md: fix two bugs when attempting to resize RAID0 array.

You cannot resize a RAID0 array (in terms of making the devices
bigger), but the code doesn't entirely stop you.
So:

 disable setting of the available size on each device for
 RAID0 and Linear devices.  This must not change as doing so
 can change the effective layout of data.

 Make sure that the size that raid0_size() reports is accurate,
 but rounding devices sizes to chunk sizes.  As the device sizes
 cannot change now, this isn't so important, but it is best to be
 safe.

Without this change:
  mdadm --grow /dev/md0 -z max
  mdadm --grow /dev/md0 -Z max
  then read to the end of the array

can cause a BUG in a RAID0 array.

These bugs have been present ever since it became possible
to resize any device, which is a long time.  So the fix is
suitable for any -stable kerenl.

Cc: stable@vger.kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1e634a68541e..f363135144f6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2998,6 +2998,9 @@ rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
                 } else if (!sectors)
                         sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
                                 rdev->data_offset;
+                if (!my_mddev->pers->resize)
+                        /* Cannot change size for RAID0 or Linear etc */
+                        return -EINVAL;
         }
         if (sectors < my_mddev->dev_sectors)
                 return -EINVAL; /* component must fit device */