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/* SPDX-License-Identifier: GPL-2.0
*
* FUSE: Filesystem in Userspace
* Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
*/
#ifndef _FS_FUSE_DEV_I_H
#define _FS_FUSE_DEV_I_H
#include <linux/types.h>
/* Ordinary requests have even IDs, while interrupts IDs are odd */
#define FUSE_INT_REQ_BIT (1ULL << 0)
#define FUSE_REQ_ID_STEP (1ULL << 1)
struct fuse_arg;
struct fuse_args;
struct fuse_pqueue;
struct fuse_req;
struct fuse_iqueue;
struct fuse_forget_link;
struct fuse_copy_state {
int write;
struct fuse_req *req;
struct iov_iter *iter;
struct pipe_buffer *pipebufs;
struct pipe_buffer *currbuf;
struct pipe_inode_info *pipe;
unsigned long nr_segs;
struct page *pg;
unsigned int len;
unsigned int offset;
unsigned int move_pages:1;
unsigned int is_uring:1;
struct {
unsigned int copied_sz; /* copied size into the user buffer */
} ring;
};
static inline struct fuse_dev *fuse_get_dev(struct file *file)
{
/*
* Lockless access is OK, because file->private data is set
* once during mount and is valid until the file is released.
*/
return READ_ONCE(file->private_data);
}
unsigned int fuse_req_hash(u64 unique);
struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique);
void fuse_dev_end_requests(struct list_head *head);
void fuse_copy_init(struct fuse_copy_state *cs, int write,
struct iov_iter *iter);
int fuse_copy_args(struct fuse_copy_state *cs, unsigned int numargs,
unsigned int argpages, struct fuse_arg *args,
int zeroing);
int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args,
unsigned int nbytes);
void fuse_dev_queue_forget(struct fuse_iqueue *fiq,
struct fuse_forget_link *forget);
void fuse_dev_queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req);
bool fuse_remove_pending_req(struct fuse_req *req, spinlock_t *lock);
bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list);
bool fuse_fpq_processing_expired(struct fuse_conn *fc, struct list_head *processing);
#endif
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