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ec26815a | 1 | /* AFS client file system |
1da177e4 LT |
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 | #include <linux/module.h> | |
13 | #include <linux/moduleparam.h> | |
14 | #include <linux/init.h> | |
1da177e4 LT |
15 | #include <linux/completion.h> |
16 | #include <rxrpc/rxrpc.h> | |
17 | #include <rxrpc/transport.h> | |
18 | #include <rxrpc/call.h> | |
19 | #include <rxrpc/peer.h> | |
20 | #include "cache.h" | |
21 | #include "cell.h" | |
22 | #include "server.h" | |
23 | #include "fsclient.h" | |
24 | #include "cmservice.h" | |
25 | #include "kafstimod.h" | |
26 | #include "kafsasyncd.h" | |
27 | #include "internal.h" | |
28 | ||
29 | struct rxrpc_transport *afs_transport; | |
30 | ||
31 | static int afs_adding_peer(struct rxrpc_peer *peer); | |
32 | static void afs_discarding_peer(struct rxrpc_peer *peer); | |
33 | ||
34 | ||
35 | MODULE_DESCRIPTION("AFS Client File System"); | |
36 | MODULE_AUTHOR("Red Hat, Inc."); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | static char *rootcell; | |
40 | ||
41 | module_param(rootcell, charp, 0); | |
42 | MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list"); | |
43 | ||
44 | ||
45 | static struct rxrpc_peer_ops afs_peer_ops = { | |
46 | .adding = afs_adding_peer, | |
47 | .discarding = afs_discarding_peer, | |
48 | }; | |
49 | ||
50 | struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT]; | |
51 | DEFINE_SPINLOCK(afs_cb_hash_lock); | |
52 | ||
53 | #ifdef AFS_CACHING_SUPPORT | |
54 | static struct cachefs_netfs_operations afs_cache_ops = { | |
55 | .get_page_cookie = afs_cache_get_page_cookie, | |
56 | }; | |
57 | ||
58 | struct cachefs_netfs afs_cache_netfs = { | |
59 | .name = "afs", | |
60 | .version = 0, | |
61 | .ops = &afs_cache_ops, | |
62 | }; | |
63 | #endif | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * initialise the AFS client FS module | |
67 | */ | |
68 | static int __init afs_init(void) | |
69 | { | |
70 | int loop, ret; | |
71 | ||
72 | printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n"); | |
73 | ||
74 | /* initialise the callback hash table */ | |
75 | spin_lock_init(&afs_cb_hash_lock); | |
76 | for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--) | |
77 | INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]); | |
78 | ||
79 | /* register the /proc stuff */ | |
80 | ret = afs_proc_init(); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | ||
84 | #ifdef AFS_CACHING_SUPPORT | |
85 | /* we want to be able to cache */ | |
86 | ret = cachefs_register_netfs(&afs_cache_netfs, | |
87 | &afs_cache_cell_index_def); | |
1da177e4 LT |
88 | if (ret < 0) |
89 | goto error_cache; | |
90 | #endif | |
91 | ||
92 | /* initialise the cell DB */ | |
93 | ret = afs_cell_init(rootcell); | |
94 | if (ret < 0) | |
ec26815a | 95 | goto error_cell_init; |
1da177e4 LT |
96 | |
97 | /* start the timeout daemon */ | |
98 | ret = afs_kafstimod_start(); | |
99 | if (ret < 0) | |
ec26815a | 100 | goto error_kafstimod; |
1da177e4 LT |
101 | |
102 | /* start the async operation daemon */ | |
103 | ret = afs_kafsasyncd_start(); | |
104 | if (ret < 0) | |
ec26815a | 105 | goto error_kafsasyncd; |
1da177e4 LT |
106 | |
107 | /* create the RxRPC transport */ | |
108 | ret = rxrpc_create_transport(7001, &afs_transport); | |
109 | if (ret < 0) | |
ec26815a | 110 | goto error_transport; |
1da177e4 LT |
111 | |
112 | afs_transport->peer_ops = &afs_peer_ops; | |
113 | ||
114 | /* register the filesystems */ | |
115 | ret = afs_fs_init(); | |
116 | if (ret < 0) | |
ec26815a | 117 | goto error_fs; |
1da177e4 LT |
118 | |
119 | return ret; | |
120 | ||
ec26815a | 121 | error_fs: |
1da177e4 | 122 | rxrpc_put_transport(afs_transport); |
ec26815a | 123 | error_transport: |
1da177e4 | 124 | afs_kafsasyncd_stop(); |
ec26815a | 125 | error_kafsasyncd: |
1da177e4 | 126 | afs_kafstimod_stop(); |
ec26815a DH |
127 | error_kafstimod: |
128 | error_cell_init: | |
1da177e4 LT |
129 | #ifdef AFS_CACHING_SUPPORT |
130 | cachefs_unregister_netfs(&afs_cache_netfs); | |
ec26815a | 131 | error_cache: |
1da177e4 LT |
132 | #endif |
133 | afs_cell_purge(); | |
134 | afs_proc_cleanup(); | |
135 | printk(KERN_ERR "kAFS: failed to register: %d\n", ret); | |
136 | return ret; | |
ec26815a | 137 | } |
1da177e4 LT |
138 | |
139 | /* XXX late_initcall is kludgy, but the only alternative seems to create | |
140 | * a transport upon the first mount, which is worse. Or is it? | |
141 | */ | |
142 | late_initcall(afs_init); /* must be called after net/ to create socket */ | |
ec26815a | 143 | |
1da177e4 LT |
144 | /* |
145 | * clean up on module removal | |
146 | */ | |
147 | static void __exit afs_exit(void) | |
148 | { | |
149 | printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n"); | |
150 | ||
151 | afs_fs_exit(); | |
152 | rxrpc_put_transport(afs_transport); | |
153 | afs_kafstimod_stop(); | |
154 | afs_kafsasyncd_stop(); | |
155 | afs_cell_purge(); | |
1da177e4 LT |
156 | #ifdef AFS_CACHING_SUPPORT |
157 | cachefs_unregister_netfs(&afs_cache_netfs); | |
158 | #endif | |
159 | afs_proc_cleanup(); | |
ec26815a | 160 | } |
1da177e4 LT |
161 | |
162 | module_exit(afs_exit); | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * notification that new peer record is being added | |
166 | * - called from krxsecd | |
167 | * - return an error to induce an abort | |
168 | * - mustn't sleep (caller holds an rwlock) | |
169 | */ | |
170 | static int afs_adding_peer(struct rxrpc_peer *peer) | |
171 | { | |
172 | struct afs_server *server; | |
173 | int ret; | |
174 | ||
175 | _debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr)); | |
176 | ||
177 | /* determine which server the peer resides in (if any) */ | |
178 | ret = afs_server_find_by_peer(peer, &server); | |
179 | if (ret < 0) | |
180 | return ret; /* none that we recognise, so abort */ | |
181 | ||
182 | _debug("Server %p{u=%d}\n", server, atomic_read(&server->usage)); | |
183 | ||
184 | _debug("Cell %p{u=%d}\n", | |
185 | server->cell, atomic_read(&server->cell->usage)); | |
186 | ||
187 | /* cross-point the structs under a global lock */ | |
188 | spin_lock(&afs_server_peer_lock); | |
189 | peer->user = server; | |
190 | server->peer = peer; | |
191 | spin_unlock(&afs_server_peer_lock); | |
192 | ||
193 | afs_put_server(server); | |
194 | ||
195 | return 0; | |
ec26815a | 196 | } |
1da177e4 | 197 | |
1da177e4 LT |
198 | /* |
199 | * notification that a peer record is being discarded | |
200 | * - called from krxiod or krxsecd | |
201 | */ | |
202 | static void afs_discarding_peer(struct rxrpc_peer *peer) | |
203 | { | |
204 | struct afs_server *server; | |
205 | ||
206 | _enter("%p",peer); | |
207 | ||
208 | _debug("Discarding peer %08x (rtt=%lu.%lumS)\n", | |
209 | ntohl(peer->addr.s_addr), | |
210 | (long) (peer->rtt / 1000), | |
211 | (long) (peer->rtt % 1000)); | |
212 | ||
213 | /* uncross-point the structs under a global lock */ | |
214 | spin_lock(&afs_server_peer_lock); | |
215 | server = peer->user; | |
216 | if (server) { | |
217 | peer->user = NULL; | |
218 | server->peer = NULL; | |
219 | } | |
220 | spin_unlock(&afs_server_peer_lock); | |
221 | ||
222 | _leave(""); | |
1da177e4 | 223 | } |