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.
Now that 2.11 is open, I'm rebasing/reposting the remaining patches. The overall conversion currently looks like: part 1: bdrv_is_allocated (merged in 2.10, commit 51b0a488) part 2: dirty-bitmap (this series, v5 was here [1]) part 3: bdrv_get_block_status (v3 is posted [2] and is mostly reviewed, but needs a rebase) part 4: .bdrv_co_block_status (v2 is posted [3], but needs a rebase) Available as a tag at: git fetch git://repo.or.cz/qemu/ericb.git nbd-byte-dirty-v6 [1] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg03512.html [2] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg03853.html [3] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg04370.html Diff from v5: - add another patch (more for ease of bookkeeping, as it was previously posted independently) - drop bug fixes that were hoisted into 2.10 (v5 1/18, plus 14/18) 001/18:[down] 'block: Make bdrv_img_create() size selection easier to read' 002/18:[----] [--] 'hbitmap: Rename serialization_granularity to serialization_align' 003/18:[----] [--] 'qcow2: Ensure bitmap serialization is aligned' 004/18:[----] [--] 'dirty-bitmap: Drop unused functions' 005/18:[----] [--] 'dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes' 006/18:[----] [--] 'dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes' 007/18:[----] [--] 'qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based' 008/18:[----] [--] 'dirty-bitmap: Set iterator start by offset, not sector' 009/18:[----] [--] 'dirty-bitmap: Change bdrv_dirty_iter_next() to report byte offset' 010/18:[----] [--] 'dirty-bitmap: Change bdrv_get_dirty_count() to report bytes' 011/18:[----] [--] 'dirty-bitmap: Change bdrv_get_dirty_locked() to take bytes' 012/18:[----] [--] 'dirty-bitmap: Change bdrv_[re]set_dirty_bitmap() to use bytes' 013/18:[----] [--] 'mirror: Switch mirror_dirty_init() to byte-based iteration' 014/18:[0004] [FC] 'qcow2: Switch qcow2_measure() to byte-based iteration' 015/18:[----] [--] 'qcow2: Switch load_bitmap_data() to byte-based iteration' 016/18:[----] [--] 'qcow2: Switch store_bitmap_data() to byte-based iteration' 017/18:[----] [--] 'dirty-bitmap: Switch bdrv_set_dirty() to bytes' 018/18:[----] [--] 'dirty-bitmap: Convert internal hbitmap size/granularity' Eric Blake (18): block: Make bdrv_img_create() size selection easier to read hbitmap: Rename serialization_granularity to serialization_align qcow2: Ensure bitmap serialization is aligned dirty-bitmap: Drop unused functions dirty-bitmap: Change bdrv_dirty_bitmap_size() to report bytes dirty-bitmap: Change bdrv_dirty_bitmap_*serialize*() to take bytes qcow2: Switch sectors_covered_by_bitmap_cluster() to byte-based 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 qcow2: Switch qcow2_measure() to byte-based iteration qcow2: Switch load_bitmap_data() to byte-based iteration qcow2: Switch store_bitmap_data() 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 | 41 +++++--------- include/qemu/hbitmap.h | 8 +-- block/io.c | 6 +- block.c | 2 +- block/backup.c | 7 +-- block/dirty-bitmap.c | 130 ++++++++++++++----------------------------- block/mirror.c | 76 +++++++++++-------------- block/qcow2-bitmap.c | 57 +++++++++---------- block/qcow2.c | 22 ++++---- migration/block.c | 12 ++-- tests/test-hbitmap.c | 10 ++-- util/hbitmap.c | 8 +-- 13 files changed, 154 insertions(+), 227 deletions(-) -- 2.13.5