diff options
Diffstat (limited to 'fs/jfs/jfs_logmgr.c')
| -rw-r--r-- | fs/jfs/jfs_logmgr.c | 2524 |
1 files changed, 2524 insertions, 0 deletions
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c new file mode 100644 index 0000000..b6a6869 --- /dev/null +++ b/fs/jfs/jfs_logmgr.c @@ -0,0 +1,2524 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* + * jfs_logmgr.c: log manager + * + * for related information, see transaction manager (jfs_txnmgr.c), and + * recovery manager (jfs_logredo.c). + * + * note: for detail, RTFS. + * + * log buffer manager: + * special purpose buffer manager supporting log i/o requirements. + * per log serial pageout of logpage + * queuing i/o requests and redrive i/o at iodone + * maintain current logpage buffer + * no caching since append only + * appropriate jfs buffer cache buffers as needed + * + * group commit: + * transactions which wrote COMMIT records in the same in-memory + * log page during the pageout of previous/current log page(s) are + * committed together by the pageout of the page. + * + * TBD lazy commit: + * transactions are committed asynchronously when the log page + * containing it COMMIT is paged out when it becomes full; + * + * serialization: + * . a per log lock serialize log write. + * . a per log lock serialize group commit. + * . a per log lock serialize log open/close; + * + * TBD log integrity: + * careful-write (ping-pong) of last logpage to recover from crash + * in overwrite. + * detection of split (out-of-order) write of physical sectors + * of last logpage via timestamp at end of each sector + * with its mirror data array at trailer). + * + * alternatives: + * lsn - 64-bit monotonically increasing integer vs + * 32-bit lspn and page eor. + */ + +#include <linux/fs.h> +#include <linux/blkdev.h> +#include <linux/interrupt.h> +#include <linux/smp_lock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> /* for sync_blockdev() */ +#include <linux/bio.h> +#include <linux/suspend.h> +#include <linux/delay.h> +#include "jfs_incore.h" +#include "jfs_filsys.h" +#include "jfs_metapage.h" +#include "jfs_txnmgr.h" +#include "jfs_debug.h" + + +/* + * lbuf's ready to be redriven. Protected by log_redrive_lock (jfsIO thread) + */ +static struct lbuf *log_redrive_list; +static DEFINE_SPINLOCK(log_redrive_lock); +DECLARE_WAIT_QUEUE_HEAD(jfs_IO_thread_wait); + + +/* + * log read/write serialization (per log) + */ +#define LOG_LOCK_INIT(log) init_MUTEX(&(log)->loglock) +#define LOG_LOCK(log) down(&((log)->loglock)) +#define LOG_UNLOCK(log) up(&((log)->loglock)) + + +/* + * log group commit serialization (per log) + */ + +#define LOGGC_LOCK_INIT(log) spin_lock_init(&(log)->gclock) +#define LOGGC_LOCK(log) spin_lock_irq(&(log)->gclock) +#define LOGGC_UNLOCK(log) spin_unlock_irq(&(log)->gclock) +#define LOGGC_WAKEUP(tblk) wake_up_all(&(tblk)->gcwait) + +/* + * log sync serialization (per log) + */ +#define LOGSYNC_DELTA(logsize) min((logsize)/8, 128*LOGPSIZE) +#define LOGSYNC_BARRIER(logsize) ((logsize)/4) +/* +#define LOGSYNC_DELTA(logsize) min((logsize)/4, 256*LOGPSIZE) +#define LOGSYNC_BARRIER(logsize) ((logsize)/2) +*/ + + +/* + * log buffer cache synchronization + */ +static DEFINE_SPINLOCK(jfsLCacheLock); + +#define LCACHE_LOCK(flags) spin_lock_irqsave(&jfsLCacheLock, flags) +#define LCACHE_UNLOCK(flags) spin_unlock_irqrestore(&jfsLCacheLock, flags) + +/* + * See __SLEEP_COND in jfs_locks.h + */ +#define LCACHE_SLEEP_COND(wq, cond, flags) \ +do { \ + if (cond) \ + break; \ + __SLEEP_COND(wq, cond, LCACHE_LOCK(flags), LCACHE_UNLOCK(flags)); \ +} while (0) + +#define LCACHE_WAKEUP(event) wake_up(event) + + +/* + * lbuf buffer cache (lCache) control + */ +/* log buffer manager pageout control (cumulative, inclusive) */ +#define lbmREAD 0x0001 +#define lbmWRITE 0x0002 /* enqueue at tail of write queue; + * init pageout if at head of queue; + */ +#define lbmRELEASE 0x0004 /* remove from write queue + * at completion of pageout; + * do not free/recycle it yet: + * caller will free it; + */ +#define lbmSYNC 0x0008 /* do not return to freelist + * when removed from write queue; + */ +#define lbmFREE 0x0010 /* return to freelist + * at completion of pageout; + * the buffer may be recycled; + */ +#define lbmDONE 0x0020 +#define lbmERROR 0x0040 +#define lbmGC 0x0080 /* lbmIODone to perform post-GC processing + * of log page + */ +#define lbmDIRECT 0x0100 + +/* + * Global list of active external journals + */ +static LIST_HEAD(jfs_external_logs); +static struct jfs_log *dummy_log = NULL; +static DECLARE_MUTEX(jfs_log_sem); + +/* + * external references + */ +extern void txLazyUnlock(struct tblock * tblk); +extern int jfs_stop_threads; +extern struct completion jfsIOwait; +extern int jfs_tlocks_low; + +/* + * forward references + */ +static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk, + struct lrd * lrd, struct tlock * tlck); + +static int lmNextPage(struct jfs_log * log); +static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, + int activate); + +static int open_inline_log(struct super_block *sb); +static int open_dummy_log(struct super_block *sb); +static int lbmLogInit(struct jfs_log * log); +static void lbmLogShutdown(struct jfs_log * log); +static struct lbuf *lbmAllocate(struct jfs_log * log, int); +static void lbmFree(struct lbuf * bp); +static void lbmfree(struct lbuf * bp); +static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp); +static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, int cant_block); +static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag); +static int lbmIOWait(struct lbuf * bp, int flag); +static bio_end_io_t lbmIODone; +static void lbmStartIO(struct lbuf * bp); +static void lmGCwrite(struct jfs_log * log, int cant_block); +static int lmLogSync(struct jfs_log * log, int nosyncwait); + + + +/* + * statistics + */ +#ifdef CONFIG_JFS_STATISTICS +static struct lmStat { + uint commit; /* # of commit */ + uint pagedone; /* # of page written */ + uint submitted; /* # of pages submitted */ + uint full_page; /* # of full pages submitted */ + uint partial_page; /* # of partial pages submitted */ +} lmStat; +#endif + + +/* + * NAME: lmLog() + * + * FUNCTION: write a log record; + * + * PARAMETER: + * + * RETURN: lsn - offset to the next log record to write (end-of-log); + * -1 - error; + * + * note: todo: log error handler + */ +int lmLog(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, + struct tlock * tlck) +{ + int lsn; + int diffp, difft; + struct metapage *mp = NULL; + + jfs_info("lmLog: log:0x%p tblk:0x%p, lrd:0x%p tlck:0x%p", + log, tblk, lrd, tlck); + + LOG_LOCK(log); + + /* log by (out-of-transaction) JFS ? */ + if (tblk == NULL) + goto writeRecord; + + /* log from page ? */ + if (tlck == NULL || + tlck->type & tlckBTROOT || (mp = tlck->mp) == NULL) + goto writeRecord; + + /* + * initialize/update page/transaction recovery lsn + */ + lsn = log->lsn; + + LOGSYNC_LOCK(log); + + /* + * initialize page lsn if first log write of the page + */ + if (mp->lsn == 0) { + mp->log = log; + mp->lsn = lsn; + log->count++; + + /* insert page at tail of logsynclist */ + list_add_tail(&mp->synclist, &log->synclist); + } + + /* + * initialize/update lsn of tblock of the page + * + * transaction inherits oldest lsn of pages associated + * with allocation/deallocation of resources (their + * log records are used to reconstruct allocation map + * at recovery time: inode for inode allocation map, + * B+-tree index of extent descriptors for block + * allocation map); + * allocation map pages inherit transaction lsn at + * commit time to allow forwarding log syncpt past log + * records associated with allocation/deallocation of + * resources only after persistent map of these map pages + * have been updated and propagated to home. + */ + /* + * initialize transaction lsn: + */ + if (tblk->lsn == 0) { + /* inherit lsn of its first page logged */ + tblk->lsn = mp->lsn; + log->count++; + + /* insert tblock after the page on logsynclist */ + list_add(&tblk->synclist, &mp->synclist); + } + /* + * update transaction lsn: + */ + else { + /* inherit oldest/smallest lsn of page */ + logdiff(diffp, mp->lsn, log); + logdiff(difft, tblk->lsn, log); + if (diffp < difft) { + /* update tblock lsn with page lsn */ + tblk->lsn = mp->lsn; + + /* move tblock after page on logsynclist */ + list_move(&tblk->synclist, &mp->synclist); + } + } + + LOGSYNC_UNLOCK(log); + + /* + * write the log record + */ + writeRecord: + lsn = lmWriteRecord(log, tblk, lrd, tlck); + + /* + * forward log syncpt if log reached next syncpt trigger + */ + logdiff(diffp, lsn, log); + if (diffp >= log->nextsync) + lsn = lmLogSync(log, 0); + + /* update end-of-log lsn */ + log->lsn = lsn; + + LOG_UNLOCK(log); + + /* return end-of-log address */ + return lsn; +} + + +/* + * NAME: lmWriteRecord() + * + * FUNCTION: move the log record to current log page + * + * PARAMETER: cd - commit descriptor + * + * RETURN: end-of-log address + * + * serialization: LOG_LOCK() held on entry/exit + */ +static int +lmWriteRecord(struct jfs_log * log, struct tblock * tblk, struct lrd * lrd, + struct tlock * tlck) +{ + int lsn = 0; /* end-of-log address */ + struct lbuf *bp; /* dst log page buffer */ + struct logpage *lp; /* dst log page */ + caddr_t dst; /* destination address in log page */ + int dstoffset; /* end-of-log offset in log page */ + int freespace; /* free space in log page */ + caddr_t p; /* src meta-data page */ + caddr_t src; + int srclen; + int nbytes; /* number of bytes to move */ + int i; + int len; + struct linelock *linelock; + struct lv *lv; + struct lvd *lvd; + int l2linesize; + + len = 0; + + /* retrieve destination log page to write */ + bp = (struct lbuf *) log->bp; + lp = (struct logpage *) bp->l_ldata; + dstoffset = log->eor; + + /* any log data to write ? */ + if (tlck == NULL) + goto moveLrd; + + /* + * move log record data + */ + /* retrieve source meta-data page to log */ + if (tlck->flag & tlckPAGELOCK) { + p = (caddr_t) (tlck->mp->data); + linelock = (struct linelock *) & tlck->lock; + } + /* retrieve source in-memory inode to log */ + else if (tlck->flag & tlckINODELOCK) { + if (tlck->type & tlckDTREE) + p = (caddr_t) &JFS_IP(tlck->ip)->i_dtroot; + else + p = (caddr_t) &JFS_IP(tlck->ip)->i_xtroot; + linelock = (struct linelock *) & tlck->lock; + } +#ifdef _JFS_WIP + else if (tlck->flag & tlckINLINELOCK) { + + inlinelock = (struct inlinelock *) & tlck; + p = (caddr_t) & inlinelock->pxd; + linelock = (struct linelock *) & tlck; + } +#endif /* _JFS_WIP */ + else { + jfs_err("lmWriteRecord: UFO tlck:0x%p", tlck); + return 0; /* Probably should trap */ + } + l2linesize = linelock->l2linesize; + + moveData: + ASSERT(linelock->index <= linelock->maxcnt); + + lv = linelock->lv; + for (i = 0; i < linelock->index; i++, lv++) { + if (lv->length == 0) + continue; + + /* is page full ? */ + if (dstoffset >= LOGPSIZE - LOGPTLRSIZE) { + /* page become full: move on to next page */ + lmNextPage(log); + + bp = log->bp; + lp = (struct logpage *) bp->l_ldata; + dstoffset = LOGPHDRSIZE; + } + + /* + * move log vector data + */ + src = (u8 *) p + (lv->offset << l2linesize); + srclen = lv->length << l2linesize; + len += srclen; + while (srclen > 0) { + freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; + nbytes = min(freespace, srclen); + dst = (caddr_t) lp + dstoffset; + memcpy(dst, src, nbytes); + dstoffset += nbytes; + + /* is page not full ? */ + if (dstoffset < LOGPSIZE - LOGPTLRSIZE) + break; + + /* page become full: move on to next page */ + lmNextPage(log); + + bp = (struct lbuf *) log->bp; + lp = (struct logpage *) bp->l_ldata; + dstoffset = LOGPHDRSIZE; + + srclen -= nbytes; + src += nbytes; + } + + /* + * move log vector descriptor + */ + len += 4; + lvd = (struct lvd *) ((caddr_t) lp + dstoffset); + lvd->offset = cpu_to_le16(lv->offset); + lvd->length = cpu_to_le16(lv->length); + dstoffset += 4; + jfs_info("lmWriteRecord: lv offset:%d length:%d", + lv->offset, lv->length); + } + + if ((i = linelock->next)) { + linelock = (struct linelock *) lid_to_tlock(i); + goto moveData; + } + + /* + * move log record descriptor + */ + moveLrd: + lrd->length = cpu_to_le16(len); + + src = (caddr_t) lrd; + srclen = LOGRDSIZE; + + while (srclen > 0) { + freespace = (LOGPSIZE - LOGPTLRSIZE) - dstoffset; + nbytes = min(freespace, srclen); + dst = (caddr_t) lp + dstoffset; + memcpy(dst, src, nbytes); + + dstoffset += nbytes; + srclen -= nbytes; + + /* are there more to move than freespace of page ? */ + if (srclen) + goto pageFull; + + /* + * end of log record descriptor + */ + + /* update last log record eor */ + log->eor = dstoffset; + bp->l_eor = dstoffset; + lsn = (log->page << L2LOGPSIZE) + dstoffset; + + if (lrd->type & cpu_to_le16(LOG_COMMIT)) { + tblk->clsn = lsn; + jfs_info("wr: tclsn:0x%x, beor:0x%x", tblk->clsn, + bp->l_eor); + + INCREMENT(lmStat.commit); /* # of commit */ + + /* + * enqueue tblock for group commit: + * + * enqueue tblock of non-trivial/synchronous COMMIT + * at tail of group commit queue + * (trivial/asynchronous COMMITs are ignored by + * group commit.) + */ + LOGGC_LOCK(log); + + /* init tblock gc state */ + tblk->flag = tblkGC_QUEUE; + tblk->bp = log->bp; + tblk->pn = log->page; + tblk->eor = log->eor; + + /* enqueue transaction to commit queue */ + list_add_tail(&tblk->cqueue, &log->cqueue); + + LOGGC_UNLOCK(log); + } + + jfs_info("lmWriteRecord: lrd:0x%04x bp:0x%p pn:%d eor:0x%x", + le16_to_cpu(lrd->type), log->bp, log->page, dstoffset); + + /* page not full ? */ + if (dstoffset < LOGPSIZE - LOGPTLRSIZE) + return lsn; + + pageFull: + /* page become full: move on to next page */ + lmNextPage(log); + + bp = (struct lbuf *) log->bp; + lp = (struct logpage *) bp->l_ldata; + dstoffset = LOGPHDRSIZE; + src += nbytes; + } + + return lsn; +} + + +/* + * NAME: lmNextPage() + * + * FUNCTION: write current page and allocate next page. + * + * PARAMETER: log + * + * RETURN: 0 + * + * serialization: LOG_LOCK() held on entry/exit + */ +static int lmNextPage(struct jfs_log * log) +{ + struct logpage *lp; + int lspn; /* log sequence page number */ + int pn; /* current page number */ + struct lbuf *bp; + struct lbuf *nextbp; + struct tblock *tblk; + + /* get current log page number and log sequence page number */ + pn = log->page; + bp = log->bp; + lp = (struct logpage *) bp->l_ldata; + lspn = le32_to_cpu(lp->h.page); + + LOGGC_LOCK(log); + + /* + * write or queue the full page at the tail of write queue + */ + /* get the tail tblk on commit queue */ + if (list_empty(&log->cqueue)) + tblk = NULL; + else + tblk = list_entry(log->cqueue.prev, struct tblock, cqueue); + + /* every tblk who has COMMIT record on the current page, + * and has not been committed, must be on commit queue + * since tblk is queued at commit queueu at the time + * of writing its COMMIT record on the page before + * page becomes full (even though the tblk thread + * who wrote COMMIT record may have been suspended + * currently); + */ + + /* is page bound with outstanding tail tblk ? */ + if (tblk && tblk->pn == pn) { + /* mark tblk for end-of-page */ + tblk->flag |= tblkGC_EOP; + + if (log->cflag & logGC_PAGEOUT) { + /* if page is not already on write queue, + * just enqueue (no lbmWRITE to prevent redrive) + * buffer to wqueue to ensure correct serial order + * of the pages since log pages will be added + * continuously + */ + if (bp->l_wqnext == NULL) + lbmWrite(log, bp, 0, 0); + } else { + /* + * No current GC leader, initiate group commit + */ + log->cflag |= logGC_PAGEOUT; + lmGCwrite(log, 0); + } + } + /* page is not bound with outstanding tblk: + * init write or mark it to be redriven (lbmWRITE) + */ + else { + /* finalize the page */ + bp->l_ceor = bp->l_eor; + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); + lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, 0); + } + LOGGC_UNLOCK(log); + + /* + * allocate/initialize next page + */ + /* if log wraps, the first data page of log is 2 + * (0 never used, 1 is superblock). + */ + log->page = (pn == log->size - 1) ? 2 : pn + 1; + log->eor = LOGPHDRSIZE; /* ? valid page empty/full at logRedo() */ + + /* allocate/initialize next log page buffer */ + nextbp = lbmAllocate(log, log->page); + nextbp->l_eor = log->eor; + log->bp = nextbp; + + /* initialize next log page */ + lp = (struct logpage *) nextbp->l_ldata; + lp->h.page = lp->t.page = cpu_to_le32(lspn + 1); + lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); + + return 0; +} + + +/* + * NAME: lmGroupCommit() + * + * FUNCTION: group commit + * initiate pageout of the pages with COMMIT in the order of + * page number - redrive pageout of the page at the head of + * pageout queue until full page has been written. + * + * RETURN: + * + * NOTE: + * LOGGC_LOCK serializes log group commit queue, and + * transaction blocks on the commit queue. + * N.B. LOG_LOCK is NOT held during lmGroupCommit(). + */ +int lmGroupCommit(struct jfs_log * log, struct tblock * tblk) +{ + int rc = 0; + + LOGGC_LOCK(log); + + /* group committed already ? */ + if (tblk->flag & tblkGC_COMMITTED) { + if (tblk->flag & tblkGC_ERROR) + rc = -EIO; + + LOGGC_UNLOCK(log); + return rc; + } + jfs_info("lmGroup Commit: tblk = 0x%p, gcrtc = %d", tblk, log->gcrtc); + + if (tblk->xflag & COMMIT_LAZY) + tblk->flag |= tblkGC_LAZY; + + if ((!(log->cflag & logGC_PAGEOUT)) && (!list_empty(&log->cqueue)) && + (!(tblk->xflag & COMMIT_LAZY) || test_bit(log_FLUSH, &log->flag) + || jfs_tlocks_low)) { + /* + * No pageout in progress + * + * start group commit as its group leader. + */ + log->cflag |= logGC_PAGEOUT; + + lmGCwrite(log, 0); + } + + if (tblk->xflag & COMMIT_LAZY) { + /* + * Lazy transactions can leave now + */ + LOGGC_UNLOCK(log); + return 0; + } + + /* lmGCwrite gives up LOGGC_LOCK, check again */ + + if (tblk->flag & tblkGC_COMMITTED) { + if (tblk->flag & tblkGC_ERROR) + rc = -EIO; + + LOGGC_UNLOCK(log); + return rc; + } + + /* upcount transaction waiting for completion + */ + log->gcrtc++; + tblk->flag |= tblkGC_READY; + + __SLEEP_COND(tblk->gcwait, (tblk->flag & tblkGC_COMMITTED), + LOGGC_LOCK(log), LOGGC_UNLOCK(log)); + + /* removed from commit queue */ + if (tblk->flag & tblkGC_ERROR) + rc = -EIO; + + LOGGC_UNLOCK(log); + return rc; +} + +/* + * NAME: lmGCwrite() + * + * FUNCTION: group commit write + * initiate write of log page, building a group of all transactions + * with commit records on that page. + * + * RETURN: None + * + * NOTE: + * LOGGC_LOCK must be held by caller. + * N.B. LOG_LOCK is NOT held during lmGroupCommit(). + */ +static void lmGCwrite(struct jfs_log * log, int cant_write) +{ + struct lbuf *bp; + struct logpage *lp; + int gcpn; /* group commit page number */ + struct tblock *tblk; + struct tblock *xtblk = NULL; + + /* + * build the commit group of a log page + * + * scan commit queue and make a commit group of all + * transactions with COMMIT records on the same log page. + */ + /* get the head tblk on the commit queue */ + gcpn = list_entry(log->cqueue.next, struct tblock, cqueue)->pn; + + list_for_each_entry(tblk, &log->cqueue, cqueue) { + if (tblk->pn != gcpn) + break; + + xtblk = tblk; + + /* state transition: (QUEUE, READY) -> COMMIT */ + tblk->flag |= tblkGC_COMMIT; + } + tblk = xtblk; /* last tblk of the page */ + + /* + * pageout to commit transactions on the log page. + */ + bp = (struct lbuf *) tblk->bp; + lp = (struct logpage *) bp->l_ldata; + /* is page already full ? */ + if (tblk->flag & tblkGC_EOP) { + /* mark page to free at end of group commit of the page */ + tblk->flag &= ~tblkGC_EOP; + tblk->flag |= tblkGC_FREE; + bp->l_ceor = bp->l_eor; + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); + lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmGC, + cant_write); + INCREMENT(lmStat.full_page); + } + /* page is not yet full */ + else { + bp->l_ceor = tblk->eor; /* ? bp->l_ceor = bp->l_eor; */ + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_ceor); + lbmWrite(log, bp, lbmWRITE | lbmGC, cant_write); + INCREMENT(lmStat.partial_page); + } +} + +/* + * NAME: lmPostGC() + * + * FUNCTION: group commit post-processing + * Processes transactions after their commit records have been written + * to disk, redriving log I/O if necessary. + * + * RETURN: None + * + * NOTE: + * This routine is called a interrupt time by lbmIODone + */ +static void lmPostGC(struct lbuf * bp) +{ + unsigned long flags; + struct jfs_log *log = bp->l_log; + struct logpage *lp; + struct tblock *tblk, *temp; + + //LOGGC_LOCK(log); + spin_lock_irqsave(&log->gclock, flags); + /* + * current pageout of group commit completed. + * + * remove/wakeup transactions from commit queue who were + * group committed with the current log page + */ + list_for_each_entry_safe(tblk, temp, &log->cqueue, cqueue) { + if (!(tblk->flag & tblkGC_COMMIT)) + break; + /* if transaction was marked GC_COMMIT then + * it has been shipped in the current pageout + * and made it to disk - it is committed. + */ + + if (bp->l_flag & lbmERROR) + tblk->flag |= tblkGC_ERROR; + + /* remove it from the commit queue */ + list_del(&tblk->cqueue); + tblk->flag &= ~tblkGC_QUEUE; + + if (tblk == log->flush_tblk) { + /* we can stop flushing the log now */ + clear_bit(log_FLUSH, &log->flag); + log->flush_tblk = NULL; + } + + jfs_info("lmPostGC: tblk = 0x%p, flag = 0x%x", tblk, + tblk->flag); + + if (!(tblk->xflag & COMMIT_FORCE)) + /* + * Hand tblk over to lazy commit thread + */ + txLazyUnlock(tblk); + else { + /* state transition: COMMIT -> COMMITTED */ + tblk->flag |= tblkGC_COMMITTED; + + if (tblk->flag & tblkGC_READY) + log->gcrtc--; + + LOGGC_WAKEUP(tblk); + } + + /* was page full before pageout ? + * (and this is the last tblk bound with the page) + */ + if (tblk->flag & tblkGC_FREE) + lbmFree(bp); + /* did page become full after pageout ? + * (and this is the last tblk bound with the page) + */ + else if (tblk->flag & tblkGC_EOP) { + /* finalize the page */ + lp = (struct logpage *) bp->l_ldata; + bp->l_ceor = bp->l_eor; + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); + jfs_info("lmPostGC: calling lbmWrite"); + lbmWrite(log, bp, lbmWRITE | lbmRELEASE | lbmFREE, + 1); + } + + } + + /* are there any transactions who have entered lnGroupCommit() + * (whose COMMITs are after that of the last log page written. + * They are waiting for new group commit (above at (SLEEP 1)) + * or lazy transactions are on a full (queued) log page, + * select the latest ready transaction as new group leader and + * wake her up to lead her group. + */ + if ((!list_empty(&log->cqueue)) && + ((log->gcrtc > 0) || (tblk->bp->l_wqnext != NULL) || + test_bit(log_FLUSH, &log->flag) || jfs_tlocks_low)) + /* + * Call lmGCwrite with new group leader + */ + lmGCwrite(log, 1); + + /* no transaction are ready yet (transactions are only just + * queued (GC_QUEUE) and not entered for group commit yet). + * the first transaction entering group commit + * will elect herself as new group leader. + */ + else + log->cflag &= ~logGC_PAGEOUT; + + //LOGGC_UNLOCK(log); + spin_unlock_irqrestore(&log->gclock, flags); + return; +} + +/* + * NAME: lmLogSync() + * + * FUNCTION: write log SYNCPT record for specified log + * if new sync address is available + * (normally the case if sync() is executed by back-ground + * process). + * if not, explicitly run jfs_blogsync() to initiate + * getting of new sync address. + * calculate new value of i_nextsync which determines when + * this code is called again. + * + * this is called only from lmLog(). + * + * PARAMETER: ip - pointer to logs inode. + * + * RETURN: 0 + * + * serialization: LOG_LOCK() held on entry/exit + */ +static int lmLogSync(struct jfs_log * log, int nosyncwait) +{ + int logsize; + int written; /* written since last syncpt */ + int free; /* free space left available */ + int delta; /* additional delta to write normally */ + int more; /* additional write granted */ + struct lrd lrd; + int lsn; + struct logsyncblk *lp; + + /* + * forward syncpt + */ + /* if last sync is same as last syncpt, + * invoke sync point forward processing to update sync. + */ + + if (log->sync == log->syncpt) { + LOGSYNC_LOCK(log); + /* ToDo: push dirty metapages out to disk */ +// bmLogSync(log); + + if (list_empty(&log->synclist)) + log->sync = log->lsn; + else { + lp = list_entry(log->synclist.next, + struct logsyncblk, synclist); + log->sync = lp->lsn; + } + LOGSYNC_UNLOCK(log); + + } + + /* if sync is different from last syncpt, + * write a SYNCPT record with syncpt = sync. + * reset syncpt = sync + */ + if (log->sync != log->syncpt) { + struct jfs_sb_info *sbi; + + /* + * We need to make sure all of the "written" metapages + * actually make it to disk + */ + list_for_each_entry(sbi, &log->sb_list, log_list) { + if (sbi->flag & JFS_NOINTEGRITY) + continue; + filemap_fdatawrite(sbi->ipbmap->i_mapping); + filemap_fdatawrite(sbi->ipimap->i_mapping); + filemap_fdatawrite(sbi->sb->s_bdev->bd_inode->i_mapping); + } + list_for_each_entry(sbi, &log->sb_list, log_list) { + if (sbi->flag & JFS_NOINTEGRITY) + continue; + filemap_fdatawait(sbi->ipbmap->i_mapping); + filemap_fdatawait(sbi->ipimap->i_mapping); + filemap_fdatawait(sbi->sb->s_bdev->bd_inode->i_mapping); + } + + lrd.logtid = 0; + lrd.backchain = 0; + lrd.type = cpu_to_le16(LOG_SYNCPT); + lrd.length = 0; + lrd.log.syncpt.sync = cpu_to_le32(log->sync); + lsn = lmWriteRecord(log, NULL, &lrd, NULL); + + log->syncpt = log->sync; + } else + lsn = log->lsn; + + /* + * setup next syncpt trigger (SWAG) + */ + logsize = log->logsize; + + logdiff(written, lsn, log); + free = logsize - written; + delta = LOGSYNC_DELTA(logsize); + more = min(free / 2, delta); + if (more < 2 * LOGPSIZE) { + jfs_warn("\n ... Log Wrap ... Log Wrap ... Log Wrap ...\n"); + /* + * log wrapping + * + * option 1 - panic ? No.! + * option 2 - shutdown file systems + * associated with log ? + * option 3 - extend log ? + */ + /* + * option 4 - second chance + * + * mark log wrapped, and continue. + * when all active transactions are completed, + * mark log vaild for recovery. + * if crashed during invalid state, log state + * implies invald log, forcing fsck(). + */ + /* mark log state log wrap in log superblock */ + /* log->state = LOGWRAP; */ + + /* reset sync point computation */ + log->syncpt = log->sync = lsn; + log->nextsync = delta; + } else + /* next syncpt trigger = written + more */ + log->nextsync = written + more; + + /* return if lmLogSync() from outside of transaction, e.g., sync() */ + if (nosyncwait) + return lsn; + + /* if number of bytes written from last sync point is more + * than 1/4 of the log size, stop new transactions from + * starting until all current transactions are completed + * by setting syncbarrier flag. + */ + if (written > LOGSYNC_BARRIER(logsize) && logsize > 32 * LOGPSIZE) { + set_bit(log_SYNCBARRIER, &log->flag); + jfs_info("log barrier on: lsn=0x%x syncpt=0x%x", lsn, + log->syncpt); + /* + * We may have to initiate group commit + */ + jfs_flush_journal(log, 0); + } + + return lsn; +} + + +/* + * NAME: lmLogOpen() + * + * FUNCTION: open the log on first open; + * insert filesystem in the active list of the log. + * + * PARAMETER: ipmnt - file system mount inode + * iplog - log inode (out) + * + * RETURN: + * + * serialization: + */ +int lmLogOpen(struct super_block *sb) +{ + int rc; + struct block_device *bdev; + struct jfs_log *log; + struct jfs_sb_info *sbi = JFS_SBI(sb); + + if (sbi->flag & JFS_NOINTEGRITY) + return open_dummy_log(sb); + + if (sbi->mntflag & JFS_INLINELOG) + return open_inline_log(sb); + + down(&jfs_log_sem); + list_for_each_entry(log, &jfs_external_logs, journal_list) { + if (log->bdev->bd_dev == sbi->logdev) { + if (memcmp(log->uuid, sbi->loguuid, + sizeof(log->uuid))) { + jfs_warn("wrong uuid on JFS journal\n"); + up(&jfs_log_sem); + return -EINVAL; + } + /* + * add file system to log active file system list + */ + if ((rc = lmLogFileSystem(log, sbi, 1))) { + up(&jfs_log_sem); + return rc; + } + goto journal_found; + } + } + + if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL))) { + up(&jfs_log_sem); + return -ENOMEM; + } + memset(log, 0, sizeof(struct jfs_log)); + INIT_LIST_HEAD(&log->sb_list); + init_waitqueue_head(&log->syncwait); + + /* + * external log as separate logical volume + * + * file systems to log may have n-to-1 relationship; + */ + + bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE); + if (IS_ERR(bdev)) { + rc = -PTR_ERR(bdev); + goto free; + } + + if ((rc = bd_claim(bdev, log))) { + goto close; + } + + log->bdev = bdev; + memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid)); + + /* + * initialize log: + */ + if ((rc = lmLogInit(log))) + goto unclaim; + + list_add(&log->journal_list, &jfs_external_logs); + + /* + * add file system to log active file system list + */ + if ((rc = lmLogFileSystem(log, sbi, 1))) + goto shutdown; + +journal_found: + LOG_LOCK(log); + list_add(&sbi->log_list, &log->sb_list); + sbi->log = log; + LOG_UNLOCK(log); + + up(&jfs_log_sem); + return 0; + + /* + * unwind on error + */ + shutdown: /* unwind lbmLogInit() */ + list_del(&log->journal_list); + lbmLogShutdown(log); + + unclaim: + bd_release(bdev); + + close: /* close external log device */ + blkdev_put(bdev); + + free: /* free log descriptor */ + up(&jfs_log_sem); + kfree(log); + + jfs_warn("lmLogOpen: exit(%d)", rc); + return rc; +} + +static int open_inline_log(struct super_block *sb) +{ + struct jfs_log *log; + int rc; + + if (!(log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL))) + return -ENOMEM; + memset(log, 0, sizeof(struct jfs_log)); + INIT_LIST_HEAD(&log->sb_list); + init_waitqueue_head(&log->syncwait); + + set_bit(log_INLINELOG, &log->flag); + log->bdev = sb->s_bdev; + log->base = addressPXD(&JFS_SBI(sb)->logpxd); + log->size = lengthPXD(&JFS_SBI(sb)->logpxd) >> + (L2LOGPSIZE - sb->s_blocksize_bits); + log->l2bsize = sb->s_blocksize_bits; + ASSERT(L2LOGPSIZE >= sb->s_blocksize_bits); + + /* + * initialize log. + */ + if ((rc = lmLogInit(log))) { + kfree(log); + jfs_warn("lmLogOpen: exit(%d)", rc); + return rc; + } + + list_add(&JFS_SBI(sb)->log_list, &log->sb_list); + JFS_SBI(sb)->log = log; + + return rc; +} + +static int open_dummy_log(struct super_block *sb) +{ + int rc; + + down(&jfs_log_sem); + if (!dummy_log) { + dummy_log = kmalloc(sizeof(struct jfs_log), GFP_KERNEL); + if (!dummy_log) { + up(&jfs_log_sem); + return -ENOMEM; + } + memset(dummy_log, 0, sizeof(struct jfs_log)); + INIT_LIST_HEAD(&dummy_log->sb_list); + init_waitqueue_head(&dummy_log->syncwait); + dummy_log->no_integrity = 1; + /* Make up some stuff */ + dummy_log->base = 0; + dummy_log->size = 1024; + rc = lmLogInit(dummy_log); + if (rc) { + kfree(dummy_log); + dummy_log = NULL; + up(&jfs_log_sem); + return rc; + } + } + + LOG_LOCK(dummy_log); + list_add(&JFS_SBI(sb)->log_list, &dummy_log->sb_list); + JFS_SBI(sb)->log = dummy_log; + LOG_UNLOCK(dummy_log); + up(&jfs_log_sem); + + return 0; +} + +/* + * NAME: lmLogInit() + * + * FUNCTION: log initialization at first log open. + * + * logredo() (or logformat()) should have been run previously. + * initialize the log from log superblock. + * set the log state in the superblock to LOGMOUNT and + * write SYNCPT log record. + * + * PARAMETER: log - log structure + * + * RETURN: 0 - if ok + * -EINVAL - bad log magic number or superblock dirty + * error returned from logwait() + * + * serialization: single first open thread + */ +int lmLogInit(struct jfs_log * log) +{ + int rc = 0; + struct lrd lrd; + struct logsuper *logsuper; + struct lbuf *bpsuper; + struct lbuf *bp; + struct logpage *lp; + int lsn = 0; + + jfs_info("lmLogInit: log:0x%p", log); + + /* initialize the group commit serialization lock */ + LOGGC_LOCK_INIT(log); + + /* allocate/initialize the log write serialization lock */ + LOG_LOCK_INIT(log); + + LOGSYNC_LOCK_INIT(log); + + INIT_LIST_HEAD(&log->synclist); + + INIT_LIST_HEAD(&log->cqueue); + log->flush_tblk = NULL; + + log->count = 0; + + /* + * initialize log i/o + */ + if ((rc = lbmLogInit(log))) + return rc; + + if (!test_bit(log_INLINELOG, &log->flag)) + log->l2bsize = L2LOGPSIZE; + + /* check for disabled journaling to disk */ + if (log->no_integrity) { + /* + * Journal pages will still be filled. When the time comes + * to actually do the I/O, the write is not done, and the + * endio routine is called directly. + */ + bp = lbmAllocate(log , 0); + log->bp = bp; + bp->l_pn = bp->l_eor = 0; + } else { + /* + * validate log superblock + */ + if ((rc = lbmRead(log, 1, &bpsuper))) + goto errout10; + + logsuper = (struct logsuper *) bpsuper->l_ldata; + + if (logsuper->magic != cpu_to_le32(LOGMAGIC)) { + jfs_warn("*** Log Format Error ! ***"); + rc = -EINVAL; + goto errout20; + } + + /* logredo() should have been run successfully. */ + if (logsuper->state != cpu_to_le32(LOGREDONE)) { + jfs_warn("*** Log Is Dirty ! ***"); + rc = -EINVAL; + goto errout20; + } + + /* initialize log from log superblock */ + if (test_bit(log_INLINELOG,&log->flag)) { + if (log->size != le32_to_cpu(logsuper->size)) { + rc = -EINVAL; + goto errout20; + } + jfs_info("lmLogInit: inline log:0x%p base:0x%Lx " + "size:0x%x", log, + (unsigned long long) log->base, log->size); + } else { + if (memcmp(logsuper->uuid, log->uuid, 16)) { + jfs_warn("wrong uuid on JFS log device"); + goto errout20; + } + log->size = le32_to_cpu(logsuper->size); + log->l2bsize = le32_to_cpu(logsuper->l2bsize); + jfs_info("lmLogInit: external log:0x%p base:0x%Lx " + "size:0x%x", log, + (unsigned long long) log->base, log->size); + } + + log->page = le32_to_cpu(logsuper->end) / LOGPSIZE; + log->eor = le32_to_cpu(logsuper->end) - (LOGPSIZE * log->page); + + /* + * initialize for log append write mode + */ + /* establish current/end-of-log page/buffer */ + if ((rc = lbmRead(log, log->page, &bp))) + goto errout20; + + lp = (struct logpage *) bp->l_ldata; + + jfs_info("lmLogInit: lsn:0x%x page:%d eor:%d:%d", + le32_to_cpu(logsuper->end), log->page, log->eor, + le16_to_cpu(lp->h.eor)); + + log->bp = bp; + bp->l_pn = log->page; + bp->l_eor = log->eor; + + /* if current page is full, move on to next page */ + if (log->eor >= LOGPSIZE - LOGPTLRSIZE) + lmNextPage(log); + + /* + * initialize log syncpoint + */ + /* + * write the first SYNCPT record with syncpoint = 0 + * (i.e., log redo up to HERE !); + * remove current page from lbm write queue at end of pageout + * (to write log superblock update), but do not release to + * freelist; + */ + lrd.logtid = 0; + lrd.backchain = 0; + lrd.type = cpu_to_le16(LOG_SYNCPT); + lrd.length = 0; + lrd.log.syncpt.sync = 0; + lsn = lmWriteRecord(log, NULL, &lrd, NULL); + bp = log->bp; + bp->l_ceor = bp->l_eor; + lp = (struct logpage *) bp->l_ldata; + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); + lbmWrite(log, bp, lbmWRITE | lbmSYNC, 0); + if ((rc = lbmIOWait(bp, 0))) + goto errout30; + + /* + * update/write superblock + */ + logsuper->state = cpu_to_le32(LOGMOUNT); + log->serial = le32_to_cpu(logsuper->serial) + 1; + logsuper->serial = cpu_to_le32(log->serial); + lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); + if ((rc = lbmIOWait(bpsuper, lbmFREE))) + goto errout30; + } + + /* initialize logsync parameters */ + log->logsize = (log->size - 2) << L2LOGPSIZE; + log->lsn = lsn; + log->syncpt = lsn; + log->sync = log->syncpt; + log->nextsync = LOGSYNC_DELTA(log->logsize); + + jfs_info("lmLogInit: lsn:0x%x syncpt:0x%x sync:0x%x", + log->lsn, log->syncpt, log->sync); + + /* + * initialize for lazy/group commit + */ + log->clsn = lsn; + + return 0; + + /* + * unwind on error + */ + errout30: /* release log page */ + log->wqueue = NULL; + bp->l_wqnext = NULL; + lbmFree(bp); + + errout20: /* release log superblock */ + lbmFree(bpsuper); + + errout10: /* unwind lbmLogInit() */ + lbmLogShutdown(log); + + jfs_warn("lmLogInit: exit(%d)", rc); + return rc; +} + + +/* + * NAME: lmLogClose() + * + * FUNCTION: remove file system <ipmnt> from active list of log <iplog> + * and close it on last close. + * + * PARAMETER: sb - superblock + * + * RETURN: errors from subroutines + * + * serialization: + */ +int lmLogClose(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct jfs_log *log = sbi->log; + struct block_device *bdev; + int rc = 0; + + jfs_info("lmLogClose: log:0x%p", log); + + down(&jfs_log_sem); + LOG_LOCK(log); + list_del(&sbi->log_list); + LOG_UNLOCK(log); + sbi->log = NULL; + + /* + * We need to make sure all of the "written" metapages + * actually make it to disk + */ + sync_blockdev(sb->s_bdev); + + if (test_bit(log_INLINELOG, &log->flag)) { + /* + * in-line log in host file system + */ + rc = lmLogShutdown(log); + kfree(log); + goto out; + } + + if (!log->no_integrity) + lmLogFileSystem(log, sbi, 0); + + if (!list_empty(&log->sb_list)) + goto out; + + /* + * TODO: ensure that the dummy_log is in a state to allow + * lbmLogShutdown to deallocate all the buffers and call + * kfree against dummy_log. For now, leave dummy_log & its + * buffers in memory, and resuse if another no-integrity mount + * is requested. + */ + if (log->no_integrity) + goto out; + + /* + * external log as separate logical volume + */ + list_del(&log->journal_list); + bdev = log->bdev; + rc = lmLogShutdown(log); + + bd_release(bdev); + blkdev_put(bdev); + + kfree(log); + + out: + up(&jfs_log_sem); + jfs_info("lmLogClose: exit(%d)", rc); + return rc; +} + + +/* + * NAME: jfs_flush_journal() + * + * FUNCTION: initiate write of any outstanding transactions to the journal + * and optionally wait until they are all written to disk + * + * wait == 0 flush until latest txn is committed, don't wait + * wait == 1 flush until latest txn is committed, wait + * wait > 1 flush until all txn's are complete, wait + */ +void jfs_flush_journal(struct jfs_log *log, int wait) +{ + int i; + struct tblock *target = NULL; + + /* jfs_write_inode may call us during read-only mount */ + if (!log) + return; + + jfs_info("jfs_flush_journal: log:0x%p wait=%d", log, wait); + + LOGGC_LOCK(log); + + if (!list_empty(&log->cqueue)) { + /* + * This ensures that we will keep writing to the journal as long + * as there are unwritten commit records + */ + target = list_entry(log->cqueue.prev, struct tblock, cqueue); + + if (test_bit(log_FLUSH, &log->flag)) { + /* + * We're already flushing. + * if flush_tblk is NULL, we are flushing everything, + * so leave it that way. Otherwise, update it to the + * latest transaction + */ + if (log->flush_tblk) + log->flush_tblk = target; + } else { + /* Only flush until latest transaction is committed */ + log->flush_tblk = target; + set_bit(log_FLUSH, &log->flag); + + /* + * Initiate I/O on outstanding transactions + */ + if (!(log->cflag & logGC_PAGEOUT)) { + log->cflag |= logGC_PAGEOUT; + lmGCwrite(log, 0); + } + } + } + if ((wait > 1) || test_bit(log_SYNCBARRIER, &log->flag)) { + /* Flush until all activity complete */ + set_bit(log_FLUSH, &log->flag); + log->flush_tblk = NULL; + } + + if (wait && target && !(target->flag & tblkGC_COMMITTED)) { + DECLARE_WAITQUEUE(__wait, current); + + add_wait_queue(&target->gcwait, &__wait); + set_current_state(TASK_UNINTERRUPTIBLE); + LOGGC_UNLOCK(log); + schedule(); + current->state = TASK_RUNNING; + LOGGC_LOCK(log); + remove_wait_queue(&target->gcwait, &__wait); + } + LOGGC_UNLOCK(log); + + if (wait < 2) + return; + + /* + * If there was recent activity, we may need to wait + * for the lazycommit thread to catch up + */ + if ((!list_empty(&log->cqueue)) || !list_empty(&log->synclist)) { + for (i = 0; i < 800; i++) { /* Too much? */ + msleep(250); + if (list_empty(&log->cqueue) && + list_empty(&log->synclist)) + break; + } + } + assert(list_empty(&log->cqueue)); + assert(list_empty(&log->synclist)); + clear_bit(log_FLUSH, &log->flag); +} + +/* + * NAME: lmLogShutdown() + * + * FUNCTION: log shutdown at last LogClose(). + * + * write log syncpt record. + * update super block to set redone flag to 0. + * + * PARAMETER: log - log inode + * + * RETURN: 0 - success + * + * serialization: single last close thread + */ +int lmLogShutdown(struct jfs_log * log) +{ + int rc; + struct lrd lrd; + int lsn; + struct logsuper *logsuper; + struct lbuf *bpsuper; + struct lbuf *bp; + struct logpage *lp; + + jfs_info("lmLogShutdown: log:0x%p", log); + + jfs_flush_journal(log, 2); + + /* + * write the last SYNCPT record with syncpoint = 0 + * (i.e., log redo up to HERE !) + */ + lrd.logtid = 0; + lrd.backchain = 0; + lrd.type = cpu_to_le16(LOG_SYNCPT); + lrd.length = 0; + lrd.log.syncpt.sync = 0; + + lsn = lmWriteRecord(log, NULL, &lrd, NULL); + bp = log->bp; + lp = (struct logpage *) bp->l_ldata; + lp->h.eor = lp->t.eor = cpu_to_le16(bp->l_eor); + lbmWrite(log, log->bp, lbmWRITE | lbmRELEASE | lbmSYNC, 0); + lbmIOWait(log->bp, lbmFREE); + + /* + * synchronous update log superblock + * mark log state as shutdown cleanly + * (i.e., Log does not need to be replayed). + */ + if ((rc = lbmRead(log, 1, &bpsuper))) + goto out; + + logsuper = (struct logsuper *) bpsuper->l_ldata; + logsuper->state = cpu_to_le32(LOGREDONE); + logsuper->end = cpu_to_le32(lsn); + lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); + rc = lbmIOWait(bpsuper, lbmFREE); + + jfs_info("lmLogShutdown: lsn:0x%x page:%d eor:%d", + lsn, log->page, log->eor); + + out: + /* + * shutdown per log i/o + */ + lbmLogShutdown(log); + + if (rc) { + jfs_warn("lmLogShutdown: exit(%d)", rc); + } + return rc; +} + + +/* + * NAME: lmLogFileSystem() + * + * FUNCTION: insert (<activate> = true)/remove (<activate> = false) + * file system into/from log active file system list. + * + * PARAMETE: log - pointer to logs inode. + * fsdev - kdev_t of filesystem. + * serial - pointer to returned log serial number + * activate - insert/remove device from active list. + * + * RETURN: 0 - success + * errors returned by vms_iowait(). + */ +static int lmLogFileSystem(struct jfs_log * log, struct jfs_sb_info *sbi, + int activate) +{ + int rc = 0; + int i; + struct logsuper *logsuper; + struct lbuf *bpsuper; + char *uuid = sbi->uuid; + + /* + * insert/remove file system device to log active file system list. + */ + if ((rc = lbmRead(log, 1, &bpsuper))) + return rc; + + logsuper = (struct logsuper *) bpsuper->l_ldata; + if (activate) { + for (i = 0; i < MAX_ACTIVE; i++) + if (!memcmp(logsuper->active[i].uuid, NULL_UUID, 16)) { + memcpy(logsuper->active[i].uuid, uuid, 16); + sbi->aggregate = i; + break; + } + if (i == MAX_ACTIVE) { + jfs_warn("Too many file systems sharing journal!"); + lbmFree(bpsuper); + return -EMFILE; /* Is there a better rc? */ + } + } else { + for (i = 0; i < MAX_ACTIVE; i++) + if (!memcmp(logsuper->active[i].uuid, uuid, 16)) { + memcpy(logsuper->active[i].uuid, NULL_UUID, 16); + break; + } + if (i == MAX_ACTIVE) { + jfs_warn("Somebody stomped on the journal!"); + lbmFree(bpsuper); + return -EIO; + } + + } + + /* + * synchronous write log superblock: + * + * write sidestream bypassing write queue: + * at file system mount, log super block is updated for + * activation of the file system before any log record + * (MOUNT record) of the file system, and at file system + * unmount, all meta data for the file system has been + * flushed before log super block is updated for deactivation + * of the file system. + */ + lbmDirectWrite(log, bpsuper, lbmWRITE | lbmRELEASE | lbmSYNC); + rc = lbmIOWait(bpsuper, lbmFREE); + + return rc; +} + +/* + * log buffer manager (lbm) + * ------------------------ + * + * special purpose buffer manager supporting log i/o requirements. + * + * per log write queue: + * log pageout occurs in serial order by fifo write queue and + * restricting to a single i/o in pregress at any one time. + * a circular singly-linked list + * (log->wrqueue points to the tail, and buffers are linked via + * bp->wrqueue field), and + * maintains log page in pageout ot waiting for pageout in serial pageout. + */ + +/* + * lbmLogInit() + * + * initialize per log I/O setup at lmLogInit() + */ +static int lbmLogInit(struct jfs_log * log) +{ /* log inode */ + int i; + struct lbuf *lbuf; + + jfs_info("lbmLogInit: log:0x%p", log); + + /* initialize current buffer cursor */ + log->bp = NULL; + + /* initialize log device write queue */ + log->wqueue = NULL; + + /* + * Each log has its own buffer pages allocated to it. These are + * not managed by the page cache. This ensures that a transaction + * writing to the log does not block trying to allocate a page from + * the page cache (for the log). This would be bad, since page + * allocation waits on the kswapd thread that may be committing inodes + * which would cause log activity. Was that clear? I'm trying to + * avoid deadlock here. + */ + init_waitqueue_head(&log->free_wait); + + log->lbuf_free = NULL; + + for (i = 0; i < LOGPAGES; i++) { + lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); + if (lbuf == 0) + goto error; + lbuf->l_ldata = (char *) get_zeroed_page(GFP_KERNEL); + if (lbuf->l_ldata == 0) { + kfree(lbuf); + goto error; + } + lbuf->l_log = log; + init_waitqueue_head(&lbuf->l_ioevent); + + lbuf->l_freelist = log->lbuf_free; + log->lbuf_free = lbuf; + } + + return (0); + + error: + lbmLogShutdown(log); + return -ENOMEM; +} + + +/* + * lbmLogShutdown() + * + * finalize per log I/O setup at lmLogShutdown() + */ +static void lbmLogShutdown(struct jfs_log * log) +{ + struct lbuf *lbuf; + + jfs_info("lbmLogShutdown: log:0x%p", log); + + lbuf = log->lbuf_free; + while (lbuf) { + struct lbuf *next = lbuf->l_freelist; + free_page((unsigned long) lbuf->l_ldata); + kfree(lbuf); + lbuf = next; + } + + log->bp = NULL; +} + + +/* + * lbmAllocate() + * + * allocate an empty log buffer + */ +static struct lbuf *lbmAllocate(struct jfs_log * log, int pn) +{ + struct lbuf *bp; + unsigned long flags; + + /* + * recycle from log buffer freelist if any + */ + LCACHE_LOCK(flags); + LCACHE_SLEEP_COND(log->free_wait, (bp = log->lbuf_free), flags); + log->lbuf_free = bp->l_freelist; + LCACHE_UNLOCK(flags); + + bp->l_flag = 0; + + bp->l_wqnext = NULL; + bp->l_freelist = NULL; + + bp->l_pn = pn; + bp->l_blkno = log->base + (pn << (L2LOGPSIZE - log->l2bsize)); + bp->l_ceor = 0; + + return bp; +} + + +/* + * lbmFree() + * + * release a log buffer to freelist + */ +static void lbmFree(struct lbuf * bp) +{ + unsigned long flags; + + LCACHE_LOCK(flags); + + lbmfree(bp); + + LCACHE_UNLOCK(flags); +} + +static void lbmfree(struct lbuf * bp) +{ + struct jfs_log *log = bp->l_log; + + assert(bp->l_wqnext == NULL); + + /* + * return the buffer to head of freelist + */ + bp->l_freelist = log->lbuf_free; + log->lbuf_free = bp; + + wake_up(&log->free_wait); + return; +} + + +/* + * NAME: lbmRedrive + * + * FUNCTION: add a log buffer to the the log redrive list + * + * PARAMETER: + * bp - log buffer + * + * NOTES: + * Takes log_redrive_lock. + */ +static inline void lbmRedrive(struct lbuf *bp) +{ + unsigned long flags; + + spin_lock_irqsave(&log_redrive_lock, flags); + bp->l_redrive_next = log_redrive_list; + log_redrive_list = bp; + spin_unlock_irqrestore(&log_redrive_lock, flags); + + wake_up(&jfs_IO_thread_wait); +} + + +/* + * lbmRead() + */ +static int lbmRead(struct jfs_log * log, int pn, struct lbuf ** bpp) +{ + struct bio *bio; + struct lbuf *bp; + + /* + * allocate a log buffer + */ + *bpp = bp = lbmAllocate(log, pn); + jfs_info("lbmRead: bp:0x%p pn:0x%x", bp, pn); + + bp->l_flag |= lbmREAD; + + bio = bio_alloc(GFP_NOFS, 1); + + bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); + bio->bi_bdev = log->bdev; + bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata); + bio->bi_io_vec[0].bv_len = LOGPSIZE; + bio->bi_io_vec[0].bv_offset = 0; + + bio->bi_vcnt = 1; + bio->bi_idx = 0; + bio->bi_size = LOGPSIZE; + + bio->bi_end_io = lbmIODone; + bio->bi_private = bp; + submit_bio(READ_SYNC, bio); + + wait_event(bp->l_ioevent, (bp->l_flag != lbmREAD)); + + return 0; +} + + +/* + * lbmWrite() + * + * buffer at head of pageout queue stays after completion of + * partial-page pageout and redriven by explicit initiation of + * pageout by caller until full-page pageout is completed and + * released. + * + * device driver i/o done redrives pageout of new buffer at + * head of pageout queue when current buffer at head of pageout + * queue is released at the completion of its full-page pageout. + * + * LOGGC_LOCK() serializes lbmWrite() by lmNextPage() and lmGroupCommit(). + * LCACHE_LOCK() serializes xflag between lbmWrite() and lbmIODone() + */ +static void lbmWrite(struct jfs_log * log, struct lbuf * bp, int flag, + int cant_block) +{ + struct lbuf *tail; + unsigned long flags; + + jfs_info("lbmWrite: bp:0x%p flag:0x%x pn:0x%x", bp, flag, bp->l_pn); + + /* map the logical block address to physical block address */ + bp->l_blkno = + log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); + + LCACHE_LOCK(flags); /* disable+lock */ + + /* + * initialize buffer for device driver + */ + bp->l_flag = flag; + + /* + * insert bp at tail of write queue associated with log + * + * (request is either for bp already/currently at head of queue + * or new bp to be inserted at tail) + */ + tail = log->wqueue; + + /* is buffer not already on write queue ? */ + if (bp->l_wqnext == NULL) { + /* insert at tail of wqueue */ + if (tail == NULL) { + log->wqueue = bp; + bp->l_wqnext = bp; + } else { + log->wqueue = bp; + bp->l_wqnext = tail->l_wqnext; + tail->l_wqnext = bp; + } + + tail = bp; + } + + /* is buffer at head of wqueue and for write ? */ + if ((bp != tail->l_wqnext) || !(flag & lbmWRITE)) { + LCACHE_UNLOCK(flags); /* unlock+enable */ + return; + } + + LCACHE_UNLOCK(flags); /* unlock+enable */ + + if (cant_block) + lbmRedrive(bp); + else if (flag & lbmSYNC) + lbmStartIO(bp); + else { + LOGGC_UNLOCK(log); + lbmStartIO(bp); + LOGGC_LOCK(log); + } +} + + +/* + * lbmDirectWrite() + * + * initiate pageout bypassing write queue for sidestream + * (e.g., log superblock) write; + */ +static void lbmDirectWrite(struct jfs_log * log, struct lbuf * bp, int flag) +{ + jfs_info("lbmDirectWrite: bp:0x%p flag:0x%x pn:0x%x", + bp, flag, bp->l_pn); + + /* + * initialize buffer for device driver + */ + bp->l_flag = flag | lbmDIRECT; + + /* map the logical block address to physical block address */ + bp->l_blkno = + log->base + (bp->l_pn << (L2LOGPSIZE - log->l2bsize)); + + /* + * initiate pageout of the page + */ + lbmStartIO(bp); +} + + +/* + * NAME: lbmStartIO() + * + * FUNCTION: Interface to DD strategy routine + * + * RETURN: none + * + * serialization: LCACHE_LOCK() is NOT held during log i/o; + */ +static void lbmStartIO(struct lbuf * bp) +{ + struct bio *bio; + struct jfs_log *log = bp->l_log; + + jfs_info("lbmStartIO\n"); + + bio = bio_alloc(GFP_NOFS, 1); + bio->bi_sector = bp->l_blkno << (log->l2bsize - 9); + bio->bi_bdev = log->bdev; + bio->bi_io_vec[0].bv_page = virt_to_page(bp->l_ldata); + bio->bi_io_vec[0].bv_len = LOGPSIZE; + bio->bi_io_vec[0].bv_offset = 0; + + bio->bi_vcnt = 1; + bio->bi_idx = 0; + bio->bi_size = LOGPSIZE; + + bio->bi_end_io = lbmIODone; + bio->bi_private = bp; + + /* check if journaling to disk has been disabled */ + if (!log->no_integrity) { + submit_bio(WRITE_SYNC, bio); + INCREMENT(lmStat.submitted); + } + else { + bio->bi_size = 0; + lbmIODone(bio, 0, 0); /* 2nd argument appears to not be used => 0 + * 3rd argument appears to not be used => 0 + */ + } +} + + +/* + * lbmIOWait() + */ +static int lbmIOWait(struct lbuf * bp, int flag) +{ + unsigned long flags; + int rc = 0; + + jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); + + LCACHE_LOCK(flags); /* disable+lock */ + + LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags); + + rc = (bp->l_flag & lbmERROR) ? -EIO : 0; + + if (flag & lbmFREE) + lbmfree(bp); + + LCACHE_UNLOCK(flags); /* unlock+enable */ + + jfs_info("lbmIOWait2: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag); + return rc; +} + +/* + * lbmIODone() + * + * executed at INTIODONE level + */ +static int lbmIODone(struct bio *bio, unsigned int bytes_done, int error) +{ + struct lbuf *bp = bio->bi_private; + struct lbuf *nextbp, *tail; + struct jfs_log *log; + unsigned long flags; + + if (bio->bi_size) + return 1; + + /* + * get back jfs buffer bound to the i/o buffer + */ + jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); + + LCACHE_LOCK(flags); /* disable+lock */ + + bp->l_flag |= lbmDONE; + + if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) { + bp->l_flag |= lbmERROR; + + jfs_err("lbmIODone: I/O error in JFS log"); + } + + bio_put(bio); + + /* + * pagein completion + */ + if (bp->l_flag & lbmREAD) { + bp->l_flag &= ~lbmREAD; + + LCACHE_UNLOCK(flags); /* unlock+enable */ + + /* wakeup I/O initiator */ + LCACHE_WAKEUP(&bp->l_ioevent); + + return 0; + } + + /* + * pageout completion + * + * the bp at the head of write queue has completed pageout. + * + * if single-commit/full-page pageout, remove the current buffer + * from head of pageout queue, and redrive pageout with + * the new buffer at head of pageout queue; + * otherwise, the partial-page pageout buffer stays at + * the head of pageout queue to be redriven for pageout + * by lmGroupCommit() until full-page pageout is completed. + */ + bp->l_flag &= ~lbmWRITE; + INCREMENT(lmStat.pagedone); + + /* update committed lsn */ + log = bp->l_log; + log->clsn = (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; + + if (bp->l_flag & lbmDIRECT) { + LCACHE_WAKEUP(&bp->l_ioevent); + LCACHE_UNLOCK(flags); + return 0; + } + + tail = log->wqueue; + + /* single element queue */ + if (bp == tail) { + /* remove head buffer of full-page pageout + * from log device write queue + */ + if (bp->l_flag & lbmRELEASE) { + log->wqueue = NULL; + bp->l_wqnext = NULL; + } + } + /* multi element queue */ + else { + /* remove head buffer of full-page pageout + * from log device write queue + */ + if (bp->l_flag & lbmRELEASE) { + nextbp = tail->l_wqnext = bp->l_wqnext; + bp->l_wqnext = NULL; + + /* + * redrive pageout of next page at head of write queue: + * redrive next page without any bound tblk + * (i.e., page w/o any COMMIT records), or + * first page of new group commit which has been + * queued after current page (subsequent pageout + * is performed synchronously, except page without + * any COMMITs) by lmGroupCommit() as indicated + * by lbmWRITE flag; + */ + if (nextbp->l_flag & lbmWRITE) { + /* + * We can't do the I/O at interrupt time. + * The jfsIO thread can do it + */ + lbmRedrive(nextbp); + } + } + } + + /* + * synchronous pageout: + * + * buffer has not necessarily been removed from write queue + * (e.g., synchronous write of partial-page with COMMIT): + * leave buffer for i/o initiator to dispose + */ + if (bp->l_flag & lbmSYNC) { + LCACHE_UNLOCK(flags); /* unlock+enable */ + + /* wakeup I/O initiator */ + LCACHE_WAKEUP(&bp->l_ioevent); + } + + /* + * Group Commit pageout: + */ + else if (bp->l_flag & lbmGC) { + LCACHE_UNLOCK(flags); + lmPostGC(bp); + } + + /* + * asynchronous pageout: + * + * buffer must have been removed from write queue: + * insert buffer at head of freelist where it can be recycled + */ + else { + assert(bp->l_flag & lbmRELEASE); + assert(bp->l_flag & lbmFREE); + lbmfree(bp); + + LCACHE_UNLOCK(flags); /* unlock+enable */ + } + + return 0; +} + +int jfsIOWait(void *arg) +{ + struct lbuf *bp; + + daemonize("jfsIO"); + + complete(&jfsIOwait); + + do { + DECLARE_WAITQUEUE(wq, current); + + spin_lock_irq(&log_redrive_lock); + while ((bp = log_redrive_list) != 0) { + log_redrive_list = bp->l_redrive_next; + bp->l_redrive_next = NULL; + spin_unlock_irq(&log_redrive_lock); + lbmStartIO(bp); + spin_lock_irq(&log_redrive_lock); + } + if (current->flags & PF_FREEZE) { + spin_unlock_irq(&log_redrive_lock); + refrigerator(PF_FREEZE); + } else { + add_wait_queue(&jfs_IO_thread_wait, &wq); + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irq(&log_redrive_lock); + schedule(); + current->state = TASK_RUNNING; + remove_wait_queue(&jfs_IO_thread_wait, &wq); + } + } while (!jfs_stop_threads); + + jfs_info("jfsIOWait being killed!"); + complete_and_exit(&jfsIOwait, 0); +} + +/* + * NAME: lmLogFormat()/jfs_logform() + * + * FUNCTION: format file system log + * + * PARAMETERS: + * log - volume log + * logAddress - start address of log space in FS block + * logSize - length of log space in FS block; + * + * RETURN: 0 - success + * -EIO - i/o error + * + * XXX: We're synchronously writing one page at a time. This needs to + * be improved by writing multiple pages at once. + */ +int lmLogFormat(struct jfs_log *log, s64 logAddress, int logSize) +{ + int rc = -EIO; + struct jfs_sb_info *sbi; + struct logsuper *logsuper; + struct logpage *lp; + int lspn; /* log sequence page number */ + struct lrd *lrd_ptr; + int npages = 0; + struct lbuf *bp; + + jfs_info("lmLogFormat: logAddress:%Ld logSize:%d", + (long long)logAddress, logSize); + + sbi = list_entry(log->sb_list.next, struct jfs_sb_info, log_list); + + /* allocate a log buffer */ + bp = lbmAllocate(log, 1); + + npages = logSize >> sbi->l2nbperpage; + + /* + * log space: + * + * page 0 - reserved; + * page 1 - log superblock; + * page 2 - log data page: A SYNC log record is written + * into this page at logform time; + * pages 3-N - log data page: set to empty log data pages; + */ + /* + * init log superblock: log page 1 + */ + logsuper = (struct logsuper *) bp->l_ldata; + + logsuper->magic = cpu_to_le32(LOGMAGIC); + logsuper->version = cpu_to_le32(LOGVERSION); + logsuper->state = cpu_to_le32(LOGREDONE); + logsuper->flag = cpu_to_le32(sbi->mntflag); /* ? */ + logsuper->size = cpu_to_le32(npages); + logsuper->bsize = cpu_to_le32(sbi->bsize); + logsuper->l2bsize = cpu_to_le32(sbi->l2bsize); + logsuper->end = cpu_to_le32(2 * LOGPSIZE + LOGPHDRSIZE + LOGRDSIZE); + + bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; + bp->l_blkno = logAddress + sbi->nbperpage; + lbmStartIO(bp); + if ((rc = lbmIOWait(bp, 0))) + goto exit; + + /* + * init pages 2 to npages-1 as log data pages: + * + * log page sequence number (lpsn) initialization: + * + * pn: 0 1 2 3 n-1 + * +-----+-----+=====+=====+===.....===+=====+ + * lspn: N-1 0 1 N-2 + * <--- N page circular file ----> + * + * the N (= npages-2) data pages of the log is maintained as + * a circular file for the log records; + * lpsn grows by 1 monotonically as each log page is written + * to the circular file of the log; + * and setLogpage() will not reset the page number even if + * the eor is equal to LOGPHDRSIZE. In order for binary search + * still work in find log end process, we have to simulate the + * log wrap situation at the log format time. + * The 1st log page written will have the highest lpsn. Then + * the succeeding log pages will have ascending order of + * the lspn starting from 0, ... (N-2) + */ + lp = (struct logpage *) bp->l_ldata; + /* + * initialize 1st log page to be written: lpsn = N - 1, + * write a SYNCPT log record is written to this page + */ + lp->h.page = lp->t.page = cpu_to_le32(npages - 3); + lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE + LOGRDSIZE); + + lrd_ptr = (struct lrd *) &lp->data; + lrd_ptr->logtid = 0; + lrd_ptr->backchain = 0; + lrd_ptr->type = cpu_to_le16(LOG_SYNCPT); + lrd_ptr->length = 0; + lrd_ptr->log.syncpt.sync = 0; + + bp->l_blkno += sbi->nbperpage; + bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; + lbmStartIO(bp); + if ((rc = lbmIOWait(bp, 0))) + goto exit; + + /* + * initialize succeeding log pages: lpsn = 0, 1, ..., (N-2) + */ + for (lspn = 0; lspn < npages - 3; lspn++) { + lp->h.page = lp->t.page = cpu_to_le32(lspn); + lp->h.eor = lp->t.eor = cpu_to_le16(LOGPHDRSIZE); + + bp->l_blkno += sbi->nbperpage; + bp->l_flag = lbmWRITE | lbmSYNC | lbmDIRECT; + lbmStartIO(bp); + if ((rc = lbmIOWait(bp, 0))) + goto exit; + } + + rc = 0; +exit: + /* + * finalize log + */ + /* release the buffer */ + lbmFree(bp); + + return rc; +} + +#ifdef CONFIG_JFS_STATISTICS +int jfs_lmstats_read(char *buffer, char **start, off_t offset, int length, + int *eof, void *data) +{ + int len = 0; + off_t begin; + + len += sprintf(buffer, + "JFS Logmgr stats\n" + "================\n" + "commits = %d\n" + "writes submitted = %d\n" + "writes completed = %d\n" + "full pages submitted = %d\n" + "partial pages submitted = %d\n", + lmStat.commit, + lmStat.submitted, + lmStat.pagedone, + lmStat.full_page, + lmStat.partial_page); + + begin = offset; + *start = buffer + begin; + len -= begin; + + if (len > length) + len = length; + else + *eof = 1; + + if (len < 0) + len = 0; + + return len; +} +#endif /* CONFIG_JFS_STATISTICS */ |
