2009-04-03 09:42:42 -06:00
|
|
|
/* NFS FS-Cache index structure definition
|
|
|
|
*
|
|
|
|
* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
|
|
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public Licence
|
|
|
|
* as published by the Free Software Foundation; either version
|
|
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/nfs_fs.h>
|
|
|
|
#include <linux/nfs_fs_sb.h>
|
|
|
|
#include <linux/in6.h>
|
|
|
|
|
|
|
|
#include "internal.h"
|
|
|
|
#include "fscache.h"
|
|
|
|
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_FSCACHE
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Define the NFS filesystem for FS-Cache. Upon registration FS-Cache sticks
|
|
|
|
* the cookie for the top-level index object for NFS into here. The top-level
|
|
|
|
* index can than have other cache objects inserted into it.
|
|
|
|
*/
|
|
|
|
struct fscache_netfs nfs_fscache_netfs = {
|
|
|
|
.name = "nfs",
|
|
|
|
.version = 0,
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Register NFS for caching
|
|
|
|
*/
|
|
|
|
int nfs_fscache_register(void)
|
|
|
|
{
|
|
|
|
return fscache_register_netfs(&nfs_fscache_netfs);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Unregister NFS for caching
|
|
|
|
*/
|
|
|
|
void nfs_fscache_unregister(void)
|
|
|
|
{
|
|
|
|
fscache_unregister_netfs(&nfs_fscache_netfs);
|
|
|
|
}
|
2009-04-03 09:42:42 -06:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Layout of the key for an NFS server cache object.
|
|
|
|
*/
|
|
|
|
struct nfs_server_key {
|
|
|
|
uint16_t nfsversion; /* NFS protocol version */
|
|
|
|
uint16_t family; /* address family */
|
|
|
|
uint16_t port; /* IP port */
|
|
|
|
union {
|
|
|
|
struct in_addr ipv4_addr; /* IPv4 address */
|
|
|
|
struct in6_addr ipv6_addr; /* IPv6 address */
|
|
|
|
} addr[0];
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Generate a key to describe a server in the main NFS index
|
|
|
|
* - We return the length of the key, or 0 if we can't generate one
|
|
|
|
*/
|
|
|
|
static uint16_t nfs_server_get_key(const void *cookie_netfs_data,
|
|
|
|
void *buffer, uint16_t bufmax)
|
|
|
|
{
|
|
|
|
const struct nfs_client *clp = cookie_netfs_data;
|
|
|
|
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) &clp->cl_addr;
|
|
|
|
const struct sockaddr_in *sin = (struct sockaddr_in *) &clp->cl_addr;
|
|
|
|
struct nfs_server_key *key = buffer;
|
|
|
|
uint16_t len = sizeof(struct nfs_server_key);
|
|
|
|
|
|
|
|
key->nfsversion = clp->rpc_ops->version;
|
|
|
|
key->family = clp->cl_addr.ss_family;
|
|
|
|
|
|
|
|
memset(key, 0, len);
|
|
|
|
|
|
|
|
switch (clp->cl_addr.ss_family) {
|
|
|
|
case AF_INET:
|
|
|
|
key->port = sin->sin_port;
|
|
|
|
key->addr[0].ipv4_addr = sin->sin_addr;
|
|
|
|
len += sizeof(key->addr[0].ipv4_addr);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case AF_INET6:
|
|
|
|
key->port = sin6->sin6_port;
|
|
|
|
key->addr[0].ipv6_addr = sin6->sin6_addr;
|
|
|
|
len += sizeof(key->addr[0].ipv6_addr);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
printk(KERN_WARNING "NFS: Unknown network family '%d'\n",
|
|
|
|
clp->cl_addr.ss_family);
|
|
|
|
len = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Define the server object for FS-Cache. This is used to describe a server
|
|
|
|
* object to fscache_acquire_cookie(). It is keyed by the NFS protocol and
|
|
|
|
* server address parameters.
|
|
|
|
*/
|
|
|
|
const struct fscache_cookie_def nfs_fscache_server_index_def = {
|
|
|
|
.name = "NFS.server",
|
|
|
|
.type = FSCACHE_COOKIE_TYPE_INDEX,
|
|
|
|
.get_key = nfs_server_get_key,
|
|
|
|
};
|