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>

3 files changed, 22 insertions, 0 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 3cbf0ac2aaad..8db311d7cddc 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1055,6 +1055,9 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
         if (mddev->recovery_disabled == conf->recovery_disabled)
                 return -EBUSY;
 
+        if (rdev->badblocks.count)
+                return -EINVAL;
+
         if (rdev->raid_disk >= 0)
                 first = last = rdev->raid_disk;
 
@@ -1994,6 +1997,10 @@ static int run(mddev_t *mddev)
                         blk_queue_segment_boundary(mddev->queue,
                                                    PAGE_CACHE_SIZE - 1);
                 }
+                if (rdev->badblocks.count) {
+                        printk(KERN_ERR "md/raid1: Cannot handle bad blocks yet\n");
+                        return -EINVAL;
+                }
         }
 
         mddev->degraded = 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 5def27c28be7..8aadd2f52dc8 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1101,6 +1101,9 @@ static int raid10_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 (mddev->recovery_cp < MaxSector)
                 /* only hot-add to in-sync arrays, as recovery is
                  * very different from resync
@@ -2263,6 +2266,11 @@ static int run(mddev_t *mddev)
                                  (conf->raid_disks / conf->near_copies));
 
         list_for_each_entry(rdev, &mddev->disks, same_set) {
+
+                if (rdev->badblocks.count) {
+                        printk(KERN_ERR "md/raid10: cannot handle bad blocks yet\n");
+                        goto out_free_conf;
+                }
                 disk_idx = rdev->raid_disk;
                 if (disk_idx >= conf->raid_disks
                     || disk_idx < 0)
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;