From e3851db2160aa4fa9b9f891dbf27b216a025a1ff Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Thu, 10 Jan 2002 23:29:16 +0000
Subject: [PATCH] Support the renaming of active mapped devices (ioctl
 interface only).

---
 libdm/ioctl/libdevmapper.c  | 28 ++++++++++++++++++++++++++++
 libdm/ioctl/libdm-targets.h |  1 +
 libdm/libdevmapper.h        |  3 +++
 3 files changed, 32 insertions(+)

diff --git a/libdm/ioctl/libdevmapper.c b/libdm/ioctl/libdevmapper.c
index ad005548b..0d39c93c7 100644
--- a/libdm/ioctl/libdevmapper.c
+++ b/libdm/ioctl/libdevmapper.c
@@ -35,6 +35,9 @@ void dm_task_destroy(struct dm_task *dmt)
 		free(t);
 	}
 
+	if (dmt->newname)
+		free(dmt->newname);
+
 	if (dmt->dmi)
 		free(dmt->dmi);
 
@@ -62,6 +65,16 @@ int dm_task_set_ro(struct dm_task *dmt)
 	return 1;
 }
 
+int dm_task_set_newname(struct dm_task *dmt, const char *newname)
+{
+	if (!(dmt->newname = strdup(newname))) {
+		log("dm_task_set_newname: strdup(%s) failed", newname);
+		return 0;
+	}
+
+	return 1;
+}
+
 struct target *create_target(uint64_t start,
 				     uint64_t len,
 				     const char *type, const char *params)
@@ -154,6 +167,14 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
 		count++;
 	}
 
+	if (count && dmt->newname) {
+		log("targets and newname are incompatible");
+		return NULL;
+	}
+
+	if (dmt->newname)
+		len += strlen(dmt->newname) + 1;
+
 	if (!(dmi = malloc(len)))
 		return NULL;
 
@@ -176,6 +197,9 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
 		if (!(b = _add_target(t, b, e)))
 			goto bad;
 
+	if (dmt->newname)
+		strcpy(b, dmt->newname);
+
 	return dmi;
 
  bad:
@@ -227,6 +251,10 @@ int dm_task_run(struct dm_task *dmt)
 		command = DM_INFO;
 		break;
 
+	case DM_DEVICE_RENAME:
+		command = DM_RENAME;
+		break;
+
 	default:
 		log("Internal error: unknown device-mapper task %d",
 		    dmt->type);
diff --git a/libdm/ioctl/libdm-targets.h b/libdm/ioctl/libdm-targets.h
index 72906c317..92433665d 100644
--- a/libdm/ioctl/libdm-targets.h
+++ b/libdm/ioctl/libdm-targets.h
@@ -21,5 +21,6 @@ struct dm_task {
 
 	int read_only;
 	struct dm_ioctl *dmi;
+	char *newname;
 };
 
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index a8dd6c730..67ddba8b2 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -38,6 +38,7 @@ enum {
 	DM_DEVICE_RESUME,
 
 	DM_DEVICE_INFO,
+	DM_DEVICE_RENAME,
 };
 
 
@@ -66,6 +67,8 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
 
 int dm_task_set_ro(struct dm_task *dmt);
 
+int dm_task_set_newname(struct dm_task *dmt, const char *newname);
+
 /*
  * Use these to prepare for a create or reload.
  */