multipath/main.c

   1 /*
   2  * Soft:        multipath device mapper target autoconfig
   3  *
   4  * Version:     $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
   5  *
   6  * Author:      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  * Copyright (c) 2003, 2004, 2005 Christophe Varoqui
  19  * Copyright (c) 2005 Benjamin Marzinski, Redhat
  20  * Copyright (c) 2005 Kiyoshi Ueda, NEC
  21  * Copyright (c) 2005 Patrick Caulfield, Redhat
  22  * Copyright (c) 2005 Edward Goggin, EMC
  23  */
  24
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <ctype.h>
  28 #include <sysfs/libsysfs.h>
  29
  30 #include <vector.h>
  31 #include <memory.h>
  32 #include <libdevmapper.h>
  33 #include <devmapper.h>
  34 #include <path_state.h>
  35 #include <blacklist.h>
  36 #include <util.h>
  37 #include <defaults.h>
  38 #include <structs.h>
  39 #include <structs_vec.h>
  40 #include <dmparser.h>
  41 #include <cache.h>
  42 #include <config.h>
  43 #include <discovery.h>
  44 #include <debug.h>
  45 #include <switchgroup.h>
  46 #include <print.h>
  47 #include <alias.h>
  48 #include <configure.h>
  49 #include <pgpolicies.h>
  50
  51 #include "main.h"
  52
  53 static int
  54 filter_pathvec (vector pathvec, char * refwwid)
  55 {
  56         int i;
  57         struct path * pp;
  58
  59         if (!refwwid || !strlen(refwwid))
  60                 return 0;
  61
  62         vector_foreach_slot (pathvec, pp, i) {
  63                 if (strncmp(pp->wwid, refwwid, WWID_SIZE) != 0) {
  64                         condlog(3, "skip path %s : out of scope", pp->dev);
  65                         free_path(pp);
  66                         vector_del_slot(pathvec, i);
  67                         i--;
  68                 }
  69         }
  70         return 0;
  71 }
  72
  73 static void
  74 usage (char * progname)
  75 {
  76         fprintf (stderr, VERSION_STRING);
  77         fprintf (stderr, "Usage: %s\t[-v level] [-d] [-l|-ll|-f|-F]\n",
  78                 progname);
  79         fprintf (stderr,
  80                 "\t\t\t[-p failover|multibus|group_by_serial|group_by_prio]\n" \
  81                 "\t\t\t[device]\n" \
  82                 "\n" \
  83                 "\t-v level\tverbosity level\n" \
  84                 "\t   0\t\t\tno output\n" \
  85                 "\t   1\t\t\tprint created devmap names only\n" \
  86                 "\t   2\t\t\tdefault verbosity\n" \
  87                 "\t   3\t\t\tprint debug information\n" \
  88                 "\t-b file\t\tbindings file location\n" \
  89                 "\t-d\t\tdry run, do not create or update devmaps\n" \
  90                 "\t-l\t\tshow multipath topology (sysfs and DM info)\n" \
  91                 "\t-ll\t\tshow multipath topology (maximum info)\n" \
  92                 "\t-f\t\tflush a multipath device map\n" \
  93                 "\t-F\t\tflush all multipath device maps\n" \
  94                 "\t-p policy\tforce all maps to specified policy :\n" \
  95                 "\t   failover\t\t1 path per priority group\n" \
  96                 "\t   multibus\t\tall paths in 1 priority group\n" \
  97                 "\t   group_by_serial\t1 priority group per serial\n" \
  98                 "\t   group_by_prio\t1 priority group per priority lvl\n" \
  99                 "\t   group_by_node_name\t1 priority group per target node\n" \
 100                 "\n" \
 101                 "\tdevice\t\tlimit scope to the device's multipath\n" \
 102                 "\t\t\t(udev-style $DEVNAME reference, eg /dev/sdb\n" \
 103                 "\t\t\tor major:minor or a device map name)\n" \
 104                 );
 105
 106         exit(1);
 107 }
 108
 109 static int
 110 update_paths (struct multipath * mpp)
 111 {
 112         int i, j;
 113         struct pathgroup * pgp;
 114         struct path * pp;
 115
 116         if (!mpp->pg)
 117                 return 0;
 118
 119         vector_foreach_slot (mpp->pg, pgp, i) {
 120                 if (!pgp->paths)
 121                         continue;
 122
 123                 vector_foreach_slot (pgp->paths, pp, j) {
 124                         if (!strlen(pp->dev)) {
 125                                 if (devt2devname(pp->dev, pp->dev_t)) {
 126                                         /*
 127                                          * path is not in sysfs anymore
 128                                          */
 129                                         pp->state = PATH_DOWN;
 130                                         continue;
 131                                 }
 132                                 pathinfo(pp, conf->hwtable, DI_ALL);
 133                                 continue;
 134                         }
 135                         if (pp->state == PATH_UNCHECKED)
 136                                 pathinfo(pp, conf->hwtable, DI_CHECKER);
 137
 138                         if (!pp->priority)
 139                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 140                 }
 141         }
 142         return 0;
 143 }
 144
 145 static int
 146 get_dm_mpvec (vector curmp, vector pathvec, char * refwwid)
 147 {
 148         int i;
 149         struct multipath * mpp;
 150
 151         if (dm_get_maps(curmp, DEFAULT_TARGET))
 152                 return 1;
 153
 154         vector_foreach_slot (curmp, mpp, i) {
 155                 /*
 156                  * discard out of scope maps
 157                  */
 158                 if (mpp->wwid && refwwid &&
 159                     strncmp(mpp->wwid, refwwid, WWID_SIZE)) {
 160                         condlog(3, "skip map %s: out of scope", mpp->alias);
 161                         free_multipath(mpp, KEEP_PATHS);
 162                         vector_del_slot(curmp, i);
 163                         i--;
 164                         continue;
 165                 }
 166
 167                 condlog(3, "params = %s", mpp->params);
 168                 condlog(3, "status = %s", mpp->status);
 169
 170                 disassemble_map(pathvec, mpp->params, mpp);
 171
 172                 /*
 173                  * disassemble_map() can add new paths to pathvec.
 174                  * If not in "fast list mode", we need to fetch information
 175                  * about them
 176                  */
 177                 if (conf->list != 1)
 178                         update_paths(mpp);
 179
 180                 if (conf->list > 1)
 181                         mpp->bestpg = select_path_group(mpp);
 182
 183                 disassemble_status(mpp->status, mpp);
 184
 185                 if (conf->list)
 186                         print_mp(mpp, conf->verbosity);
 187
 188                 if (!conf->dry_run)
 189                         reinstate_paths(mpp);
 190         }
 191         return 0;
 192 }
 193
 194
 195 /*
 196  * Return value:
 197  *  -1: Retry
 198  *   0: Success
 199  *   1: Failure
 200  */
 201 static int
 202 configure (void)
 203 {
 204         vector curmp = NULL;
 205         vector pathvec = NULL;
 206         struct vectors vecs;
 207         int r = 1;
 208         int di_flag = 0;
 209         char * refwwid = NULL;
 210         char * dev = NULL;
 211
 212         /*
 213          * allocate core vectors to store paths and multipaths
 214          */
 215         curmp = vector_alloc();
 216         pathvec = vector_alloc();
 217
 218         if (!curmp || !pathvec) {
 219                 condlog(0, "can not allocate memory");
 220                 goto out;
 221         }
 222         vecs.pathvec = pathvec;
 223         vecs.mpvec = curmp;
 224
 225         /*
 226          * if we have a blacklisted device parameter, exit early
 227          */
 228         if (conf->dev) {
 229                 if (!strncmp(conf->dev, "/dev/", 5) &&
 230                     strlen(conf->dev) > 5)
 231                         dev = conf->dev + 5;
 232                 else
 233                         dev = conf->dev;
 234         }
 235
 236         if (dev && blacklist(conf->blist, dev))
 237                 goto out;
 238
 239         condlog(3, "load path identifiers cache");
 240         cache_load(pathvec);
 241
 242         if (conf->verbosity > 2)
 243                 print_all_paths(pathvec, 1);
 244
 245         /*
 246          * scope limiting must be translated into a wwid
 247          * failing the translation is fatal (by policy)
 248          */
 249         if (conf->dev) {
 250                 refwwid = get_refwwid(conf->dev, conf->dev_type, pathvec);
 251
 252                 if (!refwwid) {
 253                         condlog(3, "scope is nul");
 254                         goto out;
 255                 }
 256                 condlog(3, "scope limited to %s", refwwid);
 257         }
 258
 259         /*
 260          * get a path list
 261          */
 262         if (conf->dev)
 263                 di_flag = DI_WWID;
 264
 265         if (conf->list > 1)
 266                 /* extended path info '-ll' */
 267                 di_flag |= DI_SYSFS | DI_CHECKER;
 268         else if (conf->list)
 269                 /* minimum path info '-l' */
 270                 di_flag |= DI_SYSFS;
 271         else
 272                 /* maximum info */
 273                 di_flag = DI_ALL;
 274
 275         if (path_discovery(pathvec, conf, di_flag))
 276                 goto out;
 277
 278         if (conf->verbosity > 2)
 279                 print_all_paths(pathvec, 1);
 280
 281         get_path_layout(pathvec);
 282
 283         if (get_dm_mpvec(curmp, pathvec, refwwid))
 284                 goto out;
 285
 286         filter_pathvec(pathvec, refwwid);
 287
 288         if (conf->list)
 289                 goto out;
 290
 291         /*
 292          * core logic entry point
 293          */
 294         r = coalesce_paths(&vecs, NULL);
 295
 296 out:
 297         if (refwwid)
 298                 FREE(refwwid);
 299
 300         free_multipathvec(curmp, KEEP_PATHS);
 301         free_pathvec(pathvec, FREE_PATHS);
 302
 303         return r;
 304 }
 305
 306 int
 307 main (int argc, char *argv[])
 308 {
 309         int arg;
 310         extern char *optarg;
 311         extern int optind;
 312         int i, r;
 313
 314         if (getuid() != 0) {
 315                 fprintf(stderr, "need to be root\n");
 316                 exit(1);
 317         }
 318
 319         if (dm_prereq(DEFAULT_TARGET, 1, 0, 3))
 320                 exit(1);
 321
 322         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
 323                 condlog(0, "multipath tools need sysfs mounted");
 324                 exit(1);
 325         }
 326         if (load_config(DEFAULT_CONFIGFILE))
 327                 exit(1);
 328
 329         while ((arg = getopt(argc, argv, ":qdl::Ffi:M:v:p:b:")) != EOF ) {
 330                 switch(arg) {
 331                 case 1: printf("optarg : %s\n",optarg);
 332                         break;
 333                 case 'v':
 334                         if (sizeof(optarg) > sizeof(char *) ||
 335                             !isdigit(optarg[0]))
 336                                 usage (argv[0]);
 337
 338                         conf->verbosity = atoi(optarg);
 339                         break;
 340                 case 'b':
 341                         conf->bindings_file = optarg;
 342                         break;
 343                 case 'd':
 344                         conf->dry_run = 1;
 345                         break;
 346                 case 'f':
 347                         conf->remove = FLUSH_ONE;
 348                         break;
 349                 case 'F':
 350                         conf->remove = FLUSH_ALL;
 351                         break;
 352                 case 'l':
 353                         conf->list = 1;
 354                         conf->dry_run = 1;
 355
 356                         if (optarg && !strncmp(optarg, "l", 1))
 357                                 conf->list++;
 358
 359                         break;
 360                 case 'M':
 361 #if _DEBUG_
 362                         debug = atoi(optarg);
 363 #endif
 364                         break;
 365                 case 'p':
 366                         conf->pgpolicy_flag = get_pgpolicy_id(optarg);
 367                         if (conf->pgpolicy_flag == -1) {
 368                                 printf("'%s' is not a valid policy\n", optarg);
 369                                 usage(argv[0]);
 370                         }
 371                         break;
 372                 case ':':
 373                         fprintf(stderr, "Missing option arguement\n");
 374                         usage(argv[0]);
 375                 case '?':
 376                         fprintf(stderr, "Unknown switch: %s\n", optarg);
 377                         usage(argv[0]);
 378                 default:
 379                         usage(argv[0]);
 380                 }
 381         }
 382         if (optind < argc) {
 383                 conf->dev = MALLOC(FILE_NAME_SIZE);
 384
 385                 if (!conf->dev)
 386                         goto out;
 387
 388                 strncpy(conf->dev, argv[optind], FILE_NAME_SIZE);
 389
 390                 if (filepresent(conf->dev))
 391                         conf->dev_type = DEV_DEVNODE;
 392                 else if (sscanf(conf->dev, "%d:%d", &i, &i) == 2)
 393                         conf->dev_type = DEV_DEVT;
 394                 else
 395                         conf->dev_type = DEV_DEVMAP;
 396
 397         }
 398
 399         if (conf->remove == FLUSH_ONE) {
 400                 if (conf->dev_type == DEV_DEVMAP)
 401                         dm_flush_map(conf->dev, DEFAULT_TARGET);
 402                 else
 403                         condlog(0, "must provide a map name to remove");
 404
 405                 goto out;
 406         }
 407         else if (conf->remove == FLUSH_ALL) {
 408                 dm_flush_maps(DEFAULT_TARGET);
 409                 goto out;
 410         }
 411         while ((r = configure()) < 0)
 412                 condlog(3, "restart multipath configuration process");
 413
 414 out:
 415         free_config(conf);
 416         dm_lib_release();
 417         dm_lib_exit();
 418 #ifdef _DEBUG_
 419         dbg_free_final(NULL);
 420 #endif
 421         return r;
 422 }