/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Portions Copyright 2007 Ramprakash Jelari
* Copyright (c) 2014, 2015 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
*/
#include <libintl.h>
#include <libuutil.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <zone.h>
#include <libzfs.h>
#include "libzfs_impl.h"
/*
* Structure to keep track of dataset state. Before changing the 'sharenfs' or
* 'mountpoint' property, we record whether the filesystem was previously
* dataset after the property has been changed.
*
* The interface consists of the following sequence of functions:
*
* changelist_gather()
* changelist_prefix()
* < change property >
* changelist_postfix()
* changelist_free()
*
* Other interfaces:
*
* changelist_remove() - remove a node from a gathered list
* changelist_rename() - renames all datasets appropriately when doing a rename
* changelist_unshare() - unshares all the nodes in a given changelist
* changelist_haszonedchild() - check if there is any child exported to
* a local zone
*/
typedef struct prop_changenode {
int cn_shared;
int cn_mounted;
int cn_zoned;
struct prop_changelist {
};
/*
* If the property is 'mountpoint', go through and unmount filesystems as
* necessary. We don't do the same for 'sharenfs', because we can just re-share
* with different options without interrupting service. We do handle 'sharesmb'
* since there may be old resource names that need to be removed.
*/
int
{
int ret = 0;
return (0);
/* if a previous loop failed, set the remaining to false */
if (ret == -1) {
continue;
}
/*
* If we are in the global zone, but this dataset is exported
* to a local zone, do nothing.
*/
continue;
/*
* Do the property specific processing.
*/
case ZFS_PROP_MOUNTPOINT:
ret = -1;
}
break;
case ZFS_PROP_SHARESMB:
break;
default:
break;
}
}
}
if (ret == -1)
(void) changelist_postfix(clp);
return (ret);
}
/*
* reshare the filesystems as necessary. In changelist_gather() we recorded
* whether the filesystem was previously shared or mounted. The action we take
* depends on the previous state, and whether the value was previously 'legacy'.
* filesystem.
*/
int
{
int errors = 0;
/*
* If we're changing the mountpoint, attempt to destroy the underlying
* mountpoint. All other datasets will have inherited from this dataset
* (in which case their mountpoints exist in the filesystem in the new
* location), or have explicit mountpoints set (in which case they won't
* be in the changelist).
*/
return (0);
/*
* It is possible that the changelist_prefix() used libshare
* to unshare some entries. Since libshare caches data, an
* attempt to reshare during postfix can fail unless libshare
* is uninitialized here so that it will reinitialize later.
*/
}
/*
* We walk the datasets in reverse, because we want to mount any parent
* datasets before mounting the children. We walk all datasets even if
* there are errors.
*/
/*
* If we are in the global zone, but this dataset is exported
* to a local zone, do nothing.
*/
continue;
/* Only do post-processing if it's required */
if (!cn->cn_needpost)
continue;
continue;
/*
* Remount if previously mounted or mountpoint was legacy,
* or sharenfs or sharesmb property is set.
*/
ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
errors++;
else
}
/*
* If the file system is mounted we always re-share even
* if the filesystem is currently shared, so that we can
* adopt any new options.
*/
}
return (errors ? -1 : 0);
}
/*
* Is this "dataset" a child of "parent"?
*/
{
int len;
return (B_TRUE);
else
return (B_FALSE);
}
/*
* If we rename a filesystem, child filesystem handles are no longer valid
* since we identify each dataset by its name in the ZFS namespace. As a
* result, we have to go through and fix up all the names appropriately. We
* could do this automatically if libzfs kept track of all open handles, but
* this is a lot less work.
*/
void
{
/*
* Do not rename a clone that's not in the source hierarchy.
*/
continue;
/*
* Destroy the previous mountpoint if needed.
*/
}
}
/*
* Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
* unshare all the datasets in the list.
*/
int
{
int ret = 0;
return (0);
ret = -1;
}
return (ret);
}
/*
* Check if there is any child exported to a local zone in a given changelist.
* This information has already been recorded while gathering the changelist
* via changelist_gather().
*/
int
{
return (clp->cl_haszonedchild);
}
/*
* Remove a node from a gathered list.
*/
void
{
return;
}
}
}
/*
* Release any memory associated with a changelist.
*/
void
{
void *cookie;
}
}
}
static int
{
/*
* from the target filesystem. If we find any filesystem with a
* locally set mountpoint, we ignore any children since changing the
* property will not affect them. If this is a rename, we iterate
* over all children regardless, since we need them unmounted in
* order to do the rename. Also, if this is a volume and we're doing
* a rename, then always add it to the changelist.
*/
B_FALSE) != 0) {
return (0);
}
/*
* If we are "watching" sharenfs or sharesmb
* then check out the companion property which is tracked
* in cl_shareprop
*/
B_FALSE) != 0) {
return (0);
}
sourcetype == ZPROP_SRC_DEFAULT ||
share_sourcetype == ZPROP_SRC_INHERITED))) {
sizeof (prop_changenode_t))) == NULL) {
return (-1);
}
/* Indicate if any child is exported to a local zone. */
&idx);
} else {
/*
* Add this child to beginning of the list. Children
* below this one in the hierarchy will get added above
* this one in the list. This produces a list in
* reverse dataset name order.
* This is necessary when the original mountpoint
* is legacy or none.
*/
}
if (!clp->cl_alldependents)
} else {
}
return (0);
}
/*ARGSUSED*/
static int
{
/*
* When unsharing or unmounting filesystems, we need to do it in
* mountpoint order. This allows the user to have a mountpoint
* hierarchy that is different from the dataset hierarchy, and still
* allow it to be changed. However, if either dataset doesn't have a
* mountpoint (because it is a volume or a snapshot), we place it at the
* end of the list, because it doesn't affect our change at all.
*/
return (-1);
return (1);
return (0);
else
}
/*
* Given a ZFS handle and a property, construct a complete list of datasets
* that need to be modified as part of this process. For anything but the
* 'mountpoint' and 'sharenfs' properties, this just returns an empty list.
* Otherwise, we iterate over all children and look for any datasets that
* inherit the property. For each such dataset, we add it to the list and
* mark whether it was shared beforehand.
*/
int mnt_flags)
{
return (NULL);
/*
* For mountpoint-related tasks, we want to sort everything by
* mountpoint, so that we mount and unmount them in the appropriate
* order, regardless of their position in the hierarchy.
*/
prop == ZFS_PROP_SHARESMB) {
}
if (!legacy) {
}
}
sizeof (prop_changenode_t),
compare, 0);
return (NULL);
}
return (NULL);
}
/*
* If this is a rename or the 'zoned' property, we pretend we're
* changing the mountpoint and flag it so we can catch all children in
* change_one().
*
* Flag cl_alldependents to catch all children plus the dependents
* (clones) that are not in the hierarchy.
*/
if (prop == ZFS_PROP_NAME) {
} else if (prop == ZFS_PROP_ZONED) {
} else if (prop == ZFS_PROP_CANMOUNT) {
} else if (prop == ZFS_PROP_VOLSIZE) {
} else {
}
return (clp);
/*
* If watching SHARENFS or SHARESMB then
* also watch its companion property.
*/
if (clp->cl_alldependents) {
return (NULL);
}
return (NULL);
}
/*
* We have to re-open ourselves because we auto-close all the handles
* and can't tell the difference.
*/
ZFS_TYPE_DATASET)) == NULL) {
return (NULL);
}
/*
* Always add ourself to the list. We add ourselves to the end so that
* we're the last to be unmounted.
*/
sizeof (prop_changenode_t))) == NULL) {
return (NULL);
}
} else {
/*
* Add the target dataset to the end of the list.
* The list is not really unsorted. The list will be
* in reverse dataset name order. This is necessary
* when the original mountpoint is legacy or none.
*/
}
/*
* If the mountpoint property was previously 'legacy', or 'none',
* record it as the behavior of changelist_postfix() will be different.
*/
/*
* do not automatically mount ex-legacy datasets if
* we specifically set canmount to noauto
*/
}
return (clp);
}