bcachefs-tools: O_DIRECT necessary?

[Thomas Weißschuh <thomas@xxxxxxxx>]

Hi all,

I just tried to run the unittests of bcachefs-tools and they are failing for
me.
The culprit is that mkfs.bcachefs tries to open the disk image with O_DIRECT
which is not allowed on tmpfs.

Is O_DIRECT really necessary for mkfs? It does not seem necessary for other
filesystems.

Thomas