dlm: Do not allocate a fd for peeloff

avoids allocating a fd that a) propagates to every kernel thread and
usermodehelper b) is not properly released.

References: http://article.gmane.org/gmane.linux.network.drbd/22529
Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 14 deletions

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 0b3109ee4257..ca0c59a4246c 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -52,6 +52,7 @@
 #include <linux/mutex.h>
 #include <linux/sctp.h>
 #include <linux/slab.h>
+#include <net/sctp/sctp.h>
 #include <net/sctp/user.h>
 #include <net/ipv6.h>
 
@@ -474,9 +475,6 @@ static void process_sctp_notification(struct connection *con,
                         int prim_len, ret;
                         int addr_len;
                         struct connection *new_con;
-                        sctp_peeloff_arg_t parg;
-                        int parglen = sizeof(parg);
-                        int err;
 
                         /*
                          * We get this before any data for an association.
@@ -525,23 +523,19 @@ static void process_sctp_notification(struct connection *con,
                                 return;
 
                         /* Peel off a new sock */
-                        parg.associd = sn->sn_assoc_change.sac_assoc_id;
-                        ret = kernel_getsockopt(con->sock, IPPROTO_SCTP,
-                                                SCTP_SOCKOPT_PEELOFF,
-                                                (void *)&parg, &parglen);
+                        sctp_lock_sock(con->sock->sk);
+                        ret = sctp_do_peeloff(con->sock->sk,
+                                sn->sn_assoc_change.sac_assoc_id,
+                                &new_con->sock);
+                        sctp_release_sock(con->sock->sk);
                         if (ret < 0) {
                                 log_print("Can't peel off a socket for "
                                           "connection %d to node %d: err=%d",
-                                          parg.associd, nodeid, ret);
-                                return;
-                        }
-                        new_con->sock = sockfd_lookup(parg.sd, &err);
-                        if (!new_con->sock) {
-                                log_print("sockfd_lookup error %d", err);
+                                          (int)sn->sn_assoc_change.sac_assoc_id,
+                                          nodeid, ret);
                                 return;
                         }
                         add_sock(new_con->sock, new_con);
-                        sockfd_put(new_con->sock);
 
                         log_print("connecting to %d sctp association %d",
                                  nodeid, (int)sn->sn_assoc_change.sac_assoc_id);