blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html

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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Testing if a file system can be used for home directories...</div>
  24       <div class="date"> 8th August 2010</div>
  25       <div class="body"><p>A few years ago, I was involved in a project planning to use
  26 Windows file servers as home directory servers for Debian
  27 Edu/Skolelinux machines.  This was thought to be no problem, as the
  28 access would be through the SMB network file system protocol, and we
  29 knew other sites used SMB with unix and samba as the file server to
  30 mount home directories without any problems.  But, after months of
  31 struggling, we had to conclude that our goal was impossible.</p>
  32
  33 <p>The reason is simply that while SMB can be used for home
  34 directories when the file server is Samba running on Unix, this only
  35 work because of Samba have some extensions and the fact that the
  36 underlying file system is a unix file system.  When using a Windows
  37 file server, the underlying file system do not have POSIX semantics,
  38 and several programs will fail if the users home directory where they
  39 want to store their configuration lack POSIX semantics.</p>
  40
  41 <p>As part of this work, I wrote a small C program I want to share
  42 with you all, to replicate a few of the problematic applications (like
  43 OpenOffice.org and GCompris) and see if the file system was working as
  44 it should.  If you find yourself in spooky file system land, it might
  45 help you find your way out again.  This is the fs-test.c source:</p>
  46
  47 <pre>
  48 /*
  49  * Some tests to check the file system sematics.  Used to verify that
  50  * CIFS from a windows server do not work properly as a linux home
  51  * directory.
  52  * License: GPL v2 or later
  53  *
  54  * needs libsqlite3-dev and build-essential installed
  55  * compile with: gcc -Wall -lsqlite3 -DTEST_SQLITE fs-test.c -o fs-test
  56 */
  57
  58 #define _FILE_OFFSET_BITS 64
  59 #define _LARGEFILE_SOURCE 1
  60 #define _LARGEFILE64_SOURCE 1
  61
  62 #define _GNU_SOURCE /* for asprintf() */
  63
  64 #include &lt;errno.h>
  65 #include &lt;fcntl.h>
  66 #include &lt;stdio.h>
  67 #include &lt;string.h>
  68 #include &lt;stdlib.h>
  69 #include &lt;sys/file.h>
  70 #include &lt;sys/stat.h>
  71 #include &lt;sys/types.h>
  72 #include &lt;unistd.h>
  73
  74 #ifdef TEST_SQLITE
  75 /*
  76  * Test sqlite open, as done by gcompris require the libsqlite3-dev
  77  * package and linking with -lsqlite3.  A more low level test is
  78  * below.
  79  * See also &lt;URL: http://www.sqlite.org./faq.html#q5 >.
  80  */
  81 #include &lt;sqlite3.h>
  82 #define CREATE_TABLE_USERS                                              \
  83   "CREATE TABLE users (user_id INT UNIQUE, login TEXT, lastname TEXT, firstname TEXT, birthdate TEXT, class_id INT ); "
  84 int test_sqlite_open(void) {
  85   char *zErrMsg;
  86   char *name = "testsqlite.db";
  87   sqlite3 *db=NULL;
  88   unlink(name);
  89   int rc = sqlite3_open(name, &db);
  90   if( rc ){
  91     printf("error: sqlite open of %s failed: %s\n", name, sqlite3_errmsg(db));
  92     sqlite3_close(db);
  93     return -1;
  94   }
  95
  96   /* create tables */
  97   rc = sqlite3_exec(db,CREATE_TABLE_USERS, NULL,  0, &zErrMsg);
  98   if( rc != SQLITE_OK ){
  99     printf("error: sqlite table create failed: %s\n", zErrMsg);
 100     sqlite3_close(db);
 101     return -1;
 102   }
 103   printf("info: sqlite worked\n");
 104   sqlite3_close(db);
 105   return 0;
 106 }
 107 #endif /* TEST_SQLITE */
 108
 109 /*
 110  * Demonstrate locking issue found in gcompris using sqlite3.  This
 111  * work with ext3, but not with cifs server on Windows 2003.  This is
 112  * done in the sqlite3 library.
 113  * See also
 114  * &lt;URL:http://www.cygwin.com/ml/cygwin/2001-08/msg00854.html> and the
 115  * POSIX specification
 116  * &lt;URL:http://www.opengroup.org/onlinepubs/009695399/functions/fcntl.html>.
 117  */
 118 int test_gcompris_locking(void) {
 119   struct flock fl;
 120   char *name = "testsqlite.db";
 121   unlink(name);
 122   int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, 0644);
 123   printf("info: testing fcntl locking\n");
 124
 125   fl.l_whence = SEEK_SET;
 126   fl.l_pid    = getpid();
 127   printf("  Read-locking 1 byte from 1073741824");
 128   fl.l_start  = 1073741824;
 129   fl.l_len    = 1;
 130   fl.l_type   = F_RDLCK;
 131   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 132
 133   printf("  Read-locking 510 byte from 1073741826");
 134   fl.l_start  = 1073741826;
 135   fl.l_len    = 510;
 136   fl.l_type   = F_RDLCK;
 137   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 138
 139   printf("  Unlocking 1 byte from 1073741824");
 140   fl.l_start  = 1073741824;
 141   fl.l_len    = 1;
 142   fl.l_type   = F_UNLCK;
 143   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 144
 145   printf("  Write-locking 1 byte from 1073741824");
 146   fl.l_start  = 1073741824;
 147   fl.l_len    = 1;
 148   fl.l_type   = F_WRLCK;
 149   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 150
 151   printf("  Write-locking 510 byte from 1073741826");
 152   fl.l_start  = 1073741826;
 153   fl.l_len    = 510;
 154   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 155
 156   printf("  Unlocking 2 byte from 1073741824");
 157   fl.l_start  = 1073741824;
 158   fl.l_len    = 2;
 159   fl.l_type   = F_UNLCK;
 160   if (0 != fcntl(fd, F_SETLK, &fl) ) printf(" - error!\n"); else printf("\n");
 161
 162   close(fd);
 163   return 0;
 164 }
 165
 166 /*
 167  * Test if permissions of freshly created directories allow entries
 168  * below them.  This was a problem with OpenOffice.org and gcompris.
 169  * Mounting with option 'sync' seem to solve this problem while
 170  * slowing down file operations.
 171  */
 172 int test_subdirectory_creation(void) {
 173 #define LEVELS 5
 174   char *path = strdup("test");
 175   char *dirs[LEVELS];
 176   int level;
 177   printf("info: testing subdirectory creation\n");
 178   for (level = 0; level &lt; LEVELS; level++) {
 179     char *newpath = NULL;
 180     if (-1 == mkdir(path, 0777)) {
 181       printf("  error: Unable to create directory '%s': %s\n",
 182              path, strerror(errno));
 183       break;
 184     }
 185     asprintf(&newpath, "%s/%s", path, "test");
 186     free(path);
 187     path = newpath;
 188   }
 189   return 0;
 190 }
 191
 192 /*
 193  * Test if symlinks can be created.  This was a problem detected with
 194  * KDE.
 195  */
 196 int test_symlinks(void) {
 197   printf("info: testing symlink creation\n");
 198   unlink("symlink");
 199   if (-1 == symlink("file", "symlink"))
 200     printf("  error: Unable to create symlink\n");
 201   return 0;
 202 }
 203
 204 int main(int argc, char **argv) {
 205   printf("Testing POSIX/Unix sematics on file system\n");
 206   test_symlinks();
 207   test_subdirectory_creation();
 208 #ifdef TEST_SQLITE
 209   test_sqlite_open();
 210 #endif /* TEST_SQLITE */
 211   test_gcompris_locking();
 212   return 0;
 213 }
 214 </pre>
 215
 216 <p>When everything is working, it should print something like
 217 this:</p>
 218
 219 <pre>
 220 Testing POSIX/Unix sematics on file system
 221 info: testing symlink creation
 222 info: testing subdirectory creation
 223 info: sqlite worked
 224 info: testing fcntl locking
 225   Read-locking 1 byte from 1073741824
 226   Read-locking 510 byte from 1073741826
 227   Unlocking 1 byte from 1073741824
 228   Write-locking 1 byte from 1073741824
 229   Write-locking 510 byte from 1073741826
 230   Unlocking 2 byte from 1073741824
 231 </pre>
 232
 233 <p>I do not remember the exact details of the problems we saw, but one
 234 of them was with locking, where if I remember correctly, POSIX allow a
 235 read-only lock to be upgraded to a read-write lock without unlocking
 236 the read-only lock (while Windows do not).  Another was a bug in the
 237 CIFS/SMB client implementation in the Linux kernel where directory
 238 meta information would be wrong for a fraction of a second, making
 239 OpenOffice.org fail to create its deep directory tree because it was
 240 not allowed to create files in its freshly created directory.</p>
 241
 242 <p>Anyway, here is a nice tool for your tool box, might you never need
 243 it. :)</p>
 244
 245 <p>Update 2010-08-27: Michael Gebetsroither report that he found the
 246 script so useful that he created a GIT repository and stored it in
 247 <a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a>.</p>
 248 </div>
 249
 250       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.</div>
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 499
 500 </ul></li>
 501
 502 <li>2009
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 517 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 518
 519 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 520
 521 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 522
 523 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 524
 525 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 526
 527 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 528
 529 </ul></li>
 530
 531 <li>2008
 532 <ul>
 533
 534 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 535
 536 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 537
 538 </ul></li>
 539
 540 </ul>
 541
 542
 543
 544 <h2>Tags</h2>
 545 <ul>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (15)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 560
 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 562
 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (155)</a></li>
 564
 565  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 566
 567  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 568
 569  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 570
 571  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 572
 573  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (24)</a></li>
 574
 575  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 576
 577  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (364)</a></li>
 578
 579  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 580
 581  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
 582
 583  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
 584
 585  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 586
 587  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
 588
 589  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 590
 591  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 592
 593  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (15)</a></li>
 594
 595  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 596
 597  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 598
 599  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 600
 601  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 602
 603  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 604
 605  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 606
 607  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 608
 609  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
 610
 611  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (9)</a></li>
 612
 613  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (294)</a></li>
 614
 615  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (190)</a></li>
 616
 617  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
 618
 619  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 620
 621  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (71)</a></li>
 622
 623  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (104)</a></li>
 624
 625  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 626
 627  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 628
 629  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 630
 631  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 632
 633  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 634
 635  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 636
 637  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
 638
 639  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 640
 641  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
 642
 643  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 644
 645  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 646
 647  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
 648
 649  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 650
 651  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 652
 653  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (52)</a></li>
 654
 655  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 656
 657  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 658
 659  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 660
 661  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (10)</a></li>
 662
 663  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (61)</a></li>
 664
 665  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 666
 667  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
 668
 669 </ul>
 670
 671
 672     </div>
 673     <p style="text-align: right">
 674  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 675 </p>
 676
 677   </body>
 678 </html>