Re: [libvirt] [Qemu-devel] [PATCH v3] qapi: add dirty-bitmaps to query-named-block-nodes result

From: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com&gt; Let's add a possibility to query dirty-bitmaps not only on root nodes. It is useful when dealing both with snapshots and incremental backups. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com&gt; [Added deprecation information. --js] Signed-off-by: John Snow <jsnow(a)redhat.com&gt; --- block/qapi.c | 5 +++++ qapi/block-core.json | 6 +++++- qemu-deprecated.texi | 12 ++++++++++++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/block/qapi.c b/block/qapi.c index 917435f022..15f1030264 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -79,6 +79,11 @@ BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk, info->backing_file = g_strdup(bs->backing_file); } + if (!QLIST_EMPTY(&bs->dirty_bitmaps)) { + info->has_dirty_bitmaps = true; + info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs); + } + info->detect_zeroes = bs->detect_zeroes; if (blk && blk_get_public(blk)->throttle_group_member.throttle_state) { diff --git a/qapi/block-core.json b/qapi/block-core.json index 0d43d4f37c..9210ae233d 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -360,6 +360,9 @@ # @write_threshold: configured write threshold for the device. # 0 if disabled. (Since 2.3) # +# @dirty-bitmaps: dirty bitmaps information (only present if node +# has one or more dirty bitmaps) (Since 4.2) +# # Since: 0.14.0 # ## @@ -378,7 +381,7 @@ '*bps_wr_max_length': 'int', '*iops_max_length': 'int', '*iops_rd_max_length': 'int', '*iops_wr_max_length': 'int', '*iops_size': 'int', '*group': 'str', 'cache': 'BlockdevCacheInfo', - 'write_threshold': 'int' } } + 'write_threshold': 'int', '*dirty-bitmaps': ['BlockDirtyInfo'] } } ## # @BlockDeviceIoStatus: @@ -656,6 +659,7 @@ # # @dirty-bitmaps: dirty bitmaps information (only present if the # driver has one or more dirty bitmaps) (Since 2.0) +# Deprecated in 4.2; see BlockDirtyInfo instead. # # @io-status: @BlockDeviceIoStatus. Only present if the device # supports it and the VM is configured to stop on errors diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi index c90b08d553..6374b66546 100644 --- a/qemu-deprecated.texi +++ b/qemu-deprecated.texi @@ -134,6 +134,18 @@ The ``status'' field of the ``BlockDirtyInfo'' structure, returned by the query-block command is deprecated. Two new boolean fields, ``recording'' and ``busy'' effectively replace it. +@subsection query-block result field dirty-bitmaps (Since 4.2) + +The ``dirty-bitmaps`` field of the ``BlockInfo`` structure, returned by +the query-block command is itself now deprecated. The ``dirty-bitmaps`` +field of the ``BlockDeviceInfo`` struct should be used instead, which is the +type of the ``inserted`` field in query-block replies, as well as the +type of array items in query-named-block-nodes.

+Since the ``dirty-bitmaps`` field is optionally present in both the old and +new locations, clients must use introspection to learn where to anticipate +the field if/when it does appear in command output. +

@subsection query-cpus (since 2.12.0) The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.