freebsd-dev/sbin/ggate/ggatel/ggatel.c
Pawel Jakub Dawidek ab9092093c Because ggatel(8) operates on local GEOM providers, use unlimited queue size in
GEOM GATE to fix the issue described in r220264. This also means that we no
longer need -q option, remove it. Don't bother to leaving it as a no-op, as
ggatel(8) is just an example utility.
2011-04-02 06:59:05 +00:00

328 lines
7.6 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 <err.h>
#include <errno.h>
#include <assert.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/bio.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <geom/gate/g_gate.h>
#include "ggate.h"
enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
static const char *path = NULL;
static int unit = G_GATE_UNIT_AUTO;
static unsigned flags = 0;
static int force = 0;
static unsigned sectorsize = 0;
static unsigned timeout = G_GATE_TIMEOUT;
static void
usage(void)
{
fprintf(stderr, "usage: %s create [-v] [-o <ro|wo|rw>] "
"[-s sectorsize] [-t timeout] [-u unit] <path>\n", getprogname());
fprintf(stderr, " %s rescue [-v] [-o <ro|wo|rw>] <-u unit> "
"<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 int
g_gate_openflags(unsigned ggflags)
{
if ((ggflags & G_GATE_FLAG_READONLY) != 0)
return (O_RDONLY);
else if ((ggflags & G_GATE_FLAG_WRITEONLY) != 0)
return (O_WRONLY);
return (O_RDWR);
}
static void
g_gatel_serve(int fd)
{
struct g_gate_ctl_io ggio;
size_t bsize;
if (g_gate_verbose == 0) {
if (daemon(0, 0) == -1) {
g_gate_destroy(unit, 1);
err(EXIT_FAILURE, "Cannot daemonize");
}
}
g_gate_log(LOG_DEBUG, "Worker created: %u.", getpid());
ggio.gctl_version = G_GATE_VERSION;
ggio.gctl_unit = unit;
bsize = sectorsize;
ggio.gctl_data = malloc(bsize);
for (;;) {
int error;
once_again:
ggio.gctl_length = bsize;
ggio.gctl_error = 0;
g_gate_ioctl(G_GATE_CMD_START, &ggio);
error = ggio.gctl_error;
switch (error) {
case 0:
break;
case ECANCELED:
/* Exit gracefully. */
free(ggio.gctl_data);
g_gate_close_device();
close(fd);
exit(EXIT_SUCCESS);
case ENOMEM:
/* Buffer too small. */
assert(ggio.gctl_cmd == BIO_DELETE ||
ggio.gctl_cmd == BIO_WRITE);
ggio.gctl_data = realloc(ggio.gctl_data,
ggio.gctl_length);
if (ggio.gctl_data != NULL) {
bsize = ggio.gctl_length;
goto once_again;
}
/* FALLTHROUGH */
case ENXIO:
default:
g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME,
strerror(error));
}
error = 0;
switch (ggio.gctl_cmd) {
case BIO_READ:
if ((size_t)ggio.gctl_length > bsize) {
ggio.gctl_data = realloc(ggio.gctl_data,
ggio.gctl_length);
if (ggio.gctl_data != NULL)
bsize = ggio.gctl_length;
else
error = ENOMEM;
}
if (error == 0) {
if (pread(fd, ggio.gctl_data, ggio.gctl_length,
ggio.gctl_offset) == -1) {
error = errno;
}
}
break;
case BIO_DELETE:
case BIO_WRITE:
if (pwrite(fd, ggio.gctl_data, ggio.gctl_length,
ggio.gctl_offset) == -1) {
error = errno;
}
break;
default:
error = EOPNOTSUPP;
}
ggio.gctl_error = error;
g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
}
}
static void
g_gatel_create(void)
{
struct g_gate_ctl_create ggioc;
int fd;
fd = open(path, g_gate_openflags(flags) | O_DIRECT | O_FSYNC);
if (fd == -1)
err(EXIT_FAILURE, "Cannot open %s", path);
ggioc.gctl_version = G_GATE_VERSION;
ggioc.gctl_unit = unit;
ggioc.gctl_mediasize = g_gate_mediasize(fd);
if (sectorsize == 0)
sectorsize = g_gate_sectorsize(fd);
ggioc.gctl_sectorsize = sectorsize;
ggioc.gctl_timeout = timeout;
ggioc.gctl_flags = flags;
ggioc.gctl_maxcount = 0;
strlcpy(ggioc.gctl_info, path, sizeof(ggioc.gctl_info));
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;
g_gatel_serve(fd);
}
static void
g_gatel_rescue(void)
{
struct g_gate_ctl_cancel ggioc;
int fd;
fd = open(path, g_gate_openflags(flags));
if (fd == -1)
err(EXIT_FAILURE, "Cannot open %s", path);
ggioc.gctl_version = G_GATE_VERSION;
ggioc.gctl_unit = unit;
ggioc.gctl_seq = 0;
g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc);
g_gatel_serve(fd);
}
int
main(int argc, char *argv[])
{
if (argc < 2)
usage();
if (strcasecmp(argv[1], "create") == 0)
action = CREATE;
else if (strcasecmp(argv[1], "rescue") == 0)
action = RESCUE;
else if (strcasecmp(argv[1], "destroy") == 0)
action = DESTROY;
else if (strcasecmp(argv[1], "list") == 0)
action = LIST;
else
usage();
argc -= 1;
argv += 1;
for (;;) {
int ch;
ch = getopt(argc, argv, "fo:s:t:u:v");
if (ch == -1)
break;
switch (ch) {
case 'f':
if (action != DESTROY)
usage();
force = 1;
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 '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 != 1)
usage();
g_gate_load_module();
g_gate_open_device();
path = argv[0];
g_gatel_create();
break;
case RESCUE:
if (argc != 1)
usage();
if (unit == -1) {
fprintf(stderr, "Required unit number.\n");
usage();
}
g_gate_open_device();
path = argv[0];
g_gatel_rescue();
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 UNSET:
default:
usage();
}
g_gate_close_device();
exit(EXIT_SUCCESS);
}