refactor: Break ioprio API functions out of the main daemon source

Signed-off-by: Kai Krakow <kai@kaishome.de>

daemon/gamemode-ioprio.c

@@ -29,9 +29,14 @@ POSSIBILITY OF SUCH DAMAGE.
 
  */
 
-#pragma once
-
 #define _GNU_SOURCE
+
+#include "daemon_config.h"
+#include "gamemode.h"
+#include "helpers.h"
+#include "logging.h"
+
+#include <errno.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -80,3 +85,55 @@ static inline int ioprio_set(int which, int who, int ioprio)
 {
 	return (int)syscall(SYS_ioprio_set, which, who, ioprio);
 }
+
+/**
+ * Apply io priorities
+ *
+ * This tries to change the io priority of the client to a value specified
+ * and can possibly reduce lags or latency when a game has to load assets
+ * on demand.
+ */
+void game_mode_apply_ioprio(const GameModeContext *self, const pid_t client)
+{
+	GameModeConfig *config = game_mode_config_from_context(self);
+
+	LOG_MSG("Setting scheduling policies...\n");
+
+	/*
+	 * read configuration "ioprio" (0..7)
+	 */
+	int ioprio = 0;
+	config_get_ioprio_value(config, &ioprio);
+	if (IOPRIO_RESET_DEFAULT == ioprio) {
+		LOG_MSG("IO priority will be reset to default behavior (based on CPU priority).\n");
+		ioprio = 0;
+	} else if (IOPRIO_DONT_SET == ioprio) {
+		return;
+	} else {
+		/* maybe clamp the value */
+		int invalid_ioprio = ioprio;
+		ioprio = CLAMP(0, 7, ioprio);
+		if (ioprio != invalid_ioprio)
+			LOG_ERROR("IO priority value %d invalid, clamping to %d\n", invalid_ioprio, ioprio);
+
+		/* We support only IOPRIO_CLASS_BE as IOPRIO_CLASS_RT required CAP_SYS_ADMIN */
+		ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, ioprio);
+	}
+
+	/*
+	 * Actually apply the io priority
+	 */
+	int c = IOPRIO_PRIO_CLASS(ioprio), p = IOPRIO_PRIO_DATA(ioprio);
+	if (ioprio_set(IOPRIO_WHO_PROCESS, client, ioprio) == 0) {
+		if (0 == ioprio)
+			LOG_MSG("Resetting client [%d] IO priority.\n", client);
+		else
+			LOG_MSG("Setting client [%d] IO priority to (%d,%d).\n", client, c, p);
+	} else {
+		LOG_ERROR("Setting client [%d] IO priority to (%d,%d) failed with error %d, ignoring\n",
+		          client,
+		          c,
+		          p,
+		          errno);
+	}
+}

daemon/gamemode.c

@@ -36,7 +36,6 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "governors-query.h"
 #include "governors.h"
 #include "helpers.h"
-#include "ioprio.h"
 #include "logging.h"
 
 #include <ctype.h>
@@ -159,56 +158,6 @@ void game_mode_context_destroy(GameModeContext *self)
 	pthread_rwlock_destroy(&self->rwlock);
 }
 
-/**
- * Apply io priorities
- *
- * This tries to change the io priority of the client to a value specified
- * and can possibly reduce lags or latency when a game has to load assets
- * on demand.
- */
-static void game_mode_apply_ioprio(GameModeContext *self, pid_t client)
-{
-	LOG_MSG("Setting scheduling policies...\n");
-
-	/*
-	 * read configuration "ioprio" (0..7)
-	 */
-	int ioprio = 0;
-	config_get_ioprio_value(self->config, &ioprio);
-	if (IOPRIO_RESET_DEFAULT == ioprio) {
-		LOG_MSG("IO priority will be reset to default behavior (based on CPU priority).\n");
-		ioprio = 0;
-	} else if (IOPRIO_DONT_SET == ioprio) {
-		return;
-	} else {
-		/* maybe clamp the value */
-		int invalid_ioprio = ioprio;
-		ioprio = CLAMP(0, 7, ioprio);
-		if (ioprio != invalid_ioprio)
-			LOG_ERROR("IO priority value %d invalid, clamping to %d\n", invalid_ioprio, ioprio);
-
-		/* We support only IOPRIO_CLASS_BE as IOPRIO_CLASS_RT required CAP_SYS_ADMIN */
-		ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, ioprio);
-	}
-
-	/*
-	 * Actually apply the io priority
-	 */
-	int c = IOPRIO_PRIO_CLASS(ioprio), p = IOPRIO_PRIO_DATA(ioprio);
-	if (ioprio_set(IOPRIO_WHO_PROCESS, client, ioprio) == 0) {
-		if (0 == ioprio)
-			LOG_MSG("Resetting client [%d] IO priority.\n", client);
-		else
-			LOG_MSG("Setting client [%d] IO priority to (%d,%d).\n", client, c, p);
-	} else {
-		LOG_ERROR("Setting client [%d] IO priority to (%d,%d) failed with error %d, ignoring\n",
-		          client,
-		          c,
-		          p,
-		          errno);
-	}
-}
-
 /**
  * Pivot into game mode.
  *

daemon/gamemode.h

@@ -104,6 +104,12 @@ GameModeConfig *game_mode_config_from_context(const GameModeContext *context);
 char *game_mode_lookup_proc_env(const procfd_t proc_fd, const char *var);
 char *game_mode_lookup_user_home(void);
 
+/** gamemode-ioprio.c
+ * Provides internal API functions specific to adjusting process
+ * IO priorities.
+ */
+void game_mode_apply_ioprio(const GameModeContext *self, const pid_t client);
+
 /** gamemode-proc.c
  * Provides internal API functions specific to working with process
  * environments.

daemon/meson.build

@@ -19,6 +19,7 @@ daemon_sources = [
     'main.c',
     'gamemode.c',
     'gamemode-env.c',
+    'gamemode-ioprio.c',
     'gamemode-proc.c',
     'gamemode-sched.c',
     'daemonize.c',