freebsd-skq/sbin/ggate/ggatec/ggatec.c
Pawel Jakub Dawidek 32115b105a Please welcome HAST - Highly Avalable Storage.
HAST allows to transparently store data on two physically separated machines
connected over the TCP/IP network. HAST works in Primary-Secondary
(Master-Backup, Master-Slave) configuration, which means that only one of the
cluster nodes can be active at any given time. Only Primary node is able to
handle I/O requests to HAST-managed devices. Currently HAST is limited to two
cluster nodes in total.

HAST operates on block level - it provides disk-like devices in /dev/hast/
directory for use by file systems and/or applications. Working on block level
makes it transparent for file systems and applications. There in no difference
between using HAST-provided device and raw disk, partition, etc. All of them
are just regular GEOM providers in FreeBSD.

For more information please consult hastd(8), hastctl(8) and hast.conf(5)
manual pages, as well as http://wiki.FreeBSD.org/HAST.

Sponsored by:	FreeBSD Foundation
Sponsored by:	OMCnet Internet Service GmbH
Sponsored by:	TransIP BV
2010-02-18 23:16:19 +00:00

643 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 = G_GATE_UNIT_AUTO;
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);
fflush(stdout);
}
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);
}