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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SUNRPC_RPC_PIPE_FS_H
#define _LINUX_SUNRPC_RPC_PIPE_FS_H
#include <linux/workqueue.h>
struct rpc_pipe_dir_head {
struct list_head pdh_entries;
struct dentry *pdh_dentry;
};
struct rpc_pipe_dir_object_ops;
struct rpc_pipe_dir_object {
struct list_head pdo_head;
const struct rpc_pipe_dir_object_ops *pdo_ops;
void *pdo_data;
};
struct rpc_pipe_dir_object_ops {
int (*create)(struct dentry *dir,
struct rpc_pipe_dir_object *pdo);
void (*destroy)(struct dentry *dir,
struct rpc_pipe_dir_object *pdo);
};
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 int rpc_pipefs_init_net(struct net *net);
extern void rpc_pipefs_exit_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 *);
/* returns true if the msg is in-flight, i.e., already eaten by the peer */
static inline bool rpc_msg_is_inflight(const struct rpc_pipe_msg *msg) {
return (msg->copied != 0 && list_empty(&msg->list));
}
struct rpc_clnt;
extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
extern int rpc_remove_client_dir(struct rpc_clnt *);
extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
extern void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
const struct rpc_pipe_dir_object_ops *pdo_ops,
void *pdo_data);
extern int rpc_add_pipe_dir_object(struct net *net,
struct rpc_pipe_dir_head *pdh,
struct rpc_pipe_dir_object *pdo);
extern void rpc_remove_pipe_dir_object(struct net *net,
struct rpc_pipe_dir_head *pdh,
struct rpc_pipe_dir_object *pdo);
extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
struct net *net,
struct rpc_pipe_dir_head *pdh,
int (*match)(struct rpc_pipe_dir_object *, void *),
struct rpc_pipe_dir_object *(*alloc)(void *),
void *data);
struct cache_detail;
extern struct dentry *rpc_create_cache_dir(struct dentry *,
const char *,
umode_t umode,
struct cache_detail *);
extern void rpc_remove_cache_dir(struct 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);
extern bool gssd_running(struct net *net);
#endif
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