libzfs_changelist.c revision f3861e1a2ceec23a5b699c24d814b7775a9e0b52
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b12a1c38fc215cc54fa6014069fd2b8dbb496646lling * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Use is subject to license terms.
fa9e4066f08beec538e775443c5be79dd423fcabahrens#pragma ident "%Z%%M% %I% %E% SMI"
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Structure to keep track of dataset state. Before changing the 'sharenfs' or
fa9e4066f08beec538e775443c5be79dd423fcabahrens * 'mountpoint' property, we record whether the filesystem was previously
fa9e4066f08beec538e775443c5be79dd423fcabahrens * mounted/shared. This prior state dictates whether we remount/reshare the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * dataset after the property has been changed.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The interface consists of the following sequence of functions:
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_gather()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_prefix()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * < change property >
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_postfix()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_free()
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Other interfaces:
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling * changelist_remove() - remove a node from a gathered list
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_rename() - renames all datasets appropriately when doing a rename
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_unshare() - unshares all the nodes in a given changelist
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changelist_haszonedchild() - check if there is any child exported to
fa9e4066f08beec538e775443c5be79dd423fcabahrens * a local zone
fa9e4066f08beec538e775443c5be79dd423fcabahrenstypedef struct prop_changenode {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If the property is 'mountpoint', go through and unmount filesystems as
fa9e4066f08beec538e775443c5be79dd423fcabahrens * necessary. We don't do the same for 'sharenfs', because we can just re-share
fa9e4066f08beec538e775443c5be79dd423fcabahrens * with different options without interrupting service.
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If we are in the global zone, but this dataset is exported
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * to a local zone, do nothing.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If this was a rename, unshare the zvol, and
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * remove the /dev/zvol links.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If this was a change to the volume size, we
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * need to unshare and reshare the volume.
fa9e4066f08beec538e775443c5be79dd423fcabahrens } else if (zfs_unmount(cn->cn_handle, NULL, clp->cl_flags) != 0)
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
fa9e4066f08beec538e775443c5be79dd423fcabahrens * reshare the filesystems as necessary. In changelist_gather() we recorded
fa9e4066f08beec538e775443c5be79dd423fcabahrens * whether the filesystem was previously shared or mounted. The action we take
fa9e4066f08beec538e775443c5be79dd423fcabahrens * depends on the previous state, and whether the value was previously 'legacy'.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * For non-legacy properties, we only remount/reshare the filesystem if it was
fa9e4066f08beec538e775443c5be79dd423fcabahrens * previously mounted/shared. Otherwise, we always remount/reshare the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * filesystem.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we're changing the mountpoint, attempt to destroy the underlying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * mountpoint. All other datasets will have inherited from this dataset
fa9e4066f08beec538e775443c5be79dd423fcabahrens * (in which case their mountpoints exist in the filesystem in the new
fa9e4066f08beec538e775443c5be79dd423fcabahrens * location), or have explicit mountpoints set (in which case they won't
fa9e4066f08beec538e775443c5be79dd423fcabahrens * be in the changelist).
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We walk the datasets in reverse, because we want to mount any parent
fa9e4066f08beec538e775443c5be79dd423fcabahrens * datasets before mounting the children.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If we are in the global zone, but this dataset is exported
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * to a local zone, do nothing.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If we're doing a rename, recreate the /dev/zvol
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We always re-share even if the filesystem is currently
fa9e4066f08beec538e775443c5be79dd423fcabahrens * shared, so that we can adopt any new options.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl (clp->cl_prop == ZFS_PROP_SHARENFS && clp->cl_waslegacy)) {
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling * Is this "dataset" a child of "parent"?
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling /* snapshot does not have a child */
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * If we rename a filesystem, child filesystem handles are no longer valid
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * since we identify each dataset by its name in the ZFS namespace. As a
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * result, we have to go through and fix up all the names appropriately. We
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * could do this automatically if libzfs kept track of all open handles, but
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * this is a lot less work.
fa9e4066f08beec538e775443c5be79dd423fcabahrenschangelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling * Do not rename a clone that's not in the source hierarchy.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Destroy the previous mountpoint if needed.
fa9e4066f08beec538e775443c5be79dd423fcabahrens (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src));
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Given a gathered changelist for the 'sharenfs' property, unshare all the
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * datasets in the list.
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Check if there is any child exported to a local zone in a given changelist.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * This information has already been recorded while gathering the changelist
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * via changelist_gather().
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling * Remove a node from a gathered list.
b12a1c38fc215cc54fa6014069fd2b8dbb496646llingchangelist_remove(zfs_handle_t *zhp, prop_changelist_t *clp)
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling if (strcmp(cn->cn_handle->zfs_name, zhp->zfs_name) == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Release any memory associated with a changelist.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * We only want to unmount/unshare those filesystems that may inherit
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * from the target filesystem. If we find any filesystem with a
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * locally set mountpoint, we ignore any children since changing the
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * property will not affect them. If this is a rename, we iterate
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * over all children regardless, since we need them unmounted in
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * order to do the rename. Also, if this is a volume and we're doing
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * a rename, then always add it to the changelist.
e9dbad6f263d5570ed7ff5443ec5b958af8c24d7eschrock if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
fa9e4066f08beec538e775443c5be79dd423fcabahrens sizeof (property), &sourcetype, where, sizeof (where),
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling sourcetype == ZFS_SRC_DEFAULT || sourcetype == ZFS_SRC_INHERITED) {
99653d4ee642c6528e88224f12409a5f23060994eschrock return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl /* Indicate if any child is exported to a local zone. */
fa9e4066f08beec538e775443c5be79dd423fcabahrens uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock/*ARGSUSED*/
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrockcompare_mountpoints(const void *a, const void *b, void *unused)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * When unsharing or unmounting filesystems, we need to do it in
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * mountpoint order. This allows the user to have a mountpoint
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * hierarchy that is different from the dataset hierarchy, and still
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * allow it to be changed. However, if either dataset doesn't have a
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * mountpoint (because it is a volume or a snapshot), we place it at the
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * end of the list, because it doesn't affect our change at all.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta,
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb,
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (-1);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (1);
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock return (0);
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Given a ZFS handle and a property, construct a complete list of datasets
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * that need to be modified as part of this process. For anything but the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Otherwise, we iterate over all children and look for any datasets that
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * inherit the property. For each such dataset, we add it to the list and
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * mark whether it was shared beforehand.
fa9e4066f08beec538e775443c5be79dd423fcabahrenschangelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int flags)
99653d4ee642c6528e88224f12409a5f23060994eschrock if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * For mountpoint-related tasks, we want to sort everything by
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * mountpoint, so that we mount and unmount them in the appropriate
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock * order, regardless of their position in the hierarchy.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens clp->cl_pool = uu_list_pool_create("changelist_pool",
94de1d4cf6ec0a3bf040dcc4b8df107c4ed36b51eschrock (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
94de1d4cf6ec0a3bf040dcc4b8df107c4ed36b51eschrock (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If this is a rename or the 'zoned' property, we pretend we're
fa9e4066f08beec538e775443c5be79dd423fcabahrens * changing the mountpoint and flag it so we can catch all children in
fa9e4066f08beec538e775443c5be79dd423fcabahrens * change_one().
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * Flag cl_alldependents to catch all children plus the dependents
f3861e1a2ceec23a5b699c24d814b7775a9e0b52ahl * (clones) that are not in the hierarchy.
3bb79bece53191f2cf27aa61a72ea1784a7ce700eschrock if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
b12a1c38fc215cc54fa6014069fd2b8dbb496646lling } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens * We have to re-open ourselves because we auto-close all the handles
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and can't tell the difference.
99653d4ee642c6528e88224f12409a5f23060994eschrock if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Always add ourself to the list. We add ourselves to the end so that
fa9e4066f08beec538e775443c5be79dd423fcabahrens * we're the last to be unmounted.
fa9e4066f08beec538e775443c5be79dd423fcabahrens cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
fa9e4066f08beec538e775443c5be79dd423fcabahrens uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool);
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If the property was previously 'legacy' or 'none', record this fact,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * as the behavior of changelist_postfix() will be different.
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (zfs_prop_get(zhp, prop, property, sizeof (property),