[Bug 233245] [UFS] [enhancement] Softupdates fails to track dependency between appended data and i_size

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233245

--- Comment #7 from Conrad Meyer <cem at freebsd.org> ---
(In reply to Kirk McKusick from comment #6)
Ok, I will leave it on the fs list then.

> In about 2000 I used the `special topics' lecture of my advanced code reading
> class to do a walk-through of the soft updates code. It is a 2.5 hour video of
> me going through softdep.h and ffs_softdep.c. It predates the addition of the
> journaling support, so reflects a simpler time, but is probably still useful to
> get a general understanding. I would be willing to make the video available to
> you if you want to watch it.

I think my employer has licensed some of your video series, but none
specifically annotated as around 2000.  I see a 2006 "data structures" series
where #6 covers UFS, including SU, and a 2009 "intensive code walkthrough"
series where #15 is a "special topics," including soft updates.  I don't
suppose you're referring to one of those?  If not, I would certainly appreciate
a copy of the video.

> I believe that commenting code is very important and have tried to do a good
> job of it in the soft updates code. So I strongly encourage you to work to
> improve it. Often the original author overlooks things that seem obvious to
> them but in fact are confusing to those that are not intimately familiar with
> the code.

Absolutely!

> So filling in those gaps is a valuable addition.

Ok, great.  Sounds like I have plenty of direction in how to proceed. :-)

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