[Qemu-devel] [RFC PATCH 08/16] qmp: Add optional parameter "persistent" in block-dirty-bitmap-add

[Fam Zheng <famz@redhat.com>]

When omitted it defaults to false with unchanged behavior.

When set to true, the created dirty bitmap is made persistent if supported, it
requires support from the active image format. Otherwise an error is returned.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 blockdev.c           | 8 +++++++-
 qapi/block-core.json | 6 +++++-
 qmp-commands.hx      | 3 ++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 07cfe25..08236f2 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1997,6 +1997,7 @@ static void block_dirty_bitmap_add_prepare(BlkActionState *common,
     /* AIO context taken and released within qmp_block_dirty_bitmap_add */
     qmp_block_dirty_bitmap_add(action->node, action->name,
                                action->has_granularity, action->granularity,
+                               action->has_persistent, action->persistent,
                                &local_err);
 
     if (!local_err) {
@@ -2640,10 +2641,12 @@ out:
 
 void qmp_block_dirty_bitmap_add(const char *node, const char *name,
                                 bool has_granularity, uint32_t granularity,
+                                bool has_persistent, bool persistent,
                                 Error **errp)
 {
     AioContext *aio_context;
     BlockDriverState *bs;
+    BdrvDirtyBitmap *bitmap;
 
     if (!name || name[0] == '\0') {
         error_setg(errp, "Bitmap name cannot be empty");
@@ -2669,7 +2672,10 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name,
         granularity = bdrv_get_default_bitmap_granularity(bs);
     }
 
-    bdrv_create_dirty_bitmap(bs, granularity, name, errp);
+    bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp);
+    if (bitmap && has_persistent && persistent) {
+        bdrv_dirty_bitmap_set_persistent(bs, bitmap, true, false, errp);
+    }
 
  out:
     aio_context_release(aio_context);
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 30c2e5f..0ac107c 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1162,10 +1162,14 @@
 # @granularity: #optional the bitmap granularity, default is 64k for
 #               block-dirty-bitmap-add
 #
+# @persistent: #optinal whether to make the bitmap persistent, default is false.
+#              (Since 2.6)
+#
 # Since 2.4
 ##
 { 'struct': 'BlockDirtyBitmapAdd',
-  'data': { 'node': 'str', 'name': 'str', '*granularity': 'uint32' } }
+  'data': { 'node': 'str', 'name': 'str', '*granularity': 'uint32',
+            '*persistent': 'bool' } }
 
 ##
 # @block-dirty-bitmap-add
diff --git a/qmp-commands.hx b/qmp-commands.hx
index db072a6..bd4428e 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1373,7 +1373,7 @@ EQMP
 
     {
         .name       = "block-dirty-bitmap-add",
-        .args_type  = "node:B,name:s,granularity:i?",
+        .args_type  = "node:B,name:s,granularity:i?,persistent:b?",
         .mhandler.cmd_new = qmp_marshal_block_dirty_bitmap_add,
     },
 
@@ -1390,6 +1390,7 @@ Arguments:
 - "node": device/node on which to create dirty bitmap (json-string)
 - "name": name of the new dirty bitmap (json-string)
 - "granularity": granularity to track writes with (int, optional)
+- "persistent": whether the bitmap is persistent (bool, optional, default to no)
 
 Example:
 
-- 
2.4.3