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[Qemu-devel] [PULL 24/76] block/null: Support reopen


From: Kevin Wolf
Subject: [Qemu-devel] [PULL 24/76] block/null: Support reopen
Date: Tue, 28 Apr 2015 17:00:06 +0200

From: Fam Zheng <address@hidden>

Reopen is used in block-commit. With this always-succeed operation, it
is now possible to test committing to a null drive, by specifying
"null-aio://" or "null-co://" as the backing image when creating the
qcow2 image.

Signed-off-by: Fam Zheng <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Message-id: address@hidden
Signed-off-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 block/null.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/block/null.c b/block/null.c
index 267d3e6..7d08323 100644
--- a/block/null.c
+++ b/block/null.c
@@ -177,6 +177,12 @@ static BlockAIOCB *null_aio_flush(BlockDriverState *bs,
     return null_aio_common(bs, cb, opaque);
 }
 
+static int null_reopen_prepare(BDRVReopenState *reopen_state,
+                               BlockReopenQueue *queue, Error **errp)
+{
+    return 0;
+}
+
 static BlockDriver bdrv_null_co = {
     .format_name            = "null-co",
     .protocol_name          = "null-co",
@@ -189,6 +195,7 @@ static BlockDriver bdrv_null_co = {
     .bdrv_co_readv          = null_co_readv,
     .bdrv_co_writev         = null_co_writev,
     .bdrv_co_flush_to_disk  = null_co_flush,
+    .bdrv_reopen_prepare    = null_reopen_prepare,
 };
 
 static BlockDriver bdrv_null_aio = {
@@ -203,6 +210,7 @@ static BlockDriver bdrv_null_aio = {
     .bdrv_aio_readv         = null_aio_readv,
     .bdrv_aio_writev        = null_aio_writev,
     .bdrv_aio_flush         = null_aio_flush,
+    .bdrv_reopen_prepare    = null_reopen_prepare,
 };
 
 static void bdrv_null_init(void)
-- 
1.8.3.1




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