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
  35 #include "libsysfs/sysfs/libsysfs.h"
  36 #include "list.h"
  37 #include "udev.h"
  38 #include "udev_utils.h"
  39 #include "udev_version.h"
  40 #include "logging.h"
  41 #include "namedev.h"
  42 #include "udev_db.h"
  43
  44 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr);
  45
  46 /* compare string with pattern (supports * ? [0-9] [!A-Z]) */
  47 static int strcmp_pattern(const char *p, const char *s)
  48 {
  49         if (s[0] == '\0') {
  50                 while (p[0] == '*')
  51                         p++;
  52                 return (p[0] != '\0');
  53         }
  54         switch (p[0]) {
  55         case '[':
  56                 {
  57                         int not = 0;
  58                         p++;
  59                         if (p[0] == '!') {
  60                                 not = 1;
  61                                 p++;
  62                         }
  63                         while ((p[0] != '\0') && (p[0] != ']')) {
  64                                 int match = 0;
  65                                 if (p[1] == '-') {
  66                                         if ((s[0] >= p[0]) && (s[0] <= p[2]))
  67                                                 match = 1;
  68                                         p += 3;
  69                                 } else {
  70                                         match = (p[0] == s[0]);
  71                                         p++;
  72                                 }
  73                                 if (match ^ not) {
  74                                         while ((p[0] != '\0') && (p[0] != ']'))
  75                                                 p++;
  76                                         if (p[0] == ']')
  77                                                 return strcmp_pattern(p+1, s+1);
  78                                 }
  79                         }
  80                 }
  81                 break;
  82         case '*':
  83                 if (strcmp_pattern(p, s+1))
  84                         return strcmp_pattern(p+1, s);
  85                 return 0;
  86         case '\0':
  87                 if (s[0] == '\0') {
  88                         return 0;
  89                 }
  90                 break;
  91         default:
  92                 if ((p[0] == s[0]) || (p[0] == '?'))
  93                         return strcmp_pattern(p+1, s+1);
  94                 break;
  95         }
  96         return 1;
  97 }
  98
  99 /* extract possible {attr} and move str behind it */
 100 static char *get_format_attribute(char **str)
 101 {
 102         char *pos;
 103         char *attr = NULL;
 104
 105         if (*str[0] == '{') {
 106                 pos = strchr(*str, '}');
 107                 if (pos == NULL) {
 108                         dbg("missing closing brace for format");
 109                         return NULL;
 110                 }
 111                 pos[0] = '\0';
 112                 attr = *str+1;
 113                 *str = pos+1;
 114                 dbg("attribute='%s', str='%s'", attr, *str);
 115         }
 116         return attr;
 117 }
 118
 119 /* extract possible format length and move str behind it*/
 120 static int get_format_len(char **str)
 121 {
 122         int num;
 123         char *tail;
 124
 125         if (isdigit(*str[0])) {
 126                 num = (int) strtoul(*str, &tail, 10);
 127                 if (num > 0) {
 128                         *str = tail;
 129                         dbg("format length=%i", num);
 130                         return num;
 131                 } else {
 132                         dbg("format parsing error '%s'", *str);
 133                 }
 134         }
 135         return -1;
 136 }
 137
 138 /** Finds the lowest positive N such that <name>N isn't present in
 139  *  $(udevroot) either as a file or a symlink.
 140  *
 141  *  @param  name                Name to check for
 142  *  @return                     0 if <name> didn't exist and N otherwise.
 143  */
 144 static int find_free_number(struct udevice *udev, const char *name)
 145 {
 146         char filename[NAME_SIZE];
 147         int num = 0;
 148         struct udevice db_udev;
 149
 150         strfieldcpy(filename, name);
 151         while (1) {
 152                 dbg("look for existing node '%s'", filename);
 153                 memset(&db_udev, 0x00, sizeof(struct udevice));
 154                 if (udev_db_get_device_byname(&db_udev, filename) != 0) {
 155                         dbg("free num=%d", num);
 156                         return num;
 157                 }
 158
 159                 num++;
 160                 if (num > 1000) {
 161                         info("find_free_number gone crazy (num=%d), aborted", num);
 162                         return -1;
 163                 }
 164                 snprintf(filename, NAME_SIZE, "%s%d", name, num);
 165                 filename[NAME_SIZE-1] = '\0';
 166         }
 167 }
 168
 169 static void apply_format(struct udevice *udev, char *string, size_t maxsize,
 170                          struct sysfs_class_device *class_dev,
 171                          struct sysfs_device *sysfs_device)
 172 {
 173         char temp[NAME_SIZE];
 174         char temp2[NAME_SIZE];
 175         char *tail;
 176         char *pos;
 177         char *attr;
 178         int len;
 179         int i;
 180         char c;
 181         char *spos;
 182         char *rest;
 183         int slen;
 184         struct sysfs_attribute *tmpattr;
 185         unsigned int next_free_number;
 186
 187         pos = string;
 188         while (1) {
 189                 pos = strchr(pos, '%');
 190                 if (pos == NULL)
 191                         break;
 192
 193                 pos[0] = '\0';
 194                 tail = pos+1;
 195                 len = get_format_len(&tail);
 196                 c = tail[0];
 197                 strfieldcpy(temp, tail+1);
 198                 tail = temp;
 199                 dbg("format=%c, string='%s', tail='%s'",c , string, tail);
 200                 attr = get_format_attribute(&tail);
 201
 202
 203                 switch (c) {
 204                 case 'p':
 205                         if (strlen(udev->devpath) == 0)
 206                                 break;
 207                         strfieldcatmax(string, udev->devpath, maxsize);
 208                         dbg("substitute kernel name '%s'", udev->kernel_name);
 209                         break;
 210                 case 'b':
 211                         if (strlen(udev->bus_id) == 0)
 212                                 break;
 213                         strfieldcatmax(string, udev->bus_id, maxsize);
 214                         dbg("substitute bus_id '%s'", udev->bus_id);
 215                         break;
 216                 case 'k':
 217                         if (strlen(udev->kernel_name) == 0)
 218                                 break;
 219                         strfieldcatmax(string, udev->kernel_name, maxsize);
 220                         dbg("substitute kernel name '%s'", udev->kernel_name);
 221                         break;
 222                 case 'n':
 223                         if (strlen(udev->kernel_number) == 0)
 224                                 break;
 225                         strfieldcatmax(string, udev->kernel_number, maxsize);
 226                         dbg("substitute kernel number '%s'", udev->kernel_number);
 227                                 break;
 228                 case 'm':
 229                         strintcatmax(string, udev->minor, maxsize);
 230                         dbg("substitute minor number '%u'", udev->minor);
 231                         break;
 232                 case 'M':
 233                         strintcatmax(string, udev->major, maxsize);
 234                         dbg("substitute major number '%u'", udev->major);
 235                         break;
 236                 case 'c':
 237                         if (strlen(udev->program_result) == 0)
 238                                 break;
 239                         /* get part part of the result string */
 240                         i = 0;
 241                         if (attr != NULL)
 242                                 i = strtoul(attr, &rest, 10);
 243                         if (i > 0) {
 244                                 foreach_strpart(udev->program_result, " \n\r", spos, slen) {
 245                                         i--;
 246                                         if (i == 0)
 247                                                 break;
 248                                 }
 249                                 if (i > 0) {
 250                                         dbg("requested part of result string not found");
 251                                         break;
 252                                 }
 253                                 if (rest[0] == '+')
 254                                         strfieldcpy(temp2, spos);
 255                                 else
 256                                         strfieldcpymax(temp2, spos, slen+1);
 257                                 strfieldcatmax(string, temp2, maxsize);
 258                                 dbg("substitute part of result string '%s'", temp2);
 259                         } else {
 260                                 strfieldcatmax(string, udev->program_result, maxsize);
 261                                 dbg("substitute result string '%s'", udev->program_result);
 262                         }
 263                         break;
 264                 case 's':
 265                         if (attr != NULL) {
 266                                 tmpattr = find_sysfs_attribute(class_dev, sysfs_device, attr);
 267                                 if (tmpattr == NULL) {
 268                                         dbg("sysfa attribute '%s' not found", attr);
 269                                         break;
 270                                 }
 271                                 /* strip trailing whitespace of matching value */
 272                                 if (isspace(tmpattr->value[strlen(tmpattr->value)-1])) {
 273                                         i = len = strlen(tmpattr->value);
 274                                         while (i > 0 &&  isspace(tmpattr->value[i-1]))
 275                                                 i--;
 276                                         if (i < len) {
 277                                                 tmpattr->value[i] = '\0';
 278                                                 dbg("remove %i trailing whitespace chars from '%s'",
 279                                                          len - i, tmpattr->value);
 280                                         }
 281                                 }
 282                                 strfieldcatmax(string, tmpattr->value, maxsize);
 283                                 dbg("substitute sysfs value '%s'", tmpattr->value);
 284                         } else {
 285                                 dbg("missing attribute");
 286                         }
 287                         break;
 288                 case '%':
 289                         strfieldcatmax(string, "%", maxsize);
 290                         pos++;
 291                         break;
 292                 case 'e':
 293                         next_free_number = find_free_number(udev, string);
 294                         if (next_free_number > 0) {
 295                                 sprintf(temp2, "%d", next_free_number);
 296                                 strfieldcatmax(string, temp2, maxsize);
 297                         }
 298                         break;
 299                 case 'N':
 300                         if (udev->tmp_node[0] == '\0') {
 301                                 dbg("create temporary device node for callout");
 302                                 snprintf(udev->tmp_node, NAME_SIZE-1, "%s/.tmp-%u-%u", udev_root, udev->major, udev->minor);
 303                                 udev_make_node(udev, udev->tmp_node, udev->major, udev->minor, 0600, 0, 0);
 304                         }
 305                         strfieldcatmax(string, udev->tmp_node, maxsize);
 306                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 307                         break;
 308                 default:
 309                         dbg("unknown substitution type '%%%c'", c);
 310                         break;
 311                 }
 312                 /* truncate to specified length */
 313                 if (len > 0)
 314                         pos[len] = '\0';
 315
 316                 strfieldcatmax(string, tail, maxsize);
 317         }
 318 }
 319
 320 static void fix_kernel_name(struct udevice *udev)
 321 {
 322         char *temp = udev->kernel_name;
 323
 324         while (*temp != 0x00) {
 325                 /* Some block devices have a ! in their name,
 326                  * we need to change that to / */
 327                 if (*temp == '!')
 328                         *temp = '/';
 329                 ++temp;
 330         }
 331 }
 332
 333 static int execute_program(struct udevice *udev, const char *path, char *value, int len)
 334 {
 335         int retval;
 336         int count;
 337         int status;
 338         int fds[2];
 339         pid_t pid;
 340         char *pos;
 341         char arg[PROGRAM_SIZE];
 342         char *argv[(PROGRAM_SIZE / 2) + 1];
 343         int i;
 344
 345         strfieldcpy(arg, path);
 346         i = 0;
 347         if (strchr(path, ' ')) {
 348                 pos = arg;
 349                 while (pos != NULL) {
 350                         if (pos[0] == '\'') {
 351                                 /* don't separate if in apostrophes */
 352                                 pos++;
 353                                 argv[i] = strsep(&pos, "\'");
 354                                 while (pos && pos[0] == ' ')
 355                                         pos++;
 356                         } else {
 357                                 argv[i] = strsep(&pos, " ");
 358                         }
 359                         dbg("arg[%i] '%s'", i, argv[i]);
 360                         i++;
 361                 }
 362                 argv[i] =  NULL;
 363                 dbg("execute '%s' with parsed arguments", arg);
 364         } else {
 365                 argv[0] = arg;
 366                 argv[1] = udev->subsystem;
 367                 argv[2] = NULL;
 368                 dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
 369         }
 370
 371         retval = pipe(fds);
 372         if (retval != 0) {
 373                 dbg("pipe failed");
 374                 return -1;
 375         }
 376
 377         pid = fork();
 378         switch(pid) {
 379         case 0:
 380                 /* child */
 381                 /* dup2 write side of pipe to STDOUT */
 382                 dup2(fds[1], STDOUT_FILENO);
 383                 retval = execv(arg, argv);
 384
 385                 info(FIELD_PROGRAM " execution of '%s' failed", path);
 386                 exit(1);
 387         case -1:
 388                 dbg("fork failed");
 389                 return -1;
 390         default:
 391                 /* parent reads from fds[0] */
 392                 close(fds[1]);
 393                 retval = 0;
 394                 i = 0;
 395                 while (1) {
 396                         count = read(fds[0], value + i, len - i-1);
 397                         if (count <= 0)
 398                                 break;
 399
 400                         i += count;
 401                         if (i >= len-1) {
 402                                 dbg("result len %d too short", len);
 403                                 retval = -1;
 404                                 break;
 405                         }
 406                 }
 407
 408                 if (count < 0) {
 409                         dbg("read failed with '%s'", strerror(errno));
 410                         retval = -1;
 411                 }
 412
 413                 if (i > 0 && value[i-1] == '\n')
 414                         i--;
 415                 value[i] = '\0';
 416                 dbg("result is '%s'", value);
 417
 418                 close(fds[0]);
 419                 waitpid(pid, &status, 0);
 420
 421                 if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
 422                         dbg("exec program status 0x%x", status);
 423                         retval = -1;
 424                 }
 425         }
 426         return retval;
 427 }
 428
 429 static struct sysfs_attribute *find_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, char *attr)
 430 {
 431         struct sysfs_attribute *tmpattr = NULL;
 432         char *c;
 433
 434         dbg("look for device attribute '%s'", attr);
 435         /* try to find the attribute in the class device directory */
 436         tmpattr = sysfs_get_classdev_attr(class_dev, attr);
 437         if (tmpattr)
 438                 goto attr_found;
 439
 440         /* look in the class device directory if present */
 441         if (sysfs_device) {
 442                 tmpattr = sysfs_get_device_attr(sysfs_device, attr);
 443                 if (tmpattr)
 444                         goto attr_found;
 445         }
 446
 447         return NULL;
 448
 449 attr_found:
 450         c = strchr(tmpattr->value, '\n');
 451         if (c != NULL)
 452                 c[0] = '\0';
 453
 454         dbg("found attribute '%s'", tmpattr->path);
 455         return tmpattr;
 456 }
 457
 458 static int compare_sysfs_attribute(struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device, struct sysfs_pair *pair)
 459 {
 460         struct sysfs_attribute *tmpattr;
 461         int i;
 462         int len;
 463
 464         if ((pair == NULL) || (pair->file[0] == '\0') || (pair->value == '\0'))
 465                 return -ENODEV;
 466
 467         tmpattr = find_sysfs_attribute(class_dev, sysfs_device, pair->file);
 468         if (tmpattr == NULL)
 469                 return -ENODEV;
 470
 471         /* strip trailing whitespace of value, if not asked to match for it */
 472         if (! isspace(pair->value[strlen(pair->value)-1])) {
 473                 i = len = strlen(tmpattr->value);
 474                 while (i > 0 &&  isspace(tmpattr->value[i-1]))
 475                         i--;
 476                 if (i < len) {
 477                         tmpattr->value[i] = '\0';
 478                         dbg("remove %i trailing whitespace chars from '%s'",
 479                             len - i, tmpattr->value);
 480                 }
 481         }
 482
 483         dbg("compare attribute '%s' value '%s' with '%s'",
 484                   pair->file, tmpattr->value, pair->value);
 485         if (strcmp_pattern(pair->value, tmpattr->value) != 0)
 486                 return -ENODEV;
 487
 488         dbg("found matching attribute '%s' with value '%s'",
 489             pair->file, pair->value);
 490         return 0;
 491 }
 492
 493 static int match_sysfs_pairs(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 494 {
 495         struct sysfs_pair *pair;
 496         int i;
 497
 498         for (i = 0; i < MAX_SYSFS_PAIRS; ++i) {
 499                 pair = &dev->sysfs_pair[i];
 500                 if ((pair->file[0] == '\0') || (pair->value[0] == '\0'))
 501                         break;
 502                 if (compare_sysfs_attribute(class_dev, sysfs_device, pair) != 0) {
 503                         dbg("sysfs attribute doesn't match");
 504                         return -ENODEV;
 505                 }
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int match_id(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 512 {
 513         char path[SYSFS_PATH_MAX];
 514         char *temp = NULL;
 515
 516         /* we have to have a sysfs device for ID to work */
 517         if (!sysfs_device)
 518                 return -ENODEV;
 519
 520         strfieldcpy(path, sysfs_device->path);
 521         temp = strrchr(path, '/');
 522         temp++;
 523         dbg("search '%s' in '%s', path='%s'", dev->id, temp, path);
 524         if (strcmp_pattern(dev->id, temp) != 0)
 525                 return -ENODEV;
 526         else
 527                 return 0;
 528 }
 529
 530 static int match_place(struct config_device *dev, struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 531 {
 532         char path[SYSFS_PATH_MAX];
 533         int found;
 534         char *temp = NULL;
 535
 536         /* we have to have a sysfs device for PLACE to work */
 537         if (!sysfs_device)
 538                 return -ENODEV;
 539
 540         found = 0;
 541         strfieldcpy(path, sysfs_device->path);
 542         temp = strrchr(path, '/');
 543         dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 544         if (strstr(temp, dev->place) != NULL) {
 545                 found = 1;
 546         } else {
 547                 *temp = 0x00;
 548                 temp = strrchr(path, '/');
 549                 dbg("search '%s' in '%s', path='%s'", dev->place, temp, path);
 550                 if (strstr(temp, dev->place) != NULL)
 551                         found = 1;
 552         }
 553         if (!found) {
 554                 dbg("place doesn't match");
 555                 return -ENODEV;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static int match_rule(struct udevice *udev, struct config_device *dev,
 562                       struct sysfs_class_device *class_dev, struct sysfs_device *sysfs_device)
 563 {
 564         while (1) {
 565                 /* check for matching bus value */
 566                 if (dev->bus[0] != '\0') {
 567                         if (sysfs_device == NULL) {
 568                                 dbg("device has no bus");
 569                                 goto try_parent;
 570                         }
 571                         dbg("check for " FIELD_BUS " dev->bus='%s' sysfs_device->bus='%s'",
 572                             dev->bus, sysfs_device->bus);
 573                         if (strcmp_pattern(dev->bus, sysfs_device->bus) != 0) {
 574                                 dbg(FIELD_BUS " is not matching");
 575                                 goto try_parent;
 576                         } else {
 577                                 dbg(FIELD_BUS " matches");
 578                         }
 579                 }
 580
 581                 /* check for matching kernel name */
 582                 if (dev->kernel[0] != '\0') {
 583                         dbg("check for " FIELD_KERNEL " dev->kernel='%s' class_dev->name='%s'",
 584                             dev->kernel, class_dev->name);
 585                         if (strcmp_pattern(dev->kernel, class_dev->name) != 0) {
 586                                 dbg(FIELD_KERNEL " is not matching");
 587                                 goto try_parent;
 588                         } else {
 589                                 dbg(FIELD_KERNEL " matches");
 590                         }
 591                 }
 592
 593                 /* check for matching subsystem */
 594                 if (dev->subsystem[0] != '\0') {
 595                         dbg("check for " FIELD_SUBSYSTEM " dev->subsystem='%s' class_dev->name='%s'",
 596                             dev->subsystem, class_dev->name);
 597                         if (strcmp_pattern(dev->subsystem, udev->subsystem) != 0) {
 598                                 dbg(FIELD_SUBSYSTEM " is not matching");
 599                                 goto try_parent;
 600                         } else {
 601                                 dbg(FIELD_SUBSYSTEM " matches");
 602                         }
 603                 }
 604
 605                 /* check for matching driver */
 606                 if (dev->driver[0] != '\0') {
 607                         dbg("check for " FIELD_DRIVER " dev->driver='%s' sysfs_device->driver_name='%s'",
 608                             dev->driver, sysfs_device->driver_name);
 609                         if (strcmp_pattern(dev->driver, sysfs_device->driver_name) != 0) {
 610                                 dbg(FIELD_DRIVER " is not matching");
 611                                 goto try_parent;
 612                         } else {
 613                                 dbg(FIELD_DRIVER " matches");
 614                         }
 615                 }
 616
 617                 /* check for matching bus id */
 618                 if (dev->id[0] != '\0') {
 619                         dbg("check " FIELD_ID);
 620                         if (match_id(dev, class_dev, sysfs_device) != 0) {
 621                                 dbg(FIELD_ID " is not matching");
 622                                 goto try_parent;
 623                         } else {
 624                                 dbg(FIELD_ID " matches");
 625                         }
 626                 }
 627
 628                 /* check for matching place of device */
 629                 if (dev->place[0] != '\0') {
 630                         dbg("check " FIELD_PLACE);
 631                         if (match_place(dev, class_dev, sysfs_device) != 0) {
 632                                 dbg(FIELD_PLACE " is not matching");
 633                                 goto try_parent;
 634                         } else {
 635                                 dbg(FIELD_PLACE " matches");
 636                         }
 637                 }
 638
 639                 /* check for matching sysfs pairs */
 640                 if (dev->sysfs_pair[0].file[0] != '\0') {
 641                         dbg("check " FIELD_SYSFS " pairs");
 642                         if (match_sysfs_pairs(dev, class_dev, sysfs_device) != 0) {
 643                                 dbg(FIELD_SYSFS " is not matching");
 644                                 goto try_parent;
 645                         } else {
 646                                 dbg(FIELD_SYSFS " matches");
 647                         }
 648                 }
 649
 650                 /* execute external program */
 651                 if (dev->program[0] != '\0') {
 652                         char program[PROGRAM_SIZE];
 653
 654                         dbg("check " FIELD_PROGRAM);
 655                         strfieldcpy(program, dev->program);
 656                         apply_format(udev, program, sizeof(program), class_dev, sysfs_device);
 657                         if (execute_program(udev, program, udev->program_result, NAME_SIZE) != 0) {
 658                                 dbg(FIELD_PROGRAM " returned nonzero");
 659                                 goto try_parent;
 660                         } else {
 661                                 dbg(FIELD_PROGRAM " returned successful");
 662                         }
 663                 }
 664
 665                 /* check for matching result of external program */
 666                 if (dev->result[0] != '\0') {
 667                         dbg("check for " FIELD_RESULT " dev->result='%s', udev->program_result='%s'",
 668                             dev->result, udev->program_result);
 669                         if (strcmp_pattern(dev->result, udev->program_result) != 0) {
 670                                 dbg(FIELD_RESULT " is not matching");
 671                                 goto try_parent;
 672                         } else {
 673                                 dbg(FIELD_RESULT " matches");
 674                         }
 675                 }
 676
 677                 /* Yeah, we matched! */
 678                 return 0;
 679
 680 try_parent:
 681                 dbg("try parent sysfs device");
 682                 sysfs_device = sysfs_get_device_parent(sysfs_device);
 683                 if (sysfs_device == NULL)
 684                         return -ENODEV;
 685                 dbg("sysfs_device->path='%s'", sysfs_device->path);
 686                 dbg("sysfs_device->bus_id='%s'", sysfs_device->bus_id);
 687         }
 688 }
 689
 690 int namedev_name_device(struct udevice *udev, struct sysfs_class_device *class_dev)
 691 {
 692         struct sysfs_class_device *class_dev_parent;
 693         struct sysfs_device *sysfs_device = NULL;
 694         struct config_device *dev;
 695         char *pos;
 696
 697         dbg("class_dev->name='%s'", class_dev->name);
 698
 699         /* Figure out where the "device"-symlink is at.  For char devices this will
 700          * always be in the class_dev->path.  On block devices, only the main block
 701          * device will have the device symlink in it's path. All partition devices
 702          * need to look at the symlink in its parent directory.
 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                 sysfs_device = sysfs_get_classdev_device(class_dev_parent);
 708         } else {
 709                 sysfs_device = sysfs_get_classdev_device(class_dev);
 710         }
 711
 712         if (sysfs_device) {
 713                 dbg("found devices device: path='%s', bus_id='%s', bus='%s'",
 714                     sysfs_device->path, sysfs_device->bus_id, sysfs_device->bus);
 715                 strfieldcpy(udev->bus_id, sysfs_device->bus_id);
 716         }
 717
 718         strfieldcpy(udev->kernel_name, class_dev->name);
 719         fix_kernel_name(udev);
 720         dbg("udev->kernel_name = '%s'", udev->kernel_name);
 721
 722         /* get kernel number */
 723         pos = class_dev->name + strlen(class_dev->name);
 724         while (isdigit(*(pos-1)))
 725                 pos--;
 726         strfieldcpy(udev->kernel_number, pos);
 727         dbg("kernel_number='%s'", udev->kernel_number);
 728
 729         /* look for a matching rule to apply */
 730         list_for_each_entry(dev, &config_device_list, node) {
 731                 dbg("process rule");
 732                 if (match_rule(udev, dev, class_dev, sysfs_device) == 0) {
 733
 734                         /* empty name, symlink and perms will not create any node */
 735                         if (dev->name[0] == '\0' && dev->symlink[0] == '\0' &&
 736                             dev->mode == 0000 && dev->owner[0] == '\0' && dev->group[0] == '\0') {
 737                                 info("configured rule in '%s[%i]' applied, '%s' is ignored",
 738                                      dev->config_file, dev->config_line, udev->kernel_name);
 739                                 return -1;
 740                         }
 741
 742                         /* apply permissions */
 743                         if (dev->mode != 0000) {
 744                                 udev->mode = dev->mode;
 745                                 dbg("applied mode=%#o to '%s'", udev->mode, udev->kernel_name);
 746                         }
 747                         if (dev->owner[0] != '\0') {
 748                                 strfieldcpy(udev->owner, dev->owner);
 749                                 apply_format(udev, udev->owner, sizeof(udev->owner), class_dev, sysfs_device);
 750                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->kernel_name);
 751                         }
 752                         if (dev->group[0] != '\0') {
 753                                 strfieldcpy(udev->group, dev->group);
 754                                 apply_format(udev, udev->group, sizeof(udev->group), class_dev, sysfs_device);
 755                                 dbg("applied group='%s' to '%s'", udev->group, udev->kernel_name);
 756                         }
 757
 758                         /* collect symlinks for this or the final matching rule */
 759                         if (dev->symlink[0] != '\0') {
 760                                 char temp[NAME_SIZE];
 761
 762                                 info("configured rule in '%s[%i]' applied, added symlink '%s'",
 763                                      dev->config_file, dev->config_line, dev->symlink);
 764                                 strfieldcpy(temp, dev->symlink);
 765                                 apply_format(udev, temp, sizeof(temp), class_dev, sysfs_device);
 766                                 if (udev->symlink[0] != '\0')
 767                                         strfieldcat(udev->symlink, " ");
 768                                 strfieldcat(udev->symlink, temp);
 769                         }
 770
 771                         /* rule matches */
 772                         if (dev->name[0] != '\0') {
 773                                 /* apply all_partitions flag only at a main block device */
 774                                 if (dev->partitions > 0 &&
 775                                     (udev->type != 'b' || udev->kernel_number[0] != '\0'))
 776                                         continue;
 777
 778                                 info("configured rule in '%s[%i]' applied, '%s' becomes '%s'",
 779                                      dev->config_file, dev->config_line, udev->kernel_name, dev->name);
 780
 781                                 strfieldcpy(udev->name, dev->name);
 782                                 apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
 783                                 strfieldcpy(udev->config_file, dev->config_file);
 784                                 udev->config_line = dev->config_line;
 785                                 udev->ignore_remove = dev->ignore_remove;
 786
 787                                 if (udev->type == 'n')
 788                                         goto exit;
 789
 790                                 udev->partitions = dev->partitions;
 791
 792                                 dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 793                                     udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 794
 795                                 goto exit;
 796                         }
 797                 }
 798         }
 799
 800         /* no rule matched, so we use the kernel name */
 801         strfieldcpy(udev->name, udev->kernel_name);
 802         dbg("no rule found, use kernel name '%s'", udev->name);
 803
 804 exit:
 805         if (udev->tmp_node[0] != '\0') {
 806                 dbg("removing temporary device node");
 807                 unlink_secure(udev->tmp_node);
 808                 udev->tmp_node[0] = '\0';
 809         }
 810
 811         return 0;
 812 }