scatterlist handling

module/zfs/zia.c

@@ -655,13 +655,38 @@ zia_offload_abd_offset(void *provider, abd_t *abd,
 		ret = dpusm->copy.from.generic(&mv,
 		    ABD_LINEAR_BUF(abd), size);
 		ret = dpusm_to_ret(ret);
+	} else if ((abd_is_linear_page(abd) == B_TRUE) ||
+	    (abd_is_gang(abd) == B_TRUE)) {
+		ret = abd_iterate_func(abd, offset, size,
+		    zia_offload_generic_cb, &mv);
+
+		if (ret == 0) {
+			ret = ZIA_OK;
+		}
 	} else {
+#if defined(__linux__) && defined(_KERNEL)
+		if (dpusm->copy.from.scatterlist) {
+			struct abd_scatter *scatter = &ABD_SCATTER(abd);
+			mv.offset = scatter->abd_offset;
+			ret = dpusm->copy.from.scatterlist(&mv,
+			    scatter->abd_sgl, scatter->abd_nents, size);
+			ret = dpusm_to_ret(ret);
+		} else {
+			ret = abd_iterate_func(abd, offset, size,
+			    zia_offload_generic_cb, &mv);
+
+			if (ret == 0) {
+				ret = ZIA_OK;
+			}
+		}
+#else
 		ret = abd_iterate_func(abd, offset, size,
 		    zia_offload_generic_cb, &mv);
 
 		if (ret == 0) {
 			ret = ZIA_OK;
 		}
+#endif
 	}
 
 	if (ret == ZIA_OK) {
@@ -763,13 +788,38 @@ zia_onload_abd_offset(abd_t *abd, size_t offset,
 		ret = dpusm->copy.to.generic(&mv,
 		    ABD_LINEAR_BUF(abd), size);
 		ret = dpusm_to_ret(ret);
+	} else if ((abd_is_linear_page(abd) == B_TRUE) ||
+	    (abd_is_gang(abd) == B_TRUE)) {
+		ret = abd_iterate_func(abd, offset, size,
+		    zia_onload_generic_cb, &mv);
+
+		if (ret == 0) {
+			ret = ZIA_OK;
+		}
 	} else {
+#if defined(__linux__) && defined(_KERNEL)
+		if (dpusm->copy.to.scatterlist) {
+			struct abd_scatter *scatter = &ABD_SCATTER(abd);
+			mv.offset = scatter->abd_offset;
+			ret = dpusm->copy.to.scatterlist(&mv,
+			    scatter->abd_sgl, scatter->abd_nents, size);
+			ret = dpusm_to_ret(ret);
+		} else {
+			ret = abd_iterate_func(abd, offset, size,
+			    zia_onload_generic_cb, &mv);
+
+			if (ret == 0) {
+				ret = ZIA_OK;
+			}
+		}
+#else
 		ret = abd_iterate_func(abd, offset, size,
 		    zia_onload_generic_cb, &mv);
 
 		if (ret == 0) {
 			ret = ZIA_OK;
 		}
+#endif
 	}
 
 	if (keep_handle != B_TRUE) {