1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index f84c08029b21..9fb18c147825 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -368,8 +368,17 @@ static int flakey_status(struct dm_target *ti, status_type_t type,
 static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
 {
         struct flakey_c *fc = ti->private;
+        struct dm_dev *dev = fc->dev;
+        int r = 0;
 
-        return __blkdev_driver_ioctl(fc->dev->bdev, fc->dev->mode, cmd, arg);
+        /*
+         * Only pass ioctls through if the device sizes match exactly.
+         */
+        if (fc->start ||
+            ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
+                r = scsi_verify_blk_ioctl(NULL, cmd);
+
+        return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
 }
 
 static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm,