Change communication protocol to be much more resistant on network problems and to allow for much better performance. Better performance is achieved by creating two connections between ggatec and ggated one for sending the data and one for receiving it. Every connection is handled by separeted thread, so there is no more synchronous data flow (send and wait for response), now one threads sends all requests and another receives the data. Use two threads in ggatec(8): - sendtd, which takes I/O requests from the kernel and sends them to the ggated daemon on the other end; - recvtd, which waits for ggated responses and forwards them to the kernel. Use three threads in ggated(8): - recvtd, which waits for I/O requests and puts them onto incoming queue; - disktd, which takes requests from the incoming queue, does disk operations and puts finished requests onto outgoing queue; - sendtd, which takes finished requests from the outgoing queue and sends responses back to ggatec. Because there were major changes in communication protocol, there is no backward compatibility, from now on, both client and server has to run on 5.x or 6.x (or at least ggated should be from the same FreeBSD version on which ggatec is running). For Gbit networks some buffers need to be increased. I use those settings: kern.ipc.maxsockbuf=16777216 net.inet.tcp.sendspace=8388608 net.inet.tcp.recvspace=8388608 and I use '-S 4194304 -R 4194304' options for both, ggatec and ggated. Approved by: re (scottl)
641 lines
15 KiB
C
641 lines
15 KiB
C
/*-
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <libgen.h>
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#include <pthread.h>
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#include <signal.h>
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#include <err.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/time.h>
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#include <sys/bio.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <geom/gate/g_gate.h>
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#include "ggate.h"
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enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
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static const char *path = NULL;
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static const char *host = NULL;
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static int unit = -1;
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static unsigned flags = 0;
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static int force = 0;
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static unsigned queue_size = G_GATE_QUEUE_SIZE;
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static unsigned port = G_GATE_PORT;
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static off_t mediasize;
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static unsigned sectorsize = 0;
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static unsigned timeout = G_GATE_TIMEOUT;
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static int sendfd, recvfd;
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static uint32_t token;
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static pthread_t sendtd, recvtd;
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static int reconnect;
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s create [-nv] [-o <ro|wo|rw>] [-p port] "
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"[-q queue_size] [-R rcvbuf] [-S sndbuf] [-s sectorsize] "
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"[-t timeout] [-u unit] <host> <path>\n", getprogname());
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fprintf(stderr, " %s rescue [-nv] [-o <ro|wo|rw>] [-p port] "
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"[-R rcvbuf] [-S sndbuf] <-u unit> <host> <path>\n", getprogname());
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fprintf(stderr, " %s destroy [-f] <-u unit>\n", getprogname());
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fprintf(stderr, " %s list [-v] [-u unit]\n", getprogname());
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exit(EXIT_FAILURE);
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}
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static void *
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send_thread(void *arg __unused)
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{
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struct g_gate_ctl_io ggio;
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struct g_gate_hdr hdr;
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char buf[MAXPHYS];
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ssize_t data;
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int error;
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g_gate_log(LOG_NOTICE, "%s: started!", __func__);
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ggio.gctl_version = G_GATE_VERSION;
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ggio.gctl_unit = unit;
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ggio.gctl_data = buf;
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for (;;) {
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ggio.gctl_length = sizeof(buf);
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ggio.gctl_error = 0;
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g_gate_ioctl(G_GATE_CMD_START, &ggio);
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error = ggio.gctl_error;
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switch (error) {
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case 0:
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break;
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case ECANCELED:
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if (reconnect)
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break;
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/* Exit gracefully. */
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g_gate_close_device();
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exit(EXIT_SUCCESS);
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#if 0
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case ENOMEM:
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/* Buffer too small. */
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ggio.gctl_data = realloc(ggio.gctl_data,
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ggio.gctl_length);
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if (ggio.gctl_data != NULL) {
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bsize = ggio.gctl_length;
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goto once_again;
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}
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/* FALLTHROUGH */
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#endif
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case ENXIO:
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default:
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g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME,
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strerror(error));
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}
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if (reconnect)
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break;
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switch (ggio.gctl_cmd) {
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case BIO_READ:
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hdr.gh_cmd = GGATE_CMD_READ;
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break;
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case BIO_WRITE:
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hdr.gh_cmd = GGATE_CMD_WRITE;
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break;
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}
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hdr.gh_seq = ggio.gctl_seq;
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hdr.gh_offset = ggio.gctl_offset;
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hdr.gh_length = ggio.gctl_length;
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hdr.gh_error = 0;
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g_gate_swap2n_hdr(&hdr);
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data = g_gate_send(sendfd, &hdr, sizeof(hdr), MSG_NOSIGNAL);
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g_gate_log(LOG_DEBUG, "Sent hdr packet.");
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g_gate_swap2h_hdr(&hdr);
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if (reconnect)
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break;
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if (data != sizeof(hdr)) {
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g_gate_log(LOG_ERR, "Lost connection 1.");
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reconnect = 1;
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pthread_kill(recvtd, SIGUSR1);
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break;
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}
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if (hdr.gh_cmd == GGATE_CMD_WRITE) {
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data = g_gate_send(sendfd, ggio.gctl_data,
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ggio.gctl_length, MSG_NOSIGNAL);
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if (reconnect)
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break;
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if (data != ggio.gctl_length) {
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g_gate_log(LOG_ERR, "Lost connection 2 (%zd != %zd).", data, (ssize_t)ggio.gctl_length);
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reconnect = 1;
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pthread_kill(recvtd, SIGUSR1);
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break;
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}
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g_gate_log(LOG_DEBUG, "Sent %zd bytes (offset=%llu, "
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"size=%u).", data, hdr.gh_offset, hdr.gh_length);
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}
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}
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g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
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return (NULL);
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}
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static void *
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recv_thread(void *arg __unused)
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{
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struct g_gate_ctl_io ggio;
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struct g_gate_hdr hdr;
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char buf[MAXPHYS];
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ssize_t data;
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g_gate_log(LOG_NOTICE, "%s: started!", __func__);
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ggio.gctl_version = G_GATE_VERSION;
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ggio.gctl_unit = unit;
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ggio.gctl_data = buf;
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for (;;) {
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data = g_gate_recv(recvfd, &hdr, sizeof(hdr), MSG_WAITALL);
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if (reconnect)
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break;
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g_gate_swap2h_hdr(&hdr);
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if (data != sizeof(hdr)) {
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if (data == -1 && errno == EAGAIN)
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continue;
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g_gate_log(LOG_ERR, "Lost connection 3.");
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reconnect = 1;
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pthread_kill(sendtd, SIGUSR1);
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break;
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}
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g_gate_log(LOG_DEBUG, "Received hdr packet.");
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ggio.gctl_seq = hdr.gh_seq;
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ggio.gctl_cmd = hdr.gh_cmd;
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ggio.gctl_offset = hdr.gh_offset;
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ggio.gctl_length = hdr.gh_length;
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ggio.gctl_error = hdr.gh_error;
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if (ggio.gctl_error == 0 && ggio.gctl_cmd == GGATE_CMD_READ) {
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data = g_gate_recv(recvfd, ggio.gctl_data,
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ggio.gctl_length, MSG_WAITALL);
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if (reconnect)
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break;
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g_gate_log(LOG_DEBUG, "Received data packet.");
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if (data != ggio.gctl_length) {
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g_gate_log(LOG_ERR, "Lost connection 4.");
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reconnect = 1;
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pthread_kill(sendtd, SIGUSR1);
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break;
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}
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g_gate_log(LOG_DEBUG, "Received %d bytes (offset=%ju, "
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"size=%zu).", data, (uintmax_t)hdr.gh_offset,
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(size_t)hdr.gh_length);
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}
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g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
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}
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g_gate_log(LOG_DEBUG, "%s: Died.", __func__);
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pthread_exit(NULL);
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}
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static int
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handshake(int dir)
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{
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struct g_gate_version ver;
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struct g_gate_cinit cinit;
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struct g_gate_sinit sinit;
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struct sockaddr_in serv;
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int sfd;
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/*
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* Do the network stuff.
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*/
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bzero(&serv, sizeof(serv));
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serv.sin_family = AF_INET;
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serv.sin_addr.s_addr = g_gate_str2ip(host);
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if (serv.sin_addr.s_addr == INADDR_NONE) {
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g_gate_log(LOG_DEBUG, "Invalid IP/host name: %s.", host);
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return (-1);
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}
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serv.sin_port = htons(port);
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sfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sfd == -1) {
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g_gate_log(LOG_DEBUG, "Cannot open socket: %s.",
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strerror(errno));
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return (-1);
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}
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g_gate_socket_settings(sfd);
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if (connect(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1) {
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g_gate_log(LOG_DEBUG, "Cannot connect to server: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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g_gate_log(LOG_INFO, "Connected to the server: %s:%d.", host, port);
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/*
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* Create and send version packet.
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*/
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g_gate_log(LOG_DEBUG, "Sending version packet.");
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assert(strlen(GGATE_MAGIC) == sizeof(ver.gv_magic));
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bcopy(GGATE_MAGIC, ver.gv_magic, sizeof(ver.gv_magic));
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ver.gv_version = GGATE_VERSION;
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ver.gv_error = 0;
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g_gate_swap2n_version(&ver);
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if (g_gate_send(sfd, &ver, sizeof(ver), MSG_NOSIGNAL) == -1) {
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g_gate_log(LOG_DEBUG, "Error while sending version packet: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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bzero(&ver, sizeof(ver));
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if (g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL) == -1) {
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g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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if (ver.gv_error != 0) {
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g_gate_log(LOG_DEBUG, "Version verification problem: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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/*
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* Create and send initial packet.
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*/
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g_gate_log(LOG_DEBUG, "Sending initial packet.");
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if (strlcpy(cinit.gc_path, path, sizeof(cinit.gc_path)) >=
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sizeof(cinit.gc_path)) {
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g_gate_log(LOG_DEBUG, "Path name too long.");
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close(sfd);
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return (-1);
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}
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cinit.gc_flags = flags | dir;
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cinit.gc_token = token;
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cinit.gc_nconn = 2;
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g_gate_swap2n_cinit(&cinit);
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if (g_gate_send(sfd, &cinit, sizeof(cinit), MSG_NOSIGNAL) == -1) {
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g_gate_log(LOG_DEBUG, "Error while sending initial packet: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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g_gate_swap2h_cinit(&cinit);
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/*
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* Receiving initial packet from server.
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*/
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g_gate_log(LOG_DEBUG, "Receiving initial packet.");
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if (g_gate_recv(sfd, &sinit, sizeof(sinit), MSG_WAITALL) == -1) {
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g_gate_log(LOG_DEBUG, "Error while receiving data: %s.",
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strerror(errno));
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close(sfd);
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return (-1);
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}
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g_gate_swap2h_sinit(&sinit);
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if (sinit.gs_error != 0) {
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g_gate_log(LOG_DEBUG, "Error from server: %s.",
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strerror(sinit.gs_error));
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close(sfd);
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return (-1);
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}
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g_gate_log(LOG_DEBUG, "Received initial packet.");
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mediasize = sinit.gs_mediasize;
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if (sectorsize == 0)
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sectorsize = sinit.gs_sectorsize;
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return (sfd);
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}
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static void
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mydaemon(void)
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{
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if (g_gate_verbose > 0)
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return;
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if (daemon(0, 0) == 0)
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return;
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if (action == CREATE)
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g_gate_destroy(unit, 1);
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err(EXIT_FAILURE, "Cannot daemonize");
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}
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static int
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g_gatec_connect(void)
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{
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token = arc4random();
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/*
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* Our receive descriptor is connected to the send descriptor on the
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* server side.
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*/
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recvfd = handshake(GGATE_FLAG_SEND);
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if (recvfd == -1)
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return (0);
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/*
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* Our send descriptor is connected to the receive descriptor on the
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* server side.
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*/
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sendfd = handshake(GGATE_FLAG_RECV);
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if (sendfd == -1)
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return (0);
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return (1);
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}
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static void
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g_gatec_start(void)
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{
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int error;
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reconnect = 0;
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error = pthread_create(&recvtd, NULL, recv_thread, NULL);
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if (error != 0) {
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g_gate_destroy(unit, 1);
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g_gate_xlog("pthread_create(recv_thread): %s.",
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strerror(error));
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}
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sendtd = pthread_self();
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send_thread(NULL);
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/* Disconnected. */
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close(sendfd);
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close(recvfd);
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}
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static void
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signop(int sig __unused)
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{
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/* Do nothing. */
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}
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static void
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g_gatec_loop(void)
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{
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struct g_gate_ctl_cancel ggioc;
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signal(SIGUSR1, signop);
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for (;;) {
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g_gatec_start();
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g_gate_log(LOG_NOTICE, "Disconnected [%s %s]. Connecting...",
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host, path);
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while (!g_gatec_connect()) {
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sleep(2);
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g_gate_log(LOG_NOTICE, "Connecting [%s %s]...", host,
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path);
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}
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ggioc.gctl_version = G_GATE_VERSION;
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ggioc.gctl_unit = unit;
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ggioc.gctl_seq = 0;
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g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
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}
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}
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static void
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g_gatec_create(void)
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{
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struct g_gate_ctl_create ggioc;
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if (!g_gatec_connect())
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g_gate_xlog("Cannot connect: %s.", strerror(errno));
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/*
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* Ok, got both sockets, time to create provider.
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*/
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ggioc.gctl_version = G_GATE_VERSION;
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ggioc.gctl_mediasize = mediasize;
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ggioc.gctl_sectorsize = sectorsize;
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ggioc.gctl_flags = flags;
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ggioc.gctl_maxcount = queue_size;
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ggioc.gctl_timeout = timeout;
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ggioc.gctl_unit = unit;
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snprintf(ggioc.gctl_info, sizeof(ggioc.gctl_info), "%s:%u %s", host,
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port, path);
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g_gate_ioctl(G_GATE_CMD_CREATE, &ggioc);
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if (unit == -1)
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printf("%s%u\n", G_GATE_PROVIDER_NAME, ggioc.gctl_unit);
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unit = ggioc.gctl_unit;
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mydaemon();
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g_gatec_loop();
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}
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static void
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g_gatec_rescue(void)
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{
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struct g_gate_ctl_cancel ggioc;
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if (!g_gatec_connect())
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g_gate_xlog("Cannot connect: %s.", strerror(errno));
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ggioc.gctl_version = G_GATE_VERSION;
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ggioc.gctl_unit = unit;
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ggioc.gctl_seq = 0;
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g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
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mydaemon();
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g_gatec_loop();
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}
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int
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main(int argc, char *argv[])
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{
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if (argc < 2)
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usage();
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if (strcasecmp(argv[1], "create") == 0)
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action = CREATE;
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else if (strcasecmp(argv[1], "destroy") == 0)
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action = DESTROY;
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else if (strcasecmp(argv[1], "list") == 0)
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action = LIST;
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else if (strcasecmp(argv[1], "rescue") == 0)
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action = RESCUE;
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else
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usage();
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argc -= 1;
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argv += 1;
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for (;;) {
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int ch;
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ch = getopt(argc, argv, "fno:p:q:R:S:s:t:u:v");
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if (ch == -1)
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break;
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switch (ch) {
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case 'f':
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if (action != DESTROY)
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usage();
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force = 1;
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break;
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case 'n':
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if (action != CREATE && action != RESCUE)
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usage();
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nagle = 0;
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break;
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case 'o':
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if (action != CREATE && action != RESCUE)
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usage();
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if (strcasecmp("ro", optarg) == 0)
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flags = G_GATE_FLAG_READONLY;
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else if (strcasecmp("wo", optarg) == 0)
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flags = G_GATE_FLAG_WRITEONLY;
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else if (strcasecmp("rw", optarg) == 0)
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flags = 0;
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else {
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errx(EXIT_FAILURE,
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"Invalid argument for '-o' option.");
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}
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break;
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case 'p':
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if (action != CREATE && action != RESCUE)
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usage();
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errno = 0;
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port = strtoul(optarg, NULL, 10);
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if (port == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid port.");
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break;
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case 'q':
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if (action != CREATE)
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usage();
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errno = 0;
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queue_size = strtoul(optarg, NULL, 10);
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if (queue_size == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid queue_size.");
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break;
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case 'R':
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if (action != CREATE && action != RESCUE)
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usage();
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errno = 0;
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rcvbuf = strtoul(optarg, NULL, 10);
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if (rcvbuf == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid rcvbuf.");
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break;
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case 'S':
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if (action != CREATE && action != RESCUE)
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usage();
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errno = 0;
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sndbuf = strtoul(optarg, NULL, 10);
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if (sndbuf == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid sndbuf.");
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break;
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case 's':
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if (action != CREATE)
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usage();
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errno = 0;
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sectorsize = strtoul(optarg, NULL, 10);
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if (sectorsize == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid sectorsize.");
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break;
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case 't':
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if (action != CREATE)
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usage();
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errno = 0;
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timeout = strtoul(optarg, NULL, 10);
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if (timeout == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid timeout.");
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break;
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case 'u':
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errno = 0;
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unit = strtol(optarg, NULL, 10);
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if (unit == 0 && errno != 0)
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errx(EXIT_FAILURE, "Invalid unit number.");
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break;
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case 'v':
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if (action == DESTROY)
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usage();
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g_gate_verbose++;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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switch (action) {
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case CREATE:
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if (argc != 2)
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usage();
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g_gate_load_module();
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g_gate_open_device();
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host = argv[0];
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path = argv[1];
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g_gatec_create();
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break;
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case DESTROY:
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if (unit == -1) {
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fprintf(stderr, "Required unit number.\n");
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usage();
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}
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g_gate_verbose = 1;
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g_gate_open_device();
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g_gate_destroy(unit, force);
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break;
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case LIST:
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g_gate_list(unit, g_gate_verbose);
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break;
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case RESCUE:
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if (argc != 2)
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usage();
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if (unit == -1) {
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fprintf(stderr, "Required unit number.\n");
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usage();
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}
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g_gate_open_device();
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host = argv[0];
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path = argv[1];
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g_gatec_rescue();
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break;
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case UNSET:
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default:
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usage();
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}
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g_gate_close_device();
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exit(EXIT_SUCCESS);
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}
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