1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SUNRPC_RPC_PIPE_FS_H
3 #define _LINUX_SUNRPC_RPC_PIPE_FS_H
4
5 #include <linux/workqueue.h>
6
7 struct rpc_pipe_dir_head {
8 struct list_head pdh_entries;
9 struct dentry *pdh_dentry;
10 };
11
12 struct rpc_pipe_dir_object_ops;
13 struct rpc_pipe_dir_object {
14 struct list_head pdo_head;
15 const struct rpc_pipe_dir_object_ops *pdo_ops;
16
17 void *pdo_data;
18 };
19
20 struct rpc_pipe_dir_object_ops {
21 int (*create)(struct dentry *dir,
22 struct rpc_pipe_dir_object *pdo);
23 void (*destroy)(struct dentry *dir,
24 struct rpc_pipe_dir_object *pdo);
25 };
26
27 struct rpc_pipe_msg {
28 struct list_head list;
29 void *data;
30 size_t len;
31 size_t copied;
32 int errno;
33 };
34
35 struct rpc_pipe_ops {
36 ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
37 ssize_t (*downcall)(struct file *, const char __user *, size_t);
38 void (*release_pipe)(struct inode *);
39 int (*open_pipe)(struct inode *);
40 void (*destroy_msg)(struct rpc_pipe_msg *);
41 };
42
43 struct rpc_pipe {
44 struct list_head pipe;
45 struct list_head in_upcall;
46 struct list_head in_downcall;
47 int pipelen;
48 int nreaders;
49 int nwriters;
50 #define RPC_PIPE_WAIT_FOR_OPEN 1
51 int flags;
52 struct delayed_work queue_timeout;
53 const struct rpc_pipe_ops *ops;
54 spinlock_t lock;
55 struct dentry *dentry;
56 };
57
58 struct rpc_inode {
59 struct inode vfs_inode;
60 void *private;
61 struct rpc_pipe *pipe;
62 wait_queue_head_t waitq;
63 };
64
65 static inline struct rpc_inode *
66 RPC_I(struct inode *inode)
67 {
68 return container_of(inode, struct rpc_inode, vfs_inode);
69 }
70
71 enum {
72 SUNRPC_PIPEFS_NFS_PRIO,
73 SUNRPC_PIPEFS_RPC_PRIO,
74 };
75
76 extern int rpc_pipefs_notifier_register(struct notifier_block *);
77 extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
78
79 enum {
80 RPC_PIPEFS_MOUNT,
81 RPC_PIPEFS_UMOUNT,
82 };
83
84 extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
85 const unsigned char *dir_name);
86 extern int rpc_pipefs_init_net(struct net *net);
87 extern void rpc_pipefs_exit_net(struct net *net);
88 extern struct super_block *rpc_get_sb_net(const struct net *net);
89 extern void rpc_put_sb_net(const struct net *net);
90
91 extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
92 char __user *, size_t);
93 extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
94
95 /* returns true if the msg is in-flight, i.e., already eaten by the peer */
96 static inline bool rpc_msg_is_inflight(const struct rpc_pipe_msg *msg) {
97 return (msg->copied != 0 && list_empty(&msg->list));
98 }
99
100 struct rpc_clnt;
101 extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
102 extern int rpc_remove_client_dir(struct rpc_clnt *);
103
104 extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
105 extern void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
106 const struct rpc_pipe_dir_object_ops *pdo_ops,
107 void *pdo_data);
108 extern int rpc_add_pipe_dir_object(struct net *net,
109 struct rpc_pipe_dir_head *pdh,
110 struct rpc_pipe_dir_object *pdo);
111 extern void rpc_remove_pipe_dir_object(struct net *net,
112 struct rpc_pipe_dir_head *pdh,
113 struct rpc_pipe_dir_object *pdo);
114 extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
115 struct net *net,
116 struct rpc_pipe_dir_head *pdh,
117 int (*match)(struct rpc_pipe_dir_object *, void *),
118 struct rpc_pipe_dir_object *(*alloc)(void *),
119 void *data);
120
121 struct cache_detail;
122 extern struct dentry *rpc_create_cache_dir(struct dentry *,
123 const char *,
124 umode_t umode,
125 struct cache_detail *);
126 extern void rpc_remove_cache_dir(struct dentry *);
127
128 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
129 void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
130 extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
131 struct rpc_pipe *);
132 extern int rpc_unlink(struct dentry *);
133 extern int register_rpc_pipefs(void);
134 extern void unregister_rpc_pipefs(void);
135
136 extern bool gssd_running(struct net *net);
137
138 #endif
139
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