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
