nvme_fcloop: refactor host/target io job access
The split between what the host accesses on its flows vs what the target side accesses was flawed. Abort handling didn't properly clear initiator vs target structure cross-reference and locks weren't used for synchronization. Thus, there were issues of freeing structures too soon and access after free. A couple of these existed pre the IN_ISR mods, but when the target upcalls were converted to work items, thus adding delays between the 2 sides of accesses, the problems became pronounced. Resolve by: - tracking io state mainly in the tgt-side io structure. - make the tgt-side io structure released by reference not by code flow. - when changing initiator structures, use locks for synchronization - aborts are clearly tracked for which side saw the abort, and after seeing the abort, cross-references are cleared under lock. Signed-off-by: NJames Smart <james.smart@broadcom.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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