/*
* Walk up the tree and:
* 1. release pseudo exportinfo if it has no child
* 2. release visible in parent's exportinfo
* 3. delete non-exported leaf nodes from tree
*
* Deleting of nodes will start only if the unshared
* node was a leaf node.
* Deleting of nodes will finish when we reach a node which
* has children or is a real export, then we might still need
* to continue releasing visibles, until we reach VROOT node.
*/
void
treeclimb_unexport(struct exportinfo *exip)
{
treenode_t *tnode, *old_nd;
treenode_t *connect_point = NULL;
ASSERT(RW_WRITE_HELD(&exported_lock));
tnode = exip->exi_tree;
/*
* The unshared exportinfo was unlinked in unexport().
* Zeroing tree_exi ensures that we will skip it.
*/
tnode->tree_exi = NULL;
if (tnode->tree_vis != NULL) /* system root has tree_vis == NULL */
tnode->tree_vis->vis_exported = 0;
while (tnode != NULL) {
/* Stop at VROOT node which is exported or has child */
if (TREE_ROOT(tnode) &&
(TREE_EXPORTED(tnode) || tnode->tree_child_first != NULL))
break;
/* Release pseudo export if it has no child */
if (TREE_ROOT(tnode) && !TREE_EXPORTED(tnode) &&
tnode->tree_child_first == NULL) {
export_unlink(tnode->tree_exi);
exi_rele(tnode->tree_exi);
}
/* Release visible in parent's exportinfo */
if (tnode->tree_vis != NULL)
less_visible(vis2exi(tnode), tnode->tree_vis);
/* Continue with parent */
old_nd = tnode;
tnode = tnode->tree_parent;
/* Remove itself, if this is a leaf and non-exported node */
if (old_nd->tree_child_first == NULL &&
!TREE_EXPORTED(old_nd)) {
tree_remove_node(old_nd);
connect_point = tnode;
}
}
/* Update the change timestamp */
if (connect_point != NULL)
tree_update_change(connect_point, NULL);
}
/*
* Given an exportinfo, climb up to find the exportinfo for the VROOT
* of the filesystem.
*
* e.g. /
* |
* a (VROOT) pseudo-exportinfo
* |
* b
* |
* c #share /a/b/c
* |
* d
*
* where c is in the same filesystem as a.
* So, get_root_export(*exportinfo_for_c) returns exportinfo_for_a
*
* If d is shared, then c will be put into a's visible list.
* Note: visible list is per filesystem and is attached to the
* VROOT exportinfo.
*/
struct exportinfo *
get_root_export(struct exportinfo *exip)
{
treenode_t *tnode = exip->exi_tree;
exportinfo_t *exi = NULL;
while (tnode) {
if (TREE_ROOT(tnode)) {
exi = tnode->tree_exi;
break;
}
tnode = tnode->tree_parent;
}
ASSERT(exi);
return (exi);
}
