Setting FS_USERNS_MOUNT in btrfs_fs_type.fs_flags

[Shea Levy]

Hi all,

What work would be required to mark btrfs_fs_type with FS_USERNS_MOUNT
so that btrfs images can be mounted by unprivileged users within a user
namespace (along with something like [1])? I'd like to be able to create
disk images without having to start a VM (and --rootdir isn't flexible
enough because I want to make subvolumes).

Cheers,
Shea Levy

P.S. I am not subscribed to either list, please CC me in replies

[1] https://lkml.org/lkml/2014/5/27/690
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