[nfs][client] - Question about handling of the NFS3_EEXIST error in SYMLINK rpc
Rick Macklem
rmacklem at uoguelph.ca
Sat Jun 20 23:22:39 UTC 2015
Alex Burlyga wrote:
> Hi,
>
> NFS client code in nfsrpc_symlink() masks server returned NFS3_EEXIST
> error
> code
> by returning 0 to the upper layers. I'm assuming this was an attempt
> to
> work around
> some server's broken replay cache out there, however, it breaks a
> more
> common
> case where server is returning EEXIST for legitimate reason and
> application
> is expecting this error code and equipped to deal with it.
>
> To fix it I see three ways of doing this:
> * Remove offending code
> * Make it optional, sysctl?
> * On NFS3_EEXIST send READLINK rpc to make sure symlink content is
> right
>
> Which of the ways will maximize the chances of getting this fix
> upstream?
>
Btw, I felt #2 above was appropriate but forgot to ask what others
thought w.r.t. this?
Thanks, rick
> One more point, old client circa FreeBSD 7.0 does not exhibit this
> problem.
>
> Alex
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