That's really kernel wide policy and not something magic done by a
single file system.
XFS already supports an optional policy for handling metadata errors via:
/sys/fs/xfs/<disk>/error/metadata/
It would be reasonable to introduce a similar optional policy for data
errors:
/sys/fs/xfs/<disk>/error/data/
This data error policy could allow the filesystem to shut down
immediately if corrupted data is detected that might otherwise be
exposed to userspace.
While it’s unclear whether such a policy should be implemented at the
VFS level as a kernel-wide mechanism, we can certainly extend the
existing XFS error-handling framework to support it. In other words,
this would be a natural extension of current XFS functionality—not a
reinvention.
