freebsd-dev/sbin/ggate/ggatec/ggatec.c
Pawel Jakub Dawidek 7be67fe3d1 Reimplement ggatec/ggated applications.
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)
2005-07-08 21:28:26 +00:00

641 lines
15 KiB
C

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