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: net_ns);
69 int ret;
70
71 net->net = net_ns;
72 net->live = true;
73 generate_random_uuid(uuid: (unsigned char *)&net->uuid);
74
75 INIT_WORK(&net->charge_preallocation_work, afs_charge_preallocation);
76 INIT_WORK(&net->rx_oob_work, afs_process_oob_queue);
77 mutex_init(&net->socket_mutex);
78
79 net->cells = RB_ROOT;
80 idr_init(idr: &net->cells_dyn_ino);
81 init_rwsem(&net->cells_lock);
82 mutex_init(&net->cells_alias_lock);
83 mutex_init(&net->proc_cells_lock);
84 INIT_HLIST_HEAD(&net->proc_cells);
85
86 seqlock_init(&net->fs_lock);
87 INIT_LIST_HEAD(list: &net->fs_probe_fast);
88 INIT_LIST_HEAD(list: &net->fs_probe_slow);
89 INIT_HLIST_HEAD(&net->fs_proc);
90
91 INIT_WORK(&net->fs_prober, afs_fs_probe_dispatcher);
92 timer_setup(&net->fs_probe_timer, afs_fs_probe_timer, 0);
93 atomic_set(v: &net->servers_outstanding, i: 1);
94
95 ret = -ENOMEM;
96 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
97 if (!sysnames)
98 goto error_sysnames;
99 sysnames->subs[0] = (char *)&afs_init_sysname;
100 sysnames->nr = 1;
101 refcount_set(r: &sysnames->usage, n: 1);
102 net->sysnames = sysnames;
103 rwlock_init(&net->sysnames_lock);
104
105 /* Register the /proc stuff */
106 ret = afs_proc_init(net);
107 if (ret < 0)
108 goto error_proc;
109
110 /* Initialise the cell DB */
111 ret = afs_cell_init(net, rootcell);
112 if (ret < 0)
113 goto error_cell_init;
114
115 /* Create the RxRPC transport */
116 ret = afs_open_socket(net);
117 if (ret < 0)
118 goto error_open_socket;
119
120 return 0;
121
122error_open_socket:
123 net->live = false;
124 afs_fs_probe_cleanup(net);
125 afs_cell_purge(net);
126 afs_wait_for_servers(net);
127error_cell_init:
128 net->live = false;
129 afs_proc_cleanup(net);
130error_proc:
131 afs_put_sysnames(net->sysnames);
132error_sysnames:
133 idr_destroy(&net->cells_dyn_ino);
134 net->live = false;
135 return ret;
136}
137
138/*
139 * Clean up and destroy an AFS network namespace record.
140 */
141static void __net_exit afs_net_exit(struct net *net_ns)
142{
143 struct afs_net *net = afs_net(net: net_ns);
144
145 net->live = false;
146 afs_fs_probe_cleanup(net);
147 afs_cell_purge(net);
148 afs_wait_for_servers(net);
149 afs_close_socket(net);
150 afs_proc_cleanup(net);
151 afs_put_sysnames(net->sysnames);
152 idr_destroy(&net->cells_dyn_ino);
153 kfree_rcu(rcu_access_pointer(net->address_prefs), rcu);
154}
155
156static struct pernet_operations afs_net_ops = {
157 .init = afs_net_init,
158 .exit = afs_net_exit,
159 .id = &afs_net_id,
160 .size = sizeof(struct afs_net),
161};
162
163/*
164 * initialise the AFS client FS module
165 */
166static int __init afs_init(void)
167{
168 int ret = -ENOMEM;
169
170 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 registering.\n");
171
172 afs_wq = alloc_workqueue("afs", WQ_PERCPU, 0);
173 if (!afs_wq)
174 goto error_afs_wq;
175 afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
176 if (!afs_async_calls)
177 goto error_async;
178 afs_lock_manager = alloc_workqueue("kafs_lockd", WQ_MEM_RECLAIM | WQ_PERCPU, 0);
179 if (!afs_lock_manager)
180 goto error_lockmgr;
181
182 ret = register_pernet_device(&afs_net_ops);
183 if (ret < 0)
184 goto error_net;
185
186 /* register the filesystems */
187 ret = afs_fs_init();
188 if (ret < 0)
189 goto error_fs;
190
191 afs_proc_symlink = proc_symlink("fs/afs", NULL, "../self/net/afs");
192 if (!afs_proc_symlink) {
193 ret = -ENOMEM;
194 goto error_proc;
195 }
196
197 return ret;
198
199error_proc:
200 afs_fs_exit();
201error_fs:
202 unregister_pernet_device(&afs_net_ops);
203error_net:
204 destroy_workqueue(wq: afs_lock_manager);
205error_lockmgr:
206 destroy_workqueue(wq: afs_async_calls);
207error_async:
208 destroy_workqueue(wq: afs_wq);
209error_afs_wq:
210 rcu_barrier();
211 printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
212 return ret;
213}
214
215/* XXX late_initcall is kludgy, but the only alternative seems to create
216 * a transport upon the first mount, which is worse. Or is it?
217 */
218late_initcall(afs_init); /* must be called after net/ to create socket */
219
220/*
221 * clean up on module removal
222 */
223static void __exit afs_exit(void)
224{
225 printk(KERN_INFO "kAFS: Red Hat AFS client v0.1 unregistering.\n");
226
227 proc_remove(afs_proc_symlink);
228 afs_fs_exit();
229 unregister_pernet_device(&afs_net_ops);
230 destroy_workqueue(wq: afs_lock_manager);
231 destroy_workqueue(wq: afs_async_calls);
232 destroy_workqueue(wq: afs_wq);
233 afs_clean_up_permit_cache();
234 rcu_barrier();
235}
236
237module_exit(afs_exit);
238

source code of linux/fs/afs/main.c