Alan Somers 0120603891 AIO: remove the kaiocb->bio linkage
Vectored aio will require each aiocb to be associated with multiple
bios, so we can't store a link to the latter from the former.  But we
don't really need to.  aio_biowakeup already knows the bio it's using,
and the other fields can be stored within the bio and/or buf itself.

Also, remove the unused kaiocb.backend2 field.

Reviewed By:	kib
Differential Revision: https://reviews.freebsd.org/D27682
2020-12-23 16:06:15 +00:00
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