[PATCH v2 0/1] Add qgroup_autoremove flag

[Sargun Dhillon <sargun@sargun.me>]

This patch makes it so level-0 qgroups are automatically deleted. The
flag that enables this behaviour is persisted in btrfs_qgroup_status_item.
Although, it may make sense to introduce a btrfs_qgroup_configuration_item,
it seems somewhat overkill to do that just for one simple knob that can
fit into the existing flags.

The reason why this is a sysfs knob, and not a mount option is because
qgroups have to be enabled after the first mount. Having to do a mount,
enable qgroups, flip the knob, and then remounting seems somewhat more
awkward than this single sysfs knob.

Changes since v1:
 * Move from mount option to sysfs knob
 * Persist the knob across remounts

Sargun Dhillon (1):
  btrfs: Add mechanism to configure automatic level-0 qgroup removal

 fs/btrfs/ctree.h                |  2 +-
 fs/btrfs/ioctl.c                | 14 +++++++
 fs/btrfs/sysfs.c                | 91 ++++++++++++++++++++++++++++++++++++-----
 include/uapi/linux/btrfs_tree.h |  7 ++++
 4 files changed, 103 insertions(+), 11 deletions(-)

-- 
2.11.0