move the setting of use_full_md_check flag

from each command to one location in command init.
No functional change.

tools/lvmcmdline.c

@@ -2766,6 +2766,22 @@ static int _init_lvmlockd(struct cmd_context *cmd)
 	return 1;
 }
 
+static void _init_md_checks(struct cmd_context *cmd)
+{
+	/*
+	 * use_full_md_check can also be set later.
+	 * These commands are chosen to always perform
+	 * a full md component check because they initialize
+	 * a new device that could be an md component,
+	 * and they are not run frequently during normal
+	 * operation.
+	 */
+	if (!strcmp(cmd->name, "pvcreate") ||
+	    !strcmp(cmd->name, "vgcreate") ||
+	    !strcmp(cmd->name, "vgextend"))
+		cmd->use_full_md_check = 1;
+}
+
 static int _cmd_no_meta_proc(struct cmd_context *cmd)
 {
 	return cmd->cname->flags & NO_METADATA_PROCESSING;
@@ -2979,6 +2995,8 @@ int lvm_run_command(struct cmd_context *cmd, int argc, char **argv)
 		}
 	}
 
+	_init_md_checks(cmd);
+
 	if (!_cmd_no_meta_proc(cmd) && !_init_lvmlockd(cmd)) {
 		ret = ECMD_FAILED;
 		goto_out;

tools/pvcreate.c

@@ -136,9 +136,6 @@ int pvcreate(struct cmd_context *cmd, int argc, char **argv)
 	pp.pv_count = argc;
 	pp.pv_names = argv;
 
-	/* Check for old md signatures at the end of devices. */
-	cmd->use_full_md_check = 1;
-
 	/* Needed to change the set of orphan PVs. */
 	if (!lock_global(cmd, "ex"))
 		return_ECMD_FAILED;

tools/vgcreate.c

@@ -63,9 +63,6 @@ int vgcreate(struct cmd_context *cmd, int argc, char **argv)
 
 	clear_hint_file(cmd);
 
-	/* Check for old md signatures at the end of devices. */
-	cmd->use_full_md_check = 1;
-
 	/*
 	 * Check if the VG name already exists.  This should be done before
 	 * creating PVs on any of the devices.

tools/vgextend.c

@@ -154,9 +154,6 @@ int vgextend(struct cmd_context *cmd, int argc, char **argv)
 	/* pvcreate within vgextend cannot be forced. */
 	pp->force = 0;
 
-	/* Check for old md signatures at the end of devices. */
-	cmd->use_full_md_check = 1;
-
 	if (!lock_global(cmd, "ex"))
 		return_ECMD_FAILED;