1 #ifndef _LINUX_SUNRPC_RPC_PIPE_FS_H
2 #define _LINUX_SUNRPC_RPC_PIPE_FS_H
3 
4 #ifdef __KERNEL__
5 
6 #include <linux/workqueue.h>
7 
8 struct rpc_pipe_msg {
9 	struct list_head list;
10 	void *data;
11 	size_t len;
12 	size_t copied;
13 	int errno;
14 };
15 
16 struct rpc_pipe_ops {
17 	ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
18 	ssize_t (*downcall)(struct file *, const char __user *, size_t);
19 	void (*release_pipe)(struct inode *);
20 	int (*open_pipe)(struct inode *);
21 	void (*destroy_msg)(struct rpc_pipe_msg *);
22 };
23 
24 struct rpc_inode {
25 	struct inode vfs_inode;
26 	void *private;
27 	struct list_head pipe;
28 	struct list_head in_upcall;
29 	struct list_head in_downcall;
30 	int pipelen;
31 	int nreaders;
32 	int nwriters;
33 	int nkern_readwriters;
34 	wait_queue_head_t waitq;
35 #define RPC_PIPE_WAIT_FOR_OPEN	1
36 	int flags;
37 	struct delayed_work queue_timeout;
38 	const struct rpc_pipe_ops *ops;
39 };
40 
41 static inline struct rpc_inode *
42 RPC_I(struct inode *inode)
43 {
44 	return container_of(inode, struct rpc_inode, vfs_inode);
45 }
46 
47 extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
48 				       char __user *, size_t);
49 extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);
50 
51 struct rpc_clnt;
52 extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
53 extern int rpc_remove_client_dir(struct dentry *);
54 
55 struct cache_detail;
56 extern struct dentry *rpc_create_cache_dir(struct dentry *,
57 					   struct qstr *,
58 					   mode_t umode,
59 					   struct cache_detail *);
60 extern void rpc_remove_cache_dir(struct dentry *);
61 
62 extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *,
63 				 const struct rpc_pipe_ops *, int flags);
64 extern int rpc_unlink(struct dentry *);
65 extern struct vfsmount *rpc_get_mount(void);
66 extern void rpc_put_mount(void);
67 extern int register_rpc_pipefs(void);
68 extern void unregister_rpc_pipefs(void);
69 
70 #endif
71 #endif
72