[Qemu-devel] [PATCH v3 01/10] qapi: Add transaction support to block-dirty-bitmap operations

[John Snow <jsnow@redhat.com>]

This adds two qmp commands to transactions.

block-dirty-bitmap-add allows you to create a bitmap simultaneously
alongside a new full backup to accomplish a clean synchronization
point.

block-dirty-bitmap-clear allows you to reset a bitmap back to as-if
it were new, which can also be used alongside a full backup to
accomplish a clean synchronization point.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 blockdev.c       | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 docs/bitmaps.md  |   2 +-
 qapi-schema.json |   6 +++-
 3 files changed, 106 insertions(+), 2 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index b9c79ed..d162e10 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1693,6 +1693,95 @@ static void blockdev_backup_clean(BlkTransactionState *common)
     }
 }
 
+typedef struct BlockDirtyBitmapState {
+    BlkTransactionState common;
+    BdrvDirtyBitmap *bitmap;
+    BlockDriverState *bs;
+    AioContext *aio_context;
+    bool prepared;
+} BlockDirtyBitmapState;
+
+static void block_dirty_bitmap_add_prepare(BlkTransactionState *common,
+                                           Error **errp)
+{
+    Error *local_err = NULL;
+    BlockDirtyBitmapAdd *action;
+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
+                                             common, common);
+
+    action = common->action->block_dirty_bitmap_add;
+    /* AIO context taken within qmp_block_dirty_bitmap_add */
+    qmp_block_dirty_bitmap_add(action->node, action->name,
+                               action->has_granularity, action->granularity,
+                               &local_err);
+
+    if (!local_err) {
+        state->prepared = true;
+    } else {
+        error_propagate(errp, local_err);
+    }
+}
+
+static void block_dirty_bitmap_add_abort(BlkTransactionState *common)
+{
+    BlockDirtyBitmapAdd *action;
+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
+                                             common, common);
+
+    action = common->action->block_dirty_bitmap_add;
+    /* 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);
+    }
+}
+
+static void block_dirty_bitmap_clear_prepare(BlkTransactionState *common,
+                                             Error **errp)
+{
+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
+                                             common, common);
+    BlockDirtyBitmap *action;
+
+    action = common->action->block_dirty_bitmap_clear;
+    state->bitmap = block_dirty_bitmap_lookup(action->node,
+                                              action->name,
+                                              &state->bs,
+                                              &state->aio_context,
+                                              errp);
+    if (!state->bitmap) {
+        return;
+    }
+
+    if (bdrv_dirty_bitmap_frozen(state->bitmap)) {
+        error_setg(errp, "Cannot modify a frozen bitmap");
+        return;
+    } else if (!bdrv_dirty_bitmap_enabled(state->bitmap)) {
+        error_setg(errp, "Cannot clear a disabled bitmap");
+        return;
+    }
+
+    /* AioContext is released in .clean() */
+}
+
+static void block_dirty_bitmap_clear_commit(BlkTransactionState *common)
+{
+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
+                                             common, common);
+    bdrv_clear_dirty_bitmap(state->bitmap);
+}
+
+static void block_dirty_bitmap_clear_clean(BlkTransactionState *common)
+{
+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
+                                             common, common);
+
+    if (state->aio_context) {
+        aio_context_release(state->aio_context);
+    }
+}
+
 static void abort_prepare(BlkTransactionState *common, Error **errp)
 {
     error_setg(errp, "Transaction aborted using Abort action");
@@ -1733,6 +1822,17 @@ static const BdrvActionOps actions[] = {
         .abort = internal_snapshot_abort,
         .clean = internal_snapshot_clean,
     },
+    [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD] = {
+        .instance_size = sizeof(BlockDirtyBitmapState),
+        .prepare = block_dirty_bitmap_add_prepare,
+        .abort = block_dirty_bitmap_add_abort,
+    },
+    [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR] = {
+        .instance_size = sizeof(BlockDirtyBitmapState),
+        .prepare = block_dirty_bitmap_clear_prepare,
+        .commit = block_dirty_bitmap_clear_commit,
+        .clean = block_dirty_bitmap_clear_clean,
+    }
 };
 
 /*
diff --git a/docs/bitmaps.md b/docs/bitmaps.md
index f066b48..402dd98 100644
--- a/docs/bitmaps.md
+++ b/docs/bitmaps.md
@@ -97,7 +97,7 @@ which is included at the end of this document.
 }
 ```
 
-## Transactions (Not yet implemented)
+## Transactions
 
 * Transactional commands are forthcoming in a future version,
   and are not yet available for use. This section serves as
diff --git a/qapi-schema.json b/qapi-schema.json
index ac9594d..f6fe2b3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1356,6 +1356,8 @@
 # abort since 1.6
 # blockdev-snapshot-internal-sync since 1.7
 # blockdev-backup since 2.3
+# block-dirty-bitmap-add since 2.4
+# block-dirty-bitmap-clear since 2.4
 ##
 { 'union': 'TransactionAction',
   'data': {
@@ -1363,7 +1365,9 @@
        'drive-backup': 'DriveBackup',
        'blockdev-backup': 'BlockdevBackup',
        'abort': 'Abort',
-       'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal'
+       'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',
+       'block-dirty-bitmap-add': 'BlockDirtyBitmapAdd',
+       'block-dirty-bitmap-clear': 'BlockDirtyBitmap'
    } }
 
 ##
-- 
2.1.0