feat: Massive OS expansion with IPC, Sound & TTS, Block layer, FAT32/ext2/sysfs, Signals, Syscalls, Modules, Drivers & 50+ LazyBox applets

block/elevator.c

@@ -0,0 +1,47 @@
+#include <block/elevator.h>
+#include <kernel/printk.h>
+
+static void noop_queue_request(block_device_t* dev, block_request_t* req) {
+    if (!dev || !req) return;
+    req->next = NULL;
+    if (!dev->queue_tail) {
+        dev->queue_head = req;
+        dev->queue_tail = req;
+    } else {
+        dev->queue_tail->next = req;
+        dev->queue_tail = req;
+    }
+}
+
+static block_request_t* noop_dispatch_request(block_device_t* dev) {
+    if (!dev || !dev->queue_head) return NULL;
+    block_request_t* req = dev->queue_head;
+    dev->queue_head = req->next;
+    if (!dev->queue_head) {
+        dev->queue_tail = NULL;
+    }
+    return req;
+}
+
+static elevator_t noop_elevator = {
+    .type = ELEVATOR_NOOP,
+    .name = "noop",
+    .queue_request = noop_queue_request,
+    .dispatch_request = noop_dispatch_request
+};
+
+static elevator_t* current_elevator = &noop_elevator;
+
+void elevator_init(void) {
+    current_elevator = &noop_elevator;
+    printk(KERN_INFO "ELEVATOR: Initialized default '%s' I/O scheduler\n", current_elevator->name);
+}
+
+elevator_t* elevator_get_active(void) {
+    return current_elevator;
+}
+
+void elevator_set_scheduler(elevator_type_t type) {
+    (void)type;
+    current_elevator = &noop_elevator;
+}