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Postpone ZVOL media/block size caching till first open.

At least on FreeBSD there are no legal way to access media or get its
size without opening device/provider first.  Postponing this caching
allows to skip several disk seeks per ZVOL/snapshot during import.

For HDD pool with 1 ZVOL in dev mode with 1000 snapshots this reduces
pool import time from 40 to 10 seconds.

Ticket:	#19463

(cherry picked from commit f780634)
(cherry picked from commit 3688764)

Merge remote-tracking branch 'origin/FIX-14337' into 9.10-STABLE

Merge remote-tracking branch 'origin/FIX-17626' into 9.10-STABLE

Reduce diff with FreeBSD.

Ticket:	#18480

(cherry picked from commit 120d2b2)

Reduce diff with FreeBSD.

Ticket:	#18480

(cherry picked from commit 120d2b2)

ixl(4): Fix potential driver interrupt setup issues and startup crash.

- Limit queue autoconfiguration to 8 queues to prevent the driver from
  requesting a large number of MSI-X vectors at boot.

- Fix potential kernel panic that occurs when the driver loads and cannot
  get all requested MSIX vectors. Instead, attach() will fail with an error.
  - Move taskqueue setup to later in attach() to prevent having to free
    taskqueues if some other error in attach() occurs.

Differential Revision:	 https://reviews.freebsd.org/D5205
MFC after:	1 month
Tested by:	jeffrey.e.pieper@intel.com
Sponsored by:	Intel Corporation

git-svn-id: svn+ssh://svn.freebsd.org/base/head@295946 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
(cherry picked from commit 37d9bcf)

Ticket: #16546
(cherry picked from commit 38f73f2)

ip_carp: redo source address for advertisments

Add a new function, carp_best_ifa(), to replace the
calls to ifaof_ifpforaddr(), when choosing a source address
for CARP advertisements.  The new function is similar but
instead of trying to match an IPv4 or IPv6 address, just
uses the "pick most-preferred ifa" (using the existing
ifa_preferred(), which already does what we want here).

Ticket: #15988
(cherry picked from commit 59c1c7c)

Merge branch 'freebsd10' into 9.10-STABLE

MFC 103 ntb(4) patches by cem@ up to r295487.

(cherry picked from commit 64cac89)

Reduce verbosity of "now sending synthesized status" message.

MFC after:	1 week

(cherry picked from commit 6cbf1d0)