parse_size: distinguish between 0 and error.

It isn't sufficient to use '0' for 'error' as well will
later have fields that can validly be '0'.

So return "-1" on error.

Also fix parsing of --bitmap_check so that '0' is treated
as an error: we don't support 512B anyway.

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

2 files changed, 4 insertions, 4 deletions

diff --git a/mdadm.c b/mdadm.c
index 1efa3e8..4d4820d 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1056,15 +1056,14 @@ int main(int argc, char *argv[])
 		case O(BUILD,BitmapChunk):
 		case O(CREATE,BitmapChunk): /* bitmap chunksize */
 			bitmap_chunk = parse_size(optarg);
-			if (bitmap_chunk < 0 ||
+			if (bitmap_chunk <= 0 ||
 			    bitmap_chunk & (bitmap_chunk - 1)) {
 				fprintf(stderr,
 					Name ": invalid bitmap chunksize: %s\n",
 					optarg);
 				exit(2);
 			}
-			/* convert sectors to B, chunk of 0 means 512B */
-			bitmap_chunk = bitmap_chunk ? bitmap_chunk * 512 : 512;
+			bitmap_chunk = bitmap_chunk * 512;
 			continue;
 
 		case O(GROW, WriteBehind):
diff --git a/util.c b/util.c
index d32e650..b942058 100644
--- a/util.c
+++ b/util.c
@@ -194,6 +194,7 @@ long long parse_size(char *size)
 	 * followed by 'K', 'M', or 'G'.
 	 * Without a suffix, K is assumed.
 	 * Number returned is in sectors (half-K)
+	 * -1 returned on error.
 	 */
 	char *c;
 	long long s = strtoll(size, &c, 10);
@@ -215,7 +216,7 @@ long long parse_size(char *size)
 		}
 	}
 	if (*c)
-		s = 0;
+		s = -1;
 	return s;
 }