1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* AFS client file system
3 *
4 * Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/module.h>
9 #include <linux/moduleparam.h>
10 #include <linux/init.h>
11 #include <linux/completion.h>
12 #include <linux/sched.h>
13 #include <linux/random.h>
14 #include <linux/proc_fs.h>
15 #define CREATE_TRACE_POINTS
16 #include "internal.h"
17
18 MODULE_DESCRIPTION("AFS Client File System");
19 MODULE_AUTHOR("Red Hat, Inc.");
20 MODULE_LICENSE("GPL");
21
22 unsigned afs_debug;
23 module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
24 MODULE_PARM_DESC(debug, "AFS debugging mask");
25
26 static char *rootcell;
27
28 module_param(rootcell, charp, 0);
29 MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
30
31 struct workqueue_struct *afs_wq;
32 static struct proc_dir_entry *afs_proc_symlink;
33
34 #if defined(CONFIG_ALPHA)
35 const char afs_init_sysname[] = "alpha_linux26";
36 #elif defined(CONFIG_X86_64)
37 const char afs_init_sysname[] = "amd64_linux26";
38 #elif defined(CONFIG_ARM)
39 const char afs_init_sysname[] = "arm_linux26";
40 #elif defined(CONFIG_ARM64)
41 const char afs_init_sysname[] = "aarch64_linux26";
42 #elif defined(CONFIG_X86_32)
43 const char afs_init_sysname[] = "i386_linux26";
44 #elif defined(CONFIG_IA64)
45 const char afs_init_sysname[] = "ia64_linux26";
46 #elif defined(CONFIG_PPC64)
47 const char afs_init_sysname[] = "ppc64_linux26";
48 #elif defined(CONFIG_PPC32)
49 const char afs_init_sysname[] = "ppc_linux26";
50 #elif defined(CONFIG_S390)
51 #ifdef CONFIG_64BIT
52 const char afs_init_sysname[] = "s390x_linux26";
53 #else
54 const char afs_init_sysname[] = "s390_linux26";
55 #endif
56 #elif defined(CONFIG_SPARC64)
57 const char afs_init_sysname[] = "sparc64_linux26";
58 #elif defined(CONFIG_SPARC32)
59 const char afs_init_sysname[] = "sparc_linux26";
60 #else
61 const char afs_init_sysname[] = "unknown_linux26";
62 #endif
63
64 /*
65 * Initialise an AFS network namespace record.
66 */
afs_net_init(struct net * net_ns)67 static int __net_init afs_net_init(struct net *net_ns)
68 {
69 struct afs_sysnames *sysnames;
70 struct afs_net *net = afs_net(net_ns);
71 int ret;
72
73 net->net = net_ns;
74 net->live = true;
75 generate_random_uuid((unsigned char *)&net->uuid);
76
77 INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
78 mutex_init(&net->socket_mutex);
79
80 net->cells = RB_ROOT;
81 seqlock_init(&net->cells_lock);
82 INIT_WORK(&net->cells_manager, afs_manage_cells);
83 timer_setup(&net->cells_timer, afs_cells_timer, 0);
84
85 mutex_init(&net->proc_cells_lock);
86 INIT_HLIST_HEAD(&net->proc_cells);
87
88 seqlock_init(&net->fs_lock);
89 net->fs_servers = RB_ROOT;
90 INIT_LIST_HEAD(&net->fs_updates);
91 INIT_HLIST_HEAD(&net->fs_proc);
92
93 INIT_HLIST_HEAD(&net->fs_addresses4);
94 INIT_HLIST_HEAD(&net->fs_addresses6);
95 seqlock_init(&net->fs_addr_lock);
96
97 INIT_WORK(&net->fs_manager, afs_manage_servers);
98 timer_setup(&net->fs_timer, afs_servers_timer, 0);
99
100 ret = -ENOMEM;
101 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
102 if (!sysnames)
103 goto error_sysnames;
104 sysnames->subs[0] = (char *)&afs_init_sysname;
105 sysnames->nr = 1;
106 refcount_set(&sysnames->usage, 1);
107 net->sysnames = sysnames;
108 rwlock_init(&net->sysnames_lock);
109
110 /* Register the /proc stuff */
111 ret = afs_proc_init(net);
112 if (ret < 0)
113 goto error_proc;
114
115 /* Initialise the cell DB */
116 ret = afs_cell_init(net, rootcell);
117 if (ret < 0)
118 goto error_cell_init;
119
120 /* Create the RxRPC transport */
121 ret = afs_open_socket(net);
122 if (ret < 0)
123 goto error_open_socket;
124
125 return 0;
126
127 error_open_socket:
128 net->live = false;
129 afs_cell_purge(net);
130 afs_purge_servers(net);
131 error_cell_init:
132 net->live = false;
133 afs_proc_cleanup(net);
134 error_proc:
135 afs_put_sysnames(net->sysnames);
136 error_sysnames:
137 net->live = false;
138 return ret;
139 }
140
141 /*
142 * Clean up and destroy an AFS network namespace record.
143 */
afs_net_exit(struct net * net_ns)144 static void __net_exit afs_net_exit(struct net *net_ns)
145 {
146 struct afs_net *net = afs_net(net_ns);
147
148 net->live = false;
149 afs_cell_purge(net);
150 afs_purge_servers(net);
151 afs_close_socket(net);
152 afs_proc_cleanup(net);
153 afs_put_sysnames(net->sysnames);
154 }
155
156 static struct pernet_operations afs_net_ops = {
157 .init = afs_net_init,
158 .exit = afs_net_exit,
159 .id = &afs_net_id,
160 .size = sizeof(struct afs_net),
161 };
162
163 /*
164 * initialise the AFS client FS module
165 */
afs_init(void)166 static int __init afs_init(void)
167 {
168 int ret = -ENOMEM;
169
170 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
171
172 afs_wq = alloc_workqueue("afs", 0, 0);
173 if (!afs_wq)
174 goto error_afs_wq;
175 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
176 if (!afs_async_calls)
177 goto error_async;
178 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
179 if (!afs_lock_manager)
180 goto error_lockmgr;
181
182 #ifdef CONFIG_AFS_FSCACHE
183 /* we want to be able to cache */
184 ret = fscache_register_netfs(&afs_cache_netfs);
185 if (ret < 0)
186 goto error_cache;
187 #endif
188
189 ret = register_pernet_subsys(&afs_net_ops);
190 if (ret < 0)
191 goto error_net;
192
193 /* register the filesystems */
194 ret = afs_fs_init();
195 if (ret < 0)
196 goto error_fs;
197
198 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
199 if (IS_ERR(afs_proc_symlink)) {
200 ret = PTR_ERR(afs_proc_symlink);
201 goto error_proc;
202 }
203
204 return ret;
205
206 error_proc:
207 afs_fs_exit();
208 error_fs:
209 unregister_pernet_subsys(&afs_net_ops);
210 error_net:
211 #ifdef CONFIG_AFS_FSCACHE
212 fscache_unregister_netfs(&afs_cache_netfs);
213 error_cache:
214 #endif
215 destroy_workqueue(afs_lock_manager);
216 error_lockmgr:
217 destroy_workqueue(afs_async_calls);
218 error_async:
219 destroy_workqueue(afs_wq);
220 error_afs_wq:
221 rcu_barrier();
222 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
223 return ret;
224 }
225
226 /* XXX late_initcall is kludgy, but the only alternative seems to create
227 * a transport upon the first mount, which is worse. Or is it?
228 */
229 late_initcall(afs_init); /* must be called after net/ to create socket */
230
231 /*
232 * clean up on module removal
233 */
afs_exit(void)234 static void __exit afs_exit(void)
235 {
236 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
237
238 proc_remove(afs_proc_symlink);
239 afs_fs_exit();
240 unregister_pernet_subsys(&afs_net_ops);
241 #ifdef CONFIG_AFS_FSCACHE
242 fscache_unregister_netfs(&afs_cache_netfs);
243 #endif
244 destroy_workqueue(afs_lock_manager);
245 destroy_workqueue(afs_async_calls);
246 destroy_workqueue(afs_wq);
247 afs_clean_up_permit_cache();
248 rcu_barrier();
249 }
250
251 module_exit(afs_exit);
252
