Introduce use case section

This will now require a separate section "Use Cases". This was
originally within "Problem description", but use cases seems to be
missed when it was filled out. This will hopefully improve spec
submission.

Change-Id: I3615ca5ff5c46851e682739a8343242e2f1b0a8d

specs/juno/affinity-antiaffinity-filter.rst

@@ -48,6 +48,9 @@ this new filter can be useful.
    volumes as close to each other as possible, ideally on the same storage
    backend, for the sake of performance.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/cinder-storwize-driver-qos.rst

@@ -22,6 +22,9 @@ the amount of I/O for a specific volume. QoS has been implemented for
 some cinder storage drivers, and it is feasible for the storwize driver
 to add this feature as well.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/configurable-ssh-host-key-policy.rst

@@ -30,6 +30,8 @@ If a MITM attack were to happen, the users data could be compromised.
 In a worst case scenario, users could be tricked into attaching or even
 booting spoofed volumes containing malicious code.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/consistency-groups.rst

@@ -57,6 +57,9 @@ Assumptions:
   only rely on the storage level quiesce in phase 1 because the freeze feature
   mentioned above is not ready yet.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/datera-driver.rst

@@ -17,6 +17,9 @@ Problem description
 
 Integration for Datera storage is not available in OpenStack.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/debug-translation-removal.rst

@@ -27,6 +27,8 @@ been decided that this is not the case.  In order to bring Cinder in
 line with other OpenStack components we need to remove translation
 from debug level log messages.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/deprecate_v1_api.rst

@@ -24,6 +24,9 @@ assumed there are many clients out there still supporting v1, as well as many
 deployed clouds still using v1 that would need to make some changes to ease the
 switch.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/emc-vmax-driver-juno-update.rst

@@ -26,6 +26,9 @@ features will be added for VMAX.
 In previous release, masking view, storage group, and initiator group
 need to be created ahead of time. In Juno, this will be automated.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/emc-vnx-direct-driver-juno-update.rst

@@ -37,6 +37,8 @@ The following new functionalities will be added in this update:
 * Storage-Assisted Volume Migration
 * SP Toggle for HA
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/hyper-v-smbfs-volume-driver.rst

@@ -35,6 +35,9 @@ It will support using any type of SMB share, including:
 
     - vendor specific hardware exporting SMB shares.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/i18n-enablement.rst

@@ -31,6 +31,8 @@ API messages to also be returned in the language chosen by the user.
 This functionality is important to support the use of OpenStack by the
 international community.
 
+Use Cases
+=========
 
 Problem description
 ===================

specs/juno/limit-volume-copy-bandwidth.rst

@@ -31,6 +31,8 @@ usable. e.g. When instances directly access to the storage and doesn't go
 through I/O scheduler of cinder control node, ionice cannot control I/O
 priority and instances access may slow down.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/oracle-zfssa-cinder-driver.rst

@@ -24,6 +24,9 @@ Problem description
 Currently there is no support for ZFS Storage Appliance product line from
 Openstack Cinder.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 iSCSI driver uses REST API to communicate out of band with the storage

specs/juno/pool-aware-cinder-scheduler.rst

@@ -44,6 +44,8 @@ Therefore it is important to extend Cinder so that it is aware of storage
 pools within backend and also use them as finest granularity for resource
 placement.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/pure-iscsi-volume-driver.rst

@@ -29,6 +29,8 @@ Problem description
 Currently, the Pure Storage FlashArray cannot be used a block storage backend
 in an OpenStack environment.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/restblock-driver.rst

@@ -45,6 +45,9 @@ Also, we have plans for a few features that should come shortly:
 
  * Native snapshot management
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/smbfs-volume-driver.rst

@@ -36,6 +36,9 @@ It will support using any type of SMB share, including:
 
     - vendor specific hardware exporting SMB shares.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/support-GPFS-nas-ibmnas-driver.rst

@@ -24,6 +24,8 @@ exports provided from a gpfs server.
 * Lacking this capability will limit the end users from using remote gpfs
   NAS servers as a backend in OpenStack environment.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/support-reset-state-for-backup.rst

@@ -47,6 +47,9 @@ backup reset state API.
 2. Resetting status from creating/restoring to error
 Directly change the backup status to 'error' without restart cinder-backup.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/support-volume-backup-for-qcow2.rst

@@ -22,6 +22,9 @@ Currently, cinder-backup doesn't support qcow2 format disk because the backup
 code assumes the source volume is a raw volume. The destination (i.e. swift,
 rbd) should absolutely remain universal across all volume back-ends.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/support-volume-num-weighter.rst

@@ -42,6 +42,8 @@ for these volumes----three on volume-backend A, three on volume-backend-B. So
 that we can make full use of all volume-backends' IO capabilities to help
 improve volume-backends' IO balance and volumes' IO performance.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/juno/task-log.rst

@@ -33,6 +33,9 @@ first place).
 
 .. _engine: http://docs.openstack.org/developer/taskflow/engines.html
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/united-policy.json-in-cinder.rst

@@ -22,6 +22,9 @@ Currently, there is two policy.json files in cinder. One for cinder code,
 one for unit test code. It's not convenient for the developer and easy to
 miss one.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/vmdk-backup.rst

@@ -33,6 +33,9 @@ for the ``vmdk`` protocol and hence the attach\\detach fails for volumes
 created by the VMDK driver. This blueprint proposes adding support for
 ``backup-create``\\ ``backup-restore`` for these volumes.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/juno/volume-replication.rst

@@ -26,6 +26,9 @@ While this blueprint focuses on volume replication, a related blueprint
 focuses on consistency groups, and replication would be extended to
 support it.
 
+Use Cases
+=========
+
 Problem description
 ===================
 

specs/juno/xtremio_cinder_volume_driver.rst

@@ -55,6 +55,9 @@ The following diagram shows the command and data paths.
  +----------------+                                         +-----------------+
 
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/abc-volume-drivers.rst

@@ -25,6 +25,8 @@ the outside (manager layer) it is not visible which functionality a driver
 implements. So the only way to discover that is to try to call a function of
 a feature set and to see if it raises a ``NotImplementedError``.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/add-fibre-channel-support-to-netapp-drivers.rst

@@ -26,6 +26,9 @@ Other vendors have moved common, protocol-agnostic driver code into library
 modules and called those from the actual driver modules, which then become
 very thin indirection layers.  NetApp will take this approach as well.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/assisted_snapshot_improvements.rst

@@ -30,6 +30,8 @@ This work will also assist in supporting proper transitions between
 different phases of the snapshot create/delete process as we move
 toward a state machine in Kilo.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/backup-notification.rst

@@ -21,6 +21,9 @@ Cinder is supposed to send the notifications to ceilometer to report the
 resource usage status. This notification support has been implemented for
 the volume and the volume snapshot, but not the backup.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/chiscsi-iscsi-helper.rst

@@ -30,6 +30,9 @@ chiscsi target is not currently supported by openstack
 * Manual intervention is currently required to export volumes, as cinder does
   not understand chiscsi target implementation.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/cinder-objects.rst

@@ -31,6 +31,8 @@ There are a few problems that exists today in cinder:
 * There are multiple places where database calls are made in cinder, and this
   could result in race conditions.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/consistency-groups-kilo-update.rst

@@ -38,6 +38,9 @@ Problem description
   Cinder database.  There's a limitation to this approach, however, because
   the size of the column is fixed.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/create-states.rst

@@ -67,6 +67,9 @@ and lock acquisition techniques will likely not end in a correct solution. We
 will have to explore how to do this in a way that is *piecemeal* but also does
 not destabilize cinder more.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/database-purge.rst

@@ -28,7 +28,7 @@ for years and years. To date, there is no "mechanism" to programatically
 purge the deleted data. The archive rows feature doesn't solve this.
 
 Use Cases
-----------
+=========
 
 Operators should have the ability to purge deleted rows, possibily on a
 schedule (cronjob) or as needed (Before an upgrade, prior to maintenance)

specs/kilo/db-archiving.rst

@@ -28,6 +28,8 @@ performance and maintaining:
 
 * Storage usage utilization (low priority)
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/db-volume-filtering.rst

@@ -34,6 +34,8 @@ support additional filtering.
 The purpose of this blueprint is to make the filtering support consistent
 across these APIs.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/db2-database.rst

@@ -32,6 +32,8 @@ Problem description
   since the majority of core projects support DB2 but Cinder does not
   yet.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/driver-private-data.rst

@@ -30,6 +30,8 @@ backends have this capability.
 A use case for this is storing target CHAP secrets so iSCSI initiators can
 do CHAP authentication against targets.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/extract-brick.rst

@@ -24,6 +24,8 @@ it was meant to be a standalone library that Cinder, Nova and any other
 project in OpenStack could use.  Currently brick lives in a directory
 inside of Cinder, which means that only Cinder can use it.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/filtering-weighing-with-driver-supplied-functions.rst

@@ -39,6 +39,8 @@ actually used.  There is also a maximum volume size of 500 GB.  These details
 can be highly variable between vendors and even within different backend
 arrays from the same vendor.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/generic-volume-migration.rst

@@ -29,6 +29,9 @@ local cinder-volume instance.  This is technically not necessary for local
 volumes and also prevents drivers such as Ceph from participating in volume
 migration operations.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/get-vol-type-extra-specs.rst

@@ -25,6 +25,9 @@ values are. Having the ability to obtain the permissible volume type extra
 specs while creating or editing the extra specs will make this task easier and
 more user-friendly.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/huawei-dsware-driver.rst

@@ -25,6 +25,8 @@ Problem description
 
 Currently, user can't access Huawei Dsware by Openstack Cinder.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/huawei-sdshypervisor-driver.rst

@@ -49,6 +49,8 @@ Problem description
 
 Currently, user can't access Huawei SDShypervisor by Openstack Cinder.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/incremental-backup.rst

@@ -21,6 +21,9 @@ entire volumes during backups will be resource intensive and do not scale well
 for larger deployments. This specification discusses implementation of
 incremental backup feature in detail.
 
+Use Cases
+=========
+
 Proposed change
 ================
 Cinder backup API, by default uses Swift as its backend. When a volume is

specs/kilo/iscsi-alternative-portal.rst

@@ -23,6 +23,9 @@ attach/detach will fail even though the other portal addresses is reachable.
 To enable nova-compute to fall-back to alternative portal addresses, cinder
 should tell the alternative portal addresses to nova.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/iscsi-multipath-enhancement.rst

@@ -37,6 +37,9 @@ portal is unaccessible due to network trouble.
 that the session to the main portal can be re-established when the network
 is recovered.)
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/limit-volume-copy-bps-per-backend.rst

@@ -29,6 +29,8 @@ The current global config has some issues.
   consumed. From the viewpoint of QoS (to keep bandwidth for access from
   instances), we should limit total volume copy bandwidth per backend.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/linux-systemz.rst

@@ -39,6 +39,9 @@ respects:
 * vHBAs may be turned online, or offline. Offline vHBAs need to be
   ignored.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/multi-attach-volume.rst

@@ -28,7 +28,7 @@ that assumes the limitation of a single volume to a single instance.
   see nova/volume/cinder.py: check_attach()
 
 Use Cases
----------
+=========
 Allow users to share volumes between multiple guests using either
 read-write or read-only attachments. Clustered applications
 with two nodes where one is active and one is passive. Both

specs/kilo/nfs-backup.rst

@@ -36,6 +36,8 @@ Problem description
   by the POSIX filesystem driver (currently in review, see [3]
   and [4]).
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/nfs-snapshots.rst

@@ -24,6 +24,9 @@ driver.
 * delete snapshot
 * clone from snapshot
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/optimze-rbd-copy-volume-to-image.rst

@@ -44,6 +44,9 @@ Benefits:
 * Reduce the IO pressure on cinder-volume host when doing the
   copy_volume_to_image operation.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/over-subscription-in-thin-provisioning.rst

@@ -92,6 +92,8 @@ subscription ratio is 2.0. If no volumes have been provisioned yet,
 the apparent_available_capacity is 100 x 2.0 = 200. If 50G volumes have
 already been provisioned, the apparent_available_capacity is 200 - 50 = 150.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/private-volume-types.rst

@@ -22,6 +22,8 @@ Some volume types should only be restricted. Examples are test volume types
 where a new technology is being tried out or ultra high performance volumes
 for special needs where most users should not be able to select these volumes.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/remotefs-cfg-improvements.rst

@@ -27,6 +27,8 @@ The configuration system for NFS/GlusterFS/etc drivers:
  * is more complex than necessary
  * limits functionality such as migration
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/support-import-export-snapshots.rst

@@ -41,6 +41,9 @@ Benefits:
     By using import snapshots function to import snapshots, we could first
     delete the import snapshots, and then delete the import volumes.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/support-iscsi-driver.rst

@@ -23,6 +23,9 @@ Problem description
    This code duplication causes instability in the iSER driver code, when new
    features or changes are added to the iSCSI driver flow.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/support-modify-volume-image-metadata.rst

@@ -85,6 +85,9 @@ looking up rich information about the metadata from the definition catalog
 to display information to users and admins. This can include metadata about
 software on the volume.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/support-volume-backup-quota.rst

@@ -27,6 +27,8 @@ to take backup into account:
   of backup storage back-end, it would cause cinder-backup in the state of
   rejecting service.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/unit-test-cases-for-cinder-scripts.rst

@@ -24,6 +24,9 @@ tests for these scripts can help prevent issues similar to
 https://review.openstack.org/#/c/79791/, where a non-existent module was
 imported.  Furthermore, it increases the test coverage for each cinder script.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/valid-states-api.rst

@@ -23,6 +23,9 @@ horizon in a meaningful way by restricting the set of permissible states that
 the administrator can specify for a volume.  There is no API for this, and it
 is undesirable to hardcode this information into horizon.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/vhost-support.rst

@@ -24,6 +24,9 @@ This means the data plane does not go through emulations, which can slow down
 I/O performance. Cinder today does not provide an option for taking advantage
 of the Linux vHost driver.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/vmdk-oslo.vmware.rst

@@ -23,6 +23,9 @@ upload/download of virtual disks. The VMware drivers for nova, glance and
 ceilometer have already integrated with oslo.vmware. This spec proposes
 the integration of VMDK driver with oslo.vmware.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/volume-sorting.rst

@@ -30,6 +30,8 @@ has retrieved from the server. The items in this table need to be sorted
 by status first and by display name second. In order to retrieve data in
 this order, the APIs must accept multiple sort keys/directions.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/volume-type-description.rst

@@ -29,6 +29,8 @@ Problem description
   default volume type or None. There is no way for a user to find out
   what is the default volume type.
 
+Use Cases
+=========
 
 Proposed change
 ===============

specs/kilo/xio-iscsi-fc-volume-driver.rst

@@ -22,6 +22,9 @@ Problem description
 Currently no volume driver for X-IO ISE storage available in any release
 branch.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/kilo/xio-volume-driver-1-1.rst

@@ -34,6 +34,9 @@ The volume will be updated to align with the new type accordingly.
 Thin allocation support:
 Allow the end user to specify that the volume should be thinly allocated.
 
+Use Cases
+=========
+
 Proposed change
 ===============
 

specs/template.rst

@@ -52,14 +52,15 @@ Some notes about using this template:
 Problem description
 ===================
 
-A detailed description of the problem:
+A detailed description of the problem. What problem is this blueprint
+addressing?
 
-* For a new feature this might be use cases. Ensure you are clear about the
-  actors in each use case: End User vs Deployer
-
-* For a major reworking of something existing it would describe the
-  problems in that feature that are being addressed.
+Use Cases
+=========
 
+What use cases does this address? What impact on actors does this change have?
+Ensure you're clear about the actors in each use case: Developer, end user,
+deployer, etc.
 
 Proposed change
 ===============

tests/test_titles.py

@@ -39,11 +39,13 @@ class TestTitles(testtools.TestCase):
         return titles
 
     def _check_titles(self, spec, titles):
-        self.assertEqual(7, len(titles),
+        self.assertEqual(8, len(titles),
                          "Titles count in '%s' doesn't match expected" % spec)
         problem = 'Problem description'
         self.assertIn(problem, titles)
 
+        self.assertIn('Use Cases', titles)
+
         proposed = 'Proposed change'
         self.assertIn(proposed, titles)
         self.assertIn('Alternatives', titles[proposed])