static int virtio_mem_bbm_plug_request()

in virtio_mem.c [1812:1851]

• 32 lines of code
• 11 McCabe index (conditional complexity)

static int virtio_mem_bbm_plug_request(struct virtio_mem *vm, uint64_t diff)
{
	uint64_t nb_bb = diff / vm->bbm.bb_size;
	unsigned long bb_id;
	int rc;

	if (!nb_bb)
		return 0;

	/* Try to plug and add unused big blocks */
	virtio_mem_bbm_for_each_bb(vm, bb_id, VIRTIO_MEM_BBM_BB_UNUSED) {
		if (!virtio_mem_could_add_memory(vm, vm->bbm.bb_size))
			return -ENOSPC;

		rc = virtio_mem_bbm_plug_and_add_bb(vm, bb_id);
		if (!rc)
			nb_bb--;
		if (rc || !nb_bb)
			return rc;
		cond_resched();
	}

	/* Try to prepare, plug and add new big blocks */
	while (nb_bb) {
		if (!virtio_mem_could_add_memory(vm, vm->bbm.bb_size))
			return -ENOSPC;

		rc = virtio_mem_bbm_prepare_next_bb(vm, &bb_id);
		if (rc)
			return rc;
		rc = virtio_mem_bbm_plug_and_add_bb(vm, bb_id);
		if (!rc)
			nb_bb--;
		if (rc)
			return rc;
		cond_resched();
	}

	return 0;
}