block/block-backend: add blk_co_pwritev_part

Add blk write function with qiov_offset parameter. It's needed for the
following commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Reviewed-by: Max Reitz <[email protected]>
Message-id: 20191011090711[email protected]
Signed-off-by: Max Reitz <[email protected]>

diff --git a/block/block-backend.c b/block/block-backend.c
index eb22ff306e90008d74f1eda5598b74df99c620d3..912c50678d092e0a52b3a39b4fc7edd1e011598c 100644 (file)
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1178,9 +1178,10 @@ int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
     return ret;
 }
 
-int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
-                                unsigned int bytes, QEMUIOVector *qiov,
-                                BdrvRequestFlags flags)
+int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset,
+                                     unsigned int bytes,
+                                     QEMUIOVector *qiov, size_t qiov_offset,
+                                     BdrvRequestFlags flags)
 {
     int ret;
     BlockDriverState *bs;
@@ -1207,11 +1208,19 @@ int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
         flags |= BDRV_REQ_FUA;
     }
 
-    ret = bdrv_co_pwritev(blk->root, offset, bytes, qiov, flags);
+    ret = bdrv_co_pwritev_part(blk->root, offset, bytes, qiov, qiov_offset,
+                               flags);
     bdrv_dec_in_flight(bs);
     return ret;
 }
 
+int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
+                                unsigned int bytes, QEMUIOVector *qiov,
+                                BdrvRequestFlags flags)
+{
+    return blk_co_pwritev_part(blk, offset, bytes, qiov, 0, flags);
+}
+
 typedef struct BlkRwCo {
     BlockBackend *blk;
     int64_t offset;

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 368d53af77cd32fe2b336b26ab9a31f41f9c6b90..73f2cef7fecce7005b9e44c01831727caffc74ac 100644 (file)
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -121,6 +121,10 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
 int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
                                unsigned int bytes, QEMUIOVector *qiov,
                                BdrvRequestFlags flags);
+int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset,
+                                     unsigned int bytes,
+                                     QEMUIOVector *qiov, size_t qiov_offset,
+                                     BdrvRequestFlags flags);
 int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
                                unsigned int bytes, QEMUIOVector *qiov,
                                BdrvRequestFlags flags);