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 20 struct fuse_copy_state { 21 int write; 22 struct fuse_req *req; 23 struct iov_iter *iter; 24 struct pipe_buffer *pipebufs; 25 struct pipe_buffer *currbuf; 26 struct pipe_inode_info *pipe; 27 unsigned long nr_segs; 28 struct page *pg; 29 unsigned int len; 30 unsigned int offset; 31 unsigned int move_pages:1; 32 unsigned int is_uring:1; 33 struct { 34 unsigned int copied_sz; /* copied size into the user buffer */ 35 } ring; 36 }; 37 38 static inline struct fuse_dev *fuse_get_dev(struct file *file) 39 { 40 /* 41 * Lockless access is OK, because file->private data is set 42 * once during mount and is valid until the file is released. 43 */ 44 return READ_ONCE(file->private_data); 45 } 46 47 unsigned int fuse_req_hash(u64 unique); 48 struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique); 49 50 void fuse_dev_end_requests(struct list_head *head); 51 52 void fuse_copy_init(struct fuse_copy_state *cs, int write, 53 struct iov_iter *iter); 54 int fuse_copy_args(struct fuse_copy_state *cs, unsigned int numargs, 55 unsigned int argpages, struct fuse_arg *args, 56 int zeroing); 57 int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args, 58 unsigned int nbytes); 59 60 #endif 61 62