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 2015 Nexenta Systems, Inc. All rights reserved.
24 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Copyright (c) 2014, 2016 by Delphix. All rights reserved.
26 * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
27 * Copyright 2017 Joyent, Inc.
28 * Copyright 2017 RackTop Systems.
29 */
30
31 /*
32 * Routines to manage ZFS mounts. We separate all the nasty routines that have
33 * to deal with the OS. The following functions are the main entry points --
34 * they are used by mount and unmount and when changing a filesystem's
35 * mountpoint.
36 *
37 * zfs_is_mounted()
38 * zfs_mount()
39 * zfs_unmount()
40 * zfs_unmountall()
41 *
42 * This file also contains the functions used to manage sharing filesystems via
43 * NFS and iSCSI:
44 *
45 * zfs_is_shared()
46 * zfs_share()
47 * zfs_unshare()
48 *
49 * zfs_is_shared_nfs()
50 * zfs_is_shared_smb()
51 * zfs_share_proto()
52 * zfs_shareall();
53 * zfs_unshare_nfs()
54 * zfs_unshare_smb()
55 * zfs_unshareall_nfs()
56 * zfs_unshareall_smb()
57 * zfs_unshareall()
58 * zfs_unshareall_bypath()
59 *
60 * The following functions are available for pool consumers, and will
61 * mount/unmount and share/unshare all datasets within pool:
62 *
63 * zpool_enable_datasets()
64 * zpool_disable_datasets()
65 */
66
67 #include <dirent.h>
68 #include <dlfcn.h>
69 #include <errno.h>
70 #include <fcntl.h>
71 #include <libgen.h>
72 #include <libintl.h>
73 #include <stdio.h>
74 #include <stdlib.h>
75 #include <strings.h>
76 #include <unistd.h>
77 #include <zone.h>
78 #include <sys/mntent.h>
79 #include <sys/mount.h>
80 #include <sys/stat.h>
81 #include <sys/statvfs.h>
82
83 #include <libzfs.h>
84
85 #include "libzfs_impl.h"
86
87 #include <libshare.h>
88 #include <sys/systeminfo.h>
89 #define MAXISALEN 257 /* based on sysinfo(2) man page */
90
91 static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
92 zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
93 zfs_share_proto_t);
94
95 /*
96 * The share protocols table must be in the same order as the zfs_share_proto_t
97 * enum in libzfs_impl.h
98 */
99 typedef struct {
100 zfs_prop_t p_prop;
101 char *p_name;
102 int p_share_err;
103 int p_unshare_err;
104 } proto_table_t;
105
106 proto_table_t proto_table[PROTO_END] = {
107 {ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
108 {ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
109 };
110
111 zfs_share_proto_t nfs_only[] = {
112 PROTO_NFS,
113 PROTO_END
114 };
115
116 zfs_share_proto_t smb_only[] = {
117 PROTO_SMB,
118 PROTO_END
119 };
120 zfs_share_proto_t share_all_proto[] = {
121 PROTO_NFS,
122 PROTO_SMB,
123 PROTO_END
124 };
125
126 /*
127 * Search the sharetab for the given mountpoint and protocol, returning
128 * a zfs_share_type_t value.
129 */
130 static zfs_share_type_t
131 is_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto)
132 {
133 char buf[MAXPATHLEN], *tab;
134 char *ptr;
135
136 if (hdl->libzfs_sharetab == NULL)
137 return (SHARED_NOT_SHARED);
138
139 (void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
140
141 while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
142
143 /* the mountpoint is the first entry on each line */
144 if ((tab = strchr(buf, '\t')) == NULL)
145 continue;
146
147 *tab = '\0';
148 if (strcmp(buf, mountpoint) == 0) {
149 /*
150 * the protocol field is the third field
151 * skip over second field
152 */
153 ptr = ++tab;
154 if ((tab = strchr(ptr, '\t')) == NULL)
155 continue;
156 ptr = ++tab;
157 if ((tab = strchr(ptr, '\t')) == NULL)
158 continue;
159 *tab = '\0';
160 if (strcmp(ptr,
161 proto_table[proto].p_name) == 0) {
162 switch (proto) {
163 case PROTO_NFS:
164 return (SHARED_NFS);
165 case PROTO_SMB:
166 return (SHARED_SMB);
167 default:
168 return (0);
169 }
170 }
171 }
172 }
173
174 return (SHARED_NOT_SHARED);
175 }
176
177 static boolean_t
178 dir_is_empty_stat(const char *dirname)
179 {
180 struct stat st;
181
182 /*
183 * We only want to return false if the given path is a non empty
184 * directory, all other errors are handled elsewhere.
185 */
186 if (stat(dirname, &st) < 0 || !S_ISDIR(st.st_mode)) {
187 return (B_TRUE);
188 }
189
190 /*
191 * An empty directory will still have two entries in it, one
192 * entry for each of "." and "..".
193 */
194 if (st.st_size > 2) {
195 return (B_FALSE);
196 }
197
198 return (B_TRUE);
199 }
200
201 static boolean_t
202 dir_is_empty_readdir(const char *dirname)
203 {
204 DIR *dirp;
205 struct dirent64 *dp;
206 int dirfd;
207
208 if ((dirfd = openat(AT_FDCWD, dirname,
209 O_RDONLY | O_NDELAY | O_LARGEFILE | O_CLOEXEC, 0)) < 0) {
210 return (B_TRUE);
211 }
212
213 if ((dirp = fdopendir(dirfd)) == NULL) {
214 (void) close(dirfd);
215 return (B_TRUE);
216 }
217
218 while ((dp = readdir64(dirp)) != NULL) {
219
220 if (strcmp(dp->d_name, ".") == 0 ||
221 strcmp(dp->d_name, "..") == 0)
222 continue;
223
224 (void) closedir(dirp);
225 return (B_FALSE);
226 }
227
228 (void) closedir(dirp);
229 return (B_TRUE);
230 }
231
232 /*
233 * Returns true if the specified directory is empty. If we can't open the
234 * directory at all, return true so that the mount can fail with a more
235 * informative error message.
236 */
237 static boolean_t
238 dir_is_empty(const char *dirname)
239 {
240 struct statvfs64 st;
241
242 /*
243 * If the statvfs call fails or the filesystem is not a ZFS
244 * filesystem, fall back to the slow path which uses readdir.
245 */
246 if ((statvfs64(dirname, &st) != 0) ||
247 (strcmp(st.f_basetype, "zfs") != 0)) {
248 return (dir_is_empty_readdir(dirname));
249 }
250
251 /*
252 * At this point, we know the provided path is on a ZFS
253 * filesystem, so we can use stat instead of readdir to
254 * determine if the directory is empty or not. We try to avoid
255 * using readdir because that requires opening "dirname"; this
256 * open file descriptor can potentially end up in a child
257 * process if there's a concurrent fork, thus preventing the
258 * zfs_mount() from otherwise succeeding (the open file
259 * descriptor inherited by the child process will cause the
260 * parent's mount to fail with EBUSY). The performance
261 * implications of replacing the open, read, and close with a
262 * single stat is nice; but is not the main motivation for the
263 * added complexity.
264 */
265 return (dir_is_empty_stat(dirname));
266 }
267
268 /*
269 * Checks to see if the mount is active. If the filesystem is mounted, we fill
270 * in 'where' with the current mountpoint, and return 1. Otherwise, we return
271 * 0.
272 */
273 boolean_t
274 is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
275 {
276 struct mnttab entry;
277
278 if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0)
279 return (B_FALSE);
280
281 if (where != NULL)
282 *where = zfs_strdup(zfs_hdl, entry.mnt_mountp);
283
284 return (B_TRUE);
285 }
286
287 boolean_t
288 zfs_is_mounted(zfs_handle_t *zhp, char **where)
289 {
290 return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where));
291 }
292
293 /*
294 * Returns true if the given dataset is mountable, false otherwise. Returns the
295 * mountpoint in 'buf'.
296 */
297 static boolean_t
298 zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
299 zprop_source_t *source)
300 {
301 char sourceloc[MAXNAMELEN];
302 zprop_source_t sourcetype;
303
304 if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
305 return (B_FALSE);
306
307 verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
308 &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);
309
310 if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 ||
311 strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0)
312 return (B_FALSE);
313
314 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF)
315 return (B_FALSE);
316
317 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
318 getzoneid() == GLOBAL_ZONEID)
319 return (B_FALSE);
320
321 if (source)
322 *source = sourcetype;
323
324 return (B_TRUE);
325 }
326
327 /*
328 * Mount the given filesystem.
329 */
330 int
331 zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
332 {
333 struct stat buf;
334 char mountpoint[ZFS_MAXPROPLEN];
335 char mntopts[MNT_LINE_MAX];
336 libzfs_handle_t *hdl = zhp->zfs_hdl;
337
338 if (options == NULL)
339 mntopts[0] = '\0';
340 else
341 (void) strlcpy(mntopts, options, sizeof (mntopts));
342
343 /*
344 * If the pool is imported read-only then all mounts must be read-only
345 */
346 if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
347 flags |= MS_RDONLY;
348
349 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
350 return (0);
351
352 /* Create the directory if it doesn't already exist */
353 if (lstat(mountpoint, &buf) != 0) {
354 if (mkdirp(mountpoint, 0755) != 0) {
355 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
356 "failed to create mountpoint"));
357 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
358 dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
359 mountpoint));
360 }
361 }
362
363 /*
364 * Determine if the mountpoint is empty. If so, refuse to perform the
365 * mount. We don't perform this check if MS_OVERLAY is specified, which
366 * would defeat the point. We also avoid this check if 'remount' is
367 * specified.
368 */
369 if ((flags & MS_OVERLAY) == 0 &&
370 strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
371 !dir_is_empty(mountpoint)) {
372 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
373 "directory is not empty"));
374 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
375 dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
376 }
377
378 /* perform the mount */
379 if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
380 MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
381 /*
382 * Generic errors are nasty, but there are just way too many
383 * from mount(), and they're well-understood. We pick a few
384 * common ones to improve upon.
385 */
386 if (errno == EBUSY) {
387 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
388 "mountpoint or dataset is busy"));
389 } else if (errno == EPERM) {
390 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
391 "Insufficient privileges"));
392 } else if (errno == ENOTSUP) {
393 char buf[256];
394 int spa_version;
395
396 VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
397 (void) snprintf(buf, sizeof (buf),
398 dgettext(TEXT_DOMAIN, "Can't mount a version %lld "
399 "file system on a version %d pool. Pool must be"
400 " upgraded to mount this file system."),
401 (u_longlong_t)zfs_prop_get_int(zhp,
402 ZFS_PROP_VERSION), spa_version);
403 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
404 } else {
405 zfs_error_aux(hdl, strerror(errno));
406 }
407 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
408 dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
409 zhp->zfs_name));
410 }
411
412 /* add the mounted entry into our cache */
413 libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint,
414 mntopts);
415 return (0);
416 }
417
418 /*
419 * Unmount a single filesystem.
420 */
421 static int
422 unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
423 {
424 if (umount2(mountpoint, flags) != 0) {
425 zfs_error_aux(hdl, strerror(errno));
426 return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
427 dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
428 mountpoint));
429 }
430
431 return (0);
432 }
433
434 /*
435 * Unmount the given filesystem.
436 */
437 int
438 zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
439 {
440 libzfs_handle_t *hdl = zhp->zfs_hdl;
441 struct mnttab entry;
442 char *mntpt = NULL;
443
444 /* check to see if we need to unmount the filesystem */
445 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
446 libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) {
447 /*
448 * mountpoint may have come from a call to
449 * getmnt/getmntany if it isn't NULL. If it is NULL,
450 * we know it comes from libzfs_mnttab_find which can
451 * then get freed later. We strdup it to play it safe.
452 */
453 if (mountpoint == NULL)
454 mntpt = zfs_strdup(hdl, entry.mnt_mountp);
455 else
456 mntpt = zfs_strdup(hdl, mountpoint);
457
458 /*
459 * Unshare and unmount the filesystem
460 */
461 if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0)
462 return (-1);
463
464 if (unmount_one(hdl, mntpt, flags) != 0) {
465 free(mntpt);
466 (void) zfs_shareall(zhp);
467 return (-1);
468 }
469 libzfs_mnttab_remove(hdl, zhp->zfs_name);
470 free(mntpt);
471 }
472
473 return (0);
474 }
475
476 /*
477 * Unmount this filesystem and any children inheriting the mountpoint property.
478 * To do this, just act like we're changing the mountpoint property, but don't
479 * remount the filesystems afterwards.
480 */
481 int
482 zfs_unmountall(zfs_handle_t *zhp, int flags)
483 {
484 prop_changelist_t *clp;
485 int ret;
486
487 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 0, flags);
488 if (clp == NULL)
489 return (-1);
490
491 ret = changelist_prefix(clp);
492 changelist_free(clp);
493
494 return (ret);
495 }
496
497 boolean_t
498 zfs_is_shared(zfs_handle_t *zhp)
499 {
500 zfs_share_type_t rc = 0;
501 zfs_share_proto_t *curr_proto;
502
503 if (ZFS_IS_VOLUME(zhp))
504 return (B_FALSE);
505
506 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
507 curr_proto++)
508 rc |= zfs_is_shared_proto(zhp, NULL, *curr_proto);
509
510 return (rc ? B_TRUE : B_FALSE);
511 }
512
513 int
514 zfs_share(zfs_handle_t *zhp)
515 {
516 assert(!ZFS_IS_VOLUME(zhp));
517 return (zfs_share_proto(zhp, share_all_proto));
518 }
519
520 int
521 zfs_unshare(zfs_handle_t *zhp)
522 {
523 assert(!ZFS_IS_VOLUME(zhp));
524 return (zfs_unshareall(zhp));
525 }
526
527 /*
528 * Check to see if the filesystem is currently shared.
529 */
530 zfs_share_type_t
531 zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto)
532 {
533 char *mountpoint;
534 zfs_share_type_t rc;
535
536 if (!zfs_is_mounted(zhp, &mountpoint))
537 return (SHARED_NOT_SHARED);
538
539 if ((rc = is_shared(zhp->zfs_hdl, mountpoint, proto))
540 != SHARED_NOT_SHARED) {
541 if (where != NULL)
542 *where = mountpoint;
543 else
544 free(mountpoint);
545 return (rc);
546 } else {
547 free(mountpoint);
548 return (SHARED_NOT_SHARED);
549 }
550 }
551
552 boolean_t
553 zfs_is_shared_nfs(zfs_handle_t *zhp, char **where)
554 {
555 return (zfs_is_shared_proto(zhp, where,
556 PROTO_NFS) != SHARED_NOT_SHARED);
557 }
558
559 boolean_t
560 zfs_is_shared_smb(zfs_handle_t *zhp, char **where)
561 {
562 return (zfs_is_shared_proto(zhp, where,
563 PROTO_SMB) != SHARED_NOT_SHARED);
564 }
565
566 /*
567 * Make sure things will work if libshare isn't installed by using
568 * wrapper functions that check to see that the pointers to functions
569 * initialized in _zfs_init_libshare() are actually present.
570 */
571
572 static sa_handle_t (*_sa_init)(int);
573 static sa_handle_t (*_sa_init_arg)(int, void *);
574 static void (*_sa_fini)(sa_handle_t);
575 static sa_share_t (*_sa_find_share)(sa_handle_t, char *);
576 static int (*_sa_enable_share)(sa_share_t, char *);
577 static int (*_sa_disable_share)(sa_share_t, char *);
578 static char *(*_sa_errorstr)(int);
579 static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *);
580 static boolean_t (*_sa_needs_refresh)(sa_handle_t *);
581 static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t);
582 static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t,
583 char *, char *, zprop_source_t, char *, char *, char *);
584 static void (*_sa_update_sharetab_ts)(sa_handle_t);
585
586 /*
587 * _zfs_init_libshare()
588 *
589 * Find the libshare.so.1 entry points that we use here and save the
590 * values to be used later. This is triggered by the runtime loader.
591 * Make sure the correct ISA version is loaded.
592 */
593
594 #pragma init(_zfs_init_libshare)
595 static void
596 _zfs_init_libshare(void)
597 {
598 void *libshare;
599 char path[MAXPATHLEN];
600 char isa[MAXISALEN];
601
602 #if defined(_LP64)
603 if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1)
604 isa[0] = '\0';
605 #else
606 isa[0] = '\0';
607 #endif
608 (void) snprintf(path, MAXPATHLEN,
609 "/usr/lib/%s/libshare.so.1", isa);
610
611 if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) {
612 _sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init");
613 _sa_init_arg = (sa_handle_t (*)(int, void *))dlsym(libshare,
614 "sa_init_arg");
615 _sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini");
616 _sa_find_share = (sa_share_t (*)(sa_handle_t, char *))
617 dlsym(libshare, "sa_find_share");
618 _sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
619 "sa_enable_share");
620 _sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
621 "sa_disable_share");
622 _sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr");
623 _sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *))
624 dlsym(libshare, "sa_parse_legacy_options");
625 _sa_needs_refresh = (boolean_t (*)(sa_handle_t *))
626 dlsym(libshare, "sa_needs_refresh");
627 _sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t))
628 dlsym(libshare, "sa_get_zfs_handle");
629 _sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t,
630 sa_share_t, char *, char *, zprop_source_t, char *,
631 char *, char *))dlsym(libshare, "sa_zfs_process_share");
632 _sa_update_sharetab_ts = (void (*)(sa_handle_t))
633 dlsym(libshare, "sa_update_sharetab_ts");
634 if (_sa_init == NULL || _sa_init_arg == NULL ||
635 _sa_fini == NULL || _sa_find_share == NULL ||
636 _sa_enable_share == NULL || _sa_disable_share == NULL ||
637 _sa_errorstr == NULL || _sa_parse_legacy_options == NULL ||
638 _sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL ||
639 _sa_zfs_process_share == NULL ||
640 _sa_update_sharetab_ts == NULL) {
641 _sa_init = NULL;
642 _sa_init_arg = NULL;
643 _sa_fini = NULL;
644 _sa_disable_share = NULL;
645 _sa_enable_share = NULL;
646 _sa_errorstr = NULL;
647 _sa_parse_legacy_options = NULL;
648 (void) dlclose(libshare);
649 _sa_needs_refresh = NULL;
650 _sa_get_zfs_handle = NULL;
651 _sa_zfs_process_share = NULL;
652 _sa_update_sharetab_ts = NULL;
653 }
654 }
655 }
656
657 /*
658 * zfs_init_libshare(zhandle, service)
659 *
660 * Initialize the libshare API if it hasn't already been initialized.
661 * In all cases it returns 0 if it succeeded and an error if not. The
662 * service value is which part(s) of the API to initialize and is a
663 * direct map to the libshare sa_init(service) interface.
664 */
665 static int
666 zfs_init_libshare_impl(libzfs_handle_t *zhandle, int service, void *arg)
667 {
668 /*
669 * libshare is either not installed or we're in a branded zone. The
670 * rest of the wrapper functions around the libshare calls already
671 * handle NULL function pointers, but we don't want the callers of
672 * zfs_init_libshare() to fail prematurely if libshare is not available.
673 */
674 if (_sa_init == NULL)
675 return (SA_OK);
676
677 /*
678 * Attempt to refresh libshare. This is necessary if there was a cache
679 * miss for a new ZFS dataset that was just created, or if state of the
680 * sharetab file has changed since libshare was last initialized. We
681 * want to make sure so check timestamps to see if a different process
682 * has updated any of the configuration. If there was some non-ZFS
683 * change, we need to re-initialize the internal cache.
684 */
685 if (_sa_needs_refresh != NULL &&
686 _sa_needs_refresh(zhandle->libzfs_sharehdl)) {
687 zfs_uninit_libshare(zhandle);
688 zhandle->libzfs_sharehdl = _sa_init_arg(service, arg);
689 }
690
691 if (zhandle && zhandle->libzfs_sharehdl == NULL)
692 zhandle->libzfs_sharehdl = _sa_init_arg(service, arg);
693
694 if (zhandle->libzfs_sharehdl == NULL)
695 return (SA_NO_MEMORY);
696
697 return (SA_OK);
698 }
699 int
700 zfs_init_libshare(libzfs_handle_t *zhandle, int service)
701 {
702 return (zfs_init_libshare_impl(zhandle, service, NULL));
703 }
704
705 int
706 zfs_init_libshare_arg(libzfs_handle_t *zhandle, int service, void *arg)
707 {
708 return (zfs_init_libshare_impl(zhandle, service, arg));
709 }
710
711
712 /*
713 * zfs_uninit_libshare(zhandle)
714 *
715 * Uninitialize the libshare API if it hasn't already been
716 * uninitialized. It is OK to call multiple times.
717 */
718 void
719 zfs_uninit_libshare(libzfs_handle_t *zhandle)
720 {
721 if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) {
722 if (_sa_fini != NULL)
723 _sa_fini(zhandle->libzfs_sharehdl);
724 zhandle->libzfs_sharehdl = NULL;
725 }
726 }
727
728 /*
729 * zfs_parse_options(options, proto)
730 *
731 * Call the legacy parse interface to get the protocol specific
732 * options using the NULL arg to indicate that this is a "parse" only.
733 */
734 int
735 zfs_parse_options(char *options, zfs_share_proto_t proto)
736 {
737 if (_sa_parse_legacy_options != NULL) {
738 return (_sa_parse_legacy_options(NULL, options,
739 proto_table[proto].p_name));
740 }
741 return (SA_CONFIG_ERR);
742 }
743
744 /*
745 * zfs_sa_find_share(handle, path)
746 *
747 * wrapper around sa_find_share to find a share path in the
748 * configuration.
749 */
750 static sa_share_t
751 zfs_sa_find_share(sa_handle_t handle, char *path)
752 {
753 if (_sa_find_share != NULL)
754 return (_sa_find_share(handle, path));
755 return (NULL);
756 }
757
758 /*
759 * zfs_sa_enable_share(share, proto)
760 *
761 * Wrapper for sa_enable_share which enables a share for a specified
762 * protocol.
763 */
764 static int
765 zfs_sa_enable_share(sa_share_t share, char *proto)
766 {
767 if (_sa_enable_share != NULL)
768 return (_sa_enable_share(share, proto));
769 return (SA_CONFIG_ERR);
770 }
771
772 /*
773 * zfs_sa_disable_share(share, proto)
774 *
775 * Wrapper for sa_enable_share which disables a share for a specified
776 * protocol.
777 */
778 static int
779 zfs_sa_disable_share(sa_share_t share, char *proto)
780 {
781 if (_sa_disable_share != NULL)
782 return (_sa_disable_share(share, proto));
783 return (SA_CONFIG_ERR);
784 }
785
786 /*
787 * Share the given filesystem according to the options in the specified
788 * protocol specific properties (sharenfs, sharesmb). We rely
789 * on "libshare" to the dirty work for us.
790 */
791 static int
792 zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
793 {
794 char mountpoint[ZFS_MAXPROPLEN];
795 char shareopts[ZFS_MAXPROPLEN];
796 char sourcestr[ZFS_MAXPROPLEN];
797 libzfs_handle_t *hdl = zhp->zfs_hdl;
798 sa_share_t share;
799 zfs_share_proto_t *curr_proto;
800 zprop_source_t sourcetype;
801 int ret;
802
803 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
804 return (0);
805
806 for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
807 /*
808 * Return success if there are no share options.
809 */
810 if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
811 shareopts, sizeof (shareopts), &sourcetype, sourcestr,
812 ZFS_MAXPROPLEN, B_FALSE) != 0 ||
813 strcmp(shareopts, "off") == 0)
814 continue;
815 ret = zfs_init_libshare_arg(hdl, SA_INIT_ONE_SHARE_FROM_HANDLE,
816 zhp);
817 if (ret != SA_OK) {
818 (void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
819 dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
820 zfs_get_name(zhp), _sa_errorstr != NULL ?
821 _sa_errorstr(ret) : "");
822 return (-1);
823 }
824
825 /*
826 * If the 'zoned' property is set, then zfs_is_mountable()
827 * will have already bailed out if we are in the global zone.
828 * But local zones cannot be NFS servers, so we ignore it for
829 * local zones as well.
830 */
831 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
832 continue;
833
834 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint);
835 if (share == NULL) {
836 /*
837 * This may be a new file system that was just
838 * created so isn't in the internal cache
839 * (second time through). Rather than
840 * reloading the entire configuration, we can
841 * assume ZFS has done the checking and it is
842 * safe to add this to the internal
843 * configuration.
844 */
845 if (_sa_zfs_process_share(hdl->libzfs_sharehdl,
846 NULL, NULL, mountpoint,
847 proto_table[*curr_proto].p_name, sourcetype,
848 shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
849 (void) zfs_error_fmt(hdl,
850 proto_table[*curr_proto].p_share_err,
851 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
852 zfs_get_name(zhp));
853 return (-1);
854 }
855 share = zfs_sa_find_share(hdl->libzfs_sharehdl,
856 mountpoint);
857 }
858 if (share != NULL) {
859 int err;
860 err = zfs_sa_enable_share(share,
861 proto_table[*curr_proto].p_name);
862 if (err != SA_OK) {
863 (void) zfs_error_fmt(hdl,
864 proto_table[*curr_proto].p_share_err,
865 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
866 zfs_get_name(zhp));
867 return (-1);
868 }
869 } else {
870 (void) zfs_error_fmt(hdl,
871 proto_table[*curr_proto].p_share_err,
872 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
873 zfs_get_name(zhp));
874 return (-1);
875 }
876
877 }
878 return (0);
879 }
880
881
882 int
883 zfs_share_nfs(zfs_handle_t *zhp)
884 {
885 return (zfs_share_proto(zhp, nfs_only));
886 }
887
888 int
889 zfs_share_smb(zfs_handle_t *zhp)
890 {
891 return (zfs_share_proto(zhp, smb_only));
892 }
893
894 int
895 zfs_shareall(zfs_handle_t *zhp)
896 {
897 return (zfs_share_proto(zhp, share_all_proto));
898 }
899
900 /*
901 * Unshare a filesystem by mountpoint.
902 */
903 static int
904 unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
905 zfs_share_proto_t proto)
906 {
907 sa_share_t share;
908 int err;
909 char *mntpt;
910
911 /*
912 * Mountpoint could get trashed if libshare calls getmntany
913 * which it does during API initialization, so strdup the
914 * value.
915 */
916 mntpt = zfs_strdup(hdl, mountpoint);
917
918 /*
919 * make sure libshare initialized, initialize everything because we
920 * don't know what other unsharing may happen later. Functions up the
921 * stack are allowed to initialize instead a subset of shares at the
922 * time the set is known.
923 */
924 if ((err = zfs_init_libshare_arg(hdl, SA_INIT_ONE_SHARE_FROM_NAME,
925 (void *)name)) != SA_OK) {
926 free(mntpt); /* don't need the copy anymore */
927 return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
928 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
929 name, _sa_errorstr(err)));
930 }
931
932 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mntpt);
933 free(mntpt); /* don't need the copy anymore */
934
935 if (share != NULL) {
936 err = zfs_sa_disable_share(share, proto_table[proto].p_name);
937 if (err != SA_OK) {
938 return (zfs_error_fmt(hdl,
939 proto_table[proto].p_unshare_err,
940 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
941 name, _sa_errorstr(err)));
942 }
943 } else {
944 return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
945 dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
946 name));
947 }
948 return (0);
949 }
950
951 /*
952 * Unshare the given filesystem.
953 */
954 int
955 zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint,
956 zfs_share_proto_t *proto)
957 {
958 libzfs_handle_t *hdl = zhp->zfs_hdl;
959 struct mnttab entry;
960 char *mntpt = NULL;
961
962 /* check to see if need to unmount the filesystem */
963 rewind(zhp->zfs_hdl->libzfs_mnttab);
964 if (mountpoint != NULL)
965 mountpoint = mntpt = zfs_strdup(hdl, mountpoint);
966
967 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
968 libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) {
969 zfs_share_proto_t *curr_proto;
970
971 if (mountpoint == NULL)
972 mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
973
974 for (curr_proto = proto; *curr_proto != PROTO_END;
975 curr_proto++) {
976
977 if (is_shared(hdl, mntpt, *curr_proto) &&
978 unshare_one(hdl, zhp->zfs_name,
979 mntpt, *curr_proto) != 0) {
980 if (mntpt != NULL)
981 free(mntpt);
982 return (-1);
983 }
984 }
985 }
986 if (mntpt != NULL)
987 free(mntpt);
988
989 return (0);
990 }
991
992 int
993 zfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint)
994 {
995 return (zfs_unshare_proto(zhp, mountpoint, nfs_only));
996 }
997
998 int
999 zfs_unshare_smb(zfs_handle_t *zhp, const char *mountpoint)
1000 {
1001 return (zfs_unshare_proto(zhp, mountpoint, smb_only));
1002 }
1003
1004 /*
1005 * Same as zfs_unmountall(), but for NFS and SMB unshares.
1006 */
1007 int
1008 zfs_unshareall_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
1009 {
1010 prop_changelist_t *clp;
1011 int ret;
1012
1013 clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0);
1014 if (clp == NULL)
1015 return (-1);
1016
1017 ret = changelist_unshare(clp, proto);
1018 changelist_free(clp);
1019
1020 return (ret);
1021 }
1022
1023 int
1024 zfs_unshareall_nfs(zfs_handle_t *zhp)
1025 {
1026 return (zfs_unshareall_proto(zhp, nfs_only));
1027 }
1028
1029 int
1030 zfs_unshareall_smb(zfs_handle_t *zhp)
1031 {
1032 return (zfs_unshareall_proto(zhp, smb_only));
1033 }
1034
1035 int
1036 zfs_unshareall(zfs_handle_t *zhp)
1037 {
1038 return (zfs_unshareall_proto(zhp, share_all_proto));
1039 }
1040
1041 int
1042 zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint)
1043 {
1044 return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
1045 }
1046
1047 /*
1048 * Remove the mountpoint associated with the current dataset, if necessary.
1049 * We only remove the underlying directory if:
1050 *
1051 * - The mountpoint is not 'none' or 'legacy'
1052 * - The mountpoint is non-empty
1053 * - The mountpoint is the default or inherited
1054 * - The 'zoned' property is set, or we're in a local zone
1055 *
1056 * Any other directories we leave alone.
1057 */
1058 void
1059 remove_mountpoint(zfs_handle_t *zhp)
1060 {
1061 char mountpoint[ZFS_MAXPROPLEN];
1062 zprop_source_t source;
1063
1064 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
1065 &source))
1066 return;
1067
1068 if (source == ZPROP_SRC_DEFAULT ||
1069 source == ZPROP_SRC_INHERITED) {
1070 /*
1071 * Try to remove the directory, silently ignoring any errors.
1072 * The filesystem may have since been removed or moved around,
1073 * and this error isn't really useful to the administrator in
1074 * any way.
1075 */
1076 (void) rmdir(mountpoint);
1077 }
1078 }
1079
1080 void
1081 libzfs_add_handle(get_all_cb_t *cbp, zfs_handle_t *zhp)
1082 {
1083 if (cbp->cb_alloc == cbp->cb_used) {
1084 size_t newsz;
1085 void *ptr;
1086
1087 newsz = cbp->cb_alloc ? cbp->cb_alloc * 2 : 64;
1088 ptr = zfs_realloc(zhp->zfs_hdl,
1089 cbp->cb_handles, cbp->cb_alloc * sizeof (void *),
1090 newsz * sizeof (void *));
1091 cbp->cb_handles = ptr;
1092 cbp->cb_alloc = newsz;
1093 }
1094 cbp->cb_handles[cbp->cb_used++] = zhp;
1095 }
1096
1097 static int
1098 mount_cb(zfs_handle_t *zhp, void *data)
1099 {
1100 get_all_cb_t *cbp = data;
1101
1102 if (!(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM)) {
1103 zfs_close(zhp);
1104 return (0);
1105 }
1106
1107 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
1108 zfs_close(zhp);
1109 return (0);
1110 }
1111
1112 /*
1113 * If this filesystem is inconsistent and has a receive resume
1114 * token, we can not mount it.
1115 */
1116 if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) &&
1117 zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
1118 NULL, 0, NULL, NULL, 0, B_TRUE) == 0) {
1119 zfs_close(zhp);
1120 return (0);
1121 }
1122
1123 libzfs_add_handle(cbp, zhp);
1124 if (zfs_iter_filesystems(zhp, mount_cb, cbp) != 0) {
1125 zfs_close(zhp);
1126 return (-1);
1127 }
1128 return (0);
1129 }
1130
1131 int
1132 libzfs_dataset_cmp(const void *a, const void *b)
1133 {
1134 zfs_handle_t **za = (zfs_handle_t **)a;
1135 zfs_handle_t **zb = (zfs_handle_t **)b;
1136 char mounta[MAXPATHLEN];
1137 char mountb[MAXPATHLEN];
1138 boolean_t gota, gotb;
1139
1140 if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
1141 verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
1142 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
1143 if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
1144 verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
1145 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
1146
1147 if (gota && gotb)
1148 return (strcmp(mounta, mountb));
1149
1150 if (gota)
1151 return (-1);
1152 if (gotb)
1153 return (1);
1154
1155 return (strcmp(zfs_get_name(a), zfs_get_name(b)));
1156 }
1157
1158 /*
1159 * Mount and share all datasets within the given pool. This assumes that no
1160 * datasets within the pool are currently mounted. Because users can create
1161 * complicated nested hierarchies of mountpoints, we first gather all the
1162 * datasets and mountpoints within the pool, and sort them by mountpoint. Once
1163 * we have the list of all filesystems, we iterate over them in order and mount
1164 * and/or share each one.
1165 */
1166 #pragma weak zpool_mount_datasets = zpool_enable_datasets
1167 int
1168 zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
1169 {
1170 get_all_cb_t cb = { 0 };
1171 libzfs_handle_t *hdl = zhp->zpool_hdl;
1172 zfs_handle_t *zfsp;
1173 int i, ret = -1;
1174 int *good;
1175
1176 /*
1177 * Gather all non-snap datasets within the pool.
1178 */
1179 if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_DATASET)) == NULL)
1180 goto out;
1181
1182 libzfs_add_handle(&cb, zfsp);
1183 if (zfs_iter_filesystems(zfsp, mount_cb, &cb) != 0)
1184 goto out;
1185 /*
1186 * Sort the datasets by mountpoint.
1187 */
1188 qsort(cb.cb_handles, cb.cb_used, sizeof (void *),
1189 libzfs_dataset_cmp);
1190
1191 /*
1192 * And mount all the datasets, keeping track of which ones
1193 * succeeded or failed.
1194 */
1195 if ((good = zfs_alloc(zhp->zpool_hdl,
1196 cb.cb_used * sizeof (int))) == NULL)
1197 goto out;
1198
1199 ret = 0;
1200 for (i = 0; i < cb.cb_used; i++) {
1201 if (zfs_mount(cb.cb_handles[i], mntopts, flags) != 0)
1202 ret = -1;
1203 else
1204 good[i] = 1;
1205 }
1206
1207 /*
1208 * Then share all the ones that need to be shared. This needs
1209 * to be a separate pass in order to avoid excessive reloading
1210 * of the configuration. Good should never be NULL since
1211 * zfs_alloc is supposed to exit if memory isn't available.
1212 */
1213 for (i = 0; i < cb.cb_used; i++) {
1214 if (good[i] && zfs_share(cb.cb_handles[i]) != 0)
1215 ret = -1;
1216 }
1217
1218 free(good);
1219
1220 out:
1221 for (i = 0; i < cb.cb_used; i++)
1222 zfs_close(cb.cb_handles[i]);
1223 free(cb.cb_handles);
1224
1225 return (ret);
1226 }
1227
1228 static int
1229 mountpoint_compare(const void *a, const void *b)
1230 {
1231 const char *mounta = *((char **)a);
1232 const char *mountb = *((char **)b);
1233
1234 return (strcmp(mountb, mounta));
1235 }
1236
1237 /* alias for 2002/240 */
1238 #pragma weak zpool_unmount_datasets = zpool_disable_datasets
1239 /*
1240 * Unshare and unmount all datasets within the given pool. We don't want to
1241 * rely on traversing the DSL to discover the filesystems within the pool,
1242 * because this may be expensive (if not all of them are mounted), and can fail
1243 * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
1244 * gather all the filesystems that are currently mounted.
1245 */
1246 int
1247 zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
1248 {
1249 int used, alloc;
1250 struct mnttab entry;
1251 size_t namelen;
1252 char **mountpoints = NULL;
1253 zfs_handle_t **datasets = NULL;
1254 libzfs_handle_t *hdl = zhp->zpool_hdl;
1255 int i;
1256 int ret = -1;
1257 int flags = (force ? MS_FORCE : 0);
1258 sa_init_selective_arg_t sharearg;
1259
1260 namelen = strlen(zhp->zpool_name);
1261
1262 rewind(hdl->libzfs_mnttab);
1263 used = alloc = 0;
1264 while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
1265 /*
1266 * Ignore non-ZFS entries.
1267 */
1268 if (entry.mnt_fstype == NULL ||
1269 strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
1270 continue;
1271
1272 /*
1273 * Ignore filesystems not within this pool.
1274 */
1275 if (entry.mnt_mountp == NULL ||
1276 strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 ||
1277 (entry.mnt_special[namelen] != '/' &&
1278 entry.mnt_special[namelen] != '\0'))
1279 continue;
1280
1281 /*
1282 * At this point we've found a filesystem within our pool. Add
1283 * it to our growing list.
1284 */
1285 if (used == alloc) {
1286 if (alloc == 0) {
1287 if ((mountpoints = zfs_alloc(hdl,
1288 8 * sizeof (void *))) == NULL)
1289 goto out;
1290
1291 if ((datasets = zfs_alloc(hdl,
1292 8 * sizeof (void *))) == NULL)
1293 goto out;
1294
1295 alloc = 8;
1296 } else {
1297 void *ptr;
1298
1299 if ((ptr = zfs_realloc(hdl, mountpoints,
1300 alloc * sizeof (void *),
1301 alloc * 2 * sizeof (void *))) == NULL)
1302 goto out;
1303 mountpoints = ptr;
1304
1305 if ((ptr = zfs_realloc(hdl, datasets,
1306 alloc * sizeof (void *),
1307 alloc * 2 * sizeof (void *))) == NULL)
1308 goto out;
1309 datasets = ptr;
1310
1311 alloc *= 2;
1312 }
1313 }
1314
1315 if ((mountpoints[used] = zfs_strdup(hdl,
1316 entry.mnt_mountp)) == NULL)
1317 goto out;
1318
1319 /*
1320 * This is allowed to fail, in case there is some I/O error. It
1321 * is only used to determine if we need to remove the underlying
1322 * mountpoint, so failure is not fatal.
1323 */
1324 datasets[used] = make_dataset_handle(hdl, entry.mnt_special);
1325
1326 used++;
1327 }
1328
1329 /*
1330 * At this point, we have the entire list of filesystems, so sort it by
1331 * mountpoint.
1332 */
1333 sharearg.zhandle_arr = datasets;
1334 sharearg.zhandle_len = used;
1335 ret = zfs_init_libshare_arg(hdl, SA_INIT_SHARE_API_SELECTIVE,
1336 &sharearg);
1337 if (ret != 0)
1338 goto out;
1339 qsort(mountpoints, used, sizeof (char *), mountpoint_compare);
1340
1341 /*
1342 * Walk through and first unshare everything.
1343 */
1344 for (i = 0; i < used; i++) {
1345 zfs_share_proto_t *curr_proto;
1346 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
1347 curr_proto++) {
1348 if (is_shared(hdl, mountpoints[i], *curr_proto) &&
1349 unshare_one(hdl, mountpoints[i],
1350 mountpoints[i], *curr_proto) != 0)
1351 goto out;
1352 }
1353 }
1354
1355 /*
1356 * Now unmount everything, removing the underlying directories as
1357 * appropriate.
1358 */
1359 for (i = 0; i < used; i++) {
1360 if (unmount_one(hdl, mountpoints[i], flags) != 0)
1361 goto out;
1362 }
1363
1364 for (i = 0; i < used; i++) {
1365 if (datasets[i])
1366 remove_mountpoint(datasets[i]);
1367 }
1368
1369 ret = 0;
1370 out:
1371 for (i = 0; i < used; i++) {
1372 if (datasets[i])
1373 zfs_close(datasets[i]);
1374 free(mountpoints[i]);
1375 }
1376 free(datasets);
1377 free(mountpoints);
1378
1379 return (ret);
1380 }