1 /* SPDX-License-Identifier: GPL-2.0 2 * 3 * FUSE: Filesystem in Userspace 4 * Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> 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 struct fuse_req *req; 24 struct iov_iter *iter; 25 struct pipe_buffer *pipebufs; 26 struct pipe_buffer *currbuf; 27 struct pipe_inode_info *pipe; 28 unsigned long nr_segs; 29 struct page *pg; 30 unsigned int len; 31 unsigned int offset; 32 bool write:1; 33 bool move_folios:1; 34 bool is_uring:1; 35 struct { 36 unsigned int copied_sz; /* copied size into the user buffer */ 37 } ring; 38 }; 39 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, bool 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 bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list); 67 68 #endif 69 70