diff options
| -rw-r--r-- | block/dirty-bitmap.c | 18 | ||||
| -rw-r--r-- | blockdev.c | 30 | ||||
| -rw-r--r-- | include/block/dirty-bitmap.h | 3 | ||||
| -rw-r--r-- | qapi/block-core.json | 38 |
4 files changed, 88 insertions, 1 deletions
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index 59b38b2671..383d742cdb 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -728,3 +728,21 @@ int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, uint64_t offset) { return hbitmap_next_zero(bitmap->bitmap, offset); } + +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 2ac15601d9..dcb7a6d54e 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3043,6 +3043,36 @@ void qmp_x_block_dirty_bitmap_disable(const char *node, const char *name, bdrv_disable_dirty_bitmap(bitmap); } +void qmp_x_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) { + 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) diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h index 5a51a78b63..02e0cbabd2 100644 --- a/include/block/dirty-bitmap.h +++ b/include/block/dirty-bitmap.h @@ -69,7 +69,8 @@ void bdrv_dirty_bitmap_set_readonly(BdrvDirtyBitmap *bitmap, bool value); void bdrv_dirty_bitmap_set_persistance(BdrvDirtyBitmap *bitmap, bool persistent); void bdrv_dirty_bitmap_set_qmp_locked(BdrvDirtyBitmap *bitmap, bool qmp_locked); - +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/qapi/block-core.json b/qapi/block-core.json index 02de674f5f..9d4ab93190 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1741,6 +1741,20 @@ '*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: 3.0 +## +{ '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. @@ -1851,6 +1865,30 @@ 'data': 'BlockDirtyBitmap' } ## +# @x-block-dirty-bitmap-merge: +# +# Merge @src_name dirty bitmap to @dst_name dirty bitmap. @src_name dirty +# bitmap is unchanged. On error, @dst_name 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: 3.0 +# +# Example: +# +# -> { "execute": "x-block-dirty-bitmap-merge", +# "arguments": { "node": "drive0", "dst_name": "bitmap0", +# "src_name": "bitmap1" } } +# <- { "return": {} } +# +## + { 'command': 'x-block-dirty-bitmap-merge', + 'data': 'BlockDirtyBitmapMerge' } + +## # @BlockDirtyBitmapSha256: # # SHA256 hash of dirty bitmap data |