MDEV-14690: Assertion `page_link == &fake_link' failed in pagecache_write_part

Fix the call to correspond protocoll of pagecache call.
Fix of misleading variables names.

mysql-test/suite/maria/maria.result

@@ -2686,3 +2686,14 @@ select count(*) from t1;
 count(*)
 13
 drop table t1;
+#
+# MDEV-14690: Assertion `page_link == &fake_link' failed in
+# pagecache_write_part
+#
+CREATE TABLE t1 (a CHAR(8), b CHAR(8), c CHAR(8) NOT NULL DEFAULT '', f FLOAT, KEY(f)) ENGINE=Aria;
+INSERT INTO t1 (a) VALUES ('foo');
+DELETE FROM t1 WHERE c < 'bar';
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 (b) VALUES ('');
+ALTER TABLE t1 ENABLE KEYS;
+DROP TABLE t1;

mysql-test/suite/maria/maria.test

@@ -1964,6 +1964,21 @@ unlock tables;
 select count(*) from t1;
 drop table t1;
 
+--echo #
+--echo # MDEV-14690: Assertion `page_link == &fake_link' failed in
+--echo # pagecache_write_part
+--echo #
+
+CREATE TABLE t1 (a CHAR(8), b CHAR(8), c CHAR(8) NOT NULL DEFAULT '', f FLOAT, KEY(f)) ENGINE=Aria;
+INSERT INTO t1 (a) VALUES ('foo');
+DELETE FROM t1 WHERE c < 'bar';
+ALTER TABLE t1 DISABLE KEYS;
+INSERT INTO t1 (b) VALUES ('');
+ALTER TABLE t1 ENABLE KEYS;
+
+# Cleanup
+DROP TABLE t1;
+
 #
 # End of test
 #

storage/maria/ma_page.c

@@ -229,17 +229,35 @@ my_bool _ma_write_keypage(MARIA_PAGE *page, enum pagecache_page_lock lock,
 #endif
 
   page_cleanup(share, page);
-  res= pagecache_write(share->pagecache,
-                       &share->kfile,
-                       (pgcache_page_no_t) (page->pos / block_size),
-                       level, buff, share->page_type,
-                       lock,
-                       lock == PAGECACHE_LOCK_LEFT_WRITELOCKED ?
-                       PAGECACHE_PIN_LEFT_PINNED :
-                       (lock == PAGECACHE_LOCK_WRITE_UNLOCK ?
-                        PAGECACHE_UNPIN : PAGECACHE_PIN),
-                       PAGECACHE_WRITE_DELAY, &page_link.link,
-		       LSN_IMPOSSIBLE);
+  {
+    PAGECACHE_BLOCK_LINK **link;
+    enum pagecache_page_pin pin;
+    if (lock == PAGECACHE_LOCK_LEFT_WRITELOCKED)
+    {
+      pin= PAGECACHE_PIN_LEFT_PINNED;
+      link= &page_link.link;
+    }
+    else if (lock == PAGECACHE_LOCK_WRITE_UNLOCK)
+    {
+      pin= PAGECACHE_UNPIN;
+      /*
+        We  unlock this page so link should be 0 to prevent it usage
+        even accidentally
+      */
+      link= NULL;
+    }
+    else
+    {
+      pin= PAGECACHE_PIN;
+      link= &page_link.link;
+    }
+    res= pagecache_write(share->pagecache,
+                         &share->kfile,
+                         (pgcache_page_no_t) (page->pos / block_size),
+                         level, buff, share->page_type,
+                         lock, pin, PAGECACHE_WRITE_DELAY, link,
+                         LSN_IMPOSSIBLE);
+  }
 
   if (lock == PAGECACHE_LOCK_WRITE)
   {