lib/vfs/direntry.c

   1 /*
   2    Directory cache support
   3
   4    Copyright (C) 1998, 2011
   5    The Free Software Foundation, Inc.
   6
   7    Written by:
   8    Pavel Machek <pavel@ucw.cz>, 1998
   9
  10    This file is part of the Midnight Commander.
  11
  12    The Midnight Commander is free software: you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation, either version 3 of the License,
  15    or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24
  25    \warning Paths here do _not_ begin with '/', so root directory of
  26    archive/site is simply "".
  27  */
  28
  29 /** \file
  30  *  \brief Source: directory cache support
  31  *
  32  *  So that you do not have copy of this in each and every filesystem.
  33  *
  34  *  Very loosely based on tar.c from midnight and archives.[ch] from
  35  *  avfs by Miklos Szeredi (mszeredi@inf.bme.hu)
  36  *
  37  *  Unfortunately, I was unable to keep all filesystems
  38  *  uniform. tar-like filesystems use tree structure where each
  39  *  directory has pointers to its subdirectories. We can do this
  40  *  because we have full information about our archive.
  41  *
  42  *  At ftp-like filesystems, situation is a little bit different. When
  43  *  you cd /usr/src/linux/drivers/char, you do _not_ want /usr,
  44  *  /usr/src, /usr/src/linux and /usr/src/linux/drivers to be
  45  *  listed. That means that we do not have complete information, and if
  46  *  /usr is symlink to /4, we will not know. Also we have to time out
  47  *  entries and things would get messy with tree-like approach. So we
  48  *  do different trick: root directory is completely special and
  49  *  completely fake, it contains entries such as 'usr', 'usr/src', ...,
  50  *  and we'll try to use custom find_entry function.
  51  *
  52  *  \author Pavel Machek <pavel@ucw.cz>
  53  *  \date 1998
  54  *
  55  */
  56
  57 #include <config.h>
  58
  59 #include <errno.h>
  60 #include <fcntl.h>              /* include fcntl.h -> sys/fcntl.h only       */
  61                                 /* includes fcntl.h see IEEE Std 1003.1-2008 */
  62 #include <time.h>
  63 #include <sys/time.h>           /* gettimeofday() */
  64 #include <inttypes.h>           /* uintmax_t */
  65 #include <stdarg.h>
  66
  67 #include "lib/global.h"
  68
  69 #include "lib/tty/tty.h"        /* enable/disable interrupt key */
  70 #include "lib/util.h"           /* custom_canonicalize_pathname() */
  71 #if 0
  72 #include "lib/widget.h"         /* message() */
  73 #endif
  74
  75 #include "vfs.h"
  76 #include "utilvfs.h"
  77 #include "xdirentry.h"
  78 #include "gc.h"                 /* vfs_rmstamp */
  79
  80 /*** global variables ****************************************************************************/
  81
  82 /*** file scope macro definitions ****************************************************************/
  83
  84 #define CALL(x) if (MEDATA->x) MEDATA->x
  85
  86 /*** file scope type declarations ****************************************************************/
  87
  88 struct dirhandle
  89 {
  90     GList *cur;
  91     struct vfs_s_inode *dir;
  92 };
  93
  94 /*** file scope variables ************************************************************************/
  95
  96 static volatile int total_inodes = 0, total_entries = 0;
  97
  98 /*** file scope functions ************************************************************************/
  99 /* --------------------------------------------------------------------------------------------- */
 100
 101 static int
 102 vfs_s_entry_compare (const void *a, const void *b)
 103 {
 104     const struct vfs_s_entry *e = (const struct vfs_s_entry *) a;
 105     const char *name = (const char *) b;
 106
 107     return strcmp (e->name, name);
 108 }
 109
 110 /* --------------------------------------------------------------------------------------------- */
 111
 112 /* We were asked to create entries automagically */
 113
 114 static struct vfs_s_entry *
 115 vfs_s_automake (struct vfs_class *me, struct vfs_s_inode *dir, char *path, int flags)
 116 {
 117     struct vfs_s_entry *res;
 118     char *sep;
 119
 120     sep = strchr (path, PATH_SEP);
 121     if (sep != NULL)
 122         *sep = '\0';
 123
 124     res = vfs_s_generate_entry (me, path, dir, flags & FL_MKDIR ? (0777 | S_IFDIR) : 0777);
 125     vfs_s_insert_entry (me, dir, res);
 126
 127     if (sep != NULL)
 128         *sep = PATH_SEP;
 129
 130     return res;
 131 }
 132
 133 /* --------------------------------------------------------------------------------------------- */
 134 /* If the entry is a symlink, find the entry for its target */
 135
 136 static struct vfs_s_entry *
 137 vfs_s_resolve_symlink (struct vfs_class *me, struct vfs_s_entry *entry, int follow)
 138 {
 139     char *linkname;
 140     char *fullname = NULL;
 141     struct vfs_s_entry *target;
 142
 143     if (follow == LINK_NO_FOLLOW)
 144         return entry;
 145     if (follow == 0)
 146         ERRNOR (ELOOP, NULL);
 147     if (!entry)
 148         ERRNOR (ENOENT, NULL);
 149     if (!S_ISLNK (entry->ino->st.st_mode))
 150         return entry;
 151
 152     linkname = entry->ino->linkname;
 153     if (linkname == NULL)
 154         ERRNOR (EFAULT, NULL);
 155
 156     /* make full path from relative */
 157     if (*linkname != PATH_SEP)
 158     {
 159         char *fullpath = vfs_s_fullpath (me, entry->dir);
 160         if (fullpath)
 161         {
 162             fullname = g_strconcat (fullpath, "/", linkname, (char *) NULL);
 163             linkname = fullname;
 164             g_free (fullpath);
 165         }
 166     }
 167
 168     target = (MEDATA->find_entry) (me, entry->dir->super->root, linkname, follow - 1, 0);
 169     g_free (fullname);
 170     return target;
 171 }
 172
 173 /* --------------------------------------------------------------------------------------------- */
 174 /*
 175  * Follow > 0: follow links, serves as loop protect,
 176  *       == -1: do not follow links
 177  */
 178
 179 static struct vfs_s_entry *
 180 vfs_s_find_entry_tree (struct vfs_class *me, struct vfs_s_inode *root,
 181                        const char *a_path, int follow, int flags)
 182 {
 183     size_t pseg;
 184     struct vfs_s_entry *ent = NULL;
 185     char *const pathref = g_strdup (a_path);
 186     char *path = pathref;
 187
 188     /* canonicalize as well, but don't remove '../' from path */
 189     custom_canonicalize_pathname (path, CANON_PATH_ALL & (~CANON_PATH_REMDOUBLEDOTS));
 190
 191     while (root != NULL)
 192     {
 193         GList *iter;
 194
 195         while (*path == PATH_SEP)       /* Strip leading '/' */
 196             path++;
 197
 198         if (path[0] == '\0')
 199         {
 200             g_free (pathref);
 201             return ent;
 202         }
 203
 204         for (pseg = 0; path[pseg] != '\0' && path[pseg] != PATH_SEP; pseg++)
 205             ;
 206
 207         for (iter = root->subdir; iter != NULL; iter = g_list_next (iter))
 208         {
 209             ent = (struct vfs_s_entry *) iter->data;
 210             if (strlen (ent->name) == pseg && strncmp (ent->name, path, pseg) == 0)
 211                 /* FOUND! */
 212                 break;
 213         }
 214
 215         ent = iter != NULL ? (struct vfs_s_entry *) iter->data : NULL;
 216
 217         if (ent == NULL && (flags & (FL_MKFILE | FL_MKDIR)) != 0)
 218             ent = vfs_s_automake (me, root, path, flags);
 219         if (ent == NULL)
 220         {
 221             me->verrno = ENOENT;
 222             goto cleanup;
 223         }
 224
 225         path += pseg;
 226         /* here we must follow leading directories always;
 227            only the actual file is optional */
 228         ent = vfs_s_resolve_symlink (me, ent,
 229                                      strchr (path, PATH_SEP) != NULL ? LINK_FOLLOW : follow);
 230         if (ent == NULL)
 231             goto cleanup;
 232         root = ent->ino;
 233     }
 234   cleanup:
 235     g_free (pathref);
 236     return NULL;
 237 }
 238
 239 /* --------------------------------------------------------------------------------------------- */
 240
 241 static struct vfs_s_entry *
 242 vfs_s_find_entry_linear (struct vfs_class *me, struct vfs_s_inode *root,
 243                          const char *a_path, int follow, int flags)
 244 {
 245     struct vfs_s_entry *ent = NULL;
 246     char *const path = g_strdup (a_path);
 247     struct vfs_s_entry *retval = NULL;
 248     GList *iter;
 249
 250     if (root->super->root != root)
 251         vfs_die ("We have to use _real_ root. Always. Sorry.");
 252
 253     /* canonicalize as well, but don't remove '../' from path */
 254     custom_canonicalize_pathname (path, CANON_PATH_ALL & (~CANON_PATH_REMDOUBLEDOTS));
 255
 256     if ((flags & FL_DIR) == 0)
 257     {
 258         char *dirname, *name;
 259         struct vfs_s_inode *ino;
 260
 261         dirname = g_path_get_dirname (path);
 262         name = g_path_get_basename (path);
 263         ino = vfs_s_find_inode (me, root->super, dirname, follow, flags | FL_DIR);
 264         retval = vfs_s_find_entry_tree (me, ino, name, follow, flags);
 265         g_free (dirname);
 266         g_free (name);
 267         g_free (path);
 268         return retval;
 269     }
 270
 271     iter = g_list_find_custom (root->subdir, path, (GCompareFunc) vfs_s_entry_compare);
 272     ent = iter != NULL ? (struct vfs_s_entry *) iter->data : NULL;
 273
 274     if (ent != NULL && !MEDATA->dir_uptodate (me, ent->ino))
 275     {
 276 #if 1
 277         vfs_print_message (_("Directory cache expired for %s"), path);
 278 #endif
 279         vfs_s_free_entry (me, ent);
 280         ent = NULL;
 281     }
 282
 283     if (ent == NULL)
 284     {
 285         struct vfs_s_inode *ino;
 286
 287         ino = vfs_s_new_inode (me, root->super, vfs_s_default_stat (me, S_IFDIR | 0755));
 288         ent = vfs_s_new_entry (me, path, ino);
 289         if (MEDATA->dir_load (me, ino, path) == -1)
 290         {
 291             vfs_s_free_entry (me, ent);
 292             g_free (path);
 293             return NULL;
 294         }
 295
 296         vfs_s_insert_entry (me, root, ent);
 297
 298         iter = g_list_find_custom (root->subdir, path, (GCompareFunc) vfs_s_entry_compare);
 299         ent = iter != NULL ? (struct vfs_s_entry *) iter->data : NULL;
 300     }
 301     if (ent == NULL)
 302         vfs_die ("find_linear: success but directory is not there\n");
 303
 304 #if 0
 305     if (!vfs_s_resolve_symlink (me, ent, follow))
 306     {
 307         g_free (path);
 308         return NULL;
 309     }
 310 #endif
 311     g_free (path);
 312     return ent;
 313 }
 314
 315 /* --------------------------------------------------------------------------------------------- */
 316 /* Ook, these were functions around directory entries / inodes */
 317 /* -------------------------------- superblock games -------------------------- */
 318
 319 static struct vfs_s_super *
 320 vfs_s_new_super (struct vfs_class *me)
 321 {
 322     struct vfs_s_super *super;
 323
 324     super = g_new0 (struct vfs_s_super, 1);
 325     super->me = me;
 326     return super;
 327 }
 328
 329 /* --------------------------------------------------------------------------------------------- */
 330
 331 static inline void
 332 vfs_s_insert_super (struct vfs_class *me, struct vfs_s_super *super)
 333 {
 334     MEDATA->supers = g_list_prepend (MEDATA->supers, super);
 335 }
 336
 337 /* --------------------------------------------------------------------------------------------- */
 338
 339 static void
 340 vfs_s_free_super (struct vfs_class *me, struct vfs_s_super *super)
 341 {
 342     if (super->root != NULL)
 343     {
 344         vfs_s_free_inode (me, super->root);
 345         super->root = NULL;
 346     }
 347
 348 #if 0
 349     /* FIXME: We currently leak small ammount of memory, sometimes. Fix it if you can. */
 350     if (super->ino_usage)
 351         message (D_ERROR, "Direntry warning",
 352                  "Super ino_usage is %d, memory leak", super->ino_usage);
 353
 354     if (super->want_stale)
 355         message (D_ERROR, "Direntry warning", "%s", "Super has want_stale set");
 356 #endif
 357
 358     MEDATA->supers = g_list_remove (MEDATA->supers, super);
 359
 360     CALL (free_archive) (me, super);
 361 #ifdef ENABLE_VFS_NET
 362     vfs_path_element_free (super->path_element);
 363 #endif
 364     g_free (super->name);
 365     g_free (super);
 366 }
 367
 368 /* --------------------------------------------------------------------------------------------- */
 369 /* Support of archives */
 370 /* ------------------------ readdir & friends ----------------------------- */
 371
 372 static struct vfs_s_inode *
 373 vfs_s_inode_from_path (const vfs_path_t * vpath, int flags)
 374 {
 375     struct vfs_s_super *super;
 376     struct vfs_s_inode *ino;
 377     const char *q;
 378     const vfs_path_element_t *path_element;
 379
 380     q = vfs_s_get_path (vpath, &super, 0);
 381     if (q == NULL)
 382         return NULL;
 383
 384     path_element = vfs_path_get_by_index (vpath, -1);
 385
 386     ino =
 387         vfs_s_find_inode (path_element->class, super, q,
 388                           flags & FL_FOLLOW ? LINK_FOLLOW : LINK_NO_FOLLOW, flags & ~FL_FOLLOW);
 389     if ((!ino) && (!*q))
 390         /* We are asking about / directory of ftp server: assume it exists */
 391         ino =
 392             vfs_s_find_inode (path_element->class, super, q,
 393                               flags & FL_FOLLOW ? LINK_FOLLOW :
 394                               LINK_NO_FOLLOW, FL_DIR | (flags & ~FL_FOLLOW));
 395     return ino;
 396 }
 397
 398 /* --------------------------------------------------------------------------------------------- */
 399
 400 static void *
 401 vfs_s_opendir (const vfs_path_t * vpath)
 402 {
 403     struct vfs_s_inode *dir;
 404     struct dirhandle *info;
 405     const vfs_path_element_t *path_element;
 406
 407     path_element = vfs_path_get_by_index (vpath, -1);
 408
 409     dir = vfs_s_inode_from_path (vpath, FL_DIR | FL_FOLLOW);
 410     if (dir == NULL)
 411         return NULL;
 412     if (!S_ISDIR (dir->st.st_mode))
 413     {
 414         path_element->class->verrno = ENOTDIR;
 415         return NULL;
 416     }
 417
 418     dir->st.st_nlink++;
 419 #if 0
 420     if (dir->subdir == NULL)    /* This can actually happen if we allow empty directories */
 421     {
 422         path_element->class->verrno = EAGAIN;
 423         return NULL;
 424     }
 425 #endif
 426     info = g_new (struct dirhandle, 1);
 427     info->cur = dir->subdir;
 428     info->dir = dir;
 429
 430     return info;
 431 }
 432
 433 /* --------------------------------------------------------------------------------------------- */
 434
 435 static void *
 436 vfs_s_readdir (void *data)
 437 {
 438     static union vfs_dirent dir;
 439     struct dirhandle *info = (struct dirhandle *) data;
 440     const char *name;
 441
 442     if (info->cur == NULL || info->cur->data == NULL)
 443         return NULL;
 444
 445     name = ((struct vfs_s_entry *) info->cur->data)->name;
 446     if (name != NULL)
 447         g_strlcpy (dir.dent.d_name, name, MC_MAXPATHLEN);
 448     else
 449         vfs_die ("Null in structure-cannot happen");
 450
 451     compute_namelen (&dir.dent);
 452     info->cur = g_list_next (info->cur);
 453
 454     return (void *) &dir;
 455 }
 456
 457 /* --------------------------------------------------------------------------------------------- */
 458
 459 static int
 460 vfs_s_closedir (void *data)
 461 {
 462     struct dirhandle *info = (struct dirhandle *) data;
 463     struct vfs_s_inode *dir = info->dir;
 464
 465     vfs_s_free_inode (dir->super->me, dir);
 466     g_free (data);
 467     return 0;
 468 }
 469
 470 /* --------------------------------------------------------------------------------------------- */
 471
 472 static int
 473 vfs_s_chdir (const vfs_path_t * vpath)
 474 {
 475     void *data;
 476
 477     data = vfs_s_opendir (vpath);
 478     if (data == NULL)
 479         return -1;
 480     vfs_s_closedir (data);
 481     return 0;
 482 }
 483
 484 /* --------------------------------------------------------------------------------------------- */
 485 /* --------------------------- stat and friends ---------------------------- */
 486
 487 static int
 488 vfs_s_internal_stat (const vfs_path_t * vpath, struct stat *buf, int flag)
 489 {
 490     struct vfs_s_inode *ino;
 491
 492     ino = vfs_s_inode_from_path (vpath, flag);
 493     if (ino == NULL)
 494         return -1;
 495     *buf = ino->st;
 496     return 0;
 497 }
 498
 499 /* --------------------------------------------------------------------------------------------- */
 500
 501 static int
 502 vfs_s_stat (const vfs_path_t * vpath, struct stat *buf)
 503 {
 504     return vfs_s_internal_stat (vpath, buf, FL_FOLLOW);
 505 }
 506
 507 /* --------------------------------------------------------------------------------------------- */
 508
 509 static int
 510 vfs_s_lstat (const vfs_path_t * vpath, struct stat *buf)
 511 {
 512     return vfs_s_internal_stat (vpath, buf, FL_NONE);
 513 }
 514
 515 /* --------------------------------------------------------------------------------------------- */
 516
 517 static int
 518 vfs_s_fstat (void *fh, struct stat *buf)
 519 {
 520     *buf = FH->ino->st;
 521     return 0;
 522 }
 523
 524 /* --------------------------------------------------------------------------------------------- */
 525
 526 static int
 527 vfs_s_readlink (const vfs_path_t * vpath, char *buf, size_t size)
 528 {
 529     struct vfs_s_inode *ino;
 530     size_t len;
 531     const vfs_path_element_t *path_element;
 532
 533     path_element = vfs_path_get_by_index (vpath, -1);
 534
 535     ino = vfs_s_inode_from_path (vpath, 0);
 536     if (!ino)
 537         return -1;
 538
 539     if (!S_ISLNK (ino->st.st_mode))
 540     {
 541         path_element->class->verrno = EINVAL;
 542         return -1;
 543     }
 544
 545     if (ino->linkname == NULL)
 546     {
 547         path_element->class->verrno = EFAULT;
 548         return -1;
 549     }
 550
 551     len = strlen (ino->linkname);
 552     if (size < len)
 553         len = size;
 554     /* readlink() does not append a NUL character to buf */
 555     memcpy (buf, ino->linkname, len);
 556     return len;
 557 }
 558
 559 /* --------------------------------------------------------------------------------------------- */
 560
 561 static ssize_t
 562 vfs_s_read (void *fh, char *buffer, size_t count)
 563 {
 564     struct vfs_class *me = FH_SUPER->me;
 565
 566     if (FH->linear == LS_LINEAR_PREOPEN)
 567     {
 568         if (!MEDATA->linear_start (me, FH, FH->pos))
 569             return -1;
 570     }
 571
 572     if (FH->linear == LS_LINEAR_CLOSED)
 573         vfs_die ("linear_start() did not set linear_state!");
 574
 575     if (FH->linear == LS_LINEAR_OPEN)
 576         return MEDATA->linear_read (me, FH, buffer, count);
 577
 578     if (FH->handle != -1)
 579     {
 580         ssize_t n;
 581
 582         n = read (FH->handle, buffer, count);
 583         if (n < 0)
 584             me->verrno = errno;
 585         return n;
 586     }
 587     vfs_die ("vfs_s_read: This should not happen\n");
 588     return -1;
 589 }
 590
 591 /* --------------------------------------------------------------------------------------------- */
 592
 593 static ssize_t
 594 vfs_s_write (void *fh, const char *buffer, size_t count)
 595 {
 596     struct vfs_class *me = FH_SUPER->me;
 597
 598     if (FH->linear)
 599         vfs_die ("no writing to linear files, please");
 600
 601     FH->changed = 1;
 602     if (FH->handle != -1)
 603     {
 604         ssize_t n;
 605
 606         n = write (FH->handle, buffer, count);
 607         if (n < 0)
 608             me->verrno = errno;
 609         return n;
 610     }
 611     vfs_die ("vfs_s_write: This should not happen\n");
 612     return 0;
 613 }
 614
 615 /* --------------------------------------------------------------------------------------------- */
 616
 617 static off_t
 618 vfs_s_lseek (void *fh, off_t offset, int whence)
 619 {
 620     off_t size = FH->ino->st.st_size;
 621
 622     if (FH->linear == LS_LINEAR_OPEN)
 623         vfs_die ("cannot lseek() after linear_read!");
 624
 625     if (FH->handle != -1)
 626     {                           /* If we have local file opened, we want to work with it */
 627         off_t retval = lseek (FH->handle, offset, whence);
 628         if (retval == -1)
 629             FH->ino->super->me->verrno = errno;
 630         return retval;
 631     }
 632
 633     switch (whence)
 634     {
 635     case SEEK_CUR:
 636         offset += FH->pos;
 637         break;
 638     case SEEK_END:
 639         offset += size;
 640         break;
 641     }
 642     if (offset < 0)
 643         FH->pos = 0;
 644     else if (offset < size)
 645         FH->pos = offset;
 646     else
 647         FH->pos = size;
 648     return FH->pos;
 649 }
 650
 651 /* --------------------------------------------------------------------------------------------- */
 652
 653 static int
 654 vfs_s_close (void *fh)
 655 {
 656     int res = 0;
 657     struct vfs_class *me = FH_SUPER->me;
 658
 659     FH_SUPER->fd_usage--;
 660     if (!FH_SUPER->fd_usage)
 661         vfs_stamp_create (me, FH_SUPER);
 662
 663     if (FH->linear == LS_LINEAR_OPEN)
 664         MEDATA->linear_close (me, fh);
 665     if (MEDATA->fh_close)
 666         res = MEDATA->fh_close (me, fh);
 667     if ((MEDATA->flags & VFS_S_USETMP) && FH->changed && MEDATA->file_store)
 668     {
 669         char *s = vfs_s_fullpath (me, FH->ino);
 670         if (!s)
 671             res = -1;
 672         else
 673         {
 674             res = MEDATA->file_store (me, fh, s, FH->ino->localname);
 675             g_free (s);
 676         }
 677         vfs_s_invalidate (me, FH_SUPER);
 678     }
 679     if (FH->handle != -1)
 680         close (FH->handle);
 681
 682     vfs_s_free_inode (me, FH->ino);
 683     if (MEDATA->fh_free_data != NULL)
 684         MEDATA->fh_free_data (fh);
 685     g_free (fh);
 686     return res;
 687 }
 688
 689 /* --------------------------------------------------------------------------------------------- */
 690
 691 static void
 692 vfs_s_print_stats (const char *fs_name, const char *action,
 693                    const char *file_name, off_t have, off_t need)
 694 {
 695     static const char *i18n_percent_transf_format = NULL;
 696     static const char *i18n_transf_format = NULL;
 697
 698     if (i18n_percent_transf_format == NULL)
 699     {
 700         i18n_percent_transf_format = "%s: %s: %s %3d%% (%" PRIuMAX " %s";
 701         i18n_transf_format = "%s: %s: %s %" PRIuMAX " %s";
 702     }
 703
 704     if (need)
 705         vfs_print_message (i18n_percent_transf_format, fs_name, action,
 706                            file_name, (int) ((double) have * 100 / need), (uintmax_t) have,
 707                            _("bytes transferred"));
 708     else
 709         vfs_print_message (i18n_transf_format, fs_name, action, file_name, (uintmax_t) have,
 710                            _("bytes transferred"));
 711 }
 712
 713 /* --------------------------------------------------------------------------------------------- */
 714 /* ------------------------------- mc support ---------------------------- */
 715
 716 static void
 717 vfs_s_fill_names (struct vfs_class *me, fill_names_f func)
 718 {
 719     GList *iter;
 720
 721     for (iter = MEDATA->supers; iter != NULL; iter = g_list_next (iter))
 722     {
 723         const struct vfs_s_super *super = (const struct vfs_s_super *) iter->data;
 724         char *name;
 725
 726         name = g_strconcat (super->name, "/", me->prefix, VFS_PATH_URL_DELIMITER,
 727                             /* super->current_dir->name, */ (char *) NULL);
 728         func (name);
 729         g_free (name);
 730     }
 731 }
 732
 733 /* --------------------------------------------------------------------------------------------- */
 734
 735 static int
 736 vfs_s_ferrno (struct vfs_class *me)
 737 {
 738     return me->verrno;
 739 }
 740
 741 /* --------------------------------------------------------------------------------------------- */
 742 /**
 743  * Get local copy of the given file.  We reuse the existing file cache
 744  * for remote filesystems.  Archives use standard VFS facilities.
 745  */
 746
 747 static vfs_path_t *
 748 vfs_s_getlocalcopy (const vfs_path_t * vpath)
 749 {
 750     vfs_file_handler_t *fh;
 751     vfs_path_t *local = NULL;
 752
 753     if (vpath == NULL)
 754         return NULL;
 755
 756     fh = vfs_s_open (vpath, O_RDONLY, 0);
 757
 758     if (fh != NULL)
 759     {
 760         const struct vfs_class *me;
 761
 762         me = vfs_path_get_by_index (vpath, -1)->class;
 763         if ((MEDATA->flags & VFS_S_USETMP) != 0 && (fh->ino != NULL))
 764             local = vfs_path_from_str_flags (fh->ino->localname, VPF_NO_CANON);
 765
 766         vfs_s_close (fh);
 767     }
 768
 769     return local;
 770 }
 771
 772 /* --------------------------------------------------------------------------------------------- */
 773 /**
 774  * Return the local copy.  Since we are using our cache, we do nothing -
 775  * the cache will be removed when the archive is closed.
 776  */
 777
 778 static int
 779 vfs_s_ungetlocalcopy (const vfs_path_t * vpath, const vfs_path_t * local, gboolean has_changed)
 780 {
 781     (void) vpath;
 782     (void) local;
 783     (void) has_changed;
 784     return 0;
 785 }
 786
 787 /* --------------------------------------------------------------------------------------------- */
 788
 789 static int
 790 vfs_s_setctl (const vfs_path_t * vpath, int ctlop, void *arg)
 791 {
 792     const vfs_path_element_t *path_element;
 793
 794     path_element = vfs_path_get_by_index (vpath, -1);
 795
 796     switch (ctlop)
 797     {
 798     case VFS_SETCTL_STALE_DATA:
 799         {
 800             struct vfs_s_inode *ino;
 801
 802             ino = vfs_s_inode_from_path (vpath, 0);
 803             if (ino == NULL)
 804                 return 0;
 805             if (arg)
 806                 ino->super->want_stale = 1;
 807             else
 808             {
 809                 ino->super->want_stale = 0;
 810                 vfs_s_invalidate (path_element->class, ino->super);
 811             }
 812             return 1;
 813         }
 814     case VFS_SETCTL_LOGFILE:
 815         ((struct vfs_s_subclass *) path_element->class->data)->logfile = fopen ((char *) arg, "w");
 816         return 1;
 817     case VFS_SETCTL_FLUSH:
 818         ((struct vfs_s_subclass *) path_element->class->data)->flush = 1;
 819         return 1;
 820     }
 821     return 0;
 822 }
 823
 824 /* --------------------------------------------------------------------------------------------- */
 825 /* ----------------------------- Stamping support -------------------------- */
 826
 827 static vfsid
 828 vfs_s_getid (const vfs_path_t * vpath)
 829 {
 830     struct vfs_s_super *archive = NULL;
 831     const char *p;
 832
 833     p = vfs_s_get_path (vpath, &archive, FL_NO_OPEN);
 834     if (p == NULL)
 835         return NULL;
 836
 837     return (vfsid) archive;
 838 }
 839
 840 /* --------------------------------------------------------------------------------------------- */
 841
 842 static int
 843 vfs_s_nothingisopen (vfsid id)
 844 {
 845     (void) id;
 846     /* Our data structures should survive free of superblock at any time */
 847     return 1;
 848 }
 849
 850 /* --------------------------------------------------------------------------------------------- */
 851
 852 static void
 853 vfs_s_free (vfsid id)
 854 {
 855     vfs_s_free_super (((struct vfs_s_super *) id)->me, (struct vfs_s_super *) id);
 856 }
 857
 858 /* --------------------------------------------------------------------------------------------- */
 859
 860 static int
 861 vfs_s_dir_uptodate (struct vfs_class *me, struct vfs_s_inode *ino)
 862 {
 863     struct timeval tim;
 864
 865     if (MEDATA->flush)
 866     {
 867         MEDATA->flush = 0;
 868         return 0;
 869     }
 870
 871     gettimeofday (&tim, NULL);
 872     if (tim.tv_sec < ino->timestamp.tv_sec)
 873         return 1;
 874     return 0;
 875 }
 876
 877
 878 /* --------------------------------------------------------------------------------------------- */
 879 /*** public functions ****************************************************************************/
 880 /* --------------------------------------------------------------------------------------------- */
 881
 882 struct vfs_s_inode *
 883 vfs_s_new_inode (struct vfs_class *me, struct vfs_s_super *super, struct stat *initstat)
 884 {
 885     struct vfs_s_inode *ino;
 886
 887     ino = g_try_new0 (struct vfs_s_inode, 1);
 888     if (ino == NULL)
 889         return NULL;
 890
 891     if (initstat)
 892         ino->st = *initstat;
 893     ino->super = super;
 894     ino->st.st_nlink = 0;
 895     ino->st.st_ino = MEDATA->inode_counter++;
 896     ino->st.st_dev = MEDATA->rdev;
 897
 898     super->ino_usage++;
 899     total_inodes++;
 900
 901     CALL (init_inode) (me, ino);
 902
 903     return ino;
 904 }
 905
 906 /* --------------------------------------------------------------------------------------------- */
 907
 908 void
 909 vfs_s_free_inode (struct vfs_class *me, struct vfs_s_inode *ino)
 910 {
 911     if (ino == NULL)
 912         vfs_die ("Don't pass NULL to me");
 913
 914     /* ==0 can happen if freshly created entry is deleted */
 915     if (ino->st.st_nlink > 1)
 916     {
 917         ino->st.st_nlink--;
 918         return;
 919     }
 920
 921     while (ino->subdir != NULL)
 922         vfs_s_free_entry (me, (struct vfs_s_entry *) ino->subdir->data);
 923
 924     CALL (free_inode) (me, ino);
 925     g_free (ino->linkname);
 926     if ((MEDATA->flags & VFS_S_USETMP) != 0 && ino->localname != NULL)
 927     {
 928         unlink (ino->localname);
 929         g_free (ino->localname);
 930     }
 931     total_inodes--;
 932     ino->super->ino_usage--;
 933     g_free (ino);
 934 }
 935
 936 /* --------------------------------------------------------------------------------------------- */
 937
 938 struct vfs_s_entry *
 939 vfs_s_new_entry (struct vfs_class *me, const char *name, struct vfs_s_inode *inode)
 940 {
 941     struct vfs_s_entry *entry;
 942
 943     entry = g_new0 (struct vfs_s_entry, 1);
 944     total_entries++;
 945
 946     entry->name = g_strdup (name);
 947     entry->ino = inode;
 948     entry->ino->ent = entry;
 949     CALL (init_entry) (me, entry);
 950
 951     return entry;
 952 }
 953
 954
 955 /* --------------------------------------------------------------------------------------------- */
 956
 957 void
 958 vfs_s_free_entry (struct vfs_class *me, struct vfs_s_entry *ent)
 959 {
 960     if (ent->dir != NULL)
 961         ent->dir->subdir = g_list_remove (ent->dir->subdir, ent);
 962
 963     g_free (ent->name);
 964     /* ent->name = NULL; */
 965
 966     if (ent->ino != NULL)
 967     {
 968         ent->ino->ent = NULL;
 969         vfs_s_free_inode (me, ent->ino);
 970     }
 971
 972     total_entries--;
 973     g_free (ent);
 974 }
 975
 976 /* --------------------------------------------------------------------------------------------- */
 977
 978 void
 979 vfs_s_insert_entry (struct vfs_class *me, struct vfs_s_inode *dir, struct vfs_s_entry *ent)
 980 {
 981     (void) me;
 982
 983     ent->dir = dir;
 984
 985     ent->ino->st.st_nlink++;
 986     dir->subdir = g_list_append (dir->subdir, ent);
 987 }
 988
 989 /* --------------------------------------------------------------------------------------------- */
 990
 991 struct stat *
 992 vfs_s_default_stat (struct vfs_class *me, mode_t mode)
 993 {
 994     static struct stat st;
 995     int myumask;
 996
 997     (void) me;
 998
 999     myumask = umask (022);
1000     umask (myumask);
1001     mode &= ~myumask;
1002
1003     st.st_mode = mode;
1004     st.st_ino = 0;
1005     st.st_dev = 0;
1006     st.st_rdev = 0;
1007     st.st_uid = getuid ();
1008     st.st_gid = getgid ();
1009     st.st_size = 0;
1010     st.st_mtime = st.st_atime = st.st_ctime = time (NULL);
1011
1012     return &st;
1013 }
1014
1015 /* --------------------------------------------------------------------------------------------- */
1016
1017 struct vfs_s_entry *
1018 vfs_s_generate_entry (struct vfs_class *me, const char *name, struct vfs_s_inode *parent,
1019                       mode_t mode)
1020 {
1021     struct vfs_s_inode *inode;
1022     struct stat *st;
1023
1024     st = vfs_s_default_stat (me, mode);
1025     inode = vfs_s_new_inode (me, parent->super, st);
1026
1027     return vfs_s_new_entry (me, name, inode);
1028 }
1029
1030 /* --------------------------------------------------------------------------------------------- */
1031
1032 struct vfs_s_inode *
1033 vfs_s_find_inode (struct vfs_class *me, const struct vfs_s_super *super,
1034                   const char *path, int follow, int flags)
1035 {
1036     struct vfs_s_entry *ent;
1037
1038     if (((MEDATA->flags & VFS_S_REMOTE) == 0) && (*path == '\0'))
1039         return super->root;
1040
1041     ent = (MEDATA->find_entry) (me, super->root, path, follow, flags);
1042     return (ent != NULL) ? ent->ino : NULL;
1043 }
1044
1045 /* --------------------------------------------------------------------------------------------- */
1046 /* Ook, these were functions around directory entries / inodes */
1047 /* -------------------------------- superblock games -------------------------- */
1048 /**
1049  * get superlock object by vpath
1050  *
1051  * @param vpath path
1052  * @return superlock object or NULL if not found
1053  */
1054
1055 struct vfs_s_super *
1056 vfs_get_super_by_vpath (const vfs_path_t * vpath)
1057 {
1058     GList *iter;
1059     void *cookie = NULL;
1060     const vfs_path_element_t *path_element;
1061     struct vfs_s_subclass *subclass;
1062     struct vfs_s_super *super = NULL;
1063     vfs_path_t *vpath_archive;
1064
1065     path_element = vfs_path_get_by_index (vpath, -1);
1066     subclass = ((struct vfs_s_subclass *) path_element->class->data);
1067     if (subclass == NULL)
1068         return NULL;
1069
1070     vpath_archive = vfs_path_clone (vpath);
1071     vfs_path_remove_element_by_index (vpath_archive, -1);
1072
1073     if (subclass->archive_check != NULL)
1074     {
1075         cookie = subclass->archive_check (vpath_archive);
1076         if (cookie == NULL)
1077             goto ret;
1078     }
1079
1080     for (iter = subclass->supers; iter != NULL; iter = g_list_next (iter))
1081     {
1082         int i;
1083
1084         super = (struct vfs_s_super *) iter->data;
1085
1086         /* 0 == other, 1 == same, return it, 2 == other but stop scanning */
1087         i = subclass->archive_same (path_element, super, vpath_archive, cookie);
1088         if (i == 1)
1089             goto ret;
1090         if (i != 0)
1091             break;
1092
1093         super = NULL;
1094     }
1095
1096   ret:
1097     vfs_path_free (vpath_archive);
1098     return super;
1099 }
1100
1101 /* --------------------------------------------------------------------------------------------- */
1102 /**
1103  * get path from last VFS-element and create corresponding superblock
1104  *
1105  * @param vpath source path object
1106  * @param archive pointer to object for store newly created superblock
1107  * @param flags flags
1108  *
1109  * @return path from last VFS-element
1110  */
1111 const char *
1112 vfs_s_get_path (const vfs_path_t * vpath, struct vfs_s_super **archive, int flags)
1113 {
1114     const char *retval = "";
1115     int result = -1;
1116     struct vfs_s_super *super;
1117     const vfs_path_element_t *path_element;
1118     struct vfs_s_subclass *subclass;
1119
1120     path_element = vfs_path_get_by_index (vpath, -1);
1121
1122     if (path_element->path != NULL)
1123         retval = path_element->path;
1124
1125     super = vfs_get_super_by_vpath (vpath);
1126     if (super != NULL)
1127         goto return_success;
1128
1129     if (flags & FL_NO_OPEN)
1130     {
1131         path_element->class->verrno = EIO;
1132         return NULL;
1133     }
1134
1135     super = vfs_s_new_super (path_element->class);
1136
1137     subclass = ((struct vfs_s_subclass *) path_element->class->data);
1138     if (subclass->open_archive != NULL)
1139     {
1140         vfs_path_t *vpath_archive;
1141
1142         vpath_archive = vfs_path_clone (vpath);
1143         vfs_path_remove_element_by_index (vpath_archive, -1);
1144
1145         result = subclass->open_archive (super, vpath_archive, path_element);
1146         vfs_path_free (vpath_archive);
1147     }
1148     if (result == -1)
1149     {
1150         vfs_s_free_super (path_element->class, super);
1151         path_element->class->verrno = EIO;
1152         return NULL;
1153     }
1154     if (!super->name)
1155         vfs_die ("You have to fill name\n");
1156     if (!super->root)
1157         vfs_die ("You have to fill root inode\n");
1158
1159     vfs_s_insert_super (path_element->class, super);
1160     vfs_stamp_create (path_element->class, super);
1161
1162   return_success:
1163     *archive = super;
1164     return retval;
1165 }
1166
1167 /* --------------------------------------------------------------------------------------------- */
1168
1169 void
1170 vfs_s_invalidate (struct vfs_class *me, struct vfs_s_super *super)
1171 {
1172     if (!super->want_stale)
1173     {
1174         vfs_s_free_inode (me, super->root);
1175         super->root = vfs_s_new_inode (me, super, vfs_s_default_stat (me, S_IFDIR | 0755));
1176     }
1177 }
1178
1179 /* --------------------------------------------------------------------------------------------- */
1180
1181 char *
1182 vfs_s_fullpath (struct vfs_class *me, struct vfs_s_inode *ino)
1183 {
1184     if (!ino->ent)
1185         ERRNOR (EAGAIN, NULL);
1186
1187     if ((MEDATA->flags & VFS_S_USETMP) == 0)
1188     {
1189         /* archives */
1190         char *newpath;
1191         char *path = g_strdup (ino->ent->name);
1192         while (1)
1193         {
1194             ino = ino->ent->dir;
1195             if (ino == ino->super->root)
1196                 break;
1197             newpath = g_strconcat (ino->ent->name, "/", path, (char *) NULL);
1198             g_free (path);
1199             path = newpath;
1200         }
1201         return path;
1202     }
1203
1204     /* remote systems */
1205     if ((!ino->ent->dir) || (!ino->ent->dir->ent))
1206         return g_strdup (ino->ent->name);
1207
1208     return g_strconcat (ino->ent->dir->ent->name, PATH_SEP_STR, ino->ent->name, (char *) NULL);
1209 }
1210
1211 /* --------------------------------------------------------------------------------------------- */
1212 /* --------------------------- stat and friends ---------------------------- */
1213
1214 void *
1215 vfs_s_open (const vfs_path_t * vpath, int flags, mode_t mode)
1216 {
1217     int was_changed = 0;
1218     vfs_file_handler_t *fh;
1219     struct vfs_s_super *super;
1220     const char *q;
1221     struct vfs_s_inode *ino;
1222     const vfs_path_element_t *path_element;
1223
1224     path_element = vfs_path_get_by_index (vpath, -1);
1225
1226     q = vfs_s_get_path (vpath, &super, 0);
1227     if (q == NULL)
1228         return NULL;
1229     ino = vfs_s_find_inode (path_element->class, super, q, LINK_FOLLOW, FL_NONE);
1230     if (ino && ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)))
1231     {
1232         path_element->class->verrno = EEXIST;
1233         return NULL;
1234     }
1235     if (!ino)
1236     {
1237         char *dirname, *name;
1238         struct vfs_s_entry *ent;
1239         struct vfs_s_inode *dir;
1240         int tmp_handle;
1241
1242         /* If the filesystem is read-only, disable file creation */
1243         if (!(flags & O_CREAT) || !(path_element->class->write))
1244             return NULL;
1245
1246         dirname = g_path_get_dirname (q);
1247         name = g_path_get_basename (q);
1248         dir = vfs_s_find_inode (path_element->class, super, dirname, LINK_FOLLOW, FL_DIR);
1249         if (dir == NULL)
1250         {
1251             g_free (dirname);
1252             g_free (name);
1253             return NULL;
1254         }
1255         ent = vfs_s_generate_entry (path_element->class, name, dir, 0755);
1256         ino = ent->ino;
1257         vfs_s_insert_entry (path_element->class, dir, ent);
1258         if ((VFSDATA (path_element)->flags & VFS_S_USETMP) != 0)
1259         {
1260             vfs_path_t *tmp_vpath;
1261
1262             tmp_handle = vfs_mkstemps (&tmp_vpath, path_element->class->name, name);
1263             ino->localname = vfs_path_to_str (tmp_vpath);
1264             vfs_path_free (tmp_vpath);
1265             if (tmp_handle == -1)
1266             {
1267                 g_free (dirname);
1268                 g_free (name);
1269                 return NULL;
1270             }
1271
1272             close (tmp_handle);
1273         }
1274         g_free (dirname);
1275         g_free (name);
1276         was_changed = 1;
1277     }
1278
1279     if (S_ISDIR (ino->st.st_mode))
1280     {
1281         path_element->class->verrno = EISDIR;
1282         return NULL;
1283     }
1284
1285     fh = g_new (vfs_file_handler_t, 1);
1286     fh->pos = 0;
1287     fh->ino = ino;
1288     fh->handle = -1;
1289     fh->changed = was_changed;
1290     fh->linear = 0;
1291     fh->data = NULL;
1292
1293     if (IS_LINEAR (flags))
1294     {
1295         if (VFSDATA (path_element)->linear_start)
1296         {
1297             vfs_print_message (_("Starting linear transfer..."));
1298             fh->linear = LS_LINEAR_PREOPEN;
1299         }
1300     }
1301     else
1302     {
1303         struct vfs_s_subclass *s;
1304
1305         s = VFSDATA (path_element);
1306         if (s->fh_open != NULL && s->fh_open (path_element->class, fh, flags, mode) != 0)
1307         {
1308             if (s->fh_free_data != NULL)
1309                 s->fh_free_data (fh);
1310             g_free (fh);
1311             return NULL;
1312         }
1313     }
1314
1315     if ((VFSDATA (path_element)->flags & VFS_S_USETMP) != 0 && fh->ino->localname != NULL)
1316     {
1317         fh->handle = open (fh->ino->localname, NO_LINEAR (flags), mode);
1318         if (fh->handle == -1)
1319         {
1320             g_free (fh);
1321             path_element->class->verrno = errno;
1322             return NULL;
1323         }
1324     }
1325
1326     /* i.e. we had no open files and now we have one */
1327     vfs_rmstamp (path_element->class, (vfsid) super);
1328     super->fd_usage++;
1329     fh->ino->st.st_nlink++;
1330     return fh;
1331 }
1332
1333 /* --------------------------------------------------------------------------------------------- */
1334
1335 int
1336 vfs_s_retrieve_file (struct vfs_class *me, struct vfs_s_inode *ino)
1337 {
1338     /* If you want reget, you'll have to open file with O_LINEAR */
1339     off_t total = 0;
1340     char buffer[8192];
1341     int handle;
1342     ssize_t n;
1343     off_t stat_size = ino->st.st_size;
1344     vfs_file_handler_t fh;
1345     vfs_path_t *tmp_vpath;
1346
1347     if ((MEDATA->flags & VFS_S_USETMP) == 0)
1348         return -1;
1349
1350     memset (&fh, 0, sizeof (fh));
1351
1352     fh.ino = ino;
1353     fh.handle = -1;
1354
1355     handle = vfs_mkstemps (&tmp_vpath, me->name, ino->ent->name);
1356     ino->localname = vfs_path_to_str (tmp_vpath);
1357     vfs_path_free (tmp_vpath);
1358     if (handle == -1)
1359     {
1360         me->verrno = errno;
1361         goto error_4;
1362     }
1363
1364     if (!MEDATA->linear_start (me, &fh, 0))
1365         goto error_3;
1366
1367     /* Clear the interrupt status */
1368     tty_got_interrupt ();
1369     tty_enable_interrupt_key ();
1370
1371     while ((n = MEDATA->linear_read (me, &fh, buffer, sizeof (buffer))))
1372     {
1373         int t;
1374         if (n < 0)
1375             goto error_1;
1376
1377         total += n;
1378         vfs_s_print_stats (me->name, _("Getting file"), ino->ent->name, total, stat_size);
1379
1380         if (tty_got_interrupt ())
1381             goto error_1;
1382
1383         t = write (handle, buffer, n);
1384         if (t != n)
1385         {
1386             if (t == -1)
1387                 me->verrno = errno;
1388             goto error_1;
1389         }
1390     }
1391     MEDATA->linear_close (me, &fh);
1392     close (handle);
1393
1394     tty_disable_interrupt_key ();
1395     g_free (fh.data);
1396     return 0;
1397
1398   error_1:
1399     MEDATA->linear_close (me, &fh);
1400   error_3:
1401     tty_disable_interrupt_key ();
1402     close (handle);
1403     unlink (ino->localname);
1404   error_4:
1405     g_free (ino->localname);
1406     ino->localname = NULL;
1407     g_free (fh.data);
1408     return -1;
1409 }
1410
1411 /* --------------------------------------------------------------------------------------------- */
1412 /* ----------------------------- Stamping support -------------------------- */
1413
1414 /* Initialize one of our subclasses - fill common functions */
1415 void
1416 vfs_s_init_class (struct vfs_class *vclass, struct vfs_s_subclass *sub)
1417 {
1418     vclass->data = sub;
1419     vclass->fill_names = vfs_s_fill_names;
1420     vclass->open = vfs_s_open;
1421     vclass->close = vfs_s_close;
1422     vclass->read = vfs_s_read;
1423     if (!(sub->flags & VFS_S_READONLY))
1424     {
1425         vclass->write = vfs_s_write;
1426     }
1427     vclass->opendir = vfs_s_opendir;
1428     vclass->readdir = vfs_s_readdir;
1429     vclass->closedir = vfs_s_closedir;
1430     vclass->stat = vfs_s_stat;
1431     vclass->lstat = vfs_s_lstat;
1432     vclass->fstat = vfs_s_fstat;
1433     vclass->readlink = vfs_s_readlink;
1434     vclass->chdir = vfs_s_chdir;
1435     vclass->ferrno = vfs_s_ferrno;
1436     vclass->lseek = vfs_s_lseek;
1437     vclass->getid = vfs_s_getid;
1438     vclass->nothingisopen = vfs_s_nothingisopen;
1439     vclass->free = vfs_s_free;
1440     if ((sub->flags & VFS_S_USETMP) != 0)
1441     {
1442         vclass->getlocalcopy = vfs_s_getlocalcopy;
1443         vclass->ungetlocalcopy = vfs_s_ungetlocalcopy;
1444         sub->find_entry = vfs_s_find_entry_linear;
1445     }
1446     else if ((sub->flags & VFS_S_REMOTE) != 0)
1447         sub->find_entry = vfs_s_find_entry_linear;
1448     else
1449         sub->find_entry = vfs_s_find_entry_tree;
1450     vclass->setctl = vfs_s_setctl;
1451     sub->dir_uptodate = vfs_s_dir_uptodate;
1452 }
1453
1454 /* --------------------------------------------------------------------------------------------- */
1455 /** Find VFS id for given directory name */
1456
1457 vfsid
1458 vfs_getid (const vfs_path_t * vpath)
1459 {
1460     const vfs_path_element_t *path_element;
1461
1462     path_element = vfs_path_get_by_index (vpath, -1);
1463     if (!vfs_path_element_valid (path_element) || path_element->class->getid == NULL)
1464         return NULL;
1465
1466     return (*path_element->class->getid) (vpath);
1467 }
1468
1469 /* --------------------------------------------------------------------------------------------- */
1470 /* ----------- Utility functions for networked filesystems  -------------- */
1471
1472 #ifdef ENABLE_VFS_NET
1473 int
1474 vfs_s_select_on_two (int fd1, int fd2)
1475 {
1476     fd_set set;
1477     struct timeval time_out;
1478     int v;
1479     int maxfd = (fd1 > fd2 ? fd1 : fd2) + 1;
1480
1481     time_out.tv_sec = 1;
1482     time_out.tv_usec = 0;
1483     FD_ZERO (&set);
1484     FD_SET (fd1, &set);
1485     FD_SET (fd2, &set);
1486     v = select (maxfd, &set, 0, 0, &time_out);
1487     if (v <= 0)
1488         return v;
1489     if (FD_ISSET (fd1, &set))
1490         return 1;
1491     if (FD_ISSET (fd2, &set))
1492         return 2;
1493     return -1;
1494 }
1495
1496 /* --------------------------------------------------------------------------------------------- */
1497
1498 int
1499 vfs_s_get_line (struct vfs_class *me, int sock, char *buf, int buf_len, char term)
1500 {
1501     FILE *logfile = MEDATA->logfile;
1502     int i;
1503     char c;
1504
1505     for (i = 0; i < buf_len - 1; i++, buf++)
1506     {
1507         if (read (sock, buf, sizeof (char)) <= 0)
1508             return 0;
1509         if (logfile)
1510         {
1511             size_t ret1;
1512             int ret2;
1513             ret1 = fwrite (buf, 1, 1, logfile);
1514             ret2 = fflush (logfile);
1515         }
1516         if (*buf == term)
1517         {
1518             *buf = 0;
1519             return 1;
1520         }
1521     }
1522
1523     /* Line is too long - terminate buffer and discard the rest of line */
1524     *buf = 0;
1525     while (read (sock, &c, sizeof (c)) > 0)
1526     {
1527         if (logfile)
1528         {
1529             size_t ret1;
1530             int ret2;
1531             ret1 = fwrite (&c, 1, 1, logfile);
1532             ret2 = fflush (logfile);
1533         }
1534         if (c == '\n')
1535             return 1;
1536     }
1537     return 0;
1538 }
1539
1540 /* --------------------------------------------------------------------------------------------- */
1541
1542 int
1543 vfs_s_get_line_interruptible (struct vfs_class *me, char *buffer, int size, int fd)
1544 {
1545     int n;
1546     int i;
1547
1548     (void) me;
1549
1550     tty_enable_interrupt_key ();
1551     for (i = 0; i < size - 1; i++)
1552     {
1553         n = read (fd, buffer + i, 1);
1554         tty_disable_interrupt_key ();
1555         if (n == -1 && errno == EINTR)
1556         {
1557             buffer[i] = 0;
1558             return EINTR;
1559         }
1560         if (n == 0)
1561         {
1562             buffer[i] = 0;
1563             return 0;
1564         }
1565         if (buffer[i] == '\n')
1566         {
1567             buffer[i] = 0;
1568             return 1;
1569         }
1570     }
1571     buffer[size - 1] = 0;
1572     return 0;
1573 }
1574 #endif /* ENABLE_VFS_NET */
1575
1576 /* --------------------------------------------------------------------------------------------- */
1577 /**
1578  * Normalize filenames start position
1579  */
1580
1581 void
1582 vfs_s_normalize_filename_leading_spaces (struct vfs_s_inode *root_inode, size_t final_num_spaces)
1583 {
1584     GList *iter;
1585
1586     for (iter = root_inode->subdir; iter != NULL; iter = g_list_next (iter))
1587     {
1588         struct vfs_s_entry *entry = (struct vfs_s_entry *) iter->data;
1589         if ((size_t) entry->ino->data_offset > final_num_spaces)
1590         {
1591             char *source_name = entry->name;
1592             char *spacer = g_strnfill (entry->ino->data_offset - final_num_spaces, ' ');
1593             entry->name = g_strdup_printf ("%s%s", spacer, source_name);
1594             g_free (spacer);
1595             g_free (source_name);
1596         }
1597         entry->ino->data_offset = -1;
1598     }
1599 }
1600
1601 /* --------------------------------------------------------------------------------------------- */