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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
1da177e4 LT |
5 | */ |
6 | ||
7 | /* | |
8 | * jfs_logmgr.c: log manager | |
9 | * | |
10 | * for related information, see transaction manager (jfs_txnmgr.c), and | |
11 | * recovery manager (jfs_logredo.c). | |
12 | * | |
13 | * note: for detail, RTFS. | |
14 | * | |
15 | * log buffer manager: | |
16 | * special purpose buffer manager supporting log i/o requirements. | |
17 | * per log serial pageout of logpage | |
18 | * queuing i/o requests and redrive i/o at iodone | |
19 | * maintain current logpage buffer | |
20 | * no caching since append only | |
21 | * appropriate jfs buffer cache buffers as needed | |
22 | * | |
23 | * group commit: | |
24 | * transactions which wrote COMMIT records in the same in-memory | |
25 | * log page during the pageout of previous/current log page(s) are | |
26 | * committed together by the pageout of the page. | |
27 | * | |
28 | * TBD lazy commit: | |
29 | * transactions are committed asynchronously when the log page | |
30 | * containing it COMMIT is paged out when it becomes full; | |
31 | * | |
32 | * serialization: | |
33 | * . a per log lock serialize log write. | |
34 | * . a per log lock serialize group commit. | |
35 | * . a per log lock serialize log open/close; | |
36 | * | |
37 | * TBD log integrity: | |
38 | * careful-write (ping-pong) of last logpage to recover from crash | |
39 | * in overwrite. | |
40 | * detection of split (out-of-order) write of physical sectors | |
41 | * of last logpage via timestamp at end of each sector | |
42 | * with its mirror data array at trailer). | |
43 | * | |
44 | * alternatives: | |
45 | * lsn - 64-bit monotonically increasing integer vs | |
46 | * 32-bit lspn and page eor. | |
47 | */ | |
48 | ||
49 | #include <linux/fs.h> | |
50 | #include <linux/blkdev.h> | |
51 | #include <linux/interrupt.h> | |
1da177e4 | 52 | #include <linux/completion.h> |
91dbb4de | 53 | #include <linux/kthread.h> |
1da177e4 LT |
54 | #include <linux/buffer_head.h> /* for sync_blockdev() */ |
55 | #include <linux/bio.h> | |
7dfb7103 | 56 | #include <linux/freezer.h> |
afeacc8c | 57 | #include <linux/export.h> |
1da177e4 | 58 | #include <linux/delay.h> |
353ab6e9 | 59 | #include <linux/mutex.h> |
b2e03ca7 | 60 | #include <linux/seq_file.h> |
5a0e3ad6 | 61 | #include <linux/slab.h> |
1da177e4 LT |
62 | #include "jfs_incore.h" |
63 | #include "jfs_filsys.h" | |
64 | #include "jfs_metapage.h" | |
1868f4aa | 65 | #include "jfs_superblock.h" |
1da177e4 LT |
66 | #include "jfs_txnmgr.h" |
67 | #include "jfs_debug.h" | |
68 | ||
69 | ||
70 | /* | |
71 | * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) | |
72 | */ | |
73 | static struct lbuf *log_redrive_list; | |
74 | static DEFINE_SPINLOCK(log_redrive_lock); | |
1da177e4 LT |
75 | |
76 | ||
77 | /* | |
78 | * log read/write serialization (per log) | |
79 | */ | |
1de87444 IM |
80 | #define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) |
81 | #define LOG_LOCK(log) mutex_lock(&((log)->loglock)) | |
82 | #define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock)) | |
1da177e4 LT |
83 | |
84 | ||
85 | /* | |
86 | * log group commit serialization (per log) | |
87 | */ | |
88 | ||
89 | #define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) | |
90 | #define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) | |
91 | #define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) | |
92 | #define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) | |
93 | ||
94 | /* | |
95 | * log sync serialization (per log) | |
96 | */ | |
97 | #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) | |
98 | #define LOGSYNC_BARRIER(logsize) ((logsize)/4) | |
99 | /* | |
100 | #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) | |
101 | #define LOGSYNC_BARRIER(logsize) ((logsize)/2) | |
102 | */ | |
103 | ||
104 | ||
105 | /* | |
106 | * log buffer cache synchronization | |
107 | */ | |
108 | static DEFINE_SPINLOCK(jfsLCacheLock); | |
109 | ||
110 | #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) | |
111 | #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) | |
112 | ||
113 | /* | |
114 | * See __SLEEP_COND in jfs_locks.h | |
115 | */ | |
116 | #define LCACHE_SLEEP_COND(wq, cond, flags) \ | |
117 | do { \ | |
118 | if (cond) \ | |
119 | break; \ | |
120 | __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ | |
121 | } while (0) | |
122 | ||
123 | #define LCACHE_WAKEUP(event) wake_up(event) | |
124 | ||
125 | ||
126 | /* | |
127 | * lbuf buffer cache (lCache) control | |
128 | */ | |
129 | /* log buffer manager pageout control (cumulative, inclusive) */ | |
130 | #define lbmREAD 0x0001 | |
131 | #define lbmWRITE 0x0002 /* enqueue at tail of write queue; | |
132 | * init pageout if at head of queue; | |
133 | */ | |
134 | #define lbmRELEASE 0x0004 /* remove from write queue | |
135 | * at completion of pageout; | |
136 | * do not free/recycle it yet: | |
137 | * caller will free it; | |
138 | */ | |
139 | #define lbmSYNC 0x0008 /* do not return to freelist | |
140 | * when removed from write queue; | |
141 | */ | |
142 | #define lbmFREE 0x0010 /* return to freelist | |
143 | * at completion of pageout; | |
144 | * the buffer may be recycled; | |
145 | */ | |
146 | #define lbmDONE 0x0020 | |
147 | #define lbmERROR 0x0040 | |
148 | #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing | |
149 | * of log page | |
150 | */ | |
151 | #define lbmDIRECT 0x0100 | |
152 | ||
153 | /* | |
154 | * Global list of active external journals | |
155 | */ | |
156 | static LIST_HEAD(jfs_external_logs); | |
bc4e6b28 | 157 | static struct jfs_log *dummy_log; |
353ab6e9 | 158 | static DEFINE_MUTEX(jfs_log_mutex); |
1da177e4 | 159 | |
1da177e4 LT |
160 | /* |
161 | * forward references | |
162 | */ | |
163 | static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, | |
164 | struct lrd * lrd, struct tlock * tlck); | |
165 | ||
166 | static int lmNextPage(struct jfs_log * log); | |
167 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
168 | int activate); | |
169 | ||
170 | static int open_inline_log(struct super_block *sb); | |
171 | static int open_dummy_log(struct super_block *sb); | |
172 | static int lbmLogInit(struct jfs_log * log); | |
173 | static void lbmLogShutdown(struct jfs_log * log); | |
174 | static struct lbuf *lbmAllocate(struct jfs_log * log, int); | |
175 | static void lbmFree(struct lbuf * bp); | |
176 | static void lbmfree(struct lbuf * bp); | |
177 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); | |
178 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); | |
179 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); | |
180 | static int lbmIOWait(struct lbuf * bp, int flag); | |
181 | static bio_end_io_t lbmIODone; | |
182 | static void lbmStartIO(struct lbuf * bp); | |
183 | static void lmGCwrite(struct jfs_log * log, int cant_block); | |
cbc3d65e | 184 | static int lmLogSync(struct jfs_log * log, int hard_sync); |
1da177e4 LT |
185 | |
186 | ||
187 | ||
188 | /* | |
189 | * statistics | |
190 | */ | |
191 | #ifdef CONFIG_JFS_STATISTICS | |
192 | static struct lmStat { | |
193 | uint commit; /* # of commit */ | |
194 | uint pagedone; /* # of page written */ | |
195 | uint submitted; /* # of pages submitted */ | |
196 | uint full_page; /* # of full pages submitted */ | |
197 | uint partial_page; /* # of partial pages submitted */ | |
198 | } lmStat; | |
199 | #endif | |
200 | ||
67e6682f DK |
201 | static void write_special_inodes(struct jfs_log *log, |
202 | int (*writer)(struct address_space *)) | |
203 | { | |
204 | struct jfs_sb_info *sbi; | |
205 | ||
206 | list_for_each_entry(sbi, &log->sb_list, log_list) { | |
207 | writer(sbi->ipbmap->i_mapping); | |
208 | writer(sbi->ipimap->i_mapping); | |
209 | writer(sbi->direct_inode->i_mapping); | |
210 | } | |
211 | } | |
1da177e4 LT |
212 | |
213 | /* | |
214 | * NAME: lmLog() | |
215 | * | |
216 | * FUNCTION: write a log record; | |
217 | * | |
218 | * PARAMETER: | |
219 | * | |
220 | * RETURN: lsn - offset to the next log record to write (end-of-log); | |
221 | * -1 - error; | |
222 | * | |
223 | * note: todo: log error handler | |
224 | */ | |
225 | int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
226 | struct tlock * tlck) | |
227 | { | |
228 | int lsn; | |
229 | int diffp, difft; | |
230 | struct metapage *mp = NULL; | |
7fab479b | 231 | unsigned long flags; |
1da177e4 LT |
232 | |
233 | jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", | |
234 | log, tblk, lrd, tlck); | |
235 | ||
236 | LOG_LOCK(log); | |
237 | ||
238 | /* log by (out-of-transaction) JFS ? */ | |
239 | if (tblk == NULL) | |
240 | goto writeRecord; | |
241 | ||
242 | /* log from page ? */ | |
243 | if (tlck == NULL || | |
244 | tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) | |
245 | goto writeRecord; | |
246 | ||
247 | /* | |
f720e3ba | 248 | * initialize/update page/transaction recovery lsn |
1da177e4 LT |
249 | */ |
250 | lsn = log->lsn; | |
251 | ||
7fab479b | 252 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
253 | |
254 | /* | |
255 | * initialize page lsn if first log write of the page | |
256 | */ | |
257 | if (mp->lsn == 0) { | |
258 | mp->log = log; | |
259 | mp->lsn = lsn; | |
260 | log->count++; | |
261 | ||
262 | /* insert page at tail of logsynclist */ | |
263 | list_add_tail(&mp->synclist, &log->synclist); | |
264 | } | |
265 | ||
266 | /* | |
f720e3ba | 267 | * initialize/update lsn of tblock of the page |
1da177e4 LT |
268 | * |
269 | * transaction inherits oldest lsn of pages associated | |
270 | * with allocation/deallocation of resources (their | |
271 | * log records are used to reconstruct allocation map | |
272 | * at recovery time: inode for inode allocation map, | |
273 | * B+-tree index of extent descriptors for block | |
274 | * allocation map); | |
275 | * allocation map pages inherit transaction lsn at | |
276 | * commit time to allow forwarding log syncpt past log | |
277 | * records associated with allocation/deallocation of | |
278 | * resources only after persistent map of these map pages | |
279 | * have been updated and propagated to home. | |
280 | */ | |
281 | /* | |
282 | * initialize transaction lsn: | |
283 | */ | |
284 | if (tblk->lsn == 0) { | |
285 | /* inherit lsn of its first page logged */ | |
286 | tblk->lsn = mp->lsn; | |
287 | log->count++; | |
288 | ||
289 | /* insert tblock after the page on logsynclist */ | |
290 | list_add(&tblk->synclist, &mp->synclist); | |
291 | } | |
292 | /* | |
293 | * update transaction lsn: | |
294 | */ | |
295 | else { | |
296 | /* inherit oldest/smallest lsn of page */ | |
297 | logdiff(diffp, mp->lsn, log); | |
298 | logdiff(difft, tblk->lsn, log); | |
299 | if (diffp < difft) { | |
300 | /* update tblock lsn with page lsn */ | |
301 | tblk->lsn = mp->lsn; | |
302 | ||
303 | /* move tblock after page on logsynclist */ | |
304 | list_move(&tblk->synclist, &mp->synclist); | |
305 | } | |
306 | } | |
307 | ||
7fab479b | 308 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
309 | |
310 | /* | |
f720e3ba | 311 | * write the log record |
1da177e4 LT |
312 | */ |
313 | writeRecord: | |
314 | lsn = lmWriteRecord(log, tblk, lrd, tlck); | |
315 | ||
316 | /* | |
317 | * forward log syncpt if log reached next syncpt trigger | |
318 | */ | |
319 | logdiff(diffp, lsn, log); | |
320 | if (diffp >= log->nextsync) | |
321 | lsn = lmLogSync(log, 0); | |
322 | ||
323 | /* update end-of-log lsn */ | |
324 | log->lsn = lsn; | |
325 | ||
326 | LOG_UNLOCK(log); | |
327 | ||
328 | /* return end-of-log address */ | |
329 | return lsn; | |
330 | } | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * NAME: lmWriteRecord() | |
334 | * | |
335 | * FUNCTION: move the log record to current log page | |
336 | * | |
337 | * PARAMETER: cd - commit descriptor | |
338 | * | |
339 | * RETURN: end-of-log address | |
63f83c9f | 340 | * |
1da177e4 LT |
341 | * serialization: LOG_LOCK() held on entry/exit |
342 | */ | |
343 | static int | |
344 | lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, | |
345 | struct tlock * tlck) | |
346 | { | |
347 | int lsn = 0; /* end-of-log address */ | |
348 | struct lbuf *bp; /* dst log page buffer */ | |
349 | struct logpage *lp; /* dst log page */ | |
350 | caddr_t dst; /* destination address in log page */ | |
351 | int dstoffset; /* end-of-log offset in log page */ | |
352 | int freespace; /* free space in log page */ | |
353 | caddr_t p; /* src meta-data page */ | |
354 | caddr_t src; | |
355 | int srclen; | |
356 | int nbytes; /* number of bytes to move */ | |
357 | int i; | |
358 | int len; | |
359 | struct linelock *linelock; | |
360 | struct lv *lv; | |
361 | struct lvd *lvd; | |
362 | int l2linesize; | |
363 | ||
364 | len = 0; | |
365 | ||
366 | /* retrieve destination log page to write */ | |
367 | bp = (struct lbuf *) log->bp; | |
368 | lp = (struct logpage *) bp->l_ldata; | |
369 | dstoffset = log->eor; | |
370 | ||
371 | /* any log data to write ? */ | |
372 | if (tlck == NULL) | |
373 | goto moveLrd; | |
374 | ||
375 | /* | |
f720e3ba | 376 | * move log record data |
1da177e4 LT |
377 | */ |
378 | /* retrieve source meta-data page to log */ | |
379 | if (tlck->flag & tlckPAGELOCK) { | |
380 | p = (caddr_t) (tlck->mp->data); | |
381 | linelock = (struct linelock *) & tlck->lock; | |
382 | } | |
383 | /* retrieve source in-memory inode to log */ | |
384 | else if (tlck->flag & tlckINODELOCK) { | |
385 | if (tlck->type & tlckDTREE) | |
386 | p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; | |
387 | else | |
388 | p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; | |
389 | linelock = (struct linelock *) & tlck->lock; | |
390 | } | |
1da177e4 LT |
391 | else { |
392 | jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); | |
393 | return 0; /* Probably should trap */ | |
394 | } | |
395 | l2linesize = linelock->l2linesize; | |
396 | ||
397 | moveData: | |
398 | ASSERT(linelock->index <= linelock->maxcnt); | |
399 | ||
400 | lv = linelock->lv; | |
401 | for (i = 0; i < linelock->index; i++, lv++) { | |
402 | if (lv->length == 0) | |
403 | continue; | |
404 | ||
405 | /* is page full ? */ | |
406 | if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { | |
407 | /* page become full: move on to next page */ | |
408 | lmNextPage(log); | |
409 | ||
410 | bp = log->bp; | |
411 | lp = (struct logpage *) bp->l_ldata; | |
412 | dstoffset = LOGPHDRSIZE; | |
413 | } | |
414 | ||
415 | /* | |
416 | * move log vector data | |
417 | */ | |
418 | src = (u8 *) p + (lv->offset << l2linesize); | |
419 | srclen = lv->length << l2linesize; | |
420 | len += srclen; | |
421 | while (srclen > 0) { | |
422 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
423 | nbytes = min(freespace, srclen); | |
424 | dst = (caddr_t) lp + dstoffset; | |
425 | memcpy(dst, src, nbytes); | |
426 | dstoffset += nbytes; | |
427 | ||
428 | /* is page not full ? */ | |
429 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
430 | break; | |
431 | ||
432 | /* page become full: move on to next page */ | |
433 | lmNextPage(log); | |
434 | ||
435 | bp = (struct lbuf *) log->bp; | |
436 | lp = (struct logpage *) bp->l_ldata; | |
437 | dstoffset = LOGPHDRSIZE; | |
438 | ||
439 | srclen -= nbytes; | |
440 | src += nbytes; | |
441 | } | |
442 | ||
443 | /* | |
444 | * move log vector descriptor | |
445 | */ | |
446 | len += 4; | |
447 | lvd = (struct lvd *) ((caddr_t) lp + dstoffset); | |
448 | lvd->offset = cpu_to_le16(lv->offset); | |
449 | lvd->length = cpu_to_le16(lv->length); | |
450 | dstoffset += 4; | |
451 | jfs_info("lmWriteRecord: lv offset:%d length:%d", | |
452 | lv->offset, lv->length); | |
453 | } | |
454 | ||
455 | if ((i = linelock->next)) { | |
456 | linelock = (struct linelock *) lid_to_tlock(i); | |
457 | goto moveData; | |
458 | } | |
459 | ||
460 | /* | |
f720e3ba | 461 | * move log record descriptor |
1da177e4 LT |
462 | */ |
463 | moveLrd: | |
464 | lrd->length = cpu_to_le16(len); | |
465 | ||
466 | src = (caddr_t) lrd; | |
467 | srclen = LOGRDSIZE; | |
468 | ||
469 | while (srclen > 0) { | |
470 | freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; | |
471 | nbytes = min(freespace, srclen); | |
472 | dst = (caddr_t) lp + dstoffset; | |
473 | memcpy(dst, src, nbytes); | |
474 | ||
475 | dstoffset += nbytes; | |
476 | srclen -= nbytes; | |
477 | ||
478 | /* are there more to move than freespace of page ? */ | |
479 | if (srclen) | |
480 | goto pageFull; | |
481 | ||
482 | /* | |
483 | * end of log record descriptor | |
484 | */ | |
485 | ||
486 | /* update last log record eor */ | |
487 | log->eor = dstoffset; | |
488 | bp->l_eor = dstoffset; | |
489 | lsn = (log->page << L2LOGPSIZE) + dstoffset; | |
490 | ||
491 | if (lrd->type & cpu_to_le16(LOG_COMMIT)) { | |
492 | tblk->clsn = lsn; | |
493 | jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, | |
494 | bp->l_eor); | |
495 | ||
496 | INCREMENT(lmStat.commit); /* # of commit */ | |
497 | ||
498 | /* | |
499 | * enqueue tblock for group commit: | |
500 | * | |
501 | * enqueue tblock of non-trivial/synchronous COMMIT | |
502 | * at tail of group commit queue | |
503 | * (trivial/asynchronous COMMITs are ignored by | |
504 | * group commit.) | |
505 | */ | |
506 | LOGGC_LOCK(log); | |
507 | ||
508 | /* init tblock gc state */ | |
509 | tblk->flag = tblkGC_QUEUE; | |
510 | tblk->bp = log->bp; | |
511 | tblk->pn = log->page; | |
512 | tblk->eor = log->eor; | |
513 | ||
514 | /* enqueue transaction to commit queue */ | |
515 | list_add_tail(&tblk->cqueue, &log->cqueue); | |
516 | ||
517 | LOGGC_UNLOCK(log); | |
518 | } | |
519 | ||
520 | jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", | |
521 | le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); | |
522 | ||
523 | /* page not full ? */ | |
524 | if (dstoffset < LOGPSIZE - LOGPTLRSIZE) | |
525 | return lsn; | |
526 | ||
527 | pageFull: | |
528 | /* page become full: move on to next page */ | |
529 | lmNextPage(log); | |
530 | ||
531 | bp = (struct lbuf *) log->bp; | |
532 | lp = (struct logpage *) bp->l_ldata; | |
533 | dstoffset = LOGPHDRSIZE; | |
534 | src += nbytes; | |
535 | } | |
536 | ||
537 | return lsn; | |
538 | } | |
539 | ||
540 | ||
541 | /* | |
542 | * NAME: lmNextPage() | |
543 | * | |
544 | * FUNCTION: write current page and allocate next page. | |
545 | * | |
546 | * PARAMETER: log | |
547 | * | |
548 | * RETURN: 0 | |
63f83c9f | 549 | * |
1da177e4 LT |
550 | * serialization: LOG_LOCK() held on entry/exit |
551 | */ | |
552 | static int lmNextPage(struct jfs_log * log) | |
553 | { | |
554 | struct logpage *lp; | |
555 | int lspn; /* log sequence page number */ | |
556 | int pn; /* current page number */ | |
557 | struct lbuf *bp; | |
558 | struct lbuf *nextbp; | |
559 | struct tblock *tblk; | |
560 | ||
561 | /* get current log page number and log sequence page number */ | |
562 | pn = log->page; | |
563 | bp = log->bp; | |
564 | lp = (struct logpage *) bp->l_ldata; | |
565 | lspn = le32_to_cpu(lp->h.page); | |
566 | ||
567 | LOGGC_LOCK(log); | |
568 | ||
569 | /* | |
f720e3ba | 570 | * write or queue the full page at the tail of write queue |
1da177e4 LT |
571 | */ |
572 | /* get the tail tblk on commit queue */ | |
573 | if (list_empty(&log->cqueue)) | |
574 | tblk = NULL; | |
575 | else | |
576 | tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
577 | ||
578 | /* every tblk who has COMMIT record on the current page, | |
579 | * and has not been committed, must be on commit queue | |
580 | * since tblk is queued at commit queueu at the time | |
581 | * of writing its COMMIT record on the page before | |
582 | * page becomes full (even though the tblk thread | |
583 | * who wrote COMMIT record may have been suspended | |
584 | * currently); | |
585 | */ | |
586 | ||
587 | /* is page bound with outstanding tail tblk ? */ | |
588 | if (tblk && tblk->pn == pn) { | |
589 | /* mark tblk for end-of-page */ | |
590 | tblk->flag |= tblkGC_EOP; | |
591 | ||
592 | if (log->cflag & logGC_PAGEOUT) { | |
593 | /* if page is not already on write queue, | |
594 | * just enqueue (no lbmWRITE to prevent redrive) | |
595 | * buffer to wqueue to ensure correct serial order | |
596 | * of the pages since log pages will be added | |
597 | * continuously | |
598 | */ | |
599 | if (bp->l_wqnext == NULL) | |
600 | lbmWrite(log, bp, 0, 0); | |
601 | } else { | |
602 | /* | |
603 | * No current GC leader, initiate group commit | |
604 | */ | |
605 | log->cflag |= logGC_PAGEOUT; | |
606 | lmGCwrite(log, 0); | |
607 | } | |
608 | } | |
609 | /* page is not bound with outstanding tblk: | |
610 | * init write or mark it to be redriven (lbmWRITE) | |
611 | */ | |
612 | else { | |
613 | /* finalize the page */ | |
614 | bp->l_ceor = bp->l_eor; | |
615 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
616 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); | |
617 | } | |
618 | LOGGC_UNLOCK(log); | |
619 | ||
620 | /* | |
f720e3ba | 621 | * allocate/initialize next page |
1da177e4 LT |
622 | */ |
623 | /* if log wraps, the first data page of log is 2 | |
624 | * (0 never used, 1 is superblock). | |
625 | */ | |
626 | log->page = (pn == log->size - 1) ? 2 : pn + 1; | |
627 | log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ | |
628 | ||
629 | /* allocate/initialize next log page buffer */ | |
630 | nextbp = lbmAllocate(log, log->page); | |
631 | nextbp->l_eor = log->eor; | |
632 | log->bp = nextbp; | |
633 | ||
634 | /* initialize next log page */ | |
635 | lp = (struct logpage *) nextbp->l_ldata; | |
636 | lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); | |
637 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | ||
643 | /* | |
644 | * NAME: lmGroupCommit() | |
645 | * | |
646 | * FUNCTION: group commit | |
647 | * initiate pageout of the pages with COMMIT in the order of | |
648 | * page number - redrive pageout of the page at the head of | |
649 | * pageout queue until full page has been written. | |
650 | * | |
63f83c9f | 651 | * RETURN: |
1da177e4 LT |
652 | * |
653 | * NOTE: | |
654 | * LOGGC_LOCK serializes log group commit queue, and | |
655 | * transaction blocks on the commit queue. | |
656 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
657 | */ | |
658 | int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) | |
659 | { | |
660 | int rc = 0; | |
661 | ||
662 | LOGGC_LOCK(log); | |
663 | ||
664 | /* group committed already ? */ | |
665 | if (tblk->flag & tblkGC_COMMITTED) { | |
666 | if (tblk->flag & tblkGC_ERROR) | |
667 | rc = -EIO; | |
668 | ||
669 | LOGGC_UNLOCK(log); | |
670 | return rc; | |
671 | } | |
672 | jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); | |
673 | ||
674 | if (tblk->xflag & COMMIT_LAZY) | |
675 | tblk->flag |= tblkGC_LAZY; | |
676 | ||
677 | if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && | |
678 | (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) | |
679 | || jfs_tlocks_low)) { | |
680 | /* | |
681 | * No pageout in progress | |
682 | * | |
683 | * start group commit as its group leader. | |
684 | */ | |
685 | log->cflag |= logGC_PAGEOUT; | |
686 | ||
687 | lmGCwrite(log, 0); | |
688 | } | |
689 | ||
690 | if (tblk->xflag & COMMIT_LAZY) { | |
691 | /* | |
692 | * Lazy transactions can leave now | |
693 | */ | |
694 | LOGGC_UNLOCK(log); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | /* lmGCwrite gives up LOGGC_LOCK, check again */ | |
699 | ||
700 | if (tblk->flag & tblkGC_COMMITTED) { | |
701 | if (tblk->flag & tblkGC_ERROR) | |
702 | rc = -EIO; | |
703 | ||
704 | LOGGC_UNLOCK(log); | |
705 | return rc; | |
706 | } | |
707 | ||
708 | /* upcount transaction waiting for completion | |
709 | */ | |
710 | log->gcrtc++; | |
711 | tblk->flag |= tblkGC_READY; | |
712 | ||
713 | __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), | |
714 | LOGGC_LOCK(log), LOGGC_UNLOCK(log)); | |
715 | ||
716 | /* removed from commit queue */ | |
717 | if (tblk->flag & tblkGC_ERROR) | |
718 | rc = -EIO; | |
719 | ||
720 | LOGGC_UNLOCK(log); | |
721 | return rc; | |
722 | } | |
723 | ||
724 | /* | |
725 | * NAME: lmGCwrite() | |
726 | * | |
727 | * FUNCTION: group commit write | |
728 | * initiate write of log page, building a group of all transactions | |
729 | * with commit records on that page. | |
730 | * | |
731 | * RETURN: None | |
732 | * | |
733 | * NOTE: | |
734 | * LOGGC_LOCK must be held by caller. | |
735 | * N.B. LOG_LOCK is NOT held during lmGroupCommit(). | |
736 | */ | |
737 | static void lmGCwrite(struct jfs_log * log, int cant_write) | |
738 | { | |
739 | struct lbuf *bp; | |
740 | struct logpage *lp; | |
741 | int gcpn; /* group commit page number */ | |
742 | struct tblock *tblk; | |
743 | struct tblock *xtblk = NULL; | |
744 | ||
745 | /* | |
746 | * build the commit group of a log page | |
747 | * | |
748 | * scan commit queue and make a commit group of all | |
749 | * transactions with COMMIT records on the same log page. | |
750 | */ | |
751 | /* get the head tblk on the commit queue */ | |
752 | gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; | |
753 | ||
754 | list_for_each_entry(tblk, &log->cqueue, cqueue) { | |
755 | if (tblk->pn != gcpn) | |
756 | break; | |
757 | ||
758 | xtblk = tblk; | |
759 | ||
760 | /* state transition: (QUEUE, READY) -> COMMIT */ | |
761 | tblk->flag |= tblkGC_COMMIT; | |
762 | } | |
763 | tblk = xtblk; /* last tblk of the page */ | |
764 | ||
765 | /* | |
766 | * pageout to commit transactions on the log page. | |
767 | */ | |
768 | bp = (struct lbuf *) tblk->bp; | |
769 | lp = (struct logpage *) bp->l_ldata; | |
770 | /* is page already full ? */ | |
771 | if (tblk->flag & tblkGC_EOP) { | |
772 | /* mark page to free at end of group commit of the page */ | |
773 | tblk->flag &= ~tblkGC_EOP; | |
774 | tblk->flag |= tblkGC_FREE; | |
775 | bp->l_ceor = bp->l_eor; | |
776 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
777 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, | |
778 | cant_write); | |
779 | INCREMENT(lmStat.full_page); | |
780 | } | |
781 | /* page is not yet full */ | |
782 | else { | |
783 | bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ | |
784 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); | |
785 | lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); | |
786 | INCREMENT(lmStat.partial_page); | |
787 | } | |
788 | } | |
789 | ||
790 | /* | |
791 | * NAME: lmPostGC() | |
792 | * | |
793 | * FUNCTION: group commit post-processing | |
794 | * Processes transactions after their commit records have been written | |
795 | * to disk, redriving log I/O if necessary. | |
796 | * | |
797 | * RETURN: None | |
798 | * | |
799 | * NOTE: | |
800 | * This routine is called a interrupt time by lbmIODone | |
801 | */ | |
802 | static void lmPostGC(struct lbuf * bp) | |
803 | { | |
804 | unsigned long flags; | |
805 | struct jfs_log *log = bp->l_log; | |
806 | struct logpage *lp; | |
807 | struct tblock *tblk, *temp; | |
808 | ||
809 | //LOGGC_LOCK(log); | |
810 | spin_lock_irqsave(&log->gclock, flags); | |
811 | /* | |
812 | * current pageout of group commit completed. | |
813 | * | |
814 | * remove/wakeup transactions from commit queue who were | |
815 | * group committed with the current log page | |
816 | */ | |
817 | list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { | |
818 | if (!(tblk->flag & tblkGC_COMMIT)) | |
819 | break; | |
820 | /* if transaction was marked GC_COMMIT then | |
821 | * it has been shipped in the current pageout | |
822 | * and made it to disk - it is committed. | |
823 | */ | |
824 | ||
825 | if (bp->l_flag & lbmERROR) | |
826 | tblk->flag |= tblkGC_ERROR; | |
827 | ||
828 | /* remove it from the commit queue */ | |
829 | list_del(&tblk->cqueue); | |
830 | tblk->flag &= ~tblkGC_QUEUE; | |
831 | ||
832 | if (tblk == log->flush_tblk) { | |
833 | /* we can stop flushing the log now */ | |
834 | clear_bit(log_FLUSH, &log->flag); | |
835 | log->flush_tblk = NULL; | |
836 | } | |
837 | ||
838 | jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, | |
839 | tblk->flag); | |
840 | ||
841 | if (!(tblk->xflag & COMMIT_FORCE)) | |
842 | /* | |
843 | * Hand tblk over to lazy commit thread | |
844 | */ | |
845 | txLazyUnlock(tblk); | |
846 | else { | |
847 | /* state transition: COMMIT -> COMMITTED */ | |
848 | tblk->flag |= tblkGC_COMMITTED; | |
849 | ||
850 | if (tblk->flag & tblkGC_READY) | |
851 | log->gcrtc--; | |
852 | ||
853 | LOGGC_WAKEUP(tblk); | |
854 | } | |
855 | ||
856 | /* was page full before pageout ? | |
857 | * (and this is the last tblk bound with the page) | |
858 | */ | |
859 | if (tblk->flag & tblkGC_FREE) | |
860 | lbmFree(bp); | |
861 | /* did page become full after pageout ? | |
862 | * (and this is the last tblk bound with the page) | |
863 | */ | |
864 | else if (tblk->flag & tblkGC_EOP) { | |
865 | /* finalize the page */ | |
866 | lp = (struct logpage *) bp->l_ldata; | |
867 | bp->l_ceor = bp->l_eor; | |
868 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
869 | jfs_info("lmPostGC: calling lbmWrite"); | |
870 | lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, | |
871 | 1); | |
872 | } | |
873 | ||
874 | } | |
875 | ||
876 | /* are there any transactions who have entered lnGroupCommit() | |
877 | * (whose COMMITs are after that of the last log page written. | |
878 | * They are waiting for new group commit (above at (SLEEP 1)) | |
879 | * or lazy transactions are on a full (queued) log page, | |
880 | * select the latest ready transaction as new group leader and | |
881 | * wake her up to lead her group. | |
882 | */ | |
883 | if ((!list_empty(&log->cqueue)) && | |
884 | ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || | |
885 | test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) | |
886 | /* | |
887 | * Call lmGCwrite with new group leader | |
888 | */ | |
889 | lmGCwrite(log, 1); | |
890 | ||
891 | /* no transaction are ready yet (transactions are only just | |
892 | * queued (GC_QUEUE) and not entered for group commit yet). | |
893 | * the first transaction entering group commit | |
894 | * will elect herself as new group leader. | |
895 | */ | |
896 | else | |
897 | log->cflag &= ~logGC_PAGEOUT; | |
898 | ||
899 | //LOGGC_UNLOCK(log); | |
900 | spin_unlock_irqrestore(&log->gclock, flags); | |
901 | return; | |
902 | } | |
903 | ||
904 | /* | |
905 | * NAME: lmLogSync() | |
906 | * | |
907 | * FUNCTION: write log SYNCPT record for specified log | |
908 | * if new sync address is available | |
909 | * (normally the case if sync() is executed by back-ground | |
910 | * process). | |
1da177e4 LT |
911 | * calculate new value of i_nextsync which determines when |
912 | * this code is called again. | |
913 | * | |
1c627829 | 914 | * PARAMETERS: log - log structure |
63f83c9f | 915 | * hard_sync - 1 to force all metadata to be written |
1da177e4 LT |
916 | * |
917 | * RETURN: 0 | |
63f83c9f | 918 | * |
1da177e4 LT |
919 | * serialization: LOG_LOCK() held on entry/exit |
920 | */ | |
cbc3d65e | 921 | static int lmLogSync(struct jfs_log * log, int hard_sync) |
1da177e4 LT |
922 | { |
923 | int logsize; | |
924 | int written; /* written since last syncpt */ | |
925 | int free; /* free space left available */ | |
926 | int delta; /* additional delta to write normally */ | |
927 | int more; /* additional write granted */ | |
928 | struct lrd lrd; | |
929 | int lsn; | |
930 | struct logsyncblk *lp; | |
7fab479b DK |
931 | unsigned long flags; |
932 | ||
933 | /* push dirty metapages out to disk */ | |
cbc3d65e | 934 | if (hard_sync) |
67e6682f | 935 | write_special_inodes(log, filemap_fdatawrite); |
cbc3d65e | 936 | else |
67e6682f | 937 | write_special_inodes(log, filemap_flush); |
1da177e4 LT |
938 | |
939 | /* | |
f720e3ba | 940 | * forward syncpt |
1da177e4 LT |
941 | */ |
942 | /* if last sync is same as last syncpt, | |
943 | * invoke sync point forward processing to update sync. | |
944 | */ | |
945 | ||
946 | if (log->sync == log->syncpt) { | |
7fab479b | 947 | LOGSYNC_LOCK(log, flags); |
1da177e4 LT |
948 | if (list_empty(&log->synclist)) |
949 | log->sync = log->lsn; | |
950 | else { | |
951 | lp = list_entry(log->synclist.next, | |
952 | struct logsyncblk, synclist); | |
953 | log->sync = lp->lsn; | |
954 | } | |
7fab479b | 955 | LOGSYNC_UNLOCK(log, flags); |
1da177e4 LT |
956 | |
957 | } | |
958 | ||
959 | /* if sync is different from last syncpt, | |
960 | * write a SYNCPT record with syncpt = sync. | |
961 | * reset syncpt = sync | |
962 | */ | |
963 | if (log->sync != log->syncpt) { | |
1da177e4 LT |
964 | lrd.logtid = 0; |
965 | lrd.backchain = 0; | |
966 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
967 | lrd.length = 0; | |
968 | lrd.log.syncpt.sync = cpu_to_le32(log->sync); | |
969 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
970 | ||
971 | log->syncpt = log->sync; | |
972 | } else | |
973 | lsn = log->lsn; | |
974 | ||
975 | /* | |
f720e3ba | 976 | * setup next syncpt trigger (SWAG) |
1da177e4 LT |
977 | */ |
978 | logsize = log->logsize; | |
979 | ||
980 | logdiff(written, lsn, log); | |
981 | free = logsize - written; | |
982 | delta = LOGSYNC_DELTA(logsize); | |
983 | more = min(free / 2, delta); | |
984 | if (more < 2 * LOGPSIZE) { | |
985 | jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); | |
986 | /* | |
f720e3ba | 987 | * log wrapping |
1da177e4 LT |
988 | * |
989 | * option 1 - panic ? No.! | |
990 | * option 2 - shutdown file systems | |
f720e3ba | 991 | * associated with log ? |
1da177e4 | 992 | * option 3 - extend log ? |
1da177e4 LT |
993 | * option 4 - second chance |
994 | * | |
995 | * mark log wrapped, and continue. | |
996 | * when all active transactions are completed, | |
817f2c84 | 997 | * mark log valid for recovery. |
1da177e4 | 998 | * if crashed during invalid state, log state |
817f2c84 | 999 | * implies invalid log, forcing fsck(). |
1da177e4 LT |
1000 | */ |
1001 | /* mark log state log wrap in log superblock */ | |
1002 | /* log->state = LOGWRAP; */ | |
1003 | ||
1004 | /* reset sync point computation */ | |
1005 | log->syncpt = log->sync = lsn; | |
1006 | log->nextsync = delta; | |
1007 | } else | |
1008 | /* next syncpt trigger = written + more */ | |
1009 | log->nextsync = written + more; | |
1010 | ||
1da177e4 LT |
1011 | /* if number of bytes written from last sync point is more |
1012 | * than 1/4 of the log size, stop new transactions from | |
1013 | * starting until all current transactions are completed | |
1014 | * by setting syncbarrier flag. | |
1015 | */ | |
c2783f3a DK |
1016 | if (!test_bit(log_SYNCBARRIER, &log->flag) && |
1017 | (written > LOGSYNC_BARRIER(logsize)) && log->active) { | |
1da177e4 LT |
1018 | set_bit(log_SYNCBARRIER, &log->flag); |
1019 | jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, | |
1020 | log->syncpt); | |
1021 | /* | |
1022 | * We may have to initiate group commit | |
1023 | */ | |
1024 | jfs_flush_journal(log, 0); | |
1025 | } | |
1026 | ||
1027 | return lsn; | |
1028 | } | |
1029 | ||
1c627829 DK |
1030 | /* |
1031 | * NAME: jfs_syncpt | |
1032 | * | |
1033 | * FUNCTION: write log SYNCPT record for specified log | |
1034 | * | |
cbc3d65e | 1035 | * PARAMETERS: log - log structure |
63f83c9f | 1036 | * hard_sync - set to 1 to force metadata to be written |
1c627829 | 1037 | */ |
cbc3d65e | 1038 | void jfs_syncpt(struct jfs_log *log, int hard_sync) |
1c627829 | 1039 | { LOG_LOCK(log); |
73aaa22d DK |
1040 | if (!test_bit(log_QUIESCE, &log->flag)) |
1041 | lmLogSync(log, hard_sync); | |
1c627829 DK |
1042 | LOG_UNLOCK(log); |
1043 | } | |
1da177e4 LT |
1044 | |
1045 | /* | |
1046 | * NAME: lmLogOpen() | |
1047 | * | |
f720e3ba | 1048 | * FUNCTION: open the log on first open; |
1da177e4 LT |
1049 | * insert filesystem in the active list of the log. |
1050 | * | |
1051 | * PARAMETER: ipmnt - file system mount inode | |
63f83c9f | 1052 | * iplog - log inode (out) |
1da177e4 LT |
1053 | * |
1054 | * RETURN: | |
1055 | * | |
1056 | * serialization: | |
1057 | */ | |
1058 | int lmLogOpen(struct super_block *sb) | |
1059 | { | |
1060 | int rc; | |
1061 | struct block_device *bdev; | |
1062 | struct jfs_log *log; | |
1063 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1064 | ||
1065 | if (sbi->flag & JFS_NOINTEGRITY) | |
1066 | return open_dummy_log(sb); | |
63f83c9f | 1067 | |
1da177e4 LT |
1068 | if (sbi->mntflag & JFS_INLINELOG) |
1069 | return open_inline_log(sb); | |
1070 | ||
353ab6e9 | 1071 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1072 | list_for_each_entry(log, &jfs_external_logs, journal_list) { |
1073 | if (log->bdev->bd_dev == sbi->logdev) { | |
2e3bc612 | 1074 | if (!uuid_equal(&log->uuid, &sbi->loguuid)) { |
b18db6de | 1075 | jfs_warn("wrong uuid on JFS journal"); |
353ab6e9 | 1076 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1077 | return -EINVAL; |
1078 | } | |
1079 | /* | |
1080 | * add file system to log active file system list | |
1081 | */ | |
1082 | if ((rc = lmLogFileSystem(log, sbi, 1))) { | |
353ab6e9 | 1083 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1084 | return rc; |
1085 | } | |
1086 | goto journal_found; | |
1087 | } | |
1088 | } | |
1089 | ||
5b3030e3 | 1090 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
353ab6e9 | 1091 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1092 | return -ENOMEM; |
1093 | } | |
1da177e4 LT |
1094 | INIT_LIST_HEAD(&log->sb_list); |
1095 | init_waitqueue_head(&log->syncwait); | |
1096 | ||
1097 | /* | |
f720e3ba | 1098 | * external log as separate logical volume |
1da177e4 LT |
1099 | * |
1100 | * file systems to log may have n-to-1 relationship; | |
1101 | */ | |
1102 | ||
d4d77629 TH |
1103 | bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
1104 | log); | |
1da177e4 | 1105 | if (IS_ERR(bdev)) { |
9054760f | 1106 | rc = PTR_ERR(bdev); |
1da177e4 LT |
1107 | goto free; |
1108 | } | |
1109 | ||
1da177e4 | 1110 | log->bdev = bdev; |
2e3bc612 | 1111 | uuid_copy(&log->uuid, &sbi->loguuid); |
63f83c9f | 1112 | |
1da177e4 LT |
1113 | /* |
1114 | * initialize log: | |
1115 | */ | |
1116 | if ((rc = lmLogInit(log))) | |
e525fd89 | 1117 | goto close; |
1da177e4 LT |
1118 | |
1119 | list_add(&log->journal_list, &jfs_external_logs); | |
1120 | ||
1121 | /* | |
1122 | * add file system to log active file system list | |
1123 | */ | |
1124 | if ((rc = lmLogFileSystem(log, sbi, 1))) | |
1125 | goto shutdown; | |
1126 | ||
1127 | journal_found: | |
1128 | LOG_LOCK(log); | |
1129 | list_add(&sbi->log_list, &log->sb_list); | |
1130 | sbi->log = log; | |
1131 | LOG_UNLOCK(log); | |
1132 | ||
353ab6e9 | 1133 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1134 | return 0; |
1135 | ||
1136 | /* | |
f720e3ba | 1137 | * unwind on error |
1da177e4 LT |
1138 | */ |
1139 | shutdown: /* unwind lbmLogInit() */ | |
1140 | list_del(&log->journal_list); | |
1141 | lbmLogShutdown(log); | |
1142 | ||
1da177e4 | 1143 | close: /* close external log device */ |
e525fd89 | 1144 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1145 | |
1146 | free: /* free log descriptor */ | |
353ab6e9 | 1147 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1148 | kfree(log); |
1149 | ||
1150 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1151 | return rc; | |
1152 | } | |
1153 | ||
1154 | static int open_inline_log(struct super_block *sb) | |
1155 | { | |
1156 | struct jfs_log *log; | |
1157 | int rc; | |
1158 | ||
5b3030e3 | 1159 | if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
1da177e4 | 1160 | return -ENOMEM; |
1da177e4 LT |
1161 | INIT_LIST_HEAD(&log->sb_list); |
1162 | init_waitqueue_head(&log->syncwait); | |
1163 | ||
1164 | set_bit(log_INLINELOG, &log->flag); | |
1165 | log->bdev = sb->s_bdev; | |
1166 | log->base = addressPXD(&JFS_SBI(sb)->logpxd); | |
1167 | log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> | |
1168 | (L2LOGPSIZE - sb->s_blocksize_bits); | |
1169 | log->l2bsize = sb->s_blocksize_bits; | |
1170 | ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); | |
1171 | ||
1172 | /* | |
1173 | * initialize log. | |
1174 | */ | |
1175 | if ((rc = lmLogInit(log))) { | |
1176 | kfree(log); | |
1177 | jfs_warn("lmLogOpen: exit(%d)", rc); | |
1178 | return rc; | |
1179 | } | |
1180 | ||
1181 | list_add(&JFS_SBI(sb)->log_list, &log->sb_list); | |
1182 | JFS_SBI(sb)->log = log; | |
1183 | ||
1184 | return rc; | |
1185 | } | |
1186 | ||
1187 | static int open_dummy_log(struct super_block *sb) | |
1188 | { | |
1189 | int rc; | |
1190 | ||
353ab6e9 | 1191 | mutex_lock(&jfs_log_mutex); |
1da177e4 | 1192 | if (!dummy_log) { |
5b3030e3 | 1193 | dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
1da177e4 | 1194 | if (!dummy_log) { |
353ab6e9 | 1195 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1196 | return -ENOMEM; |
1197 | } | |
1da177e4 LT |
1198 | INIT_LIST_HEAD(&dummy_log->sb_list); |
1199 | init_waitqueue_head(&dummy_log->syncwait); | |
1200 | dummy_log->no_integrity = 1; | |
1201 | /* Make up some stuff */ | |
1202 | dummy_log->base = 0; | |
1203 | dummy_log->size = 1024; | |
1204 | rc = lmLogInit(dummy_log); | |
1205 | if (rc) { | |
1206 | kfree(dummy_log); | |
1207 | dummy_log = NULL; | |
353ab6e9 | 1208 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1209 | return rc; |
1210 | } | |
1211 | } | |
1212 | ||
1213 | LOG_LOCK(dummy_log); | |
1214 | list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); | |
1215 | JFS_SBI(sb)->log = dummy_log; | |
1216 | LOG_UNLOCK(dummy_log); | |
353ab6e9 | 1217 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1218 | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * NAME: lmLogInit() | |
1224 | * | |
1225 | * FUNCTION: log initialization at first log open. | |
1226 | * | |
1227 | * logredo() (or logformat()) should have been run previously. | |
1228 | * initialize the log from log superblock. | |
1229 | * set the log state in the superblock to LOGMOUNT and | |
1230 | * write SYNCPT log record. | |
63f83c9f | 1231 | * |
1da177e4 LT |
1232 | * PARAMETER: log - log structure |
1233 | * | |
1234 | * RETURN: 0 - if ok | |
1235 | * -EINVAL - bad log magic number or superblock dirty | |
1236 | * error returned from logwait() | |
63f83c9f | 1237 | * |
1da177e4 LT |
1238 | * serialization: single first open thread |
1239 | */ | |
1240 | int lmLogInit(struct jfs_log * log) | |
1241 | { | |
1242 | int rc = 0; | |
1243 | struct lrd lrd; | |
1244 | struct logsuper *logsuper; | |
1245 | struct lbuf *bpsuper; | |
1246 | struct lbuf *bp; | |
1247 | struct logpage *lp; | |
1248 | int lsn = 0; | |
1249 | ||
1250 | jfs_info("lmLogInit: log:0x%p", log); | |
1251 | ||
1252 | /* initialize the group commit serialization lock */ | |
1253 | LOGGC_LOCK_INIT(log); | |
1254 | ||
1255 | /* allocate/initialize the log write serialization lock */ | |
1256 | LOG_LOCK_INIT(log); | |
1257 | ||
1258 | LOGSYNC_LOCK_INIT(log); | |
1259 | ||
1260 | INIT_LIST_HEAD(&log->synclist); | |
1261 | ||
1262 | INIT_LIST_HEAD(&log->cqueue); | |
1263 | log->flush_tblk = NULL; | |
1264 | ||
1265 | log->count = 0; | |
1266 | ||
1267 | /* | |
1268 | * initialize log i/o | |
1269 | */ | |
1270 | if ((rc = lbmLogInit(log))) | |
1271 | return rc; | |
1272 | ||
1273 | if (!test_bit(log_INLINELOG, &log->flag)) | |
1274 | log->l2bsize = L2LOGPSIZE; | |
63f83c9f | 1275 | |
1da177e4 LT |
1276 | /* check for disabled journaling to disk */ |
1277 | if (log->no_integrity) { | |
1278 | /* | |
1279 | * Journal pages will still be filled. When the time comes | |
1280 | * to actually do the I/O, the write is not done, and the | |
1281 | * endio routine is called directly. | |
1282 | */ | |
1283 | bp = lbmAllocate(log , 0); | |
1284 | log->bp = bp; | |
1285 | bp->l_pn = bp->l_eor = 0; | |
1286 | } else { | |
1287 | /* | |
1288 | * validate log superblock | |
1289 | */ | |
1290 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1291 | goto errout10; | |
1292 | ||
1293 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1294 | ||
1295 | if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { | |
1296 | jfs_warn("*** Log Format Error ! ***"); | |
1297 | rc = -EINVAL; | |
1298 | goto errout20; | |
1299 | } | |
1300 | ||
1301 | /* logredo() should have been run successfully. */ | |
1302 | if (logsuper->state != cpu_to_le32(LOGREDONE)) { | |
1303 | jfs_warn("*** Log Is Dirty ! ***"); | |
1304 | rc = -EINVAL; | |
1305 | goto errout20; | |
1306 | } | |
1307 | ||
1308 | /* initialize log from log superblock */ | |
1309 | if (test_bit(log_INLINELOG,&log->flag)) { | |
1310 | if (log->size != le32_to_cpu(logsuper->size)) { | |
1311 | rc = -EINVAL; | |
1312 | goto errout20; | |
1313 | } | |
6ed71e98 JP |
1314 | jfs_info("lmLogInit: inline log:0x%p base:0x%Lx size:0x%x", |
1315 | log, (unsigned long long)log->base, log->size); | |
1da177e4 | 1316 | } else { |
2e3bc612 | 1317 | if (!uuid_equal(&logsuper->uuid, &log->uuid)) { |
1da177e4 | 1318 | jfs_warn("wrong uuid on JFS log device"); |
49210933 | 1319 | rc = -EINVAL; |
1da177e4 LT |
1320 | goto errout20; |
1321 | } | |
1322 | log->size = le32_to_cpu(logsuper->size); | |
1323 | log->l2bsize = le32_to_cpu(logsuper->l2bsize); | |
6ed71e98 JP |
1324 | jfs_info("lmLogInit: external log:0x%p base:0x%Lx size:0x%x", |
1325 | log, (unsigned long long)log->base, log->size); | |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; | |
1329 | log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); | |
1330 | ||
1331 | /* | |
1332 | * initialize for log append write mode | |
1333 | */ | |
1334 | /* establish current/end-of-log page/buffer */ | |
1335 | if ((rc = lbmRead(log, log->page, &bp))) | |
1336 | goto errout20; | |
1337 | ||
1338 | lp = (struct logpage *) bp->l_ldata; | |
1339 | ||
1340 | jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", | |
1341 | le32_to_cpu(logsuper->end), log->page, log->eor, | |
1342 | le16_to_cpu(lp->h.eor)); | |
1343 | ||
1344 | log->bp = bp; | |
1345 | bp->l_pn = log->page; | |
1346 | bp->l_eor = log->eor; | |
1347 | ||
1348 | /* if current page is full, move on to next page */ | |
1349 | if (log->eor >= LOGPSIZE - LOGPTLRSIZE) | |
1350 | lmNextPage(log); | |
1351 | ||
1352 | /* | |
1353 | * initialize log syncpoint | |
1354 | */ | |
1355 | /* | |
1356 | * write the first SYNCPT record with syncpoint = 0 | |
1357 | * (i.e., log redo up to HERE !); | |
1358 | * remove current page from lbm write queue at end of pageout | |
1359 | * (to write log superblock update), but do not release to | |
1360 | * freelist; | |
1361 | */ | |
1362 | lrd.logtid = 0; | |
1363 | lrd.backchain = 0; | |
1364 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1365 | lrd.length = 0; | |
1366 | lrd.log.syncpt.sync = 0; | |
1367 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); | |
1368 | bp = log->bp; | |
1369 | bp->l_ceor = bp->l_eor; | |
1370 | lp = (struct logpage *) bp->l_ldata; | |
1371 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1372 | lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); | |
1373 | if ((rc = lbmIOWait(bp, 0))) | |
1374 | goto errout30; | |
1375 | ||
1376 | /* | |
1377 | * update/write superblock | |
1378 | */ | |
1379 | logsuper->state = cpu_to_le32(LOGMOUNT); | |
1380 | log->serial = le32_to_cpu(logsuper->serial) + 1; | |
1381 | logsuper->serial = cpu_to_le32(log->serial); | |
1382 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1383 | if ((rc = lbmIOWait(bpsuper, lbmFREE))) | |
1384 | goto errout30; | |
1385 | } | |
1386 | ||
1387 | /* initialize logsync parameters */ | |
1388 | log->logsize = (log->size - 2) << L2LOGPSIZE; | |
1389 | log->lsn = lsn; | |
1390 | log->syncpt = lsn; | |
1391 | log->sync = log->syncpt; | |
1392 | log->nextsync = LOGSYNC_DELTA(log->logsize); | |
1393 | ||
1394 | jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", | |
1395 | log->lsn, log->syncpt, log->sync); | |
1396 | ||
1397 | /* | |
1398 | * initialize for lazy/group commit | |
1399 | */ | |
1400 | log->clsn = lsn; | |
1401 | ||
1402 | return 0; | |
1403 | ||
1404 | /* | |
f720e3ba | 1405 | * unwind on error |
1da177e4 LT |
1406 | */ |
1407 | errout30: /* release log page */ | |
1408 | log->wqueue = NULL; | |
1409 | bp->l_wqnext = NULL; | |
1410 | lbmFree(bp); | |
1411 | ||
1412 | errout20: /* release log superblock */ | |
1413 | lbmFree(bpsuper); | |
1414 | ||
1415 | errout10: /* unwind lbmLogInit() */ | |
1416 | lbmLogShutdown(log); | |
1417 | ||
1418 | jfs_warn("lmLogInit: exit(%d)", rc); | |
1419 | return rc; | |
1420 | } | |
1421 | ||
1422 | ||
1423 | /* | |
1424 | * NAME: lmLogClose() | |
1425 | * | |
1426 | * FUNCTION: remove file system <ipmnt> from active list of log <iplog> | |
1427 | * and close it on last close. | |
1428 | * | |
1429 | * PARAMETER: sb - superblock | |
1430 | * | |
1431 | * RETURN: errors from subroutines | |
1432 | * | |
1433 | * serialization: | |
1434 | */ | |
1435 | int lmLogClose(struct super_block *sb) | |
1436 | { | |
1437 | struct jfs_sb_info *sbi = JFS_SBI(sb); | |
1438 | struct jfs_log *log = sbi->log; | |
1439 | struct block_device *bdev; | |
1440 | int rc = 0; | |
1441 | ||
1442 | jfs_info("lmLogClose: log:0x%p", log); | |
1443 | ||
353ab6e9 | 1444 | mutex_lock(&jfs_log_mutex); |
1da177e4 LT |
1445 | LOG_LOCK(log); |
1446 | list_del(&sbi->log_list); | |
1447 | LOG_UNLOCK(log); | |
1448 | sbi->log = NULL; | |
1449 | ||
1450 | /* | |
1451 | * We need to make sure all of the "written" metapages | |
1452 | * actually make it to disk | |
1453 | */ | |
1454 | sync_blockdev(sb->s_bdev); | |
1455 | ||
1456 | if (test_bit(log_INLINELOG, &log->flag)) { | |
1457 | /* | |
f720e3ba | 1458 | * in-line log in host file system |
1da177e4 LT |
1459 | */ |
1460 | rc = lmLogShutdown(log); | |
1461 | kfree(log); | |
1462 | goto out; | |
1463 | } | |
1464 | ||
1465 | if (!log->no_integrity) | |
1466 | lmLogFileSystem(log, sbi, 0); | |
1467 | ||
1468 | if (!list_empty(&log->sb_list)) | |
1469 | goto out; | |
1470 | ||
1471 | /* | |
1472 | * TODO: ensure that the dummy_log is in a state to allow | |
1473 | * lbmLogShutdown to deallocate all the buffers and call | |
1474 | * kfree against dummy_log. For now, leave dummy_log & its | |
1475 | * buffers in memory, and resuse if another no-integrity mount | |
1476 | * is requested. | |
1477 | */ | |
1478 | if (log->no_integrity) | |
1479 | goto out; | |
1480 | ||
1481 | /* | |
f720e3ba | 1482 | * external log as separate logical volume |
1da177e4 LT |
1483 | */ |
1484 | list_del(&log->journal_list); | |
1485 | bdev = log->bdev; | |
1486 | rc = lmLogShutdown(log); | |
1487 | ||
e525fd89 | 1488 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1489 | |
1490 | kfree(log); | |
1491 | ||
1492 | out: | |
353ab6e9 | 1493 | mutex_unlock(&jfs_log_mutex); |
1da177e4 LT |
1494 | jfs_info("lmLogClose: exit(%d)", rc); |
1495 | return rc; | |
1496 | } | |
1497 | ||
1498 | ||
1499 | /* | |
1500 | * NAME: jfs_flush_journal() | |
1501 | * | |
1502 | * FUNCTION: initiate write of any outstanding transactions to the journal | |
1503 | * and optionally wait until they are all written to disk | |
1504 | * | |
1505 | * wait == 0 flush until latest txn is committed, don't wait | |
1506 | * wait == 1 flush until latest txn is committed, wait | |
1507 | * wait > 1 flush until all txn's are complete, wait | |
1508 | */ | |
1509 | void jfs_flush_journal(struct jfs_log *log, int wait) | |
1510 | { | |
1511 | int i; | |
1512 | struct tblock *target = NULL; | |
1513 | ||
1514 | /* jfs_write_inode may call us during read-only mount */ | |
1515 | if (!log) | |
1516 | return; | |
1517 | ||
1518 | jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); | |
1519 | ||
1520 | LOGGC_LOCK(log); | |
1521 | ||
1522 | if (!list_empty(&log->cqueue)) { | |
1523 | /* | |
1524 | * This ensures that we will keep writing to the journal as long | |
1525 | * as there are unwritten commit records | |
1526 | */ | |
1527 | target = list_entry(log->cqueue.prev, struct tblock, cqueue); | |
1528 | ||
1529 | if (test_bit(log_FLUSH, &log->flag)) { | |
1530 | /* | |
1531 | * We're already flushing. | |
1532 | * if flush_tblk is NULL, we are flushing everything, | |
1533 | * so leave it that way. Otherwise, update it to the | |
1534 | * latest transaction | |
1535 | */ | |
1536 | if (log->flush_tblk) | |
1537 | log->flush_tblk = target; | |
1538 | } else { | |
1539 | /* Only flush until latest transaction is committed */ | |
1540 | log->flush_tblk = target; | |
1541 | set_bit(log_FLUSH, &log->flag); | |
1542 | ||
1543 | /* | |
1544 | * Initiate I/O on outstanding transactions | |
1545 | */ | |
1546 | if (!(log->cflag & logGC_PAGEOUT)) { | |
1547 | log->cflag |= logGC_PAGEOUT; | |
1548 | lmGCwrite(log, 0); | |
1549 | } | |
1550 | } | |
1551 | } | |
1552 | if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { | |
1553 | /* Flush until all activity complete */ | |
1554 | set_bit(log_FLUSH, &log->flag); | |
1555 | log->flush_tblk = NULL; | |
1556 | } | |
1557 | ||
1558 | if (wait && target && !(target->flag & tblkGC_COMMITTED)) { | |
1559 | DECLARE_WAITQUEUE(__wait, current); | |
1560 | ||
1561 | add_wait_queue(&target->gcwait, &__wait); | |
1562 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1563 | LOGGC_UNLOCK(log); | |
1564 | schedule(); | |
1da177e4 LT |
1565 | LOGGC_LOCK(log); |
1566 | remove_wait_queue(&target->gcwait, &__wait); | |
1567 | } | |
1568 | LOGGC_UNLOCK(log); | |
1569 | ||
1570 | if (wait < 2) | |
1571 | return; | |
1572 | ||
67e6682f | 1573 | write_special_inodes(log, filemap_fdatawrite); |
7fab479b | 1574 | |
1da177e4 LT |
1575 | /* |
1576 | * If there was recent activity, we may need to wait | |
1577 | * for the lazycommit thread to catch up | |
1578 | */ | |
1579 | if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { | |
7fab479b | 1580 | for (i = 0; i < 200; i++) { /* Too much? */ |
1da177e4 | 1581 | msleep(250); |
67e6682f | 1582 | write_special_inodes(log, filemap_fdatawrite); |
1da177e4 LT |
1583 | if (list_empty(&log->cqueue) && |
1584 | list_empty(&log->synclist)) | |
1585 | break; | |
1586 | } | |
1587 | } | |
1588 | assert(list_empty(&log->cqueue)); | |
72e3148a DK |
1589 | |
1590 | #ifdef CONFIG_JFS_DEBUG | |
7fab479b DK |
1591 | if (!list_empty(&log->synclist)) { |
1592 | struct logsyncblk *lp; | |
1593 | ||
209e101b | 1594 | printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
7fab479b DK |
1595 | list_for_each_entry(lp, &log->synclist, synclist) { |
1596 | if (lp->xflag & COMMIT_PAGE) { | |
1597 | struct metapage *mp = (struct metapage *)lp; | |
288e4d83 DK |
1598 | print_hex_dump(KERN_ERR, "metapage: ", |
1599 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1600 | mp, sizeof(struct metapage), 0); | |
1601 | print_hex_dump(KERN_ERR, "page: ", | |
1602 | DUMP_PREFIX_ADDRESS, 16, | |
1603 | sizeof(long), mp->page, | |
1604 | sizeof(struct page), 0); | |
1605 | } else | |
1606 | print_hex_dump(KERN_ERR, "tblock:", | |
1607 | DUMP_PREFIX_ADDRESS, 16, 4, | |
1608 | lp, sizeof(struct tblock), 0); | |
7fab479b | 1609 | } |
7fab479b | 1610 | } |
288e4d83 DK |
1611 | #else |
1612 | WARN_ON(!list_empty(&log->synclist)); | |
72e3148a | 1613 | #endif |
1da177e4 LT |
1614 | clear_bit(log_FLUSH, &log->flag); |
1615 | } | |
1616 | ||
1617 | /* | |
1618 | * NAME: lmLogShutdown() | |
1619 | * | |
1620 | * FUNCTION: log shutdown at last LogClose(). | |
1621 | * | |
1622 | * write log syncpt record. | |
1623 | * update super block to set redone flag to 0. | |
1624 | * | |
1625 | * PARAMETER: log - log inode | |
1626 | * | |
1627 | * RETURN: 0 - success | |
63f83c9f | 1628 | * |
1da177e4 LT |
1629 | * serialization: single last close thread |
1630 | */ | |
1631 | int lmLogShutdown(struct jfs_log * log) | |
1632 | { | |
1633 | int rc; | |
1634 | struct lrd lrd; | |
1635 | int lsn; | |
1636 | struct logsuper *logsuper; | |
1637 | struct lbuf *bpsuper; | |
1638 | struct lbuf *bp; | |
1639 | struct logpage *lp; | |
1640 | ||
1641 | jfs_info("lmLogShutdown: log:0x%p", log); | |
1642 | ||
1643 | jfs_flush_journal(log, 2); | |
1644 | ||
1645 | /* | |
1646 | * write the last SYNCPT record with syncpoint = 0 | |
1647 | * (i.e., log redo up to HERE !) | |
1648 | */ | |
1649 | lrd.logtid = 0; | |
1650 | lrd.backchain = 0; | |
1651 | lrd.type = cpu_to_le16(LOG_SYNCPT); | |
1652 | lrd.length = 0; | |
1653 | lrd.log.syncpt.sync = 0; | |
63f83c9f | 1654 | |
1da177e4 LT |
1655 | lsn = lmWriteRecord(log, NULL, &lrd, NULL); |
1656 | bp = log->bp; | |
1657 | lp = (struct logpage *) bp->l_ldata; | |
1658 | lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); | |
1659 | lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); | |
1660 | lbmIOWait(log->bp, lbmFREE); | |
dc5798d9 | 1661 | log->bp = NULL; |
1da177e4 LT |
1662 | |
1663 | /* | |
1664 | * synchronous update log superblock | |
1665 | * mark log state as shutdown cleanly | |
1666 | * (i.e., Log does not need to be replayed). | |
1667 | */ | |
1668 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1669 | goto out; | |
1670 | ||
1671 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1672 | logsuper->state = cpu_to_le32(LOGREDONE); | |
1673 | logsuper->end = cpu_to_le32(lsn); | |
1674 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1675 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1676 | ||
1677 | jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", | |
1678 | lsn, log->page, log->eor); | |
1679 | ||
63f83c9f | 1680 | out: |
1da177e4 LT |
1681 | /* |
1682 | * shutdown per log i/o | |
1683 | */ | |
1684 | lbmLogShutdown(log); | |
1685 | ||
1686 | if (rc) { | |
1687 | jfs_warn("lmLogShutdown: exit(%d)", rc); | |
1688 | } | |
1689 | return rc; | |
1690 | } | |
1691 | ||
1692 | ||
1693 | /* | |
1694 | * NAME: lmLogFileSystem() | |
1695 | * | |
1696 | * FUNCTION: insert (<activate> = true)/remove (<activate> = false) | |
1697 | * file system into/from log active file system list. | |
1698 | * | |
1699 | * PARAMETE: log - pointer to logs inode. | |
1700 | * fsdev - kdev_t of filesystem. | |
f720e3ba | 1701 | * serial - pointer to returned log serial number |
1da177e4 LT |
1702 | * activate - insert/remove device from active list. |
1703 | * | |
1704 | * RETURN: 0 - success | |
1705 | * errors returned by vms_iowait(). | |
1706 | */ | |
1707 | static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, | |
1708 | int activate) | |
1709 | { | |
1710 | int rc = 0; | |
1711 | int i; | |
1712 | struct logsuper *logsuper; | |
1713 | struct lbuf *bpsuper; | |
2e3bc612 | 1714 | uuid_t *uuid = &sbi->uuid; |
1da177e4 LT |
1715 | |
1716 | /* | |
1717 | * insert/remove file system device to log active file system list. | |
1718 | */ | |
1719 | if ((rc = lbmRead(log, 1, &bpsuper))) | |
1720 | return rc; | |
1721 | ||
1722 | logsuper = (struct logsuper *) bpsuper->l_ldata; | |
1723 | if (activate) { | |
1724 | for (i = 0; i < MAX_ACTIVE; i++) | |
2e3bc612 AS |
1725 | if (uuid_is_null(&logsuper->active[i].uuid)) { |
1726 | uuid_copy(&logsuper->active[i].uuid, uuid); | |
1da177e4 LT |
1727 | sbi->aggregate = i; |
1728 | break; | |
1729 | } | |
1730 | if (i == MAX_ACTIVE) { | |
1731 | jfs_warn("Too many file systems sharing journal!"); | |
1732 | lbmFree(bpsuper); | |
1733 | return -EMFILE; /* Is there a better rc? */ | |
1734 | } | |
1735 | } else { | |
1736 | for (i = 0; i < MAX_ACTIVE; i++) | |
2e3bc612 AS |
1737 | if (uuid_equal(&logsuper->active[i].uuid, uuid)) { |
1738 | uuid_copy(&logsuper->active[i].uuid, | |
1739 | &uuid_null); | |
1da177e4 LT |
1740 | break; |
1741 | } | |
1742 | if (i == MAX_ACTIVE) { | |
1743 | jfs_warn("Somebody stomped on the journal!"); | |
1744 | lbmFree(bpsuper); | |
1745 | return -EIO; | |
1746 | } | |
63f83c9f | 1747 | |
1da177e4 LT |
1748 | } |
1749 | ||
1750 | /* | |
1751 | * synchronous write log superblock: | |
1752 | * | |
1753 | * write sidestream bypassing write queue: | |
1754 | * at file system mount, log super block is updated for | |
1755 | * activation of the file system before any log record | |
1756 | * (MOUNT record) of the file system, and at file system | |
1757 | * unmount, all meta data for the file system has been | |
1758 | * flushed before log super block is updated for deactivation | |
1759 | * of the file system. | |
1760 | */ | |
1761 | lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); | |
1762 | rc = lbmIOWait(bpsuper, lbmFREE); | |
1763 | ||
1764 | return rc; | |
1765 | } | |
1766 | ||
1767 | /* | |
1768 | * log buffer manager (lbm) | |
1769 | * ------------------------ | |
1770 | * | |
1771 | * special purpose buffer manager supporting log i/o requirements. | |
1772 | * | |
1773 | * per log write queue: | |
1774 | * log pageout occurs in serial order by fifo write queue and | |
1775 | * restricting to a single i/o in pregress at any one time. | |
1776 | * a circular singly-linked list | |
1777 | * (log->wrqueue points to the tail, and buffers are linked via | |
1778 | * bp->wrqueue field), and | |
1779 | * maintains log page in pageout ot waiting for pageout in serial pageout. | |
1780 | */ | |
1781 | ||
1782 | /* | |
1783 | * lbmLogInit() | |
1784 | * | |
1785 | * initialize per log I/O setup at lmLogInit() | |
1786 | */ | |
1787 | static int lbmLogInit(struct jfs_log * log) | |
1788 | { /* log inode */ | |
1789 | int i; | |
1790 | struct lbuf *lbuf; | |
1791 | ||
1792 | jfs_info("lbmLogInit: log:0x%p", log); | |
1793 | ||
1794 | /* initialize current buffer cursor */ | |
1795 | log->bp = NULL; | |
1796 | ||
1797 | /* initialize log device write queue */ | |
1798 | log->wqueue = NULL; | |
1799 | ||
1800 | /* | |
1801 | * Each log has its own buffer pages allocated to it. These are | |
1802 | * not managed by the page cache. This ensures that a transaction | |
1803 | * writing to the log does not block trying to allocate a page from | |
1804 | * the page cache (for the log). This would be bad, since page | |
1805 | * allocation waits on the kswapd thread that may be committing inodes | |
1806 | * which would cause log activity. Was that clear? I'm trying to | |
1807 | * avoid deadlock here. | |
1808 | */ | |
1809 | init_waitqueue_head(&log->free_wait); | |
1810 | ||
1811 | log->lbuf_free = NULL; | |
1812 | ||
dc5798d9 DK |
1813 | for (i = 0; i < LOGPAGES;) { |
1814 | char *buffer; | |
1815 | uint offset; | |
76e8d7cb | 1816 | struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
dc5798d9 | 1817 | |
76e8d7cb | 1818 | if (!page) |
1da177e4 | 1819 | goto error; |
76e8d7cb | 1820 | buffer = page_address(page); |
dc5798d9 DK |
1821 | for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { |
1822 | lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); | |
1823 | if (lbuf == NULL) { | |
1824 | if (offset == 0) | |
76e8d7cb | 1825 | __free_page(page); |
dc5798d9 DK |
1826 | goto error; |
1827 | } | |
1828 | if (offset) /* we already have one reference */ | |
1829 | get_page(page); | |
1830 | lbuf->l_offset = offset; | |
1831 | lbuf->l_ldata = buffer + offset; | |
1832 | lbuf->l_page = page; | |
1833 | lbuf->l_log = log; | |
1834 | init_waitqueue_head(&lbuf->l_ioevent); | |
1835 | ||
1836 | lbuf->l_freelist = log->lbuf_free; | |
1837 | log->lbuf_free = lbuf; | |
1838 | i++; | |
1da177e4 | 1839 | } |
1da177e4 LT |
1840 | } |
1841 | ||
1842 | return (0); | |
1843 | ||
1844 | error: | |
1845 | lbmLogShutdown(log); | |
1846 | return -ENOMEM; | |
1847 | } | |
1848 | ||
1849 | ||
1850 | /* | |
1851 | * lbmLogShutdown() | |
1852 | * | |
1853 | * finalize per log I/O setup at lmLogShutdown() | |
1854 | */ | |
1855 | static void lbmLogShutdown(struct jfs_log * log) | |
1856 | { | |
1857 | struct lbuf *lbuf; | |
1858 | ||
1859 | jfs_info("lbmLogShutdown: log:0x%p", log); | |
1860 | ||
1861 | lbuf = log->lbuf_free; | |
1862 | while (lbuf) { | |
1863 | struct lbuf *next = lbuf->l_freelist; | |
dc5798d9 | 1864 | __free_page(lbuf->l_page); |
1da177e4 LT |
1865 | kfree(lbuf); |
1866 | lbuf = next; | |
1867 | } | |
1da177e4 LT |
1868 | } |
1869 | ||
1870 | ||
1871 | /* | |
1872 | * lbmAllocate() | |
1873 | * | |
1874 | * allocate an empty log buffer | |
1875 | */ | |
1876 | static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) | |
1877 | { | |
1878 | struct lbuf *bp; | |
1879 | unsigned long flags; | |
1880 | ||
1881 | /* | |
1882 | * recycle from log buffer freelist if any | |
1883 | */ | |
1884 | LCACHE_LOCK(flags); | |
1885 | LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); | |
1886 | log->lbuf_free = bp->l_freelist; | |
1887 | LCACHE_UNLOCK(flags); | |
1888 | ||
1889 | bp->l_flag = 0; | |
1890 | ||
1891 | bp->l_wqnext = NULL; | |
1892 | bp->l_freelist = NULL; | |
1893 | ||
1894 | bp->l_pn = pn; | |
1895 | bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); | |
1896 | bp->l_ceor = 0; | |
1897 | ||
1898 | return bp; | |
1899 | } | |
1900 | ||
1901 | ||
1902 | /* | |
1903 | * lbmFree() | |
1904 | * | |
1905 | * release a log buffer to freelist | |
1906 | */ | |
1907 | static void lbmFree(struct lbuf * bp) | |
1908 | { | |
1909 | unsigned long flags; | |
1910 | ||
1911 | LCACHE_LOCK(flags); | |
1912 | ||
1913 | lbmfree(bp); | |
1914 | ||
1915 | LCACHE_UNLOCK(flags); | |
1916 | } | |
1917 | ||
1918 | static void lbmfree(struct lbuf * bp) | |
1919 | { | |
1920 | struct jfs_log *log = bp->l_log; | |
1921 | ||
1922 | assert(bp->l_wqnext == NULL); | |
1923 | ||
1924 | /* | |
1925 | * return the buffer to head of freelist | |
1926 | */ | |
1927 | bp->l_freelist = log->lbuf_free; | |
1928 | log->lbuf_free = bp; | |
1929 | ||
1930 | wake_up(&log->free_wait); | |
1931 | return; | |
1932 | } | |
1933 | ||
1934 | ||
1935 | /* | |
1936 | * NAME: lbmRedrive | |
1937 | * | |
59c51591 | 1938 | * FUNCTION: add a log buffer to the log redrive list |
1da177e4 LT |
1939 | * |
1940 | * PARAMETER: | |
f720e3ba | 1941 | * bp - log buffer |
1da177e4 LT |
1942 | * |
1943 | * NOTES: | |
1944 | * Takes log_redrive_lock. | |
1945 | */ | |
1946 | static inline void lbmRedrive(struct lbuf *bp) | |
1947 | { | |
1948 | unsigned long flags; | |
1949 | ||
1950 | spin_lock_irqsave(&log_redrive_lock, flags); | |
1951 | bp->l_redrive_next = log_redrive_list; | |
1952 | log_redrive_list = bp; | |
1953 | spin_unlock_irqrestore(&log_redrive_lock, flags); | |
1954 | ||
91dbb4de | 1955 | wake_up_process(jfsIOthread); |
1da177e4 LT |
1956 | } |
1957 | ||
1958 | ||
1959 | /* | |
1960 | * lbmRead() | |
1961 | */ | |
1962 | static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) | |
1963 | { | |
1964 | struct bio *bio; | |
1965 | struct lbuf *bp; | |
1966 | ||
1967 | /* | |
1968 | * allocate a log buffer | |
1969 | */ | |
1970 | *bpp = bp = lbmAllocate(log, pn); | |
1971 | jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); | |
1972 | ||
1973 | bp->l_flag |= lbmREAD; | |
1974 | ||
07888c66 | 1975 | bio = bio_alloc(log->bdev, 1, REQ_OP_READ, GFP_NOFS); |
4f024f37 | 1976 | bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
6cf66b4c KO |
1977 | bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
1978 | BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); | |
1da177e4 LT |
1979 | |
1980 | bio->bi_end_io = lbmIODone; | |
1981 | bio->bi_private = bp; | |
95bbb82f GZ |
1982 | /*check if journaling to disk has been disabled*/ |
1983 | if (log->no_integrity) { | |
4f024f37 | 1984 | bio->bi_iter.bi_size = 0; |
4246a0b6 | 1985 | lbmIODone(bio); |
95bbb82f | 1986 | } else { |
4e49ea4a | 1987 | submit_bio(bio); |
95bbb82f | 1988 | } |
1da177e4 LT |
1989 | |
1990 | wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); | |
1991 | ||
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | ||
1996 | /* | |
1997 | * lbmWrite() | |
1998 | * | |
1999 | * buffer at head of pageout queue stays after completion of | |
2000 | * partial-page pageout and redriven by explicit initiation of | |
2001 | * pageout by caller until full-page pageout is completed and | |
2002 | * released. | |
2003 | * | |
2004 | * device driver i/o done redrives pageout of new buffer at | |
2005 | * head of pageout queue when current buffer at head of pageout | |
2006 | * queue is released at the completion of its full-page pageout. | |
2007 | * | |
2008 | * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). | |
2009 | * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() | |
2010 | */ | |
2011 | static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, | |
2012 | int cant_block) | |
2013 | { | |
2014 | struct lbuf *tail; | |
2015 | unsigned long flags; | |
2016 | ||
2017 | jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); | |
2018 | ||
2019 | /* map the logical block address to physical block address */ | |
2020 | bp->l_blkno = | |
2021 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2022 | ||
2023 | LCACHE_LOCK(flags); /* disable+lock */ | |
2024 | ||
2025 | /* | |
2026 | * initialize buffer for device driver | |
2027 | */ | |
2028 | bp->l_flag = flag; | |
2029 | ||
2030 | /* | |
f720e3ba | 2031 | * insert bp at tail of write queue associated with log |
1da177e4 LT |
2032 | * |
2033 | * (request is either for bp already/currently at head of queue | |
2034 | * or new bp to be inserted at tail) | |
2035 | */ | |
2036 | tail = log->wqueue; | |
2037 | ||
2038 | /* is buffer not already on write queue ? */ | |
2039 | if (bp->l_wqnext == NULL) { | |
2040 | /* insert at tail of wqueue */ | |
2041 | if (tail == NULL) { | |
2042 | log->wqueue = bp; | |
2043 | bp->l_wqnext = bp; | |
2044 | } else { | |
2045 | log->wqueue = bp; | |
2046 | bp->l_wqnext = tail->l_wqnext; | |
2047 | tail->l_wqnext = bp; | |
2048 | } | |
2049 | ||
2050 | tail = bp; | |
2051 | } | |
2052 | ||
2053 | /* is buffer at head of wqueue and for write ? */ | |
2054 | if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { | |
2055 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2056 | return; | |
2057 | } | |
2058 | ||
2059 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2060 | ||
2061 | if (cant_block) | |
2062 | lbmRedrive(bp); | |
2063 | else if (flag & lbmSYNC) | |
2064 | lbmStartIO(bp); | |
2065 | else { | |
2066 | LOGGC_UNLOCK(log); | |
2067 | lbmStartIO(bp); | |
2068 | LOGGC_LOCK(log); | |
2069 | } | |
2070 | } | |
2071 | ||
2072 | ||
2073 | /* | |
2074 | * lbmDirectWrite() | |
2075 | * | |
2076 | * initiate pageout bypassing write queue for sidestream | |
2077 | * (e.g., log superblock) write; | |
2078 | */ | |
2079 | static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) | |
2080 | { | |
2081 | jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", | |
2082 | bp, flag, bp->l_pn); | |
2083 | ||
2084 | /* | |
2085 | * initialize buffer for device driver | |
2086 | */ | |
2087 | bp->l_flag = flag | lbmDIRECT; | |
2088 | ||
2089 | /* map the logical block address to physical block address */ | |
2090 | bp->l_blkno = | |
2091 | log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); | |
2092 | ||
2093 | /* | |
f720e3ba | 2094 | * initiate pageout of the page |
1da177e4 LT |
2095 | */ |
2096 | lbmStartIO(bp); | |
2097 | } | |
2098 | ||
2099 | ||
2100 | /* | |
2101 | * NAME: lbmStartIO() | |
2102 | * | |
2103 | * FUNCTION: Interface to DD strategy routine | |
2104 | * | |
f720e3ba | 2105 | * RETURN: none |
1da177e4 LT |
2106 | * |
2107 | * serialization: LCACHE_LOCK() is NOT held during log i/o; | |
2108 | */ | |
2109 | static void lbmStartIO(struct lbuf * bp) | |
2110 | { | |
2111 | struct bio *bio; | |
2112 | struct jfs_log *log = bp->l_log; | |
2113 | ||
b18db6de | 2114 | jfs_info("lbmStartIO"); |
1da177e4 | 2115 | |
07888c66 | 2116 | bio = bio_alloc(log->bdev, 1, REQ_OP_WRITE | REQ_SYNC, GFP_NOFS); |
4f024f37 | 2117 | bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
6cf66b4c KO |
2118 | bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
2119 | BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); | |
1da177e4 LT |
2120 | |
2121 | bio->bi_end_io = lbmIODone; | |
2122 | bio->bi_private = bp; | |
2123 | ||
2124 | /* check if journaling to disk has been disabled */ | |
dc5798d9 | 2125 | if (log->no_integrity) { |
4f024f37 | 2126 | bio->bi_iter.bi_size = 0; |
4246a0b6 | 2127 | lbmIODone(bio); |
dc5798d9 | 2128 | } else { |
4e49ea4a | 2129 | submit_bio(bio); |
1da177e4 LT |
2130 | INCREMENT(lmStat.submitted); |
2131 | } | |
1da177e4 LT |
2132 | } |
2133 | ||
2134 | ||
2135 | /* | |
2136 | * lbmIOWait() | |
2137 | */ | |
2138 | static int lbmIOWait(struct lbuf * bp, int flag) | |
2139 | { | |
2140 | unsigned long flags; | |
2141 | int rc = 0; | |
2142 | ||
2143 | jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2144 | ||
2145 | LCACHE_LOCK(flags); /* disable+lock */ | |
2146 | ||
2147 | LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); | |
2148 | ||
2149 | rc = (bp->l_flag & lbmERROR) ? -EIO : 0; | |
2150 | ||
2151 | if (flag & lbmFREE) | |
2152 | lbmfree(bp); | |
2153 | ||
2154 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2155 | ||
2156 | jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); | |
2157 | return rc; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * lbmIODone() | |
2162 | * | |
2163 | * executed at INTIODONE level | |
2164 | */ | |
4246a0b6 | 2165 | static void lbmIODone(struct bio *bio) |
1da177e4 LT |
2166 | { |
2167 | struct lbuf *bp = bio->bi_private; | |
2168 | struct lbuf *nextbp, *tail; | |
2169 | struct jfs_log *log; | |
2170 | unsigned long flags; | |
2171 | ||
1da177e4 LT |
2172 | /* |
2173 | * get back jfs buffer bound to the i/o buffer | |
2174 | */ | |
2175 | jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); | |
2176 | ||
2177 | LCACHE_LOCK(flags); /* disable+lock */ | |
2178 | ||
2179 | bp->l_flag |= lbmDONE; | |
2180 | ||
4e4cbee9 | 2181 | if (bio->bi_status) { |
1da177e4 LT |
2182 | bp->l_flag |= lbmERROR; |
2183 | ||
2184 | jfs_err("lbmIODone: I/O error in JFS log"); | |
2185 | } | |
2186 | ||
2187 | bio_put(bio); | |
2188 | ||
2189 | /* | |
f720e3ba | 2190 | * pagein completion |
1da177e4 LT |
2191 | */ |
2192 | if (bp->l_flag & lbmREAD) { | |
2193 | bp->l_flag &= ~lbmREAD; | |
2194 | ||
2195 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2196 | ||
2197 | /* wakeup I/O initiator */ | |
2198 | LCACHE_WAKEUP(&bp->l_ioevent); | |
8d8fe642 DK |
2199 | |
2200 | return; | |
1da177e4 LT |
2201 | } |
2202 | ||
2203 | /* | |
f720e3ba | 2204 | * pageout completion |
1da177e4 LT |
2205 | * |
2206 | * the bp at the head of write queue has completed pageout. | |
2207 | * | |
2208 | * if single-commit/full-page pageout, remove the current buffer | |
2209 | * from head of pageout queue, and redrive pageout with | |
2210 | * the new buffer at head of pageout queue; | |
2211 | * otherwise, the partial-page pageout buffer stays at | |
2212 | * the head of pageout queue to be redriven for pageout | |
2213 | * by lmGroupCommit() until full-page pageout is completed. | |
2214 | */ | |
2215 | bp->l_flag &= ~lbmWRITE; | |
2216 | INCREMENT(lmStat.pagedone); | |
2217 | ||
2218 | /* update committed lsn */ | |
2219 | log = bp->l_log; | |
2220 | log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; | |
2221 | ||
2222 | if (bp->l_flag & lbmDIRECT) { | |
2223 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2224 | LCACHE_UNLOCK(flags); | |
8d8fe642 | 2225 | return; |
1da177e4 LT |
2226 | } |
2227 | ||
2228 | tail = log->wqueue; | |
2229 | ||
2230 | /* single element queue */ | |
2231 | if (bp == tail) { | |
2232 | /* remove head buffer of full-page pageout | |
2233 | * from log device write queue | |
2234 | */ | |
2235 | if (bp->l_flag & lbmRELEASE) { | |
2236 | log->wqueue = NULL; | |
2237 | bp->l_wqnext = NULL; | |
2238 | } | |
2239 | } | |
2240 | /* multi element queue */ | |
2241 | else { | |
2242 | /* remove head buffer of full-page pageout | |
2243 | * from log device write queue | |
2244 | */ | |
2245 | if (bp->l_flag & lbmRELEASE) { | |
2246 | nextbp = tail->l_wqnext = bp->l_wqnext; | |
2247 | bp->l_wqnext = NULL; | |
2248 | ||
2249 | /* | |
2250 | * redrive pageout of next page at head of write queue: | |
2251 | * redrive next page without any bound tblk | |
2252 | * (i.e., page w/o any COMMIT records), or | |
2253 | * first page of new group commit which has been | |
2254 | * queued after current page (subsequent pageout | |
2255 | * is performed synchronously, except page without | |
2256 | * any COMMITs) by lmGroupCommit() as indicated | |
2257 | * by lbmWRITE flag; | |
2258 | */ | |
2259 | if (nextbp->l_flag & lbmWRITE) { | |
2260 | /* | |
2261 | * We can't do the I/O at interrupt time. | |
2262 | * The jfsIO thread can do it | |
2263 | */ | |
2264 | lbmRedrive(nextbp); | |
2265 | } | |
2266 | } | |
2267 | } | |
2268 | ||
2269 | /* | |
f720e3ba | 2270 | * synchronous pageout: |
1da177e4 LT |
2271 | * |
2272 | * buffer has not necessarily been removed from write queue | |
2273 | * (e.g., synchronous write of partial-page with COMMIT): | |
2274 | * leave buffer for i/o initiator to dispose | |
2275 | */ | |
2276 | if (bp->l_flag & lbmSYNC) { | |
2277 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2278 | ||
2279 | /* wakeup I/O initiator */ | |
2280 | LCACHE_WAKEUP(&bp->l_ioevent); | |
2281 | } | |
2282 | ||
2283 | /* | |
f720e3ba | 2284 | * Group Commit pageout: |
1da177e4 LT |
2285 | */ |
2286 | else if (bp->l_flag & lbmGC) { | |
2287 | LCACHE_UNLOCK(flags); | |
2288 | lmPostGC(bp); | |
2289 | } | |
2290 | ||
2291 | /* | |
f720e3ba | 2292 | * asynchronous pageout: |
1da177e4 LT |
2293 | * |
2294 | * buffer must have been removed from write queue: | |
2295 | * insert buffer at head of freelist where it can be recycled | |
2296 | */ | |
2297 | else { | |
2298 | assert(bp->l_flag & lbmRELEASE); | |
2299 | assert(bp->l_flag & lbmFREE); | |
2300 | lbmfree(bp); | |
2301 | ||
2302 | LCACHE_UNLOCK(flags); /* unlock+enable */ | |
2303 | } | |
1da177e4 LT |
2304 | } |
2305 | ||
2306 | int jfsIOWait(void *arg) | |
2307 | { | |
2308 | struct lbuf *bp; | |
2309 | ||
1da177e4 | 2310 | do { |
1da177e4 | 2311 | spin_lock_irq(&log_redrive_lock); |
09aaa749 | 2312 | while ((bp = log_redrive_list)) { |
1da177e4 LT |
2313 | log_redrive_list = bp->l_redrive_next; |
2314 | bp->l_redrive_next = NULL; | |
2315 | spin_unlock_irq(&log_redrive_lock); | |
2316 | lbmStartIO(bp); | |
2317 | spin_lock_irq(&log_redrive_lock); | |
2318 | } | |
91dbb4de | 2319 | |
3e1d1d28 | 2320 | if (freezing(current)) { |
05ec9e26 | 2321 | spin_unlock_irq(&log_redrive_lock); |
a0acae0e | 2322 | try_to_freeze(); |
1da177e4 | 2323 | } else { |
1da177e4 | 2324 | set_current_state(TASK_INTERRUPTIBLE); |
05ec9e26 | 2325 | spin_unlock_irq(&log_redrive_lock); |
1da177e4 | 2326 | schedule(); |
1da177e4 | 2327 | } |
91dbb4de | 2328 | } while (!kthread_should_stop()); |
1da177e4 LT |
2329 | |
2330 | jfs_info("jfsIOWait being killed!"); | |
91dbb4de | 2331 | return 0; |
1da177e4 LT |
2332 | } |
2333 | ||
2334 | /* | |
2335 | * NAME: lmLogFormat()/jfs_logform() | |
2336 | * | |
2337 | * FUNCTION: format file system log | |
2338 | * | |
2339 | * PARAMETERS: | |
f720e3ba | 2340 | * log - volume log |
1da177e4 LT |
2341 | * logAddress - start address of log space in FS block |
2342 | * logSize - length of log space in FS block; | |
2343 | * | |
2344 | * RETURN: 0 - success | |
2345 | * -EIO - i/o error | |
2346 | * | |
2347 | * XXX: We're synchronously writing one page at a time. This needs to | |
2348 | * be improved by writing multiple pages at once. | |
2349 | */ | |
2350 | int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) | |
2351 | { | |
2352 | int rc = -EIO; | |
2353 | struct jfs_sb_info *sbi; | |
2354 | struct logsuper *logsuper; | |
2355 | struct logpage *lp; | |
2356 | int lspn; /* log sequence page number */ | |
2357 | struct lrd *lrd_ptr; | |
2358 | int npages = 0; | |
2359 | struct lbuf *bp; | |
2360 | ||
2361 | jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", | |
2362 | (long long)logAddress, logSize); | |
2363 | ||
2364 | sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); | |
2365 | ||
2366 | /* allocate a log buffer */ | |
2367 | bp = lbmAllocate(log, 1); | |
2368 | ||
2369 | npages = logSize >> sbi->l2nbperpage; | |
2370 | ||
2371 | /* | |
f720e3ba | 2372 | * log space: |
1da177e4 LT |
2373 | * |
2374 | * page 0 - reserved; | |
2375 | * page 1 - log superblock; | |
2376 | * page 2 - log data page: A SYNC log record is written | |
f720e3ba | 2377 | * into this page at logform time; |
1da177e4 LT |
2378 | * pages 3-N - log data page: set to empty log data pages; |
2379 | */ | |
2380 | /* | |
f720e3ba | 2381 | * init log superblock: log page 1 |
1da177e4 LT |
2382 | */ |
2383 | logsuper = (struct logsuper *) bp->l_ldata; | |
2384 | ||
2385 | logsuper->magic = cpu_to_le32(LOGMAGIC); | |
2386 | logsuper->version = cpu_to_le32(LOGVERSION); | |
2387 | logsuper->state = cpu_to_le32(LOGREDONE); | |
2388 | logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ | |
2389 | logsuper->size = cpu_to_le32(npages); | |
2390 | logsuper->bsize = cpu_to_le32(sbi->bsize); | |
2391 | logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); | |
2392 | logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); | |
2393 | ||
2394 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2395 | bp->l_blkno = logAddress + sbi->nbperpage; | |
2396 | lbmStartIO(bp); | |
2397 | if ((rc = lbmIOWait(bp, 0))) | |
2398 | goto exit; | |
2399 | ||
2400 | /* | |
f720e3ba | 2401 | * init pages 2 to npages-1 as log data pages: |
1da177e4 LT |
2402 | * |
2403 | * log page sequence number (lpsn) initialization: | |
2404 | * | |
2405 | * pn: 0 1 2 3 n-1 | |
2406 | * +-----+-----+=====+=====+===.....===+=====+ | |
2407 | * lspn: N-1 0 1 N-2 | |
2408 | * <--- N page circular file ----> | |
2409 | * | |
2410 | * the N (= npages-2) data pages of the log is maintained as | |
2411 | * a circular file for the log records; | |
2412 | * lpsn grows by 1 monotonically as each log page is written | |
2413 | * to the circular file of the log; | |
2414 | * and setLogpage() will not reset the page number even if | |
2415 | * the eor is equal to LOGPHDRSIZE. In order for binary search | |
2416 | * still work in find log end process, we have to simulate the | |
2417 | * log wrap situation at the log format time. | |
2418 | * The 1st log page written will have the highest lpsn. Then | |
2419 | * the succeeding log pages will have ascending order of | |
2420 | * the lspn starting from 0, ... (N-2) | |
2421 | */ | |
2422 | lp = (struct logpage *) bp->l_ldata; | |
2423 | /* | |
2424 | * initialize 1st log page to be written: lpsn = N - 1, | |
2425 | * write a SYNCPT log record is written to this page | |
2426 | */ | |
2427 | lp->h.page = lp->t.page = cpu_to_le32(npages - 3); | |
2428 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); | |
2429 | ||
2430 | lrd_ptr = (struct lrd *) &lp->data; | |
2431 | lrd_ptr->logtid = 0; | |
2432 | lrd_ptr->backchain = 0; | |
2433 | lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); | |
2434 | lrd_ptr->length = 0; | |
2435 | lrd_ptr->log.syncpt.sync = 0; | |
2436 | ||
2437 | bp->l_blkno += sbi->nbperpage; | |
2438 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2439 | lbmStartIO(bp); | |
2440 | if ((rc = lbmIOWait(bp, 0))) | |
2441 | goto exit; | |
2442 | ||
2443 | /* | |
f720e3ba | 2444 | * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) |
1da177e4 LT |
2445 | */ |
2446 | for (lspn = 0; lspn < npages - 3; lspn++) { | |
2447 | lp->h.page = lp->t.page = cpu_to_le32(lspn); | |
2448 | lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); | |
2449 | ||
2450 | bp->l_blkno += sbi->nbperpage; | |
2451 | bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; | |
2452 | lbmStartIO(bp); | |
2453 | if ((rc = lbmIOWait(bp, 0))) | |
2454 | goto exit; | |
2455 | } | |
2456 | ||
2457 | rc = 0; | |
2458 | exit: | |
2459 | /* | |
f720e3ba | 2460 | * finalize log |
1da177e4 LT |
2461 | */ |
2462 | /* release the buffer */ | |
2463 | lbmFree(bp); | |
2464 | ||
2465 | return rc; | |
2466 | } | |
2467 | ||
2468 | #ifdef CONFIG_JFS_STATISTICS | |
07a3b8ed | 2469 | int jfs_lmstats_proc_show(struct seq_file *m, void *v) |
1da177e4 | 2470 | { |
b2e03ca7 | 2471 | seq_printf(m, |
1da177e4 LT |
2472 | "JFS Logmgr stats\n" |
2473 | "================\n" | |
2474 | "commits = %d\n" | |
2475 | "writes submitted = %d\n" | |
2476 | "writes completed = %d\n" | |
2477 | "full pages submitted = %d\n" | |
2478 | "partial pages submitted = %d\n", | |
2479 | lmStat.commit, | |
2480 | lmStat.submitted, | |
2481 | lmStat.pagedone, | |
2482 | lmStat.full_page, | |
2483 | lmStat.partial_page); | |
b2e03ca7 AD |
2484 | return 0; |
2485 | } | |
1da177e4 | 2486 | #endif /* CONFIG_JFS_STATISTICS */ |