usr.sbin/makefs/walk.c

   1 /*      $NetBSD: walk.c,v 1.24 2008/12/28 21:51:46 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Luke Mewburn for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38
  39 #include <sys/cdefs.h>
  40 __FBSDID("$FreeBSD$");
  41
  42 #include <sys/param.h>
  43
  44 #include <assert.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <stdio.h>
  48 #include <dirent.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <sys/stat.h>
  53
  54 #include "makefs.h"
  55 #include "mtree.h"
  56 #include "extern.h"
  57
  58 static  void     apply_specdir(const char *, NODE *, fsnode *, int);
  59 static  void     apply_specentry(const char *, NODE *, fsnode *);
  60 static  fsnode  *create_fsnode(const char *, const char *, const char *,
  61                                struct stat *);
  62 static  fsinode *link_check(fsinode *);
  63
  64
  65 /*
  66  * walk_dir --
  67  *      build a tree of fsnodes from `root' and `dir', with a parent
  68  *      fsnode of `parent' (which may be NULL for the root of the tree).
  69  *      append the tree to a fsnode of `join' if it is not NULL.
  70  *      each "level" is a directory, with the "." entry guaranteed to be
  71  *      at the start of the list, and without ".." entries.
  72  */
  73 fsnode *
  74 walk_dir(const char *root, const char *dir, fsnode *parent, fsnode *join)
  75 {
  76         fsnode          *first, *cur, *prev, *last;
  77         DIR             *dirp;
  78         struct dirent   *dent;
  79         char            path[MAXPATHLEN + 1];
  80         struct stat     stbuf;
  81         char            *name, *rp;
  82         int             dot, len;
  83
  84         assert(root != NULL);
  85         assert(dir != NULL);
  86
  87         len = snprintf(path, sizeof(path), "%s/%s", root, dir);
  88         if (len >= (int)sizeof(path))
  89                 errx(1, "Pathname too long.");
  90         if (debug & DEBUG_WALK_DIR)
  91                 printf("walk_dir: %s %p\n", path, parent);
  92         if ((dirp = opendir(path)) == NULL)
  93                 err(1, "Can't opendir `%s'", path);
  94         rp = path + strlen(root) + 1;
  95         if (join != NULL) {
  96                 first = cur = join;
  97                 while (cur->next != NULL)
  98                         cur = cur->next;
  99                 prev = cur;
 100         } else
 101                 first = prev = NULL;
 102         last = prev;
 103         while ((dent = readdir(dirp)) != NULL) {
 104                 name = dent->d_name;
 105                 dot = 0;
 106                 if (name[0] == '.')
 107                         switch (name[1]) {
 108                         case '\0':      /* "." */
 109                                 if (join != NULL)
 110                                         continue;
 111                                 dot = 1;
 112                                 break;
 113                         case '.':       /* ".." */
 114                                 if (name[2] == '\0')
 115                                         continue;
 116                                 /* FALLTHROUGH */
 117                         default:
 118                                 dot = 0;
 119                         }
 120                 if (debug & DEBUG_WALK_DIR_NODE)
 121                         printf("scanning %s/%s/%s\n", root, dir, name);
 122                 if (snprintf(path + len, sizeof(path) - len, "/%s", name) >=
 123                     (int)sizeof(path) - len)
 124                         errx(1, "Pathname too long.");
 125                 if (lstat(path, &stbuf) == -1)
 126                         err(1, "Can't lstat `%s'", path);
 127 #ifdef S_ISSOCK
 128                 if (S_ISSOCK(stbuf.st_mode & S_IFMT)) {
 129                         if (debug & DEBUG_WALK_DIR_NODE)
 130                                 printf("  skipping socket %s\n", path);
 131                         continue;
 132                 }
 133 #endif
 134
 135                 if (join != NULL) {
 136                         cur = join->next;
 137                         for (;;) {
 138                                 if (cur == NULL || strcmp(cur->name, name) == 0)
 139                                         break;
 140                                 if (cur == last) {
 141                                         cur = NULL;
 142                                         break;
 143                                 }
 144                                 cur = cur->next;
 145                         }
 146                         if (cur != NULL) {
 147                                 if (S_ISDIR(cur->type) &&
 148                                     S_ISDIR(stbuf.st_mode)) {
 149                                         if (debug & DEBUG_WALK_DIR_NODE)
 150                                                 printf("merging %s with %p\n",
 151                                                     path, cur->child);
 152                                         cur->child = walk_dir(root, rp, cur,
 153                                             cur->child);
 154                                         continue;
 155                                 }
 156                                 errx(1, "Can't merge %s `%s' with existing %s",
 157                                     inode_type(stbuf.st_mode), path,
 158                                     inode_type(cur->type));
 159                         }
 160                 }
 161
 162                 cur = create_fsnode(root, dir, name, &stbuf);
 163                 cur->parent = parent;
 164                 if (dot) {
 165                                 /* ensure "." is at the start of the list */
 166                         cur->next = first;
 167                         first = cur;
 168                         if (! prev)
 169                                 prev = cur;
 170                         cur->first = first;
 171                 } else {                        /* not "." */
 172                         if (prev)
 173                                 prev->next = cur;
 174                         prev = cur;
 175                         if (!first)
 176                                 first = cur;
 177                         cur->first = first;
 178                         if (S_ISDIR(cur->type)) {
 179                                 cur->child = walk_dir(root, rp, cur, NULL);
 180                                 continue;
 181                         }
 182                 }
 183                 if (stbuf.st_nlink > 1) {
 184                         fsinode *curino;
 185
 186                         curino = link_check(cur->inode);
 187                         if (curino != NULL) {
 188                                 free(cur->inode);
 189                                 cur->inode = curino;
 190                                 cur->inode->nlink++;
 191                                 if (debug & DEBUG_WALK_DIR_LINKCHECK)
 192                                         printf("link_check: found [%llu, %llu]\n",
 193                                             (unsigned long long)curino->st.st_dev,
 194                                             (unsigned long long)curino->st.st_ino);
 195                         }
 196                 }
 197                 if (S_ISLNK(cur->type)) {
 198                         char    slink[PATH_MAX+1];
 199                         int     llen;
 200
 201                         llen = readlink(path, slink, sizeof(slink) - 1);
 202                         if (llen == -1)
 203                                 err(1, "Readlink `%s'", path);
 204                         slink[llen] = '\0';
 205                         if ((cur->symlink = strdup(slink)) == NULL)
 206                                 err(1, "Memory allocation error");
 207                 }
 208         }
 209         assert(first != NULL);
 210         if (join == NULL)
 211                 for (cur = first->next; cur != NULL; cur = cur->next)
 212                         cur->first = first;
 213         if (closedir(dirp) == -1)
 214                 err(1, "Can't closedir `%s/%s'", root, dir);
 215         return (first);
 216 }
 217
 218 static fsnode *
 219 create_fsnode(const char *root, const char *path, const char *name,
 220     struct stat *stbuf)
 221 {
 222         fsnode *cur;
 223
 224         if ((cur = calloc(1, sizeof(fsnode))) == NULL ||
 225             (cur->path = strdup(path)) == NULL ||
 226             (cur->name = strdup(name)) == NULL ||
 227             (cur->inode = calloc(1, sizeof(fsinode))) == NULL)
 228                 err(1, "Memory allocation error");
 229         cur->root = root;
 230         cur->type = stbuf->st_mode & S_IFMT;
 231         cur->inode->nlink = 1;
 232         cur->inode->st = *stbuf;
 233         return (cur);
 234 }
 235
 236 /*
 237  * free_fsnodes --
 238  *      Removes node from tree and frees it and all of
 239  *   its decendents.
 240  */
 241 void
 242 free_fsnodes(fsnode *node)
 243 {
 244         fsnode  *cur, *next;
 245
 246         assert(node != NULL);
 247
 248         /* for ".", start with actual parent node */
 249         if (node->first == node) {
 250                 assert(node->name[0] == '.' && node->name[1] == '\0');
 251                 if (node->parent) {
 252                         assert(node->parent->child == node);
 253                         node = node->parent;
 254                 }
 255         }
 256
 257         /* Find ourselves in our sibling list and unlink */
 258         if (node->first != node) {
 259                 for (cur = node->first; cur->next; cur = cur->next) {
 260                         if (cur->next == node) {
 261                                 cur->next = node->next;
 262                                 node->next = NULL;
 263                                 break;
 264                         }
 265                 }
 266         }
 267
 268         for (cur = node; cur != NULL; cur = next) {
 269                 next = cur->next;
 270                 if (cur->child) {
 271                         cur->child->parent = NULL;
 272                         free_fsnodes(cur->child);
 273                 }
 274                 if (cur->inode->nlink-- == 1)
 275                         free(cur->inode);
 276                 if (cur->symlink)
 277                         free(cur->symlink);
 278                 free(cur->path);
 279                 free(cur->name);
 280                 free(cur);
 281         }
 282 }
 283
 284 /*
 285  * apply_specfile --
 286  *      read in the mtree(8) specfile, and apply it to the tree
 287  *      at dir,parent. parameters in parent on equivalent types
 288  *      will be changed to those found in specfile, and missing
 289  *      entries will be added.
 290  */
 291 void
 292 apply_specfile(const char *specfile, const char *dir, fsnode *parent, int speconly)
 293 {
 294         struct timeval   start;
 295         FILE    *fp;
 296         NODE    *root;
 297
 298         assert(specfile != NULL);
 299         assert(parent != NULL);
 300
 301         if (debug & DEBUG_APPLY_SPECFILE)
 302                 printf("apply_specfile: %s, %s %p\n", specfile, dir, parent);
 303
 304                                 /* read in the specfile */
 305         if ((fp = fopen(specfile, "r")) == NULL)
 306                 err(1, "Can't open `%s'", specfile);
 307         TIMER_START(start);
 308         root = mtree_readspec(fp);
 309         TIMER_RESULTS(start, "spec");
 310         if (fclose(fp) == EOF)
 311                 err(1, "Can't close `%s'", specfile);
 312
 313                                 /* perform some sanity checks */
 314         if (root == NULL)
 315                 errx(1, "Specfile `%s' did not contain a tree", specfile);
 316         assert(strcmp(root->name, ".") == 0);
 317         assert(root->type == F_DIR);
 318
 319                                 /* merge in the changes */
 320         apply_specdir(dir, root, parent, speconly);
 321
 322 }
 323
 324 static u_int
 325 nodetoino(u_int type)
 326 {
 327
 328         switch (type) {
 329         case F_BLOCK:
 330                 return S_IFBLK;
 331         case F_CHAR:
 332                 return S_IFCHR;
 333         case F_DIR:
 334                 return S_IFDIR;
 335         case F_FIFO:
 336                 return S_IFIFO;
 337         case F_FILE:
 338                 return S_IFREG;
 339         case F_LINK:
 340                 return S_IFLNK;
 341         case F_SOCK:
 342                 return S_IFSOCK;
 343         default:
 344                 printf("unknown type %d", type);
 345                 abort();
 346         }
 347         /* NOTREACHED */
 348 }
 349
 350
 351 static void
 352 apply_specdir(const char *dir, NODE *specnode, fsnode *dirnode, int speconly)
 353 {
 354         char     path[MAXPATHLEN + 1];
 355         NODE    *curnode;
 356         fsnode  *curfsnode;
 357
 358         assert(specnode != NULL);
 359         assert(dirnode != NULL);
 360
 361         if (debug & DEBUG_APPLY_SPECFILE)
 362                 printf("apply_specdir: %s %p %p\n", dir, specnode, dirnode);
 363
 364         if (specnode->type != F_DIR)
 365                 errx(1, "Specfile node `%s/%s' is not a directory",
 366                     dir, specnode->name);
 367         if (dirnode->type != S_IFDIR)
 368                 errx(1, "Directory node `%s/%s' is not a directory",
 369                     dir, dirnode->name);
 370
 371         apply_specentry(dir, specnode, dirnode);
 372
 373         /* Remove any filesystem nodes not found in specfile */
 374         /* XXX inefficient.  This is O^2 in each dir and it would
 375          * have been better never to have walked this part of the tree
 376          * to begin with
 377          */
 378         if (speconly) {
 379                 fsnode *next;
 380                 assert(dirnode->name[0] == '.' && dirnode->name[1] == '\0');
 381                 for (curfsnode = dirnode->next; curfsnode != NULL; curfsnode = next) {
 382                         next = curfsnode->next;
 383                         for (curnode = specnode->child; curnode != NULL;
 384                              curnode = curnode->next) {
 385                                 if (strcmp(curnode->name, curfsnode->name) == 0)
 386                                         break;
 387                         }
 388                         if (curnode == NULL) {
 389                                 if (debug & DEBUG_APPLY_SPECONLY) {
 390                                         printf("apply_specdir: trimming %s/%s %p\n", dir, curfsnode->name, curfsnode);
 391                                 }
 392                                 free_fsnodes(curfsnode);
 393                         }
 394                 }
 395         }
 396
 397                         /* now walk specnode->child matching up with dirnode */
 398         for (curnode = specnode->child; curnode != NULL;
 399             curnode = curnode->next) {
 400                 if (debug & DEBUG_APPLY_SPECENTRY)
 401                         printf("apply_specdir:  spec %s\n",
 402                             curnode->name);
 403                 for (curfsnode = dirnode->next; curfsnode != NULL;
 404                     curfsnode = curfsnode->next) {
 405 #if 0   /* too verbose for now */
 406                         if (debug & DEBUG_APPLY_SPECENTRY)
 407                                 printf("apply_specdir:  dirent %s\n",
 408                                     curfsnode->name);
 409 #endif
 410                         if (strcmp(curnode->name, curfsnode->name) == 0)
 411                                 break;
 412                 }
 413                 if (snprintf(path, sizeof(path), "%s/%s",
 414                     dir, curnode->name) >= sizeof(path))
 415                         errx(1, "Pathname too long.");
 416                 if (curfsnode == NULL) {        /* need new entry */
 417                         struct stat     stbuf;
 418
 419                                             /*
 420                                              * don't add optional spec entries
 421                                              * that lack an existing fs entry
 422                                              */
 423                         if ((curnode->flags & F_OPT) &&
 424                             lstat(path, &stbuf) == -1)
 425                                         continue;
 426
 427                                         /* check that enough info is provided */
 428 #define NODETEST(t, m)                                                  \
 429                         if (!(t))                                       \
 430                                 errx(1, "`%s': %s not provided", path, m)
 431                         NODETEST(curnode->flags & F_TYPE, "type");
 432                         NODETEST(curnode->flags & F_MODE, "mode");
 433                                 /* XXX: require F_TIME ? */
 434                         NODETEST(curnode->flags & F_GID ||
 435                             curnode->flags & F_GNAME, "group");
 436                         NODETEST(curnode->flags & F_UID ||
 437                             curnode->flags & F_UNAME, "user");
 438 /*                      if (curnode->type == F_BLOCK || curnode->type == F_CHAR)
 439                                 NODETEST(curnode->flags & F_DEV,
 440                                     "device number");*/
 441 #undef NODETEST
 442
 443                         if (debug & DEBUG_APPLY_SPECFILE)
 444                                 printf("apply_specdir: adding %s\n",
 445                                     curnode->name);
 446                                         /* build minimal fsnode */
 447                         memset(&stbuf, 0, sizeof(stbuf));
 448                         stbuf.st_mode = nodetoino(curnode->type);
 449                         stbuf.st_nlink = 1;
 450                         stbuf.st_mtime = stbuf.st_atime =
 451                             stbuf.st_ctime = start_time.tv_sec;
 452 #if HAVE_STRUCT_STAT_ST_MTIMENSEC
 453                         stbuf.st_mtimensec = stbuf.st_atimensec =
 454                             stbuf.st_ctimensec = start_time.tv_nsec;
 455 #endif
 456                         curfsnode = create_fsnode(".", ".", curnode->name,
 457                             &stbuf);
 458                         curfsnode->parent = dirnode->parent;
 459                         curfsnode->first = dirnode;
 460                         curfsnode->next = dirnode->next;
 461                         dirnode->next = curfsnode;
 462                         if (curfsnode->type == S_IFDIR) {
 463                                         /* for dirs, make "." entry as well */
 464                                 curfsnode->child = create_fsnode(".", ".", ".",
 465                                     &stbuf);
 466                                 curfsnode->child->parent = curfsnode;
 467                                 curfsnode->child->first = curfsnode->child;
 468                         }
 469                         if (curfsnode->type == S_IFLNK) {
 470                                 assert(curnode->slink != NULL);
 471                                         /* for symlinks, copy the target */
 472                                 if ((curfsnode->symlink =
 473                                     strdup(curnode->slink)) == NULL)
 474                                         err(1, "Memory allocation error");
 475                         }
 476                 }
 477                 apply_specentry(dir, curnode, curfsnode);
 478                 if (curnode->type == F_DIR) {
 479                         if (curfsnode->type != S_IFDIR)
 480                                 errx(1, "`%s' is not a directory", path);
 481                         assert (curfsnode->child != NULL);
 482                         apply_specdir(path, curnode, curfsnode->child, speconly);
 483                 }
 484         }
 485 }
 486
 487 static void
 488 apply_specentry(const char *dir, NODE *specnode, fsnode *dirnode)
 489 {
 490
 491         assert(specnode != NULL);
 492         assert(dirnode != NULL);
 493
 494         if (nodetoino(specnode->type) != dirnode->type)
 495                 errx(1, "`%s/%s' type mismatch: specfile %s, tree %s",
 496                     dir, specnode->name, inode_type(nodetoino(specnode->type)),
 497                     inode_type(dirnode->type));
 498
 499         if (debug & DEBUG_APPLY_SPECENTRY)
 500                 printf("apply_specentry: %s/%s\n", dir, dirnode->name);
 501
 502 #define ASEPRINT(t, b, o, n) \
 503                 if (debug & DEBUG_APPLY_SPECENTRY) \
 504                         printf("\t\t\tchanging %s from " b " to " b "\n", \
 505                             t, o, n)
 506
 507         if (specnode->flags & (F_GID | F_GNAME)) {
 508                 ASEPRINT("gid", "%d",
 509                     dirnode->inode->st.st_gid, specnode->st_gid);
 510                 dirnode->inode->st.st_gid = specnode->st_gid;
 511         }
 512         if (specnode->flags & F_MODE) {
 513                 ASEPRINT("mode", "%#o",
 514                     dirnode->inode->st.st_mode & ALLPERMS, specnode->st_mode);
 515                 dirnode->inode->st.st_mode &= ~ALLPERMS;
 516                 dirnode->inode->st.st_mode |= (specnode->st_mode & ALLPERMS);
 517         }
 518                 /* XXX: ignoring F_NLINK for now */
 519         if (specnode->flags & F_SIZE) {
 520                 ASEPRINT("size", "%lld",
 521                     (long long)dirnode->inode->st.st_size,
 522                     (long long)specnode->st_size);
 523                 dirnode->inode->st.st_size = specnode->st_size;
 524         }
 525         if (specnode->flags & F_SLINK) {
 526                 assert(dirnode->symlink != NULL);
 527                 assert(specnode->slink != NULL);
 528                 ASEPRINT("symlink", "%s", dirnode->symlink, specnode->slink);
 529                 free(dirnode->symlink);
 530                 if ((dirnode->symlink = strdup(specnode->slink)) == NULL)
 531                         err(1, "Memory allocation error");
 532         }
 533         if (specnode->flags & F_TIME) {
 534                 ASEPRINT("time", "%ld",
 535                     (long)dirnode->inode->st.st_mtime,
 536                     (long)specnode->st_mtimespec.tv_sec);
 537                 dirnode->inode->st.st_mtime =           specnode->st_mtimespec.tv_sec;
 538                 dirnode->inode->st.st_atime =           specnode->st_mtimespec.tv_sec;
 539                 dirnode->inode->st.st_ctime =           start_time.tv_sec;
 540 #if HAVE_STRUCT_STAT_ST_MTIMENSEC
 541                 dirnode->inode->st.st_mtimensec =       specnode->st_mtimespec.tv_nsec;
 542                 dirnode->inode->st.st_atimensec =       specnode->st_mtimespec.tv_nsec;
 543                 dirnode->inode->st.st_ctimensec =       start_time.tv_nsec;
 544 #endif
 545         }
 546         if (specnode->flags & (F_UID | F_UNAME)) {
 547                 ASEPRINT("uid", "%d",
 548                     dirnode->inode->st.st_uid, specnode->st_uid);
 549                 dirnode->inode->st.st_uid = specnode->st_uid;
 550         }
 551 #if HAVE_STRUCT_STAT_ST_FLAGS
 552         if (specnode->flags & F_FLAGS) {
 553                 ASEPRINT("flags", "%#lX",
 554                     (unsigned long)dirnode->inode->st.st_flags,
 555                     (unsigned long)specnode->st_flags);
 556                 dirnode->inode->st.st_flags = specnode->st_flags;
 557         }
 558 #endif
 559 /*      if (specnode->flags & F_DEV) {
 560                 ASEPRINT("rdev", "%#llx",
 561                     (unsigned long long)dirnode->inode->st.st_rdev,
 562                     (unsigned long long)specnode->st_rdev);
 563                 dirnode->inode->st.st_rdev = specnode->st_rdev;
 564         }*/
 565 #undef ASEPRINT
 566
 567         dirnode->flags |= FSNODE_F_HASSPEC;
 568 }
 569
 570
 571 /*
 572  * dump_fsnodes --
 573  *      dump the fsnodes from `cur'
 574  */
 575 void
 576 dump_fsnodes(fsnode *root)
 577 {
 578         fsnode  *cur;
 579         char    path[MAXPATHLEN + 1];
 580
 581         printf("dump_fsnodes: %s %p\n", root->path, root);
 582         for (cur = root; cur != NULL; cur = cur->next) {
 583                 if (snprintf(path, sizeof(path), "%s/%s", cur->path,
 584                     cur->name) >= (int)sizeof(path))
 585                         errx(1, "Pathname too long.");
 586
 587                 if (debug & DEBUG_DUMP_FSNODES_VERBOSE)
 588                         printf("cur=%8p parent=%8p first=%8p ",
 589                             cur, cur->parent, cur->first);
 590                 printf("%7s: %s", inode_type(cur->type), path);
 591                 if (S_ISLNK(cur->type)) {
 592                         assert(cur->symlink != NULL);
 593                         printf(" -> %s", cur->symlink);
 594                 } else {
 595                         assert (cur->symlink == NULL);
 596                 }
 597                 if (cur->inode->nlink > 1)
 598                         printf(", nlinks=%d", cur->inode->nlink);
 599                 putchar('\n');
 600
 601                 if (cur->child) {
 602                         assert (cur->type == S_IFDIR);
 603                         dump_fsnodes(cur->child);
 604                 }
 605         }
 606         printf("dump_fsnodes: finished %s/%s\n", root->path, root->name);
 607 }
 608
 609
 610 /*
 611  * inode_type --
 612  *      for a given inode type `mode', return a descriptive string.
 613  *      for most cases, uses inotype() from mtree/misc.c
 614  */
 615 const char *
 616 inode_type(mode_t mode)
 617 {
 618         if (S_ISREG(mode))
 619                 return ("file");
 620         if (S_ISLNK(mode))
 621                 return ("symlink");
 622         if (S_ISDIR(mode))
 623                 return ("dir");
 624         if (S_ISLNK(mode))
 625                 return ("link");
 626         if (S_ISFIFO(mode))
 627                 return ("fifo");
 628         if (S_ISSOCK(mode))
 629                 return ("socket");
 630         /* XXX should not happen but handle them */
 631         if (S_ISCHR(mode))
 632                 return ("char");
 633         if (S_ISBLK(mode))
 634                 return ("block");
 635         return ("unknown");
 636 }
 637
 638
 639 /*
 640  * link_check --
 641  *      return pointer to fsinode matching `entry's st_ino & st_dev if it exists,
 642  *      otherwise add `entry' to table and return NULL
 643  */
 644 /* This was borrowed from du.c and tweaked to keep an fsnode
 645  * pointer instead. -- dbj@netbsd.org
 646  */
 647 static fsinode *
 648 link_check(fsinode *entry)
 649 {
 650         static struct entry {
 651                 fsinode *data;
 652         } *htable;
 653         static int htshift;  /* log(allocated size) */
 654         static int htmask;   /* allocated size - 1 */
 655         static int htused;   /* 2*number of insertions */
 656         int h, h2;
 657         uint64_t tmp;
 658         /* this constant is (1<<64)/((1+sqrt(5))/2)
 659          * aka (word size)/(golden ratio)
 660          */
 661         const uint64_t HTCONST = 11400714819323198485ULL;
 662         const int HTBITS = 64;
 663
 664         /* Never store zero in hashtable */
 665         assert(entry);
 666
 667         /* Extend hash table if necessary, keep load under 0.5 */
 668         if (htused<<1 >= htmask) {
 669                 struct entry *ohtable;
 670
 671                 if (!htable)
 672                         htshift = 10;   /* starting hashtable size */
 673                 else
 674                         htshift++;   /* exponential hashtable growth */
 675
 676                 htmask  = (1 << htshift) - 1;
 677                 htused = 0;
 678
 679                 ohtable = htable;
 680                 htable = calloc(htmask+1, sizeof(*htable));
 681                 if (!htable)
 682                         err(1, "Memory allocation error");
 683
 684                 /* populate newly allocated hashtable */
 685                 if (ohtable) {
 686                         int i;
 687                         for (i = 0; i <= htmask>>1; i++)
 688                                 if (ohtable[i].data)
 689                                         link_check(ohtable[i].data);
 690                         free(ohtable);
 691                 }
 692         }
 693
 694         /* multiplicative hashing */
 695         tmp = entry->st.st_dev;
 696         tmp <<= HTBITS>>1;
 697         tmp |=  entry->st.st_ino;
 698         tmp *= HTCONST;
 699         h  = tmp >> (HTBITS - htshift);
 700         h2 = 1 | ( tmp >> (HTBITS - (htshift<<1) - 1)); /* must be odd */
 701
 702         /* open address hashtable search with double hash probing */
 703         while (htable[h].data) {
 704                 if ((htable[h].data->st.st_ino == entry->st.st_ino) &&
 705                     (htable[h].data->st.st_dev == entry->st.st_dev)) {
 706                         return htable[h].data;
 707                 }
 708                 h = (h + h2) & htmask;
 709         }
 710
 711         /* Insert the current entry into hashtable */
 712         htable[h].data = entry;
 713         htused++;
 714         return NULL;
 715 }