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autofs-5.1.7 - add tree_mapent_traverse_subtree()
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From: Ian Kent <raven@themaw.net>
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Add function tree_mapent_traverse_subtree() that enumerates offsets from
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a given base node bounded by subtree nesting points.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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lib/mounts.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 48 insertions(+)
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diff --git a/CHANGELOG b/CHANGELOG
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index 488b4996..390028ac 100644
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--- a/CHANGELOG
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+++ b/CHANGELOG
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@@ -35,6 +35,7 @@
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- add mapent tree implementation.
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- add tree_mapent_add_node().
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- add tree_mapent_delete_offsets().
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+- add tree_mapent_traverse_subtree().
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25/01/2021 autofs-5.1.7
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- make bind mounts propagation slave by default.
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diff --git a/lib/mounts.c b/lib/mounts.c
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index eb700c79..fded4c09 100644
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--- a/lib/mounts.c
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+++ b/lib/mounts.c
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@@ -1528,6 +1528,53 @@ int tree_mapent_add_node(struct mapent_cache *mc,
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return 1;
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}
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+static inline int tree_mapent_is_root(struct mapent *oe)
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+{
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+ /* Offset "/" is a special case, it's looked up and mounted
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+ * seperately because the offset tree may or may not have a
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+ * real mount at the base and the triggers inside it need to
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+ * be mounted in either case. Also the order requires the
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+ * offset at the top of the (sub)tree to be handled after
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+ * the traversal.
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+ */
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+ return (oe->key[oe->len - 1] == '/' ||
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+ MAPENT_ROOT(oe) == MAPENT_NODE(oe));
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+}
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+
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+struct traverse_subtree_context {
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+ struct autofs_point *ap;
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+ struct tree_node *base;
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+ int strict;
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+};
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+
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+static int tree_mapent_traverse_subtree(struct tree_node *n, tree_work_fn_t work, void *ptr)
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+{
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+ struct traverse_subtree_context *ctxt = ptr;
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+ struct mapent *oe = MAPENT(n);
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+ int ret = 1;
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+
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+ if (n->left) {
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+ ret = tree_mapent_traverse_subtree(n->left, work, ctxt);
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+ if (!ret && ctxt->strict)
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+ goto done;
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+ }
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+
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+ /* Node is not multi-mount root and is part of current subtree */
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+ if (!tree_mapent_is_root(oe) && MAPENT_PARENT(oe) == ctxt->base) {
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+ ret = work(n, ctxt);
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+ if (!ret && ctxt->strict)
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+ goto done;
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+ }
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+
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+ if (n->right) {
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+ ret = tree_mapent_traverse_subtree(n->right, work, ctxt);
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+ if (!ret && ctxt->strict)
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+ goto done;
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+ }
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+done:
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+ return ret;
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+}
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+
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static int tree_mapent_delete_offset_tree(struct tree_node *root)
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{
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struct mapent *me = MAPENT(root);
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