diff mbox series

[v2,3/5] block/block-backend: add blk_co_pwritev_part

Message ID 20191011090711.19940-4-vsementsov@virtuozzo.com (mailing list archive)
State New, archived
Headers show
Series active-mirror: support unaligned guest operations | expand

Commit Message

Vladimir Sementsov-Ogievskiy Oct. 11, 2019, 9:07 a.m. UTC 
Add blk write function with qiov_offset parameter. It's needed for the
following commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 include/sysemu/block-backend.h |  4 ++++
 block/block-backend.c          | 17 +++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 368d53af77..73f2cef7fe 100644
--- 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);
diff --git a/block/block-backend.c b/block/block-backend.c
index 1c605d5444..b3d00478af 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1176,9 +1176,10 @@  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;
@@ -1205,11 +1206,19 @@  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;