Description of problem:
The `cryptsetup luksClose $somedevice` writes the following errors when it is called directly after a `mkfs.btrfs $somedevice` command.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. cryptsetup luksFormat /dev/disk/by-id/usb-$usbtestdrive && cryptsetup luksOpen /dev/disk/by-id/usb-$usbtestdrive backup && mkfs.btrfs /dev/mapper/backup && sync && cryptsetup luksClose backup
device-mapper: remove ioctl on backup failed: Device or resource busy
kernel: device-mapper: ioctl: unable to remove open device backup
$ echo $?
no such error messages
and/or if there is really a serious error: echo $? != 0
I can work around this via adding a sleep between the mkfs and luksClose call, i.e.:
$ cryptsetup luksFormat /dev/disk/by-id/usb-$usbtestdrive && cryptsetup luksOpen /dev/disk/by-id/usb-$usbtestdrive backup && mkfs.btrfs /dev/mapper/backup && sync && sleep 1 && cryptsetup luksClose backup
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