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Commit 77a3ef33 authored by Chuck Lever's avatar Chuck Lever Committed by J. Bruce Fields
Browse files

NSM: More clean up of nsm_get_handle() 



Clean up: refactor nsm_get_handle() so it is organized the same way that
nsm_reboot_lookup() is.

There is an additional micro-optimization here.  This change moves the
"hostname & nsm_use_hostnames" test out of the list_for_each_entry()
clause in nsm_get_handle(), since it is loop-invariant.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
parent b39b897c

fs/lockd/mon.c

+35 −27
Original line number Diff line number Diff line
@@ -213,6 +213,16 @@ static struct nsm_handle *nsm_lookup_hostname(const char *hostname, 
	return NULL;

}



static struct nsm_handle *nsm_lookup_addr(const struct sockaddr *sap)

{

	struct nsm_handle *nsm;



	list_for_each_entry(nsm, &nsm_handles, sm_link)

		if (nlm_cmp_addr(nsm_addr(nsm), sap))

			return nsm;

	return NULL;

}



static struct nsm_handle *nsm_lookup_priv(const struct nsm_private *priv)

{

	struct nsm_handle *nsm;
@@ -281,8 +291,7 @@ struct nsm_handle *nsm_get_handle(const struct sockaddr *sap, 
				  const size_t salen, const char *hostname,

				  const size_t hostname_len)

{

	struct nsm_handle *nsm = NULL;

	struct nsm_handle *pos;

	struct nsm_handle *cached, *new = NULL;



	if (hostname && memchr(hostname, '/', hostname_len) != NULL) {

		if (printk_ratelimit()) {
@@ -295,38 +304,37 @@ struct nsm_handle *nsm_get_handle(const struct sockaddr *sap, 


retry:

	spin_lock(&nsm_lock);

	list_for_each_entry(pos, &nsm_handles, sm_link) {



		if (hostname && nsm_use_hostnames) {

			if (strlen(pos->sm_name) != hostname_len

			 || memcmp(pos->sm_name, hostname, hostname_len))

				continue;

		} else if (!nlm_cmp_addr(nsm_addr(pos), sap))

			continue;

		atomic_inc(&pos->sm_count);

		kfree(nsm);

		nsm = pos;

		dprintk("lockd: found nsm_handle for %s (%s), cnt %d\n",

				pos->sm_name, pos->sm_addrbuf,

				atomic_read(&pos->sm_count));

		goto found;

	}

	if (nsm) {

		list_add(&nsm->sm_link, &nsm_handles);



	if (nsm_use_hostnames && hostname != NULL)

		cached = nsm_lookup_hostname(hostname, hostname_len);

	else

		cached = nsm_lookup_addr(sap);



	if (cached != NULL) {

		atomic_inc(&cached->sm_count);

		spin_unlock(&nsm_lock);

		kfree(new);

		dprintk("lockd: found nsm_handle for %s (%s), "

				"cnt %d\n", cached->sm_name,

				cached->sm_addrbuf,

				atomic_read(&cached->sm_count));

		return cached;

	}



	if (new != NULL) {

		list_add(&new->sm_link, &nsm_handles);

		spin_unlock(&nsm_lock);

		dprintk("lockd: created nsm_handle for %s (%s)\n",

				nsm->sm_name, nsm->sm_addrbuf);

		goto found;

				new->sm_name, new->sm_addrbuf);

		return new;

	}



	spin_unlock(&nsm_lock);



	nsm = nsm_create_handle(sap, salen, hostname, hostname_len);

	if (unlikely(nsm == NULL))

	new = nsm_create_handle(sap, salen, hostname, hostname_len);

	if (unlikely(new == NULL))

		return NULL;

	goto retry;



found:

	spin_unlock(&nsm_lock);

	return nsm;

}



/**