md: allow array to be resized while bitmap is present.

Now that bitmaps can be resized, we can allow an array to be resized
while the bitmap is present.

This only covers resizing that involves changing the effective size
of member devices, not resizing that changes the number of devices.

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

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7bfd59b313d7..eab6168bb7f4 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5503,12 +5503,18 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
          * any io in the removed space completes, but it hardly seems
          * worth it.
          */
+        sector_t newsize;
         sectors &= ~((sector_t)mddev->chunk_sectors - 1);
-        md_set_array_sectors(mddev, raid5_size(mddev, sectors,
-                                               mddev->raid_disks));
-        if (mddev->array_sectors >
-            raid5_size(mddev, sectors, mddev->raid_disks))
+        newsize = raid5_size(mddev, sectors, mddev->raid_disks);
+        if (mddev->external_size &&
+            mddev->array_sectors > newsize)
                 return -EINVAL;
+        if (mddev->bitmap) {
+                int ret = bitmap_resize(mddev->bitmap, sectors, 0, 0);
+                if (ret)
+                        return ret;
+        }
+        md_set_array_sectors(mddev, newsize);
         set_capacity(mddev->gendisk, mddev->array_sectors);
         revalidate_disk(mddev->gendisk);
         if (sectors > mddev->dev_sectors &&