ia64/linux-2.6.18-xen.hg

view fs/afs/server.h @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /* server.h: AFS server record
2 *
3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
12 #ifndef _LINUX_AFS_SERVER_H
13 #define _LINUX_AFS_SERVER_H
15 #include "types.h"
16 #include "kafstimod.h"
17 #include <rxrpc/peer.h>
18 #include <linux/rwsem.h>
20 extern spinlock_t afs_server_peer_lock;
22 /*****************************************************************************/
23 /*
24 * AFS server record
25 */
26 struct afs_server
27 {
28 atomic_t usage;
29 struct afs_cell *cell; /* cell in which server resides */
30 struct list_head link; /* link in cell's server list */
31 struct rw_semaphore sem; /* access lock */
32 struct afs_timer timeout; /* graveyard timeout */
33 struct in_addr addr; /* server address */
34 struct rxrpc_peer *peer; /* peer record for this server */
35 struct rxrpc_connection *vlserver; /* connection to the volume location service */
37 /* file service access */
38 #define AFS_SERVER_CONN_LIST_SIZE 2
39 struct rxrpc_connection *fs_conn[AFS_SERVER_CONN_LIST_SIZE]; /* FS connections */
40 unsigned fs_conn_cnt[AFS_SERVER_CONN_LIST_SIZE]; /* per conn call count */
41 struct list_head fs_callq; /* queue of processes waiting to make a call */
42 spinlock_t fs_lock; /* access lock */
43 int fs_state; /* 0 or reason FS currently marked dead (-errno) */
44 unsigned fs_rtt; /* FS round trip time */
45 unsigned long fs_act_jif; /* time at which last activity occurred */
46 unsigned long fs_dead_jif; /* time at which no longer to be considered dead */
48 /* callback promise management */
49 struct list_head cb_promises; /* as yet unbroken promises from this server */
50 spinlock_t cb_lock; /* access lock */
51 };
53 extern int afs_server_lookup(struct afs_cell *cell,
54 const struct in_addr *addr,
55 struct afs_server **_server);
57 #define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
59 extern void afs_put_server(struct afs_server *server);
60 extern void afs_server_do_timeout(struct afs_server *server);
62 extern int afs_server_find_by_peer(const struct rxrpc_peer *peer,
63 struct afs_server **_server);
65 extern int afs_server_get_vlconn(struct afs_server *server,
66 struct rxrpc_connection **_conn);
68 static inline
69 struct afs_server *afs_server_get_from_peer(struct rxrpc_peer *peer)
70 {
71 struct afs_server *server;
73 spin_lock(&afs_server_peer_lock);
74 server = peer->user;
75 if (server)
76 afs_get_server(server);
77 spin_unlock(&afs_server_peer_lock);
79 return server;
80 }
82 /*****************************************************************************/
83 /*
84 * AFS server callslot grant record
85 */
86 struct afs_server_callslot
87 {
88 struct list_head link; /* link in server's list */
89 struct task_struct *task; /* process waiting to make call */
90 struct rxrpc_connection *conn; /* connection to use (or NULL on error) */
91 short nconn; /* connection slot number (-1 on error) */
92 char ready; /* T when ready */
93 int errno; /* error number if nconn==-1 */
94 };
96 extern int afs_server_request_callslot(struct afs_server *server,
97 struct afs_server_callslot *callslot);
99 extern void afs_server_release_callslot(struct afs_server *server,
100 struct afs_server_callslot *callslot);
102 #endif /* _LINUX_AFS_SERVER_H */