Linux kernel mirror (for testing)
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1/*
2 * fs/cifs/cache.c - CIFS filesystem cache index structure definitions
3 *
4 * Copyright (c) 2010 Novell, Inc.
5 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include "fscache.h"
22#include "cifs_debug.h"
23
24/*
25 * CIFS filesystem definition for FS-Cache
26 */
27struct fscache_netfs cifs_fscache_netfs = {
28 .name = "cifs",
29 .version = 0,
30};
31
32/*
33 * Register CIFS for caching with FS-Cache
34 */
35int cifs_fscache_register(void)
36{
37 return fscache_register_netfs(&cifs_fscache_netfs);
38}
39
40/*
41 * Unregister CIFS for caching
42 */
43void cifs_fscache_unregister(void)
44{
45 fscache_unregister_netfs(&cifs_fscache_netfs);
46}
47
48/*
49 * Server object for FS-Cache
50 */
51const struct fscache_cookie_def cifs_fscache_server_index_def = {
52 .name = "CIFS.server",
53 .type = FSCACHE_COOKIE_TYPE_INDEX,
54};
55
56static enum
57fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
58 const void *data,
59 uint16_t datalen,
60 loff_t object_size)
61{
62 struct cifs_fscache_super_auxdata auxdata;
63 const struct cifs_tcon *tcon = cookie_netfs_data;
64
65 if (datalen != sizeof(auxdata))
66 return FSCACHE_CHECKAUX_OBSOLETE;
67
68 memset(&auxdata, 0, sizeof(auxdata));
69 auxdata.resource_id = tcon->resource_id;
70 auxdata.vol_create_time = tcon->vol_create_time;
71 auxdata.vol_serial_number = tcon->vol_serial_number;
72
73 if (memcmp(data, &auxdata, datalen) != 0)
74 return FSCACHE_CHECKAUX_OBSOLETE;
75
76 return FSCACHE_CHECKAUX_OKAY;
77}
78
79/*
80 * Superblock object for FS-Cache
81 */
82const struct fscache_cookie_def cifs_fscache_super_index_def = {
83 .name = "CIFS.super",
84 .type = FSCACHE_COOKIE_TYPE_INDEX,
85 .check_aux = cifs_fscache_super_check_aux,
86};
87
88static enum
89fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
90 const void *data,
91 uint16_t datalen,
92 loff_t object_size)
93{
94 struct cifs_fscache_inode_auxdata auxdata;
95 struct cifsInodeInfo *cifsi = cookie_netfs_data;
96
97 if (datalen != sizeof(auxdata))
98 return FSCACHE_CHECKAUX_OBSOLETE;
99
100 memset(&auxdata, 0, sizeof(auxdata));
101 auxdata.eof = cifsi->server_eof;
102 auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
103 auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
104 auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
105 auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
106
107 if (memcmp(data, &auxdata, datalen) != 0)
108 return FSCACHE_CHECKAUX_OBSOLETE;
109
110 return FSCACHE_CHECKAUX_OKAY;
111}
112
113const struct fscache_cookie_def cifs_fscache_inode_object_def = {
114 .name = "CIFS.uniqueid",
115 .type = FSCACHE_COOKIE_TYPE_DATAFILE,
116 .check_aux = cifs_fscache_inode_check_aux,
117};