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>
75 #ifdef HAVE_LIBSELINUX
76 #include <selinux/selinux.h>
77 #endif /* HAVE_LIBSELINUX */
81 #include "libzfs_impl.h"
84 #include <sys/systeminfo.h>
85 #define MAXISALEN 257 /* based on sysinfo(2) man page */
88 static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
89 zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
93 * The share protocols table must be in the same order as the zfs_share_prot_t
94 * enum in libzfs_impl.h
103 proto_table_t proto_table[PROTO_END] = {
104 {ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
105 {ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
108 zfs_share_proto_t nfs_only[] = {
113 zfs_share_proto_t smb_only[] = {
117 zfs_share_proto_t share_all_proto[] = {
124 * Search the sharetab for the given mountpoint and protocol, returning
125 * a zfs_share_type_t value.
127 static zfs_share_type_t
128 is_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto)
130 char buf[MAXPATHLEN], *tab;
133 if (hdl->libzfs_sharetab == NULL)
134 return (SHARED_NOT_SHARED);
136 (void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
138 while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
140 /* the mountpoint is the first entry on each line */
141 if ((tab = strchr(buf, '\t')) == NULL)
145 if (strcmp(buf, mountpoint) == 0) {
147 * the protocol field is the third field
148 * skip over second field
151 if ((tab = strchr(ptr, '\t')) == NULL)
154 if ((tab = strchr(ptr, '\t')) == NULL)
158 proto_table[proto].p_name) == 0) {
171 return (SHARED_NOT_SHARED);
175 * Returns true if the specified directory is empty. If we can't open the
176 * directory at all, return true so that the mount can fail with a more
177 * informative error message.
180 dir_is_empty(const char *dirname)
185 if ((dirp = opendir(dirname)) == NULL)
188 while ((dp = readdir64(dirp)) != NULL) {
190 if (strcmp(dp->d_name, ".") == 0 ||
191 strcmp(dp->d_name, "..") == 0)
194 (void) closedir(dirp);
198 (void) closedir(dirp);
203 * Checks to see if the mount is active. If the filesystem is mounted, we fill
204 * in 'where' with the current mountpoint, and return 1. Otherwise, we return
208 is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
212 if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0)
216 *where = zfs_strdup(zfs_hdl, entry.mnt_mountp);
222 zfs_is_mounted(zfs_handle_t *zhp, char **where)
224 return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where));
228 * Returns true if the given dataset is mountable, false otherwise. Returns the
229 * mountpoint in 'buf'.
232 zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
233 zprop_source_t *source)
235 char sourceloc[ZFS_MAXNAMELEN];
236 zprop_source_t sourcetype;
238 if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
241 verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
242 &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);
244 if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 ||
245 strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0)
248 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF)
251 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
252 getzoneid() == GLOBAL_ZONEID)
256 *source = sourcetype;
262 * Mount the given filesystem.
265 zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
268 char mountpoint[ZFS_MAXPROPLEN];
269 char mntopts[MNT_LINE_MAX];
270 libzfs_handle_t *hdl = zhp->zfs_hdl;
275 (void) strlcpy(mntopts, options, sizeof (mntopts));
278 * If the pool is imported read-only then all mounts must be read-only
280 if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
283 #ifdef HAVE_LIBSELINUX
284 if (is_selinux_enabled())
285 (void) strlcat(mntopts, ",context=\"system_u:"
286 "object_r:file_t:s0\"", sizeof (mntopts));
287 #endif /* HAVE_LIBSELINUX */
289 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
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'"),
304 * Determine if the mountpoint is empty. If so, refuse to perform the
305 * mount. We don't perform this check if MS_OVERLAY is specified, which
306 * would defeat the point. We also avoid this check if 'remount' is
309 if ((flags & MS_OVERLAY) == 0 &&
310 strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
311 !dir_is_empty(mountpoint)) {
312 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
313 "directory is not empty"));
314 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
315 dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
318 /* perform the mount */
319 if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
320 MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
322 * Generic errors are nasty, but there are just way too many
323 * from mount(), and they're well-understood. We pick a few
324 * common ones to improve upon.
326 if (errno == EBUSY) {
327 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
328 "mountpoint or dataset is busy"));
329 } else if (errno == EPERM) {
330 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
331 "Insufficient privileges"));
332 } else if (errno == ENOTSUP) {
336 VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
337 (void) snprintf(buf, sizeof (buf),
338 dgettext(TEXT_DOMAIN, "Can't mount a version %lld "
339 "file system on a version %d pool. Pool must be"
340 " upgraded to mount this file system."),
341 (u_longlong_t)zfs_prop_get_int(zhp,
342 ZFS_PROP_VERSION), spa_version);
343 zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
345 zfs_error_aux(hdl, strerror(errno));
347 return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
348 dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
352 /* add the mounted entry into our cache */
353 libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint,
359 * Unmount a single filesystem.
362 unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
364 if (umount2(mountpoint, flags) != 0) {
365 zfs_error_aux(hdl, strerror(errno));
366 return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
367 dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
375 * Unmount the given filesystem.
378 zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
380 libzfs_handle_t *hdl = zhp->zfs_hdl;
384 /* check to see if we need to unmount the filesystem */
385 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
386 libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) {
388 * mountpoint may have come from a call to
389 * getmnt/getmntany if it isn't NULL. If it is NULL,
390 * we know it comes from libzfs_mnttab_find which can
391 * then get freed later. We strdup it to play it safe.
393 if (mountpoint == NULL)
394 mntpt = zfs_strdup(hdl, entry.mnt_mountp);
396 mntpt = zfs_strdup(hdl, mountpoint);
399 * Unshare and unmount the filesystem
401 if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0)
404 if (unmount_one(hdl, mntpt, flags) != 0) {
406 (void) zfs_shareall(zhp);
409 libzfs_mnttab_remove(hdl, zhp->zfs_name);
417 * Unmount this filesystem and any children inheriting the mountpoint property.
418 * To do this, just act like we're changing the mountpoint property, but don't
419 * remount the filesystems afterwards.
422 zfs_unmountall(zfs_handle_t *zhp, int flags)
424 prop_changelist_t *clp;
427 clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 0, flags);
431 ret = changelist_prefix(clp);
432 changelist_free(clp);
438 zfs_is_shared(zfs_handle_t *zhp)
440 zfs_share_type_t rc = 0;
441 zfs_share_proto_t *curr_proto;
443 if (ZFS_IS_VOLUME(zhp))
446 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
448 rc |= zfs_is_shared_proto(zhp, NULL, *curr_proto);
450 return (rc ? B_TRUE : B_FALSE);
454 zfs_share(zfs_handle_t *zhp)
456 assert(!ZFS_IS_VOLUME(zhp));
457 return (zfs_share_proto(zhp, share_all_proto));
461 zfs_unshare(zfs_handle_t *zhp)
463 assert(!ZFS_IS_VOLUME(zhp));
464 return (zfs_unshareall(zhp));
468 * Check to see if the filesystem is currently shared.
471 zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto)
476 if (!zfs_is_mounted(zhp, &mountpoint))
477 return (SHARED_NOT_SHARED);
479 if ((rc = is_shared(zhp->zfs_hdl, mountpoint, proto))) {
487 return (SHARED_NOT_SHARED);
492 zfs_is_shared_nfs(zfs_handle_t *zhp, char **where)
494 return (zfs_is_shared_proto(zhp, where,
495 PROTO_NFS) != SHARED_NOT_SHARED);
499 zfs_is_shared_smb(zfs_handle_t *zhp, char **where)
501 return (zfs_is_shared_proto(zhp, where,
502 PROTO_SMB) != SHARED_NOT_SHARED);
506 * Make sure things will work if libshare isn't installed by using
507 * wrapper functions that check to see that the pointers to functions
508 * initialized in _zfs_init_libshare() are actually present.
511 static sa_handle_t (*_sa_init)(int);
512 static void (*_sa_fini)(sa_handle_t);
513 static sa_share_t (*_sa_find_share)(sa_handle_t, char *);
514 static int (*_sa_enable_share)(sa_share_t, char *);
515 static int (*_sa_disable_share)(sa_share_t, char *);
516 static char *(*_sa_errorstr)(int);
517 static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *);
518 static boolean_t (*_sa_needs_refresh)(sa_handle_t *);
519 static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t);
520 static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t,
521 char *, char *, zprop_source_t, char *, char *, char *);
522 static void (*_sa_update_sharetab_ts)(sa_handle_t);
525 * _zfs_init_libshare()
527 * Find the libshare.so.1 entry points that we use here and save the
528 * values to be used later. This is triggered by the runtime loader.
529 * Make sure the correct ISA version is loaded.
533 _zfs_init_libshare(void) __attribute__((constructor));
535 #pragma init(_zfs_init_libshare)
538 _zfs_init_libshare(void)
541 char path[MAXPATHLEN];
545 if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1)
550 (void) snprintf(path, MAXPATHLEN,
551 "/usr/lib/%s/libshare.so.1", isa);
553 if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) {
554 _sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init");
555 _sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini");
556 _sa_find_share = (sa_share_t (*)(sa_handle_t, char *))
557 dlsym(libshare, "sa_find_share");
558 _sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
560 _sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
562 _sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr");
563 _sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *))
564 dlsym(libshare, "sa_parse_legacy_options");
565 _sa_needs_refresh = (boolean_t (*)(sa_handle_t *))
566 dlsym(libshare, "sa_needs_refresh");
567 _sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t))
568 dlsym(libshare, "sa_get_zfs_handle");
569 _sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t,
570 sa_share_t, char *, char *, zprop_source_t, char *,
571 char *, char *))dlsym(libshare, "sa_zfs_process_share");
572 _sa_update_sharetab_ts = (void (*)(sa_handle_t))
573 dlsym(libshare, "sa_update_sharetab_ts");
574 if (_sa_init == NULL || _sa_fini == NULL ||
575 _sa_find_share == NULL || _sa_enable_share == NULL ||
576 _sa_disable_share == NULL || _sa_errorstr == NULL ||
577 _sa_parse_legacy_options == NULL ||
578 _sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL ||
579 _sa_zfs_process_share == NULL ||
580 _sa_update_sharetab_ts == NULL) {
583 _sa_disable_share = NULL;
584 _sa_enable_share = NULL;
586 _sa_parse_legacy_options = NULL;
587 (void) dlclose(libshare);
588 _sa_needs_refresh = NULL;
589 _sa_get_zfs_handle = NULL;
590 _sa_zfs_process_share = NULL;
591 _sa_update_sharetab_ts = NULL;
597 * zfs_init_libshare(zhandle, service)
599 * Initialize the libshare API if it hasn't already been initialized.
600 * In all cases it returns 0 if it succeeded and an error if not. The
601 * service value is which part(s) of the API to initialize and is a
602 * direct map to the libshare sa_init(service) interface.
605 zfs_init_libshare(libzfs_handle_t *zhandle, int service)
609 if (_sa_init == NULL)
612 if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
614 * We had a cache miss. Most likely it is a new ZFS
615 * dataset that was just created. We want to make sure
616 * so check timestamps to see if a different process
617 * has updated any of the configuration. If there was
618 * some non-ZFS change, we need to re-initialize the
621 zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
622 if (_sa_needs_refresh != NULL &&
623 _sa_needs_refresh(zhandle->libzfs_sharehdl)) {
624 zfs_uninit_libshare(zhandle);
625 zhandle->libzfs_sharehdl = _sa_init(service);
629 if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
630 zhandle->libzfs_sharehdl = _sa_init(service);
632 if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
639 * zfs_uninit_libshare(zhandle)
641 * Uninitialize the libshare API if it hasn't already been
642 * uninitialized. It is OK to call multiple times.
645 zfs_uninit_libshare(libzfs_handle_t *zhandle)
647 if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) {
648 if (_sa_fini != NULL)
649 _sa_fini(zhandle->libzfs_sharehdl);
650 zhandle->libzfs_sharehdl = NULL;
655 * zfs_parse_options(options, proto)
657 * Call the legacy parse interface to get the protocol specific
658 * options using the NULL arg to indicate that this is a "parse" only.
661 zfs_parse_options(char *options, zfs_share_proto_t proto)
663 if (_sa_parse_legacy_options != NULL) {
664 return (_sa_parse_legacy_options(NULL, options,
665 proto_table[proto].p_name));
667 return (SA_CONFIG_ERR);
671 * zfs_sa_find_share(handle, path)
673 * wrapper around sa_find_share to find a share path in the
677 zfs_sa_find_share(sa_handle_t handle, char *path)
679 if (_sa_find_share != NULL)
680 return (_sa_find_share(handle, path));
685 * zfs_sa_enable_share(share, proto)
687 * Wrapper for sa_enable_share which enables a share for a specified
691 zfs_sa_enable_share(sa_share_t share, char *proto)
693 if (_sa_enable_share != NULL)
694 return (_sa_enable_share(share, proto));
695 return (SA_CONFIG_ERR);
699 * zfs_sa_disable_share(share, proto)
701 * Wrapper for sa_enable_share which disables a share for a specified
705 zfs_sa_disable_share(sa_share_t share, char *proto)
707 if (_sa_disable_share != NULL)
708 return (_sa_disable_share(share, proto));
709 return (SA_CONFIG_ERR);
713 * Share the given filesystem according to the options in the specified
714 * protocol specific properties (sharenfs, sharesmb). We rely
715 * on "libshare" to the dirty work for us.
718 zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
720 char mountpoint[ZFS_MAXPROPLEN];
721 char shareopts[ZFS_MAXPROPLEN];
722 char sourcestr[ZFS_MAXPROPLEN];
723 libzfs_handle_t *hdl = zhp->zfs_hdl;
725 zfs_share_proto_t *curr_proto;
726 zprop_source_t sourcetype;
729 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
732 if ((ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
733 (void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
734 dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
735 zfs_get_name(zhp), _sa_errorstr != NULL ?
736 _sa_errorstr(ret) : "");
740 for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
742 * Return success if there are no share options.
744 if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
745 shareopts, sizeof (shareopts), &sourcetype, sourcestr,
746 ZFS_MAXPROPLEN, B_FALSE) != 0 ||
747 strcmp(shareopts, "off") == 0)
751 * If the 'zoned' property is set, then zfs_is_mountable()
752 * will have already bailed out if we are in the global zone.
753 * But local zones cannot be NFS servers, so we ignore it for
754 * local zones as well.
756 if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
759 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint);
762 * This may be a new file system that was just
763 * created so isn't in the internal cache
764 * (second time through). Rather than
765 * reloading the entire configuration, we can
766 * assume ZFS has done the checking and it is
767 * safe to add this to the internal
770 if (_sa_zfs_process_share(hdl->libzfs_sharehdl,
771 NULL, NULL, mountpoint,
772 proto_table[*curr_proto].p_name, sourcetype,
773 shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
774 (void) zfs_error_fmt(hdl,
775 proto_table[*curr_proto].p_share_err,
776 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
780 hdl->libzfs_shareflags |= ZFSSHARE_MISS;
781 share = zfs_sa_find_share(hdl->libzfs_sharehdl,
786 err = zfs_sa_enable_share(share,
787 proto_table[*curr_proto].p_name);
789 (void) zfs_error_fmt(hdl,
790 proto_table[*curr_proto].p_share_err,
791 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
796 (void) zfs_error_fmt(hdl,
797 proto_table[*curr_proto].p_share_err,
798 dgettext(TEXT_DOMAIN, "cannot share '%s'"),
809 zfs_share_nfs(zfs_handle_t *zhp)
811 return (zfs_share_proto(zhp, nfs_only));
815 zfs_share_smb(zfs_handle_t *zhp)
817 return (zfs_share_proto(zhp, smb_only));
821 zfs_shareall(zfs_handle_t *zhp)
823 return (zfs_share_proto(zhp, share_all_proto));
827 * Unshare a filesystem by mountpoint.
830 unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
831 zfs_share_proto_t proto)
837 * Mountpoint could get trashed if libshare calls getmntany
838 * which it does during API initialization, so strdup the
841 mntpt = zfs_strdup(hdl, mountpoint);
843 /* make sure libshare initialized */
844 if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
845 free(mntpt); /* don't need the copy anymore */
846 return (zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
847 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
848 name, _sa_errorstr(err)));
851 share = zfs_sa_find_share(hdl->libzfs_sharehdl, mntpt);
852 free(mntpt); /* don't need the copy anymore */
855 err = zfs_sa_disable_share(share, proto_table[proto].p_name);
857 return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
858 dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
859 name, _sa_errorstr(err)));
862 return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
863 dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
870 * Unshare the given filesystem.
873 zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint,
874 zfs_share_proto_t *proto)
876 libzfs_handle_t *hdl = zhp->zfs_hdl;
880 /* check to see if need to unmount the filesystem */
881 rewind(zhp->zfs_hdl->libzfs_mnttab);
882 if (mountpoint != NULL)
883 mountpoint = mntpt = zfs_strdup(hdl, mountpoint);
885 if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
886 libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) {
887 zfs_share_proto_t *curr_proto;
889 if (mountpoint == NULL)
890 mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
892 for (curr_proto = proto; *curr_proto != PROTO_END;
895 if (is_shared(hdl, mntpt, *curr_proto) &&
896 unshare_one(hdl, zhp->zfs_name,
897 mntpt, *curr_proto) != 0) {
911 zfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint)
913 return (zfs_unshare_proto(zhp, mountpoint, nfs_only));
917 zfs_unshare_smb(zfs_handle_t *zhp, const char *mountpoint)
919 return (zfs_unshare_proto(zhp, mountpoint, smb_only));
923 * Same as zfs_unmountall(), but for NFS and SMB unshares.
926 zfs_unshareall_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
928 prop_changelist_t *clp;
931 clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0);
935 ret = changelist_unshare(clp, proto);
936 changelist_free(clp);
942 zfs_unshareall_nfs(zfs_handle_t *zhp)
944 return (zfs_unshareall_proto(zhp, nfs_only));
948 zfs_unshareall_smb(zfs_handle_t *zhp)
950 return (zfs_unshareall_proto(zhp, smb_only));
954 zfs_unshareall(zfs_handle_t *zhp)
956 return (zfs_unshareall_proto(zhp, share_all_proto));
960 zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint)
962 return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
966 * Remove the mountpoint associated with the current dataset, if necessary.
967 * We only remove the underlying directory if:
969 * - The mountpoint is not 'none' or 'legacy'
970 * - The mountpoint is non-empty
971 * - The mountpoint is the default or inherited
972 * - The 'zoned' property is set, or we're in a local zone
974 * Any other directories we leave alone.
977 remove_mountpoint(zfs_handle_t *zhp)
979 char mountpoint[ZFS_MAXPROPLEN];
980 zprop_source_t source;
982 if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
986 if (source == ZPROP_SRC_DEFAULT ||
987 source == ZPROP_SRC_INHERITED) {
989 * Try to remove the directory, silently ignoring any errors.
990 * The filesystem may have since been removed or moved around,
991 * and this error isn't really useful to the administrator in
994 (void) rmdir(mountpoint);
999 libzfs_add_handle(get_all_cb_t *cbp, zfs_handle_t *zhp)
1001 if (cbp->cb_alloc == cbp->cb_used) {
1005 newsz = cbp->cb_alloc ? cbp->cb_alloc * 2 : 64;
1006 ptr = zfs_realloc(zhp->zfs_hdl,
1007 cbp->cb_handles, cbp->cb_alloc * sizeof (void *),
1008 newsz * sizeof (void *));
1009 cbp->cb_handles = ptr;
1010 cbp->cb_alloc = newsz;
1012 cbp->cb_handles[cbp->cb_used++] = zhp;
1016 mount_cb(zfs_handle_t *zhp, void *data)
1018 get_all_cb_t *cbp = data;
1020 if (!(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM)) {
1025 if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
1030 libzfs_add_handle(cbp, zhp);
1031 if (zfs_iter_filesystems(zhp, mount_cb, cbp) != 0) {
1039 libzfs_dataset_cmp(const void *a, const void *b)
1041 zfs_handle_t **za = (zfs_handle_t **)a;
1042 zfs_handle_t **zb = (zfs_handle_t **)b;
1043 char mounta[MAXPATHLEN];
1044 char mountb[MAXPATHLEN];
1045 boolean_t gota, gotb;
1047 if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
1048 verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
1049 sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
1050 if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
1051 verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
1052 sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
1055 return (strcmp(mounta, mountb));
1062 return (strcmp(zfs_get_name(a), zfs_get_name(b)));
1066 * Mount and share all datasets within the given pool. This assumes that no
1067 * datasets within the pool are currently mounted. Because users can create
1068 * complicated nested hierarchies of mountpoints, we first gather all the
1069 * datasets and mountpoints within the pool, and sort them by mountpoint. Once
1070 * we have the list of all filesystems, we iterate over them in order and mount
1071 * and/or share each one.
1073 #pragma weak zpool_mount_datasets = zpool_enable_datasets
1075 zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
1077 get_all_cb_t cb = { 0 };
1078 libzfs_handle_t *hdl = zhp->zpool_hdl;
1084 * Gather all non-snap datasets within the pool.
1086 if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_DATASET)) == NULL)
1089 libzfs_add_handle(&cb, zfsp);
1090 if (zfs_iter_filesystems(zfsp, mount_cb, &cb) != 0)
1093 * Sort the datasets by mountpoint.
1095 qsort(cb.cb_handles, cb.cb_used, sizeof (void *),
1096 libzfs_dataset_cmp);
1099 * And mount all the datasets, keeping track of which ones
1100 * succeeded or failed.
1102 if ((good = zfs_alloc(zhp->zpool_hdl,
1103 cb.cb_used * sizeof (int))) == NULL)
1107 for (i = 0; i < cb.cb_used; i++) {
1108 if (zfs_mount(cb.cb_handles[i], mntopts, flags) != 0)
1115 * Then share all the ones that need to be shared. This needs
1116 * to be a separate pass in order to avoid excessive reloading
1117 * of the configuration. Good should never be NULL since
1118 * zfs_alloc is supposed to exit if memory isn't available.
1120 for (i = 0; i < cb.cb_used; i++) {
1121 if (good[i] && zfs_share(cb.cb_handles[i]) != 0)
1128 for (i = 0; i < cb.cb_used; i++)
1129 zfs_close(cb.cb_handles[i]);
1130 free(cb.cb_handles);
1136 mountpoint_compare(const void *a, const void *b)
1138 const char *mounta = *((char **)a);
1139 const char *mountb = *((char **)b);
1141 return (strcmp(mountb, mounta));
1144 /* alias for 2002/240 */
1145 #pragma weak zpool_unmount_datasets = zpool_disable_datasets
1147 * Unshare and unmount all datasets within the given pool. We don't want to
1148 * rely on traversing the DSL to discover the filesystems within the pool,
1149 * because this may be expensive (if not all of them are mounted), and can fail
1150 * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
1151 * gather all the filesystems that are currently mounted.
1154 zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
1157 struct mnttab entry;
1159 char **mountpoints = NULL;
1160 zfs_handle_t **datasets = NULL;
1161 libzfs_handle_t *hdl = zhp->zpool_hdl;
1164 int flags = (force ? MS_FORCE : 0);
1166 namelen = strlen(zhp->zpool_name);
1168 rewind(hdl->libzfs_mnttab);
1170 while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
1172 * Ignore non-ZFS entries.
1174 if (entry.mnt_fstype == NULL ||
1175 strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
1179 * Ignore filesystems not within this pool.
1181 if (entry.mnt_mountp == NULL ||
1182 strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 ||
1183 (entry.mnt_special[namelen] != '/' &&
1184 entry.mnt_special[namelen] != '\0'))
1188 * At this point we've found a filesystem within our pool. Add
1189 * it to our growing list.
1191 if (used == alloc) {
1193 if ((mountpoints = zfs_alloc(hdl,
1194 8 * sizeof (void *))) == NULL)
1197 if ((datasets = zfs_alloc(hdl,
1198 8 * sizeof (void *))) == NULL)
1205 if ((ptr = zfs_realloc(hdl, mountpoints,
1206 alloc * sizeof (void *),
1207 alloc * 2 * sizeof (void *))) == NULL)
1211 if ((ptr = zfs_realloc(hdl, datasets,
1212 alloc * sizeof (void *),
1213 alloc * 2 * sizeof (void *))) == NULL)
1221 if ((mountpoints[used] = zfs_strdup(hdl,
1222 entry.mnt_mountp)) == NULL)
1226 * This is allowed to fail, in case there is some I/O error. It
1227 * is only used to determine if we need to remove the underlying
1228 * mountpoint, so failure is not fatal.
1230 datasets[used] = make_dataset_handle(hdl, entry.mnt_special);
1236 * At this point, we have the entire list of filesystems, so sort it by
1239 qsort(mountpoints, used, sizeof (char *), mountpoint_compare);
1242 * Walk through and first unshare everything.
1244 for (i = 0; i < used; i++) {
1245 zfs_share_proto_t *curr_proto;
1246 for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
1248 if (is_shared(hdl, mountpoints[i], *curr_proto) &&
1249 unshare_one(hdl, mountpoints[i],
1250 mountpoints[i], *curr_proto) != 0)
1256 * Now unmount everything, removing the underlying directories as
1259 for (i = 0; i < used; i++) {
1260 if (unmount_one(hdl, mountpoints[i], flags) != 0)
1264 for (i = 0; i < used; i++) {
1266 remove_mountpoint(datasets[i]);
1271 for (i = 0; i < used; i++) {
1273 zfs_close(datasets[i]);
1274 free(mountpoints[i]);
1282 #else /* HAVE_ZPL */
1285 zfs_unshare_iscsi(zfs_handle_t *zhp)
1291 zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
1297 remove_mountpoint(zfs_handle_t *zhp) {
1302 is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
1308 zfs_is_mounted(zfs_handle_t *zhp, char **where)
1310 return is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where);
1314 zfs_is_shared(zfs_handle_t *zhp)
1320 zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
1326 zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
1330 #endif /* HAVE_ZPL */