1 /* AFS client file system
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>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include "internal.h"
18
19 MODULE_DESCRIPTION("AFS Client File System");
20 MODULE_AUTHOR("Red Hat, Inc.");
21 MODULE_LICENSE("GPL");
22
23 unsigned afs_debug;
24 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
25 MODULE_PARM_DESC(debug, "AFS debugging mask");
26
27 static char *rootcell;
28
29 module_param(rootcell, charp, 0);
30 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
31
32 #ifdef AFS_CACHING_SUPPORT
33 static struct cachefs_netfs_operations afs_cache_ops = {
34 .get_page_cookie = afs_cache_get_page_cookie,
35 };
36
37 struct cachefs_netfs afs_cache_netfs = {
38 .name = "afs",
39 .version = 0,
40 .ops = &afs_cache_ops,
41 };
42 #endif
43
44 struct afs_uuid afs_uuid;
45
46 /*
47 * get a client UUID
48 */
49 static int __init afs_get_client_UUID(void)
50 {
51 struct timespec ts;
52 u64 uuidtime;
53 u16 clockseq;
54 int ret;
55
56 /* read the MAC address of one of the external interfaces and construct
57 * a UUID from it */
58 ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
59 if (ret < 0)
60 return ret;
61
62 getnstimeofday(&ts);
63 uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
64 uuidtime += ts.tv_nsec / 100;
65 uuidtime += AFS_UUID_TO_UNIX_TIME;
66 afs_uuid.time_low = uuidtime;
67 afs_uuid.time_mid = uuidtime >> 32;
68 afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
69 afs_uuid.time_hi_and_version = AFS_UUID_VERSION_TIME;
70
71 get_random_bytes(&clockseq, 2);
72 afs_uuid.clock_seq_low = clockseq;
73 afs_uuid.clock_seq_hi_and_reserved =
74 (clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
75 afs_uuid.clock_seq_hi_and_reserved = AFS_UUID_VARIANT_STD;
76
77 _debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
78 afs_uuid.time_low,
79 afs_uuid.time_mid,
80 afs_uuid.time_hi_and_version,
81 afs_uuid.clock_seq_hi_and_reserved,
82 afs_uuid.clock_seq_low,
83 afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
84 afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
85
86 return 0;
87 }
88
89 /*
90 * initialise the AFS client FS module
91 */
92 static int __init afs_init(void)
93 {
94 int ret;
95
96 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
97
98 ret = afs_get_client_UUID();
99 if (ret < 0)
100 return ret;
101
102 /* register the /proc stuff */
103 ret = afs_proc_init();
104 if (ret < 0)
105 return ret;
106
107 #ifdef AFS_CACHING_SUPPORT
108 /* we want to be able to cache */
109 ret = cachefs_register_netfs(&afs_cache_netfs,
110 &afs_cache_cell_index_def);
111 if (ret < 0)
112 goto error_cache;
113 #endif
114
115 /* initialise the cell DB */
116 ret = afs_cell_init(rootcell);
117 if (ret < 0)
118 goto error_cell_init;
119
120 /* initialise the VL update process */
121 ret = afs_vlocation_update_init();
122 if (ret < 0)
123 goto error_vl_update_init;
124
125 /* initialise the callback update process */
126 ret = afs_callback_update_init();
127
128 /* create the RxRPC transport */
129 ret = afs_open_socket();
130 if (ret < 0)
131 goto error_open_socket;
132
133 /* register the filesystems */
134 ret = afs_fs_init();
135 if (ret < 0)
136 goto error_fs;
137
138 return ret;
139
140 error_fs:
141 afs_close_socket();
142 error_open_socket:
143 error_vl_update_init:
144 error_cell_init:
145 #ifdef AFS_CACHING_SUPPORT
146 cachefs_unregister_netfs(&afs_cache_netfs);
147 error_cache:
148 #endif
149 afs_callback_update_kill();
150 afs_vlocation_purge();
151 afs_cell_purge();
152 afs_proc_cleanup();
153 rcu_barrier();
154 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
155 return ret;
156 }
157
158 /* XXX late_initcall is kludgy, but the only alternative seems to create
159 * a transport upon the first mount, which is worse. Or is it?
160 */
161 late_initcall(afs_init); /* must be called after net/ to create socket */
162
163 /*
164 * clean up on module removal
165 */
166 static void __exit afs_exit(void)
167 {
168 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
169
170 afs_fs_exit();
171 afs_kill_lock_manager();
172 afs_close_socket();
173 afs_purge_servers();
174 afs_callback_update_kill();
175 afs_vlocation_purge();
176 flush_scheduled_work();
177 afs_cell_purge();
178 #ifdef AFS_CACHING_SUPPORT
179 cachefs_unregister_netfs(&afs_cache_netfs);
180 #endif
181 afs_proc_cleanup();
182 rcu_barrier();
183 }
184
185 module_exit(afs_exit);
186
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