aboutsummaryrefslogtreecommitdiff
path: root/fs/afs/cache.c
blob: de0d7de69edc4764b98f3d2ff098225e0e18e5fe (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
/* AFS caching stuff
 *
 * Copyright (C) 2007 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.
 */

#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_cell_cache_match(void *target,
						const void *entry);
static void afs_cell_cache_update(void *source, void *entry);

struct cachefs_index_def afs_cache_cell_index_def = {
	.name			= "cell_ix",
	.data_size		= sizeof(struct afs_cache_cell),
	.keys[0]		= { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
	.match			= afs_cell_cache_match,
	.update			= afs_cell_cache_update,
};
#endif

/*
 * match a cell record obtained from the cache
 */
#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_cell_cache_match(void *target,
						const void *entry)
{
	const struct afs_cache_cell *ccell = entry;
	struct afs_cell *cell = target;

	_enter("{%s},{%s}", ccell->name, cell->name);

	if (strncmp(ccell->name, cell->name, sizeof(ccell->name)) == 0) {
		_leave(" = SUCCESS");
		return CACHEFS_MATCH_SUCCESS;
	}

	_leave(" = FAILED");
	return CACHEFS_MATCH_FAILED;
}
#endif

/*
 * update a cell record in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static void afs_cell_cache_update(void *source, void *entry)
{
	struct afs_cache_cell *ccell = entry;
	struct afs_cell *cell = source;

	_enter("%p,%p", source, entry);

	strncpy(ccell->name, cell->name, sizeof(ccell->name));

	memcpy(ccell->vl_servers,
	       cell->vl_addrs,
	       min(sizeof(ccell->vl_servers), sizeof(cell->vl_addrs)));

}
#endif

#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_vlocation_cache_match(void *target,
						     const void *entry);
static void afs_vlocation_cache_update(void *source, void *entry);

struct cachefs_index_def afs_vlocation_cache_index_def = {
	.name		= "vldb",
	.data_size	= sizeof(struct afs_cache_vlocation),
	.keys[0]	= { CACHEFS_INDEX_KEYS_ASCIIZ, 64 },
	.match		= afs_vlocation_cache_match,
	.update		= afs_vlocation_cache_update,
};
#endif

/*
 * match a VLDB record stored in the cache
 * - may also load target from entry
 */
#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_vlocation_cache_match(void *target,
						     const void *entry)
{
	const struct afs_cache_vlocation *vldb = entry;
	struct afs_vlocation *vlocation = target;

	_enter("{%s},{%s}", vlocation->vldb.name, vldb->name);

	if (strncmp(vlocation->vldb.name, vldb->name, sizeof(vldb->name)) == 0
	    ) {
		if (!vlocation->valid ||
		    vlocation->vldb.rtime == vldb->rtime
		    ) {
			vlocation->vldb = *vldb;
			vlocation->valid = 1;
			_leave(" = SUCCESS [c->m]");
			return CACHEFS_MATCH_SUCCESS;
		} else if (memcmp(&vlocation->vldb, vldb, sizeof(*vldb)) != 0) {
			/* delete if VIDs for this name differ */
			if (memcmp(&vlocation->vldb.vid,
				   &vldb->vid,
				   sizeof(vldb->vid)) != 0) {
				_leave(" = DELETE");
				return CACHEFS_MATCH_SUCCESS_DELETE;
			}

			_leave(" = UPDATE");
			return CACHEFS_MATCH_SUCCESS_UPDATE;
		} else {
			_leave(" = SUCCESS");
			return CACHEFS_MATCH_SUCCESS;
		}
	}

	_leave(" = FAILED");
	return CACHEFS_MATCH_FAILED;
}
#endif

/*
 * update a VLDB record stored in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static void afs_vlocation_cache_update(void *source, void *entry)
{
	struct afs_cache_vlocation *vldb = entry;
	struct afs_vlocation *vlocation = source;

	_enter("");

	*vldb = vlocation->vldb;
}
#endif

#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_volume_cache_match(void *target,
						  const void *entry);
static void afs_volume_cache_update(void *source, void *entry);

struct cachefs_index_def afs_volume_cache_index_def = {
	.name		= "volume",
	.data_size	= sizeof(struct afs_cache_vhash),
	.keys[0]	= { CACHEFS_INDEX_KEYS_BIN, 1 },
	.keys[1]	= { CACHEFS_INDEX_KEYS_BIN, 1 },
	.match		= afs_volume_cache_match,
	.update		= afs_volume_cache_update,
};
#endif

/*
 * match a volume hash record stored in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_volume_cache_match(void *target,
						  const void *entry)
{
	const struct afs_cache_vhash *vhash = entry;
	struct afs_volume *volume = target;

	_enter("{%u},{%u}", volume->type, vhash->vtype);

	if (volume->type == vhash->vtype) {
		_leave(" = SUCCESS");
		return CACHEFS_MATCH_SUCCESS;
	}

	_leave(" = FAILED");
	return CACHEFS_MATCH_FAILED;
}
#endif

/*
 * update a volume hash record stored in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static void afs_volume_cache_update(void *source, void *entry)
{
	struct afs_cache_vhash *vhash = entry;
	struct afs_volume *volume = source;

	_enter("");

	vhash->vtype = volume->type;
}
#endif

#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_vnode_cache_match(void *target,
						 const void *entry);
static void afs_vnode_cache_update(void *source, void *entry);

struct cachefs_index_def afs_vnode_cache_index_def = {
	.name		= "vnode",
	.data_size	= sizeof(struct afs_cache_vnode),
	.keys[0]	= { CACHEFS_INDEX_KEYS_BIN, 4 },
	.match		= afs_vnode_cache_match,
	.update		= afs_vnode_cache_update,
};
#endif

/*
 * match a vnode record stored in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static cachefs_match_val_t afs_vnode_cache_match(void *target,
						 const void *entry)
{
	const struct afs_cache_vnode *cvnode = entry;
	struct afs_vnode *vnode = target;

	_enter("{%x,%x,%Lx},{%x,%x,%Lx}",
	       vnode->fid.vnode,
	       vnode->fid.unique,
	       vnode->status.version,
	       cvnode->vnode_id,
	       cvnode->vnode_unique,
	       cvnode->data_version);

	if (vnode->fid.vnode != cvnode->vnode_id) {
		_leave(" = FAILED");
		return CACHEFS_MATCH_FAILED;
	}

	if (vnode->fid.unique != cvnode->vnode_unique ||
	    vnode->status.version != cvnode->data_version) {
		_leave(" = DELETE");
		return CACHEFS_MATCH_SUCCESS_DELETE;
	}

	_leave(" = SUCCESS");
	return CACHEFS_MATCH_SUCCESS;
}
#endif

/*
 * update a vnode record stored in the cache
 */
#ifdef AFS_CACHING_SUPPORT
static void afs_vnode_cache_update(void *source, void *entry)
{
	struct afs_cache_vnode *cvnode = entry;
	struct afs_vnode *vnode = source;

	_enter("");

	cvnode->vnode_id	= vnode->fid.vnode;
	cvnode->vnode_unique	= vnode->fid.unique;
	cvnode->data_version	= vnode->status.version;
}
#endif