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Linux/include/linux/sunrpc/rpc_pipe_fs.h

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  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_dir_head {
  9         struct list_head pdh_entries;
 10         struct dentry *pdh_dentry;
 11 };
 12 
 13 struct rpc_pipe_dir_object_ops;
 14 struct 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 
 21 struct 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 
 28 struct rpc_pipe_msg {
 29         struct list_head list;
 30         void *data;
 31         size_t len;
 32         size_t copied;
 33         int errno;
 34 };
 35 
 36 struct 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 
 44 struct 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 
 59 struct rpc_inode {
 60         struct inode vfs_inode;
 61         void *private;
 62         struct rpc_pipe *pipe;
 63         wait_queue_head_t waitq;
 64 };
 65 
 66 static inline struct rpc_inode *
 67 RPC_I(struct inode *inode)
 68 {
 69         return container_of(inode, struct rpc_inode, vfs_inode);
 70 }
 71 
 72 enum {
 73         SUNRPC_PIPEFS_NFS_PRIO,
 74         SUNRPC_PIPEFS_RPC_PRIO,
 75 };
 76 
 77 extern int rpc_pipefs_notifier_register(struct notifier_block *);
 78 extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
 79 
 80 enum {
 81         RPC_PIPEFS_MOUNT,
 82         RPC_PIPEFS_UMOUNT,
 83 };
 84 
 85 extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
 86                                       const unsigned char *dir_name);
 87 extern int rpc_pipefs_init_net(struct net *net);
 88 extern void rpc_pipefs_exit_net(struct net *net);
 89 extern struct super_block *rpc_get_sb_net(const struct net *net);
 90 extern void rpc_put_sb_net(const struct net *net);
 91 
 92 extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
 93                                        char __user *, size_t);
 94 extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
 95 
 96 struct rpc_clnt;
 97 extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
 98 extern int rpc_remove_client_dir(struct rpc_clnt *);
 99 
100 extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
101 extern 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);
104 extern int rpc_add_pipe_dir_object(struct net *net,
105                 struct rpc_pipe_dir_head *pdh,
106                 struct rpc_pipe_dir_object *pdo);
107 extern void rpc_remove_pipe_dir_object(struct net *net,
108                 struct rpc_pipe_dir_head *pdh,
109                 struct rpc_pipe_dir_object *pdo);
110 extern 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 
117 struct cache_detail;
118 extern struct dentry *rpc_create_cache_dir(struct dentry *,
119                                            const char *,
120                                            umode_t umode,
121                                            struct cache_detail *);
122 extern void rpc_remove_cache_dir(struct dentry *);
123 
124 extern int rpc_rmdir(struct dentry *dentry);
125 
126 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
127 void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
128 extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
129                                         struct rpc_pipe *);
130 extern int rpc_unlink(struct dentry *);
131 extern int register_rpc_pipefs(void);
132 extern void unregister_rpc_pipefs(void);
133 
134 extern bool gssd_running(struct net *net);
135 
136 #endif
137 #endif
138 

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