How do you know when that happens?
The RPC Call send path sets up the Send SGE array. If it includes
page cache pages, it can set IB_SEND_SIGNALED.
The SGE array and the ib_cqe for the send are in the same data
structure, so the Send completion handler can find the SGE array
and figure out what needs to be unmapped.
The only problem is if a POSIX signal fires. In that case the
data structure can be released before the Send completion fires,
and we get touch-after-free in the completion handler.
I'm thinking that it just isn't going to be practical to handle
unmapping this way, and I should just revert back to using RDMA
Read instead of adding page cache pages to the Send SGE.
Or wait for the send completion before completing the I/O?
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