Support fixing of byte-swapped superblocks.

Good for moving between little-endian and big-endian.
Still needs documentation.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>

1 files changed, 14 insertions, 0 deletions

diff --git a/mdadm.c b/mdadm.c
index 45c59b3..2b2b9be 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -547,6 +547,20 @@ int main(int argc, char *argv[])
 				continue;
 			if (strcmp(update, "resync")==0)
 				continue;
+			if (strcmp(update, "byteorder")==0) {
+				if (ss) {
+					fprintf(stderr, Name ": must not set metadata type with --update=byteorder.\n");
+					exit(2);
+				}
+				for(i=0; !ss && superlist[i]; i++) 
+					ss = superlist[i]->match_metadata_desc("0.swap");
+				if (!ss) {
+					fprintf(stderr, Name ": INTERNAL ERROR cannot find 0.swap\n");
+					exit(2);
+				}
+
+				continue;
+			}
 			fprintf(stderr, Name ": '--update %s' invalid.  Only 'sparc2.2', 'super-minor', 'resync' or 'summaries' supported\n",update);
 			exit(2);