autofs/SOURCES/autofs-5.1.7-add-tree_mapent_delete_offsets.patch
2022-05-17 15:13:05 +00:00

120 lines
3.4 KiB
Diff

autofs-5.1.7 - add tree_mapent_delete_offsets()
From: Ian Kent <raven@themaw.net>
Add function tree_mapent_delete_offsets() to the mapent tree handling
implementation.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
include/mounts.h | 1 +
lib/mounts.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 72 insertions(+)
diff --git a/CHANGELOG b/CHANGELOG
index 85730eda..488b4996 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -34,6 +34,7 @@
- make tree implementation data independent.
- add mapent tree implementation.
- add tree_mapent_add_node().
+- add tree_mapent_delete_offsets().
25/01/2021 autofs-5.1.7
- make bind mounts propagation slave by default.
diff --git a/include/mounts.h b/include/mounts.h
index a0e60e24..b5a1193b 100644
--- a/include/mounts.h
+++ b/include/mounts.h
@@ -170,6 +170,7 @@ void mnts_put_expire_list(struct list_head *mnts);
void mnts_set_mounted_mount(struct autofs_point *ap, const char *name, unsigned int flags);
struct tree_node *tree_mapent_root(struct mapent *me);
int tree_mapent_add_node(struct mapent_cache *mc, const char *base, const char *key);
+int tree_mapent_delete_offsets(struct mapent_cache *mc, const char *key);
int unlink_mount_tree(struct autofs_point *ap, const char *mp);
void free_mnt_list(struct mnt_list *list);
int is_mounted(const char *mp, unsigned int type);
diff --git a/lib/mounts.c b/lib/mounts.c
index a0bf3d52..eb700c79 100644
--- a/lib/mounts.c
+++ b/lib/mounts.c
@@ -1528,6 +1528,76 @@ int tree_mapent_add_node(struct mapent_cache *mc,
return 1;
}
+static int tree_mapent_delete_offset_tree(struct tree_node *root)
+{
+ struct mapent *me = MAPENT(root);
+ unsigned int logopt = me->mc->ap->logopt;
+ int ret = CHE_OK;
+
+ if (root->left) {
+ ret = tree_mapent_delete_offset_tree(root->left);
+ if (!ret)
+ return 0;
+ root->left = NULL;
+ }
+ if (root->right) {
+ ret = tree_mapent_delete_offset_tree(root->right);
+ if (!ret)
+ return 0;
+ root->right = NULL;
+ }
+
+ /* Keep the owner of the multi-mount offset tree and clear
+ * the root and parent when done.
+ */
+ if (MAPENT_ROOT(me) != MAPENT_NODE(me)) {
+ struct tree_node *root = MAPENT_ROOT(me);
+
+ debug(logopt, "deleting offset key %s", me->key);
+
+ /* cache_delete won't delete an active offset */
+ MAPENT_SET_ROOT(me, NULL);
+ ret = cache_delete(me->mc, me->key);
+ if (ret != CHE_OK) {
+ MAPENT_SET_ROOT(me, root);
+ warn(logopt, "failed to delete offset %s", me->key);
+ }
+ } else {
+ MAPENT_SET_ROOT(me, NULL);
+ MAPENT_SET_PARENT(me, NULL);
+ }
+
+ return ret == CHE_OK ? 1 : 0;
+}
+
+int tree_mapent_delete_offsets(struct mapent_cache *mc, const char *key)
+{
+ unsigned int logopt = mc->ap->logopt;
+ struct mapent *me;
+
+ me = cache_lookup_distinct(mc, key);
+ if (!me) {
+ error(logopt,
+ "failed to find multi-mount root for key %s", key);
+ return 0;
+ }
+
+ /* Not offset list owner */
+ if (MAPENT_ROOT(me) != MAPENT_NODE(me)) {
+ error(logopt,
+ "mapent for key %s is not multi-mount owner", key);
+ return 0;
+ }
+
+ if (!tree_mapent_delete_offset_tree(MAPENT_ROOT(me))) {
+ error(logopt,
+ "could not delete map entry offsets for key %s", key);
+ return 0;
+ }
+
+ return 1;
+}
+
/* From glibc decode_name() */
/* Since the values in a line are separated by spaces, a name cannot
* contain a space. Therefore some programs encode spaces in names