sysfs.c

   1 /*
   2  * sysfs - extract md related information from sysfs.  Part of:
   3  * mdadm - manage Linux "md" devices aka RAID arrays.
   4  *
   5  * Copyright (C) 2006-2009 Neil Brown <neilb@suse.de>
   6  *
   7  *
   8  *    This program is free software; you can redistribute it and/or modify
   9  *    it under the terms of the GNU General Public License as published by
  10  *    the Free Software Foundation; either version 2 of the License, or
  11  *    (at your option) any later version.
  12  *
  13  *    This program is distributed in the hope that it will be useful,
  14  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *    GNU General Public License for more details.
  17  *
  18  *    You should have received a copy of the GNU General Public License
  19  *    along with this program; if not, write to the Free Software
  20  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  *    Author: Neil Brown
  23  *    Email: <neilb@suse.de>
  24  */
  25
  26 #include        "mdadm.h"
  27 #include        <dirent.h>
  28 #include        <ctype.h>
  29
  30 #define MAX_SYSFS_PATH_LEN      120
  31
  32 int load_sys(char *path, char *buf, int len)
  33 {
  34         int fd = open(path, O_RDONLY);
  35         int n;
  36         if (fd < 0)
  37                 return -1;
  38         n = read(fd, buf, len);
  39         close(fd);
  40         if (n <0 || n >= len)
  41                 return -1;
  42         buf[n] = 0;
  43         if (n && buf[n-1] == '\n')
  44                 buf[n-1] = 0;
  45         return 0;
  46 }
  47
  48 void sysfs_free(struct mdinfo *sra)
  49 {
  50         while (sra) {
  51                 struct mdinfo *sra2 = sra->next;
  52                 while (sra->devs) {
  53                         struct mdinfo *d = sra->devs;
  54                         sra->devs = d->next;
  55                         free(d->bb.entries);
  56                         free(d);
  57                 }
  58                 free(sra->bb.entries);
  59                 free(sra);
  60                 sra = sra2;
  61         }
  62 }
  63
  64 int sysfs_open(char *devnm, char *devname, char *attr)
  65 {
  66         char fname[MAX_SYSFS_PATH_LEN];
  67         int fd;
  68
  69         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/", devnm);
  70         if (devname) {
  71                 strncat(fname, devname, MAX_SYSFS_PATH_LEN - strlen(fname));
  72                 strncat(fname, "/", MAX_SYSFS_PATH_LEN - strlen(fname));
  73         }
  74         strncat(fname, attr, MAX_SYSFS_PATH_LEN - strlen(fname));
  75         fd = open(fname, O_RDWR);
  76         if (fd < 0 && errno == EACCES)
  77                 fd = open(fname, O_RDONLY);
  78         return fd;
  79 }
  80
  81 void sysfs_init_dev(struct mdinfo *mdi, unsigned long devid)
  82 {
  83         snprintf(mdi->sys_name,
  84                  sizeof(mdi->sys_name), "dev-%s", devid2kname(devid));
  85 }
  86
  87 int sysfs_init(struct mdinfo *mdi, int fd, char *devnm)
  88 {
  89         struct stat stb;
  90         char fname[MAX_SYSFS_PATH_LEN];
  91         int retval = -ENODEV;
  92
  93         mdi->sys_name[0] = 0;
  94         if (fd >= 0)
  95                 devnm = fd2devnm(fd);
  96
  97         if (devnm == NULL)
  98                 goto out;
  99
 100         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md", devnm);
 101
 102         if (stat(fname, &stb))
 103                 goto out;
 104         if (!S_ISDIR(stb.st_mode))
 105                 goto out;
 106         strcpy(mdi->sys_name, devnm);
 107
 108         retval = 0;
 109 out:
 110         return retval;
 111 }
 112
 113 struct mdinfo *sysfs_read(int fd, char *devnm, unsigned long options)
 114 {
 115         char fname[PATH_MAX];
 116         char buf[PATH_MAX];
 117         char *base;
 118         char *dbase;
 119         struct mdinfo *sra;
 120         struct mdinfo *dev, **devp;
 121         DIR *dir = NULL;
 122         struct dirent *de;
 123
 124         sra = xcalloc(1, sizeof(*sra));
 125         if (sysfs_init(sra, fd, devnm)) {
 126                 free(sra);
 127                 return NULL;
 128         }
 129
 130         sprintf(fname, "/sys/block/%s/md/", sra->sys_name);
 131         base = fname + strlen(fname);
 132
 133         sra->devs = NULL;
 134         if (options & GET_VERSION) {
 135                 strcpy(base, "metadata_version");
 136                 if (load_sys(fname, buf, sizeof(buf)))
 137                         goto abort;
 138                 if (strncmp(buf, "none", 4) == 0) {
 139                         sra->array.major_version =
 140                                 sra->array.minor_version = -1;
 141                         strcpy(sra->text_version, "");
 142                 } else if (strncmp(buf, "external:", 9) == 0) {
 143                         sra->array.major_version = -1;
 144                         sra->array.minor_version = -2;
 145                         strcpy(sra->text_version, buf+9);
 146                 } else {
 147                         sscanf(buf, "%d.%d",
 148                                &sra->array.major_version,
 149                                &sra->array.minor_version);
 150                         strcpy(sra->text_version, buf);
 151                 }
 152         }
 153         if (options & GET_LEVEL) {
 154                 strcpy(base, "level");
 155                 if (load_sys(fname, buf, sizeof(buf)))
 156                         goto abort;
 157                 sra->array.level = map_name(pers, buf);
 158         }
 159         if (options & GET_LAYOUT) {
 160                 strcpy(base, "layout");
 161                 if (load_sys(fname, buf, sizeof(buf)))
 162                         goto abort;
 163                 sra->array.layout = strtoul(buf, NULL, 0);
 164         }
 165         if (options & GET_DISKS) {
 166                 strcpy(base, "raid_disks");
 167                 if (load_sys(fname, buf, sizeof(buf)))
 168                         goto abort;
 169                 sra->array.raid_disks = strtoul(buf, NULL, 0);
 170         }
 171         if (options & GET_DEGRADED) {
 172                 strcpy(base, "degraded");
 173                 if (load_sys(fname, buf, sizeof(buf)))
 174                         goto abort;
 175                 sra->array.failed_disks = strtoul(buf, NULL, 0);
 176         }
 177         if (options & GET_COMPONENT) {
 178                 strcpy(base, "component_size");
 179                 if (load_sys(fname, buf, sizeof(buf)))
 180                         goto abort;
 181                 sra->component_size = strtoull(buf, NULL, 0);
 182                 /* sysfs reports "K", but we want sectors */
 183                 sra->component_size *= 2;
 184         }
 185         if (options & GET_CHUNK) {
 186                 strcpy(base, "chunk_size");
 187                 if (load_sys(fname, buf, sizeof(buf)))
 188                         goto abort;
 189                 sra->array.chunk_size = strtoul(buf, NULL, 0);
 190         }
 191         if (options & GET_CACHE) {
 192                 strcpy(base, "stripe_cache_size");
 193                 if (load_sys(fname, buf, sizeof(buf)))
 194                         /* Probably level doesn't support it */
 195                         sra->cache_size = 0;
 196                 else
 197                         sra->cache_size = strtoul(buf, NULL, 0);
 198         }
 199         if (options & GET_MISMATCH) {
 200                 strcpy(base, "mismatch_cnt");
 201                 if (load_sys(fname, buf, sizeof(buf)))
 202                         goto abort;
 203                 sra->mismatch_cnt = strtoul(buf, NULL, 0);
 204         }
 205         if (options & GET_SAFEMODE) {
 206                 int scale = 1;
 207                 int dot = 0;
 208                 unsigned i;
 209                 unsigned long msec;
 210                 size_t len;
 211
 212                 strcpy(base, "safe_mode_delay");
 213                 if (load_sys(fname, buf, sizeof(buf)))
 214                         goto abort;
 215
 216                 /* remove a period, and count digits after it */
 217                 len = strlen(buf);
 218                 for (i = 0; i < len; i++) {
 219                         if (dot) {
 220                                 if (isdigit(buf[i])) {
 221                                         buf[i-1] = buf[i];
 222                                         scale *= 10;
 223                                 }
 224                                 buf[i] = 0;
 225                         } else if (buf[i] == '.') {
 226                                 dot=1;
 227                                 buf[i] = 0;
 228                         }
 229                 }
 230                 msec = strtoul(buf, NULL, 10);
 231                 msec = (msec * 1000) / scale;
 232                 sra->safe_mode_delay = msec;
 233         }
 234         if (options & GET_BITMAP_LOCATION) {
 235                 strcpy(base, "bitmap/location");
 236                 if (load_sys(fname, buf, sizeof(buf)))
 237                         goto abort;
 238                 if (strncmp(buf, "file", 4) == 0)
 239                         sra->bitmap_offset = 1;
 240                 else if (strncmp(buf, "none", 4) == 0)
 241                         sra->bitmap_offset = 0;
 242                 else if (buf[0] == '+')
 243                         sra->bitmap_offset = strtol(buf+1, NULL, 10);
 244                 else
 245                         goto abort;
 246         }
 247
 248         if (options & GET_ARRAY_STATE) {
 249                 strcpy(base, "array_state");
 250                 if (load_sys(fname, buf, sizeof(buf)))
 251                         goto abort;
 252                 sra->array_state = map_name(sysfs_array_states, buf);
 253                 if (sra->array_state == UnSet)
 254                         sra->array_state = ARRAY_UNKNOWN_STATE;
 255         }
 256
 257         if (options & GET_CONSISTENCY_POLICY) {
 258                 strcpy(base, "consistency_policy");
 259                 if (load_sys(fname, buf, sizeof(buf))) {
 260                         sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN;
 261                 } else {
 262                         sra->consistency_policy = map_name(consistency_policies, buf);
 263                         if (sra->consistency_policy == UnSet)
 264                                 sra->consistency_policy = CONSISTENCY_POLICY_UNKNOWN;
 265                 }
 266         }
 267
 268         if (! (options & GET_DEVS))
 269                 return sra;
 270
 271         /* Get all the devices as well */
 272         *base = 0;
 273         dir = opendir(fname);
 274         if (!dir)
 275                 goto abort;
 276         sra->array.spare_disks = 0;
 277
 278         devp = &sra->devs;
 279         sra->devs = NULL;
 280         while ((de = readdir(dir)) != NULL) {
 281                 char *ep;
 282                 if (de->d_ino == 0 ||
 283                     strncmp(de->d_name, "dev-", 4) != 0)
 284                         continue;
 285                 strcpy(base, de->d_name);
 286                 dbase = base + strlen(base);
 287                 *dbase++ = '/';
 288
 289                 dev = xcalloc(1, sizeof(*dev));
 290
 291                 /* Always get slot, major, minor */
 292                 strcpy(dbase, "slot");
 293                 if (load_sys(fname, buf, sizeof(buf))) {
 294                         /* hmm... unable to read 'slot' maybe the device
 295                          * is going away?
 296                          */
 297                         strcpy(dbase, "block");
 298                         if (readlink(fname, buf, sizeof(buf)) < 0 &&
 299                             errno != ENAMETOOLONG) {
 300                                 /* ...yup device is gone */
 301                                 free(dev);
 302                                 continue;
 303                         } else {
 304                                 /* slot is unreadable but 'block' link
 305                                  * still intact... something bad is happening
 306                                  * so abort
 307                                  */
 308                                 free(dev);
 309                                 goto abort;
 310                         }
 311
 312                 }
 313                 strcpy(dev->sys_name, de->d_name);
 314                 dev->disk.raid_disk = strtoul(buf, &ep, 10);
 315                 if (*ep) dev->disk.raid_disk = -1;
 316
 317                 strcpy(dbase, "block/dev");
 318                 if (load_sys(fname, buf, sizeof(buf))) {
 319                         /* assume this is a stale reference to a hot
 320                          * removed device
 321                          */
 322                         free(dev);
 323                         continue;
 324                 }
 325                 sra->array.nr_disks++;
 326                 sscanf(buf, "%d:%d", &dev->disk.major, &dev->disk.minor);
 327
 328                 /* special case check for block devices that can go 'offline' */
 329                 strcpy(dbase, "block/device/state");
 330                 if (load_sys(fname, buf, sizeof(buf)) == 0 &&
 331                     strncmp(buf, "offline", 7) == 0) {
 332                         free(dev);
 333                         continue;
 334                 }
 335
 336                 /* finally add this disk to the array */
 337                 *devp = dev;
 338                 devp = & dev->next;
 339                 dev->next = NULL;
 340
 341                 if (options & GET_OFFSET) {
 342                         strcpy(dbase, "offset");
 343                         if (load_sys(fname, buf, sizeof(buf)))
 344                                 goto abort;
 345                         dev->data_offset = strtoull(buf, NULL, 0);
 346                         strcpy(dbase, "new_offset");
 347                         if (load_sys(fname, buf, sizeof(buf)) == 0)
 348                                 dev->new_data_offset = strtoull(buf, NULL, 0);
 349                         else
 350                                 dev->new_data_offset = dev->data_offset;
 351                 }
 352                 if (options & GET_SIZE) {
 353                         strcpy(dbase, "size");
 354                         if (load_sys(fname, buf, sizeof(buf)))
 355                                 goto abort;
 356                         dev->component_size = strtoull(buf, NULL, 0) * 2;
 357                 }
 358                 if (options & GET_STATE) {
 359                         dev->disk.state = 0;
 360                         strcpy(dbase, "state");
 361                         if (load_sys(fname, buf, sizeof(buf)))
 362                                 goto abort;
 363                         if (strstr(buf, "in_sync"))
 364                                 dev->disk.state |= (1<<MD_DISK_SYNC);
 365                         if (strstr(buf, "faulty"))
 366                                 dev->disk.state |= (1<<MD_DISK_FAULTY);
 367                         if (dev->disk.state == 0)
 368                                 sra->array.spare_disks++;
 369                 }
 370                 if (options & GET_ERROR) {
 371                         strcpy(buf, "errors");
 372                         if (load_sys(fname, buf, sizeof(buf)))
 373                                 goto abort;
 374                         dev->errors = strtoul(buf, NULL, 0);
 375                 }
 376         }
 377         closedir(dir);
 378         return sra;
 379
 380  abort:
 381         if (dir)
 382                 closedir(dir);
 383         sysfs_free(sra);
 384         return NULL;
 385 }
 386
 387 int sysfs_attr_match(const char *attr, const char *str)
 388 {
 389         /* See if attr, read from a sysfs file, matches
 390          * str.  They must either be the same, or attr can
 391          * have a trailing newline or comma
 392          */
 393         while (*attr && *str && *attr == *str) {
 394                 attr++;
 395                 str++;
 396         }
 397
 398         if (*str || (*attr && *attr != ',' && *attr != '\n'))
 399                 return 0;
 400         return 1;
 401 }
 402
 403 int sysfs_match_word(const char *word, char **list)
 404 {
 405         int n;
 406         for (n=0; list[n]; n++)
 407                 if (sysfs_attr_match(word, list[n]))
 408                         break;
 409         return n;
 410 }
 411
 412 unsigned long long get_component_size(int fd)
 413 {
 414         /* Find out the component size of the array.
 415          * We cannot trust GET_ARRAY_INFO ioctl as it's
 416          * size field is only 32bits.
 417          * So look in /sys/block/mdXXX/md/component_size
 418          *
 419          * This returns in units of sectors.
 420          */
 421         struct stat stb;
 422         char fname[MAX_SYSFS_PATH_LEN];
 423         int n;
 424         if (fstat(fd, &stb))
 425                 return 0;
 426         snprintf(fname, MAX_SYSFS_PATH_LEN,
 427                  "/sys/block/%s/md/component_size", stat2devnm(&stb));
 428         fd = open(fname, O_RDONLY);
 429         if (fd < 0)
 430                 return 0;
 431         n = read(fd, fname, sizeof(fname));
 432         close(fd);
 433         if (n < 0 || n == sizeof(fname))
 434                 return 0;
 435         fname[n] = 0;
 436         return strtoull(fname, NULL, 10) * 2;
 437 }
 438
 439 int sysfs_set_str(struct mdinfo *sra, struct mdinfo *dev,
 440                   char *name, char *val)
 441 {
 442         char fname[MAX_SYSFS_PATH_LEN];
 443         unsigned int n;
 444         int fd;
 445
 446         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 447                 sra->sys_name, dev?dev->sys_name:"", name);
 448         fd = open(fname, O_WRONLY);
 449         if (fd < 0)
 450                 return -1;
 451         n = write(fd, val, strlen(val));
 452         close(fd);
 453         if (n != strlen(val)) {
 454                 dprintf("failed to write '%s' to '%s' (%s)\n",
 455                         val, fname, strerror(errno));
 456                 return -1;
 457         }
 458         return 0;
 459 }
 460
 461 int sysfs_set_num(struct mdinfo *sra, struct mdinfo *dev,
 462                   char *name, unsigned long long val)
 463 {
 464         char valstr[50];
 465         sprintf(valstr, "%llu", val);
 466         return sysfs_set_str(sra, dev, name, valstr);
 467 }
 468
 469 int sysfs_set_num_signed(struct mdinfo *sra, struct mdinfo *dev,
 470                          char *name, long long val)
 471 {
 472         char valstr[50];
 473         sprintf(valstr, "%lli", val);
 474         return sysfs_set_str(sra, dev, name, valstr);
 475 }
 476
 477 int sysfs_uevent(struct mdinfo *sra, char *event)
 478 {
 479         char fname[MAX_SYSFS_PATH_LEN];
 480         int n;
 481         int fd;
 482
 483         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/uevent",
 484                 sra->sys_name);
 485         fd = open(fname, O_WRONLY);
 486         if (fd < 0)
 487                 return -1;
 488         n = write(fd, event, strlen(event));
 489         close(fd);
 490         if (n != (int)strlen(event)) {
 491                 dprintf("failed to write '%s' to '%s' (%s)\n",
 492                         event, fname, strerror(errno));
 493                 return -1;
 494         }
 495         return 0;
 496 }
 497
 498 int sysfs_attribute_available(struct mdinfo *sra, struct mdinfo *dev, char *name)
 499 {
 500         char fname[MAX_SYSFS_PATH_LEN];
 501         struct stat st;
 502
 503         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 504                 sra->sys_name, dev?dev->sys_name:"", name);
 505
 506         return stat(fname, &st) == 0;
 507 }
 508
 509 int sysfs_get_fd(struct mdinfo *sra, struct mdinfo *dev,
 510                        char *name)
 511 {
 512         char fname[MAX_SYSFS_PATH_LEN];
 513         int fd;
 514
 515         snprintf(fname, MAX_SYSFS_PATH_LEN, "/sys/block/%s/md/%s/%s",
 516                 sra->sys_name, dev?dev->sys_name:"", name);
 517         fd = open(fname, O_RDWR);
 518         if (fd < 0)
 519                 fd = open(fname, O_RDONLY);
 520         return fd;
 521 }
 522
 523 int sysfs_fd_get_ll(int fd, unsigned long long *val)
 524 {
 525         char buf[50];
 526         int n;
 527         char *ep;
 528
 529         lseek(fd, 0, 0);
 530         n = read(fd, buf, sizeof(buf));
 531         if (n <= 0 || n == sizeof(buf))
 532                 return -2;
 533         buf[n] = 0;
 534         *val = strtoull(buf, &ep, 0);
 535         if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
 536                 return -1;
 537         return 0;
 538 }
 539
 540 int sysfs_get_ll(struct mdinfo *sra, struct mdinfo *dev,
 541                        char *name, unsigned long long *val)
 542 {
 543         int n;
 544         int fd;
 545
 546         fd = sysfs_get_fd(sra, dev, name);
 547         if (fd < 0)
 548                 return -1;
 549         n = sysfs_fd_get_ll(fd, val);
 550         close(fd);
 551         return n;
 552 }
 553
 554 int sysfs_fd_get_two(int fd, unsigned long long *v1, unsigned long long *v2)
 555 {
 556         /* two numbers in this sysfs file, either
 557          *  NNN (NNN)
 558          * or
 559          *  NNN / NNN
 560          */
 561         char buf[80];
 562         int n;
 563         char *ep, *ep2;
 564
 565         lseek(fd, 0, 0);
 566         n = read(fd, buf, sizeof(buf));
 567         if (n <= 0 || n == sizeof(buf))
 568                 return -2;
 569         buf[n] = 0;
 570         *v1 = strtoull(buf, &ep, 0);
 571         if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' '))
 572                 return -1;
 573         while (*ep == ' ' || *ep == '/' || *ep == '(')
 574                 ep++;
 575         *v2 = strtoull(ep, &ep2, 0);
 576         if (ep2 == ep || (*ep2 != 0 && *ep2 != '\n' && *ep2 != ' ' && *ep2 != ')')) {
 577                 *v2 = *v1;
 578                 return 1;
 579         }
 580         return 2;
 581 }
 582
 583 int sysfs_get_two(struct mdinfo *sra, struct mdinfo *dev,
 584                   char *name, unsigned long long *v1, unsigned long long *v2)
 585 {
 586         int n;
 587         int fd;
 588
 589         fd = sysfs_get_fd(sra, dev, name);
 590         if (fd < 0)
 591                 return -1;
 592         n = sysfs_fd_get_two(fd, v1, v2);
 593         close(fd);
 594         return n;
 595 }
 596
 597 int sysfs_fd_get_str(int fd, char *val, int size)
 598 {
 599         int n;
 600
 601         lseek(fd, 0, 0);
 602         n = read(fd, val, size);
 603         if (n <= 0 || n == size)
 604                 return -1;
 605         val[n] = 0;
 606         return n;
 607 }
 608
 609 int sysfs_get_str(struct mdinfo *sra, struct mdinfo *dev,
 610                        char *name, char *val, int size)
 611 {
 612         int n;
 613         int fd;
 614
 615         fd = sysfs_get_fd(sra, dev, name);
 616         if (fd < 0)
 617                 return -1;
 618         n = sysfs_fd_get_str(fd, val, size);
 619         close(fd);
 620         return n;
 621 }
 622
 623 int sysfs_set_safemode(struct mdinfo *sra, unsigned long ms)
 624 {
 625         unsigned long sec;
 626         unsigned long msec;
 627         char delay[30];
 628
 629         sec = ms / 1000;
 630         msec = ms % 1000;
 631
 632         sprintf(delay, "%ld.%03ld\n", sec, msec);
 633         /*             this '\n' ^ needed for kernels older than 2.6.28 */
 634         return sysfs_set_str(sra, NULL, "safe_mode_delay", delay);
 635 }
 636
 637 int sysfs_set_array(struct mdinfo *info, int vers)
 638 {
 639         int rv = 0;
 640         char ver[100];
 641         int raid_disks = info->array.raid_disks;
 642
 643         ver[0] = 0;
 644         if (info->array.major_version == -1 &&
 645             info->array.minor_version == -2) {
 646                 char buf[1024];
 647
 648                 strcat(strcpy(ver, "external:"), info->text_version);
 649
 650                 /* meta version might already be set if we are setting
 651                  * new geometry for a reshape.  In that case we don't
 652                  * want to over-write the 'readonly' flag that is
 653                  * stored in the metadata version.  So read the current
 654                  * version first, and preserve the flag
 655                  */
 656                 if (sysfs_get_str(info, NULL, "metadata_version",
 657                                   buf, 1024) > 0)
 658                         if (strlen(buf) >= 9 && buf[9] == '-')
 659                                 ver[9] = '-';
 660
 661                 if ((vers % 100) < 2 ||
 662                     sysfs_set_str(info, NULL, "metadata_version",
 663                                   ver) < 0) {
 664                         pr_err("This kernel does not support external metadata.\n");
 665                         return 1;
 666                 }
 667         }
 668         if (info->array.level < 0)
 669                 return 0; /* FIXME */
 670         rv |= sysfs_set_str(info, NULL, "level",
 671                             map_num(pers, info->array.level));
 672         if (info->reshape_active && info->delta_disks != UnSet)
 673                 raid_disks -= info->delta_disks;
 674         rv |= sysfs_set_num(info, NULL, "raid_disks", raid_disks);
 675         rv |= sysfs_set_num(info, NULL, "chunk_size", info->array.chunk_size);
 676         rv |= sysfs_set_num(info, NULL, "layout", info->array.layout);
 677         rv |= sysfs_set_num(info, NULL, "component_size", info->component_size/2);
 678         if (info->custom_array_size) {
 679                 int rc;
 680
 681                 rc = sysfs_set_num(info, NULL, "array_size",
 682                                    info->custom_array_size/2);
 683                 if (rc && errno == ENOENT) {
 684                         pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
 685                         rc = 0;
 686                 }
 687                 rv |= rc;
 688         }
 689
 690         if (info->array.level > 0)
 691                 rv |= sysfs_set_num(info, NULL, "resync_start", info->resync_start);
 692
 693         if (info->reshape_active) {
 694                 rv |= sysfs_set_num(info, NULL, "reshape_position",
 695                                     info->reshape_progress);
 696                 rv |= sysfs_set_num(info, NULL, "chunk_size", info->new_chunk);
 697                 rv |= sysfs_set_num(info, NULL, "layout", info->new_layout);
 698                 rv |= sysfs_set_num(info, NULL, "raid_disks",
 699                                     info->array.raid_disks);
 700                 /* We don't set 'new_level' here.  That can only happen
 701                  * once the reshape completes.
 702                  */
 703         }
 704
 705         if (info->consistency_policy == CONSISTENCY_POLICY_PPL) {
 706                 if (sysfs_set_str(info, NULL, "consistency_policy",
 707                                   map_num(consistency_policies,
 708                                           info->consistency_policy))) {
 709                         pr_err("This kernel does not support PPL\n");
 710                         return 1;
 711                 }
 712         }
 713
 714         return rv;
 715 }
 716
 717 int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd, int resume)
 718 {
 719         char dv[PATH_MAX];
 720         char nm[PATH_MAX];
 721         char *dname;
 722         int rv;
 723         int i;
 724
 725         sprintf(dv, "%d:%d", sd->disk.major, sd->disk.minor);
 726         rv = sysfs_set_str(sra, NULL, "new_dev", dv);
 727         if (rv)
 728                 return rv;
 729
 730         memset(nm, 0, sizeof(nm));
 731         dname = devid2kname(makedev(sd->disk.major, sd->disk.minor));
 732         strcpy(sd->sys_name, "dev-");
 733         strcpy(sd->sys_name+4, dname);
 734
 735         /* test write to see if 'recovery_start' is available */
 736         if (resume && sd->recovery_start < MaxSector &&
 737             sysfs_set_num(sra, sd, "recovery_start", 0)) {
 738                 sysfs_set_str(sra, sd, "state", "remove");
 739                 return -1;
 740         }
 741
 742         rv = sysfs_set_num(sra, sd, "offset", sd->data_offset);
 743         rv |= sysfs_set_num(sra, sd, "size", (sd->component_size+1) / 2);
 744         if (sra->array.level != LEVEL_CONTAINER) {
 745                 if (sd->consistency_policy == CONSISTENCY_POLICY_PPL) {
 746                         rv |= sysfs_set_num(sra, sd, "ppl_sector", sd->ppl_sector);
 747                         rv |= sysfs_set_num(sra, sd, "ppl_size", sd->ppl_size);
 748                 }
 749                 if (sd->recovery_start == MaxSector)
 750                         /* This can correctly fail if array isn't started,
 751                          * yet, so just ignore status for now.
 752                          */
 753                         sysfs_set_str(sra, sd, "state", "insync");
 754                 if (sd->disk.raid_disk >= 0)
 755                         rv |= sysfs_set_num(sra, sd, "slot", sd->disk.raid_disk);
 756                 if (resume)
 757                         sysfs_set_num(sra, sd, "recovery_start", sd->recovery_start);
 758         }
 759         if (sd->bb.supported) {
 760                 if (sysfs_set_str(sra, sd, "state", "external_bbl")) {
 761                         /*
 762                          * backward compatibility - if kernel doesn't support
 763                          * bad blocks for external metadata, let it continue
 764                          * as long as there are none known so far
 765                          */
 766                         if (sd->bb.count) {
 767                                 pr_err("The kernel has no support for bad blocks in external metadata\n");
 768                                 return -1;
 769                         }
 770                 }
 771
 772                 for (i = 0; i < sd->bb.count; i++) {
 773                         char s[30];
 774                         const struct md_bb_entry *entry = &sd->bb.entries[i];
 775
 776                         snprintf(s, sizeof(s) - 1, "%llu %d\n", entry->sector,
 777                                  entry->length);
 778                         rv |= sysfs_set_str(sra, sd, "bad_blocks", s);
 779                 }
 780         }
 781         return rv;
 782 }
 783
 784 #if 0
 785 int sysfs_disk_to_sg(int fd)
 786 {
 787         /* from an open block device, try find and open its corresponding
 788          * scsi_generic interface
 789          */
 790         struct stat st;
 791         char path[256];
 792         char sg_path[256];
 793         char sg_major_minor[10];
 794         char *c;
 795         DIR *dir;
 796         struct dirent *de;
 797         int major, minor, rv;
 798
 799         if (fstat(fd, &st))
 800                 return -1;
 801
 802         snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device",
 803                  major(st.st_rdev), minor(st.st_rdev));
 804
 805         dir = opendir(path);
 806         if (!dir)
 807                 return -1;
 808
 809         de = readdir(dir);
 810         while (de) {
 811                 if (strncmp("scsi_generic:", de->d_name,
 812                             strlen("scsi_generic:")) == 0)
 813                         break;
 814                 de = readdir(dir);
 815         }
 816         closedir(dir);
 817
 818         if (!de)
 819                 return -1;
 820
 821         snprintf(sg_path, sizeof(sg_path), "%s/%s/dev", path, de->d_name);
 822         fd = open(sg_path, O_RDONLY);
 823         if (fd < 0)
 824                 return fd;
 825
 826         rv = read(fd, sg_major_minor, sizeof(sg_major_minor));
 827         close(fd);
 828         if (rv < 0 || rv == sizeof(sg_major_minor))
 829                 return -1;
 830         else
 831                 sg_major_minor[rv - 1] = '\0';
 832
 833         c = strchr(sg_major_minor, ':');
 834         *c = '\0';
 835         c++;
 836         major = strtol(sg_major_minor, NULL, 10);
 837         minor = strtol(c, NULL, 10);
 838         snprintf(path, sizeof(path), "/dev/.tmp.md.%d:%d:%d",
 839                  (int) getpid(), major, minor);
 840         if (mknod(path, S_IFCHR|0600, makedev(major, minor))==0) {
 841                         fd = open(path, O_RDONLY);
 842                         unlink(path);
 843                         return fd;
 844         }
 845
 846         return -1;
 847 }
 848 #endif
 849
 850 int sysfs_disk_to_scsi_id(int fd, __u32 *id)
 851 {
 852         /* from an open block device, try to retrieve it scsi_id */
 853         struct stat st;
 854         char path[256];
 855         DIR *dir;
 856         struct dirent *de;
 857         int host, bus, target, lun;
 858
 859         if (fstat(fd, &st))
 860                 return 1;
 861
 862         snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/device/scsi_device",
 863                  major(st.st_rdev), minor(st.st_rdev));
 864
 865         dir = opendir(path);
 866         if (!dir)
 867                 return 1;
 868
 869         for (de = readdir(dir); de; de = readdir(dir)) {
 870                 int count;
 871
 872                 if (de->d_type != DT_DIR)
 873                         continue;
 874
 875                 count = sscanf(de->d_name, "%d:%d:%d:%d", &host, &bus, &target, &lun);
 876                 if (count == 4)
 877                         break;
 878         }
 879         closedir(dir);
 880
 881         if (!de)
 882                 return 1;
 883
 884         *id = (host << 24) | (bus << 16) | (target << 8) | (lun << 0);
 885         return 0;
 886 }
 887
 888 int sysfs_unique_holder(char *devnm, long rdev)
 889 {
 890         /* Check that devnm is a holder of rdev,
 891          * and is the only holder.
 892          * we should be locked against races by
 893          * an O_EXCL on devnm
 894          * Return values:
 895          *  0 - not unique, not even a holder
 896          *  1 - unique, this is the only holder.
 897          *  2/3 - not unique, there is another holder
 898          * -1 - error, cannot find the holders
 899          */
 900         DIR *dir;
 901         struct dirent *de;
 902         char dirname[100];
 903         char l;
 904         int ret = 0;
 905         sprintf(dirname, "/sys/dev/block/%d:%d/holders",
 906                 major(rdev), minor(rdev));
 907         dir = opendir(dirname);
 908         if (!dir)
 909                 return -1;
 910         l = strlen(dirname);
 911         while ((de = readdir(dir)) != NULL) {
 912                 char buf[100];
 913                 char *sl;
 914                 int n;
 915
 916                 if (de->d_ino == 0)
 917                         continue;
 918                 if (de->d_name[0] == '.')
 919                         continue;
 920                 strcpy(dirname+l, "/");
 921                 strcat(dirname+l, de->d_name);
 922                 n = readlink(dirname, buf, sizeof(buf)-1);
 923                 if (n <= 0)
 924                         continue;
 925                 buf[n] = 0;
 926                 sl = strrchr(buf, '/');
 927                 if (!sl)
 928                         continue;
 929                 sl++;
 930
 931                 if (strcmp(devnm, sl) == 0)
 932                         ret |= 1;
 933                 else
 934                         ret |= 2;
 935         }
 936         closedir(dir);
 937         return ret;
 938 }
 939
 940 int sysfs_freeze_array(struct mdinfo *sra)
 941 {
 942         /* Try to freeze resync/rebuild on this array/container.
 943          * Return -1 if the array is busy,
 944          * return 0 if this kernel doesn't support 'frozen'
 945          * return 1 if it worked.
 946          */
 947         char buf[20];
 948
 949         if (!sysfs_attribute_available(sra, NULL, "sync_action"))
 950                 return 1; /* no sync_action == frozen */
 951         if (sysfs_get_str(sra, NULL, "sync_action", buf, 20) <= 0)
 952                 return 0;
 953         if (strcmp(buf, "frozen\n") == 0)
 954                 /* Already frozen */
 955                 return 0;
 956         if (strcmp(buf, "idle\n") != 0 && strcmp(buf, "recover\n") != 0)
 957                 return -1;
 958         if (sysfs_set_str(sra, NULL, "sync_action", "frozen") < 0)
 959                 return 0;
 960         return 1;
 961 }
 962
 963 int sysfs_wait(int fd, int *msec)
 964 {
 965         /* Wait up to '*msec' for fd to have an exception condition.
 966          * if msec == NULL, wait indefinitely.
 967          */
 968         fd_set fds;
 969         int n;
 970         FD_ZERO(&fds);
 971         FD_SET(fd, &fds);
 972         if (msec == NULL)
 973                 n = select(fd+1, NULL, NULL, &fds, NULL);
 974         else if (*msec < 0)
 975                 n = 0;
 976         else {
 977                 struct timeval start, end, tv;
 978                 gettimeofday(&start, NULL);
 979                 if (*msec < 1000) {
 980                         tv.tv_sec = 0;
 981                         tv.tv_usec = (*msec)*1000;
 982                 } else {
 983                         tv.tv_sec = (*msec)/1000;
 984                         tv.tv_usec = 0;
 985                 }
 986                 n = select(fd+1, NULL, NULL, &fds, &tv);
 987                 gettimeofday(&end, NULL);
 988                 end.tv_sec -= start.tv_sec;
 989                 *msec -= (end.tv_sec * 1000 + end.tv_usec/1000
 990                           - start.tv_usec/1000) + 1;
 991         }
 992         return n;
 993 }