Report device size correctly in --detail for Large devices.

Signed-off-by: Neil Brown <neilb@suse.de>

2 files changed, 9 insertions, 5 deletions

diff --git a/Detail.c b/Detail.c
index 704fffe..2986a6e 100644
--- a/Detail.c
+++ b/Detail.c
@@ -166,9 +166,13 @@ int Detail(char *dev, int brief, int test)
 			printf("     Array Size : %llu%s\n", (larray_size>>10), human_size(larray_size));
 		if (array.level >= 1) {
 			if (array.major_version != 0 &&
-			    larray_size >= 0xFFFFFFFFULL)
-				printf("    Device Size : unknown\n");
-			else
+			    (larray_size >= 0xFFFFFFFFULL|| array.size == 0)) {
+				unsigned long long dsize = get_component_size(fd);
+				if (dsize > 0)
+					printf("    Device Size : %llu%s\n", dsize, human_size((long long)array.size<<10));
+				else
+					printf("    Device Size : unknown\n");
+			} else
 				printf("    Device Size : %d%s\n", array.size, human_size((long long)array.size<<10));
 		}
 		printf("   Raid Devices : %d\n", array.raid_disks);
diff --git a/util.c b/util.c
index b3dbca4..abc576e 100644
--- a/util.c
+++ b/util.c
@@ -688,10 +688,10 @@ unsigned long long get_component_size(int fd)
 	int n;
 	if (fstat(fd, &stb)) return 0;
 	if (major(stb.st_rdev) == 9)
-		sprintf(fname, "/sys/block/md%d/component_size",
+		sprintf(fname, "/sys/block/md%d/md/component_size",
 			minor(stb.st_rdev));
 	else
-		sprintf(fname, "/sys/block/md_d%d/component_size",
+		sprintf(fname, "/sys/block/md_d%d/md/component_size",
 			minor(stb.st_rdev)/16);
 	fd = open(fname, O_RDONLY);
 	if (fd < 0)