Author: avg
Date: Sun Apr  3 07:42:13 2016
New Revision: 297521
URL: https://svnweb.freebsd.org/changeset/base/297521

Log:
  fix zfs set canmount=off on an unmounted filesystem
  
  Previously this operation tried to unmount and remount children.
  Also see https://www.illumos.org/issues/6428.
  
  MFC after:    2 weeks
  X-Needs-Upstreaming:  illumos

Modified:
  head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c

Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
==============================================================================
--- head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c    Sun Apr 
 3 07:40:33 2016        (r297520)
+++ head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c    Sun Apr 
 3 07:42:13 2016        (r297521)
@@ -1633,8 +1633,9 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvl
                 * its canmount property to 'on' or 'noauto'.  We only use
                 * the changelist logic to unmount when setting canmount=off.
                 */
-               if (!(prop == ZFS_PROP_CANMOUNT &&
-                   fnvpair_value_uint64(elem) != ZFS_CANMOUNT_OFF)) {
+               if (prop != ZFS_PROP_CANMOUNT ||
+                   (fnvpair_value_uint64(elem) == ZFS_CANMOUNT_OFF &&
+                    zfs_is_mounted(zhp, NULL))) {
                        cls[cl_idx] = changelist_gather(zhp, prop, 0, 0);
                        if (cls[cl_idx] == NULL)
                                goto error;
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