On Tue, Dec 03, 2013 at 02:55:23PM -0600, 杨苏立 Yang Su Li wrote: > 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. Yes, I assumed that the reader has some familiarity with XFS journalling - it's documentation for XFS developers, not users... > 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? The code is your only really option. go look at fs/xfs/xfs_log_format.h where all the structures that are formatted into the log are defined, and xfs_log_recovery.c for how it is all parsed.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
