md: don't allow arrays to contain devices with bad blocks.

As no personality understand bad block lists yet, we must
reject any device that is known to contain bad blocks.
As the personalities get taught, these tests can be removed.

This only applies to raid1/raid5/raid10.
For linear/raid0/multipath/faulty the whole concept of bad blocks
doesn't mean anything so there is no point adding the checks.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b874f42694e2..719445004dd9 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4667,6 +4667,10 @@ static int run(mddev_t *mddev)
          * 0 for a fully functional array, 1 or 2 for a degraded array.
          */
         list_for_each_entry(rdev, &mddev->disks, same_set) {
+                if (rdev->badblocks.count) {
+                        printk(KERN_ERR "md/raid5: cannot handle bad blocks yet\n");
+                        goto abort;
+                }
                 if (rdev->raid_disk < 0)
                         continue;
                 if (test_bit(In_sync, &rdev->flags)) {
@@ -4975,6 +4979,9 @@ static int raid5_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
         int first = 0;
         int last = conf->raid_disks - 1;
 
+        if (rdev->badblocks.count)
+                return -EINVAL;
+
         if (has_failed(conf))
                 /* no point adding a device */
                 return -EINVAL;