blockdev: transactions: rename some things

Look at qmp_transaction(): dev_list is not obvious name for list of
actions. Let's look at qapi spec, this argument is "actions". Let's
follow the common practice of using same argument names in qapi scheme
and code.

To be honest, rename props to properties for same reason.

Next, we have to rename global map of actions, to not conflict with new
name for function argument.

Rename also dev_entry loop variable accordingly to new name of the
list.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230510150624.310640-3-vsementsov@yandex-team.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

blockdev.c

@@ -2291,7 +2291,7 @@ static void abort_commit(void *opaque)
     g_assert_not_reached(); /* this action never succeeds */
 }
 
-static const BlkActionOps actions[] = {
+static const BlkActionOps actions_map[] = {
     [TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT] = {
         .instance_size = sizeof(ExternalSnapshotState),
         .action  = external_snapshot_action,
@@ -2373,12 +2373,12 @@ static TransactionProperties *get_transaction_properties(
  *
  * Always run under BQL.
  */
-void qmp_transaction(TransactionActionList *dev_list,
-                     struct TransactionProperties *props,
+void qmp_transaction(TransactionActionList *actions,
+                     struct TransactionProperties *properties,
                      Error **errp)
 {
-    TransactionActionList *dev_entry = dev_list;
-    bool has_props = !!props;
+    TransactionActionList *act = actions;
+    bool has_properties = !!properties;
     JobTxn *block_job_txn = NULL;
     Error *local_err = NULL;
     Transaction *tran = tran_new();
@@ -2388,33 +2388,33 @@ void qmp_transaction(TransactionActionList *dev_list,
     /* Does this transaction get canceled as a group on failure?
      * If not, we don't really need to make a JobTxn.
      */
-    props = get_transaction_properties(props);
-    if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
+    properties = get_transaction_properties(properties);
+    if (properties->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
         block_job_txn = job_txn_new();
     }
 
     /* drain all i/o before any operations */
     bdrv_drain_all();
 
     /* We don't do anything in this loop that commits us to the operations */
-    while (NULL != dev_entry) {
+    while (NULL != act) {
         TransactionAction *dev_info = NULL;
         const BlkActionOps *ops;
         BlkActionState *state;
 
-        dev_info = dev_entry->value;
-        dev_entry = dev_entry->next;
+        dev_info = act->value;
+        act = act->next;
 
-        assert(dev_info->type < ARRAY_SIZE(actions));
+        assert(dev_info->type < ARRAY_SIZE(actions_map));
 
-        ops = &actions[dev_info->type];
+        ops = &actions_map[dev_info->type];
         assert(ops->instance_size > 0);
 
         state = g_malloc0(ops->instance_size);
         state->ops = ops;
         state->action = dev_info;
         state->block_job_txn = block_job_txn;
-        state->txn_props = props;
+        state->txn_props = properties;
 
         state->ops->action(state, tran, &local_err);
         if (local_err) {
@@ -2432,8 +2432,8 @@ void qmp_transaction(TransactionActionList *dev_list,
     /* failure, and it is all-or-none; roll back all operations */
     tran_abort(tran);
 exit:
-    if (!has_props) {
-        qapi_free_TransactionProperties(props);
+    if (!has_properties) {
+        qapi_free_TransactionProperties(properties);
     }
     job_txn_unref(block_job_txn);
 }