diff options
Diffstat (limited to 'include/block/block_int-common.h')
| -rw-r--r-- | include/block/block_int-common.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 5a04c77..4ba04d0 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -598,6 +598,24 @@ struct BlockDriver { int64_t *map, BlockDriverState **file); /* + * Snapshot-access API. + * + * Block-driver may provide snapshot-access API: special functions to access + * some internal "snapshot". The functions are similar with normal + * read/block_status/discard handler, but don't have any specific handling + * in generic block-layer: no serializing, no alignment, no tracked + * requests. So, block-driver that realizes these APIs is fully responsible + * for synchronization between snapshot-access API and normal IO requests. + */ + int coroutine_fn (*bdrv_co_preadv_snapshot)(BlockDriverState *bs, + int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset); + int coroutine_fn (*bdrv_co_snapshot_block_status)(BlockDriverState *bs, + bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum, + int64_t *map, BlockDriverState **file); + int coroutine_fn (*bdrv_co_pdiscard_snapshot)(BlockDriverState *bs, + int64_t offset, int64_t bytes); + + /* * Invalidate any cached meta-data. */ void coroutine_fn (*bdrv_co_invalidate_cache)(BlockDriverState *bs, |