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[Qemu-block] [RFC PATCH 09/16] qmp: Add block-dirty-bitmap-set-persisten


From: Fam Zheng
Subject: [Qemu-block] [RFC PATCH 09/16] qmp: Add block-dirty-bitmap-set-persistent
Date: Tue, 26 Jan 2016 18:38:18 +0800

Signed-off-by: Fam Zheng <address@hidden>
---
 blockdev.c           | 20 ++++++++++++++++++++
 qapi/block-core.json | 22 ++++++++++++++++++++++
 qmp-commands.hx      | 31 +++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index 08236f2..a9d6617 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2699,6 +2699,9 @@ void qmp_block_dirty_bitmap_remove(const char *node, 
const char *name,
                    name);
         goto out;
     }
+    if (bdrv_dirty_bitmap_set_persistent(bs, bitmap, false, false, errp)) {
+        goto out;
+    }
     bdrv_dirty_bitmap_make_anon(bitmap);
     bdrv_release_dirty_bitmap(bs, bitmap);
 
@@ -2740,6 +2743,23 @@ void qmp_block_dirty_bitmap_clear(const char *node, 
const char *name,
     aio_context_release(aio_context);
 }
 
+void qmp_block_dirty_bitmap_set_persistent(const char *node, const char *name,
+                                           bool persistent, Error **errp)
+{
+    AioContext *aio_context;
+    BdrvDirtyBitmap *bitmap;
+    BlockDriverState *bs;
+
+    bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
+    if (!bitmap || !bs) {
+        return;
+    }
+
+    bdrv_dirty_bitmap_set_persistent(bs, bitmap, persistent, false, errp);
+
+    aio_context_release(aio_context);
+}
+
 void hmp_drive_del(Monitor *mon, const QDict *qdict)
 {
     const char *id = qdict_get_str(qdict, "id");
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 0ac107c..52689ed 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1263,6 +1263,28 @@
             '*on-target-error': 'BlockdevOnError' } }
 
 ##
+# @block-dirty-bitmap-set-persistent
+#
+# Update a dirty bitmap's persistent state on the device
+#
+# @node: name of device/node which the bitmap is tracking
+#
+# @name: name of the dirty bitmap
+#
+# @persistent: #optinal whether to make the bitmap persistent, default is false
+#
+# Returns: nothing on success
+#          If @node is not a valid block device, DeviceNotFound
+#          If @name is not found, GenericError with an explanation
+#          If an error happens when setting the persistent state, GenericError
+#          with an explanation
+#
+# Since 2.6
+##
+{ 'command': 'block-dirty-bitmap-set-persistent',
+  'data': { 'node': 'str', 'name': 'str', 'persistent': 'bool' } }
+
+##
 # @block_set_io_throttle:
 #
 # Change I/O throttle limits for a block drive.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index bd4428e..e37cf09 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1458,6 +1458,37 @@ Example:
 EQMP
 
     {
+        .name       = "block-dirty-bitmap-set-persistent",
+        .args_type  = "node:B,name:s,persistent:b",
+        .mhandler.cmd_new = qmp_marshal_block_dirty_bitmap_set_persistent,
+    },
+
+SQMP
+
+block-dirty-bitmap-set-persistent
+---------------------------------
+Since 2.6
+
+Update the persistent state of a dirty bitmap. Format driver support is
+required.
+
+Arguments:
+
+- "node": device/node on which to update the dirty bitmap (json-string)
+- "name": name of the dirty bitmap to update (json-string)
+- "persistent": the state to update to. (json-bool)
+
+Example:
+
+-> { "execute": "block-dirty-bitmap-set-persistent",
+                "arguments": { "node": "drive0",
+                               "name": "bitmap0",
+                               "persistent": true } }
+<- { "return": {} }
+
+EQMP
+
+    {
         .name       = "blockdev-snapshot-sync",
         .args_type  = 
"device:s?,node-name:s?,snapshot-file:s,snapshot-node-name:s?,format:s?,mode:s?",
         .mhandler.cmd_new = qmp_marshal_blockdev_snapshot_sync,
-- 
2.4.3




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