From: NeilBrown Date: Mon, 18 Apr 2011 08:25:42 +0000 (+1000) Subject: md: provide generic support for handling unplug callbacks. X-Git-Tag: v2.6.39-rc4~3^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97658cdd3af7d01461874c93b89afa4a2465e7c6;p=pandora-kernel.git md: provide generic support for handling unplug callbacks. When an md device adds a request to a queue, it can call mddev_check_plugged. If this succeeds then we know that the md thread will be woken up shortly, and ->plug_cnt will be non-zero until then, so some processing can be delayed. If it fails, then no unplug callback is expected and the make_request function needs to do whatever is required to make the request happen. Signed-off-by: NeilBrown --- Reading git-diff-tree failed