue */ | |
2242 | if (bp == tail) { | |
2243 | /* remove head buffer of full-page pageout | |
2244 | * from log device write queue | |
2245 | */ | |
2246 | if (bp->l_flag & lbmRELEASE) { | |
2247 | log->wqueue = NULL; | |
2248 | bp->l_wqnext = NULL; | |
2249 | } | |
2250 | } | |
2251 | /* multi element queue */ | |
2252 | else { | |
2253 | /* remove head buffer of full-page pageout | |
2254 | * from log device write queue | |
2255 | */ | |
2256 | if (bp->l_flag & lbmRELEASE) { | |
2257 | nextbp = tail->l_wqnext = bp->l_wqnext; | |
2258 | bp->l_wqnext = NULL; | |
2259 | ||
2260 | /* | |
2261 | * redrive pageout of next page at head of write queue: | |
2262 | * redrive next page without any bound tblk | |
2263 | * (i.e., page w/o any COMMIT records), or | |
2264 | * first page of new group commit which has been | |
2265 | * queued after current page (subsequent pageout | |
2266 | * is performed synchronously, except page without | |
2267 | * any COMMITs) by lmGroupCommit() as indicated | |
2268 | * by lbmWRITE flag; | |
2269 | */ | |
2270 | if (nextbp->l_flag & lbmWRITE) { | |
2271 | /* | |
2272 | * We can't do the I/O at interrupt time. | |
2273 | * The jfsIO thread can do it | |
2274 | */ | |
2275 | lbmRedrive(nextbp); | |
2276 | } | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | /* | |
2281 | * synchronous pageout: | |
2282 | * | |
2283 | * buffer has not necessarily been removed from write queue | |
2284 | * (e.g., synchronous write of partial-page with COMMIT): | |
2285 | * leave buffer for i/o initiator to dispose | |
2286 | */ | |
2287 | if (bp->l_flag & lbmSYNC) { | |
2288 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2289 | ||
2290 | /* wakeup I/O initiator */ | |
2291 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2292 | } | |
2293 | ||
2294 | /* | |
2295 | * Group Commit pageout: | |
2296 | */ | |
2297 | else if (bp->l_flag & lbmGC) { | |
2298 | LCACHE_UNLOCK(flags); | |
2299 | lmPostGC(bp); | |
2300 | } | |
2301 | ||
2302 | /* | |
2303 | * asynchronous pageout: | |
2304 | * | |
2305 | * buffer must have been removed from write queue: | |
2306 | * insert buffer at head of freelist where it can be recycled | |
2307 | */ | |
2308 | else { | |
2309 | assert(bp->l_flag & lbmRELEASE); | |
2310 | assert(bp->l_flag & lbmFREE); | |
2311 | lbmfree(bp); | |
2312 | ||
2313 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2314 | } | |
2315 | ||
2316 | return 0; | |
2317 | } | |
2318 | ||
2319 | int jfsIOWait(void *arg) | |
2320 | { | |
2321 | struct lbuf *bp; | |
2322 | ||
2323 | daemonize("jfsIO"); | |
2324 | ||
2325 | complete(&jfsIOwait); | |
2326 | ||
2327 | do { | |
2328 | DECLARE_WAITQUEUE(wq, current); | |
2329 | ||
2330 | spin_lock_irq(&log_redrive_lock); | |
2331 | while ((bp = log_redrive_list) != 0) { | |
2332 | log_redrive_list = bp->l_redrive_next; | |
2333 | bp->l_redrive_next = NULL; | |
2334 | spin_unlock_irq(&log_redrive_lock); | |
2335 | lbmStartIO(bp); | |
2336 | spin_lock_irq(&log_redrive_lock); | |
2337 | } | |
2338 | if (current->flags & PF_FREEZE) { | |
2339 | spin_unlock_irq(&log_redrive_lock); | |
2340 | refrigerator(PF_FREEZE); | |
2341 | } else { | |
2342 | add_wait_queue(&jfs_IO_thread_wait, &wq); | |
2343 | set_current_state(TASK_INTERRUPTIBLE); | |
2344 | spin_unlock_irq(&log_redrive_lock); | |
2345 | schedule(); | |
2346 | current->state = TASK_RUNNING; | |
2347 | remove_wait_queue(&jfs_IO_thread_wait, &wq); | |
2348 | } | |
2349 | } while (!jfs_stop_threads); | |
2350 | ||
2351 | jfs_info("jfsIOWait being killed!"); | |
2352 | complete_and_exit(&jfsIOwait, 0); | |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * NAME: lmLogFormat()/jfs_logform() | |
2357 | * | |
2358 | * FUNCTION: format file system log | |
2359 | * | |
2360 | * PARAMETERS: | |
2361 | * log - volume log | |
2362 | * logAddress - start address of log space in FS block | |
2363 | * logSize - length of log space in FS block; | |
2364 | * | |
2365 | * RETURN: 0 - success | |
2366 | * -EIO - i/o error | |
2367 | * | |
2368 | * XXX: We're synchronously writing one page at a time. This needs to | |
2369 | * be improved by writing multiple pages at once. | |
2370 | */ | |
2371 | int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) | |
2372 | { | |
2373 | int rc = -EIO; | |
2374 | struct jfs_sb_info *sbi; | |
2375 | struct logsuper *logsuper; | |
2376 | struct logpage *lp; | |
2377 | int lspn; /* log sequence page number */ | |
2378 | struct lrd *lrd_ptr; | |
2379 | int npages = 0; | |
2380 | struct lbuf *bp; | |
2381 | ||
2382 | jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", | |
2383 | (long long)logAddress, logSize); | |
2384 | ||
2385 | sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); | |
2386 | ||
2387 | /* allocate a log buffer */ | |
2388 | bp = lbmAllocate(log, 1); | |
2389 | ||
2390 | npages = logSize >> sbi->l2nbperpage; | |
2391 | ||
2392 | /* | |
2393 | * log space: | |
2394 | * | |
2395 | * page 0 - reserved; | |
2396 | * page 1 - log superblock; | |
2397 | * page 2 - log data page: A SYNC log record is written | |
2398 | * into this page at logform time; | |
2399 | * pages 3-N - log data page: set to empty log data pages; | |
2400 | */ | |
2401 | /* | |
2402 | * init log superblock: log page 1 | |
2403 | */ | |
2404 | logsuper = (struct logsuper *) bp->l_ldata; | |
2405 | ||
2406 | logsuper->magic = cpu_to_le32(LOGMAGIC); | |
2407 | logsuper->version = cpu_to_le32(LOGVERSION); | |
2408 | logsuper->state = cpu_to_le32(LOGREDONE); | |
2409 | logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ | |
2410 | logsuper->size = cpu_to_le32(npages); | |
2411 | logsuper->bsize = cpu_to_le32(sbi->bsize); | |
2412 | logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); | |
2413 | logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); | |
2414 | ||
2415 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2416 | bp->l_blkno = logAddress + sbi->nbperpage; | |
2417 | lbmStartIO(bp); | |
2418 | if ((rc = lbmIOWait(bp, 0))) | |
2419 | goto exit; | |
2420 | ||
2421 | /* | |
2422 | * init pages 2 to npages-1 as log data pages: | |
2423 | * | |
2424 | * log page sequence number (lpsn) initialization: | |
2425 | * | |
2426 | * pn: 0 1 2 3 n-1 | |
2427 | * +-----+-----+=====+=====+===.....===+=====+ | |
2428 | * lspn: N-1 0 1 N-2 | |
2429 | * <--- N page circular file ----> | |
2430 | * | |
2431 | * the N (= npages-2) data pages of the log is maintained as | |
2432 | * a circular file for the log records; | |
2433 | * lpsn grows by 1 monotonically as each log page is written | |
2434 | * to the circular file of the log; | |
2435 | * and setLogpage() will not reset the page number even if | |
2436 | * the eor is equal to LOGPHDRSIZE. In order for binary search | |
2437 | * still work in find log end process, we have to simulate the | |
2438 | * log wrap situation at the log format time. | |
2439 | * The 1st log page written will have the highest lpsn. Then | |
2440 | * the succeeding log pages will have ascending order of | |
2441 | * the lspn starting from 0, ... (N-2) | |
2442 | */ | |
2443 | lp = (struct logpage *) bp->l_ldata; | |
2444 | /* | |
2445 | * initialize 1st log page to be written: lpsn = N - 1, | |
2446 | * write a SYNCPT log record is written to this page | |
2447 | */ | |
2448 | lp->h.page = lp->t.page = cpu_to_le32(npages - 3); | |
2449 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); | |
2450 | ||
2451 | lrd_ptr = (struct lrd *) &lp->data; | |
2452 | lrd_ptr->logtid = 0; | |
2453 | lrd_ptr->backchain = 0; | |
2454 | lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); | |
2455 | lrd_ptr->length = 0; | |
2456 | lrd_ptr->log.syncpt.sync = 0; | |
2457 | ||
2458 | bp->l_blkno += sbi->nbperpage; | |
2459 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2460 | lbmStartIO(bp); | |
2461 | if ((rc = lbmIOWait(bp, 0))) | |
2462 | goto exit; | |
2463 | ||
2464 | /* | |
2465 | * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) | |
2466 | */ | |
2467 | for (lspn = 0; lspn < npages - 3; lspn++) { | |
2468 | lp->h.page = lp->t.page = cpu_to_le32(lspn); | |
2469 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
2470 | ||
2471 | bp->l_blkno += sbi->nbperpage; | |
2472 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2473 | lbmStartIO(bp); | |
2474 | if ((rc = lbmIOWait(bp, 0))) | |
2475 | goto exit; | |
2476 | } | |
2477 | ||
2478 | rc = 0; | |
2479 | exit: | |
2480 | /* | |
2481 | * finalize log | |
2482 | */ | |
2483 | /* release the buffer */ | |
2484 | lbmFree(bp); | |
2485 | ||
2486 | return rc; | |
2487 | } | |
2488 | ||
2489 | #ifdef CONFIG_JFS_STATISTICS | |
2490 | int jfs_lmstats_read(char *buffer, char **start, off_t offset, int length, | |
2491 | int *eof, void *data) | |
2492 | { | |
2493 | int len = 0; | |
2494 | off_t begin; | |
2495 | ||
2496 | len += sprintf(buffer, | |
2497 | "JFS Logmgr stats\n" | |
2498 | "================\n" | |
2499 | "commits = %d\n" | |
2500 | "writes submitted = %d\n" | |
2501 | "writes completed = %d\n" | |
2502 | "full pages submitted = %d\n" | |
2503 | "partial pages submitted = %d\n", | |
2504 | lmStat.commit, | |
2505 | lmStat.submitted, | |
2506 | lmStat.pagedone, | |
2507 | lmStat.full_page, | |
2508 | lmStat.partial_page); | |
2509 | ||
2510 | begin = offset; | |
2511 | *start = buffer + begin; | |
2512 | len -= begin; | |
2513 | ||
2514 | if (len > length) | |
2515 | len = length; | |
2516 | else | |
2517 | *eof = 1; | |
2518 | ||
2519 | if (len < 0) | |
2520 | len = 0; | |
2521 | ||
2522 | return len; | |
2523 | } | |
2524 | #endif /* CONFIG_JFS_STATISTICS */ |