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JFS: Take logsync lock before testing mp->lsn

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This fixes a race where lsn could be cleared before taking the lock

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
This commit is contained in:
Dave Kleikamp
2006-03-08 10:59:15 -06:00
parent 5b3030e390
commit be0bf7da19
2 changed files with 4 additions and 9 deletions
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7
fs/jfs/jfs_dmap.c
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@@ -532,10 +532,10 @@ dbUpdatePMap(struct inode *ipbmap,
lastlblkno = lblkno;
LOGSYNC_LOCK(log, flags);
if (mp->lsn != 0) {
/* inherit older/smaller lsn */
logdiff(diffp, mp->lsn, log);
LOGSYNC_LOCK(log, flags);
if (difft < diffp) {
mp->lsn = lsn;
@@ -548,20 +548,17 @@ dbUpdatePMap(struct inode *ipbmap,
logdiff(diffp, mp->clsn, log);
if (difft > diffp)
mp->clsn = tblk->clsn;
LOGSYNC_UNLOCK(log, flags);
} else {
mp->log = log;
mp->lsn = lsn;
/* insert bp after tblock in logsync list */
LOGSYNC_LOCK(log, flags);
log->count++;
list_add(&mp->synclist, &tblk->synclist);
mp->clsn = tblk->clsn;
LOGSYNC_UNLOCK(log, flags);
}
LOGSYNC_UNLOCK(log, flags);
}
/* write the last buffer. */