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