Re: in_compat_syscall() returns from kernel thread for X86_32.

From: Theodore Y. Ts'o
Date: Wed Oct 24 2018 - 10:33:03 EST

On Wed, Oct 24, 2018 at 09:15:34AM -0400, Theodore Y. Ts'o wrote:
> At least for ext4, the primary problem is that we want to use a 64-bit
> telldir/seekdir cookie if all 64-bits will make it to user space, and
> a 32-bit telldir cookie if only 32 bits will make it userspace. This
> impacts NFS as well because if there are people who are still using
> NFSv2, which has 32-bit directory offsets, we need to constrain the
> telldir/seekdir cookies we give to NFS to be a 32 has as opposed to a
> 64-bit hash.

Are there anyone still using NFSv2, BTW? One way of making the
problem *much* easier to sovle would be to drop NFSv2 support. :-)

- Ted