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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> |
afeacc8c | 70 | #include <linux/export.h> |
1da177e4 | 71 | #include <linux/delay.h> |
353ab6e9 | 72 | #include <linux/mutex.h> |
b2e03ca7 | 73 | #include <linux/seq_file.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 LT |
75 | #include "jfs_incore.h" |
76 | #include "jfs_filsys.h" | |
77 | #include "jfs_metapage.h" | |
1868f4aa | 78 | #include "jfs_superblock.h" |
1da177e4 LT |
79 | #include "jfs_txnmgr.h" |
80 | #include "jfs_debug.h" | |
81 | ||
82 | ||
83 | /* | |
84 | * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) | |
85 | */ | |
86 | static struct lbuf *log_redrive_list; | |
87 | static DEFINE_SPINLOCK(log_redrive_lock); | |
1da177e4 LT |
88 | |
89 | ||
90 | /* | |
91 | * log read/write serialization (per log) | |
92 | */ | |
1de87444 IM |
93 | #define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) |
94 | #define LOG_LOCK(log) mutex_lock(&((log)->loglock)) | |
95 | #define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock)) | |
1da177e4 LT |
96 | |
97 | ||
98 | /* | |
99 | * log group commit serialization (per log) | |
100 | */ | |
101 | ||
102 | #define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) | |
103 | #define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) | |
104 | #define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) | |
105 | #define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) | |
106 | ||
107 | /* | |
108 | * log sync serialization (per log) | |
109 | */ | |
110 | #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) | |
111 | #define LOGSYNC_BARRIER(logsize) ((logsize)/4) | |
112 | /* | |
113 | #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) | |
114 | #define LOGSYNC_BARRIER(logsize) ((logsize)/2) | |
115 | */ | |
116 | ||
117 | ||
118 | /* | |
119 | * log buffer cache synchronization | |
120 | */ | |
121 | static DEFINE_SPINLOCK(jfsLCacheLock); | |
122 | ||
123 | #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) | |
124 | #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) | |
125 | ||
126 | /* | |
127 | * See __SLEEP_COND in jfs_locks.h | |
128 | */ | |
129 | #define LCACHE_SLEEP_COND(wq, cond, flags) \ | |
130 | do { \ | |
131 | if (cond) \ | |
132 | break; \ | |
133 | __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ | |
134 | } while (0) | |
135 | ||
136 | #define LCACHE_WAKEUP(event) wake_up(event) | |
137 | ||
138 | ||
139 | /* | |
140 | * lbuf buffer cache (lCache) control | |
141 | */ | |
142 | /* log buffer manager pageout control (cumulative, inclusive) */ | |
143 | #define lbmREAD 0x0001 | |
144 | #define lbmWRITE 0x0002 /* enqueue at tail of write queue; | |
145 | * init pageout if at head of queue; | |
146 | */ | |
147 | #define lbmRELEASE 0x0004 /* remove from write queue | |
148 | * at completion of pageout; | |
149 | * do not free/recycle it yet: | |
150 | * caller will free it; | |
151 | */ | |
152 | #define lbmSYNC 0x0008 /* do not return to freelist | |
153 | * when removed from write queue; | |
154 | */ | |
155 | #define lbmFREE 0x0010 /* return to freelist | |
156 | * at completion of pageout; | |
157 | * the buffer may be recycled; | |
158 | */ | |
159 | #define lbmDONE 0x0020 | |
160 | #define lbmERROR 0x0040 | |
161 | #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing | |
162 | * of log page | |
163 | */ | |
164 | #define lbmDIRECT 0x0100 | |
165 | ||
166 | /* | |
167 | * Global list of active external journals | |
168 | */ | |
169 | static LIST_HEAD(jfs_external_logs); | |
170 | static struct jfs_log *dummy_log = NULL; | |
353ab6e9 | 171 | static DEFINE_MUTEX(jfs_log_mutex); |
1da177e4 | 172 | |
1da177e4 LT |
173 | /* |
174 | * forward references | |
175 | */ | |
176 | static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, | |
177 | struct lrd * lrd, struct tlock * tlck); | |
178 | ||
179 | static int lmNextPage(struct jfs_log * log); | |
180 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
181 | int activate); | |
182 | ||
183 | static int open_inline_log(struct super_block *sb); | |
184 | static int open_dummy_log(struct super_block *sb); | |
185 | static int lbmLogInit(struct jfs_log * log); | |
186 | static void lbmLogShutdown(struct jfs_log * log); | |
187 | static struct lbuf *lbmAllocate(struct jfs_log * log, int); | |
188 | static void lbmFree(struct lbuf * bp); | |
189 | static void lbmfree(struct lbuf * bp); | |
190 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); | |
191 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); | |
192 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); | |
193 | static int lbmIOWait(struct lbuf * bp, int flag); | |
194 | static bio_end_io_t lbmIODone; | |
195 | static void lbmStartIO(struct lbuf * bp); | |
196 | static void lmGCwrite(struct jfs_log * log, int cant_block); | |
cbc3d65e | 197 | static int lmLogSync(struct jfs_log * log, int hard_sync); |
1da177e4 LT |
198 | |
199 | ||
200 | ||
201 | /* | |
202 | * statistics | |
203 | */ | |
204 | #ifdef CONFIG_JFS_STATISTICS | |
205 | static struct lmStat { | |
206 | uint commit; /* # of commit */ | |
207 | uint pagedone; /* # of page written */ | |
208 | uint submitted; /* # of pages submitted */ | |
209 | uint full_page; /* # of full pages submitted */ | |
210 | uint partial_page; /* # of partial pages submitted */ | |
211 | } lmStat; | |
212 | #endif | |
213 | ||
67e6682f DK |
214 | static void write_special_inodes(struct jfs_log *log, |
215 | int (*writer)(struct address_space *)) | |
216 | { | |
217 | struct jfs_sb_info *sbi; | |
218 | ||
219 | list_for_each_entry(sbi, &log->sb_list, log_list) { | |
220 | writer(sbi->ipbmap->i_mapping); | |
221 | writer(sbi->ipimap->i_mapping); | |
222 | writer(sbi->direct_inode->i_mapping); | |
223 | } | |
224 | } | |
1da177e4 LT |
225 | |
226 | /* | |
227 | * NAME: lmLog() | |
228 | * | |
229 | * FUNCTION: write a log record; | |
230 | * | |
231 | * PARAMETER: | |
232 | * | |
233 | * RETURN: lsn - offset to the next log record to write (end-of-log); | |
234 | * -1 - error; | |
235 | * | |
236 | * note: todo: log error handler | |
237 | */ | |
238 | int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
239 | struct tlock * tlck) | |
240 | { | |
241 | int lsn; | |
242 | int diffp, difft; | |
243 | struct metapage *mp = NULL; | |
7fab479b | 244 | unsigned long flags; |
1da177e4 LT |
245 | |
246 | jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", | |
247 | log, tblk, lrd, tlck); | |
248 | ||
249 | LOG_LOCK(log); | |
250 | ||
251 | /* log by (out-of-transaction) JFS ? */ | |
252 | if (tblk == NULL) | |
253 | goto writeRecord; | |
254 | ||
255 | /* log from page ? */ | |
256 | if (tlck == NULL || | |
257 | tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) | |
258 | goto writeRecord; | |
259 | ||
260 | /* | |
f720e3ba | 261 | * initialize/update page/transaction recovery lsn |
1da177e4 LT |
262 | */ |
263 | lsn = log->lsn; | |
264 | ||
7fab479b | 265 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
266 | |
267 | /* | |
268 | * initialize page lsn if first log write of the page | |
269 | */ | |
270 | if (mp->lsn == 0) { | |
271 | mp->log = log; | |
272 | mp->lsn = lsn; | |
273 | log->count++; | |
274 | ||
275 | /* insert page at tail of logsynclist */ | |
276 | list_add_tail(&mp->synclist, &log->synclist); | |
277 | } | |
278 | ||
279 | /* | |
f720e3ba | 280 | * initialize/update lsn of tblock of the page |
1da177e4 LT |
281 | * |
282 | * transaction inherits oldest lsn of pages associated | |
283 | * with allocation/deallocation of resources (their | |
284 | * log records are used to reconstruct allocation map | |
285 | * at recovery time: inode for inode allocation map, | |
286 | * B+-tree index of extent descriptors for block | |
287 | * allocation map); | |
288 | * allocation map pages inherit transaction lsn at | |
289 | * commit time to allow forwarding log syncpt past log | |
290 | * records associated with allocation/deallocation of | |
291 | * resources only after persistent map of these map pages | |
292 | * have been updated and propagated to home. | |
293 | */ | |
294 | /* | |
295 | * initialize transaction lsn: | |
296 | */ | |
297 | if (tblk->lsn == 0) { | |
298 | /* inherit lsn of its first page logged */ | |
299 | tblk->lsn = mp->lsn; | |
300 | log->count++; | |
301 | ||
302 | /* insert tblock after the page on logsynclist */ | |
303 | list_add(&tblk->synclist, &mp->synclist); | |
304 | } | |
305 | /* | |
306 | * update transaction lsn: | |
307 | */ | |
308 | else { | |
309 | /* inherit oldest/smallest lsn of page */ | |
310 | logdiff(diffp, mp->lsn, log); | |
311 | logdiff(difft, tblk->lsn, log); | |
312 | if (diffp < difft) { | |
313 | /* update tblock lsn with page lsn */ | |
314 | tblk->lsn = mp->lsn; | |
315 | ||
316 | /* move tblock after page on logsynclist */ | |
317 | list_move(&tblk->synclist, &mp->synclist); | |
318 | } | |
319 | } | |
320 | ||
7fab479b | 321 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
322 | |
323 | /* | |
f720e3ba | 324 | * write the log record |
1da177e4 LT |
325 | */ |
326 | writeRecord: | |
327 | lsn = lmWriteRecord(log, tblk, lrd, tlck); | |
328 | ||
329 | /* | |
330 | * forward log syncpt if log reached next syncpt trigger | |
331 | */ | |
332 | logdiff(diffp, lsn, log); | |
333 | if (diffp >= log->nextsync) | |
334 | lsn = lmLogSync(log, 0); | |
335 | ||
336 | /* update end-of-log lsn */ | |
337 | log->lsn = lsn; | |
338 | ||
339 | LOG_UNLOCK(log); | |
340 | ||
341 | /* return end-of-log address */ | |
342 | return lsn; | |
343 | } | |
344 | ||
1da177e4 LT |
345 | /* |
346 | * NAME: lmWriteRecord() | |
347 | * | |
348 | * FUNCTION: move the log record to current log page | |
349 | * | |
350 | * PARAMETER: cd - commit descriptor | |
351 | * | |
352 | * RETURN: end-of-log address | |
63f83c9f | 353 | * |
1da177e4 LT |
354 | * serialization: LOG_LOCK() held on entry/exit |
355 | */ | |
356 | static int | |
357 | lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
358 | struct tlock * tlck) | |
359 | { | |
360 | int lsn = 0; /* end-of-log address */ | |
361 | struct lbuf *bp; /* dst log page buffer */ | |
362 | struct logpage *lp; /* dst log page */ | |
363 | caddr_t dst; /* destination address in log page */ | |
364 | int dstoffset; /* end-of-log offset in log page */ | |
365 | int freespace; /* free space in log page */ | |
366 | caddr_t p; /* src meta-data page */ | |
367 | caddr_t src; | |
368 | int srclen; | |
369 | int nbytes; /* number of bytes to move */ | |
370 | int i; | |
371 | int len; | |
372 | struct linelock *linelock; | |
373 | struct lv *lv; | |
374 | struct lvd *lvd; | |
375 | int l2linesize; | |
376 | ||
377 | len = 0; | |
378 | ||
379 | /* retrieve destination log page to write */ | |
380 | bp = (struct lbuf *) log->bp; | |
381 | lp = (struct logpage *) bp->l_ldata; | |
382 | dstoffset = log->eor; | |
383 | ||
384 | /* any log data to write ? */ | |
385 | if (tlck == NULL) | |
386 | goto moveLrd; | |
387 | ||
388 | /* | |
f720e3ba | 389 | * move log record data |
1da177e4 LT |
390 | */ |
391 | /* retrieve source meta-data page to log */ | |
392 | if (tlck->flag & tlckPAGELOCK) { | |
393 | p = (caddr_t) (tlck->mp->data); | |
394 | linelock = (struct linelock *) & tlck->lock; | |
395 | } | |
396 | /* retrieve source in-memory inode to log */ | |
397 | else if (tlck->flag & tlckINODELOCK) { | |
398 | if (tlck->type & tlckDTREE) | |
399 | p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; | |
400 | else | |
401 | p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; | |
402 | linelock = (struct linelock *) & tlck->lock; | |
403 | } | |
404 | #ifdef _JFS_WIP | |
405 | else if (tlck->flag & tlckINLINELOCK) { | |
406 | ||
407 | inlinelock = (struct inlinelock *) & tlck; | |
408 | p = (caddr_t) & inlinelock->pxd; | |
409 | linelock = (struct linelock *) & tlck; | |
410 | } | |
411 | #endif /* _JFS_WIP */ | |
412 | else { | |
413 | jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); | |
414 | return 0; /* Probably should trap */ | |
415 | } | |
416 | l2linesize = linelock->l2linesize; | |
417 | ||
418 | moveData: | |
419 | ASSERT(linelock->index <= linelock->maxcnt); | |
420 | ||
421 | lv = linelock->lv; | |
422 | for (i = 0; i < linelock->index; i++, lv++) { | |
423 | if (lv->length == 0) | |
424 | continue; | |
425 | ||
426 | /* is page full ? */ | |
427 | if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { | |
428 | /* page become full: move on to next page */ | |
429 | lmNextPage(log); | |
430 | ||
431 | bp = log->bp; | |
432 | lp = (struct logpage *) bp->l_ldata; | |
433 | dstoffset = LOGPHDRSIZE; | |
434 | } | |
435 | ||
436 | /* | |
437 | * move log vector data | |
438 | */ | |
439 | src = (u8 *) p + (lv->offset << l2linesize); | |
440 | srclen = lv->length << l2linesize; | |
441 | len += srclen; | |
442 | while (srclen > 0) { | |
443 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
444 | nbytes = min(freespace, srclen); | |
445 | dst = (caddr_t) lp + dstoffset; | |
446 | memcpy(dst, src, nbytes); | |
447 | dstoffset += nbytes; | |
448 | ||
449 | /* is page not full ? */ | |
450 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
451 | break; | |
452 | ||
453 | /* page become full: move on to next page */ | |
454 | lmNextPage(log); | |
455 | ||
456 | bp = (struct lbuf *) log->bp; | |
457 | lp = (struct logpage *) bp->l_ldata; | |
458 | dstoffset = LOGPHDRSIZE; | |
459 | ||
460 | srclen -= nbytes; | |
461 | src += nbytes; | |
462 | } | |
463 | ||
464 | /* | |
465 | * move log vector descriptor | |
466 | */ | |
467 | len += 4; | |
468 | lvd = (struct lvd *) ((caddr_t) lp + dstoffset); | |
469 | lvd->offset = cpu_to_le16(lv->offset); | |
470 | lvd->length = cpu_to_le16(lv->length); | |
471 | dstoffset += 4; | |
472 | jfs_info("lmWriteRecord: lv offset:%d length:%d", | |
473 | lv->offset, lv->length); | |
474 | } | |
475 | ||
476 | if ((i = linelock->next)) { | |
477 | linelock = (struct linelock *) lid_to_tlock(i); | |
478 | goto moveData; | |
479 | } | |
480 | ||
481 | /* | |
f720e3ba | 482 | * move log record descriptor |
1da177e4 LT |
483 | */ |
484 | moveLrd: | |
485 | lrd->length = cpu_to_le16(len); | |
486 | ||
487 | src = (caddr_t) lrd; | |
488 | srclen = LOGRDSIZE; | |
489 | ||
490 | while (srclen > 0) { | |
491 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
492 | nbytes = min(freespace, srclen); | |
493 | dst = (caddr_t) lp + dstoffset; | |
494 | memcpy(dst, src, nbytes); | |
495 | ||
496 | dstoffset += nbytes; | |
497 | srclen -= nbytes; | |
498 | ||
499 | /* are there more to move than freespace of page ? */ | |
500 | if (srclen) | |
501 | goto pageFull; | |
502 | ||
503 | /* | |
504 | * end of log record descriptor | |
505 | */ | |
506 | ||
507 | /* update last log record eor */ | |
508 | log->eor = dstoffset; | |
509 | bp->l_eor = dstoffset; | |
510 | lsn = (log->page << L2LOGPSIZE) + dstoffset; | |
511 | ||
512 | if (lrd->type & cpu_to_le16(LOG_COMMIT)) { | |
513 | tblk->clsn = lsn; | |
514 | jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, | |
515 | bp->l_eor); | |
516 | ||
517 | INCREMENT(lmStat.commit); /* # of commit */ | |
518 | ||
519 | /* | |
520 | * enqueue tblock for group commit: | |
521 | * | |
522 | * enqueue tblock of non-trivial/synchronous COMMIT | |
523 | * at tail of group commit queue | |
524 | * (trivial/asynchronous COMMITs are ignored by | |
525 | * group commit.) | |
526 | */ | |
527 | LOGGC_LOCK(log); | |
528 | ||
529 | /* init tblock gc state */ | |
530 | tblk->flag = tblkGC_QUEUE; | |
531 | tblk->bp = log->bp; | |
532 | tblk->pn = log->page; | |
533 | tblk->eor = log->eor; | |
534 | ||
535 | /* enqueue transaction to commit queue */ | |
536 | list_add_tail(&tblk->cqueue, &log->cqueue); | |
537 | ||
538 | LOGGC_UNLOCK(log); | |
539 | } | |
540 | ||
541 | jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", | |
542 | le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); | |
543 | ||
544 | /* page not full ? */ | |
545 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
546 | return lsn; | |
547 | ||
548 | pageFull: | |
549 | /* page become full: move on to next page */ | |
550 | lmNextPage(log); | |
551 | ||
552 | bp = (struct lbuf *) log->bp; | |
553 | lp = (struct logpage *) bp->l_ldata; | |
554 | dstoffset = LOGPHDRSIZE; | |
555 | src += nbytes; | |
556 | } | |
557 | ||
558 | return lsn; | |
559 | } | |
560 | ||
561 | ||
562 | /* | |
563 | * NAME: lmNextPage() | |
564 | * | |
565 | * FUNCTION: write current page and allocate next page. | |
566 | * | |
567 | * PARAMETER: log | |
568 | * | |
569 | * RETURN: 0 | |
63f83c9f | 570 | * |
1da177e4 LT |
571 | * serialization: LOG_LOCK() held on entry/exit |
572 | */ | |
573 | static int lmNextPage(struct jfs_log * log) | |
574 | { | |
575 | struct logpage *lp; | |
576 | int lspn; /* log sequence page number */ | |
577 | int pn; /* current page number */ | |
578 | struct lbuf *bp; | |
579 | struct lbuf *nextbp; | |
580 | struct tblock *tblk; | |
581 | ||
582 | /* get current log page number and log sequence page number */ | |
583 | pn = log->page; | |
584 | bp = log->bp; | |
585 | lp = (struct logpage *) bp->l_ldata; | |
586 | lspn = le32_to_cpu(lp->h.page); | |
587 | ||
588 | LOGGC_LOCK(log); | |
589 | ||
590 | /* | |
f720e3ba | 591 | * write or queue the full page at the tail of write queue |
1da177e4 LT |
592 | */ |
593 | /* get the tail tblk on commit queue */ | |
594 | if (list_empty(&log->cqueue)) | |
595 | tblk = NULL; | |
596 | else | |
597 | tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
598 | ||
599 | /* every tblk who has COMMIT record on the current page, | |
600 | * and has not been committed, must be on commit queue | |
601 | * since tblk is queued at commit queueu at the time | |
602 | * of writing its COMMIT record on the page before | |
603 | * page becomes full (even though the tblk thread | |
604 | * who wrote COMMIT record may have been suspended | |
605 | * currently); | |
606 | */ | |
607 | ||
608 | /* is page bound with outstanding tail tblk ? */ | |
609 | if (tblk && tblk->pn == pn) { | |
610 | /* mark tblk for end-of-page */ | |
611 | tblk->flag |= tblkGC_EOP; | |
612 | ||
613 | if (log->cflag & logGC_PAGEOUT) { | |
614 | /* if page is not already on write queue, | |
615 | * just enqueue (no lbmWRITE to prevent redrive) | |
616 | * buffer to wqueue to ensure correct serial order | |
617 | * of the pages since log pages will be added | |
618 | * continuously | |
619 | */ | |
620 | if (bp->l_wqnext == NULL) | |
621 | lbmWrite(log, bp, 0, 0); | |
622 | } else { | |
623 | /* | |
624 | * No current GC leader, initiate group commit | |
625 | */ | |
626 | log->cflag |= logGC_PAGEOUT; | |
627 | lmGCwrite(log, 0); | |
628 | } | |
629 | } | |
630 | /* page is not bound with outstanding tblk: | |
631 | * init write or mark it to be redriven (lbmWRITE) | |
632 | */ | |
633 | else { | |
634 | /* finalize the page */ | |
635 | bp->l_ceor = bp->l_eor; | |
636 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
637 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); | |
638 | } | |
639 | LOGGC_UNLOCK(log); | |
640 | ||
641 | /* | |
f720e3ba | 642 | * allocate/initialize next page |
1da177e4 LT |
643 | */ |
644 | /* if log wraps, the first data page of log is 2 | |
645 | * (0 never used, 1 is superblock). | |
646 | */ | |
647 | log->page = (pn == log->size - 1) ? 2 : pn + 1; | |
648 | log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ | |
649 | ||
650 | /* allocate/initialize next log page buffer */ | |
651 | nextbp = lbmAllocate(log, log->page); | |
652 | nextbp->l_eor = log->eor; | |
653 | log->bp = nextbp; | |
654 | ||
655 | /* initialize next log page */ | |
656 | lp = (struct logpage *) nextbp->l_ldata; | |
657 | lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); | |
658 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | ||
664 | /* | |
665 | * NAME: lmGroupCommit() | |
666 | * | |
667 | * FUNCTION: group commit | |
668 | * initiate pageout of the pages with COMMIT in the order of | |
669 | * page number - redrive pageout of the page at the head of | |
670 | * pageout queue until full page has been written. | |
671 | * | |
63f83c9f | 672 | * RETURN: |
1da177e4 LT |
673 | * |
674 | * NOTE: | |
675 | * LOGGC_LOCK serializes log group commit queue, and | |
676 | * transaction blocks on the commit queue. | |
677 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
678 | */ | |
679 | int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) | |
680 | { | |
681 | int rc = 0; | |
682 | ||
683 | LOGGC_LOCK(log); | |
684 | ||
685 | /* group committed already ? */ | |
686 | if (tblk->flag & tblkGC_COMMITTED) { | |
687 | if (tblk->flag & tblkGC_ERROR) | |
688 | rc = -EIO; | |
689 | ||
690 | LOGGC_UNLOCK(log); | |
691 | return rc; | |
692 | } | |
693 | jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); | |
694 | ||
695 | if (tblk->xflag & COMMIT_LAZY) | |
696 | tblk->flag |= tblkGC_LAZY; | |
697 | ||
698 | if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && | |
699 | (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) | |
700 | || jfs_tlocks_low)) { | |
701 | /* | |
702 | * No pageout in progress | |
703 | * | |
704 | * start group commit as its group leader. | |
705 | */ | |
706 | log->cflag |= logGC_PAGEOUT; | |
707 | ||
708 | lmGCwrite(log, 0); | |
709 | } | |
710 | ||
711 | if (tblk->xflag & COMMIT_LAZY) { | |
712 | /* | |
713 | * Lazy transactions can leave now | |
714 | */ | |
715 | LOGGC_UNLOCK(log); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | /* lmGCwrite gives up LOGGC_LOCK, check again */ | |
720 | ||
721 | if (tblk->flag & tblkGC_COMMITTED) { | |
722 | if (tblk->flag & tblkGC_ERROR) | |
723 | rc = -EIO; | |
724 | ||
725 | LOGGC_UNLOCK(log); | |
726 | return rc; | |
727 | } | |
728 | ||
729 | /* upcount transaction waiting for completion | |
730 | */ | |
731 | log->gcrtc++; | |
732 | tblk->flag |= tblkGC_READY; | |
733 | ||
734 | __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), | |
735 | LOGGC_LOCK(log), LOGGC_UNLOCK(log)); | |
736 | ||
737 | /* removed from commit queue */ | |
738 | if (tblk->flag & tblkGC_ERROR) | |
739 | rc = -EIO; | |
740 | ||
741 | LOGGC_UNLOCK(log); | |
742 | return rc; | |
743 | } | |
744 | ||
745 | /* | |
746 | * NAME: lmGCwrite() | |
747 | * | |
748 | * FUNCTION: group commit write | |
749 | * initiate write of log page, building a group of all transactions | |
750 | * with commit records on that page. | |
751 | * | |
752 | * RETURN: None | |
753 | * | |
754 | * NOTE: | |
755 | * LOGGC_LOCK must be held by caller. | |
756 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
757 | */ | |
758 | static void lmGCwrite(struct jfs_log * log, int cant_write) | |
759 | { | |
760 | struct lbuf *bp; | |
761 | struct logpage *lp; | |
762 | int gcpn; /* group commit page number */ | |
763 | struct tblock *tblk; | |
764 | struct tblock *xtblk = NULL; | |
765 | ||
766 | /* | |
767 | * build the commit group of a log page | |
768 | * | |
769 | * scan commit queue and make a commit group of all | |
770 | * transactions with COMMIT records on the same log page. | |
771 | */ | |
772 | /* get the head tblk on the commit queue */ | |
773 | gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; | |
774 | ||
775 | list_for_each_entry(tblk, &log->cqueue, cqueue) { | |
776 | if (tblk->pn != gcpn) | |
777 | break; | |
778 | ||
779 | xtblk = tblk; | |
780 | ||
781 | /* state transition: (QUEUE, READY) -> COMMIT */ | |
782 | tblk->flag |= tblkGC_COMMIT; | |
783 | } | |
784 | tblk = xtblk; /* last tblk of the page */ | |
785 | ||
786 | /* | |
787 | * pageout to commit transactions on the log page. | |
788 | */ | |
789 | bp = (struct lbuf *) tblk->bp; | |
790 | lp = (struct logpage *) bp->l_ldata; | |
791 | /* is page already full ? */ | |
792 | if (tblk->flag & tblkGC_EOP) { | |
793 | /* mark page to free at end of group commit of the page */ | |
794 | tblk->flag &= ~tblkGC_EOP; | |
795 | tblk->flag |= tblkGC_FREE; | |
796 | bp->l_ceor = bp->l_eor; | |
797 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
798 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, | |
799 | cant_write); | |
800 | INCREMENT(lmStat.full_page); | |
801 | } | |
802 | /* page is not yet full */ | |
803 | else { | |
804 | bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ | |
805 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
806 | lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); | |
807 | INCREMENT(lmStat.partial_page); | |
808 | } | |
809 | } | |
810 | ||
811 | /* | |
812 | * NAME: lmPostGC() | |
813 | * | |
814 | * FUNCTION: group commit post-processing | |
815 | * Processes transactions after their commit records have been written | |
816 | * to disk, redriving log I/O if necessary. | |
817 | * | |
818 | * RETURN: None | |
819 | * | |
820 | * NOTE: | |
821 | * This routine is called a interrupt time by lbmIODone | |
822 | */ | |
823 | static void lmPostGC(struct lbuf * bp) | |
824 | { | |
825 | unsigned long flags; | |
826 | struct jfs_log *log = bp->l_log; | |
827 | struct logpage *lp; | |
828 | struct tblock *tblk, *temp; | |
829 | ||
830 | //LOGGC_LOCK(log); | |
831 | spin_lock_irqsave(&log->gclock, flags); | |
832 | /* | |
833 | * current pageout of group commit completed. | |
834 | * | |
835 | * remove/wakeup transactions from commit queue who were | |
836 | * group committed with the current log page | |
837 | */ | |
838 | list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { | |
839 | if (!(tblk->flag & tblkGC_COMMIT)) | |
840 | break; | |
841 | /* if transaction was marked GC_COMMIT then | |
842 | * it has been shipped in the current pageout | |
843 | * and made it to disk - it is committed. | |
844 | */ | |
845 | ||
846 | if (bp->l_flag & lbmERROR) | |
847 | tblk->flag |= tblkGC_ERROR; | |
848 | ||
849 | /* remove it from the commit queue */ | |
850 | list_del(&tblk->cqueue); | |
851 | tblk->flag &= ~tblkGC_QUEUE; | |
852 | ||
853 | if (tblk == log->flush_tblk) { | |
854 | /* we can stop flushing the log now */ | |
855 | clear_bit(log_FLUSH, &log->flag); | |
856 | log->flush_tblk = NULL; | |
857 | } | |
858 | ||
859 | jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, | |
860 | tblk->flag); | |
861 | ||
862 | if (!(tblk->xflag & COMMIT_FORCE)) | |
863 | /* | |
864 | * Hand tblk over to lazy commit thread | |
865 | */ | |
866 | txLazyUnlock(tblk); | |
867 | else { | |
868 | /* state transition: COMMIT -> COMMITTED */ | |
869 | tblk->flag |= tblkGC_COMMITTED; | |
870 | ||
871 | if (tblk->flag & tblkGC_READY) | |
872 | log->gcrtc--; | |
873 | ||
874 | LOGGC_WAKEUP(tblk); | |
875 | } | |
876 | ||
877 | /* was page full before pageout ? | |
878 | * (and this is the last tblk bound with the page) | |
879 | */ | |
880 | if (tblk->flag & tblkGC_FREE) | |
881 | lbmFree(bp); | |
882 | /* did page become full after pageout ? | |
883 | * (and this is the last tblk bound with the page) | |
884 | */ | |
885 | else if (tblk->flag & tblkGC_EOP) { | |
886 | /* finalize the page */ | |
887 | lp = (struct logpage *) bp->l_ldata; | |
888 | bp->l_ceor = bp->l_eor; | |
889 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
890 | jfs_info("lmPostGC: calling lbmWrite"); | |
891 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, | |
892 | 1); | |
893 | } | |
894 | ||
895 | } | |
896 | ||
897 | /* are there any transactions who have entered lnGroupCommit() | |
898 | * (whose COMMITs are after that of the last log page written. | |
899 | * They are waiting for new group commit (above at (SLEEP 1)) | |
900 | * or lazy transactions are on a full (queued) log page, | |
901 | * select the latest ready transaction as new group leader and | |
902 | * wake her up to lead her group. | |
903 | */ | |
904 | if ((!list_empty(&log->cqueue)) && | |
905 | ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || | |
906 | test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) | |
907 | /* | |
908 | * Call lmGCwrite with new group leader | |
909 | */ | |
910 | lmGCwrite(log, 1); | |
911 | ||
912 | /* no transaction are ready yet (transactions are only just | |
913 | * queued (GC_QUEUE) and not entered for group commit yet). | |
914 | * the first transaction entering group commit | |
915 | * will elect herself as new group leader. | |
916 | */ | |
917 | else | |
918 | log->cflag &= ~logGC_PAGEOUT; | |
919 | ||
920 | //LOGGC_UNLOCK(log); | |
921 | spin_unlock_irqrestore(&log->gclock, flags); | |
922 | return; | |
923 | } | |
924 | ||
925 | /* | |
926 | * NAME: lmLogSync() | |
927 | * | |
928 | * FUNCTION: write log SYNCPT record for specified log | |
929 | * if new sync address is available | |
930 | * (normally the case if sync() is executed by back-ground | |
931 | * process). | |
1da177e4 LT |
932 | * calculate new value of i_nextsync which determines when |
933 | * this code is called again. | |
934 | * | |
1c627829 | 935 | * PARAMETERS: log - log structure |
63f83c9f | 936 | * hard_sync - 1 to force all metadata to be written |
1da177e4 LT |
937 | * |
938 | * RETURN: 0 | |
63f83c9f | 939 | * |
1da177e4 LT |
940 | * serialization: LOG_LOCK() held on entry/exit |
941 | */ | |
cbc3d65e | 942 | static int lmLogSync(struct jfs_log * log, int hard_sync) |
1da177e4 LT |
943 | { |
944 | int logsize; | |
945 | int written; /* written since last syncpt */ | |
946 | int free; /* free space left available */ | |
947 | int delta; /* additional delta to write normally */ | |
948 | int more; /* additional write granted */ | |
949 | struct lrd lrd; | |
950 | int lsn; | |
951 | struct logsyncblk *lp; | |
7fab479b DK |
952 | unsigned long flags; |
953 | ||
954 | /* push dirty metapages out to disk */ | |
cbc3d65e | 955 | if (hard_sync) |
67e6682f | 956 | write_special_inodes(log, filemap_fdatawrite); |
cbc3d65e | 957 | else |
67e6682f | 958 | write_special_inodes(log, filemap_flush); |
1da177e4 LT |
959 | |
960 | /* | |
f720e3ba | 961 | * forward syncpt |
1da177e4 LT |
962 | */ |
963 | /* if last sync is same as last syncpt, | |
964 | * invoke sync point forward processing to update sync. | |
965 | */ | |
966 | ||
967 | if (log->sync == log->syncpt) { | |
7fab479b | 968 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
969 | if (list_empty(&log->synclist)) |
970 | log->sync = log->lsn; | |
971 | else { | |
972 | lp = list_entry(log->synclist.next, | |
973 | struct logsyncblk, synclist); | |
974 | log->sync = lp->lsn; | |
975 | } | |
7fab479b | 976 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
977 | |
978 | } | |
979 | ||
980 | /* if sync is different from last syncpt, | |
981 | * write a SYNCPT record with syncpt = sync. | |
982 | * reset syncpt = sync | |
983 | */ | |
984 | if (log->sync != log->syncpt) { | |
1da177e4 LT |
985 | lrd.logtid = 0; |
986 | lrd.backchain = 0; | |
987 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
988 | lrd.length = 0; | |
989 | lrd.log.syncpt.sync = cpu_to_le32(log->sync); | |
990 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
991 | ||
992 | log->syncpt = log->sync; | |
993 | } else | |
994 | lsn = log->lsn; | |
995 | ||
996 | /* | |
f720e3ba | 997 | * setup next syncpt trigger (SWAG) |
1da177e4 LT |
998 | */ |
999 | logsize = log->logsize; | |
1000 | ||
1001 | logdiff(written, lsn, log); | |
1002 | free = logsize - written; | |
1003 | delta = LOGSYNC_DELTA(logsize); | |
1004 | more = min(free / 2, delta); | |
1005 | if (more < 2 * LOGPSIZE) { | |
1006 | jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); | |
1007 | /* | |
f720e3ba | 1008 | * log wrapping |
1da177e4 LT |
1009 | * |
1010 | * option 1 - panic ? No.! | |
1011 | * option 2 - shutdown file systems | |
f720e3ba | 1012 | * associated with log ? |
1da177e4 | 1013 | * option 3 - extend log ? |
1da177e4 LT |
1014 | * option 4 - second chance |
1015 | * | |
1016 | * mark log wrapped, and continue. | |
1017 | * when all active transactions are completed, | |
817f2c84 | 1018 | * mark log valid for recovery. |
1da177e4 | 1019 | * if crashed during invalid state, log state |
817f2c84 | 1020 | * implies invalid log, forcing fsck(). |
1da177e4 LT |
1021 | */ |
1022 | /* mark log state log wrap in log superblock */ | |
1023 | /* log->state = LOGWRAP; */ | |
1024 | ||
1025 | /* reset sync point computation */ | |
1026 | log->syncpt = log->sync = lsn; | |
1027 | log->nextsync = delta; | |
1028 | } else | |
1029 | /* next syncpt trigger = written + more */ | |
1030 | log->nextsync = written + more; | |
1031 | ||
1da177e4 LT |
1032 | /* if number of bytes written from last sync point is more |
1033 | * than 1/4 of the log size, stop new transactions from | |
1034 | * starting until all current transactions are completed | |
1035 | * by setting syncbarrier flag. | |
1036 | */ | |
c2783f3a DK |
1037 | if (!test_bit(log_SYNCBARRIER, &log->flag) && |
1038 | (written > LOGSYNC_BARRIER(logsize)) && log->active) { | |
1da177e4 LT |
1039 | set_bit(log_SYNCBARRIER, &log->flag); |
1040 | jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, | |
1041 | log->syncpt); | |
1042 | /* | |
1043 | * We may have to initiate group commit | |
1044 | */ | |
1045 | jfs_flush_journal(log, 0); | |
1046 | } | |
1047 | ||
1048 | return lsn; | |
1049 | } | |
1050 | ||
1c627829 DK |
1051 | /* |
1052 | * NAME: jfs_syncpt | |
1053 | * | |
1054 | * FUNCTION: write log SYNCPT record for specified log | |
1055 | * | |
cbc3d65e | 1056 | * PARAMETERS: log - log structure |
63f83c9f | 1057 | * hard_sync - set to 1 to force metadata to be written |
1c627829 | 1058 | */ |
cbc3d65e | 1059 | void jfs_syncpt(struct jfs_log *log, int hard_sync) |
1c627829 | 1060 | { LOG_LOCK(log); |
cbc3d65e | 1061 | lmLogSync(log, hard_sync); |
1c627829 DK |
1062 | LOG_UNLOCK(log); |
1063 | } | |
1da177e4 LT |
1064 | |
1065 | /* | |
1066 | * NAME: lmLogOpen() | |
1067 | * | |
f720e3ba | 1068 | * FUNCTION: open the log on first open; |
1da177e4 LT |
1069 | * insert filesystem in the active list of the log. |
1070 | * | |
1071 | * PARAMETER: ipmnt - file system mount inode | |
63f83c9f | 1072 | * iplog - log inode (out) |
1da177e4 LT |
1073 | * |
1074 | * RETURN: | |
1075 | * | |
1076 | * serialization: | |
1077 | */ | |
1078 | int lmLogOpen(struct super_block *sb) | |
1079 | { | |
1080 | int rc; | |
1081 | struct block_device *bdev; | |
1082 | struct jfs_log *log; | |
1083 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1084 | ||
1085 | if (sbi->flag & JFS_NOINTEGRITY) | |
1086 | return open_dummy_log(sb); | |
63f83c9f | 1087 | |
1da177e4 LT |
1088 | if (sbi->mntflag & JFS_INLINELOG) |
1089 | return open_inline_log(sb); | |
1090 | ||
353ab6e9 | 1091 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1092 | list_for_each_entry(log, &jfs_external_logs, journal_list) { |
1093 | if (log->bdev->bd_dev == sbi->logdev) { | |
1094 | if (memcmp(log->uuid, sbi->loguuid, | |
1095 | sizeof(log->uuid))) { | |
1096 | jfs_warn("wrong uuid on JFS journal\n"); | |
353ab6e9 | 1097 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1098 | return -EINVAL; |
1099 | } | |
1100 | /* | |
1101 | * add file system to log active file system list | |
1102 | */ | |
1103 | if ((rc = lmLogFileSystem(log, sbi, 1))) { | |
353ab6e9 | 1104 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1105 | return rc; |
1106 | } | |
1107 | goto journal_found; | |
1108 | } | |
1109 | } | |
1110 | ||
5b3030e3 | 1111 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
353ab6e9 | 1112 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1113 | return -ENOMEM; |
1114 | } | |
1da177e4 LT |
1115 | INIT_LIST_HEAD(&log->sb_list); |
1116 | init_waitqueue_head(&log->syncwait); | |
1117 | ||
1118 | /* | |
f720e3ba | 1119 | * external log as separate logical volume |
1da177e4 LT |
1120 | * |
1121 | * file systems to log may have n-to-1 relationship; | |
1122 | */ | |
1123 | ||
d4d77629 TH |
1124 | bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
1125 | log); | |
1da177e4 | 1126 | if (IS_ERR(bdev)) { |
9054760f | 1127 | rc = PTR_ERR(bdev); |
1da177e4 LT |
1128 | goto free; |
1129 | } | |
1130 | ||
1da177e4 LT |
1131 | log->bdev = bdev; |
1132 | memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); | |
63f83c9f | 1133 | |
1da177e4 LT |
1134 | /* |
1135 | * initialize log: | |
1136 | */ | |
1137 | if ((rc = lmLogInit(log))) | |
e525fd89 | 1138 | goto close; |
1da177e4 LT |
1139 | |
1140 | list_add(&log->journal_list, &jfs_external_logs); | |
1141 | ||
1142 | /* | |
1143 | * add file system to log active file system list | |
1144 | */ | |
1145 | if ((rc = lmLogFileSystem(log, sbi, 1))) | |
1146 | goto shutdown; | |
1147 | ||
1148 | journal_found: | |
1149 | LOG_LOCK(log); | |
1150 | list_add(&sbi->log_list, &log->sb_list); | |
1151 | sbi->log = log; | |
1152 | LOG_UNLOCK(log); | |
1153 | ||
353ab6e9 | 1154 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1155 | return 0; |
1156 | ||
1157 | /* | |
f720e3ba | 1158 | * unwind on error |
1da177e4 LT |
1159 | */ |
1160 | shutdown: /* unwind lbmLogInit() */ | |
1161 | list_del(&log->journal_list); | |
1162 | lbmLogShutdown(log); | |
1163 | ||
1da177e4 | 1164 | close: /* close external log device */ |
e525fd89 | 1165 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1166 | |
1167 | free: /* free log descriptor */ | |
353ab6e9 | 1168 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1169 | kfree(log); |
1170 | ||
1171 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1172 | return rc; | |
1173 | } | |
1174 | ||
1175 | static int open_inline_log(struct super_block *sb) | |
1176 | { | |
1177 | struct jfs_log *log; | |
1178 | int rc; | |
1179 | ||
5b3030e3 | 1180 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
1da177e4 | 1181 | return -ENOMEM; |
1da177e4 LT |
1182 | INIT_LIST_HEAD(&log->sb_list); |
1183 | init_waitqueue_head(&log->syncwait); | |
1184 | ||
1185 | set_bit(log_INLINELOG, &log->flag); | |
1186 | log->bdev = sb->s_bdev; | |
1187 | log->base = addressPXD(&JFS_SBI(sb)->logpxd); | |
1188 | log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> | |
1189 | (L2LOGPSIZE - sb->s_blocksize_bits); | |
1190 | log->l2bsize = sb->s_blocksize_bits; | |
1191 | ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); | |
1192 | ||
1193 | /* | |
1194 | * initialize log. | |
1195 | */ | |
1196 | if ((rc = lmLogInit(log))) { | |
1197 | kfree(log); | |
1198 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1199 | return rc; | |
1200 | } | |
1201 | ||
1202 | list_add(&JFS_SBI(sb)->log_list, &log->sb_list); | |
1203 | JFS_SBI(sb)->log = log; | |
1204 | ||
1205 | return rc; | |
1206 | } | |
1207 | ||
1208 | static int open_dummy_log(struct super_block *sb) | |
1209 | { | |
1210 | int rc; | |
1211 | ||
353ab6e9 | 1212 | mutex_lock(&jfs_log_mutex); |
1da177e4 | 1213 | if (!dummy_log) { |
5b3030e3 | 1214 | dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
1da177e4 | 1215 | if (!dummy_log) { |
353ab6e9 | 1216 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1217 | return -ENOMEM; |
1218 | } | |
1da177e4 LT |
1219 | INIT_LIST_HEAD(&dummy_log->sb_list); |
1220 | init_waitqueue_head(&dummy_log->syncwait); | |
1221 | dummy_log->no_integrity = 1; | |
1222 | /* Make up some stuff */ | |
1223 | dummy_log->base = 0; | |
1224 | dummy_log->size = 1024; | |
1225 | rc = lmLogInit(dummy_log); | |
1226 | if (rc) { | |
1227 | kfree(dummy_log); | |
1228 | dummy_log = NULL; | |
353ab6e9 | 1229 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1230 | return rc; |
1231 | } | |
1232 | } | |
1233 | ||
1234 | LOG_LOCK(dummy_log); | |
1235 | list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); | |
1236 | JFS_SBI(sb)->log = dummy_log; | |
1237 | LOG_UNLOCK(dummy_log); | |
353ab6e9 | 1238 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1239 | |
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * NAME: lmLogInit() | |
1245 | * | |
1246 | * FUNCTION: log initialization at first log open. | |
1247 | * | |
1248 | * logredo() (or logformat()) should have been run previously. | |
1249 | * initialize the log from log superblock. | |
1250 | * set the log state in the superblock to LOGMOUNT and | |
1251 | * write SYNCPT log record. | |
63f83c9f | 1252 | * |
1da177e4 LT |
1253 | * PARAMETER: log - log structure |
1254 | * | |
1255 | * RETURN: 0 - if ok | |
1256 | * -EINVAL - bad log magic number or superblock dirty | |
1257 | * error returned from logwait() | |
63f83c9f | 1258 | * |
1da177e4 LT |
1259 | * serialization: single first open thread |
1260 | */ | |
1261 | int lmLogInit(struct jfs_log * log) | |
1262 | { | |
1263 | int rc = 0; | |
1264 | struct lrd lrd; | |
1265 | struct logsuper *logsuper; | |
1266 | struct lbuf *bpsuper; | |
1267 | struct lbuf *bp; | |
1268 | struct logpage *lp; | |
1269 | int lsn = 0; | |
1270 | ||
1271 | jfs_info("lmLogInit: log:0x%p", log); | |
1272 | ||
1273 | /* initialize the group commit serialization lock */ | |
1274 | LOGGC_LOCK_INIT(log); | |
1275 | ||
1276 | /* allocate/initialize the log write serialization lock */ | |
1277 | LOG_LOCK_INIT(log); | |
1278 | ||
1279 | LOGSYNC_LOCK_INIT(log); | |
1280 | ||
1281 | INIT_LIST_HEAD(&log->synclist); | |
1282 | ||
1283 | INIT_LIST_HEAD(&log->cqueue); | |
1284 | log->flush_tblk = NULL; | |
1285 | ||
1286 | log->count = 0; | |
1287 | ||
1288 | /* | |
1289 | * initialize log i/o | |
1290 | */ | |
1291 | if ((rc = lbmLogInit(log))) | |
1292 | return rc; | |
1293 | ||
1294 | if (!test_bit(log_INLINELOG, &log->flag)) | |
1295 | log->l2bsize = L2LOGPSIZE; | |
63f83c9f | 1296 | |
1da177e4 LT |
1297 | /* check for disabled journaling to disk */ |
1298 | if (log->no_integrity) { | |
1299 | /* | |
1300 | * Journal pages will still be filled. When the time comes | |
1301 | * to actually do the I/O, the write is not done, and the | |
1302 | * endio routine is called directly. | |
1303 | */ | |
1304 | bp = lbmAllocate(log , 0); | |
1305 | log->bp = bp; | |
1306 | bp->l_pn = bp->l_eor = 0; | |
1307 | } else { | |
1308 | /* | |
1309 | * validate log superblock | |
1310 | */ | |
1311 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1312 | goto errout10; | |
1313 | ||
1314 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1315 | ||
1316 | if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { | |
1317 | jfs_warn("*** Log Format Error ! ***"); | |
1318 | rc = -EINVAL; | |
1319 | goto errout20; | |
1320 | } | |
1321 | ||
1322 | /* logredo() should have been run successfully. */ | |
1323 | if (logsuper->state != cpu_to_le32(LOGREDONE)) { | |
1324 | jfs_warn("*** Log Is Dirty ! ***"); | |
1325 | rc = -EINVAL; | |
1326 | goto errout20; | |
1327 | } | |
1328 | ||
1329 | /* initialize log from log superblock */ | |
1330 | if (test_bit(log_INLINELOG,&log->flag)) { | |
1331 | if (log->size != le32_to_cpu(logsuper->size)) { | |
1332 | rc = -EINVAL; | |
1333 | goto errout20; | |
1334 | } | |
1335 | jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " | |
1336 | "size:0x%x", log, | |
1337 | (unsigned long long) log->base, log->size); | |
1338 | } else { | |
1339 | if (memcmp(logsuper->uuid, log->uuid, 16)) { | |
1340 | jfs_warn("wrong uuid on JFS log device"); | |
1341 | goto errout20; | |
1342 | } | |
1343 | log->size = le32_to_cpu(logsuper->size); | |
1344 | log->l2bsize = le32_to_cpu(logsuper->l2bsize); | |
1345 | jfs_info("lmLogInit: external log:0x%p base:0x%Lx " | |
1346 | "size:0x%x", log, | |
1347 | (unsigned long long) log->base, log->size); | |
1348 | } | |
1349 | ||
1350 | log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; | |
1351 | log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); | |
1352 | ||
1353 | /* | |
1354 | * initialize for log append write mode | |
1355 | */ | |
1356 | /* establish current/end-of-log page/buffer */ | |
1357 | if ((rc = lbmRead(log, log->page, &bp))) | |
1358 | goto errout20; | |
1359 | ||
1360 | lp = (struct logpage *) bp->l_ldata; | |
1361 | ||
1362 | jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", | |
1363 | le32_to_cpu(logsuper->end), log->page, log->eor, | |
1364 | le16_to_cpu(lp->h.eor)); | |
1365 | ||
1366 | log->bp = bp; | |
1367 | bp->l_pn = log->page; | |
1368 | bp->l_eor = log->eor; | |
1369 | ||
1370 | /* if current page is full, move on to next page */ | |
1371 | if (log->eor >= LOGPSIZE - LOGPTLRSIZE) | |
1372 | lmNextPage(log); | |
1373 | ||
1374 | /* | |
1375 | * initialize log syncpoint | |
1376 | */ | |
1377 | /* | |
1378 | * write the first SYNCPT record with syncpoint = 0 | |
1379 | * (i.e., log redo up to HERE !); | |
1380 | * remove current page from lbm write queue at end of pageout | |
1381 | * (to write log superblock update), but do not release to | |
1382 | * freelist; | |
1383 | */ | |
1384 | lrd.logtid = 0; | |
1385 | lrd.backchain = 0; | |
1386 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1387 | lrd.length = 0; | |
1388 | lrd.log.syncpt.sync = 0; | |
1389 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1390 | bp = log->bp; | |
1391 | bp->l_ceor = bp->l_eor; | |
1392 | lp = (struct logpage *) bp->l_ldata; | |
1393 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1394 | lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); | |
1395 | if ((rc = lbmIOWait(bp, 0))) | |
1396 | goto errout30; | |
1397 | ||
1398 | /* | |
1399 | * update/write superblock | |
1400 | */ | |
1401 | logsuper->state = cpu_to_le32(LOGMOUNT); | |
1402 | log->serial = le32_to_cpu(logsuper->serial) + 1; | |
1403 | logsuper->serial = cpu_to_le32(log->serial); | |
1404 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1405 | if ((rc = lbmIOWait(bpsuper, lbmFREE))) | |
1406 | goto errout30; | |
1407 | } | |
1408 | ||
1409 | /* initialize logsync parameters */ | |
1410 | log->logsize = (log->size - 2) << L2LOGPSIZE; | |
1411 | log->lsn = lsn; | |
1412 | log->syncpt = lsn; | |
1413 | log->sync = log->syncpt; | |
1414 | log->nextsync = LOGSYNC_DELTA(log->logsize); | |
1415 | ||
1416 | jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", | |
1417 | log->lsn, log->syncpt, log->sync); | |
1418 | ||
1419 | /* | |
1420 | * initialize for lazy/group commit | |
1421 | */ | |
1422 | log->clsn = lsn; | |
1423 | ||
1424 | return 0; | |
1425 | ||
1426 | /* | |
f720e3ba | 1427 | * unwind on error |
1da177e4 LT |
1428 | */ |
1429 | errout30: /* release log page */ | |
1430 | log->wqueue = NULL; | |
1431 | bp->l_wqnext = NULL; | |
1432 | lbmFree(bp); | |
1433 | ||
1434 | errout20: /* release log superblock */ | |
1435 | lbmFree(bpsuper); | |
1436 | ||
1437 | errout10: /* unwind lbmLogInit() */ | |
1438 | lbmLogShutdown(log); | |
1439 | ||
1440 | jfs_warn("lmLogInit: exit(%d)", rc); | |
1441 | return rc; | |
1442 | } | |
1443 | ||
1444 | ||
1445 | /* | |
1446 | * NAME: lmLogClose() | |
1447 | * | |
1448 | * FUNCTION: remove file system <ipmnt> from active list of log <iplog> | |
1449 | * and close it on last close. | |
1450 | * | |
1451 | * PARAMETER: sb - superblock | |
1452 | * | |
1453 | * RETURN: errors from subroutines | |
1454 | * | |
1455 | * serialization: | |
1456 | */ | |
1457 | int lmLogClose(struct super_block *sb) | |
1458 | { | |
1459 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1460 | struct jfs_log *log = sbi->log; | |
1461 | struct block_device *bdev; | |
1462 | int rc = 0; | |
1463 | ||
1464 | jfs_info("lmLogClose: log:0x%p", log); | |
1465 | ||
353ab6e9 | 1466 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1467 | LOG_LOCK(log); |
1468 | list_del(&sbi->log_list); | |
1469 | LOG_UNLOCK(log); | |
1470 | sbi->log = NULL; | |
1471 | ||
1472 | /* | |
1473 | * We need to make sure all of the "written" metapages | |
1474 | * actually make it to disk | |
1475 | */ | |
1476 | sync_blockdev(sb->s_bdev); | |
1477 | ||
1478 | if (test_bit(log_INLINELOG, &log->flag)) { | |
1479 | /* | |
f720e3ba | 1480 | * in-line log in host file system |
1da177e4 LT |
1481 | */ |
1482 | rc = lmLogShutdown(log); | |
1483 | kfree(log); | |
1484 | goto out; | |
1485 | } | |
1486 | ||
1487 | if (!log->no_integrity) | |
1488 | lmLogFileSystem(log, sbi, 0); | |
1489 | ||
1490 | if (!list_empty(&log->sb_list)) | |
1491 | goto out; | |
1492 | ||
1493 | /* | |
1494 | * TODO: ensure that the dummy_log is in a state to allow | |
1495 | * lbmLogShutdown to deallocate all the buffers and call | |
1496 | * kfree against dummy_log. For now, leave dummy_log & its | |
1497 | * buffers in memory, and resuse if another no-integrity mount | |
1498 | * is requested. | |
1499 | */ | |
1500 | if (log->no_integrity) | |
1501 | goto out; | |
1502 | ||
1503 | /* | |
f720e3ba | 1504 | * external log as separate logical volume |
1da177e4 LT |
1505 | */ |
1506 | list_del(&log->journal_list); | |
1507 | bdev = log->bdev; | |
1508 | rc = lmLogShutdown(log); | |
1509 | ||
e525fd89 | 1510 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1511 | |
1512 | kfree(log); | |
1513 | ||
1514 | out: | |
353ab6e9 | 1515 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1516 | jfs_info("lmLogClose: exit(%d)", rc); |
1517 | return rc; | |
1518 | } | |
1519 | ||
1520 | ||
1521 | /* | |
1522 | * NAME: jfs_flush_journal() | |
1523 | * | |
1524 | * FUNCTION: initiate write of any outstanding transactions to the journal | |
1525 | * and optionally wait until they are all written to disk | |
1526 | * | |
1527 | * wait == 0 flush until latest txn is committed, don't wait | |
1528 | * wait == 1 flush until latest txn is committed, wait | |
1529 | * wait > 1 flush until all txn's are complete, wait | |
1530 | */ | |
1531 | void jfs_flush_journal(struct jfs_log *log, int wait) | |
1532 | { | |
1533 | int i; | |
1534 | struct tblock *target = NULL; | |
1535 | ||
1536 | /* jfs_write_inode may call us during read-only mount */ | |
1537 | if (!log) | |
1538 | return; | |
1539 | ||
1540 | jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); | |
1541 | ||
1542 | LOGGC_LOCK(log); | |
1543 | ||
1544 | if (!list_empty(&log->cqueue)) { | |
1545 | /* | |
1546 | * This ensures that we will keep writing to the journal as long | |
1547 | * as there are unwritten commit records | |
1548 | */ | |
1549 | target = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
1550 | ||
1551 | if (test_bit(log_FLUSH, &log->flag)) { | |
1552 | /* | |
1553 | * We're already flushing. | |
1554 | * if flush_tblk is NULL, we are flushing everything, | |
1555 | * so leave it that way. Otherwise, update it to the | |
1556 | * latest transaction | |
1557 | */ | |
1558 | if (log->flush_tblk) | |
1559 | log->flush_tblk = target; | |
1560 | } else { | |
1561 | /* Only flush until latest transaction is committed */ | |
1562 | log->flush_tblk = target; | |
1563 | set_bit(log_FLUSH, &log->flag); | |
1564 | ||
1565 | /* | |
1566 | * Initiate I/O on outstanding transactions | |
1567 | */ | |
1568 | if (!(log->cflag & logGC_PAGEOUT)) { | |
1569 | log->cflag |= logGC_PAGEOUT; | |
1570 | lmGCwrite(log, 0); | |
1571 | } | |
1572 | } | |
1573 | } | |
1574 | if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { | |
1575 | /* Flush until all activity complete */ | |
1576 | set_bit(log_FLUSH, &log->flag); | |
1577 | log->flush_tblk = NULL; | |
1578 | } | |
1579 | ||
1580 | if (wait && target && !(target->flag & tblkGC_COMMITTED)) { | |
1581 | DECLARE_WAITQUEUE(__wait, current); | |
1582 | ||
1583 | add_wait_queue(&target->gcwait, &__wait); | |
1584 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1585 | LOGGC_UNLOCK(log); | |
1586 | schedule(); | |
3cbb1c8e | 1587 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1588 | LOGGC_LOCK(log); |
1589 | remove_wait_queue(&target->gcwait, &__wait); | |
1590 | } | |
1591 | LOGGC_UNLOCK(log); | |
1592 | ||
1593 | if (wait < 2) | |
1594 | return; | |
1595 | ||
67e6682f | 1596 | write_special_inodes(log, filemap_fdatawrite); |
7fab479b | 1597 | |
1da177e4 LT |
1598 | /* |
1599 | * If there was recent activity, we may need to wait | |
1600 | * for the lazycommit thread to catch up | |
1601 | */ | |
1602 | if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { | |
7fab479b | 1603 | for (i = 0; i < 200; i++) { /* Too much? */ |
1da177e4 | 1604 | msleep(250); |
67e6682f | 1605 | write_special_inodes(log, filemap_fdatawrite); |
1da177e4 LT |
1606 | if (list_empty(&log->cqueue) && |
1607 | list_empty(&log->synclist)) | |
1608 | break; | |
1609 | } | |
1610 | } | |
1611 | assert(list_empty(&log->cqueue)); | |
72e3148a DK |
1612 | |
1613 | #ifdef CONFIG_JFS_DEBUG | |
7fab479b DK |
1614 | if (!list_empty(&log->synclist)) { |
1615 | struct logsyncblk *lp; | |
1616 | ||
209e101b | 1617 | printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
7fab479b DK |
1618 | list_for_each_entry(lp, &log->synclist, synclist) { |
1619 | if (lp->xflag & COMMIT_PAGE) { | |
1620 | struct metapage *mp = (struct metapage *)lp; | |
288e4d83 DK |
1621 | print_hex_dump(KERN_ERR, "metapage: ", |
1622 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1623 | mp, sizeof(struct metapage), 0); | |
1624 | print_hex_dump(KERN_ERR, "page: ", | |
1625 | DUMP_PREFIX_ADDRESS, 16, | |
1626 | sizeof(long), mp->page, | |
1627 | sizeof(struct page), 0); | |
1628 | } else | |
1629 | print_hex_dump(KERN_ERR, "tblock:", | |
1630 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1631 | lp, sizeof(struct tblock), 0); | |
7fab479b | 1632 | } |
7fab479b | 1633 | } |
288e4d83 DK |
1634 | #else |
1635 | WARN_ON(!list_empty(&log->synclist)); | |
72e3148a | 1636 | #endif |
1da177e4 LT |
1637 | clear_bit(log_FLUSH, &log->flag); |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * NAME: lmLogShutdown() | |
1642 | * | |
1643 | * FUNCTION: log shutdown at last LogClose(). | |
1644 | * | |
1645 | * write log syncpt record. | |
1646 | * update super block to set redone flag to 0. | |
1647 | * | |
1648 | * PARAMETER: log - log inode | |
1649 | * | |
1650 | * RETURN: 0 - success | |
63f83c9f | 1651 | * |
1da177e4 LT |
1652 | * serialization: single last close thread |
1653 | */ | |
1654 | int lmLogShutdown(struct jfs_log * log) | |
1655 | { | |
1656 | int rc; | |
1657 | struct lrd lrd; | |
1658 | int lsn; | |
1659 | struct logsuper *logsuper; | |
1660 | struct lbuf *bpsuper; | |
1661 | struct lbuf *bp; | |
1662 | struct logpage *lp; | |
1663 | ||
1664 | jfs_info("lmLogShutdown: log:0x%p", log); | |
1665 | ||
1666 | jfs_flush_journal(log, 2); | |
1667 | ||
1668 | /* | |
1669 | * write the last SYNCPT record with syncpoint = 0 | |
1670 | * (i.e., log redo up to HERE !) | |
1671 | */ | |
1672 | lrd.logtid = 0; | |
1673 | lrd.backchain = 0; | |
1674 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1675 | lrd.length = 0; | |
1676 | lrd.log.syncpt.sync = 0; | |
63f83c9f | 1677 | |
1da177e4 LT |
1678 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
1679 | bp = log->bp; | |
1680 | lp = (struct logpage *) bp->l_ldata; | |
1681 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1682 | lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); | |
1683 | lbmIOWait(log->bp, lbmFREE); | |
dc5798d9 | 1684 | log->bp = NULL; |
1da177e4 LT |
1685 | |
1686 | /* | |
1687 | * synchronous update log superblock | |
1688 | * mark log state as shutdown cleanly | |
1689 | * (i.e., Log does not need to be replayed). | |
1690 | */ | |
1691 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1692 | goto out; | |
1693 | ||
1694 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1695 | logsuper->state = cpu_to_le32(LOGREDONE); | |
1696 | logsuper->end = cpu_to_le32(lsn); | |
1697 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1698 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1699 | ||
1700 | jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", | |
1701 | lsn, log->page, log->eor); | |
1702 | ||
63f83c9f | 1703 | out: |
1da177e4 LT |
1704 | /* |
1705 | * shutdown per log i/o | |
1706 | */ | |
1707 | lbmLogShutdown(log); | |
1708 | ||
1709 | if (rc) { | |
1710 | jfs_warn("lmLogShutdown: exit(%d)", rc); | |
1711 | } | |
1712 | return rc; | |
1713 | } | |
1714 | ||
1715 | ||
1716 | /* | |
1717 | * NAME: lmLogFileSystem() | |
1718 | * | |
1719 | * FUNCTION: insert (<activate> = true)/remove (<activate> = false) | |
1720 | * file system into/from log active file system list. | |
1721 | * | |
1722 | * PARAMETE: log - pointer to logs inode. | |
1723 | * fsdev - kdev_t of filesystem. | |
f720e3ba | 1724 | * serial - pointer to returned log serial number |
1da177e4 LT |
1725 | * activate - insert/remove device from active list. |
1726 | * | |
1727 | * RETURN: 0 - success | |
1728 | * errors returned by vms_iowait(). | |
1729 | */ | |
1730 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
1731 | int activate) | |
1732 | { | |
1733 | int rc = 0; | |
1734 | int i; | |
1735 | struct logsuper *logsuper; | |
1736 | struct lbuf *bpsuper; | |
1737 | char *uuid = sbi->uuid; | |
1738 | ||
1739 | /* | |
1740 | * insert/remove file system device to log active file system list. | |
1741 | */ | |
1742 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1743 | return rc; | |
1744 | ||
1745 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1746 | if (activate) { | |
1747 | for (i = 0; i < MAX_ACTIVE; i++) | |
1748 | if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { | |
1749 | memcpy(logsuper->active[i].uuid, uuid, 16); | |
1750 | sbi->aggregate = i; | |
1751 | break; | |
1752 | } | |
1753 | if (i == MAX_ACTIVE) { | |
1754 | jfs_warn("Too many file systems sharing journal!"); | |
1755 | lbmFree(bpsuper); | |
1756 | return -EMFILE; /* Is there a better rc? */ | |
1757 | } | |
1758 | } else { | |
1759 | for (i = 0; i < MAX_ACTIVE; i++) | |
1760 | if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { | |
1761 | memcpy(logsuper->active[i].uuid, NULL_UUID, 16); | |
1762 | break; | |
1763 | } | |
1764 | if (i == MAX_ACTIVE) { | |
1765 | jfs_warn("Somebody stomped on the journal!"); | |
1766 | lbmFree(bpsuper); | |
1767 | return -EIO; | |
1768 | } | |
63f83c9f | 1769 | |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | /* | |
1773 | * synchronous write log superblock: | |
1774 | * | |
1775 | * write sidestream bypassing write queue: | |
1776 | * at file system mount, log super block is updated for | |
1777 | * activation of the file system before any log record | |
1778 | * (MOUNT record) of the file system, and at file system | |
1779 | * unmount, all meta data for the file system has been | |
1780 | * flushed before log super block is updated for deactivation | |
1781 | * of the file system. | |
1782 | */ | |
1783 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1784 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1785 | ||
1786 | return rc; | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * log buffer manager (lbm) | |
1791 | * ------------------------ | |
1792 | * | |
1793 | * special purpose buffer manager supporting log i/o requirements. | |
1794 | * | |
1795 | * per log write queue: | |
1796 | * log pageout occurs in serial order by fifo write queue and | |
1797 | * restricting to a single i/o in pregress at any one time. | |
1798 | * a circular singly-linked list | |
1799 | * (log->wrqueue points to the tail, and buffers are linked via | |
1800 | * bp->wrqueue field), and | |
1801 | * maintains log page in pageout ot waiting for pageout in serial pageout. | |
1802 | */ | |
1803 | ||
1804 | /* | |
1805 | * lbmLogInit() | |
1806 | * | |
1807 | * initialize per log I/O setup at lmLogInit() | |
1808 | */ | |
1809 | static int lbmLogInit(struct jfs_log * log) | |
1810 | { /* log inode */ | |
1811 | int i; | |
1812 | struct lbuf *lbuf; | |
1813 | ||
1814 | jfs_info("lbmLogInit: log:0x%p", log); | |
1815 | ||
1816 | /* initialize current buffer cursor */ | |
1817 | log->bp = NULL; | |
1818 | ||
1819 | /* initialize log device write queue */ | |
1820 | log->wqueue = NULL; | |
1821 | ||
1822 | /* | |
1823 | * Each log has its own buffer pages allocated to it. These are | |
1824 | * not managed by the page cache. This ensures that a transaction | |
1825 | * writing to the log does not block trying to allocate a page from | |
1826 | * the page cache (for the log). This would be bad, since page | |
1827 | * allocation waits on the kswapd thread that may be committing inodes | |
1828 | * which would cause log activity. Was that clear? I'm trying to | |
1829 | * avoid deadlock here. | |
1830 | */ | |
1831 | init_waitqueue_head(&log->free_wait); | |
1832 | ||
1833 | log->lbuf_free = NULL; | |
1834 | ||
dc5798d9 DK |
1835 | for (i = 0; i < LOGPAGES;) { |
1836 | char *buffer; | |
1837 | uint offset; | |
1838 | struct page *page; | |
1839 | ||
1840 | buffer = (char *) get_zeroed_page(GFP_KERNEL); | |
1841 | if (buffer == NULL) | |
1da177e4 | 1842 | goto error; |
dc5798d9 DK |
1843 | page = virt_to_page(buffer); |
1844 | for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { | |
1845 | lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); | |
1846 | if (lbuf == NULL) { | |
1847 | if (offset == 0) | |
1848 | free_page((unsigned long) buffer); | |
1849 | goto error; | |
1850 | } | |
1851 | if (offset) /* we already have one reference */ | |
1852 | get_page(page); | |
1853 | lbuf->l_offset = offset; | |
1854 | lbuf->l_ldata = buffer + offset; | |
1855 | lbuf->l_page = page; | |
1856 | lbuf->l_log = log; | |
1857 | init_waitqueue_head(&lbuf->l_ioevent); | |
1858 | ||
1859 | lbuf->l_freelist = log->lbuf_free; | |
1860 | log->lbuf_free = lbuf; | |
1861 | i++; | |
1da177e4 | 1862 | } |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | return (0); | |
1866 | ||
1867 | error: | |
1868 | lbmLogShutdown(log); | |
1869 | return -ENOMEM; | |
1870 | } | |
1871 | ||
1872 | ||
1873 | /* | |
1874 | * lbmLogShutdown() | |
1875 | * | |
1876 | * finalize per log I/O setup at lmLogShutdown() | |
1877 | */ | |
1878 | static void lbmLogShutdown(struct jfs_log * log) | |
1879 | { | |
1880 | struct lbuf *lbuf; | |
1881 | ||
1882 | jfs_info("lbmLogShutdown: log:0x%p", log); | |
1883 | ||
1884 | lbuf = log->lbuf_free; | |
1885 | while (lbuf) { | |
1886 | struct lbuf *next = lbuf->l_freelist; | |
dc5798d9 | 1887 | __free_page(lbuf->l_page); |
1da177e4 LT |
1888 | kfree(lbuf); |
1889 | lbuf = next; | |
1890 | } | |
1da177e4 LT |
1891 | } |
1892 | ||
1893 | ||
1894 | /* | |
1895 | * lbmAllocate() | |
1896 | * | |
1897 | * allocate an empty log buffer | |
1898 | */ | |
1899 | static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) | |
1900 | { | |
1901 | struct lbuf *bp; | |
1902 | unsigned long flags; | |
1903 | ||
1904 | /* | |
1905 | * recycle from log buffer freelist if any | |
1906 | */ | |
1907 | LCACHE_LOCK(flags); | |
1908 | LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); | |
1909 | log->lbuf_free = bp->l_freelist; | |
1910 | LCACHE_UNLOCK(flags); | |
1911 | ||
1912 | bp->l_flag = 0; | |
1913 | ||
1914 | bp->l_wqnext = NULL; | |
1915 | bp->l_freelist = NULL; | |
1916 | ||
1917 | bp->l_pn = pn; | |
1918 | bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); | |
1919 | bp->l_ceor = 0; | |
1920 | ||
1921 | return bp; | |
1922 | } | |
1923 | ||
1924 | ||
1925 | /* | |
1926 | * lbmFree() | |
1927 | * | |
1928 | * release a log buffer to freelist | |
1929 | */ | |
1930 | static void lbmFree(struct lbuf * bp) | |
1931 | { | |
1932 | unsigned long flags; | |
1933 | ||
1934 | LCACHE_LOCK(flags); | |
1935 | ||
1936 | lbmfree(bp); | |
1937 | ||
1938 | LCACHE_UNLOCK(flags); | |
1939 | } | |
1940 | ||
1941 | static void lbmfree(struct lbuf * bp) | |
1942 | { | |
1943 | struct jfs_log *log = bp->l_log; | |
1944 | ||
1945 | assert(bp->l_wqnext == NULL); | |
1946 | ||
1947 | /* | |
1948 | * return the buffer to head of freelist | |
1949 | */ | |
1950 | bp->l_freelist = log->lbuf_free; | |
1951 | log->lbuf_free = bp; | |
1952 | ||
1953 | wake_up(&log->free_wait); | |
1954 | return; | |
1955 | } | |
1956 | ||
1957 | ||
1958 | /* | |
1959 | * NAME: lbmRedrive | |
1960 | * | |
59c51591 | 1961 | * FUNCTION: add a log buffer to the log redrive list |
1da177e4 LT |
1962 | * |
1963 | * PARAMETER: | |
f720e3ba | 1964 | * bp - log buffer |
1da177e4 LT |
1965 | * |
1966 | * NOTES: | |
1967 | * Takes log_redrive_lock. | |
1968 | */ | |
1969 | static inline void lbmRedrive(struct lbuf *bp) | |
1970 | { | |
1971 | unsigned long flags; | |
1972 | ||
1973 | spin_lock_irqsave(&log_redrive_lock, flags); | |
1974 | bp->l_redrive_next = log_redrive_list; | |
1975 | log_redrive_list = bp; | |
1976 | spin_unlock_irqrestore(&log_redrive_lock, flags); | |
1977 | ||
91dbb4de | 1978 | wake_up_process(jfsIOthread); |
1da177e4 LT |
1979 | } |
1980 | ||
1981 | ||
1982 | /* | |
1983 | * lbmRead() | |
1984 | */ | |
1985 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) | |
1986 | { | |
1987 | struct bio *bio; | |
1988 | struct lbuf *bp; | |
1989 | ||
1990 | /* | |
1991 | * allocate a log buffer | |
1992 | */ | |
1993 | *bpp = bp = lbmAllocate(log, pn); | |
1994 | jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); | |
1995 | ||
1996 | bp->l_flag |= lbmREAD; | |
1997 | ||
1998 | bio = bio_alloc(GFP_NOFS, 1); | |
1999 | ||
2000 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
2001 | bio->bi_bdev = log->bdev; | |
dc5798d9 | 2002 | bio->bi_io_vec[0].bv_page = bp->l_page; |
1da177e4 | 2003 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
dc5798d9 | 2004 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
1da177e4 LT |
2005 | |
2006 | bio->bi_vcnt = 1; | |
2007 | bio->bi_idx = 0; | |
2008 | bio->bi_size = LOGPSIZE; | |
2009 | ||
2010 | bio->bi_end_io = lbmIODone; | |
2011 | bio->bi_private = bp; | |
2012 | submit_bio(READ_SYNC, bio); | |
2013 | ||
2014 | wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); | |
2015 | ||
2016 | return 0; | |
2017 | } | |
2018 | ||
2019 | ||
2020 | /* | |
2021 | * lbmWrite() | |
2022 | * | |
2023 | * buffer at head of pageout queue stays after completion of | |
2024 | * partial-page pageout and redriven by explicit initiation of | |
2025 | * pageout by caller until full-page pageout is completed and | |
2026 | * released. | |
2027 | * | |
2028 | * device driver i/o done redrives pageout of new buffer at | |
2029 | * head of pageout queue when current buffer at head of pageout | |
2030 | * queue is released at the completion of its full-page pageout. | |
2031 | * | |
2032 | * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). | |
2033 | * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() | |
2034 | */ | |
2035 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, | |
2036 | int cant_block) | |
2037 | { | |
2038 | struct lbuf *tail; | |
2039 | unsigned long flags; | |
2040 | ||
2041 | jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); | |
2042 | ||
2043 | /* map the logical block address to physical block address */ | |
2044 | bp->l_blkno = | |
2045 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2046 | ||
2047 | LCACHE_LOCK(flags); /* disable+lock */ | |
2048 | ||
2049 | /* | |
2050 | * initialize buffer for device driver | |
2051 | */ | |
2052 | bp->l_flag = flag; | |
2053 | ||
2054 | /* | |
f720e3ba | 2055 | * insert bp at tail of write queue associated with log |
1da177e4 LT |
2056 | * |
2057 | * (request is either for bp already/currently at head of queue | |
2058 | * or new bp to be inserted at tail) | |
2059 | */ | |
2060 | tail = log->wqueue; | |
2061 | ||
2062 | /* is buffer not already on write queue ? */ | |
2063 | if (bp->l_wqnext == NULL) { | |
2064 | /* insert at tail of wqueue */ | |
2065 | if (tail == NULL) { | |
2066 | log->wqueue = bp; | |
2067 | bp->l_wqnext = bp; | |
2068 | } else { | |
2069 | log->wqueue = bp; | |
2070 | bp->l_wqnext = tail->l_wqnext; | |
2071 | tail->l_wqnext = bp; | |
2072 | } | |
2073 | ||
2074 | tail = bp; | |
2075 | } | |
2076 | ||
2077 | /* is buffer at head of wqueue and for write ? */ | |
2078 | if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { | |
2079 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2080 | return; | |
2081 | } | |
2082 | ||
2083 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2084 | ||
2085 | if (cant_block) | |
2086 | lbmRedrive(bp); | |
2087 | else if (flag & lbmSYNC) | |
2088 | lbmStartIO(bp); | |
2089 | else { | |
2090 | LOGGC_UNLOCK(log); | |
2091 | lbmStartIO(bp); | |
2092 | LOGGC_LOCK(log); | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | ||
2097 | /* | |
2098 | * lbmDirectWrite() | |
2099 | * | |
2100 | * initiate pageout bypassing write queue for sidestream | |
2101 | * (e.g., log superblock) write; | |
2102 | */ | |
2103 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) | |
2104 | { | |
2105 | jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", | |
2106 | bp, flag, bp->l_pn); | |
2107 | ||
2108 | /* | |
2109 | * initialize buffer for device driver | |
2110 | */ | |
2111 | bp->l_flag = flag | lbmDIRECT; | |
2112 | ||
2113 | /* map the logical block address to physical block address */ | |
2114 | bp->l_blkno = | |
2115 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2116 | ||
2117 | /* | |
f720e3ba | 2118 | * initiate pageout of the page |
1da177e4 LT |
2119 | */ |
2120 | lbmStartIO(bp); | |
2121 | } | |
2122 | ||
2123 | ||
2124 | /* | |
2125 | * NAME: lbmStartIO() | |
2126 | * | |
2127 | * FUNCTION: Interface to DD strategy routine | |
2128 | * | |
f720e3ba | 2129 | * RETURN: none |
1da177e4 LT |
2130 | * |
2131 | * serialization: LCACHE_LOCK() is NOT held during log i/o; | |
2132 | */ | |
2133 | static void lbmStartIO(struct lbuf * bp) | |
2134 | { | |
2135 | struct bio *bio; | |
2136 | struct jfs_log *log = bp->l_log; | |
2137 | ||
2138 | jfs_info("lbmStartIO\n"); | |
2139 | ||
2140 | bio = bio_alloc(GFP_NOFS, 1); | |
2141 | bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); | |
2142 | bio->bi_bdev = log->bdev; | |
dc5798d9 | 2143 | bio->bi_io_vec[0].bv_page = bp->l_page; |
1da177e4 | 2144 | bio->bi_io_vec[0].bv_len = LOGPSIZE; |
dc5798d9 | 2145 | bio->bi_io_vec[0].bv_offset = bp->l_offset; |
1da177e4 LT |
2146 | |
2147 | bio->bi_vcnt = 1; | |
2148 | bio->bi_idx = 0; | |
2149 | bio->bi_size = LOGPSIZE; | |
2150 | ||
2151 | bio->bi_end_io = lbmIODone; | |
2152 | bio->bi_private = bp; | |
2153 | ||
2154 | /* check if journaling to disk has been disabled */ | |
dc5798d9 DK |
2155 | if (log->no_integrity) { |
2156 | bio->bi_size = 0; | |
e30408b2 | 2157 | lbmIODone(bio, 0); |
dc5798d9 | 2158 | } else { |
1da177e4 LT |
2159 | submit_bio(WRITE_SYNC, bio); |
2160 | INCREMENT(lmStat.submitted); | |
2161 | } | |
1da177e4 LT |
2162 | } |
2163 | ||
2164 | ||
2165 | /* | |
2166 | * lbmIOWait() | |
2167 | */ | |
2168 | static int lbmIOWait(struct lbuf * bp, int flag) | |
2169 | { | |
2170 | unsigned long flags; | |
2171 | int rc = 0; | |
2172 | ||
2173 | jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2174 | ||
2175 | LCACHE_LOCK(flags); /* disable+lock */ | |
2176 | ||
2177 | LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); | |
2178 | ||
2179 | rc = (bp->l_flag & lbmERROR) ? -EIO : 0; | |
2180 | ||
2181 | if (flag & lbmFREE) | |
2182 | lbmfree(bp); | |
2183 | ||
2184 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2185 | ||
2186 | jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2187 | return rc; | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * lbmIODone() | |
2192 | * | |
2193 | * executed at INTIODONE level | |
2194 | */ | |
6712ecf8 | 2195 | static void lbmIODone(struct bio *bio, int error) |
1da177e4 LT |
2196 | { |
2197 | struct lbuf *bp = bio->bi_private; | |
2198 | struct lbuf *nextbp, *tail; | |
2199 | struct jfs_log *log; | |
2200 | unsigned long flags; | |
2201 | ||
1da177e4 LT |
2202 | /* |
2203 | * get back jfs buffer bound to the i/o buffer | |
2204 | */ | |
2205 | jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); | |
2206 | ||
2207 | LCACHE_LOCK(flags); /* disable+lock */ | |
2208 | ||
2209 | bp->l_flag |= lbmDONE; | |
2210 | ||
2211 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { | |
2212 | bp->l_flag |= lbmERROR; | |
2213 | ||
2214 | jfs_err("lbmIODone: I/O error in JFS log"); | |
2215 | } | |
2216 | ||
2217 | bio_put(bio); | |
2218 | ||
2219 | /* | |
f720e3ba | 2220 | * pagein completion |
1da177e4 LT |
2221 | */ |
2222 | if (bp->l_flag & lbmREAD) { | |
2223 | bp->l_flag &= ~lbmREAD; | |
2224 | ||
2225 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2226 | ||
2227 | /* wakeup I/O initiator */ | |
2228 | LCACHE_WAKEUP(&bp->l_ioevent); | |
8d8fe642 DK |
2229 | |
2230 | return; | |
1da177e4 LT |
2231 | } |
2232 | ||
2233 | /* | |
f720e3ba | 2234 | * pageout completion |
1da177e4 LT |
2235 | * |
2236 | * the bp at the head of write queue has completed pageout. | |
2237 | * | |
2238 | * if single-commit/full-page pageout, remove the current buffer | |
2239 | * from head of pageout queue, and redrive pageout with | |
2240 | * the new buffer at head of pageout queue; | |
2241 | * otherwise, the partial-page pageout buffer stays at | |
2242 | * the head of pageout queue to be redriven for pageout | |
2243 | * by lmGroupCommit() until full-page pageout is completed. | |
2244 | */ | |
2245 | bp->l_flag &= ~lbmWRITE; | |
2246 | INCREMENT(lmStat.pagedone); | |
2247 | ||
2248 | /* update committed lsn */ | |
2249 | log = bp->l_log; | |
2250 | log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; | |
2251 | ||
2252 | if (bp->l_flag & lbmDIRECT) { | |
2253 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2254 | LCACHE_UNLOCK(flags); | |
8d8fe642 | 2255 | return; |
1da177e4 LT |
2256 | } |
2257 | ||
2258 | tail = log->wqueue; | |
2259 | ||
2260 | /* single element queue */ | |
2261 | if (bp == tail) { | |
2262 | /* remove head buffer of full-page pageout | |
2263 | * from log device write queue | |
2264 | */ | |
2265 | if (bp->l_flag & lbmRELEASE) { | |
2266 | log->wqueue = NULL; | |
2267 | bp->l_wqnext = NULL; | |
2268 | } | |
2269 | } | |
2270 | /* multi element queue */ | |
2271 | else { | |
2272 | /* remove head buffer of full-page pageout | |
2273 | * from log device write queue | |
2274 | */ | |
2275 | if (bp->l_flag & lbmRELEASE) { | |
2276 | nextbp = tail->l_wqnext = bp->l_wqnext; | |
2277 | bp->l_wqnext = NULL; | |
2278 | ||
2279 | /* | |
2280 | * redrive pageout of next page at head of write queue: | |
2281 | * redrive next page without any bound tblk | |
2282 | * (i.e., page w/o any COMMIT records), or | |
2283 | * first page of new group commit which has been | |
2284 | * queued after current page (subsequent pageout | |
2285 | * is performed synchronously, except page without | |
2286 | * any COMMITs) by lmGroupCommit() as indicated | |
2287 | * by lbmWRITE flag; | |
2288 | */ | |
2289 | if (nextbp->l_flag & lbmWRITE) { | |
2290 | /* | |
2291 | * We can't do the I/O at interrupt time. | |
2292 | * The jfsIO thread can do it | |
2293 | */ | |
2294 | lbmRedrive(nextbp); | |
2295 | } | |
2296 | } | |
2297 | } | |
2298 | ||
2299 | /* | |
f720e3ba | 2300 | * synchronous pageout: |
1da177e4 LT |
2301 | * |
2302 | * buffer has not necessarily been removed from write queue | |
2303 | * (e.g., synchronous write of partial-page with COMMIT): | |
2304 | * leave buffer for i/o initiator to dispose | |
2305 | */ | |
2306 | if (bp->l_flag & lbmSYNC) { | |
2307 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2308 | ||
2309 | /* wakeup I/O initiator */ | |
2310 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2311 | } | |
2312 | ||
2313 | /* | |
f720e3ba | 2314 | * Group Commit pageout: |
1da177e4 LT |
2315 | */ |
2316 | else if (bp->l_flag & lbmGC) { | |
2317 | LCACHE_UNLOCK(flags); | |
2318 | lmPostGC(bp); | |
2319 | } | |
2320 | ||
2321 | /* | |
f720e3ba | 2322 | * asynchronous pageout: |
1da177e4 LT |
2323 | * |
2324 | * buffer must have been removed from write queue: | |
2325 | * insert buffer at head of freelist where it can be recycled | |
2326 | */ | |
2327 | else { | |
2328 | assert(bp->l_flag & lbmRELEASE); | |
2329 | assert(bp->l_flag & lbmFREE); | |
2330 | lbmfree(bp); | |
2331 | ||
2332 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2333 | } | |
1da177e4 LT |
2334 | } |
2335 | ||
2336 | int jfsIOWait(void *arg) | |
2337 | { | |
2338 | struct lbuf *bp; | |
2339 | ||
1da177e4 | 2340 | do { |
1da177e4 | 2341 | spin_lock_irq(&log_redrive_lock); |
09aaa749 | 2342 | while ((bp = log_redrive_list)) { |
1da177e4 LT |
2343 | log_redrive_list = bp->l_redrive_next; |
2344 | bp->l_redrive_next = NULL; | |
2345 | spin_unlock_irq(&log_redrive_lock); | |
2346 | lbmStartIO(bp); | |
2347 | spin_lock_irq(&log_redrive_lock); | |
2348 | } | |
91dbb4de | 2349 | |
3e1d1d28 | 2350 | if (freezing(current)) { |
05ec9e26 | 2351 | spin_unlock_irq(&log_redrive_lock); |
a0acae0e | 2352 | try_to_freeze(); |
1da177e4 | 2353 | } else { |
1da177e4 | 2354 | set_current_state(TASK_INTERRUPTIBLE); |
05ec9e26 | 2355 | spin_unlock_irq(&log_redrive_lock); |
1da177e4 | 2356 | schedule(); |
3cbb1c8e | 2357 | __set_current_state(TASK_RUNNING); |
1da177e4 | 2358 | } |
91dbb4de | 2359 | } while (!kthread_should_stop()); |
1da177e4 LT |
2360 | |
2361 | jfs_info("jfsIOWait being killed!"); | |
91dbb4de | 2362 | return 0; |
1da177e4 LT |
2363 | } |
2364 | ||
2365 | /* | |
2366 | * NAME: lmLogFormat()/jfs_logform() | |
2367 | * | |
2368 | * FUNCTION: format file system log | |
2369 | * | |
2370 | * PARAMETERS: | |
f720e3ba | 2371 | * log - volume log |
1da177e4 LT |
2372 | * logAddress - start address of log space in FS block |
2373 | * logSize - length of log space in FS block; | |
2374 | * | |
2375 | * RETURN: 0 - success | |
2376 | * -EIO - i/o error | |
2377 | * | |
2378 | * XXX: We're synchronously writing one page at a time. This needs to | |
2379 | * be improved by writing multiple pages at once. | |
2380 | */ | |
2381 | int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) | |
2382 | { | |
2383 | int rc = -EIO; | |
2384 | struct jfs_sb_info *sbi; | |
2385 | struct logsuper *logsuper; | |
2386 | struct logpage *lp; | |
2387 | int lspn; /* log sequence page number */ | |
2388 | struct lrd *lrd_ptr; | |
2389 | int npages = 0; | |
2390 | struct lbuf *bp; | |
2391 | ||
2392 | jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", | |
2393 | (long long)logAddress, logSize); | |
2394 | ||
2395 | sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); | |
2396 | ||
2397 | /* allocate a log buffer */ | |
2398 | bp = lbmAllocate(log, 1); | |
2399 | ||
2400 | npages = logSize >> sbi->l2nbperpage; | |
2401 | ||
2402 | /* | |
f720e3ba | 2403 | * log space: |
1da177e4 LT |
2404 | * |
2405 | * page 0 - reserved; | |
2406 | * page 1 - log superblock; | |
2407 | * page 2 - log data page: A SYNC log record is written | |
f720e3ba | 2408 | * into this page at logform time; |
1da177e4 LT |
2409 | * pages 3-N - log data page: set to empty log data pages; |
2410 | */ | |
2411 | /* | |
f720e3ba | 2412 | * init log superblock: log page 1 |
1da177e4 LT |
2413 | */ |
2414 | logsuper = (struct logsuper *) bp->l_ldata; | |
2415 | ||
2416 | logsuper->magic = cpu_to_le32(LOGMAGIC); | |
2417 | logsuper->version = cpu_to_le32(LOGVERSION); | |
2418 | logsuper->state = cpu_to_le32(LOGREDONE); | |
2419 | logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ | |
2420 | logsuper->size = cpu_to_le32(npages); | |
2421 | logsuper->bsize = cpu_to_le32(sbi->bsize); | |
2422 | logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); | |
2423 | logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); | |
2424 | ||
2425 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2426 | bp->l_blkno = logAddress + sbi->nbperpage; | |
2427 | lbmStartIO(bp); | |
2428 | if ((rc = lbmIOWait(bp, 0))) | |
2429 | goto exit; | |
2430 | ||
2431 | /* | |
f720e3ba | 2432 | * init pages 2 to npages-1 as log data pages: |
1da177e4 LT |
2433 | * |
2434 | * log page sequence number (lpsn) initialization: | |
2435 | * | |
2436 | * pn: 0 1 2 3 n-1 | |
2437 | * +-----+-----+=====+=====+===.....===+=====+ | |
2438 | * lspn: N-1 0 1 N-2 | |
2439 | * <--- N page circular file ----> | |
2440 | * | |
2441 | * the N (= npages-2) data pages of the log is maintained as | |
2442 | * a circular file for the log records; | |
2443 | * lpsn grows by 1 monotonically as each log page is written | |
2444 | * to the circular file of the log; | |
2445 | * and setLogpage() will not reset the page number even if | |
2446 | * the eor is equal to LOGPHDRSIZE. In order for binary search | |
2447 | * still work in find log end process, we have to simulate the | |
2448 | * log wrap situation at the log format time. | |
2449 | * The 1st log page written will have the highest lpsn. Then | |
2450 | * the succeeding log pages will have ascending order of | |
2451 | * the lspn starting from 0, ... (N-2) | |
2452 | */ | |
2453 | lp = (struct logpage *) bp->l_ldata; | |
2454 | /* | |
2455 | * initialize 1st log page to be written: lpsn = N - 1, | |
2456 | * write a SYNCPT log record is written to this page | |
2457 | */ | |
2458 | lp->h.page = lp->t.page = cpu_to_le32(npages - 3); | |
2459 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); | |
2460 | ||
2461 | lrd_ptr = (struct lrd *) &lp->data; | |
2462 | lrd_ptr->logtid = 0; | |
2463 | lrd_ptr->backchain = 0; | |
2464 | lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); | |
2465 | lrd_ptr->length = 0; | |
2466 | lrd_ptr->log.syncpt.sync = 0; | |
2467 | ||
2468 | bp->l_blkno += sbi->nbperpage; | |
2469 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2470 | lbmStartIO(bp); | |
2471 | if ((rc = lbmIOWait(bp, 0))) | |
2472 | goto exit; | |
2473 | ||
2474 | /* | |
f720e3ba | 2475 | * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) |
1da177e4 LT |
2476 | */ |
2477 | for (lspn = 0; lspn < npages - 3; lspn++) { | |
2478 | lp->h.page = lp->t.page = cpu_to_le32(lspn); | |
2479 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
2480 | ||
2481 | bp->l_blkno += sbi->nbperpage; | |
2482 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2483 | lbmStartIO(bp); | |
2484 | if ((rc = lbmIOWait(bp, 0))) | |
2485 | goto exit; | |
2486 | } | |
2487 | ||
2488 | rc = 0; | |
2489 | exit: | |
2490 | /* | |
f720e3ba | 2491 | * finalize log |
1da177e4 LT |
2492 | */ |
2493 | /* release the buffer */ | |
2494 | lbmFree(bp); | |
2495 | ||
2496 | return rc; | |
2497 | } | |
2498 | ||
2499 | #ifdef CONFIG_JFS_STATISTICS | |
b2e03ca7 | 2500 | static int jfs_lmstats_proc_show(struct seq_file *m, void *v) |
1da177e4 | 2501 | { |
b2e03ca7 | 2502 | seq_printf(m, |
1da177e4 LT |
2503 | "JFS Logmgr stats\n" |
2504 | "================\n" | |
2505 | "commits = %d\n" | |
2506 | "writes submitted = %d\n" | |
2507 | "writes completed = %d\n" | |
2508 | "full pages submitted = %d\n" | |
2509 | "partial pages submitted = %d\n", | |
2510 | lmStat.commit, | |
2511 | lmStat.submitted, | |
2512 | lmStat.pagedone, | |
2513 | lmStat.full_page, | |
2514 | lmStat.partial_page); | |
b2e03ca7 AD |
2515 | return 0; |
2516 | } | |
1da177e4 | 2517 | |
b2e03ca7 AD |
2518 | static int jfs_lmstats_proc_open(struct inode *inode, struct file *file) |
2519 | { | |
2520 | return single_open(file, jfs_lmstats_proc_show, NULL); | |
1da177e4 | 2521 | } |
b2e03ca7 AD |
2522 | |
2523 | const struct file_operations jfs_lmstats_proc_fops = { | |
2524 | .owner = THIS_MODULE, | |
2525 | .open = jfs_lmstats_proc_open, | |
2526 | .read = seq_read, | |
2527 | .llseek = seq_lseek, | |
2528 | .release = single_release, | |
2529 | }; | |
1da177e4 | 2530 | #endif /* CONFIG_JFS_STATISTICS */ |