// SPDX-License-Identifier: GPL-2.0
/*
* FUSE: Filesystem in Userspace
* Copyright (c) 2023-2024 DataDirect Networks.
*/
#include "dev.h"
#include "args.h"
#include "dev_uring_i.h"
#include "fuse_trace.h"
#include <linux/fs.h>
#include <linux/io_uring/cmd.h>
static bool __read_mostly enable_uring;
module_param(enable_uring, bool, 0644);
MODULE_PARM_DESC(enable_uring,
"Enable userspace communication through io-uring");
#define FUSE_URING_IOV_SEGS 2 /* header and payload */
#define FUSE_URING_IOV_HEADERS 0
#define FUSE_URING_IOV_PAYLOAD 1
bool fuse_uring_enabled(void)
{
return enable_uring;
}
struct fuse_uring_pdu {
struct fuse_ring_ent *ent;
};
static const struct fuse_iqueue_ops fuse_io_uring_ops;
enum fuse_uring_header_type {
/* struct fuse_in_header / struct fuse_out_header */
FUSE_URING_HEADER_IN_OUT,
/* per op code header */
FUSE_URING_HEADER_OP,
/* struct fuse_uring_ent_in_out header */
FUSE_URING_HEADER_RING_ENT,
};
static void uring_cmd_set_ring_ent(struct io_uring_cmd *cmd,
struct fuse_ring_ent *ring_ent)
{
struct fuse_uring_pdu *pdu =
io_uring_cmd_to_pdu(cmd, struct fuse_uring_pdu);
pdu->ent = ring_ent;
}
static struct fuse_ring_ent *uring_cmd_to_ring_ent(struct io_uring_cmd *cmd)
{
struct fuse_uring_pdu 