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 init_rwsem(&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->cells_alias_lock);
86 mutex_init(&net->proc_cells_lock);
87 INIT_HLIST_HEAD(&net->proc_cells);
88
89 seqlock_init(&net->fs_lock);
90 net->fs_servers = RB_ROOT;
91 INIT_LIST_HEAD(&net->fs_probe_fast);
92 INIT_LIST_HEAD(&net->fs_probe_slow);
93 INIT_HLIST_HEAD(&net->fs_proc);
94
95 INIT_HLIST_HEAD(&net->fs_addresses4);
96 INIT_HLIST_HEAD(&net->fs_addresses6);
97 seqlock_init(&net->fs_addr_lock);
98
99 INIT_WORK(&net->fs_manager, afs_manage_servers);
100 timer_setup(&net->fs_timer, afs_servers_timer, 0);
101 INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
102 timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
103 atomic_set(&net->servers_outstanding, 1);
104
105 ret = -ENOMEM;
106 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
107 if (!sysnames)
108 goto error_sysnames;
109 sysnames->subs[0] = (char *)&afs_init_sysname;
110 sysnames->nr = 1;
111 refcount_set(&sysnames->usage, 1);
112 net->sysnames = sysnames;
113 rwlock_init(&net->sysnames_lock);
114
115 /* Register the /proc stuff */
116 ret = afs_proc_init(net);
117 if (ret < 0)
118 goto error_proc;
119
120 /* Initialise the cell DB */
121 ret = afs_cell_init(net, rootcell);
122 if (ret < 0)
123 goto error_cell_init;
124
125 /* Create the RxRPC transport */
126 ret = afs_open_socket(net);
127 if (ret < 0)
128 goto error_open_socket;
129
130 return 0;
131
132 error_open_socket:
133 net->live = false;
134 afs_fs_probe_cleanup(net);
135 afs_cell_purge(net);
136 afs_purge_servers(net);
137 error_cell_init:
138 net->live = false;
139 afs_proc_cleanup(net);
140 error_proc:
141 afs_put_sysnames(net->sysnames);
142 error_sysnames:
143 net->live = false;
144 return ret;
145 }
146
147 /*
148 * Clean up and destroy an AFS network namespace record.
149 */
afs_net_exit(struct net * net_ns)150 static void __net_exit afs_net_exit(struct net *net_ns)
151 {
152 struct afs_net *net = afs_net(net_ns);
153
154 net->live = false;
155 afs_fs_probe_cleanup(net);
156 afs_cell_purge(net);
157 afs_purge_servers(net);
158 afs_close_socket(net);
159 afs_proc_cleanup(net);
160 afs_put_sysnames(net->sysnames);
161 }
162
163 static struct pernet_operations afs_net_ops = {
164 .init = afs_net_init,
165 .exit = afs_net_exit,
166 .id = &afs_net_id,
167 .size = sizeof(struct afs_net),
168 };
169
170 /*
171 * initialise the AFS client FS module
172 */
afs_init(void)173 static int __init afs_init(void)
174 {
175 int ret = -ENOMEM;
176
177 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
178
179 afs_wq = alloc_workqueue("afs", 0, 0);
180 if (!afs_wq)
181 goto error_afs_wq;
182 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
183 if (!afs_async_calls)
184 goto error_async;
185 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
186 if (!afs_lock_manager)
187 goto error_lockmgr;
188
189 #ifdef CONFIG_AFS_FSCACHE
190 /* we want to be able to cache */
191 ret = fscache_register_netfs(&afs_cache_netfs);
192 if (ret < 0)
193 goto error_cache;
194 #endif
195
196 ret = register_pernet_subsys(&afs_net_ops);
197 if (ret < 0)
198 goto error_net;
199
200 /* register the filesystems */
201 ret = afs_fs_init();
202 if (ret < 0)
203 goto error_fs;
204
205 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
206 if (IS_ERR(afs_proc_symlink)) {
207 ret = PTR_ERR(afs_proc_symlink);
208 goto error_proc;
209 }
210
211 return ret;
212
213 error_proc:
214 afs_fs_exit();
215 error_fs:
216 unregister_pernet_subsys(&afs_net_ops);
217 error_net:
218 #ifdef CONFIG_AFS_FSCACHE
219 fscache_unregister_netfs(&afs_cache_netfs);
220 error_cache:
221 #endif
222 destroy_workqueue(afs_lock_manager);
223 error_lockmgr:
224 destroy_workqueue(afs_async_calls);
225 error_async:
226 destroy_workqueue(afs_wq);
227 error_afs_wq:
228 rcu_barrier();
229 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
230 return ret;
231 }
232
233 /* XXX late_initcall is kludgy, but the only alternative seems to create
234 * a transport upon the first mount, which is worse. Or is it?
235 */
236 late_initcall(afs_init); /* must be called after net/ to create socket */
237
238 /*
239 * clean up on module removal
240 */
afs_exit(void)241 static void __exit afs_exit(void)
242 {
243 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
244
245 proc_remove(afs_proc_symlink);
246 afs_fs_exit();
247 unregister_pernet_subsys(&afs_net_ops);
248 #ifdef CONFIG_AFS_FSCACHE
249 fscache_unregister_netfs(&afs_cache_netfs);
250 #endif
251 destroy_workqueue(afs_lock_manager);
252 destroy_workqueue(afs_async_calls);
253 destroy_workqueue(afs_wq);
254 afs_clean_up_permit_cache();
255 rcu_barrier();
256 }
257
258 module_exit(afs_exit);
259
