diff options
author | Chuck Lever <chuck.lever@oracle.com> | 2010-12-14 18:06:12 +0300 |
---|---|---|
committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-12-16 20:37:26 +0300 |
commit | 67216b94d498f5880d8bba2a6b841880739dd524 (patch) | |
tree | c1334c1db47782b6af9cd69e5165538d9659bca1 /fs/lockd/host.c | |
parent | 8ea6ecc8b0759756a766c05dc7c98c51ec90de37 (diff) | |
download | linux-67216b94d498f5880d8bba2a6b841880739dd524.tar.xz |
lockd: Clean up nlmsvc_lookup_host()
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 equivalent of the
nlm_release_host() function.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd/host.c')
-rw-r--r-- | fs/lockd/host.c | 91 |
1 files changed, 72 insertions, 19 deletions
diff --git a/fs/lockd/host.c b/fs/lockd/host.c index c6942fb4bd0d..0250b0e4f5e9 100644 --- a/fs/lockd/host.c +++ b/fs/lockd/host.c @@ -383,6 +383,10 @@ 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, }; @@ -404,6 +408,8 @@ 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; @@ -414,10 +420,73 @@ 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); } /* @@ -517,22 +586,6 @@ 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) @@ -581,7 +634,7 @@ 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); |