diff options
Diffstat (limited to 'include/block/block_int.h')
| -rw-r--r-- | include/block/block_int.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h index 16c43e224e..688c6be009 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -509,6 +509,20 @@ struct BlockBackendRootState { BlockdevDetectZeroesOptions detect_zeroes; }; +typedef enum BlockMirrorBackingMode { + /* Reuse the existing backing chain from the source for the target. + * - sync=full: Set backing BDS to NULL. + * - sync=top: Use source's backing BDS. + * - sync=none: Use source as the backing BDS. */ + MIRROR_SOURCE_BACKING_CHAIN, + + /* Open the target's backing chain completely anew */ + MIRROR_OPEN_BACKING_CHAIN, + + /* Do not change the target's backing BDS after job completion */ + MIRROR_LEAVE_BACKING_CHAIN, +} BlockMirrorBackingMode; + static inline BlockDriverState *backing_bs(BlockDriverState *bs) { return bs->backing ? bs->backing->bs : NULL; @@ -671,6 +685,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base, * @granularity: The chosen granularity for the dirty bitmap. * @buf_size: The amount of data that can be in flight at one time. * @mode: Whether to collapse all images in the chain to the target. + * @backing_mode: How to establish the target's backing chain after completion. * @on_source_error: The action to take upon error reading from the source. * @on_target_error: The action to take upon error writing to the target. * @unmap: Whether to unmap target where source sectors only contain zeroes. @@ -686,7 +701,8 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base, void mirror_start(BlockDriverState *bs, BlockDriverState *target, const char *replaces, int64_t speed, uint32_t granularity, int64_t buf_size, - MirrorSyncMode mode, BlockdevOnError on_source_error, + MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, + BlockdevOnError on_source_error, BlockdevOnError on_target_error, bool unmap, BlockCompletionFunc *cb, |