[Qemu-devel] [PATCH v3 2/2] qapi: Change BlockDirtyInfo to list

[Fam Zheng <famz@redhat.com>]

We have multiple dirty bitmaps in BDS now, switch QAPI to allow query
it (BlockInfo.dirty_bitmaps), and also drop old BlockInfo.dirty.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block.c               | 20 ++++++++++++++++++++
 block/qapi.c          |  5 +++++
 include/block/block.h |  1 +
 qapi-schema.json      |  6 +++---
 4 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/block.c b/block.c
index ef7a55f..f57ae83 100644
--- a/block.c
+++ b/block.c
@@ -4379,6 +4379,26 @@ void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap)
     }
 }
 
+BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
+{
+    BdrvDirtyBitmap *bm;
+    BlockDirtyInfoList *list = NULL;
+    BlockDirtyInfoList **plist = &list;
+
+    QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) {
+        BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo));
+        BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList));
+        info->count = bdrv_get_dirty_count(bs, bm);
+        info->granularity =
+            ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap));
+        entry->value = info;
+        *plist = entry;
+        plist = &entry->next;
+    }
+
+    return list;
+}
+
 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector)
 {
     if (bitmap) {
diff --git a/block/qapi.c b/block/qapi.c
index 6b0cdcf..a32cb79 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -204,6 +204,11 @@ void bdrv_query_info(BlockDriverState *bs,
         info->io_status = bs->iostatus;
     }
 
+    if (!QLIST_EMPTY(&bs->dirty_bitmaps)) {
+        info->has_dirty_bitmaps = true;
+        info->dirty_bitmaps = bdrv_query_dirty_bitmaps(bs);
+    }
+
     if (bs->drv) {
         info->has_inserted = true;
         info->inserted = g_malloc0(sizeof(*info->inserted));
diff --git a/include/block/block.h b/include/block/block.h
index 06f424c..00f2711 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -391,6 +391,7 @@ struct HBitmapIter;
 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap;
 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity);
 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
+BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs);
 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector);
 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
diff --git a/qapi-schema.json b/qapi-schema.json
index 81a375b..931d710 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -948,8 +948,8 @@
 # @tray_open: #optional True if the device has a tray and it is open
 #             (only present if removable is true)
 #
-# @dirty: #optional dirty bitmap information (only present if the dirty
-#         bitmap is enabled)
+# @dirty-bitmaps: #optional dirty bitmaps information (only present if the
+#                 driver has one or more dirty bitmaps)
 #
 # @io-status: #optional @BlockDeviceIoStatus. Only present if the device
 #             supports it and the VM is configured to stop on errors
@@ -963,7 +963,7 @@
   'data': {'device': 'str', 'type': 'str', 'removable': 'bool',
            'locked': 'bool', '*inserted': 'BlockDeviceInfo',
            '*tray_open': 'bool', '*io-status': 'BlockDeviceIoStatus',
-           '*dirty': 'BlockDirtyInfo' } }
+           '*dirty-bitmaps': ['BlockDirtyInfo'] } }
 
 ##
 # @query-block:
-- 
1.8.4.2