summaryrefslogtreecommitdiff
path: root/utils/mount.c
blob: 5fa35bc445a1f9ba55ce4eb3708bc8a48f8d87eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
/* Roughly Unix/Linux-compatible `mount' frontend for Hurd translators.

   Copyright (C) 1999, 2004, 2013 Free Software Foundation, Inc.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "../sutils/fstab.h"
#include <argp.h>
#include <argz.h>
#include <error.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <hurd/fsys.h>
#include <hurd/fshelp.h>
#include <hurd/paths.h>
#ifdef HAVE_BLKID
#include <blkid/blkid.h>
#endif

#include "match-options.h"

#define SEARCH_FMTS	_HURD "%sfs\0" _HURD "%s"
#define DEFAULT_FSTYPE	"auto"

static char *fstype = DEFAULT_FSTYPE;
static char *device, *mountpoint;
static int verbose;
static int fake;
static char *options;
static size_t options_len;
static mach_msg_timeout_t timeout;

static enum { mount, query } mode;
static enum { qf_standard, qf_fstab, qf_translator } query_format;
static struct fstab_argp_params fstab_params;


static const struct argp_option argp_opts[] =
{
  {"timeout",	'T',	"MILLISECONDS",	0, "Timeout for translator startup"},
  {"format",	'p',	"mount|fstab|translator", OPTION_ARG_OPTIONAL,
   "Output format for query (no filesystem arguments)"},
  {"options", 'o', "OPTIONS", 0, "A `,' separated list of options"},
  {"readonly", 'r', 0, 0, "Never write to disk or allow opens for writing"},
  {"writable", 'w', 0, 0, "Use normal read/write behavior"},
  {"update", 'u', 0, 0, "Flush any meta-data cached in core"},
  {"remount", 0, 0, OPTION_ALIAS},
  {"verbose", 'v', 0, 0, "Give more detailed information"},
  {"no-mtab", 'n', 0, 0, "Do not update /etc/mtab"},
  {"test-opts", 'O', "OPTIONS", 0,
   "Only mount fstab entries matching the given set of options"},
  {"bind", 'B', 0, 0, "Bind mount, firmlink"},
  {"firmlink", 0, 0, OPTION_ALIAS},
  {"fake", 'f', 0, 0, "Do not actually mount, just pretend"},
  {0, 0}
};

static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  struct fstab_argp_params *params = state->input;
  error_t err;
  switch (key)
    {
    case ARGP_KEY_INIT:
      state->child_inputs[0] = params; /* pass down to fstab_argp parser */
      break;

#define ARGZ(call)							      \
      err = argz_##call; 						      \
      if (err)								      \
	argp_failure (state, 100, ENOMEM, "%s", arg);			      \
      break
    case 'r': ARGZ (add (&options, &options_len, "ro"));
    case 'w': ARGZ (add (&options, &options_len, "rw"));
    case 'u': ARGZ (add (&options, &options_len, "update"));
    case 'B': ARGZ (add (&options, &options_len, "bind"));
    case 'o': ARGZ (add_sep (&options, &options_len, arg, ','));
    case 'v': ++verbose; break;
#undef ARGZ

    case 'T':
      {
	char *end;
	unsigned long int ms = strtoul (arg, &end, 10);
	if (end && *end == '\0')
	  timeout = ms;
	else
	  {
	    argp_error (state,
			"--timeout needs a numeric argument (milliseconds)");
	    return EINVAL;
	  }
      }
      break;

    case 'p':
      if (arg == 0 || !strcasecmp (arg, "fstab"))
	query_format = qf_fstab;
      else if (!strcasecmp (arg, "mount"))
	query_format = qf_standard;
      else if (!strcasecmp (arg, "translator")
	       || !strcasecmp (arg, "showtrans"))
	query_format = qf_translator;
      else
	{
	  argp_error (state, "invalid argument to --format");
	  return EINVAL;
	}
      break;

    case 'n':
      /* do nothing */
      break;

    case 'f':
      fake = 1;
      break;

    case 'O':
      err = argz_create_sep (arg, ',', &test_opts, &test_opts_len);
      if (err)
	argp_failure (state, 100, ENOMEM, "%s", arg);
      break;

    case ARGP_KEY_ARG:
      if (mountpoint == 0)	/* One arg: mountpoint */
	mountpoint = arg;
      else if (device == 0)	/* Two args: device, mountpoint */
	{
	  device = mountpoint;
	  mountpoint = arg;
	}
      else			/* More than two args.  */
	{
	  argp_error (state, "too many arguments");
	  return EINVAL;
	}
      break;

    case ARGP_KEY_NO_ARGS:
      if (! params->do_all)
	{
	  params->do_all = 1;
	  mode = query;
	}
      break;

    case ARGP_KEY_END:
      if (params->do_all && mountpoint)
	{
	  argp_error (state, "filesystem argument not allowed with --all");
	  return EINVAL;
	}
      if (mode == query && options_len != 0)
	{
	  argp_error (state,
		      "mount options not allowed without filesystem argument");
	  return EINVAL;
	}
      if (mountpoint)
	switch (argz_count (params->types, params->types_len))
	  {
	  default:
	    argp_error (state,
			"multiple types not allowed with filesystem argument");
	    return EINVAL;
	  case 1:
	    fstype = params->types;
	    params->types = 0;
	    params->types_len = 0;
	    break;
	  case 0:
	    break;
	  }
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}

static const char doc[] = "Start active filesystem translators";
static const char args_doc[] = "\
DEVICE\t(in " _PATH_MNTTAB ")\n\
DIRECTORY\t(in " _PATH_MNTTAB ")\n\
[-t TYPE] DEVICE DIRECTORY\n\
-a";
static const struct argp_child argp_kids[] =
{ { &fstab_argp, 0,
    "Filesystem selection (if no explicit filesystem arguments given):", 2 },
  { 0 } };
static struct argp argp = { argp_opts, parse_opt, args_doc, doc, argp_kids };

/* Mount one filesystem.  */
static error_t
do_mount (struct fs *fs, int remount)
{
  error_t err;
  char *fsopts, *o;
  size_t fsopts_len;
  char *mntopts;
  size_t mntopts_len;
  fsys_t mounted;

  inline void explain (const char *command)
    {
      if (verbose)
	{
	  const char *o;
	  printf ("%s %s", command, fs->mntent.mnt_dir);
	  for (o = fsopts; o; o = argz_next (fsopts, fsopts_len, o))
	    printf (" %s", o);
	  putchar ('\n');
	}
    }

  err = fs_fsys (fs, &mounted);
  if (err)
    {
      error (0, err, "cannot determine if %s is already mounted",
	     fs->mntent.mnt_fsname);
      return err;
    }


  /* Produce an argz of translator option arguments from the
     given FS's options and the command-line options.  */

#define ARGZ(call)							      \
  err = argz_##call;							      \
  if (err)								      \
    error (3, ENOMEM, "collecting mount options");			      \

  if (fs->mntent.mnt_opts)
    {
      /* Append the fstab options to any specified on the command line.  */
      ARGZ (create_sep (fs->mntent.mnt_opts, ',', &mntopts, &mntopts_len));

      /* Remove the `noauto' and `bind' options, since they're for us not the
         filesystem.  */
      for (o = mntopts; o; o = argz_next (mntopts, mntopts_len, o))
        {
          if (strcmp (o, MNTOPT_NOAUTO) == 0)
            argz_delete (&mntopts, &mntopts_len, o);
          if (strcmp (o, "bind") == 0)
            {
              fs->mntent.mnt_type = strdup ("firmlink");
              if (!fs->mntent.mnt_type)
                error (3, ENOMEM, "failed to allocate memory");
              argz_delete (&mntopts, &mntopts_len, o);
            }
        }

      ARGZ (append (&mntopts, &mntopts_len, options, options_len));
    }
  else
    {
      mntopts = options;
      mntopts_len = options_len;
    }

  /* Convert the list of options into a list of switch arguments.  */
  fsopts = 0;
  fsopts_len = 0;
  for (o = mntopts; o; o = argz_next (mntopts, mntopts_len, o))
    if (*o == '-')		/* Allow letter opts `-o -r,-E', BSD style.  */
      {
	ARGZ (add (&fsopts, &fsopts_len, o));
      }
    else if ((strcmp (o, "defaults") != 0) && (strlen (o) != 0))
      {
	/* Prepend `--' to the option to make a long option switch,
	   e.g. `--ro' or `--rsize=1024'.  */
	char arg[2 + strlen (o) + 1];
	arg[0] = arg[1] = '-';
	memcpy (&arg[2], o, sizeof arg - 2);
	ARGZ (add (&fsopts, &fsopts_len, arg));
      }

  if (mntopts != options)
    free (mntopts);
#undef ARGZ

  if (remount)
    {
      if (mounted == MACH_PORT_NULL)
	{
	  error (0, 0, "%s not already mounted", fs->mntent.mnt_fsname);
	  return EBUSY;
	}

      /* Send an RPC to request the new options, including --update.  */
      explain ("fsysopts");
      err = fsys_set_options (mounted, fsopts, fsopts_len, 0);
      if (err)
	error (0, err, "cannot remount %s", fs->mntent.mnt_fsname);
      return err;
    }
  else
    {
      /* Error during file lookup; we use this to avoid duplicating error
	 messages.  */
      error_t open_err = 0;
      /* The control port for any active translator we start up.  */
      fsys_t active_control;
      file_t node;		/* Port to the underlying node.  */
      struct fstype *type;

      /* The callback to start_translator opens NODE as a side effect.  */
      error_t open_node (int flags,
			 mach_port_t *underlying,
			 mach_msg_type_name_t *underlying_type,
			 task_t task, void *cookie)
	{
	  node = file_name_lookup (fs->mntent.mnt_dir,
				   flags | O_NOTRANS, 0666);
	  if (node == MACH_PORT_NULL)
	    {
	      open_err = errno;
	      return open_err;
	    }

	  *underlying = node;
	  *underlying_type = MACH_MSG_TYPE_COPY_SEND;

	  return 0;
	}

      /* Do not fail if there is an active translator if --fake is
         given. This mimics Linux mount utility more closely which
         just looks into the mtab file. */
      if (mounted != MACH_PORT_NULL && !fake)
	{
	  error (0, 0, "%s already mounted", fs->mntent.mnt_fsname);
	  return EBUSY;
	}

      if (strcmp (fs->mntent.mnt_type, "auto") == 0)
        {
#if HAVE_BLKID
          char *type =
            blkid_get_tag_value (NULL, "TYPE", fs->mntent.mnt_fsname);
          if (! type)
            {
              error (0, 0, "failed to detect file system type");
              return EFTYPE;
            }
          else
            {
	      if (strcmp (type, "vfat") == 0)
		fs->mntent.mnt_type = strdup ("fat");
	      else
		fs->mntent.mnt_type = strdup (type);
              if (! fs->mntent.mnt_type)
                error (3, ENOMEM, "failed to allocate memory");
            }
#else
	  fs->mntent.mnt_type = strdup ("ext2");
	  if (! fs->mntent.mnt_type)
	    error (3, ENOMEM, "failed to allocate memory");
#endif
        }

      err = fs_type (fs, &type);
      if (err)
	{
	  error (0, err, "%s: cannot determine filesystem type",
		 fs->mntent.mnt_fsname);
	  return err;
	}
      if (type->program == 0)
	{
	  error (0, 0, "%s: filesystem type `%s' unknown",
		 fs->mntent.mnt_fsname, type->name);
	  return EFTYPE;
	}

      /* Stick the translator program name in front of the option switches.  */
      err = argz_insert (&fsopts, &fsopts_len, fsopts, type->program);
      /* Now stick the device name on the end as the last argument.  */
      if (!err)
	err = argz_add (&fsopts, &fsopts_len, fs->mntent.mnt_fsname);
      if (err)
	error (3, ENOMEM, "collecting mount options");

      /* Now we have a translator command line argz in FSOPTS.  */

      if (fake) {
        /* Fake the translator startup. */
        mach_port_t underlying;
        mach_msg_type_name_t underlying_type;
        err = open_node (O_READ, &underlying, &underlying_type, 0, NULL);
        if (err)
          error (1, errno, "cannot mount on %s", fs->mntent.mnt_dir);

        mach_port_deallocate (mach_task_self (), underlying);

        /* See if the translator is at least executable. */
        if (access(type->program, X_OK) == -1)
          error (1, errno, "can not execute %s", type->program);

        return 0;
      }

      explain ("settrans -a");
      {
	mach_port_t ports[INIT_PORT_MAX];
	mach_port_t fds[STDERR_FILENO + 1];
	int ints[INIT_INT_MAX];
	int i;

	for (i = 0; i < INIT_PORT_MAX; i++)
	  ports[i] = MACH_PORT_NULL;
	for (i = 0; i < STDERR_FILENO + 1; i++)
	  fds[i] = MACH_PORT_NULL;
	memset (ints, 0, INIT_INT_MAX * sizeof(int));

	ports[INIT_PORT_CWDIR] = getcwdir ();
	ports[INIT_PORT_CRDIR] = getcrdir ();
	ports[INIT_PORT_AUTH] = getauth ();

	err = fshelp_start_translator_long (open_node, NULL,
					    fsopts, fsopts, fsopts_len,
					    fds, MACH_MSG_TYPE_COPY_SEND,
					    STDERR_FILENO + 1,
					    ports, MACH_MSG_TYPE_COPY_SEND,
					    INIT_PORT_MAX,
					    ints, INIT_INT_MAX,
					    geteuid (),
					    timeout, &active_control);
	for (i = 0; i < INIT_PORT_MAX; i++)
	  mach_port_deallocate (mach_task_self (), ports[i]);
	for (i = 0; i <= STDERR_FILENO; i++)
	  mach_port_deallocate (mach_task_self (), fds[i]);
      }
      /* If ERR is due to a problem opening the translated node, we print
	 that name, otherwise, the name of the translator.  */
      if (open_err)
	error (0, open_err, "cannot mount on %s", fs->mntent.mnt_dir);
      else if (err)
	error (0, err, "cannot start translator %s", fsopts);
      else
	{
	  err = file_set_translator (node, 0, FS_TRANS_SET|FS_TRANS_EXCL, 0,
				     0, 0,
				     active_control, MACH_MSG_TYPE_COPY_SEND);
	  if (err == EBUSY)
	    error (0, 0, "%s already mounted on", fs->mntent.mnt_dir);
	  else if (err)
	    error (0, err, "cannot set translator on %s", fs->mntent.mnt_dir);
	  if (err)
	    fsys_goaway (active_control, FSYS_GOAWAY_FORCE);
	  mach_port_deallocate (mach_task_self (), active_control);
	}

      return err;
    }
}

/* Report the state of one filesystem to stdout.  */
static error_t
do_query (struct fs *fs)
{
  error_t err;
  fsys_t fsys;
  char _opts[200], *opts = _opts;
  size_t opts_len = sizeof opts;
  size_t nopts;

  err = fs_fsys (fs, &fsys);
  if (err)
    return err;

  if (fsys == MACH_PORT_NULL)
    /* This filesystem is not mounted.  Nothing to report.  */
    return 0;

  err = fsys_get_options (fsys, &opts, &opts_len);
  if (err)
    {
      error (0, err, "%s: cannot get filesystem options",
	     fs->mntent.mnt_fsname);
      return err;
    }

  nopts = argz_count (opts, opts_len);
  if (nopts == 0)
    {
      error (0, 0, "%s: fsys_get_options returned empty string",
	     fs->mntent.mnt_dir);
      return EGRATUITOUS;
    }

  if (query_format == qf_translator)
    {
      argz_stringify (opts, opts_len, ' ');
      printf ("%s: %s\n", fs->mntent.mnt_dir, opts);
    }
  else
    {
      char *argv[nopts];
      const char *prog, *device;

      inline const char *fsopt_string (const char *opt) /* canonicalize */
	{
	  if (opt[0] == '-' && opt[1] == '-')
	    {
	      opt += 2;
	      if (!strcmp (opt, "readonly"))
		return "ro";
	      if (!strcmp (opt, "writable"))
		return "rw";
	    }
	  else
	    {
	      if (!strcmp (opt, "-r"))
		return "ro";
	      if (!strcmp (opt, "-w"))
		return "rw";
	    }
	  return opt;
	}
      inline void print_prog (const char *sfx)
	{
	  if (!strncmp (_HURD, prog, sizeof _HURD - 1))
	    {
	      const char *type = &prog[sizeof _HURD - 1];
	      size_t len = strlen (type);
	      if (!strcmp (&type[len - 2], "fs"))
		printf ("%.*s%s", (int) (len - 2), type, sfx);
	      else
		printf ("%s%s", type, sfx);
	    }
	  else
	    printf ("%s%s", prog, sfx);
	}
      inline int print_opts (char sep)
	{
	  char *opt = argz_next (opts, opts_len, prog);
	  if (opt == 0)
	    return 0;
	  fputs (fsopt_string (opt), stdout);
	  while ((opt = argz_next (opts, opts_len, opt)) != 0)
	    printf ("%c%s", sep, fsopt_string (opt));
	  return 1;
	}

      argz_extract (opts, opts_len, argv);
      prog = argv[0];

      if (nopts < 2)
	device = fs->mntent.mnt_fsname;
      else
	{
	  static const char type_opt[] = "--store-type=";
	  device = argv[--nopts];
	  opts_len -= strlen (device) + 1;
	  if (!strncmp (type_opt, argv[nopts - 1], sizeof type_opt - 1))
	    {
	      asprintf ((char **) &device, "%s:%s",
			&argv[nopts - 1][sizeof type_opt - 1], device);
	      opts_len -= strlen (argv[nopts - 1]) + 1;
	    }
	}

      switch (query_format)
	{
	case qf_standard:
	  printf ("%s on %s type ", device, fs->mntent.mnt_dir);
	  print_prog (" (");
	  if (print_opts (','))
	    puts (")");
	  else
	    puts ("defaults)");
	  break;

	case qf_fstab:
	  printf ("%s\t%s\t", device, fs->mntent.mnt_dir);
	  print_prog ("\t");
	  printf ("%s\t%d %d\n",
		  print_opts (',') ? "" : "defaults",
		  fs->mntent.mnt_freq, fs->mntent.mnt_passno);
	  break;

	case qf_translator:	/* impossible */
	  break;
	}
    }

  return 0;
}

int
main (int argc, char **argv)
{
  unsigned int remount, firmlink;
  struct fstab *fstab;
  struct fs *fs;
  error_t err;

  argp_parse (&argp, argc, argv, 0, 0, &fstab_params);

  if (!mountpoint && (fstab_params.types == 0

		      || !strncasecmp (fstab_params.types, "no", 2)))
    {
      /* Always add the type "swap" to the list of types to exclude.  */
      err = argz_add (&fstab_params.types, &fstab_params.types_len,
		      "no"MNTTYPE_SWAP);
      if (err)
	error (3, ENOMEM, "parsing arguments");
    }

  fstab = fstab_argp_create (&fstab_params, SEARCH_FMTS, sizeof SEARCH_FMTS);

  /* This is a convenient way of checking for any `remount' options.  */
  remount = 0;
  err = argz_replace (&options, &options_len, "remount", "update", &remount);
  if (err)
    error (3, ENOMEM, "collecting mount options");

  /* Do not pass `bind' option to firmlink translator */
  char *opt = NULL;
  firmlink = 0;
  while ((opt = argz_next (options, options_len, opt)))
    if (strcmp (opt, "bind") == 0)
      {
        firmlink = 1;
        argz_delete(&options, &options_len, opt);
      }

  if (device)			/* two-argument form */
    {
      struct mntent m =
      {
	mnt_fsname: device,
	mnt_dir: mountpoint,
	mnt_type: fstype,
	mnt_opts: 0,
	mnt_freq: 0, mnt_passno: 0
      };
      if (firmlink)
        m.mnt_type = strdup ("firmlink");

      err = fstab_add_mntent (fstab, &m, &fs);
      if (err)
	error (2, err, "%s", mountpoint);
    }
  else if (mountpoint && remount)	/* one-argument remount */
    {
      struct mntent m =
      {
	mnt_fsname: mountpoint, /* since we cannot know the device,
				   using mountpoint here leads to more
				   helpful error messages */
	mnt_dir: mountpoint,
	mnt_type: fstype,
	mnt_opts: 0,
	mnt_freq: 0, mnt_passno: 0
      };
      if (firmlink)
        m.mnt_type = strdup ("firmlink");

      err = fstab_add_mntent (fstab, &m, &fs);
      if (err)
	error (2, err, "%s", mountpoint);
    }
  else if (mountpoint)		/* one-argument form */
    {
      fs = fstab_find (fstab, mountpoint);
      if (!fs)
	error (2, 0, "%s: Unknown device or filesystem", mountpoint);
    }
  else
    fs = 0;

  if (fs != 0)
    err = do_mount (fs, remount);
  else
    switch (mode)
      {
      case mount:
	for (fs = fstab->entries; fs; fs = fs->next)
	  {
	    if (fstab_params.do_all) {
              if (hasmntopt (&fs->mntent, MNTOPT_NOAUTO))
                continue;

              if (! match_options (&fs->mntent))
                continue;

              fsys_t mounted;
              err = fs_fsys (fs, &mounted);
              if (err)
                  error (0, err, "cannot determine if %s is already mounted",
                         fs->mntent.mnt_fsname);

              if (mounted != MACH_PORT_NULL)
                continue;
            }
	    err |= do_mount (fs, remount);
	  }
	break;

      case query:
	for (fs = fstab->entries; fs; fs = fs->next)
	  err |= do_query (fs);
	break;
      }

  return err ? 1 : 0;
}