73 lines
2 KiB
C
73 lines
2 KiB
C
/* AFS caching stuff
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*
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* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include "internal.h"
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static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
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const void *buffer,
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uint16_t buflen,
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loff_t object_size);
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struct fscache_netfs afs_cache_netfs = {
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.name = "afs",
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.version = 2,
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};
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struct fscache_cookie_def afs_cell_cache_index_def = {
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.name = "AFS.cell",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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};
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struct fscache_cookie_def afs_volume_cache_index_def = {
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.name = "AFS.volume",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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};
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struct fscache_cookie_def afs_vnode_cache_index_def = {
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.name = "AFS.vnode",
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.type = FSCACHE_COOKIE_TYPE_DATAFILE,
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.check_aux = afs_vnode_cache_check_aux,
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};
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/*
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* check that the auxiliary data indicates that the entry is still valid
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*/
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static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
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const void *buffer,
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uint16_t buflen,
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loff_t object_size)
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{
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struct afs_vnode *vnode = cookie_netfs_data;
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struct afs_vnode_cache_aux aux;
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_enter("{%x,%x,%llx},%p,%u",
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vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
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buffer, buflen);
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memcpy(&aux, buffer, sizeof(aux));
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/* check the size of the data is what we're expecting */
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if (buflen != sizeof(aux)) {
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_leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
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return FSCACHE_CHECKAUX_OBSOLETE;
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}
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if (vnode->status.data_version != aux.data_version) {
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_leave(" = OBSOLETE [vers %llx != %llx]",
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aux.data_version, vnode->status.data_version);
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return FSCACHE_CHECKAUX_OBSOLETE;
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}
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_leave(" = SUCCESS");
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return FSCACHE_CHECKAUX_OKAY;
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}
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