[Bug 195061] Reproducable kernel panic on 10.1-Release when creating a zfs pool

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195061

--- Comment #6 from Steven Hartland <smh at FreeBSD.org> ---
Created attachment 149484
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149484&action=edit
Disable free on file backed vdevs

Looking at what vdev_file_io_start is doing (calling vn_rdwr) its not clear to
me why there should be any difference between in behaviour ZFS backed and UFS
backed as they would both end up doing a write, which is of course incorrect in
both cases.

The Disable free on file backed vdevs patch extends Xin's patch to ensure
ZIO_TYPE_FREE can never get through to a file backed vdev even if we're called
without checking vdev_notrim.

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