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ocfs2: checkpoint appending truncate log transaction before flushing

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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 <gechangwei@live.cn>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Changwei Ge 2019-09-23 15:33:40 -07:00 committed by Linus Torvalds
parent 0a3775e4f8
commit d7283b39db
1 changed files with 15 additions and 0 deletions
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15
fs/ocfs2/alloc.c
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@ -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);