From d7283b39dbf3de4fe54870f07d7975effa3188da Mon Sep 17 00:00:00 2001 From: Changwei Ge Date: Mon, 23 Sep 2019 15:33:40 -0700 Subject: [PATCH] ocfs2: checkpoint appending truncate log transaction before flushing Appending truncate log(TA) and and flushing truncate log(TF) are two separated transactions. They can be both committed but not checkpointed. If crash occurs then, both transaction will be replayed with several already released to global bitmap clusters. Then truncate log will be replayed resulting in cluster double free. To reproduce this issue, just crash the host while punching hole to files. Signed-off-by: Changwei Ge Reviewed-by: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ocfs2/alloc.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index f5d2bd15e0ca..f9baefc76cf9 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -5993,6 +5993,7 @@ int __ocfs2_flush_truncate_log(struct ocfs2_super *osb) struct buffer_head *data_alloc_bh = NULL; struct ocfs2_dinode *di; struct ocfs2_truncate_log *tl; + struct ocfs2_journal *journal = osb->journal; BUG_ON(inode_trylock(tl_inode)); @@ -6013,6 +6014,20 @@ int __ocfs2_flush_truncate_log(struct ocfs2_super *osb) goto out; } + /* Appending truncate log(TA) and and flushing truncate log(TF) are + * two separated transactions. They can be both committed but not + * checkpointed. If crash occurs then, both two transaction will be + * replayed with several already released to global bitmap clusters. + * Then truncate log will be replayed resulting in cluster double free. + */ + jbd2_journal_lock_updates(journal->j_journal); + status = jbd2_journal_flush(journal->j_journal); + jbd2_journal_unlock_updates(journal->j_journal); + if (status < 0) { + mlog_errno(status); + goto out; + } + data_alloc_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT);