mirror of https://gitee.com/openkylin/linux.git
145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* fs/cifs/cache.c - CIFS filesystem cache index structure definitions
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*
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* Copyright (c) 2010 Novell, Inc.
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* Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "fscache.h"
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#include "cifs_debug.h"
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/*
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* CIFS filesystem definition for FS-Cache
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*/
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struct fscache_netfs cifs_fscache_netfs = {
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.name = "cifs",
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.version = 0,
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};
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/*
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* Register CIFS for caching with FS-Cache
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*/
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int cifs_fscache_register(void)
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{
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return fscache_register_netfs(&cifs_fscache_netfs);
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}
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/*
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* Unregister CIFS for caching
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*/
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void cifs_fscache_unregister(void)
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{
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fscache_unregister_netfs(&cifs_fscache_netfs);
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}
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/*
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* Server object for FS-Cache
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*/
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const struct fscache_cookie_def cifs_fscache_server_index_def = {
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.name = "CIFS.server",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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};
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/*
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* Auxiliary data attached to CIFS superblock within the cache
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*/
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struct cifs_fscache_super_auxdata {
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u64 resource_id; /* unique server resource id */
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};
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char *extract_sharename(const char *treename)
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{
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const char *src;
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char *delim, *dst;
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int len;
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/* skip double chars at the beginning */
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src = treename + 2;
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/* share name is always preceded by '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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delim++;
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len = strlen(delim);
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/* caller has to free the memory */
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dst = kstrndup(delim, len, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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return dst;
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}
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static enum
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fscache_checkaux cifs_fscache_super_check_aux(void *cookie_netfs_data,
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const void *data,
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uint16_t datalen,
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loff_t object_size)
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{
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struct cifs_fscache_super_auxdata auxdata;
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const struct cifs_tcon *tcon = cookie_netfs_data;
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if (datalen != sizeof(auxdata))
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return FSCACHE_CHECKAUX_OBSOLETE;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.resource_id = tcon->resource_id;
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if (memcmp(data, &auxdata, datalen) != 0)
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return FSCACHE_CHECKAUX_OBSOLETE;
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return FSCACHE_CHECKAUX_OKAY;
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}
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/*
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* Superblock object for FS-Cache
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*/
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const struct fscache_cookie_def cifs_fscache_super_index_def = {
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.name = "CIFS.super",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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.check_aux = cifs_fscache_super_check_aux,
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};
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static enum
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fscache_checkaux cifs_fscache_inode_check_aux(void *cookie_netfs_data,
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const void *data,
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uint16_t datalen,
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loff_t object_size)
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{
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struct cifs_fscache_inode_auxdata auxdata;
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struct cifsInodeInfo *cifsi = cookie_netfs_data;
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if (datalen != sizeof(auxdata))
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return FSCACHE_CHECKAUX_OBSOLETE;
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memset(&auxdata, 0, sizeof(auxdata));
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auxdata.eof = cifsi->server_eof;
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auxdata.last_write_time = timespec64_to_timespec(cifsi->vfs_inode.i_mtime);
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auxdata.last_change_time = timespec64_to_timespec(cifsi->vfs_inode.i_ctime);
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if (memcmp(data, &auxdata, datalen) != 0)
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return FSCACHE_CHECKAUX_OBSOLETE;
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return FSCACHE_CHECKAUX_OKAY;
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}
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const struct fscache_cookie_def cifs_fscache_inode_object_def = {
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.name = "CIFS.uniqueid",
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.type = FSCACHE_COOKIE_TYPE_DATAFILE,
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.check_aux = cifs_fscache_inode_check_aux,
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};
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