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.
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.
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]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2011 Lawrence Livermore National Security, LLC.
30 #include <sys/mount.h>
31 #include <sys/mntent.h>
40 #define ZS_COMMENT 0x00000000 /* comment */
41 #define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */
43 libzfs_handle_t *g_zfs;
46 * Opportunistically convert a target string into a pool name. If the
47 * string does not represent a block device with a valid zfs label
48 * then it is passed through without modification.
51 parse_dataset(const char *target, char **dataset)
54 * Prior to util-linux 2.36.2, if a file or directory in the
55 * current working directory was named 'dataset' then mount(8)
56 * would prepend the current working directory to the dataset.
57 * Check for it and strip the prepended path when it is added.
60 if (getcwd(cwd, PATH_MAX) == NULL) {
64 int len = strlen(cwd);
65 if (strncmp(cwd, target, len) == 0)
68 /* Assume pool/dataset is more likely */
69 strlcpy(*dataset, target, PATH_MAX);
71 int fd = open(target, O_RDONLY | O_CLOEXEC);
76 if (zpool_read_label(fd, &cfg, NULL) == 0) {
78 if (!nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &nm))
79 strlcpy(*dataset, nm, PATH_MAX);
88 * Update the mtab_* code to use the libmount library when it is commonly
89 * available otherwise fallback to legacy mode. The mount(8) utility will
90 * manage the lock file for us to prevent racing updates to /etc/mtab.
93 mtab_is_writeable(void)
98 error = lstat("/etc/mtab", &st);
99 if (error || S_ISLNK(st.st_mode))
102 fd = open("/etc/mtab", O_RDWR | O_CREAT, 0644);
111 mtab_update(char *dataset, char *mntpoint, char *type, char *mntopts)
117 mnt.mnt_fsname = dataset;
118 mnt.mnt_dir = mntpoint;
120 mnt.mnt_opts = mntopts ? mntopts : "";
124 fp = setmntent("/etc/mtab", "a+");
126 (void) fprintf(stderr, gettext(
127 "filesystem '%s' was mounted, but /etc/mtab "
128 "could not be opened due to error: %s\n"),
129 dataset, strerror(errno));
130 return (MOUNT_FILEIO);
133 error = addmntent(fp, &mnt);
135 (void) fprintf(stderr, gettext(
136 "filesystem '%s' was mounted, but /etc/mtab "
137 "could not be updated due to error: %s\n"),
138 dataset, strerror(errno));
139 return (MOUNT_FILEIO);
142 (void) endmntent(fp);
144 return (MOUNT_SUCCESS);
148 main(int argc, char **argv)
151 char prop[ZFS_MAXPROPLEN];
152 uint64_t zfs_version = 0;
153 char mntopts[MNT_LINE_MAX] = { '\0' };
154 char badopt[MNT_LINE_MAX] = { '\0' };
155 char mtabopt[MNT_LINE_MAX] = { '\0' };
156 char mntpoint[PATH_MAX];
157 char dataset[PATH_MAX], *pdataset = dataset;
158 unsigned long mntflags = 0, zfsflags = 0, remount = 0;
159 int sloppy = 0, fake = 0, verbose = 0, nomtab = 0, zfsutil = 0;
162 (void) setlocale(LC_ALL, "");
163 (void) setlocale(LC_NUMERIC, "C");
164 (void) textdomain(TEXT_DOMAIN);
169 while ((c = getopt_long(argc, argv, "sfnvo:h?", 0, 0)) != -1) {
184 (void) strlcpy(mntopts, optarg, sizeof (mntopts));
189 (void) fprintf(stderr,
190 gettext("Invalid option '%c'\n"), optopt);
191 (void) fprintf(stderr, gettext("Usage: mount.zfs "
192 "[-sfnvh] [-o options] <dataset> <mountpoint>\n"));
193 return (MOUNT_USAGE);
200 /* check that we only have two arguments */
203 (void) fprintf(stderr, gettext("missing dataset "
206 (void) fprintf(stderr,
207 gettext("missing mountpoint argument\n"));
209 (void) fprintf(stderr, gettext("too many arguments\n"));
210 (void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
211 return (MOUNT_USAGE);
214 parse_dataset(argv[0], &pdataset);
216 /* canonicalize the mount point */
217 if (realpath(argv[1], mntpoint) == NULL) {
218 (void) fprintf(stderr, gettext("filesystem '%s' cannot be "
219 "mounted at '%s' due to canonicalization error: %s\n"),
220 dataset, argv[1], strerror(errno));
221 return (MOUNT_SYSERR);
224 /* validate mount options and set mntflags */
225 error = zfs_parse_mount_options(mntopts, &mntflags, &zfsflags, sloppy,
230 (void) fprintf(stderr, gettext("filesystem '%s' "
231 "cannot be mounted due to a memory allocation "
232 "failure.\n"), dataset);
233 return (MOUNT_SYSERR);
235 (void) fprintf(stderr, gettext("filesystem '%s' "
236 "cannot be mounted due to invalid option "
237 "'%s'.\n"), dataset, badopt);
238 (void) fprintf(stderr, gettext("Use the '-s' option "
239 "to ignore the bad mount option.\n"));
240 return (MOUNT_USAGE);
242 (void) fprintf(stderr, gettext("filesystem '%s' "
243 "cannot be mounted due to internal error %d.\n"),
245 return (MOUNT_SOFTWARE);
249 if (mntflags & MS_REMOUNT) {
254 if (zfsflags & ZS_ZFSUTIL)
257 if ((g_zfs = libzfs_init()) == NULL) {
258 (void) fprintf(stderr, "%s\n", libzfs_error_init(errno));
259 return (MOUNT_SYSERR);
262 /* try to open the dataset to access the mount point */
263 if ((zhp = zfs_open(g_zfs, dataset,
264 ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT)) == NULL) {
265 (void) fprintf(stderr, gettext("filesystem '%s' cannot be "
266 "mounted, unable to open the dataset\n"), dataset);
268 return (MOUNT_USAGE);
271 if (!zfsutil || sloppy ||
272 libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) {
273 zfs_adjust_mount_options(zhp, mntpoint, mntopts, mtabopt);
276 /* treat all snapshots as legacy mount points */
277 if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT)
278 (void) strlcpy(prop, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN);
280 (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop,
281 sizeof (prop), NULL, NULL, 0, B_FALSE);
284 * Fetch the max supported zfs version in case we get ENOTSUP
285 * back from the mount command, since we need the zfs handle
288 zfs_version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
289 if (zfs_version == 0) {
290 fprintf(stderr, gettext("unable to fetch "
291 "ZFS version for filesystem '%s'\n"), dataset);
294 return (MOUNT_SYSERR);
298 * Legacy mount points may only be mounted using 'mount', never using
299 * 'zfs mount'. However, since 'zfs mount' actually invokes 'mount'
300 * we differentiate the two cases using the 'zfsutil' mount option.
301 * This mount option should only be supplied by the 'zfs mount' util.
303 * The only exception to the above rule is '-o remount' which is
304 * always allowed for non-legacy datasets. This is done because when
305 * using zfs as your root file system both rc.sysinit/umountroot and
306 * systemd depend on 'mount -o remount <mountpoint>' to work.
308 if (zfsutil && (strcmp(prop, ZFS_MOUNTPOINT_LEGACY) == 0)) {
309 (void) fprintf(stderr, gettext(
310 "filesystem '%s' cannot be mounted using 'zfs mount'.\n"
311 "Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n"
312 "See zfs(8) for more information.\n"),
313 dataset, mntpoint, dataset, mntpoint);
316 return (MOUNT_USAGE);
319 if (!zfsutil && !(remount || fake) &&
320 strcmp(prop, ZFS_MOUNTPOINT_LEGACY)) {
321 (void) fprintf(stderr, gettext(
322 "filesystem '%s' cannot be mounted using 'mount'.\n"
323 "Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n"
324 "See zfs(8) for more information.\n"),
325 dataset, "legacy", dataset);
328 return (MOUNT_USAGE);
332 (void) fprintf(stdout, gettext("mount.zfs:\n"
333 " dataset: \"%s\"\n mountpoint: \"%s\"\n"
334 " mountflags: 0x%lx\n zfsflags: 0x%lx\n"
335 " mountopts: \"%s\"\n mtabopts: \"%s\"\n"),
336 dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt);
339 if (zfsutil && !sloppy &&
340 !libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) {
341 error = zfs_mount_at(zhp, mntopts, mntflags, mntpoint);
343 (void) fprintf(stderr, "zfs_mount_at() failed: "
344 "%s", libzfs_error_description(g_zfs));
347 return (MOUNT_SYSERR);
350 error = mount(dataset, mntpoint, MNTTYPE_ZFS,
361 (void) fprintf(stderr, gettext("mount point "
362 "'%s' does not exist\n"), mntpoint);
363 return (MOUNT_SYSERR);
365 (void) fprintf(stderr, gettext("filesystem "
366 "'%s' is already mounted\n"), dataset);
369 if (zfs_version > ZPL_VERSION) {
370 (void) fprintf(stderr,
371 gettext("filesystem '%s' (v%d) is not "
372 "supported by this implementation of "
373 "ZFS (max v%d).\n"), dataset,
374 (int)zfs_version, (int)ZPL_VERSION);
376 (void) fprintf(stderr,
377 gettext("filesystem '%s' mount "
378 "failed for unknown reason.\n"), dataset);
380 return (MOUNT_SYSERR);
383 if (mntflags & MS_MANDLOCK) {
384 (void) fprintf(stderr, gettext("filesystem "
385 "'%s' has the 'nbmand=on' property set, "
386 "this mount\noption may be disabled in "
387 "your kernel. Use 'zfs set nbmand=off'\n"
388 "to disable this option and try to "
389 "mount the filesystem again.\n"), dataset);
390 return (MOUNT_SYSERR);
395 (void) fprintf(stderr, gettext("filesystem "
396 "'%s' can not be mounted: %s\n"), dataset,
398 return (MOUNT_USAGE);
402 if (!nomtab && mtab_is_writeable()) {
403 error = mtab_update(dataset, mntpoint, MNTTYPE_ZFS, mtabopt);
408 return (MOUNT_SUCCESS);