XFS journal documentation?

[杨苏立 Yang Su Li]

Hi,

I am trying to understand XFS a little bit better, especially its journal
process. Unfortunately, I am having trouble find documentation in this
regard.

The general XFS documentation (
http://xfs.org/docs/xfsdocs-xml-dev/XFS_Filesystem_Structure//tmp/en-US/html/index.html)
has been quite helpful, but it doesn't describe the journal part of XFS. I
also found some kernel documentation ablout XFS's delayed logging (
https://www.kernel.org/doc/Documentation/filesystems/xfs-delayed-logging-design.txt),
which talks about the journal process a bit. But it seems to assume a lot
of prior knowledge of how the original XFS logging works to completely
understand what the author is talking about; and the term it uses (like
checkpoint) seem to have complete different meaning from, say, ext4.

So I am wondering, is there some kind of (any kind of ) documentation on
XFS journaling? Ideally it will cover the major data structure and major
code flow, but even a very high level, incomplete overview would be better
than what I have now, which is essentially nothing. And if so, where can I
find it?

Thanks a lot!

Suli

-- 
Suli Yang

Department of Physics
University of Wisconsin Madison

4257 Chamberlin Hall
Madison WI 53703
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