[PATCH 0/3] blk-mq: rework I/O completions

[Christoph Hellwig]

This series reworks how the blk-mq core handles I/O completion.  The
prime motivation was that the current code does not work when using
a timeout handler that needs to complete requests after doing error
handling.  A fallout from fixing that by making the completions more
similar to the old request model is that we now can use the remote
IPIs for driver-internal completions as well instead of just the final
completion and thus get rid of duplicate code both in null_blk and
the pending scsi work.
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