[LogFS] Only write journal if dirty
This prevents unnecessary journal writes. More importantly it prevents
an oops due to a journal write on failed mount.
diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index 94d80f7..1d081b7 100644
--- a/fs/logfs/super.c
+++ b/fs/logfs/super.c
@@ -490,7 +490,7 @@
log_super("LogFS: Start unmounting\n");
/* Alias entries slow down mount, so evict as many as possible */
sync_filesystem(sb);
- logfs_write_anchor(super->s_master_inode);
+ logfs_write_anchor(sb);
/*
* From this point on alias entries are simply dropped - and any
