[GIT PULL] Btrfs fixes for 5.5-rc7

[David Sterba]

Hi,

please pull a few more fixes that have been in the works during last 2
weeks.  All have a user visible effect and are stable material. Thanks.

* scrub: properly update progress after calling cancel ioctl, calling
  'resume' would start from the beginning otherwise

* fix subvolume reference removal, after moving out of the original path
  the reference is not recognized and will lead to transaction abort

* fix reloc root lifetime checks, could lead to crashes when there's
  subvolume cleaning running in parallel

* fix memory leak when quotas get disabled in the middle of extent
  accounting

* fix transaction abort in case of balance being started on degraded mount
  on eg. RAID1

----------------------------------------------------------------
The following changes since commit de7999afedff02c6631feab3ea726a0e8f8c3d40:

  Btrfs: fix infinite loop during nocow writeback due to race (2019-12-30 16:13:20 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-5.5-rc6-tag

for you to fetch changes up to b35cf1f0bf1f2b0b193093338414b9bd63b29015:

  btrfs: check rw_devices, not num_devices for balance (2020-01-17 15:40:54 +0100)

----------------------------------------------------------------
Filipe Manana (1):
      Btrfs: always copy scrub arguments back to user space

Johannes Thumshirn (1):
      btrfs: fix memory leak in qgroup accounting

Josef Bacik (4):
      btrfs: rework arguments of btrfs_unlink_subvol
      btrfs: fix invalid removal of root ref
      btrfs: do not delete mismatched root refs
      btrfs: check rw_devices, not num_devices for balance

Qu Wenruo (1):
      btrfs: relocation: fix reloc_root lifespan and access

 fs/btrfs/inode.c      | 73 +++++++++++++++++++++++++++------------------------
 fs/btrfs/ioctl.c      | 14 +++++++++-
 fs/btrfs/qgroup.c     |  6 ++++-
 fs/btrfs/relocation.c | 51 +++++++++++++++++++++++++++++++----
 fs/btrfs/root-tree.c  | 10 ++++---
 fs/btrfs/volumes.c    |  6 ++++-
 6 files changed, 114 insertions(+), 46 deletions(-)