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d53368f6 BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. | |
24 | * Copyright (c) 2011 Lawrence Livermore National Security, LLC. | |
25 | */ | |
26 | ||
27 | #include <libintl.h> | |
28 | #include <unistd.h> | |
29 | #include <sys/file.h> | |
30 | #include <sys/mount.h> | |
31 | #include <sys/stat.h> | |
32 | #include <libzfs.h> | |
33 | #ifdef HAVE_LIBSELINUX | |
34 | #include <selinux/selinux.h> | |
35 | #endif /* HAVE_LIBSELINUX */ | |
36 | ||
37 | libzfs_handle_t *g_zfs; | |
38 | ||
39 | typedef struct option_map { | |
40 | const char *name; | |
41 | unsigned long mntmask; | |
42 | unsigned long zfsmask; | |
43 | } option_map_t; | |
44 | ||
45 | static const option_map_t option_map[] = { | |
46 | /* Canonicalized filesystem independent options from mount(8) */ | |
47 | { MNTOPT_NOAUTO, MS_COMMENT, ZS_COMMENT }, | |
48 | { MNTOPT_DEFAULTS, MS_COMMENT, ZS_COMMENT }, | |
49 | { MNTOPT_NODEVICES, MS_NODEV, ZS_COMMENT }, | |
50 | { MNTOPT_DIRSYNC, MS_DIRSYNC, ZS_COMMENT }, | |
51 | { MNTOPT_NOEXEC, MS_NOEXEC, ZS_COMMENT }, | |
52 | { MNTOPT_GROUP, MS_GROUP, ZS_COMMENT }, | |
53 | { MNTOPT_NETDEV, MS_COMMENT, ZS_COMMENT }, | |
54 | { MNTOPT_NOFAIL, MS_COMMENT, ZS_COMMENT }, | |
55 | { MNTOPT_NOSUID, MS_NOSUID, ZS_COMMENT }, | |
56 | { MNTOPT_OWNER, MS_OWNER, ZS_COMMENT }, | |
57 | { MNTOPT_REMOUNT, MS_REMOUNT, ZS_COMMENT }, | |
58 | { MNTOPT_RO, MS_RDONLY, ZS_COMMENT }, | |
59 | { MNTOPT_RW, MS_COMMENT, ZS_COMMENT }, | |
60 | { MNTOPT_SYNC, MS_SYNCHRONOUS, ZS_COMMENT }, | |
61 | { MNTOPT_USER, MS_USERS, ZS_COMMENT }, | |
62 | { MNTOPT_USERS, MS_USERS, ZS_COMMENT }, | |
63 | #ifdef MS_NOATIME | |
64 | { MNTOPT_NOATIME, MS_NOATIME, ZS_COMMENT }, | |
65 | #endif | |
66 | #ifdef MS_NODIRATIME | |
67 | { MNTOPT_NODIRATIME, MS_NODIRATIME, ZS_COMMENT }, | |
68 | #endif | |
69 | #ifdef MS_RELATIME | |
70 | { MNTOPT_RELATIME, MS_RELATIME, ZS_COMMENT }, | |
71 | #endif | |
72 | #ifdef MS_STRICTATIME | |
73 | { MNTOPT_DFRATIME, MS_STRICTATIME, ZS_COMMENT }, | |
74 | #endif | |
d53368f6 BB |
75 | { MNTOPT_CONTEXT, MS_COMMENT, ZS_NOCONTEXT }, |
76 | { MNTOPT_NOCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, | |
77 | { MNTOPT_FSCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, | |
78 | { MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, | |
79 | { MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, | |
d53368f6 BB |
80 | #ifdef MS_I_VERSION |
81 | { MNTOPT_IVERSION, MS_I_VERSION, ZS_COMMENT }, | |
82 | #endif | |
83 | #ifdef MS_MANDLOCK | |
84 | { MNTOPT_NBMAND, MS_MANDLOCK, ZS_COMMENT }, | |
85 | #endif | |
86 | /* Valid options not found in mount(8) */ | |
87 | { MNTOPT_BIND, MS_BIND, ZS_COMMENT }, | |
88 | #ifdef MS_REC | |
89 | { MNTOPT_RBIND, MS_BIND|MS_REC, ZS_COMMENT }, | |
90 | #endif | |
91 | { MNTOPT_COMMENT, MS_COMMENT, ZS_COMMENT }, | |
92 | #ifdef MS_NOSUB | |
93 | { MNTOPT_NOSUB, MS_NOSUB, ZS_COMMENT }, | |
94 | #endif | |
95 | #ifdef MS_SILENT | |
96 | { MNTOPT_QUIET, MS_SILENT, ZS_COMMENT }, | |
97 | #endif | |
98 | /* Custom zfs options */ | |
2cf7f52b | 99 | { MNTOPT_XATTR, MS_COMMENT, ZS_COMMENT }, |
d53368f6 BB |
100 | { MNTOPT_NOXATTR, MS_COMMENT, ZS_COMMENT }, |
101 | { MNTOPT_ZFSUTIL, MS_COMMENT, ZS_ZFSUTIL }, | |
102 | { NULL, 0, 0 } }; | |
103 | ||
104 | /* | |
105 | * Break the mount option in to a name/value pair. The name is | |
106 | * validated against the option map and mount flags set accordingly. | |
107 | */ | |
108 | static int | |
109 | parse_option(char *mntopt, unsigned long *mntflags, | |
110 | unsigned long *zfsflags, int sloppy) | |
111 | { | |
112 | const option_map_t *opt; | |
113 | char *ptr, *name, *value = NULL; | |
114 | int error = 0; | |
115 | ||
116 | name = strdup(mntopt); | |
117 | if (name == NULL) | |
118 | return (ENOMEM); | |
119 | ||
120 | for (ptr = name; ptr && *ptr; ptr++) { | |
121 | if (*ptr == '=') { | |
122 | *ptr = '\0'; | |
123 | value = ptr+1; | |
03514b01 | 124 | VERIFY3P(value, !=, NULL); |
d53368f6 BB |
125 | break; |
126 | } | |
127 | } | |
128 | ||
129 | for (opt = option_map; opt->name != NULL; opt++) { | |
130 | if (strncmp(name, opt->name, strlen(name)) == 0) { | |
131 | *mntflags |= opt->mntmask; | |
132 | *zfsflags |= opt->zfsmask; | |
133 | ||
134 | /* MS_USERS implies default user options */ | |
135 | if (opt->mntmask & (MS_USERS)) | |
136 | *mntflags |= (MS_NOEXEC|MS_NOSUID|MS_NODEV); | |
137 | ||
138 | /* MS_OWNER|MS_GROUP imply default owner options */ | |
139 | if (opt->mntmask & (MS_OWNER | MS_GROUP)) | |
140 | *mntflags |= (MS_NOSUID|MS_NODEV); | |
141 | ||
142 | error = 0; | |
143 | goto out; | |
144 | } | |
145 | } | |
146 | ||
147 | if (!sloppy) | |
148 | error = ENOENT; | |
149 | out: | |
150 | /* If required further process on the value may be done here */ | |
151 | free(name); | |
152 | return (error); | |
153 | } | |
154 | ||
155 | /* | |
156 | * Translate the mount option string in to MS_* mount flags for the | |
157 | * kernel vfs. When sloppy is non-zero unknown options will be ignored | |
158 | * otherwise they are considered fatal are copied in to badopt. | |
159 | */ | |
160 | static int | |
3aff7755 BB |
161 | parse_options(char *mntopts, unsigned long *mntflags, unsigned long *zfsflags, |
162 | int sloppy, char *badopt, char *mtabopt) | |
d53368f6 | 163 | { |
3aff7755 | 164 | int error = 0, quote = 0, flag = 0, count = 0; |
d53368f6 BB |
165 | char *ptr, *opt, *opts; |
166 | ||
167 | opts = strdup(mntopts); | |
168 | if (opts == NULL) | |
169 | return (ENOMEM); | |
170 | ||
171 | *mntflags = 0; | |
172 | opt = NULL; | |
173 | ||
174 | /* | |
175 | * Scan through all mount options which must be comma delimited. | |
176 | * We must be careful to notice regions which are double quoted | |
177 | * and skip commas in these regions. Each option is then checked | |
178 | * to determine if it is a known option. | |
179 | */ | |
180 | for (ptr = opts; ptr && !flag; ptr++) { | |
181 | if (opt == NULL) | |
182 | opt = ptr; | |
183 | ||
184 | if (*ptr == '"') | |
185 | quote = !quote; | |
186 | ||
187 | if (quote) | |
188 | continue; | |
189 | ||
190 | if (*ptr == '\0') | |
191 | flag = 1; | |
192 | ||
193 | if ((*ptr == ',') || (*ptr == '\0')) { | |
194 | *ptr = '\0'; | |
195 | ||
196 | error = parse_option(opt, mntflags, zfsflags, sloppy); | |
197 | if (error) { | |
198 | strcpy(badopt, opt); | |
199 | goto out; | |
3aff7755 BB |
200 | |
201 | } | |
202 | ||
203 | if (!(*mntflags & MS_REMOUNT) && | |
204 | !(*zfsflags & ZS_ZFSUTIL)) { | |
205 | if (count > 0) | |
206 | strlcat(mtabopt, ",", MNT_LINE_MAX); | |
207 | ||
208 | strlcat(mtabopt, opt, MNT_LINE_MAX); | |
209 | count++; | |
d53368f6 BB |
210 | } |
211 | ||
212 | opt = NULL; | |
213 | } | |
214 | } | |
215 | ||
216 | out: | |
217 | free(opts); | |
218 | return (error); | |
219 | } | |
220 | ||
221 | /* | |
222 | * If a file or directory in your current working directory is named | |
223 | * 'dataset' then mount(8) will prepend your current working directory | |
224 | * to dataset. The is no way to prevent this behavior so we simply | |
225 | * check for it and strip the prepended patch when it is added. | |
226 | */ | |
227 | static char * | |
228 | parse_dataset(char *dataset) | |
229 | { | |
230 | char cwd[PATH_MAX]; | |
a6cba65c | 231 | int len; |
d53368f6 | 232 | |
ec49a5f0 BB |
233 | if (getcwd(cwd, PATH_MAX) == NULL) |
234 | return (dataset); | |
235 | ||
a6cba65c BB |
236 | len = strlen(cwd); |
237 | ||
238 | /* Do not add one when cwd already ends in a trailing '/' */ | |
239 | if (!strncmp(cwd, dataset, len)) | |
240 | return (dataset + len + (cwd[len-1] != '/')); | |
d53368f6 BB |
241 | |
242 | return (dataset); | |
243 | } | |
244 | ||
245 | /* | |
246 | * Update the mtab_* code to use the libmount library when it is commonly | |
247 | * available otherwise fallback to legacy mode. The mount(8) utility will | |
248 | * manage the lock file for us to prevent racing updates to /etc/mtab. | |
249 | */ | |
250 | static int | |
251 | mtab_is_writeable(void) | |
252 | { | |
253 | struct stat st; | |
254 | int error, fd; | |
255 | ||
e130330a | 256 | error = lstat(MNTTAB, &st); |
d53368f6 BB |
257 | if (error || S_ISLNK(st.st_mode)) |
258 | return (0); | |
259 | ||
260 | fd = open(MNTTAB, O_RDWR | O_CREAT, 0644); | |
261 | if (fd < 0) | |
262 | return (0); | |
263 | ||
264 | close(fd); | |
265 | return (1); | |
266 | } | |
267 | ||
268 | static int | |
269 | mtab_update(char *dataset, char *mntpoint, char *type, char *mntopts) | |
270 | { | |
271 | struct mntent mnt; | |
272 | FILE *fp; | |
273 | int error; | |
274 | ||
275 | mnt.mnt_fsname = dataset; | |
276 | mnt.mnt_dir = mntpoint; | |
277 | mnt.mnt_type = type; | |
278 | mnt.mnt_opts = mntopts ? mntopts : ""; | |
279 | mnt.mnt_freq = 0; | |
280 | mnt.mnt_passno = 0; | |
281 | ||
282 | fp = setmntent(MNTTAB, "a+"); | |
283 | if (!fp) { | |
284 | (void) fprintf(stderr, gettext( | |
285 | "filesystem '%s' was mounted, but %s " | |
286 | "could not be opened due to error %d\n"), | |
287 | dataset, MNTTAB, errno); | |
288 | return (MOUNT_FILEIO); | |
289 | } | |
290 | ||
291 | error = addmntent(fp, &mnt); | |
292 | if (error) { | |
293 | (void) fprintf(stderr, gettext( | |
294 | "filesystem '%s' was mounted, but %s " | |
295 | "could not be updated due to error %d\n"), | |
296 | dataset, MNTTAB, errno); | |
297 | return (MOUNT_FILEIO); | |
298 | } | |
299 | ||
300 | (void) endmntent(fp); | |
301 | ||
302 | return (MOUNT_SUCCESS); | |
303 | } | |
304 | ||
305 | int | |
306 | main(int argc, char **argv) | |
307 | { | |
308 | zfs_handle_t *zhp; | |
309 | char legacy[ZFS_MAXPROPLEN]; | |
310 | char mntopts[MNT_LINE_MAX] = { '\0' }; | |
311 | char badopt[MNT_LINE_MAX] = { '\0' }; | |
3aff7755 | 312 | char mtabopt[MNT_LINE_MAX] = { '\0' }; |
d53368f6 | 313 | char *dataset, *mntpoint; |
093aa692 | 314 | unsigned long mntflags = 0, zfsflags = 0, remount_ro = 0; |
d53368f6 BB |
315 | int sloppy = 0, fake = 0, verbose = 0, nomtab = 0, zfsutil = 0; |
316 | int error, c; | |
317 | ||
318 | (void) setlocale(LC_ALL, ""); | |
319 | (void) textdomain(TEXT_DOMAIN); | |
320 | ||
321 | opterr = 0; | |
322 | ||
323 | /* check options */ | |
324 | while ((c = getopt(argc, argv, "sfnvo:h?")) != -1) { | |
325 | switch (c) { | |
326 | case 's': | |
327 | sloppy = 1; | |
328 | break; | |
329 | case 'f': | |
330 | fake = 1; | |
331 | break; | |
332 | case 'n': | |
333 | nomtab = 1; | |
334 | break; | |
335 | case 'v': | |
336 | verbose++; | |
337 | break; | |
338 | case 'o': | |
339 | (void) strlcpy(mntopts, optarg, sizeof (mntopts)); | |
340 | break; | |
341 | case 'h': | |
342 | case '?': | |
343 | (void) fprintf(stderr, gettext("Invalid option '%c'\n"), | |
344 | optopt); | |
345 | (void) fprintf(stderr, gettext("Usage: mount.zfs " | |
346 | "[-sfnv] [-o options] <dataset> <mountpoint>\n")); | |
347 | return (MOUNT_USAGE); | |
348 | } | |
349 | } | |
350 | ||
351 | argc -= optind; | |
352 | argv += optind; | |
353 | ||
354 | /* check that we only have two arguments */ | |
355 | if (argc != 2) { | |
356 | if (argc == 0) | |
357 | (void) fprintf(stderr, gettext("missing dataset " | |
358 | "argument\n")); | |
359 | else if (argc == 1) | |
360 | (void) fprintf(stderr, | |
361 | gettext("missing mountpoint argument\n")); | |
362 | else | |
363 | (void) fprintf(stderr, gettext("too many arguments\n")); | |
364 | (void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n"); | |
365 | return (MOUNT_USAGE); | |
366 | } | |
367 | ||
368 | dataset = parse_dataset(argv[0]); | |
369 | mntpoint = argv[1]; | |
370 | ||
371 | /* validate mount options and set mntflags */ | |
3aff7755 BB |
372 | error = parse_options(mntopts, &mntflags, &zfsflags, sloppy, |
373 | badopt, mtabopt); | |
d53368f6 BB |
374 | if (error) { |
375 | switch (error) { | |
376 | case ENOMEM: | |
377 | (void) fprintf(stderr, gettext("filesystem '%s' " | |
378 | "cannot be mounted due to a memory allocation " | |
3aff7755 | 379 | "failure.\n"), dataset); |
d53368f6 | 380 | return (MOUNT_SYSERR); |
3aff7755 | 381 | case ENOENT: |
d53368f6 | 382 | (void) fprintf(stderr, gettext("filesystem '%s' " |
3aff7755 BB |
383 | "cannot be mounted of due invalid option " |
384 | "'%s'.\n"), dataset, badopt); | |
d53368f6 BB |
385 | (void) fprintf(stderr, gettext("Use the '-s' option " |
386 | "to ignore the bad mount option.\n")); | |
387 | return (MOUNT_USAGE); | |
388 | default: | |
389 | (void) fprintf(stderr, gettext("filesystem '%s' " | |
3aff7755 | 390 | "cannot be mounted due to internal error %d.\n"), |
d53368f6 BB |
391 | dataset, error); |
392 | return (MOUNT_SOFTWARE); | |
393 | } | |
394 | } | |
395 | ||
396 | #ifdef HAVE_LIBSELINUX | |
397 | /* | |
398 | * Automatically add the default zfs context when selinux is enabled | |
399 | * and the caller has not specified their own context. This must be | |
400 | * done until zfs is added to the default selinux policy configuration | |
401 | * as a known filesystem type which supports xattrs. | |
402 | */ | |
3aff7755 | 403 | if (is_selinux_enabled() && !(zfsflags & ZS_NOCONTEXT)) { |
d53368f6 BB |
404 | (void) strlcat(mntopts, ",context=\"system_u:" |
405 | "object_r:file_t:s0\"", sizeof (mntopts)); | |
3aff7755 BB |
406 | (void) strlcat(mtabopt, ",context=\"system_u:" |
407 | "object_r:file_t:s0\"", sizeof (mtabopt)); | |
408 | } | |
d53368f6 BB |
409 | #endif /* HAVE_LIBSELINUX */ |
410 | ||
411 | ||
412 | if (verbose) | |
413 | (void) fprintf(stdout, gettext("mount.zfs:\n" | |
414 | " dataset: \"%s\"\n mountpoint: \"%s\"\n" | |
415 | " mountflags: 0x%lx\n zfsflags: 0x%lx\n" | |
3aff7755 BB |
416 | " mountopts: \"%s\"\n mtabopts: \"%s\"\n"), |
417 | dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt); | |
d53368f6 BB |
418 | |
419 | if (mntflags & MS_REMOUNT) | |
420 | nomtab = 1; | |
421 | ||
093aa692 BB |
422 | if ((mntflags & MS_REMOUNT) && (mntflags & MS_RDONLY)) |
423 | remount_ro = 1; | |
424 | ||
425 | if (zfsflags & ZS_ZFSUTIL) | |
d53368f6 BB |
426 | zfsutil = 1; |
427 | ||
428 | if ((g_zfs = libzfs_init()) == NULL) | |
429 | return (MOUNT_SYSERR); | |
430 | ||
431 | /* try to open the dataset to access the mount point */ | |
3613204c BB |
432 | if ((zhp = zfs_open(g_zfs, dataset, |
433 | ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT)) == NULL) { | |
d53368f6 BB |
434 | (void) fprintf(stderr, gettext("filesystem '%s' cannot be " |
435 | "mounted, unable to open the dataset\n"), dataset); | |
436 | libzfs_fini(g_zfs); | |
437 | return (MOUNT_USAGE); | |
438 | } | |
439 | ||
3613204c BB |
440 | /* treat all snapshots as legacy mount points */ |
441 | if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT) | |
442 | (void) strlcpy(legacy, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN); | |
443 | else | |
444 | (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, legacy, | |
445 | sizeof (legacy), NULL, NULL, 0, B_FALSE); | |
d53368f6 BB |
446 | |
447 | zfs_close(zhp); | |
448 | libzfs_fini(g_zfs); | |
449 | ||
450 | /* | |
451 | * Legacy mount points may only be mounted using 'mount', never using | |
452 | * 'zfs mount'. However, since 'zfs mount' actually invokes 'mount' | |
453 | * we differentiate the two cases using the 'zfsutil' mount option. | |
454 | * This mount option should only be supplied by the 'zfs mount' util. | |
093aa692 BB |
455 | * |
456 | * The only exception to the above rule is '-o remount,ro'. This is | |
457 | * always allowed for non-legacy datasets for rc.sysinit/umountroot | |
458 | * to safely remount the root filesystem and flush its cache. | |
d53368f6 BB |
459 | */ |
460 | if (zfsutil && !strcmp(legacy, ZFS_MOUNTPOINT_LEGACY)) { | |
461 | (void) fprintf(stderr, gettext( | |
462 | "filesystem '%s' cannot be mounted using 'zfs mount'.\n" | |
463 | "Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n" | |
464 | "See zfs(8) for more information.\n"), | |
465 | dataset, mntpoint, dataset, mntpoint); | |
466 | return (MOUNT_USAGE); | |
467 | } | |
468 | ||
093aa692 | 469 | if (!zfsutil && strcmp(legacy, ZFS_MOUNTPOINT_LEGACY) && !remount_ro) { |
d53368f6 BB |
470 | (void) fprintf(stderr, gettext( |
471 | "filesystem '%s' cannot be mounted using 'mount'.\n" | |
472 | "Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n" | |
473 | "See zfs(8) for more information.\n"), | |
474 | dataset, "legacy", dataset); | |
475 | return (MOUNT_USAGE); | |
476 | } | |
477 | ||
478 | if (!fake) { | |
479 | error = mount(dataset, mntpoint, MNTTYPE_ZFS, | |
480 | mntflags, mntopts); | |
481 | if (error) { | |
482 | switch (errno) { | |
483 | case EBUSY: | |
484 | (void) fprintf(stderr, gettext("filesystem " | |
485 | "'%s' is already mounted\n"), dataset); | |
486 | return (MOUNT_SYSERR); | |
487 | default: | |
488 | (void) fprintf(stderr, gettext("filesystem " | |
489 | "'%s' can not be mounted due to error " | |
490 | "%d\n"), dataset, errno); | |
491 | return (MOUNT_USAGE); | |
492 | } | |
493 | } | |
494 | } | |
495 | ||
496 | if (!nomtab && mtab_is_writeable()) { | |
3aff7755 | 497 | error = mtab_update(dataset, mntpoint, MNTTYPE_ZFS, mtabopt); |
d53368f6 BB |
498 | if (error) |
499 | return (error); | |
500 | } | |
501 | ||
502 | return (MOUNT_SUCCESS); | |
503 | } |