ext4: status extents

This set is based on the earlier delayed extent tree, but has
been renamed to a "status extent" scheme.  The plan is that the
tree will be expanded to track allocated extents and also
support extent locks.  Thus status extents seemed like a
more appropriate name.

Allison Henderson (6):
  ext4: add two structures supporting status extent tree
  ext4: add operations on status extent tree
  ext4: initialize status extent tree
  ext4: let ext4 maintian status extent trees
  ext4: reimplement fiemap on status extent tree
  ext4: reimplement ext4_find_delay_alloc_range on status extent tree

 fs/ext4/Makefile         |    2 +-
 fs/ext4/ext4.h           |    9 +-
 fs/ext4/ext4_extents.h   |    3 +-
 fs/ext4/extents.c        |  297 ++++-----------------------------
 fs/ext4/indirect.c       |    3 +
 fs/ext4/inode.c          |   83 ++++------
 fs/ext4/status_extents.c |  417 ++++++++++++++++++++++++++++++++++++++++++++++
 fs/ext4/status_extents.h |   40 +++++
 fs/ext4/super.c          |   13 ++-
 9 files changed, 545 insertions(+), 322 deletions(-)
 create mode 100644 fs/ext4/status_extents.c
 create mode 100644 fs/ext4/status_extents.h

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