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 v3 [1]) and replacing bdrv_get_block_status with a byte based callback in all the drivers (at v1, needs a rebase [3]). Available as a tag at: git fetch git://repo.or.cz/qemu/ericb.git nbd-byte-dirty-v3 Depends on Kevin's block branch and my v3 bdrv_is_allocated [1] Since v2 [2], I had to rebase on top of Paolo's locking fixes; patch v2 2/12 is gone, and many of the others had a lot of context conflicts. But I felt the resolution was simple enough that I kept R-b on all but patch 8. [1] https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg06077.html [2] https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg03859.html [3] https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg02642.html (git backport-diff doesn't like the rename in 7/11) 001/11:[----] [--] 'dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented' 002/11:[0024] [FC] 'dirty-bitmap: Drop unused functions' 003/11:[----] [-C] 'dirty-bitmap: Track size in bytes' 004/11:[----] [-C] 'dirty-bitmap: Set iterator start by offset, not sector' 005/11:[----] [-C] 'dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset' 006/11:[----] [-C] 'dirty-bitmap: Change bdrv_get_dirty_count() to report bytes' 007/11:[down] 'dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes' 008/11:[0036] [FC] 'dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes' 009/11:[----] [--] 'mirror: Switch mirror_dirty_init() to byte-based iteration' 010/11:[0001] [FC] 'dirty-bitmap: Switch bdrv_set_dirty() to bytes' 011/11:[----] [-C] 'dirty-bitmap: Convert internal hbitmap size/granularity' Eric Blake (11): dirty-bitmap: Report BlockDirtyInfo.count in bytes, as documented 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_locked() 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 | 28 ++++-------- block/backup.c | 7 ++- block/dirty-bitmap.c | 105 +++++++++++-------------------------------- block/io.c | 6 +-- block/mirror.c | 73 +++++++++++++----------------- migration/block.c | 12 +++-- 7 files changed, 79 insertions(+), 154 deletions(-) -- 2.9.4