once again problems with interrupted slots

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Hi Trond,

There is a problem with interrupted slots (yet again).

We send an operation to the server and it gets interrupted by the a signal.

We used to send a sole SEQUENCE to remove the problem of having real
operation get an out of the cache reply and failing. Now we are not
doing it again (since 3453d5708 NFSv4.1: Avoid false retries when RPC
calls are interrupted"). So the problem is

We bump the sequence on the next use of the slot, and get SEQ_MISORDERED.

We decrement the number back to the interrupted operation. This gets
us a reply out of the cache. We again fail with REMOTE EIO error.

Going back to the commit's message. I don't see the logic that the
server can't tell if this is a new call or the old one. We used to
send a lone SEQUENCE as a way to protect reuse of slot by a normal
operation. An interrupted slot couldn't have been another SEQUENCE. So
I don't see how the server can't tell a difference between SEQUENCE
and any other operations.



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