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 #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_inode {
  25         struct inode vfs_inode;
  26         void *private;
  27         struct list_head pipe;
  28         struct list_head in_upcall;
  29         struct list_head in_downcall;
  30         int pipelen;
  31         int nreaders;
  32         int nwriters;
  33         int nkern_readwriters;
  34         wait_queue_head_t waitq;
  35 #define RPC_PIPE_WAIT_FOR_OPEN  1
  36         int flags;
  37         struct delayed_work queue_timeout;
  38         const struct rpc_pipe_ops *ops;
  39 };
  40
  41 static inline struct rpc_inode *
  42 RPC_I(struct inode *inode)
  43 {
  44         return container_of(inode, struct rpc_inode, vfs_inode);
  45 }
  46
  47 extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);
  48
  49 struct rpc_clnt;
  50 extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
  51 extern int rpc_remove_client_dir(struct dentry *);
  52
  53 struct cache_detail;
  54 extern struct dentry *rpc_create_cache_dir(struct dentry *,
  55                                            struct qstr *,
  56                                            mode_t umode,
  57                                            struct cache_detail *);
  58 extern void rpc_remove_cache_dir(struct dentry *);
  59
  60 extern struct dentry *rpc_mkpipe(struct dentry *, const char *, void *,
  61                                  const struct rpc_pipe_ops *, int flags);
  62 extern int rpc_unlink(struct dentry *);
  63 extern struct vfsmount *rpc_get_mount(void);
  64 extern void rpc_put_mount(void);
  65 extern int register_rpc_pipefs(void);
  66 extern void unregister_rpc_pipefs(void);
  67
  68 #endif
  69 #endif