Hello,

This is the kernel side of the global roots and block group root support.  The
motivation for this change is described in the progs patches.  The important
part here is I've disabled qgroups and balance for now, this support will be
added back later.  I've also changed global block rsv size calculation, but it's
exactly the same result for !EXTENT_TREE_V2.  And finally there's the support
for loading the roots.  This doesn't panic and doesn't introduce any performance
regressions.  I've also hidden the support behind CONFIG_BTRFS_DEBUG so it
doesn't get used accidentally.  Thanks,

Josef

Josef Bacik (8):
  btrfs: add definition for EXTENT_TREE_V2
  btrfs: disable balance for extent tree v2 for now
  btrfs: disable qgroups in extent tree v2
  btrfs: use metadata usage for global block rsv in extent tree v2
  btrfs: tree-checker: don't fail on empty extent roots for extent tree
    v2
  btrfs: abstract out loading the tree root
  btrfs: add code to support the block group root
  btrfs: add support for multiple global roots

 fs/btrfs/block-group.c          |  11 +-
 fs/btrfs/block-group.h          |   1 +
 fs/btrfs/block-rsv.c            |  16 +--
 fs/btrfs/ctree.h                |  46 ++++++++-
 fs/btrfs/disk-io.c              | 178 +++++++++++++++++++++++---------
 fs/btrfs/disk-io.h              |   2 +
 fs/btrfs/free-space-tree.c      |   2 +
 fs/btrfs/print-tree.c           |   1 +
 fs/btrfs/qgroup.c               |   6 ++
 fs/btrfs/sysfs.c                |   5 +-
 fs/btrfs/transaction.c          |  15 +++
 fs/btrfs/tree-checker.c         |  35 ++++++-
 fs/btrfs/volumes.c              |   6 ++
 include/trace/events/btrfs.h    |   1 +
 include/uapi/linux/btrfs.h      |   1 +
 include/uapi/linux/btrfs_tree.h |   3 +
 16 files changed, 266 insertions(+), 63 deletions(-)

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2.26.3