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