Clean up.
Change nlmsvc_lookup_host() to be purpose-built for server-side
nlm_host management. This replaces the generic nlm_lookup_host()
helper function, just like on the client side. The lookup logic is
specialized for server host lookups.
The server side cache also gets its own specialized nlm_release_host()
function.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/lockd/host.c | 91 ++++++++++++++++++++++++++++++++++---------
fs/lockd/svc4proc.c | 16 ++++----
fs/lockd/svcproc.c | 18 ++++-----
include/linux/lockd/lockd.h | 2 -
4 files changed, 90 insertions(+), 37 deletions(-)
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 3aa2497..09286e2 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -379,6 +379,10 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
const char *hostname,
const size_t hostname_len)
{
+ struct hlist_head *chain;
+ struct hlist_node *pos;
+ struct nlm_host *host = NULL;
+ struct nsm_handle *nsm = NULL;
struct sockaddr_in sin = {
.sin_family = AF_INET,
};
@@ -400,6 +404,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
(int)hostname_len, hostname, rqstp->rq_vers,
(rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
+ mutex_lock(&nlm_host_mutex);
+
switch (ni.sap->sa_family) {
case AF_INET:
sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
@@ -410,10 +416,73 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
ni.src_sap = (struct sockaddr *)&sin6;
break;
default:
- return NULL;
+ dprintk("lockd: %s failed; unrecognized address family\n",
+ __func__);
+ goto out;
}
- return nlm_lookup_host(&ni);
+ if (time_after_eq(jiffies, next_gc))
+ nlm_gc_hosts();
+
+ chain = &nlm_hosts[nlm_hash_address(ni.sap)];
+ hlist_for_each_entry(host, pos, chain, h_hash) {
+ if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
+ continue;
+
+ /* Same address. Share an NSM handle if we already have one */
+ if (nsm == NULL)
+ nsm = host->h_nsmhandle;
+
+ if (host->h_proto != ni.protocol)
+ continue;
+ if (host->h_version != ni.version)
+ continue;
+ if (!rpc_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: %s found host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+ goto out;
+ }
+
+ host = nlm_alloc_host(&ni, nsm);
+ if (unlikely(host == NULL))
+ goto out;
+
+ memcpy(nlm_srcaddr(host), ni.src_sap, ni.src_len);
+ host->h_srcaddrlen = ni.src_len;
+ hlist_add_head(&host->h_hash, chain);
+ nrhosts++;
+
+ dprintk("lockd: %s created host %s (%s)\n",
+ __func__, host->h_name, host->h_addrbuf);
+
+out:
+ mutex_unlock(&nlm_host_mutex);
+ return host;
+}
+
+/**
+ * nlmsvc_release_host - release server nlm_host
+ * @host: nlm_host to release
+ *
+ * Host is destroyed later in nlm_gc_host().
+ */
+void nlmsvc_release_host(struct nlm_host *host)
+{
+ if (host == NULL)
+ return;
+
+ dprintk("lockd: release server host %s\n", host->h_name);
+
+ BUG_ON(atomic_read(&host->h_count) < 0);
+ BUG_ON(!host->h_server);
+ atomic_dec(&host->h_count);
}
/*
@@ -513,22 +582,6 @@ struct nlm_host * nlm_get_host(struct nlm_host *host)
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));
- }
- }
-}
-
static struct nlm_host *next_host_state(struct hlist_head *cache,
struct nsm_handle *nsm,
const struct nlm_reboot *info)
@@ -577,7 +630,7 @@ void nlm_host_rebooted(const struct nlm_reboot *info)
*/
while ((host = next_host_state(nlm_hosts, nsm, info)) != NULL) {
nlmsvc_free_host_resources(host);
- nlm_release_host(host);
+ nlmsvc_release_host(host);
}
while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) {
nlmclnt_recovery(host);
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index c187422..9a41fdc 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -51,7 +51,7 @@ nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
return 0;
no_locks:
- nlm_release_host(host);
+ nlmsvc_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
@@ -92,7 +92,7 @@ nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
else
dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rc;
}
@@ -134,7 +134,7 @@ nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
else
dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rc;
}
@@ -164,7 +164,7 @@ nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -197,7 +197,7 @@ nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = nlmsvc_unlock(file, &argp->lock);
dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -334,7 +334,7 @@ nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = nlmsvc_share_file(host, file, argp);
dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -367,7 +367,7 @@ nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = nlmsvc_unshare_file(host, file, argp);
dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -399,7 +399,7 @@ nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
return rpc_success;
nlmsvc_free_host_resources(host);
- nlm_release_host(host);
+ nlmsvc_release_host(host);
return rpc_success;
}
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 0df65ec..d27aab1 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -80,7 +80,7 @@ nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
return 0;
no_locks:
- nlm_release_host(host);
+ nlmsvc_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
@@ -122,7 +122,7 @@ nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
dprintk("lockd: TEST status %d vers %d\n",
ntohl(resp->status), rqstp->rq_vers);
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rc;
}
@@ -164,7 +164,7 @@ nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
else
dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rc;
}
@@ -194,7 +194,7 @@ nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock));
dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -227,7 +227,7 @@ nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = cast_status(nlmsvc_unlock(file, &argp->lock));
dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -261,7 +261,7 @@ void nlmsvc_release_call(struct nlm_rqst *call)
{
if (!atomic_dec_and_test(&call->a_count))
return;
- nlm_release_host(call->a_host);
+ nlmsvc_release_host(call->a_host);
kfree(call);
}
@@ -374,7 +374,7 @@ nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = cast_status(nlmsvc_share_file(host, file, argp));
dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -407,7 +407,7 @@ nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
resp->status = cast_status(nlmsvc_unshare_file(host, file, argp));
dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
- nlm_release_host(host);
+ nlmsvc_release_host(host);
nlm_release_file(file);
return rpc_success;
}
@@ -439,7 +439,7 @@ nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
return rpc_success;
nlmsvc_free_host_resources(host);
- nlm_release_host(host);
+ nlmsvc_release_host(host);
return rpc_success;
}
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 6c2a0e2..ff9abff 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -227,10 +227,10 @@ void nlmclnt_release_host(struct nlm_host *);
struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
const char *hostname,
const size_t hostname_len);
+void nlmsvc_release_host(struct nlm_host *);
struct rpc_clnt * nlm_bind_host(struct nlm_host *);
void nlm_rebind_host(struct nlm_host *);
struct nlm_host * nlm_get_host(struct nlm_host *);
-void nlm_release_host(struct nlm_host *);
void nlm_shutdown_hosts(void);
void nlm_host_rebooted(const struct nlm_reboot *);
--
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