tree d3f2554e5f066bc45fde92f338b46e0910675bd2
parent 9b20614988199fb03580b335a28250922e902098
author Trond Myklebust <Trond.Myklebust@netapp.com> 1363481674 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1364227450 -0400

NFSv4: Resend the READ/WRITE RPC call if a stateid change causes an error

Adds logic to ensure that if the server returns a BAD_STATEID,
or other state related error, then we check if the stateid has
already changed. If it has, then rather than start state recovery,
we should just resend the failed RPC call with the new stateid.

Allow nfs4_select_rw_stateid to notify that the stateid is unstable by
having it return -EWOULDBLOCK if an RPC is underway that might change the
stateid.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>