extras/multipath/main.c

   1 /*
   2  * Soft:        Description here...
   3  *
   4  * Version:     $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
   5  *
   6  * Author:      Copyright (C) 2003 Christophe Varoqui
   7  *
   8  *              This program is distributed in the hope that it will be useful,
   9  *              but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *              MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *              See the GNU General Public License for more details.
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <linux/kdev_t.h>
  26 #include <string.h>
  27 #include <sys/ioctl.h>
  28 #include <libsysfs.h>
  29 #include "libdevmapper/libdevmapper.h"
  30 #include "main.h"
  31
  32 static int
  33 do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
  34        void *resp, int mx_resp_len, int noisy)
  35 {
  36         unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
  37             { INQUIRY_CMD, 0, 0, 0, 0, 0 };
  38         unsigned char sense_b[SENSE_BUFF_LEN];
  39         struct sg_io_hdr io_hdr;
  40
  41         if (cmddt)
  42                 inqCmdBlk[1] |= 2;
  43         if (evpd)
  44                 inqCmdBlk[1] |= 1;
  45         inqCmdBlk[2] = (unsigned char) pg_op;
  46         inqCmdBlk[4] = (unsigned char) mx_resp_len;
  47         memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
  48         io_hdr.interface_id = 'S';
  49         io_hdr.cmd_len = sizeof (inqCmdBlk);
  50         io_hdr.mx_sb_len = sizeof (sense_b);
  51         io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
  52         io_hdr.dxfer_len = mx_resp_len;
  53         io_hdr.dxferp = resp;
  54         io_hdr.cmdp = inqCmdBlk;
  55         io_hdr.sbp = sense_b;
  56         io_hdr.timeout = DEF_TIMEOUT;
  57
  58         if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
  59                 perror("SG_IO (inquiry) error");
  60                 return -1;
  61         }
  62
  63         /* treat SG_ERR here to get rid of sg_err.[ch] */
  64         io_hdr.status &= 0x7e;
  65         if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
  66             (0 == io_hdr.driver_status))
  67                 return 0;
  68         if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
  69             (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
  70             (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
  71                 if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
  72                         int sense_key;
  73                         unsigned char * sense_buffer = io_hdr.sbp;
  74                         if (sense_buffer[0] & 0x2)
  75                                 sense_key = sense_buffer[1] & 0xf;
  76                         else
  77                                 sense_key = sense_buffer[2] & 0xf;
  78                         if(RECOVERED_ERROR == sense_key)
  79                                 return 0;
  80                 }
  81         }
  82         return -1;
  83 }
  84
  85 static int
  86 do_tur(int fd)
  87 {
  88         unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
  89         struct sg_io_hdr io_hdr;
  90         unsigned char sense_buffer[32];
  91
  92         memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
  93         io_hdr.interface_id = 'S';
  94         io_hdr.cmd_len = sizeof (turCmdBlk);
  95         io_hdr.mx_sb_len = sizeof (sense_buffer);
  96         io_hdr.dxfer_direction = SG_DXFER_NONE;
  97         io_hdr.cmdp = turCmdBlk;
  98         io_hdr.sbp = sense_buffer;
  99         io_hdr.timeout = 20000;
 100         io_hdr.pack_id = 0;
 101         if (ioctl(fd, SG_IO, &io_hdr) < 0) {
 102                 close(fd);
 103                 return 0;
 104         }
 105         if (io_hdr.info & SG_INFO_OK_MASK) {
 106                 return 0;
 107         }
 108         return 1;
 109 }
 110
 111 static void
 112 sprint_wwid(char * buff, const char * str)
 113 {
 114         int i;
 115         const char *p;
 116         char *cursor;
 117         unsigned char c;
 118
 119         p = str;
 120         cursor = buff;
 121         for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
 122                 c = *p++;
 123                 sprintf(cursor, "%.2x", (int) (unsigned char) c);
 124                 cursor += 2;
 125         }
 126         buff[WWID_SIZE - 1] = '\0';
 127 }
 128
 129 static int
 130 get_lun_strings(int fd, struct path * mypath)
 131 {
 132         char buff[36];
 133
 134         if (0 == do_inq(fd, 0, 0, 0, buff, 36, 1)) {
 135                 memcpy(mypath->vendor_id, &buff[8], 8);
 136                 memcpy(mypath->product_id, &buff[16], 16);
 137                 memcpy(mypath->rev, &buff[32], 4);
 138                 return 1;
 139         }
 140         return 0;
 141 }
 142
 143 /*
 144 static int
 145 get_serial (int fd, char * str)
 146 {
 147         char buff[MX_ALLOC_LEN + 1];
 148         int len;
 149
 150         if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
 151                 len = buff[3];
 152                 if (len > 0) {
 153                         memcpy(str, buff + 4, len);
 154                         buff[len] = '\0';
 155                 }
 156                 return 1;
 157         }
 158         return 0;
 159 }
 160 */
 161
 162 /* hardware vendor specifics : add support for new models below */
 163 static int
 164 get_storageworks_wwid(int fd, char *str)
 165 {
 166         char buff[64];
 167
 168         if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
 169                 sprint_wwid(str, &buff[8]);
 170                 return 1;
 171         }
 172         return 0;
 173 }
 174
 175 /* White list switch */
 176 static int
 177 get_unique_id(int fd, struct path * mypath)
 178 {
 179         if (strncmp(mypath->product_id, "HSV110 (C)COMPAQ", 16) == 0 ||
 180             strncmp(mypath->product_id, "HSG80           ", 16) == 0) {
 181                 get_storageworks_wwid(fd, mypath->wwid);
 182                 return 0;
 183         }
 184
 185         return 1;
 186 }
 187
 188 static void
 189 basename(char * str1, char * str2)
 190 {
 191         char *p = str1 + (strlen(str1) - 1);
 192
 193         while (*--p != '/')
 194                 continue;
 195         strcpy(str2, ++p);
 196 }
 197
 198 static int
 199 blacklist (char * dev) {
 200         int i;
 201         static struct {
 202                 char * headstr;
 203                 int lengh;
 204         } blist[] = {
 205                 {"cciss", 5},
 206                 {"hd", 2},
 207                 {"md", 2},
 208                 {"dm", 2},
 209                 {"sr", 2},
 210                 {"scd", 3},
 211                 {"ram", 3},
 212                 {"raw", 3},
 213                 {NULL, 0},
 214         };
 215
 216         for (i = 0; blist[i].lengh; i++) {
 217                 if (strncmp(dev, blist[i].headstr, blist[i].lengh))
 218                         return 1;
 219         }
 220         return 0;
 221 }
 222
 223 static int
 224 get_all_paths_sysfs(struct env * conf, struct path * all_paths)
 225 {
 226         int k=0;
 227         int sg_fd;
 228         struct sysfs_directory * sdir;
 229         struct sysfs_directory * devp;
 230         struct sysfs_link * linkp;
 231         char buff[FILE_NAME_SIZE];
 232
 233         char block_path[FILE_NAME_SIZE];
 234
 235         sprintf(block_path, "%s/block", conf->sysfs_path);
 236         sdir = sysfs_open_directory(block_path);
 237         sysfs_read_directory(sdir);
 238         dlist_for_each_data(sdir->subdirs, devp, struct sysfs_directory) {
 239                 if (blacklist(devp->name))
 240                         continue;
 241                 sysfs_read_directory(devp);
 242                 if(devp->links == NULL)
 243                         continue;
 244                 dlist_for_each_data(devp->links, linkp, struct sysfs_link) {
 245                         if (!strncmp(linkp->name, "device", 6))
 246                                 break;
 247                 }
 248                 if (linkp == NULL) {
 249                         continue;
 250                 }
 251
 252                 basename(devp->path, buff);
 253                 sprintf(all_paths[k].sg_dev, "/dev/%s", buff);
 254                 strcpy(all_paths[k].dev, all_paths[k].sg_dev);
 255                 if ((sg_fd = open(all_paths[k].sg_dev, O_RDONLY)) < 0) {
 256                         continue;
 257                 }
 258                 get_lun_strings(sg_fd, &all_paths[k]);
 259                 get_unique_id(sg_fd, &all_paths[k]);
 260                 all_paths[k].state = do_tur(sg_fd);
 261                 close(sg_fd);
 262                 basename(linkp->target, buff);
 263                 sscanf(buff, "%i:%i:%i:%i",
 264                         &all_paths[k].sg_id.host_no,
 265                         &all_paths[k].sg_id.channel,
 266                         &all_paths[k].sg_id.scsi_id,
 267                         &all_paths[k].sg_id.lun);
 268                 k++;
 269         }
 270         sysfs_close_directory(sdir);
 271
 272         return 0;
 273 }
 274
 275 static int
 276 get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
 277                       struct scsi_dev * all_scsi_ids)
 278 {
 279         int k, i, sg_fd;
 280         char buff[FILE_NAME_SIZE];
 281         char file_name[FILE_NAME_SIZE];
 282
 283         for (k = 0; k < conf->max_devs; k++) {
 284                 strcpy(file_name, "/dev/sg");
 285                 sprintf(buff, "%d", k);
 286                 strncat(file_name, buff, FILE_NAME_SIZE);
 287                 strcpy(all_paths[k].sg_dev, file_name);
 288                 if ((sg_fd = open(file_name, O_RDONLY)) < 0)
 289                         continue;
 290                 get_lun_strings(sg_fd, &all_paths[k]);
 291                 get_unique_id(sg_fd, &all_paths[k]);
 292                 all_paths[k].state = do_tur(sg_fd);
 293                 if (0 > ioctl(sg_fd, SG_GET_SCSI_ID, &(all_paths[k].sg_id)))
 294                         printf("device %s failed on sg ioctl, skip\n",
 295                                file_name);
 296
 297                 close(sg_fd);
 298
 299                 for (i = 0; i < conf->max_devs; i++) {
 300                         if ((all_paths[k].sg_id.host_no ==
 301                              all_scsi_ids[i].host_no)
 302                             && (all_paths[k].sg_id.scsi_id ==
 303                                 (all_scsi_ids[i].scsi_id.dev_id & 0xff))
 304                             && (all_paths[k].sg_id.lun ==
 305                                 ((all_scsi_ids[i].scsi_id.dev_id >> 8) & 0xff))
 306                             && (all_paths[k].sg_id.channel ==
 307                                 ((all_scsi_ids[i].scsi_id.
 308                                   dev_id >> 16) & 0xff))) {
 309                                 strcpy(all_paths[k].dev, all_scsi_ids[i].dev);
 310                                 break;
 311                         }
 312                 }
 313         }
 314         return 0;
 315 }
 316
 317 static int
 318 get_all_scsi_ids(struct env * conf, struct scsi_dev * all_scsi_ids)
 319 {
 320         int k, big, little, res, host_no, fd;
 321         char buff[64];
 322         char fname[FILE_NAME_SIZE];
 323         struct scsi_idlun my_scsi_id;
 324
 325         for (k = 0; k < conf->max_devs; k++) {
 326                 strcpy(fname, "/dev/sd");
 327                 if (k < 26) {
 328                         buff[0] = 'a' + (char) k;
 329                         buff[1] = '\0';
 330                         strcat(fname, buff);
 331                 } else if (k <= 255) {  /* assumes sequence goes x,y,z,aa,ab,ac etc */
 332                         big = k / 26;
 333                         little = k - (26 * big);
 334                         big = big - 1;
 335
 336                         buff[0] = 'a' + (char) big;
 337                         buff[1] = 'a' + (char) little;
 338                         buff[2] = '\0';
 339                         strcat(fname, buff);
 340                 } else
 341                         strcat(fname, "xxxx");
 342
 343                 if ((fd = open(fname, O_RDONLY)) < 0)
 344                         continue;
 345
 346                 res = ioctl(fd, SCSI_IOCTL_GET_IDLUN, &my_scsi_id);
 347                 if (res < 0) {
 348                         close(fd);
 349                         printf("Could not get scsi idlun\n");
 350                         continue;
 351                 }
 352
 353                 res = ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &host_no);
 354                 if (res < 0) {
 355                         close(fd);
 356                         printf("Could not get host_no\n");
 357                         continue;
 358                 }
 359
 360                 close(fd);
 361
 362                 strcpy(all_scsi_ids[k].dev, fname);
 363                 all_scsi_ids[k].scsi_id = my_scsi_id;
 364                 all_scsi_ids[k].host_no = host_no;
 365         }
 366         return 0;
 367 }
 368
 369 /* print_path style */
 370 #define ALL     0
 371 #define NOWWID  1
 372
 373 static void
 374 print_path(struct path * all_paths, int k, int style)
 375 {
 376         if (style != NOWWID)
 377                 printf("%s ", all_paths[k].wwid);
 378         else
 379                 printf(" \\_");
 380         printf("(%i %i %i %i) ",
 381                all_paths[k].sg_id.host_no,
 382                all_paths[k].sg_id.channel,
 383                all_paths[k].sg_id.scsi_id, all_paths[k].sg_id.lun);
 384         printf("%s ", all_paths[k].sg_dev);
 385         printf("op:%i ", all_paths[k].state);
 386         printf("%s ", all_paths[k].dev);
 387         printf("[%.16s]\n", all_paths[k].product_id);
 388 }
 389
 390 static void
 391 print_all_path(struct env * conf, struct path * all_paths)
 392 {
 393         int k;
 394         char empty_buff[WWID_SIZE];
 395
 396         memset(empty_buff, 0, WWID_SIZE);
 397         for (k = 0; k < conf->max_devs; k++) {
 398                 if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
 399                         continue;
 400                 print_path(all_paths, k, ALL);
 401         }
 402 }
 403
 404 static void
 405 print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
 406 {
 407         int k, i;
 408
 409         for (k = 0; k <= nmp; k++) {
 410                 printf("%s\n", mp[k].wwid);
 411                 for (i = 0; i <= mp[k].npaths; i++)
 412                         print_path(all_paths, PINDEX(k,i), NOWWID);
 413         }
 414 }
 415
 416 static int
 417 coalesce_paths(struct env * conf, struct multipath * mp,
 418                struct path * all_paths)
 419 {
 420         int k, i, nmp, np, already_done;
 421         char empty_buff[WWID_SIZE];
 422
 423         nmp = -1;
 424         already_done = 0;
 425         memset(empty_buff, 0, WWID_SIZE);
 426
 427         for (k = 0; k < conf->max_devs - 1; k++) {
 428                 /* skip this path if no unique id has been found */
 429                 if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
 430                         continue;
 431                 np = 0;
 432
 433                 for (i = 0; i <= nmp; i++) {
 434                         if (0 == strcmp(mp[i].wwid, all_paths[k].wwid))
 435                                 already_done = 1;
 436                 }
 437
 438                 if (already_done) {
 439                         already_done = 0;
 440                         continue;
 441                 }
 442
 443                 nmp++;
 444                 strcpy(mp[nmp].wwid, all_paths[k].wwid);
 445                 PINDEX(nmp,np) = k;
 446
 447                 for (i = k + 1; i < conf->max_devs; i++) {
 448                         if (0 == strcmp(all_paths[k].wwid, all_paths[i].wwid)) {
 449                                 np++;
 450                                 PINDEX(nmp,np) = i;
 451                                 mp[nmp].npaths = np;
 452                         }
 453                 }
 454         }
 455         return nmp;
 456 }
 457
 458 static long
 459 get_disk_size (struct env * conf, char * dev) {
 460         long size;
 461         int fd;
 462         char attr_path[FILE_NAME_SIZE];
 463         char buff[FILE_NAME_SIZE];
 464         char basedev[FILE_NAME_SIZE];
 465
 466         if(conf->with_sysfs) {
 467                 basename(dev, basedev);
 468                 sprintf(attr_path, "%s/block/%s/size",
 469                         conf->sysfs_path, basedev);
 470                 if (0 > sysfs_read_attribute_value(attr_path, buff,
 471                                          FILE_NAME_SIZE * sizeof(char)))
 472                         return -1;
 473                 size = atoi(buff);
 474                 return size;
 475         } else {
 476                 if ((fd = open(dev, O_RDONLY)) < 0)
 477                         return -1;
 478                 if(!ioctl(fd, BLKGETSIZE, &size))
 479                         return size;
 480         }
 481         return -1;
 482 }
 483
 484 static int
 485 make_dm_node(char * str)
 486 {
 487         int r = 0;
 488         char buff[FILE_NAME_SIZE];
 489         struct dm_names * names;
 490         unsigned next = 0;
 491         struct dm_task *dmt;
 492
 493         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 494                 return 0;
 495
 496         if (!dm_task_run(dmt))
 497                 goto out;
 498
 499         if (!(names = dm_task_get_names(dmt)))
 500                 goto out;
 501
 502         if (!names->dev) {
 503                 r = 1;
 504                 goto out;
 505         }
 506
 507         do {
 508                 if (0 == strcmp(names->name, str))
 509                         break;
 510                 next = names->next;
 511                 names = (void *) names + next;
 512         } while (next);
 513
 514         sprintf(buff, "/dev/mapper/%s", str);
 515         unlink(buff);
 516         mknod(buff, 0600 | S_IFBLK, names->dev);
 517
 518         out:
 519         dm_task_destroy(dmt);
 520         return r;
 521
 522 }
 523
 524 /* future use ?
 525 static int
 526 del_map(char * str) {
 527         struct dm_task *dmt;
 528
 529         if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
 530                 return 0;
 531         if (!dm_task_set_name(dmt, str))
 532                 goto delout;
 533         if (!dm_task_run(dmt))
 534                 goto delout;
 535
 536         printf("Deleted device map : %s\n", str);
 537
 538         delout:
 539         dm_task_destroy(dmt);
 540         return 1;
 541 }
 542 */
 543
 544 static int
 545 add_map(struct env * conf, struct path * all_paths,
 546         struct multipath * mp, int index, int op)
 547 {
 548         char params[255];
 549         char * params_p;
 550         struct dm_task *dmt;
 551         int i, np;
 552         long size = -1;
 553
 554         if (!(dmt = dm_task_create(op)))
 555                 return 0;
 556
 557         if (!dm_task_set_name(dmt, mp[index].wwid))
 558                 goto addout;
 559         params_p = &params[0];
 560
 561         np = 0;
 562         for (i=0; i<=mp[index].npaths; i++) {
 563                 if ((1 == all_paths[PINDEX(index,i)].state) &&
 564                         (0 == all_paths[PINDEX(index,i)].sg_id.scsi_type))
 565                         np++;
 566         }
 567         if (np == 0)
 568                 goto addout;
 569         params_p += sprintf(params_p, "%i 32", np);
 570
 571         for (i=0; i<=mp[index].npaths; i++) {
 572                 if (( 0 == all_paths[PINDEX(index,i)].state) ||
 573                         (0 != all_paths[PINDEX(index,i)].sg_id.scsi_type))
 574                         continue;
 575                 if (size < 0)
 576                         size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
 577                 params_p += sprintf(params_p, " %s %i",
 578                         all_paths[PINDEX(index,i)].dev, 0);
 579         }
 580
 581         if (size < 0)
 582                 goto addout;
 583
 584         if (!conf->quiet) {
 585                 if (op == DM_DEVICE_RELOAD)
 586                         printf("U|");
 587                 if (op == DM_DEVICE_CREATE)
 588                         printf("N|");
 589                 printf("%s : 0 %li %s %s\n",
 590                         mp[index].wwid, size, DM_TARGET, params);
 591         }
 592
 593         if (!dm_task_add_target(dmt, 0, size, DM_TARGET, params))
 594                 goto addout;
 595
 596         if (!dm_task_run(dmt))
 597                 goto addout;
 598
 599
 600         make_dm_node(mp[index].wwid);
 601
 602         addout:
 603         dm_task_destroy(dmt);
 604         return 1;
 605 }
 606
 607 /*
 608 static int
 609 get_table(const char * str)
 610 {
 611         int r = 0;
 612         struct dm_task *dmt;
 613         void *next = NULL;
 614         uint64_t start, length;
 615         char *target_type = NULL;
 616         char *params;
 617
 618         if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
 619                 return 0;
 620
 621         if (!dm_task_set_name(dmt, str))
 622                 goto out;
 623
 624         if (!dm_task_run(dmt))
 625                 goto out;
 626
 627         do {
 628                 next = dm_get_next_target(dmt, next, &start, &length,
 629                                           &target_type, &params);
 630                 if (target_type) {
 631                         printf("%" PRIu64 " %" PRIu64 " %s %s\n",
 632                                start, length, target_type, params);
 633                 }
 634         } while (next);
 635
 636         r = 1;
 637
 638       out:
 639         dm_task_destroy(dmt);
 640         return r;
 641
 642 }
 643 */
 644
 645 static int
 646 map_present(char * str)
 647 {
 648         int r = 0;
 649         struct dm_task *dmt;
 650         struct dm_names *names;
 651         unsigned next = 0;
 652
 653         if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
 654                 return 0;
 655
 656         if (!dm_task_run(dmt))
 657                 goto out;
 658
 659         if (!(names = dm_task_get_names(dmt)))
 660                 goto out;
 661
 662         if (!names->dev) {
 663                 goto out;
 664         }
 665
 666         do {
 667                 if (0 == strcmp(names->name, str))
 668                         r = 1;
 669                 next = names->next;
 670                 names = (void *) names + next;
 671         } while (next);
 672
 673         out:
 674         dm_task_destroy(dmt);
 675         return r;
 676 }
 677
 678 static void
 679 usage(char * progname)
 680 {
 681         fprintf(stderr, VERSION_STRING);
 682         fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]\n", progname);
 683         fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
 684         fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
 685         fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\n");
 686         fprintf(stderr, "\t-m max_devs\tscan {max_devs} devices at most\n");
 687         exit(1);
 688 }
 689
 690 static int
 691 filepresent(char * run) {
 692         struct stat buf;
 693
 694         if(!stat(run, &buf))
 695                 return 1;
 696         return 0;
 697 }
 698
 699 int
 700 main(int argc, char *argv[])
 701 {
 702         char * run = "/var/run/multipath.run";
 703         char * resched = "/var/run/multipath.reschedule";
 704         struct multipath * mp;
 705         struct path * all_paths;
 706         struct scsi_dev * all_scsi_ids;
 707         struct env conf;
 708         int i, k, nmp;
 709
 710         /* Default behaviour */
 711         conf.max_devs = MAX_DEVS;
 712         conf.dry_run = 0;       /* 1 == Do not Create/Update devmaps */
 713         conf.verbose = 0;       /* 1 == Print all_paths and mp */
 714         conf.quiet = 0;         /* 1 == Do not even print devmaps */
 715         conf.with_sysfs = 0;    /* Default to compat / suboptimal behaviour */
 716
 717         /* kindly provided by libsysfs */
 718         if (0 == sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE))
 719                 conf.with_sysfs = 1;
 720
 721         for (i = 1; i < argc; ++i) {
 722                 if (0 == strcmp("-v", argv[i])) {
 723                         if (conf.quiet == 1)
 724                                 usage(argv[0]);
 725                         conf.verbose = 1;
 726                 } else if (0 == strcmp("-m", argv[i])) {
 727                         conf.max_devs = atoi(argv[++i]);
 728                         if (conf.max_devs < 2)
 729                                 usage(argv[0]);
 730                 } else if (0 == strcmp("-q", argv[i])) {
 731                         if (conf.verbose == 1)
 732                                 usage(argv[0]);
 733                         conf.quiet = 1;
 734                 } else if (0 == strcmp("-d", argv[i]))
 735                         conf.dry_run = 1;
 736                 else if (*argv[i] == '-') {
 737                         fprintf(stderr, "Unknown switch: %s\n", argv[i]);
 738                         usage(argv[0]);
 739                 } else if (*argv[i] != '-') {
 740                         fprintf(stderr, "Unknown argument\n");
 741                         usage(argv[0]);
 742                 }
 743
 744         }
 745
 746         if (filepresent(run)) {
 747                 if (conf.verbose) {
 748                         fprintf(stderr, "Already running.\n");
 749                         fprintf(stderr, "If you know what you do, please ");
 750                         fprintf(stderr, "remove %s\n", run);
 751                 }
 752                 /* leave a trace that we were called while already running */
 753                 open(resched, O_CREAT);
 754                 return 1;
 755         }
 756
 757         /* dynamic allocations */
 758         mp = malloc(conf.max_devs * sizeof(struct multipath));
 759         all_paths = malloc(conf.max_devs * sizeof(struct path));
 760         all_scsi_ids = malloc(conf.max_devs * sizeof(struct scsi_dev));
 761         if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL) {
 762                 unlink(run);
 763                 exit(1);
 764         }
 765 start:
 766         if(!open(run, O_CREAT))
 767                 exit(1);
 768
 769         if (!conf.with_sysfs) {
 770                 get_all_scsi_ids(&conf, all_scsi_ids);
 771                 get_all_paths_nosysfs(&conf, all_paths, all_scsi_ids);
 772         } else {
 773                 get_all_paths_sysfs(&conf, all_paths);
 774         }
 775         nmp = coalesce_paths(&conf, mp, all_paths);
 776
 777         if (conf.verbose) {
 778                 print_all_path(&conf, all_paths);
 779                 fprintf(stdout, "\n");
 780                 print_all_mp(all_paths, mp, nmp);
 781                 fprintf(stdout, "\n");
 782         }
 783
 784         if (conf.dry_run) {
 785                 unlink(run);
 786                 exit(0);
 787         }
 788
 789         for (k=0; k<=nmp; k++) {
 790                 if (map_present(mp[k].wwid)) {
 791                         add_map(&conf, all_paths, mp, k, DM_DEVICE_RELOAD);
 792                 } else {
 793                         add_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);
 794                 }
 795         }
 796         unlink(run);
 797
 798         /* start again if we were ask to during this process run */
 799         /* ie. do not loose an event-asked run */
 800         if (filepresent(resched)) {
 801                 unlink(resched);
 802                 goto start;
 803         }
 804         exit(0);
 805 }