1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * CIFS filesystem cache index structure definitions
4 *
5 * Copyright (c) 2010 Novell, Inc.
6 * Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
7 *
8 */
9 #include "fscache.h"
10 #include "cifs_debug.h"
11
12 /*
13 * CIFS filesystem definition for FS-Cache
14 */
15 struct fscache_netfs cifs_fscache_netfs = {
16 .name = "cifs",
17 .version = 0,
18 };
19
20 /*
21 * Register CIFS for caching with FS-Cache
22 */
cifs_fscache_register(void)23 int cifs_fscache_register(void)
24 {
25 return fscache_register_netfs(&cifs_fscache_netfs);
26 }
27
28 /*
29 * Unregister CIFS for caching
30 */
cifs_fscache_unregister(void)31 void cifs_fscache_unregister(void)
32 {
33 fscache_unregister_netfs(&cifs_fscache_netfs);
34 }
35
36 /*
37 * Server object for FS-Cache
38 */
39 const struct fscache_cookie_def cifs_fscache_server_index_def = {
40 .name = "CIFS.server",
41 .type = FSCACHE_COOKIE_TYPE_INDEX,
42 };
43
44 static enum
cifs_fscache_super_check_aux(void * cookie_netfs_data,const void * data,uint16_t datalen,loff_t object_size)45 fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
46 const void *data,
47 uint16_t datalen,
48 loff_t object_size)
49 {
50 struct cifs_fscache_super_auxdata auxdata;
51 const struct cifs_tcon *tcon = cookie_netfs_data;
52
53 if (datalen != sizeof(auxdata))
54 return FSCACHE_CHECKAUX_OBSOLETE;
55
56 memset(&auxdata, 0, sizeof(auxdata));
57 auxdata.resource_id = tcon->resource_id;
58 auxdata.vol_create_time = tcon->vol_create_time;
59 auxdata.vol_serial_number = tcon->vol_serial_number;
60
61 if (memcmp(data, &auxdata, datalen) != 0)
62 return FSCACHE_CHECKAUX_OBSOLETE;
63
64 return FSCACHE_CHECKAUX_OKAY;
65 }
66
67 /*
68 * Superblock object for FS-Cache
69 */
70 const struct fscache_cookie_def cifs_fscache_super_index_def = {
71 .name = "CIFS.super",
72 .type = FSCACHE_COOKIE_TYPE_INDEX,
73 .check_aux = cifs_fscache_super_check_aux,
74 };
75
76 static enum
cifs_fscache_inode_check_aux(void * cookie_netfs_data,const void * data,uint16_t datalen,loff_t object_size)77 fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
78 const void *data,
79 uint16_t datalen,
80 loff_t object_size)
81 {
82 struct cifs_fscache_inode_auxdata auxdata;
83 struct cifsInodeInfo *cifsi = cookie_netfs_data;
84
85 if (datalen != sizeof(auxdata))
86 return FSCACHE_CHECKAUX_OBSOLETE;
87
88 memset(&auxdata, 0, sizeof(auxdata));
89 auxdata.eof = cifsi->server_eof;
90 auxdata.last_write_time_sec = cifsi->vfs_inode.i_mtime.tv_sec;
91 auxdata.last_change_time_sec = cifsi->vfs_inode.i_ctime.tv_sec;
92 auxdata.last_write_time_nsec = cifsi->vfs_inode.i_mtime.tv_nsec;
93 auxdata.last_change_time_nsec = cifsi->vfs_inode.i_ctime.tv_nsec;
94
95 if (memcmp(data, &auxdata, datalen) != 0)
96 return FSCACHE_CHECKAUX_OBSOLETE;
97
98 return FSCACHE_CHECKAUX_OKAY;
99 }
100
101 const struct fscache_cookie_def cifs_fscache_inode_object_def = {
102 .name = "CIFS.uniqueid",
103 .type = FSCACHE_COOKIE_TYPE_DATAFILE,
104 .check_aux = cifs_fscache_inode_check_aux,
105 };
106