Hi all! There is a new update of qcow2-bitmap series - v20.
web: https://src.openvz.org/users/vsementsov/repos/qemu/browse?at=qcow2-bitmap-v20 git: https://src.openvz.org/scm/~vsementsov/qemu.git (tag qcow2-bitmap-v20) v20: handle reopening images ro and rw. On reopening ro: store bitmaps (storing sets 'IN_USE'=0 in the image) and mark them readonly (set readonly flag in BlockDirtyBitmap) After reopening rw: mark bitmaps IN_USE in the image and unset readonly flag in BlockDirtyBitmap 09: new 10: improve comment add parameter 'value' to bdrv_dirty_bitmap_set_readonly 11: use new parameter of bdrv_dirty_bitmap_set_readonly 12-14, 20: new v19: rebased on master 05: move 'sign-off' over 'reviewed-by's 08: error_report -> error_setg in qcow2_truncate (because of rebase) 09: return EPERM in bdrv_aligned_pwritev and bdrv_co_pdiscard if there are readonly bitmaps. EPERM is chosen because it is already used for readonly image in bdrv_co_pdiscard. Also handle readonly bitmap in block_dirty_bitmap_clear_prepare and qmp_block_dirty_bitmap_clear Max's r-b is not added 10: fix grammar in comment add Max's r-b 12, 13, 15, 21: add Max's r-b 24: fix grammar in comment 25: fix grammar and wording in comment also, I see contextual changes in inactiavate mechanism. Hope, they do not affect these series. v18: rebased on master (sorry for v17) 08: contextual: qcow2_do_open is changed instead of qcow2_open rename s/need_update_header/update_header/ in qcow2_do_open, to not do it in 10 save r-b's by Max and John 09: new patch 10: load_bitmap_data: do not clear bitmap parameter - it should be already cleared (it actually created before single load_bitmap_data() call) if some bitmaps are loaded, but we can't write the image (it is readonly or inactive), so we can't mark bitmaps "in use" in the image, mark corresponding BdrvDirtyBitmap read-only. change error_setg to error_setg_errno for "Can't update bitmap directory" no needs to rename s/need_update_header/update_header/ here, as it done in 08 13: function bdrv_has_persistent_bitmaps becomes bdrv_has_changed_persistent_bitmaps, to handle readonly field. 14: declaration moved to the bottom of .h, save r-b's 15: firstly check bdrv_has_changed_persistent_bitmaps and only then fail on !can_write, and then QSIMPLEQ_INIT(&drop_tables) skip readonly bitmaps in saving loop 18: remove '#optional', 2.9 -> 2.10, save r-b's 19: remove '#optional', 2.9 -> 2.10, save r-b's 20: 2.9 -> 2.10, save r-b's 21: add check of read-only image open, drop r-b's 24: add comment to qapi/block-core.json, that block-dirty-bitmap-add removes bitmap from storage. r-b's by Max and John saved v17: 08: add r-b's by Max and John 09: clear unknown autoclear features from BDRVQcow2State before calling qcow2_load_autoloading_dirty_bitmaps(), and also do not extra update header if it is updated by qcow2_load_autoloading_dirty_bitmaps(). 11: new patch, splitted out from 16 12: rewrite commit message 14: changing bdrv_close moved to separate new patch 11 s/1/1ULL/ ; s/%u/%llu/ for two errors 16: s/No/Not/ add Max's r-b 24: new patch v16: mostly by Kevin's comments: 07: just moved here, as preparation for merging refcounts to 08 08: move "qcow2-bitmap: refcounts" staff to this patch, to not break qcow2-img check drop r-b's move necessary supporting static functions to this patch too (to not break compilation) fprintf -> error_report other small changes with error messages and comments code style for qcow2-bitmap.c: 'include "exec/log.h"' was dropped s/1/(1U << 0) for BME_FLAG_IN_USE add BME_TABLE_ENTRY_FLAG_ALL_ONES to replace magic 1 don't check 'cluster_size <= 0' in check_table_entry old "[PATCH v15 08/25] block: introduce auto-loading bitmaps" was dropped 09: was "[PATCH v15 09/25] qcow2: add .bdrv_load_autoloading_dirty_bitmaps" drop r-b's some staff was moved to 08 update_header_sync - error on bdrv_flush fail rename disk_sectors_in_bitmap_cluster to sectors_covered_by_bitmap_cluster and adjust comment. so, variable for storing this function result: s/dsc/sbc/ s/1/BME_TABLE_ENTRY_FLAG_ALL_ONES/ also, as Qcow2BitmapTable already introduced in 08, s/table_offset/table.offset/ and s/table_size/table.size, etc.. update_ext_header_and_dir_in_place: add comments, add additional update_header_sync, to reduce indeterminacy in case of error. call qcow2_load_autoloading_dirty_bitmaps directly from qcow2_open no .bdrv_load_autoloading_dirty_bitmaps 11: drop bdrv_store_persistent_dirty_bitmaps at all. drop r-b's 13: rename patch, rewrite commit msg drop r-b's move bdrv_release_named_dirty_bitmaps in bdrv_close() after drv->bdrv_close() Qcow2BitmapTable is already introduced, so no s/table_offset/table.offset/ and s/table_size/table.size, etc.. here old 25 with check_constraints_on_bitmap() improvements merged here (Eric) like in 09, s/dsc/sbc/ and s/disk_sectors_in_bitmap_cluster/sectors_covered_by_bitmap_cluster/ no .bdrv_store_persistent_dirty_bitmaps call qcow2_store_persistent_dirty_bitmaps directly from qcow2_inactivate 15: corresponding part of 25 merged here. Add John's r-b, as 25 was also reviewed by John. 16: add John's r-b v15: 13,14: add John's r-b 15: qcow2_can_store_new_dirty_bitmap: - check max dirty bitmaps and bitmap directory overhead - switch to error_prepend rm Max's r-b not add John's r-b 17-24: add John's r-b 25: changed because 15 changed, not add John's r-b v14: 07: use '|=' to update need_update_header add John's r-b add Max's r-b 09: remove unused bitmap_table_to_cpu() left Max's r-b, hope it's ok add John's r-b 10: remove extra new line add John's r-b 11: add John's r-b 12: add John's r-b 13: small fixes by John's review: - remove weird g_free of NULL pointer from if (tb == NULL) { g_free(tb); return -EINVAL; } - remove extra comment "/* errp is already set */" - s/"Too large bitmap directory"/"Bitmap directory is too large"/ left Max's r-b, hope you don't mind 22: add Max's r-b 23: add Max's r-b 24: add Max's r-b 25: new patch to improve error message on check_constraints_on_bitmap fail v13: Just a fix for style checker. 13: line over 80 14: line over 80 22: s/if () \n{/if () {/ v12: 07: do not update header in qcow2_read_extensions, instead do it in the end of qcow2_open, where it is updated also to clear unknown autoclear features. Wrong bdrv_is_root_node used instead of bdrv_is_read_only is fixed automatically. 08: add Max's r-b 09: contextual: s/raw_bsd/raw-format/ qcow2-bitmap.c: copyright s/2016/2017/ fix compilation: move update_header_sync() to this patch add Max's r-b 13: update_header_sync() is moved to 09 add Max's r-b 15: add Max's r-b 16: As qmp-commands.txt is removed from master, remove it here too. Sentence "For now only Qcow2 disks support persistent bitmaps. Default is false." moved to qapi/block-core.json. Hope that is OK, Max's r-b is not dropped. 17: qmp-commands.txt deleted, r-b is not dropped too. 18: s/is failed/has failed/, add Max's r-b 19: copyright: s/2016/2017/ 21: drop "res->corruptions > 0 => ret = -EINVAL", add Max's r-b 22: actually, patch is replaced with a new one, however some parts are the same. instead of changing bdrv_release_dirty_bitmap behaviour, create new bdrv_remove_persistent_dirty_bitmap 23: improve comment, about not-exists is not an error 24: new patch Old 24 (qcow2-bitmap: cache bitmap list in BDRVQcow2State) will be sent separately, to be applied after these series. Also: about bdrv_dirty_bitmap_set_persistance: I've decided not change its behaviour for now and just call bdrv_remove_persistent_dirty_bitmap from qmp_block_dirty_bitmap_remove. Reasons: 1. Do not change reviewed part. 2. I'm not sure, that this complication of BdrvDirtyBitmap.persistent semantics is good (current semantics are just: .persistent means that bitmap should be saved on disk close). .persistent actually is not very related to "is there stored version of the bitmap in the image". 3. It may be done later. 4. It is not actually needed for now, as the only usage is dropping bitmap in bdrv_remove_persistent_dirty_bitmap. May be in future it will be needed, when we will have qmp interfaces for finer control of persistent dirty bitmaps. v11: Fix automatic build test fail. 18: wording - "ASCII representation of SHA256 ..." 24: fix redeclaration error. (This is still RFC, may be not needed patch, see description in v10 below). v10: 07: rm John's r-b not add Max's r-b fix subject s/dirty bitmaps/bitmaps improve WARNING message remove header ext if autoclear bit is unset, through qcow2_updata_header() - r-b blocking change 08: move bdrv_load_autoloading_dirty_bitmaps under asserts block (Max) fix typo in commit message move bdrv_load_autoloading_dirty_bitmaps after asserts John's r-b 09: rewrite check_dir_entry remove extra feature cluster_size=0 from check_table_entry which clears autoclear bit before trying to update bitmap directory bitmap_list_store - do not free old clusters if in_place=true changes in comments, fix indents add functions bitmap_list_count update_ext_header_and_dir_in_place (unset autoclear bit before trying to modify bitmap directory) (for usage in qcow2_load_autoloading_dirty_bitmaps) 11: add node name to error report Max's r-b 13: add type Qcow2BitmapTable move from bm.table_* to bm.table.* rewrite check_constraints_on_bitmap flush(bs->file) instead of flush(bs) in update_ext_header_and_dir assert(DIV_ROUND_UP(bm_size, dsc) == tb_size); and assert(write_size <= s->cluster_size); in store_bitmap_data fix: s/tb_size/tb_size * sizeof(tb[0]) in store_bitmap in qcow2_store_persistent_dirty_bitmaps: fail if !can_write fix counting of new_nb_bitmaps and new_dir_size free old clusters _after_ successful directory update (aggregate old bitmap tables into drop_tables) 2 14: rename to can_store_new_dirty_bitmap Max's r-b 15: rename to can_store_new_dirty_bitmap rm extra !! 16: Max's r-b rename to can_store_new_dirty_bitmap indenting Since s/2.8/2.9 17: Max's r-b Since s/2.8/2.9 18: hashing can fail in comment for qapi Since s/2.8/2.9 remove dead comment 19: indentation Max's r-b 20: Max's r-b 21: fix error handling return 0 if nb_bitmaps == 0 new patches: 22-23: remove bitmap from file on bdrv_release_dirty_bitmap 24: experimental, RFC: cache bitmap list to bs, to not reload it from file. I'm not sure that is needed now, but if you want I can merge it to earlier patches. v9: rebase on master! 01-04,06,07: John's r-b 03: rewording in comment ("The concurrent resetting ..."), John's r-b 07: reword error messages commit message: dirty bitmap -> bitmap 09: fix uninitialized ret in bitmap_list_store() (fix compilation warning) 18: fix compilation of tests/test-hbitmap also, change constants names for qcow2: DIRTY_BITMAP -> BITMAP (as it is not dirty bitmaps extension, but just bitmaps extension), QCOW -> QCOW2 (bitmaps are only for qcow2) v8: Patches 01-06 are mostly unchanged, except for spelling and wording. 02 - add Eric's r-b 03,04 - add Max's r-b 07-09 is refactored "bitmap-read" part of the feature. Main changes: - introduce bitmap list - normal list, which represents bitmap directory. Function bitmap_list_load loads bitmap directory, checks everything and creates normal list. - introduce .bdrv_load_autoloading_dirty_bitmaps : instead of loading bitmaps in qcow2_open, lets load them only in bdrv_open, to avoid reloading in bdrv_snapshot_goto - do not delete bitmaps after read, but mark them IN_USE 10 has contextual changes and rewording of comment. I've added Max's r-b, hope it's ok. 11: add error_report("Persistent bitmaps are lost") in case of failed bitmap store 12: add Max's r-b 13 is refactored "bitmap-store" part of the feature. see 07-09 description - for now I just free old clusters and allocate new. This will be improved with a separate patch. patch about "delete bitmaps on truncate" is removed. This case will be handled later. IN_USE, autoclear, check-constraints things are merged into other patches. 14-15 are mew patches, to early check possibility of creating persistent bitmap with specified name and granularity in specified BDS 16-17: spelling, rewording, indenting, tiny code simplifying, check can_store (by 14-15), s/if (autoload && !persistent)/if (has_autoload && !persistent)/, rebase (deleted qmp-commands.hx) 18: alternative to md5 in query-block: - separated qmp command -x-debug-block-dirty-bitmap-sha256 - as adviced by Daniel P. Berrange in my parallel thread: - sha256 instead of md5 - use qcrypto_hash_* instead of GChecksum - fix bug =) (size was wrong in hbitmap_md5) 19: s/3999/3fff/, use x-debug-block-dirty-bitmap-sha256 20: new patch to rename and publish inc_refcounts 21: some fixes and refactoring mostyly by Max's comments. Max, Eric, great tanks for your review! I hope, I've covered most of your comments by this update. TODO: - handle reopening image RO->RW and incoming migration, set IN_USE for existing loaded bitmaps in these cases. - reuse old, already allocated data clusters for bitmaps storing - truncate bitmaps in the image on truncate v7: https://src.openvz.org/users/vsementsov/repos/qemu/browse?at=refs%2Ftags%2Fqcow2-bitmap-v7 based on block-next (https://github.com/XanClic/qemu/commits/block-next) - a lot of refactoring and reordering of patches. - dead code removed (bdrv_dirty_bitmap_load, etc.) - do not maintain extra data for now - do not store dirty bitmap directory in memory (as we use it seldom, we can just reread if needed) By Kevin's review: 01 - commit message changed: fix->improvement (as it was not a bug) 03 - r-b 04 - r-b 05 - add 21 patch to fix spec, also, removed all (I hope) mentions of "Bitmap Header", switch to one unified name for it - "Bitmap Directory Entry", to avoid misunderstanding with Qcow2 header. (also, add patch 22, to fix it in spec) v6.06 - improve for_each_dir_entry loop, reorder patches, other small fixes v6.07 ~> v7.09 - dead code removed, I've moved to one function .bdrv_store_persistent_bitmaps and have wrapper and callback in one patch (with also some other staff. If it not ok, I can split them) v6.08 - about keeping bitmap directory instead of bitmap list: no I don't keep it at all. v6.16 - old bdrv_ bitmap-storing related functions are removed. The new one is bdrv_store_persistent_bitmaps. v6: https://src.openvz.org/users/vsementsov/repos/qemu/browse?at=refs%2Ftags%2Fqcow2-bitmap-v6 based on block-next (https://github.com/XanClic/qemu/commits/block-next) There are a lot of changes, reorderings and additions in comparement with v5. One principal thing: now bitmaps are removed from image after loading instead of marking them in_use. It is simpler and we do not need to store superfluous data. Also, we are no more interested in command line interface to dirty bitmaps. So it is dropped. If someone needs it I can add it later. Vladimir Sementsov-Ogievskiy (30): specs/qcow2: fix bitmap granularity qemu-specific note specs/qcow2: do not use wording 'bitmap header' hbitmap: improve dirty iter tests: add hbitmap iter test block: fix bdrv_dirty_bitmap_granularity signature block/dirty-bitmap: add deserialize_ones func qcow2-refcount: rename inc_refcounts() and make it public qcow2: add bitmaps extension block/dirty-bitmap: fix comment for BlockDirtyBitmap.disabled field block/dirty-bitmap: add readonly field to BdrvDirtyBitmap qcow2: autoloading dirty bitmaps block: refactor bdrv_reopen_commit block: new bdrv_reopen_bitmaps_rw interface qcow2: support .bdrv_reopen_bitmaps_rw block/dirty-bitmap: add autoload field to BdrvDirtyBitmap block: bdrv_close: release bitmaps after drv->bdrv_close block: introduce persistent dirty bitmaps block/dirty-bitmap: add bdrv_dirty_bitmap_next() qcow2: add persistent dirty bitmaps support qcow2: store bitmaps on reopening image as read-only block: add bdrv_can_store_new_dirty_bitmap qcow2: add .bdrv_can_store_new_dirty_bitmap qmp: add persistent flag to block-dirty-bitmap-add qmp: add autoload parameter to block-dirty-bitmap-add qmp: add x-debug-block-dirty-bitmap-sha256 iotests: test qcow2 persistent dirty bitmap block/dirty-bitmap: add bdrv_remove_persistent_dirty_bitmap qcow2: add .bdrv_remove_persistent_dirty_bitmap qmp: block-dirty-bitmap-remove: remove persistent block: release persistent bitmaps on inactivate block.c | 63 +- block/Makefile.objs | 2 +- block/dirty-bitmap.c | 144 +++- block/io.c | 8 + block/qcow2-bitmap.c | 1481 ++++++++++++++++++++++++++++++++++++++++++ block/qcow2-refcount.c | 59 +- block/qcow2.c | 155 ++++- block/qcow2.h | 43 ++ blockdev.c | 77 ++- docs/specs/qcow2.txt | 8 +- include/block/block.h | 3 + include/block/block_int.h | 14 + include/block/dirty-bitmap.h | 26 +- include/qemu/hbitmap.h | 49 +- qapi/block-core.json | 42 +- tests/Makefile.include | 2 +- tests/qemu-iotests/165 | 105 +++ tests/qemu-iotests/165.out | 5 + tests/qemu-iotests/group | 1 + tests/test-hbitmap.c | 19 + util/hbitmap.c | 51 +- 21 files changed, 2276 insertions(+), 81 deletions(-) create mode 100644 block/qcow2-bitmap.c create mode 100755 tests/qemu-iotests/165 create mode 100644 tests/qemu-iotests/165.out -- 2.11.1
