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disk/partfs: adding identical partition is no-op

--- a/sys/src/cmd/disk/partfs.c

+++ b/sys/src/cmd/disk/partfs.c

@@ -69,6 +69,9 @@

 	}

 	for (p = tab; p < tab + nelem(tab); p++)

 		if (p->inuse && strcmp(p->name, name) == 0) {

+			/* adding identical partition is no-op */

+			if(p->offset == start && p->length == end - start)

+				return 0;

 			werrstr("partition name already in use");

 			return -1;

 		}