On Wed, May 16, 2018 at 05:09:27PM +0900, Tomohiro Misono wrote:
> Deletion of a subvolume by rmdir(2) has become allowed by the
> 'commit cd2decf640b1 ("btrfs: Allow rmdir(2) to delete an empty
> subvolume")'.
>
> It is a kind of new feature and this commits add a sysfs entry
> /sys/fs/btrfs/static_features/rmdir_subvol
> to indicate the availability of feature so that a user program
> (e.g. xfstests) can detect it.
>
> Note that new sysfs directory "static_features" is created since a entry
> in /sys/fs/btrfs/features depends on feature bits of superblock (in other
> words, they may be different between each fs) and is not suitable to hold
> the features which only depend on kernel version. New attribute_group
> "btrfs_static_feature_attr_group" is created for this purpose.
No, we don't want to add another directory for that, please use
'/sys/fs/btrfs/features'. Listing in this directory reflects
capabilities of the kernel module, the filesystem specific features are
in the /sys/fs/btrfs/UUID/features directory.
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