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
8struct rpc_pipe_dir_head {
9	struct list_head pdh_entries;
10	struct dentry *pdh_dentry;
11};
12
13struct rpc_pipe_dir_object_ops;
14struct rpc_pipe_dir_object {
15	struct list_head pdo_head;
16	const struct rpc_pipe_dir_object_ops *pdo_ops;
17
18	void *pdo_data;
19};
20
21struct rpc_pipe_dir_object_ops {
22	int (*create)(struct dentry *dir,
23			struct rpc_pipe_dir_object *pdo);
24	void (*destroy)(struct dentry *dir,
25			struct rpc_pipe_dir_object *pdo);
26};
27
28struct rpc_pipe_msg {
29	struct list_head list;
30	void *data;
31	size_t len;
32	size_t copied;
33	int errno;
34};
35
36struct rpc_pipe_ops {
37	ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
38	ssize_t (*downcall)(struct file *, const char __user *, size_t);
39	void (*release_pipe)(struct inode *);
40	int (*open_pipe)(struct inode *);
41	void (*destroy_msg)(struct rpc_pipe_msg *);
42};
43
44struct rpc_pipe {
45	struct list_head pipe;
46	struct list_head in_upcall;
47	struct list_head in_downcall;
48	int pipelen;
49	int nreaders;
50	int nwriters;
51#define RPC_PIPE_WAIT_FOR_OPEN	1
52	int flags;
53	struct delayed_work queue_timeout;
54	const struct rpc_pipe_ops *ops;
55	spinlock_t lock;
56	struct dentry *dentry;
57};
58
59struct rpc_inode {
60	struct inode vfs_inode;
61	void *private;
62	struct rpc_pipe *pipe;
63	wait_queue_head_t waitq;
64};
65
66static inline struct rpc_inode *
67RPC_I(struct inode *inode)
68{
69	return container_of(inode, struct rpc_inode, vfs_inode);
70}
71
72enum {
73	SUNRPC_PIPEFS_NFS_PRIO,
74	SUNRPC_PIPEFS_RPC_PRIO,
75};
76
77extern int rpc_pipefs_notifier_register(struct notifier_block *);
78extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
79
80enum {
81	RPC_PIPEFS_MOUNT,
82	RPC_PIPEFS_UMOUNT,
83};
84
85extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
86				      const unsigned char *dir_name);
87extern int rpc_pipefs_init_net(struct net *net);
88extern void rpc_pipefs_exit_net(struct net *net);
89extern struct super_block *rpc_get_sb_net(const struct net *net);
90extern void rpc_put_sb_net(const struct net *net);
91
92extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
93				       char __user *, size_t);
94extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
95
96struct rpc_clnt;
97extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
98extern int rpc_remove_client_dir(struct rpc_clnt *);
99
100extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
101extern void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
102		const struct rpc_pipe_dir_object_ops *pdo_ops,
103		void *pdo_data);
104extern int rpc_add_pipe_dir_object(struct net *net,
105		struct rpc_pipe_dir_head *pdh,
106		struct rpc_pipe_dir_object *pdo);
107extern void rpc_remove_pipe_dir_object(struct net *net,
108		struct rpc_pipe_dir_head *pdh,
109		struct rpc_pipe_dir_object *pdo);
110extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
111		struct net *net,
112		struct rpc_pipe_dir_head *pdh,
113		int (*match)(struct rpc_pipe_dir_object *, void *),
114		struct rpc_pipe_dir_object *(*alloc)(void *),
115		void *data);
116
117struct cache_detail;
118extern struct dentry *rpc_create_cache_dir(struct dentry *,
119					   const char *,
120					   umode_t umode,
121					   struct cache_detail *);
122extern void rpc_remove_cache_dir(struct dentry *);
123
124extern int rpc_rmdir(struct dentry *dentry);
125
126struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
127void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
128extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
129					struct rpc_pipe *);
130extern int rpc_unlink(struct dentry *);
131extern int register_rpc_pipefs(void);
132extern void unregister_rpc_pipefs(void);
133
134extern bool gssd_running(struct net *net);
135
136#endif
137#endif
138