1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 /* 21 * jfs_logmgr.c: log manager 22 * 23 * for related information, see transaction manager (jfs_txnmgr.c), and 24 * recovery manager (jfs_logredo.c). 25 * 26 * note: for detail, RTFS. 27 * 28 * log buffer manager: 29 * special purpose buffer manager supporting log i/o requirements. 30 * per log serial pageout of logpage 31 * queuing i/o requests and redrive i/o at iodone 32 * maintain current logpage buffer 33 * no caching since append only 34 * appropriate jfs buffer cache buffers as needed 35 * 36 * group commit: 37 * transactions which wrote COMMIT records in the same in-memory 38 * log page during the pageout of previous/current log page(s) are 39 * committed together by the pageout of the page. 40 * 41 * TBD lazy commit: 42 * transactions are committed asynchronously when the log page 43 * containing it COMMIT is paged out when it becomes full; 44 * 45 * serialization: 46 * . a per log lock serialize log write. 47 * . a per log lock serialize group commit. 48 * . a per log lock serialize log open/close; 49 * 50 * TBD log integrity: 51 * careful-write (ping-pong) of last logpage to recover from crash 52 * in overwrite. 53 * detection of split (out-of-order) write of physical sectors 54 * of last logpage via timestamp at end of each sector 55 * with its mirror data array at trailer). 56 * 57 * alternatives: 58 * lsn - 64-bit monotonically increasing integer vs 59 * 32-bit lspn and page eor. 60 */ 61 62 #include <linux/fs.h> 63 #include <linux/blkdev.h> 64 #include <linux/interrupt.h> 65 #include <linux/completion.h> 66 #include <linux/kthread.h> 67 #include <linux/buffer_head.h> /* for sync_blockdev() */ 68 #include <linux/bio.h> 69 #include <linux/freezer.h> 70 #include <linux/delay.h> 71 #include <linux/mutex.h> 72 #include <linux/seq_file.h> 73 #include <linux/slab.h> 74 #include "jfs_incore.h" 75 #include "jfs_filsys.h" 76 #include "jfs_metapage.h" 77 #include "jfs_superblock.h" 78 #include "jfs_txnmgr.h" 79 #include "jfs_debug.h" 80 81 82 /* 83 * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) 84 */ 85 static struct lbuf *log_redrive_list; 86 static DEFINE_SPINLOCK(log_redrive_lock); 87 88 89 /* 90 * log read/write serialization (per log) 91 */ 92 #define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) 93 #define LOG_LOCK(log) mutex_lock(&((log)->loglock)) 94 #define LOG_UNLOCK(log) mutex_unlock(&((log)->loglock)) 95 96 97 /* 98 * log group commit serialization (per log) 99 */ 100 101 #define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) 102 #define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) 103 #define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) 104 #define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) 105 106 /* 107 * log sync serialization (per log) 108 */ 109 #define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) 110 #define LOGSYNC_BARRIER(logsize) ((logsize)/4) 111 /* 112 #define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) 113 #define LOGSYNC_BARRIER(logsize) ((logsize)/2) 114 */ 115 116 117 /* 118 * log buffer cache synchronization 119 */ 120 static DEFINE_SPINLOCK(jfsLCacheLock); 121 122 #define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) 123 #define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) 124 125 /* 126 * See __SLEEP_COND in jfs_locks.h 127 */ 128 #define LCACHE_SLEEP_COND(wq, cond, flags) \ 129 do { \ 130 if (cond) \ 131 break; \ 132 __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ 133 } while (0) 134 135 #define LCACHE_WAKEUP(event) wake_up(event) 136 137 138 /* 139 * lbuf buffer cache (lCache) control 140 */ 141 /* log buffer manager pageout control (cumulative, inclusive) */ 142 #define lbmREAD 0x0001 143 #define lbmWRITE 0x0002 /* enqueue at tail of write queue; 144 * init pageout if at head of queue; 145 */ 146 #define lbmRELEASE 0x0004 /* remove from write queue 147 * at completion of pageout; 148 * do not free/recycle it yet: 149 * caller will free it; 150 */ 151 #define lbmSYNC 0x0008 /* do not return to freelist 152 * when removed from write queue; 153 */ 154 #define lbmFREE 0x0010 /* return to freelist 155 * at completion of pageout; 156 * the buffer may be recycled; 157 */ 158 #define lbmDONE 0x0020 159 #define lbmERROR 0x0040 160 #define lbmGC 0x0080 /* lbmIODone to perform post-GC processing 161 * of log page 162 */ 163 #define lbmDIRECT 0x0100 164 165 /* 166 * Global list of active external journals 167 */ 168 static LIST_HEAD(jfs_external_logs); 169 static struct jfs_log *dummy_log = NULL; 170 static DEFINE_MUTEX(jfs_log_mutex); 171 172 /* 173 * forward references 174 */ 175 static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, 176 struct lrd * lrd, struct tlock * tlck); 177 178 static int lmNextPage(struct jfs_log * log); 179 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, 180 int activate); 181 182 static int open_inline_log(struct super_block *sb); 183 static int open_dummy_log(struct super_block *sb); 184 static int lbmLogInit(struct jfs_log * log); 185 static void lbmLogShutdown(struct jfs_log * log); 186 static struct lbuf *lbmAllocate(struct jfs_log * log, int); 187 static void lbmFree(struct lbuf * bp); 188 static void lbmfree(struct lbuf * bp); 189 static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); 190 static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); 191 static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); 192 static int lbmIOWait(struct lbuf * bp, int flag); 193 static bio_end_io_t lbmIODone; 194 static void lbmStartIO(struct lbuf * bp); 195 static void lmGCwrite(struct jfs_log * log, int cant_block); 196 static int lmLogSync(struct jfs_log * log, int hard_sync); 197 198 199 200 /* 201 * statistics 202 */ 203 #ifdef CONFIG_JFS_STATISTICS 204 static struct lmStat { 205 uint commit; /* # of commit */ 206 uint pagedone; /* # of page written */ 207 uint submitted; /* # of pages submitted */ 208 uint full_page; /* # of full pages submitted */ 209 uint partial_page; /* # of partial pages submitted */ 210 } lmStat; 211 #endif 212 213 static void write_special_inodes(struct jfs_log *log, 214 int (*writer)(struct address_space *)) 215 { 216 struct jfs_sb_info *sbi; 217 218 list_for_each_entry(sbi, &log->sb_list, log_list) { 219 writer(sbi->ipbmap->i_mapping); 220 writer(sbi->ipimap->i_mapping); 221 writer(sbi->direct_inode->i_mapping); 222 } 223 } 224 225 /* 226 * NAME: lmLog() 227 * 228 * FUNCTION: write a log record; 229 * 230 * PARAMETER: 231 * 232 * RETURN: lsn - offset to the next log record to write (end-of-log); 233 * -1 - error; 234 * 235 * note: todo: log error handler 236 */ 237 int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, 238 struct tlock * tlck) 239 { 240 int lsn; 241 int diffp, difft; 242 struct metapage *mp = NULL; 243 unsigned long flags; 244 245 jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", 246 log, tblk, lrd, tlck); 247 248 LOG_LOCK(log); 249 250 /* log by (out-of-transaction) JFS ? */ 251 if (tblk == NULL) 252 goto writeRecord; 253 254 /* log from page ? */ 255 if (tlck == NULL || 256 tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) 257 goto writeRecord; 258 259 /* 260 * initialize/update page/transaction recovery lsn 261 */ 262 lsn = log->lsn; 263 264 LOGSYNC_LOCK(log, flags); 265 266 /* 267 * initialize page lsn if first log write of the page 268 */ 269 if (mp->lsn == 0) { 270 mp->log = log; 271 mp->lsn = lsn; 272 log->count++; 273 274 /* insert page at tail of logsynclist */ 275 list_add_tail(&mp->synclist, &log->synclist); 276 } 277 278 /* 279 * initialize/update lsn of tblock of the page 280 * 281 * transaction inherits oldest lsn of pages associated 282 * with allocation/deallocation of resources (their 283 * log records are used to reconstruct allocation map 284 * at recovery time: inode for inode allocation map, 285 * B+-tree index of extent descriptors for block 286 * allocation map); 287 * allocation map pages inherit transaction lsn at 288 * commit time to allow forwarding log syncpt past log 289 * records associated with allocation/deallocation of 290 * resources only after persistent map of these map pages 291 * have been updated and propagated to home. 292 */ 293 /* 294 * initialize transaction lsn: 295 */ 296 if (tblk->lsn == 0) { 297 /* inherit lsn of its first page logged */ 298 tblk->lsn = mp->lsn; 299 log->count++; 300 301 /* insert tblock after the page on logsynclist */ 302 list_add(&tblk->synclist, &mp->synclist); 303 } 304 /* 305 * update transaction lsn: 306 */ 307 else { 308 /* inherit oldest/smallest lsn of page */ 309 logdiff(diffp, mp->lsn, log); 310 logdiff(difft, tblk->lsn, log); 311 if (diffp < difft) { 312 /* update tblock lsn with page lsn */ 313 tblk->lsn = mp->lsn; 314 315 /* move tblock after page on logsynclist */ 316 list_move(&tblk->synclist, &mp->synclist); 317 } 318 } 319 320 LOGSYNC_UNLOCK(log, flags); 321 322 /* 323 * write the log record 324 */ 325 writeRecord: 326 lsn = lmWriteRecord(log, tblk, lrd, tlck); 327 328 /* 329 * forward log syncpt if log reached next syncpt trigger 330 */ 331 logdiff(diffp, lsn, log); 332 if (diffp >= log->nextsync) 333 lsn = lmLogSync(log, 0); 334 335 /* update end-of-log lsn */ 336 log->lsn = lsn; 337 338 LOG_UNLOCK(log); 339 340 /* return end-of-log address */ 341 return lsn; 342 } 343 344 /* 345 * NAME: lmWriteRecord() 346 * 347 * FUNCTION: move the log record to current log page 348 * 349 * PARAMETER: cd - commit descriptor 350 * 351 * RETURN: end-of-log address 352 * 353 * serialization: LOG_LOCK() held on entry/exit 354 */ 355 static int 356 lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, 357 struct tlock * tlck) 358 { 359 int lsn = 0; /* end-of-log address */ 360 struct lbuf *bp; /* dst log page buffer */ 361 struct logpage *lp; /* dst log page */ 362 caddr_t dst; /* destination address in log page */ 363 int dstoffset; /* end-of-log offset in log page */ 364 int freespace; /* free space in log page */ 365 caddr_t p; /* src meta-data page */ 366 caddr_t src; 367 int srclen; 368 int nbytes; /* number of bytes to move */ 369 int i; 370 int len; 371 struct linelock *linelock; 372 struct lv *lv; 373 struct lvd *lvd; 374 int l2linesize; 375 376 len = 0; 377 378 /* retrieve destination log page to write */ 379 bp = (struct lbuf *) log->bp; 380 lp = (struct logpage *) bp->l_ldata; 381 dstoffset = log->eor; 382 383 /* any log data to write ? */ 384 if (tlck == NULL) 385 goto moveLrd; 386 387 /* 388 * move log record data 389 */ 390 /* retrieve source meta-data page to log */ 391 if (tlck->flag & tlckPAGELOCK) { 392 p = (caddr_t) (tlck->mp->data); 393 linelock = (struct linelock *) & tlck->lock; 394 } 395 /* retrieve source in-memory inode to log */ 396 else if (tlck->flag & tlckINODELOCK) { 397 if (tlck->type & tlckDTREE) 398 p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; 399 else 400 p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; 401 linelock = (struct linelock *) & tlck->lock; 402 } 403 #ifdef _JFS_WIP 404 else if (tlck->flag & tlckINLINELOCK) { 405 406 inlinelock = (struct inlinelock *) & tlck; 407 p = (caddr_t) & inlinelock->pxd; 408 linelock = (struct linelock *) & tlck; 409 } 410 #endif /* _JFS_WIP */ 411 else { 412 jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); 413 return 0; /* Probably should trap */ 414 } 415 l2linesize = linelock->l2linesize; 416 417 moveData: 418 ASSERT(linelock->index <= linelock->maxcnt); 419 420 lv = linelock->lv; 421 for (i = 0; i < linelock->index; i++, lv++) { 422 if (lv->length == 0) 423 continue; 424 425 /* is page full ? */ 426 if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { 427 /* page become full: move on to next page */ 428 lmNextPage(log); 429 430 bp = log->bp; 431 lp = (struct logpage *) bp->l_ldata; 432 dstoffset = LOGPHDRSIZE; 433 } 434 435 /* 436 * move log vector data 437 */ 438 src = (u8 *) p + (lv->offset << l2linesize); 439 srclen = lv->length << l2linesize; 440 len += srclen; 441 while (srclen > 0) { 442 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; 443 nbytes = min(freespace, srclen); 444 dst = (caddr_t) lp + dstoffset; 445 memcpy(dst, src, nbytes); 446 dstoffset += nbytes; 447 448 /* is page not full ? */ 449 if (dstoffset < LOGPSIZE - LOGPTLRSIZE) 450 break; 451 452 /* page become full: move on to next page */ 453 lmNextPage(log); 454 455 bp = (struct lbuf *) log->bp; 456 lp = (struct logpage *) bp->l_ldata; 457 dstoffset = LOGPHDRSIZE; 458 459 srclen -= nbytes; 460 src += nbytes; 461 } 462 463 /* 464 * move log vector descriptor 465 */ 466 len += 4; 467 lvd = (struct lvd *) ((caddr_t) lp + dstoffset); 468 lvd->offset = cpu_to_le16(lv->offset); 469 lvd->length = cpu_to_le16(lv->length); 470 dstoffset += 4; 471 jfs_info("lmWriteRecord: lv offset:%d length:%d", 472 lv->offset, lv->length); 473 } 474 475 if ((i = linelock->next)) { 476 linelock = (struct linelock *) lid_to_tlock(i); 477 goto moveData; 478 } 479 480 /* 481 * move log record descriptor 482 */ 483 moveLrd: 484 lrd->length = cpu_to_le16(len); 485 486 src = (caddr_t) lrd; 487 srclen = LOGRDSIZE; 488 489 while (srclen > 0) { 490 freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; 491 nbytes = min(freespace, srclen); 492 dst = (caddr_t) lp + dstoffset; 493 memcpy(dst, src, nbytes); 494 495 dstoffset += nbytes; 496 srclen -= nbytes; 497 498 /* are there more to move than freespace of page ? */ 499 if (srclen) 500 goto pageFull; 501 502 /* 503 * end of log record descriptor 504 */ 505 506 /* update last log record eor */ 507 log->eor = dstoffset; 508 bp->l_eor = dstoffset; 509 lsn = (log->page << L2LOGPSIZE) + dstoffset; 510 511 if (lrd->type & cpu_to_le16(LOG_COMMIT)) { 512 tblk->clsn = lsn; 513 jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, 514 bp->l_eor); 515 516 INCREMENT(lmStat.commit); /* # of commit */ 517 518 /* 519 * enqueue tblock for group commit: 520 * 521 * enqueue tblock of non-trivial/synchronous COMMIT 522 * at tail of group commit queue 523 * (trivial/asynchronous COMMITs are ignored by 524 * group commit.) 525 */ 526 LOGGC_LOCK(log); 527 528 /* init tblock gc state */ 529 tblk->flag = tblkGC_QUEUE; 530 tblk->bp = log->bp; 531 tblk->pn = log->page; 532 tblk->eor = log->eor; 533 534 /* enqueue transaction to commit queue */ 535 list_add_tail(&tblk->cqueue, &log->cqueue); 536 537 LOGGC_UNLOCK(log); 538 } 539 540 jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", 541 le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); 542 543 /* page not full ? */ 544 if (dstoffset < LOGPSIZE - LOGPTLRSIZE) 545 return lsn; 546 547 pageFull: 548 /* page become full: move on to next page */ 549 lmNextPage(log); 550 551 bp = (struct lbuf *) log->bp; 552 lp = (struct logpage *) bp->l_ldata; 553 dstoffset = LOGPHDRSIZE; 554 src += nbytes; 555 } 556 557 return lsn; 558 } 559 560 561 /* 562 * NAME: lmNextPage() 563 * 564 * FUNCTION: write current page and allocate next page. 565 * 566 * PARAMETER: log 567 * 568 * RETURN: 0 569 * 570 * serialization: LOG_LOCK() held on entry/exit 571 */ 572 static int lmNextPage(struct jfs_log * log) 573 { 574 struct logpage *lp; 575 int lspn; /* log sequence page number */ 576 int pn; /* current page number */ 577 struct lbuf *bp; 578 struct lbuf *nextbp; 579 struct tblock *tblk; 580 581 /* get current log page number and log sequence page number */ 582 pn = log->page; 583 bp = log->bp; 584 lp = (struct logpage *) bp->l_ldata; 585 lspn = le32_to_cpu(lp->h.page); 586 587 LOGGC_LOCK(log); 588 589 /* 590 * write or queue the full page at the tail of write queue 591 */ 592 /* get the tail tblk on commit queue */ 593 if (list_empty(&log->cqueue)) 594 tblk = NULL; 595 else 596 tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); 597 598 /* every tblk who has COMMIT record on the current page, 599 * and has not been committed, must be on commit queue 600 * since tblk is queued at commit queueu at the time 601 * of writing its COMMIT record on the page before 602 * page becomes full (even though the tblk thread 603 * who wrote COMMIT record may have been suspended 604 * currently); 605 */ 606 607 /* is page bound with outstanding tail tblk ? */ 608 if (tblk && tblk->pn == pn) { 609 /* mark tblk for end-of-page */ 610 tblk->flag |= tblkGC_EOP; 611 612 if (log->cflag & logGC_PAGEOUT) { 613 /* if page is not already on write queue, 614 * just enqueue (no lbmWRITE to prevent redrive) 615 * buffer to wqueue to ensure correct serial order 616 * of the pages since log pages will be added 617 * continuously 618 */ 619 if (bp->l_wqnext == NULL) 620 lbmWrite(log, bp, 0, 0); 621 } else { 622 /* 623 * No current GC leader, initiate group commit 624 */ 625 log->cflag |= logGC_PAGEOUT; 626 lmGCwrite(log, 0); 627 } 628 } 629 /* page is not bound with outstanding tblk: 630 * init write or mark it to be redriven (lbmWRITE) 631 */ 632 else { 633 /* finalize the page */ 634 bp->l_ceor = bp->l_eor; 635 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); 636 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); 637 } 638 LOGGC_UNLOCK(log); 639 640 /* 641 * allocate/initialize next page 642 */ 643 /* if log wraps, the first data page of log is 2 644 * (0 never used, 1 is superblock). 645 */ 646 log->page = (pn == log->size - 1) ? 2 : pn + 1; 647 log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ 648 649 /* allocate/initialize next log page buffer */ 650 nextbp = lbmAllocate(log, log->page); 651 nextbp->l_eor = log->eor; 652 log->bp = nextbp; 653 654 /* initialize next log page */ 655 lp = (struct logpage *) nextbp->l_ldata; 656 lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); 657 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); 658 659 return 0; 660 } 661 662 663 /* 664 * NAME: lmGroupCommit() 665 * 666 * FUNCTION: group commit 667 * initiate pageout of the pages with COMMIT in the order of 668 * page number - redrive pageout of the page at the head of 669 * pageout queue until full page has been written. 670 * 671 * RETURN: 672 * 673 * NOTE: 674 * LOGGC_LOCK serializes log group commit queue, and 675 * transaction blocks on the commit queue. 676 * N.B. LOG_LOCK is NOT held during lmGroupCommit(). 677 */ 678 int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) 679 { 680 int rc = 0; 681 682 LOGGC_LOCK(log); 683 684 /* group committed already ? */ 685 if (tblk->flag & tblkGC_COMMITTED) { 686 if (tblk->flag & tblkGC_ERROR) 687 rc = -EIO; 688 689 LOGGC_UNLOCK(log); 690 return rc; 691 } 692 jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); 693 694 if (tblk->xflag & COMMIT_LAZY) 695 tblk->flag |= tblkGC_LAZY; 696 697 if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && 698 (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) 699 || jfs_tlocks_low)) { 700 /* 701 * No pageout in progress 702 * 703 * start group commit as its group leader. 704 */ 705 log->cflag |= logGC_PAGEOUT; 706 707 lmGCwrite(log, 0); 708 } 709 710 if (tblk->xflag & COMMIT_LAZY) { 711 /* 712 * Lazy transactions can leave now 713 */ 714 LOGGC_UNLOCK(log); 715 return 0; 716 } 717 718 /* lmGCwrite gives up LOGGC_LOCK, check again */ 719 720 if (tblk->flag & tblkGC_COMMITTED) { 721 if (tblk->flag & tblkGC_ERROR) 722 rc = -EIO; 723 724 LOGGC_UNLOCK(log); 725 return rc; 726 } 727 728 /* upcount transaction waiting for completion 729 */ 730 log->gcrtc++; 731 tblk->flag |= tblkGC_READY; 732 733 __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), 734 LOGGC_LOCK(log), LOGGC_UNLOCK(log)); 735 736 /* removed from commit queue */ 737 if (tblk->flag & tblkGC_ERROR) 738 rc = -EIO; 739 740 LOGGC_UNLOCK(log); 741 return rc; 742 } 743 744 /* 745 * NAME: lmGCwrite() 746 * 747 * FUNCTION: group commit write 748 * initiate write of log page, building a group of all transactions 749 * with commit records on that page. 750 * 751 * RETURN: None 752 * 753 * NOTE: 754 * LOGGC_LOCK must be held by caller. 755 * N.B. LOG_LOCK is NOT held during lmGroupCommit(). 756 */ 757 static void lmGCwrite(struct jfs_log * log, int cant_write) 758 { 759 struct lbuf *bp; 760 struct logpage *lp; 761 int gcpn; /* group commit page number */ 762 struct tblock *tblk; 763 struct tblock *xtblk = NULL; 764 765 /* 766 * build the commit group of a log page 767 * 768 * scan commit queue and make a commit group of all 769 * transactions with COMMIT records on the same log page. 770 */ 771 /* get the head tblk on the commit queue */ 772 gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; 773 774 list_for_each_entry(tblk, &log->cqueue, cqueue) { 775 if (tblk->pn != gcpn) 776 break; 777 778 xtblk = tblk; 779 780 /* state transition: (QUEUE, READY) -> COMMIT */ 781 tblk->flag |= tblkGC_COMMIT; 782 } 783 tblk = xtblk; /* last tblk of the page */ 784 785 /* 786 * pageout to commit transactions on the log page. 787 */ 788 bp = (struct lbuf *) tblk->bp; 789 lp = (struct logpage *) bp->l_ldata; 790 /* is page already full ? */ 791 if (tblk->flag & tblkGC_EOP) { 792 /* mark page to free at end of group commit of the page */ 793 tblk->flag &= ~tblkGC_EOP; 794 tblk->flag |= tblkGC_FREE; 795 bp->l_ceor = bp->l_eor; 796 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); 797 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, 798 cant_write); 799 INCREMENT(lmStat.full_page); 800 } 801 /* page is not yet full */ 802 else { 803 bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ 804 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); 805 lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); 806 INCREMENT(lmStat.partial_page); 807 } 808 } 809 810 /* 811 * NAME: lmPostGC() 812 * 813 * FUNCTION: group commit post-processing 814 * Processes transactions after their commit records have been written 815 * to disk, redriving log I/O if necessary. 816 * 817 * RETURN: None 818 * 819 * NOTE: 820 * This routine is called a interrupt time by lbmIODone 821 */ 822 static void lmPostGC(struct lbuf * bp) 823 { 824 unsigned long flags; 825 struct jfs_log *log = bp->l_log; 826 struct logpage *lp; 827 struct tblock *tblk, *temp; 828 829 //LOGGC_LOCK(log); 830 spin_lock_irqsave(&log->gclock, flags); 831 /* 832 * current pageout of group commit completed. 833 * 834 * remove/wakeup transactions from commit queue who were 835 * group committed with the current log page 836 */ 837 list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { 838 if (!(tblk->flag & tblkGC_COMMIT)) 839 break; 840 /* if transaction was marked GC_COMMIT then 841 * it has been shipped in the current pageout 842 * and made it to disk - it is committed. 843 */ 844 845 if (bp->l_flag & lbmERROR) 846 tblk->flag |= tblkGC_ERROR; 847 848 /* remove it from the commit queue */ 849 list_del(&tblk->cqueue); 850 tblk->flag &= ~tblkGC_QUEUE; 851 852 if (tblk == log->flush_tblk) { 853 /* we can stop flushing the log now */ 854 clear_bit(log_FLUSH, &log->flag); 855 log->flush_tblk = NULL; 856 } 857 858 jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, 859 tblk->flag); 860 861 if (!(tblk->xflag & COMMIT_FORCE)) 862 /* 863 * Hand tblk over to lazy commit thread 864 */ 865 txLazyUnlock(tblk); 866 else { 867 /* state transition: COMMIT -> COMMITTED */ 868 tblk->flag |= tblkGC_COMMITTED; 869 870 if (tblk->flag & tblkGC_READY) 871 log->gcrtc--; 872 873 LOGGC_WAKEUP(tblk); 874 } 875 876 /* was page full before pageout ? 877 * (and this is the last tblk bound with the page) 878 */ 879 if (tblk->flag & tblkGC_FREE) 880 lbmFree(bp); 881 /* did page become full after pageout ? 882 * (and this is the last tblk bound with the page) 883 */ 884 else if (tblk->flag & tblkGC_EOP) { 885 /* finalize the page */ 886 lp = (struct logpage *) bp->l_ldata; 887 bp->l_ceor = bp->l_eor; 888 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); 889 jfs_info("lmPostGC: calling lbmWrite"); 890 lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 891 1); 892 } 893 894 } 895 896 /* are there any transactions who have entered lnGroupCommit() 897 * (whose COMMITs are after that of the last log page written. 898 * They are waiting for new group commit (above at (SLEEP 1)) 899 * or lazy transactions are on a full (queued) log page, 900 * select the latest ready transaction as new group leader and 901 * wake her up to lead her group. 902 */ 903 if ((!list_empty(&log->cqueue)) && 904 ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || 905 test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) 906 /* 907 * Call lmGCwrite with new group leader 908 */ 909 lmGCwrite(log, 1); 910 911 /* no transaction are ready yet (transactions are only just 912 * queued (GC_QUEUE) and not entered for group commit yet). 913 * the first transaction entering group commit 914 * will elect herself as new group leader. 915 */ 916 else 917 log->cflag &= ~logGC_PAGEOUT; 918 919 //LOGGC_UNLOCK(log); 920 spin_unlock_irqrestore(&log->gclock, flags); 921 return; 922 } 923 924 /* 925 * NAME: lmLogSync() 926 * 927 * FUNCTION: write log SYNCPT record for specified log 928 * if new sync address is available 929 * (normally the case if sync() is executed by back-ground 930 * process). 931 * calculate new value of i_nextsync which determines when 932 * this code is called again. 933 * 934 * PARAMETERS: log - log structure 935 * hard_sync - 1 to force all metadata to be written 936 * 937 * RETURN: 0 938 * 939 * serialization: LOG_LOCK() held on entry/exit 940 */ 941 static int lmLogSync(struct jfs_log * log, int hard_sync) 942 { 943 int logsize; 944 int written; /* written since last syncpt */ 945 int free; /* free space left available */ 946 int delta; /* additional delta to write normally */ 947 int more; /* additional write granted */ 948 struct lrd lrd; 949 int lsn; 950 struct logsyncblk *lp; 951 unsigned long flags; 952 953 /* push dirty metapages out to disk */ 954 if (hard_sync) 955 write_special_inodes(log, filemap_fdatawrite); 956 else 957 write_special_inodes(log, filemap_flush); 958 959 /* 960 * forward syncpt 961 */ 962 /* if last sync is same as last syncpt, 963 * invoke sync point forward processing to update sync. 964 */ 965 966 if (log->sync == log->syncpt) { 967 LOGSYNC_LOCK(log, flags); 968 if (list_empty(&log->synclist)) 969 log->sync = log->lsn; 970 else { 971 lp = list_entry(log->synclist.next, 972 struct logsyncblk, synclist); 973 log->sync = lp->lsn; 974 } 975 LOGSYNC_UNLOCK(log, flags); 976 977 } 978 979 /* if sync is different from last syncpt, 980 * write a SYNCPT record with syncpt = sync. 981 * reset syncpt = sync 982 */ 983 if (log->sync != log->syncpt) { 984 lrd.logtid = 0; 985 lrd.backchain = 0; 986 lrd.type = cpu_to_le16(LOG_SYNCPT); 987 lrd.length = 0; 988 lrd.log.syncpt.sync = cpu_to_le32(log->sync); 989 lsn = lmWriteRecord(log, NULL, &lrd, NULL); 990 991 log->syncpt = log->sync; 992 } else 993 lsn = log->lsn; 994 995 /* 996 * setup next syncpt trigger (SWAG) 997 */ 998 logsize = log->logsize; 999 1000 logdiff(written, lsn, log); 1001 free = logsize - written; 1002 delta = LOGSYNC_DELTA(logsize); 1003 more = min(free / 2, delta); 1004 if (more < 2 * LOGPSIZE) { 1005 jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); 1006 /* 1007 * log wrapping 1008 * 1009 * option 1 - panic ? No.! 1010 * option 2 - shutdown file systems 1011 * associated with log ? 1012 * option 3 - extend log ? 1013 * option 4 - second chance 1014 * 1015 * mark log wrapped, and continue. 1016 * when all active transactions are completed, 1017 * mark log valid for recovery. 1018 * if crashed during invalid state, log state 1019 * implies invalid log, forcing fsck(). 1020 */ 1021 /* mark log state log wrap in log superblock */ 1022 /* log->state = LOGWRAP; */ 1023 1024 /* reset sync point computation */ 1025 log->syncpt = log->sync = lsn; 1026 log->nextsync = delta; 1027 } else 1028 /* next syncpt trigger = written + more */ 1029 log->nextsync = written + more; 1030 1031 /* if number of bytes written from last sync point is more 1032 * than 1/4 of the log size, stop new transactions from 1033 * starting until all current transactions are completed 1034 * by setting syncbarrier flag. 1035 */ 1036 if (!test_bit(log_SYNCBARRIER, &log->flag) && 1037 (written > LOGSYNC_BARRIER(logsize)) && log->active) { 1038 set_bit(log_SYNCBARRIER, &log->flag); 1039 jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, 1040 log->syncpt); 1041 /* 1042 * We may have to initiate group commit 1043 */ 1044 jfs_flush_journal(log, 0); 1045 } 1046 1047 return lsn; 1048 } 1049 1050 /* 1051 * NAME: jfs_syncpt 1052 * 1053 * FUNCTION: write log SYNCPT record for specified log 1054 * 1055 * PARAMETERS: log - log structure 1056 * hard_sync - set to 1 to force metadata to be written 1057 */ 1058 void jfs_syncpt(struct jfs_log *log, int hard_sync) 1059 { LOG_LOCK(log); 1060 lmLogSync(log, hard_sync); 1061 LOG_UNLOCK(log); 1062 } 1063 1064 /* 1065 * NAME: lmLogOpen() 1066 * 1067 * FUNCTION: open the log on first open; 1068 * insert filesystem in the active list of the log. 1069 * 1070 * PARAMETER: ipmnt - file system mount inode 1071 * iplog - log inode (out) 1072 * 1073 * RETURN: 1074 * 1075 * serialization: 1076 */ 1077 int lmLogOpen(struct super_block *sb) 1078 { 1079 int rc; 1080 struct block_device *bdev; 1081 struct jfs_log *log; 1082 struct jfs_sb_info *sbi = JFS_SBI(sb); 1083 1084 if (sbi->flag & JFS_NOINTEGRITY) 1085 return open_dummy_log(sb); 1086 1087 if (sbi->mntflag & JFS_INLINELOG) 1088 return open_inline_log(sb); 1089 1090 mutex_lock(&jfs_log_mutex); 1091 list_for_each_entry(log, &jfs_external_logs, journal_list) { 1092 if (log->bdev->bd_dev == sbi->logdev) { 1093 if (memcmp(log->uuid, sbi->loguuid, 1094 sizeof(log->uuid))) { 1095 jfs_warn("wrong uuid on JFS journal\n"); 1096 mutex_unlock(&jfs_log_mutex); 1097 return -EINVAL; 1098 } 1099 /* 1100 * add file system to log active file system list 1101 */ 1102 if ((rc = lmLogFileSystem(log, sbi, 1))) { 1103 mutex_unlock(&jfs_log_mutex); 1104 return rc; 1105 } 1106 goto journal_found; 1107 } 1108 } 1109 1110 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { 1111 mutex_unlock(&jfs_log_mutex); 1112 return -ENOMEM; 1113 } 1114 INIT_LIST_HEAD(&log->sb_list); 1115 init_waitqueue_head(&log->syncwait); 1116 1117 /* 1118 * external log as separate logical volume 1119 * 1120 * file systems to log may have n-to-1 relationship; 1121 */ 1122 1123 bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE); 1124 if (IS_ERR(bdev)) { 1125 rc = -PTR_ERR(bdev); 1126 goto free; 1127 } 1128 1129 if ((rc = bd_claim(bdev, log))) { 1130 goto close; 1131 } 1132 1133 log->bdev = bdev; 1134 memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); 1135 1136 /* 1137 * initialize log: 1138 */ 1139 if ((rc = lmLogInit(log))) 1140 goto unclaim; 1141 1142 list_add(&log->journal_list, &jfs_external_logs); 1143 1144 /* 1145 * add file system to log active file system list 1146 */ 1147 if ((rc = lmLogFileSystem(log, sbi, 1))) 1148 goto shutdown; 1149 1150 journal_found: 1151 LOG_LOCK(log); 1152 list_add(&sbi->log_list, &log->sb_list); 1153 sbi->log = log; 1154 LOG_UNLOCK(log); 1155 1156 mutex_unlock(&jfs_log_mutex); 1157 return 0; 1158 1159 /* 1160 * unwind on error 1161 */ 1162 shutdown: /* unwind lbmLogInit() */ 1163 list_del(&log->journal_list); 1164 lbmLogShutdown(log); 1165 1166 unclaim: 1167 bd_release(bdev); 1168 1169 close: /* close external log device */ 1170 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 1171 1172 free: /* free log descriptor */ 1173 mutex_unlock(&jfs_log_mutex); 1174 kfree(log); 1175 1176 jfs_warn("lmLogOpen: exit(%d)", rc); 1177 return rc; 1178 } 1179 1180 static int open_inline_log(struct super_block *sb) 1181 { 1182 struct jfs_log *log; 1183 int rc; 1184 1185 if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) 1186 return -ENOMEM; 1187 INIT_LIST_HEAD(&log->sb_list); 1188 init_waitqueue_head(&log->syncwait); 1189 1190 set_bit(log_INLINELOG, &log->flag); 1191 log->bdev = sb->s_bdev; 1192 log->base = addressPXD(&JFS_SBI(sb)->logpxd); 1193 log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> 1194 (L2LOGPSIZE - sb->s_blocksize_bits); 1195 log->l2bsize = sb->s_blocksize_bits; 1196 ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); 1197 1198 /* 1199 * initialize log. 1200 */ 1201 if ((rc = lmLogInit(log))) { 1202 kfree(log); 1203 jfs_warn("lmLogOpen: exit(%d)", rc); 1204 return rc; 1205 } 1206 1207 list_add(&JFS_SBI(sb)->log_list, &log->sb_list); 1208 JFS_SBI(sb)->log = log; 1209 1210 return rc; 1211 } 1212 1213 static int open_dummy_log(struct super_block *sb) 1214 { 1215 int rc; 1216 1217 mutex_lock(&jfs_log_mutex); 1218 if (!dummy_log) { 1219 dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); 1220 if (!dummy_log) { 1221 mutex_unlock(&jfs_log_mutex); 1222 return -ENOMEM; 1223 } 1224 INIT_LIST_HEAD(&dummy_log->sb_list); 1225 init_waitqueue_head(&dummy_log->syncwait); 1226 dummy_log->no_integrity = 1; 1227 /* Make up some stuff */ 1228 dummy_log->base = 0; 1229 dummy_log->size = 1024; 1230 rc = lmLogInit(dummy_log); 1231 if (rc) { 1232 kfree(dummy_log); 1233 dummy_log = NULL; 1234 mutex_unlock(&jfs_log_mutex); 1235 return rc; 1236 } 1237 } 1238 1239 LOG_LOCK(dummy_log); 1240 list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); 1241 JFS_SBI(sb)->log = dummy_log; 1242 LOG_UNLOCK(dummy_log); 1243 mutex_unlock(&jfs_log_mutex); 1244 1245 return 0; 1246 } 1247 1248 /* 1249 * NAME: lmLogInit() 1250 * 1251 * FUNCTION: log initialization at first log open. 1252 * 1253 * logredo() (or logformat()) should have been run previously. 1254 * initialize the log from log superblock. 1255 * set the log state in the superblock to LOGMOUNT and 1256 * write SYNCPT log record. 1257 * 1258 * PARAMETER: log - log structure 1259 * 1260 * RETURN: 0 - if ok 1261 * -EINVAL - bad log magic number or superblock dirty 1262 * error returned from logwait() 1263 * 1264 * serialization: single first open thread 1265 */ 1266 int lmLogInit(struct jfs_log * log) 1267 { 1268 int rc = 0; 1269 struct lrd lrd; 1270 struct logsuper *logsuper; 1271 struct lbuf *bpsuper; 1272 struct lbuf *bp; 1273 struct logpage *lp; 1274 int lsn = 0; 1275 1276 jfs_info("lmLogInit: log:0x%p", log); 1277 1278 /* initialize the group commit serialization lock */ 1279 LOGGC_LOCK_INIT(log); 1280 1281 /* allocate/initialize the log write serialization lock */ 1282 LOG_LOCK_INIT(log); 1283 1284 LOGSYNC_LOCK_INIT(log); 1285 1286 INIT_LIST_HEAD(&log->synclist); 1287 1288 INIT_LIST_HEAD(&log->cqueue); 1289 log->flush_tblk = NULL; 1290 1291 log->count = 0; 1292 1293 /* 1294 * initialize log i/o 1295 */ 1296 if ((rc = lbmLogInit(log))) 1297 return rc; 1298 1299 if (!test_bit(log_INLINELOG, &log->flag)) 1300 log->l2bsize = L2LOGPSIZE; 1301 1302 /* check for disabled journaling to disk */ 1303 if (log->no_integrity) { 1304 /* 1305 * Journal pages will still be filled. When the time comes 1306 * to actually do the I/O, the write is not done, and the 1307 * endio routine is called directly. 1308 */ 1309 bp = lbmAllocate(log , 0); 1310 log->bp = bp; 1311 bp->l_pn = bp->l_eor = 0; 1312 } else { 1313 /* 1314 * validate log superblock 1315 */ 1316 if ((rc = lbmRead(log, 1, &bpsuper))) 1317 goto errout10; 1318 1319 logsuper = (struct logsuper *) bpsuper->l_ldata; 1320 1321 if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { 1322 jfs_warn("*** Log Format Error ! ***"); 1323 rc = -EINVAL; 1324 goto errout20; 1325 } 1326 1327 /* logredo() should have been run successfully. */ 1328 if (logsuper->state != cpu_to_le32(LOGREDONE)) { 1329 jfs_warn("*** Log Is Dirty ! ***"); 1330 rc = -EINVAL; 1331 goto errout20; 1332 } 1333 1334 /* initialize log from log superblock */ 1335 if (test_bit(log_INLINELOG,&log->flag)) { 1336 if (log->size != le32_to_cpu(logsuper->size)) { 1337 rc = -EINVAL; 1338 goto errout20; 1339 } 1340 jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " 1341 "size:0x%x", log, 1342 (unsigned long long) log->base, log->size); 1343 } else { 1344 if (memcmp(logsuper->uuid, log->uuid, 16)) { 1345 jfs_warn("wrong uuid on JFS log device"); 1346 goto errout20; 1347 } 1348 log->size = le32_to_cpu(logsuper->size); 1349 log->l2bsize = le32_to_cpu(logsuper->l2bsize); 1350 jfs_info("lmLogInit: external log:0x%p base:0x%Lx " 1351 "size:0x%x", log, 1352 (unsigned long long) log->base, log->size); 1353 } 1354 1355 log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; 1356 log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); 1357 1358 /* 1359 * initialize for log append write mode 1360 */ 1361 /* establish current/end-of-log page/buffer */ 1362 if ((rc = lbmRead(log, log->page, &bp))) 1363 goto errout20; 1364 1365 lp = (struct logpage *) bp->l_ldata; 1366 1367 jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", 1368 le32_to_cpu(logsuper->end), log->page, log->eor, 1369 le16_to_cpu(lp->h.eor)); 1370 1371 log->bp = bp; 1372 bp->l_pn = log->page; 1373 bp->l_eor = log->eor; 1374 1375 /* if current page is full, move on to next page */ 1376 if (log->eor >= LOGPSIZE - LOGPTLRSIZE) 1377 lmNextPage(log); 1378 1379 /* 1380 * initialize log syncpoint 1381 */ 1382 /* 1383 * write the first SYNCPT record with syncpoint = 0 1384 * (i.e., log redo up to HERE !); 1385 * remove current page from lbm write queue at end of pageout 1386 * (to write log superblock update), but do not release to 1387 * freelist; 1388 */ 1389 lrd.logtid = 0; 1390 lrd.backchain = 0; 1391 lrd.type = cpu_to_le16(LOG_SYNCPT); 1392 lrd.length = 0; 1393 lrd.log.syncpt.sync = 0; 1394 lsn = lmWriteRecord(log, NULL, &lrd, NULL); 1395 bp = log->bp; 1396 bp->l_ceor = bp->l_eor; 1397 lp = (struct logpage *) bp->l_ldata; 1398 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); 1399 lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); 1400 if ((rc = lbmIOWait(bp, 0))) 1401 goto errout30; 1402 1403 /* 1404 * update/write superblock 1405 */ 1406 logsuper->state = cpu_to_le32(LOGMOUNT); 1407 log->serial = le32_to_cpu(logsuper->serial) + 1; 1408 logsuper->serial = cpu_to_le32(log->serial); 1409 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); 1410 if ((rc = lbmIOWait(bpsuper, lbmFREE))) 1411 goto errout30; 1412 } 1413 1414 /* initialize logsync parameters */ 1415 log->logsize = (log->size - 2) << L2LOGPSIZE; 1416 log->lsn = lsn; 1417 log->syncpt = lsn; 1418 log->sync = log->syncpt; 1419 log->nextsync = LOGSYNC_DELTA(log->logsize); 1420 1421 jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", 1422 log->lsn, log->syncpt, log->sync); 1423 1424 /* 1425 * initialize for lazy/group commit 1426 */ 1427 log->clsn = lsn; 1428 1429 return 0; 1430 1431 /* 1432 * unwind on error 1433 */ 1434 errout30: /* release log page */ 1435 log->wqueue = NULL; 1436 bp->l_wqnext = NULL; 1437 lbmFree(bp); 1438 1439 errout20: /* release log superblock */ 1440 lbmFree(bpsuper); 1441 1442 errout10: /* unwind lbmLogInit() */ 1443 lbmLogShutdown(log); 1444 1445 jfs_warn("lmLogInit: exit(%d)", rc); 1446 return rc; 1447 } 1448 1449 1450 /* 1451 * NAME: lmLogClose() 1452 * 1453 * FUNCTION: remove file system <ipmnt> from active list of log <iplog> 1454 * and close it on last close. 1455 * 1456 * PARAMETER: sb - superblock 1457 * 1458 * RETURN: errors from subroutines 1459 * 1460 * serialization: 1461 */ 1462 int lmLogClose(struct super_block *sb) 1463 { 1464 struct jfs_sb_info *sbi = JFS_SBI(sb); 1465 struct jfs_log *log = sbi->log; 1466 struct block_device *bdev; 1467 int rc = 0; 1468 1469 jfs_info("lmLogClose: log:0x%p", log); 1470 1471 mutex_lock(&jfs_log_mutex); 1472 LOG_LOCK(log); 1473 list_del(&sbi->log_list); 1474 LOG_UNLOCK(log); 1475 sbi->log = NULL; 1476 1477 /* 1478 * We need to make sure all of the "written" metapages 1479 * actually make it to disk 1480 */ 1481 sync_blockdev(sb->s_bdev); 1482 1483 if (test_bit(log_INLINELOG, &log->flag)) { 1484 /* 1485 * in-line log in host file system 1486 */ 1487 rc = lmLogShutdown(log); 1488 kfree(log); 1489 goto out; 1490 } 1491 1492 if (!log->no_integrity) 1493 lmLogFileSystem(log, sbi, 0); 1494 1495 if (!list_empty(&log->sb_list)) 1496 goto out; 1497 1498 /* 1499 * TODO: ensure that the dummy_log is in a state to allow 1500 * lbmLogShutdown to deallocate all the buffers and call 1501 * kfree against dummy_log. For now, leave dummy_log & its 1502 * buffers in memory, and resuse if another no-integrity mount 1503 * is requested. 1504 */ 1505 if (log->no_integrity) 1506 goto out; 1507 1508 /* 1509 * external log as separate logical volume 1510 */ 1511 list_del(&log->journal_list); 1512 bdev = log->bdev; 1513 rc = lmLogShutdown(log); 1514 1515 bd_release(bdev); 1516 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 1517 1518 kfree(log); 1519 1520 out: 1521 mutex_unlock(&jfs_log_mutex); 1522 jfs_info("lmLogClose: exit(%d)", rc); 1523 return rc; 1524 } 1525 1526 1527 /* 1528 * NAME: jfs_flush_journal() 1529 * 1530 * FUNCTION: initiate write of any outstanding transactions to the journal 1531 * and optionally wait until they are all written to disk 1532 * 1533 * wait == 0 flush until latest txn is committed, don't wait 1534 * wait == 1 flush until latest txn is committed, wait 1535 * wait > 1 flush until all txn's are complete, wait 1536 */ 1537 void jfs_flush_journal(struct jfs_log *log, int wait) 1538 { 1539 int i; 1540 struct tblock *target = NULL; 1541 1542 /* jfs_write_inode may call us during read-only mount */ 1543 if (!log) 1544 return; 1545 1546 jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); 1547 1548 LOGGC_LOCK(log); 1549 1550 if (!list_empty(&log->cqueue)) { 1551 /* 1552 * This ensures that we will keep writing to the journal as long 1553 * as there are unwritten commit records 1554 */ 1555 target = list_entry(log->cqueue.prev, struct tblock, cqueue); 1556 1557 if (test_bit(log_FLUSH, &log->flag)) { 1558 /* 1559 * We're already flushing. 1560 * if flush_tblk is NULL, we are flushing everything, 1561 * so leave it that way. Otherwise, update it to the 1562 * latest transaction 1563 */ 1564 if (log->flush_tblk) 1565 log->flush_tblk = target; 1566 } else { 1567 /* Only flush until latest transaction is committed */ 1568 log->flush_tblk = target; 1569 set_bit(log_FLUSH, &log->flag); 1570 1571 /* 1572 * Initiate I/O on outstanding transactions 1573 */ 1574 if (!(log->cflag & logGC_PAGEOUT)) { 1575 log->cflag |= logGC_PAGEOUT; 1576 lmGCwrite(log, 0); 1577 } 1578 } 1579 } 1580 if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { 1581 /* Flush until all activity complete */ 1582 set_bit(log_FLUSH, &log->flag); 1583 log->flush_tblk = NULL; 1584 } 1585 1586 if (wait && target && !(target->flag & tblkGC_COMMITTED)) { 1587 DECLARE_WAITQUEUE(__wait, current); 1588 1589 add_wait_queue(&target->gcwait, &__wait); 1590 set_current_state(TASK_UNINTERRUPTIBLE); 1591 LOGGC_UNLOCK(log); 1592 schedule(); 1593 __set_current_state(TASK_RUNNING); 1594 LOGGC_LOCK(log); 1595 remove_wait_queue(&target->gcwait, &__wait); 1596 } 1597 LOGGC_UNLOCK(log); 1598 1599 if (wait < 2) 1600 return; 1601 1602 write_special_inodes(log, filemap_fdatawrite); 1603 1604 /* 1605 * If there was recent activity, we may need to wait 1606 * for the lazycommit thread to catch up 1607 */ 1608 if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { 1609 for (i = 0; i < 200; i++) { /* Too much? */ 1610 msleep(250); 1611 write_special_inodes(log, filemap_fdatawrite); 1612 if (list_empty(&log->cqueue) && 1613 list_empty(&log->synclist)) 1614 break; 1615 } 1616 } 1617 assert(list_empty(&log->cqueue)); 1618 1619 #ifdef CONFIG_JFS_DEBUG 1620 if (!list_empty(&log->synclist)) { 1621 struct logsyncblk *lp; 1622 1623 printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); 1624 list_for_each_entry(lp, &log->synclist, synclist) { 1625 if (lp->xflag & COMMIT_PAGE) { 1626 struct metapage *mp = (struct metapage *)lp; 1627 print_hex_dump(KERN_ERR, "metapage: ", 1628 DUMP_PREFIX_ADDRESS, 16, 4, 1629 mp, sizeof(struct metapage), 0); 1630 print_hex_dump(KERN_ERR, "page: ", 1631 DUMP_PREFIX_ADDRESS, 16, 1632 sizeof(long), mp->page, 1633 sizeof(struct page), 0); 1634 } else 1635 print_hex_dump(KERN_ERR, "tblock:", 1636 DUMP_PREFIX_ADDRESS, 16, 4, 1637 lp, sizeof(struct tblock), 0); 1638 } 1639 } 1640 #else 1641 WARN_ON(!list_empty(&log->synclist)); 1642 #endif 1643 clear_bit(log_FLUSH, &log->flag); 1644 } 1645 1646 /* 1647 * NAME: lmLogShutdown() 1648 * 1649 * FUNCTION: log shutdown at last LogClose(). 1650 * 1651 * write log syncpt record. 1652 * update super block to set redone flag to 0. 1653 * 1654 * PARAMETER: log - log inode 1655 * 1656 * RETURN: 0 - success 1657 * 1658 * serialization: single last close thread 1659 */ 1660 int lmLogShutdown(struct jfs_log * log) 1661 { 1662 int rc; 1663 struct lrd lrd; 1664 int lsn; 1665 struct logsuper *logsuper; 1666 struct lbuf *bpsuper; 1667 struct lbuf *bp; 1668 struct logpage *lp; 1669 1670 jfs_info("lmLogShutdown: log:0x%p", log); 1671 1672 jfs_flush_journal(log, 2); 1673 1674 /* 1675 * write the last SYNCPT record with syncpoint = 0 1676 * (i.e., log redo up to HERE !) 1677 */ 1678 lrd.logtid = 0; 1679 lrd.backchain = 0; 1680 lrd.type = cpu_to_le16(LOG_SYNCPT); 1681 lrd.length = 0; 1682 lrd.log.syncpt.sync = 0; 1683 1684 lsn = lmWriteRecord(log, NULL, &lrd, NULL); 1685 bp = log->bp; 1686 lp = (struct logpage *) bp->l_ldata; 1687 lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); 1688 lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); 1689 lbmIOWait(log->bp, lbmFREE); 1690 log->bp = NULL; 1691 1692 /* 1693 * synchronous update log superblock 1694 * mark log state as shutdown cleanly 1695 * (i.e., Log does not need to be replayed). 1696 */ 1697 if ((rc = lbmRead(log, 1, &bpsuper))) 1698 goto out; 1699 1700 logsuper = (struct logsuper *) bpsuper->l_ldata; 1701 logsuper->state = cpu_to_le32(LOGREDONE); 1702 logsuper->end = cpu_to_le32(lsn); 1703 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); 1704 rc = lbmIOWait(bpsuper, lbmFREE); 1705 1706 jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", 1707 lsn, log->page, log->eor); 1708 1709 out: 1710 /* 1711 * shutdown per log i/o 1712 */ 1713 lbmLogShutdown(log); 1714 1715 if (rc) { 1716 jfs_warn("lmLogShutdown: exit(%d)", rc); 1717 } 1718 return rc; 1719 } 1720 1721 1722 /* 1723 * NAME: lmLogFileSystem() 1724 * 1725 * FUNCTION: insert (<activate> = true)/remove (<activate> = false) 1726 * file system into/from log active file system list. 1727 * 1728 * PARAMETE: log - pointer to logs inode. 1729 * fsdev - kdev_t of filesystem. 1730 * serial - pointer to returned log serial number 1731 * activate - insert/remove device from active list. 1732 * 1733 * RETURN: 0 - success 1734 * errors returned by vms_iowait(). 1735 */ 1736 static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, 1737 int activate) 1738 { 1739 int rc = 0; 1740 int i; 1741 struct logsuper *logsuper; 1742 struct lbuf *bpsuper; 1743 char *uuid = sbi->uuid; 1744 1745 /* 1746 * insert/remove file system device to log active file system list. 1747 */ 1748 if ((rc = lbmRead(log, 1, &bpsuper))) 1749 return rc; 1750 1751 logsuper = (struct logsuper *) bpsuper->l_ldata; 1752 if (activate) { 1753 for (i = 0; i < MAX_ACTIVE; i++) 1754 if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { 1755 memcpy(logsuper->active[i].uuid, uuid, 16); 1756 sbi->aggregate = i; 1757 break; 1758 } 1759 if (i == MAX_ACTIVE) { 1760 jfs_warn("Too many file systems sharing journal!"); 1761 lbmFree(bpsuper); 1762 return -EMFILE; /* Is there a better rc? */ 1763 } 1764 } else { 1765 for (i = 0; i < MAX_ACTIVE; i++) 1766 if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { 1767 memcpy(logsuper->active[i].uuid, NULL_UUID, 16); 1768 break; 1769 } 1770 if (i == MAX_ACTIVE) { 1771 jfs_warn("Somebody stomped on the journal!"); 1772 lbmFree(bpsuper); 1773 return -EIO; 1774 } 1775 1776 } 1777 1778 /* 1779 * synchronous write log superblock: 1780 * 1781 * write sidestream bypassing write queue: 1782 * at file system mount, log super block is updated for 1783 * activation of the file system before any log record 1784 * (MOUNT record) of the file system, and at file system 1785 * unmount, all meta data for the file system has been 1786 * flushed before log super block is updated for deactivation 1787 * of the file system. 1788 */ 1789 lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); 1790 rc = lbmIOWait(bpsuper, lbmFREE); 1791 1792 return rc; 1793 } 1794 1795 /* 1796 * log buffer manager (lbm) 1797 * ------------------------ 1798 * 1799 * special purpose buffer manager supporting log i/o requirements. 1800 * 1801 * per log write queue: 1802 * log pageout occurs in serial order by fifo write queue and 1803 * restricting to a single i/o in pregress at any one time. 1804 * a circular singly-linked list 1805 * (log->wrqueue points to the tail, and buffers are linked via 1806 * bp->wrqueue field), and 1807 * maintains log page in pageout ot waiting for pageout in serial pageout. 1808 */ 1809 1810 /* 1811 * lbmLogInit() 1812 * 1813 * initialize per log I/O setup at lmLogInit() 1814 */ 1815 static int lbmLogInit(struct jfs_log * log) 1816 { /* log inode */ 1817 int i; 1818 struct lbuf *lbuf; 1819 1820 jfs_info("lbmLogInit: log:0x%p", log); 1821 1822 /* initialize current buffer cursor */ 1823 log->bp = NULL; 1824 1825 /* initialize log device write queue */ 1826 log->wqueue = NULL; 1827 1828 /* 1829 * Each log has its own buffer pages allocated to it. These are 1830 * not managed by the page cache. This ensures that a transaction 1831 * writing to the log does not block trying to allocate a page from 1832 * the page cache (for the log). This would be bad, since page 1833 * allocation waits on the kswapd thread that may be committing inodes 1834 * which would cause log activity. Was that clear? I'm trying to 1835 * avoid deadlock here. 1836 */ 1837 init_waitqueue_head(&log->free_wait); 1838 1839 log->lbuf_free = NULL; 1840 1841 for (i = 0; i < LOGPAGES;) { 1842 char *buffer; 1843 uint offset; 1844 struct page *page; 1845 1846 buffer = (char *) get_zeroed_page(GFP_KERNEL); 1847 if (buffer == NULL) 1848 goto error; 1849 page = virt_to_page(buffer); 1850 for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { 1851 lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); 1852 if (lbuf == NULL) { 1853 if (offset == 0) 1854 free_page((unsigned long) buffer); 1855 goto error; 1856 } 1857 if (offset) /* we already have one reference */ 1858 get_page(page); 1859 lbuf->l_offset = offset; 1860 lbuf->l_ldata = buffer + offset; 1861 lbuf->l_page = page; 1862 lbuf->l_log = log; 1863 init_waitqueue_head(&lbuf->l_ioevent); 1864 1865 lbuf->l_freelist = log->lbuf_free; 1866 log->lbuf_free = lbuf; 1867 i++; 1868 } 1869 } 1870 1871 return (0); 1872 1873 error: 1874 lbmLogShutdown(log); 1875 return -ENOMEM; 1876 } 1877 1878 1879 /* 1880 * lbmLogShutdown() 1881 * 1882 * finalize per log I/O setup at lmLogShutdown() 1883 */ 1884 static void lbmLogShutdown(struct jfs_log * log) 1885 { 1886 struct lbuf *lbuf; 1887 1888 jfs_info("lbmLogShutdown: log:0x%p", log); 1889 1890 lbuf = log->lbuf_free; 1891 while (lbuf) { 1892 struct lbuf *next = lbuf->l_freelist; 1893 __free_page(lbuf->l_page); 1894 kfree(lbuf); 1895 lbuf = next; 1896 } 1897 } 1898 1899 1900 /* 1901 * lbmAllocate() 1902 * 1903 * allocate an empty log buffer 1904 */ 1905 static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) 1906 { 1907 struct lbuf *bp; 1908 unsigned long flags; 1909 1910 /* 1911 * recycle from log buffer freelist if any 1912 */ 1913 LCACHE_LOCK(flags); 1914 LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); 1915 log->lbuf_free = bp->l_freelist; 1916 LCACHE_UNLOCK(flags); 1917 1918 bp->l_flag = 0; 1919 1920 bp->l_wqnext = NULL; 1921 bp->l_freelist = NULL; 1922 1923 bp->l_pn = pn; 1924 bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); 1925 bp->l_ceor = 0; 1926 1927 return bp; 1928 } 1929 1930 1931 /* 1932 * lbmFree() 1933 * 1934 * release a log buffer to freelist 1935 */ 1936 static void lbmFree(struct lbuf * bp) 1937 { 1938 unsigned long flags; 1939 1940 LCACHE_LOCK(flags); 1941 1942 lbmfree(bp); 1943 1944 LCACHE_UNLOCK(flags); 1945 } 1946 1947 static void lbmfree(struct lbuf * bp) 1948 { 1949 struct jfs_log *log = bp->l_log; 1950 1951 assert(bp->l_wqnext == NULL); 1952 1953 /* 1954 * return the buffer to head of freelist 1955 */ 1956 bp->l_freelist = log->lbuf_free; 1957 log->lbuf_free = bp; 1958 1959 wake_up(&log->free_wait); 1960 return; 1961 } 1962 1963 1964 /* 1965 * NAME: lbmRedrive 1966 * 1967 * FUNCTION: add a log buffer to the log redrive list 1968 * 1969 * PARAMETER: 1970 * bp - log buffer 1971 * 1972 * NOTES: 1973 * Takes log_redrive_lock. 1974 */ 1975 static inline void lbmRedrive(struct lbuf *bp) 1976 { 1977 unsigned long flags; 1978 1979 spin_lock_irqsave(&log_redrive_lock, flags); 1980 bp->l_redrive_next = log_redrive_list; 1981 log_redrive_list = bp; 1982 spin_unlock_irqrestore(&log_redrive_lock, flags); 1983 1984 wake_up_process(jfsIOthread); 1985 } 1986 1987 1988 /* 1989 * lbmRead() 1990 */ 1991 static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) 1992 { 1993 struct bio *bio; 1994 struct lbuf *bp; 1995 1996 /* 1997 * allocate a log buffer 1998 */ 1999 *bpp = bp = lbmAllocate(log, pn); 2000 jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); 2001 2002 bp->l_flag |= lbmREAD; 2003 2004 bio = bio_alloc(GFP_NOFS, 1); 2005 2006 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); 2007 bio->bi_bdev = log->bdev; 2008 bio->bi_io_vec[0].bv_page = bp->l_page; 2009 bio->bi_io_vec[0].bv_len = LOGPSIZE; 2010 bio->bi_io_vec[0].bv_offset = bp->l_offset; 2011 2012 bio->bi_vcnt = 1; 2013 bio->bi_idx = 0; 2014 bio->bi_size = LOGPSIZE; 2015 2016 bio->bi_end_io = lbmIODone; 2017 bio->bi_private = bp; 2018 submit_bio(READ_SYNC, bio); 2019 2020 wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); 2021 2022 return 0; 2023 } 2024 2025 2026 /* 2027 * lbmWrite() 2028 * 2029 * buffer at head of pageout queue stays after completion of 2030 * partial-page pageout and redriven by explicit initiation of 2031 * pageout by caller until full-page pageout is completed and 2032 * released. 2033 * 2034 * device driver i/o done redrives pageout of new buffer at 2035 * head of pageout queue when current buffer at head of pageout 2036 * queue is released at the completion of its full-page pageout. 2037 * 2038 * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). 2039 * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() 2040 */ 2041 static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, 2042 int cant_block) 2043 { 2044 struct lbuf *tail; 2045 unsigned long flags; 2046 2047 jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); 2048 2049 /* map the logical block address to physical block address */ 2050 bp->l_blkno = 2051 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); 2052 2053 LCACHE_LOCK(flags); /* disable+lock */ 2054 2055 /* 2056 * initialize buffer for device driver 2057 */ 2058 bp->l_flag = flag; 2059 2060 /* 2061 * insert bp at tail of write queue associated with log 2062 * 2063 * (request is either for bp already/currently at head of queue 2064 * or new bp to be inserted at tail) 2065 */ 2066 tail = log->wqueue; 2067 2068 /* is buffer not already on write queue ? */ 2069 if (bp->l_wqnext == NULL) { 2070 /* insert at tail of wqueue */ 2071 if (tail == NULL) { 2072 log->wqueue = bp; 2073 bp->l_wqnext = bp; 2074 } else { 2075 log->wqueue = bp; 2076 bp->l_wqnext = tail->l_wqnext; 2077 tail->l_wqnext = bp; 2078 } 2079 2080 tail = bp; 2081 } 2082 2083 /* is buffer at head of wqueue and for write ? */ 2084 if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { 2085 LCACHE_UNLOCK(flags); /* unlock+enable */ 2086 return; 2087 } 2088 2089 LCACHE_UNLOCK(flags); /* unlock+enable */ 2090 2091 if (cant_block) 2092 lbmRedrive(bp); 2093 else if (flag & lbmSYNC) 2094 lbmStartIO(bp); 2095 else { 2096 LOGGC_UNLOCK(log); 2097 lbmStartIO(bp); 2098 LOGGC_LOCK(log); 2099 } 2100 } 2101 2102 2103 /* 2104 * lbmDirectWrite() 2105 * 2106 * initiate pageout bypassing write queue for sidestream 2107 * (e.g., log superblock) write; 2108 */ 2109 static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) 2110 { 2111 jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", 2112 bp, flag, bp->l_pn); 2113 2114 /* 2115 * initialize buffer for device driver 2116 */ 2117 bp->l_flag = flag | lbmDIRECT; 2118 2119 /* map the logical block address to physical block address */ 2120 bp->l_blkno = 2121 log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); 2122 2123 /* 2124 * initiate pageout of the page 2125 */ 2126 lbmStartIO(bp); 2127 } 2128 2129 2130 /* 2131 * NAME: lbmStartIO() 2132 * 2133 * FUNCTION: Interface to DD strategy routine 2134 * 2135 * RETURN: none 2136 * 2137 * serialization: LCACHE_LOCK() is NOT held during log i/o; 2138 */ 2139 static void lbmStartIO(struct lbuf * bp) 2140 { 2141 struct bio *bio; 2142 struct jfs_log *log = bp->l_log; 2143 2144 jfs_info("lbmStartIO\n"); 2145 2146 bio = bio_alloc(GFP_NOFS, 1); 2147 bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); 2148 bio->bi_bdev = log->bdev; 2149 bio->bi_io_vec[0].bv_page = bp->l_page; 2150 bio->bi_io_vec[0].bv_len = LOGPSIZE; 2151 bio->bi_io_vec[0].bv_offset = bp->l_offset; 2152 2153 bio->bi_vcnt = 1; 2154 bio->bi_idx = 0; 2155 bio->bi_size = LOGPSIZE; 2156 2157 bio->bi_end_io = lbmIODone; 2158 bio->bi_private = bp; 2159 2160 /* check if journaling to disk has been disabled */ 2161 if (log->no_integrity) { 2162 bio->bi_size = 0; 2163 lbmIODone(bio, 0); 2164 } else { 2165 submit_bio(WRITE_SYNC, bio); 2166 INCREMENT(lmStat.submitted); 2167 } 2168 } 2169 2170 2171 /* 2172 * lbmIOWait() 2173 */ 2174 static int lbmIOWait(struct lbuf * bp, int flag) 2175 { 2176 unsigned long flags; 2177 int rc = 0; 2178 2179 jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); 2180 2181 LCACHE_LOCK(flags); /* disable+lock */ 2182 2183 LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); 2184 2185 rc = (bp->l_flag & lbmERROR) ? -EIO : 0; 2186 2187 if (flag & lbmFREE) 2188 lbmfree(bp); 2189 2190 LCACHE_UNLOCK(flags); /* unlock+enable */ 2191 2192 jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); 2193 return rc; 2194 } 2195 2196 /* 2197 * lbmIODone() 2198 * 2199 * executed at INTIODONE level 2200 */ 2201 static void lbmIODone(struct bio *bio, int error) 2202 { 2203 struct lbuf *bp = bio->bi_private; 2204 struct lbuf *nextbp, *tail; 2205 struct jfs_log *log; 2206 unsigned long flags; 2207 2208 /* 2209 * get back jfs buffer bound to the i/o buffer 2210 */ 2211 jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); 2212 2213 LCACHE_LOCK(flags); /* disable+lock */ 2214 2215 bp->l_flag |= lbmDONE; 2216 2217 if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { 2218 bp->l_flag |= lbmERROR; 2219 2220 jfs_err("lbmIODone: I/O error in JFS log"); 2221 } 2222 2223 bio_put(bio); 2224 2225 /* 2226 * pagein completion 2227 */ 2228 if (bp->l_flag & lbmREAD) { 2229 bp->l_flag &= ~lbmREAD; 2230 2231 LCACHE_UNLOCK(flags); /* unlock+enable */ 2232 2233 /* wakeup I/O initiator */ 2234 LCACHE_WAKEUP(&bp->l_ioevent); 2235 2236 return; 2237 } 2238 2239 /* 2240 * pageout completion 2241 * 2242 * the bp at the head of write queue has completed pageout. 2243 * 2244 * if single-commit/full-page pageout, remove the current buffer 2245 * from head of pageout queue, and redrive pageout with 2246 * the new buffer at head of pageout queue; 2247 * otherwise, the partial-page pageout buffer stays at 2248 * the head of pageout queue to be redriven for pageout 2249 * by lmGroupCommit() until full-page pageout is completed. 2250 */ 2251 bp->l_flag &= ~lbmWRITE; 2252 INCREMENT(lmStat.pagedone); 2253 2254 /* update committed lsn */ 2255 log = bp->l_log; 2256 log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; 2257 2258 if (bp->l_flag & lbmDIRECT) { 2259 LCACHE_WAKEUP(&bp->l_ioevent); 2260 LCACHE_UNLOCK(flags); 2261 return; 2262 } 2263 2264 tail = log->wqueue; 2265 2266 /* single element queue */ 2267 if (bp == tail) { 2268 /* remove head buffer of full-page pageout 2269 * from log device write queue 2270 */ 2271 if (bp->l_flag & lbmRELEASE) { 2272 log->wqueue = NULL; 2273 bp->l_wqnext = NULL; 2274 } 2275 } 2276 /* multi element queue */ 2277 else { 2278 /* remove head buffer of full-page pageout 2279 * from log device write queue 2280 */ 2281 if (bp->l_flag & lbmRELEASE) { 2282 nextbp = tail->l_wqnext = bp->l_wqnext; 2283 bp->l_wqnext = NULL; 2284 2285 /* 2286 * redrive pageout of next page at head of write queue: 2287 * redrive next page without any bound tblk 2288 * (i.e., page w/o any COMMIT records), or 2289 * first page of new group commit which has been 2290 * queued after current page (subsequent pageout 2291 * is performed synchronously, except page without 2292 * any COMMITs) by lmGroupCommit() as indicated 2293 * by lbmWRITE flag; 2294 */ 2295 if (nextbp->l_flag & lbmWRITE) { 2296 /* 2297 * We can't do the I/O at interrupt time. 2298 * The jfsIO thread can do it 2299 */ 2300 lbmRedrive(nextbp); 2301 } 2302 } 2303 } 2304 2305 /* 2306 * synchronous pageout: 2307 * 2308 * buffer has not necessarily been removed from write queue 2309 * (e.g., synchronous write of partial-page with COMMIT): 2310 * leave buffer for i/o initiator to dispose 2311 */ 2312 if (bp->l_flag & lbmSYNC) { 2313 LCACHE_UNLOCK(flags); /* unlock+enable */ 2314 2315 /* wakeup I/O initiator */ 2316 LCACHE_WAKEUP(&bp->l_ioevent); 2317 } 2318 2319 /* 2320 * Group Commit pageout: 2321 */ 2322 else if (bp->l_flag & lbmGC) { 2323 LCACHE_UNLOCK(flags); 2324 lmPostGC(bp); 2325 } 2326 2327 /* 2328 * asynchronous pageout: 2329 * 2330 * buffer must have been removed from write queue: 2331 * insert buffer at head of freelist where it can be recycled 2332 */ 2333 else { 2334 assert(bp->l_flag & lbmRELEASE); 2335 assert(bp->l_flag & lbmFREE); 2336 lbmfree(bp); 2337 2338 LCACHE_UNLOCK(flags); /* unlock+enable */ 2339 } 2340 } 2341 2342 int jfsIOWait(void *arg) 2343 { 2344 struct lbuf *bp; 2345 2346 do { 2347 spin_lock_irq(&log_redrive_lock); 2348 while ((bp = log_redrive_list)) { 2349 log_redrive_list = bp->l_redrive_next; 2350 bp->l_redrive_next = NULL; 2351 spin_unlock_irq(&log_redrive_lock); 2352 lbmStartIO(bp); 2353 spin_lock_irq(&log_redrive_lock); 2354 } 2355 2356 if (freezing(current)) { 2357 spin_unlock_irq(&log_redrive_lock); 2358 refrigerator(); 2359 } else { 2360 set_current_state(TASK_INTERRUPTIBLE); 2361 spin_unlock_irq(&log_redrive_lock); 2362 schedule(); 2363 __set_current_state(TASK_RUNNING); 2364 } 2365 } while (!kthread_should_stop()); 2366 2367 jfs_info("jfsIOWait being killed!"); 2368 return 0; 2369 } 2370 2371 /* 2372 * NAME: lmLogFormat()/jfs_logform() 2373 * 2374 * FUNCTION: format file system log 2375 * 2376 * PARAMETERS: 2377 * log - volume log 2378 * logAddress - start address of log space in FS block 2379 * logSize - length of log space in FS block; 2380 * 2381 * RETURN: 0 - success 2382 * -EIO - i/o error 2383 * 2384 * XXX: We're synchronously writing one page at a time. This needs to 2385 * be improved by writing multiple pages at once. 2386 */ 2387 int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) 2388 { 2389 int rc = -EIO; 2390 struct jfs_sb_info *sbi; 2391 struct logsuper *logsuper; 2392 struct logpage *lp; 2393 int lspn; /* log sequence page number */ 2394 struct lrd *lrd_ptr; 2395 int npages = 0; 2396 struct lbuf *bp; 2397 2398 jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", 2399 (long long)logAddress, logSize); 2400 2401 sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); 2402 2403 /* allocate a log buffer */ 2404 bp = lbmAllocate(log, 1); 2405 2406 npages = logSize >> sbi->l2nbperpage; 2407 2408 /* 2409 * log space: 2410 * 2411 * page 0 - reserved; 2412 * page 1 - log superblock; 2413 * page 2 - log data page: A SYNC log record is written 2414 * into this page at logform time; 2415 * pages 3-N - log data page: set to empty log data pages; 2416 */ 2417 /* 2418 * init log superblock: log page 1 2419 */ 2420 logsuper = (struct logsuper *) bp->l_ldata; 2421 2422 logsuper->magic = cpu_to_le32(LOGMAGIC); 2423 logsuper->version = cpu_to_le32(LOGVERSION); 2424 logsuper->state = cpu_to_le32(LOGREDONE); 2425 logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ 2426 logsuper->size = cpu_to_le32(npages); 2427 logsuper->bsize = cpu_to_le32(sbi->bsize); 2428 logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); 2429 logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); 2430 2431 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; 2432 bp->l_blkno = logAddress + sbi->nbperpage; 2433 lbmStartIO(bp); 2434 if ((rc = lbmIOWait(bp, 0))) 2435 goto exit; 2436 2437 /* 2438 * init pages 2 to npages-1 as log data pages: 2439 * 2440 * log page sequence number (lpsn) initialization: 2441 * 2442 * pn: 0 1 2 3 n-1 2443 * +-----+-----+=====+=====+===.....===+=====+ 2444 * lspn: N-1 0 1 N-2 2445 * <--- N page circular file ----> 2446 * 2447 * the N (= npages-2) data pages of the log is maintained as 2448 * a circular file for the log records; 2449 * lpsn grows by 1 monotonically as each log page is written 2450 * to the circular file of the log; 2451 * and setLogpage() will not reset the page number even if 2452 * the eor is equal to LOGPHDRSIZE. In order for binary search 2453 * still work in find log end process, we have to simulate the 2454 * log wrap situation at the log format time. 2455 * The 1st log page written will have the highest lpsn. Then 2456 * the succeeding log pages will have ascending order of 2457 * the lspn starting from 0, ... (N-2) 2458 */ 2459 lp = (struct logpage *) bp->l_ldata; 2460 /* 2461 * initialize 1st log page to be written: lpsn = N - 1, 2462 * write a SYNCPT log record is written to this page 2463 */ 2464 lp->h.page = lp->t.page = cpu_to_le32(npages - 3); 2465 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); 2466 2467 lrd_ptr = (struct lrd *) &lp->data; 2468 lrd_ptr->logtid = 0; 2469 lrd_ptr->backchain = 0; 2470 lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); 2471 lrd_ptr->length = 0; 2472 lrd_ptr->log.syncpt.sync = 0; 2473 2474 bp->l_blkno += sbi->nbperpage; 2475 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; 2476 lbmStartIO(bp); 2477 if ((rc = lbmIOWait(bp, 0))) 2478 goto exit; 2479 2480 /* 2481 * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) 2482 */ 2483 for (lspn = 0; lspn < npages - 3; lspn++) { 2484 lp->h.page = lp->t.page = cpu_to_le32(lspn); 2485 lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); 2486 2487 bp->l_blkno += sbi->nbperpage; 2488 bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; 2489 lbmStartIO(bp); 2490 if ((rc = lbmIOWait(bp, 0))) 2491 goto exit; 2492 } 2493 2494 rc = 0; 2495 exit: 2496 /* 2497 * finalize log 2498 */ 2499 /* release the buffer */ 2500 lbmFree(bp); 2501 2502 return rc; 2503 } 2504 2505 #ifdef CONFIG_JFS_STATISTICS 2506 static int jfs_lmstats_proc_show(struct seq_file *m, void *v) 2507 { 2508 seq_printf(m, 2509 "JFS Logmgr stats\n" 2510 "================\n" 2511 "commits = %d\n" 2512 "writes submitted = %d\n" 2513 "writes completed = %d\n" 2514 "full pages submitted = %d\n" 2515 "partial pages submitted = %d\n", 2516 lmStat.commit, 2517 lmStat.submitted, 2518 lmStat.pagedone, 2519 lmStat.full_page, 2520 lmStat.partial_page); 2521 return 0; 2522 } 2523 2524 static int jfs_lmstats_proc_open(struct inode *inode, struct file *file) 2525 { 2526 return single_open(file, jfs_lmstats_proc_show, NULL); 2527 } 2528 2529 const struct file_operations jfs_lmstats_proc_fops = { 2530 .owner = THIS_MODULE, 2531 .open = jfs_lmstats_proc_open, 2532 .read = seq_read, 2533 .llseek = seq_lseek, 2534 .release = single_release, 2535 }; 2536 #endif /* CONFIG_JFS_STATISTICS */ 2537