// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*/
|
|
/*
|
* 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.
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* 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>
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#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");
|
rc = -EINVAL;
|
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 */
|
