Need to fix rw lock codes

Author: meeeejin

storage/innobase/buf/buf0buf.cc

@@ -1854,15 +1854,17 @@ buf_pool_init_instance(
                 UNIV_PAGE_SIZE));
 
     /* Initialize hash structure for copy pool. */
-    srv_n_twb_hash_locks = static_cast<ulong>(
-            ut_2_power_up(srv_n_twb_hash_locks));
-
     buf_pool->twb_hash = ib_create(
             2 * buf_pool->total_entry,
             LATCH_ID_HASH_TABLE_RW_LOCK,
             srv_n_twb_hash_locks,
             MEM_HEAP_FOR_TWB_HASH);
 
+    buf_pool->twb_hash_lock = static_cast<rw_lock_t*>(
+            ut_malloc_nokey(sizeof(rw_lock_t)));
+	rw_lock_create(PFS_NOT_INSTRUMENTED, &buf_pool->twb_hash_lock,
+            SYNC_LEVEL_VARYING);
+
     /* Initialize a block and page structure. */
     buf_pool->twb_block_arr = static_cast<buf_block_t*>(
             ut_zalloc_nokey(buf_pool->total_entry * sizeof(buf_block_t)));

storage/innobase/ha/ha0ha.cc

@@ -60,7 +60,7 @@ ib_create(
 
 	ut_a(type == MEM_HEAP_FOR_BTR_SEARCH
 	     || type == MEM_HEAP_FOR_PAGE_HASH
-         /* mijin */
+        /* mijin */
 	     || type == MEM_HEAP_FOR_TWB_HASH
          /* end */);
 

storage/innobase/include/buf0buf.h

@@ -2294,7 +2294,7 @@ struct buf_pool_t{
                     /*!< the number of blocks in TWB */
     hash_table_t*   twb_hash;   /*!< hash table of twb_meta_dir_t,
                     indexed by (space_id, offset) */
-    //rw_lock_t*      twb_hash_lock;
+    rw_lock_t*      twb_hash_lock;
     buf_block_t*    twb_block_arr;  /*!< array to store pointers
                     to the buffer blocks which have been cached
                     to write_buf */