[Qemu-devel] [PATCH 04/10] block/json: Add functions for writing zeroes etc.

[Max Reitz]

Add passthrough functions for bdrv_aio_discard(),
bdrv_co_write_zeroes(), bdrv_truncate() and bdrv_has_zero_init().

Signed-off-by: Max Reitz <mre...@redhat.com>
---
 block/json.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/block/json.c b/block/json.c
index 2f885cc..a2f4691 100644
--- a/block/json.c
+++ b/block/json.c
@@ -98,6 +98,21 @@ static BlockDriverAIOCB *json_aio_flush(BlockDriverState *bs,
     return bdrv_aio_flush(bs->file, cb, opaque);
 }
 
+static BlockDriverAIOCB *json_aio_discard(BlockDriverState *bs,
+                                          int64_t sector_num, int nb_sectors,
+                                          BlockDriverCompletionFunc *cb,
+                                          void *opaque)
+{
+    return bdrv_aio_discard(bs, sector_num, nb_sectors, cb, opaque);
+}
+
+static coroutine_fn int json_co_write_zeroes(BlockDriverState *bs,
+                                             int64_t sector_num, int 
nb_sectors,
+                                             BdrvRequestFlags flags)
+{
+    return bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags);
+}
+
 static void json_invalidate_cache(BlockDriverState *bs)
 {
     return bdrv_invalidate_cache(bs->file);
@@ -108,6 +123,16 @@ static int64_t json_getlength(BlockDriverState *bs)
     return bdrv_getlength(bs->file);
 }
 
+static int json_truncate(BlockDriverState *bs, int64_t offset)
+{
+    return bdrv_truncate(bs->file, offset);
+}
+
+static int json_has_zero_init(BlockDriverState *bs)
+{
+    return bdrv_has_zero_init(bs->file);
+}
+
 static int json_refresh_limits(BlockDriverState *bs)
 {
     bs->bl = bs->file->bl;
@@ -131,12 +156,17 @@ static BlockDriver bdrv_json = {
     .bdrv_aio_readv             = json_aio_readv,
     .bdrv_aio_writev            = json_aio_writev,
     .bdrv_aio_flush             = json_aio_flush,
+    .bdrv_aio_discard           = json_aio_discard,
+
+    .bdrv_co_write_zeroes       = json_co_write_zeroes,
 
     .bdrv_invalidate_cache      = json_invalidate_cache,
 
     .has_variable_length        = true,
     .bdrv_getlength             = json_getlength,
+    .bdrv_truncate              = json_truncate,
 
+    .bdrv_has_zero_init         = json_has_zero_init,
     .bdrv_refresh_limits        = json_refresh_limits,
     .bdrv_get_info              = json_get_info,
 
-- 
1.9.0