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_pipe {
25 	struct list_head pipe;
26 	struct list_head in_upcall;
27 	struct list_head in_downcall;
28 	int pipelen;
29 	int nreaders;
30 	int nwriters;
31 #define RPC_PIPE_WAIT_FOR_OPEN	1
32 	int flags;
33 	struct delayed_work queue_timeout;
34 	const struct rpc_pipe_ops *ops;
35 	spinlock_t lock;
36 	struct dentry *dentry;
37 };
38 
39 struct rpc_inode {
40 	struct inode vfs_inode;
41 	void *private;
42 	struct rpc_pipe *pipe;
43 	wait_queue_head_t waitq;
44 };
45 
46 static inline struct rpc_inode *
47 RPC_I(struct inode *inode)
48 {
49 	return container_of(inode, struct rpc_inode, vfs_inode);
50 }
51 
52 enum {
53 	SUNRPC_PIPEFS_NFS_PRIO,
54 	SUNRPC_PIPEFS_RPC_PRIO,
55 };
56 
57 extern int rpc_pipefs_notifier_register(struct notifier_block *);
58 extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
59 
60 enum {
61 	RPC_PIPEFS_MOUNT,
62 	RPC_PIPEFS_UMOUNT,
63 };
64 
65 extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
66 				      const unsigned char *dir_name);
67 extern void rpc_pipefs_init_net(struct net *net);
68 extern struct super_block *rpc_get_sb_net(const struct net *net);
69 extern void rpc_put_sb_net(const struct net *net);
70 
71 extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
72 				       char __user *, size_t);
73 extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
74 
75 struct rpc_clnt;
76 extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
77 extern int rpc_remove_client_dir(struct dentry *);
78 
79 struct cache_detail;
80 extern struct dentry *rpc_create_cache_dir(struct dentry *,
81 					   struct qstr *,
82 					   umode_t umode,
83 					   struct cache_detail *);
84 extern void rpc_remove_cache_dir(struct dentry *);
85 
86 extern int rpc_rmdir(struct dentry *dentry);
87 
88 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
89 void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
90 extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
91 					struct rpc_pipe *);
92 extern int rpc_unlink(struct dentry *);
93 extern int register_rpc_pipefs(void);
94 extern void unregister_rpc_pipefs(void);
95 
96 #endif
97 #endif
98