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From f678429fca4701bda6a4631722e99c57a977846f Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 6 Feb 2019 22:12:30 +0100
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Subject: [PATCH 20/33] qapi: add transaction support for
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x-block-dirty-bitmap-merge
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190206221243.7407-11-jsnow@redhat.com>
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Patchwork-id: 84270
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH v2 10/23] qapi: add transaction support for x-block-dirty-bitmap-merge
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Bugzilla: 1658343
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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New action is like clean action: do the whole thing in .prepare and
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undo in .abort. This behavior for bitmap-changing actions is needed
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because backup job actions use bitmap in .prepare.
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Reviewed-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit 6fd2e40789ef7389b17c5fff93b0bf82d4352cb3)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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blockdev.c | 35 +++++++++++++++++++++++++++++++++++
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qapi/transaction.json | 2 ++
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2 files changed, 37 insertions(+)
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diff --git a/blockdev.c b/blockdev.c
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index 853dd0e..df0cbe2 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -2264,6 +2264,35 @@ static void block_dirty_bitmap_disable_abort(BlkActionState *common)
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}
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}
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+static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
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+ Error **errp)
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+{
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+ BlockDirtyBitmapMerge *action;
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+ BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
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+ common, common);
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+ BdrvDirtyBitmap *merge_source;
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+
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+ if (action_check_completion_mode(common, errp) < 0) {
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+ return;
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+ }
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+
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+ action = common->action->u.x_block_dirty_bitmap_merge.data;
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+ state->bitmap = block_dirty_bitmap_lookup(action->node,
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+ action->dst_name,
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+ &state->bs,
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+ errp);
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+ if (!state->bitmap) {
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+ return;
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+ }
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+
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+ merge_source = bdrv_find_dirty_bitmap(state->bs, action->src_name);
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+ if (!merge_source) {
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+ return;
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+ }
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+
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+ bdrv_merge_dirty_bitmap(state->bitmap, merge_source, &state->backup, errp);
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+}
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+
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static void abort_prepare(BlkActionState *common, Error **errp)
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{
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error_setg(errp, "Transaction aborted using Abort action");
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@@ -2335,6 +2364,12 @@ static const BlkActionOps actions[] = {
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.prepare = block_dirty_bitmap_disable_prepare,
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.abort = block_dirty_bitmap_disable_abort,
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},
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+ [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_MERGE] = {
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+ .instance_size = sizeof(BlockDirtyBitmapState),
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+ .prepare = block_dirty_bitmap_merge_prepare,
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+ .commit = block_dirty_bitmap_free_backup,
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+ .abort = block_dirty_bitmap_restore,
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+ },
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/* Where are transactions for MIRROR, COMMIT and STREAM?
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* Although these blockjobs use transaction callbacks like the backup job,
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* these jobs do not necessarily adhere to transaction semantics.
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diff --git a/qapi/transaction.json b/qapi/transaction.json
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index d7e4274..5875cdb 100644
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--- a/qapi/transaction.json
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+++ b/qapi/transaction.json
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@@ -48,6 +48,7 @@
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# - @block-dirty-bitmap-clear: since 2.5
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# - @x-block-dirty-bitmap-enable: since 3.0
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# - @x-block-dirty-bitmap-disable: since 3.0
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+# - @x-block-dirty-bitmap-merge: since 3.1
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# - @blockdev-backup: since 2.3
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# - @blockdev-snapshot: since 2.5
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# - @blockdev-snapshot-internal-sync: since 1.7
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@@ -63,6 +64,7 @@
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'block-dirty-bitmap-clear': 'BlockDirtyBitmap',
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'x-block-dirty-bitmap-enable': 'BlockDirtyBitmap',
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'x-block-dirty-bitmap-disable': 'BlockDirtyBitmap',
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+ 'x-block-dirty-bitmap-merge': 'BlockDirtyBitmapMerge',
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'blockdev-backup': 'BlockdevBackup',
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'blockdev-snapshot': 'BlockdevSnapshot',
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'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',
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--
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1.8.3.1
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