Re: unionfs port/update

[Nicolas Thery <nthery@xxxxxxxxx>]

On 23 February 2010 19:04, Joe Talbott <josepht@dragonflybsd.org> wrote:
> I've been digging around a bit in the nullfs and unionfs code.  So far
[...]
> I haven't yet read the unionfs papers so the theory is still very
> generalized in my head.  Basically as I understand it all writes
> should go to an upper level vnode and reads should try the upper level
> first and fall through to the lower level if there is no upper shadow
> copy.  Removes should always operate on the upper level as well as
> creates and renames.
>
> Please let me know your thoughts and most importantly any tips and

FWIW LWN ran a serie of articles explaining various unionfs approaches:

http://lwn.net/Articles/327738/