xref: /linux/fs/afs/main.c (revision 03c11eb3b16dc0058589751dfd91f254be2be613)
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  */
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_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 	INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
100 	timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
101 	atomic_set(&net->servers_outstanding, 1);
102 
103 	ret = -ENOMEM;
104 	sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
105 	if (!sysnames)
106 		goto error_sysnames;
107 	sysnames->subs[0] = (char *)&afs_init_sysname;
108 	sysnames->nr = 1;
109 	refcount_set(&sysnames->usage, 1);
110 	net->sysnames = sysnames;
111 	rwlock_init(&net->sysnames_lock);
112 
113 	/* Register the /proc stuff */
114 	ret = afs_proc_init(net);
115 	if (ret < 0)
116 		goto error_proc;
117 
118 	/* Initialise the cell DB */
119 	ret = afs_cell_init(net, rootcell);
120 	if (ret < 0)
121 		goto error_cell_init;
122 
123 	/* Create the RxRPC transport */
124 	ret = afs_open_socket(net);
125 	if (ret < 0)
126 		goto error_open_socket;
127 
128 	return 0;
129 
130 error_open_socket:
131 	net->live = false;
132 	afs_fs_probe_cleanup(net);
133 	afs_cell_purge(net);
134 	afs_purge_servers(net);
135 error_cell_init:
136 	net->live = false;
137 	afs_proc_cleanup(net);
138 error_proc:
139 	afs_put_sysnames(net->sysnames);
140 error_sysnames:
141 	net->live = false;
142 	return ret;
143 }
144 
145 /*
146  * Clean up and destroy an AFS network namespace record.
147  */
148 static 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_fs_probe_cleanup(net);
154 	afs_cell_purge(net);
155 	afs_purge_servers(net);
156 	afs_close_socket(net);
157 	afs_proc_cleanup(net);
158 	afs_put_sysnames(net->sysnames);
159 	kfree_rcu(rcu_access_pointer(net->address_prefs), rcu);
160 }
161 
162 static struct pernet_operations afs_net_ops = {
163 	.init	= afs_net_init,
164 	.exit	= afs_net_exit,
165 	.id	= &afs_net_id,
166 	.size	= sizeof(struct afs_net),
167 };
168 
169 /*
170  * initialise the AFS client FS module
171  */
172 static int __init afs_init(void)
173 {
174 	int ret = -ENOMEM;
175 
176 	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
177 
178 	afs_wq = alloc_workqueue("afs", 0, 0);
179 	if (!afs_wq)
180 		goto error_afs_wq;
181 	afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
182 	if (!afs_async_calls)
183 		goto error_async;
184 	afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
185 	if (!afs_lock_manager)
186 		goto error_lockmgr;
187 
188 	ret = register_pernet_device(&afs_net_ops);
189 	if (ret < 0)
190 		goto error_net;
191 
192 	/* register the filesystems */
193 	ret = afs_fs_init();
194 	if (ret < 0)
195 		goto error_fs;
196 
197 	afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
198 	if (!afs_proc_symlink) {
199 		ret = -ENOMEM;
200 		goto error_proc;
201 	}
202 
203 	return ret;
204 
205 error_proc:
206 	afs_fs_exit();
207 error_fs:
208 	unregister_pernet_device(&afs_net_ops);
209 error_net:
210 	destroy_workqueue(afs_lock_manager);
211 error_lockmgr:
212 	destroy_workqueue(afs_async_calls);
213 error_async:
214 	destroy_workqueue(afs_wq);
215 error_afs_wq:
216 	rcu_barrier();
217 	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
218 	return ret;
219 }
220 
221 /* XXX late_initcall is kludgy, but the only alternative seems to create
222  * a transport upon the first mount, which is worse. Or is it?
223  */
224 late_initcall(afs_init);	/* must be called after net/ to create socket */
225 
226 /*
227  * clean up on module removal
228  */
229 static void __exit afs_exit(void)
230 {
231 	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
232 
233 	proc_remove(afs_proc_symlink);
234 	afs_fs_exit();
235 	unregister_pernet_device(&afs_net_ops);
236 	destroy_workqueue(afs_lock_manager);
237 	destroy_workqueue(afs_async_calls);
238 	destroy_workqueue(afs_wq);
239 	afs_clean_up_permit_cache();
240 	rcu_barrier();
241 }
242 
243 module_exit(afs_exit);
244