[PATCH] knfsd: lockd: Make nlm_host_rebooted use the nsm_handle
This patch makes the SM_NOTIFY handling understand and use the nsm_handle.
To make it a bit clear what is happening:
nlmclent_prepare_reclaim and nlmclnt_finish_reclaim
get open-coded into 'reclaimer'
The result is tidied up.
Then some of that functionality is moved out into nlm_host_rebooted (which
calls nlmclnt_recovery which starts a thread which runs reclaimer).
Also host_rebooted now finds an nsm_handle rather than a host, then then
iterates over all hosts and deals with each host that shares that nsm_handle.
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>
diff --git a/fs/lockd/clntlock.c b/fs/lockd/clntlock.c
index 54e63dd..a4ab6dd 100644
--- a/fs/lockd/clntlock.c
+++ b/fs/lockd/clntlock.c
@@ -144,43 +144,12 @@
*/
/*
- * Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number,
- * that we mark locks for reclaiming, and that we bump the pseudo NSM state.
- */
-static void nlmclnt_prepare_reclaim(struct nlm_host *host)
-{
- down_write(&host->h_rwsem);
- if (host->h_nsmhandle)
- host->h_nsmhandle->sm_monitored = 0;
- host->h_state++;
- host->h_nextrebind = 0;
- nlm_rebind_host(host);
-
- /*
- * Mark the locks for reclaiming.
- */
- list_splice_init(&host->h_granted, &host->h_reclaim);
-
- dprintk("NLM: reclaiming locks for host %s\n", host->h_name);
-}
-
-static void nlmclnt_finish_reclaim(struct nlm_host *host)
-{
- host->h_reclaiming = 0;
- up_write(&host->h_rwsem);
- dprintk("NLM: done reclaiming locks for host %s", host->h_name);
-}
-
-/*
* Reclaim all locks on server host. We do this by spawning a separate
* reclaimer thread.
*/
void
-nlmclnt_recovery(struct nlm_host *host, u32 newstate)
+nlmclnt_recovery(struct nlm_host *host)
{
- if (host->h_nsmstate == newstate)
- return;
- host->h_nsmstate = newstate;
if (!host->h_reclaiming++) {
nlm_get_host(host);
__module_get(THIS_MODULE);
@@ -200,18 +169,30 @@
daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
+ down_write(&host->h_rwsem);
+
/* This one ensures that our parent doesn't terminate while the
* reclaim is in progress */
lock_kernel();
lockd_up(0); /* note: this cannot fail as lockd is already running */
- nlmclnt_prepare_reclaim(host);
- /* First, reclaim all locks that have been marked. */
+ dprintk("lockd: reclaiming locks for host %s", host->h_name);
+
restart:
nsmstate = host->h_nsmstate;
+
+ /* Force a portmap getport - the peer's lockd will
+ * most likely end up on a different port.
+ */
+ host->h_nextrebind = 0;
+ nlm_rebind_host(host);
+
+ /* First, reclaim all locks that have been granted. */
+ list_splice_init(&host->h_granted, &host->h_reclaim);
list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
list_del_init(&fl->fl_u.nfs_fl.list);
+ /* Why are we leaking memory here? --okir */
if (signalled())
continue;
if (nlmclnt_reclaim(host, fl) != 0)
@@ -219,11 +200,13 @@
list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
if (host->h_nsmstate != nsmstate) {
/* Argh! The server rebooted again! */
- list_splice_init(&host->h_granted, &host->h_reclaim);
goto restart;
}
}
- nlmclnt_finish_reclaim(host);
+
+ host->h_reclaiming = 0;
+ up_write(&host->h_rwsem);
+ dprintk("NLM: done reclaiming locks for host %s", host->h_name);
/* Now, wake up all processes that sleep on a blocked lock */
list_for_each_entry(block, &nlm_blocked, b_list) {
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 4990223..3cd96e2 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -290,28 +290,57 @@
* has rebooted.
* Release all resources held by that peer.
*/
-void nlm_host_rebooted(const struct sockaddr_in *sin, const struct nlm_reboot *argp)
+void nlm_host_rebooted(const struct sockaddr_in *sin,
+ const char *hostname, int hostname_len,
+ u32 new_state)
{
- struct nlm_host *host;
- int server;
+ struct nsm_handle *nsm;
+ struct nlm_host *host, **hp;
+ int hash;
- /* Obtain the host pointer for this NFS server and try to
- * reclaim all locks we hold on this server.
- */
- server = (argp->proto & 1)? 1 : 0;
- host = nlm_lookup_host(server, sin, argp->proto >> 1, argp->vers,
- argp->mon, argp->len);
- if (host == NULL)
+ 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)))
return;
- if (server == 0) {
- /* We are client, he's the server: try to reclaim all locks. */
- nlmclnt_recovery(host, argp->state);
- } else {
- /* He's the client, we're the server: delete all locks held by the client */
- nlmsvc_free_host_resources(host);
+ /* When reclaiming locks on this peer, make sure that
+ * we set up a new notification */
+ nsm->sm_monitored = 0;
+
+ /* Mark all hosts tied to this NSM state as having rebooted.
+ * We run the loop repeatedly, because we drop the host table
+ * lock for this.
+ * To avoid processing a host several times, we match the nsmstate.
+ */
+again: mutex_lock(&nlm_host_mutex);
+ for (hash = 0; hash < NLM_HOST_NRHASH; hash++) {
+ for (hp = &nlm_hosts[hash]; (host = *hp); hp = &host->h_next) {
+ if (host->h_nsmhandle == nsm
+ && host->h_nsmstate != new_state) {
+ host->h_nsmstate = new_state;
+ host->h_state++;
+
+ nlm_get_host(host);
+ mutex_unlock(&nlm_host_mutex);
+
+ 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);
+ }
+
+ nlm_release_host(host);
+ goto again;
+ }
+ }
}
- nlm_release_host(host);
+
+ mutex_unlock(&nlm_host_mutex);
}
/*
diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c
index 7d835ad..b8525fb 100644
--- a/fs/lockd/svc4proc.c
+++ b/fs/lockd/svc4proc.c
@@ -438,7 +438,7 @@
*/
memset(&saddr, 0, sizeof(saddr));
saddr.sin_addr.s_addr = argp->addr;
- nlm_host_rebooted(&saddr, argp);
+ nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
return rpc_success;
}
diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c
index 12291ab..66e7b0b 100644
--- a/fs/lockd/svcproc.c
+++ b/fs/lockd/svcproc.c
@@ -467,7 +467,7 @@
*/
memset(&saddr, 0, sizeof(saddr));
saddr.sin_addr.s_addr = argp->addr;
- nlm_host_rebooted(&saddr, argp);
+ nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state);
return rpc_success;
}