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-rw-r--r--lib/libzfs/libzfs_changelist.c781
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diff --git a/lib/libzfs/libzfs_changelist.c b/lib/libzfs/libzfs_changelist.c
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+++ b/lib/libzfs/libzfs_changelist.c
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+/*
+ * 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
+ * or http://www.opensolaris.org/os/licensing.
+ * 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, 2020 by Delphix. All rights reserved.
+ * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
+ * Copyright (c) 2018 Datto Inc.
+ */
+
+#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
+ * mounted/shared. This prior state dictates whether we remount/reshare the
+ * 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 {
+ zfs_handle_t *cn_handle;
+ int cn_shared;
+ int cn_mounted;
+ int cn_zoned;
+ boolean_t cn_needpost; /* is postfix() needed? */
+ uu_avl_node_t cn_treenode;
+} prop_changenode_t;
+
+struct prop_changelist {
+ zfs_prop_t cl_prop;
+ zfs_prop_t cl_realprop;
+ zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */
+ uu_avl_pool_t *cl_pool;
+ uu_avl_t *cl_tree;
+ boolean_t cl_waslegacy;
+ boolean_t cl_allchildren;
+ boolean_t cl_alldependents;
+ int cl_mflags; /* Mount flags */
+ int cl_gflags; /* Gather request flags */
+ boolean_t cl_haszonedchild;
+};
+
+/*
+ * 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
+changelist_prefix(prop_changelist_t *clp)
+{
+ prop_changenode_t *cn;
+ uu_avl_walk_t *walk;
+ int ret = 0;
+ boolean_t commit_smb_shares = B_FALSE;
+
+ if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
+ clp->cl_prop != ZFS_PROP_SHARESMB)
+ return (0);
+
+ if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
+ return (-1);
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+
+ /* if a previous loop failed, set the remaining to false */
+ if (ret == -1) {
+ cn->cn_needpost = B_FALSE;
+ continue;
+ }
+
+ /*
+ * If we are in the global zone, but this dataset is exported
+ * to a local zone, do nothing.
+ */
+ if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
+ continue;
+
+ if (!ZFS_IS_VOLUME(cn->cn_handle)) {
+ /*
+ * Do the property specific processing.
+ */
+ switch (clp->cl_prop) {
+ case ZFS_PROP_MOUNTPOINT:
+ if (zfs_unmount(cn->cn_handle, NULL,
+ clp->cl_mflags) != 0) {
+ ret = -1;
+ cn->cn_needpost = B_FALSE;
+ }
+ break;
+ case ZFS_PROP_SHARESMB:
+ (void) zfs_unshare_smb(cn->cn_handle, NULL);
+ commit_smb_shares = B_TRUE;
+ break;
+
+ default:
+ break;
+ }
+ }
+ }
+
+ if (commit_smb_shares)
+ zfs_commit_smb_shares();
+ uu_avl_walk_end(walk);
+
+ if (ret == -1)
+ (void) changelist_postfix(clp);
+
+ return (ret);
+}
+
+/*
+ * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
+ * 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'.
+ * For non-legacy properties, we only remount/reshare the filesystem if it was
+ * previously mounted/shared. Otherwise, we always remount/reshare the
+ * filesystem.
+ */
+int
+changelist_postfix(prop_changelist_t *clp)
+{
+ prop_changenode_t *cn;
+ uu_avl_walk_t *walk;
+ char shareopts[ZFS_MAXPROPLEN];
+ int errors = 0;
+ boolean_t commit_smb_shares = B_FALSE;
+ boolean_t commit_nfs_shares = B_FALSE;
+
+ /*
+ * 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).
+ */
+ if ((cn = uu_avl_last(clp->cl_tree)) == NULL)
+ return (0);
+
+ if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
+ remove_mountpoint(cn->cn_handle);
+
+ /*
+ * 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 ((walk = uu_avl_walk_start(clp->cl_tree,
+ UU_WALK_REVERSE | UU_WALK_ROBUST)) == NULL)
+ return (-1);
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+
+ boolean_t sharenfs;
+ boolean_t sharesmb;
+ boolean_t mounted;
+ boolean_t needs_key;
+
+ /*
+ * If we are in the global zone, but this dataset is exported
+ * to a local zone, do nothing.
+ */
+ if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
+ continue;
+
+ /* Only do post-processing if it's required */
+ if (!cn->cn_needpost)
+ continue;
+ cn->cn_needpost = B_FALSE;
+
+ zfs_refresh_properties(cn->cn_handle);
+
+ if (ZFS_IS_VOLUME(cn->cn_handle))
+ continue;
+
+ /*
+ * Remount if previously mounted or mountpoint was legacy,
+ * or sharenfs or sharesmb property is set.
+ */
+ sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
+ shareopts, sizeof (shareopts), NULL, NULL, 0,
+ B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
+
+ sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
+ shareopts, sizeof (shareopts), NULL, NULL, 0,
+ B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));
+
+ needs_key = (zfs_prop_get_int(cn->cn_handle,
+ ZFS_PROP_KEYSTATUS) == ZFS_KEYSTATUS_UNAVAILABLE);
+
+ mounted = zfs_is_mounted(cn->cn_handle, NULL);
+
+ if (!mounted && !needs_key && (cn->cn_mounted ||
+ ((sharenfs || sharesmb || clp->cl_waslegacy) &&
+ (zfs_prop_get_int(cn->cn_handle,
+ ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {
+
+ if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
+ errors++;
+ else
+ mounted = TRUE;
+ }
+
+ /*
+ * 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.
+ */
+ if (sharenfs && mounted) {
+ errors += zfs_share_nfs(cn->cn_handle);
+ commit_nfs_shares = B_TRUE;
+ } else if (cn->cn_shared || clp->cl_waslegacy) {
+ errors += zfs_unshare_nfs(cn->cn_handle, NULL);
+ commit_nfs_shares = B_TRUE;
+ }
+ if (sharesmb && mounted) {
+ errors += zfs_share_smb(cn->cn_handle);
+ commit_smb_shares = B_TRUE;
+ } else if (cn->cn_shared || clp->cl_waslegacy) {
+ errors += zfs_unshare_smb(cn->cn_handle, NULL);
+ commit_smb_shares = B_TRUE;
+ }
+ }
+ if (commit_nfs_shares)
+ zfs_commit_nfs_shares();
+ if (commit_smb_shares)
+ zfs_commit_smb_shares();
+ uu_avl_walk_end(walk);
+
+ return (errors ? -1 : 0);
+}
+
+/*
+ * Is this "dataset" a child of "parent"?
+ */
+boolean_t
+isa_child_of(const char *dataset, const char *parent)
+{
+ int len;
+
+ len = strlen(parent);
+
+ if (strncmp(dataset, parent, len) == 0 &&
+ (dataset[len] == '@' || dataset[len] == '/' ||
+ dataset[len] == '\0'))
+ 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
+changelist_rename(prop_changelist_t *clp, const char *src, const char *dst)
+{
+ prop_changenode_t *cn;
+ uu_avl_walk_t *walk;
+ char newname[ZFS_MAX_DATASET_NAME_LEN];
+
+ if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
+ return;
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+ /*
+ * Do not rename a clone that's not in the source hierarchy.
+ */
+ if (!isa_child_of(cn->cn_handle->zfs_name, src))
+ continue;
+
+ /*
+ * Destroy the previous mountpoint if needed.
+ */
+ remove_mountpoint(cn->cn_handle);
+
+ (void) strlcpy(newname, dst, sizeof (newname));
+ (void) strlcat(newname, cn->cn_handle->zfs_name + strlen(src),
+ sizeof (newname));
+
+ (void) strlcpy(cn->cn_handle->zfs_name, newname,
+ sizeof (cn->cn_handle->zfs_name));
+ }
+
+ uu_avl_walk_end(walk);
+}
+
+/*
+ * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property,
+ * unshare all the datasets in the list.
+ */
+int
+changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto)
+{
+ prop_changenode_t *cn;
+ uu_avl_walk_t *walk;
+ int ret = 0;
+
+ if (clp->cl_prop != ZFS_PROP_SHARENFS &&
+ clp->cl_prop != ZFS_PROP_SHARESMB)
+ return (0);
+
+ if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
+ return (-1);
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+ if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0)
+ ret = -1;
+ }
+
+ zfs_commit_proto(proto);
+ uu_avl_walk_end(walk);
+
+ 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
+changelist_haszonedchild(prop_changelist_t *clp)
+{
+ return (clp->cl_haszonedchild);
+}
+
+/*
+ * Remove a node from a gathered list.
+ */
+void
+changelist_remove(prop_changelist_t *clp, const char *name)
+{
+ prop_changenode_t *cn;
+ uu_avl_walk_t *walk;
+
+ if ((walk = uu_avl_walk_start(clp->cl_tree, UU_WALK_ROBUST)) == NULL)
+ return;
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+ if (strcmp(cn->cn_handle->zfs_name, name) == 0) {
+ uu_avl_remove(clp->cl_tree, cn);
+ zfs_close(cn->cn_handle);
+ free(cn);
+ uu_avl_walk_end(walk);
+ return;
+ }
+ }
+
+ uu_avl_walk_end(walk);
+}
+
+/*
+ * Release any memory associated with a changelist.
+ */
+void
+changelist_free(prop_changelist_t *clp)
+{
+ prop_changenode_t *cn;
+
+ if (clp->cl_tree) {
+ uu_avl_walk_t *walk;
+
+ if ((walk = uu_avl_walk_start(clp->cl_tree,
+ UU_WALK_ROBUST)) == NULL)
+ return;
+
+ while ((cn = uu_avl_walk_next(walk)) != NULL) {
+ uu_avl_remove(clp->cl_tree, cn);
+ zfs_close(cn->cn_handle);
+ free(cn);
+ }
+
+ uu_avl_walk_end(walk);
+ uu_avl_destroy(clp->cl_tree);
+ }
+ if (clp->cl_pool)
+ uu_avl_pool_destroy(clp->cl_pool);
+
+ free(clp);
+}
+
+/*
+ * Add one dataset to changelist
+ */
+static int
+changelist_add_mounted(zfs_handle_t *zhp, void *data)
+{
+ prop_changelist_t *clp = data;
+ prop_changenode_t *cn;
+ uu_avl_index_t idx;
+
+ ASSERT3U(clp->cl_prop, ==, ZFS_PROP_MOUNTPOINT);
+
+ if ((cn = zfs_alloc(zfs_get_handle(zhp),
+ sizeof (prop_changenode_t))) == NULL) {
+ zfs_close(zhp);
+ return (ENOMEM);
+ }
+
+ cn->cn_handle = zhp;
+ cn->cn_mounted = zfs_is_mounted(zhp, NULL);
+ ASSERT3U(cn->cn_mounted, ==, B_TRUE);
+ cn->cn_shared = zfs_is_shared(zhp);
+ cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
+ cn->cn_needpost = B_TRUE;
+
+ /* Indicate if any child is exported to a local zone. */
+ if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
+ clp->cl_haszonedchild = B_TRUE;
+
+ uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
+
+ if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
+ uu_avl_insert(clp->cl_tree, cn, idx);
+ } else {
+ free(cn);
+ zfs_close(zhp);
+ }
+
+ return (0);
+}
+
+static int
+change_one(zfs_handle_t *zhp, void *data)
+{
+ prop_changelist_t *clp = data;
+ char property[ZFS_MAXPROPLEN];
+ char where[64];
+ prop_changenode_t *cn = NULL;
+ zprop_source_t sourcetype = ZPROP_SRC_NONE;
+ zprop_source_t share_sourcetype = ZPROP_SRC_NONE;
+ int ret = 0;
+
+ /*
+ * We only want to unmount/unshare those filesystems that may inherit
+ * 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.
+ */
+
+ if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) &&
+ zfs_prop_get(zhp, clp->cl_prop, property,
+ sizeof (property), &sourcetype, where, sizeof (where),
+ B_FALSE) != 0) {
+ goto out;
+ }
+
+ /*
+ * If we are "watching" sharenfs or sharesmb
+ * then check out the companion property which is tracked
+ * in cl_shareprop
+ */
+ if (clp->cl_shareprop != ZPROP_INVAL &&
+ zfs_prop_get(zhp, clp->cl_shareprop, property,
+ sizeof (property), &share_sourcetype, where, sizeof (where),
+ B_FALSE) != 0) {
+ goto out;
+ }
+
+ if (clp->cl_alldependents || clp->cl_allchildren ||
+ sourcetype == ZPROP_SRC_DEFAULT ||
+ sourcetype == ZPROP_SRC_INHERITED ||
+ (clp->cl_shareprop != ZPROP_INVAL &&
+ (share_sourcetype == ZPROP_SRC_DEFAULT ||
+ share_sourcetype == ZPROP_SRC_INHERITED))) {
+ if ((cn = zfs_alloc(zfs_get_handle(zhp),
+ sizeof (prop_changenode_t))) == NULL) {
+ ret = -1;
+ goto out;
+ }
+
+ cn->cn_handle = zhp;
+ cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
+ zfs_is_mounted(zhp, NULL);
+ cn->cn_shared = zfs_is_shared(zhp);
+ cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
+ cn->cn_needpost = B_TRUE;
+
+ /* Indicate if any child is exported to a local zone. */
+ if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
+ clp->cl_haszonedchild = B_TRUE;
+
+ uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
+
+ uu_avl_index_t idx;
+
+ if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
+ uu_avl_insert(clp->cl_tree, cn, idx);
+ } else {
+ free(cn);
+ cn = NULL;
+ }
+
+ if (!clp->cl_alldependents)
+ ret = zfs_iter_children(zhp, change_one, data);
+
+ /*
+ * If we added the handle to the changelist, we will re-use it
+ * later so return without closing it.
+ */
+ if (cn != NULL)
+ return (ret);
+ }
+
+out:
+ zfs_close(zhp);
+ return (ret);
+}
+
+static int
+compare_props(const void *a, const void *b, zfs_prop_t prop)
+{
+ const prop_changenode_t *ca = a;
+ const prop_changenode_t *cb = b;
+
+ char propa[MAXPATHLEN];
+ char propb[MAXPATHLEN];
+
+ boolean_t haspropa, haspropb;
+
+ haspropa = (zfs_prop_get(ca->cn_handle, prop, propa, sizeof (propa),
+ NULL, NULL, 0, B_FALSE) == 0);
+ haspropb = (zfs_prop_get(cb->cn_handle, prop, propb, sizeof (propb),
+ NULL, NULL, 0, B_FALSE) == 0);
+
+ if (!haspropa && haspropb)
+ return (-1);
+ else if (haspropa && !haspropb)
+ return (1);
+ else if (!haspropa && !haspropb)
+ return (0);
+ else
+ return (strcmp(propb, propa));
+}
+
+/*ARGSUSED*/
+static int
+compare_mountpoints(const void *a, const void *b, void *unused)
+{
+ /*
+ * 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.
+ */
+ return (compare_props(a, b, ZFS_PROP_MOUNTPOINT));
+}
+
+/*ARGSUSED*/
+static int
+compare_dataset_names(const void *a, const void *b, void *unused)
+{
+ return (compare_props(a, b, ZFS_PROP_NAME));
+}
+
+/*
+ * 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.
+ */
+prop_changelist_t *
+changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags,
+ int mnt_flags)
+{
+ prop_changelist_t *clp;
+ prop_changenode_t *cn;
+ zfs_handle_t *temp;
+ char property[ZFS_MAXPROPLEN];
+ boolean_t legacy = B_FALSE;
+
+ if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL)
+ 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.
+ */
+ if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED ||
+ prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS ||
+ prop == ZFS_PROP_SHARESMB) {
+
+ if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT,
+ property, sizeof (property),
+ NULL, NULL, 0, B_FALSE) == 0 &&
+ (strcmp(property, "legacy") == 0 ||
+ strcmp(property, "none") == 0)) {
+ legacy = B_TRUE;
+ }
+ }
+
+ clp->cl_pool = uu_avl_pool_create("changelist_pool",
+ sizeof (prop_changenode_t),
+ offsetof(prop_changenode_t, cn_treenode),
+ legacy ? compare_dataset_names : compare_mountpoints, 0);
+ if (clp->cl_pool == NULL) {
+ assert(uu_error() == UU_ERROR_NO_MEMORY);
+ (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
+ changelist_free(clp);
+ return (NULL);
+ }
+
+ clp->cl_tree = uu_avl_create(clp->cl_pool, NULL, UU_DEFAULT);
+ clp->cl_gflags = gather_flags;
+ clp->cl_mflags = mnt_flags;
+
+ if (clp->cl_tree == NULL) {
+ assert(uu_error() == UU_ERROR_NO_MEMORY);
+ (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error");
+ changelist_free(clp);
+ 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) {
+ clp->cl_prop = ZFS_PROP_MOUNTPOINT;
+ clp->cl_alldependents = B_TRUE;
+ } else if (prop == ZFS_PROP_ZONED) {
+ clp->cl_prop = ZFS_PROP_MOUNTPOINT;
+ clp->cl_allchildren = B_TRUE;
+ } else if (prop == ZFS_PROP_CANMOUNT) {
+ clp->cl_prop = ZFS_PROP_MOUNTPOINT;
+ } else if (prop == ZFS_PROP_VOLSIZE) {
+ clp->cl_prop = ZFS_PROP_MOUNTPOINT;
+ } else {
+ clp->cl_prop = prop;
+ }
+ clp->cl_realprop = prop;
+
+ if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
+ clp->cl_prop != ZFS_PROP_SHARENFS &&
+ clp->cl_prop != ZFS_PROP_SHARESMB)
+ return (clp);
+
+ /*
+ * If watching SHARENFS or SHARESMB then
+ * also watch its companion property.
+ */
+ if (clp->cl_prop == ZFS_PROP_SHARENFS)
+ clp->cl_shareprop = ZFS_PROP_SHARESMB;
+ else if (clp->cl_prop == ZFS_PROP_SHARESMB)
+ clp->cl_shareprop = ZFS_PROP_SHARENFS;
+
+ if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
+ (clp->cl_gflags & CL_GATHER_ITER_MOUNTED)) {
+ /*
+ * Instead of iterating through all of the dataset children we
+ * gather mounted dataset children from MNTTAB
+ */
+ if (zfs_iter_mounted(zhp, changelist_add_mounted, clp) != 0) {
+ changelist_free(clp);
+ return (NULL);
+ }
+ } else if (clp->cl_alldependents) {
+ if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) {
+ changelist_free(clp);
+ return (NULL);
+ }
+ } else if (zfs_iter_children(zhp, change_one, clp) != 0) {
+ changelist_free(clp);
+ return (NULL);
+ }
+
+ /*
+ * We have to re-open ourselves because we auto-close all the handles
+ * and can't tell the difference.
+ */
+ if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp),
+ ZFS_TYPE_DATASET)) == NULL) {
+ changelist_free(clp);
+ return (NULL);
+ }
+
+ /*
+ * Always add ourself to the list. We add ourselves to the end so that
+ * we're the last to be unmounted.
+ */
+ if ((cn = zfs_alloc(zhp->zfs_hdl,
+ sizeof (prop_changenode_t))) == NULL) {
+ zfs_close(temp);
+ changelist_free(clp);
+ return (NULL);
+ }
+
+ cn->cn_handle = temp;
+ cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) ||
+ zfs_is_mounted(temp, NULL);
+ cn->cn_shared = zfs_is_shared(temp);
+ cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED);
+ cn->cn_needpost = B_TRUE;
+
+ uu_avl_node_init(cn, &cn->cn_treenode, clp->cl_pool);
+ uu_avl_index_t idx;
+ if (uu_avl_find(clp->cl_tree, cn, NULL, &idx) == NULL) {
+ uu_avl_insert(clp->cl_tree, cn, idx);
+ } else {
+ free(cn);
+ zfs_close(temp);
+ }
+
+ /*
+ * If the mountpoint property was previously 'legacy', or 'none',
+ * record it as the behavior of changelist_postfix() will be different.
+ */
+ if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) {
+ /*
+ * do not automatically mount ex-legacy datasets if
+ * we specifically set canmount to noauto
+ */
+ if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) !=
+ ZFS_CANMOUNT_NOAUTO)
+ clp->cl_waslegacy = B_TRUE;
+ }
+
+ return (clp);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-22 08:24:14 +0000