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_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 void rpc_pipefs_init_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 struct rpc_clnt;
  96 extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
  97 extern int rpc_remove_client_dir(struct rpc_clnt *);
  98
  99 extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
 100 extern void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
 101                 const struct rpc_pipe_dir_object_ops *pdo_ops,
 102                 void *pdo_data);
 103 extern int rpc_add_pipe_dir_object(struct net *net,
 104                 struct rpc_pipe_dir_head *pdh,
 105                 struct rpc_pipe_dir_object *pdo);
 106 extern void rpc_remove_pipe_dir_object(struct net *net,
 107                 struct rpc_pipe_dir_head *pdh,
 108                 struct rpc_pipe_dir_object *pdo);
 109 extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
 110                 struct net *net,
 111                 struct rpc_pipe_dir_head *pdh,
 112                 int (*match)(struct rpc_pipe_dir_object *, void *),
 113                 struct rpc_pipe_dir_object *(*alloc)(void *),
 114                 void *data);
 115
 116 struct cache_detail;
 117 extern struct dentry *rpc_create_cache_dir(struct dentry *,
 118                                            const char *,
 119                                            umode_t umode,
 120                                            struct cache_detail *);
 121 extern void rpc_remove_cache_dir(struct dentry *);
 122
 123 extern int rpc_rmdir(struct dentry *dentry);
 124
 125 struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
 126 void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
 127 extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
 128                                         struct rpc_pipe *);
 129 extern int rpc_unlink(struct dentry *);
 130 extern int register_rpc_pipefs(void);
 131 extern void unregister_rpc_pipefs(void);
 132
 133 #endif
 134 #endif