1/* AFS client file system
2 *
3 * Copyright (C) 2002,5 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
19MODULE_DESCRIPTION("AFS Client File System");
20MODULE_AUTHOR("Red Hat, Inc.");
21MODULE_LICENSE("GPL");
22
23unsigned afs_debug;
24module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
25MODULE_PARM_DESC(debug, "AFS debugging mask");
26
27static char *rootcell;
28
29module_param(rootcell, charp, 0);
30MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
31
32struct afs_uuid afs_uuid;
33struct workqueue_struct *afs_wq;
34
35/*
36 * get a client UUID
37 */
38static int __init afs_get_client_UUID(void)
39{
40	struct timespec ts;
41	u64 uuidtime;
42	u16 clockseq;
43	int ret;
44
45	/* read the MAC address of one of the external interfaces and construct
46	 * a UUID from it */
47	ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
48	if (ret < 0)
49		return ret;
50
51	getnstimeofday(&ts);
52	uuidtime = (u64) ts.tv_sec * 1000 * 1000 * 10;
53	uuidtime += ts.tv_nsec / 100;
54	uuidtime += AFS_UUID_TO_UNIX_TIME;
55	afs_uuid.time_low = uuidtime;
56	afs_uuid.time_mid = uuidtime >> 32;
57	afs_uuid.time_hi_and_version = (uuidtime >> 48) & AFS_UUID_TIMEHI_MASK;
58	afs_uuid.time_hi_and_version |= AFS_UUID_VERSION_TIME;
59
60	get_random_bytes(&clockseq, 2);
61	afs_uuid.clock_seq_low = clockseq;
62	afs_uuid.clock_seq_hi_and_reserved =
63		(clockseq >> 8) & AFS_UUID_CLOCKHI_MASK;
64	afs_uuid.clock_seq_hi_and_reserved |= AFS_UUID_VARIANT_STD;
65
66	_debug("AFS UUID: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
67	       afs_uuid.time_low,
68	       afs_uuid.time_mid,
69	       afs_uuid.time_hi_and_version,
70	       afs_uuid.clock_seq_hi_and_reserved,
71	       afs_uuid.clock_seq_low,
72	       afs_uuid.node[0], afs_uuid.node[1], afs_uuid.node[2],
73	       afs_uuid.node[3], afs_uuid.node[4], afs_uuid.node[5]);
74
75	return 0;
76}
77
78/*
79 * initialise the AFS client FS module
80 */
81static int __init afs_init(void)
82{
83	int ret;
84
85	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
86
87	ret = afs_get_client_UUID();
88	if (ret < 0)
89		return ret;
90
91	/* create workqueue */
92	ret = -ENOMEM;
93	afs_wq = alloc_workqueue("afs", 0, 0);
94	if (!afs_wq)
95		return ret;
96
97	/* register the /proc stuff */
98	ret = afs_proc_init();
99	if (ret < 0)
100		goto error_proc;
101
102#ifdef CONFIG_AFS_FSCACHE
103	/* we want to be able to cache */
104	ret = fscache_register_netfs(&afs_cache_netfs);
105	if (ret < 0)
106		goto error_cache;
107#endif
108
109	/* initialise the cell DB */
110	ret = afs_cell_init(rootcell);
111	if (ret < 0)
112		goto error_cell_init;
113
114	/* initialise the VL update process */
115	ret = afs_vlocation_update_init();
116	if (ret < 0)
117		goto error_vl_update_init;
118
119	/* initialise the callback update process */
120	ret = afs_callback_update_init();
121	if (ret < 0)
122		goto error_callback_update_init;
123
124	/* create the RxRPC transport */
125	ret = afs_open_socket();
126	if (ret < 0)
127		goto error_open_socket;
128
129	/* register the filesystems */
130	ret = afs_fs_init();
131	if (ret < 0)
132		goto error_fs;
133
134	return ret;
135
136error_fs:
137	afs_close_socket();
138error_open_socket:
139	afs_callback_update_kill();
140error_callback_update_init:
141	afs_vlocation_purge();
142error_vl_update_init:
143	afs_cell_purge();
144error_cell_init:
145#ifdef CONFIG_AFS_FSCACHE
146	fscache_unregister_netfs(&afs_cache_netfs);
147error_cache:
148#endif
149	afs_proc_cleanup();
150error_proc:
151	destroy_workqueue(afs_wq);
152	rcu_barrier();
153	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
154	return ret;
155}
156
157/* XXX late_initcall is kludgy, but the only alternative seems to create
158 * a transport upon the first mount, which is worse. Or is it?
159 */
160late_initcall(afs_init);	/* must be called after net/ to create socket */
161
162/*
163 * clean up on module removal
164 */
165static void __exit afs_exit(void)
166{
167	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
168
169	afs_fs_exit();
170	afs_kill_lock_manager();
171	afs_close_socket();
172	afs_purge_servers();
173	afs_callback_update_kill();
174	afs_vlocation_purge();
175	destroy_workqueue(afs_wq);
176	afs_cell_purge();
177#ifdef CONFIG_AFS_FSCACHE
178	fscache_unregister_netfs(&afs_cache_netfs);
179#endif
180	afs_proc_cleanup();
181	rcu_barrier();
182}
183
184module_exit(afs_exit);
185