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[Armando Migliaccio <1304234@xxxxxxxxxxxxxxxxxx>]

** No longer affects: neutron

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https://bugs.launchpad.net/bugs/1304234

Title:
  Quotas should not be updated to a value lower than current usage

Status in Cinder:
  Fix Released

Bug description:
  Cinder/Neutron now doesn't check the existing reousrces when user
  lower the quota sets.

  It will bring some confusion to end user.

  Simple steps to test:

  Step1: Create 3 volumes successfully and the quota limit for volume is
  10(default).

  Step2: Update the quota set, lower the volume limit to 1. The update
  operation will be successfully too.

  Step3: Create one more volume and get failed since "Maximum number of
  volumes allowed (1) exceeded".

  I knew we have discussed this 'bug' and I understood guys' point about this feature.
  But undeniably, I also has received some complains from end users, they feel confusion why the existing resources more than the limits of quota but they can't create any resources any more. So,this maybe is inappropriate as 'bug fix', just want to optimize this API.

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