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 extern struct wait_queue_head fuse_dev_waitq; 16 17 struct fuse_arg; 18 struct fuse_args; 19 struct fuse_pqueue; 20 struct fuse_req; 21 struct fuse_iqueue; 22 struct fuse_forget_link; 23 24 struct fuse_copy_state { 25 struct fuse_req *req; 26 struct iov_iter *iter; 27 struct pipe_buffer *pipebufs; 28 struct pipe_buffer *currbuf; 29 struct pipe_inode_info *pipe; 30 unsigned long nr_segs; 31 struct page *pg; 32 unsigned int len; 33 unsigned int offset; 34 bool write:1; 35 bool move_folios:1; 36 bool is_uring:1; 37 struct { 38 unsigned int copied_sz; /* copied size into the user buffer */ 39 } ring; 40 }; 41 42 #define FUSE_DEV_SYNC_INIT ((struct fuse_dev *) 1) 43 #define FUSE_DEV_PTR_MASK (~1UL) 44 45 static inline struct fuse_dev *__fuse_get_dev(struct file *file) 46 { 47 /* 48 * Lockless access is OK, because file->private data is set 49 * once during mount and is valid until the file is released. 50 */ 51 struct fuse_dev *fud = READ_ONCE(file->private_data); 52 53 return (typeof(fud)) ((unsigned long) fud & FUSE_DEV_PTR_MASK); 54 } 55 56 struct fuse_dev *fuse_get_dev(struct file *file); 57 58 unsigned int fuse_req_hash(u64 unique); 59 struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique); 60 61 void fuse_dev_end_requests(struct list_head *head); 62 63 void fuse_copy_init(struct fuse_copy_state *cs, bool write, 64 struct iov_iter *iter); 65 int fuse_copy_args(struct fuse_copy_state *cs, unsigned int numargs, 66 unsigned int argpages, struct fuse_arg *args, 67 int zeroing); 68 int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args, 69 unsigned int nbytes); 70 void fuse_dev_queue_forget(struct fuse_iqueue *fiq, 71 struct fuse_forget_link *forget); 72 void fuse_dev_queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req); 73 bool fuse_remove_pending_req(struct fuse_req *req, spinlock_t *lock); 74 75 bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list); 76 77 #endif 78 79