include/linux/sunrpc/rpc_pipe_fs.h

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