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[Qemu-devel] [PATCH v2 5/6] qapi: add block-dirty-bitmap-merge
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH v2 5/6] qapi: add block-dirty-bitmap-merge |
Date: |
Tue, 16 Jan 2018 15:54:26 +0300 |
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
qapi/block-core.json | 38 ++++++++++++++++++++++++++++++++++++++
include/block/dirty-bitmap.h | 2 ++
block/dirty-bitmap.c | 18 ++++++++++++++++++
blockdev.c | 30 ++++++++++++++++++++++++++++++
4 files changed, 88 insertions(+)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index b3851ee760..9f9cfa0a44 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1604,6 +1604,20 @@
'*persistent': 'bool', '*autoload': 'bool' } }
##
+# @BlockDirtyBitmapMerge:
+#
+# @node: name of device/node which the bitmap is tracking
+#
+# @dst_name: name of the destination dirty bitmap
+#
+# @src_name: name of the source dirty bitmap
+#
+# Since: 2.12
+##
+{ 'struct': 'BlockDirtyBitmapMerge',
+ 'data': { 'node': 'str', 'dst_name': 'str', 'src_name': 'str' } }
+
+##
# @block-dirty-bitmap-add:
#
# Create a dirty bitmap with a name on the node, and start tracking the writes.
@@ -1714,6 +1728,30 @@
'data': 'BlockDirtyBitmap' }
##
+# @block-dirty-bitmap-merge:
+#
+# Merge @src_name dirty bitmap to @dst_name dirty bitmap. @src_name dirty
+# bitmap is unchanged.
+#
+# Returns: nothing on success
+# If @node is not a valid block device, DeviceNotFound
+# If @dst_name or @src_name is not found, GenericError
+# If bitmaps has different sizes or granularities, GenericError
+#
+# Since: 2.12
+#
+# Example:
+#
+# -> { "execute": "block-dirty-bitmap-merge",
+# "arguments": { "node": "drive0", "dst_name": "bitmap0",
+# "src_name": "bitmap1" } }
+# <- { "return": {} }
+#
+##
+ { 'command': 'block-dirty-bitmap-merge',
+ 'data': 'BlockDirtyBitmapMerge' }
+
+##
# @BlockDirtyBitmapSha256:
#
# SHA256 hash of dirty bitmap data
diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index 144e77a879..92a1041368 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -67,6 +67,8 @@ void bdrv_dirty_bitmap_deserialize_finish(BdrvDirtyBitmap
*bitmap);
void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value);
void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap,
bool persistent);
+void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src,
+ Error **errp);
/* Functions that require manual locking. */
void bdrv_dirty_bitmap_lock(BdrvDirtyBitmap *bitmap);
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index d0a10c4f5d..afcb3f541e 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -699,3 +699,21 @@ char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap
*bitmap, Error **errp)
{
return hbitmap_sha256(bitmap->bitmap, errp);
}
+
+void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const BdrvDirtyBitmap *src,
+ Error **errp)
+{
+ /* only bitmaps from one bds are supported */
+ assert(dest->mutex == src->mutex);
+
+ qemu_mutex_lock(dest->mutex);
+
+ assert(bdrv_dirty_bitmap_enabled(dest));
+ assert(!bdrv_dirty_bitmap_readonly(dest));
+
+ if (!hbitmap_merge(dest->bitmap, src->bitmap)) {
+ error_setg(errp, "Bitmaps are incompatible and can't be merged");
+ }
+
+ qemu_mutex_unlock(dest->mutex);
+}
diff --git a/blockdev.c b/blockdev.c
index d338363d78..1650c31c87 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2942,6 +2942,36 @@ void qmp_block_dirty_bitmap_disable(const char *node,
const char *name,
bdrv_disable_dirty_bitmap(bitmap);
}
+void qmp_block_dirty_bitmap_merge(const char *node, const char *dst_name,
+ const char *src_name, Error **errp)
+{
+ BlockDriverState *bs;
+ BdrvDirtyBitmap *dst, *src;
+
+ dst = block_dirty_bitmap_lookup(node, dst_name, &bs, errp);
+ if (!dst || !bs) {
+ return;
+ }
+
+ if (bdrv_dirty_bitmap_frozen(dst)) {
+ error_setg(errp, "Bitmap '%s' is frozen and cannot be modified",
+ dst_name);
+ return;
+ } else if (bdrv_dirty_bitmap_readonly(dst)) {
+ error_setg(errp, "Bitmap '%s' is readonly and cannot be modified",
+ dst_name);
+ return;
+ }
+
+ src = bdrv_find_dirty_bitmap(bs, src_name);
+ if (!src) {
+ error_setg(errp, "Dirty bitmap '%s' not found", src_name);
+ return;
+ }
+
+ bdrv_merge_dirty_bitmap(dst, src, errp);
+}
+
BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
const char *name,
Error **errp)
--
2.11.1
[Qemu-devel] [PATCH v2 1/6] block: maintain persistent disabled bitmaps, Vladimir Sementsov-Ogievskiy, 2018/01/16