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.
27 * Routines to manage ZFS mounts. We separate all the nasty routines that have
28 * to deal with the OS. The following functions are the main entry points --
29 * they are used by mount and unmount and when changing a filesystem's
37 * This file also contains the functions used to manage sharing filesystems via
50 * zfs_unshareall_nfs()
51 * zfs_unshareall_smb()
53 * zfs_unshareall_bypath()
55 * The following functions are available for pool consumers, and will
56 * mount/unmount and share/unshare all datasets within pool:
58 * zpool_enable_datasets()
59 * zpool_disable_datasets()
72 #include <sys/mntent.h>
73 #include <sys/mount.h>
78 #include "libzfs_impl.h"
81 #include <sys/systeminfo.h>
82 #define MAXISALEN 257 /* based on sysinfo(2) man page */
84 static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
85 zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
89 * The share protocols table must be in the same order as the zfs_share_prot_t
90 * enum in libzfs_impl.h
99 proto_table_t proto_table[PROTO_END] = {
100 {ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
101 {ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
104 zfs_share_proto_t nfs_only[] = {
109 zfs_share_proto_t smb_only[] = {
113 zfs_share_proto_t share_all_proto[] = {
120 * Search the sharetab for the given mountpoint and protocol, returning
121 * a zfs_share_type_t value.
123 static zfs_share_type_t
124 is_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto)
126 char buf[MAXPATHLEN], *tab;
129 if (hdl->libzfs_sharetab == NULL)
130 return (SHARED_NOT_SHARED);
132 (void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
134 while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
136 /* the mountpoint is the first entry on each line */
137 if ((tab = strchr(buf, '\t')) == NULL)
141 if (strcmp(buf, mountpoint) == 0) {
143 * the protocol field is the third field
144 * skip over second field
147 if ((tab = strchr(ptr, '\t')) == NULL)
150 if ((tab = strchr(ptr, '\t')) == NULL)
154 proto_table[proto].p_name) == 0) {
167 return (SHARED_NOT_SHARED);
171 * Returns true if the specified directory is empty. If we can't open the
172 * directory at all, return true so that the mount can fail with a more
173 * informative error message.
176 dir_is_empty(const char *dirname)
181 if ((dirp = opendir(dirname)) == NULL)
184 while ((dp = readdir64(dirp)) != NULL) {
186 if (strcmp(dp->d_name, ".") == 0 ||
187 strcmp(dp->d_name, "..") == 0)
190 (void) closedir(dirp);
194 (void) closedir(dirp);
199 * Checks to see if the mount is active. If the filesystem is mounted, we fill
200 * in 'where' with the current mountpoint, and return 1. Otherwise, we return
204 is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
208 if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0)
212 *where = zfs_strdup(zfs_hdl, entry.mnt_mountp);
218 zfs_is_mounted(zfs_handle_t *zhp, char **where)
220 return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where));
224 * Returns true if the given dataset is mountable, false otherwise. Returns the
225 * mountpoint in 'buf'.
228 zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
229 zprop_source_t *source)
231 char sourceloc[ZFS_MAXNAMELEN];
232 zprop_source_t sourcetype;
234 if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
237 verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
238 &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);
240 if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 ||
241 strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0)
244 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF)
247 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
248 getzoneid() == GLOBAL_ZONEID)
252 *source = sourcetype;
258 * Mount the given filesystem.
261 zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
264 char mountpoint[ZFS_MAXPROPLEN];
265 char mntopts[MNT_LINE_MAX];
266 libzfs_handle_t *hdl = zhp->zfs_hdl;
271 (void) strlcpy(mntopts, options, sizeof (mntopts));
273 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
276 /* Create the directory if it doesn't already exist */
277 if (lstat(mountpoint, &buf) != 0) {
278 if (mkdirp(mountpoint, 0755) != 0) {
279 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
280 "failed to create mountpoint"));
281 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
282 dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
288 * Determine if the mountpoint is empty. If so, refuse to perform the
289 * mount. We don't perform this check if MS_OVERLAY is specified, which
290 * would defeat the point. We also avoid this check if 'remount' is
293 if ((flags & MS_OVERLAY) == 0 &&
294 strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
295 !dir_is_empty(mountpoint)) {
296 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
297 "directory is not empty"));
298 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
299 dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
302 /* perform the mount */
303 if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
304 MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
306 * Generic errors are nasty, but there are just way too many
307 * from mount(), and they're well-understood. We pick a few
308 * common ones to improve upon.
310 if (errno == EBUSY) {
311 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
312 "mountpoint or dataset is busy"));
313 } else if (errno == EPERM) {
314 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
315 "Insufficient privileges"));
316 } else if (errno == ENOTSUP) {
320 VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
321 (void) snprintf(buf, sizeof (buf),
322 dgettext(TEXT_DOMAIN, "Can't mount a version %lld "
323 "file system on a version %d pool. Pool must be"
324 " upgraded to mount this file system."),
325 (u_longlong_t)zfs_prop_get_int(zhp,
326 ZFS_PROP_VERSION), spa_version);
327 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
329 zfs_error_aux(hdl, strerror(errno));
331 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
332 dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
336 /* add the mounted entry into our cache */
337 libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint,
343 * Unmount a single filesystem.
346 unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
348 if (umount2(mountpoint, flags) != 0) {
349 zfs_error_aux(hdl, strerror(errno));
350 return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
351 dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
359 * Unmount the given filesystem.
362 zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
364 libzfs_handle_t *hdl = zhp->zfs_hdl;
368 /* check to see if we need to unmount the filesystem */
369 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
370 libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) {
372 * mountpoint may have come from a call to
373 * getmnt/getmntany if it isn't NULL. If it is NULL,
374 * we know it comes from libzfs_mnttab_find which can
375 * then get freed later. We strdup it to play it safe.
377 if (mountpoint == NULL)
378 mntpt = zfs_strdup(hdl, entry.mnt_mountp);
380 mntpt = zfs_strdup(hdl, mountpoint);
383 * Unshare and unmount the filesystem
385 if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0)
388 if (unmount_one(hdl, mntpt, flags) != 0) {
390 (void) zfs_shareall(zhp);
393 libzfs_mnttab_remove(hdl, zhp->zfs_name);
401 * Unmount this filesystem and any children inheriting the mountpoint property.
402 * To do this, just act like we're changing the mountpoint property, but don't
403 * remount the filesystems afterwards.
406 zfs_unmountall(zfs_handle_t *zhp, int flags)
408 prop_changelist_t *clp;
411 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 0, flags);
415 ret = changelist_prefix(clp);
416 changelist_free(clp);
422 zfs_is_shared(zfs_handle_t *zhp)
424 zfs_share_type_t rc = 0;
425 zfs_share_proto_t *curr_proto;
427 if (ZFS_IS_VOLUME(zhp))
430 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
432 rc |= zfs_is_shared_proto(zhp, NULL, *curr_proto);
434 return (rc ? B_TRUE : B_FALSE);
438 zfs_share(zfs_handle_t *zhp)
440 if (ZFS_IS_VOLUME(zhp))
443 return (zfs_share_proto(zhp, share_all_proto));
447 zfs_unshare(zfs_handle_t *zhp)
449 if (ZFS_IS_VOLUME(zhp))
452 return (zfs_unshareall(zhp));
456 * Check to see if the filesystem is currently shared.
459 zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto)
464 if (!zfs_is_mounted(zhp, &mountpoint))
465 return (SHARED_NOT_SHARED);
467 if (rc = is_shared(zhp->zfs_hdl, mountpoint, proto)) {
475 return (SHARED_NOT_SHARED);
480 zfs_is_shared_nfs(zfs_handle_t *zhp, char **where)
482 return (zfs_is_shared_proto(zhp, where,
483 PROTO_NFS) != SHARED_NOT_SHARED);
487 zfs_is_shared_smb(zfs_handle_t *zhp, char **where)
489 return (zfs_is_shared_proto(zhp, where,
490 PROTO_SMB) != SHARED_NOT_SHARED);
494 * Make sure things will work if libshare isn't installed by using
495 * wrapper functions that check to see that the pointers to functions
496 * initialized in _zfs_init_libshare() are actually present.
499 static sa_handle_t (*_sa_init)(int);
500 static void (*_sa_fini)(sa_handle_t);
501 static sa_share_t (*_sa_find_share)(sa_handle_t, char *);
502 static int (*_sa_enable_share)(sa_share_t, char *);
503 static int (*_sa_disable_share)(sa_share_t, char *);
504 static char *(*_sa_errorstr)(int);
505 static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *);
506 static boolean_t (*_sa_needs_refresh)(sa_handle_t *);
507 static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t);
508 static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t,
509 char *, char *, zprop_source_t, char *, char *, char *);
510 static void (*_sa_update_sharetab_ts)(sa_handle_t);
513 * _zfs_init_libshare()
515 * Find the libshare.so.1 entry points that we use here and save the
516 * values to be used later. This is triggered by the runtime loader.
517 * Make sure the correct ISA version is loaded.
520 #pragma init(_zfs_init_libshare)
522 _zfs_init_libshare(void)
525 char path[MAXPATHLEN];
529 if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1)
534 (void) snprintf(path, MAXPATHLEN,
535 "/usr/lib/%s/libshare.so.1", isa);
537 if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) {
538 _sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init");
539 _sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini");
540 _sa_find_share = (sa_share_t (*)(sa_handle_t, char *))
541 dlsym(libshare, "sa_find_share");
542 _sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
544 _sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
546 _sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr");
547 _sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *))
548 dlsym(libshare, "sa_parse_legacy_options");
549 _sa_needs_refresh = (boolean_t (*)(sa_handle_t *))
550 dlsym(libshare, "sa_needs_refresh");
551 _sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t))
552 dlsym(libshare, "sa_get_zfs_handle");
553 _sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t,
554 sa_share_t, char *, char *, zprop_source_t, char *,
555 char *, char *))dlsym(libshare, "sa_zfs_process_share");
556 _sa_update_sharetab_ts = (void (*)(sa_handle_t))
557 dlsym(libshare, "sa_update_sharetab_ts");
558 if (_sa_init == NULL || _sa_fini == NULL ||
559 _sa_find_share == NULL || _sa_enable_share == NULL ||
560 _sa_disable_share == NULL || _sa_errorstr == NULL ||
561 _sa_parse_legacy_options == NULL ||
562 _sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL ||
563 _sa_zfs_process_share == NULL ||
564 _sa_update_sharetab_ts == NULL) {
567 _sa_disable_share = NULL;
568 _sa_enable_share = NULL;
570 _sa_parse_legacy_options = NULL;
571 (void) dlclose(libshare);
572 _sa_needs_refresh = NULL;
573 _sa_get_zfs_handle = NULL;
574 _sa_zfs_process_share = NULL;
575 _sa_update_sharetab_ts = NULL;
581 * zfs_init_libshare(zhandle, service)
583 * Initialize the libshare API if it hasn't already been initialized.
584 * In all cases it returns 0 if it succeeded and an error if not. The
585 * service value is which part(s) of the API to initialize and is a
586 * direct map to the libshare sa_init(service) interface.
589 zfs_init_libshare(libzfs_handle_t *zhandle, int service)
593 if (_sa_init == NULL)
596 if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
598 * We had a cache miss. Most likely it is a new ZFS
599 * dataset that was just created. We want to make sure
600 * so check timestamps to see if a different process
601 * has updated any of the configuration. If there was
602 * some non-ZFS change, we need to re-initialize the
605 zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
606 if (_sa_needs_refresh != NULL &&
607 _sa_needs_refresh(zhandle->libzfs_sharehdl)) {
608 zfs_uninit_libshare(zhandle);
609 zhandle->libzfs_sharehdl = _sa_init(service);
613 if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
614 zhandle->libzfs_sharehdl = _sa_init(service);
616 if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
623 * zfs_uninit_libshare(zhandle)
625 * Uninitialize the libshare API if it hasn't already been
626 * uninitialized. It is OK to call multiple times.
629 zfs_uninit_libshare(libzfs_handle_t *zhandle)
631 if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) {
632 if (_sa_fini != NULL)
633 _sa_fini(zhandle->libzfs_sharehdl);
634 zhandle->libzfs_sharehdl = NULL;
639 * zfs_parse_options(options, proto)
641 * Call the legacy parse interface to get the protocol specific
642 * options using the NULL arg to indicate that this is a "parse" only.
645 zfs_parse_options(char *options, zfs_share_proto_t proto)
647 if (_sa_parse_legacy_options != NULL) {
648 return (_sa_parse_legacy_options(NULL, options,
649 proto_table[proto].p_name));
651 return (SA_CONFIG_ERR);
655 * zfs_sa_find_share(handle, path)
657 * wrapper around sa_find_share to find a share path in the
661 zfs_sa_find_share(sa_handle_t handle, char *path)
663 if (_sa_find_share != NULL)
664 return (_sa_find_share(handle, path));
669 * zfs_sa_enable_share(share, proto)
671 * Wrapper for sa_enable_share which enables a share for a specified
675 zfs_sa_enable_share(sa_share_t share, char *proto)
677 if (_sa_enable_share != NULL)
678 return (_sa_enable_share(share, proto));
679 return (SA_CONFIG_ERR);
683 * zfs_sa_disable_share(share, proto)
685 * Wrapper for sa_enable_share which disables a share for a specified
689 zfs_sa_disable_share(sa_share_t share, char *proto)
691 if (_sa_disable_share != NULL)
692 return (_sa_disable_share(share, proto));
693 return (SA_CONFIG_ERR);
697 * Share the given filesystem according to the options in the specified
698 * protocol specific properties (sharenfs, sharesmb). We rely
699 * on "libshare" to the dirty work for us.
702 zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
704 char mountpoint[ZFS_MAXPROPLEN];
705 char shareopts[ZFS_MAXPROPLEN];
706 char sourcestr[ZFS_MAXPROPLEN];
707 libzfs_handle_t *hdl = zhp->zfs_hdl;
709 zfs_share_proto_t *curr_proto;
710 zprop_source_t sourcetype;
713 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
716 if ((ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
717 (void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
718 dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
719 zfs_get_name(zhp), _sa_errorstr != NULL ?
720 _sa_errorstr(ret) : "");
724 for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
726 * Return success if there are no share options.
728 if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
729 shareopts, sizeof (shareopts), &sourcetype, sourcestr,
730 ZFS_MAXPROPLEN, B_FALSE) != 0 ||
731 strcmp(shareopts, "off") == 0)
735 * If the 'zoned' property is set, then zfs_is_mountable()
736 * will have already bailed out if we are in the global zone.
737 * But local zones cannot be NFS servers, so we ignore it for
738 * local zones as well.
740 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
743 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint);
746 * This may be a new file system that was just
747 * created so isn't in the internal cache
748 * (second time through). Rather than
749 * reloading the entire configuration, we can
750 * assume ZFS has done the checking and it is
751 * safe to add this to the internal
754 if (_sa_zfs_process_share(hdl->libzfs_sharehdl,
755 NULL, NULL, mountpoint,
756 proto_table[*curr_proto].p_name, sourcetype,
757 shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
758 (void) zfs_error_fmt(hdl,
759 proto_table[*curr_proto].p_share_err,
760 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
764 hdl->libzfs_shareflags |= ZFSSHARE_MISS;
765 share = zfs_sa_find_share(hdl->libzfs_sharehdl,
770 err = zfs_sa_enable_share(share,
771 proto_table[*curr_proto].p_name);
773 (void) zfs_error_fmt(hdl,
774 proto_table[*curr_proto].p_share_err,
775 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
780 (void) zfs_error_fmt(hdl,
781 proto_table[*curr_proto].p_share_err,
782 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
793 zfs_share_nfs(zfs_handle_t *zhp)
795 return (zfs_share_proto(zhp, nfs_only));
799 zfs_share_smb(zfs_handle_t *zhp)
801 return (zfs_share_proto(zhp, smb_only));
805 zfs_shareall(zfs_handle_t *zhp)
807 return (zfs_share_proto(zhp, share_all_proto));
811 * Unshare a filesystem by mountpoint.
814 unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
815 zfs_share_proto_t proto)
821 * Mountpoint could get trashed if libshare calls getmntany
822 * which it does during API initialization, so strdup the
825 mntpt = zfs_strdup(hdl, mountpoint);
827 /* make sure libshare initialized */
828 if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
829 free(mntpt); /* don't need the copy anymore */
830 return (zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
831 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
832 name, _sa_errorstr(err)));
835 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mntpt);
836 free(mntpt); /* don't need the copy anymore */
839 err = zfs_sa_disable_share(share, proto_table[proto].p_name);
841 return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
842 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
843 name, _sa_errorstr(err)));
846 return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
847 dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
854 * Unshare the given filesystem.
857 zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint,
858 zfs_share_proto_t *proto)
860 libzfs_handle_t *hdl = zhp->zfs_hdl;
864 /* check to see if need to unmount the filesystem */
865 rewind(zhp->zfs_hdl->libzfs_mnttab);
866 if (mountpoint != NULL)
867 mountpoint = mntpt = zfs_strdup(hdl, mountpoint);
869 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
870 libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) {
871 zfs_share_proto_t *curr_proto;
873 if (mountpoint == NULL)
874 mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
876 for (curr_proto = proto; *curr_proto != PROTO_END;
879 if (is_shared(hdl, mntpt, *curr_proto) &&
880 unshare_one(hdl, zhp->zfs_name,
881 mntpt, *curr_proto) != 0) {
895 zfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint)
897 return (zfs_unshare_proto(zhp, mountpoint, nfs_only));
901 zfs_unshare_smb(zfs_handle_t *zhp, const char *mountpoint)
903 return (zfs_unshare_proto(zhp, mountpoint, smb_only));
907 * Same as zfs_unmountall(), but for NFS and SMB unshares.
910 zfs_unshareall_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
912 prop_changelist_t *clp;
915 clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0);
919 ret = changelist_unshare(clp, proto);
920 changelist_free(clp);
926 zfs_unshareall_nfs(zfs_handle_t *zhp)
928 return (zfs_unshareall_proto(zhp, nfs_only));
932 zfs_unshareall_smb(zfs_handle_t *zhp)
934 return (zfs_unshareall_proto(zhp, smb_only));
938 zfs_unshareall(zfs_handle_t *zhp)
940 return (zfs_unshareall_proto(zhp, share_all_proto));
944 zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint)
946 return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
950 * Remove the mountpoint associated with the current dataset, if necessary.
951 * We only remove the underlying directory if:
953 * - The mountpoint is not 'none' or 'legacy'
954 * - The mountpoint is non-empty
955 * - The mountpoint is the default or inherited
956 * - The 'zoned' property is set, or we're in a local zone
958 * Any other directories we leave alone.
961 remove_mountpoint(zfs_handle_t *zhp)
963 char mountpoint[ZFS_MAXPROPLEN];
964 zprop_source_t source;
966 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
970 if (source == ZPROP_SRC_DEFAULT ||
971 source == ZPROP_SRC_INHERITED) {
973 * Try to remove the directory, silently ignoring any errors.
974 * The filesystem may have since been removed or moved around,
975 * and this error isn't really useful to the administrator in
978 (void) rmdir(mountpoint);
982 typedef struct mount_cbdata {
983 zfs_handle_t **cb_datasets;
989 mount_cb(zfs_handle_t *zhp, void *data)
991 mount_cbdata_t *cbp = data;
993 if (!(zfs_get_type(zhp) & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME))) {
998 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
1003 if (cbp->cb_alloc == cbp->cb_used) {
1006 if ((ptr = zfs_realloc(zhp->zfs_hdl,
1007 cbp->cb_datasets, cbp->cb_alloc * sizeof (void *),
1008 cbp->cb_alloc * 2 * sizeof (void *))) == NULL)
1010 cbp->cb_datasets = ptr;
1015 cbp->cb_datasets[cbp->cb_used++] = zhp;
1017 return (zfs_iter_filesystems(zhp, mount_cb, cbp));
1021 dataset_cmp(const void *a, const void *b)
1023 zfs_handle_t **za = (zfs_handle_t **)a;
1024 zfs_handle_t **zb = (zfs_handle_t **)b;
1025 char mounta[MAXPATHLEN];
1026 char mountb[MAXPATHLEN];
1027 boolean_t gota, gotb;
1029 if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
1030 verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
1031 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
1032 if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
1033 verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
1034 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
1037 return (strcmp(mounta, mountb));
1044 return (strcmp(zfs_get_name(a), zfs_get_name(b)));
1048 * Mount and share all datasets within the given pool. This assumes that no
1049 * datasets within the pool are currently mounted. Because users can create
1050 * complicated nested hierarchies of mountpoints, we first gather all the
1051 * datasets and mountpoints within the pool, and sort them by mountpoint. Once
1052 * we have the list of all filesystems, we iterate over them in order and mount
1053 * and/or share each one.
1055 #pragma weak zpool_mount_datasets = zpool_enable_datasets
1057 zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
1059 mount_cbdata_t cb = { 0 };
1060 libzfs_handle_t *hdl = zhp->zpool_hdl;
1066 * Gather all non-snap datasets within the pool.
1068 if ((cb.cb_datasets = zfs_alloc(hdl, 4 * sizeof (void *))) == NULL)
1072 if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_DATASET)) == NULL)
1075 cb.cb_datasets[0] = zfsp;
1078 if (zfs_iter_filesystems(zfsp, mount_cb, &cb) != 0)
1082 * Sort the datasets by mountpoint.
1084 qsort(cb.cb_datasets, cb.cb_used, sizeof (void *), dataset_cmp);
1087 * And mount all the datasets, keeping track of which ones
1088 * succeeded or failed.
1090 if ((good = zfs_alloc(zhp->zpool_hdl,
1091 cb.cb_used * sizeof (int))) == NULL)
1095 for (i = 0; i < cb.cb_used; i++) {
1096 if (zfs_mount(cb.cb_datasets[i], mntopts, flags) != 0)
1103 * Then share all the ones that need to be shared. This needs
1104 * to be a separate pass in order to avoid excessive reloading
1105 * of the configuration. Good should never be NULL since
1106 * zfs_alloc is supposed to exit if memory isn't available.
1108 for (i = 0; i < cb.cb_used; i++) {
1109 if (good[i] && zfs_share(cb.cb_datasets[i]) != 0)
1116 for (i = 0; i < cb.cb_used; i++)
1117 zfs_close(cb.cb_datasets[i]);
1118 free(cb.cb_datasets);
1124 mountpoint_compare(const void *a, const void *b)
1126 const char *mounta = *((char **)a);
1127 const char *mountb = *((char **)b);
1129 return (strcmp(mountb, mounta));
1132 /* alias for 2002/240 */
1133 #pragma weak zpool_unmount_datasets = zpool_disable_datasets
1135 * Unshare and unmount all datasets within the given pool. We don't want to
1136 * rely on traversing the DSL to discover the filesystems within the pool,
1137 * because this may be expensive (if not all of them are mounted), and can fail
1138 * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
1139 * gather all the filesystems that are currently mounted.
1142 zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
1145 struct mnttab entry;
1147 char **mountpoints = NULL;
1148 zfs_handle_t **datasets = NULL;
1149 libzfs_handle_t *hdl = zhp->zpool_hdl;
1152 int flags = (force ? MS_FORCE : 0);
1154 namelen = strlen(zhp->zpool_name);
1156 rewind(hdl->libzfs_mnttab);
1158 while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
1160 * Ignore non-ZFS entries.
1162 if (entry.mnt_fstype == NULL ||
1163 strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
1167 * Ignore filesystems not within this pool.
1169 if (entry.mnt_mountp == NULL ||
1170 strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 ||
1171 (entry.mnt_special[namelen] != '/' &&
1172 entry.mnt_special[namelen] != '\0'))
1176 * At this point we've found a filesystem within our pool. Add
1177 * it to our growing list.
1179 if (used == alloc) {
1181 if ((mountpoints = zfs_alloc(hdl,
1182 8 * sizeof (void *))) == NULL)
1185 if ((datasets = zfs_alloc(hdl,
1186 8 * sizeof (void *))) == NULL)
1193 if ((ptr = zfs_realloc(hdl, mountpoints,
1194 alloc * sizeof (void *),
1195 alloc * 2 * sizeof (void *))) == NULL)
1199 if ((ptr = zfs_realloc(hdl, datasets,
1200 alloc * sizeof (void *),
1201 alloc * 2 * sizeof (void *))) == NULL)
1209 if ((mountpoints[used] = zfs_strdup(hdl,
1210 entry.mnt_mountp)) == NULL)
1214 * This is allowed to fail, in case there is some I/O error. It
1215 * is only used to determine if we need to remove the underlying
1216 * mountpoint, so failure is not fatal.
1218 datasets[used] = make_dataset_handle(hdl, entry.mnt_special);
1224 * At this point, we have the entire list of filesystems, so sort it by
1227 qsort(mountpoints, used, sizeof (char *), mountpoint_compare);
1230 * Walk through and first unshare everything.
1232 for (i = 0; i < used; i++) {
1233 zfs_share_proto_t *curr_proto;
1234 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
1236 if (is_shared(hdl, mountpoints[i], *curr_proto) &&
1237 unshare_one(hdl, mountpoints[i],
1238 mountpoints[i], *curr_proto) != 0)
1244 * Now unmount everything, removing the underlying directories as
1247 for (i = 0; i < used; i++) {
1248 if (unmount_one(hdl, mountpoints[i], flags) != 0)
1252 for (i = 0; i < used; i++) {
1254 remove_mountpoint(datasets[i]);
1259 for (i = 0; i < used; i++) {
1261 zfs_close(datasets[i]);
1262 free(mountpoints[i]);