From f678429fca4701bda6a4631722e99c57a977846f Mon Sep 17 00:00:00 2001 From: John Snow Date: Wed, 6 Feb 2019 22:12:30 +0100 Subject: [PATCH 20/33] qapi: add transaction support for x-block-dirty-bitmap-merge RH-Author: John Snow Message-id: <20190206221243.7407-11-jsnow@redhat.com> Patchwork-id: 84270 O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH v2 10/23] qapi: add transaction support for x-block-dirty-bitmap-merge Bugzilla: 1658343 RH-Acked-by: Thomas Huth RH-Acked-by: Laurent Vivier RH-Acked-by: Stefan Hajnoczi From: Vladimir Sementsov-Ogievskiy 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 Reviewed-by: John Snow (cherry picked from commit 6fd2e40789ef7389b17c5fff93b0bf82d4352cb3) Signed-off-by: John Snow Signed-off-by: Miroslav Rezanina --- blockdev.c | 35 +++++++++++++++++++++++++++++++++++ qapi/transaction.json | 2 ++ 2 files changed, 37 insertions(+) diff --git a/blockdev.c b/blockdev.c index 853dd0e..df0cbe2 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2264,6 +2264,35 @@ 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"); @@ -2335,6 +2364,12 @@ 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. diff --git a/qapi/transaction.json b/qapi/transaction.json index d7e4274..5875cdb 100644 --- a/qapi/transaction.json +++ b/qapi/transaction.json @@ -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', -- 1.8.3.1