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
18MODULE_DESCRIPTION("AFS Client File System");
19MODULE_AUTHOR("Red Hat, Inc.");
20MODULE_LICENSE("GPL");
21
22unsigned afs_debug;
23module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
24MODULE_PARM_DESC(debug, "AFS debugging mask");
25
26static char *rootcell;
27
28module_param(rootcell, charp, 0);
29MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");
30
31struct workqueue_struct *afs_wq;
32static struct proc_dir_entry *afs_proc_symlink;
33
34#if defined(CONFIG_ALPHA)
35const char afs_init_sysname[] = "alpha_linux26";
36#elif defined(CONFIG_X86_64)
37const char afs_init_sysname[] = "amd64_linux26";
38#elif defined(CONFIG_ARM)
39const char afs_init_sysname[] = "arm_linux26";
40#elif defined(CONFIG_ARM64)
41const char afs_init_sysname[] = "aarch64_linux26";
42#elif defined(CONFIG_X86_32)
43const char afs_init_sysname[] = "i386_linux26";
44#elif defined(CONFIG_PPC64)
45const char afs_init_sysname[] = "ppc64_linux26";
46#elif defined(CONFIG_PPC32)
47const char afs_init_sysname[] = "ppc_linux26";
48#elif defined(CONFIG_S390)
49#ifdef CONFIG_64BIT
50const char afs_init_sysname[] = "s390x_linux26";
51#else
52const char afs_init_sysname[] = "s390_linux26";
53#endif
54#elif defined(CONFIG_SPARC64)
55const char afs_init_sysname[] = "sparc64_linux26";
56#elif defined(CONFIG_SPARC32)
57const char afs_init_sysname[] = "sparc_linux26";
58#else
59const char afs_init_sysname[] = "unknown_linux26";
60#endif
61
62/*
63 * Initialise an AFS network namespace record.
64 */
65static 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
129error_open_socket:
130	net->live = false;
131	afs_fs_probe_cleanup(net);
132	afs_cell_purge(net);
133	afs_purge_servers(net);
134error_cell_init:
135	net->live = false;
136	afs_proc_cleanup(net);
137error_proc:
138	afs_put_sysnames(net->sysnames);
139error_sysnames:
140	net->live = false;
141	return ret;
142}
143
144/*
145 * Clean up and destroy an AFS network namespace record.
146 */
147static 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
161static 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 */
171static 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
204error_proc:
205	afs_fs_exit();
206error_fs:
207	unregister_pernet_device(&afs_net_ops);
208error_net:
209	destroy_workqueue(afs_lock_manager);
210error_lockmgr:
211	destroy_workqueue(afs_async_calls);
212error_async:
213	destroy_workqueue(afs_wq);
214error_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 */
223late_initcall(afs_init);	/* must be called after net/ to create socket */
224
225/*
226 * clean up on module removal
227 */
228static 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
242module_exit(afs_exit);
243