There are patches floating around to add NBD_CMD_BLOCK_STATUS,
but NBD wants to report status on byte granularity (even if the
reporting will probably be naturally aligned to sectors or even
much higher levels).  I've therefore started the task of
converting our block status code to report at a byte granularity
rather than sectors.

This is part two of that conversion: dirty-bitmap. Other parts
include bdrv_is_allocated (at v2 [1]) and replacing
bdrv_get_block_status with a byte based callback in all the
drivers (at v1, needs a rebase [2]).

Available as a tag at:
git fetch git://repo.or.cz/qemu/ericb.git nbd-byte-dirty-v2

No change to the code itself since v1 [3], just tweaking commit
messages and adding John's Reviewed-by tags, and making sure it
still rebases cleanly on top of Max's block branch.

[1] https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg02573.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg02642.html
[3] https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg02163.html

Eric Blake (12):
  dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented
  migration: Don't lose errno across aio context changes
  dirty-bitmap: Drop unused functions
  dirty-bitmap: Track size in bytes
  dirty-bitmap: Set iterator start by offset, not sector
  dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset
  dirty-bitmap: Change bdrv_get_dirty_count() to report bytes
  dirty-bitmap: Change bdrv_get_dirty() to take bytes
  dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes
  mirror: Switch mirror_dirty_init() to byte-based iteration
  dirty-bitmap: Switch bdrv_set_dirty() to bytes
  dirty-bitmap: Convert internal hbitmap size/granularity

 include/block/block_int.h    |  2 +-
 include/block/dirty-bitmap.h | 21 ++++-------
 block/backup.c               |  7 ++--
 block/dirty-bitmap.c         | 83 ++++++++++++--------------------------------
 block/io.c                   |  6 ++--
 block/mirror.c               | 73 +++++++++++++++++---------------------
 migration/block.c            | 14 ++++----
 7 files changed, 74 insertions(+), 132 deletions(-)

-- 
2.9.4