If cache support is enabled, don't allow resize/reshape in current
stage. In the future, we can flush all data from cache to raid before
resize/reshape and then allow resize/reshape.

Signed-off-by: Shaohua Li <redacted>
---
 drivers/md/raid5.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 26561d8..29f49c7 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c

@@ -7207,6 +7207,10 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	 * worth it.
 	 */
 	sector_t newsize;
+	struct r5conf *conf = mddev->private;
+
+	if (conf->cache)
+		return -EINVAL;
 	sectors &= ~((sector_t)mddev->chunk_sectors - 1);
 	newsize = raid5_size(mddev, sectors, mddev->raid_disks);
 	if (mddev->external_size &&

@@ -7258,6 +7262,8 @@ static int check_reshape(struct mddev *mddev)
 {
 	struct r5conf *conf = mddev->private;
 
+	if (conf->cache)
+		return -EINVAL;
 	if (mddev->delta_disks == 0 &&
 	    mddev->new_layout == mddev->layout &&
 	    mddev->new_chunk_sectors == mddev->chunk_sectors)