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Commit 719f8bcc authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

svcrpc: fix xpt_list traversal locking on shutdown 



Server threads are not running at this point, but svc_age_temp_xprts
still may be, so we need this locking.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 21179d81

net/sunrpc/svc_xprt.c

+15 −9
Original line number Diff line number Diff line
@@ -917,16 +917,18 @@ void svc_close_xprt(struct svc_xprt *xprt) 
}

EXPORT_SYMBOL_GPL(svc_close_xprt);



static void svc_close_list(struct list_head *xprt_list, struct net *net)

static void svc_close_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)

{

	struct svc_xprt *xprt;



	spin_lock(&serv->sv_lock);

	list_for_each_entry(xprt, xprt_list, xpt_list) {

		if (xprt->xpt_net != net)

			continue;

		set_bit(XPT_CLOSE, &xprt->xpt_flags);

		set_bit(XPT_BUSY, &xprt->xpt_flags);

	}

	spin_unlock(&serv->sv_lock);

}



static void svc_clear_pools(struct svc_serv *serv, struct net *net)
@@ -949,24 +951,28 @@ static void svc_clear_pools(struct svc_serv *serv, struct net *net) 
	}

}



static void svc_clear_list(struct list_head *xprt_list, struct net *net)

static void svc_clear_list(struct svc_serv *serv, struct list_head *xprt_list, struct net *net)

{

	struct svc_xprt *xprt;

	struct svc_xprt *tmp;

	LIST_HEAD(victims);



	spin_lock(&serv->sv_lock);

	list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) {

		if (xprt->xpt_net != net)

			continue;

		svc_delete_xprt(xprt);

		list_move(&xprt->xpt_list, &victims);

	}

	list_for_each_entry(xprt, xprt_list, xpt_list)

		BUG_ON(xprt->xpt_net == net);

	spin_unlock(&serv->sv_lock);



	list_for_each_entry_safe(xprt, tmp, &victims, xpt_list)

		svc_delete_xprt(xprt);

}



void svc_close_net(struct svc_serv *serv, struct net *net)

{

	svc_close_list(&serv->sv_tempsocks, net);

	svc_close_list(&serv->sv_permsocks, net);

	svc_close_list(serv, &serv->sv_tempsocks, net);

	svc_close_list(serv, &serv->sv_permsocks, net);



	svc_clear_pools(serv, net);

	/*
@@ -974,8 +980,8 @@ void svc_close_net(struct svc_serv *serv, struct net *net) 
	 * svc_xprt_enqueue will not add new entries without taking the

	 * sp_lock and checking XPT_BUSY.

	 */

	svc_clear_list(&serv->sv_tempsocks, net);

	svc_clear_list(&serv->sv_permsocks, net);

	svc_clear_list(serv, &serv->sv_tempsocks, net);

	svc_clear_list(serv, &serv->sv_permsocks, net);

}



/*