util.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  */
  24
  25 #include        "mdadm.h"
  26 #include        "md_p.h"
  27 #include        <sys/socket.h>
  28 #include        <sys/utsname.h>
  29 #include        <sys/wait.h>
  30 #include        <sys/un.h>
  31 #include        <ctype.h>
  32 #include        <dirent.h>
  33 #include        <signal.h>
  34
  35 /*
  36  * following taken from linux/blkpg.h because they aren't
  37  * anywhere else and it isn't safe to #include linux/ * stuff.
  38  */
  39
  40 #define BLKPG      _IO(0x12,105)
  41
  42 /* The argument structure */
  43 struct blkpg_ioctl_arg {
  44         int op;
  45         int flags;
  46         int datalen;
  47         void *data;
  48 };
  49
  50 /* The subfunctions (for the op field) */
  51 #define BLKPG_ADD_PARTITION     1
  52 #define BLKPG_DEL_PARTITION     2
  53
  54 /* Sizes of name fields. Unused at present. */
  55 #define BLKPG_DEVNAMELTH        64
  56 #define BLKPG_VOLNAMELTH        64
  57
  58 /* The data structure for ADD_PARTITION and DEL_PARTITION */
  59 struct blkpg_partition {
  60         long long start;                /* starting offset in bytes */
  61         long long length;               /* length in bytes */
  62         int pno;                        /* partition number */
  63         char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
  64                                            to be used in kernel messages */
  65         char volname[BLKPG_VOLNAMELTH]; /* volume label */
  66 };
  67
  68 /*
  69  * Parse a 128 bit uuid in 4 integers
  70  * format is 32 hexx nibbles with options :.<space> separator
  71  * If not exactly 32 hex digits are found, return 0
  72  * else return 1
  73  */
  74 int parse_uuid(char *str, int uuid[4])
  75 {
  76         int hit = 0; /* number of Hex digIT */
  77         int i;
  78         char c;
  79         for (i=0; i<4; i++) uuid[i]=0;
  80
  81         while ((c= *str++)) {
  82                 int n;
  83                 if (c>='0' && c<='9')
  84                         n = c-'0';
  85                 else if (c>='a' && c <= 'f')
  86                         n = 10 + c - 'a';
  87                 else if (c>='A' && c <= 'F')
  88                         n = 10 + c - 'A';
  89                 else if (strchr(":. -", c))
  90                         continue;
  91                 else return 0;
  92
  93                 if (hit<32) {
  94                         uuid[hit/8] <<= 4;
  95                         uuid[hit/8] += n;
  96                 }
  97                 hit++;
  98         }
  99         if (hit == 32)
 100                 return 1;
 101         return 0;
 102 }
 103
 104
 105 /*
 106  * Get the md version number.
 107  * We use the RAID_VERSION ioctl if it is supported
 108  * If not, but we have a block device with major '9', we assume
 109  * 0.36.0
 110  *
 111  * Return version number as 24 but number - assume version parts
 112  * always < 255
 113  */
 114
 115 int md_get_version(int fd)
 116 {
 117     struct stat stb;
 118     mdu_version_t vers;
 119
 120     if (fstat(fd, &stb)<0)
 121         return -1;
 122     if ((S_IFMT&stb.st_mode) != S_IFBLK)
 123         return -1;
 124
 125     if (ioctl(fd, RAID_VERSION, &vers) == 0)
 126         return  (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
 127     if (errno == EACCES)
 128             return -1;
 129     if (major(stb.st_rdev) == MD_MAJOR)
 130         return (3600);
 131     return -1;
 132 }
 133
 134 int get_linux_version()
 135 {
 136         struct utsname name;
 137         char *cp;
 138         int a,b,c;
 139         if (uname(&name) <0)
 140                 return -1;
 141
 142         cp = name.release;
 143         a = strtoul(cp, &cp, 10);
 144         if (*cp != '.') return -1;
 145         b = strtoul(cp+1, &cp, 10);
 146         if (*cp != '.') return -1;
 147         c = strtoul(cp+1, NULL, 10);
 148
 149         return (a*1000000)+(b*1000)+c;
 150 }
 151
 152 void remove_partitions(int fd)
 153 {
 154         /* remove partitions from this block devices.
 155          * This is used for components added to an array
 156          */
 157 #ifdef BLKPG_DEL_PARTITION
 158         struct blkpg_ioctl_arg a;
 159         struct blkpg_partition p;
 160
 161         a.op = BLKPG_DEL_PARTITION;
 162         a.data = (void*)&p;
 163         a.datalen = sizeof(p);
 164         a.flags = 0;
 165         memset(a.data, 0, a.datalen);
 166         for (p.pno=0; p.pno < 16; p.pno++)
 167                 ioctl(fd, BLKPG, &a);
 168 #endif
 169 }
 170
 171 int enough(int level, int raid_disks, int layout, int clean,
 172            char *avail, int avail_disks)
 173 {
 174         int copies, first;
 175         switch (level) {
 176         case 10:
 177                 /* This is the tricky one - we need to check
 178                  * which actual disks are present.
 179                  */
 180                 copies = (layout&255)* ((layout>>8) & 255);
 181                 first=0;
 182                 do {
 183                         /* there must be one of the 'copies' form 'first' */
 184                         int n = copies;
 185                         int cnt=0;
 186                         while (n--) {
 187                                 if (avail[first])
 188                                         cnt++;
 189                                 first = (first+1) % raid_disks;
 190                         }
 191                         if (cnt == 0)
 192                                 return 0;
 193
 194                 } while (first != 0);
 195                 return 1;
 196
 197         case -4:
 198                 return avail_disks>= 1;
 199         case -1:
 200         case 0:
 201                 return avail_disks == raid_disks;
 202         case 1:
 203                 return avail_disks >= 1;
 204         case 4:
 205         case 5:
 206                 if (clean)
 207                         return avail_disks >= raid_disks-1;
 208                 else
 209                         return avail_disks >= raid_disks;
 210         case 6:
 211                 if (clean)
 212                         return avail_disks >= raid_disks-2;
 213                 else
 214                         return avail_disks >= raid_disks;
 215         default:
 216                 return 0;
 217         }
 218 }
 219
 220 const int uuid_match_any[4] = { ~0, ~0, ~0, ~0 };
 221 int same_uuid(int a[4], int b[4], int swapuuid)
 222 {
 223         if (memcmp(a, uuid_match_any, sizeof(int[4])) == 0 ||
 224             memcmp(b, uuid_match_any, sizeof(int[4])) == 0)
 225                 return 1;
 226
 227         if (swapuuid) {
 228                 /* parse uuids are hostendian.
 229                  * uuid's from some superblocks are big-ending
 230                  * if there is a difference, we need to swap..
 231                  */
 232                 unsigned char *ac = (unsigned char *)a;
 233                 unsigned char *bc = (unsigned char *)b;
 234                 int i;
 235                 for (i=0; i<16; i+= 4) {
 236                         if (ac[i+0] != bc[i+3] ||
 237                             ac[i+1] != bc[i+2] ||
 238                             ac[i+2] != bc[i+1] ||
 239                             ac[i+3] != bc[i+0])
 240                                 return 0;
 241                 }
 242                 return 1;
 243         } else {
 244                 if (a[0]==b[0] &&
 245                     a[1]==b[1] &&
 246                     a[2]==b[2] &&
 247                     a[3]==b[3])
 248                         return 1;
 249                 return 0;
 250         }
 251 }
 252 void copy_uuid(void *a, int b[4], int swapuuid)
 253 {
 254         if (swapuuid) {
 255                 /* parse uuids are hostendian.
 256                  * uuid's from some superblocks are big-ending
 257                  * if there is a difference, we need to swap..
 258                  */
 259                 unsigned char *ac = (unsigned char *)a;
 260                 unsigned char *bc = (unsigned char *)b;
 261                 int i;
 262                 for (i=0; i<16; i+= 4) {
 263                         ac[i+0] = bc[i+3];
 264                         ac[i+1] = bc[i+2];
 265                         ac[i+2] = bc[i+1];
 266                         ac[i+3] = bc[i+0];
 267                 }
 268         } else
 269                 memcpy(a, b, 16);
 270 }
 271
 272 char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
 273 {
 274         int i, j;
 275         char uuid[16];
 276         char *c = buf;
 277         strcpy(c, "UUID-");
 278         c += strlen(c);
 279         copy_uuid(uuid, id, swap);
 280         for (i = 0; i < 4; i++) {
 281                 if (i)
 282                         *c++ = sep;
 283                 for (j = 3; j >= 0; j--) {
 284                         sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
 285                         c+= 2;
 286                 }
 287         }
 288         return buf;
 289
 290 }
 291
 292 char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
 293 {
 294         return __fname_from_uuid(info->uuid, st->ss->swapuuid, buf, sep);
 295 }
 296
 297 #ifndef MDASSEMBLE
 298 int check_ext2(int fd, char *name)
 299 {
 300         /*
 301          * Check for an ext2fs file system.
 302          * Superblock is always 1K at 1K offset
 303          *
 304          * s_magic is le16 at 56 == 0xEF53
 305          * report mtime - le32 at 44
 306          * blocks - le32 at 4
 307          * logblksize - le32 at 24
 308          */
 309         unsigned char sb[1024];
 310         time_t mtime;
 311         int size, bsize;
 312         if (lseek(fd, 1024,0)!= 1024)
 313                 return 0;
 314         if (read(fd, sb, 1024)!= 1024)
 315                 return 0;
 316         if (sb[56] != 0x53 || sb[57] != 0xef)
 317                 return 0;
 318
 319         mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
 320         bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
 321         size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
 322         fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n",
 323                 name);
 324         fprintf(stderr,"    size=%dK  mtime=%s",
 325                 size*(1<<bsize), ctime(&mtime));
 326         return 1;
 327 }
 328
 329 int check_reiser(int fd, char *name)
 330 {
 331         /*
 332          * superblock is at 64K
 333          * size is 1024;
 334          * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
 335          *
 336          */
 337         unsigned char sb[1024];
 338         unsigned long size;
 339         if (lseek(fd, 64*1024, 0) != 64*1024)
 340                 return 0;
 341         if (read(fd, sb, 1024) != 1024)
 342                 return 0;
 343         if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
 344             strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
 345                 return 0;
 346         fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
 347         size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
 348         fprintf(stderr, "    size = %luK\n", size*4);
 349
 350         return 1;
 351 }
 352
 353 int check_raid(int fd, char *name)
 354 {
 355         struct mdinfo info;
 356         time_t crtime;
 357         char *level;
 358         struct supertype *st = guess_super(fd);
 359
 360         if (!st) return 0;
 361         st->ss->load_super(st, fd, name);
 362         /* Looks like a raid array .. */
 363         fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
 364                 name);
 365         st->ss->getinfo_super(st, &info);
 366         st->ss->free_super(st);
 367         crtime = info.array.ctime;
 368         level = map_num(pers, info.array.level);
 369         if (!level) level = "-unknown-";
 370         fprintf(stderr, "    level=%s devices=%d ctime=%s",
 371                 level, info.array.raid_disks, ctime(&crtime));
 372         return 1;
 373 }
 374
 375 int ask(char *mesg)
 376 {
 377         char *add = "";
 378         int i;
 379         for (i=0; i<5; i++) {
 380                 char buf[100];
 381                 fprintf(stderr, "%s%s", mesg, add);
 382                 fflush(stderr);
 383                 if (fgets(buf, 100, stdin)==NULL)
 384                         return 0;
 385                 if (buf[0]=='y' || buf[0]=='Y')
 386                         return 1;
 387                 if (buf[0]=='n' || buf[0]=='N')
 388                         return 0;
 389                 add = "(y/n) ";
 390         }
 391         fprintf(stderr, Name ": assuming 'no'\n");
 392         return 0;
 393 }
 394 #endif /* MDASSEMBLE */
 395
 396 char *map_num(mapping_t *map, int num)
 397 {
 398         while (map->name) {
 399                 if (map->num == num)
 400                         return map->name;
 401                 map++;
 402         }
 403         return NULL;
 404 }
 405
 406 int map_name(mapping_t *map, char *name)
 407 {
 408         while (map->name) {
 409                 if (strcmp(map->name, name)==0)
 410                         return map->num;
 411                 map++;
 412         }
 413         return UnSet;
 414 }
 415
 416
 417 int is_standard(char *dev, int *nump)
 418 {
 419         /* tests if dev is a "standard" md dev name.
 420          * i.e if the last component is "/dNN" or "/mdNN",
 421          * where NN is a string of digits
 422          * Returns 1 if a partitionable standard,
 423          *   -1 if non-partitonable,
 424          *   0 if not a standard name.
 425          */
 426         char *d = strrchr(dev, '/');
 427         int type=0;
 428         int num;
 429         if (!d)
 430                 return 0;
 431         if (strncmp(d, "/d",2)==0)
 432                 d += 2, type=1; /* /dev/md/dN{pM} */
 433         else if (strncmp(d, "/md_d", 5)==0)
 434                 d += 5, type=1; /* /dev/md_dN{pM} */
 435         else if (strncmp(d, "/md", 3)==0)
 436                 d += 3, type=-1; /* /dev/mdN */
 437         else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
 438                 d += 1, type=-1; /* /dev/md/N */
 439         else
 440                 return 0;
 441         if (!*d)
 442                 return 0;
 443         num = atoi(d);
 444         while (isdigit(*d))
 445                 d++;
 446         if (*d)
 447                 return 0;
 448         if (nump) *nump = num;
 449
 450         return type;
 451 }
 452
 453
 454 /*
 455  * convert a major/minor pair for a block device into a name in /dev, if possible.
 456  * On the first call, walk /dev collecting name.
 457  * Put them in a simple linked listfor now.
 458  */
 459 struct devmap {
 460     int major, minor;
 461     char *name;
 462     struct devmap *next;
 463 } *devlist = NULL;
 464 int devlist_ready = 0;
 465
 466 int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
 467 {
 468         struct stat st;
 469
 470         if (S_ISLNK(stb->st_mode)) {
 471                 if (stat(name, &st) != 0)
 472                         return 0;
 473                 stb = &st;
 474         }
 475
 476         if ((stb->st_mode&S_IFMT)== S_IFBLK) {
 477                 char *n = strdup(name);
 478                 struct devmap *dm = malloc(sizeof(*dm));
 479                 if (strncmp(n, "/dev/./", 7)==0)
 480                         strcpy(n+4, name+6);
 481                 if (dm) {
 482                         dm->major = major(stb->st_rdev);
 483                         dm->minor = minor(stb->st_rdev);
 484                         dm->name = n;
 485                         dm->next = devlist;
 486                         devlist = dm;
 487                 }
 488         }
 489         return 0;
 490 }
 491
 492 #ifndef HAVE_NFTW
 493 #ifdef HAVE_FTW
 494 int add_dev_1(const char *name, const struct stat *stb, int flag)
 495 {
 496         return add_dev(name, stb, flag, NULL);
 497 }
 498 int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
 499 {
 500         return ftw(path, add_dev_1, nopenfd);
 501 }
 502 #else
 503 int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
 504 {
 505         return 0;
 506 }
 507 #endif /* HAVE_FTW */
 508 #endif /* HAVE_NFTW */
 509
 510 /*
 511  * Find a block device with the right major/minor number.
 512  * If we find multiple names, choose the shortest.
 513  * If we find a name in /dev/md/, we prefer that.
 514  * This applies only to names for MD devices.
 515  */
 516 char *map_dev(int major, int minor, int create)
 517 {
 518         struct devmap *p;
 519         char *regular = NULL, *preferred=NULL;
 520         int did_check = 0;
 521
 522         if (major == 0 && minor == 0)
 523                         return NULL;
 524
 525  retry:
 526         if (!devlist_ready) {
 527                 char *dev = "/dev";
 528                 struct stat stb;
 529                 while(devlist) {
 530                         struct devmap *d = devlist;
 531                         devlist = d->next;
 532                         free(d->name);
 533                         free(d);
 534                 }
 535                 if (lstat(dev, &stb)==0 &&
 536                     S_ISLNK(stb.st_mode))
 537                         dev = "/dev/.";
 538                 nftw(dev, add_dev, 10, FTW_PHYS);
 539                 devlist_ready=1;
 540                 did_check = 1;
 541         }
 542
 543         for (p=devlist; p; p=p->next)
 544                 if (p->major == major &&
 545                     p->minor == minor) {
 546                         if (strncmp(p->name, "/dev/md/",8) == 0) {
 547                                 if (preferred == NULL ||
 548                                     strlen(p->name) < strlen(preferred))
 549                                         preferred = p->name;
 550                         } else {
 551                                 if (regular == NULL ||
 552                                     strlen(p->name) < strlen(regular))
 553                                         regular = p->name;
 554                         }
 555                 }
 556         if (!regular && !preferred && !did_check) {
 557                 devlist_ready = 0;
 558                 goto retry;
 559         }
 560         if (create && !regular && !preferred) {
 561                 static char buf[30];
 562                 snprintf(buf, sizeof(buf), "%d:%d", major, minor);
 563                 regular = buf;
 564         }
 565
 566         return preferred ? preferred : regular;
 567 }
 568
 569 unsigned long calc_csum(void *super, int bytes)
 570 {
 571         unsigned long long newcsum = 0;
 572         int i;
 573         unsigned int csum;
 574         unsigned int *superc = (unsigned int*) super;
 575
 576         for(i=0; i<bytes/4; i++)
 577                 newcsum+= superc[i];
 578         csum = (newcsum& 0xffffffff) + (newcsum>>32);
 579 #ifdef __alpha__
 580 /* The in-kernel checksum calculation is always 16bit on
 581  * the alpha, though it is 32 bit on i386...
 582  * I wonder what it is elsewhere... (it uses and API in
 583  * a way that it shouldn't).
 584  */
 585         csum = (csum & 0xffff) + (csum >> 16);
 586         csum = (csum & 0xffff) + (csum >> 16);
 587 #endif
 588         return csum;
 589 }
 590
 591 #ifndef MDASSEMBLE
 592 char *human_size(long long bytes)
 593 {
 594         static char buf[30];
 595
 596         /* We convert bytes to either centi-M{ega,ibi}bytes or
 597          * centi-G{igi,ibi}bytes, with appropriate rounding,
 598          * and then print 1/100th of those as a decimal.
 599          * We allow upto 2048Megabytes before converting to
 600          * gigabytes, as that shows more precision and isn't
 601          * too large a number.
 602          * Terrabytes are not yet handled.
 603          */
 604
 605         if (bytes < 5000*1024)
 606                 buf[0]=0;
 607         else if (bytes < 2*1024LL*1024LL*1024LL) {
 608                 long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
 609                 long cMB  = (bytes / ( 1000000LL / 200LL ) +1) /2;
 610                 snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
 611                         cMiB/100 , cMiB % 100,
 612                         cMB/100, cMB % 100);
 613         } else {
 614                 long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
 615                 long cGB  = (bytes / (1000000000LL/200LL ) +1) /2;
 616                 snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
 617                         cGiB/100 , cGiB % 100,
 618                         cGB/100, cGB % 100);
 619         }
 620         return buf;
 621 }
 622
 623 char *human_size_brief(long long bytes)
 624 {
 625         static char buf[30];
 626
 627         if (bytes < 5000*1024)
 628                 snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
 629                         (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024)
 630                         );
 631         else if (bytes < 2*1024LL*1024LL*1024LL)
 632                 snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
 633                         (long)(bytes>>20),
 634                         (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100)
 635                         );
 636         else
 637                 snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
 638                         (long)(bytes>>30),
 639                         (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100)
 640                         );
 641         return buf;
 642 }
 643
 644 void print_r10_layout(int layout)
 645 {
 646         int near = layout & 255;
 647         int far = (layout >> 8) & 255;
 648         int offset = (layout&0x10000);
 649         char *sep = "";
 650
 651         if (near != 1) {
 652                 printf("%s near=%d", sep, near);
 653                 sep = ",";
 654         }
 655         if (far != 1)
 656                 printf("%s %s=%d", sep, offset?"offset":"far", far);
 657         if (near*far == 1)
 658                 printf("NO REDUNDANCY");
 659 }
 660 #endif
 661
 662 unsigned long long calc_array_size(int level, int raid_disks, int layout,
 663                                    int chunksize, unsigned long long devsize)
 664 {
 665         int data_disks = 0;
 666         switch (level) {
 667         case 0: data_disks = raid_disks; break;
 668         case 1: data_disks = 1; break;
 669         case 4:
 670         case 5: data_disks = raid_disks - 1; break;
 671         case 6: data_disks = raid_disks - 2; break;
 672         case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
 673                 break;
 674         }
 675         devsize &= ~(unsigned long long)((chunksize>>9)-1);
 676         return data_disks * devsize;
 677 }
 678
 679 int get_mdp_major(void)
 680 {
 681 static int mdp_major = -1;
 682         FILE *fl;
 683         char *w;
 684         int have_block = 0;
 685         int have_devices = 0;
 686         int last_num = -1;
 687
 688         if (mdp_major != -1)
 689                 return mdp_major;
 690         fl = fopen("/proc/devices", "r");
 691         if (!fl)
 692                 return -1;
 693         while ((w = conf_word(fl, 1))) {
 694                 if (have_block && strcmp(w, "devices:")==0)
 695                         have_devices = 1;
 696                 have_block =  (strcmp(w, "Block")==0);
 697                 if (isdigit(w[0]))
 698                         last_num = atoi(w);
 699                 if (have_devices && strcmp(w, "mdp")==0)
 700                         mdp_major = last_num;
 701                 free(w);
 702         }
 703         fclose(fl);
 704         return mdp_major;
 705 }
 706
 707 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 708 char *get_md_name(int dev)
 709 {
 710         /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
 711         /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
 712         static char devname[50];
 713         struct stat stb;
 714         dev_t rdev;
 715         char *dn;
 716
 717         if (dev < 0) {
 718                 int mdp =  get_mdp_major();
 719                 if (mdp < 0) return NULL;
 720                 rdev = makedev(mdp, (-1-dev)<<6);
 721                 snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev);
 722                 if (stat(devname, &stb) == 0
 723                     && (S_IFMT&stb.st_mode) == S_IFBLK
 724                     && (stb.st_rdev == rdev))
 725                         return devname;
 726         } else {
 727                 rdev = makedev(MD_MAJOR, dev);
 728                 snprintf(devname, sizeof(devname), "/dev/md%d", dev);
 729                 if (stat(devname, &stb) == 0
 730                     && (S_IFMT&stb.st_mode) == S_IFBLK
 731                     && (stb.st_rdev == rdev))
 732                         return devname;
 733
 734                 snprintf(devname, sizeof(devname), "/dev/md/%d", dev);
 735                 if (stat(devname, &stb) == 0
 736                     && (S_IFMT&stb.st_mode) == S_IFBLK
 737                     && (stb.st_rdev == rdev))
 738                         return devname;
 739         }
 740         dn = map_dev(major(rdev), minor(rdev), 0);
 741         if (dn)
 742                 return dn;
 743         snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev);
 744         if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
 745                 if (errno != EEXIST)
 746                         return NULL;
 747
 748         if (stat(devname, &stb) == 0
 749             && (S_IFMT&stb.st_mode) == S_IFBLK
 750             && (stb.st_rdev == rdev))
 751                 return devname;
 752         unlink(devname);
 753         return NULL;
 754 }
 755
 756 void put_md_name(char *name)
 757 {
 758         if (strncmp(name, "/dev/.tmp.md", 12)==0)
 759                 unlink(name);
 760 }
 761
 762 int find_free_devnum(int use_partitions)
 763 {
 764         int devnum;
 765         for (devnum = 127; devnum != 128;
 766              devnum = devnum ? devnum-1 : (1<<20)-1) {
 767                 char *dn;
 768                 int _devnum;
 769
 770                 _devnum = use_partitions ? (-1-devnum) : devnum;
 771                 if (mddev_busy(_devnum))
 772                         continue;
 773                 /* make sure it is new to /dev too, at least as a
 774                  * non-standard */
 775                 dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);
 776                 if (dn && ! is_standard(dn, NULL))
 777                         continue;
 778                 break;
 779         }
 780         if (devnum == 128)
 781                 return NoMdDev;
 782         return use_partitions ? (-1-devnum) : devnum;
 783 }
 784 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
 785
 786 int dev_open(char *dev, int flags)
 787 {
 788         /* like 'open', but if 'dev' matches %d:%d, create a temp
 789          * block device and open that
 790          */
 791         char *e;
 792         int fd = -1;
 793         char devname[32];
 794         int major;
 795         int minor;
 796
 797         if (!dev) return -1;
 798
 799         major = strtoul(dev, &e, 0);
 800         if (e > dev && *e == ':' && e[1] &&
 801             (minor = strtoul(e+1, &e, 0)) >= 0 &&
 802             *e == 0) {
 803                 snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
 804                          (int)getpid(), major, minor);
 805                 if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
 806                         fd = open(devname, flags|O_DIRECT);
 807                         unlink(devname);
 808                 }
 809         } else
 810                 fd = open(dev, flags|O_DIRECT);
 811         return fd;
 812 }
 813
 814 int open_dev(int devnum)
 815 {
 816         char buf[20];
 817
 818         sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
 819         return dev_open(buf, O_RDWR);
 820 }
 821
 822 int open_dev_excl(int devnum)
 823 {
 824         char buf[20];
 825         int i;
 826
 827         sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
 828         for (i=0 ; i<25 ; i++) {
 829                 int fd = dev_open(buf, O_RDWR|O_EXCL);
 830                 if (fd >= 0)
 831                         return fd;
 832                 if (errno != EBUSY)
 833                         return fd;
 834                 usleep(200000);
 835         }
 836         return -1;
 837 }
 838
 839 int same_dev(char *one, char *two)
 840 {
 841         struct stat st1, st2;
 842         if (stat(one, &st1) != 0)
 843                 return 0;
 844         if (stat(two, &st2) != 0)
 845                 return 0;
 846         if ((st1.st_mode & S_IFMT) != S_IFBLK)
 847                 return 0;
 848         if ((st2.st_mode & S_IFMT) != S_IFBLK)
 849                 return 0;
 850         return st1.st_rdev == st2.st_rdev;
 851 }
 852
 853 void wait_for(char *dev, int fd)
 854 {
 855         int i;
 856         struct stat stb_want;
 857
 858         if (fstat(fd, &stb_want) != 0 ||
 859             (stb_want.st_mode & S_IFMT) != S_IFBLK)
 860                 return;
 861
 862         for (i=0 ; i<25 ; i++) {
 863                 struct stat stb;
 864                 if (stat(dev, &stb) == 0 &&
 865                     (stb.st_mode & S_IFMT) == S_IFBLK &&
 866                     (stb.st_rdev == stb_want.st_rdev))
 867                         return;
 868                 usleep(200000);
 869         }
 870         if (i == 25)
 871                 dprintf("%s: timeout waiting for %s\n", __func__, dev);
 872 }
 873
 874 struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
 875
 876 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 877
 878 struct supertype *super_by_fd(int fd)
 879 {
 880         mdu_array_info_t array;
 881         int vers;
 882         int minor;
 883         struct supertype *st = NULL;
 884         struct mdinfo *sra;
 885         char *verstr;
 886         char version[20];
 887         int i;
 888         char *subarray = NULL;
 889
 890         sra = sysfs_read(fd, 0, GET_VERSION);
 891
 892         if (sra) {
 893                 vers = sra->array.major_version;
 894                 minor = sra->array.minor_version;
 895                 verstr = sra->text_version;
 896         } else {
 897                 if (ioctl(fd, GET_ARRAY_INFO, &array))
 898                         array.major_version = array.minor_version = 0;
 899                 vers = array.major_version;
 900                 minor = array.minor_version;
 901                 verstr = "";
 902         }
 903
 904         if (vers != -1) {
 905                 sprintf(version, "%d.%d", vers, minor);
 906                 verstr = version;
 907         }
 908         if (minor == -2 && is_subarray(verstr)) {
 909                 char *dev = verstr+1;
 910                 subarray = strchr(dev, '/');
 911                 int devnum;
 912                 if (subarray)
 913                         *subarray++ = '\0';
 914                 devnum = devname2devnum(dev);
 915                 subarray = strdup(subarray);
 916                 if (sra)
 917                         sysfs_free(sra);
 918                 sra = sysfs_read(-1, devnum, GET_VERSION);
 919                 if (sra && sra->text_version[0])
 920                         verstr = sra->text_version;
 921                 else
 922                         verstr = "-no-metadata-";
 923         }
 924
 925         for (i = 0; st == NULL && superlist[i] ; i++)
 926                 st = superlist[i]->match_metadata_desc(verstr);
 927
 928         if (sra)
 929                 sysfs_free(sra);
 930         if (st) {
 931                 st->sb = NULL;
 932                 if (subarray) {
 933                         strncpy(st->subarray, subarray, 32);
 934                         st->subarray[31] = 0;
 935                         free(subarray);
 936                 } else
 937                         st->subarray[0] = 0;
 938         }
 939         return st;
 940 }
 941 #endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
 942
 943
 944 struct supertype *dup_super(struct supertype *orig)
 945 {
 946         struct supertype *st;
 947
 948         if (!orig)
 949                 return orig;
 950         st = malloc(sizeof(*st));
 951         if (!st)
 952                 return st;
 953         memset(st, 0, sizeof(*st));
 954         st->ss = orig->ss;
 955         st->max_devs = orig->max_devs;
 956         st->minor_version = orig->minor_version;
 957         strcpy(st->subarray, orig->subarray);
 958         st->sb = NULL;
 959         st->info = NULL;
 960         return st;
 961 }
 962
 963 struct supertype *guess_super(int fd)
 964 {
 965         /* try each load_super to find the best match,
 966          * and return the best superswitch
 967          */
 968         struct superswitch  *ss;
 969         struct supertype *st;
 970         unsigned long besttime = 0;
 971         int bestsuper = -1;
 972         int i;
 973
 974         st = malloc(sizeof(*st));
 975         for (i=0 ; superlist[i]; i++) {
 976                 int rv;
 977                 ss = superlist[i];
 978                 memset(st, 0, sizeof(*st));
 979                 rv = ss->load_super(st, fd, NULL);
 980                 if (rv == 0) {
 981                         struct mdinfo info;
 982                         st->ss->getinfo_super(st, &info);
 983                         if (bestsuper == -1 ||
 984                             besttime < info.array.ctime) {
 985                                 bestsuper = i;
 986                                 besttime = info.array.ctime;
 987                         }
 988                         ss->free_super(st);
 989                 }
 990         }
 991         if (bestsuper != -1) {
 992                 int rv;
 993                 memset(st, 0, sizeof(*st));
 994                 rv = superlist[bestsuper]->load_super(st, fd, NULL);
 995                 if (rv == 0) {
 996                         superlist[bestsuper]->free_super(st);
 997                         return st;
 998                 }
 999         }
1000         free(st);
1001         return NULL;
1002 }
1003
1004 /* Return size of device in bytes */
1005 int get_dev_size(int fd, char *dname, unsigned long long *sizep)
1006 {
1007         unsigned long long ldsize;
1008         struct stat st;
1009
1010         if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
1011                 ldsize = (unsigned long long)st.st_size;
1012         else
1013 #ifdef BLKGETSIZE64
1014         if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
1015 #endif
1016         {
1017                 unsigned long dsize;
1018                 if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
1019                         ldsize = dsize;
1020                         ldsize <<= 9;
1021                 } else {
1022                         if (dname)
1023                                 fprintf(stderr, Name ": Cannot get size of %s: %s\b",
1024                                         dname, strerror(errno));
1025                         return 0;
1026                 }
1027         }
1028         *sizep = ldsize;
1029         return 1;
1030 }
1031
1032 void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
1033 {
1034         int d;
1035         ioctl(mdfd, GET_ARRAY_INFO, ainf);
1036         for (d = 0 ; d < ainf->raid_disks + ainf->nr_disks ; d++)
1037                 if (ioctl(mdfd, GET_DISK_INFO, disk) == 0)
1038                         return;
1039 }
1040
1041 int open_container(int fd)
1042 {
1043         /* 'fd' is a block device.  Find out if it is in use
1044          * by a container, and return an open fd on that container.
1045          */
1046         char path[256];
1047         char *e;
1048         DIR *dir;
1049         struct dirent *de;
1050         int dfd, n;
1051         char buf[200];
1052         int major, minor;
1053         struct stat st;
1054
1055         if (fstat(fd, &st) != 0)
1056                 return -1;
1057         sprintf(path, "/sys/dev/block/%d:%d/holders",
1058                 (int)major(st.st_rdev), (int)minor(st.st_rdev));
1059         e = path + strlen(path);
1060
1061         dir = opendir(path);
1062         if (!dir)
1063                 return -1;
1064         while ((de = readdir(dir))) {
1065                 if (de->d_ino == 0)
1066                         continue;
1067                 if (de->d_name[0] == '.')
1068                         continue;
1069                 sprintf(e, "/%s/dev", de->d_name);
1070                 dfd = open(path, O_RDONLY);
1071                 if (dfd < 0)
1072                         continue;
1073                 n = read(dfd, buf, sizeof(buf));
1074                 close(dfd);
1075                 if (n <= 0 || n >= sizeof(buf))
1076                         continue;
1077                 buf[n] = 0;
1078                 if (sscanf(buf, "%d:%d", &major, &minor) != 2)
1079                         continue;
1080                 sprintf(buf, "%d:%d", major, minor);
1081                 dfd = dev_open(buf, O_RDONLY);
1082                 if (dfd >= 0) {
1083                         closedir(dir);
1084                         return dfd;
1085                 }
1086         }
1087         closedir(dir);
1088         return -1;
1089 }
1090
1091 int add_disk(int mdfd, struct supertype *st,
1092              struct mdinfo *sra, struct mdinfo *info)
1093 {
1094         /* Add a device to an array, in one of 2 ways. */
1095         int rv;
1096 #ifndef MDASSEMBLE
1097         if (st->ss->external) {
1098                 rv = sysfs_add_disk(sra, info,
1099                                     info->disk.state & (1<<MD_DISK_SYNC));
1100                 if (! rv) {
1101                         struct mdinfo *sd2;
1102                         for (sd2 = sra->devs; sd2; sd2=sd2->next)
1103                                 if (sd2 == info)
1104                                         break;
1105                         if (sd2 == NULL) {
1106                                 sd2 = malloc(sizeof(*sd2));
1107                                 *sd2 = *info;
1108                                 sd2->next = sra->devs;
1109                                 sra->devs = sd2;
1110                         }
1111                 }
1112         } else
1113 #endif
1114                 rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
1115         return rv;
1116 }
1117
1118 int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
1119 {
1120         /* Initialise kernel's knowledge of array.
1121          * This varies between externally managed arrays
1122          * and older kernels
1123          */
1124         int vers = md_get_version(mdfd);
1125         int rv;
1126
1127 #ifndef MDASSEMBLE
1128         if (st->ss->external)
1129                 rv = sysfs_set_array(info, vers);
1130         else
1131 #endif
1132                 if ((vers % 100) >= 1) { /* can use different versions */
1133                 mdu_array_info_t inf;
1134                 memset(&inf, 0, sizeof(inf));
1135                 inf.major_version = info->array.major_version;
1136                 inf.minor_version = info->array.minor_version;
1137                 rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
1138         } else
1139                 rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
1140         return rv;
1141 }
1142
1143 char *devnum2devname(int num)
1144 {
1145         char name[100];
1146         if (num > 0)
1147                 sprintf(name, "md%d", num);
1148         else
1149                 sprintf(name, "md_d%d", -1-num);
1150         return strdup(name);
1151 }
1152
1153 int devname2devnum(char *name)
1154 {
1155         char *ep;
1156         int num;
1157         if (strncmp(name, "md_d", 4)==0)
1158                 num = -1-strtoul(name+4, &ep, 10);
1159         else
1160                 num = strtoul(name+2, &ep, 10);
1161         return num;
1162 }
1163
1164 int stat2devnum(struct stat *st)
1165 {
1166         char path[30];
1167         char link[200];
1168         char *cp;
1169         int n;
1170
1171         if ((S_IFMT & st->st_mode) == S_IFBLK) {
1172                 if (major(st->st_rdev) == MD_MAJOR)
1173                         return minor(st->st_rdev);
1174                 else if (major(st->st_rdev) == get_mdp_major())
1175                         return -1- (minor(st->st_rdev)>>MdpMinorShift);
1176
1177                 /* must be an extended-minor partition. Look at the
1178                  * /sys/dev/block/%d:%d link which must look like
1179                  * ../../block/mdXXX/mdXXXpYY
1180                  */
1181                 sprintf(path, "/sys/dev/block/%d:%d", major(st->st_rdev),
1182                         minor(st->st_rdev));
1183                 n = readlink(path, link, sizeof(link)-1);
1184                 if (n <= 0)
1185                         return NoMdDev;
1186                 link[n] = 0;
1187                 cp = strrchr(link, '/');
1188                 if (cp) *cp = 0;
1189                 cp = strchr(link, '/');
1190                 if (cp && strncmp(cp, "/md", 3) == 0)
1191                         return devname2devnum(cp+1);
1192         }
1193         return NoMdDev;
1194
1195 }
1196
1197 int fd2devnum(int fd)
1198 {
1199         struct stat stb;
1200         if (fstat(fd, &stb) == 0)
1201                 return stat2devnum(&stb);
1202         return NoMdDev;
1203 }
1204
1205 int mdmon_running(int devnum)
1206 {
1207         char path[100];
1208         char pid[10];
1209         int fd;
1210         int n;
1211         sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
1212         fd = open(path, O_RDONLY, 0);
1213
1214         if (fd < 0)
1215                 return 0;
1216         n = read(fd, pid, 9);
1217         close(fd);
1218         if (n <= 0)
1219                 return 0;
1220         if (kill(atoi(pid), 0) == 0)
1221                 return 1;
1222         return 0;
1223 }
1224
1225 int signal_mdmon(int devnum)
1226 {
1227         char path[100];
1228         char pid[10];
1229         int fd;
1230         int n;
1231         sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
1232         fd = open(path, O_RDONLY, 0);
1233
1234         if (fd < 0)
1235                 return 0;
1236         n = read(fd, pid, 9);
1237         close(fd);
1238         if (n <= 0)
1239                 return 0;
1240         if (kill(atoi(pid), SIGUSR1) == 0)
1241                 return 1;
1242         return 0;
1243 }
1244
1245 int start_mdmon(int devnum)
1246 {
1247         int i;
1248         int len;
1249         pid_t pid;
1250         int status;
1251         char pathbuf[1024];
1252         char *paths[4] = {
1253                 pathbuf,
1254                 "/sbin/mdmon",
1255                 "mdmon",
1256                 NULL
1257         };
1258
1259         if (check_env("MDADM_NO_MDMON"))
1260                 return 0;
1261
1262         len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf));
1263         if (len > 0) {
1264                 char *sl;
1265                 pathbuf[len] = 0;
1266                 sl = strrchr(pathbuf, '/');
1267                 if (sl)
1268                         sl++;
1269                 else
1270                         sl = pathbuf;
1271                 strcpy(sl, "mdmon");
1272         } else
1273                 pathbuf[0] = '\0';
1274
1275         switch(fork()) {
1276         case 0:
1277                 /* FIXME yuk. CLOSE_EXEC?? */
1278                 for (i=3; i < 100; i++)
1279                         close(i);
1280                 for (i=0; paths[i]; i++)
1281                         if (paths[i][0])
1282                                 execl(paths[i], "mdmon",
1283                                       devnum2devname(devnum),
1284                                       NULL);
1285                 exit(1);
1286         case -1: fprintf(stderr, Name ": cannot run mdmon. "
1287                          "Array remains readonly\n");
1288                 return -1;
1289         default: /* parent - good */
1290                 pid = wait(&status);
1291                 if (pid < 0 || status != 0)
1292                         return -1;
1293         }
1294         return 0;
1295 }
1296
1297 int check_env(char *name)
1298 {
1299         char *val = getenv(name);
1300
1301         if (val && atoi(val) == 1)
1302                 return 1;
1303
1304         return 0;
1305 }
1306
1307 __u32 random32(void)
1308 {
1309         __u32 rv;
1310         int rfd = open("/dev/urandom", O_RDONLY);
1311         if (rfd < 0 || read(rfd, &rv, 4) != 4)
1312                 rv = random();
1313         if (rfd >= 0)
1314                 close(rfd);
1315         return rv;
1316 }
1317
1318 #ifndef MDASSEMBLE
1319 int flush_metadata_updates(struct supertype *st)
1320 {
1321         int sfd;
1322         if (!st->updates) {
1323                 st->update_tail = NULL;
1324                 return -1;
1325         }
1326
1327         sfd = connect_monitor(devnum2devname(st->container_dev));
1328         if (sfd < 0)
1329                 return -1;
1330
1331         while (st->updates) {
1332                 struct metadata_update *mu = st->updates;
1333                 st->updates = mu->next;
1334
1335                 send_message(sfd, mu, 0);
1336                 wait_reply(sfd, 0);
1337                 free(mu->buf);
1338                 free(mu);
1339         }
1340         ack(sfd, 0);
1341         wait_reply(sfd, 0);
1342         close(sfd);
1343         st->update_tail = NULL;
1344         return 0;
1345 }
1346
1347 void append_metadata_update(struct supertype *st, void *buf, int len)
1348 {
1349
1350         struct metadata_update *mu = malloc(sizeof(*mu));
1351
1352         mu->buf = buf;
1353         mu->len = len;
1354         mu->space = NULL;
1355         mu->next = NULL;
1356         *st->update_tail = mu;
1357         st->update_tail = &mu->next;
1358 }
1359 #endif /* MDASSEMBLE */
1360
1361 #ifdef __TINYC__
1362 /* tinyc doesn't optimize this check in ioctl.h out ... */
1363 unsigned int __invalid_size_argument_for_IOC = 0;
1364 #endif
1365