MDEV-14180 preparation: Rename key_rotation_list

- Rename the rotation list to default_encrypt_tables in
fil_system_t. Because rotation list naming could be
misleading when it comes to key version rotation

- Rename is_in_rotation_list to is_in_default_encrypt
in fil_space_t

- Rename keyrotate_next function to default_encrypt_next

fil_system_t::default_encrypt_next(): Find the next
suitable default encrypt table if beginning of
default_encrypt_tables list has been scheduled
to be deleted

storage/innobase/fil/fil0crypt.cc

@@ -1380,52 +1380,65 @@ fil_crypt_return_iops(
 	fil_crypt_update_total_stat(state);
 }
 
-/** Return the next tablespace from rotation_list.
+/** Return the next tablespace from default_encrypt_tables.
 @param space   previous tablespace (NULL to start from the start)
 @param recheck whether the removal condition needs to be rechecked after
 the encryption parameters were changed
 @param encrypt expected state of innodb_encrypt_tables
 @return the next tablespace to process (n_pending_ops incremented)
 @retval NULL if this was the last */
-inline fil_space_t *fil_system_t::keyrotate_next(fil_space_t *space,
-                                                 bool recheck, bool encrypt)
+inline fil_space_t *fil_system_t::default_encrypt_next(
+  fil_space_t *space, bool recheck, bool encrypt)
 {
   ut_ad(mutex_own(&mutex));
 
   sized_ilist<fil_space_t, rotation_list_tag_t>::iterator it=
-    space && space->is_in_rotation_list ? space : rotation_list.begin();
+    space && space->is_in_default_encrypt
+    ? space
+    : default_encrypt_tables.begin();
   const sized_ilist<fil_space_t, rotation_list_tag_t>::iterator end=
-    rotation_list.end();
+    default_encrypt_tables.end();
 
   if (space)
   {
     const bool released= !--space->n_pending_ops;
 
-    if (space->is_in_rotation_list)
+    if (space->is_in_default_encrypt)
     {
       while (++it != end &&
              (!UT_LIST_GET_LEN(it->chain) || it->is_stopping()));
 
-      /* If one of the encryption threads already started the encryption
-      of the table then don't remove the unencrypted spaces from rotation list
+      /* If one of the encryption threads already started
+      the encryption of the table then don't remove the
+      unencrypted spaces from default encrypt list.
 
-      If there is a change in innodb_encrypt_tables variables value then
-      don't remove the last processed tablespace from the rotation list. */
+      If there is a change in innodb_encrypt_tables variables
+      value then don't remove the last processed tablespace
+      from the default encrypt list. */
       if (released && (!recheck || space->crypt_data) &&
           !encrypt == !srv_encrypt_tables)
       {
-        ut_a(!rotation_list.empty());
-        rotation_list.remove(*space);
-        space->is_in_rotation_list= false;
+        ut_a(!default_encrypt_tables.empty());
+        default_encrypt_tables.remove(*space);
+        space->is_in_default_encrypt= false;
       }
     }
   }
+  else while (it != end &&
+	      (!UT_LIST_GET_LEN(it->chain) || it->is_stopping()))
+  {
+    /* Find the next suitable default encrypt table if
+    beginning of default_encrypt_tables list has been scheduled
+    to be deleted */
+    it++;
+  }
 
   if (it == end)
     return NULL;
 
   space= &*it;
   space->n_pending_ops++;
+  ut_ad(!space->is_stopping());
   return space;
 }
 
@@ -1443,7 +1456,7 @@ static fil_space_t *fil_space_next(fil_space_t *space, bool recheck,
   ut_ad(!space || space->n_pending_ops);
 
   if (!srv_fil_crypt_rotate_key_age)
-    space= fil_system->keyrotate_next(space, recheck, encrypt);
+    space= fil_system->default_encrypt_next(space, recheck, encrypt);
   else if (!space)
   {
     space= UT_LIST_GET_FIRST(fil_system->space_list);
@@ -2335,9 +2348,9 @@ fil_crypt_set_thread_cnt(
 	}
 }
 
-/** Initialize the tablespace rotation_list
+/** Initialize the tablespace default_encrypt_tables
 if innodb_encryption_rotate_key_age=0. */
-static void fil_crypt_rotation_list_fill()
+static void fil_crypt_default_encrypt_tables_fill()
 {
 	ut_ad(mutex_own(&fil_system->mutex));
 
@@ -2345,7 +2358,7 @@ static void fil_crypt_rotation_list_fill()
 	     space != NULL;
 	     space = UT_LIST_GET_NEXT(space_list, space)) {
 		if (space->purpose != FIL_TYPE_TABLESPACE
-		    || space->is_in_rotation_list
+		    || space->is_in_default_encrypt
 		    || space->is_stopping()
 		    || UT_LIST_GET_LEN(space->chain) == 0) {
 			continue;
@@ -2389,8 +2402,8 @@ static void fil_crypt_rotation_list_fill()
 			}
 		}
 
-		fil_system->rotation_list.push_back(*space);
-		space->is_in_rotation_list = true;
+		fil_system->default_encrypt_tables.push_back(*space);
+		space->is_in_default_encrypt = true;
 	}
 }
 
@@ -2405,7 +2418,7 @@ fil_crypt_set_rotate_key_age(
 	mutex_enter(&fil_system->mutex);
 	srv_fil_crypt_rotate_key_age = val;
 	if (val == 0) {
-		fil_crypt_rotation_list_fill();
+		fil_crypt_default_encrypt_tables_fill();
 	}
 	mutex_exit(&fil_system->mutex);
 	os_event_set(fil_crypt_threads_event);
@@ -2436,7 +2449,7 @@ fil_crypt_set_encrypt_tables(
 	srv_encrypt_tables = val;
 
 	if (srv_fil_crypt_rotate_key_age == 0) {
-		fil_crypt_rotation_list_fill();
+		fil_crypt_default_encrypt_tables_fill();
 	}
 
 	mutex_exit(&fil_system->mutex);

storage/innobase/fil/fil0fil.cc

@@ -1244,10 +1244,9 @@ fil_space_detach(
 		space->is_in_unflushed_spaces = false;
 	}
 
-	if (space->is_in_rotation_list) {
-
-		fil_system->rotation_list.remove(*space);
-		space->is_in_rotation_list = false;
+	if (space->is_in_default_encrypt) {
+		fil_system->default_encrypt_tables.remove(*space);
+		space->is_in_default_encrypt = false;
 	}
 
 	UT_LIST_REMOVE(fil_system->space_list, space);
@@ -1473,8 +1472,8 @@ fil_space_create(
 		    srv_encrypt_tables)) {
 		/* Key rotation is not enabled, need to inform background
 		encryption threads. */
-		fil_system->rotation_list.push_back(*space);
-		space->is_in_rotation_list = true;
+		fil_system->default_encrypt_tables.push_back(*space);
+		space->is_in_default_encrypt = true;
 		mutex_exit(&fil_system->mutex);
 		mutex_enter(&fil_crypt_threads_mutex);
 		os_event_set(fil_crypt_threads_event);

storage/innobase/include/fil0fil.h

@@ -177,7 +177,7 @@ struct fil_space_t : ilist_node<unflushed_spaces_tag_t>,
 	bool is_in_unflushed_spaces;
 
 	/** Checks that this tablespace needs key rotation. */
-	bool is_in_rotation_list;
+	bool is_in_default_encrypt;
 
 	/** True if the device this filespace is on supports atomic writes */
 	bool		atomic_write_supported;
@@ -541,9 +541,9 @@ struct fil_system_t {
 					record has been written since
 					the latest redo log checkpoint.
 					Protected only by log_sys->mutex. */
-	ilist<fil_space_t, rotation_list_tag_t> rotation_list;
-					/*!< list of all file spaces needing
-					key rotation.*/
+
+	/** List of all file spaces need key rotation */
+	ilist<fil_space_t, rotation_list_tag_t> default_encrypt_tables;
 
 	bool		space_id_reuse_warned;
 					/* !< TRUE if fil_space_create()
@@ -556,15 +556,15 @@ struct fil_system_t {
 	@retval	NULL	if the tablespace does not exist or cannot be read */
 	fil_space_t* read_page0(ulint id);
 
-  /** Return the next tablespace from rotation_list.
+  /** Return the next tablespace from default_encrypt_tables list.
   @param space   previous tablespace (NULL to start from the start)
   @param recheck whether the removal condition needs to be rechecked after
   the encryption parameters were changed
   @param encrypt expected state of innodb_encrypt_tables
   @return the next tablespace to process (n_pending_ops incremented)
   @retval NULL if this was the last */
-  inline fil_space_t* keyrotate_next(fil_space_t *space, bool recheck,
-                                     bool encrypt);
+  inline fil_space_t* default_encrypt_next(
+    fil_space_t *space, bool recheck, bool encrypt);
 };
 
 /** The tablespace memory cache. This variable is NULL before the module is