6754498 assertion failure in dbuf_leaf_sync() - and test coverage gap in ztest

[jeff.bonw...@sun.com]

Author: Jeff Bonwick <Jeff.Bonwick at Sun.COM>
Repository: /hg/onnv/onnv-gate
Latest revision: 067dd33ef32c61ea72e00336927c331fbb341ff4
Total changesets: 1
Log message:
6754498 assertion failure in dbuf_leaf_sync() - and test coverage gap in ztest
6754502 panic in zio_vdev_io_assess() on disks that can't DKIOCFLUSHWRITECACHE

Files:
        update: usr/src/cmd/ztest/ztest.c
        update: usr/src/uts/common/fs/zfs/dbuf.c
        update: usr/src/uts/common/fs/zfs/vdev_disk.c