libzfs_mount.c revision ece3d9b3bacef51a5f34d993935eedbb7bb87059
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
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ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Common Development and Distribution License (the "License").
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
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fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
260921a4509dd7666c6613f413be409b66181642eschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident "%Z%%M% %I% %E% SMI"
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Routines to manage ZFS mounts. We separate all the nasty routines that have
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * to deal with the OS. The following functions are the main entry points --
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * they are used by mount and unmount and when changing a filesystem's
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * mountpoint.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_is_mounted()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_mount()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_unmount()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_unmountall()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * This file also contains the functions used to manage sharing filesystems via
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * NFS and iSCSI:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_is_shared()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_share()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * zfs_unshare()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_is_shared_nfs()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_share_nfs()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_unshare_nfs()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_unshareall_nfs()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_is_shared_iscsi()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_share_iscsi()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zfs_unshare_iscsi()
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * The following functions are available for pool consumers, and will
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * mount/unmount and share/unshare all datasets within pool:
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zpool_enable_datasets()
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * zpool_disable_datasets()
d8d59944799a436698b0d88b5e6ae6d7d2422797ahlstatic int (*iscsitgt_zfs_share)(const char *);
d8d59944799a436698b0d88b5e6ae6d7d2422797ahlstatic int (*iscsitgt_zfs_unshare)(const char *);
d8d59944799a436698b0d88b5e6ae6d7d2422797ahlstatic int (*iscsitgt_zfs_is_shared)(const char *);
d8d59944799a436698b0d88b5e6ae6d7d2422797ahlstatic void
d8d59944799a436698b0d88b5e6ae6d7d2422797ahl (iscsitgt_zfs_share = (int (*)(const char *))dlsym(libiscsitgt,
d8d59944799a436698b0d88b5e6ae6d7d2422797ahl (iscsitgt_zfs_unshare = (int (*)(const char *))dlsym(libiscsitgt,
d8d59944799a436698b0d88b5e6ae6d7d2422797ahl (iscsitgt_zfs_is_shared = (int (*)(const char *))dlsym(libiscsitgt,
99653d4ee642c6528e88224f12409a5f23060994eschrock * Search the sharetab for the given mountpoint, returning true if it is found.
99653d4ee642c6528e88224f12409a5f23060994eschrockis_shared(libzfs_handle_t *hdl, const char *mountpoint)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
99653d4ee642c6528e88224f12409a5f23060994eschrock while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* the mountpoint is the first entry on each line */
99653d4ee642c6528e88224f12409a5f23060994eschrock * Returns true if the specified directory is empty. If we can't open the
99653d4ee642c6528e88224f12409a5f23060994eschrock * directory at all, return true so that the mount can fail with a more
fa9e4066f08beec538e775443c5be79dd423fcabahrens * informative error message.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Checks to see if the mount is active. If the filesystem is mounted, we fill
fa9e4066f08beec538e775443c5be79dd423fcabahrens * in 'where' with the current mountpoint, and return 1. Otherwise, we return
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Search for the entry in /etc/mnttab. We don't bother getting the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * mountpoint, as we can just search for the special device. This will
fa9e4066f08beec538e775443c5be79dd423fcabahrens * also let us find mounts when the mountpoint is 'legacy'.
99653d4ee642c6528e88224f12409a5f23060994eschrock if (getmntany(zhp->zfs_hdl->libzfs_mnttab, &entry, &search) != 0)
99653d4ee642c6528e88224f12409a5f23060994eschrock *where = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * Returns true if the given dataset is mountable, false otherwise. Returns the
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * mountpoint in 'buf'.
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrockzfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock &sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Mount the given filesystem.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_mount(zfs_handle_t *zhp, const char *options, int flags)
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
99653d4ee642c6528e88224f12409a5f23060994eschrock return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* Create the directory if it doesn't already exist */
99653d4ee642c6528e88224f12409a5f23060994eschrock "failed to create mountpoint"));
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Determine if the mountpoint is empty. If so, refuse to perform the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * mount. We don't perform this check if MS_OVERLAY is specified, which
fa9e4066f08beec538e775443c5be79dd423fcabahrens * would defeat the point. We also avoid this check if 'remount' is
fa9e4066f08beec538e775443c5be79dd423fcabahrens * specified.
99653d4ee642c6528e88224f12409a5f23060994eschrock "directory is not empty"));
99653d4ee642c6528e88224f12409a5f23060994eschrock dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* perform the mount */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
fa9e4066f08beec538e775443c5be79dd423fcabahrens MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Generic errors are nasty, but there are just way too many
fa9e4066f08beec538e775443c5be79dd423fcabahrens * from mount(), and they're well-understood. We pick a few
fa9e4066f08beec538e775443c5be79dd423fcabahrens * common ones to improve upon.
99653d4ee642c6528e88224f12409a5f23060994eschrock "mountpoint or dataset is busy"));
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Unmount a single filesystem.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrockunmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Unmount the given filesystem.
fa9e4066f08beec538e775443c5be79dd423fcabahrenszfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* check to see if need to unmount the filesystem */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
99653d4ee642c6528e88224f12409a5f23060994eschrock getmntany(zhp->zfs_hdl->libzfs_mnttab, &entry, &search) == 0)) {
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Unshare and unmount the filesystem
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Unmount this filesystem and any children inheriting the mountpoint property.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * To do this, just act like we're changing the mountpoint property, but don't
fa9e4066f08beec538e775443c5be79dd423fcabahrens * remount the filesystems afterwards.
fa9e4066f08beec538e775443c5be79dd423fcabahrens clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, flags);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Check to see if the filesystem is currently shared.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Share the given filesystem according to the options in 'sharenfs'. We rely
fa9e4066f08beec538e775443c5be79dd423fcabahrens * on share(1M) to the dirty work for us.
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Return success if there are no share options.
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zfs_prop_get(zhp, ZFS_PROP_SHARENFS, shareopts, sizeof (shareopts),
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * If the 'zoned' property is set, then zfs_is_mountable() will have
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * already bailed out if we are in the global zone. But local
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * zones cannot be NFS servers, so we ignore it for local zones as well.
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Invoke the share(1M) command. We always do this, even if it's
fa9e4066f08beec538e775443c5be79dd423fcabahrens * currently shared, as the options may have changed.
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) snprintf(buf, sizeof (buf), "/usr/sbin/share "
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) snprintf(buf, sizeof (buf), "/usr/sbin/share "
fa9e4066f08beec538e775443c5be79dd423fcabahrens * share(1M) should only produce output if there is some kind
fa9e4066f08beec538e775443c5be79dd423fcabahrens * of error. All output begins with "share_nfs: ", so we trim
fa9e4066f08beec538e775443c5be79dd423fcabahrens * this off to get to the real error.
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Unshare a filesystem by mountpoint.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrockunshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock "/usr/sbin/unshare \"%s\" 2>&1",
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * unshare(1M) should only produce output if there is
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * some kind of error. All output begins with "unshare
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * nfs: ", so we trim this off to get to the real error.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Unshare the given filesystem.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahlzfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint)
fa9e4066f08beec538e775443c5be79dd423fcabahrens /* check to see if need to unmount the filesystem */
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
99653d4ee642c6528e88224f12409a5f23060994eschrock getmntany(zhp->zfs_hdl->libzfs_mnttab, &entry, &search) == 0)) {
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock unshare_one(zhp->zfs_hdl, zhp->zfs_name, mountpoint) != 0)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Same as zfs_unmountall(), but for NFS unshares.
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Remove the mountpoint associated with the current dataset, if necessary.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We only remove the underlying directory if:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * - The mountpoint is not 'none' or 'legacy'
fa9e4066f08beec538e775443c5be79dd423fcabahrens * - The mountpoint is non-empty
fa9e4066f08beec538e775443c5be79dd423fcabahrens * - The mountpoint is the default or inherited
fa9e4066f08beec538e775443c5be79dd423fcabahrens * - The 'zoned' property is set, or we're in a local zone
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Any other directories we leave alone.
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Try to remove the directory, silently ignoring any errors.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The filesystem may have since been removed or moved around,
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock * and this error isn't really useful to the administrator in
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Return success if there are no share options.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (0);
d8d59944799a436698b0d88b5e6ae6d7d2422797ahl if (iscsitgt_zfs_share == NULL || iscsitgt_zfs_share(dataset) != 0)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If this fails with ENODEV it indicates that zvol wasn't shared so
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * we should return success in that case.
d8d59944799a436698b0d88b5e6ae6d7d2422797ahl (iscsitgt_zfs_unshare(dataset) != 0 && errno != ENODEV))
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl dgettext(TEXT_DOMAIN, "cannot unshare '%s'"), dataset));
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrocktypedef struct mount_cbdata {
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl if (!(zfs_get_type(zhp) & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME))) {
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (-1);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahldataset_cmp(const void *a, const void *b)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (-1);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (1);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Mount and share all datasets within the given pool. This assumes that no
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * datasets within the pool are currently mounted. Because users can create
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * complicated nested hierarchies of mountpoints, we first gather all the
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * datasets and mountpoints within the pool, and sort them by mountpoint. Once
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * we have the list of all filesystems, we iterate over them in order and mount
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * and/or share each one.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl#pragma weak zpool_mount_datasets = zpool_enable_datasets
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahlzpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Gather all datasets within the pool.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock if ((cb.cb_datasets = zfs_alloc(hdl, 4 * sizeof (void *))) == NULL)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (-1);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_ANY)) == NULL)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Sort the datasets by mountpoint.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl qsort(cb.cb_datasets, cb.cb_used, sizeof (void *), dataset_cmp);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * And mount all the datasets.
c08432ebe688ed6410b302771a9afd8e23e2a7cceschrock if (zfs_mount(cb.cb_datasets[i], mntopts, flags) != 0 ||
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Ignore snapshots and ignore failures from non-existant datasets.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl (zhp = zfs_open(hdl, dataset, ZFS_TYPE_VOLUME)) == NULL)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrockmountpoint_compare(const void *a, const void *b)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock const char *mounta = *((char **)a);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock const char *mountb = *((char **)b);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Unshare and unmount all datasets within the given pool. We don't want to
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * rely on traversing the DSL to discover the filesystems within the pool,
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * because this may be expensive (if not all of them are mounted), and can fail
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * gather all the filesystems that are currently mounted.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl#pragma weak zpool_unmount_datasets = zpool_disable_datasets
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahlzpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * First unshare all zvols.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl return (-1);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Ignore non-ZFS entries.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Ignore filesystems not within this pool.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 ||
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * At this point we've found a filesystem within our pool. Add
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * it to our growing list.
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock alloc * sizeof (void *),
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock alloc * sizeof (void *),
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * This is allowed to fail, in case there is some I/O error. It
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * is only used to determine if we need to remove the underlying
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * mountpoint, so failure is not fatal.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock datasets[used] = make_dataset_handle(hdl, entry.mnt_special);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * At this point, we have the entire list of filesystems, so sort it by
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * mountpoint.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock qsort(mountpoints, used, sizeof (char *), mountpoint_compare);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Walk through and first unshare everything.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock for (i = 0; i < used; i++) {
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock unshare_one(hdl, mountpoints[i], mountpoints[i]) != 0)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * Now unmount everything, removing the underlying directories as
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * appropriate.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock for (i = 0; i < used; i++) {
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock for (i = 0; i < used; i++) {
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock for (i = 0; i < used; i++) {