Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: c9c45d7078bd184bc85417783160c9cb813f0222 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS client file system
 *
 * Copyright (C) 2002,5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/random.h>
#include <linux/proc_fs.h>
#define CREATE_TRACE_POINTS
#include "internal.h"

MODULE_DESCRIPTION("AFS Client File System");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");

unsigned afs_debug;
module_param_named(debug, afs_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(debug, "AFS debugging mask");

static char *rootcell;

module_param(rootcell, charp, 0);
MODULE_PARM_DESC(rootcell, "root AFS cell name and VL server IP addr list");

struct workqueue_struct *afs_wq;
static struct proc_dir_entry *afs_proc_symlink;

#if defined(CONFIG_ALPHA)
const char afs_init_sysname[] = "alpha_linux26";
#elif defined(CONFIG_X86_64)
const char afs_init_sysname[] = "amd64_linux26";
#elif defined(CONFIG_ARM)
const char afs_init_sysname[] = "arm_linux26";
#elif defined(CONFIG_ARM64)
const char afs_init_sysname[] = "aarch64_linux26";
#elif defined(CONFIG_X86_32)
const char afs_init_sysname[] = "i386_linux26";
#elif defined(CONFIG_IA64)
const char afs_init_sysname[] = "ia64_linux26";
#elif defined(CONFIG_PPC64)
const char afs_init_sysname[] = "ppc64_linux26";
#elif defined(CONFIG_PPC32)
const char afs_init_sysname[] = "ppc_linux26";
#elif defined(CONFIG_S390)
#ifdef CONFIG_64BIT
const char afs_init_sysname[] = "s390x_linux26";
#else
const char afs_init_sysname[] = "s390_linux26";
#endif
#elif defined(CONFIG_SPARC64)
const char afs_init_sysname[] = "sparc64_linux26";
#elif defined(CONFIG_SPARC32)
const char afs_init_sysname[] = "sparc_linux26";
#else
const char afs_init_sysname[] = "unknown_linux26";
#endif

/*
 * Initialise an AFS network namespace record.
 */
static int __net_init afs_net_init(struct net *net_ns)
{
	struct afs_sysnames *sysnames;
	struct afs_net *net = afs_net(net_ns);
	int ret;

	net->net = net_ns;
	net->live = true;
	generate_random_uuid((unsigned char *)&net->uuid);

	INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
	mutex_init(&net->socket_mutex);

	net->cells = RB_ROOT;
	seqlock_init(&net->cells_lock);
	INIT_WORK(&net->cells_manager, afs_manage_cells);
	timer_setup(&net->cells_timer, afs_cells_timer, 0);

	mutex_init(&net->proc_cells_lock);
	INIT_HLIST_HEAD(&net->proc_cells);

	seqlock_init(&net->fs_lock);
	net->fs_servers = RB_ROOT;
	INIT_LIST_HEAD(&net->fs_updates);
	INIT_HLIST_HEAD(&net->fs_proc);

	INIT_HLIST_HEAD(&net->fs_addresses4);
	INIT_HLIST_HEAD(&net->fs_addresses6);
	seqlock_init(&net->fs_addr_lock);

	INIT_WORK(&net->fs_manager, afs_manage_servers);
	timer_setup(&net->fs_timer, afs_servers_timer, 0);

	ret = -ENOMEM;
	sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
	if (!sysnames)
		goto error_sysnames;
	sysnames->subs[0] = (char *)&afs_init_sysname;
	sysnames->nr = 1;
	refcount_set(&sysnames->usage, 1);
	net->sysnames = sysnames;
	rwlock_init(&net->sysnames_lock);

	/* Register the /proc stuff */
	ret = afs_proc_init(net);
	if (ret < 0)
		goto error_proc;

	/* Initialise the cell DB */
	ret = afs_cell_init(net, rootcell);
	if (ret < 0)
		goto error_cell_init;

	/* Create the RxRPC transport */
	ret = afs_open_socket(net);
	if (ret < 0)
		goto error_open_socket;

	return 0;

error_open_socket:
	net->live = false;
	afs_cell_purge(net);
	afs_purge_servers(net);
error_cell_init:
	net->live = false;
	afs_proc_cleanup(net);
error_proc:
	afs_put_sysnames(net->sysnames);
error_sysnames:
	net->live = false;
	return ret;
}

/*
 * Clean up and destroy an AFS network namespace record.
 */
static void __net_exit afs_net_exit(struct net *net_ns)
{
	struct afs_net *net = afs_net(net_ns);

	net->live = false;
	afs_cell_purge(net);
	afs_purge_servers(net);
	afs_close_socket(net);
	afs_proc_cleanup(net);
	afs_put_sysnames(net->sysnames);
}

static struct pernet_operations afs_net_ops = {
	.init	= afs_net_init,
	.exit	= afs_net_exit,
	.id	= &afs_net_id,
	.size	= sizeof(struct afs_net),
};

/*
 * initialise the AFS client FS module
 */
static int __init afs_init(void)
{
	int ret = -ENOMEM;

	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");

	afs_wq = alloc_workqueue("afs", 0, 0);
	if (!afs_wq)
		goto error_afs_wq;
	afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
	if (!afs_async_calls)
		goto error_async;
	afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM, 0);
	if (!afs_lock_manager)
		goto error_lockmgr;

#ifdef CONFIG_AFS_FSCACHE
	/* we want to be able to cache */
	ret = fscache_register_netfs(&afs_cache_netfs);
	if (ret < 0)
		goto error_cache;
#endif

	ret = register_pernet_subsys(&afs_net_ops);
	if (ret < 0)
		goto error_net;

	/* register the filesystems */
	ret = afs_fs_init();
	if (ret < 0)
		goto error_fs;

	afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
	if (IS_ERR(afs_proc_symlink)) {
		ret = PTR_ERR(afs_proc_symlink);
		goto error_proc;
	}

	return ret;

error_proc:
	afs_fs_exit();
error_fs:
	unregister_pernet_subsys(&afs_net_ops);
error_net:
#ifdef CONFIG_AFS_FSCACHE
	fscache_unregister_netfs(&afs_cache_netfs);
error_cache:
#endif
	destroy_workqueue(afs_lock_manager);
error_lockmgr:
	destroy_workqueue(afs_async_calls);
error_async:
	destroy_workqueue(afs_wq);
error_afs_wq:
	rcu_barrier();
	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
	return ret;
}

/* XXX late_initcall is kludgy, but the only alternative seems to create
 * a transport upon the first mount, which is worse. Or is it?
 */
late_initcall(afs_init);	/* must be called after net/ to create socket */

/*
 * clean up on module removal
 */
static void __exit afs_exit(void)
{
	printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");

	proc_remove(afs_proc_symlink);
	afs_fs_exit();
	unregister_pernet_subsys(&afs_net_ops);
#ifdef CONFIG_AFS_FSCACHE
	fscache_unregister_netfs(&afs_cache_netfs);
#endif
	destroy_workqueue(afs_lock_manager);
	destroy_workqueue(afs_async_calls);
	destroy_workqueue(afs_wq);
	afs_clean_up_permit_cache();
	rcu_barrier();
}

module_exit(afs_exit);