aboutsummaryrefslogtreecommitdiff
path: root/fs/afs/main.c
blob: 913c689bdb357d3a8550ab573cd4a69386820575 (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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/* main.c: AFS client file system
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/completion.h>
#include <rxrpc/rxrpc.h>
#include <rxrpc/transport.h>
#include <rxrpc/call.h>
#include <rxrpc/peer.h>
#include "cache.h"
#include "cell.h"
#include "server.h"
#include "fsclient.h"
#include "cmservice.h"
#include "kafstimod.h"
#include "kafsasyncd.h"
#include "internal.h"

struct rxrpc_transport *afs_transport;

static int afs_adding_peer(struct rxrpc_peer *peer);
static void afs_discarding_peer(struct rxrpc_peer *peer);


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

static char *rootcell;

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


static struct rxrpc_peer_ops afs_peer_ops = {
	.adding		= afs_adding_peer,
	.discarding	= afs_discarding_peer,
};

struct list_head afs_cb_hash_tbl[AFS_CB_HASH_COUNT];
DEFINE_SPINLOCK(afs_cb_hash_lock);

#ifdef AFS_CACHING_SUPPORT
static struct cachefs_netfs_operations afs_cache_ops = {
	.get_page_cookie	= afs_cache_get_page_cookie,
};

struct cachefs_netfs afs_cache_netfs = {
	.name			= "afs",
	.version		= 0,
	.ops			= &afs_cache_ops,
};
#endif

/*****************************************************************************/
/*
 * initialise the AFS client FS module
 */
static int __init afs_init(void)
{
	int loop, ret;

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

	/* initialise the callback hash table */
	spin_lock_init(&afs_cb_hash_lock);
	for (loop = AFS_CB_HASH_COUNT - 1; loop >= 0; loop--)
		INIT_LIST_HEAD(&afs_cb_hash_tbl[loop]);

	/* register the /proc stuff */
	ret = afs_proc_init();
	if (ret < 0)
		return ret;

#ifdef AFS_CACHING_SUPPORT
	/* we want to be able to cache */
	ret = cachefs_register_netfs(&afs_cache_netfs,
				     &afs_cache_cell_index_def);
	if (ret < 0)
		goto error;
#endif

#ifdef CONFIG_KEYS_TURNED_OFF
	ret = afs_key_register();
	if (ret < 0)
		goto error_cache;
#endif

	/* initialise the cell DB */
	ret = afs_cell_init(rootcell);
	if (ret < 0)
		goto error_keys;

	/* start the timeout daemon */
	ret = afs_kafstimod_start();
	if (ret < 0)
		goto error_keys;

	/* start the async operation daemon */
	ret = afs_kafsasyncd_start();
	if (ret < 0)
		goto error_kafstimod;

	/* create the RxRPC transport */
	ret = rxrpc_create_transport(7001, &afs_transport);
	if (ret < 0)
		goto error_kafsasyncd;

	afs_transport->peer_ops = &afs_peer_ops;

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

	return ret;

 error_transport:
	rxrpc_put_transport(afs_transport);
 error_kafsasyncd:
	afs_kafsasyncd_stop();
 error_kafstimod:
	afs_kafstimod_stop();
 error_keys:
#ifdef CONFIG_KEYS_TURNED_OFF
	afs_key_unregister();
 error_cache:
#endif
#ifdef AFS_CACHING_SUPPORT
	cachefs_unregister_netfs(&afs_cache_netfs);
 error:
#endif
	afs_cell_purge();
	afs_proc_cleanup();
	printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
	return ret;
} /* end afs_init() */

/* 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");

	afs_fs_exit();
	rxrpc_put_transport(afs_transport);
	afs_kafstimod_stop();
	afs_kafsasyncd_stop();
	afs_cell_purge();
#ifdef CONFIG_KEYS_TURNED_OFF
	afs_key_unregister();
#endif
#ifdef AFS_CACHING_SUPPORT
	cachefs_unregister_netfs(&afs_cache_netfs);
#endif
	afs_proc_cleanup();

} /* end afs_exit() */

module_exit(afs_exit);

/*****************************************************************************/
/*
 * notification that new peer record is being added
 * - called from krxsecd
 * - return an error to induce an abort
 * - mustn't sleep (caller holds an rwlock)
 */
static int afs_adding_peer(struct rxrpc_peer *peer)
{
	struct afs_server *server;
	int ret;

	_debug("kAFS: Adding new peer %08x\n", ntohl(peer->addr.s_addr));

	/* determine which server the peer resides in (if any) */
	ret = afs_server_find_by_peer(peer, &server);
	if (ret < 0)
		return ret; /* none that we recognise, so abort */

	_debug("Server %p{u=%d}\n", server, atomic_read(&server->usage));

	_debug("Cell %p{u=%d}\n",
	       server->cell, atomic_read(&server->cell->usage));

	/* cross-point the structs under a global lock */
	spin_lock(&afs_server_peer_lock);
	peer->user = server;
	server->peer = peer;
	spin_unlock(&afs_server_peer_lock);

	afs_put_server(server);

	return 0;
} /* end afs_adding_peer() */

/*****************************************************************************/
/*
 * notification that a peer record is being discarded
 * - called from krxiod or krxsecd
 */
static void afs_discarding_peer(struct rxrpc_peer *peer)
{
	struct afs_server *server;

	_enter("%p",peer);

	_debug("Discarding peer %08x (rtt=%lu.%lumS)\n",
	       ntohl(peer->addr.s_addr),
	       (long) (peer->rtt / 1000),
	       (long) (peer->rtt % 1000));

	/* uncross-point the structs under a global lock */
	spin_lock(&afs_server_peer_lock);
	server = peer->user;
	if (server) {
		peer->user = NULL;
		server->peer = NULL;
	}
	spin_unlock(&afs_server_peer_lock);

	_leave("");

} /* end afs_discarding_peer() */

/*****************************************************************************/
/*
 * clear the dead space between task_struct and kernel stack
 * - called by supplying -finstrument-functions to gcc
 */
#if 0
void __cyg_profile_func_enter (void *this_fn, void *call_site)
__attribute__((no_instrument_function));

void __cyg_profile_func_enter (void *this_fn, void *call_site)
{
       asm volatile("  movl    %%esp,%%edi     \n"
                    "  andl    %0,%%edi        \n"
                    "  addl    %1,%%edi        \n"
                    "  movl    %%esp,%%ecx     \n"
                    "  subl    %%edi,%%ecx     \n"
                    "  shrl    $2,%%ecx        \n"
                    "  movl    $0xedededed,%%eax     \n"
                    "  rep stosl               \n"
                    :
                    : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
                    : "eax", "ecx", "edi", "memory", "cc"
                    );
}

void __cyg_profile_func_exit(void *this_fn, void *call_site)
__attribute__((no_instrument_function));

void __cyg_profile_func_exit(void *this_fn, void *call_site)
{
       asm volatile("  movl    %%esp,%%edi     \n"
                    "  andl    %0,%%edi        \n"
                    "  addl    %1,%%edi        \n"
                    "  movl    %%esp,%%ecx     \n"
                    "  subl    %%edi,%%ecx     \n"
                    "  shrl    $2,%%ecx        \n"
                    "  movl    $0xdadadada,%%eax     \n"
                    "  rep stosl               \n"
                    :
                    : "i"(~(THREAD_SIZE - 1)), "i"(sizeof(struct thread_info))
                    : "eax", "ecx", "edi", "memory", "cc"
                    );
}
#endif