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Date: Wed, 7 Mar 2012 21:00:30 GMT
Message-Id: <201203072100.q27L0UIu001404@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
From: Andriy Gapon <avg@FreeBSD.org>
Cc: 
Subject: Re: kern/164445: [libc] lseek(2) always returns ENXIO with
 SEEK_DATA/SEEK_HOLE on 9.0 64bit ZFS
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The following reply was made to PR kern/164445; it has been noted by GNATS.

From: Andriy Gapon <avg@FreeBSD.org>
To: bug-followup@FreeBSD.org, lge@ieee.org
Cc: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Subject: Re: kern/164445: [libc] lseek(2) always returns ENXIO with SEEK_DATA/SEEK_HOLE
 on 9.0 64bit ZFS
Date: Wed, 07 Mar 2012 22:54:48 +0200

 I think that you hit the nail on the head.
 On FreeBSD the ioctl(2) system call does copyin/copyout of the data argument and
 thus those extra copyin/copuout calls in  zfs_ioctl are harmful.
 
 -- 
 Andriy Gapon