softdep as a mount(8) option

[Conrad Meyer]

On Sat, Oct 28, 2017 at 3:25 PM, Kirk McKusick <mckusick at mckusick.com> wrote:
> While it is safe and possible to add soft-updates (but not journalled
> soft updates) as a mount option, it means that fsck will not know that
> soft updates were in use, so it will always run in full (slow) mode at
> boot time. This is why I have not added it as an option.

Hi Kirk,

Would it be possible to add a bit, like the dirty bit, that fsck can
use to determine that the last mount of a filesystem used SU?  That
way we can retain fsck performance at the same time as enabling
mount-time choice of SU.

Best,
Conrad