Re: Ideas to do custom operation just after mount?

Dave Chinner
2015-12-23T23:18:34Z

On Mon, Dec 21, 2015 at 01:18:22PM +0800, Anand Jain wrote:
>
>
> >BTW, any good idea for btrfs to do such operation like
> >enabling/disabling some minor features? Especially when it can be set on
> >individual file/dirs.
> >
> >Features like incoming write time deduplication, is designed to be
> >enabled/disabled for individual file/dirs, so it's not a quite good idea
> >to use mount option to do it.
> >
> >Although some feature, like btrfs quota(qgroup), should be implemented
> >by mount option though.
> >I don't understand why qgroup is enabled/disabled by ioctl. :(
>
>
> mount option won't persist across systems/computers unless
> remembered by human.

So record the mount option you want persistent in the filesystem at
mount time and don't turn it off until a "no-...." mount option is
provided at mount time.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com