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/* server.h: AFS server record
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _LINUX_AFS_SERVER_H
#define _LINUX_AFS_SERVER_H
#include "types.h"
#include "kafstimod.h"
#include <rxrpc/peer.h>
#include <linux/rwsem.h>
extern spinlock_t afs_server_peer_lock;
/*****************************************************************************/
/*
* AFS server record
*/
struct afs_server
{
atomic_t usage;
struct afs_cell *cell; /* cell in which server resides */
struct list_head link; /* link in cell's server list */
struct rw_semaphore sem; /* access lock */
struct afs_timer timeout; /* graveyard timeout */
struct in_addr addr; /* server address */
struct rxrpc_peer *peer; /* peer record for this server */
struct rxrpc_connection *vlserver; /* connection to the volume location service */
/* file service access */
#define AFS_SERVER_CONN_LIST_SIZE 2
struct rxrpc_connection *fs_conn[AFS_SERVER_CONN_LIST_SIZE]; /* FS connections */
unsigned fs_conn_cnt[AFS_SERVER_CONN_LIST_SIZE]; /* per conn call count */
struct list_head fs_callq; /* queue of processes waiting to make a call */
spinlock_t fs_lock; /* access lock */
int fs_state; /* 0 or reason FS currently marked dead (-errno) */
unsigned fs_rtt; /* FS round trip time */
unsigned long fs_act_jif; /* time at which last activity occurred */
unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
/* callback promise management */
struct list_head cb_promises; /* as yet unbroken promises from this server */
spinlock_t cb_lock; /* access lock */
};
extern int afs_server_lookup(struct afs_cell *cell,
const struct in_addr *addr,
struct afs_server **_server);
#define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
extern void afs_put_server(struct afs_server *server);
extern void afs_server_do_timeout(struct afs_server *server);
extern int afs_server_find_by_peer(const struct rxrpc_peer *peer,
struct afs_server **_server);
extern int afs_server_get_vlconn(struct afs_server *server,
struct rxrpc_connection **_conn);
static inline
struct afs_server *afs_server_get_from_peer(struct rxrpc_peer *peer)
{
struct afs_server *server;
spin_lock(&afs_server_peer_lock);
server = peer->user;
if (server)
afs_get_server(server);
spin_unlock(&afs_server_peer_lock);
return server;
}
/*****************************************************************************/
/*
* AFS server callslot grant record
*/
struct afs_server_callslot
{
struct list_head link; /* link in server's list */
struct task_struct *task; /* process waiting to make call */
struct rxrpc_connection *conn; /* connection to use (or NULL on error) */
short nconn; /* connection slot number (-1 on error) */
char ready; /* T when ready */
int errno; /* error number if nconn==-1 */
};
extern int afs_server_request_callslot(struct afs_server *server,
struct afs_server_callslot *callslot);
extern void afs_server_release_callslot(struct afs_server *server,
struct afs_server_callslot *callslot);
#endif /* _LINUX_AFS_SERVER_H */
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