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1da177e4 LT |
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 | */ | |
11 | ||
12 | #ifndef _LINUX_AFS_SERVER_H | |
13 | #define _LINUX_AFS_SERVER_H | |
14 | ||
15 | #include "types.h" | |
16 | #include "kafstimod.h" | |
17 | #include <rxrpc/peer.h> | |
18 | #include <linux/rwsem.h> | |
19 | ||
20 | extern spinlock_t afs_server_peer_lock; | |
21 | ||
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 */ | |
36 | ||
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 */ | |
47 | ||
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 | }; | |
52 | ||
53 | extern int afs_server_lookup(struct afs_cell *cell, | |
54 | const struct in_addr *addr, | |
55 | struct afs_server **_server); | |
56 | ||
57 | #define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0) | |
58 | ||
59 | extern void afs_put_server(struct afs_server *server); | |
60 | extern void afs_server_do_timeout(struct afs_server *server); | |
61 | ||
62 | extern int afs_server_find_by_peer(const struct rxrpc_peer *peer, | |
63 | struct afs_server **_server); | |
64 | ||
65 | extern int afs_server_get_vlconn(struct afs_server *server, | |
66 | struct rxrpc_connection **_conn); | |
67 | ||
68 | static inline | |
69 | struct afs_server *afs_server_get_from_peer(struct rxrpc_peer *peer) | |
70 | { | |
71 | struct afs_server *server; | |
72 | ||
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); | |
78 | ||
79 | return server; | |
80 | } | |
81 | ||
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 | }; | |
95 | ||
96 | extern int afs_server_request_callslot(struct afs_server *server, | |
97 | struct afs_server_callslot *callslot); | |
98 | ||
99 | extern void afs_server_release_callslot(struct afs_server *server, | |
100 | struct afs_server_callslot *callslot); | |
101 | ||
102 | #endif /* _LINUX_AFS_SERVER_H */ |