libmultipath/discovery.c

   1 /*
   2  * Copyright (c) 2004, 2005, 2006 Christophe Varoqui
   3  * Copyright (c) 2005 Stefan Bader, IBM
   4  * Copyright (c) 2005 Mike Anderson
   5  */
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/stat.h>
  11 #include <dirent.h>
  12 #include <errno.h>
  13 #include <libgen.h>
  14 #include <libudev.h>
  15
  16 #include "checkers.h"
  17 #include "vector.h"
  18 #include "memory.h"
  19 #include "util.h"
  20 #include "structs.h"
  21 #include "config.h"
  22 #include "blacklist.h"
  23 #include "debug.h"
  24 #include "propsel.h"
  25 #include "sg_include.h"
  26 #include "sysfs.h"
  27 #include "discovery.h"
  28 #include "prio.h"
  29 #include "defaults.h"
  30
  31 int
  32 store_pathinfo (vector pathvec, vector hwtable, struct udev_device *udevice,
  33                 int flag, struct path **pp_ptr)
  34 {
  35         int err = 1;
  36         struct path * pp;
  37         const char * devname;
  38
  39         if (pp_ptr)
  40                 *pp_ptr = NULL;
  41
  42         devname = udev_device_get_sysname(udevice);
  43         if (!devname)
  44                 return 1;
  45
  46         pp = alloc_path();
  47
  48         if (!pp)
  49                 return 1;
  50
  51         if(safe_sprintf(pp->dev, "%s", devname)) {
  52                 condlog(0, "pp->dev too small");
  53                 goto out;
  54         }
  55         pp->udev = udev_device_ref(udevice);
  56         err = pathinfo(pp, hwtable, flag | DI_BLACKLIST);
  57         if (err)
  58                 goto out;
  59
  60         err = store_path(pathvec, pp);
  61         if (err)
  62                 goto out;
  63
  64 out:
  65         if (err)
  66                 free_path(pp);
  67         else if (pp_ptr)
  68                 *pp_ptr = pp;
  69         return err;
  70 }
  71
  72 static int
  73 path_discover (vector pathvec, struct config * conf,
  74                struct udev_device *udevice, int flag)
  75 {
  76         struct path * pp;
  77         const char * devname;
  78
  79         devname = udev_device_get_sysname(udevice);
  80         if (!devname)
  81                 return 0;
  82
  83         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
  84                            (char *)devname) > 0)
  85                 return 0;
  86
  87         pp = find_path_by_dev(pathvec, (char *)devname);
  88         if (!pp) {
  89                 if (store_pathinfo(pathvec, conf->hwtable,
  90                                    udevice, flag, NULL) != 1)
  91                         return 0;
  92                 else
  93                         return 1;
  94         }
  95         return pathinfo(pp, conf->hwtable, flag);
  96 }
  97
  98 int
  99 path_discovery (vector pathvec, struct config * conf, int flag)
 100 {
 101         struct udev_enumerate *udev_iter;
 102         struct udev_list_entry *entry;
 103         struct udev_device *udevice;
 104         const char *devpath;
 105         int r = 0;
 106
 107         udev_iter = udev_enumerate_new(conf->udev);
 108         if (!udev_iter)
 109                 return 1;
 110
 111         udev_enumerate_add_match_subsystem(udev_iter, "block");
 112         udev_enumerate_scan_devices(udev_iter);
 113
 114         udev_list_entry_foreach(entry,
 115                                 udev_enumerate_get_list_entry(udev_iter)) {
 116                 const char *devtype;
 117                 devpath = udev_list_entry_get_name(entry);
 118                 condlog(4, "Discover device %s", devpath);
 119                 udevice = udev_device_new_from_syspath(conf->udev, devpath);
 120                 if (!udevice) {
 121                         condlog(4, "%s: no udev information", devpath);
 122                         r++;
 123                         continue;
 124                 }
 125                 devtype = udev_device_get_devtype(udevice);
 126                 if(devtype && !strncmp(devtype, "disk", 4))
 127                         r += path_discover(pathvec, conf, udevice, flag);
 128                 udev_device_unref(udevice);
 129         }
 130         udev_enumerate_unref(udev_iter);
 131         condlog(4, "Discovery status %d", r);
 132         return r;
 133 }
 134
 135 #define declare_sysfs_get_str(fname)                                    \
 136 extern int                                                              \
 137 sysfs_get_##fname (struct udev_device * udev, char * buff, size_t len)  \
 138 {                                                                       \
 139         const char * attr;                                              \
 140         const char * devname;                                           \
 141                                                                         \
 142         devname = udev_device_get_sysname(udev);                        \
 143                                                                         \
 144         attr = udev_device_get_sysattr_value(udev, #fname);             \
 145         if (!attr) {                                                    \
 146                 condlog(3, "%s: attribute %s not found in sysfs",       \
 147                         devname, #fname);                               \
 148                 return 1;                                               \
 149         }                                                               \
 150         if (strlen(attr) > len) {                                       \
 151                 condlog(3, "%s: overflow in attribute %s",              \
 152                         devname, #fname);                               \
 153                 return 2;                                               \
 154         }                                                               \
 155         strlcpy(buff, attr, len);                                       \
 156         return 0;                                                       \
 157 }
 158
 159 declare_sysfs_get_str(devtype);
 160 declare_sysfs_get_str(cutype);
 161 declare_sysfs_get_str(vendor);
 162 declare_sysfs_get_str(model);
 163 declare_sysfs_get_str(rev);
 164 declare_sysfs_get_str(state);
 165 declare_sysfs_get_str(dev);
 166
 167 int
 168 sysfs_get_timeout(struct path *pp, unsigned int *timeout)
 169 {
 170         const char *attr = NULL;
 171         const char *subsys;
 172         struct udev_device *parent;
 173         int r;
 174         unsigned int t;
 175
 176         if (!pp->udev || pp->bus != SYSFS_BUS_SCSI)
 177                 return 1;
 178
 179         parent = pp->udev;
 180         while (parent) {
 181                 subsys = udev_device_get_subsystem(parent);
 182                 attr = udev_device_get_sysattr_value(parent, "timeout");
 183                 if (subsys && attr)
 184                         break;
 185                 parent = udev_device_get_parent(parent);
 186         }
 187         if (!attr) {
 188                 condlog(3, "%s: No timeout value in sysfs", pp->dev);
 189                 return 1;
 190         }
 191
 192         r = sscanf(attr, "%u\n", &t);
 193
 194         if (r != 1) {
 195                 condlog(3, "%s: Cannot parse timeout attribute '%s'",
 196                         pp->dev, attr);
 197                 return 1;
 198         }
 199
 200         *timeout = t * 1000;
 201
 202         return 0;
 203 }
 204
 205 int
 206 sysfs_get_tgt_nodename (struct path *pp, char * node)
 207 {
 208         const char *targetid, *value;
 209         struct udev_device *parent, *tgtdev;
 210         int host, channel, rport_id = -1;
 211
 212         parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "scsi", "scsi_device");
 213         if (!parent)
 214                 return 1;
 215         /* Check for SAS */
 216         value = udev_device_get_sysattr_value(parent, "sas_address");
 217         if (value) {
 218                 pp->sg_id.proto_id = SCSI_PROTOCOL_SAS;
 219                 strncpy(node, value, NODE_NAME_SIZE);
 220                 return 0;
 221         }
 222
 223         parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "scsi", "scsi_target");
 224         if (!parent)
 225                 return 1;
 226         /* Check for FibreChannel */
 227         tgtdev = udev_device_get_parent(parent);
 228         value = udev_device_get_sysname(tgtdev);
 229         if (sscanf(value, "rport-%d:%d-%d",
 230                    &host, &channel, &rport_id) == 3) {
 231                 tgtdev = udev_device_new_from_subsystem_sysname(conf->udev,
 232                                 "fc_remote_ports", value);
 233                 if (tgtdev) {
 234                         condlog(3, "SCSI target %d:%d:%d -> "
 235                                 "FC rport %d:%d-%d",
 236                                 pp->sg_id.host_no, pp->sg_id.channel,
 237                                 pp->sg_id.scsi_id, host, channel,
 238                                 rport_id);
 239                         value = udev_device_get_sysattr_value(tgtdev,
 240                                                               "node_name");
 241                         if (value) {
 242                                 pp->sg_id.proto_id = SCSI_PROTOCOL_FCP;
 243                                 pp->sg_id.transport_id = rport_id;
 244                                 strncpy(node, value, NODE_NAME_SIZE);
 245                                 udev_device_unref(tgtdev);
 246                                 return 0;
 247                         } else
 248                                 udev_device_unref(tgtdev);
 249                 }
 250         }
 251
 252         /* Check for iSCSI */
 253         parent = pp->udev;
 254         targetid = NULL;
 255         while (parent) {
 256                 targetid = udev_device_get_sysname(parent);
 257                 if (!strncmp(targetid , "session", 6))
 258                         break;
 259                 parent = udev_device_get_parent(parent);
 260                 targetid = NULL;
 261         }
 262         if (parent) {
 263                 tgtdev = udev_device_new_from_subsystem_sysname(conf->udev, "iscsi_session", targetid);
 264                 if (tgtdev) {
 265                         const char *value;
 266
 267                         value = udev_device_get_sysattr_value(tgtdev, "targetname");
 268                         if (value) {
 269                                 pp->sg_id.proto_id = SCSI_PROTOCOL_ISCSI;
 270                                 strncpy(node, value, NODE_NAME_SIZE);
 271                                 udev_device_unref(tgtdev);
 272                                 return 0;
 273                         }
 274                         else
 275                                 udev_device_unref(tgtdev);
 276                 }
 277         }
 278         return 1;
 279 }
 280
 281 static void
 282 sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp)
 283 {
 284         struct udev_device *rport_dev = NULL;
 285         char value[11];
 286         char rport_id[32];
 287
 288         if (pp->sg_id.proto_id != SCSI_PROTOCOL_FCP) {
 289                 condlog(3, "%s: Not a FCP device", pp->dev);
 290                 return;
 291         }
 292         sprintf(rport_id, "rport-%d:%d-%d",
 293                 pp->sg_id.host_no, pp->sg_id.channel, pp->sg_id.transport_id);
 294         rport_dev = udev_device_new_from_subsystem_sysname(conf->udev,
 295                                 "fc_remote_ports", rport_id);
 296         if (!rport_dev) {
 297                 condlog(1, "%s: No fc_remote_port device for '%s'", pp->dev,
 298                         rport_id);
 299                 return;
 300         }
 301         condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no,
 302                 pp->sg_id.channel, pp->sg_id.scsi_id, rport_id);
 303
 304         snprintf(value, 11, "%u", mpp->dev_loss);
 305         if (mpp->dev_loss &&
 306             sysfs_attr_set_value(rport_dev, "dev_loss_tmo", value, 11) <= 0) {
 307                 if ((mpp->fast_io_fail == MP_FAST_IO_FAIL_UNSET ||
 308                      mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF)
 309                     && mpp->dev_loss > 600) {
 310                         condlog(3, "%s: limiting dev_loss_tmo to 600, since "
 311                                 "fast_io_fail is not set", mpp->alias);
 312                         snprintf(value, 11, "%u", 600);
 313                         if (sysfs_attr_set_value(rport_dev, "dev_loss_tmo",
 314                                                  value, 11) <= 0)
 315                                 condlog(0, "%s failed to set dev_loss_tmo",
 316                                         mpp->alias);
 317                         goto out;
 318                 }
 319         }
 320         if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET){
 321                 if (mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF)
 322                         sprintf(value, "off");
 323                 else if (mpp->fast_io_fail == MP_FAST_IO_FAIL_ZERO)
 324                         sprintf(value, "0");
 325                 else
 326                         snprintf(value, 11, "%u", mpp->fast_io_fail);
 327                 if (sysfs_attr_set_value(rport_dev, "fast_io_fail_tmo",
 328                                          value, 11) <= 0) {
 329                         condlog(0, "%s failed to set fast_io_fail_tmo",
 330                                 mpp->alias);
 331                 }
 332         }
 333 out:
 334         udev_device_unref(rport_dev);
 335 }
 336
 337 int
 338 sysfs_set_scsi_tmo (struct multipath *mpp)
 339 {
 340         struct path *pp;
 341         int i;
 342         int dev_loss_tmo = mpp->dev_loss;
 343
 344         if (mpp->no_path_retry > 0) {
 345                 int no_path_retry_tmo = mpp->no_path_retry * conf->checkint;
 346
 347                 if (no_path_retry_tmo > MAX_DEV_LOSS_TMO)
 348                         no_path_retry_tmo = MAX_DEV_LOSS_TMO;
 349                 if (no_path_retry_tmo > dev_loss_tmo)
 350                         dev_loss_tmo = no_path_retry_tmo;
 351                 condlog(3, "%s: update dev_loss_tmo to %d",
 352                         mpp->alias, dev_loss_tmo);
 353         } else if (mpp->no_path_retry == NO_PATH_RETRY_QUEUE) {
 354                 dev_loss_tmo = MAX_DEV_LOSS_TMO;
 355                 condlog(3, "%s: update dev_loss_tmo to %d",
 356                         mpp->alias, dev_loss_tmo);
 357         }
 358         mpp->dev_loss = dev_loss_tmo;
 359         if (mpp->dev_loss && mpp->fast_io_fail >= (int)mpp->dev_loss) {
 360                 condlog(3, "%s: turning off fast_io_fail (%d is not smaller than dev_loss_tmo)",
 361                         mpp->alias, mpp->fast_io_fail);
 362                 mpp->fast_io_fail = MP_FAST_IO_FAIL_OFF;
 363         }
 364         if (!mpp->dev_loss && mpp->fast_io_fail == MP_FAST_IO_FAIL_UNSET)
 365                 return 0;
 366
 367         vector_foreach_slot(mpp->paths, pp, i) {
 368                 sysfs_set_rport_tmo(mpp, pp);
 369         }
 370         return 0;
 371 }
 372
 373 int
 374 do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
 375        void *resp, int mx_resp_len)
 376 {
 377         unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
 378                 { INQUIRY_CMD, 0, 0, 0, 0, 0 };
 379         unsigned char sense_b[SENSE_BUFF_LEN];
 380         struct sg_io_hdr io_hdr;
 381
 382         if (cmddt)
 383                 inqCmdBlk[1] |= 2;
 384         if (evpd)
 385                 inqCmdBlk[1] |= 1;
 386         inqCmdBlk[2] = (unsigned char) pg_op;
 387         inqCmdBlk[3] = (unsigned char)((mx_resp_len >> 8) & 0xff);
 388         inqCmdBlk[4] = (unsigned char) (mx_resp_len & 0xff);
 389         memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
 390         memset(sense_b, 0, SENSE_BUFF_LEN);
 391         io_hdr.interface_id = 'S';
 392         io_hdr.cmd_len = sizeof (inqCmdBlk);
 393         io_hdr.mx_sb_len = sizeof (sense_b);
 394         io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 395         io_hdr.dxfer_len = mx_resp_len;
 396         io_hdr.dxferp = resp;
 397         io_hdr.cmdp = inqCmdBlk;
 398         io_hdr.sbp = sense_b;
 399         io_hdr.timeout = DEF_TIMEOUT;
 400
 401         if (ioctl(sg_fd, SG_IO, &io_hdr) < 0)
 402                 return -1;
 403
 404         /* treat SG_ERR here to get rid of sg_err.[ch] */
 405         io_hdr.status &= 0x7e;
 406         if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
 407             (0 == io_hdr.driver_status))
 408                 return 0;
 409         if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
 410             (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
 411             (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
 412                 if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
 413                         int sense_key;
 414                         unsigned char * sense_buffer = io_hdr.sbp;
 415                         if (sense_buffer[0] & 0x2)
 416                                 sense_key = sense_buffer[1] & 0xf;
 417                         else
 418                                 sense_key = sense_buffer[2] & 0xf;
 419                         if(RECOVERED_ERROR == sense_key)
 420                                 return 0;
 421                 }
 422         }
 423         return -1;
 424 }
 425
 426 static int
 427 get_serial (char * str, int maxlen, int fd)
 428 {
 429         int len = 0;
 430         char buff[MX_ALLOC_LEN + 1] = {0};
 431
 432         if (fd < 0)
 433                 return 1;
 434
 435         if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN)) {
 436                 len = buff[3];
 437                 if (len >= maxlen)
 438                         return 1;
 439                 if (len > 0) {
 440                         memcpy(str, buff + 4, len);
 441                         str[len] = '\0';
 442                 }
 443                 return 0;
 444         }
 445         return 1;
 446 }
 447
 448 static int
 449 get_geometry(struct path *pp)
 450 {
 451         if (pp->fd < 0)
 452                 return 1;
 453
 454         if (ioctl(pp->fd, HDIO_GETGEO, &pp->geom)) {
 455                 condlog(2, "%s: HDIO_GETGEO failed with %d", pp->dev, errno);
 456                 memset(&pp->geom, 0, sizeof(pp->geom));
 457                 return 1;
 458         }
 459         condlog(3, "%s: %u cyl, %u heads, %u sectors/track, start at %lu",
 460                 pp->dev, pp->geom.cylinders, pp->geom.heads,
 461                 pp->geom.sectors, pp->geom.start);
 462         return 0;
 463 }
 464
 465 static int
 466 scsi_sysfs_pathinfo (struct path * pp)
 467 {
 468         struct udev_device *parent;
 469         const char *attr_path = NULL;
 470
 471         parent = pp->udev;
 472         while (parent) {
 473                 const char *subsys = udev_device_get_subsystem(parent);
 474                 if (subsys && !strncmp(subsys, "scsi", 4)) {
 475                         attr_path = udev_device_get_sysname(parent);
 476                         if (!attr_path)
 477                                 break;
 478                         if (sscanf(attr_path, "%i:%i:%i:%i",
 479                                    &pp->sg_id.host_no,
 480                                    &pp->sg_id.channel,
 481                                    &pp->sg_id.scsi_id,
 482                                    &pp->sg_id.lun) == 4)
 483                                 break;
 484                 }
 485                 parent = udev_device_get_parent(parent);
 486         }
 487         if (!attr_path || pp->sg_id.host_no == -1)
 488                 return 1;
 489
 490         if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
 491                 return 1;
 492
 493         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 494
 495         if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
 496                 return 1;
 497
 498         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 499
 500         if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
 501                 return 1;
 502
 503         condlog(3, "%s: rev = %s", pp->dev, pp->rev);
 504
 505         /*
 506          * set the hwe configlet pointer
 507          */
 508         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, pp->rev);
 509
 510         /*
 511          * host / bus / target / lun
 512          */
 513         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 514                         pp->dev,
 515                         pp->sg_id.host_no,
 516                         pp->sg_id.channel,
 517                         pp->sg_id.scsi_id,
 518                         pp->sg_id.lun);
 519
 520         /*
 521          * target node name
 522          */
 523         if(!sysfs_get_tgt_nodename(pp, pp->tgt_node_name)) {
 524                 condlog(3, "%s: tgt_node_name = %s",
 525                         pp->dev, pp->tgt_node_name);
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int
 532 ccw_sysfs_pathinfo (struct path * pp)
 533 {
 534         struct udev_device *parent;
 535         char attr_buff[NAME_SIZE];
 536         const char *attr_path;
 537
 538         parent = pp->udev;
 539         while (parent) {
 540                 const char *subsys = udev_device_get_subsystem(parent);
 541                 if (subsys && !strncmp(subsys, "ccw", 3))
 542                         break;
 543                 parent = udev_device_get_parent(parent);
 544         }
 545         if (!parent)
 546                 return 1;
 547
 548         sprintf(pp->vendor_id, "IBM");
 549
 550         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 551
 552         if (sysfs_get_devtype(parent, attr_buff, FILE_NAME_SIZE))
 553                 return 1;
 554
 555         if (!strncmp(attr_buff, "3370", 4)) {
 556                 sprintf(pp->product_id,"S/390 DASD FBA");
 557         } else if (!strncmp(attr_buff, "9336", 4)) {
 558                 sprintf(pp->product_id,"S/390 DASD FBA");
 559         } else {
 560                 sprintf(pp->product_id,"S/390 DASD ECKD");
 561         }
 562
 563         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 564
 565         /*
 566          * set the hwe configlet pointer
 567          */
 568         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, NULL);
 569
 570         /*
 571          * host / bus / target / lun
 572          */
 573         attr_path = udev_device_get_sysname(parent);
 574         pp->sg_id.lun = 0;
 575         sscanf(attr_path, "%i.%i.%x",
 576                         &pp->sg_id.host_no,
 577                         &pp->sg_id.channel,
 578                         &pp->sg_id.scsi_id);
 579         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 580                         pp->dev,
 581                         pp->sg_id.host_no,
 582                         pp->sg_id.channel,
 583                         pp->sg_id.scsi_id,
 584                         pp->sg_id.lun);
 585
 586         return 0;
 587 }
 588
 589 static int
 590 cciss_sysfs_pathinfo (struct path * pp)
 591 {
 592         const char * attr_path = NULL;
 593         struct udev_device *parent;
 594
 595         parent = pp->udev;
 596         while (parent) {
 597                 const char *subsys = udev_device_get_subsystem(parent);
 598                 if (subsys && !strncmp(subsys, "cciss", 5)) {
 599                         attr_path = udev_device_get_sysname(parent);
 600                         if (!attr_path)
 601                                 break;
 602                         if (sscanf(attr_path, "c%id%i",
 603                                    &pp->sg_id.host_no,
 604                                    &pp->sg_id.scsi_id) == 2)
 605                                 break;
 606                 }
 607                 parent = udev_device_get_parent(parent);
 608         }
 609         if (!attr_path || pp->sg_id.host_no == -1)
 610                 return 1;
 611
 612         if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
 613                 return 1;
 614
 615         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 616
 617         if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
 618                 return 1;
 619
 620         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 621
 622         if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
 623                 return 1;
 624
 625         condlog(3, "%s: rev = %s", pp->dev, pp->rev);
 626
 627         /*
 628          * set the hwe configlet pointer
 629          */
 630         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, pp->rev);
 631
 632         /*
 633          * host / bus / target / lun
 634          */
 635         pp->sg_id.lun = 0;
 636         pp->sg_id.channel = 0;
 637         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 638                 pp->dev,
 639                 pp->sg_id.host_no,
 640                 pp->sg_id.channel,
 641                 pp->sg_id.scsi_id,
 642                 pp->sg_id.lun);
 643         return 0;
 644 }
 645
 646 static int
 647 common_sysfs_pathinfo (struct path * pp)
 648 {
 649         if (!pp->udev) {
 650                 condlog(4, "%s: udev not initialised", pp->dev);
 651                 return 1;
 652         }
 653         if (sysfs_get_dev(pp->udev, pp->dev_t, BLK_DEV_SIZE)) {
 654                 condlog(3, "%s: no 'dev' attribute in sysfs", pp->dev);
 655                 return 1;
 656         }
 657
 658         condlog(3, "%s: dev_t = %s", pp->dev, pp->dev_t);
 659
 660         if (sysfs_get_size(pp, &pp->size))
 661                 return 1;
 662
 663         condlog(3, "%s: size = %llu", pp->dev, pp->size);
 664
 665         return 0;
 666 }
 667
 668 int
 669 path_offline (struct path * pp)
 670 {
 671         struct udev_device * parent;
 672         char buff[SCSI_STATE_SIZE];
 673
 674         if (pp->bus != SYSFS_BUS_SCSI)
 675                 return PATH_UP;
 676
 677         parent = pp->udev;
 678         while (parent) {
 679                 const char *subsys = udev_device_get_subsystem(parent);
 680                 if (subsys && !strncmp(subsys, "scsi", 4))
 681                         break;
 682                 parent = udev_device_get_parent(parent);
 683         }
 684
 685         if (!parent) {
 686                 condlog(1, "%s: failed to get sysfs information", pp->dev);
 687                 return PATH_DOWN;
 688         }
 689
 690         if (sysfs_get_state(parent, buff, SCSI_STATE_SIZE))
 691                 return PATH_DOWN;
 692
 693         condlog(3, "%s: path state = %s", pp->dev, buff);
 694
 695         if (!strncmp(buff, "offline", 7)) {
 696                 pp->offline = 1;
 697                 return PATH_DOWN;
 698         }
 699         pp->offline = 0;
 700         if (!strncmp(buff, "blocked", 7))
 701                 return PATH_PENDING;
 702         else if (!strncmp(buff, "running", 7))
 703                 return PATH_UP;
 704
 705         return PATH_DOWN;
 706 }
 707
 708 int
 709 sysfs_pathinfo(struct path * pp)
 710 {
 711         if (common_sysfs_pathinfo(pp))
 712                 return 1;
 713
 714         pp->bus = SYSFS_BUS_UNDEF;
 715         if (!strncmp(pp->dev,"cciss",5))
 716                 pp->bus = SYSFS_BUS_CCISS;
 717         if (!strncmp(pp->dev,"dasd", 4))
 718                 pp->bus = SYSFS_BUS_CCW;
 719         if (!strncmp(pp->dev,"sd", 2))
 720                 pp->bus = SYSFS_BUS_SCSI;
 721
 722         if (pp->bus == SYSFS_BUS_UNDEF)
 723                 return 0;
 724         else if (pp->bus == SYSFS_BUS_SCSI) {
 725                 if (scsi_sysfs_pathinfo(pp))
 726                         return 1;
 727         } else if (pp->bus == SYSFS_BUS_CCW) {
 728                 if (ccw_sysfs_pathinfo(pp))
 729                         return 1;
 730         } else if (pp->bus == SYSFS_BUS_CCISS) {
 731                 if (cciss_sysfs_pathinfo(pp))
 732                         return 1;
 733         }
 734         return 0;
 735 }
 736
 737 static int
 738 scsi_ioctl_pathinfo (struct path * pp, int mask)
 739 {
 740         if (mask & DI_SERIAL) {
 741                 get_serial(pp->serial, SERIAL_SIZE, pp->fd);
 742                 condlog(3, "%s: serial = %s", pp->dev, pp->serial);
 743         }
 744
 745         return 0;
 746 }
 747
 748 static int
 749 cciss_ioctl_pathinfo (struct path * pp, int mask)
 750 {
 751         if (mask & DI_SERIAL) {
 752                 get_serial(pp->serial, SERIAL_SIZE, pp->fd);
 753                 condlog(3, "%s: serial = %s", pp->dev, pp->serial);
 754         }
 755         return 0;
 756 }
 757
 758 int
 759 get_state (struct path * pp, int daemon)
 760 {
 761         struct checker * c = &pp->checker;
 762         int state;
 763
 764         condlog(3, "%s: get_state", pp->dev);
 765
 766         if (!checker_selected(c)) {
 767                 if (daemon) {
 768                         if (pathinfo(pp, conf->hwtable, DI_SYSFS) != 0) {
 769                                 condlog(3, "%s: couldn't get sysfs pathinfo",
 770                                         pp->dev);
 771                                 return PATH_UNCHECKED;
 772                         }
 773                 }
 774                 select_checker(pp);
 775                 if (!checker_selected(c)) {
 776                         condlog(3, "%s: No checker selected", pp->dev);
 777                         return PATH_UNCHECKED;
 778                 }
 779                 checker_set_fd(c, pp->fd);
 780                 if (checker_init(c, pp->mpp?&pp->mpp->mpcontext:NULL)) {
 781                         memset(c, 0x0, sizeof(struct checker));
 782                         condlog(3, "%s: checker init failed", pp->dev);
 783                         return PATH_UNCHECKED;
 784                 }
 785         }
 786         checker_clear_message(c);
 787         if (daemon)
 788                 checker_set_async(c);
 789         if (!conf->checker_timeout &&
 790             (pp->bus != SYSFS_BUS_SCSI ||
 791              sysfs_get_timeout(pp, &(c->timeout))))
 792                 c->timeout = DEF_TIMEOUT;
 793         state = checker_check(c);
 794         condlog(3, "%s: state = %s", pp->dev, checker_state_name(state));
 795         if (state != PATH_UP && strlen(checker_message(c)))
 796                 condlog(3, "%s: checker msg is \"%s\"",
 797                         pp->dev, checker_message(c));
 798         return state;
 799 }
 800
 801 static int
 802 get_prio (struct path * pp)
 803 {
 804         if (!pp)
 805                 return 0;
 806
 807         struct prio * p = &pp->prio;
 808
 809         if (!prio_selected(p)) {
 810                 select_detect_prio(pp);
 811                 select_prio(pp);
 812                 if (!prio_selected(p)) {
 813                         condlog(3, "%s: no prio selected", pp->dev);
 814                         return 1;
 815                 }
 816         }
 817         pp->priority = prio_getprio(p, pp);
 818         if (pp->priority < 0) {
 819                 condlog(3, "%s: %s prio error", pp->dev, prio_name(p));
 820                 pp->priority = PRIO_UNDEF;
 821                 return 1;
 822         }
 823         condlog(3, "%s: %s prio = %u",
 824                 pp->dev, prio_name(p), pp->priority);
 825         return 0;
 826 }
 827
 828 static int
 829 get_uid (struct path * pp)
 830 {
 831         char *c;
 832         const char *value;
 833
 834         if (!pp->uid_attribute)
 835                 select_getuid(pp);
 836
 837         if (!pp->udev) {
 838                 condlog(1, "%s: no udev information", pp->dev);
 839                 return 1;
 840         }
 841
 842         memset(pp->wwid, 0, WWID_SIZE);
 843         value = udev_device_get_property_value(pp->udev, pp->uid_attribute);
 844         if ((!value || strlen(value) == 0) && conf->dry_run == 2)
 845                 value = getenv(pp->uid_attribute);
 846         if (value && strlen(value)) {
 847                 size_t len = WWID_SIZE;
 848
 849                 if (strlen(value) + 1 > WWID_SIZE) {
 850                         condlog(0, "%s: wwid overflow", pp->dev);
 851                 } else {
 852                         len = strlen(value);
 853                 }
 854                 strncpy(pp->wwid, value, len);
 855         } else {
 856                 condlog(3, "%s: no %s attribute", pp->dev,
 857                         pp->uid_attribute);
 858         }
 859
 860         /* Strip any trailing blanks */
 861         c = strchr(pp->wwid, '\0');
 862         c--;
 863         while (c && c >= pp->wwid && *c == ' ') {
 864                 *c = '\0';
 865                 c--;
 866         }
 867         condlog(3, "%s: uid = %s (udev)", pp->dev,
 868                 *pp->wwid == '\0' ? "<empty>" : pp->wwid);
 869         return 0;
 870 }
 871
 872 extern int
 873 pathinfo (struct path *pp, vector hwtable, int mask)
 874 {
 875         int path_state;
 876
 877         condlog(3, "%s: mask = 0x%x", pp->dev, mask);
 878
 879         /*
 880          * fetch info available in sysfs
 881          */
 882         if (mask & DI_SYSFS && sysfs_pathinfo(pp))
 883                 return 1;
 884
 885         if (mask & DI_BLACKLIST && mask & DI_SYSFS) {
 886                 if (filter_device(conf->blist_device, conf->elist_device,
 887                                   pp->vendor_id, pp->product_id) > 0) {
 888                         return 2;
 889                 }
 890         }
 891
 892         path_state = path_offline(pp);
 893
 894         /*
 895          * fetch info not available through sysfs
 896          */
 897         if (pp->fd < 0)
 898                 pp->fd = open(udev_device_get_devnode(pp->udev), O_RDONLY);
 899
 900         if (pp->fd < 0) {
 901                 condlog(4, "Couldn't open node for %s: %s",
 902                         pp->dev, strerror(errno));
 903                 goto blank;
 904         }
 905
 906         if (mask & DI_SERIAL)
 907                 get_geometry(pp);
 908
 909         if (path_state == PATH_UP && pp->bus == SYSFS_BUS_SCSI &&
 910             scsi_ioctl_pathinfo(pp, mask))
 911                 goto blank;
 912
 913         if (pp->bus == SYSFS_BUS_CCISS &&
 914             cciss_ioctl_pathinfo(pp, mask))
 915                 goto blank;
 916
 917         if (mask & DI_CHECKER) {
 918                 if (path_state == PATH_UP) {
 919                         pp->chkrstate = pp->state = get_state(pp, 0);
 920                         if (pp->state == PATH_UNCHECKED ||
 921                             pp->state == PATH_WILD)
 922                                 goto blank;
 923                 } else {
 924                         condlog(3, "%s: path inaccessible", pp->dev);
 925                         pp->chkrstate = pp->state = path_state;
 926                 }
 927         }
 928
 929         if (path_state == PATH_UP && (mask & DI_WWID) && !strlen(pp->wwid))
 930                 get_uid(pp);
 931         if (mask & DI_BLACKLIST && mask & DI_WWID) {
 932                 if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
 933                                 pp->wwid) > 0) {
 934                         return 2;
 935                 }
 936         }
 937
 938          /*
 939           * Retrieve path priority, even for PATH_DOWN paths if it has never
 940           * been successfully obtained before.
 941           */
 942         if ((mask & DI_PRIO) && path_state == PATH_UP) {
 943                 if (pp->state != PATH_DOWN || pp->priority == PRIO_UNDEF) {
 944                         if (!strlen(pp->wwid))
 945                                 get_uid(pp);
 946                         get_prio(pp);
 947                 } else {
 948                         pp->priority = PRIO_UNDEF;
 949                 }
 950         }
 951
 952         return 0;
 953
 954 blank:
 955         /*
 956          * Recoverable error, for example faulty or offline path
 957          */
 958         memset(pp->wwid, 0, WWID_SIZE);
 959         pp->chkrstate = pp->state = PATH_DOWN;
 960
 961         return 0;
 962 }