// SPDX-License-Identifier: GPL-2.0-or-later

  /* AFS caching stuff
   *

   * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.

   * Written by David Howells (dhowells@redhat.com)

   */

  #include <linux/sched.h>
  #include "internal.h"

  static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
  						       const void *buffer,

  						       uint16_t buflen,
  						       loff_t object_size);

  
  struct fscache_netfs afs_cache_netfs = {
  	.name			= "afs",

  	.version		= 2,

  };
  
  struct fscache_cookie_def afs_cell_cache_index_def = {
  	.name		= "AFS.cell",
  	.type		= FSCACHE_COOKIE_TYPE_INDEX,

  };
  
  struct fscache_cookie_def afs_volume_cache_index_def = {
  	.name		= "AFS.volume",
  	.type		= FSCACHE_COOKIE_TYPE_INDEX,

  };
  
  struct fscache_cookie_def afs_vnode_cache_index_def = {

  	.name		= "AFS.vnode",
  	.type		= FSCACHE_COOKIE_TYPE_DATAFILE,

  	.check_aux	= afs_vnode_cache_check_aux,

  };

  
  /*

   * check that the auxiliary data indicates that the entry is still valid

   */

  static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
  						       const void *buffer,

  						       uint16_t buflen,
  						       loff_t object_size)

  {

  	struct afs_vnode *vnode = cookie_netfs_data;

  	struct afs_vnode_cache_aux aux;

  	_enter("{%llx,%x,%llx},%p,%u",

  	       vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
  	       buffer, buflen);

  	memcpy(&aux, buffer, sizeof(aux));

  	/* check the size of the data is what we're expecting */

  	if (buflen != sizeof(aux)) {
  		_leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));

  		return FSCACHE_CHECKAUX_OBSOLETE;

  	}

  	if (vnode->status.data_version != aux.data_version) {

  		_leave(" = OBSOLETE [vers %llx != %llx]",

  		       aux.data_version, vnode->status.data_version);

  		return FSCACHE_CHECKAUX_OBSOLETE;

  	}
  
  	_leave(" = SUCCESS");

  	return FSCACHE_CHECKAUX_OKAY;

  }