| /* |
| * 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/completion.h> |
| #include <linux/kthread.h> |
| #include <linux/buffer_head.h> /* for sync_blockdev() */ |
| #include <linux/bio.h> |
| #include <linux/freezer.h> |
| #include <linux/export.h> |
| #include <linux/delay.h> |
| #include <linux/mutex.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include "jfs_incore.h" |
| #include "jfs_filsys.h" |
| #include "jfs_metapage.h" |
| #include "jfs_superblock.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); |
| |
| |
| /* |
| * log read/write serialization (per log) |
| */ |
| #define LOG_LOCK_INIT(log) mutex_init(&(log)->loglock) |
| #define LOG_LOCK(log) mutex_lock(&((log)->loglock)) |
| #define LOG_UNLOCK(log) mutex_unlock(&((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; |
| static DEFINE_MUTEX(jfs_log_mutex); |
| |
| /* |
| * 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 hard_sync); |
| |
| |
| |
| /* |
| * 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 |
| |
| static void write_special_inodes(struct jfs_log *log, |
| int (*writer)(struct address_space *)) |
| { |
| struct jfs_sb_info *sbi; |
| |
| list_for_each_entry(sbi, &log->sb_list, log_list) { |
| writer(sbi->ipbmap->i_mapping); |
| writer(sbi->ipimap->i_mapping); |
| writer(sbi->direct_inode->i_mapping); |
| } |
| } |
| |
| /* |
| * 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; |
| unsigned long flags; |
| |
| 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, flags); |
| |
| /* |
| * 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, flags); |
| |
| /* |
| * 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). |
| * calculate new value of i_nextsync which determines when |
| * this code is called again. |
| * |
| * PARAMETERS: log - log structure |
| * hard_sync - 1 to force all metadata to be written |
| * |
| * RETURN: 0 |
| * |
| * serialization: LOG_LOCK() held on entry/exit |
| */ |
| static int lmLogSync(struct jfs_log * log, int hard_sync) |
| { |
| 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; |
| unsigned long flags; |
| |
| /* push dirty metapages out to disk */ |
| if (hard_sync) |
| write_special_inodes(log, filemap_fdatawrite); |
| else |
| write_special_inodes(log, filemap_flush); |
| |
| /* |
| * 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, flags); |
| 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, flags); |
| |
| } |
| |
| /* if sync is different from last syncpt, |
| * write a SYNCPT record with syncpt = sync. |
| * reset syncpt = sync |
| */ |
| if (log->sync != log->syncpt) { |
| 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 valid for recovery. |
| * if crashed during invalid state, log state |
| * implies invalid 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; |
| |
| /* 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 (!test_bit(log_SYNCBARRIER, &log->flag) && |
| (written > LOGSYNC_BARRIER(logsize)) && log->active) { |
| 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: jfs_syncpt |
| * |
| * FUNCTION: write log SYNCPT record for specified log |
| * |
| * PARAMETERS: log - log structure |
| * hard_sync - set to 1 to force metadata to be written |
| */ |
| void jfs_syncpt(struct jfs_log *log, int hard_sync) |
| { LOG_LOCK(log); |
| if (!test_bit(log_QUIESCE, &log->flag)) |
| lmLogSync(log, hard_sync); |
| LOG_UNLOCK(log); |
| } |
| |
| /* |
| * 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); |
| |
| mutex_lock(&jfs_log_mutex); |
| list_for_each_entry(log, &jfs_external_logs, journal_list) { |
| if (log->bdev->bd_dev == sbi->logdev) { |
| if (!uuid_equal(&log->uuid, &sbi->loguuid)) { |
| jfs_warn("wrong uuid on JFS journal"); |
| mutex_unlock(&jfs_log_mutex); |
| return -EINVAL; |
| } |
| /* |
| * add file system to log active file system list |
| */ |
| if ((rc = lmLogFileSystem(log, sbi, 1))) { |
| mutex_unlock(&jfs_log_mutex); |
| return rc; |
| } |
| goto journal_found; |
| } |
| } |
| |
| if (!(log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) { |
| mutex_unlock(&jfs_log_mutex); |
| return -ENOMEM; |
| } |
| 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 = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
| log); |
| if (IS_ERR(bdev)) { |
| rc = PTR_ERR(bdev); |
| goto free; |
| } |
| |
| log->bdev = bdev; |
| uuid_copy(&log->uuid, &sbi->loguuid); |
| |
| /* |
| * initialize log: |
| */ |
| if ((rc = lmLogInit(log))) |
| goto close; |
| |
| 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); |
| |
| mutex_unlock(&jfs_log_mutex); |
| return 0; |
| |
| /* |
| * unwind on error |
| */ |
| shutdown: /* unwind lbmLogInit() */ |
| list_del(&log->journal_list); |
| lbmLogShutdown(log); |
| |
| close: /* close external log device */ |
| blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| |
| free: /* free log descriptor */ |
| mutex_unlock(&jfs_log_mutex); |
| 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 = kzalloc(sizeof(struct jfs_log), GFP_KERNEL))) |
| return -ENOMEM; |
| 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; |
| |
| mutex_lock(&jfs_log_mutex); |
| if (!dummy_log) { |
| dummy_log = kzalloc(sizeof(struct jfs_log), GFP_KERNEL); |
| if (!dummy_log) { |
| mutex_unlock(&jfs_log_mutex); |
| return -ENOMEM; |
| } |
| 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; |
| mutex_unlock(&jfs_log_mutex); |
| 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); |
| mutex_unlock(&jfs_log_mutex); |
| |
| 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 (!uuid_equal(&logsuper->uuid, &log->uuid)) { |
| 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); |
| |
| mutex_lock(&jfs_log_mutex); |
| 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); |
| |
| blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| |
| kfree(log); |
| |
| out: |
| mutex_unlock(&jfs_log_mutex); |
| 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(); |
| LOGGC_LOCK(log); |
| remove_wait_queue(&target->gcwait, &__wait); |
| } |
| LOGGC_UNLOCK(log); |
| |
| if (wait < 2) |
| return; |
| |
| write_special_inodes(log, filemap_fdatawrite); |
| |
| /* |
| * 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 < 200; i++) { /* Too much? */ |
| msleep(250); |
| write_special_inodes(log, filemap_fdatawrite); |
| if (list_empty(&log->cqueue) && |
| list_empty(&log->synclist)) |
| break; |
| } |
| } |
| assert(list_empty(&log->cqueue)); |
| |
| #ifdef CONFIG_JFS_DEBUG |
| if (!list_empty(&log->synclist)) { |
| struct logsyncblk *lp; |
| |
| printk(KERN_ERR "jfs_flush_journal: synclist not empty\n"); |
| list_for_each_entry(lp, &log->synclist, synclist) { |
| if (lp->xflag & COMMIT_PAGE) { |
| struct metapage *mp = (struct metapage *)lp; |
| print_hex_dump(KERN_ERR, "metapage: ", |
| DUMP_PREFIX_ADDRESS, 16, 4, |
| mp, sizeof(struct metapage), 0); |
| print_hex_dump(KERN_ERR, "page: ", |
| DUMP_PREFIX_ADDRESS, 16, |
| sizeof(long), mp->page, |
| sizeof(struct page), 0); |
| } else |
| print_hex_dump(KERN_ERR, "tblock:", |
| DUMP_PREFIX_ADDRESS, 16, 4, |
| lp, sizeof(struct tblock), 0); |
| } |
| } |
| #else |
| WARN_ON(!list_empty(&log->synclist)); |
| #endif |
| 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); |
| log->bp = NULL; |
| |
| /* |
| * 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; |
| uuid_t *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 (uuid_is_null(&logsuper->active[i].uuid)) { |
| uuid_copy(&logsuper->active[i].uuid, uuid); |
| 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 (uuid_equal(&logsuper->active[i].uuid, uuid)) { |
| uuid_copy(&logsuper->active[i].uuid, |
| &uuid_null); |
| 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;) { |
| char *buffer; |
| uint offset; |
| struct page *page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
| |
| if (!page) |
| goto error; |
| buffer = page_address(page); |
| for (offset = 0; offset < PAGE_SIZE; offset += LOGPSIZE) { |
| lbuf = kmalloc(sizeof(struct lbuf), GFP_KERNEL); |
| if (lbuf == NULL) { |
| if (offset == 0) |
| __free_page(page); |
| goto error; |
| } |
| if (offset) /* we already have one reference */ |
| get_page(page); |
| lbuf->l_offset = offset; |
| lbuf->l_ldata = buffer + offset; |
| lbuf->l_page = page; |
| lbuf->l_log = log; |
| init_waitqueue_head(&lbuf->l_ioevent); |
| |
| lbuf->l_freelist = log->lbuf_free; |
| log->lbuf_free = lbuf; |
| i++; |
| } |
| } |
| |
| 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(lbuf->l_page); |
| kfree(lbuf); |
| lbuf = next; |
| } |
| } |
| |
| |
| /* |
| * 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 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_process(jfsIOthread); |
| } |
| |
| |
| /* |
| * 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_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
| bio_set_dev(bio, log->bdev); |
| |
| bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
| BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); |
| |
| bio->bi_end_io = lbmIODone; |
| bio->bi_private = bp; |
| bio->bi_opf = REQ_OP_READ; |
| /*check if journaling to disk has been disabled*/ |
| if (log->no_integrity) { |
| bio->bi_iter.bi_size = 0; |
| lbmIODone(bio); |
| } else { |
| submit_bio(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"); |
| |
| bio = bio_alloc(GFP_NOFS, 1); |
| bio->bi_iter.bi_sector = bp->l_blkno << (log->l2bsize - 9); |
| bio_set_dev(bio, log->bdev); |
| |
| bio_add_page(bio, bp->l_page, LOGPSIZE, bp->l_offset); |
| BUG_ON(bio->bi_iter.bi_size != LOGPSIZE); |
| |
| bio->bi_end_io = lbmIODone; |
| bio->bi_private = bp; |
| bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; |
| |
| /* check if journaling to disk has been disabled */ |
| if (log->no_integrity) { |
| bio->bi_iter.bi_size = 0; |
| lbmIODone(bio); |
| } else { |
| submit_bio(bio); |
| INCREMENT(lmStat.submitted); |
| } |
| } |
| |
| |
| /* |
| * 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 void lbmIODone(struct bio *bio) |
| { |
| struct lbuf *bp = bio->bi_private; |
| struct lbuf *nextbp, *tail; |
| struct jfs_log *log; |
| unsigned long flags; |
| |
| /* |
| * 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 (bio->bi_status) { |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| 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 */ |
| } |
| } |
| |
| int jfsIOWait(void *arg) |
| { |
| struct lbuf *bp; |
| |
| do { |
| spin_lock_irq(&log_redrive_lock); |
| while ((bp = log_redrive_list)) { |
| 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 (freezing(current)) { |
| spin_unlock_irq(&log_redrive_lock); |
| try_to_freeze(); |
| } else { |
| set_current_state(TASK_INTERRUPTIBLE); |
| spin_unlock_irq(&log_redrive_lock); |
| schedule(); |
| } |
| } while (!kthread_should_stop()); |
| |
| jfs_info("jfsIOWait being killed!"); |
| return 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_proc_show(struct seq_file *m, void *v) |
| { |
| seq_printf(m, |
| "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); |
| return 0; |
| } |
| #endif /* CONFIG_JFS_STATISTICS */ |