md/raid1: fail run raid1 array when active disk less than one

When run test case:
  mdadm -CR /dev/md1 -l 1 -n 4 /dev/sd[a-d] --assume-clean --bitmap=internal
  mdadm -S /dev/md1
  mdadm -A /dev/md1 /dev/sd[b-c] --run --force

  mdadm --zero /dev/sda
  mdadm /dev/md1 -a /dev/sda

  echo offline > /sys/block/sdc/device/state
  echo offline > /sys/block/sdb/device/state
  sleep 5
  mdadm -S /dev/md1

  echo running > /sys/block/sdb/device/state
  echo running > /sys/block/sdc/device/state
  mdadm -A /dev/md1 /dev/sd[a-c] --run --force

mdadm run fail with kernel message as follow:
[  172.986064] md: kicking non-fresh sdb from array!
[  173.004210] md: kicking non-fresh sdc from array!
[  173.022383] md/raid1:md1: active with 0 out of 4 mirrors
[  173.022406] md1: failed to create bitmap (-5)

In fact, when active disk in raid1 array less than one, we
need to return fail in raid1_run().

Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 6ea4f2679b78..0466ee2453b4 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -3129,6 +3129,13 @@ static int raid1_run(struct mddev *mddev)
                     !test_bit(In_sync, &conf->mirrors[i].rdev->flags) ||
                     test_bit(Faulty, &conf->mirrors[i].rdev->flags))
                         mddev->degraded++;
+        /*
+         * RAID1 needs at least one disk in active
+         */
+        if (conf->raid_disks - mddev->degraded < 1) {
+                ret = -EINVAL;
+                goto abort;
+        }
 
         if (conf->raid_disks - mddev->degraded == 1)
                 mddev->recovery_cp = MaxSector;
@@ -3162,8 +3169,12 @@ static int raid1_run(struct mddev *mddev)
         ret = md_integrity_register(mddev);
         if (ret) {
                 md_unregister_thread(&mddev->thread);
-                raid1_free(mddev, conf);
+                goto abort;
         }
+        return 0;
+
+abort:
+        raid1_free(mddev, conf);
         return ret;
 }