Hugo Mills wrote:
> This patch adds an ioctl for cancelling a btrfs balance operation
> mid-flight. The ioctl simply sets a flag, and the operation terminates
> after the current block group move has completed.
> 

Is there any blocker that prevents us from canceling balance
by just Ctrl+C ?

> Signed-off-by: Hugo Mills <h...@carfax.org.uk>
> ---
>  fs/btrfs/ctree.h   |    1 +
>  fs/btrfs/ioctl.c   |   28 ++++++++++++++++++++++++++++
>  fs/btrfs/ioctl.h   |    3 ++-
>  fs/btrfs/volumes.c |    7 ++++++-
>  4 files changed, 37 insertions(+), 2 deletions(-)
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