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| author | Dave Kleikamp <shaggy@austin.ibm.com> | 2006-03-14 13:44:00 -0600 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-14 14:00:48 -0800 |
| commit | a488edc914aa1d766a4e2c982b5ae03d5657ec1b (patch) | |
| tree | f31e123b8d979d5a01260cbfa12ba2052254df85 | |
| parent | 0f511ea70600efb1e06d7b55e1c51a83aff8713c (diff) | |
| download | linux-3.10-a488edc914aa1d766a4e2c982b5ae03d5657ec1b.tar.gz linux-3.10-a488edc914aa1d766a4e2c982b5ae03d5657ec1b.tar.bz2 linux-3.10-a488edc914aa1d766a4e2c982b5ae03d5657ec1b.zip | |
[PATCH] 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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -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 2967b739341..79b5404db10 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 31b4aa13dd4..4efa0d0eec3 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); } |