hast and zfs trim possibly causing some problems in 9.2

[Pete French]

> What do you see from:
> sysctl kstat.zfs.misc.zio_trim
>
> You should be seeing none zero unsupported and zero failed. If this is
> not the case its likely hast isnt setting bio_error to ENOTSUP.

Again, unfortunately, the systems are now running with trim diisabled
so these statsitcs have all been zeroed. I do have a test hast setup
I could re-enable this on to try lkater today or next week though.
I will try and find some time to do that and let you know what
the results are.

-pete.