[Bug 2026273] Re: SRU e2fsprogs v1.47.0 for HWE reasons

[Brian Murray]

Ubuntu 23.04 (Lunar Lobster) has reached end of life, so this bug will
not be fixed for that specific release.

** Changed in: focal (Ubuntu Lunar)
       Status: New => Won't Fix

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Title:
  SRU e2fsprogs v1.47.0 for HWE reasons

Status in e2fsprogs package in Ubuntu:
  Confirmed
Status in focal package in Ubuntu:
  New
Status in e2fsprogs source package in Jammy:
  Confirmed
Status in focal source package in Jammy:
  New
Status in e2fsprogs source package in Kinetic:
  Won't Fix
Status in focal source package in Kinetic:
  New
Status in e2fsprogs source package in Lunar:
  Won't Fix
Status in focal source package in Lunar:
  Won't Fix

Bug description:
  [ Impact ]

   * orphan_file ext4 feature is available in Jammy v5.15 GA kernel
   * It is to be enabled by default in Mantic
   * fsck utility in jammy doesn't support orphan_file feature
   * as part of forwards-compatibility support it would be useful for Jammy 22.04 LTS to be able to fsck future releases (i.e. 23.10 / 24.04)
   * as part of HWE support, users may opt-in and choose to use orphan_file in Jammy today, when they do so they currently loose support to fsck a given filesystem.

  [ Test Plan ]

   * Create new ext4 filesystem with GA version of e2fsprogs and with proposed one
   * Ensure that default feature set enabled is the same (i.e. orphan_file & metadata_csum features are OFF)
   * Ensure that either fsck can fsck both filesystems
   * Use tune2fs to enable orphan_file feature
   * Ensure that new fsck can check such a filesystem, and that GA (v5.15) kernel can mount it

   * do test rebuilds of reverse-build-depends of e2fsprogs to verify to
  change of API and ABI, none should FTBFS and none should gain any new
  dependencies on the 1.47 symbols

  [ Where problems could occur ]

   * library api/abi changes:

  struct ext2_super_block size is unchanged, s_orphan_file_inum consumes
  one of the s_reserved fields.

  orphan_file related public APIs are added.

   * default features:

  Ensure that config files are unchanged, to ensure that no new features
  are enabled by default, meaning filesystems created with the upgraded
  e2fsprogs in a given Ubuntu release will keep the same feature level.

  [ Other Info ]
   
   * Anything else you think is useful to include
   * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
   * and address these questions in advance

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