namedev.c

   1 /*
   2  * namedev.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #include <stddef.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <sys/wait.h>
  33 #include <sys/stat.h>
  34 #include <sys/sysinfo.h>
  35
  36 #include "libsysfs/sysfs/libsysfs.h"
  37 #include "list.h"
  38 #include "udev.h"
  39 #include "udev_lib.h"
  40 #include "udev_version.h"
  41 #include "logging.h"
  42 #include "namedev.h"
  43 #include "klibc_fixups.h"
  44 #include "udevdb.h"
  45
  46 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  47
  48 LIST_HEAD(config_device_list);
  49 LIST_HEAD(perm_device_list);
  50
  51
  52 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  53 static int strcmp_pattern(const char *p, const char *s)
  54 {
  55         if (s[0] == '\0') {
  56                 while (p[0] == '*')
  57                         p++;
  58                 return (p[0] != '\0');
  59         }
  60         switch (p[0]) {
  61         case '[':
  62                 {
  63                         int not = 0;
  64                         p++;
  65                         if (p[0] == '!') {
  66                                 not = 1;
  67                                 p++;
  68                         }
  69                         while ((p[0] != '\0') && (p[0] != ']')) {
  70                                 int match = 0;
  71                                 if (p[1] == '-') {
  72                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  73                                                 match = 1;
  74                                         p += 3;
  75                                 } else {
  76                                         match = (p[0] == s[0]);
  77                                         p++;
  78                                 }
  79                                 if (match ^ not) {
  80                                         while ((p[0] != '\0') && (p[0] != ']'))
  81                                                 p++;
  82                                         if (p[0] == ']')
  83                                                 return strcmp_pattern(p+1, s+1);
  84                                 }
  85                         }
  86                 }
  87                 break;
  88         case '*':
  89                 if (strcmp_pattern(p, s+1))
  90                         return strcmp_pattern(p+1, s);
  91                 return 0;
  92         case '\0':
  93                 if (s[0] == '\0') {
  94                         return 0;
  95                 }
  96                 break;
  97         default:
  98                 if ((p[0] == s[0]) || (p[0] == '?'))
  99                         return strcmp_pattern(p+1, s+1);
 100                 break;
 101         }
 102         return 1;
 103 }
 104
 105 static struct perm_device *find_perm(char *name)
 106 {
 107         struct perm_device *perm;
 108
 109         list_for_each_entry(perm, &perm_device_list, node) {
 110                 if (strcmp_pattern(perm->name, name))
 111                         continue;
 112                 return perm;
 113         }
 114         return NULL;
 115 }
 116
 117 static mode_t get_default_mode(void)
 118 {
 119         mode_t mode = 0600;     /* default to owner rw only */
 120
 121         if (strlen(default_mode_str) != 0)
 122                 mode = strtol(default_mode_str, NULL, 8);
 123
 124         return mode;
 125 }
 126
 127 static char *get_default_owner(void)
 128 {
 129         if (strlen(default_owner_str) == 0)
 130                 strfieldcpy(default_owner_str, "root");
 131
 132         return default_owner_str;
 133 }
 134
 135 static char *get_default_group(void)
 136 {
 137         if (strlen(default_group_str) == 0)
 138                 strfieldcpy(default_group_str, "root");
 139
 140         return default_group_str;
 141 }
 142
 143 /* extract possible {attr} and move str behind it */
 144 static char *get_format_attribute(char **str)
 145 {
 146         char *pos;
 147         char *attr = NULL;
 148
 149         if (*str[0] == '{') {
 150                 pos = strchr(*str, '}');
 151                 if (pos == NULL) {
 152                         dbg("missing closing brace for format");
 153                         return NULL;
 154                 }
 155                 pos[0] = '\0';
 156                 attr = *str+1;
 157                 *str = pos+1;
 158                 dbg("attribute='%s', str='%s'", attr, *str);
 159         }
 160         return attr;
 161 }
 162
 163 /* extract possible format length and move str behind it*/
 164 static int get_format_len(char **str)
 165 {
 166         int num;
 167         char *tail;
 168
 169         if (isdigit(*str[0])) {
 170                 num = (int) strtoul(*str, &tail, 10);
 171                 if (num > 0) {
 172                         *str = tail;
 173                         dbg("format length=%i", num);
 174                         return num;
 175                 } else {
 176                         dbg("format parsing error '%s'", *str);
 177                 }
 178         }
 179         return -1;
 180 }
 181
 182 /** Finds the lowest positive N such that <name>N isn't present in
 183  *  $(udevroot) either as a file or a symlink.
 184  *
 185  *  @param  name                Name to check for
 186  *  @return                     0 if <name> didn't exist and N otherwise.
 187  */
 188 static unsigned int find_free_number (struct udevice *udev, char *name)
 189 {
 190         char temp[NAME_SIZE];
 191         char path[NAME_SIZE];
 192         struct udevice dev;
 193         int result;
 194
 195         /* have to sweep the database for each lookup */
 196         result = 0;
 197         strncpy(temp, name, sizeof (temp));
 198         while (1) {
 199                 if (udevdb_get_dev_byname(temp, path, &dev) != 0)
 200                         goto found;
 201                 /* symlink might be stale if $(udevroot) isn't cleaned; check
 202                  * on major/minor to see if it's the same device
 203                  */
 204                 if (dev.major == udev->major && dev.minor == udev->minor)
 205                         goto found;
 206                 snprintf (temp, sizeof(temp), "%s%d", name, ++result);
 207         }
 208
 209 found:
 210         return result;
 211 }
 212
 213 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 214                          struct sysfs_class_device *class_dev,
 215                          struct sysfs_device *sysfs_device)
 216 {
 217         char temp[NAME_SIZE];
 218         char temp2[NAME_SIZE];
 219         char *tail;
 220         char *pos;
 221         char *attr;
 222         int len;
 223         int i;
 224         char c;
 225         char *spos;
 226         char *rest;
 227         int slen;
 228         struct sysfs_attribute *tmpattr;
 229         unsigned int next_free_number;
 230
 231         pos = string;
 232         while (1) {
 233                 pos = strchr(pos, '%');
 234                 if (pos == NULL)
 235                         break;
 236
 237                 pos[0] = '\0';
 238                 tail = pos+1;
 239                 len = get_format_len(&tail);
 240                 c = tail[0];
 241                 strfieldcpy(temp, tail+1);
 242                 tail = temp;
 243                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 244                 attr = get_format_attribute(&tail);
 245
 246
 247                 switch (c) {
 248                 case 'b':
 249                         if (strlen(udev->bus_id) == 0)
 250                                 break;
 251                         strfieldcatmax(string, udev->bus_id, maxsize);
 252                         dbg("substitute bus_id '%s'", udev->bus_id);
 253                         break;
 254                 case 'k':
 255                         if (strlen(udev->kernel_name) == 0)
 256                                 break;
 257                         strfieldcatmax(string, udev->kernel_name, maxsize);
 258                         dbg("substitute kernel name '%s'", udev->kernel_name);
 259                         break;
 260                 case 'n':
 261                         if (strlen(udev->kernel_number) == 0)
 262                                 break;
 263                         strfieldcatmax(string, udev->kernel_number, maxsize);
 264                         dbg("substitute kernel number '%s'", udev->kernel_number);
 265                                 break;
 266                 case 'm':
 267                         strintcatmax(string, udev->minor, maxsize);
 268                         dbg("substitute minor number '%u'", udev->minor);
 269                         break;
 270                 case 'M':
 271                         strintcatmax(string, udev->major, maxsize);
 272                         dbg("substitute major number '%u'", udev->major);
 273                         break;
 274                 case 'c':
 275                         if (strlen(udev->program_result) == 0)
 276                                 break;
 277                         /* get part part of the result string */
 278                         i = 0;
 279                         if (attr != NULL)
 280                                 i = strtoul(attr, &rest, 10);
 281                         if (i > 0) {
 282                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 283                                         i--;
 284                                         if (i == 0)
 285                                                 break;
 286                                 }
 287                                 if (i > 0) {
 288                                         dbg("requested part of result string not found");
 289                                         break;
 290                                 }
 291                                 if (rest[0] == '+')
 292                                         strfieldcpy(temp2, spos);
 293                                 else
 294                                         strfieldcpymax(temp2, spos, slen+1);
 295                                 strfieldcatmax(string, temp2, maxsize);
 296                                 dbg("substitute part of result string '%s'", temp2);
 297                         } else {
 298                                 strfieldcatmax(string, udev->program_result, maxsize);
 299                                 dbg("substitute result string '%s'", udev->program_result);
 300                         }
 301                         break;
 302                 case 's':
 303                         if (attr != NULL) {
 304                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 305                                 if (tmpattr == NULL) {
 306                                         dbg("sysfa attribute '%s' not found", attr);
 307                                         break;
 308                                 }
 309                                 /* strip trailing whitespace of matching value */
 310                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 311                                         i = len = strlen(tmpattr->value);
 312                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 313                                                 i--;
 314                                         if (i < len) {
 315                                                 tmpattr->value[i] = '\0';
 316                                                 dbg("remove %i trailing whitespace chars from '%s'",
 317                                                          len - i, tmpattr->value);
 318                                         }
 319                                 }
 320                                 strfieldcatmax(string, tmpattr->value, maxsize);
 321                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 322                         } else {
 323                                 dbg("missing attribute");
 324                         }
 325                         break;
 326                 case '%':
 327                         strfieldcatmax(string, "%", maxsize);
 328                         pos++;
 329                         break;
 330                 case 'e':
 331                         next_free_number = find_free_number(udev, string);
 332                         if (next_free_number > 0) {
 333                                 snprintf(temp2, sizeof(temp2), "%d", next_free_number);
 334                                 strfieldcatmax(string, temp2, maxsize);
 335                         }
 336                         break;
 337                 default:
 338                         dbg("unknown substitution type '%%%c'", c);
 339                         break;
 340                 }
 341                 /* truncate to specified length */
 342                 if (len > 0)
 343                         pos[len] = '\0';
 344
 345                 strfieldcatmax(string, tail, maxsize);
 346         }
 347 }
 348
 349 /*
 350  * Note, we can have multiple files for different busses in here due
 351  * to the mess that USB has for its device tree...
 352  */
 353 static struct bus_file {
 354         char *bus;
 355         char *file;
 356 } bus_files[] = {
 357         { .bus = "scsi",        .file = "vendor" },
 358         { .bus = "usb",         .file = "idVendor" },
 359         { .bus = "usb",         .file = "iInterface" },
 360         { .bus = "usb-serial",  .file = "detach_state" },
 361         { .bus = "ide",         .file = "detach_state" },
 362         { .bus = "pci",         .file = "vendor" },
 363         {}
 364 };
 365
 366 static void wait_for_device_to_initialize(struct sysfs_device *sysfs_device)
 367 {
 368         /* sleep until we see the file for this specific bus type show up this
 369          * is needed because we can easily out-run the kernel in looking for
 370          * these files before the paticular subsystem has created them in the
 371          * sysfs tree properly.
 372          *
 373          * And people thought that the /sbin/hotplug event system was going to
 374          * be slow, poo on you for arguing that before even testing it...
 375          */
 376         struct bus_file *b = &bus_files[0];
 377         struct sysfs_attribute *tmpattr;
 378         int found = 0;
 379         int loop = WAIT_FOR_FILE_SECONDS * WAIT_FOR_FILE_RETRY_FREQ;
 380
 381         while (1) {
 382                 if (b->bus == NULL) {
 383                         if (!found)
 384                                 break;
 385                         /* give the kernel a chance to create the file */
 386                         usleep(1000 * 1000 / WAIT_FOR_FILE_RETRY_FREQ);
 387                         --loop;
 388                         if (loop == 0)
 389                                 break;
 390                         b = &bus_files[0];
 391                 }
 392                 if (strcmp(sysfs_device->bus, b->bus) == 0) {
 393                         found = 1;
 394                         dbg("looking for file '%s' on bus '%s'", b->file, b->bus);
 395                         tmpattr = sysfs_get_device_attr(sysfs_device, b->file);
 396                         if (tmpattr) {
 397                                 /* found it! */
 398                                 goto exit;
 399                         }
 400                         dbg("can't find '%s' file", b->file);
 401                 }
 402                 ++b;
 403         }
 404         if (!found)
 405                 dbg("did not find bus type '%s' on list of bus_id_files, "
 406                     "please report to <linux-hotplug-devel@lists.sourceforge.net>",
 407                     sysfs_device->bus);
 408 exit:
 409         return; /* here to prevent compiler warning... */
 410 }
 411
 412 static void fix_kernel_name(struct udevice *udev)
 413 {
 414         char *temp = udev->kernel_name;
 415
 416         while (*temp != 0x00) {
 417                 /* Some block devices have a ! in their name,
 418                  * we need to change that to / */
 419                 if (*temp == '!')
 420                         *temp = '/';
 421                 ++temp;
 422         }
 423 }
 424
 425 static int execute_program(const char *path, char *value, int len)
 426 {
 427         int retval;
 428         int count;
 429         int status;
 430         int fds[2];
 431         pid_t pid;
 432         char *pos;
 433         char arg[PROGRAM_SIZE];
 434         char *argv[(PROGRAM_SIZE / 2) + 1];
 435         int i;
 436
 437         strfieldcpy(arg, path);
 438         i = 0;
 439         if (strchr(path, ' ')) {
 440                 pos = arg;
 441                 while (pos != NULL) {
 442                         if (pos[0] == '\'') {
 443                                 /* don't separate if in apostrophes */
 444                                 pos++;
 445                                 argv[i] = strsep(&pos, "\'");
 446                                 while (pos && pos[0] == ' ')
 447                                         pos++;
 448                         } else {
 449                                 argv[i] = strsep(&pos, " ");
 450                         }
 451                         dbg("arg[%i] '%s'", i, argv[i]);
 452                         i++;
 453                 }
 454                 argv[i] =  NULL;
 455                 dbg("execute '%s' with parsed arguments", arg);
 456         } else {
 457                 argv[0] = arg;
 458                 argv[1] = main_argv[1];
 459                 argv[2] = NULL;
 460                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 461         }
 462
 463         retval = pipe(fds);
 464         if (retval != 0) {
 465                 dbg("pipe failed");
 466                 return -1;
 467         }
 468
 469         pid = fork();
 470         switch(pid) {
 471         case 0:
 472                 /* child */
 473                 /* dup2 write side of pipe to STDOUT */
 474                 dup2(fds[1], STDOUT_FILENO);
 475                 retval = execv(arg, argv);
 476
 477                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 478                 exit(1);
 479         case -1:
 480                 dbg("fork failed");
 481                 return -1;
 482         default:
 483                 /* parent reads from fds[0] */
 484                 close(fds[1]);
 485                 retval = 0;
 486                 i = 0;
 487                 while (1) {
 488                         count = read(fds[0], value + i, len - i-1);
 489                         if (count <= 0)
 490                                 break;
 491
 492                         i += count;
 493                         if (i >= len-1) {
 494                                 dbg("result len %d too short", len);
 495                                 retval = -1;
 496                                 break;
 497                         }
 498                 }
 499
 500                 if (count < 0) {
 501                         dbg("read failed with '%s'", strerror(errno));
 502                         retval = -1;
 503                 }
 504
 505                 if (i > 0 && value[i-1] == '\n')
 506                         i--;
 507                 value[i] = '\0';
 508                 dbg("result is '%s'", value);
 509
 510                 close(fds[0]);
 511                 wait(&status);
 512
 513                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 514                         dbg("exec program status 0x%x", status);
 515                         retval = -1;
 516                 }
 517         }
 518         return retval;
 519 }
 520
 521 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 522 {
 523         struct sysfs_attribute *tmpattr = NULL;
 524         char *c;
 525
 526         dbg("look for device attribute '%s'", attr);
 527         /* try to find the attribute in the class device directory */
 528         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 529         if (tmpattr)
 530                 goto attr_found;
 531
 532         /* look in the class device directory if present */
 533         if (sysfs_device) {
 534                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 535                 if (tmpattr)
 536                         goto attr_found;
 537         }
 538
 539         return NULL;
 540
 541 attr_found:
 542         c = strchr(tmpattr->value, '\n');
 543         if (c != NULL)
 544                 c[0] = '\0';
 545
 546         dbg("found attribute '%s'", tmpattr->path);
 547         return tmpattr;
 548 }
 549
 550 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 551 {
 552         struct sysfs_attribute *tmpattr;
 553         int i;
 554         int len;
 555
 556         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 557                 return -ENODEV;
 558
 559         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 560         if (tmpattr == NULL)
 561                 return -ENODEV;
 562
 563         /* strip trailing whitespace of value, if not asked to match for it */
 564         if (! isspace(pair->value[strlen(pair->value)-1])) {
 565                 i = len = strlen(tmpattr->value);
 566                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 567                         i--;
 568                 if (i < len) {
 569                         tmpattr->value[i] = '\0';
 570                         dbg("remove %i trailing whitespace chars from '%s'",
 571                             len - i, tmpattr->value);
 572                 }
 573         }
 574
 575         dbg("compare attribute '%s' value '%s' with '%s'",
 576                   pair->file, tmpattr->value, pair->value);
 577         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 578                 return -ENODEV;
 579
 580         dbg("found matching attribute '%s' with value '%s'",
 581             pair->file, pair->value);
 582         return 0;
 583 }
 584
 585 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 586 {
 587         struct sysfs_pair *pair;
 588         int i;
 589
 590         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 591                 pair = &dev->sysfs_pair[i];
 592                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 593                         break;
 594                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 595                         dbg("sysfs attribute doesn't match");
 596                         return -ENODEV;
 597                 }
 598         }
 599
 600         return 0;
 601 }
 602
 603 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 604 {
 605         char path[SYSFS_PATH_MAX];
 606         char *temp = NULL;
 607
 608         /* we have to have a sysfs device for ID to work */
 609         if (!sysfs_device)
 610                 return -ENODEV;
 611
 612         strfieldcpy(path, sysfs_device->path);
 613         temp = strrchr(path, '/');
 614         temp++;
 615         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 616         if (strcmp_pattern(dev->id, temp) != 0)
 617                 return -ENODEV;
 618         else
 619                 return 0;
 620 }
 621
 622 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 623 {
 624         char path[SYSFS_PATH_MAX];
 625         int found;
 626         char *temp = NULL;
 627
 628         /* we have to have a sysfs device for PLACE to work */
 629         if (!sysfs_device)
 630                 return -ENODEV;
 631
 632         found = 0;
 633         strfieldcpy(path, sysfs_device->path);
 634         temp = strrchr(path, '/');
 635         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 636         if (strstr(temp, dev->place) != NULL) {
 637                 found = 1;
 638         } else {
 639                 *temp = 0x00;
 640                 temp = strrchr(path, '/');
 641                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 642                 if (strstr(temp, dev->place) != NULL)
 643                         found = 1;
 644         }
 645         if (!found) {
 646                 dbg("place doesn't match");
 647                 return -ENODEV;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int whitelist_search(struct sysfs_class_device *class_dev)
 654 {
 655         char *sysblock = "/sys/block";
 656         int i;
 657
 658         static char *list[] = {
 659                 "nb",
 660                 "ram",
 661                 "loop",
 662                 "fd",
 663                 "md",
 664                 "dos_cd",
 665                 "double",
 666                 "flash",
 667                 "msd",
 668                 "rflash",
 669                 "rom",
 670                 "rrom",
 671                 "sbpcd",
 672                 "pcd",
 673                 "pf",
 674                 "scd",
 675                 "ubd",
 676                 NULL,
 677         };
 678
 679         if (strncmp(class_dev->path, sysblock, strlen(sysblock)))
 680                 return 0;
 681
 682         for (i=0; list[i] != NULL; i++)
 683                 if (!strncmp(class_dev->name, list[i], strlen(list[i])))
 684                         return 1;
 685
 686         return 0;
 687 }
 688
 689 static struct sysfs_device *get_sysfs_device(struct sysfs_class_device *class_dev)
 690 {
 691         struct sysfs_device *sysfs_device;
 692         struct sysfs_class_device *class_dev_parent;
 693         int loop;
 694
 695         /* Figure out where the device symlink is at.  For char devices this will
 696          * always be in the class_dev->path.  But for block devices, it's different.
 697          * The main block device will have the device symlink in it's path, but
 698          * all partitions have the symlink in its parent directory.
 699          * But we need to watch out for block devices that do not have parents, yet
 700          * look like a partition (fd0, loop0, etc.)  They all do not have a device
 701          * symlink yet.  We do sit and spin on waiting for them right now unless
 702          * they happen to be in the whitelist in which case we exit.
 703          */
 704         class_dev_parent = sysfs_get_classdev_parent(class_dev);
 705         if (class_dev_parent != NULL)
 706                 dbg("given class device has a parent, use this instead");
 707
 708         loop = WAIT_FOR_FILE_SECONDS * WAIT_FOR_FILE_RETRY_FREQ;
 709         while (loop--) {
 710                 if (udev_sleep) {
 711                         if (whitelist_search(class_dev)) {
 712                                 sysfs_device = NULL;
 713                                 goto exit;
 714                         }
 715                         usleep(1000 * 1000 / WAIT_FOR_FILE_RETRY_FREQ);
 716                 }
 717
 718                 if (class_dev_parent)
 719                         sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 720                 else
 721                         sysfs_device = sysfs_get_classdev_device(class_dev);
 722                 if (sysfs_device != NULL)
 723                         goto device_found;
 724         }
 725         dbg("timed out waiting for device symlink, continuing on anyway...");
 726
 727 device_found:
 728         /* We have another issue with just the wait above - the sysfs part of
 729          * the kernel may not be quick enough to have created the link to the
 730          * device under the "bus" subsystem. Due to this, the sysfs_device->bus
 731          * will not contain the actual bus name :(
 732          */
 733         if (sysfs_device) {
 734                 if (sysfs_device->bus[0] != '\0')
 735                         goto bus_found;
 736
 737                 while (loop--) {
 738                         if (udev_sleep)
 739                                 usleep(1000 * 1000 / WAIT_FOR_FILE_RETRY_FREQ);
 740                         sysfs_get_device_bus(sysfs_device);
 741
 742                         if (sysfs_device->bus[0] != '\0')
 743                                 goto bus_found;
 744                 }
 745                 dbg("timed out waiting to find the device bus, continuing on anyway");
 746                 goto exit;
 747 bus_found:
 748                 dbg("device %s is registered with bus '%s'",
 749                                 sysfs_device->name, sysfs_device->bus);
 750         }
 751 exit:
 752         return sysfs_device;
 753 }
 754
 755 static int match_rule(struct config_device *dev, struct sysfs_class_device *class_dev, struct udevice *udev, struct sysfs_device *sysfs_device)
 756 {
 757         while (1) {
 758                 /* check for matching bus value */
 759                 if (dev->bus[0] != '\0') {
 760                         if (sysfs_device == NULL) {
 761                                 dbg("device has no bus");
 762                                 goto try_parent;
 763                         }
 764                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'", dev->bus, sysfs_device->bus);
 765                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 766                                 dbg(FIELD_BUS " is not matching");
 767                                 goto try_parent;
 768                         } else {
 769                                 dbg(FIELD_BUS " matches");
 770                         }
 771                 }
 772
 773                 /* check for matching kernel name*/
 774                 if (dev->kernel[0] != '\0') {
 775                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'", dev->kernel, class_dev->name);
 776                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 777                                 dbg(FIELD_KERNEL " is not matching");
 778                                 goto try_parent;
 779                         } else {
 780                                 dbg(FIELD_KERNEL " matches");
 781                         }
 782                 }
 783
 784                 /* check for matching bus id */
 785                 if (dev->id[0] != '\0') {
 786                         dbg("check " FIELD_ID);
 787                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 788                                 dbg(FIELD_ID " is not matching");
 789                                 goto try_parent;
 790                         } else {
 791                                 dbg(FIELD_ID " matches");
 792                         }
 793                 }
 794
 795                 /* check for matching place of device */
 796                 if (dev->place[0] != '\0') {
 797                         dbg("check " FIELD_PLACE);
 798                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 799                                 dbg(FIELD_PLACE " is not matching");
 800                                 goto try_parent;
 801                         } else {
 802                                 dbg(FIELD_PLACE " matches");
 803                         }
 804                 }
 805
 806                 /* check for matching sysfs pairs */
 807                 if (dev->sysfs_pair[0].file[0] != '\0') {
 808                         dbg("check " FIELD_SYSFS " pairs");
 809                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 810                                 dbg(FIELD_SYSFS " is not matching");
 811                                 goto try_parent;
 812                         } else {
 813                                 dbg(FIELD_SYSFS " matches");
 814                         }
 815                 }
 816
 817                 /* execute external program */
 818                 if (dev->program[0] != '\0') {
 819                         char program[PROGRAM_SIZE];
 820
 821                         dbg("check " FIELD_PROGRAM);
 822                         strfieldcpy(program, dev->program);
 823                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 824                         if (execute_program(program, udev->program_result, NAME_SIZE) != 0) {
 825                                 dbg(FIELD_PROGRAM " returned nonzero");
 826                                 goto try_parent;
 827                         } else {
 828                                 dbg(FIELD_PROGRAM " returned successful");
 829                         }
 830                 }
 831
 832                 /* check for matching result of external program */
 833                 if (dev->result[0] != '\0') {
 834                         dbg("check for " FIELD_RESULT
 835                             " dev->result='%s', udev->program_result='%s'",
 836                             dev->result, udev->program_result);
 837                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 838                                 dbg(FIELD_RESULT " is not matching");
 839                                 goto try_parent;
 840                         } else {
 841                                 dbg(FIELD_RESULT " matches");
 842                         }
 843                 }
 844
 845                 /* Yeah, we matched! */
 846                 return 0;
 847
 848 try_parent:
 849                 dbg("try parent sysfs device");
 850                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 851                 if (sysfs_device == NULL)
 852                         return -ENODEV;
 853                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 854                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 855                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 856         }
 857
 858 }
 859
 860 int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *udev)
 861 {
 862         struct sysfs_device *sysfs_device = NULL;
 863         struct config_device *dev;
 864         struct perm_device *perm;
 865         struct sysinfo info;
 866         char *pos;
 867
 868         udev->mode = 0;
 869
 870         /* find the sysfs_device associated with this class device */
 871         sysfs_device = get_sysfs_device(class_dev);
 872         if (sysfs_device) {
 873                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 874                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 875                 dbg("sysfs_device->bus='%s'", sysfs_device->bus);
 876                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 877                 wait_for_device_to_initialize(sysfs_device);
 878         }
 879         dbg("class_dev->name = '%s'", class_dev->name);
 880
 881         strfieldcpy(udev->kernel_name, class_dev->name);
 882         fix_kernel_name(udev);
 883         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 884
 885         /* get kernel number */
 886         pos = class_dev->name + strlen(class_dev->name);
 887         while (isdigit(*(pos-1)))
 888                 pos--;
 889         strfieldcpy(udev->kernel_number, pos);
 890         dbg("kernel_number='%s'", udev->kernel_number);
 891
 892         /* look for a matching rule to apply */
 893         list_for_each_entry(dev, &config_device_list, node) {
 894                 dbg("process rule");
 895                 if (match_rule(dev, class_dev, udev, sysfs_device) == 0) {
 896                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0') {
 897                                 info("configured rule in '%s' at line %i applied, '%s' is ignored",
 898                                      dev->config_file, dev->config_line, udev->kernel_name);
 899                                 return -1;
 900                         }
 901
 902                         if (dev->symlink[0] != '\0') {
 903                                 char temp[NAME_SIZE];
 904
 905                                 info("configured rule in '%s' at line %i applied, added symlink '%s'",
 906                                      dev->config_file, dev->config_line, dev->symlink);
 907                                 strfieldcpy(temp, dev->symlink);
 908                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 909                                 if (udev->symlink[0] != '\0')
 910                                         strfieldcat(udev->symlink, " ");
 911                                 strfieldcat(udev->symlink, temp);
 912                         }
 913
 914                         if (dev->name[0] != '\0') {
 915                                 /* apply all_partitions flag only at a main block device */
 916                                 if (dev->partitions > 0 &&
 917                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 918                                         continue;
 919
 920                                 info("configured rule in '%s' at line %i applied, '%s' becomes '%s'",
 921                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 922                                 strfieldcpy(udev->name, dev->name);
 923                                 goto found;
 924                         }
 925                 }
 926         }
 927         /* no rule was found so we use the kernel name */
 928         strfieldcpy(udev->name, udev->kernel_name);
 929         if (udev->type == 'n')
 930                 goto done;
 931         else
 932                 goto perms;
 933
 934 found:
 935         apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 936         strfieldcpy(udev->config_file, dev->config_file);
 937         udev->config_line = dev->config_line;
 938
 939         if (udev->type == 'n')
 940                 goto done;
 941
 942         udev->partitions = dev->partitions;
 943
 944         /* get permissions given in rule */
 945         set_empty_perms(udev, dev->mode,
 946                               dev->owner,
 947                               dev->group);
 948
 949 perms:
 950         /* get permissions given in config file or set defaults */
 951         perm = find_perm(udev->name);
 952         if (perm != NULL) {
 953                 set_empty_perms(udev, perm->mode,
 954                                       perm->owner,
 955                                       perm->group);
 956         } else {
 957                 set_empty_perms(udev, get_default_mode(),
 958                                       get_default_owner(),
 959                                       get_default_group());
 960         }
 961
 962         dbg("name, '%s' is going to have owner='%s', group='%s', mode = %#o",
 963             udev->name, udev->owner, udev->group, udev->mode);
 964
 965 done:
 966         /* store time of action */
 967         sysinfo(&info);
 968         udev->config_uptime = info.uptime;
 969
 970         return 0;
 971 }
 972
 973 int namedev_init(void)
 974 {
 975         int retval;
 976
 977         retval = namedev_init_rules();
 978         if (retval)
 979                 return retval;
 980
 981         retval = namedev_init_permissions();
 982         if (retval)
 983                 return retval;
 984
 985         dump_config_dev_list();
 986         dump_perm_dev_list();
 987         return retval;
 988 }