1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /* AFS caching stuff
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
5*4882a593Smuzhiyun * Written by David Howells (dhowells@redhat.com)
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/sched.h>
9*4882a593Smuzhiyun #include "internal.h"
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
12*4882a593Smuzhiyun const void *buffer,
13*4882a593Smuzhiyun uint16_t buflen,
14*4882a593Smuzhiyun loff_t object_size);
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun struct fscache_netfs afs_cache_netfs = {
17*4882a593Smuzhiyun .name = "afs",
18*4882a593Smuzhiyun .version = 2,
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct fscache_cookie_def afs_cell_cache_index_def = {
22*4882a593Smuzhiyun .name = "AFS.cell",
23*4882a593Smuzhiyun .type = FSCACHE_COOKIE_TYPE_INDEX,
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun struct fscache_cookie_def afs_volume_cache_index_def = {
27*4882a593Smuzhiyun .name = "AFS.volume",
28*4882a593Smuzhiyun .type = FSCACHE_COOKIE_TYPE_INDEX,
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun struct fscache_cookie_def afs_vnode_cache_index_def = {
32*4882a593Smuzhiyun .name = "AFS.vnode",
33*4882a593Smuzhiyun .type = FSCACHE_COOKIE_TYPE_DATAFILE,
34*4882a593Smuzhiyun .check_aux = afs_vnode_cache_check_aux,
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun /*
38*4882a593Smuzhiyun * check that the auxiliary data indicates that the entry is still valid
39*4882a593Smuzhiyun */
afs_vnode_cache_check_aux(void * cookie_netfs_data,const void * buffer,uint16_t buflen,loff_t object_size)40*4882a593Smuzhiyun static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
41*4882a593Smuzhiyun const void *buffer,
42*4882a593Smuzhiyun uint16_t buflen,
43*4882a593Smuzhiyun loff_t object_size)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun struct afs_vnode *vnode = cookie_netfs_data;
46*4882a593Smuzhiyun struct afs_vnode_cache_aux aux;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun _enter("{%llx,%x,%llx},%p,%u",
49*4882a593Smuzhiyun vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
50*4882a593Smuzhiyun buffer, buflen);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun memcpy(&aux, buffer, sizeof(aux));
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /* check the size of the data is what we're expecting */
55*4882a593Smuzhiyun if (buflen != sizeof(aux)) {
56*4882a593Smuzhiyun _leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
57*4882a593Smuzhiyun return FSCACHE_CHECKAUX_OBSOLETE;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (vnode->status.data_version != aux.data_version) {
61*4882a593Smuzhiyun _leave(" = OBSOLETE [vers %llx != %llx]",
62*4882a593Smuzhiyun aux.data_version, vnode->status.data_version);
63*4882a593Smuzhiyun return FSCACHE_CHECKAUX_OBSOLETE;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun _leave(" = SUCCESS");
67*4882a593Smuzhiyun return FSCACHE_CHECKAUX_OKAY;
68*4882a593Smuzhiyun }
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