ggatel.c revision 241720
1/*- 2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sbin/ggate/ggatel/ggatel.c 241720 2012-10-19 05:43:38Z ed $ 27 */ 28 29#include <stdio.h> 30#include <stdlib.h> 31#include <stdint.h> 32#include <fcntl.h> 33#include <unistd.h> 34#include <string.h> 35#include <err.h> 36#include <errno.h> 37#include <assert.h> 38#include <sys/param.h> 39#include <sys/time.h> 40#include <sys/bio.h> 41#include <sys/disk.h> 42#include <sys/ioctl.h> 43#include <sys/stat.h> 44#include <sys/syslog.h> 45 46#include <geom/gate/g_gate.h> 47#include "ggate.h" 48 49 50static enum { UNSET, CREATE, DESTROY, LIST, RESCUE } action = UNSET; 51 52static const char *path = NULL; 53static int unit = G_GATE_UNIT_AUTO; 54static unsigned flags = 0; 55static int force = 0; 56static unsigned sectorsize = 0; 57static unsigned timeout = G_GATE_TIMEOUT; 58 59static void 60usage(void) 61{ 62 63 fprintf(stderr, "usage: %s create [-v] [-o <ro|wo|rw>] " 64 "[-s sectorsize] [-t timeout] [-u unit] <path>\n", getprogname()); 65 fprintf(stderr, " %s rescue [-v] [-o <ro|wo|rw>] <-u unit> " 66 "<path>\n", getprogname()); 67 fprintf(stderr, " %s destroy [-f] <-u unit>\n", getprogname()); 68 fprintf(stderr, " %s list [-v] [-u unit]\n", getprogname()); 69 exit(EXIT_FAILURE); 70} 71 72static int 73g_gate_openflags(unsigned ggflags) 74{ 75 76 if ((ggflags & G_GATE_FLAG_READONLY) != 0) 77 return (O_RDONLY); 78 else if ((ggflags & G_GATE_FLAG_WRITEONLY) != 0) 79 return (O_WRONLY); 80 return (O_RDWR); 81} 82 83static void 84g_gatel_serve(int fd) 85{ 86 struct g_gate_ctl_io ggio; 87 size_t bsize; 88 89 if (g_gate_verbose == 0) { 90 if (daemon(0, 0) == -1) { 91 g_gate_destroy(unit, 1); 92 err(EXIT_FAILURE, "Cannot daemonize"); 93 } 94 } 95 g_gate_log(LOG_DEBUG, "Worker created: %u.", getpid()); 96 ggio.gctl_version = G_GATE_VERSION; 97 ggio.gctl_unit = unit; 98 bsize = sectorsize; 99 ggio.gctl_data = malloc(bsize); 100 for (;;) { 101 int error; 102once_again: 103 ggio.gctl_length = bsize; 104 ggio.gctl_error = 0; 105 g_gate_ioctl(G_GATE_CMD_START, &ggio); 106 error = ggio.gctl_error; 107 switch (error) { 108 case 0: 109 break; 110 case ECANCELED: 111 /* Exit gracefully. */ 112 free(ggio.gctl_data); 113 g_gate_close_device(); 114 close(fd); 115 exit(EXIT_SUCCESS); 116 case ENOMEM: 117 /* Buffer too small. */ 118 assert(ggio.gctl_cmd == BIO_DELETE || 119 ggio.gctl_cmd == BIO_WRITE); 120 ggio.gctl_data = realloc(ggio.gctl_data, 121 ggio.gctl_length); 122 if (ggio.gctl_data != NULL) { 123 bsize = ggio.gctl_length; 124 goto once_again; 125 } 126 /* FALLTHROUGH */ 127 case ENXIO: 128 default: 129 g_gate_xlog("ioctl(/dev/%s): %s.", G_GATE_CTL_NAME, 130 strerror(error)); 131 } 132 133 error = 0; 134 switch (ggio.gctl_cmd) { 135 case BIO_READ: 136 if ((size_t)ggio.gctl_length > bsize) { 137 ggio.gctl_data = realloc(ggio.gctl_data, 138 ggio.gctl_length); 139 if (ggio.gctl_data != NULL) 140 bsize = ggio.gctl_length; 141 else 142 error = ENOMEM; 143 } 144 if (error == 0) { 145 if (pread(fd, ggio.gctl_data, ggio.gctl_length, 146 ggio.gctl_offset) == -1) { 147 error = errno; 148 } 149 } 150 break; 151 case BIO_DELETE: 152 case BIO_WRITE: 153 if (pwrite(fd, ggio.gctl_data, ggio.gctl_length, 154 ggio.gctl_offset) == -1) { 155 error = errno; 156 } 157 break; 158 default: 159 error = EOPNOTSUPP; 160 } 161 162 ggio.gctl_error = error; 163 g_gate_ioctl(G_GATE_CMD_DONE, &ggio); 164 } 165} 166 167static void 168g_gatel_create(void) 169{ 170 struct g_gate_ctl_create ggioc; 171 int fd; 172 173 fd = open(path, g_gate_openflags(flags) | O_DIRECT | O_FSYNC); 174 if (fd == -1) 175 err(EXIT_FAILURE, "Cannot open %s", path); 176 ggioc.gctl_version = G_GATE_VERSION; 177 ggioc.gctl_unit = unit; 178 ggioc.gctl_mediasize = g_gate_mediasize(fd); 179 if (sectorsize == 0) 180 sectorsize = g_gate_sectorsize(fd); 181 ggioc.gctl_sectorsize = sectorsize; 182 ggioc.gctl_timeout = timeout; 183 ggioc.gctl_flags = flags; 184 ggioc.gctl_maxcount = 0; 185 strlcpy(ggioc.gctl_info, path, sizeof(ggioc.gctl_info)); 186 g_gate_ioctl(G_GATE_CMD_CREATE, &ggioc); 187 if (unit == -1) 188 printf("%s%u\n", G_GATE_PROVIDER_NAME, ggioc.gctl_unit); 189 unit = ggioc.gctl_unit; 190 g_gatel_serve(fd); 191} 192 193static void 194g_gatel_rescue(void) 195{ 196 struct g_gate_ctl_cancel ggioc; 197 int fd; 198 199 fd = open(path, g_gate_openflags(flags)); 200 if (fd == -1) 201 err(EXIT_FAILURE, "Cannot open %s", path); 202 203 ggioc.gctl_version = G_GATE_VERSION; 204 ggioc.gctl_unit = unit; 205 ggioc.gctl_seq = 0; 206 g_gate_ioctl(G_GATE_CMD_CANCEL, &ggioc); 207 208 g_gatel_serve(fd); 209} 210 211int 212main(int argc, char *argv[]) 213{ 214 215 if (argc < 2) 216 usage(); 217 if (strcasecmp(argv[1], "create") == 0) 218 action = CREATE; 219 else if (strcasecmp(argv[1], "rescue") == 0) 220 action = RESCUE; 221 else if (strcasecmp(argv[1], "destroy") == 0) 222 action = DESTROY; 223 else if (strcasecmp(argv[1], "list") == 0) 224 action = LIST; 225 else 226 usage(); 227 argc -= 1; 228 argv += 1; 229 for (;;) { 230 int ch; 231 232 ch = getopt(argc, argv, "fo:s:t:u:v"); 233 if (ch == -1) 234 break; 235 switch (ch) { 236 case 'f': 237 if (action != DESTROY) 238 usage(); 239 force = 1; 240 break; 241 case 'o': 242 if (action != CREATE && action != RESCUE) 243 usage(); 244 if (strcasecmp("ro", optarg) == 0) 245 flags = G_GATE_FLAG_READONLY; 246 else if (strcasecmp("wo", optarg) == 0) 247 flags = G_GATE_FLAG_WRITEONLY; 248 else if (strcasecmp("rw", optarg) == 0) 249 flags = 0; 250 else { 251 errx(EXIT_FAILURE, 252 "Invalid argument for '-o' option."); 253 } 254 break; 255 case 's': 256 if (action != CREATE) 257 usage(); 258 errno = 0; 259 sectorsize = strtoul(optarg, NULL, 10); 260 if (sectorsize == 0 && errno != 0) 261 errx(EXIT_FAILURE, "Invalid sectorsize."); 262 break; 263 case 't': 264 if (action != CREATE) 265 usage(); 266 errno = 0; 267 timeout = strtoul(optarg, NULL, 10); 268 if (timeout == 0 && errno != 0) 269 errx(EXIT_FAILURE, "Invalid timeout."); 270 break; 271 case 'u': 272 errno = 0; 273 unit = strtol(optarg, NULL, 10); 274 if (unit == 0 && errno != 0) 275 errx(EXIT_FAILURE, "Invalid unit number."); 276 break; 277 case 'v': 278 if (action == DESTROY) 279 usage(); 280 g_gate_verbose++; 281 break; 282 default: 283 usage(); 284 } 285 } 286 argc -= optind; 287 argv += optind; 288 289 switch (action) { 290 case CREATE: 291 if (argc != 1) 292 usage(); 293 g_gate_load_module(); 294 g_gate_open_device(); 295 path = argv[0]; 296 g_gatel_create(); 297 break; 298 case RESCUE: 299 if (argc != 1) 300 usage(); 301 if (unit == -1) { 302 fprintf(stderr, "Required unit number.\n"); 303 usage(); 304 } 305 g_gate_open_device(); 306 path = argv[0]; 307 g_gatel_rescue(); 308 break; 309 case DESTROY: 310 if (unit == -1) { 311 fprintf(stderr, "Required unit number.\n"); 312 usage(); 313 } 314 g_gate_verbose = 1; 315 g_gate_open_device(); 316 g_gate_destroy(unit, force); 317 break; 318 case LIST: 319 g_gate_list(unit, g_gate_verbose); 320 break; 321 case UNSET: 322 default: 323 usage(); 324 } 325 g_gate_close_device(); 326 exit(EXIT_SUCCESS); 327} 328