[Unionfs] File modification problems with unionfs and NFS

[Erez Zadok]

In message <4A7DC46B.4050709 at msgid.tls.msk.ru>, Michael Tokarev writes:
> Erez Zadok wrote:
[...]
> Aha.  So here goes  my (and not only my) "mystic" EACCESS problem which
> I reported about a year or more ago.  At that time I did some more testing
> trying to narrow it down but failed to reproduce it reliable and said some
> "more recent" kernel fixed the issue.  But it in fact did not and the prob
> happened again and again..  I just tried this patch on a "testcase" which
> caused it to happen with 100% reliability, and it does not happen any more.
> 
> Thank you very much!  Peace!

You're welcome.

> By the way, how about different versions of nfs? are them all using the same
> magic number?

Ys, AFAIK.  But nfs4 behaves differently (i.e., it handles readonly exports
correctly, as if it were a local f/s).  So the code in this patch should
only trigger on nfs2/3.

> /mjt

Erez.