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[Qemu-devel] [PATCH 5/6] block: Add backing passthrough implementations
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH 5/6] block: Add backing passthrough implementations for copy_range |
Date: |
Fri, 8 Jun 2018 14:04:16 +0800 |
Similar to bdrv_co_block_status_from_backing we add the two passthrough
callbacks for copy_range. This will be used by the block driver filters
so that they can support copy offloading.
Signed-off-by: Fam Zheng <address@hidden>
---
block/io.c | 24 ++++++++++++++++++++++++
include/block/block_int.h | 22 ++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/block/io.c b/block/io.c
index d8039793c2..d1559c9cd5 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1900,6 +1900,30 @@ int coroutine_fn
bdrv_co_block_status_from_backing(BlockDriverState *bs,
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
+int coroutine_fn bdrv_co_copy_range_from_backing(BlockDriverState *bs,
+ BdrvChild *src, uint64_t
src_offset,
+ BdrvChild *dst, uint64_t
dst_offset,
+ uint64_t bytes,
BdrvRequestFlags flags)
+{
+ if (!src->bs) {
+ return -ENOMEDIUM;
+ }
+ return bdrv_co_copy_range_from(src->bs->backing, src_offset, dst,
+ dst_offset, bytes, flags);
+}
+
+int coroutine_fn bdrv_co_copy_range_to_backing(BlockDriverState *bs,
+ BdrvChild *src, uint64_t
src_offset,
+ BdrvChild *dst, uint64_t
dst_offset,
+ uint64_t bytes,
BdrvRequestFlags flags)
+{
+ if (!dst->bs) {
+ return -ENOMEDIUM;
+ }
+ return bdrv_co_copy_range_to(src, src_offset, dst->bs->backing,
+ dst_offset, bytes, flags);
+}
+
/*
* Returns the allocation status of the specified sectors.
* Drivers not implementing the functionality are assumed to not support
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 2c51cd420f..b488d74c1b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1118,6 +1118,28 @@ int coroutine_fn
bdrv_co_block_status_from_backing(BlockDriverState *bs,
int64_t *pnum,
int64_t *map,
BlockDriverState **file);
+
+/*
+ * Default implementation for drivers to pass bdrv_co_copy_range_from() to
+ * their backing file.
+ */
+int coroutine_fn bdrv_co_copy_range_from_backing(BlockDriverState *bs,
+ BdrvChild *src, uint64_t
src_offset,
+ BdrvChild *dst, uint64_t
dst_offset,
+ uint64_t bytes,
+ BdrvRequestFlags flags);
+
+
+/*
+ * Default implementation for drivers to pass bdrv_co_copy_range_to() to their
+ * backing file.
+ */
+int coroutine_fn bdrv_co_copy_range_to_backing(BlockDriverState *bs,
+ BdrvChild *src, uint64_t
src_offset,
+ BdrvChild *dst, uint64_t
dst_offset,
+ uint64_t bytes,
+ BdrvRequestFlags flags);
+
const char *bdrv_get_parent_name(const BlockDriverState *bs);
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp);
bool blk_dev_has_removable_media(BlockBackend *blk);
--
2.17.0
- [Qemu-devel] [PATCH 0/6] mirror: Use copy offloading, Fam Zheng, 2018/06/08
- [Qemu-devel] [PATCH 1/6] file-posix: Fix EINTR handling, Fam Zheng, 2018/06/08
- [Qemu-devel] [PATCH 2/6] block: Check if block drivers can do copy offloading, Fam Zheng, 2018/06/08
- [Qemu-devel] [PATCH 4/6] block-backend: Add blk_aio_copy_range, Fam Zheng, 2018/06/08
- [Qemu-devel] [PATCH 3/6] block-backend: Refactor AIO emulation, Fam Zheng, 2018/06/08
- [Qemu-devel] [PATCH 5/6] block: Add backing passthrough implementations for copy_range,
Fam Zheng <=
- [Qemu-devel] [PATCH 6/6] mirror: Use copy offloading, Fam Zheng, 2018/06/08