mount.nfs: Add API to duplicate a mount option list

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

2 files changed, 66 insertions, 0 deletions

diff --git a/utils/mount/parse_opt.c b/utils/mount/parse_opt.c
index 1dfee8a..f0918f7 100644
--- a/utils/mount/parse_opt.c
+++ b/utils/mount/parse_opt.c
@@ -101,6 +101,37 @@ fail:
 	return NULL;
 }
 
+static struct mount_option *option_dup(const struct mount_option *option)
+{
+	struct mount_option *new;
+
+	new = malloc(sizeof(*new));
+	if (!new)
+		return NULL;
+	
+	new->next = NULL;
+	new->prev = NULL;
+
+	new->keyword = strdup(option->keyword);
+	if (!new->keyword)
+		goto fail;
+
+	new->value = NULL;
+	if (option->value) {
+		new->value = strdup(option->value);
+		if (!new->value) {
+			free(new->keyword);
+			goto fail;
+		}
+	}
+
+	return new;
+
+fail:
+	free(new);
+	return NULL;
+}
+
 static void option_destroy(struct mount_option *option)
 {
 	free(option->keyword);
@@ -229,6 +260,40 @@ fail:
 }
 
 /**
+ * po_dup - duplicate an existing list of options
+ * @options: pointer to mount options
+ *
+ */
+struct mount_options *po_dup(struct mount_options *source)
+{
+	struct mount_options *target;
+	struct mount_option *current;
+
+	if (!source)
+		return NULL;
+
+	target = options_create();
+	if (options_empty(source) || target == NULL)
+		return target;
+
+	current = source->head;
+	while (target->count < source->count) {
+		struct mount_option *option;
+
+		option = option_dup(current);
+		if (!option) {
+			po_destroy(target);
+			return NULL;
+		}
+
+		options_tail_insert(target, option);
+		current = current->next;
+	}
+
+	return target;
+}
+
+/**
  * po_replace - replace mount options in one mount_options object with another
  * @target: pointer to previously instantiated object to replace
  * @source: pointer to object containing source mount options
diff --git a/utils/mount/parse_opt.h b/utils/mount/parse_opt.h
index f9243c3..2c0b5f4 100644
--- a/utils/mount/parse_opt.h
+++ b/utils/mount/parse_opt.h
@@ -38,6 +38,7 @@ typedef enum {
 struct mount_options;
 
 struct mount_options *	po_split(char *);
+struct mount_options *	po_dup(struct mount_options *);
 void			po_replace(struct mount_options *,
 				   struct mount_options *);
 po_return_t		po_join(struct mount_options *, char **);