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TOMOYO Linux Cross Reference
Linux/fs/afs/cache.c

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  1 /* AFS caching stuff
  2  *
  3  * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/sched.h>
 13 #include "internal.h"
 14 
 15 static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
 16                                                        const void *buffer,
 17                                                        uint16_t buflen,
 18                                                        loff_t object_size);
 19 
 20 struct fscache_netfs afs_cache_netfs = {
 21         .name                   = "afs",
 22         .version                = 2,
 23 };
 24 
 25 struct fscache_cookie_def afs_cell_cache_index_def = {
 26         .name           = "AFS.cell",
 27         .type           = FSCACHE_COOKIE_TYPE_INDEX,
 28 };
 29 
 30 struct fscache_cookie_def afs_volume_cache_index_def = {
 31         .name           = "AFS.volume",
 32         .type           = FSCACHE_COOKIE_TYPE_INDEX,
 33 };
 34 
 35 struct fscache_cookie_def afs_vnode_cache_index_def = {
 36         .name           = "AFS.vnode",
 37         .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
 38         .check_aux      = afs_vnode_cache_check_aux,
 39 };
 40 
 41 /*
 42  * check that the auxiliary data indicates that the entry is still valid
 43  */
 44 static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
 45                                                        const void *buffer,
 46                                                        uint16_t buflen,
 47                                                        loff_t object_size)
 48 {
 49         struct afs_vnode *vnode = cookie_netfs_data;
 50         struct afs_vnode_cache_aux aux;
 51 
 52         _enter("{%llx,%x,%llx},%p,%u",
 53                vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
 54                buffer, buflen);
 55 
 56         memcpy(&aux, buffer, sizeof(aux));
 57 
 58         /* check the size of the data is what we're expecting */
 59         if (buflen != sizeof(aux)) {
 60                 _leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
 61                 return FSCACHE_CHECKAUX_OBSOLETE;
 62         }
 63 
 64         if (vnode->status.data_version != aux.data_version) {
 65                 _leave(" = OBSOLETE [vers %llx != %llx]",
 66                        aux.data_version, vnode->status.data_version);
 67                 return FSCACHE_CHECKAUX_OBSOLETE;
 68         }
 69 
 70         _leave(" = SUCCESS");
 71         return FSCACHE_CHECKAUX_OKAY;
 72 }
 73 

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