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_pipe {
  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 #define RPC_PIPE_WAIT_FOR_OPEN  1
  32         int flags;
  33         struct delayed_work queue_timeout;
  34         const struct rpc_pipe_ops *ops;
  35         spinlock_t lock;
  36         struct dentry *dentry;
  37 };
  38
  39 struct rpc_inode {
  40         struct inode vfs_inode;
  41         void *private;
  42         struct rpc_pipe *pipe;
  43         wait_queue_head_t waitq;
  44 };
  45
  46 static inline struct rpc_inode *
  47 RPC_I(struct inode *inode)
  48 {
  49         return container_of(inode, struct rpc_inode, vfs_inode);
  50 }
  51
  52 enum {
  53         SUNRPC_PIPEFS_NFS_PRIO,
  54         SUNRPC_PIPEFS_RPC_PRIO,
  55 };
  56
  57 extern int rpc_pipefs_notifier_register(struct notifier_block *);
  58 extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
  59
  60 enum {
  61         RPC_PIPEFS_MOUNT,
  62         RPC_PIPEFS_UMOUNT,
  63 };
  64
  65 extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
  66                                       const unsigned char *dir_name);
  67 extern void rpc_pipefs_init_net(struct net *net);
  68 extern struct super_block *rpc_get_sb_net(const struct net *net);
  69 extern void rpc_put_sb_net(const struct net *net);
  70
  71 extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
  72                                        char __user *, size_t);
  73 extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
  74
  75 struct rpc_clnt;
  76 extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
  77 extern int rpc_remove_client_dir(struct dentry *);
  78
  79 struct cache_detail;
  80 extern struct dentry *rpc_create_cache_dir(struct dentry *,
  81                                            struct qstr *,
  82                                            umode_t umode,
  83                                            struct cache_detail *);
  84 extern void rpc_remove_cache_dir(struct dentry *);
  85
  86 extern int rpc_rmdir(struct dentry *dentry);
  87
  88 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
  89 void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
  90 extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
  91                                         struct rpc_pipe *);
  92 extern int rpc_unlink(struct dentry *);
  93 extern int register_rpc_pipefs(void);
  94 extern void unregister_rpc_pipefs(void);
  95
  96 #endif
  97 #endif