[bug #60152] XFSv5 with bigtime is not yet supported

[Geert Hendrickx]

URL:
  <https://savannah.gnu.org/bugs/?60152>

                 Summary: XFSv5 with bigtime is not yet supported
                 Project: GNU GRUB
            Submitted by: ghen
            Submitted on: Mon 01 Mar 2021 02:16:49 PM UTC
                Category: Filesystem
                Severity: Major
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: Git master
         Discussion Lock: Any
         Reproducibility: None
         Planned Release: None

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Details:

Linux kernel and mkfs.xfs version 5.10 added a new XFS feature called
`bigtime`, to overcome Y2038 timestamp limitations.  It's not yet enabled by
default, but will be in the future.

GRUB does not yet support an XFS filesystem with XFS_SB_FEAT_INCOMPAT_BIGTIME.
 Can it just be ignored/accepted like other new XFSv5 features, or does GRUB
need to get explicit support for this?


Another new incompatibility flag is XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR, to
indicate a filesystem must go through `xfs_repair` before being mounted -
mainly to accomodate filesystem upgrades (adding a new feature flag and
letting xfs_repair "fix" the feature on disk).
Here it's probably best to allow GRUB to read such a filesystem, so it can
bootstrap the OS which will deal further with the repair issue?






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