[xfs-masters] XFS logging

[Junfeng Yang <yjf@xxxxxxxxxxxx>]

Hi Guys,

I'm from the Stanford checker team and currently working on applying my
file system checking tool to XFS.  can you guys answer me a few basic
questions regarding XFS logging:

1. if a transaction's commit record is written to the on-disk log (i.e.,
the record that contains XLOG_COMMIT_TRANS is synced to the on-disk log by
xlog_sync)  but not checkpointed, can XFS guarantee the replay of this
transaction during next mount?

2. does XFS allow concurrent writes to the on-disk log?

If you guys can point me to any XFS logging documents that'll be great.

Thanks,
-Junfeng