md: Disable bad blocks and v0.90 metadata.

v0.90 metadata cannot record bad blocks, so when loading metadata
for such a device, set shift to -1.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index e2ec8bd..7ae3c5a 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1058,6 +1058,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
        rdev->preferred_minor = sb->md_minor;
        rdev->data_offset = 0;
        rdev->sb_size = MD_SB_BYTES;
+       rdev->badblocks.shift = -1;
 
        if (sb->level == LEVEL_MULTIPATH)
                rdev->desc_nr = -1;
@@ -3004,6 +3005,9 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
                        goto abort_free;
                }
        }
+       if (super_format == -1)
+               /* hot-add for 0.90, or non-persistent: so no badblocks */
+               rdev->badblocks.shift = -1;
 
        return rdev;