[thin_check] Add support for --metadata-snap.

Not tested yet.

thin-provisioning/thin_check.cc

@@ -109,15 +109,16 @@ thin_check_cmd::thin_check_cmd()
 void
 thin_check_cmd::usage(std::ostream &out) const
 {
-	out << "Usage: " << get_name() << " [options] {device|file}" << endl
-	    << "Options:" << endl
-	    << "  {-q|--quiet}" << endl
-	    << "  {-h|--help}" << endl
-	    << "  {-V|--version}" << endl
-	    << "  {--override-mapping-root}" << endl
-	    << "  {--clear-needs-check-flag}" << endl
-	    << "  {--ignore-non-fatal-errors}" << endl
-	    << "  {--skip-mappings}" << endl
+	out << "Usage: " << get_name() << " [options] {device|file}\n"
+	    << "Options:\n"
+	    << "  {-q|--quiet}\n"
+	    << "  {-h|--help}\n"
+	    << "  {-V|--version}\n"
+	    << "  {-m|--metadata-snap}\n"
+	    << "  {--override-mapping-root}\n"
+	    << "  {--clear-needs-check-flag}\n"
+	    << "  {--ignore-non-fatal-errors}\n"
+	    << "  {--skip-mappings}\n"
 	    << "  {--super-block-only}" << endl;
 }
 
@@ -132,6 +133,7 @@ thin_check_cmd::run(int argc, char **argv)
 		{ "quiet", no_argument, NULL, 'q'},
 		{ "help", no_argument, NULL, 'h'},
 		{ "version", no_argument, NULL, 'V'},
+		{ "metadata-snap", no_argument, NULL, 'm'},
 		{ "super-block-only", no_argument, NULL, 1},
 		{ "skip-mappings", no_argument, NULL, 2},
 		{ "ignore-non-fatal-errors", no_argument, NULL, 3},
@@ -154,6 +156,10 @@ thin_check_cmd::run(int argc, char **argv)
 			cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
 			return 0;
 
+		case 'm':
+			fs.check_opts.set_metadata_snap();
+			break;
+
 		case 1:
 			// super-block-only
 			fs.check_opts.set_superblock_only();
@@ -185,6 +191,12 @@ thin_check_cmd::run(int argc, char **argv)
 		}
 	}
 
+	if (fs.clear_needs_check_flag_on_success && fs.check_opts.use_metadata_snap_) {
+		cerr << "--metadata-snap cannot be combined with --clear-needs-check-flag.";
+		usage(cerr);
+		exit(1);
+	}
+
 	if (argc == optind) {
 		if (!fs.quiet) {
 			cerr << "No input file provided." << endl;