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Commit | Line | Data |
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1bb1d80b KZ |
1 | /* |
2 | * Copyright (C) 2010 Karel Zak <kzak@redhat.com> | |
3 | * | |
4 | * This file may be redistributed under the terms of the | |
5 | * GNU Lesser General Public License. | |
6 | */ | |
7 | ||
63de90d4 KZ |
8 | /** |
9 | * SECTION: context-mount | |
10 | * @title: Mount context | |
11 | * @short_description: high-level API to mount operation. | |
12 | */ | |
13 | ||
1bb1d80b KZ |
14 | #ifdef HAVE_LIBSELINUX |
15 | #include <selinux/selinux.h> | |
16 | #include <selinux/context.h> | |
17 | #endif | |
18 | ||
19 | #include <sys/wait.h> | |
20 | #include <sys/mount.h> | |
21 | ||
de60d08e | 22 | #include "linux_version.h" |
1bb1d80b KZ |
23 | #include "mountP.h" |
24 | ||
6498ece0 KZ |
25 | /* |
26 | * Kernel supports only one MS_PROPAGATION flag change by one mount(2) syscall, | |
58c41e15 | 27 | * to bypass this restriction we call mount(2) per flag. It's really not a perfect |
6498ece0 KZ |
28 | * solution, but it's the same like to execute multiple mount(8) commands. |
29 | * | |
30 | * We use cxt->addmounts (additional mounts) list to keep order of the requested | |
31 | * flags changes. | |
32 | */ | |
33 | struct libmnt_addmount *mnt_new_addmount(void) | |
34 | { | |
35 | struct libmnt_addmount *ad = calloc(1, sizeof(*ad)); | |
36 | if (!ad) | |
37 | return NULL; | |
38 | ||
39 | INIT_LIST_HEAD(&ad->mounts); | |
40 | return ad; | |
41 | } | |
42 | ||
43 | void mnt_free_addmount(struct libmnt_addmount *ad) | |
44 | { | |
45 | if (!ad) | |
46 | return; | |
47 | list_del(&ad->mounts); | |
48 | free(ad); | |
49 | } | |
50 | ||
51 | static int mnt_context_append_additional_mount(struct libmnt_context *cxt, | |
52 | struct libmnt_addmount *ad) | |
53 | { | |
54 | assert(cxt); | |
55 | assert(ad); | |
56 | ||
57 | DBG(CXT, mnt_debug_h(cxt, | |
58 | "mount: add additional flag: 0x%08lx", | |
59 | ad->mountflags)); | |
60 | ||
61 | list_add_tail(&ad->mounts, &cxt->addmounts); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static int init_propagation(struct libmnt_context *cxt) | |
66 | { | |
67 | char *name; | |
68 | char *opts = (char *) mnt_fs_get_vfs_options(cxt->fs); | |
69 | size_t namesz; | |
70 | struct libmnt_optmap const *maps[1]; | |
71 | ||
72 | if (!opts) | |
73 | return 0; | |
74 | ||
75 | DBG(CXT, mnt_debug_h(cxt, "mount: initialize additional propagation mounts")); | |
76 | ||
77 | maps[0] = mnt_get_builtin_optmap(MNT_LINUX_MAP); | |
78 | ||
79 | while (!mnt_optstr_next_option(&opts, &name, &namesz, NULL, NULL)) { | |
80 | const struct libmnt_optmap *ent; | |
81 | struct libmnt_addmount *ad; | |
82 | int rc; | |
83 | ||
84 | if (!mnt_optmap_get_entry(maps, 1, name, namesz, &ent) | |
85 | || !ent | |
86 | || !(ent->id & MS_PROPAGATION)) | |
87 | continue; | |
88 | ||
89 | ad = mnt_new_addmount(); | |
90 | if (!ad) | |
91 | return -ENOMEM; | |
92 | ||
93 | ad->mountflags = ent->id; | |
94 | rc = mnt_context_append_additional_mount(cxt, ad); | |
95 | if (rc) | |
96 | return rc; | |
97 | ||
98 | cxt->mountflags &= ~ent->id; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
1bb1d80b KZ |
104 | /* |
105 | * this has to be called after mnt_context_evaluate_permissions() | |
106 | */ | |
68164f6c | 107 | static int fix_optstr(struct libmnt_context *cxt) |
1bb1d80b | 108 | { |
178537ed | 109 | int rc = 0; |
76a06ca4 | 110 | char *next; |
1bb1d80b KZ |
111 | char *name, *val; |
112 | size_t namesz, valsz; | |
68164f6c | 113 | struct libmnt_fs *fs; |
178537ed KZ |
114 | #ifdef HAVE_LIBSELINUX |
115 | int se_fix = 0, se_rem = 0; | |
116 | #endif | |
1b56aae8 KZ |
117 | assert(cxt); |
118 | assert(cxt->fs); | |
119 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); | |
120 | ||
1bb1d80b KZ |
121 | if (!cxt) |
122 | return -EINVAL; | |
dc4dbbf1 | 123 | if (!cxt->fs || (cxt->flags & MNT_FL_MOUNTOPTS_FIXED)) |
1bb1d80b KZ |
124 | return 0; |
125 | ||
1b56aae8 | 126 | DBG(CXT, mnt_debug_h(cxt, "mount: fixing optstr")); |
1bb1d80b | 127 | |
76a06ca4 KZ |
128 | fs = cxt->fs; |
129 | ||
e90e7401 KZ |
130 | /* |
131 | * The "user" options is our business (so we can modify the option), | |
132 | * but exception is command line for /sbin/mount.<type> helpers. Let's | |
133 | * save the original user=<name> to call the helpers with unchanged | |
134 | * "user" setting. | |
e90e7401 | 135 | */ |
4be900c5 KZ |
136 | if (cxt->user_mountflags & MNT_MS_USER) { |
137 | if (!mnt_optstr_get_option(fs->user_optstr, | |
138 | "user", &val, &valsz) && val) { | |
1bb1d80b KZ |
139 | cxt->orig_user = strndup(val, valsz); |
140 | if (!cxt->orig_user) { | |
141 | rc = -ENOMEM; | |
142 | goto done; | |
143 | } | |
144 | } | |
145 | cxt->flags |= MNT_FL_SAVED_USER; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Sync mount options with mount flags | |
150 | */ | |
6b741564 | 151 | DBG(CXT, mnt_debug_h(cxt, "mount: fixing vfs optstr")); |
76a06ca4 | 152 | rc = mnt_optstr_apply_flags(&fs->vfs_optstr, cxt->mountflags, |
1bb1d80b KZ |
153 | mnt_get_builtin_optmap(MNT_LINUX_MAP)); |
154 | if (rc) | |
155 | goto done; | |
156 | ||
6b741564 | 157 | DBG(CXT, mnt_debug_h(cxt, "mount: fixing user optstr")); |
76a06ca4 | 158 | rc = mnt_optstr_apply_flags(&fs->user_optstr, cxt->user_mountflags, |
1bb1d80b KZ |
159 | mnt_get_builtin_optmap(MNT_USERSPACE_MAP)); |
160 | if (rc) | |
161 | goto done; | |
162 | ||
6b741564 KZ |
163 | if (fs->vfs_optstr && *fs->vfs_optstr == '\0') { |
164 | free(fs->vfs_optstr); | |
165 | fs->vfs_optstr = NULL; | |
166 | } | |
167 | if (fs->user_optstr && *fs->user_optstr == '\0') { | |
168 | free(fs->user_optstr); | |
169 | fs->user_optstr = NULL; | |
170 | } | |
171 | ||
6498ece0 KZ |
172 | if (cxt->mountflags & MS_PROPAGATION) { |
173 | rc = init_propagation(cxt); | |
174 | if (rc) | |
175 | return rc; | |
176 | } | |
177 | ||
76a06ca4 | 178 | next = fs->fs_optstr; |
1bb1d80b KZ |
179 | |
180 | #ifdef HAVE_LIBSELINUX | |
de60d08e KZ |
181 | if (!is_selinux_enabled()) |
182 | /* Always remove SELinux garbage if SELinux disabled */ | |
183 | se_rem = 1; | |
184 | else if (cxt->mountflags & MS_REMOUNT) | |
185 | /* | |
186 | * Linux kernel < 2.6.39 does not allow to remount with any | |
187 | * selinux specific mount options. | |
188 | * | |
189 | * Kernel 2.6.39 commits: ff36fe2c845cab2102e4826c1ffa0a6ebf487c65 | |
190 | * 026eb167ae77244458fa4b4b9fc171209c079ba7 | |
191 | * fix this odd behavior, so we don't have to care about it in | |
192 | * userspace. | |
193 | */ | |
194 | se_rem = get_linux_version() < KERNEL_VERSION(2, 6, 39); | |
195 | else | |
45683be5 | 196 | /* For normal mount, contexts are translated */ |
de60d08e | 197 | se_fix = 1; |
f1f9a46a KZ |
198 | |
199 | if (!se_rem) { | |
200 | /* de-duplicate SELinux options */ | |
201 | mnt_optstr_deduplicate_option(&fs->fs_optstr, "context"); | |
202 | mnt_optstr_deduplicate_option(&fs->fs_optstr, "fscontext"); | |
203 | mnt_optstr_deduplicate_option(&fs->fs_optstr, "defcontext"); | |
204 | mnt_optstr_deduplicate_option(&fs->fs_optstr, "rootcontext"); | |
205 | mnt_optstr_deduplicate_option(&fs->fs_optstr, "seclabel"); | |
206 | } | |
1bb1d80b | 207 | #endif |
1bb1d80b KZ |
208 | while (!mnt_optstr_next_option(&next, &name, &namesz, &val, &valsz)) { |
209 | ||
210 | if (namesz == 3 && !strncmp(name, "uid", 3)) | |
76a06ca4 | 211 | rc = mnt_optstr_fix_uid(&fs->fs_optstr, val, valsz, &next); |
1bb1d80b | 212 | else if (namesz == 3 && !strncmp(name, "gid", 3)) |
76a06ca4 | 213 | rc = mnt_optstr_fix_gid(&fs->fs_optstr, val, valsz, &next); |
1bb1d80b | 214 | #ifdef HAVE_LIBSELINUX |
de60d08e KZ |
215 | else if ((se_rem || se_fix) && |
216 | namesz >= 7 && (!strncmp(name, "context", 7) || | |
1bb1d80b KZ |
217 | !strncmp(name, "fscontext", 9) || |
218 | !strncmp(name, "defcontext", 10) || | |
de60d08e KZ |
219 | !strncmp(name, "rootcontext", 11) || |
220 | !strncmp(name, "seclabel", 8))) { | |
221 | if (se_rem) { | |
1bb1d80b KZ |
222 | /* remove context= option */ |
223 | next = name; | |
76a06ca4 | 224 | rc = mnt_optstr_remove_option_at(&fs->fs_optstr, |
de60d08e KZ |
225 | name, |
226 | val ? val + valsz : | |
227 | name + namesz); | |
228 | } else if (se_fix && val && valsz) | |
229 | /* translate selinux contexts */ | |
76a06ca4 | 230 | rc = mnt_optstr_fix_secontext(&fs->fs_optstr, |
1bb1d80b KZ |
231 | val, valsz, &next); |
232 | } | |
233 | #endif | |
1bb1d80b KZ |
234 | if (rc) |
235 | goto done; | |
236 | } | |
237 | ||
4be900c5 | 238 | if (!rc && cxt->restricted && (cxt->user_mountflags & MNT_MS_USER)) |
5a669b12 | 239 | rc = mnt_optstr_fix_user(&fs->user_optstr); |
76a06ca4 | 240 | |
f2b3a3a3 KZ |
241 | /* refresh merged optstr */ |
242 | free(fs->optstr); | |
243 | fs->optstr = NULL; | |
244 | fs->optstr = mnt_fs_strdup_options(fs); | |
1bb1d80b | 245 | done: |
dc4dbbf1 KZ |
246 | cxt->flags |= MNT_FL_MOUNTOPTS_FIXED; |
247 | ||
76a06ca4 | 248 | DBG(CXT, mnt_debug_h(cxt, "fixed options [rc=%d]: " |
f2b3a3a3 KZ |
249 | "vfs: '%s' fs: '%s' user: '%s', optstr: '%s'", rc, |
250 | fs->vfs_optstr, fs->fs_optstr, fs->user_optstr, fs->optstr)); | |
61f5ff6c KZ |
251 | |
252 | if (rc) | |
253 | rc = -MNT_ERR_MOUNTOPT; | |
1bb1d80b KZ |
254 | return rc; |
255 | } | |
256 | ||
257 | /* | |
3cbc5a95 | 258 | * Converts already evaluated and fixed options to the form that is compatible |
63de90d4 | 259 | * with /sbin/mount.type helpers. |
1bb1d80b | 260 | */ |
68164f6c | 261 | static int generate_helper_optstr(struct libmnt_context *cxt, char **optstr) |
1bb1d80b | 262 | { |
6498ece0 | 263 | struct libmnt_optmap const *maps[2]; |
5810d870 KZ |
264 | char *next, *name, *val; |
265 | size_t namesz, valsz; | |
1bb1d80b KZ |
266 | int rc = 0; |
267 | ||
268 | assert(cxt); | |
269 | assert(cxt->fs); | |
270 | assert(optstr); | |
271 | ||
3cbc5a95 | 272 | DBG(CXT, mnt_debug_h(cxt, "mount: generate helper mount options")); |
5810d870 | 273 | |
76a06ca4 KZ |
274 | *optstr = mnt_fs_strdup_options(cxt->fs); |
275 | if (!*optstr) | |
276 | return -ENOMEM; | |
1bb1d80b | 277 | |
17206c05 KZ |
278 | if (cxt->user_mountflags & MNT_MS_USER) { |
279 | /* | |
280 | * This is unnecessary for real user-mounts as mount.<type> | |
281 | * helpers have to always follow fstab rather than mount | |
282 | * options on command line. | |
283 | * | |
284 | * But if you call mount.<type> as root then the helper follows | |
285 | * command line. If there is (for example) "user,exec" in fstab | |
286 | * then we have to manually append the "exec" back to the options | |
287 | * string, bacause there is nothing like MS_EXEC (we have only | |
288 | * MS_NOEXEC in mount flags and we don't care about the original | |
289 | * mount string in libmount for VFS options). | |
290 | */ | |
291 | if (!(cxt->mountflags & MS_NOEXEC)) | |
292 | mnt_optstr_append_option(optstr, "exec", NULL); | |
293 | if (!(cxt->mountflags & MS_NOSUID)) | |
294 | mnt_optstr_append_option(optstr, "suid", NULL); | |
295 | if (!(cxt->mountflags & MS_NODEV)) | |
296 | mnt_optstr_append_option(optstr, "dev", NULL); | |
297 | } | |
298 | ||
299 | ||
76a06ca4 | 300 | if (cxt->flags & MNT_FL_SAVED_USER) |
1bb1d80b | 301 | rc = mnt_optstr_set_option(optstr, "user", cxt->orig_user); |
5810d870 KZ |
302 | if (rc) |
303 | goto err; | |
304 | ||
305 | /* remove userspace options with MNT_NOHLPS flag */ | |
306 | maps[0] = mnt_get_builtin_optmap(MNT_USERSPACE_MAP); | |
6498ece0 | 307 | maps[1] = mnt_get_builtin_optmap(MNT_LINUX_MAP); |
5810d870 KZ |
308 | next = *optstr; |
309 | ||
310 | while (!mnt_optstr_next_option(&next, &name, &namesz, &val, &valsz)) { | |
311 | const struct libmnt_optmap *ent; | |
312 | ||
6498ece0 | 313 | mnt_optmap_get_entry(maps, 2, name, namesz, &ent); |
5810d870 KZ |
314 | if (ent && ent->id && (ent->mask & MNT_NOHLPS)) { |
315 | next = name; | |
316 | rc = mnt_optstr_remove_option_at(optstr, name, | |
317 | val ? val + valsz : name + namesz); | |
318 | if (rc) | |
319 | goto err; | |
320 | } | |
1bb1d80b | 321 | } |
5810d870 KZ |
322 | |
323 | return rc; | |
324 | err: | |
325 | free(*optstr); | |
326 | *optstr = NULL; | |
1bb1d80b KZ |
327 | return rc; |
328 | } | |
329 | ||
1bb1d80b | 330 | /* |
cf94e97f | 331 | * this has to be called before fix_optstr() |
e90e7401 KZ |
332 | * |
333 | * Note that user=<name> maybe be used by some filesystems as filesystem | |
334 | * specific option (e.g. cifs). Yes, developers of such filesystems have | |
335 | * allocated pretty hot place in hell... | |
1bb1d80b | 336 | */ |
68164f6c | 337 | static int evaluate_permissions(struct libmnt_context *cxt) |
1bb1d80b | 338 | { |
766af80b | 339 | unsigned long u_flags = 0; |
1bb1d80b | 340 | |
1b56aae8 KZ |
341 | assert(cxt); |
342 | assert(cxt->fs); | |
343 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); | |
344 | ||
1bb1d80b KZ |
345 | if (!cxt) |
346 | return -EINVAL; | |
347 | if (!cxt->fs) | |
348 | return 0; | |
349 | ||
1b56aae8 KZ |
350 | DBG(CXT, mnt_debug_h(cxt, "mount: evaluating permissions")); |
351 | ||
68164f6c | 352 | mnt_context_get_user_mflags(cxt, &u_flags); |
1bb1d80b KZ |
353 | |
354 | if (!mnt_context_is_restricted(cxt)) { | |
355 | /* | |
356 | * superuser mount | |
357 | */ | |
358 | cxt->user_mountflags &= ~MNT_MS_OWNER; | |
359 | cxt->user_mountflags &= ~MNT_MS_GROUP; | |
1bb1d80b KZ |
360 | } else { |
361 | /* | |
362 | * user mount | |
363 | */ | |
30e43998 KZ |
364 | if (!(cxt->flags & MNT_FL_TAB_APPLIED)) |
365 | { | |
be3df383 | 366 | DBG(CXT, mnt_debug_h(cxt, "perms: fstab not applied, ignore user mount")); |
30e43998 KZ |
367 | return -EPERM; |
368 | } | |
369 | ||
ddfc6f28 | 370 | /* |
e90e7401 KZ |
371 | * MS_OWNERSECURE and MS_SECURE mount options are already |
372 | * applied by mnt_optstr_get_flags() in mnt_context_merge_mflags() | |
373 | * if "user" (but no user=<name> !) options is set. | |
374 | * | |
375 | * Let's ignore all user=<name> (if <name> is set) requests. | |
ddfc6f28 | 376 | */ |
e90e7401 KZ |
377 | if (cxt->user_mountflags & MNT_MS_USER) { |
378 | size_t valsz = 0; | |
1bb1d80b | 379 | |
e90e7401 KZ |
380 | if (!mnt_optstr_get_option(cxt->fs->user_optstr, |
381 | "user", NULL, &valsz) && valsz) { | |
382 | ||
383 | DBG(CXT, mnt_debug_h(cxt, "perms: user=<name> detected, ignore")); | |
384 | cxt->user_mountflags &= ~MNT_MS_USER; | |
385 | } | |
386 | } | |
1bb1d80b KZ |
387 | |
388 | /* | |
389 | * MS_OWNER: Allow owners to mount when fstab contains the | |
390 | * owner option. Note that this should never be used in a high | |
391 | * security environment, but may be useful to give people at | |
392 | * the console the possibility of mounting a floppy. MS_GROUP: | |
393 | * Allow members of device group to mount. (Martin Dickopp) | |
394 | */ | |
395 | if (u_flags & (MNT_MS_OWNER | MNT_MS_GROUP)) { | |
396 | struct stat sb; | |
be3df383 KZ |
397 | struct libmnt_cache *cache = NULL; |
398 | char *xsrc = NULL; | |
399 | const char *srcpath = mnt_fs_get_srcpath(cxt->fs); | |
400 | ||
401 | if (!srcpath) { /* Ah... source is TAG */ | |
402 | cache = mnt_context_get_cache(cxt); | |
403 | xsrc = mnt_resolve_spec( | |
404 | mnt_context_get_source(cxt), | |
405 | cache); | |
406 | srcpath = xsrc; | |
407 | } | |
408 | if (!srcpath) { | |
409 | DBG(CXT, mnt_debug_h(cxt, "perms: src undefined")); | |
410 | return -EPERM; | |
411 | } | |
1bb1d80b KZ |
412 | |
413 | if (strncmp(srcpath, "/dev/", 5) == 0 && | |
414 | stat(srcpath, &sb) == 0 && | |
415 | (((u_flags & MNT_MS_OWNER) && getuid() == sb.st_uid) || | |
416 | ((u_flags & MNT_MS_GROUP) && mnt_in_group(sb.st_gid)))) | |
417 | ||
418 | cxt->user_mountflags |= MNT_MS_USER; | |
be3df383 | 419 | |
0208ae2e | 420 | if (!cache) |
be3df383 | 421 | free(xsrc); |
1bb1d80b KZ |
422 | } |
423 | ||
424 | if (!(cxt->user_mountflags & (MNT_MS_USER | MNT_MS_USERS))) { | |
425 | DBG(CXT, mnt_debug_h(cxt, "permissions evaluation ends with -EPERMS")); | |
426 | return -EPERM; | |
427 | } | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
b70785bc KZ |
433 | /* |
434 | * mnt_context_helper_setopt() backend | |
8c0797e7 | 435 | * |
63de90d4 | 436 | * This function applies mount.type command line option (for example parsed |
8c0797e7 KZ |
437 | * by getopt() or getopt_long()) to @cxt. All unknown options are ignored and |
438 | * then 1 is returned. | |
439 | * | |
440 | * Returns: negative number on error, 1 if @c is unknown option, 0 on success. | |
441 | */ | |
b70785bc | 442 | int mnt_context_mount_setopt(struct libmnt_context *cxt, int c, char *arg) |
8c0797e7 KZ |
443 | { |
444 | int rc = -EINVAL; | |
445 | ||
b70785bc KZ |
446 | assert(cxt); |
447 | assert(cxt->action == MNT_ACT_MOUNT); | |
8c0797e7 KZ |
448 | |
449 | switch(c) { | |
450 | case 'f': | |
451 | rc = mnt_context_enable_fake(cxt, TRUE); | |
452 | break; | |
453 | case 'n': | |
454 | rc = mnt_context_disable_mtab(cxt, TRUE); | |
455 | break; | |
456 | case 'r': | |
457 | rc = mnt_context_append_options(cxt, "ro"); | |
458 | break; | |
459 | case 'v': | |
460 | rc = mnt_context_enable_verbose(cxt, TRUE); | |
461 | break; | |
462 | case 'w': | |
463 | rc = mnt_context_append_options(cxt, "rw"); | |
464 | break; | |
465 | case 'o': | |
466 | if (arg) | |
467 | rc = mnt_context_append_options(cxt, arg); | |
468 | break; | |
469 | case 's': | |
470 | rc = mnt_context_enable_sloppy(cxt, TRUE); | |
471 | break; | |
472 | case 't': | |
473 | if (arg) | |
474 | rc = mnt_context_set_fstype(cxt, arg); | |
475 | break; | |
476 | default: | |
477 | return 1; | |
478 | break; | |
479 | } | |
480 | ||
481 | return rc; | |
482 | } | |
483 | ||
68164f6c | 484 | static int exec_helper(struct libmnt_context *cxt) |
1bb1d80b KZ |
485 | { |
486 | char *o = NULL; | |
487 | int rc; | |
488 | ||
489 | assert(cxt); | |
490 | assert(cxt->fs); | |
491 | assert(cxt->helper); | |
1b56aae8 KZ |
492 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); |
493 | ||
494 | DBG(CXT, mnt_debug_h(cxt, "mount: executing helper %s", cxt->helper)); | |
1bb1d80b KZ |
495 | |
496 | rc = generate_helper_optstr(cxt, &o); | |
497 | if (rc) | |
ea8f06f9 | 498 | return -EINVAL; |
1bb1d80b KZ |
499 | |
500 | DBG_FLUSH; | |
501 | ||
502 | switch (fork()) { | |
503 | case 0: | |
504 | { | |
505 | const char *args[12], *type; | |
506 | int i = 0; | |
507 | ||
508 | if (setgid(getgid()) < 0) | |
509 | exit(EXIT_FAILURE); | |
510 | ||
511 | if (setuid(getuid()) < 0) | |
512 | exit(EXIT_FAILURE); | |
513 | ||
514 | type = mnt_fs_get_fstype(cxt->fs); | |
515 | ||
97e23b5e KZ |
516 | args[i++] = cxt->helper; /* 1 */ |
517 | args[i++] = mnt_fs_get_srcpath(cxt->fs);/* 2 */ | |
1bb1d80b KZ |
518 | args[i++] = mnt_fs_get_target(cxt->fs); /* 3 */ |
519 | ||
9bf96901 KZ |
520 | /* |
521 | * TODO: remove the exception for "nfs", -s is documented | |
522 | * for years should be usable everywhere. | |
523 | */ | |
524 | if (mnt_context_is_sloppy(cxt) && | |
525 | type && startswith(type, "nfs")) | |
1bb1d80b | 526 | args[i++] = "-s"; /* 4 */ |
8c0797e7 | 527 | if (mnt_context_is_fake(cxt)) |
1bb1d80b | 528 | args[i++] = "-f"; /* 5 */ |
8c0797e7 | 529 | if (mnt_context_is_nomtab(cxt)) |
1bb1d80b | 530 | args[i++] = "-n"; /* 6 */ |
8c0797e7 | 531 | if (mnt_context_is_verbose(cxt)) |
1bb1d80b KZ |
532 | args[i++] = "-v"; /* 7 */ |
533 | if (o) { | |
534 | args[i++] = "-o"; /* 8 */ | |
535 | args[i++] = o; /* 9 */ | |
536 | } | |
537 | if (type && !endswith(cxt->helper, type)) { | |
538 | args[i++] = "-t"; /* 10 */ | |
539 | args[i++] = type; /* 11 */ | |
540 | } | |
541 | args[i] = NULL; /* 12 */ | |
542 | #ifdef CONFIG_LIBMOUNT_DEBUG | |
1bb1d80b KZ |
543 | for (i = 0; args[i]; i++) |
544 | DBG(CXT, mnt_debug_h(cxt, "argv[%d] = \"%s\"", | |
545 | i, args[i])); | |
546 | #endif | |
547 | DBG_FLUSH; | |
548 | execv(cxt->helper, (char * const *) args); | |
549 | exit(EXIT_FAILURE); | |
550 | } | |
551 | default: | |
552 | { | |
553 | int st; | |
554 | wait(&st); | |
555 | cxt->helper_status = WIFEXITED(st) ? WEXITSTATUS(st) : -1; | |
556 | ||
557 | DBG(CXT, mnt_debug_h(cxt, "%s executed [status=%d]", | |
558 | cxt->helper, cxt->helper_status)); | |
97e23b5e | 559 | cxt->helper_exec_status = rc = 0; |
1bb1d80b KZ |
560 | break; |
561 | } | |
562 | ||
563 | case -1: | |
97e23b5e | 564 | cxt->helper_exec_status = rc = -errno; |
1bb1d80b KZ |
565 | DBG(CXT, mnt_debug_h(cxt, "fork() failed")); |
566 | break; | |
567 | } | |
568 | ||
31821efc | 569 | free(o); |
1bb1d80b KZ |
570 | return rc; |
571 | } | |
572 | ||
6498ece0 KZ |
573 | static int do_mount_additional(struct libmnt_context *cxt, |
574 | const char *target, | |
575 | unsigned long flags, | |
576 | int *syserr) | |
577 | { | |
578 | struct list_head *p; | |
579 | ||
580 | assert(cxt); | |
581 | assert(target); | |
582 | ||
583 | if (syserr) | |
584 | *syserr = 0; | |
585 | ||
586 | list_for_each(p, &cxt->addmounts) { | |
587 | int rc; | |
588 | struct libmnt_addmount *ad = | |
589 | list_entry(p, struct libmnt_addmount, mounts); | |
590 | ||
591 | DBG(CXT, mnt_debug_h(cxt, "mount(2) changing flag: 0x%08lx %s", | |
592 | ad->mountflags, | |
593 | ad->mountflags & MS_REC ? " (recursive)" : "")); | |
594 | ||
595 | rc = mount("none", target, NULL, | |
596 | ad->mountflags | (flags & MS_SILENT), NULL); | |
597 | if (rc) { | |
598 | if (syserr) | |
599 | *syserr = -errno; | |
600 | DBG(CXT, mnt_debug_h(cxt, | |
601 | "mount(2) failed [errno=%d %m]", | |
602 | errno)); | |
603 | return rc; | |
604 | } | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
1bb1d80b KZ |
610 | /* |
611 | * The default is to use fstype from cxt->fs, this could be overwritten by | |
612 | * @try_type argument. | |
9f7472b0 KZ |
613 | * |
614 | * Returns: 0 on success, | |
615 | * >0 in case of mount(2) error (returns syscall errno), | |
616 | * <0 in case of other errors. | |
1bb1d80b | 617 | */ |
68164f6c | 618 | static int do_mount(struct libmnt_context *cxt, const char *try_type) |
1bb1d80b | 619 | { |
97e23b5e | 620 | int rc = 0; |
1bb1d80b KZ |
621 | const char *src, *target, *type; |
622 | unsigned long flags; | |
623 | ||
624 | assert(cxt); | |
625 | assert(cxt->fs); | |
1b56aae8 | 626 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); |
1bb1d80b KZ |
627 | |
628 | if (try_type && !cxt->helper) { | |
629 | rc = mnt_context_prepare_helper(cxt, "mount", try_type); | |
ae5afe07 | 630 | if (rc) |
1bb1d80b KZ |
631 | return rc; |
632 | } | |
1bb1d80b | 633 | |
1bb1d80b KZ |
634 | flags = cxt->mountflags; |
635 | src = mnt_fs_get_srcpath(cxt->fs); | |
636 | target = mnt_fs_get_target(cxt->fs); | |
637 | ||
6498ece0 KZ |
638 | if (cxt->helper) { |
639 | rc = exec_helper(cxt); | |
640 | ||
641 | if (mnt_context_helper_executed(cxt) | |
642 | && mnt_context_get_helper_status(cxt) == 0 | |
643 | && !list_empty(&cxt->addmounts) | |
644 | && do_mount_additional(cxt, target, flags, NULL)) | |
645 | ||
646 | return -MNT_ERR_APPLYFLAGS; | |
647 | return rc; | |
648 | } | |
649 | ||
772cce37 | 650 | if (!target) |
1bb1d80b | 651 | return -EINVAL; |
41d6af28 KZ |
652 | if (!src) { |
653 | /* unnecessary, should be already resolved in | |
654 | * mnt_context_prepare_srcpath(), but for sure... */ | |
655 | DBG(CXT, mnt_debug_h(cxt, "WARNING: source is NULL -- using \"none\"!")); | |
772cce37 | 656 | src = "none"; |
41d6af28 | 657 | } |
97e23b5e KZ |
658 | type = try_type ? : mnt_fs_get_fstype(cxt->fs); |
659 | ||
1bb1d80b KZ |
660 | if (!(flags & MS_MGC_MSK)) |
661 | flags |= MS_MGC_VAL; | |
662 | ||
ea8f06f9 | 663 | DBG(CXT, mnt_debug_h(cxt, "%smount(2) " |
1bb1d80b | 664 | "[source=%s, target=%s, type=%s, " |
66bb8267 | 665 | " mountflags=0x%08lx, mountdata=%s]", |
379e8439 | 666 | mnt_context_is_fake(cxt) ? "(FAKE) " : "", |
1bb1d80b KZ |
667 | src, target, type, |
668 | flags, cxt->mountdata ? "yes" : "<none>")); | |
669 | ||
6498ece0 KZ |
670 | if (mnt_context_is_fake(cxt)) { |
671 | /* | |
672 | * fake | |
673 | */ | |
dbde1923 | 674 | cxt->syscall_status = 0; |
6498ece0 KZ |
675 | |
676 | } else if (mnt_context_propagation_only(cxt)) { | |
677 | /* | |
678 | * propagation flags *only* | |
679 | */ | |
680 | if (do_mount_additional(cxt, target, flags, &cxt->syscall_status)) | |
681 | return -MNT_ERR_APPLYFLAGS; | |
682 | } else { | |
683 | /* | |
684 | * regular mount | |
685 | */ | |
ea8f06f9 | 686 | if (mount(src, target, type, flags, cxt->mountdata)) { |
97e23b5e | 687 | cxt->syscall_status = -errno; |
dd369652 | 688 | DBG(CXT, mnt_debug_h(cxt, "mount(2) failed [errno=%d %m]", |
97e23b5e | 689 | -cxt->syscall_status)); |
5982583a | 690 | return -cxt->syscall_status; |
ea8f06f9 KZ |
691 | } |
692 | DBG(CXT, mnt_debug_h(cxt, "mount(2) success")); | |
97e23b5e | 693 | cxt->syscall_status = 0; |
6498ece0 KZ |
694 | |
695 | /* | |
696 | * additional mounts for extra propagation flags | |
697 | */ | |
698 | if (!list_empty(&cxt->addmounts) | |
699 | && do_mount_additional(cxt, target, flags, NULL)) { | |
700 | ||
701 | /* TODO: call umount? */ | |
702 | return -MNT_ERR_APPLYFLAGS; | |
703 | } | |
1bb1d80b | 704 | } |
97e23b5e KZ |
705 | |
706 | if (try_type && cxt->update) { | |
68164f6c | 707 | struct libmnt_fs *fs = mnt_update_get_fs(cxt->update); |
97e23b5e KZ |
708 | if (fs) |
709 | rc = mnt_fs_set_fstype(fs, try_type); | |
710 | } | |
36bda5cb | 711 | |
97e23b5e KZ |
712 | return rc; |
713 | } | |
714 | ||
68164f6c | 715 | static int do_mount_by_pattern(struct libmnt_context *cxt, const char *pattern) |
97e23b5e KZ |
716 | { |
717 | int neg = pattern && strncmp(pattern, "no", 2) == 0; | |
718 | int rc = -EINVAL; | |
719 | char **filesystems, **fp; | |
720 | ||
721 | assert(cxt); | |
46cfd4a2 | 722 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); |
97e23b5e KZ |
723 | |
724 | if (!neg && pattern) { | |
725 | /* | |
726 | * try all types from the list | |
727 | */ | |
728 | char *p, *p0; | |
729 | ||
26e42d81 | 730 | DBG(CXT, mnt_debug_h(cxt, "trying to mount by FS pattern list")); |
b0bb8fb6 | 731 | |
97e23b5e KZ |
732 | p0 = p = strdup(pattern); |
733 | if (!p) | |
734 | return -ENOMEM; | |
735 | do { | |
736 | char *end = strchr(p, ','); | |
737 | if (end) | |
738 | *end = '\0'; | |
739 | rc = do_mount(cxt, p); | |
740 | p = end ? end + 1 : NULL; | |
ae5afe07 | 741 | |
97e23b5e KZ |
742 | } while (!mnt_context_get_status(cxt) && p); |
743 | ||
744 | free(p0); | |
745 | ||
746 | if (mnt_context_get_status(cxt)) | |
747 | return rc; | |
748 | } | |
749 | ||
750 | /* | |
751 | * try /etc/filesystems and /proc/filesystems | |
752 | */ | |
26e42d81 | 753 | DBG(CXT, mnt_debug_h(cxt, "trying to mount by filesystems lists")); |
b0bb8fb6 | 754 | |
97e23b5e KZ |
755 | rc = mnt_get_filesystems(&filesystems, neg ? pattern : NULL); |
756 | if (rc) | |
757 | return rc; | |
758 | ||
3de77c21 KZ |
759 | if (filesystems == NULL) |
760 | return -MNT_ERR_NOFSTYPE; | |
761 | ||
97e23b5e KZ |
762 | for (fp = filesystems; *fp; fp++) { |
763 | rc = do_mount(cxt, *fp); | |
764 | if (mnt_context_get_status(cxt)) | |
765 | break; | |
ec8121b1 KZ |
766 | if (mnt_context_get_syscall_errno(cxt) != EINVAL && |
767 | mnt_context_get_syscall_errno(cxt) != ENODEV) | |
ae5afe07 | 768 | break; |
97e23b5e KZ |
769 | } |
770 | mnt_free_filesystems(filesystems); | |
771 | return rc; | |
1bb1d80b KZ |
772 | } |
773 | ||
774 | /** | |
dbde1923 KZ |
775 | * mnt_context_prepare_mount: |
776 | * @cxt: context | |
1bb1d80b | 777 | * |
dbde1923 | 778 | * Prepare context for mounting, unnecessary for mnt_context_mount(). |
1bb1d80b | 779 | * |
dbde1923 | 780 | * Returns: negative number on error, zero on success |
1bb1d80b | 781 | */ |
68164f6c | 782 | int mnt_context_prepare_mount(struct libmnt_context *cxt) |
1bb1d80b | 783 | { |
dbde1923 | 784 | int rc = -EINVAL; |
1bb1d80b | 785 | |
1d0cd73f KZ |
786 | assert(cxt); |
787 | assert(cxt->fs); | |
97e23b5e KZ |
788 | assert(cxt->helper_exec_status == 1); |
789 | assert(cxt->syscall_status == 1); | |
1bb1d80b | 790 | |
c70d9d76 | 791 | if (!cxt || !cxt->fs || mnt_fs_is_swaparea(cxt->fs)) |
1bb1d80b | 792 | return -EINVAL; |
1d0cd73f KZ |
793 | if (!mnt_fs_get_source(cxt->fs) && !mnt_fs_get_target(cxt->fs)) |
794 | return -EINVAL; | |
dbde1923 KZ |
795 | if (cxt->flags & MNT_FL_PREPARED) |
796 | return 0; | |
797 | ||
1d0cd73f | 798 | cxt->action = MNT_ACT_MOUNT; |
1bb1d80b | 799 | |
1b56aae8 KZ |
800 | DBG(CXT, mnt_debug_h(cxt, "mount: preparing")); |
801 | ||
f63173b2 | 802 | rc = mnt_context_apply_fstab(cxt); |
1bb1d80b | 803 | if (!rc) |
68164f6c | 804 | rc = mnt_context_merge_mflags(cxt); |
1bb1d80b KZ |
805 | if (!rc) |
806 | rc = evaluate_permissions(cxt); | |
807 | if (!rc) | |
808 | rc = fix_optstr(cxt); | |
809 | if (!rc) | |
810 | rc = mnt_context_prepare_srcpath(cxt); | |
c59cf20c | 811 | if (!rc) |
f5017242 | 812 | rc = mnt_context_prepare_target(cxt); |
1bb1d80b KZ |
813 | if (!rc) |
814 | rc = mnt_context_guess_fstype(cxt); | |
815 | if (!rc) | |
816 | rc = mnt_context_prepare_helper(cxt, "mount", NULL); | |
1d0cd73f KZ |
817 | if (rc) { |
818 | DBG(CXT, mnt_debug_h(cxt, "mount: preparing failed")); | |
819 | return rc; | |
1bb1d80b | 820 | } |
dbde1923 KZ |
821 | cxt->flags |= MNT_FL_PREPARED; |
822 | return rc; | |
823 | } | |
824 | ||
825 | /** | |
826 | * mnt_context_do_mount | |
827 | * @cxt: context | |
828 | * | |
63de90d4 | 829 | * Call mount(2) or mount.type helper. Unnecessary for mnt_context_mount(). |
dbde1923 | 830 | * |
8ab6accf KZ |
831 | * Note that this function could be called only once. If you want to mount |
832 | * another source or target than you have to call mnt_reset_context(). | |
833 | * | |
871ffd09 | 834 | * If you want to call mount(2) for the same source and target with a different |
379e8439 | 835 | * mount flags or fstype then call mnt_context_reset_status() and then try |
8ab6accf KZ |
836 | * again mnt_context_do_mount(). |
837 | * | |
5982583a | 838 | * WARNING: non-zero return code does not mean that mount(2) syscall or |
455fe9a0 | 839 | * mount.type helper wasn't successfully called. |
5982583a KZ |
840 | * |
841 | * Check mnt_context_get_status() after error! | |
842 | * | |
843 | * Returns: 0 on success; | |
844 | * >0 in case of mount(2) error (returns syscall errno), | |
845 | * <0 in case of other errors. | |
dbde1923 | 846 | */ |
68164f6c | 847 | int mnt_context_do_mount(struct libmnt_context *cxt) |
dbde1923 KZ |
848 | { |
849 | const char *type; | |
f9906424 | 850 | int res; |
dbde1923 KZ |
851 | |
852 | assert(cxt); | |
853 | assert(cxt->fs); | |
854 | assert(cxt->helper_exec_status == 1); | |
855 | assert(cxt->syscall_status == 1); | |
856 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); | |
857 | assert((cxt->flags & MNT_FL_PREPARED)); | |
cfb9db30 | 858 | assert((cxt->action == MNT_ACT_MOUNT)); |
1bb1d80b | 859 | |
1b56aae8 KZ |
860 | DBG(CXT, mnt_debug_h(cxt, "mount: do mount")); |
861 | ||
1bb1d80b | 862 | if (!(cxt->flags & MNT_FL_MOUNTDATA)) |
76a06ca4 | 863 | cxt->mountdata = (char *) mnt_fs_get_fs_options(cxt->fs); |
1bb1d80b KZ |
864 | |
865 | type = mnt_fs_get_fstype(cxt->fs); | |
bbf9ce79 GFM |
866 | if (type) { |
867 | if (strchr(type, ',')) | |
58c41e15 | 868 | /* this only happens if fstab contains list of filesystems */ |
bbf9ce79 GFM |
869 | res = do_mount_by_pattern(cxt, type); |
870 | else | |
871 | res = do_mount(cxt, NULL); | |
872 | } else | |
f9906424 KZ |
873 | res = do_mount_by_pattern(cxt, cxt->fstype_pattern); |
874 | ||
875 | if (mnt_context_get_status(cxt) | |
379e8439 | 876 | && !mnt_context_is_fake(cxt) |
f9906424 KZ |
877 | && !cxt->helper) { |
878 | /* | |
879 | * Mounted by mount(2), do some post-mount checks | |
880 | * | |
881 | * Kernel allows to use MS_RDONLY for bind mounts, but the | |
882 | * read-only request could be silently ignored. Check it to | |
883 | * avoid 'ro' in mtab and 'rw' in /proc/mounts. | |
884 | */ | |
885 | if ((cxt->mountflags & MS_BIND) | |
886 | && (cxt->mountflags & MS_RDONLY) | |
887 | && !mnt_is_readonly(mnt_context_get_target(cxt))) | |
888 | ||
889 | mnt_context_set_mflags(cxt, | |
890 | cxt->mountflags & ~MS_RDONLY); | |
891 | ||
892 | ||
893 | /* Kernel can silently add MS_RDONLY flag when mounting file | |
894 | * system that does not have write support. Check this to avoid | |
895 | * 'ro' in /proc/mounts and 'rw' in mtab. | |
896 | */ | |
6498ece0 KZ |
897 | if (!(cxt->mountflags & (MS_RDONLY | MS_MOVE)) |
898 | && !mnt_context_propagation_only(cxt) | |
f9906424 KZ |
899 | && mnt_is_readonly(mnt_context_get_target(cxt))) |
900 | ||
901 | mnt_context_set_mflags(cxt, | |
902 | cxt->mountflags | MS_RDONLY); | |
903 | } | |
dbde1923 | 904 | |
f9906424 | 905 | return res; |
dbde1923 KZ |
906 | } |
907 | ||
908 | /** | |
cfb9db30 KZ |
909 | * mnt_context_finalize_mount: |
910 | * @cxt: context | |
911 | * | |
912 | * Mtab update, etc. Unnecessary for mnt_context_mount(), but should be called | |
913 | * after mnt_context_do_mount(). See also mnt_context_set_syscall_status(). | |
914 | * | |
915 | * Returns: negative number on error, 0 on success. | |
916 | */ | |
917 | int mnt_context_finalize_mount(struct libmnt_context *cxt) | |
918 | { | |
919 | int rc; | |
920 | ||
921 | assert(cxt); | |
922 | assert(cxt->fs); | |
923 | assert((cxt->flags & MNT_FL_MOUNTFLAGS_MERGED)); | |
924 | assert((cxt->flags & MNT_FL_PREPARED)); | |
925 | ||
926 | rc = mnt_context_prepare_update(cxt); | |
927 | if (!rc) | |
928 | rc = mnt_context_update_tabs(cxt);; | |
929 | return rc; | |
930 | } | |
931 | ||
932 | /** | |
933 | * mnt_context_mount: | |
dbde1923 KZ |
934 | * @cxt: mount context |
935 | * | |
cfb9db30 | 936 | * High-level, mounts filesystem by mount(2) or fork()+exec(/sbin/mount.type). |
dbde1923 | 937 | * |
cfb9db30 | 938 | * This is similar to: |
dbde1923 KZ |
939 | * |
940 | * mnt_context_prepare_mount(cxt); | |
941 | * mnt_context_do_mount(cxt); | |
942 | * mnt_context_finalize_mount(cxt); | |
943 | * | |
944 | * See also mnt_context_disable_helpers(). | |
945 | * | |
8ab6accf KZ |
946 | * Note that this function could be called only once. If you want to mount with |
947 | * different setting than you have to call mnt_reset_context(). It's NOT enough | |
ee314075 | 948 | * to call mnt_context_reset_status() if you want call this function more than |
8ab6accf KZ |
949 | * once, whole context has to be reseted. |
950 | * | |
5982583a | 951 | * WARNING: non-zero return code does not mean that mount(2) syscall or |
455fe9a0 | 952 | * mount.type helper wasn't successfully called. |
5982583a KZ |
953 | * |
954 | * Check mnt_context_get_status() after error! | |
9f7472b0 | 955 | * |
5982583a KZ |
956 | * Returns: 0 on success; |
957 | * >0 in case of mount(2) error (returns syscall errno), | |
958 | * <0 in case of other errors. | |
dbde1923 | 959 | */ |
cfb9db30 | 960 | int mnt_context_mount(struct libmnt_context *cxt) |
dbde1923 KZ |
961 | { |
962 | int rc; | |
963 | ||
964 | assert(cxt); | |
965 | assert(cxt->fs); | |
966 | assert(cxt->helper_exec_status == 1); | |
967 | assert(cxt->syscall_status == 1); | |
968 | ||
969 | rc = mnt_context_prepare_mount(cxt); | |
970 | if (!rc) | |
971 | rc = mnt_context_prepare_update(cxt); | |
972 | if (!rc) | |
973 | rc = mnt_context_do_mount(cxt); | |
1bb1d80b | 974 | |
1d0cd73f KZ |
975 | /* TODO: if mtab update is expected then check if the |
976 | * target is really mounted read-write to avoid 'ro' in | |
977 | * mtab and 'rw' in /proc/mounts. | |
1bb1d80b | 978 | */ |
dbde1923 KZ |
979 | if (!rc) |
980 | rc = mnt_context_update_tabs(cxt); | |
981 | return rc; | |
982 | } | |
983 | ||
9f7472b0 KZ |
984 | /** |
985 | * mnt_context_next_mount: | |
986 | * @cxt: context | |
987 | * @itr: iterator | |
988 | * @fs: returns the current filesystem | |
e6ecd606 | 989 | * @mntrc: returns the return code from mnt_context_mount() |
9f7472b0 KZ |
990 | * @ignored: returns 1 for not matching and 2 for already mounted filesystems |
991 | * | |
992 | * This function tries to mount the next filesystem from fstab (as returned by | |
993 | * mnt_context_get_fstab()). See also mnt_context_set_fstab(). | |
994 | * | |
995 | * You can filter out filesystems by: | |
63de90d4 KZ |
996 | * mnt_context_set_options_pattern() to simulate mount -a -O pattern |
997 | * mnt_context_set_fstype_pattern() to simulate mount -a -t pattern | |
9f7472b0 KZ |
998 | * |
999 | * If the filesystem is already mounted or does not match defined criteria, | |
1000 | * then the mnt_context_next_mount() function returns zero, but the @ignored is | |
1001 | * non-zero. Note that the root filesystem and filesystems with "noauto" option | |
1002 | * are always ignored. | |
1003 | * | |
63de90d4 | 1004 | * If mount(2) syscall or mount.type helper failed, then the |
9f7472b0 KZ |
1005 | * mnt_context_next_mount() function returns zero, but the @mntrc is non-zero. |
1006 | * Use also mnt_context_get_status() to check if the filesystem was | |
1007 | * successfully mounted. | |
1008 | * | |
1009 | * Returns: 0 on success, | |
1010 | * <0 in case of error (!= mount(2) errors) | |
1011 | * 1 at the end of the list. | |
1012 | */ | |
1013 | int mnt_context_next_mount(struct libmnt_context *cxt, | |
1014 | struct libmnt_iter *itr, | |
1015 | struct libmnt_fs **fs, | |
1016 | int *mntrc, | |
1017 | int *ignored) | |
1018 | { | |
1019 | struct libmnt_table *fstab, *mtab; | |
1020 | const char *o, *tgt; | |
1021 | int rc, mounted = 0; | |
1022 | ||
1023 | if (ignored) | |
1024 | *ignored = 0; | |
1025 | if (mntrc) | |
1026 | *mntrc = 0; | |
1027 | ||
1028 | if (!cxt || !fs || !itr) | |
1029 | return -EINVAL; | |
1030 | ||
1031 | mtab = cxt->mtab; | |
1032 | cxt->mtab = NULL; /* do not reset mtab */ | |
1033 | mnt_reset_context(cxt); | |
1034 | cxt->mtab = mtab; | |
1035 | ||
1036 | rc = mnt_context_get_fstab(cxt, &fstab); | |
1037 | if (rc) | |
1038 | return rc; | |
1039 | ||
1040 | rc = mnt_table_next_fs(fstab, itr, fs); | |
1041 | if (rc != 0) | |
1042 | return rc; /* more filesystems (or error) */ | |
1043 | ||
1044 | o = mnt_fs_get_user_options(*fs); | |
1045 | tgt = mnt_fs_get_target(*fs); | |
1046 | ||
1047 | DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt)); | |
1048 | ||
1049 | /* ignore swap */ | |
c70d9d76 | 1050 | if (mnt_fs_is_swaparea(*fs) || |
9f7472b0 KZ |
1051 | |
1052 | /* ignore root filesystem */ | |
c70d9d76 | 1053 | (tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) || |
9f7472b0 KZ |
1054 | |
1055 | /* ignore noauto filesystems */ | |
1056 | (o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) || | |
1057 | ||
1058 | /* ignore filesystems not match with options patterns */ | |
1059 | (cxt->fstype_pattern && !mnt_fs_match_fstype(*fs, | |
1060 | cxt->fstype_pattern)) || | |
1061 | ||
1062 | /* ignore filesystems not match with type patterns */ | |
1063 | (cxt->optstr_pattern && !mnt_fs_match_options(*fs, | |
1064 | cxt->optstr_pattern))) { | |
1065 | if (ignored) | |
1066 | *ignored = 1; | |
1067 | DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match " | |
1068 | "[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]", | |
1069 | mnt_fs_get_fstype(*fs), | |
1070 | cxt->fstype_pattern, | |
1071 | mnt_fs_get_options(*fs), | |
1072 | cxt->optstr_pattern)); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /* ignore already mounted filesystems */ | |
1077 | rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted); | |
1078 | if (rc) | |
1079 | return rc; | |
1080 | if (mounted) { | |
1081 | if (ignored) | |
1082 | *ignored = 2; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
d2c97887 KZ |
1086 | if (mnt_context_is_fork(cxt)) { |
1087 | rc = mnt_fork_context(cxt); | |
1088 | if (rc) | |
1089 | return rc; /* fork error */ | |
1090 | ||
1091 | if (mnt_context_is_parent(cxt)) { | |
1092 | return 0; /* parent */ | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | /* child or non-forked */ | |
1097 | ||
9f7472b0 | 1098 | rc = mnt_context_set_fs(cxt, *fs); |
d2c97887 KZ |
1099 | if (!rc) { |
1100 | rc = mnt_context_mount(cxt); | |
1101 | if (mntrc) | |
1102 | *mntrc = rc; | |
1103 | } | |
1104 | ||
1105 | if (mnt_context_is_child(cxt)) { | |
1106 | DBG(CXT, mnt_debug_h(cxt, "next-mount: child exit [rc=%d]", rc)); | |
1107 | DBG_FLUSH; | |
1108 | exit(rc); | |
1109 | } | |
9f7472b0 KZ |
1110 | return 0; |
1111 | } | |
1112 |