+/*
+ * Pass a message to the target that's at the supplied device offset.
+ */
+static int target_message(struct dm_ioctl *param, size_t param_size)
+{
+ int r, argc;
+ char **argv;
+ struct mapped_device *md;
+ struct dm_table *table;
+ struct dm_target *ti;
+ struct dm_target_msg *tmsg = (void *) param + param->data_start;
+
+ md = find_device(param);
+ if (!md)
+ return -ENXIO;
+
+ r = __dev_status(md, param);
+ if (r)
+ goto out;
+
+ if (tmsg < (struct dm_target_msg *) (param + 1) ||
+ invalid_str(tmsg->message, (void *) param + param_size)) {
+ DMWARN("Invalid target message parameters.");
+ r = -EINVAL;
+ goto out;
+ }
+
+ r = dm_split_args(&argc, &argv, tmsg->message);
+ if (r) {
+ DMWARN("Failed to split target message parameters");
+ goto out;
+ }
+
+ table = dm_get_table(md);
+ if (!table)
+ goto out_argv;
+
+ if (tmsg->sector >= dm_table_get_size(table)) {
+ DMWARN("Target message sector outside device.");
+ r = -EINVAL;
+ goto out_table;
+ }
+
+ ti = dm_table_find_target(table, tmsg->sector);
+ if (ti->type->message)
+ r = ti->type->message(ti, argc, argv);
+ else {
+ DMWARN("Target type does not support messages");
+ r = -EINVAL;
+ }
+
+ out_table:
+ dm_table_put(table);
+ out_argv:
+ kfree(argv);
+ out:
+ param->data_size = 0;
+ dm_put(md);
+ return r;
+}
+