[Qemu-devel] [PATCH 2/3] block: complete all IOs before resizing a device

[Peter Lieven <pl@dlhnet.de>]

this patch ensures that all pending IOs are completed
before a device is resized. this is especially important
if a device is shrinked as it the bdrv_check_request()
result is invalidated.

Signed-off-by: Peter Lieven <pl@kamp.de>
---
  blockdev.c |    3 +++
  1 file changed, 3 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index 0e67d06..be36ed7 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1062,6 +1062,9 @@ void qmp_block_resize(const char *device, int64_t size, Error **errp)
          return;
      }

+    /* complete all in-flight operations before resizing the device */
+    bdrv_drain_all();
+
      switch (bdrv_truncate(bs, size)) {
      case 0:
          break;
-- 
1.7.9.5