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qapi: add transaction support for x-block-dirty-bitmap-merge

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New action is like clean action: do the whole thing in .prepare and
undo in .abort. This behavior for bitmap-changing actions is needed
because backup job actions use bitmap in .prepare.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-10-29 16:23:15 -04:00 committed by John Snow
parent 5c4cf8b294
commit 6fd2e40789
2 changed files with 37 additions and 0 deletions
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35
blockdev.c
View file

@ -2113,6 +2113,35 @@ static void block_dirty_bitmap_disable_abort(BlkActionState *common)
}
}
static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
Error **errp)
{
BlockDirtyBitmapMerge *action;
BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
common, common);
BdrvDirtyBitmap *merge_source;
if (action_check_completion_mode(common, errp) < 0) {
return;
}
action = common->action->u.x_block_dirty_bitmap_merge.data;
state->bitmap = block_dirty_bitmap_lookup(action->node,
action->dst_name,
&state->bs,
errp);
if (!state->bitmap) {
return;
}
merge_source = bdrv_find_dirty_bitmap(state->bs, action->src_name);
if (!merge_source) {
return;
}
bdrv_merge_dirty_bitmap(state->bitmap, merge_source, &state->backup, errp);
}
static void abort_prepare(BlkActionState *common, Error **errp)
{
error_setg(errp, "Transaction aborted using Abort action");
@ -2184,6 +2213,12 @@ static const BlkActionOps actions[] = {
.prepare = block_dirty_bitmap_disable_prepare,
.abort = block_dirty_bitmap_disable_abort,
},
[TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_MERGE] = {
.instance_size = sizeof(BlockDirtyBitmapState),
.prepare = block_dirty_bitmap_merge_prepare,
.commit = block_dirty_bitmap_free_backup,
.abort = block_dirty_bitmap_restore,
},
/* Where are transactions for MIRROR, COMMIT and STREAM?
* Although these blockjobs use transaction callbacks like the backup job,
* these jobs do not necessarily adhere to transaction semantics.

2
qapi/transaction.json
View file

@ -48,6 +48,7 @@
# - @block-dirty-bitmap-clear: since 2.5
# - @x-block-dirty-bitmap-enable: since 3.0
# - @x-block-dirty-bitmap-disable: since 3.0
# - @x-block-dirty-bitmap-merge: since 3.1
# - @blockdev-backup: since 2.3
# - @blockdev-snapshot: since 2.5
# - @blockdev-snapshot-internal-sync: since 1.7
@ -63,6 +64,7 @@
'block-dirty-bitmap-clear': 'BlockDirtyBitmap',
'x-block-dirty-bitmap-enable': 'BlockDirtyBitmap',
'x-block-dirty-bitmap-disable': 'BlockDirtyBitmap',
'x-block-dirty-bitmap-merge': 'BlockDirtyBitmapMerge',
'blockdev-backup': 'BlockdevBackup',
'blockdev-snapshot': 'BlockdevSnapshot',
'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',