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thunk.h got some rudimentary environment caching, and in the
process introduced thunk_free().
Update the submodule and replace the bare free(closure) callsites
with thunk_free(closure).
This should help reduce the amount of malloc/free hammering in jio,
though there are still quite a few allocations for object payloads
in e.g. report-entry-arrays, and the object header space is allocated
as a thunk payload which doesn't get environment caching yet.
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This introduces an journal_t.idx member for "fixed" style usage
in io_uring parlance. Once all journals get opened, they're registered
in the underlying iou ring.
Subsequent operations on these files may supply these idx values
as the fd, but must also add IOSQE_FIXED_FILE to the sqe's flags.
This commit also switches the already present read operations to
use the idx/IOSQE_FIXED_FILE method.
Theoretically this should offer some efficiency gains, since the
kernel can now skip some per-operation fd handling overheads by
having them done once instead @ registration time.
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Make naming a bit more descriptive and consistent...
journals_for_each() is a simple non-IO-incurring journals
array iteration, journal_for_each() generates IO and walks
the data objects hash table... they're quite different,
and shouldn't have such similar names.
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This is a very quick and dirty experimental hack written in some
sort of bastard continuation-passing style in C w/io_uring using
journal-file introspection and manipulation duty as an excuse for
its existence.
Consider this unfinished prototype quality code.
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