diff --git a/storage/innobase/CMakeLists.txt b/storage/innobase/CMakeLists.txt
index 6cfd3d754f6..fa45cc96687 100644
--- a/storage/innobase/CMakeLists.txt
+++ b/storage/innobase/CMakeLists.txt
@@ -13,7 +13,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
-# This is the CMakeLists for InnoDB Plugin
+# This is the CMakeLists for InnoDB
 
 INCLUDE(CheckFunctionExists)
 INCLUDE(CheckCSourceCompiles)
@@ -254,29 +254,7 @@ IF(WITH_INNODB)
   SET(WITH_INNOBASE_STORAGE_ENGINE TRUE)
 ENDIF()
 
-
-#The plugin's CMakeLists.txt still needs to work with previous versions of MySQL.
-IF(EXISTS ${SOURCE_DIR}/storage/mysql_storage_engine.cmake)
-	# Old plugin support on Windows only, 
-	# use tricks to force ha_innodb.dll name for DLL
-	INCLUDE(${SOURCE_DIR}/storage/mysql_storage_engine.cmake)
-	MYSQL_STORAGE_ENGINE(INNOBASE)
-	GET_TARGET_PROPERTY(LIB_LOCATION ha_innobase LOCATION)
-	IF(LIB_LOCATION)
-		SET_TARGET_PROPERTIES(ha_innobase PROPERTIES OUTPUT_NAME ha_innodb)
-	ENDIF()
-ELSEIF (MYSQL_VERSION_ID LESS "50137")
-	# Windows only, no plugin support
-	IF (NOT SOURCE_SUBLIBS)
-		ADD_DEFINITIONS(-DMYSQL_SERVER)
-		ADD_LIBRARY(innobase STATIC ${INNOBASE_SOURCES})
-		# Require mysqld_error.h, which is built as part of the GenError
-		ADD_DEPENDENCIES(innobase GenError)
-	ENDIF()
-ELSE()
-	# New plugin support, cross-platform ,  base name for shared module is "ha_innodb"
-	MYSQL_ADD_PLUGIN(innobase ${INNOBASE_SOURCES} STORAGE_ENGINE 
-		DEFAULT
-		MODULE_OUTPUT_NAME ha_innodb
-		LINK_LIBRARIES ${ZLIB_LIBRARY})
-ENDIF()
+MYSQL_ADD_PLUGIN(innobase ${INNOBASE_SOURCES} STORAGE_ENGINE 
+  DEFAULT
+  MODULE_OUTPUT_NAME ha_innodb
+  LINK_LIBRARIES ${ZLIB_LIBRARY})
diff --git a/storage/innobase/buf/buf0buf.c b/storage/innobase/buf/buf0buf.c
index abfde83a3bd..b79b5634957 100644
--- a/storage/innobase/buf/buf0buf.c
+++ b/storage/innobase/buf/buf0buf.c
@@ -246,8 +246,8 @@ static const int WAIT_FOR_READ	= 5000;
 /** Number of attemtps made to read in a page in the buffer pool */
 static const ulint BUF_PAGE_READ_MAX_RETRIES = 100;
 
-/** The buffer buf_pool of the database */
-UNIV_INTERN buf_pool_t*	buf_pool_ptr[MAX_BUFFER_POOLS];
+/** The buffer pools of the database */
+UNIV_INTERN buf_pool_t*	buf_pool_ptr;
 
 #if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
 static ulint	buf_dbg_counter	= 0; /*!< This is used to insert validation
@@ -858,7 +858,7 @@ buf_block_init(
 
 	block->frame = frame;
 
-	block->page.buf_pool = buf_pool;
+	block->page.buf_pool_index = buf_pool_index(buf_pool);
 	block->page.state = BUF_BLOCK_NOT_USED;
 	block->page.buf_fix_count = 0;
 	block->page.io_fix = BUF_IO_NONE;
@@ -1280,8 +1280,6 @@ buf_pool_free_instance(
 	mem_free(buf_pool->chunks);
 	hash_table_free(buf_pool->page_hash);
 	hash_table_free(buf_pool->zip_hash);
-	mem_free(buf_pool);
-	buf_pool = NULL;
 }
 
 /********************************************************************//**
@@ -1294,25 +1292,23 @@ buf_pool_init(
 	ulint	total_size,	/*!< in: size of the total pool in bytes */
 	ulint	n_instances)	/*!< in: number of instances */
 {
-	ulint	i;
+	ulint		i;
+	const ulint	size	= total_size / n_instances;
+
+	ut_ad(n_instances > 0);
+	ut_ad(n_instances <= MAX_BUFFER_POOLS);
+	ut_ad(n_instances == srv_buf_pool_instances);
 
 	/* We create an extra buffer pool instance, this instance is used
 	for flushing the flush lists, to keep track of n_flush for all
 	the buffer pools and also used as a waiting object during flushing. */
+	buf_pool_ptr = mem_zalloc(n_instances * sizeof *buf_pool_ptr);
+
 	for (i = 0; i < n_instances; i++) {
-		buf_pool_t*	ptr;
-		ulint		size;
-
-		ptr = mem_zalloc(sizeof(*ptr));
-
-		size = total_size / n_instances;
-
-		buf_pool_ptr[i] = ptr;
+		buf_pool_t*	ptr	= &buf_pool_ptr[i];
 
 		if (buf_pool_init_instance(ptr, size, i) != DB_SUCCESS) {
 
-			mem_free(buf_pool_ptr[i]);
-
 			/* Free all the instances created so far. */
 			buf_pool_free(i);
 
@@ -1341,8 +1337,10 @@ buf_pool_free(
 
 	for (i = 0; i < n_instances; i++) {
 		buf_pool_free_instance(buf_pool_from_array(i));
-		buf_pool_ptr[i] = NULL;
 	}
+
+	mem_free(buf_pool_ptr);
+	buf_pool_ptr = NULL;
 }
 
 /********************************************************************//**
@@ -3685,7 +3683,7 @@ err_exit:
 		bpage = buf_buddy_alloc(buf_pool, sizeof *bpage, &lru);
 
 		/* Initialize the buf_pool pointer. */
-		bpage->buf_pool = buf_pool;
+		bpage->buf_pool_index = buf_pool_index(buf_pool);
 
 		/* If buf_buddy_alloc() allocated storage from the LRU list,
 		it released and reacquired buf_pool->mutex.  Thus, we must
diff --git a/storage/innobase/dict/dict0load.c b/storage/innobase/dict/dict0load.c
index 74f108fcf8e..9c6fa086d58 100644
--- a/storage/innobase/dict/dict0load.c
+++ b/storage/innobase/dict/dict0load.c
@@ -1733,13 +1733,13 @@ err_exit:
 		if (err != DB_SUCCESS) {
 			dict_table_remove_from_cache(table);
 			table = NULL;
+		} else {
+			table->fk_max_recusive_level = 0;
 		}
 	} else if (!srv_force_recovery) {
 		dict_table_remove_from_cache(table);
 		table = NULL;
 	}
-
-	table->fk_max_recusive_level = 0;
 #if 0
 	if (err != DB_SUCCESS && table != NULL) {
 
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index a780ae67360..c955f807a63 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -95,10 +95,6 @@ extern "C" {
 #  define MYSQL_PLUGIN_IMPORT /* nothing */
 # endif /* MYSQL_PLUGIN_IMPORT */
 
-#if MYSQL_VERSION_ID < 50124
-bool check_global_access(THD *thd, ulong want_access);
-#endif /* MYSQL_VERSION_ID < 50124 */
-
 /** to protect innobase_open_files */
 static mysql_mutex_t innobase_share_mutex;
 /** to force correct commit order in binlog */
@@ -240,7 +236,6 @@ static PSI_mutex_info all_innodb_mutexes[] = {
 	{&ibuf_mutex_key, "ibuf_mutex", 0},
 	{&ibuf_pessimistic_insert_mutex_key,
 		 "ibuf_pessimistic_insert_mutex", 0},
-	{&ios_mutex_key, "ios_mutex", 0},
 	{&kernel_mutex_key, "kernel_mutex", 0},
 	{&log_sys_mutex_key, "log_sys_mutex", 0},
 #  ifdef UNIV_MEM_DEBUG
@@ -1899,11 +1894,7 @@ innobase_convert_identifier(
 				FALSE=id is an UTF-8 string */
 {
 	char nz[NAME_LEN + 1];
-#if MYSQL_VERSION_ID >= 50141
 	char nz2[NAME_LEN + 1 + EXPLAIN_FILENAME_MAX_EXTRA_LENGTH];
-#else /* MYSQL_VERSION_ID >= 50141 */
-	char nz2[NAME_LEN + 1 + sizeof srv_mysql50_table_name_prefix];
-#endif /* MYSQL_VERSION_ID >= 50141 */
 
 	const char*	s	= id;
 	int		q;
@@ -1921,13 +1912,9 @@ innobase_convert_identifier(
 		nz[idlen] = 0;
 
 		s = nz2;
-#if MYSQL_VERSION_ID >= 50141
 		idlen = explain_filename((THD*) thd, nz, nz2, sizeof nz2,
 					 EXPLAIN_PARTITIONS_AS_COMMENT);
 		goto no_quote;
-#else /* MYSQL_VERSION_ID >= 50141 */
-		idlen = filename_to_tablename(nz, nz2, sizeof nz2);
-#endif /* MYSQL_VERSION_ID >= 50141 */
 	}
 
 	/* See if the identifier needs to be quoted. */
@@ -1938,9 +1925,7 @@ innobase_convert_identifier(
 	}
 
 	if (q == EOF) {
-#if MYSQL_VERSION_ID >= 50141
 no_quote:
-#endif /* MYSQL_VERSION_ID >= 50141 */
 		if (UNIV_UNLIKELY(idlen > buflen)) {
 			idlen = buflen;
 		}
diff --git a/storage/innobase/handler/ha_innodb.h b/storage/innobase/handler/ha_innodb.h
index 9c78c60d71e..f05ea8801f0 100644
--- a/storage/innobase/handler/ha_innodb.h
+++ b/storage/innobase/handler/ha_innodb.h
@@ -276,14 +276,13 @@ int thd_binlog_format(const MYSQL_THD thd);
 */
 void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all);
 
-#if MYSQL_VERSION_ID > 50140
 /**
   Check if binary logging is filtered for thread's current db.
   @param  thd   Thread handle
   @retval 1 the query is not filtered, 0 otherwise.
 */
 bool thd_binlog_filter_ok(const MYSQL_THD thd);
-#endif /* MYSQL_VERSION_ID > 50140 */
+
 /**
   Check if the query may generate row changes which
   may end up in the binary.
diff --git a/storage/innobase/ibuf/ibuf0ibuf.c b/storage/innobase/ibuf/ibuf0ibuf.c
index 7ef577e5178..ab42f1ad4f3 100644
--- a/storage/innobase/ibuf/ibuf0ibuf.c
+++ b/storage/innobase/ibuf/ibuf0ibuf.c
@@ -1363,12 +1363,12 @@ ibuf_add_ops(
 	const ulint*	ops)	/*!< in: operation counts */
 
 {
+	ulint	i;
+
 #ifndef HAVE_ATOMIC_BUILTINS
 	ut_ad(mutex_own(&ibuf_mutex));
 #endif /* !HAVE_ATOMIC_BUILTINS */
 
-	ulint	i;
-
 	for (i = 0; i < IBUF_OP_COUNT; i++) {
 #ifdef HAVE_ATOMIC_BUILTINS
 		os_atomic_increment_ulint(&arr[i], ops[i]);
diff --git a/storage/innobase/include/buf0buf.h b/storage/innobase/include/buf0buf.h
index b0fff919918..a42eba57fd2 100644
--- a/storage/innobase/include/buf0buf.h
+++ b/storage/innobase/include/buf0buf.h
@@ -69,7 +69,7 @@ Created 11/5/1995 Heikki Tuuri
 #define BUF_POOL_WATCH_SIZE 1		/*!< Maximum number of concurrent
 					buffer pool watches */
 
-extern	buf_pool_t*	buf_pool_ptr[MAX_BUFFER_POOLS]; /*!< The buffer pools
+extern	buf_pool_t*	buf_pool_ptr;	/*!< The buffer pools
 					of the database */
 #ifdef UNIV_DEBUG
 extern ibool		buf_debug_prints;/*!< If this is set TRUE, the program
@@ -1034,6 +1034,15 @@ buf_page_address_fold(
 	ulint	space,	/*!< in: space id */
 	ulint	offset)	/*!< in: offset of the page within space */
 	__attribute__((const));
+/********************************************************************//**
+Calculates the index of a buffer pool to the buf_pool[] array.
+@return	the position of the buffer pool in buf_pool[] */
+UNIV_INLINE
+ulint
+buf_pool_index(
+/*===========*/
+	const buf_pool_t*	buf_pool)	/*!< in: buffer pool */
+	__attribute__((nonnull, const));
 /******************************************************************//**
 Returns the buffer pool instance given a page instance
 @return buf_pool */
@@ -1065,8 +1074,9 @@ Returns the buffer pool instance given its array index
 UNIV_INLINE
 buf_pool_t*
 buf_pool_from_array(
-/*====================*/
-	ulint	index);	/*!< in: array index to get buffer pool instance from */
+/*================*/
+	ulint	index);		/*!< in: array index to get
+				buffer pool instance from */
 /******************************************************************//**
 Returns the control block of a file page, NULL if not found.
 @return	block, NULL if not found */
@@ -1204,8 +1214,13 @@ struct buf_page_struct{
 	unsigned	io_fix:2;	/*!< type of pending I/O operation;
 					also protected by buf_pool->mutex
 					@see enum buf_io_fix */
-	unsigned	buf_fix_count:25;/*!< count of how manyfold this block
+	unsigned	buf_fix_count:19;/*!< count of how manyfold this block
 					is currently bufferfixed */
+	unsigned	buf_pool_index:6;/*!< index number of the buffer pool
+					that this block belongs to */
+# if MAX_BUFFER_POOLS > 64
+#  error "MAX_BUFFER_POOLS > 64; redefine buf_pool_index:6"
+# endif
 	/* @} */
 #endif /* !UNIV_HOTBACKUP */
 	page_zip_des_t	zip;		/*!< compressed page; zip.data
@@ -1324,8 +1339,6 @@ struct buf_page_struct{
 					frees a page in buffer pool */
 # endif /* UNIV_DEBUG_FILE_ACCESSES */
 #endif /* !UNIV_HOTBACKUP */
-	buf_pool_t*	buf_pool;	/*!< buffer pool instance this
-					page belongs to */
 };
 
 /** The buffer control block structure */
diff --git a/storage/innobase/include/buf0buf.ic b/storage/innobase/include/buf0buf.ic
index 713b7cb990d..e2e83de0a78 100644
--- a/storage/innobase/include/buf0buf.ic
+++ b/storage/innobase/include/buf0buf.ic
@@ -46,6 +46,48 @@ buf_pool_get_curr_size(void)
 	return(srv_buf_pool_curr_size);
 }
 
+/********************************************************************//**
+Calculates the index of a buffer pool to the buf_pool[] array.
+@return	the position of the buffer pool in buf_pool[] */
+UNIV_INLINE
+ulint
+buf_pool_index(
+/*===========*/
+	const buf_pool_t*	buf_pool)	/*!< in: buffer pool */
+{
+	ulint	i = buf_pool - buf_pool_ptr;
+	ut_ad(i < MAX_BUFFER_POOLS);
+	ut_ad(i < srv_buf_pool_instances);
+	return(i);
+}
+
+/******************************************************************//**
+Returns the buffer pool instance given a page instance
+@return buf_pool */
+UNIV_INLINE
+buf_pool_t*
+buf_pool_from_bpage(
+/*================*/
+	const buf_page_t*	bpage) /*!< in: buffer pool page */
+{
+	ulint	i;
+	i = bpage->buf_pool_index;
+	ut_ad(i < srv_buf_pool_instances);
+	return(&buf_pool_ptr[i]);
+}
+
+/******************************************************************//**
+Returns the buffer pool instance given a block instance
+@return buf_pool */
+UNIV_INLINE
+buf_pool_t*
+buf_pool_from_block(
+/*================*/
+	const buf_block_t*	block) /*!< in: block */
+{
+	return(buf_pool_from_bpage(&block->page));
+}
+
 /*********************************************************************//**
 Gets the current size of buffer buf_pool in pages.
 @return size in pages*/
@@ -885,33 +927,6 @@ buf_block_buf_fix_dec(
 #endif
 }
 
-/******************************************************************//**
-Returns the buffer pool instance given a page instance
-@return buf_pool */
-UNIV_INLINE
-buf_pool_t*
-buf_pool_from_bpage(
-/*================*/
-	const buf_page_t*	bpage) /*!< in: buffer pool page */
-{
-	/* Every page must be in some buffer pool. */
-	ut_ad(bpage->buf_pool != NULL);
-
-	return(bpage->buf_pool);
-}
-
-/******************************************************************//**
-Returns the buffer pool instance given a block instance
-@return buf_pool */
-UNIV_INLINE
-buf_pool_t*
-buf_pool_from_block(
-/*================*/
-	const buf_block_t*	block) /*!< in: block */
-{
-	return(buf_pool_from_bpage(&block->page));
-}
-
 /******************************************************************//**
 Returns the buffer pool instance given space and offset of page
 @return buffer pool */
@@ -929,7 +944,7 @@ buf_pool_get(
 	ignored_offset = offset >> 6; /* 2log of BUF_READ_AHEAD_AREA (64)*/
 	fold = buf_page_address_fold(space, ignored_offset);
 	index = fold % srv_buf_pool_instances;
-	return buf_pool_ptr[index];
+	return(&buf_pool_ptr[index]);
 }
 
 /******************************************************************//**
@@ -939,10 +954,12 @@ UNIV_INLINE
 buf_pool_t*
 buf_pool_from_array(
 /*================*/
-	ulint	index) 		/*!< in: array index to get
+	ulint	index)		/*!< in: array index to get
 				buffer pool instance from */
 {
-	return buf_pool_ptr[index];
+	ut_ad(index < MAX_BUFFER_POOLS);
+	ut_ad(index < srv_buf_pool_instances);
+	return(&buf_pool_ptr[index]);
 }
 
 /******************************************************************//**
diff --git a/storage/innobase/include/sync0sync.h b/storage/innobase/include/sync0sync.h
index 940e583350a..fb3a24c5ee5 100644
--- a/storage/innobase/include/sync0sync.h
+++ b/storage/innobase/include/sync0sync.h
@@ -85,7 +85,6 @@ extern mysql_pfs_key_t	hash_table_mutex_key;
 extern mysql_pfs_key_t	ibuf_bitmap_mutex_key;
 extern mysql_pfs_key_t	ibuf_mutex_key;
 extern mysql_pfs_key_t	ibuf_pessimistic_insert_mutex_key;
-extern mysql_pfs_key_t	ios_mutex_key;
 extern mysql_pfs_key_t	log_sys_mutex_key;
 extern mysql_pfs_key_t	log_flush_order_mutex_key;
 extern mysql_pfs_key_t	kernel_mutex_key;
diff --git a/storage/innobase/include/trx0undo.h b/storage/innobase/include/trx0undo.h
index 54809f9c2d5..937e9d7ef79 100644
--- a/storage/innobase/include/trx0undo.h
+++ b/storage/innobase/include/trx0undo.h
@@ -262,8 +262,6 @@ UNIV_INTERN
 page_t*
 trx_undo_set_state_at_finish(
 /*=========================*/
-	trx_rseg_t*	rseg,	/*!< in: rollback segment memory object */
-	trx_t*		trx,	/*!< in: transaction */
 	trx_undo_t*	undo,	/*!< in: undo log memory copy */
 	mtr_t*		mtr);	/*!< in: mtr */
 /******************************************************************//**
diff --git a/storage/innobase/os/os0file.c b/storage/innobase/os/os0file.c
index 3d1577fe3ca..93d2f72746d 100644
--- a/storage/innobase/os/os0file.c
+++ b/storage/innobase/os/os0file.c
@@ -2400,7 +2400,10 @@ os_file_read_func(
 	ulint		i;
 #endif /* !UNIV_HOTBACKUP */
 
+	/* On 64-bit Windows, ulint is 64 bits. But offset and n should be
+	no more than 32 bits. */
 	ut_a((offset & 0xFFFFFFFFUL) == offset);
+	ut_a((n & 0xFFFFFFFFUL) == n);
 
 	os_n_file_reads++;
 	os_bytes_read_since_printout += n;
@@ -2526,7 +2529,10 @@ os_file_read_no_error_handling_func(
 	ulint		i;
 #endif /* !UNIV_HOTBACKUP */
 
+	/* On 64-bit Windows, ulint is 64 bits. But offset and n should be
+	no more than 32 bits. */
 	ut_a((offset & 0xFFFFFFFFUL) == offset);
+	ut_a((n & 0xFFFFFFFFUL) == n);
 
 	os_n_file_reads++;
 	os_bytes_read_since_printout += n;
@@ -2658,7 +2664,10 @@ os_file_write_func(
 	ulint		i;
 #endif /* !UNIV_HOTBACKUP */
 
-	ut_a((offset & 0xFFFFFFFF) == offset);
+	/* On 64-bit Windows, ulint is 64 bits. But offset and n should be
+	no more than 32 bits. */
+	ut_a((offset & 0xFFFFFFFFUL) == offset);
+	ut_a((n & 0xFFFFFFFFUL) == n);
 
 	os_n_file_writes++;
 
@@ -3621,6 +3630,10 @@ os_aio_array_reserve_slot(
 	ulint		slots_per_seg;
 	ulint		local_seg;
 
+#ifdef WIN_ASYNC_IO
+	ut_a((len & 0xFFFFFFFFUL) == len);
+#endif
+
 	/* No need of a mutex. Only reading constant fields */
 	slots_per_seg = array->n_slots / array->n_segments;
 
@@ -3996,6 +4009,9 @@ os_aio_func(
 	ut_ad(n % OS_FILE_LOG_BLOCK_SIZE == 0);
 	ut_ad(offset % OS_FILE_LOG_BLOCK_SIZE == 0);
 	ut_ad(os_aio_validate());
+#ifdef WIN_ASYNC_IO
+	ut_ad((n & 0xFFFFFFFFUL) == n);
+#endif
 
 	wake_later = mode & OS_AIO_SIMULATED_WAKE_LATER;
 	mode = mode & (~OS_AIO_SIMULATED_WAKE_LATER);
@@ -4271,16 +4287,18 @@ os_aio_windows_handle(
 					    __FILE__, __LINE__);
 #endif
 
+		ut_a((slot->len & 0xFFFFFFFFUL) == slot->len);
+
 		switch (slot->type) {
 		case OS_FILE_WRITE:
 			ret = WriteFile(slot->file, slot->buf,
-					slot->len, &len,
+					(DWORD) slot->len, &len,
 					&(slot->control));
 
 			break;
 		case OS_FILE_READ:
 			ret = ReadFile(slot->file, slot->buf,
-				       slot->len, &len,
+				       (DWORD) slot->len, &len,
 				       &(slot->control));
 
 			break;
diff --git a/storage/innobase/os/os0sync.c b/storage/innobase/os/os0sync.c
index 5c400ae31c5..24d36acecb2 100644
--- a/storage/innobase/os/os0sync.c
+++ b/storage/innobase/os/os0sync.c
@@ -136,20 +136,30 @@ os_cond_wait_timed(
 #ifndef __WIN__
 	const struct timespec*	abstime		/*!< in: timeout */
 #else
-	ulint			time_in_ms	/*!< in: timeout in
+	DWORD			time_in_ms	/*!< in: timeout in
 						milliseconds*/
 #endif /* !__WIN__ */
 )
 {
 #ifdef __WIN__
-	BOOL			ret;
+	BOOL	ret;
+	DWORD	err;
 
 	ut_a(sleep_condition_variable != NULL);
 
 	ret = sleep_condition_variable(cond, mutex, time_in_ms);
 
-	if (!ret && GetLastError() == WAIT_TIMEOUT) {
-		return(TRUE);
+	if (!ret) {
+		err = GetLastError();
+		/* From http://msdn.microsoft.com/en-us/library/ms686301%28VS.85%29.aspx,
+		"Condition variables are subject to spurious wakeups
+		(those not associated with an explicit wake) and stolen wakeups
+		(another thread manages to run before the woken thread)."
+		Check for both types of timeouts.
+		Conditions are checked by the caller.*/
+		if ((err == WAIT_TIMEOUT) || (err == ERROR_TIMEOUT)) {
+			return(TRUE);
+		}
 	}
 
 	ut_a(ret);
@@ -163,12 +173,15 @@ os_cond_wait_timed(
 	switch (ret) {
 	case 0:
 	case ETIMEDOUT:
-	       	break;
+	/* We play it safe by checking for EINTR even though
+	according to the POSIX documentation it can't return EINTR. */
+	case EINTR:
+		break;
 
 	default:
 		fprintf(stderr, "  InnoDB: pthread_cond_timedwait() returned: "
 				"%d: abstime={%lu,%lu}\n",
-			       	ret, abstime->tv_sec, abstime->tv_nsec);
+				ret, (ulong) abstime->tv_sec, (ulong) abstime->tv_nsec);
 		ut_error;
 	}
 
@@ -655,7 +668,7 @@ os_event_wait_time_low(
 		ut_a(event);
 
 		if (time_in_usec != OS_SYNC_INFINITE_TIME) {
-			time_in_ms = time_in_ms / 1000;
+			time_in_ms = time_in_usec / 1000;
 			err = WaitForSingleObject(event->handle, time_in_ms);
 		} else {
 			err = WaitForSingleObject(event->handle, INFINITE);
@@ -663,7 +676,7 @@ os_event_wait_time_low(
 
 		if (err == WAIT_OBJECT_0) {
 			return(0);
-		} else if (err == WAIT_TIMEOUT) {
+		} else if ((err == WAIT_TIMEOUT) || (err == ERROR_TIMEOUT)) {
 			return(OS_SYNC_TIME_EXCEEDED);
 		}
 
diff --git a/storage/innobase/row/row0mysql.c b/storage/innobase/row/row0mysql.c
index f298b3224e0..bd9143125f8 100644
--- a/storage/innobase/row/row0mysql.c
+++ b/storage/innobase/row/row0mysql.c
@@ -2839,15 +2839,6 @@ row_truncate_table_for_mysql(
 
 	trx->table_id = table->id;
 
-	/* Lock all index trees for this table, as we will
-	truncate the table/index and possibly change their metadata.
-	All DML/DDL are blocked by table level lock, with
-	a few exceptions such as queries into information schema
-	about the table, MySQL could try to access index stats
-	for this kind of query, we need to use index locks to
-	sync up */
-	dict_table_x_lock_indexes(table);
-
 	if (table->space && !table->dir_path_of_temp_table) {
 		/* Discard and create the single-table tablespace. */
 		ulint	space	= table->space;
@@ -2860,6 +2851,11 @@ row_truncate_table_for_mysql(
 
 			dict_hdr_get_new_id(NULL, NULL, &space);
 
+			/* Lock all index trees for this table. We must
+			do so after dict_hdr_get_new_id() to preserve
+			the latch order */
+			dict_table_x_lock_indexes(table);
+
 			if (space == ULINT_UNDEFINED
 			    || fil_create_new_single_table_tablespace(
 				    space, table->name, FALSE, flags,
@@ -2893,6 +2889,15 @@ row_truncate_table_for_mysql(
 					FIL_IBD_FILE_INITIAL_SIZE, &mtr);
 			mtr_commit(&mtr);
 		}
+	} else {
+		/* Lock all index trees for this table, as we will
+		truncate the table/index and possibly change their metadata.
+		All DML/DDL are blocked by table level lock, with
+		a few exceptions such as queries into information schema
+		about the table, MySQL could try to access index stats
+		for this kind of query, we need to use index locks to
+		sync up */
+		dict_table_x_lock_indexes(table);
 	}
 
 	/* scan SYS_INDEXES for all indexes of the table */
diff --git a/storage/innobase/srv/srv0start.c b/storage/innobase/srv/srv0start.c
index 67586de736c..d7ea3d5d3da 100644
--- a/storage/innobase/srv/srv0start.c
+++ b/storage/innobase/srv/srv0start.c
@@ -120,11 +120,6 @@ UNIV_INTERN enum srv_shutdown_state	srv_shutdown_state = SRV_SHUTDOWN_NONE;
 /** Files comprising the system tablespace */
 static os_file_t	files[1000];
 
-/** Mutex protecting the ios count */
-static mutex_t		ios_mutex;
-/** Count of I/O operations in io_handler_thread() */
-static ulint		ios;
-
 /** io_handler_thread parameters for thread identification */
 static ulint		n[SRV_MAX_N_IO_THREADS + 6];
 /** io_handler_thread identifiers */
@@ -152,11 +147,6 @@ UNIV_INTERN mysql_pfs_key_t	srv_master_thread_key;
 UNIV_INTERN mysql_pfs_key_t	srv_purge_thread_key;
 #endif /* UNIV_PFS_THREAD */
 
-#ifdef UNIV_PFS_MUTEX
-/* Key to register ios_mutex_key with performance schema */
-UNIV_INTERN mysql_pfs_key_t	ios_mutex_key;
-#endif /* UNIV_PFS_MUTEX */
-
 /*********************************************************************//**
 Convert a numeric string that optionally ends in G or M, to a number
 containing megabytes.
@@ -491,10 +481,6 @@ io_handler_thread(
 
 	while (srv_shutdown_state != SRV_SHUTDOWN_EXIT_THREADS) {
 		fil_aio_wait(segment);
-
-		mutex_enter(&ios_mutex);
-		ios++;
-		mutex_exit(&ios_mutex);
 	}
 
 	/* We count the number of threads in os_thread_exit(). A created
@@ -998,10 +984,6 @@ skip_size_check:
 				srv_data_file_is_raw_partition[i] != 0);
 	}
 
-	ios = 0;
-
-	mutex_create(ios_mutex_key, &ios_mutex, SYNC_NO_ORDER_CHECK);
-
 	return(DB_SUCCESS);
 }
 
diff --git a/storage/innobase/trx/trx0trx.c b/storage/innobase/trx/trx0trx.c
index 6bae0527b53..7f2ca1f1471 100644
--- a/storage/innobase/trx/trx0trx.c
+++ b/storage/innobase/trx/trx0trx.c
@@ -753,8 +753,7 @@ trx_commit_off_kernel(
 		mutex_enter(&(rseg->mutex));
 
 		if (trx->insert_undo != NULL) {
-			trx_undo_set_state_at_finish(
-				rseg, trx, trx->insert_undo, &mtr);
+			trx_undo_set_state_at_finish(trx->insert_undo, &mtr);
 		}
 
 		undo = trx->update_undo;
@@ -769,7 +768,7 @@ trx_commit_off_kernel(
 			transaction commit for this transaction. */
 
 			update_hdr_page = trx_undo_set_state_at_finish(
-				rseg, trx, undo, &mtr);
+				undo, &mtr);
 
 			/* We have to do the cleanup for the update log while
 			holding the rseg mutex because update log headers
diff --git a/storage/innobase/trx/trx0undo.c b/storage/innobase/trx/trx0undo.c
index 9162c82e423..4021a2ed573 100644
--- a/storage/innobase/trx/trx0undo.c
+++ b/storage/innobase/trx/trx0undo.c
@@ -1798,8 +1798,6 @@ UNIV_INTERN
 page_t*
 trx_undo_set_state_at_finish(
 /*=========================*/
-	trx_rseg_t*	rseg,	/*!< in: rollback segment memory object */
-	trx_t*		trx __attribute__((unused)), /*!< in: transaction */
 	trx_undo_t*	undo,	/*!< in: undo log memory copy */
 	mtr_t*		mtr)	/*!< in: mtr */
 {
@@ -1808,10 +1806,8 @@ trx_undo_set_state_at_finish(
 	page_t*		undo_page;
 	ulint		state;
 
-	ut_ad(trx);
 	ut_ad(undo);
 	ut_ad(mtr);
-	ut_ad(mutex_own(&rseg->mutex));
 
 	if (undo->id >= TRX_RSEG_N_SLOTS) {
 		fprintf(stderr, "InnoDB: Error: undo->id is %lu\n",
@@ -1830,19 +1826,7 @@ trx_undo_set_state_at_finish(
 	    && mach_read_from_2(page_hdr + TRX_UNDO_PAGE_FREE)
 	       < TRX_UNDO_PAGE_REUSE_LIMIT) {
 
-		/* This is a heuristic to avoid the problem of all UNDO
-		slots ending up in one of the UNDO lists. Previously if
-		the server crashed with all the slots in one of the lists,
-		transactions that required the slots of a different type
-		would fail for lack of slots. */
-
-		if (UT_LIST_GET_LEN(rseg->update_undo_list) < 500
-		    && UT_LIST_GET_LEN(rseg->insert_undo_list) < 500) {
-
-			state = TRX_UNDO_CACHED;
-		} else {
-			state = TRX_UNDO_TO_FREE;
-		}
+		state = TRX_UNDO_CACHED;
 
 	} else if (undo->type == TRX_UNDO_INSERT) {