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block/dirty-bitmap: add recording and busy properties
The current API allows us to report a single status, which we've defined as: Frozen: has a successor, treated as qmp_locked, may or may not be enabled. Locked: no successor, qmp_locked. may or may not be enabled. Disabled: Not frozen or locked, disabled. Active: Not frozen, locked, or disabled. The problem is that both "Frozen" and "Locked" mean nearly the same thing, and that both of them do not intuit whether they are recording guest writes or not. This patch deprecates that status field and introduces two orthogonal properties instead to replace it. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20190223000614.13894-2-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com>
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@ -226,6 +226,13 @@ DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap)
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}
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}
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/* Called with BQL taken. */
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static bool bdrv_dirty_bitmap_recording(BdrvDirtyBitmap *bitmap)
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{
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return !bitmap->disabled || (bitmap->successor &&
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!bitmap->successor->disabled);
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}
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/**
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* Create a successor bitmap destined to replace this bitmap after an operation.
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* Requires that the bitmap is not frozen and has no successor.
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@ -448,6 +455,8 @@ BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
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info->has_name = !!bm->name;
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info->name = g_strdup(bm->name);
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info->status = bdrv_dirty_bitmap_status(bm);
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info->recording = bdrv_dirty_bitmap_recording(bm);
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info->busy = bdrv_dirty_bitmap_user_locked(bm);
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info->persistent = bm->persistent;
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entry->value = info;
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*plist = entry;
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@ -467,7 +467,14 @@
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#
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# @granularity: granularity of the dirty bitmap in bytes (since 1.4)
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#
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# @status: current status of the dirty bitmap (since 2.4)
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# @status: Deprecated in favor of @recording and @locked. (since 2.4)
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#
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# @recording: true if the bitmap is recording new writes from the guest.
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# Replaces `active` and `disabled` statuses. (since 4.0)
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#
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# @busy: true if the bitmap is in-use by some operation (NBD or jobs)
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# and cannot be modified via QMP or used by another operation.
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# Replaces `locked` and `frozen` statuses. (since 4.0)
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#
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# @persistent: true if the bitmap will eventually be flushed to persistent
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# storage (since 4.0)
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@ -476,6 +483,7 @@
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##
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{ 'struct': 'BlockDirtyInfo',
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'data': {'*name': 'str', 'count': 'int', 'granularity': 'uint32',
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'recording': 'bool', 'busy': 'bool',
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'status': 'DirtyBitmapStatus', 'persistent': 'bool' } }
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##
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@ -72,6 +72,12 @@ by the @code{tls-authz} and @code{sasl-authz} options.
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"autoload" parameter is now ignored. All bitmaps are automatically loaded
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from qcow2 images.
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@subsection query-block result field dirty-bitmaps[i].status (since 4.0)
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The ``status'' field of the ``BlockDirtyInfo'' structure, returned by
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the query-block command is deprecated. Two new boolean fields,
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``recording'' and ``busy'' effectively replace it.
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@subsection query-cpus (since 2.12.0)
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The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
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@ -22,17 +22,21 @@ write -P0xcd 0x3ff0000 64k
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"bitmaps": {
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"drive0": [
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapB",
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"persistent": false,
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"recording": true,
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"status": "active"
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},
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapA",
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"persistent": false,
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"recording": true,
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"status": "active"
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}
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]
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@ -84,17 +88,21 @@ write -P0xcd 0x3ff0000 64k
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"bitmaps": {
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"drive0": [
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapB",
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"persistent": false,
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"recording": true,
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"status": "active"
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},
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapA",
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"persistent": false,
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"recording": true,
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"status": "active"
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}
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]
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@ -184,24 +192,30 @@ write -P0xea 0x3fe0000 64k
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"bitmaps": {
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"drive0": [
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{
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"busy": false,
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"count": 393216,
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"granularity": 65536,
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"name": "bitmapC",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapB",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 458752,
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"granularity": 65536,
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"name": "bitmapA",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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}
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]
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@ -251,24 +265,30 @@ write -P0xea 0x3fe0000 64k
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"bitmaps": {
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"drive0": [
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{
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"busy": false,
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"count": 393216,
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"granularity": 65536,
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"name": "bitmapC",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapB",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 458752,
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"granularity": 65536,
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"name": "bitmapA",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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}
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]
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@ -311,31 +331,39 @@ write -P0xea 0x3fe0000 64k
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"bitmaps": {
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"drive0": [
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{
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"busy": false,
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"count": 458752,
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"granularity": 65536,
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"name": "bitmapD",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 393216,
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"granularity": 65536,
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"name": "bitmapC",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 262144,
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"granularity": 65536,
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"name": "bitmapB",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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},
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{
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"busy": false,
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"count": 458752,
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"granularity": 65536,
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"name": "bitmapA",
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"persistent": false,
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"recording": false,
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"status": "disabled"
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}
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]
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