From 8ea6ecc8b0759756a766c05dc7c98c51ec90de37 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Tue, 14 Dec 2010 15:05:52 +0000 Subject: [PATCH] lockd: Create client-side nlm_host cache NFS clients don't need the garbage collection processing that is performed on nlm_host structures. The client picks up an nlm_host at mount time and holds a reference to it until the file system is unmounted. Servers, on the other hand, don't have a precise way to tell when an nlm_host is no longer being used, so zero refcount nlm_host entries are left to expire in the cache after a time. Basically there's nothing holding a reference to an nlm_host between individual server-side NLM requests, but we can't afford the expense of recreating them for every new NLM request from a client. The nlm_host cache adds some lifetime hysteresis to entries in the cache so the next time a particular nlm_host is needed, it's likely to be discovered by a lookup rather than created from whole cloth. With the new implementation, client nlm_host cache items are no longer garbage collected, and are destroyed directly by a new release function specialized for client entries, nlmclnt_release_host(). They are cached in their own data structure, and have their own lookup logic, simplified and specialized for client nlm_host entries. However, the client nlm_host cache still shares reboot recovery logic with the server nlm_host cache. The NSM "peer rebooted" downcall for clients and servers still come through the same RPC call. This is a legacy formal API that would be difficult to alter, and besides, the user space NSM implementation can't tell the difference between peers that are clients or servers. For this reason, the client cache continues to share the nlm_host_mutex (and reboot recovery logic) with the server cache. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust --- fs/lockd/clntlock.c | 4 +- fs/lockd/clntproc.c | 6 +-- fs/lockd/host.c | 81 ++++++++++++++++++++++++++++++++----- include/linux/lockd/lockd.h | 1 + 4 files changed, 78 insertions(+), 14 deletions(-) diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c index 25509eb28fd7..8d4ea8351e3d 100644 --- a/fs/lockd/clntlock.c +++ b/fs/lockd/clntlock.c @@ -79,7 +79,7 @@ EXPORT_SYMBOL_GPL(nlmclnt_init); */ void nlmclnt_done(struct nlm_host *host) { - nlm_release_host(host); + nlmclnt_release_host(host); lockd_down(); } EXPORT_SYMBOL_GPL(nlmclnt_done); @@ -273,7 +273,7 @@ restart: spin_unlock(&nlm_blocked_lock); /* Release host handle after use */ - nlm_release_host(host); + nlmclnt_release_host(host); lockd_down(); return 0; } diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index fbc6617f76c4..adb45ec9038c 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -58,7 +58,7 @@ static void nlm_put_lockowner(struct nlm_lockowner *lockowner) return; list_del(&lockowner->list); spin_unlock(&lockowner->host->h_lock); - nlm_release_host(lockowner->host); + nlmclnt_release_host(lockowner->host); kfree(lockowner); } @@ -207,7 +207,7 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host) printk("nlm_alloc_call: failed, waiting for memory\n"); schedule_timeout_interruptible(5*HZ); } - nlm_release_host(host); + nlmclnt_release_host(host); return NULL; } @@ -215,7 +215,7 @@ void nlmclnt_release_call(struct nlm_rqst *call) { if (!atomic_dec_and_test(&call->a_count)) return; - nlm_release_host(call->a_host); + nlmclnt_release_host(call->a_host); nlmclnt_release_lockargs(call); kfree(call); } diff --git a/fs/lockd/host.c b/fs/lockd/host.c index e58e1426d161..c6942fb4bd0d 100644 --- a/fs/lockd/host.c +++ b/fs/lockd/host.c @@ -26,6 +26,7 @@ #define NLM_HOST_COLLECT (120 * HZ) static struct hlist_head nlm_hosts[NLM_HOST_NRHASH]; +static struct hlist_head nlm_client_hosts[NLM_HOST_NRHASH]; #define for_each_host(host, pos, chain, table) \ for ((chain) = (table); \ @@ -288,12 +289,76 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, .hostname_len = strlen(hostname), .noresvport = noresvport, }; + struct hlist_head *chain; + struct hlist_node *pos; + struct nlm_host *host; + struct nsm_handle *nsm = NULL; dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__, (hostname ? hostname : ""), version, (protocol == IPPROTO_UDP ? "udp" : "tcp")); - return nlm_lookup_host(&ni); + mutex_lock(&nlm_host_mutex); + + chain = &nlm_client_hosts[nlm_hash_address(sap)]; + hlist_for_each_entry(host, pos, chain, h_hash) { + if (!rpc_cmp_addr(nlm_addr(host), sap)) + continue; + + /* Same address. Share an NSM handle if we already have one */ + if (nsm == NULL) + nsm = host->h_nsmhandle; + + if (host->h_proto != protocol) + continue; + if (host->h_version != version) + continue; + + 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; + + 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; +} + +/** + * nlmclnt_release_host - release client nlm_host + * @host: nlm_host to release + * + */ +void nlmclnt_release_host(struct nlm_host *host) +{ + if (host == NULL) + return; + + dprintk("lockd: release client host %s\n", host->h_name); + + BUG_ON(atomic_read(&host->h_count) < 0); + BUG_ON(host->h_server); + + 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)); + + mutex_lock(&nlm_host_mutex); + nlm_destroy_host_locked(host); + mutex_unlock(&nlm_host_mutex); + } } /** @@ -515,16 +580,14 @@ void nlm_host_rebooted(const struct nlm_reboot *info) * To avoid processing a host several times, we match the nsmstate. */ while ((host = next_host_state(nlm_hosts, nsm, info)) != NULL) { - 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); - } + nlmsvc_free_host_resources(host); nlm_release_host(host); } + while ((host = next_host_state(nlm_client_hosts, nsm, info)) != NULL) { + nlmclnt_recovery(host); + nlmclnt_release_host(host); + } + nsm_release(nsm); } diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index a32ba62455af..6c2a0e2f298e 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -223,6 +223,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap, const u32 version, const char *hostname, int noresvport); +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); -- 2.20.1