[Qemu-devel] [RFC PATCH 02/10] block: add a function to set incoming live migration

["Benoît Canet" <benoit.canet@gmail.com>]

This function will help to inform the block layer that an incoming
live migration is coming in order to make proper usage of the
BDRV_O_INCOMING flag.

Signed-off-by: Benoit Canet <benoit.canet@gmail.com>
---
 block.c |    8 ++++++++
 block.h |    2 ++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/block.c b/block.c
index 52ffe14..3e2260d 100644
--- a/block.c
+++ b/block.c
@@ -100,6 +100,8 @@ static BlockDriverState *bs_snapshots;
 /* If non-zero, use only whitelisted block drivers */
 static int use_bdrv_whitelist;
 
+static bool incoming_migration;
+
 #ifdef _WIN32
 static int is_windows_drive_prefix(const char *filename)
 {
@@ -3580,6 +3582,12 @@ void bdrv_invalidate_cache_all(void)
     }
 }
 
+void bdrv_set_incoming_migration(void)
+{
+    assert(incoming_migration == false);
+    incoming_migration = true;
+}
+
 int bdrv_flush(BlockDriverState *bs)
 {
     Coroutine *co;
diff --git a/block.h b/block.h
index e320d8f..23af1cc 100644
--- a/block.h
+++ b/block.h
@@ -223,6 +223,8 @@ BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
 void bdrv_invalidate_cache(BlockDriverState *bs);
 void bdrv_invalidate_cache_all(void);
 
+void bdrv_set_incoming_migration(void);
+
 /* Ensure contents are flushed to disk.  */
 int bdrv_flush(BlockDriverState *bs);
 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
-- 
1.7.7.6