| commit | 97658cdd3af7d01461874c93b89afa4a2465e7c6 | [log] [tgz] |
|---|---|---|
| author | NeilBrown <neilb@suse.de> | Mon Apr 18 18:25:42 2011 +1000 |
| committer | NeilBrown <neilb@suse.de> | Mon Apr 18 18:25:42 2011 +1000 |
| tree | d4e2f930850eb3981307a3eec8c86399dcebf68a | |
| parent | 482c083492ddaa32ef5864bae3d143dc8bcdf7d1 [diff] |
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 <neilb@suse.de>