MFC r231015, r231016:

MFC r231015, r231016:

r231015:

Fix the regression introduced in r226859: if the local component is
out of date BIO_READ requests got lost instead of being sent to the
remote component.

Reviewed by:	pjd

r231016:

If a local write request is from the synchronization thread, when it
is synchronizing data that is out of date on the local component, we
should not send G_GATE_CMD_DONE acknowledge to the kernel.

This fixes the issue, observed in async mode, when on synchronization
from the remote component the worker terminated with "G_GATE_CMD_DONE
failed" error.

Reported by:	Artem Kajalainen <artem kayalaynen ru>
Reviewed by:	pjd

git-svn-id: svn://svn.freebsd.org/base/stable/8@231557 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f