Grow: Allow for component_size not being set for RAID0 arrays.

When an RAID0 is started using SET_ARRAY_INFO ioctl the
component_size will be zero.
This confused the code for reshaping a RAID0 via RAID4.

So if that seems to be the case, fake a believable component_size

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

1 files changed, 12 insertions, 4 deletions

diff --git a/Grow.c b/Grow.c
index d596c2d..812c1da 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1649,6 +1649,18 @@ static int reshape_array(char *container, int fd, char *devname,
 	int done;
 	struct mdinfo *sra = NULL;
 
+	/* when reshaping a RAID0, the component_size might be zero.
+	 * So try to fix that up.
+	 */
+	if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
+		dprintf("Cannot get array information.\n");
+		goto release;
+	}
+	if (array.level == 0 && info->component_size == 0) {
+		get_dev_size(fd, NULL, &array_size);
+		info->component_size = array_size / array.raid_disks;
+	}
+
 	if (info->reshape_active) {
 		int new_level = info->new_level;
 		info->new_level = UnSet;
@@ -1671,10 +1683,6 @@ static int reshape_array(char *container, int fd, char *devname,
 			" cannot continue.\n");
 		goto release;
 	}
-	if (ioctl(fd, GET_ARRAY_INFO, &array) != 0) {
-		dprintf("Cannot get array information.\n");
-		goto release;
-	}
 
 	if (restart) {
 		/* reshape already started. just skip to monitoring the reshape */