'struct g_gate_ctl_create' fields. While the behaviour was technically undefined on other architectures as well, on the reporter's amd64 systems the uninitialized bytes the kernel cares about were always zero so everything worked as expected. PR: 197309, 199559 Submitted by: ota@j.email.ne.jp, Fabian Keil Reviewed by: pjd MFC after: 1 week
329 lines
7.7 KiB
C
329 lines
7.7 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 <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/time.h>
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#include <sys/bio.h>
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#include <sys/disk.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/syslog.h>
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#include <geom/gate/g_gate.h>
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#include "ggate.h"
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static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET;
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static const char *path = NULL;
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static int unit = G_GATE_UNIT_AUTO;
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static unsigned flags = 0;
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static int force = 0;
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static unsigned sectorsize = 0;
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static unsigned timeout = G_GATE_TIMEOUT;
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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 [-v] [-o <ro|wo|rw>] "
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"[-s sectorsize] [-t timeout] [-u unit] <path>\n", getprogname());
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fprintf(stderr, " %s rescue [-v] [-o <ro|wo|rw>] <-u unit> "
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"<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 int
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g_gate_openflags(unsigned ggflags)
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{
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if ((ggflags & G_GATE_FLAG_READONLY) != 0)
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return (O_RDONLY);
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else if ((ggflags & G_GATE_FLAG_WRITEONLY) != 0)
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return (O_WRONLY);
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return (O_RDWR);
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}
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static void
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g_gatel_serve(int fd)
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{
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struct g_gate_ctl_io ggio;
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size_t bsize;
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if (g_gate_verbose == 0) {
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if (daemon(0, 0) == -1) {
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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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}
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g_gate_log(LOG_DEBUG, "Worker created: %u.", getpid());
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ggio.gctl_version = G_GATE_VERSION;
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ggio.gctl_unit = unit;
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bsize = sectorsize;
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ggio.gctl_data = malloc(bsize);
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for (;;) {
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int error;
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once_again:
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ggio.gctl_length = bsize;
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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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/* Exit gracefully. */
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free(ggio.gctl_data);
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g_gate_close_device();
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close(fd);
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exit(EXIT_SUCCESS);
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case ENOMEM:
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/* Buffer too small. */
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assert(ggio.gctl_cmd == BIO_DELETE ||
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ggio.gctl_cmd == BIO_WRITE);
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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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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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error = 0;
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switch (ggio.gctl_cmd) {
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case BIO_READ:
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if ((size_t)ggio.gctl_length > bsize) {
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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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else
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error = ENOMEM;
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}
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if (error == 0) {
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if (pread(fd, ggio.gctl_data, ggio.gctl_length,
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ggio.gctl_offset) == -1) {
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error = errno;
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}
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}
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break;
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case BIO_DELETE:
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case BIO_WRITE:
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if (pwrite(fd, ggio.gctl_data, ggio.gctl_length,
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ggio.gctl_offset) == -1) {
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error = errno;
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}
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break;
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default:
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error = EOPNOTSUPP;
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}
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ggio.gctl_error = error;
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g_gate_ioctl(G_GATE_CMD_DONE, &ggio);
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}
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}
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static void
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g_gatel_create(void)
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{
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struct g_gate_ctl_create ggioc;
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int fd;
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fd = open(path, g_gate_openflags(flags) | O_DIRECT | O_FSYNC);
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if (fd == -1)
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err(EXIT_FAILURE, "Cannot open %s", path);
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memset(&ggioc, 0, sizeof(ggioc));
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ggioc.gctl_version = G_GATE_VERSION;
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ggioc.gctl_unit = unit;
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ggioc.gctl_mediasize = g_gate_mediasize(fd);
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if (sectorsize == 0)
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sectorsize = g_gate_sectorsize(fd);
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ggioc.gctl_sectorsize = sectorsize;
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ggioc.gctl_timeout = timeout;
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ggioc.gctl_flags = flags;
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ggioc.gctl_maxcount = 0;
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strlcpy(ggioc.gctl_info, path, sizeof(ggioc.gctl_info));
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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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g_gatel_serve(fd);
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}
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static void
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g_gatel_rescue(void)
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{
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struct g_gate_ctl_cancel ggioc;
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int fd;
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fd = open(path, g_gate_openflags(flags));
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if (fd == -1)
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err(EXIT_FAILURE, "Cannot open %s", path);
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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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g_gatel_serve(fd);
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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], "rescue") == 0)
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action = RESCUE;
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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
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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, "fo: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 '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 '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 != 1)
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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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path = argv[0];
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g_gatel_create();
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break;
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case RESCUE:
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if (argc != 1)
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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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path = argv[0];
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g_gatel_rescue();
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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 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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