mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 09:59:32 +00:00
![Chuck Lever](/assets/img/avatar_default.png)
Fix up nlmsvc_lookup_host() to pass AF_INET6 source addresses to nlm_lookup_host(). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
708 lines
18 KiB
C
708 lines
18 KiB
C
/*
|
|
* linux/fs/lockd/host.c
|
|
*
|
|
* Management for NLM peer hosts. The nlm_host struct is shared
|
|
* between client and server implementation. The only reason to
|
|
* do so is to reduce code bloat.
|
|
*
|
|
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/in.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/lockd/lockd.h>
|
|
#include <linux/lockd/sm_inter.h>
|
|
#include <linux/mutex.h>
|
|
|
|
#include <net/ipv6.h>
|
|
|
|
#define NLMDBG_FACILITY NLMDBG_HOSTCACHE
|
|
#define NLM_HOST_NRHASH 32
|
|
#define NLM_HOST_REBIND (60 * HZ)
|
|
#define NLM_HOST_EXPIRE (300 * HZ)
|
|
#define NLM_HOST_COLLECT (120 * HZ)
|
|
|
|
static struct hlist_head nlm_hosts[NLM_HOST_NRHASH];
|
|
static unsigned long next_gc;
|
|
static int nrhosts;
|
|
static DEFINE_MUTEX(nlm_host_mutex);
|
|
|
|
static void nlm_gc_hosts(void);
|
|
static struct nsm_handle *nsm_find(const struct sockaddr *sap,
|
|
const size_t salen,
|
|
const char *hostname,
|
|
const size_t hostname_len,
|
|
const int create);
|
|
|
|
struct nlm_lookup_host_info {
|
|
const int server; /* search for server|client */
|
|
const struct sockaddr *sap; /* address to search for */
|
|
const size_t salen; /* it's length */
|
|
const unsigned short protocol; /* transport to search for*/
|
|
const u32 version; /* NLM version to search for */
|
|
const char *hostname; /* remote's hostname */
|
|
const size_t hostname_len; /* it's length */
|
|
const struct sockaddr *src_sap; /* our address (optional) */
|
|
const size_t src_len; /* it's length */
|
|
};
|
|
|
|
/*
|
|
* Hash function must work well on big- and little-endian platforms
|
|
*/
|
|
static unsigned int __nlm_hash32(const __be32 n)
|
|
{
|
|
unsigned int hash = (__force u32)n ^ ((__force u32)n >> 16);
|
|
return hash ^ (hash >> 8);
|
|
}
|
|
|
|
static unsigned int __nlm_hash_addr4(const struct sockaddr *sap)
|
|
{
|
|
const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
|
|
return __nlm_hash32(sin->sin_addr.s_addr);
|
|
}
|
|
|
|
static unsigned int __nlm_hash_addr6(const struct sockaddr *sap)
|
|
{
|
|
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
|
|
const struct in6_addr addr = sin6->sin6_addr;
|
|
return __nlm_hash32(addr.s6_addr32[0]) ^
|
|
__nlm_hash32(addr.s6_addr32[1]) ^
|
|
__nlm_hash32(addr.s6_addr32[2]) ^
|
|
__nlm_hash32(addr.s6_addr32[3]);
|
|
}
|
|
|
|
static unsigned int nlm_hash_address(const struct sockaddr *sap)
|
|
{
|
|
unsigned int hash;
|
|
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
hash = __nlm_hash_addr4(sap);
|
|
break;
|
|
case AF_INET6:
|
|
hash = __nlm_hash_addr6(sap);
|
|
break;
|
|
default:
|
|
hash = 0;
|
|
}
|
|
return hash & (NLM_HOST_NRHASH - 1);
|
|
}
|
|
|
|
static void nlm_clear_port(struct sockaddr *sap)
|
|
{
|
|
switch (sap->sa_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)sap)->sin_port = 0;
|
|
break;
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)sap)->sin6_port = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void nlm_display_address(const struct sockaddr *sap,
|
|
char *buf, const size_t len)
|
|
{
|
|
const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
|
|
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
|
|
|
|
switch (sap->sa_family) {
|
|
case AF_UNSPEC:
|
|
snprintf(buf, len, "unspecified");
|
|
break;
|
|
case AF_INET:
|
|
snprintf(buf, len, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
|
|
break;
|
|
case AF_INET6:
|
|
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
|
|
snprintf(buf, len, NIPQUAD_FMT,
|
|
NIPQUAD(sin6->sin6_addr.s6_addr32[3]));
|
|
else
|
|
snprintf(buf, len, NIP6_FMT, NIP6(sin6->sin6_addr));
|
|
break;
|
|
default:
|
|
snprintf(buf, len, "unsupported address family");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Common host lookup routine for server & client
|
|
*/
|
|
static struct nlm_host *nlm_lookup_host(struct nlm_lookup_host_info *ni)
|
|
{
|
|
struct hlist_head *chain;
|
|
struct hlist_node *pos;
|
|
struct nlm_host *host;
|
|
struct nsm_handle *nsm = NULL;
|
|
|
|
mutex_lock(&nlm_host_mutex);
|
|
|
|
if (time_after_eq(jiffies, next_gc))
|
|
nlm_gc_hosts();
|
|
|
|
/* We may keep several nlm_host objects for a peer, because each
|
|
* nlm_host is identified by
|
|
* (address, protocol, version, server/client)
|
|
* We could probably simplify this a little by putting all those
|
|
* different NLM rpc_clients into one single nlm_host object.
|
|
* This would allow us to have one nlm_host per address.
|
|
*/
|
|
chain = &nlm_hosts[nlm_hash_address(ni->sap)];
|
|
hlist_for_each_entry(host, pos, chain, h_hash) {
|
|
if (!nlm_cmp_addr(nlm_addr(host), ni->sap))
|
|
continue;
|
|
|
|
/* See if we have an NSM handle for this client */
|
|
if (!nsm)
|
|
nsm = host->h_nsmhandle;
|
|
|
|
if (host->h_proto != ni->protocol)
|
|
continue;
|
|
if (host->h_version != ni->version)
|
|
continue;
|
|
if (host->h_server != ni->server)
|
|
continue;
|
|
if (!nlm_cmp_addr(nlm_srcaddr(host), ni->src_sap))
|
|
continue;
|
|
|
|
/* Move to head of hash chain. */
|
|
hlist_del(&host->h_hash);
|
|
hlist_add_head(&host->h_hash, chain);
|
|
|
|
nlm_get_host(host);
|
|
dprintk("lockd: nlm_lookup_host found host %s (%s)\n",
|
|
host->h_name, host->h_addrbuf);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The host wasn't in our hash table. If we don't
|
|
* have an NSM handle for it yet, create one.
|
|
*/
|
|
if (nsm)
|
|
atomic_inc(&nsm->sm_count);
|
|
else {
|
|
host = NULL;
|
|
nsm = nsm_find(ni->sap, ni->salen,
|
|
ni->hostname, ni->hostname_len, 1);
|
|
if (!nsm) {
|
|
dprintk("lockd: nlm_lookup_host failed; "
|
|
"no nsm handle\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
host = kzalloc(sizeof(*host), GFP_KERNEL);
|
|
if (!host) {
|
|
nsm_release(nsm);
|
|
dprintk("lockd: nlm_lookup_host failed; no memory\n");
|
|
goto out;
|
|
}
|
|
host->h_name = nsm->sm_name;
|
|
memcpy(nlm_addr(host), ni->sap, ni->salen);
|
|
host->h_addrlen = ni->salen;
|
|
nlm_clear_port(nlm_addr(host));
|
|
memcpy(nlm_srcaddr(host), ni->src_sap, ni->src_len);
|
|
host->h_version = ni->version;
|
|
host->h_proto = ni->protocol;
|
|
host->h_rpcclnt = NULL;
|
|
mutex_init(&host->h_mutex);
|
|
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
|
|
host->h_expires = jiffies + NLM_HOST_EXPIRE;
|
|
atomic_set(&host->h_count, 1);
|
|
init_waitqueue_head(&host->h_gracewait);
|
|
init_rwsem(&host->h_rwsem);
|
|
host->h_state = 0; /* pseudo NSM state */
|
|
host->h_nsmstate = 0; /* real NSM state */
|
|
host->h_nsmhandle = nsm;
|
|
host->h_server = ni->server;
|
|
hlist_add_head(&host->h_hash, chain);
|
|
INIT_LIST_HEAD(&host->h_lockowners);
|
|
spin_lock_init(&host->h_lock);
|
|
INIT_LIST_HEAD(&host->h_granted);
|
|
INIT_LIST_HEAD(&host->h_reclaim);
|
|
|
|
nrhosts++;
|
|
|
|
nlm_display_address((struct sockaddr *)&host->h_addr,
|
|
host->h_addrbuf, sizeof(host->h_addrbuf));
|
|
nlm_display_address((struct sockaddr *)&host->h_srcaddr,
|
|
host->h_srcaddrbuf, sizeof(host->h_srcaddrbuf));
|
|
|
|
dprintk("lockd: nlm_lookup_host created host %s\n",
|
|
host->h_name);
|
|
|
|
out:
|
|
mutex_unlock(&nlm_host_mutex);
|
|
return host;
|
|
}
|
|
|
|
/*
|
|
* Destroy a host
|
|
*/
|
|
static void
|
|
nlm_destroy_host(struct nlm_host *host)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
|
|
BUG_ON(!list_empty(&host->h_lockowners));
|
|
BUG_ON(atomic_read(&host->h_count));
|
|
|
|
/*
|
|
* Release NSM handle and unmonitor host.
|
|
*/
|
|
nsm_unmonitor(host);
|
|
|
|
clnt = host->h_rpcclnt;
|
|
if (clnt != NULL)
|
|
rpc_shutdown_client(clnt);
|
|
kfree(host);
|
|
}
|
|
|
|
/**
|
|
* nlmclnt_lookup_host - Find an NLM host handle matching a remote server
|
|
* @sap: network address of server
|
|
* @salen: length of server address
|
|
* @protocol: transport protocol to use
|
|
* @version: NLM protocol version
|
|
* @hostname: '\0'-terminated hostname of server
|
|
*
|
|
* Returns an nlm_host structure that matches the passed-in
|
|
* [server address, transport protocol, NLM version, server hostname].
|
|
* If one doesn't already exist in the host cache, a new handle is
|
|
* created and returned.
|
|
*/
|
|
struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
|
|
const size_t salen,
|
|
const unsigned short protocol,
|
|
const u32 version, const char *hostname)
|
|
{
|
|
const struct sockaddr source = {
|
|
.sa_family = AF_UNSPEC,
|
|
};
|
|
struct nlm_lookup_host_info ni = {
|
|
.server = 0,
|
|
.sap = sap,
|
|
.salen = salen,
|
|
.protocol = protocol,
|
|
.version = version,
|
|
.hostname = hostname,
|
|
.hostname_len = strlen(hostname),
|
|
.src_sap = &source,
|
|
.src_len = sizeof(source),
|
|
};
|
|
|
|
dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
|
|
(hostname ? hostname : "<none>"), version,
|
|
(protocol == IPPROTO_UDP ? "udp" : "tcp"));
|
|
|
|
return nlm_lookup_host(&ni);
|
|
}
|
|
|
|
/**
|
|
* nlmsvc_lookup_host - Find an NLM host handle matching a remote client
|
|
* @rqstp: incoming NLM request
|
|
* @hostname: name of client host
|
|
* @hostname_len: length of client hostname
|
|
*
|
|
* Returns an nlm_host structure that matches the [client address,
|
|
* transport protocol, NLM version, client hostname] of the passed-in
|
|
* NLM request. If one doesn't already exist in the host cache, a
|
|
* new handle is created and returned.
|
|
*
|
|
* Before possibly creating a new nlm_host, construct a sockaddr
|
|
* for a specific source address in case the local system has
|
|
* multiple network addresses. The family of the address in
|
|
* rq_daddr is guaranteed to be the same as the family of the
|
|
* address in rq_addr, so it's safe to use the same family for
|
|
* the source address.
|
|
*/
|
|
struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
|
|
const char *hostname,
|
|
const size_t hostname_len)
|
|
{
|
|
struct sockaddr_in sin = {
|
|
.sin_family = AF_INET,
|
|
};
|
|
struct sockaddr_in6 sin6 = {
|
|
.sin6_family = AF_INET6,
|
|
};
|
|
struct nlm_lookup_host_info ni = {
|
|
.server = 1,
|
|
.sap = svc_addr(rqstp),
|
|
.salen = rqstp->rq_addrlen,
|
|
.protocol = rqstp->rq_prot,
|
|
.version = rqstp->rq_vers,
|
|
.hostname = hostname,
|
|
.hostname_len = hostname_len,
|
|
.src_len = rqstp->rq_addrlen,
|
|
};
|
|
|
|
dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
|
|
(int)hostname_len, hostname, rqstp->rq_vers,
|
|
(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
|
|
|
|
switch (ni.sap->sa_family) {
|
|
case AF_INET:
|
|
sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
|
|
ni.src_sap = (struct sockaddr *)&sin;
|
|
break;
|
|
case AF_INET6:
|
|
ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
|
|
ni.src_sap = (struct sockaddr *)&sin6;
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return nlm_lookup_host(&ni);
|
|
}
|
|
|
|
/*
|
|
* Create the NLM RPC client for an NLM peer
|
|
*/
|
|
struct rpc_clnt *
|
|
nlm_bind_host(struct nlm_host *host)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
|
|
dprintk("lockd: nlm_bind_host %s (%s), my addr=%s\n",
|
|
host->h_name, host->h_addrbuf, host->h_srcaddrbuf);
|
|
|
|
/* Lock host handle */
|
|
mutex_lock(&host->h_mutex);
|
|
|
|
/* If we've already created an RPC client, check whether
|
|
* RPC rebind is required
|
|
*/
|
|
if ((clnt = host->h_rpcclnt) != NULL) {
|
|
if (time_after_eq(jiffies, host->h_nextrebind)) {
|
|
rpc_force_rebind(clnt);
|
|
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
|
|
dprintk("lockd: next rebind in %lu jiffies\n",
|
|
host->h_nextrebind - jiffies);
|
|
}
|
|
} else {
|
|
unsigned long increment = nlmsvc_timeout;
|
|
struct rpc_timeout timeparms = {
|
|
.to_initval = increment,
|
|
.to_increment = increment,
|
|
.to_maxval = increment * 6UL,
|
|
.to_retries = 5U,
|
|
};
|
|
struct rpc_create_args args = {
|
|
.protocol = host->h_proto,
|
|
.address = nlm_addr(host),
|
|
.addrsize = host->h_addrlen,
|
|
.saddress = nlm_srcaddr(host),
|
|
.timeout = &timeparms,
|
|
.servername = host->h_name,
|
|
.program = &nlm_program,
|
|
.version = host->h_version,
|
|
.authflavor = RPC_AUTH_UNIX,
|
|
.flags = (RPC_CLNT_CREATE_NOPING |
|
|
RPC_CLNT_CREATE_AUTOBIND),
|
|
};
|
|
|
|
/*
|
|
* lockd retries server side blocks automatically so we want
|
|
* those to be soft RPC calls. Client side calls need to be
|
|
* hard RPC tasks.
|
|
*/
|
|
if (!host->h_server)
|
|
args.flags |= RPC_CLNT_CREATE_HARDRTRY;
|
|
|
|
clnt = rpc_create(&args);
|
|
if (!IS_ERR(clnt))
|
|
host->h_rpcclnt = clnt;
|
|
else {
|
|
printk("lockd: couldn't create RPC handle for %s\n", host->h_name);
|
|
clnt = NULL;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&host->h_mutex);
|
|
return clnt;
|
|
}
|
|
|
|
/*
|
|
* Force a portmap lookup of the remote lockd port
|
|
*/
|
|
void
|
|
nlm_rebind_host(struct nlm_host *host)
|
|
{
|
|
dprintk("lockd: rebind host %s\n", host->h_name);
|
|
if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
|
|
rpc_force_rebind(host->h_rpcclnt);
|
|
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Increment NLM host count
|
|
*/
|
|
struct nlm_host * nlm_get_host(struct nlm_host *host)
|
|
{
|
|
if (host) {
|
|
dprintk("lockd: get host %s\n", host->h_name);
|
|
atomic_inc(&host->h_count);
|
|
host->h_expires = jiffies + NLM_HOST_EXPIRE;
|
|
}
|
|
return host;
|
|
}
|
|
|
|
/*
|
|
* Release NLM host after use
|
|
*/
|
|
void nlm_release_host(struct nlm_host *host)
|
|
{
|
|
if (host != NULL) {
|
|
dprintk("lockd: release host %s\n", host->h_name);
|
|
BUG_ON(atomic_read(&host->h_count) < 0);
|
|
if (atomic_dec_and_test(&host->h_count)) {
|
|
BUG_ON(!list_empty(&host->h_lockowners));
|
|
BUG_ON(!list_empty(&host->h_granted));
|
|
BUG_ON(!list_empty(&host->h_reclaim));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We were notified that the host indicated by address &sin
|
|
* has rebooted.
|
|
* Release all resources held by that peer.
|
|
*/
|
|
void nlm_host_rebooted(const struct sockaddr_in *sin,
|
|
const char *hostname,
|
|
unsigned int hostname_len,
|
|
u32 new_state)
|
|
{
|
|
struct hlist_head *chain;
|
|
struct hlist_node *pos;
|
|
struct nsm_handle *nsm;
|
|
struct nlm_host *host;
|
|
|
|
nsm = nsm_find((struct sockaddr *)sin, sizeof(*sin),
|
|
hostname, hostname_len, 0);
|
|
if (nsm == NULL) {
|
|
dprintk("lockd: never saw rebooted peer '%.*s' before\n",
|
|
hostname_len, hostname);
|
|
return;
|
|
}
|
|
|
|
dprintk("lockd: nlm_host_rebooted(%.*s, %s)\n",
|
|
hostname_len, hostname, nsm->sm_addrbuf);
|
|
|
|
/* When reclaiming locks on this peer, make sure that
|
|
* we set up a new notification */
|
|
nsm->sm_monitored = 0;
|
|
|
|
/* Mark all hosts tied to this NSM state as having rebooted.
|
|
* We run the loop repeatedly, because we drop the host table
|
|
* lock for this.
|
|
* To avoid processing a host several times, we match the nsmstate.
|
|
*/
|
|
again: mutex_lock(&nlm_host_mutex);
|
|
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
|
|
hlist_for_each_entry(host, pos, chain, h_hash) {
|
|
if (host->h_nsmhandle == nsm
|
|
&& host->h_nsmstate != new_state) {
|
|
host->h_nsmstate = new_state;
|
|
host->h_state++;
|
|
|
|
nlm_get_host(host);
|
|
mutex_unlock(&nlm_host_mutex);
|
|
|
|
if (host->h_server) {
|
|
/* We're server for this guy, just ditch
|
|
* all the locks he held. */
|
|
nlmsvc_free_host_resources(host);
|
|
} else {
|
|
/* He's the server, initiate lock recovery. */
|
|
nlmclnt_recovery(host);
|
|
}
|
|
|
|
nlm_release_host(host);
|
|
goto again;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&nlm_host_mutex);
|
|
}
|
|
|
|
/*
|
|
* Shut down the hosts module.
|
|
* Note that this routine is called only at server shutdown time.
|
|
*/
|
|
void
|
|
nlm_shutdown_hosts(void)
|
|
{
|
|
struct hlist_head *chain;
|
|
struct hlist_node *pos;
|
|
struct nlm_host *host;
|
|
|
|
dprintk("lockd: shutting down host module\n");
|
|
mutex_lock(&nlm_host_mutex);
|
|
|
|
/* First, make all hosts eligible for gc */
|
|
dprintk("lockd: nuking all hosts...\n");
|
|
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
|
|
hlist_for_each_entry(host, pos, chain, h_hash) {
|
|
host->h_expires = jiffies - 1;
|
|
if (host->h_rpcclnt) {
|
|
rpc_shutdown_client(host->h_rpcclnt);
|
|
host->h_rpcclnt = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Then, perform a garbage collection pass */
|
|
nlm_gc_hosts();
|
|
mutex_unlock(&nlm_host_mutex);
|
|
|
|
/* complain if any hosts are left */
|
|
if (nrhosts) {
|
|
printk(KERN_WARNING "lockd: couldn't shutdown host module!\n");
|
|
dprintk("lockd: %d hosts left:\n", nrhosts);
|
|
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
|
|
hlist_for_each_entry(host, pos, chain, h_hash) {
|
|
dprintk(" %s (cnt %d use %d exp %ld)\n",
|
|
host->h_name, atomic_read(&host->h_count),
|
|
host->h_inuse, host->h_expires);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Garbage collect any unused NLM hosts.
|
|
* This GC combines reference counting for async operations with
|
|
* mark & sweep for resources held by remote clients.
|
|
*/
|
|
static void
|
|
nlm_gc_hosts(void)
|
|
{
|
|
struct hlist_head *chain;
|
|
struct hlist_node *pos, *next;
|
|
struct nlm_host *host;
|
|
|
|
dprintk("lockd: host garbage collection\n");
|
|
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
|
|
hlist_for_each_entry(host, pos, chain, h_hash)
|
|
host->h_inuse = 0;
|
|
}
|
|
|
|
/* Mark all hosts that hold locks, blocks or shares */
|
|
nlmsvc_mark_resources();
|
|
|
|
for (chain = nlm_hosts; chain < nlm_hosts + NLM_HOST_NRHASH; ++chain) {
|
|
hlist_for_each_entry_safe(host, pos, next, chain, h_hash) {
|
|
if (atomic_read(&host->h_count) || host->h_inuse
|
|
|| time_before(jiffies, host->h_expires)) {
|
|
dprintk("nlm_gc_hosts skipping %s (cnt %d use %d exp %ld)\n",
|
|
host->h_name, atomic_read(&host->h_count),
|
|
host->h_inuse, host->h_expires);
|
|
continue;
|
|
}
|
|
dprintk("lockd: delete host %s\n", host->h_name);
|
|
hlist_del_init(&host->h_hash);
|
|
|
|
nlm_destroy_host(host);
|
|
nrhosts--;
|
|
}
|
|
}
|
|
|
|
next_gc = jiffies + NLM_HOST_COLLECT;
|
|
}
|
|
|
|
|
|
/*
|
|
* Manage NSM handles
|
|
*/
|
|
static LIST_HEAD(nsm_handles);
|
|
static DEFINE_SPINLOCK(nsm_lock);
|
|
|
|
static struct nsm_handle *nsm_find(const struct sockaddr *sap,
|
|
const size_t salen,
|
|
const char *hostname,
|
|
const size_t hostname_len,
|
|
const int create)
|
|
{
|
|
struct nsm_handle *nsm = NULL;
|
|
struct nsm_handle *pos;
|
|
|
|
if (!sap)
|
|
return NULL;
|
|
|
|
if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
|
|
if (printk_ratelimit()) {
|
|
printk(KERN_WARNING "Invalid hostname \"%.*s\" "
|
|
"in NFS lock request\n",
|
|
(int)hostname_len, hostname);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
retry:
|
|
spin_lock(&nsm_lock);
|
|
list_for_each_entry(pos, &nsm_handles, sm_link) {
|
|
|
|
if (hostname && nsm_use_hostnames) {
|
|
if (strlen(pos->sm_name) != hostname_len
|
|
|| memcmp(pos->sm_name, hostname, hostname_len))
|
|
continue;
|
|
} else if (!nlm_cmp_addr(nsm_addr(pos), sap))
|
|
continue;
|
|
atomic_inc(&pos->sm_count);
|
|
kfree(nsm);
|
|
nsm = pos;
|
|
goto found;
|
|
}
|
|
if (nsm) {
|
|
list_add(&nsm->sm_link, &nsm_handles);
|
|
goto found;
|
|
}
|
|
spin_unlock(&nsm_lock);
|
|
|
|
if (!create)
|
|
return NULL;
|
|
|
|
nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
|
|
if (nsm == NULL)
|
|
return NULL;
|
|
|
|
memcpy(nsm_addr(nsm), sap, salen);
|
|
nsm->sm_addrlen = salen;
|
|
nsm->sm_name = (char *) (nsm + 1);
|
|
memcpy(nsm->sm_name, hostname, hostname_len);
|
|
nsm->sm_name[hostname_len] = '\0';
|
|
nlm_display_address((struct sockaddr *)&nsm->sm_addr,
|
|
nsm->sm_addrbuf, sizeof(nsm->sm_addrbuf));
|
|
atomic_set(&nsm->sm_count, 1);
|
|
goto retry;
|
|
|
|
found:
|
|
spin_unlock(&nsm_lock);
|
|
return nsm;
|
|
}
|
|
|
|
/*
|
|
* Release an NSM handle
|
|
*/
|
|
void
|
|
nsm_release(struct nsm_handle *nsm)
|
|
{
|
|
if (!nsm)
|
|
return;
|
|
if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
|
|
list_del(&nsm->sm_link);
|
|
spin_unlock(&nsm_lock);
|
|
kfree(nsm);
|
|
}
|
|
}
|