kib 537b66a9dd Support unmapped i/o for the md(4).
The vnode-backed md(4) has to map the unmapped bio because VOP_READ()
and VOP_WRITE() interfaces do not allow to pass unmapped requests to
the filesystem. Vnode-backed md(4) uses pbufs instead of relying on
the bio_transient_map, to avoid usual md deadlock.

Sponsored by:	The FreeBSD Foundation
Tested by:	pho, scottl
2013-03-19 15:01:50 +00:00
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