6398622 'zfs backup > file' can get 'file too large' error on 32-bit systems

[matthew.ahr...@sun.com]

Author: ahrens
Repository: /hg/onnv/onnv-gate
Revision: 7b9026518a4cff0a62228868fc908aa3e9298a49
Log message:
6398622 'zfs backup > file' can get 'file too large' error on 32-bit systems

Files:
        update: usr/src/uts/common/fs/zfs/dmu.c