Messages in this thread | | | Subject | Re: [PATCH] ocfs2: call journal flush to mark journal as empty after journal recovery when mount | From | Joseph Qi <> | Date | Thu, 12 Dec 2019 13:51:45 +0800 |
| |
On 19/12/12 11:55, Changwei Ge wrote: > Hi Joseph, > > On 12/11/19 9:17 PM, Joseph Qi wrote: >> >> >> On 19/12/11 18:03, Kai Li wrote: >>> If journal is dirty when mount, it will be replayed but jbd2 sb >>> log tail cannot be updated to mark a new start because >>> journal->j_flag has already been set with JBD2_ABORT first >>> in journal_init_common. When a new transaction is committed, it >>> will be recored in block 1 first(journal->j_tail is set to 1 in >>> journal_reset). >>> >>> If emergency restart happens again before journal super block is >>> updated unfortunately, the new recorded trans will not be replayed >>> in the next mount. >>> >> I think I've finally understood the problem. But I don't think it has >> been clearly described for reviewing. I strongly suggest you describe >> the problem in the way of timeline, such as in which step, do what >> operation, and what is the status, etc. >> >> >>> This exception happens when this lun is used by only one node. If it >>> is used by multi-nodes, other node will replay its journal and its >>> journal sb block will be updated after recovery. >>> >>> To fix this problem, use jbd2_journal_flush to mark journal as empty as >>> ocfs2_replay_journal has done.> >> Sounds reasonable. But IMO, it is really a corner use scenario, using >> cluster filesystem in single node... > > True, this use case should be rare. > But considering that fixing this is not complicated and does no harm at least, I am inclining taking this in. We can only merge it to mainline rather than -stable branches. :-) > Okay, let's move it on.
Thanks, Joseph
| |