1 /* SPDX-License-Identifier: GPL-2.0
2 *
3 * FUSE: Filesystem in Userspace
4 * Copyright (C) 2001-2008 Miklos Szeredi <[email protected]>
5 */
6 #ifndef _FS_FUSE_DEV_I_H
7 #define _FS_FUSE_DEV_I_H
8
9 #include <linux/types.h>
10
11 /* Ordinary requests have even IDs, while interrupts IDs are odd */
12 #define FUSE_INT_REQ_BIT (1ULL << 0)
13 #define FUSE_REQ_ID_STEP (1ULL << 1)
14
15 struct fuse_arg;
16 struct fuse_args;
17 struct fuse_pqueue;
18 struct fuse_req;
19 struct fuse_iqueue;
20 struct fuse_forget_link;
21
22 struct fuse_copy_state {
23 int write;
24 struct fuse_req *req;
25 struct iov_iter *iter;
26 struct pipe_buffer *pipebufs;
27 struct pipe_buffer *currbuf;
28 struct pipe_inode_info *pipe;
29 unsigned long nr_segs;
30 struct page *pg;
31 unsigned int len;
32 unsigned int offset;
33 unsigned int move_pages:1;
34 unsigned int is_uring:1;
35 struct {
36 unsigned int copied_sz; /* copied size into the user buffer */
37 } ring;
38 };
39
fuse_get_dev(struct file * file)40 static inline struct fuse_dev *fuse_get_dev(struct file *file)
41 {
42 /*
43 * Lockless access is OK, because file->private data is set
44 * once during mount and is valid until the file is released.
45 */
46 return READ_ONCE(file->private_data);
47 }
48
49 unsigned int fuse_req_hash(u64 unique);
50 struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique);
51
52 void fuse_dev_end_requests(struct list_head *head);
53
54 void fuse_copy_init(struct fuse_copy_state *cs, int write,
55 struct iov_iter *iter);
56 int fuse_copy_args(struct fuse_copy_state *cs, unsigned int numargs,
57 unsigned int argpages, struct fuse_arg *args,
58 int zeroing);
59 int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args,
60 unsigned int nbytes);
61 void fuse_dev_queue_forget(struct fuse_iqueue *fiq,
62 struct fuse_forget_link *forget);
63 void fuse_dev_queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req);
64 bool fuse_remove_pending_req(struct fuse_req *req, spinlock_t *lock);
65
66 #endif
67
68