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| author | Dave Kleikamp <shaggy@austin.ibm.com> | 2006-03-08 10:59:15 -0600 |
|---|---|---|
| committer | Dave Kleikamp <shaggy@austin.ibm.com> | 2006-03-08 10:59:15 -0600 |
| commit | be0bf7da19135a7a0f8c275f20c819940be218d9 (patch) | |
| tree | c8ba72b711730ce11f52fc20cd7c0e9c4bee7bc0 /fs/jfs | |
| parent | 5b3030e39049212c975665cdb3eeabcfaf7c94ca (diff) | |
| download | linux-be0bf7da19135a7a0f8c275f20c819940be218d9.tar.gz linux-be0bf7da19135a7a0f8c275f20c819940be218d9.tar.bz2 linux-be0bf7da19135a7a0f8c275f20c819940be218d9.zip | |
JFS: Take logsync lock before testing mp->lsn
This fixes a race where lsn could be cleared before taking the lock
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Diffstat (limited to 'fs/jfs')
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 7 | ||||
| -rw-r--r-- | fs/jfs/jfs_imap.c | 6 |
2 files changed, 4 insertions, 9 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 4fb3ed184925..c161c98954e0 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -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. */ diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c index 87dd86c34c22..b62a048b6881 100644 --- a/fs/jfs/jfs_imap.c +++ b/fs/jfs/jfs_imap.c @@ -2844,11 +2844,11 @@ diUpdatePMap(struct inode *ipimap, */ lsn = tblk->lsn; log = JFS_SBI(tblk->sb)->log; + LOGSYNC_LOCK(log, flags); if (mp->lsn != 0) { /* inherit older/smaller lsn */ logdiff(difft, lsn, log); logdiff(diffp, mp->lsn, log); - LOGSYNC_LOCK(log, flags); if (difft < diffp) { mp->lsn = lsn; /* move mp after tblock in logsync list */ @@ -2860,17 +2860,15 @@ diUpdatePMap(struct inode *ipimap, logdiff(diffp, mp->clsn, log); if (difft > diffp) mp->clsn = tblk->clsn; - LOGSYNC_UNLOCK(log, flags); } else { mp->log = log; mp->lsn = lsn; /* insert mp 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_metapage(mp); return (0); } |