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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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[PATCH] knfsd: lockd: introduce nsm_handle
This patch introduces the nsm_handle, which is shared by all nlm_host objects referring to the same client. With this patch applied, all nlm_hosts from the same address will share the same nsm_handle. A future patch will add sharing by name. Note: this patch changes h_name so that it is no longer guaranteed to be an IP address of the host. When the host represents an NFS server, h_name will be the name passed in the mount call. When the host represents a client, h_name will be the name presented in the lock request received from the client. A h_name is only used for printing informational messages, this change should not be significant. Signed-off-by: Olaf Kirch <okir@suse.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
db4e4c9a9e
commit
8dead0dbd4
4 changed files with 136 additions and 19 deletions
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@ -150,7 +150,8 @@ u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
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static void nlmclnt_prepare_reclaim(struct nlm_host *host)
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{
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down_write(&host->h_rwsem);
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host->h_monitored = 0;
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if (host->h_nsmhandle)
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host->h_nsmhandle->sm_monitored = 0;
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host->h_state++;
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host->h_nextrebind = 0;
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nlm_rebind_host(host);
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121
fs/lockd/host.c
121
fs/lockd/host.c
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@ -34,6 +34,8 @@ static DEFINE_MUTEX(nlm_host_mutex);
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static void nlm_gc_hosts(void);
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static struct nsm_handle * __nsm_find(const struct sockaddr_in *,
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const char *, int, int);
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/*
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* Find an NLM server handle in the cache. If there is none, create it.
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@ -68,7 +70,7 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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int hostname_len)
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{
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struct nlm_host *host, **hp;
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u32 addr;
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struct nsm_handle *nsm = NULL;
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int hash;
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dprintk("lockd: nlm_lookup_host(%u.%u.%u.%u, p=%d, v=%d, my role=%s, name=%.*s)\n",
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@ -86,7 +88,21 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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if (time_after_eq(jiffies, next_gc))
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nlm_gc_hosts();
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/* We may keep several nlm_host objects for a peer, because each
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* nlm_host is identified by
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* (address, protocol, version, server/client)
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* We could probably simplify this a little by putting all those
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* different NLM rpc_clients into one single nlm_host object.
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* This would allow us to have one nlm_host per address.
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*/
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for (hp = &nlm_hosts[hash]; (host = *hp) != 0; hp = &host->h_next) {
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if (!nlm_cmp_addr(&host->h_addr, sin))
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continue;
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/* See if we have an NSM handle for this client */
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if (!nsm && (nsm = host->h_nsmhandle) != 0)
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atomic_inc(&nsm->sm_count);
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if (host->h_proto != proto)
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continue;
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if (host->h_version != version)
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@ -94,7 +110,7 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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if (host->h_server != server)
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continue;
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if (nlm_cmp_addr(&host->h_addr, sin)) {
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{
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if (hp != nlm_hosts + hash) {
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*hp = host->h_next;
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host->h_next = nlm_hosts[hash];
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@ -106,16 +122,18 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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}
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}
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/* Ooops, no host found, create it */
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dprintk("lockd: creating host entry\n");
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/* Sadly, the host isn't in our hash table yet. See if
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* we have an NSM handle for it. If not, create one.
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*/
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if (!nsm && !(nsm = nsm_find(sin, hostname, hostname_len)))
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goto out;
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host = kzalloc(sizeof(*host), GFP_KERNEL);
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if (!host)
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goto nohost;
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addr = sin->sin_addr.s_addr;
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sprintf(host->h_name, "%u.%u.%u.%u", NIPQUAD(addr));
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if (!host) {
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nsm_release(nsm);
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goto out;
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}
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host->h_name = nsm->sm_name;
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host->h_addr = *sin;
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host->h_addr.sin_port = 0; /* ouch! */
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host->h_version = version;
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@ -129,6 +147,7 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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init_rwsem(&host->h_rwsem);
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host->h_state = 0; /* pseudo NSM state */
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host->h_nsmstate = 0; /* real NSM state */
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host->h_nsmhandle = nsm;
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host->h_server = server;
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host->h_next = nlm_hosts[hash];
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nlm_hosts[hash] = host;
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@ -140,7 +159,7 @@ nlm_lookup_host(int server, const struct sockaddr_in *sin,
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if (++nrhosts > NLM_HOST_MAX)
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next_gc = 0;
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nohost:
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out:
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mutex_unlock(&nlm_host_mutex);
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return host;
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}
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@ -393,3 +412,83 @@ nlm_gc_hosts(void)
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next_gc = jiffies + NLM_HOST_COLLECT;
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}
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/*
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* Manage NSM handles
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*/
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static LIST_HEAD(nsm_handles);
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static DECLARE_MUTEX(nsm_sema);
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static struct nsm_handle *
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__nsm_find(const struct sockaddr_in *sin,
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const char *hostname, int hostname_len,
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int create)
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{
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struct nsm_handle *nsm = NULL;
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struct list_head *pos;
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if (!sin)
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return NULL;
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if (hostname && memchr(hostname, '/', hostname_len) != NULL) {
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if (printk_ratelimit()) {
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printk(KERN_WARNING "Invalid hostname \"%.*s\" "
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"in NFS lock request\n",
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hostname_len, hostname);
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}
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return NULL;
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}
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down(&nsm_sema);
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list_for_each(pos, &nsm_handles) {
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nsm = list_entry(pos, struct nsm_handle, sm_link);
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if (!nlm_cmp_addr(&nsm->sm_addr, sin))
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continue;
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atomic_inc(&nsm->sm_count);
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goto out;
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}
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if (!create) {
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nsm = NULL;
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goto out;
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}
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nsm = kzalloc(sizeof(*nsm) + hostname_len + 1, GFP_KERNEL);
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if (nsm != NULL) {
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nsm->sm_addr = *sin;
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nsm->sm_name = (char *) (nsm + 1);
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memcpy(nsm->sm_name, hostname, hostname_len);
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nsm->sm_name[hostname_len] = '\0';
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atomic_set(&nsm->sm_count, 1);
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list_add(&nsm->sm_link, &nsm_handles);
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}
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out: up(&nsm_sema);
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return nsm;
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}
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struct nsm_handle *
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nsm_find(const struct sockaddr_in *sin, const char *hostname, int hostname_len)
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{
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return __nsm_find(sin, hostname, hostname_len, 1);
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}
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/*
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* Release an NSM handle
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*/
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void
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nsm_release(struct nsm_handle *nsm)
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{
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if (!nsm)
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return;
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if (atomic_dec_and_test(&nsm->sm_count)) {
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down(&nsm_sema);
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if (atomic_read(&nsm->sm_count) == 0) {
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list_del(&nsm->sm_link);
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kfree(nsm);
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}
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up(&nsm_sema);
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}
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}
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@ -70,11 +70,14 @@ nsm_mon_unmon(struct nlm_host *host, u32 proc, struct nsm_res *res)
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int
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nsm_monitor(struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status;
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dprintk("lockd: nsm_monitor(%s)\n", host->h_name);
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if (host->h_monitored)
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BUG_ON(nsm == NULL);
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if (nsm->sm_monitored)
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return 0;
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status = nsm_mon_unmon(host, SM_MON, &res);
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@ -82,7 +85,7 @@ nsm_monitor(struct nlm_host *host)
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if (status < 0 || res.status != 0)
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printk(KERN_NOTICE "lockd: cannot monitor %s\n", host->h_name);
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else
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host->h_monitored = 1;
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nsm->sm_monitored = 1;
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return status;
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}
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@ -92,19 +95,22 @@ nsm_monitor(struct nlm_host *host)
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int
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nsm_unmonitor(struct nlm_host *host)
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{
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struct nsm_handle *nsm = host->h_nsmhandle;
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struct nsm_res res;
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int status = 0;
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dprintk("lockd: nsm_unmonitor(%s)\n", host->h_name);
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if (!host->h_monitored)
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if (nsm == NULL)
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return 0;
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host->h_monitored = 0;
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host->h_nsmhandle = NULL;
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if (!host->h_killed) {
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status = nsm_mon_unmon(host, SM_UNMON, &res);
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if (status < 0)
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printk(KERN_NOTICE "lockd: cannot unmonitor %s\n", host->h_name);
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nsm->sm_monitored = 0;
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}
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nsm_release(nsm);
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return status;
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}
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@ -40,14 +40,13 @@ struct nlm_host {
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struct nlm_host * h_next; /* linked list (hash table) */
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struct sockaddr_in h_addr; /* peer address */
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struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
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char h_name[20]; /* remote hostname */
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char * h_name; /* remote hostname */
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u32 h_version; /* interface version */
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unsigned short h_proto; /* transport proto */
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unsigned short h_reclaiming : 1,
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h_server : 1, /* server side, not client side */
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h_inuse : 1,
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h_killed : 1,
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h_monitored : 1;
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h_killed : 1;
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wait_queue_head_t h_gracewait; /* wait while reclaiming */
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struct rw_semaphore h_rwsem; /* Reboot recovery lock */
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u32 h_state; /* pseudo-state counter */
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@ -61,6 +60,16 @@ struct nlm_host {
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spinlock_t h_lock;
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struct list_head h_granted; /* Locks in GRANTED state */
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struct list_head h_reclaim; /* Locks in RECLAIM state */
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struct nsm_handle * h_nsmhandle; /* NSM status handle */
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};
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struct nsm_handle {
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struct list_head sm_link;
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atomic_t sm_count;
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char * sm_name;
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struct sockaddr_in sm_addr;
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unsigned int sm_monitored : 1,
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sm_sticky : 1; /* don't unmonitor */
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};
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/*
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@ -171,6 +180,8 @@ void nlm_release_host(struct nlm_host *);
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void nlm_shutdown_hosts(void);
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extern struct nlm_host *nlm_find_client(void);
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extern void nlm_host_rebooted(const struct sockaddr_in *, const struct nlm_reboot *);
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struct nsm_handle *nsm_find(const struct sockaddr_in *, const char *, int);
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void nsm_release(struct nsm_handle *);
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/*
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