K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2013-03-19T14:53:23.872467Z
K 7
svn:log
V 356
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

END