| 1 | /* SPDX-License-Identifier: GPL-2.0 |
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| 2 | * |
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| 3 | * FUSE: Filesystem in Userspace |
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| 4 | * Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
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| 5 | */ |
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| 6 | #ifndef _FS_FUSE_DEV_I_H |
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| 7 | #define _FS_FUSE_DEV_I_H |
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| 8 | |
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| 9 | #include <linux/types.h> |
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| 10 | |
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| 11 | /* Ordinary requests have even IDs, while interrupts IDs are odd */ |
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| 12 | #define FUSE_INT_REQ_BIT (1ULL << 0) |
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| 13 | #define FUSE_REQ_ID_STEP (1ULL << 1) |
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| 14 | |
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| 15 | extern struct wait_queue_head fuse_dev_waitq; |
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| 16 | |
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| 17 | struct fuse_arg; |
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| 18 | struct fuse_args; |
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| 19 | struct fuse_pqueue; |
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| 20 | struct fuse_req; |
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| 21 | struct fuse_iqueue; |
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| 22 | struct fuse_forget_link; |
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| 23 | |
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| 24 | struct fuse_copy_state { |
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| 25 | struct fuse_req *req; |
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| 26 | struct iov_iter *iter; |
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| 27 | struct pipe_buffer *pipebufs; |
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| 28 | struct pipe_buffer *currbuf; |
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| 29 | struct pipe_inode_info *pipe; |
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| 30 | unsigned long nr_segs; |
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| 31 | struct page *pg; |
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| 32 | unsigned int len; |
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| 33 | unsigned int offset; |
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| 34 | bool write:1; |
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| 35 | bool move_folios:1; |
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| 36 | bool is_uring:1; |
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| 37 | struct { |
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| 38 | unsigned int copied_sz; /* copied size into the user buffer */ |
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| 39 | } ring; |
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| 40 | }; |
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| 41 | |
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| 42 | #define FUSE_DEV_SYNC_INIT ((struct fuse_dev *) 1) |
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| 43 | #define FUSE_DEV_PTR_MASK (~1UL) |
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| 44 | |
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| 45 | static inline struct fuse_dev *__fuse_get_dev(struct file *file) |
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| 46 | { |
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| 47 | /* |
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| 48 | * Lockless access is OK, because file->private data is set |
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| 49 | * once during mount and is valid until the file is released. |
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| 50 | */ |
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| 51 | struct fuse_dev *fud = READ_ONCE(file->private_data); |
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| 52 | |
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| 53 | return (typeof(fud)) ((unsigned long) fud & FUSE_DEV_PTR_MASK); |
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| 54 | } |
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| 55 | |
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| 56 | struct fuse_dev *fuse_get_dev(struct file *file); |
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| 57 | |
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| 58 | unsigned int fuse_req_hash(u64 unique); |
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| 59 | struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique); |
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| 60 | |
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| 61 | void fuse_dev_end_requests(struct list_head *head); |
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| 62 | |
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| 63 | void fuse_copy_init(struct fuse_copy_state *cs, bool write, |
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| 64 | struct iov_iter *iter); |
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| 65 | void fuse_copy_finish(struct fuse_copy_state *cs); |
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| 66 | int fuse_copy_args(struct fuse_copy_state *cs, unsigned int numargs, |
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| 67 | unsigned int argpages, struct fuse_arg *args, |
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| 68 | int zeroing); |
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| 69 | int fuse_copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args, |
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| 70 | unsigned int nbytes); |
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| 71 | void fuse_dev_queue_forget(struct fuse_iqueue *fiq, |
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| 72 | struct fuse_forget_link *forget); |
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| 73 | void fuse_dev_queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req); |
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| 74 | bool fuse_remove_pending_req(struct fuse_req *req, spinlock_t *lock); |
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| 75 | |
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| 76 | bool fuse_request_expired(struct fuse_conn *fc, struct list_head *list); |
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| 77 | |
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| 78 | #endif |
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| 79 | |
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| 80 | |
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