Return EBUSY from BLKRRPART for mounted whole-dev fs

Today, blockdev --rereadpt /dev/sda will fail with EBUSY if any
partition of sda is mounted (and will fail with EINVAL if pointed
at a partition).  But it will pass if the entire block device is
formatted with a filesystem and mounted.  I don't think this makes
sense; partitioning should surely not ever change out from under
a mounted device.

So check for bdev->bd_super, and fail that with -EBUSY as well.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/partition-generic.c b/block/partition-generic.c
index 3b030157ec85..746935a5973c 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -397,7 +397,7 @@ static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
         struct hd_struct *part;
         int res;
 
-        if (bdev->bd_part_count)
+        if (bdev->bd_part_count || bdev->bd_super)
                 return -EBUSY;
         res = invalidate_partition(disk, 0);
         if (res)