[Qemu-devel] [PATCH 01/10] RFC: Add save and support snapshot dependency function to block driver.

[junyan . he]

From: Junyan He 

We want to support incremental snapshot saving, this needs the file
system support dependency saving. Later snapshots may ref the dependent
snapshot's content, and most time should be cluster aligned.
Add a query function to check whether the file system support this, and
use the save_dependency function to do the real work.

Signed-off-by: Junyan He 
---
 include/block/block_int.h | 9 +
 1 file changed, 9 insertions(+)

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 64a5700..be1eca3 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -274,6 +274,15 @@ struct BlockDriver {
   const char *snapshot_id,
   const char *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);
+
 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
 
-- 
2.7.4

[Qemu-devel] [PATCH 01/10] RFC: Add save and support snapshot dependency function to block driver.

[junyan . he]

From: Junyan He 

We want to support incremental snapshot saving, this needs the file
system support dependency saving. Later snapshots may ref the dependent
snapshot's content, and most time should be cluster aligned.
Add a query function to check whether the file system support this, and
use the save_dependency function to do the real work.

Signed-off-by: Junyan He 
---
 include/block/block_int.h | 9 +
 1 file changed, 9 insertions(+)

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 64a5700..be1eca3 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -274,6 +274,15 @@ struct BlockDriver {
   const char *snapshot_id,
   const char *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);
+
 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
 
-- 
2.7.4