[Bug 1779685] [NEW] [18.04.1] Backport support for Intel VROC arrays in mdadm

[Dimitri John Ledkov 🌈]

Public bug reported:

[Impact]

 * mdadm as shipped in 18.04.0 does not support Intel VROC arrays, as to
be shipped over Bionic LTS lifecycle in multiple laptop/desktop/server
SKUs by multiple OEMs.

 * this is a request to backport mdadm master, with support of Intel
VROC arrays, and subsequent compiler fixes, and reshaping fixes, to
fully support VROC arrays (including reshaping).

[Test Cases]

 * Ensure existing Intel IMSM raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
 * Ensure existing linux raids continue to assemble, boot, shutdown cleanly, 
bootable when degraded.
   - with 0.90 metadata; 1.0 metadata; 1.1 metadata; 1.2 metadata
 * [Optional] ensure that DDF raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
 * Validate installers onto Intel IMSM raids
 * Validate installers onto Linux RAID
 * Validate bare-metal public clouds that use mdadm

[Regression Potential]

 * Worst case scenario is failing to start assembled array in rw mode,
on boot. This would result in dropping into emergency shell/mode in
either initramfs, or emergency.target requiring manual intervention by a
sysadmin to recover and start synced raid array. However, the test cases
above should cover this regression potential adequately.

 * Other changes, to resizing/reshaping may result in failure to
resize/reshape, but these are rare maintenance operations for which one
should have a backup - or able to recover from such an operation.

[Other Info]

 * xnox offline 7th July - 16th July

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: mdadm (Ubuntu Bionic)
     Importance: High
     Assignee: Dimitri John Ledkov 🌈 (xnox)
         Status: In Progress

** Affects: mdadm (Ubuntu Cosmic)
     Importance: Undecided
         Status: Fix Released

** Also affects: mdadm (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: mdadm (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: mdadm (Ubuntu Cosmic)
       Status: New => Fix Released

** Changed in: mdadm (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: mdadm (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: mdadm (Ubuntu Bionic)
    Milestone: None => ubuntu-18.04.1

** Changed in: mdadm (Ubuntu Bionic)
     Assignee: (unassigned) => Dimitri John Ledkov 🌈 (xnox)

** Description changed:

  [Impact]
  
-  * mdadm as shipped in 18.04.0 does not support Intel VROC arrays, as to
+  * mdadm as shipped in 18.04.0 does not support Intel VROC arrays, as to
  be shipped over Bionic LTS lifecycle in multiple laptop/desktop/server
  SKUs by multiple OEMs.
  
-  * this is a request to backport mdadm master, with support of Intel
+  * this is a request to backport mdadm master, with support of Intel
  VROC arrays, and subsequent compiler fixes, and reshaping fixes, to
  fully support VROC arrays (including reshaping).
  
  [Test Cases]
  
-  * Ensure existing Intel IMSM raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
-  * Ensure existing linux raids continue to assemble, boot, shutdown cleanly, 
bootable when degraded.
-    - with 0.90 metadata; 1.0 metadata; 1.1 metadata; 1.2 metadata
-  * [Optional] ensure that DDF raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
-  * Validate installers onto Intel IMSM raids
-  * Validate installers onto Linux RAID
+  * Ensure existing Intel IMSM raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
+  * Ensure existing linux raids continue to assemble, boot, shutdown cleanly, 
bootable when degraded.
+    - with 0.90 metadata; 1.0 metadata; 1.1 metadata; 1.2 metadata
+  * [Optional] ensure that DDF raids continue to assemble, boot, shutdown 
cleanly, bootable when degraded.
+  * Validate installers onto Intel IMSM raids
+  * Validate installers onto Linux RAID
+  * Validate bare-metal public clouds that use mdadm
  
+ [Regression Potential]
  
- [Regression Potential] 
- 
-  * Worst case scenario is failing to start assembled array in rw mode,
+  * Worst case scenario is failing to start assembled array in rw mode,
  on boot. This would result in dropping into emergency shell/mode in
  either initramfs, or emergency.target requiring manual intervention by a
  sysadmin to recover and start synced raid array. However, the test cases
  above should cover this regression potential adequately.
  
-  * Other changes, to resizing/reshaping may result in failure to
+  * Other changes, to resizing/reshaping may result in failure to
  resize/reshape, but these are rare maintenance operations for which one
  should have a backup - or able to recover from such an operation.
  
+ [Other Info]
  
- [Other Info]
-  
-  * xnox offline 7th July - 16th July
+  * xnox offline 7th July - 16th July

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https://bugs.launchpad.net/bugs/1779685

Title:
  [18.04.1] Backport support for Intel VROC arrays in mdadm

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