Quoting Oren Laadan (orenl@xxxxxxxxxxxxxxx):
>
> Serge E. Hallyn wrote:
> > Quoting Matt Helsley (matthltc@xxxxxxxxxx):
> >
> > ...
> >
> >> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> >> index a7acfe6..f16be9d 100644
> >> --- a/fs/btrfs/super.c
> >> +++ b/fs/btrfs/super.c
> >> @@ -686,6 +686,7 @@ static const struct file_operations btrfs_ctl_fops = {
> >> .unlocked_ioctl = btrfs_control_ioctl,
> >> .compat_ioctl = btrfs_control_ioctl,
> >> .owner = THIS_MODULE,
> >> + .checkpoint = generic_file_checkpoint,
> >> };
> >
> > Do we really want this one?
>
> We need to checkpoint the open file regardless of whether the underlying
> filesystem has snapshot capabilities.
But maybe we need to refuse a checkpoint if a task is talking to the
underlying btrfs filesystem?
-serge
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