Commit d71209de authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

[INET]: Use list_head-s in inetpeer.c 



The inetpeer.c tracks the LRU list of inet_perr-s, but makes
it by hands. Use the list_head-s for this.

Signed-off-by: default avatarPavel Emelyanov <xemul@openvz.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 22649d1a

include/net/inetpeer.h

+1 −1
Original line number Diff line number Diff line
@@ -22,7 +22,7 @@ struct inet_peer 
	__be32			v4daddr;	/* peer's address */

	__u16			avl_height;

	__u16			ip_id_count;	/* IP ID for the next packet */

	struct inet_peer	*unused_next, **unused_prevp;

	struct list_head	unused;

	__u32			dtime;		/* the time of last use of not

						 * referenced entries */

	atomic_t		refcnt;

net/ipv4/inetpeer.c

+15 −27
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ 
 *  4.  Global variable peer_total is modified under the pool lock.

 *  5.  struct inet_peer fields modification:

 *		avl_left, avl_right, avl_parent, avl_height: pool lock

 *		unused_next, unused_prevp: unused node list lock

 *		unused: unused node list lock

 *		refcnt: atomically against modifications on other CPU;

 *		   usually under some other lock to prevent node disappearing

 *		dtime: unused node list lock
@@ -94,8 +94,7 @@ int inet_peer_maxttl __read_mostly = 10 * 60 * HZ; /* usual time to live: 10 min 
int inet_peer_gc_mintime __read_mostly = 10 * HZ;

int inet_peer_gc_maxtime __read_mostly = 120 * HZ;



static struct inet_peer *inet_peer_unused_head;

static struct inet_peer **inet_peer_unused_tailp = &inet_peer_unused_head;

static LIST_HEAD(unused_peers);

static DEFINE_SPINLOCK(inet_peer_unused_lock);



static void peer_check_expire(unsigned long dummy);
@@ -138,15 +137,7 @@ void __init inet_initpeers(void) 
static void unlink_from_unused(struct inet_peer *p)

{

	spin_lock_bh(&inet_peer_unused_lock);

	if (p->unused_prevp != NULL) {

		/* On unused list. */

		*p->unused_prevp = p->unused_next;

		if (p->unused_next != NULL)

			p->unused_next->unused_prevp = p->unused_prevp;

		else

			inet_peer_unused_tailp = p->unused_prevp;

		p->unused_prevp = NULL; /* mark it as removed */

	}

	list_del_init(&p->unused);

	spin_unlock_bh(&inet_peer_unused_lock);

}
@@ -337,24 +328,24 @@ static void unlink_from_pool(struct inet_peer *p) 
/* May be called with local BH enabled. */

static int cleanup_once(unsigned long ttl)

{

	struct inet_peer *p;

	struct inet_peer *p = NULL;



	/* Remove the first entry from the list of unused nodes. */

	spin_lock_bh(&inet_peer_unused_lock);

	p = inet_peer_unused_head;

	if (p != NULL) {

		__u32 delta = (__u32)jiffies - p->dtime;

	if (!list_empty(&unused_peers)) {

		__u32 delta;



		p = list_first_entry(&unused_peers, struct inet_peer, unused);

		delta = (__u32)jiffies - p->dtime;



		if (delta < ttl) {

			/* Do not prune fresh entries. */

			spin_unlock_bh(&inet_peer_unused_lock);

			return -1;

		}

		inet_peer_unused_head = p->unused_next;

		if (p->unused_next != NULL)

			p->unused_next->unused_prevp = p->unused_prevp;

		else

			inet_peer_unused_tailp = p->unused_prevp;

		p->unused_prevp = NULL; /* mark as not on the list */



		list_del_init(&p->unused);



		/* Grab an extra reference to prevent node disappearing

		 * before unlink_from_pool() call. */

		atomic_inc(&p->refcnt);
@@ -412,7 +403,7 @@ struct inet_peer *inet_getpeer(__be32 daddr, int create) 


	/* Link the node. */

	link_to_pool(n);

	n->unused_prevp = NULL; /* not on the list */

	INIT_LIST_HEAD(&n->unused);

	peer_total++;

	write_unlock_bh(&peer_pool_lock);
@@ -467,10 +458,7 @@ void inet_putpeer(struct inet_peer *p) 
{

	spin_lock_bh(&inet_peer_unused_lock);

	if (atomic_dec_and_test(&p->refcnt)) {

		p->unused_prevp = inet_peer_unused_tailp;

		p->unused_next = NULL;

		*inet_peer_unused_tailp = p;

		inet_peer_unused_tailp = &p->unused_next;

		list_add_tail(&p->unused, &unused_peers);

		p->dtime = (__u32)jiffies;

	}

	spin_unlock_bh(&inet_peer_unused_lock);