Merge from mysql-5.1.47-release

storage/innodb_plugin/ChangeLog

+2010-05-03	The InnoDB Team
+
+	* buf0buf.c:
+	Fix Bug#53248 compressed tables page checksum mismatch after
+	re-enabling innodb_checksums
+
 2010-04-28	The InnoDB Team
 
 	* log/log0recv.h, log/log0recv.c:

storage/innodb_plugin/btr/btr0btr.c

@@ -1999,9 +1999,13 @@ btr_page_split_and_insert(
 			split_rec = NULL;
 			goto insert_empty;
 		}
+	} else if (UNIV_UNLIKELY(insert_left)) {
+		first_rec = page_rec_get_next(page_get_infimum_rec(page));
+		move_limit = page_rec_get_next(btr_cur_get_rec(cursor));
 	} else {
 insert_empty:
 		ut_ad(!split_rec);
+		ut_ad(!insert_left);
 		buf = mem_alloc(rec_get_converted_size(cursor->index,
 						       tuple, n_ext));
 
@@ -2025,7 +2029,11 @@ btr_page_split_and_insert(
 			&& btr_page_insert_fits(cursor, split_rec,
 						offsets, tuple, n_ext, heap);
 	} else {
+		if (!insert_left) {
 			mem_free(buf);
+			buf = NULL;
+		}
+
 		insert_will_fit = !new_page_zip
 			&& btr_page_insert_fits(cursor, NULL,
 						NULL, tuple, n_ext, heap);

storage/innodb_plugin/buf/buf0buf.c

@@ -1821,13 +1821,13 @@ buf_zip_decompress(
 	ibool		check)	/*!< in: TRUE=verify the page checksum */
 {
 	const byte*	frame		= block->page.zip.data;
+	ulint		stamp_checksum	= mach_read_from_4(
+		frame + FIL_PAGE_SPACE_OR_CHKSUM);
 
 	ut_ad(buf_block_get_zip_size(block));
 	ut_a(buf_block_get_space(block) != 0);
 
-	if (UNIV_LIKELY(check)) {
-		ulint	stamp_checksum	= mach_read_from_4(
-			frame + FIL_PAGE_SPACE_OR_CHKSUM);
+	if (UNIV_LIKELY(check && stamp_checksum != BUF_NO_CHECKSUM_MAGIC)) {
 		ulint	calc_checksum	= page_zip_calc_checksum(
 			frame, page_zip_get_size(&block->page.zip));
 
@@ -2251,8 +2251,9 @@ buf_page_get_gen(
 		/* Decompress the page and apply buffered operations
 		while not holding buf_pool_mutex or block->mutex. */
 		success = buf_zip_decompress(block, srv_use_checksums);
+		ut_a(success);
 
-		if (UNIV_LIKELY(success && !recv_no_ibuf_operations)) {
+		if (UNIV_LIKELY(!recv_no_ibuf_operations)) {
 			ibuf_merge_or_delete_for_page(block, space, offset,
 						      zip_size, TRUE);
 		}
@@ -2265,13 +2266,6 @@ buf_page_get_gen(
 		mutex_exit(&block->mutex);
 		buf_pool->n_pend_unzip--;
 		rw_lock_x_unlock(&block->lock);
-
-		if (UNIV_UNLIKELY(!success)) {
-
-			buf_pool_mutex_exit();
-			return(NULL);
-		}
-
 		break;
 
 	case BUF_BLOCK_ZIP_FREE: