1// SPDX-License-Identifier: LGPL-2.1
  2/*
  3 *   fs/cifs/cache.c - 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 */
 15struct fscache_netfs cifs_fscache_netfs = {
 16	.name = "cifs",
 17	.version = 0,
 18};
 19
 20/*
 21 * Register CIFS for caching with FS-Cache
 22 */
 23int cifs_fscache_register(void)
 24{
 25	return fscache_register_netfs(&cifs_fscache_netfs);
 26}
 27
 28/*
 29 * Unregister CIFS for caching
 30 */
 31void cifs_fscache_unregister(void)
 32{
 33	fscache_unregister_netfs(&cifs_fscache_netfs);
 34}
 35
 36/*
 37 * Server object for FS-Cache
 38 */
 39const struct fscache_cookie_def cifs_fscache_server_index_def = {
 40	.name = "CIFS.server",
 41	.type = FSCACHE_COOKIE_TYPE_INDEX,
 42};
 43
 44static enum
 45fscache_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 */
 70const 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
 76static enum
 77fscache_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
101const 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};