// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2019 Samsung Electronics Co., Ltd.
 */

#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include "server.h"
#include "connection.h"
#include "ksmbd_work.h"
#include "mgmt/ksmbd_ida.h"

static struct kmem_cache *work_cache;
static struct workqueue_struct *ksmbd_wq;

struct ksmbd_work *ksmbd_alloc_work_struct(void)
{
	struct ksmbd_work *work = kmem_cache_zalloc(work_cache, GFP_KERNEL);

	if (work) {
		work->compound_fid = KSMBD_NO_FID;
		work->compound_pfid = KSMBD_NO_FID;
		INIT_LIST_HEAD(&work->request_entry);
		INIT_LIST_HEAD(&work->async_request_entry);
		INIT_LIST_HEAD(&work->fp_entry);
		INIT_LIST_HEAD(&work->interim_entry);
	}
	return work;
}

void ksmbd_free_work_struct(struct ksmbd_work *work)
{
	WARN_ON(work->saved_cred != NULL);

	kvfree(work->response_buf);
	kvfree(work->aux_payload_buf);
	kfree(work->tr_buf);
	kvfree(work->request_buf);
	if (work->async_id)
		ksmbd_release_id(&work->conn->async_ida, work->async_id);
	kmem_cache_free(work_cache, work);
}

void ksmbd_work_pool_destroy(void)
{
	kmem_cache_destroy(work_cache);
}

int ksmbd_work_pool_init(void)
{
	work_cache = kmem_cache_create("ksmbd_work_cache",
				       sizeof(struct ksmbd_work), 0,
				       SLAB_HWCACHE_ALIGN, NULL);
	if (!work_cache)
		return -ENOMEM;
	return 0;
}

int ksmbd_workqueue_init(void)
{
	ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0);
	if (!ksmbd_wq)
		return -ENOMEM;
	return 0;
}

void ksmbd_workqueue_destroy(void)
{
	flush_workqueue(ksmbd_wq);
	destroy_workqueue(ksmbd_wq);
	ksmbd_wq = NULL;
}

bool ksmbd_queue_work(struct ksmbd_work *work)
{
	return queue_work(ksmbd_wq, &work->work);
}