mdadm/grow: Component size must be larger than chunk size

Grow: Changing component size must be larger than current
chunk size against stripe raids, otherwise Grow_reshape()
would set s->size to '0'.

Signed-off-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/Grow.c b/Grow.c
index 267b06f7..bab1eec1 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1816,6 +1816,12 @@ int Grow_reshape(char *devname, int fd,
 		return 1;
 	}
 
+	if (array.level > 1 &&
+	   (array.chunk_size / 1024) > (int)s->size) {
+		pr_err("component size must be larger than chunk size.\n");
+		return 1;
+	}
+
 	st = super_by_fd(fd, &subarray);
 	if (!st) {
 		pr_err("Unable to determine metadata format for %s\n", devname);