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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 | |
63f83c9f | 7 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 8 | * (at your option) any later version. |
63f83c9f | 9 | * |
1da177e4 LT |
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 | |
63f83c9f | 16 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
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> | |
1da177e4 | 65 | #include <linux/completion.h> |
91dbb4de | 66 | #include <linux/kthread.h> |
1da177e4 LT |
67 | #include <linux/buffer_head.h> /* for sync_blockdev() */ |
68 | #include <linux/bio.h> | |
7dfb7103 | 69 | #include <linux/freezer.h> |
1da177e4 | 70 | #include <linux/delay.h> |
353ab6e9 | 71 | #include <linux/mutex.h> |
1da177e4 LT |
72 | #include "jfs_incore.h" |
73 | #include "jfs_filsys.h" | |
74 | #include "jfs_metapage.h" | |
1868f4aa | 75 | #include "jfs_superblock.h" |
1da177e4 LT |
76 | #include "jfs_txnmgr.h" |
77 | #include "jfs_debug.h" | |
78 | ||
79 | ||
80 | /* | |
81 | * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) | |
82 | */ | |
83 | static struct lbuf *log_redrive_list; | |
84 | static DEFINE_SPINLOCK(log_redrive_lock); | |
1da177e4 LT |
85 | |
86 | ||
87 | /* | |
88 | * log read/write serialization (per log) | |
89 | */ | |
1de87444 IM |
90 | #define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) |
91 | #define LOG_LOCK(log) mutex_lock(&((log)->loglock)) | |
92 | #define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock)) | |
1da177e4 LT |
93 | |
94 | ||
95 | /* | |
96 | * log group commit serialization (per log) | |
97 | */ | |
98 | ||
99 | #define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) | |
100 | #define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) | |
101 | #define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) | |
102 | #define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) | |
103 | ||
104 | /* | |
105 | * log sync serialization (per log) | |
106 | */ | |
107 | #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) | |
108 | #define LOGSYNC_BARRIER(logsize) ((logsize)/4) | |
109 | /* | |
110 | #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) | |
111 | #define LOGSYNC_BARRIER(logsize) ((logsize)/2) | |
112 | */ | |
113 | ||
114 | ||
115 | /* | |
116 | * log buffer cache synchronization | |
117 | */ | |
118 | static DEFINE_SPINLOCK(jfsLCacheLock); | |
119 | ||
120 | #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) | |
121 | #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) | |
122 | ||
123 | /* | |
124 | * See __SLEEP_COND in jfs_locks.h | |
125 | */ | |
126 | #define LCACHE_SLEEP_COND(wq, cond, flags) \ | |
127 | do { \ | |
128 | if (cond) \ | |
129 | break; \ | |
130 | __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ | |
131 | } while (0) | |
132 | ||
133 | #define LCACHE_WAKEUP(event) wake_up(event) | |
134 | ||
135 | ||
136 | /* | |
137 | * lbuf buffer cache (lCache) control | |
138 | */ | |
139 | /* log buffer manager pageout control (cumulative, inclusive) */ | |
140 | #define lbmREAD 0x0001 | |
141 | #define lbmWRITE 0x0002 /* enqueue at tail of write queue; | |
142 | * init pageout if at head of queue; | |
143 | */ | |
144 | #define lbmRELEASE 0x0004 /* remove from write queue | |
145 | * at completion of pageout; | |
146 | * do not free/recycle it yet: | |
147 | * caller will free it; | |
148 | */ | |
149 | #define lbmSYNC 0x0008 /* do not return to freelist | |
150 | * when removed from write queue; | |
151 | */ | |
152 | #define lbmFREE 0x0010 /* return to freelist | |
153 | * at completion of pageout; | |
154 | * the buffer may be recycled; | |
155 | */ | |
156 | #define lbmDONE 0x0020 | |
157 | #define lbmERROR 0x0040 | |
158 | #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing | |
159 | * of log page | |
160 | */ | |
161 | #define lbmDIRECT 0x0100 | |
162 | ||
163 | /* | |
164 | * Global list of active external journals | |
165 | */ | |
166 | static LIST_HEAD(jfs_external_logs); | |
167 | static struct jfs_log *dummy_log = NULL; | |
353ab6e9 | 168 | static DEFINE_MUTEX(jfs_log_mutex); |
1da177e4 | 169 | |
1da177e4 LT |
170 | /* |
171 | * forward references | |
172 | */ | |
173 | static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, | |
174 | struct lrd * lrd, struct tlock * tlck); | |
175 | ||
176 | static int lmNextPage(struct jfs_log * log); | |
177 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
178 | int activate); | |
179 | ||
180 | static int open_inline_log(struct super_block *sb); | |
181 | static int open_dummy_log(struct super_block *sb); | |
182 | static int lbmLogInit(struct jfs_log * log); | |
183 | static void lbmLogShutdown(struct jfs_log * log); | |
184 | static struct lbuf *lbmAllocate(struct jfs_log * log, int); | |
185 | static void lbmFree(struct lbuf * bp); | |
186 | static void lbmfree(struct lbuf * bp); | |
187 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); | |
188 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); | |
189 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); | |
190 | static int lbmIOWait(struct lbuf * bp, int flag); | |
191 | static bio_end_io_t lbmIODone; | |
192 | static void lbmStartIO(struct lbuf * bp); | |
193 | static void lmGCwrite(struct jfs_log * log, int cant_block); | |
cbc3d65e | 194 | static int lmLogSync(struct jfs_log * log, int hard_sync); |
1da177e4 LT |
195 | |
196 | ||
197 | ||
198 | /* | |
199 | * statistics | |
200 | */ | |
201 | #ifdef CONFIG_JFS_STATISTICS | |
202 | static struct lmStat { | |
203 | uint commit; /* # of commit */ | |
204 | uint pagedone; /* # of page written */ | |
205 | uint submitted; /* # of pages submitted */ | |
206 | uint full_page; /* # of full pages submitted */ | |
207 | uint partial_page; /* # of partial pages submitted */ | |
208 | } lmStat; | |
209 | #endif | |
210 | ||
67e6682f DK |
211 | static void write_special_inodes(struct jfs_log *log, |
212 | int (*writer)(struct address_space *)) | |
213 | { | |
214 | struct jfs_sb_info *sbi; | |
215 | ||
216 | list_for_each_entry(sbi, &log->sb_list, log_list) { | |
217 | writer(sbi->ipbmap->i_mapping); | |
218 | writer(sbi->ipimap->i_mapping); | |
219 | writer(sbi->direct_inode->i_mapping); | |
220 | } | |
221 | } | |
1da177e4 LT |
222 | |
223 | /* | |
224 | * NAME: lmLog() | |
225 | * | |
226 | * FUNCTION: write a log record; | |
227 | * | |
228 | * PARAMETER: | |
229 | * | |
230 | * RETURN: lsn - offset to the next log record to write (end-of-log); | |
231 | * -1 - error; | |
232 | * | |
233 | * note: todo: log error handler | |
234 | */ | |
235 | int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
236 | struct tlock * tlck) | |
237 | { | |
238 | int lsn; | |
239 | int diffp, difft; | |
240 | struct metapage *mp = NULL; | |
7fab479b | 241 | unsigned long flags; |
1da177e4 LT |
242 | |
243 | jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", | |
244 | log, tblk, lrd, tlck); | |
245 | ||
246 | LOG_LOCK(log); | |
247 | ||
248 | /* log by (out-of-transaction) JFS ? */ | |
249 | if (tblk == NULL) | |
250 | goto writeRecord; | |
251 | ||
252 | /* log from page ? */ | |
253 | if (tlck == NULL || | |
254 | tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) | |
255 | goto writeRecord; | |
256 | ||
257 | /* | |
f720e3ba | 258 | * initialize/update page/transaction recovery lsn |
1da177e4 LT |
259 | */ |
260 | lsn = log->lsn; | |
261 | ||
7fab479b | 262 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * initialize page lsn if first log write of the page | |
266 | */ | |
267 | if (mp->lsn == 0) { | |
268 | mp->log = log; | |
269 | mp->lsn = lsn; | |
270 | log->count++; | |
271 | ||
272 | /* insert page at tail of logsynclist */ | |
273 | list_add_tail(&mp->synclist, &log->synclist); | |
274 | } | |
275 | ||
276 | /* | |
f720e3ba | 277 | * initialize/update lsn of tblock of the page |
1da177e4 LT |
278 | * |
279 | * transaction inherits oldest lsn of pages associated | |
280 | * with allocation/deallocation of resources (their | |
281 | * log records are used to reconstruct allocation map | |
282 | * at recovery time: inode for inode allocation map, | |
283 | * B+-tree index of extent descriptors for block | |
284 | * allocation map); | |
285 | * allocation map pages inherit transaction lsn at | |
286 | * commit time to allow forwarding log syncpt past log | |
287 | * records associated with allocation/deallocation of | |
288 | * resources only after persistent map of these map pages | |
289 | * have been updated and propagated to home. | |
290 | */ | |
291 | /* | |
292 | * initialize transaction lsn: | |
293 | */ | |
294 | if (tblk->lsn == 0) { | |
295 | /* inherit lsn of its first page logged */ | |
296 | tblk->lsn = mp->lsn; | |
297 | log->count++; | |
298 | ||
299 | /* insert tblock after the page on logsynclist */ | |
300 | list_add(&tblk->synclist, &mp->synclist); | |
301 | } | |
302 | /* | |
303 | * update transaction lsn: | |
304 | */ | |
305 | else { | |
306 | /* inherit oldest/smallest lsn of page */ | |
307 | logdiff(diffp, mp->lsn, log); | |
308 | logdiff(difft, tblk->lsn, log); | |
309 | if (diffp < difft) { | |
310 | /* update tblock lsn with page lsn */ | |
311 | tblk->lsn = mp->lsn; | |
312 | ||
313 | /* move tblock after page on logsynclist */ | |
314 | list_move(&tblk->synclist, &mp->synclist); | |
315 | } | |
316 | } | |
317 | ||
7fab479b | 318 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
319 | |
320 | /* | |
f720e3ba | 321 | * write the log record |
1da177e4 LT |
322 | */ |
323 | writeRecord: | |
324 | lsn = lmWriteRecord(log, tblk, lrd, tlck); | |
325 | ||
326 | /* | |
327 | * forward log syncpt if log reached next syncpt trigger | |
328 | */ | |
329 | logdiff(diffp, lsn, log); | |
330 | if (diffp >= log->nextsync) | |
331 | lsn = lmLogSync(log, 0); | |
332 | ||
333 | /* update end-of-log lsn */ | |
334 | log->lsn = lsn; | |
335 | ||
336 | LOG_UNLOCK(log); | |
337 | ||
338 | /* return end-of-log address */ | |
339 | return lsn; | |
340 | } | |
341 | ||
1da177e4 LT |
342 | /* |
343 | * NAME: lmWriteRecord() | |
344 | * | |
345 | * FUNCTION: move the log record to current log page | |
346 | * | |
347 | * PARAMETER: cd - commit descriptor | |
348 | * | |
349 | * RETURN: end-of-log address | |
63f83c9f | 350 | * |
1da177e4 LT |
351 | * serialization: LOG_LOCK() held on entry/exit |
352 | */ | |
353 | static int | |
354 | lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
355 | struct tlock * tlck) | |
356 | { | |
357 | int lsn = 0; /* end-of-log address */ | |
358 | struct lbuf *bp; /* dst log page buffer */ | |
359 | struct logpage *lp; /* dst log page */ | |
360 | caddr_t dst; /* destination address in log page */ | |
361 | int dstoffset; /* end-of-log offset in log page */ | |
362 | int freespace; /* free space in log page */ | |
363 | caddr_t p; /* src meta-data page */ | |
364 | caddr_t src; | |
365 | int srclen; | |
366 | int nbytes; /* number of bytes to move */ | |
367 | int i; | |
368 | int len; | |
369 | struct linelock *linelock; | |
370 | struct lv *lv; | |
371 | struct lvd *lvd; | |
372 | int l2linesize; | |
373 | ||
374 | len = 0; | |
375 | ||
376 | /* retrieve destination log page to write */ | |
377 | bp = (struct lbuf *) log->bp; | |
378 | lp = (struct logpage *) bp->l_ldata; | |
379 | dstoffset = log->eor; | |
380 | ||
381 | /* any log data to write ? */ | |
382 | if (tlck == NULL) | |
383 | goto moveLrd; | |
384 | ||
385 | /* | |
f720e3ba | 386 | * move log record data |
1da177e4 LT |
387 | */ |
388 | /* retrieve source meta-data page to log */ | |
389 | if (tlck->flag & tlckPAGELOCK) { | |
390 | p = (caddr_t) (tlck->mp->data); | |
391 | linelock = (struct linelock *) & tlck->lock; | |
392 | } | |
393 | /* retrieve source in-memory inode to log */ | |
394 | else if (tlck->flag & tlckINODELOCK) { | |
395 | if (tlck->type & tlckDTREE) | |
396 | p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; | |
397 | else | |
398 | p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; | |
399 | linelock = (struct linelock *) & tlck->lock; | |
400 | } | |
401 | #ifdef _JFS_WIP | |
402 | else if (tlck->flag & tlckINLINELOCK) { | |
403 | ||
404 | inlinelock = (struct inlinelock *) & tlck; | |
405 | p = (caddr_t) & inlinelock->pxd; | |
406 | linelock = (struct linelock *) & tlck; | |
407 | } | |
408 | #endif /* _JFS_WIP */ | |
409 | else { | |
410 | jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); | |
411 | return 0; /* Probably should trap */ | |
412 | } | |
413 | l2linesize = linelock->l2linesize; | |
414 | ||
415 | moveData: | |
416 | ASSERT(linelock->index <= linelock->maxcnt); | |
417 | ||
418 | lv = linelock->lv; | |
419 | for (i = 0; i < linelock->index; i++, lv++) { | |
420 | if (lv->length == 0) | |
421 | continue; | |
422 | ||
423 | /* is page full ? */ | |
424 | if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { | |
425 | /* page become full: move on to next page */ | |
426 | lmNextPage(log); | |
427 | ||
428 | bp = log->bp; | |
429 | lp = (struct logpage *) bp->l_ldata; | |
430 | dstoffset = LOGPHDRSIZE; | |
431 | } | |
432 | ||
433 | /* | |
434 | * move log vector data | |
435 | */ | |
436 | src = (u8 *) p + (lv->offset << l2linesize); | |
437 | srclen = lv->length << l2linesize; | |
438 | len += srclen; | |
439 | while (srclen > 0) { | |
440 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
441 | nbytes = min(freespace, srclen); | |
442 | dst = (caddr_t) lp + dstoffset; | |
443 | memcpy(dst, src, nbytes); | |
444 | dstoffset += nbytes; | |
445 | ||
446 | /* is page not full ? */ | |
447 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
448 | break; | |
449 | ||
450 | /* page become full: move on to next page */ | |
451 | lmNextPage(log); | |
452 | ||
453 | bp = (struct lbuf *) log->bp; | |
454 | lp = (struct logpage *) bp->l_ldata; | |
455 | dstoffset = LOGPHDRSIZE; | |
456 | ||
457 | srclen -= nbytes; | |
458 | src += nbytes; | |
459 | } | |
460 | ||
461 | /* | |
462 | * move log vector descriptor | |
463 | */ | |
464 | len += 4; | |
465 | lvd = (struct lvd *) ((caddr_t) lp + dstoffset); | |
466 | lvd->offset = cpu_to_le16(lv->offset); | |
467 | lvd->length = cpu_to_le16(lv->length); | |
468 | dstoffset += 4; | |
469 | jfs_info("lmWriteRecord: lv offset:%d length:%d", | |
470 | lv->offset, lv->length); | |
471 | } | |
472 | ||
473 | if ((i = linelock->next)) { | |
474 | linelock = (struct linelock *) lid_to_tlock(i); | |
475 | goto moveData; | |
476 | } | |
477 | ||
478 | /* | |
f720e3ba | 479 | * move log record descriptor |
1da177e4 LT |
480 | */ |
481 | moveLrd: | |
482 | lrd->length = cpu_to_le16(len); | |
483 | ||
484 | src = (caddr_t) lrd; | |
485 | srclen = LOGRDSIZE; | |
486 | ||
487 | while (srclen > 0) { | |
488 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
489 | nbytes = min(freespace, srclen); | |
490 | dst = (caddr_t) lp + dstoffset; | |
491 | memcpy(dst, src, nbytes); | |
492 | ||
493 | dstoffset += nbytes; | |
494 | srclen -= nbytes; | |
495 | ||
496 | /* are there more to move than freespace of page ? */ | |
497 | if (srclen) | |
498 | goto pageFull; | |
499 | ||
500 | /* | |
501 | * end of log record descriptor | |
502 | */ | |
503 | ||
504 | /* update last log record eor */ | |
505 | log->eor = dstoffset; | |
506 | bp->l_eor = dstoffset; | |
507 | lsn = (log->page << L2LOGPSIZE) + dstoffset; | |
508 | ||
509 | if (lrd->type & cpu_to_le16(LOG_COMMIT)) { | |
510 | tblk->clsn = lsn; | |
511 | jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, | |
512 | bp->l_eor); | |
513 | ||
514 | INCREMENT(lmStat.commit); /* # of commit */ | |
515 | ||
516 | /* | |
517 | * enqueue tblock for group commit: | |
518 | * | |
519 | * enqueue tblock of non-trivial/synchronous COMMIT | |
520 | * at tail of group commit queue | |
521 | * (trivial/asynchronous COMMITs are ignored by | |
522 | * group commit.) | |
523 | */ | |
524 | LOGGC_LOCK(log); | |
525 | ||
526 | /* init tblock gc state */ | |
527 | tblk->flag = tblkGC_QUEUE; | |
528 | tblk->bp = log->bp; | |
529 | tblk->pn = log->page; | |
530 | tblk->eor = log->eor; | |
531 | ||
532 | /* enqueue transaction to commit queue */ | |
533 | list_add_tail(&tblk->cqueue, &log->cqueue); | |
534 | ||
535 | LOGGC_UNLOCK(log); | |
536 | } | |
537 | ||
538 | jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", | |
539 | le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); | |
540 | ||
541 | /* page not full ? */ | |
542 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
543 | return lsn; | |
544 | ||
545 | pageFull: | |
546 | /* page become full: move on to next page */ | |
547 | lmNextPage(log); | |
548 | ||
549 | bp = (struct lbuf *) log->bp; | |
550 | lp = (struct logpage *) bp->l_ldata; | |
551 | dstoffset = LOGPHDRSIZE; | |
552 | src += nbytes; | |
553 | } | |
554 | ||
555 | return lsn; | |
556 | } | |
557 | ||
558 | ||
559 | /* | |
560 | * NAME: lmNextPage() | |
561 | * | |
562 | * FUNCTION: write current page and allocate next page. | |
563 | * | |
564 | * PARAMETER: log | |
565 | * | |
566 | * RETURN: 0 | |
63f83c9f | 567 | * |
1da177e4 LT |
568 | * serialization: LOG_LOCK() held on entry/exit |
569 | */ | |
570 | static int lmNextPage(struct jfs_log * log) | |
571 | { | |
572 | struct logpage *lp; | |
573 | int lspn; /* log sequence page number */ | |
574 | int pn; /* current page number */ | |
575 | struct lbuf *bp; | |
576 | struct lbuf *nextbp; | |
577 | struct tblock *tblk; | |
578 | ||
579 | /* get current log page number and log sequence page number */ | |
580 | pn = log->page; | |
581 | bp = log->bp; | |
582 | lp = (struct logpage *) bp->l_ldata; | |
583 | lspn = le32_to_cpu(lp->h.page); | |
584 | ||
585 | LOGGC_LOCK(log); | |
586 | ||
587 | /* | |
f720e3ba | 588 | * write or queue the full page at the tail of write queue |
1da177e4 LT |
589 | */ |
590 | /* get the tail tblk on commit queue */ | |
591 | if (list_empty(&log->cqueue)) | |
592 | tblk = NULL; | |
593 | else | |
594 | tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
595 | ||
596 | /* every tblk who has COMMIT record on the current page, | |
597 | * and has not been committed, must be on commit queue | |
598 | * since tblk is queued at commit queueu at the time | |
599 | * of writing its COMMIT record on the page before | |
600 | * page becomes full (even though the tblk thread | |
601 | * who wrote COMMIT record may have been suspended | |
602 | * currently); | |
603 | */ | |
604 | ||
605 | /* is page bound with outstanding tail tblk ? */ | |
606 | if (tblk && tblk->pn == pn) { | |
607 | /* mark tblk for end-of-page */ | |
608 | tblk->flag |= tblkGC_EOP; | |
609 | ||
610 | if (log->cflag & logGC_PAGEOUT) { | |
611 | /* if page is not already on write queue, | |
612 | * just enqueue (no lbmWRITE to prevent redrive) | |
613 | * buffer to wqueue to ensure correct serial order | |
614 | * of the pages since log pages will be added | |
615 | * continuously | |
616 | */ | |
617 | if (bp->l_wqnext == NULL) | |
618 | lbmWrite(log, bp, 0, 0); | |
619 | } else { | |
620 | /* | |
621 | * No current GC leader, initiate group commit | |
622 | */ | |
623 | log->cflag |= logGC_PAGEOUT; | |
624 | lmGCwrite(log, 0); | |
625 | } | |
626 | } | |
627 | /* page is not bound with outstanding tblk: | |
628 | * init write or mark it to be redriven (lbmWRITE) | |
629 | */ | |
630 | else { | |
631 | /* finalize the page */ | |
632 | bp->l_ceor = bp->l_eor; | |
633 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
634 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); | |
635 | } | |
636 | LOGGC_UNLOCK(log); | |
637 | ||
638 | /* | |
f720e3ba | 639 | * allocate/initialize next page |
1da177e4 LT |
640 | */ |
641 | /* if log wraps, the first data page of log is 2 | |
642 | * (0 never used, 1 is superblock). | |
643 | */ | |
644 | log->page = (pn == log->size - 1) ? 2 : pn + 1; | |
645 | log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ | |
646 | ||
647 | /* allocate/initialize next log page buffer */ | |
648 | nextbp = lbmAllocate(log, log->page); | |
649 | nextbp->l_eor = log->eor; | |
650 | log->bp = nextbp; | |
651 | ||
652 | /* initialize next log page */ | |
653 | lp = (struct logpage *) nextbp->l_ldata; | |
654 | lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); | |
655 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | ||
661 | /* | |
662 | * NAME: lmGroupCommit() | |
663 | * | |
664 | * FUNCTION: group commit | |
665 | * initiate pageout of the pages with COMMIT in the order of | |
666 | * page number - redrive pageout of the page at the head of | |
667 | * pageout queue until full page has been written. | |
668 | * | |
63f83c9f | 669 | * RETURN: |
1da177e4 LT |
670 | * |
671 | * NOTE: | |
672 | * LOGGC_LOCK serializes log group commit queue, and | |
673 | * transaction blocks on the commit queue. | |
674 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
675 | */ | |
676 | int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) | |
677 | { | |
678 | int rc = 0; | |
679 | ||
680 | LOGGC_LOCK(log); | |
681 | ||
682 | /* group committed already ? */ | |
683 | if (tblk->flag & tblkGC_COMMITTED) { | |
684 | if (tblk->flag & tblkGC_ERROR) | |
685 | rc = -EIO; | |
686 | ||
687 | LOGGC_UNLOCK(log); | |
688 | return rc; | |
689 | } | |
690 | jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); | |
691 | ||
692 | if (tblk->xflag & COMMIT_LAZY) | |
693 | tblk->flag |= tblkGC_LAZY; | |
694 | ||
695 | if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && | |
696 | (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) | |
697 | || jfs_tlocks_low)) { | |
698 | /* | |
699 | * No pageout in progress | |
700 | * | |
701 | * start group commit as its group leader. | |
702 | */ | |
703 | log->cflag |= logGC_PAGEOUT; | |
704 | ||
705 | lmGCwrite(log, 0); | |
706 | } | |
707 | ||
708 | if (tblk->xflag & COMMIT_LAZY) { | |
709 | /* | |
710 | * Lazy transactions can leave now | |
711 | */ | |
712 | LOGGC_UNLOCK(log); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | /* lmGCwrite gives up LOGGC_LOCK, check again */ | |
717 | ||
718 | if (tblk->flag & tblkGC_COMMITTED) { | |
719 | if (tblk->flag & tblkGC_ERROR) | |
720 | rc = -EIO; | |
721 | ||
722 | LOGGC_UNLOCK(log); | |
723 | return rc; | |
724 | } | |
725 | ||
726 | /* upcount transaction waiting for completion | |
727 | */ | |
728 | log->gcrtc++; | |
729 | tblk->flag |= tblkGC_READY; | |
730 | ||
731 | __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), | |
732 | LOGGC_LOCK(log), LOGGC_UNLOCK(log)); | |
733 | ||
734 | /* removed from commit queue */ | |
735 | if (tblk->flag & tblkGC_ERROR) | |
736 | rc = -EIO; | |
737 | ||
738 | LOGGC_UNLOCK(log); | |
739 | return rc; | |
740 | } | |
741 | ||
742 | /* | |
743 | * NAME: lmGCwrite() | |
744 | * | |
745 | * FUNCTION: group commit write | |
746 | * initiate write of log page, building a group of all transactions | |
747 | * with commit records on that page. | |
748 | * | |
749 | * RETURN: None | |
750 | * | |
751 | * NOTE: | |
752 | * LOGGC_LOCK must be held by caller. | |
753 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
754 | */ | |
755 | static void lmGCwrite(struct jfs_log * log, int cant_write) | |
756 | { | |
757 | struct lbuf *bp; | |
758 | struct logpage *lp; | |
759 | int gcpn; /* group commit page number */ | |
760 | struct tblock *tblk; | |
761 | struct tblock *xtblk = NULL; | |
762 | ||
763 | /* | |
764 | * build the commit group of a log page | |
765 | * | |
766 | * scan commit queue and make a commit group of all | |
767 | * transactions with COMMIT records on the same log page. | |
768 | */ | |
769 | /* get the head tblk on the commit queue */ | |
770 | gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; | |
771 | ||
772 | list_for_each_entry(tblk, &log->cqueue, cqueue) { | |
773 | if (tblk->pn != gcpn) | |
774 | break; | |
775 | ||
776 | xtblk = tblk; | |
777 | ||
778 | /* state transition: (QUEUE, READY) -> COMMIT */ | |
779 | tblk->flag |= tblkGC_COMMIT; | |
780 | } | |
781 | tblk = xtblk; /* last tblk of the page */ | |
782 | ||
783 | /* | |
784 | * pageout to commit transactions on the log page. | |
785 | */ | |
786 | bp = (struct lbuf *) tblk->bp; | |
787 | lp = (struct logpage *) bp->l_ldata; | |
788 | /* is page already full ? */ | |
789 | if (tblk->flag & tblkGC_EOP) { | |
790 | /* mark page to free at end of group commit of the page */ | |
791 | tblk->flag &= ~tblkGC_EOP; | |
792 | tblk->flag |= tblkGC_FREE; | |
793 | bp->l_ceor = bp->l_eor; | |
794 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
795 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, | |
796 | cant_write); | |
797 | INCREMENT(lmStat.full_page); | |
798 | } | |
799 | /* page is not yet full */ | |
800 | else { | |
801 | bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ | |
802 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
803 | lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); | |
804 | INCREMENT(lmStat.partial_page); | |
805 | } | |
806 | } | |
807 | ||
808 | /* | |
809 | * NAME: lmPostGC() | |
810 | * | |
811 | * FUNCTION: group commit post-processing | |
812 | * Processes transactions after their commit records have been written | |
813 | * to disk, redriving log I/O if necessary. | |
814 | * | |
815 | * RETURN: None | |
816 | * | |
817 | * NOTE: | |
818 | * This routine is called a interrupt time by lbmIODone | |
819 | */ | |
820 | static void lmPostGC(struct lbuf * bp) | |
821 | { | |
822 | unsigned long flags; | |
823 | struct jfs_log *log = bp->l_log; | |
824 | struct logpage *lp; | |
825 | struct tblock *tblk, *temp; | |
826 | ||
827 | //LOGGC_LOCK(log); | |
828 | spin_lock_irqsave(&log->gclock, flags); | |
829 | /* | |
830 | * current pageout of group commit completed. | |
831 | * | |
832 | * remove/wakeup transactions from commit queue who were | |
833 | * group committed with the current log page | |
834 | */ | |
835 | list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { | |
836 | if (!(tblk->flag & tblkGC_COMMIT)) | |
837 | break; | |
838 | /* if transaction was marked GC_COMMIT then | |
839 | * it has been shipped in the current pageout | |
840 | * and made it to disk - it is committed. | |
841 | */ | |
842 | ||
843 | if (bp->l_flag & lbmERROR) | |
844 | tblk->flag |= tblkGC_ERROR; | |
845 | ||
846 | /* remove it from the commit queue */ | |
847 | list_del(&tblk->cqueue); | |
848 | tblk->flag &= ~tblkGC_QUEUE; | |
849 | ||
850 | if (tblk == log->flush_tblk) { | |
851 | /* we can stop flushing the log now */ | |
852 | clear_bit(log_FLUSH, &log->flag); | |
853 | log->flush_tblk = NULL; | |
854 | } | |
855 | ||
856 | jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, | |
857 | tblk->flag); | |
858 | ||
859 | if (!(tblk->xflag & COMMIT_FORCE)) | |
860 | /* | |
861 | * Hand tblk over to lazy commit thread | |
862 | */ | |
863 | txLazyUnlock(tblk); | |
864 | else { | |
865 | /* state transition: COMMIT -> COMMITTED */ | |
866 | tblk->flag |= tblkGC_COMMITTED; | |
867 | ||
868 | if (tblk->flag & tblkGC_READY) | |
869 | log->gcrtc--; | |
870 | ||
871 | LOGGC_WAKEUP(tblk); | |
872 | } | |
873 | ||
874 | /* was page full before pageout ? | |
875 | * (and this is the last tblk bound with the page) | |
876 | */ | |
877 | if (tblk->flag & tblkGC_FREE) | |
878 | lbmFree(bp); | |
879 | /* did page become full after pageout ? | |
880 | * (and this is the last tblk bound with the page) | |
881 | */ | |
882 | else if (tblk->flag & tblkGC_EOP) { | |
883 | /* finalize the page */ | |
884 | lp = (struct logpage *) bp->l_ldata; | |
885 | bp->l_ceor = bp->l_eor; | |
886 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
887 | jfs_info("lmPostGC: calling lbmWrite"); | |
888 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, | |
889 | 1); | |
890 | } | |
891 | ||
892 | } | |
893 | ||
894 | /* are there any transactions who have entered lnGroupCommit() | |
895 | * (whose COMMITs are after that of the last log page written. | |
896 | * They are waiting for new group commit (above at (SLEEP 1)) | |
897 | * or lazy transactions are on a full (queued) log page, | |
898 | * select the latest ready transaction as new group leader and | |
899 | * wake her up to lead her group. | |
900 | */ | |
901 | if ((!list_empty(&log->cqueue)) && | |
902 | ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || | |
903 | test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) | |
904 | /* | |
905 | * Call lmGCwrite with new group leader | |
906 | */ | |
907 | lmGCwrite(log, 1); | |
908 | ||
909 | /* no transaction are ready yet (transactions are only just | |
910 | * queued (GC_QUEUE) and not entered for group commit yet). | |
911 | * the first transaction entering group commit | |
912 | * will elect herself as new group leader. | |
913 | */ | |
914 | else | |
915 | log->cflag &= ~logGC_PAGEOUT; | |
916 | ||
917 | //LOGGC_UNLOCK(log); | |
918 | spin_unlock_irqrestore(&log->gclock, flags); | |
919 | return; | |
920 | } | |
921 | ||
922 | /* | |
923 | * NAME: lmLogSync() | |
924 | * | |
925 | * FUNCTION: write log SYNCPT record for specified log | |
926 | * if new sync address is available | |
927 | * (normally the case if sync() is executed by back-ground | |
928 | * process). | |
1da177e4 LT |
929 | * calculate new value of i_nextsync which determines when |
930 | * this code is called again. | |
931 | * | |
1c627829 | 932 | * PARAMETERS: log - log structure |
63f83c9f | 933 | * hard_sync - 1 to force all metadata to be written |
1da177e4 LT |
934 | * |
935 | * RETURN: 0 | |
63f83c9f | 936 | * |
1da177e4 LT |
937 | * serialization: LOG_LOCK() held on entry/exit |
938 | */ | |
cbc3d65e | 939 | static int lmLogSync(struct jfs_log * log, int hard_sync) |
1da177e4 LT |
940 | { |
941 | int logsize; | |
942 | int written; /* written since last syncpt */ | |
943 | int free; /* free space left available */ | |
944 | int delta; /* additional delta to write normally */ | |
945 | int more; /* additional write granted */ | |
946 | struct lrd lrd; | |
947 | int lsn; | |
948 | struct logsyncblk *lp; | |
7fab479b DK |
949 | unsigned long flags; |
950 | ||
951 | /* push dirty metapages out to disk */ | |
cbc3d65e | 952 | if (hard_sync) |
67e6682f | 953 | write_special_inodes(log, filemap_fdatawrite); |
cbc3d65e | 954 | else |
67e6682f | 955 | write_special_inodes(log, filemap_flush); |
1da177e4 LT |
956 | |
957 | /* | |
f720e3ba | 958 | * forward syncpt |
1da177e4 LT |
959 | */ |
960 | /* if last sync is same as last syncpt, | |
961 | * invoke sync point forward processing to update sync. | |
962 | */ | |
963 | ||
964 | if (log->sync == log->syncpt) { | |
7fab479b | 965 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
966 | if (list_empty(&log->synclist)) |
967 | log->sync = log->lsn; | |
968 | else { | |
969 | lp = list_entry(log->synclist.next, | |
970 | struct logsyncblk, synclist); | |
971 | log->sync = lp->lsn; | |
972 | } | |
7fab479b | 973 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
974 | |
975 | } | |
976 | ||
977 | /* if sync is different from last syncpt, | |
978 | * write a SYNCPT record with syncpt = sync. | |
979 | * reset syncpt = sync | |
980 | */ | |
981 | if (log->sync != log->syncpt) { | |
1da177e4 LT |
982 | lrd.logtid = 0; |
983 | lrd.backchain = 0; | |
984 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
985 | lrd.length = 0; | |
986 | lrd.log.syncpt.sync = cpu_to_le32(log->sync); | |
987 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
988 | ||
989 | log->syncpt = log->sync; | |
990 | } else | |
991 | lsn = log->lsn; | |
992 | ||
993 | /* | |
f720e3ba | 994 | * setup next syncpt trigger (SWAG) |
1da177e4 LT |
995 | */ |
996 | logsize = log->logsize; | |
997 | ||
998 | logdiff(written, lsn, log); | |
999 | free = logsize - written; | |
1000 | delta = LOGSYNC_DELTA(logsize); | |
1001 | more = min(free / 2, delta); | |
1002 | if (more < 2 * LOGPSIZE) { | |
1003 | jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); | |
1004 | /* | |
f720e3ba | 1005 | * log wrapping |
1da177e4 LT |
1006 | * |
1007 | * option 1 - panic ? No.! | |
1008 | * option 2 - shutdown file systems | |
f720e3ba | 1009 | * associated with log ? |
1da177e4 LT |
1010 | * option 3 - extend log ? |
1011 | */ | |
1012 | /* | |
1013 | * option 4 - second chance | |
1014 | * | |
1015 | * mark log wrapped, and continue. | |
1016 | * when all active transactions are completed, | |
1017 | * mark log vaild for recovery. | |
1018 | * if crashed during invalid state, log state | |
1019 | * implies invald log, forcing fsck(). | |
1020 | */ | |
1021 | /* mark log state log wrap in log superblock */ | |
1022 | /* log->state = LOGWRAP; */ | |
1023 | ||
1024 | /* reset sync point computation */ | |
1025 | log->syncpt = log->sync = lsn; | |
1026 | log->nextsync = delta; | |
1027 | } else | |
1028 | /* next syncpt trigger = written + more */ | |
1029 | log->nextsync = written + more; | |
1030 | ||
1da177e4 LT |
1031 | /* if number of bytes written from last sync point is more |
1032 | * than 1/4 of the log size, stop new transactions from | |
1033 | * starting until all current transactions are completed | |
1034 | * by setting syncbarrier flag. | |
1035 | */ | |
c2783f3a DK |
1036 | if (!test_bit(log_SYNCBARRIER, &log->flag) && |
1037 | (written > LOGSYNC_BARRIER(logsize)) && log->active) { | |
1da177e4 LT |
1038 | set_bit(log_SYNCBARRIER, &log->flag); |
1039 | jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, | |
1040 | log->syncpt); | |
1041 | /* | |
1042 | * We may have to initiate group commit | |
1043 | */ | |
1044 | jfs_flush_journal(log, 0); | |
1045 | } | |
1046 | ||
1047 | return lsn; | |
1048 | } | |
1049 | ||
1c627829 DK |
1050 | /* |
1051 | * NAME: jfs_syncpt | |
1052 | * | |
1053 | * FUNCTION: write log SYNCPT record for specified log | |
1054 | * | |
cbc3d65e | 1055 | * PARAMETERS: log - log structure |
63f83c9f | 1056 | * hard_sync - set to 1 to force metadata to be written |
1c627829 | 1057 | */ |
cbc3d65e | 1058 | void jfs_syncpt(struct jfs_log *log, int hard_sync) |
1c627829 | 1059 | { LOG_LOCK(log); |
cbc3d65e | 1060 | lmLogSync(log, hard_sync); |
1c627829 DK |
1061 | LOG_UNLOCK(log); |
1062 | } | |
1da177e4 LT |
1063 | |
1064 | /* | |
1065 | * NAME: lmLogOpen() | |
1066 | * | |
f720e3ba | 1067 | * FUNCTION: open the log on first open; |
1da177e4 LT |
1068 | * insert filesystem in the active list of the log. |
1069 | * | |
1070 | * PARAMETER: ipmnt - file system mount inode | |
63f83c9f | 1071 | * iplog - log inode (out) |
1da177e4 LT |
1072 | * |
1073 | * RETURN: | |
1074 | * | |
1075 | * serialization: | |
1076 | */ | |
1077 | int lmLogOpen(struct super_block *sb) | |
1078 | { | |
1079 | int rc; | |
1080 | struct block_device *bdev; | |
1081 | struct jfs_log *log; | |
1082 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1083 | ||
1084 | if (sbi->flag & JFS_NOINTEGRITY) | |
1085 | return open_dummy_log(sb); | |
63f83c9f | 1086 | |
1da177e4 LT |
1087 | if (sbi->mntflag & JFS_INLINELOG) |
1088 | return open_inline_log(sb); | |
1089 | ||
353ab6e9 | 1090 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1091 | list_for_each_entry(log, &jfs_external_logs, journal_list) { |
1092 | if (log->bdev->bd_dev == sbi->logdev) { | |
1093 | if (memcmp(log->uuid, sbi->loguuid, | |
1094 | sizeof(log->uuid))) { | |
1095 | jfs_warn("wrong uuid on JFS journal\n"); | |
353ab6e9 | 1096 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1097 | return -EINVAL; |
1098 | } | |
1099 | /* | |
1100 | * add file system to log active file system list | |
1101 | */ | |
1102 | if ((rc = lmLogFileSystem(log, sbi, 1))) { | |
353ab6e9 | 1103 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1104 | return rc; |
1105 | } | |
1106 | goto journal_found; | |
1107 | } | |
1108 | } | |
1109 | ||
5b3030e3 | 1110 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
353ab6e9 | 1111 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1112 | return -ENOMEM; |
1113 | } | |
1da177e4 LT |
1114 | INIT_LIST_HEAD(&log->sb_list); |
1115 | init_waitqueue_head(&log->syncwait); | |
1116 | ||
1117 | /* | |
f720e3ba | 1118 | * external log as separate logical volume |
1da177e4 LT |
1119 | * |
1120 | * file systems to log may have n-to-1 relationship; | |
1121 | */ | |
1122 | ||
1123 | bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE); | |
1124 | if (IS_ERR(bdev)) { | |
1125 | rc = -PTR_ERR(bdev); | |
1126 | goto free; | |
1127 | } | |
1128 | ||
1129 | if ((rc = bd_claim(bdev, log))) { | |
1130 | goto close; | |
1131 | } | |
1132 | ||
1133 | log->bdev = bdev; | |
1134 | memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); | |
63f83c9f | 1135 | |
1da177e4 LT |
1136 | /* |
1137 | * initialize log: | |
1138 | */ | |
1139 | if ((rc = lmLogInit(log))) | |
1140 | goto unclaim; | |
1141 | ||
1142 | list_add(&log->journal_list, &jfs_external_logs); | |
1143 | ||
1144 | /* | |
1145 | * add file system to log active file system list | |
1146 | */ | |
1147 | if ((rc = lmLogFileSystem(log, sbi, 1))) | |
1148 | goto shutdown; | |
1149 | ||
1150 | journal_found: | |
1151 | LOG_LOCK(log); | |
1152 | list_add(&sbi->log_list, &log->sb_list); | |
1153 | sbi->log = log; | |
1154 | LOG_UNLOCK(log); | |
1155 | ||
353ab6e9 | 1156 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1157 | return 0; |
1158 | ||
1159 | /* | |
f720e3ba | 1160 | * unwind on error |
1da177e4 LT |
1161 | */ |
1162 | shutdown: /* unwind lbmLogInit() */ | |
1163 | list_del(&log->journal_list); | |
1164 | lbmLogShutdown(log); | |
1165 | ||
1166 | unclaim: | |
1167 | bd_release(bdev); | |
1168 | ||
1169 | close: /* close external log device */ | |
1170 | blkdev_put(bdev); | |
1171 | ||
1172 | free: /* free log descriptor */ | |
353ab6e9 | 1173 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1174 | kfree(log); |
1175 | ||
1176 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1177 | return rc; | |
1178 | } | |
1179 | ||
1180 | static int open_inline_log(struct super_block *sb) | |
1181 | { | |
1182 | struct jfs_log *log; | |
1183 | int rc; | |
1184 | ||
5b3030e3 | 1185 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
1da177e4 | 1186 | return -ENOMEM; |
1da177e4 LT |
1187 | INIT_LIST_HEAD(&log->sb_list); |
1188 | init_waitqueue_head(&log->syncwait); | |
1189 | ||
1190 | set_bit(log_INLINELOG, &log->flag); | |
1191 | log->bdev = sb->s_bdev; | |
1192 | log->base = addressPXD(&JFS_SBI(sb)->logpxd); | |
1193 | log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> | |
1194 | (L2LOGPSIZE - sb->s_blocksize_bits); | |
1195 | log->l2bsize = sb->s_blocksize_bits; | |
1196 | ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); | |
1197 | ||
1198 | /* | |
1199 | * initialize log. | |
1200 | */ | |
1201 | if ((rc = lmLogInit(log))) { | |
1202 | kfree(log); | |
1203 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1204 | return rc; | |
1205 | } | |
1206 | ||
1207 | list_add(&JFS_SBI(sb)->log_list, &log->sb_list); | |
1208 | JFS_SBI(sb)->log = log; | |
1209 | ||
1210 | return rc; | |
1211 | } | |
1212 | ||
1213 | static int open_dummy_log(struct super_block *sb) | |
1214 | { | |
1215 | int rc; | |
1216 | ||
353ab6e9 | 1217 | mutex_lock(&jfs_log_mutex); |
1da177e4 | 1218 | if (!dummy_log) { |
5b3030e3 | 1219 | dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
1da177e4 | 1220 | if (!dummy_log) { |
353ab6e9 | 1221 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1222 | return -ENOMEM; |
1223 | } | |
1da177e4 LT |
1224 | INIT_LIST_HEAD(&dummy_log->sb_list); |
1225 | init_waitqueue_head(&dummy_log->syncwait); | |
1226 | dummy_log->no_integrity = 1; | |
1227 | /* Make up some stuff */ | |
1228 | dummy_log->base = 0; | |
1229 | dummy_log->size = 1024; | |
1230 | rc = lmLogInit(dummy_log); | |
1231 | if (rc) { | |
1232 | kfree(dummy_log); | |
1233 | dummy_log = NULL; | |
353ab6e9 | 1234 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1235 | return rc; |
1236 | } | |
1237 | } | |
1238 | ||
1239 | LOG_LOCK(dummy_log); | |
1240 | list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); | |
1241 | JFS_SBI(sb)->log = dummy_log; | |
1242 | LOG_UNLOCK(dummy_log); | |
353ab6e9 | 1243 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1244 | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * NAME: lmLogInit() | |
1250 | * | |
1251 | * FUNCTION: log initialization at first log open. | |
1252 | * | |
1253 | * logredo() (or logformat()) should have been run previously. | |
1254 | * initialize the log from log superblock. | |
1255 | * set the log state in the superblock to LOGMOUNT and | |
1256 | * write SYNCPT log record. | |
63f83c9f | 1257 | * |
1da177e4 LT |
1258 | * PARAMETER: log - log structure |
1259 | * | |
1260 | * RETURN: 0 - if ok | |
1261 | * -EINVAL - bad log magic number or superblock dirty | |
1262 | * error returned from logwait() | |
63f83c9f | 1263 | * |
1da177e4 LT |
1264 | * serialization: single first open thread |
1265 | */ | |
1266 | int lmLogInit(struct jfs_log * log) | |
1267 | { | |
1268 | int rc = 0; | |
1269 | struct lrd lrd; | |
1270 | struct logsuper *logsuper; | |
1271 | struct lbuf *bpsuper; | |
1272 | struct lbuf *bp; | |
1273 | struct logpage *lp; | |
1274 | int lsn = 0; | |
1275 | ||
1276 | jfs_info("lmLogInit: log:0x%p", log); | |
1277 | ||
1278 | /* initialize the group commit serialization lock */ | |
1279 | LOGGC_LOCK_INIT(log); | |
1280 | ||
1281 | /* allocate/initialize the log write serialization lock */ | |
1282 | LOG_LOCK_INIT(log); | |
1283 | ||
1284 | LOGSYNC_LOCK_INIT(log); | |
1285 | ||
1286 | INIT_LIST_HEAD(&log->synclist); | |
1287 | ||
1288 | INIT_LIST_HEAD(&log->cqueue); | |
1289 | log->flush_tblk = NULL; | |
1290 | ||
1291 | log->count = 0; | |
1292 | ||
1293 | /* | |
1294 | * initialize log i/o | |
1295 | */ | |
1296 | if ((rc = lbmLogInit(log))) | |
1297 | return rc; | |
1298 | ||
1299 | if (!test_bit(log_INLINELOG, &log->flag)) | |
1300 | log->l2bsize = L2LOGPSIZE; | |
63f83c9f | 1301 | |
1da177e4 LT |
1302 | /* check for disabled journaling to disk */ |
1303 | if (log->no_integrity) { | |
1304 | /* | |
1305 | * Journal pages will still be filled. When the time comes | |
1306 | * to actually do the I/O, the write is not done, and the | |
1307 | * endio routine is called directly. | |
1308 | */ | |
1309 | bp = lbmAllocate(log , 0); | |
1310 | log->bp = bp; | |
1311 | bp->l_pn = bp->l_eor = 0; | |
1312 | } else { | |
1313 | /* | |
1314 | * validate log superblock | |
1315 | */ | |
1316 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1317 | goto errout10; | |
1318 | ||
1319 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1320 | ||
1321 | if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { | |
1322 | jfs_warn("*** Log Format Error ! ***"); | |
1323 | rc = -EINVAL; | |
1324 | goto errout20; | |
1325 | } | |
1326 | ||
1327 | /* logredo() should have been run successfully. */ | |
1328 | if (logsuper->state != cpu_to_le32(LOGREDONE)) { | |
1329 | jfs_warn("*** Log Is Dirty ! ***"); | |
1330 | rc = -EINVAL; | |
1331 | goto errout20; | |
1332 | } | |
1333 | ||
1334 | /* initialize log from log superblock */ | |
1335 | if (test_bit(log_INLINELOG,&log->flag)) { | |
1336 | if (log->size != le32_to_cpu(logsuper->size)) { | |
1337 | rc = -EINVAL; | |
1338 | goto errout20; | |
1339 | } | |
1340 | jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " | |
1341 | "size:0x%x", log, | |
1342 | (unsigned long long) log->base, log->size); | |
1343 | } else { | |
1344 | if (memcmp(logsuper->uuid, log->uuid, 16)) { | |
1345 | jfs_warn("wrong uuid on JFS log device"); | |
1346 | goto errout20; | |
1347 | } | |
1348 | log->size = le32_to_cpu(logsuper->size); | |
1349 | log->l2bsize = le32_to_cpu(logsuper->l2bsize); | |
1350 | jfs_info("lmLogInit: external log:0x%p base:0x%Lx " | |
1351 | "size:0x%x", log, | |
1352 | (unsigned long long) log->base, log->size); | |
1353 | } | |
1354 | ||
1355 | log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; | |
1356 | log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); | |
1357 | ||
1358 | /* | |
1359 | * initialize for log append write mode | |
1360 | */ | |
1361 | /* establish current/end-of-log page/buffer */ | |
1362 | if ((rc = lbmRead(log, log->page, &bp))) | |
1363 | goto errout20; | |
1364 | ||
1365 | lp = (struct logpage *) bp->l_ldata; | |
1366 | ||
1367 | jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", | |
1368 | le32_to_cpu(logsuper->end), log->page, log->eor, | |
1369 | le16_to_cpu(lp->h.eor)); | |
1370 | ||
1371 | log->bp = bp; | |
1372 | bp->l_pn = log->page; | |
1373 | bp->l_eor = log->eor; | |
1374 | ||
1375 | /* if current page is full, move on to next page */ | |
1376 | if (log->eor >= LOGPSIZE - LOGPTLRSIZE) | |
1377 | lmNextPage(log); | |
1378 | ||
1379 | /* | |
1380 | * initialize log syncpoint | |
1381 | */ | |
1382 | /* | |
1383 | * write the first SYNCPT record with syncpoint = 0 | |
1384 | * (i.e., log redo up to HERE !); | |
1385 | * remove current page from lbm write queue at end of pageout | |
1386 | * (to write log superblock update), but do not release to | |
1387 | * freelist; | |
1388 | */ | |
1389 | lrd.logtid = 0; | |
1390 | lrd.backchain = 0; | |
1391 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1392 | lrd.length = 0; | |
1393 | lrd.log.syncpt.sync = 0; | |
1394 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1395 | bp = log->bp; | |
1396 | bp->l_ceor = bp->l_eor; | |
1397 | lp = (struct logpage *) bp->l_ldata; | |
1398 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1399 | lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); | |
1400 | if ((rc = lbmIOWait(bp, 0))) | |
1401 | goto errout30; | |
1402 | ||
1403 | /* | |
1404 | * update/write superblock | |
1405 | */ | |
1406 | logsuper->state = cpu_to_le32(LOGMOUNT); | |
1407 | log->serial = le32_to_cpu(logsuper->serial) + 1; | |
1408 | logsuper->serial = cpu_to_le32(log->serial); | |
1409 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1410 | if ((rc = lbmIOWait(bpsuper, lbmFREE))) | |
1411 | goto errout30; | |
1412 | } | |
1413 | ||
1414 | /* initialize logsync parameters */ | |
1415 | log->logsize = (log->size - 2) << L2LOGPSIZE; | |
1416 | log->lsn = lsn; | |
1417 | log->syncpt = lsn; | |
1418 | log->sync = log->syncpt; | |
1419 | log->nextsync = LOGSYNC_DELTA(log->logsize); | |
1420 | ||
1421 | jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", | |
1422 | log->lsn, log->syncpt, log->sync); | |
1423 | ||
1424 | /* | |
1425 | * initialize for lazy/group commit | |
1426 | */ | |
1427 | log->clsn = lsn; | |
1428 | ||
1429 | return 0; | |
1430 | ||
1431 | /* | |
f720e3ba | 1432 | * unwind on error |
1da177e4 LT |
1433 | */ |
1434 | errout30: /* release log page */ | |
1435 | log->wqueue = NULL; | |
1436 | bp->l_wqnext = NULL; | |
1437 | lbmFree(bp); | |
1438 | ||
1439 | errout20: /* release log superblock */ | |
1440 | lbmFree(bpsuper); | |
1441 | ||
1442 | errout10: /* unwind lbmLogInit() */ | |
1443 | lbmLogShutdown(log); | |
1444 | ||
1445 | jfs_warn("lmLogInit: exit(%d)", rc); | |
1446 | return rc; | |
1447 | } | |
1448 | ||
1449 | ||
1450 | /* | |
1451 | * NAME: lmLogClose() | |
1452 | * | |
1453 | * FUNCTION: remove file system <ipmnt> from active list of log <iplog> | |
1454 | * and close it on last close. | |
1455 | * | |
1456 | * PARAMETER: sb - superblock | |
1457 | * | |
1458 | * RETURN: errors from subroutines | |
1459 | * | |
1460 | * serialization: | |
1461 | */ | |
1462 | int lmLogClose(struct super_block *sb) | |
1463 | { | |
1464 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1465 | struct jfs_log *log = sbi->log; | |
1466 | struct block_device *bdev; | |
1467 | int rc = 0; | |
1468 | ||
1469 | jfs_info("lmLogClose: log:0x%p", log); | |
1470 | ||
353ab6e9 | 1471 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1472 | LOG_LOCK(log); |
1473 | list_del(&sbi->log_list); | |
1474 | LOG_UNLOCK(log); | |
1475 | sbi->log = NULL; | |
1476 | ||
1477 | /* | |
1478 | * We need to make sure all of the "written" metapages | |
1479 | * actually make it to disk | |
1480 | */ | |
1481 | sync_blockdev(sb->s_bdev); | |
1482 | ||
1483 | if (test_bit(log_INLINELOG, &log->flag)) { | |
1484 | /* | |
f720e3ba | 1485 | * in-line log in host file system |
1da177e4 LT |
1486 | */ |
1487 | rc = lmLogShutdown(log); | |
1488 | kfree(log); | |
1489 | goto out; | |
1490 | } | |
1491 | ||
1492 | if (!log->no_integrity) | |
1493 | lmLogFileSystem(log, sbi, 0); | |
1494 | ||
1495 | if (!list_empty(&log->sb_list)) | |
1496 | goto out; | |
1497 | ||
1498 | /* | |
1499 | * TODO: ensure that the dummy_log is in a state to allow | |
1500 | * lbmLogShutdown to deallocate all the buffers and call | |
1501 | * kfree against dummy_log. For now, leave dummy_log & its | |
1502 | * buffers in memory, and resuse if another no-integrity mount | |
1503 | * is requested. | |
1504 | */ | |
1505 | if (log->no_integrity) | |
1506 | goto out; | |
1507 | ||
1508 | /* | |
f720e3ba | 1509 | * external log as separate logical volume |
1da177e4 LT |
1510 | */ |
1511 | list_del(&log->journal_list); | |
1512 | bdev = log->bdev; | |
1513 | rc = lmLogShutdown(log); | |
1514 | ||
1515 | bd_release(bdev); | |
1516 | blkdev_put(bdev); | |
1517 | ||
1518 | kfree(log); | |
1519 | ||
1520 | out: | |
353ab6e9 | 1521 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1522 | jfs_info("lmLogClose: exit(%d)", rc); |
1523 | return rc; | |
1524 | } | |
1525 | ||
1526 | ||
1527 | /* | |
1528 | * NAME: jfs_flush_journal() | |
1529 | * | |
1530 | * FUNCTION: initiate write of any outstanding transactions to the journal | |
1531 | * and optionally wait until they are all written to disk | |
1532 | * | |
1533 | * wait == 0 flush until latest txn is committed, don't wait | |
1534 | * wait == 1 flush until latest txn is committed, wait | |
1535 | * wait > 1 flush until all txn's are complete, wait | |
1536 | */ | |
1537 | void jfs_flush_journal(struct jfs_log *log, int wait) | |
1538 | { | |
1539 | int i; | |
1540 | struct tblock *target = NULL; | |
1541 | ||
1542 | /* jfs_write_inode may call us during read-only mount */ | |
1543 | if (!log) | |
1544 | return; | |
1545 | ||
1546 | jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); | |
1547 | ||
1548 | LOGGC_LOCK(log); | |
1549 | ||
1550 | if (!list_empty(&log->cqueue)) { | |
1551 | /* | |
1552 | * This ensures that we will keep writing to the journal as long | |
1553 | * as there are unwritten commit records | |
1554 | */ | |
1555 | target = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
1556 | ||
1557 | if (test_bit(log_FLUSH, &log->flag)) { | |
1558 | /* | |
1559 | * We're already flushing. | |
1560 | * if flush_tblk is NULL, we are flushing everything, | |
1561 | * so leave it that way. Otherwise, update it to the | |
1562 | * latest transaction | |
1563 | */ | |
1564 | if (log->flush_tblk) | |
1565 | log->flush_tblk = target; | |
1566 | } else { | |
1567 | /* Only flush until latest transaction is committed */ | |
1568 | log->flush_tblk = target; | |
1569 | set_bit(log_FLUSH, &log->flag); | |
1570 | ||
1571 | /* | |
1572 | * Initiate I/O on outstanding transactions | |
1573 | */ | |
1574 | if (!(log->cflag & logGC_PAGEOUT)) { | |
1575 | log->cflag |= logGC_PAGEOUT; | |
1576 | lmGCwrite(log, 0); | |
1577 | } | |
1578 | } | |
1579 | } | |
1580 | if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { | |
1581 | /* Flush until all activity complete */ | |
1582 | set_bit(log_FLUSH, &log->flag); | |
1583 | log->flush_tblk = NULL; | |
1584 | } | |
1585 | ||
1586 | if (wait && target && !(target->flag & tblkGC_COMMITTED)) { | |
1587 | DECLARE_WAITQUEUE(__wait, current); | |
1588 | ||
1589 | add_wait_queue(&target->gcwait, &__wait); | |
1590 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1591 | LOGGC_UNLOCK(log); | |
1592 | schedule(); | |
3cbb1c8e | 1593 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1594 | LOGGC_LOCK(log); |
1595 | remove_wait_queue(&target->gcwait, &__wait); | |
1596 | } | |
1597 | LOGGC_UNLOCK(log); | |
1598 | ||
1599 | if (wait < 2) | |
1600 | return; | |
1601 | ||
67e6682f | 1602 | write_special_inodes(log, filemap_fdatawrite); |
7fab479b | 1603 | |
1da177e4 LT |
1604 | /* |
1605 | * If there was recent activity, we may need to wait | |
1606 | * for the lazycommit thread to catch up | |
1607 | */ | |
1608 | if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { | |
7fab479b | 1609 | for (i = 0; i < 200; i++) { /* Too much? */ |
1da177e4 | 1610 | msleep(250); |
67e6682f | 1611 | write_special_inodes(log, filemap_fdatawrite); |
1da177e4 LT |
1612 | if (list_empty(&log->cqueue) && |
1613 | list_empty(&log->synclist)) | |
1614 | break; | |
1615 | } | |
1616 | } | |
1617 | assert(list_empty(&log->cqueue)); | |
72e3148a DK |
1618 | |
1619 | #ifdef CONFIG_JFS_DEBUG | |
7fab479b DK |
1620 | if (!list_empty(&log->synclist)) { |
1621 | struct logsyncblk *lp; | |
1622 | ||
209e101b | 1623 | printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
7fab479b DK |
1624 | list_for_each_entry(lp, &log->synclist, synclist) { |
1625 | if (lp->xflag & COMMIT_PAGE) { | |
1626 | struct metapage *mp = (struct metapage *)lp; | |
288e4d83 DK |
1627 | print_hex_dump(KERN_ERR, "metapage: ", |
1628 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1629 | mp, sizeof(struct metapage), 0); | |
1630 | print_hex_dump(KERN_ERR, "page: ", | |
1631 | DUMP_PREFIX_ADDRESS, 16, | |
1632 | sizeof(long), mp->page, | |
1633 | sizeof(struct page), 0); | |
1634 | } else | |
1635 | print_hex_dump(KERN_ERR, "tblock:", | |
1636 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1637 | lp, sizeof(struct tblock), 0); | |
7fab479b | 1638 | } |
7fab479b | 1639 | } |
288e4d83 DK |
1640 | #else |
1641 | WARN_ON(!list_empty(&log->synclist)); | |
72e3148a | 1642 | #endif |
1da177e4 LT |
1643 | clear_bit(log_FLUSH, &log->flag); |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * NAME: lmLogShutdown() | |
1648 | * | |
1649 | * FUNCTION: log shutdown at last LogClose(). | |
1650 | * | |
1651 | * write log syncpt record. | |
1652 | * update super block to set redone flag to 0. | |
1653 | * | |
1654 | * PARAMETER: log - log inode | |
1655 | * | |
1656 | * RETURN: 0 - success | |
63f83c9f | 1657 | * |
1da177e4 LT |
1658 | * serialization: single last close thread |
1659 | */ | |
1660 | int lmLogShutdown(struct jfs_log * log) | |
1661 | { | |
1662 | int rc; | |
1663 | struct lrd lrd; | |
1664 | int lsn; | |
1665 | struct logsuper *logsuper; | |
1666 | struct lbuf *bpsuper; | |
1667 | struct lbuf *bp; | |
1668 | struct logpage *lp; | |
1669 | ||
1670 | jfs_info("lmLogShutdown: log:0x%p", log); | |
1671 | ||
1672 | jfs_flush_journal(log, 2); | |
1673 | ||
1674 | /* | |
1675 | * write the last SYNCPT record with syncpoint = 0 | |
1676 | * (i.e., log redo up to HERE !) | |
1677 | */ | |
1678 | lrd.logtid = 0; | |
1679 | lrd.backchain = 0; | |
1680 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1681 | lrd.length = 0; | |
1682 | lrd.log.syncpt.sync = 0; | |
63f83c9f | 1683 | |
1da177e4 LT |
1684 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
1685 | bp = log->bp; | |
1686 | lp = (struct logpage *) bp->l_ldata; | |
1687 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1688 | lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); | |
1689 | lbmIOWait(log->bp, lbmFREE); | |
dc5798d9 | 1690 | log->bp = NULL; |
1da177e4 LT |
1691 | |
1692 | /* | |
1693 | * synchronous update log superblock | |
1694 | * mark log state as shutdown cleanly | |
1695 | * (i.e., Log does not need to be replayed). | |
1696 | */ | |
1697 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1698 | goto out; | |
1699 | ||
1700 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1701 | logsuper->state = cpu_to_le32(LOGREDONE); | |
1702 | logsuper->end = cpu_to_le32(lsn); | |
1703 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1704 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1705 | ||
1706 | jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", | |
1707 | lsn, log->page, log->eor); | |
1708 | ||
63f83c9f | 1709 | out: |
1da177e4 LT |
1710 | /* |
1711 | * shutdown per log i/o | |
1712 | */ | |
1713 | lbmLogShutdown(log); | |
1714 | ||
1715 | if (rc) { | |
1716 | jfs_warn("lmLogShutdown: exit(%d)", rc); | |
1717 | } | |
1718 | return rc; | |
1719 | } | |
1720 | ||
1721 | ||
1722 | /* | |
1723 | * NAME: lmLogFileSystem() | |
1724 | * | |
1725 | * FUNCTION: insert (<activate> = true)/remove (<activate> = false) | |
1726 | * file system into/from log active file system list. | |
1727 | * | |
1728 | * PARAMETE: log - pointer to logs inode. | |
1729 | * fsdev - kdev_t of filesystem. | |
f720e3ba | 1730 | * serial - pointer to returned log serial number |
1da177e4 LT |
1731 | * activate - insert/remove device from active list. |
1732 | * | |
1733 | * RETURN: 0 - success | |
1734 | * errors returned by vms_iowait(). | |
1735 | */ | |
1736 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
1737 | int activate) | |
1738 | { | |
1739 | int rc = 0; | |
1740 | int i; | |
1741 | struct logsuper *logsuper; | |
1742 | struct lbuf *bpsuper; | |
1743 | char *uuid = sbi->uuid; | |
1744 | ||
1745 | /* | |
1746 | * insert/remove file system device to log active file system list. | |
1747 | */ | |
1748 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1749 | return rc; | |
1750 | ||
1751 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1752 | if (activate) { | |
1753 | for (i = 0; i < MAX_ACTIVE; i++) | |
1754 | if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { | |
1755 | memcpy(logsuper->active[i].uuid, uuid, 16); | |
1756 | sbi->aggregate = i; | |
1757 | break; | |
1758 | } | |
1759 | if (i == MAX_ACTIVE) { | |
1760 | jfs_warn("Too many file systems sharing journal!"); | |
1761 | lbmFree(bpsuper); | |
1762 | return -EMFILE; /* Is there a better rc? */ | |
1763 | } | |
1764 | } else { | |
1765 | for (i = 0; i < MAX_ACTIVE; i++) | |
1766 | if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { | |
1767 | memcpy(logsuper->active[i].uuid, NULL_UUID, 16); | |
1768 | break; | |
1769 | } | |
1770 | if (i == MAX_ACTIVE) { | |
1771 | jfs_warn("Somebody stomped on the journal!"); | |
1772 | lbmFree(bpsuper); | |
1773 | return -EIO; | |
1774 | } | |
63f83c9f | 1775 | |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | /* | |
1779 | * synchronous write log superblock: | |
1780 | * | |
1781 | * write sidestream bypassing write queue: | |
1782 | * at file system mount, log super block is updated for | |
1783 | * activation of the file system before any log record | |
1784 | * (MOUNT record) of the file system, and at file system | |
1785 | * unmount, all meta data for the file system has been | |
1786 | * flushed before log super block is updated for deactivation | |
1787 | * of the file system. | |
1788 | */ | |
1789 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1790 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1791 | ||
1792 | return rc; | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * log buffer manager (lbm) | |
1797 | * ------------------------ | |
1798 | * | |
1799 | * special purpose buffer manager supporting log i/o requirements. | |
1800 | * | |
1801 | * per log write queue: | |
1802 | * log pageout occurs in serial order by fifo write queue and | |
1803 | * restricting to a single i/o in pregress at any one time. | |
1804 | * a circular singly-linked list | |
1805 | * (log->wrqueue points to the tail, and buffers are linked via | |
1806 | * bp->wrqueue field), and | |
1807 | * maintains log page in pageout ot waiting for pageout in serial pageout. | |
1808 | */ | |
1809 | ||
1810 | /* | |
1811 | * lbmLogInit() | |
1812 | * | |
1813 | * initialize per log I/O setup at lmLogInit() | |
1814 | */ | |
1815 | static int lbmLogInit(struct jfs_log * log) | |
1816 | { /* log inode */ | |
1817 | int i; | |
1818 | struct lbuf *lbuf; | |
1819 | ||
1820 | jfs_info("lbmLogInit: log:0x%p", log); | |
1821 | ||
1822 | /* initialize current buffer cursor */ | |
1823 | log->bp = NULL; | |
1824 | ||
1825 | /* initialize log device write queue */ | |
1826 | log->wqueue = NULL; | |
1827 | ||
1828 | /* | |
1829 | * Each log has its own buffer pages allocated to it. These are | |
1830 | * not managed by the page cache. This ensures that a transaction | |
1831 | * writing to the log does not block trying to allocate a page from | |
1832 | * the page cache (for the log). This would be bad, since page | |
1833 | * allocation waits on the kswapd thread that may be committing inodes | |
1834 | * which would cause log activity. Was that clear? I'm trying to | |
1835 | * avoid deadlock here. | |
1836 | */ | |
1837 | init_waitqueue_head(&log->free_wait); | |
1838 | ||
1839 | log->lbuf_free = NULL; | |
1840 | ||
dc5798d9 DK |
1841 | for (i = 0; i < LOGPAGES;) { |
1842 | char *buffer; | |
1843 | uint offset; | |
1844 | struct page *page; | |
1845 | ||
1846 | buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
1847 | if (buffer == NULL) | |
1da177e4 | 1848 | goto error; |
dc5798d9 DK |
1849 | page = virt_to_page(buffer); |
1850 | for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { | |
1851 | lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); | |
1852 | if (lbuf == NULL) { | |
1853 | if (offset == 0) | |
1854 | free_page((unsigned long) buffer); | |
1855 | goto error; | |
1856 | } | |
1857 | if (offset) /* we already have one reference */ | |
1858 | get_page(page); | |
1859 | lbuf->l_offset = offset; | |
1860 | lbuf->l_ldata = buffer + offset; | |
1861 | lbuf->l_page = page; | |
1862 | lbuf->l_log = log; | |
1863 | init_waitqueue_head(&lbuf->l_ioevent); | |
1864 | ||
1865 | lbuf->l_freelist = log->lbuf_free; | |
1866 | log->lbuf_free = lbuf; | |
1867 | i++; | |
1da177e4 | 1868 | } |
1da177e4 LT |
1869 | } |
1870 | ||
1871 | return (0); | |
1872 | ||
1873 | error: | |
1874 | lbmLogShutdown(log); | |
1875 | return -ENOMEM; | |
1876 | } | |
1877 | ||
1878 | ||
1879 | /* | |
1880 | * lbmLogShutdown() | |
1881 | * | |
1882 | * finalize per log I/O setup at lmLogShutdown() | |
1883 | */ | |
1884 | static void lbmLogShutdown(struct jfs_log * log) | |
1885 | { | |
1886 | struct lbuf *lbuf; | |
1887 | ||
1888 | jfs_info("lbmLogShutdown: log:0x%p", log); | |
1889 | ||
1890 | lbuf = log->lbuf_free; | |
1891 | while (lbuf) { | |
1892 | struct lbuf *next = lbuf->l_freelist; | |
dc5798d9 | 1893 | __free_page(lbuf->l_page); |
1da177e4 LT |
1894 | kfree(lbuf); |
1895 | lbuf = next; | |
1896 | } | |
1da177e4 LT |
1897 | } |
1898 | ||
1899 | ||
1900 | /* | |
1901 | * lbmAllocate() | |
1902 | * | |
1903 | * allocate an empty log buffer | |
1904 | */ | |
1905 | static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) | |
1906 | { | |
1907 | struct lbuf *bp; | |
1908 | unsigned long flags; | |
1909 | ||
1910 | /* | |
1911 | * recycle from log buffer freelist if any | |
1912 | */ | |
1913 | LCACHE_LOCK(flags); | |
1914 | LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); | |
1915 | log->lbuf_free = bp->l_freelist; | |
1916 | LCACHE_UNLOCK(flags); | |
1917 | ||
1918 | bp->l_flag = 0; | |
1919 | ||
1920 | bp->l_wqnext = NULL; | |
1921 | bp->l_freelist = NULL; | |
1922 | ||
1923 | bp->l_pn = pn; | |
1924 | bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); | |
1925 | bp->l_ceor = 0; | |
1926 | ||
1927 | return bp; | |
1928 | } | |
1929 | ||
1930 | ||
1931 | /* | |
1932 | * lbmFree() | |
1933 | * | |
1934 | * release a log buffer to freelist | |
1935 | */ | |
1936 | static void lbmFree(struct lbuf * bp) | |
1937 | { | |
1938 | unsigned long flags; | |
1939 | ||
1940 | LCACHE_LOCK(flags); | |
1941 | ||
1942 | lbmfree(bp); | |
1943 | ||
1944 | LCACHE_UNLOCK(flags); | |
1945 | } | |
1946 | ||
1947 | static void lbmfree(struct lbuf * bp) | |
1948 | { | |
1949 | struct jfs_log *log = bp->l_log; | |
1950 | ||
1951 | assert(bp->l_wqnext == NULL); | |
1952 | ||
1953 | /* | |
1954 | * return the buffer to head of freelist | |
1955 | */ | |
1956 | bp->l_freelist = log->lbuf_free; | |
1957 | log->lbuf_free = bp; | |
1958 | ||
1959 | wake_up(&log->free_wait); | |
1960 | return; | |
1961 | } | |
1962 | ||
1963 | ||
1964 | /* | |
1965 | * NAME: lbmRedrive | |
1966 | * | |
59c51591 | 1967 | * FUNCTION: add a log buffer to the log redrive list |
1da177e4 LT |
1968 | * |
1969 | * PARAMETER: | |
f720e3ba | 1970 | * bp - log buffer |
1da177e4 LT |
1971 | * |
1972 | * NOTES: | |
1973 | * Takes log_redrive_lock. | |
1974 | */ | |
1975 | static inline void lbmRedrive(struct lbuf *bp) | |
1976 | { | |
1977 | unsigned long flags; | |
1978 | ||
1979 | spin_lock_irqsave(&log_redrive_lock, flags); | |
1980 | bp->l_redrive_next = log_redrive_list; | |
1981 | log_redrive_list = bp; | |
1982 | spin_unlock_irqrestore(&log_redrive_lock, flags); | |
1983 | ||
91dbb4de | 1984 | wake_up_process(jfsIOthread); |
1da177e4 LT |
1985 | } |
1986 | ||
1987 | ||
1988 | /* | |
1989 | * lbmRead() | |
1990 | */ | |
1991 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) | |
1992 | { | |
1993 | struct bio *bio; | |
1994 | struct lbuf *bp; | |
1995 | ||
1996 | /* | |
1997 | * allocate a log buffer | |
1998 | */ | |
1999 | *bpp = bp = lbmAllocate(log, pn); | |
2000 | jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); | |
2001 | ||
2002 | bp->l_flag |= lbmREAD; | |
2003 | ||
2004 | bio = bio_alloc(GFP_NOFS, 1); | |
2005 | ||
2006 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
2007 | bio->bi_bdev = log->bdev; | |
dc5798d9 | 2008 | bio->bi_io_vec[0].bv_page = bp->l_page; |
1da177e4 | 2009 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
dc5798d9 | 2010 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
1da177e4 LT |
2011 | |
2012 | bio->bi_vcnt = 1; | |
2013 | bio->bi_idx = 0; | |
2014 | bio->bi_size = LOGPSIZE; | |
2015 | ||
2016 | bio->bi_end_io = lbmIODone; | |
2017 | bio->bi_private = bp; | |
2018 | submit_bio(READ_SYNC, bio); | |
2019 | ||
2020 | wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); | |
2021 | ||
2022 | return 0; | |
2023 | } | |
2024 | ||
2025 | ||
2026 | /* | |
2027 | * lbmWrite() | |
2028 | * | |
2029 | * buffer at head of pageout queue stays after completion of | |
2030 | * partial-page pageout and redriven by explicit initiation of | |
2031 | * pageout by caller until full-page pageout is completed and | |
2032 | * released. | |
2033 | * | |
2034 | * device driver i/o done redrives pageout of new buffer at | |
2035 | * head of pageout queue when current buffer at head of pageout | |
2036 | * queue is released at the completion of its full-page pageout. | |
2037 | * | |
2038 | * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). | |
2039 | * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() | |
2040 | */ | |
2041 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, | |
2042 | int cant_block) | |
2043 | { | |
2044 | struct lbuf *tail; | |
2045 | unsigned long flags; | |
2046 | ||
2047 | jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); | |
2048 | ||
2049 | /* map the logical block address to physical block address */ | |
2050 | bp->l_blkno = | |
2051 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2052 | ||
2053 | LCACHE_LOCK(flags); /* disable+lock */ | |
2054 | ||
2055 | /* | |
2056 | * initialize buffer for device driver | |
2057 | */ | |
2058 | bp->l_flag = flag; | |
2059 | ||
2060 | /* | |
f720e3ba | 2061 | * insert bp at tail of write queue associated with log |
1da177e4 LT |
2062 | * |
2063 | * (request is either for bp already/currently at head of queue | |
2064 | * or new bp to be inserted at tail) | |
2065 | */ | |
2066 | tail = log->wqueue; | |
2067 | ||
2068 | /* is buffer not already on write queue ? */ | |
2069 | if (bp->l_wqnext == NULL) { | |
2070 | /* insert at tail of wqueue */ | |
2071 | if (tail == NULL) { | |
2072 | log->wqueue = bp; | |
2073 | bp->l_wqnext = bp; | |
2074 | } else { | |
2075 | log->wqueue = bp; | |
2076 | bp->l_wqnext = tail->l_wqnext; | |
2077 | tail->l_wqnext = bp; | |
2078 | } | |
2079 | ||
2080 | tail = bp; | |
2081 | } | |
2082 | ||
2083 | /* is buffer at head of wqueue and for write ? */ | |
2084 | if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { | |
2085 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2086 | return; | |
2087 | } | |
2088 | ||
2089 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2090 | ||
2091 | if (cant_block) | |
2092 | lbmRedrive(bp); | |
2093 | else if (flag & lbmSYNC) | |
2094 | lbmStartIO(bp); | |
2095 | else { | |
2096 | LOGGC_UNLOCK(log); | |
2097 | lbmStartIO(bp); | |
2098 | LOGGC_LOCK(log); | |
2099 | } | |
2100 | } | |
2101 | ||
2102 | ||
2103 | /* | |
2104 | * lbmDirectWrite() | |
2105 | * | |
2106 | * initiate pageout bypassing write queue for sidestream | |
2107 | * (e.g., log superblock) write; | |
2108 | */ | |
2109 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) | |
2110 | { | |
2111 | jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", | |
2112 | bp, flag, bp->l_pn); | |
2113 | ||
2114 | /* | |
2115 | * initialize buffer for device driver | |
2116 | */ | |
2117 | bp->l_flag = flag | lbmDIRECT; | |
2118 | ||
2119 | /* map the logical block address to physical block address */ | |
2120 | bp->l_blkno = | |
2121 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2122 | ||
2123 | /* | |
f720e3ba | 2124 | * initiate pageout of the page |
1da177e4 LT |
2125 | */ |
2126 | lbmStartIO(bp); | |
2127 | } | |
2128 | ||
2129 | ||
2130 | /* | |
2131 | * NAME: lbmStartIO() | |
2132 | * | |
2133 | * FUNCTION: Interface to DD strategy routine | |
2134 | * | |
f720e3ba | 2135 | * RETURN: none |
1da177e4 LT |
2136 | * |
2137 | * serialization: LCACHE_LOCK() is NOT held during log i/o; | |
2138 | */ | |
2139 | static void lbmStartIO(struct lbuf * bp) | |
2140 | { | |
2141 | struct bio *bio; | |
2142 | struct jfs_log *log = bp->l_log; | |
2143 | ||
2144 | jfs_info("lbmStartIO\n"); | |
2145 | ||
2146 | bio = bio_alloc(GFP_NOFS, 1); | |
2147 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
2148 | bio->bi_bdev = log->bdev; | |
dc5798d9 | 2149 | bio->bi_io_vec[0].bv_page = bp->l_page; |
1da177e4 | 2150 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
dc5798d9 | 2151 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
1da177e4 LT |
2152 | |
2153 | bio->bi_vcnt = 1; | |
2154 | bio->bi_idx = 0; | |
2155 | bio->bi_size = LOGPSIZE; | |
2156 | ||
2157 | bio->bi_end_io = lbmIODone; | |
2158 | bio->bi_private = bp; | |
2159 | ||
2160 | /* check if journaling to disk has been disabled */ | |
dc5798d9 DK |
2161 | if (log->no_integrity) { |
2162 | bio->bi_size = 0; | |
e30408b2 | 2163 | lbmIODone(bio, 0); |
dc5798d9 | 2164 | } else { |
1da177e4 LT |
2165 | submit_bio(WRITE_SYNC, bio); |
2166 | INCREMENT(lmStat.submitted); | |
2167 | } | |
1da177e4 LT |
2168 | } |
2169 | ||
2170 | ||
2171 | /* | |
2172 | * lbmIOWait() | |
2173 | */ | |
2174 | static int lbmIOWait(struct lbuf * bp, int flag) | |
2175 | { | |
2176 | unsigned long flags; | |
2177 | int rc = 0; | |
2178 | ||
2179 | jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2180 | ||
2181 | LCACHE_LOCK(flags); /* disable+lock */ | |
2182 | ||
2183 | LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); | |
2184 | ||
2185 | rc = (bp->l_flag & lbmERROR) ? -EIO : 0; | |
2186 | ||
2187 | if (flag & lbmFREE) | |
2188 | lbmfree(bp); | |
2189 | ||
2190 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2191 | ||
2192 | jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2193 | return rc; | |
2194 | } | |
2195 | ||
2196 | /* | |
2197 | * lbmIODone() | |
2198 | * | |
2199 | * executed at INTIODONE level | |
2200 | */ | |
6712ecf8 | 2201 | static void lbmIODone(struct bio *bio, int error) |
1da177e4 LT |
2202 | { |
2203 | struct lbuf *bp = bio->bi_private; | |
2204 | struct lbuf *nextbp, *tail; | |
2205 | struct jfs_log *log; | |
2206 | unsigned long flags; | |
2207 | ||
1da177e4 LT |
2208 | /* |
2209 | * get back jfs buffer bound to the i/o buffer | |
2210 | */ | |
2211 | jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); | |
2212 | ||
2213 | LCACHE_LOCK(flags); /* disable+lock */ | |
2214 | ||
2215 | bp->l_flag |= lbmDONE; | |
2216 | ||
2217 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2218 | bp->l_flag |= lbmERROR; | |
2219 | ||
2220 | jfs_err("lbmIODone: I/O error in JFS log"); | |
2221 | } | |
2222 | ||
2223 | bio_put(bio); | |
2224 | ||
2225 | /* | |
f720e3ba | 2226 | * pagein completion |
1da177e4 LT |
2227 | */ |
2228 | if (bp->l_flag & lbmREAD) { | |
2229 | bp->l_flag &= ~lbmREAD; | |
2230 | ||
2231 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2232 | ||
2233 | /* wakeup I/O initiator */ | |
2234 | LCACHE_WAKEUP(&bp->l_ioevent); | |
8d8fe642 DK |
2235 | |
2236 | return; | |
1da177e4 LT |
2237 | } |
2238 | ||
2239 | /* | |
f720e3ba | 2240 | * pageout completion |
1da177e4 LT |
2241 | * |
2242 | * the bp at the head of write queue has completed pageout. | |
2243 | * | |
2244 | * if single-commit/full-page pageout, remove the current buffer | |
2245 | * from head of pageout queue, and redrive pageout with | |
2246 | * the new buffer at head of pageout queue; | |
2247 | * otherwise, the partial-page pageout buffer stays at | |
2248 | * the head of pageout queue to be redriven for pageout | |
2249 | * by lmGroupCommit() until full-page pageout is completed. | |
2250 | */ | |
2251 | bp->l_flag &= ~lbmWRITE; | |
2252 | INCREMENT(lmStat.pagedone); | |
2253 | ||
2254 | /* update committed lsn */ | |
2255 | log = bp->l_log; | |
2256 | log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; | |
2257 | ||
2258 | if (bp->l_flag & lbmDIRECT) { | |
2259 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2260 | LCACHE_UNLOCK(flags); | |
8d8fe642 | 2261 | return; |
1da177e4 LT |
2262 | } |
2263 | ||
2264 | tail = log->wqueue; | |
2265 | ||
2266 | /* single element queue */ | |
2267 | if (bp == tail) { | |
2268 | /* remove head buffer of full-page pageout | |
2269 | * from log device write queue | |
2270 | */ | |
2271 | if (bp->l_flag & lbmRELEASE) { | |
2272 | log->wqueue = NULL; | |
2273 | bp->l_wqnext = NULL; | |
2274 | } | |
2275 | } | |
2276 | /* multi element queue */ | |
2277 | else { | |
2278 | /* remove head buffer of full-page pageout | |
2279 | * from log device write queue | |
2280 | */ | |
2281 | if (bp->l_flag & lbmRELEASE) { | |
2282 | nextbp = tail->l_wqnext = bp->l_wqnext; | |
2283 | bp->l_wqnext = NULL; | |
2284 | ||
2285 | /* | |
2286 | * redrive pageout of next page at head of write queue: | |
2287 | * redrive next page without any bound tblk | |
2288 | * (i.e., page w/o any COMMIT records), or | |
2289 | * first page of new group commit which has been | |
2290 | * queued after current page (subsequent pageout | |
2291 | * is performed synchronously, except page without | |
2292 | * any COMMITs) by lmGroupCommit() as indicated | |
2293 | * by lbmWRITE flag; | |
2294 | */ | |
2295 | if (nextbp->l_flag & lbmWRITE) { | |
2296 | /* | |
2297 | * We can't do the I/O at interrupt time. | |
2298 | * The jfsIO thread can do it | |
2299 | */ | |
2300 | lbmRedrive(nextbp); | |
2301 | } | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | /* | |
f720e3ba | 2306 | * synchronous pageout: |
1da177e4 LT |
2307 | * |
2308 | * buffer has not necessarily been removed from write queue | |
2309 | * (e.g., synchronous write of partial-page with COMMIT): | |
2310 | * leave buffer for i/o initiator to dispose | |
2311 | */ | |
2312 | if (bp->l_flag & lbmSYNC) { | |
2313 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2314 | ||
2315 | /* wakeup I/O initiator */ | |
2316 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2317 | } | |
2318 | ||
2319 | /* | |
f720e3ba | 2320 | * Group Commit pageout: |
1da177e4 LT |
2321 | */ |
2322 | else if (bp->l_flag & lbmGC) { | |
2323 | LCACHE_UNLOCK(flags); | |
2324 | lmPostGC(bp); | |
2325 | } | |
2326 | ||
2327 | /* | |
f720e3ba | 2328 | * asynchronous pageout: |
1da177e4 LT |
2329 | * |
2330 | * buffer must have been removed from write queue: | |
2331 | * insert buffer at head of freelist where it can be recycled | |
2332 | */ | |
2333 | else { | |
2334 | assert(bp->l_flag & lbmRELEASE); | |
2335 | assert(bp->l_flag & lbmFREE); | |
2336 | lbmfree(bp); | |
2337 | ||
2338 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2339 | } | |
1da177e4 LT |
2340 | } |
2341 | ||
2342 | int jfsIOWait(void *arg) | |
2343 | { | |
2344 | struct lbuf *bp; | |
2345 | ||
1da177e4 | 2346 | do { |
1da177e4 | 2347 | spin_lock_irq(&log_redrive_lock); |
09aaa749 | 2348 | while ((bp = log_redrive_list)) { |
1da177e4 LT |
2349 | log_redrive_list = bp->l_redrive_next; |
2350 | bp->l_redrive_next = NULL; | |
2351 | spin_unlock_irq(&log_redrive_lock); | |
2352 | lbmStartIO(bp); | |
2353 | spin_lock_irq(&log_redrive_lock); | |
2354 | } | |
91dbb4de | 2355 | |
3e1d1d28 | 2356 | if (freezing(current)) { |
05ec9e26 | 2357 | spin_unlock_irq(&log_redrive_lock); |
3e1d1d28 | 2358 | refrigerator(); |
1da177e4 | 2359 | } else { |
1da177e4 | 2360 | set_current_state(TASK_INTERRUPTIBLE); |
05ec9e26 | 2361 | spin_unlock_irq(&log_redrive_lock); |
1da177e4 | 2362 | schedule(); |
3cbb1c8e | 2363 | __set_current_state(TASK_RUNNING); |
1da177e4 | 2364 | } |
91dbb4de | 2365 | } while (!kthread_should_stop()); |
1da177e4 LT |
2366 | |
2367 | jfs_info("jfsIOWait being killed!"); | |
91dbb4de | 2368 | return 0; |
1da177e4 LT |
2369 | } |
2370 | ||
2371 | /* | |
2372 | * NAME: lmLogFormat()/jfs_logform() | |
2373 | * | |
2374 | * FUNCTION: format file system log | |
2375 | * | |
2376 | * PARAMETERS: | |
f720e3ba | 2377 | * log - volume log |
1da177e4 LT |
2378 | * logAddress - start address of log space in FS block |
2379 | * logSize - length of log space in FS block; | |
2380 | * | |
2381 | * RETURN: 0 - success | |
2382 | * -EIO - i/o error | |
2383 | * | |
2384 | * XXX: We're synchronously writing one page at a time. This needs to | |
2385 | * be improved by writing multiple pages at once. | |
2386 | */ | |
2387 | int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) | |
2388 | { | |
2389 | int rc = -EIO; | |
2390 | struct jfs_sb_info *sbi; | |
2391 | struct logsuper *logsuper; | |
2392 | struct logpage *lp; | |
2393 | int lspn; /* log sequence page number */ | |
2394 | struct lrd *lrd_ptr; | |
2395 | int npages = 0; | |
2396 | struct lbuf *bp; | |
2397 | ||
2398 | jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", | |
2399 | (long long)logAddress, logSize); | |
2400 | ||
2401 | sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); | |
2402 | ||
2403 | /* allocate a log buffer */ | |
2404 | bp = lbmAllocate(log, 1); | |
2405 | ||
2406 | npages = logSize >> sbi->l2nbperpage; | |
2407 | ||
2408 | /* | |
f720e3ba | 2409 | * log space: |
1da177e4 LT |
2410 | * |
2411 | * page 0 - reserved; | |
2412 | * page 1 - log superblock; | |
2413 | * page 2 - log data page: A SYNC log record is written | |
f720e3ba | 2414 | * into this page at logform time; |
1da177e4 LT |
2415 | * pages 3-N - log data page: set to empty log data pages; |
2416 | */ | |
2417 | /* | |
f720e3ba | 2418 | * init log superblock: log page 1 |
1da177e4 LT |
2419 | */ |
2420 | logsuper = (struct logsuper *) bp->l_ldata; | |
2421 | ||
2422 | logsuper->magic = cpu_to_le32(LOGMAGIC); | |
2423 | logsuper->version = cpu_to_le32(LOGVERSION); | |
2424 | logsuper->state = cpu_to_le32(LOGREDONE); | |
2425 | logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ | |
2426 | logsuper->size = cpu_to_le32(npages); | |
2427 | logsuper->bsize = cpu_to_le32(sbi->bsize); | |
2428 | logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); | |
2429 | logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); | |
2430 | ||
2431 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2432 | bp->l_blkno = logAddress + sbi->nbperpage; | |
2433 | lbmStartIO(bp); | |
2434 | if ((rc = lbmIOWait(bp, 0))) | |
2435 | goto exit; | |
2436 | ||
2437 | /* | |
f720e3ba | 2438 | * init pages 2 to npages-1 as log data pages: |
1da177e4 LT |
2439 | * |
2440 | * log page sequence number (lpsn) initialization: | |
2441 | * | |
2442 | * pn: 0 1 2 3 n-1 | |
2443 | * +-----+-----+=====+=====+===.....===+=====+ | |
2444 | * lspn: N-1 0 1 N-2 | |
2445 | * <--- N page circular file ----> | |
2446 | * | |
2447 | * the N (= npages-2) data pages of the log is maintained as | |
2448 | * a circular file for the log records; | |
2449 | * lpsn grows by 1 monotonically as each log page is written | |
2450 | * to the circular file of the log; | |
2451 | * and setLogpage() will not reset the page number even if | |
2452 | * the eor is equal to LOGPHDRSIZE. In order for binary search | |
2453 | * still work in find log end process, we have to simulate the | |
2454 | * log wrap situation at the log format time. | |
2455 | * The 1st log page written will have the highest lpsn. Then | |
2456 | * the succeeding log pages will have ascending order of | |
2457 | * the lspn starting from 0, ... (N-2) | |
2458 | */ | |
2459 | lp = (struct logpage *) bp->l_ldata; | |
2460 | /* | |
2461 | * initialize 1st log page to be written: lpsn = N - 1, | |
2462 | * write a SYNCPT log record is written to this page | |
2463 | */ | |
2464 | lp->h.page = lp->t.page = cpu_to_le32(npages - 3); | |
2465 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); | |
2466 | ||
2467 | lrd_ptr = (struct lrd *) &lp->data; | |
2468 | lrd_ptr->logtid = 0; | |
2469 | lrd_ptr->backchain = 0; | |
2470 | lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); | |
2471 | lrd_ptr->length = 0; | |
2472 | lrd_ptr->log.syncpt.sync = 0; | |
2473 | ||
2474 | bp->l_blkno += sbi->nbperpage; | |
2475 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2476 | lbmStartIO(bp); | |
2477 | if ((rc = lbmIOWait(bp, 0))) | |
2478 | goto exit; | |
2479 | ||
2480 | /* | |
f720e3ba | 2481 | * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) |
1da177e4 LT |
2482 | */ |
2483 | for (lspn = 0; lspn < npages - 3; lspn++) { | |
2484 | lp->h.page = lp->t.page = cpu_to_le32(lspn); | |
2485 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
2486 | ||
2487 | bp->l_blkno += sbi->nbperpage; | |
2488 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2489 | lbmStartIO(bp); | |
2490 | if ((rc = lbmIOWait(bp, 0))) | |
2491 | goto exit; | |
2492 | } | |
2493 | ||
2494 | rc = 0; | |
2495 | exit: | |
2496 | /* | |
f720e3ba | 2497 | * finalize log |
1da177e4 LT |
2498 | */ |
2499 | /* release the buffer */ | |
2500 | lbmFree(bp); | |
2501 | ||
2502 | return rc; | |
2503 | } | |
2504 | ||
2505 | #ifdef CONFIG_JFS_STATISTICS | |
2506 | int jfs_lmstats_read(char *buffer, char **start, off_t offset, int length, | |
2507 | int *eof, void *data) | |
2508 | { | |
2509 | int len = 0; | |
2510 | off_t begin; | |
2511 | ||
2512 | len += sprintf(buffer, | |
2513 | "JFS Logmgr stats\n" | |
2514 | "================\n" | |
2515 | "commits = %d\n" | |
2516 | "writes submitted = %d\n" | |
2517 | "writes completed = %d\n" | |
2518 | "full pages submitted = %d\n" | |
2519 | "partial pages submitted = %d\n", | |
2520 | lmStat.commit, | |
2521 | lmStat.submitted, | |
2522 | lmStat.pagedone, | |
2523 | lmStat.full_page, | |
2524 | lmStat.partial_page); | |
2525 | ||
2526 | begin = offset; | |
2527 | *start = buffer + begin; | |
2528 | len -= begin; | |
2529 | ||
2530 | if (len > length) | |
2531 | len = length; | |
2532 | else | |
2533 | *eof = 1; | |
2534 | ||
2535 | if (len < 0) | |
2536 | len = 0; | |
2537 | ||
2538 | return len; | |
2539 | } | |
2540 | #endif /* CONFIG_JFS_STATISTICS */ |