[Bug 1958433] Re: Cannot deploy Centos7 with xfs when using Focal as commissioning image

[Heitor Alves de Siqueira]

MAAS 3.0.1 has now been released, and is available as below:
- deb: ppa:maas/3.0 (3.0.1-10052-g.82c730c57-0ubuntu1~20.04.1)
- snap: 3.0/stable (3.0.1-10052-g.82c730c57)

** Changed in: maas/3.0
     Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)

** Changed in: maas/3.0
       Status: Fix Committed => Fix Released

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Title:
  Cannot deploy Centos7 with xfs when using Focal as commissioning image

Status in curtin:
  Invalid
Status in MAAS:
  Fix Released
Status in MAAS 2.8 series:
  Triaged
Status in MAAS 2.9 series:
  Fix Committed
Status in MAAS 3.0 series:
  Fix Released
Status in MAAS 3.1 series:
  Fix Released

Bug description:
  When setting Focal as commissioning image and try to deploy Centos7
  with xfs the machine keeps rebooting.

  The reboots happen because the root partition is mounted as read-only and cannot be re-mounted as rw :
  [ 1.627587] XFS (sda2): Superblock has unknown read-only compatible features (0x4) enabled.
  [ 3.115579] XFS (sda2): ro->rw transition prohibited on unknown (0x4) ro-compat filesystem

  
  If use Bionic as commissioning image Centos7+xfs is deployed without problems.

  
  The root cause of this is xfs being incompatible between older and newer versions.
  To confirm this I passed "reflink=0" to mkfs.xfs command with following hack :
  diff --git a/curtin/block/mkfs.py b/curtin/block/mkfs.py
  index ea5f09dd..abfefdb1 100644
  --- a/curtin/block/mkfs.py
  +++ b/curtin/block/mkfs.py
  @@ -84,7 +84,7 @@ family_flag_mappings = {
                "ext": ("-U", "{uuid}"),
                "reiserfs": ("--uuid", "{uuid}"),
                "swap": ("--uuid", "{uuid}"),
  -             "xfs": ("-m", "uuid={uuid}")},
  +             "xfs": ("-m", "uuid={uuid},reflink=0")},
   }
   
   release_flag_mapping_overrides = {

  
  With this hack I was able to deploy Centos7+xfs using focal as commissioning image.
  However this quick hack is only to confirm the root cause and not a good fix.
  I open this bug to investigate a more appropriate solution.

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