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authorMisono Tomohiro <misono.tomohiro@jp.fujitsu.com>2018-05-17 14:24:51 +0900
committerDavid Sterba <dsterba@suse.com>2018-05-28 18:23:41 +0200
commitf902bd3a5e19284698ce6d70209d316df15116c6 (patch)
tree77f138364506df9239eb71f990d9cdc37739ee17 /fs/btrfs/delayed-ref.h
parent6c52157fa9378efc0ff24c5f2602d500997f59db (diff)
btrfs: sysfs: Add entry which shows if rmdir can work on subvolumes
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/features/rmdir_subvol to indicate the availability of the feature so that a user program (e.g. fstests) can detect it. Prior to this commit, all entries in /sys/fs/btrfs/features are feature which depend on feature bits of superblock (i.e. each feature affects on-disk format) and managed by attribute_group "btrfs_feature_attr_group". For each fs, entries in /sys/fs/btrfs/UUID/features indicate which features are enabled (or can be changed online) for the fs. However, rmdir_subvol feature only depends on kernel module. Therefore new attribute_group "btrfs_static_feature_attr_group" is introduced and sysfs_merge_group() is used to share /sys/fs/btrfs/features directory. Features in "btrfs_static_feature_attr_group" won't be listed in each /sys/fs/btrfs/UUID/features. Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/delayed-ref.h')
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