Add --type to lvcreate/resize.

Add virtual segment types, zero and error.

A large sparse device can be constructed as a writeable snapshot of a large
zero device.

1 files changed, 101 insertions, 0 deletions

diff --git a/lib/error/errseg.c b/lib/error/errseg.c
new file mode 100644
index 000000000..e0310e56c
--- /dev/null
+++ b/lib/error/errseg.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of LVM2.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "lib.h"
+#include "pool.h"
+#include "list.h"
+#include "toolcontext.h"
+#include "segtypes.h"
+#include "display.h"
+#include "text_export.h"
+#include "text_import.h"
+#include "config.h"
+#include "str_list.h"
+#include "targets.h"
+#include "lvm-string.h"
+#include "activate.h"
+
+static const char *_name(const struct lv_segment *seg)
+{
+	return seg->segtype->name;
+}
+
+static int _merge_segments(struct lv_segment *seg1, struct lv_segment *seg2)
+{
+	seg1->len += seg2->len;
+	seg1->area_len += seg2->area_len;
+
+	return 1;
+}
+
+#ifdef DEVMAPPER_SUPPORT
+static int _compose_target_line(struct dev_manager *dm, struct pool *mem,
+				struct config_tree *cft, void **target_state,
+				struct lv_segment *seg, char *params,
+				size_t paramsize, const char **target, int *pos,
+				uint32_t *pvmove_mirror_count)
+{
+	/*   error */
+
+	*target = "error";
+	*params = '\0';
+
+	return 1;
+}
+
+static int _target_present(void)
+{
+	static int checked = 0;
+	static int present = 0;
+
+	if (!checked)
+		present = target_present("error");
+
+	checked = 1;
+	return present;
+}
+#endif
+
+static void _destroy(const struct segment_type *segtype)
+{
+	dbg_free((void *) segtype);
+}
+
+static struct segtype_handler _error_ops = {
+	name:_name,
+	merge_segments:_merge_segments,
+#ifdef DEVMAPPER_SUPPORT
+	compose_target_line:_compose_target_line,
+	target_present:_target_present,
+#endif
+	destroy:_destroy,
+};
+
+struct segment_type *init_error_segtype(struct cmd_context *cmd)
+{
+	struct segment_type *segtype = dbg_malloc(sizeof(*segtype));
+
+	if (!segtype) {
+		stack;
+		return NULL;
+	}
+
+	segtype->cmd = cmd;
+	segtype->ops = &_error_ops;
+	segtype->name = "error";
+	segtype->private = NULL;
+	segtype->flags = SEG_CAN_SPLIT | SEG_VIRTUAL;
+
+	return segtype;
+}