blkdebug: track all actions

Add a counter for each action that a rule can trigger.
This is mainly used to keep track of how many coroutine_yield()
we need to perform after processing all rules in the list.

Co-developed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210614082931.24925-4-eesposit@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

block/blkdebug.c

@@ -74,6 +74,7 @@ enum {
     ACTION_INJECT_ERROR,
     ACTION_SET_STATE,
     ACTION_SUSPEND,
+    ACTION__MAX,
 };
 
 typedef struct BlkdebugRule {
@@ -791,22 +792,22 @@ static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule)
     qemu_coroutine_yield();
 }
 
-static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
-    bool injected)
+static void process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
+                         int *action_count)
 {
     BDRVBlkdebugState *s = bs->opaque;
 
     /* Only process rules for the current state */
     if (rule->state && rule->state != s->state) {
-        return injected;
+        return;
     }
 
     /* Take the action */
+    action_count[rule->action]++;
     switch (rule->action) {
     case ACTION_INJECT_ERROR:
-        if (!injected) {
+        if (action_count[ACTION_INJECT_ERROR] == 1) {
             QSIMPLEQ_INIT(&s->active_rules);
-            injected = true;
         }
         QSIMPLEQ_INSERT_HEAD(&s->active_rules, rule, active_next);
         break;
@@ -819,21 +820,19 @@ static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule,
         suspend_request(bs, rule);
         break;
     }
-    return injected;
 }
 
 static void blkdebug_debug_event(BlockDriverState *bs, BlkdebugEvent event)
 {
     BDRVBlkdebugState *s = bs->opaque;
     struct BlkdebugRule *rule, *next;
-    bool injected;
+    int actions_count[ACTION__MAX] = { 0 };
 
     assert((int)event >= 0 && event < BLKDBG__MAX);
 
-    injected = false;
     s->new_state = s->state;
     QLIST_FOREACH_SAFE(rule, &s->rules[event], next, next) {
-        injected = process_rule(bs, rule, injected);
+        process_rule(bs, rule, actions_count);
     }
     s->state = s->new_state;
 }