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_PPC64)
45 const char afs_init_sysname[] = "ppc64_linux26";
46 #elif defined(CONFIG_PPC32)
47 const char afs_init_sysname[] = "ppc_linux26";
48 #elif defined(CONFIG_S390)
49 #ifdef CONFIG_64BIT
50 const char afs_init_sysname[] = "s390x_linux26";
51 #else
52 const char afs_init_sysname[] = "s390_linux26";
53 #endif
54 #elif defined(CONFIG_SPARC64)
55 const char afs_init_sysname[] = "sparc64_linux26";
56 #elif defined(CONFIG_SPARC32)
57 const char afs_init_sysname[] = "sparc_linux26";
58 #else
59 const char afs_init_sysname[] = "unknown_linux26";
60 #endif
61
62 /*
63 * Initialise an AFS network namespace record.
64 */
afs_net_init(struct net * net_ns)65 static int __net_init afs_net_init(struct net *net_ns)
66 {
67 struct afs_sysnames *sysnames;
68 struct afs_net *net = afs_net(net_ns);
69 int ret;
70
71 net->net = net_ns;
72 net->live = true;
73 generate_random_uuid((unsigned char *)&net->uuid);
74
75 INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
76 mutex_init(&net->socket_mutex);
77
78 net->cells = RB_ROOT;
79 init_rwsem(&net->cells_lock);
80 INIT_WORK(&net->cells_manager, afs_manage_cells);
81 timer_setup(&net->cells_timer, afs_cells_timer, 0);
82
83 mutex_init(&net->cells_alias_lock);
84 mutex_init(&net->proc_cells_lock);
85 INIT_HLIST_HEAD(&net->proc_cells);
86
87 seqlock_init(&net->fs_lock);
88 net->fs_servers = RB_ROOT;
89 INIT_LIST_HEAD(&net->fs_probe_fast);
90 INIT_LIST_HEAD(&net->fs_probe_slow);
91 INIT_HLIST_HEAD(&net->fs_proc);
92
93 INIT_HLIST_HEAD(&net->fs_addresses);
94 seqlock_init(&net->fs_addr_lock);
95
96 INIT_WORK(&net->fs_manager, afs_manage_servers);
97 timer_setup(&net->fs_timer, afs_servers_timer, 0);
98 INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
99 timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
100 atomic_set(&net->servers_outstanding, 1);
101
102 ret = -ENOMEM;
103 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
104 if (!sysnames)
105 goto error_sysnames;
106 sysnames->subs[0] = (char *)&afs_init_sysname;
107 sysnames->nr = 1;
108 refcount_set(&sysnames->usage, 1);
109 net->sysnames = sysnames;
110 rwlock_init(&net->sysnames_lock);
111
112 /* Register the /proc stuff */
113 ret = afs_proc_init(net);
114 if (ret < 0)
115 goto error_proc;
116
117 /* Initialise the cell DB */
118 ret = afs_cell_init(net, rootcell);
119 if (ret < 0)
120 goto error_cell_init;
121
122 /* Create the RxRPC transport */
123 ret = afs_open_socket(net);
124 if (ret < 0)
125 goto error_open_socket;
126
127 return 0;
128
129 error_open_socket:
130 net->live = false;
131 afs_fs_probe_cleanup(net);
132 afs_cell_purge(net);
133 afs_purge_servers(net);
134 error_cell_init:
135 net->live = false;
136 afs_proc_cleanup(net);
137 error_proc:
138 afs_put_sysnames(net->sysnames);
139 error_sysnames:
140 net->live = false;
141 return ret;
142 }
143
144 /*
145 * Clean up and destroy an AFS network namespace record.
146 */
afs_net_exit(struct net * net_ns)147 static void __net_exit afs_net_exit(struct net *net_ns)
148 {
149 struct afs_net *net = afs_net(net_ns);
150
151 net->live = false;
152 afs_fs_probe_cleanup(net);
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 kfree_rcu(rcu_access_pointer(net->address_prefs), rcu);
159 }
160
161 static struct pernet_operations afs_net_ops = {
162 .init = afs_net_init,
163 .exit = afs_net_exit,
164 .id = &afs_net_id,
165 .size = sizeof(struct afs_net),
166 };
167
168 /*
169 * initialise the AFS client FS module
170 */
afs_init(void)171 static int __init afs_init(void)
172 {
173 int ret = -ENOMEM;
174
175 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
176
177 afs_wq = alloc_workqueue("afs", 0, 0);
178 if (!afs_wq)
179 goto error_afs_wq;
180 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
181 if (!afs_async_calls)
182 goto error_async;
183 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
184 if (!afs_lock_manager)
185 goto error_lockmgr;
186
187 ret = register_pernet_device(&afs_net_ops);
188 if (ret < 0)
189 goto error_net;
190
191 /* register the filesystems */
192 ret = afs_fs_init();
193 if (ret < 0)
194 goto error_fs;
195
196 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
197 if (!afs_proc_symlink) {
198 ret = -ENOMEM;
199 goto error_proc;
200 }
201
202 return ret;
203
204 error_proc:
205 afs_fs_exit();
206 error_fs:
207 unregister_pernet_device(&afs_net_ops);
208 error_net:
209 destroy_workqueue(afs_lock_manager);
210 error_lockmgr:
211 destroy_workqueue(afs_async_calls);
212 error_async:
213 destroy_workqueue(afs_wq);
214 error_afs_wq:
215 rcu_barrier();
216 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
217 return ret;
218 }
219
220 /* XXX late_initcall is kludgy, but the only alternative seems to create
221 * a transport upon the first mount, which is worse. Or is it?
222 */
223 late_initcall(afs_init); /* must be called after net/ to create socket */
224
225 /*
226 * clean up on module removal
227 */
afs_exit(void)228 static void __exit afs_exit(void)
229 {
230 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
231
232 proc_remove(afs_proc_symlink);
233 afs_fs_exit();
234 unregister_pernet_device(&afs_net_ops);
235 destroy_workqueue(afs_lock_manager);
236 destroy_workqueue(afs_async_calls);
237 destroy_workqueue(afs_wq);
238 afs_clean_up_permit_cache();
239 rcu_barrier();
240 }
241
242 module_exit(afs_exit);
243