rpc_pipe_fs.h

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#ifndef _LINUX_SUNRPC_RPC_PIPE_FS_H
#define _LINUX_SUNRPC_RPC_PIPE_FS_H

#ifdef __KERNEL__

#include <linux/workqueue.h>

struct rpc_pipe_msg {
    struct list_head list;
    void *data;
    size_t len;
    size_t copied;
    int errno;
};

struct rpc_pipe_ops {
    ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
    ssize_t (*downcall)(struct file *, const char __user *, size_t);
    void (*release_pipe)(struct inode *);
    int (*open_pipe)(struct inode *);
    void (*destroy_msg)(struct rpc_pipe_msg *);
};

struct rpc_pipe {
    struct list_head pipe;
    struct list_head in_upcall;
    struct list_head in_downcall;
    int pipelen;
    int nreaders;
    int nwriters;
#define RPC_PIPE_WAIT_FOR_OPEN  1
    int flags;
    struct delayed_work queue_timeout;
    const struct rpc_pipe_ops *ops;
    spinlock_t lock;
    struct dentry *dentry;
};

struct rpc_inode {
    struct inode vfs_inode;
    void *private;
    struct rpc_pipe *pipe;
    wait_queue_head_t waitq;
};

static inline struct rpc_inode *
RPC_I(struct inode *inode)
{
    return container_of(inode, struct rpc_inode, vfs_inode);
}

enum {
    SUNRPC_PIPEFS_NFS_PRIO,
    SUNRPC_PIPEFS_RPC_PRIO,
};

extern int rpc_pipefs_notifier_register(struct notifier_block *);
extern void rpc_pipefs_notifier_unregister(struct notifier_block *);

enum {
    RPC_PIPEFS_MOUNT,
    RPC_PIPEFS_UMOUNT,
};

extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
                      const unsigned char *dir_name);
extern void rpc_pipefs_init_net(struct net *net);
extern struct super_block *rpc_get_sb_net(const struct net *net);
extern void rpc_put_sb_net(const struct net *net);

extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
                       char __user *, size_t);
extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);

struct rpc_clnt;
extern struct dentry *rpc_create_client_dir(struct dentry *, struct qstr *, struct rpc_clnt *);
extern int rpc_remove_client_dir(struct dentry *);

struct cache_detail;
extern struct dentry *rpc_create_cache_dir(struct dentry *,
                       struct qstr *,
                       umode_t umode,
                       struct cache_detail *);
extern void rpc_remove_cache_dir(struct dentry *);

extern int rpc_rmdir(struct dentry *dentry);

struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
                    struct rpc_pipe *);
extern int rpc_unlink(struct dentry *);
extern int register_rpc_pipefs(void);
extern void unregister_rpc_pipefs(void);

#endif
#endif