From c85feafa98e3f7835407d39bf5bfadf13f32075f Mon Sep 17 00:00:00 2001
From: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Date: Wed, 10 May 2023 18:06:23 +0300
Subject: [PATCH] blockdev: use state.bitmap in block-dirty-bitmap-add action
Other bitmap related actions use the .bitmap pointer in .abort action,
let's do same here:
1. It helps further refactoring, as bitmap-add is the only bitmap
action that uses state.action in .abort
2. It must be safe: transaction actions rely on the fact that on
.abort() the state is the same as at the end of .prepare(), so that
in .abort() we could precisely rollback the changes done by
.prepare().
The only way to remove the bitmap during transaction should be
block-dirty-bitmap-remove action, but it postpones actual removal to
.commit(), so we are OK on any rollback path. (Note also that
bitmap-remove is the only bitmap action that has .commit() phase,
except for simple g_free the state on .clean())
3. Again, other bitmap actions behave this way: keep the bitmap pointer
during the transaction.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-Id: <20230510150624.310640-6-vsementsov@yandex-team.ru>
[kwolf: Also remove the now unused BlockDirtyBitmapState.prepared]
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index a2ebaa5afc..4bf15566b2 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1979,7 +1979,6 @@ typedef struct BlockDirtyBitmapState {
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
HBitmap *backup;
- bool prepared;
bool was_enabled;
} BlockDirtyBitmapState;
@@ -2008,7 +2007,8 @@ static void block_dirty_bitmap_add_action(BlkActionState *common,
&local_err);
if (!local_err) {
- state->prepared = true;
+ state->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
+ NULL, &error_abort);
} else {
error_propagate(errp, local_err);
}
@@ -2016,15 +2016,10 @@ static void block_dirty_bitmap_add_action(BlkActionState *common,
static void block_dirty_bitmap_add_abort(void *opaque)
{
- BlockDirtyBitmapAdd *action;
BlockDirtyBitmapState *state = opaque;
- action = state->common.action->u.block_dirty_bitmap_add.data;
- /* Should not be able to fail: IF the bitmap was added via .prepare(),
- * then the node reference and bitmap name must have been valid.
- */
- if (state->prepared) {
- qmp_block_dirty_bitmap_remove(action->node, action->name, &error_abort);
+ if (state->bitmap) {
+ bdrv_release_dirty_bitmap(state->bitmap);
}
}
--
2.30.2