branches/innodb+: ibuf_insert_low(): Ignore the free bits in the

insert buffer bitmap when buffering deletes or delete-marks.

TODO: ibuf_get_volume_buffered() should return only the volume of
the buffered inserts, not deletes or delete-marks.

ibuf/ibuf0ibuf.c

@@ -2999,7 +2999,6 @@ ibuf_insert_low(
 	ib_int64_t	space_versions[IBUF_MAX_N_PAGES_MERGED];
 	ulint		page_nos[IBUF_MAX_N_PAGES_MERGED];
 	ulint		n_stored;
-	ulint		bits;
 	mtr_t		mtr;
 	mtr_t		bitmap_mtr;
 
@@ -3115,8 +3114,10 @@ ibuf_insert_low(
 		goto function_exit;
 	}
 
-	bits = ibuf_bitmap_page_get_bits(bitmap_page, page_no, zip_size,
-					 IBUF_BITMAP_FREE, &bitmap_mtr);
+	if (op == IBUF_OP_INSERT) {
+		ulint	bits = ibuf_bitmap_page_get_bits(
+			bitmap_page, page_no, zip_size, IBUF_BITMAP_FREE,
+			&bitmap_mtr);
 
 		if (buffered + entry_size + page_dir_calc_reserved_space(1)
 		    > ibuf_index_page_calc_free_from_bits(zip_size, bits)) {
@@ -3129,10 +3130,12 @@ ibuf_insert_low(
 
 			ibuf_get_merge_page_nos(
 				FALSE, btr_pcur_get_rec(&pcur),
-			space_ids, space_versions, page_nos, &n_stored);
+				space_ids, space_versions,
+				page_nos, &n_stored);
 
 			goto function_exit;
 		}
+	}
 
 	/* Patch correct counter value to the entry to insert. This can
 	change the insert position, which can result in the need to abort in