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