[OpenAFS] Version of du that doesn't traverse AFS mount points?

[Chas Williams (CONTRACTOR)]

In message <db6e3f110808270545k5becf9a4q1b92e6a1fb12cbd@mail.gmail.com>,"Derric
k Brashear" writes:
>>> i have an interesting idea.  on linux this would be pretty easy.
>>> after generic_fill_attr() we could encode the volumeid in the i_dev
>>> field instead of the s_dev field from the superblock.  this should make
>>> this work.  i cant think of anything it would break.
>>
>> Unless I'm missing something, this breaks anything that relies on stat's
>> st_dev field to determine whether a file is in AFS or not. Filedrawers is
>> one example, and I'm sure there are others.
>
>I wanted to do something like this to make Finder happy on MacOS; The
>side effects get exciting. I might have notes somewhere. I recommend
>against it.

ok.  however, suppose you wanted to add a flag to du that says means
don't traverse mount points however, you arent interested in the pile
of afs libraries you would need to do this 'correctly'.  how about
we sneak the volume id in the st_rdev field?  this would make it
easier for someone to write the utility since they would only need
the existing to use the stat() syscall.

i dont think st_rdev has a posix defined meaning.