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488f1d2d6c
Define server-level cache index objects (as managed by TCP_ServerInfo structs)
and register then with FS-Cache. Each server object is created in the CIFS
top-level index object and is itself an index into which superblock-level
objects are inserted.
The server objects are now keyed by {IPaddress,family,port} tuple.
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>
109 lines
2.9 KiB
C
109 lines
2.9 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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* Key layout of CIFS server cache index object
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*/
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struct cifs_server_key {
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uint16_t family; /* address family */
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uint16_t port; /* IP port */
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union {
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struct in_addr ipv4_addr;
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struct in6_addr ipv6_addr;
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} addr[0];
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};
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/*
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* Server object keyed by {IPaddress,port,family} tuple
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*/
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static uint16_t cifs_server_get_key(const void *cookie_netfs_data,
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void *buffer, uint16_t maxbuf)
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{
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const struct TCP_Server_Info *server = cookie_netfs_data;
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const struct sockaddr *sa = (struct sockaddr *) &server->addr.sockAddr;
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struct cifs_server_key *key = buffer;
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uint16_t key_len = sizeof(struct cifs_server_key);
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memset(key, 0, key_len);
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/*
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* Should not be a problem as sin_family/sin6_family overlays
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* sa_family field
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*/
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switch (sa->sa_family) {
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case AF_INET:
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key->family = server->addr.sockAddr.sin_family;
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key->port = server->addr.sockAddr.sin_port;
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key->addr[0].ipv4_addr = server->addr.sockAddr.sin_addr;
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key_len += sizeof(key->addr[0].ipv4_addr);
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break;
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case AF_INET6:
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key->family = server->addr.sockAddr6.sin6_family;
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key->port = server->addr.sockAddr6.sin6_port;
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key->addr[0].ipv6_addr = server->addr.sockAddr6.sin6_addr;
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key_len += sizeof(key->addr[0].ipv6_addr);
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break;
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default:
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cERROR(1, "CIFS: Unknown network family '%d'", sa->sa_family);
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key_len = 0;
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break;
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}
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return key_len;
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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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.get_key = cifs_server_get_key,
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};
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