dmu_send hole patch

diff --git a/usr/src/uts/common/fs/zfs/dmu_send.c b/usr/src/uts/common/fs/zfs/dmu_send.c
index 01a4514..db60198 100644
--- a/usr/src/uts/common/fs/zfs/dmu_send.c
+++ b/usr/src/uts/common/fs/zfs/dmu_send.c
@@ -190,6 +190,15 @@ dump_free(dmu_sendarg_t *dsp, uint64_t object, uint64_t offset,
 	    (object == dsp->dsa_last_data_object &&
 	    offset > dsp->dsa_last_data_offset));

+	/*
+	 * If we are doing a non-incremental send, then there can't
+	 * be any data in the dataset we're receiving into.  Unless we're receiving
+	 * a full send as a clone, a free record would simply be a no-op.  
+	 * If we disable the tunable for this, save space by not sending it to
+	 * begin with.
+	 */
+	if (!zfs_send_set_freerecords_bit && !dsp->dsa_incremental)
+		return (0);
+
 	if (length != -1ULL && offset + length < offset)
 		length = -1ULL;

@@ -388,6 +397,10 @@ dump_freeobjects(dmu_sendarg_t *dsp, uint64_t firstobj, uint64_t numobjs)
 {
 	struct drr_freeobjects *drrfo = &(dsp->dsa_drr->drr_u.drr_freeobjects);

+	/* See comment in dump_free(). */
+	if (!zfs_send_set_freerecords_bit && !dsp->dsa_incremental)
+		return (0);
+
 	/*
 	 * If there is a pending op, but it's not PENDING_FREEOBJECTS,
 	 * push it out, since free block aggregation can only be done for