Add ZFS support to the bsdinstall partition editor and sade.

Submitted by:	Kurt Lidl (original version)
MFC after:	6 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271539 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
We don't need an exclusive object lock on the expected execution path
through {ext2,ffs}_getpages().

Reviewed by:	kib, pfg
MFC after:	6 weeks
Sponsored by:	EMC / Isilon Storage Division


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271540 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Add the new iscsi(4) man page
Cross reference it from iscsid(8) and iscsictl(8)

Reviewed by:	trasz
Approved by:	bcr (mentor), wblock (mentor)
Sponsored by:	ScaleEngine Inc.
CR:		https://reviews.freebsd.org/D741


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271543 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f