From: Junyan He <junyan...@intel.com> Signed-off-by: Junyan He <junyan...@intel.com> --- block/snapshot.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/block/snapshot.h | 7 +++++++ 2 files changed, 52 insertions(+)
diff --git a/block/snapshot.c b/block/snapshot.c index eacc1f1..8cc40ac 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -401,6 +401,51 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, return ret; } +int bdrv_snapshot_save_dependency(BlockDriverState *bs, + const char *depend_snapshot_id, + int64_t depend_offset, + int64_t depend_size, + int64_t offset, + Error **errp) +{ + BlockDriver *drv = bs->drv; + + if (!drv) { + return -ENOMEDIUM; + } + + if (drv->bdrv_snapshot_save_dependency) { + return drv->bdrv_snapshot_save_dependency(bs, depend_snapshot_id, + depend_offset, depend_size, + offset, errp); + } + + if (bs->file) { + return bdrv_snapshot_save_dependency(bs->file->bs, depend_snapshot_id, + depend_offset, depend_size, + offset, errp); + } + + return -ENOTSUP; +} + +int bdrv_snapshot_support_dependency(BlockDriverState *bs, int32_t *alignment) +{ + BlockDriver *drv = bs->drv; + if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { + return 0; + } + + if (drv->bdrv_snapshot_support_dependency) { + return drv->bdrv_snapshot_support_dependency(bs, alignment); + } + + if (bs->file != NULL) { + return bdrv_snapshot_support_dependency(bs->file->bs, alignment); + } + + return -ENOTSUP; +} /* Group operations. All block drivers are involved. * These functions will properly handle dataplane (take aio_context_acquire diff --git a/include/block/snapshot.h b/include/block/snapshot.h index f73d109..e5bf06f 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -73,6 +73,13 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs, int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, const char *id_or_name, Error **errp); +int bdrv_snapshot_save_dependency(BlockDriverState *bs, + const char *depend_snapshot_id, + int64_t depend_offset, + int64_t depend_size, + int64_t offset, + Error **errp); +int bdrv_snapshot_support_dependency(BlockDriverState *bs, int32_t *alignment); /* Group operations. All block drivers are involved. -- 2.7.4