From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 22 Jun 2009 09:12:20 +0000 (+0100)
Subject: dm: introduce num_flush_requests
X-Git-Tag: v2.6.31-rc1~8^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9ab94cee313746573b2d693bc2afb807ebb0998;p=pandora-kernel.git

dm: introduce num_flush_requests

Introduce num_flush_requests for a target to set to say how many flush
instructions (empty barriers) it wants to receive.  These are sent by
__clone_and_map_empty_barrier with map_info->flush_request going from 0
to (num_flush_requests - 1).

Old targets without flush support won't receive any flush requests.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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