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-rw-r--r--busybox/util-linux/mount.c497
1 files changed, 497 insertions, 0 deletions
diff --git a/busybox/util-linux/mount.c b/busybox/util-linux/mount.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini mount implementation for busybox
4 *
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
23 * searches through fstab when -a is passed
24 * will try mounting stuff with all fses when passed -t auto
25 *
26 * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
27 *
28 * 1999-10-07 Erik Andersen <andersen@codepoet.org>.
29 * Rewrite of a lot of code. Removed mtab usage (I plan on
30 * putting it back as a compile-time option some time),
31 * major adjustments to option parsing, and some serious
32 * dieting all around.
33 *
34 * 1999-11-06 mtab support is back - andersee
35 *
36 * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
37 * mount to add loop support.
38 *
39 * 2000-04-30 Dave Cinege <dcinege@psychosis.com>
40 * Rewrote fstab while loop and lower mount section. Can now do
41 * single mounts from fstab. Can override fstab options for single
42 * mount. Common mount_one call for single mounts and 'all'. Fixed
43 * mtab updating and stale entries. Removed 'remount' default.
44 *
45 */
46
47#include <limits.h>
48#include <stdlib.h>
49#include <unistd.h>
50#include <errno.h>
51#include <string.h>
52#include <stdio.h>
53#include <mntent.h>
54#include <ctype.h>
55#include "busybox.h"
56
57#ifdef CONFIG_NFSMOUNT
58#if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
59#error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
60#endif
61#endif
62
63enum {
64 MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
65 MS_RDONLY = 1, /* Mount read-only */
66 MS_NOSUID = 2, /* Ignore suid and sgid bits */
67 MS_NODEV = 4, /* Disallow access to device special files */
68 MS_NOEXEC = 8, /* Disallow program execution */
69 MS_SYNCHRONOUS = 16, /* Writes are synced at once */
70 MS_REMOUNT = 32, /* Alter flags of a mounted FS */
71 MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
72 S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
73 S_APPEND = 256, /* Append-only file */
74 S_IMMUTABLE = 512, /* Immutable file */
75 MS_NOATIME = 1024, /* Do not update access times. */
76 MS_NODIRATIME = 2048, /* Do not update directory access times */
77 MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
78 MS_MOVE = 8192, /* Use the new linux 2.4.x "mount --move" feature */
79};
80
81
82#if defined CONFIG_FEATURE_MOUNT_LOOP
83#include <fcntl.h>
84#include <sys/ioctl.h>
85static int use_loop = FALSE;
86#endif
87
88extern int mount(__const char *__special_file, __const char *__dir,
89 __const char *__fstype, unsigned long int __rwflag,
90 __const void *__data);
91extern int umount(__const char *__special_file);
92extern int umount2(__const char *__special_file, int __flags);
93
94extern int sysfs(int option, unsigned int fs_index, char *buf);
95
96struct mount_options {
97 const char *name;
98 unsigned long and;
99 unsigned long or;
100};
101
102static const struct mount_options mount_options[] = {
103 {"async", ~MS_SYNCHRONOUS, 0},
104 {"atime", ~0, ~MS_NOATIME},
105 {"defaults", ~0, 0},
106 {"noauto", ~0, 0},
107 {"dev", ~MS_NODEV, 0},
108 {"diratime", ~0, ~MS_NODIRATIME},
109 {"exec", ~MS_NOEXEC, 0},
110 {"noatime", ~0, MS_NOATIME},
111 {"nodev", ~0, MS_NODEV},
112 {"nodiratime", ~0, MS_NODIRATIME},
113 {"noexec", ~0, MS_NOEXEC},
114 {"nosuid", ~0, MS_NOSUID},
115 {"remount", ~0, MS_REMOUNT},
116 {"ro", ~0, MS_RDONLY},
117 {"rw", ~MS_RDONLY, 0},
118 {"suid", ~MS_NOSUID, 0},
119 {"sync", ~0, MS_SYNCHRONOUS},
120 {"bind", ~0, MS_BIND},
121 {"move", ~0, MS_MOVE},
122 {0, 0, 0}
123};
124
125static int
126do_mount(char *specialfile, char *dir, char *filesystemtype, long flags,
127 void *string_flags, int useMtab, int fakeIt, char *mtab_opts,
128 int mount_all)
129{
130 int status = 0;
131
132#if defined CONFIG_FEATURE_MOUNT_LOOP
133 char *lofile = NULL;
134#endif
135
136 if (!fakeIt) {
137#if defined CONFIG_FEATURE_MOUNT_LOOP
138 if (use_loop == TRUE) {
139 int loro = flags & MS_RDONLY;
140
141 lofile = specialfile;
142
143 specialfile = find_unused_loop_device();
144 if (specialfile == NULL) {
145 bb_error_msg_and_die("Could not find a spare loop device");
146 }
147 if (set_loop(specialfile, lofile, 0, &loro)) {
148 bb_error_msg_and_die("Could not setup loop device");
149 }
150 if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
151 bb_error_msg("WARNING: loop device is read-only");
152 flags |= MS_RDONLY;
153 }
154 }
155#endif
156 status = mount(specialfile, dir, filesystemtype, flags, string_flags);
157 if (status < 0 && errno == EROFS) {
158 bb_error_msg("%s is write-protected, mounting read-only",
159 specialfile);
160 status = mount(specialfile, dir, filesystemtype, flags |=
161 MS_RDONLY, string_flags);
162 }
163 /* Don't whine about already mounted filesystems when mounting all. */
164 if (status < 0 && errno == EBUSY && mount_all) {
165 return TRUE;
166 }
167 }
168
169
170 /* If the mount was sucessful, do anything needed, then return TRUE */
171 if (status == 0 || fakeIt == TRUE) {
172
173#if defined CONFIG_FEATURE_MTAB_SUPPORT
174 if (useMtab) {
175 erase_mtab(specialfile); /* Clean any stale entries */
176 write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
177 }
178#endif
179 return (TRUE);
180 }
181
182 /* Bummer. mount failed. Clean up */
183#if defined CONFIG_FEATURE_MOUNT_LOOP
184 if (lofile != NULL) {
185 del_loop(specialfile);
186 }
187#endif
188
189 if (errno == EPERM) {
190 bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
191 }
192
193 return (FALSE);
194}
195
196
197static void paste_str(char **s1, const char *s2)
198{
199 *s1 = xrealloc(*s1, strlen(*s1) + strlen(s2) + 1);
200 strcat(*s1, s2);
201}
202
203/* Seperate standard mount options from the nonstandard string options */
204static void parse_mount_options(char *options, int *flags, char **strflags)
205{
206 while (options) {
207 int gotone = FALSE;
208 char *comma = strchr(options, ',');
209 const struct mount_options *f = mount_options;
210
211 if (comma) {
212 *comma = '\0';
213 }
214
215 while (f->name != 0) {
216 if (strcasecmp(f->name, options) == 0) {
217
218 *flags &= f->and;
219 *flags |= f->or;
220 gotone = TRUE;
221 break;
222 }
223 f++;
224 }
225#if defined CONFIG_FEATURE_MOUNT_LOOP
226 if (!strcasecmp("loop", options)) { /* loop device support */
227 use_loop = TRUE;
228 gotone = TRUE;
229 }
230#endif
231 if (!gotone) {
232 if (**strflags) {
233 /* have previous parsed options */
234 paste_str(strflags, ",");
235 }
236 paste_str(strflags, options);
237 }
238 if (comma) {
239 *comma = ',';
240 options = ++comma;
241 } else {
242 break;
243 }
244 }
245}
246
247static int mount_one(char *blockDevice, char *directory, char *filesystemType,
248 unsigned long flags, char *string_flags, int useMtab,
249 int fakeIt, char *mtab_opts, int whineOnErrors,
250 int mount_all)
251{
252 int status = 0;
253 if (strcmp(filesystemType, "auto") == 0) {
254 char buf[255];
255 FILE *f;
256 int read_proc = 0;
257
258 f = fopen("/etc/filesystems", "r");
259
260 if (f) {
261 while (fgets(buf, sizeof(buf), f)) {
262 if (*buf == '*') {
263 read_proc = 1;
264 } else if (*buf == '#') {
265 continue;
266 } else {
267 filesystemType = buf;
268
269 /* Add NULL termination to each line */
270 while (*filesystemType && !isspace(*filesystemType)) {
271 filesystemType++;
272 }
273 *filesystemType = '\0';
274
275 filesystemType = buf;
276
277 if (bb_strlen(filesystemType)) {
278 status = do_mount(blockDevice, directory, filesystemType,
279 flags | MS_MGC_VAL, string_flags,
280 useMtab, fakeIt, mtab_opts, mount_all);
281 if (status) {
282 break;
283 }
284 }
285
286 }
287 }
288 fclose(f);
289 } else {
290 read_proc = 1;
291 }
292
293 if (read_proc && !status) {
294
295 f = bb_xfopen("/proc/filesystems", "r");
296
297 while (fgets(buf, sizeof(buf), f) != NULL) {
298 filesystemType = buf;
299 if (*filesystemType == '\t') { /* Not a nodev filesystem */
300
301 /* Add NULL termination to each line */
302 while (*filesystemType && *filesystemType != '\n') {
303 filesystemType++;
304 }
305 *filesystemType = '\0';
306
307 filesystemType = buf;
308 filesystemType++; /* hop past tab */
309
310 status = do_mount(blockDevice, directory, filesystemType,
311 flags | MS_MGC_VAL, string_flags, useMtab,
312 fakeIt, mtab_opts, mount_all);
313 if (status) {
314 break;
315 }
316 }
317 }
318 fclose(f);
319 }
320 } else {
321 status = do_mount(blockDevice, directory, filesystemType,
322 flags | MS_MGC_VAL, string_flags, useMtab, fakeIt,
323 mtab_opts, mount_all);
324 }
325
326 if (!status) {
327 if (whineOnErrors) {
328 bb_perror_msg("Mounting %s on %s failed", blockDevice, directory);
329 }
330 return (FALSE);
331 }
332 return (TRUE);
333}
334
335static void show_mounts(char *onlytype)
336{
337 FILE *mountTable = setmntent(bb_path_mtab_file, "r");
338
339 if (mountTable) {
340 struct mntent *m;
341
342 while ((m = getmntent(mountTable)) != 0) {
343 char *blockDevice = m->mnt_fsname;
344
345 if (strcmp(blockDevice, "rootfs") == 0) {
346 continue;
347 } else if (strcmp(blockDevice, "/dev/root") == 0) {
348 blockDevice = find_real_root_device_name();
349 }
350 if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
351 printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
352 m->mnt_type, m->mnt_opts);
353 }
354#ifdef CONFIG_FEATURE_CLEAN_UP
355 if (blockDevice != m->mnt_fsname) {
356 free(blockDevice);
357 }
358#endif
359 }
360 endmntent(mountTable);
361 } else {
362 bb_perror_msg_and_die(bb_path_mtab_file);
363 }
364 exit(EXIT_SUCCESS);
365}
366
367extern int mount_main(int argc, char **argv)
368{
369 struct stat statbuf;
370 char *string_flags = bb_xstrdup("");
371 char *extra_opts;
372 int flags = 0;
373 char *filesystemType = "auto";
374 int got_filesystemType = 0;
375 char *device = xmalloc(PATH_MAX);
376 char *directory = xmalloc(PATH_MAX);
377 struct mntent *m = NULL;
378 int all = FALSE;
379 int fakeIt = FALSE;
380 int useMtab = TRUE;
381 int rc = EXIT_FAILURE;
382 FILE *f = 0;
383 int opt;
384
385 /* Parse options */
386 while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
387 switch (opt) {
388 case 'o':
389 parse_mount_options(optarg, &flags, &string_flags);
390 break;
391 case 'r':
392 flags |= MS_RDONLY;
393 break;
394 case 't':
395 filesystemType = optarg;
396 got_filesystemType = 1;
397 break;
398 case 'w':
399 flags &= ~MS_RDONLY;
400 break;
401 case 'a':
402 all = TRUE;
403 break;
404 case 'f':
405 fakeIt = TRUE;
406 break;
407 case 'n':
408#ifdef CONFIG_FEATURE_MTAB_SUPPORT
409 useMtab = FALSE;
410#endif
411 break;
412 case 'v':
413 break; /* ignore -v */
414 }
415 }
416
417 if (!all && (optind == argc)) {
418 show_mounts(got_filesystemType ? filesystemType : NULL);
419 }
420
421 if (optind < argc) {
422 /* if device is a filename get its real path */
423 if (stat(argv[optind], &statbuf) == 0) {
424 char *tmp = bb_simplify_path(argv[optind]);
425
426 safe_strncpy(device, tmp, PATH_MAX);
427 } else {
428 safe_strncpy(device, argv[optind], PATH_MAX);
429 }
430 }
431
432 if (optind + 1 < argc)
433 directory = bb_simplify_path(argv[optind + 1]);
434
435 if (all || optind + 1 == argc) {
436 f = setmntent("/etc/fstab", "r");
437
438 if (f == NULL)
439 bb_perror_msg_and_die("\nCannot read /etc/fstab");
440
441 while ((m = getmntent(f)) != NULL) {
442 if (!all && (optind + 1 == argc)
443 && ((strcmp(device, m->mnt_fsname) != 0)
444 && (strcmp(device, m->mnt_dir) != 0))) {
445 continue;
446 }
447
448 if (all && ( /* If we're mounting 'all' */
449 (strstr(m->mnt_opts, "noauto")) || /* and the file system isn't noauto, */
450 (strstr(m->mnt_type, "swap")))) /* and isn't swap, then mount it */
451 {
452 continue;
453 }
454
455 if (all || flags == 0) { /* Allow single mount to override fstab flags */
456 flags = 0;
457 string_flags[0] = 0;
458 parse_mount_options(m->mnt_opts, &flags, &string_flags);
459 }
460
461 strcpy(device, m->mnt_fsname);
462 strcpy(directory, m->mnt_dir);
463 filesystemType = bb_xstrdup(m->mnt_type);
464 singlemount:
465 extra_opts = string_flags;
466 rc = EXIT_SUCCESS;
467#ifdef CONFIG_NFSMOUNT
468 if (strchr(device, ':') != NULL) {
469 filesystemType = "nfs";
470 if (nfsmount
471 (device, directory, &flags, &extra_opts, &string_flags,
472 1)) {
473 bb_perror_msg("nfsmount failed");
474 rc = EXIT_FAILURE;
475 }
476 }
477#endif
478 if (!mount_one
479 (device, directory, filesystemType, flags, string_flags,
480 useMtab, fakeIt, extra_opts, TRUE, all)) {
481 rc = EXIT_FAILURE;
482 }
483 if (!all) {
484 break;
485 }
486 }
487 if (f) {
488 endmntent(f);
489 }
490 if (!all && f && m == NULL) {
491 fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
492 }
493 return rc;
494 }
495
496 goto singlemount;
497}
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