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 "callout.h"
  24 #include "debug.h"
  25 #include "propsel.h"
  26 #include "sg_include.h"
  27 #include "sysfs.h"
  28 #include "discovery.h"
  29 #include "prio.h"
  30 #include "defaults.h"
  31
  32 int
  33 store_pathinfo (vector pathvec, vector hwtable, struct udev_device *udevice,
  34                 int flag, struct path **pp_ptr)
  35 {
  36         int err = 1;
  37         struct path * pp;
  38         const char * devname;
  39
  40         if (pp_ptr)
  41                 *pp_ptr = NULL;
  42
  43         devname = udev_device_get_sysname(udevice);
  44         if (!devname)
  45                 return 1;
  46
  47         pp = alloc_path();
  48
  49         if (!pp)
  50                 return 1;
  51
  52         if(safe_sprintf(pp->dev, "%s", devname)) {
  53                 condlog(0, "pp->dev too small");
  54                 goto out;
  55         }
  56         pp->udev = udev_device_ref(udevice);
  57         err = pathinfo(pp, hwtable,
  58                        (conf->dry_run == 3)? flag : (flag | DI_BLACKLIST));
  59         if (err)
  60                 goto out;
  61
  62         err = store_path(pathvec, pp);
  63         if (err)
  64                 goto out;
  65
  66 out:
  67         if (err)
  68                 free_path(pp);
  69         else if (pp_ptr)
  70                 *pp_ptr = pp;
  71         return err;
  72 }
  73
  74 static int
  75 path_discover (vector pathvec, struct config * conf,
  76                struct udev_device *udevice, int flag)
  77 {
  78         struct path * pp;
  79         const char * devname;
  80
  81         devname = udev_device_get_sysname(udevice);
  82         if (!devname)
  83                 return 0;
  84
  85         if (filter_property(conf, udevice) > 0)
  86                 return 0;
  87
  88         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
  89                            (char *)devname) > 0)
  90                 return 0;
  91
  92         pp = find_path_by_dev(pathvec, (char *)devname);
  93         if (!pp) {
  94                 if (store_pathinfo(pathvec, conf->hwtable,
  95                                    udevice, flag, NULL) != 1)
  96                         return 0;
  97                 else
  98                         return 1;
  99         }
 100         return pathinfo(pp, conf->hwtable, flag);
 101 }
 102
 103 int
 104 path_discovery (vector pathvec, struct config * conf, int flag)
 105 {
 106         struct udev_enumerate *udev_iter;
 107         struct udev_list_entry *entry;
 108         struct udev_device *udevice;
 109         const char *devpath;
 110         int r = 0;
 111
 112         udev_iter = udev_enumerate_new(conf->udev);
 113         if (!udev_iter)
 114                 return 1;
 115
 116         udev_enumerate_add_match_subsystem(udev_iter, "block");
 117         udev_enumerate_scan_devices(udev_iter);
 118
 119         udev_list_entry_foreach(entry,
 120                                 udev_enumerate_get_list_entry(udev_iter)) {
 121                 const char *devtype;
 122                 devpath = udev_list_entry_get_name(entry);
 123                 condlog(4, "Discover device %s", devpath);
 124                 udevice = udev_device_new_from_syspath(conf->udev, devpath);
 125                 if (!udevice) {
 126                         condlog(4, "%s: no udev information", devpath);
 127                         r++;
 128                         continue;
 129                 }
 130                 devtype = udev_device_get_devtype(udevice);
 131                 if(devtype && !strncmp(devtype, "disk", 4)) {
 132                         r += path_discover(pathvec, conf,
 133                                                    udevice, flag);
 134                 }
 135                 udev_device_unref(udevice);
 136         }
 137         udev_enumerate_unref(udev_iter);
 138         condlog(4, "Discovery status %d", r);
 139         return r;
 140 }
 141
 142 #define declare_sysfs_get_str(fname)                                    \
 143 extern int                                                              \
 144 sysfs_get_##fname (struct udev_device * udev, char * buff, size_t len)  \
 145 {                                                                       \
 146         const char * attr;                                              \
 147         const char * devname;                                           \
 148                                                                         \
 149         devname = udev_device_get_sysname(udev);                        \
 150                                                                         \
 151         attr = udev_device_get_sysattr_value(udev, #fname);             \
 152         if (!attr) {                                                    \
 153                 condlog(3, "%s: attribute %s not found in sysfs",       \
 154                         devname, #fname);                               \
 155                 return 1;                                               \
 156         }                                                               \
 157         if (strlen(attr) > len) {                                       \
 158                 condlog(3, "%s: overflow in attribute %s",              \
 159                         devname, #fname);                               \
 160                 return 2;                                               \
 161         }                                                               \
 162         strlcpy(buff, attr, len);                                       \
 163         return 0;                                                       \
 164 }
 165
 166 declare_sysfs_get_str(devtype);
 167 declare_sysfs_get_str(cutype);
 168 declare_sysfs_get_str(vendor);
 169 declare_sysfs_get_str(model);
 170 declare_sysfs_get_str(rev);
 171 declare_sysfs_get_str(dev);
 172
 173 int
 174 sysfs_get_timeout(struct path *pp, unsigned int *timeout)
 175 {
 176         const char *attr = NULL;
 177         const char *subsys;
 178         struct udev_device *parent;
 179         int r;
 180         unsigned int t;
 181
 182         if (!pp->udev || pp->bus != SYSFS_BUS_SCSI)
 183                 return 1;
 184
 185         parent = pp->udev;
 186         while (parent) {
 187                 subsys = udev_device_get_subsystem(parent);
 188                 attr = udev_device_get_sysattr_value(parent, "timeout");
 189                 if (subsys && attr)
 190                         break;
 191                 parent = udev_device_get_parent(parent);
 192         }
 193         if (!attr) {
 194                 condlog(3, "%s: No timeout value in sysfs", pp->dev);
 195                 return 1;
 196         }
 197
 198         r = sscanf(attr, "%u\n", &t);
 199
 200         if (r != 1) {
 201                 condlog(3, "%s: Cannot parse timeout attribute '%s'",
 202                         pp->dev, attr);
 203                 return 1;
 204         }
 205
 206         *timeout = t;
 207
 208         return 0;
 209 }
 210
 211 int
 212 sysfs_get_tgt_nodename (struct path *pp, char * node)
 213 {
 214         const char *tgtname, *value;
 215         struct udev_device *parent, *tgtdev;
 216         int host, channel, tgtid = -1;
 217
 218         parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "scsi", "scsi_device");
 219         if (!parent)
 220                 return 1;
 221         /* Check for SAS */
 222         value = udev_device_get_sysattr_value(parent, "sas_address");
 223         if (value) {
 224                 tgtdev = udev_device_get_parent(parent);
 225                 while (tgtdev) {
 226                         tgtname = udev_device_get_sysname(tgtdev);
 227                         if (sscanf(tgtname, "end_device-%d:%d",
 228                                    &host, &tgtid) == 2)
 229                                 break;
 230                         tgtdev = udev_device_get_parent(tgtdev);
 231                         tgtid = -1;
 232                 }
 233                 if (tgtid >= 0) {
 234                         pp->sg_id.proto_id = SCSI_PROTOCOL_SAS;
 235                         pp->sg_id.transport_id = tgtid;
 236                         strncpy(node, value, NODE_NAME_SIZE);
 237                         return 0;
 238                 }
 239         }
 240
 241         parent = udev_device_get_parent_with_subsystem_devtype(pp->udev, "scsi", "scsi_target");
 242         if (!parent)
 243                 return 1;
 244         /* Check for FibreChannel */
 245         tgtdev = udev_device_get_parent(parent);
 246         value = udev_device_get_sysname(tgtdev);
 247         if (sscanf(value, "rport-%d:%d-%d",
 248                    &host, &channel, &tgtid) == 3) {
 249                 tgtdev = udev_device_new_from_subsystem_sysname(conf->udev,
 250                                 "fc_remote_ports", value);
 251                 if (tgtdev) {
 252                         condlog(3, "SCSI target %d:%d:%d -> "
 253                                 "FC rport %d:%d-%d",
 254                                 pp->sg_id.host_no, pp->sg_id.channel,
 255                                 pp->sg_id.scsi_id, host, channel,
 256                                 tgtid);
 257                         value = udev_device_get_sysattr_value(tgtdev,
 258                                                               "node_name");
 259                         if (value) {
 260                                 pp->sg_id.proto_id = SCSI_PROTOCOL_FCP;
 261                                 pp->sg_id.transport_id = tgtid;
 262                                 strncpy(node, value, NODE_NAME_SIZE);
 263                                 udev_device_unref(tgtdev);
 264                                 return 0;
 265                         } else
 266                                 udev_device_unref(tgtdev);
 267                 }
 268         }
 269
 270         /* Check for iSCSI */
 271         parent = pp->udev;
 272         tgtname = NULL;
 273         while (parent) {
 274                 tgtname = udev_device_get_sysname(parent);
 275                 if (tgtname && sscanf(tgtname , "session%d", &tgtid) == 1)
 276                         break;
 277                 parent = udev_device_get_parent(parent);
 278                 tgtname = NULL;
 279                 tgtid = -1;
 280         }
 281         if (parent && tgtname) {
 282                 tgtdev = udev_device_new_from_subsystem_sysname(conf->udev,
 283                                 "iscsi_session", tgtname);
 284                 if (tgtdev) {
 285                         const char *value;
 286
 287                         value = udev_device_get_sysattr_value(tgtdev, "tgtname");
 288                         if (value) {
 289                                 pp->sg_id.proto_id = SCSI_PROTOCOL_ISCSI;
 290                                 pp->sg_id.transport_id = tgtid;
 291                                 strncpy(node, value, NODE_NAME_SIZE);
 292                                 udev_device_unref(tgtdev);
 293                                 return 0;
 294                         }
 295                         else
 296                                 udev_device_unref(tgtdev);
 297                 }
 298         }
 299         /* Check for libata */
 300         parent = pp->udev;
 301         tgtname = NULL;
 302         while (parent) {
 303                 tgtname = udev_device_get_sysname(parent);
 304                 if (tgtname && sscanf(tgtname, "ata%d", &tgtid) == 1)
 305                         break;
 306                 parent = udev_device_get_parent(parent);
 307                 tgtname = NULL;
 308         }
 309         if (tgtname) {
 310                 pp->sg_id.proto_id = SCSI_PROTOCOL_ATA;
 311                 pp->sg_id.transport_id = tgtid;
 312                 snprintf(node, NODE_NAME_SIZE, "ata-%d.00", tgtid);
 313                 return 0;
 314         }
 315         pp->sg_id.proto_id = SCSI_PROTOCOL_UNSPEC;
 316         return 1;
 317 }
 318
 319 static void
 320 sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp)
 321 {
 322         struct udev_device *rport_dev = NULL;
 323         char value[16];
 324         char rport_id[32];
 325         unsigned long long tmo = 0;
 326         int ret;
 327
 328         sprintf(rport_id, "rport-%d:%d-%d",
 329                 pp->sg_id.host_no, pp->sg_id.channel, pp->sg_id.transport_id);
 330         rport_dev = udev_device_new_from_subsystem_sysname(conf->udev,
 331                                 "fc_remote_ports", rport_id);
 332         if (!rport_dev) {
 333                 condlog(1, "%s: No fc_remote_port device for '%s'", pp->dev,
 334                         rport_id);
 335                 return;
 336         }
 337         condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no,
 338                 pp->sg_id.channel, pp->sg_id.scsi_id, rport_id);
 339
 340         /*
 341          * This is tricky.
 342          * dev_loss_tmo will be limited to 600 if fast_io_fail
 343          * is _not_ set.
 344          * fast_io_fail will be limited by the current dev_loss_tmo
 345          * setting.
 346          * So to get everything right we first need to increase
 347          * dev_loss_tmo to the fast_io_fail setting (if present),
 348          * then set fast_io_fail, and _then_ set dev_loss_tmo
 349          * to the correct value.
 350          */
 351         memset(value, 0, 16);
 352         if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET &&
 353             mpp->fast_io_fail != MP_FAST_IO_FAIL_ZERO &&
 354             mpp->fast_io_fail != MP_FAST_IO_FAIL_OFF) {
 355                 /* Check if we need to temporarily increase dev_loss_tmo */
 356                 ret = sysfs_attr_get_value(rport_dev, "dev_loss_tmo",
 357                                            value, 16);
 358                 if (ret <= 0) {
 359                         condlog(0, "%s: failed to read dev_loss_tmo value, "
 360                                 "error %d", rport_id, -ret);
 361                         goto out;
 362                 }
 363                 if (sscanf(value, "%llu\n", &tmo) != 1) {
 364                         condlog(0, "%s: Cannot parse dev_loss_tmo "
 365                                 "attribute '%s'", rport_id, value);
 366                         goto out;
 367                 }
 368                 if (mpp->fast_io_fail >= tmo) {
 369                         snprintf(value, 16, "%u", mpp->fast_io_fail);
 370                 }
 371         } else if (mpp->dev_loss > 600) {
 372                 condlog(3, "%s: limiting dev_loss_tmo to 600, since "
 373                         "fast_io_fail is not set", rport_id);
 374                 snprintf(value, 16, "%u", 600);
 375         } else {
 376                 snprintf(value, 16, "%u", mpp->dev_loss);
 377         }
 378         if (strlen(value)) {
 379                 ret = sysfs_attr_set_value(rport_dev, "dev_loss_tmo",
 380                                            value, strlen(value));
 381                 if (ret <= 0) {
 382                         if (ret == -EBUSY)
 383                                 condlog(3, "%s: rport blocked", rport_id);
 384                         else
 385                                 condlog(0, "%s: failed to set dev_loss_tmo to %s, error %d",
 386                                         rport_id, value, -ret);
 387                         goto out;
 388                 }
 389         }
 390         if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) {
 391                 if (mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF)
 392                         sprintf(value, "off");
 393                 else if (mpp->fast_io_fail == MP_FAST_IO_FAIL_ZERO)
 394                         sprintf(value, "0");
 395                 else
 396                         snprintf(value, 16, "%u", mpp->fast_io_fail);
 397                 ret = sysfs_attr_set_value(rport_dev, "fast_io_fail_tmo",
 398                                            value, strlen(value));
 399                 if (ret <= 0) {
 400                         if (ret == -EBUSY)
 401                                 condlog(3, "%s: rport blocked", rport_id);
 402                         else
 403                                 condlog(0, "%s: failed to set fast_io_fail_tmo to %s, error %d",
 404                                         rport_id, value, -ret);
 405                 }
 406         }
 407         if (tmo > 0) {
 408                 snprintf(value, 16, "%u", mpp->dev_loss);
 409                 ret = sysfs_attr_set_value(rport_dev, "dev_loss_tmo",
 410                                            value, strlen(value));
 411                 if (ret <= 0) {
 412                         if (ret == -EBUSY)
 413                                 condlog(3, "%s: rport blocked", rport_id);
 414                         else
 415                                 condlog(0, "%s: failed to set dev_loss_tmo to %s, error %d",
 416                                         rport_id, value, -ret);
 417                 }
 418         }
 419 out:
 420         udev_device_unref(rport_dev);
 421 }
 422
 423 static void
 424 sysfs_set_session_tmo(struct multipath *mpp, struct path *pp)
 425 {
 426         struct udev_device *session_dev = NULL;
 427         char session_id[64];
 428         char value[11];
 429
 430         sprintf(session_id, "session%d", pp->sg_id.transport_id);
 431         session_dev = udev_device_new_from_subsystem_sysname(conf->udev,
 432                                 "iscsi_session", session_id);
 433         if (!session_dev) {
 434                 condlog(1, "%s: No iscsi session for '%s'", pp->dev,
 435                         session_id);
 436                 return;
 437         }
 438         condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no,
 439                 pp->sg_id.channel, pp->sg_id.scsi_id, session_id);
 440
 441         if (mpp->dev_loss) {
 442                 condlog(3, "%s: ignoring dev_loss_tmo on iSCSI", pp->dev);
 443         }
 444         if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) {
 445                 if (mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF) {
 446                         condlog(3, "%s: can't switch off fast_io_fail_tmo "
 447                                 "on iSCSI", pp->dev);
 448                 } else if (mpp->fast_io_fail == MP_FAST_IO_FAIL_ZERO) {
 449                         condlog(3, "%s: can't set fast_io_fail_tmo to '0'"
 450                                 "on iSCSI", pp->dev);
 451                 } else {
 452                         snprintf(value, 11, "%u", mpp->fast_io_fail);
 453                         if (sysfs_attr_set_value(session_dev, "recovery_tmo",
 454                                                  value, 11) <= 0) {
 455                                 condlog(3, "%s: Failed to set recovery_tmo, "
 456                                         " error %d", pp->dev, errno);
 457                         }
 458                 }
 459         }
 460         udev_device_unref(session_dev);
 461         return;
 462 }
 463
 464 static void
 465 sysfs_set_nexus_loss_tmo(struct multipath *mpp, struct path *pp)
 466 {
 467         struct udev_device *sas_dev = NULL;
 468         char end_dev_id[64];
 469         char value[11];
 470
 471         sprintf(end_dev_id, "end_device-%d:%d",
 472                 pp->sg_id.host_no, pp->sg_id.transport_id);
 473         sas_dev = udev_device_new_from_subsystem_sysname(conf->udev,
 474                                 "sas_end_device", end_dev_id);
 475         if (!sas_dev) {
 476                 condlog(1, "%s: No SAS end device for '%s'", pp->dev,
 477                         end_dev_id);
 478                 return;
 479         }
 480         condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no,
 481                 pp->sg_id.channel, pp->sg_id.scsi_id, end_dev_id);
 482
 483         if (mpp->dev_loss) {
 484                 snprintf(value, 11, "%u", mpp->dev_loss);
 485                 if (sysfs_attr_set_value(sas_dev, "I_T_nexus_loss_timeout",
 486                                          value, 11) <= 0)
 487                         condlog(3, "%s: failed to update "
 488                                 "I_T Nexus loss timeout, error %d",
 489                                 pp->dev, errno);
 490         }
 491         udev_device_unref(sas_dev);
 492         return;
 493 }
 494
 495 int
 496 sysfs_set_scsi_tmo (struct multipath *mpp)
 497 {
 498         struct path *pp;
 499         int i;
 500         int dev_loss_tmo = mpp->dev_loss;
 501
 502         if (mpp->no_path_retry > 0) {
 503                 int no_path_retry_tmo = mpp->no_path_retry * conf->checkint;
 504
 505                 if (no_path_retry_tmo > MAX_DEV_LOSS_TMO)
 506                         no_path_retry_tmo = MAX_DEV_LOSS_TMO;
 507                 if (no_path_retry_tmo > dev_loss_tmo)
 508                         dev_loss_tmo = no_path_retry_tmo;
 509                 condlog(3, "%s: update dev_loss_tmo to %d",
 510                         mpp->alias, dev_loss_tmo);
 511         } else if (mpp->no_path_retry == NO_PATH_RETRY_QUEUE) {
 512                 dev_loss_tmo = MAX_DEV_LOSS_TMO;
 513                 condlog(3, "%s: update dev_loss_tmo to %d",
 514                         mpp->alias, dev_loss_tmo);
 515         }
 516         mpp->dev_loss = dev_loss_tmo;
 517         if (mpp->dev_loss && mpp->fast_io_fail >= (int)mpp->dev_loss) {
 518                 condlog(3, "%s: turning off fast_io_fail (%d is not smaller than dev_loss_tmo)",
 519                         mpp->alias, mpp->fast_io_fail);
 520                 mpp->fast_io_fail = MP_FAST_IO_FAIL_OFF;
 521         }
 522         if (!mpp->dev_loss && mpp->fast_io_fail == MP_FAST_IO_FAIL_UNSET)
 523                 return 0;
 524
 525         vector_foreach_slot(mpp->paths, pp, i) {
 526                 if (pp->sg_id.proto_id == SCSI_PROTOCOL_FCP)
 527                         sysfs_set_rport_tmo(mpp, pp);
 528                 if (pp->sg_id.proto_id == SCSI_PROTOCOL_ISCSI)
 529                         sysfs_set_session_tmo(mpp, pp);
 530                 if (pp->sg_id.proto_id == SCSI_PROTOCOL_SAS)
 531                         sysfs_set_nexus_loss_tmo(mpp, pp);
 532         }
 533         return 0;
 534 }
 535
 536 int
 537 do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
 538        void *resp, int mx_resp_len)
 539 {
 540         unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
 541                 { INQUIRY_CMD, 0, 0, 0, 0, 0 };
 542         unsigned char sense_b[SENSE_BUFF_LEN];
 543         struct sg_io_hdr io_hdr;
 544
 545         if (cmddt)
 546                 inqCmdBlk[1] |= 2;
 547         if (evpd)
 548                 inqCmdBlk[1] |= 1;
 549         inqCmdBlk[2] = (unsigned char) pg_op;
 550         inqCmdBlk[3] = (unsigned char)((mx_resp_len >> 8) & 0xff);
 551         inqCmdBlk[4] = (unsigned char) (mx_resp_len & 0xff);
 552         memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
 553         memset(sense_b, 0, SENSE_BUFF_LEN);
 554         io_hdr.interface_id = 'S';
 555         io_hdr.cmd_len = sizeof (inqCmdBlk);
 556         io_hdr.mx_sb_len = sizeof (sense_b);
 557         io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 558         io_hdr.dxfer_len = mx_resp_len;
 559         io_hdr.dxferp = resp;
 560         io_hdr.cmdp = inqCmdBlk;
 561         io_hdr.sbp = sense_b;
 562         io_hdr.timeout = DEF_TIMEOUT;
 563
 564         if (ioctl(sg_fd, SG_IO, &io_hdr) < 0)
 565                 return -1;
 566
 567         /* treat SG_ERR here to get rid of sg_err.[ch] */
 568         io_hdr.status &= 0x7e;
 569         if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
 570             (0 == io_hdr.driver_status))
 571                 return 0;
 572         if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
 573             (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
 574             (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
 575                 if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
 576                         int sense_key;
 577                         unsigned char * sense_buffer = io_hdr.sbp;
 578                         if (sense_buffer[0] & 0x2)
 579                                 sense_key = sense_buffer[1] & 0xf;
 580                         else
 581                                 sense_key = sense_buffer[2] & 0xf;
 582                         if(RECOVERED_ERROR == sense_key)
 583                                 return 0;
 584                 }
 585         }
 586         return -1;
 587 }
 588
 589 static int
 590 get_serial (char * str, int maxlen, int fd)
 591 {
 592         int len = 0;
 593         char buff[MX_ALLOC_LEN + 1] = {0};
 594
 595         if (fd < 0)
 596                 return 1;
 597
 598         if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN)) {
 599                 len = buff[3];
 600                 if (len >= maxlen)
 601                         return 1;
 602                 if (len > 0) {
 603                         memcpy(str, buff + 4, len);
 604                         str[len] = '\0';
 605                 }
 606                 return 0;
 607         }
 608         return 1;
 609 }
 610
 611 static int
 612 get_geometry(struct path *pp)
 613 {
 614         if (pp->fd < 0)
 615                 return 1;
 616
 617         if (ioctl(pp->fd, HDIO_GETGEO, &pp->geom)) {
 618                 condlog(2, "%s: HDIO_GETGEO failed with %d", pp->dev, errno);
 619                 memset(&pp->geom, 0, sizeof(pp->geom));
 620                 return 1;
 621         }
 622         condlog(3, "%s: %u cyl, %u heads, %u sectors/track, start at %lu",
 623                 pp->dev, pp->geom.cylinders, pp->geom.heads,
 624                 pp->geom.sectors, pp->geom.start);
 625         return 0;
 626 }
 627
 628 static int
 629 scsi_sysfs_pathinfo (struct path * pp)
 630 {
 631         struct udev_device *parent;
 632         const char *attr_path = NULL;
 633
 634         parent = pp->udev;
 635         while (parent) {
 636                 const char *subsys = udev_device_get_subsystem(parent);
 637                 if (subsys && !strncmp(subsys, "scsi", 4)) {
 638                         attr_path = udev_device_get_sysname(parent);
 639                         if (!attr_path)
 640                                 break;
 641                         if (sscanf(attr_path, "%i:%i:%i:%i",
 642                                    &pp->sg_id.host_no,
 643                                    &pp->sg_id.channel,
 644                                    &pp->sg_id.scsi_id,
 645                                    &pp->sg_id.lun) == 4)
 646                                 break;
 647                 }
 648                 parent = udev_device_get_parent(parent);
 649         }
 650         if (!attr_path || pp->sg_id.host_no == -1)
 651                 return 1;
 652
 653         if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
 654                 return 1;
 655
 656         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 657
 658         if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
 659                 return 1;
 660
 661         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 662
 663         if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
 664                 return 1;
 665
 666         condlog(3, "%s: rev = %s", pp->dev, pp->rev);
 667
 668         /*
 669          * set the hwe configlet pointer
 670          */
 671         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, pp->rev);
 672
 673         /*
 674          * host / bus / target / lun
 675          */
 676         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 677                         pp->dev,
 678                         pp->sg_id.host_no,
 679                         pp->sg_id.channel,
 680                         pp->sg_id.scsi_id,
 681                         pp->sg_id.lun);
 682
 683         /*
 684          * target node name
 685          */
 686         if(!sysfs_get_tgt_nodename(pp, pp->tgt_node_name)) {
 687                 condlog(3, "%s: tgt_node_name = %s",
 688                         pp->dev, pp->tgt_node_name);
 689         }
 690
 691         return 0;
 692 }
 693
 694 static int
 695 ccw_sysfs_pathinfo (struct path * pp)
 696 {
 697         struct udev_device *parent;
 698         char attr_buff[NAME_SIZE];
 699         const char *attr_path;
 700
 701         parent = pp->udev;
 702         while (parent) {
 703                 const char *subsys = udev_device_get_subsystem(parent);
 704                 if (subsys && !strncmp(subsys, "ccw", 3))
 705                         break;
 706                 parent = udev_device_get_parent(parent);
 707         }
 708         if (!parent)
 709                 return 1;
 710
 711         sprintf(pp->vendor_id, "IBM");
 712
 713         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 714
 715         if (sysfs_get_devtype(parent, attr_buff, FILE_NAME_SIZE))
 716                 return 1;
 717
 718         if (!strncmp(attr_buff, "3370", 4)) {
 719                 sprintf(pp->product_id,"S/390 DASD FBA");
 720         } else if (!strncmp(attr_buff, "9336", 4)) {
 721                 sprintf(pp->product_id,"S/390 DASD FBA");
 722         } else {
 723                 sprintf(pp->product_id,"S/390 DASD ECKD");
 724         }
 725
 726         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 727
 728         /*
 729          * set the hwe configlet pointer
 730          */
 731         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, NULL);
 732
 733         /*
 734          * host / bus / target / lun
 735          */
 736         attr_path = udev_device_get_sysname(parent);
 737         pp->sg_id.lun = 0;
 738         sscanf(attr_path, "%i.%i.%x",
 739                         &pp->sg_id.host_no,
 740                         &pp->sg_id.channel,
 741                         &pp->sg_id.scsi_id);
 742         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 743                         pp->dev,
 744                         pp->sg_id.host_no,
 745                         pp->sg_id.channel,
 746                         pp->sg_id.scsi_id,
 747                         pp->sg_id.lun);
 748
 749         return 0;
 750 }
 751
 752 static int
 753 cciss_sysfs_pathinfo (struct path * pp)
 754 {
 755         const char * attr_path = NULL;
 756         struct udev_device *parent;
 757
 758         parent = pp->udev;
 759         while (parent) {
 760                 const char *subsys = udev_device_get_subsystem(parent);
 761                 if (subsys && !strncmp(subsys, "cciss", 5)) {
 762                         attr_path = udev_device_get_sysname(parent);
 763                         if (!attr_path)
 764                                 break;
 765                         if (sscanf(attr_path, "c%id%i",
 766                                    &pp->sg_id.host_no,
 767                                    &pp->sg_id.scsi_id) == 2)
 768                                 break;
 769                 }
 770                 parent = udev_device_get_parent(parent);
 771         }
 772         if (!attr_path || pp->sg_id.host_no == -1)
 773                 return 1;
 774
 775         if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
 776                 return 1;
 777
 778         condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
 779
 780         if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
 781                 return 1;
 782
 783         condlog(3, "%s: product = %s", pp->dev, pp->product_id);
 784
 785         if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
 786                 return 1;
 787
 788         condlog(3, "%s: rev = %s", pp->dev, pp->rev);
 789
 790         /*
 791          * set the hwe configlet pointer
 792          */
 793         pp->hwe = find_hwe(conf->hwtable, pp->vendor_id, pp->product_id, pp->rev);
 794
 795         /*
 796          * host / bus / target / lun
 797          */
 798         pp->sg_id.lun = 0;
 799         pp->sg_id.channel = 0;
 800         condlog(3, "%s: h:b:t:l = %i:%i:%i:%i",
 801                 pp->dev,
 802                 pp->sg_id.host_no,
 803                 pp->sg_id.channel,
 804                 pp->sg_id.scsi_id,
 805                 pp->sg_id.lun);
 806         return 0;
 807 }
 808
 809 static int
 810 common_sysfs_pathinfo (struct path * pp)
 811 {
 812         if (!pp)
 813                 return 1;
 814
 815         if (!pp->udev) {
 816                 condlog(4, "%s: udev not initialised", pp->dev);
 817                 return 1;
 818         }
 819         if (sysfs_get_dev(pp->udev, pp->dev_t, BLK_DEV_SIZE)) {
 820                 condlog(3, "%s: no 'dev' attribute in sysfs", pp->dev);
 821                 return 1;
 822         }
 823
 824         condlog(3, "%s: dev_t = %s", pp->dev, pp->dev_t);
 825
 826         if (sysfs_get_size(pp, &pp->size))
 827                 return 1;
 828
 829         condlog(3, "%s: size = %llu", pp->dev, pp->size);
 830
 831         return 0;
 832 }
 833
 834 int
 835 path_offline (struct path * pp)
 836 {
 837         struct udev_device * parent;
 838         char buff[SCSI_STATE_SIZE];
 839
 840         if (pp->bus != SYSFS_BUS_SCSI)
 841                 return PATH_UP;
 842
 843         parent = pp->udev;
 844         while (parent) {
 845                 const char *subsys = udev_device_get_subsystem(parent);
 846                 if (subsys && !strncmp(subsys, "scsi", 4))
 847                         break;
 848                 parent = udev_device_get_parent(parent);
 849         }
 850
 851         if (!parent) {
 852                 condlog(1, "%s: failed to get sysfs information", pp->dev);
 853                 return PATH_DOWN;
 854         }
 855
 856         memset(buff, 0x0, SCSI_STATE_SIZE);
 857         if (sysfs_attr_get_value(parent, "state", buff, SCSI_STATE_SIZE) <= 0)
 858                 return PATH_DOWN;
 859
 860         condlog(3, "%s: path state = %s", pp->dev, buff);
 861
 862         if (!strncmp(buff, "offline", 7) ||
 863             !strncmp(buff, "quiesce", 7) ||
 864             !strncmp(buff, "transport-offline", 17)) {
 865                 pp->offline = 1;
 866                 return PATH_DOWN;
 867         }
 868         pp->offline = 0;
 869         if (!strncmp(buff, "blocked", 7) || !strncmp(buff, "quiesce", 7))
 870                 return PATH_PENDING;
 871         else if (!strncmp(buff, "running", 7))
 872                 return PATH_UP;
 873
 874         return PATH_DOWN;
 875 }
 876
 877 int
 878 sysfs_pathinfo(struct path * pp)
 879 {
 880         if (common_sysfs_pathinfo(pp))
 881                 return 1;
 882
 883         pp->bus = SYSFS_BUS_UNDEF;
 884         if (!strncmp(pp->dev,"cciss",5))
 885                 pp->bus = SYSFS_BUS_CCISS;
 886         if (!strncmp(pp->dev,"dasd", 4))
 887                 pp->bus = SYSFS_BUS_CCW;
 888         if (!strncmp(pp->dev,"sd", 2))
 889                 pp->bus = SYSFS_BUS_SCSI;
 890
 891         if (pp->bus == SYSFS_BUS_UNDEF)
 892                 return 0;
 893         else if (pp->bus == SYSFS_BUS_SCSI) {
 894                 if (scsi_sysfs_pathinfo(pp))
 895                         return 1;
 896         } else if (pp->bus == SYSFS_BUS_CCW) {
 897                 if (ccw_sysfs_pathinfo(pp))
 898                         return 1;
 899         } else if (pp->bus == SYSFS_BUS_CCISS) {
 900                 if (cciss_sysfs_pathinfo(pp))
 901                         return 1;
 902         }
 903         return 0;
 904 }
 905
 906 static int
 907 scsi_ioctl_pathinfo (struct path * pp, int mask)
 908 {
 909         if (mask & DI_SERIAL) {
 910                 get_serial(pp->serial, SERIAL_SIZE, pp->fd);
 911                 condlog(3, "%s: serial = %s", pp->dev, pp->serial);
 912         }
 913
 914         return 0;
 915 }
 916
 917 static int
 918 cciss_ioctl_pathinfo (struct path * pp, int mask)
 919 {
 920         if (mask & DI_SERIAL) {
 921                 get_serial(pp->serial, SERIAL_SIZE, pp->fd);
 922                 condlog(3, "%s: serial = %s", pp->dev, pp->serial);
 923         }
 924         return 0;
 925 }
 926
 927 int
 928 get_state (struct path * pp, int daemon)
 929 {
 930         struct checker * c = &pp->checker;
 931         int state;
 932
 933         condlog(3, "%s: get_state", pp->dev);
 934
 935         if (!checker_selected(c)) {
 936                 if (daemon) {
 937                         if (pathinfo(pp, conf->hwtable, DI_SYSFS) != 0) {
 938                                 condlog(3, "%s: couldn't get sysfs pathinfo",
 939                                         pp->dev);
 940                                 return PATH_UNCHECKED;
 941                         }
 942                 }
 943                 select_checker(pp);
 944                 if (!checker_selected(c)) {
 945                         condlog(3, "%s: No checker selected", pp->dev);
 946                         return PATH_UNCHECKED;
 947                 }
 948                 checker_set_fd(c, pp->fd);
 949                 if (checker_init(c, pp->mpp?&pp->mpp->mpcontext:NULL)) {
 950                         memset(c, 0x0, sizeof(struct checker));
 951                         condlog(3, "%s: checker init failed", pp->dev);
 952                         return PATH_UNCHECKED;
 953                 }
 954         }
 955         checker_clear_message(c);
 956         if (daemon)
 957                 checker_set_async(c);
 958         if (!conf->checker_timeout &&
 959             (pp->bus != SYSFS_BUS_SCSI ||
 960              sysfs_get_timeout(pp, &(c->timeout))))
 961                 c->timeout = DEF_TIMEOUT;
 962         state = checker_check(c);
 963         condlog(3, "%s: state = %s", pp->dev, checker_state_name(state));
 964         if (state != PATH_UP && state != PATH_GHOST &&
 965             strlen(checker_message(c)))
 966                 condlog(3, "%s: checker msg is \"%s\"",
 967                         pp->dev, checker_message(c));
 968         return state;
 969 }
 970
 971 static int
 972 get_prio (struct path * pp)
 973 {
 974         if (!pp)
 975                 return 0;
 976
 977         struct prio * p = &pp->prio;
 978
 979         if (!prio_selected(p)) {
 980                 select_detect_prio(pp);
 981                 select_prio(pp);
 982                 if (!prio_selected(p)) {
 983                         condlog(3, "%s: no prio selected", pp->dev);
 984                         pp->priority = PRIO_UNDEF;
 985                         return 1;
 986                 }
 987         }
 988         pp->priority = prio_getprio(p, pp);
 989         if (pp->priority < 0) {
 990                 condlog(3, "%s: %s prio error", pp->dev, prio_name(p));
 991                 pp->priority = PRIO_UNDEF;
 992                 return 1;
 993         }
 994         condlog(3, "%s: %s prio = %u",
 995                 pp->dev, prio_name(p), pp->priority);
 996         return 0;
 997 }
 998
 999 static int
1000 get_uid (struct path * pp)
1001 {
1002         char *c;
1003         const char *origin;
1004
1005         if (!pp->uid_attribute && !pp->getuid)
1006                 select_getuid(pp);
1007
1008         if (!pp->udev) {
1009                 condlog(1, "%s: no udev information", pp->dev);
1010                 return 1;
1011         }
1012
1013         memset(pp->wwid, 0, WWID_SIZE);
1014         if (pp->getuid) {
1015                 char buff[CALLOUT_MAX_SIZE];
1016
1017                 /* Use 'getuid' callout, deprecated */
1018                 condlog(1, "%s: using deprecated getuid callout", pp->dev);
1019                 if (apply_format(pp->getuid, &buff[0], pp)) {
1020                         condlog(0, "error formatting uid callout command");
1021                         memset(pp->wwid, 0, WWID_SIZE);
1022                 } else if (execute_program(buff, pp->wwid, WWID_SIZE)) {
1023                         condlog(3, "error calling out %s", buff);
1024                         memset(pp->wwid, 0, WWID_SIZE);
1025                 }
1026                 origin = "callout";
1027         } else {
1028                 const char *value;
1029
1030                 value = udev_device_get_property_value(pp->udev,
1031                                                        pp->uid_attribute);
1032                 if ((!value || strlen(value) == 0) && conf->dry_run == 2)
1033                         value = getenv(pp->uid_attribute);
1034                 if (value && strlen(value)) {
1035                         size_t len = WWID_SIZE;
1036
1037                         if (strlen(value) + 1 > WWID_SIZE) {
1038                                 condlog(0, "%s: wwid overflow", pp->dev);
1039                         } else {
1040                                 len = strlen(value);
1041                         }
1042                         strncpy(pp->wwid, value, len);
1043                 } else {
1044                         condlog(3, "%s: no %s attribute", pp->dev,
1045                                 pp->uid_attribute);
1046                 }
1047                 origin = "udev";
1048         }
1049         /* Strip any trailing blanks */
1050         c = strchr(pp->wwid, '\0');
1051         c--;
1052         while (c && c >= pp->wwid && *c == ' ') {
1053                 *c = '\0';
1054                 c--;
1055         }
1056         condlog(3, "%s: uid = %s (%s)", pp->dev,
1057                 *pp->wwid == '\0' ? "<empty>" : pp->wwid, origin);
1058         return 0;
1059 }
1060
1061 extern int
1062 pathinfo (struct path *pp, vector hwtable, int mask)
1063 {
1064         int path_state;
1065
1066         if (!pp)
1067                 return 1;
1068
1069         condlog(3, "%s: mask = 0x%x", pp->dev, mask);
1070
1071         /*
1072          * fetch info available in sysfs
1073          */
1074         if (mask & DI_SYSFS && sysfs_pathinfo(pp))
1075                 return 1;
1076
1077         if (mask & DI_BLACKLIST && mask & DI_SYSFS) {
1078                 if (filter_device(conf->blist_device, conf->elist_device,
1079                                   pp->vendor_id, pp->product_id) > 0) {
1080                         return 2;
1081                 }
1082         }
1083
1084         path_state = path_offline(pp);
1085
1086         /*
1087          * fetch info not available through sysfs
1088          */
1089         if (pp->fd < 0)
1090                 pp->fd = open(udev_device_get_devnode(pp->udev), O_RDONLY);
1091
1092         if (pp->fd < 0) {
1093                 condlog(4, "Couldn't open node for %s: %s",
1094                         pp->dev, strerror(errno));
1095                 goto blank;
1096         }
1097
1098         if (mask & DI_SERIAL)
1099                 get_geometry(pp);
1100
1101         if (path_state == PATH_UP && pp->bus == SYSFS_BUS_SCSI &&
1102             scsi_ioctl_pathinfo(pp, mask))
1103                 goto blank;
1104
1105         if (pp->bus == SYSFS_BUS_CCISS &&
1106             cciss_ioctl_pathinfo(pp, mask))
1107                 goto blank;
1108
1109         if (mask & DI_CHECKER) {
1110                 if (path_state == PATH_UP) {
1111                         pp->chkrstate = pp->state = get_state(pp, 0);
1112                         if (pp->state == PATH_UNCHECKED ||
1113                             pp->state == PATH_WILD)
1114                                 goto blank;
1115                         if (pp->state == PATH_TIMEOUT)
1116                                 pp->state = PATH_DOWN;
1117                 } else {
1118                         condlog(3, "%s: path inaccessible", pp->dev);
1119                         pp->chkrstate = pp->state = path_state;
1120                 }
1121         }
1122
1123         if ((mask & DI_WWID) && !strlen(pp->wwid))
1124                 get_uid(pp);
1125         if (mask & DI_BLACKLIST && mask & DI_WWID) {
1126                 if (filter_wwid(conf->blist_wwid, conf->elist_wwid,
1127                                 pp->wwid) > 0) {
1128                         return 2;
1129                 }
1130         }
1131
1132          /*
1133           * Retrieve path priority, even for PATH_DOWN paths if it has never
1134           * been successfully obtained before.
1135           */
1136         if ((mask & DI_PRIO) && path_state == PATH_UP) {
1137                 if (pp->state != PATH_DOWN || pp->priority == PRIO_UNDEF) {
1138                         if (!strlen(pp->wwid))
1139                                 get_uid(pp);
1140                         get_prio(pp);
1141                 } else {
1142                         pp->priority = PRIO_UNDEF;
1143                 }
1144         }
1145
1146         return 0;
1147
1148 blank:
1149         /*
1150          * Recoverable error, for example faulty or offline path
1151          */
1152         memset(pp->wwid, 0, WWID_SIZE);
1153         pp->chkrstate = pp->state = PATH_DOWN;
1154
1155         return 0;
1156 }