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authorChuck Lever <chuck.lever@oracle.com>2008-12-06 01:03:46 +0100
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-01-06 17:53:54 +0100
commit3420a8c4359a189f7d854ed7075d151257415447 (patch)
treedbcfbcdd9383bc4a9bb832f6b4a8876461495dc8 /fs/lockd
parentNLM: Decode "priv" argument of NLMPROC_SM_NOTIFY as an opaque (diff)
downloadlinux-3420a8c4359a189f7d854ed7075d151257415447.tar.xz
linux-3420a8c4359a189f7d854ed7075d151257415447.zip
NSM: Add nsm_lookup() function
Introduce a new API to fs/lockd/mon.c that allows nlm_host_rebooted() to lookup up nsm_handles via the contents of an nlm_reboot struct. The new function is equivalent to calling nsm_find() with @create set to zero, but it takes a struct nlm_reboot instead of separate arguments. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'fs/lockd')
-rw-r--r--fs/lockd/mon.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 4424b0a5a51f..e46903995c99 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -201,6 +201,29 @@ void nsm_unmonitor(const struct nlm_host *host)
}
}
+static struct nsm_handle *nsm_lookup_hostname(const char *hostname,
+ const size_t len)
+{
+ struct nsm_handle *nsm;
+
+ list_for_each_entry(nsm, &nsm_handles, sm_link)
+ if (strlen(nsm->sm_name) == len &&
+ memcmp(nsm->sm_name, hostname, len) == 0)
+ return nsm;
+ return NULL;
+}
+
+static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)
+{
+ struct nsm_handle *nsm;
+
+ list_for_each_entry(nsm, &nsm_handles, sm_link)
+ if (memcmp(nsm->sm_priv.data, priv->data,
+ sizeof(priv->data)) == 0)
+ return nsm;
+ return NULL;
+}
+
/*
* Construct a unique cookie to match this nsm_handle to this monitored
* host. It is passed to the local rpc.statd via NSMPROC_MON, and
@@ -298,6 +321,47 @@ found:
}
/**
+ * nsm_reboot_lookup - match NLMPROC_SM_NOTIFY arguments to an nsm_handle
+ * @info: pointer to NLMPROC_SM_NOTIFY arguments
+ *
+ * Returns a matching nsm_handle if found in the nsm cache; the returned
+ * nsm_handle's reference count is bumped and sm_monitored is cleared.
+ * Otherwise returns NULL if some error occurred.
+ */
+struct nsm_handle *nsm_reboot_lookup(const struct nlm_reboot *info)
+{
+ struct nsm_handle *cached;
+
+ spin_lock(&nsm_lock);
+
+ if (nsm_use_hostnames && info->mon != NULL)
+ cached = nsm_lookup_hostname(info->mon, info->len);
+ else
+ cached = nsm_lookup_priv(&info->priv);
+
+ if (unlikely(cached == NULL)) {
+ spin_unlock(&nsm_lock);
+ dprintk("lockd: never saw rebooted peer '%.*s' before\n",
+ info->len, info->mon);
+ return cached;
+ }
+
+ atomic_inc(&cached->sm_count);
+ spin_unlock(&nsm_lock);
+
+ /*
+ * During subsequent lock activity, force a fresh
+ * notification to be set up for this host.
+ */
+ cached->sm_monitored = 0;
+
+ dprintk("lockd: host %s (%s) rebooted, cnt %d\n",
+ cached->sm_name, cached->sm_addrbuf,
+ atomic_read(&cached->sm_count));
+ return cached;
+}
+
+/**
* nsm_release - Release an NSM handle
* @nsm: pointer to handle to be released
*