[Bug 260453] ZFS truncated write to O_APPEND file from mmap'ed memory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260453

--- Comment #3 from Andriy Gapon <avg@FreeBSD.org> ---
Note that in the "old" FreeBSD ZFS (e.g., in stable/12) there wasn't a break
after an error from dmu_write_uio_dbuf() and there was some FreeBSD specific
code to handle / tolerate EFAULT.

In the new OpenZFS that logic is gone.
There is some Linux specific code for EFAULT, but for FreeBSD there seems to be
nothing.

FWIW, I think that tools/regression/fsx should / could have caught this kind of
an issue.

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