Comment 13 for bug 1197648

Reviewed: https://review.openstack.org/35771
Committed: http://github.com/openstack/cinder/commit/40aef764bb24330221b03bafc0e6d85fa493e383
Submitter: Jenkins
Branch: master

commit 40aef764bb24330221b03bafc0e6d85fa493e383
Author: Zhiteng Huang <email address hidden>
Date: Fri Jul 5 01:46:34 2013 -0700

    Refactor reschedule in exception handling of volume manager

    Previous exception handling has a pitfall that may potentially clear
    the sys.exc_info() (by calling SQLalchmey to update db). This patch
    refactors some part of exception handling in create_volume() to make
    sure sys.exc_info() is retrieved so that we can log and reraise it;
    also we make sure exception be reraised at the end of exception handling
    no matter the request is rescheduled or not.

    As a side effect, we fixed a bug in unittest which didn't provide
    correct argument to db API but previously this exception has been wrongly
    consumed by volume manager's exception handling (not reraise exception
    when request is rescheduled).

    fix bug: 1197648

    Change-Id: Idce5d06f8be1fb6018012503ec7f844898a21b25