#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_MAX 64
#define NLM_HOST_NRHASH 32
#define NLM_ADDRHASH(addr) (ntohl(addr) & (NLM_HOST_NRHASH-1))
#define NLM_HOST_REBIND (60 * HZ)
-#define NLM_HOST_EXPIRE ((nrhosts > NLM_HOST_MAX)? 300 * HZ : 120 * HZ)
-#define NLM_HOST_COLLECT ((nrhosts > NLM_HOST_MAX)? 120 * HZ : 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;
const char *hostname,
unsigned int hostname_len);
+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(int server, const struct sockaddr_in *sin,
- int proto, int version, const char *hostname,
- unsigned int hostname_len,
- const struct sockaddr_in *ssin)
+static struct nlm_host *nlm_lookup_host(int server,
+ const struct sockaddr_in *sin,
+ int proto, u32 version,
+ const char *hostname,
+ unsigned int hostname_len,
+ const struct sockaddr_in *ssin)
{
struct hlist_head *chain;
struct hlist_node *pos;
struct nsm_handle *nsm = NULL;
int hash;
- dprintk("lockd: nlm_lookup_host("NIPQUAD_FMT"->"NIPQUAD_FMT
- ", p=%d, v=%d, my role=%s, name=%.*s)\n",
- NIPQUAD(ssin->sin_addr.s_addr),
- NIPQUAD(sin->sin_addr.s_addr), proto, version,
- server? "server" : "client",
- hostname_len,
- hostname? hostname : "<none>");
-
+ dprintk("lockd: nlm_lookup_host(proto=%d, vers=%u,"
+ " my role is %s, hostname=%.*s)\n",
+ proto, version, server ? "server" : "client",
+ hostname_len, hostname ? hostname : "<none>");
hash = NLM_ADDRHASH(sin->sin_addr.s_addr);
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;
}
- if (nsm)
- atomic_inc(&nsm->sm_count);
- host = NULL;
-
- /* Sadly, the host isn't in our hash table yet. See if
- * we have an NSM handle for it. If not, create one.
+ /*
+ * The host wasn't in our hash table. If we don't
+ * have an NSM handle for it yet, create one.
*/
- if (!nsm && !(nsm = nsm_find(sin, hostname, hostname_len)))
- goto out;
+ if (nsm)
+ atomic_inc(&nsm->sm_count);
+ else {
+ host = NULL;
+ nsm = nsm_find(sin, hostname, hostname_len);
+ 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;
INIT_LIST_HEAD(&host->h_granted);
INIT_LIST_HEAD(&host->h_reclaim);
- if (++nrhosts > NLM_HOST_MAX)
- next_gc = 0;
+ nrhosts++;
+
+ nlm_display_address((struct sockaddr *)&host->h_addr,
+ host->h_addrbuf, sizeof(host->h_addrbuf));
+ nlm_display_address((struct sockaddr *)&host->h_saddr,
+ host->h_saddrbuf, sizeof(host->h_saddrbuf));
+
+ dprintk("lockd: nlm_lookup_host created host %s\n",
+ host->h_name);
out:
mutex_unlock(&nlm_host_mutex);
/*
* Find an NLM server handle in the cache. If there is none, create it.
*/
-struct nlm_host *
-nlmclnt_lookup_host(const struct sockaddr_in *sin, int proto, int version,
- const char *hostname, unsigned int hostname_len)
+struct nlm_host *nlmclnt_lookup_host(const struct sockaddr_in *sin,
+ int proto, u32 version,
+ const char *hostname,
+ unsigned int hostname_len)
{
- struct sockaddr_in ssin = {0};
+ const struct sockaddr_in source = {
+ .sin_family = AF_UNSPEC,
+ };
return nlm_lookup_host(0, sin, proto, version,
- hostname, hostname_len, &ssin);
+ hostname, hostname_len, &source);
}
/*
nlmsvc_lookup_host(struct svc_rqst *rqstp,
const char *hostname, unsigned int hostname_len)
{
- struct sockaddr_in ssin = {0};
+ const struct sockaddr_in source = {
+ .sin_family = AF_INET,
+ .sin_addr = rqstp->rq_daddr.addr,
+ };
- ssin.sin_addr = rqstp->rq_daddr.addr;
return nlm_lookup_host(1, svc_addr_in(rqstp),
rqstp->rq_prot, rqstp->rq_vers,
- hostname, hostname_len, &ssin);
+ hostname, hostname_len, &source);
}
/*
{
struct rpc_clnt *clnt;
- dprintk("lockd: nlm_bind_host("NIPQUAD_FMT"->"NIPQUAD_FMT")\n",
- NIPQUAD(host->h_saddr.sin_addr),
- NIPQUAD(host->h_addr.sin_addr));
+ dprintk("lockd: nlm_bind_host %s (%s), my addr=%s\n",
+ host->h_name, host->h_addrbuf, host->h_saddrbuf);
/* Lock host handle */
mutex_lock(&host->h_mutex);
if (time_after_eq(jiffies, host->h_nextrebind)) {
rpc_force_rebind(clnt);
host->h_nextrebind = jiffies + NLM_HOST_REBIND;
- dprintk("lockd: next rebind in %ld jiffies\n",
+ dprintk("lockd: next rebind in %lu jiffies\n",
host->h_nextrebind - jiffies);
}
} else {
struct nsm_handle *nsm;
struct nlm_host *host;
- dprintk("lockd: nlm_host_rebooted(%s, %u.%u.%u.%u)\n",
- hostname, NIPQUAD(sin->sin_addr));
-
/* Find the NSM handle for this peer */
- if (!(nsm = __nsm_find(sin, hostname, hostname_len, 0)))
+ nsm = __nsm_find(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 */
* Manage NSM handles
*/
static LIST_HEAD(nsm_handles);
-static DEFINE_MUTEX(nsm_mutex);
+static DEFINE_SPINLOCK(nsm_lock);
static struct nsm_handle *
__nsm_find(const struct sockaddr_in *sin,
int create)
{
struct nsm_handle *nsm = NULL;
- struct list_head *pos;
+ struct nsm_handle *pos;
if (!sin)
return NULL;
return NULL;
}
- mutex_lock(&nsm_mutex);
- list_for_each(pos, &nsm_handles) {
- nsm = list_entry(pos, struct nsm_handle, sm_link);
+retry:
+ spin_lock(&nsm_lock);
+ list_for_each_entry(pos, &nsm_handles, sm_link) {
if (hostname && nsm_use_hostnames) {
- if (strlen(nsm->sm_name) != hostname_len
- || memcmp(nsm->sm_name, hostname, hostname_len))
+ if (strlen(pos->sm_name) != hostname_len
+ || memcmp(pos->sm_name, hostname, hostname_len))
continue;
- } else if (!nlm_cmp_addr(&nsm->sm_addr, sin))
+ } else if (!nlm_cmp_addr(&pos->sm_addr, sin))
continue;
- atomic_inc(&nsm->sm_count);
- goto out;
+ atomic_inc(&pos->sm_count);
+ kfree(nsm);
+ nsm = pos;
+ goto found;
}
-
- if (!create) {
- nsm = NULL;
- goto out;
+ if (nsm) {
+ list_add(&nsm->sm_link, &nsm_handles);
+ goto found;
}
+ spin_unlock(&nsm_lock);
- nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
- if (nsm != NULL) {
- nsm->sm_addr = *sin;
- nsm->sm_name = (char *) (nsm + 1);
- memcpy(nsm->sm_name, hostname, hostname_len);
- nsm->sm_name[hostname_len] = '\0';
- atomic_set(&nsm->sm_count, 1);
+ if (!create)
+ return NULL;
- list_add(&nsm->sm_link, &nsm_handles);
- }
+ nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
+ if (nsm == NULL)
+ return NULL;
-out:
- mutex_unlock(&nsm_mutex);
+ nsm->sm_addr = *sin;
+ 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;
}
{
if (!nsm)
return;
- if (atomic_dec_and_test(&nsm->sm_count)) {
- mutex_lock(&nsm_mutex);
- if (atomic_read(&nsm->sm_count) == 0) {
- list_del(&nsm->sm_link);
- kfree(nsm);
- }
- mutex_unlock(&nsm_mutex);
+ if (atomic_dec_and_lock(&nsm->sm_count, &nsm_lock)) {
+ list_del(&nsm->sm_link);
+ spin_unlock(&nsm_lock);
+ kfree(nsm);
}
}
projects / linux-2.6-omap-h63xx.git / blobdiff