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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 <linux/random.h>
18#include <linux/proc_fs.h>
19#define CREATE_TRACE_POINTS
20#include "internal.h"
21
22MODULE_DESCRIPTION("AFS Client File System");
23MODULE_AUTHOR("Red Hat, Inc.");
24MODULE_LICENSE("GPL");
25
26unsigned afs_debug;
27module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
28MODULE_PARM_DESC(debug, "AFS debugging mask");
29
30static char *rootcell;
31
32module_param(rootcell, charp, 0);
33MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
34
35struct workqueue_struct *afs_wq;
36static struct proc_dir_entry *afs_proc_symlink;
37
38#if defined(CONFIG_ALPHA)
39const char afs_init_sysname[] = "alpha_linux26";
40#elif defined(CONFIG_X86_64)
41const char afs_init_sysname[] = "amd64_linux26";
42#elif defined(CONFIG_ARM)
43const char afs_init_sysname[] = "arm_linux26";
44#elif defined(CONFIG_ARM64)
45const char afs_init_sysname[] = "aarch64_linux26";
46#elif defined(CONFIG_X86_32)
47const char afs_init_sysname[] = "i386_linux26";
48#elif defined(CONFIG_IA64)
49const char afs_init_sysname[] = "ia64_linux26";
50#elif defined(CONFIG_PPC64)
51const char afs_init_sysname[] = "ppc64_linux26";
52#elif defined(CONFIG_PPC32)
53const char afs_init_sysname[] = "ppc_linux26";
54#elif defined(CONFIG_S390)
55#ifdef CONFIG_64BIT
56const char afs_init_sysname[] = "s390x_linux26";
57#else
58const char afs_init_sysname[] = "s390_linux26";
59#endif
60#elif defined(CONFIG_SPARC64)
61const char afs_init_sysname[] = "sparc64_linux26";
62#elif defined(CONFIG_SPARC32)
63const char afs_init_sysname[] = "sparc_linux26";
64#else
65const char afs_init_sysname[] = "unknown_linux26";
66#endif
67
68/*
69 * Initialise an AFS network namespace record.
70 */
71static int __net_init afs_net_init(struct net *net_ns)
72{
73 struct afs_sysnames *sysnames;
74 struct afs_net *net = afs_net(net_ns);
75 int ret;
76
77 net->net = net_ns;
78 net->live = true;
79 generate_random_uuid((unsigned char *)&net->uuid);
80
81 INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
82 mutex_init(&net->socket_mutex);
83
84 net->cells = RB_ROOT;
85 seqlock_init(&net->cells_lock);
86 INIT_WORK(&net->cells_manager, afs_manage_cells);
87 timer_setup(&net->cells_timer, afs_cells_timer, 0);
88
89 mutex_init(&net->proc_cells_lock);
90 INIT_HLIST_HEAD(&net->proc_cells);
91
92 seqlock_init(&net->fs_lock);
93 net->fs_servers = RB_ROOT;
94 INIT_LIST_HEAD(&net->fs_updates);
95 INIT_HLIST_HEAD(&net->fs_proc);
96
97 INIT_HLIST_HEAD(&net->fs_addresses4);
98 INIT_HLIST_HEAD(&net->fs_addresses6);
99 seqlock_init(&net->fs_addr_lock);
100
101 INIT_WORK(&net->fs_manager, afs_manage_servers);
102 timer_setup(&net->fs_timer, afs_servers_timer, 0);
103
104 ret = -ENOMEM;
105 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
106 if (!sysnames)
107 goto error_sysnames;
108 sysnames->subs[0] = (char *)&afs_init_sysname;
109 sysnames->nr = 1;
110 refcount_set(&sysnames->usage, 1);
111 net->sysnames = sysnames;
112 rwlock_init(&net->sysnames_lock);
113
114 /* Register the /proc stuff */
115 ret = afs_proc_init(net);
116 if (ret < 0)
117 goto error_proc;
118
119 /* Initialise the cell DB */
120 ret = afs_cell_init(net, rootcell);
121 if (ret < 0)
122 goto error_cell_init;
123
124 /* Create the RxRPC transport */
125 ret = afs_open_socket(net);
126 if (ret < 0)
127 goto error_open_socket;
128
129 return 0;
130
131error_open_socket:
132 net->live = false;
133 afs_cell_purge(net);
134 afs_purge_servers(net);
135error_cell_init:
136 net->live = false;
137 afs_proc_cleanup(net);
138error_proc:
139 afs_put_sysnames(net->sysnames);
140error_sysnames:
141 net->live = false;
142 return ret;
143}
144
145/*
146 * Clean up and destroy an AFS network namespace record.
147 */
148static void __net_exit afs_net_exit(struct net *net_ns)
149{
150 struct afs_net *net = afs_net(net_ns);
151
152 net->live = false;
153 afs_cell_purge(net);
154 afs_purge_servers(net);
155 afs_close_socket(net);
156 afs_proc_cleanup(net);
157 afs_put_sysnames(net->sysnames);
158}
159
160static struct pernet_operations afs_net_ops = {
161 .init = afs_net_init,
162 .exit = afs_net_exit,
163 .id = &afs_net_id,
164 .size = sizeof(struct afs_net),
165};
166
167/*
168 * initialise the AFS client FS module
169 */
170static int __init afs_init(void)
171{
172 int ret = -ENOMEM;
173
174 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
175
176 afs_wq = alloc_workqueue("afs", 0, 0);
177 if (!afs_wq)
178 goto error_afs_wq;
179 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
180 if (!afs_async_calls)
181 goto error_async;
182 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
183 if (!afs_lock_manager)
184 goto error_lockmgr;
185
186#ifdef CONFIG_AFS_FSCACHE
187 /* we want to be able to cache */
188 ret = fscache_register_netfs(&afs_cache_netfs);
189 if (ret < 0)
190 goto error_cache;
191#endif
192
193 ret = register_pernet_subsys(&afs_net_ops);
194 if (ret < 0)
195 goto error_net;
196
197 /* register the filesystems */
198 ret = afs_fs_init();
199 if (ret < 0)
200 goto error_fs;
201
202 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
203 if (IS_ERR(afs_proc_symlink)) {
204 ret = PTR_ERR(afs_proc_symlink);
205 goto error_proc;
206 }
207
208 return ret;
209
210error_proc:
211 afs_fs_exit();
212error_fs:
213 unregister_pernet_subsys(&afs_net_ops);
214error_net:
215#ifdef CONFIG_AFS_FSCACHE
216 fscache_unregister_netfs(&afs_cache_netfs);
217error_cache:
218#endif
219 destroy_workqueue(afs_lock_manager);
220error_lockmgr:
221 destroy_workqueue(afs_async_calls);
222error_async:
223 destroy_workqueue(afs_wq);
224error_afs_wq:
225 rcu_barrier();
226 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
227 return ret;
228}
229
230/* XXX late_initcall is kludgy, but the only alternative seems to create
231 * a transport upon the first mount, which is worse. Or is it?
232 */
233late_initcall(afs_init); /* must be called after net/ to create socket */
234
235/*
236 * clean up on module removal
237 */
238static void __exit afs_exit(void)
239{
240 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
241
242 proc_remove(afs_proc_symlink);
243 afs_fs_exit();
244 unregister_pernet_subsys(&afs_net_ops);
245#ifdef CONFIG_AFS_FSCACHE
246 fscache_unregister_netfs(&afs_cache_netfs);
247#endif
248 destroy_workqueue(afs_lock_manager);
249 destroy_workqueue(afs_async_calls);
250 destroy_workqueue(afs_wq);
251 afs_clean_up_permit_cache();
252 rcu_barrier();
253}
254
255module_exit(afs_exit);