507 lines
13 KiB
C
507 lines
13 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2011, 2015, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*/
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#define DEBUG_SUBSYSTEM S_LNET
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#include <linux/completion.h>
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#include <net/sock.h>
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#include "../../include/linux/lnet/lib-lnet.h"
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static int accept_port = 988;
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static int accept_backlog = 127;
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static int accept_timeout = 5;
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static struct {
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int pta_shutdown;
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struct socket *pta_sock;
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struct completion pta_signal;
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} lnet_acceptor_state = {
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.pta_shutdown = 1
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};
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int
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lnet_acceptor_port(void)
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{
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return accept_port;
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}
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EXPORT_SYMBOL(lnet_acceptor_port);
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static inline int
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lnet_accept_magic(__u32 magic, __u32 constant)
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{
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return (magic == constant ||
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magic == __swab32(constant));
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}
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static char *accept = "secure";
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module_param(accept, charp, 0444);
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MODULE_PARM_DESC(accept, "Accept connections (secure|all|none)");
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module_param(accept_port, int, 0444);
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MODULE_PARM_DESC(accept_port, "Acceptor's port (same on all nodes)");
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module_param(accept_backlog, int, 0444);
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MODULE_PARM_DESC(accept_backlog, "Acceptor's listen backlog");
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module_param(accept_timeout, int, 0644);
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MODULE_PARM_DESC(accept_timeout, "Acceptor's timeout (seconds)");
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static char *accept_type;
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static int
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lnet_acceptor_get_tunables(void)
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{
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/*
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* Userland acceptor uses 'accept_type' instead of 'accept', due to
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* conflict with 'accept(2)', but kernel acceptor still uses 'accept'
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* for compatibility. Hence the trick.
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*/
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accept_type = accept;
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return 0;
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}
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int
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lnet_acceptor_timeout(void)
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{
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return accept_timeout;
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}
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EXPORT_SYMBOL(lnet_acceptor_timeout);
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void
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lnet_connect_console_error(int rc, lnet_nid_t peer_nid,
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__u32 peer_ip, int peer_port)
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{
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switch (rc) {
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/* "normal" errors */
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case -ECONNREFUSED:
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CNETERR("Connection to %s at host %pI4h on port %d was refused: check that Lustre is running on that node.\n",
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libcfs_nid2str(peer_nid),
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&peer_ip, peer_port);
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break;
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case -EHOSTUNREACH:
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case -ENETUNREACH:
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CNETERR("Connection to %s at host %pI4h was unreachable: the network or that node may be down, or Lustre may be misconfigured.\n",
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libcfs_nid2str(peer_nid), &peer_ip);
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break;
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case -ETIMEDOUT:
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CNETERR("Connection to %s at host %pI4h on port %d took too long: that node may be hung or experiencing high load.\n",
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libcfs_nid2str(peer_nid),
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&peer_ip, peer_port);
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break;
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case -ECONNRESET:
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LCONSOLE_ERROR_MSG(0x11b, "Connection to %s at host %pI4h on port %d was reset: is it running a compatible version of Lustre and is %s one of its NIDs?\n",
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libcfs_nid2str(peer_nid),
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&peer_ip, peer_port,
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libcfs_nid2str(peer_nid));
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break;
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case -EPROTO:
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LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at host %pI4h on port %d: is it running a compatible version of Lustre?\n",
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libcfs_nid2str(peer_nid),
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&peer_ip, peer_port);
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break;
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case -EADDRINUSE:
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LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to connect to %s at host %pI4h on port %d\n",
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libcfs_nid2str(peer_nid),
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&peer_ip, peer_port);
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break;
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default:
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LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s at host %pI4h on port %d\n",
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rc, libcfs_nid2str(peer_nid),
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&peer_ip, peer_port);
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break;
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}
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}
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EXPORT_SYMBOL(lnet_connect_console_error);
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int
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lnet_connect(struct socket **sockp, lnet_nid_t peer_nid,
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__u32 local_ip, __u32 peer_ip, int peer_port)
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{
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lnet_acceptor_connreq_t cr;
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struct socket *sock;
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int rc;
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int port;
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int fatal;
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CLASSERT(sizeof(cr) <= 16); /* not too big to be on the stack */
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for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT;
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port >= LNET_ACCEPTOR_MIN_RESERVED_PORT;
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--port) {
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/* Iterate through reserved ports. */
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rc = lnet_sock_connect(&sock, &fatal, local_ip, port, peer_ip,
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peer_port);
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if (rc) {
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if (fatal)
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goto failed;
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continue;
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}
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CLASSERT(LNET_PROTO_ACCEPTOR_VERSION == 1);
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cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
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cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
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cr.acr_nid = peer_nid;
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if (the_lnet.ln_testprotocompat) {
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/* single-shot proto check */
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lnet_net_lock(LNET_LOCK_EX);
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if (the_lnet.ln_testprotocompat & 4) {
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cr.acr_version++;
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the_lnet.ln_testprotocompat &= ~4;
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}
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if (the_lnet.ln_testprotocompat & 8) {
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cr.acr_magic = LNET_PROTO_MAGIC;
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the_lnet.ln_testprotocompat &= ~8;
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}
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lnet_net_unlock(LNET_LOCK_EX);
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}
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rc = lnet_sock_write(sock, &cr, sizeof(cr), accept_timeout);
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if (rc)
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goto failed_sock;
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*sockp = sock;
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return 0;
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}
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rc = -EADDRINUSE;
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goto failed;
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failed_sock:
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sock_release(sock);
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failed:
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lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port);
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return rc;
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}
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EXPORT_SYMBOL(lnet_connect);
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static int
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lnet_accept(struct socket *sock, __u32 magic)
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{
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lnet_acceptor_connreq_t cr;
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__u32 peer_ip;
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int peer_port;
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int rc;
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int flip;
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lnet_ni_t *ni;
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char *str;
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LASSERT(sizeof(cr) <= 16); /* not too big for the stack */
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rc = lnet_sock_getaddr(sock, 1, &peer_ip, &peer_port);
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LASSERT(!rc); /* we succeeded before */
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if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) {
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if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) {
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/*
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* future version compatibility!
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* When LNET unifies protocols over all LNDs, the first
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* thing sent will be a version query. I send back
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* LNET_PROTO_ACCEPTOR_MAGIC to tell her I'm "old"
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*/
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memset(&cr, 0, sizeof(cr));
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cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
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cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
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rc = lnet_sock_write(sock, &cr, sizeof(cr),
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accept_timeout);
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if (rc)
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CERROR("Error sending magic+version in response to LNET magic from %pI4h: %d\n",
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&peer_ip, rc);
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return -EPROTO;
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}
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if (magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC))
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str = "'old' socknal/tcpnal";
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else
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str = "unrecognised";
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LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %pI4h magic %08x: %s acceptor protocol\n",
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&peer_ip, magic, str);
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return -EPROTO;
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}
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flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC);
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rc = lnet_sock_read(sock, &cr.acr_version, sizeof(cr.acr_version),
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accept_timeout);
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if (rc) {
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CERROR("Error %d reading connection request version from %pI4h\n",
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rc, &peer_ip);
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return -EIO;
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}
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if (flip)
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__swab32s(&cr.acr_version);
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if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) {
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/*
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* future version compatibility!
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* An acceptor-specific protocol rev will first send a version
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* query. I send back my current version to tell her I'm
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* "old".
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*/
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int peer_version = cr.acr_version;
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memset(&cr, 0, sizeof(cr));
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cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC;
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cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION;
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rc = lnet_sock_write(sock, &cr, sizeof(cr), accept_timeout);
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if (rc)
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CERROR("Error sending magic+version in response to version %d from %pI4h: %d\n",
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peer_version, &peer_ip, rc);
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return -EPROTO;
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}
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rc = lnet_sock_read(sock, &cr.acr_nid,
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sizeof(cr) -
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offsetof(lnet_acceptor_connreq_t, acr_nid),
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accept_timeout);
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if (rc) {
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CERROR("Error %d reading connection request from %pI4h\n",
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rc, &peer_ip);
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return -EIO;
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}
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if (flip)
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__swab64s(&cr.acr_nid);
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ni = lnet_net2ni(LNET_NIDNET(cr.acr_nid));
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if (!ni || /* no matching net */
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ni->ni_nid != cr.acr_nid) { /* right NET, wrong NID! */
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if (ni)
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lnet_ni_decref(ni);
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LCONSOLE_ERROR_MSG(0x120, "Refusing connection from %pI4h for %s: No matching NI\n",
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&peer_ip, libcfs_nid2str(cr.acr_nid));
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return -EPERM;
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}
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if (!ni->ni_lnd->lnd_accept) {
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/* This catches a request for the loopback LND */
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lnet_ni_decref(ni);
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LCONSOLE_ERROR_MSG(0x121, "Refusing connection from %pI4h for %s: NI doesn not accept IP connections\n",
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&peer_ip, libcfs_nid2str(cr.acr_nid));
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return -EPERM;
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}
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CDEBUG(D_NET, "Accept %s from %pI4h\n",
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libcfs_nid2str(cr.acr_nid), &peer_ip);
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rc = ni->ni_lnd->lnd_accept(ni, sock);
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lnet_ni_decref(ni);
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return rc;
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}
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static int
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lnet_acceptor(void *arg)
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{
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struct socket *newsock;
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int rc;
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__u32 magic;
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__u32 peer_ip;
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int peer_port;
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int secure = (int)((long_ptr_t)arg);
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LASSERT(!lnet_acceptor_state.pta_sock);
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cfs_block_allsigs();
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rc = lnet_sock_listen(&lnet_acceptor_state.pta_sock, 0, accept_port,
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accept_backlog);
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if (rc) {
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if (rc == -EADDRINUSE)
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LCONSOLE_ERROR_MSG(0x122, "Can't start acceptor on port %d: port already in use\n",
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accept_port);
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else
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LCONSOLE_ERROR_MSG(0x123, "Can't start acceptor on port %d: unexpected error %d\n",
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accept_port, rc);
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lnet_acceptor_state.pta_sock = NULL;
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} else {
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LCONSOLE(0, "Accept %s, port %d\n", accept_type, accept_port);
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}
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/* set init status and unblock parent */
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lnet_acceptor_state.pta_shutdown = rc;
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complete(&lnet_acceptor_state.pta_signal);
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if (rc)
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return rc;
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while (!lnet_acceptor_state.pta_shutdown) {
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rc = lnet_sock_accept(&newsock, lnet_acceptor_state.pta_sock);
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if (rc) {
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if (rc != -EAGAIN) {
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CWARN("Accept error %d: pausing...\n", rc);
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule_timeout(cfs_time_seconds(1));
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}
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continue;
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}
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/* maybe the LNet acceptor thread has been waken */
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if (lnet_acceptor_state.pta_shutdown) {
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sock_release(newsock);
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break;
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}
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rc = lnet_sock_getaddr(newsock, 1, &peer_ip, &peer_port);
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if (rc) {
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CERROR("Can't determine new connection's address\n");
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goto failed;
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}
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if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) {
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CERROR("Refusing connection from %pI4h: insecure port %d\n",
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&peer_ip, peer_port);
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goto failed;
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}
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rc = lnet_sock_read(newsock, &magic, sizeof(magic),
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accept_timeout);
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if (rc) {
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CERROR("Error %d reading connection request from %pI4h\n",
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rc, &peer_ip);
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goto failed;
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}
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rc = lnet_accept(newsock, magic);
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if (rc)
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goto failed;
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continue;
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failed:
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sock_release(newsock);
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}
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sock_release(lnet_acceptor_state.pta_sock);
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lnet_acceptor_state.pta_sock = NULL;
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CDEBUG(D_NET, "Acceptor stopping\n");
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/* unblock lnet_acceptor_stop() */
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complete(&lnet_acceptor_state.pta_signal);
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return 0;
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}
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static inline int
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accept2secure(const char *acc, long *sec)
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{
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if (!strcmp(acc, "secure")) {
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*sec = 1;
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return 1;
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} else if (!strcmp(acc, "all")) {
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*sec = 0;
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return 1;
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} else if (!strcmp(acc, "none")) {
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return 0;
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}
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LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n",
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acc);
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return -EINVAL;
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}
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int
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lnet_acceptor_start(void)
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{
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struct task_struct *task;
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int rc;
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long rc2;
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long secure;
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/* if acceptor is already running return immediately */
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if (!lnet_acceptor_state.pta_shutdown)
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return 0;
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LASSERT(!lnet_acceptor_state.pta_sock);
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rc = lnet_acceptor_get_tunables();
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if (rc)
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return rc;
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init_completion(&lnet_acceptor_state.pta_signal);
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rc = accept2secure(accept_type, &secure);
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if (rc <= 0)
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return rc;
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if (!lnet_count_acceptor_nis()) /* not required */
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return 0;
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task = kthread_run(lnet_acceptor, (void *)(ulong_ptr_t)secure,
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"acceptor_%03ld", secure);
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if (IS_ERR(task)) {
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rc2 = PTR_ERR(task);
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CERROR("Can't start acceptor thread: %ld\n", rc2);
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return -ESRCH;
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}
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/* wait for acceptor to startup */
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wait_for_completion(&lnet_acceptor_state.pta_signal);
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if (!lnet_acceptor_state.pta_shutdown) {
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/* started OK */
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LASSERT(lnet_acceptor_state.pta_sock);
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return 0;
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}
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LASSERT(!lnet_acceptor_state.pta_sock);
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return -ENETDOWN;
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}
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void
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lnet_acceptor_stop(void)
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{
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struct sock *sk;
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if (lnet_acceptor_state.pta_shutdown) /* not running */
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return;
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lnet_acceptor_state.pta_shutdown = 1;
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sk = lnet_acceptor_state.pta_sock->sk;
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/* awake any sleepers using safe method */
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sk->sk_state_change(sk);
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/* block until acceptor signals exit */
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wait_for_completion(&lnet_acceptor_state.pta_signal);
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}
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